Battery welding fixture and equipment thereof

Abstract

The utility model provides a battery welding clamp and equipment thereof. The battery welding clamp comprises a first driving and pressing assembly and a second driving and pressing assembly. The first driving and pressing assembly comprises a first driving piece and a first pressing assembly movably connected with the first driving piece, and the first pressing assembly comprises a first pressing part; the second driving and pressing assembly comprises a second driving piece and a second pressing assembly movably connected with the second driving piece, the second pressing assembly comprises a second pressing part, the first pressing part is provided with a first cooling flow channel cavity, and the second pressing part is provided with a second cooling flow channel cavity; the first cooling flow channel cavity and the second cooling flow channel cavity are both communicated with a cooling water circulation system of the cooling-water machine. According to the battery welding clamp, the situation that the battery shell cover warps in the laser welding process can be effectively prevented, meanwhile, the situation that the battery shell cover deforms due to overheating can be avoided, and therefore the flatness of the battery shell cover after the whole battery shell cover is welded and fixed is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy battery processing, in particular to a battery welding fixture and equipment thereof. Background Art

[0002] During the production process of lithium-ion batteries, especially during the packaging stage of lithium-ion batteries, laser welding is required to weld the battery shell cover to the shell opening of the battery shell along its circumferential welding path to achieve the ultimate protection of the battery cell and prevent leakage.

[0003] Among them, due to the thin thickness of the battery shell cover, the battery shell cover usually has such problems during the laser welding process: the part of the battery shell cover that has not been welded to the battery shell is warped relative to the welded part, and the battery shell cover welding position or welding path has overheating and deformation problems, which will undoubtedly make it difficult to control the flatness of the battery shell cover after the entire welding is fixed. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a battery welding fixture and equipment that can avoid the problems of warping and thermal deformation of the battery shell cover during laser welding, thereby effectively improving the flatness of the battery shell cover after overall welding and fixation.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] a first driving and pressing assembly, the first driving and pressing assembly comprising a first driving member and a first pressing assembly movably connected thereto, the first pressing assembly comprising a first pressing portion, and when in a first working state, the first driving member drives the first pressing portion to press the battery shell cover and the battery shell having at least one open end, so that the battery shell cover is fixed to the opening of the battery shell;

[0007] A second driving and clamping assembly, the second driving and clamping assembly includes a second driving member and a second clamping assembly movably connected thereto, the second clamping assembly includes a second clamping portion, when in the second working state, the second driving member drives the second clamping portion to clamp the battery shell cover and the battery shell with at least one end open, so that the battery shell cover is fixed to the opening of the battery shell; the first clamping portion is provided with a first cooling flow channel cavity, the second clamping portion is provided with a second cooling flow channel cavity, the first cooling flow channel cavity and the second cooling flow channel cavity are both connected to the cooling water circulation system of the chiller.

[0008] In one embodiment, the first driving and pressing assembly further includes a first electric slide rail; the first electric slide rail is provided on one side of the battery housing, the first driving member is fixedly mounted on a sliding end of the first electric slide rail, and the first electric slide rail is used to drive the first driving member to perform horizontal movement;

[0009] The first clamping assembly also includes a first connecting rod; the outer peripheral wall of the first clamping part is formed with a first air avoidance slope, the first air avoidance slope is used to avoid the laser beam emitted by the laser welding machine, and the first clamping part is located above the battery shell cover; one end of the first connecting rod is connected to the movable telescopic end of the first driving member, and the other end of the first connecting rod is connected to the first clamping part, and the first driving member is used to drive the first clamping part to move vertically.

[0010] In one embodiment, the first driving member is a telescopic air cylinder, a telescopic electric cylinder or a telescopic hydraulic cylinder.

[0011] In one embodiment, the second driving and pressing assembly further includes a second electric slide rail; the second electric slide rail is provided on the other side of the battery housing, the second driving member is fixedly mounted on a sliding end of the second electric slide rail, and the second electric slide rail is used to drive the second driving member to move horizontally;

[0012] The second clamping assembly also includes a second connecting rod; the outer peripheral wall of the second clamping part is formed with a second air avoidance slope, the second air avoidance slope is used to avoid the laser beam emitted by the laser welding machine, and the second clamping part is located above the battery shell cover; one end of the second connecting rod is connected to the movable telescopic end of the second driving member, and the other end of the second connecting rod is connected to the second clamping part, and the second driving member is used to drive the second clamping part to move vertically.

[0013] In one embodiment, the second driving member is a telescopic air cylinder, a telescopic electric cylinder or a telescopic hydraulic cylinder.

[0014] In one embodiment, the first air-avoiding inclined surface and the second air-avoiding inclined surface respectively form a preset angle with the horizontal plane, and the angle range of the preset angle is 30 degrees to 60 degrees.

[0015] In one embodiment, the first cooling channel cavity and the second cooling channel cavity are linear cooling channel cavities.

[0016] In one embodiment, the water inlet and the water outlet of the first cooling channel cavity are respectively provided with a first connecting water nozzle, and the first connecting water nozzle is used to be detachably connected to the water inlet or the water outlet of the first cooling channel cavity;

[0017] The water inlet and water outlet of the second cooling channel cavity are respectively provided with a second connecting water nozzle, and the second connecting water nozzle is used to be detachably connected to the water inlet or the water outlet of the second cooling channel cavity.

[0018] A battery welding device comprises the battery welding fixture and the laser welding machine described in any one of the above embodiments.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] 1. The first pressing part can be driven to move by the first driving member until the first pressing part presses the battery shell cover and the battery shell with at least one end open; similarly, the second pressing part can be driven to move by the second driving member until the second pressing part presses the battery shell cover and the battery shell with at least one end open, so that the first pressing part and the second pressing part can alternately press the battery shell cover in sequence, so that the battery shell cover is laser welded along its circumferential welding path, thereby effectively preventing the battery shell cover from warping during the laser welding process.

[0021] 2. Since the first cooling channel cavity and the second cooling channel cavity are both connected to the cooling water circulation system of the chiller, the chiller can supply circulating cooling water to the first pressing part and the second pressing part, so that the first pressing part and the second pressing part can transfer the excess heat of the battery shell cover along the welding path to the circulating cooling water in the first cooling channel cavity and the second cooling channel cavity respectively through heat transfer, thereby reducing the laser heat on the battery shell cover along its circumferential welding path, avoiding overheating and deformation of the battery shell cover, and effectively improving the flatness of the battery shell cover after overall welding and fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A cross-sectional view of the structure of a battery welding fixture in one embodiment;

[0024] Figure 2 for Figure 1 A top view of the first driving and pressing assembly of the battery welding fixture;

[0025] Figure 3 for Figure 1 A top view of the second driving and pressing assembly of the battery welding fixture;

[0026] Figure markings: battery welding fixture 10; battery shell cover 100; first non-contact surface 101; second non-contact surface 102; battery shell 200; first drive clamping assembly 300; first drive member 310; first clamping assembly 320; first clamping portion 3210; first cooling flow channel cavity 3212; first air avoidance slope 3214; first connecting rod 3220; first electric slide rail 330; second drive clamping assembly 400; second drive member 410; second clamping assembly 420; second clamping portion 4210; second cooling flow channel cavity 4212; second air avoidance slope 4214; second connecting rod 4220; second electric slide rail 430; laser beam 500. DETAILED DESCRIPTION

[0027] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended solely for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] See also Figures 1 to 3 In order to better understand the battery welding fixture 10 of the present application, the battery welding fixture 10 is further explained below:

[0031] A battery welding fixture 10 of one embodiment includes a first drive and clamping assembly 300 and a second drive and clamping assembly 400. The first drive and clamping assembly 300 includes a first drive member 310 and a first clamping assembly 320 movably connected thereto, the first clamping assembly 320 includes a first clamping portion 3210. When in a first working state, the first drive member 310 drives the first clamping portion 3210 to clamp the battery shell cover 100 and the battery shell 200 with at least one end open, so that the battery shell cover 100 is fixed to the opening of the battery shell 200; the second drive and clamping assembly 400 includes a second drive member 410 and a second clamping assembly 420 movably connected thereto, the second clamping assembly 420 includes a second pressing part 4210. When in the second working state, the second driving member 410 drives the second pressing part 4210 to press the battery shell cover 100 and the battery shell 200 with at least one end open, so that the battery shell cover 100 is fixed to the opening of the battery shell 200; the first pressing part 3210 is provided with a first cooling flow channel cavity 3212, and the second pressing part 4210 is provided with a second cooling flow channel cavity 4212. The first cooling flow channel cavity 3212 and the second cooling flow channel cavity 4212 are both connected to the cooling water circulation system of the chiller.

[0032] In this embodiment, the first pressing portion 3210 can be driven to move by the first driving member 310 until the first pressing portion 3210 presses the battery shell cover 100 and the battery shell 200 with at least one end open; similarly, the second pressing portion 4210 can be driven to move by the second driving member 410 until the second pressing portion 4210 presses the battery shell cover 100 and the battery shell 200 with at least one end open, so that the first pressing portion 3210 and the second pressing portion 4210 can alternately press the battery shell cover 100 in sequence, so that the battery shell cover 100 completes laser welding along its circumferential welding path, thereby effectively preventing the battery shell cover 100 from warping during the laser welding process.

[0033] Furthermore, since the first cooling channel cavity 3212 and the second cooling channel cavity 4212 are both connected to the cooling water circulation system of the chiller, the chiller can supply circulating cooling water to the first pressing part 3210 and the second pressing part 4210, so that the first pressing part 3210 and the second pressing part 4210 can transfer excess heat of the battery shell cover 100 along the welding path to the circulating cooling water in the first cooling channel cavity 3212 and the second cooling channel cavity 4212 respectively through heat transfer, thereby reducing the laser heat of the battery shell cover 100 along its circumferential welding path, avoiding overheating and deformation of the battery shell cover 100, and effectively improving the flatness of the battery shell cover 100 after overall welding and fixation.

[0034] It should be noted that in this embodiment, the temperature range of the circulating cooling water in the first cooling channel cavity 3212 and the second cooling channel cavity 4212 is 21 degrees to 28 degrees. Of course, this is not limited here, and those skilled in the art can also make other choices as needed.

[0035] It should be noted that when the first driving member 310 drives the first pressing part 3210 to press the battery shell cover 100, the battery welding fixture 10 is in the first working state; on the contrary, when the second driving member 410 drives the second pressing part 4210 to press the battery shell cover 100, the battery welding fixture 10 is in the second working state.

[0036] like Figure 1 and Figure 2 As shown, in one embodiment, the first driving and clamping assembly 300 also includes a first electric slide rail 330; the first electric slide rail 330 is arranged on one side of the battery shell 200, and the first driving member 310 is fixedly mounted on the sliding end of the first electric slide rail 330, and the first electric slide rail 330 is used to drive the first driving member 310 to move horizontally; the first clamping assembly 320 also includes a first connecting rod 3220; the outer peripheral wall of the first clamping part 3210 is formed with a first air avoidance slope 3214, and the first air avoidance slope 3214 is used to avoid the laser beam 500 emitted by the laser welding machine, and the first clamping part 3210 is located above the battery shell cover 100; one end of the first connecting rod 3220 is connected to the movable telescopic end of the first driving member 310, and the other end of the first connecting rod 3220 is connected to the first clamping part 3210, and the first driving member 310 is used to drive the first clamping part 3210 to move vertically.

[0037] It can be understood that in this embodiment, the first clamping portion 3210 is connected to the first driving member 310 through the first connecting rod 3220, and the first driving member 310 is driven to move horizontally by the first electric slide rail 330, so that the first clamping portion 3210 moves to directly above the battery shell cover 100, and then the first connecting rod 3220 is driven down by the first driving member 310, so that the bottom surface of the first clamping portion 3210 abuts against and clamps the top surface of the battery shell cover 100, so that the battery shell cover 100 forms a first non-contact surface 101 along the circumferential direction, so that the laser welding machine first performs spot welding and full welding operations on the first non-contact surface 101.

[0038] It should be noted that the width of the first non-contact surface 101 is 1 mm to 2 mm.

[0039] like Figure 1As shown, in one embodiment, the first driving member 310 is a telescopic cylinder, a telescopic electric cylinder or a telescopic hydraulic cylinder. Of course, this is not limited here, and those skilled in the art can also make other choices as needed.

[0040] like Figures 1 to 3 As shown, in one embodiment, the second driving and clamping assembly 400 also includes a second electric slide rail 430; the second electric slide rail 430 is arranged on the other side of the battery shell 200, and the second driving member 410 is fixedly mounted on the sliding end of the second electric slide rail 430, and the second electric slide rail 430 is used to drive the second driving member 410 to move horizontally; the second clamping assembly 420 also includes a second connecting rod 4220; the outer peripheral wall of the second clamping part 4210 is formed with a second air avoidance slope 4214, and the second air avoidance slope 4214 is used to avoid the laser beam 500 emitted by the laser welding machine, and the second clamping part 4210 is located above the battery shell cover 100; one end of the second connecting rod 4220 is connected to the movable telescopic end of the second driving member 410, and the other end of the second connecting rod 4220 is connected to the second clamping part 4210, and the second driving member 410 is used to drive the second clamping part 4210 to move vertically.

[0041] It can be understood that in this embodiment, when the welding operation of the first non-contact surface 101 is completed and the first clamping part 3210 is reset, the second driving member 410 is driven by the second electric slide rail 430 to move horizontally, so that the second clamping part 4210 moves to directly above the battery shell cover 100, and then the first connecting rod 3220 is driven to descend by the second driving member 410, so that the bottom surface of the second clamping part 4210 abuts against and clamps the top surface of the battery shell cover 100, so that the second non-contact surface 102 is formed along the circumference of the battery shell cover 100, so that the laser welding machine can directly perform full welding operation on the second non-contact surface 102.

[0042] Among them, the first non-contact surface 101 is connected to the second non-contact surface 102 to form a welding closed loop along the circumference of the battery shell cover 100. This not only effectively improves the flatness of the battery shell cover 100 after overall welding and fixation, but also better ensures the sealing of the battery shell cover 100 welded to the shell opening of the battery shell 200, thereby avoiding the problem of leakage of the lithium-ion battery.

[0043] It should be noted that the width of the second non-contact surface 102 is also 1 mm to 2 mm.

[0044] like Figure 1 As shown, in one embodiment, the second driving member 410 is a telescopic cylinder, a telescopic electric cylinder or a telescopic hydraulic cylinder. Of course, this is not limited here, and those skilled in the art can also make other choices as needed.

[0045] like Figures 1 to 3 As shown, in one embodiment, the first air-avoiding inclined surface 3214 and the second air-avoiding inclined surface 4214 respectively form a preset angle with the horizontal plane, and the angle range of the preset angle is 30 degrees to 60 degrees.

[0046] It should be noted that the preset angle is Figure 1 As shown in the middle angle A; and, the laser beam 500 emitted by the laser welding machine is emitted from top to bottom.

[0047] It can be understood that in this embodiment, the user can obtain the first air avoidance slope 3214 or the second air avoidance slope 4214 with different degrees of inclination by setting an appropriate preset angle to avoid the laser beam 500 from accidentally irradiating the first pressing part 3210 or the second pressing part 4210, so that the path through which the laser beam 500 emitted by the laser welding machine can pass has more selectivity and flexibility, thereby better improving the quality of laser welding of the battery shell cover 100.

[0048] like Figure 2 and Figure 3 As shown, in one embodiment, the first cooling channel cavity 3212 and the second cooling channel cavity 4212 are linear cooling channel cavities, which facilitates the processing of the first cooling channel cavity 3212 and the second cooling channel cavity 4212.

[0049] like Figure 1 As shown, in one embodiment, the water inlet and outlet of the first cooling channel cavity 3212 are respectively provided with a first connecting water nozzle (not shown), and the first connecting water nozzle (not shown) is used to be detachably connected to the water inlet of the first cooling channel cavity 3212 or the water outlet of the first cooling channel cavity 3212; the water inlet and outlet of the second cooling channel cavity 4212 are respectively provided with a second connecting water nozzle (not shown), and the second connecting water nozzle (not shown) is used to be detachably connected to the water inlet of the second cooling channel cavity 4212 or the water outlet of the second cooling channel cavity 4212. In this way, by providing the first connecting water nozzle (not shown) and the second connecting water nozzle (not shown), it is convenient to connect the connecting pipe (not shown) of the chiller with the corresponding first connecting water nozzle (not shown) and the second connecting water nozzle (not shown), and it is also convenient to disassemble and assemble the first connecting water nozzle (not shown) and the second connecting water nozzle (not shown).

[0050] The working principle of the battery welding fixture 10 is as follows:

[0051] The working principle of the first driving and clamping assembly 300: First, the first electric slide rail 330 drives the first driving member 310 to move horizontally close to one side of the battery shell 200, so that the first clamping part 3210 is directly above the battery shell cover 100; secondly, the first driving member 310 drives the first clamping part 3210 to move downward, and the bottom surface of the first clamping part 3210 abuts against the top surface of the battery shell cover 100; finally, the laser welding machine performs spot welding and full welding operations on the first non-contact surface 101 in sequence. When the laser welding of the first non-contact surface 101 is completed, the first driving member 310 and the first clamping assembly 320 perform reset actions respectively, and finally the first clamping part 3210 leaves the top of the battery shell cover 100.

[0052] The working principle of the second driving and clamping assembly 400: First, the second electric slide 430 drives the second driving member 410 to move horizontally close to the other side of the battery shell 200, so that the second clamping part 4210 is directly above the battery shell cover 100; secondly, the second driving member 410 drives the second clamping part 4210 to move downward, and the bottom surface of the second clamping part 4210 abuts against the top surface of the battery shell cover 100; finally, the laser welding machine directly performs full welding operation on the second non-contact surface 102. When the second non-contact surface 102 is laser welded, the second driving member 410 and the second electric slide 430 respectively perform reset actions, and finally the second clamping part 4210 leaves the top of the battery shell cover 100, thereby completing the laser welding of the battery shell cover 100.

[0053] The present application also provides a battery welding device, comprising the battery welding fixture 10 and a laser welding machine described in any of the above embodiments;

[0054] In this embodiment, the battery welding equipment uses the above-mentioned battery welding fixture 10 and laser welding machine, which can better realize the laser welding of the first non-contact surface 101 and the second non-contact surface 102 in sequence, effectively avoiding the problems of warping and thermal deformation of the battery shell cover 100 during the laser welding process, and improving the flatness of the battery shell cover 100 after overall welding and fixation.

[0055] Compared with the prior art, the present invention has at least the following advantages:

[0056] 1. The first pressing part can be driven to move by the first driving member until the first pressing part presses the battery shell cover and the battery shell with at least one end open; similarly, the second pressing part can be driven to move by the second driving member until the second pressing part presses the battery shell cover and the battery shell with at least one end open, so that the first pressing part and the second pressing part can alternately press the battery shell cover in sequence, so that the battery shell cover is laser welded along its circumferential welding path, thereby effectively preventing the battery shell cover from warping during the laser welding process.

[0057] 2. Since the first cooling channel cavity and the second cooling channel cavity are both connected to the cooling water circulation system of the chiller, the chiller can supply circulating cooling water to the first pressing part and the second pressing part, so that the first pressing part and the second pressing part can transfer the excess heat of the battery shell cover along the welding path to the circulating cooling water in the first cooling channel cavity and the second cooling channel cavity respectively through heat transfer, thereby reducing the laser heat on the battery shell cover along its circumferential welding path, avoiding overheating and deformation of the battery shell cover, and effectively improving the flatness of the battery shell cover after overall welding and fixation.

[0058] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A battery welding fixture, characterized in that: include: a first driving and pressing assembly, the first driving and pressing assembly comprising a first driving member and a first pressing assembly movably connected thereto, the first pressing assembly comprising a first pressing portion, and when in a first working state, the first driving member drives the first pressing portion to press the battery shell cover and the battery shell having at least one open end, so that the battery shell cover is fixed to the opening of the battery shell; A second driving and clamping assembly, the second driving and clamping assembly includes a second driving member and a second clamping assembly movably connected thereto, the second clamping assembly includes a second clamping portion, when in the second working state, the second driving member drives the second clamping portion to clamp the battery shell cover and the battery shell with at least one end open, so that the battery shell cover is fixed to the opening of the battery shell; the first clamping portion is provided with a first cooling flow channel cavity, the second clamping portion is provided with a second cooling flow channel cavity, the first cooling flow channel cavity and the second cooling flow channel cavity are both connected to the cooling water circulation system of the chiller.

2. The battery welding fixture according to claim 1, characterized in that: The first driving and pressing assembly further includes a first electric slide rail; the first electric slide rail is provided on one side of the battery housing, the first driving member is fixedly mounted on a sliding end of the first electric slide rail, and the first electric slide rail is used to drive the first driving member to perform horizontal movement; The first clamping assembly also includes a first connecting rod; the outer peripheral wall of the first clamping part is formed with a first air avoidance slope, the first air avoidance slope is used to avoid the laser beam emitted by the laser welding machine, and the first clamping part is located above the battery shell cover; one end of the first connecting rod is connected to the movable telescopic end of the first driving member, and the other end of the first connecting rod is connected to the first clamping part, and the first driving member is used to drive the first clamping part to move vertically.

3. The battery welding fixture according to claim 2, characterized in that: The first driving member is a telescopic air cylinder, a telescopic electric cylinder or a telescopic hydraulic cylinder.

4. The battery welding fixture according to claim 2, characterized in that: The second driving and pressing assembly further includes a second electric slide rail; the second electric slide rail is provided on the other side of the battery housing, the second driving member is fixedly mounted on the sliding end of the second electric slide rail, and the second electric slide rail is used to drive the second driving member to move horizontally; The second clamping assembly also includes a second connecting rod; the outer peripheral wall of the second clamping part is formed with a second air avoidance slope, the second air avoidance slope is used to avoid the laser beam emitted by the laser welding machine, and the second clamping part is located above the battery shell cover; one end of the second connecting rod is connected to the movable telescopic end of the second driving member, and the other end of the second connecting rod is connected to the second clamping part, and the second driving member is used to drive the second clamping part to move vertically.

5. The battery welding fixture according to claim 4, characterized in that: The second driving member is a telescopic air cylinder, a telescopic electric cylinder or a telescopic hydraulic cylinder.

6. The battery welding fixture according to claim 4, characterized in that: The first air avoidance inclined surface and the second air avoidance inclined surface respectively form a preset angle with the horizontal plane, and the angle range of the preset angle is 30 degrees to 60 degrees.

7. The battery welding fixture according to claim 1, characterized in that: The first cooling channel cavity and the second cooling channel cavity are linear cooling channel cavities.

8. The battery welding fixture according to claim 1, characterized in that: The water inlet and the water outlet of the first cooling channel cavity are respectively provided with a first connecting water nozzle, and the first connecting water nozzle is used to be detachably connected to the water inlet or the water outlet of the first cooling channel cavity; The water inlet and water outlet of the second cooling channel cavity are respectively provided with a second connecting water nozzle, and the second connecting water nozzle is used to be detachably connected to the water inlet or the water outlet of the second cooling channel cavity.

9. A battery welding device, characterized in that: The invention comprises the battery welding fixture and laser welding machine according to any one of claims 1 to 8.

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