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Level Shift System for Multi-Cell Battery Packs

A transfer system and multi-battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as poor conversion accuracy, unbalanced battery cells, and incompetence for low-power applications, and achieve small offset Effect

Active Publication Date: 2020-02-21
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a level shift system suitable for multi-cell battery packs, which is used to solve the problem of large power consumption in the battery pack voltage detection circuit in the prior art. Not suitable for low-power applications, poor conversion accuracy, and the problem of providing various sampling currents from their corresponding positive terminals to aggravate the imbalance of cells in the battery pack

Method used

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  • Level Shift System for Multi-Cell Battery Packs
  • Level Shift System for Multi-Cell Battery Packs
  • Level Shift System for Multi-Cell Battery Packs

Examples

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Embodiment 1

[0091] see Figure 4, the present invention provides a level transfer system suitable for multi-cell battery packs, said level transfer system suitable for multi-cell battery packs includes: a battery pack 2, said battery pack 2 includes a first battery 21, a second Two batteries 22 and the highest battery 23, in this example, the battery pack 2 includes three batteries as an example, that is, the highest battery 23 is the third battery; the first battery 21, the second battery The two batteries 22 and the highest battery 23 are connected in series sequentially, and the positive pole of the first battery 21 is connected to the negative pole of the second battery 22, and the positive pole of the second battery 22 is connected to the negative pole of the second battery 22. The negative pole of the highest battery 23 is connected; the first battery level shift circuit 3, the first battery level shift circuit 3 is connected with the negative pole of the first battery 21 and the po...

Embodiment 2

[0121] see Figure 5 , this embodiment also provides a level transfer system applicable to multi-cell battery packs, the level transfer system applicable to multi-cell battery packs described in this embodiment is the one described in Embodiment 1 applicable to A system improved on the basis of the level transfer system of a battery pack, the level transfer system applicable to a multi-cell battery pack in Embodiment 1 includes a first battery 21, a second battery 22, a highest battery 23 (ie the third battery), the first battery level shift circuit 3, the second battery level shift circuit 4 and the highest battery level shift circuit 5 (ie the third battery level shift circuit) a total of three batteries , three level shift circuits; and the processing of the level shift system applicable to multi-cell battery packs in this embodiment includes the processing of the level shift system applicable to multi-cell battery packs described in Embodiment 1 In addition to the structu...

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Abstract

The invention provides a level transfer system suitable for a multi-battery pack. The system comprises a battery pack, a first battery level transfer circuit, a top battery level transfer circuit anda second battery level transfer circuit, wherein the battery pack comprises a first battery, a second battery and a top battery; the first battery, the second battery and the top battery are connectedin series; the first battery level transfer circuit is connected with the cathode of the first battery and the anode of the top battery; the top battery level transfer circuit is connected with the cathode of the first battery, the cathode of the top battery and the anode of the top battery; and the second battery level transfer circuit is connected with the first battery level transfer circuit,the top battery level transfer circuit, the cathode of the first battery and the anode of the top battery. The level transfer system suitable for the multi-battery pack can realize the voltage level transfer of multiple batteries and obtain high-precision level transfer signals, and does not draw current from the corresponding battery during sampling, so as to avoid accelerating battery imbalancebecause the sampling circuit draws current from the respective corresponding battery.

Description

technical field [0001] The invention belongs to the technical field of circuit design and relates to a level transfer system suitable for multi-cell battery packs. Background technique [0002] At present, there are two main methods for battery pack voltage detection: lithium battery pack voltage detection system based on level shift circuit and battery pack voltage detection system based on switch network: battery pack voltage detection system based on level transfer circuit such as figure 1 As shown, the system converts the voltage of each cell in the battery pack to the ground voltage through the level shift circuit, and then outputs the required battery cell voltage through the operational amplifier after passing through the data selector; the battery pack voltage detection based on the switch network system such as figure 2 As shown, the specified battery voltage in the battery pack is gated through the switch unit to output a differential voltage, and the differentia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/396
CPCG01R31/396
Inventor 罗丙寅尤勇刘亚彬
Owner CRM ICBG (WUXI) CO LTD
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