阅读说明：本技术 电池组发热量等效测试系统及测试方法 (Equivalent test system and test method for calorific value of battery pack ) 是由 陈通 王海燕 曹开强 于 2020-06-22 设计创作，主要内容包括：本发明公开了一种电池组发热量等效测试系统及测试方法,它包括加热装置、保温装置、充放电设备、冷却部件、冷水机组、第一测温装置和第二测温装置；所述加热装置中设有加热腔,所述保温装置位于所述加热腔中并设有用于放置所述电池组和所述冷却部件的保温腔；所述充放电设备与所述电池组相连并用于对所述电池组进行充放电；所述冷却部件用于直接或间接地贴合在所述电池组上,所述冷水机组的出液口通过出液管与所述冷却部件的入口相连,所述冷水机组的进液口通过回液管与所述冷却部件的出口相连。本发明能够通过冷却液换热量等效测试出电池组的发热量,能够测试电池组在不同温度下的发热量,能够提高测试的效率和准确度,降低测试的成本。(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.)

1. An equivalent test system for calorific capacity of a battery pack is characterized by comprising a heating device (1), a heat preservation device (2), charging and discharging equipment (3), a cooling part (4), a water chilling unit (5), a first temperature measuring device and a second temperature measuring device; wherein the content of the first and second substances,

a heating cavity (6) is arranged in the heating device (1);

the heat preservation device (2) is positioned in the heating cavity (6) and is provided with a heat preservation cavity (7) for placing the battery pack (8) and the cooling component (4), so that when the heating device (1) heats the battery pack (8) to a specific temperature, the heat preservation device (2) closes the heat preservation cavity (7) to preserve heat and insulate the battery pack (8);

the charging and discharging equipment (3) is connected with the battery pack (8) and is used for charging and discharging the battery pack (8);

the cooling component (4) is used for directly or indirectly attaching to the battery pack (8);

a liquid outlet of the water chilling unit (5) is connected with an inlet of the cooling part (4) through a liquid outlet pipe (9), a liquid inlet of the water chilling unit (5) is connected with an outlet of the cooling part (4) through a liquid return pipe (10), and the water chilling unit (5) is used for accessing cooling liquid flowing out of the cooling part (4), cooling the cooling liquid and conveying the cooling liquid to the cooling part (4);

the first temperature measuring device is connected with the battery pack (8) and is used for measuring the temperature of the battery pack (8);

and the second temperature measuring device is respectively connected with the liquid outlet pipe (9) and the liquid return pipe (10) and is used for measuring the temperature of the cooling liquid in the liquid outlet pipe (9) and the liquid return pipe (10).

2. The equivalent test system of calorific power of battery packs according to claim 1, characterized in that said heating means (1) is a high-low temperature test chamber, and/or said thermal insulation means (2) is a thermal insulation chamber, and/or said charge and discharge device (3) is a charge and discharge machine, and/or said cooling means (4) is a liquid cooling plate.

3. The battery pack calorific power equivalence test system of 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 power equivalence test 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 equivalent test system of battery pack calorific value 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 first temperature sensor is connected to both the positive pole and the negative pole.

6. The equivalent test system for battery heating value according to claim 1, wherein the second temperature measuring device comprises 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).

7. The battery pack calorific value equivalence test system according to claim 1, wherein a heat conducting glue or a heat conducting pad is provided between the cooling member (4) and the battery pack (8).

8. A test method of a battery pack heat generation equivalent test system according to any one of claims 1 to 7, characterized in that the method comprises the following steps:

s1: -charging the battery pack (8) by means of the charging and discharging device (3) so that the battery pack (8) reaches a specific SOC value P, the battery pack (8) being attached to the cooling member (4);

s2: placing the battery pack (8) and the cooling component (4) into the heat preservation device (2), heating the battery pack (8) to a specific temperature T through the heating device (1), and then closing the heat preservation device (2) to preserve heat and insulate the battery pack (8);

s3: repeatedly charging and discharging the battery pack (8), starting the water chilling unit (5) and adjusting the flow and the temperature of cooling liquid in the water chilling unit (5) so as to keep the temperature of the battery pack (8) constant; recording the flow of the cooling liquid in the water chilling unit (5), measuring 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 calculating the temperature difference of the cooling liquid in the liquid outlet pipe (9) and the liquid return pipe (10);

s4: calculating the heat generation amount of the battery pack (8) per unit time; wherein, the specific heat of the cooling liquid is used.

9. The method of claim 8, further comprising the steps of:

s0: will through drain pipe (9) the liquid outlet of cooling water set (5) with the entry of cooling part (4) links to each other, will through returning liquid pipe (10) the inlet of cooling water set (5) with the export of cooling part (4) links to each other, will second temperature measuring device with drain pipe (9) and liquid pipe (10) are connected back, are connected first temperature measuring device in on group battery (8), will group battery (8) with charging and discharging equipment (3) electric connection.

10. The test method according to claim 8,

the step S1 of attaching the battery pack (8) to the cooling member (4) includes attaching a thermally conductive adhesive or a thermally conductive pad to at least one of the battery pack (8) and the cooling member (4), and attaching the battery pack (8) to the cooling member (4) via the thermally conductive adhesive or the thermally conductive pad;

and/or the specific step of repeatedly charging and discharging the battery pack (8) in the step S3 is to charge the battery pack (8) at a constant current for a specific time t at a specific charging and discharging rate M, and then discharge the battery pack (8) at the same constant current for the same time t at the same rate M, thus repeatedly charging and discharging.

Technical Field

The invention relates to a battery pack heat productivity equivalent test system and a battery pack heat productivity equivalent test method.

Background

Under the pressure that the energy crisis is continuously deepened and the environmental problems are increasingly highlighted, the electric automobile is rapidly developed by the characteristics of low carbon, energy conservation and environmental protection. The battery is used as an energy unit and a key component of the electric automobile, and directly influences the performance of the electric automobile. The battery generates a large amount of heat during charging and discharging, and the accumulation of the heat seriously affects the performance, safety and service life of the battery.

At present, the calorific value of the battery is generally estimated through the internal resistance of the battery in the industry, but the internal resistance of the battery has large variation along with the change of charge-discharge multiplying power, temperature and SOC value, and an accurate value is difficult to determine. The industry also depends on an accelerated adiabatic calorimeter to test the heat release quantity of the battery, but the accelerated adiabatic calorimeter cannot test the heat release quantity of the battery at a specific temperature, and the accelerated adiabatic calorimeter is expensive.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a battery pack heat productivity equivalent test system, which can equivalently test the heat productivity of the battery pack through the heat exchange quantity of cooling liquid, can test the heat productivity of the battery pack at different temperatures, can improve the test efficiency and accuracy and reduce the test cost.

In order to solve the technical problems, the technical scheme of the invention is as follows: an equivalent test system for calorific capacity of a battery pack comprises a heating device, a heat preservation device, charging and discharging equipment, a cooling part, a water chilling unit, a first temperature measuring device and a second temperature measuring device; wherein the content of the first and second substances,

a heating cavity is arranged in the heating device;

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 component, so that after the heating device heats the battery pack to a specific temperature, the heat preservation device closes the heat preservation cavity to preserve and insulate heat of the battery pack;

the charging and discharging equipment is connected with the battery pack and is used for charging and discharging the battery pack;

the cooling component 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, a liquid inlet of the water chilling unit is connected with an outlet of the cooling part through a liquid return pipe, and the water chilling unit is used for accessing cooling liquid flowing out of the cooling part, cooling the cooling liquid and conveying the cooling liquid to the cooling part;

the first temperature measuring device is connected with the battery pack and is used for measuring the temperature of the battery pack;

and 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-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 part is a liquid cooling plate.

Further in order to 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.

The specific scheme of the first temperature measuring device is further provided, and the first temperature measuring device comprises a plurality of first temperature sensors connected to the battery pack.

Further, the battery pack comprises at least one battery monomer, the battery monomer is provided with a positive pole column and a negative pole column, and the positive pole column and the negative pole column are both connected with the first temperature sensor.

The liquid outlet pipe and the liquid return pipe are respectively connected with at least one second temperature sensor.

Further in order to improve the heat exchange efficiency between the cooling component and the battery pack, a heat-conducting glue or a heat-conducting pad is arranged between the cooling component and the battery pack.

The invention also provides a testing method of the battery pack calorific capacity equivalent testing system, which comprises the following steps:

s1: charging the battery pack by the charging and discharging device so that the battery pack reaches a specific SOC value P, and attaching the battery pack to the cooling member;

s2: putting the battery pack and the cooling component into the heat preservation device, heating the battery pack to a specific temperature T through the heating device, and then closing the heat preservation device to preserve and insulate heat of the battery pack;

s3: repeatedly charging and discharging the battery pack, starting the water chilling unit and adjusting the flow and the temperature of cooling liquid in the water chilling unit so as to keep the temperature of the battery pack constant; recording the flow of the cooling liquid in the water chilling unit at the moment, measuring the temperature of the cooling liquid in the liquid outlet pipe and the liquid return pipe through the second temperature measuring device, and then calculating the temperature difference of the cooling liquid in the liquid outlet pipe and the liquid return pipe;

s4: calculating the heat generation amount of the battery pack in unit time; wherein, the specific heat of the cooling liquid is used.

Further, the method comprises the following steps:

s0: the liquid outlet of the water chilling unit is connected with the inlet of the cooling part through the liquid outlet pipe, the liquid inlet of the water chilling unit is connected with the outlet of the cooling part through the liquid return pipe, the second temperature measuring device is connected with 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 with the charging and discharging equipment.

Further, the step S1 of attaching the battery pack to the cooling member includes attaching a thermally conductive adhesive or a thermally conductive pad to at least one of the battery pack and the cooling member, and attaching the battery pack to the cooling member via the thermally conductive adhesive or the thermally conductive pad;

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

After the technical scheme is adopted, the liquid outlet of the water chilling unit is connected with the inlet of the cooling part through the liquid outlet pipe, the liquid inlet of the water chilling unit is connected with the outlet of the cooling part through the liquid return pipe, the second temperature measuring device is connected with the liquid outlet pipe and the liquid return pipe, and the first temperature sensors in the first temperature measuring device are uniformly arranged on the bottom, the positive pole and the negative pole of the battery pack so as to detect the temperature of the battery pack, and the battery pack is electrically connected with the charging and discharging equipment.

Then charging the battery pack through the charging and discharging equipment so that the battery pack reaches a specific SOC value P, and attaching the battery pack to the cooling component; and putting the battery pack and the cooling component into the heat preservation device, heating the battery pack to a specific temperature T through the heating device, and then closing the heat preservation device to preserve and insulate the heat of the battery pack. Charging the battery pack for a certain time t at a constant current by a certain charging and discharging multiplying power M, and then discharging the battery pack for the same time t at the same multiplying power M, and repeating the charging and discharging; simultaneously starting the water chilling unit and adjusting the flow and the temperature of cooling liquid in the water chilling unit so as to keep the temperature of the battery pack constant; and recording the flow of the cooling liquid in the water chilling unit at the moment, measuring the temperature of the cooling liquid in the liquid outlet pipe and the liquid return pipe through the second temperature measuring device, and then calculating the temperature difference of the cooling liquid in the liquid outlet pipe and the liquid return pipe. The battery pack is heated and insulated by the heat preservation device, so that no heat is exchanged between the battery pack and the heating device, and when the temperature of the battery pack is constant, the heat productivity of the battery pack is equal to the heat exchange quantity of the cooling liquid to the battery pack. The heat exchange quantity of the cooling liquid to the battery pack in unit time is the specific heat of the cooling liquid, so that the heat productivity of the battery pack in unit time can be obtained, the efficiency and the accuracy of heat productivity testing are greatly improved, and the testing cost is reduced. And by changing the numerical values of the specific temperature T, the specific charge and discharge multiplying factor M and the specific SOC value P, the calorific value of the battery pack under different temperatures, different charge and discharge multiplying factors and different SOC values can be tested.

Drawings

Fig. 1 is a schematic structural diagram of a battery pack calorific value equivalence test system according to the present invention.

Detailed Description

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.