Residual battery capacity estimation management system and method

A technology of battery remaining capacity and management system, applied in the field of battery remaining capacity estimation management system, can solve the problems of error, complex algorithm, large estimation deviation, etc., to avoid overcharge and overdischarge, improve estimation accuracy, and prolong the cycle.

Active Publication Date: 2016-01-13
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They each have their own scope of application and advantages and disadvantages: the open circuit voltage method is simple and convenient, but it can only be used when the battery pack is not loaded, and cannot be applied to the charging and discharging process; the ampere-hour integration method is widely used, but each time the current collection process Both will introduce measurement errors, and will become larger and larger as time goes by, resulting in larger and larger estimation deviations; the Kalman filter method has high accuracy, but due to the need to est

Method used

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  • Residual battery capacity estimation management system and method
  • Residual battery capacity estimation management system and method
  • Residual battery capacity estimation management system and method

Examples

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Embodiment 1

[0062] Such as Figure 1 ~ Figure 3 As shown, a battery remaining capacity estimation management system includes a power supply module, an acquisition module, a storage module, a timing module, a communication module, an alarm display module, a clock module, a connector and a relay module, and an MCU control module; the acquisition module , a storage read-write module, a timing module, a communication module, an alarm display module, a clock module, a connector and a relay module, and an MCU control unit are respectively electrically connected to the power supply module; The module, the alarm display module and the clock module are respectively electrically connected to the MCU control module;

[0063] The power module is used to generate stable and reliable multi-channel DC power on the basis of input power;

[0064] The acquisition module is composed of a voltage acquisition module, a current acquisition module, and a temperature acquisition module. The voltage acquisition ...

Embodiment 2

[0110] Such as Figure 1 ~ Figure 3 As shown, a battery remaining capacity estimation management system and method, wherein the battery remaining capacity estimation management method includes a battery remaining capacity estimation management system, the battery remaining capacity estimation management system in this embodiment is the same as the system in Embodiment 1, here No longer repeat.

[0111] Such as Figure 1 ~ Figure 3 As shown, a battery remaining capacity estimation management method, the method steps are as follows:

[0112] 1) After initialization, the acquisition module obtains the voltage array U[n] of the single battery ("n" is the number of single batteries contained in the battery pack) and the temperature array Tem[n] according to the data acquisition cycle "T_COL", Stored in the storage module; from the SOC estimation period "T_SOC", to obtain the total current array I of the battery pack pack [c], ambient temperature array Tem _ envi[c], stored in t...

Embodiment 3

[0146] Such as Figure 1 ~ Figure 3 As shown, a battery remaining capacity estimation management system and method, wherein the battery remaining capacity estimation management method includes a battery remaining capacity estimation management system, the battery remaining capacity estimation management system in this embodiment is the same as the system in Embodiment 1, here No longer repeat.

[0147] Such as Figure 1 ~ Figure 3 As shown, a battery remaining capacity estimation management method, the method steps are as follows:

[0148] The system and method involved in the present invention will be described in detail below for a lithium iron phosphate battery (48V\50AH) used in an electric vehicle (ambient temperature is 25°C, each group contains 15 single cells connected in series, the data acquisition period is set to 500ms, SOC The estimation period is set to 36s, taking the estimation period of the non-initial power-on in the discharging state as an example):

[01...

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Abstract

The invention discloses a residual battery capacity estimation management system and method. Application condition of open-circuit voltage capacity estimation is fully taken into consideration, and under the condition of meeting the use condition, fine multi-temperature-range OCV data accuracy is utilized to make up for the error due to long-time ampere-hour integration, and thus estimation precision is improved; meanwhile, under the condition of not meeting the OCV condition, platform period and mutation period judgment is introduced; in the platform period, estimation is carried out through an ampere-hour integration method; and in the mutation period, estimation is carried out through an interpolation method, and corresponding early warning processing is carried out, thereby preventing overcharging/overdischarging of a battery effectively, prolonging the recycle service life, and reducing accident risk. The two cases above are measured through test, and influence of different temperatures and aging factors is obtained; and corresponding correction processing is carried out on estimated value, and thus estimation precision is further improved.

Description

technical field [0001] The invention relates to a battery state of charge judgment and remaining capacity estimation system and method, in particular to a battery remaining capacity estimation management system and method. Background technique [0002] The increasingly severe environmental pollution and energy crisis have accelerated the popularization and development of electric vehicles. [0003] During the use of electric vehicles, it is necessary to monitor the state of charge (StateOfCharge, referred to as SOC) of the battery pack in real time and accurately estimate the remaining capacity of the battery. An important factor in the safety of people and vehicles. [0004] It can be seen from the charge and discharge characteristic curve of the battery that there is a period of rapid rise and fall of the battery voltage in the initial stage and the end stage of charge and discharge respectively, except for other stages, the voltage changes little and is relatively stable...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCY02E60/10
Inventor 李珣
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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