Battery voltage detecting device in serially-connected battery pack and method of battery voltage detecting device

A technology for battery voltage detection and series connection of battery packs is applied in measuring devices, measuring electricity, measuring electrical variables and other directions, which can solve problems such as large voltage error, increase product cost, and increase product realization difficulty.

Inactive Publication Date: 2011-08-24
NINGBO FEI CHIDA ELECTRONICS TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this scheme, the higher the voltage is, the larger the resistance divider ratio is, and the greater the voltage error is at the same time.
Therefore, in the high-vol

Method used

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  • Battery voltage detecting device in serially-connected battery pack and method of battery voltage detecting device
  • Battery voltage detecting device in serially-connected battery pack and method of battery voltage detecting device
  • Battery voltage detecting device in serially-connected battery pack and method of battery voltage detecting device

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Embodiment Construction

[0022] see figure 1 , the series battery pack includes 5 batteries connected in series, and these 5 batteries are sequentially indicated as CELL1 to CELL5 in the drawings. The battery is preferably a lithium battery, and the charged voltage of a single battery is 4.2 volts (V), so the battery pack in series provides a total voltage of 21V. Of course, the five lithium batteries used in this embodiment should not be considered limiting, and any number, type, or capacity of batteries may be used with the present invention. Those skilled in the art realize that each battery may actually be several physical batteries connected in parallel and operating at the same voltage to increase the overall capacity of the battery pack in series.

[0023] The switch module includes 5 first electronic switches denoted as SW1 to SW5 in sequence and 5 second electronic switches denoted as SK0 to SK4 in sequence, and the anode of each battery is connected to the first bus through one of the first...

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Abstract

The invention relates to a battery voltage detecting device in serially-connected battery pack and a method of the battery voltage detecting device. The device comprises a switch module for selectively connecting a positive pole and a negative pole of any one battery with a first bus and a second bus respectively, a voltage-to-current (V-I) conversion module of which the output end current is in a linear relation with the voltage between the first bus and the second bus, a current-to-voltage (I-V) conversion module for converting a current signal at the output end of the V-I conversion module into a voltage signal in linear relation, an analogue to digital (A/D) converter for acquiring the voltage signal and converting the voltage signal into a digital signal, and a controller for controlling the switch module and processing and displaying the information received from the A/D converter. The circuit of the invention is simple; the implementation cost is reduced, and the detection precision is improved.

Description

technical field [0001] The invention relates to voltage detection technology, in particular to a battery voltage detection device and method in series battery packs, which are used in series connection in the fields of pure electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, electric ships, and backup communication power supplies. Voltage detection of individual cells in a battery pack. Background technique [0002] Back-up communication batteries, electric vehicles and hybrid electric vehicles, etc. are often powered by multiple batteries, which are usually connected in series to provide higher voltage. Due to the differences between individual batteries and the limitation of the working voltage platform of the battery, this series of batteries requires battery balancing and battery safety protection to prevent premature failure of the battery and avoid safety problems. Therefore, the system needs to be able to accurately detect the voltage of each ce...

Claims

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Application Information

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IPC IPC(8): G01R31/36G01R19/25
Inventor 童文贤
Owner NINGBO FEI CHIDA ELECTRONICS TECH DEV
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