CN217571202U - Welding equipment - Google Patents

Abstract

The application provides a welding equipment for welding free electrode terminal of battery and piece that converges, welding equipment includes: a welding device; a pressing device for pressing the bus bar on the electrode terminals in a first direction, the pressing device having a through hole through which the welding device welds the bus bar and the electrode terminals; and the displacement compensation device is connected with the pressing device and used for adjusting the displacement of the pressing device along a second direction so that the through hole is opposite to the welding position of the bus piece and the electrode terminal, wherein the second direction is vertical to the first direction. The application provides a welding equipment adjusts closing device through the displacement of displacement compensation arrangement along the second direction for closing device's via hole is just to the welded position of converging piece and electrode terminal. Therefore, the risk of welding failure of the welding device to the electrode terminal and the bus piece can be reduced, the single battery forms a reliable series or parallel loop, and the product quality of the battery is improved.

Description

Welding equipment

Technical Field

The application relates to the technical field of batteries, in particular to welding equipment.

Background

Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and the like.

In addition to improving the performance of batteries, the quality of products in the production of batteries is also a concern in the development of battery technology. Therefore, how to improve the product quality in the production process of the battery is an urgent problem to be solved in the battery technology.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a welding equipment, can improve the connection reliability of battery monomer and piece that converges in the battery, and then improves the product quality of battery.

The embodiment of the application provides a welding device for welding electrode terminals and a bus bar of a battery cell. The welding equipment comprises a welding device, a pressing device and a displacement compensation device. The pressing device is used for pressing the bus bar piece on the electrode terminal along a first direction, the pressing device is provided with a through hole, and the welding device is used for welding the bus bar piece and the electrode terminal through the through hole. The displacement compensation device is connected with the pressing device and used for adjusting the displacement of the pressing device along a second direction so that the through hole is opposite to the welding position of the bus piece and the electrode terminal, wherein the second direction is perpendicular to the first direction.

The welding equipment that this application embodiment provided is through setting up displacement compensation arrangement to set up displacement compensation arrangement and be connected with closing device, with the displacement of adjustment closing device along the second direction, make closing device's via hole just to the welded position of converging piece and electrode terminal. Therefore, the risk of welding failure of the welding device to the electrode terminal and the bus piece can be reduced, the single battery forms a reliable series or parallel loop, and the product quality of the battery is improved.

In some embodiments, the welding apparatus includes a plurality of hold-down devices spaced apart along the second direction.

The plurality of pressing devices are arranged, so that the pressing devices can work alternately, the time for the welding device to wait for the pressing devices to adjust the position and compress is reduced, the utilization rate of the welding device is improved, and the production efficiency of the battery is improved.

In some embodiments, a displacement compensation device is correspondingly arranged on each pressing device. So set up for each closing device is compressing tightly electrode terminal and the in-process that converges the piece, and its via hole can both just to electrode terminal and converge the welding position of piece, so set up, can further improve welding set welding position's accuracy, and then improve the reliability that converges piece and electrode terminal and be connected and the product quality of battery.

In some embodiments, the displacement compensation device comprises a drive member connected to the hold-down device for driving movement of the hold-down device in the second direction. The driving component drives the pressing device to move along the second direction, so that the pressing device can move more accurately along the second direction, and the accuracy of the displacement compensation device for the pressing device in displacement compensation is improved.

In some embodiments, the compression device comprises: a connecting plate; a pressure head movably penetrating the connection plate in a first direction and pressing the bus bar against the electrode terminal, the via hole penetrating the pressure head in the first direction; the elastic piece is arranged between the pressure head and the connecting plate.

Set up the deformation link pressure head that the elastic component can pass through the elastic component and converge the pressure between the piece, so, can reduce the pressure head and lead to the fact the risk of damaging to converging piece and electrode terminal.

In some embodiments, the connecting plate is provided with a plurality of pressing heads, and the plurality of pressing heads are arranged at intervals; and/or one pressure head is provided with a plurality of through holes which are arranged at intervals.

Above-mentioned two kinds of setting modes, all can improve welding equipment's work efficiency.

In some embodiments, the ram comprises: an outer sleeve including an outer cylinder and a mounting part protruding from an outer circumferential surface of the outer cylinder, the mounting part being used to mount an elastic member, the outer cylinder being used to press the bus bar against the electrode terminal; the inner sleeve at least partially extends into the outer cylinder and is connected with the outer cylinder, and a through hole is formed in the inner sleeve; the installation part is provided with a gas inlet and a gas outlet, the gas inlet is used for inputting inert gas, and an overflowing channel used for communicating the gas inlet and the gas outlet is formed between the outer barrel and the inner sleeve.

Through setting up the passageway that overflows to input inert gas to the welding position of converging piece and electrode terminal, reduced and converged piece and electrode terminal and taken place the risk of oxidation at the welded in-process, be favorable to improving welding quality.

In some embodiments, the pressure head further comprises a guide post, the guide post is arranged on the mounting portion, and the elastic element is sleeved on the guide post. The guide post can guide the direction that the elastic component takes place deformation or the direction that resumes deformation, is favorable to guaranteeing welding set to converging the accuracy of piece and electrode terminal welding position.

In some embodiments, the welding equipment further comprises a dust removal device, the dust removal device comprises a negative pressure mechanism and a dust removal pipeline, and the dust removal pipeline penetrates through the outer cylinder and the inner sleeve to communicate the negative pressure mechanism with the via hole.

Set up dust collector, can clear away the granule or the dust that produce among the welding process, effectively reduce the contaminated risk of the welding position of piece and the electrode terminal that converges.

In some embodiments, the welding apparatus further comprises an anemometer for measuring the wind speed of the dust removal pipe. The anemoscope is arranged to monitor the wind speed passing through the through hole, so that the stability of welding quality is guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery manufactured by using a welding apparatus according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of a battery module in a battery manufactured by the welding apparatus according to the embodiment of the present disclosure;

fig. 3 is an exploded view of a battery cell in a battery manufactured by a welding apparatus according to an embodiment of the present disclosure;

FIG. 4 is a front view of a welding apparatus provided in an embodiment of the present application, with a welding device omitted;

FIG. 5 is a schematic structural diagram of a welding apparatus provided in an embodiment of the present application, with a welding device omitted;

FIG. 6 is a schematic partial structural diagram of a pressing device in a welding apparatus according to an embodiment of the present disclosure;

FIG. 7 is a front view of a partial structure of a pressing device in the welding apparatus according to the embodiment of the present disclosure;

FIG. 8 isbase:Sub>A cross-sectional structural view taken along A-A of FIG. 7;

FIG. 9 is a schematic cross-sectional view taken along B-B of FIG. 8;

fig. 10 is a schematic structural diagram of a welding apparatus provided in another embodiment of the present application, with a welding device omitted.

In the drawings, the drawings are not necessarily drawn to scale.

Description of the labeling:

10. a battery; 11. a bottom case; 12. a top shell; 13. a battery module;

20. a bus bar;

30. a battery cell; 31. a housing; 31a, an opening; 32. an electrode assembly; 33. an end cap assembly; 331. a cover body; 332. an electrode terminal;

41. a pressing device; 41a, a via hole; 411. a connecting plate; 412. a pressure head; 4121. an outer sleeve; 41211. an outer cylinder; 41212. an installation part; 4121a, an intake port; 4121b, an air outlet; 4121c, an overflow channel; 4122. an inner sleeve; 4123. a guide post; 413. an elastic member; 42. a displacement compensation device; 421. a drive member; 43. a dust removal device; 431. a dust removal pipeline; 44. an anemometer;

x, a first direction; y, a second direction.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application, but are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

In this application, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the embodiment of the present application is not limited thereto. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in a packaging manner: the single battery of cylindricality battery, square battery monomer and laminate polymer battery monomer, this application embodiment is also not limited to this.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separator. The single battery mainly depends on metal ions to move between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is laminated to be used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the mass flow body protrusion in the mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer is as negative pole utmost point ear after the mass flow body of not scribbling the negative pole active substance layer is range upon range of. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The material of the separator may be PP, PE, or the like. In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The inventor finds that after the problem that the yield of qualified products is not high in the production process of the battery, systematic analysis and research are carried out on the production process of the battery and the internal structure of the reported waste products, and as a result, the inventor finds that in the production process of the battery, a bus piece needs to be welded and connected with the electrode terminal of a battery monomer to realize series connection or parallel connection of the battery monomers. In the process of welding the electrode terminal and the bus-bar piece by using the welding device of the welding equipment, after the welding of one station is completed, the pressing device can move a preset distance to press the next electrode terminal and the bus-bar piece, and because errors exist in the arrangement process of the battery monomers, the actual intervals among the battery monomers are not necessarily arranged according to the preset distance, because the through holes of the pressing device are not over against the positions of the electrode terminal and the bus-bar piece to be welded, the deviation exists between the actual welding positions of the electrode terminal and the bus-bar piece and the positions of the electrode terminal and the bus-bar piece to be welded, the welding failure of the electrode terminal and the bus-bar piece is caused, and an effective parallel or series loop cannot be formed among the battery monomers, so that the quality of the produced battery is unqualified, and the product quality of the battery is seriously influenced.

Based on the above problems discovered by the inventor, the inventor improves the structure of the welding equipment, and the technical scheme described in the embodiment of the application is suitable for the welding equipment.

The welding apparatus provided according to the present application is used to weld electrode terminals and bus bars of battery cells. The welding equipment comprises a welding device, a pressing device and a displacement compensation device. The pressing device is used for pressing the bus piece on the electrode terminal along the first direction, the pressing device is provided with a through hole, and the welding device is used for welding the bus piece and the electrode terminal through the through hole. The displacement compensation device is connected with the pressing device and used for adjusting the displacement of the pressing device along a second direction so that the via hole is over against the welding position of the bus piece and the electrode terminal, wherein the second direction is perpendicular to the first direction.

The application provides a welding equipment can adjust closing device's displacement through setting up displacement compensation arrangement to make its via hole just to the welded position of piece and electrode terminal that converges, improve the welding accuracy nature, and then improve product quality.

Referring to fig. 1, a battery 10 includes battery cells (not shown in fig. 1). The battery 10 may also include a case for housing the battery cells.

The box is used for holding battery cell, and the box can be various structural style.

In some embodiments, the case may include a bottom shell 11 and a top shell 12. The bottom shell 11 and the top shell 12 are mutually covered. The bottom case 11 and the top case 12 together define a receiving space for receiving the battery cells. The bottom case 11 and the top case 12 may be both hollow structures having one side opened. The open side of the bottom case 11 is covered with the open side of the top case 12, thereby forming a box body having an accommodating space. A sealing member may be disposed between bottom case 11 and top case 12 to seal bottom case 11 and top case 12.

In practical applications, the bottom shell 11 can be covered on the top of the top shell 12. The bottom case 11 may also be referred to as an upper case, and the top case 12 may also be referred to as a lower case.

The bottom case 11 and the top case 12 may be various shapes, for example, a cylinder, a rectangular parallelepiped, etc. In fig. 2, the bottom case 11 and the top case 12 are each exemplarily a rectangular parallelepiped structure.

In the battery 10, one or more battery cells may be provided. If there are a plurality of battery cells, the plurality of battery cells may be connected in series, in parallel, or in series-parallel. The series-parallel connection means that a plurality of battery monomers are connected in series and in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery monomers is accommodated in the box body, or the plurality of battery monomers can be connected in series or in parallel or in series-parallel to form the battery module. The plurality of battery modules are connected in series or in parallel or in series-parallel to form a whole and are accommodated in the box body.

As shown in fig. 2, in some embodiments, there are a plurality of battery cells 30 in the battery. The plurality of battery cells 30 are first assembled into the battery module 13 through the bus bar 20 in series or in parallel or in series-parallel. The plurality of battery modules 13 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case.

In some embodiments, the plurality of battery cells 30 in the battery module 13 may be electrically connected by the bus bar 20 to realize parallel connection or series-parallel connection of the plurality of battery cells 30 in the battery module 13.

As shown in fig. 3, the battery cell 30 includes a case 31, an electrode assembly 32, an end cap assembly 33, and an adaptor member. The housing 31 has an opening 31a. The electrode assembly 32 is accommodated in the case 31. The electrode assembly 32 includes tabs. The cap assembly 33 includes a cap body 331, an electrode terminal 332, and an insulating member. The end cap is used to cover the opening 31a. The electrode terminal 332 is attached to the lid 331. The insulating member is located on the side of the cap 331 facing the electrode assembly 32. The adapter member is used to connect the electrode terminal 332 and the tab such that the tab is electrically connected to the electrode terminal 332. Wherein the housing includes a cover 331 and a case 31.

The housing 31 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like. The shape of the case 31 may be determined according to the specific shape of the electrode assembly 32. For example, if the electrode assembly 32 has a cylindrical structure, the case 31 may be selected to have a cylindrical structure. If the electrode assembly 32 has a rectangular parallelepiped structure, the case 31 may have a rectangular parallelepiped structure. In fig. 3, the case 31 and the electrode assembly 32 are each exemplarily of a rectangular parallelepiped structure.

The material of the housing 31 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present invention is not limited thereto.

The electrode assembly 32 accommodated in the case 31 may be one or more. In fig. 3, the number of electrode assemblies 32 accommodated in the case 31 is two.

In some embodiments, the electrode assembly 32 further includes a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 32 may be a wound structure formed of a positive electrode sheet, a separator, and a negative electrode sheet by winding. The electrode assembly 32 may also be a stacked structure formed by a positive electrode sheet, a separator, and a negative electrode sheet through a stacked arrangement.

The positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer. The positive active material layer is coated on the surface of the positive current collector. The negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The barrier film is arranged between the positive plate and the negative plate and used for isolating the positive plate from the negative plate so as to reduce the risk of short circuit between the positive plate and the negative plate.

The material of the isolation film may be PP (polypropylene) or PE (polyethylene).

The tabs in the electrode assembly 32 are divided into positive and negative tabs. The positive electrode tab may be a portion of the positive electrode current collector that is not coated with the positive electrode active material layer. The negative electrode tab may be a portion of the negative electrode current collector that is not coated with the negative electrode active material layer.

As shown in fig. 4 and 5, a welding apparatus is provided for welding the electrode terminals 332 of the battery cells 30 and the bus bar 20 according to an embodiment of the present application. The welding apparatus comprises a welding device (not shown), a pressing device 41 and a displacement compensation device 42. The pressing device 41 is used to press the bus bar 20 against the electrode terminals 332 in the first direction X, and the pressing device 41 has a through hole 41a through which the welding device welds the bus bar 20 and the electrode terminals 332. The displacement compensating means 42 is connected to the pressing means 41 for adjusting the displacement of the pressing means 41 in a second direction Y perpendicular to the first direction X so that the via hole 41a faces the welding position of the bus bar 20 and the electrode terminal 332.

Specifically, the welding device may be laser welding, or may be other welding methods, and it is understood that the laser welding method is favorable for maintaining the cleanliness of the environment, and has good welding reliability.

In the process of welding the electrode terminal 332 and the bus bar 20 by the welding device, it is necessary to maintain the stability of the relative positions of the two, and therefore, the pressing device 41 is provided to make the pressing device 41 press the bus bar 20 against the electrode terminal 332 in the first direction X, so that the welding operation of the welding device can perform the welding operation on the corresponding bus bar 20 and the electrode terminal 332 through the through hole 41a.

After the welding device completes the welding operation of the electrode terminal 332 and the bus bar 20 corresponding to one position, the pressing device 41 releases the corresponding bus bar 20 and moves a preset distance to the welding position of the next electrode terminal 332 and the bus bar 20. It is understood that the welding device and the pressing device 41 may be displaced together or separately, and the distance of displacement is specifically set according to the distance between the adjacent electrode terminals 332 or the bus bars 20 to be welded.

Since the distance that the welding device and the pressing device 41 move may be preset, when the pitch between the battery cells 30 is deviated, the through hole 41a thereof may not necessarily be able to face the welding position of the bus bar 20 and the electrode terminal 332 by only the movement of the pressing device 41 itself. At this time, the displacement compensation means 42 is provided to compensate for the displacement of the pressing means 41 so that the through hole 41a of the pressing means 41 faces the welding position of the electrode terminal 332 and the bus bar 20.

It should be noted that the second direction Y may be any direction perpendicular to the first direction X, and a direction in which the cells 30 are most likely to have a gap deviation during the arrangement process may be set as the second direction Y. Therefore, the second direction Y may be one direction or a plurality of directions, and similarly, the displacement compensation device 42 may compensate for the displacement of the pressing device 41 in one direction or compensate for the displacement of the pressing device 41 in a plurality of directions.

It is understood that the displacement compensation of the pressing device 41 by the displacement compensation device 42 may be a positive displacement compensation or a negative displacement compensation, that is, the pressing device 41 may be compensated along two opposite directions of the second direction Y, which is selected according to actual requirements.

According to the welding device provided by the embodiment of the application, the displacement compensation device 42 is arranged, and the displacement compensation device 42 is connected with the pressing device 41, so as to adjust the displacement of the pressing device 41 along the second direction Y, so that the through hole 41a of the pressing device 41 is over against the welding position of the bus bar 20 and the electrode terminal 332. Therefore, the welding device can effectively weld the electrode terminal 332 and the bus bar 20, so that the single batteries 30 form a reliable series or parallel loop, and the product quality of the battery 10 is improved.

Alternatively, the welding equipment may include one pressing device 41, or may include a plurality of pressing devices 41, and when the welding equipment includes one pressing device 41, after the welding device completes the welding operation at each station, the welding device waits for the pressing device 41 to complete the pressing operation at the next station, and then performs the welding operation.

In some optional embodiments, the welding apparatus includes a plurality of pressing devices 41, and the plurality of pressing devices 41 are arranged at intervals in the second direction Y.

It can be understood that, by providing a plurality of pressing devices 41, a plurality of pressing devices 41 can be operated alternately, and when the welding device completes the welding operation in one station, the through hole 41a of the pressing device 41 in the next station is already aligned with the welding position of the electrode terminal 332 and the bus bar 20 to be welded, and the pressing operation is completed, and the welding device can enter the next station for welding operation. With such an arrangement, the time for the welding device to wait for the position adjustment and the pressing operation of the pressing device 41 is reduced, the utilization rate of the welding device is improved, and the production efficiency of the battery 10 is improved.

It can be understood that the specific number of the pressing devices 41 can be set according to the sum of the time for the pressing devices 41 to complete the welding position of the via hole 41a to align the bus bar 20 with the electrode terminal 332, the time for pressing the corresponding bus bar 20 and the electrode terminal 332, and the time required for the welding device to complete the welding of one station, so as to further reduce the waiting time of the welding device and further improve the production efficiency of the battery 10.

Alternatively, in an embodiment where the welding apparatus includes a plurality of pressing devices 41, a part of the pressing devices 41 may be provided with the displacement compensation device 42, or a separate displacement compensation device 42 may be provided for each pressing device 41, as long as the displacement compensation of the pressing device 41 can be achieved.

In some embodiments, a displacement compensation device 42 is disposed corresponding to each pressing device 41.

That is, each pressing device 41 can be compensated for displacement, so that the through hole 41a of each pressing device 41 can be aligned with the welding position of the electrode terminal 332 and the bus bar 20 in the process of pressing the electrode terminal 332 and the bus bar 20, and thus, the accuracy of the welding position of the welding device can be further improved, and the reliability of the connection of the bus bar 20 and the electrode terminal 332 and the product quality of the battery 10 can be further improved.

It is understood that each pressing device 41 may be provided with a displacement compensation device 42, and a displacement compensation device 42 may also be provided to respectively compensate for the displacements of a plurality of pressing devices 41, which may be selected according to specific requirements, and is not limited herein.

In some alternative embodiments, the displacement compensation device 42 comprises a driving member 421, and the driving member 421 is connected to the pressing device 41 for driving the displacement of the pressing device 41 along the second direction Y.

Specifically, the driving member 421 may be a servo motor, a stepping motor, a hydraulic cylinder, a pneumatic cylinder, or the like. The displacement compensation device 42 comprises the driving member 421, and the driving member 421 drives the pressing device 41 to move along the second direction Y, so that the movement of the pressing device 41 along the second direction Y can be more accurate, and the accuracy of the displacement compensation device 42 for the pressing device 41 can be improved.

The specific structure of the pressing device 41 is not limited as long as it can press the electrode assembly 32 and the bus bar 20 and allow a welding device to pass through the through hole 41a of the pressing device 41 to perform a welding operation on the electrode assembly 32 and the bus bar 20.

As shown in fig. 6 to 8, in some embodiments, the pressing device 41 includes a connection plate 411, a pressing head 412, and an elastic member 413. The press head 412 movably penetrates the connection plate 411 in the first direction X and serves to press the bus bar 20 against the electrode terminal 332. The via hole 41a penetrates the ram 412 in the first direction X. The elastic member 413 is disposed between the pressing head 412 and the connection plate 411.

Specifically, the connection plate 411 may serve as a bearing member for the pressing head 412, the elastic member 413, and the like, and bear the weight of the pressing head 412 and the elastic member 413, and move the pressing head 412 and the bearing member. The displacement compensation device 42 may be connected to the connection plate 411, and the connection plate 411 drives the pressing head 412 and the elastic member 413 to move.

In the process of pressing the bus bar 20 and the electrode terminal 332 by the pressing head 412, if the pressing force of the pressing head 412 is too large, the pressing force applied by the pressing head 412 is transmitted to the elastic member 413, and the pressing force between the pressing head 412 and the bus bar 20 is relieved by the deformation of the elastic member 413. With this arrangement, the pressing force between the pressure head 412 and the bus bar 20 and the electrode terminal 332 can be relieved by the elastic member 413, reducing the risk of damage to the bus bar 20 and the electrode terminal 332 by the pressure head 412.

It is understood that the elastic member 413 may be a spring, a rubber member, or the like, which is not limited herein.

Alternatively, one connecting plate 411 may be provided with one pressing head 412, and a plurality of pressing heads 412 may be provided, without limitation.

In some embodiments, the connection plate 411 is provided with a plurality of indenters 412, and the plurality of indenters 412 are spaced apart.

Specifically, the welding device passes through one through hole 41a of one ram 412 at a time to weld the bus bar 20 and the electrode terminal 332. The interval distance of the plurality of taps 412 may be set according to the interval distance between the battery cells 30, so that the electrode assemblies 32 of the plurality of battery cells 30 and the corresponding bus bars 20 may be simultaneously pressed by the plurality of taps 412. By providing the plurality of pressing heads 412 on the connecting plate 411, the displacement compensation device 42 can perform displacement compensation on the plurality of pressing heads 412 at one time without performing displacement compensation for multiple times, thereby further improving the working efficiency of the welding equipment.

Alternatively, one through hole 41a may be provided in one of the press heads 412, or a plurality of through holes 41a may be provided, and in an embodiment where one through hole 41a is provided in one of the press heads 412, after the welding device completes the welding operation of the bus bar 20 and the electrode terminal 332 in the corresponding through hole 41a, the bus bar 20 and the electrode terminal 332 in the corresponding through hole 41a in the other press head 412 are welded. In the embodiment where the plurality of through holes 41a are provided in one of the pressing heads 412, the welding device may weld the electrode terminal 332 and the bus bar 20 in the through hole 41a corresponding to another one of the pressing heads 412 after the connection between the electrode terminal 332 and the bus bar 20 in all the through holes 41a corresponding to one of the pressing heads 412 is completed.

In some embodiments, one indenter 412 is provided with a plurality of vias 41a, and the plurality of vias 41a are spaced apart.

Specifically, one through hole 41a corresponds to one electrode terminal 332, a plurality of through holes 41a may correspond to two electrode terminals 332 of the same battery cell 30, or correspond to a plurality of electrode terminals 332 of a plurality of battery cells 30, and the interval of the through holes 41a may be set according to the interval between adjacent electrode terminals 332 of adjacent battery cells 30, or may be set according to the interval between two electrode terminals 332 of the same battery cell 30, and may be selected as required.

It will be appreciated that by providing a plurality of through holes 41a on one ram 412, the time and distance of displacement of the device can be welded, further improving the production efficiency of the cell 10.

The specific structure of the pressure head 412 is not limited as long as it can press the bus bar 20 and the electrode terminal 332.

In some alternative embodiments, the ram 412 includes an outer sleeve 4121 and an inner sleeve 4122. The outer sleeve 4121 includes an outer cylinder 41211 and a mounting portion 41212 protruded from an outer circumferential surface of the outer cylinder 41211, the mounting portion 41212 being for mounting the elastic member 413. The outer cylinder 41211 serves to press the bus bar 20 against the electrode terminals 332. At least a portion of the inner sleeve 4122 extends into the outer cylinder 41211 and is connected to the outer cylinder 41211, and the inner sleeve 4122 is formed with a through hole 41a. The mounting portion 41212 has an inlet 4121a and an outlet 4121b, the inlet 4121a is used for inputting inert gas, and an overflow passage 4121c for communicating the inlet 4121a and the outlet 4121b is formed between the outer cylinder 41211 and the inner cylinder 4122.

Specifically, the outer sleeve 4121 and the inner sleeve 4122 are hollow cylindrical bodies, and may be provided with the same thickness or with variable thicknesses in the circumferential direction. The shape of the inner and outer surfaces thereof may be cylindrical, truncated cone, etc.

Illustratively, the inner surface of the outer sleeve 4121 and the outer surface of the inner sleeve 4122 are both frustoconical surfaces, and the outer surface of the inner sleeve 4122 and the inner surface of the outer sleeve 4121 are arranged in parallel such that the cross-sectional area of the flow passage 4121c is not changed, which is advantageous in maintaining the balance of the pressure of the inert gas in the flow passage 4121c.

Alternatively, the flow passages 4121c may be provided around a circumference of the inner sleeve 4122, or may be provided around at least a portion of the circumference of the inner sleeve 4122. The inert gas enters the flow passage 4121c through the inlet 4121a, flows through the welding location, and is discharged through the outlet 4121 b.

Alternatively, the inert gas may be any gas that is not susceptible to oxidation-reduction reactions at high temperatures, such as nitrogen and the like.

It can be understood that the flow passage 4121c is provided to facilitate the input of the inert gas to the welding position of the bus bar 20 and the electrode terminal 332, so that the risk of oxidation of the bus bar 20 and the electrode terminal 332 during the welding process is reduced, which is beneficial to improving the welding quality.

Alternatively, the elastic member 413 may directly connect the pressing head 412 and the connection plate 411, or may abut against the connection plate 411 through an intermediate connection member.

In some embodiments, the pressing head 412 further includes a guiding post 4123, the guiding post 4123 is disposed on the mounting portion 41212, and the resilient member 413 is sleeved on the guiding post 4123.

When the pressing head 412 applies pressure to the elastic member 413, the elastic member 413 is deformed, and the direction in which the elastic member 413 is deformed or the direction in which the elastic member 413 is deformed is restored can be guided by the guide post 4123. Illustratively, the guide post 4123 extends along the first direction X, and the elastic member 413 deforms or recovers to deform along the first direction X. In this way, the pressing head 412 is moved along the preset direction relative to the welding position of the bus bar 20 and the electrode assembly 32, so that the position of the through hole 41a of the pressing head 412 is conveniently controlled, and the accuracy of the welding position is favorably ensured.

As shown in fig. 7 and 9, in some embodiments, the welding apparatus further includes a dust removing device 43, the dust removing device 43 includes a negative pressure mechanism (not shown) and a dust removing duct 431, and the dust removing duct 431 penetrates through the outer cylinder 41211 and the inner cylinder to connect the negative pressure mechanism with the through hole 41a.

Specifically, the negative pressure mechanism is used to provide negative pressure, and the welding device generates particles or dust and splashes into the through hole 41a during welding of the bus bar 20 and the electrode assembly 32 through the through hole 41a. Through setting up dust removal pipeline 431 and communicating via hole 41a and negative pressure mechanism, the dust of the welding slag in via hole 41a can get into negative pressure mechanism through dust removal pipeline 431 along with the air current under negative pressure mechanism's negative pressure effect, and then the granule or the dust that produce in the welding process are collected, so, reduce the contaminated risk of confluence piece 20 and electrode terminal 332's welding position.

Because inert gas needs to be introduced in the welding process, and in order to ensure the stability of welding quality, the more stable the flow rate of the inert gas is, the better the flow rate is, and therefore, the influence of ambient wind on the flow rate of the inert gas needs to be eliminated.

In view of this, as shown in fig. 10, in some embodiments, the welding apparatus further comprises an anemometer 44, the anemometer 44 being used to measure the wind speed of the dust duct 431.

The wind speed flowing into the through hole 41a is measured by the anemometer 44, so that the wind speed of the through hole 41a can be controlled to intervene, and the possibility that the welding quality is influenced by overlarge wind speed is reduced.

It will be appreciated that the anemometer 44 may be disposed at any location where the wind speed within the via 41a may be detected, and that the anemometer 44 is illustratively disposed above the via 41a. In this manner, the accuracy of the anemometer 44 in measuring wind speed may be improved.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (10)

1. A welding apparatus for welding electrode terminals of battery cells and a bus bar, comprising:

a welding device;

a pressing device for pressing the bus bar against the electrode terminals in a first direction, the pressing device having a through hole through which the welding device welds the bus bar and the electrode terminals;

and the displacement compensation device is connected with the pressing device and used for adjusting the displacement of the pressing device along a second direction so that the through hole is over against the welding position of the bus piece and the electrode terminal, wherein the second direction is vertical to the first direction.

2. The welding apparatus according to claim 1, wherein the welding apparatus comprises a plurality of the pressing devices, the plurality of the pressing devices being arranged at intervals in the second direction.

3. The welding apparatus according to claim 2, wherein each of the pressing devices is provided with the displacement compensation device.

4. Welding apparatus according to claim 1 wherein the displacement compensation means comprises a drive member connected to the pressing means for driving the pressing means in the second direction.

5. Welding apparatus according to any one of claims 1 to 4 wherein the hold down device comprises:

a connecting plate;

a pressure head movably penetrating the connection plate in the first direction and pressing the bus bar against the electrode terminal, the via hole penetrating the pressure head in the first direction;

the elastic piece is arranged between the pressure head and the connecting plate.

6. The welding apparatus as defined in claim 5, wherein the web is provided with a plurality of the indenters, the plurality of indenters being spaced apart; and/or the presence of a gas in the gas,

one pressure head sets up a plurality of the via hole, it is a plurality of the via hole interval sets up.

7. The welding apparatus of claim 5, wherein the ram comprises:

an outer sleeve including an outer cylinder and a mounting portion protruding from an outer circumferential surface of the outer cylinder, the mounting portion being configured to mount the elastic member, the outer cylinder being configured to press the bus bar against the electrode terminal;

the inner sleeve at least partially extends into the outer cylinder body and is connected with the outer cylinder body, and the inner sleeve is provided with the through hole;

the installation department is equipped with air inlet and gas outlet, the air inlet is used for inputing inert gas, outer barrel with form between the inner skleeve and be used for the intercommunication the air inlet with the passageway that overflows of gas outlet.

8. The welding apparatus of claim 7, wherein the ram further comprises a guide post disposed on the mounting portion, and wherein the spring is disposed on the guide post.

9. The welding apparatus according to claim 7, further comprising a dust removal device, wherein the dust removal device comprises a negative pressure mechanism and a dust removal pipe, and the dust removal pipe penetrates through the outer cylinder and the inner sleeve to communicate the negative pressure mechanism with the via hole.

10. The welding apparatus of claim 9, further comprising an anemometer configured to measure a wind speed of the dust extraction duct.

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