Heat management system for power batteries and control method

Abstract

The invention discloses a heat management system for power batteries. The heat management system comprises a battery box, a main oil inlet pipe, a main oil outlet pipe, a first oil outlet pipe, a temperature sensor and an external circulation system, wherein a main oil inlet tank is formed in the main oil inlet pipe; a main oil outlet tank is formed in the main oil outlet pipe; the width of the main oil outlet tank can be adjusted; a first oil outlet tank is formed in the first oil outlet pipe; the position of the first oil outlet tank can be adjusted back and forth oppositely to the length direction of the first oil outlet pipe; cooling liquid enters the battery box to exchange heat with a battery pack through the oil outlet tanks; and the widths of the oil outlet tanks and the position of the first oil outlet tank are adjusted according to the temperature value measured by the temperature sensor, so that the cooling liquid flows outside from the main oil outlet tank and the first oil outlet tank to increase the flow of the cooling liquid in a specific region. The invention further provides a heat management control method for the power batteries. According to the heat management control method, the condition that the battery pack works within an ideal temperature range can be ensured; and the condition that the temperature differences among various single batteries are within the ideal range can also be ensured.

Description

technical field [0001] The invention relates to the technical field of power battery heat exchange, in particular to a power battery heat management system and a control method thereof. Background technique [0002] Because new energy vehicles have the advantages of less environmental pollution and renewable energy, they have become one of the main directions for the development of the automobile industry. As one of the main forms of new energy vehicles, electric vehicles have attracted more and more attention. Different from traditional cars, electric cars use power batteries as their energy source. Therefore, the quality of power batteries is directly related to the performance of electric vehicles. According to the different reaction principles of power batteries, they can be divided into lead-acid batteries, nickel-metal hydride batteries, lithium-ion batteries, etc. No matter what kind of battery, it is required to work within a certain temperature range. Taking the...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect of unbalanced temperature between the battery cells in the prior art when the battery pack is heated or cooled, and to provide a power battery thermal management system and control method, which can ensure the temperature of the battery cells while cooling or heating. The balance of temperature between them improves the performance of the battery pack

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