Battery pack

Abstract

The utility model discloses a battery pack, including guide cold bottom plate and at least one battery module, and battery module limit setting is in guide cold bottom plate, and battery module includes multiple electric core group, first gasket and second gasket, multiple electric core group arranges along the first direction, and the first gasket is arranged between two electric core groups of adjacent, and one electric core group includes multiple electric core arranging along the first direction, and the second gasket is arranged between two electric cores of same group and adjacent, and the stiffness coefficient of first gasket along the first direction is less than the stiffness coefficient of second gasket along the first direction, and the thermal conductivity of first gasket is less than the thermal conductivity of second gasket, and it can effectively promote the use security of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a battery pack. Background Technology

[0002] A battery pack typically consists of battery modules, which in turn typically include multiple battery cells housed within the pack's casing. To reduce the size of the battery pack, the gap between the battery modules and the casing is usually small, resulting in a compact structure. However, on the one hand, a more compact structure makes it easier for the heat dissipated by the batteries during use to interact and concentrate. On the other hand, the smaller gap between the battery modules and the casing also makes the cells more susceptible to excessive compression and damage when they expand during use. These factors combined contribute to a lower level of safety in battery pack operation. Utility Model Content

[0003] The purpose of this utility model is to provide a battery pack that can alleviate the problem of heat concentration in the battery module and excessive compression caused by cell expansion during battery pack use, thereby effectively improving the safety of battery pack use.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A battery pack is provided, comprising:

[0006] Cooling base plate; and,

[0007] At least one battery module, the battery module being positioned on the cooling base plate, the battery module including multiple cell groups, a first gasket and a second gasket, the multiple cell groups being arranged along a first direction, the first gasket being sandwiched between two adjacent cell groups, a cell group including multiple cells arranged along the first direction, the second gasket being sandwiched between two adjacent cells in the same group;

[0008] The stiffness coefficient of the first gasket along the first direction is less than that of the second gasket along the first direction, and the thermal conductivity of the first gasket is less than that of the second gasket.

[0009] As a preferred embodiment of the battery pack, the thickness of the first pad is less than the thickness of the second pad along the first direction.

[0010] As a preferred technical solution for the battery pack, at least two of the multiple cell groups include different numbers of cells.

[0011] As a preferred technical solution for the battery pack, the difference in the number of cells in any two cell groups is 0 or 1.

[0012] As a preferred technical solution of the battery pack, the battery module further includes two end plate structures and a steel strip. The two end plate structures are respectively disposed on two opposite sides of the multiple cell groups along the first direction. The end plate structures are detachably fixed to the cooling base plate, and the steel strip is tied to the outer periphery of the cell group, the first gasket, the second gasket and the end plate structure as a whole.

[0013] As a preferred technical solution of the battery pack, the end plate structure includes a protective plate and a buffer member. The protective plate covers at least one side surface of the nearest battery cell, and the buffer member abuts against the side of the protective plate away from the battery cell.

[0014] The buffer includes reinforcing ribs, which include a plurality of first reinforcing ribs, a plurality of second reinforcing ribs, and a plurality of third reinforcing ribs. The plurality of first reinforcing ribs are spaced apart and parallel to each other, and the plurality of second reinforcing ribs are spaced apart and parallel to each other. The extension directions of the first and second reinforcing ribs are perpendicular to each other. The plurality of first reinforcing ribs and the plurality of second reinforcing ribs are intersected and connected to form a grid-like structure. The third reinforcing ribs are arranged along the diagonal of the grid formed by the first and second reinforcing ribs to connect with the first and second reinforcing ribs to form a triangular structure.

[0015] As a preferred technical solution of the battery pack, the reinforcing rib further includes a fourth reinforcing rib, wherein the first reinforcing rib and / or the second reinforcing rib and / or the third reinforcing rib are connected to the fourth reinforcing rib, and the fourth reinforcing rib is cylindrical or cylindrical.

[0016] As a preferred technical solution of the battery pack, the first reinforcing rib and / or the second reinforcing rib are connected to a cylindrical reinforcing rib. The battery module also includes fasteners and a cover plate covering the side of the buffer member away from the protective plate. The cover plate is provided with a connecting hole corresponding to the cylindrical reinforcing rib. The fastener is partially inserted into the interior of the cylindrical reinforcing rib and the connecting hole and securely connects the cover plate to the buffer member.

[0017] As a preferred technical solution of the battery pack, the buffer also includes a plate and a frame. The plate abuts against the side of the protective plate away from the battery cell. The frame is disposed on the side of the plate away from the protective plate. The frame is detachably fixed to the cooling base plate. The reinforcing rib is disposed on the side of the plate away from the protective plate and located in the space surrounded by the frame. Both ends of the first reinforcing rib and the second reinforcing rib are connected to the frame.

[0018] As a preferred technical solution for the battery pack, the first direction, the second direction, and the third direction are mutually perpendicular, and the third direction is perpendicular to the surface of the cooling base plate.

[0019] The frame is provided with limiting grooves on two opposite parts along the second direction, the steel strip is located in the limiting groove, and / or, the frame is provided with a setting groove on the side away from the cooling base plate along the third direction. The battery module also includes a conductive block, which is partially located in the setting groove, and the conductive block is electrically connected between the battery cell included in the battery module and the circuit outside the battery module.

[0020] As a preferred technical solution of the battery pack, the cooling base plate is provided with two first crossbeams on one side facing the battery module. The first crossbeams extend along a direction perpendicular to the first direction and parallel to the surface of the cooling base plate. The two first crossbeams are spaced apart and parallel to each other along the first direction. The bottom of the protective plate and the battery cell are placed on the cooling base plate and located between the two first crossbeams. The bottom of the buffer is located on the side of the bottom of the protective plate away from the cooling base plate, and the bottom of the buffer is detachably fixed to the side of the first crossbeam away from the cooling base plate.

[0021] As a preferred technical solution of the battery pack, the cooling base plate is provided with two second crossbeams on one side facing the battery module. The second crossbeams extend along the first direction, and the two second crossbeams are spaced apart and parallel to each other along the second direction. The battery module is located between the two second crossbeams, and at least one of the second crossbeams is provided with a handle. The second direction is perpendicular to the first direction and parallel to the surface of the cooling base plate.

[0022] As a preferred technical solution of the battery pack, the battery pack includes a plurality of battery modules, which are arranged along a second direction, wherein the second direction is perpendicular to the first direction and parallel to the surface of the cooling base plate.

[0023] The beneficial effects of this utility model are as follows:

[0024] By directly mounting the battery module on the cooling base plate, the heat dissipation efficiency of the battery module can be improved. Furthermore, by including multiple cell groups in the battery module, and sandwiching a first gasket with a low thermal conductivity between adjacent cell groups to reduce the mutual influence of heat generated by adjacent cell groups using the better thermal insulation performance of the first gasket, and sandwiching a second gasket with a high stiffness coefficient between adjacent cells in the same group to absorb more expansion force and reduce the compressive force on the cells during expansion, the problem of heat concentration in the battery module and excessive compression caused by cell expansion during battery pack use can be alleviated, effectively improving the safety of battery pack use. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a three-dimensional structural diagram of the battery pack described in the embodiment.

[0027] Figure 2 This is an exploded view of the battery pack structure described in the embodiment.

[0028] Figure 3 This is an exploded view of the battery module described in the embodiment.

[0029] Figure 4 This is a three-dimensional structural diagram of the end plate structure described in the embodiment.

[0030] Figure 5 This is a structural exploded view of the end plate structure described in the embodiment.

[0031] Figure 6 This is an exploded view of the structure of the buffer, conductive block and cover plate described in the embodiment.

[0032] In the picture:

[0033] 1. Cooling base plate; 11. First crossbeam; 12. Second crossbeam; 13. Handle; 14. Connecting structure;

[0034] 2. Battery module; 20. Cell assembly; 200. Cell; 21. First gasket; 22. Second gasket; 23. End plate structure; 230. Protective plate; 231. Buffer component; 2311. Plate body; 2311a. Through hole; 2312. Frame body; 2312a. Limiting groove; 2312b. Setting groove; 2313. First reinforcing rib; 2314. Second reinforcing rib; 2315. Third reinforcing rib; 2316. Fourth reinforcing rib; 2317. Cylindrical reinforcing rib; 232. Conductive block; 24. Steel strip; 25. Electrical connection structure; 26. Cover plate; 260. Connection hole. Detailed Implementation

[0035] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] like Figures 1 to 3 As shown, this utility model provides a battery pack that can be installed in an external device and used as a power source for that device. The external device may include, but is not limited to, a car or a battery storage cabinet. Specifically, the battery pack includes a cooling base plate 1 and at least one battery module 2. The battery module 2 is positioned on the cooling base plate 1. The battery module 2 includes multiple cell groups 20, a first gasket 21, and a second gasket 22. The multiple cell groups 20 are arranged along a first direction S1. A first gasket 21 is sandwiched between two adjacent cell groups 20. One cell group 20 includes multiple cells 200 arranged along the first direction S1. A second gasket 22 is sandwiched between two adjacent cells 200 in the same group. The stiffness coefficient of the first gasket 21 along the first direction S1 is less than that of the second gasket 22 along the first direction S1, and the thermal conductivity of the first gasket 21 is less than that of the second gasket 22. Figures 1 to 3 As shown, Figures 1 to 3The arrow in the diagram indicates the first direction, S1.

[0039] By directly mounting the battery module 2 onto the cooling base plate 1, the heat dissipation efficiency of the battery module 2 can be improved. Furthermore, by including multiple cell groups 20 in the battery module 2, and sandwiching a first gasket 21 with a low thermal conductivity between adjacent cell groups 20 to reduce the mutual influence of heat generated by adjacent cell groups 20 using the better heat insulation performance of the first gasket 21, and sandwiching a second gasket 22 with a high stiffness coefficient between adjacent cells 200 in the same group to absorb more expansion force and reduce the mutual compression force on the cells 200 during expansion, the problem of heat concentration in the battery module 2 and excessive compression caused by cell expansion during battery pack use can be alleviated, effectively improving the safety of battery pack use.

[0040] In this battery module 2, all the cells 200 can be electrically connected in phases through an electrical connection structure 25 including but not limited to conductive sheets and conductive wires. Specifically, the cells 200 can be connected in series or in parallel according to design requirements.

[0041] Optionally, along the first direction S1, the thickness of the first pad 21 is greater than the thickness of the second pad 22, thereby improving the heat insulation performance of the first pad 21 and allowing for a larger spacing between adjacent battery cell groups 20, thus further reducing the mutual influence of heat emitted by the two adjacent battery cell groups 20. Conversely, by making the thickness of the second pad 22 smaller, the overall size of the battery module 2 along the first direction S1 can be reduced, enabling a more miniaturized design.

[0042] Optionally, among the multiple cell groups 20, at least two cell groups 20 may include different numbers of cells 200, thereby allowing for more flexible setting of the number of cells 200 included in each cell group 20 according to actual usage requirements.

[0043] For example, when the total number of cell groups 20 included in the battery module 2 is difficult to divide equally into multiple cell groups 20 with the same number of cells 200, at least two cell groups 20 may be included with different numbers of cells 200. Alternatively, when the battery module 2 is installed in an external device, and is located near a location in the external device that is prone to heat generation, the cell groups 20 near that location may include fewer cells 200 to further alleviate the problem of heat concentration.

[0044] Optionally, the difference in the number of cells 200 included in any two cell groups 20 is 0 or 1. That is, the number of cells 200 included in the two cell groups 20 can be the same, or the number of cells 200 included in the two cell groups 20 can be different with a maximum difference of 1. This ensures that the heating and expansion conditions of each cell group 20 are more similar, reducing the possibility of heat concentration or excessive pressure on some cell groups 20. For example, Figure 3 As shown, Figure 3 The example shows a battery module 2 comprising four cell groups 20, wherein three cell groups 20 comprise three cells 200 and the remaining cell group 20 comprises two cells 200.

[0045] In other embodiments, all cell groups 20 may include the same number of cells 200, thereby improving the consistency of heating and expansion of each cell group 20.

[0046] Optionally, the battery module 2 also includes two end plate structures 23 and a steel strip 24. The two end plate structures 23 are respectively disposed on two opposite sides of the multiple cell groups 20 along the first direction S1. The end plate structures 23 are detachably fixed to the cooling base plate 1. The steel strip 24 is tied to the outer periphery of the cell group 20, the first gasket 21, the second gasket 22 and the end plate structure 23 as a whole. Thus, the cell group 20, the first gasket 21, the second gasket 22 and the end plate structure 23 can be tied together by the steel strip 24 to form a whole. This can make the structure of the battery module 2 more stable and can also limit the position of the cell group 20.

[0047] Please combine Figures 4 to 6 As shown, optionally, the end plate structure 23 includes a protective plate 230 and a buffer member 231. The protective plate 230 covers at least one side surface of the nearest battery cell 200, thereby protecting the nearest battery cell 200 by the protective plate 230 to prevent the buffer member 231 from hitting the surface of the battery cell 200 and causing damage to the battery cell 200.

[0048] Furthermore, the buffer 231 includes reinforcing ribs, which include multiple first reinforcing ribs 2313, multiple second reinforcing ribs 2314, and multiple third reinforcing ribs 2315. The multiple first reinforcing ribs 2313 are spaced apart and parallel to each other, and the multiple second reinforcing ribs 2314 are spaced apart and parallel to each other. The extension directions of the first reinforcing ribs 2313 and the multiple second reinforcing ribs 2314 are perpendicular to each other. The multiple first reinforcing ribs 2313 and the multiple second reinforcing ribs 2314 are intersected and connected to form a grid structure. The third reinforcing ribs 2315 are arranged along the diagonal of the grid formed by the first reinforcing ribs 2313 and the second reinforcing ribs 2314 to form a triangular structure with the first reinforcing ribs 2313 and the second reinforcing ribs 2314. This triangular structure and grid structure can be used to disperse and transfer the load on the buffer 231, so as to avoid excessive local stress and damage to the buffer 231 when it is subjected to external force. This allows the buffer 231 to effectively disperse and absorb impact force and effectively enhance the bending resistance of the buffer 231.

[0049] For example, the buffer 231 can be detachably fastened to the cooling base plate 1 by bolts, or can be detachably fixed to the cooling base plate 1 by means including but not limited to snap-fit, interference fit, etc.

[0050] Define the first direction S1, the second direction S2, and the third direction S3 as mutually perpendicular, with the third direction S3 perpendicular to the surface of the cooling base plate 1, as shown in Figure 1 to 2. Figure 6 As shown, Figures 1 to 6 The coordinates in the diagram indicate the first direction S1, the second direction S2, and the third direction S3. Specifically, the protective plate 230 may be disposed on the side surface of the nearest cell 200 facing the protective plate 230 along the first direction S1. Optionally, the protective plate 230 may also extend to cover at least a portion of the side surface of the nearest cell 200 along the second direction S2 and / or along the third direction S3.

[0051] Optionally, the reinforcing rib also includes a fourth reinforcing rib 2316. The first reinforcing rib 2313 and / or the second reinforcing rib 2314 and / or the third reinforcing rib 2315 may be connected to the fourth reinforcing rib 2316. The fourth reinforcing rib 2316 is cylindrical or cylindrical, so that the fourth reinforcing rib 2316 has a better ability to withstand pressure and tension along its own axial direction, and can effectively enhance the compressive and tensile strength of the buffer component 231.

[0052] Specifically, a fourth reinforcing rib 2316 may be provided at the intersection of the first reinforcing rib 2313 and the second reinforcing rib 2314. The first reinforcing rib 2313 may be provided with the fourth reinforcing rib 2316, the second reinforcing rib 2314 may be provided with the fourth reinforcing rib 2316, and the third reinforcing rib 2315 may be provided with the fourth reinforcing rib 2316.

[0053] Optionally, the first reinforcing rib 2313 and / or the second reinforcing rib 2314 may be connected to a cylindrical reinforcing rib 2317. The battery module 2 also includes fasteners (not shown in the figure) and a cover plate 26 covering the side of the buffer 231 away from the protective plate 230. The cover plate 26 is provided with a connecting hole 260 corresponding to the cylindrical reinforcing rib 2317. The fasteners may include, but are not limited to, screws, bolts and combinations of bolts and nuts. The fasteners are partially inserted into the interior of the cylindrical reinforcing rib 2317 and the connecting hole 260 and fasten the cover plate 26 to the buffer 231. Thus, the structure of the reinforcing rib can be covered by the cover plate 26. On the one hand, the structure of the reinforcing rib can be protected and the possibility of damage to the reinforcing rib can be reduced. On the other hand, it is beneficial to disperse and transmit the external force received by the end plate structure 23 to the reinforcing rib through the cover plate 26, so that the buffer 231 can more easily disperse and absorb the external force.

[0054] Specifically, a cylindrical reinforcing rib 2317 may be provided at the intersection of the first reinforcing rib 2313 and the second reinforcing rib 2314. The first reinforcing rib 2313 may be provided with a cylindrical reinforcing rib 2317, and the second reinforcing rib 2314 may be provided with a cylindrical reinforcing rib 2317.

[0055] When the reinforcing rib further includes a fourth reinforcing rib 2316 as described in the aforementioned technical solution, at least part of the cylindrical fourth reinforcing rib 2316 can be a cylindrical reinforcing rib 2317, thereby enabling the fourth reinforcing rib 2316 to be structurally reused.

[0056] Optionally, the buffer 231 also includes a plate 2311 and a frame 2312. The plate 2311 abuts against the side of the protective plate 230 away from the battery cell 200. The frame 2312 is disposed on the side of the plate 2311 away from the protective plate 230. The frame 2312 is detachably fixed to the cooling base plate 1. The reinforcing rib is disposed on the side of the plate 2311 away from the protective plate 230 and is located in the space surrounded by the frame 2312. The two ends of the first reinforcing rib 2313 and the second reinforcing rib 2314 are both connected to the frame 2312. Thus, the structure of the reinforcing rib can be further fixed by the plate 2311 and the frame 2312, so that the structure of the reinforcing rib is more stable and the reinforcing rib is more stable in dispersing and transmitting the external force.

[0057] When the battery module 2 further includes fasteners as described in the aforementioned technical solution, the plate 2311 may be provided with a through hole 2311a that communicates with the internal space of the cylindrical reinforcing rib 2317. The fastener is inserted through the through hole 2311a, the interior of the cylindrical reinforcing rib 2317, and the connecting hole 260, and fastens the cover plate 26 and the buffer 231 together.

[0058] Please combine again Figure 2Optionally, the cooling base plate 1 has two first crossbeams 11 on the side facing the battery module 2. The first crossbeams 11 extend along a direction perpendicular to the first direction S1 and parallel to the surface of the cooling base plate 1. The two first crossbeams 11 are spaced apart and parallel to each other along the first direction S1. The bottom of the protective plate 230 and the bottom of the battery cell 200 are placed on the cooling base plate 1 and located between the two first crossbeams 11. The bottom of the buffer member 231 is located on the side of the bottom of the protective plate 230 away from the cooling base plate 1, and the bottom of the buffer member 231 is detachably fixed to the first crossbeam 11 away from the cooling base plate. On one side of the first crossbeam 11, the relative position of the battery cell 200 and the cooling base plate 1 can be limited, so that the heat dissipation effect of the cooling base plate 1 on the battery cell 200 is maintained at a state close to the preset value. On the other hand, by placing the bottom of the buffer member 231 on the side of the bottom of the protective plate 230 away from the cooling base plate 1, a height difference is formed between the bottom of the buffer member 231 and the bottom of the protective plate 230. This allows the bottom of the protective plate 230 to be placed on the cooling base plate 1 while the bottom of the buffer member 231 can be connected to the side of the first crossbeam 11 away from the cooling base plate 1. By connecting the buffer member 231 to the cooling base plate 1 through the first crossbeam 11, compared to the technical solution of directly connecting the buffer member 231 to the cooling base plate 1, the direct impact of the buffer member 231 on the cooling base plate 1 during assembly and use can be reduced, and the possibility of damage to the cooling base plate 1 due to external forces acting on the buffer member 231 can be reduced.

[0059] In this context, it is understood that the “bottom” of each of the aforementioned features specifically refers to the part of each feature that is closest to the cooling base plate 1.

[0060] Optionally, the frame 2312 has two opposing portions along the second direction S2, each with a limiting groove 2312a. The steel strip 24 is partially located within the limiting groove 2312a, thereby limiting the relative position of the steel strip 24 and the frame 2312 and improving the stability of the binding effect of the steel strip 24 on the battery cell assembly 20, the first gasket 21, the second gasket 22, and the end plate structure 23 as a whole. Specifically, the steel strip 24 is bound to the outer periphery of the battery cell assembly 20, the first gasket 21, the second gasket 22, and the end plate structure 23 along the direction surrounding the first direction S1.

[0061] Optionally, the frame 2312 has a mounting groove 2312b on the side away from the cooling base plate 1 along the third direction S3. The battery module 2 also includes a conductive block 232, which is partially located in the mounting groove 2312b and is electrically connected between the battery cell 200 included in the battery module 2 and the circuit outside the battery module 2. This allows the battery module 2 to be electrically connected to the circuit outside the battery module 2 via the conductive block 232. For example, the battery module 2 can be electrically connected via the conductive block 232. Compared to other circuits outside the battery module 2 or battery pack, by providing a mounting slot 2312b on the frame 2312 to accommodate the conductive block 232, the relative position of the conductive block 232 and the frame 2312 can be made more stable, thereby making the function of the conductive block 232 to electrically connect the battery module 2 to the circuit outside the battery module 2 more stable. On the other hand, the arrangement of the conductive block 232 and the end plate structure 23 can be made more compact, which is conducive to the overall miniaturization of the battery module 2.

[0062] In some embodiments, the frame 2312 is provided with both a limiting groove 2312a and a setting groove 2312b, so that the overall structure and performance of the battery module 2 are more stable and it is conducive to achieving a more miniaturized design.

[0063] Please combine again Figure 2 As shown, optionally, the cooling base plate 1 has two second crossbeams 12 on the side facing the battery module 2. The second crossbeams 12 extend along the first direction S1, and the two second crossbeams 12 are spaced apart and parallel to each other along the second direction S2. The battery module 2 is located between the two second crossbeams 12. At least one of the second crossbeams 12 is provided with a handle 13. Thus, on the one hand, the relative position of the battery cell 200 and the cooling base plate 1 can be limited by the second crossbeams 12, so that the heat dissipation effect of the cooling base plate 1 on the battery cell 200 is maintained at a state close to the preset state. On the other hand, by providing a handle 13 on the second crossbeam 12, it is convenient for users to install and remove the battery pack from the external device on which the battery pack is located.

[0064] Optionally, the second crossbeam 12 may also be provided with a connection structure 14 for connecting to external equipment. The connection structure 14 may include, but is not limited to, hooks and latches.

[0065] Optionally, the battery pack may include multiple battery modules 2, which are arranged along the second direction S2. This increases the energy storage performance of the battery pack by increasing the number of battery modules 2. Furthermore, by arranging the multiple battery modules 2 along the second direction S2 instead of the first direction S1, the end plate structures 23 of different battery modules 2 can be prevented from blocking each other, thus providing sufficient operating space near the end plate structures 23 for smooth installation and removal of the end plate structures 23 from the cooling base plate 1.

[0066] When, as described in the aforementioned technical solution, the cooling base plate 1 is provided with two first crossbeams 11 on the side facing the battery module 2, since the first crossbeams 11 extend in a direction perpendicular to the first direction S1 and parallel to the surface of the cooling base plate 1, that is, the first crossbeams 11 extend in the second direction S2, the multiple battery modules 2 are arranged in the second direction S2, which also helps to connect the frame 2312 of each battery module 2 to the first crossbeams 11 extending in the second direction S2.

[0067] In other embodiments, the battery pack may also include a housing, so that the battery module 2 is positioned on the cooling base plate 1 by limiting both the cooling base plate 1 and the battery module 2 within the housing.

[0068] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for ease of description and simplification of operation. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0069] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0070] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider 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.

[0071] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A battery pack, characterized in that, include: Cooling base plate (1); as well as, At least one battery module (2) is provided on the cooling base plate (1). The battery module (2) includes multiple cell groups (20), a first gasket (21) and a second gasket (22). The multiple cell groups (20) are arranged along a first direction. The first gasket (21) is sandwiched between two adjacent cell groups (20). One cell group (20) includes multiple cells (200) arranged along the first direction. The second gasket (22) is sandwiched between two adjacent cells (200) in the same group. The stiffness coefficient of the first gasket (21) along the first direction is less than that of the second gasket (22) along the first direction, and the thermal conductivity of the first gasket (21) is less than that of the second gasket (22).

2. The battery pack according to claim 1, characterized in that, Along the first direction, the thickness of the first gasket (21) is less than the thickness of the second gasket (22).

3. The battery pack according to claim 1, characterized in that, Among the multiple battery cell groups (20), at least two of the battery cell groups (20) include different numbers of battery cells (200).

4. The battery pack according to claim 3, characterized in that, The difference in the number of cells (200) included in any two of the cell groups (20) is 0 or 1.

5. The battery pack according to claim 1, characterized in that, The battery module (2) also includes two end plate structures (23) and a steel strip (24). The two end plate structures (23) are respectively disposed on two opposite sides of the multiple cell groups (20) along the first direction. The end plate structures (23) are detachably fixed to the cooling base plate (1). The steel strip (24) is tied to the outer periphery of the cell group (20), the first gasket (21), the second gasket (22) and the end plate structure (23).

6. The battery pack according to claim 5, characterized in that, The end plate structure (23) includes a protective plate (230) and a buffer (231). The protective plate (230) covers at least one side surface of the nearest battery cell (200), and the buffer (231) abuts against the side of the protective plate (230) away from the battery cell (200). The buffer (231) includes reinforcing ribs, which include a plurality of first reinforcing ribs (2313), a plurality of second reinforcing ribs (2314), and a plurality of third reinforcing ribs (2315). The plurality of first reinforcing ribs (2313) are spaced apart and parallel to each other, and the plurality of second reinforcing ribs (2314) are spaced apart and parallel to each other. The extension directions of the first reinforcing ribs (2313) and the second reinforcing ribs (2314) are perpendicular to each other. The plurality of first reinforcing ribs (2313) and the plurality of second reinforcing ribs (2314) are intersected and connected to form a grid-like structure. The third reinforcing ribs (2315) are arranged along the diagonal of the grid formed by the first reinforcing ribs (2313) and the second reinforcing ribs (2314) to form a triangular structure with the first reinforcing ribs (2313) and the second reinforcing ribs (2314).

7. The battery pack according to claim 6, characterized in that, The reinforcing rib further includes a fourth reinforcing rib (2316), wherein the first reinforcing rib (2313) and / or the second reinforcing rib (2314) and / or the third reinforcing rib (2315) are connected to the fourth reinforcing rib (2316), and the fourth reinforcing rib (2316) is cylindrical or cylindrical.

8. The battery pack according to claim 6, characterized in that, The first reinforcing rib (2313) and / or the second reinforcing rib (2314) are connected to a cylindrical reinforcing rib (2317). The battery module (2) also includes fasteners and a cover plate (26) covering the side of the buffer (231) away from the protective plate (230). The cover plate (26) is provided with a connecting hole (260) corresponding to the cylindrical reinforcing rib (2317). The fastener is partially inserted into the interior of the cylindrical reinforcing rib (2317) and the connecting hole (260) and securely connects the cover plate (26) to the buffer (231).

9. The battery pack according to claim 6, characterized in that, The buffer (231) further includes a plate (2311) and a frame (2312). The plate (2311) abuts against the side of the protective plate (230) away from the battery cell (200). The frame (2312) is disposed on the side of the plate (2311) away from the protective plate (230). The frame (2312) is detachably fixed to the cooling base plate (1). The reinforcing rib is disposed on the side of the plate (2311) away from the protective plate (230) and located in the space surrounded by the frame (2312). The two ends of the first reinforcing rib (2313) and the second reinforcing rib (2314) are both connected to the frame (2312).

10. The battery pack according to claim 9, characterized in that, The first direction, the second direction, and the third direction are mutually perpendicular, and the third direction is perpendicular to the surface of the cooling base plate (1). The frame (2312) has two opposing portions along the second direction, each with a limiting groove (2312a). The steel strip (24) is partially located within the limiting groove (2312a). Alternatively, the frame (2312) has a setting groove (2312b) on the side of the frame (2312) that is upward along the third direction away from the cooling base plate (1). The battery module (2) also includes a conductive block (232). The conductive block (232) is partially located in the setting groove (2312b), and the conductive block (232) is electrically connected between the battery cell (200) included in the battery module (2) and the circuit outside the battery module (2).

11. The battery pack according to claim 6, characterized in that, The cooling base plate (1) has two first crossbeams (11) on the side facing the battery module (2). The first crossbeams (11) extend in a direction perpendicular to the first direction and parallel to the surface of the cooling base plate (1). The two first crossbeams (11) are spaced apart and parallel to each other in the first direction. The bottom of the guard plate (230) and the bottom of the battery cell (200) are placed on the cooling base plate (1) and located between the two first crossbeams (11). The bottom of the buffer (231) is located on the side of the bottom of the guard plate (230) away from the cooling base plate (1), and the bottom of the buffer (231) is detachably fixed to the side of the first crossbeam (11) away from the cooling base plate (1).

12. The battery pack according to any one of claims 1-11, characterized in that, The cooling base plate (1) has two second crossbeams (12) on one side facing the battery module (2). The second crossbeams (12) extend along the first direction. The two second crossbeams (12) are spaced apart and parallel to each other along the second direction. The battery module (2) is located between the two second crossbeams (12). At least one of the second crossbeams (12) is provided with a handle (13). The second direction is perpendicular to the first direction and parallel to the surface of the cooling base plate (1).

13. The battery pack according to any one of claims 1-11, characterized in that, The battery pack includes a plurality of battery modules (2), which are arranged along a second direction, wherein the second direction is perpendicular to the first direction and parallel to the surface of the cooling base plate (1).

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