High-safety lithium battery cover plate with tabs on two sides

Abstract

The utility model discloses a high-safety lithium battery cover plate with tabs on two sides, which comprises a top cover plate, a positive electrode plate, a negative electrode plate, a positive electrode gasket, a negative electrode gasket, an anti-explosion sheet and an anti-explosion sheet protective film, wherein the positive electrode plate, the negative electrode plate, the positive electrode gasket and the negative electrode gasket are arranged at the upper part of the top cover plate; the sealing ring, the lower plastic, the positive electrode pin, the negative electrode pin, the positive electrode rivet and the negative electrode rivet are arranged on the lower portion of the top cover piece, and the positive electrode pin comprises a FUSE structure, namely a fusing structure and is connected into the cover plate in a riveting mode. The positive electrode pin and the negative electrode pin can be respectively welded with the tabs on the two sides of a single roll core or a plurality of roll cores, and are assembled in a shell after being welded. The cover plate provided by the utility model is simple in structure and convenient to produce and operate, the pins on the two sides enlarge the flow guide area, the internal resistance of the battery is reduced, the rate capability of the battery is improved, meanwhile, the FUSE structure can be quickly fused when the voltage and the current are sharply increased in an abnormal use environment, and the safety performance is good.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion batteries, in particular to a high-safety lithium battery cover with tabs on both sides. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and environmental protection. They are highly favored in the field of new energy vehicles. At the same time, their application in the energy storage field is also developing rapidly.

[0003] However, with the growing demand for fast charging and discharging of lithium-ion batteries, optimization of battery structure is being pursued, generally resulting in the adoption of a full-tab structure. This structure can be assembled into a battery case in either horizontal or vertical configurations. The horizontal configuration places the positive and negative tabs on the same side, requiring only a single cover plate. The vertical configuration places the positive and negative tabs at opposite ends, requiring one or two cover plates. The cost of using two cover plates is high, while a single cover plate design can be unreliable and unsafe in abnormal operating environments.

[0004] In view of this, it is necessary to provide a lithium battery cover structure that can perform high-rate charge and discharge and has good safety performance. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of the existing technology and provide a high-safety lithium battery cover with tabs on both sides, which can achieve high-rate charge and discharge while also having good safety performance. The specific technical solution is as follows:

[0006] A high-safety lithium battery cover with tabs on both sides comprises a cover and a winding core, a positive electrode plate, a negative electrode plate, a positive electrode gasket, a negative electrode gasket, an explosion-proof disk protective film, an explosion-proof disk arranged on the upper part of the top cover, and a sealing ring, a lower plastic, a positive electrode pin, a negative electrode pin, a positive electrode rivet, and a negative electrode rivet arranged on the lower part of the top cover, which are fixedly connected to form the cover by riveting; the positive electrode pin and the negative electrode pin are assembled with the tabs on both sides of the winding core by welding them into the shell.

[0007] Preferably, the number of sealing rings is 4, and the number of winding cores is ≥1.

[0008] Preferably, the pole pin includes a FUSE structure, and the FUSE structure consists of a fuse structure and an insulating fixing structure.

[0009] Preferably, the insulating fixing structure is made of one or more of PPS, PEEK, PI, and PSU.

[0010] Preferably, the fusing condition of the fusing structure is that the fusing time is ≤ 10s when the current exceeds 1000A~1200A.

[0011] Compared with the closest existing technology, the technical solution provided by the utility model has the following beneficial effects:

[0012] The cover plate of the utility model has a simple structure and is easy to produce and operate. The pins on both sides increase the diversion area and reduce the internal resistance of the battery. Compared with the structure of the pole ear cover plate on the same side, the discharge rate can be increased by 5 to 10 times. At the same time, when the voltage and current of the FUSE structure increase sharply under abnormal use environment, the fuse structure can be quickly melted, thereby quickly cutting off the circuit. At the same time, the insulating fixing structure plays a good supporting role when the fuse structure is melted, preventing the fuse structure from sticking after melting, ensuring the safe use of the battery, and having good safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an exploded view of the cover plate of the utility model;

[0014] Figure 2 This is the welding diagram of the coil core and the cover plate of the utility model;

[0015] In the figure: 1. Positive plate, 2. Negative plate, 3. Positive gasket, 4. Negative gasket, 5. Top cover, 6. Explosion-proof disk protective film, 7. Explosion-proof disk, 8. Sealing ring, 9. Lower plastic, 10. Positive pin, 11. Negative pin, 12. Positive rivet, 13. Negative rivet, 101. Fuse structure, 102. Insulation fixing structure, 21. Cover plate, 22. Winding core. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] See also Figure 1-Figure 2 , the utility model provides a technical solution:

[0018] A high-safety lithium battery cover with tabs on both sides includes a cover 21 and a winding core 22. A positive electrode plate 1, a negative electrode plate 2, a positive gasket 3, a negative gasket 4, an explosion-proof plate protective film 6, an explosion-proof plate 7 are arranged on the upper part of the top cover 5. Four sealing rings 8, a lower plastic 9, a positive electrode pin 10, a negative electrode pin 11, a positive electrode rivet 12, and a negative electrode rivet 13 are arranged on the lower part of the top cover 5 and fixedly connected by riveting to form the cover 21. The fuse structure in the positive electrode pin 10 is composed of a fuse structure 101 and an insulating fixing structure 102. The utility model is suitable for high-safety lithium battery cover with tabs on both sides. The positive electrode pin 10 and the negative electrode pin 11 can be welded to the tabs on both sides of a single winding core 22 or multiple winding cores 22, and then assembled into the shell. The production process of this cover is easy to operate. The pins on both sides increase the diversion area, reduce the internal resistance of the battery, and improve the battery rate performance.

[0019] Furthermore, the insulating fixing structure 102 is made of one or more materials selected from the group consisting of PPS, PEEK, PI, and PSU.

[0020] Furthermore, the fusing condition of the fusing structure 101 is that the fusing time is ≤ 10s when the current exceeds 1000A to 1200A. The fusing structure can quickly fusing when the voltage and current increase sharply under abnormal use environment, and has good safety performance.

[0021] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0022] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-safety lithium battery cover with tabs on both sides, comprising a cover (21) and a winding core (22), characterized in that: The positive electrode plate (1), the negative electrode plate (2), the positive gasket (3), the negative gasket (4), the explosion-proof plate protective film (6), the explosion-proof plate (7) arranged on the upper part of the top cover plate (5) and the sealing ring (8), the lower plastic (9), the positive electrode pin (10), the negative electrode pin (11), the positive electrode rivet (12), and the negative electrode rivet (13) arranged on the lower part of the top cover plate (5) are fixedly connected to form a cover plate (21) by riveting; the positive electrode pin (10) and the negative electrode pin (11) are assembled with the pole ears on both sides of the winding core (22) by welding into the shell.

2. The high-safety lithium battery cover with tabs on both sides according to claim 1, characterized in that: The number of the sealing rings (8) is 4, and the number of the winding cores (22) is ≥1.

3. The high-safety lithium battery cover with tabs on both sides according to claim 1, characterized in that: The positive electrode pin (10) comprises a FUSE structure, which is composed of a fuse structure (101) and an insulating fixing structure (102).

4. The high-safety lithium battery cover with tabs on both sides according to claim 3, characterized in that: The fusing condition of the fusing structure (101) is that the fusing time is ≤10s when the current exceeds 1000A-1200A.

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