Cold pressing equipment and battery production line

Abstract

The utility model relates to the technical field of battery manufacturing, and provides cold pressing equipment and a battery production line. The cold pressing equipment comprises a pole piece conveying system which comprises an unwinding mechanism, a first traction mechanism, a first tension adjusting mechanism, a first pinch roll and a cold pressing mechanism which are sequentially arranged in the pole piece belt conveying direction; and the heating mechanism is arranged between the first traction mechanism and the first tension adjusting mechanism, and the heating mechanism is used for heating the tab area of the pole piece so as to adjust the elongation rate of the tab area. According to the technical scheme, the conditions of cold pressing belt breakage and poor tab extension caused by insufficient elongation of the tab area of the pole piece can be improved, so that the production efficiency and the production quality of the pole piece can be improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a cold pressing device and a battery production line. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Currently, in the battery production process, electrodes need to be manufactured through a cold pressing process. After coating, the current collector needs to be pressed by cold pressing rollers to achieve the standard compaction of the electrode, and then tensioned by pinch rollers to achieve the required tabs. This process places high demands on the tab extension of the current collector. Poorly extended current collectors will frequently experience strip breakage or poor tab extension during manufacturing, seriously affecting the production capacity of cold-pressed electrodes and the production quality of battery cells. Utility Model Content

[0004] The purpose of this application is to provide a cold pressing device and a battery production line to improve the situation where insufficient elongation in the tab area of ​​the electrode sheet causes cold pressing breakage and poor tab extension. This objective is achieved through the following technical solution:

[0005] In a first aspect, this application provides a cold pressing device, comprising: an electrode conveying system, including an unwinding mechanism, a first traction mechanism, a first tension adjusting mechanism, a first pinch roller and a cold pressing mechanism arranged sequentially along the electrode conveying direction; and a heating mechanism disposed between the first traction mechanism and the first tension adjusting mechanism, wherein the heating mechanism is used to heat the tab area of ​​the electrode.

[0006] According to the cold pressing equipment provided in this application, by setting a heating mechanism between the first traction mechanism and the first tension adjustment mechanism, the electrode tab area of ​​the electrode sheet is heated by the heating mechanism, thereby improving the elongation rate of the electrode tab area so that the elongation rate of the electrode tab area can reach the standard of normal production. This can improve the situation of cold pressing strip breakage and poor electrode tab extension caused by insufficient elongation of the electrode tab area, and help improve production efficiency and reduce production costs.

[0007] In addition, the cold pressing equipment provided in this application may also have the following additional technical features:

[0008] In some embodiments of this application, the heating mechanism includes a first heating component and a second heating component, the first heating component and the second heating component being respectively disposed on both sides of the electrode in the width direction, for heating the first tab area and the second tab area formed on both sides of the electrode in the width direction, respectively.

[0009] In the above technical solution, the first heating component and the second heating component of the heating mechanism are respectively disposed on both sides of the width direction of the electrode sheet. By heating the first electrode tab area and the second electrode tab area formed on both sides of the width direction of the electrode sheet respectively, the extension rate of the electrode tabs in the first electrode tab area and the second electrode tab area can be improved, thereby further reducing the risk of tape breakage or poor electrode tab extension during the electrode sheet conveying process.

[0010] In some embodiments of this application, the first heating assembly includes two first heating elements, which are respectively disposed on both sides of the first tab region in the thickness direction; and / or, the second heating assembly includes two second heating elements, which are respectively disposed on both sides of the second tab region in the thickness direction.

[0011] In the above technical solution, by using the two first heating elements of the first heating assembly to heat both sides of the first tab area in the thickness direction, and by using the two second heating elements of the second heating assembly to heat both sides of the second tab area in the thickness direction, the heating efficiency of the tabs in the first and second tab areas of the electrode sheet can be further improved. This allows for rapid adjustment and improvement of the elongation rate of the tabs in the first and second tab areas, enabling the elongation rate to quickly reach the production standard and effectively improving production efficiency.

[0012] In some embodiments of this application, the first heating element and / or the second heating element includes an infrared lamp.

[0013] In the above technical solution, the infrared lamp can emit light with thermal radiation effect. After the irradiated object (the tab area formed on both sides of the width direction of the electrode in this application) absorbs its wavelength energy, it can generate an internal molecular resonance effect, thereby quickly and effectively heating the object, and then quickly adjusting the elongation rate of the tab area. The structure and principle are relatively simple and easy to implement.

[0014] In some embodiments of this application, the cold pressing equipment further includes a detection mechanism, comprising a first detection component and a second detection component, wherein the first detection component is used to detect the elongation rate of the tab area of ​​the electrode sheet after passing through the heating mechanism, and the second detection component is used to detect the belt travel speed of the electrode sheet.

[0015] In the above technical solution, the first detection component of the detection mechanism detects the elongation rate of the electrode after passing through the heating mechanism, and the second detection component detects the belt speed of the electrode. Thus, the heating power of the heating mechanism can be adjusted according to the elongation rate of the electrode after passing through the heating mechanism and the belt speed of the electrode, so as to control and adjust the elongation rate of the tab area according to the detection data.

[0016] In some embodiments of this application, the cold pressing equipment further includes a control device, which is electrically connected to the detection mechanism, the heating mechanism, and the electrode conveying system.

[0017] In the above technical solution, the control device is electrically connected to the detection mechanism, the heating mechanism and the electrode conveying system, so that the controller can automatically adjust the heating power of the heating mechanism in a timely manner according to the elongation rate of the electrode tab after passing through the heating mechanism detected by the detection mechanism and the conveying speed of the electrode, which helps to improve the automation level of the product.

[0018] In some embodiments of this application, the number of the first detection components is two sets, the two sets of the first detection components are respectively disposed on both sides of the width direction of the electrode, and each set of the first detection components includes a first distance sensor and a second distance sensor. The first distance sensor and the second distance sensor are respectively disposed upstream and downstream of the heating mechanism, and are used to detect the width of the electrode tab area respectively; and / or, the second detection component includes a speed sensor.

[0019] In the above technical solution, a set of first detection components is provided on both sides of the width direction of the electrode sheet. Each set of first detection components is provided with a first distance sensor and a second distance sensor distributed upstream and downstream of the heating mechanism (i.e. before and after passing through the heating mechanism). The ratio of the width difference of the electrode tab area measured by the first distance sensor and the second distance sensor to the width of the electrode tab before passing through the heating mechanism can be used to measure the elongation rate of the corresponding electrode tab after passing through the heating mechanism.

[0020] The second detection component includes a speed sensor, which detects the conveyor speed of the electrode sheet and feeds it back to the controller in real time. This allows the controller to adjust the heating power of the heating mechanism in real time based on the conveyor speed of the electrode sheet and the elongation of the electrode tab after passing through the heating mechanism, thereby adjusting the elongation of the electrode tab to meet production standards.

[0021] In some embodiments of this application, the electrode conveying system further includes: a second pinch roller, a second tension adjustment mechanism, a second traction mechanism, and a winding mechanism arranged sequentially downstream of the cold pressing mechanism and along the electrode conveying direction.

[0022] In the above technical solution, by setting a first pinch roller and a second pinch roller upstream and downstream of the cold pressing mechanism respectively, and by using differential stretching between the first pinch roller and the second pinch roller, the coating area and the tab area of ​​the electrode sheet are made to have the same length, thereby reducing the risk of electrode sheet wrinkling. The second tension adjustment mechanism is used to adjust the tension of the electrode sheet, which helps to improve the quality of electrode sheet cold pressing. The second traction mechanism is used to increase the driving force for the electrode sheet to move along the belt direction. The winding mechanism is used to wind up the electrode sheet after cold pressing, thereby realizing a complete closed loop of the electrode sheet cold pressing process.

[0023] In some embodiments of this application, the electrode conveying system further includes: a first climbing roller and a second climbing roller, wherein the first climbing roller is disposed between the heating mechanism and the first tension adjusting mechanism, and the second climbing roller is disposed between the second tension adjusting mechanism and the second traction mechanism; a first passing roller and a second passing roller, wherein the first passing roller is disposed between the first pinch roller and the cold pressing mechanism, and the second passing roller is disposed between the cold pressing mechanism and the second pinch roller.

[0024] By providing a first inclined roller between the heating mechanism and the first tension adjustment mechanism, the first inclined roller continuously provides the driving force required for the electrode to be transferred to the first tension adjustment mechanism after the electrode tab area is heated by the heating mechanism. This ensures that the electrode tab enters the first tension adjustment mechanism smoothly and quickly. The first tension adjustment mechanism, through differential tension adjustment, ensures that the length of the coated area of ​​the electrode is consistent with the length of the tab area, thereby reducing the risk of wrinkling of the electrode. Similarly, by providing a second inclined roller between the second tension adjustment mechanism and the second traction mechanism, the second inclined roller continuously provides the driving force required for the electrode to be transferred to the second traction mechanism after the electrode passes through the second tension adjustment mechanism. This ensures that the electrode enters the second traction mechanism smoothly and quickly.

[0025] By setting a first guide roller between the first pinch roller and the cold pressing mechanism, the first guide roller guides the electrode sheet to move horizontally after it passes the first pinch roller and before it enters the cold pressing mechanism, reducing the risk of wrinkling or breakage of the electrode tabs when it enters the cold pressing mechanism. Similarly, by setting a second guide roller between the cold pressing mechanism and the second pinch roller, the second guide roller guides the electrode sheet to move horizontally after it passes the cold pressing mechanism, ensuring that the electrode sheet experiences relatively balanced force when entering and leaving the cold pressing mechanism, further reducing the risk of wrinkling or breakage of the electrode tabs.

[0026] Secondly, this application provides a battery production line, including the cold pressing equipment as described in the first aspect embodiment. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of a cold pressing device provided in some embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the tab region of the heating electrode plate of the heating mechanism provided in some embodiments of this application.

[0030] The attached figures are labeled as follows:

[0031] 100. Cold pressing equipment; 200. Electrode sheet; 201. Tab area;

[0032] 11. Unwinding mechanism; 12. First traction mechanism; 13. First tension adjustment mechanism; 14. First pinch roll; 15. Cold pressing mechanism; 16. Second pinch roll; 17. Second tension adjustment mechanism; 18. Second traction mechanism; 19. Winding mechanism; 20. Heating mechanism; 21. Lamp cover; 22. Infrared lamp; 30. First climbing roll; 40. Second climbing roll; 50. First guide roll; 60. Second guide roll. Detailed Implementation

[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0038] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0039] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0041] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0042] The battery comprises individual cells, which in turn include electrode assemblies. The motor assembly includes electrode sheets. During the production of individual cells, the electrode sheets undergo a cold pressing process. The coated current collector is then pressed by cold pressing rollers to achieve standard electrode compaction, and then tensioned by pinch rollers to achieve the required tab extension. This process demands high tab extension from the current collector; poorly extended current collectors will frequently experience strip breakage or inadequate tab extension during manufacturing, severely impacting the production capacity of cold-pressed electrode sheets and the overall quality of the individual cells.

[0043] To address the issues of insufficient elongation in the tab area of ​​the electrode sheet, which easily leads to cold-pressing breakage and poor tab extension, this application designs a cold-pressing device. The device includes an unwinding mechanism, a first traction mechanism, a first tension adjustment mechanism, a first pinch roller, and a cold-pressing mechanism arranged sequentially along the electrode sheet's conveying direction. A heating mechanism is provided between the first traction mechanism and the first pinch roller. This heating mechanism heats the tab area of ​​the electrode sheet, enabling it to achieve a preset elongation. This reduces the likelihood of cold-pressing breakage and poor tab extension due to insufficient elongation, thereby improving the production efficiency and quality of the electrode sheet.

[0044] The cold pressing equipment disclosed in this application includes, but is not limited to, equipment used in battery manufacturing. This equipment is used to compact electrode sheets (positive and negative electrodes) by applying pressure to increase their density. Cold pressing improves the contact between the active material and the current collector (such as copper and aluminum foil), thereby reducing the battery's internal resistance and improving its electrochemical performance. By employing the cold pressing equipment provided in this application, the problem of insufficient elongation in the tab area of ​​the electrode sheet, which easily leads to cold pressing breakage or poor tab extension, can be improved during electrode production, thus increasing the production efficiency of the electrode sheets.

[0045] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a cold pressing device provided in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of the tab area of ​​the heating mechanism for heating the electrode sheet provided in some embodiments of this application. Embodiments of this application provide a cold pressing device 100, including an electrode sheet conveying system, comprising an unwinding mechanism 11, a first traction mechanism 12, a first tension adjusting mechanism 13, a first pinch roller 14, and a cold pressing mechanism 15 arranged sequentially along the belt travel direction of the electrode sheet 200. A heating mechanism 20 is provided between the first traction mechanism 12 and the first tension adjusting mechanism 13, and the heating mechanism 20 is used to heat the tab area 201 of the electrode sheet 200.

[0046] Exemplarily, the electrode 200 includes a current collector, which includes a coating area and tab areas 201 located on both sides of the coating area in the width direction. The coating area is coated with an active material, while the tab areas 201 are not coated with an active material and are used to cut and form tabs. Exemplarily, the electrode 200 in this embodiment includes a cathode electrode 200.

[0047] For example, the unwinding mechanism 11 includes an unwinding roller for unwinding the electrode sheet 200.

[0048] The first traction mechanism 12 includes a first traction roller assembly for providing the traction force required for the electrode 200 to travel.

[0049] The first tension adjustment mechanism 13 includes a first tension adjustment roller assembly, which is used to adjust the tension of the electrode 200 between the first traction mechanism 12 and the cold pressing mechanism 15, thereby reducing the risk of the electrode 200 slipping due to insufficient tension or the electrode 200 being deformed or broken due to excessive tension.

[0050] The first pinch roller 14 is used to improve the wrinkling problem of the electrode 200. During the rolling process, the tab area 201 of the electrode 200 is relatively thin and cannot contact the cold pressing mechanism 15 under double-sided coating. Due to the pressure of the roller on the coating area, the tension on both sides is inconsistent. The first pinch roller 14 adjusts the tension by differential stretching so that the length of the coating area and the tab area 201 are consistent, thereby improving the wrinkling problem of the electrode 200.

[0051] The cold pressing mechanism 15 includes a cold pressing roller assembly, which uses upper and lower cold pressing rollers to press the surface of the coating area to compact the active material, thereby increasing the content of active material per unit volume and improving the performance and safety of the battery cell.

[0052] For example, the heating mechanism 20 can be an infrared lamp 22 or an electromagnetic heating element, etc.

[0053] According to the cold pressing equipment 100 provided in this application, by setting a heating mechanism 20 between the first traction mechanism 12 and the first tension adjustment mechanism 13, the electrode tab region 201 of the electrode sheet 200 is heated by the heating mechanism 20, thereby improving the elongation rate of the electrode tab region 201, so that the elongation rate of the electrode tab region 201 of the electrode sheet 200 can reach the standard of normal production. This can improve the situation of cold pressing strip breakage and poor electrode tab extension caused by insufficient elongation of the electrode tab region 201 of the electrode sheet 200, and help improve production efficiency and reduce production costs.

[0054] According to some embodiments of this application, the heating mechanism 20 includes a first heating component and a second heating component, which are respectively disposed on both sides of the electrode 200 in the width direction, for heating the first tab area and the second tab area formed on both sides of the electrode 200 in the width direction, respectively.

[0055] Specifically, the first tab region and the second tab region are located on both sides of the width direction of the coating region.

[0056] The first heating component and the second heating component of the heating mechanism 20 are respectively disposed on both sides of the electrode 200 in the width direction. By heating the first tab area and the second tab area formed on both sides of the electrode 200 in the width direction respectively, the extension rate of the tabs in the first tab area and the second tab area can be improved, thereby further reducing the risk of tape breakage or poor tab extension during the tape-carrying process of the electrode 200.

[0057] According to some embodiments of this application, the first heating assembly includes two first heating elements, which are respectively disposed on both sides of the first tab region in the thickness direction; the second heating assembly includes two second heating elements, which are respectively disposed on both sides of the second tab region in the thickness direction.

[0058] By using the two first heating elements of the first heating assembly to heat both sides of the first tab region in the thickness direction, and using the two second heating elements of the second heating assembly to heat both sides of the second tab region in the thickness direction, the heating efficiency of the tabs in the first and second tab regions of the electrode sheet 200 can be further improved. This allows for rapid adjustment and improvement of the elongation rate of the tabs in the first and second tab regions, enabling the elongation rate to quickly reach the production standard and effectively improve production efficiency.

[0059] Please see Figure 2 According to some embodiments of this application, the first heating element and the second heating element include an infrared lamp 22.

[0060] As an example, the infrared lamp 22 is provided with a lamp cover 21 on the side away from the electrode 200. The lamp cover 21 partially covers the side of the infrared lamp 22 away from the electrode 200, and the side of the lamp cover 21 facing the electrode 200 has a concave surface.

[0061] The infrared lamp 22 can emit light with a thermal radiation effect. After the irradiated object (the tab region 201 formed on both sides of the width direction of the electrode 200 in this application) absorbs its wavelength energy, it can generate an internal molecular resonance effect, thereby heating the object quickly and effectively, and then quickly adjusting the elongation of the tab region 201. The structure and principle are relatively simple and easy to implement.

[0062] According to some embodiments of this application, the cold pressing equipment 100 further includes a detection mechanism and a control device. The detection mechanism includes a first detection component and a second detection component. The first detection component is used to detect the elongation rate of the tab region 201 of the electrode 200 after passing through the heating mechanism 20, and the second detection component is used to detect the belt travel speed of the electrode 200.

[0063] The first detection component detects the elongation of the electrode after it passes through the heating mechanism, and the second detection component detects the belt speed of the electrode. Based on the elongation of the electrode after it passes through the heating mechanism and the belt speed of the electrode, the heating power of the heating mechanism can be adjusted so as to control and adjust the elongation of the tab area according to the detection data.

[0064] According to some embodiments of this application, the control device is electrically connected to the detection mechanism, the heating mechanism 20, and the electrode conveying system.

[0065] For example, the control device may be a programmable logic controller.

[0066] The control device is electrically connected to the detection mechanism, the heating mechanism 20 and the electrode conveying system, so that the controller can adjust the heating power of the heating mechanism 20 in a timely manner according to the elongation rate of the electrode tab after passing through the heating mechanism 20 detected by the detection mechanism and the belt speed of the electrode 200, so as to further realize the rapid adjustment of the elongation rate of the electrode tab area 201 of the electrode 200 and help improve the automation level of the product.

[0067] According to some embodiments of this application, the number of first detection components is two sets, and the two sets of first detection components are respectively disposed on both sides of the width direction of the electrode 200. Each set of first detection components includes a first distance sensor and a second distance sensor. The first distance sensor and the second distance sensor are respectively disposed upstream and downstream of the heating mechanism 20, and are used to detect the width of the tab area 201 respectively. The second detection component includes a speed sensor.

[0068] That is, a set of first detection components is provided on both sides of the width direction of the electrode 200. Each set of first detection components is provided with a first distance sensor and a second distance sensor distributed upstream and downstream of the heating mechanism 20 (i.e. before and after passing through the heating mechanism 20). The ratio of the width difference of the electrode tab in the electrode tab area 201 measured by the first distance sensor and the second distance sensor to the width of the electrode tab before passing through the heating mechanism 20 can be used to measure the elongation rate of the corresponding electrode tab after passing through the heating mechanism 20.

[0069] The second detection component includes a speed sensor, which detects the belt speed of the electrode 200 and feeds it back to the controller in real time. This allows the controller to adjust the heating power of the heating mechanism 20 in real time based on the belt speed of the electrode 200 and the elongation of the electrode tab after passing through the heating mechanism 20, so as to adjust the elongation of the electrode tab in real time to meet the production standards.

[0070] Please see Figure 1According to some embodiments of this application, the electrode conveying system further includes: a second pinch roller 16, a second tension adjustment mechanism 17, a second traction mechanism 18, and a winding mechanism 19, which are arranged downstream of the cold pressing mechanism 15 and sequentially along the belt-carrying direction of the electrode 200.

[0071] The upstream and downstream of the cold pressing mechanism 15 refer to the processes that are set before and after the cold pressing mechanism 15 in the electrode cold pressing process, respectively.

[0072] For example, the second pinch roller 16, the second tension adjustment mechanism 17, the second traction mechanism 18, and the winding mechanism 19 are respectively arranged on opposite sides of the cold pressing mechanism 15, corresponding to the first pinch roller 14, the first tension adjustment mechanism 13, the first traction mechanism 12, and the unwinding mechanism 11. The second pinch roller 16, the second tension adjustment mechanism 17, and the second traction mechanism 18 have the same structure and operating principle as the first pinch roller 14, the first tension adjustment mechanism 13, and the first traction mechanism 12 for the electrode sheet 200, and the winding mechanism 19 is used to wind up the cold-pressed electrode sheet 200.

[0073] By setting a first pinch roller 14 and a second pinch roller 16 upstream and downstream of the cold pressing mechanism 15 respectively, and by using differential stretching, the coating area and tab area 201 of the electrode 200 are made to have the same length, thereby reducing the risk of wrinkling of the electrode 200. The second tension adjustment mechanism 17 is used to adjust the tension of the electrode 200, which helps to improve the quality of cold pressing of the electrode 200. The second traction mechanism 18 is used to increase the driving force for the electrode 200 to move along the belt direction. The winding mechanism 19 is used to wind up the electrode 200 after cold pressing, thereby realizing a complete closed loop of the cold pressing process of the electrode 200.

[0074] Please see Figure 1 According to some embodiments of this application, the electrode conveying system further includes: a first climbing roller 30 and a second climbing roller 40, wherein the first climbing roller 30 is disposed between the heating mechanism 20 and the first tension adjusting mechanism 13, and the second climbing roller 40 is disposed between the second tension adjusting mechanism 17 and the second traction mechanism 18.

[0075] The electrode conveying system also includes a first guide roller 50 and a second guide roller 60. The first guide roller 50 is located between the first pinch roller 14 and the cold pressing mechanism 15, and the second guide roller 60 is located between the cold pressing mechanism 15 and the second pinch roller 16.

[0076] By providing a first inclined roller 30 between the heating mechanism 20 and the first tension adjustment mechanism 13, the first inclined roller 30 continuously provides the driving force required for the electrode 200 to be transmitted to the first tension adjustment mechanism 13 after the electrode 200 has passed through the heating mechanism 20 to heat the tab area 201 of the tab, so that the tab can smoothly and quickly enter the first tension adjustment mechanism 13. The first tension adjustment mechanism 13 adjusts the tension by differential tension, so that the length of the coating area of ​​the electrode 200 is consistent with the length of the tab area 201, thereby reducing the risk of wrinkling of the electrode 200. Similarly, by providing a second inclined roller 40 between the second tension adjustment mechanism 17 and the second traction mechanism 18, the second inclined roller 40 continuously provides the driving force required for the electrode 200 to be transmitted to the second traction mechanism after the electrode 200 has passed through the second tension adjustment mechanism 17, so that the electrode 200 can smoothly and quickly enter the second traction mechanism 18.

[0077] By providing a first guide roller 50 between the first pinch roller 14 and the cold pressing mechanism 15, the first guide roller 50 guides the electrode 200 to move horizontally before entering the cold pressing mechanism 15 after it passes the first pinch roller 14, reducing the risk of wrinkling or breakage of the electrode tabs when they enter the cold pressing mechanism 15. Similarly, by providing a second guide roller 60 between the cold pressing mechanism 15 and the second pinch roller 16, the second guide roller 60 guides the electrode 200 to move horizontally after it passes the cold pressing mechanism 15, ensuring that the electrode 200 experiences relatively balanced force when entering and leaving the cold pressing mechanism 15, further reducing the risk of wrinkling or breakage of the electrode tabs.

[0078] According to some embodiments of this application, see Figure 1 and Figure 2This application provides a cold pressing device 100, including an electrode conveying system, a heating mechanism 20, a detection mechanism, and a control device. The electrode conveying system includes an unwinding mechanism 11, a first traction mechanism 12, a first tension adjusting mechanism 13, a first pinch roller 14, a cold pressing mechanism 15, a second pinch roller 16, a second tension adjusting mechanism 17, a second traction mechanism 18, and a winding mechanism 19, arranged sequentially along the belt travel direction of the electrode 200. The heating mechanism 20 is disposed between the first traction mechanism 12 and the first tension adjusting mechanism 13, and is used to heat the tab area 201 of the electrode 200 to adjust the elongation of the tab area 201. The detection mechanism includes a first detection component and a second detection component. The first detection component is used to detect the elongation of the tab area 201 of the electrode 200 after passing through the heating mechanism 20, and the second detection component is used to control the belt travel speed of the electrode 200. The control device is electrically connected to the electrode conveying system, the detection mechanism and the heating mechanism 20. It is used to control the heating power of the heating mechanism 20 according to the elongation rate of the electrode tab after passing through the heating mechanism 20 detected by the detection mechanism and the belt speed of the electrode 200, so as to adjust the elongation rate of the electrode tab region 201 of the electrode 200 in real time.

[0079] According to some embodiments of this application, this application also provides a battery production line, including the cold pressing equipment described in the above embodiments.

[0080] The battery production line provided in this application may also include die-cutting equipment, winding equipment, etc. The die-cutting equipment is used to die-cut and cut the tab area 201 of the electrode sheet 200, and the winding equipment is used to wind the positive electrode sheet 200, the separator and the negative electrode sheet 200 to form an electrode assembly. Since it includes the cold pressing equipment described in the above embodiments, it also has the technical effects described in the above embodiments, which will not be repeated here.

[0081] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cold pressing device, characterized in that, include: The electrode conveying system includes an unwinding mechanism, a first traction mechanism, a first tension adjusting mechanism, a first pinch roller, and a cold pressing mechanism arranged sequentially along the electrode conveying direction; A heating mechanism is located between the first traction mechanism and the first tension adjustment mechanism, and the heating mechanism is used to heat the tab area of ​​the electrode sheet.

2. The cold pressing equipment according to claim 1, characterized in that, The heating mechanism includes a first heating component and a second heating component, which are respectively disposed on both sides of the electrode in the width direction, for heating the first tab area and the second tab area formed on both sides of the electrode in the width direction.

3. The cold pressing equipment according to claim 2, characterized in that, The first heating assembly includes two first heating elements, which are respectively disposed on both sides of the first tab region in the thickness direction; And / or, the second heating assembly includes two second heating elements, which are respectively disposed on both sides of the second tab region in the thickness direction.

4. The cold pressing equipment according to claim 3, characterized in that, The first heating element and / or the second heating element include an infrared lamp.

5. The cold pressing equipment according to any one of claims 1-4, characterized in that, The cold pressing equipment also includes: The testing mechanism includes a first testing component and a second testing component. The first testing component is used to detect the elongation of the tab area of ​​the electrode after passing through the heating mechanism, and the second testing component is used to detect the belt travel speed of the electrode.

6. The cold pressing equipment according to claim 5, characterized in that, The cold pressing equipment further includes a control device, which is electrically connected to the detection mechanism, the heating mechanism, and the electrode conveying system.

7. The cold pressing equipment according to claim 5, characterized in that, The number of the first detection components is two sets. The two sets of the first detection components are respectively used to be arranged on both sides of the width direction of the electrode. Each set of the first detection components includes a first distance sensor and a second distance sensor. The first distance sensor and the second distance sensor are respectively arranged upstream and downstream of the heating mechanism and are used to detect the width of the electrode area respectively. And / or, the second detection component includes a speed sensor.

8. The cold pressing equipment according to any one of claims 1-4, characterized in that, The electrode conveying system further includes a second pinch roller, a second tension adjustment mechanism, a second traction mechanism, and a winding mechanism, which are located downstream of the cold pressing mechanism and arranged sequentially along the electrode conveying direction.

9. The cold pressing equipment according to claim 8, characterized in that, The electrode conveying system also includes: A first climbing roller and a second climbing roller, wherein the first climbing roller is disposed between the heating mechanism and the first tension adjusting mechanism, and the second climbing roller is disposed between the second tension adjusting mechanism and the second traction mechanism; A first feed roller and a second feed roller are provided, wherein the first feed roller is disposed between the first pinch roller and the cold pressing mechanism, and the second feed roller is disposed between the cold pressing mechanism and the second pinch roller.

10. A battery production line, characterized in that, Includes the cold pressing equipment as described in any one of claims 1-9.

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