CN111600084A - Equivalent test system and test method for calorific value of battery pack - Google Patents

Abstract

The invention discloses a battery pack heat productivity equivalent test system and a test method, comprising a heating device, a heat preservation device, a charging and discharging device, a cooling part, a water chilling unit, a first temperature measuring device and a second temperature measuring device; the heating device is internally provided with a heating cavity, and the heat preservation device is positioned in the heating cavity and is provided with a heat preservation cavity for placing the battery pack and the cooling part; the charging and discharging equipment is connected with the battery pack and is used for charging and discharging the battery pack; the cooling part is used for directly or indirectly attaching to the battery pack, a liquid outlet of the water chilling unit is connected with an inlet of the cooling part through a liquid outlet pipe, and a liquid inlet of the water chilling unit is connected with an outlet of the cooling part through a liquid return pipe. The invention can equivalently test the heat productivity of the battery pack through the heat exchange quantity of the cooling liquid, can test the heat productivity of the battery pack at different temperatures, can improve the efficiency and accuracy of the test, and reduce the test cost.

Description

Equivalent test system and test method for battery pack calorific value

technical field

The invention relates to a battery pack calorific value equivalent test system and a test method.

Background technique

Under the pressure of the deepening energy crisis and the increasingly prominent environmental problems, electric vehicles have developed rapidly due to their low carbon, energy saving and environmental protection features. As the energy unit and key component of electric vehicles, batteries directly affect the performance of electric vehicles. The battery will generate a large amount of heat during the charging and discharging process, and the accumulation of this heat will seriously affect the performance, safety and life of the battery.

At present, the calorific value of the battery is usually estimated by the internal resistance of the battery in the industry, but the internal resistance of the battery varies greatly with the change of the charge and discharge rate, temperature and SOC value, so it is difficult to determine the accurate value. The industry also relies on accelerated adiabatic calorimeters to test the calorific value of batteries, but accelerated adiabatic calorimeters cannot test the calorific value of batteries at a specific temperature, and accelerated adiabatic calorimeters are expensive.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the defects of the prior art, and to provide an equivalent test system for the calorific value of the battery pack, which can equivalently test the calorific value of the battery pack through the heat exchange of the cooling liquid, and can test the The calorific value at different temperatures can improve the efficiency and accuracy of the test and reduce the cost of the test.

In order to solve the above technical problems, the technical solution of the present invention is: an equivalent test system for the calorific value of a battery pack, which includes a heating device, a heat preservation device, a charging and discharging device, a cooling component, a chiller, a first temperature measuring device and a second temperature measuring device. temperature measuring device; wherein,

A heating cavity is provided in the heating device;

The heat preservation device is located in the heating chamber and is provided with a heat preservation chamber for placing the battery pack and the cooling member, so that after the heating device heats the battery pack to a specific temperature, the heat preservation device is turned off the thermal insulation chamber is used to thermally insulate the battery pack;

The charging and discharging device is connected to the battery pack and used to charge and discharge the battery pack;

the cooling part is used to directly or indirectly fit on the battery pack;

The liquid outlet of the chiller is connected to the inlet of the cooling component through a liquid outlet pipe, and the liquid inlet of the chiller is connected to the outlet of the cooling component through a liquid return pipe, and the chiller is used to connect The cooling liquid flowing out from the cooling part is cooled and cooled and then transported to the cooling part;

the first temperature measuring device is connected to the battery pack and used to measure the temperature of the battery pack;

The second temperature measuring device is respectively connected with the liquid outlet pipe and the liquid return pipe and is used for measuring the temperature of the cooling liquid in the liquid outlet pipe and the liquid return pipe.

Further, the heating device is a high and low temperature test box, and/or the heat preservation device is a heat preservation box, and/or the charging and discharging equipment is a charging and discharging machine, and/or the cooling component is a liquid cold plate.

In order to further improve the cooling effect, the flatness of the liquid cooling plate is within 0.5 mm; and/or the cooling liquid is an aqueous ethylene glycol solution.

A specific solution of the first temperature measuring device is further provided, wherein the first temperature measuring device includes a plurality of first temperature sensors connected to the battery pack.

Further, the battery pack includes at least one battery cell, the battery cell has a positive pole and a negative pole, and the first temperature sensor is connected to both the positive pole and the negative pole.

A specific solution of the second temperature measuring device is further provided, wherein the second temperature measuring device includes at least two second temperature sensors, and at least one of the second temperature sensor.

Further, in order to improve the heat exchange efficiency between the cooling component and the battery pack, a thermally conductive glue or a thermally conductive pad is provided between the cooling component and the battery pack.

The present invention also provides a test method for the above-mentioned battery pack calorific value equivalent test system, wherein the steps of the method include:

S1: charging the battery pack through the charging and discharging device so that the battery pack reaches a specific SOC value P, and attaching the battery pack to the cooling component;

S2: Put the battery pack and the cooling component into the heat preservation device, heat the battery pack to a specific temperature T by the heating device, and then turn off the heat preservation device to keep the battery pack warm heat insulation;

S3: Repeatedly charge and discharge the battery pack, turn on the chiller and adjust the flow and temperature of the cooling liquid in the chiller to keep the temperature of the battery pack constant; record the cooling in the chiller at this time The flow rate of the liquid is measured, and the temperature of the cooling liquid in the liquid outlet pipe and the liquid return pipe is measured by the second temperature measuring device, and then the temperature difference of the cooling liquid in the liquid pipe and the liquid return pipe is calculated;

S4: Calculate the calorific value of the battery pack in unit time; wherein, is the specific heat of the cooling liquid.

Further, the steps of the method also include:

S0: Connect the liquid outlet of the chiller to the inlet of the cooling component through a liquid outlet pipe, connect the liquid inlet of the chiller to the outlet of the cooling component through a liquid return pipe, and connect the first The second temperature measuring device is connected to the liquid outlet pipe and the liquid return pipe, the first temperature measuring device is connected to the battery pack, and the battery pack is electrically connected to the charging and discharging equipment.

Further, the specific step of attaching the battery pack to the cooling component in step S1 is as follows: affix a thermally conductive adhesive or a thermally conductive pad on at least one of the battery pack and the cooling component, and attach the battery pack to at least one of the cooling components. pasting on the cooling component through the thermally conductive adhesive or thermally conductive pad;

And/or the specific step of repeatedly charging and discharging the battery pack in step S3 is to charge the battery pack with constant current at a specific charge and discharge rate M for a specific time t, and then use the same rate M to charge the battery pack with constant current. The current is discharged for the same time t, and the charging and discharging are thus repeated.

After the above technical solution is adopted, the liquid outlet of the chiller is connected to the inlet of the cooling component through a liquid outlet pipe, and the liquid inlet of the chiller is connected to the outlet of the cooling component through a liquid return pipe , the second temperature measuring device is connected with the liquid outlet pipe and the liquid return pipe, and the first temperature sensor in the first temperature measuring device is evenly arranged on the bottom of the battery pack, the positive pole and the negative pole, In order to detect the temperature of the battery pack, the battery pack is electrically connected to the charging and discharging device.

Then, the battery pack is charged by the charging and discharging device to make the battery pack reach a specific SOC value P, and the battery pack is attached to the cooling member; the battery pack and the cooling member are placed The battery pack is heated to a specific temperature T by the heating device, and then the thermal insulation device is turned off to heat and insulate the battery pack. Charge the battery pack with constant current for a specific time t at a specific charge and discharge rate M, and then discharge the battery pack with a constant current for the same period of time t at the same rate M, and repeat the charging and discharging; at the same time, turn on the chiller and adjust the The flow rate and temperature of the cooling liquid in the chiller, so as to keep the temperature of the battery pack constant; record the flow rate of the cooling liquid in the chiller at this time, and measure the liquid outlet pipe and the temperature through the second temperature measuring device. The temperature of the cooling liquid in the liquid return pipe is calculated, and then the temperature difference between the liquid pipe and the cooling liquid in the liquid return pipe is calculated. Wherein, because the battery pack is insulated by the thermal insulation device, so that there is no heat exchange between the battery pack and the heating device, so when the temperature of the battery pack is constant, the calorific value of the battery pack is equal to that of the cooling liquid Heat exchange to the battery pack. The heat exchange amount of the cooling liquid to the battery pack per unit time is the specific heat of the cooling liquid, and then the calorific value of the battery pack per unit time can be obtained, which greatly improves the efficiency and accuracy of the calorific value test. Reduce the cost of testing. And by changing the values of the specific temperature T, specific charge and discharge rate M and specific SOC value P, the calorific value of the battery pack at different temperatures, different charge and discharge rates and different SOC values can be tested.

Description of drawings

FIG. 1 is a schematic structural diagram of a battery pack calorific value equivalent testing system of the present invention.

Detailed ways

In order to make the content of the present invention easier to understand clearly, the present invention will be described in further detail below according to specific embodiments and in conjunction with the accompanying drawings.

Example 1

As shown in Figure 1, an equivalent test system for the calorific value of a battery pack includes a heating device 1, a heat preservation device 2, a charging and discharging device 3, a cooling component 4, a chiller 5, a first temperature measuring device and a second temperature measuring device device; wherein,

The heating device 1 is provided with a heating chamber 6;

The heat preservation device 2 is located in the heating chamber 6 and is provided with a heat preservation chamber 7 for placing the battery pack 8 and the cooling member 4, so that when the heating device 1 heats the battery pack 8 to a specific temperature After that, the thermal insulation device 2 closes the thermal insulation cavity 7 to perform thermal insulation on the battery pack 8;

The charging and discharging device 3 is connected to the battery pack 8 and used to charge and discharge the battery pack 8;

The cooling component 4 is used to directly or indirectly fit on the battery pack 8;

The liquid outlet of the chiller 5 is connected to the inlet of the cooling component 4 through the liquid outlet pipe 9, and the liquid inlet of the chiller 5 is connected to the outlet of the cooling component 4 through the liquid return pipe 10. The chiller 5 is used to connect the cooling liquid flowing out of the cooling part 4, and cool the cooling liquid and transport it to the cooling part 4;

The first temperature measuring device is connected to the battery pack 8 and used to measure the temperature of the battery pack 8;

The second temperature measuring devices are respectively connected with the liquid outlet pipe 9 and the liquid return pipe 10 and are used to measure the temperature of the cooling liquid in the liquid outlet pipe 9 and the liquid return pipe 10 . Specifically, the charging and discharging device 3 is electrically connected to the positive and negative electrodes of the battery pack 8, and the battery pack 8 will generate a large amount of heat during the charging and discharging process; 4 and the chiller 5 can take away the heat in the battery pack 8, and the chiller 5 can adjust and record the temperature and flow of the cooling liquid, and then can adjust the battery Cooling rate for group 8. When the cooling rate and the calorific value of the battery pack 8 reach a balance, the temperature of the battery pack 8 measured by the first temperature measuring device remains constant, because the temperature keeping device 2 closes the keeping warm cavity 7 so that the battery pack 8 There is no heat exchange between the battery pack 8 and the heating device 1, so when the temperature of the battery pack 8 is constant, the heat generation of the battery pack 8 is equal to the heat exchange of the cooling liquid to the battery pack 8, and the cooling liquid to the battery pack 8 per unit time. The heat exchange of group 8 is, where is the temperature difference of the cooling liquid in the liquid outlet pipe 9 and the liquid return pipe 10 measured by the second temperature measuring device, the unit is; is the specific heat of the cooling liquid, the unit is the cooling liquid The mass flow rate, unit; through the above test system, the calorific value of the battery pack 8 at different temperatures, different charge and discharge rates and different SOC values can be measured equivalently, which improves the efficiency and accuracy of the calorific value test, and reduces the test time. the cost of.

Specifically, the battery pack 8 may be, but is not limited to, a lithium-ion power battery pack. The chiller 5 may include flow valves, flow meters, compressors, evaporators, thermometers and other components. The structure is the prior art well known to those skilled in the art, and details are not described in this embodiment.

As shown in FIG. 1 , the heating device 1 can be a high and low temperature test box, the heat preservation device 2 can be a heat preservation box, the charging and discharging device 3 can be a charging and discharging machine, and the cooling component 4 can be a liquid cold plate Specifically, the high and low temperature test box, the incubator charging and discharging machine, and the liquid cooling plate are all the prior art well known to those skilled in the art, and will not be described in detail in this embodiment.

In this embodiment, the flatness of the liquid cooling plate is within 0.5 mm in order to improve the cooling effect on the battery pack 8 , and the cooling liquid may be an aqueous ethylene glycol solution.

As shown in FIG. 1 , the first temperature measuring device may include a plurality of first temperature sensors connected to the battery pack 8 ; specifically, the first temperature sensors are evenly distributed on the bottom of the battery pack 8 .

Specifically, the battery pack 8 includes at least one battery cell, the battery cell has a positive pole and a negative pole, and the first temperature sensor is connected to both the positive pole and the negative pole; in this embodiment In an example, the battery pack 8 may further include a main positive pole connected to all the positive poles, and a main negative pole connected to all the negative poles, and the first temperature sensor cannot be arranged on the main positive pole. The position of the column and the main negative pole, the number of the first temperature sensors is greater than the number of the battery cells.

As shown in FIG. 1 , the second temperature measuring device may include at least two second temperature sensors, and at least one of the second temperature sensors is connected to the liquid outlet pipe 9 and the liquid return pipe 10 respectively.

In this embodiment, a thermally conductive adhesive or a thermally conductive pad may be provided between the cooling component 4 and the battery pack 8 , and the thermally conductive adhesive or thermally conductive pad is in sufficient contact with the battery pack 8 and the cooling component 4 respectively. , thereby improving the heat exchange efficiency between the battery pack 8 and the cooling member 4 ; in this embodiment, the cooling member 4 is attached to the bottom of the battery pack 8 .

Embodiment 2

A test method of the battery pack calorific value equivalent test system as described in the first embodiment, the steps of the method include:

S1: Charge the battery pack 8 through the charging and discharging device 3 to make the battery pack 8 reach a specific SOC value P, and attach the battery pack 8 to the cooling member 4;

S2: Put the battery pack 8 and the cooling part 4 into the heat preservation device 2, heat the battery pack 8 to a specific temperature T by the heating device 1, and then close the heat preservation device 2 to The battery pack 8 is thermally insulated;

S3: Repeatedly charging and discharging the battery pack 8 through the charging and discharging device 3, turning on the chiller 5 and adjusting the flow and temperature of the cooling liquid in the chiller 5, so that the temperature of the battery pack 8 Keep it constant; record the flow rate of the cooling liquid in the chiller 5 at this time, and measure the temperature of the cooling liquid in the liquid outlet pipe 9 and the liquid return pipe 10 through the second temperature measuring device, and then calculate the liquid The temperature difference between the cooling liquid in the pipe 9 and the liquid return pipe 10; specifically, when the first temperature measuring device detects that the temperature change rate of the battery pack 8 is less than 0.5°C/30min, the temperature of the battery pack 8 i.e. remain constant;

S4: Calculate the calorific value of the battery pack 8 per unit time; wherein, is the specific heat of the cooling liquid. Because the battery pack 8 is insulated by the heat preservation device 2, there is no heat exchange between the battery pack 8 and the heating device 1. Therefore, when the temperature of the battery pack 8 is constant, the power of the battery pack 8 will not be heated. The heat is equal to the heat exchange of the cooling liquid to the battery pack 8 . The amount of heat exchanged by the cooling liquid to the battery pack 8 per unit time is 100,000, and then the calorific value of the battery pack 8 in a unit time can be obtained, which greatly improves the efficiency and accuracy of the calorific value test and reduces the cost of the test. .

As shown in Figure 1, the steps of the method may also contain:

S0: Connect the liquid outlet of the chiller 5 to the inlet of the cooling component 4 through the liquid outlet pipe 9, and connect the liquid inlet of the chiller 5 to the outlet of the cooling component 4 through the liquid return pipe 10 Connect the second temperature measuring device to the liquid outlet pipe 9 and the liquid return pipe 10, connect the first temperature measuring device to the battery pack 8, and connect the battery pack 8 to the charge and discharge The device 3 is electrically connected. Specifically, the specific step of connecting the first temperature measuring device to the battery pack 8 in step S0 is to evenly arrange the first temperature sensors in the first temperature measuring device on the bottom of the battery pack 8 and the positive electrode on the column and the negative pole, so as to detect the temperature of the battery pack 8 .

In this embodiment, the specific step of attaching the battery pack 8 to the cooling member 4 in step S1 is to paste thermally conductive adhesive on at least one of the battery pack 8 and the cooling member 4 or thermal pad, and attach the battery pack 8 to the cooling component 4 through the thermal glue or thermal pad. The specific step of repeatedly charging and discharging the battery pack 8 in step S3 is to charge the battery pack 8 with a constant current for a specific time t at a specific charge and discharge rate M, and then charge the battery pack 8 with the same rate M for a constant current. The charging and discharging are repeated for the same time t; specifically, the specific charging and discharging rate M is generally not less than 0.3C, and the specific time t can be 10s. In this embodiment, by changing the values of the specific temperature T, the specific charge-discharge rate M and the specific SOC value P, the calorific value of the battery pack 8 at different temperatures, different charge-discharge rates and different SOC values can be tested. .

The working principle of the present invention is as follows:

The liquid outlet of the chiller 5 is connected to the inlet of the cooling component 4 through the liquid outlet pipe 9, and the liquid inlet of the chiller 5 is connected to the outlet of the cooling component 4 through the liquid return pipe 10. The second temperature measuring device is connected with the liquid outlet pipe 9 and the liquid return pipe 10, and the first temperature sensor in the first temperature measuring device is evenly arranged at the bottom of the battery pack 8, the positive pole and the negative pole. in order to detect the temperature of the battery pack 8 and electrically connect the battery pack 8 to the charging and discharging device 3 .

Then, the battery pack 8 is charged by the charging and discharging device 3 to make the battery pack 8 reach a specific SOC value P, and the battery pack 8 is attached to the cooling member 4; The battery pack 8 is heated to a specific temperature T by the heating device 1, and then the thermal insulation device 2 is turned off to keep the battery pack 8 insulated. hot. Charge the battery pack 8 with a constant current for a specific time t at a specific charge and discharge rate M, and then discharge the battery pack 8 with a constant current for the same period of time t at the same rate M, and repeat charging and discharging in this way; at the same time, the chiller is turned on. 5 and adjust the flow and temperature of the cooling liquid in the chiller 5 to keep the temperature of the battery pack 8 constant; record the flow of the cooling liquid in the chiller 5 at this time, and measure it through the second temperature measuring device The temperature of the cooling liquid in the liquid outlet pipe 9 and the liquid return pipe 10 is calculated, and then the temperature difference of the cooling liquid in the liquid pipe 9 and the liquid return pipe 10 is calculated. Wherein, because the heat preservation device 2 performs thermal insulation on the battery pack 8, so that there is no heat exchange between the battery pack 8 and the heating device 1, when the temperature of the battery pack 8 is constant, the battery pack 8 The calorific value is equal to the heat exchange of the cooling liquid to the battery pack 8 . The heat exchange amount of the cooling liquid to the battery pack 8 per unit time is the specific heat of the cooling liquid, and then the calorific value of the battery pack 8 in a unit time can be obtained, which greatly improves the efficiency and accuracy of the calorific value test. degree, reducing the cost of testing. And by changing the values of the specific temperature T, specific charge and discharge rate M and specific SOC value P, the calorific value of the battery pack 8 at different temperatures, different charge and discharge rates and different SOC values can be tested.

The specific embodiments described above further describe in detail the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention, and are not intended to limit the present invention. invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying what is indicated. A device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in use, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhanging" etc. do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the present invention, unless otherwise expressly specified and limited, the first feature above or below the second feature may include the first and second features in direct contact, or may include the first and second features that are not in direct contact with each other. through additional characteristic contact between them. Also, the first feature being above, above and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is below, below and below the second feature includes the first feature is directly below and diagonally below the second feature, or simply means that the first feature level is smaller than the second feature.

Claims (10)

1. A battery pack calorific value equivalent test system, characterized in that it comprises a heating device (1), a heat preservation device (2), a charging and discharging device (3), a cooling component (4), a chiller (5), A first temperature measuring device and a second temperature measuring device; wherein, The heating device (1) is provided with a heating cavity (6); The heat preservation device (2) is located in the heating chamber (6) and is provided with a heat preservation chamber (7) for placing the battery pack (8) and the cooling component (4), so that when the heating device ( 1) After heating the battery pack (8) to a specific temperature, the thermal insulation device (2) closes the thermal insulation cavity (7) to thermally insulate the battery pack (8); The charging and discharging device (3) is connected to the battery pack (8) and used to charge and discharge the battery pack (8); The cooling component (4) is used to be directly or indirectly attached to the battery pack (8); The liquid outlet of the chiller (5) is connected to the inlet of the cooling component (4) through a liquid outlet pipe (9), and the liquid inlet of the chiller (5) is connected to the cooling element (4) through a liquid return pipe (10). The outlet of the cooling part (4) is connected, and the chiller (5) is used to connect the cooling liquid flowing out of the cooling part (4), and the cooling liquid is cooled and cooled and then transported to the cooling part (4) middle; The first temperature measuring device is connected to the battery pack (8) and used to measure the temperature of the battery pack (8); The second temperature measuring device is respectively connected with the liquid outlet pipe (9) and the liquid return pipe (10) and is used to measure the cooling liquid in the liquid outlet pipe (9) and the liquid return pipe (10). temperature. 2. The battery pack calorific value equivalent test system according to claim 1, wherein the heating device (1) is a high and low temperature test box, and/or the heat preservation device (2) is a heat preservation box, and /or the charging and discharging device (3) is a charging and discharging machine, and/or the cooling component (4) is a liquid cooling plate. 3. The battery pack calorific value equivalent test system according to claim 2, wherein the flatness of the liquid cooling plate is within 0.5 mm; and/or the cooling liquid is an aqueous ethylene glycol solution. 4. The battery pack calorific value equivalent testing system according to claim 1, wherein the first temperature measuring device comprises a plurality of first temperature sensors connected to the battery pack (8). 5. The battery pack calorific value equivalent test system according to claim 4, wherein the battery pack (8) comprises at least one battery cell, the battery cell has a positive pole and a negative pole, and the battery The first temperature sensor is connected to both the positive pole and the negative pole. 6. The battery pack calorific value equivalent test system according to claim 1, wherein the second temperature measuring device comprises at least two second temperature sensors, the liquid outlet pipe (9) and the return pipe The liquid pipes (10) are respectively connected with at least one of the second temperature sensors. 7. The battery pack calorific value equivalent test system according to claim 1, characterized in that a thermally conductive glue or a thermally conductive pad is provided between the cooling component (4) and the battery pack (8). 8. A test method of the battery pack calorific value equivalent test system according to any one of claims 1 to 7, wherein the steps of the method comprise: S1: The battery pack (8) is charged by the charging and discharging device (3) so that the battery pack (8) reaches a specific SOC value P, and the battery pack (8) is attached to the cooling member (4) on; S2: Put the battery pack (8) and the cooling component (4) into the heat preservation device (2), and heat the battery pack (8) to a specific temperature T by the heating device (1). , and then turn off the thermal insulation device (2) to perform thermal insulation on the battery pack (8); S3: Repeatedly charging and discharging the battery pack (8), turning on the chiller (5) and adjusting the flow and temperature of the cooling liquid in the chiller (5), so that the battery pack (8) has Keep the temperature constant; record the flow rate of the cooling liquid in the chiller (5) at this time, and measure the cooling liquid in the liquid outlet pipe (9) and the liquid return pipe (10) through the second temperature measuring device temperature, and then calculate the temperature difference of the cooling liquid in the liquid pipe (9) and the liquid return pipe (10); S4: Calculate the calorific value of the battery pack (8) per unit time; wherein, is the specific heat of the cooling liquid. 9. testing method according to claim 8, is characterized in that, also contains in the step of method: S0: The liquid outlet of the chiller (5) is connected to the inlet of the cooling component (4) through the liquid outlet pipe (9), and the inlet of the chiller (5) is connected through the liquid return pipe (10). The liquid port is connected to the outlet of the cooling component (4), the second temperature measuring device is connected to the liquid outlet pipe (9) and the liquid return pipe (10), and the first temperature measuring device is connected to the liquid outlet pipe (9) and the liquid return pipe (10). On the battery pack (8), the battery pack (8) is electrically connected with the charging and discharging device (3). 10. test method according to claim 8, is characterized in that, The specific step of sticking the battery pack (8) on the cooling component (4) in step S1 is to stick on at least one of the battery pack (8) and the cooling component (4) thermally conductive adhesive or thermally conductive pad, and attach the battery pack (8) to the cooling component (4) through the thermally conductive adhesive or thermally conductive pad; And/or the specific step of repeatedly charging and discharging the battery pack (8) in step S3 is to charge the battery pack (8) with a constant current for a specific time t at a specific charge and discharge rate M, and then charge the battery pack (8) with the same rate M for a specific time. The battery pack (8) is charged and discharged repeatedly for the same time t with constant current discharge.

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