Lithium ion battery pole piece infiltration test device
By designing a lithium-ion battery pole infiltration testing device including bottom plate, liquid injection plate, cover plate and sealing plate, the complex and contaminated problems of existing testing methods are solved, and more accurate infiltration testing is achieved and environmental pollution is reduced. Effect.
Patent Information
- Application Number
- CN202420655653.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-01
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-01
AI Technical Summary
The existing lithium-ion battery pole infiltration testing methods have problems such as complex operation, high environmental humidity requirements, inaccurate test results, and electrolyte contamination, and lack of unified standard testing devices.
A lithium-ion battery pole infiltration test device is designed, including a base plate, a liquid injection plate, a cover plate and a sealing plate. It is connected by a positioning member. A liquid injection hole and a scale line are provided on the liquid injection plate, and an observation hole is provided in the cover plate. , The sealing plate can block the direct contact between the electrolyte and the outside world, reducing environmental pollution and interference.
The device simplifies operation, improves test accuracy, reduces interference from external factors and electrolyte volatilization, reduces environmental pollution, and can accurately verify the wetting effect and absorption rate of the electrode sheet material on the electrolyte.
Smart Images
Figure CN222189066U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wettability testing, and in particular relates to a lithium ion battery pole piece infiltration testing device. Background Art
[0002] Lithium-ion batteries have the advantages of high operating voltage, large specific capacity, long cycle life, no memory effect and environmental friendliness, and are currently the most widely used chemical energy storage method. At the same time, with the rising demand for new energy and sustainable energy applications, lithium-ion batteries face an urgent need to further improve their performance in order to meet the higher requirements of power-type and energy-type energy storage systems in terms of energy density, safety, and cycle characteristics.
[0003] The wettability of the electrolyte directly affects the performance of the battery, because the uneven wetting of the electrode will lead to uneven distribution of current density and uneven formation of SEI film. The degree of electrode wetting will affect the performance of the battery. First, after the battery cell is discharged, there is material adhering to the diaphragm. This is because the uneven electrolyte wetting causes the local impedance to be too high, and the corresponding heat release is also large, resulting in local failure. Secondly, when the negative electrode of the battery is fully charged, the bubbles in the battery cell cannot be discharged during the injection process due to insufficient electrolyte infiltration, and the gas enrichment generated during the formation process cannot be removed. The lithium ions cannot be fully inserted into the material in the bubble area, resulting in insufficient local lithium insertion. Therefore, it is very important to test the wettability of lithium-ion battery electrodes.
[0004] At present, there are many methods for testing the wettability of electrode plates, and the test devices used are different, and there is no unified standard. For example, the patent document with publication number CN113188957A discloses a method for testing the electrolyte wettability of the electrode plates of lithium-ion secondary batteries. Under a constant humidity and temperature environment, two smooth clamps with scales are used to clamp the electrode plate to be tested, and then one end of the electrode plate is inserted into the electrolyte. The area of the electrode plate wetted by the electrolyte after a preset soaking time is recorded in real time, and then the area of the electrode plate wetted by the electrolyte per unit time is calculated, that is, the electrolyte wettability of the electrode plate to be tested is calculated. This test method has high requirements on environmental humidity; the tester holds the clamp to operate, and the clamping force will be different, which affects the accuracy of the test results; the electrolyte evaporates into the environment and pollutes the test environment. For another example, the patent document with publication number CN113991198A discloses a lithium-ion battery electrolyte infiltration detection method, which sets the battery infiltration environment, charges and forms batteries under different infiltration conditions, draws the battery cell formation charging dQ / dV curve, obtains the VC film formation potential, i.e., the peak intensity, and determines the electrolyte infiltration condition inside the battery cell by comparing the formation curves of the battery cell after different infiltration times. The entire operation process of this test method is cumbersome and the test efficiency is low.
[0005] Based on this, the applicant believes that it is necessary to propose a pole piece wetting test device that is easy to operate, reduces interference from external factors, and provides more accurate test results. Utility Model Content
[0006] The technical problem to be solved by the utility model is to provide a lithium ion battery pole piece infiltration test device in view of the deficiencies of the prior art.
[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:
[0008] A lithium-ion battery pole piece infiltration test device comprises: a bottom plate, the upper surface of the bottom plate is connected to a liquid injection plate, a pole piece to be tested is placed between the bottom plate and the liquid injection plate, a liquid injection hole is arranged on the liquid injection plate, the upper surface of the liquid injection plate is connected to a cover plate, a scale line is arranged on the lower surface of the liquid injection plate, an observation hole is arranged in the cover plate, the upper surface of the cover plate is connected to a sealing plate, the bottom plate and the cover plate are connected by a positioning piece, and the liquid injection plate and the sealing plate are transparent parts respectively.
[0009] Optionally, more than two first positioning holes are set on the base plate, and more than two second positioning holes are set on the cover plate, the positions of the first positioning holes correspond to the second positioning holes, and the positioning member connects the base plate and the cover plate through the first positioning holes and the second positioning holes, and limits the sealing plate.
[0010] Optionally, there are more than two positioning members, and the positioning members can be selected from bolts, positioning rods or positioning columns, and the diameter of the positioning members is 2-20 mm.
[0011] Optionally, a circular scale line is provided on the lower surface of the liquid injection plate with the liquid injection hole as the center, and scale values are marked on the circular scale line.
[0012] Optionally, the upper surface area of the bottom plate, the lower surface area of the liquid injection plate and the area of the observation hole are respectively larger than the area of the electrode to be tested.
[0013] Optionally, the cross-sectional area of the injection hole is smaller than the area of the electrode to be tested, and smaller than the area of a circle enclosed by the maximum scale line of the circular scale lines.
[0014] Optionally, the diameter of the injection hole is 5-20 mm, and the thickness of the injection plate is 4-20 mm.
[0015] Optionally, a sealing ring is embedded around the observation hole, and the wire diameter of the sealing ring is 1.0~5.0mm.
[0016] Optionally, the cover plate has a thickness of 8 to 20 mm.
[0017] Optionally, the sealing plate has a thickness of 4 to 20 mm.
[0018] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0019] The utility model provides a lithium-ion battery pole piece infiltration test device based on the above technical scheme, which can effectively solve the shortcomings of the prior art, is easy to operate, can reduce the interference of the external environment on the test results, improve the test accuracy, and reduce the pollution to the test environment.
[0020] When the utility model device is used, the electrode to be tested is placed centrally on the bottom plate; the injection plate is pressed on the electrode to be tested, and then the cover plate inlaid with a sealing ring is covered on the injection plate; an appropriate amount of electrolyte is injected into the injection hole of the injection plate, and then the sealing plate is covered, so that the direct connection between the electrolyte and the external environment can be blocked, and the probability of the electrolyte absorbing moisture in the test environment can be effectively reduced, and the electrolyte can be prevented from volatilizing to the test environment during the infiltration process, reducing pollution to the environment and reducing potential harm to the test personnel. The operator can observe the infiltration of the electrolyte in real time through the sealing plate and record the test value of the circular scale line.
[0021] The device of the utility model can accurately verify the wetting effect of the electrode material on the electrolyte, accurately verify the rate at which the electrode material absorbs the electrolyte, effectively reduce the probability of the electrolyte absorbing moisture in the test environment, minimize the volatilization of the electrolyte, and effectively reduce the pollution of the electrolyte to the test environment. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0023] Figure 1 : An exploded view of the utility model lithium-ion battery pole piece infiltration test device;
[0024] Figure 2 : A schematic diagram of the structure of the utility model lithium ion battery pole piece infiltration test device;
[0025] Figure 3 : A schematic diagram of the structure of the liquid injection plate of the utility model;
[0026] Figure 4 : Schematic diagram of testing the electrode wetting effect using the device of the utility model;
[0027] Figure 5: A graph showing the wetting effect of different pole pieces tested over time using the device of the utility model, wherein the horizontal axis represents the wetting time and the vertical axis represents the wetting scale value;
[0028] Among them, 1. bottom plate; 2. liquid injection plate; 3. electrode to be tested; 4. liquid injection hole; 5. cover plate; 6. circular scale line; 7. observation hole; 8. sealing plate; 9. positioning piece; 10. first positioning hole; 11. second positioning hole; 12. sealing ring; 13. electrolyte. DETAILED DESCRIPTION
[0029] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.
[0030] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.
[0031] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0032] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0033] like Figure 1-4As shown, a lithium-ion battery electrode piece infiltration test device comprises: a bottom plate 1, the upper surface of the bottom plate 1 is connected to a liquid injection plate 2, a pole piece 3 to be tested is placed between the bottom plate 1 and the liquid injection plate 2, a liquid injection hole 4 is arranged on the liquid injection plate 2, the upper surface of the liquid injection plate 2 is connected to a cover plate 5, a circular scale line 6 is arranged on the lower surface of the liquid injection plate 2, an observation hole 7 is arranged in the cover plate 5, the upper surface of the cover plate 5 is connected to a sealing plate 8, the bottom plate 1 and the cover plate 5 are connected by a positioning member 9, and the liquid injection plate 2 and the sealing plate 8 are transparent parts respectively.
[0034] like Figure 1 As shown, more than two first positioning holes 10 are set on the base plate 1, and more than two second positioning holes 11 are set on the cover plate 5. The positions of the first positioning holes correspond to the second positioning holes. The positioning member connects the base plate 1 and the cover plate 5 through the first positioning holes and the second positioning holes, and limits the sealing plate 8.
[0035] In a specific embodiment, four first positioning holes 10 are arranged on the bottom plate 1 , and four second positioning holes 11 are arranged on the cover plate 5 .
[0036] like Figure 1 As shown, there are more than two positioning pieces, and the positioning pieces may be bolts, positioning rods or positioning columns, and the diameter of the positioning pieces is 2 to 20 mm.
[0037] In a specific embodiment, there are four positioning members, and the number of the positioning members 9 is the same as the number of the first positioning holes and the number of the second positioning holes.
[0038] In the present invention, the material of the bottom plate 1 can be stainless steel or other materials that will not chemically corrode with the electrolyte. The liquid injection plate 2 and the sealing plate 8 can be made of corrosion-resistant transparent glass, but are not limited thereto.
[0039] like Figure 3 As shown, a circular scale line 6 is provided on the lower surface of the liquid injection plate 2 with the liquid injection hole 4 as the center, and scale values are marked on the circular scale line 6 .
[0040] like Figure 1 As shown, the upper surface area of the bottom plate 1, the lower surface area of the liquid injection plate 2 and the area of the observation hole 7 are respectively larger than the area of the electrode piece 3 to be tested.
[0041] like Figure 3 and Figure 4 As shown, the cross-sectional area of the injection hole 4 is smaller than the area of the electrode piece 3 to be tested, and smaller than the area of the circle surrounded by the maximum scale line of the circular scale line 6 .
[0042] The diameter of the injection hole 4 is 5-20 mm, and the thickness of the injection plate 2 is 4-20 mm.
[0043] like Figure 1As shown, a sealing ring 12 is embedded around the observation hole 7, and the wire diameter of the sealing ring 12 is 1.0-5.0 mm.
[0044] The thickness of the cover plate 5 is 8-20 mm, and the thickness of the sealing plate 8 is 4-20 mm.
[0045] In the present invention, the thickness and range of the bottom plate 1, the liquid injection plate 2, the cover plate 5 and the sealing plate 8 are reasonable adjustments that can be made by those skilled in the art based on their understanding of the concept of the device and in combination with actual needs, and do not constitute a limitation to the present invention.
[0046] like Figure 1 and Figure 4 As shown, the method for using the lithium-ion battery electrode piece infiltration test device of the utility model comprises the following steps: providing an electrode piece 3 to be tested and an electrolyte 13, placing the electrode piece 3 to be tested horizontally and centered on the upper surface of the bottom plate 1, pressing the injection plate 2 on the electrode piece 3 to be tested so that the side of the injection plate 2 provided with the circular scale line 6 corresponds to the electrode piece 3 to be tested, covering the upper surface of the injection plate 2 with a cover plate 5, injecting electrolyte into the injection hole 4 through the observation hole 7, covering the cover plate 5 on the upper part of the sealing plate 8 to isolate the electrolyte from the outside, observing the infiltration of the electrolyte 13 through the observation hole 7, and recording the value of the circular scale line 6 corresponding to the electrode piece 3 to be tested that is infiltrated by the electrolyte.
[0047] like Figure 5 As shown, with the increase of the infiltration time T (horizontal axis: 1h, 8h, 16h, 24h and 48h), the area of different pole pieces (sample A, sample B, sample C and sample D) infiltrated with the electrolyte gradually increases, and the scale value data can be directly read through the circular scale line 6 (vertical axis: 0mm, 10mm, 20mm, 30mm, 40mm, 50mm and 60mm). The scale value is the diameter read by direct observation, and the error is about 1mm. The data is collected and a curve graph is generated. Then, the wetting effect of the pole piece material on the electrolyte can be analyzed to verify the rate at which the pole piece material absorbs the electrolyte.
[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.
Claims
1. Lithium-ion battery electrode wetting test device, Features: include: A bottom plate, the upper surface of the bottom plate is connected to a liquid injection plate, a pole piece to be tested is placed between the bottom plate and the liquid injection plate, a liquid injection hole is arranged on the liquid injection plate, the upper surface of the liquid injection plate is connected to a cover plate, a scale line is arranged on the lower surface of the liquid injection plate, an observation hole is arranged in the cover plate, the upper surface of the cover plate is connected to a sealing plate, the bottom plate and the cover plate are connected by a positioning piece, and the liquid injection plate and the sealing plate are transparent parts respectively.
2. The lithium-ion battery pole piece wetting test device according to claim 1, Features: The bottom plate is provided with more than two first positioning holes, and the cover plate is provided with more than two second positioning holes, the positions of the first positioning holes correspond to the positions of the second positioning holes, and the positioning member connects the bottom plate and the cover plate through the first positioning holes and the second positioning holes, and limits the sealing plate.
3. The lithium-ion battery pole piece wetting test device as claimed in claim 2, Features: There are more than two positioning members, and the positioning members can be selected from bolts, positioning rods or positioning columns. The diameter of the positioning members is 2-20 mm.
4. The lithium-ion battery pole piece wetting test device as claimed in claim 3, Features: A circular scale line is arranged on the lower surface of the liquid injection plate with the liquid injection hole as the center, and scale values are marked on the circular scale line.
5. The lithium-ion battery pole piece wetting test device as claimed in claim 4, Features: The upper surface area of the bottom plate, the lower surface area of the liquid injection plate and the area of the observation hole are respectively larger than the area of the electrode to be tested.
6. The lithium-ion battery pole piece wetting test device as claimed in claim 5, Features: The cross-sectional area of the injection hole is smaller than the area of the electrode to be tested, and smaller than the area of the circle surrounded by the maximum scale line of the circular scale line.
7. The lithium-ion battery pole piece wetting test device according to claim 6, Features: The diameter of the injection hole is 5-20 mm, and the thickness of the injection plate is 4-20 mm.
8. The lithium-ion battery pole piece wetting test device according to claim 7, Features: A sealing ring is embedded around the observation hole, and the wire diameter of the sealing ring is 1.0-5.0 mm.
9. The lithium-ion battery pole piece wetting test device as claimed in claim 8, Features: The thickness of the cover plate is 8-20 mm.
10. The lithium-ion battery pole piece wetting test device according to claim 9, Features: The thickness of the sealing plate is 4-20 mm.