Battery

Abstract

The utility model provides a battery which comprises a first component and a second component, and the second component and the first component are welded to form a welding track; the welding track comprises a first welding track, a second welding track and a third welding track which are connected in sequence, the extension directions of the first welding track and the third welding track are different, and the second welding track is bent; in the embodiment of the utility model, the first welding track and the third welding track are transited and steered through the second welding track, and the second welding track is bent, so that the transition area between the first welding track and the third welding track is not a sharp corner, and the welding transition area can be prevented from being too sharp, and the welding quality is improved. And therefore, the effect of ensuring the welding reliability is further achieved. In addition, the welding process can be more stable, the welding process is easier to implement, the welding process is facilitated, the welding efficiency is guaranteed, and the welding quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a battery. Background Technology

[0002] In related technologies, welding is one of the most common connection methods between two components in the lithium battery production process. However, due to the small area of ​​the individual components in a lithium battery and inadequate design of the welding trajectory, punctures often occur during welding, prolonging the entire lithium battery production process and wasting materials and manpower. Utility Model Content

[0003] An embodiment of this utility model provides a battery that can improve the technical problem of puncturing components during the welding process.

[0004] An embodiment of this utility model provides a battery, comprising: a first component and a second component;

[0005] The second component is welded to the first component, forming a welding trajectory;

[0006] The welding trajectory includes a first welding trajectory, a second welding trajectory, and a third welding trajectory connected in sequence. The first welding trajectory and the third welding trajectory extend in different directions, and the second welding trajectory is curved.

[0007] In one embodiment, both the first welding trajectory and the third welding trajectory are set to be linear.

[0008] In one embodiment, the included angle between the first welding trajectory and the third welding trajectory is A, where 0° < A < 180°.

[0009] In one embodiment, the second welding trajectory is set to be arc-shaped, and the radius of the second welding trajectory is R, where R ≥ 0.2 mm.

[0010] In one embodiment, the total welding area between the first component and the second component is S1, the orthographic projection area between the first component and the second component is S2, and 5% < S1 / S2 ≤ 100%.

[0011] In one embodiment, 5% < S1 / S2 ≤ 30%.

[0012] In one embodiment, the first component includes a disc body for electrical connection with a tab; the second component includes a connector for electrical connection with a housing.

[0013] In one embodiment, the second component is provided in multiple parts, and the multiple connectors are arranged at circumferential intervals and are all welded to the disk body.

[0014] In one embodiment, the first component further includes an additional connecting portion for welding to the connector.

[0015] In one embodiment, the additional connecting portions are provided in multiples and are all connected to the outer periphery of the disk body, and are arranged at intervals around the disk body.

[0016] In one embodiment, the end face of the additional connecting portion smoothly transitions to the outer circumference of the disk body along the circumferential direction.

[0017] In one embodiment, the additional connecting portion includes a first extended end face away from the disk body along the radial direction of the disk body, and a second extended end face connected to the disk body along the circumferential direction of the disk body, wherein the first extended end face and the second extended end face have a smooth transition.

[0018] In one embodiment, the side of the connector away from the disk body protrudes from the end of the additional connector away from the disk body.

[0019] In one embodiment, the side of the connector away from the disc body is flush with the end of the additional connector away from the disc body.

[0020] In one embodiment, the area of ​​the additional connecting portion is S3, the area of ​​the disk body is S4, and 0% < S3 / S4 ≤ 50%.

[0021] In one embodiment, 0% < S3 / S4 ≤ 10%.

[0022] In one embodiment, the first component includes a connector, and the second component includes a housing, wherein the welding track is formed between the sidewall of the connector and the inner sidewall of the housing.

[0023] In one embodiment, the first component includes a tab, and the second component includes a collector plate, wherein the tab is welded to the collector plate to form the welding trajectory.

[0024] In one embodiment, there are multiple first welding tracks, second welding tracks, and third welding tracks. The first welding tracks and third welding tracks are arranged in an alternating manner, and adjacent first welding tracks and third welding tracks are connected by the second welding tracks.

[0025] In one embodiment, the welding trajectory includes at least one of S-shaped, zigzag, spiral, and spiral dot patterns.

[0026] The beneficial effects of the embodiments of this utility model are as follows:

[0027] In embodiments of this invention, the welding trajectory includes a first welding trajectory, a second welding trajectory, and a third welding trajectory connected sequentially. That is, the first and third welding trajectories transition and change direction via the second welding trajectory, which is curved. Specifically, the transition section between the first and third welding trajectories is curved. Therefore, the transition area between the first and third welding trajectories is not a sharp angle, thus avoiding the phenomenon of piercing the welded object due to an overly sharp welding transition area, further ensuring welding reliability. Furthermore, the above-mentioned welding trajectory configuration also makes the welding process more stable, easier to implement, more convenient, ensures welding efficiency, and improves welding quality.

[0028] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0030] Figure 1 This is a three-dimensional schematic diagram of the welding trajectory provided in an embodiment of this utility model;

[0031] Figure 2 It is at Figure 1 A magnified view of a section at point A;

[0032] Figure 3 This is a three-dimensional schematic diagram of the connection between the disc body and the connector provided in an embodiment of this utility model;

[0033] Figure 4 This is a schematic diagram of the welding trajectory on the disc body of this utility model;

[0034] Figure 5 It is at Figure 4 A magnified view of section B;

[0035] Figure 6 This is a structural schematic diagram of the additional connecting part;

[0036] Figure 7 This is a three-dimensional schematic diagram of the additional connecting parts;

[0037] Figure 8 This is a schematic diagram of the welding trajectory between the manifold and the outer casing.

[0038] Figure Labels

[0039] 1. Collector plate; 11. Plate body; 12. Connector; 13. Additional connecting part; 131. First extended end face; 132. Second extended end face;

[0040] 2. Welding trajectory; 21. First welding trajectory; 22. Second welding trajectory; 23. Third welding trajectory;

[0041] 3. Outer shell. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0043] Reference Figure 1 and Figure 2 As shown, this application provides a battery, including a first component and a second component;

[0044] The second component is welded to the first component to form a welding trajectory 2;

[0045] The welding trajectory 2 includes a first welding trajectory 21, a second welding trajectory 22 and a third welding trajectory 23 connected in sequence. The first welding trajectory 21 and the third welding trajectory 23 have different extension directions, and the second welding trajectory 22 is curved.

[0046] In an embodiment of this invention, the welding trajectory includes a first welding trajectory 21, a second welding trajectory 22, and a third welding trajectory 23 connected sequentially. That is, the first welding trajectory 21 and the third welding trajectory 23 transition and change direction through the second welding trajectory 22, and the second welding trajectory 22 is configured to be curved, meaning the transition section between the first welding trajectory 21 and the third welding trajectory 23 is curved. Therefore, the transition area between the first welding trajectory 21 and the third welding trajectory 23 is not a sharp angle, thus avoiding the phenomenon of piercing the welded object due to an overly sharp welding transition area, further ensuring welding reliability. Furthermore, the above-mentioned welding trajectory 2 configuration also makes the welding process more stable, easier to implement, more convenient, ensures welding efficiency, and improves welding quality.

[0047] In some embodiments, both the first welding trajectory 21 and the third welding trajectory 23 are set to be linear.

[0048] In some embodiments, the included angle between the first welding trajectory 21 and the third welding trajectory 23 is A, where 0° < A < 180°.

[0049] During the welding process, the angle between the straight lines containing the first welding trajectory 21 and the second welding trajectory 22 can be adjusted according to the actual welding length of the first component and the second component, thereby adjusting the overall length of the welding trajectory to ensure a stable connection between the first component and the second component; or, the number of the first welding trajectory 21 and the second welding trajectory 22 can be adjusted according to the actual welding length of the first component and the second component, thereby adjusting the overall length of the welding trajectory to ensure a stable connection between the first component and the second component.

[0050] In some embodiments, the second welding trajectory 22 is configured as an arc shape, and the radius of the second welding trajectory 22 is R, where R ≥ 0.2 mm. This avoids the phenomenon of large "weld points" appearing in the transition area between the first welding trajectory 21 and the third welding trajectory 23 due to the radius of the second welding trajectory 22 being too small, thus ensuring the quality of the weld between the first component and the second component and guaranteeing the welding reliability between the first component and the second component.

[0051] Understandably, referring to Figure 2 As shown, in the specific welding process, the radius R of the second welding trajectory 22 can also be set to be greater than or equal to 0.5mm, which facilitates the entire welding process and ensures welding quality.

[0052] In some embodiments, the total welding area between the first component and the second component is S1, and the orthographic projection area between the first component and the second component is S2, where 5% < S1 / S2 ≤ 100%. During actual welding, by limiting the ratio of the total welding area between the first component and the second component to the orthographic projection area between the first component and the second component within a certain range, the welding reliability between the first component and the second component can be guaranteed, ensuring a stable connection between them. This also avoids increasing welding time due to excessive and unnecessary welding processes, ensuring welding efficiency while preventing waste of manpower and welding materials.

[0053] It should also be further explained that the projected area between the first component and the second component can be the overlapping area after the first component and the second component come into direct contact.

[0054] In some embodiments, 5% < S1 / S2 ≤ 30%. Therefore, by setting the ratio of the total welding area between the first component and the second component to the projected area between the first component and the second component to be between 5% and 30%, a solid weld between the disc body 11 and the connector 12 is further ensured, and the phenomenon of increased welding time due to excessive and unnecessary welding processes is avoided. This ensures welding efficiency while also preventing waste of manpower and welding materials.

[0055] In some embodiments, refer to Figures 3 to 5 As shown, the first component includes a disc body 11, which is used for electrical connection with the electrode tab; the second component includes a connector 12, which is used for electrical connection with the outer casing 3. In this embodiment, the disc body 11 is circular to be used for connection with a circular battery cell, and the disc body 11 is welded to the connector 12 to form a current collector 1.

[0056] To ensure the welding quality between the connector 12 and the battery casing 3, the arc angle of the inner welding surfaces of the connector 12 and the battery casing 3 must always be consistent during the assembly process. Therefore, in this embodiment, the side of the connector 12 closest to the battery cell is set to an arc shape, and its arc is consistent with the arc of the disk body 11. The arc of the connector 12 is A, where 5°≤A≤360°.

[0057] In some embodiments, the second component is provided in multiple forms, and the multiple connectors 12 are arranged circumferentially at intervals and all are welded to the disk body 11. It is understood that, referring to... Figure 3 As shown, in this embodiment, there are three connectors 12.

[0058] Of course, the first component is not limited to the disk body 11, and the second component is not limited to the connector 12. In other embodiments, the first component and the second component can be configured as other different elements according to actual production needs, so as to ensure the welding reliability and welding quality between the first component and the second component.

[0059] In some embodiments, refer to Figure 6 and Figure 7 As shown, the first component further includes an additional connecting portion 13, which is used for welding to the connector 12. The additional connecting portion 13 increases the welding area between the first and second components without affecting the upper space of the battery cell, further ensuring the welding reliability and quality between the first and second components.

[0060] In some embodiments, refer to Figure 4 As shown, the additional connecting parts 13 are provided in multiples and are all connected to the outer periphery of the disk body 11, and are arranged at intervals around the disk body 11.

[0061] In some embodiments, refer to Figure 7 As shown, along the circumference of the disc body 11, the end face of the additional connecting part 13 smoothly transitions to the outer circumference of the disc body 11. Therefore, the connection transition area between the disc body 11 and the additional connecting part 13 is arc-shaped, that is, there are no sharp corners, which can avoid the phenomenon of sharp corners piercing other components during assembly and ensure the normal use of each component.

[0062] In some embodiments, refer to Figure 7 As shown, along the radial direction of the disk body 11, the additional connecting portion 13 includes a first extended end face 131 facing away from the disk body 11, and along the circumferential direction of the disk body 11, the additional connecting portion 13 includes a second extended end face 132 connected to the disk body 11, and there is a smooth transition between the first extended end face 131 and the second extended end face 132.

[0063] It is understood that in this embodiment, the additional connecting portion 13 includes two second extended end faces 132, and both second extended end faces 132 and the first extended end face 131 are rounded.

[0064] Specifically, since the disc 11 in this embodiment is also circular, it ensures that the entire outer periphery of the disc 11, the transition area between the outer periphery of the disc 11 and the side of the additional connecting part 13, and the entire outer edge of the additional connecting part 13 are all curved surfaces. In other words, there are no sharp corners on the disc 11. Therefore, it prevents sharp corners from piercing other components during assembly, ensuring the normal use of each component.

[0065] In some embodiments, the side of the connector 12 away from the disk body 11 protrudes from the end of the additional connecting portion 13 away from the disk body 11. In this embodiment, a notch can be formed between the connector 12 and the additional connecting portion 13. During subsequent battery assembly, the battery casing 3 forms a concave structure after being grooved. The notch formed between the connector 12 and the additional connecting portion 13 can provide clearance for the connector 12, preventing the connector 12 from colliding with the battery cell during assembly. In addition, the edge of the additional connecting portion 13 does not protrude from the outer end face of the connector 12, which can also avoid direct contact between the additional connecting portion 13 and the battery casing 3 during battery assembly, ensuring normal use.

[0066] In some embodiments, the side of the connector 12 away from the disk body 11 may also be flush with the end of the additional connector 13 away from the disk body 11.

[0067] In some embodiments, the area of ​​the additional connecting portion 13 is S3, and the area of ​​the disk body 11 is S4, where 0% < S3 / S4 ≤ 50%. By limiting the ratio of the area of ​​the additional connecting portion 13 to the area of ​​the disk body 11 within the above range, it is possible to avoid the additional connecting portion 13 being too large, which would result in the entire disk body 11 being too large, thereby avoiding any impact on the overall volume of the battery and meeting the design requirements for the battery's portability.

[0068] In some embodiments, 0% < S3 / S4 ≤ 10%. By limiting the ratio of the area of ​​the additional connecting part 13 to the area of ​​the disk body 11 within the above range, it is possible to avoid the area of ​​the additional connecting part 13 being too large, which would result in the area of ​​the entire disk body 11 being too large, thereby avoiding any impact on the overall volume of the battery and preventing interference with the internal space of the battery casing 3, thus meeting the design requirements for the portability of the battery.

[0069] In some embodiments, refer to Figure 7 As shown, the first component includes a connector 12, and the second component includes a housing 3. The welding trajectory 2 is formed between the side wall of the connector 12 and the inner side wall of the housing 3.

[0070] In some embodiments, the first component includes a tab, the second component includes a collector plate 1, and the tab is welded to the collector plate 1 to form the welding trajectory 2.

[0071] In some embodiments, there are multiple first welding tracks 21, second welding tracks 22 and third welding tracks 23. The first welding tracks 21 and third welding tracks 23 are arranged in an alternating manner, and adjacent first welding tracks 21 and third welding tracks 23 are connected by the second welding tracks 22.

[0072] In some embodiments, the welding trajectory 2 includes at least one of S-shaped, zigzag, spiral, and spiral point types.

[0073] By setting the welding trajectory 2 as described above, it is possible to ensure that the first component and the second component can be stably connected in all directions, that is, to ensure the reliability of welding in all directions and avoid the phenomenon of incomplete local welding. Moreover, the welding trajectory 2 is stable and easy to implement, thereby ensuring the welding quality between the first component and the second component.

[0074] It is understandable that when the welding trajectory 2 is a spiral point type, it is only necessary to ensure that the turning transition area between the two columns of points with different extension directions is arc-shaped.

[0075] It should also be noted that in other embodiments, the welding trajectory 2 can also be set to other shapes according to actual needs. It is only necessary to ensure that the welding transition areas in two different directions in the welding trajectory 2 are arc-shaped and that there are no sharp corners at any position of the welding trajectory 2, so as to avoid damaging the welded parts during the welding process.

[0076] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery, characterized by, Comprise: A first component; A second component, which is welded with the first component and forms a welding track; Wherein, the welding track comprises a first welding track, a second welding track and a third welding track connected in turn, the extension directions of the first welding track and the third welding track are different, and the second welding track is arranged in a curved manner.

2. The battery of claim 1, wherein, The first welding track and the third welding track are both arranged in a straight line type.

3. The battery of claim 1, wherein, An included angle formed between the first welding track and the third welding track is A, and 0°<A<180°.

4. The battery of claim 1, wherein, The second welding track is arranged in a circular arc shape, and a radius of the second welding track is R, and R≥0.2mm.

5. The battery of claim 1, wherein, A total welding area between the first component and the second component is S1, a normal projection area between the first component and the second component is S2, and 5%<S1 / S2≤100%.

6. The battery of claim 5, wherein, 5%<S1 / S2≤30%.

7. The battery of any one of claims 1-6, wherein, The first component comprises a disc body for electrical connection with a tab, and the second component comprises a connecting piece for electrical connection with a shell.

8. The battery of claim 7, wherein, The second component is provided with a plurality of connecting pieces which are arranged at intervals in a circle and are all welded on the disc body.

9. The battery of claim 8, wherein, The first component further comprises an additional connecting part for welding with the connecting piece.

10. The battery of claim 9, wherein, The additional connecting part is provided with a plurality of parts which are all connected to the outer periphery of the disc body and are arranged at intervals around the disc body.

11. The battery of claim 9, wherein, Along the circumferential direction of the disc body, the end surface of the additional connecting part and the outer periphery of the disc body are smoothly connected in a circle.

12. The battery of any one of claims 9-11, wherein, Along the radial direction of the disc body, the additional connecting part comprises a first extension end surface away from the disc body, along the circumferential direction of the disc body, the additional connecting part comprises a second extension end surface connected with the disc body, and the first extension end surface and the second extension end surface are smoothly connected in a circle.

13. The battery of any one of claims 9-11, wherein, The side of the connecting piece away from the disc body protrudes from the side end of the additional connecting part away from the disc body.

14. The battery of any one of claims 9-11, wherein, The side of the connecting piece away from the disc body is flush with the side end of the additional connecting part away from the disc body.

15. The battery of claim 9, wherein, The area of the additional connecting part is S3, the area of the disc body is S4, and 0%<S3 / S4≤50%.

16. The battery of claim 15, wherein, 0%<S3 / S4≤10%.

17. The battery of claim 1, wherein, The first component comprises a connecting piece, and the second component comprises a shell, and a side wall of the connecting piece and an inner side wall of the shell form the welding track.

18. The battery of claim 1, wherein, The first component comprises a tab, and the second component comprises a current collecting disc, and the tab and the current collecting disc are welded to form the welding track.

19. The battery of claim 1, wherein, The first welding track, the second welding track and the third welding track are all provided with a plurality of parts, the first welding track and the third welding track are arranged in an interlaced manner, and adjacent first welding tracks and third welding tracks are connected through the second welding track.

20. The battery of claim 1, wherein, The welding track comprises at least one of an S type, a back-to-back type, a spiral line type and a spiral point type.

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