Battery cell module and battery pack

Abstract

Provided are a battery cell module and a battery pack. The battery cell module comprises two battery cell assemblies and a sealing structure, wherein the two battery cell assemblies are spaced apart from each other in a first direction and form a spacing space. Each battery cell assembly comprises a first bracket, a plurality of battery cells and an electrical connection structure, wherein a plurality of first arrangement grooves running in the first direction are provided in the first bracket in an array; the first arrangement grooves are in communication with the spacing space; end portions of the plurality of battery cells are respectively inserted into the first arrangement grooves; the electrical connection structure mounted on the first bracket electrically connects the plurality of battery cells to one another; and first pressure relief valves of at least some of the battery cells can be in communication with the spacing space by means of the first arrangement grooves. The sealing structure surrounds and is sealingly connected to edges of the two first brackets, so as to seal the spacing space. The battery cell module can realize directional pressure relief of stacked battery cells.

Description

Battery cell modules and battery packs

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 27, 2024, with application number 202422095945.8. 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, and in particular to a battery cell module and a battery pack.

[0004] Background Art

[0005] In order to achieve directional pressure relief of battery cells, the related art often adopts a method of providing pressure relief channels corresponding to multiple battery cells in the box of the battery pack.

[0006] Technical issues

[0007] The method of setting pressure relief channels in the battery pack box corresponding to multiple battery cells requires, on the one hand, that when installing multiple battery cells into the box, multiple battery cells are aligned with the pressure relief channels on the box, which makes the installation of the battery cells difficult. On the other hand, it is necessary to ensure that the pressure relief valves of all battery cells are set adjacent to the pressure relief channels of the box, which makes it difficult to achieve multi-layer stacking of battery cells, and thus it is difficult to improve the energy density of the battery pack.

[0008] Technical Solutions

[0009] In a first aspect, an embodiment of the present application provides a battery cell module, comprising:

[0010] Two battery cell assemblies, the two battery cell assemblies are spaced apart along a first direction to form a separation space, the battery cell assembly includes a first bracket, a plurality of battery cells and an electrical connection structure, the first bracket is provided with a plurality of first setting grooves extending along the first direction, the first setting grooves are connected to the separation space, the ends of the plurality of battery cells are respectively inserted into the first setting grooves, the electrical connection structure installed on the first bracket electrically connects the plurality of battery cells to each other, and the first pressure relief valves of at least some of the battery cells can be connected to the separation space through the first setting grooves; and,

[0011] A sealing structure surrounds and is sealingly connected to edges of the two first brackets to seal the interval.

[0012] As an optional technical solution of the battery cell module, the battery cell module further includes two pressure relief plates, the two pressure relief plates are respectively arranged on two opposite sides of the two battery cell assemblies as a whole along the first direction, a pressure relief groove is provided on one side of the pressure relief plate facing the battery cell assembly, and a pressure relief opening connected to the pressure relief groove is opened on one side of the pressure relief plate along the second direction;

[0013] The battery cell assembly further includes a second bracket, the second bracket being arranged between the battery cell and the pressure relief plate, the second bracket being provided with a plurality of second arrangement grooves extending along the first direction, the second bracket being sealed and connected to the pressure relief plate, and the second arrangement grooves being communicated with the pressure relief grooves, the ends of the plurality of battery cells away from the first bracket being respectively inserted into the second arrangement grooves, and the first pressure relief valves of some of the battery cells being able to communicate with the pressure relief grooves through the second arrangement grooves;

[0014] The first direction is perpendicular to the second direction.

[0015] As an optional technical solution for the battery cell module, the battery cell assembly also includes a connecting tube, which is connected to the first bracket and the second bracket, one end of the connecting tube is connected to the partition space, and the other end of the connecting tube is located on the side facing the pressure relief opening.

[0016] As an optional technical solution for the battery cell module, a first protrusion protruding toward the periphery along the second direction is provided on one side edge of the second bracket close to the pressure relief opening, and a first connecting hole penetrating along the first direction is provided on the first protrusion. A second protrusion protruding toward the periphery along the second direction is provided on one side edge of the first bracket close to the pressure relief opening, and a second connecting hole penetrating along the first direction is provided on the second protrusion. Both ends of the connecting tube are sealed and inserted into the first connecting hole and the second connecting hole, respectively.

[0017] As an optional technical solution for the battery cell module, the pressure relief plate is provided with a limiting groove on one side of the pressure relief opening, and the limiting groove is located on the side of the pressure relief opening close to the battery cell assembly. The first protrusion is inserted into the limiting groove and sealed to the groove wall of the limiting groove.

[0018] As an optional technical solution of the battery cell module, the battery cell module also includes two fixed end plates, which are respectively arranged on two opposite sides of the outer periphery of the battery cell assembly, and the two ends of the fixed end plates are respectively connected to the two pressure relief plates.

[0019] As an optional technical solution of the battery module, the fixed end plate is provided with a connecting portion, the connecting portion is provided with a third connecting hole, and the third connecting hole is configured to allow an external fastener to pass through to connect the connecting portion to an external fixing structure; and / or,

[0020] The battery module further includes an input-output structure, which is electrically connected to the electrical connection structures of the two battery components and is provided on the fixed end plate.

[0021] As an optional technical solution of the battery module, the battery assembly further includes a foam structure, which connects the battery cells, the second bracket and the first bracket into one, and the foam fills the gaps between the multiple battery cells, the second bracket and the first bracket; and / or,

[0022] The battery core assembly further includes a mica sheet, which is stacked on a side of the first bracket away from the second bracket.

[0023] As an optional technical solution of the battery cell module, only one of the two opposite ends of the battery cell is provided with the first pressure relief valve;

[0024] Along one of the arrangement directions of the multiple battery cell arrays, the first pressure relief valves of any two adjacent battery cells are facing opposite directions; and / or, the multiple battery cells respectively included in the two battery cell assemblies are spaced one by one opposite to each other on both sides of the separation space, and among the two battery cells spaced opposite to each other, only one of the battery cells has the first pressure relief valve facing the separation space.

[0025] In a second aspect, an embodiment of the present application provides a battery pack, comprising:

[0026] A box body, the box body having a accommodating chamber and a pressure relief chamber connected to each other, the box body being provided with a second pressure relief valve, the second pressure relief valve being able to connect the pressure relief chamber to the external space of the box body;

[0027] A plurality of battery cell modules as described in the first aspect above, wherein the plurality of battery cell modules are arranged in the accommodating cavity along the first direction; and

[0028] A connecting piece is provided with a first connecting groove extending along the first direction, the connecting piece is sealed between the spaces between any two adjacent battery core modules, and the first connecting groove of at least one of the connecting pieces is connected to the pressure relief chamber.

[0029] As an optional technical solution of the battery pack, when the battery cell module further includes a pressure relief plate, a second bracket and a connecting pipe, the first connecting groove is connected to the adjacent pressure relief openings and the connecting pipe of the two battery cell modules, and the battery pack further includes a seal, which is provided with a second connecting groove. For the two pressure relief plates and the two second brackets located at the endmost ends along the first direction, the seal is sealed and connected to the pressure relief plates and the second bracket, so that the second connecting groove is connected to the pressure relief opening and the connecting pipe, and the second connecting groove is not connected to the external space.

[0030] As an optional technical solution of the battery pack, the first communicating groove includes two first sub-grooves respectively provided on two opposite sides of the communicating member along the first direction, and a second sub-groove connected between the two first sub-grooves, the first sub-groove passes through a surface of one side of the communicating member close to the pressure relief plate along the second direction, and the first sub-groove is connected to the pressure relief opening of the adjacent battery cell module and the communicating pipe; and / or,

[0031] The accommodating chamber is connected to the pressure relief chamber through a connecting hole. The battery pack includes a connecting piece that extends along the second direction to be sealed and inserted into the connecting hole. The connecting piece is inserted into the connecting hole and has a third connecting groove connected to the first connecting groove at one end.

[0032] As an optional technical solution of the battery pack, for any two adjacent battery cell modules, among the two battery cells facing each other across the pressure relief plate, only the first pressure relief valve of one battery cell faces the other battery cell.

[0033] Beneficial effects

[0034] The beneficial effects of this application are:

[0035] The battery cell module and battery pack provided in the present application are provided with a first bracket, and two battery cell assemblies are stacked and spaced to form a separation space, and the first pressure relief valves of at least some of the battery cells can be connected to the separation space through the first setting groove, so that at least some of the battery cells can be directionally relieved of pressure into the separation space.

[0036] BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic diagram of the three-dimensional structure of the battery cell module according to the embodiment.

[0038] FIG2 is a schematic three-dimensional cross-sectional view of the battery cell module according to the embodiment.

[0039] FIG3 is a schematic diagram of the structural decomposition of the battery cell module according to the embodiment.

[0040] FIG4 is a schematic diagram of the structural decomposition of the electrical connection structure, the second bracket, the first bracket, the battery cell and the foam structure according to the embodiment.

[0041] FIG5 is a schematic diagram of the three-dimensional structure of the pressure relief plate according to the embodiment.

[0042] FIG6 is a schematic diagram of the three-dimensional structure of the battery pack according to the embodiment.

[0043] FIG7 is a schematic diagram of the structural decomposition of the battery pack according to the embodiment.

[0044] FIG8 is a cross-sectional view taken along the line AA in FIG6 .

[0045] FIG9 is an enlarged schematic diagram of point M in FIG8 .

[0046] FIG10 is a schematic diagram of the three-dimensional structure of a connecting piece described in an embodiment.

[0047] FIG11 is a schematic diagram of the three-dimensional structure of another connecting member described in the embodiment.

[0048] In the picture:

[0049] 100. Battery pack;

[0050] 10. Battery cell module; 1. Pressure relief plate; 11. Pressure relief groove; 12. Pressure relief opening; 13. Limiting groove; 2. Battery cell assembly; 2a. Spacing space; 21. Second bracket; 211. Second setting groove; 212. First protrusion; 212a. First connecting hole; 22. First bracket; 221. First setting groove; 222. Second protrusion; 222a. Second connecting hole; 23. Battery cell; 231. First pressure relief valve; 24. Electrical connection structure; 25. Connecting pipe; 3. Sealing structure; 4. Foam structure; 5. Mica sheet; 6. Fixed end plate; 61. Connecting portion; 62. Third connecting hole; 7. Input / output structure; 71. Structural fixing seat; 72. Aluminum busbar;

[0051] 20, box body; 20a, accommodating chamber; 20b, pressure relief chamber; 20c, communicating hole; 201, second pressure relief valve;

[0052] 30, connecting piece; 301, first connecting groove; 301a, first sub-groove; 301b, second sub-groove; 302, third connecting groove;

[0053] 40. Sealing element; 401. Second communicating groove.

[0054] Modes for Carrying Out the Invention

[0055] The technical solutions of the embodiments of the present application will be described below in conjunction with the accompanying drawings. The described embodiments are only part of the embodiments of the present application, but not all of the embodiments.

[0056] In the description of this application, unless otherwise specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components or interactions between two components. The meanings of the above terms in this application can be understood based on actual circumstances.

[0057] In this application, unless otherwise 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.

[0058] As shown in Figures 1 to 4, the present application provides a battery cell module 10, which includes two battery cell assemblies 2 and a sealing structure 3. The two battery cell assemblies 2 are arranged at intervals along a first direction S1 to form an interval space 2a. The battery cell assembly 2 includes a first bracket 22, a plurality of battery cells 23 and an electrical connection structure 24. The first bracket 22 is arrayed with a plurality of first setting grooves 221 that pass through the first direction S1. The first setting grooves 221 are connected to the interval space 2a. The ends of the plurality of battery cells 23 are respectively inserted into the first setting grooves 221. The electrical connection structure 24 installed on the first bracket 22 electrically connects the plurality of battery cells 23 to each other, and the first pressure relief valves 231 of at least some of the battery cells 23 can be connected to the interval space 2a through the first setting grooves 221. The sealing structure 3 surrounds and is sealed and connected to the edges of the two first brackets 22 to seal the interval space 2a.

[0059] By setting the first bracket 22, and stacking and spacing the two battery cell assemblies 2 to form a spacing space 2a, and the first pressure relief valves 231 of at least some of the battery cells 23 can be connected to the spacing space 2a through the first setting groove 221, so that at least some of the battery cells 23 can be directionally relieved into the spacing space 2a.

[0060] Optionally, the battery module 10 further includes two pressure relief plates 1, which are respectively arranged on two opposite sides of the two battery cell assemblies 2 as a whole along the first direction S1. The pressure relief plate 1 is provided with a pressure relief groove 11 on the side facing the battery cell assembly 2, and a pressure relief opening 12 connected to the pressure relief groove 11 is opened on one side of the pressure relief plate 1 along the second direction S2. The battery cell assembly 2 further includes a second bracket 21, which is arranged between the battery cell 23 and the pressure relief plate 1. A plurality of second setting grooves 211 that pass through the first direction S1 are arrayed on the second bracket 21. The second bracket 21 is sealed and connected to the pressure relief plate 1, and the second setting groove 211 is connected to the pressure relief groove 11. The ends of the plurality of battery cells 23 away from the first setting groove 221 are respectively inserted into the second setting groove 211, and the first pressure relief valves 231 of some of the battery cells 23 can be connected to the pressure relief groove 11 through the second setting groove 211, wherein the first direction S1 is perpendicular to the second direction S2.

[0061] By arranging the pressure relief plate 1 and the first bracket 22, the battery cells 23 included in the battery cell assembly 2 can relieve pressure toward the partition space 2a or the pressure relief groove 11 of the pressure relief plate 1, and the gas discharged into the pressure relief groove 11 can be directed to be relieved to the outside of the battery cell module 10 through the pressure relief opening 12, so that the battery cell module 10 can realize the directional pressure relief of the stacked battery cells 23 toward the external space.

[0062] In addition, the pressure relief plate 1 can also prevent the high-temperature and high-pressure gas in the battery module 10 from being directly sprayed toward other adjacent structures, thereby reducing heat diffusion and reducing the impact of thermal runaway of the battery cell 23 in the battery module 10 on other external structures.

[0063] Optionally, the battery cell assembly 2 also includes a connecting tube 25, which is connected to the first bracket 22 and the second bracket 21, and one end of the connecting tube 25 is connected to the partition space 2a, and the other end of the connecting tube 25 is located on the side facing the pressure relief opening 12, so that the partition space 2a can be connected to the external space through the connecting tube 25, so that the gas leaked into the partition space 2a can be directionally relieved to the outside of the battery cell module 10 through the connecting tube 25.

[0064] Optionally, there may be multiple connecting tubes 25 connected to the partition space 2a from the same side of the partition space 2a along the first direction S1, so that the pressure relief flow from the partition space 2a to the external space can be improved by increasing the number of connecting tubes 25, thereby improving the pressure relief efficiency of the partition space 2a to the external space.

[0065] Optionally, the sealing structure 3 may include a sealing strip, and the sealing strip is pasted around the two first brackets 22 to seal the separation space 2 a and the external space of the battery cell module 10 .

[0066] Optionally, a first protrusion 212 protruding toward the periphery along the second direction S2 is provided on a side edge of the second bracket 21 near the pressure relief opening 12, and a first connection hole 212a is provided on the first protrusion 212 that passes through along the first direction S1. A second protrusion 222 protruding outward along the second direction S2 is provided on a side edge of the first bracket 22 near the pressure relief opening 12, and a second connection hole 222a is provided on the second protrusion 222 that passes through along the first direction S1. Both ends of the connecting tube 25 are sealed and inserted into the first connection hole 212a and the second connection hole 222a, respectively, so as to avoid the connecting tube 25 occupying the setting space between the second bracket 21 and the first bracket 22, so that more battery cells 23 can be set between the second bracket 21 and the first bracket 22.

[0067] Please refer to Figure 5. Optionally, a limiting groove 13 is provided on one side of the pressure relief opening 12 of the pressure relief plate 1. The limiting groove 13 is located on the side of the pressure relief opening 12 close to the battery cell assembly 2. The first protrusion 212 is inserted into the limiting groove 13 and is sealed to the groove wall of the limiting groove 13, so that the first protrusion 212 can be limited by the limiting groove 13 to improve the assembly accuracy of the second bracket 21 and the pressure relief plate 1.

[0068] Optionally, the limiting groove 13 may be connected to the pressure relief opening 12 , so that the limiting groove 13 and the pressure relief opening 12 can more efficiently utilize the limited installation space of the side surface of the pressure relief plate 1 along the second direction S2 .

[0069] Exemplarily, along the third direction S3, the size of the limiting groove 13 is larger than the size of the pressure relief opening 12, so that a step surface is formed at the connection between the limiting groove 13 and the pressure relief opening 12, and the step surface can abut and be sealed against the first protrusion 212 to prevent the first protrusion 212 from entering the pressure relief opening 12, thereby preventing the first protrusion 212 from affecting the pressure relief function of the pressure relief opening 12, wherein the third direction S3 is perpendicular to the first direction S1 and the second direction S2.

[0070] Please refer to Figures 2 to 4 again. Optionally, the battery cell assembly 2 further includes a foam structure 4, which connects the battery cell 23, the second bracket 21 and the first bracket 22 as a whole, and the foam fills the gaps between the multiple battery cells 23, the second bracket 21 and the first bracket 22. Therefore, on the one hand, the battery cell 23, the second bracket 21 and the first bracket 22 can be fixed by the foam structure 4, so that the battery cell 23, the second bracket 21 and the first bracket 22 can be disassembled and assembled as a whole. On the other hand, The gap between the battery cell 23 and the second bracket 21 and the first bracket 22 can be sealed by the foam glue to prevent the gas from leaking from the gap between the battery cell 23 and the second bracket 21 and the first bracket 22 to the adjacent battery cell 23 when the battery cell 23 is depressurized, causing the adjacent battery cell 23 to also experience thermal runaway. On the other hand, the good thermal insulation and flame retardant properties of the foam glue can be used to reduce the heat at the battery cell 23 experiencing thermal runaway and the impact of the flame on the surrounding battery cells 23, so as to avoid chain thermal runaway of multiple battery cells 23.

[0071] Optionally, the battery cell assembly 2 also includes a mica sheet 5, which is stacked on the side of the first bracket 22 away from the second bracket 21, so that the good heat resistance, flame retardancy and insulation properties of the mica sheet 5 can be utilized. On the one hand, when the battery cell 23 is depressurized toward the spacing space 2a, the depressurized high-temperature gas can be blocked to a certain extent to reduce the impact of the high-temperature gas on the battery cells 23 of the adjacent battery cell assemblies 2. On the other hand, it can avoid the battery cells 23 of the two adjacent battery cell assemblies 2 from being electrically conductive.

[0072] Optionally, the mica sheet 5 may be provided with a plurality of through holes extending along the first direction S1 , so that the mica sheet 5 can play a certain flame retardant role while also ensuring the pressure relief efficiency of the battery cell 23 to the spacing space 2a through the through holes.

[0073] Optionally, the battery cell assembly 2 also includes a foam structure 4, which connects the battery cell 23 and the first bracket 22 into one, and the foam fills the gaps between the multiple battery cells 23 and the first bracket 22; and / or, the battery cell assembly 2 also includes a mica sheet 5, which is stacked on the side of the first bracket 22 away from the battery cell 23.

[0074] Optionally, only one of the two opposite ends of the battery cell 23 is provided with a first pressure relief valve 231 , so that one battery cell 23 can only relieve pressure to one of the separation space 2a and the pressure relief groove 11 , thereby improving the certainty of the pressure relief direction of the battery cell 23 .

[0075] Optionally, along one of the arrangement directions of the array of multiple battery cells 23, the first pressure relief valves 231 of any two adjacent battery cells 23 face opposite directions, so that the pressure relief directions of two adjacent battery cells 23 along one of the arrangement directions of the array of multiple battery cells 23 can be opposite, thereby making the pressure relief positions of the multiple battery cells 23 of the battery cell assembly 2 more dispersed when the pressure is relieved at the same time, and reducing the impact of the high-temperature and high-pressure gas generated by the pressure relief on the adjacent battery cells 23.

[0076] Exemplarily, a plurality of battery cells 23 may be arranged in an array along a third direction S3 and a fourth direction S4, respectively, so that along the third direction S3, the first pressure relief valves 231 of any two adjacent battery cells 23 may be directed in opposite directions, or, along the fourth direction S4, the first pressure relief valves 231 of any two adjacent battery cells 23 may be directed in opposite directions, wherein the third direction S3 forms an angle with the fourth direction S4, and the fourth direction S4 is perpendicular to the first direction S1, and, in some embodiments, the fourth direction S4 may be parallel to the second direction S2.

[0077] In addition, since under normal circumstances, the two opposite ends of the battery cell 23 are respectively provided with a positive pole and a negative pole, and the first pressure relief valve 231 is usually only provided at the same end as one of the positive pole and the negative pole, in other words, the first pressure relief valves 231 of all the battery cells 23 can be provided at the same end as the positive pole, or the first pressure relief valves 231 of all the battery cells 23 can be provided at the same end as the negative pole. Therefore, such an arrangement can also make the positive and negative pole directions of any two adjacent battery cells 23 opposite along one of the arrangement directions of the array of multiple battery cells 23, thereby facilitating the electrical connection structure 24 to electrically connect the two adjacent battery cells 23 from the same side of the multiple battery cells 23 along the first direction S1.

[0078] Optionally, the multiple battery cells 23 included in the two battery cell assemblies 2 are spaced opposite to each other on both sides of the partition space 2a. Among the two battery cells 23 spaced opposite to each other, only the first pressure relief valve 231 of one battery cell 23 is facing the partition space 2a, thereby preventing the high-temperature and high-pressure gas released when the battery cell 23 is depressurized toward the partition space 2a, directly heating the first pressure relief valve 231 of the battery cell 23 spaced opposite to each other, and inducing thermal runaway of the battery cell 23 spaced opposite to each other.

[0079] Optionally, along one of the arrangement directions of the array of multiple battery cells 23, the first pressure relief valves 231 of any two adjacent battery cells 23 are facing opposite directions, and among the two battery cells 23 facing each other across the interval space 2a, only the first pressure relief valve 231 of one battery cell 23 is facing the interval space 2a, so that the battery cell module 10 has better performance in preventing heat diffusion and thermal runaway chain reaction.

[0080] Optionally, the battery cell module 10 also includes two fixed end plates 6, which are respectively arranged on two opposite sides of the outer periphery of the battery cell assembly 2, and the two ends of the fixed end plates 6 are respectively connected to the two pressure relief plates 1, so that the two pressure relief plates 1 can be connected and fixed by the fixed end plates 6, so that the overall structural stability of the battery cell module 10 is better, and it is less likely for parts to fall off, and it is more convenient to disassemble and assemble the battery cell module 10 as a whole to other structures, for example, it is convenient to disassemble and assemble the battery cell module 10 as a whole to the battery pack 100.

[0081] Optionally, the fixed end plate 6 is provided with a connecting portion 61, and the connecting portion 61 is provided with a third connecting hole 62. The third connecting hole 62 is configured for an external fastener to pass through to connect the connecting portion 61 to an external fixed structure, so as to facilitate the external fastener to fasten the battery cell module 10 as a whole to the external fixed structure.

[0082] Optionally, the electrical connection structure 24 may include an integrated busbar (Cells Contact System, CCS), and the second bracket 21 and the first bracket 22 may be provided with an electrical connection structure 24 so as to electrically connect the battery cells 23 included in the battery cell assembly 2 through the CCS.

[0083] Optionally, the battery cell module 10 further includes an input-output structure 7, which is electrically connected to the electrical connection structure 24 of the two battery cell assemblies 2, that is, all the battery cells 23 included in the battery cell module 10 can be connected to the external circuit as a whole through the input-output structure 7.

[0084] Optionally, the input-output structure 7 is provided on the fixed end plate 6, so that on the one hand, the relative position of the input-output structure 7 and the two battery cell assemblies 2 can be stabilized, which is conducive to maintaining the stability of the electrical connection relationship between the input-output structure 7 and the electrical connection structure 24 of the two battery cell assemblies 2; on the other hand, the input-output structure 7 and the fixed end plate 6 can be located on the same side of the battery cell module 10 as a whole, so that when the operator disassembles the battery cell module 10 to the external structure, the battery cell module 10 can be fixed or disassembled to the external fixed structure through the fixed end plate 6 from the same side, and the battery cell module 10 can be electrically connected or disconnected to the external circuit through the input-output structure 7, which can simplify the operator's disassembly and assembly operations.

[0085] Please refer to Figure 1. For example, two battery cell assemblies 2 can be connected in series, and the input-output structure 7 can include a structural fixing seat 71 and two aluminum bars 72. The structural fixing seat 71 is arranged on the fixed end plate 6. The two aluminum bars 72 are both arranged on the structural fixing seat 71, and the two aluminum bars 72 are respectively electrically connected to the electrical connection structures 24 of the two battery cell assemblies 2, so that the two aluminum bars 72 can be fixed to the fixed end plate 6 through the structural fixing seat 71, and the two aluminum bars 72 form the input and output aluminum bars of the two battery cell assemblies 2 as a whole.

[0086] As shown in Figures 6 to 9, the present application also provides a battery pack 100, including a box body 20, multiple battery cell modules 10 as described in the aforementioned technical solution, and a connecting piece 30. The box body 20 has a connected accommodating chamber 20a and a pressure relief chamber 20b. The box body 20 is provided with a second pressure relief valve 201, and the second pressure relief valve 201 can connect the pressure relief chamber 20b to the external space of the box body 20. Multiple battery cell modules 10 are arranged in the accommodating chamber 20a along the first direction S1. The connecting piece 30 is provided with a first connecting groove 301 that passes through the first direction S1. The spacing spaces 2a between any two adjacent battery cell modules 10 are sealed with a connecting piece 30, and the first connecting groove 301 of at least one connecting piece 30 is connected to the pressure relief chamber 20b.

[0087] By using the aforementioned battery cell module 10 , it is possible to achieve directional pressure relief of the battery cells 23 while enabling the battery cells 23 included in the battery pack 100 to be stacked in multiple layers, thereby effectively improving the energy density of the battery pack 100 .

[0088] When the battery cell module 10 further includes a pressure relief plate 1, a second bracket 21 and a connecting pipe 25, the first connecting groove 301 is connected to the adjacent pressure relief openings 12 and the connecting pipe 25 of the two battery cell modules 10, so that the partition spaces 2a and the pressure relief grooves 11 of the battery cell modules 10 can be connected through the connecting pipe 25 and the connecting piece 30, and all the partition spaces 2a and the pressure relief grooves 11 are connected to the pressure relief chamber 20b.

[0089] The battery pack 100 also includes a seal 40, which is provided with a second connecting groove 401. For the two pressure relief plates 1 and the two second brackets 21 located at the end portion along the first direction S1, the seal 40 is sealed and connected to the pressure relief plates 1 and the second brackets 21 so that the second connecting groove 401 is connected to the pressure relief opening 12 and the connecting pipe 25, and the second connecting groove 401 is not connected to the external space.

[0090] Please refer to Figure 10. Optionally, the first connecting groove 301 includes two first sub-grooves 301a respectively arranged on two opposite sides of the connecting piece 30 along the first direction S1, and a second sub-groove 301b connected between the two first sub-grooves 301a. The first sub-groove 301a passes through the side surface of the connecting piece 30 close to the pressure relief plate 1 along the second direction S2, and the first sub-groove 301a is connected to the pressure relief opening 12 and the connecting pipe 25 of the adjacent battery cell module 10, so that it can be connected to the pressure relief opening 12 from the side surface of the connecting piece 30 close to the pressure relief plate 1 along the second direction S2 through the first sub-groove 301a, and can be connected to the connecting pipe 25 from the surface of the connecting piece 30 along the first direction S1 through the first sub-groove 301a.

[0091] Optionally, the second sub-groove 301b may not penetrate the surface of the connecting piece 30 along the second direction S2, so that the second sub-groove 301b does not affect the sealing of the surface of the connecting piece 30 along the second direction S2, so that the connecting piece 30 can seal the gap between the two adjacent pressure relief plates 1 through the side surface close to the pressure relief plate 1 along the second direction S2, so as to achieve connection with the pressure relief opening 12 and the connecting pipe 25 through the second connecting groove 401, and the second connecting groove 401 is not connected to the external space.

[0092] The aforementioned "first connecting groove 301 of at least one connecting member 30 is connected to the pressure relief chamber 20b" includes the following two different situations. In the first situation, the battery pack 100 includes only two battery cell modules 10. In this case, the battery pack 100 includes only one connecting member 30, which is connected to the pressure relief chamber 20b. In the second situation, the battery pack 100 includes three or more battery cell modules 10. In this case, the battery pack 100 includes multiple connecting members 30, and among the multiple connecting members 30, at least one connecting member 30 has its first connecting groove 301 connected to the pressure relief chamber 20b.

[0093] For example, the connecting piece 30 can connect the first connecting groove 301 to the pressure relief chamber 20b through an external connecting pipe, connecting channel or other connecting structure, or the connecting piece 30 can directly connect to the box body 20 and connect the first connecting groove 301 to the pressure relief chamber 20b.

[0094] Please refer to Figure 11. Optionally, the accommodating chamber 20a is connected to the pressure relief chamber 20b through a connecting hole 20c. The battery pack 100 includes a connecting piece 30 that extends along the second direction S2 to be sealed and inserted into the connecting hole 20c. The connecting piece 30 is inserted into one end of the connecting hole 20c and is provided with a third connecting groove 302 connected to the first connecting groove 301. On the one hand, the first connecting groove 301 of the connecting piece 30 can be connected to the pressure relief chamber 20b through the third connecting groove 302. On the other hand, the connecting piece 30 can be limited by the connecting hole 20c, so that the connection relationship between the third connecting groove 302 and the pressure relief chamber 20b is easy to maintain stability.

[0095] Optionally, for any two adjacent battery cell modules 10, among the two battery cells 23 that are opposite to each other across the pressure relief plate 1, only the first pressure relief valve 231 of one battery cell 23 is facing the other battery cell 23, thereby reducing the impact of the high-temperature and high-pressure gas generated by the pressure relief of the battery cell 23 on the battery cell 23 of the adjacent battery cell module 10, and reducing the possibility of the pressure relief of the battery cell 23 inducing thermal runaway of the battery cell 23 that is opposite to each other across the pressure relief plate 1.

[0096] In the description herein, the terms "upper," "lower," "left," "right," and other positions or relationships are based on the positions or 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.

[0097] Throughout this specification, references to terms such as "an embodiment" or "example" mean that the features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0098] In addition, although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in multiple embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A battery cell module, comprising: Two battery cell components, the two battery cell components are arranged at intervals along a first direction and form an interval space. The battery cell component includes a first bracket, a plurality of battery cells and an electrical connection structure. A plurality of first setting grooves penetrating along the first direction are arranged in an array on the first bracket, the first setting grooves communicate with the interval space, end portions of the plurality of battery cells are respectively inserted into the first setting grooves, the electrical connection structure installed on the first bracket electrically connects the plurality of battery cells to each other, and at least part of the first pressure relief valves of the battery cells can communicate with the interval space through the first setting grooves; and, A sealing structure, the sealing structure surrounds and is sealingly connected to the edges of the two first brackets to seal the interval space.

2. The battery cell module according to claim 1, wherein, The battery cell module further includes two pressure relief plates, the two pressure relief plates are respectively arranged on two opposite sides of the two battery cell components as a whole along the first direction, a pressure relief groove is arranged on a side of the pressure relief plate facing the battery cell component, and a pressure relief opening communicating with the pressure relief groove is formed on one side of the pressure relief plate along a second direction; The battery cell component further includes a second bracket, the second bracket is arranged between the battery cell and the pressure relief plate, a plurality of second setting grooves penetrating along the first direction are arranged in an array on the second bracket, the second bracket is sealingly connected to the pressure relief plate, and the second setting grooves communicate with the pressure relief groove. End portions of the plurality of battery cells far from the first bracket are respectively inserted into the second setting grooves, and at least part of the first pressure relief valves of the battery cells can communicate with the pressure relief groove through the second setting grooves; Wherein, the first direction is perpendicular to the second direction.

3. The battery cell module according to claim 2, wherein, The battery cell component further includes a communication pipe, the communication pipe is connected between the first bracket and the second bracket, one end of the communication pipe communicates with the interval space, and the other end of the communication pipe is located on a side towards which the pressure relief opening faces.

4. The battery cell module according to claim 3, wherein, A first convex portion protruding towards the outer periphery along the second direction is provided on a side edge of the second bracket close to the pressure relief opening, a first connection hole penetrating along the first direction is provided on the first convex portion, a second convex portion protruding towards the outer periphery along the second direction is provided on a side edge of the first bracket close to the pressure relief opening, a second connection hole penetrating along the first direction is provided on the second convex portion, and two ends of the communication pipe are respectively sealingly inserted into the first connection hole and the second connection hole.

5. The battery cell module according to claim 4, wherein, A limiting groove is further formed on a side of the pressure relief plate provided with the pressure relief opening, the limiting groove is located on a side of the pressure relief opening close to the battery cell component, and the first convex portion is inserted into the limiting groove and is sealingly connected to the groove wall of the limiting groove.

6. The battery cell module according to any one of claims 2 to 5, wherein, The battery cell module further includes two fixed end plates, the two fixed end plates are respectively arranged on two opposite sides of the outer periphery of the battery cell component, and two ends of the fixed end plate are respectively connected to the two pressure relief plates.

7. The battery cell module according to claim 6, wherein, The battery cell module includes at least one of the following: The fixed end plate is provided with a connection portion, the connection portion is provided with a third connection hole, and the third connection hole is arranged for an external fastener to pass through to connect the connection portion to an external fixed structure; or, The battery cell module further includes an input / output structure, which is electrically connected to the electrical connection structures of the two battery cell assemblies, and the input / output structure is disposed on the fixed end plate.

8. The battery cell module according to any one of claims 1 to 5, wherein, The battery cell assembly further includes at least one of the following: A foaming glue structure, which integrally connects the battery cell and the first bracket, and the foaming glue fills the gaps between the plurality of battery cells and the first bracket; or, A mica sheet, which is stacked on the side of the first bracket away from the battery cell.

9. The battery cell module according to any one of claims 1 to 5, wherein, Among the two opposite ends of the battery cell, only one end is provided with the first pressure relief valve. The battery cell module includes at least one of the following: Along one of the arrangement directions of the plurality of battery cell arrays, the first pressure relief valves of any two adjacent battery cells face in opposite directions; or, the plurality of battery cells included in the two battery cell assemblies are spaced apart from each other on both sides of the spaced space, and among the two spaced-apart battery cells, only the first pressure relief valve of one battery cell faces the spaced space.

10. A battery pack, comprising: A box body, which has a communicating accommodation cavity and a pressure relief cavity, and a second pressure relief valve is provided on the box body, and the second pressure relief valve can communicate the pressure relief cavity with the external space of the box body; A plurality of battery cell modules as described in any one of claims 1 to 9, and the plurality of battery cell modules are arranged in the accommodation cavity along a first direction; and, A connecting member, which is provided with a first connecting groove penetrating along the first direction, and the connecting member is hermetically connected between the spaced spaces of any two adjacent battery cell modules, and the first connecting groove of at least one connecting member communicates with the pressure relief cavity.

11. The battery pack according to claim 10, wherein, When the battery cell module further includes a pressure relief plate, a second bracket, and a connecting pipe, the first connecting groove communicates with the adjacent pressure relief openings and the connecting pipe of the two battery cell modules, and the battery pack further includes a sealing member, which is provided with a second connecting groove. For the two pressure relief plates and the two second brackets located at the two outermost ends along the first direction, the sealing member is hermetically connected to the pressure relief plate and the second bracket, so that the second connecting groove communicates with the pressure relief opening and the connecting pipe, and the second connecting groove does not communicate with the external space.

12. The battery pack according to claim 11, wherein, The battery pack includes at least one of the following: The first connecting groove includes two first sub-grooves respectively provided on the two opposite sides of the connecting member along the first direction, and a second sub-groove communicating between the two first sub-grooves. The first sub-groove penetrates through the surface of the connecting member along the second direction close to the pressure relief plate, and the first sub-groove communicates with the pressure relief opening and the connecting pipe of the adjacent battery cell module; or, The accommodation cavity and the pressure relief cavity are connected through a communication hole, and one connecting member included in the battery pack extends along the second direction and is hermetically inserted into the communication hole, and a third connecting groove communicating with the first connecting groove is opened at one end of the connecting member inserted into the communication hole.

13. The battery pack according to claim 11 or 12, wherein, For any two adjacent battery cell modules, among the two battery cells that are spaced opposite each other across the pressure relief plate, only the first pressure relief valve of one of the battery cells faces the other battery cell.

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