WO2025247123A1 - Structure antidéflagrante, batterie et dispositif électrique - Google Patents

Structure antidéflagrante, batterie et dispositif électrique

Info

Publication number
WO2025247123A1
WO2025247123A1 PCT/CN2025/097052 CN2025097052W WO2025247123A1 WO 2025247123 A1 WO2025247123 A1 WO 2025247123A1 CN 2025097052 W CN2025097052 W CN 2025097052W WO 2025247123 A1 WO2025247123 A1 WO 2025247123A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
notch
explosion
proof
pressure relief
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2025/097052
Other languages
English (en)
Chinese (zh)
Inventor
颜文清
龙慧斌
王镭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Minth Automotive Parts Research and Development Co Ltd
Original Assignee
Ningbo Minth Automotive Parts Research and Development Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202410696858.XA external-priority patent/CN118539082A/zh
Priority claimed from CN202422518533.0U external-priority patent/CN223598830U/zh
Application filed by Ningbo Minth Automotive Parts Research and Development Co Ltd filed Critical Ningbo Minth Automotive Parts Research and Development Co Ltd
Publication of WO2025247123A1 publication Critical patent/WO2025247123A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the embodiments of the present invention relate to, but are not limited to, the field of battery technology. Specifically, they relate to an explosion-proof structure, a battery, and an electrical device.
  • An explosion-proof valve is a safety component for lithium batteries. It is usually installed on the battery casing/cover. When the pressure inside the battery exceeds the opening pressure of the explosion-proof valve, the valve opens to release the high-pressure gas inside the battery, preventing the internal pressure of the battery from continuing to increase, thereby delaying the progression of battery runaway and reducing the degree of battery pack runaway.
  • embodiments of the present invention disclose an explosion-proof structure, including a body, wherein explosion-proof markings are provided on the outer surface of the body, and the area enclosed by the explosion-proof markings forms a pressure relief area;
  • the explosion-proof markings include a first marking, a second marking, and a third marking.
  • the second marking and the third marking are provided at both ends of the first marking.
  • the second marking and the third marking are located on both sides of the first marking.
  • the ends of the second marking and the third marking meet at the end of the first marking.
  • the lengths of the second marking and the third marking are respectively less than the length of the first marking.
  • the pressure relief area includes a first pressure relief area and a second pressure relief area.
  • the area enclosed by the first notch and the second notch located at both ends of the first notch forms the first pressure relief area, and the area enclosed by the first notch and the third notch located at both ends of the first notch forms the second pressure relief area.
  • the explosion-proof markings further include a fourth marking and a fifth marking.
  • the fourth marking is located on the side of the second marking away from the third marking and is connected to the end of the second marking away from the first marking.
  • the fifth marking is located on the side of the third marking away from the second marking and is connected to the end of the third marking away from the first marking.
  • the first marking and the second marking, the first marking and the third marking, the second marking and the third marking, the fourth marking and the second marking, and the fifth marking and the third marking are all set at an angle.
  • the length of the fourth marking is less than the length of the second marking
  • the length of the fifth marking is less than the length of the third marking.
  • the inner surface of the body is provided with guide marks, and the area enclosed by the guide marks and the explosion-proof marks together forms the pressure relief area.
  • the guide marks are arranged parallel to the first mark, and a guide mark is provided on each side of the first mark.
  • the outer surface of the body is further provided with a first extended groove, each free end of the explosion-proof groove is connected to the first extended groove, and the first extended groove extends from the end away from the explosion-proof groove to the position of the end of the corresponding guide groove.
  • the inner surface of the body is further provided with a second extended groove, the two ends of the guide groove are respectively connected to the second extended groove, and the end of the second extended groove away from the guide groove extends to the location of the free end of the corresponding explosion-proof groove.
  • the first pressure relief area is provided with a first reinforcing structure
  • the second pressure relief area is provided with a second reinforcing structure.
  • the first reinforcing structure is formed by the first pressure relief area protruding towards the inner side of the body, or by the first pressure relief area protruding towards the outer side of the body.
  • the second reinforcing structure is formed by the second pressure relief area protruding towards the inner side of the body, or by the second pressure relief area protruding towards the outer side of the body.
  • the inner side of the body is the side where the inner surface of the body is located
  • the outer side of the body is the side where the outer surface of the body is located.
  • the first pressure relief area is further provided with a first reinforcing groove, which divides the first reinforcing structure into a first boss portion, a second boss portion and a third boss portion.
  • the first boss portion is provided along the edge of the second groove located at one end of the first groove and a portion of the edge of the first groove.
  • the second boss portion is provided along the edge of the second groove located at the other end of the first groove and another portion of the edge of the first groove.
  • the third boss portion extends in a direction parallel to the first groove and is located on the side of the first boss portion and the second boss portion away from the second reinforcing structure.
  • the first reinforcing groove includes a first groove, a second groove, and a third groove.
  • the gap between the first boss and the third boss constitutes the first groove
  • the gap between the second boss and the third boss constitutes the second groove
  • the gap between the first boss and the second boss constitutes the third groove.
  • the third groove corresponds to the middle position of the first groove, and the first groove and the second groove meet at the third groove.
  • the first pressure relief area is further provided with a third reinforcing groove, which is located at the bottom of the first reinforcing groove and extends along the extension direction of the first reinforcing groove.
  • the ratio of the length a of the first notch to the length b of the second notch is between 12 and 13, and/or the ratio of the length a of the first notch to the length d of the fourth notch is between 29 and 30, and/or the angle ⁇ formed by the second notch and the third notch is between 80° and 160°, and/or the angle ⁇ formed by the second notch and the fourth notch is between 60° and 140°, and/or the angle ⁇ formed by the fourth notch and the first extended notch is between 100° and 180°, and/or the remaining material t of the body at the explosion-proof notch is between 0.05 mm and 0.15 mm.
  • Explosion-proof grooves can be provided on the outer surface of the main body, such as a battery casing or battery cover.
  • the area enclosed by these grooves forms a pressure relief area, which acts as an explosion-proof valve for venting and releasing pressure. This not only reduces the processing and assembly steps of the explosion-proof valve parts, improving production efficiency and product qualification rate, but also eliminates the need for additional thinning of the central area of the explosion-proof valve to facilitate its cracking, thereby improving the utilization rate of the main body material.
  • the pressure relief area is composed of two pressure relief areas. This allows the two pressure relief areas to protect the surrounding battery cells, preventing splashes of substances such as high-temperature airflow and electrolyte from reaching the surrounding battery cells, thereby reducing the degree of contamination to the surrounding battery cells after the pressure relief area is opened.
  • the structural strength of the body at the second and third notches is greater than that at the first notch.
  • the pressure relief area when the pressure relief area is impacted by the internal pressure of the battery, it can crack first at the first notch. After the first notch is completely cracked, if the pressure relief area continues to be under pressure, it can continue to crack along the second and third notches, allowing it to tear from the center outwards.
  • embodiments of the present invention disclose an explosion-proof structure, including a body, wherein the body is provided with explosion-proof markings and guide markings;
  • the explosion-proof markings include a first marking and two second markings.
  • the two ends of the first marking are respectively provided with the second markings.
  • the second markings are set at an angle to the first marking, and the two second markings are located on the same side of the first marking.
  • the area enclosed by the line connecting the ends of the two second notches furthest from the first notch, the first notch, and the two second notches constitutes the pressure relief area.
  • the guide mark coincides with the connecting line, or the guide mark is located on the side of the connecting line away from the pressure relief area.
  • the body has opposing outer and inner surfaces
  • the guide marking is located on the outer surface, and the explosion-proof marking is located on the outer surface; or, the guide marking is located on the outer surface, and the explosion-proof marking is located on the inner surface; or, the guide marking is located on the inner surface, and the explosion-proof marking is located on the outer surface; or, the guide marking is located on the inner surface, and the explosion-proof marking is located on the inner surface.
  • the guide groove is a groove structure formed on the body, the groove structure has an opening, the width of the guide groove at the opening is between 0.5 mm and 2.0 mm, the included angle is between 15 degrees and 30 degrees, and the residual thickness of the body at the guide groove is between 0.15 mm and 0.3 mm.
  • the body includes a flat portion and a recessed portion.
  • the body is recessed inward toward the interior of the body at the explosion-proof marking to form the recessed portion.
  • the surface of the recessed portion does not protrude from the plane where the flat portion is located.
  • the explosion-proof marking and the guide marking are disposed on the recessed portion.
  • the body includes a flat portion and a boss portion, the body protruding outward from the explosion-proof marking to form the boss portion, the surface of the boss portion protruding beyond the plane of the flat portion, and the explosion-proof marking and the guide marking are provided on the boss portion.
  • the explosion-proof markings further include two third markings, with the third markings corresponding to both ends of the first marking.
  • the third markings and the second marking are located on both sides of the first marking, and the third markings and the second marking are set at an angle and their ends meet at the end of the first marking.
  • the body is provided with two guide markings, with one guide marking symmetrically provided on both sides of the first marking.
  • the depth of the guide groove is less than the depth of the explosion-proof groove
  • the groove depth of the second groove is greater than or equal to the groove depth of the first groove
  • the groove depth of the third groove is greater than or equal to the groove depth of the first groove
  • the included angle ⁇ formed by the second and third notches is between 80° and 160°.
  • An explosion-proof structure can be provided on, for example, the casing or cover of a battery.
  • the explosion-proof markings and guide markings of the explosion-proof structure can be located on the main body.
  • the explosion-proof markings mainly include a first marking and two second markings.
  • the guide markings and the explosion-proof markings can be located on the same surface or opposite surfaces of the main body. Second markings are respectively provided at both ends of the first marking. Therefore, the area enclosed by the line connecting the ends of the two second markings away from the first marking, the first marking, and the two second markings is the pressure relief area of the explosion-proof structure during explosion venting operations.
  • an explosion-proof membrane can be formed in the pressure relief area of the explosion-proof structure, integrally molded onto the battery casing or cover as an explosion-proof membrane for venting and depressurizing. This not only reduces the parts processing and assembly steps of the explosion-proof structure, improving production efficiency and product qualification rate, but also eliminates the need for additional thinning of the central area of the explosion-proof structure to facilitate cracking, thereby improving the utilization rate of the main body material.
  • embodiments of the present invention disclose a battery including the explosion-proof structure described above.
  • embodiments of the present invention disclose an electrical device, including the explosion-proof structure described above, or including the battery described above.
  • Figure 1 is a front structural schematic diagram of the explosion-proof structure in the first embodiment of the present invention
  • Figure 2 is a magnified view of part A in Figure 1;
  • Figure 3 is a cross-sectional view at point B-B in Figure 1;
  • Figure 4 is a cross-sectional view at point C-C in Figure 1;
  • Figure 5 is a schematic diagram of the reverse side structure of the explosion-proof structure in the first embodiment of the present invention.
  • Figure 6 is a magnified view of part D in Figure 5;
  • Figure 7 is a schematic diagram of the structure of the pressure relief area cracking on the battery casing in the first embodiment of the present invention.
  • Figure 8 is a schematic diagram of the structure of the pressure relief area cracking on the battery cover in the first embodiment of the present invention.
  • Figure 9 is a schematic diagram of the cross-sectional structure of the explosion-proof groove in the first embodiment of the present invention.
  • Figure 10 is a schematic diagram of another case of the cross-sectional structure of the explosion-proof groove in the first embodiment of the present invention.
  • Figure 11 is a schematic diagram of the explosion-proof groove structure in the first embodiment of the present invention.
  • Figure 12 is a structural schematic diagram of another case of explosion-proof markings in the first embodiment of the present invention.
  • Figure 13 is a structural schematic diagram of another case of explosion-proof markings in the first embodiment of the present invention.
  • Figure 14 is an isometric structural diagram of the explosion-proof structure in the second embodiment of the present invention.
  • Figure 15 is one of the front structural schematic diagrams of the explosion-proof structure in the second embodiment of the present invention.
  • Figure 16 is a schematic cross-sectional view at point E-E in Figure 14;
  • Figure 17 is a schematic diagram of the structure of the explosion-proof markings and guide markings on the outer surface of the body in the second embodiment of the present invention.
  • Figure 18 is a schematic diagram of the structure in the second embodiment of the present invention, in which the guide marks are located on the outer surface of the body;
  • Figure 19 is a schematic diagram of the structure of the explosion-proof grooves on the inner surface of the body in the second embodiment of the present invention.
  • Figure 20 is a schematic diagram of the structure of the explosion-proof markings and guide markings located on the inner surface of the body in the second embodiment of the present invention.
  • Figure 21 is a schematic diagram of the structure of the explosion-proof grooves on the outer surface of the body in the second embodiment of the present invention.
  • Figure 22 is a schematic diagram of the structure in the second embodiment of the present invention, in which the guide marks are located on the inner surface of the body;
  • Figure 23 is one of the side structural schematic diagrams of the explosion-proof structure in the second embodiment of the present invention.
  • Figure 24 is an enlarged structural diagram of point F in Figure 23;
  • Figure 25 is a second side view of the explosion-proof structure in the second embodiment of the present invention.
  • Figure 26 is an enlarged structural diagram of point G in Figure 25;
  • Figure 27 is a front structural diagram of the explosion-proof structure in the second embodiment of the present invention.
  • the Z-axis represents the vertical direction, i.e., up and down, with the positive direction of the Z-axis representing upward and the negative direction representing downward.
  • the X-axis represents the horizontal direction and is designated as front and back, with the positive direction of the X-axis representing the front and the negative direction representing the back.
  • the Y-axis represents the left and right position, with the positive direction of the Y-axis representing the left and the negative direction representing the right.
  • this embodiment of the invention provides an explosion-proof structure, including a body 1.
  • Explosion-proof markings 12 are provided on the outer surface of the body 1, and the area enclosed by the explosion-proof markings 12 forms a pressure relief area 2.
  • the explosion-proof markings 12 include a first marking 121, a second marking 122, and a third marking 123.
  • the second marking 122 and the third marking 123 are provided at both ends of the first marking 121, respectively located on both sides of the first marking 121.
  • the pressure relief region 2 includes a first pressure relief region 21 and a second pressure relief region 22.
  • the region enclosed by the first mark 121 and the second mark 122 located at both ends of the first mark 121 forms the first pressure relief region 21, and the region enclosed by the first mark 121 and the third mark 123 located at both ends of the first mark 121 forms the second pressure relief region 22.
  • explosion-proof structures are commonly used in lithium batteries, and the battery casing typically includes an open shell and a cover plate covering the open shell.
  • the open shell can be located at the top, side, or bottom of the shell; that is, the battery cover plate can be the top cover plate, side cover plate, or bottom cover plate.
  • the body 1 of the explosion-proof structure can be the battery cover plate, as shown in Figure 8, or it can be the battery casing, as shown in Figure 7.
  • the portion of the body 1 at the pressure relief region 2 can be defined as an explosion-proof diaphragm flap, i.e., the explosion-proof diaphragm flap is integrally formed with the body 1.
  • the pressure relief region 2 is used to rupture along the explosion-proof notch 12 when the internal pressure of the battery exceeds the pressure that the explosion-proof notch 12 can withstand, to form a vent 100 connecting the internal and external spaces of the battery, as shown in Figures 7 and 8.
  • the first pressure relief region 21 and the second pressure relief region 22 can be defined as the first valve and the second valve, respectively.
  • the location of the pressure relief area 2 on the battery can be selected according to the battery's layout space.
  • the pressure relief area 2 can be placed at the top, left, right, or bottom of the battery casing.
  • the body 1 is the battery casing. If burst venting is required at the front or rear of the battery, the pressure relief area 2 can be placed on the battery cover. In this case, the body 1 is the battery cover.
  • the outer surface of the body 1 refers to the surface of the body 1 facing the external space of the battery; correspondingly, the outer surface of the body 1 refers to the surface of the body 1 facing the internal space of the battery.
  • the explosion-proof notch 12 is typically a semi-enclosed structure.
  • the area enclosed by the explosion-proof notch 12 is the area enclosed by the semi-enclosed structure, also known as the pressure relief area 2.
  • the explosion-proof notch 12 is the connection structure between the pressure relief area 2 and the main body 1. This allows the explosion-proof diaphragm flap to connect with the main body 1 after it breaks, preventing it from flying off.
  • the explosion-proof notch 12 is typically a groove structure, and this groove structure can be formed by stamping on the main body 1 or by removing part of the structure of the main body 1. In practical applications, it is usually preferred to form the explosion-proof notch 12 by stamping.
  • the explosion-proof notch 12 mainly includes a first notch 121, two second notches 122, and two third notches.
  • the two second notches 122 are respectively located at the front and rear ends of the first notch 121 (i.e., the first notch 121 is located at both ends in the X-axis direction in Figure 1).
  • the two third notches 123 are also respectively located at the front and rear ends of the first notch 121.
  • the two second notches 122 are located on the left side of the first notch 121 (i.e., the first notch 121 is located on the positive Y-axis side in Figure 1), and the two third notches 123 are located on the right side of the first notch 121 (i.e., the first notch 121 is located on the opposite Y-axis side in Figure 1).
  • the ends of the second notches 122 and the third notches 123 located at the front end of the first notch 121 meet at the front end of the first notch 121
  • the ends of the second notches 122 and the third notches 123 located at the rear end of the first notch 121 meet at the rear end of the first notch 121.
  • the first notch 121 can be a straight groove, a wavy groove, or a serrated groove extending along a set direction. In practical applications, for ease of processing, a straight groove is usually preferred for the first notch 121.
  • the set direction can be the length direction of the body 1 (i.e., the X-axis direction in Figure 1) or the width direction (i.e., the Y-axis direction in Figure 1).
  • the shape of the second notch 122 can be oblique, U-shaped, C-shaped, etc.
  • the shapes of the second notch 122 and the third notch 123 can be the same or different.
  • the second notch 122 and the third notch 123 are usually symmetrically arranged on the left and right sides of the first notch 121.
  • the second notch 122 and the third notch 123 are oblique and symmetrically arranged.
  • the second notch 122 and the third notch 123 are U-shaped and symmetrically arranged.
  • the area enclosed by the first notch 121 and the two second notches 122 forms the first pressure relief zone 21, and the area enclosed by the first notch 121 and the two third notches 123 forms the second pressure relief zone 22.
  • the pressure relief zone 2 being composed of two pressure relief zones (i.e., the first pressure relief zone 21 and the second pressure relief zone 22), with the first notch 121 located at the center of the entire pressure relief zone 2. Since the length of the notch affects the structural strength of the body 1 at the notch location—for example, the longer the notch, the weaker the structural strength at that location—the lengths of the second notches 122 and the third notches 123 are set to be less than the length of the first notch 121.
  • the first notch 121 located at the center, becomes the weakest point in the pressure relief zone 2, facilitating a central cracking of the pressure relief zone 2.
  • the pressure relief area 2 can first crack from the first notch 121.
  • the pressure relief area 2 can continue to crack along the second notch 122 and the third notch 123, so that the pressure relief area 2 can be torn from the center to both sides, so that the pressure relief area 2 can be opened in the preset direction.
  • the explosion-proof structure can be achieved by providing explosion-proof grooves 12 on the outer surface of the body 1, such as the battery casing or battery cover.
  • the area enclosed by the explosion-proof grooves 12 forms a pressure relief area 2, which serves as an explosion-proof valve for venting and relieving pressure. This not only reduces the parts processing and assembly steps of the explosion-proof valve, improving production efficiency and product qualification rate, but also eliminates the need for additional thinning of the central area of the explosion-proof valve to facilitate its cracking, thereby improving the utilization rate of the body 1 material.
  • the pressure relief zone 2 is composed of two pressure relief zones, so as to protect the surrounding cells by using the two pressure relief zones and prevent things such as high-temperature airflow and electrolyte from splashing onto the surrounding cells, thereby reducing the degree of contamination of the surrounding cells after the pressure relief zone 2 is opened.
  • the structural strength of the body 1 at the second notch 122 and the structural strength of the body 1 at the third notch 123 are both greater than the structural strength of the body 1 at the first notch 121, so that the first notch 121 located at the center becomes the weakest point of the pressure relief region 2, so that the pressure relief region 2 can crack in the center.
  • the pressure relief area 2 when the pressure relief area 2 is impacted by the internal air pressure of the battery, the pressure relief area 2 can first crack from the first notch 121.
  • the pressure relief area 2 can continue to crack along the second notch 122 and the third notch 123, so that the pressure relief area 2 can tear from the center to both sides.
  • This not only ensures that the explosion-proof notch 12 can crack according to the preset explosion sequence, thereby realizing that the pressure relief area 2 opens in a fixed direction, but also the design of the two pressure relief areas makes the height of the pressure relief area 2 after opening half that of a traditional explosion-proof valve of the same cross section. This can reduce the clearance height of the battery, thereby reducing the height of, for example, the car chassis, improving the space utilization of the battery and the overall vehicle range.
  • the second notch 122 and the third notch 123 are symmetrically arranged on both sides of the first notch 121.
  • This arrangement simplifies the processing of the explosion-proof notch 12 and improves production efficiency.
  • it makes the first pressure relief area 21 and the second pressure relief area 22 of the pressure relief area 2 symmetrical, so that the left and right pressure relief areas of the pressure relief area 2 can be torn open simultaneously and synchronously, thereby quickly forming the vent hole 100 for venting and pressure relief.
  • the second notch 122 and the third notch 123 form a V-shaped structure.
  • both the second notch 122 and the third notch 123 are oblique groove structures, so that the second notch 122 and the third notch 123 together form a V-shaped structure.
  • the remaining material thickness t of the body 1 at the explosion-proof notch 12 is ⁇ 0.04mm, and/or, the length L of the explosion-proof notch 12 is ⁇ 36mm, and/or, the length b of the second notch 122 is ⁇ 6mm, and/or, the length c of the third notch 123 is ⁇ 6mm, and/or, the sum e of the vertical distance from the end of the second notch 122 away from the first notch 121 to the first notch 121 and the vertical distance e of the end of the third notch 123 away from the first notch 121 to the first notch 121 is ⁇ 9mm, and/or, the included angle ⁇ formed by the second notch 122 and the third notch 123 is ⁇ 90°.
  • t is set to be greater than or equal to 0.04 mm to ensure that the connection between the pressure relief area 2 and the main body 1 has a certain strength and to avoid the failure of the pressure relief area 2.
  • L is set to be greater than or equal to 36mm to ensure that the vent hole 100 formed after the pressure relief area 2 cracks has a sufficiently large opening area, so that the high-temperature gas inside the battery can be discharged quickly, thereby improving the explosion-proof effect.
  • c is set to be greater than or equal to 6 mm to increase the tearing range of the pressure relief region 2 and ensure that the vent 100 formed after the pressure relief region 2 cracks has a sufficiently large opening area, so that the high-temperature gas inside the battery can be quickly discharged, thereby improving the explosion-proof effect.
  • the vertical distance e from the end of the second notch 122 away from the first notch 121 (i.e., the free end of the second notch 122) to the first notch 121 and the vertical distance e from the end of the third notch 123 away from the first notch 121 (i.e., the free end of the third notch 123) to the first notch 121 is set too small, or if the included angle ⁇ formed by the second notch 122 and the third notch 123 is set too small, the area of the left and right pressure relief zones of the pressure relief zone 2 will be small, resulting in a small vent hole 100 formed after the pressure relief zone 2 cracks.
  • e is set to be greater than or equal to 9 mm, and/or ⁇ is set to be greater than or equal to 90° to ensure that the vent hole 100 formed after the pressure relief zone 2 cracks has a sufficiently large opening area, so that the high-temperature gas inside the battery can be quickly discharged, thereby improving the explosion-proof effect.
  • At least one of the second notch 122 and the third notch 123 is U-shaped, the first notch 121 is connected to one of the vertical sides of the U-shaped structure, and the openings of the U-shaped structure at both ends of the first notch 121 are arranged opposite to each other.
  • At least one of the second groove 122 and the third groove 123 has a U-shaped groove structure, so that the explosion-proof groove 12 is generally composed of two back-to-back C-shaped grooves, which is not only simple in structure, but also convenient to process.
  • the inner surface of the body 1 is provided with guide marks 13.
  • the area enclosed by the guide marks 13 and the explosion-proof marks 12 forms a pressure relief area 2.
  • the guide marks 13 are arranged parallel to the first marks 121.
  • a guide mark 13 is provided on each side of the first marks 121.
  • the first pressure relief area 21 and the second pressure relief area 22 are respectively used to fold outward at the corresponding guide marks 13.
  • a guide mark 13 is provided on each of the left and right sides of the explosion-proof mark 12. Moreover, the structural strength of the body 1 at the guide mark 13 is greater than the structural strength at the explosion-proof mark 12. At the same time, the structural strength at the guide mark 13 is sufficient to ensure that the pressure relief area 2 only folds over at the guide mark 13 without cracking. In this way, by providing the guide mark 13 on the inner surface of the body 1, the first pressure relief area 21 and the second pressure relief area 2 of the pressure relief area 2 can fold outward at the corresponding guide mark 13, so that the pressure relief area 2 can be fully opened under the guidance of the guide mark 13 when subjected to a large air pressure impact.
  • the outer surface of the body 1 is further provided with a first extended groove 14, and each free end of the explosion-proof groove 12 is connected to the first extended groove 14, and the first extended groove 14 extends from the end away from the explosion-proof groove 12 to the position of the end of the corresponding guide groove 13.
  • the inner surface of the body 1 is also provided with a second extended groove 15, the two ends of the guide groove 13 are respectively connected to the second extended groove 15, and the end of the second extended groove 15 away from the guide groove 13 extends to the free end of the corresponding explosion-proof groove 12.
  • the explosion-proof marking 12 includes only the first marking 121, the second marking 122, and the third marking 123
  • the ends of the two second markings 122 away from the first marking 121 i.e., the free ends of the second markings 122
  • the ends of the two third markings 123 away from the first marking 121 i.e., the free ends of the third markings 123
  • the free ends of the explosion-proof marking 12 together constitute the free ends of the explosion-proof marking 12.
  • the explosion-proof marking 12 includes the first marking 121, the second marking 122, the third marking 123, the fourth marking 124, and the fifth marking 125
  • the ends of the two fourth markings 124 away from the second marking 122 i.e., the free ends of the fourth markings 12
  • the ends of the two fifth markings 125 away from the third marking 123 i.e., the free ends of the fifth markings 125
  • Each free end of the explosion-proof notch 12 is provided with a first extension notch 14, with one end of the first extension notch 14 connected to the free end of the explosion-proof notch 12 and the other end extending to the position of the end of the corresponding guide notch 13.
  • a second extension notch 15 is provided at both ends of the guide notch 13, with one end of the second extension notch 15 connected to the guide notch 13 and the other end extending to the position of the free end of the explosion-proof notch 12. Furthermore, the material thickness of the body 1 at the first extension notch 14 is generally less than the remaining material thickness at the guide notch 13, but greater than the remaining material thickness at either the first extension notch 14 or the second extension notch 15.
  • the left and right pressure relief areas of the pressure relief area 2 can be further opened under the action of the first extension notch 14 and/or the second extension notch 15, so that the pressure relief area 2 can be fully exploded.
  • the explosion-proof notch 12 further includes a fourth notch 124 and a fifth notch 125.
  • the fourth notch 124 is located on the side of the second notch 122 away from the third notch 123 and is connected to the end of the second notch 122 away from the first notch 121.
  • the fifth notch 125 is located on the side of the third notch 123 away from the second notch 122 and is connected to the end of the third notch 123 away from the first notch 121.
  • the first notch 121 and the second notch 122, the first notch 121 and the third notch 123, the second notch 122 and the third notch 123, the fourth notch 124 and the second notch 122, and the fifth notch 125 and the third notch 123 are all set at an angle.
  • the length of the fourth notch 124 is less than the length of the second notch 122, and the length of the fifth notch 125 is less than the length at the third notch 123.
  • each segment of the explosion-proof notch 12 is a straight groove structure, and adjacent segments are set at an angle.
  • the fourth notch 124 is located at the end of the second notch 122 away from the first notch 121
  • the fifth notch 125 is located at the end of the third notch 123 away from the first notch 121.
  • the first notch 121 can be used as the center notch
  • the second notch 122 and the third notch 123 can be used as the main notches
  • the fourth notch 124 and the fifth notch 125 can be used as auxiliary notches.
  • the length of the main notch is usually less than the length of the center notch and greater than the length of the auxiliary notches, so that the structural strength of the body 1 at the main notch is greater than the structural strength of the body 1 at the center notch and less than the structural strength of the body 1 at the auxiliary notches.
  • the order of explosion of the pressure relief area 2 is the center notch, the main notch, and the auxiliary notch.
  • the area enclosed by the first scribing mark 121, the second scribing mark 122, the fourth scribing mark 124 and the guide scribing mark 13 on one side forms the first pressure relief zone 21, and the area enclosed by the first scribing mark 121, the third scribing mark 123, the fifth scribing mark 125 and the guide scribing mark 13 on the other side forms the second pressure relief zone 22.
  • a fourth mark 124 and a fifth mark 125 are respectively provided at the end of the second mark 122 away from the first mark 121 and the end of the third mark 123 away from the first mark 121.
  • the length of the fourth mark 124 is less than the length of the second mark 122
  • the length of the fifth mark 125 is less than the length of the third mark 123.
  • the pressure relief area 2 when the pressure relief area 2 is impacted by the internal gas pressure of the battery, the pressure relief area 2 can first crack from the first notch 121. After the first notch 121 is completely cracked, if the pressure relief area 2 is still under pressure, the first pressure relief area 21 can continue to crack along the second notch 122 and the fourth notch 124 in sequence, and the second pressure relief area 22 can continue to crack along the third notch 123 and the fifth notch 125 in sequence, so that the explosion-proof pressure of the pressure relief area 2 is set in a step-like manner, ensuring that the explosion-proof notch 12 can crack in the preset explosion sequence, thereby achieving the requirement of explosion-proof pressure stability.
  • the fourth notch 124 and the fifth notch 125 are symmetrically arranged on both sides of the first notch 121.
  • This arrangement simplifies the processing of the explosion-proof notch 12 and improves production efficiency.
  • it makes the first pressure relief area 21 and the second pressure relief area 2 of the pressure relief area 2 symmetrical, so that the left and right pressure relief areas of the pressure relief area 2 can be torn open simultaneously and synchronously, thereby quickly forming the vent hole 100 for venting and pressure relief.
  • the explosion-proof notch 12 has an inverted trapezoidal, V-shaped, or U-shaped cross-section perpendicular to its extension direction.
  • the cross-sectional shape of the explosion-proof notch 12 can be designed according to its shape.
  • the cross-sectional shape of the explosion-proof notch 12 is usually set as a V-shaped structure or a U-shaped structure.
  • the explosion-proof notch 12 consists of a first notch 121, a second notch 122, a third notch 123, a fourth notch 124, and a fifth notch 125, and adjacent notches are set at an angle
  • the cross-sectional shape of the explosion-proof notch 12 is usually set as an inverted trapezoidal structure. In this way, setting the cross-section of the explosion-proof notch 12 as an inverted trapezoidal structure, a V-shaped structure, or a U-shaped structure simplifies the structure and facilitates processing.
  • the length k of the shorter base of the inverted trapezoidal structure is between 0.1 mm and 0.35 mm.
  • k is set between 0.1mm and 0.35mm to ensure that the explosion-proof scoring 12 is both easy to machine and can be easily torn open.
  • the included angle ⁇ between the two sides of the inverted trapezoidal structure is between 30° and 120°.
  • the included angle ⁇ is set too small, it will make the machining of the groove more difficult. If the included angle ⁇ is set too large, it will make the width of the groove (i.e., the size of the explosion-proof groove 12 in the Y-axis direction) larger. Therefore, in this embodiment, the included angle ⁇ is set between 30° and 120° to reduce the width of the explosion-proof groove 12 while ensuring that the explosion-proof groove 12 is easy to machine.
  • the included angle ⁇ of the V-shape is ⁇ 60°. This setting reduces the width of the explosion-proof notch 12 while ensuring ease of processing.
  • a first reinforcing structure 23 is provided on the first pressure relief area 21, and a second reinforcing structure 24 is provided on the second pressure relief area 22.
  • the first reinforcing structure 23 is formed by protruding from the first pressure relief area 21 toward the inner side of the body 1, or by protruding from the first pressure relief area 21 toward the outer side of the body 1.
  • the second reinforcing structure 24 is formed by protruding from the second pressure relief area 22 toward the inner side of the body 1, or by protruding from the second pressure relief area 22 toward the outer side of the body 1.
  • the inner side of the body 1 is the side where the inner surface of the body 1 is located, and the outer side of the body 1 is the side where the outer surface of the body 1 is located.
  • the inner side of the body 1 is also the side of the body 1 facing the internal space of the battery
  • the outer side of the body 1 is also the side of the body 1 facing the external space of the battery.
  • first reinforcing structure 23 protrudes from the first pressure relief area 21 toward the outer side of the body 1
  • a raised reinforcing boss structure is formed on the outer surface of the first pressure relief area 21, while a recessed reinforcing recess structure is formed on the inner surface of the first pressure relief area 21 at the position corresponding to the first reinforcing structure 23.
  • the structure of the second reinforcing structure 24 is usually the same as that of the first reinforcing structure 23, and will not be described again here.
  • the protrusion directions of the first reinforcing structure 23 and the second reinforcing structure 24 can be the same or opposite.
  • the protrusion directions of the first reinforcing structure 23 and the second reinforcing structure 24 are the same, while in another example, the protrusion directions of the first reinforcing structure 23 and the second reinforcing structure 24 are opposite.
  • first reinforcing structure 23 on the first pressure relief area 21 and a second reinforcing structure 24 on the second pressure relief area 22 not only can the structural strength of the pressure relief area 2 be increased, preventing the explosion-proof notch 12 from tearing when the pressure relief area 2 is "breathing” like a diaphragm, but it can also ensure that the left and right pressure relief areas break neatly without deformation when the pressure relief area 2 explodes, so that the pressure relief area 2 can both play a certain role in guiding airflow and protect the surrounding battery cells or surrounding components.
  • first reinforcing structure 23 and the second reinforcing structure 24 are symmetrically arranged in their orthographic projections onto the reference plane 11 of the body 1.
  • the reference plane 11 of the body 1 is typically the outer surface of the body 1 where the pressure relief region 2 is located. This symmetrical arrangement of the first reinforcing structure 23 and the second reinforcing structure 24 simplifies the structure of the pressure relief region 2 and facilitates manufacturing.
  • the first pressure relief area 21 is further provided with a first reinforcing groove 25.
  • the first reinforcing groove 25 divides the first reinforcing structure 23 into a first boss portion 231, a second boss portion 232, and a third boss portion 233.
  • the first boss portion 231 is provided along the edge of the second groove 122 located at one end of the first groove 121 and a portion of the edge of the first groove 121.
  • the second boss portion 232 is provided along the edge of the second groove 122 located at the other end of the first groove 121 and another portion of the edge of the first groove 121.
  • the third boss portion 233 extends in a direction parallel to the first groove 121 and is located on the side of the first boss portion 231 and the second boss portion 232 that is away from the second reinforcing structure 24.
  • the first reinforcing groove 25 includes a first groove 251, a second groove 252 and a third groove 253.
  • the gap between the first boss portion 231 and the third boss portion 233 forms the first groove 251.
  • the gap between the second boss portion 232 and the third boss portion 233 forms the second groove 252.
  • the gap between the first boss portion 231 and the second boss portion 232 forms the third groove 253.
  • the third groove 253 corresponds to the middle position of the first notch 121, and the first groove 251 and the second groove 252 meet at the third groove 253.
  • the inner surface of the first pressure relief area 21 forms a raised reinforcing boss structure, that is, the first boss portion 231, the second boss portion 232 and the third boss portion 233 are located on the inner surface of the first pressure relief area 21, and the first reinforcing groove 25 is also located on the inner surface of the first pressure relief area 21, so that the surface on the outer surface of the first pressure relief area 21 at the position corresponding to the first reinforcing groove 25 is higher than the surface at the position corresponding to the first reinforcing structure 23, which is equivalent to forming a reinforcing rib structure in the shape of a bracket on the outer surface of the first pressure relief area 21 at the position corresponding to the first reinforcing groove 25.
  • first reinforcing groove 25 on the first pressure relief area 21, and using the first reinforcing groove 25 to divide the first reinforcing structure 23 into a first boss portion 231, a second boss portion 232, and a third boss portion 233, the structural strength of the first pressure relief area 21 is further improved.
  • a reinforcing rib structure for example, in the shape of a curly bracket, is formed at the position on the first pressure relief area 21 corresponding to the first reinforcing groove 25, and the third groove 253 corresponds to the apex of the curly bracket shape.
  • the reinforcing rib structure at the third groove 253 can be used to reinforce the middle position of the first notch 121, thereby improving the strength of the large-span first notch 121.
  • the second pressure relief area 22 is also provided with a second reinforcing groove 26, and the first reinforcing groove 25 and the second reinforcing groove 26 are symmetrically arranged on the reference plane 11 of the body 1.
  • the second reinforcing structure on the second pressure relief area 22 is divided into multiple reinforcing regions by using the second reinforcing groove 26, thereby further improving the structural strength of the second pressure relief area 22;
  • the symmetrical arrangement of the first reinforcing groove 25 and the second reinforcing groove 26 makes the two bracket-shaped reinforcing rib structures face away from each other and form an X-shaped structure at the center of the first notch 121, thereby further increasing the strength at the large-span first notch 121; on the other hand, it makes the first pressure relief area 21 and the second pressure relief area 22 of the pressure relief area 2 have a symmetrical structure, which facilitates the processing and manufacturing of the pressure relief area 2.
  • a third reinforcing groove 27 is also provided on the first pressure relief zone 21.
  • the third reinforcing groove 27 is located at the bottom of the first reinforcing groove 25 and extends along the extending direction of the first reinforcing groove 25. In this way, the third reinforcing groove 27 is used to enhance the structural strength of the first reinforcing groove 25, thereby further improving the structural strength of the first pressure relief zone 21.
  • the second pressure relief zone 22 is also provided with a fourth reinforcing groove 28, and the third reinforcing groove 27 and the fourth reinforcing groove 28 are symmetrically arranged on the reference plane 11 of the body 1.
  • the fourth reinforcing groove 28 is used to enhance the structural strength at the second reinforcing groove 26, thereby further enhancing the structural strength of the second pressure relief zone 22; moreover, the symmetrical arrangement of the third reinforcing groove 27 and the fourth reinforcing groove 28 makes the first pressure relief zone 21 and the second pressure relief zone 22 of the pressure relief zone 2 have a symmetrical structure, which facilitates the processing and manufacturing of the pressure relief zone 2.
  • the remaining material thickness t of the body 1 at the explosion-proof notch 12 is between 0.05 mm and 0.15 mm, and/or, the ratio of the length a of the first notch 121 to the length b of the second notch 122 is between 12 and 13, and/or, the ratio of the length a of the first notch 121 to the length d of the fourth notch 124 is between 29 and 30, and/or, the included angle ⁇ formed by the second notch 122 and the third notch 123 is between 80° and 160°, and/or, the included angle ⁇ formed by the second notch 122 and the fourth notch 124 is between 60° and 140°, and/or, the included angle ⁇ formed by the fourth notch 124 and the first extended notch 14 is between 100° and 180°.
  • the explosion-proof notch 12 is composed of a first notch 121, a second notch 122, a third notch 123, a fourth notch 124, and a fifth notch 125.
  • the remaining material thickness t at the explosion-proof notch 12 of the main body 1 is set too small, the structural strength at the connection between the pressure relief area 2 and the main body 1 will be low, making the pressure relief area 2 prone to tearing due to factors such as bumps or vibrations during handling or vehicle travel, thus causing the pressure relief area 2 to fail. Conversely, if the remaining material thickness t at the connection between the pressure relief area 2 and the main body 1 is high, the explosion-proof pressure of the pressure relief area 2 will be high, making the explosion-proof notch 12 less prone to tearing.
  • t is set between 0.05mm and 0.15mm to ensure that the connection between the pressure relief area 2 and the main body 1 has a certain strength while controlling the explosion-proof pressure of the pressure relief area 2 within a suitable range, so as to facilitate the explosion and venting of the pressure relief area 2.
  • the lengths of the second notch 122 and the fourth notch 124 will be smaller than the lengths of the first notch 121, resulting in a smaller tearing range in the pressure relief area 2. This will easily lead to a smaller exhaust hole 100 formed after the pressure relief area 2 cracks, which is not conducive to the rapid discharge of high-temperature gas inside the battery.
  • the ratio of the length a of the first notch 121 to the length b of the second notch 122 is set between 12 and 13 and/or the ratio of the length a of the first notch 121 to the length d of the fourth notch 124 is set between 29 and 30, so that the pressure relief area 2 can be arranged on the body 1.
  • the vent hole 100 formed after the pressure relief area 2 is cracked has a sufficiently large opening area, so that the high temperature gas inside the battery can be quickly discharged, thereby improving the explosion-proof effect.
  • the included angle ⁇ formed by the second scribe line 122 and the third scribe line 123, the included angle ⁇ formed by the second scribe line 122 and the fourth scribe line 124, or the included angle ⁇ formed by the fourth scribe line 124 and the first extended scribe line 14 is set too small, the left and right pressure relief areas of the pressure relief area 2 will be small, resulting in a small exhaust hole 100 formed after the pressure relief area 2 cracks. Conversely, if the included angle ⁇ is too large, the exhaust hole 100 formed after the pressure relief area 2 cracks will be large, occupying a large area of the body 1, which is not conducive to the layout.
  • the included angle ⁇ is set between 80° and 160°, and/or the included angle ⁇ is set between 60° and 140°, and/or the included angle ⁇ is set between 100° and 180°, so that the pressure relief area 2 can be laid on the body 1. At the same time, it ensures that the exhaust hole 100 formed after the pressure relief area 2 cracks has a sufficiently large opening area, so that the high-temperature gas inside the battery can be quickly discharged, thereby improving the explosion-proof effect.
  • an explosion-proof structure including a body 1, on which explosion-proof markings 12 and guide markings 13 are provided;
  • the explosion-proof marking 12 includes a first marking 121 and two second markings 122.
  • the two ends of the first marking 121 are respectively provided with the second markings 122.
  • the second markings 122 are set at an angle to the first marking 121, and the two second markings 122 are located on the same side of the first marking 121.
  • the area enclosed by the line connecting the ends of the two second notches 122 away from the first notch 121, the first notch 121, and the two second notches 122 is the pressure relief area 2;
  • the guide mark 13 coincides with the connecting line, or the guide mark 13 is located on the side of the connecting line away from the pressure relief area 2.
  • explosion-proof structures are commonly used in lithium batteries, and the battery casing typically includes a housing with an opening and a cover plate covering the opening of the housing.
  • the opening of the housing can be located at the top, side, or bottom of the housing. That is, the cover plate of the battery can be the top cover plate, side cover plate, or bottom cover plate of the battery.
  • the body 1 of the explosion-proof structure can be the cover plate of the battery or a side wall of the battery casing, as shown in Figures 14 and 15.
  • the area enclosed by the explosion-proof notch 12 and the guide notch 13 is the pressure relief area 2.
  • the part of the body 1 at the pressure relief area 2 can be defined as an explosion-proof diaphragm flap, that is, the explosion-proof diaphragm flap is integrally formed with the body 1.
  • the pressure relief area 2 is used to crack along the explosion-proof notch 12 when the internal pressure of the battery is greater than the pressure that the explosion-proof notch 12 can withstand, so as to form a vent hole connecting the internal and external spaces of the battery.
  • the guide notch 13 and the explosion-proof notch 12 are respectively set on the same side or opposite side of the body 1.
  • the explosion-proof notch 12 and the guide notch 13 can form a fully enclosed area.
  • the fully enclosed pressure relief area 2 is basically trapezoidal in shape.
  • the guide notch 13 is on the side of the connecting line away from the pressure relief area 2, the explosion-proof notch 12 and the guide notch 13 can form a semi-enclosed area.
  • the guide notch 13 and the explosion-proof notch 12 are not directly connected.
  • the guide notch 13 can be used as a bending line, which facilitates the folding of the pressure relief area 2 relative to the body 1, thereby increasing the opening angle of the explosion-proof structure.
  • the guide notch 13 only serves to guide the folding of the pressure relief area 2, ensuring that even after cracking at the explosion-proof notch 12, the pressure relief area 2 remains connected to the body 1 and does not fly off, thus preventing the explosion-proof membrane flap at the pressure relief area 2 from splashing and damaging adjacent batteries or personnel.
  • the explosion-proof notch 12 is typically a groove structure, which can be formed by stamping on the body 1 or by removing part of the structure of the body 1. In practical applications, stamping is preferred for forming the explosion-proof notch 12.
  • the first notch 121 extends along a first direction, which can refer to the length direction of the battery, for example, parallel to the X-axis direction in the coordinate system of Figure 14.
  • an explosion-proof structure can be provided on, for example, the battery casing or battery cover.
  • the explosion-proof markings 12 and guide markings 13 of the explosion-proof structure can be located on the body 1.
  • the explosion-proof markings 12 mainly include a first marking 121 and two second markings 122.
  • the guide markings 13 and the explosion-proof markings 12 can be located on the same surface or opposite surface of the body 1.
  • the second markings 122 are respectively provided at both ends of the first marking 121. Therefore, the area enclosed by the line connecting the ends of the two second markings 122 away from the first marking 121, the first marking 121, and the two second markings 122 is the pressure relief area 2 of the explosion-proof structure during explosion relief operations.
  • Forming the pressure relief area 2, which serves as the explosion-proof structure for venting and relieving pressure, on the battery casing or cover can not only reduce the parts processing and assembly steps of the explosion-proof structure, improve production efficiency and product qualification rate, but also eliminate the need for additional thinning of the central area of the explosion-proof structure to facilitate cracking of the explosion-proof structure, thereby improving the utilization rate of the body material.
  • explosion-proof structures can adopt the following scheme:
  • the explosion-proof structure mainly includes straight segments and two V-shaped segments on the body 1, wherein each end of the straight segment has a corresponding V-shaped segment.
  • the body 1 first cracks from the straight segment, then extends to the V-shaped segments at both ends.
  • the thermally hazardous gases and electrolyte inside the battery are ejected from the opening to achieve the venting and depressurization of the battery.
  • the structural strength distribution on both sides of the straight segment on the body 1 is uniform, the opening angle of the explosion-proof structure is small, resulting in a weaker effect of venting and depressurizing the battery.
  • the guide groove 13 can coincide with the line connecting the ends of the two second grooves 122 away from the first groove 121, or be located on the side of the line away from the pressure relief area 2, the strength of the part of the body 1 in the pressure relief area 2 is weaker than the strength of the part of the body 1 away from the pressure relief area 2 by the guide groove 13. This allows the battery to tear first from the first groove 121 and the second groove 122 when it is venting and depressurizing, and the part in the pressure relief area 2 (i.e. the explosion-proof diaphragm flap) is flipped open with the guide groove 13 as the folding axis to form an opening.
  • the part in the pressure relief area 2 i.e. the explosion-proof diaphragm flap
  • the depressurization area 2 can first crack at the first notch 121. After the first notch 121 is completely cracked, if the depressurization area 2 is still under pressure, it can continue to crack along the second notch 122, allowing it to tear from the center outwards. Alternatively, the depressurization area 2 can first crack at the second notches 122 at both ends of the first notch 121, and then continue to crack along the first notch 121.
  • This design allows the depressurization area 2 to first detonate the second notches 122 at both ends of the first notch 121, thus causing the first notch 121 to burst open.
  • the method of tearing the depressurization area 2 can be selected by controlling the remaining thickness of the notches.
  • the battery can breathe within the aforementioned pressure relief area 2 during normal operation, so that the area corresponding to the breathing effect in this embodiment is smaller than the area between the straight line segment and the edge of the body 1 in the related art, thereby also contributing to the battery's breathing effect.
  • the groove depth of the guide groove 13 is less than the groove depth of the explosion-proof groove 12.
  • the groove depth of the guide groove 13 refers to the depth of the guide groove 13 in the Z-axis direction of the coordinate system in Figure 16
  • the groove depth of the explosion-proof groove 12 refers to the depth of the explosion-proof groove 12 in the Z-axis direction of the coordinate system in Figure 16.
  • the groove depth of the guide groove 13 is less than the groove depths of the first groove 121, the second groove 122, and the third groove 123 in the explosion-proof groove 12, it can be ensured that the battery tears mainly from the explosion-proof groove 12 when venting and depressurizing, thereby reducing the possibility of tearing from the guide groove 13.
  • the residual thickness j of the guide groove 13 is greater than or equal to 0.2 mm, it can be ensured that the depressurization area 2 can be folded 90 degrees when venting and depressurizing, and the fragments after the explosion remain on the body 1 because they are connected to the guide groove 13.
  • the dimension of the line connecting the ends of the two second notches 122 on the same side away from the first notch 121 matches the length of the guide notch 13.
  • the length of the guide mark 13 can be represented by f.
  • the dimension of the line connecting the ends of the two second marks 122 on the same side away from the first mark 121 matches the length f of the guide mark 13. This means that the dimension of the line can be greater than, equal to or less than the length f of the guide mark 13.
  • the body 1 has opposing outer and inner surfaces
  • Both the guide mark 13 and the explosion-proof mark 12 are located on the outer surface; or, the guide mark 13 is located on the outer surface and the explosion-proof mark 12 is located on the inner surface; or, the guide mark 13 is located on the inner surface and the explosion-proof mark 12 is located on the outer surface; or, both the guide mark 13 and the explosion-proof mark 12 are located on the inner surface.
  • the first notch 121, two second notches 122, and two third notches 123 of the guide notch 13 and the explosion-proof notch 12 may all be located on the outer surface of the body 1. This improves the ease of machining the guide notch 13 and the explosion-proof notch 12 on the body 1, as both are located on the outer surface of the body 1. As shown in FIGS. 18 and 19, the two guide notches 13 may also be located on the outer surface of the body 1, while the first notch 121, two second notches 122, and two third notches 123 of the explosion-proof notch 12 may be located on the inner surface of the body 1. As shown in FIG.
  • the guide notch 13 and the first notch 121, two second notches 122, and two third notches 123 of the explosion-proof notch 12 may all be located on the inner surface of the body 1.
  • the first sipe 121, two second sipes 122, and two third sipes 123 of the explosion-proof sipes 12 can also be located on the outer surface of the body 1, while the two guide sipes 13 are located on the inner surface of the body 1.
  • the design can be selected according to needs in practical applications.
  • the guide mark 13 is a groove structure formed on the body 1.
  • the groove structure has an opening, the width of the guide mark 13 at the opening is between 0.5 mm and 2.0 mm, the included angle i is between 15 degrees and 30 degrees, and the residual thickness j of the body 1 at the guide mark 13 is between 0.15 mm and 0.3 mm.
  • the guide marks 13 and explosion-proof marks 12, which are groove structures, can be formed on the body 1 by laser etching or stamping. Therefore, the guide marks 13 are groove structures formed on the body 1, and have openings at the ends of the groove structures.
  • the cross-sectional shape of the guide marks 13 in the plane where YZ is located in the coordinate system of Figure 24 can be at least one of the following: V-shaped, U-shaped, W-shaped, etc.
  • the width of the guide groove 13 at the opening is set between 0.5 mm and 2.0 mm
  • the included angle i is set between 15 degrees and 30 degrees
  • the residual thickness j of the body 1 at the guide groove 13 is set between 0.15 mm and 0.3 mm.
  • the included angle g between the two opposite groove walls of the first groove 121 is set to be greater than or equal to 60 degrees to facilitate the processing of the explosion-proof groove 12 by working heads such as laser heads and drill bits.
  • the body 1 includes a flat portion 111 and a recessed portion 112.
  • the body 1 is recessed inward toward the body 1 at the explosion-proof groove 12 to form the recessed portion 112.
  • the explosion-proof groove 12 and the guide groove 13 are provided on the recessed portion 112.
  • the explosion-proof markings 12 and guide markings 13 are provided on the recessed portion 112 which is lower than the flat portion 111, not only is the mechanical strength at the flat portion 111 ensured, but also other external components of the battery can be prevented from touching or scratching the explosion-proof markings 12 and guide markings 13 on the body 1.
  • the body 1 includes a flat portion 111 and a boss portion 113.
  • the body 1 protrudes outward from the explosion-proof groove 12 to form the boss portion 113.
  • the explosion-proof groove 12 and the guide groove 13 are provided on the boss portion 113.
  • the explosion-proof groove 12 is provided on the main body 1, or the explosion-proof groove 12 and the guide groove 13 protrude in the direction of the outer side of the main body 1, which refers to the outer side of the battery.
  • the boss portion 113 refers to the part of the body 1 with an explosion-proof structure that protrudes from the flat portion 111, wherein the boss portion 113 may be located basically in the middle of the body 1.
  • the explosion-proof groove 12 and the guide groove 13 are provided on the boss portion 113 protruding from the flat portion 111, not only is the mechanical strength at the flat portion 111 ensured, but also the thermal hazard gas or electrolyte can be quickly diffused after being discharged from the vent hole of the explosion-proof structure, so as to avoid accumulation at the explosion-proof groove 12, thereby improving the venting and pressure relief effect of the battery.
  • the explosion-proof notch 12 further includes two third notches 123.
  • the two ends of the first notch 121 are respectively provided with the third notches 123.
  • the third notches 123 and the second notches 122 are respectively located on both sides of the first notch 121.
  • the third notches 123 and the second notches 122 are arranged at an angle and their ends meet at the end of the first notch 121.
  • the body 1 is provided with two guide notches 13.
  • a guide notch 13 is symmetrically provided on both sides of the first notch 121.
  • the explosion-proof marking 12 includes a first marking 121, two second markings 122 and two third markings 123.
  • the second markings 122 and the third markings 123 are provided at each end of the first marking 121, and the second markings 122 and the third markings 123 are located on opposite sides of the first marking 121.
  • the ends of the two second markings 122 away from the first marking 121 i.e., the free ends of the second markings 122
  • the ends of the two third markings 123 away from the first marking 121 i.e., the free ends of the third markings 123 together constitute the free ends of the explosion-proof marking 12.
  • Two second sipes 122 are respectively disposed at the front and rear ends of the first sipe 121 (i.e., the first sipe 121 is located at both ends in the X-axis direction in Figure 17), and two third sipes 123 are also respectively disposed at the front and rear ends of the first sipe 121.
  • the two second sipes 122 are located on the left side of the first sipe 121 (i.e., the first sipe 121 is located on the side in the positive Y-axis direction in Figure 14)
  • the two third sipes 123 are located on the right side of the first sipe 121 (i.e., the first sipe 121 is located on the side in the opposite Y-axis direction in Figure 14).
  • the ends of the second sipes 122 and the third sipes 123 located at the front end of the first sipe 121 meet at the front end of the first sipe 121
  • the ends of the second sipes 122 and the third sipes 123 located at the rear end of the first sipe 121 meet at the rear end of the first sipe 121.
  • the main body 1 has two guide marks 13, which are located on both sides of the first mark 121 (e.g., on both sides along the Y-axis direction in the coordinate system of Figure 17).
  • One of the guide marks 13 coincides with this line or is located on the side of the line away from the pressure relief region 2 (e.g., the side in the positive Y-axis direction in Figure 17).
  • the line connecting the ends of the two third marks 123 away from the first mark 121, together with the first mark 121 and the two third marks 123 forms another pressure relief region 2.
  • the other guide mark 13 coincides with this line or is located on the side of the line away from this other pressure relief region 2 (e.g., the side in the opposite Y-axis direction in Figure 17).
  • the first notch 121 can be a straight groove, a wavy groove, or a serrated groove extending along a set direction. In practical applications, for ease of processing, a straight groove is usually preferred for the first notch 121.
  • the set direction can be the length direction of the body 1 (i.e., the X-axis direction in Figure 14) or the width direction (i.e., the Y-axis direction in Figure 14).
  • the shape of the second notch 122 can be oblique, U-shaped, C-shaped, etc.
  • the shapes of the second notch 122 and the third notch 123 can be the same or different.
  • the second notch 122 and the third notch 123 are usually symmetrically arranged on the left and right sides of the first notch 121.
  • the second notch 122 and the third notch 123 are oblique and symmetrically arranged.
  • the ends of the second groove 122 and the third groove 123 of the explosion-proof groove 12 meet at the end of the first groove 121, and the pressure relief area 2 enclosed by the first groove 121 and the second groove 122 located at both ends of the first groove 121 is defined as the first pressure relief area, and the pressure relief area 2 enclosed by the first groove 121 and the third groove 123 located at both ends of the first groove 121 is defined as the second pressure relief area.
  • the pressure relief area 2 consist of two pressure relief areas, so as to protect the surrounding cells by using the two pressure relief areas and prevent things such as high-temperature airflow and electrolyte from splashing onto the surrounding cells, thereby reducing the degree of contamination of the surrounding cells after the pressure relief area 2 is opened.
  • the structural strength of the body 1 in the adjacent area of the second notch 122 and the structural strength of the body 1 in the adjacent area of the third notch 123 are both greater than the structural strength of the body 1 in the first notch 121.
  • the groove depth of the second groove 122 is greater than or equal to the groove depth of the first groove 121, and/or the groove depth of the third groove 123 is greater than or equal to the groove depth of the first groove 121.
  • the groove depth of at least one of the second notch 122 and the third notch 123 is greater than or equal to the groove depth of the first notch 121.
  • the groove depth of the second notch 122 or the third notch 123 is greater than the groove depth of the first notch 121; or, the groove depth of the second notch 122 or the third notch 123 is equal to the groove depth of the first notch 121; or, the groove depths of both the second notch 122 and the third notch 123 are greater than the groove depth of the first notch 121; or, the groove depths of both the second notch 122 and the third notch 123 are equal to the groove depth of the first notch 121.
  • the groove depth refers to the depth of the explosion-proof notch 12 along the Z-axis in the coordinate system of Figure 16.
  • the groove depths of the second and third notches 122 and 123 are greater than the groove depth of the first notch 121, in other words, the remaining thickness of the second and third notches 122 and 123 is less than the remaining thickness of the first notch 121, then the structural strength of the body 1 at the second and third notches 122 and 123 will be weaker than the structural strength at the first notch 121.
  • the structural strength of the body 1 at the second and third notches 122 and 123 is basically the same as the structural strength at the first notch 121.
  • the structural strength of the body 1 at the second groove 122 and the third groove 123 is weaker than the structural strength at the first groove 121.
  • the pressure relief region 2 can first tear from the second groove 122 and the third groove 123 located at both ends of the first groove 121. If the pressure relief region 2 continues to be under pressure, it can then continue to crack along the first groove 121 to form a vent. In other words, the pressure relief region 2...
  • the structural strength of the body 1 at the second groove 122 and the third groove 123 is equal to the structural strength at the first groove 121.
  • both methods can enable the pressure relief area 2 to open in a preset direction.
  • the residual thickness (remaining material thickness) of the body 1 at the explosion-proof notch 12 is between 0.05 mm and 0.15 mm.
  • the structural strength at the connection between the pressure relief area 2 and the body 1 will be small, making the pressure relief area 2 prone to tearing due to factors such as bumps or vibrations during handling or vehicle travel, thus causing the pressure relief area 2 to fail; conversely, the structural strength at the connection between the pressure relief area 2 and the body 1 will be large, resulting in a larger explosion-proof pressure in the pressure relief area 2, making the explosion-proof notch 12 less prone to tearing.
  • the residual thickness of the body 1 at the explosion-proof notch 12 is set to be between 0.05mm and 0.15mm, so as to ensure that the connection between the pressure relief area 2 and the body 1 has a certain strength, while controlling the explosion-proof pressure of the pressure relief area 2 within a suitable range, so as to facilitate the explosion and exhaust of the pressure relief area 2.
  • the included angle ⁇ formed by the second notch 122 and the third notch 123 is between 80° and 160°.
  • the explosion-proof notch 12 consists of a first notch 121, two second notches 122, and two third notches 123. Since the included angle ⁇ formed by the second notches 122 and the third notches 123 is between 80° and 160°, if the included angle ⁇ is too small, the area of the pressure relief region 2 will be small, resulting in a small vent after the pressure relief region 2 cracks open. Conversely, if the included angle ⁇ is too large, the vent after the pressure relief region 2 cracks open will be large, occupying a large area of the body 1, which is not conducive to its installation.
  • the included angle ⁇ is set between 80° and 160° to reduce the length of the explosion-proof notch 12 per unit area and to facilitate the installation of the pressure relief region 2 on the body 1. Simultaneously, it ensures that the vent formed after the pressure relief region 2 cracks open has a sufficiently large opening area, allowing the high-temperature gas inside the battery to escape quickly, thereby improving the explosion-proof effect.
  • the length e between the second mark 122 and the third mark 123 at the end of the first mark 121 is greater than or equal to 9mm, which is equivalent to increasing the size of the explosion-proof structure in the X-axis direction of the coordinate system in Figure 27, thereby further increasing the opening area of the vent hole in the pressure relief area 2 after cracking.
  • the distance n between the two guide marks 13 can directly determine the opening area of the vent hole of the explosion-proof structure and the location of the explosion point.
  • the lengths of the second scratch 122 and the third scratch 123 are set to be less than the length of the first scratch 121, so that the structural strength of the body 1 at the second scratch 122 and the structural strength of the body 1 at the third scratch 123 are both greater than the structural strength of the body 1 at the first scratch 121.
  • Another embodiment of the present invention provides a battery including the explosion-proof structure described above.
  • Another embodiment of the present invention provides an electrical device, including the explosion-proof structure described above, or including the battery described above.
  • the electrical equipment can be from the transportation sector, such as electric vehicles, hybrid electric vehicles, electric engineering vehicles, electric ships, etc., or it can be mobile communication equipment, etc., without specific limitations.
  • the beneficial effects of the electrical equipment in this embodiment compared to the prior art are the same as those of the explosion-proof structure described above, and will not be repeated here.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

La présente invention prévoit une structure antidéflagrante, une batterie et un dispositif électrique, se rapportant au domaine technique des batteries. La structure antidéflagrante comprend un corps pourvu d'encoches antidéflagrantes, et des zones entourées par les encoches antidéflagrantes forment une région de protection contre les surpressions. Une deuxième encoche et une troisième encoche des encoches antidéflagrantes sont respectivement situées sur deux côtés d'une première encoche, des parties d'extrémité de la deuxième encoche et de la troisième encoche se croisent au niveau de parties d'extrémité de la première encoche, et les longueurs de la deuxième encoche et de la troisième encoche sont respectivement inférieures à la longueur de la première encoche. La zone entourée par la première encoche et la deuxième encoche située aux deux extrémités de la première encoche forme une première zone protection contre les surpressions de la région de protection contre les surpressions, et la zone entourée par la première encoche et la troisième encoche située aux deux extrémités de la première encoche forme une deuxième zone de protection contre les surpressions de la région de protection contre les surpressions. Ainsi, la région de protection contre les surpressions est formée sur le corps, de façon à réduire les processus d'usinage et d'assemblage, et à améliorer l'efficacité de production et le taux de réussite du produit. De plus, la région de protection contre les surpressions est composée des deux zones de protection contre les surpressions et de fissures au milieu, de sorte que la région de protection contre les surpressions s'ouvre dans un sens fixe tout en protégeant les éléments environnants.
PCT/CN2025/097052 2024-05-31 2025-05-26 Structure antidéflagrante, batterie et dispositif électrique Pending WO2025247123A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN202410696858.XA CN118539082A (zh) 2024-05-31 2024-05-31 一种防爆结构、电池及用电设备
CN202410696858.X 2024-05-31
CN202422518533.0U CN223598830U (zh) 2024-10-17 2024-10-17 一种防爆结构、电池及用电设备
CN202422518533.0 2024-10-17

Publications (1)

Publication Number Publication Date
WO2025247123A1 true WO2025247123A1 (fr) 2025-12-04

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WO (1) WO2025247123A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207134411U (zh) * 2017-08-16 2018-03-23 深圳市瑞德丰精密制造有限公司 爆破片
CN108428836A (zh) * 2018-01-09 2018-08-21 宁德时代新能源科技股份有限公司 二次电池顶盖用防爆阀、顶盖组件、二次电池及汽车
CN114628845A (zh) * 2022-05-12 2022-06-14 比亚迪股份有限公司 电池、电池模组、电池包和车辆
CN218300006U (zh) * 2022-04-24 2023-01-13 宁德时代新能源科技股份有限公司 用于电池单体的外壳、电池单体、电池及用电装置
CN218731600U (zh) * 2022-10-31 2023-03-24 楚能新能源股份有限公司 一种防爆阀、电池盖板及电池
CN218769952U (zh) * 2021-08-31 2023-03-28 宁德时代新能源科技股份有限公司 泄压装置、电池单体、电池及用电设备
CN116666887A (zh) * 2023-05-31 2023-08-29 宁德时代新能源科技股份有限公司 电池单体、电池及用电设备
CN221486733U (zh) * 2023-11-16 2024-08-06 宁德时代新能源科技股份有限公司 电池单体、电池及用电装置
CN118539082A (zh) * 2024-05-31 2024-08-23 宁波信泰机械有限公司 一种防爆结构、电池及用电设备
CN118630418A (zh) * 2024-06-17 2024-09-10 上海砚泽智能科技有限公司 带辅助刻痕的新能源电池外壳及其加工方法
CN221928295U (zh) * 2023-11-23 2024-10-29 宁德时代新能源科技股份有限公司 外壳、电池单体、电池及用电装置

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207134411U (zh) * 2017-08-16 2018-03-23 深圳市瑞德丰精密制造有限公司 爆破片
CN108428836A (zh) * 2018-01-09 2018-08-21 宁德时代新能源科技股份有限公司 二次电池顶盖用防爆阀、顶盖组件、二次电池及汽车
CN218769952U (zh) * 2021-08-31 2023-03-28 宁德时代新能源科技股份有限公司 泄压装置、电池单体、电池及用电设备
CN218300006U (zh) * 2022-04-24 2023-01-13 宁德时代新能源科技股份有限公司 用于电池单体的外壳、电池单体、电池及用电装置
CN114628845A (zh) * 2022-05-12 2022-06-14 比亚迪股份有限公司 电池、电池模组、电池包和车辆
CN218731600U (zh) * 2022-10-31 2023-03-24 楚能新能源股份有限公司 一种防爆阀、电池盖板及电池
CN116666887A (zh) * 2023-05-31 2023-08-29 宁德时代新能源科技股份有限公司 电池单体、电池及用电设备
CN221486733U (zh) * 2023-11-16 2024-08-06 宁德时代新能源科技股份有限公司 电池单体、电池及用电装置
CN221928295U (zh) * 2023-11-23 2024-10-29 宁德时代新能源科技股份有限公司 外壳、电池单体、电池及用电装置
CN118539082A (zh) * 2024-05-31 2024-08-23 宁波信泰机械有限公司 一种防爆结构、电池及用电设备
CN118630418A (zh) * 2024-06-17 2024-09-10 上海砚泽智能科技有限公司 带辅助刻痕的新能源电池外壳及其加工方法

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