Welding-free connecting mechanism for power battery module and power battery module

Abstract

The utility model provides a welding-free connecting mechanism for a power battery module and the power battery module. The welding-free connecting mechanism for the power battery module comprises a support, a connecting piece assembly, an elastic piece and a cover plate, a through hole and a sleeving cavity which are communicated with each other are formed in the support, a first connecting piece abuts against the support, a via hole communicated with the through hole is formed in the first connecting piece, and a second connecting piece abuts against the first connecting piece. The limiting protrusion of the second connecting piece sequentially penetrates through the via hole and the through hole. The elastic piece is magnetically attracted to the second connecting piece, a buckling protrusion is arranged on the side, away from the second connecting piece, of the elastic piece, a buckling groove is formed in the cover plate, and the buckling protrusion is connected with the inner wall of the buckling groove in a buckled mode. According to the battery module, a welding connection mode of a traditional battery module is canceled, the investment of production resources is reduced, the tedious flow of a welding process is omitted, and the production efficiency of the battery module is improved; and the failure problem caused by welding quality is avoided, and the reliability and stability of the battery module are guaranteed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular to a welding-free connection mechanism for a power battery module and a power battery module. Background Art

[0002] Power battery modules are vital components in modern electric vehicles and renewable energy systems.

[0003] The assembly of traditional battery modules usually involves a large number of welding processes. The assembly of battery modules can be realized more conveniently by welding connection. However, the welding connection method also has the following problems:

[0004] 1. The welding connection method requires complex welding processes and equipment, which increases the input of production resources and the complexity of the production process, and reduces the production efficiency of the battery module;

[0005] 2. As the usage cycle increases, there is a risk of loosening or breaking of welding points, especially in an environment of vibration or workload changes, which can easily lead to a decrease in the reliability and stability of the battery module;

[0006] 3. The welding connection method makes it difficult to maintain and replace the single cells in the battery module. Special equipment and technology are required to maintain the single cells, which prolongs the maintenance time and increases the workload of the operator. Utility Model Content

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method of eliminating traditional welding connections, eliminating the cumbersome process of welding technology, making the assembly of battery modules simpler and improving the production efficiency of battery modules, thereby providing a welding-free connection mechanism and a power battery module for power battery modules.

[0008] The purpose of this disclosure is achieved through the following technical solutions:

[0009] A welding-free connection mechanism for a power battery module comprises a bracket, a connecting piece assembly, a spring sheet and a cover plate, the bracket is formed with a through hole and a sleeve cavity that are interconnected, and the inner wall of the sleeve cavity is sleeved and connected to one end of a single battery; the connecting piece assembly comprises a first connecting piece and a second connecting piece, the first connecting piece abuts against the bracket, and the first connecting piece is formed with a through hole that is connected to the through hole, the second connecting piece abuts against the first connecting piece, and the second connecting piece is provided with a limiting protrusion, the limiting protrusion is sequentially penetrated through the through hole and the through hole, so that the limiting protrusion abuts against the pole ear of the single battery; the spring sheet is magnetically adsorbed on the side of the second connecting piece that is away from the first connecting piece, and the side of the spring sheet that is away from the second connecting piece is provided with a buckling protrusion; the cover plate is formed with a buckling groove, and the buckling protrusion is buckled and connected with the inner wall of the buckling groove.

[0010] In one embodiment, the number of the bracket, the second connecting piece, and the spring sheet is multiple, and the multiple brackets are arranged in a one-to-one correspondence with the multiple single cells of the power battery module, the inner wall of the sleeve cavity of each bracket is sleeved and connected to one end of the corresponding single cell, the first connecting piece is formed with a plurality of the via holes, and the plurality of the via holes are connected in a one-to-one correspondence with the plurality of through holes of the brackets; the plurality of the second connecting pieces are arranged in a one-to-one correspondence with the plurality of the via holes, and the limiting protrusions of each second connecting piece are sequentially penetrated through the corresponding via holes and the corresponding through holes, the plurality of the spring sheets are arranged in a one-to-one correspondence with the plurality of the second connecting pieces, and each of the spring sheets is magnetically adsorbed on the corresponding second connecting piece, the cover plate is formed with a plurality of the buckling grooves, and the plurality of the buckling grooves are arranged in a one-to-one correspondence with the buckling protrusions of the plurality of the spring sheets, and each of the buckling protrusions is buckled and connected with the inner wall of the corresponding buckling groove.

[0011] In one embodiment, the connection mechanism for welding-free power battery modules also includes multiple screws, and a avoidance gap is formed between any three adjacent single cells of the power battery module. The first connecting plate is formed with multiple first screw holes, and the multiple first screw holes are connected to the multiple avoidance gaps in a one-to-one correspondence. The cover plate is formed with multiple second screw holes, and the multiple second screw holes are arranged in a one-to-one correspondence with the multiple first screw holes. Each of the screws is sequentially inserted into the corresponding avoidance gap and the corresponding first screw hole, and is screwed to the inner wall of the corresponding second screw hole.

[0012] In one embodiment, the bracket is formed with a plurality of the through holes and a plurality of the sleeve cavities, and the plurality of the sleeve cavities are connected with the plurality of the through holes in a one-to-one correspondence; the first connecting piece abuts against the bracket, and the first connecting piece is formed with a plurality of the through holes, and the plurality of the through holes are connected with the plurality of the through holes in a one-to-one correspondence; the second connecting piece abuts against the first connecting piece, and the second connecting piece is provided with a plurality of the limiting protrusions, and the plurality of the limiting protrusions are arranged in a one-to-one correspondence with the plurality of the through holes, and each of the limiting protrusions is sequentially penetrated through the corresponding through hole and the corresponding through hole, the spring sheet is magnetically adsorbed on the second connecting piece, and a plurality of the buckling protrusions are provided on the side of the spring sheet facing away from the second connecting piece, and the cover plate is formed with a plurality of buckling grooves, and the plurality of the buckling protrusions are arranged in a one-to-one correspondence with the plurality of the buckling grooves, and each of the buckling protrusions is buckled and connected with the inner wall of the corresponding buckling groove.

[0013] In one embodiment, there are multiple snap-in protrusions, which are evenly distributed on a side of the spring sheet away from the second connecting sheet, and each of the snap-in protrusions is snap-connected to an inner wall of the snap-in groove.

[0014] In one embodiment, each of the buckling protrusions is a claw-shaped structure.

[0015] In one embodiment, the limiting protrusion is stamped and formed on the second connecting piece.

[0016] In one embodiment, the second connecting piece is an iron sheet, and the elastic piece is a magnet.

[0017] In one embodiment, the second connecting piece is an iron piece, and a magnet is provided on a side of the spring piece adjacent to the second connecting piece so that the spring piece is adsorbed and connected to the second connecting piece.

[0018] A power battery module comprises a plurality of single cells and two welding-free connection mechanisms for a power battery module as described in any of the above embodiments, wherein the plurality of single cells are arranged in rows in sequence.

[0019] Compared with the prior art, the present invention has the following advantages, including but not limited to:

[0020] 1. The traditional welding connection method of the battery module is cancelled, the investment of production resources is reduced, the cumbersome process of welding technology is omitted, the assembly of the battery module is simpler, and the production efficiency of the battery module is improved;

[0021] 2. Avoid failure problems caused by welding quality and ensure the reliability and stability of the battery module;

[0022] 3. Since the assembly and disassembly of the battery module is simpler, it is easy to maintain and replace the battery cells, which reduces the workload of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of a welding-free connection mechanism for a power battery module in one embodiment;

[0025] Figure 2 for Figure 1 An exploded view of a welding-free connection mechanism for a power battery module is shown;

[0026] Figure 3 for Figure 2 A schematic diagram of the structure of a spring piece in a welding-free connection mechanism for a power battery module is shown;

[0027] Figure 4 This is a schematic diagram of the structure of a power battery module in one embodiment;

[0028] Figure 5 for Figure 4 The connection relationship diagram between the screw and each single battery in the power battery module shown;

[0029] Figure 6 An exploded view of a welding-free connection mechanism for a power battery module in another embodiment. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0034] See also Figure 1 and Figure 2 , which is a welding-free connection mechanism 10 for a power battery module according to an embodiment of the present disclosure, comprising a bracket 100, a connecting piece assembly 200, a spring piece 300 and a cover plate 400, wherein the bracket 100 is formed with a through hole 101 and a sleeve cavity 102 that are interconnected, and the inner wall of the sleeve cavity 102 is sleeved and connected to one end of a single battery 20; the connecting piece assembly 200 comprises a first connecting piece 210 and a second connecting piece 220, wherein the first connecting piece 210 abuts against the bracket 100, and the first connecting piece 210 is formed with a through hole 2101 that is connected to the through hole 101, and the second connecting piece 220 20 is in contact with the first connecting piece 210, and the second connecting piece 220 is provided with a limiting protrusion 222, and the limiting protrusion 222 is sequentially penetrated through the through hole 2101 and the through hole 101, so that the limiting protrusion 222 is in contact with the pole ear of the single battery 20; the elastic sheet 300 is magnetically adsorbed on the side of the second connecting piece 220 away from the first connecting piece 210, and the side of the elastic sheet 300 away from the second connecting piece 220 is provided with a snap-on protrusion 310; the cover plate 400 is formed with a snap-on groove 401, and the snap-on protrusion 310 is snap-connected with the inner wall of the snap-on groove 401.

[0035] In this embodiment, the bracket 100 is formed with a through hole 101 and a sleeve cavity 102 that are interconnected. The inner wall of the sleeve cavity 102 is used to be sleeved and connected to one end of the single battery 20 to fix one end of the single battery 20. The first connecting piece 210 is abutted against the bracket 100. The first connecting piece 210 is formed with a through hole 2101 that is connected to the through hole 101. Then the second connecting piece 220 is abutted against the first connecting piece 210. The limiting protrusion 222 of the second connecting piece 220 is sequentially penetrated through the through hole 2101 and the through hole 101, so that the limiting protrusion 222 is abutted against the pole ear of the single battery 20, and the limiting protrusion 222 simultaneously limits the bracket 100 and the first connecting piece 210, and then the spring piece 300 is magnetically adsorbed on the second connecting piece. The cover plate 400 is provided with a snap-fitting protrusion 310 on the side of the spring sheet 300 facing away from the second connecting sheet 220, and a snap-fitting groove 401 is formed on the cover plate 400. Finally, the snap-fitting protrusion 310 is snap-fitted with the inner wall of the snap-fitting groove 401, and the spring sheet 300 is again limited and fixed by the cover plate 400, so that the connection mechanism 10 for power battery module free of welding is firmly connected to one end of the single battery 20; similarly, another connection mechanism 10 for power battery module free of welding is used to fix the other end of the single battery 20. It can be understood that the connection mechanism 10 for power battery module free of welding can also be used for multiple single batteries 20 arranged in sequence to form a battery module.

[0036] In this embodiment, the traditional welding connection method of the battery module is eliminated, the investment in production resources is reduced, and the cumbersome process of the welding process is eliminated, so that the assembly of the battery module is simpler and the production efficiency of the battery module is improved; failure problems caused by welding quality are avoided, and the reliability and stability of the battery module are guaranteed; since the assembly and disassembly of the battery module are simpler, it is easy to maintain and replace the battery cells, which reduces the workload of the operator.

[0037] In one embodiment, see Figure 6The number of the bracket 100, the second connecting piece 220, and the spring piece 300 are all multiple, and the multiple brackets 100 are arranged in a one-to-one correspondence with the multiple single cells 20 of the power battery module 10a. The inner wall of the sleeve cavity 102 of each bracket 100 is sleeved and connected to one end of the corresponding single cell 20. The first connecting piece 210 is formed with a plurality of via holes 2101, and the plurality of via holes 2101 are connected to the through holes 101 of the multiple brackets 100 in a one-to-one correspondence; the plurality of second connecting pieces 220 are connected to the plurality of via holes 2101 in a one-to-one correspondence. It should be set, and the limiting protrusion 222 of each second connecting piece 220 is sequentially penetrated in the corresponding through hole 2101 and the corresponding through hole 101, multiple spring pieces 300 are set in one-to-one correspondence with multiple second connecting pieces 220, each spring piece 300 is magnetically adsorbed on the corresponding second connecting piece 220, and the cover plate 400 is formed with multiple snap-on grooves 401, and multiple snap-on grooves 401 are set in one-to-one correspondence with multiple snap-on protrusions 310 of the spring pieces 300, and each snap-on protrusion 310 is snap-fitted and connected with the inner wall of the corresponding snap-on groove 401.

[0038] In this embodiment, a plurality of single cells 20 are first arranged in sequence, and then the inner wall of the sleeve cavity 102 of each bracket 100 is sleeved and connected to one end of the corresponding single cell 20 to fix one end of each single cell 20, and then the first connecting piece 210 is simultaneously abutted against the plurality of brackets 100, and the first connecting piece 210 is formed with a plurality of through holes 2101, ensuring that the plurality of through holes 2101 are connected with the through holes 101 of the plurality of brackets 100 in a one-to-one correspondence; then, a plurality of second connecting pieces 220 are arranged in a one-to-one correspondence with the plurality of through holes 2101, that is, a plurality of second connecting pieces 220 are placed on the first connecting piece 210, and the limiting protrusions 222 of each second connecting piece 220 are sequentially penetrated into the corresponding through holes 2101 and the corresponding through holes 101, ensuring that each limiting protrusion 222 is abutted against the pole ear of the corresponding battery monomer, and the corresponding bracket 100 and the corresponding first connecting piece 210 are limited by each limiting protrusion 222; The multiple spring sheets 300 and the multiple second connecting sheets 220 are arranged in a one-to-one correspondence, and each spring sheet 300 is magnetically adsorbed on the corresponding second connecting sheet 220 to limit the position of each second connecting sheet 220. Since the cover plate 400 is formed with a plurality of buckling grooves 401, the multiple buckling grooves 401 are arranged in a one-to-one correspondence with the buckling protrusions 310 of the multiple spring sheets 300. By buckling and connecting each buckling protrusion 310 with the inner wall of the corresponding buckling groove 401, the cover plate 400 simultaneously limits and fixes the multiple spring sheets 300, that is, a connection mechanism 10 for power battery module free welding is used to fix one end of the multiple single cells 20; similarly, another connection mechanism 10 for power battery module free welding is used to fix the other end of the multiple single cells 20, thereby ensuring that the connection mechanism 10 for power battery module free welding can better firmly connect the multiple single cells 20 arranged in sequence to form a battery module.

[0039] For further information, see Figure 5 and Figure 6The welding-free connection mechanism 10 for the power battery module further includes a plurality of screws 500. An avoidance gap 21 is formed between any three adjacent single batteries 20 of the power battery module 10a. The first connecting piece 210 is formed with a plurality of first screw holes 2102. The plurality of first screw holes 2102 are connected with the plurality of avoidance gaps 21 in a one-to-one correspondence. The cover plate 400 is formed with a plurality of second screw holes 402. The plurality of second screw holes 402 are arranged in a one-to-one correspondence with the plurality of first screw holes 2102. Each of the screws 500 is sequentially penetrated through the corresponding avoidance gap 21 and the corresponding first screw hole 2102, and is screwed with the inner wall of the corresponding second screw hole 402. In the present embodiment, the connection mechanism 10 for power battery module free welding further includes a plurality of screws 500, and an avoidance gap 21 is formed between any three adjacent single cells 20 of the power battery module 10a, the first connecting sheet 210 is formed with a plurality of first screw holes 2102, and the cover plate 400 is formed with a plurality of second screw holes 402. Therefore, after fixing the two ends of the plurality of single cells 20 by two connection mechanisms 10 for power battery module free welding, along the axial direction of each single cell 20, each screw 500 is sequentially penetrated through the inner wall of the corresponding second screw hole 402, the inner wall of the corresponding first screw hole 2102, the corresponding avoidance gap 21 and the corresponding first screw hole 2102 in one connection mechanism 10 for power battery module free welding, and is screwed with the inner wall of the corresponding second screw hole 402 in another connection mechanism 10 for power battery module free welding, so as to lock the assembled battery module and ensure the reliability and stability of the battery module. It should be noted that, by providing the screw rod 500 , the power battery module 10 a can also be installed and fixed to a power vehicle or other electrical equipment, so as to facilitate installation or removal of the power battery module 10 a .

[0040] In one embodiment, the bracket is formed with a plurality of the through holes and a plurality of the sleeve cavities, and the plurality of the sleeve cavities are connected with the plurality of the through holes in a one-to-one correspondence; the first connecting piece abuts against the bracket, and the first connecting piece is formed with a plurality of the through holes, and the plurality of the through holes are connected with the plurality of the through holes in a one-to-one correspondence; the second connecting piece abuts against the first connecting piece, and the second connecting piece is provided with a plurality of the limiting protrusions, and the plurality of the limiting protrusions are arranged in a one-to-one correspondence with the plurality of the through holes, and each of the limiting protrusions is sequentially penetrated through the corresponding through hole and the corresponding through hole, the spring sheet is magnetically adsorbed on the second connecting piece, and a plurality of the buckling protrusions are provided on the side of the spring sheet facing away from the second connecting piece, and the cover plate is formed with a plurality of buckling grooves, and the plurality of the buckling protrusions are arranged in a one-to-one correspondence with the plurality of the buckling grooves, and each of the buckling protrusions is buckled and connected with the inner wall of the corresponding buckling groove.

[0041] In this embodiment, the bracket is formed with a plurality of through holes and a plurality of sleeve cavities, and the plurality of sleeve cavities are connected with the plurality of through holes in a one-to-one correspondence. The plurality of single cells are arranged in sequence, and the inner wall of each sleeve cavity is sleeved and connected to one end of each single cell to fix one end of each single cell. The first connecting piece is formed with a plurality of via holes, and the plurality of via holes are connected with the plurality of through holes in a one-to-one correspondence. The second connecting piece is abutted against the first connecting piece, and the second connecting piece is provided with a plurality of limiting protrusions. The limiting protrusions are sequentially inserted into the corresponding via holes and the corresponding through holes, so that each limiting protrusion abuts against the pole ear of the corresponding single cell. Then, the spring sheet is magnetically adsorbed on the second connecting piece, and a plurality of buckling protrusions are provided on the side of the spring sheet away from the second connecting piece, and the cover plate is formed with a plurality of buckling grooves, and each buckling protrusion is buckled and connected with the inner wall of the corresponding buckling groove, so that the connection mechanism for the power battery module free of welding fixes one end of each single cell. Similarly, another connection mechanism for the power battery module free of welding is used to fix the other end of each single cell to form a battery module.

[0042] In one embodiment, see Figure 3 The number of the buckling protrusions 310 is multiple, and the multiple buckling protrusions 310 are evenly distributed on the side of the spring sheet 300 away from the second connecting sheet 220, and each of the buckling protrusions 310 is buckled and connected with the inner wall of the buckling groove 401. In this way, by providing multiple buckling protrusions 310, a firm connection between the spring sheet 300 and the cover plate 400 is ensured.

[0043] In one embodiment, see Figure 3 Each of the buckling protrusions 310 is a claw-shaped structure, so that the connection firmness between the spring sheet 300 and the cover plate 400 is further improved.

[0044] In one embodiment, the limiting protrusion is stamped and formed on the second connecting piece.

[0045] In one embodiment, the second connecting piece is an iron sheet, and the spring sheet is a magnet, so that the second connecting piece and the spring sheet are magnetically attracted to each other.

[0046] In one embodiment, see Figure 2 The second connecting piece 220 is an iron sheet, and a magnet 320 is provided on one side of the spring sheet 300 adjacent to the second connecting piece 220 so that the spring sheet 300 is adsorbed and connected to the second connecting piece 220 .

[0047] See also Figure 4The present disclosure further provides a power battery module 10a, comprising a plurality of said single cells 20 and two connection mechanisms 10 for power battery module welding-free as described in any of the above embodiments, wherein the plurality of said single cells 20 are arranged in rows in sequence. It should be noted that the number of the single cells 20 is more than two, that is, there are at least two single cells 20 in the power battery module 10a.

[0048] Compared with the prior art, the present invention has the following advantages, including but not limited to:

[0049] 1. The traditional welding connection method of the battery module is cancelled, the investment of production resources is reduced, the cumbersome process of welding technology is omitted, the assembly of the battery module is simpler, and the production efficiency of the battery module is improved;

[0050] 2. Avoid failure problems caused by welding quality and ensure the reliability and stability of the battery module;

[0051] 3. Since the assembly and disassembly of the battery module is simpler, it is easy to maintain and replace the battery cells, which reduces the workload of the operator.

[0052] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A welding-free connection mechanism for a power battery module, characterized in that: include: The bracket is formed with a through hole and a sleeve cavity which are interconnected, and the inner wall of the sleeve cavity is sleeved and connected to one end of the single battery; A connecting piece assembly, comprising a first connecting piece and a second connecting piece, wherein the first connecting piece abuts against the bracket and is formed with a through hole communicating with the through hole, the second connecting piece abuts against the first connecting piece, and the second connecting piece is provided with a limiting protrusion, the limiting protrusion is sequentially penetrated through the through hole and the through hole, so that the limiting protrusion abuts against the pole ear of the single battery; A spring sheet, the spring sheet is magnetically adsorbed to a side of the second connecting sheet away from the first connecting sheet, and a buckling protrusion is provided on the side of the spring sheet away from the second connecting sheet; The cover plate is formed with a buckling groove, and the buckling protrusion is buckled and connected with the inner wall of the buckling groove.

2. The welding-free connection mechanism for power battery modules according to claim 1, characterized in that: The number of the bracket, the second connecting piece, and the spring sheet is multiple, and the multiple brackets are arranged in a one-to-one correspondence with the multiple single cells of the power battery module. The inner wall of the sleeve cavity of each bracket is sleeved and connected to one end of the corresponding single cell. The first connecting piece is formed with a plurality of vias, and the plurality of vias are connected with the through holes of the multiple brackets in a one-to-one correspondence; the plurality of second connecting pieces are arranged in a one-to-one correspondence with the plurality of vias, and the limiting protrusions of each second connecting piece are successively penetrated through the corresponding via holes and the corresponding through holes, the plurality of spring sheets are arranged in a one-to-one correspondence with the plurality of second connecting pieces, and each spring sheet is magnetically adsorbed on the corresponding second connecting piece, and the cover plate is formed with a plurality of buckling grooves, and the plurality of buckling grooves are arranged in a one-to-one correspondence with the buckling protrusions of the plurality of spring sheets, and each buckling protrusion is buckled and connected with the inner wall of the corresponding buckling groove.

3. The welding-free connection mechanism for power battery modules according to claim 2, characterized in that: It also includes multiple screws, and a avoidance gap is formed between any three adjacent single cells of the power battery module. The first connecting plate is formed with multiple first screw holes, and the multiple first screw holes are connected with the multiple avoidance gaps in a one-to-one correspondence. The cover plate is formed with multiple second screw holes, and the multiple second screw holes are arranged in a one-to-one correspondence with the multiple first screw holes. Each of the screws is sequentially inserted into the corresponding avoidance gap and the corresponding first screw hole, and is screwed with the inner wall of the corresponding second screw hole.

4. The welding-free connection mechanism for power battery modules according to claim 1, characterized in that: The bracket is formed with a plurality of the through holes and a plurality of the sleeve cavities, and the plurality of the sleeve cavities are connected with the plurality of the through holes in a one-to-one correspondence. The first connecting piece abuts against the bracket, and the first connecting piece is formed with a plurality of the through holes, and the plurality of the through holes are connected with the plurality of the through holes in a one-to-one correspondence. The second connecting piece abuts against the first connecting piece, and the second connecting piece is provided with a plurality of the limiting protrusions, and the plurality of the limiting protrusions are arranged in a one-to-one correspondence with the plurality of the through holes, and each of the limiting protrusions is sequentially penetrated through the corresponding through hole and the corresponding through hole, and the spring sheet is magnetically adsorbed on the second connecting piece, and a plurality of the buckling protrusions are provided on the side of the spring sheet facing away from the second connecting piece, and the cover plate is formed with a plurality of buckling grooves, and the plurality of the buckling protrusions are arranged in a one-to-one correspondence with the plurality of the buckling grooves, and each of the buckling protrusions is buckled and connected with the inner wall of the corresponding buckling groove.

5. The welding-free connection mechanism for power battery modules according to claim 1, characterized in that: There are multiple buckling protrusions, which are evenly distributed on the side of the spring sheet away from the second connecting sheet, and each buckling protrusion is buckled and connected to the inner wall of the buckling groove.

6. The welding-free connection mechanism for power battery modules according to claim 5, characterized in that: Each of the buckling protrusions is a claw-shaped structure.

7. The welding-free connection mechanism for power battery modules according to claim 1, characterized in that: The limiting protrusion is stamped and formed on the second connecting piece.

8. The welding-free connection mechanism for power battery modules according to claim 1, characterized in that: The second connecting piece is an iron piece, and the elastic piece is a magnet.

9. The welding-free connection mechanism for power battery modules according to claim 1, characterized in that: The second connecting piece is an iron piece, and a magnet is provided on a side of the spring piece adjacent to the second connecting piece so that the spring piece is adsorbed and connected to the second connecting piece.

10. A power battery module, characterized in that: It comprises a plurality of said single cells and two welding-free connection mechanisms for a power battery module as claimed in any one of claims 1 to 9, wherein the plurality of said single cells are arranged in rows in sequence.

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