Passive balance failure protection circuit and battery pack

A failure protection and passive equalization technology, which is applied in charge equalization circuits, circuits, secondary batteries, etc., can solve problems such as over-discharge of single batteries, and achieve the effects of preventing failures, avoiding over-discharge, avoiding normal use and safe operation

Pending Publication Date: 2017-05-31
中凯智控科技(洛阳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a passive balance failure protection circuit to solve the problem of over-discharging of single cells when the control switch cannot be disconnected

Method used

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  • Passive balance failure protection circuit and battery pack
  • Passive balance failure protection circuit and battery pack
  • Passive balance failure protection circuit and battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] battery pack embodiment

[0023] Such as figure 2 As shown, the battery pack in this embodiment includes at least two single cells arranged in series, and a passive equalization fail-safe circuit is connected in parallel at both ends of each single cell. Since the single battery in the battery pack belongs to conventional technology, it will not be described in detail here, and the passive equalization failure protection circuit will be described in detail below.

[0024] figure 2 Take a passive equalization fail-safe circuit in which two single cells are connected in parallel as an example. Such as figure 2 As shown, in the passive equalization fail-safe protection circuit, the equalizing resistor R, the control switch S and the diode D are arranged in series. In general, in order to ensure the normal operation of the protection circuit, the position of the diode D can be adjusted arbitrarily, but the direction of the anode and the cathode cannot be changed, tha...

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PUM

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Abstract

The invention relates to a passive balance failure protection circuit and a battery pack. The battery pack comprises at least two single batteries; two ends of each single battery are connected with a passive balance failure protection circuit in parallel, and the protection circuit is provided with a control switch, a balance resistor and a device with pre-set conducting voltage drop in seires. When one control switch cannot be switched off, the corresponding balance resistor continuously consumes the electric energy of the corresponding single battery; however, the devices, which are arranged in seires, have certain conducting voltage drop, so that when the voltage of the corresponding single battery is lowered to the conducting voltage drop, the devices are not conducted any more and voltage of the corresponding single battery is not lower than a safety value; over-discharge of the corresponding single battery is avoided, and influences on normal utilization and safety operation of the corresponding single battery and the whole battery pack are avoided; more serious faults of a system are prevented.

Description

technical field [0001] The invention relates to a passive equalization failure protection circuit and a battery pack, belonging to the technical field of passive equalization of battery packs. Background technique [0002] The inconsistency of lithium batteries during use seriously affects the performance of charging and discharging lithium battery packs. Based on the industry, various BMS equalization solutions have been proposed. Due to the simple circuit, small size and low cost, the passive equalization scheme has a wide range of applications in solving the power balance of battery packs. [0003] The traditional passive equalization scheme is: a passive equalization line is connected in parallel at both ends of each single battery, and a control switch and equalization resistor are arranged in series on the passive equalization line, such as figure 1 as shown, figure 1 Take the passive equalization circuit of two single cells as an example. The control switch S is cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42
CPCH01M10/4207H02J7/0016Y02E60/10
Inventor 吕少锋张亮田云芳周长文孙君起
Owner 中凯智控科技(洛阳)有限公司
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