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Battery capacity detection circuit

A technology for detecting circuit and battery capacity, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of high cost, poor accuracy, complex equipment, etc., and achieve the effect of simple structure

Active Publication Date: 2022-01-07
保力新(内蒙古)电池有限公司
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  • Abstract
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Problems solved by technology

However, the existing battery capacity detection methods have low detection accuracy, poor accuracy, complex equipment and high cost

Method used

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  • Battery capacity detection circuit

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specif...

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Abstract

A battery capacity detection circuit includes a single-chip microcomputer, a digital-to-analog conversion unit and a voltage conversion unit. The single chip microcomputer senses the voltage of the battery every preset time, and adjusts the duty cycle of the output pulse width modulation signal according to the sensed voltage of the battery. The single-chip microcomputer also calculates the discharge current of the battery within the preset time according to the duty ratio of the pulse width modulation signal, and calculates the discharge capacity of the battery within the preset time according to the discharge current . The single-chip microcomputer also compares the discharge current with a reference value. When the discharge current is less than the reference value, the output pin stops outputting the pulse width modulation signal. The discharge electric quantity within each preset time is summed to obtain the capacity of the battery. The above battery capacity detection circuit has accurate detection, simple structure and low cost.

Description

【Technical field】 [0001] The invention relates to the technical field of electric vehicles, in particular to a battery capacity detection circuit applied to electric vehicles. 【Background technique】 [0002] With the gradual enhancement of people's awareness of environmental protection and the country's vigorous promotion of new energy, the development of electric vehicles is becoming more and more rapid. As the power source of electric vehicles, the safety of charging and discharging batteries is directly related to the safety of electric vehicles. If the capacity of the battery cells in the battery pack is not the same, it is very easy to overcharge during the charging and discharging process. Once overcharging occurs, it will cause the battery to self-discharge and affect the service life of the battery; if it is serious, it will cause the temperature of the battery to rise, causing combustion or even explosion. Therefore, before assembling the battery cells into a batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/3842G01R31/396
CPCG01R31/3842G01R31/396
Inventor 汪永祥李瑶
Owner 保力新(内蒙古)电池有限公司
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