A method for assessing capacity loss during storage of lithium-ion batteries
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A lithium-ion battery, capacity loss technology, applied in the field of electrochemistry, can solve the problem of lack of effective judgment of capacity attenuation, and achieve the effect of saving test cost, high accuracy, and prolonging the service life
Active Publication Date: 2021-10-26
TIANJIN LISHEN BATTERY +1
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Problems solved by technology
[0006] However, there is currently no method that can analyze the capacity fading mechanism of lithium-ion batteries, and lacks an effective judgment on the capacity fading of lithium-ion batteries during storage.
Method used
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[0057] see Figure 2 to Figure 5 As shown, for a square lithium-ion power battery (rated capacity is 51Ah), the battery needs to be implemented figure 1 The various steps in , are performed to assess capacity loss during its storage.
Embodiment approach
[0058] Concrete implementation scheme is as follows:
[0059] The first step is to take a battery and measure its OCV (open circuit voltage, Open circuit voltage) under different SOC (state of charge), so as to fit the OCV curve of the battery under different SOC (such as figure 2 ),which is
[0061] (Where V is the open circuit voltage, x is the state of charge);
[0062] The second step is to take 7 batteries for storage, and charge and discharge the batteries to be stored according to the current of 51A to calibrate the actual capacity C before storage. 0-1 , C 0-2 ,...,C 0-7 ;
[0063] The third step is to adjust the 7 batteries to be stored to 15%, 35%, 55%, 70%, 85%, 95%, and 100% SOC respectively. At this time, the battery storage capacity is C before-1 , C before-2 ,...,C before-7 , the voltage V was measured after sufficient static 0-1 , V 0-2 ,...,V 0-7 ;
[0064] ...
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Abstract
The invention discloses a method for evaluating the capacity loss of a lithium-ion battery during storage, comprising the steps of: measuring and fitting OCV curves of a battery under different SOCs; performing a charge-discharge test according to a 1C current before storage, and calibrating the actual battery before storage. capacity C 0 ;Adjust the battery to the specified SOC, at this time the storage capacity is C before , the voltage V before storage is measured after sufficient standing 0 ; Store the battery for a preset duration; remove the battery after storage and measure the voltage V 1 ; Calculate its theoretical state of charge x before storage 0 and the theoretical state of charge after storage x 1 ;Discharge test, the discharge power is C after ;Recharge and discharge test, the discharge capacity is C 1 ; Calculate and judge the capacity loss during battery storage. The method of the present invention can judge the loss of battery capacity without damaging the battery, and has guiding significance for the study of calendar life, the selection of long-term storage SOC, and the like.
Description
technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for evaluating capacity loss of a lithium-ion battery during storage. Background technique [0002] Lithium-ion batteries are widely used in 3C digital fields such as mobile phones and notebook computers due to their high energy density and long service life. At present, the global new energy vehicle market has entered a rapid development channel. Driven by the rapid development of the global new energy vehicle market, the field of power batteries has become the main factor driving the rapid growth of the global lithium-ion battery market in recent years. [0003] Lifespan is one of the important indicators to consider the performance of lithium-ion batteries, especially one of the most critical indicators for lithium-ion batteries used in automobiles, mainly due to the owner's consideration of the service life and mileage of the vehicle. According to this req...
Claims
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