Battery electrical state monitoring system and electrical state monitoring method
A state monitoring system and battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as accelerating the deterioration speed, reducing battery life, and affecting the balance of charge and discharge of multiple batteries
Active Publication Date: 2021-01-26
HITACHI LTD
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Problems solved by technology
[0006] However, if the electrical state of the battery is unknown or the calculation error of the electrical state is large, such as a large error in SOC, it will affect the normal charging plan of the battery, cause overcharging or overdischarging of the battery, and reduce the life of the battery
[0007] Due to the limited capacity of a single battery unit, in practical applications, multiple battery units are often connected together. In this case, if the electrical state is unknown or the calculation error of the electrical state is large, it will affect the relationship between multiple batteries. Charge-discharge equalization causes some batteries to be overcharged or over-discharged, accelerates the deterioration rate, and reduces the overall stability and safety of the battery pack
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[0057] The electrical status monitoring system of the battery of the present invention consists of figure 1 shown.
[0058] 101 is a battery system composed of one or more batteries, mainly including battery packs and charging equipment. figure 1 It is shown that a plurality of batteries form a battery pack and there are multiple battery packs, but actually it may be a battery pack composed of multiple batteries, or there may be only one battery. The batteries here are rechargeable and dischargeable batteries of various types such as lead-acid batteries and lithium-ion batteries that can be charged and discharged.
[0059] 102 is a charge and discharge control command unit of the battery system, and the charge and discharge control command unit 102 is used to calculate and provide a charge and discharge control command of the battery. If the current or future charge and discharge control command of the monitored battery already exists, the charge and discharge control comman...
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The present invention provides an electrical state monitoring system and method of a battery that only utilizes the daily application data of the battery to monitor the more accurate electrical state of the battery. The discharge control command unit; the electrical characteristic acquisition unit establishes an electrical state model based on the equivalent circuit of the battery, and calculates the difference between the parameter value during charging and discharging of the battery within a specified period of time and the actual parameter value during charging and discharging according to the electrical state model The sum is used as the error, and the electrical state model is optimized according to the error, so that the error is less than the specified threshold, and the electrical characteristic parameters of the battery are obtained according to the optimized electrical state model; and the SOC acquisition part responds to the battery charge and discharge control command using Based on the obtained electrical characteristic parameters, the charging and discharging of the battery is simulated according to the optimized electrical state model, and the SOC value of the battery is obtained by making statistics on the simulated charging and discharging current.
Description
technical field [0001] The invention relates to a battery electrical state monitoring system and an electrical state monitoring method, in particular to an electrical state monitoring system and an electrical state monitoring method which only use daily application data of the battery to monitor and obtain a more accurate electrical state of the battery. Background technique [0002] Batteries are increasingly used in a digital society. Especially in areas with strict requirements on emissions, noise levels, size, etc., batteries are often irreplaceable. [0003] The electrical state of the battery includes internal electrical characteristics, state of charge (SOC, State of Charge), etc., wherein the internal electrical characteristics include the internal resistance, internal capacitance, internal inductance, etc. of the battery, and the state of charge represents the remaining electric energy of the battery. [0004] As the energy source of a device or system, the power s...
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IPC IPC(8): G01R31/382
CPCG01R31/382G01R31/387
Inventor 单联柱
Owner HITACHI LTD