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A low-temperature charging and discharging method for batteries based on temperature compensation

A temperature compensation, battery technology, applied in secondary battery charging/discharging, lead-acid batteries, secondary batteries, etc., can solve problems such as shortening the service life, and achieve the effect of increasing utilization, making up for capacity loss, and accelerating chemical reactions

Active Publication Date: 2022-02-15
ZHEJIANG TIANNENG BATTERY JIANGSU +3
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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 low-temperature charging and discharging method for storage batteries based on temperature compensation, which overcomes the defects in the prior art, effectively solves the problems raised in the background technology, and avoids the problem of shortened service life caused by insufficient charging of storage batteries under low temperature conditions

Method used

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  • A low-temperature charging and discharging method for batteries based on temperature compensation
  • A low-temperature charging and discharging method for batteries based on temperature compensation

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Taking a 12V 20AH battery pack as an example (here is a conventional 6-cell rated voltage 12V battery), the following steps are included:

[0060] 1) Module heating: the ambient temperature is -15°C, the controller 22 receives the charging signal, and activates the temperature compensation device according to the detected ambient temperature, so that the resistance grid 1 is heated and the temperature rises by 35°C.

[0061] 2) Pre-charge judgment: the charging current is 2A=0.1CA*20AH, and the voltage of the battery pack can reach 2V*6=12V, then the battery pack has no faults and enters the segmented charging stage.

[0062] 3) Segmented charging:

[0063] The first stage: large current constant current charging stage, charging current 4.8A=0.24CA*20AH, constant current charging to battery voltage 14.4V=2.4V*6, or charging time reaches 2H, the program transfers to the second stage;

[0064] The second stage: large and medium current constant current charging stage, ch...

Embodiment 2

[0072] Take the 12V100AH ​​battery pack as an example (here is a 12V battery with a rated voltage of 6 conventional cells), including the following steps:

[0073] 1) Module heating: the ambient temperature is -33°C, the controller 2 receives the charging signal, and activates the temperature compensation device according to the detected ambient temperature, so that the resistance grid 1 is heated, and the temperature rises by 56°C.

[0074] 2) Pre-charge judgment: the charging current is 10A=0.1CA*100AH, and the voltage of the battery pack can reach 2V*6=12V, then the battery pack has no faults and enters the segmented charging stage.

[0075] 3) Segmented charging:

[0076] The first stage: large current constant current charging stage, charging current 24A=0.24CA*100AH, constant current charging to battery voltage 14.4V=2.4V*6, or charging time reaches 3H, the program transfers to the second stage;

[0077] The second stage: large and medium current constant current chargi...

Embodiment 3

[0085] Take the 48V100AH ​​battery pack as an example (here are four conventional 12V batteries with 6 cells of rated voltage), including the following steps:

[0086] 1) Module heating: the ambient temperature is -45°C, the controller 2 receives the charging signal, and activates the temperature compensation device according to the detected ambient temperature, so that the resistance grid 1 is heated, and the temperature rises by 62°C.

[0087] 2) Pre-charge judgment: the charging current is 10A=0.1CA*100AH, and the voltage of the battery pack can reach 2V*24=48V, then the battery pack has no faults and enters the segmented charging stage.

[0088] 3) Segmented charging:

[0089] The first stage: large current constant current charging stage, charging current 24A=0.24CA*100AH, constant current charging to battery voltage 57.6V=2.4V*24, or charging time reaches 3H, the program transfers to the second stage;

[0090] The second stage: large and medium current constant current ...

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Abstract

A method for charging and discharging batteries at low temperature based on temperature compensation, comprising the following steps: 1) when the ambient temperature is lower than -10°C during battery charging and discharging, the temperature compensation device is activated to raise the temperature; 2) a small current 0.05-0.1C pre-charge determination , charging reaches 0.3-0.4H, if the cell voltage of the battery does not reach 2V, the charger will alarm and display abnormality, and the charging will end; 3) Segmented charging: the first stage: constant current 0.21-0.24C to cell voltage 2.4V ;Second stage: constant current 0.1‑0.2C to battery cell voltage 2.45V; third stage: current limit 0.01‑0.05C, battery cell voltage constant voltage 2.48V, current lower than 0.01A; fourth stage: constant Current 0.07‑0.08C to battery cell voltage 2.5V, charging up to 0.5H; fifth stage: battery cell voltage limit 2.29‑2.3V, current limit 0.005‑0.02C long-term float charge. This method can avoid the problem of shortened service life caused by insufficient charging of the storage battery at low temperature.

Description

technical field [0001] The invention belongs to the field of accumulators, in particular to a method for charging and discharging an accumulator at low temperature based on temperature compensation. Background technique [0002] A battery is a device that directly converts chemical energy into electrical energy. It is a rechargeable battery designed to be recharged through a reversible chemical reaction. It usually refers to a lead-acid battery, which is a type of battery and belongs to the secondary battery. Battery. Due to the high cost performance of batteries, good power characteristics and affordable prices, they have been widely used in electric vehicles in recent years, and electric vehicles are popular among consumers in the domestic market due to their advantages of lightness, convenience and low price. According to the survey, Electric vehicles using storage batteries have a high sales volume in the northern market, are widely used, and have a large audience. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/615H01M10/635H01M10/6571H01M10/06
CPCH01M10/44H01M10/443H01M10/446H01M10/615H01M10/635H01M10/6571H01M10/06Y02E60/10
Inventor 李军陈战营孙磊胡国柱
Owner ZHEJIANG TIANNENG BATTERY JIANGSU
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