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Hybrid heating method, system and equipment for low-temperature direct-current discharge of lithium ion battery

A lithium-ion battery, DC discharge technology, applied in secondary batteries, circuits, measuring electricity, etc., can solve the problems of battery life impact and low energy utilization efficiency, achieve a wide range of application scenarios, and reduce the risk of damaging battery cycle life. Effect

Active Publication Date: 2021-07-27
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the pulse current heating method has higher energy utilization efficiency, but it requires complex external auxiliary circuits to realize pulse current heating.
The energy utilization efficiency of the DC heating method is low, and excessive current will have a certain impact on battery life

Method used

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  • Hybrid heating method, system and equipment for low-temperature direct-current discharge of lithium ion battery
  • Hybrid heating method, system and equipment for low-temperature direct-current discharge of lithium ion battery
  • Hybrid heating method, system and equipment for low-temperature direct-current discharge of lithium ion battery

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Embodiment Construction

[0053] The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, not to limit the invention. It should also be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings.

[0054] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0055] By comparing various heating methods, the present invention finds that the internal heating method has more advantages than the external heating method. The DC heating method and the pulse current heating method have wider application scenarios than the AC heating method. Fr...

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Abstract

The invention belongs to the field of low-temperature heating of lithium ion batteries, particularly relates to a hybrid heating method, system and equipment for low-temperature direct-current discharge of a lithium ion battery, and aims to solve the problems. The method comprises the following steps: performing cyclic heating aging tests of different discharge voltage amplitudes of the lithium ion battery under set conditions; fitting test data to obtain a lithium ion battery aging model; calculating an optimal discharge voltage amplitude based on the current environment temperature, the set cycle index and the set lithium ion battery capacity loss; carrying out constant-voltage discharge on the lithium ion battery at the optimal discharge voltage amplitude, and starting heating; if the temperature does not reach the preset temperature, repeatedly carrying out optimal discharge voltage amplitude calculation and constant-voltage discharge, and continuously carrying out heating; and if the preset temperature is reached, stopping constant-voltage discharging, and stopping heating. Direct current heating and liquid circulation heating are combined, the energy utilization efficiency of the battery is improved, the heating efficiency is high, the speed is high, the energy consumption is low, the temperature uniformity is good, and the risk of damaging the cycle life of the battery is reduced.

Description

technical field [0001] The invention belongs to the field of low-temperature heating of lithium-ion batteries, and in particular relates to a hybrid heating method, system and equipment for low-temperature DC discharge of lithium-ion batteries. Background technique [0002] Under the dual promotion of energy security and green transportation, electric vehicles have developed rapidly in recent years. Lithium-ion batteries have become the main power source of electric vehicles due to their high energy density, high power density, and long cycle life. However, due to the dependence of battery parameters on usage conditions, lithium-ion batteries still face some difficulties and challenges in practical applications. In a low temperature environment, the available capacity of lithium ions drops significantly, which directly affects the cruising range of electric vehicles. At the same time, the internal resistance of the battery increases sharply as the temperature decreases, ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/615H01M10/633H01M10/635H01M10/637H01M10/6571G01R31/367G01R31/382
CPCH01M10/615H01M10/635H01M10/633H01M10/637H01M10/6571G01R31/367G01R31/382Y02E60/10
Inventor 王军阮琳
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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