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Method for selecting capacity by voltage of lithium ion battery and its application
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A lithium-ion battery, charging capacity technology, applied in the field of lithium-ion batteries, can solve the problems of long charging and discharging time, prone to misjudgment, large test error, etc., to reduce the number of equipment and labor, reduce energy loss, and misjudgment low probability effect
Active Publication Date: 2019-06-28
ZHENGZHOU BAK BATTERY CO LTD +1
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[0007] The purpose of the present invention is to solve the problems existing in the existing lithium-ion battery capacity sorting process, such as large test error, imprecise, prone to misjudgment, difficulty in effective quantitative analysis, and long charging and discharging time, to provide a lithium-ion battery voltage The method and application of selecting capacity
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Embodiment 1
[0057] This embodiment relates to a type A battery with a nominal capacity of 3100mAh, which adopts a high-temperature precharging process at 50°C. After precharging, the voltage is used to select the capacity at 50°C. The target voltage for shipment is 3.90V-3.95V.
[0058] (1) At a temperature of 50±2°C, use a constant current of 0.05C A to charge for 91 minutes, use a current of 0.5C A to charge to 4.35V with a constant current and constant voltage, and a cut-off current of 0.02C A to measure the charging capacity C 0 ;
[0059] (2) Move the battery to a normal temperature environment, and after 5 hours of storage, use a 0.5C A current to discharge to 3.0V, and the discharge capacity is C 1 , and use C 0 with C 1 The difference is divided by the discharge capacity C 1 Find the first loss c%;
[0060] (3) At room temperature, charge the battery with 0.5C A constant current and constant voltage to 3.90V (voltage lower limit), cut-off current 0.02C A, and the measured char...
Embodiment 2
[0074] This embodiment relates to a B-type battery with a nominal capacity of 2200mAh. It uses a 75°C high-temperature precharge process. After the precharge is completed, the voltage is used to select the capacity under the condition of 75°C. The shipping target voltage is 3.95V-4.00V.
[0075] (1) At a temperature of 75±2°C, charge with a constant current of 0.05C A for 91 minutes, charge with a constant current and constant voltage of 1.0C A to 4.35V, cut off the current at 0.02C A, and measure the charging capacity C 0 ;
[0076] (2) Move the battery to a normal temperature environment, and after 5 hours of storage, use a 0.5C A current to discharge to 3.0V, and the discharge capacity is C 1 , and use C 0 with C 1 The difference is divided by the discharge capacity C 1 Find the first loss c%;
[0077] (3) At room temperature, charge the battery with 0.5C A constant current and constant voltage to 3.90V (voltage lower limit), cut-off current 0.02C A, and the measured ch...
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Abstract
The invention belongs to the technical field of a lithium ion battery, and specifically discloses a voltage-based lithium ion battery capacity selection method and an application thereof. The method at least comprises the steps of performing measurement and processing on the initial charging capacity loss proportion of the lithium ion battery; performing measurement and processing on the relationbetween different states of charge and voltages of the lithium ion battery; performing measurement and processing on the relation between different temperatures and voltages of the lithium ion battery; performing measurement and processing on the relation between voltages and time after the battery is charged or discharged; and performing equation fitting treatment on the obtained data and performing battery capacity selection according to a fitting equation. The method is effective, accurate and capable of realizing quick battery capacity selection.
Description
technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for selecting capacity by voltage of a lithium-ion battery and an application thereof. Background technique [0002] With the development of society and the improvement of people's requirements for environmental protection, lithium-ion batteries with high energy density and environmental protection are more and more used in people's lives. The increase in demand for lithium-ion batteries has triggered the continuous opening and expansion of lithium-ion battery factories, and the continuous production of new lithium-ion battery factories and the expansion of production by established companies have also made the competition in the lithium-ion battery industry more and more fierce. . Capacity is one of the most important indicators of lithium-ion batteries. Therefore, in the process of producing lithium-ion batteries, it is often necessary to screen the capa...
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