Efficient heat dissipation pack box

Abstract

The utility model provides an efficient heat dissipation pack box, which comprises a box body and a liquid cooling temperature control unit, a liquid cooling plate, an insulating heat conduction pad and a battery cell module are sequentially arranged in the box body from top to bottom, a liquid cooling cavity is arranged on the liquid cooling plate, and the liquid cooling temperature control unit comprises a plate heat exchanger, an evaporator, a compressor, a condenser and an electronic expansion valve. The evaporator is arranged on the plate heat exchanger, the evaporator, the compressor, the condenser and the electronic expansion valve are sequentially connected through a pipeline to form a cooling loop, and a refrigerant circulates in the pipeline; the liquid cooling plate is provided with a water cooling interface, and the liquid cooling plate is connected with the plate heat exchanger in the liquid cooling temperature control unit through the water cooling interface, the circulating water pump and a flow channel to achieve circulation of cooling liquid in the liquid cooling cavity. According to the utility model, the rising of the temperature of the battery cells can be effectively controlled in a contact heat dissipation manner from the top of the pack box through the liquid cooling plate, a better temperature equalizing effect is created for a system, the upper temperature limit of the battery cells is reduced, and the temperature difference between battery packs is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pack boxes, and in particular relates to a pack box with high-efficiency heat dissipation. Background Art

[0002] As most of the new energy generation methods are related to the natural environment, such as photovoltaic power generation and wind power generation, which are affected by weather conditions, the output of energy is unstable. In addition, the increase in new energy vehicles has also posed a great challenge to the distribution capacity of the original power grid system in some areas. The energy storage system provides an effective solution. The energy storage system can store excess electricity when the energy is sufficient, and output the electricity of the energy storage system when the energy is insufficient, thereby ensuring the stability of the operation of the power system.

[0003] At present, the mainstream energy storage battery specifications for large storage and industrial and commercial storage are 280Ah, weighing about 5.5 kilograms, and generally 72mm*174mm*205mm in size. It has both large capacity and small size, but it also leads to large heat generation and difficult heat dissipation. If the thermal management solution is unreasonable, the cycle life of the battery will be seriously affected, and even safety problems will arise. The existing energy storage pack box generally dissipates heat from the battery pack through air cooling or liquid cooling. Air cooling has the advantages of simple structure, easy maintenance, and low cost, but the heat dissipation efficiency, heat dissipation speed and temperature uniformity are poor, and it is only suitable for occasions with low heat generation rate. The current industrial and commercial and ground energy storage pack box system has high energy density, and air cooling cannot achieve fast and effective cooling. The existing liquid cooling heat dissipation reduces the battery temperature through the convection of the cooled liquid, but the current liquid cooling method mainly adopts the method of adding a thermal pad, a top liquid cooling plate, a refrigerant in the liquid cooling plate, and a bottom liquid cooling plate at the bottom of the pack box. The temperature of the pack box is adjusted by the refrigerant at the bottom of the pack box. The heat dissipation efficiency, heat dissipation speed and temperature uniformity are better than the air cooling system. However, the bottom liquid cooling solution is difficult to control the rise in battery cell temperature, and the battery cell temperature will still be very high, and the effect of reducing the temperature difference of the battery pack is limited. Summary of the invention

[0004] Purpose of the invention: In view of the deficiencies in the prior art, the purpose of the utility model is to provide a pack box with efficient heat dissipation.

[0005] Technical solution: The utility model provides a pack box with high efficiency in heat dissipation, including a box body and a liquid cooling temperature control unit. The box body is provided with a liquid cooling plate, an insulating thermal pad, and a battery module from top to bottom. The liquid cooling plate has a liquid cooling cavity. The liquid cooling temperature control unit includes a plate heat exchanger, an evaporator, a compressor, a condenser, and an electronic expansion valve. The evaporator is arranged on the plate heat exchanger. The evaporator, the compressor, the condenser, and the electronic expansion valve are connected in sequence through pipelines, and then the electronic expansion valve is connected to the evaporator pipeline to form a cooling circuit. Refrigerant circulates in the pipeline.

[0006] The liquid cooling plate is provided with a water cooling interface, which is divided into a water cooling inlet and a water cooling outlet. The liquid cooling plate is connected to the plate heat exchanger in the liquid cooling temperature control unit through the water cooling interface and the circulating water pump through the flow channel to realize the circulation of the coolant in the liquid cooling cavity.

[0007] Furthermore, the liquid cooling plate and the plate heat exchanger are both provided with temperature sensors, and the temperature sensors are electrically connected to the liquid cooling temperature control unit.

[0008] Furthermore, the liquid-cooled temperature control unit can adjust the opening of the electronic expansion valve.

[0009] Furthermore, the upper flow channel of the plate heat exchanger is configured to be S-shaped.

[0010] Furthermore, the evaporator is a plate evaporator.

[0011] Furthermore, the condenser is a finned condenser.

[0012] Furthermore, the flow channel is a hose.

[0013] Working principle: The coolant transfers the heat absorbed by the battery liquid cold plate to the plate heat exchanger through the water pump and releases it through the evaporator. Then, it uses the power generated by the water pump to re-enter the cold plate to absorb the heat generated by the battery cell module. The heat absorbed by the evaporator from the coolant circulation system is absorbed by the refrigerant evaporation. The refrigerant enters the condenser after being compressed by the compressor. The heat is released into the surrounding air environment through the condensation of the refrigerant. The condensed refrigerant returns to the evaporator through the expansion valve and is evaporated again. The cycle repeats to achieve efficient heat dissipation of the pack box.

[0014] Beneficial effects: Compared with the prior art, the utility model has the following advantages: (1) The contact heat dissipation method from the top of the pack box through the liquid cooling plate can effectively control the temperature rise of the battery cell and create a better temperature uniformity effect for the system. The upper temperature limit of the battery cell is lowered, and the temperature difference between battery packs is reduced. (2) The refrigerant circulation path is short, which reduces the amount of circulating refrigerant and improves the efficiency of heat exchange with the coolant. (3) The heat-generating parts of the battery cell are mainly concentrated in the middle and upper parts and the pole ears. According to the true principle of thermal flow, a thermal pad and refrigerant are installed on the top, and the cooling effect is better than the heat dissipation effect at the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a pack box structure with high efficiency heat dissipation provided by the utility model;

[0016] Figure 2 The utility model provides an operation schematic diagram of a pack box with high efficiency heat dissipation. DETAILED DESCRIPTION

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] like Figure 1-Figure 2 As shown, the utility model provides a pack box with high efficiency in heat dissipation, including a box body 1 and a liquid cooling temperature control unit 5. The box body 1 is provided with a liquid cooling plate 2, an insulating thermal pad 3, and a battery module 4 from top to bottom. The liquid cooling plate 2 has a liquid cooling cavity. The liquid cooling temperature control unit 5 includes a plate heat exchanger 8, an evaporator 9, a compressor 10, a condenser 11, and an electronic expansion valve 12. The evaporator 9 is arranged on the plate heat exchanger 8. The evaporator 9, the compressor 10, the condenser 11, and the electronic expansion valve 12 are connected in sequence through pipelines. The electronic expansion valve 12 is connected to the evaporator 9 by a pipeline to form a cooling circuit, and a refrigerant circulates in the pipeline; a water cooling interface 6 is provided on the liquid cooling plate 2, and the water cooling interface 6 is divided into a water cooling inlet and a water cooling outlet. The liquid cooling plate 2 is connected to the plate heat exchanger 8 in the liquid cooling temperature control unit 5 through the water cooling interface 6 and the circulating water pump 7 through the flow channel to realize the circulation of the coolant in the liquid cooling cavity; the liquid cooling plate 2 and the plate heat exchanger 8 are both provided with a temperature sensor, and the temperature sensor is electrically connected to the liquid cooling temperature control unit 5; the liquid cooling temperature control unit 5 can adjust the opening of the electronic expansion valve 12. The flow channel on the plate heat exchanger 8 is set to be S-shaped; the evaporator 9 is a plate evaporator. The condenser 11 is a finned condenser. The flow channel is a hose.

[0019] like Figure 2As shown, when the efficient heat dissipation pack box provided by the utility model is in operation, the coolant transports the heat absorbed by the liquid cold plate to the plate heat exchanger through the water pump and releases it through the evaporator. Then, using the power generated by the operation of the water pump, it re-enters the cold plate to continue absorbing the heat generated by the battery cell module. The heat absorbed by the evaporator in the plate heat exchanger from the coolant circulation system is absorbed by the evaporation of the refrigerant. The refrigerant then enters the condenser after being compressed by the compressor. The heat is released into the surrounding air environment through the condensation of the refrigerant. The condensed refrigerant then returns to the evaporator through the expansion valve and is evaporated again. The cycle repeats to achieve efficient heat dissipation of the pack box. The liquid-cooled temperature control unit can timely adjust the opening of the electronic expansion valve through the temperature data fed back by the temperature sensors on the liquid cold plate and the plate heat exchanger to achieve energy-saving and efficient cooling.

[0020] According to the results of thermal imaging and thermal simulation during actual use, the temperature characteristics of the entire battery cell are that the temperature at the bottom of the battery cell is relatively low, and the temperature gradually increases from the bottom to the top. The heat-generating parts of the battery cell are mainly concentrated in the middle and upper parts and the pole ears. According to the true principle of thermal flow, a thermal pad and a refrigerant are installed on the top, and the cooling effect is better than the heat dissipation effect at the bottom. From the perspective of the heat transfer path of the battery, the path from the battery heat source to the bottom is longer than the path from the heat source to the top, so the contact heat dissipation from the bottom through the cold plate is not ideal. According to the measured battery cell temperature data (collecting the top temperature of the battery cell), if the bottom liquid cooling heat dissipation solution is used, it is difficult to control the rise of the battery cell temperature. The highest temperature reaches 35°C, and the temperature difference of the battery cell inside the pack box reaches 5.5°C. The top liquid cooling heat dissipation solution of the utility model can effectively control the rise of the battery cell temperature, and the temperature difference of the battery cell inside the pack is about 3°C, achieving an excellent temperature uniformity effect.

Claims

1. A pack box with high efficiency heat dissipation, characterized in that: The invention comprises a box (1) and a liquid-cooling temperature control unit (5), wherein the box (1) is provided with a liquid-cooling plate (2), an insulating heat-conducting pad (3), and a battery module (4) in order from top to bottom, and the liquid-cooling plate (2) is provided with a liquid-cooling cavity, and the liquid-cooling temperature control unit (5) comprises a plate-type heat exchanger (8), an evaporator (9), a compressor (10), a condenser (11), and an electronic expansion valve (12), wherein the evaporator (9) is provided on the plate-type heat exchanger (8); the evaporator (9), the compressor (10), the condenser (11), and the electronic expansion valve (12) The condenser (11) and the electronic expansion valve (12) are connected in sequence through pipelines, and then the electronic expansion valve (12) is connected to the evaporator (9) through pipelines to form a cooling circuit, and refrigerant circulates in the pipelines; the liquid cooling plate (2) is provided with a water cooling interface (6), and the water cooling interface (6) is divided into a water cooling inlet and a water cooling outlet. The liquid cooling plate (2) is connected to the plate heat exchanger (8) in the liquid cooling temperature control unit (5) through the water cooling interface (6) and the circulating water pump (7) through the flow channel to realize the circulation of the cooling liquid in the liquid cooling cavity.

2. The high-efficiency heat dissipation pack box according to claim 1, characterized in that: The liquid cooling plate (2) and the plate heat exchanger (8) are both provided with temperature sensors, and the temperature sensors are electrically connected to the liquid cooling temperature control unit (5).

3. The high-efficiency heat dissipation pack box according to claim 1, characterized in that: The liquid-cooled temperature control unit (5) can adjust the opening of the electronic expansion valve (12).

4. The high-efficiency heat dissipation pack box according to claim 1, characterized in that: The flow channel on the plate heat exchanger (8) is configured to be S-shaped.

5. The efficient heat dissipation pack box according to claim 1, characterized in that: The evaporator (9) is a plate-type evaporator.

6. The high-efficiency heat dissipation pack box according to claim 1, characterized in that: The condenser (11) is a fin-type condenser.

7. The efficient heat dissipation pack box according to claim 1, characterized in that: The flow channel is a hose.

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