Electrode assembly coating apparatus and coating method

Abstract

An electrode assembly includes an electrode main body having a first direction, a second direction, and a third direction, and including two main surfaces, two end surfaces, and two side surfaces, and a tab portion disposed on a first of the two end surfaces in a protruding manner, the tab portion being disposed on a second of the two end surfaces in a protruding manner, and the tab portion being disposed on a third of the two end surfaces in a protruding manner. The coating equipment comprises a first coating assembly and a first positioning assembly. The first coating assembly is arranged to position the coating film, the coating film comprises two main coating areas and a connecting area, and an open hole is formed in the connecting area. The first positioning assembly is arranged to position the electrode assembly and enable the tab part to be arranged towards the connecting area. The first positioning assembly and the first coating assembly are arranged to move relatively, so that the tab part passes through the opening along with the relative movement of the first positioning assembly and the first coating assembly, and the connecting area is coated on the first one of the two end surfaces. Through the mode, the interference of the tab part on the coating process can be reduced, and the coating effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery assembly, and particularly 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 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.

[0003] A battery is 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 a coating device to coat the coating film on the electrode assembly. However, in the existing coating process, the presence of the tab of the electrode assembly increases the coating difficulty and results in a poor coating effect. 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 reduce the interference of the tab on the coating process and improve the coating effect.

[0005] In a first aspect, the present application provides a coating device for an electrode assembly. The electrode assembly includes an electrode body and a tab. 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 tab protrudes from the first of the two end surfaces. The coating device includes a first coating component and a first positioning component. The first coating component is configured to position the coating film, wherein the coating film includes two main coating regions that are spaced apart from each other and a connection region that connects the two main coating regions. An opening is provided in the connection region. The first positioning component is configured to position the electrode assembly and orient the tab towards the connection region. 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 tab passes through the opening with the relative movement between the first positioning component and the first coating component, and the connection region contacts and coats the first of the two end surfaces.

[0006] In the above manner, by setting the first positioning component and the first coating component to adjust the relative position relationship between the electrode assembly and the coating film, the relative position relationship between the first of the two end surfaces and the connection region can be adjusted. When the coating film coats the first of the two end surfaces, the stability of the coating process can be improved. By providing an opening in the connection region, the opening can provide an avoidance for the tab, which can reduce the interference of the tab on the coating process, thereby improving the coating effect of the coating film on the first of the two end surfaces.

[0007] In some embodiments, before the first of the two end faces contacts the connection area, the first covering assembly is arranged such that the connection area and the two main covering areas are coplanar with each other.

[0008] 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.

[0009] In some embodiments, at least one of the first positioning assembly and the first covering assembly is arranged to move in the second direction, so that the electrode assembly and the covering film approach each other in the second direction. After the first of the two end faces contacts the connection area, the driving electrode assembly continues to move in the second direction relative to the ends of the two main covering areas away from the connection area. The first covering assembly is arranged to move in the first direction, so that the ends of the two main covering areas approach each other in the first direction, and then the two main covering areas contact and cover the exposed parts of the corresponding one of the two main surfaces.

[0010] In the above manner, by setting the first positioning assembly and the first covering assembly, the relative positional relationship between the two main surfaces and the two covering areas, as well as the relative positional relationship between the first of the two end faces and the connection area, can be adjusted. When the covering film covers the two main surfaces and the first of the two end faces of the electrode body, the stability of the covering process can be improved, and the covering film can be smoothly connected between covering the first of the two end faces and covering the two main surfaces, simplifying the operation of the covering process and being beneficial to improving the covering efficiency.

[0011] In some embodiments, the first positioning assembly includes an electrode clamp, and the electrode clamp is arranged to clamp and fix the electrode body from the outside of the two sides along the third direction, or is arranged to clamp and fix the electrode body from the outside of the two main surfaces along the first direction.

[0012] In the above manner, by arranging the electrode clamp to clamp and fix the electrode body from the outside of the two sides along the third direction, the electrode clamp can avoid the two main surfaces of the electrode body, which is beneficial to increasing the area of the exposed parts of the two main surfaces and improving the covering effect on the two main surfaces. By arranging the electrode clamp to clamp and fix the electrode body from the outside of the two main surfaces along the first direction, it is beneficial to improve the stability of the electrode clamp in clamping and fixing the electrode body.

[0013] In some embodiments, the first positioning assembly includes an electrode driving mechanism, and the electrode driving mechanism is arranged to drive the electrode clamp to move in 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 are driven to continue to move synchronously in the second direction.

[0014] In the above manner, the wrapping film can be smoothly connected between wrapping the first of the two end faces and wrapping the two main faces, simplifying the operation of the wrapping process and facilitating the improvement of the wrapping efficiency.

[0015] 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 disposed on the first electrode bracket and is configured to drive the second electrode bracket to move relative to the first electrode bracket along a second direction. The electrode clamp is disposed on the second electrode bracket and includes an electrode jaw and an electrode clamping cylinder. The electrode clamping cylinder is configured to drive the electrode jaw to clamp and fix the electrode body.

[0016] In the above manner, it is beneficial for the stable movement of the electrode assembly and can improve the accuracy of positioning the electrode assembly.

[0017] In some embodiments, the first wrapping assembly includes two first sub-wrapping assemblies spaced apart from each other. Each first sub-wrapping 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 wrapping film away from the connection area. The first film driving mechanism drives the two film clamps to approach each other along a first direction, so that the area of the main wrapping area not clamped by the film clamps can be bent relative to the connection area toward the corresponding main face.

[0018] In the above manner, it is convenient to control the movement of the main wrapping area, which is beneficial for the area of the main wrapping area not clamped by the film clamps to maintain an extended state, facilitating the operation of wrapping the main face by the main wrapping area, thereby improving the wrapping effect of the main wrapping area on the main face.

[0019] In some embodiments, the first film driving mechanism includes a first film driving motor, a first film bracket, and a second film bracket. The first film driving motor is disposed on the first film bracket and is configured to drive the second film bracket to move relative to the first film bracket along a first direction. The film clamp is disposed on the second film bracket and includes a film jaw and a film clamping cylinder. The film clamping cylinder is configured to drive the film jaw to clamp and fix the wrapping film.

[0020] In the above manner, it is beneficial for the stable movement of the wrapping film and can improve the accuracy of positioning the wrapping film.

[0021] In some embodiments, each first sub-wrapping 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 wrapping film clamped by the film clamps relative to the connection area is consistent with the bending trend of the area of the main wrapping area not clamped relative to the connection area.

[0022] In the above - mentioned manner, the area of the coating film clamped by the film fixture can be made closer to the electrode body, facilitating the coating of the area of the coating film clamped by the film fixture on the electrode body. At the same time, the adverse effect of the area of the coating film clamped by the film fixture on the unclamped area of the main coating area covering the main surface can be reduced, and the risk of the unclamped area of the main coating area falling off from the main surface can be lowered.

[0023] 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 disposed on the first film support and is configured to drive the second film support to move relative to the first film support along a first direction. The second film driving mechanism includes a second film driving motor. The second film driving motor is disposed on the second film support and drives the film fixture to rotate. The film fixture includes film clamping jaws and a film clamping cylinder. The film clamping cylinder is configured to drive the film clamping jaws so that the film clamping jaws clamp and fix the coating film.

[0024] In the above - mentioned manner, the degree of freedom of movement of the coating film can be improved, and the coating effect can be enhanced.

[0025] In some embodiments, each first sub - coating assembly further includes a third film driving mechanism. The two third film driving mechanisms respectively drive the corresponding film fixtures to move along a second direction toward the side where the electrode body is located. Alternatively, the first positioning assembly includes an electrode fixture and an electrode driving mechanism. The electrode fixture is configured to clamp and fix the electrode body. The electrode driving mechanism is configured to drive the electrode fixture to move along the second direction toward the side where the coating film is located 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. The third film driving mechanism is configured to drive the corresponding film fixture to move along the second direction.

[0026] In the above - mentioned 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.

[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 disposed on the first film support and is configured to drive the second film support to move relative to the first film support along a first direction. The third film driving mechanism includes a third film driving motor and a third film support. The third film driving motor is disposed on the second film support and drives the third film support to move relative to the second film support along a second direction. The second film driving mechanism includes a second film driving motor. The second film driving motor is disposed on the third film support and drives the film fixture to rotate. The film fixture includes film clamping jaws and a film clamping cylinder. The film clamping cylinder is configured to drive the film clamping jaws so that the film clamping jaws clamp and fix the coating film.

[0028] In the above manner, the degree of freedom of movement of the coating film can be further improved, and the coating effect can be enhanced.

[0029] In some embodiments, before the first of the two end faces contacts the connection region, the first coating assembly is arranged such that the connection region and the first of the two main coating regions are bent with respect to each other.

[0030] In the above manner, it is beneficial for the structure of the first coating assembly to be compact, reducing the occupied space of the first coating assembly.

[0031] In some embodiments, before the first of the two end faces contacts the connection region, the first coating assembly is arranged such that the connection region and the second of the two main coating regions are coplanar with each other.

[0032] In the above manner, the second of the two main coating regions does not block the connection region, which can reduce the interference of the second of the two main coating regions during the process of the pole ear passing through the opening, and reduce the interference of the second of the two main coating regions during the process of the connection region contacting and coating the first of the two end faces.

[0033] In some embodiments, the first coating assembly includes a first sub - coating assembly and a second sub - coating assembly. The first sub - coating assembly clamps and fixes the end of the coating film away from the first of the two main coating regions, and the second sub - coating assembly is used to support and position the first of the two main coating regions.

[0034] In the above manner, the first sub - coating assembly and the second sub - coating assembly can position the connection region without directly contacting the connection region, thereby reducing the interference during the process of the pole ear passing through the opening and reducing the interference during the process of the connection region contacting and coating the first of the two end faces.

[0035] In some embodiments, the first positioning assembly is arranged to move along a second direction so that the first of the two end faces contacts the connection region, and the first positioning assembly is further arranged to move along a first direction so that the first of the two main faces contacts the first of the two main coating regions. The first sub - coating assembly is arranged to move along the first direction and the second direction so that the second of the two main coating regions contacts the second of the two main faces.

[0036] In the above manner, the relative positional relationship between the electrode assembly and the coating film can be adjusted. When the coating film coats the two main faces and the first of the two end faces of the electrode body, continuous coating of the two main faces and the first of the two end faces can be achieved, improving the stability of the coating process and making the coating operation more concise and smooth.

[0037] In some embodiments, the coating film includes a side coating area connected to the main coating area, and the coating device further includes a second coating assembly configured to drive the side coating area into contact with and coat on the side surface.

[0038] In the above manner, the second coating assembly can adjust the relative positional relationship between the electrode assembly and the side coating area. By arranging the second coating assembly to coat the side coating area on the side surface, the coating effect of the coating film on the electrode body can be improved.

[0039] In some embodiments, the second coating assembly includes a side pressing plate, a first pressing plate driving mechanism, and a second pressing plate driving mechanism. The first pressing plate driving mechanism is configured to drive the side pressing plate in a first direction so that the side pressing plate pushes the side coating area to bend relative to the main coating area toward the side surface, and the second pressing plate driving mechanism is configured to drive the side pressing plate in a third direction so that the side pressing plate presses the side coating area against the side surface.

[0040] In the above manner, the actions of bending the side coating area and coating the side coating area on the side surface by the second coating assembly can be smoothly connected, which is beneficial to simplifying the actions and structure of the second coating assembly and improving the coating efficiency.

[0041] In some embodiments, the coating film includes an end coating area connected to the main coating area, and the second coating assembly is configured to drive the end coating area into contact with and coat on the second of the two end surfaces.

[0042] In the above manner, the second coating assembly can adjust the relative positional relationship between the electrode assembly and the end coating area. By arranging the second coating assembly to coat the end coating area on the second of the two end surfaces, the coating effect of the coating film on the electrode body can be improved.

[0043] In some embodiments, the second coating 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 configured to drive the end face pressing plate in a first direction so that the end face pressing plate pushes the end coating area to bend relative to the main coating area toward the second of the two end surfaces, and the third pressing plate driving mechanism is configured to drive the end face pressing plate in a second direction so that the end face pressing plate presses the end coating area against the second of the two end surfaces.

[0044] In the above manner, the coating action can be simplified, enabling the end coating area to coat the second of the two end surfaces.

[0045] In some embodiments, the first platen transmission mechanism includes a platen drive motor, a first platen bracket, and a second platen bracket. The platen drive motor is disposed on the first platen bracket and drives the second platen bracket to move relative to the first platen bracket. The second platen transmission mechanism includes a first platen cylinder, and the first platen cylinder is disposed on the second platen bracket. The first platen cylinder drives the side platen to move relative to the second platen bracket. The third platen transmission mechanism includes a second platen cylinder, and the second platen cylinder is disposed on the second platen bracket. The second platen cylinder drives the end platen to move relative to the second platen bracket.

[0046] In the above manner, the degrees of freedom of movement of the side platen and the end platen can be increased, which is beneficial to improving the coating effect.

[0047] In some embodiments, the coating film further includes a side coating area and an end coating area connected to the main coating area. 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.

[0048] 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 film on the electrode body.

[0049] 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.

[0050] In the above manner, it is beneficial to automatically provide the first tape.

[0051] 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.

[0052] 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.

[0053] 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 release portion is located.

[0054] In the above manner, it is beneficial to quickly perform the reel changing operation of the first tape roll, and the reel changing efficiency can be improved.

[0055] 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 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 tape picking mechanism and drive the first cutting knife to cut out the first tape from the release portion.

[0056] In the above manner, the first pressing block can press and position the release portion, and the stability of the cutting process can be improved.

[0057] 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 support, and a second tape picking support. The first tape picking member is used for adsorbing the first tape. The first tape picking motor is arranged on the first tape picking support and drives the second tape picking support 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 support and drives the first tape picking member to approach and move away from the plane where the release portion is located.

[0058] In the above manner, the movement freedom of the first tape picking member can be improved, facilitating the sucking and transferring of the first tape.

[0059] 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 used for adsorbing the first part of the first tape and attaching it to the side covering area. The second sub-tape picking portion is used for adsorbing the second part of the first tape and attaching it to the end covering area.

[0060] In the above manner, the coherence of the tape picking action and the tape attaching action can be improved.

[0061] In some embodiments, the first sub-tape picking part is a telescopic member. The second tape picking motor drives the first tape picking member in the third direction. The first sub-tape picking part presses and holds the first part of the first tape on the side covering area and contracts, so that the second sub-tape picking part 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. Alternatively, the second sub-tape picking part is a telescopic member. The second tape picking motor drives the first tape picking member in the second direction. The second sub-tape picking part is used to press and hold the second part of the first tape on the end covering area and contract, so that the first sub-tape picking 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.

[0062] In the above manner, the structural flexibility of the first tape picking member can be improved, so that the first tape picking member can adaptively adjust its shape according to the shape of the electrode body, thereby realizing diversified tape attaching actions.

[0063] In some embodiments, the first cutting mechanism is arranged to cut out two first tapes from the released part. The first tape attaching assembly includes a first tape picking mechanism. The first tape picking mechanism is used to adsorb and pick 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, a second tape picking bracket, a third tape picking bracket, and a glue dividing cylinder. The number of the first tape picking members is two, and each adsorbs a corresponding 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 released part. The second tape picking motor is arranged 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 released part is located. The glue dividing cylinder is arranged on the third tape picking bracket, and the glue dividing cylinder is arranged 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.

[0064] 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 at two corners of the electrode assembly spaced apart in the third direction at the same time, improving the tape attaching efficiency.

[0065] In some embodiments, the coating device further includes a second tape attaching assembly. The second tape attaching assembly is used to attach a second tape to the electrode assembly. The second tape includes a first part and a second part connected to each other. The second tape attaching assembly is arranged to attach the first part of the second tape to the main coating area and attach the second part of the second tape to the side coating area at the corner formed by the side surface and the main surface.

[0066] In the above manner, the second tape can connect one of the side covering area and the main covering area together, enabling the side covering area and the main covering area to be fixed relative to the electrode body, thereby improving the firmness of the covering film on the electrode body.

[0067] In some embodiments, the number of the first parts of the second tape is two, and they are located at both ends of the second part of the second tape. 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.

[0068] In the above manner, the contact area between the second tape and the covering film can be increased, and the fixing effect on the side covering area can be improved.

[0069] In some embodiments, 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 the second tape roll. The second tape pulling mechanism is configured to clamp and pull the leading end of the released part of the second tape roll. The second cutting mechanism is configured to cut out the second tape from the released part of the second tape roll.

[0070] In the above manner, it is beneficial to automatically provide the second tape.

[0071] 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 released part, and the second tape pulling motor is used to drive the second tape clamping member to move to pull the released part.

[0072] In the above manner, the released part of the second tape roll can be extended, and the released part of the second tape roll is stretched to facilitate cutting.

[0073] 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 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 configured to drive the tape pulling position-changing support to move along the interval direction of 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.

[0074] 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 on the tape pulling process can be reduced, and the tape pulling efficiency can be improved. By configuring the tape pulling position-changing cylinder to drive the tape pulling position-changing support to move along the interval direction of the two second unwinding mechanisms, the position of the tape pulling mechanism can correspond to the position of the set of second unwinding mechanisms and the second cutting mechanism that is working, facilitating the tape pulling operation.

[0075] In some embodiments, the second tape attaching assembly includes a second tape picking mechanism for adsorbing and picking up the second tape. The second cutting mechanism includes a second pressing block, a second cutter, and a second cutting cylinder. The second pressing block and the second cutter are relatively fixedly arranged. The second cutting cylinder is configured to drive the second pressing block to press the release portion onto the second tape picking mechanism and drive the second cutter to cut out the second tape from the release portion.

[0076] In the above manner, the second pressing block can press and position the release portion, improving the stability of the cutting process.

[0077] In some embodiments, the second tape attaching assembly includes a second tape picking mechanism for adsorbing and picking 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 for adsorbing the second tape. The fourth tape picking motor is disposed on the fourth tape picking support and is configured to drive the second tape picking member to move to the side of the main surface of the release portion and to drive the second tape picking member to approach and move away from the plane where the release portion is located.

[0078] In the above manner, the degree of freedom of movement of the second tape picking member can be improved, facilitating the picking and transfer of the second tape.

[0079] In some embodiments, the second tape picking member includes a third sub-tape picking portion and a fourth sub-tape picking portion. The third sub-tape picking portion is used for adsorbing the first portion of the second tape and attaching it to the main covering area. The fourth sub-tape picking portion is used for adsorbing the second portion of the second tape and attaching it to the side covering area.

[0080] In the above manner, the coherence of the tape picking action and the tape attaching action can be improved.

[0081] In some embodiments, the fourth sub-tape picking portion is a telescopic member. The fourth tape picking motor drives the second tape picking member in the third direction. The fourth sub-tape picking portion is used for pressing the second portion of the second tape onto the side covering area and contracting, so that the third sub-tape picking portion can continue to move in the third direction and fit the main covering area, and then attach the first portion of the second tape to the main covering area.

[0082] In the above manner, the structural flexibility of the second tape picking member can be improved, enabling the second tape picking member to adaptively adjust its shape according to the shape of the electrode body, thus realizing diverse tape attaching actions.

[0083] In some embodiments, there are two corresponding sets of the second unwinding mechanism and the second cutting mechanism, which are arranged at intervals along the width direction of the release part. The second glue-taking mechanism includes a glue-taking position-changing cylinder and a glue-taking position-changing bracket. The glue-taking position-changing cylinder is arranged on the fourth glue-taking bracket, and the second glue-taking member is arranged on the glue-taking position-changing bracket. The glue-taking position-changing cylinder is configured to drive the glue-taking position-changing bracket to move along the interval direction between the two second unwinding mechanisms, so that the second glue-taking member can be switched between the two sets of second unwinding mechanisms and the second cutting mechanism.

[0084] In the above manner, by arranging the glue-taking position-changing cylinder to drive the glue-taking position-changing bracket to move along the interval direction between the two second unwinding mechanisms, the position of the second glue-taking member can correspond to the position of the set of second unwinding mechanisms and the second cutting mechanism that is working, facilitating the glue-taking operation.

[0085] In some embodiments, the electrode body includes two electrode modules stacked on each other in a first direction, and each electrode module includes a positive electrode plate, a separator, and a negative electrode plate stacked.

[0086] 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.

[0087] In some embodiments, the coating device further includes a turntable configured to rotate around a predetermined rotation axis. The number of the first coating assemblies is at least two, and they are arranged at intervals around the rotation axis on the turntable. The turntable drives the at least two first coating assemblies to sequentially pass through the first positioning assembly.

[0088] In the above manner, it is convenient to arrange circuits and gas paths on the turntable. By arranging the turntable to drive the at least two first coating assemblies to sequentially pass through the first positioning assembly, it is convenient to control the movement of the first coating assemblies and at the same time facilitate the positioning of the coating film by the first coating assemblies.

[0089] In a second aspect, the present application provides a method for coating an electrode assembly. The electrode assembly includes an electrode body and an electrode tab. 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 arranged opposite to each other in the first direction, two end surfaces arranged opposite to each other in the second direction, and two side surfaces arranged opposite to each other in the third direction. The electrode tab protrudes from the first of the two end surfaces. The coating method includes: positioning the coating film by using the 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, and an opening is provided on the connection region. Positioning the electrode assembly by using the first positioning assembly and arranging the electrode tab to face the connection region. Controlling at least one of the first positioning assembly and the first coating assembly to move relative to the other, so that the electrode tab passes through the opening, and the connection region contacts and coats the first of the two end surfaces.

[0090] In some embodiments, positioning the coating film by using the first coating assembly includes: before the first of the two end faces contacts the connection area, controlling the first coating assembly so that the connection area and the two main coating areas are coplanar with each other.

[0091] In some embodiments, controlling the movement of at least one of the first positioning assembly and the first coating assembly relative to the other includes: controlling at least one of the first positioning assembly and the first coating assembly to move closer to each other in the second direction, so that after the first of the two end faces contacts the connection area, the electrode assembly continues to move in the second direction relative to the ends of the two main coating areas away from the connection area. Controlling the first coating assembly to move in the first direction, so that the ends of the two main coating areas approach each other, and further making the two main coating areas contact and cover the exposed part of the corresponding one of the two main surfaces.

[0092] In some embodiments, positioning the coating film by using the first coating assembly includes: before the first of the two end faces contacts the connection area, controlling the first coating assembly so that the connection area and the first of the two main coating areas are bent relative to each other.

[0093] In some embodiments, the first coating assembly includes a first sub-coating assembly and a second sub-coating assembly. The first sub-coating assembly clamps and fixes the end of the coating film away from the first of the two main coating areas, and the second sub-coating assembly is used to support and position the first of the two main coating areas. Controlling the relative movement of the electrode assembly and the coating film by at least one of the first positioning assembly and the first coating assembly includes: controlling the first positioning assembly to move in the second direction so that the first of the two end faces contacts the connection area. Controlling the first positioning assembly to move in the first direction so that the first of the two main surfaces contacts the first of the two main coating areas. Controlling the first sub-coating assembly to move in the first direction and the second direction so that the end of the coating film away from the first of the two main coating areas makes the second of the two main coating areas contact the second of the two main surfaces.

[0094] 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 describes the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] 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:

[0096] Figure 1 Schematic structural diagram of a vehicle to which an electrode assembly according to one or more embodiments is applied;

[0097] Figure 2 Exploded structural diagram of a battery in which an electrode assembly according to one or more embodiments is located;

[0098] Figure 3 Exploded structural diagram of a battery cell in which an electrode assembly according to one or more embodiments is located;

[0099] Figure 4 Partial structural diagram of an electrode assembly according to one or more embodiments;

[0100] Figure 5 Schematic structural diagram of a first positioning component and a first wrapping component driving a wrapping film and an electrode assembly according to one or more embodiments;

[0101] Figure 6 Schematic simplified diagram of a first positioning component and a first wrapping component driving a wrapping film and an electrode assembly according to one or more embodiments;

[0102] Figure 7 Schematic process diagram of a wrapping film wrapping an electrode assembly according to one or more embodiments;

[0103] Figure 8 Schematic structural diagram of a first positioning component according to one or more embodiments;

[0104] Figure 9 Partial structural diagram of a first wrapping component according to one or more embodiments;

[0105] Figure 10 Another schematic simplified diagram of a first positioning component and a first wrapping component driving a wrapping film and an electrode assembly according to one or more embodiments;

[0106] Figure 11 Schematic structural diagram of a first sub - wrapping component driving a bent wrapping film according to one or more embodiments;

[0107] Figure 12 Another schematic process diagram of a wrapping film wrapping an electrode assembly according to one or more embodiments;

[0108] Figure 13 Schematic structural diagram of a second wrapping component driving a wrapping film and an electrode assembly according to one or more embodiments;

[0109] Figure 14 Schematic structural diagram of a second wrapping component according to one or more embodiments;

[0110] Figure 15 The Figure 13 structural schematic diagram of the second covering component driving the covering film and part A of the electrode component as shown;

[0111] Figure 16 structural schematic diagram of a covering device according to one or more embodiments;

[0112] Figure 17 structural schematic diagram of a covering film and an electrode component with a first tape and a second tape attached according to one or more embodiments;

[0113] Figure 18 structural schematic diagram of a first tape attaching component according to one or more embodiments;

[0114] Figure 19 cooperating structural schematic diagram of a first unwind mechanism, a first glue feeding mechanism and a first tape roll according to one or more embodiments;

[0115] Figure 20 structural schematic diagram of a first glue taking mechanism according to one or more embodiments;

[0116] Figure 21 partial structural schematic diagram of a first glue pulling mechanism according to one or more embodiments;

[0117] Figure 22 structural schematic diagram of a first cutting mechanism according to one or more embodiments;

[0118] Figure 23 structural schematic diagram of a first glue taking member adsorbing a first tape according to one or more embodiments;

[0119] Figure 24 structural schematic diagram of a second tape attaching component according to one or more embodiments;

[0120] Figure 25 cooperating structural schematic diagram 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;

[0121] Figure 26 structural schematic diagram of a second glue pulling mechanism according to one or more embodiments;

[0122] Figure 27 structural schematic diagram of a second glue taking mechanism adsorbing a second tape according to one or more embodiments;

[0123] Figure 28 The Figure 27 partial structural schematic diagram of the second glue taking mechanism adsorbing the second tape as shown;

[0124] Figure 29 Schematic structural diagram of a second cutting mechanism according to one or more embodiments;

[0125] Figure 30 Schematic structural diagram of a third positioning component positioning an electrode component according to one or more embodiments;

[0126] Figure 31 Schematic structural diagram of an electrode component according to one or more embodiments.

[0127] The reference numerals in the specific embodiments are as follows:

[0128] 1000a vehicle;

[0129] 100a battery; 200a controller; 300a motor;

[0130] 10a box body; 11a first sub-box body; 12a second sub-box body; 101b accommodation space; 1 battery cell;

[0131] 100 housing; 110 accommodation housing; 112 open end; 120 end cap; 200 electrode assembly;

[0132] 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 221; 222 separator; 223 negative electrode plate 223; 230 fixing member;

[0133] 300 coating equipment; 301 coating film feeding mechanism; 302 electrode assembly discharging mechanism; 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 bracket; 3142 second electrode bracket;

[0134] 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 bracket; 338 film jaw; 339 fourth film bracket; 340 second film driving motor; 341 third film driving motor; 342 second film bracket; 343 third film bracket; 344 second sub-coating component; 350 turntable; 351 sliding track; 353 electrode assembly picking mechanism; 354 electrode assembly shaping mechanism; 355 defective product discharging mechanism; 360 flipping 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;

[0135] 370 Second covering component; 371 Side pressing plate; 372 First pressing plate driving mechanism; 373 Second pressing plate driving mechanism; 374 End face pressing plate; 3741 End limiting block; 3711 Side limiting block; 375 Third pressing plate driving mechanism; 376 First pressing plate cylinder; 3761 Second pressing plate cylinder; 377 Pressing plate driving motor; 378 First pressing plate support; 379 Second pressing plate support;

[0136] 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 support; 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 support; 3865 Second glue taking support; 3866 First sub - glue taking part; 3867 Second sub - glue taking part; 3868 Third glue taking support; 3869 Glue distributing cylinder; 387 First glue feeding mechanism;

[0137] 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 support; 3941 Tape pulling position - changing cylinder; 3942 Tape pulling position - changing support; 395 Second glue taking mechanism; 3951 Second glue taking member; 3952 Fourth glue taking motor; 3953 Fourth glue taking support; 3954 Third sub - glue taking part; 3955 Fourth sub - glue taking part; 3956 Glue taking position - changing cylinder; 3957 Glue taking position - changing support; 396 Second tape roll; 397 Second glue feeding mechanism;

[0138] 400 Coating film; 410 Main coating area; 420 Connection area; 421 Opening; 430 Side coating area; 440 End coating area; 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;

[0139] D1 First direction; D2 Second direction; D3 Third direction; D4 Width direction of the release part; D5 Spacing direction between two second unwinding mechanisms; D6 Thickness direction of the release part. Detailed implementation mode

[0140] 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 more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0141] 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 specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0142] In the description of the embodiments of the present 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 the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0143] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase does not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0144] In the description of the embodiments of the present 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 can represent: 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.

[0145] In the description of the embodiments of the present 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).

[0146] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "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, and therefore cannot be construed as a limitation on the embodiments of the present application.

[0147] 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 situations.

[0148] 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.

[0149] 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, in the existing coating process, the presence of the tab of the electrode assembly increases the coating difficulty and results in a poor coating effect.

[0150] In order to reduce the coating difficulty and improve the coating effect, 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 tab passes through the opening, and the connection area contacts and coats on the first of the two end faces. The first positioning assembly is set to position the electrode assembly, so that the position and posture of the electrode assembly can be kept stable and controlled. The first coating assembly is set to position the coating film, so that the positions and postures of the two main coating areas and the connection area can be kept stable and controlled. Setting at least one of the first positioning assembly and the first coating assembly to drive the electrode assembly and the coating film to move relative to each other can adjust the relative positional relationship between the two main surfaces and the two coating areas, and adjust the relative positional relationship between the first of the two end faces and the connection area. Setting the tab towards the connection area facilitates passing the tab through the opening.

[0151] 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 and a tab. 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 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 tab protrudes from the first of the two end surfaces. The coating device includes a first coating assembly and a first positioning assembly. The first coating assembly is configured to position the coating film, 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, and an opening is provided in the connection region. The first positioning assembly is configured to position the electrode assembly and arrange the tab facing the connection region. 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 tab passes through the opening along with the relative movement between the first positioning assembly and the first coating assembly, and the connection region contacts and coats the first of the two end surfaces. In this way, by setting the first positioning assembly and the first coating assembly to adjust the relative positional relationship between the electrode assembly and the coating film, the relative positional relationship between the first of the two end surfaces and the connection region can be adjusted, and the stability of the coating process can be improved when the coating film coats the first of the two end surfaces. By providing an opening in the connection region, the opening can avoid the tab, which can reduce the interference of the tab on the coating process, thereby improving the coating effect of the coating film on the first of the two end surfaces.

[0152] 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 arranged 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.

[0153] For the convenience of description, the following embodiments will be described by taking a vehicle 1000a, which is an electrical device in an embodiment of the present application, as an example.

[0154] Please refer to Figure 1, the 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] In the embodiments of the present application, the battery cell 1 can be a secondary battery, which 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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 become at least a part of the floor of the vehicle 1000a, or a part of the box body 10a can become at least a part of the cross beams and longitudinal beams of the vehicle 1000a.

[0163] 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 various shapes, such as a cylinder, a cuboid, etc.

[0164] 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.

[0165] Please refer to Figure 3 , the battery cell 1 refers to the smallest unit that makes up the 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.

[0166] 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.

[0167] 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 electrode terminals can be provided on the end cap 120. The electrode terminal 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 also 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.

[0168] 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, and when it is necessary to encapsulate the inside of the receiving shell 110, the end cap 120 is then made to cover 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.

[0169] Optionally, the battery cell 1 includes a shell 100, a bottom cover and an electrode assembly 200. The shell 100 has an open end 112, and a pole is arranged on the wall of the shell 100 opposite to the open end 112, and the pole has a through hole, and the shell and the bottom cover are connected to form a receiving cavity connected to the through hole. The active material coating part of the electrode assembly 200 is arranged in the shell 100, and the pole ear part 201 of the electrode assembly 200 passes through the through hole and is connected to the side of the pole away from the receiving cavity.

[0170] The electrode assembly 200 is a component where an electrochemical reaction occurs in the battery cell 1. One or more electrode assemblies 200 may be contained in the housing 110.

[0171] In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting and allow the active ions to pass through. The separator can be a diaphragm.

[0172] In some embodiments, please refer to Figure 4 The positive electrode may be a positive electrode sheet 221 , and the positive electrode sheet 221 may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0173] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0174] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (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.).

[0175] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4 ), at least one of a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of the lithium transition metal oxide 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.

[0176] In some embodiments, referring to Figure 4 , the negative electrode can be the negative electrode tab 223, and the negative electrode tab 223 can include a negative electrode current collector.

[0177] 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 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 substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0178] As an example, the negative electrode sheet 223 can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0179] 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 disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0180] As an example, the negative electrode active material can be the negative electrode active material known in the art for the battery cell 1. 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 the negative electrode active material of the battery can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0181] 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.

[0182] In some embodiments, the electrode assembly 200 further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0183] In some embodiments, the separator is a separator 222. The present application does not particularly limit the type of the separator 222, and any separator 222 with a porous structure having good chemical stability and mechanical stability known in the art can be selected.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] Among them, the electrolyte solution can be a form of the electrolyte. The electrolyte solution can include an electrolyte salt and a solvent.

[0188] 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 difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0189] 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.

[0190] Among them, the gel-like electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0191] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0192] 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.

[0193] 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.

[0194] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0195] 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.

[0196] In some embodiments, the electrode assembly 200 is provided with a tab portion 201, and the tab portion 201 can conduct the current out of the electrode assembly 200. The tab portion 201 includes a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab can be commonly located at one end of the electrode body or respectively located at both ends of the electrode body.

[0197] According to some embodiments of the present application, such as Figures 5 to 7As 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 and a tab 201. 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 tab 201 protrudes from the first one 212a of the two end surfaces 212. The coating device 300 includes a first coating assembly 330 and a first positioning assembly 310. 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 connected between the two main coating regions 410, and an opening 421 is provided on the connection region 420. The first positioning assembly 310 is configured to position the electrode assembly 200 and to orient the tab 201 toward the connection region 420. 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 tab 201 passes through the opening 421 with the relative movement between the first positioning assembly 310 and the first coating assembly 330, and the connection region 420 contacts and coats the first one 212a of the two end surfaces 212.

[0198] By providing the first positioning assembly 310 and the first coating assembly 330 to adjust the relative positional relationship between the electrode assembly 200 and the coating film 400, the relative positional relationship between the first one 212a of the two end surfaces 212 and the connection region 420 can be adjusted, and the stability of the coating process can be improved when the coating film 400 coats the first one 212a of the two end surfaces 212. Specifically, the first positioning assembly 310 positions the electrode assembly 200 so that the tab 201 faces the connection region 420 and is arranged with the connection region 420, and then 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 so that the tab 201 gradually approaches the connection region 420, and then the tab can pass through the opening 421, and finally the connection region 420 can contact and coat the first one 212a of the two end surfaces 212.

[0199] Due to the presence of the tab 201, the difficulty of coating the first one 212a of the two end surfaces 212 with the coating film 400 is increased. By providing the opening 421 on the connection region 420, the opening 421 can form an avoidance for the tab 201, which can reduce the interference of the tab 201 on the coating process, thereby improving the coating effect of the coating film 400 on the first one 212a of the two end surfaces 212.

[0200] When the electrode assembly 200 is loaded into the housing 100, the tab portion 201 and the opening of the housing 100 may be first arranged opposite to and spaced apart from each other 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 portion 201 and the first one 212a of the two end faces 212 sequentially enter the housing 100. 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 one 212a of the two end faces 212, making it smoother when the first one 212a of the two end faces 212 enters 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.

[0201] Further, no tab portion 201 is provided on the two main surfaces 211, the two side surfaces 213 of the electrode body 210, and the second one 212b of the two end faces 212. The covering device 300 controls the covering film 400 to cover the first one 212a of the two end faces 212 earlier than the covering device 300 controls the covering film 400 to cover the second one 212b of the two end faces 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 covering film 400 covering the electrode body 210, a fixing operation needs to be performed on the edge of the covering film 400 so that the covering film 400 can be fixed on the electrode body 210. The covering device 300 controlling the covering film 400 to first cover the first one 212a of the two end faces 212 can make the edge of the covering film 400 fall outside the first one 212a of the two end faces 212, so that the tab portion 201 will not interfere with the fixing operation on the edge of the covering film 400, improving the covering effect of the covering film 400 on the electrode body 210. In addition, the edge of the covering film 400 falls outside the first one 212a of the two end faces 212, which can reduce the risk that the edge of the covering film 400 is squeezed and detached from the electrode body 210 when the first one 212a of the two end faces 212 enters the housing 100, and can facilitate the loading of the electrode assembly 200 into the housing 100.

[0202] 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 connection area 420, the first covering assembly 330 is arranged such that the connection area 420 and the two main covering areas 410 are coplanar with each other.

[0203] By setting the connection 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 feeding of the covering film 400. For example, the first covering assembly 330 stretches the covering film 400 by pulling it, so that the connection area 420 and the two main covering areas 410 are coplanar with each other.

[0204] 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 covering assembly 330 is arranged to move along the second direction D2, so that the electrode assembly 200 and the covering film 400 approach each other along the second direction D2, and after the first one 212a of the two end faces 212 contacts the connection area 420, the driving electrode assembly 200 continues to move along the second direction D2 relative to the end parts of the two main covering areas 410 away from the connection area 420. The first covering assembly 330 is arranged to move along the first direction D1, so that the end parts of the two main covering areas 410 approach each other along the first direction D1, and further make the two main covering areas 410 contact and cover the exposed parts of the corresponding one of the two main faces 211.

[0205] The first positioning assembly 310 and the first covering assembly 330 can drive the electrode assembly 200 and the covering film 400 to approach each other. The first covering assembly 330 can drive the end parts of the two main covering areas 410 to approach each other respectively. The first one 212a of the two end faces 212 can be connected between the two main faces 211 of the electrode body 210, so that the connection area 420 covers the first one 212a of the two end faces 212 and the two main covering areas 410 can respectively cover the two main faces 211. In some embodiments, the two main covering areas 410 are respectively movable relative to the connection area 420, so that when the connection area 420 covers the first one 212a of the two end faces 212, the two main covering areas 410 can cover the two main faces 211 by moving relative to the connection area 420. The first covering assembly 330 can be arranged to be able to drive the two main covering areas 410 to move relative to the connection area 420 respectively.

[0206] 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 one 212b of the two end faces 212. 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 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 one 212b of the two end faces 212, the two main faces 211 can be respectively fully exposed.

[0207] Specifically, the first positioning component 310 can drive the electrode component 200 to approach the coating film 400 along the second direction D2, or the first coating component 330 can drive the coating film 400 to approach the electrode component 200 along the second direction D2, or while the first positioning component 310 drives the electrode component 200 to approach the coating film 400 along the second direction D2, the first coating component 330 drives the coating film 400 to approach the electrode component 200 along the second direction D2, so that the electrode component 200 and the coating film 400 approach each other along the second direction D2 until the first of the two end faces 212, i.e., 212a, contacts the connection area 420 and is coated.

[0208] Along the second direction D2, the two main surfaces 211 can be connected between the two end faces 212. After the first of the two end faces 212, i.e., 212a, contacts the connection area 420, by driving the electrode component 200 to continue moving along the second direction D2 relative to the end of the two main coating areas 410 away from the connection area 420, it can be made 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 parts of the main surfaces 211. At this time, the first coating component 330 can make the two main coating areas 410 contact and coat the exposed parts of the corresponding one of the two main surfaces 211 by driving the ends of the two main coating areas 410 to approach each other along the first direction D1.

[0209] By providing the first positioning component 310 and the first coating component 330, the relative position relationship between the two main surfaces 211 and the two coating 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 coating film 400 coats the two main surfaces 211 of the electrode body 210 and the first of the two end faces 212, i.e., 212a, the stability of the coating process can be improved, and the coating film 400 can be smoothly connected between coating the first 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.

[0210] According to some embodiments of the present application, optionally, as Figure 5 and Figure 8 shown, the first positioning component 310 includes an electrode fixture 311. The electrode fixture 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.

[0211] When the electrode fixture 311 clamps and fixes the electrode body 210, the electrode fixture 311 and the electrode body 210 can be relatively fixed. By setting the electrode fixture 311 to clamp and fix the electrode body 210, the first positioning assembly 310 can position the electrode assembly 200. By setting the electrode fixture 311 to clamp and fix the electrode body 210 from the outside of the two sides 213 along the third direction D3, the electrode fixture 311 can avoid the two main surfaces 211 of the electrode body 210, which is beneficial to increasing the exposed area of the two main surfaces 211 and improving the coating effect on the two main surfaces 211. The area of the two main surfaces 211 is larger than the area of the two sides 213. By setting the electrode fixture 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 fixture 311 in clamping and fixing the electrode body 210.

[0212] Further, the electrode body 210 includes two electrode modules 220 as described below. By setting the electrode fixture 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 fixture 311 in clamping and fixing the electrode body 210.

[0213] Optionally, as Figure 5 and Figure 8 shown, 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.

[0214] According to some embodiments of the present application, optionally, as Figure 5 and Figure 8 shown, the first positioning assembly 310 includes an electrode driving mechanism 312. The electrode driving mechanism 312 is configured to drive the electrode fixture 311 to move along the second direction D2, 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 are driven to continue to move synchronously along the second direction D2.

[0215] The electrode driving mechanism 312 can drive the electrode assembly 200 to move along the second direction D2 towards the side where the coating film 400 is located. 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.

[0216] Further, the electrode driving mechanism 312 can be drivingly connected to 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.

[0217] Optionally, as Figure 5 and Figure 8 shown, 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, so as to drive the electrode assembly 200 to move along the second direction D2.

[0218] According to some embodiments of the present application, optionally, as Figure 5 and Figure 8 shown, 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 so that the electrode jaw 3131 clamps and fixes the electrode body 210.

[0219] With such an arrangement, it is beneficial to the stable movement of the electrode assembly 200 and can improve the positioning accuracy of the electrode assembly 200.

[0220] In some embodiments, the first covering assembly 330 includes a support frame, a support driving mechanism, and two spaced-apart support plates. The support driving mechanism and the two support plates are arranged on the support frame. One end of each support plate is rotatably connected to the support frame. The support driving 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 a support plane. In the flat state, the two support planes face the same direction and are coplanar, and the two support planes are used to respectively 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.

[0221] Optionally, the two support plates respectively have an adsorption structure, and the adsorption structure is used to keep the main covering area 410 and the support plate relatively fixed by adsorbing the main covering area 410.

[0222] According to some embodiments of the present application, optionally, as Figures 5 to 7 and Figure 9 shown, the first covering assembly 330 includes two first sub-covering assemblies 331 arranged at intervals from each other. Each first sub-covering assembly 331 respectively includes a film clamp 332 and a first film driving mechanism 333. The two film clamps 332 respectively clamp and fix the two ends of the covering film 400 far from the connection area 420. The first film driving 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 clamps 332 can be bent relative to the connection area 420 toward the corresponding main surface 211.

[0223] In some embodiments, the two ends of the covering film 400 far from the connection area 420 may be located in the two main covering areas 410. At this time, the main covering areas 410 are covered and clamped by the film clamps 332. In some other embodiments, the two ends of the covering film 400 far from the connection area 420 may be located outside the two main covering areas 410. At this time, the main covering areas 410 are not clamped by the film clamps 332. For example, the covering film 400 includes the following end covering area 440, and the two ends of the covering film 400 far from the connection area 420 may be located in the end covering area 440.

[0224] When the first film driving mechanism 333 drives the 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 far from the connection area 420 to approach each other, thereby driving the two main covering areas 410 to approach the corresponding main surface 211. When the main covering area 410 approaches the corresponding main surface 211, the area of the main covering area 410 not clamped by the film clamps 332 can be bent relative to the connection area 420.

[0225] In the first direction D1, the acting forces respectively 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 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 not clamped by the film clamps 332 to be bent.

[0226] By setting two film clamps 332 to respectively clamp and fix both ends of the coating film 400 away from the connection area 420, it is convenient to control the movement of the main coating area 410, which is beneficial for the area of the main coating area 410 not clamped by the film clamp 332 to maintain an extended state, facilitating the operation of the main coating area 410 to coat the main surface 211, thereby improving the coating effect of the main coating area 410 on the main surface 211.

[0227] Optionally, as Figure 5 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 coating film 400.

[0228] Optionally, as Figure 5 and Figure 9 shown, the first film transmission mechanism 333 includes a first film transmission motor 337. Two first film transmission motors 337 are used to drive the two film clamps 332 to approach each other along the first direction D1. Specifically, the first film transmission mechanism 333 further includes a lead screw and a slider. The first film transmission 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 transmission 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.

[0229] Optionally, as Figure 5 and Figure 9 shown, each film clamp 332 has two film jaws 338, and each film jaw 338 is used to clamp a corner of the coating film 400. Four film jaws 338 respectively clamp the four corners of the coating film 400.

[0230] According to some embodiments of the present application, optionally, as Figure 5 and Figure 9 shown, the first film transmission mechanism 333 includes a first film transmission motor 337, a first film bracket 3371 and a second film bracket 342. The first film transmission motor 337 is arranged on the first film bracket 3371, and the first film transmission motor 337 is arranged to drive the second film bracket 342 to move relative to the first film bracket 3371 along the first direction D1. The film clamp 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 arranged to drive the film jaw 338 so that the film jaw 338 clamps and fixes the coating film 400.

[0231] With such a setting, it is beneficial for the stable movement of the coating film 400 and can improve the accuracy of positioning the coating film 400.

[0232] According to some embodiments of the present application, optionally, as Figures 5 to 7 and Figure 9 shown, each first sub-cladding assembly 331 further includes a second film driving mechanism 334 respectively. The two second film driving mechanisms 334 drive the corresponding film clamps 332 to rotate respectively, so that the movement trend of the area of the cladding film 400 clamped by the film clamps 332 relative to the connection area 420 is consistent with the bending trend of the unclamped area of the main cladding area 410 relative to the connection area 420.

[0233] After the unclamped area of the main cladding area 410 bends relative to the connection area 420, it can form a cladding on the main surface 211. After the unclamped area of the main cladding area 410 clads the main surface 211, the film clamps 332 can release the clamping of the cladding film 400, and the area of the cladding film 400 clamped by the film clamps 332 also needs to be clad on the electrode body 210. By setting the movement trend of the area of the cladding film 400 clamped by the film clamps 332 relative to the connection area 420 to be consistent with the bending trend of the unclamped area of the main cladding area 410 relative to the connection area 420, the area of the cladding film 400 clamped by the film clamps 332 can be made closer to the electrode body 210, facilitating the cladding of the area of the cladding film 400 clamped by the film clamps 332 on the electrode body 210.

[0234] In addition, after the film clamps 332 release the clamping of the cladding film 400, by setting the movement trend of the area of the cladding film 400 clamped by the film clamps 332 relative to the connection area 420 to be consistent with the bending trend of the unclamped area of the main cladding area 410 relative to the connection area 420, the adverse effect of the area of the cladding film 400 clamped by the film clamps 332 on the cladding of the unclamped area of the main cladding area 410 on the main surface 211 can be reduced, and the risk of the unclamped area of the main cladding area 410 falling off from the main surface 211 can be lowered.

[0235] Optionally, as Figure 5 and Figure 9 shown, the second film driving mechanism 334 includes a fourth film support 339 and a second film driving motor 340. The film clamp 332 is arranged on the fourth film support 339, and the second film driving 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.

[0236] According to some embodiments of the present application, optionally, as Figure 5 and Figure 9As shown, the first film driving mechanism 333 includes a first film driving motor 337, a first film support 3371, and a second film support 342. The first film driving 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 driving mechanism 334 includes a second film driving motor 340. The second film driving 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 so that the film clamping jaws 338 clamp and fix the coating film 400.

[0237] With such an arrangement, the degree of freedom of movement of the coating film 400 can be increased, and the coating effect can be improved.

[0238] According to some embodiments of the present application, optionally, as Figure 5 and Figure 9 shown, each first sub-coating assembly 331 further includes a third film driving mechanism 335. The two third film driving 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. When the film clamp 332 moves along the second direction D2 toward the side where the electrode body 210 is located, the electrode assembly 200 can remain fixed or move along the second direction D2 toward the coating film 400.

[0239] With such an arrangement, by driving the film clamp 332 to move along the second direction D2 toward 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 region 420, and the main coating region 410 can be driven to move along the second direction D2 toward the side where the electrode body 210 is located, so that the projections of the two main coating regions 410 on the corresponding main surface 211 along the first direction D1 can gradually cover the exposed portion of the main surface 211, which facilitates the coating of the main surface 211 by the main coating region 410.

[0240] Optionally, as Figures 5 to 7 and Figure 9As 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. The third film driving mechanism 335 is configured to drive the corresponding film fixture 332 to move along the second direction D2 along the second direction D2. Further, after the first one 212a of the two end faces 212 contacts the connection area 420, 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 along the second direction D2.

[0241] 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 towards the side away from the electrode body 210 along the second direction D2 is smaller than the displacement stroke of the electrode assembly 200 moving towards the side where the coating film 400 is located along the second direction D2, 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 contact the connection area 420, and can drive the main coating area 410 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 surface 211 along the first direction D1 can gradually cover the exposed part of the main surface 211, so that it is convenient to carry out the coating of the main coating area 410 on the main surface 211.

[0242] Optionally, as Figure 5 and Figure 9 shown, the third film driving mechanism 335 is provided with a third film driving motor 341, and the third film driving motor 341 is used to drive the film fixture 332 to move along the second direction D2. Specifically, the third film driving mechanism 335 further includes a lead screw and a slider. The third film driving motor 341 can drive the lead screw to rotate, and the slider is sleeved on the lead screw and is screwed with the lead screw through a thread. The slider is fixedly arranged relative to the film fixture 332, and the rotation axis of the lead screw is arranged parallel to the second direction D2. When the third film driving motor 341 drives the lead screw to rotate, it can drive the slider to move along the rotation axis direction of the lead screw, so as to drive the film fixture 332 to move along the second direction D2.

[0243] Optionally, as Figure 5 and Figure 9As shown, the first sub-covering 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. The third film transmission mechanism 335 can drive the third film support 343 to move along the second direction D2, so as to drive 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. 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, so as to drive 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.

[0244] According to some embodiments of the present application, optionally, as Figure 5 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 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 arranged 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 arranged 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 so that the film clamping jaws 338 clamp and fix the covering film 400.

[0245] With such an arrangement, the movement freedom of the covering film 400 can be further improved, and the covering effect can be improved.

[0246] According to some embodiments of the present application, optionally, as Figures 10 to 12 shown, before the first contact connection area 420 of the two end faces 212, the first covering assembly 330 is configured such that the connection area 420 and the first of the two main covering areas 410 are bent with respect to each other.

[0247] The connection region 420 and the first of the two main covering regions 410 are bent with respect to each other, which is conducive to the compact structure of the first covering assembly 330 and reduces the occupied space of the first covering assembly 330. Specifically, if the connection region 420 and the first of the two main covering regions 410 are coplanar, the maximum distance between the edge of the connection region 420 and the edge of the first of the two main covering regions 410 will be greater. When the first covering assembly 330 positions the covering film 400, the positioning effect needs to reach the edge of the connection region 420 and the edge of the first of the two main covering regions 410, and there is a greater distance between the acting positions of the first covering assembly 330 on the covering film 400, resulting in a larger occupied space for the first covering assembly 330.

[0248] The first covering assembly 330 can position the bent connection region 420 and the first of the two main covering regions 410 with respect to each other, so that the connection region 420 and the first of the two main covering regions 410 remain in a bent state with respect to each other. In some embodiments, the first covering assembly 330 is arranged to control the relative movement of the coplanar connection region 420 and the first of the two main covering regions 410, so that the two are bent with respect to each other.

[0249] According to some embodiments of the present application, optionally, as Figures 10 to 12 shown, before the first of the two end faces 212, i.e., 212a, contacts the connection region 420, the first covering assembly 330 is arranged such that the connection region 420 and the second of the two main covering regions 410 are coplanar with each other.

[0250] By setting the connection region 420 and the second of the two main covering regions 410 to be coplanar with each other, the second of the two main covering regions 410 does not block the connection region 420, which can reduce the interference of the second of the two main covering regions 410 on the process of the pole ear portion 201 passing through the opening 421, and reduce the interference of the second of the two main covering regions 410 on the process of the connection region 420 contacting and covering the first of the two end faces 212, i.e., 212a.

[0251] For example, the first covering assembly 330 pulls the covering film 400 to partially stretch the covering film 400, so that the connection region 420 and the two main covering regions 410 are coplanar with each other.

[0252] According to some embodiments of the present application, optionally, as Figures 10 to 12 shown, the first covering assembly 330 includes a first sub-covering assembly 331 and a second sub-covering assembly 344. The first sub-covering assembly 331 clamps and fixes the end of the covering film 400 away from the first of the two main covering regions 410, and the second sub-covering assembly 344 is used to support and position the first of the two main covering regions 410.

[0253] Based on the positioning of the first of the two main covering areas 410 by the second sub-covering assembly 344, the first sub-covering assembly 331 can position the covering film 400 by clamping and fixing the end of the covering film 400 away from the first of the two main covering areas 410. Therefore, the second sub-covering assembly 344 and the first sub-covering assembly 331 can position the connection area 420 without directly contacting the connection area 420, thereby reducing the interference during the process of the pole ear part 201 passing through the opening 421 and reducing the interference during the process of contacting and covering the connection area 420 on the first of the two end faces 212, i.e., 212a.

[0254] Specifically, the connection area 420 is connected between the two main covering areas 410. Therefore, the position of the first of the two main covering areas 410 can limit the positions of the second of the two main covering areas 410 and the connection area 420. The second of the two main covering areas 410 and the connection area 420 are integrally connected. Under the action of the first sub-covering assembly 331 and the first of the two main covering areas 410, they are stretched, and the second of the two main covering areas 410 and the connection area 420 can be positioned by the second sub-covering assembly 344 and the first sub-covering assembly 331.

[0255] For example, the second sub-covering assembly 344 is arranged below the first of the two main covering areas 410 to support the first of the two main covering areas 410. At the same time, the second sub-covering assembly 344 can position the first of the two main covering areas 410 by means of negative pressure suction.

[0256] According to some embodiments of the present application, optionally, as Figures 10 to 12 shown, the first positioning assembly 310 is arranged to move along the second direction D2 so that the first of the two end faces 212, i.e., 212a, contacts the connection area 420. The first positioning assembly 310 is further arranged to move along the first direction D1 so that the first of the two main faces 211 contacts the first of the two main covering areas 410. The first sub-covering assembly 331 is arranged to move along the first direction D1 and the second direction D2 so that the second of the two main covering areas 410 contacts the second of the two main faces 211. Specifically, the first positioning assembly 310 can drive the electrode assembly 200 along the second direction D2 so that the first of the two end faces 212, i.e., 212a, contacts the connection area 420. The first positioning assembly 310 can drive the electrode assembly 200 along the first direction D1 so that the first of the two main faces 211 contacts the first of the two main covering areas 410. The first sub-covering assembly 331 can drive the ends of the second of the two main covering areas 410 along the first direction D1 and the second direction D2 so that the second of the two main covering areas 410 contacts the second of the two main faces 211.

[0257] The first positioning component 310 can be configured to first drive the electrode component 200 along the second direction D2, so that the first one 212a of the two end faces 212 contacts the connection area 420, and then the first positioning component 310 is further configured to drive the electrode component 200 along the first direction D1, so that the first one of the two main faces 211 contacts the first one of the two main coating areas 410. Alternatively, the first positioning component 310 can be configured to first drive the electrode component 200 along the first direction D1, so that the first one of the two main faces 211 contacts the first one of the two main coating areas 410, and then the first positioning component 310 is further configured to drive the electrode component 200 along the second direction D2, so that the first one 212a of the two end faces 212 contacts the connection area 420. Or, the first positioning component 310 can be configured to drive the electrode component 200 along the first direction D1 while driving the electrode component 200 along the second direction D2.

[0258] After the first one 212a of the two end faces 212 contacts the connection area 420, the first sub-coating component 331 can drive the end of the second one of the two main coating areas 410 along the first direction D1 and the second direction D2, so that the second one of the two main coating areas 410 contacts the second one of the two main faces 211. For example, the first sub-coating component 331 can drive the end of the second one of the two main coating areas 410 along the first direction D1 and the second direction D2 at the same time, so that the end of the second one of the main coating areas 410 moves toward the end of the main face 211 away from the tab 201, thereby driving the second one of the main coating areas 410 to rotate relative to the connection area 420 until the second one of the main coating areas 410 contacts the second one of the two main faces 211.

[0259] With such a setting, the relative position relationship between the electrode component 200 and the coating film 400 can be adjusted. When the coating film 400 coats the two main faces 211 and the first one 212a of the two end faces 212 of the electrode body 210, continuous coating of the two main faces 211 and the first one 212a of the two end faces 212 can be achieved, the stability of the coating process can be improved, and the coating action can be made more concise and smooth.

[0260] Optionally, as Figures 9 to 12As shown, the first sub-encapsulation component 331 may include the above-mentioned film clamp 332, the first film transmission mechanism 333 and the second film transmission mechanism 334. The first sub-encapsulation component 331 may also include a third film transmission mechanism 335. The film clamp 332 clamps and fixes the end of the coating film 400 away from the first of the two main encapsulation areas 410. The first film transmission mechanism 333, the second film transmission mechanism 334 and the third film transmission mechanism 335 can drive the end of the second of the two main encapsulation areas 410 along the first direction D1 and the second direction D2 by driving the film clamp 332 to move, so that the second of the two main encapsulation areas 410 contacts the second of the two main surfaces 211.

[0261] Alternatively, if Figure 9 and Figure 11 As 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 also includes a screw and a slider, and the third film transmission motor 341 can drive the screw to rotate, and the slider is sleeved on the screw and screwed with the screw through a thread. The slider and the film clamp 332 are relatively fixedly arranged, and the rotation axis of the screw is set to be parallel to the second direction D2. When the third film transmission motor 341 drives the screw to rotate, it can drive the slider to move along the rotation axis direction of the screw, thereby driving the film clamp 332 to move along the second direction D2.

[0262] Alternatively, if Figure 9 and Figure 11 As shown, the first sub-coating component 331 is provided with a second membrane support 342 and a third membrane support 343, the second membrane support 342 is extended along the second direction D2, and the third membrane support 343 is slidably provided on the second membrane support 342 along the second direction D2. The second membrane transmission mechanism 334 and the membrane clamp 332 are provided on the third membrane support 343. The third membrane transmission mechanism 335 is transmission-connected with the third membrane support 343, and the third membrane transmission mechanism 335 can drive the third membrane support 343 to move along the second direction D2, thereby driving the second membrane transmission mechanism 334 and the membrane clamp 332 to move along the second direction D2 through the third membrane support 343. The third film transmission mechanism 335 is arranged on the second film support 342, and the first film transmission mechanism 333 is connected to 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.

[0263] According to some embodiments of the present application, optionally, Figures 13 to 15As shown, 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 assembly 370, and the second coating assembly 370 is arranged to drive the side coating area 430 to contact and coat on the side surface 213.

[0264] The second coating assembly 370 can adjust the relative positional relationship between the electrode assembly 200 and the side coating area 430. By arranging the second coating assembly 370 to coat the side coating area 430 on the side surface 213, the coating effect of the coating film 400 on the electrode body 210 can be improved.

[0265] According to some embodiments of the present application, optionally, as Figures 13 to 15 shown, the second coating assembly 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 used 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 used 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.

[0266] After the main coating area 410 is coated on the main surface 211 of the electrode body 210, the side coating area 430 and the main coating area 410 can be coplanar or approximately coplanar. The side pressing plate 371 moving along the first direction D1 can push the side coating area 430 to bend relative to the main coating area 410, and the side coating area 430 gradually approaches the side surface 213 of the electrode body 210 during the bending process relative to the main coating area 410. After 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 side pressing plate 371 and the side surface 213 of the electrode body 210 can be opposite and spaced apart in the third direction D3, and the side coating area 430 is located between the side pressing plate 371 and the side surface 213 of the electrode body 210. At this time, the side pressing plate 371 moving close to the electrode body 210 along the third direction D3 can press the side coating area 430 on the side surface 213 of the electrode body 210, so that the side coating area 430 forms a coating on the side surface 213 of the electrode body 210.

[0267] With such an arrangement, the actions of bending the side coating area 430 by the second coating assembly 370 and coating the side coating area 430 on the side surface 213 can be smoothly connected, which is beneficial to simplifying the actions and structure of the second coating assembly 370 and improving the coating efficiency.

[0268] Optionally, as Figures 13 to 15As shown, each main covering area 410 may 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 may be denoted as B1 and B2, and the two side covering areas 430 connected to the second of the two main covering areas 410 may be denoted as B3 and B4. The second covering assembly 370 includes four side pressing plates 371 corresponding to the four side covering areas 430 one by one. The four side pressing plates 371 may be denoted as C1, C2, C3, and C4. C1, C2, C3, and C4 are used to bend B1, B2, B3, and B4 towards the side surface 213 one by one and press them against the side surface 213 of the electrode body 210.

[0269] 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 directions in which C1 and C2 move along the first direction D1 are opposite to the directions in which C3 and C4 move 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.

[0270] Before C1 and C2 move along the third direction D3 respectively, C1 and C2 are spaced apart and oppositely arranged relative to the two side surfaces 213. B1 is between C1 and one side surface 213, and B2 is between C2 and the other side surface 213. The directions in which C1 moves towards the electrode body 210 along the third direction D3 and C2 moves towards 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 against 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 and oppositely arranged relative to the two side surfaces 213. B3 is between C3 and one side surface 213, and B4 is between C4 and the other side surface 213. The directions in which C3 moves towards the electrode body 210 along the third direction D3 and C4 moves towards 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 against the side surface 213 of the electrode body 210 respectively.

[0271] 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. 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.

[0272] According to some embodiments of the present application, optionally, as Figures 13 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 one 212b of the two end surfaces 212.

[0273] The second covering assembly 370 can adjust the relative position relationship between the electrode assembly 200 and the end covering area 440. By arranging the second covering assembly 370 to cover the end covering area 440 on the second one 212b of the two end surfaces 212, the covering effect of the covering film 400 on the electrode body 210 can be improved.

[0274] According to some embodiments of the present application, optionally, as Figures 13 to 15 shown, the second covering assembly 370 includes an end surface 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 used to drive the end surface pressing plate 374 along the first direction D1, so that the end surface 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 surfaces 212. The third pressing plate driving mechanism 375 is used to drive the end surface pressing plate 374 along the second direction D2, so that the end surface pressing plate 374 presses the end covering area 440 on the second one 212b of the two end surfaces 212.

[0275] After the main covering area 410 covers 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 end face pressing plate 374 moving along the first direction D1 can push the end covering area 440 to bend relative to the main covering area 410. During the process of the end covering area 440 bending 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 oppositely 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 end face pressing plate 374 moving close to the electrode body 210 along the second direction D2 can press the end covering area 440 against the second one 212b of the two end faces 212, so that the end covering area 440 forms a covering for the second one 212b of the two end faces 212.

[0276] Optionally, as Figures 13 to 15 shown, each main covering area 410 is connected to an end covering area 440, and the second covering assembly 370 includes two end face pressing plates 374. The two end face pressing plates 374 moving along 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 along 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.

[0277] In some embodiments, the two end covering areas 440 can overlap each other and partially overlap. One of the two end face pressing plates 374 can first bend an end covering area 440 towards the second one 212b of the two end faces 212 and press it against the second one 212b of the two end faces 212, and the other of the two end face pressing plates 374 can then bend the other end covering area 440 towards the second one 212b of the two end faces 212 and press it against the second one 212b of the two end faces 212.

[0278] In some embodiments, the second platen transmission mechanism 373 includes a first platen cylinder 376, and the third platen transmission mechanism 375 includes a second platen cylinder 3761. The second platen cylinder 3761 is configured to provide power for driving the end platen 374 in the second direction D2, and the first platen cylinder 376 is configured to provide power for driving the side platen 371 in the third direction D3. In other embodiments, the second platen transmission mechanism 373 and the third platen transmission mechanism 375 can be linked. For example, the second platen transmission mechanism 373 and the third platen transmission mechanism 375 share a cylinder to simultaneously provide power for driving the end platen 374 in the second direction D2 and the side platen 371 in the third direction D3, such that while the side platen 371 moves towards the side covering area 430 in the third direction D3, the end platen 374 moves towards the end covering area 440 in the second direction D2. Thus, the covering time can be reduced and the covering efficiency can be improved.

[0279] Optionally, there is no relative displacement between the end platen 374 and the side platen 371 in the first direction D1. The first platen transmission mechanism 372 can drive the end platen 374 and the side platen 371 in the first direction D1 simultaneously. Thus, the covering efficiency can be improved. Further, when the first platen transmission mechanism 372 drives the end platen 374 in the first direction D1, it can synchronously drive the third platen transmission mechanism 375 in the first direction D1, and when the first platen transmission mechanism 372 drives the side platen 371 in the first direction D1, it can synchronously drive the second platen transmission mechanism 373 in the first direction D1.

[0280] Optionally, as Figures 13 to 15 shown, the first platen transmission mechanism 372 is provided with a platen drive motor 377, and the platen drive motor 377 is configured to provide power for driving the end platen 374 and the side platen 371 in the first direction D1. Further, the platen drive motor 377 is configured to drive the second platen transmission mechanism 373, the third platen transmission mechanism 375, the end platen 374, and the side platen 371 in the first direction D1.

[0281] Optionally, as Figures 13 to 15 shown, the second covering assembly 370 includes a first platen bracket 378 and a second platen bracket 379. The second platen bracket 379 is slidably disposed on the first platen bracket 378 in the first direction D1. The first platen transmission mechanism 372 is disposed on the first platen bracket 378 and is in transmission connection with the second platen bracket 379 to drive the second platen bracket 379 to move relative to the first platen bracket 378 in the first direction D1. The side platen 371, the second platen transmission mechanism 373, the end platen 374, and the third platen transmission mechanism 375 can be disposed on the second platen bracket 379 and move synchronously with the second platen bracket 379 in the first direction D1.

[0282] Further, the first pressing plate bracket 378 and the second pressing plate bracket 379 are relatively fixedly arranged.

[0283] Optionally, as Figures 13 to 15 shown, an end position limiting block 3741 with an adjustable position is arranged on the end face pressing plate 374. The end position limiting block 3741 is used to abut against the main wrapping area 410 to limit the electrode assembly 200 in the first direction D1. By adjusting the position of the end position 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 wrapping area 410 is arranged on the end position limiting block 3741, so as to improve the fitting degree with the main wrapping area 410.

[0284] Optionally, as Figures 13 to 15 shown, a side position limiting block 3711 with an adjustable position is arranged on the side face pressing plate 371. The side position limiting block 3711 is used to abut against the main wrapping area 410 to limit the electrode assembly 200 in the first direction D1. By adjusting the position of the side position limiting block 3711 on the side face pressing plate 371, electrode assemblies 200 of different sizes can be matched, thereby improving the compatibility of the side face pressing plate 371 with electrode assemblies 200 of different sizes. Further, an arc surface facing the main wrapping area 410 is arranged on the side position limiting block 3711, so as to improve the fitting degree with the main wrapping area 410.

[0285] According to some embodiments of the present application, optionally, as Figures 13 to 15 shown, the first pressing plate transmission mechanism 372 includes a pressing plate transmission motor 377, a first pressing plate bracket 378, and a second pressing plate bracket 379. The pressing plate transmission 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 pressing plate transmission mechanism 373 includes a first pressing plate cylinder 376. The first pressing plate cylinder 376 is arranged on the second pressing plate bracket 379, and the first pressing plate cylinder 376 drives the side face pressing plate 371 to move relative to the second pressing plate bracket 379. The third pressing plate transmission mechanism 375 includes a second pressing plate cylinder 3761. The second pressing plate cylinder 3761 is arranged on the second pressing plate bracket 379, and the second pressing plate cylinder 3761 drives the end face pressing plate 374 to move relative to the second pressing plate bracket 379.

[0286] With such an arrangement, the degrees of freedom of movement of the side face pressing plate 371 and the end face pressing plate 374 can be improved, which is beneficial to improving the wrapping effect.

[0287] According to some embodiments of the present application, optionally, as Figure 6 、 Figure 7 、 Figure 16 and Figure 17As shown, the coating film 400 further includes a side coating area 430 and an end coating area 440 connected to the main coating area 410. The side coating area 430 is coated on the side surface 213, and the end coating area 440 is coated on the second one 212b of the two end surfaces 212. The coating device 300 further includes a first tape attaching assembly 380 for attaching 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 coating area 430 and the second part 512 of the first tape 510 to the end coating area 440 at the corner formed by the side surface 213 and the second one 212b of the two end surfaces 212.

[0288] 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 coating area 430 and the end coating area 440 together, so that the side coating area 430 and the end coating area 440 can be fixed relative to the electrode body 210, thereby improving the firmness of the coating of the coating film 400 on the electrode body 210.

[0289] Specifically, after pressing the end coating area 440 and the side coating area 430 against the battery body, the first tape attaching assembly 380 can drive the electrode assembly 200 to move, so that the side coating area 430 and the first part 511 of the first tape 510 are relatively arranged. 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 is attached to the side coating 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 attaches to the end coating area 440.

[0290] Alternatively, the first tape attaching assembly 380 can drive the electrode assembly 200 to move, so that the end coating area 440 and the second part 512 of the first tape 510 are relatively arranged. 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 is attached to the end coating 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 attaches to the side coating area 430.

[0291] 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 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.

[0292] 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 release portion of the first tape roll 384, the first cutting mechanism 383 is used to cut the first tape 510 from the release portion of the first tape roll 384, and the first glue taking mechanism 386 is used to suck and attach the first tape 510 onto the covering film 400.

[0293] Optionally, as Figures 18 to 23 shown, the first tape attaching assembly 380 further includes a first tape feeding mechanism 387, and the first tape feeding mechanism 387 is used to convey the release portion 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 release portion of the first tape roll 384.

[0294] 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 glue pulling mechanism 382 and a first cutting mechanism 383. The first unwinding mechanism 381 is configured to place and release the first tape roll 384, the first glue pulling mechanism 382 is configured to clamp and pull the leading end of the release portion of the first tape roll 384, and the first cutting mechanism 383 is configured to cut out the first tape 510 from the release portion of the first tape roll 384.

[0295] With such a setting, it is beneficial to realize the automatic supply of the first tape 510.

[0296] According to some embodiments of the present application, optionally, as Figures 18 to 23 shown, the first glue pulling mechanism 382 includes a first glue clamping cylinder 3821, a first glue pulling motor 3822 and a first glue clamping member 3823. The first glue clamping cylinder 3821 is used to drive the first glue clamping member 3823 to clamp the leading end of the release portion, and the first glue pulling motor 3822 is used to drive the first glue clamping member 3823 to move to pull the release portion.

[0297] The first glue pulling motor 3822 can extend the release part of the first tape roll 384 by driving the first glue clamping part 3823 to move to pull the release part, and the release part of the first tape roll 384 is stretched to facilitate cutting.

[0298] 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 groups. The first tape attaching assembly 380 includes a switching mechanism 385, and the switching mechanism 385 includes a reel support 3851 and a switching motor 3852. The two groups of first unwinding mechanisms 381 and first cutting mechanisms 383 are arranged on the reel support 3851. The switching motor 3852 drives the reel support 3851 to rotate around a predetermined rotation axis, so that the two groups of first unwinding mechanisms 381 and first cutting mechanisms 383 can be switched between a standby position and a working position for the first glue pulling mechanism 382 and the first cutting mechanism 383 to operate. The rotation axis is perpendicular to the plane where the release part is located.

[0299] One first unwinding mechanism 381 and one first cutting mechanism 383 can form a group. Two first unwinding mechanisms 381 and two first cutting mechanisms 383 can correspondingly form two groups. With such a setting, 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°.

[0300] According to some embodiments of the present application, optionally, as Figures 18 to 23 shown, the first tape attaching assembly 380 includes a first glue taking mechanism 386, and the first glue taking mechanism 386 is used to adsorb and take away 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 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 tape 510 from the release part.

[0301] Setting the first pressing block 3831 can press and position the release part of the first tape roll 384, which can improve the stability of the cutting process.

[0302] 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 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, and a second tape picking support 3865. The first tape picking member 3861 is used for adsorbing the 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 laterally to 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 first tape picking member 3861 to approach and move away from the plane where the release portion of the first tape roll 384 is located.

[0303] With such an arrangement, 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.

[0304] According to some embodiments of the present application, optionally, as Figures 18 to 23 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.

[0305] With such an arrangement, the coherence of the tape picking action and the tape attaching action can be improved.

[0306] Optionally, at least one of the first sub-tape picking portion 3866 and the second sub-tape picking portion 3867 has an adsorption surface for contacting and adsorbing the first tape 510, and the first sub-tape picking portion 3866 and the second sub-tape picking portion 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 portion 3866 and the second sub-tape picking portion 3867 can be driven to move in a direction perpendicular to the adsorption surface.

[0307] According to some embodiments of the present application, optionally, as Figures 18 to 23As 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 and holds 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 and holds 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.

[0308] The telescopic member can be telescoped. For example, the telescopic member is an elastic member that is telescoped under pressure.

[0309] 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 attaching 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 to cause misalignment 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 the end covering area 440 and the side covering area 430 at the same time.

[0310] 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 bracket 3864, a second tape picking bracket 3865, a third tape picking bracket 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 bracket 3864 and drives the second tape picking bracket 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 bracket 3865 and drives the third tape picking bracket 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 bracket 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 along the third direction D3 of the electrode assembly 200.

[0311] 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.

[0312] 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 correspondingly at two corners spaced along the third direction D3 of the electrode assembly 200, improving the tape attaching efficiency.

[0313] 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 520 to the electrode assembly 200. 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.

[0314] 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 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.

[0315] 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.

[0316] Optionally, as Figures 24 to 29 shown, the second tape attaching assembly 390 further includes a second cutting mechanism 393, a second glue taking mechanism 395 and a second tape pulling mechanism 392. The second tape 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 and attach the second tape 520 onto the covering film 400.

[0317] Optionally, as Figures 24 to 29 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.

[0318] According to some embodiments of the present application, optionally, as Figures 24 to 29 shown, 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 configured to attach the two first parts of the second tape 520 to the corresponding one of the two main covering areas 410 respectively.

[0319] With such a setting, 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.

[0320] 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.

[0321] According to some embodiments of the present application, optionally, as Figures 24 to 29 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.

[0322] With such a setting, it is beneficial to automatically provide the second tape 520.

[0323] According to some embodiments of the present application, optionally, as Figures 24 to 29 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.

[0324] 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.

[0325] According to some embodiments of the present application, optionally, as Figures 24 to 29 shown, the second unwinding mechanism 391 and the second cutting mechanism 393 are two corresponding groups and are spaced apart 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 disposed on the tape pulling support 394, and the second tape pulling mechanism 392 is disposed 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 spacing direction D5 between the two second unwinding mechanisms 391, so that the second tape pulling mechanism 392 can be switched between the two groups of the second unwinding mechanism 391 and the second cutting mechanism 393.

[0326] A second unwinding mechanism 391 and a second cutting mechanism 393 can form a group. Two second unwinding mechanisms 391 and two second cutting mechanisms 393 can correspondingly form two groups. By providing two groups of second unwinding mechanisms 391 and second cutting mechanisms 393, the interference of the roll 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 unwinding mechanisms 391 and second cutting mechanisms 393 are arranged in layers in the height direction of the second tape attaching assembly 390.

[0327] By setting 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 unwinding mechanisms 391, the position of the tape pulling mechanism can correspond to the position of a group of second unwinding mechanism 391 and second cutting mechanism 393 that is working, facilitating the tape pulling operation.

[0328] According to some embodiments of the present application, optionally, as Figures 24 to 29 shown, the second tape attaching assembly 390 includes a second tape picking mechanism 395, and the second tape picking mechanism 395 is used 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 configured to drive the second pressing block 3931 to press the released portion 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 portion of the second tape roll 396.

[0329] Setting the second pressing block 3931 can press and position the released portion of the second tape roll 396, improving the stability of the cutting process.

[0330] According to some embodiments of the present application, optionally, as Figures 24 to 29 shown, the second tape attaching assembly 390 includes a second tape picking mechanism 395, and the second tape picking mechanism 395 is used 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 portion, and drives the second tape picking member 3951 to approach and move away from the plane where the released portion 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 arranged opposite to the released portion of the second tape roll 396 along the thickness direction D6 of the released portion of the second tape roll 396.

[0331] With such a setting, the degree of freedom of movement of the second glue-taking member 3951 can be improved, facilitating the sucking and transferring of the second tape 520.

[0332] According to some embodiments of the present application, optionally, as Figures 24 to 29 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 part 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 part 522 of the second tape 520 and attach it to the side covering area 430.

[0333] With such a setting, the coherence of the glue-taking action and the glue-attaching action can be improved.

[0334] 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. 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.

[0335] According to some embodiments of the present application, optionally, as Figures 24 to 29 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 part 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 part 521 of the second tape 520 to the main covering area 410.

[0336] The telescopic member can be telescoped. For example, the telescopic member is an elastic member.

[0337] 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 diverse 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 adhere to the main wrapping area 410 and the side wrapping area 430 simultaneously. Further, the fourth sub-glue-taking portion 3955 is located between 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 adhere to two main wrapping areas 410 and the side wrapping area 430 simultaneously.

[0338] According to some embodiments of the present application, optionally, as Figures 24 to 29 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 of the second tape roll 396. 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 arranged 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 the two sets of second unwinding mechanisms 391 and the second cutting mechanism 393.

[0339] 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 adhering assembly 390.

[0340] By arranging the glue-taking position-changing cylinder 3956 to drive the glue-taking position-changing bracket 3957 to move along the interval 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.

[0341] According to some embodiments of the present application, optionally, as Figure 30As shown, the wrapping device 300 includes a flipping assembly 360. The flipping 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 wrapping 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 wrapping area 430 and the side surface 213.

[0342] 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 wrapping film 400. The main pressing member 362 is configured to avoid the pasting position of the second tape 520 when pressing the main wrapping area 410 and the main surface 211, and the side pressing member 364 is configured to avoid the pasting position of the second tape 520 when pressing the side wrapping area 430 and the side surface 213. With such a setting, the stability of the gluing process can be improved.

[0343] According to some embodiments of the present application, optionally, as Figure 30 shown, the flipping 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 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.

[0344] With such a setting, the degree of freedom of movement of the electrode assembly 200 can be improved, facilitating the pasting of 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 by ° so as to be able to attach the second tape 520 to the opposite sides of the electrode assembly 200 respectively.

[0345] According to some embodiments of the present application, optionally, as Figure 24 and Figure 30 shown, the second tape attaching assembly 390 includes two second unwinding mechanisms 391. The flipping 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 arranged 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.

[0346] 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 reel change 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.

[0347] By setting 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 be made to correspond to the positions of a group of the working second unwinding mechanisms 391 and the second cutting mechanism 393, facilitating the gluing operation.

[0348] 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 tab 221, a separator 222, and a negative electrode tab 223 stacked.

[0349] With such a setting, it is beneficial to improve the space utilization rate of the electrode assembly 200 and the energy storage density of the electrode assembly 200.

[0350] Furthermore, the two electrode modules 220 can be connected in series or in parallel through the pole ears 201.

[0351] Optionally, the two electrode modules 220 can be fixed together by a fixing member 230 to facilitate improving the stability of the coating process. For example, the fixing member 230 is a tape.

[0352] According to some embodiments of the present application, optionally, as Figure 16 shown, the coating device 300 further includes a turntable 350, the turntable 350 is set to rotate around a predetermined rotation axis, the number of the first coating assemblies 330 is at least two, and they are arranged at intervals around the rotation axis on the turntable 350, and the turntable 350 drives at least two first coating assemblies 330 to sequentially pass through the first positioning assembly 310.

[0353] Specifically, the turntable 350 is rotatable relative to the first positioning assembly 310, and the first covering assembly 330 is disposed on the turntable 350 and is rotatable with the turntable 350. The first covering assembly 330 can drive the covering film 400 to rotate with the turntable 350, and the first positioning assembly 310 can position the electrode assembly 200. When the first covering assembly 330 passes through the first positioning assembly 310, the first covering assembly 330 can drive the covering film 400 to move relative to the electrode assembly 200, so that the tab 201 passes through the opening 421, and the connection area 420 contacts and covers the first one 212a of the two end faces 212. As the turntable 350 rotates one week, at least two first covering assemblies 330 can sequentially pass through the first positioning assembly 310, so that at least two electrode assemblies 200 and at least two covering films 400 respectively perform the following actions in one-to-one correspondence at the first positioning assembly 310: the tab 201 passes through the opening 421, and the connection area 420 contacts and covers the first one 212a of the two end faces 212. As the turntable 350 rotates multiple weeks, each first covering assembly 330 can pass through the first positioning assembly 310 multiple times, so as to drive different electrode assemblies 200 and different covering films 400 to perform the following actions in one-to-one correspondence: the tab 201 passes through the opening 421, and the connection area 420 contacts and covers the first one 212a of the two end faces 212.

[0354] It is convenient to arrange circuits and gas paths on the turntable 350. By setting the turntable 350 to drive at least two first covering assemblies 330 to sequentially pass through the first positioning assembly 310, it is convenient to control the movement of the first covering assembly 330, and at the same time, it is convenient to realize the positioning of the first covering assembly 330 for the covering film 400.

[0355] Optionally, the dimension of the electrode assembly 200 along the first direction D1 is smaller than the dimension of the electrode assembly 200 along the second direction D2 and the dimension of the electrode assembly 200 along the third direction D3. The rotation axis direction of the turntable 350 can be parallel to the first direction D1. With such a setting, it is beneficial to reduce the dimension of the covering device 300 in the first direction D1. When the first covering assembly 330 passes through the first positioning assembly 310, for the electrode assembly 200, compared with the first one 212a of the two end faces 212, the second one 212b of the two end faces 212 is closer to the rotation axis of the turntable 350. For the covering film 400, one end of the first one of the two main covering areas 410 is connected to the connection area 420, and one end of the first one of the two main covering areas 410 extends toward the rotation axis of the turntable 350. With such a setting, it is convenient to pass the tab 201 through the opening 421 and cover the connection area 420 on the first one 212a of the two end faces 212. Further, the rotation axis of the turntable 350 is perpendicular to the ground when arranged.

[0356] Optionally, after the first of the two main surfaces 211 comes into contact with the first of the two main covering areas 410, the second sub-covering assembly 344 can be used to support the electrode assembly 200 and drive the electrode assembly 200 to rotate with the turntable 350, so as to mount the electrode assembly 200 onto the turntable 350.

[0357] Optionally, as Figure 10 , Figure 11 and Figure 16 shown, the covering device 300 further includes a covering film loading mechanism 301, and the covering film loading mechanism 301 can drive the covering film 400 close to the turntable 350. For example, the covering device 300 further includes a sliding track 351, and the covering film loading mechanism 301 can suck the covering film 400 and slide along the sliding track 351 close to the turntable 350. When the first covering assembly 330 rotates with the turntable 350, it can pass by the covering film loading mechanism 301. At this time, the first covering assembly 330 can position the covering film 400 and drive the covering film 400 to rotate with the turntable 350, so as to mount the covering film 400 onto the turntable 350. Then, the covering film 400 can rotate with the turntable 350 and approach the first positioning assembly 310 and the electrode assembly 200 positioned by the first positioning assembly 310, and the following actions occur: the pole ear part 201 passes through the opening 421, and the connecting area 420 contacts and covers the first of the two end faces 212, i.e., 212a, and the two main covering areas 410 respectively cover the two main surfaces 211.

[0358] Optionally, as Figure 10 and Figure 16 shown, the covering device 300 further includes an electrode assembly picking mechanism 353 and an electrode assembly shaping mechanism 354. The electrode assembly picking mechanism 353 can pick up the incoming electrode assembly 200 and clamp it at the electrode assembly shaping mechanism 354, and the electrode assembly shaping mechanism 354 can shape the electrode assembly 200 so that the shape of the electrode assembly 200 meets the specifications. The first positioning assembly 310 can drive the shaped electrode assembly 200 onto the turntable 350. For example, the covering device 300 further includes a sliding track 351. The electrode assembly picking mechanism 353 can clamp the electrode assembly 200 and slide along the sliding track 351 to the electrode assembly shaping mechanism 354, and the first positioning assembly 310 can clamp the shaped electrode assembly 200 and slide along the sliding track 351 towards the turntable 350.

[0359] Optionally, the coating device 300 further includes an electrode assembly blanking mechanism 302. After the tab portion 201 passes through the opening 421 and the connection region 420 contacts and coats the first one 212a of the two end faces 212, and the two main coating regions 410 coat the two main faces 211 respectively, the electrode assembly 200 and the coating film 400 can be driven by the turntable 350 to pass through the second coating assembly 370 and the first tape attaching assembly 380 to coat the two side faces 213 and the second one 212b of the two end faces 212 with the coating film 400 and attach the first tape 510. Then, the electrode assembly 200 and the coating film 400 can be driven by the turntable 350 to pass through the second tape attaching assembly 390 and the electrode assembly blanking mechanism 302 to attach the second tape 520 and blank the electrode assembly 200 coated with the coating film 400. For example, the coating device 300 further includes a sliding track 351, and the electrode assembly blanking mechanism 302 includes a manipulator for clamping the electrode assembly 200 coated with the coating film 400. The manipulator can slide along the sliding track 351 towards the next process to drive the electrode assembly 200 coated with the coating film 400 to the next process.

[0360] Optionally, when one of the at least two first coating assemblies 330 passes through the first positioning assembly 310 and the electrode assembly 200 is loaded onto the turntable 350, the other of the at least two first coating assemblies 330 can pass through the coating film loading mechanism 301 and the coating film 400 is loaded onto the turntable 350. Further, while the electrode assembly 200 and the coating film 400 are respectively loaded onto the turntable 350, another electrode assembly 200 and another coating film 400 can be driven by the turntable 350 to pass through the second coating assembly 370 and the first tape attaching assembly 380 to coat the two side faces 213 and the second one 212b of the two end faces 212 with the coating film 400 and attach the first tape 510. At the same time, another electrode assembly 200 and another coating film 400 can be driven by the turntable 350 to pass through the second tape attaching assembly 390 and the electrode assembly blanking mechanism 302 to attach the second tape 520 and blank the electrode assembly 200 coated with the coating film 400.

[0361] Optionally, the coating device 300 further includes a defective product blanking mechanism 355, and the defective product blanking mechanism 355 can take the electrode assembly 200 and the coating film 400 with unqualified coating away from the turntable 350. For example, the defective product blanking mechanism 355 includes a manipulator and a conveyor belt. The manipulator is used to clamp the electrode assembly 200 and the coating film 400 with unqualified coating, and the conveyor belt is used to drive the electrode assembly 200 and the coating film 400 with unqualified coating away from the turntable 350.

[0362] According to some embodiments of the present application, optionally, as Figures 4 to 31As shown, the electrode assembly 200 includes an electrode body 210 and an electrode tab 201. 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 electrode tab 201 protrudes from the first one 212a of the two end surfaces 212. The coating device 300 includes a first positioning assembly 310 and a first coating assembly 330. The first coating assembly 330 is configured to position the coating film 400, where 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, and an opening 421 is provided in the connection region 420. The first positioning assembly 310 is configured to position the electrode assembly 200 and orient the electrode tab 201 toward the connection region 420. 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 electrode tab 201 passes through the opening 421, and the connection region 420 contacts and coats the first one 212a of the two end surfaces 212. 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. 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 first one 212a of the two end surfaces 212 and the connection region 420 to continue to move synchronously along the second direction D2, and the first coating assembly 330 is configured to drive the ends of the two main coating regions 410 to approach each other along the first direction D1, thereby causing the two main coating regions 410 to contact and coat the exposed portions of the corresponding one of the two main surfaces 211. The first positioning assembly 310 includes an electrode fixture 311, and the electrode fixture 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. The first positioning assembly 310 includes an electrode driving mechanism 312, and the electrode driving mechanism 312 is configured to drive the electrode assembly 200 to move along the second direction D2 toward the side where the coating film 400 is located, and after the first one 212a of the two end surfaces 212 contacts the connection region 420, drive the first one 212a of the two end surfaces 212 and the connection region 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 electrode clamping jaws 3131 and an electrode clamping cylinder 313. The electrode clamping cylinder 313 is configured to drive the electrode clamping jaws 3131 to clamp and fix the electrode body 210. The first covering assembly 330 includes two first sub-covering assemblies 331 arranged at intervals from each other. Each first sub-covering assembly 331 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 covering 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 covering area 410 not clamped by the film fixtures 332 can be bent relative to the connection area 420 towards the corresponding main surface 211. 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 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 second film driving mechanism 334. The two second film driving mechanisms 334 respectively drive the corresponding film fixtures 332 to rotate, so that the movement trend of the area of the covering film 400 clamped by the film fixtures 332 relative to the connection area 420 is consistent with the bending trend of the unclamped area of the main covering area 410 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 second film driving mechanism 334 includes a second film driving motor 340. The second film driving motor 340 is arranged on the second film bracket 342 and drives the film fixture 332 to rotate. The film fixture 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 driving mechanism 335. The two third film driving mechanisms 335 respectively drive the corresponding film fixtures 332 to move towards the side where the electrode body 210 is located along the second direction D2.Alternatively, the first positioning component 310 includes an electrode driving mechanism 312. The electrode driving mechanism 312 is configured to drive the electrode component 200 to move along the second direction D2 towards the side where the covering film 400 is located. After the first one 212a of the two end faces 212 contacts the connection area 420, the electrode driving mechanism 312 drives the first one 212a of the two end faces 212 and the connection area 420 to continue to move synchronously along the second direction D2. After the first one 212a of the two end faces 212 contacts the connection area 420, the third film driving mechanism 335 drives the corresponding film clamp 332 to move along the second direction D2 towards the side away from the electrode body 210 along the second direction D2. The first film driving mechanism 333 includes a first film driving motor 337, a first film support 3371, and a second film support 342. The first film driving motor 337 is disposed on the first film support 3371, and the first film driving 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 third film driving mechanism 335 includes a third film driving motor 341 and a third film support 343. The third film driving 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 driving mechanism 334 includes a second film driving motor 340. The second film driving 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. Before the first one 212a of the two end faces 212 contacts the connection area 420, the first covering component 330 is configured to bend the connection area 420 and the first one of the two main covering areas 410 with respect to each other. Before the first one 212a of the two end faces 212 contacts the connection area 420, the first covering component 330 is configured to make the connection area 420 and the second one of the two main covering areas 410 coplanar with respect to each other. The first covering component 330 includes a first sub-covering component 331 and a second sub-covering component 344. The first sub-covering component 331 clamps and fixes the end of the covering film 400 away from the first one of the two main covering areas 410. The second sub-covering component 344 is used to support and position the first one of the two main covering areas 410. The first positioning component 310 is configured to drive the electrode component 200 along the second direction D2 so that the first one 212a of the two end faces 212 contacts the connection area 420. The first positioning component 310 is further configured to drive the electrode component 200 along the first direction D1 so that the first one of the two main faces 211 contacts the first one of the two main covering areas 410. The first sub-covering component 331 is configured to drive the end of the second one of the two main covering areas 410 along the first direction D1 and the second direction D2 so that the second one of the two main covering areas 410 contacts the second one of the two main faces 211.The covering film 400 includes a side covering area 430 connected to the main covering area 410. The covering device 300 further includes a second covering assembly 370, and the second covering assembly 370 is arranged to drive the side covering area 430 to contact and cover the side surface 213. The second covering assembly 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 used 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 towards the side surface 213. The second pressing plate driving mechanism 373 is used 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. The covering film 400 includes an end covering area 440 connected to the main covering area 410. The second covering assembly 370 is arranged to drive the end covering area 440 to contact and cover the second one 212b of the two end surfaces 212. The second covering assembly 370 includes an end surface 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 used to drive the end surface pressing plate 374 in the first direction D1, so that the end surface 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 surfaces 212. The third pressing plate driving mechanism 375 is used to drive the end surface pressing plate 374 in the second direction D2, so that the end surface pressing plate 374 presses the end covering area 440 against 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 support 378 and a second pressing plate support 379. The pressing plate driving motor 377 is arranged on the first pressing plate support 378 and drives the second pressing plate support 379 to move relative to the first pressing plate support 378. The second pressing plate driving mechanism 373 includes a first pressing plate cylinder 376. The first pressing plate cylinder 376 is arranged on the second pressing plate support 379, and the first pressing plate cylinder 376 drives the side pressing plate 371 to move relative to the second pressing plate support 379. The third pressing plate driving mechanism 375 includes a second pressing plate cylinder 3761. The second pressing plate cylinder 3761 is arranged on the second pressing plate support 379, and the second pressing plate cylinder 3761 drives the end surface pressing plate 374 to move relative to the second pressing plate support 379.The encapsulation film 400 further includes a side encapsulation area 430 and an end encapsulation area 440 connected to the main encapsulation area 410. The side encapsulation area 430 is encapsulated on the side surface 213, and the end encapsulation area 440 is encapsulated on the second one 212b of the two end surfaces 212. The encapsulation device 300 further includes a first tape attachment assembly 380. The first tape attachment assembly 380 is used to drive the electrode assembly 200 and the first tape 510 to move relative to each other. The first tape 510 includes a first part and a second part connected to each other. The first tape attachment assembly 380 is arranged to attach the first part 511 of the first tape 510 to the side encapsulation area 430 and attach the second part 512 of the first tape 510 to the end encapsulation 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 attachment 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 groups. The first tape attachment assembly 380 includes a switching mechanism 385. The switching mechanism 385 includes a reel support 3851 and a switching motor 3852. The two groups of first unwinding mechanisms 381 and first cutting mechanisms 383 are arranged on the reel support 3851. The switching motor 3852 drives the reel support 3851 to rotate around a predetermined rotation axis so that the two groups of first unwinding mechanisms 381 and first cutting mechanisms 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 attachment assembly 380 includes a first tape picking mechanism 386. The first tape picking mechanism 386 is used to adsorb and pick 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 arranged to drive the first pressing block 3831 to press the released part onto the first tape picking mechanism 386 and drive the first cutting knife 3832 to cut out the first tape 510 from the released part. The first tape attachment assembly 380 includes a first tape picking mechanism 386. The first tape picking mechanism 386 is used to adsorb and pick up the first 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 tape 510. The first glue-taking motor 3862 is disposed 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 portion. The second glue-taking motor 3863 is disposed 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 portion is located. The first glue-taking member 3861 includes a first sub-glue-taking portion 3866 and a second sub-glue-taking portion 3867. The first sub-glue-taking 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-glue-taking portion 3867 is used for adsorbing the second part 512 of the first tape 510 and attaching it to the end covering area 440. The first sub-glue-taking portion 3866 is a telescopic member. The second glue-taking motor 3863 drives the first glue-taking member 3861 in the third direction D3. The first sub-glue-taking portion 3866 presses the first part 511 of the first tape 510 against the side covering area 430 and contracts, so that the second sub-glue-taking portion 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-glue-taking portion 3867 is a telescopic member. The second glue-taking motor 3863 drives the first glue-taking member 3861 in the second direction D2. The second sub-glue-taking portion 3867 presses the second part 512 of the first tape 510 against the end covering area 440 and contracts, so that the first sub-glue-taking portion 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. The first cutting mechanism 383 is configured to cut out two first tapes 510 from the release portion. The number of the first glue-taking members 3861 is two, and each adsorbs a corresponding first tape 510. The first tape attaching assembly 380 includes the first glue-taking mechanism 386. The first glue-taking mechanism 386 is used for adsorbing and taking away the first 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 distributing cylinder 3869. The first glue-taking member 3861 is used for adsorbing the first tape 510. The first glue-taking motor 3862 is disposed 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 portion. The second glue-taking motor 3863 is disposed on the second glue-taking bracket 3865 and drives the third glue-taking bracket 3868 and two first glue-taking members 3861 to approach and move away from the plane where the release portion is located.The glue dispensing cylinder 3869 is arranged on the third glue taking bracket 3868. The glue dispensing cylinder 3869 is arranged to drive 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 of the electrode assembly 200 spaced along the third direction D3. 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 move relative to each other. 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 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 coating areas 410 respectively. 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 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 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 part. 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 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 switching cylinder 3941 and a tape pulling position switching bracket 3942. The tape pulling position switching cylinder 3941 is arranged on the tape pulling bracket 394, and the second tape pulling mechanism 392 is arranged on the tape pulling position switching bracket 3942. The tape pulling position switching cylinder 3941 is arranged to drive the tape pulling position switching bracket 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 a standby position and a working position for the second tape pulling mechanism 392 to operate. One group of the second 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. The second glue taking mechanism 395 is used to adsorb and take away 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 configured to drive the second pressing block 3931 to press the release portion against the second glue-taking mechanism 395, and drive the second cutter 3932 to cut out the second tape 520 from the release portion. The second tape attaching assembly 390 includes a second glue-taking mechanism 395, and the second glue-taking mechanism 395 is used to adsorb and pick up 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 disposed on the fourth glue-taking bracket 3953, and drives the second glue-taking member 3951 to move to be disposed opposite to the release portion along the thickness direction D6 of the release portion, and drives the second glue-taking member 3951 to approach and move away from the plane where the release portion is located. The second glue-taking member 3951 has 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. 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. 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 release portion. The second glue-taking mechanism 395 includes a glue-taking switching cylinder 3956 and a glue-taking switching bracket 3957. The glue-taking switching cylinder 3956 is disposed on the fourth glue-taking bracket 3953, and the second glue-taking member 3951 is disposed on the glue-taking switching bracket 3957. The glue-taking switching cylinder 3956 is configured to drive the glue-taking switching 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. A set of second unwinding mechanism 391 and second cutting mechanism 393 are provided at the standby position and the working position respectively. 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 stacked. The covering device 300 further includes a turntable 350, and the turntable 350 is configured to rotate around a predetermined rotation axis. The number of the first covering assemblies 330 is at least two, and they are arranged at intervals around the rotation axis on the turntable 350. The turntable 350 drives at least two first covering assemblies 330 to pass through the first positioning assembly 310 in sequence.

[0363] 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.

[0364] 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.

[0365] 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.

[0366] 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.

[0367] In addition, the assembly equipment is not limited to including a pole ear welding device, a shell insertion device, a pole ear piercing device, a pole column welding device and a bottom cover welding device. Exemplarily, when the electrode assembly 200 includes a plurality of electrode modules 220, for example, two electrode modules 220, the assembly equipment further includes a matching component, which is used to stack the plurality of electrode modules 220 so that the pole ear sheets of the two electrode modules 220 are roughly opposite, so that the conveying structure can convey the matched electrode modules 220 to the pole ear welding device for welding the pole ear sheets to facilitate the formation of the pole ear portion 201. Exemplarily again, in order to ensure the reliability of the battery assembly process, dust removal, NG detection stations, etc. can also be added between any two adjacent stations, which is not limited in this embodiment.

[0368] According to some embodiments of the present application, the electrode assembly described in the embodiment of the coating method of the electrode assembly includes an electrode body and an electrode tab. 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 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 electrode tab protrudes from the first of the two end surfaces. The coating method includes: S100: 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, and an opening is provided in the connection region. S200: Position the electrode assembly using a first positioning assembly and make the electrode tab face the connection region. S300: Control at least one of the first positioning assembly and the first coating assembly to drive the electrode assembly and the coating film to move relative to each other, so that the electrode tab passes through the opening, and the connection region contacts and coats the first of the two end surfaces.

[0369] According to some embodiments of the present application, optionally, positioning the coating film using the first coating assembly includes:

[0370] S110: Before the first of the two end surfaces contacts the connection region, control the first coating assembly to make the connection region and the two main coating regions coplanar with each other.

[0371] According to some embodiments of the present application, optionally, controlling at least one of the first positioning assembly and the first coating assembly to drive the electrode assembly and the coating film to move relative to each other includes:

[0372] S310: Control at least one of the first positioning assembly and the first coating assembly to drive the electrode assembly and the coating film to approach each other along the second direction, and after the first of the two end surfaces contacts the connection region, drive the electrode assembly to continue to move along the second direction relative to the end of the two main coating regions away from the connection region.

[0373] S320: Control the first coating assembly to drive the ends of the two main coating regions to approach each other along the first direction, so that the two main coating regions contact and coat the exposed portions of the corresponding one of the two main surfaces.

[0374] According to some embodiments of the present application, optionally, positioning the coating film using the first coating assembly includes:

[0375] S120: Before the first of the two end surfaces contacts the connection region, control the first coating assembly to make the connection region and the first of the two main coating regions bend with respect to each other.

[0376] According to some embodiments of the present application, optionally, the first covering assembly includes a first sub-covering assembly and a second sub-covering assembly. The first sub-covering assembly clamps and fixes the end of the covering film away from the first of the two main covering areas, and the second sub-covering assembly is used to support and position the first of the two main covering areas.

[0377] Controlling at least one of the first positioning assembly and the first covering assembly to drive the electrode assembly and the covering film to move relative to each other includes:

[0378] S330: Control the first positioning assembly to drive the electrode assembly in the second direction so that the first of the two end faces contacts the connection area.

[0379] S340: Control the first positioning assembly to drive the electrode assembly in the first direction so that the first of the two main faces contacts the first of the two main covering areas.

[0380] S350: Control the first sub-covering assembly to drive the end of the covering film away from the first of the two main covering areas in the first direction and the second direction so that the second of the two main covering areas contacts the second of the two main faces.

[0381] Regarding the embodiments of the covering method of the electrode assembly of the present application, reference may be made to the relevant content of the embodiments of the covering equipment of the electrode assembly above, and details will not be repeated here.

[0382] In summary, the embodiments of the present application can adjust the relative positional relationship between the electrode assembly and the covering film by setting the first positioning assembly and the first covering assembly, and can adjust the relative positional relationship between the first of the two end faces and the connection area. When the covering film covers the first of the two end faces, the stability of the covering process can be improved. By providing an opening in the connection area, the opening can avoid the pole ear part, which can reduce the interference of the pole ear part on the covering process, thereby improving the covering effect of the covering film on the first of the two end faces.

[0383] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit 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 on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within 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 falling 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 and an electrode tab, 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 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 electrode tab protrudes from the first of the two end surfaces, and the coating device includes: 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, and an opening is provided on the connection region; a first positioning assembly configured to position the electrode assembly and orient the electrode tab towards the connection region; 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 electrode tab passes through the opening with the relative movement between the first positioning assembly and the first coating assembly, and the connection region contacts and coats the first of the two end surfaces.

2. The coating device according to claim 1, characterized in that, before the first of the two end surfaces contacts the connection region, the first coating assembly is configured to make the connection region and the two main coating regions coplanar with each other.

3. The coating device according to claim 1 or 2, characterized in that, at least one of the first positioning assembly and the first coating assembly is configured to move along the second direction, so that the electrode assembly and the coating film approach each other along the second direction, and after the first of the two end surfaces contacts the connection region, the electrode assembly continues to move along the second direction relative to the end of the connection region away from the two main coating regions, and the first coating assembly is configured to move along the first direction, so that the ends of the two main coating regions approach each other along the first direction, thereby making the two main coating regions contact and coat the exposed part of the corresponding one of the two main surfaces.

4. The coating device according to claim 1, characterized in that, the first positioning assembly includes an electrode clamp, and the electrode clamp is configured to clamp and fix the electrode body from the outside of the two side surfaces along the third direction, or is configured to clamp and fix the electrode body from the outside of the two main surfaces along the first direction.

5. The coating device according to claim 4, characterized in that, the first positioning assembly includes an electrode driving mechanism, and the electrode driving mechanism is configured to drive the electrode clamp to move along the second direction, so that after the first of the two end surfaces contacts the connection region, the first of the two end surfaces and the connection region continue to move synchronously along the second direction.

6. The coating device according to claim 5, characterized in that, The electrode driving mechanism includes an electrode driving motor, a first electrode bracket, and a second electrode bracket. The electrode driving motor is disposed on the first electrode bracket and is configured to drive the second electrode bracket to move relative to the first electrode bracket along the second direction. The electrode fixture is disposed on the second electrode bracket and includes electrode jaws and an electrode clamping cylinder. The electrode clamping cylinder is configured to drive the electrode jaws to clamp and fix the electrode body.

7. The covering device according to claim 3, wherein, the first covering assembly includes two first sub-covering assemblies spaced apart from each other. Each first sub-covering assembly includes a film fixture and a first film driving mechanism. The two film fixtures 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 fixtures to move closer to each other along the first direction, so that the area of the main covering area not clamped by the film fixtures can be bent relative to the connection area toward the corresponding main surface.

8. The covering device according to claim 7, wherein, the first film driving mechanism includes a first film driving motor, a first film bracket, and a second film bracket. The first film driving motor is disposed on the first film bracket and is configured to drive the second film bracket to move relative to the first film bracket along the first direction. The film fixture is disposed on the second film bracket and includes film jaws and a film clamping cylinder. The film clamping cylinder is configured to drive the film jaws to clamp and fix the covering film.

9. The covering device according to claim 7, wherein, each first sub-covering assembly further includes a second film driving mechanism. The two second film driving mechanisms respectively drive the corresponding film fixtures to rotate, so that the movement trend of the area of the covering film clamped by the film fixtures 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.

10. The covering device according to claim 9, wherein, the first film driving mechanism includes a first film driving motor, a first film bracket, and a second film bracket. The first film driving motor is disposed on the first film bracket and is configured to drive the second film bracket to move relative to the first film bracket along the first direction. The second film driving mechanism includes a second film driving motor. The second film driving motor is disposed on the second film bracket and drives the film fixture to rotate. The film fixture includes film jaws and a film clamping cylinder. The film clamping cylinder is configured to drive the film jaws to clamp and fix the covering film.

11. The covering device according to claim 7 or 9, wherein, each first sub-covering assembly further includes a third film driving mechanism. The two third film driving mechanisms respectively drive the corresponding film fixtures to move along the second direction. Alternatively, the first positioning component includes an electrode fixture and an electrode transmission mechanism. The electrode fixture is configured to clamp and fix the electrode body, and the electrode transmission mechanism is configured to drive the electrode fixture to move along the second direction towards the side where the coating film is located, 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; the third film transmission mechanism is configured to drive the corresponding film fixture to move along the second direction.

12. The coating device according to claim 11, wherein, the first film transmission mechanism includes a first film transmission motor, a first film support, and a second film support. The first film transmission motor is disposed 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 transmission mechanism includes a third film transmission motor and a third film support. The third film transmission motor is disposed 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 transmission mechanism includes a second film transmission motor. The second film transmission motor is disposed on the third film support and drives the film fixture to rotate. The film fixture includes film clamping jaws and a film clamping cylinder. The film clamping cylinder is configured to drive the film clamping jaws so that the film clamping jaws clamp and fix the coating film.

13. The coating device according to claim 1, wherein, before the first of the two end faces contacts the connection area, the first coating component is configured to bend the connection area and the first of the two main coating areas with respect to each other.

14. The coating device according to claim 13, wherein, before the first of the two end faces contacts the connection area, the first coating component is configured to make the connection area and the second of the two main coating areas coplanar with respect to each other.

15. The coating device according to claim 13 or 14, wherein, the first coating component includes a first sub-coating component and a second sub-coating component. The first sub-coating component clamps and fixes the end of the coating film away from the first of the two main coating areas, and the second sub-coating component is used to support and position the first of the two main coating areas.

16. The coating device according to claim 15, wherein, the first positioning component is configured to move along the second direction so that the first of the two end faces contacts the connection area, and the first positioning component is further configured to move along the first direction so that the first of the two main faces contacts the first of the two main coating areas. The first sub-coating component is configured to move along the first direction and the second direction so that the second of the two main coating areas contacts the second of the two main faces.

17. The coating device according to claim 1, 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 configured to drive the side coating area into contact with and coat on the side surface.

18. The coating device according to claim 17, wherein, the second coating assembly includes a side pressing plate, a first pressing plate driving mechanism, and a second pressing plate driving mechanism. The first pressing plate driving mechanism is configured to drive the side pressing plate in 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 driving mechanism is configured to drive the side pressing plate in the third direction so that the side pressing plate presses the side coating area against the side surface.

19. The coating device according to claim 18, wherein, the coating film includes an end coating area connected to the main coating area, and the second coating assembly is configured to drive the end coating area into contact with and coat on the second one of the two end surfaces.

20. The coating device according to claim 19, wherein, the second coating 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 configured to drive the end face pressing plate in the first direction so that the end face pressing plate pushes the end coating area to bend towards the second one of the two end surfaces relative to the main coating area, and the third pressing plate driving mechanism is configured to drive the end face pressing plate in the second direction so that the end face pressing plate presses the end coating area against the second one of the two end surfaces.

21. The coating device according to claim 20, 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 disposed 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 disposed 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 disposed 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.

22. The coating device according to claim 1, wherein, The covering film further includes a side covering area and an end covering area connected to the main covering area, wherein the side covering area covers the side surface, and the end covering area covers the second of the two end surfaces. The covering 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 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 surfaces.

23. The covering device according to claim 22, 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 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.

24. The covering device according to claim 23, wherein, 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 and pull the released portion.

25. The covering device according to claim 23, wherein, 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 the first unwinding mechanism and the first cutting mechanism 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 the first unwinding mechanism and the first cutting mechanism 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.

26. The covering device according to claim 23, wherein, 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 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 configured to drive the first pressing block to press the released portion onto the first tape picking mechanism and drive the first cutting knife to cut out the first tape from the released portion.

27. The covering device according to claim 23, wherein, The first tape attaching assembly includes a first glue-taking mechanism for adsorbing and taking 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 bracket, and a second glue-taking bracket. The first glue-taking member is used for adsorbing the first tape. The first glue-taking motor is arranged on the first glue-taking bracket and drives the second glue-taking bracket 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 bracket and drives the first glue-taking member to approach and move away from the plane where the release portion is located.

28. The covering device according to claim 27, 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 for adsorbing the first part of the first tape and attaching it to the side covering area. The second sub-glue-taking portion is used for adsorbing the second part of the first tape and attaching it to the end covering area.

29. The covering device according to claim 28, 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. The first sub-glue-taking portion presses the first part of the first tape against 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 portion is a telescopic member. The second glue-taking motor drives the first glue-taking member in the second direction. The second sub-glue-taking portion is used for pressing the second part of the first tape against the end covering area and contracting, so that the first sub-glue-taking portion 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.

30. The covering device according to claim 23, 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. 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 bracket, a second glue-taking bracket, a third glue-taking bracket, and a glue separating cylinder. The number of the first glue-taking members is two, and each adsorbs a corresponding first tape. The first glue-taking motor is arranged on the first glue-taking bracket and drives the second glue-taking bracket 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 bracket and drives the third glue-taking bracket and the two first glue-taking members 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 bracket and is configured to drive the two first glue-taking members to move away from each other, so that the two first glue-taking members respectively correspond to two corners of the electrode assembly spaced apart in the third direction.

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

32. The coating device according to claim 31, wherein, the number of the first parts of the second tape is two and they are located at both ends of the second part of the second tape. 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 coating areas respectively.

33. The coating device according to claim 31 or 32, 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 released part of the second tape roll. The second cutting mechanism is configured to cut out the second tape from the released part of the second tape roll.

34. The coating device according to claim 33, wherein, 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 released part, and the second tape pulling motor is used to drive the second tape clamping member to move to pull the released part.

35. The coating device according to claim 33, 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 released part. 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 configured to drive the tape pulling position-changing support to move along the interval direction of the two second unwinding mechanisms so that the second tape pulling mechanism can switch between the two sets of the second unwinding mechanisms and the second cutting mechanisms.

36. The coating device according to claim 33, wherein, the second tape attaching assembly includes a second tape picking mechanism for adsorbing and picking 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 configured to drive the second pressing block to press the released part onto the second tape picking mechanism and drive the second cutting knife to cut out the second tape from the released part.

37. The coating device according to claim 33, 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 bracket. The second glue-taking member is used for adsorbing the second tape. The fourth glue-taking motor is arranged on the fourth glue-taking bracket and is used for driving the second glue-taking member to move laterally along the main surface of the release portion and for driving the second glue-taking member to approach and move away from the plane where the release portion is located.

38. The covering device according to claim 37, wherein, the second 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.

39. The covering device according to claim 38, wherein, the fourth sub-glue-taking portion is a telescopic member. The fourth glue-taking motor drives the second glue-taking member along the third direction. The fourth sub-glue-taking portion is used for pressing and holding the second part of the second tape on the side covering area and contracting, so that the third sub-glue-taking portion can continue to move along the third direction and fit the main covering area, and then attach the first part of the second tape to the main covering area.

40. The covering device according to claim 37, wherein, the second unwinding mechanism and the second cutting mechanism are two corresponding groups and are arranged at intervals along the width direction of the release portion. The second glue-taking mechanism includes a glue-taking switching cylinder and a glue-taking switching bracket. The glue-taking switching cylinder is arranged on the fourth glue-taking bracket, and the second glue-taking member is arranged on the glue-taking switching bracket. The glue-taking switching cylinder is configured to drive the glue-taking switching bracket to move along the interval direction between the two second unwinding mechanisms, so that the second glue-taking member can be switched between the two groups of the second unwinding mechanisms and the second cutting mechanism.

41. The covering device according to claim 1, wherein, 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 stacked.

42. The covering device according to claim 1, wherein, the covering device further includes a turntable configured to rotate around a predetermined rotation axis. The number of the first covering assemblies is at least two, and they are arranged at intervals around the rotation axis on the turntable. The turntable drives the at least two first covering assemblies to sequentially pass through the first positioning assembly.

43. A method for covering an electrode assembly, wherein, The electrode assembly includes an electrode body and a tab. 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 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 tab protrudes from the first of the two end surfaces. The coating method includes: Positioning 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 between the two main coating regions, and an opening is provided in the connection region; Positioning the electrode assembly using a first positioning assembly and arranging the tab towards the connection region; Controlling at least one of the first positioning assembly and the first coating assembly to move relative to the other, so that the tab passes through the opening, and the connection region contacts and coats the first of the two end surfaces.

44. The coating method according to claim 43, wherein, the positioning the coating film using the first coating assembly includes: Before the first of the two end surfaces contacts the connection region, controlling the first coating assembly to make the connection region and the two main coating regions coplanar with each other.

45. The coating method according to claim 43 or 44, wherein, the controlling at least one of the first positioning assembly and the first coating assembly to move relative to the other includes: Controlling at least one of the first positioning assembly and the first coating assembly to approach each other along the second direction, so that after the first of the two end surfaces contacts the connection region, the electrode assembly continues to move along the second direction relative to the end of the two main coating regions away from the connection region; Controlling the first coating assembly to move along the first direction, so that the ends of the two main coating regions approach each other, and further making the two main coating regions contact and coat the exposed portion of the corresponding one of the two main surfaces.

46. The coating method according to claim 43, wherein, the positioning the coating film using the first coating assembly includes: Before the first of the two end surfaces contacts the connection region, controlling the first coating assembly to make the connection region and the first of the two main coating regions bend with respect to each other.

47. The coating method according to claim 43 or 46, wherein, the first coating assembly includes a first sub-coating assembly and a second sub-coating assembly. The first sub-coating assembly clamps and fixes the end of the coating film away from the first of the two main coating regions, and the second sub-coating assembly is used to support and position the first of the two main coating regions; the controlling the first positioning assembly and the first coating assembly to perform relative movement includes: Controlling the first positioning assembly to move along the second direction, so that the first of the two end surfaces contacts the connection region; Control the first positioning component to move along the first direction so that the first of the two main surfaces contacts the first of the two main covering regions; Control the first sub-covering component to move along the first direction and the second direction so that the end of the covering film away from the first of the two main covering regions causes the second of the two main covering regions to contact the second of the two main surfaces.

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