Battery cell module, battery pack and energy storage equipment

Abstract

The invention relates to a battery cell module, a battery pack and energy storage equipment. The battery cell module comprises a first end wall, a second end wall, a battery cell assembly, a first circuit board and a first fastener, the first end wall comprises a first base part and a first convex part which are connected, a first fixing hole is formed in the first end wall, and at least part of the first fixing hole is located in the first convex part. In the first direction, the battery cell assembly is located between the first end wall and the second end wall. The battery cell assembly comprises a plurality of battery cells, and the battery cells are provided with electrode terminals. The electrode terminal is connected to the first circuit board, the first circuit board is provided with a first connecting hole, the first convex part is located in the first connecting hole, and the first convex part is configured to move in the first connecting hole. The first fastener comprises a first fastening part fixed in the first fixing hole and a first limiting part located outside the first fixing hole, and a part of the first circuit board is located between the first limiting part and the first base part.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell module, a battery pack and an energy storage device. Background Art

[0002] As the power source of energy storage equipment, the battery pack is the key to ensure the normal use of energy storage equipment. The battery pack includes a shell and a battery cell module arranged in the shell. The battery cell module includes a battery cell assembly and a circuit board. During the assembly and production process of the battery pack, adhesive is usually used to fix the circuit board to the electrode assembly or the shell. However, as the battery pack is used for a longer time, the battery cell module will inevitably fail and parts such as the battery cell assembly or the circuit board need to be repaired or replaced. The method of fixing the circuit board to the electrode assembly or the shell with adhesive makes it difficult to disassemble the circuit board or the electrode assembly, which brings inconvenience to the repair or replacement of parts of the battery pack. Summary of the invention

[0003] The purpose of the present application is to provide a battery cell module, a battery pack and an energy storage device, aiming to improve the convenience of repairing or replacing parts of the battery pack.

[0004] According to a first aspect of the present application, a battery cell module is provided, comprising a first end wall, a second end wall, a battery cell assembly, a first circuit board and a first fastener. The first end wall comprises a first base and a first protrusion connected to each other, the first end wall is provided with a first fixing hole, and at least a portion of the first fixing hole is located at the first protrusion. Along a first direction, the battery cell assembly is located between the first end wall and the second end wall. The battery cell assembly comprises a plurality of battery cells, and the battery cells are provided with electrode terminals. The electrode terminals are connected to a first circuit board, the first circuit board is provided with a first connection hole, the first protrusion is located in the first connection hole, and the first protrusion is configured to move in the first connection hole. The first fastener comprises a first fastening portion fixed to the first fixing hole and a first limiting portion located outside the first fixing hole, and a portion of the first circuit board is located between the first limiting portion and the first base.

[0005] In any one or more optional embodiments, along the third direction, there is a first gap between the first protrusion and the first connecting hole, the length of the first gap does not exceed 1 mm, and the third direction is perpendicular to the first direction.

[0006] In any one or more optional embodiments, along the first direction, there is a second gap between the first protrusion and the first connecting hole, and the length of the second gap does not exceed 1 mm.

[0007] In any one or more optional embodiments, along the second direction, the thickness of the portion of the first circuit board located between the first limiting portion and the first base is D1, the distance between the first limiting portion and the first base is L1, L1 is greater than D1, and the second direction is perpendicular to the first direction.

[0008] In any one or more optional embodiments, L1-D1≤1 mm.

[0009] In any one or more optional embodiments, the second end wall includes a second base and a second protrusion connected to each other, the first circuit board is provided with a first notch, the first notch is away from the first end wall in a first direction, a portion of the second protrusion is located in the first notch, and in a third direction, the second protrusion is configured to move in the first notch. The second end wall is provided with a second fixing hole, at least a portion of the second fixing hole is located in the second protrusion, the battery module includes a second fastener, the second fastener includes a second fastening portion fixed to the second fixing hole and a second limiting portion located outside the second fixing hole, and a portion of the first circuit board is located between the second limiting portion and the second base.

[0010] In any one or more optional embodiments, along the third direction, there is a fifth gap between the second protrusion and the first notch, and the length of the fifth gap does not exceed 1 mm.

[0011] In any one or more optional embodiments, along the second direction, the thickness of the portion of the first circuit board located between the second limiting portion and the second base is D2, the distance between the second limiting portion and the second base is L2, L2 is greater than D2, and the second direction is perpendicular to the first direction.

[0012] In any one or more optional embodiments, L2-D2≤1 mm.

[0013] In any one or more optional embodiments, the first end wall includes a third protrusion connected to the first base, the first protrusion and the third protrusion are arranged at intervals along a third direction, the third direction is perpendicular to the first direction, the first circuit board is provided with a first welding portion connected to the electrode terminal, and along the first direction, the projection of the first welding portion is located between the first protrusion and the third protrusion. The first circuit board is provided with a second connection hole, the third protrusion is located in the second connection hole, and the third protrusion is configured to move in the second connection hole. The first end wall is provided with a third fixing hole, and at least a portion of the third fixing hole is located in the third protrusion. The battery module includes a third fastener, and the third fastener includes a third fastening portion fixed to the third fixing hole and a third limiting portion located outside the third fixing hole, and a portion of the first circuit board is located between the third limiting portion and the first base.

[0014] In any one or more optional embodiments, the electrode terminals of adjacent cells are stacked and connected to form a connection area so that the cells are connected in series or in parallel. At least part of the projection of the connection area along the third direction is separated from the projection of the first circuit board along the third direction.

[0015] In any one or more optional embodiments, along the third direction, there is a third gap between the third protrusion and the second connecting hole, and the length of the third gap does not exceed 2 mm and is greater than the length of the first gap between the first protrusion and the first connecting hole.

[0016] In any one or more optional embodiments, along the first direction, there is a fourth gap between the third protrusion and the second connecting hole, and the length of the fourth gap does not exceed 2 mm and is greater than the length of the second gap between the first protrusion and the first connecting hole.

[0017] In any one or more optional embodiments, along the second direction, the thickness of the portion of the first circuit board located between the third limiting portion and the first base is D3, the distance between the third limiting portion and the first base is L3, L3 is greater than D3, and the second direction, the first direction and the third direction are perpendicular to each other.

[0018] In any one or more optional embodiments, L3-D3≤1 mm.

[0019] In any one or more optional embodiments, a plurality of battery cells are arranged in a first direction, and electrode terminals of adjacent battery cells are stacked and welded to the first circuit board. The battery cell module includes buffers disposed on adjacent battery cells.

[0020] In any one or more optional embodiments, the battery cell comprises a soft-pack battery cell.

[0021] In any one or more optional embodiments, the battery cell module includes a first fixing member, which is arranged around the outer side of the first end wall and the outer side of the second end wall, and fixes the first end wall, the second end wall and the battery cell assembly.

[0022] According to a second aspect of the present application, a battery pack is provided, comprising a shell and a battery cell module as described above, wherein the shell is provided with a receiving cavity, and the battery cell module is located in the receiving cavity.

[0023] According to a third aspect of the present application, there is provided an energy storage device comprising at least one battery pack as described above.

[0024] The battery cell module involved in the present application has a battery cell assembly located between a first end wall and a second end wall, and a first circuit board is fixed to a first fixing hole by a first fastener, so that the assembly and disassembly of the first circuit board and the battery cell assembly are more convenient. The first protrusion is located in the first connection hole, and the first protrusion is configured to move in the first connection hole, which can improve the influence of stress on the first circuit board during the installation, transportation and use of the battery pack.

[0025] Additional aspects and advantages of the embodiments of the present application will be described, shown, or explained in part in the subsequent description through implementation of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the dimensions in the drawings do not constitute proportional limitations.

[0027] Figure 1 A schematic diagram of the structure of a battery pack according to some embodiments of the present application;

[0028] Figure 2 An exploded view of a battery pack according to some embodiments of the present application;

[0029] Figure 3 It is a schematic diagram of assembling a portion of a housing and a battery cell module in some embodiments of the present application;

[0030] Figure 4 This is a schematic diagram of the battery module structure of some embodiments of the present application;

[0031] Figure 5 A schematic diagram of the structure of the first end wall of some embodiments of the present application;

[0032] Figure 6 A schematic diagram of the structure of a first circuit board in some embodiments of the present application;

[0033] Figure 7 It is a schematic diagram of assembling the first end wall, the first circuit board and the first fastener in some embodiments of the present application;

[0034] Figure 8 An exploded view of a battery cell assembly according to some embodiments of the present application;

[0035] Fig. 9 A simple schematic diagram of the first protrusion (third protrusion) and the first connecting hole (second connecting hole) of some embodiments of the present application;

[0036] Fig.10 A simple schematic diagram of the first protrusion (third protrusion) and the first connecting hole (second connecting hole) of some embodiments of the present application;

[0037] Fig.11 for Figure 7 Enlarged view of part A in the middle;

[0038] Fig.12 This is a schematic structural diagram of the second end wall of some embodiments of the present application;

[0039] Fig.13 It is a schematic diagram of assembling the second end wall, the first circuit board and the second fastener in some embodiments of the present application;

[0040] Fig.14 A schematic diagram of the positions of the second protrusion and the first notch in some embodiments of the present application;

[0041] Fig.15 for Fig.13 Enlarged view of middle part B;

[0042] Fig.16 It is a schematic diagram of assembling the first end wall, the first circuit board and the third fastener in some embodiments of the present application;

[0043] Fig.17 for Fig.16 Enlarged view of middle C;

[0044] Fig.18 This is a schematic diagram of assembling a first circuit board and a battery cell assembly according to some embodiments of the present application;

[0045] Fig.19 It is a schematic diagram of the assembly of the first end wall, the second end wall, the battery cell assembly, the first fixing member and the second fixing member in some embodiments of the present application;

[0046] Fig. 20 An exploded view of a bottom wall, a fourth fastener, a fifth fastener, a sixth fastener, and a seventh fastener according to some embodiments of the present application;

[0047] Fig.21 This is a schematic diagram of the structure of the energy storage device of some embodiments of the present application.

[0048] Description of reference numerals:

[0049] 1000. Energy storage equipment;

[0050] 100. Battery pack;

[0051] 10. Shell; 10a. Accommodating chamber; 11. Top cover; 12. Bottom wall; 13. First side wall; 14. Second side wall; 15. Third side wall; 16. Fourth side wall;

[0052] 20. Battery cell module;

[0053] 21. battery cell assembly; 211. battery cell; 212. electrode terminal; 212a. connection area; 213. buffer;

[0054] 22. First end wall; 221. First base; 222. First convex portion; 223. First fixing hole; 224. Third convex portion; 225. Third fixing hole; 226. First hole; 227. Fifth hole;

[0055] 23, second end wall; 231, second base; 232, second convex portion; 233, second fixing hole; 234, second hole; 235, sixth hole;

[0056] 24, first circuit board; 241, first connection hole; 241a, first gap; 241b, second gap; 242, first notch; 242a, fifth gap; 243, second connection hole; 243a, third gap; 243b, fourth gap; 244, first welding part;

[0057] 251, first fastener; 2511, first fastening portion; 2512, first limiting portion; 252, second fastener; 2521, second fastening portion; 2522, second limiting portion; 253, third fastener; 2531, third fastening portion; 2532, third limiting portion; 254, fourth fastener; 255, fifth fastener; 256, sixth fastener; 257, seventh fastener;

[0058] 261, fourth convex portion; 2611, third hole; 262, fifth convex portion; 2621, fourth hole; 263, sixth convex portion; 2631, seventh hole; 264, seventh convex portion; 2641, eighth hole;

[0059] 27. A second circuit board;

[0060] 281. bracket; 282. third circuit board;

[0061] 291, first fixing member; 292, second fixing member;

[0062] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0064] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0065] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0066] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", etc. 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 direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two components. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0067] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0068] The technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0069] In the assembly process of existing battery packs, adhesive is usually used to fix the circuit board to the electrode assembly or the shell. However, as the battery pack is used for a longer time, the battery cell module will inevitably fail and the battery cell assembly or circuit board and other parts need to be repaired or replaced. The method of fixing the circuit board to the electrode assembly or the shell with adhesive makes it difficult to remove the circuit board or the electrode assembly, which brings inconvenience to the repair or replacement of parts of the battery pack.

[0070] In order to solve the above problems, the present application provides a battery cell module, a battery pack and an energy storage device, which can improve the convenience of repairing or replacing parts of the battery pack.

[0071] The specific structure and function of the battery cell module, battery pack and energy storage device provided by the present application are described in detail below. In which, in the first direction X, it includes the first direction X and the direction opposite to the first direction X, in the second direction Y, it includes the second direction Y and the direction opposite to the second direction Y, and in the third direction Z, it includes the third direction Z and the direction opposite to the third direction Z.

[0072] In a first aspect, an embodiment of the present application provides a battery pack 100, please refer to Figures 1 to 3 The battery pack 100 includes a shell 10 and a battery cell module 20. The shell 10 is provided with a receiving cavity 10a, and the battery cell module 20 is located in the receiving cavity 10a.

[0073] In some embodiments, please refer to Figures 4 to 7The battery cell module 20 includes a first end wall 22, a second end wall 23 and a battery cell assembly 21. Along the first direction X, the battery cell assembly 21 is located between the first end wall 22 and the second end wall 23. The first end wall 22 and the second end wall 23 fix the battery cell assembly 21. The battery cell assembly 21 includes a plurality of battery cells 211, and the battery cells 211 are provided with electrode terminals 212.

[0074] In some embodiments, the battery cell module 20 includes a first circuit board 24, the first end wall 22 includes a first base 221 and a first protrusion 222 connected to each other, the first end wall 22 is provided with a first fixing hole 223, at least part of the first fixing hole 223 is located at the first protrusion 222, and the first circuit board 24 is connected to the electrode terminal 212 to collect and transfer the current of the battery cell 211 to an external electrical device. The first circuit board 24 is provided with a first connection hole 241, the first protrusion 222 is located in the first connection hole 241, and the first protrusion 222 is configured to move in the first connection hole 241.

[0075] In some embodiments, the battery cell module 20 includes a first fastener 251, the first fastener 251 includes a first fastening portion 2511 fixed to the first fixing hole 223 and a first limiting portion 2512 located outside the first fixing hole 223, and a portion of the first circuit board 24 is located between the first limiting portion 2512 and the first base 221.

[0076] The first circuit board 24 is fixed to the first fixing hole 223 by the first fastener 251, so that the assembly and disassembly of the first circuit board 24 and the battery cell assembly 21 are more convenient. The first protrusion 222 is located in the first connection hole 241, and the first protrusion 222 is configured to move in the first connection hole 241, which can improve the influence of stress on the first circuit board 24 during the installation, transportation and use of the battery pack 100.

[0077] In some embodiments, the first fastener 251 may be a screw or a bolt, and the first fixing hole 223 may be a threaded hole.

[0078] In some embodiments, please refer to Figure 4 and Figure 8 The plurality of battery cells 211 are arranged along the first direction X, and the electrode terminals 212 of adjacent battery cells 211 are stacked and welded to the first circuit board 24 .

[0079] In some embodiments, the battery cell module 20 includes a buffer 213 disposed on adjacent battery cells 211 . The buffer 213 is configured to provide expansion space for the battery cells 211 . The buffer 213 is compressed during the expansion of the battery cells 211 .

[0080] In some embodiments, the battery cell 211 includes a soft pack battery cell.

[0081] In some embodiments, the buffer 213 may be compressed foam.

[0082] In some embodiments, please refer to Figure 7 and Fig. 9 , Fig. 9 2 is a simple schematic diagram of the first protrusion 222 in the first connection hole 241. Along the third direction Z, there is a first gap 241a between the first protrusion 222 and the first connection hole 241, and the length T1 of the first gap 241a does not exceed 1mm, so as to improve the convenience of installation between the first protrusion 222 and the first connection hole 241. The third direction Z is perpendicular to the first direction X. In the third direction Z, the first protrusion 222 can move in the first connection hole 241.

[0083] In some embodiments, please refer to Figure 7 and Fig.10 , Fig.10 2 is a simple schematic diagram of the first protrusion 222 in the first connection hole 241. Along the first direction X, there is a second gap 241b between the first protrusion 222 and the first connection hole 241, and the length T2 of the second gap 241b does not exceed 1mm, so as to improve the convenience of installation between the first protrusion 222 and the first connection hole 241. In the first direction X, the first protrusion 222 can move in the first connection hole 241.

[0084] In some embodiments, please refer to Figure 7 and Fig.11 , along the second direction Y, the thickness of the portion of the first circuit board 24 between the first limiting portion 2512 and the first base 221 is D1, and the distance between the first limiting portion 2512 and the first base 221 is L1, which is greater than D1, so as to improve the influence of stress on the first circuit board 24 during the installation, transportation and use of the battery pack 100. The second direction Y, the first direction X and the third direction Z are perpendicular to each other.

[0085] In some embodiments, L1 - D1 ≤ 1 mm, so as to reduce the possibility of damage caused by collision between the first circuit board 24 and the first fastener 251 , the first end wall 22 and other components.

[0086] In some embodiments, please refer to Figure 4 , Figure 6 , Fig.12 and Fig.13 The second end wall 23 includes a second base 231 and a second protrusion 232 connected to each other. The first circuit board 24 is provided with a first notch 242. The first notch 242 is away from the first end wall 22 along the first direction X. A portion of the second protrusion 232 is located in the first notch 242. In the third direction Z, the second protrusion 232 is configured to move within the first notch 242.

[0087] The second end wall 23 is provided with a second fixing hole 233, at least a portion of the second fixing hole 233 is located at the second protrusion 232, the battery cell module 20 includes a second fastener 252, the second fastener 252 includes a second fastening portion 2521 fixed to the second fixing hole 233 and a second limiting portion 2522 located outside the second fixing hole 233, and a portion of the first circuit board 24 is located between the second limiting portion 2522 and the second base 231.

[0088] Combined with the first fastener 251 and the second fastener 252, the first circuit board 24 can be more firmly fixed to the battery cell assembly 21. During actual use, the battery cell assembly 21 may expand. At this time, the first end wall 22 and the second end wall 23 will move relative to each other in the first direction X, and the first circuit board 24 will move with the first end wall 22. The second protrusion 232 can move along the first notch 242, thereby reducing the possibility of the first circuit board 24 being damaged by the stress generated by the relative movement of the first end wall 22 and the second end wall 23.

[0089] In some embodiments, the second fastener 252 may be a screw or a bolt, and the second fixing hole 233 may be a threaded hole.

[0090] In some embodiments, please refer to Fig.13 and Fig.14 , Fig.14 2 is a simple schematic diagram of the second protrusion 232 in the first notch 242. Along the third direction Z, there is a fifth gap 242a between the second protrusion 232 and the first notch 242, and the length T5 of the fifth gap 242a does not exceed 1mm to improve the convenience of installation between the second protrusion 232 and the first notch 242.

[0091] In some embodiments, please refer to Fig.13 and Fig.15 , along the second direction Y, the thickness of the portion of the first circuit board 24 between the second limit portion 2522 and the second base 231 is D2, and the distance between the second limit portion 2522 and the second base 231 is L2, which is greater than D2. This is to improve the influence of stress on the first circuit board 24 during the installation, transportation and use of the battery pack 100.

[0092] In some embodiments, L2 - D2 ≤ 1 mm, so as to reduce the possibility of damage caused by collision between the first circuit board 24 and the second fastener 252 , the second end wall 23 and other components.

[0093] In some embodiments, please refer to Figures 4 to 6 as well as Fig.16The first end wall 22 includes a third protrusion 224 connected to the first base 221, and the first protrusion 222 and the third protrusion 224 are arranged at intervals along the third direction Z. The first circuit board 24 is provided with a first welding portion 244 connected to the electrode terminal 212, and along the first direction X, the projection of the first welding portion 244 is located between the first protrusion 222 and the third protrusion 224 to improve the stability of the first welding portion 244.

[0094] In some embodiments, the first circuit board 24 is provided with a second connection hole 243, the third protrusion 224 is located in the second connection hole 243, and the third protrusion 224 is configured to move in the second connection hole 243. The first end wall 22 is provided with a third fixing hole 225, at least part of the third fixing hole 225 is located in the third protrusion 224, the battery module 20 includes a third fastener 253, the third fastener 253 includes a third fastening portion 2531 fixed to the third fixing hole 225 and a third limiting portion 2532 located outside the third fixing hole 225, and part of the first circuit board 24 is located between the third limiting portion 2532 and the first base 221.

[0095] In some embodiments, the electrode terminals 212 of adjacent battery cells 211 are stacked and connected to form a connection area 212a, so that the battery cells 211 are connected in series or in parallel. At least part of the projection of the connection area 212a along the third direction Z is separated from the projection of the first circuit board 24 along the third direction Z. The first circuit board 24 is cut off to reduce costs. The first fastener 251, the second fastener 252 and the third fastener 253 are used to position the three positions of the first circuit board 24, which can improve the stability of the installation of the first circuit board 24 and the battery cell assembly 21. In some embodiments, the third fastener 253 can be a screw or a bolt, and the third fixing hole 225 can be a threaded hole.

[0096] In some embodiments, the first soldering portion 244 may be a conductive sheet, such as a copper sheet, disposed on the first circuit board 24 , and the conductive sheet is soldered to the first circuit board. In other embodiments, the first soldering portion 244 may be a copper foil disposed on the first circuit board 24 .

[0097] In some embodiments, please refer to Fig. 9 and Fig.16 , Fig. 9It is a simple schematic diagram of the third protrusion 224 in the second connection hole 243. Along the third direction Z, there is a third gap 243a between the third protrusion 224 and the second connection hole 243. The length T3 of the third gap 243a does not exceed 2mm and is greater than the length T1 of the first gap 241a. When assembling, the first fastener 251 can be set first, the first circuit board 24 and the first end wall 22 are initially positioned, and then the second fastener 252 is set, the first circuit board 24 and the second end wall 23 are fixed, and finally the third fastener 253 is set. The third protrusion 224 and the second connection hole 243 can be installed after the second protrusion 232 and the first protrusion 222 to better accommodate the installation size tolerance.

[0098] In some embodiments, please refer to Fig.10 and Fig.16 , Fig.10 It is a simple schematic diagram of the third protrusion 224 in the second connection hole 243. Along the first direction X, there is a fourth gap 243b between the third protrusion 224 and the second connection hole 243, and the length T4 of the fourth gap 243b does not exceed 2mm and is greater than the length T2 of the second gap 241b to better accommodate the installation dimension tolerance.

[0099] In some embodiments, please refer to Fig.16 and Fig.17 Along the second direction Y, the thickness of the first circuit board 24 between the third limiting portion 2532 and the first base 221 is D3, and the distance between the third limiting portion 2532 and the first base 221 is L3. L3 is greater than D3, which can improve the influence of stress on the first circuit board 24 during the installation, transportation and use of the battery pack 100.

[0100] In some embodiments, L3 - D3 ≤ 1 mm, so as to reduce the possibility of damage caused by collision between the first circuit board 24 and the third fastener 253 , the first end wall 22 and other components.

[0101] In some embodiments, please refer to Figure 4 The battery module 20 includes a second circuit board 27, which is fixed to the first end wall 22 and the second end wall 23. Along the second direction Y, the second circuit board 27 and the first circuit board 24 are spaced apart, and the second circuit board 27 is connected to the battery assembly 21.

[0102] In some embodiments, please refer to Fig.19 The battery cell module 20 includes a first fixing member 291 , which is disposed around the outer side of the first end wall 22 and the outer side of the second end wall 23 to fix the first end wall 22 , the battery cell assembly 21 and the second end wall 23 .

[0103] In some embodiments, the battery module 20 includes a second fixing member 292, which is spaced apart from the first fixing member 291 along the second direction Y. The second fixing member 292 is disposed around the outer side of the first end wall 22 and the outer side of the second end wall 23 to further fix the first end wall 22, the battery assembly 21 and the second end wall 23. When the battery cell 211 expands more severely, the first fixing member 291 and the second fixing member 292 will be broken or stretched, and the first circuit board 24 will be separated from the second end wall 23 through the first notch 242. At this time, the first end wall 22 can fix the first circuit board 24, reducing the possibility of the first circuit board 24 causing short circuits in other batteries 211 due to disordered movement.

[0104] In some embodiments, the first fixing member 291 may be a steel belt, a flame retardant tape or other strapping tape, and the second fixing member 292 may also be a steel belt, a flame retardant tape or other strapping tape.

[0105] In some embodiments, please refer to Figures 1 to 3 The housing 10 includes a top cover 11, a bottom wall 12, a first side wall 13, a second side wall 14, a third side wall 15 and a fourth side wall 16. The bottom wall 12, the first side wall 13, the second side wall 14, the third side wall 15 and the fourth side wall 16 are enclosed together to form the above-mentioned accommodating cavity 10a, and the top cover 11 is detachably covered with the accommodating cavity 10a, wherein the bottom wall 12 and the top cover 11 are arranged opposite to each other along the third direction Z, the first side wall 13 and the third side wall 15 are arranged opposite to each other along the second direction Y, and the second side wall 14 and the fourth side wall 16 are arranged opposite to each other along the first direction X.

[0106] In some embodiments, please refer to Figures 19 to 20 The bottom wall 12 is provided with a fourth protrusion 261 and a fifth protrusion 262. Along the third direction Z, the first end wall 22 is provided at the fourth protrusion 261, and the second end wall 23 is provided at the fifth protrusion 262. The first end wall 22 is provided with a first hole 226, the second end wall 23 is provided with a second hole 234, the fourth protrusion 261 is provided with a third hole 2611, and the fifth protrusion 262 is provided with a fourth hole 2621. The battery cell module 20 includes a fourth fastener 254 and a fifth fastener 255. The fourth fastener 254 is fixed to the third hole 2611, and a portion of the first end wall 22 is located between the fourth fastener 254 and the fourth protrusion 261. The fifth fastener 255 is fixed to the fourth hole 2621, and a portion of the second end wall 23 is located between the fifth fastener 255 and the fifth protrusion 262, so as to fix the battery cell assembly 21 to the bottom wall 12.

[0107] In some embodiments, the bottom wall 12 is provided with a sixth protrusion 263 and a seventh protrusion 264, along the third direction Z, the first end wall 22 is provided on the sixth protrusion 263, and the second end wall 23 is provided on the seventh protrusion 264, the first end wall 22 is provided with a fifth hole 227, the second end wall 23 is provided with a sixth hole 235, the sixth protrusion 263 is provided with a seventh hole 2631, and the seventh protrusion 264 is provided with an eighth hole 2641, the battery cell module 20 includes a sixth fastener 256 and a seventh fastener 257, the sixth fastener 256 is fixed in the seventh hole 2631, a portion of the first end wall 22 is located between the sixth fastener 256 and the sixth protrusion 263, the seventh fastener 257 is fixed in the eighth hole 2641, and a portion of the second end wall 23 is located between the seventh fastener 257 and the seventh protrusion 264, so as to further fix the battery cell assembly 21 to the bottom wall 12.

[0108] In some embodiments, please refer to Figure 4 The battery module 20 includes a bracket 281 and a third circuit board 282. The bracket 281 is arranged on the battery assembly 21. The bracket 281 is fixed to the first end wall 22 and the second end wall 23. The third circuit board 282 is fixed to the surface of the bracket 281 away from the battery assembly 21. The third circuit board 282 is respectively connected to the battery assembly 21, the first circuit board 24 and the second circuit board 27 to control the charging and discharging of the battery assembly 21.

[0109] For the second aspect of this application, please refer to Fig.21 , an energy storage device 1000 is also proposed, comprising at least one battery pack 100 as described above. The energy storage device 1000 of the embodiment of the present application is not particularly limited, and it can be any energy storage device 1000 known in the prior art.

[0110] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery cell module, characterized in that: include: A first end wall and a second end wall, wherein the first end wall comprises a first base portion and a first protrusion connected to each other, the first end wall is provided with a first fixing hole, and at least a part of the first fixing hole is located at the first protrusion; A battery cell assembly, wherein the battery cell assembly is located between the first end wall and the second end wall along a first direction; the battery cell assembly comprises a plurality of battery cells, and the battery cells are provided with electrode terminals; a first circuit board, the electrode terminal being connected to the first circuit board, the first circuit board being provided with a first connection hole, the first protrusion being located in the first connection hole, and the first protrusion being configured to move in the first connection hole; The first fastener includes a first fastening portion fixed to the first fixing hole and a first limiting portion located outside the first fixing hole, and a portion of the first circuit board is located between the first limiting portion and the first base.

2. The battery cell module according to claim 1, characterized in that: Along the third direction, there is a first gap between the first protrusion and the first connecting hole, the length of the first gap does not exceed 1 mm, and the third direction is perpendicular to the first direction.

3. The battery cell module according to claim 1 or 2, characterized in that: Along the first direction, there is a second gap between the first protrusion and the first connecting hole, and the length of the second gap does not exceed 1 mm.

4. The battery cell module according to any one of claims 1 to 3, characterized in that: Along the second direction, the thickness of the first circuit board between the first limiting portion and the first base is D1, the distance between the first limiting portion and the first base is L1, L1 is greater than D1, and the second direction is perpendicular to the first direction.

5. The battery cell module according to any one of claims 1 to 4, characterized in that: The second end wall comprises a second base and a second protrusion connected to each other, the first circuit board is provided with a first notch, the first notch is away from the first end wall along the first direction, a portion of the second protrusion is located in the first notch, and in the third direction, the second protrusion is configured to move in the first notch; The second end wall is provided with a second fixing hole, at least a portion of the second fixing hole is located at the second protrusion, The battery cell module includes a second fastener, which includes a second fastening portion fixed to the second fixing hole and a second limiting portion located outside the second fixing hole, and a portion of the first circuit board is located between the second limiting portion and the second base.

6. The battery cell module according to claim 5, characterized in that: Along the second direction, the thickness of the portion of the first circuit board located between the second limiting portion and the second base is D2, the distance between the second limiting portion and the second base is L2, L2 is greater than D2, and the second direction is perpendicular to the first direction.

7. The battery cell module according to any one of claims 1 to 6, characterized in that: The first end wall includes a third protrusion connected to the first base, the first protrusion and the third protrusion are arranged in a third direction at intervals, and the third direction is perpendicular to the first direction. The first circuit board is provided with a first welding portion connected to the electrode terminal, and along the first direction, a projection of the first welding portion is located between the first convex portion and the third convex portion; The first circuit board is provided with a second connection hole, the third protrusion is located in the second connection hole, and the third protrusion is configured to move in the second connection hole. The first end wall is provided with a third fixing hole, at least part of which is located at the third protrusion. The battery cell module includes a third fastener, which includes a third fastening portion fixed to the third fixing hole and a third limiting portion located outside the third fixing hole, and a portion of the first circuit board is located between the third limiting portion and the first base.

8. The battery cell module according to claim 7, characterized in that: Along the third direction, there is a third gap between the third protrusion and the second connecting hole, and the length of the third gap does not exceed 2 mm and is greater than the length of the first gap between the first protrusion and the first connecting hole.

9. The battery cell module according to claim 7 or 8, characterized in that: Along the first direction, there is a fourth gap between the third protrusion and the second connecting hole, and the length of the fourth gap does not exceed 2 mm and is greater than the length of the second gap between the first protrusion and the first connecting hole.

10. The battery cell module according to any one of claims 7 to 9, characterized in that: Along the second direction, the thickness of the portion of the first circuit board located between the third limiting portion and the first base is D3, the distance between the third limiting portion and the first base is L3, L3 is greater than D3, and the second direction, the first direction and the third direction are perpendicular to each other.

11. The battery cell module according to any one of claims 1 to 10, characterized in that: The plurality of battery cells are arranged in an array along the first direction, and the electrode terminals of adjacent battery cells are stacked and welded to the first circuit board; The battery cell module includes a buffer component arranged on adjacent battery cells.

12. The battery cell module according to any one of claims 1 to 11, characterized in that: The battery cell module includes a first fixing member, which is arranged around the outer side of the first end wall and the outer side of the second end wall, and fixes the first end wall, the second end wall and the battery cell assembly.

13. A battery pack, characterized in that: It comprises a shell and the battery cell module as claimed in any one of claims 1 to 12, wherein the shell is provided with a containing cavity, and the battery cell module is located in the containing cavity.

14. An energy storage device, characterized in that: A battery pack comprising at least one battery as claimed in claim 13.

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