Battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack, which comprises a battery module and a CCS acquisition assembly, the CCS acquisition assembly comprises a busbar, an acquisition wire harness and a first foam, the busbar is used for connecting the battery module, the acquisition wire harness is connected with the busbar, the first foam is arranged on the battery module, the first foam comprises a body part and a first connecting part, and the body part is connected with the first connecting part. The body part is provided with a first communication port corresponding to the anti-explosion valve of each battery cell, and the first connecting part rotates to buffer and absorb electrolyte sprayed by the anti-explosion valves. According to the battery pack disclosed by the utility model, due to the arrangement of the first foam, electrolyte leaked from the battery explosion-proof valve in the battery module can be blocked and absorbed to a certain extent, the situation that normal use is influenced because the electrolyte of an individual battery is sputtered to other adjacent batteries is reduced, and the influence of corrosion and the like on the CCS acquisition component due to the leakage of the electrolyte can be reduced, so that the service life of the battery pack is prolonged. Therefore, electrical components can be well protected, and the use safety of the CCS acquisition assembly and the whole battery module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] When the battery is in thermal runaway, it will quickly release the electric energy and chemical energy stored inside, causing the internal electrolyte and chemical substances to decompose rapidly, generating a large amount of gas, and then causing the pressure inside the battery to rise sharply. To ensure the use safety of new energy vehicles, signals are transmitted between the batteries in the battery module of the new energy vehicle and the battery management system through a CCS signal acquisition component. Moreover, in order to prevent the battery inner wall pressure from being too high and exploding, a battery explosion-proof valve for pressure relief is often provided on the battery.

[0003] However, when the existing batteries are assembled into a battery module, the explosion-proof valves are exposed. Thus, when a certain battery undergoes thermal runaway, the high-temperature electrolyte discharged after the explosion-proof valve bursts will affect the adjacent batteries and may be discharged onto the CCS signal acquisition component, affecting the use of the entire CCS signal acquisition component, and posing a safety hazard during the use of the battery module. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery pack, which has a simple structure, and can absorb the electrolyte through the first foam, ensuring the use safety of the CCS component and the overall battery pack.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] Provide a battery pack, including a battery module and a CCS acquisition component. The CCS acquisition component includes a busbar, a collection wire harness, and a first foam. The busbar is used to connect the battery module. The collection wire harness is connected to the busbar. The first foam is arranged on the battery module. The first foam includes a body part and a first connection part. The body part is provided with a first communication port corresponding to the explosion-proof valves of each battery cell in the battery module. The first connection part is arranged in the first communication port, and the first connection part has a connection end connected to the 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 arranged to rotate along the connection end to buffer and absorb the electrolyte ejected by the explosion-proof valve.

[0007] As a preferred solution of the battery pack, a clearance area is formed between the first connection part and the battery module.

[0008] As a preferred solution of the battery pack, the CCS acquisition component further includes a fixing plate, the bus bar is arranged on the fixing plate, the fixing plate is provided with second communication ports corresponding to the explosion-proof valves of the respective battery cells, and the first foam is arranged on the side of the fixing plate away from the battery module and blocks the second communication ports.

[0009] As a preferred solution of the battery pack, the CCS acquisition component further includes a second foam, the second foam is arranged between the fixing plate and the battery module, and the second foam is provided with third communication ports corresponding to the explosion-proof valves of the respective battery cells, and the third communication ports are communicated with the second communication ports.

[0010] As a preferred solution of the battery pack, the CCS acquisition component further includes a wire tying member, the length of the acquisition wire harness extends in a first direction, a plurality of groups of wire tying hole groups are arranged at intervals along the first direction on the fixing plate, each group of wire tying hole groups includes at least two wire tying holes arranged at intervals in a second direction, and the wire tying member is configured to tie the acquisition wire harness between the two wire tying holes in each group of wire tying hole groups, wherein the first direction and the second direction are arranged at an angle.

[0011] As a preferred solution of the battery pack, the fixing plate is provided with fourth communication ports corresponding to the tabs of the respective battery cells, and part of the bus bar can pass through the fourth communication ports to be connected to the tabs.

[0012] As a preferred solution of the battery pack, a positioning portion protrudes from one of the two adjacent side surfaces of the fixing plate and the bus bar, and a positioning groove is arranged on the other, and the positioning portion is inserted into the positioning groove.

[0013] As a preferred solution of the battery pack, the acquisition wire harness includes at least one connector, each connector connects a group of acquisition wire groups, each group of acquisition wire groups includes a plurality of acquisition wires arranged in a row, one end of each acquisition wire is connected to the connector, and the other end is provided with an acquisition terminal, and the acquisition terminal is connected to the bus bar.

[0014] As a preferred solution of the battery pack, the acquisition wire includes a main body portion, an acquisition portion and a second connection portion, the main body portion is connected to the connector, the acquisition portion is connected to the acquisition terminal, the acquisition portion is connected to the main body portion through the second connection portion, the length of the main body portion extends in a first direction, and the length of the acquisition portion extends in a second direction, wherein the first direction and the second direction are perpendicular to each other.

[0015] As a preferred solution of the battery pack, a glue groove is recessed on the bus bar, and the acquisition terminal is inserted into the glue groove.

[0016] Advantages of the present utility model: Through the provision of the first foam, it can block and absorb a certain amount of the electrolyte discharged from the explosion-proof valve of the battery in the battery module, reducing the situation where the electrolyte of individual batteries splashes onto adjacent other batteries and affects normal use, and can also reduce the corrosion and other effects of the discharged electrolyte on the CCS acquisition component, which can better protect electrical components and improve the use safety of the CCS acquisition component and the overall battery module; through the setting that the free end is spaced from the cavity wall of the first communication port and can rotate along the connecting end, the free end can rotate around the connecting end under the impact of the electrolyte at the moment when the explosion-proof valve bursts, and the free end blocks, buffers and absorbs the ejected electrolyte during the rotation process, further reducing the situation where the electrolyte splashes onto other batteries. Description of the Drawings

[0017] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0018] Figure 1 is a schematic structural diagram of the battery pack according to an embodiment of the present utility model Figure 1 ;

[0019] Figure 2 is a schematic structural diagram of the battery pack according to an embodiment of the present utility model Figure 2 ;

[0020] Figure 3 is a schematic structural diagram of the CCS acquisition component according to an embodiment of the present utility model;

[0021] Figure 4 is Figure 3 an enlarged schematic diagram of part A of

[0022] Figure 5 is Figure 4 an enlarged schematic diagram of part B of

[0023] In the figure:

[0024] 1. Battery module; 11. Battery cell; 2. CCS acquisition component; 21. Busbar; 211. Glue groove; 22. Acquisition wire harness; 221. Connector; 222. Acquisition wire; 2221. Main body part; 2222. Acquisition part; 223. Acquisition terminal; 23. First foam; 231. Body part; 232. First connection part; 2321. Connection end; 2322. Free end; 233. First communication port; 24. Fixed plate; 241. Second communication port; 242. Wire tying hole; 243. Fourth communication port; 25. Second foam; 251. Third communication port. Detailed Embodiment

[0025] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0026] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0028] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] Such as Figures 1 to 5As shown in the figure, the battery pack of the embodiment of the present utility model includes a battery module 1 and a CCS acquisition component 2. The CCS acquisition component 2 includes a bus bar 21, an acquisition wire harness 22, and a first foam 23. The bus bar 21 is used to connect the battery module 1. The acquisition wire harness 22 is connected to the bus bar 21. The first foam 23 is disposed on the battery module 1 and is used to absorb the electrolyte discharged from the explosion-proof valve of the battery cells 11 in the battery module 1. It can be understood that through the setting of the first foam 23, the electrolyte discharged from the explosion-proof valve of the battery cells 11 can be blocked and absorbed to a certain extent, reducing the situation that the electrolyte of individual battery cells 11 splashes onto adjacent other battery cells 11 and affecting normal use, and can reduce the corrosion and other effects of the electrolyte leakage on the CCS acquisition component 2, which can better protect electrical components and improve the use safety of the CCS acquisition component 2 and the overall battery module 1. The first foam 23 includes a body portion 231 and a first connecting portion 232. The body portion 231 is provided with a first communication port 233 corresponding to the explosion-proof valves of the battery cells 11 in the battery module 1. The first connecting portion 232 is disposed in the first communication port 233, and the first connecting portion 232 has a connecting 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. The free end portion 2322 can rotate along the connecting end portion 2321 under the drive of the electrolyte sprayed by the explosion-proof valve. For example, the length of the first connecting portion 232 extends in the first direction (the first direction is the X direction shown in the figure). One end of the first connecting portion 232 in the first direction is connected to the cavity wall of the first communication port 233, and both sides of the first connecting portion 232 in the second direction are spaced from the cavity wall of the first communication port 233 (the second direction is the Y direction shown in the figure), that is, the connection state between the first connecting portion 232 and the body portion 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 of explosion-proof valve explosion, that is, the first connecting portion 232 blocks, buffers and absorbs the sprayed electrolyte during the rotation around the connecting end portion 2321, reducing the situation of electrolyte splashing onto other battery cells 11.

[0030] Optionally, the battery pack further includes a box body and a box cover. The box body is provided with a receiving groove, the battery module 1 is installed in the receiving groove, the box cover is used to seal the notch of the receiving groove, the first foam 23 is disposed between the battery module 1 and the box cover. The first foam 23 can support the box cover, reduce the shaking of the box cover, and the first foam 23 has a certain elasticity, so that the support of the first foam 23 on the box cover will not cause sagging or warping, and the support effect is good.

[0031] Furthermore, at least a clearance area is formed between the first connecting portion 232 and the battery module 1, and the clearance area is used as the explosion space of the explosion-proof valve. Through the setting of the clearance area, the situation that the first connecting portion 232 blocks the explosion-proof valve and makes it difficult for the explosion-proof valve to explode is avoided, effectively improving the use safety of the battery cells 11.

[0032] In some embodiments, as Figure 1 , Figure 2 and Figure 3 shown, the CCS acquisition component 2 further includes a fixing plate 24. The bus bar 21 is arranged on the fixing plate 24. The fixing plate 24 is provided with second communication ports 241 corresponding to the explosion-proof valves of the respective battery cells 11. The first foam 23 is arranged on the side of the fixing plate 24 away from the battery module 1 and seals the second communication ports 241. The fixing plate 24 can adopt a PC board structure with insulation properties. Through the arrangement of the fixing plate 24, the installation strength between each bus bar 21 and the fixing plate 24 can be enhanced, thereby ensuring the connection strength between the CCS acquisition component 2 and the battery module 1. In other embodiments, the bus bar 21 can also be pre-installed on the fixing plate 24, and then the fixing plate 24 is arranged in position on the battery module 1, so that the alignment installation of all the bus bars 21 and the respective battery cells of the battery module 1 can be completed, improving the installation convenience of the CCS acquisition component 2.

[0033] In addition, as Figure 1 , Figure 2 and Figure 3 shown, by arranging the first foam 23 on the side of the fixing plate 24 away from the battery module 1, that is, the first foam 23 is arranged between the fixing plate 24 and the box cover, the support between the fixing plate 24 and the box cover can be effectively improved. Moreover, when the first connecting portion 232 flips under the impact of the electrolyte, it can be blocked by the box cover, so that the first connecting portion 232 can still always maintain the absorption and buffering of the electrolyte under the impact of the electrolyte, avoiding the situation that the first connecting portion 232 completely flips and causes the electrolyte to splash onto the box cover and flow to other battery cells 11. And the arrangement of the second communication ports 241 can provide an avoidance space for the explosion of the explosion-proof valve, improving the use safety of the explosion-proof valve.

[0034] Furthermore, the CCS acquisition component 2 further includes a second foam 25. The second foam 25 is arranged between the fixing plate 24 and the battery module 1, and the second foam 25 is provided with third communication ports 251 corresponding to the explosion-proof valves of the respective battery cells 11. The third communication ports 251 are communicated with the second communication ports 241. Through the arrangement of the second foam 25, on the one hand, the connection support of the battery module 1 to the fixing plate 24 can be strengthened, and on the other hand, the electrolyte discharged from the battery cells 11 can be absorbed, reducing the influence of the discharged electrolyte on other battery cells 11 or the CCS acquisition component 2 and reducing the thermal runaway risk of the battery pack.

[0035] Optionally, the CCS acquisition component 2 further includes a wire tying member. The length of the acquisition wire harness 22 extends along the first direction. A plurality of groups of wire tying hole groups are arranged at intervals along the first direction on the fixing plate 24. Each group of wire tying hole groups includes at least two wire tying holes 242 arranged at intervals along the second direction. The wire tying member is arranged to tie the acquisition wire harness 22 between the two wire tying holes 242 in each group of wire tying hole groups. Among them, the first direction and the second direction are arranged at an angle. In this embodiment, each group of wire tying hole groups includes two wire tying holes 242 arranged at intervals along the second direction. The wire tying member can directly adopt a wire tie. The wire tie is used to pass through the two wire tying holes 242 to tie the acquisition wire harness 22 on the fixing plate 24, improving the connection strength of the acquisition wire harness 22.

[0036] Furthermore, fourth communication ports 243 are formed on the fixing plate 24 corresponding to the tabs of each battery cell 11 in the battery module 1. Part of the bus bar 21 can pass through the fourth communication ports 243 to be connected to the tabs. Through the arrangement of the fourth communication ports 243, the connection convenience between the bus bar 21 and the tabs of the battery cells 11 is facilitated. A positioning groove is arranged on one side of the fixing plate 24 facing the bus bar 21. A positioning portion protrudes on one side of the bus bar 21 facing the fixing plate 24. The positioning portion is inserted into the positioning groove. Through the cooperative connection between the positioning portion and the positioning groove, the connection accuracy between the bus bar 21 and the fixing plate 24 can be effectively improved. In addition, it is not limited to arranging the positioning portion on one side of the bus bar 21 facing the fixing plate 24 and arranging the positioning groove on one side of the fixing plate 24 facing the bus bar 21. The positioning portion can also be arranged on one side of the fixing plate 24 facing the bus bar 21, and the positioning groove can be arranged on one side of the bus bar 21 facing the fixing plate 24.

[0037] In other embodiments, such as Figure 3 and Figure 4As shown in the figure, the acquisition wire harness 22 includes at least one connector 221. Each connector 221 is connected to a group of acquisition wires 222. Each group of acquisition wires 222 includes multiple acquisition wires 222 arranged in a row. One end of each acquisition wire 222 is connected to the connector 221, and the other end is provided with an acquisition terminal 223. The acquisition terminal 223 is connected to the bus bar 21. At one end of the acquisition wire harness 22, a connector 221 with several flush interfaces is provided, so that all the acquisition wires 222 connected thereto are kept flat, and several acquisition wires 222 with different lengths are arranged side by side and in contact. All the acquisition terminals are evenly arranged on one side of the acquisition wire harness 22. This side-by-side wiring method facilitates the maintenance of the acquisition wire harness 22, and is set based on the acquisition wires 222 without introducing new structures, with relatively high economic benefits. In this embodiment, the battery module 1 includes multiple battery cells 11 arranged in the first direction. Each battery cell 11 includes two tabs spaced apart in the second direction. That is, the CCS acquisition component 2 is provided with two rows of bus bars 21 arranged in the second direction. Therefore, the acquisition wire harness 22 includes two connectors 221 spaced apart in the second direction. Each connector 221 is connected to the same row of bus bars 21 through the acquisition wires 222 to connect the acquisition terminals 223, reducing the entanglement of the acquisition wires 222.

[0038] Further, as Figure 4 shown, the acquisition wire 222 includes a main body portion 2221, an acquisition portion 2222, and a second connection portion. The main body portion 2221 is connected to the connector 221, the acquisition portion 2222 is connected to the acquisition terminal 223, and the acquisition portion 2222 is connected to the main body portion 2221 through the second connection portion. The length of the main body portion 2221 extends in the first direction, and the length of the acquisition portion 2222 extends in the second direction, wherein the first direction and the second direction are perpendicularly arranged. By arranging the main body portion 2221 and the acquisition portion 2222 perpendicularly, it can be ensured that the length of the acquisition wire 222 from the acquisition terminal 223 to the connector 221 is the longest, so that the acquisition wire 222 can resist the pulling of the acquisition wire 222 caused by the expansion of the battery cell 11, avoiding the situation where the acquisition wire 222 is pulled and the acquisition terminal 223 is pulled off, and improving the use safety of the acquisition wire harness 22. Preferably, the shorter the length of the second connection portion, the longer the length of the acquisition wire 222 required for the acquisition terminal 223 to be away from the connector 221.

[0039] Furthermore, a glue groove 211 is recessed on the bus bar 21, and the acquisition terminal 223 is inserted into the glue groove 211. Through the cooperative setting of the acquisition terminal 223 and the glue groove 211, the injection position accuracy of the thermal conductive glue when the acquisition terminal 223 is connected to the fixing plate 24 can be improved, and at the same time, the injection amount of the thermal conductive glue is reduced, that is, the spread of the thermal conductive glue is reduced, and the connection strength and installation position accuracy of the acquisition terminal 223 and the fixing plate 24 are improved.

[0040] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A battery pack, characterized in that: include: Battery module, A CCS collection component, the CCS collection component includes a bus, a collection harness and a first foam, the bus is used 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 includes a main body and a first connecting part, the main body is provided with a first connecting port corresponding to the explosion-proof valve of each battery cell in the battery module, the first connecting part is arranged in the first connecting port, and the first connecting part has a connecting end connected to the cavity wall of the first connecting port and a free end spaced from the cavity wall of the first connecting port, the free end is arranged to rotate along the connecting end to buffer and absorb the electrolyte sprayed by the explosion-proof valve.

2. The battery pack according to claim 1, characterized in that: A clearance area is formed between the first connection portion and the battery module.

3. The battery pack according to claim 1, characterized in that: The CCS collection component also includes a fixing plate, the bus is arranged on the fixing plate, the fixing plate is provided with a second communication port corresponding to the explosion-proof valve of each battery cell, and the first foam is arranged on a side of the fixing plate away from the battery module and blocks the second communication port.

4. The battery pack according to claim 3, characterized in that: The CCS collection component also includes a second foam, which is arranged between the fixing plate and the battery module, and the second foam has a third communication port corresponding to the explosion-proof valve of each battery cell, and the third communication port is connected to the second communication port.

5. The battery pack according to claim 3, characterized in that: The CCS collection assembly also includes a wire tying piece, the length of the collection wire bundle extends along a first direction, a plurality of wire tying hole groups are arranged on the fixing plate at intervals along the first direction, each of the wire tying hole groups includes at least two wire tying holes arranged at intervals along a second direction, and the wire tying piece is configured to bundle the collection wire bundle between two of the wire tying holes in each of the wire tying hole groups, wherein the first direction is arranged at an angle to the second direction.

6. The battery pack according to claim 3, characterized in that: The fixing plate is provided with a fourth connecting opening corresponding to the tabs of each of the battery cells, and part of the busbars can pass through the fourth connecting opening to be connected to the tabs.

7. The battery pack according to claim 3, characterized in that: One of the two adjacent side surfaces of the fixing plate and the bus bar is protrudingly provided with a positioning portion, and the other is provided with a positioning groove, and the positioning portion is inserted into the positioning groove.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The collection harness includes at least one connector, each of which is connected to a group of collection wires, each of which includes a plurality of collection wires arranged in a row, one end of each of which is connected to the connector, and the other end of which is provided with a collection terminal, which is connected to the bus.

9. The battery pack according to claim 8, characterized in that: The collection wire includes a main body, a collection part and a second connecting part, the main body is connected to the connector, the collection part is connected to the collection terminal, and the collection part is connected to the main body through the second connecting part. The length of the main body extends along a first direction, and the length of the collection part extends along a second direction, wherein the first direction is perpendicular to the second direction.

10. The battery pack according to claim 8, characterized in that: The busbar is recessed with a glue groove, and the collection terminal is inserted into the glue groove.

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