Three-pack power battery cooling and heating system of new energy automobile

Abstract

The invention discloses a three-pack power battery cooling and heating system of a new energy automobile. A first battery pack and a second battery pack are arranged at the lower part of a chassis ofa vehicle body and are located at the lowest positions of the vehicle. A third battery pack is arranged in a trunk of the vehicle and is located at the highest position of the vehicle. A water coolingstructure in the third battery pack is provided with a normally closed exhaust valve at the highest position of the vehicle. A scale line at the lowest liquid position of an expansion water tank is lower than the normally closed exhaust valve. The water cooling structure composed of water cooling plates connected in parallel is arranged in each one of the battery packs. The water cooling structures connected in parallel in each battery pack are connected to a high-pressure water heater, a plate heat exchanger, the expansion water tank and an electronic water pump in a front cabin to form a loop. A damping hole is arranged in a joint of the water cooling plate. A thermal conductive pad and a thermal insulation pad are respectively arranged above and below the water cooling plate. A proportional control water valve is arranged at a main inlet of the third battery pack. According to the cell temperature difference control water valve opening degree, uniform temperatures between cells arerealized, the driving range of the whole vehicle is increased and the exhaust problem of the system is solved.

Description

technical field [0001] The patent of the invention belongs to the technical field of new energy vehicles, and in particular relates to a cooling and heating system for a three-pack power battery of a new energy vehicle. Background technique [0002] Power battery is one of the core components of new energy electric vehicles powered by electricity, and is the power source of the whole vehicle. When the entire battery pack is charged and discharged, its working efficiency, service life and safety performance are all affected by temperature. It is necessary to control the temperature reasonably, control the upper and lower limits of the temperature of the battery cell, and control the temperature difference between the battery pack and the battery cell. If any value exceeds a reasonable range, it will affect the working efficiency and service life of the entire battery pack, or cause the battery pack to malfunction, or even cause safety issues. [0003] At present, the liquid-...

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Problems solved by technology

Problem: This solution consists of 18650 cells to form a battery module, and then the battery module to form a battery module. Due to space constraints, the first battery pack includes 3 battery modules, the second battery pack includes 6 battery modules, and the second battery pack includes 6 battery modules. The three-battery pack includes 4 battery modules, and the number of battery modules contained in each battery module is also inconsistent, that is, the calorific value of each battery module is different, resulting in inconsistent cooling liquid flow required by different battery modules, and flow distribution Difficult, it is difficult to ensure the temperature uniformity of the battery cells; in a cold or hot environment, considering factors such as sunlight radiation, heating or air conditioning in the passenger compartment, the ambient temperature inside the trunk and the battery pack under the chassis of the vehicle body are inconsistent, resulting in The heating / cooling rates of the cells in different battery packs are inconsistent, and it is difficult to ensure the temperature uniformity among the cells; at the same time, the cooling and heating system of the three packs of power batteries is in a "U" shape, and the highest point of the internal water cooling system of the third battery pack is higher than that of the previous one. The minimum liquid level scale line of the expansion tank in the engine room is 155mm, and the general design principle of the cooling system is that the minimum liquid level scale line of the expansion tank is the highest point of the entire cooling system, so it does not meet the general design principles of the cooling system, resulting in poor exhaust inside the cooling system

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