CN219665519U

CN219665519U - Battery cell and battery cell welding device

Info

Publication number: CN219665519U
Application number: CN202320362442.5U
Authority: CN
Inventors: 刘世玉
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-09-12
Anticipated expiration: 2033-02-28

Abstract

The utility model provides a battery cell and a battery cell welding device, wherein the battery cell comprises a shell and a pole group arranged in the shell, the shell comprises a shell main body and a top cover arranged at the top of the pole group, the top cover comprises a base part and a pole column arranged at the top of the base part and extending upwards, and a clamping groove for clamping an external clamp is formed in the periphery of the pole column; the top of the shell main body is provided with an inward bent flange, the flange is superposed on the base, and a welding area is formed between the edge of the flange and the base. According to the battery cell, the top cover is arranged at the top of the pole group, the inward bent flange is arranged at the top of the shell main body, so that the welding area is formed between the edge of the flange and the base, the welding area is positioned at the top of the battery cell, the battery cell is not required to be rotated in the welding process, the improvement of the welding efficiency is facilitated, the top cover and the shell main body can be abutted tightly due to the fact that the upward pulling force is applied to the top cover due to the existence of the flange, and the stability and reliability of the welding quality are easy to guarantee.

Description

Battery cell and battery cell welding device

Technical Field

The utility model relates to the technical field of power battery manufacturing, in particular to an electric core. Meanwhile, the utility model also relates to a cell welding device.

Background

A blade battery comprises an aluminum shell and a positive and negative electrode top cover, and the lithium battery is required to be subjected to spot welding and peripheral welding on the aluminum shell and the top cover in the processing and assembling process. In the prior art, in the process of welding the battery cell, most of the welding is spot welding and peripheral welding from the side face, namely after the top cover and the aluminum shell are pressed, a welding area is formed at the position where the top cover contacts with the side face of the aluminum shell. At this time, the required press-fitting precision is higher, the press-fitting jig is also more complex, and the cost is higher.

In addition, in the welding process, after one side is welded, the battery cell is required to be rotated by 90 degrees, so that the lower side of the battery cell can be welded, and the improvement of welding efficiency is not facilitated. In addition, the process is limited by the relative arrangement form between the battery cell and the welding mechanism, so that the whole welding device is large in size and occupies more field space.

In addition, there is also a form of top surface welding in the prior art, that is, after the top cover is pressed with the aluminum case, a welding area is formed on the top surface of the battery cell. However, the press-fitting force required for welding the top surface is large, and the accuracy of the press-fitting jig is easily adversely affected after long-term use. And gaps may exist between the aluminum shell and the top cover after press mounting, and the welding quality is also adversely affected.

Disclosure of Invention

In view of this, the present utility model aims to provide a battery cell, so as to facilitate improvement of welding efficiency of a top cover of the battery cell and ensure welding quality.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

the battery cell comprises a shell and a pole group arranged in the shell, wherein the shell comprises a shell main body and a top cover arranged at the top of the pole group, the top cover comprises a base part and a pole column arranged at the top of the base part and extending upwards, and a clamping groove for clamping an external clamp is formed in the periphery of the pole column; the top of the shell main body is provided with an inward bent flange, the flange is superposed on the base, and a welding area is formed between the edge of the flange and the base.

Compared with the prior art, the utility model has the following advantages:

according to the battery cell, the top cover is arranged at the top of the pole group, the inward bent flange is arranged at the top of the shell main body, so that the welding area is formed between the edge of the flange and the base, the welding area is positioned at the top of the battery cell, and the battery cell does not need to be rotated in the welding process, so that the welding efficiency is improved. Moreover, the existence of the flanging leads to the application of upward tension to the top cover, so that the top cover and the shell main body can be abutted tightly, the required tensioning force is small, and the stability and reliability of the welding quality are easy to ensure.

Another object of the present utility model is to provide a device for welding a battery cell, which includes:

a work table;

the welding unit is arranged on the workbench;

the clamping unit clamps the battery cell and enables the battery cell to be in a vertical state, the clamping unit is arranged on the workbench in a sliding mode and is provided with a first working position close to the edge of the workbench and a second working position close to the welding unit, and the welding unit welds the welding area on the battery cell which is moved to the second working position;

and the upward pulling unit is arranged on the workbench, clamps the top cover on the battery cell which moves to the second working position, and applies upward pulling force to the top cover so as to enable the top cover to be abutted against the flanging.

Further, the clamping unit comprises a mounting plate arranged on the workbench in a sliding manner, and front limiting plates which are arranged on the mounting plate and distributed on two sides of the electric core in the thickness direction, one of the front limiting plates can be driven to be close to the electric core, and the electric core is abutted against the other front limiting plate.

Further, a sliding rail is arranged on the mounting plate, one of the front limiting plates is arranged on the sliding rail in a sliding mode, a propping piece which is arranged on the outer side of the front limiting plate in a sliding mode is arranged on the mounting plate, and the propping piece can move in the direction of the front limiting plate in a driving mode and drives the front limiting plate to prop against the battery cell.

Further, the clamping unit further comprises an end face limiting plate arranged on the mounting plate, an opening is formed in the end face limiting plate, the battery cell penetrates through the mounting plate to be abutted to the bottom of the end face limiting plate, and the welding area is exposed in the opening.

Further, the mounting plate comprises a first mounting plate arranged on the workbench and a second mounting plate arranged on the first mounting plate in a sliding manner along the width direction of the battery cell, and the front limiting plate is arranged on the second mounting plate;

the workbench is provided with side limiting plates which are arranged close to two sides of the battery cell in the width direction, one side limiting plate can drive the battery cell which is pushed to move to the second working position, so that the battery cell abuts against the other side limiting plate.

Further, the pull-up unit comprises a first driving unit arranged on the workbench and a clamping jaw assembly arranged at the power output end of the first driving unit, the clamping jaw assembly clamps the pole, and the first driving unit drives the clamping jaw assembly to move upwards to drive the base to abut against the flanging.

Further, the clamping jaw assembly comprises a second driving unit arranged at the power output end of the first driving unit and two clamping jaws arranged at intervals along the length direction of the pole, wherein the two clamping jaws are arranged at the power output end of the second driving unit;

the second driving unit drives the two clamping jaws to respectively abut against two ends of the pole in the length direction.

Further, the clamping jaw is provided with a propping part propping against the end part of the pole, and a stretching-in part stretching into the clamping groove.

Further, the welding unit comprises a triaxial linear module arranged on the workbench and a laser generator arranged at the power output end of the triaxial linear module, and the triaxial linear module drives the laser generator to travel along a preset track so as to weld the welding area.

According to the battery cell welding device, the battery cells are welded under the condition that the battery cells are kept vertically, so that the occupied area of the whole welding device is reduced, and the clamping unit is provided with the first working position close to the edge of the workbench and the second working position close to the welding unit, so that the welding operation is performed after the battery cells are mounted on the edge of the workbench, and the battery cells are convenient to take down after the battery cells are welded. Through being provided with the pull-up unit, be convenient for make the top cap upwards support the turn-ups of tight shell main part, be favorable to guaranteeing welding quality.

In addition, through setting up the terminal surface limiting plate, be convenient for realize the battery core in the orientation of height, be convenient for in subsequent welding process, guarantee welded quality. And through being equipped with the opening on terminal surface limiting plate, the border position at electric core top can the butt in the bottom of terminal surface limiting plate, and makes the welding area expose in the opening, convenient welding.

In addition, the clamping jaw is provided with a propping part propping against the end part of the pole and a stretching part stretching into the clamping groove, so that stable clamping of the top cover is facilitated.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 is an exploded view of a cell according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a battery cell according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of the overall structure of a die-bonding apparatus according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a structure of a clamping unit according to an embodiment of the present utility model;

fig. 5 is a schematic view of a part of a structure of a die-bonding apparatus according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram illustrating a structure of a pull-up unit according to an embodiment of the present utility model;

FIG. 7 is an enlarged view of portion A of FIG. 6;

fig. 8 is a schematic structural view of a clamping jaw according to an embodiment of the utility model.

Reference numerals illustrate:

1. a battery cell; 101. a case main body; 1011. flanging; 102. a top cover; 1021. a base; 1022. a pole; 1023. a clamping groove; 2. a work table; 3. a mounting plate; 301. a first mounting plate; 302. a second mounting plate; 303. a mounting part; 304. a tightening member; 4. a front limiting plate; 5. a first slide rail;

6. an end surface limiting plate; 601. an opening; 7. a second slide rail; 8. a buffer; 9. a side limiting plate; 10. a first mount; 11. a second mounting base; 12. a side pushing cylinder; 13. a third slide rail; 14. a feeding cylinder; 15. a connecting plate;

16. a first driving unit; 17. a second driving unit; 18. a clamping jaw; 1801. a connection part; 1802. an extending portion; 1803. a pressing part; 19. a first linear module; 20. a second linear module; 21. a third linear module; 22. a laser generator.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be noted that, if terms indicating an orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are presented, they are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present utility model, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in combination with specific cases.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

The present embodiment relates to a battery cell, and the battery cell 1 includes a housing and a pole group disposed in the housing, as shown in fig. 1 and 2. The housing comprises a housing main body 101 and a top cover 102 arranged at the top of the pole group, wherein the top cover 102 comprises a base 1021 and a pole 1022 arranged at the top of the base 1021 and extending upwards, and a clamping groove 1023 for clamping an external clamp is formed in the periphery of the pole 1022. The top of the case body 101 is provided with a flange 1011 bent inward, the flange 1011 is superposed on the base 1021, and a welding area is formed between the edge of the flange 1011 and the base 1021.

In the battery cell of this embodiment, the top cover 102 is disposed at the top of the pole group, and the top of the shell main body 101 is provided with the flange 1011 bent inwards, so that the welding area is formed between the edge of the flange 1011 and the base 1021, and then the welding area is located at the top of the battery cell 1, so that the battery cell 1 does not need to be rotated in the welding process, which is beneficial to the improvement of the welding efficiency. Moreover, the flange 1011 can exert smaller upward pulling force on the top cover 102 to realize the abutting of the top cover 102 and the shell main body 101, so that the required tensioning force is smaller, the tight contact between the top cover 102 and the shell is convenient to realize, and the stability and reliability of the welding quality are easy to ensure.

Example two

The present embodiment relates to a cell welding device that welds a cell 1 of the first embodiment, and includes a work table 2, a welding unit, a clamping unit, and a pull-up unit. The battery cell welding device of the embodiment has a simple structure, occupies a small area, can apply upward tension to the top cover 102, realizes the abutting of the top cover 102 and the flanging 1011, and is easy to ensure the welding quality.

Wherein the welding unit is arranged on the workbench 2. The clamping unit clamps the battery cell 1 and enables the battery cell 1 to be kept in a vertically placed state, the clamping unit is arranged on the workbench 2 in a sliding mode and is provided with a first working position close to the edge of the workbench 2 and a second working position close to the welding unit, and the welding unit welds a welding area on the battery cell 1 moving to the second working position. The pull-up unit is arranged on the workbench 2, clamps the top cover 102 on the battery cell 1 which moves to the second working position, and applies upward pulling force to the top cover 102 so as to enable the top cover 102 to be abutted against the flange 1011.

Based on the above overall description, as a preferred embodiment, as shown in fig. 3 to 8, in this embodiment, the clamping unit includes a mounting plate 3 slidably disposed on the table 2, and front limiting plates 4 disposed on the mounting plate 3 and distributed on both sides of the cell 1 in the thickness direction, wherein one front limiting plate 4 is driven to approach the cell 1, so that the cell 1 abuts against the other front limiting plate 4.

So set up, be convenient for realize the centre gripping to electric core 1 under vertical state, through making the battery guarantee carry out subsequent welding work under vertical state, be convenient for make and install welding set and occupy less area to when overcoming electric core 1 among the prior art and horizontally placing, the welding set size that exists is great, the big problem of area does benefit to the space utilization in the promotion factory.

In order to facilitate the sliding of the front limiting plate 4 on the mounting plate 3, the mounting plate 3 is provided with a sliding rail, one front limiting plate 4 of the front limiting plate is slidably arranged on the sliding rail, the mounting plate 3 is provided with a propping piece 304 positioned outside the front limiting plate 4 in a sliding arrangement, and the propping piece 304 can be driven to move towards the front limiting plate 4 and drive the front limiting plate 4 to prop against the battery cell 1.

Because the welding device is provided with the sliding rails at a plurality of positions, the sliding rail at the position is named as the first sliding rail 5 for convenience of distinguishing, and as shown in fig. 3 and 4, the front limiting plate 4 far away from one side of the welding unit is arranged on the first sliding rail 5 in a sliding manner. The mounting plate 3 is provided with a mounting part 303 positioned at the outer side of the front limiting plate 4 in a sliding manner, and the jacking piece 304 is a jacking screw penetrating through the mounting part 303, and can be close to or far away from the front limiting plate 4 by rotating the jacking screw.

Further, as shown in fig. 4, preferably, the clamping unit further includes an end surface limiting plate 6 provided on the mounting plate 3, an opening 601 is provided on the end surface limiting plate 6, the battery cell 1 is abutted against the bottom of the end surface limiting plate 6 through the mounting plate 3, and the welding area is exposed in the opening 601. Through setting up terminal surface limiting plate 6, be convenient for realize electric core 1 in the orientation of height, be favorable to guaranteeing welded quality in subsequent welding process. In addition, the end face limiting plate 6 is provided with the opening 601, and the edge position of the top of the battery cell 1 can be abutted against the bottom of the end face limiting plate 6, so that a welding area is exposed in the opening 601, and welding is facilitated.

As a further preferred embodiment, the mounting plate 3 includes a first mounting plate 301 provided on the table 2, and a second mounting plate 302 provided on the first mounting plate 301 in a sliding manner in the width direction of the battery cell 1, and the front limit plate 4 is provided on the second mounting plate 302. The workbench 2 is provided with side limiting plates 9 which are arranged close to two sides of the battery cell 1 in the width direction, and one side limiting plate 9 can drive the battery cell 1 which is pushed to move to the second working position, so that the battery cell 1 abuts against the other side limiting plate 9.

The side limiting plate 9 can realize the positioning of the battery cell 1 along the width direction of the battery cell 1 after the battery cell 1 moves to the second working position, thereby being beneficial to ensuring the subsequent welding quality. In specific implementation, as shown in fig. 4, the first mounting plates 301 are two of the two ends of the second mounting plates 302 along the width direction of the electric core 1, the two second mounting plates 302 are arranged on the workbench 2, the second mounting plates 302 on the two sides are both provided with the second sliding rails 7, and the first mounting plates 301 are arranged on the second sliding rails 7. The first mounting plate 301 is provided with dampers 8 on both sides in the sliding direction of the second mounting plate 302 to damp sliding of the second mounting plate 302 on the first mounting plate 301, thereby protecting the second mounting plate 302.

In addition, the side limiting plate 9 is arranged on the workbench 2 and is close to the second working position, the side limiting plate 9 on one side is fixedly arranged on the workbench 2 through the first mounting seat 10, the side limiting plate 9 on the other side is arranged on the power output end of the side pushing cylinder 12, the side pushing cylinder 12 is arranged on the second mounting seat 11 arranged on the workbench 2, the side pushing cylinder 12 pushes the side limiting plate 9 connected with the side pushing cylinder to be close to the battery cell 1, and the battery cell 1 is driven to move towards the other side limiting plate 9.

In addition, in order to facilitate sliding of the second mounting plate 302 on the table 2, the table 2 is provided with a third slide rail 13, as shown in fig. 3, the third slide rail 13 extends from the edge of the table 2 to a position close to the welding unit, and the second mounting plate 302 is provided on the third slide rail 13. And the workbench 2 is further provided with a feeding cylinder 14, and the second mounting plate 302 is connected with the power output end of the feeding cylinder 14 through a connecting plate 15, so that the clamping unit can move to the second working position after the battery cell 1 is arranged at the first working position close to the working edge by pushing of the feeding cylinder 14.

The pull-up unit comprises a first driving unit 16 arranged on the workbench 2 and a clamping jaw assembly arranged at the power output end of the first driving unit 16, the clamping jaw assembly clamps the pole 1022, and the first driving unit 16 drives the clamping jaw assembly to move upwards to drive the base 1021 to abut against the flanging 1011. As shown in fig. 5 and 6, the first driving unit 16 includes a cylinder disposed on the table 2 at a position close to the second working position, and a cylinder rod of the first driving unit 16 protrudes upward to be capable of driving the jaw assembly to move downward or upward.

Further, as shown in fig. 5, the jaw assembly includes a second driving unit 17 provided at a power output end of the first driving unit 16, and two jaws 18 provided at a power output end of the second driving unit 17 and spaced apart in a length direction of the pole 1022. The second driving unit 17 drives the two jaws 18 to abut against both ends of the pole 1022 in the length direction, respectively. In particular, the second driving unit 17 is a finger cylinder disposed at the power output end of the first driving unit 16, and the two clamping jaws 18 are connected to the power output end of the finger cylinder, and driven by the second driving unit 17, the two clamping jaws 18 approach or separate from each other to clamp or unclamp the top cover 102.

As a further preferred option, the clamping jaw 18 has a tightening portion 1803 that tightens against the end of the pole 1022, and an insertion portion 1802 that protrudes into the clamping slot 1023. So set up, be convenient for realize the stable centre gripping to top cap 102, combine the connecting portion 1801 that the clamping jaw 18 has and is connected with second drive unit 17 as shown in fig. 7 and 8, and set up at the terminal of connecting portion 1801 and two projecting portions 1802 of interval arrangement, the tight portion 1803 sets up between two projecting portions 1802, when clamping jaw 18 presss from both sides tight top cap 102, the projecting portions 1802 of both sides stretch into in the draw-in groove 1023 on the utmost point post 1022, the tight portion 1803 then butt is at the tip of utmost point post 1022.

As shown in fig. 3, the welding unit includes a triaxial linear module provided on the table 2, and a laser generator 22 provided at a power output end of the triaxial linear module, and the triaxial linear module drives the laser generator 22 to travel along a preset trajectory to weld the welding area. In particular, the triaxial linear module comprises a first linear module 19 arranged on the workbench 2 and extending along the width direction of the battery cell 1, a second linear module 20 arranged on the first linear module 19 and extending along the thickness direction of the battery cell 1, and a third linear module 21 arranged on the second linear module 20 and extending along the length direction of the battery cell 1. The laser generator 22 is disposed at the power output end of the third linear module 21.

When welding, after the focal length of the laser generator 22 is adjusted, the laser generator 22 can be started, so that the laser generator 22 is driven by the triaxial linear module to finish welding between the top cover 102 and the shell main body 101. In the welding, the portion blocked by the jaw 18 may be welded after the jaw 18 is opened.

The battery cell welding set of this embodiment, through making under the state that electric core 1 kept vertical placed, weld electric core 1, be convenient for reduce whole welding set's area, and through making the clamping unit have the first workstation that is close to workstation 2 edge, and be close to the second work of welding unit, be convenient for weld operation after electric core 1 is installed to workstation 2 edge, also conveniently take off electric core 1 after welding, in addition, through being provided with the pull-up unit, be convenient for make top cap 102 upwards support the turn-ups 1011 of tight shell main part 101, be favorable to guaranteeing welding quality.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. The utility model provides an electricity core, includes the shell and locates the utmost point group in the shell, its characterized in that:

the shell comprises a shell main body and a top cover arranged at the top of the pole group, the top cover comprises a base part and a pole column arranged at the top of the base part and extending upwards, and a clamping groove for clamping an external clamp is formed in the peripheral side of the pole column;

the top of the shell main body is provided with an inward bent flange, the flange is superposed on the base, and a welding area is formed between the edge of the flange and the base.

2. A cell welding apparatus for welding the cell of claim 1, comprising:

a work table;

the welding unit is arranged on the workbench;

3. The cell welding device according to claim 2, wherein:

the clamping unit comprises a mounting plate which is arranged on the workbench in a sliding manner, and front limiting plates which are arranged on the mounting plate and distributed on two sides of the electric core in the thickness direction, wherein one front limiting plate can be driven to be close to the electric core, and the electric core is abutted against the other front limiting plate.

4. A cell welding apparatus according to claim 3, wherein:

the battery cell is characterized in that a sliding rail is arranged on the mounting plate, one of the front limiting plates is arranged on the sliding rail in a sliding mode, a propping piece arranged on the outer side of the front limiting plate in a sliding mode is arranged on the mounting plate, and the propping piece (304) can move in the direction of the front limiting plate in a driving mode and drives the front limiting plate to prop against the battery cell.

5. A cell welding apparatus according to claim 3, wherein:

the clamping unit further comprises an end face limiting plate arranged on the mounting plate, an opening is formed in the end face limiting plate, the battery cell penetrates through the mounting plate to be abutted to the bottom of the end face limiting plate, and the welding area is exposed in the opening.

6. A cell welding apparatus according to claim 3, wherein:

the mounting plate comprises a first mounting plate arranged on the workbench and a second mounting plate arranged on the first mounting plate in a sliding manner along the width direction of the battery cell, and the front limiting plate is arranged on the second mounting plate;

7. The cell welding device according to any one of claims 2-6, wherein:

the pull-up unit comprises a first driving unit arranged on the workbench and a clamping jaw assembly arranged at the power output end of the first driving unit, the clamping jaw assembly clamps the pole, and the first driving unit drives the clamping jaw assembly to move upwards to drive the base to prop against the flanging.

8. The die-bonding apparatus according to claim 7, wherein:

the clamping jaw assembly comprises a second driving unit arranged at the power output end of the first driving unit and two clamping jaws arranged at intervals along the length direction of the pole, wherein the power output end of the second driving unit is provided with a plurality of clamping jaws;

9. The die-bonding apparatus according to claim 8, wherein:

the clamping jaw is provided with a propping part propping against the end part of the pole and an extending part extending into the clamping groove.

10. The cell welding device according to claim 2, wherein:

the welding unit comprises a triaxial linear module arranged on the workbench and a laser generator arranged at the power output end of the triaxial linear module, and the triaxial linear module drives the laser generator to travel along a preset track so as to weld the welding area.