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Battery status monitoring circuit and battery device

A technology for monitoring circuit and battery status, applied in the field of battery status monitoring circuit, can solve the problems of limited charging method of chargers, difficult to calculate the internal resistance of secondary battery, etc., and achieve the effect of high-precision remaining power prediction

Inactive Publication Date: 2019-03-12
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the conventional technology, there is a problem that the charging current must be changed at a predetermined cycle during charging, and each voltage must be measured, and the charger and the charging method are limited.
In addition, there is a problem that it is difficult to calculate the internal resistance of the secondary battery when the current or voltage fluctuates when the secondary battery is used.
In addition, there is a problem that the life diagnosis of the secondary battery must be performed by calculating the approximate formula.

Method used

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  • Battery status monitoring circuit and battery device
  • Battery status monitoring circuit and battery device
  • Battery status monitoring circuit and battery device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0026] figure 1 It is a block diagram of a battery device including the battery state monitoring circuit of the first embodiment. The battery device having the battery state monitoring circuit of the first embodiment includes a battery state monitoring circuit 11 , a secondary battery 101 , a capacitor 112 , and external terminals 131 and 132 connected to a charger or a load.

[0027] The secondary battery 101 has a positive terminal 106 and a negative terminal 107 . The secondary battery 101 can be represented as an equivalent circuit using a battery capacitance 102 , a resistance 103 , a resistance 104 , and a capacitance 105 .

[0028] The battery state monitoring circuit 11 includes a VDD terminal 116 , a VSS terminal 117 , a capacitor connection terminal 127 , an external connection terminal 128 , and an output terminal 129 .

[0029] The negative terminal 107 of the secondary battery 101 is connected to the VSS terminal 117 of the battery state monitoring circuit 11 ,...

no. 2 approach

[0051] image 3 It is a block diagram of a battery device including the battery state monitoring circuit of the second embodiment. Differences from the battery state monitoring circuit of the first embodiment will be described below.

[0052] The battery state monitoring circuit 111 further includes a constant current circuit 123 and a constant current circuit 124 . The arithmetic circuit 120 further includes a second output terminal and a third output terminal.

[0053] The constant current circuit 123 is connected between the VDD terminal 116 and the capacitor connection terminal 127, and the second output terminal of the arithmetic circuit 120 is connected to the control terminal. The constant current circuit 124 is connected between the capacitor connection terminal 127 and the VSS terminal 117, and the third output terminal of the arithmetic circuit 120 is connected to the control terminal.

[0054] Next, the operation of the battery state monitoring circuit of the sec...

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PUM

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Abstract

The present invention provides a battery state monitoring circuit and a battery device capable of predicting the remaining power of a secondary battery with high precision. The battery state monitoring circuit includes a simulated equivalent circuit of the secondary battery, and can measure the open circuit voltage of the secondary battery in a simulated manner by passing the current flowing through the detection resistor through the simulated equivalent circuit of the secondary battery.

Description

technical field [0001] The present invention relates to a battery state monitoring circuit and a battery device for detecting voltage and abnormality of a secondary battery, and more particularly to a battery state monitoring circuit and a battery device equipped with a secondary battery remaining power prediction function and a deterioration diagnosis function. Background technique [0002] Figure 5 A schematic diagram of a battery device including a conventional battery state monitoring circuit is shown. A battery device including a conventional battery state monitoring circuit includes a secondary battery 501 , a current source 511 , a current source 512 , and a switch circuit 510 . The secondary battery 501 can be represented as an equivalent circuit using a battery capacitance 502 , a resistance 503 , a resistance 504 , and a capacitance 505 . The switch circuit 510 operates to switch between the current source 511 and the current source 512 . The current source 511 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/3842
CPCH01M10/44G01R31/3842G01R31/392G01R31/3648G01R31/2848H01M10/48G01R31/389Y02E60/10G01R31/382
Inventor 小池智幸佐野和亮樱井敦司向中野浩志
Owner SII SEMICONDUCTOR CORP