Temperature control method of low-temperature lithium battery heating device

A temperature control method and low-temperature lithium battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor temperature control effect and energy saving effect, achieve good customer experience, prolong the service cycle life, prolong Effects on service life and safety

Pending Publication Date: 2021-06-08
LIAONING KAIXIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, we found in actual use that the temperature control effect and energy-saving effect of general heating and temperature control devices are not good. Therefore, we have developed a temperature control method for the heating device of low-temperature lithium batteries to achieve lower energy consumption. The purpose of normal use of the battery at low temperature

Method used

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  • Temperature control method of low-temperature lithium battery heating device
  • Temperature control method of low-temperature lithium battery heating device
  • Temperature control method of low-temperature lithium battery heating device

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0051] Specific embodiment 1: lithium iron phosphate battery

[0052] 1. When charging the battery

[0053] 1. When the battery is placed in the battery exchange cabinet, when the temperature of the battery core is > 0°C, there is no need to start the heating device;

[0054] 2. When the battery is placed in the battery exchange cabinet, when the temperature of the battery core is ≤0°C, the heating device needs to be started first, and when the temperature of the battery is >7±6°C, stop the heating.

[0055] 2. When the battery is discharged

[0056] 1. When the battery is static or discharged, the average temperature of the battery cell is ≤-5±5°C, and the remaining battery capacity is ≥35%, and the minimum voltage of the single string is >3250mv, the heating device is activated;

[0057] 2. When the battery is static or discharged, the average temperature of the battery cell is ≥7±6°C or the highest cell temperature is ≥15±5°C, or when the battery SOC is less than 30% or t...

specific Embodiment 2

[0058] Specific embodiment 2: Lithium manganate battery

[0059] 1. When charging the battery

[0060] 1. When the battery is placed in the battery exchange cabinet, when the temperature of the battery core is > 0°C, there is no need to start the heating device;

[0061] 2. When the battery is placed in the battery exchange cabinet, when the temperature of the battery core is ≤0°C, the heating device needs to be started first, and when the temperature of the battery is greater than 7±6°C, stop heating;

[0062] 2. When the battery is discharged

[0063] 1. When the battery is static or discharged, the average temperature of the battery cell is ≤-5±5°C, and the remaining battery capacity is ≥35%, and the minimum voltage of the single string is >3850mv, the heating device is activated;

[0064] 2. When the battery is static or discharged, the average temperature of the battery cell is ≥7±6°C or the highest cell temperature is ≥15±5°C, or when the battery SOC is less than 30% o...

specific Embodiment 3

[0065] Specific embodiment 3: ternary battery

[0066] 1. When charging the battery

[0067] 1. When the battery is placed in the battery exchange cabinet, when the temperature of the battery core is > 0°C, there is no need to start the heating device;

[0068] 2. When the battery is placed in the battery exchange cabinet, when the temperature of the battery core is ≤0°C, the heating device needs to be started first, and when the temperature of the battery is greater than 7±6°C, stop heating;

[0069] 2. When the battery is discharged

[0070] 1. When the battery is static or discharged, the average temperature of the battery cell is ≤-5±5°C, and the remaining battery capacity is ≥35%, and the minimum voltage of the single string is >3700mv, the heating device is activated;

[0071] 2. When the battery is static or discharged, the average temperature of the battery cell is ≥7±6°C or the highest cell temperature is ≥15±5°C, or when the battery SOC is less than 30% or the lowest...

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Abstract

The invention provides a temperature control method of a low-temperature lithium battery heating device, which comprises the following steps that different heating start and stop conditions are set when a battery is in different charging and discharging states, and when the battery is in the discharging state, the starting and stopping conditions of the heating device need to consider the temperature of a battery core, the residual capacity of the battery and the minimum voltage of a single string of batteries at the same time. The lithium ion separation and dendritic crystal caused by low-temperature charging are avoided, the safety of the battery is improved, when the battery is stored and standby, under the condition of minimum energy consumption, it is guaranteed that after a rider changes the battery, the discharging power of a battery pack is strong, the riding use experience is powerful, and meanwhile the service cycle life of the battery pack can be prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a temperature control method for a low-temperature lithium battery heating device. Background technique [0002] In order to improve the low-temperature performance of the battery, there is now a method of adding a heating device to the battery to heat the battery in a low-temperature environment. For example, the Chinese patent with the publication number CN 207852865 U discloses a low-temperature battery pack. A heating device is added, and the temperature sensor built into each battery is detected by the battery BMS to control the heating temperature. [0003] However, we found in actual use that the temperature control effect and energy-saving effect of general heating temperature control devices are not good. Therefore, we have developed a temperature control method for heating devices for low-temperature lithium batteries to achieve lower energy consumption. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/615H01M10/625H01M10/633
CPCH01M10/615H01M10/625H01M10/633Y02E60/10
Inventor 陈少华冯素萍潘成久刘天石王永峰
Owner LIAONING KAIXIN NEW ENERGY TECH
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