CN108267695B - Analysis and test method based on forced lithium battery internal short circuit - Google Patents
Analysis and test method based on forced lithium battery internal short circuit Download PDFInfo
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- CN108267695B CN108267695B CN201711407212.1A CN201711407212A CN108267695B CN 108267695 B CN108267695 B CN 108267695B CN 201711407212 A CN201711407212 A CN 201711407212A CN 108267695 B CN108267695 B CN 108267695B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 74
- 238000004458 analytical method Methods 0.000 title claims abstract description 19
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 54
- 238000003825 pressing Methods 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000012544 monitoring process Methods 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 238000001931 thermography Methods 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims description 42
- 230000007613 environmental effect Effects 0.000 claims description 24
- 230000008859 change Effects 0.000 claims description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 18
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 238000004887 air purification Methods 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 15
- 230000009286 beneficial effect Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000000428 dust Substances 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract 1
- 238000011160 research Methods 0.000 description 4
- 238000007619 statistical method Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009781 safety test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Secondary Cells (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention relates to an analysis and test method based on forced lithium battery internal short circuit, which comprises the following steps: the lithium battery provided with the metal sheet is placed on the lower portion of the pressing device in the closed box, internal changes of the lithium battery are recorded by controlling various testing conditions, data are summarized, and the specific relation between the forced internal short circuit and relevant factors is analyzed. The method simulates impurities such as metal dust, crushed material particles and the like which can enter the battery cell in the manufacturing process, and indirectly reflects the process of generating internal short circuit by utilizing the thermal imaging principle; the monitoring terminal records the condition and the process of forcing the internal short circuit, thereby being beneficial to summarizing and obtaining the system and ensuring the safety protection in the production process of the battery.
Description
Technical Field
The invention relates to the technical field of battery cell safety testing, in particular to an analysis testing method based on forced short circuit in a lithium battery.
Background
In the manufacturing and processing process of the lithium battery core, impurities such as metal dust, crushed particles and the like which are possibly introduced penetrate through the diaphragm between the positive electrode and the negative electrode to cause internal short circuit, and the potential danger is generated in the battery production process. The existing testing device cannot scientifically explain the specific situation of the internal short circuit of the battery, and cannot show the relationship between the internal short circuit and various factors (such as the external pressure, the testing environment temperature, the charging current and the like). Therefore, workers in the industry cannot distinguish and pick out the electric core with potential safety hazard in time, and fire and explosion accidents are easy to happen in the production process or in the transportation process, so that personal and property losses are caused.
Disclosure of Invention
The invention provides an analysis and test method based on forced lithium battery internal short circuit, which solves the technical problems.
The technical scheme for solving the technical problems is as follows: an analysis test method based on forced lithium battery internal short circuit comprises the following steps:
step 4, starting the voltmeter or the ammeter, the pressing device and the thermal imaging detector positioned in the closed box;
and 5, performing data statistics and analysis according to the pressing speed, the first preset environmental condition, the temperature change data inside the winding core and the voltage data or the current data, wherein the temperature change data is acquired by the monitoring terminal through the thermal imaging detector, the temperature change data inside the winding core is acquired by the monitoring terminal, the voltage data is acquired by the voltmeter and is between the positive electrode and the negative electrode, and the current data is acquired by the ammeter and is the current data inside the winding core.
The invention has the beneficial effects that: the potential danger degree of the battery cell during the internal short circuit caused by the fact that the diaphragm is pierced between the positive electrode and the negative electrode is simulated by impurities such as metal dust, crushed aggregates and the like which can enter the battery cell in the manufacturing process; observing and recording the heat energy change inside the winding core by using a thermal imaging principle, and indirectly reflecting the process of generating internal short circuit; the monitoring terminal records the conditions and the process (pressure, temperature in the box, current and the like) of forcing the internal short circuit, summarizes and summarizes different test results to obtain system data, and is favorable for safety protection in the production process of the battery.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, before the step 1, the method further includes:
and 7, controlling the environment adjusting assembly to adjust the environment condition in the closed box to a second preset environment condition through the monitoring terminal.
The invention has the further beneficial effects that: the surface of the roll core is marked, the lithium battery is placed in the closed box, the lithium battery is not easy to remember which side the metal sheet is placed on by people due to the fact that the lithium battery is turned over and the like, and therefore the lithium battery is marked before being placed in the closed box, and subsequent operation in the closed box is facilitated.
Further, the second preset environmental condition includes: the temperature is 20 plus or minus 5 ℃, and the dew point is not more than minus 25 ℃.
The invention has the further beneficial effect that the suitable environment of the battery is set firstly, which is beneficial to prolonging the service life of the battery.
Further, the step 1 comprises:
step 1.1, placing a lithium battery with a metal sheet arranged between a positive electrode and a negative electrode into a closed box, and placing for a preset time;
step 1.2, if the lithium battery is not combusted, taking out a winding core of the lithium battery from a shell of the lithium battery, and placing the winding core under a pressing device in a mode that one surface where the indication mark is located faces upwards;
and step 1.3, connecting the positive and negative electrode tabs of the lithium battery with the voltmeter or the ammeter through a clamp.
The invention has the further beneficial effects that: after the lithium battery is placed in the closed box, the lithium battery is placed in a suitable environment of the closed box for a period of time, if the lithium battery turns red or burns, the battery is indicated to be short-circuited, the battery is unqualified, the subsequent test is finished, and if the battery is normal, the subsequent test is carried out. In addition, the lithium battery is connected with the voltmeter and the ammeter, so that the voltage change or the current change in the lithium battery can be collected in real time in the whole test process for statistical analysis and research. In addition, according to the indicating mark, the one side at sheetmetal place is confirmed to the efficient to place the core with the indicating mark up, the device pushes down and is convenient for the sheetmetal to pierce through the diaphragm in the core and cause internal short circuit pushing down the in-process.
Further, the preset time is 30-60 minutes.
The invention has the further beneficial effects that: according to the type and the test requirement of the lithium battery, the lithium battery is placed for 30-60 minutes before testing so as to ensure that the lithium battery for test research is normal.
Further, the environmental conditioning assembly includes: the air conditioner comprises a temperature adjusting unit, a dew point adjusting unit and an air purifying unit;
the step 3 specifically includes:
through monitor terminal predetermines the speed of pushing down of push down the device is for predetermineeing the speed, predetermines environmental condition in the seal box is first predetermined environmental condition, and control temperature regulation unit, dew point adjusting unit and air purification unit in the seal box make environmental condition in the seal box reaches first predetermined environmental condition.
The invention has the further beneficial effects that: before the test, a control single-factor variable method is used for analyzing and forcing the specific relation between the internal short circuit and relevant factors, namely the influence of the factors to be counted on the internal short circuit is analyzed according to reality, before the test, the set pressing speed and environmental conditions are changed, so that a large number of tests are compared according to the specific data or relevant data change collected by the monitoring terminal, and system data are obtained.
Further, the method further comprises:
and 8, when the voltage value acquired by the monitoring terminal reaches a voltage threshold value, the acquired current value reaches a current threshold value or a pressure value obtained by calculation according to the pressing speed reaches a pressure threshold value, closing the pressing device through the monitoring terminal.
The invention has the further beneficial effects that: and setting a threshold value according to the test precision and range so as to improve the precision of the analysis test.
Further, the metal sheet is a nickel sheet.
Further, the closed box is a glove box.
The invention has the further beneficial effects that: the glove box is convenient to operate, and the internal environmental conditions are easy to control.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic flow chart of an analysis test method based on forced short circuit inside a lithium battery according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an analysis test method based on forced short circuit in a lithium battery according to another embodiment of the present invention;
fig. 3 is a schematic flowchart of step 110 in an analysis test method based on forced short circuit inside a lithium battery according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of an analysis test method based on forced short circuit inside a lithium battery according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a testing apparatus used in an analysis testing method based on forced short circuit inside a lithium battery according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of the inside of a lithium battery in an analysis test method based on forced short circuit inside the lithium battery according to another embodiment of the present invention.
In the drawings, the elements represented by the various reference numbers are listed below:
1. the device comprises a glove box, a dew-point meter, a vacuum detector, a glove box inlet, a transition passage, a forced internal short-circuit testing box, a pressing device, a vent, a thermal imaging detector, a clamp, a monitoring terminal, a coil core, a 121, positive and negative electrode tabs, a 122, a diaphragm, a 123, an active material layer, a 124, a positive electrode current collector layer, a 13 and a nickel sheet, wherein the glove box inlet is connected with the vacuum detector, the transition passage is connected with the forced internal short-circuit testing box, the forced internal short-circuit testing box is.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example one
An analysis and test method 100 based on forced short circuit inside lithium battery, as shown in fig. 1, includes:
and 110, placing a winding core of the lithium battery under a pressing device in a closed box, and connecting the winding core with a voltmeter or an ammeter, wherein a metal sheet is arranged between the anode and the cathode of the winding core.
And step 120, adjusting the bottom of the pressing device to be in contact with the upper surface of the winding core through a monitoring terminal positioned outside the closed box.
And step 130, presetting the pressing speed of the pressing device and controlling the environment adjusting component to adjust the environment condition in the closed box to a first preset environment condition through the monitoring terminal.
And step 140, starting a voltmeter or an ammeter, a pressing device and a thermal imaging detector in the closed box.
And 150, performing data statistical analysis according to the pressing speed, the first preset environmental condition, the temperature change data inside the winding core and the voltage data or the current data, wherein the temperature change data is the temperature change data inside the winding core acquired by the monitoring terminal through the thermal imaging detector, the voltage data is the voltage data between the positive electrode and the negative electrode acquired by the voltmeter, and the current data is the current data inside the winding core acquired by the ammeter.
The potential danger degree of the battery cell during the internal short circuit caused by the fact that the diaphragm is pierced between the positive electrode and the negative electrode due to impurities such as metal dust and crushed particles which can enter the battery cell in the manufacturing process is simulated; observing and recording the heat energy change inside the winding core by using a thermal imaging principle, and indirectly reflecting the process of generating internal short circuit; the monitoring terminal records the conditions and the process (pressure, temperature in the box, current and the like) of forcing the internal short circuit, summarizes and summarizes different test results to obtain system data, and is favorable for safety protection in the production process of the battery.
Example two
On the basis of the first embodiment, as shown in fig. 2, before step 110, the method 100 further includes:
and step 160, taking the winding core out of the shell of the fully-charged lithium battery, placing the metal sheet between the positive electrode and the negative electrode, making an indication mark at the position, corresponding to the metal sheet, on the surface of the winding core, and then placing the winding core into the shell for restoration.
And 170, controlling the environment adjusting assembly through the monitoring terminal to adjust the environment condition in the closed box to a second preset environment condition.
The surface of the roll core is marked, the lithium battery is placed in the closed box, the lithium battery is not easy to remember which side the metal sheet is placed on by people due to the fact that the lithium battery is turned over and the like, and therefore the lithium battery is marked before being placed in the closed box, and subsequent operation in the closed box is facilitated.
In addition, the recovered lithium battery can be placed in a sealing bag to prevent the electrolyte in the lithium battery from volatilizing.
EXAMPLE III
On the basis of the first embodiment or the second embodiment, the second preset environmental condition includes: the temperature is 20 plus or minus 5 ℃, and the dew point is not more than minus 25 ℃.
Setting a suitable environment for a battery first helps to extend the life of the battery.
Example four
On the basis of any one of the first to third embodiments, as shown in fig. 3, the step 110 includes:
and step 111, placing the lithium battery with the metal sheet arranged between the anode and the cathode into a closed box, and placing for a preset time.
And 112, if the lithium battery is not combusted, taking out a winding core of the lithium battery from a shell of the lithium battery, and placing the winding core under the pressing device in a mode that one surface where the indication mark is located faces upwards.
And 113, connecting the positive and negative electrode tabs of the lithium battery with a voltmeter or an ammeter through a clamp.
After the lithium battery is placed in the closed box, the lithium battery is placed in a suitable environment of the closed box for a period of time, if the lithium battery turns red or burns, the battery is indicated to be short-circuited, the battery is unqualified, the subsequent test is finished, and if the battery is normal, the subsequent test is carried out. In addition, the lithium battery is connected with the voltmeter and the ammeter, so that the voltage change or the current change in the lithium battery can be collected in real time in the whole test process for statistical analysis and research.
If the lithium battery is placed in the sealing bag before being placed in the sealed box, the lithium battery is taken out of the sealing bag and then the rolled core of the lithium battery is taken out of the shell of the lithium battery after the lithium battery is checked to be not burned in step 112. In addition, according to the indicator, the side at the metal sheet place is confirmed to the efficient to place the core with the indicator upwards, the device pushes down and is convenient for the metal sheet to pierce through the diaphragm in the core and cause internal short circuit pushing down the in-process.
The preset time in the step 111 is 30-60 minutes.
According to the type and the test requirement of the lithium battery, the lithium battery is placed for 30-60 minutes before testing so as to ensure that the lithium battery for test research is normal.
EXAMPLE five
On the basis of any one of the first to fourth embodiments, the environment conditioning assembly includes: a temperature adjusting unit, a dew point adjusting unit, and an air purifying unit.
Step 130 specifically includes: through monitor terminal, predetermine the speed of pushing down of push down device and be predetermined speed, predetermine the environmental condition in the seal box and be first predetermined environmental condition to control temperature regulation unit, dew point adjusting unit and the air purification unit in the seal box, make the environmental condition in the seal box reach first predetermined environmental condition.
Before the test, a control single-factor variable method is used for analyzing and forcing the specific relation between the internal short circuit and relevant factors, namely the influence of the factors to be counted on the internal short circuit is analyzed according to reality, before the test, the set pressing speed and environmental conditions are changed, so that a large number of tests are compared according to the specific data or relevant data change collected by the monitoring terminal, and system data are obtained.
EXAMPLE six
On the basis of the first to fifth embodiments, as shown in fig. 4, the method 100 further includes:
and step 180, when the voltage value acquired by the monitoring terminal reaches a voltage threshold value, the acquired current value reaches a current threshold value or the pressure value calculated according to the pressing speed reaches a pressure threshold value, closing the pressing device through the monitoring terminal.
And setting a threshold value according to the test precision and range so as to improve the precision of the analysis test.
It should be noted that, when any one of the voltage value, the current value and the pressure value reaches the threshold value, the pressing device is closed through the monitoring terminal, so that the pressing device stops working, and the accuracy and the utilization rate of the acquired data are improved. Because the corresponding thresholds are different according to different experimental requirements, when the thresholds are exceeded, the acquired data are not suitable for statistical analysis, which causes waste of the acquired data and even increases the burden of data processing.
EXAMPLE seven
On the basis of the first embodiment to the sixth embodiment, the metal sheet is a nickel sheet, and the closed box is a glove box.
The glove box is convenient to operate, and the internal environmental conditions are easy to control.
For example, a test apparatus as shown in fig. 5. Under the environment of temperature 20 +/-5 ℃ and dew point less than or equal to minus 25 ℃ (measured by a dew point instrument 2) (in a vacuum glove box, the vacuum degree is measured by a vacuum detector). The battery was fully charged and placed in glove box 1 for pre-test preparation (preparation for nickel plate, operating system on, instrument normal use, etc.). The core was taken out of the case, and an L-shaped nickel plate (thickness 0.2mm, side length of each side of the L-shape 1mm, width 0.1mm) was interposed between the positive and negative electrodes, as shown in fig. 6, 13 being a nickel plate, 121 being positive and negative electrode tabs, 122 being a separator, 123 being an active material layer, and 124 being a positive electrode current collector layer.
After the nickel sheet is put into the sample bag, the position corresponding to the nickel sheet on the surface of the roll core is marked by an oil pen, the roll core 12 is reset, and the sample bag is filled to avoid the volatilization of the electrolyte. The winding core 12 is rapidly put into the forced internal short circuit test box 6 through a transition channel 5 (the glove box and the forced internal short circuit test box form a closed box) of the glove box 1 and the forced internal short circuit test box 6, and the whole process is completed within 30 minutes. The bag is stored in a forced internal short circuit test box 6 at 45 + -15 min, the winding core 12 is taken out of the bag with the label facing upwards and placed directly under the hold-down device 7, and the hold-down device 7 is adjusted to bring the pressure device close to the winding core (infinitely close, but not yet pressing the winding core). The condition and the environment required by the test are adjusted through the monitoring terminal 11, the pressing speed (0.1 mm/s) is set, the clamp 10 is connected to the positive pole lug and the negative pole lug, the clamp is connected with the voltmeter or the ammeter (used for displaying the voltage and current changes in the pressing process, and in addition, the ammeter displays the magnitude of the charging current and is used for simulating the safety problem when the test is continuously used through the internal short-circuit battery cell), the initial temperature of the forced internal short-circuit test box 6 is set, the thermal imaging detector 9 is started, the whole device is finally started, and the summary test data is recorded through the monitoring terminal 11.
During the test, the test was stopped until the following situation was reached: the cell voltage drops to 50mv, or the pressure reaches 800N (prismatic cell, stop when pressure reaches 400N).
The thermal imaging detector 9 is used for transmitting the temperature change condition inside the battery, the monitoring terminal records and summarizes process data, and each variable in the test process is compared to obtain a conclusion; meanwhile, the monitoring terminal can control the changes of single factors such as pressure, current and temperature in the test box, the influence of each factor is analyzed, the test is more persuasive, the variables are slowly increased, and scientific and standard test data are finally obtained.
The thermal imaging principle is used for indirectly reflecting the internal change of the forced internal short circuit battery cell through the temperature change; controlling a single-factor variable method, and analyzing a specific relation between the forced internal short circuit and related factors; and recording specific data or changes in the process by using the monitoring terminal, and comparing a large number of tests to obtain system data. The method can systematically perform forced internal short circuit test and obtain the conclusion of the system, and in addition, the battery is disassembled in the glove box, so that the pole piece can be prevented from being oxidized or combusted due to the contact with water in the air.
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 that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. An analysis test method based on forced lithium battery internal short circuit is characterized by comprising the following steps:
step 1, placing a winding core of a lithium battery under a pressing device in a closed box, and connecting the winding core with a voltmeter or an ammeter, wherein a metal sheet is arranged between a positive electrode and a negative electrode of the winding core;
step 2, adjusting the bottom of the pressing device to be in contact with the upper surface of the winding core through a monitoring terminal located outside the closed box;
step 3, presetting the pressing speed of the pressing device and controlling an environment adjusting assembly to adjust the environment condition in the closed box to a first preset environment condition through the monitoring terminal;
step 4, starting the voltmeter or the ammeter, the pressing device and the thermal imaging detector positioned in the closed box;
step 5, performing data statistics and analysis according to the pressing speed, a first preset environmental condition, temperature change data inside the winding core and voltage data or current data, wherein the temperature change data is the temperature change data inside the winding core acquired by the monitoring terminal through the thermal imaging detector, the voltage data is the voltage data between the positive electrode and the negative electrode acquired by the voltmeter, and the current data is the current data inside the winding core acquired by the ammeter;
before step 1, the method further comprises:
step 6, taking the winding core out of the fully charged lithium battery shell, placing the metal sheet between the positive electrode and the negative electrode, making an indication mark at a position corresponding to the metal sheet on the surface of the winding core, and then putting the winding core into the shell for restoration;
step 7, controlling the environment adjusting assembly through the monitoring terminal to adjust the environment condition in the closed box to a second preset environment condition;
the step 1 comprises the following steps:
step 1.1, placing a lithium battery with a metal sheet arranged between a positive electrode and a negative electrode into a closed box, and placing for a preset time;
step 1.2, if the lithium battery is not combusted, taking out a winding core of the lithium battery from a shell of the lithium battery, and placing the winding core under a pressing device in a mode that one surface where the indication mark is located faces upwards;
and step 1.3, connecting the positive and negative electrode tabs of the lithium battery with the voltmeter or the ammeter through a clamp.
2. The method as claimed in claim 1, wherein the second preset environmental condition comprises: the temperature is 20 plus or minus 5 ℃, and the dew point is not more than minus 25 ℃.
3. The method for analyzing and testing the internal short circuit of the lithium battery as claimed in claim 1, wherein the preset time is 30-60 minutes.
4. The method for analyzing and testing the internal short circuit of the lithium battery according to any one of the claims 1 to 3, wherein the environmental conditioning component comprises: the air conditioner comprises a temperature adjusting unit, a dew point adjusting unit and an air purifying unit;
the step 3 specifically includes:
through monitor terminal predetermines the speed of pushing down of push down the device is for predetermineeing the speed, predetermines environmental condition in the seal box is first predetermined environmental condition, and control temperature regulation unit, dew point adjusting unit and air purification unit in the seal box make environmental condition in the seal box reaches first predetermined environmental condition.
5. The method for analyzing and testing the internal short circuit of the lithium battery according to any one of the claims 1 to 3, wherein the method further comprises the following steps:
and 8, when the voltage value acquired by the monitoring terminal reaches a voltage threshold value, the acquired current value reaches a current threshold value or a pressure value obtained by calculation according to the pressing speed reaches a pressure threshold value, closing the pressing device through the monitoring terminal.
6. The method as claimed in any one of claims 1 to 3, wherein the metal sheet is a nickel sheet.
7. The analytical test method based on forced short circuit inside lithium battery as recited in any one of claims 1 to 3, wherein the closed box is a glove box.
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| CN109061507A (en) * | 2018-08-31 | 2018-12-21 | 宁德新能源科技有限公司 | Battery test system and battery testing method |
| CN111722129B (en) * | 2020-06-01 | 2023-08-15 | 国联汽车动力电池研究院有限责任公司 | Battery micro-short circuit detection method and system |
| CN112230160B (en) * | 2020-09-22 | 2023-10-20 | 国联汽车动力电池研究院有限责任公司 | Method and device for testing short circuit positioning in battery cell |
| CN112630664B (en) * | 2020-12-18 | 2023-11-03 | 广东风华新能源股份有限公司 | Lithium battery short-circuit failure analysis method and detection device |
| CN113189488A (en) * | 2021-05-06 | 2021-07-30 | 佛山科学技术学院 | Battery SOH evaluation method based on charging temperature image |
| CN116736184B (en) * | 2023-08-15 | 2023-11-03 | 韵量燃料电池(广东)有限公司 | Method and device for detecting short circuit of single cell of electric pile |
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| CN104062598B (en) * | 2014-06-30 | 2017-03-01 | 上海德朗能动力电池有限公司 | A kind of lithium ion battery forces internal short-circuit security assessment method |
| CN104597410B (en) * | 2015-01-27 | 2018-12-07 | 肇庆市风华锂电池有限公司 | A kind of short-circuit detecting device and method of lithium ion battery |
| CN204515054U (en) * | 2015-01-28 | 2015-07-29 | 合肥国轩高科动力能源股份公司 | A kind of lithium battery coiling core short-circuit test device |
| CN204758796U (en) * | 2015-04-24 | 2015-11-11 | 惠州市豪鹏科技有限公司 | A battery test apparatus |
| CN106124998B (en) * | 2016-08-10 | 2018-09-25 | 惠州出入境检验检疫局检验检疫综合技术中心 | A kind of lithium battery interior short circuit test method |
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