CN108344946B - Battery heating value testing method and battery heating value testing device - Google Patents
Battery heating value testing method and battery heating value testing device Download PDFInfo
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- CN108344946B CN108344946B CN201710053911.4A CN201710053911A CN108344946B CN 108344946 B CN108344946 B CN 108344946B CN 201710053911 A CN201710053911 A CN 201710053911A CN 108344946 B CN108344946 B CN 108344946B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 231
- 238000012360 testing method Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 claims abstract description 49
- 238000007599 discharging Methods 0.000 claims description 118
- 238000007600 charging Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 18
- 230000020169 heat generation Effects 0.000 claims description 17
- 230000010354 integration Effects 0.000 claims description 17
- 210000002268 wool Anatomy 0.000 claims description 11
- 238000010998 test method Methods 0.000 claims description 10
- 206010028980 Neoplasm Diseases 0.000 claims 1
- 201000011510 cancer Diseases 0.000 claims 1
- 208000028659 discharge Diseases 0.000 abstract description 50
- 230000000694 effects Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000012544 monitoring process Methods 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000008213 purified water Substances 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000652 nickel hydride Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
Abstract
The utility model relates to a battery heating value testing method and a battery heating value testing device, which are characterized in that firstly, a battery to be tested is subjected to discharge treatment, then the battery to be tested is subjected to heating treatment by preset heating power, meanwhile, temperature information of the battery to be tested in the discharge and heating processes is respectively obtained through a temperature measuring device, and then the integral area of the excess temperature of the battery to be tested in the discharge and heating processes is obtained according to the change of the temperature of the battery to be tested in the discharge and heating processes along with time, so that the heating value of the battery to be tested in the discharge process is obtained according to the integral area of the excess temperature of the battery to be tested and the preset heating power. The battery heating value testing method and device provided by the utility model have the advantages of simple structure, quick test, reliable testing effect, high efficiency, practicability, low process requirements, low testing cost, better engineering practice significance and wide popularization and application value.
Description
Technical Field
The utility model relates to the technical field of storage batteries, in particular to a battery heating value testing method and a battery heating value testing device.
Background
The storage battery, such as a nickel-hydrogen storage battery, is widely applied to a satellite system, and because of the heating characteristic of the storage battery in the working process, in the satellite control system, thermal control measures are often required to be adopted for important parts in the satellite, such as the nickel-hydrogen storage battery, so that the proper working temperature of the nickel-hydrogen storage battery is ensured to prolong the service life. The heat productivity of the storage battery such as nickel-hydrogen battery is often changed along with the change of the discharge current, so that the heat productivity of the storage battery needs to be measured when effective heat control measures are carried out. In the prior art, an adiabatic method is generally adopted for measuring the heating value of a storage battery such as nickel hydride and the like, and the adiabatic method requires that the test is performed under an approximately adiabatic environment (such as an adiabatic cylinder, an adiabatic chamber and the like) created in a vacuum tank.
For example, chinese patent application CN201510868096 discloses a battery heat testing device and a battery heat testing method, the battery heat testing method comprising: placing the battery to be tested between water tank groups in the heat-insulating chamber, and electrically connecting lugs of the battery to be tested to the electrode connecting port; connecting an external charge-discharge device to the electrode connection port; all components located within the oven perform an initial temperature balance; monitoring the temperature information of each temperature sensor in real time through a computer; when the temperature information of each temperature sensor completely reaches the initial temperature and is stable, the temperature information and the flow information acquired by the heat meter are monitored and stored in real time by a computer (the water pump is started to drive the circulation of the coolant in the circulation pipeline, the external charge and discharge equipment is started to charge and discharge the battery to be tested, when the charge and discharge are finished, the temperature information of each temperature sensor completely returns to the initial temperature and is maintained for a period of time and/or the accumulated heat value of the heat meter is constant, the test is stopped, and the accumulated heat value of the heat meter is used as the heat released by the battery to be tested in the charge and discharge process.
For example, chinese patent application CN201210500019 discloses a method for testing thermal performance of a lithium ion battery, which includes the following steps: the first step: fully charging the battery, cooling, putting the battery into an incubator, converting the temperature of the incubator according to the preset temperature and time interval, and detecting the open-circuit voltage Uoc and the surface temperature of the battery in real time; and a second step of: performing discharging operation at room temperature with preset current until the electric quantity of the battery is discharged to a preset state of charge (SOC); and a third step of: detecting the open-circuit voltage and the surface temperature of the battery at different discharging time points in real time until the state of charge (SOC) of the battery is equal to zero, and calculating to obtain the actual open-circuit voltage Uoc of the battery; fourth step: calculating an actual open-circuit voltage temperature coefficient B of the battery according to the open-circuit voltage and the battery surface temperature of the battery at different discharging time points; fifth step: discharging the fully charged battery, and detecting the battery working voltage U and the battery surface temperature T at different discharging time points in real time; sixth step: and calculating the heating power P of the battery at different discharging time points according to a preset heating power calculation formula. The method for testing the thermal performance of the lithium ion battery provided by the patent document needs multiple curve fitting, and has various problems of complex testing steps, long testing time and the like.
For example, chinese patent publication CN201320409816 discloses a device for measuring specific heat capacity and heat productivity of a battery, which includes a battery to be measured, and battery tabs are disposed on two sides of the battery to be measured; the battery to be tested is arranged in the outer shell; and a temperature sensor penetrating into the inside of the outer case through the penetration hole. In addition, the outer shell of the device is divided into an upper shell and a lower shell, wherein the upper shell is used for sealing a test environment, and the lower shell is used for placing a solvent with known specific heat capacity and a battery to be tested. The lower shell is internally provided with a plurality of purified water, and the battery to be tested is buried on the purified water surface. The temperature change of purified water was measured by inserting a temperature probe into the outer case. The specific method for testing the heat productivity of the battery to be tested by adopting the device is as follows: the battery to be tested is put into the device, the water temperature is recorded after the battery to be tested is stabilized for 16 to 24 hours, the temperature of purified water is tested and recorded, and the charge and discharge leads are respectively connected to the positive and negative battery lugs. The temperature and the water temperature of the battery to be measured can be slowly increased due to heat generated by internal resistance and chemical reaction in the charging and discharging process of the battery, the water temperature change is recorded, and the temperature is recorded when the water temperature area is stable, namely the heat productivity of the battery to be measured in the charging and discharging process is equal to the heat generated by the temperature increase of the battery and the heat generated by the pure water temperature increase. The device for measuring the specific heat capacity and the heating value of the battery provided by the patent document has simple structure and easy operation, and can conveniently measure the specific heat capacity of the battery and the heating value of the battery in the charging and discharging processes. However, the device requires more than 16 hours for measuring the heat productivity of the battery, and has the problems of long testing time, high testing cost, low testing efficiency and the like
In summary, how to simply, quickly and inexpensively test the heat productivity of a battery in an operating state is one of the problems to be solved in the art.
Disclosure of Invention
In order to solve the above problems, the present utility model is directed to a quick, simple and low-cost test method and test device for battery heating value.
In order to achieve the above object, the present utility model provides a method for testing the heat productivity of a battery, comprising the steps of:
a discharging step, after the temperature of the battery to be measured is adjusted to an initial temperature, discharging the battery to be measured, and detecting and recording the discharging temperature and the corresponding discharging time of the battery to be measured in the discharging process in real time;
a cooling step of cooling the temperature of the battery to be measured from the discharge temperature to an initial temperature;
heating the battery to be measured with preset heating power, and detecting and recording the heating temperature and the corresponding heating time of the battery to be measured in the heating process in real time;
and calculating, namely calculating the heating value of the battery to be tested in discharging according to the initial temperature, the discharging time, the discharging temperature, the heating time, the heating temperature and the preset heating power.
Further, the calculating step specifically includes:
calculating an integral area, namely calculating a first temperature integral area of the excess temperature of the battery to be measured in the discharging process according to the initial temperature, the discharging time and the discharging temperature, and calculating a second temperature integral area of the excess temperature of the battery to be measured in the heating process according to the initial temperature, the heating time and the heating temperature;
and calculating the heating value, namely calculating the heating value of the battery to be tested during discharging according to the first temperature integral area, the second temperature integral area and the preset heating power.
Preferably, in the integral area calculation, the first temperature integral area S Battery cell And a second temperature integration area S Heater The calculation is performed according to the following formula:
τ＝τ 1 -τ 0 ，θ＝T 1 -T 0 ；
τ’＝τ 2 -τ 0’ ，θ′＝T 2 -T 0 ；
wherein T is 0 For an initial temperature τ 1 For the discharge end time of the battery to be tested, τ 0 For the discharge starting time of the battery to be tested, T 1 For the temperature at the end of the discharge of the battery to be measured, τ 2 For the heating end time of the battery to be measured, τ 0’ T is the heating starting time of the battery to be tested 2 And the temperature at the heating end time of the battery to be measured.
Further, in the calorific value calculation, the calorific value Q is calculated according to the following formula:
wherein Q is Heater Is preset heating power, and S Battery cell And S is equal to Heater In the calculation of (c), τ=τ'.
Preferably, the discharging step is preceded by: and a charging step, wherein the battery to be tested is charged.
Further, after the charging step, the method further includes: and cooling, namely cooling the battery to be tested after the battery to be tested is charged, so as to adjust the temperature of the battery to be tested to the initial temperature.
Preferably, in the discharging step, the battery to be measured is discharged at a constant current value.
The utility model also provides a device for testing the heating value of the battery, which comprises:
the charging and discharging equipment is connected with the battery to be tested and charges or discharges the battery to be tested;
the heating equipment is arranged on the surface of the battery to be tested and is used for heating the battery to be tested with preset heating power;
the temperature measuring equipment is connected with the battery to be measured and used for detecting and recording initial temperature, charging temperature, discharging temperature or heating temperature in the charging, discharging or heating process of the battery to be measured in real time and corresponding charging time, discharging time or heating time in real time;
the core processor is connected with the temperature measuring equipment and used for calculating the heating value of the battery to be measured in discharging according to the initial temperature, the discharging time, the discharging temperature, the heating time, the heating temperature and the preset heating power.
Further, the core processor further includes:
the integrated area calculation unit is used for calculating a first temperature integrated area of the excessive temperature of the battery to be measured in the discharging process according to the initial temperature, the discharging time and the discharging temperature, and calculating a second temperature integrated area of the excessive temperature of the battery to be measured in the heating process according to the initial temperature, the heating time and the heating temperature;
and the heating value calculation unit is used for calculating the heating value of the battery to be tested when discharging according to the first temperature integration area, the second temperature integration area and the preset heating power.
Preferably, in the integrated area calculation unit, the first temperature integrated area S Battery cell And a second temperature integration area S Heater The calculation is performed according to the following formula:
τ＝τ 1 -τ 0 ，θ＝T 1 -T 0 ；
τ’＝τ 2 -τ 0’ ，θ′＝T 2 -T 0 ；
wherein T is 0 For an initial temperature τ 1 For the discharge end time of the battery to be tested, τ 0 For the discharge starting time of the battery to be tested, T 1 For the temperature at the end of the discharge of the battery to be measured, τ 2 For the heating time of the battery to be measured, tau 0’ T is the heating starting time of the battery to be tested 2 And the temperature at the heating end time of the battery to be measured.
Further, in the heat generation amount calculation unit, the heat generation amount Q is calculated according to the following formula:
wherein Q is Heater Is preset heating power, and S Battery cell And S is equal to Heater In the calculation of (c), τ=τ'.
Further, the constant temperature device is used for placing the battery to be measured in the constant temperature device so as to adjust the battery to be measured to be always in the ambient environment with constant temperature.
Preferably, the thermostatic device is provided with at least one outlet opening.
Further, battery lugs are arranged on two sides of the battery to be tested.
Preferably, the battery to be tested comprises a charge-discharge wire, and the charge-discharge wire is connected with the battery tab and extends out of the lead-out hole to be connected to the charge-discharge equipment.
Further, the device also comprises wool felt for wrapping the battery to be tested.
As described above, the battery heating value testing method and device provided by the utility model have the advantages of simple structure, quick testing, reliable testing effect, high efficiency, practicality, low process requirements, low testing cost, good engineering practice significance and wide popularization and application value.
In order to make the above-mentioned objects of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The following detailed description of the utility model refers to the accompanying drawings.
FIG. 1 is a flow chart of a method for testing the heat generation of a battery according to a preferred embodiment of the present utility model;
FIG. 2 is a flow chart of a method for testing the heat generation of a battery according to another preferred embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a battery heating value testing device according to another preferred embodiment of the present utility model.
Description of element reference numerals
1. Battery to be measured
2. Constant temperature equipment
3. Heating apparatus
4 charge and discharge device
5. Wool felt
6. Temperature measuring equipment
11. Charge-discharge wire
21. Extraction hole
22. Data transmission line
Detailed Description
Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present utility model with specific examples. While the description of the utility model will be presented in connection with a preferred embodiment, it is not intended to limit the inventive features to that embodiment. Rather, the purpose of the utility model described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the utility model. The following description contains many specific details for the purpose of providing a thorough understanding of the present utility model. The utility model may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the utility model.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The terms "upper", "lower", "left", "right", "top" and "bottom" used in the following description are not to be construed as limiting the present utility model.
As shown in fig. 1, a battery heating value test method provided in a preferred embodiment of the present utility model includes a discharging step S10, a cooling step S11, a heating step S12, and a calculating step S13. Specifically, in the discharging step S10, after the temperature of the battery to be measured is adjusted to the initial temperature, the battery to be measured is subjected to discharging treatment, and the discharging temperature and the corresponding discharging time of the battery to be measured in the discharging process are detected and recorded in real time; in a cooling step S11, the temperature of the battery to be measured is cooled from the discharge temperature to an initial temperature; in the heating step S12, heating the battery to be measured with preset heating power, and detecting and recording the heating temperature and the corresponding heating time of the battery to be measured in the heating process in real time; in the calculating step S13, the heat generation amount of the battery to be measured at the time of discharging is calculated from the initial temperature, the discharging time, the discharging temperature, the heating time, the heating temperature, and the preset heating power.
Specifically, in the discharging step S10, after the temperature of the battery to be measured is adjusted to the initial temperature, the battery to be measured is discharged, and the discharging temperature and the corresponding discharging time of the battery to be measured in the discharging process are detected and recorded in real time.
Before the battery to be tested is discharged, the temperature of the battery to be tested is first adjusted to an initial temperature, and the initial temperature is recorded. After the adjustment is finished, the battery to be tested is discharged with a certain current value. Preferably, the battery to be measured is subjected to discharge treatment with a constant current value, and the discharge temperature in the discharge process and the discharge time corresponding to the discharge temperature are recorded in real time. Of course, the end time of the discharging of the battery to be tested may be the time when the electric quantity of the battery to be tested is exhausted, but in order to shorten the testing time and the cost and improve the testing efficiency, in the method for testing the heat productivity of the battery provided in the preferred embodiment, a certain predetermined time length is used as the discharging time length of the battery to be tested, for example, the discharging time length is controlled to be 1 hour, 2 hours, 3 hours or 30 minutes, 50 minutes, and so on. Further, in order to avoid radiation heat leakage of the battery to be tested in the discharging process, in the method for testing the heat productivity of the battery provided by the preferred embodiment of the utility model, preferably, the battery to be tested is wrapped by wool felt, the wrapped battery to be tested is placed in the constant temperature equipment, and meanwhile, the temperature in the constant temperature equipment is controlled to be constant, and further, in the preferred embodiment, the temperature is controlled to be initial temperature. Specifically, the constant temperature equipment adopts the high-low temperature box, the convection intensity in the high-low temperature box is stronger, the constant temperature can be kept, the temperature difference between the outer surface temperature of the wool felt and the temperature of the high-low temperature box is small, and the radiation heat leakage in the discharging process of the battery to be tested can be reduced, so that the accuracy of the battery heating value test in the discharging process is ensured. The initial temperature and the temperature in the constant temperature equipment can be set to any values according to actual needs, and the temperature in the constant temperature equipment can be kept unchanged in the whole discharging or heating process.
In the cooling step S11, after the discharge of the battery to be measured is completed, the temperature of the battery to be measured is cooled to the initial temperature. In this case, the battery to be tested often generates heat during discharging to raise its temperature, so in order to ensure the accuracy of the test result during heating, in the method for testing the heat productivity of the battery provided in the preferred embodiment, before the battery to be tested is subjected to heating, the battery to be tested is subjected to cooling treatment to adjust its temperature to the initial temperature, so as to ensure the accuracy of the measurement result.
In the heating step S12, the battery to be measured is heated with a preset heating power, and the heating temperature and the corresponding heating time of the battery to be measured in the heating process are detected and recorded in real time.
Specifically, after the battery to be measured is discharged and the temperature is restored to the initial temperature, the battery to be measured is heated by a certain heating power, and the heating temperature of the battery to be measured and the heating time corresponding to the temperature in the process are detected and recorded at the same time, and the heating power can be arbitrarily selected according to actual needs as long as the heating power meets the basic performance of the battery to be measured.
In the calculating step S13, the heat generation amount of the battery to be measured at the time of discharging is calculated from the initial temperature, the discharging time, the discharging temperature, the heating time, the heating temperature, and the preset heating power. Specifically, the calculation step S13 includes an integration area calculation S131 and a heat generation amount calculation S132.
Further, in the integral area calculation S131, a first temperature integral area of the excess temperature of the battery to be measured in the discharging process is calculated according to the initial temperature, the discharging time and the discharging temperature, and a second temperature integral area of the excess temperature of the battery to be measured in the heating process is calculated according to the initial temperature, the heating time and the heating temperature.
In the heat generation amount calculation S132, the heat generation amount of the battery to be measured at the time of discharging is calculated from the first temperature integration area, the second temperature integration area, and the preset heating power.
Further, in the integrated area calculation S131, the first temperature integrated area S Battery cell And a second temperature integration area S Heater The calculation is performed according to the following formula:
τ＝τ 1 -τ 0 ，θ＝T 1 -T 0 ；
τ’＝τ 2 -τ 0’ ，θ′＝T 2 -T 0 ；
wherein T is 0 For an initial temperature τ 1 For the discharge end time of the battery to be tested, τ 0 For the discharge starting time of the battery to be tested, T 1 For the temperature at the end of the discharge of the battery to be measured, τ 2 For the heating end time of the battery to be measured, τ 0’ T is the heating starting time of the battery to be tested 2 And the temperature at the heating end time of the battery to be measured.
In the heat generation amount calculation S132, the heat generation amount Q is calculated according to the following formula:
wherein Q is Heater Is preset heating power, and S Battery cell And S is equal to Heater In the calculation of (c), τ=τ'.
Specifically, in taking a battery to be tested as a research object, the following thermal equilibrium equation can be established by applying the first law of thermodynamics:
qdτ＝Cdθ+hθdτ
θ＝t-t 0
wherein q is heating power, W; τ is time, s; c is heat capacity, J/K; θ is excess temperature, K; t is t 0 The initial temperature, K; t is the temperature of the battery to be measured at the discharge end time; h is the total heat transfer coefficient. By arranging the above equations, it is possible to obtain:
where a is the end time. The above formula shows that under the condition that the heating time is consistent, the heat exchange coefficient and the heat capacity of the battery are unchanged, the integral area S of the excess temperature is in direct proportion to the heating value q. Therefore, when the battery to be measured is heated by the heating device, the following relational expression is satisfied:
S 1 /q 1 ＝S 2 /q 2 ＝...＝S n /q n
that is, the excess temperature integrated area S of any one battery to be tested is known within the same period Heater Heating power q Heater The battery to be tested is at constant electricityExcess temperature integral area S under discharge flow Battery cell The average heating value Q of the battery to be tested when discharging under the current can be obtained, and the calculation formula is as follows:
Q＝Q heater ×S Battery cell /S Heater
However, wherein S Heater 、Q Heater S and S Battery cell All three data can be measured according to the battery heating value test method, so that the heating value Q of the battery to be tested can be measured when the battery is discharged under the current according to the battery heating value test method.
According to the battery heating value testing method, the heating value of the same battery to be tested in different constant current discharge can be measured, and the excessive temperature integral area corresponding to the battery to be tested in different discharge currents can be calculated, so that corresponding heating value data of the battery to be tested in each discharge current can be obtained according to the heating value calculation formula, the heating value of the battery to be tested in any discharge current can be obtained through only one heating curve, the testing time and the testing cost of the heating value of the battery to be tested are greatly saved, and the testing efficiency is improved.
As shown in fig. 2, another preferred embodiment of the present utility model provides a battery heating amount test method including a discharging step S10', a cooling step S11', a heating step S12', a calculating step S13', and a charging step S08 'and a cooling step S09'. Here, since the discharging step S10', the cooling step S11', the heating step S12', and the calculating step S13' are the same as the discharging step S10, the cooling step S11, the heating step S12, and the calculating step S13 in the foregoing embodiments, respectively, for brevity, they will not be further described herein. Specifically, in the charging step S08', the battery to be tested is charged.
In order to ensure that the battery to be tested is always in a discharge state during the discharge process, in the battery heating value testing method provided by the other preferred embodiment of the present utility model, the battery to be tested may be charged before being subjected to the discharge process, so as to ensure sufficient electric quantity during the discharge process.
Further, the battery to be tested generates heat during the charging process to raise its own temperature, so in the preferred embodiment, after the battery to be tested is charged, the battery to be tested is cooled to reduce its temperature to the initial temperature, so as to ensure that the battery to be tested performs the subsequent process under the same environment as the discharging of the battery to be tested, so as to ensure the accuracy, precision and effectiveness of the test result, i.e. in the cooling step S09', after the battery to be tested is charged, the battery to be tested is cooled to adjust its temperature to the initial temperature.
The battery heating value testing method disclosed by the utility model has the advantages of low cost, less time, low process requirements, simplicity, reliability, practicability and the like.
As shown in fig. 3, a battery heating value testing apparatus provided in a further preferred embodiment of the present utility model includes a charge and discharge device 4 connected to a battery 1 to be tested and performing charge or discharge processing on the battery 1 to be tested; the heating device 3 is arranged on the surface of the battery 1 to be tested and is used for heating the battery 1 to be tested with preset heating power; the temperature measuring device 6 is connected to the battery 1 to be measured and is used for detecting and recording the initial temperature, the charging temperature, the discharging temperature or the heating temperature of the battery 1 to be measured in the charging, discharging or heating process in real time and the charging time, the discharging time or the heating time corresponding in real time; the core processor is connected to the temperature measuring device 6, and is used for calculating the heating value of the battery 1 to be measured during discharging according to the initial temperature, the discharging time, the discharging temperature, the heating time, the heating temperature and the preset heating power.
Here, before the discharge treatment of the battery 1 to be measured, the temperature of the battery 1 to be measured is first adjusted to the initial temperature. After the adjustment is finished, the battery 1 to be tested is discharged with a certain current value through the charging and discharging device 4, in this preferred embodiment, the battery 1 to be tested is discharged with a constant current value, and the discharging temperature in the discharging process and the discharging time corresponding to the discharging temperature are recorded in real time, of course, the time when the discharging of the battery 1 to be tested is finished may be the time when the electric quantity of the battery is exhausted, but in order to shorten the testing time and the cost and improve the testing efficiency, in the battery heating value testing device provided in this preferred embodiment, a certain predetermined time is used as the discharging time of the battery 1 to be tested, for example, the discharging time can be controlled to be 1 hour, 2 hours, 3 hours or 30 minutes, 50 minutes, and so on.
Further, in order to avoid radiation heat leakage of the battery 1 to be tested in the discharging process, in the battery heating value testing device provided by the further preferred embodiment of the present utility model, the wool felt 5 is used to wrap the battery 1 to be tested, and the wrapped battery 1 to be tested is placed in the constant temperature equipment 2, and meanwhile, the temperature in the constant temperature equipment 2 is controlled to be constant. Further, in the present preferred embodiment, it is controlled at the initial temperature. Specifically, the constant temperature equipment 2 adopts a high-low temperature box, the convection intensity in the high-low temperature box is strong, the constant temperature can be kept, the temperature difference between the outer surface temperature of the wool felt 5 and the temperature of the high-low temperature box is small, and the radiation heat leakage in the discharging process can be reduced, so that the accuracy of the battery heating value test in the discharging process is ensured. The initial temperature and the temperature in the constant temperature device 2 can be set to any values according to actual needs, so long as the temperature in the constant temperature device 2 is kept unchanged in the whole discharging or heating process.
After the battery 1 to be measured is discharged, the temperature of the battery 1 to be measured is restored to the initial temperature again, then the battery 1 to be measured is heated through the heating equipment 3 arranged on the surface of the battery 1 to be measured, and meanwhile, the heating temperature of the battery 1 to be measured and the heating time corresponding to the heating temperature in the heating process are detected and recorded in real time through the temperature measuring device 5. In this case, the heating power Q of the heating device 3 during heating is set Heater Any choice may be made as long as it satisfies the basic performance of the battery 1 to be measured.
It should be noted that, of course, after the initial temperature of the battery 1 to be measured is adjusted, the battery 1 to be measured may be heated first, and after the heating is completed, the temperature is restored to the initial temperature and then the discharging treatment is performed.
In particular, during discharge according to the core processor recordThe change of the discharge temperature of the battery to be measured with time can draw a temperature rise curve m of the battery to be measured 1 in the discharge process, and likewise, the temperature rise curve n of the battery to be measured 1 in the heating process can be drawn according to the change of the heating temperature of the battery to be measured with time in the heating process. According to the temperature rise curve m, a first temperature integral area S of the excess temperature of the battery 1 to be measured in the discharging process can be calculated Battery cell And the second temperature integral area S of the excessive temperature of the battery 1 to be measured in the heating process can be calculated according to the temperature rise curve n Heater Furthermore, the first temperature integration area S of the excess temperature of the battery 1 to be measured in the discharging process can be used Battery cell Second temperature integral area S of excess temperature of battery 1 to be measured during heating Heater Heating power Q of heating device 3 Heater The generated heat value Q of the battery 1 to be measured when discharging at a certain current is calculated.
Wherein the first temperature integration area S Battery cell And a second temperature integration area S Heater The calculation is performed according to the following formula:
τ＝τ 1 -τ 0 ，θ＝T 1 -T 0 ；
τ’＝τ 2 -τ 0’ ，θ′＝T 2 -T 0 ；
wherein T is 0 For an initial temperature τ 1 For the discharge end time of the battery to be tested, τ 0 For the discharge starting time of the battery to be tested, T 1 For the temperature at the end of the discharge of the battery to be measured, τ 2 For the heating end time of the battery to be measured, τ 0’ T is the heating starting time of the battery to be tested 2 And the temperature at the heating end time of the battery to be measured.
Further, the heating value Q is calculated according to the following formula:
wherein Q is Heater Is preset heating power, and S Battery cell And S is equal to Heater In the calculation of (c), τ=τ'.
Specifically, in taking a battery to be tested as a research object, the following thermal equilibrium equation can be established by applying the first law of thermodynamics:
qdτ＝Cdθ+hθdτ
θ＝t-t 0
wherein q is heating power, W; τ is time, s; c is heat capacity, J/K; θ is excess temperature, K; t is t 0 The initial temperature, K; t is the temperature of the battery to be measured at the discharge end time; h is the total heat transfer coefficient. By arranging the above equations, it is possible to obtain:
where a is the end time. That is, when the heating time is uniform and the heat exchange coefficient and the battery heat capacity are unchanged, the integral area S of the excess temperature is proportional to the heating value q. Therefore, when the battery to be tested is heated by the heating device 3, the following relational expression is satisfied:
S 1 /q 1 ＝S 2 /q 2 ＝...＝S n /q n
that is, the integrated area S of the excessive temperature of the battery 1 to be measured during heating is known in the same period of time Heater Heating power Q Heater And an integrated area S of excess temperature of the battery 1 to be measured when discharging at constant current Battery cell The average heating value Q of the battery 1 to be measured when discharging at the constant current can be obtained, and the calculation formula is as follows:
Q＝Q heater ×S Battery cell /S Heater 。
Further, as shown in fig. 3, in the battery heating value testing apparatus according to another preferred embodiment of the present utility model, at least one lead-out hole 21 is provided on the constant temperature device 2, and the data transmission lines 22 of the heating device 3 and the temperature measuring device 5 are respectively extended from the lead-out hole 21 to be connected to an external heating system and a temperature measuring system, so as to perform monitoring and control of the heating process and the temperature measuring process. Further, battery tabs 12 are provided on both sides of the battery 1 to be measured. Specifically, the battery 1 to be tested further includes a charge/discharge wire 11, where the charge/discharge wire 11 is connected to the battery tab 12 and extends from the lead-out hole 21 to be connected to the charge/discharge device 4, so that the charge/discharge device 4 can charge/discharge the battery 1 to be tested.
In order to ensure that the battery 1 to be tested can be discharged and heated at a constant temperature, the battery heating value testing device according to another preferred embodiment of the present utility model preferably employs the high-low temperature box as the constant temperature device 2 because the convection intensity in the high-low temperature box, i.e., the high-low temperature test box, is strong and the constant temperature can be maintained. Furthermore, in order to avoid the influence of the radiant heat leakage of the battery 1 to be tested on the test result during the discharging and heating processes, in the preferred embodiment, the battery 1 to be tested is further wrapped by a wool felt, that is, as shown in fig. 3, the device for testing the heat productivity of the battery further comprises a wool felt 5, the wool felt 5 is wrapped on the surface of the battery 1 to be tested, and the temperature difference between the temperature of the outer surface of the wool felt 5 and the temperature in the high-low temperature box is very small, so that the radiant heat leakage of the battery 1 to be tested during the discharging and heating processes is avoided, and the accuracy of the test result of the device for testing the heat productivity of the battery is improved. Preferably, in the battery heating value testing apparatus provided in still another preferred embodiment of the present utility model, the heating device 3 is a thin film type electric heater.
Further, as shown in fig. 3, the thermostat 2 includes a thermostat monitoring system and a thermostat control system for monitoring and controlling the temperature within the thermostat 2. Here, the constant temperature equipment monitoring system monitors the temperature and the like in the constant temperature equipment 2 in real time, and transmits the monitored temperature and the like to the constant temperature equipment control system, and the constant temperature equipment control system can adjust the temperature and the like in the constant temperature equipment 2 in real time according to the monitored temperature and the like, so that the constant temperature equipment 2 can provide constant environmental temperature for the test of the heating value of the battery 1 to be tested.
The battery heating value testing method and the battery heating value testing device disclosed by the utility model have the advantages of simple, reliable and practical structure, low testing cost, less time and low process requirements.
In summary, the above embodiments are provided to illustrate the principles of the present utility model and its efficacy, but not to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (14)
1. The battery heating value testing method is characterized by comprising the following steps of:
a discharging step, after the temperature of the battery to be measured is adjusted to an initial temperature, discharging the battery to be measured, and detecting and recording the discharging temperature and the corresponding discharging time of the battery to be measured in the discharging process in real time;
a cooling step of cooling the temperature of the battery to be measured from the discharge temperature to the initial temperature;
heating the battery to be detected with preset heating power, and detecting and recording the heating temperature and the corresponding heating time of the battery to be detected in the heating process in real time;
calculating, namely calculating the heating value of the battery to be tested in discharging according to the initial temperature, the discharging time, the discharging temperature, the heating time, the heating temperature and the preset heating power;
the calculating step specifically comprises the following steps:
calculating an integral area, namely calculating a first temperature integral area of the excess temperature of the battery to be measured in the discharging process according to the initial temperature, the discharging time and the discharging temperature, and calculating a second temperature integral area of the excess temperature of the battery to be measured in the heating process according to the initial temperature, the heating time and the heating temperature;
and calculating the heating value, namely calculating the heating value of the battery to be tested when the battery to be tested discharges according to the first temperature integration area, the second temperature integration area and the preset heating power.
2. The battery heating value test method according to claim 1, wherein in the integrated area calculation, the first temperature integrated area S Battery cell And the second temperature integration area S Heater The calculation is performed according to the following formula:
wherein T is 0 For the initial temperature τ 1 For the discharge end time of the battery to be tested, tau 0 For the discharge starting time of the battery to be tested, T 1 τ is the temperature at the discharge end time of the battery to be tested 2 For the heating end time of the battery to be tested, tau 0’ T is the heating starting time of the battery to be tested 2 And heating the battery to be measured to a temperature at the end time.
3. The battery heat generation amount test method according to claim 2, wherein in the heat generation amount calculation, the heat generation amount Q is calculated according to the following formula:
wherein Q is Heater The preset heating power is the S Battery cell And S is as follows Heater In the calculation of (c), τ=τ'.
4. The battery heating value test method according to claim 1, characterized by further comprising, before the discharging step:
and a charging step, wherein the battery to be tested is charged.
5. The battery heating value test method according to claim 4, characterized by further comprising, after the charging step:
and cooling, namely cooling the battery to be detected after the battery to be detected is charged, so as to adjust the temperature of the battery to be detected to the initial temperature.
6. The battery heating value test method according to any one of claims 1 to 5, characterized in that in the discharging step, the battery to be tested is discharged at a constant current value.
7. A battery heating value testing device, characterized by comprising:
the charging and discharging equipment is connected with the battery to be tested and charges or discharges the battery to be tested;
the heating equipment is arranged on the surface of the battery to be tested and is used for heating the battery to be tested with preset heating power;
the temperature measuring equipment is connected with the battery to be measured and used for detecting and recording the charging temperature, the discharging temperature or the heating temperature of the battery to be measured in the charging, discharging or heating process in real time and the charging time, the discharging time or the heating time corresponding to the charging, discharging or heating time in real time;
the core processor is connected with the temperature measuring equipment and used for calculating the heating value of the battery to be measured during discharging according to the initial temperature, the discharging time, the discharging temperature, the heating time, the heating temperature and the preset heating power;
the core processor further includes:
an integrated area calculating unit, configured to calculate a first temperature integrated area of the excess temperature of the battery to be measured in the discharging process according to the initial temperature, the discharging time and the discharging temperature, and calculate a second temperature integrated area of the excess temperature of the battery to be measured in the heating process according to the initial temperature, the heating time and the heating temperature;
and the heating value calculation unit is used for calculating the heating value of the battery to be tested during discharging according to the first temperature integration area, the second temperature integration area and the preset heating power.
8. The battery heating value testing device according to claim 7, wherein in the integrated area calculating unit, the first temperature integrated area S Battery cell And the second temperature integration area S Heater The calculation is performed according to the following formula:
wherein T is 0 For the initial temperature τ 1 For the discharge end time of the battery to be tested, tau 0 For the discharge starting time of the battery to be tested, T 1 τ is the temperature at the discharge end time of the battery to be tested 2 For the heating end time of the battery to be tested, tau 0’ T is the heating starting time of the battery to be tested 2 And heating the battery to be measured to a temperature at the end time.
9. The battery heat generation amount test device according to claim 8, wherein in the heat generation amount calculation unit, the heat generation amount Q is calculated according to the following formula:
wherein Q is Heater The preset heating power is the S Battery cell And S is as follows HeatingDevice for preventing and treating cancer In the calculation of (c), τ=τ'.
10. The battery heating value testing apparatus according to claim 7, further comprising a thermostat device for placing the battery to be tested therein to adjust the battery to be tested to be always in an ambient environment where the temperature is constant.
11. The battery heating value testing device according to claim 10, wherein the thermostat is provided with at least one lead-out hole.
12. The battery heating value testing device according to claim 11, wherein battery tabs are provided on both sides of the battery to be tested.
13. The battery heating value testing device according to claim 12, wherein the battery to be tested includes a charge-discharge wire connected to the battery tab and extending from the lead-out hole to be connected to the charge-discharge equipment.
14. The battery heating value testing device of claim 7, further comprising a wool felt for wrapping the battery under test.
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| CN108983107B (en) * | 2018-08-02 | 2020-09-04 | 上海理工大学 | Heat generation rate testing method for power battery |
| CN109830710B (en) * | 2019-01-29 | 2020-11-17 | 广东国鸿氢能科技有限公司 | Method for testing heat capacity of fuel cell stack |
| CN110146819B (en) * | 2019-05-22 | 2021-04-13 | 广州小鹏汽车科技有限公司 | Method and system for estimating actual temperature rise time of battery, automobile, device and storage medium |
| CN111198325B (en) * | 2019-12-31 | 2022-11-22 | 湖州师范学院 | Lithium battery performance detection method and system and computer readable storage medium |
| CN111398827B (en) * | 2020-03-18 | 2021-03-19 | 珠海迈巨微电子有限责任公司 | Ambient temperature prediction method, battery temperature prediction method and electric quantity calculation method |
| CN115574977A (en) * | 2022-08-31 | 2023-01-06 | 武汉海微科技有限公司 | Display screen temperature rise test method, device, equipment and storage medium |
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