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An equalization method and battery pack technology, applied in charge equalization circuit, battery circuit device, secondary battery charging/discharging, etc., can solve problems such as voltage method can not balance power, SOC method power balance error, etc.
Active Publication Date: 2018-09-14
SHANGHAI LANNUO NEW ENERGY TECH CO LTD
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to overcome the problem that in the prior art, only the voltage method or the SOC method is used to perform power balance operation on the batteries in the battery pack, and the voltage method cannot perform power balance in the entire working range of the battery, or the SOC method There are defects such as large power balance error, and the purpose is to provide a battery pack power balance method and system
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Embodiment 1
[0087] Such as figure 1 As shown, the power balance method of the battery pack in this embodiment includes:
[0088] S101. Obtain the first state parameter of the battery pack and the resting time of the battery pack;
[0089] Wherein, the first state parameter includes the current charge value of the battery pack, the current open circuit voltage, and the temperature value of each cell of the battery;
[0090] The access signal of the calibration tool and the SOH (State of Health, state of health) data sent by other modules in the battery management system BMS in the battery pack can also be obtained as required.
[0091] S102. According to the ratio between the current charge value of the battery pack and the current open-circuit voltage, determine the power balance mode of the battery pack;
[0092] Wherein, the ratio between the current charge value of the battery pack and the current open circuit voltage is the slope of the corresponding SOC-OCV curve of the battery pac...
Embodiment 2
[0172] Such as Figure 4 As shown, the power balance system of the battery pack in this embodiment includes a first state parameter acquisition module 1, an equalization mode determination module 2, a second state parameter acquisition module 3, a first judgment module 4, an equalization target determination module 5, an equalization An operation module 6 , a time acquisition module 7 and a second judging module 8 .
[0173] The first judging module 4 includes a first judging unit 41 and a second judging unit 42;
[0174] The first state parameter acquisition module 1 is used to acquire the first state parameter of the battery pack.
[0175] The time acquiring module 7 is used to acquire the resting time of the battery pack.
[0176] Wherein, the first state parameter includes the current charge value of the battery pack, the current open circuit voltage, and the temperature value of each battery cell; the calibration tool access signal and the battery management system BMS ...
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Abstract
The invention discloses a battery pack capacity balancing method and system. The method comprises: S1, acquiring first state parameters of a battery pack; S2, determining a capacity balance mode of the battery pack according to a ratio of a current charged value of the battery pack to a current open-loop voltage; S3, calculating second state parameters of battery cells of the battery pack according to the capacity balance mode; S4, judging whether the battery pack requires capacity balance operation according to the second state parameters, and continuing step S5 if yes; S5, determining a target cell that requires balanced capacity and capacity value of the target cell to be balanced, according to the second state parameters; S6, performing capacity balance operation on the target cell according to the capacity value. The battery pack capacity balancing method and system have the advantages that a working region of a whole battery pack can be subjected to capacity balancing, uniformityof the cells in the battery pack can be ensured more accurately to greater extent, and working performance of the battery pack is improved accordingly.
Description
technical field [0001] The invention relates to the technical field of battery management, in particular to a method and system for balancing battery pack electricity. Background technique [0002] In the actual production process, due to factors such as manufacturing errors and differences in the use environment (such as temperature differences) of the battery cells, there will inevitably be manufacturing differences between the cells, which will inevitably lead to differences between the cells. , that is, there is a battery inconsistency problem. When the cells are packaged into a battery pack, due to the uneven temperature distribution of the battery pack under working conditions, the aging degree of the single cells will be different, which will further increase the difference between the cells and make each battery in the battery pack The voltage and capacity of the battery cells are different, which eventually leads to the fact that the battery pack cannot fully utili...
Claims
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