Cell balancing method, system, vehicle, storage medium and electronic device
A battery equalization and equalization technology, applied in the field of control, can solve the problems of low equalization efficiency and failure to achieve equalization effects, achieve accurate equalization process, and avoid the effect of too long or too short equalization time
Active Publication Date: 2021-07-20
BYD CO LTD
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Problems solved by technology
In the process of equalizing a single battery, if the equalization time of a single battery is too long, it will increase the inconsistency of each single battery in the battery pack where it is located, resulting in low equalization efficiency; if the equalization time of a single battery If it is too short, the balance effect will not be achieved
Method used
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Embodiment approach
[0057] The first implementation mode: charge or discharge unit electricity to each single battery in the battery pack; for each single battery in the battery pack, determine the voltage change rate of the single battery The amount of change in the load voltage value as the power changes the unit power.
[0058] The second embodiment: charging or discharging each unit cell in the battery pack; for each unit cell in the battery pack, determine the voltage change rate of the unit cell to the voltage of the unit cell The amount by which the value varies by charging / discharging the cell for the stated unit of time.
[0059] In one embodiment, obtaining the voltage change rate of each single battery in the battery pack includes:
[0060] During the charging or discharging process of the battery pack, the voltage change rate of each single battery is determined to charge or discharge preset electric quantity to each single battery. The rate of voltage change is the difference betwe...
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The present disclosure relates to a battery equalization method, system, vehicle, storage medium, and electronic equipment. The method includes: obtaining the voltage change rate of a single battery to be balanced in a battery pack; obtaining a reference voltage change rate required for equalization; according to The voltage change rate of the single battery to be balanced and the reference voltage change rate determine the target equalization duration of the single battery to be balanced; according to the target equalization time length, the balance of the single battery to be balanced is controlled. Since the target equalization duration based on the equalization process is calculated based on the difference between the voltage change rate of the single battery to be balanced and the reference voltage change rate, it is more accurate, which in turn makes the equalization process more accurate and avoids over-balance situation occurs.
Description
technical field [0001] The present disclosure relates to the technical field of control, and in particular, relates to a battery balancing method, system, vehicle, storage medium, and electronic equipment. Background technique [0002] Large-capacity batteries that provide power energy for electric vehicles are often called power batteries. Vehicle power batteries generally consist of multiple single cells connected in series to form a module. With the use of the battery, the difference between the individual batteries gradually increases, and the consistency between the individual batteries is poor. Due to the short plate effect of the battery, the capacity of the battery pack is limited, so that the capacity of the battery pack cannot be fully utilized, resulting in the failure of the battery pack. Overall capacity is reduced. On the other hand, after the differences among individual batteries gradually expand, some single batteries will be overcharged and some single ba...
Claims
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IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/441H01M2010/4271H02J7/0019Y02E60/10
Inventor 罗红斌王超沈晓峰曾求勇刘苑红张祥
Owner BYD CO LTD