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Battery cell and battery

A battery cell and sealing section technology, applied in the field of electrochemical devices, can solve the problems of inability to meet the requirements of long-term reliability of lithium-ion battery packaging, restricting the application of lithium-ion batteries, low packaging strength, etc., so as to improve packaging reliability and safety. properties, improving structural defects, and improving the effect of encapsulation strength

Active Publication Date: 2020-06-26
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, widely used sealing heads (such as flat sealing heads or oblique sealing heads) and their packaging technologies are used to package lithium-ion batteries. The packaging strength of the packaging part of the obtained lithium-ion batteries is low, and its service life is low (generally less than three Years), unable to meet the long-term reliability requirements of lithium-ion batteries for packaging, which limits the application of lithium-ion batteries in the field of long-term energy storage and fields with high requirements for safety and reliability

Method used

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  • Battery cell and battery
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Examples

Experimental program
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Effect test

Embodiment 1

[0077] In this embodiment, the packaging bag 120 is an aluminum-plastic film, and the packaging bag 120 is used to accommodate the electric core 100, and the side sealing part 121 in the packaging bag 120 is pressed as figure 1 After the section line C-C or C-C shown is cut, it is obtained as Figure 6 The sectional view shown. Wherein, the length L1 of the first sealing section 1212 is 5 mm, the length L2 of the second sealing section 1215 is 3 mm, the maximum length L3 of the cavity 1219 is 0.35 mm, and the length L4 of the third sealing section 1216 is 2 mm. The thickness T1 of the first sealing section 1212 is 0.25 mm, the maximum thickness T2 of the second sealing section 1215 is 0.50 mm, the maximum thickness T3 of the cavity 1219 is 0.25 mm, and the minimum thickness T4 of the third sealing section 1216 is 0.30 mm.

[0078] The longitudinal sectional area M of the cavity 1219 is 0.028mm 2 , the sum N of the longitudinal sectional areas of the second sealing section 12...

Embodiment 2

[0081] The packaging bag 120 is an aluminum-plastic film, and the packaging bag 120 is used to accommodate the electric core 100, and the side packaging part 121 in the packaging bag 120 is pressed as follows figure 1 After the section line C-C or C-C shown is cut, it is obtained as Figure 4 The sectional view shown. In this embodiment, the length L1 of the first sealing section 1212 is 3 mm, the length L2 of the second sealing section 1215 is 1 mm, the maximum length L3 of the cavity 1219 is 0.018 mm, and the length L4 of the third sealing section 1216 is 0.3 mm . The thickness T1 of the first sealing section 1212 is 0.18mm, the maximum thickness T2 of the second sealing section 1215 is 0.33mm, the thickness of the cavity 1219 is very small, and the minimum thickness T4 of the third sealing section 1216 is 0.22mm.

[0082] The longitudinal sectional area M of the cavity 1219 is 0.007mm 2 , the sum N of the longitudinal sectional areas of the second sealing section 1215 an...

Embodiment 3

[0085]Different from Embodiment 2, in this embodiment, the length L1 of the first sealing section 1212 is 4.5mm, the length L2 of the second sealing section 1215 is 3.3mm, and the maximum length L3 of the cavity 1219 is 1.4mm. The length L4 of the triple seal section 1216 is 0.22mm. The thickness T1 of the first sealing section 1212 is 0.15 mm, the maximum thickness T2 of the second sealing section 1215 is 0.39 mm, the maximum thickness T3 of the cavity 1219 is 0.29 mm, and the minimum thickness T4 of the third sealing section 1216 is 0.31 mm.

[0086] The longitudinal sectional area M of the cavity 1219 is 0.119mm 2 , the sum N of the longitudinal sectional areas of the second sealing section 1215 and the third sealing section 1216 is 0.431mm 2 , the longitudinal section area K of the first sealing section 1212 is 0.045mm 2 , M:N=0.28, N:K=9.6.

[0087] One side sealing portion 121 of the packaging bag 120 obtained in embodiment 3 is cut open and cut into a sample strip wi...

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Abstract

The invention discloses a battery cell and a battery. The battery cell comprises a battery cell body and a packaging bag for accommodating the battery cell body; the packaging bag comprises a packaging part, and the packaging part comprises a sealing area; and a cavity is formed in the sealing area. According to the battery cell, the cavity is formed in the sealing area, so thermal stress caused by temperature gradient can be eliminated, the mechanical stress of the right angle of the sealing head on the packaging bag is eliminated, and the mechanical stress of the battery cell body is eliminated. Therefore, the morphology of the glue overflowing area of the packaging part can be improved, the structural defects of the glue overflowing area are overcome, the packaging strength of the packaging part of the battery cell is greatly improved, and the reliability and safety of the battery cell are improved.

Description

technical field [0001] The present application relates to the technical field of electrochemical devices, in particular, to an electric cell and a battery. Background technique [0002] Lithium-ion batteries have been widely used in various digital products, power tools, drones, energy storage systems, and automotive power systems due to their advantages such as high energy density, long cycle life, and high performance-price ratio. [0003] Due to the characteristics of aluminum-plastic composite film as a packaging material, the packaging reliability of soft-pack lithium-ion batteries has always been valued by various researchers. In particular, soft-pack lithium-ion batteries used in energy storage systems have more stringent requirements for the long-term reliability of the package. At present, widely used sealing heads (such as flat sealing heads or oblique sealing heads) and their packaging technologies are used to package lithium-ion batteries. The packaging strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M2/08H01M10/0525H01M10/058H01M50/105H01M50/119H01M50/121H01M50/124H01M50/183H01M50/557
CPCH01M10/0525H01M10/058H01M50/183H01M50/119H01M50/105H01M50/121H01M50/557H01M50/124H01M10/0436H01M10/045H01M2220/30H01M10/0583H01M10/0459H01M2220/20H01M10/0431
Inventor 王烽陈宇
Owner NINGDE AMPEREX TECH
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