A new energy power battery low temperature test heating control device and method

Abstract

The present invention discloses a new energy power battery low temperature test heating control device and method. The new energy power battery low temperature test heating control device comprises a power battery heating system and a heat exchange temperature control system. The power battery heating system heats the battery pack under low temperature conditions. The heat exchange temperature control system exchanges heat with the power battery heating system to accurately control the temperature of the refrigerant transported by the power battery heating system. The present invention adopts a heat exchange temperature control system with high temperature control accuracy and many temperature adjustment links. The pressure and temperature can be adjusted step by step at different positions in the pipeline through feedback. The adjustment method is very flexible, so as to achieve accurate temperature control of the new energy power battery in a low temperature simulation environment.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery testing equipment, and in particular to a new energy power battery low temperature testing heating control device and method. Background Art

[0002] Under low temperature conditions, the performance of new energy batteries decreases due to factors such as increased internal resistance of the battery, difficulty in lithium battery migration, and the performance of positive electrode materials and electrolytes being affected by temperature. Therefore, if the battery can be operated under suitable conditions even at low temperatures, new energy vehicles will be able to perform better under winter conditions.

[0003] In order to meet the temperature conditions of the battery pack under low temperature conditions, most of the following two methods are currently used: 1) laying an electric heating film on the surface of the battery pack and judging the start of electric heating based on the temperature of the battery pack; 2) a thin-film electric heater heats the water coolant and transports it to the inside of the battery pack through an electronic pump to heat the battery;

[0004] However, the above two methods can heat up the battery, but they also consume battery power during heating, and the energy efficiency ratio is not high. Therefore, there is an urgent need to find a method that can quickly heat the battery and reduce energy efficiency. Combined with the application of heat pump technology in household air conditioners, the first-level energy efficiency level has reached 3.6. Therefore, the heat pump technology can be upgraded and optimized to provide a suitable heat source for the battery and provide hot air to the passenger compartment in winter, achieving multiple effects at one stroke.

[0005] Before the power battery is installed in the vehicle, the performance of the battery must be tested first. The purpose of the test is to simulate the environment of the actual vehicle to the extreme. Therefore, it is urgent to design a temperature control system and temperature control method to simulate the heating of the car under low temperature conditions to the extreme. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] Therefore, the purpose of the present invention is to provide a new energy power battery low temperature test heating control device and method, which can simulate the environment of a new energy power battery real vehicle to the extreme and test the new energy power battery.

[0008] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0009] A new energy power battery low temperature test heating control device, comprising:

[0010] The power battery heating system heats the battery pack under low temperature conditions;

[0011] The heat exchange and temperature control system exchanges heat with the power battery heating system to accurately control the temperature of the refrigerant delivered by the power battery heating system.

[0012] As a preferred solution of the new energy power battery low-temperature test heating control equipment described in the present invention, the power battery heating system includes a first compressor and an oil separator connected to the exhaust end of the first compressor to separate oil and gas, and the separated oil is returned to the compressor through a branch.

[0013] As a preferred solution of a new energy power battery low temperature test heating control device described in the present invention, the power battery heating system further includes a superheat heat exchanger whose refrigerant inlet is connected to the exhaust end of the oil separator, a heating pipeline whose inlet is connected to the refrigerant outlet of the superheat heat exchanger and heats the battery pack, and a first pipeline collection control unit arranged on the heating pipeline at the inlet side of the battery pack and a second pipeline collection control unit arranged on the outlet side of the heating pipeline;

[0014] The outlet of the heating pipeline is connected to the inlet of the first compressor.

[0015] As a preferred solution of the new energy power battery low-temperature test heating control device described in the present invention, the first pipeline acquisition control unit includes a battery pack inlet valve, a battery pack inlet pressure sensor and a battery pack inlet temperature sensor arranged on the heating pipeline at the battery pack inlet side.

[0016] As a preferred solution of the new energy power battery low-temperature test heating control device described in the present invention, the second pipeline acquisition control unit includes a battery pack outlet valve, a battery pack outlet pressure sensor and a battery pack inlet and outlet temperature sensors arranged on the heating pipeline at the battery pack outlet side.

[0017] As a preferred solution of the new energy power battery low temperature test heating control device described in the present invention, the power battery heating system also includes a flow meter and a first electric heater arranged on the pipeline between the first compressor and the second pipeline collection control unit.

[0018] As a preferred solution of a new energy power battery low temperature test heating control device described in the present invention, the heat exchange temperature control system includes a circulation pump connected to the coolant inlet of the superheat heat exchanger, an auxiliary heat exchanger whose coolant inlet is connected to the coolant outlet of the superheat heat exchanger, an expansion tank connected to the coolant outlet of the auxiliary heat exchanger, a second compressor connected to the refrigerant outlet of the auxiliary heat exchanger, and a condenser connected to the outlet of the second compressor;

[0019] Wherein, a second electric heater is arranged on the pipeline at the inlet of the circulation pump, and a throttle valve is arranged on the pipeline between the condenser and the auxiliary heat exchanger.

[0020] An operating method of a new energy power battery low temperature test heating control device, the specific steps are as follows:

[0021] S1. The refrigerant in the heat exchange and temperature control system first ejects high-temperature and high-pressure gas from the second compressor, cools down through the condenser, enters the auxiliary heat exchanger, and exchanges heat with the secondary coolant that has passed through the auxiliary heat exchanger to cool down the secondary coolant. The refrigerant that has exchanged heat with the secondary coolant re-enters the second compressor to continue circulating, and the secondary coolant that has been cooled down is heated to a predetermined temperature by the second electric heater, and then continuously circulated and transported by the circulating pump to the superheat heat exchanger, and exchanges heat with the high-temperature and high-pressure gas generated by compression by the first compressor.

[0022] S2, the refrigerant ejects high-temperature and high-pressure gas from the first compressor, and the oil and gas are separated by the oil separator. The oil flows back to the first compressor through the branch, and the high-temperature gas enters the superheat heat exchanger to exchange with the coolant that has reached the preset temperature. The coolant after the exchange re-enters the auxiliary heat exchanger to continue to exchange with the refrigerant that has been cooled by the condenser, and then re-enters the superheat heat exchanger to exchange heat with the subsequent refrigerant cycle. The refrigerant that has reached the preset temperature after exchanging with the coolant is heated by the heating pipeline to heat the battery pack. After the battery pack is heated, the refrigerant is heated by the first electric heater and then re-enters the first compressor to complete the next cycle of heating.

[0023] S3. In the process of heating the battery pack by the power battery heating system in a cycle, the control system continuously collects the inlet and outlet temperatures and pressures of the battery pack through the first pipeline collection control unit and the second pipeline collection control unit, calculates the flow through the battery pack through the flowmeter, and calculates the heat provided to the battery pack, and then controls the output power of the first electric heater, the second electric heater and the second compressor, so that the heat supplied to the battery pack by the power battery heating system reaches a preset temperature, and in the process of heating the battery pack by the power battery heating system in a cycle, the rate of increase of the inlet pressure of the battery pack is limited by adjusting the battery pack inlet valve, and according to the real-time battery pack inlet pressure, it is converted into a corresponding saturation temperature, and the sum of the saturation temperature and the set deviation value is used as the set temperature of the overheating system, so as to meet the inlet overheating requirement, and the outlet temperature of the battery pack is controlled by the battery pack outlet valve, that is, when the outlet supercooling degree is large, the battery pack outlet valve is opened wide, and vice versa, the outlet valve is opened small, so as to control the outlet supercooling degree of the battery pack.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts a heat exchange temperature control system with high temperature control accuracy and multiple temperature adjustment links. The pressure and temperature can be adjusted step by step at different positions in the pipeline through feedback. The adjustment method is very flexible, so as to achieve precise temperature control of new energy power batteries in a low-temperature simulation environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0026] Figure 1 It is a structural schematic diagram of a new energy power battery low temperature test heating control device of the present invention. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] The present invention provides a new energy power battery low temperature test heating control device and method, which can simulate the environment of a new energy power battery actual vehicle to the extreme and test the new energy power battery.

[0031] Figure 1 The structure diagram of a new energy power battery low temperature test heating control device according to the present invention is shown. Figure 1 In this embodiment, a new energy power battery low temperature test heating control device is provided, and its main parts include a power battery heating system 100 and a heat exchange temperature control system 200 .

[0032] The power battery heating system 100 heats the battery pack H under low temperature conditions. Specifically, in the present embodiment, the power battery heating system 100 includes a first compressor 110 and an oil separator 120 connected to the exhaust end of the first compressor 110 to separate oil and gas, and return the separated oil to the first compressor 110 through a branch. The power battery heating system 100 also includes an overheat heat exchanger 130 whose refrigerant inlet is connected to the exhaust end of the oil separator 120, a heating pipeline 140 whose inlet is connected to the refrigerant outlet of the overheat heat exchanger 130 and heats the battery pack H, and a first pipeline collection control unit 150 arranged on the heating pipeline 140 at the inlet side of the battery pack H and a second pipeline collection control unit 160 arranged on the outlet side of the heating pipeline 140 at the battery pack H. The outlet of the heating pipeline 140 is connected to the inlet of the first compressor 110. The first pipeline collection control unit 150 includes a battery pack inlet valve 150a and a battery pack inlet pressure sensor 160 arranged on the heating pipeline 140 at the inlet side of the battery pack H. 50b and a battery pack inlet temperature sensor 150c, the second pipeline acquisition control unit 160 includes a battery pack outlet valve 160a, a battery pack outlet pressure sensor 160b and a battery pack inlet and outlet temperature sensor 160c arranged on the heating pipeline 140 at the battery pack H outlet side. When in use, the refrigerant ejects high-temperature and high-pressure gas from the first compressor 110, and the oil and gas are separated by the oil separator 120. The oil flows back to the first compressor 110 through the branch, and the high-temperature gas enters the superheat heat exchanger 1 30 is exchanged with the coolant that has reached the preset temperature. The exchanged coolant re-enters the auxiliary heat exchanger 220 to continue to exchange with the refrigerant that has been cooled by the condenser 250, and then re-enters the superheat heat exchanger 130 for heat exchange with the subsequent refrigerant cycle. The refrigerant that has reached the preset temperature after exchanging with the coolant is used to heat the battery pack H through the heating pipeline 140. After the battery pack H is heated, the refrigerant is heated by the first electric heater 180 and then re-enters the first compressor 110 to complete the next cycle of heating.

[0033] The heat exchange and temperature control system 200 exchanges heat with the power battery heating system 100 to accurately control the temperature of the refrigerant transported by the power battery heating system 100. Specifically, in the present embodiment, the heat exchange and temperature control system 200 includes a circulating pump 210 connected to the refrigerant inlet of the superheat heat exchanger 130, an auxiliary heat exchanger 220 whose refrigerant inlet is connected to the refrigerant outlet of the superheat heat exchanger 130, an expansion tank 230 connected to the refrigerant outlet of the auxiliary heat exchanger 220, a second compressor 240 connected to the refrigerant outlet of the auxiliary heat exchanger 220, and a condenser 250 connected to the outlet of the second compressor 240, wherein a second electric heater 260 is provided on the pipeline at the inlet of the circulating pump 210, and the condenser 250 is connected to the refrigerant outlet of the auxiliary heat exchanger 220. A throttle valve 270 is provided on the pipeline between the compressor 250 and the auxiliary heat exchanger 220. When in use, the refrigerant in the heat exchange and temperature control system 200 first ejects high-temperature and high-pressure gas from the second compressor 240, cools down through the condenser 250, and then enters the auxiliary heat exchanger 220, where it exchanges heat with the coolant passing through the auxiliary heat exchanger 220 to cool down the coolant. The refrigerant after exchanging with the coolant re-enters the second compressor 240 to continue circulating, and the cooled coolant is heated to a predetermined temperature by the second electric heater 260, and then continuously circulated and transported by the circulating pump 210 into the superheat exchanger 130, where it exchanges heat with the high-temperature and high-pressure gas compressed by the first compressor 110.

[0034] Combination Figure 1 The operation method of the new energy power battery low temperature test heating control device of this embodiment has the following specific steps:

[0035] S1. The refrigerant in the heat exchange and temperature control system 200 first ejects high-temperature and high-pressure gas from the second compressor 240, cools down through the condenser 250, and enters the auxiliary heat exchanger 220 to perform heat exchange with the secondary coolant that has passed through the auxiliary heat exchanger 220, so that the secondary coolant is cooled down. The refrigerant that has exchanged with the secondary coolant re-enters the second compressor 240 to continue circulating, and the secondary coolant that has been cooled down is heated to a predetermined temperature through the second electric heater 260, and then continuously circulated and transported through the circulating pump 210 to enter the superheat heat exchanger 130, and performs heat exchange with the high-temperature and high-pressure gas generated by compression through the first compressor 110;

[0036] S2, the refrigerant ejects high-temperature and high-pressure gas from the first compressor 110, and the oil and gas are separated by the oil separator 120. The oil flows back to the first compressor 110 through the branch, and the high-temperature gas enters the superheat heat exchanger 130 to exchange with the coolant that has reached the preset temperature. The exchanged coolant re-enters the auxiliary heat exchanger 220 to continue to exchange with the refrigerant cooled by the condenser 250, and then re-enters the superheat heat exchanger 130 to exchange heat with the subsequent refrigerant cycle. The refrigerant that has reached the preset temperature after exchanging with the coolant is heated by the heating pipeline 140 to heat the battery pack H. After the battery pack H is heated, the refrigerant is heated by the first electric heater 180 and then re-enters the first compressor 110 to complete the next cycle of heating.

[0037] S3. During the process of heating the battery pack H by the power battery heating system 100 in a cycle, the control system continuously collects the inlet and outlet temperatures and pressures of the battery pack H through the first pipeline collection control unit 150 and the second pipeline collection control unit 160, calculates the flow through the battery pack H through the flowmeter 170, and calculates the heat provided to the battery pack H, and then controls the output power of the first electric heater 180, the second electric heater 260 and the second compressor 240, so that the heat provided to the battery pack H by the power battery heating system 100 reaches a preset temperature, and during the process of heating the battery pack H by the power battery heating system 100 in a cycle, the rising rate of the inlet pressure of the battery pack H is limited by adjusting the battery pack inlet valve 150a, and according to the real-time inlet pressure of the battery pack H, the corresponding saturation temperature T is converted, and the sum of the saturation temperature T and the set deviation value is used as the set temperature of the overheating system, so as to meet the inlet overheating requirement, and the battery pack outlet temperature is controlled by the battery pack outlet valve 160a, that is, when the outlet supercooling degree is large, the battery pack outlet valve 160a is opened wide, and vice versa, the outlet supercooling degree of the battery pack H is controlled.

[0038] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A new energy power battery low temperature test heating control device, characterized in that: include: A power battery heating system (100) is used to heat a battery pack (H) in a low temperature condition; A heat exchange and temperature control system (200) performs heat exchange with the power battery heating system (100) to accurately control the temperature of the refrigerant delivered by the power battery heating system (100); The heat exchange and temperature control system (200) comprises a circulation pump (210) connected to a refrigerant inlet of a superheat heat exchanger (130), an auxiliary heat exchanger (220) whose refrigerant inlet is connected to a refrigerant outlet of the superheat heat exchanger (130), an expansion tank (230) connected to the refrigerant outlet of the auxiliary heat exchanger (220), a second compressor (240) connected to the refrigerant outlet of the auxiliary heat exchanger (220), and a condenser (250) connected to the outlet of the second compressor (240); Wherein, a second electric heater (260) is provided on the pipeline at the inlet of the circulation pump (210), and a throttle valve (270) is provided on the pipeline between the condenser (250) and the auxiliary heat exchanger (220); The heat exchange process between the heat exchange temperature control system (200) and the power battery heating system (100) is as follows: The refrigerant in the heat exchange and temperature control system (200) first ejects high-temperature and high-pressure gas from the second compressor (240), cools down through the condenser (250) and the throttle valve (270), and then enters the auxiliary heat exchanger (220), performs heat exchange with the secondary coolant that has passed through the auxiliary heat exchanger (220), cools down the secondary coolant, and the refrigerant that has exchanged with the secondary coolant re-enters the second compressor (240) to continue circulating, and the secondary coolant that has been cooled down is heated to a predetermined temperature by the second electric heater (260), and then continuously circulated and transported by the circulating pump (210) to enter the superheat exchanger (130), and performs heat exchange with the high-temperature and high-pressure gas generated by compression by the first compressor (110); The refrigerant ejects high-temperature and high-pressure gas from the first compressor (110), and the oil and gas are separated by the oil separator (120). The oil flows back to the first compressor (110) through the branch, and the high-temperature gas enters the superheat heat exchanger (130) to exchange with the coolant that has reached a preset temperature. The coolant after the exchange re-enters the auxiliary heat exchanger (220) to continue to exchange with the refrigerant that has been cooled by the condenser (250), and then re-enters the superheat heat exchanger (130) to exchange heat with the subsequent refrigerant cycle. The refrigerant that has reached the preset temperature after exchanging with the coolant is heated by the heating pipeline (140) to heat the battery pack (H). After the battery pack (H) is heated, the refrigerant is heated by the first electric heater (180) and then re-enters the first compressor (110) to complete the next cycle of heating.

2. A new energy power battery low temperature test heating control device according to claim 1, characterized in that: The power battery heating system (100) comprises a first compressor (110) and an oil separator (120) connected to an exhaust end of the first compressor (110) to separate oil and gas, and to return the separated oil to the compressor (110) through a branch line.

3. A new energy power battery low temperature test heating control device according to claim 2, characterized in that: The power battery heating system (100) further comprises an overheat heat exchanger (130) whose refrigerant inlet is connected to the exhaust end of the oil separator (120), a heating pipeline (140) whose inlet is connected to the refrigerant outlet of the overheat heat exchanger (130) and heats the battery pack (H), and a first pipeline collection control unit (150) arranged on the heating pipeline (140) at the inlet side of the battery pack (H) and a second pipeline collection control unit (160) arranged on the heating pipeline (140) at the outlet side of the battery pack (H); The outlet of the heating pipeline (140) is connected to the inlet of the first compressor (110).

4. A new energy power battery low temperature test heating control device according to claim 3, characterized in that: The first pipeline collection control unit (150) comprises a battery pack inlet valve (150a) arranged on the heating pipeline (140) at the inlet side of the battery pack (H), a battery pack inlet pressure sensor (150b) and a battery pack inlet temperature sensor (150c).

5. A new energy power battery low temperature test heating control device according to claim 3, characterized in that: The second pipeline collection control unit (160) comprises a battery pack outlet valve (160a) arranged on the heating pipeline (140) at the outlet side of the battery pack (H), a battery pack outlet pressure sensor (160b) and a battery pack inlet and outlet temperature sensor (160c).

6. A new energy power battery low temperature test heating control device according to claim 3, characterized in that: The power battery heating system (100) further comprises a flow meter (170) and a first electric heater (180) arranged on the pipeline between the first compressor (110) and the second pipeline collection control unit (160).

7. An operating method of the new energy power battery low temperature test heating control device according to any one of claims 1 to 6, characterized in that: The specific steps are as follows: S1. The refrigerant in the heat exchange and temperature control system (200) first ejects high-temperature and high-pressure gas from the second compressor (240), cools down through the condenser (250), and then enters the auxiliary heat exchanger (220), performs heat exchange with the secondary coolant that has passed through the auxiliary heat exchanger (220), cools down the secondary coolant, and the refrigerant that has exchanged heat with the secondary coolant re-enters the second compressor (240) to continue circulating, and the secondary coolant that has been cooled down is heated to a predetermined temperature by the second electric heater (260), and then continuously circulated and transported by the circulating pump (210) to enter the superheat exchanger (130), and performs heat exchange with the high-temperature and high-pressure gas generated by compression by the first compressor (110); S2, the refrigerant ejects high-temperature and high-pressure gas from the first compressor (110), passes through the oil separator (120) to achieve oil and gas separation, the oil flows back to the first compressor (110) through the branch, and the high-temperature gas enters the superheat heat exchanger (130) to exchange with the coolant that has reached a preset temperature. The coolant after the exchange re-enters the auxiliary heat exchanger (220) to continue to exchange with the refrigerant that has been cooled by the condenser (250), and then re-enters the superheat heat exchanger (130) to exchange heat with the subsequent refrigerant cycle. The refrigerant that has reached the preset temperature after exchanging with the coolant is heated by the heating pipeline (140) to heat the battery pack (H). After heating the battery pack (H), the refrigerant is heated by the first electric heater (180) and then re-enters the first compressor (110) to complete the next cycle of heating. S3. During the process of the power battery heating system (100) cyclically heating the battery pack (H), the control system continuously collects the inlet and outlet temperatures and pressures of the battery pack (H) through the first pipeline collection control unit (150) and the second pipeline collection control unit (160), calculates the flow through the battery pack (H) through the flow meter (170), and calculates the heat provided to the battery pack (H), and then controls the output power of the first electric heater (180), the second electric heater (260), and the second compressor (240) so that the heat provided to the battery pack (H) by the power battery heating system (100) reaches a preset temperature. degree, and in the process of heating the battery pack (H) in a cycle by the power battery heating system (100), the rate of increase of the inlet pressure of the battery pack (H) is limited by adjusting the battery pack inlet valve (150a), and according to the real-time inlet pressure of the battery pack (H), the corresponding saturation temperature T is converted, and the sum of the saturation temperature T and the set deviation value is used as the set temperature of the overheating system, so as to meet the inlet overheating requirement, and the battery pack outlet temperature is controlled by the battery pack outlet valve (160a), that is, when the outlet supercooling degree is large, the battery pack outlet valve (160a) is opened wide, and vice versa, the battery pack outlet valve (160a) is opened narrowly, so as to control the outlet supercooling degree of the battery pack (H).

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