Cells and Batteries

A battery cell and sealing section technology, applied in the field of electrochemical devices, can solve the problems of low packaging strength, limited application of lithium-ion batteries, and low lifespan

Active Publication Date: 2022-01-25
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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Experimental program
Comparison scheme
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 application discloses a battery cell and a battery. The battery cell includes a battery cell body and a packaging bag for containing the battery cell body. The packaging bag includes a packaging part, and the packaging part includes a sealing area, and a cavity is provided in the sealing area. According to the electric core of the present application, by providing a cavity inside the sealing area, the thermal stress caused by the temperature gradient can be eliminated, the mechanical stress caused by the right angle of the head to the packaging bag can be eliminated, and the mechanical stress caused by the main body of the electric core can be eliminated, thereby It can improve the morphology of the overflowing glue area of ​​the packaging part, improve the structural defects of the overflowing glue area, thereby greatly improving the packaging strength of the packaging part of the battery cell, and improving the reliability and safety of the battery core.

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 Patents(China)
IPC IPC(8): H01M50/105H01M50/184H01M10/0525H01M10/058H01M50/119H01M50/121H01M50/124H01M50/183H01M50/557
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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