An assembly method for improving the test stability of button batteries

Abstract

The present invention discloses an assembly method for improving the test stability of button batteries, belonging to the technical field of button battery preparation. The steps of this assembly method for improving the test stability of button batteries are as follows: baking of electrode materials → weighing of samples → preparation of slurry by mixing ingredients → coating → drying → tablet pressing → punching of lithium sheets → drying and weighing → transferring into a glove box → placing the positive cap flat → placing a spring sheet → placing a stainless steel sheet → placing an annular gasket → placing a positive electrode sheet → injecting electrolyte → placing a separator sheet → placing a lithium sheet → covering with a negative cap → sealing; the thickness of the annular gasket is the same as that of the positive electrode sheet. During assembly, the positive electrode sheet is placed inside the annular gasket, and the use of a placer precisely positions the annular gasket and the positive electrode sheet, so that the centers of the positive cap, the annular gasket, and the positive electrode sheet are on the same vertical line, thereby ensuring the effect of battery assembly, improving the test stability of the battery, and avoiding the occurrence of short circuits in the battery.

Description

Technical Field

[0001] The present invention relates to the technology for preparing button batteries, and specifically to an assembly method for improving the test stability of button batteries. Background Art

[0002] In the lithium-ion battery material industry, for cathode materials (ternary materials, lithium iron phosphate, lithium cobaltate, etc.), the long-term cyclic electrical performance test period of these materials is relatively long (generally 1 month to 5 months), and it is impossible to obtain first-hand information about the materials. Therefore, lithium-ion battery cathode material manufacturers generally assemble button batteries and use cyclic voltammetry, AC impedance and other tests to quickly test data such as the first charge capacity, first discharge capacity, and first efficiency of the materials, so as to preliminarily judge whether the electrical performance of the materials can meet the technical requirements.

[0003] When the electrical performance of battery materials is abnormal, it is crucial for the stability of the material production line whether the button battery can accurately judge data such as the capacitance, first discharge capacity, and first efficiency of the materials and issue a warning.

[0004] At present, the assembly of button batteries by the vast majority of battery material manufacturers adopts a manual operation method. Due to the different assembly techniques of each worker, short-circuit phenomena occur in lithium-ion button batteries, so that the button cells cannot accurately reflect the electrical performance of the materials. At the same time, the problem of the gap when the battery material manufacturers and the battery cell manufacturers compare the button cells is very prominent.

[0005] The purpose of the present invention is to improve the assembly method of lithium-ion button batteries, so that the positive electrode, separator, and negative electrode of the button battery stack are always in the same axial direction, reducing the misalignment of the positive electrode, separator, and negative electrode caused by human factors, thereby improving the qualified rate of button batteries and enhancing the test stability of button batteries. Summary of the Invention

[0006] The purpose of the present invention is to overcome the difficulties in the above background art and provide an assembly method for improving the test stability of button batteries.

[0007] To achieve the above object, the technical solution adopted is an assembly method for improving the test stability of button batteries, characterized in that the assembly steps are: baking of electrode materials → weighing of samples → batching and slurry mixing → coating → drying → tabletting → punching lithium sheets → drying and weighing → transferring to a glove box → laying the positive cap flat → placing a spring sheet → placing a stainless steel sheet → placing an annular gasket → placing a positive electrode sheet → injecting electrolyte → placing a separator sheet → placing a lithium sheet → covering the negative cap → sealing; the thickness of the annular gasket is the same as that of the positive electrode sheet, and the positive electrode sheet is placed inside the annular gasket during assembly; the diameter of the positive electrode sheet is 11 mm, the width of the annular body of the annular gasket is 3 mm, and the outer diameter is 19 mm. The annular gasket is placed inside the positive cap, and the positive electrode sheet is placed inside the annular gasket on the positive cap. The diameter of the positive cap is 21 mm; the centers of the positive cap, the annular gasket, and the positive electrode sheet are on the same vertical line.

[0008] Further, the steps of placing the annular gasket and placing the positive electrode sheet are operated using a placer. The placer is provided with a base, and a positive cap clamping position is provided on the base. Above the positive cap clamping position, there are hanging posts and / or positive electrode sheet placement tubes.

[0009] Further, there are two positive cap clamping positions. The positions of the hanging posts and / or the positive electrode sheet placement tubes are respectively on the same vertical line as the centers of the two positive cap clamping positions. The top of the positive electrode sheet placement tube is provided with a handle and a hanging plate. The hanging plate fits with the top of the placer. One end of the positive electrode sheet placement tube away from the platform is provided with a three-claw opening, and an elastic clamp is provided on the three-claw opening. When the positive cap is placed into the positive cap clamping position corresponding to the positive electrode sheet placement tube, the three-claw opening is at a distance from the bottom of the positive cap equal to that of one positive electrode sheet.

[0010] Further, the outer diameter of the hanging post is 13.1 - 13.5 mm, and the length of the three-claw opening is 3 - 5 cm.

[0011] Further, the outer diameter of the hanging post is 13.16 mm, and the length of the three-claw opening is 4.24 cm.

[0012] Further, the steps of placing the annular gasket and placing the positive electrode sheet are as follows:

[0013] (1) Uniformly sleeved multiple annular gaskets on the hanging posts, and place the positive electrode sheet into the positive electrode sheet placement tube;

[0014] (2) Push the semi-finished battery with the stainless steel sheet placed flat into the positive cap clamping position below the hanging post. Use tweezers to pick off the annular gasket on the cylinder and place it into the positive cap, and use tweezers to transfer the positive cap to the positive cap clamping position below the positive electrode sheet placement tube.

[0015] (3) Push the elastic clamp at the three-jaw opening on the positive electrode sheet placement tube upward. The positive electrode sheet inside the positive electrode sheet placement tube will vertically fall into the circular gasket in the positive electrode cover. Then, push the elastic clamp towards the three-jaw opening on the circular tube, lift the handle at the top of the circular tube upward, and then pull the positive electrode cover outwards.

[0016] Further, the thickness of the circular gasket is the same as that of the positive electrode sheet, and the material of the circular gasket is the same as that of the separator sheet.

[0017] The beneficial effects of adopting the above scheme are as follows: This assembly method for improving the test stability of button batteries is: electrode material baking → weighing samples → ingredient mixing and slurrying → coating → drying → tablet pressing → punching lithium sheets → drying and weighing → transferring to a glove box → laying the positive electrode cover flat → placing a spring sheet → placing a stainless steel sheet → placing a circular gasket → placing a positive electrode sheet → injecting electrolyte → placing a separator sheet → placing a lithium sheet → covering the negative electrode cap → sealing; the thickness of the circular gasket is the same as that of the positive electrode sheet, and the positive electrode sheet is placed into the circular gasket during assembly; the diameter of the positive electrode sheet is 11 mm, the width of the ring body of the circular gasket is 3 mm, and the outer diameter is 19 mm. The circular gasket is placed inside the positive electrode cover, and the positive electrode sheet is placed inside the circular gasket on the positive electrode cover. The diameter of the positive electrode cover is 21 mm. In this invention, a circular gasket is added during the battery assembly process, and a placer is used to accurately place the positions of the circular gasket and the positive electrode sheet, thereby ensuring the effect of battery assembly, improving the test stability of the battery, and avoiding the occurrence of battery short circuits. Brief Description of the Drawings

[0018] Figure 1 It is a schematic flow chart of the assembly method for improving the test stability of button batteries according to the present invention.

[0019] Figure 2 It is an experimental analysis diagram of the battery discharge efficiency for battery assembly according to the present invention.

[0020] Figure 3 It is a schematic structural diagram of the placer in the present invention.

[0021] In the figure, 1. Handle; 2. Hanging plate; 3. Base; 4. Positive electrode sheet placement tube; 5. Three-jaw opening; 6. Elastic clamp; 7. Positive electrode cover clamping position; 8. Hanging post. Detailed Embodiments

[0022] Next, in combination with the specific embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described. The described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0023] Embodiment 1

[0024] As Figure 1 , an assembly method for improving the test stability of button batteries, the assembly steps are as follows: baking of electrode materials → weighing of samples → mixing and slurrying → coating → drying → pressing → punching lithium sheets → drying and weighing → transferring to a glove box → laying the positive cap flat → placing a spring sheet → placing a stainless steel sheet → placing an annular gasket → placing a positive electrode sheet → injecting electrolyte → placing a separator sheet → placing a lithium sheet → covering the negative cap → sealing; the thickness of the annular gasket is the same as that of the positive electrode sheet. When assembling, the positive electrode sheet is placed inside the annular gasket, and the use of a placer precisely positions the annular gasket and the positive electrode sheet, so that the centers of the positive cap, the annular gasket, and the positive electrode sheet are on the same vertical line, thereby ensuring the effect of battery assembly, improving the test stability of the battery, and avoiding the occurrence of battery short - circuit conditions.

[0025] The quality of battery assembly will directly affect the performance of the battery. Through battery components of the same material, experimental analysis of the battery discharge efficiency is carried out on control group 1, control group 2, and control group 3 for battery assembly.

[0026] Among them: For control group 1, a group of batteries is assembled. The battery assembly steps are as follows: baking of electrode materials → weighing of samples → mixing and slurrying → coating → drying → pressing → punching lithium sheets → drying and weighing → transferring to a glove box → laying the positive cap flat → placing a spring sheet → placing a stainless steel sheet → placing a positive electrode sheet → injecting electrolyte → placing a separator sheet → placing a lithium sheet → covering the negative cap → sealing → completion. After assembly, the first charge capacity test of the assembled button battery is carried out for 100 rapid test materials.

[0027] For control group 2, a group of batteries is assembled. The battery assembly steps are as follows: baking of electrode materials → weighing of samples → mixing and slurrying → coating → drying → pressing → punching lithium sheets → drying and weighing → transferring to a glove box → laying the positive cap flat → placing a spring sheet → placing a stainless steel sheet → placing an annular gasket → placing a positive electrode sheet → injecting electrolyte → placing a separator sheet → placing a lithium sheet → covering the negative cap → sealing → completion. In this group of batteries, the positive electrode sheet is assembled without gaps inside the annular gasket. After assembly, the first charge capacity test of the assembled button battery is carried out for 100 rapid test materials.

[0028] For control group 3, a group of batteries is assembled. The battery assembly steps are as follows: baking of electrode materials → weighing of samples → mixing and slurrying → coating → drying → pressing → punching lithium sheets → drying and weighing → transferring to a glove box → laying the positive cap flat → placing a spring sheet → placing a stainless steel sheet → placing an annular gasket → placing a positive electrode sheet → injecting electrolyte → placing a separator sheet → placing a lithium sheet → covering the negative cap → sealing → completion. In this group of batteries, the positive electrode sheet is assembled with a 1 - mm gap inside the annular gasket, and the annular gasket is placed inside the positive cap with a 1 - mm gap between the outer wall of the annular gasket and the positive cap. After assembly, the first charge capacity test of the assembled button battery is carried out for 100 rapid test materials.

[0029] The experimental data is Figure 2 , from Figure 2 it can be seen that the batteries in Control Group 1 retained 95% of their initial capacity after 100 cycles, the batteries in Control Group 2 retained 90%, and the batteries in Control Group 3 only retained 80%. Therefore, it can be analyzed that the capacity loss is directly related to the misalignment degree of the three battery electrode sheets. Lithium plating occurs in the area where the positive electrode is not covered by the negative electrode. The capacity of the battery material is not fully released, resulting in a low measured capacity of the test battery material and a false warning. At the same time, when the electrode sheets shift in the same direction, the positive and negative electrode sheets are too close, and there may be an arc during battery charging and discharging, causing the positive and negative electrodes to connect and resulting in a battery short circuit. Therefore, the position of the electrode sheets needs to be ensured during the battery assembly process.

[0030] Through experiments, it is concluded that when the positive and negative electrode sheets are misaligned in the opposite direction on the same diameter, some positive electrode sheets cannot be completely covered by the negative electrode sheets, so the capacity cannot be fully released. When the positive and negative electrode sheets are misaligned in the same direction on the same diameter, the distance between the positive and negative electrode sheets is too close, and short circuit events are likely to occur. Therefore, when assembling a button battery, the role of the circular gasket will increase the capacitance release of the button battery and also achieve the situation of short circuit of the positive and negative electrodes during battery operation. Therefore, in the assembly of button batteries, the placement accuracy of the circular gasket and the positive electrode sheet is very important.

[0031] In the experiment, the diameter of the positive electrode sheet is 11 mm, the width of the ring body of the circular gasket is 3 mm, and the outer diameter is 19 mm. The circular gasket is placed inside the positive electrode cover, and the positive electrode sheet is placed inside the circular gasket on the positive electrode cover. The diameter of the positive electrode cover is 21 mm. After the circular gasket is placed, the gap with the positive electrode cover is 1 mm. After this application, when assembling the battery, the circular gasket tightly clamps the positive electrode sheet in the 1 mm gap, effectively avoiding the movement of the positive electrode sheet, and the diameter of the circular gasket is not the same as that of the positive electrode cover. This application achieves the effect that the placement of the circular gasket does not affect the charge and discharge of the capacitance in the button battery. After multiple experiments, the effect is the best when the circular gasket is placed inside the positive electrode cover with a 1 mm gap from the positive electrode cover.

[0032] Example 2

[0033] Such as Figure 3 , in order to improve the assembly effect of the button battery, the steps of placing the circular gasket and the positive electrode sheet are operated by a placer. The placer is provided with a base 3, a positive electrode cover holder 7 is provided on the base 3, and a hanging post 8 and / or a positive electrode sheet placement tube 4 are provided above the positive electrode cover holder 7.

[0034] There are two positive electrode cover clamping positions 7. The positions of the hanging posts 8 and / or the positive electrode sheet placement tubes 4 are respectively on the same vertical line as the centers of the two positive electrode cover clamping positions 7. The top of the positive electrode sheet placement tube 4 is provided with a handle 1 and a hanging plate 2. The hanging plate 2 fits against the top of the placer. One end of the positive electrode sheet placement tube 4 away from the platform is provided with a three-claw opening 5. An elastic clamp 6 is provided on the three-claw opening 5. When the positive electrode cover is placed into the positive electrode cover clamping position 7 corresponding to the positive electrode sheet placement tube 4, the three-claw opening 5 is at a distance from the bottom of the positive electrode cover equal to the distance for one positive electrode sheet.

[0035] The outer diameter of the hanging post 8 is 13.1 - 13.5 mm, and the length of the three-claw opening 5 is 3 - 5 cm.

[0036] After conducting multiple experiments, it was found that the size of the outer diameter of the hanging post 8 and the length of the three-claw opening 5 both affect the effect of using the placer to place the ring gasket and the positive electrode sheet. Therefore, two experiments were conducted to demonstrate the optimal lengths of the hanging post 8 and the length of the three-claw opening 5.

[0037] Experiment on the outer diameter of the hanging post 8

[0038] After multiple tests, it was found that the outer diameter of the hanging post 8 affects the falling position of the ring gasket. In the battery assembly, the sizes of the ring gasket and the positive electrode cover remain unchanged (the outer diameter of the positive electrode cover is 21 mm, and the inner diameter of the ring gasket is 13 mm), the temperature of the glove box is kept constant at 20 °C, and an experiment was conducted with the outer diameter of the hanging post as the variable.

[0039] Put the ring gasket onto the hanging post 8, place the positive electrode cover onto the positive electrode cover clamping position 7, and use a special tweezer to gently push down the ring gasket to make it fall into the center of the positive electrode cover. Repeat 50 groups of experiments and record the photos with a fixed-height camera, then measure and calculate the average maximum distance between the ring gasket and the edge of the positive electrode cover, as well as the situation of the ring gasket falling. The results are as follows:

[0040] Outer diameter of hanging column Average maximum spacing Number of automatic slides Number of bounces or non - falls 13.0mm 1.46mm 3 0 13.1mm 1.30mm 0 0 13.2mm 1.24mm 0 0 13.3mm 1.52mm 0 4 13.4mm 1.58mm 0 9 13.5mm 1.69mm 0 21

[0041] From the experimental data in the above table, it can be seen that it is more appropriate to set the outer diameter of the hanging post 8 to 13.1 - 13.2 mm. Then, repeat 20 groups of experiments with the outer diameter of the hanging post 8 set to 13.12 mm, 13.14 mm, 13.16 mm, and 13.18 mm. It is concluded that when the outer diameter of the hanging post 8 is 13.16 mm, the average maximum distance between the ring gasket and the positive electrode cover is closest to 1.2 mm, and the outer diameter of the hanging post 8 of 13.16 mm is obtained as the best outer diameter for use.

[0042] Experiment on the length of the three-claw opening 5

[0043] After multiple experiments, it was found that the length of the three-jaw opening 5 affects the falling position of the positive electrode sheet. In battery assembly, the sizes of the circular gasket and the positive electrode cover remain unchanged (the outer diameter of the positive electrode cover is 21 mm, and the inner diameter of the circular gasket is 13 mm), the temperature of the glove box is kept constant at 20 °C, and an experiment is carried out with the outer diameter of the hanging post as a variable.

[0044] Place the positive electrode sheet on the positive electrode sheet placement tube 4. Place the positive electrode cover with the circular gasket placed inside it (the maximum distance between the circular gasket and the edge of the positive electrode cover is 1 mm) into the positive electrode cover clamping position 7 directly below the positive electrode sheet placement tube 4. Then push the elastic clamp 6 towards the three-jaw opening 5 on the round tube, lift the handle 1 at the top of the round tube upwards, and then pull the positive electrode cover outwards so that the positive electrode sheet falls into the positive electrode cover. Repeat 50 groups of experiments and record the photos with a fixed-height camera, and then measure and calculate the average maximum distance between the circular gasket and the edge of the positive electrode sheet, as well as the situation of the round positive electrode sheet falling. As follows:

[0045] Opening length of three - jaw Average maximum spacing Number of automatic slides Number of bounces or non - falls 3.0cm 1.68mm 11 2 3.5 1.63 0 0 4.0 1.42 0 0 4.5 1.57 4 7 5.0 1.85 9 18

[0046] From the experimental data in the above table, it can be seen that the length of the three-jaw opening 5 being 4.0 - 4.5 cm is more appropriate. When the length of the three-jaw opening 5 is set to 4.1 cm, 4.2 cm, 4.3 cm, 4.4 cm, and 4.5 cm and repeated 20 groups, when the length of the three-jaw buckle is 4.20 - 4.30, the average maximum distance between the circular gasket and the positive electrode sheet is closest to 1.38 mm. Then, when the length of the three-jaw opening 5 is set to 4.21 cm, 4.22 cm, 4.23 cm, 4.24 cm, 4.25 cm, 4.26 cm, 4.27 cm, 4.28 cm, 4.29 cm and repeated 20 groups, it is found that when the length of the three-jaw opening 5 is 4.24 cm, the average maximum distance between the circular gasket and the positive electrode sheet is closest to 1.19 mm, and the optimal use length of the three-jaw opening 5 is obtained as 4.24 cm.

[0047] In summary, from the experiment on the outer diameter of the hanging post 8 and the experiment on the length of the three-jaw opening 5, it is obtained that the optimal outer diameter of the best hanging post 8 is 13.16 mm, and the optimal length of the best three-jaw opening 5 is 4.24 cm.

[0048] Example 3

[0049] The steps of placing the circular gasket and the positive electrode sheet are as follows:

[0050] (1) Uniformly sleeved multiple circular gaskets on the hanging post 8, and place the positive electrode sheet into the positive electrode sheet placement tube 4;

[0051] (2) Place the semi-finished battery with the stainless steel sheet flat and push it into the positive electrode cover slot 7 below the hanging post 8. Use tweezers to remove the ring gasket on the cylinder and place it into the positive electrode cover. Then use tweezers to transfer the positive electrode cover to the positive electrode cover slot 7 below the positive electrode sheet placement tube 4.

[0052] (3) Push the elastic clamp 6 at the three-claw opening 5 on the positive electrode sheet placement tube 4 upward. The positive electrode sheet in the positive electrode sheet placement tube 4 will vertically fall into the ring gasket in the positive electrode cover. Then push the elastic clamp 6 towards the three-claw opening 5 on the round tube, lift the handle 1 at the top of the round tube upward, and then pull the positive electrode cover outwards.

[0053] The thickness of the ring gasket is the same as that of the positive electrode sheet, and the material of the ring gasket is the same as that of the separator sheet.

[0054] In order to compare the battery assembly effects of manual and placer operations, a set of control experiments were carried out. A worker was used to assemble the battery using tweezers and a placer respectively. During the experiment, the diameter of the positive electrode sheet used was 11 mm, the width of the ring body of the ring gasket was 3 mm, the outer diameter was 19 mm, and the diameter of the positive electrode cover was 21 mm. Among them:

[0055] Control group 1: A worker assembled 100 sets of button batteries. During the battery assembly steps, the worker used tweezers to hold and place the ring gasket and the positive electrode sheet.

[0056] Control group 2: A worker assembled 100 sets of button batteries. During the battery assembly steps, the worker used a placer to place the ring gasket and the positive electrode sheet.

[0057] During the experiment, the experimental data of control group 1 and control group 2 were measured and collected. The experimental data were:

[0058] Item / Group Control Group 1 Control Group 2 Maximum spacing between ring gasket and positive electrode 1.6mm 1.1mm Minimum spacing between ring gasket and positive electrode 0.4mm 0.9mm Maximum spacing between ring gasket and positive electrode cover 1.8mm 1.2mm Minimum spacing between ring gasket and positive electrode cover 0.2mm 0.8mm Maximum average spacing between ring gasket and positive electrode 1.4mmm 1.14mm Maximum average spacing between ring gasket and positive electrode cover 1.45mm 1.21mm

[0059] The conclusion drawn in Example 1 is that in the assembly of button batteries, after the ring gasket is placed, the interval between the ring gasket and the positive electrode cover is 1 mm, and the best battery capacitance release effect is achieved when the ring gasket is placed in the positive electrode cover with an interval of 1 mm from the positive electrode cover.

[0060] From this experiment, it can be seen that according to the requirements of Example 1, for the 100 sets of batteries assembled in control group 1, when using tweezers to place the ring gasket and the positive electrode sheet in control group 1, the maximum distance, minimum distance, maximum distance from the ring gasket to the positive electrode cover, minimum distance from the ring gasket to the positive electrode cover, average maximum distance between the ring gasket and the positive electrode sheet, and average maximum distance between the ring gasket and the positive electrode cover are all not ideal. The distances between the ring gasket and the positive electrode sheet in the battery assembly using manual operation are all far from the ideal value of 1 mm.

[0061] A series of problems were also found in Control Group 1. When workers used tweezers to operate the circular gasket and the positive electrode plate, since the materials of the circular gasket and the positive electrode plate were relatively soft, the workers caused varying degrees of damage to the shapes of the circular gasket and the positive electrode plate during assembly, which would then affect the capacitance storage and capacitance release of the battery.

[0062] In Control Group 2, during the assembly of 100 groups of batteries, workers used a placer to assemble the circular gasket and the positive electrode plate. The positive electrode cover clamping position 7 of the placer determined the position of the positive electrode cover, and then the positive electrode plate placement tube 4 and the hanging post 8 of the placer determined the placement positions of the positive electrode plate and the circular gasket, making the battery assembly more accurate. Among the 100 groups of battery assemblies, the effect of the placer was far greater than that of manual placement. The maximum distance, minimum distance, maximum distance between the circular gasket and the positive electrode cover, minimum distance between the circular gasket and the positive electrode cover, average maximum distance between the circular gasket and the positive electrode plate, and average maximum distance between the circular gasket and the positive electrode cover were all closest to the optimal distance of 1 mm.

[0063] From the 100 - group battery assembly experiments in Control Group 1 and Control Group 2, it can be referred that the application of the placer greatly improved the placement accuracy of the circular gasket and the positive electrode plate, thereby ensuring the effect of battery assembly and improving the stability of battery testing.

[0064] Example 4

[0065] Using the same aluminum foil sheet coated with ternary positive electrode material, 200 pieces of positive electrode materials were taken, and the centroid tests of 200 coin - type batteries were carried out. The centroid offsets were arranged from small to large, and the assembly accuracy of the coin - type battery stack was judged by testing the centroid and centroid deviation of the coin - type battery.

[0066] Through multiple comparative experiments, it was found that the coin - type batteries assembled by the present invention could discharge stably, and the probability of short - circuit was greatly reduced, achieving the effect of stably testing the capacity of the battery. The greater the misalignment of the battery assembly, the greater the centroid offset; therefore, the assembly accuracy of the coin - type battery stack can be judged by testing the centroid and centroid deviation of the coin - type battery.

[0067] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above - mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non - restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0068] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An assembly method for improving the test stability of button batteries, characterized in that, the assembly steps are as follows: Bake the electrode material → Weigh the sample → Mix and adjust the slurry → Coat the film → Dry → Press into tablets → Punch lithium tablets → Dry and weigh → Transfer to a glove box → Place the positive cap flat → Place the spring sheet → Place the stainless steel sheet → Place the ring gasket → Place the positive electrode sheet → Inject the electrolyte → Place the separator sheet → Place the lithium sheet → Cover the negative cap → Seal; The thickness of the ring gasket is the same as that of the positive electrode sheet, and the positive electrode sheet is placed inside the ring gasket during assembly; The diameter of the positive electrode sheet is 11 mm, the width of the ring body of the ring gasket is 3 mm, and the outer diameter is 19 mm. The ring gasket is placed inside the positive cap, the positive electrode sheet is placed inside the ring gasket on the positive cap, and the diameter of the positive cap is 21 mm; the centers of the positive cap, the ring gasket, and the positive electrode sheet are on the same vertical line; The steps of placing the ring gasket and the positive electrode sheet are operated using a placer. The placer is provided with a base (3), and a positive cap positioning slot (7) is provided on the base (3). Above the positive cap positioning slot (7), there are hanging posts (8) and / or positive electrode sheet placement tubes (4); there are two positive cap positioning slots (7), and the positions of the hanging posts (8) and / or positive electrode sheet placement tubes (4) are respectively on the same vertical line as the centers of the two positive cap positioning slots (7). The top of the positive electrode sheet placement tube (4) is provided with a handle (1) and a hanging plate (2), and the hanging plate (2) fits with the top of the placer. One end of the positive electrode sheet placement tube (4) away from the platform is provided with a three-claw opening (5), and an elastic clamp (6) is provided on the three-claw opening (5). When the positive cap is placed into the positive cap positioning slot (7) corresponding to the positive electrode sheet placement tube (4), the three-claw opening (5) is at a distance from the bottom of the positive cap to one positive electrode sheet; The steps of placing the ring gasket and the positive electrode sheet are as follows: (1) Uniformly sleeved multiple ring gaskets on the hanging posts (8), and place the positive electrode sheets into the positive electrode sheet placement tubes (4); (2) Push the semi-finished battery with the stainless steel sheet placed flat into the positive cap positioning slot (7) below the hanging posts (8), use tweezers to pick off the ring gasket on the cylinder and place it into the positive cap, and use tweezers to transfer the positive cap to the positive cap positioning slot (7) below the positive electrode sheet placement tube (4); (3) Push the elastic clamp (6) at the three-claw opening (5) of the positive electrode sheet placement tube (4) upward, the positive electrode sheet in the positive electrode sheet placement tube (4) will vertically fall into the ring gasket in the positive cap, then push the elastic clamp (6) towards the three-claw opening (5) on the round tube, lift the handle (1) at the top of the round tube upward, and then pull the positive cap outwards.

2. The assembly method for improving the test stability of button batteries according to claim 1, characterized in that: The outer diameter of the hanging post (8) is 13.1 - 13.5 mm, and the length of the three-claw opening (5) is 3 - 5 cm.

3. The assembly method for improving the test stability of button batteries according to claim 2, characterized in that: The outer diameter of the hanging post (8) is 13.16 mm, and the length of the three-claw opening (5) is 4.24 cm.

4. The assembling method for improving the test stability of the button battery according to claim 1, characterized in that: the thickness of the circular gasket is the same as that of the positive electrode sheet, and the material of the circular gasket is the same as that of the separator sheet.

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