Adjustable lithium ion battery loop thermal management test system

Abstract

The utility model relates to the technical field of thermal management test, and discloses an adjustable lithium ion battery loop thermal management test system, which comprises a cooling-water machine body, a water replenishing tank, a water inlet pipeline and a water return pipeline, a first cavity is arranged in the cooling-water machine body, and the cooling-water machine body is further provided with a refrigeration structure and a heating structure. The refrigeration structure and the heating structure are in heat conduction fit with the first cavity; a second cavity is formed in the water supplementing tank, a water supply pipe and a water drainage pipe are communicated between the water supplementing tank and the cooling-water machine body, a water pump is installed on the water supply pipe so that water can be supplied to the cooling-water machine body from the water supplementing tank, and a valve is installed on the water drainage pipe so that water can be drained to the water supplementing tank from the cooling-water machine body when the valve is opened; the water inlet pipeline is connected with the cooling-water machine body, a water inlet connector is further arranged at the end of the water inlet pipeline, and a water inlet temperature measuring element is installed on the water inlet pipeline. The water return pipeline is connected with the cooling-water machine body, a water return connector is further arranged at the end of the water return pipeline, and a water return temperature measuring element is installed on the water return pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management testing, in particular to an adjustable thermal management testing system for a lithium-ion battery circuit. Background Art

[0002] With the rapid development of new energy vehicle technology, the battery, as the power source of the vehicle, is closely related to the battery discharge efficiency, service life and safety. Therefore, the thermal management circuit test work is crucial for new energy vehicles.

[0003] The prior art discloses a thermal management performance evaluation test device for a power battery system, which specifically includes a host computer, a charge and discharge tester, an environmental chamber and a chiller. The host computer is respectively connected to the charge and discharge tester, the environmental chamber and the chiller. The environmental chamber is used to place the battery pack. A cold liquid pipeline is arranged inside the battery pack. The water inlet of the cold liquid pipeline is connected to the water outlet of the chiller through a water inlet pipeline, and the water outlet of the cold liquid pipeline is connected to the water return port of the chiller through a water return pipeline. A first pressure transmitter is arranged on the water inlet pipeline, and a second pressure transmitter is arranged on the water return pipeline. The first pressure transmitter and the second pressure transmitter are respectively connected to the host computer to realize the circulating flow between the water in the cold water tank and the cold liquid pipeline.

[0004] However, the internal circuit capacities of different specifications of battery packs are different, and the existing chiller is difficult to meet the test requirements of different specifications of samples to be tested. Moreover, the temperature changes of the inlet and outlet water between the chiller and the circuit of the sample to be tested cannot be obtained, and the accuracy and reliability of the thermal management test are poor. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is that the existing chiller is difficult to meet the test requirements of different specifications of samples to be tested, the temperature changes of the inlet and outlet water between the chiller and the circuit of the sample to be tested cannot be obtained, and the accuracy and reliability of the thermal management test are poor.

[0006] In order to solve the above technical problem, the utility model provides a technical solution of an adjustable thermal management testing system for a lithium-ion battery circuit:

[0007] The adjustable thermal management testing system for a lithium-ion battery circuit includes:

[0008] A chiller body, a first cavity is arranged inside the chiller body, and a refrigeration structure and a heating structure are further installed on the chiller body. The refrigeration structure and the heating structure are respectively in thermal conduction cooperation with the first cavity;

[0009] Make-up water tank, a second cavity is provided inside the make-up water tank, a water supply pipe and a drain pipe are connected between the make-up water tank and the chiller body, a water pump is installed on the water supply pipe to supply water from the make-up water tank to the chiller body, and a valve is installed on the drain pipe to drain water from the chiller body to the make-up water tank when opened;

[0010] Inlet pipeline, the inlet pipeline is connected to the chiller body, an inlet water interface is further provided at the end of the inlet pipeline away from the chiller body, and an inlet water temperature measuring element is installed on the inlet pipeline;

[0011] Return water pipeline, the return water pipeline is connected to the chiller body, a return water interface is further provided at the end of the return water pipeline away from the chiller body, and a return water temperature measuring element is installed on the return water pipeline.

[0012] Further, there are two inlet water temperature measuring elements, which are respectively a first inlet water temperature measuring element and a second inlet water temperature measuring element. The first inlet water temperature measuring element is arranged at the position where the inlet pipeline is close to the chiller body, and the second inlet water temperature measuring element is arranged at the position where the inlet pipeline is close to the inlet water interface.

[0013] Further, there are two return water temperature measuring elements, which are respectively a first return water temperature measuring element and a second return water temperature measuring element. The first return water temperature measuring element is arranged at the position where the return water pipeline is close to the chiller body, and the second return water temperature measuring element is arranged at the position where the return water pipeline is close to the return water interface.

[0014] Further, a liquid level detection element is further provided inside the chiller body, and the liquid level detection element is used to detect the volume of the heat exchange liquid in the first cavity.

[0015] Further, it further includes a main controller, and the main controller is electrically connected to the water pump, the valve, and the liquid level detection element respectively to control the test loop capacity V0 between the chiller body and the sample to be tested to be equal to the actual loop capacity Vs of the vehicle battery pack during the test.

[0016] Further, the volume of the heat exchange liquid in the first cavity is V1, the sum of the capacities of the inlet pipeline and the return water pipeline is V2, the internal capacity of the sample to be tested is V3, and the test loop capacity V0 between the chiller body and the sample to be tested = V1 + V2 + V3.

[0017] Further, the main controller is also electrically connected to the refrigeration structure, the heating structure, the inlet water temperature measuring element, and the return water temperature measuring element respectively to detect the power of the chiller body or the heat exchange power inside the sample to be tested during the test.

[0018] Further, the refrigeration structure is a heat pump refrigeration structure or a thermoelectric cooling element.

[0019] Further, the heating structure is a PTC heating element or an electric heating wire structure.

[0020] Further, the valve is a solenoid valve or an electric valve.

[0021] Compared with the prior art, the adjustable lithium-ion battery circuit thermal management test system of the present utility model has the following beneficial effects: The adjustable lithium-ion battery circuit thermal management test system adopts the design form of a chiller body, a water replenishing tank, a water inlet pipeline and a water return pipeline. A first cavity is provided inside the chiller body. The chiller body is equipped with a refrigeration structure and a heating structure. The first cavity of the chiller body can be used to accommodate the heat exchange liquid. Through the refrigeration structure and the heating structure, the heat exchange liquid can be cooled and heated, so that after the heat exchange liquid reaches the set temperature, it is input into the interior of the sample to be tested, thereby realizing the purpose of simulating and testing the thermal management of the vehicle battery pack.

[0022] Among them, a second cavity is provided inside the water replenishing tank. A water supply pipe and a drain pipe are connected between the water replenishing tank and the chiller body. A water pump is installed on the water supply pipe, and a valve is installed on the drain pipe. During the test, if the test loop capacity V0 between the chiller body and the sample to be tested is less than the actual loop capacity Vs of the vehicle battery pack, the water pump can be started to supply water from the water replenishing tank to the chiller body; if the test loop capacity V0 between the chiller body and the sample to be tested is greater than the actual loop capacity Vs of the vehicle battery pack, the valve can be started to drain water from the chiller body to the water replenishing tank to ensure that the test loop capacity is equal to the actual loop capacity of the vehicle battery pack, and it can meet the test requirements of different specifications of samples to be tested.

[0023] In addition, the water inlet pipeline is connected to the chiller body, and a water inlet temperature measuring element is installed on the water inlet pipeline; the water return pipeline is connected to the chiller body, and a water return temperature measuring element is installed on the water return pipeline. By using the water inlet interface of the water inlet pipeline and the water return interface of the water return pipeline to be connected to the sample to be tested respectively, the heat exchange liquid in the chiller body can flow into the interior of the sample to be tested through the water inlet pipeline, and then circulate back to the chiller body through the water return pipeline, forming a test loop between the chiller body and the sample to be tested.

[0024] The water inlet temperature of the heat exchange liquid can be detected through the water inlet temperature measuring element, and the water return temperature of the heat exchange liquid can be detected through the water return temperature measuring element. The temperature changes of the water inlet temperature and the water return temperature can be obtained, and combined with the test loop capacity, the power of the chiller body and the heat exchange power inside the sample to be tested can be accurately obtained, thereby ensuring the accuracy and reliability of the test thermal management. Description of the Drawings

[0025] Figure 1It is a schematic structural diagram of an adjustable lithium-ion battery circuit thermal management test system in an embodiment of the present utility model;

[0026] Figure 2 It is a schematic control principle diagram of an adjustable lithium-ion battery circuit thermal management test system in an embodiment of the present utility model;

[0027] In the figure: 1 - chiller body, 10 - first cavity, 11 - refrigeration structure, 12 - heating structure, 13 - liquid level detection element, 2 - water replenishing tank, 20 - second cavity, 21 - water supply pipe, 22 - drain pipe, 23 - water pump, 24 - valve, 3 - water inlet pipeline, 30 - water inlet interface, 31 - water inlet temperature measuring element, 32 - first water inlet temperature measuring element, 33 - second water inlet temperature measuring element, 4 - water return pipeline, 40 - water return interface, 41 - water return temperature measuring element, 42 - first water return temperature measuring element, 43 - second water return temperature measuring element, 5 - sample to be tested, 6 - main controller. Specific embodiments

[0028] The following combines the accompanying drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. in the present utility model is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0031] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] As Figure 1 , Figure 2 shown, an adjustable lithium-ion battery circuit thermal management test system according to an embodiment of the present utility model includes: a chiller body 1, a water replenishing tank 2, a water inlet pipeline 3, and a water return pipeline 4. A first cavity 10 is provided inside the chiller body 1. The chiller body 1 is further equipped with a refrigeration structure 11 and a heating structure 12, and the refrigeration structure 11 and the heating structure 12 are respectively in heat conduction cooperation with the first cavity 10; a second cavity 20 is provided inside the water replenishing tank 2, and a water supply pipe 21 and a drain pipe 22 are connected between the water replenishing tank 2 and the chiller body 1.

[0033] A water pump 23 is installed on the water supply pipe 21 to supply water from the water replenishing tank 2 to the chiller body 1, and a valve 24 is installed on the drain pipe 22 to drain water from the chiller body 1 to the water replenishing tank 2 when it is opened. The water inlet pipeline 3 is connected to the chiller body 1, and a water inlet interface 30 is further provided at the end of the water inlet pipeline 3 away from the chiller body 1, and a water inlet temperature measuring element 31 is installed on the water inlet pipeline 3; the water return pipeline 4 is connected to the chiller body 1, and a water return interface 40 is further provided at the end of the water return pipeline 4 away from the chiller body 1, and a water return temperature measuring element 41 is installed on the water return pipeline 4.

[0034] The adjustable lithium-ion battery circuit thermal management test system adopts the design form of the chiller body 1, the water replenishing tank 2, the water inlet pipeline 3, and the water return pipeline 4. A first cavity 10 is provided inside the chiller body 1. The chiller body 1 is equipped with a refrigeration structure 11 and a heating structure 12. The first cavity 10 of the chiller body 1 can be used to accommodate a heat exchange liquid. The heat exchange liquid can be cooled and heated by the refrigeration structure 11 and the heating structure 12, and after the heat exchange liquid reaches a set temperature, it is input into the interior of a sample to be tested 5, thereby achieving the purpose of simulating and testing the thermal management of a vehicle battery pack.

[0035] Among them, a second cavity 20 is provided inside the makeup water tank 2. A water supply pipe 21 and a drain pipe 22 are connected between the makeup water tank 2 and the chiller body 1. A water pump 23 is installed on the water supply pipe 21, and a valve 24 is installed on the drain pipe 22. During testing, if the test loop capacity V0 between the chiller body 1 and the sample to be tested 5 is less than the actual loop capacity Vs of the vehicle battery pack, the water pump 23 can be started to supply water from the makeup water tank 2 to the chiller body 1; if the test loop capacity V0 between the chiller body 1 and the sample to be tested 5 is greater than the actual loop capacity Vs of the vehicle battery pack, the valve 24 can be started to drain water from the chiller body 1 to the makeup water tank 2 to ensure that the test loop capacity V0 is equal to the actual loop capacity Vs of the vehicle battery pack, which can meet the test requirements of different specifications of the sample to be tested 5.

[0036] In addition, the water inlet pipe 3 is connected to the chiller body 1, and a water inlet temperature measuring element 31 is installed on the water inlet pipe 3; the water return pipe 4 is connected to the chiller body 1, and a water return temperature measuring element 41 is installed on the water return pipe 4. By using the water inlet interface 30 of the water inlet pipe 3 and the water return interface 40 of the water return pipe 4 to be respectively connected to the sample to be tested 5, the heat exchange fluid in the chiller body 1 can flow into the interior of the sample to be tested 5 through the water inlet pipe 3, and then circulate back to the chiller body 1 through the water return pipe 4, forming a test loop between the chiller body 1 and the sample to be tested 5.

[0037] The water inlet temperature of the heat exchange fluid can be detected by the water inlet temperature measuring element 31, and the water return temperature of the heat exchange fluid can be detected by the water return temperature measuring element 41. The temperature changes of the water inlet temperature and the water return temperature can be obtained, and combined with the test loop capacity, the power of the chiller body 1 and the heat exchange power inside the sample to be tested 5 can be accurately obtained, thus ensuring the accuracy and reliability of the test thermal management.

[0038] In this embodiment, there are two water inlet temperature measuring elements 31, which are respectively the first water inlet temperature measuring element 32 and the second water inlet temperature measuring element 33. The first water inlet temperature measuring element 32 is arranged near the chiller body 1 on the water inlet pipe 3, and the second water inlet temperature measuring element 33 is arranged near the water inlet interface 30 on the water inlet pipe 3. And there are two water return temperature measuring elements 41, which are respectively the first water return temperature measuring element 42 and the second water return temperature measuring element 43. The first water return temperature measuring element 42 is arranged near the chiller body 1 on the water return pipe 4, and the second water return temperature measuring element 43 is arranged near the water return interface 40 on the water return pipe 4.

[0039] The heat loss that occurs when the heat exchange liquid passes through the water inlet pipe 3 can be effectively calculated through the first water inlet temperature measuring element 32 and the second water inlet temperature measuring element 33, and the heat loss that occurs when the heat exchange liquid passes through the water return pipe 4 can be effectively calculated through the first water return temperature measuring element 42 and the second water return temperature measuring element 43. The combination of the first water inlet temperature measuring element 32 and the first water return temperature measuring element 42 can accurately obtain the refrigeration and heating power of the chiller body 1, and the combination of the second water inlet temperature measuring element 33 and the second water return temperature measuring element 43 can accurately obtain the heat exchange power inside the sample to be tested 5. It should be noted that the thermal power P = Cp * r * v * ΔT, where Cp is the specific heat capacity of the heat exchange liquid (kJ / kg / °C), r is the specific weight (kg / m 3 ), v is the flow rate (m 3 / sec). When the temperature difference ΔT is fixed and the flow rate v is fixed, the refrigeration and heating power of the chiller body 1 and the heat exchange power inside the sample to be tested 5 can be calculated.

[0040] As a further preferred solution, a liquid level detection element 13 is also provided inside the chiller body 1. The liquid level detection element 13 is used to detect the volume of the heat exchange liquid in the first cavity 10. The liquid level detection element 13 detects the volume of the heat exchange liquid in the first cavity 10 in real time to ensure that the corresponding volume of the heat exchange liquid can be accurately replenished into the first cavity 10 or discharged from the first cavity 10.

[0041] In this embodiment, the adjustable lithium-ion battery loop thermal management test system further includes a main controller 6. The main controller 6 is electrically connected to the water pump 23, the valve 24, and the liquid level detection element 13 respectively to control the test loop capacity V0 between the chiller body 1 and the sample to be tested 5 to be equal to the actual loop capacity Vs of the vehicle battery pack during the test. Specifically, the volume of the heat exchange liquid in the first cavity 10 is V1, the sum of the capacities of the water inlet pipe 3 and the water return pipe 4 is V2, and the internal capacity of the sample to be tested 5 is V3. The test loop capacity V0 between the chiller body 1 and the sample to be tested 5 is V0 = V1 + V2 + V3. As Figure 2 shown, among them, the sum of the capacities of the water inlet pipe 3 and the water return pipe 4 is V2, the internal capacity of the sample to be tested 5 is V3, and the actual loop capacity Vs of the vehicle battery pack are all known quantities. The main controller 6 can calculate the required volume of the heat exchange liquid in the first cavity 10 as V1 based on these three quantities, and control the opening and closing of the water pump 23 or the solenoid valve 24 until the test loop capacity V0 is equal to the actual loop capacity Vs of the vehicle battery pack.

[0042] In addition, the main controller 6 is also electrically connected to the refrigeration structure 11, the heating structure 12, the inlet water temperature measuring element 31, and the return water temperature measuring element 41 respectively, so as to detect the power of the chiller body 1 or the heat exchange power inside the sample to be tested 5 during the test. As a further preferred solution, the refrigeration structure 11 is a heat pump refrigeration structure or a semiconductor refrigeration element, the heating structure 12 is a PTC heating element or an electric heating wire structure, with higher refrigeration and heating efficiency, and the valve 24 is a solenoid valve or an electric valve, which is convenient for accurately controlling the water replenishment and drainage processes.

[0043] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An adjustable thermal management test system for a lithium-ion battery circuit, characterized in that, Including: A chiller body (1), inside which there is a first cavity (10). The chiller body (1) is also equipped with a refrigeration structure (11) and a heating structure (12), and the refrigeration structure (11) and the heating structure (12) are respectively in heat conduction cooperation with the first cavity (10); A water replenishing tank (2), inside which there is a second cavity (20). A water supply pipe (21) and a drain pipe (22) are connected between the water replenishing tank (2) and the chiller body (1). A water pump (23) is installed on the water supply pipe (21) to supply water from the water replenishing tank (2) to the chiller body (1), and a valve (24) is installed on the drain pipe (22) to drain water from the chiller body (1) to the water replenishing tank (2) when it is opened; An inlet pipeline (3) is connected to the chiller body (1). The end of the inlet pipeline (3) far from the chiller body (1) is also provided with an inlet interface (30), and an inlet temperature measuring element (31) is installed on the inlet pipeline (3); A return pipeline (4) is connected to the chiller body (1). The end of the return pipeline (4) far from the chiller body (1) is also provided with a return water interface (40), and a return water temperature measuring element (41) is installed on the return pipeline (4).

2. The adjustable lithium-ion battery circuit thermal management test system according to claim 1, wherein There are two inlet temperature measuring elements (31), which are respectively a first inlet temperature measuring element (32) and a second inlet temperature measuring element (33). The first inlet temperature measuring element (32) is arranged at a position on the inlet pipeline (3) close to the chiller body (1), and the second inlet temperature measuring element (33) is arranged at a position on the inlet pipeline (3) close to the inlet interface (30).

3. The adjustable lithium-ion battery circuit thermal management test system according to claim 1, characterized in that, There are two return water temperature measuring elements (41), which are respectively a first return water temperature measuring element (42) and a second return water temperature measuring element (43). The first return water temperature measuring element (42) is arranged at a position on the return pipeline (4) close to the chiller body (1), and the second return water temperature measuring element (43) is arranged at a position on the return pipeline (4) close to the return water interface (40).

4. The adjustable lithium-ion battery circuit thermal management test system according to claim 1, characterized in that, A liquid level detection element (13) is also arranged inside the chiller body (1), and the liquid level detection element (13) is used to detect the volume of the heat exchange liquid in the first cavity (10).

5. The adjustable lithium-ion battery circuit thermal management test system according to claim 4, characterized in that, It also includes a main controller (6), and the main controller (6) is electrically connected to the water pump (23), the valve (24), and the liquid level detection element (13) respectively to control the test loop capacity V0 between the chiller body (1) and the sample to be tested (5) to be equal to the actual loop capacity Vs of the vehicle battery pack during the test.

6. The adjustable lithium-ion battery circuit thermal management test system according to claim 5, wherein, The volume of the heat exchange liquid in the first cavity (10) is V1, the sum of the capacities of the inlet pipeline (3) and the return pipeline (4) is V2, the internal capacity of the sample to be tested (5) is V3, and the test loop capacity V0 between the chiller body (1) and the sample to be tested (5) = V1 + V2 + V3.

7. The adjustable lithium-ion battery circuit thermal management test system according to claim 5, characterized in that, The main controller (6) is also electrically connected to the refrigeration structure (11), the heating structure (12), the water inlet temperature measuring element (31), and the return water temperature measuring element (41) respectively, so as to detect the power of the chiller body (1) or the heat exchange power inside the sample to be tested (5) during the test.

8. The adjustable lithium-ion battery circuit thermal management test system according to claim 1, characterized in that, The refrigeration structure (11) is a heat pump refrigeration structure or a semiconductor refrigeration element.

9. The adjustable lithium-ion battery circuit thermal management test system according to claim 1, characterized in that, The heating structure (12) is a PTC heating element or an electric heating wire structure.

10. The adjustable lithium-ion battery circuit thermal management test system according to claim 1, characterized in that, The valve (24) is a solenoid valve or an electric valve.

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