Battery module fixing structure

Abstract

The utility model relates to a battery module fixing structure which is applied to the technical field of batteries, the battery module fixing structure comprises a bottom plate and a clamping piece, the bottom plate is used for bearing a battery module to be welded, and a limiting piece used for being matched with a lifting device is arranged on the bottom plate; the clamping piece is arranged on the bottom plate and used for fixing the battery module to be welded to the bottom plate. According to the battery module fixing structure, the to-be-welded battery module is stably clamped on the bottom plate through the clamping piece, the bottom plate is stably supported on the lifting device through the limiting piece, the bottom plate can be always kept in a static state relative to the lifting device in the process of synchronously ascending and descending along with the lifting device, and the welding quality of the battery module is improved. Therefore, the possibility that the to-be-welded battery module inclines in the lifting process is reduced, the possibility that a welding focus deviates or a gap is generated between a part of the battery pole and the busbar is reduced, and the welding quality of the battery module is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery module fixing structure. Background Art

[0002] A busbar is a conductive element made of metal, which is used to connect multiple battery cells in a battery module or connect a battery cell to an external circuit to transfer current from the battery cell to an external load, thereby realizing the overall power supply of the battery module.

[0003] In the related technology, laser welding is usually used to weld the busbar to the battery pole, and the busbar needs to be aligned and pressed against the battery pole before welding. During the welding process, in order to make the focus of the laser act on the position to be welded, there is a certain distance between the laser welding head and the busbar, that is, the focal length. In order to meet the requirements of the focal length and avoid interference between the welding tool and the laser welding head, the battery module is generally lifted to a certain height through a lifting device. However, the battery module is prone to tilt during the lifting process, causing the welding focus to shift or a gap between some battery poles and the busbar, making it difficult to ensure the welding quality of the battery module. Utility Model Content

[0004] Based on this, it is necessary to provide a battery module fixing structure to address the problem that the welding quality of the battery module is difficult to ensure due to welding focus offset or gaps between some battery posts and the busbar during the welding process of the busbar and the battery post.

[0005] In a first aspect, the present application provides a battery module fixing structure for cooperating with a lifting device, the battery module fixing structure comprising:

[0006] The bottom plate is used to receive and weld the battery module, and a limiting piece for cooperating with the lifting device is provided on the bottom plate;

[0007] The clamping piece is arranged on the bottom plate and is used to fix the battery module to be welded on the bottom plate.

[0008] In one embodiment, it further comprises a limiting member, the limiting member comprises a plurality of limiting grooves, the limiting grooves are arranged on a side of the bottom plate away from the battery module to be welded, and the limiting grooves are plugged and matched with the limiting columns on the lifting device; or,

[0009] The limiting member comprises a plurality of limiting columns, which are arranged on a side of the bottom plate away from the battery module to be welded, and the limiting columns are plugged into and matched with limiting grooves on the lifting device.

[0010] In one of the embodiments, the clamping member includes two clamping blocks arranged opposite to each other, the battery module to be welded is located between the two clamping blocks, and the clamping blocks are fixed to the bottom plate by a fixing member.

[0011] In one embodiment, the clamping block includes a first clamping block and a second clamping block connected to each other. The first clamping block is used to press against the battery module to be welded, and the second clamping block is fixed to the bottom plate through a fixing member.

[0012] In one embodiment, a plurality of supporting ribs are provided on the side wall of the bottom plate on one side of the battery module to be welded. A sliding channel is formed between two adjacent supporting ribs, and the clamping block is slidably connected to the sliding channel.

[0013] In one embodiment, both ends of the supporting rib are rounded.

[0014] In one embodiment, an auxiliary limiting component is provided on the bottom plate. The auxiliary limiting component is used to cooperate with the clamping member to clamp the battery module to be welded.

[0015] In one embodiment, the auxiliary limiting component includes:

[0016] A limiting block with a groove provided thereon;

[0017] A connecting rod slidably disposed in the groove;

[0018] A pressing block provided at one end of the connecting rod extending out of the groove. The pressing block is used to press against the battery module to be welded;

[0019] An adjusting member provided on the limiting block. The adjusting member is used to drive the connecting rod to slide in the groove so as to realize the pressing and releasing of the pressing block against the battery module to be welded.

[0020] In one embodiment, the adjusting member includes an adjusting screw rod rotatably connected in the groove. The adjusting screw rod penetrates through the side wall of the connecting rod and is threadedly connected to the connecting rod. One end of the adjusting screw rod extends out of the groove, and a driving member for driving the rotation of the adjusting screw rod is provided at the end of the adjusting screw rod extending out of the groove.

[0021] In one embodiment, the driving member includes a rotary cover rotatably connected to the side wall of the limiting block on the side away from the battery module to be welded.

[0022] The above battery module fixing structure includes a bottom plate and a clamping member. The bottom plate is used to support the battery module to be welded, and a limiting member for cooperating with a lifting device is provided on the bottom plate; the clamping member is arranged on the bottom plate and is used to fix the battery module to be welded on the bottom plate. In the battery module fixing structure of the present application, the clamping member is used to stably clamp the battery module to be welded on the bottom plate, so that the battery module to be welded and the bottom plate can always maintain a relatively static state. And the limiting member is used to stably support the bottom plate on the lifting device, which helps to keep the bottom plate in a relatively static state with the lifting device during the synchronous lifting and lowering process of the bottom plate following the lifting device. Thus, during the lifting and lowering process of the battery module to be welded, it can always maintain a relatively static state with the lifting device, which helps to reduce the possibility of the battery module to be welded tilting during the lifting and lowering process, that is, it helps to reduce the possibility of the welding focus shifting or gaps being generated between some battery poles and the bus bar, thereby ensuring the welding quality of the battery module. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Structural schematic diagram of the battery module fixing structure in some embodiments of the present application;

[0025] Figure 2 For showing Figure 1 Enlarged schematic diagram of part A in

[0026] Figure 3 For showing Figure 1 Enlarged schematic diagram of part B in

[0027] Figure 4 Structural schematic diagram for showing the connection relationship between the bottom plate and the limiting member in some embodiments of the present application.

[0028] Explanation of the reference numerals in the drawings:

[0029] 100, bottom plate; 110, limiting member; 120, support rib; 130, sliding channel; 200, battery module to be welded; 210, battery cell; 220, battery pole; 230, bus bar; 240, end plate; 250, binding band; 300, clamping block; 310, fixing member; 400, auxiliary limiting assembly; 410, limiting block; 420, groove; 430, connecting rod; 440, pressing block; 450, adjusting screw; 460, screw cap. Detailed Embodiments

[0030] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the orientation or positional relationships indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0033] In the present application, unless otherwise clearly defined and limited, terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0034] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0036] To solve the problem in the related art that it is difficult to ensure the welding quality of the battery module due to the deviation of the welding focus or the existence of gaps between some battery terminals and the busbar during the welding process of the busbar and the battery terminal, on the one hand, referring to Figures 1 to 3 , an embodiment of the present application provides a battery module fixing structure, including a bottom plate 100 and a clamping member. The bottom plate 100 is used to carry the battery module 200 to be welded, and a limiting member 110 for cooperating with the lifting device is provided on the bottom plate 100; the clamping member is disposed on the bottom plate 100, and the clamping member is used to fix the battery module 200 to be welded on the bottom plate 100.

[0037] Wherein, the battery module 200 to be welded includes a plurality of battery cells 210 stacked in sequence, end plates 240 are provided at both ends of the battery module 200 to be welded, and a binding band 250 for fixing the battery cells 210 and the end plates 240 is wound around between the two end plates 240.

[0038] Specifically, before welding the battery terminal 220 on the battery module 200 to be welded with the busbar 230, the worker first places the busbar 230 on the top wall of the battery module 200 to be welded, and makes the busbar 230 and the battery terminal 220 in plug-in fit, then places the battery module 200 to be welded on the upper surface of the bottom plate 100, and then uses the clamping member to stably clamp the battery module 200 to be welded, so that the battery module 200 to be welded is difficult to displace in the horizontal direction. The clamping member can clamp and limit the battery module 200 to be welded along the length direction of the battery module 200 to be welded, or can also clamp and limit the battery module 200 to be welded along the width direction of the battery module 200 to be welded.

[0039] In this embodiment, the clamping member is used to stably clamp the battery module 200 to be welded on the bottom plate 100, so that the battery module 200 to be welded and the bottom plate 100 can always maintain a relatively static state. And the limiting member 110 is used to stably support the bottom plate 100 on the lifting device, which helps to keep the bottom plate 100 in a relatively static state with the lifting device during the synchronous lifting and lowering process with the lifting device. Thus, during the lifting and lowering process of the battery module 200 to be welded, it can always maintain a relatively static state with the lifting device, which helps to reduce the possibility of the battery module 200 to be welded tilting during the lifting and lowering process, that is, it helps to reduce the possibility of the welding focus shifting or a gap being generated between some battery poles 220 and the bus bar 230, thereby ensuring the welding quality of the battery module.

[0040] Referring to Figure 4 , in some embodiments, the battery module fixing structure further includes a limiting member. The limiting member 110 includes a plurality of limiting grooves, and the limiting grooves are arranged on the side of the bottom plate 100 facing away from the battery module 200 to be welded. The limiting grooves are in plug-in fit with the limiting posts 412 on the lifting device; or,

[0041] The limiting member 110 includes a plurality of limiting posts 412, and the limiting posts 412 are arranged on the side of the bottom plate 100 facing away from the battery module 200 to be welded. The limiting posts 412 are in plug-in fit with the limiting grooves on the lifting device.

[0042] Specifically, after the worker fixes the battery module 200 to be welded on the bottom plate 100, through the plug-in fit between the limiting groove and the limiting post 412, it is difficult for the bottom plate 100 to displace in the horizontal direction, thereby achieving the effect of stably limiting the bottom plate 100 on the lifting device.

[0043] In this embodiment, through the plug-in fit between the limiting groove and the limiting post 412, the limiting of the bottom plate 100 in the horizontal direction is realized, so as to realize the limiting of the battery module fixing structure, and the structure is simple and easy to operate.

[0044] Referring to Figure 1 and Figure 2 , in some embodiments, the clamping member includes two relatively arranged clamping blocks 300, the battery module 200 to be welded is located between the two clamping blocks 300, and the clamping blocks 300 are fixed on the bottom plate 100 through fixing members 310.

[0045] Among them, the clamping block 300 includes a first clamping block and a second clamping block. The first clamping block is used to tightly press against the battery module 200 to be welded, and the second clamping block is fixed to the bottom plate 100 through a fixing member 310. In this embodiment, the first clamping block is a vertical block, and the second clamping block is a horizontal block, that is, the longitudinal section of the clamping block 300 in this embodiment is L-shaped. The fixing member 310 includes a bolt, and the bolt passes through the second clamping block and is threadedly connected to the bottom plate 100, thereby realizing the fixation of the clamping block 300, and further realizing that the clamping blocks 300 located on both sides of the battery module 200 to be welded can clamp the battery module 200 to be welded.

[0046] Specifically, after the worker places the battery module 200 to be welded on the bottom plate 100, one of the clamping blocks 300 is tightly pressed against one end plate 240 of the battery module 200 to be welded, and the other clamping block 300 is tightly pressed against the other end plate 240 of the battery module 200 to be welded. Then, the clamping block 300 is fixed to the bottom plate 100 through a bolt, so as to stably clamp the battery module 200 to be welded between the two clamping blocks 300.

[0047] In this embodiment, through the cooperation of the clamping block 300 and the fixing member 310, it is helpful to stably fix the battery module 200 to be welded on the bottom plate 100, and the structure is simple and easy to operate.

[0048] Refer to Figure 1 , in some embodiments, a plurality of support ribs 120 are provided on the side wall of the bottom plate 100 on one side of the battery module 200 to be welded. A sliding channel 130 is formed between two adjacent support ribs 120, and the clamping block 300 is slidably connected to the sliding channel 130.

[0049] Among them, the support ribs 120 are arranged in an array along the width direction of the bottom plate 100, that is, the length direction of the support ribs 120 is parallel to the length direction of the bottom plate 100. Since the top wall of the support ribs 120 protrudes from the surface of the bottom plate 100, a sliding channel 130 can be formed between two adjacent support ribs 120, and the bottom end of the clamping block 300 is slidably connected to the sliding channel 130. The two ends of the support ribs 120 are rounded, which can reduce the possibility of the battery module 200 to be welded being damaged by rubbing against the support ribs 120 when placed on the support ribs 120, thereby playing a certain protective role for the battery module 200 to be welded.

[0050] Specifically, since the sizes of the battery modules 200 to be welded in different production batches may be inconsistent, the sliding channel 130 formed by the support ribs 120 can be used to select the installation position of the clamping block 300 according to the width of the battery module 200 to be welded. And through the cooperation of the sliding channel 130 and the clamping block 300, it is convenient for the worker to adjust the placement position of the battery module 200 to be welded, so as to ensure the regularity when the battery module 200 to be welded is fixed on the bottom plate 100.

[0051] In this embodiment, the sliding channel 130 formed by the supporting ribs 120 facilitates the worker to determine the placement position of the clamping block 300 according to the size of the battery module 200 to be welded, so as to ensure the pressing effect of the clamping block 300 on the battery module; and it helps to improve the adaptability of the battery module fixing structure and the flexibility during use.

[0052] Refer to Figure 1 , in some embodiments, an auxiliary limiting component 400 is provided on the bottom plate 100, and the auxiliary limiting component 400 is used to cooperate with the clamping member to clamp the battery module 200 to be welded.

[0053] Among them, according to the above content, by using the cooperation of the clamping block 300 and the fixing member 310, the battery module 200 to be welded can be pressed in the length direction or the width direction. However, in order to ensure the stability of the battery module 200 to be welded fixed on the bottom plate 100, the auxiliary limiting component 400 is provided to cooperate with the clamping block 300 to further limit the battery module 200 to be welded.

[0054] Specifically, in this embodiment, two clamping blocks 300 are respectively pressed against the corresponding end plates 240, and the auxiliary limiting component 400 is arranged on both sides in the length direction of the battery module 200 to be welded to press against both side walls of the battery module 200 to be welded adjacent to the end plates 240.

[0055] Refer to Figure 1 and Figure 3 , in some embodiments, the auxiliary limiting component 400 includes a limiting block 410, a connecting rod 430, a pressing block 440 and an adjusting member. A groove 420 is provided on the limiting block 410, and one side of the groove 420 is open. The connecting rod 430 is slidably arranged in the groove 420. The pressing block 440 is fixedly connected to the side wall of one end of the connecting rod 430 extending out of the open end of the groove 420. The adjusting member is arranged on the limiting block 410, and the adjusting member is used to drive the connecting rod 430 to slide in the groove 420 to realize the pressing and releasing of the pressing block 440 on the battery module 200 to be welded.

[0056] Among them, the length direction of the groove 420 is consistent with the sliding direction of the connecting rod 430, and the sliding direction of the connecting rod 430 is perpendicular to the length direction of the sliding channel 130. The top end of the pressing block 440 is also rounded, which can play a certain role in protecting the battery module 200 to be welded from being scratched when pressing against the side wall of the battery module 200 to be welded. The auxiliary limiting component 400 is arranged on both sides in the length direction of the supporting rib 120. In this embodiment, the number of the auxiliary limiting components 400 on each side is taken as two for example.

[0057] Specifically, after the battery module 200 to be welded is placed on the supporting rib 120, first, through the cooperation of the clamping block 300 and the fixing member 310, the limiting of the battery module 200 to be welded in the length direction of the battery module 200 to be welded is realized. Then, the adjusting member is used to drive the connecting rod 430 to move towards the side of the battery module 200 to be welded until the abutting block 440 abuts against the side wall of the battery module 200 to be welded, so as to ensure the stability of the battery module 200 to be welded during the subsequent welding process. When the battery module 200 to be welded is welded, the adjusting member is used to drive the connecting rod 430 to move away from the side of the battery module 200 to be welded, so that the abutting block 440 is separated from the battery module 200 to be welded, and then the fixing member 310 is released, so that the clamping block 300 is also separated from the battery module 200 to be welded, thereby realizing the complete release of the battery module 200 to be welded after welding.

[0058] In the battery module fixing structure of this embodiment, through the cooperation of the clamping block 300, the fixing member 310 and the auxiliary limiting component 400, the stable limiting of the battery module 200 to be welded in the horizontal direction is realized, and through the cooperation of the limiting member 110 and the lifting device, it is helpful to improve the stability of the bottom plate 100 after being installed on the lifting device, so that during the process of the battery module 200 to be welded rising and falling synchronously with the lifting device, it can always maintain a relatively static state with the bottom plate 100 and the lifting device, thereby helping to reduce the possibility of the battery module 200 to be welded tilting during the lifting process, that is, helping to reduce the possibility of the welding focus shifting or a gap being generated between some battery poles 220 and the bus bar 230, and further ensuring the welding quality of the battery module.

[0059] Refer to Figure 1 and Figure 3 In some embodiments, the adjusting member includes an adjusting screw 450. The adjusting screw 450 is rotatably connected in the groove 420, the adjusting screw 450 penetrates through the side wall of the connecting rod 430 and is threadedly connected to the connecting rod 430. One end of the adjusting screw 450 extends out of the groove 420, and a driving member for driving the adjusting screw 450 to rotate is provided at the end of the adjusting screw 450 extending out of the groove 420.

[0060] Specifically, the length direction of the adjusting screw 450 is parallel to the length direction of the groove 420. When the worker needs to use the abutting block 440 to abut against both sides of the battery module 200 to be welded, the driving member is used to drive the adjusting screw 450 to rotate, so that the connecting rod 430 slides towards the side of the battery module 200 to be welded in the groove 420 under the action of screw feeding until the abutting block 440 abuts against the side wall of the battery module 200 to be welded. When it is necessary to release the battery module 200 to be welded, the driving member is used to drive the adjusting screw 450 to rotate in the reverse direction, so that the abutting block 440 moves away from the side of the battery module 200 to be welded, thereby realizing the separation of the abutting block 440 from the battery module 200 to be welded.

[0061] In this embodiment, the cooperation between the driving member and the adjusting screw rod 450 helps to quickly realize the reciprocating movement of the pressing block 440 along the length direction of the groove 420, so that it is convenient for workers to quickly lock and release the battery module 200 to be welded, and the structure is simple and easy to operate.

[0062] Referring Figure 1 and 3 , in some embodiments, the driving member includes a rotary cover 460, and the rotary cover 460 is rotatably connected to the side wall of the limiting block 410 away from the battery module 200 to be welded.

[0063] Specifically, a number of anti-slip threads are provided on the outer peripheral side of the rotary cover 460, which is convenient for workers to screw. And setting the rotary cover 460 to be rotatably connected to the limiting block 410 can play a certain limiting role in the rotation of the adjusting screw rod 450, reducing the possibility of slipping and rotating after the rotation of the adjusting screw rod 450, so as to ensure the stability and reliability when the pressing block 440 presses the battery module 200 to be welded.

[0064] In this embodiment, by screwing the rotary cover 460 to drive the adjusting screw rod 450 to rotate synchronously, under the action of thread feeding, the reciprocating movement of the pressing block 440 can be quickly realized, the structure is simple and easy to operate; and it helps to ensure the stability and reliability when the pressing block 440 presses the battery module 200 to be welded.

[0065] In the battery module fixing structure of the present application, through the cooperation of the clamping block 300 and the fixing member 310, stable limiting of the battery module 200 to be welded in the length direction of the bottom plate 100 can be realized. Through the cooperation of the limiting block 410, the rotary cover 460, the adjusting screw rod 450, the connecting rod 430 and the pressing block 440, stable limiting of the battery module 200 to be welded in the width direction of the bottom plate 100 can be realized, so as to realize stable limiting of the battery module 200 to be welded in the horizontal direction. And through the cooperation of the limiting member 110 and the lifting device, it helps to improve the stability of the bottom plate 100 after being installed on the lifting device, so that during the process of the battery module 200 to be welded rising and falling synchronously with the lifting device, it can always maintain a relatively static state with the bottom plate 100 and the lifting device, thus helping to reduce the possibility of the battery module 200 to be welded tilting during the lifting process, that is, helping to reduce the possibility of the welding focus shifting or gaps being generated between some battery poles 220 and the bus bar 230, and further ensuring the welding quality of the battery module.

[0066] In the description of this specification, the description referring to terms such as "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or features described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0067] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0068] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A battery module fixing structure for cooperating with a lifting device, characterized in that, The battery module fixing structure comprises: A bottom plate, the bottom plate is used to receive the battery module for front welding, and the bottom plate is provided with a limiting member for cooperating with the lifting device; The clamping piece is arranged on the bottom plate, and is used to fix the battery module to be welded on the bottom plate.

2. The battery module fixing structure according to claim 1, wherein, It also includes a limiting member, the limiting member includes a plurality of limiting grooves, the limiting grooves are arranged on a side of the bottom plate away from the battery module to be welded, and the limiting grooves are plugged and matched with the limiting columns on the lifting device; or, The limiting member includes a plurality of limiting posts, which are arranged on a side of the bottom plate away from the battery module to be welded, and the limiting posts are plugged into and matched with limiting grooves on the lifting device.

3. The battery module fixing structure according to claim 1, wherein The clamping member comprises two clamping blocks arranged opposite to each other, the battery module to be welded is located between the two clamping blocks, and the clamping blocks are fixed to the bottom plate via fixing members.

4. The battery module fixing structure according to claim 3, characterized in that, The clamping block includes a first clamping block and a second clamping block connected to each other, wherein the first clamping block is used to clamp the battery module to be welded, and the second clamping block is fixed to the bottom plate via a fixing member.

5. The battery module fixing structure according to claim 3, wherein, The side wall of the bottom plate located on one side of the battery module to be welded is provided with a plurality of supporting ribs, a sliding channel is formed between two adjacent supporting ribs, and the clamping block is slidingly connected to the sliding channel.

6. The battery module fixing structure according to claim 5, wherein, Both ends of the supporting rib are arranged with rounded corners.

7. The battery module fixing structure according to claim 1, characterized in that, An auxiliary limiting assembly is provided on the bottom plate, and the auxiliary limiting assembly is used to cooperate with the clamping member to clamp the battery module to be welded.

8. The battery module fixing structure according to claim 7, characterized in that, The auxiliary limiting component comprises: A limit block, wherein a groove is provided on the limit block; A connecting rod, slidably disposed in the groove; A tightening block, arranged at one end of the connecting rod extending out of the groove, the tightening block being used to tighten against the battery module to be welded; An adjusting member is arranged on the limiting block, and is used to drive the connecting rod to slide in the groove to achieve the tightening and release of the tightening block on the battery module to be welded.

9. The battery module fixing structure according to claim 8, wherein, The adjusting member includes an adjusting screw, which is rotatably connected in the groove, passes through the side wall of the connecting rod and is threadedly connected to the connecting rod, one end of the adjusting screw extends out of the groove, and the end of the adjusting screw extending out of the groove is provided with a driving member for driving the adjusting screw to rotate.

10. The battery module fixing structure according to claim 9, characterized in that, The driving member comprises a rotary cover, and the rotary cover is rotatably connected to a side wall of the limiting block on a side away from the battery module to be welded.

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