Battery module and assembling tool thereof

Abstract

The utility model relates to a battery module and an assembling tool thereof, and the battery module comprises a plurality of battery cells which are stacked side by side to form a battery cell group; the first fixing ring is arranged outside the battery cell group in a sleeving manner so as to fix the battery cell group, the first fixing ring is arranged at the end part of the battery cell group in the length direction, the first fixing ring comprises a main body part, the main body part is connected to the battery cell group in a sleeving manner so as to fix the battery cell group, the edge of one end of the main body part is provided with a turnup, and the edge of the other end of the main body part is provided with a groove. And the turned-over edge is used for being attached to the end part of the battery cell group along the length direction. Therefore, the first fixing ring is adopted to restrain the battery cell group, full restraint of six degrees of freedom of the battery cell group is realized, and the stability is higher than that of a common steel cable tie restraint. According to the battery module, the fixing structure is simplified, screw installation is omitted, the strength is guaranteed, the module can be quickly disassembled and assembled, and the production efficiency of products is greatly improved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to a battery module and an assembly tool thereof. Background Art

[0002] With the progress of society and the continuous development of science and technology, the requirements for various aspects of battery module performance are also constantly increasing. In related technologies, the bundling and fixing structure of battery modules mostly adopts the fixing method of screws and end plates. Among them, the fixing method of screws and end plates uses more parts, the product weight is heavier, and the assembly is relatively troublesome and not convenient enough; the fixing method of steel tie also requires tooling assistance, the strength of steel tie is relatively weak, and it is impossible to achieve full restraint of the battery module in six degrees of freedom, and the stability is poor. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery module and an assembly tool thereof to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above object, the present disclosure provides a battery module, comprising:

[0005] A plurality of battery cells are stacked side by side to form a battery cell group; and

[0006] A first fixing ring is sleeved on the outside of the battery cell group to fix the battery cell group, and the first fixing ring is arranged at the end of the battery cell group along the length direction.

[0007] The first fixing ring includes a main body, which is sleeved on the battery cell group to fix the battery cell group. One end edge of the main body has a flange, which is used to fit with the end of the battery cell group along the length direction.

[0008] Optionally, the multiple battery cells are stacked side by side in the thickness direction to form a battery cell group, and the main body includes two first fixing parts respectively fitted with the end parts of the battery cell group in the width direction and two second fixing parts respectively fitted with the end parts of the battery cell group in the thickness direction, and the flange is formed on the edge of at least one of the first fixing parts.

[0009] Optionally, in the thickness direction, the size of the flange is the same as the size of the first fixing portion.

[0010] Optionally, in the width direction, the size of the flange is smaller than half of the size of the second fixing portion.

[0011] Optionally, the flange includes a fitting portion for fitting with an end portion of the battery cell group along the length direction and a connecting portion connected to the main body, and the fitting portion is arranged perpendicular to the connecting portion.

[0012] Optionally, the battery module includes two first fixing rings, and the two first fixing rings are respectively arranged at two ends of the battery cell group along the length direction.

[0013] Optionally, the battery module further comprises a second fixing ring sleeved on the outside of the battery cell group, the second fixing ring being placed between two of the first fixing rings, and the second fixing ring being configured to fit with both ends of the battery cell group in the thickness direction and in the width direction.

[0014] Optionally, an insulating protective film is provided on the surface of the first fixing ring that is in contact with the battery cell group.

[0015] Optionally, a hanging seat is provided at the top of the first fixing ring, and a hanging hole is opened on the hanging seat.

[0016] Optionally, the battery cell group is provided with end plates at both ends along the thickness direction, and the first fixing ring is sleeved on the outside of the battery cell group and the end plates to fix the battery cell group and the end plates.

[0017] Optionally, foam is provided between the end plate and the battery cell group.

[0018] Optionally, buffer pads are provided at opposite ends of adjacent battery cells along the thickness direction, so that there are gaps between adjacent battery cells.

[0019] According to a second aspect of the present disclosure, there is also provided an assembly tool for assembling the above-mentioned battery module, the assembly tool comprising:

[0020] A bottom plate, the bottom plate comprising a bottom plate body and a connecting plate, the bottom plate body having an opening corresponding to the battery cell group, the connecting plate being disposed in the middle of the opening for supporting the battery cell group, and the opening being used for the bottom end of the first fixing ring to extend into;

[0021] A first limiting assembly, mounted on the bottom plate body, for limiting the length direction of the battery cell group; and

[0022] A second limiting assembly is installed on the bottom plate body and is used to limit the position of the battery cell group in the thickness direction.

[0023] Optionally, the first limiting assembly includes a limiting plate and a first cylinder for driving the limiting plate to move along the length direction, and the limiting plate is used to abut against the end of the battery cell group along the length direction.

[0024] Optionally, the base plate body is provided with two slide rails extending along the length direction, and two ends of the limiting plate are slidably connected to the two slide rails respectively.

[0025] Optionally, the battery module includes two first fixing rings and one second fixing ring, wherein the two first fixing rings are respectively arranged at both ends of the battery cell group along the length direction, and one second fixing ring is placed between the two first fixing rings, and one end of the connecting plate along the length direction is used to stop the side wall of the second fixing ring to limit the length direction of the second fixing ring.

[0026] Optionally, the opening includes a first opening located on one side of the connecting plate and a second opening located on the other side of the connecting plate, wherein the first opening is used for the bottom end of the second fixing ring to extend therein, a support plate is provided at the first opening, and a third cylinder for driving the support plate to move along the width direction is installed on the bottom plate body, wherein the third cylinder is configured as follows:

[0027] Before installing the battery cell group, driving the support plate to move to be flush with the connecting plate;

[0028] When installing the second fixing ring, the support plate is driven to move downward so that the top end of the support plate is lower than the bottom end of the second fixing ring.

[0029] Optionally, the assembly tool includes a first limiting component, and the first limiting component is arranged at one end of the base plate body close to the second opening along the length direction.

[0030] Optionally, the second limiting assembly includes a clamping group, the clamping group includes two oppositely arranged clamping plates and a second cylinder for driving the clamping plates to move along the thickness direction, and the two clamping plates are used to abut against both ends of the battery cell group along the thickness direction.

[0031] Optionally, the second limiting assembly includes three clamping groups, one of which is located at the second opening, and the other two are located at the first opening and are arranged at intervals.

[0032] With the above technical solution, it is only necessary to sleeve the first fixing ring on the outside of the battery cell group so that the flange fits on the end of the battery cell group along the length direction, which is simple to install. By setting the flange on the edge of the main body, the end face of the battery cell group along the length direction can be restrained. The first fixing ring is used to restrain the battery cell group, which realizes full restraint of the six degrees of freedom of the battery cell group, and has higher stability than ordinary steel tie restraint. The battery module simplifies the fixing structure, eliminates the need for screw installation, ensures strength, and can realize rapid disassembly and assembly of the module, greatly improving product production efficiency.

[0033] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0035] Figure 1 is a schematic structural diagram of a battery module provided by an exemplary embodiment of the present disclosure;

[0036] Figure 2 is a schematic diagram of a disassembled battery module provided by an exemplary embodiment of the present disclosure;

[0037] Figure 3 is a structural schematic diagram of an assembly tool provided by an exemplary embodiment of the present disclosure;

[0038] Figure 4 It is a schematic diagram of assembling a battery module on an assembly tool provided in an exemplary embodiment of the present disclosure.

[0039] Description of Reference Numerals

[0040] 1-battery core; 10-battery core group; 11-end plate; 12-foam; 21-first fixing ring; 211-main body; 2111-first fixing part; 2112-second fixing part; 212-flange; 2121-fitting part; 2122-connecting part; 22-second fixing ring; 201-lifting seat; 2011-lifting hole; 3-buffer pad; 4-bottom plate; 41-bottom plate body; 411-opening; 4111-first opening; 4112-second opening; 42-connecting plate; 51-limiting plate; 52-first cylinder; 53-slide rail; 6-clamping group; 61-clamping plate; 62-second cylinder; 71-support plate; 72-third cylinder; 601-first clamping group; 602-second clamping group; 603-third clamping group DETAILED DESCRIPTION

[0041] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0042] In the present disclosure, unless otherwise stated, the directional terms "upper", "lower", "top", and "bottom" used are defined based on the directions in which the relevant components are actually used. The directional terms "length direction", "width direction", and "thickness direction" used are based on the directions of the drawings, with reference to Figure 1"Length direction", "width direction" and "thickness direction" are just definitions for convenience of description and do not limit the dimensional relationship in the three directions. "Inside" and "outside" refer to the outline of the corresponding parts. The terms "first" and "second" are used to distinguish different parts and do not have order and importance. In this disclosure, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0043] Reference Figure 1 , Figure 2 The present disclosure provides a battery module, which may include a plurality of battery cells 1 and a first fixing ring 21, wherein the plurality of battery cells 1 are stacked side by side to form a battery cell group 10; the first fixing ring 21 is sleeved on the outside of the battery cell group 10 to fix the battery cell group 10, and the first fixing ring 21 is arranged at the end of the battery cell group 10 along the length direction, wherein the first fixing ring 21 includes a main body 211, the main body 211 is sleeved on the battery cell group 10 to fix the battery cell group 10, and one end edge of the main body 211 has a flange 212, and the flange 212 is used to fit with the end of the battery cell group 10 along the length direction. In the embodiment of the present disclosure, reference Figure 1 , the first fixing ring 21 is sleeved on the end of the battery cell group 10 along the length direction, not only the main body 211 constrains the two end faces opposite to each other in the width direction and the two end faces opposite to each other in the thickness direction of the battery cell group 10, but also the flange 212 constrains the end faces of the battery cell group 10 along the length direction, so that the six degrees of freedom of the battery cell group 10 can be constrained, with a simple structure, convenient operation and high stability. Specifically, the material of the first fixing ring 21 can be iron, and its raw material is widely used and low in price, which further improves the convenience of production. In addition, the material of the first fixing ring 21 is not limited to iron, but can also be high-strength materials such as steel, and the product has strong compatibility.

[0044] With the above technical solution, it is only necessary to sleeve the first fixing ring on the outside of the battery cell group so that the flange fits on the end of the battery cell group along the length direction, which is simple to install. By setting the flange on the edge of the main body, the end face of the battery cell group along the length direction can be restrained. The first fixing ring is used to restrain the battery cell group, which realizes full restraint of the six degrees of freedom of the battery cell group, and has higher stability than ordinary steel tie restraint. The battery module simplifies the fixing structure, eliminates the need for screw installation, ensures strength, and can realize rapid disassembly and assembly of the module, greatly improving product production efficiency.

[0045] In some embodiments, reference Figure 2, multiple battery cells 1 are stacked side by side in the thickness direction to form a battery cell group 10, the main body 211 may include two first fixing parts 2111 respectively fitted with the ends of the battery cell group 10 in the width direction and two second fixing parts 2112 respectively fitted with the ends of the battery cell group 10 in the thickness direction, and the flange 212 is formed on the edge of at least one of the first fixing parts 2111. In this way, the size of the flange 212 in the width direction can be set smaller, that is, all the battery cells 1 stacked in the thickness direction can be limited in the length direction. In this arrangement, the size of the flange 212 in the width direction will not affect the limiting effect. If the flange 212 is formed on the second fixing part 2112, the size of the flange 212 in the thickness direction needs to be large enough to limit all the battery cells 1. In this way, the flange 212 will interfere with the pole, which is inconvenient to set.

[0046] Further, refer to Figure 1 , Figure 2 In the thickness direction, the size of the flange 212 is the same as the size of the first fixing portion 2111. This arrangement enables the flange 212 to limit the displacement of each battery cell 1 in the length direction.

[0047] Further, refer to Figure 1 , Figure 2 In the width direction, the size of the flange 212 is less than half of the size of the second fixing portion 2112. Since multiple battery cells 1 are stacked side by side in the thickness direction, the flange 212 only needs to fit with each battery cell 1 in the thickness direction to achieve positioning. Therefore, the size of the flange 212 in the width direction will not affect the positioning effect, so the size in the width direction can be set smaller to avoid interference with the poles of the battery cell group 10, save materials, and reduce weight.

[0048] As an exemplary embodiment of the present disclosure, refer to Figure 2 The flange 212 may include a fitting portion 2121 for fitting with the end of the battery cell group 10 along the length direction and a connecting portion 2122 connected to the main body 211, and the fitting portion 2121 and the connecting portion 2122 are vertically arranged. In the embodiment of the present disclosure, the connecting portion 2122 is fixed on the main body 211, and the fitting portion 2121 is integrally formed on the connecting portion 2122. In other embodiments, the connecting portion 2122 may also be welded to the main body 211, or fixedly connected by a fastening point, and the fitting portion 2121 and the connecting portion 2122 may also be welded or bolted. The present disclosure does not limit the connection relationship between the fitting portion 2121 and the connecting portion 2122 and the connection relationship between the connecting portion 2122 and the main body 211. It only needs to achieve the limiting effect on the battery cell 1 in the length direction, and all of them belong to the protection scope of the present disclosure.

[0049] In the implementation of this disclosure, reference Figure 1The battery module may include two first fixing rings 21, which are respectively arranged at two ends of the battery cell group 10 along the length direction so as to constrain two opposite end surfaces of the battery cell group along the length direction.

[0050] In some embodiments, reference Figure 1 The battery module may further include a second fixing ring 22 sleeved on the outside of the battery cell group 10, the second fixing ring 22 is placed between the two first fixing rings 21, and the second fixing ring 22 may be configured to fit with both ends of the battery cell group 10 in the thickness direction and both ends in the width direction. Adding the second fixing ring 22 can fix the battery cell group 10 more stably. The present disclosure does not limit the number of second fixing rings 22, and multiple first fixing rings 21 and second fixing rings 22 are sleeved on the outside of the battery cell group 10 at even intervals.

[0051] Furthermore, the surface of the first fixing ring 21 that is in contact with the battery cell group 10 can be provided with an insulating protective film to prevent the metal structure inside the first fixing ring 21 from directly contacting the battery cell 1. The insulating protective film can provide a good insulating effect to ensure that the first fixing ring 21 and the battery cell group 10 have good insulation performance, thereby effectively avoiding short circuits and further improving the safety of the battery module. In addition, the surface of the second fixing ring 22 that is in contact with the battery cell group 10 is also provided with an insulating protective film.

[0052] Among them, reference Figure 1 , Figure 2 The top of the first fixing ring 21 may be provided with a lifting seat 201, and the lifting seat 201 is provided with a lifting hole 2011. The battery module can be lifted and transported, which is convenient for carrying the battery module. In addition, the top of the second fixing ring 22 may also be provided with a lifting seat 201.

[0053] According to an exemplary embodiment of the present disclosure, Figure 1 The battery cell group 10 may be provided with end plates 11 at both ends along the thickness direction, and the first fixing ring 21 is wrapped around the outside of the battery cell group 10 and the end plates 11 to fix the battery cell group 10 and the end plates 11 to form a stable battery module.

[0054] Further, refer to Figure 2 A foam 12 may be provided between the end plate 11 and the battery cell group 10. Specifically, the foam may be made of a polypropylene porous foam material or a polypropylene plastic foam material, both of which have a large number of tiny pores inside, and have excellent shock absorption, cushioning, heat insulation and sound absorption properties, and can be recycled or naturally degraded, and have good environmental performance.

[0055] In some embodiments, reference Figure 2Buffer pads 3 may be provided at opposite ends of adjacent battery cells 1 along the thickness direction, so that there is a gap between adjacent battery cells 1. The buffer pads 3 can absorb the expansion and deformation of the battery cells 1, and the gaps between adjacent battery cells 1 can reduce the impact on other battery cells 1 when the battery cells 1 expand and deform.

[0056] According to the second aspect of the present disclosure, an assembly tool is also provided, which is used to assemble the above-mentioned battery module. The assembly tool may include a bottom plate 4, a first limiting component and a second limiting component, wherein the bottom plate 4 may include a bottom plate body 41 and a connecting plate 42, the bottom plate body 41 has an opening 411 corresponding to the battery cell group 10, the connecting plate 42 is placed in the middle of the opening 411 to support the battery cell group 10, and the opening 411 is used for the bottom end of the first fixing ring 21 to extend into, and in addition, the bottom plate 4 is affixed with an insulating film at the position where the battery cell 1 is in contact; the first limiting component is installed on the bottom plate body 41, and is used to limit the length direction of the battery cell group 10; the second limiting component is installed on the bottom plate body 41, and is used to limit the thickness direction of the battery cell group 10. The assembly tool has a regular structure, can respond quickly, and greatly reduces the manufacturing cost. The assembly tool with a simple structure can realize the rapid disassembly and assembly of the battery module, which greatly improves the production efficiency of the product.

[0057] Among them, reference Figure 3 The first limiting assembly may include a limiting plate 51 and a first cylinder 52 for driving the limiting plate 51 to move along the length direction. The limiting plate 51 is used to abut against the end of the battery cell group 10 along the length direction. The first cylinder 52 drives the limiting plate 51 to move to a specified position along the length direction, so that the limiting plate 51 plays a role in limiting the end of the battery cell group 10 along the length direction.

[0058] Further, refer to Figure 3 Two slide rails 53 extending along the length direction may be provided on the bottom plate body 41 , and both ends of the limiting plate 51 may be slidably connected to the two slide rails 53 , so that the limiting plate 51 can slide stably along the slide rails 53 along the length direction.

[0059] In the embodiments of the present disclosure, reference Figure 3 , Figure 4The battery module may include two first fixing rings 21 and one second fixing ring 22, wherein the two first fixing rings 21 are respectively arranged at the two ends of the battery cell group 10 along the length direction, and a second fixing ring 22 is placed between the two first fixing rings 21, and one end of the connecting plate 42 along the length direction is used to stop the side wall of the second fixing ring 22 to limit the position of the second fixing ring 22 in the length direction. Move the second fixing ring 22 along the length direction until its side wall contacts one end of the connecting plate 42 along the length direction, and the second fixing ring 22 reaches the predetermined position. Therefore, in addition to supporting the battery cell group 10, the connecting plate 42 can also limit the position of the second fixing ring 22.

[0060] Further, refer to Figure 3 The opening 411 may include a first opening 4111 located on one side of the connecting plate 42 and a second opening 4112 located on the other side of the connecting plate 42, wherein the first opening 4111 is used for the bottom end of the second fixing ring 22 to extend into, and a support plate 71 is provided at the first opening 4111, and a third cylinder 72 for driving the support plate 71 to move along the width direction is installed on the bottom plate body 41, wherein the third cylinder 72 may be configured to: drive the support plate 71 to move flush with the connecting plate 42 before installing the battery cell group 10; and drive the support plate 71 to move downward when installing the second fixing ring 22 so that the top end of the support plate 71 is lower than the bottom end of the second fixing ring 22. Specifically, before placing the battery cell 1 on the assembly tool, the third cylinder 72 drives the support plate 71 to extend so that the top surface of the support plate 71 is flush with the top surface of the connecting plate 42, so as to support the battery cell group 10; when installing the second fixing ring 22, the support plate 71 is retracted so that the top end of the support plate 71 is lower than the bottom end of the second fixing ring 22, so as to avoid interference between the support plate 71 and the second fixing ring 22. Specifically, an insulating film may be attached to the top of the support plate 71.

[0061] In some embodiments, reference Figure 3 , the assembly tool may include a first limiting component, and the first limiting component is arranged at one end of the bottom plate body 41 close to the second opening 4112 along the length direction. The first limiting component is not arranged at one end of the bottom plate body 41 close to the first opening 4111 along the length direction, so as to facilitate the installation of the second fixing ring 22, and one first limiting component can meet the limitation of the battery cell group 10 in the length direction. In other embodiments, the first limiting component may also be arranged at one end of the bottom plate body 41 close to the first opening 4111 along the length direction, and the present disclosure does not limit the number of the first limiting components.

[0062] Among them, reference Figure 4The second limiting assembly may include a clamping group 6, and the clamping group 6 may include two clamping plates 61 arranged opposite to each other and a second cylinder 62 for driving the clamping plates 61 to move in the thickness direction, and the two clamping plates 61 are used to abut against both ends of the battery cell group 10 in the thickness direction. The second cylinder 62 drives the clamping plates 61 to move to clamp the battery cell group 10 in the thickness direction. Specifically, the end of the clamping plate 61 close to the battery cell group 10 may be fixedly provided with silicone rubber, and the contact between the silicone rubber and the battery cell group 10 can protect the battery cell group 10, thereby avoiding the friction between the clamping plate 61 and the battery cell 1 and causing damage to the battery cell 1.

[0063] In the embodiments of the present disclosure, reference Figure 3 The second limiting assembly may include three clamping groups 6, one of which is located at the second opening 4112, and the other two clamping groups 6 are located at the first opening 4111 and are arranged at intervals. Figure 3 The first clamping group 601 is located at the second opening 4112, the second clamping group 602 and the third clamping group 603 are located at the first opening 4111, the second clamping group 602 is closer to the first clamping group 601 relative to the third clamping group 603, the first clamping group 601 and the second clamping group 602 are used to clamp the battery cell group 10 in the thickness direction, and the third clamping group 603 is used to alternately clamp the battery cell group 10 with the second clamping group 602 when installing the second fixing ring 22.

[0064] Specifically, the operation process of the assembly tool is as follows:

[0065] The first cylinder 52 drives the limiting plate 51 to move to the specified position, so as to limit the end of the battery cell 1 close to the second opening 4112 along the length direction; the third cylinder 72 drives the supporting plate 71 to extend, so that the top surface of the supporting plate 71 is flush with the top surface of the bottom plate 4, so as to support the battery cell group 10; the end plate 11 with the foam 12 is placed on the first end of the bottom plate 4 in the thickness direction; a battery cell 1 is placed against the foam 12; the buffer pad 3 is attached to the side of the battery cell 1, and then the battery cells 1 with the buffer pad 3 attached are placed next to the first battery cell 1 in turn until they are full; another end plate 11 with the foam 12 is placed next to the last battery cell 1; the first clamping group 601 and the second clamping group 602 are actuated to clamp the battery cell group 10 in the thickness direction; the third cylinder 72 drives the supporting plate 71 to extend, so that the top surface of the supporting plate 71 is flush with the top surface of the bottom plate 4, so as to support the battery cell group 10; the end plate 11 with the foam 12 is placed on the first end of the bottom plate 4 ... as to support the battery cell group 10; the end plate 11 with the foam 12 is placed on the first end of the bottom plate 4 in the thickness direction; the third cylinder 72 drives the supporting plate 71 to extend, so as to support the battery cell group 10; the end plate 11 with the foam 1 The cylinder 72 drives the support plate 71 to move downward; the second fixing ring 22 is inserted from the end of the battery cell group 10 away from the first cylinder 52 between the second clamping group 602 and the third clamping group 603; the third clamping group 603 clamps the battery cell group 10; the second clamping group 602 releases the battery cell group 10; the second fixing ring 22 is moved to contact with one end of the connecting plate 42 along the length direction, and the second fixing ring 22 reaches the predetermined position; the second clamping group 602 clamps the battery cell group 10; the third clamping group 603 releases the battery cell group 10; the first cylinder 52 drives the limit plate 51 to retract so that the limit plate 51 moves to the specified position in the direction away from the battery cell group 10; the two first fixing rings 21 are respectively mounted on the opposite ends of the battery cell group 10 along the length direction; the battery module is assembled.

[0066] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0068] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery module, characterized in that: include: A plurality of battery cells are stacked side by side to form a battery cell group; as well as A first fixing ring is sleeved on the outside of the battery cell group to fix the battery cell group, and the first fixing ring is arranged at the end of the battery cell group along the length direction. The first fixing ring includes a main body, which is sleeved on the battery cell group to fix the battery cell group. One end edge of the main body has a flange, which is used to fit with the end of the battery cell group along the length direction.

2. The battery module according to claim 1, characterized in that: The multiple battery cells are stacked side by side in the thickness direction to form a battery cell group. The main body includes two first fixing parts respectively fitted with the end parts of the battery cell group in the width direction and two second fixing parts respectively fitted with the end parts of the battery cell group in the thickness direction. The flange is formed on the edge of at least one of the first fixing parts.

3. The battery module according to claim 2, characterized in that: In the thickness direction, the size of the flange is the same as the size of the first fixing portion.

4. The battery module according to claim 2, characterized in that: In the width direction, the dimension of the flange is smaller than half of the dimension of the second fixing portion.

5. The battery module according to claim 1, characterized in that: The flange includes a fitting portion for fitting with the end of the battery cell group along the length direction and a connecting portion connected to the main body, and the fitting portion is arranged perpendicular to the connecting portion.

6. The battery module according to claim 1, characterized in that: The battery module includes two first fixing rings, which are respectively arranged at two ends of the battery cell group along the length direction.

7. The battery module according to claim 6, characterized in that: The battery module also includes a second fixing ring sleeved on the outside of the battery cell group, the second fixing ring is placed between the two first fixing rings, and the second fixing ring is configured to fit with both ends of the battery cell group along the thickness direction and the two ends along the width direction.

8. The battery module according to claim 1, characterized in that: An insulating protective film is attached to the surface of the first fixing ring for contacting with the battery cell group.

9. The battery module according to claim 1, characterized in that: A hanging seat is provided at the top of the first fixing ring, and a hanging hole is opened on the hanging seat.

10. The battery module according to claim 1, characterized in that: The battery cell group is provided with end plates at both ends along the thickness direction, and the first fixing ring is sleeved on the outside of the battery cell group and the end plates to fix the battery cell group and the end plates.

11. The battery module according to claim 10, characterized in that: Foam is provided between the end plate and the battery cell group.

12. The battery module according to claim 1, characterized in that: Buffer pads are provided at opposite ends of adjacent battery cells along the thickness direction, so that there are gaps between adjacent battery cells.

13. An assembly tool, characterized in that: Used to assemble the battery module according to any one of claims 1 to 12, the assembly tool comprises: A bottom plate, the bottom plate comprising a bottom plate body and a connecting plate, the bottom plate body having an opening corresponding to the battery cell group, the connecting plate being disposed in the middle of the opening for supporting the battery cell group, and the opening being used for the bottom end of the first fixing ring to extend into; A first limiting assembly, mounted on the bottom plate body, for limiting the length direction of the battery cell group; and A second limiting assembly is installed on the bottom plate body and is used to limit the position of the battery cell group in the thickness direction.

14. The assembly tool according to claim 13, characterized in that: The first limiting assembly includes a limiting plate and a first cylinder for driving the limiting plate to move along the length direction, and the limiting plate is used to abut against the end of the battery cell group along the length direction.

15. The assembly tool according to claim 14, characterized in that: The bottom plate body is provided with two slide rails extending along the length direction, and the two ends of the limit plate are slidably connected to the two slide rails respectively.

16. The assembly tool according to claim 13, characterized in that: The battery module includes two first fixing rings and one second fixing ring, wherein the two first fixing rings are respectively arranged at both ends of the battery cell group along the length direction, and one second fixing ring is placed between the two first fixing rings, and one end of the connecting plate along the length direction is used to stop the side wall of the second fixing ring to limit the length direction of the second fixing ring.

17. The assembly tool according to claim 16, characterized in that: The opening includes a first opening located on one side of the connecting plate and a second opening located on the other side of the connecting plate, wherein the first opening is used for the bottom end of the second fixing ring to extend therein, a support plate is provided at the first opening, and a third cylinder for driving the support plate to move along the width direction is installed on the bottom plate body, wherein the third cylinder is configured as follows: Before installing the battery cell group, driving the support plate to move to be flush with the connecting plate; When installing the second fixing ring, the support plate is driven to move downward so that the top end of the support plate is lower than the bottom end of the second fixing ring.

18. The assembly tool according to claim 17, characterized in that: The assembly tool includes a first limiting component, and the first limiting component is arranged at one end of the bottom plate body close to the second opening along the length direction.

19. The assembly tool according to claim 17, characterized in that: The second limiting assembly includes a clamping group, which includes two clamping plates arranged opposite to each other and a second cylinder for driving the clamping plates to move along the thickness direction, and the two clamping plates are used to abut against two ends of the battery cell group along the thickness direction.

20. The assembly tool according to claim 19, characterized in that: The second limiting assembly includes three clamping groups, one of which is located at the second opening, and the other two are located at the first opening and are arranged at intervals.

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