Electrode assembly coating apparatus and coating method

Abstract

The invention discloses coating equipment and a coating method of an electrode assembly, the electrode assembly comprises an electrode main body, the electrode main body has a first direction, a second direction and a third direction which are orthogonal to each other and comprises two main surfaces, two end surfaces and two side surfaces, and the coating equipment comprises a first positioning assembly and a first coating assembly. The first positioning assembly is arranged to position the electrode assembly and enable the two main faces to be exposed. The first coating assembly is arranged to position the coating film, wherein the coating film comprises two main coating areas and a connecting area. At least one of the first positioning assembly and the first wrapping assembly is arranged to be capable of moving relative to the other one, so that the connecting area makes contact with and wraps the first one of the two end faces, and the two main wrapping areas make contact with and wrap the exposed part of the corresponding one of the two main faces respectively. By means of the mode, continuous coating on multiple faces of the electrode assembly can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of battery assembly, in particular to a coating device and a coating method for an electrode assembly. Background Art

[0002] With the development of battery technology, batteries are applied in more and more fields and gradually replace traditional fossil energy in the field of automotive power. A battery can store chemical energy and convert the chemical energy into electrical energy controllably. In a recyclable battery, after discharging, the active substances can be activated by charging and continue to be used.

[0003] A battery often has an electrode assembly and a coating film. The coating film has an insulating function and can be used to coat the electrode assembly. During the production process of the battery, it is necessary to use a coating device to coat the coating film on the electrode assembly. However, the existing coating devices have single actions and cannot meet the coating requirements for continuously coating multiple surfaces of the electrode assembly. Summary of the Invention

[0004] In view of the above problems, the present application provides a coating device and a coating method for an electrode assembly, which can achieve continuous coating of multiple surfaces of the electrode assembly.

[0005] In a first aspect, the present application provides a coating device for an electrode assembly. The electrode assembly includes an electrode body, the electrode body has a first direction, a second direction, and a third direction that are orthogonal to each other, and includes two main surfaces that are arranged opposite to each other along the first direction, two end surfaces that are arranged opposite to each other along the second direction, and two side surfaces that are arranged opposite to each other along the third direction. The coating device includes a first positioning component and a first coating component. The first positioning component is configured to position the electrode assembly and keep at least part of the two main surfaces exposed respectively. The first coating component is configured to position the coating film, where the coating film includes two main coating regions that are spaced apart from each other and a connection region connected between the two main coating regions. At least one of the first positioning component and the first coating component is configured to be movable relative to the other, so that the connection region contacts and coats the first of the two end surfaces, and the two main coating regions respectively contact and coat the exposed parts of the corresponding one of the two main surfaces.

[0006] In the above manner, the relative position relationship between the electrode assembly and the coating film can be adjusted. When the coating film coats the two main surfaces of the electrode body and the first of the two end surfaces, continuous coating of the two main surfaces and the first of the two end surfaces can be achieved, the stability of the coating process can be improved, and the coating action can be made more concise and smooth.

[0007] In some embodiments, the relative movement between the first positioning component and the first covering component is set such that the contact time of the connection area with the first of the two end faces is earlier than the contact time of the two main covering areas with the corresponding one of the two main faces respectively.

[0008] In the above manner, after the action of covering the first of the two end faces by the connection area, the action of covering the two main faces by the two main covering areas respectively is carried out, which reduces the difficulty of the covering process and is beneficial to simplifying the structure of the covering equipment.

[0009] In some embodiments, the relative movement between the first positioning component and the first covering component is set such that the covering processes of the two main covering areas for the corresponding one of the two main faces are at least partially synchronous.

[0010] In the above manner, it is beneficial to simplify the covering process and improve the covering efficiency.

[0011] In some embodiments, before the first of the two end faces contacts the connection area, the first covering component is set such that the connection area and the two main covering areas are coplanar with each other.

[0012] In the above manner, it is convenient to stack and store the covering film, which can reduce the occupied space of the covering film and facilitate the feeding of the covering film.

[0013] In some embodiments, the first covering component is set such that the connection area is in a suspended state, and the relative movement between the first positioning component and the first covering component is set such that the first of the two end faces contacts the connection area in the suspended state.

[0014] In the above manner, the interference received during the process of the connection area covering the first of the two end faces can be reduced, which is beneficial to improving the fitting degree of the connection area with the first of the two end faces and the covering effect of the connection area on the first of the two end faces.

[0015] In some embodiments, the electrode assembly further includes a pole ear protruding from the first of the two end faces, an opening is provided on the connection area, and the pole ear is set to pass through the opening along with the relative movement between the first positioning component and the first covering component.

[0016] In the above manner, the opening can form an avoidance for the pole ear, which can reduce the interference of the pole ear on the covering process, thereby improving the covering effect of the covering film on the first of the two end faces.

[0017] In some embodiments, at least one of the first positioning component and the first covering component is arranged to move along a second direction, so that the electrode component and the covering film approach each other along the second direction. After the first one of the two end faces contacts the connection area, the electrode component continues to move along the second direction relative to the ends of the two main covering areas away from the connection area. The first covering component is further arranged to move along a first direction, so that the ends of the two main covering areas approach each other along the first direction, and then the two main covering areas contact and cover the exposed parts of the corresponding one of the two main faces.

[0018] In the above way, the covering film can be smoothly connected between covering the first one of the two end faces and covering the two main faces, simplifying the operation of the covering process and being beneficial to improving the covering efficiency.

[0019] In some embodiments, the first positioning component includes an electrode fixture, and the electrode fixture is arranged to clamp and fix the electrode body from the outside of the two sides along a third direction, or is arranged to clamp and fix the electrode body from the outside of the two main faces along a first direction.

[0020] In the above way, by arranging the electrode fixture to clamp and fix the electrode body from the outside of the two sides along the third direction, the electrode fixture can avoid the two main faces of the electrode body, which is beneficial to increasing the area of the exposed parts of the two main faces and improving the covering effect on the two main faces. By arranging the electrode fixture to clamp and fix the electrode body from the outside of the two main faces along the first direction, it is beneficial to improve the stability of the electrode fixture clamping and fixing the electrode body.

[0021] In some embodiments, the first positioning component includes an electrode driving mechanism, and the electrode driving mechanism is arranged to drive the electrode fixture to move along the second direction towards the side where the covering film is located, so that after the first one of the two end faces contacts the connection area, the first one of the two end faces and the connection area continue to move synchronously along the second direction.

[0022] In the above way, the covering film can be smoothly connected between covering the first one of the two end faces and covering the two main faces, simplifying the operation of the covering process and being beneficial to improving the covering efficiency.

[0023] In some embodiments, the electrode driving mechanism includes an electrode driving motor, a first electrode bracket and a second electrode bracket. The electrode driving motor is arranged on the first electrode bracket, and the electrode driving motor is arranged to drive the second electrode bracket to move relative to the first electrode bracket along the second direction. The electrode fixture is arranged on the second electrode bracket and includes an electrode jaw and an electrode clamping cylinder, and the electrode clamping cylinder is arranged to drive the electrode jaw to clamp and fix the electrode body.

[0024] In the above way, it is beneficial to the stable movement of the electrode component and can improve the accuracy of positioning the electrode component.

[0025] In some embodiments, the first covering assembly includes two first sub-covering assemblies arranged at intervals from each other. Each first sub-covering assembly respectively includes a film clamp and a first film driving mechanism. The two film clamps respectively clamp and fix the two ends of the covering film away from the connection area. The first film driving mechanism drives the two film clamps to approach each other along the first direction, so that the area of the main covering area not clamped by the film clamps can be bent relative to the connection area toward the corresponding main surface.

[0026] In the above manner, by arranging the two film clamps to respectively clamp and fix the two ends of the covering film away from the connection area, it is convenient to control the movement of the main covering area, which is beneficial for the area of the main covering area not clamped by the film clamps to remain in an extended state, facilitating the action of covering the main surface by the main covering area, thereby improving the covering effect of the main covering area on the main surface.

[0027] In some embodiments, the first film driving mechanism includes a first film driving motor, a first film support, and a second film support. The first film driving motor is arranged on the first film support and is configured to drive the second film support to move relative to the first film support along the first direction. The film clamp is arranged on the second film support and includes a film clamping jaw and a film clamping cylinder. The film clamping cylinder is configured to drive the film clamping jaw to clamp and fix the covering film.

[0028] In the above manner, it is beneficial for the stable movement of the covering film and can improve the accuracy of positioning the covering film.

[0029] In some embodiments, each first sub-covering assembly further respectively includes a second film driving mechanism. The two second film driving mechanisms respectively drive the corresponding film clamps to rotate, so that the movement trend of the area of the covering film clamped by the film clamps relative to the connection area is consistent with the bending trend of the unclamped area of the main covering area relative to the connection area.

[0030] In the above manner, the area of the covering film clamped by the film clamps can be closer to the electrode body, facilitating the covering of the area of the covering film clamped by the film clamps on the electrode body.

[0031] In some embodiments, the first film driving mechanism includes a first film driving motor, a first film support, and a second film support. The first film driving motor is arranged on the first film support and is configured to drive the second film support to move relative to the first film support along the first direction. The second film driving mechanism includes a second film driving motor. The second film driving motor is arranged on the second film support and drives the film clamp to rotate. The film clamp includes a film clamping jaw and a film clamping cylinder. The film clamping cylinder is configured to drive the film clamping jaw to clamp and fix the covering film.

[0032] In the above manner, the movement freedom of the covering film can be improved, and the covering effect can be enhanced.

[0033] In some embodiments, each first sub-coating assembly further includes a third film driving mechanism, and the two third film driving mechanisms drive the corresponding film clamps to move towards the side where the electrode body is located along the second direction respectively. Alternatively, the first positioning assembly includes an electrode clamp and an electrode driving mechanism. The electrode clamp is configured to clamp and fix the electrode body, and the electrode driving mechanism is configured to drive the electrode assembly to move towards the side where the coating film is located along the second direction, so that after the first of the two end faces contacts the connection area, the first of the two end faces and the connection area continue to move synchronously along the second direction, and the third film driving mechanism drives the corresponding film clamp to move away from the electrode body along the second direction after the first of the two end faces contacts the connection area.

[0034] In the above manner, the projections of the two main coating areas on the corresponding main surfaces along the first direction can gradually cover the exposed part of the main surface, thus facilitating the coating of the main surface by the main coating areas.

[0035] In some embodiments, the first film driving mechanism includes a first film driving motor, a first film support, and a second film support. The first film driving motor is arranged on the first film support and is configured to drive the second film support to move relative to the first film support along the first direction. The third film driving mechanism includes a third film driving motor and a third film support. The third film driving motor is arranged on the second film support and drives the third film support to move relative to the second film support along the second direction. The second film driving mechanism includes a second film driving motor. The second film driving motor is arranged on the third film support and drives the film clamp to rotate. The film clamp includes film clamping jaws and a film clamping cylinder, and the film clamping cylinder is configured to drive the film clamping jaws to clamp and fix the coating film.

[0036] In the above manner, the movement freedom of the coating film can be further improved, and the coating effect can be enhanced.

[0037] In some embodiments, the coating device further includes a second positioning assembly, and the second positioning assembly is configured to clamp and fix the coating film and the electrode body from the outside of the two main coating areas.

[0038] In the above manner, the detachment of the main coating area from the main surface of the electrode body can be restricted, and the stability of the coating of the main surface of the electrode body by the main coating area can be improved.

[0039] In some embodiments, the second positioning assembly is a carrying jig that can rotate synchronously with the coating film and the electrode body.

[0040] In the above manner, the transfer of the coating film and the electrode body between different workstations can be facilitated, and the stability of the coating process of the main coating film on the electrode body can be improved.

[0041] In some embodiments, the first positioning assembly is configured to insert the electrode body and the coating film into the second positioning assembly along the second direction.

[0042] In the above manner, the first positioning component and the second positioning component can alternately position the electrode component, enabling the movement of the electrode component between different workstations to be smoother. At the same time, it can simplify the operation and structure of the second positioning component for positioning the electrode component, which is beneficial to improving the coating efficiency.

[0043] In some embodiments, each second positioning component includes a fixed bracket, an opening and closing mechanism, and two limiting members. The two limiting members are movably arranged on the fixed bracket along a first direction, and a limiting gap is formed therebetween for the electrode body and the coating film to be inserted. The opening and closing mechanism is configured to drive the two limiting members to approach or separate from each other.

[0044] In the above manner, it is convenient for the electrode body and the coating film to be inserted into the limiting gap, and at the same time, the clamping effect on the electrode body and the coating film can be improved.

[0045] In some embodiments, each opening and closing mechanism includes an elastic member and an opening mechanism. The elastic member is arranged between the two limiting members and is configured to drive the two limiting members to approach each other through its own elasticity. The opening mechanism is configured to drive the two limiting members to separate from each other.

[0046] In the above manner, by providing the elastic member, the second positioning component can adaptively adjust the clamping force on the electrode body and the coating film.

[0047] In some embodiments, the opening and closing mechanism includes a rotating member, and both ends of the rotating member are respectively connected to the two limiting members. The middle region of the rotating member is configured to be rotatably connected to the fixed bracket, and the rotating member is further configured to drive the other limiting member to move in the opposite direction when the first of the two limiting members moves along the first direction.

[0048] In the above manner, by providing the rotating member, the two limiting members can achieve synchronous movement and opposite movement directions.

[0049] In some embodiments, the coating film includes a side coating region connected to the main coating region, and the coating device further includes a second coating component configured to drive the side coating region to contact and coat on the side surface.

[0050] In the above manner, by providing the second coating component to coat the side coating region on the side surface, the coating effect of the coating film on the electrode body can be improved.

[0051] In some embodiments, the second covering assembly includes a side pressing plate, a first pressing plate transmission mechanism, and a second pressing plate transmission mechanism. The first pressing plate transmission mechanism is configured to drive the side pressing plate in a first direction so that the side pressing plate pushes the side covering area to bend towards the side relative to the main covering area. The second pressing plate transmission mechanism is configured to drive the side pressing plate in a third direction so that the side pressing plate presses the side covering area against the side surface.

[0052] In the above manner, the actions of bending the side covering area by the second covering assembly and covering the side covering area on the side surface can be smoothly connected, which is beneficial to simplifying the actions and structure of the second covering assembly and improving the covering efficiency.

[0053] In some embodiments, the covering film includes an end covering area connected to the main covering area. The second covering assembly is arranged to drive the end covering area to contact and cover the second one of the two end surfaces.

[0054] In the above manner, the covering effect of the covering film on the electrode body can be improved.

[0055] In some embodiments, the second covering assembly includes an end surface pressing plate, a first pressing plate transmission mechanism, and a third pressing plate transmission mechanism. The first pressing plate transmission mechanism is configured to drive the end surface pressing plate in a first direction so that the end surface pressing plate pushes the end covering area to bend towards the second one of the two end surfaces relative to the main covering area. The third pressing plate transmission mechanism is configured to drive the end surface pressing plate in a second direction so that the end surface pressing plate presses the end covering area against the second one of the two end surfaces.

[0056] In the above manner, when the end surface pressing plate moves close to the electrode body in the second direction, it can press the end covering area against the second one of the two end surfaces, so that the end covering area forms a covering on the second one of the two end surfaces.

[0057] In some embodiments, the first pressing plate transmission mechanism includes a pressing plate transmission motor, a first pressing plate support, and a second pressing plate support. The pressing plate transmission motor is arranged on the first pressing plate support and drives the second pressing plate support to move relative to the first pressing plate support. The second pressing plate transmission mechanism includes a first pressing plate cylinder. The first pressing plate cylinder is arranged on the second pressing plate support, and the first pressing plate cylinder drives the side pressing plate to move relative to the second pressing plate support. The third pressing plate transmission mechanism includes a second pressing plate cylinder. The second pressing plate cylinder is arranged on the second pressing plate support, and the second pressing plate cylinder drives the end surface pressing plate to move relative to the second pressing plate support.

[0058] In the above manner, the freedom of movement of the side pressing plate and the end surface pressing plate can be improved, which is beneficial to improving the covering effect.

[0059] In some embodiments, the coating film further includes a side coating area and an end coating area connected to the main coating area, wherein the side coating area is coated on the side surface, and the end coating area is coated on the second of the two end surfaces. The coating device further includes a first tape attaching assembly for attaching a first tape to the electrode assembly. The first tape includes a first part and a second part connected to each other. The first tape attaching assembly is configured to attach the first part of the first tape to the side coating area and the second part of the first tape to the end coating area at the corner formed by the side surface and the second of the two end surfaces.

[0060] In the above manner, the first tape can connect the side coating area and the end coating area together, so that the side coating area and the end coating area can be fixed relative to the electrode body, thereby improving the firmness of the coating of the coating film on the electrode body.

[0061] In some embodiments, the first tape attaching assembly includes a first unwinding mechanism, a first tape pulling mechanism, and a first cutting mechanism. The first unwinding mechanism is configured to place and release a first tape roll. The first tape pulling mechanism is configured to clamp and pull the leading end of the released portion of the first tape roll. The first cutting mechanism is configured to cut out the first tape from the released portion of the first tape roll.

[0062] In the above manner, it is beneficial to realize the automatic supply of the first tape.

[0063] In some embodiments, the first tape pulling mechanism includes a first tape clamping cylinder, a first tape pulling motor, and a first tape clamping member. The first tape clamping cylinder is used to drive the first tape clamping member to clamp the leading end of the released portion. The first tape pulling motor is used to drive the first tape clamping member to move to pull the released portion.

[0064] In the above manner, the released portion of the first tape roll can be extended, and the released portion of the first tape roll is stretched to facilitate cutting.

[0065] In some embodiments, the first unwinding mechanism and the first cutting mechanism are two corresponding sets. The first tape attaching assembly includes a switching mechanism, and the switching mechanism includes a reel support and a switching motor. The two sets of first unwinding mechanisms and first cutting mechanisms are arranged on the reel support. The switching motor drives the reel support to rotate around a predetermined rotation axis, so that the two sets of first unwinding mechanisms and first cutting mechanisms can be switched between a standby position and a working position for the first tape pulling mechanism and the first cutting mechanism to operate. The rotation axis is perpendicular to the plane where the released portion is located.

[0066] In the above manner, it is beneficial to quickly perform the reel changing operation of the first tape roll and improve the reel changing efficiency.

[0067] In some embodiments, the first tape attaching assembly includes a first tape picking mechanism for adsorbing and picking up the first tape. The first cutting mechanism includes a first pressing block, a first cutter, and a first cutting cylinder. The first pressing block and the first cutter are relatively fixedly arranged. The first cutting cylinder is configured to drive the first pressing block to press the release portion onto the first tape picking mechanism and drive the first cutter to cut out the first tape from the release portion.

[0068] In the above manner, the first pressing block can press and position the release portion, improving the stability of the cutting process.

[0069] In some embodiments, the first tape attaching assembly includes a first tape picking mechanism for adsorbing and picking up the first tape. The first tape picking mechanism includes a first tape picking member, a first tape picking motor, a second tape picking motor, a first tape picking bracket, and a second tape picking bracket. The first tape picking member is for adsorbing the first tape. The first tape picking motor is arranged on the first tape picking bracket and drives the second tape picking bracket to move to the side of the main surface of the release portion. The second tape picking motor is arranged on the second tape picking bracket and drives the first tape picking member to approach and move away from the plane where the release portion is located.

[0070] In the above manner, the degree of freedom of movement of the first tape picking member can be improved, facilitating the picking and transferring of the first tape.

[0071] In some embodiments, the first tape picking member includes a first sub-tape picking portion and a second sub-tape picking portion. The first sub-tape picking portion is for adsorbing the first part of the first tape and attaching it to the side covering area. The second sub-tape picking portion is for adsorbing the second part of the first tape and attaching it to the end covering area.

[0072] In the above manner, the coherence of the tape picking action and the tape attaching action can be improved.

[0073] In some embodiments, the first sub-tape picking portion is a telescopic member. The second tape picking motor drives the first tape picking member in the third direction. The first sub-tape picking portion presses the first part of the first tape onto the side covering area and contracts, enabling the second sub-tape picking portion to continue moving in the third direction and fit the end covering area, and then attaching the second part of the first tape to the end covering area. Alternatively, the second sub-tape picking portion is a telescopic member. The second tape picking motor drives the first tape picking member in the second direction. The second sub-tape picking portion presses the second part of the first tape onto the end covering area and contracts, enabling the first sub-tape picking portion to continue moving in the second direction and fit the side covering area, and then attaching the first part of the first tape to the side covering area.

[0074] In the above manner, the structural flexibility of the first tape picking member can be improved, enabling the first tape picking member to adaptively adjust its shape according to the shape of the electrode body, thus realizing diverse tape attaching actions.

[0075] In some embodiments, the first cutting mechanism is configured to cut out two first tapes from the release portion. The first tape attaching assembly includes a first tape picking mechanism for adsorbing and picking up the first tapes. The first tape picking mechanism includes a first tape picking member, a first tape picking motor, a second tape picking motor, a first tape picking bracket, a second tape picking bracket, a third tape picking bracket, and a tape separating cylinder. The number of the first tape picking members is two, and each adsorbs a corresponding first tape. The first tape picking motor is disposed on the first tape picking bracket and drives the second tape picking bracket to move to the side of the main surface of the release portion. The second tape picking motor is disposed on the second tape picking bracket and drives the third tape picking bracket and the two first tape picking members to approach and move away from the plane where the release portion is located. The tape separating cylinder is disposed on the third tape picking bracket and is configured to drive the two first tape picking members to move away from each other so that the two first tape picking members respectively correspond to two corners of the electrode assembly spaced apart in the third direction.

[0076] In the above manner, the first tape picking mechanism can adsorb and pick up two first tapes corresponding to each electrode assembly, and then realize attaching two first tapes correspondingly at two corners of the electrode assembly spaced apart in the third direction, thereby improving the tape attaching efficiency.

[0077] In some embodiments, the coating device further includes a second tape attaching assembly for attaching a second tape to the electrode assembly. The second tape includes a first portion and a second portion connected to each other. The second tape attaching assembly is configured to attach the first portion of the second tape to the main coating area and the second portion of the second tape to the side coating area at the corner formed by the side surface and the main surface.

[0078] In the above manner, the side coating area and the main coating area can be fixed relative to the electrode body, thereby improving the coating firmness of the coating film on the electrode body.

[0079] In some embodiments, the number of the first portions of the second tape is two and is located at both ends of the second portion of the second tape. The second tape attaching assembly is configured to attach the two first portions of the second tape to the corresponding one of the two main coating areas respectively.

[0080] In the above manner, the contact area between the second tape and the coating film can be increased, and the fixing effect on the side coating area can be improved.

[0081] In some embodiments, the second tape attaching assembly includes a second tape unwinding mechanism, a second tape pulling mechanism, and a second cutting mechanism. The second tape unwinding mechanism is configured to place and release a second tape roll. The second tape pulling mechanism is configured to clamp and pull the leading end of the release portion of the second tape roll. The second cutting mechanism is configured to cut out the second tape from the release portion of the second tape roll.

[0082] In the above manner, it is beneficial to achieve the automatic supply of the second tape.

[0083] In some embodiments, the second tape pulling mechanism includes a second tape clamping cylinder, a second tape pulling motor, and a second tape clamping member. The second tape clamping cylinder is used to drive the second tape clamping member to clamp the leading end of the release portion, and the second tape pulling motor is used to drive the second tape clamping member to move to pull the release portion.

[0084] In the above manner, the release portion of the second tape roll can be extended, and the release portion of the second tape roll is stretched to facilitate cutting.

[0085] In some embodiments, the second unwinding mechanism and the second cutting mechanism are two corresponding sets, and are arranged at intervals along the width direction of the release portion. The second tape attaching assembly includes a tape pulling support, a tape pulling position-changing cylinder, and a tape pulling position-changing support. The tape pulling position-changing cylinder is arranged on the tape pulling support, and the second tape pulling mechanism is arranged on the tape pulling position-changing support. The tape pulling position-changing cylinder is arranged to drive the tape pulling position-changing support to move along the interval direction between the two second unwinding mechanisms, so that the second tape pulling mechanism can be switched between the two sets of second unwinding mechanisms and the second cutting mechanism.

[0086] In the above manner, by providing two sets of second unwinding mechanisms and second cutting mechanisms, the interference of the tape roll changing operation of the second tape roll on the tape pulling process can be reduced, and the tape pulling efficiency can be improved. By arranging the tape pulling position-changing cylinder to drive the tape pulling position-changing support to move along the interval direction between the two second unwinding mechanisms, the position of the tape pulling mechanism can correspond to the position of a set of second unwinding mechanisms and second cutting mechanisms that are working, which is convenient for tape pulling operation.

[0087] In some embodiments, the second tape attaching assembly includes a second tape picking mechanism, and the second tape picking mechanism is used to adsorb and pick up the second tape. The second cutting mechanism includes a second pressing block, a second cutting knife, and a second cutting cylinder. The second pressing block and the second cutting knife are relatively fixedly arranged. The second cutting cylinder is arranged to drive the second pressing block to press the release portion onto the second tape picking mechanism, and drive the second cutting knife to cut out the second tape from the release portion.

[0088] In the above manner, the second pressing block can press and position the release portion, which can improve the stability of the cutting process.

[0089] In some embodiments, the second tape attaching assembly includes a second tape picking mechanism, and the second tape picking mechanism is used to adsorb and pick up the second tape. The second tape picking mechanism includes a second tape picking member, a fourth tape picking motor, and a fourth tape picking support. The second tape picking member is used to adsorb the second tape. The fourth tape picking motor is arranged on the fourth tape picking support, and drives the second tape picking member to move to the side of the main surface of the release portion, and drives the second tape picking member to approach and move away from the plane where the release portion is located.

[0090] In the above - mentioned manner, the degree of freedom of movement of the second glue - picking member can be improved, facilitating the picking and transferring of the second tape.

[0091] In some embodiments, the second glue - picking member includes a third sub - glue - picking portion and a fourth sub - glue - picking portion. The third sub - glue - picking portion is used to adsorb the first part of the second tape and attach it to the main covering area. The fourth sub - glue - picking portion is used to adsorb the second part of the second tape and attach it to the side covering area.

[0092] In the above - mentioned manner, the coherence of the glue - picking action and the glue - attaching action can be improved.

[0093] In some embodiments, the fourth sub - glue - picking portion is a telescopic member. The fourth glue - picking motor drives the second glue - picking member in the third direction. The fourth sub - glue - picking portion presses the second part of the second tape against the side covering area and contracts, so that the third sub - glue - picking portion can continue to move in the third direction and fit the main covering area, and then attach the first part of the second tape to the main covering area.

[0094] In the above - mentioned manner, the structural flexibility of the second glue - picking member can be improved, enabling the second glue - picking member to adaptively adjust its shape according to the shape of the electrode body, thus realizing diverse glue - attaching actions.

[0095] In some embodiments, the second unwinding mechanism and the second cutting mechanism are two corresponding sets, and are arranged at intervals along the width direction of the released part. The second glue - picking mechanism includes a glue - picking position - changing air cylinder and a glue - picking position - changing support. The glue - picking position - changing air cylinder is arranged on the fourth glue - picking support, and the second glue - picking member is arranged on the glue - picking position - changing support. The glue - picking position - changing air cylinder is arranged to drive the glue - picking position - changing support to move along the interval direction between the two second unwinding mechanisms, so that the second glue - picking member can be switched between the two sets of second unwinding mechanisms and the second cutting mechanism.

[0096] In the above - mentioned manner, by arranging the glue - picking position - changing air cylinder to drive the glue - picking position - changing support to move along the interval direction between the two second unwinding mechanisms, the position of the second glue - picking member can correspond to the position of the set of second unwinding mechanisms and the second cutting mechanism that is working, facilitating the glue - picking operation.

[0097] In some embodiments, the second tape - attaching assembly includes a third positioning assembly. The third positioning assembly includes a main pressing air cylinder, a main pressing member, a side pressing air cylinder, and a side pressing member. The main pressing air cylinder is arranged to drive the main pressing member to press the main covering area and the main surface, and the side pressing air cylinder is arranged to drive the side pressing member to press the side covering area and the side surface.

[0098] In the above - mentioned manner, the stability of the glue - attaching process can be improved.

[0099] In some embodiments, the third positioning assembly includes a rotating motor and a rotating bracket. The main pressing cylinder, the main pressing member, the side pressing cylinder, and the side pressing member are disposed on the rotating bracket, and the rotating motor is configured to drive the rotating bracket to rotate. The axis of rotation of the rotating bracket is parallel to the second direction.

[0100] In the above manner, the degree of freedom of movement of the electrode assembly can be improved, facilitating the pasting of the second tape at different positions of the electrode assembly.

[0101] In some embodiments, the second tape attaching assembly includes two second unwinding mechanisms. The third positioning assembly includes a shifting motor and a shifting bracket, and the main pressing cylinder, the main pressing member, the side pressing cylinder, the side pressing member, the rotating motor, and the rotating bracket are disposed on the shifting bracket. The shifting motor is configured to drive the shifting bracket to move along the interval direction between the two second unwinding mechanisms.

[0102] In the above manner, by configuring the shifting motor to drive the shifting bracket to move along the interval direction between the two second unwinding mechanisms, the position of the electrode assembly can correspond to the position of a set of second unwinding mechanisms and second cutting mechanisms that are working, facilitating the gluing operation.

[0103] In some embodiments, the electrode body includes two electrode modules stacked on each other along the first direction, and each electrode module includes a positive electrode tab, a separator, and a negative electrode tab arranged in sequence.

[0104] In the above manner, it is beneficial to improve the space utilization rate of the electrode assembly and increase the energy storage density of the electrode assembly.

[0105] In a second aspect, the present application provides a method for covering an electrode assembly. The electrode assembly includes an electrode body having a first direction, a second direction, and a third direction that are orthogonal to each other, and including two main surfaces facing away from each other along the first direction, two end surfaces facing away from each other along the second direction, and two side surfaces facing away from each other along the third direction. The covering method includes: positioning the electrode assembly using a first positioning assembly and keeping at least a part of the two main surfaces exposed respectively. Positioning a covering film using a first covering assembly, where the covering film includes two main covering regions arranged at intervals and a connecting region connecting the two main covering regions. Controlling at least one of the first positioning assembly and the first covering assembly to move relative to the other so that the connecting region contacts and covers the first of the two end surfaces, and the two main covering regions respectively contact and cover the corresponding one of the two main surfaces from the exposed part of the first positioning assembly.

[0106] In some embodiments, controlling the movement of at least one of the first positioning assembly and the first covering assembly relative to the other includes: controlling the relative movement of the first positioning assembly and the first covering assembly such that the contact time of the connection area with the first of the two end faces is earlier than the contact time of the two main covering areas with the corresponding one of the two main faces, and / or controlling the relative movement of the first positioning assembly and the first covering assembly such that the covering processes of the two main covering areas on the corresponding one of the two main faces are at least partially synchronized.

[0107] In some embodiments, controlling the movement of at least one of the first positioning assembly and the first covering assembly relative to the other includes: controlling at least one of the first positioning assembly and the first covering assembly to move along a second direction such that the electrode assembly and the covering film approach each other along the second direction, and after the first of the two end faces contacts the connection area, the electrode assembly continues to move along the second direction relative to the ends of the two main covering areas away from the connection area. Controlling the first covering assembly to move along a first direction such that the ends of the two main covering areas approach each other along the first direction, so that the two main covering areas contact and cover the exposed portions of the corresponding one of the two main faces.

[0108] In some embodiments, the electrode assembly includes an ear portion, the ear portion protruding from the first of the two end faces, and an opening is provided on the connection area. Positioning the covering film using the first covering assembly includes: positioning the electrode assembly using the first positioning assembly such that the ear portion faces the connection area. Controlling the movement of at least one of the first positioning assembly and the first covering assembly relative to the other includes: controlling the relative movement of the first positioning assembly and the first covering assembly such that the ear portion passes through the opening with the relative movement between the first positioning assembly and the first covering assembly, and the connection area contacts and covers the first of the two end faces.

[0109] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Description of the Drawings

[0110] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0111] Figure 1 Schematic structural diagram of a vehicle to which an electrode assembly according to one or more embodiments is applied;

[0112] Figure 2 Schematic exploded view of a battery where an electrode assembly is located according to one or more embodiments;

[0113] Figure 3 Schematic exploded view of a battery cell where an electrode assembly is located according to one or more embodiments;

[0114] Figure 4 Schematic partial view of an electrode assembly according to one or more embodiments;

[0115] Figure 5 Schematic view of a first positioning component and a first covering component driving a covering film and an electrode assembly according to one or more embodiments;

[0116] Figure 6 Schematic simplified view of a first positioning component and a first covering component driving a covering film and an electrode assembly according to one or more embodiments;

[0117] Figure 7 Schematic view of the process of a covering film covering an electrode assembly according to one or more embodiments;

[0118] Figure 8 Schematic view of a first positioning component according to one or more embodiments;

[0119] Figure 9 Schematic partial view of a first covering component according to one or more embodiments;

[0120] Figure 10 Schematic view of a second positioning component positioning an electrode assembly according to one or more embodiments;

[0121] Figure 11 Schematic bottom view of a second positioning component according to one or more embodiments;

[0122] Figure 12 Schematic view of a second covering component driving a covering film and an electrode assembly according to one or more embodiments;

[0123] Figure 13 Schematic view of a second covering component according to one or more embodiments;

[0124] Figure 14 For Figure 12 Schematic partial view of the second covering component shown driving a covering film and an electrode assembly;

[0125] Figure 15 For Figure 12 Schematic view of the covering film and the electrode assembly shown;

[0126] Figure 16Schematic structural diagram of a coating device according to one or more embodiments;

[0127] Figure 17 Schematic structural diagram of a coating film and an electrode assembly with a first tape and a second tape attached according to one or more embodiments;

[0128] Figure 18 Schematic structural diagram of a first tape attachment assembly according to one or more embodiments;

[0129] Figure 19 Schematic structural diagram of the cooperation of a first unwind mechanism, a first glue feeding mechanism, and a first tape roll according to one or more embodiments;

[0130] Figure 20 Schematic structural diagram of a first glue picking mechanism according to one or more embodiments;

[0131] Figure 21 Partial schematic structural diagram of a first glue pulling mechanism according to one or more embodiments;

[0132] Figure 22 Schematic structural diagram of a first cutting mechanism according to one or more embodiments;

[0133] Figure 23 Schematic structural diagram of a first glue picking member adsorbing a first tape according to one or more embodiments;

[0134] Figure 24 Schematic structural diagram of the cooperation of a second tape attachment assembly and an electrode assembly according to one or more embodiments;

[0135] Figure 25 Schematic structural diagram of the cooperation of a second unwind mechanism, a second cutting mechanism, a second tape roll, and a second glue feeding mechanism according to one or more embodiments;

[0136] Figure 26 Schematic structural diagram of a second glue pulling mechanism according to one or more embodiments;

[0137] Figure 27 Schematic structural diagram of a second glue picking mechanism adsorbing a second tape according to one or more embodiments;

[0138] Figure 28 For Figure 27 Partial schematic structural diagram of the second glue picking mechanism adsorbing the second tape shown;

[0139] Figure 29 Schematic structural diagram of a second cutting mechanism according to one or more embodiments;

[0140] Figure 30Schematic structural diagram of a third positioning component for positioning an electrode component according to one or more embodiments;

[0141] Figure 31 Schematic structural diagram of an electrode component according to one or more embodiments.

[0142] Reference numerals in the specific embodiments are as follows:

[0143] 1000a vehicle;

[0144] 100a battery; 200a controller; 300a motor;

[0145] 10a box body; 11a first sub-box body; 12a second sub-box body; 101b accommodation space; 1 battery cell;

[0146] 100 housing; 110 accommodation housing; 112 open end; 120 end cap; 200 electrode component;

[0147] 201 pole ear; 210 electrode body; 211 main surface; 212a the first of the two end faces; 212b the second of the two end faces; 212 end face; 213 side face; 220 electrode module; 221 positive electrode plate; 222 separator; 223 negative electrode plate; 230 fixing member;

[0148] 300 coating equipment; 301 coating film feeding mechanism; 302 electrode component discharging mechanism; 303 fixture conveying line; 304 manipulator track; 305 dust removal mechanism; 306 flipping mechanism;

[0149] 310 first positioning component; 311 electrode fixture; 312 electrode driving mechanism; 313 electrode clamping cylinder; 3131 electrode jaw; 314 electrode driving motor; 3141 first electrode support; 3142 second electrode support;

[0150] 330 first coating component; 331 first sub-coating component; 332 film fixture; 333 first film driving mechanism; 334 second film driving mechanism; 335 third film driving mechanism; 336 film clamping cylinder; 337 first film driving motor; 3371 first film support; 338 film jaw; 339 fourth film support; 340 second film driving motor; 341 third film driving motor; 342 second film support; 343 third film support;

[0151] 350 second positioning component; 351 fixing bracket; 353 limiting member; 354 limiting gap; 355 elastic member; 356 hook plate; 357 rotating member;

[0152] 360 Third positioning component; 361 Main pressing cylinder; 362 Main pressing member; 363 Side pressing cylinder; 364 Side pressing member; 365 Rotating motor; 366 Rotating bracket; 367 Shifting motor; 368 Shifting bracket;

[0153] 370 Second covering component; 371 Side pressing plate; 372 First pressing plate transmission mechanism; 373 Second pressing plate transmission mechanism; 374 End face pressing plate; 3741 End limit block; 3711 Side limit block; 375 Third pressing plate transmission mechanism; 376 First pressing plate cylinder; 3761 Second pressing plate cylinder; 377 Pressing plate transmission motor; 378 First pressing plate bracket; 379 Second pressing plate bracket;

[0154] 380 First tape attaching component; 381 First unwinding mechanism; 382 First tape pulling mechanism; 3821 First tape clamping cylinder; 3822 First tape pulling motor; 3823 First tape clamping member; 383 First cutting mechanism; 3831 First pressing block; 3832 First cutting knife; 3833 First cutting cylinder; 384 First tape roll; 385 Switching mechanism; 3851 Tape roll bracket; 3852 Switching motor; 386 First glue taking mechanism; 3861 First glue taking member; 3862 First glue taking motor; 3863 Second glue taking motor; 3864 First glue taking bracket; 3865 Second glue taking bracket; 3866 First sub - glue taking part; 3867 Second sub - glue taking part; 3868 Third glue taking bracket; 3869 Glue distributing cylinder; 387 First glue feeding mechanism;

[0155] 390 Second tape attaching component; 391 Second unwinding mechanism; 392 Second tape pulling mechanism; 3921 Second tape clamping cylinder; 3922 Second tape pulling motor; 3923 Second tape clamping member; 393 Second cutting mechanism; 3931 Second pressing block; 3932 Second cutting knife; 3933 Second cutting cylinder; 394 Tape pulling bracket; 3941 Tape pulling position - changing cylinder; 3942 Tape pulling position - changing bracket; 395 Second glue taking mechanism; 3951 Second glue taking member; 3952 Fourth glue taking motor; 3953 Fourth glue taking bracket; 3954 Third sub - glue taking part; 3955 Fourth sub - glue taking part; 3956 Glue taking position - changing cylinder; 3957 Glue taking position - changing bracket; 396 Second tape roll; 397 Second glue feeding mechanism;

[0156] 400 Coating film; 410 Main coating area; 420 Connection area; 421 Opening; 430 Side coating area; 440 End coating area;

[0157] 511 First part of the first tape; 512 Second part of the first tape; 510 First tape; 521 First part of the second tape; 522 Second part of the second tape; 520 Second tape;

[0158] D1 The first direction; D2 The second direction; D3 The third direction; D4 The width direction of the release part; D5 The interval direction between the two second unwinding mechanisms; D6 The thickness direction of the release part. Detailed implementation

[0159] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0160] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0161] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0162] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0163] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0164] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0165] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0166] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0167] With the development of battery technology, batteries are applied in more and more fields and gradually replace traditional fossil energy in the field of automotive power. A battery can store chemical energy and controllably convert the chemical energy into electrical energy. In a recyclable battery, after discharging, the active substances can be activated by charging and continue to be used.

[0168] Batteries are often provided with an electrode assembly and a coating film. The coating film has an insulating function and can be used to coat the electrode assembly. During the production process of the battery, it is necessary to use coating equipment to coat the coating film on the electrode assembly. However, the existing coating equipment has a single action and cannot meet the coating requirements for continuously coating multiple surfaces of the electrode assembly.

[0169] In order to meet the coating requirements for continuously coating multiple surfaces of the electrode assembly, a first positioning assembly is provided to position the electrode assembly, so that the position and posture of the electrode assembly can be kept stable and controlled. A first coating assembly is provided to position the coating film, so that the position and posture of the two main coating areas and the connection area can be kept stable and controlled. At least one of the first positioning assembly and the first coating assembly is set to drive the electrode assembly and the coating film to move relative to each other, so that the relative position relationship between the two main surfaces and the two coating areas can be adjusted, and the relative position relationship between the first of the two end surfaces and the connection area can be adjusted, so as to realize the continuous coating of the two main surfaces and the first of the two end surfaces of the electrode assembly.

[0170] Based on the above considerations, the present application provides a coating device and a coating method for an electrode assembly. The electrode assembly includes an electrode body having a first direction, a second direction, and a third direction that are orthogonal to each other, and includes two main surfaces disposed opposite to each other along the first direction, two end surfaces disposed opposite to each other along the second direction, and two side surfaces disposed opposite to each other along the third direction. The coating device includes a first positioning assembly and a first coating assembly. The first positioning assembly is configured to position the electrode assembly and keep at least part of the two main surfaces exposed respectively. The first coating assembly is configured to position the coating film, where the coating film includes two main coating regions disposed at intervals from each other and a connection region connecting the two main coating regions. At least one of the first positioning assembly and the first coating assembly is configured to be movable relative to the other, so that the connection region contacts and coats the first of the two end surfaces, and the two main coating regions respectively contact and coat the exposed portions of the corresponding one of the two main surfaces. In this way, the relative position relationship between the electrode assembly and the coating film can be adjusted, and when the coating film coats the two main surfaces and the first of the two end surfaces of the electrode body, continuous coating of the two main surfaces and the first of the two end surfaces can be achieved, the stability of the coating process can be improved, and the coating action can be made more concise and smooth.

[0171] The coating device and the coating method for the electrode assembly disclosed in the embodiments of the present application are used to coat a coating film on the electrode assembly. The electrode assembly and the coating film are disposed in a battery, and the battery can be used in an electrical device using the battery as a power source or various energy storage systems using the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0172] For the convenience of description in the following embodiments, a vehicle 1000a, which is an electrical device according to an embodiment of the present application, is taken as an example for description.

[0173] Please refer to Figure 1, Vehicle 1000a can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 100a is disposed inside the vehicle 1000a, and the battery 100a can be disposed at the bottom, head, or tail of the vehicle 1000a. The battery 100a can be used to supply power to the vehicle 1000a. For example, the battery 100a can serve as the operating power source of the vehicle 1000a. The vehicle 1000a can also include a controller 200a and a motor 300a. The controller 200a is used to control the battery 100a to supply power to the motor 300a. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000a.

[0174] In some embodiments of the present application, the battery 100a can not only serve as the operating power source of the vehicle 1000a, but also serve as the driving power source of the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0175] In some embodiments, the battery 100a can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0176] The battery 100a mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 1 to provide higher voltage and capacity.

[0177] In the embodiments of the present application, the battery cell 1 can be a secondary battery. A secondary battery refers to a battery cell 1 that can be activated by charging after discharging to continue use. Each battery cell 1 can also be a primary battery.

[0178] The battery cell 1 includes but is not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc. The battery cell 1 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0179] In some embodiments, the battery 100a can be a battery module. When there are multiple battery cells 1, the multiple battery cells 1 are arranged and fixed to form a battery module.

[0180] In some embodiments, please refer to Figure 2 , the battery 100a can be a battery pack. The battery pack includes a box body 10a and battery cells 1, and the battery cells 1 or the battery module are accommodated in the box body 10a.

[0181] In some embodiments, the box body 10a can be part of the chassis structure of the vehicle 1000a. For example, a part of the box body 10a can form at least a part of the floor of the vehicle 1000a, or a part of the box body 10a can form at least a part of the cross beams and longitudinal beams of the vehicle 1000a.

[0182] Please refer to Figure 2 , the battery 100a includes a box body 10a and battery cells 1, and the battery cells 1 are accommodated in the box body 10a. Among them, the box body 10a is used to provide an accommodation space 101b for the battery cells 1, and the box body 10a can adopt various structures. In some embodiments, the box body 10a can include a first sub-box body 11a and a second sub-box body 12a. The first sub-box body 11a and the second sub-box body 12a cover each other, and the first sub-box body 11a and the second sub-box body 12a jointly define an accommodation space 101b for accommodating the battery cells 1. The second sub-box body 12a can be a hollow structure with one end open, and the first sub-box body 11a can be a plate-like structure. The first sub-box body 11a covers the open side of the second sub-box body 12a so that the first sub-box body 11a and the second sub-box body 12a jointly define the accommodation space 101b; the first sub-box body 11a and the second sub-box body 12a can also both be hollow structures with one side open, and the open side of the first sub-box body 11a covers the open side of the second sub-box body 12a. Of course, the box body 10a formed by the first sub-box body 11a and the second sub-box body 12a can be of various shapes, such as a cylinder, a cuboid, etc.

[0183] In the battery 100a, there can be multiple battery cells 1, and the multiple battery cells 1 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 1. The multiple battery cells 1 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 1 is accommodated in the box body 10a; of course, the battery 100a can also be that multiple battery cells 1 are first connected in series, in parallel, or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 10a. The battery 100a can also include other structures. For example, the battery 100a can also include a busbar component for realizing the electrical connection among the multiple battery cells 1.

[0184] Please refer to Figure 3 , a battery cell 1 refers to the smallest unit that makes up a battery. In this embodiment, a cylindrical battery cell 1 is taken as an example for description. As Figure 3 shown, the battery cell 1 includes a housing 100, an electrode assembly 200, and other functional components.

[0185] In some embodiments, the housing 100 is used to encapsulate components such as the electrode assembly 200 and the electrolyte. The housing 100 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum plastic film, etc.

[0186] The housing 100 may include an end cap 120 and a receiving shell 110. The end cap 120 refers to a component that covers the opening of the receiving shell 110 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 120 can be adapted to the shape of the receiving shell 110 to cooperate with the receiving shell 110. Optionally, the end cap 120 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 120 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 1 to have higher structural strength and improved safety performance. Functional components such as pole posts can be provided on the end cap 120. The pole post can be used for electrical connection with the electrode assembly 200 to output or input the electrical energy of the battery cell 1. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold can also be provided on the end cap 120. The material of the end cap 120 can also be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component can be provided on the inner side of the end cap 120. The insulating component can be used to isolate the electrical connection components in the receiving shell 110 from the end cap 120 to reduce the risk of short circuit. Exemplarily, the insulating component can be plastic, rubber, etc.

[0187] The receiving shell 110 is a component used to cooperate with the end cap 120 to form the internal environment of the battery cell 1. Among them, the formed internal environment can be used to accommodate the electrode assembly 200, the electrolyte, and other components. The receiving shell 110 and the end cap 120 can be independent components. After the receiving shell 110 and the end cap 120 are connected, the internal environment of the battery cell 1 can be formed. Without limitation, the end cap 120 and the receiving shell 110 can also be integrated. Specifically, the end cap 120 and the receiving shell 110 can first form a common connection surface before other components are put into the shell. When it is necessary to encapsulate the inside of the receiving shell 110, then the end cap 120 covers the receiving shell 110. The receiving shell 110 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the receiving shell 110 can be determined according to the specific shape and size of the electrode assembly 200. The material of the receiving shell 110 can be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0188] Optionally, the battery cell 1 includes a housing 100, a bottom cover, and an electrode assembly 200. The housing 100 has an open end 112, and a terminal is provided on the wall of the housing 100 opposite to the open end 112. The terminal has a through hole, and the housing and the bottom cover are connected to form a receiving cavity communicating with the through hole. The active material coating portion of the electrode assembly 200 is disposed inside the housing 100, and the tab 201 of the electrode assembly 200 passes through the through hole and is connected to the side of the terminal facing away from the receiving cavity.

[0189] The electrode assembly 200 is a component in the battery cell 1 where an electrochemical reaction occurs. The receiving housing 110 may contain one or more electrode assemblies 200.

[0190] In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 1, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent short circuit between the positive and negative electrodes and allow active ions to pass through. As Figure 4 shown, the separator can be a separator membrane 222.

[0191] In some embodiments, as Figure 4 shown, the positive electrode can be a positive electrode plate 221, and the positive electrode plate 221 may include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector.

[0192] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is provided on any one or both of the two opposite surfaces of the positive electrode current collector.

[0193] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector may include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0194] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphate may include, but are not limited to, lithium iron phosphate (such as LiFePO 4(which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, or at least one of them. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn2O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (which can also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of their modified compounds, etc.

[0195] In some embodiments, as Figure 4 shown, the negative electrode can be the negative electrode tab 223, and the negative electrode tab 223 can include a negative electrode current collector.

[0196] As an example, the negative electrode current collector can be a metal foil, a foam metal, a composite current collector, or a foam carbon. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, carbon electrodes, carbon, nickel, or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0197] As an example, the negative electrode plate 223 can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0198] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on either or both of the two opposite surfaces of the negative electrode current collector.

[0199] As an example, the negative electrode active material can be the negative electrode active material for the battery cell 1 well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0200] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0201] In some embodiments, the electrode assembly 200 further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0202] In some embodiments, the separator is a separator 222. The present application does not particularly limit the type of the separator 222, and any well-known porous structure separator 222 with good chemical stability and mechanical stability can be selected.

[0203] As an example, the main material of the separator 222 can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator 222 can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator 222 is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0204] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0205] In some embodiments, the battery cell 1 further includes an electrolyte, and the electrolyte functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0206] Among them, the electrolyte solution can be a form of the electrolyte. The electrolyte solution can include an electrolyte salt and a solvent.

[0207] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(oxalate) borate, lithium difluoro bis(oxalate) phosphate, and lithium tetrafluorooxalate phosphate.

[0208] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0209] Among them, the gel-like electrolyte includes a polymer as the backbone network of the electrolyte, and is paired with an ionic liquid-lithium salt.

[0210] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0211] As an example, the polymer solid electrolyte can be polyether, polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc. As an example, the polymer solid electrolyte can be polyethylene oxide.

[0212] As an example, the inorganic solid electrolyte can be one or more of oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0213] As an example, the composite solid electrolyte is formed by adding inorganic solid electrolyte fillers to the polymer solid electrolyte.

[0214] In some embodiments, the electrode assembly 200 has a wound structure. The positive electrode tab 221 and the negative electrode tab 223 are wound into a wound structure.

[0215] In some embodiments, the electrode assembly 200 is provided with electrode tabs 201, and the electrode tabs 201 can conduct current out of the electrode assembly 200. The electrode tabs 201 include a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body together or at both ends of the electrode body respectively.

[0216] According to some embodiments of the present application, as Figures 5 to 7 shown, the electrode assembly 200 described in the embodiment of the coating device of the electrode assembly of the present application includes an electrode body 210, the electrode body 210 has a first direction D1, a second direction D2, and a third direction D3 that are orthogonal to each other, and includes two main surfaces 211 arranged opposite to each other along the first direction D1, two end surfaces 212 arranged opposite to each other along the second direction D2, and two side surfaces 213 arranged opposite to each other along the third direction D3. The coating device 300 includes a first positioning assembly 310 and a first coating assembly 330. The first positioning assembly 310 is configured to position the electrode assembly 200 and keep at least part of the two main surfaces 211 exposed respectively. The first coating assembly 330 is configured to position the coating film 400, wherein the coating film 400 includes two main coating regions 410 arranged at intervals from each other and a connection region 420 connecting the two main coating regions 410. At least one of the first positioning assembly 310 and the first coating assembly 330 is configured to be movable relative to the other, so that the connection region 420 contacts and coats the first one 212a of the two end surfaces 212, and the two main coating regions 410 respectively contact and coat the exposed parts of the corresponding one of the two main surfaces 211.

[0217] The first of the two end faces 212, i.e., 212a, can be connected between the two main faces 211 of the electrode body 210, so that the connection area 420 wraps around the first of the two end faces 212, i.e., 212a, while the two main wrapping areas 410 can wrap around the two main faces 211 respectively. In some embodiments, the two main wrapping areas 410 are respectively movable relative to the connection area 420, so that when the connection area 420 wraps around the first of the two end faces 212, i.e., 212a, the two main wrapping areas 410 can wrap around the two main faces 211 by moving relative to the connection area 420. The first wrapping assembly 330 can be arranged to drive the two main wrapping areas 410 to move relative to the connection area 420 respectively.

[0218] The first positioning assembly 310 and the first wrapping assembly 330 can drive the electrode assembly 200 and the wrapping film 400 to perform relative movement. When the first positioning assembly 310 positions the electrode assembly 200, the acting positions of the first positioning assembly 310 on the electrode assembly 200 can be the two main faces 211, the two side faces 213, or the second of the two end faces 212, i.e., 212b. When the acting positions of the first positioning assembly 310 on the electrode assembly 200 are the two main faces 211, the two main faces 211 are respectively partially kept exposed. When the acting positions of the first positioning assembly 310 on the electrode assembly 200 are the two side faces 213 or the second of the two end faces 212, i.e., 212b, the two main faces 211 can be respectively completely kept exposed.

[0219] By providing the first positioning assembly 310 and the first wrapping assembly 330, the relative position relationship between the two main faces 211 and the two wrapping areas can be adjusted, and the relative position relationship between the first of the two end faces 212, i.e., 212a, and the connection area 420 can be adjusted. When the wrapping film 400 wraps around the two main faces 211 and the first of the two end faces 212, i.e., 212a, of the electrode body 210, the stability of the wrapping process can be improved, making the wrapping action more concise and smooth.

[0220] According to some embodiments of the present application, optionally, as Figures 5 to 7 shown, the relative movement between the first positioning assembly 310 and the first wrapping assembly 330 is set such that the contact time between the connection area 420 and the first of the two end faces 212, i.e., 212a, is earlier than the contact time between the two main wrapping areas 410 and the corresponding one of the two main faces 211 respectively.

[0221] The operation of the connecting area 420 covering the first one 212a of the two end faces 212 is quite different from the operations of the two main covering areas 410 covering the two main faces 211 respectively, and it is not convenient to perform them simultaneously. If the contact time of the connecting area 420 with the first one 212a of the two end faces 212 is later than the contact times of the two main covering areas 410 with the corresponding ones of the two main faces 211 respectively, the movement of the connecting area 420 is restricted by the two main covering areas 410, and it is not convenient to perform the operation of the connecting area 420 covering the first one 212a of the two end faces 212. By setting the contact time of the connecting area 420 with the first one 212a of the two end faces 212 to be earlier than the contact times of the two main covering areas 410 with the corresponding ones of the two main faces 211 respectively, the operations of the two main covering areas 410 covering the two main faces 211 respectively can be performed after the operation of the connecting area 420 covering the first one 212a of the two end faces 212, reducing the operation difficulty of the covering process and being beneficial to simplifying the structure of the covering device 300.

[0222] According to some embodiments of the present application, optionally, as Figures 5 to 7 shown, the relative movement between the first positioning assembly 310 and the first covering assembly 330 is set such that the covering processes of the two main covering areas 410 for the corresponding ones of the two main faces 211 are at least partially synchronized.

[0223] The operations of the two main covering areas 410 covering the two main faces 211 respectively have small differences and can be performed at least partially synchronously. Such a setting is beneficial to simplifying the covering process and improving the covering efficiency. Further, the covering processes of the two main covering areas 410 for the corresponding ones of the two main faces 211 are performed synchronously.

[0224] According to some embodiments of the present application, optionally, as Figures 5 to 7 shown, before the first one 212a of the two end faces 212 contacts the connecting area 420, the first covering assembly 330 is set such that the connecting area 420 and the two main covering areas 410 are coplanar with each other.

[0225] By setting the connecting area 420 and the two main covering areas 410 to be coplanar with each other, it is convenient to stack and store the covering film 400, which can reduce the occupied space of the covering film 400 and facilitate the loading of the covering film 400. For example, the first covering assembly 330 stretches the covering film 400 by pulling it, so that the connecting area 420 and the two main covering areas 410 are coplanar with each other.

[0226] According to some embodiments of the present application, optionally, as Figures 5 to 7As shown, the first covering component 330 is arranged such that the connection area 420 is in a suspended state, and the relative movement between the first positioning component 310 and the first covering component 330 is arranged such that the first of the two end faces 212, i.e., 212a, contacts the connection area 420 in the suspended state.

[0227] By arranging the connection area 420 in a suspended state, the interference during the process of the connection area 420 covering the first of the two end faces 212, i.e., 212a, can be reduced, which is beneficial to improving the fitting degree between the connection area 420 and the first of the two end faces 212, i.e., 212a, and enhancing the covering effect of the connection area 420 on the first of the two end faces 212, i.e., 212a.

[0228] According to some embodiments of the present application, optionally, as Figures 5 to 7 shown, the electrode assembly 200 further includes a tab 201 protruding from the first of the two end faces 212, i.e., 212a. An opening 421 is provided on the connection area 420, and the tab 201 is arranged to pass through the opening 421 along with the relative movement between the first positioning component 310 and the first covering component 330.

[0229] The relative movement of the first positioning component 310 and the first covering component 330 can cause the relative movement of the electrode assembly 200 and the covering film 400. Due to the existence of the tab 201, the difficulty of the covering film 400 covering the first of the two end faces 212, i.e., 212a, is increased. By providing an opening 421 on the connection area 420, the opening 421 can form an avoidance for the tab 201, and the interference of the tab 201 on the covering process can be reduced, thereby improving the covering effect of the covering film 400 on the first of the two end faces 212, i.e., 212a.

[0230] When loading the electrode assembly 200 into the housing 100, the tab 201 and the opening of the housing 100 can be first arranged opposite and spaced apart in the second direction D2, and then the electrode assembly 200 is moved toward the housing 100 in the second direction D2, so that the tab 201 and the first of the two end faces 212, i.e., 212a, enter the housing 100 in sequence. The connection area 420 and the main covering area 410 can constrict the electrode assembly 200, so that an arc surface is formed at the connection between the main surface 211 of the electrode assembly 200 and the first of the two end faces 212, i.e., 212a, making it smoother for the first of the two end faces 212, i.e., 212a, to enter the housing 100, facilitating the loading of the electrode assembly 200 into the housing 100, and being beneficial to improving the assembly efficiency and assembly effect.

[0231] Further, no tab 201 is provided on the second one 212b among the two main surfaces 211, the two side surfaces 213, and the two end surfaces 212 of the electrode body 210. The coating device 300 controls the coating film 400 to coat the first one 212a of the two end surfaces 212 earlier than the coating device 300 controls the coating film 400 to coat the second one 212b of the two end surfaces 212 of the electrode body 210, as well as the two main surfaces 211 and the two side surfaces 213 of the electrode body 210. During the process of the coating film 400 coating the electrode body 210, it is necessary to perform a fixing operation on the edge of the coating film 400 so that the coating film 400 can be fixed on the electrode body 210. The coating device 300 controlling the coating film 400 to first coat the first one 212a of the two end surfaces 212 can make the edge of the coating film 400 fall outside the first one 212a of the two end surfaces 212, so that the tab 201 will not interfere with the fixing operation on the edge of the coating film 400, and improve the coating effect of the coating film 400 on the electrode body 210. In addition, the edge of the coating film 400 falls outside the first one 212a of the two end surfaces 212, which can reduce the risk that the edge of the coating film 400 is squeezed and detached from the electrode body 210 when the first one 212a of the two end surfaces 212 enters the housing 100, and can facilitate the installation of the electrode assembly 200 into the housing 100.

[0232] According to some embodiments of the present application, optionally, as Figures 5 to 7 shown, at least one of the first positioning assembly 310 and the first coating assembly 330 is arranged to move along the second direction D2, so that the electrode assembly 200 and the coating film 400 approach each other along the second direction D2. After the first one 212a of the two end surfaces 212 contacts the connection area 420, the electrode assembly 200 continues to move along the second direction D2 relative to the end of the two main coating areas 410 away from the connection area 420. The first coating assembly 330 is also arranged to move along the first direction D1, so that the ends of the two main coating areas 410 approach each other along the first direction D1, and further make the two main coating areas 410 contact and coat the exposed part of the corresponding one of the two main surfaces 211.

[0233] Specifically, the first positioning assembly 310 can drive the electrode assembly 200 to approach the coating film 400 along the second direction D2, or the first coating assembly 330 can drive the coating film 400 to approach the electrode assembly 200 along the second direction D2, or the first positioning assembly 310 drives the electrode assembly 200 to approach the coating film 400 along the second direction D2 while the first coating assembly 330 drives the coating film 400 to approach the electrode assembly 200 along the second direction D2, so that the electrode assembly 200 and the coating film 400 approach each other along the second direction D2 until the first one 212a of the two end surfaces 212 contacts the connection area 420 and is coated.

[0234] Along the second direction D2, the two main surfaces 211 can be connected between the two end surfaces 212. After the first one 212a of the two end surfaces 212 contacts the connection area 420, by driving the electrode assembly 200 to continue moving along the second direction D2 away from the end of the connection area 420 relative to the two main covering areas 410, the projections of the two main covering areas 410 on the corresponding main surfaces 211 along the first direction D1 can gradually cover the exposed parts of the main surfaces 211. At this time, the first covering assembly 330 can make the two main covering areas 410 contact and cover the exposed parts of the corresponding one of the two main surfaces 211 by driving the ends of the two main covering areas 410 to approach each other along the first direction D1 respectively.

[0235] With such a setting, the covering film 400 can be smoothly connected between covering the first one 212a of the two end surfaces 212 and covering the two main surfaces 211, simplifying the operation of the covering process and being beneficial to improving the covering efficiency.

[0236] According to some embodiments of the present application, optionally, as Figure 5 、 Figure 6 and Figure 8 shown, the first positioning assembly 310 includes an electrode clamp 311. The electrode clamp 311 is configured to clamp and fix the electrode body 210 from the outside of the two side surfaces 213 along the third direction D3, or is configured to clamp and fix the electrode body 210 from the outside of the two main surfaces 211 along the first direction D1.

[0237] When the electrode clamp 311 clamps and fixes the electrode body 210, the electrode clamp 311 and the electrode body 210 can remain relatively fixed. By setting the electrode clamp 311 to clamp and fix the electrode body 210, the first positioning assembly 310 can position the electrode assembly 200. By setting the electrode clamp 311 to clamp and fix the electrode body 210 from the outside of the two side surfaces 213 along the third direction D3, the electrode clamp 311 can avoid the two main surfaces 211 of the electrode body 210, which is beneficial to increasing the area of the exposed parts of the two main surfaces 211 and improving the covering effect on the two main surfaces 211. The area of the two main surfaces 211 is larger than the area of the two side surfaces 213. By setting the electrode clamp 311 to clamp and fix the electrode body 210 from the outside of the two main surfaces 211 along the first direction D1, it is beneficial to improve the stability of the electrode clamp 311 clamping and fixing the electrode body 210.

[0238] Furthermore, the electrode body 210 includes two electrode modules 220 described below. By setting the electrode clamp 311 to clamp and fix the electrode body 210 from the outside of the two main surfaces 211 along the first direction D1, it is beneficial for the two electrode modules 220 to remain relatively fixed and improve the stability of the electrode clamp 311 clamping and fixing the electrode body 210.

[0239] Optionally, asFigure 5 and Figure 8 As shown in Figure 8 , the electrode fixture 311 is in transmission connection with the electrode clamping cylinder 313, and the electrode clamping cylinder 313 can control the electrode fixture 311 to clamp or release the electrode body 210.

[0240] According to some embodiments of the present application, optionally, as Figures 5 to 7 shown in Figures 5 to 7 , the first positioning assembly 310 includes an electrode driving mechanism 312, and the electrode driving mechanism 312 is arranged to drive the electrode fixture 311 to move along the second direction D2 towards the side where the coating film 400 is located, so that after the first one 212a of the two end faces 212 contacts the connection area 420, the first one 212a of the two end faces 212 and the connection area 420 continue to move synchronously along the second direction D2.

[0241] The electrode driving assembly can provide power for the electrode assembly 200 to move along the second direction D2. With such a setting, the coating film 400 can be smoothly connected between coating the first one 212a of the two end faces 212 and coating the two main surfaces 211, simplifying the operation of the coating process and being beneficial to improving the coating efficiency.

[0242] Furthermore, the electrode driving mechanism 312 can be in transmission connection with the electrode fixture 311. The electrode driving mechanism 312 can drive the electrode assembly 200 to move along the second direction D2 by driving the electrode fixture 311 to move along the second direction D2.

[0243] Optionally, the electrode driving mechanism 312 includes an electrode driving motor 314, a lead screw and a slider. The electrode driving motor 314 can drive the lead screw to rotate. The slider is sleeved on the lead screw and is in screw engagement with the lead screw. The slider is fixedly arranged relative to the electrode assembly 200, and the rotation axis of the lead screw is arranged parallel to the second direction D2. When the electrode driving motor 314 drives the lead screw to rotate, it can drive the slider to move along the rotation axis direction of the lead screw, thereby driving the electrode assembly 200 to move along the second direction D2.

[0244] According to some embodiments of the present application, optionally, as Figure 5 and Figure 8 shown in Figure 8 , the electrode driving mechanism 312 includes an electrode driving motor 314, a first electrode bracket 3141 and a second electrode bracket 3142. The electrode driving motor 314 is arranged on the first electrode bracket 3141, and the electrode driving motor 314 is arranged to drive the second electrode bracket 3142 to move relative to the first electrode bracket 3141 along the second direction D2. The electrode fixture 311 is arranged on the second electrode bracket 3142 and includes an electrode jaw 3131 and an electrode clamping cylinder 313. The electrode clamping cylinder 313 is arranged to drive the electrode jaw 3131 to clamp and fix the electrode body 210.

[0245] With such a setting, it is beneficial to the stable movement of the electrode assembly 200 and can improve the accuracy of positioning the electrode assembly 200.

[0246] In some embodiments, the first covering assembly 330 includes a support frame, a support transmission mechanism, and two spaced-apart support plates. The support transmission mechanism and the two support plates are disposed on the support frame. One end of each support plate is rotatably connected to the support frame. The support transmission mechanism is used to drive the two support plates to rotate relative to the support frame so that the two support plates can be switched between a flat state and an opposing state. The two support plates respectively have support planes. In the flat state, the two support planes face the same direction and are coplanar, and the two support planes are respectively used to support a main covering area 410, so that the connection area 420 and the two main covering areas 410 can be coplanar with each other. The spaced-apart arrangement of the two support plates can make the connection area 420 in a suspended state. In the opposing state, the two support planes are spaced apart and opposite, so that the two main covering areas 410 correspondingly supported by the two support planes are bent relative to the connection area 420. Thus, when the two support plates are switched from the flat state to the opposing state, the two main covering areas 410 can cover the two main surfaces 211.

[0247] Optionally, the two support plates respectively have an adsorption structure, and the adsorption structure is used to keep the main covering area 410 relatively fixed to the support plate by adsorbing the main covering area 410.

[0248] According to some embodiments of the present application, optionally, as Figures 5 to 7 shown, the first covering assembly 330 includes two first sub-covering assemblies 331 spaced apart from each other. Each first sub-covering assembly 331 respectively includes a film clamp 332 and a first film transmission mechanism 333. The two film clamps 332 respectively clamp and fix the two ends of the covering film 400 away from the connection area 420. The first film transmission mechanism 333 drives the two film clamps 332 to approach each other along the first direction D1, so that the area of the main covering area 410 not clamped by the film clamp 332 can be bent relative to the connection area 420 toward the corresponding main surface 211.

[0249] In some embodiments, the two ends of the covering film 400 away from the connection area 420 can be located in the two main covering areas 410. At this time, the main covering area 410 is covered and clamped by the film clamp 332. In some other embodiments, the two ends of the covering film 400 away from the connection area 420 can be located outside the two main covering areas 410. At this time, the main covering area 410 is not clamped by the film clamp 332. For example, the covering film 400 includes the following end covering area 440, and the two ends of the covering film 400 away from the connection area 420 can be located in the end covering area 440.

[0250] When the first film driving mechanism 333 drives two film clamps 332 to approach each other along the first direction D1, the two film clamps 332 can drive the two ends of the covering film 400 away from the connection area 420 to approach each other, thereby driving the two main covering areas 410 to approach the corresponding main surfaces 211. When the main covering areas 410 approach the corresponding main surfaces 211, the areas of the main covering areas 410 that are not clamped by the film clamps 332 can be bent relative to the connection area 420.

[0251] In the first direction D1, the acting forces applied to the connection area 420 by the two film clamps 332 through the two main covering areas 410 can cancel each other out. Thus, after the connection area 420 contacts the electrode body 210, it can remain relatively fixed with respect to the electrode body 210. At the same time, in the second direction D2, the connection area 420 is supported by the electrode body 210, so that the connection area 420 can serve as a fulcrum for the area of the main covering area 410 that is not clamped by the film clamps 332 to be bent.

[0252] By setting the two film clamps 332 to respectively clamp and fix the two ends of the covering film 400 away from the connection area 420, it is convenient to control the movement of the main covering area 410, which is beneficial for the area of the main covering area 410 that is not clamped by the film clamps 332 to remain in an extended state, facilitating the action of the main covering area 410 covering the main surface 211, thereby improving the covering effect of the main covering area 410 on the main surface 211.

[0253] Optionally, as Figure 5 、 Figure 6 and Figure 9 shown, the film clamp 332 is in transmission connection with the film clamping cylinder 336, and the film clamping cylinder 336 can control the film clamp 332 to clamp or release the covering film 400.

[0254] Optionally, as Figure 5 、 Figure 6 and Figure 9 shown, the first film driving mechanism 333 includes a first film driving motor 337. The two first film driving motors 337 are used to respectively drive the two film clamps 332 to approach each other along the first direction D1. Specifically, the first film driving mechanism 333 further includes a lead screw and a slider. The first film driving motor 337 can drive the lead screw to rotate. The slider is sleeved on the lead screw and is in screw engagement with the lead screw. The slider is fixedly arranged relative to the film clamp 332, and the rotation axis of the lead screw is arranged parallel to the first direction D1. When the first film driving motor 337 drives the lead screw to rotate, it can drive the slider to move along the rotation axis direction of the lead screw, thereby driving the film clamp 332 to move along the first direction D1.

[0255] Optionally, as Figure 5 、 Figure 6 and Figure 9As shown, each film clamp 332 has two film grippers 338, each film gripper 338 is used to grip a corner of the covering film 400, and the four film grippers 338 grip the four corners of the covering film 400 respectively.

[0256] According to some embodiments of the present application, optionally, as Figure 5 , Figure 6 and Figure 9 shown, the first film transmission mechanism 333 includes a first film transmission motor 337, a first film support 3371 and a second film support 342. The first film transmission motor 337 is arranged on the first film support 3371, and the first film transmission motor 337 is arranged to drive the second film support 342 to move relative to the first film support 3371 along the first direction D1. The film clamp 332 is arranged on the second film support 342, and includes a film gripper 338 and a film clamping cylinder 336. The film clamping cylinder 336 is arranged to drive the film gripper 338 to grip and fix the covering film 400.

[0257] With such an arrangement, it is beneficial for the stable movement of the covering film 400 and can improve the positioning accuracy of the covering film 400.

[0258] According to some embodiments of the present application, optionally, as Figure 5 , Figure 6 and Figure 9 shown, each first sub-covering assembly 331 further includes a second film transmission mechanism 334 respectively. The two second film transmission mechanisms 334 drive the corresponding film clamps 332 to rotate respectively, so that the movement trend of the area of the covering film 400 gripped by the film clamps 332 relative to the connection area 420 is consistent with the bending trend of the un-gripped area of the main covering area 410 relative to the connection area 420.

[0259] After the un-gripped area of the main covering area 410 bends relative to the connection area 420, it can form a covering on the main surface 211. After the un-gripped area of the main covering area 410 covers the main surface 211, the film clamp 332 can release the grip on the covering film 400, and the area of the covering film 400 gripped by the film clamps 332 also needs to be covered on the electrode body 210. By setting the movement trend of the area of the covering film 400 gripped by the film clamps 332 relative to the connection area 420 to be consistent with the bending trend of the un-gripped area of the main covering area 410 relative to the connection area 420, the area of the covering film 400 gripped by the film clamps 332 can be closer to the electrode body 210, which is convenient for covering the area of the covering film 400 gripped by the film clamps 332 on the electrode body 210.

[0260] In addition, after the film clamp 332 releases the clamping of the coating film 400, by setting the movement trend of the area of the coating film 400 clamped by the film clamp 332 relative to the connection area 420 to be consistent with the bending trend of the unclamped area of the main coating area 410 relative to the connection area 420, the adverse effect of the area of the coating film 400 clamped by the film clamp 332 on the main surface 211 covered by the unclamped area of the main coating area 410 can be reduced, and the risk of the unclamped area of the main coating area 410 falling off from the main surface 211 can be lowered.

[0261] Optionally, as Figure 5 , Figure 6 and Figure 9 shown, the second film transmission mechanism 334 includes a fourth film support 339 and a second film transmission motor 340. A film clamp 332 is provided on the fourth film support 339, and the second film transmission motor 340 is used to drive the fourth film support 339 to rotate. Further, the film clamping cylinder 336 is fixed to the fourth film support 339.

[0262] According to some embodiments of the present application, optionally, as Figure 5 , Figure 6 and Figure 9 shown, the first film transmission mechanism 333 includes a first film transmission motor 337, a first film support 3371, and a second film support 342. The first film transmission motor 337 is provided on the first film support 3371, and the first film transmission motor 337 is configured to drive the second film support 342 to move relative to the first film support 3371 along the first direction D1. The second film transmission mechanism 334 includes a second film transmission motor 340. The second film transmission motor 340 is provided on the second film support 342 and drives the film clamp 332 to rotate. The film clamp 332 includes film clamping jaws 338 and a film clamping cylinder 336. The film clamping cylinder 336 is configured to drive the film clamping jaws 338 to clamp and fix the coating film 400.

[0263] With such a setting, the movement freedom of the coating film 400 can be improved, and the coating effect can be enhanced.

[0264] According to some embodiments of the present application, optionally, as Figure 5 , Figure 6 and Figure 9 shown, each first sub-coating assembly 331 further includes a third film transmission mechanism 335. The two third film transmission mechanisms 335 respectively drive the corresponding film clamps 332 to move along the second direction D2 toward the side where the electrode body 210 is located.

[0265] When the film fixture 332 moves along the second direction D2 towards the side where the electrode body 210 is located, the electrode assembly 200 can remain fixed or move towards the coating film 400 along the second direction D2. With such an arrangement, by driving the film fixture 332 to move along the second direction D2 towards the side where the electrode body 210 is located, the first one 212a of the two end faces 212 can be brought into contact with the connection area 420, and the main coating area 410 can be driven to move along the second direction D2 towards the side where the electrode body 210 is located, so that the projections of the two main coating areas 410 on the corresponding main surfaces 211 along the first direction D1 can gradually cover the exposed part of the main surface 211, thus facilitating the coating of the main surface 211 by the main coating area 410.

[0266] Optionally, as Figure 5 , Figure 6 and Figure 9 shown, the first positioning assembly 310 includes an electrode fixture 311 and an electrode driving mechanism 312. The electrode fixture 311 is configured to clamp and fix the electrode body 210, and the electrode driving mechanism 312 is configured to drive the electrode assembly 200 to move along the second direction D2 towards the side where the coating film 400 is located, so that after the first one 212a of the two end faces 212 contacts the connection area 420, the first one 212a of the two end faces 212 and the connection area 420 continue to move synchronously along the second direction D2, and the third film driving mechanism 335 drives the corresponding film fixture 332 to move along the second direction D2 towards the side away from the electrode body 210 after the first one 212a of the two end faces 212 contacts the connection area 420.

[0267] The direction in which the film fixture 332 moves along the second direction D2 can be the same as the direction in which the electrode assembly 200 moves along the second direction D2, so that the coating film 400 and the electrode assembly 200 can move synchronously to a new station. During the process of the coating film 400 and the electrode assembly 200 moving synchronously to a new station, the displacement stroke of the film fixture 332 moving along the second direction D2 towards the side away from the electrode body 210 is less than the displacement stroke of the electrode assembly 200 moving along the second direction D2 towards the side where the coating film 400 is located, so that a relative displacement is generated between the coating film 400 and the electrode assembly 200, so that the first one 212a of the two end faces 212 can be brought into contact with the connection area 420, and the main coating area 410 can be driven to move along the second direction D2 towards the side where the electrode body 210 is located, so that the projections of the two main coating areas 410 on the corresponding main surfaces 211 along the first direction D1 can gradually cover the exposed part of the main surface 211, thus facilitating the coating of the main surface 211 by the main coating area 410.

[0268] Optionally, as Figure 5 , Figure 6 and Figure 9As shown, the third film transmission mechanism 335 is provided with a third film transmission motor 341, and the third film transmission motor 341 is used to drive the film clamp 332 to move along the second direction D2. Specifically, the third film transmission mechanism 335 further includes a lead screw and a slider. The third film transmission motor 341 can drive the lead screw to rotate, and the slider is sleeved on the lead screw and is in screw engagement with the lead screw. The slider is fixedly arranged relative to the film clamp 332, and the rotation axis of the lead screw is arranged parallel to the second direction D2. When the third film transmission motor 341 drives the lead screw to rotate, it can drive the slider to move along the rotation axis direction of the lead screw, thereby driving the film clamp 332 to move along the second direction D2.

[0269] Optionally, as Figure 5 , Figure 6 and Figure 9 shown, the first sub-coating assembly 331 is provided with a second film support 342 and a third film support 343. The second film support 342 extends along the second direction D2, and the third film support 343 is slidably arranged on the second film support 342 along the second direction D2. The second film transmission mechanism 334 and the film clamp 332 are arranged on the third film support 343. The third film transmission mechanism 335 is in transmission connection with the third film support 343, and the third film transmission mechanism 335 can drive the third film support 343 to move along the second direction D2, thereby driving the second film transmission mechanism 334 and the film clamp 332 to move along the second direction D2 through the third film support 343. The third film transmission mechanism 335 is arranged on the second film support 342, and the first film transmission mechanism 333 is in transmission connection with the second film support 342. The first film transmission mechanism 333 can drive the second film support 342 to move along the first direction D1, thereby driving the third film transmission mechanism 335, the third film support 343, the second film transmission mechanism 334 and the film clamp 332 to move along the first direction D1 through the second film support 342.

[0270] According to some embodiments of the present application, optionally, as Figure 5 , Figure 6 and Figure 9As shown, the first film driving mechanism 333 includes a first film driving motor 337, a first film bracket 3371, and a second film bracket 342. The first film driving motor 337 is disposed on the first film bracket 3371 and is configured to drive the second film bracket 342 to move relative to the first film bracket 3371 along the first direction D1. The third film driving mechanism 335 includes a third film driving motor 341 and a third film bracket 343. The third film driving motor 341 is disposed on the second film bracket 342 and drives the third film bracket 343 to move relative to the second film bracket 342 along the second direction D2. The second film driving mechanism 334 includes a second film driving motor 340. The second film driving motor 340 is disposed on the third film bracket 343 and drives the film clamp 332 to rotate. The film clamp 332 includes film clamping jaws 338 and a film clamping cylinder 336. The film clamping cylinder 336 is configured to drive the film clamping jaws 338 to clamp and fix the coating film 400.

[0271] With such an arrangement, the degree of freedom of movement of the coating film 400 can be further improved, and the coating effect can be enhanced.

[0272] According to some embodiments of the present application, optionally, as Figure 5 , Figure 10 and Figure 11 shown, the coating device 300 further includes a second positioning assembly 350. The second positioning assembly 350 is configured to clamp and fix the coating film 400 and the electrode body 210 from the outside of the two main coating areas 410.

[0273] After the two main surfaces 211 of the electrode body 210 are coated in the two main coating areas 410, the second positioning assembly 350 can be used to clamp and fix the coating film 400 and the electrode body 210. By providing the second positioning assembly 350, the detachment of the main coating area 410 from the main surface 211 of the electrode body 210 can be restricted, and the stability of coating the main surface 211 of the electrode body 210 by the main coating area 410 can be improved.

[0274] According to some embodiments of the present application, optionally, as Figure 5 , Figure 10 and Figure 11 shown, the second positioning assembly 350 is a carrying jig capable of synchronously transferring with the coating film 400 and the electrode body 210.

[0275] By setting the second positioning assembly 350 as a carrying jig capable of synchronously transferring with the coating film 400 and the electrode body 210, it is convenient to transfer the coating film 400 and the electrode body 210 between different workstations, and the stability of the coating process of the main coating film 400 on the electrode body 210 can be improved.

[0276] Optionally, the first positioning assembly 310 is a manipulator with a clamping function.

[0277] According to some embodiments of the present application, optionally, as Figure 5 , Figure 10 and Figure 11 shown, the first positioning component 310 is arranged to insert the electrode body 210 and the coating film 400 into the second positioning component 350 along the second direction D2.

[0278] The first positioning component 310 can drive the electrode component 200 to move towards the side where the coating film 400 is located along the second direction D2. After the electrode body 210 and the coating film 400 are inserted into the second positioning component 350, the second positioning component 350 can position the electrode component 200. Before and after the coating film 400 wraps the main surface 211 of the electrode body 210, the first positioning component 310 and the second positioning component 350 can alternately position the electrode component 200, which can make the movement of the electrode component 200 between different workstations smoother. At the same time, it can simplify the operation and structure of the second positioning component 350 for positioning the electrode component 200, which is beneficial to improving the coating efficiency.

[0279] Optionally, as Figure 5 , Figure 10 and Figure 11 shown, the second positioning component 350 has two limiting members 353 that can move away from or close to each other. When the electrode body 210 and the coating film 400 are inserted into the second positioning component 350, the two limiting members 353 can move away from each other, so as to facilitate the insertion of the electrode body 210 and the coating film 400 into the second positioning component 350.

[0280] According to some embodiments of the present application, optionally, as Figure 5 , Figure 10 and Figure 11 shown, each second positioning component 350 includes a fixed bracket 351, an opening and closing mechanism (not labeled), and two limiting members 353. The two limiting members 353 are movably arranged on the fixed bracket 351 along the first direction D1, and a limiting gap 354 is formed between them for the electrode body 210 and the coating film 400 to be inserted. The opening and closing mechanism is arranged to drive the two limiting members 353 to approach or move away from each other.

[0281] With such a setting, it is convenient for the electrode body 210 and the coating film 400 to be inserted into the limiting gap 354, and at the same time, the clamping effect on the electrode body 210 and the coating film 400 is improved.

[0282] According to some embodiments of the present application, optionally, as Figure 5 , Figure 10 and Figure 11As shown, each opening and closing mechanism includes an elastic member 355 and an opening mechanism (not shown in the figure). The elastic member 355 is disposed between two limiting members 353 and is configured to drive the two limiting members 353 to approach each other through its own elasticity, and the opening mechanism is configured to drive the two limiting members 353 to move away from each other.

[0283] By providing the elastic member 355, the second positioning assembly 350 can adaptively adjust the clamping force on the electrode body 210 and the coating film 400.

[0284] Optionally, as Figure 5 , Figure 10 and Figure 11 shown, a hook plate 356 is provided on the limiting member 353, and the opening mechanism drives the two limiting members 353 to move away from each other by hooking the hook plate 356.

[0285] According to some embodiments of the present application, optionally, as Figure 5 , Figure 10 and Figure 11 shown, the opening and closing mechanism includes a rotating member 357. Two ends of the rotating member 357 are respectively connected to the two limiting members 353. A middle region of the rotating member 357 is configured to be rotatably connected to the fixed bracket 351. The rotating member 357 is further configured to drive the other limiting member 353 to move in the opposite direction when the first of the two limiting members 353 moves in the first direction D1.

[0286] Between the two limiting members 353, the rotating member 357 can play a role in transferring and reversing the motion. By providing the rotating member 357, the two limiting members 353 can achieve synchronous motion and opposite motion directions.

[0287] According to some embodiments of the present application, optionally, as Figures 12 to 15 shown, the coating film 400 includes a side coating region 430 connected to the main coating region 410. The coating device 300 further includes a second coating assembly 370, and the second coating assembly 370 is configured to drive the side coating region 430 to contact and coat on the side surface 213.

[0288] The second coating assembly 370 can adjust the relative positional relationship between the electrode assembly 200 and the side coating region 430. By providing the second coating assembly 370 to coat the side coating region 430 on the side surface 213, the coating effect of the coating film 400 on the electrode body 210 can be improved.

[0289] According to some embodiments of the present application, optionally, as Figures 12 to 15As shown, the second covering component 370 includes a side pressing plate 371, a first pressing plate transmission mechanism 372, and a second pressing plate transmission mechanism 373. The first pressing plate transmission mechanism 372 is configured to drive the side pressing plate 371 in the first direction D1, so that the side pressing plate 371 pushes the side covering area 430 to bend relative to the main covering area 410 toward the side surface 213. The second pressing plate transmission mechanism 373 is configured to drive the side pressing plate 371 in the third direction D3, so that the side pressing plate 371 presses the side covering area 430 against the side surface 213.

[0290] After the main covering area 410 covers the main surface 211 of the electrode body 210, the side covering area 430 and the main covering area 410 can be coplanar or approximately coplanar. The movement of the side pressing plate 371 in the first direction D1 can push the side covering area 430 to bend relative to the main covering area 410, and the side covering area 430 gradually approaches the side surface 213 of the electrode body 210 during the bending process relative to the main covering area 410. After the side pressing plate 371 pushes the side covering area 430 to bend relative to the main covering area 410 toward the side surface 213, in the third direction D3, the side pressing plate 371 and the side surface 213 of the electrode body 210 can be opposite and spaced apart, and the side covering area 430 is located between the side pressing plate 371 and the side surface 213 of the electrode body 210. At this time, the movement of the side pressing plate 371 close to the electrode body 210 in the third direction D3 can press the side covering area 430 against the side surface 213 of the electrode body 210, so that the side covering area 430 forms a covering on the side surface 213 of the electrode body 210.

[0291] With such a setting, the actions of bending the side covering area 430 by the second covering component 370 and covering the side covering area 430 on the side surface 213 can be smoothly connected, which is beneficial to simplifying the actions and structure of the second covering component 370 and improving the covering efficiency.

[0292] Optionally, as Figures 12 to 15 shown, each main covering area 410 can be connected to two side covering areas 430. The two side covering areas 430 connected to the first of the two main covering areas 410 can be denoted as B1 and B2, and the two side covering areas 430 connected to the second of the two main covering areas 410 can be denoted as B3 and B4. The second covering component 370 includes four side pressing plates 371 corresponding to the four side covering areas 430 one by one. The four side pressing plates 371 can be denoted as C1, C2, C3, and C4, and C1, C2, C3, and C4 are configured to bend B1, B2, B3, and B4 toward the side surface 213 and press them against the side surface 213 of the electrode body 210 one by one.

[0293] Before the four side pressing plates 371 move along the first direction D1 respectively, the four side covering areas 430 are located between the four side pressing plates 371. The moving directions of C1 and C2 along the first direction D1 are opposite to the moving directions of C3 and C4 along the first direction D1, so that C1 and C2 can approach each other, and further C1 and C2 can bend B1 and B2 towards the side surface 213 respectively, and at the same time C3 and C4 can bend B3 and B4 towards the side surface 213 respectively.

[0294] Before C1 and C2 move along the third direction D3 respectively, C1 and C2 are spaced apart from and opposite to the two side surfaces 213 respectively. B1 is located between C1 and one side surface 213, and B2 is located between C2 and the other side surface 213. The moving directions of C1 approaching the electrode body 210 along the third direction D3 and C2 approaching the electrode body 210 along the third direction D3 are opposite, so that C1 and C2 approach each other, so that C1 and C2 press B1 and B2 on the side surface 213 of the electrode body 210 respectively. Before C3 and C4 move along the third direction D3 respectively, C3 and C4 are spaced apart from and opposite to the two side surfaces 213 respectively. B3 is located between C3 and one side surface 213, and B4 is located between C4 and the other side surface 213. The moving directions of C3 approaching the electrode body 210 along the third direction D3 and C4 approaching the electrode body 210 along the third direction D3 are opposite, so that C3 and C4 approach each other, so that C3 and C4 press B3 and B4 on the side surface 213 of the electrode body 210 respectively.

[0295] Further, there are two side covering areas 430 connected to each main covering area 410. One of the two side covering areas 430 connected to the first of the two main covering areas 410 and one of the two side covering areas 430 connected to the second of the two main covering areas 410 jointly cover one side surface 213 of the electrode body 210, and the other of the two side covering areas 430 connected to the first of the two main covering areas 410 and the other of the two side covering areas 430 connected to the second of the two main covering areas 410 jointly cover the other side surface 213 of the electrode body 210. Further, the two side covering areas 430 covering the same side surface 213 of the electrode body 210 can overlap and partially overlap with each other.

[0296] According to some embodiments of the present application, optionally, as Figures 12 to 15 shown, the covering film 400 includes an end covering area 440 connected to the main covering area 410, and the second covering assembly 370 is arranged to drive the end covering area 440 to contact and cover the second end surface 212b of the two end surfaces 212.

[0297] The second covering component 370 can adjust the relative positional relationship between the electrode component 200 and the end covering area 440. By arranging the second covering component 370 to cover the end covering area 440 on the second one 212b of the two end faces 212, the covering effect of the covering film 400 on the electrode body 210 can be improved.

[0298] According to some embodiments of the present application, optionally, as Figures 12 to 15 shown, the second covering component 370 includes an end face pressing plate 374, a first pressing plate transmission mechanism 372, and a third pressing plate transmission mechanism 375. The first pressing plate transmission mechanism 372 is used to drive the end face pressing plate 374 in the first direction D1, so that the end face pressing plate 374 pushes the end covering area 440 to bend relative to the main covering area 410 towards the second one 212b of the two end faces 212. The third pressing plate transmission mechanism 375 is used to drive the end face pressing plate 374 in the second direction D2, so that the end face pressing plate 374 presses the end covering area 440 on the second one 212b of the two end faces 212.

[0299] After the main covering area 410 is covered on the main surface 211 of the electrode body 210, the end covering area 440 and the main covering area 410 can be coplanar or approximately coplanar. The movement of the end face pressing plate 374 in the first direction D1 can push the end covering area 440 to bend relative to the main covering area 410. During the bending process of the end covering area 440 relative to the main covering area 410, it gradually approaches the second one 212b of the two end faces 212. After the end face pressing plate 374 pushes the end covering area 440 to bend relative to the main covering area 410 towards the second one 212b of the two end faces 212, in the second direction D2, the end face pressing plate 374 and the second one 212b of the two end faces 212 can be opposite and spaced apart, and the end covering area 440 is located between the end face pressing plate 374 and the second one 212b of the two end faces 212. At this time, the movement of the end face pressing plate 374 close to the electrode body 210 in the second direction D2 can press the end covering area 440 on the second one 212b of the two end faces 212, so that the end covering area 440 forms a covering on the second one 212b of the two end faces 212.

[0300] Optionally, as Figures 12 to 15 shown, each main covering area 410 is connected with an end covering area 440, and the second covering component 370 includes two end face pressing plates 374. The two end face pressing plates 374 moving in the first direction D1 respectively can make the two end face pressing plates 374 approach each other, and further can make the two end covering areas 440 bend towards the second one 212b of the two end faces 212 respectively. The two end face pressing plates 374 moving in the second direction D2 respectively can make the two end covering areas 440 cover on the second one 212b of the two end faces 212 respectively.

[0301] In some embodiments, the two end covering regions 440 may overlap with each other and partially overlap. One of the two end surface pressing plates 374 may first bend one end covering region 440 toward the second one 212b of the two end surfaces 212 and press it onto the second one 212b of the two end surfaces 212, and the other of the two end surface pressing plates 374 may then bend the other end covering region 440 toward the second one 212b of the two end surfaces 212 and press it onto the second one 212b of the two end surfaces 212.

[0302] In some embodiments, the second pressing plate transmission mechanism 373 includes a first pressing plate cylinder 376, and the third pressing plate transmission mechanism 375 includes a second pressing plate cylinder 3761. The second pressing plate cylinder 3761 is used to provide power for driving the end surface pressing plate 374 in the second direction D2, and the first pressing plate cylinder 376 is used to provide power for driving the side pressing plate 371 in the third direction D3. In some other embodiments, the second pressing plate transmission mechanism 373 and the third pressing plate transmission mechanism 375 may be linked. For example, the second pressing plate transmission mechanism 373 and the third pressing plate transmission mechanism 375 share a cylinder to provide power for driving the end surface pressing plate 374 in the second direction D2 and driving the side pressing plate 371 in the third direction D3 simultaneously, so that while the side pressing plate 371 moves toward the side covering region 430 in the third direction D3, the end surface pressing plate 374 moves toward the end covering region 440 in the second direction D2. Thus, the covering time can be reduced and the covering efficiency can be improved.

[0303] Optionally, there is no relative displacement between the end surface pressing plate 374 and the side pressing plate 371 in the first direction D1. The first pressing plate transmission mechanism 372 can drive the end surface pressing plate 374 and the side pressing plate 371 in the first direction D1 simultaneously. Thus, the covering efficiency can be improved. Further, when the first pressing plate transmission mechanism 372 drives the end surface pressing plate 374 in the first direction D1, it can synchronously drive the third pressing plate transmission mechanism 375 in the first direction D1, and when the first pressing plate transmission mechanism 372 drives the side pressing plate 371 in the first direction D1, it can synchronously drive the second pressing plate transmission mechanism 373 in the first direction D1.

[0304] Optionally, as Figures 12 to 15 shown, the first pressing plate transmission mechanism 372 is provided with a pressing plate driving motor 377. The pressing plate driving motor 377 is used to provide power for driving the end surface pressing plate 374 and the side pressing plate 371 in the first direction D1. Further, the pressing plate driving motor 377 is used to drive the second pressing plate transmission mechanism 373, the third pressing plate transmission mechanism 375, the end surface pressing plate 374 and the side pressing plate 371 in the first direction D1.

[0305] Optionally, as Figures 12 to 15As shown, the second covering assembly 370 includes a first pressing plate bracket 378 and a second pressing plate bracket 379. The second pressing plate bracket 379 is slidably disposed on the first pressing plate bracket 378 along the first direction D1. The first pressing plate transmission mechanism 372 is disposed on the first pressing plate bracket 378 and is in transmission connection with the second pressing plate bracket 379 to drive the second pressing plate bracket 379 to move relative to the first pressing plate bracket 378 along the first direction D1. The side pressing plate 371, the second pressing plate transmission mechanism 373, the end face pressing plate 374, and the third pressing plate transmission mechanism 375 can be disposed on the second pressing plate bracket 379 and move synchronously with the second pressing plate bracket 379 along the first direction D1.

[0306] Further, the first pressing plate bracket 378 and the second pressing plate bracket 379 are relatively fixedly disposed.

[0307] Optionally, as Figures 12 to 15 shown, an end limiting block 3741 with an adjustable position is provided on the end face pressing plate 374. The end limiting block 3741 is used to abut against the main covering area 410 to limit the electrode assembly 200 in the first direction D1. By adjusting the position of the end limiting block 3741 on the end face pressing plate 374, electrode assemblies 200 of different sizes can be matched, thereby improving the compatibility of the end face pressing plate 374 with electrode assemblies 200 of different sizes. Further, an arc surface facing the main covering area 410 is provided on the end limiting block 3741, so as to improve the fitting degree with the main covering area 410.

[0308] Optionally, as Figures 12 to 15 shown, a side limiting block 3711 with an adjustable position is provided on the side pressing plate 371. The side limiting block 3711 is used to abut against the main covering area 410 to limit the electrode assembly 200 in the first direction D1. By adjusting the position of the side limiting block 3711 on the side pressing plate 371, electrode assemblies 200 of different sizes can be matched, thereby improving the compatibility of the side pressing plate 371 with electrode assemblies 200 of different sizes. Further, an arc surface facing the main covering area 410 is provided on the side limiting block 3711, so as to improve the fitting degree with the main covering area 410.

[0309] According to some embodiments of the present application, optionally, as Figures 12 to 15As shown, the first platen transmission mechanism 372 includes a platen drive motor 377, a first platen bracket 378, and a second platen bracket 379. The platen drive motor 377 is disposed on the first platen bracket 378 and drives the second platen bracket 379 to move relative to the first platen bracket 378. The second platen transmission mechanism 373 includes a first platen cylinder 376. The first platen cylinder 376 is disposed on the second platen bracket 379, and the first platen cylinder 376 drives the side platen 371 to move relative to the second platen bracket 379. The third platen transmission mechanism 375 includes a second platen cylinder 3761. The second platen cylinder 3761 is disposed on the second platen bracket 379, and the second platen cylinder 3761 drives the end platen 374 to move relative to the second platen bracket 379.

[0310] With such an arrangement, the degrees of freedom of movement of the side platen 371 and the end platen 374 can be increased, which is beneficial to improving the covering effect.

[0311] According to some embodiments of the present application, optionally, as Figure 6 , Figure 7 , Figure 16 and Figure 17 shown, the covering film 400 further includes a side covering area 430 and an end covering area 440 connected to the main covering area 410. The side covering area 430 is covered on the side surface 213, and the end covering area 440 is covered on the second one 212b of the two end surfaces 212. The covering device 300 further includes a first tape attaching assembly 380. The first tape attaching assembly 380 is used to attach a first tape 510 to the electrode assembly 200. The first tape 510 includes a first part and a second part connected to each other. The first tape attaching assembly 380 is arranged to attach the first part 511 of the first tape 510 to the side covering area 430 and the second part 512 of the first tape 510 to the end covering area 440 at the corner formed by the side surface 213 and the second one 212b of the two end surfaces 212.

[0312] The first tape attaching assembly 380 can drive the electrode assembly 200 and the first tape 510 to move relative to each other. The first tape 510 can connect the side covering area 430 and the end covering area 440 together, so that the side covering area 430 and the end covering area 440 can be fixed relative to the electrode body 210, thereby improving the covering firmness of the covering film 400 to the electrode body 210.

[0313] Specifically, after pressing the end covering area 440 and the side covering area 430 onto the battery body, the first tape attaching assembly 380 can drive the electrode assembly 200 to move, so that the side covering area 430 and the first part 511 of the first tape 510 are disposed opposite to each other. Then, the first tape attaching assembly 380 drives the electrode assembly 200 to continue moving, so that the first part 511 of the first tape 510 adheres to the side covering area 430. After that, the first tape attaching assembly 380 can drive the electrode assembly 200 to rotate towards the second part 512 of the first tape 510, so that the second part 512 of the first tape 510 gradually approaches and finally adheres to the end covering area 440.

[0314] Alternatively, the first tape attaching assembly 380 can drive the electrode assembly 200 to move, so that the end covering area 440 and the second part 512 of the first tape 510 are disposed opposite to each other. Then, the first tape attaching assembly 380 drives the electrode assembly 200 to continue moving, so that the second part 512 of the first tape 510 adheres to the end covering area 440. After that, the first tape attaching assembly 380 can drive the electrode assembly 200 to rotate towards the first part 511 of the first tape 510, so that the first part 511 of the first tape 510 gradually approaches and finally adheres to the side covering area 430.

[0315] Furthermore, the side covering areas 430 respectively connected to the two main covering areas 410 jointly cover the same side surface 213 of the electrode body 210, and the first tape 510 can function to connect the two side covering areas 430 covering the same side surface 213 of the electrode body 210. The end covering areas 440 respectively connected to the two main covering areas 410 jointly cover the second one 212b of the two end surfaces 212, and the first tape 510 can function to connect the two end covering areas 440 covering the second one 212b of the two end surfaces 212.

[0316] Optionally, as Figures 18 to 23 shown, the first tape attaching assembly 380 further includes a first cutting mechanism 383, a first glue taking mechanism 386 and a first glue pulling mechanism 382. The first glue pulling mechanism 382 is used to clamp and pull the leading end of the released part of the first tape roll 384. The first cutting mechanism 383 is used to cut the first tape 510 from the released part of the first tape roll 384. The first glue taking mechanism 386 is used to suck and attach the first tape 510 onto the covering film 400.

[0317] Optionally, as Figures 18 to 23 shown, the first tape attaching assembly 380 further includes a first tape feeding mechanism 387. The first tape feeding mechanism 387 is used to convey the released part of the first tape roll 384 for the first cutting mechanism 383 to cut. Further, the first tape feeding mechanism 387 includes a roller (not labeled), and the roller is used to convey the released part of the first tape roll 384.

[0318] According to some embodiments of the present application, optionally, as Figures 18 to 23 shown, the first tape attaching assembly 380 includes a first unwinding mechanism 381, a first tape pulling mechanism 382, and a first cutting mechanism 383. The first unwinding mechanism 381 is configured to place and release a first tape roll 384. The first tape pulling mechanism 382 is configured to grip and pull the leading end of the released portion of the first tape roll 384. The first cutting mechanism 383 is configured to cut out a first tape 510 from the released portion of the first tape roll 384.

[0319] With such an arrangement, it is beneficial to automatically provide the first tape 510.

[0320] According to some embodiments of the present application, optionally, as Figures 18 to 23 shown, the first tape pulling mechanism 382 includes a first tape clamping cylinder 3821, a first tape pulling motor 3822, and a first tape clamping member 3823. The first tape clamping cylinder 3821 is used to drive the first tape clamping member 3823 to grip the leading end of the released portion. The first tape pulling motor 3822 is used to drive the first tape clamping member 3823 to move to pull the released portion.

[0321] By driving the first tape clamping member 3823 to move to pull the released portion, the first tape pulling motor 3822 can extend the released portion of the first tape roll 384, and the released portion of the first tape roll 384 is stretched to facilitate cutting.

[0322] According to some embodiments of the present application, optionally, as Figures 18 to 23 shown, the first unwinding mechanism 381 and the first cutting mechanism 383 are two corresponding sets. The first tape attaching assembly 380 includes a switching mechanism 385. The switching mechanism 385 includes a reel support 3851 and a switching motor 3852. The two sets of the first unwinding mechanism 381 and the first cutting mechanism 383 are arranged on the reel support 3851. The switching motor 3852 drives the reel support 3851 to rotate about a predetermined rotation axis so that the two sets of the first unwinding mechanism 381 and the first cutting mechanism 383 can be switched between a standby position and a working position for the first tape pulling mechanism 382 and the first cutting mechanism 383 to operate. The rotation axis is perpendicular to the plane where the released portion is located.

[0323] One first unwinding mechanism 381 and one first cutting mechanism 383 can form a set. Two first unwinding mechanisms 381 and two first cutting mechanisms 383 can correspondingly form two sets. With such an arrangement, it is beneficial to quickly perform the reel changing operation of the first tape roll 384 and can improve the reel changing efficiency. Specifically, each time the reel is changed, the switching motor 3852 drives the reel support 3851 to rotate 180°.

[0324] According to some embodiments of the present application, optionally, as Figures 18 to 23As shown, the first tape attaching assembly 380 includes a first tape picking mechanism 386 for adsorbing and picking up the first tape 510. The first cutting mechanism 383 includes a first pressing block 3831, a first cutting knife 3832, and a first cutting cylinder 3833. The first pressing block 3831 and the first cutting knife 3832 are relatively fixedly arranged. The first cutting cylinder 3833 is configured to drive the first pressing block 3831 to press and hold the released portion on the first tape picking mechanism 386, and drive the first cutting knife 3832 to cut out the first tape 510 from the released portion.

[0325] Setting the first pressing block 3831 to be able to press and position the released portion of the first tape roll 384 can improve the stability of the cutting process.

[0326] According to some embodiments of the present application, optionally, as Figures 18 to 23 As shown, the first tape attaching assembly 380 includes a first tape picking mechanism 386 for adsorbing and picking up the first tape 510. The first tape picking mechanism 386 includes a first tape picking member 3861, a first tape picking motor 3862, a second tape picking motor 3863, a first tape picking bracket 3864, and a second tape picking bracket 3865. The first tape picking member 3861 is used for adsorbing the first tape 510. The first tape picking motor 3862 is arranged on the first tape picking bracket 3864 and drives the second tape picking bracket 3865 to move to the side of the main surface of the released portion of the first tape roll 384. The second tape picking motor 3863 is arranged on the second tape picking bracket 3865 and drives the first tape picking member 3861 to approach and move away from the plane where the released portion of the first tape roll 384 is located.

[0327] With such a setting, the degree of freedom of movement of the first tape picking member 3861 can be improved, facilitating the picking and transferring of the first tape 510.

[0328] According to some embodiments of the present application, optionally, as Figures 18 to 23 As shown, the first tape picking member 3861 includes a first sub-tape picking portion 3866 and a second sub-tape picking portion 3867. The first sub-tape picking portion 3866 is used for adsorbing the first part 511 of the first tape 510 and attaching it to the side covering area 430. The second sub-tape picking portion 3867 is used for adsorbing the second part 512 of the first tape 510 and attaching it to the end covering area 440.

[0329] With such a setting, the coherence of the tape picking action and the tape attaching action can be improved.

[0330] Optionally, at least one of the first sub-tape picking part 3866 and the second sub-tape picking part 3867 has an adsorption surface for contacting and adsorbing the first tape 510. The first sub-tape picking part 3866 and the second sub-tape picking part 3867 are arranged to be relatively movable in a direction perpendicular to the adsorption surface, so that the first tape 510 adsorbed on the first tape picking member 3861 can be bent. For example, one of the first sub-tape picking part 3866 and the second sub-tape picking part 3867 can be driven to move in a direction perpendicular to the adsorption surface.

[0331] According to some embodiments of the present application, optionally, as Figures 18 to 23 shown, the first sub-tape picking part 3866 is a telescopic member. The second tape picking motor 3863 drives the first tape picking member 3861 in the third direction D3. The first sub-tape picking part 3866 presses the first part 511 of the first tape 510 on the side covering area 430 and contracts, so that the second sub-tape picking part 3867 can continue to move in the third direction D3 and fit the end covering area 440, and then attach the second part 512 of the first tape 510 to the end covering area 440. Alternatively, the second sub-tape picking part 3867 is a telescopic member. The second tape picking motor 3863 drives the first tape picking member 3861 in the second direction D2. The second sub-tape picking part 3867 presses the second part 512 of the first tape 510 on the end covering area 440 and contracts, so that the first sub-tape picking part 3866 can continue to move in the second direction D2 and fit the side covering area 430, and then attach the first part 511 of the first tape 510 to the side covering area 430.

[0332] The telescopic member can be telescopic. For example, the telescopic member is an elastic part and is telescopic under pressure.

[0333] With such a setting, the structural flexibility of the first tape picking member 3861 can be improved, so that the first tape picking member 3861 can adaptively adjust its shape according to the shape of the electrode body 210, thereby realizing diversified tape sticking actions. Specifically, when the first sub-tape picking part 3866 and the second sub-tape picking part 3867 pick up the first tape 510, the first tape 510 is in a planar shape. One of the first sub-tape picking part 3866 and the second sub-tape picking part 3867 is compressed, causing a dislocation between the first sub-tape picking part 3866 and the second sub-tape picking part 3867, so that the first tape 510 is bent to be able to be attached to both the end covering area 440 and the side covering area 430 at the same time.

[0334] According to some embodiments of the present application, optionally, as Figures 18 to 23As shown, the first cutting mechanism 383 is configured to cut out two first tapes 510 from the release portion. The first tape attaching assembly 380 includes a first tape picking mechanism 386 for adsorbing and picking up the first tape 510. The first tape picking mechanism 386 includes a first tape picking member 3861, a first tape picking motor 3862, a second tape picking motor 3863, a first tape picking support 3864, a second tape picking support 3865, a third tape picking support 3868, and a tape separating cylinder 3869. The number of the first tape picking members 3861 is two, and each adsorbs a corresponding first tape 510. The first tape picking motor 3862 is disposed on the first tape picking support 3864 and drives the second tape picking support 3865 to move to the side of the main surface of the release portion of the first tape roll 384. The second tape picking motor 3863 is disposed on the second tape picking support 3865 and drives the third tape picking support 3868 and the two first tape picking members 3861 to approach and move away from the plane where the release portion of the first tape roll 384 is located. The tape separating cylinder 3869 is disposed on the third tape picking support 3868 and is configured to drive the two first tape picking members 3861 to move away from each other so that the two first tape picking members 3861 respectively correspond to two corners spaced apart from the electrode assembly 200 along the third direction D3.

[0335] For example, the first cutting mechanism 383 is correspondingly provided with two first cutting blades 3832 for the same release portion, and the first cutting cylinder 3833 drives the two first cutting blades 3832 to move synchronously so that the two first cutting blades 3832 can cut out two first tapes 510 from the same release portion each time.

[0336] With such a setting, the first tape picking mechanism 386 can adsorb and pick up two first tapes 510 corresponding to each electrode assembly 200, and then realize attaching two first tapes 510 at two corners spaced apart from the electrode assembly 200 along the third direction D3 at the same time, improving the tape attaching efficiency.

[0337] According to some embodiments of the present application, optionally, as Figure 6 、 Figure 7 、 Figure 16 and Figure 17 shown, the coating device 300 further includes a second tape attaching assembly 390 for attaching a second tape to the electrode assembly. The second tape 520 includes a first portion and a second portion connected to each other. The second tape attaching assembly 390 is configured to attach the first portion 521 of the second tape 520 to the main coating area 410 and attach the second portion 522 of the second tape 520 to the side coating area 430 at the corner formed by the side surface 213 and the main surface 211.

[0338] The second tape attaching assembly 390 can drive the electrode assembly 200 and the second tape 520 to move relative to each other. Before attaching the second tape 520, at least a part of the side covering area 430 is only connected to one of the two main covering areas 410 and is not connected to the other of the two main covering areas 410. The second tape 520 can connect the side covering area 430 and the other of the main covering areas 410 together, so that the side covering area 430 and the main covering area 410 can be fixed relative to the electrode body 210, thereby improving the firmness of the covering film 400 covering the electrode body 210.

[0339] For example, after pressing the side covering area 430 against the battery body, the second tape attaching assembly 390 can drive the electrode assembly 200 to move, so that the first part 521 of the second tape 520 gradually approaches and finally attaches to the main covering area 410. Then, the second tape attaching assembly 390 can drive the electrode assembly 200 to rotate towards the second part 522 of the second tape 520, so that the second part 522 of the second tape 520 gradually approaches and finally attaches to the side covering area 430.

[0340] Optionally, as Figures 24 to 30 shown, the second tape attaching assembly 390 further includes a second cutting mechanism 393, a second glue taking mechanism 395 and a second glue pulling mechanism 392. The second glue pulling mechanism 392 is used to pull out the second tape 520, the second cutting mechanism 393 is used to cut the second tape 520 from the released part of the second tape roll 396, and the second glue taking mechanism 395 is used to suck the second tape 520 and attach it to the covering film 400.

[0341] Optionally, as Figures 24 to 30 shown, the second tape attaching assembly 390 further includes a second tape feeding mechanism 397. The second tape feeding mechanism 397 is used to convey the released part of the second tape roll 396 for the second cutting mechanism 393 to cut. Further, the second tape feeding mechanism 397 includes a roller (not labeled), and the roller is used to convey the released part of the second tape roll 396.

[0342] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the number of the first parts 521 of the second tape 520 is two, and they are located at both ends of the second part 522 of the second tape 520. The second tape attaching assembly 390 is arranged to attach the two first parts of the second tape 520 to the corresponding one of the two main covering areas 410 respectively.

[0343] With such an arrangement, the contact area between the second tape 520 and the covering film 400 can be increased, and the fixing effect on the side covering area 430 can be improved.

[0344] Further, the side covering areas 430 respectively connected to the two main covering areas 410 jointly cover the same side surface 213 of the electrode body 210, and the second tape 520 can function to connect the two side covering areas 430 covering the same side surface 213 of the electrode body 210.

[0345] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the second tape attaching assembly 390 includes a second unwinding mechanism 391, a second tape pulling mechanism 392, and a second cutting mechanism 393. The second unwinding mechanism 391 is configured to place and release the second tape roll 396. The second tape pulling mechanism 392 is configured to clamp and pull the leading end of the released portion of the second tape roll 396. The second cutting mechanism 393 is configured to cut out the second tape 520 from the released portion of the second tape roll 396.

[0346] With such a setting, it is beneficial to automatically provide the second tape 520.

[0347] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the second tape pulling mechanism 392 includes a second tape clamping cylinder 3921, a second tape pulling motor 3922, and a second tape clamping member 3923. The second tape clamping cylinder 3921 is used to drive the second tape clamping member 3923 to clamp the leading end of the released portion of the second tape roll 396, and the second tape pulling motor 3922 is used to drive the second tape clamping member 3923 to move to pull the released portion of the second tape roll 396.

[0348] By driving the second tape clamping member 3923 to move to pull the released portion, the second tape pulling motor 3922 can extend the released portion of the second tape roll 396, and the released portion of the second tape roll 396 is stretched to facilitate cutting.

[0349] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the second unwinding mechanism 391 and the second cutting mechanism 393 are two corresponding sets and are arranged at intervals along the width direction D4 of the released portion. The second tape attaching assembly 390 includes a tape pulling support 394, a tape pulling position-changing cylinder 3941, and a tape pulling position-changing support 3942. The tape pulling position-changing cylinder 3941 is arranged on the tape pulling support 394, and the second tape pulling mechanism 392 is arranged on the tape pulling position-changing support 3942. The tape pulling position-changing cylinder 3941 is configured to drive the tape pulling position-changing support 3942 to move along the interval direction D5 between the two second unwinding mechanisms 391, so that the second tape pulling mechanism 392 can be switched between the two sets of second unwinding mechanisms and the second cutting mechanism.

[0350] A second unwind mechanism 391 and a second cutting mechanism 393 can form a group. Two second unwind mechanisms 391 and two second cutting mechanisms 393 can correspondingly form two groups. By providing two groups of second unwind mechanisms 391 and second cutting mechanisms 393, the interference of the reel change operation of the second tape roll 396 on the tape pulling process can be reduced, and the tape pulling efficiency can be improved. Further, the two groups of second unwind mechanisms 391 and second cutting mechanisms 393 are arranged in layers in the height direction of the second tape attaching assembly 390.

[0351] By arranging the tape pulling position-changing cylinder 3941 to drive the tape pulling position-changing bracket 3942 to move along the interval direction D5 between the two second unwind mechanisms 391, the position of the tape pulling mechanism can correspond to the position of a group of second unwind mechanism 391 and second cutting mechanism 393 that is working, facilitating the tape pulling operation.

[0352] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the second tape attaching assembly 390 includes a second tape picking mechanism 395 for adsorbing and picking up the second tape 520. The second cutting mechanism 393 includes a second pressing block 3931, a second cutting knife 3932, and a second cutting cylinder 3933. The second pressing block 3931 and the second cutting knife 3932 are relatively fixedly arranged. The second cutting cylinder 3933 is arranged to drive the second pressing block 3931 to press the released part of the second tape roll 396 onto the second tape picking mechanism 395 and drive the second cutting knife 3932 to cut out the second tape 520 from the released part of the second tape roll 396.

[0353] Providing the second pressing block 3931 can press and position the released part of the second tape roll 396, improving the stability of the cutting process.

[0354] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the second tape attaching assembly 390 includes a second tape picking mechanism 395 for adsorbing and picking up the second tape 520. The second tape picking mechanism 395 includes a second tape picking member 3951, a fourth tape picking motor 3952, and a fourth tape picking bracket 3953. The second tape picking member 3951 is used for adsorbing the second tape 520. The fourth tape picking motor 3952 is arranged on the fourth tape picking bracket 3953 and drives the second tape picking member 3951 to move to the side of the main surface of the released part and drive the second tape picking member 3951 to approach and move away from the plane where the released part of the second tape roll 396 is located. Further, the fourth tape picking motor 3952 drives the second tape picking member 3951 to move to be oppositely arranged along the thickness direction D6 of the released part of the second tape roll 396 with respect to the released part of the second tape roll 396.

[0355] With such a setting, the degree of freedom of movement of the second glue-taking member 3951 can be improved, facilitating the suction and transfer of the second tape 520.

[0356] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the second glue-taking member 3951 includes a third sub-glue-taking portion 3954 and a fourth sub-glue-taking portion 3955. The third sub-glue-taking portion 3954 is used to adsorb the first portion 521 of the second tape 520 and attach it to the main covering area 410. The fourth sub-glue-taking portion 3955 is used to adsorb the second portion 522 of the second tape 520 and attach it to the side covering area 430.

[0357] With such a setting, the coherence of the glue-taking action and the glue-attaching action can be improved.

[0358] Optionally, at least one of the third sub-glue-taking portion 3954 and the fourth sub-glue-taking portion 3955 has an adsorption surface for contacting and adsorbing the second tape 520, and the third sub-glue-taking portion 3954 and the fourth sub-glue-taking portion 3955 are arranged to be relatively movable in a direction perpendicular to the adsorption surface, so that the second tape 520 adsorbed on the second glue-taking member 3951 can be bent. For example, one of the third sub-glue-taking portion 3954 and the fourth sub-glue-taking portion 3955 can be driven to move in a direction perpendicular to the adsorption surface.

[0359] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the fourth sub-glue-taking portion 3955 is a telescopic member. The fourth glue-taking motor 3952 drives the second glue-taking member 3951 in the third direction D3. The fourth sub-glue-taking portion 3955 presses the second portion 522 of the second tape 520 against the side covering area 430 and contracts, so that the third sub-glue-taking portion 3954 can continue to move in the third direction D3 and fit the main covering area 410, and then attach the first portion 521 of the second tape 520 to the main covering area 410.

[0360] The telescopic member can expand and contract. For example, the telescopic member is an elastic part.

[0361] With such a setting, the structural flexibility of the second glue-taking member 3951 can be improved, enabling the second glue-taking member 3951 to adaptively adjust its shape according to the shape of the electrode body 210, thereby realizing diversified glue-pasting actions. Specifically, when the third sub-glue-taking portion 3954 and the fourth sub-glue-taking portion 3955 suck the second tape 520, the second tape 520 is in a planar shape. The fourth sub-glue-taking portion 3955 is compressed, causing the first sub-glue-taking portion 3866 and the second sub-glue-taking portion 3867 to be misaligned, so that the second tape 520 is bent to be able to be attached to the main wrapping area 410 and the side wrapping area 430 simultaneously. Further, the fourth sub-glue-taking portion 3955 is located between the two third sub-glue-taking portions 3954. During glue-pasting, both of the two third sub-glue-taking portions 3954 can be misaligned with the fourth sub-glue-taking portion 3955, enabling the second tape 520 to be attached to the two main wrapping areas 410 and the side wrapping area 430 simultaneously.

[0362] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the second unwinding mechanism 391 and the second cutting mechanism 393 are two corresponding sets, and are spaced apart along the width direction D4 of the released portion of the second tape roll 396. The second glue-taking mechanism 395 includes a glue-taking position-changing air cylinder 3956 and a glue-taking position-changing bracket 3957. The glue-taking position-changing air cylinder 3956 is arranged on the fourth glue-taking bracket 3953, and the second glue-taking member 3951 is arranged on the glue-taking position-changing bracket 3957. The glue-taking position-changing air cylinder 3956 is arranged to drive the glue-taking position-changing bracket 3957 to move along the spacing direction D5 between the two second unwinding mechanisms 391, so that the second glue-taking member 3951 can be switched between the two sets of second unwinding mechanisms 391 and the second cutting mechanism 393.

[0363] Each second unwinding mechanism 391 and the second cutting mechanism 393 can form a set. By providing two sets of second unwinding mechanisms 391 and the second cutting mechanism 393, the interference of the rewinding operation of the second tape roll 396 on the glue-taking process can be reduced, and the glue-taking efficiency can be improved. Further, the two sets of second unwinding mechanisms 391 and the second cutting mechanism 393 are arranged in layers in the height direction of the second tape attaching assembly 390.

[0364] By arranging the glue-taking position-changing air cylinder 3956 to drive the glue-taking position-changing bracket 3957 to move along the spacing direction D5 between the two second unwinding mechanisms 391, the position of the second glue-taking member 3951 can correspond to the position of the set of second unwinding mechanisms 391 and the second cutting mechanism 393 that is working, facilitating the glue-taking operation.

[0365] According to some embodiments of the present application, optionally, as Figures 24 to 30As shown, the second tape attaching assembly 390 includes a third positioning assembly 360, and the third positioning assembly 360 includes a main pressing cylinder 361, a main pressing member 362, a side pressing cylinder 363, and a side pressing member 364. The main pressing cylinder 361 is configured to drive the main pressing member 362 to press the main covering area 410 and the main surface 211, and the side pressing cylinder 363 is configured to drive the side pressing member 364 to press the side covering area 430 and the side surface 213.

[0366] The side pressing member 364 and the main pressing member 362 can play a role in clamping and positioning the electrode assembly 200 and the covering film 400. When the main pressing member 362 is configured to press the main covering area 410 and the main surface 211, it forms an avoidance of the pasting position of the second tape 520. When the side pressing member 364 is configured to press the side covering area 430 and the side surface 213, it forms an avoidance of the pasting position of the second tape 520. With such a setting, the stability of the gluing process can be improved.

[0367] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the third positioning assembly 360 includes a rotating motor 365 and a rotating bracket 366. The main pressing cylinder 361, the main pressing member 362, the side pressing cylinder 363, and the side pressing member 364 are disposed on the rotating bracket 366, and the rotating motor 365 is configured to drive the rotating bracket 366 to rotate. The axis of rotation of the rotating bracket 366 is parallel to the second direction D2.

[0368] With such a setting, the degree of freedom of movement of the electrode assembly 200 can be improved, which is convenient for pasting the second tape 520 at different positions of the electrode assembly 200. Further, the rotating motor 365 is configured to drive the rotating bracket 366 to rotate 180°, so as to be able to paste the second tape 520 on the opposite sides of the electrode assembly 200 respectively.

[0369] According to some embodiments of the present application, optionally, as Figures 24 to 30 shown, the second tape attaching assembly 390 includes two second unwinding mechanisms 391. The third positioning assembly 360 includes a shifting motor 367 and a shifting bracket 368. The main pressing cylinder 361, the main pressing member 362, the side pressing cylinder 363, the side pressing member 364, the rotating motor 365, and the rotating bracket 366 are disposed on the shifting bracket 368. The shifting motor 367 is configured to drive the shifting bracket 368 to move along the interval direction D5 of the two second unwinding mechanisms 391.

[0370] Each second unwinding mechanism 391 and the second cutting mechanism 393 can form a group. By providing two groups of second unwinding mechanisms 391 and second cutting mechanisms 393, the interference of the rewinding operation of the second tape roll 396 on the gluing process can be reduced, and the glue taking efficiency can be improved. Further, the two groups of second unwinding mechanisms 391 and second cutting mechanisms 393 are arranged in layers in the height direction of the second tape attaching assembly 390.

[0371] By arranging the shifting motor 367 to drive the shifting bracket 368 to move along the interval direction D5 between the two second unwinding mechanisms 391, the position of the electrode assembly 200 can correspond to the positions of a group of second unwinding mechanisms 391 and the second cutting mechanism 393 that are working, facilitating the gluing operation.

[0372] According to some embodiments of the present application, optionally, as Figure 4 and Figure 31 shown, the electrode body 210 includes two electrode modules 220 stacked on top of each other along the first direction D1, and each electrode module 220 respectively includes a positive electrode plate 221, a separator 222, and a negative electrode plate 223 arranged in sequence.

[0373] With such an arrangement, it is beneficial to improve the space utilization rate of the electrode assembly 200 and the energy storage density of the electrode assembly 200.

[0374] Furthermore, the two electrode modules 220 can be connected in series or in parallel through the pole ears 201.

[0375] Optionally, the two electrode modules 220 can be fixed together by a fixing member 230 to facilitate the stability of the coating process. For example, the fixing member 230 is a tape.

[0376] According to some embodiments of the present application, optionally, as Figures 4 to 31As shown, the electrode assembly 200 includes an electrode body 210 having a first direction D1, a second direction D2, and a third direction D3 that are orthogonal to each other, and includes two main surfaces 211 disposed opposite to each other along the first direction D1, two end surfaces 212 disposed opposite to each other along the second direction D2, and two side surfaces 213 disposed opposite to each other along the third direction D3. The coating device 300 includes a first positioning assembly 310 and a first coating assembly 330. The first positioning assembly 310 is configured to position the electrode assembly 200 and keep at least part of the two main surfaces 211 exposed respectively. The first coating assembly 330 is configured to position the coating film 400, where the coating film 400 includes two main coating regions 410 disposed at intervals from each other and a connection region 420 connecting the two main coating regions 410. At least one of the first positioning assembly 310 and the first coating assembly 330 is configured to drive the electrode assembly 200 and the coating film 400 to move relative to each other, so that the connection region 420 contacts and coats the first one 212a of the two end surfaces 212, and the two main coating regions 410 respectively contact and coat the exposed portions of the corresponding ones of the two main surfaces 211. The contact time of the connection region 420 with the first one 212a of the two end surfaces 212 is earlier than the contact time of the two main coating regions 410 with the corresponding ones of the two main surfaces 211 respectively. The coating processes of the two main coating regions 410 on the corresponding ones of the two main surfaces 211 are at least partially synchronous. Before the first one 212a of the two end surfaces 212 contacts the connection region 420, the first coating assembly 330 is configured to make the connection region 420 and the two main coating regions 410 coplanar with each other. The first coating assembly 330 is configured to make the connection region 420 in a suspended state, and the first one 212a of the two end surfaces 212 is configured to contact the connection region 420 in the suspended state. The electrode assembly 200 further includes a tab 201 protruding from the first one 212a of the two end surfaces 212, an opening 421 is provided on the connection region 420, and the tab 201 is configured to pass through the opening 421 as the electrode assembly 200 and the coating film 400 move relative to each other. At least one of the first positioning assembly 310 and the first coating assembly 330 is configured to drive the electrode assembly 200 and the coating film 400 to approach each other along the second direction D2, and after the first one 212a of the two end surfaces 212 contacts the connection region 420, drive the electrode assembly 200 to continue to move along the second direction D2 away from the end of the connection region 420 relative to the two main coating regions 410. The first coating assembly 330 is further configured to drive the ends of the two main coating regions 410 to approach each other along the first direction D1 respectively, so that the two main coating regions 410 contact and coat the exposed portions of the corresponding ones of the two main surfaces 211.The first positioning assembly 310 includes an electrode fixture 311 which is configured to clamp and fix the electrode body 210 from the outer sides of the two side surfaces 213 along the third direction D3, or is configured to clamp and fix the electrode body 210 from the outer sides of the two main surfaces 211 along the first direction D1. The first positioning assembly 310 includes an electrode driving mechanism 312 which is configured to drive the electrode assembly 200 to move along the second direction D2 towards the side where the coating film 400 is located, and after the first one 212a of the two end surfaces 212 contacts the connection area 420, drive the first one 212a of the two end surfaces 212 and the connection area 420 to continue to move synchronously along the second direction D2. The electrode driving mechanism 312 includes an electrode driving motor 314, a first electrode bracket 3141 and a second electrode bracket 3142. The electrode driving motor 314 is arranged on the first electrode bracket 3141 and is configured to drive the second electrode bracket 3142 to move relative to the first electrode bracket 3141 along the second direction D2. The electrode fixture 311 is arranged on the second electrode bracket 3142 and includes an electrode jaw 3131 and an electrode clamping cylinder 313. The electrode clamping cylinder 313 is configured to drive the electrode jaw 3131 to clamp and fix the electrode body 210. The first coating assembly 330 includes two first sub-coating assemblies 331 which are spaced apart from each other. Each first sub-coating assembly 331 respectively includes a film fixture 332 and a first film driving mechanism 333. The two film fixtures 332 respectively clamp and fix the two ends of the coating film 400 away from the connection area 420. The first film driving mechanism 333 drives the two film fixtures 332 to move closer to each other along the first direction D1, so that the area of the main coating area 410 not clamped by the film fixture 332 can be bent towards the corresponding main surface 211 relative to the connection area 420. The first film driving mechanism 333 includes a first film driving motor 337, a first film bracket 3371 and a second film bracket 342. The first film driving motor 337 is arranged on the first film bracket 3371 and is configured to drive the second film bracket 342 to move relative to the first film bracket 3371 along the first direction D1. The film fixture 332 is arranged on the second film bracket 342 and includes a film jaw 338 and a film clamping cylinder 336. The film clamping cylinder 336 is configured to drive the film jaw 338 to clamp and fix the coating film 400. Each first sub-coating assembly 331 also respectively includes a second film driving mechanism 334 which respectively drives the corresponding film fixture 332 to rotate, so that the movement trend of the area of the coating film 400 clamped by the film fixture 332 relative to the connection area 420 is consistent with the bending trend of the unclamped area of the main coating area 410 relative to the connection area 420.The first film transmission mechanism 333 includes a first film transmission motor 337, a first film support 3371, and a second film support 342. The first film transmission motor 337 is disposed on the first film support 3371 and is configured to drive the second film support 342 to move relative to the first film support 3371 along the first direction D1. The second film transmission mechanism 334 includes a second film transmission motor 340. The second film transmission motor 340 is disposed on the second film support 342 and drives the film clamp 332 to rotate. The film clamp 332 includes film clamping jaws 338 and a film clamping cylinder 336. The film clamping cylinder 336 is configured to drive the film clamping jaws 338 to clamp and fix the covering film 400. Each first sub-covering assembly 331 further includes a third film transmission mechanism 335. The two third film transmission mechanisms 335 respectively drive the corresponding film clamps 332 to move along the second direction D2 toward the side where the electrode body 210 is located. Alternatively, the first positioning assembly 310 includes an electrode transmission mechanism 312. The electrode transmission mechanism 312 is configured to drive the electrode assembly 200 to move along the second direction D2 toward the side where the covering film 400 is located. After the first of the two end faces 212, i.e., 212a, contacts the connection area 420, the electrode transmission mechanism 312 drives the first of the two end faces 212, i.e., 212a, and the connection area 420 to continue to move synchronously along the second direction D2. After the first of the two end faces 212, i.e., 212a, contacts the connection area 420, the third film transmission mechanism 335 drives the corresponding film clamp 332 to move along the second direction D2 away from the electrode body 210 along the second direction D2. The first film transmission mechanism 333 includes a first film transmission motor 337, a first film support 3371, and a second film support 342. The first film transmission motor 337 is disposed on the first film support 3371 and is configured to drive the second film support 342 to move relative to the first film support 3371 along the first direction D1. The third film transmission mechanism 335 includes a third film transmission motor 341 and a third film support 343. The third film transmission motor 341 is disposed on the second film support 342 and drives the third film support 343 to move relative to the second film support 342 along the second direction D2. The second film transmission mechanism 334 includes a second film transmission motor 340. The second film transmission motor 340 is disposed on the third film support 343 and drives the film clamp 332 to rotate. The film clamp 332 includes film clamping jaws 338 and a film clamping cylinder 336. The film clamping cylinder 336 is configured to drive the film clamping jaws 338 to clamp and fix the covering film 400. The covering device 300 further includes a second positioning assembly 350. The second positioning assembly 350 is configured to clamp and fix the covering film 400 and the electrode body 210 from the outside of the two main covering areas 410. The second positioning assembly 350 is a carrying jig that can rotate synchronously with the covering film 400 and the electrode body 210. The first positioning assembly 310 is configured to drive the electrode assembly 200 to move along the second direction D2 toward the side where the covering film 400 is located, so that the electrode body 210 and the covering film 400 are inserted into the second positioning assembly 350.Each second positioning component 350 includes a fixed bracket 351, an opening and closing mechanism, and two limiting members 353. The two limiting members 353 are movably arranged on the fixed bracket 351 along the first direction D1, and a limiting gap 354 is formed therebetween for the electrode body 210 and the coating film 400 to be inserted. The opening and closing mechanism is configured to drive the two limiting members 353 to approach or separate from each other. Each opening and closing mechanism includes an elastic member 355 and an opening mechanism. The elastic member 355 is arranged between the two limiting members 353 and is configured to drive the two limiting members 353 to approach each other through its own elasticity. The opening mechanism is configured to drive the two limiting members 353 to separate from each other. The opening and closing mechanism includes a rotating member 357, and both ends of the rotating member 357 are respectively connected to the two limiting members 353. The middle region of the rotating member 357 is configured to be rotatably connected to the fixed bracket 351. The rotating member 357 is further configured to drive the other limiting member 353 to move in the reverse direction when the first one of the two limiting members 353 moves along the first direction D1. The coating film 400 includes a side coating area 430 connected to the main coating area 410. The coating device 300 further includes a second coating component 370, and the second coating component 370 is configured to drive the side coating area 430 to contact and coat on the side surface 213. The second coating component 370 includes a side pressing plate 371, a first pressing plate driving mechanism 372, and a second pressing plate driving mechanism 373. The first pressing plate driving mechanism 372 is configured to drive the side pressing plate 371 along the first direction D1, so that the side pressing plate 371 pushes the side coating area 430 to bend relative to the main coating area 410 towards the side surface 213. The second pressing plate driving mechanism 373 is configured to drive the side pressing plate 371 along the third direction D3, so that the side pressing plate 371 presses the side coating area 430 on the side surface 213. The coating film 400 includes an end coating area 440 connected to the main coating area 410. The second coating component 370 is configured to drive the end coating area 440 to contact and coat on the second one 212b of the two end surfaces 212. The second coating component 370 includes an end pressing plate 374, a first pressing plate driving mechanism 372, and a third pressing plate driving mechanism 375. The first pressing plate driving mechanism 372 is configured to drive the end pressing plate 374 along the first direction D1, so that the end pressing plate 374 pushes the end coating area 440 to bend relative to the main coating area 410 towards the second one 212b of the two end surfaces 212. The third pressing plate driving mechanism 375 is configured to drive the end pressing plate 374 along the second direction D2, so that the end pressing plate 374 presses the end coating area 440 on the second one 212b of the two end surfaces 212. The first pressing plate driving mechanism 372 includes a pressing plate driving motor 377, a first pressing plate bracket 378, and a second pressing plate bracket 379. The pressing plate driving motor 377 is arranged on the first pressing plate bracket 378 and drives the second pressing plate bracket 379 to move relative to the first pressing plate bracket 378.The second platen drive mechanism 373 includes a first platen cylinder 376 which is disposed on the second platen bracket 379, and the first platen cylinder 376 drives the side platen 371 to move relative to the second platen bracket 379. The third platen drive mechanism 375 includes a second platen cylinder 3761 which is disposed on the second platen bracket 379, and the second platen cylinder 3761 drives the end platen 374 to move relative to the second platen bracket 379. The covering film 400 further includes a side covering area 430 and an end covering area 440 connected to the main covering area 410. The side covering area 430 covers the side surface 213, and the end covering area 440 covers the second one 212b of the two end surfaces 212. The covering device 300 further includes a first tape attaching assembly 380 which is used to drive the electrode assembly 200 and the first tape 510 to perform relative movement. The first tape 510 includes a first part and a second part connected to each other. The first tape attaching assembly 380 is arranged to attach the first part 511 of the first tape 510 to the side covering area 430 and attach the second part 512 of the first tape 510 to the end covering area 440 at the corner formed by the side surface 213 and the second one 212b of the two end surfaces 212. The first tape attaching assembly 380 includes a first unwinding mechanism 381, a first tape pulling mechanism 382 and a first cutting mechanism 383. The first unwinding mechanism 381 is arranged to place and release the first tape roll 384. The first tape pulling mechanism 382 is arranged to clamp and pull the leading end of the released part of the first tape roll 384. The first cutting mechanism 383 is arranged to cut out the first tape 510 from the released part of the first tape roll 384. The first tape pulling mechanism 382 includes a first tape clamping cylinder 3821, a first tape pulling motor 3822 and a first tape clamping member 3823. The first tape clamping cylinder 3821 is used to drive the first tape clamping member 3823 to clamp the leading end of the released part. The first tape pulling motor 3822 is used to drive the first tape clamping member 3823 to move to pull the released part. The first unwinding mechanism 381 and the first cutting mechanism 383 are two corresponding sets. The first tape attaching assembly 380 includes a switching mechanism 385 which includes a reel support 3851 and a switching motor 3852. The two sets of the first unwinding mechanism 381 and the first cutting mechanism 383 are disposed on the reel support 3851. The switching motor 3852 drives the reel support 3851 to rotate about a predetermined rotation axis so that the two sets of the first unwinding mechanism 381 and the first cutting mechanism 383 can be switched between a standby position and a working position for the first tape pulling mechanism 382 and the first cutting mechanism 383 to operate. The rotation axis is perpendicular to the plane where the released part is located. The first tape attaching assembly 380 includes a first tape picking mechanism 386 which is used to adsorb and pick up the first tape 510. The first cutting mechanism 383 includes a first pressing block 3831, a first cutter 3832 and a first cutting cylinder 3833.The first pressing block 3831 and the first cutting knife 3832 are relatively fixedly arranged. The first cutting cylinder 3833 is arranged to drive the first pressing block 3831 to press the release part on the first glue-taking mechanism 386, and drive the first cutting knife 3832 to cut out the first adhesive tape 510 from the release part. The first adhesive tape attaching assembly 380 includes a first glue-taking mechanism 386, and the first glue-taking mechanism 386 is used for adsorbing and taking away the first adhesive tape 510. The first glue-taking mechanism 386 includes a first glue-taking member 3861, a first glue-taking motor 3862, a second glue-taking motor 3863, a first glue-taking bracket 3864 and a second glue-taking bracket 3865. The first glue-taking member 3861 is used for adsorbing the first adhesive tape 510. The first glue-taking motor 3862 is arranged on the first glue-taking bracket 3864 and drives the second glue-taking bracket 3865 to move to the side of the main surface of the release part. The second glue-taking motor 3863 is arranged on the second glue-taking bracket 3865 and drives the first glue-taking member 3861 to approach and move away from the plane where the release part is located. The first glue-taking member 3861 includes a first sub-glue-taking part 3866 and a second sub-glue-taking part 3867. The first sub-glue-taking part 3866 is used for adsorbing the first part 511 of the first adhesive tape 510 and attaching it to the side covering area 430. The second sub-glue-taking part 3867 is used for adsorbing the second part 512 of the first adhesive tape 510 and attaching it to the end covering area 440. The first sub-glue-taking part 3866 is a telescopic member. The second glue-taking motor 3863 drives the first glue-taking member 3861 along the third direction D3. The first sub-glue-taking part 3866 presses the first part 511 of the first adhesive tape 510 on the side covering area 430 and contracts, so that the second sub-glue-taking part 3867 can continue to move along the third direction D3 and fit the end covering area 440, and then attach the second part 512 of the first adhesive tape 510 to the end covering area 440. Or, the second sub-glue-taking part 3867 is a telescopic member. The second glue-taking motor 3863 drives the first glue-taking member 3861 along the second direction D2. The second sub-glue-taking part 3867 presses the second part 512 of the first adhesive tape 510 on the end covering area 440 and contracts, so that the first sub-glue-taking part 3866 can continue to move along the second direction D2 and fit the side covering area 430, and then attach the first part 511 of the first adhesive tape 510 to the side covering area 430. The first cutting mechanism 383 is arranged to cut out two first adhesive tapes 510 from the release part. The number of the first glue-taking members 3861 is two, and they respectively adsorb the corresponding first adhesive tapes 510. The first adhesive tape attaching assembly 380 includes a first glue-taking mechanism 386. The first glue-taking mechanism 386 is used for adsorbing and taking away the first adhesive tape 510. The first glue-taking mechanism 386 includes a first glue-taking member 3861, a first glue-taking motor 3862, a second glue-taking motor 3863, a first glue-taking bracket 3864, a second glue-taking bracket 3865, a third glue-taking bracket 3868 and a glue-dividing cylinder 3869. The first glue-taking member 3861 is used for adsorbing the first adhesive tape 510.The first glue-taking motor 3862 is arranged on the first glue-taking bracket 3864 and drives the second glue-taking bracket 3865 to move to the side of the main surface of the release part. The second glue-taking motor 3863 is arranged on the second glue-taking bracket 3865 and drives the third glue-taking bracket 3868 and the two first glue-taking members 3861 to approach and move away from the plane where the release part is located. The glue-dividing air cylinder 3869 is arranged on the third glue-taking bracket 3868, and the glue-dividing air cylinder 3869 is arranged to drive the two first glue-taking members 3861 to move away from each other so that the two first glue-taking members 3861 respectively correspond to two corners spaced along the third direction D3 from the electrode assembly 200. The coating device 300 further includes a second tape attaching assembly 390. The second tape attaching assembly 390 is used to drive the electrode assembly 200 and the second tape 520 to perform relative movement. The second tape 520 includes a first part and a second part connected to each other. The second tape attaching assembly 390 is arranged to attach the first part 521 of the second tape 520 to the main coating area 410 and attach the second part 522 of the second tape 520 to the side coating area 430 at the corner formed by the side surface 213 and the main surface 211. The number of the first parts 521 of the second tape 520 is two and is located at both ends of the second part 522 of the second tape 520. The second tape attaching assembly 390 is arranged to attach the two first parts of the second tape 520 to the corresponding one of the two main coating areas 410 respectively. The second tape attaching assembly 390 includes a second tape unwinding mechanism 391, a second tape pulling mechanism 392 and a second cutting mechanism 393. The second tape unwinding mechanism 391 is arranged to place and release the second tape roll 396. The second tape pulling mechanism 392 is arranged to clamp and pull the leading end of the released part of the second tape roll 396. The second cutting mechanism 393 is arranged to cut out the second tape 520 from the released part of the second tape roll 396. The second tape pulling mechanism 392 includes a second tape clamping air cylinder 3921, a second tape pulling motor 3922 and a second tape clamping member 3923. The second tape clamping air cylinder 3921 is used to drive the second tape clamping member 3923 to clamp the leading end of the released part, and the second tape pulling motor 3922 is used to drive the second tape clamping member 3923 to move to pull the released part. The second tape unwinding mechanism 391 and the second cutting mechanism 393 are two corresponding groups and are arranged at intervals along the width direction D4 of the released part. The second tape attaching assembly 390 includes a tape pulling bracket 394, a tape pulling position-changing air cylinder 3941 and a tape pulling position-changing bracket 3942. The tape pulling position-changing air cylinder 3941 is arranged on the tape pulling bracket 394, and the second tape pulling mechanism 392 is arranged on the tape pulling position-changing bracket 3942. The tape pulling position-changing air cylinder 3941 is arranged to drive the tape pulling position-changing bracket 3942 to move along the interval direction D5 between the two second tape unwinding mechanisms 391 so that the second tape pulling mechanism 392 can be switched between a standby position and a working position for the second tape pulling mechanism 392 to operate. A set of the second tape unwinding mechanism 391 and the second cutting mechanism 393 are arranged at the standby position and the working position respectively.The second tape attaching assembly 390 includes a second glue taking mechanism 395 which is used to adsorb and take away the second tape 520. The second cutting mechanism 393 includes a second pressing block 3931, a second cutter 3932 and a second cutting cylinder 3933. The second pressing block 3931 and the second cutter 3932 are relatively fixedly arranged. The second cutting cylinder 3933 is configured to drive the second pressing block 3931 to press the release part onto the second glue taking mechanism 395, and drive the second cutter 3932 to cut out the second tape 520 from the release part. The second tape attaching assembly 390 includes a second glue taking mechanism 395 which is used to adsorb and take away the second tape 520. The second glue taking mechanism 395 includes a second glue taking member 3951, a fourth glue taking motor 3952 and a fourth glue taking bracket 3953. The second glue taking member 3951 is used to adsorb the second tape 520. The fourth glue taking motor 3952 is arranged on the fourth glue taking bracket 3953 and drives the second glue taking member 3951 to move to be oppositely arranged with the release part along the thickness direction D6 of the release part, and drives the second glue taking member 3951 to approach and move away from the plane where the release part is located. The second glue taking member 3951 includes a third sub-glue taking part 3954 and a fourth sub-glue taking part 3955. The third sub-glue taking part 3954 is used to adsorb the first part 521 of the second tape 520 and attach it to the main covering area 410. The fourth sub-glue taking part 3955 is used to adsorb the second part 522 of the second tape 520 and attach it to the side covering area 430. The fourth sub-glue taking part 3955 is a telescopic member. The fourth glue taking motor 3952 drives the second glue taking member 3951 along the third direction D3. The fourth sub-glue taking part 3955 presses the second part 522 of the second tape 520 onto the side covering area 430 and contracts, so that the third sub-glue taking part 3954 can continue to move along the third direction D3 and fit the main covering area 410, and then attach the first part 521 of the second tape 520 to the main covering area 410. The second unwinding mechanism 391 and the second cutting mechanism 393 are two corresponding groups and are arranged at intervals along the width direction D4 of the release part. The second glue taking mechanism 395 includes a glue taking position changing cylinder 3956 and a glue taking position changing bracket 3957. The glue taking position changing cylinder 3956 is arranged on the fourth glue taking bracket 3953, and the second glue taking member 3951 is arranged on the glue taking position changing bracket 3957. The glue taking position changing cylinder 3956 is configured to drive the glue taking position changing bracket 3957 to move along the interval direction D5 between the two second unwinding mechanisms 391, so that the second glue taking member 3951 can be switched between a standby position and a working position for the second glue taking mechanism 395 to operate. One set of the second unwinding mechanism 391 and the second cutting mechanism 393 are arranged at each of the standby position and the working position. The second tape attaching assembly 390 includes a third positioning assembly 360 which includes a main pressing cylinder 361, a main pressing member 362, a side pressing cylinder 363 and a side pressing member 364.The main pressing cylinder 361 is arranged to drive the main pressing member 362 to press the main covering area 410 and the main surface 211, and the side pressing cylinder 363 is arranged to drive the side pressing member 364 to press the side covering area 430 and the side surface 213. The third positioning assembly 360 includes a rotating motor 365 and a rotating bracket 366. The main pressing cylinder 361, the main pressing member 362, the side pressing cylinder 363 and the side pressing member 364 are arranged on the rotating bracket 366, and the rotating motor 365 is arranged to drive the rotating bracket 366 to rotate. The axis of rotation of the rotating bracket 366 is parallel to the second direction D2. The second tape attaching assembly 390 includes two second unwinding mechanisms 391. The third positioning assembly 360 includes a shifting motor 367 and a shifting bracket 368, and the main pressing cylinder 361, the main pressing member 362, the side pressing cylinder 363, the side pressing member 364, the rotating motor 365 and the rotating bracket 366 are arranged on the shifting bracket 368. The shifting motor 367 is arranged to drive the shifting bracket 368 to move along the interval direction D5 between the two second unwinding mechanisms 391. The electrode body 210 includes two electrode modules 220 stacked on each other along the first direction D1, and each electrode module 220 respectively includes a positive electrode plate 221, a separator 222 and a negative electrode plate 223 arranged in sequence.

[0377] Optionally, the covering device 300 further includes a covering film loading mechanism 301, an electrode assembly unloading mechanism 302, a fixture conveying line 303, a robot track 304 and a dust removal mechanism 305. The covering film loading mechanism 301 can suck the covering film 400 by negative pressure, and then transfer the covering film 400 to the first covering assembly 330. After the film fixture 332 positions the covering film 400, the covering film loading mechanism 301 can leave the covering film 400. The fixture conveying line 303 can be used to convey the second positioning assembly 350, so that the second positioning assembly 350 can reach different workstations, or so that the second positioning assembly 350 can carry the electrode assembly 200 to reach different workstations. The electrode assembly unloading mechanism 302 can move the electrode assembly 200 to other processes after the process of covering the electrode assembly 200 with the covering film 400.

[0378] The robot track 304 can provide support for some mechanisms that need to move, so that some mechanisms that need to move can move along the robot track 304. For example, the covering film loading mechanism 301 and the electrode assembly unloading mechanism 302 are slidably arranged on the robot track 304. The robot track 304 can be arranged to cross the fixture conveying line 303, so that the second positioning assembly 350 can switch between moving along the robot track 304 and moving along the fixture conveying line 303. For example, at least two robot tracks 304 can be arranged to intersect with at least two fixture conveying lines 303.

[0379] The jig conveyor line 303 may be arranged through the dust removal mechanism 305, so that the dust removal mechanism 305 can remove dust for the second positioning assembly 350 moved into the dust removal mechanism 305. For example, the dust removal mechanism 305 can remove dust for the unloaded second positioning assembly 350 by blowing and exhausting air. Furthermore, different jig conveyor lines 303 may be interconnected, so that the second positioning assembly 350 can be circulated through different jig conveyor lines 303.

[0380] Optionally, the first tape attaching assembly 380 or the second tape attaching assembly 390 may be disposed on one side of the jig conveyor line 303 , so that the first tape 510 or the second tape 520 can be attached to the electrode assembly 200 coated with the coating film 400 on the jig conveyor line 303 .

[0381] Optionally, the coating equipment 300 further includes a conveying device and an assembly device, wherein the conveying device is used to convey the structure to be assembled to each station of the assembly equipment. The stations of the assembly equipment at least include a tab welding device, a shell insertion device, a tab insertion device, a pole welding device and a bottom cover welding device.

[0382] Among them, the pole ear welding device is used to weld multiple pole ear sheets of the electrode assembly 200 to form the pole ear portion 201. The shell insertion device is used to load the electrode assembly 200 into the shell 100 from the open end 112. The pole ear piercing device is used to clamp the pole ear portion 201 through the through hole when the electrode assembly 200 is loaded into the shell. The pole column welding device is used to weld the pole ear portion 201 passing through the through hole to the side of the pole away from the accommodating cavity. The bottom cover welding device is used to weld the bottom cover to the open end 112 of the shell 100.

[0383] It should be noted that, in the present embodiment, the conveying equipment includes a conveyor line, which can be a conveying structure formed by a conveyor roller driven by a motor and a conveyor belt, or a conveying structure formed by a motor-driven conveyor chain link, or an AGV conveyor cart, which can realize conveying in at least one direction and can support and ensure the stability of the structure to be assembled.

[0384] The purpose of the pole ear welding device is to form the pole ear portion 201 after pre-welding the pole ear sheet, and it can be selected as an ultrasonic welding device, which can ensure that the pole ear is welded in a clamped stable state. The shell entry device is a pushing mechanism or a clamping mechanism, which can stably move the electrode assembly 200 toward the open end 112 of the shell 100 and enter the accommodating cavity through the open end 112. Similarly, the pole ear piercing device can adopt a clamping structure or a guiding structure, which can guide the pole ear portion 201 to pass through the through hole smoothly without interfering with the shell 100. The pole column welding device aims to realize the welding of the pole ear portion 201 and the pole, and it can be selected as a laser welding device. The bottom cover welding device aims to realize the circumferential edge welding of the bottom cover and the open end 112 of the shell 100, and is also a laser welding device.

[0385] In addition, the assembly device is not limited to including an ear welding device, a case inserting device, an ear threading device, a terminal welding device, and a bottom cover welding device. Exemplarily, when the electrode assembly 200 includes a plurality of electrode modules 220, for example, when including two electrode modules 220, the assembly device further includes a pairing assembly for stacking a plurality of electrode modules 220 such that the tab pieces of the two electrode modules 220 are substantially opposite to each other, so that the conveying structure can convey the paired electrode modules 220 to the ear welding device for welding the tab pieces to facilitate the formation of the tab portion 201. Again exemplarily, in order to ensure the reliability of the battery assembly process, a dust removal and NG detection station, etc. can also be added between any two adjacent stations, which is not limited in this embodiment.

[0386] According to some embodiments of the present application, optionally, the electrode assembly described in the embodiment of the electrode assembly coating method includes an electrode body having a first direction, a second direction, and a third direction that are orthogonal to each other, and including two main surfaces arranged opposite to each other along the first direction, two end surfaces arranged opposite to each other along the second direction, and two side surfaces arranged opposite to each other along the third direction. The coating method includes: S100: Position the electrode assembly using a first positioning assembly and keep at least part of the two main surfaces exposed respectively. S200: Position the coating film using a first coating assembly, where the coating film includes two main coating regions arranged at intervals from each other and a connection region connecting the two main coating regions. S300: Control at least one of the first positioning assembly and the first coating assembly to move relative to the other so that the connection region contacts and coats the first of the two end surfaces, and the two main coating regions respectively contact and coat the corresponding one of the two main surfaces from the exposed part of the first positioning assembly.

[0387] According to some embodiments of the present application, optionally, controlling at least one of the first positioning assembly and the first coating assembly to move relative to the other includes:

[0388] S310: Control the relative movement of the first positioning assembly and the first coating assembly so that the contact time of the connection region with the first of the two end surfaces is earlier than the contact time of the two main coating regions with the corresponding one of the two main surfaces respectively.

[0389] S320: Control the relative movement of the first positioning assembly and the first coating assembly so that the coating processes of the two main coating regions on the corresponding one of the two main surfaces are at least partially synchronous.

[0390] According to some embodiments of the present application, optionally, controlling at least one of the first positioning assembly and the first coating assembly to move relative to the other includes:

[0391] S330: Control at least one of the first positioning component and the first covering component to move along the second direction, so that the electrode component and the covering film approach each other along the second direction, and after the first one of the two end faces contacts the connection area, the electrode component continues to move along the second direction relative to the end of the two main covering areas away from the connection area.

[0392] S340: Control the first covering component to move along the first direction, so that the ends of the two main covering areas approach each other along the first direction, and then the two main covering areas contact and cover the exposed part of the corresponding one of the two main surfaces.

[0393] According to some embodiments of the present application, optionally, the electrode component includes a tab, the tab protrudes from the first one of the two end faces, and an opening is provided on the connection area.

[0394] Positioning the covering film by using the first covering component includes:

[0395] S210: Use the first positioning component to position the electrode component so that the tab faces the connection area.

[0396] Controlling at least one of the first positioning component and the first covering component to move relative to the other includes:

[0397] S350: Control the relative movement of the first positioning component and the first covering component so that the tab passes through the opening with the relative movement between the first positioning component and the first covering component, and the connection area contacts and covers the first one of the two end faces.

[0398] Regarding the embodiments of the covering method of the electrode component of the present application, reference may be made to the relevant content of the embodiments of the covering device of the electrode component above, and details will not be repeated here.

[0399] In summary, the embodiments of the present application can adjust the relative positional relationship between the electrode component and the covering film. When the covering film covers the two main surfaces and the first one of the two end faces of the electrode body, the stability of the covering process can be improved, and the covering action is more concise and smooth.

[0400] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coating device for an electrode assembly, characterized in that, the electrode assembly includes an electrode body having a first direction, a second direction and a third direction orthogonal to each other, and includes two main surfaces arranged opposite to each other along the first direction, two end surfaces arranged opposite to each other along the second direction, and two side surfaces arranged opposite to each other along the third direction. The coating device includes: A first positioning assembly configured to position the electrode assembly and keep at least part of the two main surfaces exposed respectively; A first coating assembly configured to position a coating film, wherein the coating film includes two main coating regions arranged at intervals from each other and a connection region connecting between the two main coating regions; At least one of the first positioning assembly and the first coating assembly is configured to be movable relative to the other, so that the connection region contacts and coats the first of the two end surfaces, and the two main coating regions respectively contact and coat the exposed portions of the corresponding one of the two main surfaces.

2. The coating device according to claim 1, characterized in that, the relative movement between the first positioning assembly and the first coating assembly is arranged such that the contact time of the connection region with the first of the two end surfaces is earlier than the contact time of the two main coating regions with the corresponding one of the two main surfaces respectively.

3. The coating device according to claim 2, characterized in that, the relative movement between the first positioning assembly and the first coating assembly is arranged such that the coating process of the two main coating regions on the corresponding one of the two main surfaces is at least partially synchronous.

4. The coating device according to claim 3, characterized in that, before the first of the two end surfaces contacts the connection region, the first coating assembly is arranged such that the connection region and the two main coating regions are coplanar with each other.

5. The coating device according to claim 4, characterized in that, the first coating assembly is arranged such that the connection region is in a suspended state, and the relative movement between the first positioning assembly and the first coating assembly is arranged such that the first of the two end surfaces contacts the connection region in the suspended state.

6. The coating device according to claim 1, characterized in that, the electrode assembly further includes a tab protruding from the first of the two end surfaces, an opening is provided on the connection region, and the tab is arranged to pass through the opening along with the relative movement between the first positioning assembly and the first coating assembly.

7. The coating device according to any one of claims 1-6, characterized in that, At least one of the first positioning component and the first covering component is arranged to move along the second direction, so that the electrode component and the covering film approach each other along the second direction. After the first one of the two end faces contacts the connection area, the end of the electrode component away from the connection area relative to the two main covering areas continues to move along the second direction. The first covering component is further arranged to move along the first direction, so that the ends of the two main covering areas approach each other along the first direction, and further so that the two main covering areas contact and cover the exposed part of the corresponding one of the two main faces.

8. The covering device according to any one of claims 1-6, characterized in that the first positioning component includes an electrode fixture, and the electrode fixture is arranged to clamp and fix the electrode body from the outside of the two side faces along the third direction, or is arranged to clamp and fix the electrode body from the outside of the two main faces along the first direction.

9. The covering device according to claim 8, characterized in that the first positioning component includes an electrode transmission mechanism, and the electrode transmission mechanism is arranged to drive the electrode fixture to move along the second direction towards the side where the covering film is located, so that after the first one of the two end faces contacts the connection area, the first one of the two end faces and the connection area continue to move synchronously along the second direction.

10. The covering device according to claim 9, characterized in that the electrode transmission mechanism includes an electrode transmission motor, a first electrode bracket and a second electrode bracket. The electrode transmission motor is arranged on the first electrode bracket, and the electrode transmission motor is arranged to drive the second electrode bracket to move relative to the first electrode bracket along the second direction; the electrode fixture is arranged on the second electrode bracket and includes an electrode jaw and an electrode clamping cylinder, and the electrode clamping cylinder is arranged to drive the electrode jaw to clamp and fix the electrode body.

11. The covering device according to any one of claims 1-6, characterized in that the first covering component includes two first sub-covering components arranged at intervals from each other. Each first sub-covering component respectively includes a film fixture and a first film transmission mechanism. The two film fixtures respectively clamp and fix the two ends of the covering film away from the connection area, and the first film transmission mechanism drives the two film fixtures to approach each other along the first direction, so that the area of the main covering area not clamped by the film fixture can be bent towards the corresponding main face relative to the connection area.

12. The covering device according to claim 11, characterized in that the first film transmission mechanism includes a first film transmission motor, a first film bracket and a second film bracket. The first film transmission motor is arranged on the first film bracket, and the first film transmission motor is arranged to drive the second film bracket to move relative to the first film bracket along the first direction; The membrane clamp is disposed on the second membrane support and includes a membrane clamping jaw and a membrane clamping cylinder, and the membrane clamping cylinder is configured to drive the membrane clamping jaw to clamp and fix the coating film.

13. The coating device according to claim 11, wherein, each of the first sub-coating assemblies further includes a second membrane transmission mechanism, and the two second membrane transmission mechanisms respectively drive the corresponding membrane clamps to rotate, so that the movement trend of the area of the coating film clamped by the membrane clamp relative to the connection area is consistent with the bending trend of the unclamped area of the main coating area relative to the connection area.

14. The coating device according to claim 13, wherein, the first membrane transmission mechanism includes a first membrane transmission motor, a first membrane support and a second membrane support, the first membrane transmission motor is disposed on the first membrane support, and the first membrane transmission motor is configured to drive the second membrane support to move relative to the first membrane support along the first direction; the second membrane transmission mechanism includes a second membrane transmission motor, the second membrane transmission motor is disposed on the second membrane support and drives the membrane clamp to rotate, the membrane clamp includes a membrane clamping jaw and a membrane clamping cylinder, and the membrane clamping cylinder is configured to drive the membrane clamping jaw to clamp and fix the coating film.

15. The coating device according to claim 13, wherein, each of the first sub-coating assemblies further includes a third membrane transmission mechanism, and the two third membrane transmission mechanisms respectively drive the corresponding membrane clamps to move toward the side where the electrode body is located along the second direction; alternatively, the first positioning assembly includes an electrode clamp and an electrode transmission mechanism, the electrode clamp is configured to clamp and fix the electrode body, and the electrode transmission mechanism is configured to drive the electrode clamp to move toward the side where the coating film is located along the second direction, so that after the first of the two end faces contacts the connection area, the first of the two end faces and the connection area continue to move synchronously along the second direction, and the third membrane transmission mechanism drives the corresponding membrane clamp to move away from the side where the electrode body is located along the second direction after the first of the two end faces contacts the connection area.

16. The coating device according to claim 15, wherein, the first membrane transmission mechanism includes a first membrane transmission motor, a first membrane support and a second membrane support, the first membrane transmission motor is disposed on the first membrane support, and the first membrane transmission motor is configured to drive the second membrane support to move relative to the first membrane support along the first direction; the third membrane transmission mechanism includes a third membrane transmission motor and a third membrane support, the third membrane transmission motor is disposed on the second membrane support and drives the third membrane support to move relative to the second membrane support along the second direction; The second film transmission mechanism includes a second film transmission motor, which is arranged on the third film support and drives the film clamp to rotate. The film clamp includes film clamping jaws and a film clamping cylinder, and the film clamping cylinder is configured to drive the film clamping jaws to clamp and fix the coating film.

17. The coating device according to any one of claims 1-6, wherein, the coating device further includes a second positioning assembly, which is configured to clamp and fix the coating film and the electrode body from the outside of the two main coating areas.

18. The coating device according to claim 17, wherein, the second positioning assembly is a carrying jig capable of synchronously transferring with the coating film and the electrode body.

19. The coating device according to claim 17, wherein, the first positioning assembly is configured to insert the electrode body and the coating film into the second positioning assembly along the second direction.

20. The coating device according to claim 19, wherein, each second positioning assembly includes a fixed bracket, an opening and closing mechanism and two limiting members. The two limiting members are movably arranged on the fixed bracket along the first direction and form a limiting gap therebetween. The limiting gap is for the electrode body and the coating film to be inserted; the opening and closing mechanism is configured to drive the two limiting members to approach or separate from each other.

21. The coating device according to claim 20, wherein, each opening and closing mechanism includes an elastic member and an opening mechanism; the elastic member is arranged between the two limiting members and is configured to drive the two limiting members to approach each other through its own elasticity, and the opening mechanism is configured to drive the two limiting members to separate from each other.

22. The coating device according to claim 20, wherein, the opening and closing mechanism includes a rotating member, and both ends of the rotating member are respectively connected to the two limiting members; a middle area of the rotating member is configured to be rotatably connected to the fixed bracket, and the rotating member is further configured to drive the other limiting member to move in the reverse direction when the first of the two limiting members moves along the first direction.

23. The coating device according to any one of claims 1-6, wherein, the coating film includes a side coating area connected to the main coating area, and the coating device further includes a second coating assembly, which is configured to drive the side coating area to contact and coat on the side surface.

24. The coating device according to claim 23, wherein, the second coating assembly includes a side pressing plate, a first pressing plate transmission mechanism and a second pressing plate transmission mechanism. The first pressing plate transmission mechanism is used to drive the side pressing plate along the first direction, so that the side pressing plate pushes the side coating area to bend towards the side surface relative to the main coating area, and the second pressing plate transmission mechanism is used to drive the side pressing plate along the third direction, so that the side pressing plate presses the side coating area on the side surface.

25. The coating device according to claim 24, wherein, The covering film includes an end covering area connected to the main covering area, and the second covering assembly is arranged to drive the end covering area to contact and cover the second of the two end faces.

26. The covering device according to claim 25, wherein, the second covering assembly includes an end face pressing plate, a first pressing plate driving mechanism and a third pressing plate driving mechanism. The first pressing plate driving mechanism is used to drive the end face pressing plate along the first direction, so that the end face pressing plate pushes the end covering area to bend relative to the main covering area towards the second of the two end faces. The third pressing plate driving mechanism is used to drive the end face pressing plate along the second direction, so that the end face pressing plate presses the end covering area against the second of the two end faces.

27. The covering device according to claim 26, wherein, the first pressing plate driving mechanism includes a pressing plate driving motor, a first pressing plate support, and a second pressing plate support. The pressing plate driving motor is arranged on the first pressing plate support and drives the second pressing plate support to move relative to the first pressing plate support; the second pressing plate driving mechanism includes a first pressing plate cylinder. The first pressing plate cylinder is arranged on the second pressing plate support, and the first pressing plate cylinder drives the side pressing plate to move relative to the second pressing plate support; the third pressing plate driving mechanism includes a second pressing plate cylinder. The second pressing plate cylinder is arranged on the second pressing plate support, and the second pressing plate cylinder drives the end face pressing plate to move relative to the second pressing plate support.

28. The covering device according to any one of claims 1-6, wherein, the covering film further includes a side covering area and an end covering area connected to the main covering area. The side covering area covers the side surface, and the end covering area covers the second of the two end faces. The covering device further includes a first tape attaching assembly, which is used to attach a first tape to the electrode assembly. The first tape includes a first part and a second part connected to each other. The first tape attaching assembly is arranged to attach the first part of the first tape to the side covering area and the second part of the first tape to the end covering area at the corner formed by the side surface and the second of the two end faces.

29. The covering device according to claim 28, wherein, the first tape attaching assembly includes a first unwinding mechanism, a first tape pulling mechanism and a first cutting mechanism. The first unwinding mechanism is arranged to place and release a first tape roll. The first tape pulling mechanism is arranged to clamp and pull the leading end of the released part of the first tape roll. The first cutting mechanism is arranged to cut out the first tape from the released part of the first tape roll.

30. The covering device according to claim 29, wherein, The first glue pulling mechanism includes a first glue clamping cylinder, a first glue pulling motor, and a first glue clamping member. The first glue clamping cylinder is used to drive the first glue clamping member to clamp the head end of the release portion, and the first glue pulling motor is used to drive the first glue clamping member to move so as to pull the release portion.

31. The covering device according to claim 29, wherein, the first unwinding mechanism and the first cutting mechanism are two corresponding groups; the first tape attaching assembly includes a switching mechanism, and the switching mechanism includes a reel support and a switching motor; the two groups of the first unwinding mechanisms and the first cutting mechanisms are arranged on the reel support; the switching motor drives the reel support to rotate around a predetermined rotation axis, so that the two groups of the first unwinding mechanisms and the first cutting mechanisms can be switched between a standby position and a working position for the first glue pulling mechanism and the first cutting mechanism to operate; the rotation axis is perpendicular to the plane where the release portion is located.

32. The covering device according to claim 29, wherein, the first tape attaching assembly includes a first glue taking mechanism, and the first glue taking mechanism is used to adsorb and take away the first tape; the first cutting mechanism includes a first pressing block, a first cutting knife, and a first cutting cylinder; the first pressing block and the first cutting knife are relatively fixedly arranged; the first cutting cylinder is arranged to drive the first pressing block to press the release portion onto the first glue taking mechanism, and drive the first cutting knife to cut out the first tape from the release portion.

33. The covering device according to claim 29, wherein, the first tape attaching assembly includes a first glue taking mechanism, and the first glue taking mechanism is used to adsorb and take away the first tape; the first glue taking mechanism includes a first glue taking member, a first glue taking motor, a second glue taking motor, a first glue taking support, and a second glue taking support; the first glue taking member is used to adsorb the first tape; the first glue taking motor is arranged on the first glue taking support and drives the second glue taking support to move to the side of the main surface of the release portion; the second glue taking motor is arranged on the second glue taking support and drives the first glue taking member to approach and move away from the plane where the release portion is located.

34. The covering device according to claim 33, wherein, the first glue taking member includes a first sub-glue taking portion and a second sub-glue taking portion; the first sub-glue taking portion is used to adsorb the first part of the first tape and attach it to the side covering area; the second sub-glue taking portion is used to adsorb the second part of the first tape and attach it to the end covering area.

35. The covering device according to claim 34, wherein, the first sub-glue taking portion is a telescopic member; the second glue taking motor drives the first glue taking member in the third direction, and the first sub-glue taking portion presses the first part of the first tape onto the side covering area and contracts, so that the second sub-glue taking portion can continue to move in the third direction and fit the end covering area, and then attach the second part of the first tape to the end covering area; or, The second sub glue-taking part is a telescopic part; the second glue-taking motor drives the first glue-taking part in the second direction, and the second sub glue-taking part presses and holds the second part of the first tape on the end covering area and contracts, so that the first sub glue-taking part can continue to move in the second direction and fit the side covering area, and then attach the first part of the first tape to the side covering area.

36. The covering device according to claim 29, wherein, the first cutting mechanism is configured to cut out two of the first tapes from the release portion; the first tape attaching assembly includes a first glue-taking mechanism for adsorbing and taking away the first tape, and the first glue-taking mechanism includes a first glue-taking part, a first glue-taking motor, a second glue-taking motor, a first glue-taking support, a second glue-taking support, a third glue-taking support and a glue separating cylinder; the number of the first glue-taking parts is two and respectively adsorb the corresponding first tapes; the first glue-taking motor is arranged on the first glue-taking support and drives the second glue-taking support to move to the side of the main surface of the release portion; the second glue-taking motor is arranged on the second glue-taking support and drives the third glue-taking support and the two first glue-taking parts to approach and move away from the plane where the release portion is located; the glue separating cylinder is arranged on the third glue-taking support and is configured to drive the two first glue-taking parts to move away from each other, so that the two first glue-taking parts respectively correspond to two corners of the electrode assembly spaced along the third direction.

37. The covering device according to claim 28, wherein, the covering device further includes a second tape attaching assembly for attaching a second tape to the electrode assembly, the second tape includes a first part and a second part connected to each other, and the second tape attaching assembly is configured to attach the first part of the second tape to the main covering area and attach the second part of the second tape to the side covering area at the corner formed by the side surface and the main surface.

38. The covering device according to claim 37, wherein, the number of the first parts of the second tape is two and located at both ends of the second part of the second tape, and the second tape attaching assembly is configured to attach the two first parts of the second tape to the corresponding one of the two main covering areas respectively.

39. The covering device according to claim 37 or 38, wherein, the second tape attaching assembly includes a second unwinding mechanism, a second tape pulling mechanism and a second cutting mechanism; the second unwinding mechanism is configured to place and release a second tape roll; the second tape pulling mechanism is configured to clamp and pull the leading end of the release portion of the second tape roll; the second cutting mechanism is configured to cut out the second tape from the release portion of the second tape roll.

40. The covering device according to claim 39, wherein, The second glue pulling mechanism includes a second glue clamping cylinder, a second glue pulling motor, and a second glue clamping member; the second glue clamping cylinder is used to drive the second glue clamping member to clamp the head end of the release portion, and the second glue pulling motor is used to drive the second glue clamping member to move to pull the release portion.

41. The covering device according to claim 39, wherein, the second unwinding mechanism and the second cutting mechanism are two corresponding sets and are arranged at intervals in the width direction of the release portion; the second tape attaching assembly includes a glue pulling support, a glue pulling position-changing cylinder, and a glue pulling position-changing support, the glue pulling position-changing cylinder is arranged on the glue pulling support, and the second glue pulling mechanism is arranged on the glue pulling position-changing support; the glue pulling position-changing cylinder is arranged to drive the glue pulling position-changing support to move along the interval direction between the two second unwinding mechanisms, so that the second glue pulling mechanism can be switched between the two sets of second unwinding mechanisms and the second cutting mechanism.

42. The covering device according to claim 39, wherein, the second tape attaching assembly includes a second glue taking mechanism for adsorbing and taking away the second tape; the second cutting mechanism includes a second pressing block, a second cutting knife, and a second cutting cylinder; the second pressing block and the second cutting knife are relatively fixedly arranged; the second cutting cylinder is arranged to drive the second pressing block to press the release portion onto the second glue taking mechanism and drive the second cutting knife to cut out the second tape from the release portion.

43. The covering device according to claim 39, wherein, the second tape attaching assembly includes a second glue taking mechanism for adsorbing and taking away the second tape; the second glue taking mechanism includes a second glue taking member, a fourth glue taking motor, and a fourth glue taking support, the second glue taking member is used for adsorbing the second tape; the fourth glue taking motor is arranged on the fourth glue taking support and drives the second glue taking member to move to the side of the main surface of the release portion and drives the second glue taking member to approach and move away from the plane where the release portion is located.

44. The covering device according to claim 43, wherein, the glue taking member includes a third sub-glue taking portion and a fourth sub-glue taking portion; the third sub-glue taking portion is used for adsorbing the first part of the second tape and attaching it to the main covering area; the fourth sub-glue taking portion is used for adsorbing the second part of the second tape and attaching it to the side covering area.

45. The covering device according to claim 44, wherein, the fourth sub-glue taking portion is a telescopic member; the fourth glue taking motor drives the second glue taking member in the third direction, the fourth sub-glue taking portion presses the second part of the second tape onto the side covering area and contracts, so that the third sub-glue taking portion can continue to move in the third direction and fit the main covering area, and then attach the first part of the second tape to the main covering area.

46. The covering device according to claim 43, wherein, The second unwinding mechanism and the second cutting mechanism are two corresponding sets, and are arranged at intervals along the width direction of the release part; the second glue taking mechanism includes a glue taking displacement cylinder and a glue taking displacement bracket; the glue taking displacement cylinder is arranged on the fourth glue taking bracket, and the second glue taking part is arranged on the glue taking displacement bracket; the glue taking displacement cylinder is configured to drive the glue taking displacement bracket to move along the interval direction of the two second unwinding mechanisms, so that the second glue taking part can be switched between the two second unwinding mechanisms and the second cutting mechanism.

47. The coating equipment according to claim 37 or 38, characterized in that the second tape attaching assembly includes a third positioning assembly, and the third positioning assembly includes a main pressing cylinder, a main pressing part, a side pressing cylinder and a side pressing part; the main pressing cylinder is configured to drive the main pressing part to press the main coating area and the main surface, and the side pressing cylinder is configured to drive the side pressing part to press the side coating area and the side surface.

48. The coating equipment according to claim 47, characterized in that the third positioning assembly includes a rotating motor and a rotating bracket; the main pressing cylinder, the main pressing part, the side pressing cylinder and the side pressing part are arranged on the rotating bracket, and the rotating motor is configured to drive the rotating bracket to rotate; the axis of rotation of the rotating bracket is parallel to the second direction.

49. The coating equipment according to claim 48, characterized in that the second tape attaching assembly includes two second unwinding mechanisms; the third positioning assembly includes a displacement motor and a displacement bracket, and the main pressing cylinder, the main pressing part, the side pressing cylinder, the side pressing part, the rotating motor and the rotating bracket are arranged on the displacement bracket; the displacement motor is configured to drive the displacement bracket to move along the interval direction of the two second unwinding mechanisms.

50. The coating equipment according to any one of claims 1-6, characterized in that the electrode body includes two electrode modules stacked on each other along the first direction, and each electrode module respectively includes a positive electrode plate, a separator and a negative electrode plate arranged in sequence.

51. A coating method for an electrode assembly, characterized in that the electrode assembly includes an electrode body, the electrode body has a first direction, a second direction and a third direction that are perpendicular to each other, and includes two main surfaces arranged opposite to each other along the first direction, two end surfaces arranged opposite to each other along the second direction, and two side surfaces arranged opposite to each other along the third direction, and the coating method includes: positioning the electrode assembly by using a first positioning assembly, and enabling the two main surfaces to be at least partially exposed respectively; positioning a coating film by using a first coating assembly, wherein the coating film includes two main coating areas arranged at intervals from each other and a connecting area connecting the two main coating areas; Control at least one of the first positioning component and the first covering component to move relative to the other, so that the connection area contacts and covers the first one of the two end faces, and the two main covering areas respectively contact and cover the corresponding one of the two main faces on the exposed part of the first positioning component.

52. The covering method according to claim 51, wherein, the control of at least one of the first positioning component and the first covering component to move relative to the other includes: controlling the relative movement of the first positioning component and the first covering component so that the contact time of the connection area with the first one of the two end faces is earlier than the contact time of the two main covering areas with the corresponding one of the two main faces respectively, and / or, controlling the relative movement of the first positioning component and the first covering component so that the covering processes of the two main covering areas on the corresponding one of the two main faces are at least partially synchronized.

53. The covering method according to claim 51, wherein, the control of at least one of the first positioning component and the first covering component to move relative to the other includes: controlling at least one of the first positioning component and the first covering component to move along the second direction so that the electrode component and the covering film approach each other along the second direction, and after the first one of the two end faces contacts the connection area, the electrode component continues to move along the second direction relative to the end parts of the two main covering areas away from the connection area; controlling the first covering component to move along the first direction so that the end parts of the two main covering areas approach each other along the first direction, and further making the two main covering areas contact and cover the exposed parts of the corresponding one of the two main faces.

54. The covering method according to claim 51, wherein, the electrode component includes an ear part, the ear part protrudes from the first one of the two end faces, and an opening is provided on the connection area; the positioning of the covering film by the first covering component includes: positioning the electrode component by the first positioning component so that the ear part faces the connection area; the control of at least one of the first positioning component and the first covering component to move relative to the other includes: controlling the relative movement of the first positioning component and the first covering component so that the ear part passes through the opening with the relative movement between the first positioning component and the first covering component, and the connection area contacts and covers the first one of the two end faces.

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