Battery cycle performance accelerating and evaluating method

A battery cycle, battery technology, applied in the direction of secondary battery repair/maintenance, measurement of electricity, measurement of electrical variables, etc., can solve the problems of resource, energy waste, and increase the cost of battery cycle performance evaluation, so as to reduce production costs and increase market. Application prospect, effect of significant production practical significance

Inactive Publication Date: 2013-04-03
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It takes such a long time to evaluate the cycle performance of the battery, which can be described as a waste of resources and energy, which greatly increases the evaluation cost of the battery cycle performance.

Method used

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  • Battery cycle performance accelerating and evaluating method
  • Battery cycle performance accelerating and evaluating method
  • Battery cycle performance accelerating and evaluating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]The preset discharge voltage is 4.0V. The charging system remains unchanged, so that lithium ions can be inserted into the negative electrode as saturated as possible, the discharge voltage is set to 4.0V, keep shallow charging and shallow discharge for 49 times, fully discharge to 3.0V at the 50th time, 50 times a cycle, cycle 10 cycle at 25°C for 500 cycles; cycle 8 for 400 cycles at 45°C. The specific charging and discharging cycle system is shown in Table 2.

[0046] Table 2: Cycling test conditions for Example 1.

[0047]

[0048]

[0049] A charging and discharging cycle is 1 hour and 15 minutes, and it takes 29 days to complete according to the requirement of 500 cycles.

Embodiment 2

[0051] The preset discharge voltage is 3.8V (below the voltage platform). The method is the same as that of Example 1, the discharge voltage of the limited shallow discharge and shallow charge is 3.8V, and the specific charge and discharge cycle system is shown in Table 3.

[0052] Table 3: Cycling test conditions for Example 2.

[0053]

[0054]

[0055] A charging and discharging cycle is 2 hours and 30 minutes, and it takes 1 month and 22 days to complete according to the requirement of 500 cycles.

Embodiment 3

[0057] The preset discharge voltage is 4.0V and the discharge current is 1C. Under the conditions of the method in Example 1, increase the discharge current to 1C, and discharge the lithium ions on the negative electrode to the positive electrode through the diaphragm, which will basically not damage the battery. Therefore, the discharge current can be increased, but the current should be smaller than that in the specification. Indicated maximum discharge current. For the experimental battery in the present invention, 1C is the maximum discharge current, therefore, this embodiment selects 1C as the discharge current. The specific charging and discharging cycle system is shown in Table 4.

[0058] Table 4: Cycling test conditions for Example 3.

[0059]

[0060]

[0061] A charging and discharging cycle is 1 hour, and it takes 21 days to complete according to the requirement of 500 cycles.

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PUM

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Abstract

The invention discloses a battery cycle performance accelerating and evaluating method. The battery cycle performance accelerating and evaluating method includes: step 1, charging a battery till the battery is fully charged; step 2, discharging the battery in real time; step 3, increasing the discharging voltage of the battery to a preset discharging voltage when a first preset charge state is reached during discharging, returning to the step 1 when the battery voltage is discharged to a second preset charge state, and repeating in cycles and looping for times preset by a user. By the aid of the battery cycle performance accelerating and evaluating method, the battery cycle performance can be conveniently and reliably evaluated, cycle time can be shortened, evaluation cost for the battery cycle performance is reduced, producing cost of the battery is lowered, market application prospect of products manufactured by battery manufacturers is benefited, and great production practical significance is provided.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for accelerating evaluation of battery cycle performance. Background technique [0002] At present, lithium-ion batteries have the advantages of high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras, and laptop computers, but also widely used in electric vehicles and electric bicycles. And large and medium-sized electric equipment such as electric tools. [0003] For batteries, cycle performance is one of the important factors to evaluate the quality of batteries. Various batteries have different requirements for the number of cycles. Mobile phone batteries require 500 cycles at room temperature, leaving 80% of the capacity remaining. Some notebook batteries require 800 cycles, while power batteries require 2,000 to 3,000 cycles. It takes time to complete the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/42
CPCY02E60/10
Inventor 王颖王玉虎程君金江敏张宏芳王晓梅
Owner TIANJIN LISHEN BATTERY
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