Voltage detection circuit for multiple lithium batteries

A voltage detection circuit, lithium battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of large circuit scale, high cost, voltage error, etc., and achieve reduced chip area, simple sampling, and simple circuit. Effect

Pending Publication Date: 2021-01-01
SUZHOU KAIWEITE SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The above-mentioned common lithium battery voltage detection method has a large circuit scale, high cost, and complicated calculations. In the process of voltage processing, voltage errors will be introduced, and the accuracy is poor.

Method used

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  • Voltage detection circuit for multiple lithium batteries
  • Voltage detection circuit for multiple lithium batteries
  • Voltage detection circuit for multiple lithium batteries

Examples

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Embodiment 1

[0019] Example 1: see figure 1 , a multi-cell lithium battery voltage detection circuit, the detection circuit includes a high-precision comparator, two sets of pressure capacitors, a control switch and a lithium battery pack, and the lithium battery pack is composed of m (m≥2) lithium batteries connected in series The lithium battery pack is connected to the positive input terminal of the high-precision comparator through a group of voltage capacitors, and the high-precision basic voltage of the circuit content is connected to the negative input terminal of the high-precision comparator through another group of voltage capacitors. In the lithium battery pack, each lithium battery is connected in series with a control switch.

[0020] The circuit diagram of the patent of the present invention is as follows figure 2 As shown, this article takes 4 lithium batteries in series as an example, and it can also be extended to other numbers of lithium batteries in series. In the fig...

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Abstract

The invention relates to a voltage detection circuit for multiple lithium batteries. The voltage detection circuit comprises a high-precision comparator, two groups of voltage-dividing capacitors, a control switch and a lithium battery pack, and is characterized in that the lithium battery pack is formed by connecting m (m is greater than or equal to 2) lithium batteries in series, and the lithiumbattery pack is connected with the positive input end of the high-precision comparator through one group of voltage-dividing capacitors; and the high-precision basic voltage of the circuit is connected with the inverting input end of the high-precision comparator through the other group of voltage-dividing capacitors.

Description

technical field [0001] The invention relates to a detection circuit, in particular to a multi-cell lithium battery voltage detection circuit, which belongs to the technical field of voltage detection. Background technique [0002] At present, more and more devices are powered by lithium batteries. Compared with plug-in devices, devices powered by lithium batteries greatly improve the portability of the devices. However, lithium batteries need to be charged and discharged within a certain voltage range. If the charging voltage is too high or the discharging voltage is too low, it will cause danger. Therefore, it is very important to accurately detect and protect the charging and discharging voltage of lithium batteries. For a single-cell lithium battery, we can directly sample the battery voltage and compare it with a certain reference voltage. If the battery voltage is greater than or equal to a certain reference voltage, we think that the lithium battery is in an overcharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/396G01R31/385
CPCG01R31/385G01R31/396
Inventor 张胜涂才根谭在超丁国华罗寅
Owner SUZHOU KAIWEITE SEMICON
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