Battery steel shell resistance detection device and method

Abstract

The invention provides a battery steel shell resistance detection device and method. The detection device comprises a power supply voltage stabilizer, a pressure meter, a resistance meter, a bracket, a pressure applying device and a mold, the pressure applying device is installed on the support and comprises a vertically-arranged lifting rod. The die comprises an upper die and a lower die; a battery steel shell accommodating groove is formed in the top surface of the lower die, and a battery steel shell half body obtained by shaft cutting is horizontally arranged in the battery steel shell accommodating groove; the section shape of the battery steel shell accommodating groove is matched with the shell shape of the battery steel shell half body; the upper die is fixedly mounted at the bottom of the lifting rod; the bottom of the upper die can be embedded with a battery steel shell half body placed in the battery steel shell accommodating groove; the pressure gauge is connected with a base of the lower die and used for detecting the value of pressure borne by the lower die. The resistance meter is electrically connected with the upper die and the lower die and used for detecting the resistance value between the upper die and the lower die. And the pressure gauge and the resistance meter are electrically connected with the power supply stabilizer respectively, and stable input voltage is provided by the power supply stabilizer.

Description

Technical Field

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

[0002] Alkaline zinc-manganese batteries are favored by the general public due to their high energy, high rate, high safety, and low storage self-discharge. They are commonly used as energy supply batteries for high-current working equipment used in our daily lives. Alkaline zinc-manganese batteries are composed of five major parts: battery steel shell, positive electrode, negative electrode, diaphragm, electrolyte, and current collector. Usually, a layer of conductive current collector (for example, a conductive graphite layer formed by spraying and drying) is covered on the inner wall of the battery steel shell. Therefore, the battery steel shell is not only a container, but also a current collector for the positive electrode. In addition, the conductive current collector can not only prevent corrosion, but also improve discharge performance. Since the battery steel shell and the conductive current collector have good conductivity and extremely low resistance, the resistance detection system needs to have high precision and accuracy when detecting the resistance of the battery steel shell. In addition, since the battery steel shell of the alkaline zinc-manganese battery is cylindrical and its inner side is curved, the difficulty of testing is increased. In the prior art, most of the resistance meters purchased on the market are used to test the resistance of the battery steel shell with a conductive current collector through multi-point detection. Not only is the test efficiency low, but the difference in the pressing force of the probe on the surface of the battery steel shell during each measurement will also affect the precision and accuracy of the detection. Therefore, the existing resistance detection device cannot achieve efficient and accurate resistance detection of the battery steel shell, and cannot provide an effective reference for screening the materials and formulas of the surface covering layer (such as the conductive current collector) of the battery steel shell. The discharge performance of the alkaline zinc-manganese battery can also reflect the quality of the materials and formulas of the surface covering layer of the battery steel shell, but it will cause a large waste of raw materials 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, comprising 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, 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 comprises an upper mold and a lower mold which are arranged correspondingly from top to bottom; a battery steel shell receiving groove is arranged on the top surface of the lower mold, for placing the half-body of the battery steel shell obtained by axial cutting in it; the cross-sectional shape of the battery steel shell receiving groove is adapted to the shell shape of the half-body of the battery steel shell; the upper mold is fixedly mounted on the bottom of the lifting rod; the bottom of the upper mold can be fitted with the half-body of the battery steel shell placed in the battery steel shell receiving groove; The pressure gauge is connected to the base of the lower die and is used to detect the pressure value borne by the lower die; The resistance meter is electrically connected to the upper die and the lower die respectively, and is used to detect the resistance value between the upper die and the lower die; The pressure meter and the resistance meter are respectively electrically connected to the power supply stabilizer, and the power supply stabilizer provides a stable input voltage.

[0005] The mold shape of the battery steel shell resistance detection device of the present invention is compatible with the shape of the battery steel shell half, and a pressure device and a pressure gauge are also configured. Under the action of pressure, the battery steel shell half has a good adaptation and fit effect 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, while also ensuring the accuracy and precision of the detection.

[0006] Furthermore, the lifting adjustment mechanism is an adjustment handle, and the lifting rod is threadedly connected to the crossbeam of the bracket. The lifting of the lifting rod can be manually adjusted by rotating the adjustment handle, which is easy to operate.

[0007] 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.

[0008] Furthermore, the upper mold may be made of a metal material such as copper or stainless steel, and the lower mold may be made of a metal material such as copper or stainless steel.

[0009] The second object of the present invention is to provide a battery steel shell resistance detection method using the battery steel shell resistance detection device described in the first object of the present invention, comprising 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 die and the lower die respectively, adjust the pressure to a predetermined value, 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 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.

[0010] Furthermore, when it is necessary to detect the resistance of the battery steel shell with a conductive current collector on the inner surface, the battery steel shell half of step (4) is a battery steel shell half with a conductive current collector on the inner surface. Furthermore, when it is necessary to detect the resistance of the conductive current collector, after step (3), firstly detect the resistance of the battery steel shell half without the conductive current collector according to the operation steps of step (4) to obtain the resistance of the battery steel shell half without the conductive current collector; then, lay a layer of conductive current collector 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 on the inner surface; then detect the resistance of the battery steel shell half with the conductive current collector on the inner surface according to the operation steps of step (4) to obtain the resistance of the battery steel shell half with the conductive current collector on the inner surface; finally, calculate the resistance of the conductive current collector according to formula I; R(membrane) =R(shell+membrane)-R(shell) Formula Ⅰ In Formula I, R(shell+film) is the resistance of the battery steel shell half whose inner surface is covered with a conductive current collector; R(shell) is the resistance of the battery steel shell half not covered with a conductive current collector; R(film) is the resistance of the conductive current collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the battery steel shell resistance detection device of the present invention; Figure 2 It is a schematic diagram of the main structure when the mold clamps the battery steel shell half; Figure 3 It is a left-side structural schematic diagram of the mold clamping the battery steel shell half; Figure 4 It is a structural diagram of a complete battery steel shell, and the dotted line is its central axis. DETAILED DESCRIPTION

[0012] The preferred embodiments of the battery steel shell resistance detection device and method of the present invention are described in detail below in conjunction with the accompanying drawings. Example 1

[0013] Combination Figure 1 to Figure 4 , a battery steel shell resistance detection device, including a power regulator 10, a pressure gauge 20, a resistance meter 30, a bracket 40, a pressure device 50 and a mold 60; The pressure device 50 is installed on the bracket 40, and the pressure device 50 includes a vertically arranged lifting rod 51, and 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 upward or downward; The mold 60 includes an upper mold 61 and a lower mold 62 which are arranged correspondingly from top to bottom. A battery steel shell accommodating groove 620 is provided on the top surface of the lower mold 62, for the battery steel shell half body 100 obtained by axial cutting to lie therein; the cross-sectional shape of the battery steel shell accommodating groove 620 is adapted to the shell shape of the battery steel shell half body 100; the upper mold 61 is fixedly installed at the bottom of the lifting rod 51; the bottom of the upper mold 61 can be embedded with the battery steel shell half body 100 placed in the battery steel shell accommodating groove 620; 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; The resistor 30 is electrically connected to the upper die 61 and the lower die 62 respectively, and is used to detect the resistance value between the upper die 61 and the lower die 62; The pressure gauge 20 and the resistor 30 are electrically connected to the power stabilizer 10 respectively, and the power stabilizer 10 provides a stable input voltage; The power regulator 10 is powered by a power source 200 .

[0014] Combination Figure 1 to Figure 4 The battery steel shell resistance detection method using the battery steel shell resistance detection device comprises the following steps: (1) Turn on the power regulator 10 and adjust the voltage to 220V; (2) Turn on the resistor meter 30, and the power regulator 10 provides a stable input voltage; after the resistor meter 30 is preheated, start measuring; (3) Turn on the pressure gauge 20, and the power regulator 10 provides a stable input voltage; calibrate the pressure value of the pressure gauge 20 to 0.0 kg, and 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; (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 by the lifting adjustment mechanism 52 to move downward together, 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 resistor 30 is the resistance of the battery steel shell half 100.

[0015] 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 operation 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 laid 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 on the inner surface; then, the resistance of the battery steel shell half with the conductive current collector on the inner surface is detected according to the operation steps of step (4) to obtain the resistance of the battery steel shell half with the conductive current collector on the inner surface; finally, the resistance of the conductive current collector is calculated according to formula I; R(membrane) =R(shell+membrane)-R(shell) Formula Ⅰ In Formula I, R(shell+film) is the resistance of the battery steel shell half whose inner surface is covered with a conductive current collector; R(shell) is the resistance of the battery steel shell half not covered with a conductive current collector; R(film) is the resistance of the conductive current collector.

[0016] The mold 60 of Example 1 is a copper mold.

[0017] The battery steel shell half body without the conductive current collector of Example 1 is a battery steel shell 300 (such as Figure 4 The battery steel shell body with the conductive current collector on the inner surface is obtained by coating the graphite emulsion on the inner surface of the battery steel shell half body without the conductive current collector and drying it. The formula of the graphite emulsion used in Example 1 is as follows: 10 parts by weight of coupling agent and binder are evenly dispersed with 60 parts by weight of solvent to obtain a mixed slurry; and 30 parts by weight of conductive graphite and carbon black are added to the mixed slurry several times until they are evenly dispersed to obtain graphite emulsion A.

[0018] Using the same graphite emulsion formula and usage in Example 1, the internal resistance data of 10 battery steel shell halves with conductive current collectors on the inner surface and the corresponding battery steel shell bodies and conductive current collectors without conductive current collectors are shown in Table 1. The uniformity is calculated by the following formula II.

[0019] Uniformity = (1-(maximum resistance value-minimum resistance value) / average resistance value)*100% Formula II Table 1

[0020] 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 collector resistance finally obtained by calculation reaches more than 76%.

[0021] The inventors also used three graphite emulsions with different conductive agent components as conductive current collector materials, formed three different conductive current collectors (conductive current collectors A, B, and C) on the inner surface of the battery steel shell, and performed resistance tests on the three different conductive current collectors respectively. The test results of different conductive current collectors are shown in Table 2 below.

[0022] Among them, the graphite emulsion formula corresponding to the conductive current collector A is the same as the graphite emulsion formula of Example 1.

[0023] The graphite emulsion formula corresponding to the conductive current collector B is: 10 parts by weight of coupling agent and binder are evenly dispersed with 60 parts by weight of solvent to obtain a mixed slurry; and then 30 parts by weight of conductive graphite, carbon black and graphene are added to the mixed slurry several times until it is evenly dispersed to obtain graphite emulsion B.

[0024] The graphite emulsion formula corresponding to the conductive current collector C is as follows: 10 parts by weight of coupling agent and binder are evenly dispersed with 60 parts by weight of solvent to obtain a mixed slurry; and 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.

[0025] Table 2

[0026] 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.

[0027] It can be seen from the results in Table 2 that the resistance test results of conductive current collectors with different formulations are significantly different, which can effectively compare the differences between different conductive current collector formulations and materials, and provide meaningful guidance for experimental design; and in experiments 1 to 4, the resistances of conductive current collectors A, B, and C are, 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 in multiple tests.

[0028] 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.

[0029] Of course, when the battery steel shells without conductive current collectors are from the same batch of products, the resistance of the battery steel shells without conductive current collectors is not tested. The advantages and disadvantages of different conductive current collector formulas and materials can be judged only by comparing the resistance of the battery steel shells with conductive current collectors on the inner surfaces.

[0030] In addition, the mold 60 may be, but is not limited to, a copper mold, and may also be a mold made of other metal materials such as stainless steel.

[0031] Further, such as Figure 1 As shown, the lifting adjustment mechanism 52 is an adjustment handle, and the lifting rod 51 is threadedly connected with the crossbeam of the bracket 40. The lifting and lowering of the lifting rod 51 can be manually adjusted by rotating the adjustment handle, which is easy 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.

[0032] like Figure 1 , Figure 2 As shown, for a common alkaline zinc-manganese battery, the battery steel shell is cylindrical, and the bottom surface shape of the upper mold 61 and the top surface shape of the lower mold 62 are both arc-shaped.

[0033] In the specific implementation process, the upper mold 61 can be fixed to the bottom of the lifting rod 51 by screw locking or the like, and the lower mold 62 can be fixed to the lower mold base by screw locking or the like. 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.

[0034] 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 changes made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery steel shell resistance detection device, characterized in that: It includes a power stabilizer, a pressure gauge, a resistor, 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, 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 comprises an upper mold and a lower mold which are arranged correspondingly from top to bottom; a battery steel shell receiving groove is arranged on the top surface of the lower mold, for placing the half-body of the battery steel shell obtained by axial cutting in it; the cross-sectional shape of the battery steel shell receiving groove is adapted to the shell shape of the half-body of the battery steel shell; the upper mold is fixedly mounted on the bottom of the lifting rod; the bottom of the upper mold can be fitted with the half-body of the battery steel shell placed in the battery steel shell receiving groove; The pressure gauge is connected to the base of the lower die and is used to detect the pressure value borne by the lower die; The resistance meter is electrically connected to the upper die and the lower die respectively, and is used to detect the resistance value between the upper die and the lower die; The pressure meter and the resistance meter are respectively electrically connected to the power supply stabilizer, and the power supply stabilizer provides a stable input voltage.

2. 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 with the crossbeam of the bracket.

3. 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 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. A method for detecting the resistance of a battery steel shell using the battery steel shell resistance detection device according to any one of claims 1 to 4, characterized in that: The following steps are involved: (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 die and the lower die respectively, adjust the pressure to a predetermined value, 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 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.

6. The battery steel shell resistance detection method according to claim 5, 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 collector.

7. The method for detecting the resistance of a battery steel shell according to claim 5, wherein after step (3), the resistance of the battery steel shell half without a conductive current collector is first detected according to the operation steps of step (4) to obtain the resistance of the battery steel shell half without a conductive current collector; then, a layer of conductive current collector is laid on the inner surface of the battery steel shell half without a conductive current collector to obtain the battery steel shell half with a conductive current collector on the inner surface; then, the resistance of the battery steel shell half with a conductive current collector on the inner surface is detected according to the operation steps of step (4) to obtain the resistance of the battery steel shell half with a conductive current collector on the inner surface; finally, the resistance of the conductive current collector is calculated according to formula I; R(membrane) =R(shell+membrane)-R(shell) Formula Ⅰ In Formula I, R(shell+film) is the resistance of the battery steel shell half whose inner surface is covered with a conductive current collector; R(shell) is the resistance of the battery steel shell half not covered with a conductive current collector; R(film) is the resistance of the conductive current collector.

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