Level transfer system suitable for multi-battery pack

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...

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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

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