CN117324757A

CN117324757A - Current collecting disc welding jig, current collecting disc welding device and current collecting disc welding method

Info

Publication number: CN117324757A
Application number: CN202311631607.5A
Authority: CN
Inventors: 龚国华
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-12-01
Filing date: 2023-12-01
Publication date: 2024-01-02
Anticipated expiration: 2043-12-01
Also published as: CN117324757B

Abstract

The embodiment of the application provides a current collecting disc welding jig, a current collecting disc welding device and a current collecting disc welding method. The compressing member is provided with a receiving groove for receiving the collecting tray. The compressing piece is provided with an air passage and a plurality of avoiding grooves. The avoidance grooves are distributed on the peripheral side of the gas passing channel so as to expose the area to be welded on the collecting disc. Each avoidance groove is communicated with the overair channel. One end of the air inlet channel is communicated with the air source, and the other end of the air inlet channel is communicated with the air passing channel, so that the protective gas in the air inlet channel can flow to the avoidance groove through the air passing channel. According to the current collecting disc welding jig, the protective gas is controlled to be blown to the to-be-welded area on the periphery side by the center of the current collecting disc, so that the failure problems of welding pinholes, explosion points and the like can be avoided to a certain extent, potential safety hazards such as scalding and burning of an isolating film are avoided, generated welding slag and the like are also facilitated to be blown out towards the outer side of the current collecting disc, and further welding quality and safety performance are improved.

Description

Current collecting disc welding jig, current collecting disc welding device and current collecting disc welding method

Technical Field

The application relates to the technical field of laser welding, in particular to a current collecting disc welding jig, a current collecting disc welding device and a current collecting disc welding method.

Background

This section is intended to provide a background or context for embodiments of the present application. The description herein is not admitted to be prior art by inclusion in this section.

In the process of welding the current collecting disc onto the battery core, protective gas needs to be blown into the to-be-welded area to improve welding quality, and in the related art, the protective gas adopts a paraxial blowing mode, so that uneven distribution of protective gas flow in partial welding areas is easily caused, failure problems such as welding pinholes or explosion points occur, potential safety hazards such as isolating film scalding/burning exist, and poor welding quality can be caused.

Disclosure of Invention

In view of this, the embodiment of the application expects to provide a current collecting tray welding jig, a current collecting tray welding device and a current collecting tray welding method, and the protection gas can evenly cover the area to be welded, improves welding quality and security performance.

To achieve the above object, a first aspect of embodiments of the present application provides a welding fixture for a current collecting plate, including:

the compression piece is provided with an accommodating groove for accommodating the current collecting disc, the compression piece is provided with an air passage and a plurality of avoidance grooves, the avoidance grooves are distributed on the periphery of the air passage so as to expose a region to be welded on the current collecting disc, and the avoidance grooves are communicated with the air passage;

And one end of the air inlet channel is communicated with the air source, and the other end of the air inlet channel is communicated with the air passing channel, so that the protective gas in the air inlet channel can flow to the avoiding groove through the air passing channel.

The current collecting disc welding jig that this application embodiment provided, including compressing tightly piece and air inlet channel. Be provided with on the compact part and dodge the groove through dodging the groove setting in the week side of crossing the gas passage with each, the air supply passes through the inlet channel intercommunication with crossing the gas passage, so, the shielding gas that the air supply provided can get into the gas passage through the inlet channel, dodge the groove from crossing gas passage flow direction week side again to cover and wait to weld the region, that is to say, blow to the region of waiting of week side by the center of mass flow disk through control shielding gas, can make shielding gas evenly cover wait to weld the region, can avoid appearing the inefficacy problem such as welding pinhole, explosion point to a certain extent, and avoid potential safety hazard such as barrier film scald, burn, and then improved welding quality and security performance. In addition, the protective gas is blown to the to-be-welded area on the periphery from the center of the collecting disc, so that dust or other sundries in the to-be-welded area can be removed, and generated welding slag and the like can be blown to the outer side of the collecting disc in the welding process, so that the welding quality is further improved.

In some embodiments, the air passage extends along the height direction of the pressing member, and a through hole communicated with each avoidance groove is formed in the side wall of the air passage.

The gas passing channel is arranged to extend along the height direction of the pressing piece, so that the inflow of the shielding gas is facilitated, and the shielding gas flowing into the gas passing channel is uniformly blown to each avoiding groove.

In some embodiments, the centerline of the overgas passage coincides with the centerline of the compression member.

The gas passage is arranged at the center of the pressing piece, so that the arrangement of the to-be-welded area on the collecting disc and the uniform blowing of the protective gas flowing into the gas passage to the avoiding grooves are facilitated.

In some embodiments, the receiving slot is open toward the bottom of the compression member, and each of the relief slots extends through a top wall of the receiving slot.

The receiving groove is open toward the bottom of the compression member, and the collecting tray can be placed into the receiving groove from the open position of the bottom of the compression member. One end of the battery cell can also extend into the accommodating groove through the opening of the bottom of the pressing piece, so that one end of the battery cell is propped against the current collecting disc, and the current collecting disc is propped against the top wall of the accommodating groove. Each dodge groove penetrates through the top wall of the containing groove, so that the laser welding machine can be arranged above the current collecting disc welding jig, laser can irradiate the to-be-welded area of the current collecting disc through the dodge groove penetrating through the top wall of the pressing piece, and the to-be-welded area is used for welding the current collecting disc to the battery cell.

In some embodiments, the relief groove has a dimension in a radial direction of the compression member that is greater than a dimension of the relief groove in a circumferential direction of the compression member.

Through the long border radial setting of dodging the groove, dodge the minor face in groove along circumference setting, more be favorable to the shielding gas to blow to dodge the groove to flow along dodging the groove. In addition, dodge the radial setting in the long border in groove, can improve the condition that shielding gas backward flow to a certain extent.

In some embodiments, the top end of the gas passage is a closed end and the bottom end of the gas passage is an open end.

By setting the top end of the gas passage as a closed end, the bottom end of the gas passage is set as an open end. So, shielding gas can flow in through the bottom, and can directly blow to the district of waiting to weld through the air passage that the mass flow dish formed and dodge the groove, has improved shielding gas's utilization ratio, and can reduce the resistance to mass flow dish welding jig and laser head as far as possible, has improved welded convenience. Secondly, through setting the top of passing through the gas passageway to the blind end, the blind end can block by the shielding gas of bottom entering, more is favorable to the shielding gas flow direction to dodge the groove.

In some embodiments, the current collecting disc welding jig further includes a base located below the pressing member, the base is disposed opposite to the pressing member, and clamps the current collecting disc and the battery cell therebetween, so that one end of the battery cell abuts against the current collecting disc, and the base is formed with the air inlet channel.

So, through setting up the base, with mass flow dish and electric core centre gripping between compressing tightly piece and base to compress tightly the one end of electric core on the mass flow dish, avoid taking place the displacement at welded in-process, so, can make to weld the mass flow dish to the electric core. In addition, through being formed with the inlet channel on the base, shielding gas can get into the air passage through the inlet channel who forms on the base, reduces as far as possible to the blocking of mass flow dish welding jig and laser head, and does not need parts such as extra setting up intake pipe, improves assembly efficiency and reduce cost.

In some embodiments, the air inlet channel comprises a first sub-air channel extending along the radial direction of the base and a second sub-air channel extending along the height direction of the base, one end of the first sub-air channel is communicated with an air source, and the other end of the first sub-air channel is communicated with the second sub-air channel.

Therefore, the protection gas of the gas source is communicated with the first sub-gas passage from one radial side, and the communication between the gas inlet passage and the gas source is facilitated. The shielding gas flows along the radial direction of the base and then flows along the height direction of the base.

In some embodiments, the flow cross-sectional area of the second sub-airway is greater than the flow cross-sectional area of the first sub-airway.

It is understood that the flow cross-sectional area of the second sub-air passage is greater than the flow cross-sectional area of the first sub-air passage. Because the extension directions of the first sub-air passage and the second sub-air passage are different, the air flow flows from the first sub-air passage to the second sub-air passage, which is beneficial to reducing the flow resistance of the protective gas.

In some embodiments, a centerline of the second sub-airway coincides with a centerline of the base.

The second sub air passage is arranged at the center of the base, so that the arrangement of the air inlet passage and the communication between the air inlet passage and the air passing passage are facilitated.

In some embodiments, the outer side wall of the base is provided with a connecting portion in a protruding manner, the connecting portion is used for being communicated with an air source, and a space in the connecting portion forms part of the air inlet channel.

Through being provided with connecting portion at the lateral wall protrusion of base, be favorable to with the air supply intercommunication, do not need parts such as additional setting up intake pipe, improve assembly efficiency and reduce cost.

In some embodiments, the electric core is provided with an air outlet channel, the collecting disc is provided with an air outlet hole, and the protective gas in the air inlet channel flows through the air outlet channel, the air outlet hole and the air passing channel in sequence and then flows to the avoiding groove.

Therefore, the protective gas in the air inlet channel flows through the air outlet channel, the air outlet hole and the air passing channel in sequence and then flows to the avoiding groove, so that the protective gas is blown to the to-be-welded area on the periphery side from the center of the collecting disc, an air inlet pipe is not required to be additionally arranged, the assembly efficiency is improved, and the cost is reduced.

A second aspect of embodiments of the present application provides a current collecting tray welding apparatus, including:

a mounting base;

the current collecting disc welding jig is arranged on the mounting seat;

the laser welding machine is movably arranged at one side of the current collecting disc welding jig, and laser emitted by the laser welding machine can irradiate the region to be welded of the current collecting disc through the avoidance groove and is used for welding the current collecting disc to the battery cell;

and the air source is communicated with the air inlet channel of the collecting disc welding jig.

The current collecting disc welding device that this application embodiment provided, current collecting disc welding jig include compress tightly piece and air inlet channel. Be provided with on the compact part and dodge the groove through dodging the groove setting in the week side of crossing the gas passage with each, the air supply passes through the inlet channel intercommunication with crossing the gas passage, so, the shielding gas that the air supply provided can get into the gas passage through the inlet channel, dodge the groove from crossing gas passage flow direction week side again to cover and wait to weld the region, that is to say, blow to the region of waiting of week side by the center of mass flow disk through control shielding gas, can make shielding gas evenly cover wait to weld the region, can avoid appearing the inefficacy problem such as welding pinhole, explosion point to a certain extent, and avoid potential safety hazard such as barrier film scald, burn, and then improved welding quality and security performance. In addition, the protective gas is blown to the to-be-welded area on the periphery from the center of the collecting disc, so that dust or other sundries in the to-be-welded area can be removed, and generated welding slag and the like can be blown to the outer side of the collecting disc in the welding process, so that the welding quality is further improved.

A third aspect of the embodiments of the present application provides a method for welding a current collecting disc, including:

the welding device for the current collecting disc is applied to the current collecting disc welding device for welding the current collecting disc to the battery core, the welding device for the current collecting disc comprises a welding jig for the current collecting disc, a laser welding machine and an air source for providing protective gas, the welding jig for the current collecting disc comprises an air inlet channel and a pressing piece provided with a containing groove for containing the current collecting disc, the pressing piece is provided with an air passing channel and a plurality of avoiding grooves, the avoiding grooves are distributed on the periphery of the air passing channel so as to expose a to-be-welded area on the current collecting disc, the avoiding grooves are communicated with the air passing channel, one end of the air inlet channel is communicated with the air source, and the other end of the air inlet channel is communicated with the air passing channel, so that the protective gas in the air inlet channel can flow to the avoiding grooves through the air passing channel;

the current collecting disc welding method comprises the following steps:

determining welding positions of the battery cell and the current collecting disc in the current collecting disc welding jig;

starting the gas source, and enabling the protective gas to flow into the gas passing channel from the gas inlet channel and blow the protective gas to the to-be-welded area on the peripheral side from the gas passing channel;

And starting the laser welding machine, and irradiating the region to be welded of the current collecting disc by laser emitted by the laser welding machine, so as to weld the current collecting disc to the battery cell.

In the welding process, after the welding position of the battery cell and the current collecting disc in the current collecting disc welding jig is determined, starting an air source, wherein the air source is used for providing protective gas, the protective gas is blown to a to-be-welded area on the periphery side from the center of the current collecting disc, so that the protective gas covers the to-be-welded area, then starting a laser welding machine, and laser emitted by the laser welding machine irradiates the to-be-welded area of the current collecting disc and is used for welding the current collecting disc to the battery cell. According to the current collecting disc welding method, the protective gas is controlled to be blown to the to-be-welded area on the periphery side from the center of the current collecting disc, so that the to-be-welded area is uniformly covered by the protective gas, failure problems such as welding pinholes and explosion points can be avoided to a certain extent, potential safety hazards such as scalding and burning of the isolating membrane are avoided, and further welding quality and safety performance are improved. In addition, the protective gas is blown to the to-be-welded area on the periphery from the center of the collecting disc, so that dust or other sundries in the to-be-welded area can be removed, and generated welding slag and the like can be blown to the outer side of the collecting disc in the welding process, so that the welding quality is further improved.

Drawings

Fig. 1 is a schematic structural diagram of a current collecting disc and a battery cell according to an embodiment of the present application disposed in a welding fixture of the current collecting disc;

FIG. 2 is a schematic view of the structure of FIG. 1 with the base omitted;

FIG. 3 is a cross-sectional view of FIG. 1;

FIG. 4 is an enlarged view of FIG. 3 at A;

FIG. 5 is a schematic view of a base according to an embodiment of the present disclosure;

FIG. 6 is a schematic view of a first view of a compression member according to an embodiment of the present disclosure;

FIG. 7 is a schematic view of a second view of a compression member according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a current collecting tray according to an embodiment of the present disclosure;

fig. 9 is a flow chart of a method for welding a current collecting plate according to an embodiment of the present application.

Description of the reference numerals

1. A pressing member; 1a, a containing groove; 1b, a gas passing channel; 1c, avoiding grooves; 1d, via holes; 2. a base; 2a, an air inlet channel; 2b, a first sub-airway; 2c, a second sub-airway; 2d, a connecting part; 2e, grooves; 3. a battery cell; 3a, an air outlet channel; 4. a collecting tray; 4a, an air outlet hole.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and technical features in the embodiments may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the gist of the present application and should not be construed as undue limitation to the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof herein are intended to cover a non-exclusive inclusion.

In the description of the embodiments of the present application, the technical terms "first," "second," "third," etc. are used merely to distinguish between different objects and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, the character "/" generally indicates that the associated object is an "or" relationship.

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc. are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured, operated, or used in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the term "contact" is to be understood in a broad sense as either direct contact or contact across an intermediate layer, as either contact with substantially no interaction force between the two in contact or contact with interaction force between the two in contact.

With the development of clean energy, more and more devices use electric energy as driving energy, and further, as a power battery capable of storing more electric energy and being charged and discharged repeatedly, for example, a lithium ion battery is rapidly developed. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and various fields such as aerospace and the like.

With the great popularization of new energy automobiles by the country, the new energy automobiles come to develop at great opportunity. Safety and stability of automobiles have been of great concern. Therefore, improving the safety of the new energy automobile is one of the important factors for determining whether the new energy automobile can be popularized rapidly. The battery module is used as a main component of a battery pack of the new energy automobile, and improving the safety of the battery module is an important way for improving the safety of the new energy automobile.

In the related art, in the process of welding the current collecting disc onto the battery cell, the shielding gas adopts a paraxial blowing mode, so that partial welding areas are prone to uneven distribution of shielding gas flow, failure problems such as welding pinholes or explosion points occur, potential safety hazards such as isolating film scalding/burning exist, and poor welding quality can be caused.

In order to improve welding quality and security performance, embodiments of the present application provide a current collecting plate welding jig, which includes a pressing piece and an air inlet channel. The compressing member is provided with a receiving groove for receiving the collecting tray. The compressing piece is provided with an air passage and a plurality of avoiding grooves. The avoidance grooves are distributed on the peripheral side of the gas passing channel so as to expose the area to be welded on the collecting disc. Each avoidance groove is communicated with the overair channel. One end of the air inlet channel is communicated with the air source, and the other end of the air inlet channel is communicated with the air passing channel, so that the protective gas in the air inlet channel can flow to the avoidance groove through the air passing channel.

The current collecting disc welding jig provided by the embodiment of the application can be applied to welding the current collecting disc to a cylindrical battery cell, and can also be applied to welding the current collecting disc to battery cells of other shapes, such as cuboid shapes.

The current collecting disc welding device provided by the embodiment of the application can be applied to welding the current collecting disc to a cylindrical battery cell, and can also be applied to welding the current collecting disc to battery cells with other shapes, such as cuboid shapes.

The embodiment of the application provides a current collecting plate welding jig, referring to fig. 1 to 8, which comprises a pressing piece 1 and an air inlet channel 2a. The pressing member 1 is provided with a receiving groove 1a for receiving the collecting tray 4. The compressing element 1 is provided with an air passage 1b and a plurality of avoiding grooves 1c. The avoiding grooves 1c are distributed on the peripheral side of the gas passing channel 1b so as to expose the area to be welded on the collecting tray 4. Each avoidance groove 1c is communicated with the overair passage 1 b. One end of the air inlet channel 2a is communicated with an air source, and the other end of the air inlet channel 2a is communicated with the air passing channel 1b, so that the protective gas in the air inlet channel 2a can flow to the avoidance groove 1c through the air passing channel 1 b.

The current collecting plate 4 is a member for covering the case opening of the battery cell, connecting the tab of the cell 3 assembly in the case, and connecting the post of the cap assembly of the battery cell. The current collecting plate 4 needs to be made of a conductive metal material to ensure that it can serve as a good conductor between the tab and the electrode after being connected to the tab and the electrode.

The welding jig for the current collecting disc can be applied to welding between the current collecting disc 4 and a cylindrical battery cell, and can also be applied to welding between the current collecting disc 4 and battery cells in other shapes, such as cuboid shapes.

The current collecting plate 4 covers a portion of the case opening of the battery cell, so the current collecting plate 4 may be provided in a shape, for example, a circular shape, to be adapted to the shape of the case opening of the battery cell.

And meanwhile, the current collecting disc 4 is also used for welding with the lug of the cell 3 assembly. The to-be-welded area of the current collecting disc 4 can be set to be proper in area and position according to the requirements of the welding electrode lugs.

In addition, the shape of the area to be welded of the current collecting plate 4 is not limited. May be determined according to the specific circumstances.

Referring to fig. 4 and 6 to 7, the compressing member 1 is provided with a receiving groove 1a for receiving the current collecting plate 4, the current collecting plate 4 is disposed in the receiving groove 1a, and one end of the battery cell 3 may extend into the receiving groove 1a and abut against the current collecting plate 4. In this way, it is advantageous to weld the collector plate 4 to the cells 3.

The compressing element 1 is provided with an air passage 1b, and the shielding gas provided by the air source can flow into the air passage 1b.

Referring to fig. 2 and 6, the compression member 1 is provided with a plurality of avoidance grooves 1c, each avoidance groove 1c is distributed on the peripheral side of the gas passage 1b so as to expose the to-be-welded area on the collecting tray 4, and each avoidance groove 1c is communicated with the gas passage 1b.

It should be noted that, the plurality of the embodiments of the present application refers to two or more than two.

For example, referring to fig. 2 and 6, the number of the avoidance grooves 1c is 8, and the 8 avoidance grooves 1c are radially distributed on the circumferential side of the gas passing channel 1 b.

By arranging the avoidance groove 1c so as to expose the area to be welded on the current collecting disc 4, the laser welding device is used for avoiding laser emitted by the laser welding device, so that the laser can irradiate the area to be welded of the current collecting disc 4 through the avoidance groove 1c, and the current collecting disc 4 is used for being welded to the battery cell 3.

Each avoidance groove 1c is communicated with the gas passage 1b, and the protective gas provided by the gas source can be blown to each avoidance groove 1c through the gas passage 1b, so that the protective gas can be uniformly covered on the area to be welded. The whole welding environment can be covered with inert protective gas, and oxidation of the collecting disc 4 in the high-temperature welding process can be avoided to a certain extent, so that the welding quality and the welding stability are improved.

The avoidance grooves 1c are distributed on the peripheral side of the gas passing channel 1b so as to realize that the shielding gas is blown to the to-be-welded area on the peripheral side from the center of the collecting disc 4, and interference among the shielding gases in different to-be-welded areas can be avoided to a certain extent, so that the shielding gas uniformly covers the to-be-welded area.

The specific type of the shielding gas is not limited herein, and may be an inert gas, which can prevent oxidation of the collecting tray 4 during the high temperature welding process to some extent, thereby improving welding quality and welding stability. Illustratively, the shielding gas is nitrogen.

The specific type of the intake passage 2a is not limited herein.

The current collecting disc welding jig provided by the embodiment of the application comprises a pressing piece 1 and an air inlet channel 2a. Be provided with on the compression member 1 and dodge groove 1b and a plurality of groove 1c, through dodging each groove 1c and set up in the week side of crossing air channel 1b, the air supply passes through air inlet channel 2a intercommunication with crossing air channel 1b, so, the shielding gas that the air supply provided can get into through air inlet channel 2a and cross air channel 1b, dodge groove 1c of the week side of flowing to cover and wait to weld the region, that is to say, through the control shielding gas by the center blowing of collecting tray 4 to the waiting of week side to weld the region, can make the shielding gas evenly cover wait to weld the region, can avoid appearing the inefficacy problem such as welding pinhole, explosion point to a certain extent, and avoid potential safety hazards such as barrier film scald, burn, and then improved welding quality and security performance. In addition, the protective gas is blown from the center of the collecting tray 4 to the to-be-welded area on the periphery, so that dust or other sundries in the to-be-welded area can be removed, and generated welding slag and the like can be blown towards the outer side of the collecting tray 4 in the welding process, so that the welding quality is further improved.

The specific cross-sectional shape of the pressing member 1 is not limited herein, and the cross-sectional shape of the pressing member 1 is, for example, circular. I.e. the compression member 1 is in the shape of a ring.

The specific structure of the gas passage 1b and the escape groove 1c is not limited herein. In some embodiments, referring to fig. 3, 4 and 7, the overair passage 1b extends along the height direction of the compression member 1. The side wall of the gas passage 1b is provided with a through hole 1d communicating with each avoidance groove 1c.

The fact that the air passage 1b extends in the height direction of the pressing member 1 means that the air passage 1b may be parallel to the height direction of the pressing member 1, that is, may be parallel to the center line of the pressing member 1, or may be inclined with respect to the center line.

The side wall of the gas passage 1b is provided with a through hole 1d communicating with each avoidance groove 1c in a penetrating manner, so that the avoidance holes are not communicated with each other, and the shielding gas in the gas passage 1b can flow into each avoidance groove 1c through the through hole 1d.

By providing the gas passage 1b so as to extend in the height direction of the pressing member 1, inflow of the shielding gas is facilitated, and the shielding gas flowing into the gas passage 1b is blown uniformly toward the respective escape grooves 1c.

In some embodiments, referring to fig. 3 and 4, the center line of the overair passage 1b coincides with the center line of the compression member 1. I.e. the centre line of the overair channel 1b falls on the centre line of the compression member 1.

The fact that the center line of the air passage 1b coincides with the center line of the pressing member 1 means that the center line of the air passage 1b coincides substantially or completely with the center line of the pressing member 1.

By arranging the gas passage 1b at the center of the pressing member 1, the arrangement of the region to be welded on the collecting tray 4 is facilitated, and the shielding gas flowing into the gas passage 1b is uniformly blown toward the respective avoiding grooves 1c.

In some embodiments, referring to fig. 3, 4 and 7, the receiving groove 1a is opened toward the bottom of the pressing member 1, and each escape groove 1c penetrates the top wall of the receiving groove 1a.

The receiving groove 1a is open toward the bottom of the pressing member 1, and the collecting tray 4 can be inserted into the receiving groove 1a from the open position of the bottom of the pressing member 1. One end of the battery cell 3 may also extend into the receiving groove 1a through the opening of the bottom of the pressing member 1 so that one end of the battery cell 3 abuts against the current collecting plate 4, thereby causing the current collecting plate 4 to abut against the top wall of the receiving groove 1a.

Each avoiding groove 1c penetrates through the top wall of the accommodating groove 1a, so that the laser welding machine can be arranged above the current collecting disc welding jig, so that laser can irradiate the region to be welded of the current collecting disc 4 through the avoiding groove 1c penetrating through the top wall of the pressing piece 1, and the current collecting disc 4 is used for being welded to the battery cell 3.

The specific cross-sectional shape of the escape groove 1c is not limited herein, and may be, for example, square, oval, circular, or rectangular. In the embodiment of the application, the cross section of the avoidance groove 1c is taken as a rectangle as an example for description, and the vertex angle of the rectangle is smoothly transited through an arc.

In some embodiments, referring to fig. 2, 6 and 7, the size of the escape groove 1c in the radial direction of the compression member 1 is larger than the size of the escape groove 1c in the circumferential direction of the compression member 1.

The dimension of the escape groove 1c along the circumferential direction of the compression member 1 is the dimension of the escape groove 1c along the circumferential direction of the compression member 1.

With dodging the groove 1c as the rectangle example, dodging the radial size of groove 1c along compressing tightly piece 1 and being greater than dodging the radial size of groove 1c along compressing tightly piece 1, dodging the long border radial setting of groove 1c promptly, dodging the minor face of groove 1c and setting along circumference. The escape grooves 1c are radially provided on the peripheral side of the gas passage 1 b.

It can be appreciated that the long edge of the avoidance groove 1c is radially arranged, and the short edge of the avoidance groove 1c is circumferentially arranged, so that the protection gas is more beneficial to blowing to the avoidance groove 1c and flows along the avoidance groove 1 c. In addition, the long edge of the avoidance groove 1c is arranged radially, so that the condition of the backflow of the protective gas can be improved to a certain extent.

In the related art, an independent vent pipe is generally adopted to blow out protective gas towards a to-be-welded area, but because of the blocking of a welding jig and a laser head, the interval between the air outlet end of the vent pipe and a current collecting disc is larger, the protective gas continuously diffuses and escapes in the moving process from the air outlet end to the current collecting disc, and less protective gas can reach the appointed to-be-welded area, so that poor welding quality is caused.

In the current collecting plate welding jig of the embodiment of the application, the top end of the air passage 1b is a closed end, and the bottom end of the air passage 1b is an open end.

By setting the top end of the gas passage 1b as a closed end, the bottom end of the gas passage 1b is set as an open end. So, shielding gas can flow in through the bottom, and can directly blow to the district of waiting to weld through the air passage 1b that current collecting tray 4 formed and dodge groove 1c, has improved shielding gas's utilization ratio, and can reduce the blocking to current collecting tray welding jig and laser head as far as possible, has improved welded convenience. Secondly, through setting the top of passing through gas channel 1b to the blind end, the blind end can block by the shielding gas of bottom entering, more is favorable to the shielding gas flow to dodge groove 1c.

Of course, in other embodiments, the top end of the air passage 1b may be set as an open end, and the bottom end of the air passage 1b may be set as a closed end. I.e. the shielding gas can flow in through the top of the compression member 1.

In some embodiments, referring to fig. 1, 3 and 5, the current collecting plate welding jig further includes a base 2 located below the pressing member 1. The base 2 is disposed opposite to the pressing member 1 with the current collecting plate 4 and the battery cell 3 sandwiched therebetween such that one end of the battery cell 3 abuts against the current collecting plate 4, and the base 2 is formed with an air intake passage 2a.

The current collecting disc 4 and the battery cell 3 are clamped between the two, namely, the current collecting disc 4 is pressed between the pressing piece 1 and the base 2, so that the current collecting disc 4 and the battery cell 3 are fixed.

One end of the battery cell 3 is abutted against the current collecting disc 4, namely, one end of the battery cell 3 is pressed on the current collecting disc 4, so that displacement in the welding process is avoided, and the current collecting disc 4 can be welded to the battery cell 3.

The base 2 is formed with the air inlet channel 2a, that is, the shielding gas can enter the air passing channel 1b through the air inlet channel 2a formed on the base 2, so that the blocking to the welding jig of the collecting tray and the laser head is reduced as much as possible, and parts such as an air inlet pipe and the like are not required to be additionally arranged, so that the assembly efficiency is improved and the cost is reduced.

The specific cross-sectional shape of the base 2 is not limited herein. Illustratively, the cross-sectional shape of the base 2 is circular. I.e. the base 2 is ring-shaped.

As an example, with continued reference to fig. 1, 3 and 5, the side of the base 2 facing the pressing member 1 is provided with a groove 2e so that both ends of the battery cell 3 are clamped between the bottom surface of the groove 2e and the top surface of the receiving groove 1 a.

So, through setting up base 2, with current collecting tray 4 and electric core 3 centre gripping between compressing tightly piece 1 and base 2 to compress tightly the one end of electric core 3 on current collecting tray 4, avoid taking place the displacement at welded in-process, so, can make current collecting tray 4 welded to electric core 3. In addition, through being formed with air inlet channel 2a on base 2, shielding gas can get into through air channel 1b through air inlet channel 2a that forms on base 2, reduces as far as possible and blocks current collecting plate welding jig and laser head, and does not need parts such as extra setting up intake pipe, improves assembly efficiency and reduce cost.

In some embodiments, referring to fig. 3 and 5, the intake passage 2a includes a first sub-air passage 2b extending in a radial direction of the base 2 and a second sub-air passage 2c extending in a height direction of the base 2. One end of the first sub-air passage 2b is communicated with an air source, and the other end is communicated with the second sub-air passage 2c.

In this way, the shielding gas of the gas source can be communicated with the first sub-gas passage 2b from one radial side, which is beneficial to the communication between the gas inlet passage 2a and the gas source. The shielding gas flows along the radial direction of the base 2 and then flows along the height direction of the base 2.

In other embodiments, the first sub-air passage 2b extending in the radial direction of the base 2 may not be provided, and the air source is directly connected to the second sub-air passage 2c from the bottom of the base 2.

In some embodiments, referring to fig. 3, the flow cross-sectional area of the second sub-air passage 2c is larger than the flow cross-sectional area of the first sub-air passage 2 b.

The flow cross section refers to a cross section orthogonal to all flow lines of the elementary stream or the total stream, that is, a plane perpendicular to a flow velocity cluster such as a gas stream or a liquid stream. When the streamline clusters are not parallel to each other, the flow section is a curved surface; when the flow clusters are straight lines parallel to each other, the flow cross section is a plane.

It will be appreciated that the flow cross-sectional area of the second sub-air passage 2c is greater than the flow cross-sectional area of the first sub-air passage 2 b. Since the extending directions of the first sub-air passage 2b and the second sub-air passage 2c are different, the air flow flows from the first sub-air passage 2b to the second sub-air passage 2c, which is advantageous in reducing the flow resistance of the shielding gas.

In some embodiments, referring to fig. 3, the center line of the second sub-air passage 2c coincides with the center line of the base 2. I.e. the centre line of the second sub-air duct 2c substantially coincides with or completely coincides with the centre line of the base 2.

By disposing the second sub-air passage 2c at the center of the base 2, the arrangement of the air intake passage 2a and the communication between the air intake passage 2a and the overair passage 1b are facilitated.

In some embodiments, referring to fig. 1, 3 and 5, the outer side wall of the base 2 is provided with a connecting portion 2d. The connection 2d is adapted to communicate with a gas source. The space in the connecting portion 2d constitutes part of the intake passage 2a.

Through being provided with connecting portion 2d at the lateral wall protrusion of base 2, be favorable to with the air supply intercommunication, do not need parts such as extra setting up intake pipe, improve assembly efficiency and reduce cost.

The intake passage 2a and the excess air passage 1b may communicate in various ways.

In some embodiments, referring to fig. 3, 4 and 8, the cell 3 is provided with an air outlet channel 3a. The collecting tray 4 is provided with air outlet holes 4a. The shielding gas in the air inlet channel 2a flows through the air outlet channel 3a, the air outlet hole 4a and the air passing channel 1b in sequence and then flows to the avoiding groove 1c.

The cell 3 is provided with an air outlet channel 3a, which is beneficial for the shielding gas to flow to the air passing channel 1b through the air outlet channel 3a.

For example, referring to fig. 3, the flow cross-sectional area of the outlet channel 3a is smaller than the flow cross-sectional area of the second sub-air channel 2 c. The shielding gas in the second sub-gas passage 2c is facilitated to enter the gas outlet passage 3a.

The collecting tray 4 is provided with an air outlet 4a, which is beneficial for the shielding gas to flow to the gas passing channel 1b through the air outlet 4 a.

For example, referring to fig. 3 and 4, the flow cross-sectional area of the gas outlet hole 4a is smaller than the flow cross-sectional area of the gas passage 1b. The shielding gas in the gas outlet hole 4a is beneficial to enter the gas passing channel 1b.

So, be favorable to flowing through in proper order after air outlet channel 3a, venthole 4a and the air passage 1b in the air inlet channel 2a to dodge the groove 1c to realize that the shielding gas blows to the district of waiting of week side by the center of mass flow disk 4, need not additionally set up the intake pipe, improved assembly efficiency and reduced the cost.

The second aspect of the embodiments of the present application provides a current collecting plate welding device, including mount pad, laser welding machine, air supply and current collecting plate welding jig of any embodiment of the present application. The current collecting disc welding jig is arranged on the mounting seat. The laser welding machine is movably arranged at one side of the current collecting disc welding jig. The laser emitted from the laser welder can illuminate the area to be welded of the current collecting plate 4 through the avoiding groove 1c for welding the current collecting plate 4 to the battery cell 3. The air source is communicated with an air inlet channel 2a of the collecting disc welding jig.

The specific type of laser welder is not limited herein, and the laser welder is exemplified by a galvanometer welder.

The laser welding machine is movably arranged on one side of the current collecting disc welding jig, and can move to a welding position to weld according to requirements, so that the current collecting disc 4 is welded to the battery cell 3.

The current collecting plate welding device provided by the embodiment of the application, the current collecting plate welding jig comprises a pressing piece 1 and an air inlet channel 2a. Be provided with on the compression member 1 and dodge groove 1b and a plurality of groove 1c, through dodging each groove 1c and set up in the week side of crossing air channel 1b, the air supply passes through air inlet channel 2a intercommunication with crossing air channel 1b, so, the shielding gas that the air supply provided can get into through air inlet channel 2a and cross air channel 1b, dodge groove 1c of the week side of flowing to cover and wait to weld the region, that is to say, through the control shielding gas by the center blowing of collecting tray 4 to the waiting of week side to weld the region, can make the shielding gas evenly cover wait to weld the region, can avoid appearing the inefficacy problem such as welding pinhole, explosion point to a certain extent, and avoid potential safety hazards such as barrier film scald, burn, and then improved welding quality and security performance. In addition, the protective gas is blown from the center of the collecting tray 4 to the to-be-welded area on the periphery, so that dust or other sundries in the to-be-welded area can be removed, and generated welding slag and the like can be blown towards the outer side of the collecting tray 4 in the welding process, so that the welding quality is further improved.

A third aspect of the embodiment of the present application provides a current collecting disc welding method, which is applied to a current collecting disc welding device for welding a current collecting disc 4 to an electric core 3, referring to fig. 1 to 8, where the current collecting disc welding device includes a current collecting disc welding jig, a laser welding machine, and a gas source for providing a shielding gas, the current collecting disc welding jig includes an air inlet channel 2a and a compressing member 1 provided with a receiving slot 1a for receiving the current collecting disc 4, the compressing member 1 is provided with an air passing channel 1b and a plurality of avoidance slots 1c, each avoidance slot 1c is distributed on a peripheral side of the air passing channel 1b to expose a region to be welded on the current collecting disc 4, each avoidance slot 1c is communicated with the air passing channel 1b, one end of the air inlet channel 2a is communicated with the gas source, and the other end is communicated with the air passing channel 1b, so that the shielding gas in the air inlet channel 2a can flow to the avoidance slots 1c through the air passing channel 1 b.

Referring to fig. 9, the current collecting plate welding method includes:

step S100: determining a welding position of the battery cell and the current collecting disc in a current collecting disc welding jig;

step S200: starting an air source, wherein shielding gas flows into an air passage from an air inlet passage, and is blown to a to-be-welded area on the periphery side from the air passage;

step S300: and starting the laser welding machine, and irradiating the region to be welded of the current collecting disc by laser emitted by the laser welding machine for welding the current collecting disc to the battery core.

In the welding process, after the welding positions of the battery cell 3 and the current collecting disc 4 in the current collecting disc welding jig are determined, starting an air source, wherein the air source is used for providing protective air, the protective air is blown from the center of the current collecting disc 4 to a to-be-welded area on the periphery side, so that the protective air covers the to-be-welded area, then starting a laser welding machine, and irradiating the to-be-welded area of the current collecting disc 4 by laser emitted by the laser welding machine for welding the current collecting disc 4 to the battery cell 3. According to the current collecting disc welding method, the protective gas is controlled to be blown to the to-be-welded area on the periphery side from the center of the current collecting disc 4, so that the to-be-welded area is uniformly covered by the protective gas, failure problems such as welding pinholes and explosion points can be avoided to a certain extent, potential safety hazards such as scalding and burning of the isolating membrane are avoided, and welding quality and safety performance are improved. In addition, the protective gas is blown from the center of the collecting tray 4 to the to-be-welded area on the periphery, so that dust or other sundries in the to-be-welded area can be removed, and generated welding slag and the like can be blown towards the outer side of the collecting tray 4 in the welding process, so that the welding quality is further improved.

For example, referring to fig. 1 to 7, the collecting tray welding jig includes a pressing member 1 and an air inlet passage 2a. The pressing member 1 is provided with a receiving groove 1a for receiving the collecting tray 4. The compressing element 1 is provided with an air passage 1b and a plurality of avoiding grooves 1c. The avoiding grooves 1c are distributed on the peripheral side of the gas passing channel 1b so as to expose the area to be welded on the collecting tray 4. Each avoidance groove 1c is communicated with the overair passage 1 b. One end of the air inlet channel 2a is communicated with an air source, and the other end of the air inlet channel 2a is communicated with the air passing channel 1b, so that the protective gas in the air inlet channel 2a can flow to the avoidance groove 1c through the air passing channel 1 b.

So, through being provided with the air passage 1b and dodging groove 1c on compressing tightly piece 1, through dodging groove 1c setting up in air passage 1 b's week side, the air supply passes through air inlet channel 2a with air passage 1b and communicates, so, the shielding gas that the air supply provided can get into air passage 1b through air inlet channel 2a, dodge groove 1c of the week side of flowing from air passage 1b again, and cover and wait the welded area, that is, blow to the area of waiting of week side through the center of control shielding gas by collecting tray 4, can make the shielding gas evenly cover wait the welded area, can avoid appearing the welding pinhole to a certain extent, explode failure problem such as some, and avoid potential safety hazards such as barrier film scald, burn, and then improve welding quality and security performance. In addition, the protective gas is blown from the center of the collecting tray 4 to the to-be-welded area on the periphery, so that dust or other sundries in the to-be-welded area can be removed, and generated welding slag and the like can be blown towards the outer side of the collecting tray 4 in the welding process, so that the welding quality is further improved.

In some embodiments, referring to fig. 2 to 4, the receiving grooves 1a are opened toward the bottom of the pressing member 1, and each escape groove 1c penetrates the top wall of the receiving groove 1 a.

According to the current collecting disc welding jig, the top end of the air passage 1b is the closed end, and the bottom end of the air passage 1b is the open end.

In some embodiments, referring to fig. 3 and 4, the cell 3 is provided with an air outlet channel 3a. The collecting tray 4 is provided with air outlet holes 4a. The shielding gas in the air inlet channel 2a flows through the air outlet channel 3a, the air outlet hole 4a and the air passing channel 1b in sequence and then flows to the avoiding groove 1c.

Illustratively, the flow cross-sectional area of outlet channel 3a is smaller than the flow cross-sectional area of second sub-airway 2 c. The shielding gas in the second sub-gas passage 2c is facilitated to enter the gas outlet passage 3a.

The collecting tray 4 is provided with an air outlet 4a, which is beneficial for the shielding gas to flow to the gas passing channel 1b through the air outlet 4a.

Illustratively, the flow cross-sectional area of the outlet aperture 4a is smaller than the flow cross-sectional area of the gas passage 1b. The shielding gas in the gas outlet hole 4a is beneficial to enter the gas passing channel 1b.

The current collecting disc welding method further comprises feeding the battery cells 3 and the current collecting disc 4, placing the battery cells 3 and the current collecting disc 4 on the base 2, pressing down the pressing piece 1 for clamping the battery cells 3 and the current collecting disc 4 between the pressing piece 1 and the base 2 so as to press one end of the battery cells 3 on the current collecting disc 4, and avoiding displacement in the welding process, so that the current collecting disc 4 can be welded to the battery cells 3.

Illustratively, after the welding is completed, the current collecting disc welding method further comprises blanking the battery cells 3 and the current collecting disc 4, firstly lifting the pressing piece 1, and then taking out the welded battery cells 3 and the welded current collecting disc 4 from the welding position in the current collecting disc welding jig.

The current collecting disc welding device further comprises a detection unit and a control device, wherein the detection unit is used for detecting whether the battery core 3 and the current collecting disc 4 are positioned at the welding position in the current collecting disc welding jig, if the detection unit detects whether the battery core 3 and the current collecting disc 4 are positioned at the welding position in the current collecting disc welding jig, a signal is transmitted to the control device, the control device controls a starting air source, gas to be protected is blown to a to-be-welded area on the periphery side from the center of the current collecting disc 4, after the to-be-welded area is uniformly covered by the protective gas, the control device controls a starting laser welding machine, and laser emitted by the laser welding machine irradiates the to-be-welded area of the current collecting disc 4 and is used for welding the current collecting disc 4 to the battery core 3.

In the description of the present application, reference to the terms "one embodiment," "in some embodiments," "in other embodiments," "in yet other embodiments," or "exemplary" etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples described herein, as well as the features of the various embodiments or examples, may be combined by those skilled in the art without contradiction.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application are included in the protection scope of the present application.

Claims

1. The utility model provides a mass flow dish welding jig which characterized in that includes:

2. The current collecting tray welding jig according to claim 1, wherein the gas passing passage extends in a height direction of the pressing member, and a side wall of the gas passing passage is provided with a through hole penetrating through the side wall and communicating with each of the avoiding grooves.

3. The current collecting tray welding jig according to claim 1, wherein a center line of the gas passage coincides with a center line of the pressing member.

4. The current collecting tray welding jig according to claim 1, wherein the receiving grooves are opened toward the bottom of the pressing member, and each of the escape grooves penetrates through the top wall of the receiving groove.

5. The current collecting tray welding jig according to claim 1, wherein the dimension of the escape groove in the radial direction of the pressing member is larger than the dimension of the escape groove in the circumferential direction of the pressing member.

6. The manifold hub welding jig of claim 5, wherein a top end of said gas passage is a closed end and a bottom end of said gas passage is an open end.

7. The current collecting tray welding jig according to any one of claims 1 to 6, further comprising a base located below the pressing member, the base being disposed opposite to the pressing member with the current collecting tray and the battery cell sandwiched therebetween so that one end of the battery cell abuts against the current collecting tray, the base being formed with the air intake passage.

8. The manifold hub welding jig of claim 7, wherein said air inlet channel comprises a first sub-air channel extending in a radial direction of said base and a second sub-air channel extending in a height direction of said base, one end of said first sub-air channel being in communication with an air source and the other end being in communication with said second sub-air channel.

9. The current collecting tray welding jig according to claim 8, wherein a flow cross-sectional area of the second sub-air passage is larger than a flow cross-sectional area of the first sub-air passage; and/or, the center line of the second sub-air passage coincides with the center line of the base.

10. The welding jig for a collecting tray according to claim 7, wherein a connecting portion is provided on an outer side wall of the base in a protruding manner, the connecting portion is used for communicating with an air source, and a space in the connecting portion constitutes part of the air inlet passage.

11. The current collecting disc welding jig according to claim 7, wherein the electric core is provided with an air outlet channel, the current collecting disc is provided with an air outlet hole, and the protective gas in the air inlet channel flows through the air outlet channel, the air outlet hole and the air passing channel in sequence and then flows to the avoidance groove.

12. A current collecting tray welding apparatus, comprising:

a mounting base;

the current collecting tray welding jig of any one of claims 1 to 11, which is mounted on the mount;

13. The current collecting plate welding method is characterized by being applied to a current collecting plate welding device for welding the current collecting plate to an electric core, wherein the current collecting plate welding device comprises a current collecting plate welding jig, a laser welding machine and a gas source for providing protective gas, the current collecting plate welding jig comprises an air inlet channel and a pressing piece provided with a containing groove for containing the current collecting plate, the pressing piece is provided with an air passing channel and a plurality of avoidance grooves, the avoidance grooves are distributed on the periphery of the air passing channel so as to expose a to-be-welded area on the current collecting plate, the avoidance grooves are communicated with the air passing channel, one end of the air inlet channel is communicated with the gas source, and the other end of the air inlet channel is communicated with the air passing channel, so that the protective gas in the air inlet channel can flow to the avoidance grooves through the air passing channel;

the current collecting disc welding method comprises the following steps: