CN114801044A

CN114801044A - Tab forming device and tab forming method

Info

Publication number: CN114801044A
Application number: CN202210754720.1A
Authority: CN
Inventors: 文青山; 刘进; 王志欢; 苏佳景
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-07-29
Anticipated expiration: 2042-06-30
Also published as: CN114801044B

Abstract

The present application discloses a tab forming device and a tab forming method. The tab forming device includes a first template, a second template, a first conversion head, a second conversion head, a plastic injection part and a cover part. The first template is provided with a first flow channel, the side of the second template facing the first template is provided with a second flow channel, the first conversion head is connected with the first template, and the second conversion head is connected with the second template. The first template is configured to be movable relative to the cover to interface with the cover or with the second template. When the first template and the cover member are connected, the cover member covers the first flow channel, and the glue injection member injects glue into the first flow channel through the first conversion head to complete the first glue injection. When the first template and the second template are connected, the first flow channel and the second flow channel are connected, and the glue injection part is injected into the second flow channel through the second conversion head to complete the second glue injection. In the present application, the tab glue is formed by injection molding, which improves the sealing performance of the tab part of the battery.

Description

Tab forming device and tab forming method

Technical Field

The application relates to the technical field of energy storage, in particular to a tab forming device and a tab forming method.

Background

The lithium ion battery has an important process in the production and manufacturing process of welding the lugs, the battery draws electricity out through the lugs to generate a loop, the production of the battery lugs is an independent process, and the lugs comprise metal lug plates capable of conducting electricity and lug glue arranged on the lug plates.

The prior tab production process is to adhere two tab adhesives to the upper side and the lower side of a tab piece in a hot pressing mode, so that the upper layer tab adhesive, the lower layer tab adhesive and the tab piece form a whole. The existing tab production process is difficult to overcome the problem that a passage exists between upper and lower tab glue layers and tab sheets, and the passage extends along the extension direction of the tab, so that the electrolyte of a battery is leaked.

Disclosure of Invention

In view of the above, it is desirable to provide a tab forming apparatus capable of manufacturing a tab capable of improving the sealability of a battery.

In addition, a tab forming method using the tab forming device is also needed.

Some embodiments in the present application provide a tab forming device, which includes a first template, a second template, a first conversion head, a second conversion head, a glue injection member, and a sealing cover member.

The first template is used for installing the pole lug pieces and is provided with a first flow channel. The second template is arranged on one side of the first template along the first direction, the second template is configured to move towards the first direction and the direction opposite to the first direction, and a second flow passage is arranged on one side of the second template facing the first template. In a first direction, a cover member is disposed at one side of the first template, the cover member being configured to be movable in the first direction and a direction opposite to the first direction. The first conversion head is connected with the first template and communicated with the first flow channel; the second conversion head is connected with the second template and communicated with the second flow passage. The glue injection piece is configured to be capable of moving towards a first direction and a direction opposite to the first direction. The first template can move relative to the cover sealing piece to be connected with the cover sealing piece or the second template, when the first template is connected with the cover sealing piece, the glue injection piece is communicated with the first conversion head, the cover sealing piece covers the first flow channel, when the first template is connected with the second template, the glue injection piece is communicated with the second conversion head, and the first flow channel is communicated with the second flow channel.

Above-mentioned utmost point ear forming device can cover utmost point ear piece through the mode of moulding plastics with utmost point ear glue through the first runner of first template, the second runner of second template, first conversion head, second conversion head, injecting glue spare and closing cap spare, has overcome the passageway that runs through between utmost point ear glue and the utmost point ear piece and has leaded to the problem that electrolyte was revealed, has promoted the leakproofness of battery. Two injecting glues can be accomplished in proper order to utmost point ear forming device, can reduce the space of moulding plastics when single injecting glue, and then reduce the required injecting glue pressure of moulding plastics, promoted the homogeneity of moulding plastics and reduced utmost point auricle by the risk of kicking.

In some embodiments, along the first direction, the second conversion head is arranged opposite to the first conversion head, the first conversion head is arranged towards one side of the second conversion head in an open manner, the second conversion head is arranged towards one side of the first conversion head in an open manner, and when the glue injection piece is communicated with the second conversion head, the first conversion head is communicated with the second conversion head.

Above-mentioned first passageway and second passageway intercommunication can let fused utmost point ear glue when injecting glue the second time can glue the contact with the utmost point ear in the first passageway to promote the gluey combination effect of the utmost point ear of twice injection.

In some embodiments, a side of the first conversion head facing the second conversion head is provided with a first mounting surface, a side of the second conversion head facing the first conversion head is provided with a second mounting surface, and when the glue injection piece is communicated with the second conversion head, the first mounting surface and the second mounting surface are in contact.

The first mounting surface is in contact with the second mounting surface, so that the contact area between the first conversion head and the second conversion head can be increased, and the stability of mounting between the first conversion head and the second conversion head is facilitated.

In some embodiments, the first flow channel and the second flow channel both extend in a second direction, the second direction is perpendicular to the first direction, the number of the first conversion heads is two, the two first conversion heads are oppositely arranged in the second direction, the number of the second conversion heads is two, and the two second conversion heads are oppositely arranged in the second direction. The two opposite ends of the first runner and the second runner in the second direction can start glue injection simultaneously when glue injection is performed, glue injection efficiency and glue injection uniformity can be improved, and bubbles are reduced.

In some embodiments, the tab forming device further comprises a heating element which acts on the first template and/or the second template.

The heating member heats the first template before the first glue injection, so that the glue injection is smoother, and the uniformity of the glue injection is improved. The heating member heats after the secondary injecting glue is accomplished and can further promote the combination effect between utmost point ear glue and the utmost point ear piece.

The embodiment of the application further provides a tab forming method using the tab forming device in any one of the embodiments, which comprises a tab mounting step, a first glue injection step, a tab gelling and fixing step, a die assembly step and a second glue injection step. In the step of installing the tab piece, the tab piece is placed in the first flow passage, and the sealing cover piece is installed to cover the first flow passage. In the first glue injection step, molten tab glue is injected into the first conversion head through the glue injection piece, so that the molten tab glue flows into the first flow channel through the first channel. And in the step of gluing and fixing the tab, separating the sealing cover part from the first template after the tab glue in the first flow channel is solidified. And in the step of die assembly, controlling the second template to be connected with the first template, so that a second runner is arranged on one side of the tab piece, which is far away from the first runner. And in the second glue injection step, injecting the molten tab glue into the second conversion head through the glue injection piece, so that the molten tab glue flows into the second flow channel through the second channel.

The twice glue injection can reduce the glue injection space during single glue injection, further reduce the glue injection pressure required by injection molding and reduce the risk that the pole lug is bent by impact.

In some embodiments, the tab sheet mounting step further comprises: the first template and the second template are heated to 50 ℃ to 130 ℃.

The first template and the second template are heated in advance, so that the time for solidifying the tab glue in the glue injection process can be reduced, and the risk that the molten tab glue is solidified in advance and is not beneficial to glue injection is reduced.

In some embodiments, the second glue injection step further includes: and waiting for the solidification of the tab glue in the second flow channel, and heating the tab sheet to 190-210 ℃.

After the tab piece is heated, the tab glue part contacting with the tab piece can be softened and melted, the glue injection effect is further improved, and the associativity between the tab piece and the tab is improved.

In some embodiments, the second glue injection step further includes: and waiting for the solidification of the tab glue in the second flow channel, and cutting off the solidified tab glue at the position between the tab piece and the first conversion head.

In some embodiments, the time for waiting for the tab glue in the second flow passage to solidify is 20s-30 s. The tab glue can be solidified within the time range, the cutting step can be implemented, and the processing efficiency is improved.

In some embodiments, the distance between the pole tab and the first transducing head is a, satisfying 4mm ≦ a ≦ 8 mm.

In some embodiments, the distance between the position for cutting off the tab glue and the first conversion head is b, and the requirement that b is more than or equal to 1mm and less than or equal to 3mm is met; the distance between the position for cutting off the tab glue and the tab sheet is c, and c is more than or equal to 3 and less than or equal to 5 mm.

The cutting of the tab glue within the range can ensure that the tab glue exceeds the tab piece in the extending direction of the wide edge of the tab piece, and can also finish cutting under the condition that the cutter does not interfere with the tab piece, thereby reducing waste materials.

In some embodiments, the pressure of the injected tab glue is 70MPa-100MPa, the glue injection speed is 200g/s-450g/s, and the glue injection time is 1.5s-2.5 s.

In some embodiments, mounting a cover to cover the first flow passage further comprises: and fixing the sealing cover piece on one side of the pole lug piece, which is far away from the first flow channel, and enabling the sealing cover piece to be in contact with the pole lug piece. The arrangement can ensure that the molten tab adhesive can be contacted with the end surface of the long edge of the tab sheet when the first glue injection is carried out, and the installation of the sealing cover piece is also convenient.

Utmost point ear forming device in this application includes first template, second template, first conversion head, second conversion head, injecting glue piece and closing cap spare. The second template is arranged on one side of the first template along the first direction, and the cover piece is arranged on one side of the first template along the first direction. The second template, the cover member and the glue injection member are all configured to be capable of moving towards a first direction and a direction opposite to the first direction. When the first template is connected with the sealing cover piece, the sealing cover piece seals the first runner, and the glue injection piece injects molten glue into the first runner through the first conversion head to complete first glue injection. When the first template is connected with the second template, the glue injection piece injects the molten glue into the second runner through the second conversion head, and secondary glue injection is completed. The pole lug is coated with the pole lug glue in an injection molding mode, so that the sealing performance of the battery is improved. Twice glue injection is completed in sequence, the glue injection pressure required by injection molding can be reduced, the injection molding uniformity is improved, and the risk that the pole lug is bent by impact is reduced.

Drawings

Fig. 1 is a cross-sectional view of a tab forming device and a tab piece according to an embodiment of the present application.

Fig. 2 is an exploded view of a tab forming device and a tab piece according to an embodiment of the present disclosure.

Fig. 3 is an exploded view of a tab forming device and a tab piece according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a second template according to an embodiment of the present application.

Fig. 5 is a schematic view illustrating a first glue injection of a glue injection member according to an embodiment of the present application.

Fig. 6 is a schematic view of a first glue injection of the glue injection member according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a second injection of the injection molding member according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a second glue injection of the glue injection member according to an embodiment of the present application.

Fig. 9 is a schematic diagram illustrating cutting of tab glue according to an embodiment of the present application.

Fig. 10 is a flowchart of a tab forming method according to an embodiment of the present application.

Description of the main element symbols: the tab forming device comprises a tab forming device 100, a first template 10, a first flow channel 11, a first containing groove 12, a first installing groove 13, a second template 20, a second flow channel 21, a second containing groove 22, a second installing groove 23, a sealing cover member 30, a first conversion head 40, a first channel 41, a first installing surface 42, a second conversion head 50, a second channel 51, a second installing surface 52, a glue injection member 60, a heating member 70, a template bearing structure 101, a tab piece 200, a first direction Z, a second direction Y and a third direction X.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "rear," and the like as used herein are for illustrative purposes only.

The term "vertical" is used to describe an ideal condition between two components. In a state of actual production or use, a state of approximately vertical may exist between the two components. For example, in combination with numerical descriptions, vertical may refer to an angle between two straight lines ranging from 90 ° ± 10 °, vertical may also refer to a dihedral angle between two planes ranging from 90 ° ± 10 °, vertical may also refer to an angle between a straight line and a plane ranging from 90 ° ± 10 °. Two components described as "perpendicular" may not be absolutely straight, planar, or may be substantially straight or planar, and a component may be considered "straight" or "planar" when viewed macroscopically as if the overall direction of extension were straight or planar.

The term "parallel" is used to describe an ideal condition between two components. In a state of actual production or use, a state of approximately parallel may exist between the two components. For example, in connection with numerical descriptions, parallel may refer to an angle between two straight lines ranging from 180 ° ± 10 °, parallel may also refer to a dihedral angle between two planes ranging from 180 ° ± 10 °, parallel may also refer to an angle between a straight line and a plane ranging from 180 ° ± 10 °. Two components described as "parallel" may not be absolutely straight, planar, or may be substantially straight or planar, and a component may be considered "straight" or "planar" when viewed macroscopically as if the overall direction of extension were straight or planar.

It should be noted that when a parameter is greater than, equal to, or less than a certain endpoint value, it should be understood that the endpoint value allows a tolerance of ± 10%, such as a being greater than 10, it should be understood to include a case where a is greater than 9, and also to include a case where a is greater than 11.

When a parameter is between A and B, it is understood that the range for that parameter is greater than or equal to A and less than or equal to B, e.g., in the range of 1 to 10, the range is understood to be greater than or equal to 1 and less than or equal to 10.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The application discloses utmost point ear forming device, utmost point ear forming device include first template, second template, first conversion head, second conversion head, injecting glue spare and closing cap spare. The first template is used for installing the pole lug pieces and is provided with a first flow channel. The second template is arranged on one side of the first template along the first direction, the second template is configured to move towards the first direction and the direction opposite to the first direction, and a second flow passage is arranged on one side of the second template facing the first template. In a first direction, a cover member is disposed at one side of the first template, the cover member being configured to be movable in the first direction and a direction opposite to the first direction. The first conversion head is connected with the first template and communicated with the first flow channel. The second conversion head is connected with the second template and communicated with the second flow passage. The glue injection piece is configured to be capable of moving towards a first direction and a direction opposite to the first direction. The first template is configured to be capable of moving relative to the cover piece to be connected with the cover piece or the second template, and when the first template is connected with the cover piece, the glue injection piece is communicated with the first conversion head, and the cover piece covers the first flow passage. When the first template is connected with the second template, the glue injection piece is communicated with the second conversion head, and the first flow passage is communicated with the second flow passage.

Some embodiments of the present application will be described below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 to 4, a tab forming apparatus 100 according to an embodiment of the present disclosure includes a first mold plate 10, a second mold plate 20, a first conversion head 40, a second conversion head 50, a glue injection member 60, and a sealing cover member 30. The first mold plate 10 is used for placing the pole tab 200, the first mold plate 10 is provided with a first flow channel 11, the second mold plate 20 is arranged on one side of the first mold plate 10 along the first direction Z, and a second flow channel 21 is arranged on one side of the second mold plate 20 facing the first mold plate 10. The capping member 30 is disposed at one side of the first mold plate 10 in the first direction Z. The second template 20, the cover 30 and the glue injection member 60 are all configured to be movable in a first direction Z and in a direction opposite to the first direction Z. When the first mold plate 10 and the capping member 30 are connected, the capping member 30 caps the first runner 11, and the glue injection member 60 injects the molten glue into the first runner 11 through the first conversion head 40, thereby completing the first glue injection. When the first mold plate 10 and the second mold plate 20 are connected, the glue injection member 60 injects the melted glue into the second runner 21 through the second switching head 50, and thus, the second glue injection is completed.

In some embodiments, referring to fig. 1, the tab forming apparatus 100 further includes a mold plate carrying structure 101, and the first mold plate 10, the second mold plate 20, the first conversion head 40, the second conversion head 50, the glue injection member 60, and the sealing member 30 may be integrated on the mold plate carrying structure 101.

Referring to fig. 2 and 3, the first template 10 can be moved relative to the cover 30 so that the first template 10 corresponds to the cover 30 in the first direction Z, or so that the first template 10 corresponds to the second template 20 in the first direction Z.

In one embodiment, the cover 30 is positioned on a side of the second template 20 in a third direction X, which is perpendicular to the first direction Z. The first template 10 is connected to a driving device, such as a pneumatic cylinder, a hydraulic cylinder, a rotary motor or a linear motor, so as to be capable of being driven to move relative to the cover member 30. The first template 10 can be moved to a station corresponding to the capping member 30 in the first direction Z so that the capping member 30 can be moved to contact the first template 10, and the first template 10 can be moved to a station corresponding to the second template 20 in the first direction Z so that the second template 20 can be moved to contact the first template 10. The first template 10 may move along a straight line or along an arc, and the specific movement mode is related to the type of the driving device connected to the first template 10, and is not described in detail herein.

In one embodiment, the first and

second templates

10 and 20 are correspondingly disposed in the first direction Z, and the cover 30 is connected to a driving device such as a pneumatic cylinder, a hydraulic cylinder, a rotary motor or a linear motor so as to be capable of being driven to move relative to the first template 10. The closure member 30 may be driven between the first template 10 and the second template 20 such that the closure member 30 and the first template 10 correspond in the first direction Z, thereby allowing the closure member 30 to be moved into engagement with the first template 10, and the closure member 30 may also be driven out of position between the first template 10 and the second template 20 to allow the second template 20 to be moved into engagement with the first template 10.

The first template 10 is used for placing a pole tab 200, and the pole tab 200 is a conductive metal strip of a pole tab, such as a strip made of a metal material such as copper, nickel-plated copper, and the like. The pole lug 200 is used to electrically connect with the pole piece of the cell. The pole tab 200 has a long side and a wide side perpendicular to each other. One end of the pole lug piece 200 in the long-edge extending direction is used for being connected with a pole piece, and the other end of the pole lug piece 200 in the long-edge extending direction is used for leading out the polarity of the pole piece. The tab sheet 200 is coated with tab glue (not shown) extending in the extending direction of the broad side of the tab sheet 200. The tab glue is used for being connected with the package edge sealing and sealing of the battery core, and the component of the tab glue can be PP (polypropylene), PI (polyimide) and PET (polyethylene glycol terephthalate). The tab glue is heated to a certain temperature to form the glue in the molten state, and the tab piece 200 and the tab glue form a tab.

The tabs are divided into positive tabs and negative tabs, the positive tabs include positive tab pieces, the negative tabs include negative tab pieces, and the tab pieces 200 with different polarities can be made of different metals, for example, the positive tab pieces 200 can be aluminum metal strips, and the negative tab pieces 200 can be nickel metal strips or copper nickel plated metal strips.

The pole piece of the battery cell comprises a positive pole piece, a negative pole piece and an isolation film arranged between the positive pole piece and the negative pole piece, wherein the positive pole piece, the negative pole piece and the isolation film can be arranged in a stacking mode and can also be arranged in a winding mode, and limitation is not performed here. The positive pole piece is connected with the positive pole lug, and the negative pole piece is connected with the negative pole lug in a welding mode.

Referring to fig. 2 to 4, a first flow channel 11 is disposed on a side of the first mold plate 10 facing the second mold plate 20, the first flow channel 11 is formed by a groove extending along a second direction Y on the first mold plate 10, and the second direction Y is perpendicular to the first direction Z and the third direction X in pairs. The polar lug 200 is placed on the side of the first template 10 facing the second template 20, and the extending direction of the long side of the polar lug 200 is parallel to the third direction X, so that the polar lug 200 is placed such that the extending direction of the polar lug glue after the first glue injection is performed is parallel to the extending direction of the wide side of the polar lug 200.

In some embodiments, referring to fig. 2, the first mold plate 10 is further provided with a first receiving groove 12 for receiving the pole tab 200, and the first receiving groove 12 may function to limit the displacement of the pole tab 200. The extending direction of the first receiving groove 12 is parallel to the third direction X, the first receiving groove 12 communicates with the first flow channel 11, and after the pole tab 200 is placed in the first receiving groove 12, the side of the pole tab 200 facing the first flow channel 11 can contact the first injected molten glue.

In some embodiments, referring to fig. 2, an end of the first flow channel 11 in the second direction Y may be further provided with a first mounting groove 13, and the first mounting groove 13 may be used for mounting the first conversion head 40. The shape of the first mounting groove 13 can be matched with the shape of the first conversion head 40, and the first conversion head 40 is limited in displacement.

Referring to fig. 2, 5 and 6, the first conversion head 40 is detachably mounted in the first mounting groove 13 during the first glue injection. The first conversion head 40 is provided with a first passage 41, the first passage 41 having an inlet and an outlet, the outlet of the first passage 41 communicating with the first flow passage 11. After the pole tab 200 is mounted, the cover member 30 is driven to move toward the first mold plate 10, so that the cover member 30 covers the first runner 11, and thus the cover member 30, the pole tab 200 and the first runner 11 form a space for injecting glue. The injection member 60 injects the melted tab compound into the first passage 41, and the tab compound enters from the inlet of the first passage 41 and flows into the first flow passage 11 from the outlet of the first passage 41.

Referring to fig. 3 and 4, a second flow channel 21 is disposed on a side of the second mold plate 20 facing the first mold plate 10, the second flow channel 21 is formed by a groove extending along the second direction Y on the second mold plate 20, and the first flow channel 11 and the second flow channel 21 are located at corresponding positions along the first direction Z, so that when the second mold plate 20 is engaged with the first mold plate 10, the first flow channel 11 and the second flow channel 21 can be merged and communicated.

In some embodiments, referring to fig. 3 and 4, the first mold plate 10 is further provided with a second receiving groove 22 for placing the polar lug 200, and the second receiving groove 22 corresponds to the first receiving groove 12, so that after the first mold plate 10 is connected to the second mold plate 20, the first receiving groove 12 and the second receiving groove 22 can jointly enclose a space for limiting the polar lug 200. The extending direction of the second receiving groove 22 is parallel to the third direction X, the second receiving groove 22 communicates with the second flow channel 21, and after the pole tab 200 is placed in the second receiving groove 22, the side of the pole tab 200 facing the second flow channel 21 can contact the molten glue injected for the second time.

In some embodiments, referring to fig. 3 and 4, the end of the second flow channel 21 in the second direction Y may further be provided with a second mounting groove 23, and the second mounting groove 23 may be used to mount the second conversion head 50. The shape of the second mounting groove 23 can be adapted to the shape of the first conversion head 40, and functions to limit the displacement of the second conversion head 50.

Referring to fig. 3, 4, 7 and 8, when glue is injected for the second time, the second conversion head 50 is detachably mounted in the second mounting groove 23, and the second mold plate 20 is connected to the first mold plate 10, so that the second flow channel 21 and the first flow channel 11 are communicated and form a glue injection space. The second switching head 50 is provided with a second passage 51, the second passage 51 having an inlet and an outlet, the outlet of the second passage 51 communicating with the second flow passage 21. The melted tab compound enters from the inlet of the second passage 51 and flows into the second flow channel 21 from the outlet of the second passage 51.

In some embodiments, referring to fig. 7 and 8, the second conversion head 50 is disposed opposite to the first conversion head 40 along the first direction Z, the first conversion head 40 is disposed toward a side of the second conversion head 50, and the second conversion head 50 is disposed toward a side of the first conversion head 40. During the second glue injection, the glue injection member 60 is communicated with the second channel 51, the second conversion head 50 is connected with the first conversion head 40, and the first channel 41 is communicated with the second channel 51. The first channel 41 and the second channel 51 are communicated, so that the tab glue melted during the second glue injection can be in contact with the tab glue in the first channel 41, and the combination effect of the tab glue injected twice is improved.

In some embodiments, referring to fig. 7 and 8, a side of the first transducing head 40 facing the second transducing head 50 is provided with a first mounting surface 42, and a side of the second transducing head 50 facing the first transducing head 40 is provided with a second mounting surface 52. The first mounting surface 42 may be a surface surrounding the inlet of the first passage 41, or may be a surface provided on the inlet side of the first passage 41, and the second mounting surface 52 may be a surface surrounding the communication between the second passage 51 and the first passage 41, or may be a surface provided on the communication between the second passage 51 and the first passage 41, which is not particularly limited herein. During the second glue injection, the glue injection member 60 is communicated with the second channel 51, and the first mounting surface 42 is in contact with the second mounting surface 52, so that the contact area between the first conversion head 40 and the second conversion head 50 can be increased, and the mounting stability between the first conversion head 40 and the second conversion head 50 is facilitated.

In some embodiments, referring to fig. 7 and 8, the first flow channel 11 and the second flow channel 21 both extend along the second direction Y, the number of the first transfer heads 40 is two, the two first transfer heads 40 are oppositely disposed along the second direction Y, the number of the second transfer heads 50 is two, and the two second transfer heads 50 are oppositely disposed along the second direction Y. So set up and to let first runner 11 and second runner 21 begin the injecting glue simultaneously at the both ends relative on second direction Y when the injecting glue, can improve the homogeneity of injecting glue efficiency and injecting glue, reduce the production of bubble.

The injection member 60 may be configured as a tube capable of communicating liquid, a plurality of tubes capable of communicating liquid, or a tube communicating a plurality of branches on a total injection tube, and is not limited specifically herein.

In some embodiments, referring to fig. 1 and 2, the tab forming apparatus 100 further includes a heating element 70, and the heating element 70 may act on any one or more of the first template 10, the second template 20, the tab sheet 200, and the cover member 30, which is not limited herein. The heating member 70 heats the first template 10 and the capping member 30 before the first glue injection, so that the glue injection can be smoother, and the uniformity of the glue injection can be improved. The heating member 70 heats the tab sheet 200 after the second glue injection is completed, so that the combination effect between the tab glue and the tab sheet 200 can be further improved. The heating member 70 may be provided as a metal pipe or a metal block that is energized to generate heat.

Referring to fig. 10, an embodiment of the present application further provides a tab forming method that can use the tab forming device in any of the above embodiments, where the tab forming method includes the following steps:

and a pole lug plate mounting step, namely, placing the pole lug plate in the first flow passage, and mounting a sealing cover part to cover the first flow passage.

And a first glue injection step, injecting the molten tab glue into the first conversion head through the glue injection piece, so that the molten tab glue flows into the first flow channel through the first conversion head.

And a step of gluing and fixing the tab, namely separating the sealing cover part from the first template after the tab glue in the first flow channel is solidified.

And (5) closing the die, namely controlling the second template to be connected with the first template, so that a second runner is arranged on one side of the tab piece, which is far away from the first runner.

And in the step of secondary glue injection, injecting the molten tab glue into the second conversion head through the glue injection piece, so that the molten tab glue flows into the second flow channel through the second channel.

This application can go out utmost point ear glue through above-mentioned step injection moulding on utmost point ear piece, has overcome the utmost point ear glue and has had the route that runs through and lead to the problem that electrolyte was revealed between the utmost point ear piece, has promoted the leakproofness of battery. And solidifying the molten tab glue after the first glue injection is finished, and then performing second glue injection, wherein the two glue injections are successively finished. The twice glue injection can reduce the glue injection space during single glue injection, thereby reducing the glue injection pressure required by injection molding and reducing the risk of bending the pole lug. The bottom of the glue injection space is filled firstly during glue injection, the glue injection pressure required by the top of the glue injection space is greater than that of the bottom of the glue injection space, the single glue injection space is reduced, the glue injection pressure required by different positions in the glue injection space is balanced, and therefore the uniformity of glue injection is improved.

In some embodiments, the tab sheet mounting step further comprises: the first template and the second template are heated to 50 ℃ to 130 ℃. The heating temperature includes 50 deg.C and 130 deg.C, and specifically can be 50 deg.C, 60 deg.C, 110 deg.C, 120 deg.C, 130 deg.C, etc. The tab glue is usually polypropylene particles, the melting temperature is 150-170 ℃, the first template and the second template are heated in advance, the time for the tab glue to solidify in the glue injection process can be reduced, and the risk that the molten tab glue is solidified in advance and is not beneficial to glue injection is reduced.

In some embodiments, the second glue injection step further includes: and waiting for the tab glue in the second flow channel to solidify, and heating the tab to 190-210 ℃. After the tab is heated, the tab glue part contacting with the tab can be softened and melted, so that the glue injection effect is further improved, and the associativity between the tab and the tab is improved.

In some embodiments, the second glue injection step further includes: and waiting for the solidification of the tab glue in the second flow channel, and cutting off the solidified tab glue at a position between the tab piece and the first conversion head.

In some embodiments, the time for waiting for the tab glue in the second flow channel to solidify is 20s-30 s. The tab glue can be solidified within the time range, the cutting step can be implemented, and the processing efficiency is improved.

In some embodiments, referring to fig. 9, the distance between the tab piece 200 and the first conversion head 40 is a, and satisfies a value of 4mm ≦ a ≦ 8 mm. In some embodiments, the distance between the position for cutting off the tab glue and the first conversion head 40 is b, and b is more than or equal to 1mm and less than or equal to 3 mm; the distance between the position for cutting off the tab glue and the tab piece 200 is c, and c is more than or equal to 3 and less than or equal to 5 mm.

Cutting off the tab adhesive within the above range can make the tab adhesive exceed the tab 200 in the extending direction of the wide side of the tab 200, and can also complete cutting without interference of the cutter, and reduce waste materials.

In some embodiments, the pressure for injecting the tab glue is 70MPa-100MPa, the glue injection speed is 200g/s-450g/s, and the glue injection time is 1.5s-2.5 s. The glue injection efficiency and the uniformity of glue injection can be improved.

In some embodiments, mounting the cover to cover the first flow passage further comprises: and fixing the sealing cover piece on one side of the pole lug piece, which is far away from the first flow channel, and enabling the sealing cover piece to be in contact with the pole lug piece. The arrangement can ensure that when glue is injected for the first time, the fused tab glue can be in contact with the end face of the tab piece on the long edge, and the installation of the sealing cover piece is also convenient.

In addition, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present application, and that suitable changes and modifications to the above embodiments are within the scope of the disclosure of the present application as long as they are within the true spirit and scope of the present application.

Claims

1. A tab forming device, comprising:

the first template is used for installing the pole lug pieces and is provided with a first flow channel;

a second template arranged at one side of the first template along a first direction, the second template being configured to be movable toward the first direction and a direction opposite to the first direction, a second flow passage being arranged at one side of the second template facing the first template;

a cover member disposed on a side of the first template in the first direction, the cover member configured to be movable in the first direction and a direction opposite to the first direction;

the first conversion head is connected with the first template and communicated with the first flow channel;

the second conversion head is connected with the second template and communicated with the second flow channel;

an injection member configured to be movable in the first direction and a direction opposite to the first direction;

the first template can move relative to the cover piece to be connected with the cover piece or the second template, when the first template is connected with the cover piece, the glue injection piece is communicated with the first conversion head, the cover piece covers the first flow channel, when the first template is connected with the second template, the glue injection piece is communicated with the second conversion head, and the first flow channel is communicated with the second flow channel.

2. The tab forming device according to claim 1, wherein the second converting head is disposed opposite to the first converting head along the first direction, the first converting head is disposed to be open to a side of the second converting head, the second converting head is disposed to be open to a side of the first converting head, and when the glue injection member is communicated with the second converting head, the second converting head is communicated with the first converting head.

3. The tab forming device as claimed in claim 1, wherein a first mounting surface is provided on a side of the first conversion head facing the second conversion head, and a second mounting surface is provided on a side of the second conversion head facing the first conversion head, and the first mounting surface and the second mounting surface are in contact when the glue injection member is communicated with the second conversion head.

4. The tab forming device as claimed in claim 1, wherein the first flow channel and the second flow channel each extend in a second direction perpendicular to the first direction, the number of the first switching heads is two, the first switching heads are disposed opposite to each other in the second direction, the number of the second switching heads is two, and the second switching heads are disposed opposite to each other in the second direction.

5. The tab forming device according to claim 1, further comprising a heating element acting on the first mold plate and/or the second mold plate.

6. A tab forming method using the tab forming device as claimed in any one of claims 1 to 5, comprising the steps of:

a pole lug installation step of placing the pole lug in the first flow passage and installing the cover member to cover the first flow passage;

a first glue injection step, injecting the melted tab glue into the first conversion head through the glue injection piece, and enabling the melted tab glue to flow into the first flow channel through the first conversion head;

a step of pole lug glue solidification, in which the sealing cover component is separated from the first template after the pole lug glue in the first flow channel is solidified;

a step of die assembly, wherein the second template is controlled to be connected with the first template, so that the second runner is arranged on one side of the tab piece, which is far away from the first runner;

and in the step of secondary glue injection, molten tab glue is injected into the second conversion head through the glue injection piece, so that the molten tab glue flows into the second flow channel through the second conversion head.

7. The tab forming method as claimed in claim 6, wherein the tab mounting step further comprises:

heating the first template and the second template to 50 ℃ -130 ℃.

8. The tab forming method according to claim 7, wherein the second glue injection step further comprises:

and waiting for the tab glue in the second flow channel to be solidified, and heating the tab piece to 190-210 ℃.

9. The tab forming method according to claim 7, wherein the second glue injection step further comprises:

and waiting for the solidification of the tab glue in the second flow channel, and cutting the solidified tab glue at a position between the tab piece and the first conversion head.

10. The method as set forth in claim 9, wherein the time for waiting for the solidification of the tab glue in the second flow channel is 20s-30 s.

11. The method for forming the electrode lug according to claim 9, wherein the distance between the electrode lug piece and the first conversion head is a, and a is more than or equal to 4mm and less than or equal to 8 mm.

12. The method for forming the tab as claimed in claim 11, wherein the distance between the tab glue cutting position and the first conversion head is b, and b is more than or equal to 1mm and less than or equal to 3 mm; the distance between the position for cutting off the tab glue and the tab piece is c, and c is more than or equal to 3 and less than or equal to 5 mm.

13. The method as claimed in claim 6, wherein the pressure of the tab glue injected is 70MPa-100MPa, the glue injection speed is 200g/s-450g/s, and the glue injection time is 1.5s-2.5 s.

14. The method of forming the tab as claimed in claim 6, wherein the mounting the cover member to cover the first flow passage further comprises: and fixing the sealing cover piece on one side of the pole lug piece, which is far away from the first flow channel, and enabling the sealing cover piece to be in contact with the pole lug piece.