CN216720236U - Switching piece, battery monomer, battery and power consumption device - Google Patents

Abstract

The utility model relates to an adapter plate, a battery monomer, a battery and an electric device. Wherein the electricity consuming device is driven by a battery; the battery is composed of a plurality of battery monomers; the battery monomer comprises a shell, an electrode assembly, a top cover and a switching piece, wherein the shell is provided with an accommodating cavity; the electrode assembly is accommodated in the accommodating cavity; the top cover is connected with the electrode assembly through the adapter sheet. The adapter plate comprises a laser welding area and an ultrasonic welding area, one end of the ultrasonic welding area is directly or indirectly connected with the laser welding area, the size of at least part of the ultrasonic welding area along the width direction is smaller than that of the laser welding area along the width direction, and the size of the ultrasonic welding area along the thickness direction is larger than that of the laser welding area along the thickness direction. So that at least part of the ultrasonic welding area can bear larger current, and the local overcurrent capacity can be improved. And a space is reserved for the subsequent installation of the adapter plate and the single electrode lug of the battery, so that a higher design space is provided for the electrode assembly, and the energy density of the electrode assembly is improved.

Description

Switching piece, battery monomer, battery and power consumption device

Technical Field

The utility model relates to the technical field of new energy batteries, in particular to a switching piece, a battery monomer, a battery and an electricity utilization device.

Background

With the increasing environmental pollution, the awareness of environmental protection of people is gradually strengthened, and at the moment, the new energy industry rapidly rises, so that a wide space is provided for the application and development of lithium ion batteries, more and more electric equipment select the lithium ion batteries as power sources, and the lithium ion batteries used in the electric equipment are generally called power batteries. The power battery is generally connected with an electrode assembly and a pole lug of the power battery through an adapter sheet, and the adapter sheet is used for preventing the battery from being damaged or other components from being burnt when the electrode assembly is in short circuit or over-charged and over-discharged, so that the use safety of the battery can be ensured.

The method is limited by the current welding process conditions, the thickness of the adapter plate in the area welded with the pole is required not to be too thick, otherwise, the phenomena of welding penetration, cold welding, explosion and the like are easy to occur to influence the welding. But the difference between the thickness of the connecting area of the produced adapter plate and the pole lug and the thickness of the welding area of the adapter plate and the pole is very small, so that the thickness of the adapter plate in the prior art in the welding area of the adapter plate and the pole is not too thick. Therefore, the adapter sheet can ensure the local overcurrent capacity of current only by having enough width in the area connected with the pole lug, the adapter sheet is required to be lapped on the top of the pole lug due to the excessively wide width of the area, and the height of the effective membrane width of the electrode assembly can be reduced only under the condition that the overall size of the battery is not changed, so that the energy density of the electrode assembly is sacrificed, and the utilization rate of the electrode assembly space is not improved.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides an adaptor sheet for a battery cell, a battery and an electric device, which aims to solve the problems of low energy density of an electrode assembly and low space utilization rate of the electrode assembly of a power battery in the prior art.

In a first aspect, the present application provides an interposer for a battery cell, including a laser welding region for connecting an electrode terminal and an ultrasonic welding region; one end of the ultrasonic welding area is directly or indirectly connected with the laser welding area, and the ultrasonic welding area is used for connecting the pole lug; at least part of the ultrasonic welding area is smaller than the laser welding area in the width direction, and the size of the ultrasonic welding area in the thickness direction is larger than the size of the laser welding area in the thickness direction; the width direction, the thickness direction and the current overflowing direction are perpendicular to each other.

In the technical scheme of this application embodiment, through dividing into laser weld zone and ultrasonic welding district with the adapter plate to make the thickness of at least partial ultrasonic welding district be greater than laser weld zone's thickness, make laser welding zone under the unchangeable condition of thickness maintenance, the cross-sectional area of at least partial ultrasonic welding district promptly the area of overflowing can obtain increasing, therefore this partial ultrasonic welding district can bear bigger electric current, this partial local overcurrent capacity also can obtain improving consequently. Therefore, the ultrasonic welding area of the part can be narrowed in the width direction, a space is reserved for the subsequent installation of the adapter sheet and the electrode lug of the battery, a higher design space is provided for the electrode assembly, and the energy density of the electrode assembly is improved.

The technical solution of the present application is further described below:

in one embodiment, the ultrasonic welding area and the laser welding area abut against each other, and a connecting portion of the ultrasonic welding area and the laser welding area forms a step.

Form through making the switching piece by the concatenation of at least two independent panels, wherein a panel is as laser weld zone, and at least another panel is as making ultrasonic welding district for ultrasonic welding district can support each other when interconnect with laser weld zone and lean on, thereby can freely control the width and the thickness of every panel, make the thickness in ultrasonic welding district thicken wantonly, the width can reduce wantonly narrowly, can reach the above-mentioned purpose of reserving the space for the utmost point ear installation of follow-up switching piece and battery. The problem that the difference in thickness between the ultrasonic welding area and the laser welding area is small due to the fact that the thickness of the laser welding area cannot be too thick and the difference in thickness of the existing rolling process cannot exceed 20% is solved, when the thickness of the ultrasonic welding area is larger than that of the laser welding area, the two plates abut against each other to form a step, the ultrasonic welding area and the laser welding area can form a large difference in thickness, the local overcurrent capacity of the ultrasonic welding area can be improved, the width of the ultrasonic welding area can be narrowed, and therefore the purpose of improving the space utilization rate of the electrode assembly is achieved.

In one embodiment, the laser welding zone and the ultrasonic welding zone have steps on both sides in the thickness direction at their connection portions.

When the adapter plate is designed in a split mode, at least two independent plates are abutted to each other to be connected, especially when steps are formed on the upper side and the lower side of the thickness direction of the adapter plate, the upper side and the lower side of the connection part of the ultrasonic welding area and the laser welding area can be fixedly connected with each other, and therefore the connection of the ultrasonic welding area and the laser welding area is firmer.

In one embodiment, the ultrasonic welding zone and the laser welding zone are in welded connection, the step having a weld seam for welding, the weld seam being provided with a weld impression.

The plates with different thicknesses are abutted to each other, so that the difference in thickness between the different plates can form a step, the step can be formed with a welding seam for welding, the plates with different thicknesses can be conveniently and fixedly connected together in a welding connection mode, and the laser welding area and the ultrasonic welding area can be conveniently and quickly and stably connected in a mutual fixed connection mode.

In one embodiment, the adapter sheet further comprises a fusing area, one end of the fusing area is connected with the ultrasonic welding area, the other end of the fusing area is connected with the laser welding area, and the sectional area of the cross section formed by the fusing area in the thickness direction and the width direction is smaller than the sectional area of the cross section formed by the ultrasonic welding area in the thickness direction and the width direction.

When the fuse region is not arranged on the adapter plate, the electrode assembly is short-circuited or the current is over-charged and over-discharged, so that the adapter plate is fused at any position. Through setting up the fusing zone again at the switching piece, the sectional area of the common cross-section that constitutes of thickness direction and width direction in fusing zone is less than the sectional area of the common cross-section that constitutes of thickness direction and width direction in ultrasonic welding district, therefore the fusing zone is comparatively weak in ultrasonic welding district, fusing zone can take the lead to fusing when electrode subassembly short circuit or electric current overcharge overdischarge, laser weld zone is connected to the one end in fusing zone simultaneously, ultrasonic weld zone is connected to the other end, make the user can all realize the differentiation design of thickness and width in the different positions of switching piece, thereby can freely control the fusing position of switching piece, avoid making the switching piece fusing at the sensitive position of battery, and then can guarantee the safety that the battery used better.

In one embodiment, the thickness ratio of the laser weld zone to the ultrasonic weld zone is equal to the width ratio of the ultrasonic weld zone to the laser weld zone.

When only the width of the ultrasonic welding zone is reduced, the flow area is reduced, and thus the charging ability and power of the electrode assembly cannot be secured. The thickness ratio of the laser welding area to the ultrasonic welding area and the width ratio of the ultrasonic welding area to the laser welding area are set to be equal, so that the ratio of the thickness increase of the ultrasonic welding area to the width decrease of the ultrasonic welding area is equal, the flow area of the ultrasonic welding area can be kept unchanged, and the charging capacity and power of the electrode assembly can be guaranteed.

In a second aspect, the present application provides a battery cell including the above interposer, the battery cell further including a case, an electrode assembly, and a top cap. Wherein the shell is provided with an accommodating cavity with one open end; the electrode assembly is accommodated in the accommodating cavity; the top cover is connected with the electrode assembly through the adapter sheet and covers the opening.

Since most of the raw materials of the electrode assembly are polymer gel electrolytes, which may be liquid electrolytes, or solid polymer electrolytes, if the electrode assembly is exposed, the performance of the electrode assembly may be damaged by various external environments, and the electrolyte in the electrode assembly may pollute the environment, thereby causing potential safety hazards. The single battery is provided with the shell and the top cover, and the electrode assembly is accommodated in the accommodating cavity of the shell, so that the electrode assembly can be effectively protected, the pollution to the external environment is avoided, and the safety accident is avoided.

In one embodiment, the electrode assembly has two spaced apart tabs, and the top cap has two spaced apart electrode terminals, each of which is connected to one of the tabs of the electrode assembly by an interposer.

The electrode terminal and the lug are connected by the adapter sheet instead of being directly connected, so that the adapter sheet can be fused when the electrode assembly is short-circuited, overcharged or overdischarged, the current transmission between the electrode terminal and the lug is interrupted, the battery is prevented from being damaged or other parts are prevented from being burnt when the electrode assembly is short-circuited or overcharged and overdischarged, and the use safety of the battery can be ensured.

In one embodiment, the laser weld area of each adapter sheet is connected to one electrode terminal and the ultrasonic weld area of each adapter sheet is connected to one tab.

Because the thickness of the adapter plate at the part connected with the electrode terminal cannot be too thick, otherwise, the welding of the adapter plate and the electrode terminal is affected by the phenomena of welding through, false welding, explosion and the like, the adapter plate must have a certain thickness difference at the two parts connected with the electrode terminal and the pole lug, otherwise, the flow area is small due to the small integral sectional area of the adapter plate, and the charging capacity and the power of the electrode assembly cannot be ensured. Through dividing into laser weld zone and ultrasonic bonding zone with the switching piece, make laser weld zone connection electrode terminal, ultrasonic bonding zone connects utmost point ear, just so can make laser weld zone have thin thickness and can not take place to weld and wear, phenomenon influences welding such as rosin joint and explosion, can also make ultrasonic bonding zone have thicker thickness simultaneously to guarantee that ultrasonic bonding zone has great overcurrent area and then guarantee electrode assembly's charging ability and power.

In one embodiment, each tab comprises two sub-tabs arranged at intervals, a mounting position is respectively formed between the two ends of the ultrasonic welding area of each adapter sheet in the width direction and the shell, and each sub-tab is partially accommodated in one mounting position.

The width of the ultrasonic welding area of the adapter sheet is reduced, so that an installation position is formed between each of two ends of the ultrasonic welding area in the width direction and the shell, each sub-tab can be partially accommodated in one installation position, and an installation space can be reserved for a redundant part of the tab when the ultrasonic welding area is connected with the sub-tabs.

In one embodiment, the ultrasonic welding region of each adapter sheet simultaneously connects two of the sub-tabs of one tab, and the surface of the ultrasonic welding region facing the electrode assembly is closer to the electrode assembly than the top end of each sub-tab.

Just because the width of the ultrasonic welding area is reduced, an installation position is formed between the end part of the ultrasonic welding area along the width direction and the shell, so that a space is reserved for the redundant part of the electrode lug, when the ultrasonic welding area is connected with the sub-electrode lugs, the surface of the ultrasonic welding area facing the electrode assembly is closer to the electrode assembly than the top end of each sub-electrode lug, a certain height is reserved in a battery unit, more space can be reserved for the design of the electrode assembly by the reserved height, under the condition that the shell is not changed, the effective film width of the electrode assembly can be integrally increased, and the energy density of the electrode assembly is improved.

In a third aspect, the present application provides a battery including the battery cell of the above embodiment.

In one embodiment, a plurality of battery cells are stacked in sequence and grouped in series or parallel to form a battery.

The battery is formed by overlapping a plurality of battery monomers, so that the energy density of the battery is higher, and the battery has stronger cruising ability.

In a fourth aspect, the present application provides an electric device, which includes the battery of the above embodiment, and the battery provides power for the electric device, so that the electric device has high safety, and can automatically disconnect a power supply when short circuit occurs in a charging process or a using process, thereby improving the safety of the electric device in use; and this consumer has more lasting duration of use simultaneously, can once carry out the next charge again after the lasting use of longer time.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

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

Fig. 1 is a schematic perspective view of an interposer according to a first embodiment of the present invention;

FIG. 2 is an exploded view of an interposer according to a second embodiment of the present invention;

FIG. 3 is a top view of an interposer shown in a third embodiment of the present invention;

FIG. 4 is a top view of an interposer shown in a fourth embodiment of the present invention;

fig. 5 is an exploded view of a battery cell according to an embodiment of the present invention;

fig. 6 is a schematic view of the connection of an interposer and a tab according to a first embodiment of the present invention;

fig. 7 is a cross-sectional view of a battery cell according to an embodiment of the present invention;

fig. 8 is an enlarged view of the area a in fig. 7.

Description of reference numerals:

10. a battery cell; 100. a housing; 101. an installation position; 200. an electrode assembly; 210. a tab; 211. a sub-tab; 2111. a fixed part; 2112. a bending section; 2112a, a first horizontal zone; 2112b, bending zone; 2112c, a second horizontal zone; 2113. an extension portion; 300. a top cover; 310. a cover body; 320. an electrode terminal; 330. plastic is discharged; 400. a patch; 410. a laser welding zone; 420. a fuse region; 430. an ultrasonic welding zone.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

With the increasing environmental pollution, the environmental awareness of people is gradually strengthened, and at the moment, the new energy industry rapidly rises, so that a wide space is provided for the application and development of lithium ion batteries. Lithium ion batteries have the characteristics of high energy density, long cycle life, good charge-discharge rate performance and the like, and are widely applied, and more electric devices such as mobile phones, notebook computers, electric tools, electric automobiles and the like select the lithium ion batteries as power supplies, and the lithium ion batteries used in the electric devices are generally called power batteries. The power battery is generally provided with a positive pole column, a negative pole column and two pole lugs connected with the positive pole column and the negative pole column respectively, the positive pole column and the negative pole column are used for outputting current and being connected with an external circuit, and the normal electrification of the power battery can be ensured by connecting the pole columns with the pole lugs. When the power battery is assembled, the pole lugs are generally connected with the pole posts in a welding mode through the adapter pieces, wherein the adapter pieces are used for preventing the battery from being damaged or other parts from being burnt when the electrode assembly is in short circuit or overcharged and overdischarged, so that the use safety of the battery can be ensured.

The inventor of the application notices that the thickness of the adapter plate in the area welded with the pole is required not to be too thick due to the current welding process condition, otherwise, the phenomena of welding penetration, false welding, explosion and the like are easy to occur to influence the welding, and meanwhile, the risk of falling of welding slag is possibly accompanied. However, the difference of the rolling thickness cannot exceed 20% due to the bottleneck of the rolling process, so that the difference of the thickness of the connection region between the produced adapter plate and the tab and the thickness of the connection region between the adapter plate and the post in the prior art is very small, and the thickness of the connection region between the adapter plate and the post in the prior art cannot be too thick, so that the adapter plate has enough width in the connection region between the adapter plate and the tab to ensure the local overcurrent capacity of the current. Therefore, a problem arises in that the width of the connection part of the adaptor sheet to the tab is too wide, so that the adaptor sheet needs to be lapped on the top of the tab, and the height of the effective membrane width of the electrode assembly can only be reduced under the condition that the overall size of the battery is not changed, so that the energy density of the electrode assembly is sacrificed, and the utilization rate of the electrode assembly space is not improved.

In order to solve the problem, the inventor of the present application has studied and found that the structure of the rotor plate can be optimally designed. Particularly, can make switching piece and utmost point ear welded region can have thicker thickness, make switching piece and utmost point ear welded region and switching piece and utmost point ear welded regional thickness difference can be comparatively obvious, thereby make the regional ability of overflowing also obtain improving consequently, the switching piece just can narrow down in the width direction after this regional ability of overflowing improves, make the space has been left with the utmost point ear installation of battery to the switching piece, thereby switching piece and utmost point ear welded region can limit mounting inside utmost point ear, just so reached and increased the height of the effective membrane width of electrode subassembly, the energy density of electrode subassembly has been promoted, and the purpose of electrode subassembly space utilization has been improved.

Based on the above consideration, in order to solve the problems of low energy density of the electrode assembly and low space utilization rate of the electrode assembly in the battery in the prior art, the inventors of the present application have conducted extensive research to design an interposer for a battery cell, the interposer including a laser welding region for welding with an electrode terminal of the battery and an ultrasonic welding region for welding with a tab. The laser welding area and the ultrasonic welding area are different in thickness, the shape and the width of the ultrasonic welding area can be freely adjusted, and a fusing area can be added on the adapter plate, so that the bottleneck that the thickness difference of the integrated adapter plate in the prior art cannot exceed 20% can be avoided. On the premise of ensuring the same overcurrent capacity, the thicknesses and the widths of the switching sheets in different areas can be respectively defined, more spaces are reserved for electrode assembly design and tab redundancy, the improvement of the energy density of the electrode assembly is facilitated, and the freedom and the operable space are increased for the design of a battery.

The adapter sheet disclosed in the embodiment of the application can be used for all batteries including battery cells and electric equipment including the batteries, but is not limited to be used for the battery cells, and the adapter sheet disclosed in the embodiment of the application can also be used for fusing protection of other products in short circuit or overlarge current, and can increase freedom and operable space for product design.

As shown in fig. 1 and 2, an interposer 400 for a battery cell according to the first and second embodiments of the present disclosure includes a laser welding region 410 and an ultrasonic welding region 430. As shown in fig. 1, 2 and 5, the laser welding area 410 is a rectangular thin plate-like structure for connecting the electrode terminals 320 of the battery cells 10, the electrode terminals 320 being used for current output of the battery cells 10 and connection with an external circuit; the ultrasonic welding region 430 is also a rectangular thin plate structure, one end of which is directly or indirectly connected to the laser welding region 410, the ultrasonic welding region 430 is used for connecting the tab 210 of the battery cell 10, and the tab 210 is used for connecting with the electrode terminal 320, so as to ensure that the battery cell 10 can be normally energized; at least a portion of the ultrasonic bonding region 430 has a dimension in the width direction smaller than that of the laser bonding region 410, and a dimension in the thickness direction larger than that of the laser bonding region 410. The width direction is the direction of the shorter side length of the laser welding area 410 or the ultrasonic welding area 430, the thickness direction is the direction of the height of the laser welding area 410 or the ultrasonic welding area 430, the current flowing direction is the direction in which the laser welding area 410 points to the ultrasonic welding area 430, the width direction, the thickness direction and the current flowing direction are perpendicular to each other, the X direction is the width direction, the Y direction is the current flowing direction, and the Z direction is the thickness direction.

It is understood that the laser welding area 410 and the ultrasonic welding area 430 may be integrally formed, and when the laser welding area 410 and the ultrasonic welding area 430 are integrally formed, the laser welding area 410 and the ultrasonic welding area 430 may have a large thickness difference through a stamping and upsetting process or a cutting process, so that it is possible to make the size of the ultrasonic welding area 430 in the thickness direction larger than that of the laser welding area 410 and reduce the width size of the ultrasonic welding area 430 while ensuring that the flow area is not changed. It is also understood that the laser welding area 410 and the ultrasonic welding area 430 may not be integrally formed, but may be formed by splicing two plates with different thicknesses, and when the laser welding area 410 and the ultrasonic welding area 430 are two plates with different thicknesses, the thickness and the width of the two plates may be freely designed, so that the size of the ultrasonic welding area 430 in the thickness direction may be larger than the size of the laser welding area 410 in the thickness direction, and the width of the ultrasonic welding area 430 may be reduced while the flow area is not changed.

It is also understood that the thickness of the entire area of the ultrasonic bonding region 430 may be greater than the thickness of the laser bonding region 410 and the width may be less than the thickness of the laser bonding region 410, or the thickness of a partial area of the ultrasonic bonding region 430 may be greater than the thickness of the laser bonding region 410 and the width may be less than the thickness of the laser bonding region 410.

It will also be appreciated that when the thickness of the partial area of the ultrasonic bonding region 430 is greater than the thickness of the laser bonding region 410, as shown in fig. 3 and 4, the shape of the interposer 400 can be freely designed into different forms in the drawings, resulting in a multi-gradient profile shape of the interposer 400.

In the above scheme, the adapter sheet 400 is divided into the laser welding area 410 and the ultrasonic welding area 430, and the thickness of at least part of the ultrasonic welding area 430 is greater than that of the laser welding area 410, so that the cross-sectional area, i.e., the flow area, of at least part of the ultrasonic welding area 430 can be increased under the condition that the thickness of the laser welding area 410 is maintained unchanged, and therefore the part of the ultrasonic welding area 430 can bear larger current, and the local flow capacity of the part can be improved. Therefore, the ultrasonic welding region 430 of the portion can be narrowed in the width direction, so as to leave a space for mounting the subsequent adaptor sheet 400 and the tab 210 of the battery, which is beneficial to providing a higher design space for the electrode assembly 200 of the single battery 10 and improving the energy density of the electrode assembly 200 in the single battery 10.

And when the adapter plate 400 is in a multi-gradient and special-shaped design shape, the adapter plate 400 can be connected with the tabs 210 in different shapes, and different tab 210 welding modes can be met. Fig. 3 shows a third embodiment of the interposer 400, in which the interposer 400 and the tab 210 are welded together at the same side, and the shape of the interposer 400 is consistent along both sides in the width direction; fig. 4 shows a fourth embodiment of the interposer 400, in which the interposer 400 and the tab 210 are in a staggered manner, and the shape of the interposer 400 is different on both sides in the width direction.

In a specific arrangement, as shown in fig. 1, one end of the ultrasonic bonding region 430 in the current flowing direction is connected to one end of the laser bonding region 410 in the current flowing direction, so that the ultrasonic bonding region 430 and the laser bonding region 410 abut against each other, and a step is formed at a connecting portion of the ultrasonic bonding region 430 and the laser bonding region 410 due to the difference in thickness between the ultrasonic bonding region 430 and the laser bonding region 410.

It is understood that, in this embodiment, the ultrasonic welding area 430 and the laser welding area 410 are respectively formed by joining two separate plates having different thicknesses, wherein one side of the ultrasonic welding area 430 and one side of the laser welding area 410 in the thickness direction may be flush with each other, so that a step may be formed on one side of the two joining portions in the thickness direction, or both sides of the two joining portions in the thickness direction.

It is also understood that, when the ultrasonic welding area 430 and the laser welding area 410 are two separate plates with different thicknesses, the two plates may be connected by welding, bonding, screwing, or other connecting members, as long as the difference between the two thicknesses is greater than 20%, and the present invention is not limited thereto.

The adapter sheet 400 is formed by splicing at least two independent plates, wherein one plate is used as a laser welding area 410, and at least another plate is used as an ultrasonic welding area 430, so that the ultrasonic welding area 430 can be mutually abutted when being mutually connected with the laser welding area 410, the width and the thickness of each plate can be freely controlled, the thickness of the ultrasonic welding area 430 can be randomly thickened, the width can be randomly narrowed, and the purpose of reserving a space for the installation of the follow-up adapter sheet 400 and the tab 210 of the battery can be achieved. The problem that the difference in thickness between the ultrasonic welding area 430 and the laser welding area 410 is small due to the fact that the thickness of the laser welding area 410 cannot be too thick and the difference in thickness of the existing rolling process cannot exceed 20% is solved, when the thickness of the ultrasonic welding area 430 is larger than that of the laser welding area 410, two plates abut against each other to form a step, so that the ultrasonic welding area 430 and the laser welding area 410 can form a large difference in thickness, the local overcurrent capacity of the ultrasonic welding area 430 can be improved, the width of the ultrasonic welding area 430 can be narrowed, and the purpose of improving the space utilization rate of the electrode assembly 200 is achieved.

In a specific arrangement, the ultrasonic welding zone 430 and the laser welding zone 410 are welded, and the step has a weld for welding, and the weld is provided with a weld mark.

It is understood that the welding process of the ultrasonic welding zone 430 and the laser welding zone 410 may be friction stir welding or arc welding, and is not limited thereto.

Through making the panel of different thickness support each other and lean on for having the thickness difference between the different panels and can forming the step, and the step must be formed with and be used for welded welding seam, thereby can make between the panel of different thickness comparatively conveniently through welded connection's mode fixed connection together, and then make laser weld area 410 and ultrasonic welding district 430 can make things convenient for more when mutual fixed connection firm the connection fast.

In a particular arrangement, as shown in FIG. 2, interposer 400 further includes a fuse region 420, one end of fuse region 420 is connected to ultrasonic bonding region 430, and the other end is connected to laser bonding region 410, and the cross-sectional area of the cross-section of fuse region 420 formed by the thickness direction and width direction is smaller than the cross-sectional area of the cross-section of ultrasonic bonding region 430 formed by the thickness direction and width direction.

It is understood that when interposer 400 includes fuse region 420, ultrasonic bonding region 430 is indirectly connected to laser bonding region 410 via fuse region 420, fuse region 420 may be integrally formed with laser bonding region 410, and/or with ultrasonic bonding region 430; the fuse region 420 may also be a separate piece of material and laser welded region 410 and may be joined to the ultrasonic welded region 430.

It will also be appreciated that when the fuse region 420 is a separate piece of sheet material, the fuse region 420 may be welded, bonded, screwed, or otherwise attached to the laser weld zone 410 and/or the ultrasonic weld zone 430.

It can be further understood that, when the interposer 400 includes the fuse region 420, the dimensions of the laser welding region 410, the fuse region 420, and the ultrasonic welding region 430 in the current flowing direction can be adjusted arbitrarily on the premise that the overall length of the interposer 400 in the current flowing direction is not changed, so that the fuse region 420 can be located at any position of the interposer 400 in the current flowing direction.

It will also be understood that when the interposer 400 includes the fuse region 420, the cross-sectional area of the cross-section of the fuse region 420 formed in both the thickness direction and the width direction is smaller than the cross-sectional area of the laser welding region 410 and the cross-sectional area of the cross-section of the ultrasonic welding region 430 formed in the above-mentioned directions, so that the fuse region 420 is weaker than both the laser welding region 410 and the ultrasonic welding region 430, meaning that the fuse region 420 necessarily fuses first when the current is too large.

When the fuse region 420 is not provided in the interposer 400, the electrode assembly 200 may be broken or the current may be discharged too much, which may cause the fuse of the interposer 400 at any position. Through setting up fusing area 420 again at adaptor piece 400, fusing area 420 can be blown at first when electrode subassembly 200 short circuit or electric current overcharge put, laser weld area 410 is connected to the one end in fusing area 420 simultaneously, ultrasonic welding district 430 is connected to the other end, make the user can all realize the differentiation design of thickness and width in adaptor piece 400's different positions, thereby can freely control adaptor piece 400's fusing position, avoid making adaptor piece 400 fusing at the sensitive position of battery, and then can guarantee the safety that the battery used better.

In a specific embodiment, the ratio of the thickness of the laser weld zone 410 to the ultrasonic weld zone 430 is equal to the ratio of the width of the ultrasonic weld zone 430 to the laser weld zone 410.

It will be appreciated that in this embodiment, the width of the ultrasonic bonding region 430 is decreased by the same ratio as the thickness is increased, that is, the thickness of the ultrasonic bonding region 430 is increased by the same ratio as the width of the ultrasonic bonding region 430 is decreased, so that it is possible to ensure that the thickness ratio of the laser bonding region 410 to the ultrasonic bonding region 430 is equal to the width ratio of the ultrasonic bonding region 430 to the laser bonding region 410.

When only the width of the ultrasonic bonding pad 430 is reduced, the flow area is reduced, and thus the charging ability and power of the electrode assembly 200 cannot be secured. By setting the thickness ratio of the laser welding region 410 to the ultrasonic welding region 430 and the width ratio of the ultrasonic welding region 430 to the laser welding region 410 to be equal, the ratio of the increase in thickness to the decrease in width of the ultrasonic welding region 430 is made equal, so that the flow area of the ultrasonic welding region 430 can be ensured to be maintained, and the charging capability and power of the electrode assembly 200 can be ensured.

Referring now to fig. 2, an alternative embodiment of an interposer 400 provided herein is illustrated, the present application providing an interposer 400 for a battery cell. The interposer 400 includes a laser welding region 410, a fusing region 420 and an ultrasonic welding region 430, as shown in fig. 2 and 5, the laser welding region 410 is used for being welded with the electrode terminal 320 of the battery cell 10, the ultrasonic welding region 430 is used for being welded with the tab 210 of the battery cell 10, and the fusing region 420 is used for being fused at first when the current is too large, so as to perform a protection function. The interposer 400 is made of aluminum or copper.

Referring to fig. 2, the laser welding area 410, the fuse area 420 and the ultrasonic welding area 430 are connected end to end by welding, one end of the fuse area 420 is connected to the laser welding area 410 by welding, and the other end of the fuse area 420 is connected to the ultrasonic welding area 430 by welding.

Further, the thicknesses of the three plates are different, and since the thickness of the laser welding area 410 cannot be too thick, when the adapter 400 is made of aluminum, the thickness of the adapter 400 cannot exceed 1mm, and when the adapter 400 is made of copper, the thickness of the adapter 400 cannot exceed 0.8 mm; the thickness of the ultrasonic welding region 430 is greater than that of the laser welding region 410, the width of the ultrasonic welding region 430 is less than that of the laser welding region 410, and the ratio of the thickness of the ultrasonic welding region 430 to that of the laser welding region 410 and the ratio of the width of the laser welding region 410 to that of the ultrasonic welding region 430 are equal to each other and are greater than 1.25 (namely, the thickness difference between the ultrasonic welding region 430 and the laser welding region 410 is greater than 20%), so that the sufficient current overcurrent capacity of the ultrasonic welding region 430 can be ensured, and the purpose of reserving more space for cell design and tab 210 redundancy can be achieved. In order to blow the fusing region 420 first when the current is too large, the cross-sectional area of the fusing region 420 in the width direction needs to be smaller than the cross-sectional areas of the ultrasonic bonding region 430 and the laser bonding region 410 in the width direction. In the present embodiment, the width and thickness of the fuse region 420 are smaller than those of the laser welding region 410, and the width and thickness are smaller than those of the ultrasonic welding region 430, so that the fuse region 420 is first fused when the current is too large.

Furthermore, since the thicknesses of the laser welding region 410, the fusion region 420 and the ultrasonic welding region 430 are different from each other, an upper step and a lower step along the thickness direction of the interposer 400 are respectively formed at the connection portion of the laser welding region 410 and the fusion region 420 and at the connection portion of the ultrasonic welding region 430 and the fusion region 420, each step has a welding seam for welding connection, the welding seam surrounds the periphery of the connection portion, and accordingly, the welding seam has a welding mark left after welding.

With reference to fig. 5, the present application further provides a single battery 10, which includes the above-mentioned interposer 400, and the single battery 10 further includes a case 100, an electrode assembly 200, and a top cap 300. The housing 100 is a rectangular cuboid hollow thin shell structure and is provided with an accommodating cavity with one open end; the electrode assembly 200 is substantially in the shape of a rectangular cube, is accommodated in the accommodating cavity, and plays a role of storing electricity for the battery cell 10 through its own electrochemical reaction; the top cap 300 has a thin plate-like structure, covers the opening of the case 100, and is connected to the electrode assembly 200 through the interposer 400.

It is understood that the top cap 300 and the case 100 serve to protect the electrode assembly 200, and the top cap 300 may be fitted to the opening of the case 100 by means of a snap connection, a screw connection, or an adhesive.

Since the raw material of the electrode assembly 200 is mostly polymer gel electrolyte, which may be liquid electrolyte or solid polymer electrolyte, if the electrode assembly 200 is exposed, various external environments may damage the performance of the electrode assembly 200, and the electrolyte in the electrode assembly 200 may pollute the environment, thereby causing safety hazards. By providing the case 100 and the top cap 300 in the battery cell 10, the electrode assembly 200 is accommodated in the accommodating cavity of the case 100, so that the electrode assembly 200 can be effectively protected, and the external environment is prevented from being polluted and safety accidents are prevented from occurring.

In a specific arrangement, the electrode assembly 200 has two spaced tabs 210, the top cap 300 has two spaced electrode terminals 320, and each electrode terminal 320 is connected to one tab 210 of the electrode assembly 200 by one interposer 400.

It can be understood that the two electrode terminals 320 are respectively a positive pole and a negative pole of the battery cell 10, and are arranged at intervals along the current flowing direction, the positive pole and the negative pole are used for outputting current and connecting with an external circuit, and the two tabs 210 arranged at intervals are respectively connected with the positive pole and the negative pole, so that the normal power-on of the battery cell 10 can be ensured.

It can also be understood that two tabs 210 are respectively fixedly welded to one end of the electrode assembly 200 close to the opening of the case 100 at intervals along the current flowing direction, the top cap 300 is provided with two through holes arranged at intervals along the current flowing direction, one end of each electrode terminal 320 passes through one through hole and extends into the accommodating cavity of the case 100 to be connected with one tab 210, and the other end is exposed to the external environment for connection with an external circuit.

By connecting the electrode terminal 320 and the tab 210 by using the interposer 400 instead of directly connecting the electrode terminal 320 and the tab 210, the interposer 400 can be fused when the electrode assembly 200 is short-circuited, overcharged, or overdischarged, thereby interrupting current transmission between the electrode terminal 320 and the tab 210, preventing damage to a battery or burning of other components when short-circuited or overcharged, and further ensuring safety in use of the battery.

In a particular arrangement, as shown in fig. 6, the laser weld area 410 of each interposer 400 is coupled to one electrode terminal 320, and the ultrasonic weld area 430 of each interposer 400 is coupled to one tab 210.

It will be appreciated that the laser weld area 410 of each interposer 400 is joined by welding to one of the electrode terminals 320, and the ultrasonic weld area 430 of each interposer 400 is joined by welding to one of the tabs 210. Wherein the side of the laser welding region 410 away from the electrode assembly 200 is welded to the end of the electrode terminal 320 protruding into the receiving cavity, and the side of the ultrasonic welding region 430 close to the electrode assembly 200 is welded to the end of the tab 210 away from the assembly.

Since the thickness of the interposer 400 at the portion connected to the electrode terminal 320 cannot be too thick, otherwise, the soldering-through, cold welding, and explosion are likely to occur, which may affect the welding between the interposer 400 and the electrode terminal 320, the two portions of the interposer 400 connected to the electrode terminal 320 and the tab 210 must have a certain thickness difference, otherwise, the flow area is small due to the small overall sectional area of the interposer 400, and the charging capability and power of the electrode assembly 200 cannot be ensured. By dividing the adapter sheet 400 into the laser welding area 410 and the ultrasonic welding area 430, the laser welding area 410 is connected with the electrode terminal 320, and the ultrasonic welding area 430 is connected with the tab 210, so that the laser welding area 410 has a thin thickness without generating phenomena such as welding penetration, insufficient welding, explosion point and the like to affect welding, and meanwhile, the ultrasonic welding area 430 has a thick thickness to ensure that the ultrasonic welding area 430 has a large overflowing area and further ensure the charging capability and power of the electrode assembly 200.

In a specific arrangement, as shown in fig. 7, each tab 210 includes two sub-tabs 211 arranged at intervals in the width direction of the electrode assembly 200, a hollow gap having a certain space is formed between each end of the ultrasonic welding region 430 of each adapter sheet 400 in the width direction and the casing 100, the hollow gap is configured to form a mounting position 101, and each sub-tab 211 is partially received in one mounting position 101.

It is understood that each sub-tab 211 is welded to the electrode assembly 200 at one end in the height direction of the electrode assembly 200 and at the other end for welding with the ultrasonic welding region 430 of the interposer 400, and the height direction of the electrode assembly 200 coincides with the thickness direction of the interposer 400.

It can be further understood that the width of the ultrasonic welding region 430 of the interposer 400 is smaller than the distance between the inner walls of the case 100 along the width direction, so that two mounting locations 101 spaced along the width direction are formed by one end of the interposer 400 along the width direction and the inner wall of one end of the case 100 along the width direction, and the width of the ultrasonic welding region 430 is smaller than the distance between the two ends of one tab 210 along the width direction of the electrode assembly 200, so that one sub-tab 211 can be partially received in one mounting location 101.

By narrowing the width of the ultrasonic welding region 430 of the interposer 400, one mounting location 101 is formed between each of the two ends of the ultrasonic welding region 430 in the width direction and the housing 100, so that each sub-tab 211 can be partially accommodated in one mounting location 101, and when the ultrasonic welding region 430 is connected to the sub-tab 211, a mounting space can be reserved for a redundant portion of the tab 210.

In a specific arrangement, continuing to refer to fig. 7, the ultrasonic welding region 430 of each interposer 400 simultaneously connects two sub-tabs 211 of one tab 210, and the surface of the ultrasonic welding region 430 facing the electrode assembly 200 is closer to the electrode assembly 200 than the tip of each sub-tab 211.

It is understood that, as shown in fig. 8, each sub-tab 211 includes a fixing portion 2111, a bent portion 2112, and an extending portion 2113. Wherein one end of the fixing portion 2111 is fixedly welded to the top of the electrode assembly 200, and the other end is connected to the bent portion 2112; one end of the bent portion 2112 is connected to the fixing portion 2111, and the other end is connected to the extension portion 2113; the side of the extension portion 2113 remote from the electrode assembly 200 is fitted to the side of the ultrasonic weld zone 430 near the electrode assembly 200.

With continued reference to fig. 8, it can be further understood that the bending portion 2112 includes a first horizontal region 2112a, a bending region 2112b and a second horizontal region 2112c, the first horizontal region 2112a extends along the width direction of the electrode assembly 200, one end of the first horizontal region 2112a is fixedly connected to the fixing portion 2111, the other end of the first horizontal region 2112a is connected to one end of the bending region 2112b, the bending region 2112b is semi-circular, one end of the second horizontal region is connected to the first horizontal region 2112a, the other end of the second horizontal region 2112c is connected to the second horizontal region 2112c, the second horizontal region 2112c also extends along the width direction of the electrode assembly 200, the second horizontal region 2112c is parallel to the first horizontal region 2112a and is located on the bending region 2112b, and one end of the second horizontal region 2112c away from the same side as the bending region 2112b is connected to the extending portion 2113. Extension 2113 is for welding with ultrasonic weld region 430 of interposer 400, extension 2113 is parallel to first horizontal region 2112a and second horizontal region 2112c, and extension 2113 is at a distance from electrode assembly 200 that is less than the distance from second horizontal region 2112c to electrode assembly 200, but greater than the distance from first horizontal region 2112a to electrode assembly 200. Wherein, the width direction of the electrode assembly 200 is identical to the width direction of the interposer 400.

As such, when the ultrasonic welding region 430 is welded to one of the sub-tabs 211, the surface of the ultrasonic welding region 430 facing the electrode assembly 200 is closer to the electrode assembly 200 than the tip of each of the sub-tabs 211. When the top cover 300 is covered on the housing 100, the second horizontal region 2112c of the bent portion 2112 in each sub-tab 211 is directly attached to the lower plastic 330 of the top cover 300.

Just because the width of the ultrasonic welding region 430 is reduced, the mounting position 101 is formed between the end of the ultrasonic welding region 430 in the width direction and the case 100, so as to leave a space for the redundant part of the tab 210, so that when the ultrasonic welding region 430 is connected with the sub-tabs 211, the surface of the ultrasonic welding region 430 facing the electrode assembly 200 is closer to the electrode assembly 200 than the top end of each sub-tab 211, so that the top of each sub-tab 211 can be directly attached to the lower plastic 330 of the top cap 300, instead of attaching the lower plastic 330 of the top cap 300 from the side of the ultrasonic welding region 430 away from the tab 210, as in the conventional battery cell 10, so as to leave a certain height space in the battery cell 10, so that more space can be left for the design of the electrode assembly 200, and under the condition that the case 100 is not changed, the effective film width of the electrode assembly 200 can be increased as a whole, thereby improving the energy density of the electrode assembly 200.

Referring now to fig. 5-8, an alternative embodiment of the battery cell 10 provided herein is illustrated. As shown in fig. 5, the battery cell 10 provided herein includes a case 100, an electrode assembly 200, a top cap 300, and the interposer 400 of the above embodiment. The housing 100 has a receiving cavity with one end opened; the electrode assembly 200 is received in the receiving cavity; the top cap 300 is connected to the electrode assembly 200 through the interposer 400, and the top cap 300 covers the opening.

As shown in fig. 5 and 7, the top cap 300 includes a cap body 310, an electrode terminal 320, and a lower plastic 330. The cover body 310 is a thin plate structure and is provided with two through holes along the current overflowing direction; two electrode terminals 320 connected to the positive electrode and the negative electrode of the electrode assembly 200, respectively, one end of the electrode terminal 320 extending into the receiving cavity of the case 100 through the through hole of the cap 310 for connection with the electrode assembly 200; the other end is exposed to the external environment and is used for connecting with an external circuit. The lower plastic 330 is attached to one side of the cover 310 close to the accommodating cavity of the case 100 for insulating the cover 310 from the electrode assembly 200 or the interposer 400.

The electrode assembly 200 has two tabs 210 spaced apart from each other in the current flowing direction at an end thereof adjacent to the opening of the case 100, each tab 210 is connected to one electrode terminal 320 via one interposer 400, as shown in fig. 6, the laser welding region 410 of each interposer 400 is connected to one electrode terminal 320, and the ultrasonic welding region 430 of each interposer 400 is connected to one tab 210. Each tab 210 includes two sub-tabs 211 arranged at intervals in the width direction of the electrode assembly 200. Each sub-tab 211 includes a fixing portion 2111, a bent portion 2112, and an extending portion 2113. Wherein one end of the fixing portion 2111 is fixedly welded to the top of the electrode assembly 200, and the other end is connected to the bent portion 2112; one end of the bent portion 2112 is connected to the fixing portion 2111, and the other end is connected to the extending portion 2113; the side of the extension portion 2113 remote from the electrode assembly 200 is fitted to the side of the ultrasonic weld zone 430 near the electrode assembly 200.

As shown in fig. 8, the curved portion 2112 includes a first horizontal region 2112a, a curved region 2112b, and a second horizontal region 2112 c. The first horizontal region 2112a extends in the width direction of the electrode assembly 200, and has one end fixedly connected to the fixing portion 2111 and the other end connected to one end of the bent region 2112 b; the bending area 2112b is in a semicircular ring shape, one end of the bending area is connected with the first horizontal area 2112a, and the other end of the bending area is connected with the second horizontal area 2112 c; a second horizontal region 2112c also extends in the width direction of the electrode assembly 200, the second horizontal region 2112c is parallel to the first horizontal region 2112a and is located on the same side of the bent region 2112b as the first horizontal region 2112a, and one end of the second horizontal region 2112c remote from the bent region 2112b is connected to the extension portion 2113. Extension 2113 is for welding with ultrasonic weld region 430 of interposer 400, extension 2113 is parallel to first horizontal region 2112a and second horizontal region 2112c, and extension 2113 is at a distance from electrode assembly 200 that is less than the distance from second horizontal region 2112c to electrode assembly 200, but greater than the distance from first horizontal region 2112a to electrode assembly 200. Wherein, the width direction of the electrode assembly 200 is identical to the width direction of the interposer 400.

As such, when the ultrasonic welding region 430 is welded to one sub-tab 211, the surface of the ultrasonic welding region 430 facing the electrode assembly 200 is closer to the electrode assembly 200 than the tip of each sub-tab 211. When the top cap 300 is covered on the case 100, the second horizontal region 2112c of the bent portion 2112 of each sub-tab 211 is directly attached to the lower plastic 330 of the top cap 300, instead of attaching the lower plastic 330 of the top cap 300 from the side of the ultrasonic welding region 430 away from the tab 210 as in the conventional battery cell 10, so that a certain height space is given out in the battery cell 10, and more space is given out for designing the electrode assembly 200.

The present application also provides a battery (not shown) including the battery cell 10 of the above-described embodiment.

It can be understood that the battery is formed by stacking a plurality of battery cells 10 in series or in parallel, so that the energy density of the battery is higher and the battery has stronger cruising ability.

The present application also provides an electrical device (not shown) comprising a battery as described above, the battery being configured to power the electrical device.

It is understood that the electric device includes all devices that use a battery for endurance.

By using the battery of the embodiment, the electric device has higher safety, and the power supply can be automatically disconnected when short circuit occurs in the charging process or the using process, so that the use safety of the electric device is improved; and this consumer has more lasting duration of use simultaneously, can once carry out the next charge again after the lasting use of longer time.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (13)

1. An interposer for a battery cell, comprising:

a laser welding area for connecting the electrode terminals;

one end of the ultrasonic welding area is directly connected or indirectly connected with the laser welding area, and the ultrasonic welding area is used for connecting the pole lugs;

at least a part of the ultrasonic bonding region has a dimension in the width direction smaller than a dimension of the laser bonding region in the width direction and a dimension in the thickness direction larger than a dimension of the laser bonding region in the thickness direction;

the width direction, the thickness direction and the current overflowing direction are perpendicular to each other.

2. The interposer as recited in claim 1, wherein the ultrasonic bonding area and the laser bonding area abut against each other, and a connection portion of the ultrasonic bonding area and the laser bonding area forms a step.

3. The interposer as recited in claim 2, wherein the joining portion of the laser weld zone and the ultrasonic weld zone has the step on both sides in the thickness direction.

4. The interposer as recited in claim 2 or 3, wherein the ultrasonic weld zone and the laser weld zone are welded, the step having a weld for welding, the weld being provided with a weld impression.

5. The interposer as recited in claim 1, further comprising a fusing zone having one end connected to said ultrasonic bonding region and the other end connected to said laser bonding region, wherein a cross-sectional area of a cross-section of said fusing zone in said thickness direction and said width direction is smaller than a cross-sectional area of a cross-section of said ultrasonic bonding zone in said thickness direction and said width direction.

6. The interposer as recited in claim 1, wherein a ratio of a thickness of said laser weld area to said ultrasonic weld area is equal to a ratio of a width of said ultrasonic weld area to said laser weld area.

7. A battery cell comprising the interposer as recited in any one of claims 1 to 6, wherein the battery cell further comprises:

a housing having an accommodating chamber with one end open;

an electrode assembly housed in the housing cavity; and

the top cover is connected with the electrode assembly through the adapter sheet and covers the opening.

8. The battery cell as recited in claim 7 wherein the electrode assembly has two spaced apart tabs and the top cover has two spaced apart electrode terminals, each of the electrode terminals being connected to one of the tabs of the electrode assembly by one of the tabs.

9. The battery cell as recited in claim 8 wherein the laser weld area of each of the interposers is coupled to one of the electrode terminals and the ultrasonic weld area of each of the interposers is coupled to one of the tabs.

10. The battery cell as recited in claim 9, wherein each of the tabs comprises two sub-tabs spaced apart from each other, a mounting location is formed between each of the two ends of the ultrasonic welding region of each of the tabs in the width direction and the housing, and each of the sub-tabs is partially received in one of the mounting locations.

11. The battery cell as recited in claim 10, wherein the ultrasonic welding region of each of the transition sheets simultaneously connects two of the sub-tabs of one of the tabs, and a surface of the ultrasonic welding region facing the electrode assembly is closer to the electrode assembly than a top end of each of the sub-tabs.

12. A battery comprising a cell according to any one of claims 7 to 11.

13. An electric device comprising the battery of claim 12.

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