A high-capacitance 400909 battery and its preparation method

Abstract

The present invention belongs to the technical field of lithium batteries, and specifically relates to a high-capacitance 400909 model battery and a preparation method thereof, comprising a battery cell and a shell, characterized in that it also comprises a drying device; the shell is provided with an external pole ear; the battery cell is fixedly connected to the shell, and the pole ear of the battery cell is electrically connected to the external pole ear; the drying device is located inside the shell, and the drying device comprises a rotating shaft, a torsion spring and a drying box, one end of the rotating shaft is fixedly connected to the shell, and the other end is rotatably connected to the drying box, the torsion spring is coaxially arranged with the rotating shaft, one end of the torsion spring is fixedly connected to the shell, and the other end is fixedly connected to the drying box, and a desiccant is arranged inside the drying box. In this solution, because the drying box can rotate, the desiccant can fully contact the water mist, thereby improving the use of the desiccant.

Description

Technical Field

[0001] The present invention is used in the technical field of lithium batteries, and particularly relates to a high-capacitance 400909 model battery and a preparation method thereof. Background Art

[0002] The 400909 model battery is a 3.7V lithium battery cell with a capacity of about 140mAh / g. A lithium battery is a type of battery with lithium metal or lithium alloy as the positive / negative electrode material and using a non-aqueous electrolyte solution. The lithium metal battery was first proposed and studied by Gilbert N. Lewis in 1912. In the 1970s, M.S. Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become the mainstream.

[0003] The 400909 model battery on the market is mostly a super-small battery with a length of 9 mm, a width of 9 mm, and a thickness of 4 mm, and is commonly used in Bluetooth headsets.

[0004] Currently, on the market is the core structure for Bluetooth headsets with the patent number CN215184342U, including the core structure for Bluetooth headsets including a core, an ear tab glue, and an ear tab metal strip. The ear tab glue is clamped between the core and the ear tab metal strip. The ear tab glue is used for electrically isolating the core and the ear tab metal strip. The ear tab glue seals the open end of the core. At least part of the ear tab glue is exposed to the outside. The part of the ear tab glue exposed to the outside is hemispherical. The ear tab metal strip is made of a conductive material. The ear tab metal strip is used for connecting external components.

[0005] Reduces the size of the ear tab glue exposed outside the core, and solves the interference of the ear tab glue at the exposed part of the core when installed in a Bluetooth headset.

[0006] However, there are also some problems. 1. There is no drying protection device. 2. Even if there is a drying protection device, only the contact surface desiccant can dry the water mist, and the inside cannot absorb moisture. 3. There is no alarm mechanism when the core appears abnormal, especially this kind of earphone core, which is more likely to cause harm to the human body. Summary of the Invention

[0007] This solution provides a high-capacitance 400909 model battery to solve the problem of insufficient water absorption by the desiccant inside the battery.

[0008] To achieve the above objectives, this solution provides a high-capacitance 400909 model battery, including a core, a housing, and a drying device; the housing is provided with an external ear tab;

[0009] The battery cell is fixedly connected to the housing, and the tab of the battery cell is electrically connected to an external tab.

[0010] The drying device is located inside the housing. The drying device includes a rotating shaft, a torsion spring, and a drying box. One end of the rotating shaft is fixedly connected to the housing, and the other end is rotatably connected to the drying box. The torsion spring is coaxially arranged with the rotating shaft. One end of the torsion spring is fixedly connected to the housing, and the other end is fixedly connected to the drying box. A desiccant is provided inside the drying box.

[0011] The principle of this solution is as follows: When water mist appears inside the housing, the desiccant inside the drying box absorbs it. In previous devices, due to a large amount of desiccant, most of the desiccant was in the middle position and could not contact the water mist, resulting in only a part of many desiccants being used. In this solution, when the earphone moves with the user, the drying box swings through the rotating shaft, allowing the desiccant to fully contact the water mist, enabling the desiccant to fully absorb the water mist. At the same time, the torsion spring will provide a counter-torque force, so that the swing amplitude of the drying box will not hit the housing, preventing noise generation.

[0012] The beneficial effects of this solution are as follows: 1. The desiccant inside the housing moves repeatedly, enabling the desiccant to fully absorb moisture.

[0013] Furthermore, it further includes an air intake channel, a whistle, and a gas-producing box. The gas-producing box is fixedly connected to the drying box. A thermal-sensitive plate is provided in the middle of the gas-producing box. The thermal-sensitive plate divides the gas-producing box into a first cavity and a second cavity. An aluminum sulfate solution is provided inside the first cavity, and a sodium bicarbonate solution is provided in the second cavity. The air intake channel is fixedly connected to the gas-producing box. The air outlet of the air intake channel is communicated with the air inlet of the whistle. The air inlet of the air intake channel is communicated with the first cavity. A blocking block is provided at the connection between the air inlet of the air intake channel and the first cavity. When the humid environment causes the short circuit of the tab of the battery cell and the battery cell generates abnormal high temperature approaching explosion, the high temperature will melt the thermal-sensitive partition, causing the aluminum sulfate and sodium bicarbonate solutions to mix together, generating a large amount of carbon dioxide gas. The pressure generated by the gas will push open the blocking block, and then the gas will rush from the air inlet of the intake channel to the air outlet of the intake channel and enter the whistle. The whistle will emit a harsh alarm sound to remind the user that the earphone is about to explode, enabling the user to stay away from danger in advance.

[0014] Furthermore, the whistle is rotatably connected to the first air outlet. A propeller is fixedly provided inside the whistle. The propeller is coaxially arranged with the air inlet of the whistle. When the gas enters the whistle, the structure of the propeller can generate a rotational force on the entering gas on the whistle, causing the whistle to rotate. When rotating, the direction of the air flow outlet of the whistle is constantly changing, and the reaction force brought by the air flow causes the drying box to swing violently, hitting the housing and generating an impact sound, further enhancing the alarm sound of the earphone explosion.

[0015] Further, the air outlet of the intake passage is rotatably connected to the intake port of the whistle by a rolling bearing. The rolling bearing is located between the air outlet and the whistle, which plays a role in reducing friction and making the whistle rotate more smoothly.

[0016] Further, an impact block is fixedly provided on the drying box. The impact block impacts the housing under the pushing action of the whistle, making the sound louder when the drying box impacts the housing and not damaging the housing.

[0017] Further, the housing is provided with a heat dissipation port. The heat dissipation port is to prevent the temperature inside the battery cell from being too high and causing an explosion.

[0018] Further, it also includes a battery cell protective sleeve, which is fixedly connected to the battery cell and cooperates with the positive electrode tab and the negative electrode tab. The battery cell protective sleeve is to prevent interference between the positive electrode tab and the negative electrode tab, resulting in a short circuit.

[0019] This solution also discloses a preparation method for a battery of model 400909 with high capacitance, including the following steps:

[0020] Step S10: The positive electrode active material uses 811 high-nickel ternary material, and the production method uses the calcium carbide method. The raw pulp produced by the calcium carbide method is wrapped with copper foil and then cut into coils by an automatic slitting machine. The coils are processed by an automatic tabbing machine for overwelding and pasting to make positive electrode coils;

[0021] Step S20: The negative electrode uses high-capacity and high-compaction graphite, and the production method uses the calcium carbide method. The raw pulp produced by the calcium carbide method is wrapped with copper foil and then cut into coils by an automatic slitting machine. The coils are processed by an automatic tabbing machine for overwelding and pasting to make negative electrode coils;

[0022] Step S30: After the positive and negative electrodes are tabbed, the coils are automatically wound into a core; the finished battery cell housing matching the core is formed by an automatic shelling machine, and the battery cell is encapsulated into a battery cell through a top and side sealing integrated machine;

[0023] Step S40: The housing is integrally formed by die casting. After cooling, the battery cell is fixed on the housing. Wires are connected by welding at the battery cell tabs and the external tabs of the housing. The drying box is produced by injection molding. After molding, a filter screen is made on the top surface of the drying box with a needle plate. The shaft is installed on the housing by hammering with a wooden mallet through a bearing. The drying box is rotatably installed inside the housing through the shaft. Finally, the side is encapsulated into a battery through a side sealing integrated machine. The positive electrode active material uses 811 high-nickel ternary material, which has a higher capacity than the previous lithium cobalt oxide material. The negative electrode uses high-capacity and high-compaction graphite, which has higher conductivity and oil absorption value than the ordinary graphite of previous batteries and has good thermal conductivity. Description of the Drawings

[0024] Figure 1Isometric view of the shell removal of a high-capacitance 400909 model battery according to an embodiment of the present invention,

[0025] Figure 2 Front cross-sectional view of a high-capacitance 400909 model battery in State 1 according to an embodiment of the present invention,

[0026] Figure 3 Front cross-sectional view of a high-capacitance 400909 model battery in State 2 according to an embodiment of the present invention,

[0027] Figure 4 Isometric view of a high-capacitance 400909 model battery according to an embodiment of the present invention,

[0028] Figure 5 Isometric view of the whistle mechanism of a high-capacitance 400909 model battery according to an embodiment of the present invention,

[0029] Figure 6 Front cross-sectional view of the whistle mechanism of a high-capacitance 400909 model battery according to an embodiment of the present invention. Specific implementation method

[0030] The reference signs in the accompanying drawings of the specification include: housing 1, external ear 2, housing heat dissipation port 3, drying box 5, air intake channel 6, air intake port 7, first cavity 8, second cavity 9, whistle 10, wire 11, ear protection sleeve 12, cell protection sleeve 13, internal heat dissipation port 14, rotating shaft 15, desiccant 16, cell 17, positive ear 18, negative ear 19, plug 20, thermal separator 21, propeller 22. The overall structure is divided into a housing cell part and a drying warning part.

[0031] The embodiment is basically as shown in the attached Figure 1 、 Figure 4 figures:

[0032] This solution provides a high-capacitance 400909 model battery, including a housing 1, an external ear 2, a cell 17, a negative ear 19, a positive ear 18, a cell protection sleeve 13, and an internal heat dissipation port 14. The overall housing 1 is an insulating box with a height of 20 mm, a length of 10 mm, and a width of 4.5 mm. The housing 1 is provided with a glass heat collection port and a baffle. The glass heat collection port is located in the upper right corner of the housing 1 and is matched with the position of the drying area. The baffle is located on both sides of the cell 17 to fix the cell 17. The cell 17 is located at the bottom of the housing 1. The positive ear 18 and the negative ear 19 are electrically connected to the external ear 2 through a wire 11. The external ear 2 is located at a height of 11 mm on the housing 1. The housing 1 and the baffle are both provided with heat dissipation ports, which are located at the lower part of the housing. The cell protection sleeve 13 is matched with the ear, and at the same time, the cell protection sleeve 13 is in interference fit on the cell 17.

[0033] As shown in the attached Figure 2 、 Figure 4 、Figure 5 , Figure 6 as shown in

[0034] This solution provides a high-capacitance 400909 model battery, including a drying box 5, an air intake channel 6, an air inlet 7, a first cavity 8, a second cavity 9, a whistle 10, a rotating shaft 15, a desiccant 16, a blocking block 20, a thermosensitive partition 21, a propeller 22, and an impact block 23. The top of the drying box 5 is equipped with a filter screen that can admit water mist, and the bottom is made of water-absorbing wood board.

[0035] The air intake channel 6 is located below the drying box 5 and the two are fixedly connected. There is an air outlet in the middle of the left end of the air intake channel 6. The right end of the air intake channel 6 is fixedly connected to a gas production box, and there is an air inlet 7 in the middle for connection. The gas production box is separated into a first cavity 8 and a second cavity 9 by the thermosensitive partition 21. There is an aluminum sulfate aqueous solution inside the first cavity 8, with a volume of one-third of that of the first cavity 8. There is a sodium bicarbonate aqueous solution inside the second cavity 9, with a volume of one-third of that of the container. The thermosensitive partition 21 is made of a low-melting-point pvc baffle, which will automatically melt when the temperature reaches above 70 degrees. The blocking block 20 is located at the air inlet 7 and is made of a wooden blocking block, which can be pushed open by air pressure when the air pressure is high. The rotating shaft 15 is located in the center of gravity of the drying box. There is a torsion spring on the rotating shaft 15, and the angle of the drying box under free swing is restricted so that it just cannot hit the shell. The desiccant 16 is made of high water-absorbing resin particles. The propeller 22 adopts a windmill structure and is formed by three groups of dragon blade coils around the middle shaft. The dragon blade and the whistle form a cavity. When the gas passes through, it will push the cavity to generate a rotating force, thereby driving the rotation of the propeller 22. The propeller 22 is fixedly connected to the whistle, so the whistle also rotates accordingly. The impact block 23 is made of copper material and makes a clear impact sound.

[0036] The preparation method of a high-capacitance 400909 type battery provided by this solution is as follows: The cathode material uses 811 high-nickel ternary material, which has a higher specific capacity (about 190 mAh / g). Therefore, under the premise of the same mass, the capacity exerted by the 811 high-nickel ternary material is higher. In this system, the proportion of high-nickel ternary is 97.2% - 97.8%, the high-molecular-weight binder PVDF (mainly refers to polyvinylidene fluoride homopolymer or copolymer of vinylidene fluoride and other small amounts of fluorinated vinyl monomers, with a semi-transparent or white powder or granular appearance, close arrangement between molecular chains, strong hydrogen bonds, oxygen index of 46%, non-flammable, crystallinity of 65% - 78%, density of 1.77 - 1.80 g / cm3, melting point of 172 °C, heat distortion temperature of 112 - 145 °C, long-term use temperature of -40 - 150 °C) accounts for 0.6% - 1.0%, and the conductive agent (pure black extremely fine powder. Apparent density 0.02 - 0.03 g / cm^3. Has high electrical conductivity and oil absorption value. Good thermal conductivity. The production method uses the calcium carbide method. That is, first use calcium carbide to make acetylene gas, after purification, pyrolyze the acetylene gas at about 1400 °C under an air-free condition, and then obtain it after cooling and collection) accounts for 1.2% - 1.8%. The above cathode material is formulated into a stable slurry through a dry / wet stirring process, the slurry viscosity is controlled at 4000 - 7000 mPa.S, and the slurry is evenly and stably coated on a 9 - 10 um current collector copper foil through a transfer / extrusion coater. After drying in an oven (temperature set within the range of 100 - 130 °C) to remove the solvent and moisture, it is roll-pressed to narrow the gaps between the particles, and the compaction can reach 3.4 - 3.7 g / cm3. It is cut into a coil with a width of 6.5 - 7.0 mm using an automatic slitting machine, and the coil is processed by an automatic tabbing machine for overwelding and taping to make a coil (the tab uses a white glue aluminum-to-nickel tab with a thickness of 0.08 - 0.10 mm, and the adhesive tape uses an insulating green glue with a thickness of 0.022 - 0.035 mm).

[0037] The negative electrode uses high-capacity and high-compaction graphite (a crystalline mineral of carbonaceous elements, whose crystal lattice is a hexagonal layered structure. The distance between each network layer is 340 pm, and the distance between carbon atoms in the same network layer is 142 pm. It belongs to the hexagonal crystal system and has complete layered cleavage. The cleavage plane is mainly composed of molecular bonds and has a weak attraction to molecules), accounting for 95.5% - 96.5%. The dispersant CMC (also known as sodium carboxymethyl cellulose, a cellulose derivative with a glucose polymerization degree of 100 - 2000 and a relative molecular mass of 242.16. It is a white fibrous or granular powder) accounts for 1.2% - 1.5%. The conductive agent (a pure black extremely fine powder. The apparent density is 0.02 - 0.03 g / cm^3. It has high electrical conductivity and oil absorption value. It has good thermal conductivity. The production method uses the calcium carbide method. That is, acetylene gas is first made from calcium carbide, purified, and then the acetylene gas is pyrolyzed at about 1400 °C under an air-free condition, and then cooled and collected) accounts for 0.5% - 1.0%. The binder (styrene-butadiene rubber (SBR), also known as polystyrene-butadiene copolymer. Its physical mechanical properties, processing properties, and the use properties of the product are close to those of natural rubber) accounts for 1.5% - 2.0%. The above-mentioned negative electrode material is formulated into a stable slurry through a dry / wet mixing process, and the slurry viscosity is controlled at 2000 - 4000 mPa.S. The slurry is evenly and stably coated on a 4.5 - 6 um current collector copper foil through a transfer type / extrusion type coater, dried in an oven (the temperature is set within the range of 80 - 110 °C) to remove moisture, and then roll-pressed. The compaction can reach 1.65 - 1.75 g / cm3. It is cut into a coil with a width of 6.5 - 7.0 mm using an automatic slitting machine. The coil is processed by an automatic tabbing machine for over-welding and taping to make a coil (the tab uses a white glue nickel tab with a thickness of 0.08 - 0.10 mm, and the adhesive tape uses an insulating green glue with a thickness of 0.022 - 0.035 mm).

[0038] After the positive and negative electrodes are made into coils, the coils are automatically wound into a core. The separator uses a ceramic separator with a thickness of (7 + 2) um. The aluminum-plastic film is formed using an aluminum-plastic film with a thickness of 0.088 - 0.113 mm, and a finished shell matching the core is formed by an automatic shell-forming machine. The qualified core made by the automatic winding machine is placed into the finished shell and encapsulated into a battery cell by a top-side sealing integrated machine. The sealing head uses a copper sealing head with a width of 0.9 - 1.3 mm, the sealing head temperature is 185 ± 5 °C, the encapsulation air pressure is 0.3 ± 0.1 Mpa, and the encapsulation time is 3 ± 0.2 S.

[0039] After encapsulation and flaring, the battery cell is placed in a high-vacuum oven for baking for 7 to 10 hours, with a vacuum degree of ≤ -92 Mpa. After baking, the battery cell is cooled to below 40 °C and quickly transferred into an automatic liquid injection machine for automatic liquid injection. The dew point in the liquid injection machine is ≤ -35 °C, the vacuum delay is 0.5 to 2.0 s, the sealing head temperature is 185 ± 5 °C, and the sealing air pressure is 0.3 ± 0.1 Mpa. After liquid injection and sealing, the battery cell is placed in an activation chamber at 50 ± 5 °C for activation for 12 to 24 hours. After activation, the battery cell is subjected to pressure formation for 80 to 100 minutes, and the voltage is charged to 4.05 to 4.10 V. The qualified voltage is screened out, and after being left for 4 hours, vacuum secondary sealing is carried out. The vacuum degree is ≤ -92 Mpa, the delayed vacuum is 3.0 to 5.0 s, the sealing temperature is 195 ± 5 °C, the pressure of the pressing plate is 0.2 to 0.5 Mpa, and the pressure of the sealing head is 0.3 ± 0.1 Mpa. After vacuum secondary sealing, the battery cell is subjected to cutting, folding, and ironing. The width of the folded edge is 3.2 to 3.6 mm, the ironing temperature is 145 ± 5 °C, and the ironing time is 2.0 ± 0.5 s. After ironing, the battery cell is automatically pasted with glue (the adhesive tape uses a brown high-temperature adhesive with a thickness of 0.035 mm and a width of 7 mm). The high-temperature adhesive is wound around the main body of the battery cell for one week. After pasting the glue, the battery cell is folded at the corners. After folding, it is ensured that the dimensions of the battery cell are all negative tolerances, that is, the thickness T ≤ 4.0 mm, the width W ≤ 9.0 mm, and the length L ≤ 9.0 mm.

[0040] The overall housing 1 is manufactured by a die-casting mold, and then the overall housing 1 is directly die-cast by an alloy using a die-casting machine. Then, the housing is wrapped with insulating plastic using a packaging machine, and the plastic at the external ear 2 is manually removed. The ears of the battery cell 17 and the external ear 2 of the housing are connected by welding wires. The drying box 5 is injection-molded using an injection molding machine. After molding, a filter screen is made on the top surface of the drying box using a needle plate, and then through holes are drilled using a drilling machine. The rotating shaft 15 is installed on the housing by hammering with a wooden mallet through a bearing. The drying box 5 is rotatably installed inside the housing through the rotating shaft 15. Finally, the side is encapsulated into a battery using a side-sealing integrated machine.

[0041] As shown in Figure 1 、 2 、3, 4:

[0042] The operator connects the positive and negative ears of the battery cell 17 to the external ear 2 through the wire 11. After connecting the circuit and normal use, when the user wears the earphone and swings normally, the impact block 23 cannot hit the housing 1. When water mist is generated inside, the water mist will enter the drying box 5 through the filter screen on the top surface of the drying box 5, and the internal water-absorbing resin particles will absorb and dry the water. And this battery cell is used for a Bluetooth earphone battery cell and often swings. Therefore, the surface water-absorbing resin that has absorbed the water mist will be shaken to the bottom, allowing the water-absorbing resin that has not absorbed the water mist to come to the surface to absorb the water, thus realizing the full utilization of the desiccant.

[0043] If the battery cell generates high temperature and is about to explode, the high temperature will cause the thermal-sensitive partition 21 to melt rapidly. Due to the melting of the thermal-sensitive partition 21, the solutions in the first cavity 8 and the second cavity 9 are mixed together. Through the chemical formula Al2(SO4)3 + 6NaHCO3 = 2Al(OH)3 / +6CO2 / +3NaSO4, a large amount of carbon dioxide is released, generating air pressure to push open the blocking block 20. The gas enters the intake passage 6 through the air inlet 7, and then quickly enters the whistle 10, emitting a harsh alarm sound. Since there is a propeller 22 in the whistle 10, the propeller 22 drives the whistle 10 to rotate through a rolling bearing. The reaction force of the gas coming out of the air flow outlet of the whistle 10 will drive the whistle 10 to swing significantly, so that the impact block impacts the housing 1, making a huge impact sound. The whistle sound and the impact sound remind the user to stay away from danger at the same time, preventing harm to the human body when the earphone explodes.

[0044] The above are only the embodiments of the present invention. Common knowledge such as the specific structures and characteristics known in the solutions is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. A high-capacity 400909 battery, comprising a battery cell and a shell, characterized in that: It also includes a drying device; the housing is provided with an external pole lug; The battery cell is fixedly connected to the housing, and the tab of the battery cell is electrically connected to the external tab; The drying device is located inside the shell, and includes a rotating shaft, a torsion spring, and a drying box. One end of the rotating shaft is fixedly connected to the shell, and the other end is rotatably connected to the drying box. The torsion spring is coaxially arranged with the rotating shaft, and one end of the torsion spring is fixedly connected to the shell, and the other end is fixedly connected to the drying box. A desiccant is arranged inside the drying box. It also includes an air intake channel, a whistle and a gas production box, the gas production box is fixedly connected to the drying box, a heat-sensitive plate is provided in the middle of the gas production box, the heat-sensitive plate divides the gas production box into a first cavity and a second cavity, an aluminum sulfate solution is provided inside the first cavity, and a baking soda solution is provided in the second cavity; the air intake channel is fixedly connected to the gas production box, the air outlet of the air intake channel is connected to the air inlet of the whistle, the air inlet of the air intake channel is connected to the first cavity, and a block is provided at the connection between the air inlet of the air intake channel and the first cavity; The whistle is rotatably connected to the first air outlet, a propeller is fixedly arranged inside the whistle, and the propeller is coaxially arranged with the air inlet of the whistle; an impact block that impacts the shell is fixedly arranged on the drying box.

2. A high-capacitance 400909 battery according to claim 1, characterized in that: The air outlet of the air inlet channel is rotatably connected to the rolling bearing at the air inlet of the whistle.

3. A high-capacitance 400909 battery according to claim 1, characterized in that: The shell is provided with a heat dissipation opening.

4. A high-capacitance 400909 battery according to claim 1, characterized in that: It also includes a battery cell protection cover, which is fixedly connected to the battery cell and matches the positive electrode ear and the negative electrode ear.

5. A method for preparing a high-capacitance 400909 battery as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: step S10: The positive electrode active material adopts 811 high-nickel ternary material, and the production method adopts the calcium carbide method. The raw pulp produced by the calcium carbide method is wrapped with copper foil and cut into coils by an automatic slitting machine. The coils are super-welded and glued by an automatic film making machine to make positive electrode coils; Step S20: The negative electrode uses high-gram capacity and high-density graphite, and the production method adopts the calcium carbide method. The raw slurry produced by the calcium carbide method is wrapped with copper foil and then cut into coils by an automatic slitting machine. The coils are super-welded and glued by an automatic film making machine to form negative electrode coils; Step S30: After the positive and negative electrodes are made, the coils are automatically wound into a core; a finished cell shell matching the core is formed by an automatic shell punching machine, and then the cell is packaged into a cell by a top and side sealing integrated machine; Step S40: The shell is formed in one piece by die casting, and the battery cell is fixed on the shell after cooling. The battery cell pole ear and the shell external pole ear are connected by welding. The drying box is produced by injection molding. After molding, a filter is made on the top surface of the drying box with a needle plate. The shell is installed with a shaft through a bearing by hammering with a wooden hammer. The drying box is installed inside the shell through the shaft. Finally, the side is packaged into a battery using a side sealing integrated machine.

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