Lithium ion battery electrode expansion measuring device

Abstract

The utility model discloses a lithium ion battery electrode expansion measuring device which comprises an upper supporting plate and a lower supporting plate which are installed in parallel up and down, and the supporting surface of the lower supporting plate is provided with a placing groove; a pressure detection device is installed over the upper supporting plate corresponding to the containing groove, a pressing plate is arranged on the lower side of the pressure detection device, a guide column is arranged on the upper side of the pressure detection device, the upper supporting plate is provided with a column hole allowing the upper end of the guide column to penetrate through and be matched in a telescopic mode, scales are arranged on the side wall of the guide column, and the upper supporting plate is provided with a driving device driving the guide column to move up and down. The device is suitable for various types of batteries, and is suitable for laboratory research and actual working conditions. The battery design is optimized, the performance and the service life of the battery are improved, and the method has important significance on the development of the battery technology.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of battery detection equipment, in particular to a kind of lithium ion battery electrode expansion measuring device. BACKGROUND

[0002] Lithium ion battery is the highest current use rate power storage equipment, is widely used in consumer electronics, electric tools and electric vehicles.Battery performance and life depend largely on the volume expansion and shrinkage of electrode material, especially in the process of charging and discharging lithium insertion and deintercalation of silicon-based negative electrode material.The volume change of electrode not only affects the structural integrity of battery, but also may endanger the overall battery safety performance.

[0003] In prior art, the expansion measurement technology of electrode expansion is complex, and the equipment is expensive, which can only be used for measuring soft package battery, limiting its application in specific research field rather than extensive research and manufacturing field. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of lithium ion battery electrode expansion measuring device, solve the complex electrode expansion measurement technology, and the application effect is single, and the problem of poor pertinence.

[0005] To solve the above technical problems, the utility model is realized by the following technical solutions:

[0006] A kind of lithium ion battery electrode expansion measuring device, including upper and lower parallel installation's upper support plate and lower support plate, upper support plate and lower support plate are supported by arc-shaped frame between, the lower support plate support surface is placed with placing groove;

[0007] The upper support plate is installed with pressure detection device in the direct upper side of placing groove, the lower side of pressure detection device has pressing plate, and the upper side has guide column, the upper support plate is provided with column hole for the upper end of guide column to pass through and telescopic cooperation, the side wall of guide column has scale, the upper support plate has the drive device for driving guide column to move up and down.

[0008] Further, the drive device includes screw rod, the upper support plate is installed with positioning plate above, for installing screw rod, the screw rod passes through positioning plate and is rotationally engaged with the passing portion of positioning plate, the upper end of guide column has screw sleeve that is connected with the lower end of screw rod, and is threadedly engaged.The upper end of screw rod has handle, and the position of screw rod passing through positioning plate is fixed with positioning sleeve.

[0009] Further, the lower support plate has a positioning groove accommodating a placing groove, the placing groove has a placing plate inside, springs are installed between the corner position of the placing plate and the bottom of the placing groove for elastic support, a slot is opened on the side wall of the placing groove, and the position corresponding to the slot of the placing groove has a positioning mark.

[0010] The utility model has the following beneficial effects: suitable for various types of batteries (button batteries, cylindrical and square shell batteries, etc.), suitable for laboratory research and practical working conditions.

[0011] In summary, the utility model provides a kind of accurate, reliable and easy-to-implement measuring equipment for lithium ion battery electrode expansion, which helps to optimize battery design, improve its performance and life, and has important significance for the development of battery technology. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used for the embodiment description.

[0013] Figure 1 The utility model structural schematic diagram.

[0014] Figure 2 The utility model screw rod and pressure detection device dismounting structure schematic diagram.

[0015] Figure 3 The utility model placing groove disassembly structure schematic diagram.

[0016] In the drawings, the upper support plate 11, the lower support plate 12, the arc-shaped frame 13, the placing groove 3, the pressure detection device 2, the pressing plate 21, the guide column 22, the column hole 14, the screw rod 4, the positioning plate 5, the handle 41, the positioning sleeve 42, the positioning groove 15, the placing plate 6, the spring 31, the slot 32, the limiting rod 61, and the limiting sleeve 33. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments.

[0018] As Figures 1-2As shown: a kind of lithium ion battery electrode expansion measuring device, including upper and lower parallelly installed upper support plate 11 and lower support plate 12, upper support plate 11 and lower support plate 12 are supported by arc frame 13, and the support surface of lower support plate 12 is placed with placing groove 3;Upper support frame and lower support frame are combined with arc frame and the side projection of the support structure is U-shaped structure.

[0019] Pressure detection device 2 is installed in the directly above of upper support plate 11 corresponding placing groove 3, and the inside of pressure sensor has pressure sensor, for accurately measuring pressure value, the lower side of pressure detection device 2 has pressing plate 21, and the upper side has guide column 22, and upper support plate 11 is provided with column hole 14 for the upper end of guide column 22 to pass through and telescopic cooperation, and the side wall of guide column 22 has scale, and upper support plate 11 has driving device for driving guide column 22 to move up and down.The cross section of guide column is square, and the corresponding column hole is square groove, and the driving device is driven to be located in the telescopic column hole.

[0020] The utility model discloses a thickness measurement for multilayer electrode sheet, so as to share the expansion degree of single electrode sheet, specifically the electrode sheet before testing is accumulated together by multilayer superposition mode, then is placed in the placing groove, pneumatic drive device makes the pressing plate close to the upper side of electrode sheet and presses, so that pressure detection device shows pressure value, the value threshold of pressure detection device is set simultaneously, and the value is recorded, and the scale value of guide column is recorded.Then the electrode sheet is assembled into battery, and multiple charge-discharge tests are carried out, after testing, the electrode sheet is disassembled and the same number of layers before testing is superimposed, is placed in the placing groove, and the pressing plate is started to press, when pressure detection device shows the same threshold value, the scale value of guide column is observed and recorded, and the scale value before is compared, and the difference between the two is the overall expansion degree, and the expansion rate of single electrode sheet can be calculated by sharing single electrode sheet.

[0021] As shown in Figure 2 Drive device includes screw rod 4, positioning plate 5 is installed above upper support plate 11, for installing screw rod 4, screw rod 4 passes through positioning plate 5 and is rotationally fitted with the passing part of positioning plate 5, and the lower end of screw rod 4 is provided with the screw sleeve of the upper end of guide column 22, and is screw fitted.The pressing degree of pressing plate is accurately controlled by screw rod, and the value of pressure detection device is adjusted.The upper end of screw rod 4 has handle 41, and positioning sleeve 42 is fixed at the position of screw rod 4 passing through positioning plate 5, for limiting screw axis rotation, and not moving up and down.

[0022] As shown in Figure 3As shown: the lower support plate 12 has a positioning groove 15 containing the placement groove 3, the inside of the placement groove 3 has a placement plate 6, and the corner position of the placement plate 6 is provided with a spring 31 between the bottom of the placement groove 3, which is used for elastic support, and the side wall of the placement groove 3 is provided with a slot 32, and the position corresponding to the slot 32 of the placement groove 3 has a positioning mark. The slot is used to observe the degree of descent of the placement plate, and the positioning mark is limited, so that the pressing force of the pressing plate can be accurately positioned. When the placement plate is lowered to the positioning mark, the value of the pressure detection device is recorded, and the accurate record is realized through double marks. The placement plate 6 is provided with a limiting rod 61 in the center, and the placement groove 3 is provided with a limiting sleeve 33 sleeving the limiting rod 61. The limiting rod 61 is used for limiting the stable movement of the placement plate up and down, and preventing the deflection phenomenon.

[0023] The dry electrode roll is pressed to a certain compaction density, and then cut into an electrode sheet with a diameter of 14 mm using a circular cutting die. At least 150 electrode sheets are prepared, and the thickness of each electrode sheet and the mass of the electrode material are measured.

[0024] Electrode processing and assembly: After the electrode sheet is dried in a vacuum oven, it is transferred to an argon-filled glove box for the assembly of the button cell. The assembled button cell is placed for 45 hours, and randomly divided into five groups, each group having at least 30 batteries.

[0025] Grouped experiments and data collection: According to different charge and discharge cycle conditions, no charge and discharge, single cycle 0% SOC, single cycle 100% SOC, 50 cycles 0% SOC, 50 cycles 100% SOC, the batteries in different groups are subjected to charge and discharge experiments. After the experiment is completed, the battery is disassembled in the glove box and cleaned with electrolyte solvent. After 30 minutes of evaporation of excess solvent, measurement is performed.

[0026] According to the data of the first group of batteries without charge and discharge, a calibration curve is established, and combined with the mass data of the electrode material, the original thickness of each electrode of the other groups is calculated. The electrode expansion rate is calculated by the formula thickness after charge and discharge cycle-original thickness / original thickness.

[0027] The embodiments are selected and specifically described in the specification in order to better explain the principles and practical applications of the utility model, so that those skilled in the art can well understand and utilize the utility model.

Claims

1. A lithium ion battery electrode expansion measuring device, characterized in that: It comprises an upper support plate (11) and a lower support plate (12) installed in parallel from top to bottom, and the upper support plate (11) and the lower support plate (12) are supported by an arc-shaped frame (13), and the lower support plate (12) is provided with a placement groove (3) on the support surface; The upper support plate (11) is provided with a pressure detection device (2) above the placement groove (3), the pressure detection device (2) is provided with a pressing plate (21) on the lower side and a guide column (22) on the upper side, the upper support plate (11) is provided with a column hole (14) for the upper end of the guide column (22) to pass through and telescopic cooperation, the side wall of the guide column (22) is provided with a scale, and the upper support plate (11) is provided with a driving device for driving the guide column (22) to move up and down.

2. The apparatus of claim 1, wherein: The driving device comprises a screw rod (4), the upper support plate (11) is provided with a positioning plate (5) above for installing the screw rod (4), the screw rod (4) passes through the positioning plate (5) and is rotationally connected with the passing part of the positioning plate (5), and the upper end of the guide column (22) is provided with a screw sleeve for sleeving the lower end of the screw rod (4) and screwing.

3. The apparatus of claim 2, wherein: The upper end of the screw rod (4) is provided with a handle (41), and the position of the screw rod (4) passing through the positioning plate (5) is fixedly provided with a positioning sleeve (42).

4. The apparatus of claim 1, wherein: The lower support plate (12) is provided with a positioning groove (15) for accommodating the placement groove (3), the placement groove (3) is provided with a placement plate (6) inside, springs (31) are arranged between the edge corner positions of the placement plate (6) and the bottom of the placement groove (3) for elastic support, the side wall of the placement groove (3) is provided with a slot (32), and the placement groove (3) is provided with a positioning mark at the position corresponding to the slot (32).

5. The apparatus of claim 4, wherein: The placement plate (6) is provided with a limiting rod (61) in the center, and the placement groove (3) is provided with a limiting sleeve (33) for sleeving the limiting rod (61).

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