CN110208711B - Method for on-line testing stress condition of pole piece in charging and discharging processes of cylindrical battery - Google Patents
Method for on-line testing stress condition of pole piece in charging and discharging processes of cylindrical battery Download PDFInfo
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- CN110208711B CN110208711B CN201910406773.2A CN201910406773A CN110208711B CN 110208711 B CN110208711 B CN 110208711B CN 201910406773 A CN201910406773 A CN 201910406773A CN 110208711 B CN110208711 B CN 110208711B
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- battery
- pressure sensor
- pole piece
- charging
- pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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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
Abstract
The invention discloses a method for detecting the pressure applied to an internal pole piece in the charging and discharging circulation process of a cylindrical battery on line, which is characterized in that a pressure sensor which is composed of insulating substances and does not participate in the chemical reaction in the battery is arranged in the cylindrical battery pole group winding process, an insulated output lead connected with the pressure sensor is connected to the outside of the battery and is connected with a data collecting system for collecting pressure data on line, and the pressure sensor is used for monitoring the stress condition of the pole piece at different diameters in the cylindrical battery on line and collecting data for subsequent analysis in the charging and discharging circulation process of the battery. The invention can effectively monitor the stress change condition of the pole pieces in the pole group in the battery through the pressure signal so as to realize real-time online monitoring of the battery.
Description
Technical Field
The invention relates to the technical field of testing in battery production, in particular to a method for testing stress condition of a pole piece in the charging and discharging process of a cylindrical battery on line.
Background
In recent years, lithium ion batteries are widely applied to the electric vehicle market, and Tesla electric vehicles adopting cylindrical lithium ion batteries have a large market share. The service life of a common household electric vehicle battery is required to meet the service life of 10-15 years, so the service life of the battery is concerned. The service life of the battery is not only related to a chemical system, but also inseparable from the structural design, and at present, researches find that the uneven stress of pole pieces at various positions in the battery is one of important factors causing local lithium analysis to influence the cycle performance of the battery. Because the pole piece can be along with the constant emergence inflation of charge-discharge number of times in the lithium ion battery cycle process, the pole piece that receives the structure constraint is along with the extrusion force crescent that the number of times of charge-discharge increases, and cylindrical battery generally adopts steel shell and size fixed, and the utmost point group center is hollow design, and the change difference of external pressure is very big in the utmost point group, and this kind of atress inequality influences electric core circulation performance. In order to improve the pressure unevenness caused by the increase of the charging and discharging times, the winding tension of the pole group and the amount of reserved space in the structural design can be adjusted. These improvements are adjusted based on pressure data relating to the pressure applied to the pole pieces of the pole pack during charging and discharging of the battery. No method of testing has been reported.
Disclosure of Invention
The invention aims to provide a method for testing the stress condition of pole pieces in the charging and discharging processes of a cylindrical battery on line, in particular to an on-line monitoring method for pressure change between the pole pieces in the charging and discharging processes of the battery, aiming at the technical defects in the prior art.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a method for on-line testing pole piece stress condition in the process of charging and discharging cylindrical battery is characterized in that a pressure sensor which is composed of insulating substances and does not participate in chemical reaction inside the battery is arranged inside a cylindrical battery pole group in the winding process, an insulating output lead connected with the pressure sensor is connected to the outside of the battery and is connected with a data collecting system which collects pressure data on line, and the pressure sensor is used for on-line monitoring pole piece stress conditions at different diameters inside the cylindrical battery and collecting data in the charging and discharging circulation process of the battery.
Preferably, the pressure sensor has a C-shaped ring structure.
Preferably, the pressure sensor comprises an insulating hard substrate, a pressure-sensitive material coated on the insulating hard substrate and an insulated output wire connected with the pressure-sensitive material.
Preferably, the thickness of the insulating hard base material is 0.05-0.3mm, the diameter of the barrel is 0.3-20.3mm, the arc length of the C-shaped opening is 1-3mm, and the thickness of the pressure-sensitive material coating is 0.1-0.5 mm.
The pressure sensor is inserted in the position away from the center of the pole group of the battery and different radius positions and is tightly contacted with the surrounding pole pieces.
Preferably, when the pressure sensor is arranged, the cylindrical battery pole group is wound to the diameter of the position needing to be tested, and then the pressure sensor is inserted into the diaphragm of the battery through the notch and then continuously wound until the winding is finished.
Preferably, after winding is finished, drilling a hole in an explosion-proof aluminum plate of the battery cap, leading an insulated output wire connected with the pressure sensor out of the hole, injecting liquid into the battery and sealing the battery, plugging the hole led out by the insulated output wire with strong glue after sealing, charging the battery after the strong glue is completely cured, performing charge-discharge cycle test on the battery after normal aging according to current required by actual application, and synchronously receiving pole piece pressure data of a measured position.
Preferably, the battery is first charged and discharged with a current of less than 0.2C.
Compared with the prior art, the invention has the beneficial effects that:
the manufactured online testing device is placed in a pole group of the cylindrical battery, signals are transmitted to the outside of the sealed cylindrical battery through the transmission lead, and the stress change condition of pole pieces in the pole group in the battery is monitored through pressure signals in the normal charge and discharge process of the cylindrical battery.
Drawings
FIG. 1 is a schematic diagram of a pressure sensor;
FIG. 2 is a longitudinal cross-sectional view of a circular-type battery containing a pressure sensor;
FIG. 3 is a transverse cross-sectional view of a circular-type cell containing a pressure sensor;
FIG. 4 is a data collection schematic of a pole piece pressure data collection system.
In the figure: 1. the battery comprises a hard insulating base material, 2. a pressure sensitive material, 3. a pressure sensor, 4. a battery pole group, 5. a battery shell, 6. an insulating output lead and 7. a battery cap.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1-4, the method for on-line testing the stress condition of the pole piece in the charging and discharging process of the cylindrical battery of the present invention is to arrange a ring-shaped pressure sensor 3 with a gap inside the cylindrical battery, which is made of insulating materials that do not participate in the chemical reaction inside the battery, in the winding process of the battery pole group 4 of the cylindrical battery, and an insulated output lead 6 (pressure sensor signal wire) connected with the pressure sensor 3 is connected to the outside of the battery and is connected with a data collecting system for on-line collecting pressure data, so as to on-line monitor the stress condition of the pole piece at different diameters inside the cylindrical battery and collect data for subsequent analysis in the charging and discharging cycle process of the battery.
Preferably, the pressure sensor is of a C-shaped annular structure, and the pressure sensor is convenient to mount in the manufacturing process of the battery by being arranged in the C-shaped annular structure.
Preferably, the pressure sensor can be an insulated output lead 6 which comprises an insulated hard substrate 1, a pressure sensitive material 2 (pressure sensitive material) coated on the inner side of the insulated hard substrate and connected with the pressure sensitive material.
Preferably, the thickness of the insulating hard base material is 0.05-0.3mm, the diameter or the barrel diameter is 0.3-20.3mm, the arc length of the C-shaped opening of the pressure sensor is 1-3mm, and the thickness of the pressure-sensitive material coating is 0.1-0.5 mm.
The pressure sensor 3 can be inserted in the center of the pole group of the battery and at different radius positions, and is in close contact with the surrounding pole pieces.
The data collection system comprises a data collector and a data processing system, wherein the data collector is connected with the other end of the insulated output wire to transmit the adopted pressure data to the data processing system for analysis, and then the data processing system processes the pressure data and outputs a test result.
The specific preferred steps of the present invention are carried out as follows:
s101: firstly, winding a cylindrical battery pole group to the diameter of a position needing to test pressure, inserting a diaphragm of the battery into a C opening of a C-shaped pressure sensor with a corresponding diameter, and continuing to wind until the winding is finished.
S201: drilling a hole on an explosion-proof aluminum plate of a battery cap 7, leading an insulated output lead 6 connected with a pressure sensor 3 out of the drilled hole, injecting liquid into the battery and sealing the battery, plugging the hole led out by the insulated output lead with super glue after sealing, and charging the battery after the super glue is completely cured.
S301: and charging and discharging the battery for the first time by using the current less than 0.2C, performing charge and discharge cycle test on the battery after normal aging according to the current required by practical application, and synchronously receiving the pole piece pressure data of the measured position.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A method for on-line testing pole piece stress condition in the process of charging and discharging a cylindrical battery is characterized in that a pressure sensor which is composed of insulating substances and does not participate in chemical reaction in the battery is arranged in the cylindrical battery pole group winding process, an insulating output lead connected with the pressure sensor is connected to the outside of the battery and is connected with a data collecting system for on-line collecting pressure data, and the data collecting system is used for on-line monitoring pole piece stress conditions at different diameters in the cylindrical battery and collecting data in the process of charging and discharging circulation of the battery; the pressure sensor is of a C-shaped annular structure; the pressure sensor is inserted in the position away from the center of the pole group of the battery and different radius positions and is tightly contacted with the surrounding pole pieces; when the pressure sensor is arranged, the cylindrical battery pole group is wound to the diameter of the position needing to test the pressure, and then the pressure sensor is inserted into the diaphragm of the battery through the notch and then continuously wound until the winding is finished.
2. The method for on-line testing of stress condition of pole piece in charging and discharging process of cylindrical battery as claimed in claim 1, wherein said pressure sensor comprises an insulating hard substrate, a pressure sensitive material coated on the insulating hard substrate and an insulated output wire connected.
3. The method for on-line testing the stress condition of the pole piece in the charging and discharging processes of the cylindrical battery as claimed in claim 2, wherein the thickness of the insulating hard base material is 0.05-0.3mm, the barrel diameter is 0.3-20.3mm, the arc length at the C-shaped opening is 1-3mm, and the thickness of the pressure-sensitive material coating is 0.1-0.5 mm.
4. The method for on-line testing the stress condition of the pole piece in the charge and discharge process of the cylindrical battery as claimed in claim 3, wherein after the winding is finished, a hole is drilled on an explosion-proof aluminum plate of a battery cap, an insulated output lead connected with the pressure sensor is led out from the hole, the battery is injected with liquid and sealed, the hole led out by the insulated output lead is plugged by the battery after the sealing, the battery is charged after the strong glue is completely cured, the battery after normal aging is subjected to charge and discharge cycle testing according to the current required by practical application, and the pole piece pressure data of the measured position is synchronously received.
5. The method for on-line testing of the stress condition of the pole piece in the charging and discharging process of the cylindrical battery as claimed in claim 4, wherein the battery is charged and discharged for the first time with a current less than 0.2C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910406773.2A CN110208711B (en) | 2019-05-15 | 2019-05-15 | Method for on-line testing stress condition of pole piece in charging and discharging processes of cylindrical battery |
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| CN201910406773.2A CN110208711B (en) | 2019-05-15 | 2019-05-15 | Method for on-line testing stress condition of pole piece in charging and discharging processes of cylindrical battery |
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| CN110208711A CN110208711A (en) | 2019-09-06 |
| CN110208711B true CN110208711B (en) | 2021-04-16 |
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| CN111697280B (en) * | 2020-06-22 | 2021-07-09 | 清华大学 | Battery device capable of monitoring electrode stress change in real time, battery adopting device and application of device |
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| CN110208711A (en) | 2019-09-06 |
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Effective date of registration: 20230228 Address after: 300457 No. 38, Haitai South Road, Binhai high tech Industrial Development Zone (outer ring), Binhai New Area, Tianjin Patentee after: TIANJIN LISHEN BATTERY JOINT-STOCK Co.,Ltd. Patentee after: Tianjin Juyuan New Energy Technology Co.,Ltd. Address before: No.38, South Haitai Road, Binhai high tech Industrial Development Zone, Binhai New Area, Tianjin Patentee before: TIANJIN LISHEN BATTERY JOINT-STOCK Co.,Ltd. |