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Multi-string lithium battery set protective board

A lithium battery pack and protection board technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of uneven charging, poor charging effect, large voltage difference, etc., achieve long-term stable and reliable work, and improve charging effect, the effect of prolonging the service life

Inactive Publication Date: 2013-05-15
百顺松涛(天津)动力电池科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the protection circuit is mostly for the charging protection of a series of battery packs, and the voltage difference between the individual batteries is relatively large when fully charged, and the charging situation of each battery is uneven. Poor effect, which affects the life of the battery

Method used

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  • Multi-string lithium battery set protective board
  • Multi-string lithium battery set protective board
  • Multi-string lithium battery set protective board

Examples

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Embodiment Construction

[0013] A preferred embodiment of the present invention will be briefly described below by taking an n-series lithium battery pack as an example with reference to the accompanying drawings.

[0014] Such as figure 1 , 2 Shown:

[0015] A protection board for a multi-string lithium battery pack, comprising a voltage stabilizing circuit 1 and a comparison switch circuit 2 connected in series between the negative and positive charging nodes B1, B2 to Bn of each string of lithium battery packs of n strings of lithium battery packs, for comparison A charge-discharge switch 3 is connected between the switch circuit 2 and the ground terminal of the first lithium battery whose negative pole is grounded;

[0016] The voltage stabilizing circuit 1 includes voltage stabilizing tubes (Z1, Z2 to Zn) and current limiting resistors (RA1, RA2 to RAn) connected in series between the poles of each string of lithium battery packs of n strings; The discharge switch 3 is a MOS transistor M1, and...

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Abstract

The invention provides a multi-string lithium battery set protective board which comprises a voltage stabilizing circuit and a comparing switch circuit which are in parallel connection between a negative electrode charging node and a positive electrode charging node of each string of lithium battery set. A charge and discharge switch is connected between the comparing switch circuit and a ground connection end of a negative electrode grounded first lithium battery. The multi-string lithium battery set protective board has the advantages that the protective board is suitable for charge and discharge protection of a plurality of strings of the lithium battery sets, voltage difference among each single battery is smaller than a preset value (usually + / -20 mA) after the battery set is fully charged, even charge of each single battery of the battery set is achieved, charging effect in a parallel connection charging method is effectively improved, voltage of each single battery in the battery set is detected, service lift of each battery is prolonged and the product can work stably and reliably for a long time in an environment with the temperature between -20 DEG C to +60 DEG C.

Description

technical field [0001] The invention relates to the technical field of lithium battery charging protection, in particular to a protection board for a multi-string lithium battery pack. Background technique [0002] During the use of lithium-ion batteries, in order to avoid the incorrect use of the user and the continuous operation of the charger, the battery will heat up, the electrolyte in the battery will decompose and generate gas, which will cause the internal pressure to rise, and the release of metal lithium will cause harmful Risk of fire and rupture. Therefore, a protection circuit must be used in the lithium-ion battery circuit to protect the lithium-ion rechargeable battery. It must have an overcharge protection function to prevent the battery from deteriorating, igniting and bursting, and ensure the safety and reliability of the battery. [0003] In the prior art, the protection circuit is mostly for the charging protection of a series of battery packs, and the v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18
Inventor 高晶晶
Owner 百顺松涛(天津)动力电池科技发展有限公司
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