CN113049971A - Internal short-circuit current testing method and system for power battery - Google Patents
Internal short-circuit current testing method and system for power battery Download PDFInfo
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- CN113049971A CN113049971A CN202110313660.5A CN202110313660A CN113049971A CN 113049971 A CN113049971 A CN 113049971A CN 202110313660 A CN202110313660 A CN 202110313660A CN 113049971 A CN113049971 A CN 113049971A
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- 238000012360 testing method Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 38
- 230000008859 change Effects 0.000 claims abstract description 27
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 238000004590 computer program Methods 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 14
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000009950 felting Methods 0.000 abstract description 4
- 238000001467 acupuncture Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- 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]
- G01R31/378—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
-
- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The invention provides a method and a system for testing internal short-circuit current of a power battery, wherein the method comprises the following steps: vertically puncturing a puncture needle from the surface of a polar plate of a battery to be tested to a preset position, wherein the puncture needle stays in the battery to be tested; charging or discharging the battery to be tested after the puncture needle is punctured to obtain a short-circuit resistor, and acquiring a temperature change value of the battery; and obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value. According to the invention, the average current value in the short circuit process in the battery is obtained by measuring the temperature rise rate of the felting needle, so that the reaction intensity in the short circuit process in different batteries can be quantitatively distinguished.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method and a system for testing internal short-circuit current of a power battery.
Background
Safety issues of automotive lithium ion batteries have been of great concern, and internal short circuits are a major cause of thermal runaway of batteries, except in the case of extreme abuse of the exterior. When the vehicle is operated at a high speed, a disaster is likely to be caused upon occurrence of an internal short circuit of the battery.
At present, relevant test standards are established at home and abroad to simulate the short circuit in the battery, including the acupuncture test of GB/T31485-. However, the acupuncture test of GB/T31485-; the blunt needle test and the round bar impact test are mainly to extrude the surface of the battery, so that the battery is tested after the occurrence of the internal short circuit, but the accuracy of the internal short circuit of the battery simulated by the mode is low, and direct measurement cannot be performed through a universal meter, a shunt, a Hall sensor and the like, so that the finally obtained internal short circuit test effect of the battery is poor, and how to better test the current in the internal short circuit process of the power battery is the difficulty of the current battery test.
Therefore, a method and a system for testing an internal short circuit current of a power battery are needed to solve the above problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an internal short-circuit current testing method and system for a power battery.
The invention provides an internal short circuit current testing method for a power battery, which comprises the following steps:
vertically puncturing a puncture needle from the surface of a polar plate of a battery to be tested to a preset position, wherein the puncture needle stays in the battery to be tested;
charging or discharging the battery to be tested after the puncture needle is punctured to obtain a short-circuit resistor, and acquiring a temperature change value of the battery;
and obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value.
According to the internal short circuit current testing method for the power battery, provided by the invention, the pricking pin vertically penetrates into a preset position from the surface of a polar plate of the battery to be tested, and the method comprises the following steps:
and vertically penetrating the pricking pin from the upper surface to the lower surface of the pole plate of the battery to be tested, or vertically penetrating the pricking pin into the battery to be tested from the surface of the pole plate of the battery to be tested.
According to the internal short circuit current testing method for the power battery, provided by the invention, the pricking pin is of an internal hollow structure, and a thermocouple is arranged in the internal hollow structure.
According to the internal short circuit current testing method for the power battery provided by the invention, the battery to be tested after the puncture needle is punctured is charged or discharged to obtain the short circuit resistance, and the method comprises the following steps:
after the puncture needle is punctured to the preset position, charging or discharging a battery to be tested after the puncture needle is punctured, and acquiring contact resistance generated when the puncture needle is in contact with the battery to be tested after the puncture needle is punctured to the battery to be tested;
and calculating the short-circuit resistance according to the resistance of the puncture needle and the contact resistance.
According to the internal short-circuit current testing method for the power battery provided by the invention, before the short-circuit resistance is calculated according to the resistance of the puncture needle and the contact resistance, the method further comprises the following steps:
and obtaining the resistance of the puncture needle according to the resistivity of the puncture needle, the puncture length and the cross-sectional area of the puncture needle, and obtaining the short-circuit resistance according to the resistance of the puncture needle and the contact resistance.
According to the internal short circuit current testing method for the power battery provided by the invention, the internal short circuit current value of the battery to be tested is obtained according to the short circuit resistance and the battery temperature change value, and the method comprises the following steps:
based on an internal short circuit current formula, obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value, wherein the internal short circuit current formula is as follows:
wherein, CnailDenotes the specific heat capacity of the puncture needle, mnailIndicating the mass of the needle, Δ TtRepresenting the value of the temperature variation, R, of the lancet during the short-circuit period tISCIs indicated as shortAnd a path resistance.
The invention also provides an internal short circuit current testing system for the power battery, which comprises the following components:
the pricking module is used for vertically pricking a pricking pin into a preset position from the surface of a polar plate of a battery to be tested, and the pricking pin stays in the battery to be tested;
the testing module is used for charging or discharging the battery to be tested after the puncture needle is punctured, acquiring a short-circuit resistor and acquiring a temperature change value of the battery;
and the processing module is used for obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of any one of the internal short circuit current testing methods for the power battery.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of any of the above-described methods for internal short circuit current testing of a power cell.
According to the internal short circuit current testing method and system for the power battery, provided by the invention, the average current value in the internal short circuit process of the battery is obtained by measuring the temperature rise rate of the felting needle, so that the reaction intensity in the internal short circuit process of different batteries can be quantitatively distinguished.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an internal short-circuit current testing method for a power battery according to the present invention;
FIG. 2 is a schematic diagram of a short circuit within a needle-punched electrochemical cell provided in accordance with the present invention;
FIG. 3 is a schematic structural diagram of an internal short-circuit current testing system for a power battery according to the present invention;
fig. 4 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
The power battery is used as a power source of the electric automobile to replace gasoline and diesel oil, wherein the lithium ion battery for the automobile is used as a novel green high-energy chemical power supply, and shows excellent performance when being applied to the electric automobile needing a high-energy high-power supply, the discharge voltage of the lithium ion battery is stable, and the storage time of the lithium ion battery has remarkable advantages. However, once the inside of the power battery is short-circuited, the energy stored in the lithium battery is rapidly released, and a large amount of heat is generated, even explosion occurs.
At present, 4 internal short circuit modes of a power battery cell mainly include an internal short circuit generated between a cathode and an anode, an internal short circuit generated between the cathode and a copper foil area, an internal short circuit generated between an aluminum foil area and the anode, and an internal short circuit generated between the aluminum foil area and the copper foil area. Therefore, simulating the short circuit in the cell essentially directly or indirectly triggers the internal short circuit loop through the above 4 different forms, so as to observe the performance of the cell to determine the safety characteristics of the cell. The invention is based on the acupuncture test, and obtains the short-circuit current in the internal short-circuit process by controlling the test method, thereby being capable of quantitatively distinguishing the reaction intensity in the short-circuit process of different batteries. The emergence condition of reaction battery short circuit that acupuncture test can be fine, when the steel needle stabbed, the steel needle provided the route of the inside short circuit of battery, and the electric energy of battery turns into heat energy to inside the storage battery, the short circuit causes concentrated outburst and the release of energy in the short time, thereby obtains interior short circuit current value according to the test and carries out the analysis to the interior short circuit condition of the battery that awaits measuring, and interior short circuit current is big more promptly, and the probability that the battery takes place to catch fire and explodes is higher. It should be noted that, the invention is described with reference to the inner short circuit condition simulated by the fact that the pricking pin vertically penetrates from the upper surface to the lower surface of the pole plate of the battery to be tested (i.e. the inner short circuit generated between the positive pole piece and the negative pole piece), and the inner short circuit current testing method provided by the invention is also applicable to other inner short circuit conditions (e.g. the pricking pin vertically penetrates into the anode inside the battery from the surface of the aluminum foil area), and the specific steps are not described again.
Fig. 1 is a schematic flow chart of an internal short-circuit current testing method for a power battery provided by the present invention, and as shown in fig. 1, the present invention provides an internal short-circuit current testing method for a power battery, including:
In the invention, the pricking pin vertically penetrates from the upper surface to the lower surface of the pole plate of the battery to be tested, namely the pricking pin penetrates from the aluminum foil area on the upper surface of the battery to be tested to the copper foil area on the lower surface of the battery to be tested. Preferably, in the invention, a clamp with a hole in the middle is used for fixing the battery to be tested, and the pretightening force ranges from 1.5 Nm to 2Nm, namely, a metal clamping plate is arranged on the upper surface and the lower surface of the battery to be tested, and symmetrical acupuncture round holes are arranged on the metal clamping plate and used for fixing the acupuncture needles to vertically penetrate from the surface of the battery to be tested to the other surface of the battery to be tested.
And 102, charging or discharging the battery to be tested after the puncture of the puncture needle, acquiring a short-circuit resistance, and collecting a temperature change value of the battery.
Fig. 2 is a schematic diagram of a short circuit in a needle-punched battery according to the present invention, which can be seen from fig. 2, in the present invention, a battery to be tested is discharged, and when the short circuit occurs in the needle-punched battery, a current flows from the inside of the battery to the negative electrode through the needle. In the invention, the short-circuit resistance is calculated by the resistance of the puncture needle and the Contact resistance (Contact resistance), then the temperature of the puncture needle in the internal short-circuit process is measured by the temperature measuring sensor, and the obtained temperature change value of the puncture needle is used as the temperature change value of the battery.
And 103, obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value.
In the invention, the ohmic heating power generated by the battery to be tested after needling is P ═ I2*RISCWherein, P is ohm thermal power, I is internal short circuit current. Further, by testing the temperature change of the puncture needle during the puncture process, the heat release power P-C can be calculatednailmnailΔTtWherein, CnailM is the specific heat capacity of the needlenailIs the mass of the needle, Δ TtAn internal short circuit current formula is constructed and obtained according to the ohmic thermal power and the heat release power formula for the temperature change value of the puncture needle in the short circuit time period t, so that the internal short circuit current value of the battery to be tested is obtained according to the short circuit resistor and the temperature change value of the battery based on the internal short circuit current formula, wherein the internal short circuit current formula is as follows:
wherein, CnailDenotes the specific heat capacity of the puncture needle, mnailIndicating the mass of the needle, Δ TtRepresenting the value of the temperature variation, R, of the lancet during the short-circuit period tISCRepresenting the short circuit resistance.
According to the internal short circuit current testing method for the power battery, the average current value in the battery internal short circuit process is obtained by measuring the temperature rise rate of the felting needle, so that the reaction intensity in different battery internal short circuit processes can be quantitatively distinguished.
On the basis of the above embodiment, the vertically penetrating the pricking pin into the preset position from the surface of the plate of the battery to be tested includes:
and vertically penetrating the pricking pin from the upper surface to the lower surface of the pole plate of the battery to be tested, or vertically penetrating the pricking pin into the battery to be tested from the surface of the pole plate of the battery to be tested.
According to the invention, the pricking pins are pricked into different areas of the battery to be tested according to the preset positions, so that various short circuit conditions in the battery can be simulated.
On the basis of the above embodiment, the pricking pin is of an inner hollow structure, and a thermocouple is arranged in the inner hollow structure.
In the invention, the adopted pricking pin is a high-temperature resistant steel pin with a hollow structure, a K-type thermocouple can be placed in the hollow structure, and the temperature response frequency of the thermocouple is less than 10 ms. The diameter of the needling is 5-8 mm, the needling speed is controlled to be 0.1-25 mm/s, and the displacement control precision is +/-0.1 mm.
On the basis of the above embodiment, the charging or discharging the battery to be tested after the pricking pin is pricked to obtain the short-circuit resistance includes:
after the puncture needle is punctured to the preset position, charging or discharging a battery to be tested after the puncture needle is punctured, and acquiring contact resistance generated when the puncture needle is in contact with the battery to be tested after the puncture needle is punctured to the battery to be tested;
and calculating the short-circuit resistance according to the resistance of the puncture needle and the contact resistance.
In the present invention, the contact resistance can be measured by a milliohm meter, a volt-ampere meter, an ampere-potentiometer, or the like.
On the basis of the above embodiment, before calculating the short-circuit resistance according to the resistance of the lancet and the contact resistance, the method further comprises:
and obtaining the resistance of the puncture needle according to the resistivity of the puncture needle, the puncture length and the cross-sectional area of the puncture needle, and obtaining the short-circuit resistance according to the resistance of the puncture needle and the contact resistance.
In the present invention, the lancet is of its ownResistance Rnailρ L/A, where ρ is the resistivity of the lancet; l is the length of the puncture needle for puncturing the battery, namely the length of the puncture needle staying in the battery after the puncture needle punctures the battery; a is the cross-sectional area of the lancet. After the contact resistance and the puncture needle resistance are obtained, the two are summed to obtain the short-circuit resistance RISC＝Rnail+Rcnt。
Fig. 3 is a schematic structural diagram of an internal short-circuit current testing system for a power battery provided by the present invention, and as shown in fig. 3, the present invention provides an internal short-circuit current testing system for a power battery, which includes a needling module 301, a testing module 302 and a processing module 303, wherein the needling module 301 is configured to vertically pierce a needle from a plate surface of a battery to be tested to a predetermined position, and the needle stays in the battery to be tested; the test module 302 is used for charging or discharging the battery to be tested after the puncture needle is punctured, acquiring a short-circuit resistance, and acquiring a temperature change value of the battery; the processing module 303 is configured to obtain an internal short circuit current value of the battery to be tested according to the short circuit resistance and the battery temperature variation value.
According to the internal short circuit current testing system for the power battery, provided by the invention, the average current value in the battery internal short circuit process is obtained by measuring the temperature rise rate of the felting needle, so that the reaction intensity in different battery internal short circuit processes can be quantitatively distinguished.
The system provided by the present invention is used for executing the above method embodiments, and for the specific processes and details, reference is made to the above embodiments, which are not described herein again.
Fig. 4 is a schematic structural diagram of an electronic device provided in the present invention, and as shown in fig. 4, the electronic device may include: a processor (processor)401, a communication interface (communication interface)402, a memory (memory)403 and a communication bus 404, wherein the processor 401, the communication interface 402 and the memory 403 complete communication with each other through the communication bus 404. Processor 401 may invoke logic instructions in memory 403 to perform a method for internal short circuit current testing of a power cell, the method comprising: vertically puncturing a puncture needle from the surface of a polar plate of a battery to be tested to a preset position, wherein the puncture needle stays in the battery to be tested; charging or discharging the battery to be tested after the puncture needle is punctured to obtain a short-circuit resistor, and acquiring a temperature change value of the battery; and obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value.
In addition, the logic instructions in the memory 403 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform the internal short circuit current testing method for a power battery provided by the above methods, the method comprising: vertically puncturing a puncture needle from the surface of a polar plate of a battery to be tested to a preset position, wherein the puncture needle stays in the battery to be tested; charging or discharging the battery to be tested after the puncture needle is punctured to obtain a short-circuit resistor, and acquiring a temperature change value of the battery; and obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to execute the internal short circuit current testing method for a power battery provided in the above embodiments, the method including: vertically puncturing a puncture needle from the surface of a polar plate of a battery to be tested to a preset position, wherein the puncture needle stays in the battery to be tested; charging or discharging the battery to be tested after the puncture needle is punctured to obtain a short-circuit resistor, and acquiring a temperature change value of the battery; and obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An internal short circuit current testing method for a power battery is characterized by comprising the following steps:
vertically puncturing a puncture needle from the surface of a polar plate of a battery to be tested to a preset position, wherein the puncture needle stays in the battery to be tested;
charging or discharging the battery to be tested after the puncture needle is punctured to obtain a short-circuit resistor, and acquiring a temperature change value of the battery;
and obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value.
2. The method for testing the internal short circuit current of the power battery as claimed in claim 1, wherein the step of vertically penetrating the puncture needle from the surface of the pole plate of the battery to be tested to a preset position comprises the following steps:
and vertically penetrating the pricking pin from the upper surface to the lower surface of the pole plate of the battery to be tested, or vertically penetrating the pricking pin into the battery to be tested from the surface of the pole plate of the battery to be tested.
3. The method for testing the internal short circuit current of the power battery as claimed in claim 1, wherein the pricking pin is an internal hollow structure, and a thermocouple is arranged in the internal hollow structure.
4. The method for testing the internal short-circuit current of the power battery according to claim 1, wherein the step of charging or discharging the battery to be tested after the puncture needle is punctured to obtain the short-circuit resistance comprises the following steps:
after the puncture needle is punctured to the preset position, charging or discharging a battery to be tested after the puncture needle is punctured, and acquiring contact resistance generated when the puncture needle is in contact with the battery to be tested after the puncture needle is punctured to the battery to be tested;
and calculating the short-circuit resistance according to the resistance of the puncture needle and the contact resistance.
5. The internal short circuit current testing method for a power battery as claimed in claim 4, wherein before calculating the short circuit resistance based on the resistance of the lancet and the contact resistance, the method further comprises:
and obtaining the resistance of the puncture needle according to the resistivity of the puncture needle, the puncture length and the cross-sectional area of the puncture needle, and obtaining the short-circuit resistance according to the resistance of the puncture needle and the contact resistance.
6. The method for testing the internal short-circuit current of the power battery according to claim 1, wherein the obtaining of the internal short-circuit current value of the battery to be tested according to the short-circuit resistance and the battery temperature variation value comprises:
based on an internal short circuit current formula, obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value, wherein the internal short circuit current formula is as follows:
wherein, CnailDenotes the specific heat capacity of the puncture needle, mnailIndicating the mass of the needle, Δ TtRepresenting the value of the temperature variation, R, of the lancet during the short-circuit period tISCRepresenting the short circuit resistance.
7. An internal short circuit current testing system for a power cell, comprising:
the pricking module is used for vertically pricking a pricking pin into a preset position from the surface of a polar plate of a battery to be tested, and the pricking pin stays in the battery to be tested;
the testing module is used for charging or discharging the battery to be tested after the puncture needle is punctured, acquiring a short-circuit resistor and acquiring a temperature change value of the battery;
and the processing module is used for obtaining the internal short circuit current value of the battery to be tested according to the short circuit resistor and the battery temperature change value.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method for testing internal short circuit current of a power battery according to any one of claims 1 to 6 when executing the computer program.
9. A non-transitory computer readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps of the internal short circuit current testing method for a power battery according to any one of claims 1 to 6.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842043A (en) * | 2016-12-28 | 2017-06-13 | 国联汽车动力电池研究院有限责任公司 | For the method for testing that lithium ion battery safe class is evaluated |
| CN109444746A (en) * | 2018-10-29 | 2019-03-08 | 天津力神电池股份有限公司 | Measure the method that battery carries out internal current size when lancing test |
| CN110968968A (en) * | 2019-12-05 | 2020-04-07 | 西南交通大学 | Thermal runaway simulation method based on needling internal short circuit lithium ion battery |
| US20200166580A1 (en) * | 2018-01-31 | 2020-05-28 | Lg Chem, Ltd. | Secondary battery safety evaluation method and device |
| CN112378951A (en) * | 2020-10-23 | 2021-02-19 | 欣旺达电动汽车电池有限公司 | Method for testing specific heat capacity of battery, electronic device and computer-readable storage medium |
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2021
- 2021-03-24 CN CN202110313660.5A patent/CN113049971A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842043A (en) * | 2016-12-28 | 2017-06-13 | 国联汽车动力电池研究院有限责任公司 | For the method for testing that lithium ion battery safe class is evaluated |
| US20200166580A1 (en) * | 2018-01-31 | 2020-05-28 | Lg Chem, Ltd. | Secondary battery safety evaluation method and device |
| CN109444746A (en) * | 2018-10-29 | 2019-03-08 | 天津力神电池股份有限公司 | Measure the method that battery carries out internal current size when lancing test |
| CN110968968A (en) * | 2019-12-05 | 2020-04-07 | 西南交通大学 | Thermal runaway simulation method based on needling internal short circuit lithium ion battery |
| CN112378951A (en) * | 2020-10-23 | 2021-02-19 | 欣旺达电动汽车电池有限公司 | Method for testing specific heat capacity of battery, electronic device and computer-readable storage medium |
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