A detection method using a battery steel shell resistance detection device

Abstract

The present invention provides a detection method using a battery steel shell resistance detection device, wherein the detection device includes a power supply stabilizer, a pressure gauge, a resistance meter, a bracket, a pressure device and a mold; the pressure device is installed on the bracket, and the pressure device includes a vertically arranged lifting rod; the mold includes an upper mold and a lower mold; a battery steel shell accommodating groove is provided on the top surface of the lower mold, for the battery steel shell half obtained by axial cutting to be placed therein; the cross-sectional shape of the battery steel shell accommodating groove is adapted to the shell shape of the battery steel shell half; the upper mold is fixedly installed on the bottom of the lifting rod; the bottom of the upper mold can be embedded with the battery steel shell half placed in the battery steel shell accommodating groove; the pressure gauge is connected to the base of the lower mold, and is used to detect the pressure value borne by the lower mold; the resistance meter is electrically connected to the upper mold and the lower mold respectively, and is used to detect the resistance value between the upper mold and the lower mold; the pressure gauge and the resistance meter are electrically connected to the power supply stabilizer respectively, and the power supply stabilizer provides a stable input voltage.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a device and method for detecting the resistance of a battery steel shell. Background Art

[0002] Alkaline zinc-manganese batteries are highly sought after due to their high energy, high rate capability, excellent safety, and low storage self-discharge. They are a common power source for high-current devices used in our daily lives. Alkaline zinc-manganese batteries consist of five major components: a steel battery case, a positive electrode, a negative electrode, a separator, an electrolyte, and a current collector. The inner wall of the battery case is typically coated with a conductive current collector (for example, a conductive graphite layer formed by spraying and drying). This serves not only as a container but also as the current collector for the positive electrode. This current collector not only protects against corrosion but also improves discharge performance. Because the steel battery case and the current collector have excellent electrical conductivity and extremely low resistance, measuring the resistance of the battery case requires a resistance detection system with high precision and accuracy. Furthermore, the cylindrical shape of the alkaline zinc-manganese battery case, with its curved inner surface, complicates testing. Existing techniques typically use commercially available resistance meters to test the resistance of battery steel cases equipped with conductive current collectors through multi-point testing. This not only results in low test efficiency, but also in variations in the pressure applied by the probe to the battery steel case surface during each measurement, which can affect the precision and accuracy of the test. Consequently, existing resistance testing devices are unable to efficiently and accurately measure the resistance of battery steel cases, and therefore cannot provide an effective reference for selecting materials and formulations for surface coatings (e.g., conductive current collectors) in battery steel cases. Testing the discharge performance of alkaline zinc-manganese batteries can also reflect the quality of the materials and formulations of the battery steel case's surface coatings, but this results in significant material waste and low efficiency. Summary of the Invention

[0003] The first object of the present invention is to provide a battery steel shell resistance detection device.

[0004] A battery steel shell resistance detection device includes a power supply stabilizer, a pressure gauge, a resistance meter, a bracket, a pressure device and a mold;

[0005] The pressure device is mounted on the bracket, and the pressure device includes a vertically arranged lifting rod, and a lifting adjustment mechanism is provided on the top of the lifting rod and is adjusted by the lifting adjustment mechanism to move the lifting rod upward or downward;

[0006] The mold includes an upper mold and a lower mold arranged in correspondence with each other; a battery steel shell receiving groove is provided on the top surface of the lower mold for receiving the battery steel shell half obtained by axis cutting and lying therein; the cross-sectional shape of the battery steel shell receiving groove is adapted to the shell shape of the battery steel shell half; the upper mold is fixedly mounted on the bottom of the lifting rod; the bottom of the upper mold can be fitted with the battery steel shell half placed in the battery steel shell receiving groove;

[0007] The pressure gauge is connected to the base of the lower mold and is used to detect the pressure value borne by the lower mold;

[0008] The resistance meter is electrically connected to the upper mold and the lower mold respectively, and is used to detect the resistance value between the upper mold and the lower mold;

[0009] The pressure meter and the resistance meter are respectively electrically connected to the power supply regulator, and the power supply regulator provides a stable input voltage.

[0010] The mold shape of the battery steel shell resistance detection device of the present invention is adapted to the shape of the battery steel shell half, and is also equipped with a pressure device and a pressure gauge. Under the action of pressure, the battery steel shell half is well adapted and fitted with the upper mold and the lower mold. The pressure gauge can also ensure that the resistance is measured under constant pressure conditions, thereby realizing a one-time measurement of the battery steel shell resistance and ensuring the accuracy and precision of the detection.

[0011] Furthermore, the lifting adjustment mechanism is an adjustment handle, and the lifting rod is connected to the crossbeam of the bracket by threaded cooperation. The lifting of the lifting rod can be manually adjusted by rotating the adjustment handle, which is easy to operate.

[0012] Furthermore, the battery steel shell is cylindrical, and the bottom surface of the upper mold and the top surface of the lower mold are both arc-shaped.

[0013] Furthermore, the upper mold can be made of metal materials such as copper and stainless steel, and the lower mold can be made of metal materials such as copper and stainless steel.

[0014] A second object of the present invention is to provide a method for detecting the resistance of a battery steel shell using the battery steel shell resistance detection device described in the first object of the present invention, comprising the following steps:

[0015] (1) Turn on the power regulator and adjust it to a stable voltage;

[0016] (2) Turn on the resistance meter, and the power supply regulator provides a stable input voltage; after the resistance meter is preheated, start measuring;

[0017] (3) Turn on the pressure gauge, and the power regulator provides a stable input voltage; calibrate the pressure value of the pressure gauge to 0.0 kg, electrically connect the two resistance measuring connectors of the resistance meter to the upper mold and the lower mold respectively, adjust the pressure to a predetermined value, and press the reset button of the resistance meter to perform zero calibration;

[0018] (4) The battery steel shell half is placed horizontally between the upper mold and the lower mold, and then the lifting rod and the upper mold are adjusted downward by the lifting adjustment mechanism to clamp the battery steel shell half between the upper mold and the lower mold, and continue to move downward until the pressure value displayed on the pressure gauge reaches the predetermined value of 200±2kg in step (3), and the resistance value displayed on the resistance meter is the resistance of the battery steel shell.

[0019] Furthermore, when it is necessary to detect the resistance of a battery steel shell with a conductive current collector on its inner surface, the battery steel shell half of step (4) is a battery steel shell half with a conductive current collector on its inner surface. Furthermore, when it is necessary to detect the resistance of a conductive current collector, after step (3), first detect the resistance of the battery steel shell half not covered with a conductive current collector according to the operating steps of step (4) to obtain the resistance of the battery steel shell half not covered with a conductive current collector; then, cover the inner surface of the battery steel shell half not covered with a conductive current collector with a layer of conductive current collector to obtain the battery steel shell half with a conductive current collector on its inner surface; then detect the resistance of the battery steel shell half with a conductive current collector on its inner surface according to the operating steps of step (4) to obtain the resistance of the battery steel shell half with a conductive current collector on its inner surface; finally, calculate the resistance of the conductive current collector according to formula I;

[0020] R 膜 = R 壳+膜 -R 壳 Formula I

[0021] In Formula I, R 壳+膜 is: the resistance of the battery steel shell half with the conductive current collector covered on the inner surface; R 壳 is: the resistance of the half of the battery steel shell not covered with the conductive current collector; R 膜 is: the resistance of the conductive current collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the battery steel shell resistance detection device of the present invention;

[0023] Figure 2 This is a schematic diagram of the main structure when the mold clamps the battery steel shell half;

[0024] Figure 3It is a left-side structural schematic diagram of the mold clamping the battery steel shell half;

[0025] Figure 4 It is a structural diagram of a complete battery steel shell, and the dotted line is its central axis. DETAILED DESCRIPTION

[0026] The preferred embodiments of the battery steel shell resistance detection device and method of the present invention are described in detail below with reference to the accompanying drawings. Example 1

[0027] Combine Figures 1 to 4 A battery steel shell resistance detection device includes a power supply regulator 10, a pressure gauge 20, a resistance meter 30, a bracket 40, a pressure device 50 and a mold 60;

[0028] The pressure device 50 is mounted on the bracket 40 and includes a vertically arranged lifting rod 51. A lifting adjustment mechanism 52 is provided on the top of the lifting rod 51 and is adjusted by the lifting adjustment mechanism 52 to move the lifting rod 51 upward or downward.

[0029] The mold 60 includes an upper mold 61 and a lower mold 62 correspondingly arranged above and below. The top surface of the lower mold 62 is provided with a battery steel shell accommodating groove 620 for receiving the battery steel shell half 100 obtained by axial cutting. The cross-sectional shape of the battery steel shell accommodating groove 620 is adapted to the shell shape of the battery steel shell half 100. The upper mold 61 is fixedly mounted on the bottom of the lifting rod 51. The bottom of the upper mold 61 can be embedded with the battery steel shell half 100 placed in the battery steel shell accommodating groove 620.

[0030] The pressure gauge 20 is connected to the base of the lower mold 62 and is used to detect the pressure value borne by the lower mold 62;

[0031] The resistance meter 30 is electrically connected to the upper mold 61 and the lower mold 62 respectively, and is used to detect the resistance value between the upper mold 61 and the lower mold 62;

[0032] The pressure gauge 20 and the resistance meter 30 are respectively electrically connected to the power supply regulator 10, and the power supply regulator 10 provides a stable input voltage;

[0033] The power regulator 10 is powered by a power supply 200.

[0034] Combine Figures 1 to 4 The battery steel shell resistance detection method using the above-mentioned battery steel shell resistance detection device includes the following steps:

[0035] (1) Turn on the power regulator 10 and adjust it to 220V;

[0036] (2) Turn on the resistance meter 30 and allow the power supply regulator 10 to provide a stable input voltage; after the resistance meter 30 is preheated, start measuring;

[0037] (3) Turn on the pressure gauge 20 and provide a stable input voltage from the power regulator 10; calibrate the pressure value of the pressure gauge 20 to 0.0 kg, then electrically connect the two resistance measuring connectors on the resistance meter 30 to the upper mold 61 and the lower mold 62 respectively, and after adjusting the pressure to a predetermined value (200 kg), press the reset button of the resistance meter to perform zero calibration;

[0038] (4) The battery steel shell half 100 is placed horizontally between the upper mold 61 and the lower mold 62, and then the lifting rod 51 and the upper mold 61 are adjusted downward by the lifting adjustment mechanism 52, so that the battery steel shell half 100 is clamped between the upper mold 61 and the lower mold 62, and continues to move downward until the pressure value displayed on the pressure gauge 20 reaches 200kg±2kg, and the resistance value displayed on the resistance meter 30 is the resistance of the battery steel shell half 100.

[0039] In order to detect the resistance of the conductive current collector, in Example 1, the resistance of the battery steel shell half without the conductive current collector is first detected according to the operating steps of step (4) to obtain the resistance of the battery steel shell half without the conductive current collector; then, a layer of conductive current collector is covered on the inner surface of the battery steel shell half without the conductive current collector to obtain the battery steel shell half with the conductive current collector covered on the inner surface; then, the resistance of the battery steel shell half with the conductive current collector covered on the inner surface is detected according to the operating steps of step (4) to obtain the resistance of the battery steel shell half with the conductive current collector covered on the inner surface; finally, the resistance of the conductive current collector is calculated according to Formula I;

[0040] R 膜 = R 壳+膜 -R 壳 Formula I

[0041] In Formula I, R 壳+膜 is: the resistance of the battery steel shell half with the conductive current collector covered on the inner surface; R 壳 is: the resistance of the half of the battery steel shell not covered with the conductive current collector; R 膜 is: the resistance of the conductive current collector.

[0042] The mold 60 in Example 1 is a copper mold.

[0043] The battery steel shell half without conductive current collector in Example 1 is a battery steel shell 300 (such as Figure 4 The battery steel casing body with the conductive current collector coated on the inner surface is produced by coating the inner surface of the half of the battery steel casing not coated with the conductive current collector with graphite emulsion and drying it. The graphite emulsion used in Example 1 is formulated as follows: 10 parts by weight of a coupling agent and a binder are evenly dispersed in 60 parts by weight of a solvent to obtain a mixed slurry.

[0044] Then, 30 parts by weight of conductive graphite and carbon black were added to the mixed slurry in multiple portions until the mixture was evenly dispersed, thereby obtaining graphite emulsion A.

[0045] Using the same graphite emulsion formulation and dosage as in Example 1, the internal resistance data for ten battery steel case halves with conductive current collectors coated on their inner surfaces, and the corresponding battery steel case bodies and conductive current collectors without conductive current collectors, are shown in Table 1 below. The uniformity was calculated using the following formula II.

[0046] Uniformity = (1-(maximum resistance value - minimum resistance value) / average resistance value) * 100% Formula II

[0047] Table 1

[0048]

[0049] From the results in Table 1, it can be seen that the battery steel shell resistance detection device and detection method of the present invention have good resistance detection stability, and the uniformity of the conductive current collector resistance finally obtained by calculation reaches more than 76%.

[0050] The inventors also used graphite emulsions with three different conductive agent compositions as conductive current collector materials to form three different conductive current collectors (conductive current collectors A, B, and C) on the inner surface of the battery steel shell. The three different conductive current collectors were tested for resistance. The test results of different conductive current collectors are shown in Table 2 below.

[0051] The graphite emulsion formula corresponding to the conductive current collector A is the same as that of Example 1.

[0052] The graphite emulsion formula corresponding to the conductive current collector B is as follows: 10 parts by weight of a coupling agent and a binder are evenly dispersed with 60 parts by weight of a solvent to obtain a mixed slurry; then 30 parts by weight of conductive graphite, carbon black and graphene are added to the mixed slurry in multiple times until they are evenly dispersed to obtain graphite emulsion B.

[0053] The graphite emulsion formula corresponding to the conductive current collector C is as follows: 10 parts by weight of a coupling agent and a binder are evenly dispersed with 60 parts by weight of a solvent to obtain a mixed slurry; then 30 parts by weight of conductive graphite, carbon black, graphene and carbon nanotubes are added to the mixed slurry in multiple times until they are evenly dispersed to obtain graphite emulsion C.

[0054] Table 2

[0055]

[0056] Conductive current collectors A, B, and C under the same test number use battery steel shells with exactly the same structural parameters from the same batch.

[0057] The results in Table 2 show that there is a significant difference in the resistance test results of conductive current collectors with different formulations, which can effectively compare the differences between different conductive current collector formulations and materials, providing meaningful guidance for experimental design. In addition, in experiments 1 to 4, the resistance of conductive current collectors A, B, and C are as follows from high to low: conductive current collector A, conductive current collector B, and conductive current collector C. Conductive current collector C has the smallest resistance and the best conductive effect, showing good consistency over multiple tests.

[0058] The battery steel shell resistance detection device and detection method provided by the present invention can perform resistance detection on battery steel shells of any shape.

[0059] Of course, when the battery steel shells not covered with the conductive current collectors are from the same batch of products, the resistance of the battery steel shells not covered with the conductive current collectors is not tested. The advantages and disadvantages of different conductive current collector formulas and materials can be judged by simply comparing the resistance of the battery steel shells with the conductive current collectors covered on the inner surfaces.

[0060] In addition, the mold 60 can be, but is not limited to, a copper mold, and can also be a mold made of other metal materials such as stainless steel.

[0061] Further, such as Figure 1 As shown, the lifting adjustment mechanism 52 is an adjustment handle. The lifting rod 51 is threadedly connected to the crossbeam of the bracket 40. The lifting rod 51 can be manually adjusted by rotating the adjustment handle, which is simple to operate. Of course, the lifting adjustment mechanism 52 can also adopt other existing common lifting adjustment mechanisms such as a cylinder or a hydraulic cylinder.

[0062] like Figure 1 、 Figure 2 As shown, for a common alkaline zinc-manganese battery, the battery steel shell is cylindrical, and the bottom surface of the upper mold 61 and the top surface of the lower mold 62 are both arc-shaped.

[0063] During the specific implementation process, the upper mold 61 can be fixed to the bottom of the lifting rod 51 by screw locking, etc., and the lower mold 62 can be fixed to the lower mold base by screw locking, etc. Since the specific connection structure between the upper mold 61 and the lifting rod 51 and the specific connection structure between the lower mold 62 and the lower mold base both belong to the existing conventional technology, they are not shown.

[0064] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent process transformations made using the contents of the present invention specification, or any direct or indirect application in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A detection method using a battery steel shell resistance detection device, characterized in that: The detection device includes a power supply stabilizer, a pressure gauge, a resistance meter, a bracket, a pressure device and a mold; The pressure device is mounted on the bracket, and the pressure device includes a vertically arranged lifting rod, and a lifting adjustment mechanism is provided on the top of the lifting rod and is adjusted by the lifting adjustment mechanism to move the lifting rod upward or downward; The mold includes an upper mold and a lower mold arranged in correspondence with each other; a battery steel shell receiving groove is provided on the top surface of the lower mold for receiving the battery steel shell half obtained by axis cutting and lying therein; the cross-sectional shape of the battery steel shell receiving groove is adapted to the shell shape of the battery steel shell half; the upper mold is fixedly mounted on the bottom of the lifting rod; the bottom of the upper mold can be fitted with the battery steel shell half placed in the battery steel shell receiving groove; The pressure gauge is connected to the base of the lower mold and is used to detect the pressure value borne by the lower mold; The resistance meter is electrically connected to the upper mold and the lower mold respectively, and is used to detect the resistance value between the upper mold and the lower mold; The pressure meter and the resistance meter are electrically connected to the power supply regulator respectively, and the power supply regulator provides a stable input voltage; The detection method comprises the following steps: (1) Turn on the power regulator and adjust it to a stable voltage; (2) Turn on the resistance meter, and the power supply regulator provides a stable input voltage; after the resistance meter is preheated, start measuring; (3) Turn on the pressure gauge, and the power regulator provides a stable input voltage; calibrate the pressure value of the pressure gauge to 0.0 kg, electrically connect the two resistance measuring connectors of the resistance meter to the upper mold and the lower mold respectively, adjust the pressure to a predetermined value of 200 kg, and press the reset button of the resistance meter to perform zero calibration; (4) The battery steel shell half is placed horizontally between the upper mold and the lower mold, and then the lifting rod and the upper mold are adjusted downward by the lifting adjustment mechanism to clamp the battery steel shell half between the upper mold and the lower mold, and continue to move downward until the pressure value displayed on the pressure gauge reaches the predetermined value of 200kg±2kg in step (3), and the resistance value displayed on the resistance meter is the resistance of the battery steel shell.

2. The detection method using the battery steel shell resistance detection device according to claim 1, characterized in that: The lifting adjustment mechanism is an adjustment handle, and the lifting rod is threadedly connected to the crossbeam of the bracket.

3. The detection method using the battery steel shell resistance detection device according to claim 1, characterized in that: The battery steel shell is cylindrical, and the bottom surface of the upper mold and the top surface of the lower mold are both arc-shaped.

4. The detection method using the battery steel shell resistance detection device according to claim 1, characterized in that: The upper die is made of copper or stainless steel, and the lower die is made of copper or stainless steel.

5. The detection method using the battery steel shell resistance detection device according to claim 1, characterized in that: The battery steel shell half in step (4) is a battery steel shell half whose inner surface is covered with a conductive current collector.

6. The detection method using the battery steel shell resistance detection device according to claim 1, wherein after step (3), the resistance of the battery steel shell half not covered with the conductive current collector is first detected according to the operating steps of step (4) to obtain the resistance of the battery steel shell half not covered with the conductive current collector; then, a layer of conductive current collector is coated on the inner surface of the battery steel shell half not covered with the conductive current collector to obtain the battery steel shell half with the conductive current collector coated on the inner surface; then, the resistance of the battery steel shell half with the conductive current collector coated on the inner surface is detected according to the operating steps of step (4) to obtain the resistance of the battery steel shell half with the conductive current collector coated on the inner surface; finally, the resistance of the conductive current collector is calculated according to formula 1; R 膜 = R 壳+膜 -R 壳 Formula I In Formula I, R 壳+膜 is: the resistance of the battery steel shell half with the conductive current collector covered on the inner surface; R 壳 is: the resistance of the half of the battery steel shell not covered with the conductive current collector; R 膜 is: the resistance of the conductive current collector.

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