Battery electric state monitoring system and battery electric 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 accelerated deterioration speed, limited capacity of a single battery unit, and affecting the balance of charge and discharge of multiple batteries
Active Publication Date: 2017-11-10
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
Method used
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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 invention discloses an accurate battery electric state monitoring system and a battery electric state monitoring method which utilize daily application data of the battery to monitor the battery. The battery electric state monitoring system comprises a charging-discharging control order part, an electric characteristic obtaining part and an SOC obtaining part; the charging-discharging control order part provides a current or a future battery charging and discharging control order; the electric characteristic obtaining part is used for establishing an electric state model based on an equivalent circuit of the battery, calculating parameter values of the battery during processes of charging and discharging in a certain period according to the electric state model, performing optimization on the electric state model according to an error, making the error smaller than a specified threshold value and obtaining electric characteristic performances of the battery according to the optimized electric state model; the SOC obtaining part is used for responding to the charging and discharging control order of the battery and simulating the charging and discharging of the battery according to the optimized electric state model and performing statistics on the simulated charging and discharging current to obtain an SOC value of the battery.
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...
Claims
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Login to View More IPC IPC(8): G01R31/36
CPCG01R31/382G01R31/387
Inventor 单联柱
Owner HITACHI LTD