阅读说明：本技术 定位夹具 (Positioning clamp ) 是由 刘兰 于秀东 王乾 肖曲 王文英 陈丽 刘昊 高云松 郭启军 向小群 高云峰 于 2020-12-31 设计创作，主要内容包括：本申请实施例提供了一种定位夹具,包括安装座；顶盖定位机构,设置于所述安装座上,用于放置并固定电池顶盖；连接片定位机构,可沿着靠近或者远离所述顶盖定位机构的方向活动设置于所述安装座上,用于压紧电池连接片；以及,第一驱动机构,设置于所述安装座上,用于驱动所述连接片定位机构沿着靠近或者远离所述顶盖定位机构的方向活动。本申请实施例提供的定位夹具,实现了电池顶盖与电池连接片之间的精确定位,保证电池顶盖与电池连接片的位置精准性以及稳定性,避免移位,进而提高后续焊接质量。(The embodiment of the application provides a positioning clamp, which comprises a mounting seat; the top cover positioning mechanism is arranged on the mounting seat and used for placing and fixing the battery top cover; the connecting sheet positioning mechanism can be movably arranged on the mounting seat along the direction close to or far away from the top cover positioning mechanism and is used for pressing the battery connecting sheet; and the first driving mechanism is arranged on the mounting seat and used for driving the connecting piece positioning mechanism to move along the direction close to or far away from the top cover positioning mechanism. The positioning fixture provided by the embodiment of the application realizes the accurate positioning between the battery top cover and the battery connecting sheet, ensures the position accuracy and stability of the battery top cover and the battery connecting sheet, avoids displacement and further improves the subsequent welding quality.)

1. Positioning fixture, its characterized in that: the method comprises the following steps:

a mounting seat;

the top cover positioning mechanism is arranged on the mounting seat and used for placing and fixing the battery top cover;

the connecting sheet positioning mechanism can be movably arranged on the mounting seat along the direction close to or far away from the top cover positioning mechanism and is used for pressing the battery connecting sheet; and the number of the first and second groups,

the first driving mechanism is arranged on the mounting seat and used for driving the connecting piece positioning mechanism to move along the direction close to or far away from the top cover positioning mechanism.

2. The positioning jig of claim 1, wherein: the top cover positioning mechanism comprises:

the datum plate is arranged on the mounting seat and used for placing the battery top cover, and a base is arranged on one side of the datum plate; and the number of the first and second groups,

and the jacking assembly is arranged on the base and used for jacking the battery top cover so as to press the battery top cover on the reference plate.

3. The positioning jig of claim 2, wherein: be provided with the fixed orifices on the base, the tight subassembly in top includes:

the positioning piece is used for pushing the battery top cover, and is provided with an adjusting hole extending in the direction close to or far away from the reference plate; and the number of the first and second groups,

the adjusting piece penetrates through the adjusting hole and is fixedly connected with the fixing hole.

4. The positioning jig of claim 1, wherein: the connection piece positioning mechanism includes:

the push plate is driven by the first driving mechanism to be movably arranged on the mounting seat along the direction close to or far away from the top cover positioning mechanism; and the number of the first and second groups,

and the pressing block is arranged on the push plate and used for pressing the battery connecting sheet.

5. The positioning jig of claim 4, wherein: the first drive mechanism includes:

the first driving piece is arranged on the mounting seat;

the first push rod is arranged on the first driving piece, driven by the first driving piece to move along the direction close to or far away from the push plate and used for pushing the push plate to move along the direction far away from the top cover positioning mechanism when moving along the direction close to the push plate; and the number of the first and second groups,

the first elastic piece is used for providing elastic force so as to push the pressing block to elastically press the battery connecting sheet when the first push rod moves along the direction far away from the push plate.

6. The positioning jig of claim 5, wherein: and a rotatable part for reducing friction is arranged at the contact position of the first push rod and the push plate.

7. The positioning jig of claim 4, wherein: the connecting piece positioning mechanism further comprises limiting assemblies for limiting the two opposite sides of the battery connecting piece, and the limiting assemblies are movably arranged on the mounting seat along the direction close to or far away from the top cover positioning mechanism.

8. The positioning jig of claim 7, wherein: the spacing subassembly includes:

the first limiting block is movably arranged on the mounting seat;

the second elastic piece is used for providing elastic force so that the first limiting block moves along the direction close to the top cover positioning mechanism to limit one side of the battery connecting sheet;

the second limiting block is movably arranged on the mounting seat;

the third elastic piece is used for providing elastic force so that the second limiting block moves along the direction close to the top cover positioning mechanism to limit the opposite side of the battery connecting sheet; and the number of the first and second groups,

the baffle is located the push pedal is kept away from the one end of top cap positioning mechanism and by the push pedal promotes in order to keep away from the direction activity of top cap positioning mechanism, the baffle is connected respectively first stopper with the second stopper.

9. The positioning jig of claim 1, wherein: the top cover positioning mechanism is movably arranged on the mounting seat in a lifting manner, the positioning fixture further comprises a second driving mechanism used for driving the top cover positioning mechanism to lift, and the second driving mechanism is arranged on the mounting seat.

10. The positioning jig of claim 9, wherein: the second driving mechanism comprises a second push rod and a second driving piece, the second push rod is used for pushing the top cover positioning mechanism to lift, and the second driving piece is arranged on the mounting seat and used for driving the second push rod to lift.

Technical Field

The invention belongs to the technical field of power batteries, and particularly relates to a positioning clamp.

Background

In the production process of the square-shell lithium battery, the connecting piece needs to be pre-fixed with the top cover in a spot welding mode, and then subsequent welding and other processes are carried out to realize the welding and fixing between the top cover and the connecting piece. It is also necessary to position the cap and the tab in a specific position prior to the welding operation of the cap and the tab. The positioning fixture of the related art generally performs positioning of the shape, and the positioning precision is low, so that displacement is easily caused during welding, and the welding quality is affected.

Disclosure of Invention

An object of the embodiment of the application is to provide a positioning fixture to solve the low technical problem who then influences welding quality of battery top cap and connection piece positioning accuracy.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions: there is provided a positioning jig including:

a mounting seat;

the top cover positioning mechanism is arranged on the mounting seat and used for placing and fixing the battery top cover;

the connecting sheet positioning mechanism can be movably arranged on the mounting seat along the direction close to or far away from the top cover positioning mechanism and is used for pressing the battery connecting sheet; and the number of the first and second groups,

the first driving mechanism is arranged on the mounting seat and used for driving the connecting piece positioning mechanism to move along the direction close to or far away from the top cover positioning mechanism.

Further, the top cover positioning mechanism comprises:

the datum plate is arranged on the mounting seat and used for placing the battery top cover, and a base is arranged on one side of the datum plate; and the number of the first and second groups,

and the jacking assembly is arranged on the base and used for jacking the battery top cover so as to press the battery top cover on the reference plate.

Further, be provided with the fixed orifices on the base, the tight subassembly in top includes:

the positioning piece is used for pushing the battery top cover, and is provided with an adjusting hole extending in the direction close to or far away from the reference plate; and the number of the first and second groups,

the adjusting piece penetrates through the adjusting hole and is fixedly connected with the fixing hole.

Further, the connecting piece positioning mechanism includes:

the push plate is driven by the first driving mechanism to be movably arranged on the mounting seat along the direction close to or far away from the top cover positioning mechanism; and the number of the first and second groups,

and the pressing block is arranged on the push plate and used for pressing the battery connecting sheet.

Further, the first drive mechanism includes:

the first driving piece is arranged on the mounting seat;

the first push rod is arranged on the first driving piece, driven by the first driving piece to move along the direction close to or far away from the push plate and used for pushing the push plate to move along the direction far away from the top cover positioning mechanism when moving along the direction close to the push plate; and the number of the first and second groups,

the first elastic piece is used for providing elastic force so as to push the pressing block to elastically press the battery connecting sheet when the first push rod moves along the direction far away from the push plate.

Further, a rotatable member for reducing friction is provided at a position where the first push rod contacts the push plate.

Furthermore, the connecting sheet positioning mechanism further comprises limiting assemblies for limiting the two opposite sides of the battery connecting sheet, and the limiting assemblies are movably arranged on the mounting seat along the direction close to or far away from the top cover positioning mechanism.

Further, spacing subassembly includes:

the first limiting block is movably arranged on the mounting seat;

the second elastic piece is used for providing elastic force so that the first limiting block moves along the direction close to the top cover positioning mechanism to limit one side of the battery connecting sheet;

the second limiting block is movably arranged on the mounting seat;

the third elastic piece is used for providing elastic force so that the second limiting block moves along the direction close to the top cover positioning mechanism to limit the opposite side of the battery connecting sheet; and the number of the first and second groups,

the baffle is located the push pedal is kept away from the one end of top cap positioning mechanism and by the push pedal promotes in order to keep away from the direction activity of top cap positioning mechanism, the baffle is connected respectively first stopper with the second stopper.

Furthermore, the top cover positioning mechanism is movably arranged on the mounting seat in a lifting manner, the positioning fixture further comprises a second driving mechanism for driving the top cover positioning mechanism to lift, and the second driving mechanism is arranged on the mounting seat.

Further, the second driving mechanism comprises a second push rod for pushing the top cover positioning mechanism to lift and a second driving piece arranged on the mounting seat and used for driving the second push rod to lift.

The positioning fixture provided by the embodiment of the application has the beneficial effects that: through setting up top cap positioning mechanism, can realize fixing of battery top cap, and the cooperation sets up connection piece positioning mechanism and a drive mechanism, a drive mechanism can drive connection piece positioning mechanism along being close to or keeping away from top cap positioning mechanism's direction activity, thereby can realize compressing tightly battery connection piece on battery top cap accurately, accurate positioning between battery top cap and the battery connection piece has been realized, guarantee the position accuracy and the stability of battery top cap and battery connection piece, avoid shifting, and then improve follow-up welding quality.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic perspective view of a positioning fixture provided in an embodiment of the present application;

FIG. 2 is a schematic view of another perspective view of FIG. 1;

fig. 3 is an exploded schematic view of a positioning fixture provided in an embodiment of the present application;

fig. 4 is a schematic perspective view of a mounting base according to an embodiment of the present disclosure;

fig. 5 is a schematic perspective view of a top cover positioning mechanism according to an embodiment of the present application;

FIG. 6 is a schematic partial structural view illustrating a top cover positioning mechanism mounted on a mounting base according to an embodiment of the present disclosure;

FIG. 7 is a schematic view of the alternate angular perspective structure of FIG. 6;

fig. 8 is a schematic perspective view of a connecting sheet positioning mechanism according to an embodiment of the present application;

FIG. 9 is an exploded view of a web positioning mechanism provided in accordance with an embodiment of the present application;

FIG. 10 is a partial schematic structural view of a connection piece positioning mechanism provided in an embodiment of the present application, mounted on a mounting base;

FIG. 11 is a schematic view of the alternate angular perspective structure of FIG. 10;

FIG. 12 is a schematic view of an assembly of a tab positioning mechanism and a battery tab provided in an embodiment of the present application;

fig. 13 is a schematic perspective view of a first driving mechanism according to an embodiment of the present disclosure;

fig. 14 is a schematic perspective view of a battery top cover and a battery connecting sheet according to an embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

10-a mounting seat; 11-a first slide rail; 12-a second slide rail; 13-a third slide rail; 14-a base; 15-a support; 20-a top cover positioning mechanism; 21-a reference plate; 211-a base; 22-a tightening assembly; 221-a positioning piece; 222-an adjustment member; 223-a regulation hole; 23-a guide rail; 30-a connecting sheet positioning mechanism; 31-a push plate; 311-inclined plane; 312 — a first slider; 32-briquetting; 33-a stop assembly; 331-a first stopper; 3311-second slide; 332-a second elastic member; 333-a second limiting block; 3331-third slider; 334-a third elastic element; 335-a baffle plate; 40-a first drive mechanism; 41-a first driving member; 42-a first push rod; 421-a rotatable member; 43-a first elastic member; 44-a buffer; 50-a second drive mechanism; 51-a second drive member; 52-a second push rod; 53-a fourth elastic member; 100-a battery top cover; 200-cell connection tab.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

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 of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 to fig. 3, a positioning fixture according to an embodiment of the present application will be described. The positioning fixture of the embodiment of the application is mainly used for positioning the battery top cover 100 and the battery connecting piece 200 before welding. Before positioning, the battery top cover 100 and the battery connecting plate 200 may be pre-fixed into a whole by spot welding, as shown in fig. 14. The positioning fixture comprises a mounting seat 10, a top cover positioning mechanism 20, a connecting sheet positioning mechanism 30 and a first driving mechanism 40. The top cover positioning mechanism 20 is disposed on the mounting seat 10 and used for placing and fixing the battery top cover 100, so as to position the battery top cover 100. The connecting sheet positioning mechanism 30 can be movably arranged on the mounting base 10 along a direction close to or far away from the top cover positioning mechanism 20, and is used for compressing the battery connecting sheet 200 to realize the positioning of the battery connecting sheet 200. The first driving mechanism 40 is disposed on the mounting base 10, and is used for driving the connecting piece positioning mechanism 30 to move in a direction close to or away from the top cover positioning mechanism 20. When the first driving mechanism 40 drives the connecting piece positioning mechanism 30 to move in the direction close to the top cover positioning mechanism 20, the clamping of the clamp can be realized, so that the battery connecting piece 200 can be stably positioned on the battery top cover 100. When the battery connecting piece 200 needs to be loosened, the first driving mechanism 40 only needs to drive the connecting piece positioning mechanism 30 to move in the direction away from the top cover positioning mechanism 20, and the battery connecting piece 200 can be loosened at the moment, so that the operation is very simple and convenient.

The positioning fixture that this application embodiment provided, through setting up top cap positioning mechanism 20, can realize battery top cap 100's fixing, and the cooperation sets up connection piece positioning mechanism 30 and first actuating mechanism 40, first actuating mechanism 40 can drive connection piece positioning mechanism 30 along being close to or keeping away from the direction activity of top cap positioning mechanism 20, thereby can realize compressing tightly battery connection piece 200 on battery top cap 100 accurately, accurate positioning between battery top cap 100 and battery connection piece 200 has been realized, guarantee battery top cap 100 and battery connection piece 200's position accuracy and stability, avoid shifting, and then improve follow-up welding quality.

Further, referring to fig. 5 and fig. 7, as a specific implementation of the positioning fixture provided in the embodiment of the present application, the top cover positioning mechanism 20 includes a datum plate 21 and a tightening assembly 22. The reference plate 21 is provided on the mount base 10 and is used to place the battery top cover 100. One side of the reference plate 21 is provided with a base 211, and the tightening assembly 22 is arranged on the base 211 and used for pushing the battery top cover 100 to press the battery top cover 100 on the reference plate 21. The top cover positioning mechanism 20 of the embodiment of the application can realize accurate positioning of the battery top cover 100 through the cooperation between the reference plate 21 and the tightening component 22.

In one embodiment of the present application, the base is provided with a fixing hole (not shown), the tightening assembly 22 includes a positioning member 221 and an adjusting member 222, the positioning member 221 is used for pushing the battery top cover 100, and the positioning member 221 is provided with an adjusting hole 223 extending in a direction approaching to or away from the reference plate 21. The adjusting member 222 may pass through the adjusting hole 223 and be coupled and fixed with the fixing hole. The battery top cover 100 is fixed through the matching of the adjusting piece 222 and the fixing hole, hard positioning is realized, the positioning accuracy is higher, and the battery top cover 100 can be prevented from shifting due to external force. Specifically, the adjusting member 222 may be a screw, and the fixing hole may be a threaded hole. By adjusting the position of the adjusting member 222 in the adjusting hole 223, the tightening assembly 22 can be adapted to the positioning of the battery top cover 100 with different thicknesses. When the battery top cover 100 needs to be fixed, the adjusting piece 222 can be separated from the fixing hole, then the battery top cover 100 is placed in the adjusting piece 222, and finally the adjusting piece 222 penetrates through the adjusting hole 223 and is connected and fixed with the fixing hole. It should be noted that the setting manner of the tightening unit 22 is not limited to this, for example, in another embodiment of the present application, the tightening unit 22 may also be automatically controlled, for example, a driving motor or a driving cylinder may be provided to clamp and release the battery top cover 100, or in yet another embodiment of the present application, the tightening unit 22 may also be provided with a spring to automatically press the battery top cover 100.

Further, referring to fig. 3, fig. 6, and fig. 7, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, the top cover positioning mechanism 20 is movably disposed on the mounting base 10 in a lifting manner, the positioning fixture further includes a second driving mechanism 50 for driving the top cover positioning mechanism 20 to move up and down, and the second driving mechanism 50 is disposed on the mounting base 10. After the top cover positioning mechanism 20 is lifted, a larger space is arranged above, so that the battery top cover 100 can be conveniently placed, and the structural interference with the connecting sheet positioning mechanism 30 is avoided. When the battery top cover 100 needs to be positioned, the second driving mechanism 50 drives the top cover positioning mechanism 20 to ascend to a preset position, the battery top cover 100 can be placed at the moment, and after the battery top cover 100 is fixed, the second driving mechanism 50 drives the top cover positioning mechanism 20 to descend so as to complete subsequent positioning operation of the battery connecting piece 200.

Further, referring to fig. 3, fig. 6 and fig. 7 together, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, the second driving mechanism 50 includes a second driving member 51 and a second push rod 52, and the second driving member 51 is disposed on the mounting base 10 and is used for driving the second push rod 52 to move up and down. The second push rod 52 is disposed on the second driving member 51, and is used for pushing the top cover positioning mechanism 20 to ascend and descend. When the battery top cover needs to be placed, the second driving element 51 drives the second pushing rod 52 to ascend, so that the second pushing rod 52 contacts with the top cover positioning mechanism 20 and pushes the top cover positioning mechanism 20 to ascend, and the battery top cover 100 can be placed at this time. After the battery top cover 100 is fixed on the top cover positioning mechanism 20, the second driving member 51 drives the second push rod 52 to descend, so that the top cover positioning mechanism 20 descends. Preferably, the second driving mechanism 50 may be a cylinder or a motor.

Further, referring to fig. 7, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, the second driving mechanism 50 may further include a fourth elastic member 53, where one end of the fourth elastic member 53 is connected to the top cover positioning mechanism 20, and the other end of the fourth elastic member 53 is connected to the mounting base 10, so as to provide an elastic force, so as to improve the lifting smoothness of the top cover positioning mechanism 20. Preferably, the fourth elastic member 53 may be a tension spring or a compression spring.

Further, referring to fig. 7, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, a guide rail 23 is disposed between the mounting base 10 and the top cover positioning mechanism 20, which can play a guiding role, and preferably, the guide rail 23 is a cross ball guide rail, which has a smaller installation size, and is beneficial to reducing the volume.

Further, referring to fig. 8 to 11 together, as a specific implementation of the positioning fixture provided in the embodiment of the present application, the connecting sheet positioning mechanism 30 includes a push plate 31 and a pressing block 32. The push plate 31 is driven by the first driving mechanism 40 to be movably disposed on the mount 10 in a direction approaching or separating from the top cover positioning mechanism 20. The pressing piece 32 is provided on the push plate 31 and serves to press the battery connecting tab 200. When the first driving mechanism 40 drives the pushing plate 31 to move in the direction close to the top cover positioning mechanism 20, the pressing block 32 is driven to move in the direction close to the top cover positioning mechanism 20, so that the battery connecting sheet 200 is pressed on the battery top cover 100. When the first driving mechanism 40 drives the pushing plate 31 to move along the direction far away from the top cover positioning mechanism 20, the pushing plate 31 simultaneously drives the pressing block 32 to move along the direction far away from the top cover positioning mechanism 20, so that the battery connecting sheet 200 is loosened, the operation is very simple and convenient, and the working efficiency can be effectively improved.

Further, referring to fig. 8 to 11 together, as an embodiment of the positioning fixture provided in the embodiment of the present application, the first driving mechanism 40 includes a first driving element 41, a first push rod 42 and a first elastic element 43. The first driving member 41 is disposed on the mounting base 10. The first push rod 42 is disposed on the first driving member 41 and driven by the first driving member 41 to move in a direction approaching or moving away from the push plate 31, and is used to push the push plate 31 to move in a direction moving away from the top cover positioning mechanism 20 when moving in a direction approaching the push plate 31, so that the pressing block 32 moves away from the battery connecting sheet 200. In one embodiment of the present application, the first pushing rod 42 is not connected to the pushing plate 31, and the first pushing rod 42 pushes the pushing plate 31 to move only when the first pushing rod 42 moves to a position contacting the pushing plate 31. The first elastic member 43 is used to provide an elastic force, so that when the first push rod 42 moves in a direction away from the push plate 31, the first elastic member 43 pushes the pressing piece 32 to elastically press the battery connecting piece 200. Through the arrangement of the first elastic member 43, a buffer effect can be provided, and the damage of the battery connecting piece 200 caused by the hard contact between the pressing block 32 and the battery connecting piece 200 is avoided. Of course, in other embodiments of the present application, the first elastic member 43 may not be provided, and the first pushing rod 42 may be directly connected and fixed with the pushing plate 31, so as to drive the pushing plate 31 to move in a direction approaching to or away from the top cover positioning mechanism 20. Preferably, the first driving member 41 may be a cylinder or a motor, and the first elastic member 43 may be a compression spring or an extension spring.

Further, referring to fig. 13, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, a rotatable component 421 is disposed at a position where the first push rod 42 contacts the push plate 31. For example, a bearing. Since the rolling friction is smaller than the sliding friction, the rotatable member 421 can reduce friction and noise and prolong the service life.

Further, referring to fig. 13, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, the first driving mechanism 40 is a lifting driving mechanism, and the first driving member 41 drives the first push rod 42 to lift, so that the first push rod 42 contacts with the push plate 31 and pushes the push plate 31 to move in a direction away from the top cover positioning mechanism 20, so that the fixture is in an open state. When the first driving member 41 drives the first push rod 42 to descend, so that the first push rod 42 is far away from the push plate 31, the first elastic member 43 drives the push plate 31 to move along the direction close to the top cover positioning mechanism 20 under the action of elastic force, and the battery connecting sheet is clamped. By setting the first driving mechanism 40 as the lifting driving mechanism, the volume can be effectively reduced, and the space can be saved. Of course, in other embodiments of the present application, the first driving mechanism 40 may also be a transverse driving mechanism, and the first pushing rod 42 may be horizontally close to or far from the pushing plate 31 by arranging the first pushing rod 42 horizontally with the pushing plate 31.

Further, referring to fig. 11, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, an end of the push plate 31 contacting the first push rod 42 is an inclined surface 311, and the inclined surface 311 is gradually inclined along a direction away from the push plate 31 from bottom to top. The inclined surface 311 is provided to play a role of a limit guide, and limit the stroke of the first push rod 42.

Further, referring to fig. 13, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, the first driving mechanism 40 further includes a buffer 44 connected to the first push rod 42, and the buffer 44 is configured to play a role of a buffer limit after the first push rod 42 moves to a predetermined position.

Further, referring to fig. 8 to 9 and 12, as a specific implementation of the positioning fixture provided in the embodiment of the present application, the connecting sheet positioning mechanism 30 further includes a limiting component 33, and the limiting component 33 is movably disposed on the mounting base 10 along a direction approaching to or departing from the top cover positioning mechanism 20. The limiting assemblies 33 are used for limiting the two opposite sides of the battery connecting sheet 200, so that the positioning accuracy can be improved.

Further, referring to fig. 8 to 9 together, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, the limiting component 33 includes a first limiting block 331, a second elastic member 332, a second limiting block 333, a third elastic member 334, and a baffle 335. The first stop block 331 is movably disposed on the mounting base 10. The second elastic member 332 is used for providing an elastic force to enable the first limiting block 331 to move in a direction close to the top cover positioning mechanism 20, so as to limit one side of the battery connecting piece 200. The second limiting block 333 is movably disposed on the mounting seat 10. The third elastic member 334 is used for providing an elastic force to enable the second limiting block 333 to move in a direction close to the top cover positioning mechanism 20, so as to limit the opposite side of the battery connecting piece 200. The baffle 335 is located at one end of the push plate 31 away from the top cover positioning mechanism 20 and is pushed by the push plate 31 to move in a direction away from the top cover positioning mechanism 20, and the baffle 335 is connected to the first stopper 331 and the second stopper 333 respectively. When the positioning clamp needs to be opened, the first driving mechanism 40 pushes the pushing plate 31 to move along the direction away from the top cover positioning mechanism 20, the pushing plate 31 pushes the baffle 335 to move along the direction away from the top cover positioning mechanism 20, and since the baffle 335 is connected with the first limiting block 331 and the second limiting block 333 respectively, the baffle 335 will drive the first limiting block 331 and the second limiting block 333 to move along the direction away from the top cover positioning mechanism 20 at the same time, so that the first limiting block 331 and the second limiting block 333 are away from the battery connecting piece 200. When the battery connecting piece 200 needs to be limited, the first driving mechanism 40 pushes the push plate 31 to move along the direction close to the top cover positioning mechanism 20, and at this time, under the elastic force action of the second elastic member 332 and the third elastic member 334, the first limiting block 331 and the second limiting block 333 move along the direction close to the top cover positioning mechanism 20 to limit the opposite sides of the battery connecting piece 200.

Preferably, in this embodiment of the application, the push plate 31 is non-fixedly connected to the baffle 335, and only when the push plate 31 moves to contact with the baffle 335, the baffle 335 is pushed to move in a direction away from the positioning mechanism, and the two stages of movement are separated, and the second elastic member 332 and the third elastic member 334 are matched to push the first stopper 331 and the second stopper 333 to limit the battery connecting piece 200, so that the buffer and protection functions are achieved, and the first stopper 331 and the second stopper 333 are prevented from scratching the battery connecting piece 200. Of course, the driving manner of the first limiting block 331 and the second limiting block 333 is not limited to this, for example, in another embodiment of the present application, the push plate 31 may also be fixedly connected to the baffle 335, and the baffle 335 is directly driven to move by the push plate 31. Or in another implementation of the present application, the first limiting block 331 and the second limiting block 333 may further be respectively provided with a driving mechanism for driving, which may also realize the movement of the first limiting block 331 and the second limiting block 333. Preferably, the second elastic member 332 and the third elastic member 334 may be compression springs or extension springs.

Further, referring to fig. 8 and 12 together, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, at least one of the first limiting block 331 and the second limiting block 333 is a long edge, which can clamp a side end of the battery connecting piece 200, and also can perform a shaping function, so as to improve the positioning accuracy of the battery connecting piece 200.

Further, referring to fig. 4 and fig. 9, as a specific implementation manner of the positioning fixture provided in the embodiment of the present application, the mounting seat 10 is respectively provided with a first slide rail 11, a second slide rail 12 and a third slide rail 13, the push plate 31 is provided with a first slider 312 matched with the first slide rail 11, the first stopper 331 is provided with a second slider 3311 matched with the second slide rail 12, and the second stopper 333 is provided with a third slider 3331 matched with the third slide rail 13. The slide block and the slide rail are matched, so that the function of limiting and guiding can be achieved.

Further, referring to fig. 4, as a specific implementation of the positioning fixture provided in the embodiment of the present application, the mounting base 10 includes a base 14 and a support 15 disposed on the base 14. The top cover positioning mechanism 20 and the connecting piece positioning mechanism 30 are respectively installed on the support 15, and the first driving mechanism 40 is installed on the base 14.

The working principle of the embodiment of the application is as follows:

firstly, the first driving mechanism 40 drives the connecting sheet positioning mechanism 30 to move in a direction away from the top cover positioning mechanism 20, so that the positioning clamp is in an open state;

then, the second driving mechanism 50 drives the top cover positioning mechanism 20 to ascend to a preset position, at this time, the spot-welded battery top cover 100 and the battery connecting sheet 200 can be placed on the reference plate 21, and the battery top cover 100 is fixed on the reference plate 21 through the adjustment of the tightening assembly 22;

then, the second driving mechanism 50 drives the top cover positioning mechanism 20 to descend and reset;

finally, the first driving mechanism 40 drives the connecting piece positioning mechanism 30 to move in a direction close to the top cover positioning mechanism 20, so that the top cover positioning mechanism 20 presses the battery connecting piece 200, and the clamping of the battery top cover 100 and the battery connecting piece 200 is realized.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.