Battery cell with buffer tabs and battery

Abstract

The utility model belongs to the technical field of polymer lithium ion batteries, and mainly relates to a battery cell with a buffer tab, which comprises a body and a tab for connecting the body and a protective plate, and the tab in the battery cell comprises a first connecting part fixedly connected with the body and a second connecting part fixedly connected with the protective plate; a buffer part is arranged between the first connecting part and the second connecting part, the buffer part is of a bent structure, and the first connecting part and the second connecting part are of straight structures; the shaking space of the battery cell tab is increased through the design of the buffer part, and the deformation performance of the battery cell tab is improved, so that the overall falling performance of the battery is improved; in addition, the utility model further designs a battery comprising the battery cell structure, and the battery also has excellent anti-falling performance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of polymer lithium ion battery, specifically relates to a battery cell with buffer tab and battery. BACKGROUND

[0002] With the mature development of 3C class consumer electronic products, the types of mobile phones, tablet computers and various digital products are increasingly diversified, and the demand for battery performance is also continuously increasing. Consumers have higher requirements for the drop resistance of portable batteries, which requires battery designers to further optimize the battery structure to enhance its performance in the case of drop.

[0003] At present, the drop failure is mostly the tearing and breaking of the tab, and the existing technology often focuses on improving the material of the tab, such as using high-strength materials to increase the tensile strength of the tab, or dispersing stress by changing the planar shape of the tab (such as changing the planar structure of the tab to a special shape). However, these methods often increase the manufacturing cost of the battery, and the effect is not always satisfactory.

[0004] Therefore, it is urgent to improve the existing battery cell with buffer tab to solve the defects of the prior art. SUMMARY

[0005] One of the purposes of the utility model is to provide a battery cell with buffer tab that can alleviate damage when the battery cell drops.

[0006] In order to achieve the above technical purpose, the present application implements the following technical scheme:

[0007] A battery cell with buffer tab, comprising a body and a tab for connecting the body and a protective plate, wherein the tab in the battery cell comprises a first connecting part fixedly connected with the body and a second connecting part fixedly connected with the protective plate; a buffer part is provided between the first connecting part and the second connecting part, the buffer part is a bending structure, and the first connecting part and the second connecting part are both flat structures.

[0008] The above technical scheme produces the following technical effects:

[0009] The present application increases the shaking space of the tab of the battery cell by the design of the tab buffer part, improves the deformation performance of the tab of the battery cell, and thus improves the drop performance of the battery as a whole. During the drop of the battery, the pulling force on the tab can be effectively dispersed and absorbed due to the existence of the buffer part, thereby avoiding the risk of tab breakage and improving the safety and reliability of the battery. At the same time, the design does not significantly increase the manufacturing cost of the battery, and is easy to implement.

[0010] As a further improvement of the battery cell with buffer tab, the cross section of the buffer part is semicircular.

[0011] As a further improvement of the utility model, the length of the first connecting part is less than the diameter of the cross-sectional circle of the buffer part or the length of the first connecting part is greater than or equal to the diameter of the cross-sectional circle of the buffer part along the length direction of the body.

[0012] As a further improvement of the utility model, the length of the second connecting part is greater than the length of the protection plate connecting piece welding part along the length direction of the body.

[0013] As a further improvement of the utility model, the tab further comprises a welding part, the welding part is welded on the surface of the protection plate by laser, and the welding part is fixedly connected with the second connecting part.

[0014] As a further improvement of the utility model, the body has a connecting piece at one end along the length direction of the body, and the connecting piece is used for fixedly connecting with the first connecting part.

[0015] As a further improvement of the utility model, the length of the connecting piece is the same as the width of the body along the width direction of the body.

[0016] As a further improvement of the utility model, the protection plate is a PCM protection plate.

[0017] As a further improvement of the utility model, the surface of the protection plate away from the tab is coated with double-sided adhesive tape.

[0018] The second purpose of the utility model is to provide a battery with a buffer tab to overcome the shortcomings of the prior art.

[0019] In order to achieve the above technical purpose, the following technical scheme is implemented:

[0020] The battery comprises the above-mentioned battery cell, and an upper cover plate and a lower cover plate for assembling the battery cell, and the surface of the upper cover plate is provided with a protection piece.

[0021] The above technical scheme has the following technical effects:

[0022] The protective sheet can further protect the battery from direct impact on the tab of the battery cell when falling, thereby reducing the possibility of battery damage. The material selection and design of the upper cover plate and the lower cover plate ensure the stability and strength of the overall structure of the battery, so that the battery can effectively disperse and absorb impact energy when subjected to external force impact, thereby protecting the battery cell from damage. In addition, the assembly method and structural design of the battery have good heat dissipation performance in daily use, ensuring the stability and safety of the battery in long-term working state. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application. In the drawings:

[0024] Figure 1 is a structural schematic diagram of embodiment 1 of the present application;

[0025] Figure 2 is a structural schematic diagram of embodiment 2 of the present application;

[0026] Figure 3 is a structural schematic diagram of the present application Figure 2 is a local enlarged view at A;

[0027] Among them:

[0028] 1 - body;

[0029] 11 - connecting sheet;

[0030] 2 - protective plate;

[0031] 21 - welding part;

[0032] 22 - double-sided adhesive;

[0033] 3 - tab;

[0034] 31 - first connecting part;

[0035] 32 - second connecting part;

[0036] 33 - buffer part;

[0037] 4 - upper cover plate;

[0038] 5 - lower cover plate;

[0039] 6 - protective sheet. DETAILED DESCRIPTION

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. 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 application pertains. The terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0042] Although this application discloses preferred embodiments as described above, it is not intended to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

[0043] The present invention will be further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0044] Implementation Method 1

[0045] like Figure 1 As shown, in order to solve the technical defect that the battery cell in the prior art often fails due to the breakage of the tab 3 during a drop, this application provides a battery cell with a buffer tab 3, including a body 1 and a tab 3 for connecting the body 1 and the protection plate 2. The tab 3 in the battery cell includes a first connecting part 31 fixedly connected to the body 1 and a second connecting part 32 fixedly connected to the protection plate 2. A buffer part 33 is provided between the first connecting part 31 and the second connecting part 32. The buffer part 33 has a bent structure, and both the first connecting part 31 and the second connecting part 32 have a straight structure.

[0046] The bending structure of the buffer portion 33 allows the tab 3 to have a certain deformation space when subjected to external force, thereby effectively absorbing and dispersing the impact force and reducing the risk of tab 3 breakage caused by direct impact. This design not only improves the drop performance of the battery, but also reduces stress concentration when the tab 3 is connected with the protection plate 2 due to the presence of the buffer portion 33 during the battery assembly process. Thus, the reliability and service life of the battery are further improved. In addition, since the bending structure of the buffer portion 33 can be made of the same material as the battery body 1, it can be machined synchronously with the battery body 1 during the manufacturing process, without significantly increasing the production cost, while maintaining the overall compactness of the battery.

[0047] Further, the cross section of the buffer portion 33 is semicircular. The semicircular design is mainly considered to uniformly disperse the stress when subjected to force, and at the same time, the semicircular cross section can provide sufficient bending space to adapt to external forces in different directions. This design enables the buffer portion 33 to effectively protect the tab 3 from damage when the battery is impacted, thereby prolonging the service life of the battery.

[0048] In the specific embodiment, the present application finds through experiments that the length design of the first connecting portion 31 and the second connecting portion 32 is also crucial. If the length of the first connecting portion 31 is less than or equal to the diameter of the cross-sectional circle of the buffer portion 33, then during the assembly of the battery, the buffer portion 33 can be provided with more bending space, so that when the battery is impacted, the buffer portion 33 can better play its buffering role. Similarly, the length design of the second connecting portion 32 also follows the same principle to ensure that the connection between the tab 3 and the protection plate 2 will not be broken due to stress concentration when the battery is subjected to external force.

[0049] Preferably, in the battery cell of the present application, the length of the first connecting portion 31 along the length direction of the body 1 (Y-axis direction) is equal to the diameter of the cross-sectional circle of the buffer portion 33; the length of the second connecting portion 32 along the length direction of the body 1 (Y-axis direction) is equal to the diameter of the cross-sectional circle of the buffer portion 33. Thus, when the length of the first connecting portion 31 and the length of the second connecting portion 32 are equal to the length of the buffer portion 33, the stress is concentrated at the center of the buffer portion 33 when the tab 3 is bent under force, further improving the impact resistance of the tab 3. The force received by the first connecting portion 31 and the second connecting portion 32 is dispersed to the buffer portion 33, thereby reducing the risk of breakage caused by stress concentration. In addition, by optimizing the length of the first connecting portion 31 and the second connecting portion 32, the stability of the tab 3 during the battery assembly process can be ensured, avoiding damage to the battery cell due to improper assembly.

[0050] Embodiment 2

[0051] As Figures 2-3As shown, unlike embodiment 1, in order to further improve the anti-falling performance of the battery cell of the present application, the tab 3 further comprises a welding portion 21, which is welded to the surface of the protection plate 2 by laser welding, and the welding portion 21 is fixedly connected with the second connecting portion 32. Laser welding can achieve extremely small welding points and extremely high welding strength, which not only reduces the influence of heat generated during welding on the internal structure of the battery, but also improves the overall impact resistance of the battery. In addition, the welding portion 21 of the protection plate 2 and the second connecting portion 32 are fixedly connected (integrally designed in the specific implementation process), which not only provides higher connection strength, but also reduces the influence of heat transfer during the welding process on the performance of the internal materials of the battery. It is worth noting that the precise control of laser welding makes the welding area very small, thereby minimizing the potential damage of heat to sensitive materials inside the battery.

[0052] Further, along the length direction of the body 1 (Y-axis direction), one end of the body 1 extends a connecting piece 11, which is used for fixedly connecting with the first connecting portion 31. The introduction of the connecting piece 11 makes the connection between the first connecting portion 31 and the body 1 of the battery cell more stable. The connecting piece 11 can be designed to match the shape of the first connecting portion 31 (length value and width value) to ensure that there is no unnecessary displacement or looseness between the tab 3 and the body 1 of the battery cell during the assembly and use of the battery. In addition, the material selection and thickness design of the connecting piece 11 are also crucial, which need to ensure that it will not deform or break when bearing the gas pressure generated by the internal chemical reaction of the battery, thereby ensuring the safety and reliability of the battery.

[0053] Further, along the width direction of the body 1 (X-axis direction), the length of the connecting piece 11 is the same as the width of the body 1. This design ensures that the connecting piece 11 and the body 1 of the battery cell have sufficient contact area, so that stress can be evenly dispersed during the assembly and use of the battery, preventing fatigue damage at the connection due to stress concentration. In addition, the design that the length of the connecting piece 11 is the same as the width of the body 1 of the battery cell also enables the connecting piece 11 to provide additional support when the battery is subjected to lateral impact, further enhancing the structural stability of the battery.

[0054] In addition, in embodiment 2, the material selection of the protection plate 2 is also considered. Specifically, the protection plate 2 is a PCM protection plate 2. At the same time, the surface of the protection plate 2 away from the tab 3 is coated with double-sided tape 22. With this design, damage caused by the relative movement between the protection plate 2 and the body 1 of the battery cell during the falling of the battery can be effectively prevented. The use of double-sided tape 22 not only increases the adhesion strength between the protection plate 2 and the body 1 of the battery cell, but also simplifies the assembly steps during the assembly of the battery, improving the production efficiency.

[0055] Other than the same as embodiment 1, this embodiment will not be repeated.

[0056] Embodiment 3

[0057] As Figures 2-3 shown, different from embodiment 1, in order to solve the technical defects that the existing battery lacks external protection in the process of falling and the tab 3 is easy to be pulled and broken, specifically, a battery, comprising the battery cell of any one of embodiments 1-2, and the upper cover plate 4 and the lower cover plate 5 used for assembling the battery cell, the surface of the upper cover plate 4 is provided with a protective sheet 6.

[0058] Specifically, the protective sheet 6 is provided to provide an additional protective layer when the battery is subjected to falling or external force impact. The protective sheet 6 is usually made of high-strength material such as metal or hard plastic, and its shape and size are designed to cover most of the surface of the battery cell, especially the tab 3 area which is easy to be damaged. During the assembly of the battery, the protective sheet 6 is combined with the upper cover plate 4 by mechanical fixation or adhesion, so as to ensure that even if the battery is accidentally dropped during use, the protective sheet 6 can effectively absorb the impact force and avoid direct action on the battery cell, thereby protecting the tab 3 from damage. In addition, the presence of the protective sheet 6 can also prevent the battery from being scratched or squeezed during transportation or use. The improvement of the battery tab 3 further enhances the impact resistance of the battery.

[0059] Further, the surface of the protective sheet 6 away from the battery cell body 1 can also be pasted with the trademark of the battery of the present application, further improving the integrity of the structure of the battery of the present application.

[0060] Other than the same as embodiment 1, this embodiment will not be repeated.

[0061] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An electric cell with a buffer tab, comprising a body (1) and a tab (3) for connecting the body (1) and a protection plate (2), characterized in that: the tab (3) comprises a first connecting part (31) fixedly connected with the body (1) and a second connecting part (32) fixedly connected with the protection plate (2); a buffer part (33) is arranged between the first connecting part (31) and the second connecting part (32), the buffer part (33) is a bending structure, and the first connecting part (31) and the second connecting part (32) are both flat structures.

2. The battery cell with buffer tabs according to claim 1, wherein, The cross section of the buffer part (33) is semicircular.

3. The battery cell with buffer tabs of claim 2, wherein, In the length direction of the body (1), the length of the first connecting part (31) is less than the diameter of the cross section circle of the buffer part (33) or the length of the first connecting part (31) is greater than or equal to the diameter of the cross section circle of the buffer part (33).

4. The battery cell with buffer tabs of claim 2, wherein, In the length direction of the body (1), the length of the second connecting part (32) is greater than the length of the welding part of the protection plate connecting sheet 21.

5. The battery cell with buffer tabs of claim 1, wherein, The tab further comprises a welding part (21) which is laser welded to the surface of the protection plate (2), and the welding part (21) is fixedly connected with the second connecting part (32).

6. The battery cell with buffer tabs of claim 1, wherein, In the length direction of the body (1), one end of the body (1) extends a connecting sheet (11) which is used for fixedly connecting with the first connecting part (31).

7. The battery cell with buffer tabs of claim 6, wherein, In the width direction of the body (1), the length of the connecting sheet (11) is the same as the width of the body (1).

8. The battery cell with buffer tabs of claim 1, wherein, The protection plate (2) is a PCM protection plate.

9. The battery cell with buffer tabs of claim 1, wherein, The surface of the protection plate (2) away from the tab (3) is coated with double-sided tape (22).

10. A battery, characterized by The electric cell as claimed in any one of claims 1-9, and an upper cover plate (4) and a lower cover plate (5) used for assembling the electric cell, the surface of the upper cover plate is provided with a protection sheet (6).

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