Battery pack

Abstract

Disclosed in the present application is a battery pack. The battery pack comprises battery modules (1) and a CCS acquisition assembly (2), wherein the CCS acquisition assembly (2) comprises busbars (21), acquisition wire harnesses (22) and a first foam pad (23); the busbars (21) are configured to be connected to the battery modules (1); the acquisition wire harnesses (22) are connected to the busbars (21); the first foam pad (23) is arranged on the battery modules (1); the first foam pad (23) comprises a body portion (231) and a first connection portion (232); the body portion (231) is provided with a first communication port (233) corresponding to an explosion-proof valve of each cell; and the first connection portion (232) rotates to buffer and absorb an electrolyte sprayed by the explosion-proof valve.

Description

battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 8, 2024, with application number 202421927529.3. The entire contents of the above application are incorporated by reference into this application.

[0002] Technical Field

[0003] The present application relates to the field of battery technology, for example, to a battery pack.

[0004] Background Art

[0005] When a battery experiences thermal runaway, it rapidly releases its stored electrical and chemical energy, causing the electrolyte and chemicals inside to decompose rapidly, producing large amounts of gas. This, in turn, leads to a sharp increase in pressure within the battery. To ensure the safety of new energy vehicles, the battery modules in new energy vehicles communicate with the battery management system via the Cells Contact System (CCS) signal acquisition component. To prevent explosions caused by excessive pressure inside the battery, batteries are often equipped with explosion-proof valves designed to release pressure.

[0006] Technical issues

[0007] However, when batteries are assembled into battery modules, the explosion-proof valves are exposed. Therefore, when a battery experiences thermal runaway, the high-temperature electrolyte released after the explosion of the explosion-proof valve will affect adjacent batteries and may leak into the CCS signal acquisition component, affecting the use of the entire CCS signal acquisition component and causing safety hazards when the battery module is in use.

[0008] Technical Solutions

[0009] The present application provides a battery pack with a simple structure. The first foam can absorb the electrolyte, thereby ensuring the safety of the CCS component and the battery pack as a whole.

[0010] A battery pack is provided, comprising a battery module and a CCS collection assembly. The CCS collection assembly comprises a bus, a collection harness, and a first foam. The bus is configured to connect the battery module. The collection harness is connected to the bus. The first foam is arranged on the battery module. The first foam comprises a main body and a first connecting portion. The main body is provided with a first communication port corresponding to an explosion-proof valve of each battery cell in the battery module. The first connecting portion is arranged in the first communication port, and the first connecting portion has a connecting end connected to a cavity wall of the first communication port and a free end spaced from the cavity wall of the first communication port. The free end is configured to rotate along the connecting end to buffer and absorb electrolyte sprayed by the explosion-proof valve.

[0011] Beneficial effects

[0012] The beneficial effects of the present application are as follows: through the provision of the first foam, the electrolyte leaked from the battery explosion-proof valve in the battery module can be blocked and absorbed to a certain extent, thereby reducing the occurrence of electrolyte splashing from individual batteries to other adjacent batteries and affecting normal use, and reducing the corrosion and other effects of electrolyte leakage on the CCS collection component, thereby better protecting electrical components and improving the safety of the CCS collection component and the entire battery module; through the provision of the free end being separated from the cavity wall of the first connecting port and being able to rotate along the connecting end, the free end can rotate around the connecting end under the impact of the electrolyte at the moment of explosion of the explosion-proof valve, and the free end blocks, buffers and absorbs the sprayed electrolyte during the rotation process, thereby reducing the occurrence of electrolyte splashing to other batteries.

[0013] BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;

[0015] FIG2 is a schematic structural diagram of another battery pack provided in an embodiment of the present application;

[0016] FIG3 is a schematic structural diagram of a CCS acquisition component provided in an embodiment of the present application;

[0017] FIG4 is an enlarged schematic diagram of point A in FIG3 ;

[0018] FIG. 5 is an enlarged schematic diagram of point B in FIG. 4 .

[0019] In the picture:

[0020] 1. Battery module; 11. Battery cell; 2. CCS collection assembly; 21. Busbar; 211. Glue slot; 22. Collection harness; 221. Connector; 222. Collection wire; 2221. Main body; 2222. Collection part; 223. Collection terminal; 23. First foam; 231. Main body; 232. First connecting part; 2321. Connecting end; 2322. Free end; 233. First connecting port; 24. Fixing plate; 241. Second connecting port; 242. Wire tie hole; 243. Fourth connecting port; 25. Second foam; 251. Third connecting port.

[0021] Modes for Carrying Out the Invention

[0022] The present application is described below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are intended to explain the present application, not to limit the present application. It should also be noted that, for ease of description, the accompanying drawings show only some, but not all, structures related to the present application.

[0023] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. A person of ordinary skill in the art will be able to understand the meaning of the above terms in this application according to the circumstances.

[0024] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may indicate that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may indicate that the first feature is at a lower level than the second feature.

[0025] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0026] As shown in Figures 1 to 5, the battery pack of an embodiment of the present application includes a battery module 1 and a CCS collection assembly 2. The CCS collection assembly 2 includes a bus 21, a collection harness 22, and a first foam 23. The bus 21 is configured to connect to the battery module 1, and the collection harness 22 is connected to the bus 21. The first foam 23 is disposed on the battery module 1 and is configured to absorb electrolyte leaked from the explosion-proof valves of the battery cells 11 within the battery module 1. The provision of the first foam 23 can block and absorb electrolyte leaked from the explosion-proof valves of the battery cells 11 to a certain extent, thereby reducing the possibility of electrolyte from individual battery cells 11 splashing onto adjacent battery cells 11 and affecting normal use. It can also reduce the effects of electrolyte leakage on the CCS collection assembly 2, such as corrosion, thereby effectively protecting electrical components and improving the safety of the CCS collection assembly 2 and the entire battery module 1. The first foam 23 includes a main body 231 and a first connecting portion 232. The main body 231 is provided with a first connecting port 233 corresponding to the explosion-proof valve of each battery cell 11 in the battery module 1. The first connecting portion 232 is arranged in the first connecting port 233, and the first connecting portion 232 has a connecting end 2321 connected to the cavity wall of the first connecting port 233 and a free end 2322 separated from the cavity wall of the first connecting port 233. The free end 2322 can rotate along the connecting end 2321 under the drive of the electrolyte sprayed by the explosion-proof valve. For example, the length of the first connecting portion 232 extends along a first direction (the first direction is the X direction in the figure), one end of the first connecting portion 232 along the first direction is connected to the cavity wall of the first connecting port 233, and the first connecting portion 232 is spaced from the cavity wall of the first connecting port 233 on both sides along the second direction (the second direction is the Y direction in the figure), that is, the connection state between the first connecting portion 232 and the main body 231 can be maintained, and the free end portion 2322 can rotate around the connecting end portion 2321 under the impact of the electrolyte at the moment the explosion-proof valve explodes, that is, the first connecting portion 232 blocks, buffers and absorbs the sprayed electrolyte during the rotation process around the connecting end portion 2321, thereby reducing the occurrence of electrolyte splashing to other battery cells 11.

[0027] The battery pack also includes a box body and a box cover. The box body is provided with a receiving groove, and the battery module 1 is installed in the receiving groove. The box cover is provided with a notch of the receiving groove. The first foam 23 is provided between the battery module 1 and the box cover. The first foam 23 can support the box cover and reduce the shaking of the box cover. The first foam 23 has a certain elasticity, so that the support of the box cover by the first foam 23 will not cause it to sag or warp, and the supporting effect is good.

[0028] At least the first connection portion 232 is separated from the battery module 1 by a clearance zone, which serves as a blasting space for the explosion-proof valve. The provision of the clearance zone prevents the first connection portion 232 from blocking the explosion-proof valve, making it difficult to blast the explosion-proof valve, thereby effectively improving the safety of the battery cell 11.

[0029] In some embodiments, as shown in Figures 1, 2, and 3, the CCS collection assembly 2 further includes a fixing plate 24, on which the busbars 21 are mounted. The fixing plate 24 has a second communication port 241 corresponding to the explosion-proof valve of each battery cell 11. A first foam pad 23 is disposed on the side of the fixing plate 24 facing away from the battery module 1 and blocks the second communication port 241. The fixing plate 24 can be constructed of an insulating PC board. The installation of the fixing plate 24 strengthens the mounting strength of each busbar 21 to the fixing plate 24, thereby ensuring the connection strength between the CCS collection assembly 2 and the battery module 1. In other embodiments, the busbars 21 can be pre-mounted on the fixing plate 24 and then aligned with the battery module 1. This ensures that all busbars 21 are aligned with each battery cell in the battery module 1, thus enhancing the installation convenience of the CCS collection assembly 2.

[0030] Furthermore, as shown in Figures 1, 2, and 3, the first foam 23 is positioned on the side of the fixing plate 24 away from the battery module 1, that is, between the fixing plate 24 and the box cover. This effectively enhances the support between the fixing plate 24 and the box cover, and the first connecting portion 232 is prevented from flipping over under the impact of the electrolyte by the box cover. This allows the first connecting portion 232 to continue absorbing and buffering the electrolyte under the impact of the electrolyte, preventing the first connecting portion 232 from completely flipping over and causing the electrolyte to splash onto the box cover and flow into other battery cells 11. Furthermore, the provision of the second connecting port 241 provides a space to avoid the explosion of the explosion-proof valve, thereby improving the safety of the explosion-proof valve.

[0031] The CCS collection assembly 2 also includes a second foam pad 25, positioned between the fixing plate 24 and the battery module 1. The second foam pad 25 has a third communication port 251 corresponding to the explosion-proof valve of each battery cell 11. The third communication port 251 communicates with the second communication port 241. The second foam pad 25 not only strengthens the connection and support between the battery module 1 and the fixing plate 24, but also absorbs leaked electrolyte from the battery cell 11, minimizing the risk of electrolyte leakage affecting other battery cells 11 or the CCS collection assembly 2 and reducing the risk of thermal runaway in the battery pack.

[0032] The CCS collection assembly 2 also includes a tie-wrap. The length of the collection harness 22 extends along a first direction. The fixed plate 24 is provided with a plurality of tie-wrap holes spaced apart along the first direction. Each tie-wrap hole group includes at least two tie-wrap holes 242 spaced apart along a second direction. The tie-wrap is configured to bundle the collection harness 22 between the two tie-wrap holes 242 within each tie-wrap hole group, wherein the first direction is arranged at an angle to the second direction. In this embodiment, each tie-wrap hole group includes two tie-wrap holes 242 spaced apart along the second direction. The tie-wrap can be directly formed using a cable tie. The cable tie is passed through the two tie-wrap holes 242 to bundle the collection harness 22 to the fixed plate 24, thereby enhancing the connection strength of the collection harness 22.

[0033] A fourth connecting port 243 is provided on the fixing plate 24 corresponding to the tab of each battery cell 11 in the battery module 1, and part of the busbar 21 can pass through the fourth connecting port 243 to connect to the tab. The provision of the fourth connecting port 243 facilitates the connection between the busbar 21 and the tab of the battery cell 11. A positioning groove is provided on the side of the fixing plate 24 facing the busbar 21, and a positioning portion is provided on the side of the busbar 21 facing the fixing plate 24. The positioning portion is inserted into the positioning groove. The matching connection between the positioning portion and the positioning groove can effectively improve the connection accuracy between the busbar 21 and the fixing plate 24. In addition, it is not limited to providing the positioning portion on the side of the busbar 21 facing the fixing plate 24 and providing the positioning slot on the side of the fixing plate 24 facing the busbar 21. The positioning portion can also be provided on the side of the fixing plate 24 facing the busbar 21 and the positioning slot on the side of the busbar 21 facing the fixing plate 24.

[0034] In other embodiments, as shown in Figures 3 and 4, the collection harness 22 includes at least one connector 221, each connector 221 being connected to a group of collection wires 222. Each group of collection wires 222 includes multiple collection wires 222 arranged in a row. One end of each collection wire 222 is connected to the connector 221, and the other end is provided with a collection terminal 223, which is connected to the bus 21. A connector 221 having multiple mutually flush interfaces is provided at one end of the collection harness 22, so that all collection wires 222 connected thereto remain flat. The multiple collection wires 222 of varying lengths are arranged side by side, with all collection ends evenly arranged on one side of the collection harness 22. This side-by-side arrangement facilitates maintenance of the collection harness 22, and is based on the collection wires 222, without introducing new structures, resulting in high economic benefits.

[0035] In this embodiment, the battery module 1 includes a plurality of battery cells 11 arranged along a first direction, and each battery cell 11 includes two tabs spaced apart along a second direction. That is, the CCS collection assembly 2 is provided with two rows of busbars 21 arranged along the second direction. Therefore, the collection harness 22 includes two connectors 221 spaced apart along the second direction. Each connector 221 is connected to the collection terminal 223 via a collection wire 222 to connect to the same row of busbars 21, thereby reducing the entanglement of the collection wire 222.

[0036] As shown in Figure 4, the collection wire 222 includes a main body 2221, a collection portion 2222, and a second connecting portion. The main body 2221 is connected to the connector 221, and the collection portion 2222 is connected to the collection terminal 223. The collection portion 2222 is connected to the main body 2221 via the second connecting portion. The main body 2221 extends along a first direction, while the collection portion 2222 extends along a second direction. The first and second directions are perpendicular. By arranging the main body 2221 and the collection portion 222 perpendicularly, the length of the collection wire 222 from the collection terminal 223 to the connector 221 is maximized. This allows the collection wire 222 to resist the pull of the collection wire 222 caused by the expansion of the battery cell 11, preventing the collection terminal 223 from being pulled off by the pull of the collection wire 222, thereby improving the safety of the collection harness 22. The shorter the second connecting portion, the longer the collection wire 222 distance required from the collection terminal 223 to the connector 221.

[0037] A glue groove 211 is recessed in the busbar 21, and the collection terminal 223 is inserted into the glue groove 211. The coordinated arrangement of the collection terminal 223 and the glue groove 211 improves the accuracy of the thermal adhesive injection when connecting the collection terminal 223 to the fixing plate 24, while also reducing the amount of thermal adhesive injected, thereby reducing the spread of thermal adhesive and improving the connection strength and installation accuracy of the collection terminal 223 and the fixing plate 24.

Claims

1. A battery pack, comprising: Battery module (1), A battery contact system CCS collection component (2), the CCS collection component (2) comprising a bus bar (21), a collection harness (22) and a first foam (23), the bus bar (21) being arranged to be connected to the battery module (1), the collection harness (22) being connected to the bus bar (21), the first foam (23) being arranged on the battery module (1), the first foam (23) comprising a main body (231) and a first connecting part (232), the main body (231) corresponding to the battery module ( 1) The explosion-proof valve of each battery cell is provided with a first communication port (233), the first connection portion (232) is arranged in the first communication port (233), and the first connection portion (232) has a connection end portion (2321) connected to the cavity wall of the first communication port (233) and a free end portion (2322) spaced from the cavity wall of the first communication port (233), and the free end portion (2322) is arranged to rotate along the connection end portion (2321) to buffer and absorb the electrolyte sprayed by the explosion-proof valve.

2. The battery pack according to claim 1, wherein: The first connection portion (232) and the battery module (1) are spaced apart to form an escape zone.

3. The battery pack according to claim 1 or 2, wherein: The CCS collection assembly (2) further comprises a fixing plate (24), the busbar (21) being arranged on the fixing plate (24), the fixing plate (24) being provided with a second communication port (241) corresponding to the explosion-proof valve of each battery cell, and the first foam (23) being arranged on a side of the fixing plate (24) away from the battery module (1) and blocking the second communication port (241).

4. The battery pack according to claim 3, wherein: The CCS collection assembly (2) further comprises a second foam (25), the second foam (25) being arranged between the fixing plate (24) and the battery module (1), and the second foam (25) being provided with a third communication port (251) corresponding to the explosion-proof valve of each battery cell, the third communication port (251) being in communication with the second communication port (241).

5. The battery pack according to claim 3 or 4, wherein: The CCS collection assembly (2) further comprises a wire tying member, the length of the collection wire harness (22) extends along a first direction, a plurality of wire tying hole groups are arranged on the fixing plate (24) at intervals along the first direction, each wire tying hole group comprises at least two wire tying holes (242) arranged at intervals along a second direction, and the wire tying member is arranged to tie the collection wire harness (22) between two wire tying holes in each wire tying hole group, wherein the first direction is arranged at an angle to the second direction.

6. The battery pack according to any one of claims 3 to 5, wherein: A fourth communication opening (243) is provided on the fixing plate (24) corresponding to the pole lug of each battery cell, and part of the busbar (21) can pass through the fourth communication opening (243) to be connected to the pole lug.

7. The battery pack according to any one of claims 3 to 6, wherein: One of the two adjacent side surfaces of the fixing plate (24) and the busbar (21) is provided with a protruding positioning portion, and the other is provided with a positioning groove, wherein the positioning portion is inserted into the positioning groove.

8. The battery pack according to any one of claims 1 to 7, wherein: The collection wire harness (22) comprises at least one connector (221), each connector (221) being connected to a group of collection wire groups, each group of collection wire groups comprising a plurality of collection wires (222) arranged in a row, one end of each collection wire (222) being connected to the connector (221), and the other end being provided with a collection terminal (223), the collection terminal (223) being connected to the busbar (21).

9. The battery pack according to claim 8, wherein: The collecting wire (222) comprises a main body (2221), a collecting part (2222) and a second connecting part, the main body (2221) is connected to the connector (221), the collecting part (2222) is connected to the collecting terminal (223), the collecting part (2222) is connected to the main body (2221) via the second connecting part, the length of the main body (2221) extends along a first direction, and the length of the collecting part (2222) extends along a second direction, wherein the first direction is arranged perpendicular to the second direction.

10. The battery pack according to claim 8 or 9, wherein: The busbar (21) is recessed with a glue groove (211), and the collection terminal (223) is inserted into the glue groove (211).

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