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Method for increasing low-temperature discharge capacity by adjusting discharge cut-off voltage of battery

A technology of cut-off voltage and battery discharge, which is applied in the direction of secondary battery charging/discharging, secondary battery, secondary battery testing, etc., and can solve problems such as consuming warm-up time

Active Publication Date: 2016-07-06
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of battery preheating can fundamentally solve the problem of battery low-temperature use, it requires additional development of heating strategies and hardware, which consumes additional warm-up time; usually the method of battery preheating is more effective for low-temperature charging of batteries

Method used

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  • Method for increasing low-temperature discharge capacity by adjusting discharge cut-off voltage of battery
  • Method for increasing low-temperature discharge capacity by adjusting discharge cut-off voltage of battery
  • Method for increasing low-temperature discharge capacity by adjusting discharge cut-off voltage of battery

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] A method proposed by the present invention to increase the low-temperature discharge capacity by adjusting the battery discharge cut-off voltage, such as figure 1 As shown, it mainly includes the following steps:

[0020] 1) Calibrate the battery and measure the DC internal resistance of the battery at different temperatures (especially at low temperatures) at a lower state of charge (State of Charge, SOC);

[0021] 2) Obtain the discharge curve of the battery at different temperatures, different discharge rates, and different heat dissipation conditions, and obtain the voltage recovery point due to thermoelectric coupling when the battery is discharged at low temperature from the discharge curve;

[0022] 3) Obtain the current temperature value of the battery, and adjust the discharge cut-off voltage of the battery according to the discharge ...

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Abstract

The invention provides a method for increasing the low-temperature discharge capacity by adjusting a discharge cut-off voltage of a battery, and belongs to the technical field of batteries. The method comprises the following steps: calibrating the battery and measuring DC internal resistances of the battery at different temperatures in a relatively low charged state; obtaining discharge curves of the battery under the conditions of different temperatures, different rates and different heat dissipation conditions, and obtaining voltage recovery points generated by thermoelectric coupling actions from the discharge curves in a low-temperature discharge process of the battery; and obtaining the current temperature of the battery, and adjusting the discharge cut-off voltage of the battery according to the discharge rate of the battery, the internal resistances of the battery at different temperatures and the voltage recovery points of the discharge curves of the battery. According to the low-temperature discharge method provided by the invention, the battery can be relatively well used at a low temperature; and the battery discharges more energy.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a method for increasing low-temperature discharge capacity by adjusting the battery discharge cut-off voltage. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge rate, and no memory effect. Compared with lead-acid batteries and nickel-metal hydride batteries, they are more suitable for pure electric vehicles, plug-in electric vehicles and hybrid vehicles. It is also the main driving power of mobile phones and notebook computers and other main energy storage components. However, various internal impedances of lithium-ion batteries increase significantly at low temperatures. Even when a battery with a high state of charge is discharged at low temperature, according to the normal temperature discharge procedure, the amount of electricity that can be released is less, and the available electricity is r...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/42
CPCH01M10/4285H01M10/443H01M10/448Y02E60/10
Inventor 张剑波李哲葛昊张雅琨
Owner TSINGHUA UNIV
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