Comprehensive test method for performance of battery sealant, battery sealant and battery

Abstract

The invention provides a comprehensive test method for the performance of a battery sealant, the battery sealant and a battery. The comprehensive test method comprises the following steps: testing the performance of the battery sealant, and testing the performance of the battery prepared from the battery sealant; the performance test of the battery prepared from the battery sealant comprises battery high-temperature resistance test, battery high-temperature and high-humidity resistance test and battery cold and hot impact resistance test. According to the comprehensive test method, not only is the performance of the battery sealant tested, but also the performance of the battery prepared from the battery sealant is tested, the performance of the sealant under various conditions can be comprehensively and accurately evaluated, and it is ensured that the sealant meets the safety and stability requirements of the battery; in addition, the comprehensive test method also has the advantages of being simple and convenient to operate, accurate in test and reliable in result, and can provide powerful technical support and decision basis for battery manufacturers.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries and relates to a comprehensive test method for battery sealant performance, in particular to a comprehensive test method for battery sealant performance, battery sealant and a battery. Background Art

[0002] As a key material in the battery manufacturing process, the performance of sealant directly affects the battery's waterproof, dustproof, shockproof and overall structural strength of the battery pack. Battery sealants are usually made of materials with high chemical stability (such as silicone, epoxy resin, etc.). These materials fill the gaps between battery components and form a solid barrier after curing, physically isolating the direct contact between the inside of the battery and the external environment. This barrier can effectively prevent the leakage of electrolyte, and also prevent external dust, moisture, etc. from invading the battery.

[0003] As battery application scenarios continue to expand, the application environment of batteries will face huge challenges. Special scenarios such as high temperature and high humidity have extremely high requirements for battery safety and performance. Battery sealants play a vital role in batteries. They can ensure the safety and stability of batteries, improve the high temperature resistance of batteries, and extend the service life of batteries. Therefore, it is of great significance to establish a systematic battery sealant evaluation method.

[0004] However, the battery sealant test methods disclosed in the prior art have a long evaluation cycle, high cost and complex procedures, and the failure mechanism after battery leakage is unclear, making it impossible to determine the cause of leakage. Most importantly, the existing evaluation methods often focus on testing a single performance indicator, lack comprehensiveness and systematicness, and are difficult to meet practical application requirements.

[0005] CN115074076A discloses a high-temperature sealant for a fuel cell humidifier, which belongs to the technical field of sealants and includes the following components by mass: 80-100 parts of terminal alkoxy polydimethylsiloxane, 2-20 parts of vinyl trimethoxy, 15-30 parts of filler, 1-2 parts of adhesion promoter and 2-6 parts of crosslinking agent. In this document, the tensile strength, elongation at break and hardness of the high-temperature sealant for a fuel cell humidifier are tested under normal conditions, double 85 aging ((85℃ / 85RH%) 1000H), high temperature aging (150℃ (500H)), and cold and hot shock (45℃~135℃ (1000H)). The Shore hardness, 24H deep curing thickness, surface drying time and viscosity of the high-temperature sealant for a fuel cell humidifier are also tested.

[0006] CN101250391A discloses a single-component high-temperature resistant silicone sealant, the formula ratio of which is (by weight): 90-110 parts of hydroxyl-terminated polysiloxane, 1-20 parts of fumed silica SiO2, 20-100 parts of high-temperature resistant filler, 1-10 parts of chain extender, 3-15 parts of cross-linking agent, 0.05-1 part of catalyst, and 0.5-6 parts of coupling agent. The document tests the heat resistance and low temperature resistance of the component high-temperature resistant silicone sealant.

[0007] The battery sealant performance test methods disclosed in the prior art have certain defects. They often focus on the test of a single performance indicator, lack the comprehensiveness and systematicness of sealant performance testing, and are difficult to meet the actual application requirements. It is difficult to screen out the corresponding battery sealant according to different actual application requirements. Therefore, it is very important to develop and design a new comprehensive test method for battery sealant performance, battery sealant and battery. Summary of the invention

[0008] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a comprehensive test method for battery sealant performance, a battery sealant and a battery. The comprehensive test method provided in the present invention not only tests the performance of the battery sealant itself, but also tests the performance of the battery prepared with the battery sealant. The performance tests of the battery prepared with the battery sealant include battery high temperature resistance performance tests, battery high temperature and high humidity resistance performance tests and battery cold and hot shock resistance performance tests. The performance of the sealant under various conditions can be comprehensively and accurately evaluated to ensure that it meets the safety and stability requirements of the battery, and a comprehensive and systematic test of the performance of the battery sealant is achieved. The comprehensive test method can screen out corresponding battery sealants according to different actual application requirements, thereby meeting the actual application requirements. In addition, the comprehensive test method also has the advantages of simple operation, accurate testing and reliable results, and can provide strong technical support and decision-making basis for battery manufacturers.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a comprehensive test method for battery sealant performance, the comprehensive test method comprising: testing the performance of the battery sealant itself, and testing the performance of a battery prepared with the battery sealant;

[0011] The performance tests of the battery prepared with the battery sealant include: battery high temperature resistance test, battery high temperature and high humidity resistance test and battery cold and heat shock resistance test.

[0012] The comprehensive testing method provided in the present invention not only tests the performance of the battery sealant itself, but also tests the performance of the battery prepared with the battery sealant. The performance tests of the battery prepared with the battery sealant include battery high temperature resistance performance test, battery high temperature and high humidity resistance performance test and battery cold and heat shock resistance performance test. It can comprehensively and accurately evaluate the performance of the sealant under various conditions to ensure that it meets the safety and stability requirements of the battery, and realizes comprehensive and systematic testing of the performance of the battery sealant. The comprehensive testing method can screen out corresponding battery sealants according to different actual application requirements, thereby meeting the actual application requirements; in addition, the comprehensive testing method also has the advantages of simple operation, accurate testing and reliable results, and can provide strong technical support and decision-making basis for battery manufacturers.

[0013] Preferably, the performance tests of the battery sealant itself include: sealant high temperature resistance test, sealant high temperature and high humidity resistance test, sealant low temperature resistance test, sealant hot and cold shock resistance test, sealant electrolyte resistance test and sealant usage performance test.

[0014] Preferably, the sealant high temperature resistance test includes:

[0015] The battery sealant was stored at 80-120°C for 800-1200 hours. The sealant was observed every 150-250 hours for color change, cracks, bubbles, shrinkage, deformation, and molten glue outflow. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the high temperature resistance of the battery sealant.

[0016] In the high temperature resistance test of the sealant of the present invention, the battery sealant is stored at 80-120°C, for example, it can be 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C or 120°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0017] In the high temperature resistance test of the sealant described in the present invention, the battery sealant is stored for 800 to 1200 hours, for example, it can be 800 hours, 850 hours, 900 hours, 950 hours, 1000 hours, 1050 hours, 1100 hours, 1150 hours or 1200 hours, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] In the high temperature resistance test of the sealant of the present invention, the sealant is observed every 150 to 250 hours to see whether there is any color change, cracks and bubbles, shrinkage deformation, or molten glue outflow. For example, it can be 150 hours, 160 hours, 170 hours, 180 hours, 190 hours, 200 hours, 210 hours, 220 hours, 230 hours, 240 hours or 250 hours. However, it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0019] Preferably, the sealant high temperature and high humidity resistance test includes:

[0020] The battery sealant is stored in an environment with a temperature of 40-80°C and a humidity of 80-95% for 800-1200 hours. The battery sealant is observed every 150-250 hours to see if there is any color change, cracks and bubbles, or shrinkage and deformation. The weight of the battery sealant is recorded to calculate the weight loss rate and evaluate the high temperature and high humidity resistance of the battery sealant.

[0021] In the high temperature and high humidity resistance test of the sealant of the present invention, the battery sealant is placed in an environment with a temperature of 40 to 80°C, for example, it can be 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C or 80°C, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] In the high temperature and high humidity resistance test of the sealant of the present invention, the battery sealant is placed in an environment with a humidity of 80-95%, for example, it can be 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94% or 95%, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0023] In the high temperature and high humidity resistance test of the sealant of the present invention, the battery sealant is stored for 800 to 1200 hours, for example, it can be 800 hours, 850 hours, 900 hours, 950 hours, 1000 hours, 1050 hours, 1100 hours, 1150 hours or 1200 hours, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] In the high temperature and high humidity resistance test of the sealant of the present invention, the battery sealant is observed every 150 to 250 hours to see whether there is any color change, cracks and bubbles, or shrinkage and deformation. For example, it can be 150 hours, 160 hours, 170 hours, 180 hours, 190 hours, 200 hours, 210 hours, 220 hours, 230 hours, 240 hours or 250 hours, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0025] Preferably, the sealant low temperature resistance test includes:

[0026] The battery sealant was stored in an environment of -50 to -30°C for 800 to 1200 hours. The battery sealant was observed every 150 to 250 hours for cracking and shrinkage. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the low temperature resistance of the battery sealant.

[0027] In the low temperature resistance test of the sealant of the present invention, the battery sealant is placed in an environment with a temperature of -50 to -30°C, for example, it can be -50°C, -48°C, -45°C, -42°C, -40°C, -38°C, -35°C, -32°C or -30°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0028] In the low temperature resistance test of the sealant of the present invention, the battery sealant is stored for 800 to 1200 hours, for example, it can be 800 hours, 850 hours, 900 hours, 950 hours, 1000 hours, 1050 hours, 1100 hours, 1150 hours or 1200 hours, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0029] In the low temperature resistance test of the sealant of the present invention, the battery sealant is observed for cracking and shrinkage every 150 to 250 hours, and the weight of the battery sealant is recorded to calculate the weight loss rate. For example, it can be 150 hours, 160 hours, 170 hours, 180 hours, 190 hours, 200 hours, 210 hours, 220 hours, 230 hours, 240 hours or 250 hours, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0030] Preferably, the sealant thermal shock resistance test includes:

[0031] The battery sealant was stored in a hot and cold shock box at -50 to -30°C and 100 to 140°C for 800 to 1200 hours, with hot and cold exchange performed every 20 to 40 minutes. The battery sealant was observed every 150 to 250 hours for any color changes, cracks, bubbles, shrinkage or deformation. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the hot and cold shock resistance of the battery sealant.

[0032] In the test of the heat shock resistance of the sealant of the present invention, the battery sealant is placed in a heat shock box at -50 to -30°C and 100 to 140°C, the cold zone temperature in the heat shock box is -50 to -30°C, for example, it can be -50°C, -48°C, -45°C, -42°C, -40°C, -38°C, -35°C, -32°C or -30°C, but it is not limited to the listed values, and other values ​​not listed within the numerical range are equally applicable; the hot zone temperature in the heat shock box is 100 to 140°C, for example, it can be 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C or 140°C, but it is not limited to the listed values, and other values ​​not listed within the numerical range are equally applicable.

[0033] In the test of the heat shock resistance of the sealant of the present invention, the sealant is stored in a heat shock box for 800 to 1200 hours, for example, it can be 800 hours, 850 hours, 900 hours, 950 hours, 1000 hours, 1050 hours, 1100 hours, 1150 hours or 1200 hours, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0034] In the test of the heat shock resistance of the sealant of the present invention, heat exchange is carried out every 20 to 40 minutes, for example, 20 minutes, 22 minutes, 25 minutes, 28 minutes, 30 minutes, 32 minutes, 35 minutes, 38 minutes or 40 minutes, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0035] In the cold and hot shock resistance test of the sealant of the present invention, the battery sealant is observed every 150 to 250 hours to see whether there is any color change, cracks and bubbles, or shrinkage and deformation, and the weight of the battery sealant is recorded to calculate the weight loss rate. For example, it can be 150h, 160h, 170h, 180h, 190h, 200h, 210h, 220h, 230h, 240h or 250h, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0036] Preferably, the sealant electrolyte resistance test includes:

[0037] The battery sealant is immersed in the battery electrolyte and stored in a set temperature environment for 20 to 40 days. Every 4 to 8 days, the battery sealant is observed to see if any chemical reaction such as swelling, dissolution or discoloration occurs, and the electrolyte resistance of the battery sealant is evaluated.

[0038] The set temperature in the present invention is determined according to the working temperature of the electrolyte in actual application.

[0039] In the electrolyte resistance performance test of the sealant of the present invention, the battery sealant is immersed in a battery electrolyte and stored in an environment of set temperature for 20 to 40 days, for example, 20 days, 22 days, 25 days, 28 days, 30 days, 32 days, 35 days, 38 days or 40 days, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0040] In the electrolyte resistance performance test of the sealant of the present invention, the battery sealant is observed every 4 to 8 days to see whether swelling, dissolution or discoloration chemical reactions occur. For example, it can be 4 days, 5 days, 6 days, 7 days or 8 days, but it is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0041] Preferably, the sealant performance test includes:

[0042] Use a glass rod to dip a small amount of battery sealant and then drip it to observe whether there is any drawing. Use a glue coating machine to apply a circle of battery sealant on the inner wall or R corner of the battery steel shell, and observe whether there is any breakage or spillage during the gluing process. After curing, observe whether there are bubbles and escape in the battery sealant to evaluate the performance of the battery sealant.

[0043] Preferably, the performance test of the battery sealant itself also includes an initial appearance test, a solid content test, an insulation test and a viscosity test.

[0044] The method of the initial appearance test in the present invention includes visual inspection.

[0045] The solid content testing method described in the present invention includes GB / T 2793-1995.

[0046] The insulation test method described in the present invention includes the test of volume resistivity, and the test method includes GB / T5654-1985.

[0047] The viscosity test method described in the present invention includes GB / T 2794-2022.

[0048] Preferably, the battery high temperature resistance test includes:

[0049] The battery is stored at 80-120°C for 800-1200 hours, and whether leakage occurs is determined based on the battery weight loss rate and appearance every 150-250 hours. The internal resistance, voltage and load voltage of the battery are also tested, and whether the battery performance is abnormal is determined based on the internal resistance, voltage and load voltage data.

[0050] In the high temperature resistance test of the battery of the present invention, the battery is stored at 80-120°C, for example, it can be 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C or 120°C, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0051] In the high temperature resistance performance test of the battery described in the present invention, the battery is stored for 800 to 1200 hours, for example, it can be 800 hours, 850 hours, 900 hours, 950 hours, 1000 hours, 1050 hours, 1100 hours, 1150 hours or 1200 hours, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0052] In the high temperature resistance performance test of the battery of the present invention, whether leakage occurs is determined based on the battery weight loss rate and appearance every 150 to 250 hours, and the internal resistance, voltage and load voltage of the battery are detected. For example, it can be 150 hours, 160 hours, 170 hours, 180 hours, 190 hours, 200 hours, 210 hours, 220 hours, 230 hours, 240 hours or 250 hours, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0053] Preferably, the battery high temperature and high humidity resistance test includes:

[0054] The battery is placed in an environment with a temperature of 40-80°C and a humidity of 80-95% and stored for 800-1200 hours. Whether leakage occurs is determined every 150-250 hours based on the battery weight loss rate and appearance. The internal resistance, voltage and load voltage of the battery are also detected. Whether the battery performance is abnormal is determined based on the data of the internal resistance, voltage and load voltage.

[0055] In the high temperature and high humidity performance test of the battery of the present invention, the battery is stored in an environment with a temperature of 40-80°C, for example, it can be 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C or 80°C, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0056] In the high temperature and high humidity resistance test of the battery of the present invention, the battery is placed in an environment with a humidity of 80-95%, for example, it can be 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94% or 95%, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0057] In the high temperature and high humidity resistance test of the battery of the present invention, the battery is stored for 800 to 1200 hours, for example, it can be 800 hours, 850 hours, 900 hours, 950 hours, 1000 hours, 1050 hours, 1100 hours, 1150 hours or 1200 hours, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0058] In the high temperature and high humidity resistance test of the battery of the present invention, whether leakage occurs is determined based on the battery weight loss rate and appearance every 150 to 250 hours, and the internal resistance, voltage and load voltage of the battery are detected. For example, it can be 150 hours, 160 hours, 170 hours, 180 hours, 190 hours, 200 hours, 210 hours, 220 hours, 230 hours, 240 hours or 250 hours, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0059] Preferably, the battery thermal shock resistance test includes:

[0060] The battery is placed in a hot / cold shock box at -50 to -30°C and 100 to 140°C for 800 to 1200 hours, with hot / cold exchange performed every 20 to 40 minutes. Whether leakage occurs is determined every 150 to 250 hours based on the battery weight loss rate and appearance, and the open circuit internal resistance, voltage and load voltage of the battery are tested. Whether the battery performance is abnormal is determined based on the internal resistance, voltage and load voltage data.

[0061] In the test of the thermal shock resistance of the battery of the present invention, the battery is placed in a thermal shock box at -50 to -30°C and 100 to 140°C, the cold zone temperature in the thermal shock box is -50 to -30°C, for example, it can be -50°C, -48°C, -45°C, -42°C, -40°C, -38°C, -35°C, -32°C or -30°C, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable; the hot zone temperature in the thermal shock box is 100 to 140°C, for example, it can be 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C or 140°C, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0062] In the thermal shock resistance test of the battery of the present invention, the battery is placed in a thermal shock box and stored for 800 to 1200 hours, for example, 800 hours, 850 hours, 900 hours, 950 hours, 1000 hours, 1050 hours, 1100 hours, 1150 hours or 1200 hours, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0063] In the thermal shock resistance test of the battery of the present invention, thermal exchange is performed every 20 to 40 minutes, for example, 20 minutes, 22 minutes, 25 minutes, 28 minutes, 30 minutes, 32 minutes, 35 minutes, 38 minutes or 40 minutes, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0064] In the cold and heat shock resistance test of the battery of the present invention, whether leakage occurs is determined based on the battery weight loss rate and appearance every 150 to 250 hours, and the open circuit internal resistance, voltage and load voltage of the battery are detected. For example, it can be 150 hours, 160 hours, 170 hours, 180 hours, 190 hours, 200 hours, 210 hours, 220 hours, 230 hours, 240 hours or 250 hours, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0065] In a second aspect, the present invention provides a battery sealant, which is obtained by screening through the comprehensive testing method described in the first aspect.

[0066] In a third aspect, the present invention provides a battery, comprising the battery sealant described in the second aspect.

[0067] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0068] Compared with the prior art, the present invention has the following beneficial effects:

[0069] The comprehensive testing method provided in the present invention not only tests the performance of the battery sealant itself, but also tests the performance of the battery prepared with the battery sealant. The performance tests of the battery prepared with the battery sealant include battery high temperature resistance performance test, battery high temperature and high humidity resistance performance test and battery cold and heat shock resistance performance test. It can comprehensively and accurately evaluate the performance of the sealant under various conditions to ensure that it meets the safety and stability requirements of the battery, and realizes comprehensive and systematic testing of the performance of the battery sealant. The comprehensive testing method can screen out corresponding battery sealants according to different actual application requirements, thereby meeting the actual application requirements; in addition, the comprehensive testing method also has the advantages of simple operation, accurate testing and reliable results, and can provide strong technical support and decision-making basis for battery manufacturers. DETAILED DESCRIPTION

[0070] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0071] Example 1

[0072] This embodiment provides a comprehensive test method for battery sealant performance, the comprehensive test method comprising: testing the performance of the battery sealant itself, and testing the performance of a battery prepared with the battery sealant;

[0073] The performance tests of the battery sealant itself include: sealant high temperature resistance test, sealant high temperature and high humidity resistance test, sealant low temperature resistance test, sealant cold and hot shock resistance test, sealant electrolyte resistance test and sealant use performance test, as well as initial appearance test, solid content test, insulation test and viscosity test;

[0074] The sealant high temperature resistance test includes:

[0075] The battery sealant was stored at 100°C for 1000 hours, and the sealant was observed every 200 hours to see if there was any color change, cracks and bubbles, shrinkage deformation, or melt outflow. The weight of the battery sealant was recorded to calculate the weight loss rate, and the high temperature resistance of the battery sealant was evaluated.

[0076] The sealant high temperature and high humidity resistance test includes:

[0077] The battery sealant was placed in an environment with a temperature of 60°C and a humidity of 90% and stored for 1000 hours. Every 200 hours, the battery sealant was observed for color changes, cracks, bubbles, shrinkage and deformation. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the high temperature and high humidity resistance of the battery sealant.

[0078] The sealant low temperature resistance test includes:

[0079] The battery sealant was stored in an environment with a temperature of -40°C for 1000 hours. Every 200 hours, the battery sealant was observed for cracking and shrinkage. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the low temperature resistance of the battery sealant.

[0080] The sealant thermal shock resistance test includes:

[0081] The battery sealant was placed in a hot and cold shock chamber at -40°C and 120°C for 1000 hours, with hot and cold exchanges performed every 30 minutes. The battery sealant was observed every 200 hours to see if there were any color changes, cracks, bubbles, or shrinkage deformation. The weight of the battery sealant was recorded to calculate the weight loss rate, and the hot and cold shock resistance of the battery sealant was evaluated.

[0082] The sealant electrolyte resistance performance test includes:

[0083] The battery sealant was immersed in the battery electrolyte and stored in a set temperature environment for 30 days. Every 6 days, the battery sealant was observed to see if it swelled, dissolved, or changed color. The electrolyte resistance of the battery sealant was evaluated.

[0084] The sealant performance test includes:

[0085] Use a glass rod to dip a small amount of battery sealant and then drip it to observe whether there is any drawing; use a glue coating machine to apply a circle of battery sealant on the inner wall or R corner of the battery steel shell, observe whether there is any glue breakage or glue spillage during the gluing process, and observe whether there are bubbles and escape in the battery sealant after curing, and evaluate the performance of the battery sealant;

[0086] The method of the initial appearance test includes visual inspection;

[0087] The solid content test method includes GB / T 2793-1995;

[0088] The insulation test method includes a volume resistivity test, and the test method includes GB / T5654-1985;

[0089] The viscosity test method includes GB / T 2794-2022;

[0090] The performance tests of the battery prepared with the battery sealant include: battery high temperature resistance test, battery high temperature and high humidity resistance test and battery cold and heat shock resistance test;

[0091] The battery high temperature resistance performance test includes:

[0092] The battery is stored at 100° C. for 1000 hours, and whether leakage occurs is determined based on the battery weight loss rate and appearance every 200 hours, and the internal resistance, voltage, and load voltage of the battery are detected, and whether the battery performance is abnormal is determined based on the data of the internal resistance, voltage, and load voltage;

[0093] The battery high temperature and high humidity resistance performance test includes:

[0094] The battery is stored in an environment with a temperature of 60°C and a humidity of 90% for 1000 hours. Whether leakage occurs is determined every 200 hours based on the battery weight loss rate and appearance. The internal resistance, voltage and load voltage of the battery are also detected. Whether the battery performance is abnormal is determined based on the internal resistance, voltage and load voltage data.

[0095] The battery thermal shock resistance test includes:

[0096] The battery is placed in a hot and cold shock box at -40°C and 120°C for 1000 hours, with hot and cold exchange performed every 30 minutes. Every 200 hours, whether leakage occurs is determined based on the battery weight loss rate and appearance, and the open circuit internal resistance, voltage and load voltage of the battery are tested. Whether the battery performance is abnormal is determined based on the internal resistance, voltage and load voltage data.

[0097] Example 2

[0098] This embodiment provides a comprehensive test method for battery sealant performance, the comprehensive test method comprising: testing the performance of the battery sealant itself, and testing the performance of a battery prepared with the battery sealant;

[0099] The performance tests of the battery sealant itself include: sealant high temperature resistance test, sealant high temperature and high humidity resistance test, sealant low temperature resistance test, sealant cold and hot shock resistance test, sealant electrolyte resistance test and sealant use performance test, as well as initial appearance test, solid content test, insulation test and viscosity test;

[0100] The sealant high temperature resistance test includes:

[0101] The battery sealant was stored at 80°C for 1200 hours, and the sealant was observed every 250 hours to see if there was any color change, cracks and bubbles, shrinkage deformation, or melt outflow. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the high temperature resistance of the battery sealant.

[0102] The sealant high temperature and high humidity resistance test includes:

[0103] The battery sealant was placed in an environment with a temperature of 40°C and a humidity of 95% and stored for 800 hours. Every 150 hours, the battery sealant was observed for color changes, cracks, bubbles, shrinkage and deformation. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the high temperature and humidity resistance of the battery sealant.

[0104] The sealant low temperature resistance test includes:

[0105] The battery sealant was stored in an environment with a temperature of -50°C for 800 hours. Every 150 hours, the battery sealant was observed for cracking and shrinkage. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the low temperature resistance of the battery sealant.

[0106] The sealant thermal shock resistance test includes:

[0107] The battery sealant was placed in a hot and cold shock chamber at -50°C and 100°C for 1200 hours, with hot and cold exchanges performed every 40 minutes. The battery sealant was observed every 250 hours to see if there were any color changes, cracks, bubbles, or shrinkage deformation. The weight of the battery sealant was recorded to calculate the weight loss rate, and the hot and cold shock resistance of the battery sealant was evaluated.

[0108] The sealant electrolyte resistance performance test includes:

[0109] The battery sealant was immersed in the battery electrolyte and stored in a set temperature environment for 40 days. Every 8 days, the battery sealant was observed to see if it swelled, dissolved, or changed color. The electrolyte resistance of the battery sealant was evaluated.

[0110] The sealant performance test includes:

[0111] Use a glass rod to dip a small amount of battery sealant and then drip it to observe whether there is any drawing; use a glue coating machine to apply a circle of battery sealant on the inner wall or R corner of the battery steel shell, observe whether there is any glue breakage or glue spillage during the gluing process, and observe whether there are bubbles and escape in the battery sealant after curing, and evaluate the performance of the battery sealant;

[0112] The method of the initial appearance test includes visual inspection;

[0113] The solid content test method includes GB / T 2793-1995;

[0114] The insulation test method includes a volume resistivity test, and the test method includes GB / T5654-1985;

[0115] The viscosity test method includes GB / T 2794-2022;

[0116] The performance tests of the battery prepared with the battery sealant include: battery high temperature resistance test, battery high temperature and high humidity resistance test and battery cold and heat shock resistance test;

[0117] The battery high temperature resistance performance test includes:

[0118] The battery is stored at 80° C. for 1200 hours, and whether leakage occurs is determined based on the battery weight loss rate and appearance every 250 hours, and the internal resistance, voltage, and load voltage of the battery are detected, and whether the battery performance is abnormal is determined based on the data of the internal resistance, voltage, and load voltage;

[0119] The battery high temperature and high humidity resistance performance test includes:

[0120] The battery is stored in an environment with a temperature of 40°C and a humidity of 95% for 800 hours. The battery weight loss rate and appearance are used to determine whether leakage occurs every 150 hours. The internal resistance, voltage and load voltage of the battery are also detected. The battery performance is determined to be abnormal based on the internal resistance, voltage and load voltage data.

[0121] The battery thermal shock resistance test includes:

[0122] The battery is placed in a hot and cold shock box at -50°C and 100°C for 800 hours, with hot and cold exchange performed every 20 minutes. Every 250 hours, whether leakage occurs is determined based on the battery weight loss rate and appearance, and the open circuit internal resistance, voltage and load voltage of the battery are tested. Whether the battery performance is abnormal is determined based on the internal resistance, voltage and load voltage data.

[0123] Example 3

[0124] This embodiment provides a comprehensive test method for battery sealant performance, the comprehensive test method comprising: testing the performance of the battery sealant itself, and testing the performance of a battery prepared with the battery sealant;

[0125] The performance tests of the battery sealant itself include: sealant high temperature resistance test, sealant high temperature and high humidity resistance test, sealant low temperature resistance test, sealant cold and hot shock resistance test, sealant electrolyte resistance test and sealant use performance test, as well as initial appearance test, solid content test, insulation test and viscosity test;

[0126] The sealant high temperature resistance test includes:

[0127] The battery sealant was stored at 120°C for 800 hours, and the sealant was observed every 150 hours to see if there was any color change, cracks and bubbles, shrinkage deformation, or melt outflow. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the high temperature resistance of the battery sealant.

[0128] The sealant high temperature and high humidity resistance test includes:

[0129] The battery sealant was placed in an environment with a temperature of 80°C and a humidity of 80% and stored for 1200 hours. Every 250 hours, the battery sealant was observed for color changes, cracks, bubbles, shrinkage and deformation. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the high temperature and humidity resistance of the battery sealant.

[0130] The sealant low temperature resistance test includes:

[0131] The battery sealant was stored in an environment with a temperature of -30°C for 1200 hours. Every 250 hours, the battery sealant was observed for cracking and shrinkage. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the low temperature resistance of the battery sealant.

[0132] The sealant thermal shock resistance test includes:

[0133] The battery sealant was placed in a -30℃ and 140℃ hot and cold shock chamber for 800h, with hot and cold exchange performed every 20min. The battery sealant was observed every 150h to see if there was any color change, cracks, bubbles, or shrinkage deformation. The weight of the battery sealant was recorded to calculate the weight loss rate, and the hot and cold shock resistance of the battery sealant was evaluated.

[0134] The sealant electrolyte resistance performance test includes:

[0135] The battery sealant was immersed in the battery electrolyte and stored in a set temperature environment for 20 days. Every 4 days, the battery sealant was observed to see if it swelled, dissolved, or changed color. The electrolyte resistance of the battery sealant was evaluated.

[0136] The sealant performance test includes:

[0137] Use a glass rod to dip a small amount of battery sealant and then drip it to observe whether there is any drawing; use a glue coating machine to apply a circle of battery sealant on the inner wall or R corner of the battery steel shell, observe whether there is any glue breakage or glue spillage during the gluing process, and observe whether there are bubbles and escape in the battery sealant after curing, and evaluate the performance of the battery sealant;

[0138] The method of the initial appearance test includes visual inspection;

[0139] The solid content test method includes GB / T 2793-1995;

[0140] The insulation test method includes a volume resistivity test, and the test method includes GB / T5654-1985;

[0141] The viscosity test method includes GB / T 2794-2022;

[0142] The performance tests of the battery prepared with the battery sealant include: battery high temperature resistance test, battery high temperature and high humidity resistance test and battery cold and heat shock resistance test;

[0143] The battery high temperature resistance performance test includes:

[0144] The battery is stored at 120° C. for 800 hours, and whether leakage occurs is determined based on the battery weight loss rate and appearance every 150 hours, and the internal resistance, voltage, and load voltage of the battery are detected, and whether the battery performance is abnormal is determined based on the data of the internal resistance, voltage, and load voltage;

[0145] The battery high temperature and high humidity resistance performance test includes:

[0146] The battery is stored in an environment with a temperature of 80°C and a humidity of 80% for 1200 hours. Whether leakage occurs is determined every 250 hours based on the battery weight loss rate and appearance. The internal resistance, voltage and load voltage of the battery are also tested. Whether the battery performance is abnormal is determined based on the internal resistance, voltage and load voltage data.

[0147] The battery thermal shock resistance test includes:

[0148] The battery is placed in a hot and cold shock box at -30°C and 140°C for 1200 hours, with hot and cold exchange performed every 40 minutes. Every 150 hours, whether leakage occurs is determined based on the battery weight loss rate and appearance, and the open circuit internal resistance, voltage and load voltage of the battery are tested. Whether the battery performance is abnormal is determined based on the internal resistance, voltage and load voltage data.

[0149] The comprehensive test method for battery sealant performance provided in Example 1 was used to test the performance of sealant 1 (commercially available single-component epoxy resin) and sealant 2 (commercially available two-component epoxy resin). The performance test results of sealant 1 are shown in Tables 1 and 2 (20 samples were taken for sealant 1 and sealant 2, respectively, and the performance test results are average values; wherein, weight loss rate of battery sealant % = (weight of battery sealant before storage - weight of battery sealant after storage) / weight of battery sealant before storage × 100%; weight loss rate of battery % = (weight of battery before storage - weight of battery after storage) / weight of battery before storage × 100%).

[0150] The comprehensive test method for battery sealant performance provided in Example 2 was used to test the performance of sealant 3 (commercially available styrene butadiene rubber 1) and sealant 4 (commercially available styrene butadiene rubber 2). The performance test results of sealant 1 are shown in Tables 3 and 4 (20 samples were taken for sealant 1 and sealant 2, respectively, and the performance test results are average values; wherein, weight loss rate of battery sealant % = (weight of battery sealant before storage - weight of battery sealant after storage) / weight of battery sealant before storage × 100%; weight loss rate of battery % = (weight of battery before storage - weight of battery after storage) / weight of battery before storage × 100%).

[0151] The comprehensive test method for battery sealant performance provided in Example 3 was used to test the performance of sealant 5 (commercially available silicone sealant 1) and sealant 6 (commercially available silicone sealant 2). The performance test results of sealant 1 are shown in Tables 5 and 6 (20 samples were taken for sealant 1 and sealant 2, respectively, and the performance test results are average values; wherein, weight loss rate of battery sealant % = (weight of battery sealant before storage - weight of battery sealant after storage) / weight of battery sealant before storage × 100%; weight loss rate of battery % = (weight of battery before storage - weight of battery after storage) / weight of battery before storage × 100%).

[0152] Table 1

[0153] Test items Sealant 1 Sealant 2 Sealant high temperature resistance (weight loss / %) 1.25 25.42 Sealant high temperature and high humidity resistance (weight loss rate / %) 0.51 9.8 Sealant low temperature resistance (weight loss / %) 0 0 Sealant thermal shock resistance (weight loss / %) 0.12 2.7 Sealant electrolyte resistance performance (weight loss rate / %) -0.28 5.61 Sealant performance (bubbles and escape) none none Initial appearance test transparent Light yellow Solid content (%) 90 95 Insulation (Volume resistivity / Ω·cm) <![CDATA[2.0×10 13 ]]> <![CDATA[1.0×10 15 ]]> Viscosity (mPa·s) 600 580

[0154] Table 2

[0155]

[0156]

[0157] Table 3

[0158]

[0159]

[0160] Table 4

[0161]

[0162] Table 5

[0163]

[0164]

[0165] Table 6

[0166]

[0167] In summary, the comprehensive testing method provided in the present invention not only tests the performance of the battery sealant itself, but also tests the performance of the battery prepared with the battery sealant. The performance tests of the battery prepared with the battery sealant include battery high temperature resistance performance test, battery high temperature and high humidity resistance performance test and battery cold and hot shock resistance performance test. It can comprehensively and accurately evaluate the performance of the sealant under various conditions to ensure that it meets the safety and stability requirements of the battery, and realizes a comprehensive and systematic test of the performance of the battery sealant. The comprehensive testing method can screen out the corresponding battery sealant according to different actual application requirements, thereby meeting the actual application requirements; in addition, the comprehensive testing method also has the advantages of simple operation, accurate testing and reliable results, and can provide strong technical support and decision-making basis for battery manufacturers.

[0168] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A comprehensive test method for battery sealant performance, characterized in that: The comprehensive testing method includes: testing the performance of the battery sealant itself, and testing the performance of the battery prepared with the battery sealant; The performance tests of the battery prepared with the battery sealant include: battery high temperature resistance test, battery high temperature and high humidity resistance test and battery cold and heat shock resistance test.

2. The comprehensive testing method according to claim 1, characterized in that: The performance tests of the battery sealant itself include: sealant high temperature resistance test, sealant high temperature and high humidity resistance test, sealant low temperature resistance test, sealant hot and cold shock resistance test, sealant electrolyte resistance test and sealant usage performance test.

3. The comprehensive testing method according to claim 2, characterized in that: The sealant high temperature resistance test includes: The battery sealant is stored at 80-120°C for 800-1200 hours, and the sealant is observed every 150-250 hours to see if there is any color change, cracks and bubbles, shrinkage deformation, or melt outflow. The weight of the battery sealant is recorded to calculate the weight loss rate, and the high temperature resistance of the battery sealant is evaluated; Preferably, the sealant high temperature and high humidity resistance test includes: The battery sealant is placed in an environment with a temperature of 40 to 80°C and a humidity of 80 to 95% and stored for 800 to 1200 hours. Every 150 to 250 hours, the battery sealant is observed for color changes, cracks, bubbles, shrinkage and deformation. The weight of the battery sealant is recorded to calculate the weight loss rate, and the high temperature and humidity resistance of the battery sealant is evaluated. Preferably, the sealant low temperature resistance test includes: The battery sealant is stored in an environment with a temperature of -50 to -30°C for 800 to 1200 hours. Every 150 to 250 hours, the battery sealant is observed for cracking and shrinkage. The weight of the battery sealant is recorded to calculate the weight loss rate and evaluate the low temperature resistance of the battery sealant. Preferably, the sealant thermal shock resistance test includes: The battery sealant was stored in a hot and cold shock box at -50 to -30°C and 100 to 140°C for 800 to 1200 hours, with hot and cold exchange performed every 20 to 40 minutes. The battery sealant was observed every 150 to 250 hours for any color changes, cracks, bubbles, shrinkage or deformation. The weight of the battery sealant was recorded to calculate the weight loss rate and evaluate the hot and cold shock resistance of the battery sealant.

4. The comprehensive testing method according to claim 2 or 3, characterized in that: The sealant electrolyte resistance performance test includes: The battery sealant is immersed in the battery electrolyte and stored in a set temperature environment for 20 to 40 days. Every 4 to 8 days, the battery sealant is observed to see if any chemical reaction such as swelling, dissolution or discoloration occurs, and the electrolyte resistance of the battery sealant is evaluated.

5. The comprehensive testing method according to any one of claims 2 to 4, characterized in that: The sealant performance test includes: Use a glass rod to dip a small amount of battery sealant and then drip it to observe whether there is any drawing. Use a glue coating machine to apply a circle of battery sealant on the inner wall or R corner of the battery steel shell, and observe whether there is any breakage or spillage during the gluing process. After curing, observe whether there are bubbles and escape in the battery sealant to evaluate the performance of the battery sealant.

6. The comprehensive testing method according to any one of claims 1 to 5, characterized in that: The battery high temperature resistance performance test includes: The battery is stored at 80-120°C for 800-1200 hours, and whether leakage occurs is determined based on the battery weight loss rate and appearance every 150-250 hours. The internal resistance, voltage and load voltage of the battery are also tested, and whether the battery performance is abnormal is determined based on the internal resistance, voltage and load voltage data.

7. The comprehensive testing method according to any one of claims 1 to 6, characterized in that: The battery high temperature and high humidity resistance test includes: The battery is placed in an environment with a temperature of 40-80°C and a humidity of 80-95% and stored for 800-1200 hours. Whether leakage occurs is determined every 150-250 hours based on the battery weight loss rate and appearance. The internal resistance, voltage and load voltage of the battery are also detected. Whether the battery performance is abnormal is determined based on the data of the internal resistance, voltage and load voltage.

8. The comprehensive testing method according to any one of claims 1 to 7, characterized in that: The battery thermal shock resistance test includes: The battery is placed in a hot / cold shock box at -50 to -30°C and 100 to 140°C for 800 to 1200 hours, with hot / cold exchange performed every 20 to 40 minutes. Whether leakage occurs is determined every 150 to 250 hours based on the battery weight loss rate and appearance, and the open circuit internal resistance, voltage and load voltage of the battery are tested. Whether the battery performance is abnormal is determined based on the internal resistance, voltage and load voltage data.

9. A battery sealant, characterized in that: The battery sealant is obtained by screening through the comprehensive testing method described in any one of claims 1 to 8.

10. A battery, characterized in that: The battery comprises the battery sealant according to claim 9.

Images