A battery SOC estimation method and system
A technology of batteries and battery packs, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as recovery, vehicle inability to drive, battery damage, etc., and achieve the effect of improving estimation accuracy
Active Publication Date: 2022-01-07
SHAANXI J&R FIRE FIGHTING CO LTD
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Problems solved by technology
[0003] However, some of the reduced capacity will recover as the battery temperature rises
Therefore, when estimating the SOC of the battery, if the influence of the battery temperature is ignored, the battery has reached the cut-off voltage when the SOC (State of Charge, state of charge) is high, which will cause the vehicle to be unable to drive, and even cause battery damage
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[0017] In order to make the object, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.
[0018] see figure 1 , is a functional block diagram of the electric vehicle 99 including the battery SOC estimating system 200 provided by the present invention. The electric vehicle 99 includes a battery pack 100 , a battery SOC estimation system 200 , a memory 300 and a processor 400 . The battery pack 100 is used to provide power for the electric vehicle 99 . In this embodiment, the battery pack 100 includes several single batteries. The battery SOC estimation system 200 includes an acquisition module 10 , a table look-up module 20 and a calc...
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The present invention provides a battery SOC estimation method, comprising the following steps: collecting the temperature T and charge and discharge current I of the plurality of single cells; looking up the charge and discharge efficiency according to the charge and discharge current I and temperature T of the single cells n T ; Calculate the relative SoC of the cell R According to the charging and discharging current I of the single battery and the temperature T look-up table, the charging capacity Q under the temperature T is obtained respectively CT and discharge capacity Q DT ; Calculate the recoverable unusable charging capacity and recoverable unusable discharge capacity of the single battery at the temperature T Calculate the SoC of the single battery at the current temperature T T . The method for estimating the battery SOC provided by the present invention can calculate the SOC at the current temperature according to the temperature change, thereby ensuring the accuracy of the battery SOC at different temperatures. The invention also provides a battery SOC estimation system.
Description
【Technical field】 [0001] The present invention relates to the technical field of battery management systems, in particular to a battery SOC estimation method and system. 【Background technique】 [0002] The usable capacity of lithium iron phosphate battery is closely related to temperature and discharge rate, because its ohmic internal resistance and polarization internal resistance at low temperature are much larger than its ohmic internal resistance and polarization internal resistance at normal temperature, which leads to phosphoric acid The available capacity of iron-lithium batteries at low temperatures is seriously affected by temperature and discharge rate. For setting the same charge cut-off voltage and discharge cut-off voltage, the charging capacity of the battery will be different when it reaches the charge cut-off voltage at different temperatures, especially at low temperature, its charge capacity is only 70% of that at normal temperature, or even less than 70%. ...
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IPC IPC(8): G01R31/367G01R31/382
CPCG01R31/367G01R31/387
Inventor 孔满
Owner SHAANXI J&R FIRE FIGHTING CO LTD