Cold pressing device and battery production system

Abstract

The embodiment of the utility model provides a cold pressing device and a battery production system, the cold pressing device is used in a cold pressing process of a pole piece base material, the pole piece base material comprises a tab area and a coating area which are alternately arranged, and the coating area is coated with an active material layer. The cold pressing device comprises at least one pair of cold pressing rollers, a slitting knife and a color code sensor. And the at least one pair of cold pressing rollers is used for performing cold pressing on two opposite sides of the pole piece base material. And the slitting knife is positioned at the downstream of the cold pressing roller and is used for cutting the tab area along the extension direction of the pole piece base material, so that at least one tab area is cut into two sub tab areas. And the color code sensor is positioned at the downstream of the slitting knife and is used for measuring the width of at least one sub tab area. The quality of the electrode assembly can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a cold pressing device and a battery production system. BACKGROUND

[0002] Battery cells are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, and electric tools, etc.

[0003] A battery cell includes an electrode assembly, and how to improve the quality of the electrode assembly is a research direction in the battery technology. INNOVATION CONTENT

[0004] The present application provides a cold pressing device and a battery production system, which can improve the quality of the electrode assembly.

[0005] The present application provides a cold pressing device, which is used in a cold pressing process of a tab substrate. The tab substrate includes tab ear regions and coating regions arranged alternately, and the coating regions are coated with active material layers. The cold pressing device includes at least one pair of cold pressing rollers, a slitting cutter, and a color mark sensor. The at least one pair of cold pressing rollers is used to cold press two opposite sides of the tab substrate. The slitting cutter is located downstream of the cold pressing rollers and is used to cut the tab ear regions along the extension direction of the tab substrate to form at least one tab ear region into two sub-tab ear regions. The color mark sensor is located downstream of the slitting cutter, and the color mark sensor is used to measure the width of the at least one sub-tab ear region.

[0006] In the above technical solution, the cold pressing device of the present application measures the width of the at least one sub-tab ear region by setting the color mark sensor, and judges whether the sub-tab ear region has a crack according to the width, so that the operator can know the occurrence of the crack in time and perform the next operation, thereby reducing the tab damage problem caused by the crack and improving the quality of the electrode assembly.

[0007] In some embodiments, the color mark sensor is configured to measure the width of each of the at least two adjacent sub-tab ear regions.

[0008] In the above technical solution, the width of each of the at least two adjacent sub-tab ear regions is measured by the color mark sensor, so that one color mark sensor can monitor a larger number of sub-tab ear regions, thereby reducing the cost.

[0009] In some embodiments, the cold pressing device includes a controller configured to control the actions of the cold pressing rollers and the slitting cutter. The color mark sensor is connected to the controller and is configured to send a shutdown information to the controller. The controller is configured to control the cold pressing rollers and the slitting cutter to stop the actions after receiving the shutdown information.

[0010] In the technical scheme, the color sensor is connected with the controller, so that the machine can be automatically stopped without manual operation after the crack appears, and the labor cost is saved.

[0011] In some embodiments, the cold pressing device further comprises an alarm mechanism, the controller is connected with the alarm mechanism, and the controller is configured to alarm the alarm mechanism after receiving the stop information.

[0012] In the technical scheme, the alarm mechanism is used for alarming, so that the operator can be informed in time.

[0013] In some embodiments, the alarm mechanism comprises at least one of an alarm lamp and a sound alarm.

[0014] In the technical scheme, the alarm mechanism is set as an alarm lamp or a sound alarm, which has obvious warning effect and is convenient for the operator to know in time.

[0015] In some embodiments, the cold pressing device further comprises a driving member, the driving member is used to drive the color sensor to move linearly and reciprocally along the width direction of the pole piece substrate, so as to measure the width of at least two adjacent sub-tab areas respectively.

[0016] In the technical scheme, the driving member is provided to drive the color sensor to move linearly and reciprocally to measure the width of at least two adjacent sub-tab areas respectively, so as to increase the measurement range of the color sensor and reduce the cost.

[0017] In some embodiments, the cold pressing device further comprises a threaded rod, a guide rod and a sliding block, the threaded rod and the guide rod are arranged side by side, the sliding block is threadedly connected with the threaded rod, and the sliding block and the guide rod are slidingly connected, the driving member is connected with the threaded rod, the color sensor is connected with the sliding block, and the driving member drives the sliding block and the color sensor to move linearly and reciprocally through the threaded rod.

[0018] In the technical scheme, the transmission mechanism composed of the threaded rod, the guide rod and the sliding block has high transmission accuracy, and the driving member outputting rotary action can achieve high running speed through the threaded rod, the guide rod and the sliding block, so that the at least two sub-tab areas continuously walking can be monitored in time.

[0019] In some embodiments, the cold pressing device further comprises a gear and a rack, the gear and the rack are engaged with each other, the gear is connected with the driving member, the color sensor is connected with the rack, and the driving member drives the rack and the color sensor to move linearly and reciprocally through the gear.

[0020] In the technical scheme, the transmission mechanism of the gear and the rack has high reliability, and the driving member outputting rotary action can achieve high running speed through the gear and the rack, so that the at least two sub-tab areas continuously walking can be monitored in time.

[0021] In some embodiments, the cold pressing device further comprises a rack body, and the color mark sensor is fixedly arranged on the rack body.

[0022] In the above technical solution, the color mark sensor is fixedly arranged on the rack body, which facilitates the installation of the color mark sensor.

[0023] In some embodiments, the cold pressing device further comprises a tension roller, which is located upstream of the slitting knife and used to apply tension to the jelly-roll base material.

[0024] In the above technical solution, the tension roller is arranged to tension the jelly-roll base material, which facilitates subsequent slitting.

[0025] In a second aspect, the embodiments of the present application further provide a battery production system, comprising the cold pressing device described above. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0027] Figure 1 A structural schematic diagram of a cold pressing device provided by some embodiments of the present application;

[0028] Figure 2 A structural schematic diagram of a jelly-roll base material after being slit by the cold pressing device provided by some embodiments of the present application;

[0029] Figure 3 Another structural schematic diagram of the cold pressing device after being slit by the cold pressing device provided by some embodiments of the present application;

[0030] Figure 4 Another structural schematic diagram of the cold pressing device provided by some embodiments of the present application;

[0031] Figure 5 A partial structural schematic diagram of the cold pressing device provided by some embodiments of the present application;

[0032] Figure 6 Another partial structural schematic diagram of the cold pressing device provided by some embodiments of the present application.

[0033] Corresponding reference signs in the detailed description of the embodiments are as follows:

[0034] 100, cold pressing device; 200, jelly-roll base material; 210, tab area; 220, coating area; 230, sub-tab area;

[0035] 1, cold pressing roller;

[0036] 2. slitting knife;

[0037] 3. color sensor;

[0038] 4. tension roller;

[0039] 5. controller;

[0040] 6. alarm mechanism;

[0041] 7. driving member;

[0042] 81. threaded rod; 82. guide rod; 83. sliding block;

[0043] 91. gear; 92. rack. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationships.

[0046] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it independent or alternative to other embodiments.

[0047] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0049] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0050] "Multiple" appearing in the present application means two or more (including two).

[0051] In the present application, the battery cell can include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, etc. The present application embodiments are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The present application embodiments are also not limited thereto.

[0052] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode tab, a negative electrode tab and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode coating area coated with the positive electrode active material layer and a positive electrode tab connected to the positive electrode coating area, and the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium ion battery cell as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, which can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area coated with the negative electrode active material layer and a negative electrode tab connected to the negative electrode coating area, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene) or the like.

[0053] In the cold pressing process, the tab area in the middle usually needs to be cut into two halves by a cutting knife. After cutting, the tab part is prone to have a crack, and the cracked tab is prone to be folded towards the coated area of the tab in the subsequent process. In this way, in the winding process, the folded tab is pressed by the subsequent tab and folded into the coated area. After winding, the folded tab will damage the tab on the outer layer, affecting the quality of the electrode assembly.

[0054] Therefore, the application provides a cold pressing device. The color sensor is arranged to monitor the width of the at least one sub-tab area after cutting, and determine whether the sub-tab area has a crack according to the monitored width. The operator can know the occurrence of the crack in time and perform the next operation, thereby reducing the damage of the tab caused by the crack and improving the quality of the electrode assembly.

[0055] Figure 1 A structural schematic diagram of a cold pressing device provided by some embodiments of the application is shown in FIG. 1; Figure 2 A structural schematic diagram of a tab substrate after cutting is shown in FIG. 2; Figure 3 Another structural schematic diagram of a cold pressing device after cutting is shown in FIG. 3.

[0056] As shown in FIG. 1, the cold pressing device includes a color sensor 1, a cutting knife 2 and a cold pressing device 3. Figures 1 to 3As shown, the application also provides a cold-pressing device 100 for use in a cold-pressing process of a pole piece substrate 200. The pole piece substrate 200 includes pole tab regions 210 and coating regions 220 arranged alternately, and the coating regions 220 are coated with an active material layer. The cold-pressing device 100 includes at least one pair of cold-pressing rollers 1, a slitting cutter 2, and a color sensor 3. The at least one pair of cold-pressing rollers 1 is used to cold-press opposite sides of the pole piece substrate 200. The slitting cutter 2 is located downstream of the cold-pressing rollers 1 and is used to cut the pole tab regions 210 along the extension direction of the pole piece substrate 200, so as to form at least one pole tab region 210 into two sub-pole tab regions 230. The color sensor 3 is located downstream of the slitting cutter 2, and the color sensor is used to measure the width of at least one sub-pole tab region 230.

[0057] For example, the pole piece substrate 200 includes pole tab regions 210, coating regions 220, pole tab regions 210, coating regions 220, and pole tab regions 210 arranged in sequence along the width direction. For another example, the pole piece substrate 200 includes pole tab regions 210, coating regions 220, pole tab regions 210, coating regions 220, pole tab regions 210, coating regions 220, and pole tab regions 210 arranged in sequence along the width direction. The pole tab regions 210 of the present embodiment are not coated with an active material layer.

[0058] The cold-pressing rollers 1 of the present embodiment are arranged in pairs and are used to cold-press opposite sides of the pole piece substrate 200.

[0059] For example, the slitting cutter 2 of the present embodiment cuts the pole tab regions 210 at positions other than the edges. Optionally, the slitting cutter 2 includes a roller body and a blade arranged around the outer circumferential side of the roller body. When the pole piece substrate 200 includes pole tab regions 210, coating regions 220, pole tab regions 210, coating regions 220, and pole tab regions 210 arranged in sequence along the width direction, the slitting cutter 2 cuts the pole tab region 210 located in the middle into two sub-pole tab regions 230, and the pole piece substrate 200 becomes two pieces. When the pole piece substrate 200 includes pole tab regions 210, coating regions 220, pole tab regions 210, coating regions 220, pole tab regions 210, coating regions 220, and pole tab regions 210 arranged in sequence along the width direction, the slitting cutter 2 cuts the two pole tab regions 210 located in the middle, forming four sub-pole tab regions 230, and the pole piece substrate 200 becomes three pieces.

[0060] The color sensor 3 of the embodiment is used to measure the width of at least one sub-tab area 230. When measuring, the illumination range of the color sensor 3 needs to include at least part of the coating area 220, which is generally black, and the sub-tab area 230, which is a color different from black. When the tab substrate 200 is made of copper, the color is yellow, and when the tab substrate 200 is made of aluminum, the color is white. The color sensor 3 measures the width of the sub-tab area 230 according to the brightness threshold difference. The color sensor 3 compares the measured width of the sub-tab area 230 with a preset width, and determines that the sub-tab area 230 has a crack when the width of the sub-tab area 230 is less than the preset width.

[0061] The cold pressing device 100 of the embodiment measures the width of at least one sub-tab area 230 by setting the color sensor 3, and determines whether a crack occurs according to the width. This facilitates the operator to learn about the occurrence of the crack in time and perform the next operation, reduces the damage of the tab caused by the crack, and improves the quality of the electrode assembly.

[0062] Please continue to refer to Figure 2 and Figure 3 In some embodiments, the color sensor is configured to measure the width of each of the two adjacent sub-tab areas 230.

[0063] The two adjacent sub-tab areas 230 of the embodiment can be two sub-tab areas 230 formed by cutting one tab area 210, as shown in Figure 2 The two adjacent sub-tab areas 230 of the embodiment can also be two of the four sub-tab areas 230 formed by cutting two tab areas 210, and the other two sub-tab areas 230 and the intermediate coating area 220 are wound to other positions, as shown in Figure 3 .

[0064] Measuring the width of each of the two adjacent sub-tab areas 230 by using the color sensor can enable one color sensor 3 to monitor a larger number of sub-tab areas 230, thereby reducing the cost.

[0065] Figure 4 Another structural schematic diagram of the cold pressing device provided for some embodiments of the application is provided.

[0066] Please refer to Figure 4 In some embodiments, the cold pressing device 100 includes a controller 5, the controller 5 is used to control the actions of the cold pressing roller 1 and the cutting knife 2, the color sensor 3 is connected with the controller 5 and is used to send the information of stopping to the controller 5, and the controller 5 is configured to control the cold pressing roller 1 and the cutting knife 2 to stop the actions after receiving the information of stopping.

[0067] The controller 5 of the embodiment controls the rotation of a pair of cold pressing rollers 1 and the cutting of the cutting knife 2.

[0068] The color scale sensor 3 of the embodiment sends shutdown information to the controller 5 after determining that the sub-tab area 230 has a crack, and the controller 5 controls the cold-pressing roller 1 and the slitting cutter 2 to stop operating after receiving the information, and the operator processes the crack, which can be flattened or pulled off and removed.

[0069] The color scale sensor 3 is connected with the controller 5, so that the cold-pressing device 100 can automatically shut down without manual operation after the crack occurs, thereby saving labor costs.

[0070] In some embodiments, the cold-pressing device 100 further comprises an alarm mechanism 6, and the controller 5 is connected with the alarm mechanism 6 and is configured to make the alarm mechanism 6 alarm after receiving the shutdown information.

[0071] The alarm mechanism 6 of the embodiment can be a display, which displays alarm information through the display. The alarm mechanism 6 can also be a vibration alarm, which alarms the operator by vibrating.

[0072] The alarm mechanism 6 alarms, which can help the operator to know in time.

[0073] In some embodiments, the alarm mechanism 6 comprises at least one of an alarm lamp and a sound alarm.

[0074] The sound alarm of the embodiment can be a buzzer or a loudspeaker.

[0075] The alarm mechanism 6 is set as an alarm lamp or a sound alarm, which has a more obvious alarm effect and can help the operator to know in time.

[0076] Figure 5 A partial structure schematic view of the cold-pressing device provided by some embodiments of the application.

[0077] Please refer to Figure 5 In some embodiments, the cold-pressing device 100 further comprises a driving member 7, which is used to drive the color scale sensor 3 to move linearly and reciprocally along the width direction of the pole piece substrate 200 to measure the width of at least two adjacent sub-tab areas 230.

[0078] The driving member 7 of the embodiment can be a linear motor, a rotary motor, an air cylinder or a hydraulic cylinder, etc. The linear motor, the air cylinder or the hydraulic cylinder directly drives the color scale sensor 3 to move linearly and reciprocally, and the rotary motor needs a transmission mechanism to convert the motion form into linear reciprocating motion.

[0079] The two adjacent sub-tab areas 230 of the embodiment can be two sub-tab areas 230 formed by slitting the same tab area 210, as shown in Figure 2As shown; or two of the four sub-tab regions 230 formed by the two tab regions 210 being cut, the other two sub-tab regions 230 and the middle coating region 220 being rolled to other positions, such as Figure 3 As shown.

[0080] The driving member 7 is arranged to drive the color sensor 3 to move linearly reciprocatingly to measure the width of each of the at least two adjacent sub-tab regions 230, increase the measurement range of the color sensor 3, and thus reduce the cost.

[0081] In some embodiments, the cold pressing device 100 further comprises a threaded rod 81, a guide rod 82, and a sliding block 83, the threaded rod 81 and the guide rod 82 are arranged side by side, the sliding block 83 is threadedly connected with the threaded rod 81 and slidingly connected with the guide rod 82, the driving member 7 is connected with the threaded rod 81, and the color sensor 3 is connected with the sliding block 83. The driving member 7 drives the sliding block 83 and the color sensor 3 to move linearly reciprocatingly through the threaded rod 81.

[0082] The threaded rod 81 and the guide rod 82 of the embodiment are arranged side by side, i.e., parallel to each other.

[0083] The sliding block 83 and the threaded rod 81 of the embodiment are threadedly connected, i.e., the sliding block 83 is sleeved on the threaded rod 81 and both are provided with threads, and the threads of the two are connected with each other.

[0084] The sliding block 83 and the guide rod 82 of the embodiment are slidingly connected, i.e., the sliding block 83 can be sleeved on the guide rod 82 to achieve sliding connection, or the sliding block 83 and the guide rod 82 can be embedded and limited to achieve sliding connection. For example, the guide rod 82 is T-shaped, the part of the sliding block 83 connected with the guide rod 82 forms a mouth-shaped type with a notch, the vertical part of the T-shaped guide rod 82 extends from the notch, and the horizontal part is located in the mouth-shaped type, so as to achieve sliding connection.

[0085] The driving member 7 of the embodiment drives the threaded rod 81 to rotate, and the sliding block 83 threadedly connected with the threaded rod 81 moves linearly reciprocatingly along the guide rod 82.

[0086] The color sensor 3 of the embodiment can be arranged on the upper surface of the sliding block 83 or on the lower surface of the sliding block 83.

[0087] The driving member 7 of the embodiment can be a motor outputting a rotating action.

[0088] The transmission mechanism composed of the threaded rod 81, the guide rod 82, and the sliding block 83 has high transmission accuracy, and the driving member 7 outputting a rotating action can achieve high running speed through the threaded rod 81, the guide rod 82, and the sliding block 83, so that the at least two sub-tab regions 230 continuously moving can be timely monitored.

[0089] In some embodiments, the cold pressing device 100 further comprises a gear 91 and a rack 92, the gear 91 and the rack 92 are engaged with each other, the gear 91 is connected with the driving member 7, and the color mark sensor 3 is connected to the rack 92, the driving member 7 drives the rack 92 and the color mark sensor 3 to do linear reciprocating motion through the gear 91.

[0090] The driving member 7 of the embodiment can be a motor outputting rotating action.

[0091] The transmission mechanism of the gear 91 and the rack 92 has high reliability, and the driving member 7 outputting rotating action can reach high running speed through the gear 91 and the rack 92, so that the at least two sub-tab areas 230 continuously walking can be timely monitored.

[0092] In some embodiments, the cold pressing device 100 further comprises a frame body, and the color mark sensor 3 is fixedly arranged on the frame body.

[0093] The color mark sensor 3 of the embodiment can be connected with the frame body in a threaded connection or bonding manner.

[0094] The color mark sensor 3 is fixedly arranged on the frame body, which facilitates the installation of the color mark sensor 3.

[0095] In some embodiments, the cold pressing device 100 further comprises a tension roller 4, which is located upstream of the slitting knife 2 and is used to apply tension to the pole piece base material 200.

[0096] The tension roller 4 of the embodiment can be located above the pole piece base material 200, or below the pole piece base material 200. The tension roller 4 of the embodiment can be located upstream of the cold pressing roller 1, or downstream of the cold pressing roller 1.

[0097] The tension roller 4 is arranged to tension the pole piece base material 200, which facilitates subsequent slitting.

[0098] The embodiment of the application further provides a battery production system, which comprises the above cold pressing device 100.

[0099] Illustratively, the battery production system further comprises a die cutting device, which is used to slit the tab area 210 and the sub-tab area 230 to form a plurality of tabs.

[0100] Illustratively, the battery production system further comprises a pole piece coating device, which is located upstream of the cold pressing device 100 and is used to coat active material on at least one side of the current collector.

[0101] Illustratively, the battery production system further comprises a drying device, which is located downstream of the pole piece coating device and upstream of the cold pressing device 100, and is used to dry the current collector coated with active material to form a dried pole piece.

[0102] Please refer to Figures 1-4 The embodiment of the present application provides a cold pressing device 100, which is used in a cold pressing process of a pole piece substrate 200. The pole piece substrate 200 comprises pole tab areas 210 and coating areas 220 arranged alternately, and the coating areas 220 are coated with an active material layer. The cold pressing device 100 comprises at least one pair of cold pressing rollers 1, a slitting cutter 2 and a color mark sensor 3. The at least one pair of cold pressing rollers 1 are used for cold pressing two opposite sides of the pole piece substrate 200. The slitting cutter 2 is located downstream of the cold pressing rollers 1 and is used for cutting the pole tab areas 210 along the extension direction of the pole piece substrate 200, so as to at least cut one pole tab area 210 into two sub-pole tab areas 230. The color mark sensor 3 is located downstream of the slitting cutter 2, and the color mark sensor is used for measuring the width of the at least one sub-pole tab area 230. The cold pressing device 100 comprises a controller 5, the controller 5 is used for controlling the actions of the cold pressing rollers 1 and the slitting cutter 2, the color mark sensor 3 is connected with the controller 5 and is used for sending a stop information to the controller 5, and the controller 5 is configured to control the cold pressing rollers 1 and the slitting cutter 2 to stop the actions after receiving the stop information. The cold pressing device 100 further comprises an alarm mechanism 6, the controller 5 is connected with the alarm mechanism 6 and is configured to make the alarm mechanism 6 alarm after receiving the stop information. The cold pressing device 100 further comprises a driving member 7, the driving member 7 is used for driving the color mark sensor 3 to do linear reciprocating motion along the width direction of the pole piece substrate 200, so as to measure the widths of at least two adjacent sub-pole tab areas 230 respectively. The cold pressing device 100 further comprises a tension roller 4, the tension roller 4 is located upstream of the slitting cutter 2 and is used for applying tension to the pole piece substrate 200.

[0103] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0104] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cold pressing apparatus for use in a cold pressing process of an electrode substrate, the electrode substrate comprising alternating tab regions and coating regions, the coating regions being coated with an active material layer, characterized in that, The cold pressing device includes: At least one pair of cold press rollers are used to cold press the opposite sides of the electrode substrate; A slitting blade, located downstream of the cold press roller, is used to cut the tab area along the extension direction of the electrode substrate, so as to cut at least one tab area into two sub-tab areas. A color mark sensor, located downstream of the slitting blade, is used to measure the width of at least one of the sub-tab regions.

2. The cold pressing device according to claim 1, characterized in that, The color mark sensor is configured to measure the width of each of at least two adjacent sub-electrode regions.

3. The cold pressing device according to claim 1, characterized in that, The cold pressing device includes a controller for controlling the movement of the cold pressing roller and the slitting knife. The color mark sensor is connected to the controller and is used to send a stop message to the controller. The controller is configured to control the cold pressing roller and the slitting knife to stop moving after receiving the stop message.

4. The cold pressing device according to claim 3, characterized in that, The cold pressing device also includes an alarm mechanism, and the controller is connected to the alarm mechanism and configured to trigger the alarm mechanism upon receiving a shutdown message.

5. The cold pressing device according to claim 4, characterized in that, The alarm mechanism includes at least one of an alarm light and an audible alarm.

6. The cold pressing device according to claim 1, characterized in that, The cold pressing device also includes a driving component, which drives the color mark sensor to reciprocate linearly along the width direction of the electrode substrate to measure the width of at least two adjacent sub-electrode regions.

7. The cold pressing apparatus according to claim 6, characterized in that, The cold pressing device further includes a threaded rod, a guide rod, and a slider. The threaded rod and the guide rod are arranged side by side. The slider and the threaded rod are threaded together. The slider and the guide rod are slidably engaged. The driving component is connected to the threaded rod. The color mark sensor is connected to the slider. The driving component drives the slider and the color mark sensor to perform linear reciprocating motion through the threaded rod.

8. The cold pressing apparatus according to claim 6, characterized in that, The cold pressing device also includes a gear and a rack, which mesh with each other. The gear is connected to the drive component, and the color mark sensor is connected to the rack. The drive component drives the rack and the color mark sensor to perform linear reciprocating motion through the gear.

9. The cold pressing device according to claim 1, characterized in that, The cold pressing device also includes a frame, and the color mark sensor is fixedly mounted on the frame.

10. The cold pressing apparatus according to any one of claims 1-9, characterized in that, The cold pressing device also includes a tension roller located upstream of the slitting knife and used to apply tension to the electrode substrate.

11. A battery production system, characterized in that, Includes the cold pressing apparatus as described in any one of claims 1-10.

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