Battery module and battery pack

Abstract

The utility model discloses a battery module and a battery pack, the battery module comprises a plurality of single batteries, each single battery is provided with an end face, the end face is provided with a tab, the battery module also comprises a plurality of first connecting pieces and a plurality of second connecting pieces, the first connecting pieces and the second connecting pieces are flexible pieces, each first connecting piece is provided with a first connecting part, a second connecting part and a bending part, the first connecting parts and the second connecting parts are sheet-shaped, two ends of the bending parts are respectively connected with the first connecting parts and the second connecting parts, the plurality of single batteries are overlapped, the first connecting parts are connected with tabs of two adjacent single batteries, the second connecting pieces are sheet-shaped, and the second connecting pieces are connected with the second connecting parts of two adjacent first connecting pieces. And the second connecting piece, the first connecting part and the second connecting part are overlapped on the end surface. When the single batteries expand, the first connecting pieces and the second connecting pieces can absorb the expansion of the single batteries more easily in a deformation manner, so that the stability of connection between the single batteries is ensured.

Description

Technical Field

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

[0002] The soft-pack lithium-ion single cell battery has a "deep breathing" effect in the free state during the charge and discharge process. Specifically, the single cell battery has a significant volume change. Compared with the uncharged state, the lithium metal battery will expand when fully charged. In other words, the "deep breathing" effect of the single cell battery will cause the single cell battery to expand, resulting in uneven thickness and slippage between the single cells. The deformation of the lithium metal battery is not conducive to the charge and discharge cycle. Therefore, a binding force needs to be applied in the thickness direction of the single cell battery to ensure the cycle.

[0003] In order to improve the energy density of the battery, multiple single cells are set in the battery pack, and the multiple single cells are connected in series and parallel through the PCB board. In order to avoid the PCB board and the connected pole ears from breaking, generally only the four sides of the single cell are added with restraints. However, the slippage of the single cell due to the "deep breathing" effect may cause the single cell and the PCB board to be misaligned. In severe cases, the PCB board may be broken or the pole ears may be torn off, resulting in the overall failure of the battery pack, resulting in low reliability and poor safety of the battery pack. Utility Model Content

[0004] The purpose of the embodiments of the utility model is to provide a battery module and a battery pack, which can restrain the six sides of a single battery and have high reliability and good safety.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, a battery module is provided, comprising a plurality of single cells, each of which has an end face provided with a pole ear, and further comprising a plurality of first connectors and a plurality of second connectors, wherein the first connector and the second connector are both flexible members, the first connector having a first connecting portion, a second connecting portion and a bending portion, the first connecting portion and the second connecting portion are both in the shape of a sheet, the two ends of the bending portion are respectively connected to the first connecting portion and the second connecting portion, a plurality of single cells are overlapped, the first connecting portion connects the pole ears of two adjacent single cells, the second connector is in the shape of a sheet, the second connector connects the second connecting portions of two adjacent first connectors, and the second connector, the first connecting portion and the second connecting portion are overlapped on the end face.

[0007] As a preferred solution of the battery module, it also includes a support member, the single battery has a battery core portion and an edge sealing portion, the thickness of the battery core portion is greater than the thickness of the edge sealing portion, the support member is arranged between the edge sealing portions of two adjacent single batteries, and the side surface of the support member is in contact with the first connecting member and / or the second connecting member.

[0008] As a preferred solution of the battery module, the support member is a flexible support block.

[0009] As a preferred solution of the battery module, a first buffer is arranged between two adjacent single batteries, and the first buffer is in a sheet shape.

[0010] As a preferred solution for the battery module, the pole ear includes a third connecting portion and a fourth connecting portion, the fourth connecting portion is connected to the battery cell in the single battery through the third connecting portion, the third connecting portion and the fourth connecting portion are both sheet-shaped, the fourth connecting portion is vertically connected to the third connecting portion, the fourth connecting portion is parallel to the end face, and the fourth connecting portion is connected to the first connecting portion.

[0011] In a second aspect, a battery pack is provided, comprising a box and the above-mentioned battery module, wherein the battery module is arranged in the box, and a side surface of the battery module is in contact with an inner wall of the box.

[0012] As a preferred solution for the battery pack, it also includes a wire and a second buffer. The box is provided with a current output socket, the battery module has a power transmission side, the second connecting member of the battery module is provided on the power transmission side, the two ends of the wire are respectively connected to the current output socket and the second connecting member, and the second buffer is provided between the power transmission side and the inner wall of the box.

[0013] As a preferred solution of the battery pack, a wiring groove is provided in the second buffer component, and the wire is arranged in the wiring groove.

[0014] As a preferred solution for the battery pack, the second buffer component is also provided with a weight-reducing hole.

[0015] As a preferred solution for the battery pack, a plurality of the battery modules are arranged in the box body, and the box body is also provided with a plurality of partitions, the partitions are fixed to the inner wall of the box body, the partitions are arranged between two adjacent battery modules, and the partitions are in contact with the sides of the battery modules.

[0016] The beneficial effects of the utility model are as follows: by setting a plurality of first connectors and second connectors, the single cells are connected separately through the first connectors, and the cooperation of the first connector and the second connector replaces the original integrated PCB board. When the single cell expands, the first connector and the second connector can more easily absorb the expansion of the single cell by deformation, thereby avoiding the pole ear from being torn and the first connector and the second connector from being separated from the pole ear of the single cell, thereby ensuring the stability of the connection between the single cells and avoiding short circuit in the battery module; by setting the second connector, the first connecting part and the second connecting part to overlap on the end face of the single cell, the overall shape of the battery module can be close to a rectangular parallelepiped, and the first connector and the second connector are both flexible, so the external restraining structure can provide compression and restraint for the six sides of the battery module, reduce the slippage phenomenon during the expansion of the single cell, reduce the deformation of the battery module, and improve the reliability and safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below based on the drawings and embodiments.

[0018] Figure 1 Schematic diagram of the connection between the single battery and the first connecting member according to an embodiment of the utility model Figure 1 .

[0019] Figure 2 Schematic diagram of the connection between the single battery and the first connecting member according to an embodiment of the utility model Figure 2 .

[0020] Figure 3 Schematic diagram of the connection between the single battery and the first connecting member according to an embodiment of the utility model Figure 3 .

[0021] Figure 4 Schematic diagram of the connection between the single battery, the first connector and the second connector according to an embodiment of the utility model Figure 1 .

[0022] Figure 5 Schematic diagram of the connection between the single battery, the first connector and the second connector according to an embodiment of the utility model Figure 2 .

[0023] Figure 6 This is a schematic diagram of a battery module according to an embodiment of the present invention.

[0024] Figure 7 A schematic diagram of connecting a single battery and a first connecting member according to another embodiment of the utility model Figure 1 .

[0025] Figure 8A schematic diagram of connecting a single battery and a first connecting member according to another embodiment of the utility model Figure 2 .

[0026] Fig. 9 A schematic diagram of connecting a single battery and a first connecting member according to another embodiment of the utility model Figure 3 .

[0027] Fig.10 This is a schematic diagram of the connection between a single battery, a first connector and a second connector according to another embodiment of the utility model.

[0028] Fig.11 This is a schematic diagram of a battery module according to another embodiment of the present invention.

[0029] Fig.12 It is a schematic cross-sectional view of a battery pack according to an embodiment of the present utility model.

[0030] Fig.13 This is a schematic diagram of the battery pack described in an embodiment of the utility model.

[0031] Fig.14 This is a schematic diagram of a battery pack according to an embodiment of the present utility model (one of the splicing plates is not shown).

[0032] Fig.15 This is a schematic diagram of the second buffer member according to an embodiment of the utility model.

[0033] Fig.16 This is a schematic diagram of the box and partitions described in an embodiment of the utility model (one of the splicing plates is not shown).

[0034] In the figure:

[0035] 1. Box body; 11. Splicing board; 12. Spacer board; 13. Current output socket;

[0036] 2. Second buffer; 21. Wire routing groove; 22. Weight reduction hole;

[0037] 3. Battery module; 31. Power transmission side; 32. Single battery; 321. Edge sealing part; 322. Tab; 323. Battery core; 33. First connecting part; 331. First connecting part; 332. Second connecting part; 34. Second connecting part; 35. Support part; 36. First buffer part. DETAILED DESCRIPTION

[0038] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] like Figure 6 and Fig.11 As shown (part of the reference numerals refer to Figures 1 to 5 , Figures 7 to 10 ), a battery module 3 provided by the utility model comprises a plurality of single cells 32, a plurality of first connectors 33 and a plurality of second connectors 34, the single cell 32 having an end face, the end face being provided with a pole ear 322, the first connector 33 and the second connector 34 being both flexible members, that is, the first connector 33 and the second connector 34 are both flexible, and the first connector 33 and the second connector 34 can be deformed when under pressure, the first connector 33 has a first connecting portion 331, a second connecting portion 332 and a bending portion, the first connecting portion 331 and the second connecting portion 332 are both sheet-shaped, and the two ends of the bending portion are respectively connected to the first connecting portion 331 and the second connecting portion 332, a plurality of single cells 32 are arranged in an overlapping manner, the first connecting portion 331 connects the pole ears 322 of two adjacent single cells 32, the second connector 34 is sheet-shaped, the second connector 34 connects the second connecting portions 332 of two adjacent first connectors 33, and the second connector 34, the first connecting portion 331 and the second connecting portion 332 are overlapped on the end face.

[0041] By providing a plurality of first connectors 33 and second connectors 34, the single cells 32 are connected individually through the first connectors 33. The cooperation of the first connectors 33 and the second connectors 34 replaces the original integrated PCB board (Printed Circuit Board, compared with the traditional PCB board connection, in this embodiment, when the single cell 32 expands, the first connector 33 and the second connector 34 can more easily absorb the expansion of the single cell 32 by deformation, thereby preventing the pole ear 322 from being torn, and also preventing the first connector 33 and the second connector 34 from being separated from the pole ear 322 of the single cell 32, thereby ensuring the stability of the connection between the single cells 32 and avoiding short circuit in the battery module 3; by arranging the second connector 34, the first connecting part 331 and the second connecting part 332 to overlap on the end face of the single cell 32, the overall shape of the battery module 3 can be close to a rectangular parallelepiped, and the first connector 33 and the second connector 34 are both flexible, then, the external restraining structure can provide compression and restraint for the six sides of the battery module 3, reduce the slippage phenomenon during the expansion of the single cell 32, reduce the deformation of the battery module 3, and improve the reliability and safety of the battery module 3.

[0042] In this embodiment, the first connecting member 33 and the second connecting member 34 are both nickel sheets, and the first connecting member 33 is bent to form a first connecting portion 331 , a bent portion, and a second connecting portion 332 .

[0043] The nickel sheet of this embodiment replaces the original PCB board, which can reduce the weight of the battery module 3 and achieve a lightweight design.

[0044] Further, see Figure 6 and Fig.11 The battery module 3 includes a support member 35, and the single battery 32 has a battery core portion 323 and an edge sealing portion 321. The thickness of the battery core portion 323 is greater than the thickness of the edge sealing portion 321. A support member 35 is arranged between the edge sealing portions 321 of two adjacent single batteries 32. The support member 35 abuts against the side of the edge sealing portion 321, and the side of the support member 35 is in contact with the first connecting member 33 and the second connecting member 34, and the side of another part of the support member 35 is in contact with the second connecting member 34 alone. The single cell 32 in this embodiment is a soft-pack battery, and the edge sealing portion 321 is an aluminum-plastic film edge sealing, which is an inherent structure of the soft-pack battery. A support member 35 is provided, and the support member 35 can fill the gap between the edge sealing portions 321 of two adjacent single cells 32 to reduce the deformation of the edge sealing portions 321. The support member 35 can provide support for the first connecting member 33 and the second connecting member 34, reduce the bending degree of the first connecting member 331, the second connecting member 332 and the second connecting member 34, and improve the reliability of the battery module 3.

[0045] In this embodiment, the support member 35 is a flexible support block. It is understandable that the single battery 32 will expand during the charging and discharging process, and the volume of the single battery 32 will change. The support member 35 is provided with a flexible support block, and the support member 35 is flexible. Then, the support member 35 can absorb the deformation of the single battery 32 to a certain extent, reduce the deformation of the battery module 3, and improve the reliability and safety of the battery module 3. Exemplarily, the support member 35 can be EVA foam (ethylene-vinylacetate copolymer).

[0046] Reference Figure 6 and Fig.11 The hardness of the support members 35 located on both sides of the battery module 3 may be greater than the hardness of the support member 35 located at the center of the battery module 3 . The support members 35 located on both sides of the battery module 3 are in direct contact with the external restraining structure, and can provide positioning for the single battery 32 .

[0047] Preferably, a first buffer 36 is provided between two adjacent single cells 32, and the first buffer 36 is in sheet form. The provision of the first buffer 36 can also absorb the deformation of the single cells 32, reduce the deformation of the battery module 3, and improve the reliability and safety of the battery module 3. The first buffer 36 can be EVA foam.

[0048] Further, the tab 322 of the single battery 32 includes a third connection portion and a fourth connection portion, the fourth connection portion of the tab 322 is connected to the cell in the single battery 32 through the third connection portion of the tab 322, the third connection portion and the fourth connection portion are both in sheet form, the fourth connection portion is vertically connected to the third connection portion, that is, the sheet tab 322 is bent 90° to form the third connection portion and the fourth connection portion, the fourth connection portion is parallel to the end face, and the fourth connection portion is connected to the first connection portion 331. By setting the fourth connection portion to be parallel to the end face of the single battery 32 and connecting the fourth connection portion to the first connection portion 331, the connection position of the tab 322 and the first connection member 33 can be avoided from being bent. On the one hand, the difficulty of connecting the tab 322 and the first connection member 33 can be reduced, and on the other hand, the influence of bending on the connection effect can be avoided, thereby improving the reliability of the connection between the tab 322 and the first connection member 33.

[0049] In this embodiment, the first connection portion 331 and the tab 322 are welded, and the second connection portion 332 and the second connection member 34 are also welded. Further, ultrasonic welding, laser welding or other welding methods may be used.

[0050] The single cell 32 generally has two tabs 322 , one tab 322 being used as a positive electrode and the other tab 322 being used as a negative electrode. Figures 1 to 6The two tabs 322 of the single battery 32 are located on the same side, which is called a single-end tab 322 battery. The tabs 322 of the single-end tab 322 battery extend from the same end surface of the single battery 32. Figures 7 to 11 The two tabs 322 of the single battery 32 are distributed on both sides of the single battery 32 , which is recorded as a double-ended tab 322 battery. The tabs 322 of the double-ended tab 322 battery extend from two end surfaces of the single battery 32 .

[0051] Reference Figures 1 to 6 For single-ended 322-type batteries, the battery module 3 can be produced by the following steps:

[0052] Step 101, reference Figure 1 , the (positive) tab 322 and the (negative) tab 322 of the two single cells 32 (single-end tab 322 battery) are connected and assembled by ultrasonic welding using the first connecting member 33 (nickel sheet);

[0053] Step 102, reference Figure 2 ,exist Figure 1 On the basis of the above, the tabs 322 of the two single batteries 32 (batteries with single-ended tabs 322) are bent 90°, the two single batteries 32 (batteries with single-ended tabs 322) are stacked, and a first buffer 36 is placed between the two single batteries 32 (batteries with single-ended tabs 322), and then the first connector 33 (nickel sheet) is bent 90° to make the first connector 33 L-shaped; this step forms a battery assembly;

[0054] Step 103, reference Figure 3 , multiple Figure 2 The battery combination in the stacking is ensured to place a first buffer member 36 between every two single batteries 32 (single-end tab 322 batteries);

[0055] Step 104, reference Figure 4 ,exist Figure 3 Based on the design requirements of the series and parallel connection of the circuit in the battery module 3, the second connecting member 34 is used to connect Figure 2 The battery assembly shown is connected via a second connector 34, and the second connector 34 (nickel sheet) is connected to the second connecting portion 332 of the first connector 33 (nickel sheet) by ultrasonic welding;

[0056] Step 105, reference Figure 5 ,exist Figure 4 On the basis of the above, the redundant part of the first connecting member 33 (nickel sheet) is cut off, and then the first connecting member 33 (nickel sheet) is further bent by 90° to form a bent portion of the first connecting member 33. At this time, the first connecting portion 331 and the second connecting portion 332 on the first connecting member 33 are overlapped;

[0057] Step 106, reference Figure 6 ,exist Figure 5 On the basis of the support member 35, the support member 35 is filled into the gap between the single batteries 32.

[0058] Reference Figures 7 to 11 For double-ended 322 batteries, the battery module 3 can be produced by the following steps:

[0059] Step 201, reference Figure 7 , ultrasonically weld the (positive) tab 322 and (negative) tab 322 of the 9-cell battery 32 (double-ended tab 322 battery) to the two first connectors 33 (nickel sheets);

[0060] Step 202, reference Figure 8 ,exist Figure 7 On the basis of the above, the tab 322 is bent 90°;

[0061] Step 203, reference Fig. 9 ,exist Figure 8 The first connecting member 33 (nickel sheet) is bent 90° on the basis of the above;

[0062] Step 204, reference Fig.10 , multiple Fig. 9 The combination of the single battery 32 (battery with two-ended pole tabs 322) and the first connector 33 shown is stacked, and a first buffer 36 is placed between every two single batteries 32 (battery with two-ended pole tabs 322), and the groove of the pole tab 322 of the single battery 32 is leveled to the ultrasonic welding position of the pole tab 322, and then according to the design requirements of series and parallel connection of the circuit in the battery module 3, multiple single batteries 32 (batteries with two-ended pole tabs 322) are connected by using the second connector 34 (nickel sheet);

[0063] Step 205, reference Fig.11 :exist Fig.10 On the basis of the first connecting member 33 (nickel sheet) is bent 90 degrees, at this time, the first connecting portion 331 and the second connecting portion 332 on the first connecting member 33 are overlapped.

[0064] Reference Figures 12 to 16 This embodiment further provides a battery pack, including a box body 1 and a battery module 3 in any of the above embodiments, wherein the battery module 3 is disposed in the box body 1, and the side surface of the battery module 3 is in contact with the inner wall of the box body 1. The box body 1 in this embodiment is recorded as the restraining structure mentioned in the above embodiments. Since the battery module 3 is in the shape of a rectangular parallelepiped, the design difficulty of the restraining structure can be reduced, that is, the flat structure in the box can be used to restrain the battery module 3, thereby reducing the design difficulty of the battery pack and thus reducing the cost.

[0065] Furthermore, the battery pack also includes a wire and a second buffer 2, a current output seat 13 is provided on the box body 1, the battery module 3 has a power transmission side 31 (the end faces of a plurality of single cells 32 are spliced ​​and combined to form the power transmission side 31), the second connector 34 of the battery module 3 is provided on the power transmission side 31, the two ends of the wire are respectively connected to the current output seat 13 and the second connector 34, and the second buffer 2 is provided between the power transmission side 31 and the inner wall of the box body 1. By providing the second buffer 2, the second buffer 2 can absorb the expansion of the single cell 32, thereby reducing the squeezing of the wire and improving the reliability of the battery pack. The second buffer 2 can be EVA foam.

[0066] Preferably, a wiring groove 21 is provided in the second buffer member 2, and the wire is arranged in the wiring groove 21. By providing the wiring groove 21, the compression of the wire by the single battery 32 in a collision state can be further reduced, thereby improving the reliability of the battery pack.

[0067] Reference Fig.15 The second buffer member 2 is also provided with a weight-reducing hole 22. By providing the weight-reducing hole 22, the weight of the second buffer member 2 can be reduced, thereby reducing the weight of the entire battery pack and achieving a lightweight design of the battery pack.

[0068] Furthermore, a plurality of battery modules 3 are arranged in the box body 1, referring to Fig.16 The box 1 is also provided with a plurality of partitions 12, which are fixed to the inner wall of the box 1, and a partition 12 is provided between two adjacent battery modules 3, and the partition 12 is in contact with the side of the battery module 3. By providing the partition 12, the partition 12 can separate the space in the box 1, and restrain each battery module 3 separately, so as to avoid direct contact between the battery modules 3, improve the restraint effect on the battery modules 3, and thus improve the reliability of the battery pack.

[0069] In this embodiment, the box body 1 is in the shape of a rectangular parallelepiped, and is formed by six splicing plates 11 spliced ​​together and enclosed, and the partition plates 12 are fixedly connected to the corresponding splicing plates 11 respectively.

[0070] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0071] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0072] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0073] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A battery module, comprising a plurality of single cells, wherein the single cells have end faces, and the end faces are provided with tabs, wherein: It also includes a plurality of first connecting members and a plurality of second connecting members, wherein the first connecting member and the second connecting member are both flexible members, the first connecting member has a first connecting portion, a second connecting portion and a bending portion, the first connecting portion and the second connecting portion are both sheet-shaped, and the two ends of the bending portion are respectively connected to the first connecting portion and the second connecting portion, and a plurality of single batteries are overlapped, the first connecting portion connects the pole ears of two adjacent single batteries, the second connecting member is sheet-shaped, the second connecting member connects the second connecting portions of two adjacent first connecting members, and the second connecting member, the first connecting portion and the second connecting portion are overlapped on the end surface.

2. The battery module according to claim 1, characterized in that: It also includes a support member, the single battery has a battery core and an edge sealing portion, the thickness of the battery core is greater than the thickness of the edge sealing portion, the support member is arranged between the edge sealing portions of two adjacent single batteries, and the side surface of the support member is in contact with the first connecting member and / or the second connecting member.

3. The battery module according to claim 2, characterized in that: The support member is a flexible support block.

4. The battery module according to claim 1, characterized in that: A first buffer is arranged between two adjacent single batteries, and the first buffer is in a sheet shape.

5. The battery module according to claim 1, characterized in that: The pole ear includes a third connecting portion and a fourth connecting portion, the fourth connecting portion is connected to the battery cell in the single battery through the third connecting portion, the third connecting portion and the fourth connecting portion are both sheet-shaped, the fourth connecting portion is vertically connected to the third connecting portion, the fourth connecting portion is parallel to the end face, and the fourth connecting portion is connected to the first connecting portion.

6. A battery pack, characterized in that: It comprises a box body and the battery module according to any one of claims 1 to 5, wherein the battery module is arranged in the box body, and the side surface of the battery module is in contact with the inner wall of the box body.

7. The battery pack according to claim 6, characterized in that: It also includes a wire and a second buffer. The box is provided with a current output socket. The battery module has a power transmission side. The second connecting member of the battery module is provided on the power transmission side. The two ends of the wire are respectively connected to the current output socket and the second connecting member. The second buffer is provided between the power transmission side and the inner wall of the box.

8. The battery pack according to claim 7, characterized in that: A wiring groove is arranged in the second buffer component, and the wire is arranged in the wiring groove.

9. The battery pack according to claim 7, characterized in that: The second buffer member is also provided with a weight-reducing hole.

10. The battery pack according to claim 6, characterized in that: A plurality of the battery modules are arranged in the box body, and a plurality of partition plates are also arranged in the box body. The partition plates are fixed to the inner wall of the box body, the partition plates are arranged between two adjacent battery modules, and the partition plates are in contact with the sides of the battery modules.

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