Battery separator performance testing apparatus

Abstract

The utility model provides battery diaphragm performance testing arrangement relates to the technical field of lithium ion battery material test, including by upper polar plate, lower polar plate and the baffle that is placed between and is equipped with the placement hole constitutes the closed chamber, is used for placing the diaphragm and electrolyte of waiting for measuring, including the heating plate and temperature sensor, the heating plate is contacted with the bottom surface of lower polar plate, and lower polar plate can pass on the heat of heating plate to closed chamber, the probe of temperature sensor is located in the detection hole that is equipped with on upper polar plate. Through testing in electrolyte environment, simulate the actual working condition of battery, make the test result more close to practical application scene, adopt by upper polar plate, lower polar plate and the baffle that is placed between and is equipped with the hole constitutes the closed chamber and the even heating design of heating plate, combine temperature sensor, realize the accurate control and measurement to electrolyte temperature, avoided the test error of traditional method because of temperature gradient.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium-ion battery material testing, and more specifically, to a battery separator performance testing device. Background Technology

[0002] The separator is a critical safety component of lithium-ion batteries, and its closure temperature and rupture temperature are core indicators for measuring battery thermal safety. Currently used testing methods, such as differential scanning calorimetry (DSC) and thermomechanical analysis (TMA), primarily focus on the thermodynamic properties of the material itself, making it difficult to simulate the electrochemical behavior of the separator in a real electrolyte environment. Furthermore, existing technologies suffer from inaccurate temperature control, asynchronous data acquisition, and significant differences between the testing environment and actual battery operating conditions, leading to insufficient reliability of test results. Utility Model Content

[0003] The present invention aims to solve the problems of unrealistic testing environment and imprecise temperature control in the prior art.

[0004] To address the above problems, this utility model provides a battery separator performance testing device, comprising: The test unit includes a partition plate with a placement hole in the center for placing the membrane to be tested and the electrolyte. A lower electrode plate is attached to the bottom surface of the partition plate, and an upper electrode plate is attached to the upper surface of the partition plate. The lower and upper electrode plates are used to block the two ends of the placement hole and to pass electricity to the electrolyte. A temperature control unit is used to heat and measure the temperature of the electrolyte in the placement hole. It includes a heating plate and a temperature sensor. The heating plate is in contact with the bottom surface of the lower electrode plate. The lower electrode plate can transfer the heat of the heating plate to the electrolyte. The probe of the temperature sensor is located in a detection hole opened on the upper electrode plate. The detection hole is connected to the placement hole. The measuring unit includes a resistance tester for measuring and recording the resistance data between the upper and lower plates in real time. The control unit is connected to the temperature control unit and the measurement unit to synchronously collect temperature and resistance data.

[0005] The battery separator performance testing device provided by this utility model has, but is not limited to, the following beneficial effects compared with the prior art: The design employs a uniform heating system consisting of an upper electrode plate, a lower electrode plate, and a separator with a placement hole, forming a sealed chamber. By testing in an electrolyte environment, the actual working state of the battery is simulated, making the test results closer to real-world application scenarios. The temperature sensor probe is placed inside the detection hole of the upper electrode plate, and the detection hole is directly connected to the placement hole. The probe does not contact the heating plate or the external environment, but directly contacts the electrolyte to measure the real-time temperature of the environment where the separator is located. This enables precise control and measurement of the electrolyte temperature, avoiding test errors caused by temperature gradients in traditional methods.

[0006] Furthermore, both the upper and lower electrode plates are made of copper and are plated with gold or platinum.

[0007] Furthermore, the partition is a ceramic insulating pad used to isolate the upper electrode plate and the lower electrode plate.

[0008] Furthermore, two terminals are fixedly connected to one side of the heating plate, which are connected to a power source to heat the heating plate.

[0009] Furthermore, sealing rings are provided between the upper electrode plate and the partition plate, and between the lower electrode plate and the partition plate.

[0010] Furthermore, it also includes a bracket, on which the heating plate is placed. A top rod is movably connected to the top of the bracket. A threaded hole is provided on the top of the bracket. The surface of the top rod is threaded. The bottom end of the top rod is screwed into the threaded hole until it abuts against the upper surface of the upper electrode plate.

[0011] Furthermore, there are several threaded holes, and each of the remaining threaded holes is screwed with a lead screw, the bottom end of which abuts against the four corners of the upper surface of the partition plate.

[0012] Furthermore, both the upper and lower electrode plates are provided with wiring holes for connecting the positive and negative terminals of the resistance tester, respectively.

[0013] Furthermore, the temperature sensor is a thermocouple or a resistance temperature sensor.

[0014] Furthermore, the probe of the temperature sensor is screwed and fixed to the detection hole. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Bracket; 2. Heating plate; 3. Lower electrode plate; 4. Upper electrode plate; 5. Partition plate; 6. Sealing ring; 7. Lead screw; 8. Top rod; 9. Terminal block; 10. Wiring hole; 11. Detection hole; 12. Placement hole. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0018] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0022] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0023] See Figure 1 and 2 The battery separator performance testing device of this utility model includes: The test unit includes a partition 5, with a placement hole 12 in the center of the partition 5 for placing the diaphragm to be tested and the electrolyte. A lower electrode plate 3 is attached to the bottom surface of the partition 5, and an upper electrode plate 4 is attached to the upper surface of the partition 5. The lower electrode plate 3 and the upper electrode plate 4 are used to block the two ends of the placement hole 12 and to pass electricity to the electrolyte. The temperature control unit is used to heat and measure the temperature of the electrolyte in the placement hole 12. It includes a heating plate 2 and a temperature sensor. The heating plate 2 is in contact with the bottom surface of the lower electrode plate 3. The lower electrode plate 3 can transfer the heat of the heating plate 2 to the electrolyte. The probe of the temperature sensor is located in the detection hole 11 opened on the upper electrode plate 4. The detection hole 11 is connected to the placement hole 12. The measuring unit includes a resistance tester for measuring and recording the resistance data between the upper plate 4 and the lower plate 3 in real time. The control unit is connected to the temperature control unit and the measurement unit to synchronously collect temperature and resistance data.

[0024] In this embodiment, the upper electrode plate 4, lower electrode plate 3, separator 5, and heating plate 2 are placed sequentially from top to bottom. Testing is conducted in an electrolyte environment to simulate the actual working state of the battery, making the test results closer to real-world application scenarios. A design is employed that uses the upper electrode plate 4, lower electrode plate 3, and separator 5 with placement holes 12 to form a sealed chamber, along with a uniform heating design for the heating plate 2. Combined with a temperature sensor, precise control and measurement of the electrolyte temperature are achieved, avoiding test errors caused by temperature gradients in traditional methods. The sealed chamber is formed when the two ends of the placement holes 12 on the separator 5 are sealed by the upper electrode plate 4 and lower electrode plate 3.

[0025] Optionally, both the upper electrode plate 4 and the lower electrode plate 3 are made of copper and their surfaces are plated with gold or platinum.

[0026] In this embodiment, copper's excellent conductivity reduces the inherent resistance of the electrode itself, minimizing the superimposed interference of electrode internal resistance on the diaphragm resistance measurement, thus making the measured value closer to the true resistance of the diaphragm. Gold / platinum plating prevents oxidation, corrosion, or chemical reactions between the electrode and the electrolyte; simultaneously, the smooth surface of the gold / platinum plating reduces the contact resistance between the electrode and the electrolyte, minimizing measurement errors caused by contact resistance fluctuations and ensuring the stability and accuracy of the resistance data.

[0027] Optionally, the partition 5 is a ceramic insulating pad used to isolate the upper electrode plate 4 and the lower electrode plate 3.

[0028] In this embodiment, the insulating effect of the ceramic insulating pad ensures that the upper and lower metal plates will not come into direct contact and cause a short circuit, thereby ensuring that the current must pass through the battery separator sample to be tested, making the resistance measurement accurate.

[0029] See Figure 2 Optionally, two terminals 9 are fixedly connected to one side of the heating plate 2, and the heating plate 2 is heated by connecting to a power source through the terminals 9.

[0030] In this embodiment, the terminal block is a standardized connection component, which is easier to connect and disassemble quickly than directly welding wires, reducing the difficulty of device assembly and maintenance.

[0031] See Figure 1 Optionally, a sealing ring 6 is provided between the upper electrode plate 4 and the partition plate 5, and between the lower electrode plate 3 and the partition plate 5.

[0032] In this embodiment, the sealing ring 6 is placed with the hole in the partition 5 as the center, filling the gap between the electrode plate and the partition 5 to prevent electrolyte leakage in the sealed chamber; at the same time, it prevents outside air and moisture from entering the chamber, preventing electrolyte oxidation and changes in the state of the diaphragm, and ensuring that the initial state of the electrolyte and the diaphragm is consistent throughout the test.

[0033] See Figure 2 Optionally, it also includes a bracket 1, on which the heating plate 2 is placed. A top rod 8 is movably connected to the top of the bracket 1. A threaded hole is provided on the top of the bracket 1. The surface of the top rod 8 is provided with threads. The bottom end of the top rod 8 is screwed into the threaded hole until it abuts against the upper surface of the upper electrode plate 4.

[0034] In this embodiment, the bracket 1 provides stable support for the entire test unit, preventing the device from tipping over or shifting during the test; the top rod 8 can precisely adjust the pressure through the threaded structure: tightening the top rod 8 downwards can make the upper electrode plate 4, the partition plate 5 and the lower electrode plate 3 fit tightly together, eliminating the gaps between the components.

[0035] Optionally, there are several threaded holes, and each of the remaining threaded holes is screwed with a lead screw 7, the bottom end of which abuts against the four corners of the upper surface of the partition plate 5.

[0036] In this embodiment, the lead screw 7 abuts against the four corners of the partition 5, which can prevent the partition 5 from tilting or shifting when heating or adjusting the top rod 8, ensuring that the upper electrode plate 4 and the lower electrode plate 3 are parallel. The fixing of the partition 5 can also prevent changes in the sealing gap between it and the electrode plate, and the auxiliary sealing ring 6 maintains the sealing performance to prevent electrolyte leakage or temperature loss.

[0037] See Figure 2 Optionally, both the upper electrode plate 4 and the lower electrode plate 3 are provided with wiring holes 10 for connecting the positive and negative terminals of the resistance tester, respectively.

[0038] In this embodiment, the wiring hole 10 is a dedicated connection structure.

[0039] Optionally, the temperature sensor is a thermocouple or a resistance temperature sensor.

[0040] In this embodiment, a high-precision temperature measuring element adapted to the test scenario is selected to ensure the accuracy of temperature measurement.

[0041] Optionally, the probe of the temperature sensor is screwed and fixed to the detection hole 11.

[0042] In this embodiment, the probe of the temperature sensor is inserted into the placement hole 12 through the detection hole 11 to directly contact the electrolyte for temperature measurement. At the same time, the screw can plug the detection hole 11 to maintain the airtightness of the sealed chamber.

[0043] Although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A battery separator performance testing device, characterized in that, include: The test unit includes a partition (5), with a placement hole (12) in the center of the partition (5) for placing the membrane to be tested and the electrolyte. A lower electrode plate (3) is attached to the bottom surface of the partition (5), and an upper electrode plate (4) is attached to the upper surface of the partition (5). The lower electrode plate (3) and the upper electrode plate (4) are used to block the two ends of the placement hole (12) and to pass electricity to the electrolyte. The temperature control unit is used to heat and measure the temperature of the electrolyte in the placement hole (12), including a heating plate (2) and a temperature sensor. The heating plate (2) is in contact with the bottom surface of the lower electrode plate (3). The lower electrode plate (3) can transfer the heat of the heating plate (2) to the electrolyte. The probe of the temperature sensor is located in the detection hole (11) opened on the upper electrode plate (4). The detection hole (11) is connected to the placement hole (12). The measuring unit includes a resistance tester for measuring and recording the resistance data between the upper plate (4) and the lower plate (3) in real time; The control unit is connected to the temperature control unit and the measurement unit to synchronously collect temperature and resistance data.

2. The battery separator performance testing device according to claim 1, characterized in that, Both the upper electrode plate (4) and the lower electrode plate (3) are made of copper and are plated with gold or platinum.

3. The battery separator performance testing device according to claim 1, characterized in that, The partition (5) is a ceramic insulating pad used to isolate the upper electrode plate (4) and the lower electrode plate (3).

4. The battery separator performance testing device according to claim 1, characterized in that, Two terminals (9) are fixedly connected to one side of the heating plate (2), and the heating plate (2) is heated by connecting to a power source through the terminals (9).

5. The battery separator performance testing device according to claim 1, characterized in that, A sealing ring (6) is provided between the upper electrode plate (4) and the partition plate (5) and between the lower electrode plate (3) and the partition plate (5).

6. The battery separator performance testing device according to claim 1, characterized in that, It also includes a bracket (1), the heating plate (2) is placed on the bracket (1), the top of the bracket (1) is movably connected to a top rod (8), the top of the bracket (1) is provided with a threaded hole, the surface of the top rod (8) is provided with a thread, and the bottom end of the top rod (8) is screwed into the threaded hole until it abuts against the upper surface of the upper electrode plate (4).

7. The battery separator performance testing device according to claim 6, characterized in that, The number of threaded holes is several, and each of the remaining threaded holes is screwed with a lead screw (7). The bottom end of the lead screw (7) abuts against the four corners of the upper surface of the partition plate (5).

8. The battery separator performance testing device according to claim 1, characterized in that, Both the upper electrode plate (4) and the lower electrode plate (3) are provided with wiring holes (10) for connecting the positive and negative terminals of the resistance tester, respectively.

9. The battery separator performance testing device according to claim 1, characterized in that, The temperature sensor is a thermocouple or a resistance temperature sensor.

10. The battery separator performance testing device according to claim 1, characterized in that, The probe of the temperature sensor is screwed and fixed to the detection hole (11).

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