Air-cooling power test method for battery

Abstract

The application relates to the technical field of battery development and testing, in particular to a battery air-cooling power testing method. The battery air-cooling power testing method comprises the following steps: selecting a battery and an air-cooling device, assembling the battery and the air-cooling device, and placing the battery in a constant-temperature environment; continuously heating the battery at a predetermined heating power P0, and synchronously air-cooling the battery through the air-cooling device; until the surface temperature of the battery is stabilized at a first temperature T1, the temperature of the constant-temperature environment is a second temperature T2, and the predetermined temperature difference AT is calculated, wherein AT = T1-T2; determining the air-cooling power P1 of the air-cooling device on the battery according to the predetermined temperature difference AT, wherein P1 = 0.62*T-0.73, the unit of AT is DEG C, and the unit of P1 is W. The battery air-cooling power testing method simplifies the difficulty of battery air-cooling power testing.

Description

Technical Field

[0001] This application relates to the field of battery development and testing technology, and in particular to a method for testing the air-cooled power of a battery. Background Technology

[0002] With the increasing application of power batteries and the growing demands on their energy density and power, the requirements for the structure and cooling strategy of battery module cooling systems are also increasing.

[0003] Furthermore, during the battery development phase, it is crucial to simulate the actual cooling conditions of the battery module as closely as possible, as this is necessary to more accurately evaluate battery performance.

[0004] Currently, there are two main battery cooling solutions: air cooling and water cooling. Among them, water cooling can provide greater cooling power and is suitable for cooling prismatic battery modules.

[0005] For cylindrical battery modules, due to the large number of batteries, small size, and small capacity within the module, the cooling power allocated to each cylindrical cell is smaller than that of a square cell, even with the same overall cooling power for the battery module. Therefore, they are more suitable for cooling using a lower-power air-cooling solution.

[0006] Air-cooled devices have the advantages of small size and cooling power that is closer to the actual situation. However, the cooling power of air-cooled devices is greatly affected by the specifications, operating status and environmental characteristics of the tested battery. Since the real-time air-cooling power cannot be accurately and directly measured, and the air-cooling power test conditions of batteries and battery modules are different, it is not yet possible to directly measure the cooling power of the battery, and it is not possible to extrapolate the cooling power of the battery based on the cooling power of the battery module. Summary of the Invention

[0007] The purpose of this application is to provide a method for testing the air-cooling power of a battery, so as to solve to some extent the technical problems in the prior art that the cooling power of the battery cannot be directly measured and the cooling power of the battery cannot be calculated based on the cooling power of the battery module.

[0008] This application provides a method for testing the air-cooled power of a battery, including the following steps:

[0009] Select the battery and air-cooling device, assemble the battery and air-cooling device, and place the battery in a constant temperature environment;

[0010] The battery is continuously heated with a predetermined heating power P0, and simultaneously cooled by a wind-cooling device.

[0011] Until the surface temperature of a single cell stabilizes at the first temperature T1, and the temperature of the constant temperature environment is the second temperature T2, calculate the predetermined temperature difference ΔT, where ΔT = T1 - T2;

[0012] The air cooling power P1 of the air cooling device for the battery is determined based on the predetermined temperature difference ΔT, where P1 = 0.62 * ΔT - 0.73, ΔT is in °C, and P1 is in W.

[0013] In the above technical solution, the step of determining the air-cooling power P1 of the air-cooling device for the battery based on the predetermined temperature difference ΔT, wherein P1 = 0.62 * ΔT - 0.73, specifically includes the following steps:

[0014] Under the same constant temperature environment and different predetermined heating powers P0, the corresponding ΔT is measured and the corresponding air cooling power P1 is determined, wherein the air cooling power P1 of the air cooling device for the battery is equal to the predetermined heating power P0.

[0015] In the coordinate system, (ΔT, P1) is calibrated for different predetermined heating powers P0.

[0016] Based on the calibrated multiple (ΔT, P1), the linear variation law of P1 with respect to ΔT is obtained through linear fitting as P1 = 0.62 * ΔT - 0.73;

[0017] The air cooling power P1 of the air cooling device for the battery is determined based on the predetermined temperature difference ΔT, where P1 = 0.62 * ΔT - 0.73, ΔT is in °C, and P1 is in W.

[0018] In any of the above technical solutions, at least three different predetermined heating powers P0 (ΔT, P1) are further specified in the coordinate system.

[0019] In any of the above technical solutions, the air-cooled power testing method for the battery further includes the following steps:

[0020] Select the target predetermined air-cooling power P1' and calculate the target predetermined temperature difference ΔT' corresponding to the target predetermined air-cooling power P1';

[0021] Stop the continuous heating of the battery, so that the battery can work in a constant temperature environment under predetermined current conditions, and the battery can be cooled synchronously by air cooling device;

[0022] Adjust the initial settings of the constant temperature environment until the actual predetermined temperature equals the target predetermined temperature difference ΔT', and use the current initial settings of the constant temperature environment as the target initial settings.

[0023] In any of the above technical solutions, the step of continuously heating the battery with a predetermined heating power and simultaneously cooling the battery with a wind-cooling device specifically includes the following steps:

[0024] A resistance wire is wound around the outside of the battery and connected to the power supply device.

[0025] Power is supplied to the resistance wire by a power supply device, and the power supply power of the power supply device is set to a predetermined heating power so that the resistance wire continuously heats the battery at the predetermined heating power.

[0026] The battery is simultaneously cooled by an air-cooling device.

[0027] In any of the above technical solutions, the resistance wire is further defined as a resistance wire with a constant resistance value.

[0028] The power supply device is a constant voltage and constant current power supply device. The power supply current of the power supply device is I, the power supply voltage of the power supply device is U, and the predetermined heating power is P0=U*I.

[0029] In any of the above technical solutions, after the first insulating protective layer is wound around the outside of the battery, a resistance wire is wound around the outside of the first insulating protective layer, and then a second insulating protective layer is wound around the outside of the resistance wire.

[0030] In any of the above technical solutions, the step of selecting the battery and the air-cooling device, assembling the battery with the air-cooling device, and placing the battery in a constant temperature environment specifically includes the following steps:

[0031] Select the battery and air-cooling device, and install a temperature measuring device on the surface of the battery to detect the surface temperature of the battery.

[0032] The battery is assembled with an air-cooling device and placed in a constant temperature environment.

[0033] In any of the above technical solutions, the step of selecting the battery and the air-cooling device, assembling the battery with the air-cooling device, and placing the battery in a constant temperature environment specifically includes the following steps:

[0034] Select the battery and the air-cooling device, the air-cooling device including the connected heat-conducting part and heat-dissipating part;

[0035] The battery is attached to the heat-conducting part to assemble the battery with the air-cooling device, and the battery is placed in a constant temperature environment.

[0036] In any of the above technical solutions, the air-cooling device is further described as a copper heat sink, an aluminum heat sink, or a semiconductor cooling chip.

[0037] Compared with the prior art, the beneficial effects of this application are as follows:

[0038] The air-cooling power testing method for batteries provided in this application calculates the air-cooling power P1 of the air-cooling device for the battery in real time by measuring a predetermined temperature difference ΔT between the battery surface temperature T1 and the ambient temperature T2 when the battery is in temperature equilibrium. Here, P1 = 0.62 * ΔT - 0.73, ΔT is in °C, and P1 is in W. In other words, this battery air-cooling power testing method avoids the limitation of not being able to directly measure air-cooling power. By measuring the predetermined temperature difference ΔT, the air-cooling power of the battery can be determined. Since temperature measurement is relatively easy to implement, this simplifies the difficulty of testing the battery's air-cooling power.

[0039] Furthermore, the battery's first temperature T1 changes when tested under different current conditions. By adjusting the initial temperature parameters of the constant-temperature environment in which the battery is located, the second temperature T2 of the constant-temperature environment can be adjusted. Thus, the predetermined temperature difference ΔT can be adjusted to be the same when the battery is operating under different current conditions. Based on this, since the predetermined temperature difference ΔT corresponds one-to-one with the air-cooling power P1, the same air-cooling device can achieve the same air-cooling power when the battery is tested under different current conditions. Therefore, the same air-cooling device can be applied to the performance testing of more batteries, which is beneficial for cost savings. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 A schematic diagram illustrating the test principle of the air-cooled power testing method for batteries provided in this application embodiment;

[0042] Figure 2 A calibration schematic diagram of the air-cooled power testing method for batteries provided in this application embodiment;

[0043] Figure 3 The temperature change curve of the battery provided in this application embodiment during continuous pulse testing.

[0044] Figure label:

[0045] 1-Battery; 2-Resistance wire; 3-Power supply device; 4-Air cooling device; 40-Heat-conducting part; 41-Heat dissipation part; 5-Temperature measuring device. Detailed Implementation

[0046] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] Example 1

[0050] See Figures 1 to 3 As shown, an embodiment of this application provides a method for testing the air-cooling power of a battery 1, which is used to test the air-cooling power of the air-cooling device 4 for a single battery 1.

[0051] The air-cooled power testing method for battery 1 provided in this embodiment includes the following steps:

[0052] Step S100: Select battery 1 and air-cooling device 4, assemble battery 1 and air-cooling device 4 together, and place battery 1 in a constant temperature environment.

[0053] Step S110: The battery 1 is continuously heated with a predetermined heating power P0, and the battery 1 is simultaneously cooled by the air cooling device 4.

[0054] Step S120: until the surface temperature of a single cell stabilizes at the first temperature T1 and the temperature of the constant temperature environment is the second temperature T2, calculate the predetermined temperature difference ΔT, where ΔT = T1 - T2.

[0055] Step S130: Determine the air cooling power P1 of the air cooling device 4 for the battery 1 based on the predetermined temperature difference ΔT, where P1 = 0.62 * ΔT - 0.73, ΔT is in °C, and P1 is in W.

[0056] In this technical solution, in step S100, the constant temperature environment can be achieved by constant temperature equipment such as a constant temperature chamber or a constant temperature cabinet. By adjusting the initial setting conditions of the constant temperature equipment, the initial constant temperature of the constant temperature environment can be adjusted.

[0057] In step S110, the battery 1 is continuously heated with a predetermined heating power P0 to simulate the temperature rise phenomenon generated by the battery 1 during charging and discharging. The battery 1 is then cooled by the air cooling device 4 to simulate the air cooling treatment performed by a specific air cooling device 4 on the battery 1 during charging and discharging.

[0058] In step S120, after a certain period of heating and air cooling, the surface temperature of battery 1 changes and stabilizes at a first temperature T1, while the constant temperature environment is maintained at a second temperature T2, so that the entire system reaches a temperature equilibrium state, and the difference between the surface temperature of battery 1 and the temperature of the constant temperature environment also stabilizes at a predetermined temperature difference ΔT.

[0059] In step 130, the air-cooling power test method of the battery 1 finds the relationship between the air-cooling power P1 of the air-cooling device 4 for the battery 1 and the predetermined temperature difference ΔT, so that the air-cooling power P1 can be obtained by measuring the predetermined temperature difference ΔT.

[0060] The air-cooling power testing method for battery 1 can be used to determine the air-cooling power of the air-cooling device 4 used in the current performance test when performing various performance tests on battery 1. In a specific example, battery 1 is subjected to a continuous pulse test with a charging current of 54A and a discharging current of 30A and a root mean square current of 40A. Figure 3 The curves showing the changes of the first temperature T1 and the second temperature T2 obtained during the test as the output energy of battery 1 increases are shown. It can be seen that the predetermined temperature difference ΔT is stable at 20℃. Therefore, the air cooling power P1 of the air cooling device 4 for battery 1 during the current continuous pulse test can be directly calculated as follows: P1 = 0.62 * ΔT - 0.73 = 0.62 * 20 - 0.73 = 11.67W.

[0061] In the optional embodiment, step S130 specifically includes the following steps:

[0062] Step S131: Under the same constant temperature environment and different predetermined heating powers P0, measure the corresponding ΔT and determine the corresponding air cooling power P1, wherein the air cooling power P1 of the air cooling device 4 for the battery 1 is equal to the predetermined heating power P0.

[0063] Step S132: In the coordinate system, calibrate (ΔT, P1) under different predetermined heating powers P0.

[0064] Step S133: Based on the calibrated multiple (ΔT, P1), the linear variation law of P1 with respect to ΔT is obtained by linear fitting as P1 = 0.62 * ΔT - 0.73;

[0065] Step S134: Determine the air cooling power P1 of the air cooling device 4 for the battery 1 according to the predetermined temperature difference ΔT, where P1 = 0.62 * ΔT - 0.73, ΔT is in °C, and P1 is in W.

[0066] In this technical solution, such as Figure 2 As shown in the table, there are eight rows of data. The first column of each row is the predetermined heating power P0, which, according to step S131, is also the air cooling power P1. The second column of each row is the first temperature T1, the third column is the second temperature T2, and the fourth column is the predetermined temperature difference ΔT. Thus, under the same constant temperature environment and eight different predetermined heating powers P0, eight different fitting points (ΔT, P1) can be calibrated. Based on the eight calibrated fitting points (ΔT, P1), linear fitting can be performed to obtain P1 = 0.62 * ΔT - 0.73. This determination of the air cooling power P1 of the air cooling device 4 for the battery 1 based on the predetermined temperature difference ΔT can be applied in the actual air cooling power determination process.

[0067] In this embodiment, as Figure 2 As shown, the case of calibrating (ΔT, P1) under eight different predetermined heating powers P0 for linear fitting is illustrated. In the actual measurement process, the number of fitting points can be adjusted according to actual needs. However, in order to ensure fitting accuracy, the number of fitting points should be at least three. That is, at least three different predetermined heating powers P0 (ΔT, P1) should be calibrated in the coordinate system for linear fitting.

[0068] In the optional embodiment, the air-cooled power testing method for battery 1 includes the following steps:

[0069] Step S200: Select battery 1 and air-cooling device 4, assemble battery 1 and air-cooling device 4 together, and place battery 1 in a constant temperature environment.

[0070] Step S210: The battery 1 is continuously heated with a predetermined heating power P0, and the battery 1 is simultaneously cooled by the air cooling device 4.

[0071] Step S220: until the surface temperature of a single cell stabilizes at the first temperature T1 and the constant temperature environment is at the second temperature T2, calculate the predetermined temperature difference ΔT, where ΔT = T1 - T2.

[0072] Step S230: Determine the air cooling power P1 of the air cooling device 4 for the battery 1 according to the predetermined temperature difference ΔT, where P1 = 0.62 * ΔT - 0.73, ΔT is in °C, and P1 is in W.

[0073] Step S240: Select the target predetermined air-cooling power P1' and calculate the target predetermined temperature difference ΔT' corresponding to the target predetermined air-cooling power P1';

[0074] Step S250: Stop the continuous heating of battery 1, so that battery 1 can work in a constant temperature environment under a predetermined current condition, and perform synchronous air cooling on battery 1 through air cooling device 4.

[0075] Step S260: Adjust the initial setting conditions of the constant temperature environment until the actual predetermined temperature difference equals the target predetermined temperature difference ΔT', and take the initial setting conditions of the constant temperature environment corresponding to the target predetermined temperature difference ΔT' as the target initial setting conditions.

[0076] In steps S240 to S260, the battery 1 is air-cooled by the same air-cooling device 4 with the same air-cooling power when the battery 1 is tested under different predetermined current conditions.

[0077] For example, when battery 1 is operating under the first predetermined current condition in the cycle state, after adjusting the initial setting conditions of the constant temperature environment, the second temperature T2 of the constant temperature environment can ensure that the actual predetermined temperature difference is stable at the target predetermined temperature difference ΔT'. Then, when battery 1 is operating under the first predetermined current condition in the constant temperature environment, the air cooling device 4 can perform air cooling on battery 1 with a predetermined air cooling power P1'.

[0078] When battery 1 operates at the second predetermined current condition under the high-rate state, the initial setting conditions of the constant temperature environment are adjusted accordingly so that the second temperature T2 of the constant temperature environment can ensure that the actual predetermined temperature difference is stable at the target predetermined temperature difference ΔT'. Then, when battery 1 operates in the adjusted constant temperature environment under the second predetermined current condition, the air-cooling device 4 can air-cool battery 1 with a predetermined air-cooling power P1'.

[0079] In other words, the second temperature T2 under the rate-controlled state and the cycle state are not equal, but the actual predetermined temperature difference under both states is stable at the target predetermined temperature difference ΔT', thus both can be air-cooled with the predetermined air-cooling power P1'. Therefore, it can be seen that by using the same air-cooling device 4 and adjusting the initial settings of the constant temperature environment by different magnitudes, the battery 1 can be air-cooled by the same air-cooling device 4 with the same air-cooling power under different current conditions.

[0080] In the optional embodiment, step S110 specifically includes the following steps:

[0081] Step S111: A resistance wire 2 is wound around the outside of the battery 1, and the resistance wire 2 is connected to the power supply device 3.

[0082] Step S112: Power is supplied to the resistance wire 2 through the power supply device 3, and the power supply power of the power supply device 3 is set to a predetermined heating power so that the resistance wire 2 continuously heats the battery 1 with the predetermined heating power.

[0083] Step S113, and synchronously air-cool the battery 1 through the air-cooling device 4.

[0084] In this technical solution, such as Figure 1 As shown, heat can be evenly dissipated on the outside of the battery 1 through the resistance wire 2, and the predetermined heating power can be adjusted by controlling the power supply power of the power supply device 3, making it easier to adjust and monitor various predetermined heating powers.

[0085] In this embodiment, in order to ensure that the battery 1 is heated with a constant predetermined heating power, the resistance wire 2 is a resistance wire with a constant resistance value, the power supply device 3 is a constant voltage and constant current power supply device 3, the power supply current of the power supply device 3 is I, the power supply voltage of the power supply device 3 is U, and the predetermined heating power P0=U*I.

[0086] In this embodiment, in step S111, during the process of winding the resistance wire 2 around the outside of the battery 1, a first insulating protective layer is first wound around the outside of the battery 1, then the resistance wire 2 is wound around the outside of the first insulating protective layer, and finally a second insulating protective layer is wound around the outside of the resistance wire 2. This effectively insulates the battery 1 and the resistance wire 2 through the first insulating protective layer, and insulates the resistance wire 2 from the outside environment through the second insulating resistance wire 2, reducing the risk of short circuits and electric shock.

[0087] In the optional embodiment, step S100 specifically includes the following steps:

[0088] Step S101: Select battery 1 and air cooling device 4, and install temperature measuring device 5 on the surface of battery 1 to detect the surface temperature of battery 1 through temperature measuring device 5.

[0089] Step S102: Assemble the battery 1 with the air-cooling device 4 and place the battery 1 in a constant temperature environment.

[0090] In this technical solution, such as Figure 1 As shown, in step S101, by installing a temperature measuring device 5 on the surface of the battery 1, the surface temperature of the battery 1 can be detected by the temperature measuring device 5. The temperature measuring device 5 is, for example, a thermocouple, and further, the temperature measuring device 5 is, for example, a T-type thermocouple.

[0091] In the optional embodiment, step S100 specifically includes the following steps:

[0092] Step S103: Select battery 1 and air-cooling device 4. Air-cooling device 4 includes a heat-conducting part 40 and a heat-dissipating part 41 connected to each other.

[0093] Step S104: The battery 1 is attached to the heat-conducting part 40 so that the battery 1 is assembled with the air-cooling device 4, and the battery 1 is placed in a constant temperature environment.

[0094] In this technical solution, such as Figure 1 As shown, the heat-conducting part 40 of the air-cooling device 4 can be configured as a component with a high thermal conductivity that can make large-area contact with the battery 1, such as a heat-conducting plate. The heat dissipation part 41 of the air-cooling device 4 can be configured as a component with strong heat dissipation capacity and connected to the heat-conducting part 40, such as a heat sink. Thus, the heat-conducting part 40 efficiently absorbs heat from the battery 1 and transfers the absorbed heat to the heat dissipation part 41. Then, the heat dissipation part 41 is cooled by the flowing gas to achieve air cooling of the battery 1.

[0095] Specifically, both the air-cooling device 4 and the battery 1 can be placed in a constant temperature environment.

[0096] In the optional embodiments of this example, the air-cooling device 4 can be a copper heat sink, an aluminum heat sink, or a semiconductor cooling chip. All of the above air-cooling devices 4 have the characteristic that the air-cooling power is affected by the ambient temperature.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features of different embodiments are meant to be within the scope of the present invention and form different embodiments. For example, any one of the claimed embodiments can be used in any combination. The information disclosed in this background section is only intended to enhance the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A method for testing the air-cooled power of a battery, characterized in that, Includes the following steps: Select the battery and air-cooling device, assemble the battery and air-cooling device, and place the battery in a constant temperature environment; The battery is continuously heated with a predetermined heating power P0, and simultaneously cooled by a wind-cooling device. Until the surface temperature of the battery stabilizes at the first temperature T1 and the temperature of the constant temperature environment is the second temperature T2, calculate the predetermined temperature difference ΔT, where ΔT = T1 - T2; The air cooling power P1 of the air cooling device for the battery is determined based on the predetermined temperature difference ΔT, where P1 = 0.62 * ΔT - 0.73, ΔT is in °C, and P1 is in W.

2. The method for testing the air-cooled power of a battery according to claim 1, characterized in that, The step of determining the air-cooling power P1 of the air-cooling device for the battery based on the predetermined temperature difference ΔT, where P1 = 0.62 * ΔT - 0.73, specifically includes the following steps: Under the same constant temperature environment and different predetermined heating powers P0, the corresponding ΔT is measured and the corresponding air cooling power P1 is determined, wherein the air cooling power P1 of the air cooling device for the battery is equal to the predetermined heating power P0. In the coordinate system, (ΔT, P1) is calibrated for different predetermined heating powers P0. Based on the calibrated multiple (ΔT, P1), the linear variation law of P1 with respect to ΔT is obtained through linear fitting as P1 = 0.62 * ΔT - 0.73; The air cooling power P1 of the air cooling device for the battery is determined based on the predetermined temperature difference ΔT, where P1 = 0.62 * ΔT - 0.73, ΔT is in °C, and P1 is in W.

3. The method for testing the air-cooled power of a battery according to claim 2, characterized in that, In the coordinate system, at least three different (ΔT, P1) values ​​under a predetermined heating power P0 are specified.

4. The method for testing the air-cooled power of a battery according to claim 1, characterized in that, It also includes the following steps: Select the target predetermined air-cooling power P1' and calculate the target predetermined temperature difference ΔT' corresponding to the target predetermined air-cooling power P1'; Stop the continuous heating of the battery, so that the battery can work in a constant temperature environment under predetermined current conditions, and the battery can be cooled synchronously by air cooling device; Adjust the initial settings of the constant temperature environment until the actual predetermined temperature equals the target predetermined temperature difference ΔT', and use the initial settings of the constant temperature environment corresponding to the target predetermined temperature difference ΔT' as the target initial settings.

5. The method for testing the air-cooled power of a battery according to claim 1, characterized in that, The step of continuously heating the battery with a predetermined heating power and simultaneously cooling the battery with a wind-cooling device specifically includes the following steps: A resistance wire is wound around the outside of the battery and connected to the power supply device. Power is supplied to the resistance wire by a power supply device, and the power supply power of the power supply device is set to a predetermined heating power so that the resistance wire continuously heats the battery at the predetermined heating power. The battery is simultaneously cooled by an air-cooling device.

6. The method for testing the air-cooled power of a battery according to claim 5, characterized in that, The resistance wire is a resistance wire with a constant resistance value; The power supply device is a constant voltage and constant current power supply device. The power supply current of the power supply device is I, the power supply voltage of the power supply device is U, and the predetermined heating power is P0=U*I.

7. The method for testing the air-cooled power of a battery according to claim 5, characterized in that, After the first insulating protective layer is wound around the outside of the battery, a resistance wire is wound around the outside of the first insulating protective layer, and then a second insulating protective layer is wound around the outside of the resistance wire.

8. The method for testing the air-cooled power of a battery according to claim 1, characterized in that, The steps of selecting the battery and the air-cooling device, assembling the battery with the air-cooling device, and placing the battery in a constant temperature environment specifically include the following steps: Select the battery and air-cooling device, and install a temperature measuring device on the surface of the battery to detect the surface temperature of the battery. The battery is assembled with an air-cooling device and placed in a constant temperature environment.

9. The method for testing the air-cooled power of a battery according to claim 1, characterized in that, The steps of selecting the battery and the air-cooling device, assembling the battery with the air-cooling device, and placing the battery in a constant temperature environment specifically include the following steps: Select the battery and the air-cooling device, the air-cooling device including the connected heat-conducting part and heat-dissipating part; The battery is attached to the heat-conducting part to assemble the battery with the air-cooling device, and the battery is placed in a constant temperature environment.

10. The method for testing the air-cooled power of a battery according to claim 1, characterized in that, The air-cooling device is a copper heat sink, an aluminum heat sink, or a semiconductor cooling chip.

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