CN111600084A - Equivalent test system and test method for calorific value of battery pack - Google Patents
Equivalent test system and test method for calorific value of battery pack Download PDFInfo
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- CN111600084A CN111600084A CN202010571463.9A CN202010571463A CN111600084A CN 111600084 A CN111600084 A CN 111600084A CN 202010571463 A CN202010571463 A CN 202010571463A CN 111600084 A CN111600084 A CN 111600084A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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
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.
Example one
As shown in fig. 1, an equivalent test system for calorific value of a battery pack comprises a heating device 1, a heat preservation device 2, a charging and discharging device 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 after 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 heat of 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 member 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 then 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;
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. Specifically, the charging and discharging device 3 is electrically connected with the positive electrode and the negative electrode of the battery pack 8, respectively, and the battery pack 8 can generate a large amount of heat in the charging and discharging process; the cooling liquid can take away heat in the battery pack 8 when circulating between the cooling part 4 and the water chilling unit 5, and the water chilling unit 5 can adjust and record the temperature and the flow of the cooling liquid, so that the cooling rate of the battery pack 8 can be adjusted. When the cooling rate and the heat productivity of the battery pack 8 reach a balance, the temperature of the battery pack 8 measured by the first temperature measuring device is kept constant, because the heat preservation cavity 7 is closed by the heat preservation device 2, so that no heat is exchanged between the battery pack 8 and the heating device 1, when the temperature of the battery pack 8 is constant, the heat productivity of the battery pack 8 is equal to the heat exchange amount of the cooling liquid to the battery pack 8, and the heat exchange amount of the cooling liquid to the battery pack 8 per unit time is, wherein 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 is in unit of; is the specific heat of the coolant in units; is the mass flow rate of the cooling liquid in units; the heating value of the battery pack 8 at different temperatures, different charging and discharging multiplying powers and different SOC values can be equivalently measured through the testing system, the efficiency and the accuracy of heating value testing are improved, and the testing cost is reduced.
Specifically, the battery pack 8 may be but not limited to a lithium ion power battery pack, the chiller 5 may include components such as a flow valve, a flow meter, a compressor, an evaporator, and a thermometer, and the specific structure of the chiller 5 is the prior art well known to those skilled in the art, and is not described in detail in this embodiment.
As shown in fig. 1, the heating device 1 may be a high-low temperature test chamber, the heat preservation device 2 may be a heat preservation box, the charging and discharging device 3 may be a charging and discharging machine, and the cooling component 4 may be a liquid cooling plate; specifically, the high-low temperature test chamber, the incubator charging and discharging machine, and the liquid cooling plate are all well known in the art, and are not described in detail in this embodiment.
In the present embodiment, the flatness of the liquid-cooled plate is within 0.5mm, so as to improve the cooling effect on the battery pack 8, and the cooling liquid may be an ethylene glycol aqueous 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 uniformly distributed at 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 positive pole and the negative pole are both connected with the first temperature sensor; in this embodiment, the battery pack 8 may further include a main positive post connected to all the positive posts and a main negative post connected to all the negative posts, the first temperature sensors may not be disposed at positions of the main positive post and the main negative post, and 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.
In this embodiment, a heat conducting glue or a heat conducting pad may be disposed between the cooling component 4 and the battery pack 8, and the heat conducting glue or the heat conducting pad is in full contact with the battery pack 8 and the cooling component 4, respectively, so as to improve the heat exchange efficiency between the battery pack 8 and the cooling component 4; in the present embodiment, the cooling member 4 is attached to the bottom of the battery pack 8.
Example two
A method for testing a system for testing equivalent calorific value of a battery pack according to the first embodiment of the present invention includes the following steps:
s1: charging the battery pack 8 by the charging and discharging device 3 so that the battery pack 8 reaches a specific SOC value P, and attaching the battery pack 8 to the cooling member 4;
s2: placing the battery pack 8 and the cooling part 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 and insulate heat of the battery pack 8;
s3: repeatedly charging and discharging the battery pack 8 through the charging and discharging equipment 3, 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 at the moment, 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 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 ℃/30min, the temperature of the battery pack 8 is kept constant;
s4: calculating the heat generation amount of the battery pack 8 per unit time; wherein, the specific heat of the cooling liquid is used. Because the heat preservation device 2 preserves and insulates the battery pack 8, so that no heat is exchanged between the battery pack 8 and the heating device 1, when the temperature of the battery pack 8 is constant, the heat generation amount of the battery pack 8 is equal to the heat exchange amount of the cooling liquid to the battery pack 8. The heat exchange quantity of the cooling liquid to the battery pack 8 in unit time is equal, so that the heat productivity of the battery pack 8 in unit time can be obtained, the efficiency and the accuracy of heat productivity testing are greatly improved, and the testing cost is reduced.
As shown in fig. 1, the steps of the method may further include:
s0: the liquid outlet of the water chilling unit 5 is connected with the inlet of the cooling part 4 through the liquid outlet pipe 9, the liquid inlet of the water chilling unit 5 is connected with the outlet of the cooling part 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, the first temperature measuring device is connected to the battery pack 8, and the battery pack 8 is electrically connected with the charging and discharging equipment 3. Specifically, the step of connecting the first temperature measuring device to the battery pack 8 in step S0 is to uniformly arrange the first temperature sensors in the first temperature measuring device on the bottom of the battery pack 8, the positive pole and the negative pole so as to detect the temperature of the battery pack 8.
In this embodiment, the step S1 of attaching the battery pack 8 to the cooling member 4 specifically 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 through the thermally conductive adhesive or the thermally conductive pad. The specific step of repeatedly charging and discharging the battery pack 8 in step S3 is to charge the battery pack 8 at a constant current for a specific time t at a specific charging and discharging magnification M, and then discharge the battery pack 8 at the same magnification M for the same time t, so that the charging and discharging are repeated; specifically, the specific charge/discharge magnification M is generally not less than 0.3C, and the specific time t may be 10 s. In the present embodiment, by changing the values of the specific temperature T, the specific charge and discharge rate M, and the specific SOC value P, the heat generation amount of the battery pack 8 at different temperatures, different charge and discharge rates, and different SOC values can be tested.
The working principle of the invention is as follows:
the liquid outlet of the water chilling unit 5 is connected with the inlet of the cooling part 4 through the liquid outlet pipe 9, the liquid inlet of the water chilling unit 5 is connected with the outlet of the cooling part 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 uniformly arranged at the bottom of the battery pack 8, the positive pole column and the negative pole column, so that the temperature of the battery pack 8 is detected, and the battery pack 8 is electrically connected with the charging and discharging equipment 3.
Then charging the battery pack 8 by the charging and discharging device 3 so that the battery pack 8 reaches a specific SOC value P, and attaching the battery pack 8 to the cooling member 4; the battery pack 8 and the cooling part 4 are put into the heat retaining device 2, the battery pack 8 is heated to a specific temperature T by the heating device 1, and then the heat retaining device 2 is closed to retain and insulate the battery pack 8. Charging the battery pack 8 at a constant current for a specific time t at a specific charging and discharging multiplying power M, and then discharging the battery pack 8 at the same multiplying power M at the constant current for the same time t, so that the charging and the discharging are repeated; simultaneously starting the water chilling unit 5 and adjusting the flow and temperature of the cooling liquid in the water chilling unit 5 so as to keep the temperature of the battery pack 8 constant; and recording the flow rate of the cooling liquid in the water chilling unit 5 at the moment, 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 pipe 9 and the liquid return pipe 10. Wherein, because the heat preservation device 2 preserves heat of the battery pack 8, so that no heat is exchanged between the battery pack 8 and the heating device 1, when the temperature of the battery pack 8 is constant, the heating value of the battery pack 8 is equal to the heat exchange amount of the cooling liquid to the battery pack 8. The heat exchange quantity of the cooling liquid to the battery pack 8 in unit time is the specific heat of the cooling liquid, so that the heat productivity of the battery pack 8 in unit time can be obtained, the efficiency and the accuracy of the heat productivity test are greatly improved, and the test cost is reduced. And by changing the 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 8 at different temperatures, different charge and discharge multiplying factors and different SOC values can be tested.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Claims (10)
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.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112864488A (en) * | 2021-01-12 | 2021-05-28 | 上海派能能源科技股份有限公司 | Energy storage liquid cooling system device and control method thereof |
| CN113009369A (en) * | 2021-03-18 | 2021-06-22 | 奇瑞新能源汽车股份有限公司 | Method and device for testing cycle durability of power battery |
| CN113805070A (en) * | 2021-08-23 | 2021-12-17 | 合肥国轩高科动力能源有限公司 | Device and method for testing adiabatic temperature rise in battery charging and discharging process at low temperature |
| CN116068417A (en) * | 2022-12-05 | 2023-05-05 | 江苏拓米洛高端装备股份有限公司 | Battery heating value determining method and device and test box |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112864488A (en) * | 2021-01-12 | 2021-05-28 | 上海派能能源科技股份有限公司 | Energy storage liquid cooling system device and control method thereof |
| CN113009369A (en) * | 2021-03-18 | 2021-06-22 | 奇瑞新能源汽车股份有限公司 | Method and device for testing cycle durability of power battery |
| CN113805070A (en) * | 2021-08-23 | 2021-12-17 | 合肥国轩高科动力能源有限公司 | Device and method for testing adiabatic temperature rise in battery charging and discharging process at low temperature |
| CN116068417A (en) * | 2022-12-05 | 2023-05-05 | 江苏拓米洛高端装备股份有限公司 | Battery heating value determining method and device and test box |
| CN116068417B (en) * | 2022-12-05 | 2023-12-29 | 江苏拓米洛高端装备股份有限公司 | Battery heating value determining method and device and test box |
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