CN217019030U - Welding tool for negative electrode cover plate of lithium ion battery - Google Patents

Abstract

The application discloses a welding frock for lithium ion battery negative pole apron includes: a battery carrier; a cover carrier connected to the battery carrier; the range of the cover plate carrier comprises a welding area; the welding structure is provided with a welding cavity, and the welding cavity corresponds to the welding area. This application is through setting up the welding chamber on welded structure, and when using, including the welding chamber wraps up the welding zone of connection piece and negative pole apron, can be with the copper welding sediment restriction that produces when welding in the within range in welding chamber, avoid the copper welding sediment to splash and get into inside or the negative pole apron of battery case, can improve the quality of battery.

Description

Welding tool for lithium ion battery negative cover plate

Technical Field

The application relates to the technical field of battery processing, in particular to a welding tool for a lithium ion battery negative electrode cover plate.

Background

A lithium ion battery is a secondary battery (rechargeable battery) that mainly operates by movement of lithium ions between a positive electrode and a negative electrode. In the processing process, the lithium ion battery needs to be welded with a negative electrode cover plate. The connection mode of the negative electrode cover plate is as follows: the pole ear in the battery shell extends out from the shell, the end part of the pole ear is connected with a connecting sheet, and the connecting sheet is required to be welded on the negative pole cover plate, so that the electric connection between the negative pole cover plate and the pole ear is realized.

In prior art, lithium ion battery negative pole apron generally adopts the mode of pressfitting formula to weld, place apron and battery on the tray tool in proper order, guarantee with the spring that welded structure compresses tightly connection piece and negative pole apron, quality problems such as rosin joint avoid appearing, but because at laser welding's in-process, it splashes to produce brazing sediment easily, directly splash to on the negative pole apron or inside the battery case, if at follow-up unable accurate these brazing sediment that detect out of detection station, very easily lead to the explosion of battery, cause the incident.

SUMMERY OF THE UTILITY MODEL

In view of this, the application provides a welding frock for lithium ion battery negative pole apron to solve current copper welding slag and splash to the negative pole apron on or the inside problem of battery case.

The application provides a welding frock for lithium ion battery negative pole apron includes: a battery carrier; a cover carrier connected to the battery carrier; the range of the cover plate carrier comprises a welding area; the welding structure is provided with a welding cavity, and the welding cavity corresponds to the welding area.

Optionally, the weld cavity is recessed within the weld structure.

Optionally, a retaining ring is arranged on the welding structure, and the welding cavity is recessed in an area of the welding structure, which is surrounded by the retaining ring.

Optionally, a projection is arranged on the lower side of the welding structure, and the welding cavity is recessed in the projection.

Optionally, a placing groove is formed in the battery carrier and used for placing the battery, and a notch is formed in the side wall of the placing groove.

Optionally, the device further comprises an upper cover plate corresponding to one side of the battery carrier for bearing the battery;

the welding structure is arranged on the surface of one side, which is relatively attached to the cover plate carrier, of the upper cover plate, and corresponds to the cover plate carrier.

Optionally, the distance between the welding structure and the upper cover plate is adjustable.

Optionally, the welding fixture further comprises a baffle plate, the baffle plate is arranged on the upper cover plate, and when the welding fixture is in a covering state, the baffle plate is located between the welding structure and the placing groove.

Optionally, the placing groove, the cover plate carrier and the welding structure are provided with a plurality of parts.

Optionally, a support is arranged on the battery carrier, and the cover plate carrier is arranged on the support.

This application, through set up the welding chamber on welded structure, when using, including the welding chamber wraps up the welding zone of connection piece and negative pole apron, can be with the copper welding sediment restriction that produces when welding in the within range in welding chamber, avoid the copper welding sediment to splash and get into inside or the negative pole apron of battery case, can improve the quality of battery.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present application;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1 according to an embodiment of the present application;

FIG. 3 is a schematic view of a welded structure portion according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional side view of a weld chamber according to an embodiment of the present disclosure;

FIG. 5 is a schematic cross-sectional side view of a weld chamber according to an embodiment of the present disclosure;

FIG. 6 is a schematic cross-sectional side view of a weld chamber according to an embodiment of the present disclosure.

In the figure: 10. a battery carrier; 11. a placement groove; 12. a notch; 13. a base plate; 20. a cover plate carrier; 21. a support; 22. a waist-shaped mounting hole; 30. an upper cover plate; 31. rotating and supporting; 40. welding a structure; 41. a welding cavity; 42. a baffle ring; 43. a bump; 45. a first threaded hole; 46. a second threaded hole; 50. and a baffle plate.

Detailed Description

The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings, 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. The embodiments described below and their technical features may be combined with each other without conflict.

Referring to fig. 1, the present application provides a welding tool for a negative cover plate of a lithium ion battery.

The welding tool comprises a battery carrier 10, a cover plate carrier 20 and a welding structure 40. A cover carrier 20 is connected to the battery carrier 10; the cover carrier 20 includes a welding area within its range; the welding structure 40 is provided with a welding cavity 41, and the welding cavity 41 corresponds to a welding area.

In this embodiment, the battery carrier 10 is used to carry the housing portion of the battery to be processed. Specifically, the battery carrier 10 is provided with a placement groove 11, and the battery case to be processed is placed in the placement groove 11. The pole ear in the battery shell extends out from one end of the battery shell bearing the negative pole cover plate, the end part of the pole ear is connected with a connecting sheet, and the connecting sheet is used for being welded with the negative pole cover plate of the battery.

Referring to fig. 1 and fig. 2, fig. 2 is an enlarged structural view of a portion a of fig. 1. The cover plate carrier 20 is connected to the battery carrier 10 and used for bearing a negative cover plate to be welded; in this embodiment, the cover carrier 20 is configured to have a shape corresponding to the size of the negative cover, and preferably, the cover carrier 20 is slightly larger than the negative cover, so as to support the negative cover; in this embodiment, the cover carrier 20 is provided as a rigid body, but may be provided as an elastic body in other embodiments.

In this embodiment, the cover carrier 20 is connected to a side surface of the battery carrier 10 carrying the battery case, and a bracket 21 is provided on the battery carrier 10, and the cover carrier 20 is mounted on the bracket 21, preferably, a mounting groove is formed on the bracket 21, and the cover carrier 20 is disposed in the mounting groove. In other embodiments, the cap carrier 20 may also be mounted directly on the battery carrier 10 or recessed inside the battery carrier 10.

In this embodiment, the welding area is a welding and bonding area of the connecting sheet and the negative electrode cover plate, and may be a spot-shaped bonding area, i.e. a welding spot area; it may also be a linear bonding zone along the edge of the web, i.e. a weld zone. Since the negative electrode lid is placed on the lid carrier 20, the welding area is also included in the range included in the lid carrier 20. Preferably, the welding area is provided in the middle of the deck carrier 20. When the feeding device is used, the negative electrode cover plate is placed on the cover plate carrier 20, and then the connecting pieces are attached to the negative electrode cover plate, so that the feeding process can be completed.

Referring to fig. 1, a welding structure 40 is disposed on a side surface of the upper cover plate 30 opposite to the cover plate carrier 20, and corresponds to the cover plate carrier 20; the welding structure 40 is a block structure, and can be matched with the cover plate carrier 20 to tightly press and fix the negative cover plate and the connecting sheet of the battery, thereby facilitating the welding.

Please refer to fig. 3 for a schematic diagram of a welding structure.

The welding structure 40 is provided with a welding cavity 41, and the welding cavity 41 corresponds to a welding area.

In this embodiment, the welding chamber 41 is arranged on the side of the welding structure 40 corresponding to the cover plate carrier, and may in particular be arranged at any position, preferably in the middle of the welding structure 40.

In this embodiment, the soldering chamber 41 is provided as a rectangular cavity, but in other embodiments, the soldering chamber 41 may be provided as a pillar, a mesa, or a hemisphere.

The lower side edge of the welding cavity 41 is on the same plane, so that a gap is not easy to remain when the welding cavity is attached to the negative electrode cover plate, and copper welding slag is prevented from splashing out of the welding cavity 41 from the gap.

The weld chamber 41 may partially or completely surround the weld area. Preferably, the welding chamber 41 completely surrounds the welding area, and the welding area is disposed in the middle of the welding chamber 41.

The welding chamber 41 encloses the welding area in the form of: the lower side of the welding structure 40 is pressed to the position where the negative cover plate and the connecting piece are overlapped, and the lower side of the welding cavity 41 is attached to the negative cover plate and the connecting piece to form a three-dimensional cavity with a closed lower side, so that the welding area between the negative cover plate and the connecting piece can be wrapped in the three-dimensional cavity.

When the welding structure is used specifically, a laser channel communicated with the welding cavity 41 is formed in the welding structure 40, and welding laser penetrates through the laser channel and then enters the welding cavity 41 to weld the negative cover plate and the connecting piece.

Because the welding structure 40 is pressed on the connecting sheet and the negative electrode cover plate of the battery, and the welding cavity 41 wraps the welding area of the connecting sheet and the negative electrode cover plate, copper welding slag generated during welding can be limited in the range of the welding cavity 41, the copper welding slag is prevented from splashing into the interior of the battery shell or the negative electrode cover plate, and the quality of the battery can be improved. After the welding is finished, since the temperature of the brazing slag is lowered and the ability to splash is no longer available, the cooled brazing slag can be removed without splashing.

Please refer to the schematic sectional side view of the soldering chamber in fig. 4. In one embodiment, the weld cavity 41 is recessed within the weld structure 40. In this way, the welding cavity 41 is directly formed in the welding structure 40, and when the welding cavity 41 is cylindrical, hemispherical or truncated cone-shaped, the welding cavity 41 can be conveniently machined.

Referring to the schematic sectional side view of the welding cavity of fig. 5, in an embodiment, a baffle ring 42 is disposed on the welding structure 40, and the welding cavity 41 is recessed in an area of the welding structure 40 that is enclosed by the baffle ring 42. Retainer ring 42 includes, but is not limited to, a ring shape so long as a closed containment area is formed.

Because the lower side of the welding cavity 41 and the negative electrode cover plate may not be tightly attached, copper welding slag may pass through the gap between the lower side of the welding cavity and the negative electrode cover plate and fall into the battery shell and the negative electrode cover plate to be welded, and therefore hidden danger of the battery is caused. The baffle ring 42 can seal the space between the lower side of the welding cavity 41 and the negative electrode cover plate, so that copper welding slag is prevented from splashing and entering the inside of a shell of the battery or the negative electrode cover plate, and the quality of the battery is improved. Illustratively, the retainer ring 42 may be made of a high temperature resistant elastomeric material, such as a vulcanized rubber material.

Referring to the schematic cross-sectional side view of the bonding cavity of fig. 6, in one embodiment, a bump 43 is disposed on the bonding structure 40, and the bonding cavity 41 is recessed in the bump 43.

In this embodiment, the weld chamber 41 is formed only in the projection 43, and no recess is required in the weld structure 40. And the projection 43 protrudes from the welding structure 40, when there is a foreign matter on the lower surface of the welding structure 40, if the welding structure 40 is directly pressed on the negative electrode cover plate, there may be a gap between the welding structure 40 and the negative electrode cover plate, and by providing the projection 43, even if there is a foreign matter on the lower surface of the welding structure 40, as long as the foreign matter is not on the lower surface of the projection 43, the projection 43 can be attached to the negative electrode cover plate, thereby sealing the welding chamber 41. Preferably, the shape of the weld cavity 41 is the same as the shape of the laser channel in the weld configuration 40.

Referring to fig. 1, the apparatus further includes an upper cover plate 30, where the upper cover plate 30 corresponds to a side of the battery carrier 10 carrying the battery and is used for carrying a welding structure 40; the welding structure 40 is disposed on a surface of the upper cover plate 30 opposite to the cover plate carrier 20, and corresponding to the cover plate carrier 20, and the welding structure 40 is driven to press the upper cover plate 30 downward to compress the negative electrode cover plate disposed on the cover plate carrier 20.

In this embodiment, one side of the upper cover plate 30 is rotatably connected to the battery carrier 10; the upper cover plate 30 is connected with the battery carrier 10 through an intermediate structure, specifically, the battery carrier 10 is fixedly connected with a rotary support 31 through a screw, and the upper cover plate 30 is rotatably connected with the rotary support 31 through a pin shaft. In this way, by detaching the rotary support 31, the upper cover plate 30 and the rotary support 31 can be detached together, facilitating the detachment and replacement of the upper cover plate 30.

In other embodiments, the upper cover plate 30 may be directly rotatably connected to the battery carrier 10 by a pin.

In other embodiments, the upper cover plate 30 can also be moved up and down relative to the battery carrier 10 by an external lifting device, such as a cylinder, so as to drive the welding structure 40 to press the negative cover plate placed on the cover plate carrier 20.

In this embodiment, the welding structure 40 is mounted on the upper cover plate 30 by means of a coupling part. In other embodiments, the welding structure 40 may be directly mounted on the upper cover plate 30 by welding or the like.

When the upper cover plate 30 is pressed down to a working position, the welding structure 40 is attached to the cover plate carrier 20;

preferably, the axis of the weld structure 40 and the axis of the cap carrier 20 coincide, i.e., are aligned.

Referring to fig. 1, as a preferred embodiment, a waist-shaped mounting hole 22 is formed on the bracket 21, and a screw is disposed in the waist-shaped mounting hole 22 to connect the bracket 21 to the battery carrier 10.

The position of the bracket 21 can be adjusted through the connection of the waist-shaped mounting hole 22, and then the position of the cover plate carrier 20 is adjusted, so as to meet the requirement of adjusting the position of a welding seam.

The method for adjusting the position of the bracket 21 comprises the following steps: the position of the cover plate carrier 20 can be manually moved by loosening the screws in the waist-shaped mounting holes 22, the cover plate carrier is adjusted to a required position, and the support 21 can be fixed again by screwing the screws in the waist-shaped mounting holes 22.

When the welding chamber 41 cannot wrap the welding area, the position of the cover plate carrier 20 can be adjusted in this way, and then the position of the welding area on the negative electrode cover plate is adjusted, so that the welding chamber 41 can wrap the welding area.

Referring to fig. 1 and 3, as a preferred embodiment, the distance between the welding structure 40 and the upper cover plate 30 is adjustable. In the present embodiment, the adjustment is performed by the following adjustment manner:

the welding structure 40 is provided with a first threaded hole 45 and a second threaded hole 46: screws are arranged in the first threaded holes 45, and the welding structure 40 is connected to the upper cover plate 30 through the screws; the second screw hole 46 is internally provided with a jack screw, and an end portion of the jack screw abuts on a surface of the upper cover plate 30.

Preferably, in the above arrangement, since three points not on the same straight line may define one plane, in order to ensure that the welded structure 40 is not deflected, more than 3 first threaded holes 45 and jackscrews not on the same straight line may be provided; likewise, more than 3 second threaded holes 46 and screws that are not in the same line may be provided.

When the welding structure 40 is located, the screw in the first threaded hole 45 pulls the welding structure 40 and the upper cover plate 30 tightly, and the position of the welding structure 40 can be fixed through the pushing force of the jackscrew in the second threaded hole 46 and the pulling force of the screw in the first threaded hole 45.

By adjusting the distance from the welding structure 40 to the upper cover plate 30, the tightness of the welding structure 40 in pressing the connecting sheet and the negative cover plate of the battery can be adjusted. Since the tab of the battery is attached to the upper side of the negative cover plate with the negative cover plate on the lower side in the specific welding, the attachment of the welding chamber 41 to the tab of the battery is relatively tight, but there is a gap between the welding chamber and the negative cover plate. By adjusting the position of the welding structure 40, on one hand, the tool can be suitable for compressing negative pole cover plates and connecting pieces of batteries with different thicknesses, and the application range of the tool can be expanded; on the other hand, the gap generated between the lower side of the welding cavity 41 and the negative cover plate due to untight adhesion can be further reduced, so that copper welding slag is prevented from splashing out of the welding cavity 41 and falling into the shell of the battery and the negative cover plate to be welded, and the hidden danger of the battery is further caused.

In other embodiments, the distance between the weld structure 40 and the upper cover plate 30 may be adjusted by compression and extension of a spring.

Referring to fig. 1, as a preferred embodiment, a plurality of placement grooves 11, cover carriers 20 and welding structures 40 are provided. By the mode, a plurality of batteries can be processed at one time, and the processing efficiency is improved.

Referring to fig. 1, in order to connect the tool to other objects, a bottom plate 13 is connected to the lower side of the battery carrier 10, and the tool is installed at a desired position through the bottom plate 13.

In this embodiment, the base plate 13 and the battery carrier 10 are fixedly connected. In other embodiments, the connection between the base plate 13 and the battery carrier 10 is not limited to a fixed connection, but can also be configured as a lockable sliding connection or/and a lockable rotating connection, in which way the user can adjust the position of the battery carrier with the base plate 13 fixed to suit the requirements of flexible manufacturing.

Referring to fig. 1, as a preferred embodiment, the apparatus further includes a baffle 50, the baffle 50 is disposed on the upper cover plate 30, and when the welding tooling is in a closed state, the baffle 50 is located between the welding structure 40 and the placing groove 11.

When the battery works, after the upper cover plate 30 is closed, the edge of the baffle 50 is attached to the connecting sheet, so that a welding area can be separated from the battery, and welding spatters can be further prevented from entering the battery.

Referring to fig. 1, as a preferred embodiment, a notch 12 is formed on a side wall of the placing slot 11. The battery is taken and placed manually from the notch 12, so that the efficiency of taking and placing the battery can be improved, and the labor productivity is improved.

As a preferred embodiment, the upper cover plate 30 and the battery carrier 10 may be attracted by a magnet, so that the welding structure 40 may press the connecting sheet for fixing the negative cover plate and the battery.

As a preferred embodiment, a handle is provided on the upper cover 30 to facilitate manual opening and closing of the upper cover 30.

The working principle is as follows:

placing the negative cover plate of the battery on the upper side of the cover plate carrier 20; placing the shell of the battery in a placing groove 11 of a battery carrier 10, and attaching a connecting sheet of the battery and a negative electrode cover plate; moving the upper cover plate 30 to close the upper cover plate 30 and the battery carrier 10, and meanwhile, matching and pressing the connecting sheet and the negative cover plate by the welding structure 40 and the cover plate carrier 20; the laser passes through the laser passage on the upper cover plate 30 and the laser passage on the welding structure 40 into the welding cavity 41 to weld the connecting piece and the negative cover plate. Copper welding slag generated by welding is limited in the welding cavity 41, after the welding is finished, the copper welding slag is cooled in the welding cavity 41, the upper cover plate 30 is opened, the battery shell, the connecting plate and the negative electrode cover plate which are welded together can be taken out, and then the cooled copper welding slag is periodically removed.

Although the application has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. This application is intended to embrace all such modifications and variations and is limited only by the scope of the appended claims. In particular regard to the various functions performed by the above described components, the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component, e.g., that is functionally equivalent, even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the specification.

That is, the above description is only an embodiment of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and the drawings, such as mutual combination of technical features between various embodiments, or direct or indirect application to other related technical fields, are included in the scope of the present application.

In addition, in the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be considered as limiting the present application. In addition, structural elements having the same or similar characteristics may be identified by the same or different reference numerals. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The previous description is provided to enable any person skilled in the art to make and use the present application. In the foregoing description, various details have been set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Claims (10)

1. The utility model provides a welding frock for lithium ion battery negative pole apron which characterized in that includes:

a battery carrier (10);

a cover carrier (20) connected to the battery carrier (10); the range of the cover plate carrier (20) comprises a welding area;

the welding structure (40) is provided with a welding cavity (41), and the welding cavity (41) corresponds to a welding area.

2. Welding tool according to claim 1, characterized in that the welding cavity (41) is recessed in the welding structure (40).

3. Welding tool according to claim 2, characterized in that a retaining ring (42) is arranged on the welding structure (40), and the welding cavity (41) is recessed in an area of the welding structure (40) that is surrounded by the retaining ring (42).

4. Welding fixture according to claim 1, characterized in that a projection (43) is provided on the underside of the welding structure (40), and the welding cavity (41) is recessed in the projection (43).

5. The welding tooling of claim 1, wherein a placing groove (11) is arranged on the battery carrier (10) and used for placing a battery, and a notch (12) is formed in the side wall of the placing groove (11).

6. The welding tool of claim 5, wherein:

the device also comprises an upper cover plate (30), wherein the upper cover plate (30) corresponds to one side of the battery carrier (10) for bearing the battery;

the welding structure (40) is arranged on one side surface of the upper cover plate (30) which is relatively attached to the cover plate carrier (20) and corresponds to the cover plate carrier (20).

7. Welding tool according to claim 6, characterized in that the distance between the welding structure (40) and the upper cover plate (30) is adjustable.

8. The welding fixture according to claim 6, further comprising a baffle (50) disposed on the upper cover plate (30), wherein the baffle (50) is located between the welding structure (40) and the placement groove (11) when the welding fixture is in a closed state.

9. The welding tool according to claim 7, characterized in that a plurality of placing grooves (11), cover plate carriers (20) and welding structures (40) are arranged.

10. The welding tool according to claim 1, characterized in that a bracket (21) is arranged on the battery carrier (10), and the cover carrier (20) is arranged on the bracket (21).

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