Electrode assembly coating apparatus and coating method

Abstract

The invention discloses a coating device and a coating method of an electrode assembly, the electrode assembly comprises an electrode main body, the electrode main body has a first direction, a second direction and a third direction which are orthogonal to each other and comprises two main surfaces, two end surfaces and two side surfaces, and the coating device comprises a discharging assembly, a cutting assembly and a first coating assembly. The discharging assembly is used for storing and releasing a material belt, the material belt comprises a plurality of coating films which are sequentially connected in the length direction of the material belt, and each coating film comprises two main coating areas arranged in a spaced mode and a connecting area connected between the two main coating areas. The cutting assembly is used for cutting off the head end coating film located at the head end of the material belt from the material belt. The first wrapping assembly is used for wrapping the connecting area of the head end wrapping film on the first one of the two end faces and wrapping the two main wrapping areas on the corresponding one of the two main faces respectively so as to form an electrode wrapping body. In this way, the motion complexity of the coating process can be simplified.

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, a coating device is required to coat the coating film on the electrode assembly. However, the existing coating devices have relatively complex operations and are not convenient for maintaining the coating devices. 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 simplify the complexity of the operations in the coating process and facilitate the maintenance of the coating device.

[0005] In a first aspect, the present application provides a coating device for an electrode assembly. The electrode assembly includes an electrode body, the electrode body having a first direction, a second direction, and a third direction that are orthogonal to each other, and including two main surfaces arranged opposite to each other along the first direction, two end surfaces arranged opposite to each other along the second direction, and two side surfaces arranged opposite to each other along the third direction. The coating device includes a feeding assembly, a cutting assembly, and a first coating assembly. The feeding assembly is used for storing and releasing a tape. The tape includes a plurality of coating films sequentially connected along the length direction of the tape. Each coating film includes two main coating regions arranged at intervals from each other and a connecting region connected between the two main coating regions. The cutting assembly is used for cutting the leading coating film at the leading end of the tape from the tape. The first coating assembly is used for coating the connecting region of the leading coating film on the first of the two end surfaces and coating the two main coating regions on the corresponding one of the two main surfaces respectively to form an electrode coating body.

[0006] In the above manner, the first coating assembly can drive the electrode assembly close to the leading coating film, so that the connecting region of the leading coating film contacts and coats on the first of the two end surfaces, and the two main coating regions are respectively coated on the corresponding one of the two main surfaces. With such an arrangement, the coating film can be continuously fed, the arrangement of the manipulators can be reduced, the complexity of the operations in the coating process can be simplified, and the maintenance of the coating device can be facilitated.

[0007] In some embodiments, the first coating assembly includes an electrode driving mechanism and a main surface coating mechanism. The electrode driving mechanism is configured to convey the electrode assembly in a second direction such that a first one of the two end faces contacts the connection region. The main surface coating mechanism is configured to continue driving the electrode assembly in the second direction after the first one of the two end faces contacts the connection region, and cause the two main coating regions to be respectively coated on a corresponding one of the two main surfaces.

[0008] In the above manner, by providing the electrode driving mechanism and the main surface coating mechanism, the relative positional relationship between the two main surfaces and the two coating regions can be adjusted, and the relative positional relationship between the first one of the two end faces and the connection region can be adjusted. When the coating film coats the two main surfaces and the first one of the two end faces of the electrode body, the stability of the coating process can be improved, making the coating operation simpler and smoother.

[0009] In some embodiments, the main surface coating mechanism includes two sets of pressing rollers arranged side by side and spaced apart from each other. After the first one of the two end faces of the electrode assembly contacts the connection region, the electrode driving mechanism feeds the electrode assembly and the first-end coating film between the two sets of pressing rollers. The two sets of pressing rollers drive the electrode assembly in a rolling manner and press the two main coating regions onto a corresponding one of the two main surfaces respectively.

[0010] In the above manner, during the process of the coating film coating the two main surfaces, the arrangement and use of the manipulator can be reduced, the complexity of the operation of the coating equipment for pressing the two main coating regions onto the two main surfaces respectively can be simplified, and the maintenance of the coating equipment is facilitated.

[0011] In some embodiments, at least one of the two sets of pressing rollers is configured to be floatingly arranged in a first direction.

[0012] In the above manner, the distance between the two sets of pressing rollers can be adjusted, so that the distance between the two sets of pressing rollers can more accurately match the dimension of the electrode assembly in the first direction, improving the coating effect.

[0013] In some embodiments, one of the two sets of pressing rollers is an active pressing roller set, or the two sets of pressing rollers are respectively active pressing roller sets, and the moving direction of the contact point between the active pressing roller set and the main surface is the same as the moving direction of the electrode driving mechanism.

[0014] In the above manner, the resistance of the pressing roller set to the movement of the electrode assembly in the second direction can be reduced, and the movement stability of the electrode assembly and the first-end coating film entering between the two sets of pressing rollers can be improved.

[0015] In some embodiments, the first covering assembly further includes a first film positioning mechanism and a second film positioning mechanism. The first film positioning mechanism is used to position one end of the first-end covering film facing the feeding assembly, and the second film positioning mechanism is used to position the other end of the first-end covering film away from the feeding assembly, so that before the first of the two end faces contacts the connection area, the connection area of the first-end covering film and the two main covering areas are coplanar with each other, and the second direction is perpendicular to the plane where the connection area is located.

[0016] In the above manner, by setting the connection area and the two main covering areas to be coplanar with each other, the two main covering areas will not block the connection area, which can reduce the interference of the two main covering areas on the process of the first of the two end faces contacting the connection area, thereby improving the covering efficiency and covering effect.

[0017] In some embodiments, the first covering assembly further includes a third film positioning mechanism. The third film positioning mechanism is located on the side of the first film positioning mechanism facing the feeding assembly and is used to position the subsequent covering film adjacent to the first-end covering film. The cutting assembly cuts the strip between the first film positioning mechanism and the third film positioning mechanism.

[0018] In the above manner, during the cutting process, the first film positioning mechanism and the third film positioning mechanism can position both sides of the preset position, thereby improving the stability of the cutting process and the cutting effect.

[0019] In some embodiments, the third film positioning mechanism is further configured to feed the subsequent covering film into the first film positioning mechanism and the second film positioning mechanism after the first-end covering film is cut off from the strip.

[0020] In the above manner, the feeding of the covering film can be continuously connected between different positions, improving the stability of the covering process.

[0021] In some embodiments, the electrode assembly further includes a pole ear protruding from the first of the two end faces, and an opening is provided on the connection area. The first covering assembly is configured such that the pole ear passes through the opening.

[0022] In the above manner, after the pole ear passes through the opening, the pole ear can limit the connection area, thereby reducing the risk of the covering film sliding and shifting relative to the electrode assembly.

[0023] In some embodiments, the feeding assembly includes two feeding mechanisms, each feeding mechanism stores and releases the strip respectively. The strip corresponding to the first of the two feeding mechanisms is used as the working strip and is fed into the first covering assembly. The strip corresponding to the second of the two feeding mechanisms is used as the spare strip. The covering device further includes a switching component, and the switching component is used to fix the spare strip to the working strip so that the spare strip is fed into the first covering assembly under the drive of the working strip.

[0024] In the above - mentioned manner, when the working material tape is about to be used up, the coating film on the spare material tape can be automatically fed into the first coating assembly without stopping the machine to change the roll, so as to continuously supply the coating film to the first coating assembly and improve the coating efficiency of the coating equipment.

[0025] In some embodiments, the switching assembly includes two pressing mechanisms and a material - tape cutting mechanism. The two pressing mechanisms cooperate with each other to clamp the working material tape and the spare material tape from both sides of the working material tape and the spare material tape. The material - tape cutting mechanism cuts off the working material tape and the spare material tape in the clamped state, so that the working material tape and the spare material tape respectively form an upstream part and a downstream part located upstream and downstream of the cutting position of the material - tape cutting mechanism. The two pressing mechanisms connect the downstream part of the working material tape with the upstream part of the spare material tape.

[0026] In the above - mentioned manner, when the working material tape is about to be used up, the coating film on the spare material tape can replace the working material tape and be automatically fed into the first coating assembly without stopping the machine to change the roll, so as to continuously supply the coating film to the first coating assembly and improve the coating efficiency.

[0027] In some embodiments, the two pressing mechanisms respectively include pressing members, and at least one of the two pressing mechanisms includes a pressing driving member. The pressing member includes a first pressing area and a second pressing area separated by a slot. The pressing driving member drives at least one pressing member so that the two first pressing areas cooperate with each other to clamp the working material tape and the spare material tape, and the two second pressing areas cooperate with each other to clamp the working material tape and the spare material tape. The material - tape cutting mechanism includes a cutting knife. The cutting knife is telescopically arranged in the slot of the first of the two pressing members and extends into the slot of the second of the two pressing members in the clamped state, and then cuts off the working material tape and the spare material tape.

[0028] In the above - mentioned manner, with one cutting action of the cutting knife, the working material tape and the spare material tape can be cut into two parts respectively. Such a setting can improve the cutting efficiency and simplify the cutting structure.

[0029] In some embodiments, the material - tape cutting mechanism includes an elastic member. The elastic member is arranged to elastically support the first of the two pressing members, so that the first of the two pressing members elastically retracts in the clamped state, and then the cutting knife extends out of the slot of the first of the two pressing members.

[0030] In the above - mentioned manner, there is no need to set a specific power device to drive the cutting knife to move relative to the two pressing members, which can simplify the cutting structure.

[0031] In some embodiments, the first of the two pressing mechanisms is arranged to simultaneously adsorb the downstream part of the working material tape and the upstream part of the spare material tape, and the second of the two pressing mechanisms is arranged to apply a connecting tape at the joint position of the downstream part of the working material tape and the upstream part of the spare material tape.

[0032] In the above manner, the connection efficiency and working stability of the downstream part of the working strip and the upstream part of the spare strip can be improved.

[0033] In some embodiments, the two pressing mechanisms respectively include pressing members. The pressing member of the first of the two pressing mechanisms is configured to adsorb the downstream part of the working strip and the upstream part of the spare strip simultaneously. The second of the two pressing mechanisms includes a pressing driving member, a rotating driving member, and an adhesive pasting member. The adhesive pasting member is configured to carry a connecting tape. The rotating driving member is configured to be able to rotate and drive the adhesive pasting member and the pressing member of the second of the two pressing mechanisms to switch between a first state and a second state. In the first state, the pressing members of the two pressing mechanisms are arranged opposite to each other. In the second state, the adhesive pasting member is arranged opposite to the pressing member of the first of the two pressing mechanisms. The pressing driving member is configured to drive the pressing members of the two pressing mechanisms to press against each other in the first state, and to drive the adhesive pasting member and the pressing member of the first of the two pressing mechanisms to press against each other in the second state.

[0034] In the above manner, the movement stability of the pressing member and the adhesive pasting member can be improved, and the cutting effect and the connection effect of the connecting tape can be enhanced.

[0035] In some embodiments, the feeding assembly corresponding to the working strip is further configured to collect the upstream part of the working strip, and the switching assembly further includes a winding mechanism for collecting the downstream part of the spare strip.

[0036] In the above manner, the automation degree of the coating equipment can be improved.

[0037] In some embodiments, during the process of collecting the upstream part of the working strip and the downstream part of the spare strip, the two pressing mechanisms are in a separated state. The two pressing mechanisms are further configured to respectively adsorb the downstream part of the working strip and the upstream part of the spare strip, and after the upstream part of the working strip and the downstream part of the spare strip are collected, transfer the downstream part of the working strip and the upstream part of the spare strip to the first of the two pressing mechanisms.

[0038] In the above manner, after the two pressing mechanisms release the clamping of the working strip and the spare strip, the downstream part of the working strip and the upstream part of the spare strip will not loosen and misalign relative to the joint position, so as to improve the accuracy of connecting the downstream part of the working strip and the upstream part of the spare strip.

[0039] In some embodiments, the two pressing mechanisms each include a pressing member, and at least one of the two pressing mechanisms includes a pressing driving member. The pressing member includes a first pressing area and a second pressing area spaced apart from each other. The pressing driving member drives at least one pressing member so that the two first pressing areas cooperate with each other to clamp the working strip and the spare strip, and the two second pressing areas cooperate with each other to clamp the working strip and the spare strip. The strip cutting mechanism cuts the working strip and the spare strip in the interval area between the first pressing area and the second pressing area.

[0040] After the cutting is completed, the pressing driving member drives the two pressing members to separate from each other. The two pressing members respectively adsorb the downstream part of the working strip and the upstream part of the spare strip. After the upstream part of the working strip and the downstream part of the spare strip are collected, the pressing driving member drives the two pressing members to separate from each other, and the first of the two pressing mechanisms adsorbs the downstream part of the working strip and the upstream part of the spare strip at the same time.

[0041] In the above manner, the downstream part of the working strip and the upstream part of the spare strip can be stably positioned, so as to facilitate the connection of the downstream part of the working strip and the upstream part of the spare strip.

[0042] In some embodiments, the coating device further includes a positioning assembly, which is configured to clamp and fix the electrode coating body output by the first coating assembly from the outside of the two main coating areas.

[0043] In the above manner, the electrode coating body can be stably separated from the first coating assembly.

[0044] In some embodiments, the coating film includes a side coating area connected to the main coating area. The coating device further includes a second coating assembly. The positioning assembly transports the electrode coating body to the second coating assembly, and the second coating assembly is configured to drive the side coating area to contact and coat on the side surface.

[0045] In the above manner, by providing 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.

[0046] 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 used to drive the side pressing plate in the 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. The second pressing plate driving mechanism is used to drive the side pressing plate in the third direction so that the side pressing plate presses the side coating area on the side surface.

[0047] In the above manner, the actions of bending the side coating area by the second coating assembly and coating the side coating area on the side surface can be smoothly connected, which is beneficial to simplifying the actions and structure of the second coating assembly and improving the coating efficiency.

[0048] In some embodiments, the coating film includes an end coating region connected to the main coating region, and the second coating assembly is arranged to contact and coat the end coating region on the second of the two end faces.

[0049] In the above manner, the coating effect of the coating film on the electrode body can be improved.

[0050] 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 used to drive the end face pressing plate in a first direction so that the end face pressing plate pushes the end coating region to bend relative to the main coating region toward the second of the two end faces, and the third pressing plate driving mechanism is used to drive the end face pressing plate in a second direction so that the end face pressing plate presses the end coating region on the second of the two end faces.

[0051] In the above manner, when the end face pressing plate moves close to the electrode body in the second direction, the end coating region can be pressed on the second of the two end faces, so that the end coating region forms a coating on the second of the two end faces.

[0052] In some embodiments, the coating film further includes a side coating region and an end coating region connected to the main coating region, wherein the side coating region is coated on the side face, and the end coating region is coated on the second of the two end faces. The coating device further includes a first tape attaching assembly, which is used to drive the electrode assembly and the first tape to move relative to each other. The first tape includes a first part and a second part connected to each other. The first tape attaching assembly is arranged to attach the first part of the first tape to the side coating region and the second part of the first tape to the end coating region at the corner formed by the side face and the second of the two end faces.

[0053] In the above manner, the first tape can connect the side coating region and the end coating region together, so that the side coating region and the end coating region can be fixed relative to the electrode body, thereby improving the coating firmness of the coating film on the electrode body.

[0054] In some embodiments, the first tape attaching assembly includes a first tape unwinding mechanism, a first tape pulling mechanism, and a first cutting mechanism. The first tape unwinding mechanism is arranged to place and release the first tape roll, the first tape pulling mechanism is arranged to clamp and pull the leading end of the released part of the first tape roll, and the first cutting mechanism is arranged to cut out the first tape from the released part of the first tape roll.

[0055] In the above manner, it is beneficial to realize the automatic supply of the first tape.

[0056] 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 configured to drive the first tape clamping member to clamp the leading end of the release portion, and the first tape pulling motor is configured to drive the first tape clamping member to move so as to pull the release portion.

[0057] In the above manner, the release portion of the first tape roll can be extended, and the release portion of the first tape roll is stretched to facilitate cutting.

[0058] 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 disposed on the reel support. The switching motor drives the reel support to rotate about 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 disposed on the first tape picking support and drives the second tape picking support to move above the release portion. The second tape picking motor is disposed 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.

[0063] In the above manner, the movement freedom degree of the first tape picking member can be improved, which is convenient for sucking and transferring the first tape.

[0064] In some embodiments, 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 configured to adsorb a first part of the first tape and attach it to the side covering area. The second sub-glue-taking portion is configured to adsorb a second part of the first tape and attach it to the end covering area.

[0065] In the above manner, the coherence of the glue-taking action and the glue-attaching action can be improved.

[0066] In some embodiments, the first sub-glue-taking portion is a telescopic member. The second glue-taking motor drives the first glue-taking member in a 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. Alternatively, the second sub-glue-taking portion is a telescopic member. The second glue-taking motor drives the first glue-taking member in a second direction. The second sub-glue-taking portion presses the second part of the first tape against the end covering area and contracts, 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.

[0067] In the above manner, the structural flexibility of the first glue-taking member can be improved, enabling the first glue-taking member to adaptively adjust its shape according to the shape of the electrode body, thereby realizing diversified glue-attaching actions.

[0068] In some embodiments, the first cutting mechanism is configured to cut out two first tapes from the released portion. The number of the first glue-taking members is two, and each adsorbs a corresponding first tape. The first tape attaching assembly includes a first glue-taking mechanism for adsorbing and removing 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 first glue-taking member is used for adsorbing the first tape. The first glue-taking motor is disposed on the first glue-taking bracket and drives the second glue-taking bracket to move above the released portion. The second glue-taking motor is disposed 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 released portion is located. The glue separating cylinder is disposed 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.

[0069] In the above manner, the first glue-taking mechanism can adsorb and remove two first tapes corresponding to each electrode assembly, and then simultaneously attach the two first tapes to two corners of the electrode assembly spaced apart in the third direction, improving the glue-attaching efficiency.

[0070] In some embodiments, the coating device further includes a second tape attaching assembly for driving the electrode assembly and the second tape to move relative to each other. 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.

[0071] In the above manner, the side coating area and the main coating area can be fixed relative to the electrode body, thereby improving the firmness of the coating film on the electrode body.

[0072] In some embodiments, the number of the first parts of the second tape is two and located at both ends of the second part of the second tape. 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.

[0073] In the above manner, the contact area between the second tape and the coating film can be increased, and the fixing effect on the side coating area can be improved.

[0074] 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.

[0075] In the above manner, it is beneficial to automatically provide the second tape.

[0076] 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.

[0077] 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.

[0078] In some embodiments, the second unwinding mechanism and the second cutting mechanism are two corresponding sets and are spaced along the width direction of the released part. The second tape attaching assembly includes a tape pulling support, a tape pulling displacement cylinder, and a tape pulling displacement support. The tape pulling displacement cylinder is arranged on the tape pulling support, and the second tape pulling mechanism is arranged on the tape pulling displacement support. The tape pulling displacement cylinder is configured to drive the tape pulling displacement support to move along the interval direction of the two second unwinding mechanisms, so that the second tape pulling mechanism can be switched between a standby position and a working position for the second tape pulling mechanism to operate. A set of the second unwinding mechanism and the second cutting mechanism are arranged at the standby position and the working position respectively.

[0079] In the above manner, by providing two sets of second unwinding mechanisms and second cutting mechanisms, the interference of the rewinding operation of the second tape roll on the tape pulling process can be reduced, and the tape pulling efficiency can be improved. By setting the tape pulling displacement cylinder to drive the tape pulling displacement bracket 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 mechanism and second cutting mechanism that is working, facilitating the tape pulling operation.

[0080] 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 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 portion onto the second tape picking mechanism and drive the second cutting knife to cut out the second tape from the released portion.

[0081] In the above manner, the second pressing block can press and position the released portion, improving the stability of the cutting process.

[0082] 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 bracket. The second tape picking member is used for adsorbing the second tape. The fourth tape picking motor is arranged on the fourth tape picking bracket and drives the second tape picking member to move to a position opposite to the released portion along the thickness direction of the released portion and drive the second tape picking member to approach and move away from the plane where the released portion is located.

[0083] In the above manner, the degree of freedom of movement of the second tape picking member can be increased, facilitating the picking up and transferring of the second tape.

[0084] 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 part of the second tape and attaching it to the main covering area. The fourth sub-tape picking portion is used for adsorbing the second part of the second tape and attaching it to the side covering area.

[0085] In the above manner, the coherence of the tape picking action and the tape attaching action can be improved.

[0086] 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 presses the second part of the second tape onto the side covering area and contracts, enabling the third sub-tape picking portion to continue moving in the third direction and fit the main covering area, and then attaching the first part of the second tape to the main covering area.

[0087] In the above manner, the structural flexibility of the second glue-taking member can be improved, enabling the second glue-taking member to adaptively adjust its shape according to the shape of the electrode body, thereby realizing diversified glue-pasting actions.

[0088] In some embodiments, the second unwinding mechanism and the second cutting mechanism are two corresponding sets and are arranged at intervals along the width direction of the release 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 standby position and the working position for the second glue-taking mechanism to operate. A set of second unwinding mechanism and second cutting mechanism are provided at each of the standby position and the working position.

[0089] In the above manner, by configuring 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 mechanism and second cutting mechanism that is working, facilitating the glue-taking operation.

[0090] In a second aspect, the present application provides a method for coating an electrode assembly. The electrode assembly includes an electrode body having a first direction, a second direction, and a third direction that are orthogonal to each other, and includes two main surfaces arranged opposite to each other along the first direction, two end surfaces arranged opposite to each other along the second direction, and two side surfaces arranged opposite to each other along the third direction. The coating method includes: controlling the feeding assembly to release a tape, the tape including a plurality of coating films sequentially connected along the length direction of the tape, and each coating film including two main coating areas arranged at intervals from each other and a connecting area connecting between the two main coating areas. Controlling the cutting assembly to cut off the leading coating film at the leading end of the tape from the tape. Controlling the first coating assembly to coat the connecting area of the leading coating film on the first of the two end surfaces, and coat the two main coating areas on the corresponding one of the two main surfaces respectively to form an electrode coating body. In some embodiments, controlling the first coating assembly to coat the connecting area of the leading coating film on the first of the two end surfaces, and coat the two main coating areas on the corresponding one of the two main surfaces respectively, includes: controlling the electrode transmission mechanism to convey the electrode assembly along the second direction so that the first of the two end surfaces contacts the connecting area and feeds it between two pairs of pressing rollers. Controlling the two pairs of pressing rollers to continue to convey the electrode assembly in a rolling manner along the first direction and press the two main coating areas on the corresponding one of the two main surfaces respectively.

[0091] In some embodiments, the feeding assembly includes two feeding mechanisms, each of which stores and releases a strip of material. The strip of material corresponding to the first of the two feeding mechanisms serves as the working strip and is fed into the first wrapping assembly, while the strip of material corresponding to the second of the two feeding mechanisms serves as the spare strip. The wrapping method further includes: controlling the two pressing mechanisms to cooperate with each other to clamp the working strip and the spare strip from both sides. Controlling the strip cutting mechanism to cut the working strip and the spare strip in the clamped state, so that the working strip and the spare strip respectively form an upstream portion and a downstream portion located upstream and downstream of the cutting position of the strip cutting mechanism. Controlling the two pressing mechanisms to connect the downstream portion of the working strip with the upstream portion of the spare strip.

[0092] In some embodiments, controlling the two pressing mechanisms to connect the downstream portion of the working strip with the upstream portion of the spare strip includes: controlling the first of the two pressing mechanisms to simultaneously adsorb the downstream portion of the working strip and the upstream portion of the spare strip. Controlling the second of the two pressing mechanisms to apply a connecting tape at the joint position of the downstream portion of the working strip and the upstream portion of the spare strip.

[0093] In some embodiments, the electrode assembly includes a tab portion that protrudes from the first of the two end faces, and an opening is provided in the connection region. Controlling the first wrapping assembly to wrap the connection region of the head wrapping film around the first of the two end faces includes: controlling the first wrapping assembly to pass the tab portion through the opening, and the connection region contacts and wraps around the first of the two end faces.

[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 specific embodiments of the present application are hereinafter specifically exemplified. Description of the Drawings

[0095] By reading the following detailed description of the preferred embodiments, 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 It is a schematic structural diagram of a vehicle to which an electrode assembly according to one or more embodiments is applied;

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

[0098] Figure 3Schematic exploded view of a battery cell in which an electrode assembly is located according to one or more embodiments;

[0099] Figure 4 Schematic partial view of an electrode assembly according to one or more embodiments;

[0100] Figure 5 Schematic diagram of the structure of a coating device according to one or more embodiments;

[0101] Figure 6 Schematic diagram of the structure of a coating device coating an electrode assembly to form an electrode coating according to one or more embodiments;

[0102] Figure 7 Schematic diagram of the relative movement process of an electrode assembly and a coating film according to one or more embodiments;

[0103] Figure 8 Schematic diagram of the process of forming an electrode coating from a coating film and an electrode assembly according to one or more embodiments;

[0104] Figure 9 Schematic diagram of the structure of a main coating mechanism and an electrode coating according to one or more embodiments;

[0105] Figure 10 Schematic diagram of the structure of a switching component according to one or more embodiments;

[0106] Figure 11 is Figure 10 Schematic diagram of the structure of the pressing mechanism shown;

[0107] Figure 12 is Figure 10 Schematic diagram of the structure of another pressing mechanism shown;

[0108] Figure 13 Schematic diagram of the process of a positioning component flipping an electrode assembly according to one or more embodiments;

[0109] Figure 14 Schematic diagram of the structure of a second coating component coating an electrode assembly according to one or more embodiments;

[0110] Figure 15 Schematic diagram of the structure of a second coating component according to one or more embodiments;

[0111] Figure 16 is Figure 14 Schematic partial view of the second coating component driving a coating film and an electrode assembly shown;

[0112] Figure 17 is Figure 14 Schematic diagram of the structure of the coating film and the electrode assembly shown;

[0113] Figure 18 Schematic structural diagram of a coating film and an electrode assembly attached with a first tape and a second tape according to one or more embodiments;

[0114] Figure 19 Schematic structural diagram of a first tape attaching assembly according to one or more embodiments;

[0115] Figure 20 Schematic structural diagram of the cooperation of a first unwinding mechanism, a first glue feeding mechanism and a first tape roll according to one or more embodiments;

[0116] Figure 21 Schematic structural diagram of a first glue picking mechanism according to one or more embodiments;

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

[0118] Figure 23 Schematic structural diagram of a first cutting mechanism according to one or more embodiments;

[0119] Figure 24 Schematic structural diagram of a first glue picking member adsorbing a first tape according to one or more embodiments;

[0120] Figure 25 Schematic structural diagram of the cooperation of a second tape attaching assembly and an electrode assembly according to one or more embodiments;

[0121] Figure 26 Schematic structural diagram of the cooperation of a second unwinding mechanism, a second cutting mechanism, a second tape roll and a second glue feeding mechanism according to one or more embodiments;

[0122] Figure 27 Schematic structural diagram of a second glue pulling mechanism according to one or more embodiments;

[0123] Figure 28 Schematic structural diagram of a second glue picking mechanism adsorbing a second tape according to one or more embodiments;

[0124] Figure 29 For Figure 27 Partial schematic structural diagram of the second glue picking mechanism adsorbing the second tape shown;

[0125] Figure 30 Schematic structural diagram of a second cutting mechanism according to one or more embodiments;

[0126] Figure 31 Schematic structural diagram of a flipping assembly positioning an electrode assembly according to one or more embodiments;

[0127] Figure 32 Schematic structural diagram of an electrode assembly according to one or more embodiments.

[0128] Reference numerals in the specific embodiments are as follows:

[0129] 1000a vehicle;

[0130] 100a battery; 200a controller; 300a motor;

[0131] 10a box body; 11a first sub-box body; 12a second sub-box body; 101b accommodation space; 1 battery cell;

[0132] 100 housing; 110 accommodation housing; 112 open end; 120 end cap; 200 electrode assembly;

[0133] 201 tab; 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 tab; 222 separator 222; 223 negative electrode tab; 230 fixing member; 240 electrode coating;

[0134] 300 coating equipment; 310 feeding assembly; 311 feeding mechanism; 312 material collecting mechanism; 320 cutting assembly; 330 first coating assembly; 331 electrode driving mechanism; 332 main surface coating mechanism; 3321 spring; 3322 guide post; 3323 fixing bracket; 3324 floating bracket; 333 pressure roller group; 3331 pressure roller; 334 first film positioning mechanism; 3341 first roller; 335 second film positioning mechanism; 336 third film positioning mechanism; 3361 second roller;

[0135] 340 switching assembly; 341 pressing mechanism; 3411 pressing member; 3412 pressing driving member; 3413 slot; 3414 first pressing area; 3415 second pressing area; 3417 rotation driving member; 3418 adhesive applying member; 342 tape cutting mechanism; 3421 cutter; 3422 elastic member; 3423 support bracket;

[0136] 350 positioning assembly; 351 moving bracket; 352 clamping arm;

[0137] 360 flipping assembly; 361 main pressing cylinder; 362 main pressing member; 363 side pressing cylinder; 364 side pressing member; 365 rotation motor; 366 rotation bracket; 367 shifting motor; 368 shifting bracket;

[0138] 370 Second wrapping component; 371 Side pressing plate; 372 First pressing plate drive mechanism; 373 Second pressing plate drive mechanism; 374 End face pressing plate; 3741 End limit block; 3711 Side limit block; 375 Third pressing plate drive mechanism; 376 First pressing plate cylinder; 3761 Second pressing plate cylinder; 377 Pressing plate drive motor; 378 First pressing plate support; 379 Second pressing plate support;

[0139] 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 part; 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 part; 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;

[0140] 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 part; 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 part; 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;

[0141] 400 Wrapping film; 401 Tape; 402 Working tape; 403 Downstream part of the working tape; 404 Upstream part of the working tape; 405 Spare tape; 406 Downstream part of the spare tape; 407 Upstream part of the spare tape; 409 Head wrapping film; Subsequent wrapping film 411; 410 Main wrapping area; 420 Connection area; 421 Opening; 430 Side wrapping area; 440 End wrapping area;

[0142] 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;

[0143] D1 The first direction; D2 The second direction; D3 The third direction; D4 The width direction of the release part; D5 The interval direction between two second unwinding mechanisms; D6 The thickness direction of the release part; D7 The length direction of the strip; D8 The moving direction of the contact point between the active pressure roller group and the main surface; D9 The moving direction of the electrode driving mechanism. Detailed implementation manners

[0144] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0145] 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.

[0146] 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, "a plurality of" means more than two, unless otherwise specifically defined.

[0147] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0148] 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, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the front and rear associated objects.

[0149] In the description of the embodiments of the present application, the term "a plurality of" 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).

[0150] 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. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0151] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "link", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0152] 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.

[0153] 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 coating equipment to coat the coating film on the electrode assembly. However, the existing coating equipment has complex operations and is not convenient for maintaining the coating equipment.

[0154] In order to meet the requirement of simplifying the complexity of the operations in the coating process, the tape is arranged to include a plurality of coating films connected in sequence along the length direction of the tape, so that the tape can continuously provide the coating film. The unwinding assembly is arranged to store and release the tape, thus simplifying the complexity of the operation of taking the coating film. The cutting assembly is arranged to cut off the leading coating film at the leading end of the tape, enabling the coating films to be independent of each other.

[0155] Based on the above considerations, the present application provides a coating device and a coating method for an electrode assembly. The electrode assembly includes an electrode body having a first direction, a second direction, and a third direction that are orthogonal to each other, and includes two main surfaces arranged opposite to each other along the first direction, two end surfaces arranged opposite to each other along the second direction, and two side surfaces arranged opposite to each other along the third direction. The coating device includes a feeding assembly, a cutting assembly, and a first coating assembly. The feeding assembly is used to store and release a tape, and the tape includes a plurality of coating films sequentially connected along the length direction of the tape. Each coating film includes two main coating regions arranged at intervals from each other and a connecting region connected between the two main coating regions. The cutting assembly is used to cut off the leading coating film at the leading end of the tape from the tape. The first coating assembly is used to coat the connecting region of the leading coating film on the first of the two end surfaces, and coat the two main coating regions on the corresponding one of the two main surfaces respectively to form an electrode coating body. In this way, the coating film can be continuously fed, the arrangement of the manipulator can be reduced, the complexity of the actions in the coating process can be simplified, and the maintenance of the coating device is facilitated.

[0156] The coating device and the coating method for the electrode assembly disclosed in the embodiments of the present application are used to coat the electrode assembly with a coating film. The electrode assembly and the coating film are disposed in a battery, and the battery can be used in an electrical device using the battery as a power source or various energy storage systems using the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. 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, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0157] For the convenience of description in the following embodiments, a vehicle 1000a of an embodiment of the present application is taken as an example for illustration.

[0158] 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, the head, or the tail of the vehicle 1000a. The battery 100a can be used for the power supply of the vehicle 1000a. For example, the battery 100a can be used as the operating power source of the vehicle 1000a. The vehicle 1000a can further 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.

[0159] 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 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.

[0160] 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.

[0161] 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.

[0162] In the embodiments of the present application, the battery cell 1 can be a secondary battery, which means that the battery cell 1 can be activated by charging after discharging and can be used continuously. Each battery cell 1 can also be a primary battery.

[0163] 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.

[0164] 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.

[0165] In some embodiments, please refer to Figure 2 , the battery 100a can be a battery pack, which includes a box body 10a and battery cells 1. The battery cells 1 or the battery module are accommodated in the box body 10a.

[0166] In some embodiments, the box body 10a can be a 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 beam and longitudinal beam of the vehicle 1000a.

[0167] 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 may 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 may be a hollow structure with one end open, and the first sub-box body 11a may 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 may also both be hollow structures with one side open, and the open side of the first sub-box body 11a covers the open side of the second sub-box body 12a. Of course, the box body 10a formed by the first sub-box body 11a and the second sub-box body 12a can be of various shapes, such as a cylinder, a cuboid, etc.

[0168] In the battery 100a, there may 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 may further include other structures. For example, the battery 100a may further include a busbar component for realizing the electrical connection among the multiple battery cells 1.

[0169] Please refer to Figure 3 , a battery cell 1 refers to the smallest unit that makes up a battery. In this embodiment, a cylindrical battery cell 1 is taken as an example for description. As Figure 3 shown, the battery cell 1 includes a housing 100, an electrode assembly 200, and other functional components.

[0170] 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.

[0171] The housing 100 may include an end cap 120 and a containment shell 110. The end cap 120 refers to a component that covers the opening of the containment 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 containment shell 110 to match the containment shell 110. Optionally, the end cap 120 can be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cap 120 is not easily deformed when it is squeezed and collided, so that the battery cell 1 can have a higher structural strength and the safety performance can also be improved. Functional components such as poles can be provided on the end cap 120. The pole can be used to electrically connect to the electrode assembly 200 for outputting or inputting electrical energy of the battery cell 1. In some embodiments, the end cap 120 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The material of the end cap 120 can also be a variety of materials, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component may be disposed inside the end cap 120 to isolate the electrical connection components in the housing 110 from the end cap 120 to reduce the risk of short circuit. For example, the insulating component may be plastic, rubber, or the like.

[0172] The containment shell 110 is a component used to cooperate with the end cap 120 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 200, the electrolyte and other components. The containment shell 110 and the end cap 120 can be independent components, and the containment shell 110 and the end cap 120 can form the internal environment of the battery cell 1 after being connected. Without limitation, the end cap 120 and the containment shell 110 can also be integrated. Specifically, the end cap 120 and the containment shell 110 can form a common connection surface before other components enter the shell, and when it is necessary to encapsulate the interior of the containment shell 110, the end cap 120 covers the containment shell 110. The containment shell 110 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the containment shell 110 can be determined according to the specific shape and size of the electrode assembly 200. The material of the containment shell 110 can be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0173] 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.

[0174] 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 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. Figure 4As shown, the separator can be the diaphragm 222.

[0175] In some embodiments, as Figure 4 shown, the positive electrode can be the positive electrode tab 221, and the positive electrode tab 221 can include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0176] As an example, the positive current collector has two surfaces opposite to each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0177] As an example, the positive current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0178] As an example, the positive active material can 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 conventional materials that can be used as battery positive active materials can also be used. These positive active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates can include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, etc. Examples of lithium transition metal oxides can 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 NCM523 )), 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 its modified compounds, etc.

[0179] In some embodiments, as Figure 4 shown, the negative electrode can be the negative electrode tab 223, and the negative electrode tab 223 can include a negative electrode current collector.

[0180] 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, a carbon electrode, carbon, nickel or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0181] As an example, the negative electrode tab can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0182] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0183] As an example, the negative electrode active material can be the negative electrode active material for battery cell 1 well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0184] 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.

[0185] In some embodiments, the electrode assembly 200 further includes a separator disposed between the positive electrode and the negative electrode.

[0186] In some embodiments, the separator is a separator 222. The present application does not particularly limit the type of the separator 222, and any well-known porous structure separator 222 with good chemical stability and mechanical stability can be selected.

[0187] 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 attached to the surfaces of the positive and negative electrodes.

[0188] 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.

[0189] 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, or solid.

[0190] Among them, the electrolyte solution can be a form of the electrolyte. The electrolyte solution can include an electrolyte salt and a solvent.

[0191] In some embodiments, the electrolyte salt may 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.

[0192] In some embodiments, the solvent may 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 may also be an ether solvent. The ether solvent may 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.

[0193] Among them, the gel electrolyte includes a polymer as the skeletal network of the electrolyte, combined with an ionic liquid-lithium salt.

[0194] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0195] As an example, the polymer solid electrolyte may be polyether, polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, poly(ionic liquid)-lithium salt, cellulose, etc. As an example, the polymer solid electrolyte may be polyethylene oxide.

[0196] As an example, the inorganic solid electrolyte may be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0197] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0198] In some embodiments, the electrode assembly 200 has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0199] In some embodiments, the electrode assembly 200 is provided with tab portions 201, and the tab portions 201 can conduct current out of the electrode assembly 200. The tab portions 201 include a positive tab and a negative tab. The positive tab and the negative tab can be located at one end of the electrode body together or at both ends of the electrode body respectively.

[0200] According to some embodiments of the present application, as Figures 5 to 8 shown, the electrode assembly 200 described in the embodiment of the coating device of the electrode assembly of the present application includes an electrode body 210. The electrode body 210 has a first direction D1, a second direction D2, and a third direction D3 that are orthogonal to each other, and includes two main surfaces 211 arranged opposite to each other along the first direction D1, two end surfaces 212 arranged opposite to each other along the second direction D2, and two side surfaces 213 arranged opposite to each other along the third direction D3. The coating device 300 includes a feeding assembly 310, a cutting assembly 320, and a first coating assembly 330. The feeding assembly 310 is used for storing and releasing a tape 401. The tape 401 includes a plurality of coating films 400 sequentially connected along the length direction D7 of the tape 401. Each coating film 400 includes two main coating regions 410 arranged at intervals from each other and a connecting region 420 connected between the two main coating regions 410. The cutting assembly 320 is used for cutting the leading coating film 409 at the leading end of the tape 401 from the tape 401. The first coating assembly 330 is used for coating the connecting region 420 of the leading coating film 409 on the first one 212a of the two end surfaces 212, and coating the two main coating regions 410 on the corresponding one of the two main surfaces 211 respectively, so as to form an electrode coating body 240.

[0201] Specifically, the tape 401 can be placed in a roll on the feeding assembly 310. The feeding assembly 310 can gradually release the tape 401 from the tape roll, so that the released part of the tape 401 gradually approaches the first coating assembly 330. One end of the released part of the tape 401 is connected to the tape roll, and the other end of the released part of the tape 401 is the leading end of the tape 401. That is to say, the leading end of the tape 401 is the end of the tape 401 close to the first coating assembly 330. In the length direction D7 of the tape 401, the size of the released part of the tape 401 is larger than the size of one coating film 400. The leading coating film 409 is the coating film 400 closest to the leading end of the tape 401 on the released part of the tape 401, and the coating film 400 adjacent to the leading coating film 409 on the tape 401 is the subsequent coating film 411. In other words, the leading end of the tape 401 is on the leading coating film 409 to form an electrode coating body 240. As the previous leading coating film 409 is cut off from the released part of the tape 401 by the cutting assembly 320 and coated on the electrode assembly 200, the subsequent coating film 411 becomes the new leading coating film 409, and the leading end of the tape 401 is on the new leading coating film 409.

[0202] The first of the two end faces 212, i.e., 212a, can be connected between the two main faces 211 of the electrode body 210, so that while the connection area 420 wraps around the first of the two end faces 212, i.e., 212a, the two main wrapping areas 410 can respectively wrap around the two main faces 211. In some embodiments, the two main wrapping areas 410 are respectively movable relative to the connection area 420, so that when the connection area 420 wraps around the first of the two end faces 212, i.e., 212a, the two main wrapping areas 410 can wrap around the two main faces 211 by moving relative to the connection area 420. The first wrapping assembly 330 can be arranged to drive the two main wrapping areas 410 to move relative to the connection area 420 respectively.

[0203] The first wrapping assembly 330 can drive the electrode assembly 200 close to the first-end wrapping film 409, so that the connection area 420 of the first-end wrapping film 409 contacts and wraps around the first of the two end faces 212, i.e., 212a, and the two main wrapping areas 410 respectively wrap around the corresponding one of the two main faces 211. With such an arrangement, the wrapping film 400 can be continuously fed, the arrangement of the manipulator can be reduced, the complexity of the actions in the wrapping process can be simplified, and the maintenance of the wrapping device 300 can be facilitated.

[0204] According to some embodiments of the present application, optionally, as Figure 6 and Figure 9 shown, the first wrapping assembly 330 includes an electrode driving mechanism 331 and a main-face wrapping mechanism 332. The electrode driving mechanism 331 is used to convey 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 main-face wrapping mechanism 332 is used to continuously drive the electrode assembly 200 along the second direction D2 after the first of the two end faces 212, i.e., 212a, contacts the connection area 420, and make the two main wrapping areas 410 respectively wrap around the corresponding one of the two main faces 211.

[0205] The electrode driving mechanism 331 is in a moving state. For example, the electrode driving mechanism 331 may include a conveyor belt, a clamping jaw or a roller. The conveyor belt can move along the second direction D2 to drive the electrode assembly 200 to move along the second direction D2. The clamping jaw can move along the second direction D2 to clamp the electrode assembly 200 and move it along the second direction D2. The tangent direction of the roller at the contact position with the electrode assembly 200 is parallel to the second direction D2, so that the roller drives the electrode assembly 200 to move along the second direction D2 by rolling.

[0206] Furthermore, the electrode driving mechanism 331 can continuously convey a plurality of electrode assemblies 200 along the second direction D2. Each first-end wrapping film 409 and an electrode assembly 200 can form an electrode wrapping body 240.

[0207] The main wrapping mechanism 332 can drive the two main wrapping areas 410 to approach the electrode assembly 200 respectively until the two main wrapping areas 410 are respectively wrapped on the corresponding one of the two main surfaces 211.

[0208] When the electrode driving mechanism 331 conveys the electrode assembly 200, the acting position of the electrode driving mechanism 331 on the electrode assembly 200 may include the second one 212b among the two main surfaces 211, the two side surfaces 213 and the two end surfaces 212.

[0209] By arranging the electrode driving mechanism 331 and the main wrapping mechanism 332, the relative position relationship between the two main surfaces 211 and the two wrapping areas can be adjusted, and the relative position relationship between the first one 212a of the two end surfaces 212 and the connection area 420 can be adjusted. When the wrapping film 400 wraps the two main surfaces 211 and the first one 212a of the two end surfaces 212 of the electrode body 210, the stability of the wrapping process can be improved, making the wrapping action more concise and smooth.

[0210] According to some embodiments of the present application, optionally, as Figure 6 、 Figure 7 and Figure 9 shown, the main wrapping mechanism 332 includes two sets of pressing rollers 333 arranged side by side and spaced apart from each other. After the first one 212a of the two end surfaces 212 of the electrode driving mechanism 331 contacts the connection area 420, the electrode assembly 200 and the head-end wrapping film 409 are sent between the two sets of pressing rollers 333. The two sets of pressing rollers 333 drive the electrode assembly 200 in a rolling manner and press the two main wrapping areas 410 on the corresponding one of the two main surfaces 211 respectively.

[0211] The distance between the two sets of pressing rollers 333 matches the distance between the two main surfaces 211 of the electrode assembly 200. During the process of the electrode assembly 200 and the head-end wrapping film 409 entering between the two sets of pressing rollers 333, the two sets of pressing rollers 333 can limit the two main wrapping areas 410, so that the two main wrapping areas 410 are respectively pressed on the corresponding one of the two main surfaces 211.

[0212] The set of pressing rollers 333 may include a plurality of pressing rollers 3331. The tangential direction of the pressing roller 3331 at the contact position with the electrode assembly 200 is parallel to the second direction D2, so that the pressing roller 3331 drives the electrode assembly 200 to move along the second direction D2 by rolling.

[0213] With such an arrangement, during the process of the wrapping film 400 wrapping the two main surfaces 211, the arrangement and use of the manipulator can be reduced, the complexity of the action of the wrapping device 300 pressing the two main wrapping areas 410 on the two main surfaces 211 respectively can be simplified, and it is convenient to maintain the wrapping device 300.

[0214] In some embodiments, the electrode driving mechanism 331 is configured to convey the electrode assembly 200 between the two pressure roller groups 333 along the second direction D2, and at the same time, the rotation speed of the pressure roller 3331 matches the speed at which the electrode driving mechanism 331 conveys the electrode assembly 200 along the second direction D2, so as to reduce the resistance of the pressure roller group 333 to the movement of the electrode assembly 200 along the second direction D2.

[0215] According to some embodiments of the present application, optionally, as Figure 6 and Figure 9 shown, at least one of the two pressure roller groups 333 is configured to be floatingly arranged along the first direction D1. With such an arrangement, an adaptive adjustment of the distance between the two pressure roller groups 333 can be achieved, so that the distance between the two pressure roller groups 333 can better match the size of the electrode assembly 200 along the first direction D1, improving the covering effect.

[0216] Furthermore, at least one of the two pressure roller groups 333 is configured to be floating relative to the electrode assembly 200 between the two pressure roller groups 333 along the first direction D1. In some embodiments, at least one of the two pressure roller groups 333 floats along the first direction D1 through a floating cylinder. In some other embodiments, at least one of the two pressure roller groups 333 floats along the first direction D1 through a spring 3321. For example, the main surface covering mechanism 332 includes a spring 3321, a guide post 3322, a fixed bracket 3323, and a floating bracket 3324. At least one of the two pressure roller groups 333 is arranged on the floating bracket 3324. The guide post 3322 extends along the first direction D1. The spring 3321 is sleeved on the guide post 3322 and abuts between the fixed bracket 3323 and the floating bracket 3324. The fixed bracket 3323 and the floating bracket 3324 are slidably connected through the guide post 3322.

[0217] According to some embodiments of the present application, optionally, as Figure 6 and Figure 9 shown, one of the two pressure roller groups 333 is an active pressure roller group 333, or the two pressure roller groups 333 are respectively active pressure roller groups 333, and the movement direction D8 of the contact point of the active pressure roller group 333 with the main surface 211 is the same as the movement direction D9 of the electrode driving mechanism 331.

[0218] With such an arrangement, the resistance of the pressure roller group 333 to the movement of the electrode assembly 200 along the second direction D2 can be reduced, and the movement stability of the electrode assembly 200 and the first-end covering film 409 entering between the two pressure roller groups 333 can be improved.

[0219] According to some embodiments of the present application, optionally, as Figure 6 and Figure 7As shown, the first covering assembly 330 further includes a first film positioning mechanism 334 and a second film positioning mechanism 335. The first film positioning mechanism 334 is used to position one end of the leading-end covering film 409 facing the feeding assembly 310, and the second film positioning mechanism 335 is used to position the other end of the leading-end covering film 409 away from the feeding assembly 310, so that before the first of the two end faces 212, i.e., 212a, contacts the connection area 420, the connection area 420 of the leading-end covering film 409 and the two main covering areas 410 are coplanar with each other, and the second direction D2 is perpendicular to the plane where the connection area 420 is located.

[0220] For example, the distance between the first film positioning mechanism 334 and the second film positioning mechanism 335 can be set so that the leading-end covering film 409 can be stretched, so that the connection area 420 and the two main covering areas 410 are coplanar with each other. By setting the connection area 420 and the two main covering areas 410 to be coplanar with each other, the two main covering areas 410 will not block the connection area 420, which can reduce the interference of the two main covering areas 410 on the process of the first of the two end faces 212, i.e., 212a, contacting the connection area 420, thereby improving the covering efficiency and covering effect.

[0221] Optionally, the second film positioning mechanism 335 positions the other end of the leading-end covering film 409 away from the feeding assembly 310 by clamping.

[0222] According to some embodiments of the present application, optionally, as Figure 6 shown, the first covering assembly 330 further includes a third film positioning mechanism 336. The third film positioning mechanism 336 is located on the side of the first film positioning mechanism 334 facing the feeding assembly 310 and is used to position the subsequent covering film 411 adjacent to the leading-end covering film 409. The cutting assembly 320 cuts the strip 401 between the first film positioning mechanism 334 and the third film positioning mechanism 336.

[0223] Specifically, the released part of the strip 401 may include the leading-end covering film 409 and at least part of the subsequent covering film 411. The cutting assembly 320 cuts the strip 401 at a preset position between the first film positioning mechanism 334 and the third film positioning mechanism 336. The preset position between the first film positioning mechanism 334 and the third film positioning mechanism 336 is the boundary line between the leading-end covering film 409 and the subsequent covering film 411. During the cutting process, the first film positioning mechanism 334 and the third film positioning mechanism 336 can position both sides of the preset position, thereby improving the stability of the cutting process and the cutting effect.

[0224] For example, the first film positioning mechanism 334 and the third film positioning mechanism 336 can respectively perform clamping and positioning on both sides of a preset position. Another example is that the first film positioning mechanism 334 includes two first rollers 3341, and one side of the preset position far from the feeding assembly 310 can be clamped between the two first rollers 3341. When the first rollers 3341 rotate, they can convey the released part of the tape 401 towards the third film positioning mechanism 336, so that the released part of the tape 401 can reach the third film positioning mechanism 336. The third film positioning mechanism 336 respectively includes two second rollers 3361, and one side of the preset position close to the feeding assembly 310 can be clamped between the two second rollers 3361. When the second rollers 3361 rotate, they can convey the released part of the tape 401 towards the first film positioning mechanism 334, so that the released part of the tape 401 can reach the first film positioning mechanism 334.

[0225] According to some embodiments of the present application, optionally, as Figure 6 shown, the third film positioning mechanism 336 is further configured to feed the subsequent covering film 411 into the first film positioning mechanism 334 and the second film positioning mechanism 335 after the head covering film 409 is cut off from the tape 401.

[0226] With such a setting, the feeding of the covering film 400 can be continuously connected between different positions, improving the stability of the covering process.

[0227] For example, the third film positioning mechanism 336 respectively includes two second rollers 3361, and one end of the subsequent covering film 411 far from the feeding assembly 310 can be clamped between the two second rollers 3361. When the two second rollers 3361 rotate, they can drive the subsequent covering film 411 to move towards the first film positioning mechanism 334 and the second film positioning mechanism 335, so that the subsequent covering film 411 sequentially enters between the first film positioning mechanism 334 and the second film positioning mechanism 335.

[0228] According to some embodiments of the present application, optionally, as Figures 6 to 8 shown, the electrode assembly 200 further includes a pole ear part 201 protruding from the first one 212a of the two end faces 212. An opening 421 is provided on the connection area 420, and the first covering assembly 330 is configured such that the pole ear part 201 passes through the opening 421.

[0229] Due to the existence of the pole ear part 201, the difficulty of covering the first one 212a of the two end faces 212 with the covering film 400 is increased. By providing an opening 421 on the connection area 420, the opening 421 can form an avoidance for the pole ear part 201, which can reduce the interference of the pole ear part 201 on the covering process, thereby improving the covering effect of the covering film 400 on the first one 212a of the two end faces 212.

[0230] After the tab portion 201 passes through the opening 421, the tab portion 201 can limit the connection area 420, thereby reducing the risk of the encapsulation film 400 sliding and shifting relative to the electrode assembly 200.

[0231] When the electrode assembly 200 is installed in the housing 100, the tab portion 201 and the opening of the housing 100 can be first arranged opposite and spaced apart in the second direction D2, and then the electrode assembly 200 is moved toward the housing 100 in the second direction D2, so that the tab portion 201 and the first one 212a of the two end faces 212 enter the housing 100 in sequence. The connection area 420 and the main encapsulation 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 installation of the electrode assembly 200 into the housing 100, and being beneficial to improving the assembly efficiency and assembly effect.

[0232] Furthermore, 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 encapsulation device 300 controls the encapsulation film 400 to encapsulate the first one 212a of the two end faces 212 earlier than the encapsulation device 300 controls the encapsulation film 400 to encapsulate the second one 212b of the two end faces 212 of the electrode body 210, the two main surfaces 211, and the two side surfaces 213 of the electrode body 210. During the process of the encapsulation film 400 encapsulating the electrode body 210, it is necessary to fix the edge of the encapsulation film 400 so that the encapsulation film 400 can be fixed on the electrode body 210. The encapsulation device 300 controlling the encapsulation film 400 to first encapsulate the first one 212a of the two end faces 212 can make the edge of the encapsulation 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 of the edge of the encapsulation film 400, improving the encapsulation effect of the encapsulation film 400 on the electrode body 210. In addition, the edge of the encapsulation film 400 falls outside the first one 212a of the two end faces 212, which can reduce the risk of the edge of the encapsulation film 400 being 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 installation of the electrode assembly 200 into the housing 100.

[0233] According to some embodiments of the present application, optionally, as Figure 6As shown, the feeding assembly 310 includes two feeding mechanisms 311, each feeding mechanism 311 stores and releases a tape 401 respectively. Among them, the tape 401 corresponding to the first of the two feeding mechanisms 311 serves as the working tape 402 and is fed into the first covering assembly 330. The tape 401 corresponding to the second of the two feeding mechanisms 311 serves as the spare tape 405. The covering device 300 further includes a switching assembly 340, and the switching assembly 340 is used to fix the spare tape 405 to the working tape 402 so that the spare tape 405 is fed into the first covering assembly 330 under the movement of the working tape 402.

[0234] Specifically, when the tape roll serving as the working tape 402 is about to finish releasing the tape 401, the switching assembly 340 can fix the released part of the tape 401 serving as the spare tape 405 to the working tape 402, so that the spare tape 405 takes over the working tape 402 to provide the covering film 400 for the first covering assembly 330. That is to say, the spare tape 405 becomes the new working tape 402, and the place where the original working tape 402 was placed can be loaded with the tape 401 to place a new tape 401, and the newly placed tape 401 serves as the new spare tape 405.

[0235] With such a setting, when the working tape 402 is about to be released completely, the covering film 400 on the spare tape 405 can be automatically fed into the first covering assembly 330 without stopping the machine to change the roll, realizing continuous supply of the covering film 400 to the first covering assembly 330 and improving the covering efficiency of the covering device 300.

[0236] According to some embodiments of the present application, optionally, as Figures 10 to 12 shown, the switching assembly 340 includes two pressing mechanisms 341 and a tape cutting mechanism 342. The two pressing mechanisms 341 cooperate with each other to clamp the working tape 402 and the spare tape 405 from both sides of the working tape 402 and the spare tape 405. The tape cutting mechanism 342 cuts off the working tape 402 and the spare tape 405 in the clamped state, so that the working tape 402 and the spare tape 405 respectively form an upstream part and a downstream part located upstream and downstream of the cutting position of the tape cutting mechanism 342. The two pressing mechanisms 341 connect the downstream part 403 of the working tape 402 with the upstream part 407 of the spare tape 405.

[0237] Two pressing mechanisms 341 connect the downstream part 403 of the working tape 402 with the upstream part 407 of the spare tape 405, so that the spare tape 405 is fixed to the working tape 402. Before the two pressing mechanisms 341 cooperate with each other to clamp the working tape 402 and the spare tape 405, a part of the released part of the working tape 402 and a part of the released part of the spare tape 405 are set to be between the two pressing mechanisms 341, and the two pressing mechanisms 341 approach each other so as to be able to clamp the working tape 402 and the spare tape 405 from both sides of the working tape 402 and the spare tape 405.

[0238] The two pressing mechanisms 341 can be the same or different. The installation positions of the two pressing mechanisms 341 correspond to the two feeding mechanisms 311 respectively. When the tapes 401 corresponding to the two feeding mechanisms 311 are switched between the working tape 402 and the spare tape 405, the actions of the two pressing mechanisms 341 to connect the downstream part 403 of the working tape 402 with the upstream part 407 of the spare tape 405 will also be interchanged.

[0239] The cutting position of the tape cutting mechanism 342 for the working tape 402 and the spare tape 405 is located at the part of the working tape 402 and the spare tape 405 clamped by the two pressing mechanisms 341. Correspondingly, the tape cutting mechanism 342 can be arranged inside one of the pressing mechanisms 341.

[0240] The downstream part 403 of the working tape 402 is the part of the working tape 402 close to the first covering assembly 330 from the cutting position, and the upstream part 407 of the spare tape 405 is the part of the spare tape 405 away from the first covering assembly 330 from the cutting position. After the downstream part 403 of the working tape 402 is connected to the upstream part 407 of the spare tape 405, the upstream part 407 of the spare tape 405 can replace the upstream part 404 of the working tape 402 to provide the covering film 400 for the first covering assembly 330.

[0241] With such a setting, when the working tape 402 is about to be released completely, the covering film 400 on the spare tape 405 can be automatically sent to the first covering assembly 330 to replace the working tape 402 without stopping the machine for roll change, so as to continuously provide the covering film 400 for the first covering assembly 330 and improve the covering efficiency.

[0242] Further, the leading end of the working strip 402 extends to the first covering assembly 330. Along the extending direction of the releasing portion of the working strip 402, two pressing mechanisms 341 and a strip cutting mechanism 342 are disposed between the first covering assembly 330 and the strip feeding assembly 310. The switching assembly 340 further includes a strip receiving mechanism 312, and the releasing portion of the spare strip 405 can pass through between the two pressing mechanisms 341 and further extend to be connected to the strip receiving mechanism 312.

[0243] According to some embodiments of the present application, optionally, as Figures 10 to 12 shown, the two pressing mechanisms 341 respectively include pressing members 3411, and at least one of the two pressing mechanisms 341 includes a pressing driving member 3412. The pressing member 3411 includes a first pressing area 3414 and a second pressing area 3415 spaced by a slot 3413. The pressing driving member 3412 drives at least one pressing member 3411 so that the two first pressing areas 3414 cooperate with each other to clamp the working strip 402 and the spare strip 405, and the two second pressing areas 3415 cooperate with each other to clamp the working strip 402 and the spare strip 405. The strip cutting mechanism 342 includes a cutter 3421, and the cutter 3421 is telescopically disposed in the slot 3413 of the first one of the two pressing members 3411 and extends into the slot 3413 of the second one of the two pressing members 3411 in the clamping state, thereby cutting the working strip 402 and the spare strip 405.

[0244] The two first pressing areas 3414 and the two second pressing areas 3415 can simultaneously clamp the working strip 402 and the spare strip 405 to facilitate the cutting by the cutter 3421. With one cutting action of the cutter 3421, the working strip 402 and the spare strip 405 can be respectively cut into two parts. With such a setting, the cutting efficiency can be improved and the cutting structure can be simplified.

[0245] According to some embodiments of the present application, optionally, as Figures 10 to 12 shown, the strip cutting mechanism 342 includes an elastic member 3422, and the elastic member 3422 is arranged to elastically support the first one of the two pressing members 3411 so that the first one of the two pressing members 3411 elastically retracts in the clamping state, thereby causing the cutter 3421 to extend out of the slot 3413 of the first one of the two pressing members 3411.

[0246] Specifically, the switching component 340 further includes a support bracket 3423. An elastic member 3422 is elastically supported between the first of the two pressing members 3411 and the support bracket 3423. The cutting knife 3421 is fixedly arranged relative to the support bracket 3423. When the two pressing members 3411 are abutted and pressed against each other, the elastic member 3422 can be contracted, so that relative movement is generated between the first of the two pressing members 3411 and the cutting knife 3421. When the two pressing members 3411 are abutted and pressed against each other, they remain relatively stationary, and the cutting knife 3421 can extend into the slot 3413 of the second of the two pressing members 3411 from the slot 3413 of the first of the two pressing members 3411.

[0247] With such an arrangement, there is no need to provide a specific power device to drive the cutting knife 3421 to move relative to the two pressing members 3411, which can simplify the cutting structure.

[0248] According to some embodiments of the present application, optionally, as Figure 6 and Figure 10 shown, the first of the two pressing mechanisms 341 is arranged to simultaneously adsorb the downstream portion 403 of the working tape 402 and the upstream portion 407 of the spare tape 405, and the second of the two pressing mechanisms 341 is arranged to apply a connecting tape at the joint position of the downstream portion 403 of the working tape 402 and the upstream portion 407 of the spare tape 405.

[0249] For example, the first of the two pressing mechanisms 341 can adsorb the downstream portion 403 of the working tape 402 and the upstream portion 407 of the spare tape 405 by means of electrostatic adsorption or vacuum negative pressure adsorption.

[0250] With such an arrangement, the connection efficiency between the downstream portion 403 of the working tape 402 and the upstream portion 407 of the spare tape 405 can be improved. By arranging the first of the two pressing mechanisms 341 to simultaneously adsorb the downstream portion 403 of the working tape 402 and the upstream portion 407 of the spare tape 405, the stability of the joining process can be improved.

[0251] After the two pressing mechanisms 341 move away from each other to release the clamping of the working strip 402 and the spare strip 405, the upstream portion 404 of the working strip 402 and the downstream portion 406 of the spare strip 405 can be moved out between the two pressing mechanisms 341. Then, the two pressing mechanisms 341 move closer to each other and clamp the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405. Further, the first of the two pressing mechanisms 341 is set to simultaneously adsorb the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405. Then, the two pressing mechanisms 341 move away from each other, and the second of the two pressing mechanisms 341 applies a connecting tape at the joint position of the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405.

[0252] According to some embodiments of the present application, optionally, as Figure 6 , Figures 10 to 12 shown, the two pressing mechanisms 341 respectively include pressing members 3411. The pressing member 3411 of the first of the two pressing mechanisms 341 is set to simultaneously adsorb the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405. The second of the two pressing mechanisms 341 includes a pressing driving member 3412, a rotating driving member 3417, and a tape pasting member 3418. The tape pasting member 3418 is set to carry the connecting tape, and the rotating driving member 3417 is set to be able to rotationally drive the tape pasting member 3418 and the pressing member 3411 of the second of the two pressing mechanisms 341 to switch between a first state and a second state. In the first state, the pressing members 3411 of the two pressing mechanisms 341 are arranged opposite to each other. In the second state, the tape pasting member 3418 is arranged opposite to the pressing member 3411 of the first of the two pressing mechanisms 341. The pressing driving member 3412 is set to drive the pressing members 3411 of the two pressing mechanisms 341 to press against each other in the first state, and to drive the tape pasting member 3418 and the pressing member 3411 of the first of the two pressing mechanisms 341 to press against each other in the second state.

[0253] With such a setting, the movement stability of the pressing member 3411 and the tape pasting member 3418 can be improved, and the cutting effect and the connection effect of the connecting tape can be enhanced.

[0254] Optionally, each of the two pressing mechanisms 341 includes a pressing member 3411. The pressing member 3411 of the second one of the two pressing mechanisms 341 is configured to simultaneously adsorb the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405. The first one of the two pressing mechanisms 341 includes a pressing driving member 3412, a rotating driving member 3417, and an adhesive attaching member 3418. The adhesive attaching member 3418 is configured to carry the connecting tape. The rotating driving member 3417 is configured to be able to rotationally drive the adhesive attaching member 3418 and the pressing member 3411 of the first one of the two pressing mechanisms 341 to switch between a first state and a second state. In the first state, the pressing members 3411 of the two pressing mechanisms 341 are arranged opposite to each other. In the second state, the adhesive attaching member 3418 is arranged opposite to the pressing member 3411 of the second one of the two pressing mechanisms 341. The pressing driving member 3412 is configured to drive the pressing members 3411 of the two pressing mechanisms 341 to press against each other in the first state, and to drive the adhesive attaching member 3418 and the pressing member 3411 of the second one of the two pressing mechanisms 341 to press against each other in the second state.

[0255] According to some embodiments of the present application, optionally, as Figure 6 shown, the unwinding assembly 310 corresponding to the working strip 402 is further configured to collect the upstream portion 404 of the working strip 402. The switching assembly 340 further includes a winding mechanism 312 for winding the downstream portion 406 of the spare strip 405.

[0256] The unwinding assembly 310 can move in a direction opposite to the direction of releasing the strip 401, so as to collect the upstream portion 404 of the working strip 402. For example, the unwinding assembly 310 can rotate the strip 401 on the releasing strip roll, and the unwinding assembly 310 can also rotate the strip 401 on the collecting strip roll in the opposite direction.

[0257] One end of the downstream portion 406 of the spare strip 405 away from the unwinding assembly 310 can be connected to the winding mechanism 312, so that the winding mechanism 312 can wind the downstream portion 406 of the spare strip 405 through movement. For example, the winding mechanism 312 includes a roller, and one end of the downstream portion 406 of the spare strip 405 away from the unwinding assembly 310 can be wound and connected to the roller, and the roller can wind the downstream portion 406 of the spare strip 405 by rotating.

[0258] With such an arrangement, the automation degree of the coating device 300 can be improved.

[0259] According to some embodiments of the present application, optionally, as Figure 6 、 Figures 10 to 12As shown, during the process of collecting the upstream portion 404 of the working strip 402 and the downstream portion 406 of the spare strip 405, the two pressing mechanisms 341 are in a separated state. The two pressing mechanisms 341 are also configured to respectively adsorb the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405, and after the upstream portion 404 of the working strip 402 and the downstream portion 406 of the spare strip 405 are collected, transfer the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405 to the first of the two pressing mechanisms 341.

[0260] After the working strip 402 and the spare strip 405 are cut off from the cutting position, the two pressing mechanisms 341 can respectively adsorb the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405 and move away from each other, so that after the two pressing mechanisms 341 release the clamping of the working strip 402 and the spare strip 405, the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405 will not loosen and misalign relative to the joint position, thereby improving the accuracy of connecting the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405.

[0261] According to some embodiments of the present application, optionally, as Figure 6 、 Figures 10 to 12 shown, the two pressing mechanisms 341 respectively include pressing members 3411, and at least one of the two pressing mechanisms 341 includes a pressing driving member 3412. The pressing member 3411 includes a first pressing area 3414 and a second pressing area 3415 that are spaced apart from each other. The pressing driving member 3412 drives at least one pressing member 3411 so that the two first pressing areas 3414 cooperate with each other to clamp the working strip 402 and the spare strip 405, and the two second pressing areas 3415 cooperate with each other to clamp the working strip 402 and the spare strip 405. The strip cutting mechanism 342 cuts the working strip 402 and the spare strip 405 in the interval area between the first pressing area 3414 and the second pressing area 3415. After the cutting is completed, the pressing driving member 3412 drives the two pressing members 3411 to separate from each other. The two pressing members 3411 respectively adsorb the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405, and after the upstream portion 404 of the working strip 402 and the downstream portion 406 of the spare strip 405 are collected, the pressing driving member 3412 drives the two pressing members 3411 to separate from each other, and the first of the two pressing mechanisms 341 simultaneously adsorbs the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405.

[0262] With such a setting, the downstream part 403 of the working strip 402 and the upstream part 407 of the spare strip 405 can be stably positioned, facilitating the connection of the downstream part 403 of the working strip 402 and the upstream part 407 of the spare strip 405.

[0263] According to some embodiments of the present application, optionally, as Figure 6 and Figure 13 shown, the coating device 300 further includes a positioning assembly 350, and the positioning assembly 350 is configured to clamp and fix the electrode coating body 240 output by the first coating assembly 330 from the outside of the two main coating areas 410.

[0264] By setting the positioning assembly 350 to replace the first coating assembly 330 to position the electrode assembly 200, the electrode coating body 240 can be stably separated from the first coating assembly 330. By setting the positioning assembly 350 to clamp and fix the electrode coating body 240 output by the first coating assembly 330 from the outside of the two main coating areas 410, the positioning assembly 350 can avoid the second 212b of the side surface 213, the side coating area 430, the two end surfaces 212 and the end coating area 440, reducing the interference of the positioning assembly 350 on the subsequent coating process.

[0265] Optionally, as Figure 13 shown, the positioning assembly 350 includes a moving bracket 351, a rotary positioning motor, a cylinder and a clamping arm 352. The cylinder can drive the two clamping arms 352 to clamp the second coating assembly 370. The clamping arm 352 can be rotatably connected to the moving bracket 351, and the rotary positioning motor can drive the clamping arm 352 to rotate relative to the moving bracket 351, thereby driving the electrode coating body 240 to rotate. For example, at the initial stage when the electrode coating body 240 is clamped by the clamping arms 352, the moving direction of the electrode coating body 240 entering between the two clamping arms 352 can be parallel to the second direction D2 of the electrode coating body 240, and then the rotary positioning motor can drive the clamping arm 352 to rotate 90°, so that the second direction D2 of the electrode coating body 240 is perpendicular to the moving direction of the electrode coating body 240 entering between the two clamping arms 352.

[0266] According to some embodiments of the present application, optionally, as Figure 5 、 Figure 7 and Figure 13 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. The positioning assembly 350 conveys the electrode coating body 240 to the second coating assembly 370, and the second coating assembly 370 is configured to drive the side coating area 430 to contact and coat on the side surface 213.

[0267] The positioning component 350 can play a transportation role to drive the electrode wrapper 240 closer to the second wrapping component 370, facilitating the second wrapping component 370 to wrap the side wrapping area 430 around the side surface 213. The second wrapping component 370 can drive the side wrapping area 430 to move towards the side surface 213, enabling the side wrapping area 430 to gradually contact and wrap around the side surface 213.

[0268] The second wrapping component 370 can adjust the relative positional relationship between the electrode component 200 and the side wrapping area 430. By arranging the second wrapping component 370 to wrap the side wrapping area 430 around the side surface 213, the wrapping effect of the wrapping film 400 on the electrode body 210 can be improved.

[0269] According to some embodiments of the present application, optionally, as Figures 14 to 17 shown, the second wrapping component 370 includes a side pressing plate 371, a first pressing plate driving mechanism 372, and a second pressing plate driving mechanism 373. The first pressing plate driving mechanism 372 is used to drive the side pressing plate 371 along the first direction D1, so that the side pressing plate 371 pushes the side wrapping area 430 to bend relative to the main wrapping 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 wrapping area 430 against the side surface 213.

[0270] After the main wrapping area 410 is wrapped around the main surface 211 of the electrode body 210, the side wrapping area 430 and the main wrapping area 410 can be coplanar or approximately coplanar. The movement of the side pressing plate 371 along the first direction D1 can push the side wrapping area 430 to bend relative to the main wrapping area 410. During the bending process of the side wrapping area 430 relative to the main wrapping area 410, it gradually approaches the side surface 213 of the electrode body 210. After the side pressing plate 371 pushes the side wrapping area 430 to bend relative to the main wrapping area 410 towards the side surface 213, in the third direction D3, the side pressing plate 371 and the side surface 213 of the electrode body 210 can be opposite and spaced apart, and the side wrapping area 430 is located between the side pressing plate 371 and the side surface 213 of the electrode body 210. At this time, the movement of the side pressing plate 371 along the third direction D3 towards the electrode body 210 can press the side wrapping area 430 against the side surface 213 of the electrode body 210, causing the side wrapping area 430 to form a wrap around the side surface 213 of the electrode body 210.

[0271] With such an arrangement, the actions of the second wrapping component 370 to bend the side wrapping area 430 and to wrap the side wrapping area 430 around the side surface 213 can be smoothly connected, which is beneficial to simplifying the actions and structure of the second wrapping component 370 and improving the wrapping efficiency.

[0272] Optionally, as Figures 14 to 17As shown, two side covering areas 430 can be connected to each main covering area 410. The two side covering areas 430 connected to the first of the two main covering areas 410 can be denoted as B1 and B2, and the two side covering areas 430 connected to the second of the two main covering areas 410 can be denoted as B3 and B4. The second covering 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 can 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.

[0273] 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.

[0274] Before C1 and C2 move along the third direction D3 respectively, C1 and C2 are spaced and oppositely arranged with the two side surfaces 213 respectively. B1 is located between C1 and one side surface 213, and B2 is located between C2 and the other side surface 213. The 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 and oppositely arranged with the two side surfaces 213 respectively. B3 is located between C3 and one side surface 213, and B4 is located between C4 and the other side surface 213. The 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.

[0275] 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.

[0276] According to some embodiments of the present application, optionally, as Figures 14 to 17 shown, the covering film 400 includes an end covering area 440 connected to the main covering area 410, and the second covering assembly 370 is arranged to drive the end covering area 440 to contact and cover the second end surface 212b of the two end surfaces 212.

[0277] 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 end surface 212b of the two end surfaces 212, the covering effect of the covering film 400 on the electrode body 210 can be improved.

[0278] According to some embodiments of the present application, optionally, as Figures 14 to 17 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 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 toward the second end surface 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 on the second end surface 212b of the two end surfaces 212.

[0279] After the main wrapping area 410 wraps the main surface 211 of the electrode body 210, the end wrapping area 440 and the main wrapping area 410 can be coplanar or approximately coplanar. The end surface pressing plate 374 moving along the first direction D1 can push the end wrapping area 440 to bend relative to the main wrapping area 410, and the end wrapping area 440 gradually approaches the second one 212b of the two end surfaces 212 during the bending process relative to the main wrapping area 410. After the end surface pressing plate 374 pushes the end wrapping area 440 to bend relative to the main wrapping area 410 towards the second one 212b of the two end surfaces 212, the end surface pressing plate 374 and the second one 212b of the two end surfaces 212 can be relatively and spaced apart in the second direction D2, and the end wrapping area 440 is located between the end surface pressing plate 374 and the second one 212b of the two end surfaces 212. At this time, the end surface pressing plate 374 moving close to the electrode body 210 along the second direction D2 can press the end wrapping area 440 against the second one 212b of the two end surfaces 212, so that the end wrapping area 440 forms a wrap on the second one 212b of the two end surfaces 212.

[0280] Optionally, as Figures 14 to 17 shown, each main wrapping area 410 is connected to an end wrapping area 440, and the second wrapping assembly 370 includes two end surface pressing plates 374. The two end surface pressing plates 374 moving along the first direction D1 respectively can make the two end surface pressing plates 374 approach each other, and further can make the two end wrapping areas 440 bend towards the second one 212b of the two end surfaces 212 respectively. The two end surface pressing plates 374 moving along the second direction D2 respectively can make the two end wrapping areas 440 cover on the second one 212b of the two end surfaces 212 respectively.

[0281] In some embodiments, the two end wrapping areas 440 can overlap each other and partially overlap. One of the two end surface pressing plates 374 can first bend an end wrapping area 440 towards the second one 212b of the two end surfaces 212 and press it against the second one 212b of the two end surfaces 212, and the other of the two end surface pressing plates 374 can then bend the other end wrapping area 440 towards the second one 212b of the two end surfaces 212 and press it against the second one 212b of the two end surfaces 212.

[0282] 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 along the second direction D2, and the first platen cylinder 376 is configured to provide power for driving the side platen 371 along the third direction D3. In other embodiments, the second platen transmission mechanism 373 and the third platen transmission mechanism 375 may 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 along the second direction D2 and the side platen 371 along the third direction D3, such that while the side platen 371 moves toward the side covering area 430 along the third direction D3, the end platen 374 moves toward the end covering area 440 along the second direction D2. Thus, the covering time can be reduced and the covering efficiency can be improved.

[0283] 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 along 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 along the first direction D1, it can synchronously drive the third platen transmission mechanism 375 along the first direction D1, and when the first platen transmission mechanism 372 drives the side platen 371 along the first direction D1, it can synchronously drive the second platen transmission mechanism 373 along the first direction D1.

[0284] Optionally, as Figures 14 to 17 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 along 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 along the first direction D1.

[0285] Optionally, as Figures 14 to 17 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 along 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 along 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 may be disposed on the second platen bracket 379 and move synchronously along the first direction D1 with the second platen bracket 379.

[0286] Further, the first pressing plate bracket 378 and the second pressing plate bracket 379 are relatively fixedly arranged.

[0287] Optionally, as Figures 14 to 17 shown, an end limiting block 3741 with an adjustable position is arranged on the end face pressing plate 374. The end 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 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 limiting block 3741, so as to improve the fitting degree with the main wrapping area 410.

[0288] Optionally, as Figures 14 to 17 shown, a side limiting block 3711 with an adjustable position is arranged on the side face pressing plate 371. The side 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 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 limiting block 3711, so as to improve the fitting degree with the main wrapping area 410.

[0289] According to some embodiments of the present application, optionally, as Figures 14 to 17 shown, the first pressing plate transmission mechanism 372 includes a pressing plate driving motor 377, a first pressing plate bracket 378, and a second pressing plate bracket 379. The pressing plate driving motor 377 is arranged on the first pressing plate bracket 378 and drives the second pressing plate bracket 379 to move relative to the first pressing plate bracket 378. The second 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.

[0290] With such an arrangement, the 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.

[0291] According to some embodiments of the present application, optionally, as Figure 5 、 Figure 7 、 Figure 8 and Figure 18As 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. The first tape attaching 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 attaching assembly 380 is arranged to attach the first part 511 of the first tape 510 to the side coating area 430 and attach 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.

[0292] 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.

[0293] Specifically, after pressing the end coating area 440 and the side coating area 430 on 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 arranged opposite to each other. Then the first tape attaching assembly 380 drives the electrode assembly 200 to continue to move, 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 adheres to the end coating area 440.

[0294] 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 arranged opposite to each other. Then the first tape attaching assembly 380 drives the electrode assembly 200 to continue to move, 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 adheres to the side coating area 430.

[0295] Further, the side wrapping regions 430 respectively connected to the two main wrapping regions 410 jointly wrap the same side surface 213 of the electrode body 210, and the first tape 510 can function to connect the two side wrapping regions 430 wrapping the same side surface 213 of the electrode body 210. The end wrapping regions 440 respectively connected to the two main wrapping regions 410 jointly wrap the second one 212b of the two end surfaces 212, and the first tape 510 can function to connect the two end wrapping regions 440 wrapping the second one 212b of the two end surfaces 212.

[0296] Optionally, as Figures 19 to 24 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 for clamping and pulling the leading end of the releasing portion of the first tape roll 384, the first cutting mechanism 383 is used for cutting the first tape 510 from the releasing portion of the first tape roll 384, and the first glue taking mechanism 386 is used for sucking the first tape 510 and attaching it onto the wrapping film 400.

[0297] Optionally, as Figures 19 to 24 shown, the first tape attaching assembly 380 further includes a first tape feeding mechanism 387, and the first tape feeding mechanism 387 is used for conveying the releasing 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 for conveying the releasing portion of the first tape roll 384.

[0298] According to some embodiments of the present application, optionally, as Figures 19 to 24 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 releasing portion of the first tape roll 384, and the first cutting mechanism 383 is configured to cut out the first tape 510 from the releasing portion of the first tape roll 384.

[0299] With such a setting, it is beneficial to realize the automatic supply of the first tape 510.

[0300] According to some embodiments of the present application, optionally, as Figures 19 to 24 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 for driving the first glue clamping member 3823 to clamp the leading end of the releasing portion, and the first glue pulling motor 3822 is used for driving the first glue clamping member 3823 to move to pull the releasing portion.

[0301] 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.

[0302] According to some embodiments of the present application, optionally, as Figures 19 to 24 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.

[0303] 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°.

[0304] According to some embodiments of the present application, optionally, as Figures 19 to 24 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 onto the first glue taking mechanism 386 and drive the first cutting knife 3832 to cut out the first tape 510 from the release part.

[0305] 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.

[0306] According to some embodiments of the present application, optionally, as Figures 19 to 24As shown, the first tape attaching assembly 380 includes a first glue picking mechanism 386 for adsorbing and picking up the first tape 510. The first glue picking mechanism 386 includes a first glue picking member 3861, a first glue picking motor 3862, a second glue picking motor 3863, a first glue picking support 3864, and a second glue picking support 3865. The first glue picking member 3861 is used for adsorbing the first tape 510. The first glue picking motor 3862 is disposed on the first glue picking support 3864 and drives the second glue picking support 3865 to move above the release portion of the first tape roll 384. The second glue picking motor 3863 is disposed on the second glue picking support 3865 and drives the first glue picking member 3861 to approach and move away from the plane where the release portion of the first tape roll 384 is located.

[0307] With such an arrangement, the degree of freedom of movement of the first glue picking member 3861 can be improved, facilitating the picking and transferring of the first tape 510.

[0308] According to some embodiments of the present application, optionally, as Figures 19 to 24 shown, the first glue picking member 3861 includes a first sub-glue picking portion 3866 and a second sub-glue picking portion 3867. The first sub-glue 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-glue 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.

[0309] With such an arrangement, the coherence of the glue picking action and the glue attaching action can be improved.

[0310] Optionally, at least one of the first sub-glue picking portion 3866 and the second sub-glue picking portion 3867 has an adsorption surface for contacting and adsorbing the first tape 510, and the first sub-glue picking portion 3866 and the second sub-glue 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 glue picking member 3861 can be bent. For example, one of the first sub-glue picking portion 3866 and the second sub-glue picking portion 3867 can be driven to move in a direction perpendicular to the adsorption surface.

[0311] According to some embodiments of the present application, optionally, as Figures 19 to 24As shown, the first sub glue-taking part 3866 is a telescopic member. The second glue-taking motor 3863 drives the first glue-taking member 3861 along the third direction D3. The first sub glue-taking part 3866 presses and holds the first part 511 of the first tape 510 on the side covering area 430 and contracts, so that the second sub glue-taking part 3867 can continue to move along the third direction D3 and fit the end covering area 440, and then attach the second part 512 of the first tape 510 to the end covering area 440. Alternatively, the second sub glue-taking part 3867 is a telescopic member. The second glue-taking motor 3863 drives the first glue-taking member 3861 along the second direction D2. The second sub glue-taking part 3867 presses and holds the second part 512 of the first tape 510 on the end covering area 440 and contracts, so that the first sub glue-taking part 3866 can continue to move along the second direction D2 and fit the side covering area 430, and then attach the first part 511 of the first tape 510 to the side covering area 430.

[0312] The telescopic member can be telescoped. For example, the telescopic member has elasticity, can be elastically telescoped, and is telescoped under pressure.

[0313] With such a setting, the structural flexibility of the first glue-taking member 3861 can be improved, so that the first glue-taking member 3861 can adaptively adjust its shape according to the shape of the electrode body 210, thereby realizing diversified glue-pasting actions. Specifically, when the first sub glue-taking part 3866 and the second sub glue-taking part 3867 suck the first tape 510, the first tape 510 is in a flat shape. One of the first sub glue-taking part 3866 and the second sub glue-taking part 3867 is compressed, causing a dislocation between the first sub glue-taking part 3866 and the second sub glue-taking part 3867, so that the first tape 510 is bent, so as to be able to be attached to the end covering area 440 and the side covering area 430 at the same time.

[0314] According to some embodiments of the present application, optionally, as Figures 19 to 24As shown, the first cutting mechanism 383 is configured to cut out two first tapes 510 from the release portion. The number of the first tape picking members 3861 is two, and each adsorbs a corresponding first tape 510. The first tape attaching 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 tape picking mechanism 386 includes first tape picking members 3861, a first tape picking motor 3862, a second tape picking motor 3863, a first tape picking support 3864, a second tape picking support 3865, a third tape picking support 3868, and a tape separating cylinder 3869. The first tape picking members 3861 are used to adsorb 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 above the release portion of the first tape roll 384. The second tape picking motor 3863 is disposed on the second tape picking support 3865 and drives the third tape picking support 3868 and the two first tape picking members 3861 to approach and move away from the plane where the release portion of the first tape roll 384 is located. The tape separating cylinder 3869 is disposed on the third tape picking support 3868 and is configured to drive the two first tape picking members 3861 to move away from each other so that the two first tape picking members 3861 respectively correspond to two corners spaced apart along the third direction D3 of the electrode assembly 200.

[0315] For example, the first cutting mechanism 383 is correspondingly provided with two first cutting blades 3832 for the same release portion. 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.

[0316] With such a setting, the first tape picking mechanism 386 can adsorb and pick up the two first tapes 510 corresponding to each electrode assembly 200, and then realize attaching the two first tapes 510 correspondingly at two corners spaced apart along the third direction D3 of the electrode assembly 200, improving the tape attaching efficiency.

[0317] According to some embodiments of the present application, optionally, as Figure 5 、 Figure 7 、 Figure 8 and Figure 18 shown, the covering 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 configured to attach the first part 521 of the second tape 520 to the main covering area 410 and attach the second part 522 of the second tape 520 to the side covering area 430 at the corner formed by the side surface 213 and the main surface 211.

[0318] Before attaching the second tape 520, at least a portion 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.

[0319] 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 portion 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 portion 522 of the second tape 520, so that the second portion 522 of the second tape 520 gradually approaches and finally attaches to the side covering area 430.

[0320] Optionally, as Figures 25 to 31 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 portion 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.

[0321] Optionally, as Figures 25 to 31 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 portion 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 portion of the second tape roll 396.

[0322] According to some embodiments of the present application, optionally, as Figures 25 to 31 shown, the number of the first portions 521 of the second tape 520 is two, and they are located at both ends of the second portion 522 of the second tape 520. The second tape attaching assembly 390 is arranged to attach the two first portions of the second tape 520 to the corresponding one of the two main covering areas 410 respectively.

[0323] With such an arrangement, the contact area between the second tape 520 and the covering film 400 can be increased, and the fixing effect on the side covering area 430 can be improved.

[0324] 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.

[0325] According to some embodiments of the present application, optionally, as Figures 25 to 31 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.

[0326] With such a setting, it is beneficial to automatically provide the second tape 520.

[0327] According to some embodiments of the present application, optionally, as Figures 25 to 31 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.

[0328] 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.

[0329] According to some embodiments of the present application, optionally, as Figures 25 to 31 shown, the second unwinding mechanism 391 and the second cutting mechanism 393 are two corresponding sets and are spaced apart along the width direction D4 of the released portion. The second tape attaching assembly 390 includes a tape pulling support 394, a tape pulling position switching cylinder 3941, and a tape pulling position switching support 3942. The tape pulling position switching cylinder 3941 is disposed on the tape pulling support 394, and the second tape pulling mechanism 392 is disposed on the tape pulling position switching support 3942. The tape pulling position switching cylinder 3941 is configured to drive the tape pulling position switching support 3942 to move along the interval direction D5 between the two second unwinding mechanisms 391, so that the second tape pulling mechanism 392 can be switched between a standby position and a working position for the second tape pulling mechanism 392 to operate. One set of the second unwinding mechanism 391 and the second cutting mechanism 393 is provided at each of the standby position and the working position.

[0330] A second unwind mechanism 391 and a second cutting mechanism 393 can form a group. Two second unwind mechanisms 391 and two second cutting mechanisms 393 can correspondingly form two groups. By providing two groups of second unwind mechanisms 391 and second cutting mechanisms 393, the interference of the reel change operation of the second tape roll 396 on the tape pulling process can be reduced, and the tape pulling efficiency can be improved. Further, the two groups of second unwind mechanisms 391 and second cutting mechanisms 393 are arranged in layers in the height direction of the second tape attaching assembly 390.

[0331] By arranging the tape pulling position-changing cylinder 3941 to drive the tape pulling position-changing bracket 3942 to move along the interval direction D5 between the two second unwind mechanisms 391, the position of the tape pulling mechanism can correspond to the position of a group of second unwind mechanisms 391 and second cutting mechanisms 393 that are working, facilitating the tape pulling operation.

[0332] According to some embodiments of the present application, optionally, as Figures 25 to 31 shown, the second tape attaching assembly 390 includes a second tape picking mechanism 395 for adsorbing and picking up the second tape 520. The second cutting mechanism 393 includes a second pressing block 3931, a second cutter 3932, and a second cutting cylinder 3933. The second pressing block 3931 and the second cutter 3932 are relatively fixedly arranged. The second cutting cylinder 3933 is arranged 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 cutter 3932 to cut out the second tape 520 from the released portion of the second tape roll 396.

[0333] Providing 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.

[0334] According to some embodiments of the present application, optionally, as Figures 25 to 31 shown, the second tape attaching assembly 390 includes a second tape picking mechanism 395 for adsorbing and picking up the second tape 520. The second tape picking mechanism 395 includes a second tape picking member 3951, a fourth tape picking motor 3952, and a fourth tape picking bracket 3953. The second tape picking member 3951 is used for adsorbing the second tape 520. The fourth tape picking motor 3952 is arranged on the fourth tape picking bracket 3953 and drives the second tape picking member 3951 to move to be oppositely arranged along the thickness direction D6 of the released portion of the second tape roll 396 and drive 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.

[0335] With such an arrangement, the movement freedom of the second tape picking member 3951 can be improved, facilitating the picking and transferring of the second tape 520.

[0336] According to some embodiments of the present application, optionally, as Figures 25 to 31 shown, the second glue-taking member 3951 includes a third sub-glue-taking portion 3954 and a fourth sub-glue-taking portion 3955. The third sub-glue-taking portion 3954 is used to adsorb the first portion 521 of the second tape 520 and attach it to the main covering area 410. The fourth sub-glue-taking portion 3955 is used to adsorb the second portion 522 of the second tape 520 and attach it to the side covering area 430.

[0337] With such an arrangement, the coherence of the glue-taking action and the glue-attaching action can be improved.

[0338] Optionally, at least one of the third sub-glue-taking portion 3954 and the fourth sub-glue-taking portion 3955 has an adsorption surface for contacting and adsorbing the second tape 520, and the third sub-glue-taking portion 3954 and the fourth sub-glue-taking portion 3955 are arranged to be relatively movable in a direction perpendicular to the adsorption surface, so that the second tape 520 adsorbed on the second glue-taking member 3951 can be bent. For example, one of the third sub-glue-taking portion 3954 and the fourth sub-glue-taking portion 3955 can be driven to move in a direction perpendicular to the adsorption surface.

[0339] According to some embodiments of the present application, optionally, as Figures 25 to 31 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, and 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.

[0340] The telescopic member can be telescopic. For example, the telescopic member has elasticity and can be elastically telescoped.

[0341] With such an arrangement, the structural flexibility of the second glue-taking member 3951 can be improved, so that the second glue-taking member 3951 can adaptively adjust its shape according to the shape of the electrode body 210, thereby realizing diversified glue-attaching 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 to cause misalignment between the first sub-glue-taking portion 3866 and the second sub-glue-taking portion 3867, so that the second tape 520 is bent to be able to be attached to the main covering area 410 and the side covering area 430 at the same time. Further, the fourth sub-glue-taking portion 3955 is located between two third sub-glue-taking portions 3954. During glue attachment, both third sub-glue-taking portions 3954 can be misaligned with the fourth sub-glue-taking portion 3955, so that the second tape 520 can be attached to the two main covering areas 410 and the side covering area 430 at the same time.

[0342] According to some embodiments of the present application, optionally, as Figures 25 to 31 shown, the second unwinding mechanism 391 and the second cutting mechanism 393 are two corresponding sets, and are spaced along the width direction D4 of the release 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 a standby position and a working position for the operation of the second glue taking mechanism 395. A set of second unwinding mechanism 391 and second cutting mechanism 393 are arranged at the standby position and the working position respectively.

[0343] Each second unwinding mechanism 391 and second cutting mechanism 393 can form a set. By arranging two sets of second unwinding mechanisms 391 and second cutting mechanisms 393, the interference of the reel changing 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 second cutting mechanisms 393 are arranged in layers in the height direction of the second tape attaching assembly 390.

[0344] 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 mechanism 391 and second cutting mechanism 393 that is working, which is convenient for the glue taking operation.

[0345] According to some embodiments of the present application, optionally, as Figures 25 to 31 shown, the second tape attaching assembly 390 includes a flipping assembly 360, and 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 arranged to drive the main pressing member 362 to press the main covering area 410 and the main surface 211, and the side pressing cylinder 363 is arranged to drive the side pressing member 364 to press the side covering area 430 and the side surface 213.

[0346] The side pressing member 364 and the main pressing member 362 can play a role in clamping and positioning the electrode assembly 200 and the covering film 400. The main pressing member 362 is arranged to form an avoidance of the pasting position of the second tape 520 when pressing the main covering area 410 and the main surface 211, and the side pressing member 364 is arranged to form an avoidance of the pasting position of the second tape 520 when pressing the side covering area 430 and the side surface 213. With such an arrangement, the stability of the tape pasting process can be improved.

[0347] According to some embodiments of the present application, optionally, as Figures 25 to 31 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 disposed on the rotating bracket 366, and the rotating motor 365 is configured to drive the rotating bracket 366 to rotate. The axis of rotation of the rotating bracket 366 is parallel to the second direction D2.

[0348] With such an arrangement, 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 180°, so as to be able to attach the second tape 520 to opposite sides of the electrode assembly 200 respectively.

[0349] According to some embodiments of the present application, optionally, as Figures 25 to 31 shown, the second tape pasting assembly 390 includes two second unwinding mechanisms 391. The flipping assembly 360 includes a shifting motor 367 and a shifting bracket 368, and the main pressing cylinder 361, the main pressing member 362, the side pressing cylinder 363, the side pressing member 364, the rotating motor 365, and the rotating bracket 366 are disposed on the shifting bracket 368. The shifting motor 367 is configured to drive the shifting bracket 368 to move along the interval direction D5 between the two second unwinding mechanisms 391.

[0350] 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 second cutting mechanisms 393, the interference of the reel changing operation of the second tape roll 396 on the pasting process can be reduced, and the glue taking efficiency can be improved. Further, the two sets of second unwinding mechanisms 391 and second cutting mechanisms 393 are arranged in layers in the height direction of the second tape pasting assembly 390.

[0351] By configuring 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 position of a set of second unwinding mechanism 391 and second cutting mechanism 393 that is working, facilitating the pasting operation.

[0352] According to some embodiments of the present application, optionally, as Figure 4 and Figure 32 shown, 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 tab 221, a separator 222, and a negative electrode tab 223 arranged in sequence.

[0353] With such an arrangement, it is beneficial to improve the space utilization rate of the electrode assembly 200 and increase the energy storage density of the electrode assembly 200.

[0354] Further, the two electrode modules 220 can be connected in series or in parallel through the pole ear parts 201.

[0355] Optionally, the two electrode modules 220 can be fixed together by fixing members 230 to improve the stability of the coating process. For example, the fixing member 230 is a tape.

[0356] According to some embodiments of the present application, optionally, as Figures 5 to 30As shown, the electrode assembly 200 includes an electrode body 210. The electrode body 210 has a first direction D1, a second direction D2, and a third direction D3 that are orthogonal to each other, and includes two main surfaces 211 disposed opposite to each other along the first direction D1, two end surfaces 212 disposed opposite to each other along the second direction D2, and two side surfaces 213 disposed opposite to each other along the third direction D3. The coating device 300 includes a tape feeding assembly 310, a cutting assembly 320, and a first coating assembly 330. The tape feeding assembly 310 is used to store and release a tape 401. The tape 401 includes a plurality of coating films 400 sequentially connected along the length direction D7 of the tape 401. Each coating film 400 includes two main coating regions 410 disposed at intervals from each other and a connection region 420 connected between the two main coating regions 410. The cutting assembly 320 is used to cut the first-end coating film 409 at the head end of the tape 401 from the tape 401. The first coating assembly 330 is used to coat the connection region 420 of the first-end coating film 409 on the first one 212a of the two end surfaces 212, and coat the two main coating regions 410 on the corresponding ones of the two main surfaces 211 respectively to form an electrode coating body 240. The first coating assembly 330 includes an electrode driving mechanism 331 and a main surface coating mechanism 332. The electrode driving mechanism 331 is used to convey the electrode assembly 200 along the second direction D2 so that the first one 212a of the two end surfaces 212 contacts the connection region 420. The main surface coating mechanism 332 is used to continue to drive the electrode assembly 200 along the second direction D2 after the first one 212a of the two end surfaces 212 contacts the connection region 420, and make the two main coating regions 410 be coated on the corresponding ones of the two main surfaces 211 respectively. The main surface coating mechanism 332 includes two pressing roller groups 333 arranged side by side and at intervals from each other. After the first one 212a of the two end surfaces 212 contacts the connection region 420, the electrode driving mechanism 331 feeds the electrode assembly 200 and the first-end coating film 409 between the two pressing roller groups 333. The two pressing roller groups 333 drive the electrode assembly 200 in a rolling manner and press the two main coating regions 410 on the corresponding ones of the two main surfaces 211 respectively. At least one of the two pressing roller groups 333 is arranged to be floatingly arranged along the first direction D1. With such an arrangement, an adaptive adjustment of the distance between the two pressing roller groups 333 can be realized, so that the distance between the two pressing roller groups 333 can better match the size of the electrode assembly 200 along the first direction D1, and the coating effect is improved. One of the two pressing roller groups 333 is an active pressing roller group 333, or the two pressing roller groups 333 are respectively active pressing roller groups 333, and the movement direction D8 of the contact point between the active pressing roller group 333 and the main surface 211 is the same as the movement direction D9 of the electrode driving mechanism 331.The first wrapping component 330 further includes a first film positioning mechanism 334 and a second film positioning mechanism 335. The first film positioning mechanism 334 is used to position one end of the first-end wrapping film 409 facing the feeding component 310, and the second film positioning mechanism 335 is used to position the other end of the first-end wrapping film 409 away from the feeding component 310, so that before the first of the two end faces 212, i.e., 212a, contacts the connection area 420, the connection area 420 of the first-end wrapping film 409 and the two main wrapping areas 410 are coplanar with each other, and the second direction D2 is perpendicular to the plane where the connection area 420 is located. The first wrapping component 330 further includes a third film positioning mechanism 336. The third film positioning mechanism 336 is located on the side of the first film positioning mechanism 334 facing the feeding component 310 and is used to position the subsequent wrapping film 411 adjacent to the first-end wrapping film 409. The cutting component 320 cuts the strip 401 between the first film positioning mechanism 334 and the third film positioning mechanism 336. The third film positioning mechanism 336 is further arranged to feed the subsequent wrapping film 411 into the first film positioning mechanism 334 and the second film positioning mechanism 335 after the first-end wrapping film 409 is cut off from the strip 401. The electrode assembly 200 further includes a pole ear part 201 protruding from the first of the two end faces 212, i.e., 212a. An opening 421 is provided on the connection area 420. The first wrapping component 330 is arranged such that the pole ear part 201 passes through the opening 421. The feeding component 310 includes two feeding mechanisms 311. Each feeding mechanism 311 stores and releases the strip 401 respectively. The strip 401 corresponding to the first of the two feeding mechanisms 311 serves as the working strip 402 and is fed into the first wrapping component 330. The strip 401 corresponding to the second of the two feeding mechanisms 311 serves as the spare strip 405. The wrapping device 300 further includes a switching component 340. The switching component 340 is used to fix the spare strip 405 to the working strip 402 so that the spare strip 405 is fed into the first wrapping component 330 under the movement of the working strip 402. The switching component 340 includes two pressing mechanisms 341 and a strip cutting mechanism 342. The two pressing mechanisms 341 cooperate with each other to clamp the working strip 402 and the spare strip 405 from both sides of the working strip 402 and the spare strip 405. The strip cutting mechanism 342 cuts the clamped working strip 402 and spare strip 405 so that the working strip 402 and the spare strip 405 respectively form an upstream part and a downstream part located upstream and downstream of the cutting position of the strip cutting mechanism 342. The two pressing mechanisms 341 connect the downstream part 403 of the working strip 402 with the upstream part 407 of the spare strip 405.The two pressing mechanisms 341 each include a pressing member 3411, and at least one of the two pressing mechanisms 341 includes a pressing driving member 3412. The pressing member 3411 includes a first pressing area 3414 and a second pressing area 3415 separated by a slot 3413. The pressing driving member 3412 drives at least one pressing member 3411 so that the two first pressing areas 3414 cooperate with each other to clamp the working tape 402 and the spare tape 405, and the two second pressing areas 3415 cooperate with each other to clamp the working tape 402 and the spare tape 405. The tape cutting mechanism 342 includes a cutter 3421. The cutter 3421 is telescopically disposed in the slot 3413 of the first one of the two pressing members 3411 and extends into the slot 3413 of the second one of the two pressing members 3411 in the clamped state, thereby cutting the working tape 402 and the spare tape 405. The tape cutting mechanism 342 includes an elastic member 3422. The elastic member 3422 is configured to elastically support the first one of the two pressing members 3411 so that the first one of the two pressing members 3411 elastically retracts in the clamped state, thereby causing the cutter 3421 to extend out of the slot 3413 of the first one of the two pressing members 3411. The first one of the two pressing mechanisms 341 is configured to simultaneously adsorb the downstream portion 403 of the working tape 402 and the upstream portion 407 of the spare tape 405. The second one of the two pressing mechanisms 341 is configured to apply a connecting tape at the joint position of the downstream portion 403 of the working tape 402 and the upstream portion 407 of the spare tape 405. The two pressing mechanisms 341 each include a pressing member 3411. The pressing member 3411 of the first one of the two pressing mechanisms 341 is configured to simultaneously adsorb the downstream portion 403 of the working tape 402 and the upstream portion 407 of the spare tape 405. The second one of the two pressing mechanisms 341 includes a pressing driving member 3412, a rotating driving member 3417, and an adhesive applying member 3418. The adhesive applying member 3418 is configured to carry the connecting tape. The rotating driving member 3417 is configured to be able to rotationally drive the adhesive applying member 3418 and the pressing member 3411 of the second one of the two pressing mechanisms 341 to switch between a first state and a second state. In the first state, the pressing members 3411 of the two pressing mechanisms 341 are disposed opposite to each other. In the second state, the adhesive applying member 3418 is disposed opposite to the pressing member 3411 of the first one of the two pressing mechanisms 341. The pressing driving member 3412 is configured to drive the pressing members 3411 of the two pressing mechanisms 341 to press against each other in the first state, and to drive the adhesive applying member 3418 and the pressing member 3411 of the first one of the two pressing mechanisms 341 to press against each other in the second state. The feeding assembly 310 corresponding to the working tape 402 is further configured to collect the upstream portion 404 of the working tape 402. The switching assembly 340 further includes a winding mechanism 312 for winding the downstream portion 406 of the spare tape 405.During the process of charging the upstream portion 404 of the working strip 402 and the downstream portion 406 of the spare strip 405, the two pressing mechanisms 341 are in a separated state. The two pressing mechanisms 341 are also arranged to adsorb the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405 respectively, and after the upstream portion 404 of the working strip 402 and the downstream portion 406 of the spare strip 405 are charged, transfer the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405 to the first one of the two pressing mechanisms 341. The two pressing mechanisms 341 respectively include pressing members 3411, and at least one of the two pressing mechanisms 341 includes a pressing driving member 3412. The pressing member 3411 includes a first pressing area 3414 and a second pressing area 3415 which are spaced from each other. The pressing driving member 3412 drives at least one pressing member 3411, so that the two first pressing areas 3414 cooperate with each other to clamp the working strip 402 and the spare strip 405, and the two second pressing areas 3415 cooperate with each other to clamp the working strip 402 and the spare strip 405. The strip cutting mechanism 342 cuts the working strip 402 and the spare strip 405 in the spaced area between the first pressing area 3414 and the second pressing area 3415. After the cutting is completed, the pressing driving member 3412 drives the two pressing members 3411 to separate from each other. The two pressing members 3411 respectively adsorb the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405, and after the upstream portion 404 of the working strip 402 and the downstream portion 406 of the spare strip 405 are charged, the pressing driving member 3412 drives the two pressing members 3411 to separate from each other, and the first one of the two pressing mechanisms 341 adsorbs the downstream portion 403 of the working strip 402 and the upstream portion 407 of the spare strip 405 simultaneously. The covering device 300 further includes a positioning assembly 350. The positioning assembly 350 is arranged to clamp and fix the electrode covering body 240 output by the first covering assembly 330 from the outside of the two main covering areas 410. 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. The positioning assembly 350 conveys the electrode covering body 240 to the second covering assembly 370. The second covering assembly 370 is arranged to drive the side covering area 430 to contact and cover on 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 along 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 along the third direction D3, so that the side pressing plate 371 presses the side covering area 430 on 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 such that the driving end covering area 440 contacts and covers the second one 212b of the two end faces 212. The second covering assembly 370 includes an end face 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 face pressing plate 374 in the first direction D1, so that the end face pressing plate 374 pushes the end covering area 440 to bend relative to the main covering area 410 towards the second one 212b of the two end faces 212. The third pressing plate driving mechanism 375 is used to drive the end face pressing plate 374 in the second direction D2, so that the end face pressing plate 374 presses the end covering area 440 against the second one 212b of the two end faces 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 face pressing plate 374 to move relative to the second pressing plate support 379. The covering film 400 further includes a side covering area 430 and an end covering area 440 connected to the main covering area 410. The side covering area 430 covers the side face 213, and the end covering area 440 covers the second one 212b of the two end faces 212. The covering device 300 further includes a first tape attaching assembly 380. The first tape attaching assembly 380 is used to drive the electrode assembly 200 and the first tape 510 to perform relative movement. The first tape 510 includes a first part and a second part connected to each other. The first tape attaching assembly 380 is arranged to attach the first part 511 of the first tape 510 to the side covering area 430 and attach the second part 512 of the first tape 510 to the end covering area 440 at the corner formed by the side face 213 and the second one 212b of the two end faces 212. The first tape attaching assembly 380 includes a first unwinding mechanism 381, a first tape pulling mechanism 382 and a first cutting mechanism 383. The first unwinding mechanism 381 is arranged to place and release the first tape roll 384. The first tape pulling mechanism 382 is arranged to clamp and pull the leading end of the released part of the first tape roll 384. The first cutting mechanism 383 is arranged to cut out the first tape 510 from the released part of the first tape roll 384.The first 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 head end of the release part, and the first glue pulling motor 3822 is used to drive the first glue clamping member 3823 to move to pull the release part. 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. 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 cutter 3832 and a first cutting cylinder 3833. The first pressing block 3831 and the first cutter 3832 are relatively fixedly arranged. The first cutting cylinder 3833 is arranged to drive the first pressing block 3831 to press the release part onto the first glue taking mechanism 386, and drive the first cutter 3832 to cut out the first tape 510 from the release part. 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 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 support 3864 and a second glue taking support 3865. The first glue taking member 3861 is used to adsorb the first tape 510. The first glue taking motor 3862 is arranged on the first glue taking support 3864 and drives the second glue taking support 3865 to move above the release part. The second glue taking motor 3863 is arranged on the second glue taking support 3865 and drives the first glue taking member 3861 to approach and move away from the plane where the release part is located. The first glue taking member 3861 includes a first sub-glue taking part 3866 and a second sub-glue taking part 3867. The first sub-glue taking part 3866 is used to adsorb the first part 511 of the first tape 510 and attach it to the side covering area 430. The second sub-glue taking part 3867 is used to adsorb the second part 512 of the first tape 510 and attach it to the end covering area 440. The first sub-glue taking part 3866 is a telescopic member.The second glue-taking motor 3863 drives the first glue-taking member 3861 in the third direction D3. The first sub-glue-taking portion 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-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 and holds the second part 512 of the first tape 510 on 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 released 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 a first glue-taking mechanism 386. The first glue-taking 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, 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 to adsorb the first tape 510. The first glue-taking motor 3862 is arranged on the first glue-taking bracket 3864 and drives the second glue-taking bracket 3865 to move above the released portion. The second glue-taking motor 3863 is arranged 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 released portion is located. The glue-distributing cylinder 3869 is arranged on the third glue-taking bracket 3868. The glue-distributing cylinder 3869 is configured to drive the two first glue-taking members 3861 to move away from each other, so that the two first glue-taking members 3861 respectively correspond to two corners of the electrode assembly 200 spaced apart in the third direction D3. The covering device 300 further includes a second tape attaching assembly 390. The second tape attaching assembly 390 is used to drive the electrode assembly 200 and the second tape 520 to perform relative movement. The second tape 520 includes a first part and a second part connected to each other. The second tape attaching assembly 390 is configured to attach the first part 521 of the second tape 520 to the main covering area 410 and attach the second part 522 of the second tape 520 to the side covering 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 configured to attach the two first parts of the second tape 520 to the corresponding one of the two main covering 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 configured to place and release a second tape roll 396. The second tape pulling mechanism 392 is configured to grip 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 a second tape 520 from the released portion 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 grip the leading end of the released portion, and the second tape pulling motor 3922 is used to drive the second tape clamping member 3923 to move to pull the released portion. The second unwinding mechanism 391 and the second cutting mechanism 393 are two corresponding sets and are spaced apart along the width direction D4 of the released portion. 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 a standby position and a working position for the second tape pulling mechanism 392 to operate. One set of the second unwinding mechanism 391 and the second cutting mechanism 393 is provided at each of the standby position and the working position. The second tape attaching assembly 390 includes a second tape picking mechanism 395, and the second tape picking mechanism 395 is used to adsorb and pick 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 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. The second tape attaching assembly 390 includes a second tape picking mechanism 395, and the second tape picking mechanism 395 is used to adsorb and pick 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 support 3953. The second tape picking member 3951 is used to adsorb the second tape 520. The fourth tape picking motor 3952 is disposed on the fourth tape picking support 3953 and drives the second tape picking member 3951 to move to be disposed opposite to the released portion along the thickness direction D6 of the released portion, and drives the second tape picking member 3951 to approach and move away from the plane where the released portion is located. The second tape picking member 3951 includes a third sub-tape picking portion 3954 and a fourth sub-tape picking portion 3955. The third sub-tape picking 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 glue taking part 3955 is used to absorb the second part 522 of the second adhesive tape 520 and attach it to the side covering area 430. The fourth glue taking part 3955 is a telescopic part. The fourth glue taking motor 3952 drives the second glue taking part 3951 along the third direction D3, and the fourth glue taking part 3955 presses the second part 522 of the second adhesive tape 520 on the side covering area 430 and shrinks, so that the third glue taking part 3954 can continue to move along the third direction D3 and fit the main covering area 410, and then attach the first part 521 of the second adhesive tape 520 to the main covering area 410. The second unwinding mechanism 391 and the second cutting mechanism 393 are two corresponding groups, and are spaced apart along the width direction D4 of the release part. The second glue taking mechanism 395 includes a glue taking transposition cylinder 3956 and a glue taking transposition bracket 3957. The glue taking and 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 and changing bracket 3957. The glue taking and changing cylinder 3956 is arranged to drive the glue taking and changing bracket 3957 to move along the spacing direction D5 of the two second unwinding mechanisms 391, so that the second glue taking member 3951 can be switched between the standby position and the working position for the second glue taking mechanism 395 to operate. A set of the second unwinding mechanism 391 and the second cutting mechanism 393 are respectively arranged at the standby position and the working position.

[0357] 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.

[0358] 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.

[0359] 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.

[0360] The purpose of the tab welding device is to form the tab part 201 after pre-welding the tab pieces. It can be an ultrasonic welding device, which can ensure that the tabs are welded in a stable clamped state. The device for inserting into the shell is a pushing mechanism or a clamping mechanism, which can stably move the electrode assembly 200 towards the open end 112 of the shell 100 and enter the accommodation cavity through the open end 112. Similarly, the tab-passing device can adopt a clamping structure or a guiding structure, which can guide the tab part 201 to pass through the through-hole smoothly without interfering with the shell 100. The purpose of the terminal welding device is to weld the tab part 201 and the terminal, and it can be a laser welding device. The purpose of the bottom cover welding device is to weld the circumferential edge of the bottom cover and the open end 112 of the shell 100, and it is also a laser welding device.

[0361] In addition, the assembly device is not limited to including the tab welding device, the device for inserting into the shell, the tab-passing device, the terminal welding device, and the bottom cover welding device. Exemplarily, when the electrode assembly 200 includes multiple electrode modules 220, for example, when it includes two electrode modules 220, the assembly device further includes a pairing component, which is used to stack multiple electrode modules 220 so that the tab pieces of the two electrode modules 220 are approximately opposite to each other, so that the conveying structure can convey the paired electrode modules 220 to the tab welding device for welding the tab pieces to facilitate the formation of the tab part 201. Another example is that in order to ensure the reliability of the battery assembly process, a dust removal and NG detection station, etc. can also be added between any two adjacent stations, which is not limited in this embodiment.

[0362] The electrode assembly described in the embodiment of the coating method of the electrode assembly of the present application includes an electrode body, the electrode body has a first direction, a second direction, and a third direction that are orthogonal to each other, and includes two main surfaces arranged opposite to each other along the first direction, two end surfaces arranged opposite to each other along the second direction, and two side surfaces arranged opposite to each other along the third direction. The coating method includes: S100: Control the feeding component to release the tape, the tape includes a plurality of coating films connected in sequence along the length direction of the tape, and each coating film includes two main coating areas arranged at intervals and a connecting area connected between the two main coating areas. S200: Control the cutting component to cut off the leading coating film at the leading end of the tape from the tape. S300: Control the first coating component to coat the connecting area of the leading coating film on the first of the two end surfaces, and coat the two main coating areas on the corresponding ones of the two main surfaces respectively to form an electrode coating body.

[0363] According to some embodiments of the present application, optionally, controlling the first coating component to coat the connecting area of the leading coating film on the first of the two end surfaces, and coat the two main coating areas on the corresponding ones of the two main surfaces respectively, includes:

[0364] S310: Control the electrode driving mechanism to convey the electrode assembly in the second direction so that the first of the two end faces contacts the connection area and is fed between the two press roller groups.

[0365] S320: Control the two press roller groups to continue to convey the electrode assembly in the first direction in a rolling manner and press the two main covering areas against the corresponding one of the two main faces respectively.

[0366] According to some embodiments of the present application, optionally, the feeding assembly includes two feeding mechanisms, each feeding mechanism stores and releases a strip respectively, wherein the strip corresponding to the first of the two feeding mechanisms is used as the working strip and is fed into the first covering assembly, and the strip corresponding to the second of the two feeding mechanisms is used as the spare strip. The covering method further includes:

[0367] S400: Control the two pressing mechanisms to cooperate with each other to clamp the working strip and the spare strip from both sides of the working strip and the spare strip.

[0368] S500: Control the strip cutting mechanism to cut the working strip and the spare strip in the clamped state so that the working strip and the spare strip respectively form an upstream part and a downstream part located upstream and downstream of the cutting position of the strip cutting mechanism.

[0369] S600: Control the two pressing mechanisms to connect the downstream part of the working strip with the upstream part of the spare strip.

[0370] According to some embodiments of the present application, optionally, controlling the two pressing mechanisms to connect the downstream part of the working strip with the upstream part of the spare strip includes:

[0371] S610: Control the first of the two pressing mechanisms to adsorb the downstream part of the working strip and the upstream part of the spare strip simultaneously.

[0372] S620: Control the second of the two pressing mechanisms to apply a connecting tape at the joint position of the downstream part of the working strip and the upstream part of the spare strip.

[0373] According to some embodiments of the present application, optionally, the electrode assembly includes an ear part, the ear part protrudes from the first of the two end faces, and an opening is provided on the connection area. Controlling the first covering assembly to cover the connection area of the head covering film on the first of the two end faces includes:

[0374] S330: Control the first covering assembly to pass the ear part through the opening, and the connection area contacts and covers the first of the two end faces.

[0375] 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 device of the electrode assembly above, and details will not be described herein again.

[0376] In summary, the embodiments of the present application can be implemented such that the strip can continuously provide the coating film, simplify the complexity of the operation of taking the coating film, enable the continuous feeding of the coating film, reduce the arrangement of the manipulator, simplify the complexity of the operations in the coating process, and facilitate the maintenance of the coating equipment.

[0377] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; 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 by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions 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 having 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 coating device includes: a feeding assembly for storing and releasing a tape. The tape includes a plurality of coating films sequentially connected along the length direction of the tape. Each coating film includes two main coating regions arranged at intervals and a connecting region connecting the two main coating regions; a cutting assembly for cutting the leading coating film at the leading end of the tape from the tape; a first coating assembly for coating the connecting region of the leading coating film on the first of the two end surfaces and coating the two main coating regions on the corresponding one of the two main surfaces respectively to form an electrode coating body.

2. The coating device according to claim 1, characterized in that, the first coating assembly includes: an electrode driving mechanism for transmitting the electrode assembly along the second direction so that the first of the two end surfaces contacts the connecting region; a main surface coating mechanism for continuously transmitting the electrode assembly along the second direction after the first of the two end surfaces contacts the connecting region and for coating the two main coating regions on the corresponding one of the two main surfaces respectively.

3. The coating device according to claim 2, characterized in that, the main surface coating mechanism includes two sets of pressing rollers arranged side by side and at intervals. The electrode driving mechanism feeds the electrode assembly and the leading coating film between the two sets of pressing rollers after the first of the two end surfaces contacts the connecting region. The two sets of pressing rollers drive the electrode assembly in a rolling manner and press the two main coating regions on the corresponding one of the two main surfaces respectively.

4. The coating device according to claim 3, characterized in that, at least one of the two sets of pressing rollers is arranged to be floatingly arranged along the first direction.

5. The coating device according to claim 3, characterized in that, one of the two sets of pressing rollers is an active pressing roller set, or the two sets of pressing rollers are respectively active pressing roller sets, and the moving direction of the contact point of the active pressing roller set with the main surface is the same as the moving direction of the electrode driving mechanism.

6. The coating device according to claim 2 or 3, characterized in that, the first coating assembly further includes a first film positioning mechanism and a second film positioning mechanism. The first film positioning mechanism is used to position one end of the leading coating film facing the feeding assembly, and the second film positioning mechanism is used to position the other end of the leading coating film away from the feeding assembly so that before the first of the two end surfaces contacts the connecting region, the connecting region and the two main coating regions of the leading coating film are coplanar, and the second direction is perpendicular to the plane where the connecting region is located.

7. The covering device according to claim 6, wherein, the first covering assembly further includes a third film positioning mechanism, which is located on one side of the first film positioning mechanism facing the material feeding assembly and is used for positioning the subsequent covering film adjacent to the head covering film, and the cutting assembly cuts the material tape between the first film positioning mechanism and the third film positioning mechanism.

8. The covering device according to claim 7, wherein, the third film positioning mechanism is further configured to feed the subsequent covering film into the first film positioning mechanism and the second film positioning mechanism after the head covering film is cut off from the material tape.

9. The covering device according to claim 1, wherein, the electrode assembly further includes a pole ear portion protruding from the first of the two end faces, an opening is provided in the connection area, and the first covering assembly is configured such that the pole ear portion passes through the opening.

10. The covering device according to claim 1, wherein, the material feeding assembly includes two material feeding mechanisms, each of the material feeding mechanisms stores and releases the material tape respectively, wherein the material tape corresponding to the first of the two material feeding mechanisms is used as the working material tape and is fed into the first covering assembly, the material tape corresponding to the second of the two material feeding mechanisms is used as the spare material tape, and the covering device further includes a switching assembly, and the switching assembly is used for fixing the spare material tape to the working material tape so that the spare material tape is fed into the first covering assembly under the drive of the working material tape.

11. The covering device according to claim 10, wherein, the switching assembly includes two pressing mechanisms and a material tape cutting mechanism, the two pressing mechanisms cooperate with each other to clamp the working material tape and the spare material tape from both sides of the working material tape and the spare material tape, the material tape cutting mechanism cuts the working material tape and the spare material tape in the clamped state so that the working material tape and the spare material tape respectively form an upstream portion and a downstream portion located upstream and downstream of the cutting position of the material tape cutting mechanism, and the two pressing mechanisms connect the downstream portion of the working material tape with the upstream portion of the spare material tape.

12. The covering device according to claim 11, wherein, the two pressing mechanisms respectively include pressing members, and at least one of the two pressing mechanisms includes a pressing driving member, the pressing member includes a first pressing area and a second pressing area separated by a slot, the pressing driving member drives at least one of the pressing members so that the two first pressing areas cooperate with each other to clamp the working material tape and the spare material tape, and the two second pressing areas cooperate with each other to clamp the working material tape and the spare material tape, the material tape cutting mechanism includes a cutting knife, the cutting knife is telescopically arranged in the slot of the first of the two pressing members and extends into the slot of the second of the two pressing members in the clamped state, and further cuts the working material tape and the spare material tape.

13. The covering device according to claim 12, wherein, The tape cutting mechanism includes an elastic member configured to elastically support the first of the two pressing members, so that the first of the two pressing members elastically retracts in the clamping state, and thus the cutter extends out of the slot of the first of the two pressing members.

14. The covering device according to claim 11, wherein, the first of the two pressing mechanisms is configured to simultaneously adsorb the downstream portion of the working tape and the upstream portion of the spare tape, and the second of the two pressing mechanisms is configured to apply a connecting tape at the joint position of the downstream portion of the working tape and the upstream portion of the spare tape.

15. The covering device according to claim 14, wherein, the two pressing mechanisms respectively include pressing members. The pressing member of the first of the two pressing mechanisms is configured to simultaneously adsorb the downstream portion of the working tape and the upstream portion of the spare tape. The second of the two pressing mechanisms includes a pressing driving member, a rotating driving member, and a tape sticking member. The tape sticking member is configured to carry the connecting tape. The rotating driving member is configured to be able to rotationally drive the tape sticking member and the pressing member of the second of the two pressing mechanisms to switch between a first state and a second state. In the first state, the pressing members of the two pressing mechanisms are arranged opposite to each other. In the second state, the tape sticking member is arranged opposite to the pressing member of the first of the two pressing mechanisms. The pressing driving member is configured to drive the pressing members of the two pressing mechanisms to press against each other in the first state, and drive the tape sticking member and the pressing member of the first of the two pressing mechanisms to press against each other in the second state.

16. The covering device according to claim 14, wherein, the feeding assembly corresponding to the working tape is further configured to collect the upstream portion of the working tape, and the switching assembly further includes a winding mechanism for winding the downstream portion of the spare tape.

17. The covering device according to claim 16, wherein, during the process of collecting the upstream portion of the working tape and the downstream portion of the spare tape, the two pressing mechanisms are in a separated state. The two pressing mechanisms are further configured to respectively adsorb the downstream portion of the working tape and the upstream portion of the spare tape, and after the upstream portion of the working tape and the downstream portion of the spare tape are collected, transfer the downstream portion of the working tape and the upstream portion of the spare tape to the first of the two pressing mechanisms.

18. The covering device according to claim 14, wherein, The two pressing mechanisms each include a pressing member, and at least one of the two pressing mechanisms includes a pressing driving member. The pressing member includes a first pressing area and a second pressing area spaced apart from each other. The pressing driving member drives at least one of the pressing members so that the two first pressing areas cooperate with each other to clamp the working strip and the spare strip, and the two second pressing areas cooperate with each other to clamp the working strip and the spare strip. The strip cutting mechanism cuts the working strip and the spare strip in the interval area between the first pressing area and the second pressing area; After the cutting is completed, the pressing driving member drives the two pressing members to separate from each other. The two pressing members respectively adsorb the downstream part of the working strip and the upstream part of the spare strip. After the upstream part of the working strip and the downstream part of the spare strip are collected, the pressing driving member drives the two pressing members to separate from each other, and the first of the two pressing mechanisms adsorbs the downstream part of the working strip and the upstream part of the spare strip at the same time.

19. The coating equipment according to claim 1, wherein, the coating equipment further includes a positioning assembly configured to clamp and fix the electrode coating body output by the first coating assembly from the outside of the two main coating areas.

20. The coating equipment according to claim 19, wherein, the coating film includes a side coating area connected to the main coating area. The coating equipment further includes a second coating assembly. The positioning assembly conveys the electrode coating body to the second coating assembly, and the second coating assembly is configured to drive the side coating area to contact and coat on the side surface.

21. The coating equipment according to claim 20, 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 used to drive the side pressing plate in the 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. The second pressing plate driving mechanism is used to drive the side pressing plate in the third direction so that the side pressing plate presses the side coating area on the side surface.

22. The coating equipment according to claim 21, wherein, the coating film includes an end coating area connected to the main coating area. The second coating assembly is configured to drive the end coating area to contact and coat on the second of the two end surfaces.

23. The coating equipment according to claim 22, 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 used 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 relative to the main coating area toward the second of the two end surfaces. The third pressing plate driving mechanism is used to drive the end face pressing plate in the second direction so that the end face pressing plate presses the end coating area on the second of the two end surfaces.

24. The coating device according to claim 1, characterized in that, the coating film further includes a side coating area and an end coating area connected to the main coating area, wherein the side coating area is coated on the side surface, the end coating area is coated on the second of the two end surfaces, and the coating device further includes a first tape attaching assembly for driving relative movement between the electrode assembly and the first tape. 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.

25. The coating device according to claim 24, characterized in that, 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 part of the first tape roll. The first cutting mechanism is configured to cut out the first tape from the released part of the first tape roll.

26. The coating device according to claim 25, characterized in that, 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 part. The first tape pulling motor is used to drive the first tape clamping member to move to pull the released part.

27. The coating device according to claim 25, characterized in that, 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 part is located.

28. The coating device according to claim 25, characterized in that, 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 part onto the first tape picking mechanism and drive the first cutting knife to cut out the first tape from the released part.

29. The coating device according to claim 25, characterized in that, 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 support, and a second glue-taking support. The first glue-taking member is used for adsorbing the first tape. The first glue-taking motor is arranged on the first glue-taking support and drives the second glue-taking support to move above the release portion. The second glue-taking motor is arranged on the second glue-taking support and drives the first glue-taking member to approach and move away from the plane where the release portion is located.

30. The covering device according to claim 29, 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.

31. The covering device according to claim 30, wherein, the first sub-glue-taking portion is a telescopic member. The second glue-taking motor drives the first glue-taking member along 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 along 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 along the second direction. The second sub-glue-taking portion presses the second part of the first tape against the end covering area and contracts, so that the first sub-glue-taking portion can continue to move along the second direction and fit the side covering area, and then attach the first part of the first tape to the side covering area.

32. The covering device according to claim 31, wherein, the first cutting mechanism is configured to cut out two of the first tapes from the release portion. The number of the first glue-taking members is two, and each adsorbs a corresponding first tape. 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 support, a second glue-taking support, a third glue-taking support, and a glue separating cylinder. The first glue-taking member is used for adsorbing the first tape. The first glue-taking motor is arranged on the first glue-taking support and drives the second glue-taking support to move above the release portion. The second glue-taking motor is arranged on the second glue-taking support and drives the third glue-taking support and the two first glue-taking 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 support 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 along the third direction.

33. The coating device according to claim 24, characterized in that, the coating device further includes a second tape attaching assembly for driving the electrode assembly and the second tape to move relative to each other. 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.

34. The coating device according to claim 33, characterized in that, the number of the first parts of the second tape is two and located at both ends of the second part of the second tape. 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.

35. The coating device according to claim 33 or 34, characterized in that, 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.

36. The coating device according to claim 35, characterized in that, 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.

37. The coating device according to claim 35, characterized in that, the second unwinding mechanism and the second cutting mechanism are two corresponding groups and are arranged at intervals in 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 between the two second unwinding mechanisms so that the second tape pulling mechanism can be switched between a standby position and a working position for the second tape pulling mechanism to operate. One group of the second unwinding mechanism and the second cutting mechanism are arranged at each of the standby position and the working position.

38. The coating device according to claim 35, characterized in that, 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.

39. The covering device according to claim 35, characterized in that, 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 arranged on the fourth tape picking support and drives the second tape picking member to move to be oppositely arranged along the thickness direction of the release part relative to the release part, and drives the second tape picking member to approach and move away from the plane where the release part is located.

40. The covering device according to claim 39, characterized in that, the second tape picking member includes a third sub-tape picking part and a fourth sub-tape picking part; the third sub-tape picking part is used for adsorbing the first part of the second tape and attaching it to the main covering area; the fourth sub-tape picking part is used for adsorbing the second part of the second tape and attaching it to the side covering area.

41. The covering device according to claim 40, characterized in that, the fourth sub-tape picking part is a telescopic member; the fourth tape picking motor drives the second tape picking member along the third direction, and the fourth sub-tape picking part presses the second part of the second tape on the side covering area and contracts, so that the third sub-tape picking part 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.

42. The covering device according to claim 39, characterized in that, 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 part; the second tape picking mechanism includes a tape picking position-changing cylinder and a tape picking position-changing support; the tape picking position-changing cylinder is arranged on the fourth tape picking support, and the second tape picking member is arranged on the tape picking position-changing support; the tape picking position-changing cylinder is arranged to drive the tape picking position-changing support to move along the interval direction of the two second unwinding mechanisms, so that the second tape picking member can be switched between a standby position and a working position for the second tape picking mechanism to operate; a set of the second unwinding mechanism and the second cutting mechanism are arranged at each of the standby position and the working position.

43. A method for covering an electrode assembly, characterized in that, the electrode assembly includes an electrode body having a first direction, a second direction, and a third direction that are orthogonal to each other, and includes two main surfaces 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 covering method includes: controlling a feeding assembly to release a tape, the tape including a plurality of covering films sequentially connected along the length direction of the tape, and each covering film includes two main covering areas arranged at intervals from each other and a connecting area connecting the two main covering areas; controlling a cutting assembly to cut off the leading covering film at the leading end of the tape from the tape; Control the first wrapping component to wrap the connection area of the head-end wrapping film on the first of the two end faces, and wrap the two main wrapping areas on the corresponding one of the two main faces respectively, so as to form an electrode wrapping body.

44. The wrapping method according to claim 43, wherein, the control of the first wrapping component to wrap the connection area of the head-end wrapping film on the first of the two end faces and wrap the two main wrapping areas on the corresponding one of the two main faces respectively includes: Control the electrode driving mechanism to convey the electrode component along the second direction, so that the first of the two end faces contacts the connection area and is fed between two pairs of pressing rollers; Control the two pairs of pressing rollers to continue to convey the electrode component in a rolling manner along the first direction, and press the two main wrapping areas on the corresponding one of the two main faces respectively.

45. The wrapping method according to claim 43, wherein, the feeding component includes two feeding mechanisms, each feeding mechanism stores and releases the tape respectively, wherein the tape corresponding to the first of the two feeding mechanisms is used as the working tape and is fed into the first wrapping component, and the tape corresponding to the second of the two feeding mechanisms is used as the spare tape; The wrapping method further includes: Control two pressing mechanisms to cooperate with each other to clamp the working tape and the spare tape from both sides of the working tape and the spare tape; Control the tape cutting mechanism to cut the working tape and the spare tape in the clamped state, so that the working tape and the spare tape respectively form an upstream part and a downstream part located upstream and downstream of the cutting position of the tape cutting mechanism; Control the two pressing mechanisms to connect the downstream part of the working tape with the upstream part of the spare tape.

46. The wrapping method according to claim 45, wherein, the control of the two pressing mechanisms to connect the downstream part of the working tape with the upstream part of the spare tape includes: Control the first of the two pressing mechanisms to adsorb the downstream part of the working tape and the upstream part of the spare tape simultaneously; Control the second of the two pressing mechanisms to apply a connecting tape at the joint position of the downstream part of the working tape and the upstream part of the spare tape.

47. The wrapping method according to claim 43, wherein, the electrode component includes an electrode tab, the electrode tab protrudes from the first of the two end faces, and an opening is provided on the connection area; The control of the first wrapping component to wrap the connection area of the head-end wrapping film on the first of the two end faces includes: Control the first wrapping component to pass the electrode tab through the opening, and the connection area contacts and wraps on the first of the two end faces.

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