Heat exchange amount detection device for direct cooling and direct heating system of battery pack

Abstract

The utility model discloses a heat exchange amount detection device for a direct cooling and direct heating system of a battery pack. The heat exchange amount detection device comprises a cold plate, a liquid cooling unit and the direct cooling and direct heating system, the cold plate comprises a cold plate water system and a cold plate direct cooling system which are attached to each other. The refrigerant output end of the cold plate direct cooling system is connected with the input end of the direct cooling and direct heating system through a pipeline, and the output end of the direct cooling and direct heating system is connected with the refrigerant input end of the cold plate direct cooling system through a pipeline. The water outlet end of the cold plate water system is connected with the input end of the liquid cooling unit through a pipeline, and the output end of the liquid cooling unit is connected with the water inlet end of the cold plate water system through a pipeline; the water inlet end and the water outlet end of the cold plate water system are connected with temperature probes, and a pipeline between the water outlet end of the cold plate water system and the liquid cooling unit is connected with a flow meter. Through the arrangement, the function of detecting the heat exchange amount of the direct cooling and direct heating system of the battery pack can be realized.

Description

Technical Field

[0001] The utility model is mainly used in the technical field of heat exchange testing technology, and specifically relates to a heat exchange detection device for a direct cooling and direct heating system of a battery pack. Background Art

[0002] In thermodynamics, heat transfer usually refers to the amount of heat that can be removed by the contact between different media. At present, the laboratory method for heat transfer detection usually adopts the enthalpy difference method or the room heat balance method.

[0003] Among them, the enthalpy difference method is a method for measuring the performance of air conditioning systems based on the thermodynamic properties of air. It measures the changes in parameters such as temperature and humidity when air passes through various components of the air conditioning system during circulation, and calculates the enthalpy difference of air, that is, the difference in heat content per unit mass of air under different conditions. The enthalpy difference method is mainly used to evaluate the cooling / heating capacity, energy efficiency and other performance indicators of air conditioning systems.

[0004] The room heat balance method uses a partition wall to divide the test room into two parts, indoor and outdoor. Heaters, humidifiers, air coolers and other equipment are placed on both sides to form the indoor and outdoor working conditions required for the air conditioner test. The energy absorbed from the indoor side by the air conditioner is supplemented by the heater and humidifier on the indoor side. After the air conditions on the indoor and outdoor sides are completely stable, the energy supplemented from the outside to the indoor side is equal to the cooling capacity of the air conditioner.

[0005] Based on the above description of the enthalpy difference method and the room heat balance method, it can be understood that the laboratory method of the prior art is not yet suitable for the heat exchange capacity detection of the direct cooling and direct heating system of the battery pack. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a heat exchange capacity detection device for a direct cooling and direct heating system of a battery pack, which can realize the function of detecting the heat exchange capacity of the direct cooling and direct heating system of the battery pack.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A heat exchange detection device for a direct cooling and direct heating system of a battery pack, comprising a cold plate, a liquid cooling unit and a direct cooling and direct heating system;

[0009] The cold plate includes a cold plate water system and a cold plate direct cooling system which are attached to each other;

[0010] The refrigerant output end of the cold plate direct cooling system is connected to the input end of the direct cooling and direct heating system through a pipeline, and the output end of the direct cooling and direct heating system is connected to the refrigerant input end of the cold plate direct cooling system through a pipeline;

[0011] The water outlet of the cold plate water system is connected to the input end of the liquid cooling unit through a pipeline, and the output end of the liquid cooling unit is connected to the water inlet of the cold plate water system through a pipeline; the water inlet and outlet of the cold plate water system are both connected to temperature probes, and the pipeline between the water outlet of the cold plate water system and the liquid cooling unit is connected to a flow meter.

[0012] Furthermore, a liquid supply expansion valve is connected to the pipeline between the output end of the direct cooling and direct heating system and the cold plate direct cooling system.

[0013] Furthermore, the temperature probes at the water inlet and outlet of the cold plate water system are used to detect the water inlet temperature and the water outlet temperature respectively, and the water outlet temperature is controlled within the range of 18±1°C during operation.

[0014] Furthermore, surfaces of the cold plate water system and the cold plate direct cooling system are both provided with heat conducting layers, and the heat conducting layers of the cold plate water system and the cold plate direct cooling system are bonded to each other.

[0015] Furthermore, the liquid cooling unit adopts a water cooler.

[0016] The utility model has the following beneficial effects:

[0017] The utility model directly connects the cold plate through the direct cooling and direct heating system, and cools or heats the cold plate, exchanges heat after contacting the cold plate refrigeration system through the cold plate water system, and then obtains the outlet water temperature and inlet water temperature of the cold plate water system through the temperature probe according to the heat exchange calculation formula to obtain the temperature difference of the water in the water circulation of the cold plate water system, and at the same time obtains the water flow rate discharged from the cold plate water system to the liquid cooling unit through the flow meter, and then obtains the corresponding heat exchange, and finally determines the heat exchange of the battery pack direct cooling and direct heating system under rated conditions. The structure of the heat exchange detection device of the utility model is relatively simple, and compared with the enthalpy difference method or room heat balance method adopted by the laboratory method of the prior art, it can be better applied to the battery pack direct cooling and direct heating system, and has the advantages of efficient and convenient heat exchange test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the heat exchange capacity detection device of the utility model.

[0019] In the figure: 1. Direct cooling and direct heating system; 2. Cold plate refrigeration system; 3. Cold plate water system; 4. Liquid cooling unit; 5. Temperature probe; 6. Flow meter; 7. Liquid supply expansion valve. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. The terms such as "upper", "inner", "middle", "left", "right" and "one" used in this specification are only used to facilitate the description and are not used to limit the scope of the present invention. The changes or adjustments in their relative relationships shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0021] A heat exchange detection device for a battery pack direct cooling and direct heating system, such as Figure 1 As shown, it includes a cold plate and a liquid cooling unit 4 and a direct cooling and heating system 1 connected to the cold plate, wherein the cold plate is used to simulate the state of the direct cooling plate of the battery pack being cooled or heated, and the liquid cooling unit 4 is used to control the water temperature of the water involved in the heat exchange.

[0022] The cold plate includes a cold plate water system 3 and a cold plate direct cooling system that are in contact with each other. The surfaces of the cold plate water system 3 and the cold plate direct cooling system are both provided with a heat conducting layer (not shown in the figure), and the heat conducting layer is made of metal material. The heat conducting layers of the cold plate water system 3 and the cold plate direct cooling system are in contact with each other, thereby realizing the heat transfer function between the cold plate water system 3 and the cold plate direct cooling system.

[0023] The refrigerant output end of the cold plate direct cooling system is connected to the input end of the direct cooling and direct heating system 1 through a pipe, and the output end of the direct cooling and direct heating system 1 is connected to the refrigerant input end of the cold plate direct cooling system through a pipe. Therefore, when the direct cooling and direct heating system 1 is working (such as cooling or heating), the refrigerant can be transmitted between the direct cooling and direct heating system 1 and the cold plate direct cooling system, thereby realizing heat exchange.

[0024] In this embodiment, the pipeline between the output end of the direct cooling and direct heating system 1 and the cold plate direct cooling system is connected with a liquid supply expansion valve 7. By setting the liquid supply expansion valve 7 and then controlling the valve opening of the liquid supply expansion valve 7, the function of controlling the refrigerant flow rate flowing into the cold plate direct cooling system is achieved.

[0025] The water outlet of the cold plate water system 3 is connected to the input end of the liquid cooling unit 4 through a pipeline, and the output end of the liquid cooling unit 4 is connected to the water inlet of the cold plate water system 3 through a pipeline. The water outlet and water inlet of the cold plate water system 3 are both connected with temperature probes 5 (defined as T1 and T2, respectively), and the temperature difference between the water inlet and the water outlet of the cold plate water system 3 can be measured by the two temperature probes 5. The pipeline between the water outlet of the cold plate water system 3 and the liquid cooling unit 4 is connected with a flow meter 6, and the flow rate of water flowing from the cold plate water system 3 to the liquid cooling unit 4 can be measured by the flow meter 6.

[0026] The liquid cooling unit 4 of this embodiment adopts a conventional water cooling machine, and water can be circulated between the cold plate direct cooling system and the liquid cooling unit 4 to achieve heat exchange.

[0027] At the same time, in the utility model, the temperature probes 5 at the water inlet and outlet ends of the cold plate water system 3 are respectively used to detect the water inlet temperature and the water outlet temperature. In actual operation, the water outlet temperature is controlled within the range of 18±1°C to control the measurement of the heat exchange rate within the corresponding controllable range, thereby realizing the application of heat exchange rate detection of various battery pack direct cooling and direct heating systems 1 in the prior art.

[0028] Based on the introduction of the heat exchange detection device, the test conditions for the heat exchange test are set. The specific settings are shown in Table 1 and Table 2, and then the heat exchange of the direct cooling and direct heating system 1 under rated conditions is verified, which is as follows:

[0029] Table 1: Test conditions

[0030]

[0031] Table 2: Direct cooling and direct heating system parameter settings

[0032]

[0033] 1) Test of cooling capacity of battery pack direct cooling and heating system 1

[0034] The ambient temperature is adjusted to 38°C, the direct cooling and heating system 1, the cold plate and the liquid cooling unit 4 are started, the boundary parameters of the direct cooling and heating system 1 are controlled according to Table 2, adjusted to the rated flow rate, and the outlet water temperature is controlled within the range of 18°C±1°C; after the system runs stably, the outlet water temperature T2, the inlet water temperature T1, and the water flow rate discharged from the cold plate water system 3 to the liquid cooling unit 4 are measured and recorded (the water flow rate is defined as q), and then the cooling capacity of the refrigeration process of the direct cooling and heating system 1 is calculated according to the heat exchange calculation formula. The heat exchange of the utility model can refer to the cooling capacity or the heating capacity according to different working conditions, and both are defined as Q.

[0035] The heat exchange calculation formula is as follows: Q = q × ρ × c × (T2-T1), where Q is the cooling capacity, in units of (kW); q is the water flow rate from the cold plate water system 3 to the liquid cooling unit 4, in units of (m 3 / s); ρ is the density of cooling coal (water), unit is (kg / m 3 ); c is the specific heat capacity of water, and its unit is (kJ / (kg·℃)); thus, the cooling capacity value of the direct cooling and direct heating system 1 during the refrigeration process is obtained through the above heat exchange calculation formula.

[0036] 2) Test of heating capacity of battery pack direct cooling and heating system 1

[0037] Adjust the ambient temperature to -20℃, start the direct cooling and heating system 1, the cold plate and the liquid cooling unit 4, control the boundary parameters of the direct cooling and heating system 1 according to Table 2, adjust to the rated flow, and control the outlet water temperature within the range of 18℃±1℃; after the system runs stably, measure and record the outlet water temperature T2, the inlet water temperature T1, and the water flow rate discharged from the cold plate water system 3 to the liquid cooling unit 4 (the water flow rate is defined as q), and then calculate the heating capacity Q of the refrigeration process of the direct cooling and heating system 1 according to the heat exchange calculation formula.

[0038] In summary, the utility model directly connects the cold plate through the direct cooling and direct heating system 1, and cools or heats the cold plate, exchanges heat after contacting the cold plate refrigeration system 2 through the cold plate water system 3, and then obtains the outlet water temperature and inlet water temperature of the cold plate water system 3 through the temperature probe 5 according to the heat exchange calculation formula, so as to obtain the temperature difference of the water in the water circulation of the cold plate water system 3, and at the same time obtains the water flow rate discharged from the cold plate water system 3 to the liquid cooling unit 4 through the flow meter 6, and then obtains the corresponding heat exchange, and finally determines the heat exchange of the battery pack direct cooling and direct heating system 1 under rated conditions. The structure of the heat exchange detection device of the utility model is relatively simple, and compared with the enthalpy difference method or room heat balance method adopted by the laboratory method of the prior art, it can be better applied to the battery pack direct cooling and direct heating system 1, and has the advantages of efficient and convenient heat exchange test.

[0039] The implementation methods of the utility model are not limited to this. According to the above content of the utility model, by using common technical knowledge and customary means in the field, without departing from the above basic technical ideas of the utility model, the utility model can also make other various forms of modification, replacement or combination, all of which fall within the scope of protection of the utility model.

Claims

1. A heat exchange detection device for a battery pack direct cooling and direct heating system, characterized in that: Including cold plates, liquid cooling units and direct cooling and heating systems; The cold plate includes a cold plate water system and a cold plate direct cooling system which are attached to each other; The refrigerant output end of the cold plate direct cooling system is connected to the input end of the direct cooling and direct heating system through a pipeline, and the output end of the direct cooling and direct heating system is connected to the refrigerant input end of the cold plate direct cooling system through a pipeline; The water outlet of the cold plate water system is connected to the input end of the liquid cooling unit through a pipeline, and the output end of the liquid cooling unit is connected to the water inlet of the cold plate water system through a pipeline; the water inlet and outlet of the cold plate water system are both connected to temperature probes, and the pipeline between the water outlet of the cold plate water system and the liquid cooling unit is connected to a flow meter.

2. The heat exchange capacity detection device for a direct cooling and heating system of a battery pack according to claim 1, characterized in that: A pipeline between the output end of the direct cooling and direct heating system and the cold plate direct cooling system is connected with a liquid supply expansion valve.

3. The heat exchange capacity detection device for a direct cooling and heating system of a battery pack according to claim 1, characterized in that: The temperature probes at the water inlet and water outlet of the cold plate water system are used to detect the water inlet temperature and water outlet temperature respectively, and the water outlet temperature is controlled within the range of 18±1°C during operation.

4. The heat exchange detection device for a direct cooling and heating system of a battery pack according to claim 1, characterized in that: The surfaces of the cold plate water system and the cold plate direct cooling system are both provided with heat conducting layers, and the heat conducting layers of the cold plate water system and the cold plate direct cooling system are bonded to each other.

5. The heat exchange detection device for a direct cooling and heating system of a battery pack according to claim 1, characterized in that: The liquid cooling unit adopts a water cooler.

Images