CN112285567A - Battery cell calendar life testing device and method - Google Patents
Battery cell calendar life testing device and method Download PDFInfo
- Publication number
- CN112285567A CN112285567A CN202011127607.8A CN202011127607A CN112285567A CN 112285567 A CN112285567 A CN 112285567A CN 202011127607 A CN202011127607 A CN 202011127607A CN 112285567 A CN112285567 A CN 112285567A
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- 238000012360 testing method Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000012790 adhesive layer Substances 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims 1
- 238000004088 simulation Methods 0.000 abstract description 6
- 229920000297 Rayon Polymers 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
-
- 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]
- G01R31/3644—Constructional arrangements
-
- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The invention discloses a device and a method for testing the calendar life of a battery cell, wherein the device comprises a clamping mechanism, a first buffer sheet and a second buffer sheet; the first buffer sheet is positioned on the outer side of one side surface of the electric core, the second buffer sheet is positioned on the outer side of the other side surface of the electric core, and one side surface and the other side surface of the electric core are two opposite side surfaces; the clamping mechanism is used for abutting against the first buffer sheet and the second buffer sheet on one side away from the battery cell so as to limit the battery cell by the first buffer sheet and the second buffer sheet; the shape and the material of the first buffer sheet and the second buffer sheet are the same as those of the buffer piece between two adjacent electric cores in the battery module, and the thickness of the buffer piece is 1/2 of the thickness of the buffer piece between two adjacent electric cores in the battery module. Through the fixed electric core of electric core limit simulation mechanism, can simulate the state of electric core in the battery module at electric core calendar life test, difference between state and the actual operating condition when can reduce electric core calendar life test improves the rate of accuracy of electric core calendar life test.
Description
Technical Field
The invention relates to the field of battery detection, in particular to a device and a method for testing the calendar life of a battery core.
Background
With the gradual enhancement of people's environmental awareness and the development of lithium ion power batteries, electric vehicles such as electric automobiles, electric bicycles, electric airplanes and the like are more and more widely used; for the electric vehicles, the power battery pack has the function and significance of lifting the power source, and the performance of the power battery pack directly influences the service life, the manufacturing cost, the consumption experience and the like of the electric vehicles; how to accurately know the service life of the battery cell is crucial to the use of the battery cell, the service life of the battery cell comprises two parts, namely the calendar life and the cycle life of the battery cell, and in the prior art, the calendar life of the battery cell is usually tested in a free state; however, the battery cell bulges during use, and mutual acting forces exist between the battery cell and between the battery cell and a structural member in a fixed constraint space; the free state test data cannot truly reflect the state of the battery core in the battery module; particularly, at high temperature, the battery cell is obviously swelled in the storage process, and the deviation between the calendar life test data of the battery cell in a free state and the actual situation is larger.
Disclosure of Invention
The invention mainly aims to provide a device and a method for testing the calendar life of a battery cell, and aims to solve the technical problem that the deviation between the calendar life test data of the battery cell in the existing free state and the actual situation is overlarge.
The invention provides a battery cell calendar life testing device which comprises a clamping mechanism, a first buffer sheet and a second buffer sheet, wherein the first buffer sheet is arranged on the clamping mechanism; the first buffer sheet is positioned on the outer side of one side surface of the electric core, the second buffer sheet is positioned on the outer side of the other side surface of the electric core, and one side surface and the other side surface of the electric core are two opposite side surfaces; the clamping mechanism is used for abutting against the first buffer sheet and the second buffer sheet on one side away from the battery cell so as to limit the battery cell by the first buffer sheet and the second buffer sheet; the shape and the material of first buffer piece and second buffer piece are the same with bolster shape and material between two adjacent electric cores in the battery module, and the thickness of first buffer piece and second buffer piece is 1/2 of bolster thickness between two adjacent electric cores in the battery module respectively.
Further, the clamping mechanism comprises a first end plate, a second end plate and a distance adjusting mechanism; the first end plate is positioned on one side, away from the battery core, of the first buffer sheet, and the second end plate is positioned on one side, away from the battery core, of the second buffer sheet; the distance adjusting mechanism is connected with the first end plate and the second end plate respectively and used for adjusting the distance between the first end plate and the second end plate.
Further, the distance adjusting mechanism comprises a plurality of screw rods and nuts corresponding to the screw rods, the screw rods respectively penetrate through the first end plate and the second end plate, and the screw rods are in threaded connection with the corresponding nuts.
Further, the distance adjustment mechanism includes:
the positioning piece is fixedly connected with one of the first end plate and the second end plate;
the moving piece is fixedly connected with the other one of the first end plate and the second end plate;
the moving piece is connected with the positioning piece in a sliding mode, so that the distance between the first end plate and the second end plate is adjusted when the moving piece and the positioning piece are displaced relatively.
Furthermore, the first buffer sheet and the second buffer sheet are made of hard silicon rubber materials.
Furthermore, a first limiting mechanism is arranged on the first end plate and used for limiting the first buffer sheet; and a second limiting mechanism is arranged on the second end plate and used for limiting a second buffer sheet.
Furthermore, the first limiting mechanism comprises a first limiting bulge, the first limiting bulge is arranged at the lower end of the first end plate, which faces the side face of the first buffer sheet, and the first limiting bulge is used for supporting the first buffer sheet below; the second limiting mechanism comprises a limiting protrusion, the second limiting protrusion is arranged at the lower end, facing the side face of the second buffer sheet, of the second end plate, and the second limiting protrusion is used for supporting the second buffer sheet below.
Further, the first limiting mechanism comprises a first adhesive layer, the first adhesive layer is arranged on the side face, facing the first buffer sheet, of the first end plate, and the first adhesive layer is used for adhering the first end plate and the first buffer sheet; the second limiting mechanism comprises a second adhesive layer, the second adhesive layer is arranged on the side face, facing the second buffer sheet, of the second end plate, and the second adhesive layer is used for adhering the second end plate and the second buffer sheet.
The application also provides a battery cell calendar life testing method, and the battery cell calendar life testing device is applied to fix the tested battery cell in the testing process.
The invention has the beneficial effects that: through the fixed electric core of electric core limit simulation mechanism, can be at the state of electric core calendar life test simulation electric core in the battery module, difference between state and the actual working condition when can reduce electric core calendar life test improves the rate of accuracy of electric core calendar life test, solves the too big technical problem of calendar life test data and the actual conditions deviation of current free state's electric core.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a device for testing a calendar life of a battery cell according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the invention provides a device for testing the calendar life of a battery cell, which comprises a clamping mechanism, a first buffer sheet 1 and a second buffer sheet 2; the first buffer sheet 1 is positioned on the outer side of one side surface of the electric core, the second buffer sheet 2 is positioned on the outer side of the other side surface of the electric core, and one side surface and the other side surface of the electric core are two opposite side surfaces; the clamping mechanism is used for abutting against the first buffer sheet 1 and the second buffer sheet 2 on one side departing from the battery cell 5 so as to enable the first buffer sheet 1 and the second buffer sheet 2 to limit the battery cell 5; shape and material of first buffer piece 1 and second buffer piece 2 are the same with shape and material of bolster between two adjacent electric cores in the battery module, and the thickness of first buffer piece 1 and second buffer piece 2 is 1/2 of bolster thickness between two adjacent electric cores in the battery module respectively.
Specifically, can make first buffer plate 1 and second buffer plate 2 press from both sides tightly with electric core 5 through clamping mechanism, the bolster of electric core both sides in the simulation battery module through first buffer plate 1 and second buffer plate 2, through the fixed electric core 5 of the spacing analog mechanism of electric core 5, can simulate the state of electric core 5 in the battery module at electric core calendar life test, state and actual working condition difference between the state when can reducing electric core calendar life test, improve the accuracy of electric core calendar life test, solve the too big technical problem of calendar life test data and actual conditions deviation of electric core 5 of current free state.
Further, the clamping mechanism includes a first end plate 3, a second end plate 4, and a distance adjustment mechanism; the first end plate 3 is positioned on one side, away from the battery cell 5, of the first buffer sheet 1, and the second end plate 4 is positioned on one side, away from the battery cell 5, of the second buffer sheet 2; the distance adjusting mechanism is connected with the first end plate 3 and the second end plate 4 respectively, and is used for adjusting the distance between the first end plate 3 and the second end plate 4.
Specifically, distance adjustment mechanism extrudes corresponding first buffer piece 1 and second buffer piece 2 and then spacing electric core 5 respectively through driving first end plate 3 and second end plate 4, simulate the condition of electric core 5 in the battery module, adjust the distance between first end plate 3 and second end plate 4 through distance adjustment mechanism in addition, can make the spacing analog mechanism of electric core 5 be suitable for the electric core 5 of different specifications and the first buffer piece 1 and the second buffer piece 2 of different thickness, simulate out the spacing environment of electric core 5 in the battery module of different specifications.
Further, in some embodiments, the distance adjusting mechanism includes a plurality of screws 6 and nuts corresponding thereto, the screws 6 respectively penetrate through the first end plate 3 and the second end plate 4, and the screws 6 are in threaded connection with the corresponding nuts.
The distance between the first end plate 3 and the second end plate 4 can be adjusted by adjusting the relative position of the nut on the screw rod 6; it should be said that, in some embodiments, some screws 6 are located below the clamped battery cell 5, and play a role in bearing the battery cell 5, so that the first buffer sheet 1 and the second buffer sheet 2 do not need a large force to extrude the battery cell 5, and the battery cell 5 can be limited, thereby facilitating simulation of a loose condition of the battery cell 5 in the battery module.
Further, in other embodiments, the distance adjustment mechanism includes a positioning member and a moving member; the positioning piece is fixedly connected with one of the first end plate 3 and the second end plate 4; the moving piece is fixedly connected with the other one of the first end plate 3 and the second end plate 4; the moving member is slidably connected to the positioning member so as to adjust the distance between the first end plate 3 and the second end plate 4 when the moving member and the positioning member are relatively displaced.
Adjust the distance between first end plate 3 and the second end plate 4 through adjusting relative displacement between moving member and the setting element, can also include the screens piece, the screens piece is used for injecing the position of moving member, conveniently adjusts the distance between first end plate 3 and the second end plate 4, and then adjusts the distance between first buffer piece 1 and second buffer piece 2.
Further, the first buffer sheet 1 and the second buffer sheet 2 are made of hard silicon rubber materials. Can make first buffer piece 1 and second buffer piece 2 have certain deformability, simulate the effect of bolster in the battery module.
Further, a first limiting mechanism is arranged on the first end plate 3 and used for limiting the first buffer sheet 1; and a second limiting mechanism is arranged on the second end plate 4 and used for limiting the second buffer sheet 2. Can conveniently fix a position first buffer chip 1 and second buffer chip 2 when installing electric core 5 through first stop gear and second stop gear, improve work efficiency and user experience.
Further, in some embodiments, the first limiting mechanism includes a first limiting protrusion, the first limiting protrusion is disposed at a lower end of the first end plate 3 facing the side surface of the first buffer sheet 1, and the first limiting protrusion is used for supporting the first buffer sheet 1 below; the second limiting mechanism comprises a limiting protrusion, the second limiting protrusion is arranged at the lower end, facing the side face of the second buffer sheet 2, of the second end plate 4, and the second limiting protrusion is used for supporting the second buffer sheet 2 below. Be used for bearing first buffer plate 1 and the spacing arch of second in the below through first spacing arch and be used for bearing second buffer plate 2 in the below, make things convenient for first buffer plate 1 and second buffer plate 2 spacing, in addition in order not to obstruct for other directions, also make things convenient for the installation and the replacement of first buffer plate 1 and second buffer plate 2, make the spacing analog mechanism convenient to use of electricity core 5.
Further, the first limiting mechanism comprises a first adhesive layer, the first adhesive layer is arranged on the side, facing the first buffer sheet 1, of the first end plate 3, and the first adhesive layer is used for adhering the first end plate 3 and the first buffer sheet 1; second stop gear includes second viscose layer, and second end plate 4 orientation second buffer patch 2 sides are located to the second viscose layer, and second viscose layer is used for pasting second end plate 4 and second buffer patch 2. Specific first viscose layer and second viscose layer are for the viscose that can reuse, make things convenient for first buffer piece 1 and second buffer piece 2's installation and replacement.
The application also provides a battery cell calendar life testing method, and the battery cell calendar life testing device is applied to fix the tested battery cell 5 in the testing process.
Specifically, in this embodiment, the method for testing the calendar life of the battery core includes:
setting the initial pretightening force to 300-3000N, and fixing the battery cell 5 between the two end plates according to the sequence of the first end plate 3, the first buffer sheet 1, the battery cell 5, the second buffer sheet 2 and the second end plate 4. The battery cell calendar life test is carried out according to the following procedures:
the method comprises the following steps: and calibrating the capacity of the battery cell 5.
Placing the battery cell 5 in an environment with the temperature of 25 ℃, standing for more than 3 hours to achieve thermal equilibrium; charging to the upper limit voltage of 4.3V of the battery cell 5 by adopting a 1C constant current, then charging to the capacity of less than or equal to 0.05C by adopting a constant voltage, standing for 5 minutes, then discharging to the lower limit voltage of 2.8V of the battery cell 5 by adopting 1C, and recording the discharge capacity of the battery cell 5; marking the capacity calibration time as C0; the environment in which the battery cell 5 is placed can be simulated by the environment box, and the charging and discharging of the battery cell 5 can be simulated by the charging and discharging simulation system.
Step two: cell 5 is adjusted to a fixed SOC.
Discharging by using 1C0, wherein the discharging time is t minutes, and the SOC of the battery cell 5 is (1-t/60) × 100; when t is 3, the SOC of the corresponding battery cell 5 is 95%; when t is 30, the SOC of the corresponding battery cell 5 is 50%; when t is 54, the SOC of the corresponding battery cell 5 is 10%; in this embodiment, when t is 3, the SOC of the corresponding battery cell 5 is 95%.
Step three: placing the battery cell 5 of the calendar life testing device with the battery cell into an environment box, for example, setting the temperature of the environment box to be 45 ℃ and the time to be 1 month;
and repeating the step one to the step three n times, and recording the measured capacity of the battery cell 5 as C1, C2, … and Cn. The calendar life decay of the battery cell 5 is 1-Cn/C0;
the following table is a comparison of the calendar life of the battery cell 5 tested in the free state of the battery cell 5 in this embodiment.
The specific test results are as follows:
through the above table, can see out the 5 calendar life-span of electric core that record behind the use electric core calendar life-span testing arrangement, with the 5 calendar life-span of electric core of testing under the free state, have comparatively obvious difference, after having simulated the restriction condition of battery module to electric core 5, electric core calendar life-span test is more accurate, has solved the too big technical problem of calendar life-span test data and actual conditions deviation of electric core 5 of current free state.
Under the constraint condition of setting for electric core 5, under different temperatures and different SOCs, the calendar life of electric core 5 is further established about the calendar life model of expansion space, temperature and time of electric core 5, and data support is provided for the modeling of follow-up module level life and module design.
The invention has the beneficial effects that: through the fixed electric core 5 of the 5 spacing analog mechanism of electric core, can simulate the state of electric core 5 in the battery module at electric core calendar life test, difference between state and the actual work state when can reduce electric core calendar life test, improve the rate of accuracy of electric core calendar life test, solve the too big technical problem of calendar life test data and the actual conditions deviation of current free state's electric core 5.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A battery cell calendar life testing device is characterized by comprising a clamping mechanism, a first buffer sheet and a second buffer sheet; the first buffer sheet is positioned on the outer side of one side surface of the electric core, the second buffer sheet is positioned on the outer side of the other side surface of the electric core, and one side surface and the other side surface of the electric core are two opposite side surfaces; the clamping mechanism is used for abutting against the first buffer sheet and the second buffer sheet on one side away from the battery cell so as to enable the first buffer sheet and the second buffer sheet to limit the battery cell; shape and material of first buffer piece and second buffer piece are the same with material with the battery module between the adjacent two electricity core bolster shape, just the thickness of first buffer piece and second buffer piece is 1/2 of bolster thickness between the adjacent two electricity cores respectively in the battery module.
2. The cell calendar life testing device of claim 1, wherein the clamping mechanism comprises a first end plate, a second end plate, and a distance adjustment mechanism; the first end plate is positioned on one side, away from the battery core, of the first buffer sheet, and the second end plate is positioned on one side, away from the battery core, of the second buffer sheet; the distance adjusting mechanism is respectively connected with the first end plate and the second end plate and used for adjusting the distance between the first end plate and the second end plate.
3. The battery cell calendar life testing device of claim 2, wherein the distance adjusting mechanism comprises a plurality of screws and nuts corresponding to the screws, the screws respectively penetrate through the first end plate and the second end plate, and the screws are in threaded connection with the corresponding nuts.
4. The cell calendar life testing device of claim 2, wherein the distance adjustment mechanism comprises:
the positioning piece is fixedly connected with one of the first end plate and the second end plate;
the moving piece is fixedly connected with the other one of the first end plate and the second end plate;
the moving piece is connected with the positioning piece in a sliding mode, so that the distance between the first end plate and the second end plate is adjusted when the moving piece and the positioning piece are displaced relatively.
5. The battery cell calendar life testing device of claim 1, wherein the first buffer sheet and the second buffer sheet are made of hard silicone rubber materials.
6. The battery cell calendar life testing device of claim 2, wherein a first limiting mechanism is arranged on the first end plate, and the first limiting mechanism is used for limiting the first buffer sheet; and a second limiting mechanism is arranged on the second end plate and used for limiting the second buffer sheet.
7. The battery cell calendar life testing device of claim 6, wherein the first limiting mechanism comprises a first limiting protrusion, the first limiting protrusion is arranged at the lower end of the first end plate, which faces the side surface of the first buffer sheet, and the first limiting protrusion is used for supporting the first buffer sheet below; the second limiting mechanism comprises a limiting protrusion, the second limiting protrusion is arranged on the second end plate and faces towards the lower end of the side face of the second buffer sheet, and the second limiting protrusion is used for supporting the second buffer sheet below.
8. The battery cell calendar life testing device of claim 6, wherein the first limiting mechanism comprises a first adhesive layer, the first adhesive layer is arranged on the first end plate and faces the side face of the first buffer sheet, and the first adhesive layer is used for adhering the first end plate and the first buffer sheet; the second limiting mechanism comprises a second adhesive layer, the second adhesive layer is arranged on the second end plate and faces the side face of the second buffer sheet, and the second adhesive layer is used for adhering the second end plate and the second buffer sheet.
9. A method for testing the calendar life of a battery cell, which is characterized in that the device for testing the calendar life of the battery cell according to any one of claims 1 to 8 is applied to fix the tested battery cell in the testing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127607.8A CN112285567A (en) | 2020-10-20 | 2020-10-20 | Battery cell calendar life testing device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127607.8A CN112285567A (en) | 2020-10-20 | 2020-10-20 | Battery cell calendar life testing device and method |
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| CN112285567A true CN112285567A (en) | 2021-01-29 |
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| CN202011127607.8A Pending CN112285567A (en) | 2020-10-20 | 2020-10-20 | Battery cell calendar life testing device and method |
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