Method for testing performance of nickel-metal hydride battery

Abstract

The invention discloses a nickel-metal hydride battery performance testing method which comprises the following steps: A, cutting a positive plate, welding a positive tab 3 and wrapping a positive diaphragm bag in sequence to obtain a tested positive plate 1; b, cutting the negative plate, welding a negative tab 4 and wrapping a negative diaphragm bag in sequence to obtain a tested negative plate 2; c, sequentially stacking a fixed plate 5, an insulating plate 6, a test negative plate 2, a test positive plate 1, another test negative plate 2, another insulating plate 6 and another fixed plate 5; fixing by using a fixing piece 7 to obtain a battery core body; d, soaking the battery core body in the electrolyte 8, and taking out to obtain a test battery; and E, calculating the theoretical capacity of the test battery according to a formula C = (M1-M2) * 230mAh, and then carrying out performance test. According to the nickel-metal hydride battery performance test method provided by the invention, the reliability and the accuracy of the test result of the tested battery are improved on the premise of simplifying the test method and improving the test efficiency.

Description

Technical Field

[0001] The invention relates to the field of battery testing, and in particular to a performance testing method for a nickel-hydrogen battery. Background Art

[0002] In the rapidly developing test battery industry, test batteries have shown broad application prospects in hybrid electric vehicles (HEV), energy storage systems and many other fields due to their unique advantages such as safety and high power density. In order to ensure the continuous improvement and optimization of the performance of nickel-hydrogen batteries, it is particularly important to accurately and quickly test the performance of nickel-hydrogen batteries.

[0003] However, in the performance test process of existing nickel-hydrogen batteries, it is usually necessary to assemble a complete test battery before testing. The existing test battery assembly method includes placing the positive electrode, diaphragm, electrolyte and negative electrode in sequence, and adding gaskets, springs and other components to complete the assembly. Although the above assembly method can produce a complete test battery, in actual applications, it is limited by the assembly method and test process of the test battery, resulting in poor accuracy and reliability of the test results, which cannot meet actual usage requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a performance testing method for nickel-hydrogen batteries, which can improve the reliability and accuracy of the test results of the test batteries while simplifying the test method and improving the test efficiency, so as to overcome the shortcomings of the prior art.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A performance testing method for a nickel-hydrogen battery comprises the following steps:

[0007] A. Cut the positive electrode plate into a first preset shape to obtain a first intermediate positive electrode plate, weigh and record the weight as M1; weld a positive electrode ear 3 at the middle of the edge of the first intermediate positive electrode plate to obtain a second intermediate positive electrode plate; wrap the outer periphery of the second intermediate positive electrode plate with a positive electrode diaphragm bag, and expose the end of the positive electrode ear 3 to the positive electrode diaphragm bag to obtain a test positive electrode plate 1; wherein the positive electrode plate includes an electrode substrate and a conductive slurry layer;

[0008] B. cutting the negative electrode plate to a second preset shape to obtain a first intermediate negative electrode plate; welding a negative electrode ear 4 at the middle of the edge of the first intermediate negative electrode plate to obtain a second intermediate negative electrode plate; wrapping the outer periphery of the second intermediate negative electrode plate with a negative electrode diaphragm bag, and making the end of the negative electrode ear 4 exposed from the negative electrode diaphragm bag to obtain a test negative electrode plate 2; wherein the length of the first intermediate negative electrode plate is greater than the length of the first intermediate positive electrode plate, and the width of the first intermediate negative electrode plate is greater than the length of the first intermediate positive electrode plate;

[0009] C. stacking a fixing plate 5, an insulating plate 6, a test negative electrode plate 2, a test positive electrode plate 1, another test negative electrode plate 2, another insulating plate 6 and another fixing plate 5 in sequence to obtain an intermediate core; a fixing member 7 passes through a fixing plate 5, an insulating plate 6, another insulating plate 6 and another fixing plate 5 in sequence to fix the intermediate core to obtain a battery core;

[0010] D. Under vacuum environment, immerse the battery core in electrolyte 8, take it out and wipe the surface to obtain a test battery;

[0011] E. Calculate the theoretical capacity of the test battery according to the formula C = (M1-M2) × 230 mAh, and match the test cabinet channel to perform performance testing according to the theoretical capacity of the test battery; wherein M2 is the weight of the electrode substrate of the first intermediate positive plate.

[0012] Furthermore, the weighing process in step A is specifically as follows: cutting the positive electrode plate into a first preset shape to obtain a first intermediate positive electrode plate; weighing the first intermediate positive electrode plate after drying, and recording the weight as M1.

[0013] Further, in step A, the shape of the first intermediate positive electrode plate is rectangular, and the length of the first intermediate positive electrode plate is 66-70 mm, and the width is 46-50 mm;

[0014] In step B, the shape of the first intermediate negative electrode plate is rectangular, the length of the first intermediate negative electrode plate is 68-72 mm, and the width is 48-52 mm.

[0015] Further, step D is specifically as follows:

[0016] D. Use a multimeter to check whether the battery core has a short circuit; in a vacuum environment, immerse the battery core that has not a short circuit in the electrolyte 8, take it out and wipe the surface to obtain a test battery.

[0017] Furthermore, in step D, the immersion time is 5 to 10 minutes, and the vacuum degree of the vacuum environment is 0.05 to 0.1 MPa.

[0018] Furthermore, in step D, the raw materials of the electrolyte 8 include sodium hydroxide, lithium hydroxide, potassium hydroxide and water.

[0019] Furthermore, in the electrolyte 8, the concentrations of the sodium hydroxide, the lithium hydroxide and the potassium hydroxide are all 6-8 mol / L.

[0020] Furthermore, in step E, the specific method of the performance test is: after performing initial charge and discharge and activation charge and discharge on the test battery in sequence, a capacity test is performed.

[0021] Furthermore, the method further comprises step F, and step F is after step E;

[0022] F. Repeat steps A to E three times to obtain the performance test results of three test batteries; and obtain the final performance test result of the nickel-hydrogen battery based on the performance test results of the three test batteries.

[0023] The technical solution provided by the present invention may include the following beneficial effects:

[0024] 1. Exposing the positive electrode ear 3 outside the positive electrode diaphragm bag has the following advantages: (1) The positive electrode ear 3 is the connection point between the test positive electrode plate 1 and the external circuit and is responsible for transmitting current. Exposing it can ensure that the current can smoothly flow out or flow in from the test positive electrode plate 1 through the positive electrode ear 3 during the test, thereby ensuring the smooth progress of the test process; (2) The exposed positive electrode ear 3 facilitates the connection between the test positive electrode plate 1 and the test equipment during the test, which is not only conducive to improving the efficiency of the test, but also conducive to ensuring the accuracy of the test results; (3) The positive electrode ear 3 is firmly installed on the test positive electrode plate 1 by welding, which can effectively resist the mechanical stress and vibration that may be generated during the test, further improving the accuracy and reliability of the test results.

[0025] 2. Compared with the normal pressure environment, the vacuum environment is conducive to the electrolyte 8 to more fully infiltrate the test positive plate 1 and the test negative plate 2 in the battery core, thereby truly reflecting the charge and discharge performance and energy density of the test battery itself, and ensuring the accuracy of the test results. Therefore, in this technical solution, the battery core is immersed in the electrolyte 8 under a vacuum environment.

[0026] 3. The theoretical capacity of the test battery is calculated according to the formula C = (M1-M2) × 230mAh, ensuring that the test battery is tested under appropriate charge and discharge current and voltage conditions, which not only helps to accurately evaluate the core performance indicators of the test battery such as capacity, internal resistance, cycle life, but also helps to improve the accuracy of the test. In addition, by matching the test cabinet channels, the resources of the test equipment can be fully utilized, avoiding waste and unnecessary waiting time during the test process, which is conducive to improving test efficiency and reducing test costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of test battery assembly in a performance test method for a nickel-hydrogen battery of the present invention.

[0028] Among them: a test positive plate 1, a test negative plate 2, a positive electrode ear 3, a negative electrode ear 4, a fixing plate 5, an insulating plate 6, a fixing part 7, and an electrolyte 8. DETAILED DESCRIPTION

[0029] The present technical solution provides a performance testing method for a nickel-hydrogen battery, comprising the following steps:

[0030] A. Cut the positive electrode plate into a first preset shape to obtain a first intermediate positive electrode plate, weigh and record the weight as M1; weld a positive electrode ear 3 at the middle of the edge of the first intermediate positive electrode plate to obtain a second intermediate positive electrode plate; wrap the outer periphery of the second intermediate positive electrode plate with a positive electrode diaphragm bag, and expose the end of the positive electrode ear 3 to the positive electrode diaphragm bag to obtain a test positive electrode plate 1; wherein the positive electrode plate includes an electrode substrate and a conductive slurry layer;

[0031] B. cutting the negative electrode plate to a second preset shape to obtain a first intermediate negative electrode plate; welding a negative electrode ear 4 at the middle of the edge of the first intermediate negative electrode plate to obtain a second intermediate negative electrode plate; wrapping the outer periphery of the second intermediate negative electrode plate with a negative electrode diaphragm bag, and making the end of the negative electrode ear 4 exposed from the negative electrode diaphragm bag to obtain a test negative electrode plate 2; wherein the length of the first intermediate negative electrode plate is greater than the length of the first intermediate positive electrode plate, and the width of the first intermediate negative electrode plate is greater than the length of the first intermediate positive electrode plate;

[0032] C. stacking a fixing plate 5, an insulating plate 6, a test negative electrode plate 2, a test positive electrode plate 1, another test negative electrode plate 2, another insulating plate 6 and another fixing plate 5 in sequence to obtain an intermediate core; a fixing member 7 passes through a fixing plate 5, an insulating plate 6, another insulating plate 6 and another fixing plate 5 in sequence to fix the intermediate core to obtain a battery core;

[0033] D. Under vacuum environment, immerse the battery core in electrolyte 8, take it out and wipe the surface to obtain a test battery;

[0034] E. Calculate the theoretical capacity of the test battery according to the formula C = (M1-M2) × 230 mAh, and match the test cabinet channel to perform performance testing according to the theoretical capacity of the test battery; wherein M2 is the weight of the electrode substrate of the first intermediate positive plate.

[0035] In the performance test process of existing nickel-hydrogen batteries, it is usually necessary to assemble a complete test battery before testing. The existing test battery assembly method includes placing the positive electrode sheet, the diaphragm, the electrolyte 8 and the negative electrode sheet in sequence, and adding components such as gaskets and springs to complete the assembly. Although the above assembly method can produce a complete test battery, in actual applications, it is limited by the assembly method and test process of the test battery, resulting in poor accuracy and reliability of the test results, which cannot meet actual usage requirements.

[0036] In order to solve the above defects, the present technical scheme proposes a performance testing method for nickel-hydrogen batteries, including five steps: A (preparing a test positive electrode plate 1), B (preparing a test negative electrode plate 2), C (preparing a battery core), D (immersing in an electrolyte 8) and E (theoretical capacity calculation and testing). By optimizing the preparation process of the test battery and matching the test cabinet channel according to the theoretical capacity of the test battery, the test steps are simple, which is conducive to improving the reliability and accuracy of the test results while simplifying the test method and improving the test efficiency.

[0037] Specifically, the present invention provides a method for testing the performance of a nickel-hydrogen battery, comprising the following steps:

[0038] First, the positive electrode plate is cut into a first preset shape to obtain a first intermediate positive electrode plate, and the weight is weighed and recorded as M1, which provides a reliable data basis for the subsequent calculation of the theoretical capacity. After that, the positive electrode ear 3 is welded in the middle of the edge of the first intermediate positive electrode plate to obtain a second intermediate positive electrode plate; the outer periphery of the second intermediate positive electrode plate is wrapped with a positive electrode diaphragm bag, and the end of the positive electrode ear 3 is exposed outside the positive electrode diaphragm bag to obtain a test positive electrode plate 1. Specifically, by exposing the positive electrode ear 3 outside the positive electrode diaphragm bag, the following advantages are achieved: (1) The positive electrode ear 3 serves as the connection point between the test positive electrode plate 1 and the external circuit, and is responsible for transmitting current. Exposing it can ensure that during the test, the current can smoothly flow out or flow in from the test positive plate 1 through the positive ear 3, thereby ensuring the smooth progress of the test process; (2) The exposed positive ear 3 facilitates the connection of the test positive plate 1 with the test equipment during the test, which is not only conducive to improving the efficiency of the test, but also conducive to ensuring the accuracy of the test results; (3) The positive ear 3 is firmly mounted on the test positive plate 1 by welding, which can effectively resist the mechanical stress and vibration that may be generated during the test, and further improve the accuracy and reliability of the test results. It should be noted that in this technical solution, tape can also be attached to the outside of the positive ear 3 to prevent the burrs generated during the welding process from piercing the positive electrode diaphragm bag, thereby ensuring the accuracy of the test results.

[0039] Secondly, the negative electrode plate is cut to a second preset shape to obtain a first intermediate negative electrode plate, and the length of the first intermediate negative electrode plate is greater than the length of the first intermediate positive electrode plate, and the width of the first intermediate negative electrode plate is greater than the length of the first intermediate positive electrode plate, so that the first intermediate negative electrode plate can completely wrap the first intermediate positive electrode plate during the test process, preventing the test battery safety problems caused by size mismatch, thereby helping to ensure the accuracy of the test results of the test battery. At the same time, the first intermediate negative electrode plate is usually more fragile than the first intermediate positive electrode plate. Increasing the area of ​​the first intermediate negative electrode plate can reduce the deformation of the first intermediate negative electrode plate during the charging and discharging process, thereby improving the accuracy of the test results; in addition. Increasing the area of ​​the first intermediate negative electrode plate is also conducive to heat dissipation management during the test process, reducing the temperature of the test battery during the test process, and improving the safety of the test and the accuracy of the test results.

[0040] Furthermore, a negative electrode ear 4 is welded in the middle of the edge of the first intermediate negative electrode plate to obtain a second intermediate negative electrode plate; the outer periphery of the second intermediate negative electrode plate is wrapped with a negative electrode diaphragm bag, and the end of the negative electrode ear 4 is exposed to the negative electrode diaphragm bag, which can not only ensure that the current can smoothly flow out or flow in from the test negative electrode plate 2 through the negative electrode ear 4, thereby ensuring the smooth progress of the test process, but also facilitate the connection of the exposed negative electrode ear 4 with the test equipment, thereby improving the test efficiency and accuracy. In addition, fixing the negative electrode ear 4 by welding is conducive to resisting the mechanical stress and vibration that may be generated during the test process, and improving the reliability of the test results. It should be noted that the technical solution can stick tape on the outside of the negative electrode ear 4 to prevent welding burrs from piercing the negative electrode diaphragm bag, thereby ensuring the accuracy of the test results.

[0041] In addition, using a positive electrode diaphragm bag to wrap the periphery of the second intermediate positive electrode plate and using a negative electrode diaphragm bag to wrap the periphery of the second intermediate negative electrode plate has the following advantages: (1) Both the positive electrode diaphragm bag and the negative electrode diaphragm bag serve as solid barriers, which can effectively prevent the test negative electrode plate 2 from directly contacting the test positive electrode plate 1, causing short circuits, leakage and other safety hazards inside the obtained test battery, thereby ensuring the smooth progress of the test process; (2) Both the positive electrode diaphragm bag and the negative electrode diaphragm bag can help resist the potential impact of internal stress or vibration on the test battery structure, prevent it from being deformed or damaged during the test process, and thus improve the accuracy and reliability of the test results. It should be noted that the materials of the positive electrode diaphragm bag and the negative electrode diaphragm bag can be polyethylene, polypropylene, etc., and the specific types are not limited here.

[0042] In addition, a fixed plate 5, an insulating plate 6, a test negative plate 2, a test positive plate 1, another test negative plate 2, another insulating plate 6 and another fixed plate 5 are stacked in sequence to obtain an intermediate core; a fixing member 7 passes through a fixed plate 5, an insulating plate 6, another insulating plate 6 and another fixed plate 5 in sequence to fix the intermediate core to obtain a battery core, which can significantly improve the overall strength of the battery core, thereby ensuring the strength of the test battery, so that it can withstand greater external pressure and vibration, and avoid the test battery from being easily short-circuited when it is hit or squeezed, thereby affecting the accuracy and reliability of the test results. In addition, by arranging the test negative plate 2, the test positive plate 1, and the test negative plate 2, the voltage change, current distribution and energy conversion efficiency of the test battery during the charging and discharging process can be more realistically simulated to ensure the accuracy and reliability of the test results.

[0043] Thirdly, compared with the normal pressure environment, the vacuum environment is conducive to the electrolyte 8 to more fully infiltrate the test positive plate 1 and the test negative plate 2 in the battery core, thereby truly reflecting the charge and discharge performance and energy density of the test battery itself, and ensuring the accuracy of the test results. Therefore, the technical solution immerses the battery core in the electrolyte 8 under a vacuum environment.

[0044] In addition, during the charging process, the nickel hydroxide in the test positive plate 1 is oxidized to nickel hydroxide and produces hydroxide ions. If there is air in the test battery, the oxygen in the air will react with the hydroxide ions to generate hydrogen peroxide that hinders the migration of ions in the electrolyte 8 on the surface of the test positive plate 1, resulting in a decrease in the charging efficiency of the test battery. During the discharge process, since hydrogen peroxide will cover the surface of the test positive plate 1, it will affect the ion exchange between the test positive plate 1 and the electrolyte 8, thereby reducing the discharge capacity of the test battery, lowering the discharge platform, and making the discharge curve unstable, affecting the accuracy of the test results. Therefore, the technical solution immerses the battery core in the electrolyte 8 under a vacuum environment, and uses the vacuum environment to remove the air in the battery core, which is conducive to ensuring the accuracy and reliability of the test results.

[0045] Finally, the theoretical capacity of the test battery is calculated according to the formula C = (M1-M2) × 230mAh, ensuring that the test battery is tested under appropriate charge and discharge current and voltage conditions, which not only helps to accurately evaluate the core performance indicators of the test battery such as capacity, internal resistance, and cycle life, but also helps to improve the accuracy of the test. In addition, by matching the test cabinet channels, the resources of the test equipment can be fully utilized, avoiding waste and unnecessary waiting time during the test process, which is conducive to improving test efficiency and reducing test costs.

[0046] It should be noted that, since the positive plate includes an electrode substrate and a conductive paste layer, and the density of the electrode substrate is known, the weight of the electrode substrate can be calculated by simply knowing the volume of the electrode substrate. Since the electrode substrate generally has a pore structure, the conductive paste is mainly filled in the pore structure inside the electrode substrate, and a conductive paste layer is formed after drying and curing, making the volume of the electrode substrate very close to the volume of the positive plate. Therefore, in the present technical solution, the first intermediate positive plate is cut into a preset shape, and the volume of the first intermediate positive plate in the preset shape is directly measured to obtain the volume of the electrode substrate of the first intermediate positive plate. Subsequently, using the known density of the electrode substrate, the weight M2 of the electrode substrate of the first intermediate positive plate can be obtained.

[0047] To further illustrate, the weighing process in step A is specifically as follows: cutting the positive electrode plate into a first preset shape to obtain a first intermediate positive electrode plate; and weighing the first intermediate positive electrode plate after drying, and recording the weight as M1.

[0048] Since the first intermediate positive plate usually contains moisture, if it is weighed directly without drying, it is easy to affect the accuracy of the weighing of the first intermediate positive plate, and affect the accuracy of the calculation result of the theoretical capacity of the test battery. Therefore, in order to ensure the accuracy and reliability of the test results, the technical solution dries the first intermediate positive plate before weighing it.

[0049] Further, in step A, the shape of the first intermediate positive electrode plate is rectangular, and the length of the first intermediate positive electrode plate is 66-70 mm, and the width is 46-50 mm;

[0050] In step B, the shape of the first intermediate negative electrode plate is rectangular, the length of the first intermediate negative electrode plate is 68-72 mm, and the width is 48-52 mm.

[0051] If the size of the first intermediate positive plate and the first intermediate negative plate is too small, the capacity of the obtained test battery is limited, which can easily affect the accuracy and reliability of the test results; when the size of the first intermediate positive plate and the first intermediate negative plate is too large, the size of the required fixture is larger, which is inconvenient for testing and can easily reduce the test efficiency.

[0052] To further illustrate, step D is specifically as follows:

[0053] D. Use a multimeter to check whether the battery core has a short circuit; in a vacuum environment, immerse the battery core that has not a short circuit in the electrolyte 8, take it out and wipe the surface to obtain a test battery.

[0054] If there is a short circuit in the battery core, it may cause the test battery to overheat, expand, or even explode during the subsequent test process. Therefore, the short circuit problem can be discovered and eliminated in time through the multimeter test to ensure the safety of the test battery during the test process. It should be noted that when using a multimeter to detect whether the battery core has a short circuit, repeat steps A to C until the battery core does not have a short circuit.

[0055] Further, in step D, the immersion time is 5 to 10 minutes, and the vacuum degree of the vacuum environment is 0.05 to 0.1 MPa.

[0056] By limiting the immersion time and the vacuum degree, it is helpful to ensure that the test positive plate 1 and the test negative plate 2 can fully absorb the electrolyte 8, so as to more truly reflect the charging and discharging performance and energy density of the test battery itself, thereby ensuring the accuracy of the test results.

[0057] To further illustrate, in step D, the raw materials of the electrolyte 8 include sodium hydroxide, lithium hydroxide, potassium hydroxide and water.

[0058] By optimizing the raw materials of the electrolyte 8, the following benefits are achieved: (1) The solution formed by sodium hydroxide, lithium hydroxide, and potassium hydroxide in water is not easy to decompose or deteriorate, and can maintain stability for a long time, so that the electrolyte 8 has a high chemical stability, which is beneficial to extend the service life of the test battery and improve the accuracy and reliability of the test results of the test battery; (2) Sodium hydroxide, lithium hydroxide, and potassium hydroxide are all alkaline compounds, which make the electrolyte 8 have a high pH value. The alkaline environment of the electrolyte 8 is beneficial to inhibit harmful chemical reactions such as hydrogen evolution reaction and oxygen evolution reaction inside the test battery, thereby protecting the test battery. In addition, the higher pH value can also improve the corrosion resistance of the electrolyte 8 and reduce the corrosion and damage of the internal materials of the test battery; (3) Sodium hydroxide, lithium hydroxide, and potassium hydroxide are all strong electrolytes that can be completely ionized in water to produce a large number of free ions. During the charge and discharge process of the test battery, the ions in the electrolyte 8 can quickly migrate between the test positive plate 1 and the test negative plate 2, thereby achieving efficient energy conversion and improving the test efficiency.

[0059] It is further explained that in the electrolyte 8, the concentrations of the sodium hydroxide, the lithium hydroxide and the potassium hydroxide are all 6-8 mol / L.

[0060] By limiting the concentrations of sodium hydroxide, lithium hydroxide and potassium hydroxide, it is helpful to ensure the performance of the electrolyte 8 at a lower cost.

[0061] To further illustrate, in step E, the specific method of the performance test is: after the test battery is subjected to initial charge and discharge and activation charge and discharge in sequence, a capacity test is performed.

[0062] The test positive plate 1 and the test negative plate 2 are activated by initial charge and discharge, so that the test battery enters a normal working state from the initial state. Activation charge and discharge can further activate the test battery, so that the active substances of the test positive plate 1 and the test negative plate 2 can fully play their role, improve the capacity and cycle life of the test battery, and ensure the stability of its performance; in addition, by testing the capacity, it can be determined whether the test battery meets the design requirements, and provide accurate data support for the application of the test battery.

[0063] Preferably, the test battery is charged to 150% of its rated capacity at a current of 0.1C, then rested for 25 to 30 minutes, and then discharged at an initial current of 0.2C until the voltage drops to 1.0V, and rested for 6 to 10 minutes after the discharge is completed, completing the initial charge and discharge;

[0064] The specific method of the activation charge and discharge is as follows: the test battery that has completed the initial charge and discharge is charged to 130% of its rated capacity at a current of 0.2C, and then rested for 25 to 30 minutes, and then discharged under the condition of the initial current charging of 0.2C until the voltage drops to 1.0V, and rested for 8 to 10 minutes after the discharge is completed, and the activation charge and discharge is completed;

[0065] The specific method of the capacity test is: charge the activated charge and discharge test battery to 110% of its rated capacity at a current of 0.5C, then rest for 25 to 30 minutes, and then start discharging under the condition of an initial current charging of 0.5C until the voltage drops to 1.0V. After the discharge is completed, rest for 8 to 10 minutes to complete the initial capacity test; repeat the initial capacity test 5 to 7 times to complete the capacity test.

[0066] If a large current is used for the initial charge and discharge, serious polarization may occur on the test positive plate 1 and the test negative plate 2. Therefore, in the present technical solution, a small current is used for the initial charge and discharge, so that the chemical reaction inside the battery can be carried out more evenly while reducing the polarization phenomenon. In addition, long-term charging can ensure that the test positive plate 1 and the test negative plate 2 can be fully activated. It should be noted that polarization refers to the phenomenon that the potential on the surface of the electrode deviates from its equilibrium potential during the charge and discharge process of the battery.

[0067] After the initial charge, the test positive plate 1 and the test negative plate 2 have been activated and can withstand a slightly higher current. Therefore, the charging current of the activation charge and discharge is higher than the charging current of the initial charge and discharge to simulate the working conditions of the battery in actual use. In addition, by limiting the parameters of the capacity test, it is helpful to accurately measure the actual capacity of the battery and improve the accuracy of the test results.

[0068] Further description, step F is also included, and step F is located after step E;

[0069] F. Repeat steps A to E three times to obtain the performance test results of three test batteries; and obtain the final performance test result of the nickel-hydrogen battery based on the performance test results of the three test batteries.

[0070] When a single test battery is used for testing, the test results are prone to accidental errors. Therefore, the technical solution adopts multiple test batteries to improve the accuracy and reliability of the results.

[0071] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0072] Example 1

[0073] A. Cut the positive electrode plate to a first intermediate positive electrode plate with a length of 68 mm and a width of 48 mm, weigh and record the weight as 7.83 g; weld the positive electrode ear 3 at the middle of the edge of the first intermediate positive electrode plate to obtain a second intermediate positive electrode plate; wrap the outer periphery of the second intermediate positive electrode plate with a positive electrode diaphragm bag, and expose the end of the positive electrode ear 3 outside the positive electrode diaphragm bag to obtain a test positive electrode plate 1;

[0074] B. Cut the negative electrode plate to a first intermediate negative electrode plate with a length of 70 mm and a width of 50 mm; weld the negative electrode ear 4 at the middle of the edge of the first intermediate negative electrode plate to obtain a second intermediate negative electrode plate; wrap the outer periphery of the second intermediate negative electrode plate with a negative electrode diaphragm bag, and expose the end of the negative electrode ear 4 outside the negative electrode diaphragm bag to obtain a test negative electrode plate 2;

[0075] C. stacking a fixing plate 5, an insulating plate 6, a test negative electrode plate 2, a test positive electrode plate 1, another test negative electrode plate 2, another insulating plate 6 and another fixing plate 5 in sequence to obtain an intermediate core; a fixing member 7 passes through a fixing plate 5, an insulating plate 6, another insulating plate 6 and another fixing plate 5 in sequence to fix the intermediate core to obtain a battery core;

[0076] D. Use a multimeter to check whether the battery core has a short circuit; in a vacuum environment, immerse the battery core that has not short-circuited in the electrolyte 8 for 5 minutes, take it out and wipe the surface to obtain a test battery; wherein the vacuum degree of the vacuum environment is 0.1MPa; the raw materials of the electrolyte 8 include sodium hydroxide, lithium hydroxide, potassium hydroxide and water, and the concentrations of sodium hydroxide, lithium hydroxide and potassium hydroxide in the electrolyte 8 are all 6mol / L;

[0077] E. According to the formula C = (M1-M2) × 230mAh, the theoretical capacity of the test battery is calculated to be 1414.5mAh, and the performance test is performed according to the theoretical capacity of the test battery matching the test cabinet channel; wherein, the weight M2 of the electrode substrate of the first intermediate positive plate is 1.68g; the specific method of the performance test is: the test battery is subjected to initial charge and discharge and activation charge and discharge in sequence, and then the capacity test is performed;

[0078] F. Repeat steps A to E three times to obtain the performance test results of three test batteries; and obtain the final performance test result of the nickel-hydrogen battery based on the performance test results of the three test batteries.

[0079] Under the premise of keeping other use conditions the same, we compared the performance test results of the nickel-hydrogen battery in Example 1 with the performance of the nickel-hydrogen battery made of the same raw materials in actual applications. The results showed that the two showed a high degree of consistency in performance, proving that the test method adopted by the technical solution is not only highly accurate, but also highly reliable.

[0080] Example 2

[0081] A. Cut the positive electrode plate to a first intermediate positive electrode plate with a length of 68 mm and a width of 50 mm, weigh and record the weight as 8.18 g; weld the positive electrode ear 3 at the middle of the edge of the first intermediate positive electrode plate to obtain a second intermediate positive electrode plate; wrap the outer periphery of the second intermediate positive electrode plate with a positive electrode diaphragm bag, and expose the end of the positive electrode ear 3 outside the positive electrode diaphragm bag to obtain a test positive electrode plate 1;

[0082] B. Cut the negative electrode plate to a first intermediate negative electrode plate with a length of 72 mm and a width of 52 mm; weld the negative electrode ear 4 at the middle of the edge of the first intermediate negative electrode plate to obtain a second intermediate negative electrode plate; wrap the outer periphery of the second intermediate negative electrode plate with a negative electrode diaphragm bag, and expose the end of the negative electrode ear 4 outside the negative electrode diaphragm bag to obtain a test negative electrode plate 2;

[0083] C. stacking a fixing plate 5, an insulating plate 6, a test negative electrode plate 2, a test positive electrode plate 1, another test negative electrode plate 2, another insulating plate 6 and another fixing plate 5 in sequence to obtain an intermediate core; a fixing member 7 passes through a fixing plate 5, an insulating plate 6, another insulating plate 6 and another fixing plate 5 in sequence to fix the intermediate core to obtain a battery core;

[0084] D. Use a multimeter to detect whether the battery core has a short circuit; in a vacuum environment, immerse the battery core that has not short-circuited in the electrolyte 8 for 10 minutes, take it out and wipe the surface to obtain a test battery; wherein the vacuum degree of the vacuum environment is 0.05MPa; the raw materials of the electrolyte 8 include sodium hydroxide, lithium hydroxide, potassium hydroxide and water, and the concentrations of sodium hydroxide, lithium hydroxide and potassium hydroxide in the electrolyte 8 are all 7mol / L;

[0085] E. According to the formula C = (M1-M2) × 230mAh, the theoretical capacity of the test battery is calculated to be 1478.9mAh, and the performance test is performed according to the theoretical capacity of the test battery and the test cabinet channel is matched; wherein, the weight M2 of the electrode substrate of the first intermediate positive plate is 1.75g; the specific method of the performance test is: the test battery is subjected to initial charge and discharge and activation charge and discharge in sequence, and then the capacity test is performed;

[0086] F. Repeat steps A to E three times to obtain the performance test results of three test batteries; and obtain the final performance test result of the nickel-hydrogen battery based on the performance test results of the three test batteries.

[0087] Under the premise of keeping other use conditions the same, we compared the performance test results of the nickel-hydrogen battery in Example 2 with the performance of the nickel-hydrogen battery made of the same raw materials in actual applications. The results showed that the two showed a high degree of consistency in performance, proving that the test method adopted by the technical solution is not only highly accurate, but also highly reliable.

[0088] Example 3

[0089] A. Cut the positive electrode plate to a first intermediate positive electrode plate with a length of 66 mm and a width of 46 mm, weigh and record the weight as 7.65 g; weld the positive electrode ear 3 at the middle of the edge of the first intermediate positive electrode plate to obtain a second intermediate positive electrode plate; wrap the outer periphery of the second intermediate positive electrode plate with a positive electrode diaphragm bag, and expose the end of the positive electrode ear 3 outside the positive electrode diaphragm bag to obtain a test positive electrode plate 1;

[0090] B. Cut the negative electrode plate to a first intermediate negative electrode plate with a length of 68 mm and a width of 48 mm; weld the negative electrode ear 4 at the middle of the edge of the first intermediate negative electrode plate to obtain a second intermediate negative electrode plate; wrap the outer periphery of the second intermediate negative electrode plate with a negative electrode diaphragm bag, and expose the end of the negative electrode ear 4 outside the negative electrode diaphragm bag to obtain a test negative electrode plate 2;

[0091] C. stacking a fixing plate 5, an insulating plate 6, a test negative electrode plate 2, a test positive electrode plate 1, another test negative electrode plate 2, another insulating plate 6 and another fixing plate 5 in sequence to obtain an intermediate core; a fixing member 7 passes through a fixing plate 5, an insulating plate 6, another insulating plate 6 and another fixing plate 5 in sequence to fix the intermediate core to obtain a battery core;

[0092] D. Use a multimeter to detect whether the battery core has a short circuit; in a vacuum environment, immerse the battery core that has not short-circuited in the electrolyte 8 for 8 minutes, take it out and wipe the surface to obtain a test battery; wherein the vacuum degree of the vacuum environment is 0.05MPa; the raw materials of the electrolyte 8 include sodium hydroxide, lithium hydroxide, potassium hydroxide and water, and the concentrations of sodium hydroxide, lithium hydroxide and potassium hydroxide in the electrolyte 8 are all 8mol / L;

[0093] E. According to the formula C = (M1-M2) × 230mAh, the theoretical capacity of the test battery is calculated to be 1389.2mAh, and the performance test is performed according to the theoretical capacity of the test battery and the test cabinet channel is matched; wherein, the weight M2 of the electrode substrate of the first intermediate positive plate is 1.61g; the specific method of the performance test is: the test battery is subjected to initial charge and discharge and activation charge and discharge in sequence, and then the capacity test is performed;

[0094] F. Repeat steps A to E three times to obtain the performance test results of three test batteries; and obtain the final performance test result of the nickel-hydrogen battery based on the performance test results of the three test batteries.

[0095] Under the premise of keeping other use conditions the same, we compared the performance test results of the nickel-hydrogen battery in Example 3 with the performance of the nickel-hydrogen battery made of the same raw materials in actual applications. The results showed that the two showed a high degree of consistency in performance, proving that the test method adopted by the technical solution is not only highly accurate, but also highly reliable.

[0096] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A performance testing method for a nickel-hydrogen battery, characterized in that: The following steps are involved: A. Cut the positive electrode plate into a first preset shape to obtain a first intermediate positive electrode plate, weigh and record the weight as M1; weld a positive electrode ear 3 at the middle of the edge of the first intermediate positive electrode plate to obtain a second intermediate positive electrode plate; wrap the outer periphery of the second intermediate positive electrode plate with a positive electrode diaphragm bag, and expose the end of the positive electrode ear 3 to the positive electrode diaphragm bag to obtain a test positive electrode plate 1; wherein the positive electrode plate includes an electrode substrate and a conductive slurry layer; B. cutting the negative electrode plate to a second preset shape to obtain a first intermediate negative electrode plate; welding a negative electrode ear 4 at the middle of the edge of the first intermediate negative electrode plate to obtain a second intermediate negative electrode plate; wrapping the outer periphery of the second intermediate negative electrode plate with a negative electrode diaphragm bag, and making the end of the negative electrode ear 4 exposed from the negative electrode diaphragm bag to obtain a test negative electrode plate 2; wherein the length of the first intermediate negative electrode plate is greater than the length of the first intermediate positive electrode plate, and the width of the first intermediate negative electrode plate is greater than the length of the first intermediate positive electrode plate; C. stacking a fixing plate 5, an insulating plate 6, a test negative electrode plate 2, a test positive electrode plate 1, another test negative electrode plate 2, another insulating plate 6 and another fixing plate 5 in sequence to obtain an intermediate core; a fixing member 7 passes through a fixing plate 5, an insulating plate 6, another insulating plate 6 and another fixing plate 5 in sequence to fix the intermediate core to obtain a battery core; D. Under vacuum environment, immerse the battery core in electrolyte 8, take it out and wipe the surface to obtain a test battery; E. Calculate the theoretical capacity of the test battery according to the formula C = (M1-M2) × 230 mAh, and match the test cabinet channel to perform performance testing according to the theoretical capacity of the test battery; wherein M2 is the weight of the electrode substrate of the first intermediate positive plate.

2. A performance testing method for a nickel-hydrogen battery according to claim 1, characterized in that: The weighing process in step A is specifically as follows: cutting the positive electrode plate into a first preset shape to obtain a first intermediate positive electrode plate; weighing the first intermediate positive electrode plate after drying, and recording the weight as M1.

3. The performance testing method of a nickel-hydrogen battery according to claim 1, characterized in that: In step A, the shape of the first intermediate positive electrode plate is rectangular, and the length of the first intermediate positive electrode plate is 66-70 mm, and the width is 46-50 mm; In step B, the shape of the first intermediate negative electrode plate is rectangular, the length of the first intermediate negative electrode plate is 68-72 mm, and the width is 48-52 mm.

4. The performance testing method of a nickel-hydrogen battery according to claim 1, characterized in that: Step D is specifically as follows: D. Use a multimeter to check whether the battery core has a short circuit; in a vacuum environment, immerse the battery core that has not a short circuit in the electrolyte 8, take it out and wipe the surface to obtain a test battery.

5. The performance testing method of a nickel-hydrogen battery according to claim 1, characterized in that: In step D, the soaking time is 5 to 10 minutes, and the vacuum degree of the vacuum environment is 0.05 to 0.1 MPa.

6. The method for testing the performance of a nickel-hydrogen battery according to claim 1, characterized in that: In step D, the raw materials of the electrolyte 8 include sodium hydroxide, lithium hydroxide, potassium hydroxide and water.

7. A performance testing method for a nickel-hydrogen battery according to claim 6, characterized in that: In the electrolyte 8, the concentrations of the sodium hydroxide, the lithium hydroxide and the potassium hydroxide are all 6-8 mol / L.

8. The method for testing the performance of a nickel-hydrogen battery according to claim 1, characterized in that: In step E, the specific method of the performance test is: after performing initial charge and discharge and activation charge and discharge on the test battery in sequence, a capacity test is performed.

9. A performance testing method for a nickel-hydrogen battery according to claim 1, characterized in that: The method further comprises step F, wherein step F is located after step E; F. Repeat steps A to E three times to obtain the performance test results of three test batteries; and obtain the final performance test result of the nickel-hydrogen battery based on the performance test results of the three test batteries.

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