WO2024255914A1 - Battery pack and energy storage system - Google Patents

Abstract

A battery pack (100) and an energy storage system. The energy storage system comprises a battery pack (100). The battery pack (100) comprises a case (10) and a battery module (20), wherein a first wiring terminal (111) and a second wiring terminal (112) are provided on a first panel (11) of the case (10), and the first wiring terminal (111) and the second wiring terminal (112) are respectively located on two sides of the first panel (11) in a first direction; and the battery module (20) is arranged in the case (10), and comprises a plurality of battery cells (21) arranged in series, the battery cell (21) located at a head end of a series circuit being connected to a first output bar (22), the battery cell (21) located at a tail end of the series circuit being connected to a second output bar (23), the first output bar (22) and the second output bar (23) respectively being located on two sides of the battery module (20) in the first direction, the first output bar (22) being electrically connected to the first wiring terminal (111), and the second output bar (23) being electrically connected to the second wiring terminal (112). By separately arranging the first wiring terminal (111) and the second wiring terminal (112) on two sides, when a plurality of battery packs (100) are connected in parallel, clear and regular wiring can be ensured, the battery packs (100) are convenient to mount in parallel, and positive and negative electrodes are not prone to being connected incorrectly, thus lowering the short-circuit risk.

Description

Battery pack and energy storage system

This application claims the priority of the Chinese patent application filed with the China Patent Office on April 26, 2024, with application number 202420894107.4. The entire contents of the above application are incorporated by reference into this application.

Technical Field

The present application relates to the field of energy storage technology, and in particular to a battery pack and an energy storage system.

Background Art

Low-voltage energy storage systems are widely used and can be used in many scenarios such as homes, industrial equipment, unstable power, and power storage and power generation in areas without electricity to optimize energy saving. Energy storage systems usually include multiple battery packs, which are arranged in a vertical stacking manner.

In order to realize the parallel function of multiple battery packs, the positive terminals of adjacent battery packs are connected by wires, and the negative terminals of adjacent battery packs are connected by wires, so as to realize the parallel connection of multiple battery packs. However, in the existing battery packs, the positive and negative terminals are led out from the same side, and the positive and negative terminals are arranged adjacent to each other, which leads to dense and messy wiring when parallel wiring, inconvenient maintenance in the later stage, and the positive and negative electrodes are easily short-circuited by mistake.

Technical issues

The present application provides a battery pack that can avoid dense and messy wiring when the battery packs are connected in parallel, thereby reducing the risk of short circuits.

The present application provides an energy storage system, which, by providing the above-mentioned battery pack, can avoid dense and messy wiring when the battery packs are connected in parallel, facilitate later maintenance, and reduce the risk of short circuit.

Solution

In a first aspect, an embodiment of the present application provides a battery pack, comprising:

A box body, wherein a first panel of the box body is provided with a first terminal and a second terminal, the length direction of the first panel is a first direction, and the first terminal and the second terminal are respectively located on both sides of the first panel along the first direction;

A battery module is arranged in the box, and the battery module includes a plurality of battery cells arranged in series. The battery cells located at the head end of the series loop are connected to the first output row, and the battery cells located at the end of the series loop are connected to the second output row. The first output row and the second output row are respectively located on both sides of the battery module along the first direction. The first output row is electrically connected to the first terminal, and the second output row is electrically connected to the second terminal.

In a second aspect, an embodiment of the present application provides an energy storage system, comprising a plurality of the above-mentioned battery packs, wherein the plurality of battery packs are stacked and arranged in parallel along the height direction of the first panel, the first terminal heads of the plurality of battery packs are located on the same side and connected by a first power line, and the second terminal heads of the plurality of battery packs are located on the same side and connected by a second power line.

Beneficial Effects

The present application provides a battery pack, which leads the first output row and the second output row from both sides of the battery module along the first direction, and on this basis, facilitates the first terminal and the second terminal to be led out on both sides of the first panel along the first direction, so that the first output row corresponds to the position of the first terminal, and the second output row corresponds to the position of the second terminal. Since the first terminal and the second terminal are separately arranged on both sides, when multiple battery packs are connected in parallel, the wiring can be clear and regular, which is convenient for parallel installation and later maintenance, and it is not easy to connect the positive and negative poles incorrectly, reducing the risk of short circuit.

The energy storage system provided in the present application, by providing the above-mentioned battery pack, can avoid dense and messy wiring when the battery packs are connected in parallel, facilitate subsequent maintenance, and reduce the risk of short circuit.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application;

FIG2 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

FIG3 is a schematic diagram of the structure of a battery pack without a housing provided in an embodiment of the present application;

FIG4 is a schematic diagram of the structure of multiple battery cells after assembly according to an embodiment of the present application;

FIG5 is a schematic diagram of the structure of a single battery module provided in an embodiment of the present application;

FIG. 6 is a schematic diagram of the structure of two battery modules provided in an embodiment of the present application.

In the figure:

100, battery pack; 200, first power line; 300, second power line; 400, communication line;

10. Box body; 11. First panel; 111. First connection head; 112. Second connection head; 113. First communication port; 114. Second communication port; 115. Handle; 12. Housing;

20. Battery module; 21. Cell; 211. First electrode; 212. Second electrode; 213. First cell; 214. End cell; 22. First output row; 23. Second output row; 24. Middle series row; 25. End plate; 26. Fixing belt; 27. Temperature plate;

30. BMS module.

Embodiments of the present invention

This embodiment provides a battery pack 100 and an energy storage system, as shown in FIG1 , the energy storage system includes a plurality of battery packs 100, and the plurality of battery packs 100 are stacked and arranged in parallel. In an optional embodiment, as shown in FIG1 , the battery packs 100 are arranged to be three, and in other embodiments, the battery packs 100 may also be arranged to be other numbers according to actual needs, which is not limited here.

As shown in FIGS. 2 and 3 , the battery pack 100 includes a box body 10 and a battery module 20 disposed in the box body 10, wherein the box body 10 includes a shell 12 and a first panel 11, one end of the shell 12 is open, and the first panel 11 is located at the front side of the shell 12 and is configured to block the opening of the shell 12 to form a closed cavity. For ease of understanding, the length direction of the box body 10 is the front-to-back direction, which is the second direction mentioned later, the width direction of the box body 10 is the left-to-right direction, which is the first direction mentioned later, and the height direction of the box body 10 is the up-down direction, which is the height direction and the third direction of the first panel 11 mentioned later.

A first terminal 111 and a second terminal 112 are provided on the first panel 11 of the box body 10. The first terminal 111 and the second terminal 112 are respectively located on both sides of the first panel 11 along the first direction (left-right direction). One of the first terminal 111 and the second terminal 112 is a positive terminal and the other is a negative terminal. The battery module 20 includes a plurality of battery cells 21 arranged in series, wherein the battery cells 21 are square shell battery cells, and the plurality of battery cells 21 are connected in series in sequence to form a series circuit, wherein the battery cell 21 located at the head end of the series circuit is connected to a first output row 22, and the battery cell 21 located at the end of the series circuit is connected to a second output row 23, and the first output row 22 and the second output row 23 are respectively located on both sides of the battery module 20 along a first direction (left-right direction), and one of the first output row 22 and the second output row 23 is a positive output row, and the other is a negative output row, and the first output row 22 corresponds to the polarity of the first terminal 111, and the second output row 23 corresponds to the polarity of the second terminal 112, the first output row 22 is electrically connected to the first terminal 111, and the second output row 23 is electrically connected to the second terminal 112, thereby realizing voltage output.

By leading the first output row 22 and the second output row 23 from the left and right sides of the battery module 20, respectively, on this basis, it is convenient to lead the first terminal 111 and the second terminal 112 from the left and right sides of the first panel 11, respectively, so that the first output row 22 corresponds to the position of the first terminal 111, and the second output row 23 corresponds to the position of the second terminal 112. Since the first terminal 111 and the second terminal 112 are separately arranged on the left and right sides, when multiple battery packs 100 are stacked and connected in parallel along the height direction of the first panel 11, referring to FIG. 1, the first terminals 111 of the multiple battery packs 100 are located on the same side (left side) and connected through the first power line 200, and the second terminals 112 of the multiple battery packs 100 are located on the same side (right side) and connected through the second power line 300, so that the routing of the power line can be clear and regular, which is convenient for parallel installation and later maintenance, and it is not easy to connect the positive and negative poles incorrectly, reducing the risk of short circuit.

In an optional embodiment, as shown in FIG3 , the battery pack 100 further includes a battery management system (BMS) module 30. The BMS module 30 is disposed in the housing 12 and close to the opening of the housing 12. The front side of the BMS module 30 is provided with a first panel 11, and the first panel 11 is sealed at the open end of the housing 12 to form a closed box 10. In other words, the first panel 11 constituting the box 10 is the first panel 11 of the BMS module 30. The box 10 and the BMS module 30 share a first panel 11, which simplifies the structure of the battery pack 100 and saves manufacturing costs. On this basis, the first output row 22 can be electrically connected to the first terminal 111 through the built-in connection row or wiring harness of the BMS module 30, and the second output row 23 can be electrically connected to the second terminal 112 through the built-in connection row or wiring harness of the BMS module 30.

In an optional embodiment, as shown in FIG3 , a plurality of battery cells 21 are placed flat and stacked. By placing a plurality of battery cells 21 flat, it is convenient to lead the first output row 22 and the second output row 23 out from the left and right sides of the battery module 20 .

In an optional embodiment, as shown in FIG. 3 , the battery pack 100 includes two groups of battery modules 20 , which are arranged side by side along a first direction (left-right direction) and connected in series to form a 48V system. Among the two battery modules 20 , a first output row 22 is provided on the left side of the left battery module 20 , and a second output row 23 is provided on the right side of the right battery module 20 .

In an optional embodiment, as shown in FIG. 4 and FIG. 5 , a battery module 20 includes eight battery cells 21, and the eight battery cells 21 are stacked in two layers in the vertical direction, and four battery cells 21 are placed flat in each layer. Each battery cell 21 includes a first electrode 211 and a second electrode 212, and the first electrode 211 and the second electrode 212 are located on the same side of the battery cell 21, and one of the first electrode 211 and the second electrode 212 is a positive electrode, and the other is a negative electrode.

In the first direction (left-right direction), the two battery cells 21 arranged side by side face opposite directions, that is, in the left-right direction, one end of the electrodes of the two battery cells 21 face opposite directions, and the first electrodes 211 and the second electrodes 212 of the two battery cells 21 are arranged alternately, that is, the first electrode 211 of the left battery cell 21 and the second electrode 212 of the right battery cell 21 are located on the same side, and the second electrode 212 of the left battery cell 21 and the first electrode 211 of the right battery cell 21 are located on the same side, the first electrode 211 of one of the left battery cells 21 is connected to the first output row 22, and the second electrode 212 of one of the right battery cells 21 is connected to the second output row 23.

In two battery cells 21 adjacent to each other in the second direction (front-rear direction), the second electrode 212 of the front battery cell 21 and the first electrode 211 of the rear battery cell 21 are disposed adjacent to each other.

In the third direction (up and down direction), the large surfaces of two adjacent battery cells 21 are in contact with each other, and the first electrodes 211 and the second electrodes 212 of the two battery cells 21 are alternately arranged, that is, the first electrode 211 of the upper battery cell 21 and the second electrode 212 of the lower battery cell 21 are located on the same side, and the second electrode 212 of the upper battery cell 21 and the first battery cell 21 of the lower battery cell 21 are located on the same side.

Referring to Figure 3, among the multiple battery cells 21, the two battery cells 21 located on the front side of the upper layer are respectively a head battery cell 213 and a tail battery cell 214, the first electrode 211 of the head battery cell 213 is connected to the first output row 22, the second electrode 212 of the tail battery cell 214 is connected to the second output row 23, the first electrodes 211 and the second electrodes 212 of two adjacent battery cells 21 are connected in series through an intermediate series row 24, and each intermediate series row 24 is connected to the corresponding electrode by welding, riveting, etc.

When the battery modules 20 are arranged in two groups, as shown in FIG6 , the second output row 23 of the first battery module 20 is connected to the first output row 22 of the second battery module 20, thereby realizing the series connection of the terminal battery cell 214 of the first battery module 20 and the head battery cell 213 of the second battery module 20, and then realizing the series connection of the two battery modules 20. The first output row 22 of the first battery module 20 and the second output row 23 of the second battery module 20 are located at the left and right ends respectively, and the first output row 22 of the first battery module 20 is communicatively connected to the first terminal 111, and the second output row 23 of the second battery module 20 is communicatively connected to the second terminal 112.

By arranging the multiple battery cells 21 in the battery module 20 in a flat and stacked arrangement, it is convenient to lead out the first output row 22 and the second output row 23 from the left and right ends of the battery module 20 respectively, so as to facilitate the first terminal 111 and the second terminal 112 to be led out on the left and right sides of the first panel 11 respectively. When multiple battery packs 100 are connected in parallel, the routing of the power lines can be ensured to be clear and regular, which is convenient for parallel installation and subsequent maintenance, and it is not easy to connect the positive and negative poles incorrectly, reducing the risk of short circuit.

In other embodiments, different voltage requirements may also be met by changing the number of battery cells 21 connected in series in each battery module 20 or by changing the number of battery modules 20 .

In an optional embodiment, as shown in FIG. 2 and FIG. 3 , a first communication port 113 and a second communication port 114 are further provided on the first panel 11 , and the first communication port 113 and the second communication port 114 are arranged at intervals along the height direction (up and down direction) of the first panel 11 . Referring to FIG. 1 , taking the first communication port 113 as an input port and the second communication port 114 as an output port as an example, the first communication port 113 of one battery pack 100 and the second communication port 114 of the adjacent battery pack 100 are arranged adjacent to each other and are connected to each other through a communication line 400 and the communication connection is realized through the communication line 400 , and the first communication port 113 of the uppermost battery pack 100 and the second communication port 114 of the lowermost battery pack 100 are respectively connected to the external device through the communication line 400 to realize the function of communicating with the external device. Therefore, by arranging the first communication port 113 and the second communication port 114 on the upper and lower sides, the upper and lower ends can be cascaded for communication respectively, which is not easy to be mixed, and the wiring is clear and simple, which is convenient for installation. In an optional embodiment, as shown in FIG4 , a temperature averaging plate 27 is provided between two adjacent battery cells 21 in the third direction, and the temperature averaging plate 27 is in contact with the large surface of the battery cell 21, so that the contact area between the temperature averaging plate 27 and the battery cell 21 is as large as possible, thereby increasing the effective heat dissipation area and thermal conductivity, and enhancing the temperature consistency between the battery cells 21. Optionally, the temperature averaging plate 27 is a copper plate with good thermal conductivity. In practical applications, a whole temperature averaging plate 27 can be placed directly between the upper and lower layers of battery cells 21.

In an optional embodiment, the temperature averaging plate 27 is hollow and filled with phase change material, such as a copper vapor chamber (VC). With this configuration, the temperature averaging plate 27 not only has a temperature averaging function, but also can absorb the expansion force of the battery cell 21, thereby ensuring the performance and service life of the battery cell 21.

In an optional embodiment, as shown in FIG. 5 , the battery module 20 further includes two fixing belts 26 and two end plates 25. In the thickness direction (up and down direction) of the battery cell 21, the two end plates 25 are opposite and spaced apart, and a plurality of battery cells 21 are located between the two end plates 25. The two fixing belts 26 are respectively mounted on the two end plates 25 to bundle and fix the battery cells 21 and the end plates 25 to form an integrated battery module 20, thereby ensuring the overall firmness of the battery module 20. The fixing belt 26 can be a steel belt, which has a high structural strength.

In an optional embodiment, in order to limit the movement of the fixing belt 26, a limiting groove is provided on the end plate 25, and the fixing belt 26 is accommodated in the limiting groove to limit the fixing belt 26, thereby ensuring that the fixing belt 26 is not easily displaced during the bundling process, thereby improving the stability of the bundling.

In an optional embodiment, as shown in Fig. 2, a handle 115 is provided on the first panel 11. By providing the handle 115, the battery pack 100 can be easily taken in and out.

In an optional embodiment, the handle 115 may be hinged on the first panel 11, and the first panel 11 may be provided with a groove configured to accommodate the handle 115. When the handle 115 is not in use, the handle 115 may be rotated into the groove for storage, which does not affect the normal use of the battery pack 100; when the handle 115 is needed, the handle 115 may be rotated out of the groove, and the battery pack 100 may be taken in and out through the handle 115, which is flexible and convenient to use.

Claims (10)

A battery pack, comprising: A box body (10), wherein a first panel (11) is provided with a first terminal (111) and a second terminal (112), the length direction of the first panel (11) being a first direction, and the first terminal (111) and the second terminal (112) are respectively located on two sides of the first panel (11) along the first direction; A battery module (20) is arranged in the box (10), the battery module (20) comprising a plurality of battery cells (21) connected in series, the battery cell (21) located at the head end of the series loop is connected to a first output row (22), the battery cell (21) located at the end of the series loop is connected to a second output row (23), the first output row (22) and the second output row (23) are respectively located on both sides of the battery module (20) along the first direction, the first output row (22) is electrically connected to the first terminal (111), and the second output row (23) is electrically connected to the second terminal (112). The battery pack according to claim 1, wherein a plurality of the battery cells (21) are laid flat and stacked. The battery pack according to claim 2, wherein the thickness direction of the battery cell (21) is a third direction, a temperature averaging plate (27) is provided between two adjacent battery cells (21) in the third direction, and the temperature averaging plate (27) is in contact with the large surfaces of the two adjacent battery cells (21). The battery pack according to claim 3, wherein the temperature averaging plate (27) is hollow, and the interior of the temperature averaging plate (27) is filled with phase change material. The battery pack according to any one of claims 1 to 4, wherein the first panel (11) is provided with a first communication port (113) and a second communication port (114), and the first communication port (113) and the second communication port (114) are arranged at intervals along a height direction of the first panel (11). The battery pack according to any one of claims 1 to 4, wherein the battery module (20) further comprises a fixing belt (26) and two end plates (25), in the thickness direction of the battery cell (21), the two end plates (25) are arranged opposite to each other and spaced apart, a plurality of the battery cells (21) are located between the two end plates (25), and the fixing belt (26) is sleeved on the two end plates (25). The battery pack according to any one of claims 1 to 4, wherein the battery pack comprises at least two groups of the battery modules (20), and the at least two groups of the battery modules (20) are arranged side by side and in series along the first direction, and among the battery modules (20) located at the two ends, one of the battery modules (20) is provided with the first output row (22), and the other of the battery modules (20) is provided with the second output row (23). The battery pack according to any one of claims 1 to 4, wherein the box body (10) further comprises an outer shell (12), and one end of the outer shell (12) is open; The battery pack further comprises a battery management system BMS module (30), the BMS module (30) being arranged in the outer shell (12) and close to an opening of the outer shell (12), the BMS module (30) being provided with the first panel (11), the first panel (11) being sealed at the open end of the outer shell (12) to form the closed box body (10). An energy storage system, comprising a plurality of battery packs according to any one of claims 1 to 8, wherein the plurality of battery packs are stacked and arranged in parallel along the height direction of the first panel (11), the first terminals (111) of the plurality of battery packs are located on the same side and connected via a first power line (200), and the second terminals (112) of the plurality of battery packs are located on the same side and connected via a second power line (300). The energy storage system according to claim 9, wherein the first panel (11) is provided with a first communication port (113) and a second communication port (114), and the first communication port (113) and the second communication port (114) are arranged at intervals along the height direction of the first panel (11); The first communication port (113) of one battery pack and the second communication port (114) of an adjacent battery pack are arranged adjacent to each other and are communicatively connected via a communication line (400).