Battery pack

Abstract

The utility model discloses a battery pack, which comprises a plurality of battery cells, the plurality of battery cells are arranged along the thickness direction of the battery cells, each battery cell comprises a shell and an anti-explosion valve, one end of the shell along the width direction of the battery cells is provided with an anti-explosion hole, and the anti-explosion valve is arranged in the anti-explosion hole; the shell is provided with an explosion-proof hole, the reinforcing pieces are arranged on one side, provided with the explosion-proof hole, of the shell and are connected with the shells of the multiple battery cells, and / or the reinforcing pieces are arranged between any two adjacent battery cells, and the reinforcing pieces are connected with the shells of the two adjacent battery cells. According to the battery pack disclosed by the utility model, all the battery cells can be connected together to form a whole, so that the overall rigidity of the shells of all the battery cells is improved, the deformation of the shells of the battery cells is reduced, the risk of cracking of a weak area of the anti-explosion valve is reduced, and the safety of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field especially relates to a battery pack. BACKGROUND

[0002] Since the periphery of the explosion-proof valve and the shell are welded into a whole, and considering the opening of the explosion-proof valve, the local structure design has a weak area with a V or U-shaped section, during the normal charging and discharging process of the battery pack, the shell of the battery cell will be deformed, since the explosion-proof valve and the shell of the battery cell are welded together, the deformation of the shell of the battery cell will cause the deformation of the explosion-proof valve, thereby causing the cracking of the weak area of the explosion-proof valve, thereby affecting the performance and safety of the battery. SUMMARY

[0003] The utility model discloses at least solve one of the technical problems in the prior art. For this purpose, the utility model provides a battery pack, the battery pack reduces the risk of cracking of the weak area of the explosion-proof valve, and improves the safety of the battery pack.

[0004] According to the battery pack of the utility model embodiment, the reinforcing piece is arranged on one side of the shell with the explosion-proof hole and connected with the shells of the plurality of battery cells, and / or the reinforcing piece is arranged between any two adjacent battery cells and connected with the shells of the two adjacent battery cells.

[0005] According to the battery pack of the utility model embodiment, the reinforcing piece is arranged on one side of the shell with the explosion-proof hole and connected with the shells of the plurality of battery cells, and / or the reinforcing piece is arranged between any two adjacent battery cells and connected with the shells of the two adjacent battery cells.

[0006] In some embodiments of the utility model, the reinforcing piece includes a first reinforcing piece, the first reinforcing piece extends along the thickness direction of the battery cell, the first reinforcing piece is arranged on one side of the shell with the explosion-proof hole and connected with the shells of the plurality of battery cells, and the first reinforcing piece has a plurality of avoiding holes spaced apart along the thickness direction of the battery cell, and the plurality of avoiding holes are respectively and one-to-one corresponding with the explosion-proof holes of the plurality of battery cells.

[0007] In some embodiments of the utility model, the reinforcing member further comprises at least one reinforcing rib, the reinforcing rib is arranged on the side of the first reinforcing member facing the shell and is connected with the first reinforcing member, the reinforcing rib extends along the length direction of the battery cell, and the reinforcing rib is arranged between any two adjacent battery cells and is connected with the two adjacent battery cells.

[0008] In some embodiments of the utility model, the two side corners of the shell along the thickness direction of the battery cell at one end of the explosion-proof hole are rounded, and the width of the reinforcing rib is greater than the radius of the rounded corner.

[0009] In some embodiments of the utility model, the reinforcing member comprises at least one second reinforcing member, the second reinforcing member is arranged between any two adjacent battery cells and is connected with the two adjacent battery cells, and the second reinforcing member extends along the circumferential direction of the battery cell and is arranged on the edge of the battery cell.

[0010] In some embodiments of the utility model, the two side corners of the shell along the thickness direction of the battery cell at one end of the explosion-proof hole are rounded, and the width of the second reinforcing member is greater than the radius of the rounded corner.

[0011] In some embodiments of the utility model, the reinforcing member comprises: a first reinforcing member, the first reinforcing member extends along the thickness direction of the battery cell, the first reinforcing member is arranged on the side of the shell having the explosion-proof hole and is connected with the shell of the plurality of battery cells, the first reinforcing member is provided with a plurality of avoiding holes spaced apart along the thickness direction of the battery cell, and the plurality of avoiding holes are respectively and one-to-one corresponding with the explosion-proof holes of the plurality of battery cells; and a second reinforcing member, the second reinforcing member is at least one, the second reinforcing member is arranged between any two adjacent battery cells and is connected with the two adjacent battery cells, the second reinforcing member extends along the circumferential direction of the battery cell and is connected to the side of the first reinforcing member facing the battery cell.

[0012] In some embodiments of the utility model, the reinforcing member and the shell of the battery cell are adhesively connected.

[0013] In some embodiments of the utility model, the shell comprises a shell body and a boss, the boss is arranged on one end of the shell body along the width direction of the battery cell, and the explosion-proof hole penetrates through the shell body and the boss along the width direction of the battery cell.

[0014] In some embodiments of the utility model, an annular rib is arranged on the peripheral wall of the explosion-proof hole, the annular rib extends along the circumferential direction of the explosion-proof hole, the explosion-proof valve is arranged on the side of the annular rib facing the outlet of the explosion-proof hole and is connected with the annular rib.

[0015] Additional aspects and advantages of the present utility model will be partially given in the following description, some will become apparent from the following description, or will be understood by the practice of the present utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

[0017] Figure 1 is the exploded view of the battery pack according to the first embodiment of the present utility model;

[0018] Figure 2 is the partial exploded view of the battery pack according to the first embodiment of the present utility model, wherein, it indicates that the reinforcing member includes the first reinforcing member;

[0019] Figure 3 is the Figure 2 sectional view at A-A in Figure;

[0020] Figure 4 is the Figure 3 enlarged view at B in Figure;

[0021] Figure 5 is the partial exploded view of the battery pack according to the second embodiment of the present utility model, wherein, it indicates that the reinforcing member includes the first reinforcing member and the reinforcing rib;

[0022] Figure 6 is the Figure 5 enlarged view at C-C in Figure;

[0023] Figure 7 is the partial exploded view of the battery pack according to the third embodiment of the present utility model, wherein, it indicates that the reinforcing member includes the second reinforcing member;

[0024] Figure 8 is the partial exploded view of the battery pack according to the fourth embodiment of the present utility model, wherein, it indicates that the reinforcing member includes the first reinforcing member and the second reinforcing member.

[0025] REFERENCE NUMERALS:

[0026] 10, battery pack;

[0027] 1, cell;11, shell;111, shell body;112, boss;113, explosion-proof hole;114, annular rib;12, explosion-proof valve;13, pole group;14, end cover;

[0028] 2, reinforcing member;21, first reinforcing member;211, avoiding hole;22, second reinforcing member;23, reinforcing rib. DETAILED DESCRIPTION

[0029] Embodiments of the present application will be described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are for the purpose of explanation only and are not to be taken as limiting the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the features limited as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0031] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] Reference will now be made to Figures 1-8 A battery pack 10 according to an embodiment of the present application is described.

[0033] As Figures 1-8 shown, the battery pack 10 according to an embodiment of the present application comprises a plurality of battery cells 1 and a reinforcing member 2.

[0034] Specifically, referring to Figures 1-8 , the plurality of battery cells 1 are arranged along the thickness direction of the battery cell 1, the battery cell 1 comprises a shell 11 and an explosion-proof valve 12, one end of the shell 11 along the width direction of the battery cell 1 has an explosion-proof hole 113, and the explosion-proof valve 12 is arranged in the explosion-proof hole 113;

[0035] It should be noted that the shell 11 has a mounting space, and the electric core 1 further comprises: an end plate and a pole group 13, the pole group 13 is arranged in the mounting space, the two ends of the shell 11 along the length direction of the electric core 1 are open, the end cover 14 is two, and is arranged at the two ends of the shell 11 along the length direction of the electric core 1 respectively, and is used for sealing the opening of the two ends of the shell 11 along the length direction of the electric core 1. The explosion-proof hole 113 is communicated with the mounting space, and is used for discharging the gas when the electric core 1 is abnormal. The explosion-proof valve 12 has an explosion-proof notch, so that a weak area is formed at the explosion-proof valve 12. When the gas pressure in the mounting space reaches a certain value, the gas will preferentially break through the explosion-proof notch and be discharged, thereby avoiding the explosion of the electric core 1 and ensuring the safety of the electric core 1.

[0036] Further, as shown in Figures 1-6 and Figure 8 , the reinforcing member 2 is arranged on the side of the shell 11 having the explosion-proof hole 113 and is connected with the shells 11 of the plurality of electric cores 1. It can be understood that the side of the shell 11 of the plurality of electric cores 1 having the explosion-proof hole 113 can be connected, forming a whole, thereby improving the rigidity of the side of the shell 11 of the plurality of electric cores 1 having the explosion-proof hole 113, reducing the deformation of the side of the shell 11 of the plurality of electric cores 1 having the explosion-proof hole 113, reducing the deformation of the explosion-proof valve 12, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, and improving the safety of the battery pack 10.

[0037] and / or, as shown in Figure 7 , the reinforcing member 2 is arranged between any two adjacent electric cores 1, and the reinforcing member 2 is connected with the shells 11 of the two adjacent electric cores 1. Thus, the reinforcing member 2 can connect any two adjacent electric cores 1, so that all the electric cores 1 can be connected to form a whole, thereby improving the overall rigidity of the shells 11 of all the electric cores 1, reducing the deformation of the shells 11 of the electric cores 1, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, and improving the safety of the battery pack 10.

[0038] For example, in the present application, the electric core 1 is two, but the present application is not limited thereto, and the electric core 1 can also be more, such as 3, 4, 5 or 6, etc.

[0039] According to the battery pack 10 of the embodiment of the present application, the reinforcing member 2 is arranged on the side of the shell 11 having the explosion-proof hole 113 and is connected with the shells 11 of the plurality of electric cores 1, and / or the reinforcing member 2 is arranged between any two adjacent electric cores 1, and the reinforcing member 2 is connected with the shells 11 of the two adjacent electric cores 1, so that all the electric cores 1 can be connected to form a whole, thereby improving the overall rigidity of the shells 11 of all the electric cores 1, reducing the deformation of the shells 11 of the electric cores 1, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, and improving the safety of the battery pack 10.

[0040] In some embodiments of the utility model, as shown in Figures 1-4 The reinforcing member 2 includes a first reinforcing member 21 extending in the thickness direction of the battery cell 1, and the first reinforcing member 21 is arranged on the side of the shell 11 having the explosion-proof hole 113 and connected with the shells 11 of the plurality of battery cells 1. The first reinforcing member 21 has a plurality of avoiding holes 211 spaced apart in the thickness direction of the battery cell 1, and the plurality of avoiding holes 211 are arranged one-to-one corresponding to the explosion-proof holes 113 of the plurality of battery cells 1.

[0041] It can be understood that the first reinforcing member 21 extends in the thickness direction of the battery cell 1, so that the first reinforcing member 21 can cover all the battery cells 1, thereby facilitating the connection of the first reinforcing member 21 with all the shells 11 of the battery cells 1. The first reinforcing member 21 is arranged on the side of the shell 11 having the explosion-proof hole 113 and connected with the shells 11 of the plurality of battery cells 1, thereby realizing the connection of the side of the shells 11 of the plurality of battery cells 1 having the explosion-proof hole 113 to form a whole, thereby improving the rigidity of the side of the shells 11 of the plurality of battery cells 1 having the explosion-proof hole 113, reducing the deformation of the side of the shells 11 of the plurality of battery cells 1 having the explosion-proof hole 113, reducing the deformation of the explosion-proof valve 12, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, and improving the safety of the battery pack 10.

[0042] Further, the first reinforcing member 21 is provided with the avoiding hole 211, and the avoiding hole 211 is arranged opposite to the explosion-proof hole 113, thereby avoiding blocking the discharge of gas and ensuring the safety of the battery pack 10.

[0043] In some embodiments of the utility model, as shown in Figure 5 and Figure 6 The reinforcing member 2 further includes at least one reinforcing rib 23 arranged on the side of the first reinforcing member 21 facing the shell 11 and connected with the first reinforcing member 21. The reinforcing rib 23 extends in the length direction of the battery cell 1, and the reinforcing rib 23 is arranged between any two adjacent battery cells 1 and connected with the two adjacent battery cells 1. It should be noted that the number of reinforcing ribs 23 is one less than the number of battery cells 1. When the number of battery cells 1 is two, the number of reinforcing ribs 23 is one. When the number of battery cells 1 is greater than two, the number of reinforcing ribs 23 is a plurality of reinforcing ribs 23 spaced apart in the thickness direction of the battery cell 1.

[0044] It can be understood that the reinforcing rib 23 is arranged between the gaps between the two adjacent battery cells 1, and the reinforcing rib 23 is connected with the two adjacent battery cells 1, so that, on the one hand, the two adjacent battery cells 1 can be connected through the first reinforcing piece 21, and on the other hand, the two adjacent battery cells 1 can also be connected through the reinforcing rib 23, thereby further improving the connection reliability between the plurality of battery cells 1, improving the integrity, thereby further improving the overall rigidity of the shell 11 of all the battery cells 1, reducing the deformation of the shell 11 of the battery cell 1, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, and improving the safety of the battery pack 10.

[0045] In some embodiments of the utility model, as shown in Figure 5 and Figure 6 The shell 11 has two side corners of the end of the explosion-proof hole 113 in the thickness direction of the battery cell 1 are rounded, and the width (width in the width direction of the battery cell 1) of the reinforcing rib 23 is greater than the radius of the rounded corner. Among them, the rounded corner can be a rounded corner recessed into the mounting space, or a rounded corner protruding away from the mounting space. Since the reinforcing rib 23 is not easy to connect with the rounded corner of the shell 11, the width of the reinforcing rib 23 is greater than the radius of the rounded corner, thereby facilitating the connection of the reinforcing rib 23 and the shell 11, thereby improving the connection reliability of the reinforcing rib 23 and the shell 11. Among them, the reinforcing rib 23 and the shell 11 are connected by welding or bonding.

[0046] In some embodiments of the utility model, as shown in Figure 7 The reinforcing piece 2 includes at least one second reinforcing piece 22, and one second reinforcing piece 22 is arranged between any two adjacent battery cells 1, the second reinforcing piece 22 is connected with the two adjacent battery cells 1, and the second reinforcing piece 22 is arranged at the edge of the battery cell 1 and extends in the circumferential direction of the battery cell 1. Among them, it needs to be explained that the number of the second reinforcing piece 22 is one less than the number of the battery cell 1, when the battery cell 1 is two, the second reinforcing piece 22 is one, when the number of the second reinforcing piece 22 is more than two, the second reinforcing piece 22 is a plurality of reinforcing pieces spaced apart in the thickness direction of the battery cell 1.

[0047] It can be understood that the second reinforcing piece 22 is arranged between the gaps between the two adjacent battery cells 1, and the second reinforcing piece 22 is connected with the two adjacent battery cells 1, so that the shell 11 of the two adjacent battery cells 1 is connected, so that all the battery cells 1 can be connected to form a whole, thereby improving the overall rigidity of the shell 11 of all the battery cells 1, reducing the deformation of the shell 11 of the battery cell 1, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, and improving the safety of the battery pack 10.

[0048] Further, as shown in Figure 7As shown, the second reinforcing member 22 is arranged at the edge of the battery cell 1 and extends along the circumferential direction of the battery cell 1, wherein the circumferential direction of the battery cell 1 refers to the circumferential direction of the surface perpendicular to the thickness direction of the battery cell 1. The second reinforcing member 22 extends along the circumferential direction of the battery cell 1, thereby increasing the connection area between the second reinforcing member 22 and the adjacent battery cell 1, further improving the connection reliability between the second reinforcing member 22 and the adjacent battery cell 1, improving the connection reliability between the shells 11 of the second adjacent battery cells 1, further improving the integrity, further improving the overall rigidity of the shells 11 of all battery cells 1, reducing the deformation of the shells 11 of the battery cells 1, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, and improving the safety of the battery pack 10.

[0049] In some embodiments of the present application, as shown in Figure 7 As shown, the shell 11 has rounded corners on both sides of the explosion-proof hole 113 in the thickness direction of the battery cell 1, and the width (width in the width direction of the battery cell 1) of the second reinforcing member 22 is greater than the radius of the rounded corner. It can be understood that the rounded corner can be a rounded corner recessed into the mounting space, or a rounded corner protruding away from the mounting space. Since the second reinforcing member 22 is not easy to connect at the rounded corner of the shell 11, the width of the second reinforcing member 22 is greater than the radius of the rounded corner, thereby facilitating the connection of the second reinforcing member 22 and the shell 11, and improving the connection reliability of the second reinforcing member 22 and the shell 11.

[0050] In some embodiments of the present application, as shown in Figure 8 As shown, the reinforcing member 2 comprises: a first reinforcing member 21 and a second reinforcing member 22. The first reinforcing member 21 extends along the thickness direction of the battery cell 1, and the first reinforcing member 21 is arranged on one side of the shell 11 having the explosion-proof hole 113 and connected to the shells 11 of the plurality of battery cells 1. The first reinforcing member 21 has a plurality of avoiding holes 211 spaced apart along the thickness direction of the battery cell 1, and the plurality of avoiding holes 211 are respectively arranged one-to-one corresponding to the explosion-proof holes 113 of the plurality of battery cells 1; the second reinforcing member 22 is at least one, and the second reinforcing member 22 is arranged between any two adjacent battery cells 1, and the second reinforcing member 22 is connected to the two adjacent battery cells 1. The second reinforcing member 22 extends along the circumferential direction of the battery cell 1 and is connected to the side of the first reinforcing member 21 facing the battery cell 1.

[0051] It can be understood that the arrangement of the first reinforcing member 21 allows the side of the shell 11 of the plurality of battery cells 1 having the explosion-proof hole 113 to be connected together to form a whole, thereby improving the rigidity of the side of the shell 11 of the plurality of battery cells 1 having the explosion-proof hole 113, reducing the deformation of the side of the shell 11 of the plurality of battery cells 1 having the explosion-proof hole 113, reducing the deformation of the explosion-proof valve 12, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, and improving the safety of the battery pack 10.

[0052] And the second reinforcing member 22 is arranged so that the sides of the adjacent cell 1 shell 11 along the thickness direction of the cell 1 towards each other can be connected, so that the plurality of cells 1 can be connected in the thickness direction of the cell 1 to form a whole, improve the overall stiffness of the plurality of cell 1 shell 11, reduce the deformation of the plurality of cell 1 shell 11, reduce the deformation of the explosion-proof valve 12, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, improving the safety of the battery pack 10.

[0053] Therefore, through the mutual combination of the first reinforcing member 21 and the second reinforcing member 22, on the one hand, the sides of the plurality of cell 1 shell 11 having the explosion-proof hole 113 can be connected to form a whole, and on the other hand, the plurality of cells 1 can be connected in the thickness direction of the cell 1 to form a whole. Thus, the overall stiffness of the plurality of cell 1 shell 11 is further improved, the deformation of the cell 1 shell 11 is reduced, the deformation of the explosion-proof valve 12 is reduced, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, improving the safety of the battery pack 10.

[0054] In some embodiments of the present application, the reinforcing member 2 and the shell 11 of the cell 1 are adhesively connected. Therefore, the connection reliability between the reinforcing member 2 and the shell 11 of the cell 1 is improved, thereby further improving the overall stiffness of the plurality of cell 1 shell 11, reducing the deformation of the cell 1 shell 11, reducing the deformation of the explosion-proof valve 12, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, improving the safety of the battery pack 10.

[0055] In some embodiments of the present application, as shown in Figures 1-4 The shell 11 includes a shell body 111 and a boss 112, the boss 112 is arranged at one end of the shell body 111 along the width direction of the cell 1, and the explosion-proof hole 113 penetrates the shell body 111 and the boss 112 along the width direction of the cell 1. It can be understood that the explosion-proof valve 12 is arranged in the explosion-proof hole 113 corresponding to the boss 112, and thus the wall surface of the boss 112 can form protection for the explosion-proof valve 12, thereby reducing the influence of the deformation of the shell body 111 on the explosion-proof valve 12, further reducing the deformation of the explosion-proof valve 12, thereby reducing the risk of cracking of the weak area of the explosion-proof valve 12, improving the safety of the battery pack 10.

[0056] In some embodiments of the present application, as shown in Figures 1-4 The circumferential wall of the explosion-proof hole 113 is provided with an annular rib 114, the annular rib 114 extends along the circumferential direction of the explosion-proof hole 113, the explosion-proof valve 12 is arranged on the side of the annular rib 114 facing the outlet of the explosion-proof hole 113, and is connected with the annular rib 114.

[0057] It can be understood that the explosion-proof hole 113 outlet is used for gas exhaust, the annular rib 114 is connected with the explosion-proof valve 12, the explosion-proof valve 12 can be supported, and the installation stability and reliability of the explosion-proof valve 12 in the explosion-proof hole 113 are improved. Further, the thickness of the annular rib 114 along the width direction of the battery cell 1 is less than the thickness of the shell body 111, so that when the internal gas pressure of the shell 11 is too large (in an extreme case), the annular rib 114 can be broken by the gas, thereby improving the exhaust efficiency and further ensuring the safety of the battery pack 10.

[0058] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like 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 application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A plurality of battery cells, wherein the plurality of battery cells are arranged along the thickness direction of the battery cells, the battery cells comprising a shell and an explosion-proof valve, wherein one end of the shell along the width direction of the battery cells has an explosion-proof hole, and the explosion-proof valve is disposed in the explosion-proof hole; A reinforcement member is provided on the side of the shell having the explosion-proof hole and is connected to the shells of the plurality of battery cells, and / or a reinforcement member is provided between any two adjacent battery cells, and the reinforcement member is connected to the shells of the two adjacent battery cells.

2. The battery pack according to claim 1, wherein: The reinforcement includes a first reinforcement, which extends along the thickness direction of the battery cell. The first reinforcement is arranged on the side of the shell having the explosion-proof hole and is connected to the shells of the multiple battery cells. The first reinforcement has a plurality of avoidance holes spaced apart along the thickness direction of the battery cell, and the plurality of avoidance holes are respectively arranged in one-to-one correspondence with the explosion-proof holes of the multiple battery cells.

3. The battery pack according to claim 2, wherein: The reinforcement member also includes at least one reinforcement rib, which is arranged on the side of the first reinforcement member facing the shell and connected to the first reinforcement member. The reinforcement rib extends along the length direction of the battery cell. The reinforcement rib is provided between any two adjacent battery cells, and the reinforcement rib is connected to two adjacent battery cells.

4. The battery pack according to claim 3, characterized in that: The shell has rounded corners on both sides of one end of the explosion-proof hole along the thickness direction of the battery core, and the width of the reinforcing rib is greater than the radius of the rounded corners.

5. The battery pack according to claim 1, wherein: The reinforcement includes at least one second reinforcement, and the second reinforcement is provided between any two adjacent battery cells. The second reinforcement is connected to the two adjacent battery cells, and the second reinforcement is provided at the edge of the battery cell and extends along the circumferential direction of the battery cell.

6. The battery pack according to claim 5, characterized in that: The shell has rounded corners on both sides of one end of the explosion-proof hole along the thickness direction of the battery core, and the width of the second reinforcement is greater than the radius of the rounded corners.

7. The battery pack according to claim 1, wherein: The reinforcement comprises: a first reinforcement member extending along the thickness direction of the battery cell, the first reinforcement member being provided on a side of the shell having the explosion-proof hole and connected to the shells of the plurality of battery cells, the first reinforcement member having a plurality of avoidance holes spaced apart along the thickness direction of the battery cell, the plurality of avoidance holes being provided in a one-to-one correspondence with the explosion-proof holes of the plurality of battery cells; A second reinforcement member, there is at least one second reinforcement member, and the second reinforcement member is provided between any two adjacent battery cells. The second reinforcement member is connected to the two adjacent battery cells, and the second reinforcement member extends along the circumferential direction of the battery cell and is connected to the side of the first reinforcement member facing the battery cell.

8. The battery pack according to claim 1, wherein: The reinforcement is bonded to the shell of the battery cell.

9. The battery pack according to claim 1, wherein: The shell includes a shell body and a boss, the boss is provided at one end of the shell body along the width direction of the battery core, and the explosion-proof hole passes through the shell body and the boss along the width direction of the battery core.

10. The battery pack according to claim 9, characterized in that: An annular rib is provided on the peripheral wall of the explosion-proof hole, and the annular rib extends along the circumferential direction of the explosion-proof hole. The explosion-proof valve is provided on a side of the annular rib facing the outlet of the explosion-proof hole and is connected to the annular rib.

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