System and method for partitioned heat management based on lithium ion battery pack

Abstract

The invention discloses a system for partitioned heat management based on a lithium ion battery pack. The system comprises a box body and a battery pack, wherein the battery pack is arranged in the box body and consists of a plurality of single square lithium ion batteries which are vertically arranged in parallel; a liquid inlet pipe with a flat pipe cross section is arranged at the outer side of a positive electrode lug of each single square lithium ion battery above the battery pack; a liquid outlet pipe with a flat pipe cross section is arranged at the outer side of a negative electrode lug of each single square lithium ion battery above the battery pack. The system has the advantages that the structure is simple, and the cost is low; by adopting a partitioned heat management method, a phase change material and liquid cooling are combined, the active and passive types are combined, the heat radiation, heating and heat insulation functions are realized, the accurate control on temperature in the square lithium ion battery pack is realized, the better heat radiation effect is realized, and the heat safety of the battery pack is guaranteed; the safety of the battery is effectively improved, and the service life of the battery is prolonged; the long-time efficient running of the battery heat management system is guaranteed, and the economy of the heat management system is improved.

Description

[0001] Technical field: [0002] The invention relates to a system and method based on regional thermal management of lithium-ion battery components. [0003] Background technique: [0004] As an important part of new energy vehicles, power batteries have strict requirements on the working environment. Studies have shown that temperature has an important impact on the performance and life of lithium-ion batteries. Due to the limitation of its own chemical reaction, when the ambient temperature is lower than 0°C, the internal resistance of the lithium-ion battery is too large, the discharge power is low and it cannot be charged normally; the lithium-ion battery generates a lot of heat during charging and discharging, and the square lithium-ion When the battery is charged and discharged at a low rate, the heat generation of each part is relatively balanced. When the high rate is charged and discharged quickly, the heat generation rate is greater in the area close to the battery ...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a system and method based on regional thermal management of lithium-ion battery components, which has a simple structure and low cost. The management method combines phase change materials and liquid cooling, active and passive, and has the functions of heat dissipation, heating and heat preservation at the same time, and realizes precise control of the temperature in the square lithium-ion battery pack, which can effectively improve battery safety and extend battery life. The service life solves the problem of limited cooling effect and high energy consumption when using the same cooling method without considering the difference in heat production in different areas of the single lithium-ion battery in the prior art

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