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Measuring circuit for voltage of single batteries of series lithium battery pack based on optocoupler relays

A technology of voltage measurement circuit and optocoupler relay, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of large temperature drift, small temperature drift, and large temperature drift of triode, and achieve simple circuit, stable performance, small size effect

Inactive Publication Date: 2015-05-27
上海航天智能装备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large temperature drift of the triode, this method has a large temperature drift.
Using the method of operational amplifier combined with P-type MOSFET tube, the temperature drift is small, but similar to the direct measurement method, it also requires a large number of operational amplifiers and MOSFET tubes, and due to the on-resistance of the MOSFET tube, there must be errors

Method used

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  • Measuring circuit for voltage of single batteries of series lithium battery pack based on optocoupler relays
  • Measuring circuit for voltage of single batteries of series lithium battery pack based on optocoupler relays
  • Measuring circuit for voltage of single batteries of series lithium battery pack based on optocoupler relays

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Embodiment

[0019] Such as Figure 1-3 As shown, a single cell voltage measurement circuit of a series lithium battery pack based on an optocoupler relay includes an optocoupler relay set 1, a decoder 2, an A / D sampling chip 3 and a measurement MCU4. The optocoupler relay group 1 is provided with a plurality of optocoupler relays, which are used to respectively obtain the voltage of each single battery in the series lithium battery pack, and the analog signal input terminal of the A / D sampling chip 3 passes through the normally open switch in the optocoupler relay Connect the single cell 5 of the lithium battery pack connected in series, and the digital signal output terminal of the A / D sampling chip 3 is connected to the measurement MCU4, and the measurement MCU4 is connected to the control terminal of each optocoupler relay through the decoder 2 for controlling its normal The closure of the open switch, thereby performing gating.

[0020] Its working principle is: according to the high...

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Abstract

The invention relates to a measuring circuit for voltage of single batteries of a series lithium battery pack based on optocoupler relays. The circuit comprises an optocoupler relay set, a decoder, an A / D (Analog to Digital) sampling chip and a measuring MCU (Microprogrammed Control Unit), wherein the optocoupler relays are arranged in the optocoupler relay set; an analog signal input end of the A / D sampling chip is connected with the single batteries of the series lithium battery pack via the optocoupler relays; a digital signal output end of the A / D sampling chip is connected with the measuring MCU; and the measuring MCU is connected with control ends of the optocoupler relays via the decoder. Compared with the prior art, the circuit has the advantages that the circuit is low in noise, small in size, simple in structure, stable in performance, and simple.

Description

technical field [0001] The invention relates to a voltage measurement circuit, in particular to a voltage measurement circuit for a single cell of a series lithium battery pack based on an optocoupler relay. Background technique [0002] At present, there are many methods for measuring the voltage of series battery packs on the market, such as resistance voltage divider method, floating ground method and so on. The actual voltage is attenuated to the acceptable voltage range of the measurement chip through resistor division, and the read conversion voltage is calculated by subtraction and multiplied by the attenuation factor to obtain the measured value. This scheme is convenient for measurement and low in cost, but there are errors that cannot be eliminated. As the number of battery cells increases, the voltage measurement error of the single battery will increase with the increase of the common-mode voltage. The battery terminal voltage is measured using floating ground ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01R19/25
Inventor 张志虎赵宜鹏
Owner 上海航天智能装备有限公司
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