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Soft package lithium ion battery

A lithium-ion battery, ion battery technology, applied in battery pack components, circuits, electrical components, etc., to improve safety and stability, reduce internal short circuits in cells, and achieve high energy density.

Pending Publication Date: 2021-04-02
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the above-mentioned prior art, the present invention provides a soft-packed lithium-ion battery, which can effectively alleviate the mutual impact and extrusion between the battery cell and the shell, as well as the resulting damage and failure of the top of the shell, and the angular position of the battery cell. Improve the anti-vibration performance of the battery without losing its internal space, thereby improving the safety, stability and energy density of the battery

Method used

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preparation example Construction

[0029] Considering factors such as the ease of preparation of the housing and the battery, and the impact mitigation effect between the first top 3 and the second top 4, in one embodiment of the present invention, the above-mentioned inner arc portion 5 to the first straight portion The vertical distance H1 of 10 may be 0.1-0.4 mm.

[0030] In the present invention, one of the first surface 7 and the second surface 8 can be provided with a transition arc portion 9, one of which is not provided with a transition arc portion 9, that is, all of them are straight portions (referred to as the second straight portion). In the orthographic projection of the housing 1 parallel to its frontal direction, the first arc 5' corresponding to the inner arc portion 5 is tangent to the straight line corresponding to the second straight portion; 8 are provided with transition arcs 9, that is, the first surface 7 is provided with transition arcs 9 and first straight portions 10, and the second s...

Embodiment 1

[0039] The soft pack lithium-ion battery provided in this embodiment includes:

[0040] Such as Figure 1-Figure 3 As shown, the casing 1 and the battery cell 2 located in the casing, the battery cell 2 is provided with a first top 3, the casing 1 is provided with a second top 4 corresponding to the first top 3, and the second top 4 is notched toward The inner arc portion 5 inside the housing, the inner arc portion 5 and the front side 6 of the housing, the opposite side opposite to the front side, the first surface 7 between the front side 6 and the back side, the first surface 7 between the front side 6 and the back side The two surfaces 8 are connected, at least one of the first surface 7 and the second surface 8 is provided with a transition arc 9 connected to the inner arc 5 and a first straight portion 10 connected to the transition arc 9, the transition arc 9 with the notch facing the outside of the housing, where, as image 3 As shown, in the orthographic projection ...

Embodiment 2

[0044] The difference between this embodiment and Embodiment 1 is that the vertical distance H1 from the inner arc portion 5 to the first straight portion on the first surface 7 is 0.2 mm, and the distance H1 from the inner arc portion 5 to the first straight portion on the second surface 8 is The vertical distance H2 is 0.2mm, the central angle of the first arc 5' is 111°, the radius R2 of the second arc 9' is 10mm, the central angle of the second arc 9' is 11°, and the first top 3 The distance H3 between the part closest to the second top 4 and the part inside the second top 4 farthest from the first top 3 is 0.23mm, and the distance H4 between the battery cell 2 and the inside of the first straight part 10 on the first surface 7 is 0.65 mm, and the distance H5 from the battery cell 2 to the inner side of the first straight portion 10 on the second surface 8 is 0.05 mm.

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Abstract

The invention provides a soft package lithium ion battery which comprises a shell and a battery cell located in the shell, the battery cell is provided with a first top, the shell is provided with a second top corresponding to the first top, and the second top is an inner arc part with a notch facing the interior of the shell; the inner arc part is connected with the front face of the shell, the back face opposite to the front face, a first surface located between the front face and the back face, and a second surface located between the front face and the back face. At least one of the firstface and the second face is provided with a transition arc portion connected with the inner arc portion and a straight portion connected with the transition arc portion, and a notch of the transitionarc portion faces the outer portion of the shell. According to the soft package lithium ion battery provided by the invention, the problems of mutual impact and extrusion between the battery cell andthe shell, damage and failure of the top of the shell, deformation of corners of the battery cell and the like caused by the mutual impact and extrusion can be effectively solved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a soft pack lithium ion battery. Background technique [0002] Soft-pack lithium-ion battery is one of the commonly used battery types. It is mainly composed of cells and a casing (usually aluminum-plastic film) for packaging cells. The top of the casing is usually an inner arc with a notch facing the inside of the casing. , the inner arc is tangent to the parts at both ends, and the top of the cell basically has no radian, that is, its plane angle is basically a right angle. The encapsulation process of pouch batteries usually requires punching treatment on the casing such as aluminum-plastic film, that is, forming a punching hole on the casing, then placing the battery cell in the punching hole, and then heat-sealing the surrounding of the punching hole, so as to achieve Encapsulation of the battery. [0003] Existing pouch batteries generally have the problems that the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/105
CPCY02E60/10
Inventor 马新周邹浒
Owner ZHUHAI COSMX BATTERY CO LTD
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