High-safety butterfly welding structure and battery

Abstract

The utility model relates to a high safety butterfly welding structure and battery, the high safety butterfly welding structure comprises a cover plate, a positive pole connecting piece, a negative pole connecting piece, a positive pole lug and a negative pole lug, the positive pole lug is arranged between the positive pole connecting piece and the cover plate, and the positive pole connecting piece is respectively connected with the positive pole lug and a positive pole column on the cover plate; the negative pole lug is arranged between the negative pole connecting piece and the cover plate; and the negative pole connecting piece is respectively connected with the negative pole lug and the negative pole column on the cover plate. According to the utility model, the positive pole lug is arranged between the positive pole connecting piece and the cover plate, and the negative pole lug is arranged between the negative pole connecting piece and the cover plate, so that the utilization rate of the internal space of the battery can be effectively improved, and the bending space of the positive pole lug and the negative pole lug is increased; the safety risk caused by the poor bending state of the tab in the traditional butterfly welding battery structure is effectively avoided, and the safety performance of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a high-safety butterfly welding structure and a battery. Background Art

[0002] With the advancement of the global electrification revolution, various industries such as mobile electronics, transportation, and energy storage have undergone tremendous changes. Among them, lithium-ion batteries, due to their significant advantages such as high specific energy and long cycle life, are clean and efficient batteries with great development prospects and have become the most widely used electrochemical power source. With the development of lithium battery technology, high-energy-density batteries are released in an endless stream. However, the increase in energy density may be accompanied by a decrease in safety performance. For example, the connection between the core and the cover of square-shell batteries currently mostly uses traditional butterfly welding. In order to pursue high energy density, the internal space of the battery needs to be further compressed, which may lead to insufficient bending space for the tabs, thereby causing safety risks such as thermal runaway. Therefore, for high-energy-density butterfly welding structures, it is necessary to further develop safer battery structures. Utility Model Content

[0003] Based on this, in order to pursue high energy density, the butterfly welding structure of the current square shell battery needs to further compress the internal space of the battery, which may lead to insufficient bending space for the tabs, and thus cause safety risks such as thermal runaway. The utility model proposes a high-safety butterfly welding structure and battery.

[0004] The utility model provides a high-safety butterfly welding structure, which includes a cover plate, a positive electrode connecting piece, a negative electrode connecting piece, a positive electrode ear and a negative electrode ear. The positive electrode ear is arranged between the positive electrode connecting piece and the cover plate, and the positive electrode connecting piece is respectively connected to the positive electrode ear and the positive electrode column on the cover plate. The negative electrode ear is arranged between the negative electrode connecting piece and the cover plate, and the negative electrode connecting piece is respectively connected to the negative electrode ear and the negative electrode column on the cover plate.

[0005] The utility model places the positive electrode tab between the positive electrode connecting piece and the cover plate, and places the negative electrode tab between the negative electrode connecting piece and the cover plate, which can effectively improve the internal space utilization of the battery, and at the same time increase the bending space of the positive electrode tab and the negative electrode tab, effectively avoiding the safety risks caused by the poor bending state of the tabs in the traditional butterfly welding battery structure, and improving the safety performance of the product.

[0006] As a further improvement of the above solution of the present invention, a boss 1 is provided on the side of the positive electrode connecting piece facing the cover plate, and the boss 1 is connected to the positive electrode column.

[0007] As a further improvement of the above solution of the present invention, a side of the positive electrode connecting piece away from the cover plate is recessed at a position corresponding to the boss one to form a groove one.

[0008] As a further improvement of the above solution of the present invention, a second boss is provided on the side of the negative electrode connecting piece facing the cover plate, and the second boss is connected to the negative electrode post.

[0009] As a further improvement of the above solution of the present invention, a side of the negative electrode connecting piece away from the cover plate is recessed at a position corresponding to the second boss to form a second groove.

[0010] The utility model provides a battery, which includes the high-safety butterfly welding structure as mentioned above.

[0011] As a further improvement of the above solution of the present invention, the battery further includes at least two pole cores, the positive pole tabs of at least two pole cores are both located between the positive electrode connecting sheet and the cover plate, and the positive pole tabs of at least two pole cores are both connected to the positive electrode connecting sheet.

[0012] As a further improvement of the above solution of the present invention, the negative electrode tabs of at least two electrode cores are both located between the negative electrode connecting piece and the cover plate, and the negative electrode tabs of at least two electrode cores are both connected to the negative electrode connecting piece.

[0013] As a further improvement of the above solution of the present invention, the battery further comprises an aluminum shell with an open opening on one side, at least two pole cores are disposed in the aluminum shell, and a cover plate is disposed at the open end of the aluminum shell and is sealed and connected to the aluminum shell.

[0014] As a further improvement of the above solution of the present invention, the battery further includes an insulating film wrapped around the outside of at least two pole cores.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model places the positive electrode tab between the positive electrode connecting piece and the cover plate, and places the negative electrode tab between the negative electrode connecting piece and the cover plate, which can effectively improve the internal space utilization of the battery, and at the same time increase the bending space of the positive electrode tab and the negative electrode tab, effectively avoiding the safety risks caused by the poor bending state of the tabs in the traditional butterfly welding battery structure, and improving the safety performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An exploded view of a battery according to an embodiment of the present invention;

[0018] Figure 2 A partial cross-sectional view of a battery according to an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the structure of a battery core according to an embodiment of the present invention;

[0020] Figure 4A schematic diagram of a high-safety butterfly welding structure in a battery proposed in an embodiment of the present utility model;

[0021] Figure 5 for Figure 4 Schematic diagram of part of the structure;

[0022] Figure 6 This is a schematic structural diagram of a positive electrode connecting piece in a battery proposed in an embodiment of the present utility model;

[0023] Figure 7 for Figure 6 Another perspective of the picture;

[0024] Figure 8 This is a schematic structural diagram of a negative electrode connecting piece in a battery proposed in an embodiment of the present utility model;

[0025] Figure 9 for Figure 8 Another perspective of the picture.

[0026] Figure numerals: 1, cover plate; 2, positive electrode connecting piece; 21, boss one; 22, groove one; 3, negative electrode connecting piece; 31, boss two; 32, groove two; 4, positive electrode tab; 5, negative electrode tab; 6, pole core; 7, aluminum shell; 8, insulating film. DETAILED DESCRIPTION

[0027] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to specific embodiments. 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 facilitate a more thorough and comprehensive understanding of the disclosure of the present invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] Reference Figure 1 、 Figure 2 This embodiment provides a battery, in particular a square battery, which includes a pole core 6, a cover plate 1, a positive electrode connecting piece 2, a negative electrode connecting piece 3 and an aluminum shell 7.

[0030] The number of the pole cores 6 is two or more, such as Figure 3 As shown, the pole core 6 is a pole core 6 with pole tabs on the same side. The pole core 6 can be a stacked core or a wound core. In this embodiment, two pole cores 6 are used as an example for the next description.

[0031] The aluminum shell 7 is a square shell with one end open. It is formed using conventional methods and will not be described in detail here. The two pole cores 6 are assembled into the aluminum shell 7 from the open end, with an insulating film 8 interposed between the exterior of the two pole cores 6 and the aluminum shell 7. The positive and negative tabs 4 and 5 of the two pole cores 6 face the open end of the aluminum shell 7. In this embodiment, the positive and negative tabs 4 and 5 of the two pole cores 6 are pre-welded with flat-tooth ultrasonic welding to facilitate the laser welding of the tabs in the next step.

[0032] The cover plate 1 is disposed at the open end of the aluminum shell 7 and is sealed and connected to the aluminum shell 7. The positive and negative electrode posts are disposed on the cover plate 1. In this embodiment, the sealing connection between the cover plate 1 and the aluminum shell 7 is achieved by conventional peripheral welding, which will not be described in detail here.

[0033] Combine Figure 4 、 Figure 5 The positive electrode connecting piece 2 is connected to the positive electrode tabs 4 and the positive electrode column of the two electrode cores 6 respectively by laser welding, and the positive electrode tabs 4 of the two electrode cores 6 are located between the cover plate 1 and the positive electrode connecting piece 2. In this embodiment, combined with Figure 6 、 Figure 7 The positive electrode connecting piece 2 is provided with a boss 21 on the side facing the cover plate 1. The boss 21 is electrically connected to the positive electrode column. The positive electrode connecting piece 2 is recessed at a position corresponding to the boss 21 on the side away from the cover plate 1 to form a groove 22. The negative electrode connecting piece 3 is connected to the negative electrode tabs 5 and the negative electrode column of the two electrode cores 6 respectively by laser welding. The negative electrode tabs 5 of the two electrode cores 6 are located between the cover plate 1 and the negative electrode connecting piece 3. In this embodiment, combined with Figure 8 、 Figure 9 The negative electrode connecting piece 3 is provided with a second boss 31 on the side facing the cover plate 1. Boss 31 is electrically connected to the negative electrode post. The negative electrode connecting piece 3 is recessed on the side facing away from the cover plate 1, corresponding to boss 31, to form a second groove 32. In this embodiment, a high-safety butterfly weld structure is formed between the cover plate 1, the positive electrode connecting piece 2, the negative electrode connecting piece 3, the positive electrode tab 4, and the negative electrode tab 5.

[0034] In this embodiment, the positive electrode tab 4 is placed between the positive electrode connecting piece 2 and the cover plate 1, and the negative electrode tab 5 is placed between the negative electrode connecting piece 3 and the cover plate 1, which can effectively improve the internal space utilization of the battery, and at the same time increase the bending space of the positive electrode tab 4 and the negative electrode tab 5, effectively avoiding the safety risks caused by the poor bending state of the tabs in the traditional butterfly welding battery structure, and improving the safety performance of the product.

[0035] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] 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 high-safety butterfly welding structure, characterized in that: It comprises a cover plate (1), a positive electrode connecting piece (2), a negative electrode connecting piece (3), a positive electrode tab (4) and a negative electrode tab (5); the positive electrode tab (4) is arranged between the positive electrode connecting piece (2) and the cover plate (1), and the positive electrode connecting piece (2) is respectively connected to the positive electrode tab (4) and the positive electrode column on the cover plate (1); the negative electrode tab (5) is arranged between the negative electrode connecting piece (3) and the cover plate (1), and the negative electrode connecting piece (3) is respectively connected to the negative electrode tab (5) and the negative electrode column on the cover plate (1).

2. The high-safety butterfly welding structure according to claim 1 is characterized in that: A boss 1 (21) is provided on the side of the positive electrode connecting piece (2) facing the cover plate (1), and the boss 1 (21) is connected to the positive electrode column.

3. The high-safety butterfly welding structure according to claim 2 is characterized in that: A side of the positive electrode connecting piece (2) away from the cover plate (1) is recessed at a position corresponding to the boss one (21) to form a groove one (22).

4. The high-safety butterfly welding structure according to claim 1, characterized in that: A second boss (31) is provided on the side of the negative electrode connecting piece (3) facing the cover plate (1), and the second boss (31) is connected to the negative electrode column.

5. The high-safety butterfly welding structure according to claim 4, characterized in that: The side of the negative electrode connecting piece (3) away from the cover plate (1) is recessed at a position corresponding to the second boss (31) to form a second groove (32).

6. A battery, characterized in that: The invention comprises the high-safety butterfly welding structure according to any one of claims 1 to 5.

7. The battery according to claim 6, characterized in that The battery further comprises at least two pole cores (6), the positive pole tabs (4) of the at least two pole cores (6) are both located between the positive electrode connecting piece (2) and the cover plate (1), and the positive pole tabs (4) of the at least two pole cores (6) are both connected to the positive electrode connecting piece (2).

8. The battery according to claim 7, characterized in that The negative electrode tabs (5) of at least two pole cores (6) are both located between the negative electrode connecting piece (3) and the cover plate (1), and the negative electrode tabs (5) of at least two pole cores (6) are both connected to the negative electrode connecting piece (3).

9. The battery according to claim 7, characterized in that The battery further comprises an aluminum shell (7) with an open opening on one side, at least two pole cores (6) are arranged in the aluminum shell (7), and the cover plate (1) is arranged at the open end of the aluminum shell (7) and is sealed and connected to the aluminum shell (7).

10. The battery according to claim 9, characterized in that The battery further comprises an insulating film (8) wrapped around the outside of at least two pole cores (6).

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