Battery material wettability testing device

Abstract

The utility model relates to the technical field of battery testing, in particular to a battery material wettability testing device. The device comprises a base, a liquid storage tank and a support, the liquid storage tank and the support are arranged on the base, the liquid storage tank is used for storing electrolyte, the support is provided with at least one set of clamps, the clamps are located above the liquid storage tank and can move up and down, each set of clamps is fixedly provided with a clamping plate, the clamping plates are used for clamping a sample to be detected, and the clamping plates are used for clamping the sample to be detected. The to-be-tested sample comprises at least one of a battery diaphragm and a battery pole piece, and the pressure applied to the to-be-tested sample by the clamping plate is adjustable. According to the technical scheme, the actual pressure environment of the to-be-tested material in the battery can be truly simulated.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a battery material wettability testing device. Background Technology

[0002] Lithium-ion batteries are a highly efficient and environmentally friendly rechargeable battery technology that has been favored for its superior performance since its introduction in 1990. With their high energy density, long cycle life, lack of memory effect, rapid charge and discharge capabilities, and environmentally friendly characteristics, lithium-ion batteries are playing an increasingly irreplaceable role in all aspects of people's lives.

[0003] The core components of a lithium-ion battery include the positive electrode material, the negative electrode material, the electrolyte, and the separator. The separator, as one of the most important components of a lithium-ion battery, plays a crucial role and is often referred to as the "third electrode." It isolates the cathode and anode to prevent short circuits, while allowing electrolyte ions to pass through. These ions are then transported within the electrolyte. Therefore, the quality of the separator's wettability with the electrolyte directly determines the efficiency of ion transport, thus affecting the battery's charge-discharge performance and capacity.

[0004] Measuring the wettability of electrolyte in a diaphragm quickly and accurately is an important method for characterizing diaphragm performance. Currently, commonly used methods are mainly divided into the dropping method and the creeping method. The dropping method involves using a microsyringe to draw electrolyte and drop it onto the diaphragm under test, comparing the diffusion area over the same time interval. This method can only provide qualitative comparisons and cannot provide quantitative ones. Alternatively, electrolyte can be dropped onto the diaphragm surface and the contact angle can be compared, but the wetting rate of the electrolyte on the diaphragm surface is very fast, making accurate measurement of the contact angle not very easy. Patent CN206541899U provides a device for testing the wettability of electrolyte in a separator, including an electrolyte tank and a vertical beam. A vertical track on the beam, combined with a lifting mechanism, causes the structure holding the sample to slide up and down, thus achieving the wettability test. Patent CN116519546A provides a device and method for detecting the capillary wettability of electrolyte, including an electrolyte tank, a sample to be wetted, and two clamping plates. It records the height of the electrolyte rising in the sample at different time intervals and finally calculates the wettability rate after the start of wettability. Both of these methods belong to the creeping method. Compared to the dripping method, they can quantitatively test the creeping rate. However, the separator absorbs liquid in a free-hanging state, which cannot simulate the pressure inside the battery.

[0005] Therefore, there is an urgent need to provide a battery material wettability testing device to effectively solve the above-mentioned technical problems. Utility Model Content

[0006] This invention provides a battery material wettability testing device that can realistically simulate the actual internal pressure environment of a battery.

[0007] This utility model provides a battery material wettability testing device, including a base and a liquid storage tank and a support disposed on the base. The liquid storage tank is used to store electrolyte. The support is provided with at least one set of clamps. The clamps are located above the liquid storage tank and can move up and down. Each set of clamps is fixed with a clamping plate. The clamping plate is used to hold the sample to be tested. The sample to be tested includes at least one of battery separator and battery electrode. The pressure applied by the clamping plate to the sample to be tested is adjustable.

[0008] This invention provides a battery material wettability testing device. It utilizes at least one set of clamps mounted on a support, positioned above a storage tank. The clamps are movable vertically, and each set of clamps has a fixed clamping plate that holds the sample to be tested. The pressure applied to the sample by the clamping plate is adjustable, thus simulating the wettability process of a battery under actual pressure conditions. Therefore, this technical solution can realistically simulate the actual internal pressure environment of a battery, which is of significant reference value for the wettability of the electrolyte on the separator and electrodes during actual electrolyte injection. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the battery material wettability testing device provided in this embodiment of the utility model.

[0011] Figure label:

[0012] 1-Base; 2-Liquid reservoir; 3-Bracket; 4-Clamp; 5-Clamping plate; 6-First fastening knob; 7-Second fastening knob; 31-Vertical beam; 32-Horizontal beam; 33-Spring. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0014] like Figure 1 As shown in the figure, this utility model embodiment provides a battery material wettability testing device. The device includes a base 1, a liquid storage tank 2 and a support 3 disposed on the base 1. The liquid storage tank 2 is used to store electrolyte. At least one set of clamps 4 is disposed on the support 3. The clamps 4 are located above the liquid storage tank 2 and can move up and down. Each set of clamps 4 is fixed with a clamping plate 5. The clamping plate 5 is used to clamp the sample to be tested (not shown in the figure). The sample to be tested includes at least one of battery separator and battery electrode. The pressure applied to the sample by the clamping plate 5 is adjustable.

[0015] In this embodiment, at least one set of clamps 4 is provided on the support 3, positioned above the liquid storage tank 2. The clamps 4 can move up and down, and the sample to be tested is held by clamping plates 5 fixed to each set of clamps 4. The pressure applied to the sample by the clamping plates 5 is adjustable, thus simulating the wetting process of the battery under actual pressure conditions. Therefore, the above technical solution can realistically simulate the actual internal pressure environment of the battery, which has important reference value for the wetting effect of the electrolyte on the separator and electrode during the actual liquid injection process.

[0016] In addition, the support 3 is equipped with multiple sets of clamps 4, which can realize repeatable measurement of the same sample and real-time comparison of different types of samples.

[0017] In one embodiment of this utility model, the liquid storage tank 2 can be any open-type vessel made of plastic, glass, ceramic or metal that does not react with the electrolyte.

[0018] In some embodiments, the liquid storage tank 2 is a rectangular transparent vessel, which allows for the measurement of multiple sets of samples and better observation of the wetting process.

[0019] In one embodiment of this utility model, the upper surface of the liquid storage tank 2 is provided with an opening (not shown in the figure). The opening is used to allow the clamping plate 5 and the sample to be tested to pass through. In this way, while ensuring the measurement conditions as much as possible, the evaporation of the electrolyte can be better prevented.

[0020] In one embodiment of the present invention, the bracket 3 includes a vertical beam 31 and a horizontal beam 32. The vertical beam 31 is fixed on the base 1, the horizontal beam 32 is perpendicular to and connected to the vertical beam 31, the clamp 4 is fixed on the horizontal beam 32, the clamping plate 5 is perpendicular to the horizontal beam 32, and the horizontal beam 32 can move up and down to drive the clamp 4 to move up and down.

[0021] In one embodiment of this utility model, the vertical beam 31 is provided with a spring 33 and a locking structure (not shown in the figure). When the vertical beam 31 is pressed, the spring 33 is compressed and the locking structure locks the current state of the spring 33. When the locking structure is unlocked, the spring 33 returns to the initial position to realize the up and down movement of the clamp 4.

[0022] In this embodiment, the clamp 4 can be easily moved up and down by setting the spring 33 and the locking structure. Using the spring 33 and the locking structure instead of a motor and slide rail system results in lower cost and simpler maintenance. That is, when the test is performed, pressing once compresses the spring 33, clamps the sample to be tested with the clamp 5, and the bottom end of the sample is just immersed in the electrolyte. When the test is finished, pressing again returns the spring 33 to its initial position, and the clamp 5 is pulled out of the electrolyte.

[0023] It should be noted that the specific structure and principle of the locking structure are well known to those skilled in the art, and will not be elaborated here.

[0024] In one embodiment of the present invention, the crossbeam 32 and the vertical beam 31 are connected by a first fastening knob 6, which is used to adjust the tightness of the crossbeam 32 and the vertical beam 31.

[0025] In this embodiment, the tightness of the crossbeam 32 and the vertical beam 31 can be easily adjusted by setting the first fastening knob 6.

[0026] In one embodiment of this invention, the number of layers of the sample to be tested can be adjusted according to the testing needs; for example, it can be one layer or multiple layers.

[0027] In one embodiment of this utility model, the clamp 5 is a glass clamp 5, and one side of the clamp 5 has a scale, so that the wetting height of the electrolyte can be accurately measured.

[0028] In some implementations, the smallest scale division can be 0.5 mm, which allows for more accurate measurement of the immersion height.

[0029] In one embodiment of the present invention, the above-mentioned device further includes an image recording component (not shown in the figure), which is used to record the process of electrolyte rising when the clamping plate 5 and the sample to be tested enter the storage tank 2.

[0030] In some implementations, the image recording component may include a camera.

[0031] In this embodiment, video analytics technology can be used to capture the immersion process with a camera, facilitating subsequent data analysis and processing.

[0032] In one embodiment of the present invention, the clamp 4 is provided with a second fastening knob 7, which is used to adjust the pressure applied to the sample to be tested.

[0033] In this embodiment, the pressure applied to the sample to be tested can be easily adjusted by setting the second fastening knob 7.

[0034] The testing method for the above-mentioned device is described in detail below:

[0035] S1. Inject the electrolyte into the storage tank 2;

[0036] S2. Cut the sample to be tested into a suitable size, place it between the two clamps 5, and fix it to the crossbeam 32 using the clamp 4.

[0037] S3. Turn on the camera recording function, press the vertical beam 31 down so that the bottom end of the clamp 5 is immersed in the electrolyte, and record the entire process of the electrolyte climbing.

[0038] S4. Analyze the video of the test process and record the time T0 when the sample is just immersed in the electrolyte and the time T1 when the immersion height reaches H1.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery material wettability testing device, comprising: The device includes a base (1), a liquid storage tank (2) and a support (3) disposed on the base (1). The liquid storage tank (2) is used to store electrolyte. The support (3) is provided with at least one set of clamps (4). The clamps (4) are located above the liquid storage tank (2) and can move up and down. Each set of clamps (4) is fixed with a clamping plate (5). The clamping plate (5) is used to clamp the sample to be tested. The sample to be tested includes at least one of battery separator and battery electrode. The pressure applied by the clamping plate (5) to the sample to be tested is adjustable.

2. The battery material wettability testing apparatus of claim 1, wherein, The storage tank (2) is an open-type vessel that does not react with the electrolyte.

3. The battery material wettability testing apparatus of claim 2, wherein, The upper surface of the liquid storage tank (2) is provided with an opening for the clamp (5) and the sample to be tested to pass through.

4. The battery material wettability testing apparatus of claim 1, wherein, The bracket (3) includes a vertical beam (31) and a horizontal beam (32). The vertical beam (31) is fixed on the base (1). The horizontal beam (32) is perpendicular to and connected to the vertical beam (31). The clamp (4) is fixed on the horizontal beam (32). The clamping plate (5) is perpendicular to the horizontal beam (32). The horizontal beam (32) can move up and down to drive the clamp (4) to move up and down.

5. The battery material wettability testing apparatus of claim 4, wherein, The vertical beam (31) is provided with a spring (33) and a locking structure. When the vertical beam (31) is pressed, the spring (33) is compressed, and the locking structure locks the current state of the spring (33). When the locking structure is released, the spring (33) returns to its initial position to enable the clamp (4) to move up and down.

6. The battery material wettability testing apparatus of claim 4, wherein, The crossbeam (32) and the vertical beam (31) are connected by a first fastening knob (6), which is used to adjust the tightness of the crossbeam (32) and the vertical beam (31).

7. The battery material wettability testing apparatus of claim 1, wherein, The sample to be tested has one or more layers.

8. The battery material wettability testing apparatus of claim 1, wherein, The clamp (5) is a glass clamp (5), and one side of the clamp (5) has a scale.

9. The battery material wettability testing apparatus of claim 1, wherein, It also includes an image recording component for recording the process of the electrolyte rising when the clamp (5) and the sample to be tested enter the storage tank (2).

10. The battery material wettability testing device of any one of claims 1-9, wherein, The clamp (4) is provided with a second fastening knob (7), which is used to adjust the pressure applied to the sample to be tested.

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