Welding fixture and welding device

Abstract

The utility model provides a kind of welding fixture and welding device, wherein welding fixture includes base and pressure block. Base is used to place battery shell, and battery shell includes upper cover and lower shell;Pressure block is located at the side of battery shell away from base, and pressure block can be moved in first position and second position, in first position, pressure block is abutted with upper cover to press the upper cover on lower shell;In second position, pressure block is separated from upper cover. The side edge of pressure block is flush with the side edge of battery shell, or the side edge of pressure block is located outside the side edge of battery shell. The side edge of pressure block is concave inwardly with welding groove, and the welding groove penetrates through pressure block in the thickness direction of pressure block, and part of the inner wall of welding groove is located inside the side edge of battery shell. The pressure block of the welding fixture of the utility model embodiment can avoid the problems of misplacement between upper cover and lower shell and deformation of upper cover.

Description

Technical Field

[0001] This utility model relates to the field of battery casing welding technology, and in particular to a welding fixture, a welding casing, and a battery casing. Background Technology

[0002] The battery casing of a prismatic lithium-ion battery typically consists of an upper cover and a lower cover. After the battery cell assembly is installed into the casing, the upper cover and lower cover need to be assembled and welded together. During the welding process, a clamping block is usually used to press the upper cover onto the lower cover to facilitate welding the upper cover and lower cover using a laser.

[0003] In related technologies, the edge of the pressure block is usually located inside the edges of the upper cover and the lower shell to avoid affecting the laser welding of the joint between the upper cover and the lower shell. However, this arrangement can easily cause misalignment between the upper cover and the lower shell and can also cause deformation of the upper cover.

[0004] Therefore, the pressing block in the relevant technology has the problem that it can easily cause misalignment between the upper cover and the lower shell and can easily cause deformation of the upper cover. Utility Model Content

[0005] This utility model provides a welding fixture to solve the problems in related technologies where the pressure block can easily cause misalignment between the upper cover and the lower shell and can easily cause deformation of the upper cover.

[0006] The welding fixture of this utility model embodiment includes a base and a pressure block.

[0007] The base is used to place the battery housing, which includes an upper cover and a lower shell;

[0008] The pressure block is located on the side of the battery casing away from the base. For example, if the battery casing is located on the upper surface of the base, then the pressure block is located above the base and above the battery casing. The pressure block can move in a first position and a second position. In the first position, the pressure block abuts against the upper cover to press the upper cover onto the lower casing. In the second position, the pressure block disengages from the upper cover.

[0009] The side edge of the pressure block is flush with the side edge of the battery casing, or the side edge of the pressure block is located outside the side edge of the battery casing.

[0010] It is understandable that by aligning the side edge of the pressure block with the side edge of the battery casing, or by placing the side edge of the pressure block outside the side edge of the battery casing, the pressure block can be completely pressed onto the top cover of the battery casing. At the same time, the force exerted by the pressure block on the top cover can be almost completely transmitted to the bottom cover. That is, the stress point of the battery casing is at the connection between the top cover and the bottom cover. This can prevent the top cover from deforming and the top cover from misaligning with the bottom cover.

[0011] The side edge of the pressure block has an inwardly recessed welding groove that penetrates the pressure block in the thickness direction. Part of the inner wall of the welding groove is located inside the side edge of the battery casing.

[0012] There are multiple welding grooves, which are spaced apart circumferentially on the pressure block.

[0013] By setting multiple inwardly recessed welding grooves on the side edge of the pressure block, it is convenient to weld the part of the battery casing that corresponds to the welding groove. For example, pre-welding the part of the battery casing that corresponds to the welding groove can be used to initially fix the upper cover and lower shell of the battery casing, which can facilitate full welding of the battery casing after the pressure block is removed.

[0014] In other words, when the pressure block is in the first position, the battery casing can be pre-fixed by spot welding. At the same time, when the pressure block is in the second position, the battery casing can be fully welded to achieve the effect of connecting and sealing the upper and lower covers of the battery casing.

[0015] Therefore, the pressure block of the welding fixture in this embodiment of the present invention can avoid the problems of misalignment between the upper cover and the lower shell and deformation of the upper cover.

[0016] In some embodiments, the welding groove is a square welding groove, and the cross-section of the square welding groove is square; or

[0017] The welding groove is an arc-shaped welding groove, and the cross-section of the arc-shaped welding groove is arc-shaped.

[0018] This utility model also provides a welding device.

[0019] The welding apparatus of this utility model embodiment includes:

[0020] The welding fixture, the first adjustment assembly, and the welding assembly as described in the above embodiments.

[0021] The first adjustment component is connected to the base to drive the base to move;

[0022] The welding assembly is used to emit a laser to form a weld on the battery casing to connect the upper cover and the lower shell.

[0023] In some embodiments, the welding assembly includes a laser that emits a laser beam perpendicular to the sidewall of the lower housing.

[0024] In some embodiments, there is an assembly gap between the upper cover and the lower shell, wherein the size L1 of the assembly gap is ≤50μm in the thickness direction of the upper cover.

[0025] In some embodiments, the welded portion has a first edge located on the upper cover and a second edge located on the lower shell, the distance W2 between the first edge and the second edge being 200~300μm.

[0026] In some embodiments, the maximum dimension W1 of the welded portion in the wall thickness direction of the lower shell is 50~100μm.

[0027] In some embodiments of the present invention, the welding apparatus further includes a detection component for detecting the actual position of the battery casing on the base.

[0028] The first adjustment component includes a first lateral adjustment component. The adjustment end of the first lateral adjustment component is connected to the base. The first lateral adjustment component drives the base to move according to the actual position of the battery housing, so as to move the battery housing to a preset position.

[0029] In some embodiments, the first adjustment component further includes a first rotation adjustment component, the adjustment end of the first rotation adjustment component being connected to the base, and the fixed end of the rotation adjustment component being connected to the adjustment end of the first lateral adjustment component. The first rotation adjustment component drives the base to rotate, and the first lateral adjustment component drives the first rotation adjustment component to move laterally, thereby driving the base to move laterally; or the adjustment end of the first rotation adjustment component is connected to the fixed end of the first lateral adjustment component, and the first rotation adjustment component drives the first lateral adjustment component to rotate, thereby driving the base to rotate.

[0030] In some embodiments, the welding assembly further includes a second adjustment assembly, the second adjustment assembly including a second lateral adjustment assembly, the adjustment end of the second lateral adjustment assembly being connected to the laser. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the battery casing fixed by the welding fixture in an embodiment of this utility model;

[0033] Figure 2 This is a schematic diagram of the welding fixture and welding device according to an embodiment of the present utility model;

[0034] Figure 3 This is a top view of the welding fixture according to an embodiment of the present utility model;

[0035] Figure 4 This is an enlarged view of the seam between the upper cover and the lower shell of the battery casing according to an embodiment of the present utility model;

[0036] Figure 5 This is a flow control diagram of the welding apparatus according to an embodiment of the present invention.

[0037] In the picture:

[0038] 100. Welding fixture; 200. Welding device; 300. Battery casing; 310. Top cover; 320. Bottom casing; 330. Welding part; 331. First edge; 332. Second edge; 340. Assembly gap;

[0039] 1. Abutment;

[0040] 2. Press block; 201. Welding groove;

[0041] 3. First adjustment component; 301. First lateral adjustment component; 302. First rotation adjustment component;

[0042] 4. Welding assembly; 401. Laser; 402. Second lateral adjustment assembly;

[0043] 5. Detection components;

[0044] 6. Control module. Detailed Implementation

[0045] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0046] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal encapsulation of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] In related technologies, the edge of the pressure block 2 is typically located inside the edges of the upper cover 310 and the lower shell 320 to avoid affecting the welding of the joint between the upper cover 310 and the lower shell 320 by the laser 401. It is understood that if the pressure applied by the pressure block 2 to the upper cover 310 is too great, it will deform the upper cover 310, thus affecting the welding between the upper cover 310 and the lower shell 320; if the pressure applied by the pressure block 2 to the upper cover 310 is too small, the connection between the upper cover 310 and the lower shell 320 will be loose, easily leading to misalignment.

[0049] Therefore, this arrangement is prone to misalignment between the upper cover 310 and the lower shell 320, and also prone to deformation of the upper cover 310. In other words, the pressure block 2 in the related technology is prone to misalignment between the upper cover 310 and the lower shell 320 and prone to deformation of the upper cover 310.

[0050] In order to solve the problem that the pressure block 2 in the related technology can easily cause misalignment between the upper cover 310 and the lower shell 320 and can easily cause the upper cover 310 to deform.

[0051] The welding fixture 100 of this utility model embodiment includes a base 1 and a pressure block 2.

[0052] like Figure 1 and 2 As shown, the base 1 is used to place the battery housing 300, which includes an upper cover 310 and a lower cover 320.

[0053] The pressure block 2 is located on the side of the battery housing 300 away from the base 1. For example, if the battery housing 300 is located on the upper surface of the base 1, then the pressure block 2 is located above the base 1 and above the battery housing 300. At the same time, the pressure block 2 can move in a first position and a second position. In the first position, the pressure block 2 abuts against the upper cover 310 to press the upper cover 310 onto the lower housing 320; in the second position, the pressure block 2 is disengaged from the upper cover 310.

[0054] The side edge of the pressure block 2 is flush with the side edge of the battery housing 300, or the side edge of the pressure block 2 is located outside the side edge of the battery housing 300.

[0055] It is understandable that by aligning the side edge of the pressure block 2 with the side edge of the battery housing 300, or by placing the side edge of the pressure block 2 outside the side edge of the battery housing 300, the pressure block 2 can be completely pressed onto the upper cover 310 of the battery housing 300. At the same time, the force applied by the pressure block 2 to the upper cover 310 can be almost completely transmitted to the lower cover 320. That is, the stress point of the battery housing 300 is at the connection between the upper cover 310 and the lower cover 320. On the one hand, this can prevent the upper cover 310 from deforming, and on the other hand, it can prevent misalignment between the upper cover 310 and the lower cover 320.

[0056] The side edge of the pressure block 2 is recessed with a welding groove 201. The welding groove 201 penetrates the pressure block 2 in the thickness direction. Part of the inner wall of the welding groove 201 is located inside the side edge of the battery casing 300.

[0057] like Figure 3 As shown, there are multiple welding grooves 201, which are spaced apart in the circumferential direction of the pressure block 2.

[0058] By providing multiple inwardly recessed welding grooves 201 on the side edge of the pressure block 2, it is convenient to weld the part of the battery housing 300 corresponding to the welding grooves 201. For example, pre-welding the part of the battery housing 300 corresponding to the welding grooves 201 can be performed to initially fix the upper cover 310 and lower shell 320 of the battery housing 300, which can facilitate full welding of the battery housing 300 after the pressure block 2 is removed.

[0059] In other words, when the pressure block 2 is in the first position, it can achieve the effect of pre-fixation by spot welding the battery housing 300. At the same time, when the pressure block 2 is in the second position, it can achieve the effect of connecting and sealing the upper cover 310 and the lower shell 320 of the battery housing 300 by full welding the battery housing 300.

[0060] Therefore, the pressure block 2 of the welding fixture 100 in this embodiment of the present invention can avoid the problems of misalignment between the upper cover 310 and the lower shell 320 and deformation of the upper cover 310.

[0061] In some embodiments, when the pressure block 2 is in the first position, the pressure applied by the pressure block 2 to the upper cover 310 is 5-20N.

[0062] It is understandable that by applying a pressure of 5-20N to the upper cover 310 with the pressure block 2, it is possible to meet the pressure required for the upper cover 310 to press against the lower cover 320, while avoiding excessive pressure that could damage the battery casing 300, and at the same time reducing the operating cost of the pressure equipment that provides pressure to the pressure block 2.

[0063] In some embodiments, the welding groove 201 is a square welding groove 201 with a square cross-section; or the welding groove 201 is an arc-shaped welding groove 201 with an arc-shaped cross-section.

[0064] It is understandable that the cross-section of the square welding groove 201 is the cross-section of the square welding groove 201 perpendicular to the thickness direction of the pressure block 2. Similarly, the cross-section of the arc-shaped welding groove 201 is the cross-section of the arc-shaped welding groove 201 perpendicular to the thickness direction of the pressure block 2.

[0065] By setting the welding groove 201 as a square welding groove 201 or an arc-shaped welding groove 201, it is easier for the subsequent laser assembly to spot weld the battery housing 300 to the position corresponding to the welding groove 201.

[0066] This utility model also provides a welding device 200.

[0067] The welding apparatus 200 of this utility model embodiment includes a welding fixture 100, a first adjustment component 3 and a welding component 4 as described in the above embodiment.

[0068] like Figure 2 As shown, the first adjustment component 3 is connected to the base 1 to move the base 1. For example, as shown in the figure, the first adjustment component 3 is located below the base 1 and is connected to the base 1.

[0069] The welding assembly 4 is used to emit a laser to form a weld 330 on the battery housing 300 to connect the upper cover 310 and the lower housing 320.

[0070] It is understandable that the laser emitted by the welding component 4 can form a welding pool on the battery casing 300, that is, a welding pool is formed at the connection between the upper cover 310 and the lower casing 320. The welding pool includes a portion located on the upper cover 310 and a portion located on the lower cover. After the welding pool solidifies, a weld 330 can be formed at the joint between the upper cover 310 and the lower casing 320 to connect the upper cover 310 and the lower casing 320.

[0071] The welding device 200 of this utility model embodiment can avoid misalignment between the upper cover 310 and the lower shell 320 and deformation of the upper cover 310 during the welding process by setting the welding fixture 100 of the above embodiment, thereby greatly improving the welding quality of the welding device 200 of this utility model embodiment.

[0072] In some embodiments, the welding assembly 4 includes a laser 401. The laser emitted by the laser 401 is perpendicular to the side wall of the lower shell 320. That is, the laser 401 is located on the outside of the side wall of the battery shell 300. The weld pool formed between the upper cover 310 and the lower shell 320 by the laser emitted by the laser 401 is located on the side of the battery shell 300. Compared with the method of forming the weld pool on the top of the battery shell 300, the weld pool formed on the side of the battery shell 300 has lower requirements for the assembly gap 340 between the upper cover 310 and the lower shell 320. For example, the assembly gap 340 of the top weld needs to be less than 20 μm, while the assembly gap 340 of the side weld only needs to be less than 50 μm.

[0073] It can also weld thinner battery casings 300. For example, the top weld requires a wall thickness of more than 0.2 mm for the lower casing 320, while the side weld requires a wall thickness of 0.1-0.2 mm for the lower casing 320. This can improve the energy density of the battery. At the same time, the weld pool can connect multiple surfaces of the upper cover 310 and the lower casing 320, thereby improving the welding strength and reliability between the upper cover 310 and the lower casing 320, and thus improving the safety performance of the battery.

[0074] In some embodiments, an assembly gap 340 exists between the upper cover 310 and the lower shell 320, and the dimension of the assembly gap 340 in the thickness direction of the upper cover 310 is L1≤50μm. This reduces the high requirements for controlling the assembly gap between the cover and the shell during the assembly process and facilitates welding positioning.

[0075] In some embodiments, such as Figure 4 As shown, the welded part 330 has a first edge 331 on the upper cover 310 and a second edge 332 on the lower shell 320, with a distance W2 between the first edge 331 and the second edge 332 of 200~300μm. This is beneficial for improving the reliability of the weld strength.

[0076] In some embodiments, such as Figure 4 As shown, in the wall thickness direction of the lower shell 320, the maximum dimension W1 of the welded part 330 is 50~100μm. This is beneficial for improving the reliability of the weld strength.

[0077] In some embodiments, the welding apparatus 200 of this utility model further includes a detection component 5, which is used to detect the actual position of the battery casing 300 on the base 1.

[0078] Furthermore, the detection component 5 includes a CCD camera.

[0079] The first adjustment component 3 includes a first lateral adjustment component 301. The adjustment end of the first lateral adjustment component 301 is connected to the base 1. The first lateral adjustment component 301 drives the base 1 to move according to the actual position of the battery housing 300, so as to move the battery housing 300 to a preset position of the battery housing 300.

[0080] Furthermore, the first lateral adjustment component 301 includes a UV platform connected to the base 1. The UV platform drives the base 1 to move according to the actual position of the battery housing 300, so as to move the battery housing 300 to a preset position.

[0081] Understandably, the UV platform can move the base 1 on its plane, which can be parallel to the end face of the base 1 used to place the battery housing 300.

[0082] For example, such as Figure 2 As shown, the UV platform is located below and connected to the base 1. The CCD camera captures the actual position of the battery housing 300. Based on the actual position of the battery housing 300 captured by the CCD camera, the UV platform drives the base 1 to move the battery housing 300 to a preset position.

[0083] It is understandable that, in order to facilitate the movement of the UV platform, a control module 6 can be set up. For example, the control module 6 is connected to the CCD camera signal to receive the actual position of the battery housing 300 acquired by the CCD camera. The control module 6 compares the actual position of the battery housing 300 acquired by the CCD camera with the preset position of the battery housing 300, and controls the UV platform to move the base 1 to move the battery housing 300 to the preset position of the battery housing 300 based on the offset between the actual position of the battery housing 300 and the preset position of the battery housing 300.

[0084] Simultaneously, a 3D scanner can be set to capture the outline of the battery casing 300 and transmit the outline data of the battery casing 300 to the control module 6. The control module 6 generates welding holes to guide the welding assembly 4 to weld the battery casing 300.

[0085] The control module 6 can be an electronic device such as a microprocessor, PLC, or CPU that can receive and analyze data and control the actions of corresponding devices based on the analysis results.

[0086] In some embodiments, the first adjustment component 3 further includes a first rotation adjustment component 302, the adjustment end of the first rotation adjustment component 302 being connected to the base 1, and the fixed end of the rotation adjustment component being connected to the adjustment end of the first lateral adjustment component 301. The first rotation adjustment component 302 drives the base 1 to rotate, and the first lateral adjustment component 301 drives the first rotation adjustment component 302 to move laterally, thereby driving the base 1 to move laterally; or the adjustment end of the first rotation adjustment component 302 being connected to the fixed end of the first lateral adjustment component 301, the first rotation adjustment component 302 driving the first lateral adjustment component 301 to rotate, thereby driving the base 1 to rotate.

[0087] In other words, the first lateral adjustment component 301 can drive the base 1 to move only on its own plane, and the first rotation adjustment component 302 can drive the base 1 to rotate about an axis perpendicular to its own plane.

[0088] In some embodiments, the welding apparatus 200 of this utility model further includes a second adjustment component, which includes a second lateral adjustment component 402, and the adjustment end of the second lateral adjustment component 402 is connected to the laser component.

[0089] The second lateral adjustment component 402 can move the laser component on its plane, which can be parallel to the end face of the base 1 used to place the battery housing 300.

[0090] Therefore, during the welding process of the battery casing 300, the second lateral adjustment component 402 can drive the laser 401 of the laser component to connect with the first lateral adjustment component 301 and the first rotation adjustment component 302, so as to better weld the battery casing 300.

[0091] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A welding fixture, characterized by, include: A base (1) is used to place a battery housing (300), the battery housing (300) including an upper cover (310) and a lower cover (320). A pressure block (2) is located on the side of the battery housing (300) away from the base (1). The pressure block (2) can move in a first position and a second position. In the first position, the pressure block (2) abuts against the upper cover (310) to press the upper cover (310) onto the lower housing (320). In the second position, the pressure block (2) is disengaged from the upper cover (310). The side edge of the pressure block (2) is flush with the side edge of the battery housing (300), or the side edge of the pressure block (2) is located outside the side edge of the battery housing (300); The side edge of the pressure block (2) is recessed with a welding groove (201), which penetrates the pressure block (2) in the thickness direction. Part of the inner wall of the welding groove (201) is located inside the side edge of the battery casing (300).

2. The welding fixture of claim 1, wherein, The welding groove (201) is a square welding groove (201), and the cross-section of the square welding groove (201) is square; or The welding groove (201) is an arc-shaped welding groove (201), and the cross-section of the arc-shaped welding groove (201) is arc-shaped.

3. A welding device characterized by, include: The welding fixture as described in any one of claims 1-2, The first adjustment component (3) is connected to the base (1) to drive the base (1) to move; Welding assembly (4) is used to emit a laser to form a weld (330) on the battery housing (300) to connect the upper cover (310) and the lower housing (320).

4. The welding device of claim 3, wherein, The welding assembly (4) includes a laser (401) that emits a laser perpendicular to the sidewall of the lower shell (320).

5. The welding device of claim 4, wherein, There is an assembly gap (340) between the upper cover (310) and the lower shell (320), and the size L1 of the assembly gap (340) is ≤50μm in the thickness direction of the upper cover (310).

6. The welding apparatus according to claim 4, characterized in that, The welded part (330) has a first edge (331) on the upper cover (310) and a second edge (332) on the lower shell (320), the distance W2 between the first edge (331) and the second edge (332) is 200~300μm.

7. The welding apparatus according to claim 4, characterized in that, In the wall thickness direction of the lower shell (320), the maximum dimension W1 of the welded part (330) is 50~100μm.

8. The welding apparatus according to claim 4, characterized in that, It also includes a detection component (5) for detecting the actual position of the battery casing (300) on the base (1). The first adjustment component (3) includes a first lateral adjustment component (301). The adjustment end of the first lateral adjustment component (301) is connected to the base (1). The first lateral adjustment component (301) drives the base (1) to move according to the actual position of the battery housing (300) so as to move the battery housing (300) to a preset position.

9. The welding apparatus according to claim 8, characterized in that, The first adjustment component (3) further includes a first rotation adjustment component (302), the adjustment end of which is connected to the base (1), and the fixed end of which is connected to the adjustment end of the first lateral adjustment component (301). The first rotation adjustment component (302) drives the base (1) to rotate, and the first lateral adjustment component (301) drives the first rotation adjustment component (302) to move laterally, thereby driving the base (1) to move laterally; or The adjustment end of the first rotation adjustment component (302) is connected to the fixed end of the first lateral adjustment component (301). The first rotation adjustment component (302) drives the first lateral adjustment component (301) to rotate, thereby driving the base (1) to rotate.

10. The welding apparatus according to claim 4, characterized in that, The welding assembly (4) further includes a second adjustment assembly, which includes a second lateral adjustment assembly (402), the adjustment end of which is connected to the laser (401).

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