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Power battery thermal management system and control method thereof

A thermal management system, power battery technology, applied in battery temperature control, secondary battery, power unit, etc., can solve the problem of lack of battery preheating or heat dissipation, to ensure thermal balance, prevent overcharge and overdischarge and the effects of overcharge and overdischarge

Active Publication Date: 2012-11-28
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal management system of the current power battery system is basically only for the heat dissipation treatment of the battery, and there is still a lack of the above-mentioned method for preheating or cooling the battery.

Method used

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  • Power battery thermal management system and control method thereof
  • Power battery thermal management system and control method thereof
  • Power battery thermal management system and control method thereof

Examples

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Embodiment Construction

[0021] Hereinafter, the present invention will be described with reference to the drawings and examples.

[0022] figure 1 It is a structural schematic diagram of an existing electric vehicle system. Such as figure 1 As shown, the existing electric vehicle system includes a vehicle charger 10 , a battery management system (BMS) 20 , a vehicle electric air conditioner 30 , relays 1 - 3 , a battery pack 50 and a fan 60 . Wherein, the vehicle charger 10 is connected to household 220V alternating current, and is used for charging the BMS 20 , the vehicle electric air conditioner 30 and the battery pack in the battery pack 50 . The relay 1 is a power switch of the vehicle electric air conditioner 30 and is used to control the power supply of the vehicle charger 10 to the vehicle electric air conditioner 30 . The relays 2 and 3 are power switches of the battery pack 50 and are used to control the power supply of the battery pack 50 by the vehicle charger 10 . The BMS 20 is used ...

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Abstract

The invention provides a power battery thermal management system which comprises a complete automobile power-driven air conditioner, a complete automobile charger, an air passage and a battery management system, wherein the air passage is connected with an air outlet of the complete automobile power-driven air conditioner and an air inlet of a battery pack and is used for leading hot air or cold air of the air conditioner into the battery pack; the battery management system is used for controlling the hot air of the air conditioner to be led into the battery pack so as to preheat the battery set in the battery pack when the lowest temperature of a battery module is lower than a first threshold value and controlling the battery set in the battery pack to be charged and discharged after preheating the battery pack; when the highest temperature of the battery module is higher than a second threshold value and the temperature difference between the ambient temperature of the air inlet of the battery pack and the temperature of the battery module is lower than a third threshold, the battery management system controls the cold air of the air conditioner to be led to the battery pack so as to dissipate heat in the battery set in the battery pack. Accordingly, the invention provides a control method of the thermal management system. The invention can lead the battery pack to be charged and discharged in the allowable temperature range and ensure the heat balance among the battery modules and prevent the battery from being overcharged and overdischarged.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a heat management system and a control method for a power battery of an electric vehicle. Background technique [0002] High power and fast charging and discharging are the current development direction of electric vehicle power batteries. In order to obtain higher power, it is necessary to connect several single battery modules in series to form a battery pack, and to generate high-voltage direct current through series connection. When the charge and discharge rate is higher, the temperature of the battery pack rises faster. [0003] Temperature has a double impact on power batteries. Specifically, as the temperature rises, the internal resistance of the battery decreases, thereby improving battery efficiency. However, higher temperatures will accelerate its chemical reactions, and in fact accelerate the harmful reaction rate, which is harmful to the battery. permanent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18B60K11/00H01M10/50H01M10/615H01M10/625H01M10/63
CPCY02E60/12Y02T10/7005Y02T10/70
Inventor 苏志高
Owner CHERY AUTOMOBILE CO LTD
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