Battery cell module and battery pack

Abstract

The utility model discloses a battery cell module and battery pack, the battery cell module comprises two battery cell components and a sealing structure, the two battery cell components are arranged at an interval along a first direction and form an interval space, each battery cell component comprises a first support, a plurality of battery cells and an electric connection structure, a plurality of first arrangement grooves penetrating in the first direction are formed in the first support in an array mode, the first arrangement grooves communicate with the interval spaces, the ends of the battery cells are inserted into the first arrangement grooves correspondingly, and the multiple battery cells are electrically connected through an electric connection structure installed on the first support; the first pressure relief valves of at least part of the battery cells can be communicated with the interval space through the first arrangement grooves, the sealing structure surrounds and is connected to the edges of the two first brackets in a sealing manner so as to seal the interval space, and the battery cell module can realize directional pressure relief on the stacked battery cells.

Description

Technical Field

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

[0002] In order to achieve the directional pressure relief of battery cells, in related technologies, a method of arranging pressure relief channels corresponding to each battery cell in the box body of the battery pack is often adopted. However, in this way, on the one hand, when installing multiple battery cells on the box body, it is necessary to align each battery cell with the pressure relief channel on the box body, and the installation difficulty of the battery cells is relatively high. On the other hand, it is necessary to ensure that the pressure relief valves of all battery cells are arranged adjacent to the pressure relief channel of the box body, and it is difficult to realize the multi-layer stacking arrangement of battery cells, thereby making it difficult to improve the energy density of the battery pack. Summary of the Utility Model

[0003] An object of the utility model is to provide a battery cell module capable of achieving directional pressure relief for stacked battery cells.

[0004] Another object of the utility model is to provide a battery pack. By using the aforementioned battery cell module, while achieving the directional pressure relief of battery cells, the battery cells included in the battery pack can be arranged in multiple layers, thereby effectively improving the energy density of the battery pack.

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

[0006] In a first aspect, a battery cell module is provided, including:

[0007] Two battery cell assemblies, the two battery cell assemblies are arranged at intervals along a first direction and form an interval space. The battery cell assembly 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. The end parts of each battery cell 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,

[0008] A sealing structure, the sealing structure surrounds and is hermetically connected to the edges of the two first brackets to seal the interval space.

[0009] As a preferred 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 arranged on the side of the pressure relief plate facing the battery cell assembly. A pressure relief opening communicating with the pressure relief groove is arranged on one side of the pressure relief plate along a second direction;

[0010] The battery cell assembly further includes a second bracket, which is disposed 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 hermetically connected to the pressure relief plate, and the second setting grooves communicate with the pressure relief grooves. The end portions of the battery cells away from the first bracket are respectively inserted into the second setting grooves, and the first pressure relief valves of some of the battery cells can communicate with the pressure relief grooves through the second setting grooves;

[0011] Wherein, the first direction is perpendicular to the second direction.

[0012] As a preferred technical solution of the battery cell module, the battery cell assembly further includes a connecting pipe, the connecting pipe is connected to the first bracket and the second bracket, one end of the connecting pipe communicates with the interval space, and the other end of the connecting pipe is located on the side facing the pressure relief opening.

[0013] As a preferred technical solution of the battery cell module, a first convex portion protruding outward along the second direction is provided on one side edge of the second bracket close to the pressure relief opening. A first connecting hole penetrating along the first direction is provided on the first convex portion. A second convex portion protruding outward along the second direction is provided on one side edge of the first bracket close to the pressure relief opening. A second connecting hole penetrating along the first direction is provided on the second convex portion. Two ends of the connecting pipe are respectively hermetically inserted into the first connecting hole and the second connecting hole.

[0014] As a preferred technical solution of the battery cell module, a limiting groove is further opened on the side of the pressure relief plate where the pressure relief opening is provided. The limiting groove is located on the side of the pressure relief opening close to the battery cell assembly. The first convex portion is inserted into the limiting groove and hermetically connected to the groove wall of the limiting groove.

[0015] As a preferred technical solution of the battery cell module, the battery cell module further includes two fixed end plates, the two fixed end plates are respectively disposed on two opposite sides of the outer periphery of the battery cell assembly, and two ends of the fixed end plate are respectively connected to the two pressure relief plates.

[0016] As a preferred technical solution of the battery cell 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 used for an external fastener to pass through to connect the connecting portion to an external fixed structure; and / or,

[0017] The battery cell module further includes an input / output structure, the input / output structure 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.

[0018] As a preferred technical solution of the battery cell module described above, the battery cell assembly further includes a foaming glue structure, which connects the battery cells, the second bracket, and the first bracket into one body, and the foaming glue fills the gaps between the battery cells, the second bracket, and the first bracket; and / or,

[0019] The battery cell assembly further includes mica sheets, which are stacked on one side of the first bracket away from the second bracket.

[0020] As a preferred technical solution of the battery cell module described above, among the two opposite ends of the battery cell, only one end is provided with the first pressure relief valve;

[0021] Along one of the arrangement directions of the multiple battery cell arrays, the first pressure relief valves of any two adjacent battery cells face in opposite directions; and / or, among the multiple battery cells respectively included in the two battery cell assemblies, the battery cells are spaced apart from each other on both sides of the interval space, and among the two spaced-apart battery cells, only the first pressure relief valve of one battery cell faces the interval space.

[0022] In a second aspect, a battery pack is provided, including:

[0023] A box body, the box body 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;

[0024] Multiple battery cell modules as described in the first aspect above, and the multiple battery cell modules are arranged in the accommodation cavity along the first direction; and,

[0025] A connecting member, the connecting member is provided with a first connecting groove penetrating along the first direction, and the connecting member is hermetically connected between the interval 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.

[0026] As a preferred technical solution of the battery pack described above, 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, the sealing member is provided with a second connecting groove, and for the two pressure relief plates and the two second brackets located at the 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 is not communicated with the external space.

[0027] As a preferred technical solution of the battery pack, the first communication groove includes two first sub-grooves respectively arranged on two opposite sides of the communication member along the first direction, and a second sub-groove communicating between the two first sub-grooves. The first sub-groove penetrates through one surface of the communication member along the second direction close to the pressure relief plate, and the first sub-groove communicates with the pressure relief opening and the communication pipe of the adjacent battery cell module; and / or,

[0028] The accommodation cavity is communicated with the pressure relief cavity through a communication hole. One communication member included in the battery pack extends along the second direction and is hermetically inserted into the communication hole. A third communication groove communicating with the first communication groove is formed at one end of the communication member inserted into the communication hole.

[0029] As a preferred technical solution of the battery pack, for any two adjacent battery cell modules, among the two battery cells spaced relatively across the pressure relief plate, only the first pressure relief valve of one battery cell faces the other battery cell.

[0030] The beneficial effects of the present utility model are as follows:

[0031] By providing the first bracket, stacking two battery cell assemblies with a space therebetween, and enabling at least part of the first pressure relief valves of the battery cells to communicate with the space through the first setting groove, at least part of the battery cells can perform directional pressure relief into the space. Description of the Drawings

[0032] The following further describes the present utility model in detail according to the drawings and embodiments.

[0033] Figure 1 It is a three-dimensional structural schematic diagram of the battery cell module described in the embodiment.

[0034] Figure 2 It is a three-dimensional sectional schematic diagram of the battery cell module described in the embodiment.

[0035] Figure 3 It is an exploded structural schematic diagram of the battery cell module described in the embodiment.

[0036] Figure 4 It is an exploded structural schematic diagram of the electrical connection structure, the second bracket, the first bracket, the battery cell, and the foaming glue structure described in the embodiment.

[0037] Figure 5 It is a three-dimensional structural schematic diagram of the pressure relief plate described in the embodiment.

[0038] Figure 6 It is a three-dimensional structural schematic diagram of the battery pack described in the embodiment.

[0039] Figure 7It is a schematic diagram of the structural decomposition of the battery pack described in the embodiment.

[0040] Figure 8 It is Figure 6 the sectional view taken along the line A-A in

[0041] Figure 9 It is Figure 8 the enlarged schematic view at position M in

[0042] Figure 10 It is a schematic perspective view of a kind of connecting piece described in the embodiment.

[0043] Figure 11 It is a schematic perspective view of another kind of connecting piece described in the embodiment.

[0044] In the figure:

[0045] 100, battery pack;

[0046] 10, battery cell module; 1, pressure relief plate; 11, pressure relief groove; 12, pressure relief opening; 13, limiting groove; 2, battery cell assembly; 2a, spacer space; 21, second bracket; 211, second setting groove; 212, first protrusion; 212a, first connection hole; 22, first bracket; 221, first setting groove; 222, second protrusion; 222a, second connection hole; 23, battery cell; 231, first pressure relief valve; 24, electrical connection structure; 25, communication pipe; 3, sealing structure; 4, foaming glue structure; 5, mica sheet; 6, fixed end plate; 7, input / output structure; 71, structure fixing seat; 72, aluminum bar;

[0047] 20, box body; 20a, accommodation cavity; 20b, pressure relief cavity; 20c, communication hole; 201, second pressure relief valve;

[0048] 30, connecting piece; 301, first communication groove; 301a, first sub-groove; 301b, second sub-groove; 302, third communication groove;

[0049] 40, sealing member; 401, second communication groove. Detailed implementation manners

[0050] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

[0051] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. 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 circumstances.

[0052] 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 between them. 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 first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0053] As Figures 1 to 4 shown, the present utility model 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 and 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. A plurality of first setting grooves 221 penetrating along the first direction S1 are arranged in an array on the first bracket 22. The first setting grooves 221 communicate with the interval space 2a. The end portions of the respective 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 communicate with the interval space 2a through the first setting grooves 221. The sealing structure 3 surrounds and is sealingly connected to the edges of the two first brackets 22 to seal the interval space 2a.

[0054] By providing the first bracket 22, stacking the two battery cell assemblies 2 with an interval to form the interval space 2a, and enabling the first pressure relief valves 231 of at least some of the battery cells 23 to communicate with the interval space 2a through the first setting grooves 221, at least some of the battery cells 23 can perform directional pressure relief into the interval space 2a.

[0055] Optionally, the battery cell module 10 further includes two pressure relief plates 1, which are respectively disposed on two opposite sides of the two battery cell assemblies 2 along the first direction S1. A pressure relief groove 11 is provided on the side of the pressure relief plate 1 facing the battery cell assembly 2. A pressure relief opening 12 communicating with the pressure relief groove 11 is provided 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 disposed between the battery cell 23 and the pressure relief plate 1. A plurality of second setting grooves 211 penetrating along the first direction S1 are arranged in an array on the second bracket 21. The second bracket 21 is hermetically connected to the pressure relief plate 1, and the second setting grooves 211 communicate with the pressure relief groove 11. The end portions of each battery cell 23 away from the first setting groove 221 are respectively inserted into the second setting grooves 211, and the first pressure relief valves 231 of some battery cells 23 can communicate with the pressure relief groove 11 through the second setting grooves 211. Wherein, the first direction S1 is perpendicular to the second direction S2.

[0056] By providing the pressure relief plate 1 and the first bracket 22, the battery cells 23 included in the battery cell assembly 2 can relieve pressure to the spaced 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 directionally relieved to the outside of the battery cell module 10 through the pressure relief opening 12. Thus, the battery cell module 10 can realize directional pressure relief of the stacked battery cells 23 towards the external space.

[0057] In addition, the pressure relief plate 1 can also block the high-temperature and high-pressure gas in the battery cell module 10 from directly spraying onto adjacent other structures, thereby reducing heat diffusion and reducing the impact on other external structures after thermal runaway of the battery cells 23 in the battery cell module 10.

[0058] Optionally, the battery cell assembly 2 further includes a connecting pipe 25, which is connected to the first bracket 22 and the second bracket 21, and one end of the connecting pipe 25 communicates with the spaced space 2a, and the other end of the connecting pipe 25 is located on the side facing the pressure relief opening 12, so that the spaced space 2a can communicate with the external space through the connecting pipe 25, so that the gas discharged into the spaced space 2a can be directionally relieved to the outside of the battery cell module 10 through the connecting pipe 25.

[0059] Optionally, there can be multiple connecting pipes 25 communicating with the spaced space 2a on the same side along the first direction S1 from the spaced space 2a, so as to improve the pressure relief flow rate of the spaced space 2a to the external space by increasing the number of connecting pipes 25, and further improve the pressure relief efficiency of the spaced space 2a to the external space.

[0060] Optionally, the sealing structure 3 may include a sealing rubber strip, and the spaced space 2a and the external space of the battery cell module 10 are sealed by pasting the sealing rubber strip around the two first brackets 22.

[0061] Optionally, on one side edge of the second bracket 21 close to the pressure relief opening 12, there is a first protruding portion 212 protruding outward along the second direction S2. There is a first connection hole 212a penetrating along the first direction S1 on the first protruding portion 212. On one side edge of the first bracket 22 close to the pressure relief opening 12, there is a second protruding portion 222 protruding outward along the second direction S2. There is a second connection hole 222a penetrating along the first direction S1 on the second protruding portion 222. Both ends of the connecting pipe 25 are hermetically inserted into the first connection hole 212a and the second connection hole 222a respectively, so as to avoid the connecting pipe 25 occupying the installation space between the second bracket 21 and the first bracket 22, enabling more battery cells 23 to be arranged between the second bracket 21 and the first bracket 22.

[0062] Please refer to Figure 5 As shown, optionally, on the side of the pressure relief plate 1 provided with the pressure relief opening 12, a limiting groove 13 is further opened. The limiting groove 13 is located on the side of the pressure relief opening 12 close to the battery cell assembly 2. The first protruding portion 212 is inserted into the limiting groove 13 and hermetically connected to the groove wall of the limiting groove 13, so as to limit the first protruding portion 212 through the limiting groove 13 and improve the assembly accuracy between the second bracket 21 and the pressure relief plate 1.

[0063] Optionally, the limiting groove 13 can be communicated with the pressure relief opening 12, so that the limiting groove 13 and the pressure relief opening 12 can make more efficient use of the limited installation space on the side surface of the pressure relief plate 1 along the second direction S2.

[0064] Preferably, 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 stepped surface is formed at the connection between the limiting groove 13 and the pressure relief opening 12. This stepped surface can abut against and hermetically connect to the first protruding portion 212 to prevent the first protruding portion 212 from entering the pressure relief opening 12, and further prevent the first protruding portion 212 from affecting the pressure relief function of the pressure relief opening 12, where the third direction S3 is perpendicular to the first direction S1 and the second direction S2.

[0065] Please refer to again Figures 2 to 4, Optionally, the battery cell assembly 2 further includes a foaming adhesive structure 4. The foaming adhesive structure 4 connects the battery cells 23, the second bracket 21, and the first bracket 22 into an integrated body, and the foaming adhesive fills the gaps between the battery cells 23, the second bracket 21, and the first bracket 22. Thus, on the one hand, the battery cells 23, the second bracket 21, and the first bracket 22 can be fixed by the foaming adhesive structure 4, facilitating the disassembly and assembly of the battery cells 23, the second bracket 21, and the first bracket 22 as a whole. On the other hand, the gaps between the battery cells 23 and the second bracket 21 and the first bracket 22 can be sealed by the foaming adhesive, preventing gas from leaking from the gaps between the battery cells 23 and the second bracket 21 and the first bracket 22 to adjacent battery cells 23 when the battery cells 23 release pressure, which may cause thermal runaway of adjacent battery cells 23. Additionally, on the other hand, the good heat insulation and flame retardant properties of the foaming adhesive can be utilized to reduce the heat and flame from the battery cell 23 where thermal runaway occurs from affecting the surrounding battery cells 23, further avoiding the occurrence of cascading thermal runaway of multiple battery cells 23.

[0066] Optionally, the battery cell assembly 2 further includes a mica sheet 5. The mica sheet 5 is stacked on the side of the first bracket 22 away from the second bracket 21. Thus, by utilizing the good heat resistance, flame retardant, and insulation properties of the mica sheet 5, on the one hand, when the battery cell 23 releases pressure towards the spaced-apart space 2a, the high-temperature gas released can be blocked to a certain extent, reducing the impact of the high-temperature gas on the battery cells 23 of adjacent battery cell assemblies 2. On the other hand, it can prevent the battery cells 23 of two adjacent battery cell assemblies 2 from being electrically connected.

[0067] Preferably, a plurality of through holes penetrating along the first direction S1 can be formed in the mica sheet 5, enabling the mica sheet 5 to play a certain flame retardant role while ensuring the pressure relief efficiency of the battery cell 23 releasing pressure towards the spaced-apart space 2a through the through holes.

[0068] Optionally, among the two opposite ends of the battery cell 23, only one end is provided with a first pressure relief valve 231. Thus, one battery cell 23 can only release pressure to one of the spaced-apart space 2a and the pressure relief groove 11, enhancing the certainty of the pressure relief direction of the battery cell 23.

[0069] Optionally, along one of the arrangement directions of the plurality of battery cells 23 arranged in an array, the first pressure relief valves 231 of any two adjacent battery cells 23 face in opposite directions. Thus, the pressure relief directions of two adjacent battery cells 23 along one of the arrangement directions of the plurality of battery cells 23 arranged in an array are opposite, and further, when the plurality of battery cells 23 of the battery cell assembly 2 release pressure simultaneously, the pressure relief positions are relatively dispersed, reducing the impact of the high-temperature and high-pressure gas generated by the pressure relief on the adjacent battery cells 23.

[0070] Exemplarily, a plurality of battery cells 23 may be arranged in an array along a third direction S3 and a fourth direction S4 respectively. Thus, along the third direction S3, the first pressure relief valves 231 of any two adjacent battery cells 23 may face in opposite directions, or along the fourth direction S4, the first pressure relief valves 231 of any two adjacent battery cells 23 may face in opposite directions. Wherein, the third direction S3 and the fourth direction S4 form an angle, 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.

[0071] In addition, usually, a positive electrode and a negative electrode are respectively provided at two opposite ends of the battery cell 23, and the first pressure relief valve 231 is usually provided at the same end as only one of the positive electrode and the negative electrode. In other words, the first pressure relief valves 231 of all the battery cells 23 may be provided at the same end as the positive electrode, or the first pressure relief valves 231 of all the battery cells 23 may be provided at the same end as the negative electrode. Thus, such an arrangement can also make the positive and negative electrode directions of any two adjacent battery cells 23 opposite along one of the arrangement directions of the plurality of battery cells 23 arranged in an array, which is convenient for the electrical connection structure 24 to electrically connect two adjacent battery cells 23 from the same side of the plurality of battery cells 23 along the first direction S1.

[0072] Optionally, the plurality of battery cells 23 included in the two battery cell assemblies 2 are spaced opposite to each other on both sides of the spacing 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 faces the spacing space 2a, so as to avoid the high-temperature and high-pressure gas discharged when the battery cell 23 discharges pressure towards the spacing space 2a from directly heating the first pressure relief valve 231 of the battery cell 23 spaced opposite to it, and inducing the battery cell 23 spaced opposite to it to also have a thermal runaway.

[0073] Optionally, while the first pressure relief valves 231 of any two adjacent battery cells 23 face in opposite directions along one of the arrangement directions of the plurality of battery cells 23 arranged in an array, only the first pressure relief valve 231 of one battery cell 23 faces the spacing space 2a among the two battery cells 23 spaced opposite to each other across the spacing space 2a, so that the performance of the battery cell module 10 in preventing thermal diffusion and thermal runaway chain reaction is better.

[0074] Optionally, the battery cell module 10 further includes two fixing end plates 6. The two fixing end plates 6 are respectively provided on two opposite sides of the outer periphery of the battery cell assembly 2, and both ends of the fixing end plate 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 fixing end plate 6, making the overall structural stability of the battery cell module 10 better, not easily occurring the situation of component detachment, and being more convenient for disassembling and assembling the whole battery cell module 10 to other structures. For example, it is convenient to disassemble and assemble the whole battery cell module 10 to the battery pack 100.

[0075] Optionally, the fixed end plate 6 is provided with a connecting portion, and the connecting portion is provided with a third connecting hole for an external fastener to pass through to connect the connecting portion to an external fixing structure, so as to integrally fasten and connect the battery cell module 10 to the external fixing structure through the external fastener.

[0076] Optionally, the electrical connection structure 24 may include a CCS (Cells Contact System, integrated busbar), and wire connection structures may be provided on both the second bracket 21 and the first bracket 22 to electrically connect the battery cells 23 included in the battery cell assembly 2 through the CCS.

[0077] Optionally, the battery cell module 10 further includes an input / output structure 7, and the input / output structure 7 is electrically connected to the electrical connection structures 24 of the two battery cell assemblies 2, that is, all the battery cells 23 included in the battery cell module 10 can be integrally connected to an external circuit through the input / output structure 7.

[0078] Optionally, the input / output structure 7 is provided on the fixed end plate 6. On the one hand, the relative position between the input / output structure 7 and the two battery cell assemblies 2 can be stabilized, which is beneficial to maintaining the stability of the electrical connection relationship between the input / output structure 7 and the electrical connection structures 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 entire battery cell module 10. Thus, when an operator disassembles and assembles the battery cell module 10 to / from an external structure, the battery cell module 10 can be fixed to or disassembled from the external fixing structure through the fixed end plate 6 from the same side, and the battery cell module 10 can be electrically connected to or disconnected from the external circuit through the input / output structure, which can simplify the disassembly and assembly operations of the operator.

[0079] Please refer to Figure 1 As shown, exemplarily, the two battery cell assemblies 2 may be connected in series, and the input / output structure 7 may include a structure fixing seat 71 and two aluminum busbars 72. The structure fixing seat 71 is provided on the fixed end plate 6, the two aluminum busbars 72 are both provided on the structure fixing seat 71, and the two aluminum busbars 72 are respectively electrically connected to the electrical connection structures 24 of the two battery cell assemblies 2, so that the two aluminum busbars 72 can be fixed to the fixed end plate 6 through the structure fixing seat 71, and the two aluminum busbars 72 form the input and output aluminum busbars of the two battery cell assemblies 2 as a whole.

[0080] As Figures 6 to 9As shown in the figure, the present utility model further provides a battery pack 100, which includes a box body 20, a plurality of cell modules 10 as described in the foregoing technical solution, and a connecting member 30. The box body 20 has a communicating accommodation cavity 20a and a pressure relief cavity 20b. A second pressure relief valve 201 is provided on the box body 20, and the second pressure relief valve 201 can connect the pressure relief cavity 20b to the external space of the box body 20. A plurality of cell modules 10 are arranged in the accommodation cavity 20a along the first direction S1. The connecting member 30 is provided with a first connecting groove 301 that penetrates along the first direction S1. A connecting member 30 is hermetically connected between the spaced spaces 2a of any two adjacent cell modules 10, and the first connecting groove 301 of at least one connecting member 30 communicates with the pressure relief cavity 20b.

[0081] By using the foregoing cell module 10, while achieving the directional pressure relief of the cell 23, the cells 23 included in the battery pack 100 can be stacked in multiple layers, thereby effectively improving the energy density of the battery pack 100.

[0082] When the cell module 10 further includes a pressure relief plate 1, a second bracket 21, and a connecting pipe 25, the first connecting groove 301 communicates with the adjacent pressure relief openings 12 and the connecting pipe 25 of the two cell modules 10. Thus, the spaced spaces 2a and the pressure relief grooves 11 of each cell module 10 can be connected through the connecting pipe 25 and the connecting member 30, and all the spaced spaces 2a and the pressure relief grooves 11 communicate with the pressure relief cavity 20b.

[0083] Further, the battery pack 100 further includes a sealing member 40. The sealing member 40 is provided with a second connecting groove 401. For the two pressure relief plates 1 and the two second brackets 21 located at the outermost ends along the first direction S1, the sealing member 40 is hermetically connected to the pressure relief plate 1 and the second bracket 21, so that the second connecting groove 401 communicates with the pressure relief opening 12 and the connecting pipe 25, and the second connecting groove 401 does not communicate with the external space.

[0084] Please refer to Figure 10 As shown in the figure, optionally, the first connecting groove 301 includes two first sub-grooves 301a respectively provided on two opposite sides of the connecting member 30 along the first direction S1, and a second sub-groove 301b communicating between the two first sub-grooves 301a. The first sub-groove 301a penetrates through the surface of the connecting member 30 on the side close to the pressure relief plate 1 along the second direction S2, and the first sub-groove 301a communicates with the pressure relief opening 12 and the connecting pipe 25 of the adjacent cell module 10. Thus, the pressure relief opening 12 can be communicated through the first sub-groove 301a from the surface of the connecting member 30 on the side close to the pressure relief plate 1 along the second direction S2, and the connecting pipe 25 can be communicated through the first sub-groove 301a from the surface of the connecting member 30 along the first direction S1.

[0085] Preferably, the second sub-groove 301b may not penetrate through the surface of the connecting member 30 along the second direction S2, so that the second sub-groove 301b does not affect the sealing performance of the surface of the connecting member 30 along the second direction S2, enabling the connecting member 30 to seal the gap between two adjacent pressure relief plates 1 through the surface on the side close to the pressure relief plate 1 along the second direction S2, so as to realize the connection to the pressure relief opening 12 and the connecting pipe 25 through the second communication groove 401, and the second communication groove 401 is not connected to the external space.

[0086] It should be noted that the statement "the first communication groove 301 of at least one connecting member 30 communicates with the pressure relief chamber 20b" mentioned above includes the following two different situations. In the first situation, the battery pack 100 only includes two battery cell modules 10. At this time, the battery pack 100 only includes one connecting member 30, and this one connecting member 30 communicates with the pressure relief chamber 20b. In the second situation, the battery pack 100 includes three or more battery cell modules 10. At this time, the battery pack 100 includes multiple connecting members 30. Among the multiple connecting members 30, the first communication groove 301 of at least one connecting member 30 communicates with the pressure relief chamber 20b.

[0087] Specifically, the connecting member 30 can be connected to the pressure relief chamber 20b through external connecting structures such as connecting pipes and connecting channels, or the connecting member 30 can be directly connected to the box body 20 and the first communication groove 301 can be connected to the pressure relief chamber 20b.

[0088] Please refer to Figure 11 As shown, optionally, the accommodation chamber 20a and the pressure relief chamber 20b are connected through a communication hole 20c. One connecting member 30 included in the battery pack 100 extends along the second direction S2 and is hermetically inserted into the communication hole 20c. A third communication groove 302a communicating with the first communication groove 301 is provided at one end of the connecting member 30 inserted into the communication hole 20c. Thus, on the one hand, the first communication groove 301 of the connecting member 30 can communicate with the pressure relief chamber 20b through the third communication groove 302a, and on the other hand, the connecting member can be limited through the communication hole 20c, making it easy to maintain the stable communication relationship between the third communication groove 302a and the pressure relief chamber 20b.

[0089] Optionally, for any two adjacent battery cell modules 10, among the two battery cells 23 that are spaced apart and opposite to each other across the pressure relief plate 1, only the first pressure relief valve 231 of one battery cell 23 faces the other battery cell 23, so as to reduce the impact of the high-temperature and high-pressure gas generated by the pressure relief of the battery cell 23 on the battery cells 23 of the adjacent battery cell module 10, and reduce the possibility of the situation where the pressure relief of the battery cell 23 induces the thermal runaway of the battery cells 23 that are spaced apart and opposite to each other across the pressure relief plate 1.

[0090] In the description of this article, it should be understood that the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying operations, 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 therefore 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.

[0091] In the description of this specification, the description referring to terms such as "one embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0092] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0093] The technical principles of the present utility model have been described above in combination with specific embodiments. These descriptions are only for explaining the principles of the present utility model and cannot be construed as a limitation to the protection scope of the present utility model in any way. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the present utility model without creative efforts, and these ways will fall within the protection scope of the present utility model.

Claims

1. A battery cell module, characterized in that: include: Two battery cell assemblies, the two battery cell assemblies are arranged in a first direction and form a spacing 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 penetrating along the first direction, the first setting grooves are connected to the spacing space, the ends of each battery cell are respectively inserted in 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 spacing space through the first setting grooves; and, A sealing structure surrounds and is sealingly connected to edges of the two first brackets to seal the interval space.

2. The battery cell module according to claim 1, characterized in that: The battery module further includes two pressure relief plates, which are respectively arranged on two opposite sides of the two battery assemblies as a whole along the first direction, a pressure relief groove is arranged on one side of the pressure relief plate facing the battery assemblies, 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; The battery cell assembly further includes a second bracket, the second bracket is arranged between the battery cell and the pressure relief plate, a plurality of second arrangement grooves are arranged in an array on the second bracket and extend along the first direction, the second bracket is sealed and connected to the pressure relief plate, and the second arrangement groove is communicated with the pressure relief groove, the ends of each battery cell away from the first bracket are respectively inserted into the second arrangement groove, and the first pressure relief valves of some of the battery cells can be communicated with the pressure relief groove through the second arrangement groove; The first direction is perpendicular to the second direction.

3. The battery cell module according to claim 2, characterized in that: The battery cell assembly further includes a connecting tube connected to the first bracket and the second bracket, one end of the connecting tube is connected to the spacing space, and the other end of the connecting tube is located on the side facing the pressure relief opening.

4. The battery cell module according to claim 3, characterized in that: A first protrusion protruding toward the periphery along the second direction is provided on an edge of one side 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 an edge of one side 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; and both ends of the connecting pipe are sealed and inserted into the first connecting hole and the second connecting hole, respectively.

5. The battery cell module according to claim 4, characterized in that: The pressure relief plate is provided with a limiting groove on one side of the pressure relief opening, the limiting groove is located on the side of the pressure relief opening close to the battery cell assembly, and the first protrusion is inserted into the limiting groove and sealed to the groove wall of the limiting groove.

6. The battery cell module according to any one of claims 2 to 5, characterized in that: The battery cell module further includes two fixed end plates, which are respectively arranged at two opposite sides of the outer periphery of the battery cell assembly, and two ends of the fixed end plates are respectively connected to the two pressure relief plates.

7. The battery cell module according to claim 6, characterized in that: 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 used for an external fastener to pass through so as to connect the connecting portion to an external fixed structure; and / 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 is disposed on the fixed end plate.

8. The battery cell module according to any one of claims 1 to 5, characterized in that: The battery cell assembly further includes a foam structure, wherein the foam structure connects the battery cells and the first bracket as a whole, and the foam fills the gap between each of the battery cells and the first bracket; and / or, The battery cell assembly further includes a mica sheet, which is stacked on a side of the first bracket away from the battery cell.

9. The battery cell module according to any one of claims 1 to 5, characterized in that: Among the two opposite ends of the battery cell, only one end is provided with the first pressure relief valve; 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 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.

10. A battery pack, characterized in that: include: A box body, wherein the box body has a accommodating chamber and a pressure relief chamber that are connected to each other, and a second pressure relief valve is provided on the box body, and the second pressure relief valve can connect the pressure relief chamber to the external space of the box body; A plurality of battery cell modules according to any one of claims 1 to 9, wherein the plurality of battery cell modules are arranged in the accommodating cavity along the first direction; and A connecting piece, wherein the connecting piece is provided with a first connecting groove extending along the first direction, the connecting piece is sealed between the spacing spaces of 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.

11. The battery pack according to claim 10, characterized in that: When the battery cell module further includes a pressure relief plate, a second bracket and a connecting tube, the first connecting groove is connected to the adjacent pressure relief openings and the connecting tube 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 end portions 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 tube, and the second connecting groove is not connected to the external space.

12. The battery pack according to claim 11, characterized in that: The first connecting groove includes two first sub-grooves respectively arranged on two opposite sides of the connecting piece 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 connecting piece 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 module and the connecting pipe; and / or, The accommodating chamber is connected with the pressure relief chamber through a connecting hole. The battery pack includes a connecting piece extending along the second direction to be sealed and inserted in the connecting hole. The connecting piece is inserted in the connecting hole and has a third connecting groove connected to the first connecting groove at one end.

13. The battery pack according to claim 11 or 12, characterized in that: For any two adjacent battery cell modules, among the two battery cells facing each other with the pressure relief plate interposed therebetween, only one of the battery cells has its first pressure relief valve facing the other battery cell.

Images