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Protection control method of low-capacity high-power lithium battery pack

A lithium battery pack, protection and control technology, applied to battery circuit devices, emergency protection circuit devices, collectors, etc., can solve problems such as inability to guarantee consistency and tediousness

Inactive Publication Date: 2012-04-11
江苏海四达电源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with hardware protection: any parameter adjustment needs to change the device, which is cumbersome; the consistency of mass production cannot be guaranteed (for example, +130% ~ -70% delay error)

Method used

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  • Protection control method of low-capacity high-power lithium battery pack
  • Protection control method of low-capacity high-power lithium battery pack
  • Protection control method of low-capacity high-power lithium battery pack

Examples

Experimental program
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Embodiment Construction

[0025] The block diagram of the dynamic equalization circuit is as follows: figure 1 Shown: The system uses a microprocessor as the core of the control circuit. By sampling the voltage of each single battery, it judges its changing state, controls the state of each shunt circuit, and realizes dynamic balance.

[0026] The control method is completed by software, which realizes the flexibility of use. According to different single batteries and different use environments, optimize the balance control.

[0027] This system uses FreeScale's microprocessor MC9S08 as the core control element to complete voltage collection, calculation, control output and other functions. It has the characteristics of precise control and easy expansion. The chip has 10 channels 10bitA / D, 8KB Flash, and 28 IOs, which meet the system design requirements. Chip block diagram as figure 2 .

[0028] Since the control system is always connected to the battery pack system, low power consumption must be...

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PUM

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Abstract

The invention discloses a protection control method of a low-capacity high-power lithium battery pack. A system carries out real-time monitoring on parameters of a battery module, wherein the parameters include a voltage, a current and a temperature and the like; monitoring and coordination are carried out on all single batteries in the battery pack; automatic determination is carried out on a battery state; a controller is used to control each equalization unit to carry out protection and dynamic equalization management on a battery or a set of batteries; and circuit working starting time can cover a whole charging or discharging period of the battery pack. According to the invention, the system employs a microprocessor as a control core, so that functions of collection, calculation and control output of data are realized; therefore, the method has advantages of accurate control and simple expansion and the like.

Description

【Technical field】 [0001] The invention relates to a protection and control method for a power type lithium-ion battery pack, which can be used as protection and equalization for small-capacity, high-power lithium-ion battery pack applications such as electric tools. 【Background technique】 [0002] In order to meet the voltage and power requirements of electric tools, lithium-ion battery packs for electric tools are usually composed of multiple single cells connected in series. In most cases, due to the deviation of the electrochemical characteristics of the lithium ion itself, the imperfect process control and detection methods, and the inconsistency of the working conditions, there must be differences between the individual batteries, resulting in the state of charge of each individual battery ( SOC) and capacity / energy (C / E) mismatch, affecting the capacity of the entire battery pack. When discharging, the battery with low SOC or C / E reaches the low-voltage protection thr...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02H7/18
Inventor 沈晓彦黄钟琪茅海忠
Owner 江苏海四达电源有限公司
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