CN107123782A - Cell, battery modules, electrokinetic cell and electric automobile - Google Patents

Abstract

The invention discloses a single battery, a battery module, a power battery and an electric vehicle. The single battery includes a casing, an electric core, an electrode terminal, and a cover plate. The electrode terminal includes a pole that passes through the cover plate and is electrically connected with the electric core. The single battery also includes a current interruption device installed on the pole. The interrupting device is in gas communication with the interior of the casing, wherein the current interrupting device has a conductive member and a flipping member connected to the conductive member to be electrically connected to each other, and the flipping member and the conductive member can be electrically disconnected under the action of air pressure, wherein the conductive member is connected The poles are electrically connected to each other. The poles are installed on the ceramic ring that is sealed and connected to the cover plate, and the outer periphery of the pole has a radial boss, and the inner edge of the ceramic ring has a supporting connection to the radial boss. The radial support, the radial bosses are arranged at intervals along the circumferential direction, the radial supports are arranged at intervals along the circumferential direction, and the plurality of radial bosses correspond to the plurality of radial supports one by one.

Description

Single battery, battery module, power battery and electric vehicle

technical field

The present invention relates to the field of batteries, in particular to a single battery, a battery module including the single battery, a power battery including the battery module, and an electric vehicle including the power battery

Background technique

As an energy storage unit, batteries play an important role in all walks of life. For example, power batteries are widely used in new energy vehicles and other fields. The battery pack of the power battery can have multiple single batteries connected in series or in parallel to form a battery module. Realize the work of charging and discharging. Among them, during the charging and discharging process of the power battery, BMS (battery management system) is usually used to monitor the changes of voltage and current to calculate the state of charge. If there is a problem with the voltage sampling, it may lead to overcharging of the battery, especially for the ternary system, if the overcharging reaches a certain level, there will be a danger of battery combustion and explosion.

Existing technical solutions: monitor the voltage and current of the battery, calculate the battery power through the current integration method and the open circuit voltage method, and control the charge and discharge management of the battery. However, there are also deficiencies, such as battery voltage sampling or current sampling failure, or software failure, resulting in uncontrolled battery charging for a long time, especially in the case of charging piles, when the communication between the charging pile and the battery manager fails, overcharging Uncontrollable, the battery is overcharged to a certain extent, which will cause the battery to swell or even explode and catch fire.

Therefore, it is of positive significance to provide a current interruption technology that can be forcibly disconnected by itself.

Contents of the invention

The object of the present invention is to provide a single battery, the structure of which can be forcibly disconnected in case of danger so as to avoid dangers such as battery explosion.

The object of the present invention is also to provide a battery module using the single battery, a power battery using the battery module and an electric vehicle using the power battery.

In order to achieve the above object, the present invention provides a single battery, which includes a casing, an electric core contained in the casing, an electrode terminal electrically connected to the electric core, and a cover plate for encapsulating the casing. The terminal is arranged on the cover plate, the electrode terminal includes a pole that passes through the cover plate and is electrically connected with the battery core, and the single battery also includes a current interruption device installed on the pole , the current interrupting device communicates with the internal gas of the housing, wherein the current interrupting device has a conductive member and an inverting member connected to the conductive member to be electrically connected to each other, and the inverting member and the conductive member can be operated under air pressure The electrical connection is disconnected under the action, wherein the conductive member is connected to the pole to be electrically connected to each other, the pole is installed on the ceramic ring that is sealed and connected to the cover plate, and the outer surface of the pole There is a radial boss on the periphery of the end, and the inner edge of the ceramic ring has a radial support that supports and connects the radial boss. The radial bosses are arranged at intervals along the circumferential direction, and the radial support is A plurality of radial projections are arranged at intervals in the circumferential direction, and the plurality of radial bosses correspond to the plurality of radial supports one by one.

Optionally, there are three or four radial bosses arranged at equal intervals.

Optionally, an accommodating hole is formed on the outer end surface of the pole, and the outer peripheral edge of the conductive member is fixed on the inner wall of the accommodating hole.

Optionally, an air guide hole communicating with the inside of the casing and the current interruption device is formed on the pole, and the air guide hole includes an air guide hole connecting the receiving hole and the inside of the single battery.

Optionally, the flipping member is connected to the conductive member through a boss welding structure, and the boss welding structure includes a boss, a connection hole for accommodating the boss, and an annular welding spot between the boss and the connection hole .

Optionally, the turning member is formed as a first sheet structure on which the connecting hole is formed, and the conductive member is formed as a second sheet structure on which There are said bosses.

Optionally, a notch is formed on the conductive member, and the notch is arranged around the connection point for connecting the turning member.

Optionally, the notch is elliptical, the connection point is a circular connection point, and the center of circle of the notch and the center of circle of the connection point are staggered along the long axis of the ellipse.

Optionally, the outer end surface of the ceramic ring is formed into a stepped structure having an inner ring and an outer ring, and the pole is embedded and connected to the inner ring.

Optionally, a conductive ring is sealingly connected to the outer end surface of the ceramic ring, the outer peripheral edge of the flipping member is fixedly connected to the conductive ring, and the conductive ring is sealingly connected to the outer ring to be connected to the pole. Post insulation.

Optionally, a transition ring is sealingly connected to the inner end surface of the ceramic ring, and the transition ring is sealingly connected to the cover plate so that the ceramic ring is spaced apart from the cover plate.

Optionally, the transition ring has an inner ring and an outer ring forming a Z-shaped structure, the cover plate is formed with a through hole for the pole to pass through, the end surface of the through hole is a stepped structure, and the transition ring The inner ring is embedded and supported in the stepped structure.

Optionally, the outer end surface of the conductive ring is formed with an L-shaped notch, the outer peripheral edge of the flipping member is embedded and supported in the L-shaped notch, and the outer peripheral edge is sealed and connected to the flipping member by a cap covering the flipping member. On the L-shaped seam.

The present invention also provides a battery module, which includes the single battery provided by the present invention.

The present invention also provides a power battery, including a package body and a battery module arranged in the package body, and the battery module is the battery module provided by the present invention.

The present invention also provides an electric vehicle, which is provided with the power battery provided by the present invention.

Through the above technical solution, when the battery is in danger, gas will be generated in the battery, so as the air pressure rises, the flip piece can be flipped under the action of the air pressure passing through the gap between the ceramic ring and the pole to disconnect the conductive element. Connect, so as to disconnect the charge and discharge circuit of the power battery, and then prevent the battery pressure from continuing to increase and explode.

Other features and advantages of the present invention will be described in detail in the following detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a partially exploded perspective view of a power battery in the first embodiment of the present invention;

2 is a schematic top view of two adjacent single cells in the first embodiment of the present invention;

Fig. 3 is a schematic cross-sectional structure taken from line A-A in Fig. 2;

Fig. 4 is a schematic diagram of an exploded structure of the current interruption device in the first embodiment of the present invention;

Fig. 5 is a schematic diagram of an exploded structure of a turning member and a conductive member in the first embodiment of the present invention;

Fig. 6 is a schematic cross-sectional structural view of the assembly state of the turning member and the conductive member in the first embodiment of the present invention;

FIG. 7 is a schematic top view of the conductive member in the first embodiment of the present invention;

Fig. 8 is a schematic cross-sectional structure diagram of another embodiment of the pole in the implementation of the first embodiment of the present invention;

9 is a schematic perspective view of another embodiment of the pole in the first embodiment of the present invention;

Fig. 10 is a schematic cross-sectional structure diagram of another example of a pole and a ceramic ring in the first embodiment of the present invention;

Fig. 11 is a three-dimensional structural schematic diagram of another embodiment of a pole and a ceramic ring in the first embodiment of the present invention;

Fig. 12 is a schematic structural diagram of another example of two adjacent single cells in the first embodiment of the present invention;

Fig. 13 is a schematic perspective view of the three-dimensional structure of the power battery in the second embodiment of the present invention;

14 is a schematic perspective view of the three-dimensional structure of a single battery in the second embodiment of the present invention;

15 is a schematic diagram of an exploded three-dimensional structure of a single battery in the second embodiment of the present invention;

Fig. 16 is a schematic diagram of an exploded three-dimensional structure of the flipping member and the conductive member in the second embodiment of the present invention;

17 is a partial cross-sectional structural schematic diagram of a single battery in the second embodiment of the present invention;

18 is a partial cross-sectional structural schematic diagram of a single battery in the third embodiment of the present invention;

Fig. 19 is a functional block diagram of a control system provided in a preferred embodiment of the present invention;

Fig. 20 is a schematic diagram of an exploded structure of a single battery according to an embodiment of the present invention;

FIG. 21 is a partial cross-sectional structural schematic diagram of the single battery in FIG. 20 after assembly;

Fig. 22 is a partial cross-sectional structural schematic diagram of a single battery in the fourth embodiment of the present invention;

Fig. 23 is a schematic structural diagram of the current interruption device in the fourth embodiment of the present invention;

Fig. 24 is a partial cross-sectional structural schematic diagram of a single battery in the fifth embodiment of the present invention.

detailed description

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In the present invention, unless otherwise stated, the used orientation words such as "up, down, left, right" are usually defined based on the direction of the corresponding drawings, and "inner and outer" refer to Inside and outside of the corresponding part contour.

As shown in Figures 1 to 24, the present invention provides technical solutions for a current interruption device, a single battery, a battery module, a power battery and an electric vehicle. The current interruption device is arranged in the single battery, and multiple single batteries are connected in series or in parallel to form a battery module, and can be placed in a battery pack to form a power battery. In addition, in addition to the field of power batteries, various technical solutions provided in the present invention can also be widely used in other battery fields. Specifically, the present invention introduces the related single batteries 100, 1100, 2100, 3100, 4100 through the first to fifth embodiments, in which the current interruption devices 200, 1200, 3200, 4200 and explosion-proof valve 2200 are involved. In addition, the present invention also It relates to a power battery charging and discharging protection system. Various embodiments will be described in detail below with reference to the accompanying drawings.

First, as shown in Figures 1 to 24, each embodiment of the present invention provides a battery module, including a plurality of single cells 100, 1100, 2100, 3100, 4100, wherein the single cells may include a housing, The electric core contained in the shell, the electrode terminals 101, 1101, 2101, 3101, 4101 electrically connected to the electric core, and the cover plate 102, 1102, 2102, 3102, 4102 of the package shell, wherein the electrode terminal is arranged on the cover plate , to complete the current input and output. Wherein, the single battery includes a current interruption device 200, 1200, 3200, 4200 or an explosion-proof valve 2200, and the current interruption device or explosion-proof valve is electrically connected to the electrode terminal, so through the function of the current interruption device, the current of the electrode terminal can be controlled. input and output. That is to say, the current interruption device or the explosion-proof valve is in the state of the battery core in the normal state of the single battery. At this time, the electrode terminals can normally input and output current to complete the charge and discharge of the single battery, but in the dangerous state Under the circumstances, for example, when the battery is overcharged, the current interruption device or the explosion-proof valve can interrupt the current input and current output of the electrode terminal, so as to avoid the battery overcharge and other problems. Therefore, as an important safety measure, the reliability of the current interruption device is very important, that is, the current interruption device needs to be able to respond quickly. In addition, in each embodiment, the current interruption device or the explosion-proof valve can also be fixed relative to the cover, that is, the current interruption device or the explosion-proof valve can be directly fixed on the cover, or can be fixed on any The plate is relatively fixed, such as the electrode terminal installed on the cover plate.

In the present invention, the current interruption device or the explosion-proof valve in each embodiment is a mechanical structure that senses air pressure. Specifically, the current interruption device communicates with the gas inside the shell of the single battery and is capable of disconnecting the gas flowing through it under the pressure. current. Specifically, the transmission of current can be interrupted by disconnecting the internal components, thereby cutting off the charging and discharging of the battery in time. The source of air pressure used is: when the battery is in a dangerous state such as overcharge, gas will be generated inside the battery and then the air pressure inside the casing will increase, or when the battery is abnormal during use, the temperature of the battery will rise and the temperature will increase. The air pressure inside the battery rises, creating the air pressure power that actuates the current interrupt device or explosion-proof valve.

Taking the first embodiment as shown in FIGS. 1 to 12 as an example, the current interrupting device has a conductive member 201 and a flipping member 202 connected to the conductive member 201 to be electrically connected to each other, and the flipping member 202 and the conductive member 201 can be operated under air pressure. The electrical connection is disconnected under the action of the present invention. In different implementations of the present invention, the way of disconnecting the electrical connection can be different. Among them, the connection point between the conductive part and the flipping part can be disconnected, for example, the welding between the two can be disconnected. In order to realize the disconnection of the electrical connection, at least one of the two can also be disconnected, for example, by processing a weak score on the corresponding component to realize the disconnection of its own structure, so as to realize the electrical connection disconnection. That is, to achieve the purpose of breaking the mechanical structure under the action of air pressure to cut off the transmission of electric current in the present invention.

In this way, taking the first embodiment as an example, when, for example, the battery is overcharged, gas will be generated inside the battery and the air pressure will increase. At this time, under the action of a certain air pressure, the inverting member 202 is disconnected from the conductive member 201 through an inverting action. Electrical connection, thereby interrupting the circuit between the electrode terminal 101 and the outside world, and stopping the charging of the battery, so as to prevent the internal pressure of the battery from continuing to rise and ensure the safety of the battery.

In this embodiment, the electrode terminal 101 includes a pole 104 electrically connected to the cell, for example, connected to the cell through an inner lead-out member, wherein the pole 104 passes through the cover plate 102 to lead the current out of the casing. Wherein, in this embodiment, the current interruption device 200 can be installed on the pole 104 . In this way, the air pressure inside the battery can be sensed directly through the pole 104, and the sensitivity is high. In addition, it is avoided to connect the current interruption device 200 to the electrode terminal separately, which is convenient for processing.

Wherein, in the field such as a power battery, a large current needs to pass through, so it is necessary to ensure that the welding structure of the conductive member 201 and the flipping member 202 is stable, and avoid the welding structure being blown by a large current. In this way, in this embodiment, as shown in FIGS. 5 and 6 , the flipping member 202 is connected to the conductive member 201 through a boss welding structure, and the boss welding structure includes a boss 203 and a connecting hole 204 for accommodating the boss 203 And the annular welding spot 217 between the boss 203 and the connection hole 204 . That is, one of the boss 203 and the connection hole 204 is located on the turning member 202 , and the other is located on the conductive member 201 . Therefore, it is ensured that the annular welding spot 217 can stably weld the boss 203 accommodated in the connection hole 204 firmly, and the flow area of the current can be increased to ensure the passage of a large current. Specifically, as an embodiment, the boss 203 may be formed on the conductive member 201, and the connection hole 204 may be formed on the flipping member 202. More specifically, the flipping member 202 is formed as a first sheet structure, and the first sheet A connection hole 204 is formed on the structure, and the conductive element 201 is formed into a second sheet structure, and a boss 203 is formed on the second sheet structure. In other embodiments, the two can be interchanged. In addition, in some manners, laser penetration welding and the like may also be used to weld the turning member 202 and the conductive member 201 .

Among them, in this embodiment, the way of disconnecting the electrical connection between the flipping member and the conductive member can be realized by scoring, that is, a weak part with a lower strength than other regions is processed in the corresponding part, wherein in order to complete the conductive member and the flipping member The complete disconnection of the score is usually around the connection point of the conductive part and the flip part, such as the ring structure of the above-mentioned boss welding structure. Therefore, the disconnection of the electrical connection is realized through the disconnection of the conductive member or the turning member itself, wherein the score can be formed on the turning member or the conductive member. In this embodiment, the conductive member 201 is formed with a score 205 , the notch 205 surrounds the connection point for connecting the flipping member 202 , that is, the conductive member 201 is provided with an annular notch surrounding the boss 203 . In this way, when the internal air pressure of the battery rises, the received air pressure can cause the notch 205 to be pulled off, so that the part of the conductive member 203 surrounded by the notch 205 will break away from the conductive member 201 along with the flipping member 202, thereby realizing the interruption of the current. open. In other implementations, notches can also be formed on the turning member 202 .

As shown in FIG. 7 , in order to break off the notch 205 , preferably, the notch 205 may be elliptical. In this way, when subjected to air pressure, due to the different curvatures of the contours, the area with a larger curvature is more likely to concentrate stress and receive a greater force, so that it can be torn apart first, thereby increasing the sensitivity of the notch 205 being broken. Further, in this embodiment, the boss 203 is circular, and the center of the circle of the oval notch 205 and the center of circle of the boss 203 are staggered along the long axis of the ellipse. In this way, the regions at both ends of the long axis of the ellipse can be stressed unevenly, so that the notch 205 can be pulled off from a local point, thereby improving the sensitivity of the notch 205 .

In addition, it is also possible to set the conductive member turning member 202 coaxially with the electrode terminal 101 , and the conductive member 203 is arranged obliquely relative to the axis of the electrode terminal 101 . In this way, the score at a lower position can be broken first, thereby increasing the sensitivity of the score 205 to be broken. Further, when the notch 205 is elliptical, the major axis of the ellipse can be designed to be inclined to the axis of the conductive element, and when the conductive element is installed on the pole 104, it is also inclined to the axis of the pole. In this way, the region with a larger curvature at the end of the long axis is torn off first, so as to ensure that the notch 205 can be broken normally when needed, and ensure the normal operation of the current interruption device 200 .

In addition, in order to further ensure that the notch 205 is broken, as shown in FIG. 7 , a weakening hole 206 may be designed on the notch 205 . Therefore, the notch 205 is easily broken from the weakening hole 206, and the size and number of the weakening hole 206 can be set according to the actual situation. Preferably, there are multiple weakening holes 206 arranged at intervals along the score 205 . In addition to the weakening effect, when the score is designed on the conductive member 201 , the weakening hole 206 can also be used as a gas guide, so that the gas inside the battery can pass through the weakening hole 206 to exert pressure on the flipping member 202 .

Wherein, when the current interruption device 200 is installed on the pole 104 , the conductive member 201 is connected to the outer end surface of the pole 104 , and the outer peripheral edge of the turning member 202 is fixed relative to the cover plate 102 . In this way, under the action of air pressure, the notch 205 formed on the conductive member 201 can be broken by taking the outer peripheral edge of the turning member 202 as a supporting point. In addition, in order to allow the flipping member 202 to be subjected to air pressure, the outer peripheral edge of the flipping member can be sealed, for example, sealed and connected to the cover plate by welding, so that the internal air pressure can exert force on the flipping member and break the score 205 . Here and similar descriptions, the outer end and the inner end are defined relative to the shell along the axial direction of the pole, and relative to the "inner and outer" of the ring, such as the outer peripheral edge is defined relative to the shell along the radial direction defined by the center of the ring.

In order to ensure that the conductive member 201 is fixed to the pole 104, the notch 205 on it can also be broken off. Preferably, an accommodation hole 218 is formed on the outer end surface of the pole 104, and the outer circumference of the conductive member 201 The edge is fixed on the inner wall of the receiving hole. In this way, the conductive member 201 can be stably fixed by the ring outer circumference, and the area inside the notch 205 is not connected to the pole 104 so that it can be broken under external force, such as the pulling force of the turning member 202 or the direct pressure of the gas.

In the present invention, there are multiple ways for the current interruption device 200 to communicate with the gas inside the battery. In this embodiment, the pole 104 is formed with a gas guide hole that communicates with the inside of the casing and the current interruption device 200 . Thus, the air pressure is applied to the current interrupt device directly through the internal structure of the pole 104 . Make the structure simpler.

Among them, the above-mentioned air guide hole includes two kinds of air guide holes 103 in this embodiment, wherein the first type of air guide hole 103 is used to communicate with the above-mentioned receiving hole 218 and the inside of the housing, that is, to directly apply pressure to the conductive member 201 to punch out the engraving. Mark 205. That is, the air guide hole includes the air guide hole 103 for communicating with the above-mentioned receiving hole 218 and the inside of the casing. The second type of air hole 103 is used to communicate with the flipping member 202 and the inside of the casing, so as to exert pressure on the flipping member and break the notch 205 . Wherein, in order to improve the stress efficiency of the turning member 202, the air guide holes 103 may be multiple surrounding the receiving holes. Therefore, under the joint action of the two kinds of air guide holes 103, the sensitivity of the current interruption device can be increased.

Specifically, as shown in FIG. 2 and FIG. 8 , the pole 104 is fixedly connected to the cover plate 102 , so that the structure of the electrode terminal is stable. Wherein, the outer peripheral edge of the pole 104 has a radial boss 105 , and the radial boss 105 is fixedly connected to the cover plate 102 , and the second type of air guide hole 103 can be processed on it, so that the gas flows to the turning member 202 . In addition, in this embodiment, the first type of air guide hole 103 is formed in the pole 104 along the circumferential direction. That is, the air guide hole 103 on the radial boss 105 is for applying pressure to the turning member 202 , while the air guide hole 103 below the receiving hole 218 can directly apply pressure to the conductive member 201 . As shown in Figure 9, in the embodiment of the present invention, the radial boss 105 of the pole 104 and the body are formed with air guide holes 103, wherein the first type of air guide holes 103 on the body communicate with the accommodation holes 218 on the end face , and the number is four and arranged at equal intervals along the circumferential direction. In other embodiments, the number of the first type of air guide holes 103 may also be other numbers, which is not limited in the present invention.

As shown in Fig. 2, Fig. 3, Fig. 8 and Fig. 10, in order to avoid electrification of the cover plate, preferably, the pole 104 needs to be insulated from the cover plate while being fixedly connected to the cover plate, therefore, the pole 104 is fixedly connected to the cover plate in a sealed connection The ceramic ring 207 of the cover plate 102 is connected, for example, by ceramic brazing. In this way, compared with the insulation achieved by plastic, rubber, etc., the reliability and weather resistance are stronger, and not only the stable and sealed connection of the current interrupt device can be realized, but also the insulation of the two can be realized. Specifically, the outer peripheral edge of the pole 104 has a radial boss 105, and the inner edge of the ceramic ring 207 has a radial support 208 supporting and connecting the radial boss 105, wherein the radial boss 105 can be embedded in the ceramic ring 207 And it is connected with the radial support 208 , that is, the thickness of the radial support 208 is relatively thin to form a stepped accommodation space for the pole 104 to be embedded.

As shown in Figure 11, in another example of this embodiment, different from the above-mentioned ventilation method by opening air guide holes 103 on the pole, the radial bosses 105 and the radial supports 208 are respectively arranged at intervals along the circumferential direction There are multiple, that is, there are multiple radial bosses 105 and they are arranged at intervals in the circumferential direction, and there are also multiple radial supports 208 and they are arranged at intervals in the circumferential direction, and the plurality of radial bosses and the plurality of radial supports one by one correspond. In this way, ventilation can be realized through the intervals between adjacent radial bosses 105 and radial supports 208, the structure is simpler and more ingenious, and the processing is convenient. The area where the pole 104 is fitted with the conductive element 201 can maximize the size of the conductive element 201 , thereby increasing the size of the notch and ensuring the sensitivity of breaking. In this embodiment, three radial bosses 104 are arranged at equal intervals, so as to take into account connection stability and air permeability. In other embodiments, the number of radial bosses can also be other numbers, such as four or more.

In these two embodiments, the outer end surface of the ceramic ring 207 is formed into a stepped structure with an inner ring and an outer ring, and the pole 104 is embedded and connected to the inner ring. The difference is that in the embodiment of the integral radial boss 105, the inner ring is formed as an integral annular radial support, while in the embodiment of the split radial boss, the inner ring forms the above-mentioned multiple The radial supports 208 arranged at intervals make the overall structure more compact and the connection more stable.

In this embodiment, in order to establish a current flow path with the outside world, preferably, a conductive ring 216 is sealed and connected to the outer end surface of the ceramic ring 207, specifically connected to the outer ring, and the outer peripheral edge of the flipping member 202 is fixedly connected to the conductive ring. 216, that is, the turning member 202 is connected to the ceramic ring 207 through a conductive ring, and the conductive ring can establish a current loop between the turning member and the outside world. In order to prevent the conductive ring from still being electrically connected to the pole after the notch is broken, the function of current interruption is lost. Preferably, the conductive ring 216 is sealed and connected to the outer ring of the ceramic ring to insulate the pole, that is, the pole 104 and the conductive ring 216 are insulated by the ceramic ring. In addition, the sealing connection of the conductive ring 216 to the ceramic ring can seal the outer peripheral edge of the flipping member, so that the air pressure inside the casing can act on the flipping member without air leakage.

Wherein, in order to achieve a stable connection between the conductive ring and the turning member, the outer end surface of the conductive ring 216 is formed with an L-shaped notch, and the inner end surface thereof is used to connect the outer ring of the ceramic ring. The outer peripheral edge of the flipping member 202 is embedded and supported in the L-shaped notch, and the outer peripheral edge is sealed and connected to the L-shaped notch through the cap 210 covering the flipping member 202 . Therefore, while achieving a stable and sealed assembly of the turning member 202 , the current interruption device 200 can be protected. In addition, the conductive ring 216 can establish a current loop with the outside world through the electrode lead-out piece connected to the cap or directly connected, for example, between adjacent single cells 100 or between adjacent battery modules can be connected through the electrode lead-out piece .

In order to facilitate the sealing connection between the ceramic ring 207 and the cover plate 102, preferably, a transition ring 209 is sealingly connected to the inner end surface of the ceramic ring 207. The transition ring 209 can be connected to the ceramic ring 207 by ceramic brazing, and the transition ring 209 is sealed. Connected to the cover plate 102. The transition ring 209 can also make the ceramic ring 207 and the cover plate 102 spaced apart. Because the ceramic ring 207 is not directly assembled with the cover plate 102, the high temperature when the cover plate 102 is brazed with the ceramic ring is avoided, and the area of the ceramic ring 207 will not be restricted due to the need to be directly assembled with the cover plate 102, and it will not A special design is required for the ceramic ring 207, which is convenient for manufacture and assembly.

Wherein, as shown in FIG. 8 , preferably, the transition ring 209 has an inner ring and an outer ring forming a Z-shaped structure, and the cover plate 102 is formed with a through hole through which the pole 104 passes, and the end surface of the through hole is a stepped structure. The inner ring of the transition ring is embedded and supported in the stepped structure. That is, in Figure 8, the inner ring is located below and embedded in the through hole, thereby increasing the contact area between the two to ensure a stable connection.

Therefore, in this embodiment, in order to realize the operation of the current interruption device, the outer peripheral edge of the flipping member 202 needs to be sealed, specifically, a ceramic ring 207 is sealed and connected between the outer peripheral edge of the flipping member and the cover plate, so that through the ceramic structure Sealing realizes stable and reliable operation of the current interruption device. In this ceramic sealing structure, the air pressure inside the casing can effectively act on the current through the respective seals between the cover plate and the transition ring, the transition ring and the ceramic ring, the ceramic ring and the conductive ring, and the conductive ring and the flipping member. Interrupting device, so that the current interrupting device works reliably. During assembly, in order to ensure the tightness of the current interruption device, the ceramic ring 207 is connected to the conductive ring 216 , the pole 104 and the transition ring 209 respectively through ceramic brazing. That is to say, these four components can be firstly formed into an independent assembly, and then the transition ring 209 is assembled to the cover plate 102 by laser welding, which is convenient for assembly without directly welding the ceramic cover plate. In addition, the conductive part 201 and the pole 104 can be connected by laser welding, the turning part and the conductive part can be connected by laser penetration welding or the above-mentioned boss welding structure and other welding methods, and the cap 210 can be connected with the conductive ring by laser welding. In addition, the pole 104 can be laser welded together with the lead-out piece of the battery, so as to complete the assembly and work of the overall current interruption device.

The above mainly introduces the structure of the current interruption device in the first embodiment, and the arrangement of the current interruption device in the first embodiment will be described below.

In order to ensure the normal and timely operation of the air pressure-driven current interruption device, the size of the current interruption device can be designed larger, so that the breaking force can be increased by increasing the force bearing area under the condition of constant air pressure. For example, the area of the overturning piece is designed to be larger to increase the breaking force of the overturning piece. In this embodiment, as shown in FIG. 1 , the current interruption device 200 is designed to extend radially beyond the cover plate 102 , thereby increasing its size. At this time, in the battery module, there are multiple single cells 100. Between adjacent single cells 100, in order to prevent the extended current interruption device 100 from interfering with the electrode terminals on adjacent single cells 100, preferably, The current interruption device 200 is staggered from adjacent electrode terminals in the height direction and/or the extension direction of the cover plate. In this way, the area of the cover plate 102 not provided with the electrode terminal 101 can be fully utilized, so that the protruding current interruption device will not interfere with the structure on the adjacent cover plate, fully saving the space in the battery pack, and improving the energy density in the pack. It should be noted that the meanings of the current interruption device and the adjacent electrode terminal, or the electrode terminal and the adjacent electrode terminal between adjacent single cells in the present invention and in the following all refer to the meanings of different cells. The connection of adjacent features between bulk cells, rather than the connection of adjacent features on the same single cell.

In this embodiment, the current interruption device 200 and the adjacent electrode terminals 101 are staggered in the extending direction of the cover plate. In other embodiments, the two can also be staggered from each other in the height direction.

As an example, as shown in FIG. 1, between adjacent single cells 100, the current interruption device 200 is connected to the adjacent electrode terminals through an L-shaped connector 214, and the L-shaped connector 214 has a cover The covering part 211 is covered and connected to the current interrupting device 200, and the leading part 212 extends to the adjacent electrode terminal to be adjacent thereto. Wherein, the L-shaped inflection structure as shown in FIG. 1 can first be extended to be aligned with the adjacent electrode terminal in the extending direction of the cover plate and then extended to the electrode terminal. In other embodiments, the L-shaped connector It can also be extended to the adjacent cover plate first, and then extended to the electrode terminal, so as to realize the electrical connection between the two.

As another embodiment, as shown in FIG. 2 , between adjacent single cells 100 , the current interruption device 200 includes a cap 210 covering the flipping member 202 , and the cap 210 extends along the cover plate 102 to the adjacent cells 100 . The electrode terminals are aligned, that is, have the covering portion 211 and the lead-out portion 212 arranged in a straight line, and are connected to adjacent electrode terminals through the straight I-shaped connecting piece 215 . The I-shaped connector 215 can also be used to connect the electrode terminals 101 without the current interruption device 200 between other single cells 100, so that, through the cap 210 of this shape, basically only need to use This type of connector will suffice.

Different from the above-mentioned embodiment shown in FIG. 2 , as shown in FIG. 12 , a larger current interruption device can also be adapted by adding a single battery 100 . Specifically, between adjacent single cells 100, the width of the single cells 100 provided with the current interrupting device 200 is larger than the width of the single cells without the current interrupting device 200, and the current interrupting device 200 is close to the cover plate 102. The width edges are extended so that an adaptation to the current interruption device 200 is likewise possible.

In addition, due to the relatively large width of the corresponding single battery, the current interruption device does not protrude from the cover plate, so that adjacent electrode terminals can be aligned with each other. In this way, it is also possible to prevent the current interruption device 200 extending out of the cover plate 102 from affecting other structures such as welding structures on the connected cover plate 102 . And preferably, the current interruption device can be connected to adjacent electrode terminals through a straight I-shaped connecting piece 215 .

In addition, when in use, although the width of the single battery 100 is increased, the capacity of the battery cell is not increased, that is, the capacity of the battery cell in the single battery 100 provided with the current interruption device 200 is the same as that of a battery cell without the current interruption device 200. The battery cells in the bulk battery 100 have the same capacity, thereby avoiding the existence of single batteries with different capacities under the same module, and avoiding the impact on the BMS. Wherein, since the battery cells have the same capacity, the excess size inside the housing can be filled with separators, that is, the cells are filled with separators. In order to make the assembly structure of the battery cell stable. Considering the size of the battery module and the size of the monomer, the volume ratio of the battery cell and the separator can be 1:1-2:1, and the separator can be made of a material resistant to electrolyte.

In addition, from the perspective of current interruption effect, cost and assembly, among multiple single batteries 100 of the same module, the number of single batteries with current interruption device 200 should not exceed three; The number of single cells of the device 200 is 3; preferably, the single cells of the current interruption device 200 are the single cells located at the end and the center of the battery module; wherein, if the battery module includes n sequential Arranged single cells, the single cells at the end of the battery module are the first single cell of the battery module and the nth single cell of the battery module; when n is an odd number, the battery module The single battery in the central part of the battery pack is the n+1/2th single battery of the battery module; when n is an even number, the single battery in the central part of the battery module is the n/th single battery of the battery module 2 single cells or the n+2/2th single cell, where n≥3.

The above has introduced the current interruption device, single battery, and battery module provided by the first embodiment of the present invention. Without departing from the concept of the present invention, the features in the first embodiment are, for example, boss welding structure, elliptical notch, Ceramic rings and the like can be applied to other embodiments described below. The power battery provided by the second embodiment of the present invention will be described below with reference to FIGS. 13 to 17 .

As shown in FIG. 13 and FIG. 14 , the second embodiment of the present invention provides a single battery 1100, the single battery 1100 includes a casing, a cell housed in the casing, and an electrode terminal 1101 electrically connected to the cell And the cover plate 1102 of the packaging shell, the electrode terminals 1101 are arranged on the cover plate 1102 for input and output of electric current. Wherein, the single unit 1100 also includes a current interruption device 1200 communicating with the internal gas of the casing. The difference from the way of being installed on the electrode terminals in the first embodiment is that the current interruption device 1200 is arranged on the cover plate and connected to the casing. Internal gas communication, wherein the current interrupting device 1200 has a conductive element 1201 and a flipping element 1202 connected to the conductive element 1201 to be electrically connected to each other, and the flipping element 1202 and the conductive element 1201 can be electrically disconnected under the action of air pressure. That is, the working principle of the current interruption device 1200 is basically the same as that of the current interruption device in the first embodiment, both of which sense the air pressure inside the single battery to realize the flipping of the flipping member and disconnect the circuit.

Wherein, because it is not arranged on the electrode terminal, the conductive member 1201 has a body portion 1299 connected to the flipping member 1202 and a connecting portion 1298 extending from the body portion 1299 to the electrode terminal 1101 and connected to the electrode terminal 1101, so through the second In the implementation manner, the current interruption device 1200 is arranged on the cover plate, which avoids increasing the height of the electrode terminals 1101, thereby increasing the battery capacity density by utilizing the length space of the cover plate.

As shown in FIG. 15 to FIG. 17 , in this embodiment, the body portion 1299 of the conductive member 1201 communicates with the internal gas of the housing and is formed with a notch 1205 , and the notch 1205 is arranged around the connection point for connecting the turning member 1202 . Therefore, the notch can be broken under the action of internal air pressure, thereby disconnecting the electrical connection between the flipping member and the conductive member. Further, a ventilation hole 1206 is provided on the notch 1205 . In this way, not only can the air pressure be applied to the turning member 1202 through the air hole 1206, but the actual pulling force on the notch can be achieved through the turning member, and the casing 1205 can be easily broken at the position of the vent hole 1206 to lift the turning member 1202. The role of the sensitivity, this time mark can also be set on the flip. There can be a plurality of air holes 1206 and they are arranged at intervals along the score 1205 . In addition, for features such as notches and air holes, the features in the first embodiment can be applied to this embodiment. In other implementation manners, notches may be respectively provided on the body part of the conductive element and the turning element. In this way, when the air pressure inside the shell continues to rise, in addition to breaking the notches on the conductive parts to interrupt the current, the notches on the flipping parts can also be broken continuously. At this time, the gas inside the battery can be charged to the flipping parts. To ensure that the air pressure in the shell of the single battery is prevented from continuing to increase. In addition, the gas sensor in the battery pack can sense an alarm or cut off the circuit. This part will be introduced in detail later.

Specifically, the score 1205 on the body part can be broken under the action of the first air pressure in the shell, and the score on the turning part can be broken under the action of the second air pressure in the shell, and the second air pressure is greater than the first air pressure. That is, the strength of the first notch is smaller than that of the second notch, so that it can be broken by the smaller first air pressure. Only when the air pressure continues to rise, just continue to break the second notch and release the pressure.

In this embodiment, in order to ensure that the inverting member 1202 can receive the internal air pressure force, the outer peripheral edge of the inverting member 1202 is in sealing connection with the conductive member 1201 to prevent the gas from leaking from the outer peripheral edge of the inverting member. Specifically, the cover plate 1102 is provided with a vent hole that communicates with the gas inside the housing, and the cover plate is sealed with a first ceramic ring 1207 surrounding the vent hole, and the body part 1299 is sealed with the first ceramic ring 1207, so that This enables the internal air pressure to act on the body part 1299 without leakage. In addition, in order to stably assemble the turning member 1202 , the outer peripheral edge of the turning member 1202 is sealingly connected to the second ceramic ring 1296 , and the second ceramic ring is sealingly connected to the conductive member 1201 . Therefore, through the insulating properties of the second ceramic ring, the outer periphery of the flipping member 1202 can be stably supported and the outer periphery of the conductive member and the flipping member 1202 can be insulated by the second ceramic ring 1296, so that the flipping member 1202 and the conductive member After the 1201 is pulled off by the notch 1205, the current connection can be kept disconnected, so as to play the role of current interruption.

Specifically, as an example, as shown in FIG. 17 , an annular boss 1297 surrounding the notch 1205 is formed on the body portion 1299 of the conductive member 1201. In this way, through the structure of the annular boss 1297, its diameter The inner side can be used to form the notch 1205 and other features, and can make the back concave part of the annular boss 1297 sealingly accommodate the first ceramic ring 1207, in addition, the outer side of the annular boss 1297 can be used to seal and support the Second ceramic ring 1296. In this way, in the second embodiment of the present invention, through the unique structure of the conductive member shown in FIG. 16 , the current interruption device 1200 can be installed more conveniently.

In addition, the first ceramic ring 1207 is sealed and connected to the cover plate 1102 through a transition ring 1209. As shown in FIG. . The flange ring protrudes radially from the connecting body and fits with the cover plate. Therefore, a stable installation of the current interrupting device 200 is ensured without the first ceramic ring 1207 being directly connected to the cover plate 1102 .

In this embodiment, in order to facilitate the connection, preferably, the electrode terminal 1101 includes a pole 1104 that passes through the cover plate 1102 and is electrically connected to the battery core. into the slot 1295 and welded to each other, so as to realize the stable connection of the two. In addition, the current interruption device 1200 includes a connecting piece 1210 covering the flipping piece 1202 and electrically connected to the flipping piece 1202. The connecting piece 1210 has a covering portion 1294 covering the flipping piece 1202 and a lead-out portion extending from the covering portion 1294. 1293. The connecting piece 1210 can be formed into the same structure as the L-shaped connecting piece 214 in the first embodiment, that is, the covering part and the leading part are formed into an L-shaped inflection structure. Therefore, it is convenient to lead out the current from the current interruption device 1200 to the adjacent electrode terminal or outside the module.

Wherein in the battery module in which at least one single battery is the above-mentioned single battery 1100 , the current interruption device extends radially out of the cover plate, thereby increasing the force-bearing area and increasing the breaking force. Between adjacent single cells, the current interruption device and the adjacent electrode terminals are staggered in the extending direction of the cover plate 1102 , so as to avoid interfering with the structure on the adjacent cover plate. In addition, the same as the first embodiment, the number of single cells 1100 provided with the current interruption device 1200 is not more than three.

The above describes the power battery provided by the second embodiment of the present invention, which mainly describes the features different from those of the first embodiment, and the features of the two embodiments can be replaced and combined without contradiction. I won't go into too much detail here.

The following describes the single battery 2100 provided by the third embodiment of the present invention in conjunction with FIG. 18 , which includes a casing, a cell contained in the casing, an electrode terminal 2101 electrically connected to the cell, and a cover plate 2102 for encapsulating the casing. The terminal 2101 is arranged on the cover plate 2102, wherein the single battery includes a first electrode lead-out piece 2298 electrically connected to the battery cell, and a second electrode lead-out piece 2297 electrically connected to the electrode terminal 2101, and the cover plate 2102 is also provided with a An explosion-proof valve 2200 connected to the gas inside the casing, the explosion-proof valve 2200 has a turning part 2202 connecting the first electrode leading part 2298 and the second electrode leading part 2297, that is, the two electrode leading parts are connected through the turning part 2202.

Wherein, a first notch 2205 is formed on the first electrode lead-out part 2298 and/or the second electrode lead-out part 2297, and the first notch 2205 can be broken under the action of air pressure in the casing to interrupt the first electrode lead-out part 2298 And/or the current on the second electrode lead-out part 2297, that is, the effect of the first notch is to make the electrode lead-out part provided with it disconnected so as to interrupt the transmission of the current, so at least one of the two electrode lead-out parts is provided with the first notch. A notch can realize the disconnection of the electrical connection between the battery cell and the electrode terminal, and then disconnect the current transmission between the single battery and the outside world. In addition, the flipping member 2202 is also provided with a second notch 2299, and the second notch 2299 can be broken under the action of the air pressure in the casing so that the gas in the casing leaks out through the flipping member 2202, that is, the second moment The role of the trace is to ventilate. After disconnection, the internal gas can leak out, so as to prevent the internal pressure of the battery from continuing to rise and cause an explosion, so as to play an explosion-proof role.

Specifically, the first score can be broken under the action of the first air pressure inside the shell, and the second score can be broken under the action of the second air pressure inside the shell, and the second air pressure is greater than the first air pressure. That is, the strength of the first notch 2205 is smaller than that of the second notch 2205, so that it can be broken by the smaller first air pressure. Only when the air pressure continues to rise, the second notch 2205 is broken and the pressure is released.

As shown in FIG. 18 , in this embodiment, the two electrode lead-out parts can be long sheet structures, so that in order to break the current, the first notch 225 extends from one edge to the other along the width direction of the long sheet structure. One side edge, so that the elongated structure can be broken along the first score in a more timely manner. The turning part 2202 can be formed with a ring-shaped outer wall, and the two electrode lead-out parts can be fixedly connected to the ring-shaped outer wall to realize current transmission. Specifically, in the present invention, the annular outer wall of the turning member can be formed by, for example, a boss in a boss welding structure, and the turning member is also formed with a cone ring structure, and the cone ring extends obliquely from the boss to the turning side. the outer perimeter of the piece to form a bowl-shaped overturned piece. In addition, the second notch can be formed as a ring structure around the circumference of the flipping member, so as to be completely disconnected under the action of air pressure, so as to increase the efficiency of gas pressure release. In particular the second score may be formed on the cone ring structure. In order to make the flipping member can be effectively broken by the air pressure to break the first notch and the second notch, the outer peripheral edge of the flipping member 2202 is relatively fixed and insulated with the cover plate. In the case of one notch and a second notch, the leakage renders both notches useless. On the other hand, electrification of the cover plate can be avoided by means of an insulating connection.

In this embodiment, the electrode terminal 2101 includes a pole passing through the cover, and the pole is insulated and connected to the outer side of the cover through a second ceramic ring, so as to establish a current loop with the outside. That is, the connection between adjacent single cells is realized through the mutual connection of the electrode terminals. Among them, the cover plate can be prevented from being electrified by the ceramic ring. In addition, a first ceramic ring 2207 is sealingly connected between the outer peripheral edge of the turning member 2202 and the cover plate, which also plays the role of sealing and insulation.

In addition, in order to facilitate the connection of the turning member 2202, a first transition piece 2295 is fixedly connected to the cover plate 2102, and a second transition piece 2296 is fixedly connected to the outer periphery of the turning member 2202. The first transition piece and the second transition piece may be aluminum sheets. The first transition piece 2295 and the second transition piece 2296 are brazed coaxially with the first ceramic ring 2207 . In this way, when assembling, the two transition pieces can be welded to the ceramic ring by brazing first, and then the two fixed pieces are welded to other structures, which can avoid the gap between the ceramic ring and the cover plate and other structures. The high temperature generated by brazing, etc., thereby facilitates assembly and realizes a sealed, stable and insulating seal through the first ceramic ring 2207, and can prevent the cover plate 2102 from being electrified.

Specifically, the first transition piece 2295 and the second transition piece 2296 can respectively be annular structures to adapt to the two annular end faces of the ceramic ring. In addition, preferably, the cover plate 2102 is formed with an annular boss, the first transition piece 2205 is supported on the annular boss, and the ceramic ring clings to the inner wall of the annular boss and extends toward the second transition piece 2296, thereby passing The ceramic ring is stably attached in the cover plate 2102 .

In addition, the explosion-proof valve also includes a protective film 2099 that can be breached by air pressure, and the protective film is sealed and covered above the turning part 2202, specifically connected to the first transition piece 2295 away from the turning part. In this way, under normal circumstances, the protective film 2099 can protect the inside of the explosion-proof valve 2200, and when explosion-proof is required, it can be broken through by a certain air pressure, such as the second air pressure, so as to avoid affecting the explosion-proof effect of the explosion-proof valve.

In addition, in order to realize the successive breaking of the two notches in the present invention, the ratio of the residual thickness of the first notch to the residual thickness of the second notch is 1:3-1:1.2. Further, it is 1:2-1:1.3.

The above describes the single battery provided by the third embodiment of the present invention. The fourth embodiment provided by the present invention will be described below with reference to FIG. 22 .

The fourth embodiment of the present invention provides a single battery 3100 and a battery module using the single battery. The single battery 3100 includes a casing, an electric core contained in the casing, a cover plate 3102 for encapsulating the casing, and an electrode terminal 3101 arranged on the cover plate 3102, wherein the single battery 3100 also includes a The inner lead-out piece 3299 and the current interruption device 3200 connected between the inner lead-out piece 3299 and the electrode terminal 3101, wherein, different from the method of being installed on the outer end of the pole in the first embodiment, the current interruption device 3200 in this embodiment It is located inside the cover plate 3102 and is in gas communication with the interior of the casing so as to be able to disconnect the flowing current under the action of air pressure, wherein the electrode terminal 3101 is connected with an adapter 3298 extending radially outward from the outer periphery to pass through The adapter 3298 is connected to the outer periphery of the current interrupt device.

In this way, since there is an adapter 3298 extending radially outward from the outer periphery of the electrode terminal, the area of the current interruption device connected to the radially outer side of the adapter 3298 can be designed smaller than that directly connected to the electrode terminal. Larger, thereby increasing the force application area of the internal air pressure on the electrode interrupting device, so that the force of the electrode interrupting device can be increased under the condition of constant air pressure, and the sensitivity of the current interrupting device 3200 can be improved, and the current can be cut off in time. Especially when the battery of the present invention is used in the field of large batteries such as power batteries, since it is often necessary to transmit large currents, adding adapters and enlarging the size of the current interrupting device can utilize the transmission of large currents.

In this embodiment, the adapter 3298 is formed into a ring structure, the inner periphery of the ring structure is connected to the outer periphery of the electrode terminal, and the outer periphery is connected to the outer periphery of the current interruption device, thereby increasing the area of the current interruption device In other embodiments, the adapter 3298 can also be a structure of a plurality of connecting columns extending radially and spaced along the circumference, which can also achieve the effect of increasing the area of the current interruption device.

In this embodiment, in order to increase the firmness of the adapter, the electrode terminal and the current interrupting device, it ensures stable current transmission. Preferably, the inner peripheral edge of the ring structure fits with the outer peripheral notch of the inner end of the electrode terminal, specifically, a notch can be formed on the outer peripheral edge of the inner end of the electrode terminal, and the inner peripheral edge of the adapter piece is inserted into the inner peripheral edge of the electrode terminal. The notch is connected in parallel, thereby increasing the connection area and ensuring stable connection while increasing the current transfer efficiency. The inner and outer ends of the electrode terminal are defined relative to the casing along its axial direction, that is, the inner end is close to the inside of the casing.

In addition, in this embodiment, the outer peripheral edge of the ring-shaped structure protrudes toward the inside of the housing, that is, the ring-shaped structure itself is formed as a ring cap structure, and the current interruption device is matched with the inner spigot of the outer peripheral edge, so that Not only can the connection be secured to increase the efficiency of current transfer, but also the current interrupting device and the electrode terminal can be spaced apart so that a space is provided for the disconnection of the current interrupting device under the action of air pressure.

In this embodiment, the inner lead-out member 3299 includes a connection piece (not shown) connected to the battery cell, and the connection piece extends from the battery cell toward the cover plate. In addition, the inner lead-out part also includes a support groove for accommodating and installing the current interruption device, and a connecting plate extending from the supporting groove in the opposite direction. It can be formed into an integral sheet structure with the connecting groove, that is, the connecting groove includes two side walls and a bottom wall, and the two side walls are respectively connected with the connecting plates on both sides. In addition, in order to allow the current interruption device to communicate with the gas inside the housing, the bottom wall of the support groove may be designed to form an air hole that communicates with the gas inside the housing.

In this embodiment, in order to avoid electrification of the cover plate, the inner lead-out member 3299 is insulated and connected to the inner side of the cover plate 3102 through the ceramic part 3296 . Specifically, the ceramic piece 3296 can be formed as a ceramic piece, and is connected to the inner lead-out piece 3299 and the cover plate by welding respectively through the transition piece 3294, that is, the transition piece 3294 is two pieces, and the transition piece can be an aluminum piece, respectively positioned on the ceramic piece 3296. The upper and lower surfaces of the ceramic part 3296 are welded to the cover plate 3102 through the transition piece 3294 on the upper surface of the ceramic part 3296, and the ceramic part 3296 is also welded to the inner lead-out part 3299 through the transition piece 3294 on the lower surface of the ceramic part 3296, so that This makes the welding connection between the ceramic part 3296, the cover plate 3102 and the inner lead-out part 3299 easier to realize, and the welding structure is stable. The ceramic part 3296 and the transition piece 3294 on its upper and lower surfaces can be connected by ceramic brazing, the transition piece 3294 on the upper surface of the ceramic part 3296 and the cover plate 3102 can be connected by laser welding, and the transition piece 3294 on the upper surface of the ceramic part 3296 can be connected by laser welding. The transition piece 3294 and the inner lead-out piece 3299 can be connected by laser welding.

In this embodiment, the current interruption device 3200 has a conductive member 3201 and a flipping member 3202 connected to the conductive The part 3201 is connected to the inner lead-out part 3299 and is formed with an air guide hole 3203 communicating with the inside of the shell. Specifically, the conductive part 3201 is embedded in the support groove connected to the inner lead-out part, so that the air passage hole formed in the support groove can be connected with the guide The air holes 3203 are gas-connected, so that the turning member 3202 can feel the internal gas pressure of the casing, so that the turning member 3202 and the conductive member 3201 are disconnected electrically under the action of the internal air pressure. Wherein, the outer peripheral edge of the turning member 3202 is connected with the outer peripheral edge of the adapter member 3298 to establish a current connection path.

Wherein, in this embodiment, as a way of disconnecting the electrical connection, a notch is formed on the conductive member 3201 , and the notch is arranged around the connection point for connecting the turning member 3202 . In this way, under the action of the internal air pressure, the notch will be pulled off so as to disconnect the electrical connection with the flipping member. In other embodiments, the notch can also be formed on the turning part or the way of breaking the connecting point between the two parts can be adopted. In order to realize the pressurization of the air pressure on the turning part 3202, the outer peripheral edge of the turning part 3202 is supported and connected to the conductive part 3201 and/or the inner lead-out part 3299 through the insulating part 3295, thereby realizing the assembly of the turning part 3202 through the insulating part 3295, like this It can ensure that the outer peripheral edge of the turning part is insulated from the inner lead-out part 3299 and the conductive part, thereby avoiding that the turning part will not be electrically connected to the conductive part or the inner lead-out part after the turning part is disconnected from the conductive part under the action of air pressure.

Specifically, the insulator can be an annular insulator such as a ceramic ring, a sealing ring, etc., wherein the insulator has three connection methods, the first is to be sealed and supported on the conductive member 3201, specifically, the support is pulled off around the conductive member 3201 The area of the area, the second is supported on the inner lead-out member 3299, specifically the area where the inner lead-out member 3299 surrounds the conductive member 3201, and the third is supported on the inner lead-out member 3299 and the conductive member 3201 at the same time, that is, as As shown in FIG. 23 , the insulating member is supported on the connection area between the inner lead-out member 3299 and the conductive member 3201 .

Among them, in order to ensure the stable current transmission of the conductive part and the turning part, especially for power batteries with high current, similar to the first embodiment, when the conductive part is provided with a notch 3205, as shown in Figure 23, the turning part 3202 is connected with the conductive member 3201 through the boss welding structure surrounded by the notch 3205. The boss welding structure includes a boss 3203, a connecting hole 3204 for accommodating the boss 3203, and a hole between the boss 3203 and the connecting hole 3204. The annular welding spot 3217 ensures the effective passage of large current. Specifically, as shown in FIG. 23 , different from that shown in FIG. 6 in the first embodiment, the boss 3203 is formed on the turning member 3202 , and the connecting hole 3204 is formed on the conductive member 3201 . In addition, similar to the first embodiment, the boss can be formed on the conductive member 3201, and the connection hole 3204 can be formed on the flipping member.

In addition, as shown in FIG. 22, as an embodiment, the conductive member 3201 can be formed into a cap-like structure, which includes a cap body connected to the flipping member and a visor surrounding the cap body, wherein the visor is formed with the above-mentioned The air guide hole is connected with the inner outlet part, and the cap body protrudes toward the turning part, and the turning part is formed into a sheet structure, and the above-mentioned insulating part 3295 is connected between the outer peripheral edge of the sheet structure and the visor. Therefore, the current interruption device provided by the present invention has a compact structure and stable assembly.

In this embodiment, in order to establish a current loop with the outside world, preferably, the electrode terminal 3101 includes a pole 3104 passing through the cover plate, and the pole is insulated and connected to the cover plate through a ceramic ring 3293, so as to prevent the cover plate from being electrified. The connector 3298 is connected to the inner end of the pole to establish a current loop with the outside through the part exposed outside the cover plate. Specifically, the ceramic ring 3293 is sealingly connected to the outer surface of the cover plate, and is sealingly connected to the pole 3104 to ensure the sealing effect inside the cover plate. Wherein, an air hole 3292 is formed axially through the pole. In this way, when the current interrupting device 3200 is interrupted by pressure, it will not be affected by the air pressure in the closed cavity in the cover plate, but can establish a pressure difference with the outside atmosphere, so that the turning member 3202 can operate under the action of the internal and external pressure difference. And pull off the notch 3205.

The above describes the single battery provided by the fourth embodiment of the present invention. The fifth embodiment provided by the present invention will be described below with reference to FIG. 24 .

The fifth embodiment of the present invention provides a single battery 4100 and a battery module using the single battery, wherein the single battery 4100 includes a casing, a battery cell accommodated in the casing, and an electrode electrically connected to the battery cell The terminal 4101 and the cover plate 4102 of the packaging case, the electrode terminal 4101 is arranged on the cover plate 4102, wherein the electrode terminal includes a pole 4104 which passes through the cover plate 4102 and is electrically connected to the battery core through the inner lead-out piece 4196, and the single battery also It includes a current interruption device 4200 installed on the pole 4104, the current interruption device 4200 has a flipping member 4202 fixed relative to the cover plate 4102 and communicated with the internal gas of the housing, and the turning member 4202 is connected to the outer end surface of the pole 4104 through connected at a point that can be disconnected under the action of air pressure. In this way, the working principle of the current interrupting device in this embodiment is to directly pull apart the connection point between the flipping member 4202 and the pole 4104 through air pressure, thereby interrupting the electrical connection between the two.

In order to improve the sensitivity, preferably, the flipper 4202 is connected to the pole through a single welding point 4199 . For example, the welding spot 4199 completed by spot welding can also be realized by other welding methods such as laser welding. Therefore, in this embodiment, the penetration depth and the penetration width of the welding point can be reasonably implemented, so as to realize the control of the breaking pressure.

In this embodiment, similar to the first embodiment, the pole 4104 is formed with an air guide hole 4103 communicating with the inside of the casing, so that the internal air pressure can be conveniently guided to the current interrupting device. In addition, in order to further improve the reliability of the current interruption device, preferably, a notch 4205 is formed on the flipping member 4202, and the notch 4205 is arranged around the connection point. In this way, in addition to the above-mentioned breaking connection point, the breaking of the current can also be realized through the breaking score 4205 . In this embodiment, the breaking air pressure of the connection point and the notch has a sequence. Specifically, the connection point can be broken under the action of the first air pressure in the casing, the notch 4205 can be broken under the action of the second air pressure, and the second air pressure can be broken under the action of the second air pressure. The second air pressure is greater than the first air pressure. Therefore, the notch 4205 can be used as a backup measure for the connection point to ensure the safety of the battery. More preferably, the overturning member 4202 is covered with a cap 4210 , and an air hole 4197 is formed on the cap 4210 . In this way, when the notch 4205 is pulled off, the gas inside the casing will be discharged from the air hole 4197 through the turning part, and then realize the pressure relief inside the battery to prevent the explosion inside the battery. This principle is the same as that of the explosion-proof valve of the third embodiment. similar.

In this embodiment, a first ceramic ring 4207 is connected between the pole 4104 and the cover plate 4102 , so as to realize the stable installation of the pole through the ceramic structure and at the same time prevent the cover plate 4102 from being electrified. In addition, a second ceramic ring 4198 is sealed and connected between the pole 4104 and the outer peripheral edge of the flipping member, so that the sealing of the outer peripheral edge of the flipping member can be realized through the ceramic structure, ensuring that the internal gas can effectively exert pressure on the flipping member, and At the same time, the insulation between the pole and the outer periphery of the flipping piece is ensured, so as to prevent the flipping piece from being able to conduct electricity after the connection point is broken or the nick is cut.

Specifically as an embodiment, the pole 4104 has an annular boss 4297 formed around the connection point, so that through the structural characteristics of the annular boss, the concave portion on the back of the annular boss 4297 is sealed to accommodate the first Ceramic ring 4207, the first ceramic ring 4207 is sealingly connected to the cover plate 4102, and the radially outer side of the annular boss 4297 is hermetically supported by a second ceramic ring 4198, and the second ceramic ring 4198 is sealingly supporting the outer peripheral edge of the turning member 4202 . The structure of the overall current interrupting device is made more compact, and the assembly is stable. For ease of assembly, the first ceramic ring 4207 is sealed and connected to the cover plate 4102 through a transition ring 4209 . Specifically, the transition ring and the first ceramic ring 4207 may be sealed and connected by ceramic brazing.

The first to fifth embodiments of the present invention have been described above. Next, an embodiment of a single battery and a battery module provided by the present invention will be introduced with reference to FIG. 20 and FIG. 21 . I won't go into too much detail here.

In this embodiment, a single battery is provided. The single battery 100 includes a casing 109, a cell 108 housed in the casing 109, an electrode terminal 101 electrically connected to the cell 108, and a cover plate 102 for encapsulating the casing. , the electrode terminal 101 is arranged on the cover plate 102, the electrode terminal includes a pole 104 that passes through the cover plate 102 and is electrically connected with the cell, and the single battery also includes a current interruption device 200 installed on the pole 104, the current interruption The device 200 is in gas communication with the interior of the casing, wherein the current interrupting device 200 has a conductive member 201 and a flipping member 202 connected to the conductive member 201 to be electrically connected to each other, and the flipping member 202 and the conductive member 201 can disconnect electricity under the action of air pressure. connection, wherein the conductive member 201 is connected to the pole 104 to be electrically connected to each other, the flipping member 202 and the conductive member 201 are connected through a boss welding structure, and the boss welding structure includes a boss 203 and a connecting hole 204 for accommodating the boss 203 As well as the annular welding spot 217 between the boss 203 and the connection hole 204, the flipping member 202 is formed as a first sheet structure, the connection hole 204 is formed on the first sheet structure, and the conductive member 201 is formed as a second sheet A boss 203 is formed on the second sheet-like structure, a notch 205 is formed on the conductive member 203, the notch 205 is arranged around the boss 203, and the conductive member 201 is connected to the outer end surface of the pole 104 , the outer peripheral edge of the turning member 202 is fixed relative to the cover plate 102, the pole 104 is fixedly connected with the cover plate 102, and the pole 104 is formed with an air guide channel connecting the inside of the housing and the current interruption device 200, and the pole 104 is installed in the sealing Connected to the ceramic ring 207 on the cover plate 102, the outer end surface of the ceramic ring 207 is sealed with a conductive ring 216, the outer peripheral edge of the flipping member 202 is sealed and connected to the conductive ring 216, and the pole 104 and the conductive ring 216 pass through the ceramic Ring 207 is insulated. Thus, the transmission and interruption of current can be stably completed.

In this embodiment, an accommodating hole 218 is formed on the outer end surface of the pole 104 , and the outer peripheral edge of the conductive member 201 is fixed on the inner wall of the accommodating hole.

In this embodiment, the notch 205 is elliptical, the boss 203 is circular, and the center of circle of the notch 205 and the center of the boss 203 are staggered along the long axis of the ellipse, and the long axis of the ellipse is in line with the electrode The axes of the terminals are arranged obliquely.

In this embodiment, and the outer periphery of the pole 104 has a radial boss 105, the inner edge of the ceramic ring 207 has a radial support 208 supporting and connecting the radial boss 105, and the radial boss 105 is along the circumference There are a plurality of radial supports 208 arranged at intervals in the circumferential direction, and the plurality of radial bosses correspond to the plurality of radial supports one by one.

In this embodiment, the outer end surface of the ceramic ring 207 is formed into a stepped structure with an inner ring and an outer ring, the pole 104 is embedded and connected to the inner ring, and the outer ring is sealed with a conductive ring 216 insulated from the pole. The outer peripheral edge of the part 202 is fixedly connected to the conductive ring 216, and a transition ring 209 is sealed and connected to the inner end surface of the ceramic ring 207, and the transition ring 209 is sealed and connected to the cover plate 102 so that the ceramic ring 207 and the cover plate 102 are spaced apart. .

In this embodiment, the ceramic ring 207 is hermetically connected to the conductive ring 216 , the pole 104 and the transition ring 209 through ceramic brazing.

In this embodiment, the transition ring 209 has an inner ring and an outer ring forming a Z-shaped structure, and the cover plate is formed with a through hole for the pole 104 to pass through. The end surface of the through hole is a stepped structure, and the inner ring of the transition ring is embedded Supported in a stepped structure.

In this embodiment, an L-shaped notch is formed on the outer end surface of the conductive ring 216, and the outer peripheral edge of the flipping member 202 is embedded and supported in the L-shaped notch, and the outer peripheral edge is sealed and connected by the cap 210 covering the flipping member 202. on the L-shaped seam.

Wherein, in order to complete the assembly of the single battery, as shown in Figures 20 and 21, a lower spacer 107 is connected to the cell 108, and an upper spacer 106 is connected to the bottom of the cover plate 102, and the upper and lower spacers can be made of insulating materials. . Wherein, the single battery 100 also includes an inner connecting piece 110 connected with the cell, and the inner connecting piece 110 extends into between the upper spacer 107 and the lower spacer 106, and in order to transfer current, the lower surface of the pole 104 is formed with a step The stepped portion passes through the cover plate 102 and the upper spacer 106 and snaps to the end of the inner connecting piece 110 . In this way, the transmission of current from the battery core 108 to the pole 104 is completed and the cover plate 102 and the casing 109 are insulated to avoid electrification.

In the battery module provided in this embodiment, the battery module includes a plurality of single cells, at least one of which is the above-mentioned single cell, and the current interruption device 200 extends radially out of the cover plate 102, and the adjacent Between the unit batteries 100, the current interruption device 200 is staggered from the adjacent electrode terminals in the extending direction of the cover plate. In addition, between adjacent single cells 100, the current interruption device 200 is connected to adjacent electrode terminals through an L-shaped connector 214. The L-shaped connector 214 has a covering portion 211 and a lead-out portion 212. The covering portion 211 is covered and connected to the current interruption device 200, and the lead-out part 212 extends to the adjacent electrode terminal.

In addition, this embodiment also provides a power battery, which is characterized in that the power battery includes a package body and a battery module accommodated in the package body, the battery module group is the above-mentioned battery module group, and a device for detecting A gas detection device for combustible gas is provided adjacent to the current interruption device for providing combustible gas signals for the charge and discharge protection system. In addition, considering the cost and effect, it is only necessary to have a current interruption device in the battery module.

The above describes a single battery with a current interruption device or an explosion-proof valve, wherein the current interruption device or the explosion-proof valve is a safety measure realized by its own mechanical structure. In the following, the present invention will introduce the power battery including the charge and discharge protection system in detail, so as to improve safety through electronic control.

As shown in FIG. 19 , the present invention provides a power battery, which may be the above-mentioned power battery with a current interruption device, an explosion-proof valve or other types. Wherein, the power battery includes a package body and a plurality of single cells 100 accommodated in the package, wherein the plurality of single cells 100 form a battery module in series or parallel, for example, wherein the package is provided with a device for detecting The gas detection device 300 for combustible gas in the power battery, such as a gas sensor, provides a signal for whether to cut off the charging and discharging circuit of the power battery.

Wherein, the charging and discharging protection system included in the power battery includes not only the above-mentioned gas detection device 300 located in the power battery, but also a control device 400 and a current on-off device.

Wherein, the gas detection device 300 feeds back the combustible gas signal to the control device 400, and the control device 400 is used to control the current channel device to cut off the charging and discharging circuit of the power battery according to the combustible gas signal. That is, the safety in the present invention is automatic control by detecting whether there is combustible gas in the package. Among them, when the battery is in a dangerous state such as overcharge, flammable gas will be generated inside, and this part of the gas will leak into the package more or less through various methods. At this time, the gas detection device, such as an airtight sensor, can detect flammable gas The gas is fed back to the control device, and the control device determines whether to cut off the charging and discharging circuit of the power battery according to whether or not the combustible gas is detected or the amount of combustible gas detected. When combustible gas is detected, or the amount of combustible gas exceeds a preset threshold, the circuit channel device can be controlled to cut off the charging and discharging circuit of the power battery, so as to ensure the safety of the power battery.

In order to further reduce security risks. The power battery also includes an alarm device 500 controlled by the control device 400, which can prompt relevant personnel to evacuate the scene through voice, flashing lights, sirens and other alarm devices, thereby reducing potential safety hazards.

As shown in FIG. 19 , the control device 400 includes a host computer main control chip 401 of the power battery and a control module 402 signally connected to the main control chip, and the control module 402 is signally connected to the circuit on-off device. The current on-off device can be a relay 403 located in the charging and discharging circuit, which is controlled by the control module 402 to cut off the charging and discharging circuit. In addition, the alarm device 500 can be directly connected to the host computer control chip 401 to receive an alarm command and alarm.

In the specific working process, the acquisition signal of the gas sensor can be processed by digital-to-analog conversion, sampling and storage, etc. In addition, the fault judgment of the system can be carried out. When the system does not fail, the collected signal can be further analyzed for gas concentration Therefore, it is judged whether the leakage of combustible gas has occurred, and when the leakage concentration of combustible gas exceeds the threshold value, the main control chip 401 of the upper computer will cut off the current and give an alarm.

Wherein, in this embodiment, the gas detection device is arranged outside the single battery, and the combustible gas can be released after being broken through the above-mentioned current interruption device or the notch in the explosion-proof valve. In addition, as long as the gas can be released, it is also It can be vented through various conventional explosion-proof valves known to those skilled in the art. That is, in the battery module, at least one single battery is provided with a current interruption device that cuts off the charging and discharging circuit under the action of the internal gas pressure of the single battery, that is, the aforementioned current interruption devices. And the current interruption device can make the gas in the casing leak out in the cut-off state. Therefore, the gas detection device in the package can detect the leaked combustible gas, which means that the battery has been overcharged and other dangerous situations. In addition, in order to improve the sensitivity of the system, preferably, the gas detection device is arranged adjacent to the current interruption device, so that the corresponding signal can be detected in time after the combustible gas is released and fed back to the control device. In addition, in addition to the current interruption device, in some embodiments, at least one single battery is provided with an explosion-proof valve capable of releasing gas under the action of gas pressure inside the single battery, such as the explosion-proof valve in the third embodiment, At this time, the gas detection device may be arranged adjacent to the explosion-proof valve.

In this embodiment, in order to realize the above-mentioned gas leakage, the current interrupting device in each of the above-mentioned embodiments has a cover, and air holes 213 are formed on the cover so that the gas in the casing can flow between the turning member and the conductive member. Leakage after electrical disconnection. In addition, the air hole on the cover can also directly establish a pressure difference between the current interruption device and the atmosphere, thereby realizing the action of the flipping member. The cover here may be the cap 210 in the first embodiment, or the connecting member 1210 in the second embodiment, or the protective film 2099 in the third embodiment. Therefore, after the corresponding score is pulled off, the gas can be released through, for example, the air hole 213 in the first embodiment, so that the combustible gas leaked into the bag can be detected in time by the gas detection device.

The five implementations of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details of the above-mentioned implementations. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention. , these simple modifications all belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be described separately.

In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Finally, the research and development background introducing the above-mentioned inventive concept of the present invention is described:

With the increasing environmental pollution, the development of new energy vehicles has become a new national strategic plan, and hybrid or pure electric vehicles in new energy vehicles occupy the mainstream of the current automobile market. In the field of electric vehicles, the cruising range is currently It is the main factor restricting the development, and it depends on the energy density of the cell. At present, the main cell materials in the market are ternary and lithium iron phosphate. The former has high energy density, but poor safety performance, especially when overcharging It will cause fire and explosion, which is a big challenge for the automotive industry with strict safety performance requirements.

However, the increase in battery capacity will bring higher mileage, which makes it necessary for everyone to adopt a certain improvement plan for the safety performance of ternary materials to ensure its safety. However, it is difficult to make further improvements due to the performance of materials. We can only think of a way from the structural side.

As mentioned in the background technology, the existing battery pack design basically uses the BMS (Battery Management System) to control the voltage and current temperature of the battery cells in the module, but in the actual use process, the consistency of the battery cells and the management software The reliability still has certain occasional risks. Specifically, referring to people's usage habits of mobile devices, for electric vehicles, the public generally has the situation of plugging in the car body and charging it all the time. Failure or other abnormalities will cause the risk of overcharging the cells in the inclusion circuit. Therefore, the inventor of the present invention thinks that a mechanical protection design can be designed for the battery, so as to avoid the safety risk of the battery caused by software failure.

For mechanical protection measures, the inventors of the present invention have creatively found that the timing of current interruption of the battery in dangerous states such as overcharging is actually regular, that is, the internal air pressure can be used when dangerous states such as overcharging occur. According to the rising principle, a current interruption device or an explosion-proof valve that can interrupt the current of the electrode terminal is designed, so that the input or output of the electrode terminal can be controlled to ensure safety.

In addition, since the capacity of power batteries used in automobiles is generally ten times that of 3C batteries, and the passing current is dozens or even hundreds of times that of small batteries, it is also required that this chip must be able to pass a large current, and Due to the use environment, its weather resistance and sealing requirements are more stringent, and these problems are combined to form the technical solutions in the above-mentioned embodiments of the present invention. And it has been verified by experiments that the current interruption device or the explosion-proof valve in each embodiment of the present invention can cut off the current of the battery in time, thereby effectively improving safety.

Claims (16)

1. A single battery, the single battery (100) comprising a casing, an electric core accommodated in the casing, an electrode terminal (101) electrically connected to the electric core, and a cover plate (102) encapsulating the casing, The electrode terminal (101) is arranged on the cover plate (102), characterized in that the electrode terminal includes a pole (104) passing through the cover plate (102) and electrically connected to the battery core , the single battery further includes a current interruption device (200) installed on the pole (104), and the current interruption device (200) communicates with the internal gas of the casing, Wherein the current interrupting device (200) has a conductive member (201) and an inverting member (202) connected to the conductive member (201) to be electrically connected to each other, and the inverting member (202) and the conductive member (201 ) can break the electrical connection under the action of air pressure, wherein the conductive member (201) is connected to the pole (104) to be electrically connected to each other, The pole (104) is mounted on a ceramic ring (207) that is sealed and connected to the cover plate (102), and the periphery of the outer end of the pole (104) has a radial boss (105), so The inner edge of the ceramic ring (207) has a radial support (208) supporting and connecting the radial boss (105). A plurality of radial supports (208) are arranged at intervals along the circumferential direction, and the plurality of radial bosses correspond to the plurality of radial supports one by one. 2. The single battery according to claim 1, characterized in that, the radial bosses (104) are three or four arranged at equal intervals. 3. The single battery according to claim 1, characterized in that, an accommodation hole (218) is formed on the outer end surface of the pole (104), and the outer peripheral edge of the conductive member (201) is fixed on this on the inner wall of the receiving hole. 4. The single battery according to claim 3, characterized in that, the pole (104) is formed with an air guide hole connecting the inside of the casing and the current interruption device (200), and the air guide hole The channel includes an air guide hole (103) connecting the receiving hole and the interior of the single battery (100). 5. The single battery according to claim 1, characterized in that, the flipping member (202) is connected to the conductive member (201) through a boss welding structure, and the boss welding structure includes a boss (203) , a connection hole (204) for accommodating the boss (203), and an annular welding spot (217) between the boss (203) and the connection hole (204). 6. The single battery according to claim 5, characterized in that, the flipping member (202) is formed as a first sheet structure, and the connecting hole (204) is formed on the first sheet structure, so that The conductive member (201) is formed into a second sheet structure, and the boss (203) is formed on the second sheet structure. 7. The single battery according to any one of claims 1-6, characterized in that, a notch (205) is formed on the conductive member (203), and the notch (205) surrounds the conductor for connecting the The connection point setting of the flipping member (202) is described. 8. The single battery according to claim 7, characterized in that, the notch (205) is oval, the connection point is a circular connection point, and the center of the notch (205) is in line with the The centers of the connecting points are staggered along the long axis of the ellipse. 9. The single battery according to claim 1, characterized in that, the outer end surface of the ceramic ring (207) is formed into a stepped structure with an inner ring and an outer ring, and the pole (104) is embedded and connected to the on the inner circle. 10. The single battery according to claim 9, characterized in that a conductive ring (216) is sealed and connected to the outer end surface of the ceramic ring (207), and the outer peripheral edge of the flipping member (202) is fixedly connected to On the conductive ring (216), the conductive ring (216) is sealed and connected to the outer ring to be insulated from the pole (104). 11. The single battery according to claim 10, characterized in that a transition ring (209) is sealingly connected to the inner end surface of the ceramic ring (207), and the transition ring (209) is sealingly connected to the cover plate (102) such that the ceramic ring (207) is spaced apart from the cover plate (102). 12. The single battery according to claim 11, characterized in that, the transition ring (209) has an inner ring and an outer ring forming a Z-shaped structure, and the cover plate is formed for the pole (104) The end surface of the through hole is a step structure, and the inner ring of the transition ring is embedded and supported in the step structure. 13. The single battery according to claim 10, characterized in that, the outer end surface of the conductive ring (216) is formed with an L-shaped notch, and the outer peripheral edge of the flipping member (202) is embedded and supported on the L-shaped notch. and the outer peripheral edge is sealed and connected to the L-shaped seam through the cap (210) covering the flipping member (202). 14. A battery module, characterized in that the battery module comprises the single battery according to any one of claims 1-13. 15. A power battery, comprising an enclosure and a battery module disposed in the enclosure, wherein the battery module is the battery module according to claim 14. 16. An electric vehicle, characterized in that the electric vehicle is provided with the power battery according to claim 15.