Method for self-discharge screening of lithium ion battery
A lithium-ion battery, self-discharge technology, applied in the field of lithium-ion screening, can solve problems such as high self-discharge rate, and achieve the effect of improving accuracy and eliminating error values
Inactive Publication Date: 2018-08-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
View PDF6 Cites 10 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
One is the impact of storage time. As mentioned above, the longer the time, the capacity balance between the positive and negative electrodes of the lithium battery will be gradually broken and deepened, and the decomposition reaction of the electrolyte will also accumulate some irreversible capacity loss.
Therefore, the longer the storage time, the greater the self-discharge rate
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 moreExamples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] In this embodiment, a method for self-discharge screening of lithium-ion batteries comprises the following steps:
[0019] Step 1: The battery undergoes high-temperature aging after formation to form a stable SEI film, and then performs secondary liquid replenishment to meet the requirements of the total liquid injection volume of the battery.
[0020] The formation of a stable SEI film in this step can ensure the quality of the battery and the subsequent capacity development and battery performance will have a certain impact, and provide a stable sample battery for self-discharge screening.
[0021] Step 2: Divide the capacity of the battery on the cabinet, charge and discharge it twice with 1C current, and obtain its capacity value C0;
[0022] Step 3: After the battery capacity is divided, put it on the test cabinet for 7 days, and record the voltage change value in real time;
[0023] Step 4: Test the capacity recovery and maintenance of the battery after 7 days of...
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 relates to a method for self-discharge screening of a lithium ion battery. The method comprises the following steps that (1) after a formed battery is subjected to high-temperature agingto form a stable SEI film, secondary liquid supplementing is carried out on liquid, and the requirement for the total liquid injection amount of the battery is met; (2) sealing cleaning is carried out on the battery; (3) partial volume in a cabinet is carried out on the battery, and charging and discharging circulation treatment is carried out; (4) after the partial volume of the battery is finished, shelving is carried out, and a voltage change value is recorded in real time; (5) capacity recovery and maintenance test is carried out on the battery after the shelving is finished, and the self-discharge rate of the capacity is calculated compared with the initial capacity of the pre-shelving battery; and (6) the self-discharge rate and the change value of the voltage in the shelving time are used as the basis of a self-discharge screening value K. According to the method, the error value caused by temperature and manual operation can be eliminated, the accuracy of the measuring resultis improved, and a certain basis is provided for subsequent product matching.
Description
technical field [0001] The invention relates to the technical field of lithium ion screening, in particular to a method for self-discharge screening of lithium ion batteries. Background technique [0002] With the shortage of energy and the deterioration of the environment, new energy technologies are being used and promoted more and more. Among them, lithium-ion battery has been developed rapidly due to its high energy density, low self-discharge, good cycle performance, and environmental friendliness. [0003] Lithium battery self-discharge refers to the phenomenon of voltage drop when the battery is left standing in an open circuit. In lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, and ternary material electrodes, the phenomenon of lithium battery self-discharge is inevitable. [0004] Lithium-ion battery self-discharge is divided into two types according to whether the capacity loss is reversible: capacity loss is reversible, which means that the...
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): B07C5/344
CPCB07C5/344
Inventor 郑洁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY