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Cell state supervision apparatus

A technology for monitoring devices and battery status, applied to batteries, secondary batteries, measuring devices, etc., can solve problems such as increased charging state estimation errors, and achieve the effects of reducing judgment errors, ensuring accuracy, and high precision

Inactive Publication Date: 2012-09-26
SUZUKI MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, with the method of Japanese Patent Laid-Open No. 2005-43339, the convergence value of the open circuit voltage changes when the battery cell deteriorates, thus causing an increase in the estimation error of the state of charge

Method used

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  • Cell state supervision apparatus
  • Cell state supervision apparatus
  • Cell state supervision apparatus

Examples

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Embodiment Construction

[0012] Embodiments of the present invention will now be described with reference to the drawings.

[0013] Figure 1~3 Examples of the present invention are shown. exist figure 1 In, reference numeral 1 denotes a battery unit; reference numeral 2 denotes a battery pack including at least one battery cell 1; reference numeral 3 denotes an inverter; Drive motors for motor vehicles such as hybrid vehicles. The battery pack 2 is connected to a drive motor 4 via an inverter 3 . The driving motor 4 generates driving force from the electric power supplied from the battery pack 2 via the inverter 3 during driving, drives the driving wheels of the motor vehicle using the generated driving force, and generates driving force from the driving wheels during regeneration. and supply the generated electric energy to the battery pack 2 via the inverter 3 for charging.

[0014] The battery pack 2 needs to accurately grasp the state of charge (SOC) of the battery cells 1 in order to proper...

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Abstract

A cell state supervision apparatus supervises the state of at least one cell in a cell set. The cell state supervision apparatus comprises a measure circuit measuring the state of the cess state and a caculation circuit. The measure circuit comprises a temperature measure part for measuring the temperature of the cell unit, a current measure part for measuring the current of the cell unit and a voltage measure part for measuring the voltage of the cell unit. Based on the cell temperature measured by the temperature measure part and the current measured by the current measure unit, the predetermined voltage corresponding to the predetermined charging state of the cell unit is caculated by the caculation circuit through the caculation expression predertermined by temperature secondary exponential function and temperature exponential function, the voltage of the cell unit measured by the voltage measure part is compared to the predetermined voltage calculated by the expression by the calculation circuit to determined the predetermined charging stage of the cell unit.

Description

technical field [0001] The present invention relates to a battery state monitoring device, and more particularly to a battery state monitoring device for monitoring the state of a battery cell in a battery pack as a driving energy source and estimating the state of charge of the battery cell. Background technique [0002] A motor vehicle including a battery pack as a driving energy source such as an electric vehicle (EV), a hybrid vehicle (HEV), or a plug-in hybrid vehicle (PHEV) is expected to measure the state of a battery cell and correctly calculate a state of charge (SOC). [0003] Generally, the state of charge of a battery is related to the open circuit voltage (OCV), and the state of charge can be estimated by calculating the open circuit voltage. There is a battery state monitoring device that uses a method for calculating a change amount from an initial state of charge as a state of charge using current integration. [0004] A conventional battery state monitoring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCH01M2220/20Y02E60/12G01R31/3651H01M10/482H01M10/345H01M10/06Y02T10/7016H01M10/486G01R31/361G01R31/367G01R31/3828Y02E60/10
Inventor 尾藤诚二
Owner SUZUKI MOTOR CORP
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