Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A cylindrical battery case

A technology for cylindrical batteries and battery shells, which is applied to battery boxes/covers, battery pack components, battery box/cover materials, etc., and can solve the problems of detachment of winding core and tabs, poor lateral stop effect, and disconnection of welding points, etc. problems, to achieve the effect of improving cycle performance, avoiding solder joint disconnection, and inhibiting deformation

Active Publication Date: 2018-10-16
国轩新能源(庐江)有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cylindrical winding core may shake inside the battery case. When the shaking is severe, the welding point between the winding core tab and the battery top cover or the case will be disconnected, and the winding core and the tab will be separated, which will eventually lead to the battery’s circuit breaker.
There are generally two ways to solve the above problems, one is to increase the filling degree of the battery, but a larger filling degree will make it difficult for the winding core to enter the shell, the electrolyte infiltration speed is slow, and it is not easy to automate production; the other is to increase the filling degree of the battery. A stop frame is added to the top of the core. The addition of the stop frame can better restrain the longitudinal movement of the core, but the suppression effect on the lateral movement of the core is not obvious enough, especially for larger cylindrical batteries. The lateral stop effect of the core will be worse

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A cylindrical battery case
  • A cylindrical battery case
  • A cylindrical battery case

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] To make 32131 type (diameter 32mm, height 131mm) cylindrical battery, the front sectional view of the cylindrical shell used is as follows figure 1 shown. The battery case wall (1) is made of aluminum with an inner diameter of 30.8 mm. There are 6 strip-shaped polymer linings (2) attached to the battery case wall (1). The strip-shaped polymer liners (2) are evenly distributed on the battery On the inner side of the shell wall (1), the strip-shaped polymer lining (2) has a thickness of 0.05mm, a width of 4mm, and a length of 123mm, and the distance between the two ends of the strip-shaped polymer lining (2) is from the battery shell wall ( 1) The distance between the ends on the same side is 4mm. The strip-shaped polymer lining (2) is made of a blend of PAN (polyacrylonitrile) and PMMA (polymethyl methacrylate). Use LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The ternary positive electrode material is combined with artificial graphite negative electrode to make a cylindrical core w...

Embodiment 2

[0022] To make 42148 type (diameter 42mm, height 148mm) cylindrical battery, the front sectional view of the cylindrical shell used is as follows figure 2 shown. The battery case wall (1) is made of stainless steel with an inner diameter of 40.4 mm. There are three circular polymer linings (2) attached to the battery case wall (1), and the circular polymer linings (2) are evenly distributed On the inner side of the battery case wall (1), the annular polymer lining (2) has a thickness of 0.5 mm and a width of 8 mm, and the distance between the annular polymer lining (2) on both sides of the battery case wall ( 1) The distance between the ends on the same side is 10mm. The material of the annular polymer lining (2) is a blend of PAN (polyacrylonitrile) and PEO (polyethylene oxide). Use LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The ternary positive electrode material is combined with the artificial graphite negative electrode to make a cylindrical core with a diameter of 38.2mm and put i...

Embodiment 3

[0026] To make 42140 type (diameter 42mm, height 140mm) cylindrical battery, the front sectional view of the cylindrical shell used is as follows image 3 shown. The battery case wall (1) is made of ABS (acrylonitrile-styrene-butadiene copolymer), with an inner diameter of 38 mm. There are 18 dotted polymer linings (2) attached to the battery case wall (1). The dot-like polymer lining (2) is evenly distributed on the inner side of the battery case wall (1). The height of the dot-like polymer lining (2) is 0.15mm, and the diameter is 4mm. (2) The distance from the same side end of the battery case wall (1) is 10 mm. The material of the dot-like polymer lining (2) is a blend of PEO (polyethylene oxide) and PVAc (polyvinyl acetate). Use LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The ternary positive electrode material is combined with the artificial graphite negative electrode to make a cylindrical core with a diameter of 37mm and put it into the above battery case and complete the subsequ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
heightaaaaaaaaaa
Login to View More

Abstract

A cylindrical battery case consisting of a battery case wall and a polymer lining uniformly attached to the inside of the case wall. When the electrolyte is injected into the battery, the polymer lining on the inner side of the battery case wall swells and bulges, allowing it to come into close contact with the winding core. The cylindrical casing provided by the present invention can effectively avoid the sloshing of the cylindrical winding core in the casing without affecting the automatic production efficiency, and play the role of a stop. At the same time, the polymer lining on the battery casing wall can To store the electrolyte and inhibit the expansion of the winding core during the cycle, thereby improving the cycle performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a cylindrical battery case. Background technique [0002] The ratio of the cross-sectional area of ​​the cylindrical core to the internal cross-sectional area of ​​the cylindrical battery case is called the filling degree of the cylindrical battery. The cylindrical winding core may shake inside the battery casing. When the shaking is severe, the welding point between the winding core tab and the battery top cover or the casing will be disconnected, and the winding core and the tab will be separated, eventually leading to the battery's open circuit. There are generally two ways to solve the above problems, one is to increase the filling degree of the battery, but a larger filling degree will make it difficult for the winding core to enter the shell, the electrolyte infiltration speed is slow, and it is not easy to automate production; the other is to increase the filling...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/02H01M50/107
CPCH01M50/116H01M50/1243Y02E60/10
Inventor 邢军龙汪涛
Owner 国轩新能源(庐江)有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com