Preparation method of all-tab battery, all-tab battery and preparation system of all-tab battery

Abstract

The embodiment of the invention discloses a preparation method of an all-tab battery, the all-tab battery and a preparation system of the all-tab battery, and the preparation method comprises the following steps: providing a positive plate and a negative plate which are all-tab plates; respectively carrying out die cutting treatment on the positive plate and the negative plate; carrying out winding treatment on the positive plate and the negative plate which are subjected to die cutting treatment to form a winding core; leveling the roll core, and welding the roll core with a convergence disc; the welded roll core is subjected to shell entering treatment, bottom welding treatment and channeling treatment; carrying out baking treatment on the roll core subjected to the channeling treatment; according to the scheme, the problems that the production efficiency is affected due to the fact that the arc edge of the foil area is large, the deviation correction displacement is too large, and a pole piece is broken can be solved, and therefore the production efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and particularly relates to a preparation method of a full-tab battery, a full-tab battery, and a preparation system of a full-tab battery. Background Art

[0002] Since the structure of a full-tab battery is completely different from that of a conventional multi-tab battery, empty foil areas are left at the edges of the positive electrode sheet and the negative electrode sheet of the full tab. Before winding, the empty foil areas are die-cut to serve as the positive tab and the negative tab of the battery. For a conventional multi-tab battery, the electrode sheet is directly baked and then wound. However, due to the influence of the electrode sheet structure after baking the full-tab electrode sheet, there is a large rebound in the material area of the electrode sheet, that is, the thickness of the electrode sheet increases. The rebound of the material area drives the foil area, resulting in large up and down fluctuations of the arc edge of the foil area. For such an electrode sheet with a large arc edge, the production efficiency will be seriously affected during the die-cutting process of the foil area, and further, the deviation correction displacement is too large, resulting in the breakage of the electrode sheet. Summary of the Invention

[0003] Embodiments of the present application provide a preparation method of a full-tab battery, a full-tab battery, and a preparation system of a full-tab battery, which can avoid the problem that the arc edge of the foil area is too large, thereby affecting the production efficiency, and further causing the deviation correction displacement to be too large and resulting in the breakage of the electrode sheet. Therefore, the production efficiency can be improved.

[0004] Embodiments of the present application provide a preparation method of a full-tab battery, including:

[0005] Providing a positive electrode sheet and a negative electrode sheet, wherein both the positive electrode sheet and the negative electrode sheet are full-tab electrode sheets;

[0006] Performing die-cutting treatment on the positive electrode sheet and the negative electrode sheet respectively;

[0007] Winding the die-cut positive electrode sheet and the negative electrode sheet to form a core;

[0008] Flattening the core and welding it to a current collector plate;

[0009] Performing casing treatment, bottom welding treatment, and grooving treatment on the welded core respectively;

[0010] Performing baking treatment on the grooved core;

[0011] Performing liquid injection treatment on the baked core to obtain a full-tab battery.

[0012] Optionally, in some embodiments of the present application, before providing the positive electrode sheet and the negative electrode sheet, the method further includes:

[0013] Providing a positive electrode sheet substrate, a negative electrode sheet substrate, positive electrode paste, and negative electrode paste;

[0014] Homogenize and stir the positive electrode paste and the negative electrode paste through a dispersion device;

[0015] Coat the homogenized and stirred positive electrode paste on the positive electrode sheet substrate through a coating device, and coat the homogenized and stirred negative electrode paste on the negative electrode sheet substrate;

[0016] Roll the coated positive electrode sheet substrate and the negative electrode sheet substrate through a rolling device;

[0017] Slit the rolled positive electrode sheet substrate and the negative electrode sheet substrate to obtain at least one positive electrode sheet and at least one negative electrode sheet;

[0018] Wherein, each positive electrode sheet includes a first coating area and a first blank foil area, one side of the first coating area connected to the first blank foil area has the same width dimension as the first coating area, each negative electrode sheet includes a second coating area and a second blank foil area, and one side of the second coating area connected to the second blank foil area has the same width dimension as the second coating area.

[0019] Optionally, in some embodiments of the present application, the separately die-cutting the positive electrode sheet and the negative electrode sheet includes:

[0020] Die-cut the first blank foil area of the positive electrode sheet through a die-cutting device to form a positive electrode tab;

[0021] Die-cut the second blank foil area of the negative electrode sheet through a die-cutting device to form a negative electrode tab.

[0022] Optionally, in some embodiments of the present application, the winding the die-cut positive electrode sheet and the negative electrode sheet to form a winding core includes:

[0023] Stack the die-cut positive electrode sheet, a preset separator, and the die-cut negative electrode sheet;

[0024] Wind the stacked positive electrode sheet, the preset separator, and the negative electrode sheet through a winding device to form the winding core, wherein the positive electrode tab and the negative electrode tab are respectively arranged on opposite sides of the winding core.

[0025] Optionally, in some embodiments of the present application, the flattening the winding core and welding it to a current collector plate includes:

[0026] Flatten the winding core through a flattening device;

[0027] Weld the positive electrode tab and the negative electrode tab of the winding core to the current collector plate respectively.

[0028] Optionally, in some embodiments of the present application, the steps of subjecting the wound core after welding to housing insertion treatment, bottom welding treatment, and grooving treatment respectively include:

[0029] Providing a battery housing;

[0030] Inserting the wound core after welding into the battery housing, and welding the bottom of the wound core to the bottom of the battery housing;

[0031] Performing the grooving treatment on the battery housing after welding through a grooving device to form a groove.

[0032] Optionally, in some embodiments of the present application, the steps of performing liquid injection treatment on the wound core after baking treatment to obtain a full-tab battery include:

[0033] Injecting electrolyte into the wound core through a liquid injection device and allowing it to stand still to enable the electrolyte to infiltrate the wound core;

[0034] Performing formation treatment, grading treatment, and aging treatment on the wound core after standing still to obtain the full-tab battery.

[0035] Optionally, in some embodiments of the present application, before performing the liquid injection treatment on the wound core after baking treatment, the method further includes:

[0036] Allowing the wound core after baking treatment to stand still until the wound core reaches a preset temperature;

[0037] Measuring the moisture data of the wound core after standing still;

[0038] If the moisture data is less than a preset moisture threshold, it is determined that the moisture of the wound core meets the requirements.

[0039] Correspondingly, the present application further provides a full-tab battery, which is prepared by the preparation method of any one of the above-mentioned full-tab batteries.

[0040] The present application further provides a computer-readable storage medium, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the preparation method of any one of the above-mentioned full-tab batteries are implemented.

[0041] The embodiments of the present application provide a preparation method of a full-tab battery, a full-tab battery, and a preparation system of a full-tab battery. After providing a positive electrode sheet and a negative electrode sheet, wherein both the positive electrode sheet and the negative electrode sheet are full-tab electrode sheets; respectively perform die-cutting on the positive electrode sheet and the negative electrode sheet, then wind the die-cut positive electrode sheet and the negative electrode sheet to form a core, and then perform a flattening process on the core and weld it to a bus bar. Immediately afterwards, perform a housing process, a bottom welding process, and a grooving process on the welded core respectively. Then, perform a baking process on the grooved core, and finally, perform a liquid injection process on the baked core to obtain a full-tab battery. In the full-tab battery preparation solution provided by the present application, baking is performed after winding. The electrode sheets are not baked during die-cutting and winding, thus avoiding problems such as increased thickness and arc-shaped edges caused by baking; moreover, the diameter of the core will not increase due to baking, making it easier to insert into the housing; it is possible to avoid the problem that the arc edges in the foil area are too large, which affects production efficiency, and further leads to excessive deviation correction displacement and breakage of the electrode sheet. Therefore, production efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0043] Figure 1 is a schematic flow chart of the preparation method of the full-tab battery provided by the embodiments of the present application;

[0044] Figure 2 is a schematic structural diagram of an electronic device provided by the embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0046] The embodiments of the present application provide a preparation method of a full-tab battery, a full-tab battery, and a preparation system of a full-tab battery.

[0047] The following will be described in detail respectively. It should be noted that the description order of the following embodiments does not limit the priority order of the embodiments.

[0048] A method for preparing an all-tab battery, comprising: providing a positive electrode sheet and a negative electrode sheet; performing die-cutting on the positive electrode sheet and the negative electrode sheet respectively; winding the die-cut positive electrode sheet and negative electrode sheet to form a core; flattening the core and welding it to a bus bar; subjecting the welded core to housing, bottom welding, and grooving processes respectively; baking the grooved core; and injecting electrolyte into the baked core to obtain an all-tab battery.

[0049] Please refer to Figure 1 , Figure 1 which is a schematic flow chart of the method for preparing an all-tab battery provided by an embodiment of the present application. The specific process of the method for preparing an all-tab battery can be as follows:

[0050] 101. Provide a positive electrode sheet and a negative electrode sheet.

[0051] Among them, both the positive electrode sheet and the negative electrode sheet are all-tab electrode sheets. The all-tab electrode sheet is a new type of battery electrode sheet design, in which the entire edge area of the electrode sheet is designed as a tab. Compared with the traditional multi-tab or single-tab design, the number of tabs of the all-tab electrode sheet is much larger than that of the traditional electrode sheet, almost covering the entire edge area of the electrode sheet. This design can significantly reduce the internal resistance of the battery, improve the rate performance and heat dissipation performance of the battery. The positive electrode sheet is one of the key components of a lithium-ion battery, mainly responsible for storing and releasing lithium ions during the charge and discharge process of the battery; the negative electrode sheet is one of the key components of a lithium-ion battery, responsible for storing and releasing lithium ions during the charge and discharge process of the battery. The performance of the negative electrode sheet directly affects the energy density, rate performance, cycle life, and safety of the battery.

[0052] In some embodiments of the present application, before the step of "providing a positive electrode sheet and a negative electrode sheet", it may specifically further include:

[0053] Providing a positive electrode sheet substrate, a negative electrode sheet substrate, a positive electrode paste, and a negative electrode paste;

[0054] Homogenizing and stirring the positive electrode paste and the negative electrode paste through a dispersion device;

[0055] Coating the homogenized and stirred positive electrode paste on the positive electrode sheet substrate, and coating the homogenized and stirred negative electrode paste on the negative electrode sheet substrate through a coating device;

[0056] Rolling the coated positive electrode sheet substrate and the negative electrode sheet substrate through a rolling device;

[0057] Performing slitting on the rolled positive electrode sheet substrate and negative electrode sheet substrate to obtain at least one positive electrode sheet and at least one negative electrode sheet;

[0058] Among them, each positive electrode sheet includes a first coating area and a first empty foil area. One side of the first coating area connected to the first empty foil area has the same width dimension as the first coating area. Each negative electrode sheet includes a second coating area and a second empty foil area. One side of the second coating area connected to the second empty foil area has the same width dimension as the second coating area.

[0059] The positive electrode sheet substrate is an important component of the lithium-ion battery positive electrode sheet and is usually made of aluminum foil. Its main function is to act as a current collector to collect and conduct current, and at the same time provide support for the positive electrode active material. The performance of the positive electrode sheet substrate directly affects the conductivity, mechanical stability and overall performance of the battery. Aluminum foil can be selected as the positive electrode sheet substrate. The negative electrode sheet substrate is an important component of the lithium-ion battery negative electrode sheet and is usually made of copper foil. Its main function is to act as a current collector to collect and conduct current, and at the same time provide support for the negative electrode active material. The performance of the negative electrode sheet substrate directly affects the conductivity, mechanical stability and overall performance of the battery. Copper foil can be selected as the positive electrode sheet substrate. The positive electrode slurry is a key material in the manufacturing process of the lithium-ion battery positive electrode sheet and is formed by mixing positive electrode active materials, conductive agents, binders and solvents. Its main function is to evenly distribute the positive electrode active materials on the current collector to form a positive electrode sheet with good conductivity and mechanical stability. The positive electrode slurry is formed by mixing positive electrode active materials (such as lithium cobaltate, lithium nickel cobalt manganate, etc.), conductive agents (such as carbon black, graphene, etc.) and binders (such as PVDF). The negative electrode slurry is a key material in the manufacturing process of the lithium-ion battery negative electrode sheet, and its performance directly affects the energy density, rate performance, cycle life and safety of the battery. The negative electrode slurry is formed by mixing negative electrode active materials (such as graphite, silicon-carbon composite materials, etc.), conductive agents (such as carbon black, carbon nanotubes, etc.) and binders (such as PVDF, SBR).

[0060] Among them, the dispersion device can be a high-speed disperser, a grinder or an ultrasonic disperser, and can be specifically selected according to the actual situation. The coating device can be a knife coater, a roll coater or a slot coater, and is specifically selected according to the actual situation.

[0061] Specifically, the positive electrode active material, conductive agent, and binder are mixed in proportion, and an appropriate amount of solvent is added and stirred evenly initially. According to the viscosity and component characteristics of the slurry, a suitable stirring speed is selected. For example, the stirring speed of the positive electrode slurry is 1000 - 2000 revolutions per minute, and the stirring speed of the negative electrode slurry is 800 - 1500 revolutions per minute. At the same time, according to the uniformity requirements of the slurry, a suitable stirring time is determined. For example, the stirring time of the positive electrode slurry is 30 - 60 minutes, and the stirring time of the negative electrode slurry is 20 - 40 minutes. During the stirring process, the temperature of the slurry is controlled at 20 - 30 degrees Celsius to avoid solvent evaporation or component property changes caused by excessive temperature. During the coating process, according to the coating thickness and slurry viscosity, the coating speed is adjusted to ensure a uniform coating. By adjusting the parameters of the coating device (such as the doctor blade gap, coating roller pressure, etc.), the coating thickness is controlled. During the rolling process, according to the thickness and density requirements of the electrode sheet, the pressure of the rolling roller is adjusted. For example, the pressure of the rolling roller for the positive electrode sheet is 10 - 20 MPa, and the pressure of the rolling roller for the negative electrode sheet is 8 - 15 MPa. At the same time, according to the density and mechanical strength requirements of the electrode sheet, the speed of the rolling roller is adjusted. For example, the speed of the rolling roller is 1 - 3 m / min.

[0062] The area on the positive electrode sheet in the first coating area where the positive electrode slurry is coated is used to store and release lithium ions. The first empty foil area is the area on the positive electrode sheet where no slurry is coated and is used to form the tab. The tab is a key part for collecting and conducting the battery current. The second coating area is the area on the negative electrode sheet where the negative electrode slurry is coated and is used to store and release lithium ions. The second empty foil area is the area on the negative electrode sheet where no slurry is coated and is used to form the tab. The tab is a key part for collecting and conducting the battery current. By designing the first empty foil area and the second empty foil area to ensure that the width of the tab is consistent with the width of the coating area, the current collection efficiency can be improved and the loss of current during conduction can be reduced.

[0063] 102. The positive electrode sheet and the negative electrode sheet are respectively subjected to die-cutting treatment.

[0064] Die-cutting treatment is a key step in the manufacturing process of lithium-ion batteries and is used to form tabs in the empty foil areas of the positive electrode sheet and the negative electrode sheet. Specifically, the coated electrode sheet substrate is placed on the workbench of the die-cutting machine to ensure the accurate position of the empty foil area. Then, a positioning device (such as a fixture or vacuum adsorption) is used to fix the electrode sheet to ensure that it does not move during the die-cutting process. Finally, the die-cutting machine is started, and the empty foil area is die-cut with a die to form tabs.

[0065] Optionally, in some embodiments of the present application, the step of "respectively subjecting the positive electrode sheet and the negative electrode sheet to die-cutting treatment" may specifically include:

[0066] The first empty foil area of the positive electrode sheet is die-cut through a die-cutting device to form a positive tab;

[0067] The second empty foil area of the negative electrode sheet is die-cut by a die-cutting device to form a negative electrode tab.

[0068] For example, specifically, place the coated positive electrode sheet substrate on the workbench of the die-cutting machine to ensure the accurate position of the first empty foil area. Use a positioning device (such as a fixture or vacuum adsorption) to fix the positive electrode sheet to ensure that it does not move during the die-cutting process. Start the die-cutting machine and use a die to perform die-cutting on the first empty foil area to form a positive electrode tab. Ensure that the pressure and speed parameters during die-cutting are appropriate to avoid damage to the electrode sheet or incomplete die-cutting. After die-cutting is completed, check the shape and size of the positive electrode tab to ensure that it meets the design requirements.

[0069] Similarly, place the coated negative electrode sheet substrate on the workbench of the die-cutting machine to ensure the accurate position of the second empty foil area. Use a positioning device (such as a fixture or vacuum adsorption) to fix the negative electrode sheet to ensure that it does not move during the die-cutting process. Start the die-cutting machine and use a die to perform die-cutting on the second empty foil area to form a negative electrode tab. Ensure that the pressure and speed parameters during die-cutting are appropriate to avoid damage to the electrode sheet or incomplete die-cutting. After die-cutting is completed, check the shape and size of the negative electrode tab to ensure that it meets the design requirements.

[0070] 103. Wind the die-cut positive electrode sheet and negative electrode sheet to form a core.

[0071] The winding process is a key step in the manufacturing process of lithium-ion batteries, used to wind the die-cut positive electrode sheet and negative electrode sheet into a core. Usually, a winding machine is used to wind the die-cut positive electrode sheet and negative electrode sheet into a core. The winding machine can include an automatic winding machine and a semi-automatic winding machine.

[0072] Specifically, place the positive electrode sheet, negative electrode sheet, and separator on the workbench of the winding machine in sequence to ensure their accurate positions. Use a positioning device (such as a fixture or vacuum adsorption) to fix the electrode sheets and the separator to ensure that they do not move during the winding process. Start the winding machine and start the winding process. During the winding process, ensure that the positive electrode sheet, separator, and negative electrode sheet are wound in sequence to form a core.

[0073] In some embodiments of the present application, the step of "winding the die-cut positive electrode sheet and negative electrode sheet to form a core" may specifically include:

[0074] Stack the die-cut positive electrode sheet, a preset separator, and the die-cut negative electrode sheet;

[0075] Perform the winding process on the stacked positive electrode sheet, preset separator, and negative electrode sheet through a winding device to form a core.

[0076] Among them, the positive electrode tab and the negative electrode tab are respectively arranged on opposite sides of the wound core. The positive electrode tab and the negative electrode tab being respectively arranged on opposite sides of the wound core can effectively avoid direct contact between the positive and negative electrode tabs, thereby reducing the risk of internal short circuit. Specifically, place the positive electrode sheet, the preset separator, and the negative electrode sheet on the workbench of the winding machine in sequence, ensuring their accurate positions. Use a positioning device (such as a fixture or vacuum adsorption) to fix the electrode sheets and the separator, ensuring that they do not move during the winding process. Ensure the accurate positions of the positive electrode sheet, the separator, and the negative electrode sheet on the winding machine to avoid winding position deviation caused by inaccurate positioning. Specifically, a high-precision positioning device, such as a fixture or vacuum adsorption, can be used to ensure that the electrode sheets and the separator do not move during the winding process. During the winding process, ensure that the positive electrode sheet, the separator, and the negative electrode sheet are wound in sequence to form a wound core.

[0077] 104. Flatten the wound core and weld it to the bus bar.

[0078] The purpose of the flattening process is to ensure the flatness and tightness of the wound core, reduce the deformation and displacement of the wound core in subsequent processes, and improve the mechanical stability and consistency of the battery. The purpose of welding the wound core to the bus bar is to ensure that current can effectively conduct from the wound core to the external circuit of the battery, improving the conductivity and reliability of the battery.

[0079] For example, specifically, place the wound core on the workbench of the flattening device, ensuring the accurate position of the wound core and the correct direction of the electrode tabs. Then, start the flattening device and apply uniform pressure to the wound core to ensure the flatness and tightness of the wound core. Place the flattened wound core on the workbench of the welding equipment, ensuring the accurate position of the wound core and the correct direction of the electrode tabs. Then, place the bus bar at the position of the electrode tabs of the wound core, ensuring good contact between the bus bar and the electrode tabs. Start the welding equipment and perform welding treatment on the electrode tabs of the wound core and the bus bar.

[0080] In some embodiments of the present application, the step of "flatten the wound core and weld it to the bus bar" may specifically include:

[0081] Flatten the wound core through a flattening device;

[0082] Weld the positive electrode tab and the negative electrode tab of the wound core to the bus bar respectively.

[0083] The flattening process can ensure the flatness and tightness of the wound core, reducing the deformation and displacement of the wound core in subsequent processes. During the welding process, the flatness and tightness of the wound core can reduce the deformation caused by mechanical stress, improve the mechanical stability of the wound core, and thus improve the overall structural stability of the battery.

[0084] 105. Perform case insertion treatment, bottom welding treatment, and grooving treatment on the welded wound core respectively.

[0085] The purpose of the shelling process is to place the wound core after welding into the battery shell. The purpose of the bottom welding process is to weld the bottom of the wound core to the battery shell to ensure the fixation and sealing of the wound core in the shell. The purpose of the grooving process is to form a groove on the top of the battery shell to prepare for the subsequent sealing process and ensure the sealing and mechanical strength of the battery.

[0086] For example, specifically, place the wound core into the battery shell to ensure good alignment between the wound core and the shell. After the shelling is completed, check the position of the wound core in the shell to ensure it meets the design requirements. Place the wound core after shelling on the workbench of the welding equipment to ensure the accurate position of the wound core and the correct direction of the tab. Start the welding equipment to weld the bottom of the wound core to the battery shell. After placing the wound core after bottom welding on the workbench of the grooving equipment, start the grooving equipment to groove the top of the battery shell.

[0087] Optionally, in some embodiments of the present application, the step of "performing shelling treatment, bottom welding treatment, and grooving treatment on the wound core after welding" may specifically include:

[0088] Provide a battery shell;

[0089] Load the wound core after welding into the battery shell and weld the bottom of the wound core to the bottom of the battery shell;

[0090] Perform grooving treatment on the welded battery shell through a grooving device to form a groove.

[0091] For example, specifically, place the wound core after welding in the battery shell to ensure the accurate position of the wound core and the correct direction of the tab. Place the wound core into the battery shell and adjust its position to ensure its position in the shell meets the design requirements. Then, place the wound core loaded into the shell on the workbench of the welding equipment and start the welding equipment to weld the bottom of the wound core to the bottom of the battery shell. Next, start the grooving equipment to groove the top of the battery shell to form a groove.

[0092] 106. Bake the wound core after grooving treatment.

[0093] The baking treatment is a key step in the manufacturing process of lithium-ion batteries, mainly used to remove moisture in the wound core.

[0094] For example, specifically, set the temperature and time of the baking equipment according to the material and design requirements of the wound core. For example, the baking temperature is 80 - 120 degrees Celsius and the baking time is 2 - 4 hours. Then, start the baking equipment to start the baking treatment. After baking is completed, check the dryness of the wound core to ensure that its moisture content meets the design requirements.

[0095] 107. Perform liquid injection treatment on the baked core to obtain a full-tab battery.

[0096] For example, place the baked core on the workbench of the liquid injection device, and then, according to the material and design requirements of the core, set the liquid injection volume and liquid injection speed of the liquid injection device. Optionally, the liquid injection volume is 0.5 - 2.0 g, and the liquid injection speed is 0.1 - 0.5 g / s. Then, start the liquid injection device to start the liquid injection treatment. During the liquid injection process, monitor the liquid injection volume and liquid injection speed in real time to ensure that the liquid injection volume and liquid injection speed meet the set requirements. After the liquid injection is completed, check the liquid injection effect of the core to ensure that the electrolyte is evenly distributed throughout the core.

[0097] In some embodiments of the present application, the step of "performing liquid injection treatment on the baked core to obtain a full-tab battery" may specifically include:

[0098] Inject the electrolyte into the core through a liquid injection device and let it stand still to allow the electrolyte to infiltrate the core;

[0099] Perform formation treatment, grading treatment, and aging treatment on the standing core to obtain a full-tab battery.

[0100] For example, specifically, place the liquid-injected core on a standing rack, and then, according to the material and design requirements of the core, set the standing time. For example, the standing time is 2 - 24 hours. After the standing is completed, check the infiltration effect of the core to ensure that the electrolyte is evenly distributed throughout the core. Place the standing core on the workbench of the formation device, then start the formation device to start the formation treatment, and monitor the charging current and voltage in real time to ensure a stable formation process. After the formation is completed, check the formation effect of the core to ensure that the formed Solid Electrolyte Interface (SEI) film is well formed. Then, after placing the graded core on the workbench of the aging device, start the aging device to start the aging treatment, thereby obtaining a full-tab battery.

[0101] Optionally, in some embodiments of the present application, before the step of "performing liquid injection treatment on the baked core", it may specifically include:

[0102] Let the baked core stand still until the core reaches a preset temperature;

[0103] Measure the moisture data of the standing core;

[0104] If the moisture data is less than the preset moisture threshold, it is determined that the moisture of the core meets the requirements.

[0105] The purpose of the static treatment is to allow the core to reach a preset temperature after baking, ensuring a uniform temperature distribution inside the core. During the static process, the moisture inside the core will gradually balance, which helps with subsequent moisture measurement.

[0106] According to the design requirements of the battery, a preset moisture threshold is set. For example, the preset moisture threshold is 0.1%.

[0107] Compare the measured moisture data with the preset moisture threshold. If the moisture data is less than the preset moisture threshold, it is determined that the moisture of the core meets the requirements. If the moisture data is greater than the preset moisture threshold, the core needs to be baked again until the moisture content meets the requirements. The core after re-baking needs to be static and have its moisture measured again to ensure that its moisture content meets the requirements.

[0108] The above is the preparation process of the all-pole-ear battery provided by the embodiments of this application.

[0109] In the embodiments of this application, after providing the positive electrode sheet and the negative electrode sheet, where both the positive electrode sheet and the negative electrode sheet are all-pole-ear electrode sheets; the positive electrode sheet and the negative electrode sheet are respectively subjected to die-cutting treatment, then, the die-cut positive electrode sheet and negative electrode sheet are wound to form a core, then, the core is flattened and welded to the bus bar, immediately afterwards, the welded core is respectively subjected to casing treatment, bottom welding treatment and grooving treatment, then, the grooved core is baked, and finally, the baked core is subjected to liquid injection treatment to obtain an all-pole-ear battery. In the all-pole-ear battery preparation scheme provided by this application, baking is carried out after winding, and the electrode sheets are not baked during die-cutting and winding, thus avoiding problems such as increased thickness and arc-shaped edges caused by baking; moreover, the diameter of the core will not increase due to baking, making it easier to insert into the casing; it is possible to avoid the problem that the arc edge of the foil area is too large, which affects production efficiency, and further causes the deviation correction displacement to be too large, resulting in the problem of electrode sheet breakage. Therefore, production efficiency can be improved.

[0110] The embodiments of this application also provide an all-pole-ear battery, which is prepared by the preparation method of the all-pole-ear battery in any of the above embodiments.

[0111] In addition, the embodiments of this application also provide an all-pole-ear battery preparation system, as Figure 2 shown, which shows the structural schematic diagram of the all-pole-ear battery preparation system involved in the embodiments of this application. Specifically:

[0112] This preparation system includes a die-cutting device 201, a winding device 202, a flattening device 203, a welding device 204, a casing device 205, a welding device 206, a grooving device 207, a baking device 208 and a liquid injection device 209. This preparation system realizes various functions as follows:

[0113] Provide a positive electrode sheet and a negative electrode sheet; perform die-cutting on the positive electrode sheet and the negative electrode sheet respectively; wind the die-cut positive electrode sheet and negative electrode sheet to form a core; flatten the core and weld it to a current collector plate; perform housing insertion, bottom welding, and grooving on the welded core respectively; bake the grooved core; perform liquid injection on the baked core to obtain a full-tab battery.

[0114] For the specific implementation of each of the above operations, reference can be made to the previous embodiments, which will not be elaborated here.

[0115] After providing the positive electrode sheet and the negative electrode sheet in the embodiment of the present application, the positive electrode sheet and the negative electrode sheet are both full-tab electrode sheets; perform die-cutting on the positive electrode sheet and the negative electrode sheet respectively. Then, wind the die-cut positive electrode sheet and negative electrode sheet to form a core. Next, flatten the core and weld it to a current collector plate. Immediately afterwards, perform housing insertion, bottom welding, and grooving on the welded core respectively. Then, bake the grooved core. Finally, perform liquid injection on the baked core to obtain a full-tab battery. In the full-tab battery preparation solution provided by the present application, baking is performed after winding. The electrode sheets are not baked during die-cutting and winding, thus avoiding problems such as increased thickness and arc-shaped edges caused by baking; moreover, the core diameter will not increase due to baking, making it easier to insert into the housing; it is possible to avoid a large arc edge in the foil area, which affects production efficiency, and further avoid the problem of excessive deviation correction displacement resulting in electrode sheet breakage. Therefore, production efficiency can be improved.

[0116] The above has introduced in detail a method for preparing a full-tab battery, a full-tab battery, and a preparation system for a full-tab battery provided by the embodiments of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, based on the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A method for preparing a full-tab battery, characterized in that: include: Providing a positive electrode sheet and a negative electrode sheet, wherein both the positive electrode sheet and the negative electrode sheet are full-ear electrode sheets; Performing die-cutting processing on the positive electrode sheet and the negative electrode sheet respectively; Winding the die-cut positive electrode sheet and the negative electrode sheet to form a winding core; The winding core is flattened and welded to the busbar; The welded coil core is subjected to shelling, bottom welding and groove rolling respectively; performing a baking process on the roll core after the groove rolling process; The rolled core after the baking process is injected with liquid to obtain a full-tab battery.

2. The method for preparing a full-tab battery according to claim 1, characterized in that: Before providing the positive electrode sheet and the negative electrode sheet, the method further includes: Providing positive electrode substrate, negative electrode substrate, positive electrode slurry and negative electrode slurry; Homogenizing and stirring the positive electrode slurry and the negative electrode slurry by a dispersing device; The positive electrode slurry after homogenization and stirring is applied on the positive electrode sheet substrate by a coating device, and the negative electrode slurry after homogenization and stirring is applied on the negative electrode sheet substrate; Performing a rolling process on the coated positive electrode sheet substrate and the negative electrode sheet substrate by a rolling device; Cutting the positive electrode sheet substrate and the negative electrode sheet substrate after the rolling process to obtain at least one positive electrode sheet and at least one negative electrode sheet; Each of the positive electrode sheets comprises a first coated area and a first empty foil area, and a side of the first coated area connected to the first empty foil area has the same width as the first coated area; each of the negative electrode sheets comprises a second coated area and a second empty foil area, and a side of the second coated area connected to the second empty foil area has the same width as the second coated area.

3. The method for preparing a full-tab battery according to claim 2, characterized in that: The die-cutting process is performed on the positive electrode sheet and the negative electrode sheet respectively, comprising: Die-cutting the first empty foil area of ​​the positive electrode sheet by a die-cutting device to form a positive electrode ear; The second empty foil area of ​​the negative electrode sheet is die-cut by a die-cutting device to form a negative electrode ear.

4. The method for preparing a full-tab battery according to claim 3, characterized in that: The step of winding the die-cut positive electrode sheet and the negative electrode sheet to form a winding core comprises: The die-cut positive electrode sheet, the preset separator and the die-cut negative electrode sheet are stacked; The stacked positive electrode sheet, the preset separator and the negative electrode sheet are wound by a winding device to form the winding core, wherein the positive electrode tab and the negative electrode tab are respectively arranged on opposite sides of the winding core.

5. The method for preparing a full-tab battery according to claim 4, characterized in that: The flattening of the winding core and welding with the busbar comprises: The winding core is flattened by a flattening device; The positive electrode tab and the negative electrode tab of the winding core are welded to the busbar respectively.

6. The method for preparing a full-tab battery according to claim 5, characterized in that: The coil core after welding is subjected to shelling, bottom welding and groove rolling respectively, including: Providing a battery housing; Installing the welded winding core into the battery shell, and welding the bottom of the winding core to the bottom of the battery shell; The battery casing after welding is subjected to the groove rolling process by a groove rolling device to form a groove.

7. The method for preparing a full-tab battery according to claim 6, characterized in that: The step of injecting liquid into the baked core to obtain a full-tab battery comprises: Injecting electrolyte into the winding core through a liquid injection device and leaving the winding core to stand, so that the electrolyte infiltrates the winding core; The winding core after standing is subjected to formation treatment, capacity separation treatment and aging treatment to obtain the full-tab battery.

8. The method for preparing a full-tab battery according to claim 1, characterized in that: Before the liquid injection process is performed on the roll core after the baking process, the method further comprises: Allowing the baked roll core to stand until the roll core reaches a preset temperature; measuring the moisture data of the roll core after standing; If the moisture data is less than a preset moisture threshold, it is determined that the moisture of the roll core meets the requirement.

9. A full-tab battery, characterized in that: The full-tab battery is prepared by the preparation method of the full-tab battery according to any one of claims 1 to 8.

10. A system for preparing a full-tab battery, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method for preparing a full-tab battery as described in any one of claims 1 to 8 are implemented.

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