CN113447522A - Method and device for testing equivalent heat capacity in battery - Google Patents
Method and device for testing equivalent heat capacity in battery Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 64
- 239000007788 liquid Substances 0.000 claims abstract description 206
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- 238000009529 body temperature measurement Methods 0.000 claims description 5
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The embodiment of the invention provides a method and a device for testing equivalent heat capacity in a battery, wherein the method comprises the steps of sealing a first heat-conducting liquid with a first liquid parameter in a first closed container, and recording the first temperature of the first heat-conducting liquid in a first time period at equal intervals; simultaneously sealing the battery to be tested and a second heat-conducting liquid with a second liquid parameter in a second closed container, and recording a second temperature of the second heat-conducting liquid in a second time period at equal intervals; and calculating the internal equivalent heat capacity of the battery to be measured according to the first liquid parameter, the second liquid parameter, the first temperature and the second temperature. The technical scheme provided by the embodiment of the invention can calculate the equivalent heat capacity in the battery by respectively recording the two temperature changes of the heat-conducting liquid under the two conditions of no battery and battery, has simple test steps, easily-obtained test equipment and easily-designed test device, is suitable for large-scale batch test, can be suitable for various scenes and has low overall test cost.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of battery detection, in particular to a method and a device for testing equivalent heat capacity in a battery.
[ background of the invention ]
The lithium ion battery has the advantages of high specific energy, light weight and the like, and is widely applied to the fields of electric automobiles, tablet computers, notebook computers and the like. If the battery is not used properly, thermal runaway of the battery will be caused, which may cause serious safety problems. Therefore, real-time monitoring of the internal temperature of the battery is very important to ensure the safety of the battery as well as the user. The acquisition of the equivalent heat capacity inside the battery is a precondition for realizing the internal temperature of the battery, and at present, no good method exists for simply and quickly testing the equivalent heat capacity inside the battery.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a method and an apparatus for testing equivalent heat capacity inside a battery, so as to solve the technical problem in the prior art that the testing step of the equivalent heat capacity inside the battery is complicated and troublesome.
In a first aspect, an embodiment of the present invention provides a method for testing equivalent heat capacity inside a battery, including the following steps:
sealing a first heat transfer liquid having a first liquid parameter in a first containment vessel and recording at equal intervals a first temperature of said first heat transfer liquid over a first period of time;
simultaneously sealing a battery to be tested and a second heat-conducting liquid with a second liquid parameter in a second closed container, and recording a second temperature of the second heat-conducting liquid at equal intervals in a second time period;
and calculating the internal equivalent heat capacity of the battery to be measured according to the first liquid parameter, the second liquid parameter, the first temperature and the second temperature.
According to the scheme provided by the embodiment, the internal equivalent heat capacity of the battery to be tested can be calculated by means of the known parameters of the heat conduction liquid and by means of recording two temperature changes of the heat conduction liquid in two time periods without the battery and with the battery respectively, and the internal equivalent heat capacity of different batteries can be tested on a large scale and in multiple scenes.
In a preferred embodiment, in the step of sealing a first heat-transfer liquid having a first liquid parameter in a first containment vessel and recording at regular intervals a first temperature of said first heat-transfer liquid over a first period of time, the steps of:
a temperature measuring component is arranged in the first closed container;
heating a first heat transfer liquid having a first liquid parameter to a liquid temperature;
pouring the first heat-transfer liquid into the first closed container;
sealing the first closed container;
a first temperature of the first thermally conductive liquid is recorded at equal intervals over a first period of time.
According to the scheme provided by the embodiment, the temperature measuring assembly arranged in the first closed container is used for measuring the first temperature of the first heat-conducting liquid in the sealed state, the change curve of the first temperature is recorded in an equidistant recording mode, and accurate battery-free state data are provided for calculation of equivalent heat capacity in the battery.
In a preferred embodiment, in the step of simultaneously sealing the battery under test and a second heat-conducting liquid having a second liquid parameter in a second closed container, and recording at equal intervals a second temperature of the second heat-conducting liquid for a second period of time, the method comprises the steps of:
a temperature measuring component is arranged in the second closed container;
adjusting the temperature of the battery to be measured to the battery temperature;
standing the battery to be tested for a first standing time;
placing the battery to be tested into the second closed container;
heating a second heat transfer liquid having a second liquid parameter to the liquid temperature;
pouring the second heat-transfer liquid into the second closed container;
sealing the second closed container;
a second temperature of the second thermally conductive liquid is recorded at equal intervals over a second period of time.
According to the scheme provided by the embodiment, the temperature measuring assembly arranged in the second closed container is used for measuring the second temperature of the second heat-conducting liquid in the sealed state, and the change curve of the second temperature is recorded in an equidistant recording mode, so that accurate battery state data are provided for calculating the equivalent heat capacity in the battery.
In a preferred embodiment, the maximum value of the liquid temperature does not exceed 50 ℃, and the cell temperature is lower than the liquid temperature.
Through the scheme that this embodiment provided, the battery safety of awaiting measuring the battery when guaranteeing that the battery that awaits measuring soaks in second heat-conduction liquid prevents that the battery that awaits measuring from taking place adverse reaction and even explosion's danger.
In a preferred embodiment, the first closed container and the second closed container are the same closed container;
between the step of recording the first temperature at equal intervals and the step of recording the second temperature at equal intervals, the method further comprises the step of emptying the closed container, and specifically comprises the following steps:
emptying the first heat transfer liquid in the closed container;
the empty containment vessel is allowed to sit for a first resting time.
Through the scheme that this embodiment provided, adopt same airtight container and empty airtight container and shelve a period between the record first temperature and the record second temperature, the equipment environment that can guarantee to record first temperature and record second temperature is the same, and then guarantees the accuracy of the inside equivalent heat capacity of battery that the test obtained.
In a preferred embodiment, the first period of time is greater than or equal to 4 hours and the second period of time is greater than or equal to 4 hours, the interval during which the first temperature is recorded at equal intervals during the first period of time being the same as the interval during which the second temperature is recorded at equal intervals during the second period of time.
By the scheme provided by the embodiment, the first time period for recording the first temperature and the second time period for recording the second temperature are set to be longer, and the time interval between the temperature points of the first temperature and the time interval between the second temperature points of the second temperature recorded in the two time periods are set to be the same, so that the accuracy of the tested equivalent heat capacity in the battery can be ensured.
In a preferred embodiment, the first and second time periods are the same and are each 4 hours.
Through the scheme provided by the embodiment, the conditions of recording the first temperature and the second temperature are the same, and the accuracy of the equivalent heat capacity in the battery obtained through testing is further ensured.
In a preferred embodiment, the first liquid parameter of the first heat-conducting liquid is the same as the second liquid parameter of the second heat-conducting liquid.
Through the scheme provided by the embodiment, the conditions of recording the first temperature and the second temperature are the same, and the accuracy of the equivalent heat capacity in the battery obtained through testing is further ensured.
In a second aspect, an embodiment of the present invention provides a device for testing equivalent heat capacity inside a battery, including: the device comprises a closed container, a battery to be tested, heat-conducting liquid and a temperature measuring component;
the closed container is used for containing the heat conduction liquid and the battery to be tested;
the temperature measuring component is used for measuring the temperature of the heat-conducting liquid according to the method for testing the equivalent heat capacity in the battery disclosed by the first aspect.
According to the scheme provided by the embodiment, the simple and easily-obtained closed container and the temperature measuring assembly are adopted, the known parameters of the heat conduction liquid are used, the internal equivalent heat capacity of the battery to be measured can be calculated by respectively recording two temperature changes of the heat conduction liquid in two time periods without the battery and with the battery, and the internal equivalent heat capacity of different batteries can be tested in a large-scale and multi-scene mode.
In a preferred embodiment, the closed container has a container body and a cover body, the cover body is movably connected to the top of the container body, and the volume of the container body is larger than that of the battery to be tested.
Through the scheme that this embodiment provided, can be convenient for use same airtight container for the battery-free condition with have the battery condition to create the same, unchangeable container environment and successively record first temperature and second temperature to the accuracy of the inside equivalent heat capacity of battery that the assurance was obtained tests.
In a preferred embodiment, the outer surface of the container body is adhered with an insulating layer.
Through the scheme that this embodiment provided for the container body can possess the heat preservation effect, when guaranteeing that temperature measurement component is taking notes first temperature and second temperature, can not receive the influence of ambient temperature change, further guarantees the accuracy of the inside equivalent heat capacity of battery that the test obtained.
In a preferred embodiment, no chemical reaction occurs between the thermally conductive liquid and the cell under test.
Through the scheme provided by the embodiment, the problem that any chemical reaction occurs between the heat-conducting liquid and the battery to be tested in the testing process to cause inaccuracy of the recorded first temperature and second temperature can be avoided, and the accuracy of the equivalent heat capacity in the battery obtained through testing is further ensured.
In a preferred embodiment, the thermometric assembly measures with an accuracy greater than 0.1 ℃.
Through the scheme that this embodiment provided for the accuracy of the first temperature that the temperature measurement subassembly recorded and second temperature is high, further guarantees the accuracy of the inside equivalent heat capacity of battery that the test obtained.
Compared with the prior art, the technical scheme at least has the following beneficial effects:
according to the method and the device for testing the equivalent heat capacity in the battery disclosed by the embodiment of the invention, the equivalent heat capacity in the battery can be calculated by respectively recording two temperature changes of the heat-conducting liquid under two conditions of no battery and battery, the testing steps are simple, the testing equipment is easy to obtain, the testing device is easy to design, the method and the device are suitable for large-scale batch testing, can be suitable for various scenes, and are low in overall testing cost.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating steps of a first method for testing equivalent heat capacity inside a battery according to embodiment 1 of the present invention;
fig. 2 is a flowchart of a specific Step100 in the first method for testing equivalent heat capacity in a battery according to embodiment 1 of the present invention;
fig. 3 is a flowchart of specific steps of Step200 in the first method for testing equivalent heat capacity in a battery according to embodiment 1 of the present invention;
fig. 4 is a flowchart illustrating the general steps of a first method for testing equivalent heat capacity inside a battery according to embodiment 1 of the present invention;
fig. 5 is a flowchart illustrating steps of a second method for testing equivalent heat capacity inside a battery according to embodiment 2 of the present invention;
fig. 6 is a flowchart of specific steps of Step 200' in the second method for testing equivalent heat capacity in a battery according to embodiment 2 of the present invention;
fig. 7 is a flowchart illustrating the general steps of a second method for testing equivalent heat capacity inside a battery according to embodiment 2 of the present invention;
fig. 8 is a schematic diagram of a testing apparatus for testing equivalent heat capacity inside a battery provided in embodiment 3 of the present invention, in a no-battery condition;
fig. 9 is a schematic diagram of a test apparatus for testing equivalent heat capacity inside a battery provided in embodiment 3 of the present invention, in a condition with the battery;
fig. 10 is a schematic structural view of a closed container in the apparatus for testing equivalent heat capacity in a battery provided in embodiment 3 of the present invention.
Reference numerals:
1-sealing the container; 2-a battery to be tested; 3-a heat-conducting liquid; 4-temperature measuring component; 5-a container body; 6-cover body; 7-insulating layer.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment 1 of the invention discloses a method for testing the equivalent heat capacity in a battery, which is used for calculating the equivalent heat capacity in the battery to be tested by a testing method for recording the temperature change of heat-conducting liquid sealed in a closed container under the conditions of no battery and the battery, and has the advantages of simple steps, easily obtained equipment and lower cost. In the following description of the method for testing equivalent heat capacity in the battery of this embodiment 1, the specific steps and flows of the testing method are described by taking the number of the closed containers as two as an example, so as to more intuitively and simply describe the core and essence of the testing method disclosed in the present invention. It should be noted that, the number of the closed containers used in the test method of this embodiment 1 is not limited, and the test method under the condition of using other numbers of closed containers can be obtained by analogy according to the test method of this embodiment 1, and details are not described herein again.
As shown in fig. 1, the method for testing the equivalent heat capacity inside the battery of embodiment 1 specifically includes the following steps:
step 100: a first heat transfer liquid having a first liquid parameter is sealed within a first containment vessel and a first temperature of the first heat transfer liquid is recorded at equal intervals over a first period of time.
Step 200: and simultaneously sealing the battery to be tested and the second heat-conducting liquid with the second liquid parameter in a second closed container, and recording the second temperature of the second heat-conducting liquid in a second time period at equal intervals.
Step 300: and calculating the internal equivalent heat capacity of the battery to be measured according to the first liquid parameter, the second liquid parameter, the first temperature and the second temperature.
In the test method of embodiment 1, two sealed containers are used to set the two conditions of the no-battery condition and the battery condition respectively to perform the temperature change test on the heat transfer liquid, so Step100 and Step200 can be performed simultaneously to increase the efficiency of the test of the equivalent heat capacity in the battery. However, Step300 should be executed after Step100 and Step200 are executed and the first temperature and the second temperature are obtained.
In the method for testing the equivalent heat capacity inside the battery of embodiment 1, with the help of the known parameters of the heat-conducting liquid, the internal equivalent heat capacity of the battery to be tested can be calculated by respectively recording two temperature changes of the heat-conducting liquid in two time periods without the battery and with the battery, and the internal equivalent heat capacity of different batteries can be tested in a large-scale and multi-scene manner.
As shown in fig. 2, in the method for testing the equivalent heat capacity in the battery of embodiment 1, in Step100, "sealing the first heat-conducting liquid having the first liquid parameter in the first closed container, and recording the first temperature of the first heat-conducting liquid at equal intervals during the first time period", the method specifically includes the following steps:
step 101: a temperature measuring component is arranged in the first closed container.
Step 102: a first heat transfer liquid having first liquid parameters is heated to a liquid temperature.
Step 103: pouring the first heat-conducting liquid into the first closed container.
Step 104: and sealing the first closed container.
Step 105: the first temperature of the first thermally conductive liquid is recorded at equal intervals over a first period of time.
Since the first heat transfer liquid does not need to be mixed with the first closed container during heating, Step101 and Step102 can be executed simultaneously, Step101 and Step103 do not have a fixed sequence, and Step101 or Step103 can be executed first. However, Step104 should be executed after all of steps 101 to 103 are executed. Step103 should be executed after Step102 is completed, and Step105 should be executed after Step104 is completed.
In the method for testing the equivalent heat capacity inside the battery of embodiment 1, the temperature measuring component built in the first closed container is used to measure the first temperature of the first heat-conducting liquid in the sealed state, and the change curve of the first temperature is recorded in an equidistant recording manner, so as to provide accurate data of the battery-free state for calculating the equivalent heat capacity inside the battery.
As shown in fig. 3, in the method for testing the equivalent heat capacity in the battery of embodiment 1, in Step200, "simultaneously seal the battery to be tested and the second heat-conducting liquid with the second liquid parameter in the second closed container, and record the second temperature of the second heat-conducting liquid at equal intervals in the second time period", the method specifically includes the following steps:
step 201: and a temperature measuring component is arranged in the second closed container.
Step 202: and adjusting the temperature of the battery to be measured to the battery temperature.
Step 203: and standing the battery to be tested for a first standing time.
Step 204: and putting the battery to be tested into the second closed container.
Step 205: a second heat transfer liquid having a second liquid parameter is heated to a liquid temperature.
Step 206: pouring a second heat transfer liquid into the second closed container.
Step 207: and sealing the second closed container.
Step 208: the second temperature of the second thermally conductive liquid is recorded at equal intervals over a second period of time.
Since the heating of the battery to be tested and the second heat transfer liquid does not need the cooperation of the second sealed container, Step201, Step202 and Step205 can be executed simultaneously, and Step201, Step204 and Step206 do not have a fixed sequence, Step201 may be executed first, Step204 may be executed first, and Step206 may be executed first. However, Step207 should be executed after all of steps 201 to 206 are executed. Step203 should be executed after Step202 is completed, Step204 should be executed after Step203 is completed, Step206 should be executed after Step205 is completed, and Step208 should be executed after Step207 is completed.
In the method for testing the equivalent heat capacity inside the battery of embodiment 1, the temperature measuring component built in the second closed container is used to measure the second temperature of the second heat-conducting liquid in the sealed state, and the change curve of the second temperature is recorded in an equidistant recording manner, so as to provide accurate data of the state of the battery for calculating the equivalent heat capacity inside the battery.
In the method for testing the equivalent heat capacity inside the battery of this example 1, the maximum value of the liquid temperature was not more than 50 ℃, and the battery temperature was lower than the liquid temperature.
The method for testing the equivalent heat capacity inside the battery in embodiment 1 ensures the safety of the battery to be tested when the battery to be tested is immersed in the second heat-conducting liquid, and prevents the battery to be tested from generating adverse reactions and even explosion.
In the method for testing the equivalent heat capacity inside the battery of this embodiment 1, the first period of time is greater than or equal to 4 hours, the second period of time is greater than or equal to 4 hours, and the time interval during which the first temperature is recorded at equal intervals in the first period of time is the same as the time interval during which the second temperature is recorded at equal intervals in the second period of time.
In the method for testing equivalent heat capacity inside a battery according to embodiment 1, the first time period for recording the first temperature and the second time period for recording the second temperature are set to be longer, and the time interval between the temperature points of the first temperature and the time interval between the second temperature points of the second temperature recorded in the two time periods are set to be the same, so that the accuracy of the equivalent heat capacity inside the battery obtained through the test can be ensured.
In the method for testing the equivalent heat capacity inside the battery of the embodiment 1, the first time period and the second time period are the same and are all 4 hours.
The method for testing the equivalent heat capacity inside the battery in embodiment 1 can further ensure that the conditions for recording the first temperature and the second temperature are the same, and further ensure the accuracy of the equivalent heat capacity inside the battery obtained through the test.
In the method for testing the equivalent heat capacity inside the battery of the embodiment 1, the first liquid parameter of the first heat-conducting liquid is the same as the second liquid parameter of the second heat-conducting liquid.
The method for testing the equivalent heat capacity inside the battery in embodiment 1 can ensure that the conditions for recording the first temperature and the second temperature are the same, and further ensure the accuracy of the equivalent heat capacity inside the battery obtained through the test.
As shown in fig. 4, the specific general step flow of the method for testing the equivalent heat capacity inside the battery of this embodiment 1 is as follows:
step 101: a temperature measuring component is arranged in the first closed container.
Step 102: a first heat transfer liquid having first liquid parameters is heated to a liquid temperature.
Step 103: pouring the first heat-conducting liquid into the first closed container.
Step 104: and sealing the first closed container.
Step 105: the first temperature of the first thermally conductive liquid is recorded at equal intervals over a first period of time.
Step 201: and a temperature measuring component is arranged in the second closed container.
Step 202: and adjusting the temperature of the battery to be measured to the battery temperature.
Step 203: and standing the battery to be tested for a first standing time.
Step 204: and putting the battery to be tested into the second closed container.
Step 205: a second heat transfer liquid having a second liquid parameter is heated to a liquid temperature.
Step 206: pouring a second heat transfer liquid into the second closed container.
Step 207: and sealing the second closed container.
Step 208: the second temperature of the second thermally conductive liquid is recorded at equal intervals over a second period of time.
Step 300: and calculating the internal equivalent heat capacity of the battery to be measured according to the first liquid parameter, the second liquid parameter, the first temperature and the second temperature.
Step101, Step102, Step201, Step202 and Step205 may be executed at the same time, and Step101, Step103, Step201, Step206 and Step204 do not have a fixed order, and Step101 may be executed first, Step103 may be executed first, Step201 may be executed first, Step206 may be executed first, or Step204 may be executed first. However, Step104 should be executed after steps 101 to 103 are all executed, and Step207 should be executed after steps 201 to 204 are all executed. Step103 should be executed after Step102 is completed, Step105 should be executed after Step104 is completed, Step203 should be executed after Step202 is completed, Step206 should be executed after Step205 is completed, and Step208 should be executed after Step207 is completed. The final Step300 should be executed after all of the steps from Step101 to Step208 are executed.
Specifically, a first liquid parameter of the first heat transfer liquid and a second liquid parameter of the second heat transfer liquid are the same and both comprise a liquid mass MlAnd liquid heat capacity Cl. Heating the first and second heat-transfer liquids to a liquid temperature T before pouring into the closed containerlTemperature T of the liquidlThe maximum value of the temperature difference does not exceed 50 ℃, and the temperature of the battery to be measured is adjusted to be lower than the liquid temperature TlBattery temperature TbAnd standing the adjusted battery to be tested for a first standing time of at least 4 hours, wherein the first standing time is preferably 4 hours. When the temperature measuring component is a plurality of split temperature sensors, the temperature sensors are attached to any position in the first closed container and the second closed containerAnd/or pouring the first heat-conducting liquid into the first closed container to form a test environment without a battery condition, pouring the battery to be tested and the second heat-conducting liquid into the second closed container to form a test environment with a battery condition, covering the first closed container and the second closed container with covers and sealing the first closed container and the second closed container, wherein the first closed container and the second closed container are identical in shape, size and material, are closed containers of the same type and specification and are identical in sealing performance. Recording a first temperature T of a first heat-conducting liquid without a battery at equal intervals in a first time period by using a temperature measuring assembly4hAnd recording a second temperature T 'of the second thermally conductive liquid at equal intervals over a second time period under cell conditions'4hThe first and second periods of time are each at least 4 hours and preferably 4 hours, and the first temperature T is recorded at regular intervals during the first period of time4hAnd recording the second temperature T 'at equal intervals in the second time period'4hAre the same. Finally, the battery internal equivalent heat capacity C is calculated by the following formulac：
Example 2
The embodiment 2 of the invention discloses a method for testing the equivalent heat capacity in a battery, which is used for calculating the equivalent heat capacity in the battery to be tested by a testing method for recording the temperature change of heat-conducting liquid sealed in a closed container under the conditions of no battery and the battery, and has the advantages of simple steps, easily obtained equipment and lower cost. Compared with the method for testing the equivalent heat capacity in the battery disclosed in embodiment 1, in the method for testing the equivalent heat capacity in the battery disclosed in embodiment 2, the test environment without the battery condition and the test environment with the battery condition are sequentially arranged in the same sealed container, that is, the first sealed container and the second sealed container are the same sealed container, so that the equipment is relatively simpler to use, and the test environments can be better unified.
As shown in fig. 5, the method for testing equivalent heat capacity inside a battery in embodiment 2 further includes a step of emptying the sealed container between the step of recording the first temperature at equal intervals and the step of recording the second temperature at equal intervals, specifically:
step 100': a first heat transfer liquid having a first liquid parameter is sealed within the containment vessel and a first temperature of the first heat transfer liquid is recorded at equal intervals over a first period of time.
Step 200': the closed vessel was emptied.
Step 300': and simultaneously sealing the battery to be tested and the second heat-conducting liquid with the second liquid parameter in the closed container, and recording the second temperature of the second heat-conducting liquid in a second time period at equal intervals.
Step 400': and calculating the internal equivalent heat capacity of the battery to be measured according to the first liquid parameter, the second liquid parameter, the first temperature and the second temperature.
In this case, since the same sealed container is used throughout the test method of embodiment 2, Step100 ', Step 200', Step300 ', and Step 400' must be performed sequentially. However, the specific Step flow of Step100 ' and the execution sequence of each Step in example 2 are the same as those of Step100 in example 1, the specific Step flow of Step300 ' and the execution sequence of each Step in example 2 are the same as those of Step200 in example 1, and the specific Step flow of Step400 ' in example 2 is the same as that of Step300 in example 1. Therefore, specific steps, processes and advantages of Step100 ', Step300 ' and Step400 ' in embodiment 2 are not described herein again, and it is sufficient to refer to the description in embodiment 1 and fig. 1 to 4.
As shown in fig. 6, in the method for testing equivalent heat capacity in a battery according to embodiment 2, Step 200' includes the following steps:
step 201': the first heat transfer liquid in the closed container is emptied.
Step 202': the emptied closed container is allowed to sit for a first resting time.
Wherein, Step201 'and Step 202' must be executed in sequence. The first shelf time is preferably 2 hours.
In the method for testing equivalent heat capacity in the battery of this embodiment 2, the same sealed container is used, and the sealed container is emptied and left for a period of time between the recording of the first temperature and the recording of the second temperature, so that the environments of the devices recording the first temperature and the recording of the second temperature are the same, and the accuracy of the equivalent heat capacity in the battery obtained through the test is further ensured.
As shown in fig. 7, the specific general step flow of the method for testing the equivalent heat capacity inside the battery of this embodiment 2 is as follows:
step 101': a temperature measuring component is arranged in the closed container.
Step 102': a first heat transfer liquid having first liquid parameters is heated to a liquid temperature.
Step 103': the first heat transfer liquid is poured into the closed container.
Step 104': and sealing the closed container.
Step 105': the first temperature of the first thermally conductive liquid is recorded at equal intervals over a first period of time.
Step 201': the first heat transfer liquid in the closed container is emptied.
Step 202': the emptied closed container is allowed to sit for a first resting time.
Step 301': a temperature measuring component is arranged in the closed container.
Step 302': and adjusting the temperature of the battery to be measured to the battery temperature.
Step 303': and standing the battery to be tested for a first standing time.
Step 304': and putting the battery to be tested into the closed container.
Step 305': a second heat transfer liquid having a second liquid parameter is heated to a liquid temperature.
Step 306': pouring the second heat-conducting liquid into the closed container.
Step 307': and sealing the closed container.
Step 308': the second temperature of the second thermally conductive liquid is recorded at equal intervals over a second period of time.
Step 400': and calculating the internal equivalent heat capacity of the battery to be measured according to the first liquid parameter, the second liquid parameter, the first temperature and the second temperature.
Since the first heat transfer liquid is heated without the need of a closed container, Step101 'and Step 102' can be performed simultaneously, and Step101 'and Step 103' are not fixed in sequence, and Step101 'and Step 103' can be performed first, or Step101 'and Step 103' can be performed first. However, Step104 ' should be executed after all of steps 101 ' to 103 ' are executed. Step103 'should be executed after Step 102' is completed, and Step105 'should be executed after Step 104' is completed. Step202 'should be executed after Step 201' is executed. Since the heating of the battery to be tested and the second heat transfer liquid does not need the cooperation of a sealed container, Step301 ', Step302 ' and Step305 ' can be executed simultaneously, and Step301 ', Step304 ' and Step306 ' do not have a fixed sequence, Step301 ' can be executed first, Step304 ' can be executed first, and Step306 ' can be executed first. However, Step307 ' should be executed after all of steps 301 ' to 306 ' are executed. Step303 'should be executed after Step 302' is completed, Step304 'should be executed after Step 303' is completed, Step306 'should be executed after Step 305' is completed, and Step308 'should be executed after Step 307' is completed. Since the container used for recording the first temperature and the container used for recording the second temperature are the same sealed container, steps 101 ' to 105 ' should be performed after all steps have been performed, and steps 201 ' and 202 ' should be performed, while steps 301 ' to 308 ' and 400 ' should be performed after all steps 201 ' and 202 ' have been performed. The final Step400 ' should be executed after all the steps from Step101 ' to Step308 ' are executed.
Specifically, a first liquid parameter of the first heat transfer liquid and a second liquid parameter of the second heat transfer liquid are the same and both comprise a liquid mass MlAnd liquid heat capacity Cl. In the pouring into a closed containerThe first heat transfer liquid is previously heated to a certain liquid temperature TlTemperature T of the liquidlThe highest value of (A) does not exceed 50 ℃. When the temperature measuring assembly is a plurality of split temperature sensors, the temperature sensors are attached to any one and/or a plurality of positions in the closed container, the first heat-conducting liquid is poured into the closed container to form a testing environment without a battery condition, and the closed container is covered with a cover and sealed. Recording a first temperature T of a first heat-conducting liquid without a battery at equal intervals in a first time period by using a temperature measuring assembly4hThe first period of time is at least 4 hours and preferably is selected to be 4 hours. The first temperature T of the first heat-conducting liquid under the condition of no battery is obtained to be tested4hThereafter, the closed container was emptied and left for a first 2 hour shelf time so that the subsequent test environment in the battery-on condition was substantially the same as the previous test environment in the battery-off condition. Heating the second heat transfer liquid to a liquid temperature T before pouring into the closed containerlTemperature T of the liquidlThe maximum value of the temperature difference does not exceed 50 ℃, and the temperature of the battery to be measured is adjusted to be lower than the liquid temperature TlBattery temperature TbAnd standing the adjusted battery to be tested for a first standing time of at least 4 hours, wherein the first standing time is preferably 4 hours. When the temperature measuring assembly is a plurality of split type temperature sensors, the temperature sensors are attached to any one and/or a plurality of positions in the first closed container and the second closed container, the battery to be measured and the second heat-conducting liquid are poured into the closed container to form a test environment with battery conditions, and the closed container is covered with a cover and sealed. Recording a second temperature T 'of the second heat-conducting liquid with the temperature measuring assembly at equal intervals in a second time period under the condition of the battery'4hThe second period of time is at least 4 hours and preferably 4 hours, and the first temperature T is recorded at equal intervals during the first period of time4hAnd recording the second temperature T 'at equal intervals in the second time period'4hAre the same. Finally, the battery internal equivalent heat capacity C is calculated by the following formulac：
Example 3
As shown in fig. 8 and 9, embodiment 3 of the present invention provides a device for testing equivalent heat capacity inside a battery, including a sealed container 1, a battery 2 to be tested, a heat-conducting liquid 3, and a temperature measuring assembly 4. Wherein, the closed container 1 is used for containing the heat-conducting liquid 3 and the battery 2 to be tested; the temperature measuring component 4 is used for measuring the temperature of the heat-conducting liquid 3 according to the method for testing the equivalent heat capacity inside the battery disclosed by the first aspect, and the temperature measuring component 4 can be an integrated temperature measuring device or a plurality of split temperature sensors.
The device for testing the equivalent heat capacity in the battery of the embodiment 3 adopts the simple and easily obtained closed container 1 and the temperature measuring component 4, and by means of the known parameters of the heat-conducting liquid 3, the internal equivalent heat capacity of the battery 2 to be tested can be calculated by respectively recording two temperature changes of the heat-conducting liquid 3 in two time periods without the battery and with the battery, so that the internal equivalent heat capacity of different batteries can be tested in a large-scale and multi-scene manner.
As shown in fig. 10, in the apparatus for testing equivalent heat capacity in a battery according to example 3, a closed container 1 includes a container body 5 and a lid 6, the lid 6 is movably connected to the top of the container body 5, and the volume of the container body 5 is larger than the volume of the battery 2 to be tested. Wherein, the closed container 1 is preferably a foam box, so that the cost of the whole testing device is reduced.
The device for testing equivalent heat capacity in a battery of this embodiment 3 can facilitate the use of the same sealed container 1 to create the same and unchanged container environment for the battery-free condition and the battery-available condition, and record the first temperature and the second temperature in sequence, so as to ensure the accuracy of the equivalent heat capacity in the battery obtained by the test.
In the apparatus for testing equivalent heat capacity in a battery according to embodiment 3, an insulating layer 7 is attached to the outer surface of the container body 5. The heat-insulating layer 7 is made of heat-insulating materials such as heat-insulating cotton.
The inside equivalent heat capacity's of battery testing arrangement of this embodiment 3 for container body 5 can possess the heat preservation effect, when guaranteeing that temperature measurement component 4 is taking notes first temperature and second temperature, can not receive the influence of ambient temperature change, further guarantees the inside equivalent heat capacity's of battery accuracy that the test obtained.
In the apparatus for testing the equivalent heat capacity inside the battery of this embodiment 3, no chemical reaction occurs between the heat transfer liquid 3 and the battery 2 to be tested. The heat transfer liquid 3 may optionally include, but is not limited to, purified water, kerosene, coolant, and the like.
The device for testing the equivalent heat capacity in the battery of the embodiment 3 can avoid the problem that any chemical reaction occurs between the heat-conducting liquid 3 and the battery 2 to be tested in the testing process to cause the recorded first temperature and second temperature to be inaccurate, and further ensure the accuracy of the equivalent heat capacity in the battery obtained by testing.
In the apparatus for testing equivalent heat capacity inside a battery of this embodiment 3, the measurement accuracy of the temperature measuring component 4 is higher than 0.1 ℃. The temperature measuring component 4 may optionally include, but is not limited to, a temperature measuring instrument, etc., and the higher the measurement accuracy, the better.
The device for testing the equivalent heat capacity in the battery of this embodiment 3 enables the accuracy of the first temperature and the second temperature recorded by the temperature measurement component 4 to be high, and further ensures the accuracy of the equivalent heat capacity in the battery obtained through the test.
According to the method and the device for testing the equivalent heat capacity in the battery disclosed by the embodiment of the invention, the equivalent heat capacity in the battery can be calculated by respectively recording two temperature changes of the heat-conducting liquid under two conditions of no battery and battery, the testing steps are simple, the testing equipment is easy to obtain, the testing device is easy to design, the method and the device are suitable for large-scale batch testing, can be suitable for various scenes, and are low in overall testing cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. A method for testing equivalent heat capacity in a battery is characterized by comprising the following steps:
sealing a first heat transfer liquid having a first liquid parameter in a first containment vessel and recording at equal intervals a first temperature of said first heat transfer liquid over a first period of time;
simultaneously sealing a battery to be tested and a second heat-conducting liquid with a second liquid parameter in a second closed container, and recording a second temperature of the second heat-conducting liquid at equal intervals in a second time period;
and calculating the internal equivalent heat capacity of the battery to be measured according to the first liquid parameter, the second liquid parameter, the first temperature and the second temperature.
2. The method for testing equivalent heat capacity inside a battery according to claim 1, wherein in the step of sealing a first heat-conducting liquid having a first liquid parameter in a first hermetic container, recording a first temperature of the first heat-conducting liquid at equal intervals for a first period of time, the method comprises the steps of:
a temperature measuring component is arranged in the first closed container;
heating a first heat transfer liquid having a first liquid parameter to a liquid temperature;
pouring the first heat-transfer liquid into the first closed container;
sealing the first closed container;
a first temperature of the first thermally conductive liquid is recorded at equal intervals over a first period of time.
3. The method for testing equivalent heat capacity inside a battery according to claim 2, wherein in the step of simultaneously sealing the battery to be tested and a second heat-conducting liquid having a second liquid parameter in a second hermetic container, and recording a second temperature of the second heat-conducting liquid at equal intervals for a second period of time, the method comprises the steps of:
a temperature measuring component is arranged in the second closed container;
adjusting the temperature of the battery to be measured to the battery temperature;
standing the battery to be tested for a first standing time;
placing the battery to be tested into the second closed container;
heating a second heat transfer liquid having a second liquid parameter to the liquid temperature;
pouring the second heat-transfer liquid into the second closed container;
sealing the second closed container;
a second temperature of the second thermally conductive liquid is recorded at equal intervals over a second period of time.
4. The method for testing equivalent heat capacity inside a battery according to claim 3, wherein the maximum value of the liquid temperature is not more than 50 ℃, and the battery temperature is lower than the liquid temperature.
5. The method for measuring equivalent heat capacity inside a battery according to claim 1, wherein the first closed container and the second closed container are the same closed container;
between the step of recording the first temperature at equal intervals and the step of recording the second temperature at equal intervals, the method further comprises the step of emptying the closed container, and specifically comprises the following steps:
emptying the first heat transfer liquid in the closed container;
the empty containment vessel is allowed to sit for a first resting time.
6. The method of claim 1, wherein the first period of time is greater than or equal to 4 hours and the second period of time is greater than or equal to 4 hours, and wherein the first temperature is recorded at equal intervals during the first period of time which is the same as the second temperature is recorded at equal intervals during the second period of time.
7. The method for testing equivalent heat capacity inside a battery according to claim 6, wherein the first period of time is the same as the second period of time and is 4 hours each.
8. The method of claim 1, wherein the first liquid parameter of the first thermally conductive liquid is the same as the second liquid parameter of the second thermally conductive liquid.
9. A device for testing equivalent heat capacity in a battery is characterized by comprising: the device comprises a closed container, a battery to be tested, heat-conducting liquid and a temperature measuring component;
the closed container is used for containing the heat conduction liquid and the battery to be tested;
the temperature measuring component is used for measuring the temperature of the heat-conducting liquid according to the method for testing the equivalent heat capacity in the battery of any one of claims 1 to 8.
10. The apparatus of claim 9, wherein the container has a container body and a cover, the cover is movably connected to the top of the container body, and the volume of the container body is larger than that of the battery to be tested.
11. The apparatus for testing equivalent heat capacity in a battery according to claim 10, wherein an insulating layer is attached to an outer surface of the container body.
12. The apparatus for testing equivalent heat capacity inside battery of claim 9, wherein no chemical reaction occurs between the heat transfer liquid and the battery under test.
13. The apparatus for testing equivalent heat capacity inside battery of claim 9, wherein the measurement accuracy of the temperature measurement component is higher than 0.1 ℃.
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