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Apparatus for judging state of assembled battery

A state judgment and battery pack technology, applied in the direction of battery circuit devices, circuit devices, battery pack components, etc.

Inactive Publication Date: 2005-01-26
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This problem is especially acute in systems where the current in the battery pack varies widely

Method used

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  • Apparatus for judging state of assembled battery
  • Apparatus for judging state of assembled battery
  • Apparatus for judging state of assembled battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] A preferred embodiment of the present invention is described below by way of example. figure 1 It is a schematic block diagram of the structure of a battery pack state determination device 20 as an example of the present invention, showing that the device is connected to a battery pack 10 whose power is consumed or regenerated by a load 12 . As shown in the figure, the battery pack state determination device 20 of this example includes a voltage measuring instrument 22 for detecting the voltages V1-Vn between the respective terminals of the battery blocks B1-Bn constituting the battery pack 10 at different times, a voltage measuring instrument 22 for detecting voltages flowing through the batteries An ammeter 26 for the currents I1-In in the group 10, a thermometer 28 for detecting the temperature T of the battery pack 10, a judgment based on the detection results of the voltage measuring instrument 22, the ammeter 26, the thermometer 28, etc. The abnormality of the bat...

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Abstract

For the measurement of the voltage of each block which constitutes a battery pack with different timings, a voltage (V) and current (I) every block the current of which is measured at the same timing as the voltage is measured are read (S100-S108) and an inner resistance (R) is derived from the temperature (T) of the assembled battery (S110, S112). A value of the difference (IN - IN+1) of two currents corresponding to two voltages of respective blocks of a plurality of battery blocks multiplied by the inner resistance (R) of the battery pack is added to the difference (VN - VN+1) of two voltages to calculate the voltage difference DELTA V (S116). When the maximum value DELTA Vmax of the calculated voltage difference DELTA V exceeds the threshold value Vref, the state is judged to be an overdischarge (S122, S124, S128).

Description

technical field [0001] The present invention relates to a device for judging the state of a battery pack, in particular to a device for judging the state of a battery pack formed by connecting a plurality of battery blocks in series. Background technique [0002] Generally, the following apparatus is suggested as a means for determining the state of such a battery pack. That is, a voltmeter connected to each of a plurality of battery blocks, wherein each battery block is composed of one or more single cells, and the plurality of battery blocks constitute a battery pack that supplies power to a load. A voltmeter is used to measure the voltage of each battery block simultaneously. Then, the apparatus determines the abnormality of the battery pack based on the voltages measured simultaneously. When the deviation of the two voltages among the voltages measured at the same time is equal to or greater than a predetermined value, the device confirms that a single cell is over-dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01N27/416H01M10/48H01M50/569H02J7/00
CPCY02E60/12H01M10/482H01M10/486Y02E60/10H01M50/569H01M10/48G01R31/3842H02J7/00306
Inventor 菊池义晃
Owner TOYOTA JIDOSHA KK
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