A lithium battery and its production process

Abstract

This invention relates to the field of lithium battery technology, and more specifically to a lithium battery and its manufacturing process. The process includes the following steps: Step 1, electrode fabrication; Step 2, cell fabrication; Step 3, battery assembly. The detailed steps of the process are as follows: S1, material testing, and batching, coating, and slitting of the positive and negative electrodes, followed by baking; S2, assembly of the baked materials, followed by the preparation of aluminum foil using a preparation device and placing it on the inner surface of the casing, followed by welding of the assembled materials; S3, liquid injection, aging, formation, and capacity testing; S4, outer packaging and pack assembly line processing to complete the production of the lithium battery and its shipment. This manufacturing process can produce lithium batteries with aluminum foil, further improving the discharge performance of the lithium battery.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and more specifically to a lithium battery and a production process thereof. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. 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 mainstream. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium ion batteries do not contain metallic lithium and are rechargeable. Their safety, specific capacity, self-discharge rate, and performance-price ratio are all better than lithium ion batteries. However, existing lithium batteries do not have aluminum foil inside. The presence of aluminum foil improves the adhesion of the pole piece and reduces the amount of binder used. At the same time, the electrical performance of the battery is also significantly improved. Summary of the invention

[0003] The purpose of the present invention is to provide a lithium battery and a production process thereof. The production process can produce a lithium battery with aluminum foil, thereby further improving the discharge performance of the lithium battery.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A lithium battery production process, the process comprising the following steps:

[0006] Step 1: Pole production;

[0007] Step 2: Making the battery cell;

[0008] Step 3: Battery assembly.

[0009] The detailed steps of this process are:

[0010] S1. Test the materials, batch, coat and cut the positive and negative electrodes, and then bake them;

[0011] S2, assembling the baked materials, and then using a preparation device to prepare aluminum foil and placing it on the inner surface of the shell, and then welding the assembled materials;

[0012] S3, performing liquid injection, aging, formation and volume separation treatments;

[0013] S4: Carry out outer packaging Pack assembly line processing, complete the production of lithium batteries, and ship out.

[0014] Preferably, the preparation device includes a supporting frame and an adding T-tube fixedly connected to the supporting frame, a drainage pipe is fixedly connected to the adding T-tube, both ends of the adding T-tube and the drainage pipe are slidably connected with connecting curved pipes, the adding T-tube is connected to an adjustment component, and the adjustment component is connected to the two connecting curved pipes through threaded transmission.

[0015] Preferably, the adjustment component includes a bidirectional screw and two bearing seats. The bidirectional screw is rotatably connected to the added T-tube, and the two bearing seats are fixedly connected to the added T-tube. The two ends of the bidirectional screw are respectively rotatably connected to the two bearing seats, and the two connecting curved tubes are respectively connected to the two ends of the bidirectional screw through threaded transmission.

[0016] Preferably, the preparation device also includes two fixing bolts, a base frame, a mold cavity and an adjusting screw. The two fixing bolts are threadedly connected to the support frame, the base frame is threadedly connected to the two fixing bolts, the mold cavity is slidably connected to the base frame, the adjusting screw is rotatably connected to the base frame, and the mold cavity and the adjusting screw are connected by threaded transmission.

[0017] Preferably, the preparation device further comprises two sliding column groups and a separation plate, the two sliding column groups are fixedly connected to the mold cavity, the separation plate is slidably connected to the two sliding column groups, and the separation plate is slidably connected in the mold cavity.

[0018] Preferably, the preparation device also includes a supporting slide, a scraping slide and a lifting screw. The supporting slide is slidably connected to the two sliding column groups, the scraping slide is slidably connected to the supporting slide, the lifting screw is rotatably connected to the supporting slide, and the scraping slide is connected to the lifting screw via threaded transmission.

[0019] Preferably, the preparation device also includes a fixed arm plate, a stirring chamber and an addition tube, the fixed arm plate is fixedly connected to the support frame, the stirring chamber is fixedly connected to the fixed arm plate, the addition T-tube is slidably connected to the stirring chamber, and the addition tube is fixedly connected to the stirring chamber.

[0020] Preferably, the preparation device also includes a stepped column, a circular through hole, a worm wheel and a worm, the stepped column is rotatably connected in the stirring chamber, the circular through hole is arranged on the stepped column, the worm wheel is fixedly connected to the stepped column, the worm wheel is rotatably connected to the stirring chamber, and the worm wheel and the worm are meshingly connected.

[0021] Preferably, the lithium battery produced by the lithium battery production process has an inner wall of the lithium battery pasted with aluminum foil. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] Figure 1 It is a schematic diagram of a lithium battery and its production process of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of an embodiment of preparing aluminum foil;

[0025] Figure 3 It is a structural schematic diagram of an embodiment of controlling the falling of liquid aluminum;

[0026] Figure 4 It is a partial structural schematic diagram of an embodiment of controlling the falling of liquid aluminum;

[0027] Figure 5 It is a structural schematic diagram of an embodiment of performing abrasive tool processing on aluminum foil;

[0028] Figure 6 It is a structural schematic diagram of a partial cross-section of an embodiment of abrasive tool processing of aluminum foil;

[0029] Figure 7 It is a structural schematic diagram of the base frame and the adjusting screw of the present invention;

[0030] Figure 8 It is a structural schematic diagram of an embodiment of separating aluminum foil and adjusting the processing thickness of aluminum foil;

[0031] Fig. 9 This is a schematic structural diagram of an embodiment of heating and stirring liquid aluminum;

[0032] Fig.10 It is a schematic diagram of the cross-sectional structure of an embodiment of heating and stirring liquid aluminum. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] A lithium battery production process, the process comprising the following steps:

[0035] Step 1: Pole production;

[0036] Step 2: Making the battery cell;

[0037] Step 3: Battery assembly.

[0038] The following is combined with Figure 1 In detail, the lithium battery production process described above includes the following steps:

[0039] S1. Test the materials, batch, coat and cut the positive and negative electrodes, and then bake them;

[0040] S2, assembling the baked materials, and then using a preparation device to prepare aluminum foil and placing it on the inner surface of the shell, and then welding the assembled materials;

[0041] S3, performing liquid injection, aging, formation and volume separation treatments;

[0042] S4: Carry out outer packaging Pack assembly line processing, complete the production of lithium batteries, and ship out.

[0043] Furthermore, aluminum foil is also called pre-coating. In the lithium battery industry, it usually refers to a layer of conductive coating applied to the positive electrode current collector and the surface of the aluminum foil. The aluminum foil coated with the conductive coating is called pre-coated aluminum foil or simply coated aluminum foil. The conductive coating can effectively improve the adhesion of the electrode in the lithium battery, reduce the amount of binder used, and significantly improve the electrical performance of the battery.

[0044] The following is combined with Figure 2-5 In detail, the preparation device includes a supporting frame 101, an addition T-tube 102, a discharge pipe 103, two connecting curved pipes 104 and an adjusting member. The addition T-tube 102 is fixedly connected to the supporting frame 101 by multiple bolts, the discharge pipe 103 is fixedly connected to the addition T-tube 102 by welding with a connecting plate, the two connecting curved pipes 104 are respectively slidably connected to the two ends of the addition T-tube 102 and the discharge pipe 103, the adjusting member is connected to the addition T-tube 102, and the two connecting curved pipes 104 are connected to the adjusting member by threaded transmission.

[0045] Furthermore, the support bracket 101 plays a role of bearing support and can provide a fixed space for adding the T-tube 102. A circular convex plate is provided on the adding T-tube 102, and a plurality of fastening bolts are evenly connected with the circular convex plate through threads. The plurality of fastening bolts are connected to the support bracket 101 through threaded transmission. The support bracket 101 and the adding T-tube 102 are fixed by a plurality of fastening bolts, which is convenient for disassembly and replacement of the adding T-tube 102. Liquid aluminum can be added to the adding T-tube 102, and the drain pipe 103 plays a connecting role. A thin strip notch is provided at the bottom of the drain pipe 103, and thin strip notches are also provided at the bottom of the two connecting curved pipes 104. The thin strip notch on the drain pipe 103 and the two connecting curved pipes The thin strip notches on 104 are the same. When the liquid aluminum enters the adding T-tube 102, it will enter the drain pipe 103 through the two connecting curved pipes 104. Finally, the liquid aluminum will be discharged from the drain pipe 103 and the thin strip notches below the two connecting curved pipes 104, allowing the liquid aluminum to fall into the mold to achieve the processing of aluminum foil. The distance between the two connecting curved pipes 104 can be adjusted by adjusting the adjustment component. When the distance between the two connecting curved pipes 104 changes, the area covered by the two connecting curved pipes 104 and the drain pipe 103 will also be different. The distance between the two connecting curved pipes 104 can be changed according to the width of the mold, so that the distance between the two connecting curved pipes 104 is the same as the width of the mold, so that the liquid aluminum can be evenly spread into the mold.

[0046] According to the instruction manual Figure 2-4In detail, the adjustment component includes a bidirectional screw 201 and two bearing seats 202. The bidirectional screw 201 is rotatably connected to the added T-tube 102 through a circular hole. The two bearing seats 202 are fixedly connected to the added T-tube 102 by welding. The two ends of the bidirectional screw 201 are respectively rotatably connected to the two bearing seats 202 through bearings, and the two connecting curved tubes 104 are respectively connected to the two ends of the bidirectional screw 201 through threaded transmission.

[0047] Furthermore, the threads at both ends of the bidirectional lead screw 201 rotate in opposite directions. After rotating the bidirectional lead screw 201, the two connecting curved tubes 104 can be driven to move inward or outward at the same time. The two bearing seats 202 can provide rotation space for the two ends of the bidirectional lead screw 201, ensuring that the bidirectional lead screw 201 can rotate smoothly. According to the required width of the aluminum foil, the width of the mold located below the two connecting curved tubes 104 and a drainage pipe 103 will also be different. According to the width of the mold, rotating the bidirectional lead screw 201 can drive the two connecting curved tubes 104 to move inward or outward at the same time, thereby changing the distance between the two connecting curved tubes 104, ensuring that the liquid aluminum discharged from the thin strip notches below the drainage pipe 103 and the two connecting curved tubes 104 will fall evenly into the mold. When the liquid aluminum is evenly and flatly spread into the mold, the speed of the aluminum foil can be accelerated.

[0048] According to the instruction manual Figure 2 and 5 -7 is described in detail, the preparation device also includes two fixing bolts 301, a base frame 302, a mold cavity 303 and an adjusting screw 304, the two fixing bolts 301 are both connected to the support frame 101 by threads, the base frame 302 is connected to the two fixing bolts 301 by threads, the mold cavity 303 is connected to the base frame 302 by two cylindrical sliding connections, the adjusting screw 304 is rotatably connected to the base frame 302 through a bearing hole, and the mold cavity 303 and the adjusting screw 304 are connected by threaded transmission.

[0049] Furthermore, the support frame 101 and the base frame 302 can be fixedly connected together by using two fixing bolts 301. This has the advantage of facilitating the replacement of different base frames 302. Different base frames 302 can be replaced according to the width of the aluminum foil to be processed. Two horizontal sliding columns are fixedly connected to the base frame 302. The two horizontal sliding columns are slidably connected to the mold cavity 303. A heating plate is provided at the bottom of the mold cavity 303. After the liquid aluminum enters the mold cavity 303, the heating plate at the bottom of the mold cavity 303 can be started to heat the liquid aluminum and further accelerate the solidification of the liquid aluminum. The rotating adjustment screw 303 04 can drive the mold cavity 303 to slide, and the liquid aluminum discharged from the thin strip notches below the discharge pipe 103 and the two connecting curved pipes 104 falls evenly into the mold cavity 303. At this time, the mold cavity 303 can slide, so that the liquid aluminum can fall evenly into the mold cavity 303, which can speed up the laying speed of the liquid aluminum in the mold cavity 303, and further improve the processing speed of the aluminum foil. A reduction motor is fixedly connected to the base frame 302, and the output shaft of the reduction motor is fixedly connected to the adjusting screw 304. After starting the reduction motor, the adjusting screw 304 can be driven to rotate, and finally the mold cavity 303 is driven to slide.

[0050] According to the instruction manual Figure 5 , 6 As described in detail in FIG. 8 , the preparation device further includes two sliding column groups 401 and a separation plate 402 . The two sliding column groups 401 are fixedly connected to the mold cavity 303 by welding. The separation plate 402 is slidably connected to the two sliding column groups 401 , and the separation plate 402 is slidably connected in the mold cavity 303 .

[0051] Furthermore, the two sliding column groups 401 can provide sliding space for the separation plate 402, and realize the limiting processing of the separation plate 402, so that the separation plate 402 can only slide along the direction of the two sliding column groups 401, and the bottom of the separation plate 402 is thin enough. After the liquid aluminum is completely solidified in the mold cavity 303, the separation plate 402 can be slid. When the separation plate 402 slides, the solidified liquid aluminum can be separated from the mold cavity 303, so that the processed aluminum foil can be quickly taken out, which speeds up the removal of the aluminum foil. When the speed of aluminum foil preparation becomes faster, the unit price of the aluminum foil will also be reduced.

[0052] According to the instruction manual Figure 5 and 8 In detail, the preparation device also includes a supporting slide 403, a scraping slide 404 and a lifting screw 405. The supporting slide 403 is slidably connected to the two sliding column groups 401, the scraping slide 404 is slidably connected to the supporting slide 403 through two vertical columns, the lifting screw 405 is rotatably connected to the supporting slide 403 through a bearing hole, and the scraping slide 404 and the lifting screw 405 are connected by threaded transmission.

[0053] Furthermore, the supporting slide 403 can provide a sliding space for the scraping slide 404, and two lifting slides are arranged on the supporting slide 403, and the two lifting slides are provided with scales. According to the relative positions of the scales on the two lifting slides and the scraping slide 404, the height of the scraping slide 404 can be clearly known, and the rotating lifting screw 405 can drive the scraping slide 404 to rise and fall. The sliding of the scraping slide 404 can be used to scrape the liquid aluminum in the mold cavity 303, so as to process the aluminum foil of the required thickness. When there is too much liquid aluminum material in the mold cavity 303, it is necessary to use a water pump to extract the excess liquid aluminum in the mold cavity 303 to ensure that no excess liquid aluminum stays in the mold cavity 303, so as to process the aluminum foil of the required thickness.

[0054] According to the instruction manual Figure 2 , 5 , 9 and 10 illustrate in detail that the preparation device also includes a fixed arm plate 501, a stirring chamber 502 and an addition tube 503, the fixed arm plate 501 is fixedly connected to the support frame 101 by welding, the stirring chamber 502 is fixedly connected to the fixed arm plate 501 by welding, the addition T-tube 102 is slidably connected to the stirring chamber 502, and the addition tube 503 is fixedly connected to the stirring chamber 502 by welding.

[0055] Furthermore, the fixed arm plate 501 plays a role of bearing connection and can provide a fixed space for the stirring chamber 502. A heating component and a stirring component are provided in the stirring chamber 502. The heating component can be used to heat the liquid aluminum, and the stirring component is used to stir the aluminum to prevent the liquid aluminum entering the stirring chamber 502 from solidifying. The liquid aluminum can be added to the stirring chamber 502 through the adding tube 503, and then the heating component and the stirring component in the stirring chamber 502 are used to treat the liquid aluminum entering the stirring chamber 502 to ensure that the liquid aluminum does not solidify. A valve is provided at the bottom of the stirring chamber 502. When the valve at the bottom of the stirring chamber 502 is opened, the liquid aluminum will enter the adding T-tube 102 to realize the transfer of liquid aluminum, and a shielding cover is slidably connected to the top of the adding tube 503. The shielding cover can be used to shield the adding tube 503 to prevent debris from entering the stirring chamber 502 through the adding tube 503, further ensuring that there are no impurities in the liquid aluminum and improving the quality of the processed aluminum foil.

[0056] According to the instruction manual Fig. 9 and 10In detail, the preparation device also includes a step column 601, a circular through hole 602, a worm wheel 603 and a worm 604. The step column 601 is rotatably connected to the stirring chamber 502 through the circular hole. The circular through hole 602 is arranged on the step column 601. The worm wheel 603 is fixedly connected to the step column 601 by welding. The worm 604 is rotatably connected to the stirring chamber 502 through two bearing seats. The worm wheel 603 and the worm 604 are meshingly connected.

[0057] Furthermore, the stepped column 601 contacts the addition tube 503 to achieve a blocking treatment on the bottom of the addition tube 503. When the round through hole 602 is connected to the addition tube 503, the liquid aluminum in the addition tube 503 will enter the stirring chamber 502. When the round through hole 602 is in a horizontal state, the addition tube 503 can be blocked. At this time, the liquid aluminum in the addition tube 503 will not be able to enter the stirring chamber 502. The worm gear 603 can drive the stepped column 601 to rotate, thereby changing the angle of the round through hole 602. A pointer is provided on the worm gear 603. The angle of the round through hole 602 can be known by the angle indicated by the pointer, and the worm 604 can drive the worm gear 603 to rotate, thereby adjusting the angle of the round through hole 602 and changing the falling condition of the liquid aluminum.

Claims

1. A lithium battery production process, characterized in that: The process includes the following steps: Step 1: Pole production; Step 2: Making the battery cell; Step 3: Battery assembly; The detailed steps of the production process are: S1. Test the materials, batch, coat and cut the positive and negative electrodes, and then bake them; S2, assembling the baked materials, and then using a preparation device to prepare aluminum foil and placing it on the inner surface of the shell, and then welding the assembled materials; S3, performing liquid injection, aging, formation and volume separation treatments; S4, carry out outer packaging Pack assembly line processing, complete the production of lithium batteries, and ship out; A lithium battery production device is also used, the device comprising a support frame (101) and a T-tube (102) fixedly connected to the support frame (101), a liquid discharge pipe (103) fixedly connected to the T-tube (102), connecting curved pipes (104) slidably connected at both ends of the T-tube (102) and the liquid discharge pipe (103), the T-tube (102) being connected to an adjustment component, and the adjustment component being connected to the two connecting curved pipes (104) through threaded transmission; The adjustment component comprises a bidirectional lead screw (201) rotatably connected to the adding T-tube (102) and two bearing seats (202) fixedly connected to the adding T-tube (102), the two bearing seats (202) are both rotatably connected to the bidirectional lead screw (201), and the two ends of the bidirectional lead screw (201) are respectively connected to the two connecting curved tubes (104) through threaded transmission; The support frame (101) is connected to two fixing bolts (301) by threads, and the two fixing bolts (301) are connected to the base frame (302) by threads. The base frame (302) is slidably connected to a mold cavity (303), and the base frame (302) is rotatably connected to an adjustment screw (304), and the adjustment screw (304) is connected to the mold cavity (303) by threaded transmission. The mold cavity (303) is fixedly connected to two sliding column groups (401), the two sliding column groups (401) are slidably connected to a separation plate (402), and the separation plate (402) is slidably connected in the mold cavity (303); The two slide column groups (401) are slidably connected to a supporting slide plate (403), the supporting slide plate (403) is slidably connected to a scraping slide plate (404), the supporting slide plate (403) is rotatably connected to a lifting screw (405), and the lifting screw (405) is connected to the scraping slide plate (404) via a threaded transmission; The support frame (101) is fixedly connected to a fixed arm plate (501), the fixed arm plate (501) is fixedly connected to a stirring chamber (502), the stirring chamber (502) is slidably connected to the addition T-tube (102), and the stirring chamber (502) is fixedly connected to an addition tube (503); A stepped column (601) is rotatably connected in the stirring chamber (502), a round through hole (602) is provided on the stepped column (601), a worm wheel (603) is fixedly connected to the stepped column (601), a worm (604) is rotatably connected to the stirring chamber (502), and the worm (604) is meshingly connected to the worm wheel (603).

2. A lithium battery produced using the lithium battery production process according to claim 1, characterized in that: The inner wall of the lithium battery is pasted with aluminum foil.

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