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Electric quantity correction and control method of lithium ion power storage battery

A technology of power battery and calibration method, which is applied in the direction of battery circuit device, measurement of electric variables, and measurement of electricity, etc., which can solve problems such as abnormal use of batteries, large deviations in estimation results, and SOC estimation errors, etc.

Active Publication Date: 2012-10-31
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) Due to the consistency of the single battery, the discharge curve of each battery is slightly different, especially for batteries with poor power characteristics in the battery pack, using this method to estimate SOC is easy to cause overcharge and overdischarge
[0011] (2) For batteries with particularly flat discharge curves, such as lithium-ion batteries made of certain electrode materials, open circuit voltage measurement errors can lead to large SOC estimation errors
[0012] (3) Obtaining the open-circuit voltage of the battery requires the battery to stand for a long time. If the standing time is too long, the battery cannot be used normally, and if the standing time is too short, the battery cannot reach a stable open-circuit state, resulting in a large estimation result deviation

Method used

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  • Electric quantity correction and control method of lithium ion power storage battery
  • Electric quantity correction and control method of lithium ion power storage battery
  • Electric quantity correction and control method of lithium ion power storage battery

Examples

Experimental program
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Embodiment 1

[0031] figure 1 Shown is a preferred embodiment of a circuit implementing the invention. The circuit 17 includes a display 12, a charging and discharging circuit 16, a voltage monitoring circuit 13, a current monitoring circuit 15, a temperature monitoring circuit 14 and a main controller circuit with a microprocessor, a memory, a timer, a counter and the like. The specific implementation method is as follows:

[0032] 1) Connect the battery 18 and the charging and discharging circuit 16 in a conventional way;

[0033] 2) connect the control circuit 11 comprising a single-chip microcomputer or a similar chip and the charge-discharge circuit 16 in a conventional manner;

[0034] 3) The conventional connection between the battery 18 and the control circuit 11 includes the voltage monitoring circuit 13, the current detection circuit 15 and other parameter devices, and the conventional connection of the parameter circuit 14 for monitoring temperature and the like and the device ...

Embodiment 2

[0037] figure 2 Shown is how to use battery current, terminal voltage, temperature and other parameters to determine the power parameters. The specific implementation method is as follows:

[0038] 1) The difference voltage calculation device 205 receives the first terminal voltage measured by the voltage detection device 202 in the first cycle, and receives the second terminal voltage measured by the voltage detection device 202 in the second cycle, during which the timing device 203 records two measurements Periodic time intervals, the current detection device 204 measures and records the magnitude of the charging current;

[0039] 2) remove the value of the first terminal voltage from the second terminal voltage to obtain the differential voltage DELTA-L;

[0040] 3) Compare the differential voltage DELTA-L with the cut-off differential voltage DELTA-VH recorded or preset in the threshold limiting device 201, if DELTA-L≥DELTA-VH, then the threshold voltage recording devi...

Embodiment 3

[0045] image 3 (a) and (b) list the charging curves of 55Ah lithium-ion batteries at 55°C and normal temperature at 25°C. The differential voltages of these curves are provided by manufacturers of lithium-ion batteries.

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Abstract

The invention provides an electric quantity correction and control method of a lithium ion power storage battery. The method comprises the following steps: first, charging the lithium ion battery according to a standard charging system, periodically measuring the terminal voltage of the battery, and in measurement of the voltage, determining the electric quantity parameters of battery by using the difference voltage DELTA-VH, correcting the electric quantity of the battery, and determining the cycle index equivalent, the degree of aging or the healthy state of the battery at this time by using the terminal voltage; then, displaying the information to the user of the battery so that the user of the battery can know the current state of the battery (such as the current maximum charging capacity and healthy state of the battery); and finally, carrying out a controlled discharge process on the battery so that the battery or battery pack works at the optimal SOC interval and reaches a specified range of residual capacity. The electric quantity correction and control method of the lithium ion power storage battery provided by the invention is adapted to electric quantity management of pure electric automobiles (EV) and hybrid electric automobiles (HEV), and by using the method, the service life of the battery can be prolonged.

Description

technical field [0001] The invention relates to a method for correcting and controlling the electric quantity (SOC) of a lithium-ion power storage battery, which is suitable for estimating and correcting the SOC of a power storage battery for a hybrid electric vehicle (HEV), so as to control the SOC within the optimum use range and avoid battery overcharge or overdischarge phenomenon. Belongs to the technical field of rechargeable lithium-ion power batteries Background technique [0002] The development of batteries for electric vehicles (EV) and hybrid electric vehicles (HEV) has made people pay more attention to high-energy and high-power battery systems. Factors restricting the practical application of high-energy and high-power batteries include single battery performance consistency, high-temperature performance, SOC estimation, actual operating life and price, among which SOC estimation is related to the correct use of the battery pack and affects the actual operation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00G01R31/36
Inventor 张华辉刘文叔娄豫皖夏保佳田方
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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