CN105548891A - Battery heat test device and battery heat test method - Google Patents

Abstract

The invention discloses a battery heat testing device and method, which is used to test the heat of the battery under test in the process of charging and discharging in a constant temperature box. The circulation system conducts the heat emitted by the battery under test to the adiabatic chamber and accumulates the heat of the cooling liquid, so as to obtain the accumulated heat consumption during the charging and discharging process of the battery under test. The battery heat testing device and method of the present invention can effectively and accurately measure the heat emitted by the battery under test when it is charged and discharged, so as to actually understand the heating condition of the battery or battery pack, perform effective heat management, and effectively improve the lithium battery used in electric vehicles. The thermal safety of ion batteries provides first-hand reliable information, which is of great significance to the thermal management and thermal safety of electric vehicles.

Description

Battery heat testing device and battery heat testing method

technical field

The invention relates to the field of battery testing, in particular to a battery heat testing device and a battery heat testing method.

Background technique

Accurately measuring the calorific value of the battery is of great significance to the thermal management and thermal safety of electric vehicles, and it is indispensable for the control of thermal runaway of the battery pack and the reasonable implementation of thermal management strategies, which in turn play an indispensable role in the safety of electric vehicles. If the heat generation of the battery is not well controlled, it is very likely to cause safety hazards such as explosions and fires of electric vehicles. Therefore, the measurement of battery calorific value is particularly important for the formulation of thermal management strategies and the safety of electric vehicles.

Knowing the calorific value of existing batteries is generally based on model calculations. The calorific value of the battery obtained through simulation, simulation, approximation and other thermal models is difficult to fully reflect the complex thermal reaction process such as Joule heat and reaction heat inside the battery. It provides a reliable basis for effective thermal management to improve the thermal safety of lithium-ion batteries for electric vehicles.

Contents of the invention

In view of this, the object of the present invention is to provide a battery heat testing device and a battery heat testing method that can be used for a soft-packed lithium-ion battery cell, so as to obtain the real calorific value during the charging and discharging process of the battery, so as to find out the battery or The heating condition of the battery pack can be effectively managed to provide a reliable basis for improving the thermal safety of lithium-ion batteries used in electric vehicles.

The invention provides a battery heat testing device, comprising:

temperate box;

an adiabatic chamber, the adiabatic chamber is located in the incubator;

A water tank group, the water tank group is filled with liquid coolant, and the battery under test is clamped, and the water tank group together with the battery under test is placed in the heat-insulated chamber;

Water pipe group, the water pipe group is located in the constant temperature box, and the water pipe group connects the water tank group, the water pump, the heat meter, and the radiator, forming the water tank group passing through the water pump to the heat meter, and then the heat A circulation pipeline from the radiator to the radiator, from the radiator to the heat meter, and from the heat meter to the water tank group, so that the coolant circulates in the circulation pipeline;

a water pump, the water pump is located in the constant temperature box and outside the adiabatic chamber, and is used to drive the circulation of the coolant in the circulation pipeline;

a heat meter, the heat meter is located in the constant temperature box and outside the adiabatic chamber, and is used to obtain the cumulative calorific value of the cooling liquid flowing through the heat meter;

a radiator, the radiator is located in the thermostatic box and outside the adiabatic chamber, and is used to dissipate the heat carried in the coolant flowing through the radiator into the thermostatic box;

at least one temperature sensor, arranged on the surface of the battery under test, for obtaining temperature information on the surface of the battery under test;

An electrode connection port, the electrode connection port is located outside the adiabatic chamber and electrically connected to the tab of the battery under test, the electrode connection port is used to connect to an external charging and discharging device, and its shape is designed into a multiple bending structure to Increase the heat dissipation area in contact with the water tank group, and reduce the heat leakage caused by the connection with the main cable of the charging and discharging equipment;

A computer, the computer is located outside the incubator and connected to the heat meter and at least one temperature sensor, the computer is used to receive the temperature information obtained by the at least one temperature sensor, and receive the temperature information obtained by the heat meter. cumulative calorific value.

Further, the battery heat testing device also includes:

A pressure sensor, the pressure sensor is located in the heat insulation chamber and connected to the computer, the pressure sensor is used to obtain the pressure information applied by the water tank group to the battery under test and send it to the computer for monitoring .

Further, the battery heat testing device also includes:

An electrode heat conduction connector, the electrode heat conduction connector is located in the heat insulation chamber, one end of the electrode heat conduction connector is connected to the pole ear of the battery under test, and the other end of the electrode heat conduction connector is used as the electrode connection The surface of the electrode heat-conducting connector is covered with heat-conducting and insulating silica gel, and the water tank group is pressed against the heat-conducting and insulating silica gel.

Further, the water tank group includes a lower water tank and an upper water tank; wherein,

The lower water tank is located on the lower side of the battery under test, the upper water tank is located on the upper side of the battery under test, and the battery under test is located between the lower water tank and the upper water tank;

The lower water tank and the upper water tank are communicated through a hose, so that the coolant in the lower water tank can enter the upper water tank through the hose;

The lower water tank is provided with a water inlet to connect the water pipe group, so that the cooling liquid in the water pipe group can flow into the lower water tank through the water inlet;

The upper water tank is provided with a water outlet to connect the water pipe group, so that the cooling liquid in the upper water tank can flow out of the upper water tank through the water outlet.

Further, the adiabatic chamber is provided with through holes adapted to the water inlet and outlet, so that the water tank group located in the adiabatic chamber and the water pump, heat meter and radiator located outside the adiabatic chamber communicate through the water pipe group.

Further, the water pipe group includes:

A water outlet pipe, the water outlet pipe is connected between the water outlet of the upper water tank and the water inlet of the water pump;

A first guide tube, the first guide tube is connected between the water outlet of the water pump and the water inlet of the heat meter;

A second guide pipe, the second guide pipe is connected between the heat dissipation water delivery port of the heat meter and the water inlet of the radiator;

A third guide tube, the third guide tube is connected between the water outlet of the radiator and the heat dissipation return port of the heat meter;

A water inlet pipe, the water inlet pipe is connected between the water outlet of the heat meter and the water inlet of the lower water tank.

Further, the at least one temperature sensor is respectively arranged on the surface of the battery under test, the tabs of the battery under test, in the upper water tank and in the lower water tank, and is connected to the computer to obtain the surface temperature information of the battery under test , the tab temperature information of the battery under test, the temperature information in the upper water tank and the temperature information in the lower water tank, and send the obtained temperature information to the computer.

Further, the heat insulation chamber includes a heat insulation chamber body and a heat insulation chamber cover; wherein,

An accommodating space with an upper opening is formed inside the adiabatic chamber body, and the water tank group and the battery under test are placed in the accommodating space;

The heat insulation chamber cover is arranged above the heat insulation chamber body, and opens and closes the opening of the accommodating space under the control of an opening and closing motor, wherein the opening and closing motor is electrically connected to the computer for The opening and closing operations of the adiabatic chamber cover are performed under the control of the computer.

Further, the adiabatic chamber is provided with a vacuum port to extract the air medium in the adiabatic chamber, so as to prevent the air from absorbing the heat released from the battery.

The present invention also provides a method for testing battery heat by using the battery heat test device described in any one of the above items, including:

Place the battery under test between the water tanks in the adiabatic chamber, and electrically connect the tabs of the battery under test to the electrode connection port;

connecting an external charging and discharging device to the electrode connection port;

initial temperature equilibration of all components located within said incubator;

Monitor the temperature information of each temperature sensor in real time through the computer;

When the temperature information of each temperature sensor reaches the initial temperature and stabilizes, monitor and store the temperature information and flow information obtained by the heat meter in real time through the computer;

Turn on the water pump to drive the circulation of the coolant in the circulation line;

Turn on the external charging and discharging equipment to charge and discharge the battery under test;

When the charge and discharge are completed, and the temperature information of each temperature sensor returns to the initial temperature and maintains for a period of time and/or the cumulative calorific value of the heat meter remains constant, stop the test;

The accumulated calorific value of the heat meter is regarded as the heat released by the battery under test during the charging and discharging process.

It can be seen from the above scheme that the battery heat testing device and battery heat testing method of the present invention can effectively and accurately measure the heat emitted by the battery under test when it is charging and discharging, and then provide a practical understanding of the heating status of the battery or battery pack, and conduct Effective thermal management, thereby effectively improving the thermal safety of lithium-ion batteries for electric vehicles, provides first-hand reliable information.

Description of drawings

The following drawings only illustrate and explain the present invention schematically, and do not limit the scope of the present invention.

Fig. 1 is a schematic diagram of a cross-sectional structure of a battery heat testing device according to an embodiment of the present invention;

Figure 2 is an enlarged schematic view of the structure of the surrounding area of the battery under test in Figure 1;

Fig. 3 is a schematic diagram of a longitudinal cross-sectional structure of an adiabatic chamber in an embodiment of the present invention;

FIG. 4 is a flow chart of a battery heat test method according to an embodiment of the present invention.

Label description

1. Battery heat test device

11. Constant temperature box

12. Insulation room

121. Insulation chamber body

122. Insulation chamber cover

125. Open and close motor

13. Water tank group

131. Lower water tank

132. Upper water tank

14. Water pipe group

141. Outlet pipe

142. First diversion tube

143. Second diversion tube

144. The third diversion pipe

145. Water inlet pipe

151. Water pump

152. Heat meter

153. Radiator

161. Temperature sensor

162. Pressure sensor

17. Electrode connection port

171. Electrode heat conduction connector

18. Vacuum interface

19. Computer

2. The battery under test

21. Ears

211. Ear clip

detailed description

In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.

In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.

In order to make the drawings concise, the figures in each figure only schematically show the relevant parts of the present invention, and do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked.

Herein, "one" does not mean limiting the number of relevant parts of the present invention to "only one", and "one" does not mean excluding the case that the number of relevant parts of the present invention is "more than one".

In this article, "upper", "lower", "front", "rear", "left", "right", etc. are only used to indicate the relative positional relationship between related parts, rather than to limit the absolute position of these related parts .

In this article, "first", "second", etc. are only used to distinguish each other, not to indicate the degree of importance and order, or the prerequisite for mutual existence.

Herein, "equal", "identical" and the like are not strictly restricted in the sense of mathematics and/or geometry, but also include errors understandable by those skilled in the art and allowed in manufacture or use. Unless otherwise stated, a numerical range herein includes not only the entire range within its two endpoints, but also several subranges subsumed therein.

As shown in Figure 1, the battery heat test device 1 of the embodiment of the present invention mainly includes a constant temperature box 11, an adiabatic chamber 12, a water tank group 13, a water pipe group 14, a water pump 151, a heat meter 152, a radiator 153, a temperature sensor 161, a pressure Sensor 162 , electrode connection port 17 and computer 19 . Wherein, other components in the battery heat testing device 1 except the computer 19 are placed in the incubator 11 . The heat insulation chamber 12 is located in the thermostat 11 . The water tank group 13 is filled with coolant (such as water) and holds the battery under test 2 . The water tank group 13 together with the battery under test 2 is placed in the heat-insulated chamber. The water pipe group 14 is located in the constant temperature tank 11, and the water pipe group 14 communicates with the water tank group 13, the water pump 151, the heat meter 152 and the radiator 153, forming a flow from the water tank group 13 to the heat meter through the water pump 151. 152, the circulation pipeline from the heat meter 152 to the radiator 153 and back to the heat meter 152 from the radiator 153, and then from the heat meter 152 to the water tank group 13, so that the Coolant circulates in the circulation line. The water pump 151 is located in the thermostatic box 11 and outside the adiabatic chamber 12 for driving the circulation of the coolant in the circulation pipeline. The heat meter 152 is located in the constant temperature box 11 and outside the adiabatic chamber 12, and is used to obtain the temperature information of the coolant flowing out of the water tank group 13 in the circulation pipeline, and obtain the temperature information of the coolant in the circulation pipeline. The temperature information of the coolant flowing into the water tank group 13 and the flow information of the coolant flowing through the heat meter 152 are obtained. The radiator 153 is located inside the thermostatic box 11 and outside the adiabatic chamber 12 for dissipating the heat carried by the coolant flowing through the radiator 153 into the thermostatic box 11 . The number of the temperature sensor 161 is at least one, respectively arranged on the surface of the battery 2 under test, and used to obtain temperature information on the surface of the battery 2 under test. The pressure sensor 162 is located in the adiabatic chamber 12, and the pressure sensor 162 is used to obtain the pressure information applied by the water tank group 13 to the battery 2 under test and send it to the computer 19 for monitoring. The electrode connection port 17 is located outside the adiabatic chamber 12 and electrically connected to the tab 21 of the battery under test 2 , and the electrode connection port 17 is used to connect to an external charging and discharging device (not shown in the figure). The computer 19 is located outside the incubator 11 and is connected to the heat meter 152, the temperature sensor 161 and the pressure sensor 162, and the computer 19 is used to receive the temperature information obtained by the at least one temperature sensor 161, receive The temperature information and flow information obtained by the heat meter 152, and the heat emitted by the battery under test 2 are obtained according to the received information when the battery under test 2 is being charged and discharged; the computer 19 is also used to The pressure sensor 162 detects the pressure information applied by the water tank group 13 to the battery under test 2 to ensure good contact between the water tank group 13 and the battery under test 2 so that the battery under test 2 The emitted heat can be transferred to the coolant in the water tank group 13 in time and smoothly.

In addition, the battery thermal testing device 1 further includes an electrode heat-conducting connector 171 . The electrode heat conduction connector 171 is located in the heat insulation chamber 12, and one end of the electrode heat conduction connector 171 is connected to the tab 21 of the battery under test 2 through the tab clip 211. The electrode heat conduction connector 171 The other end of the electrode is used as the electrode connection port 17, the surface of the electrode heat-conducting connector 171 is covered with heat-conducting and insulating silica gel, and the water tank group 13 is pressed against the heat-conducting and insulating silica gel. The electrode heat-conducting connector 171 is made of high-quality conductive material and processed into a structure with a large number of bending turns, so that it can transfer heat to the cooling system in the water tank group 13 sufficiently and rapidly when the battery 2 under test is charging and discharging. Liquid, while reducing heat transfer to external charging and discharging equipment, reducing heat loss and avoiding heat leakage. The tab clip 211 is made of high-quality conductive material, clamped on the tab 21 and connected to the electrode thermal connector 171 to reduce the contact resistance at the tab 21 .

As shown in Figure 2, a plurality of temperature sensors 161 are respectively arranged on the surface of the battery under test 2, the tab 21 of the battery under test 2, and in the water tank group 13 (not shown in the figure), and are connected to the computer 19 , to acquire the surface temperature information of the tested battery 2 , the temperature information of the tab 21 of the tested battery 2 , and the temperature information in the water tank group 13 , and send the acquired temperature information to the computer 19 . In a specific embodiment, nine temperature sensors 161 are evenly arranged on the surface of the battery 2 under test, and one temperature sensor 161 is arranged at each of the two tabs 21 together with the tab clips 211, that is, at the two tabs 21 together with the tab clips Two temperature sensors 161 are arranged at the sheet 211, and two temperature sensors 161 are arranged in the water tank group 13. These temperature sensors 161 are connected with the computer 19 outside the constant temperature box 11 through data lines, and the temperature of the battery 2 under test is monitored in real time by the computer 19. surrounding temperature. The pressure sensor 162 is adjusted to be flush with the surface of the battery 2 under test, so as to detect the pressure exerted by the water tank group 13 on the surface of the battery 2 under test.

As shown in FIG. 3 , in the embodiment of the present invention, the water tank group 13 includes a lower water tank 131 and an upper water tank 132 . Wherein, the lower water tank 131 is located at the lower side of the tested battery 2, the upper water tank 132 is located at the upper side of the tested battery 2, and the tested battery 2 is located at the lower water tank 131 and the upper water tank 132. between. Referring to Fig. 1, Fig. 2 and Fig. 3, the lower water tank 131 and the upper water tank 132 are communicated through a hose 133, so that the coolant in the lower water tank 131 can enter the said lower water tank 131 through the hose 133 Upper water tank 132. The hose 133 is a metal hose to provide good heat dissipation at the hose 133, and the lower tank 131 has a water inlet to connect the water pipe group 14, so that the cooling liquid in the water pipe group 14 can pass through the water pipe group 14. The water inlet flows into the lower water tank 131, and the upper water tank 132 has a water outlet to connect the water pipe group 14, so that the coolant in the upper water tank 132 can flow out of the upper water tank 132 through the water outlet. . The adiabatic chamber 12 is provided with through holes adapted to the water inlet and water outlet, so that the water tank group 13 located in the adiabatic chamber 12 and the water pump 151, heat meter 152, and radiator 153 located outside the adiabatic chamber pass through the The water pipe group 14 is connected. The two temperature sensors 161 placed in the water tank group 13 are respectively placed in the lower water tank 131 and the upper water tank 132 .

Continuing to refer to FIG. 3 , the heat insulation chamber 12 includes a heat insulation chamber body 121 and a heat insulation chamber cover 122 . Wherein, an accommodating space with an upper opening is formed inside the adiabatic chamber body 121 , and the water tank group 13 and the battery under test 2 are placed in the accommodating space. The heat insulation chamber cover 122 is arranged above the heat insulation chamber body 121, and opens and closes the opening of the accommodation space under the control of an opening and closing motor 125, wherein the opening and closing motor 125 is electrically connected to the The computer 19 is used to perform the opening and closing operations of the adiabatic chamber cover 122 under the control of the computer 19. In order to ensure the measurement accuracy, the switch motor 125 is preferably located in the thermostatic box 11 . In addition, the inner side wall of the adiabatic chamber body 121 is provided with water tank guide rails, and the water tank group 13 is provided with guide rail grooves matching with the water tank guide rails, so that the water tank group 13 can move along a predetermined direction.

In addition, when performing the thermal test of the battery 2 under test, the heat insulation chamber 12 is preferably kept in a vacuum state, so as to prevent the influence of the air existing in the heat insulation chamber 12 . Therefore, in the embodiment of the present invention, a vacuuming device (not shown in the figure) is also included, and as shown in FIG. 1 , the adiabatic chamber 12 is provided with a vacuuming interface 18 to connect with the vacuuming device. After the battery under test 2 is loaded and before the heat test of the battery under test 2 is carried out, the inside of the adiabatic chamber 12 is evacuated by vacuuming equipment.

As shown in FIG. 1 , in the embodiment of the present invention, the water pipe set 14 includes a water outlet pipe 141 , a first flow guide pipe 142 , a second flow guide pipe 143 , a third flow guide pipe 144 and a water inlet pipe 145 . Wherein, the water outlet pipe 141 is connected between the water outlet of the upper water tank 132 and the water inlet of the water pump 151 . The first guide pipe 142 is connected between the water outlet of the water pump 151 and the water inlet of the heat meter 152 . The second guide pipe 143 is connected between the heat dissipation water outlet of the heat meter 153 and the water inlet of the radiator 153 . The third guide pipe 144 is connected between the water outlet of the radiator 153 and the heat dissipation return water outlet of the heat meter 152 . The water inlet pipe 145 is connected between the water outlet of the heat meter 152 and the water inlet of the lower water tank 131 .

In order to prevent the heat loss of the coolant in the circulation pipeline, the periphery of the water pipe group 14 and each interface part are coated with heat insulating materials, so that the heat carried by the coolant can only be dissipated into the thermostat 11 through the radiator 153 .

In the embodiment of the present invention, a PT1000 sensor is used as a temperature sensor in the heat meter 152 to measure the temperature of the coolant flowing into the heat meter 152 in the water outlet pipe 141 (that is, to flow out of the upper water tank 132), and to measure the temperature of the coolant flowing out of the heat meter 152 in the water inlet pipe 145. (that is, the temperature of the coolant flowing into the lower water tank 131), a turbine flowmeter is used as a flow sensor to measure the flow of the coolant in the circulation line. The calorie meter 152 uses an integrator to perform calorie calculations, and/or utilizes the computer 19 to perform calorie calculations. The calculation is based on the temperature and flow data acquired by the temperature sensor and the flow sensor in the calorie meter 152 . The calculation method adopts the k-factor compensation method, which has a correction function, so it has high precision, conforms to the OIML-R75 international regulations and EN1434 European standards, and is the most advanced calculation method for calculation accuracy. The calculation formula using k coefficient compensation method is:

$\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; \&Integral;</span>}_{\mathrm{<span\; class="notranslate">\; 0</span>}}^{{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; d</span>}\mathrm{<span\; class="notranslate">\; V</span>}$

Among them, Q is the heat released by the battery 2 to be tested, and the unit is KJ (kilojoule) or kWh (kWh); k is the heat exchange coefficient, and the unit is kW h/m ³ °C; Δθ is the heat meter The temperature difference between the inlet and outlet of 152, the unit is ℃ (Celsius); V is the volume flow, the unit is m ³ (cubic meter), v ₁ is the volume flow during the whole measurement process.

When calculating, the heat transfer coefficient is:

k＝(h _f -h _r )/(θ _f -θ _r )/v

Wherein, h _f , h _r are the enthalpy values of the heat-carrying fluid under the inlet and outlet of the heat meter 152 respectively; θ _f , θ _r are the inlet temperature and outlet temperature of the heat meter 152 respectively; v is a specific volume flow rate, where The value and import and export enthalpy can be obtained by referring to the OIML-R75 international regulations and the detailed descriptions in the EN1434 European standard.

The above formula is also the principle formula of the embodiment of the present invention.

The embodiment of the present invention also provides a method for testing battery heat. The method adopts the battery heat testing device of the above-mentioned embodiment, as shown in FIG. 4 , which mainly includes the following steps:

Step 1. Place the battery under test between the water tanks in the adiabatic chamber, and electrically connect the tabs of the battery under test to the electrode connection port;

Step 2, connecting an external charging and discharging device to the electrode connection port;

Step 3, performing initial temperature balance on all parts located in the thermostat;

Step 4, monitor the temperature information of each temperature sensor in real time by computer;

Step 5. When the temperature information of each temperature sensor reaches the initial temperature and stabilizes, monitor and store the temperature information and flow information obtained by the heat meter in real time through the computer;

Step 6, turning on the water pump to drive the circulation of the coolant in the circulation pipeline;

Step 7, turn on the external charging and discharging equipment to charge and discharge the battery under test;

Step 8. Stop the test when the charging and discharging are completed, and the temperature information of each temperature sensor returns to the initial temperature and maintains for a period of time and/or the accumulated calorific value of the heat meter remains constant;

Step 9. Use the accumulated heat value of the heat meter as the heat released by the battery under test during the charging and discharging process.

There are many auxiliary measurement components in the battery heat test device of the above embodiment, these components are mainly used to help keep the temperature in the adiabatic chamber consistent with the temperature in the thermostat before the measurement, combined with the heat measurement process of the entire battery under test, The method embodiment of the present invention further includes the following detailed steps.

Step a, placing the battery under test between the lower water tank and the upper water tank in the adiabatic chamber, and clamping the tab clips to the tabs;

Step b, connecting the main cable of the charging and discharging device to the electrode connection port;

Step c, all parts located in the incubator are exposed to the incubator for initial temperature balance. The exposure process includes opening the adiabatic chamber cover of the adiabatic chamber through computer-controlled switching motors, and the initial temperature of the incubator is set to normal temperature (20 °C), or other temperatures, such as any temperature between -20 °C to 30 °C, preferably normal temperature, monitor the temperature information of the temperature sensors through the computer to ensure that the temperature information of all temperature sensors is all equal to the initial temperature and maintain thermal balance;

Step d. When the temperature information of all the temperature sensors has reached the initial temperature and stabilized, the computer controls the opening and closing motor to close the cover of the heat insulation chamber, and adjust the pressure on the bottom of the upper water tank to the battery under test. The pressure value is collected by the pressure sensor ;

Step e, turn on the water pump to make the coolant circulate through the upper water tank, water pump, heat meter, radiator, heat meter, lower water tank, and upper water tank in sequence, during which the temperature and calorific value of each point are monitored and collected in real time by computer;

Turn on the charging and discharging equipment to charge and discharge the battery;

Step f, when the charging and discharging is completed and the temperature of each temperature sensor returns to the initial temperature and maintains for a period of time and/or when the accumulated heat value of the heat meter is constant, stop the test, read the accumulated heat value of the heat meter or obtain it through the computer The accumulated calorific value is the measured heat released during the charging and discharging process of the battery under test.

The battery heat testing device and the battery heat testing method of the present invention can effectively and accurately measure the heat emitted by the battery under test when it is charged and discharged, so as to actually understand the heating condition of the battery or battery pack, perform effective heat management, and further effectively improve The thermal safety of lithium-ion batteries for electric vehicles provides first-hand reliable information, which is of great significance to the thermal management and thermal safety of electric vehicles.

It should be understood that although this specification is described according to various implementations, not each implementation only includes an independent technical solution. This description of the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions of the feasible implementation modes of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent implementation or Changes, such as combination, division or repetition of features, should be included in the protection scope of the present invention.

Claims (10)

1. A battery heat testing device (1), characterized in that it comprises: Thermostat (11); A thermal insulation chamber (12), the thermal insulation chamber (12) is located in the thermostatic box (11); A water tank group (13), the liquid coolant is filled in the water tank group (13), and the battery under test (2) is clamped, and the water tank group (13) together with the battery under test (2) is placed in the heat-insulating inside the chamber (12); The water pipe group (14), the water pipe group (14) is located in the constant temperature box (11), and the water pipe group (14) combines the water tank group (13), the water pump (151), the heat meter (152), the radiator (153 ) communication, forming from the water tank group (13) through the water pump (151) to the heat meter (152), then from the heat meter (152) to the radiator (153) and by the heat dissipation The device (153) returns to the heat meter (152), and then from the heat meter (152) to the circulation pipeline of the water tank group (13), so that the coolant circulates in the circulation pipeline; a water pump (151), the water pump (151) is located in the thermostatic box (11) and outside the adiabatic chamber (12), and is used to drive the circulation of the liquid coolant in the circulation pipeline; A heat meter (152), the heat meter (152) is located in the constant temperature box (11) and outside the adiabatic chamber (12), and is used to obtain the cumulative heat value of the cooling liquid flowing through the heat meter (152) ; a radiator (153), the radiator (153) is located in the thermostatic box (11) and outside the adiabatic chamber (12), and is used to dissipate the Heat is dissipated in the incubator (11); at least one temperature sensor (161), arranged on the surface of the battery under test (2), for obtaining temperature information on the surface of the battery under test (2); An electrode connection port (17), the electrode connection port (17) is located outside the adiabatic chamber (12) and electrically connected to the pole ear (21) of the battery under test (2), the electrode connection port (17) ) is used to connect external charging and discharging equipment; a computer (19), the computer (19) is located outside the incubator (11), and is connected to the heat meter (152) and at least one temperature sensor (161), and the computer (19) is used to receive the The temperature information obtained by the at least one temperature sensor (161) and the accumulated heat value obtained by the heat meter (152) are received. 2. The battery heat testing device (1) according to claim 1, characterized in that, the battery heat testing device (1) further comprises: A pressure sensor (162), the pressure sensor (162) is located in the adiabatic chamber (12) and connected to the computer (19), the pressure sensor (162) is used to obtain the pressure applied by the water tank group (13) The pressure information of the tested battery (2) is sent to the computer (19) for monitoring. 3. The battery heat testing device (1) according to claim 1, characterized in that, the battery heat testing device (1) further comprises: An electrode heat conduction connector (171), the electrode heat conduction connector (171) is located in the heat insulation chamber (12), and one end of the electrode heat conduction connector (171) is connected to the pole of the battery under test (2). ear (21), the other end of the electrode heat conduction connector (171) is used as the electrode connection port (17), the surface of the electrode heat conduction connector (171) is covered with heat conduction insulating silica gel, and the water tank group (13) is pressed tight to the thermally insulating silicone. 4. The battery heat testing device (1) according to claim 1, characterized in that: The water tank group (13) includes a lower water tank (131) and an upper water tank (132); wherein, The lower water tank (131) is located at the lower side of the tested battery (2), the upper water tank (132) is located at the upper side of the tested battery (2), and the tested battery (2) is located at the Between the lower water tank (131) and the upper water tank (132); The lower water tank (131) and the upper water tank (132) are communicated through a hose, so that the coolant in the lower water tank (131) can enter the upper water tank (132) through the hose; The lower water tank (131) is provided with a water inlet to connect the water pipe group (14), so that the cooling liquid in the water pipe group (14) can flow into the lower water tank (131) through the water inlet; The upper water tank (132) is provided with a water outlet to connect the water pipe group (14), so that the cooling liquid in the upper water tank (132) can flow out of the upper water tank (132) through the water outlet. 5. The battery heat testing device (1) according to claim 4, characterized in that: The adiabatic chamber (12) is provided with through holes adapted to the water inlet and water outlet, so that the water tank group (13) located in the adiabatic chamber (12) and the water pump located outside the adiabatic chamber (12) ( 151), the heat meter (152), and the radiator (153) are communicated through the water pipe group (14). 6. The battery heat testing device (1) according to claim 4, characterized in that, the water pipe group (14) comprises: A water outlet pipe (141), the water outlet pipe (141) is connected between the water outlet of the upper water tank (132) and the water inlet of the water pump (151); A first guide pipe (142), the first guide pipe (142) is connected between the water outlet of the water pump (151) and the water inlet of the heat meter (152); The second guide pipe (143), the second guide pipe (143) is connected between the heat dissipation water delivery port of the heat meter (152) and the water inlet of the radiator (153); The third guide tube (144), the third guide tube (144) is connected between the water outlet of the radiator (153) and the heat dissipation return port of the heat meter (152); A water inlet pipe (145), the water inlet pipe (145) is connected between the water outlet of the heat meter (152) and the water inlet of the lower water tank (131). 7. The battery heat testing device (1) according to claim 1, characterized in that: The at least one temperature sensor (161) is respectively arranged on the surface of the battery under test (2), the tab (21) of the battery under test (2), in the upper water tank (132) and in the lower water tank (131), and Connected to the computer (19), to obtain the surface temperature information of the battery under test (2), the temperature information of the tabs (21) of the battery under test (2), the temperature information in the upper water tank (132) and the lower water tank ( 131) internal temperature information, and send the acquired temperature information to the computer (19). 8. The battery heat testing device (1) according to claim 1, characterized in that: The heat insulation chamber (12) includes a heat insulation chamber body (121) and a heat insulation chamber cover (122); wherein, An accommodating space with an upper opening is formed inside the adiabatic chamber body (121), and the water tank group (13) together with the battery under test (2) is placed in the accommodating space; The heat insulation chamber cover (122) is arranged above the heat insulation chamber body (121), and opens and closes the opening of the accommodation space under the control of an opening and closing motor (125), wherein the opening and closing The motor (125) is electrically connected to the computer (19), so as to perform opening and closing operations of the heat insulation chamber cover (122) under the control of the computer (19). 9. The battery heat testing device (1) according to claim 1, characterized in that: The adiabatic chamber (12) is provided with a vacuum interface (18). 10. A method for performing a battery heat test using the battery heat test device (1) according to any one of claims 1 to 9, comprising: placing the battery under test (2) between the water tank groups (13) in the adiabatic chamber (12), and electrically connecting the tab (21) of the battery under test (2) to the electrode connection port (17); connecting an external charging and discharging device to the electrode connection port (17); All parts located in the incubator (11) carry out initial temperature balance; Monitor the temperature information of each temperature sensor (161) in real time by computer (19); When the temperature information of each temperature sensor (161) has all reached the initial temperature and stabilized, monitor and store the temperature information and flow information acquired by the heat meter (152) in real time through the computer (19); Turn on the water pump (151) to drive the circulation of the coolant in the circulation line; Turn on the external charging and discharging equipment to charge and discharge the battery under test (2); When the charging and discharging is finished, and the temperature information of each temperature sensor (161) all returns to the initial temperature and maintains for a period of time and/or when the cumulative calorific value of the heat meter (152) is constant, stop the test; The accumulated heat value of the heat meter (152) is used as the heat released by the battery (2) under test during the charging and discharging process.