Open formation method of full-tab steel shell cylindrical battery
A technology of cylindrical battery and formation method, which is applied in the direction of cylindrical shell batteries/batteries, secondary batteries, electrochemical generators, etc., which can solve problems such as cumbersome procedures, affecting battery cycle performance, and potential safety hazards, and achieve excellent cycle effects Effect
Active Publication Date: 2021-12-03
DALIAN CBAK POWER BATTERY CO LTD
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0007]
At present, the commonly used sealing formation method will cause the gas generated during the formation to be unable to be removed, which will affect the cycle performance of the battery. However, the open formation method proposed by the prior art also has defects such as cumbersome procedures and potential safety hazards.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0032] This embodiment provides an opening formation method for a cylindrical battery with a full tab steel case, and its process flow chart is as follows figure 1 As shown, the specific steps are as follows:
[0033] Step 1. Pretreatment before chemical formation: measure the moisture content of the coiled pole piece of the cylindrical battery with a full-lug steel shell (the positive electrode material is iron lithium material, and the negative electrode material is graphite), and after confirming that the moisture content of the cored pole piece is less than 300ppm, inject liquid, the liquid injection volume is 80% of the total liquid injection volume, after the liquid injection, it is aged at room temperature, the aging temperature is 25°C, the vacuum degree is -0.1 to -0.085Mpa, fully infiltrates the pole piece and stabilizes (the time is about 12h );
[0034] Among them, the liquid injection method is a cycle method of vacuuming (vacuum size range -0.1 to -0.085Mpa), pr...
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
Login to View More Abstract
The invention provides an open formation method of a full-tab steel-shell cylindrical battery. The open formation method comprises the following steps: after the liquid injection amount of the full-tab steel-shell cylindrical battery reaches 80-85% of the total liquid injection amount, sequentially carrying out open formation and aging, and after the aging is finished, carrying out liquid injection of the residual liquid injection amount, and sealing. When the liquid injection amount is 80-85% of the total liquid injection amount, opening formation is carried out under specific conditions, then aging, liquid injection of the remaining liquid injection amount and sealing are carried out, gas generated in the formation process can be effectively eliminated, the formation process is not complex, the potential safety hazards that sealing is not in place, and electrolyte is prone to splashing are avoided, and the cycle effect of the obtained battery is better than that of a conventional sealing formation method.
Description
technical field [0001] The invention relates to the technical field of batteries, in particular to an opening forming method for a cylindrical battery with a full tab steel case. Background technique [0002] All-tab steel shell cylindrical batteries are very popular in the market due to their advantages such as good rate performance, low cost, and good safety performance. [0003] At present, the common manufacturing process of all-tab steel shell cylindrical batteries is liquid injection-sealing-aging-forming-aging-dividing capacity. However, this process has certain defects, that is, the gas generated inside the battery cannot be eliminated during the forming process. At that time, the gas generated during the formation will stay inside the full-lug steel shell cylindrical battery. As the cycle progresses, the gas inside the battery will increase, and the distance between the positive electrode, negative electrode, and separator will become farther and farther. , the phe...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/04H01M10/0525
CPCH01M10/0422H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 安敏俊薄晋科姚登云张良宫颂曹仕良
Owner DALIAN CBAK POWER BATTERY CO LTD