CN205039220U - A kind of automobile power battery cooling system - Google Patents

Abstract

The utility model discloses an automobile power battery cooling system, including power battery and heat pump system, heat pump system includes compressor, condenser, expansion valve and evaporimeter, and compressor, condenser, expansion valve and evaporimeter loop through the pipeline and connect gradually and form the refrigeration return circuit, pack the refrigeration working medium in the refrigeration return circuit, are equipped with on the evaporimeter and place the district, and power battery is attached on placing the district. When the refrigerating system works, a refrigerating working medium passes through the compressor and the condenser, then passes through the expansion valve to become low-temperature and low-pressure liquid, flows into the evaporator, is tightly attached to the power battery, and a refrigerant is absorbed, heated and evaporated in the evaporator to become gas, flows back to the compressor and then enters the next cycle. The air conditioner refrigerant is directly used for heat exchange, the heat exchange efficiency is high, the air conditioner refrigerant is not influenced by the external environment, and the air conditioner refrigerant can be continuously used even in hot summer, so that the charging and discharging efficiency of the battery is improved, the cruising ability and the service life are improved, and the safety is ensured in a temperature range suitable for the working of the battery.

Description

A kind of automobile power battery cooling system

technical field

The utility model is used in the technical field of power battery cooling, in particular to an automobile power battery cooling system.

Background technique

Power battery is one of the core components of electric vehicles and the power source of the whole vehicle. The power battery is generally packaged in a closed battery box. When the battery is charging and discharging, due to the internal resistance, the battery will generate heat. If this part of the heat is not dissipated in time, it will continue to accumulate. When it reaches a certain temperature value, it will seriously It affects the charging and discharging efficiency and service life of the battery, and even causes the battery to explode spontaneously, seriously affecting the safety of the whole vehicle. Therefore, a reasonable battery thermal management system must be designed to ensure that it works within a reasonable temperature range.

At present, most power batteries use air-cooled structure or water-cooled method. The disadvantages of the above cooling scheme are: 1. The cooling air temperature cannot be controlled, the air-cooled heat exchange efficiency is low, and it is greatly affected by the external environment temperature. Especially in summer, when the external temperature is high, the air-conditioning cold air can only be introduced from the passenger compartment. Refrigeration—cold air—cooling the battery, large energy loss and poor heat transfer efficiency; 2. The water temperature cannot be controlled, and the heat transfer efficiency is low, which is limited by the external environment temperature. At present, the battery water cooling scheme generally involves heat exchange between the battery and water, and then the hot water dissipates heat into the air through the radiator. This structure requires that the temperature of the cooling air must be lower than the water temperature, so in summer when the external temperature is high, the Seriously affect its heat transfer efficiency.

Utility model content

In order to solve the above problems, the utility model provides an automotive power battery cooling system. Through a special structural design, the power battery can directly exchange heat with the air-conditioning refrigerant. The heat exchange efficiency is high, and the battery temperature can be precisely controlled to ensure that the battery Work efficiency, improve system security.

The technical solution adopted by the utility model to solve the technical problem is: a cooling system for a power battery of an automobile, comprising a power battery and a heat pump system, the heat pump system comprising a compressor, a condenser, an expansion valve and an evaporator, and the compressor The condenser, expansion valve and evaporator are sequentially connected through pipelines to form a refrigeration circuit, the refrigeration circuit is filled with refrigerant, the evaporator is provided with a placement area, and the power battery is attached to the placement area.

As a further improvement of the technical solution of the utility model, the evaporator includes a liquid separation tank, a liquid collection tank, and an evaporation tube connecting the liquid separation tank and the liquid collection tank, and the evaporator forms a placement area outside the evaporation tube, and the A working fluid inlet is provided on the liquid separation tank, a working fluid outlet is provided on the liquid collection tank, and the evaporator is connected to the refrigeration circuit through the working fluid inlet and the working fluid outlet.

As a further improvement of the technical solution of the utility model, a number of evaporation tubes are arranged between the liquid separation tank and the liquid collection tank, and the evaporation tubes are evenly arranged between the liquid distribution tank and the liquid collection tank.

As a further improvement of the technical solution of the utility model, the power batteries are connected in parallel or in series to form a battery module.

As a further improvement of the technical solution of the utility model, the refrigeration circuit is provided with a flow regulating valve between the condenser and the expansion valve, and a shunt is formed through the flow regulating valve, and the shunt flows through the automobile HVAC and returns to the compressor.

Beneficial effects of the utility model: when the utility model works, the refrigerant is compressed into a high-temperature and high-pressure gas by the compressor, flows through the condenser, condenses into a low-temperature and high-pressure liquid, flows into the expansion valve, and becomes a low-temperature and low-pressure gas after passing through the expansion valve. The liquid flows into the evaporator, and the evaporator is closely attached to the power battery. The refrigerant absorbs heat and evaporates in the evaporator and becomes a gas, flows back to the compressor, and then enters the next cycle. Directly use air-conditioning refrigerant for heat exchange, high heat exchange efficiency, not affected by the external environment, can continue to be used even in hot summer, make the battery work within a suitable temperature range, improve the charge and discharge efficiency of the battery, and improve battery life; Improve battery pack life; ensure battery safety.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is a schematic diagram of the principle structure of the utility model;

Fig. 2 is a top view of the utility model evaporator structure;

Fig. 3 is a front view of the utility model evaporator structure;

Fig. 4 is a front view of the utility model power battery placed on the evaporator structure.

detailed description

Referring to Fig. 1 to Fig. 4, it has shown the concrete structure of the preferred embodiment of the present utility model. The structural features of each element of the present utility model will be described in detail below, and if there is a description to the direction (up, down, left, right, front and back), it is described with reference to the structure shown in Figure 1, but the utility model The actual use direction is not limited to this.

The utility model provides an automobile power battery cooling system, which includes a power battery 1 and a heat pump system, and the power batteries 1 are connected in parallel or in series to form a battery module. The heat pump system includes a compressor 2, a condenser 3, an expansion valve 4 and an evaporator 5, and the compressor 2, the condenser 3, the expansion valve 4 and the evaporator 5 are sequentially connected through pipelines to form a refrigeration circuit 6, and the refrigeration The circuit 6 is filled with refrigerant, the evaporator 5 is provided with a placement area, the power battery 1 is attached to the placement area, and the refrigerant is directly exchanged with the power battery 1 to improve heat exchange efficiency .

Wherein, the evaporator 5 includes a liquid separation tank 51, a liquid collection tank 52 and an evaporation pipe 53 communicating with the liquid separation tank 51 and the liquid collection tank 52, and several Evaporation pipes 53 are evenly arranged between the liquid distribution box 51 and the liquid collection box 52 . The liquid separation box 51 is provided with a working medium inlet 54, and the liquid collection tank 52 is provided with a working medium outlet 55. The evaporator 5 is connected to the refrigeration circuit 6 through the working medium inlet 54 and the working medium outlet 55. The liquid separation box 51 is connected to the N>1 evaporating tube 53 is connected, and the refrigerant is evenly distributed into each evaporating tube 53, so that the heat of each part of the power battery 1 is uniform and the temperature difference is reduced; the evaporator 5 forms a placement area outside the evaporating tube 53, and the evaporating tube 53 is closely attached to the power battery 1, and the heat of the power battery 1 is transferred to the refrigerant through its wall surface, and the refrigerant evaporates into gas after absorbing heat in the evaporation tube 53; the liquid collection tank 52 collects the gas coming out of the evaporation tube 53, and then The working fluid outlet 55 is delivered to the compressor 2 .

The refrigeration circuit 6 is provided with a flow regulating valve 7 between the condenser 3 and the expansion valve 4, and a branch 8 is formed through the flow regulating valve 7, and the branch 8 flows through the automobile HVAC 9 and returns to the compressor 2, and the flow is adjusted. The valve 7 can automatically adjust the loop flow through the power battery 1 according to the internal temperature feedback signal of the power battery 1, and control the temperature of the power battery 1 in an appropriate range.

The utility model mainly works according to the following steps:

The refrigerant is compressed into a high-temperature and high-pressure gas by the compressor 2, flows through the condenser 3, condenses into a low-temperature and high-pressure liquid, and then enters the flow regulating valve 7 for distribution. One way is shunted to the automobile HVAC9 for refrigeration, and the other way flows into the expansion valve 4 , after passing through the expansion valve 4, it becomes a low-temperature and low-pressure liquid, which flows into the liquid distribution tank 51, and the liquid distribution tank 51 distributes the liquid evenly into the evaporation tubes 53. After absorbing heat and evaporating in 53, it becomes gas, and then flows back to compressor 2 through liquid collecting tank 52, and then enters the next cycle.

Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art can also make equivalent modifications or replacements without violating the spirit of the present utility model. These equivalent modifications or replacements are all included in the claims of this application. within the limited range.

Claims (5)

1. An automobile power battery cooling system, characterized in that: it comprises a power battery and a heat pump system, and the heat pump system includes a compressor, a condenser, an expansion valve and an evaporator, and the compressor, a condenser, an expansion valve and an evaporator The evaporators are sequentially connected through pipelines to form a refrigeration circuit, the refrigeration circuit is filled with refrigerant, the evaporator is provided with a placement area, and the power battery is attached to the placement area. 2. The vehicle power battery cooling system according to claim 1, characterized in that: the evaporator comprises a liquid separation tank, a liquid collection tank and an evaporation pipe connecting the liquid separation tank and the liquid collection tank, and the evaporator is evaporating The outer side of the tube forms a placement area, the liquid separation tank is provided with a working medium inlet, and the liquid collection tank is provided with a working medium outlet, and the evaporator is connected to the refrigeration circuit through the working medium inlet and the working medium outlet. 3. The automotive power battery cooling system according to claim 2, characterized in that: a number of evaporation tubes are arranged between the liquid separation tank and the liquid collection tank, and the evaporation tubes are evenly arranged in the liquid separation tank and the liquid collection tank between. 4. The vehicle power battery cooling system according to claim 1, 2 or 3, wherein the power batteries are connected in parallel or in series to form a battery module. 5. The automotive power battery cooling system according to claim 1, 2 or 3, characterized in that: the refrigeration circuit is provided with a flow regulating valve between the condenser and the expansion valve, and a branch is formed through the flow regulating valve, The shunt flows through the car's HVAC and back to the compressor.