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Protective system for lithium ion battery

A lithium-ion battery and protection system technology, applied in battery circuit devices, emergency protection circuit devices, current collectors, etc., can solve the problems of maximizing electrochemical performance, inflexible protection parameter setting range, and failure to meet requirements, etc., to achieve expansion The effect of detection range

Inactive Publication Date: 2009-05-20
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection range of the above circuit is small, and the setting range of its protection parameters is not flexible enough to meet the requirements of lithium-ion battery packs made of various materials.
Therefore, the safety performance and electrochemical performance of the lithium-ion battery pack cannot be maximized.

Method used

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  • Protective system for lithium ion battery
  • Protective system for lithium ion battery

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Embodiment Construction

[0022] The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments.

[0023] The invention provides a lithium ion battery protection system, such as figure 1 , shown in Figure 2, including a signal acquisition unit and a control unit, the signal acquisition unit includes a protection chip, a voltage detection unit, and the control unit includes a single-chip microcomputer and a switch unit.

[0024] In the signal acquisition unit, the voltage detection unit is connected to the lithium-ion battery, and the protection chip detects the voltage of the battery through the voltage detection unit; the single-chip microcomputer reads the voltage value detected by the protection chip through the communication interface of the protection chip, and according to the voltage value The set range is controlled by the switch unit to disconnect or connect the charge and discharge circuit, that is, when the voltage value is outside...

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Abstract

The invention discloses a protective system for lithium ion cells. The system comprises a signal acquisition unit and a control unit, wherein the signal acquisition unit comprises a protective chip and a voltage detection unit, and the control unit comprises a singlechip and a switch unit. The voltage detection unit is connected with a lithium iron cell. The protective chip detects the voltage of the lithium ion cell through the voltage detection unit. The singlechip reads a voltage value detected by the protective chip through a communication interface of the protective chip and switches off and on a charging and discharging circuit through a control switch unit according to the set range of the voltage value. The system adopts a form of the protective chip and the singlechip to protect the lithium ion cell, enlarges a detection range through the protection chip, provides flexible protection parameter set through the singlechip, and is a protective system applicable to various lithium ion cells.

Description

【Technical field】 [0001] The invention relates to the technical field of batteries, in particular to a lithium ion battery protection system. 【Background technique】 [0002] Li-ion batteries have no memory effect and are therefore ideal for rechargeable batteries. High-capacity, high-safety lithium-ion battery packs have begun to be increasingly used in various hand-held electric appliances. This application field requires higher voltage and higher current, so most of them use the series application of multi-cell lithium batteries. [0003] However, when multiple lithium-ion batteries are used in series, since the performance indicators of each battery cannot be exactly the same, if the performance of a certain battery is affected, the performance of the entire battery pack will be greatly reduced, and may even cause lithium batteries to burn. , The serious consequences of the explosion. For example, once a certain battery is in an overcharged state, it may cause lithium ...

Claims

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Application Information

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IPC IPC(8): H02H7/18H02J7/00
Inventor 李春青
Owner SHENZHEN BAK BATTERY CO LTD
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