CN218414957U

CN218414957U - Battery, battery module and electric equipment

Info

Publication number: CN218414957U
Application number: CN202222247946.0U
Authority: CN
Inventors: 王静霞; 董红文; 王烽
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2023-01-31
Anticipated expiration: 2032-08-25

Abstract

The application discloses battery, battery module and consumer, the battery includes: the battery comprises a battery body, a pole lug, a current collecting component and a protective layer. The tab is connected with the battery body; the current collecting component comprises a switching part, and the pole lug is connected with the switching part; the protective layer is adhered to the lug and the switching part. The protective layer can fix the tab and the switching part, and the tab is prevented from being turned over, curled, torn, aged, slag and the like.

Description

Battery, battery module and electric equipment

Technical Field

The present application generally relates to the field of battery technology, and more particularly, to a battery, a battery module and an electric device.

Background

With the increasing perfection of the electric automobile technology, the electric automobile is closer to the daily life of people. Electric vehicles have higher requirements on the safety performance of lithium ion batteries providing energy for the electric vehicles, and the requirements on the energy density of battery cells are higher and higher.

The current collecting component of the battery is used for connecting the battery cover plate and the battery core, and in order to improve the energy density of the electrode, the current collecting component of the battery in the prior art is welded with the electrode lugs of the electrode assembly, and then the electrode lugs are turned over onto the current collecting component, so that the occupied internal space is reduced, and the energy density of the electrode assembly is improved.

However, after the current collecting member is welded with the tab, welding slag at the transfer welding position of the current collecting member and the tab is easy to fall into the battery, the welding slag easily causes micro short circuit inside the battery, the electrochemical performance and the yield of the battery are affected, and the battery may be short-circuited in severe cases, so that the potential safety hazards of ignition and explosion of the battery are brought.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

A main aim at of this application provides a battery, battery module and consumer can fix utmost point ear and switching portion, avoids utmost point ear to appear turning over a book, curling, tearing, ageing condition such as the sediment that falls.

In order to achieve the purpose of the application, the following technical scheme is adopted in the application:

according to an aspect of the present application, there is provided a battery including:

a battery body;

the tab is connected with the battery body;

the current collecting component comprises a switching part, and the pole lug is connected with the switching part;

and the protective layer is bonded on the lug and the switching part.

The battery that this embodiment provided, because utmost point ear coiling, the unavoidable condition that has utmost point ear marginal part dislocation when buckling, after utmost point ear and switching portion are connected, utmost point ear marginal area is in the marginal state of weak state utmost point ear, bonds the protective layer in utmost point ear and switching portion on, can fix utmost point ear and switching portion, avoids utmost point ear to receive the exogenic action and turns over a condition such as turning over appears, curling, tearing, ageing falling the sediment to the reliability of battery has been promoted.

According to an embodiment of the application, on the length direction of switching portion, utmost point ear is in among the orthographic projection's on the switching portion both ends, one end is located the protective layer is in between the orthographic projection's on the switching portion both ends, the other end with the protective layer is in the orthographic projection's on the switching portion tip parallel and level or be located the protective layer is in between the orthographic projection's on the switching portion both ends.

The battery that this embodiment provided, utmost point ear all covers between the ascending both ends of length direction of switching portion has formed the complete cover of antipodal ear in length direction, can further improve and fix utmost point ear and switching portion, avoids utmost point ear to receive exogenic action to appear turning over a book, curling, tearing, ageing condition such as the sediment that falls, further effectively avoids weld zone welding sediment, the ageing bad impurity that produces of utmost point ear to get into inside the battery.

According to an embodiment of the present application, in a length direction of the transition portion, the protective layer covers at least a portion of the transition portion at both ends of the tab.

According to the battery provided by the embodiment, the protective layers extend out from the two sides of the lug and are bonded on the switching part, so that the area covered by the protective layers is increased, the edges of the two sides of the lug can be fixed on the switching part through the protective layers, and the fixation of the lug and the switching part is further improved.

According to an embodiment of the application, the end of the adapter portion is provided with a protruding structure facing one side of the tab, and the protective layer does not cover the protruding structure.

The battery that this embodiment provided sets up protruding structure through the tip at the switching portion, can provide the support when welding for utmost point ear and switching portion, keeps welding stability and atress even.

According to an embodiment of the present application, an orthogonal projection of the protection layer on a plane where the adapter portion is located within an orthogonal projection of the adapter portion on the plane.

The battery that this embodiment provided, in the width direction of switching portion, the width of protective layer equals or is less than the width of switching portion to appear rolling up the condition appearance of the lower adhesion of stick up when avoiding the great protruding border of switching portion of protective layer width.

According to one embodiment of the application, the battery comprises a plurality of groups of tabs, each group of tabs comprises at least one tab, and the plurality of groups of tabs are respectively connected with the adapter part;

the battery comprises a plurality of protective layers which are bonded on the plurality of groups of tabs in a one-to-one correspondence manner.

The battery provided by the embodiment adopts the protective layers to be adhered to the multiple groups of tabs in a one-to-one correspondence manner, so that the self strength of the protective layers can be improved under the condition of ensuring the adhesion degree of the protective layers, the tabs and the switching part, and the protection capability of the tabs and the switching part is improved.

According to an embodiment of the present application, there is an overlapping region between adjacent protection layers.

The battery provided by the embodiment has the advantages that the overlapping area is formed between the adjacent protective layers, so that the adjacent protective layers are connected, the edge warping of the protective layers is avoided, and the protective capacity of the protective layers is improved.

According to an embodiment of the present application, the battery includes two sets of tabs distributed in a width direction of the adapter portion; the protective layers on the two groups of tabs have an overlapping area in the width direction.

According to an embodiment of the present application, the protective layer is an insulating tape.

According to the battery provided by the embodiment, the protective layer is the insulating adhesive tape, so that the tab and the switching part can be fixed, the tab is prevented from being turned over, curled, torn, aged and slag-falling under the action of external force, and the reliability of the battery is improved; on the other hand, impurities generated by welding slag in a welding area and poor tab aging can be effectively prevented from entering the battery.

According to an embodiment of the application, the tab is welded to the adapter.

According to the battery provided by the embodiment, after the lug is welded with the adapter part, impurities generated by welding slag in a welding area and poor lug aging can be effectively prevented from entering the battery through the protective layer.

According to another aspect of the present application, there is provided a battery module including the above-described battery.

The battery module that this embodiment provided, because utmost point ear in the battery is convoluteed, the unavoidable condition that has utmost point ear marginal part dislocation when buckling, after utmost point ear and switching portion are connected, the marginal zone that utmost point ear marginal zone is in weak state utmost point ear is in weak state, bond the protective layer in utmost point ear and switching portion, can fix utmost point ear and switching portion, avoid utmost point ear to receive exogenic action to appear turning over a book, curling, tear, ageing circumstances such as sediment that fall to the reliability of battery module has been promoted.

According to still another aspect of the present application, a powered device is provided, and the powered device includes the above battery module.

The consumer that this embodiment provided, because utmost point ear in the battery is convoluteed, the unavoidable condition that has utmost point ear marginal part dislocation when buckling, after utmost point ear and switching portion are connected, the marginal zone that utmost point ear marginal zone is in weak state utmost point ear is in weak state, bond the protective layer in utmost point ear and switching portion, can fix utmost point ear and switching portion, avoid utmost point ear to receive exogenic action to appear turning over a book, curling, tearing, ageing circumstances such as sediment that fall to the reliability of consumer has been promoted.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic view of a battery provided in one embodiment of the present application;

fig. 2 is a side view of a battery provided in one embodiment of the present application;

FIG. 3 is a schematic view of a current collecting member provided by one embodiment of the present application;

fig. 4 is a schematic view of a current collecting member provided in another embodiment of the present application.

Description of reference numerals:

10. a battery;

100. an end cap assembly; 110. a current collecting member; 1110. a switching part; 1120. a pole connecting part; 1130. a raised structure; 1140. a tab connecting part; 120. a cover plate; 130. a safety valve; 140. a liquid injection hole; 150. a pole column;

200. an electric core; 210. a battery body; 220. a tab;

300. and a protective layer.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a detailed description thereof will be omitted.

In the examples of this application, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the examples of the application can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred devices or units must have a specific direction, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application.

In the description herein, the description of the term "one embodiment" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiment or example. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

An embodiment of the present application first provides a battery, as shown in fig. 1 and 2, the battery 10 including: battery body 210, tab 220, current collecting member 110 and protective layer 300, wherein tab 220 is connected to battery body 210, current collecting member 110 includes adapter 1110, tab 220 is connected to adapter 1110, and protective layer 300 is bonded to tab 220 and adapter 1110.

The application provides a battery 10, because utmost point ear 220 convolutes, the condition that can't avoid having utmost point ear 220 marginal part dislocation when buckling, after utmost point ear 220 is connected with switching portion 1110, utmost point ear 220 marginal zone is in weak state, bond protective layer 300 on utmost point ear 220 and switching portion 1110, can fix utmost point ear 220 and switching portion 1110, avoid utmost point ear 220 to receive exogenic action and turn over a book, curl, tear, ageing condition such as sediment that falls, thereby the reliability of battery has been promoted.

Specifically, as shown in fig. 1, the battery 10 includes: a cell 200 and an end cap assembly 100. The battery cell 200 includes the battery body 210 and the tab 220. The end cap assembly 100 includes a cap plate 120 and two current collecting members 110 located at both ends of the cap plate 120, one of the two current collecting members 110 being a positive current collecting member, the other being a negative current collecting member; the positive current collecting member 110 is connected to the positive electrode post 150 of the cap plate 120 through the post connection portion 1120, and the negative current collecting member is connected to the negative electrode post 150 of the cap plate 120 through the post connection portion 1120. The cover plate 120 is further provided with a safety valve 130 and a liquid injection hole 140.

As shown in fig. 3, the current collecting member 110 includes: the tab comprises an adapter 1110 and a pole connecting part 1120, wherein the pole connecting part 1120 is connected with the adapter 1110, and the pole connecting part 1120 is used for being connected with the pole 150, so that the tab 220 is electrically connected with the pole 150; the post connecting portion 1120 is connected to the adaptor portion 1110 to form an L-shape.

The pole connecting portion 1120 and the switching portion 1110 can be of an integrated structure, and the pole connecting portion 1120 and the switching portion 1110 can be formed by a whole metal plate through processes of die cutting, bending and the like. By making the pole connecting portion 1120 and the adaptor portion 1110 be an integral structure, the connection strength of the pole connecting portion 1120 and the adaptor portion 1110 is improved, and further the strength of the current collecting member 110 is improved; meanwhile, the conductivity of the current collecting member 110 is ensured, and the influence on the conductivity of the current collecting member 110 caused by the excessive resistance of the connection part when the pole connection part 1120 is connected with the adapter part 1110 by welding, bonding and the like is avoided.

In one embodiment of the present application, the tab 220 is welded to the transition portion 1110. For example, the tab 220 is joined to the adapter 1110 by laser welding or ultrasonic welding. Welding slag residues are easily formed around a welding area when the lug 220 is welded, the residual welding slag is easily dropped into the battery, the internal micro short circuit of the battery is caused, the electrochemical performance and the yield of the battery are influenced, and the battery short circuit can be caused in serious conditions, so that the safety risk of ignition and explosion of the battery is brought. By adding the protective layer 300, impurities generated by welding slag in a welding area and poor tab aging can be effectively prevented from entering the battery.

In an embodiment of the present application, the battery cell 200 is a winding battery cell, and the winding battery cell includes: the battery comprises a first pole piece, a first diaphragm, a second pole piece and a second diaphragm, wherein the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are alternately overlapped and wound to form a battery body; and a second tab is arranged on each circle of the second pole piece body, and the second tab groups are formed by overlapping a plurality of second tabs. The first pole ear group and the second pole ear group may be located at two ends of the electrical core 20 around the axis, and are respectively connected to the current collecting member 110.

Specifically, the battery 10 may include a plurality of sets of tabs, each set of tabs including at least one tab 220, the plurality of sets of tabs being connected to the adaptor 1110 respectively; the battery 10 includes a plurality of protective layers 300, and the plurality of protective layers 300 are adhered to the plurality of sets of tabs in a one-to-one correspondence.

When each group of tabs comprises a plurality of tabs 220, the tabs 220 are bonded to the plurality of groups of tabs in a one-to-one correspondence manner through the plurality of protective layers 300 under the condition that the edge parts of the tabs are staggered after being wound and overlapped, on one hand, the tabs 220 and the switching part 1110 can be fixed, and the tabs 220 are prevented from being turned over, curled, torn, aged and slag-falling under the action of external force, so that the reliability of the battery is improved; on the other hand, impurities generated by welding slag in a welding area and poor tab aging can be effectively prevented from entering the inside of the battery.

Of course, when the battery 10 includes a plurality of sets of tabs, the plurality of sets of tabs may be covered simultaneously by one protective layer 300; this application adopts a plurality of protective layers 300 one-to-one to bond on multiunit utmost point ear, can increase the laminating degree of protective layer 300 and utmost point ear 220 and switching portion 1110, has avoided the stair structure between utmost point ear 220 and the switching portion 1110 to cause protective layer 300 unsettled and reduce the bonding effect.

Of course, each group of tabs 220 may be covered by a plurality of protective layers 300. This application adopts a plurality of protective layers 300 one-to-one to bond on multiunit utmost point ear, can improve protective layer 300's self intensity under the condition of guaranteeing with protective layer 300 and utmost point ear 220 and the laminating degree of switching portion 1110 to promote the protective capacities to utmost point ear 220 and switching portion 1110.

When the battery 10 may include a plurality of tab sets, the plurality of protective layers 300 are adhered to the tab sets in a one-to-one manner, so that an overlapping area is formed between the adjacent protective layers 300, and thus the adjacent protective layers 300 are connected to avoid edge warping of the protective layers 300, thereby improving the protection capability of the protective layers 300.

For example, as shown in fig. 1 and fig. 2, the battery may include two winding type battery cells 200, a set of tabs is respectively disposed on end portions of the two battery cells 200, two tab sets are disposed at the same end after the two battery cells 200 are stacked together, the two tab sets are located at two sides of the width direction X of the adapting portion 1110 when not being welded to the current collecting member 110, and after being turned over to the adapting portion 1110, the two tab sets do not overlap with each other, so as to avoid that the tabs 220 are not turned over in place due to mutual influence. Of course, two sets of tabs or more sets of tabs may be formed on the end of one battery cell 200 by winding, which is not limited in the present application.

Specifically, in the length direction Y of the adapter 1110, one end of the tab 220 is located between the two ends of the orthographic projection of the protective layer 300 on the adapter 1110, and the other end of the tab is flush with the end of the orthographic projection of the protective layer 300 on the adapter 1110 or located between the two ends of the orthographic projection of the protective layer 300 on the adapter 1110, that is, the tab 220 is covered with the protective layer 300 between the two ends of the tab 220 in the length direction Y of the adapter 1110, and the protective layer 300 forms a complete covering of the tab 220 in the length direction Y, so that the tab 220 and the adapter 1110 can be further fixed, the tab 220 is prevented from being turned over, curled, torn, aged and slag and the like due to external force, and further, welding slag in the welding zone and impurities generated due to poor tab aging are effectively prevented from entering the inside of the battery.

In the length direction Y of the transition portion 1110, the protective layer 300 covers at least part of the transition portion 1110 at both ends of the tab 220, that is, the protective layer 300 extends out from both sides of the tab 220 and is bonded on the transition portion 1110, so that the area covered by the protective layer 300 is increased, both side edges of the tab 220 can be fixed on the transition portion 1110 by the protective layer 300, and the fixation of the tab 220 and the transition portion 1110 is further improved. Of course, the protection layer 300 covers at least a portion of the transition portion 1110 at one end of the tab 220 along the length of the transition portion 1110, which is not limited in the present application.

Specifically, as shown in fig. 1 and 3, the end of the adaptor 1110 is provided with a raised structure 1130 facing the tab 220, and the protective layer 300 does not cover the raised structure 1130. The end of the adapter 1110 is provided with the boss 1130, so that support can be provided for welding the tab 220 and the adapter 1110, and welding stability and uniform stress can be maintained.

The transition portion 1110 is further disposed between the bump structure 1130 and the tab 220, the protective layer 300 extends to one side of the bump structure 1130, the protective layer 300 is flush with the edge of the bump structure 1130 or has a smaller gap, and the protective layer 300 does not cover the bump structure 1130, so as to prevent the protective layer 300 from curling when covering the bump structure 1130 to reduce the bonding performance, and ensure the stability of bonding the protective layer 300 with the tab 220 and the transition portion 1110.

Specifically, the orthographic projection of the protective layer 300 on the plane where the adapter 1110 is located in the orthographic projection of the adapter 1110 on the plane, that is, in the width direction X of the adapter 1110, the width of the protective layer 300 is equal to or less than the width of the adapter 1110, so that the situation that the protective layer 300 is warped and has low adhesiveness when the protective layer 300 protrudes from the edge of the adapter 1110 with a large width.

For example, when two sets of tabs 220 are provided, two protection layers 300 are correspondingly provided, and the edges of the two protection layers 300 in the width direction X of the adapter 1110 are respectively flush with the edges of the adapter 1110 or have a gap, so as to prevent the edges of the protection layers 300 from protruding out of the adapter 1110.

In the width direction X of the adapter 1110, the gap between the protective layer 300 and the edge of the adapter 1110 may be 0-5mm, for example, 1mm, 2mm, 3mm, 4mm, 5mm, etc., which is not listed herein; of course, the gap between the protective layer 300 and the edge of the adapter 1110 may also be greater than 5mm, which is not limited in the present application.

The shape of the adapter 1110 is rectangular, the protection layer 300 is matched with the shape of the adapter 1110 to increase the coverage area of the protection layer 300, and the protection layer 300 may also be rectangular. Of course, the shape of the protection layer 300 may also be trapezoidal, triangular, segmental or irregular, and all changes in the shape of the protection layer 300 are within the scope of the present application.

The thickness of the protective layer 300 may be, for example, 30 μm to 60 μm, such as 30 μm, 40 μm, 50 μm, 60 μm, etc., which are not listed herein; of course, the thickness of the protection layer 300 may be less than 30 μm or greater than 60 μm, which is not limited in the present application.

The protective layer 300 may be an insulating tape, which may be a glued polypropylene film (PP), polyethylene film (PE), polyimide film (PI), or polyvinyl chloride film (PVC); of course, the protective layer can also be other insulating films with the bonding function, and all protective layers which can perform bonding and fixing and prevent impurities generated by welding from entering the battery are all within the protection scope of the application.

In another embodiment of the application, as shown in fig. 4, the current collecting member 110 further includes a tab connection portion 1140, the tab connection portion 1140 is connected with the adaptor portion 1110, the tab 220 is welded with the tab connection portion 1140, and the tab 220 is electrically connected with the adaptor portion 1110 through the tab connection portion 1140.

Specifically, after the tab 220 is welded to the tab connection portion 1140, a tab welding portion formed by the tab 220 and the tab connection portion 1140 is folded onto the adapter 1110, and then the tab welding portion and the adhesive portion are fixed together by the protective layer 300, and meanwhile, impurities generated in the tab welding portion are prevented from entering the battery.

The tab connection portion 1140 and the adaptor portion 1110 may be an integrated structure, and the tab connection portion 1140 and the adaptor portion 1110 may be formed by a single metal plate through processes such as die cutting and stamping. The tab connection part 1140 is formed through a stamping process, so that the tab connection part 1140 can be folded, and the situation that the tab connection part 1140 is broken due to folding is further avoided. Of course, the tab connection portion 1140 and the adaptor portion 1110 may be formed separately and connected together by welding, bonding, or the like.

Further, the tab connection portion 1140, the adaptor portion 1110 and the tab connection portion 1120 may be an integrated structure, and the tab connection portion 1140, the adaptor portion 1110 and the tab connection portion 1120 may be formed by a single metal plate through processes of die cutting, stamping and the like. The tab connection part 1140 is formed through a stamping process, so that the tab connection part 1140 can be folded, and the situation that the tab connection part 1140 is broken due to folding is further avoided; meanwhile, the connection strength of the tab connection part 1140, the adapter part 1110 and the tab connection part 1120 is improved, and the strength of the current collecting member 110 is further improved; in addition, the conductivity of the current collecting member 110 is ensured, and the problem that the conductivity of the current collecting member 110 is affected due to excessive resistance at the connection part when the tab connection part 1140 is connected with the adaptor part 1110 and the tab connection part 1120 by welding, bonding or the like is avoided. Of course, the tab connection portion 1140 may be formed separately from the adaptor portion 1110 and the tab connection portion 1120, and may be connected together by welding, bonding, or the like.

In an embodiment of the present application, a chamfer is provided on a side edge of the adapter 1110, and a chamfer is provided to remove foreign matters such as burrs on a side edge of the adapter 1110, so as to prevent the tab 220 from being scratched by the foreign matters such as burrs on the side edge of the adapter 1110. The chamfer surface of the chamfer can be a plane or an arc surface.

Embodiments of the present application also provide a battery module including the above-described battery 10, such as a battery pack. The application provides a battery module, because the utmost point ear in the battery is convoluteed, the unavoidable condition that has utmost point ear marginal part dislocation when buckling, after utmost point ear and switching portion are connected, utmost point ear marginal area is in weak state, bonds the protective layer in utmost point ear and switching portion, can fix utmost point ear and switching portion, avoids utmost point ear to receive the exogenic action appearance to turn over a book, curl, tear, ageing circumstances such as sediment that fall to the reliability of battery module has been promoted.

For more details and advantages of the battery module of the present application, please refer to the discussion related to the battery embodiments above, which is not repeated herein.

Embodiments of the present application further provide a power-driven device, which includes the above battery module, and the power-driven device is, for example, a vehicle or an energy storage device. The application provides a consumer, because the utmost point ear in the battery is convoluteed, the unavoidable condition that has utmost point ear marginal part dislocation when buckling, after utmost point ear and switching portion are connected, utmost point ear marginal area is in weak state, bonds the protective layer in utmost point ear and switching portion, can fix utmost point ear and switching portion, avoids utmost point ear to receive the exogenic action appearance to turn over a book, curl, tear, ageing circumstances such as sediment that fall to the reliability of consumer has been promoted.

For more details and advantages of the electric device of the present application, please refer to the discussion about the battery embodiment above, which is not repeated herein.

The above description is only a preferred embodiment of the claimed embodiments and is not intended to limit the claimed embodiments, and various modifications and changes may be made to the claimed embodiments by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the applied embodiment shall be included in the protection scope of the applied embodiment.

Claims

1. A battery, comprising:

a battery body;

the tab is connected with the battery body;

and the protective layer is bonded on the lug and the switching part.

2. The battery of claim 1, wherein in the length direction of the transition portion, one of the two ends of the orthographic projection of the tab on the transition portion is located between the two ends of the orthographic projection of the protective layer on the transition portion, and the other end of the tab is flush with the end of the orthographic projection of the protective layer on the transition portion or located between the two ends of the orthographic projection of the protective layer on the transition portion.

3. The battery of claim 2 wherein the protective layer covers at least a portion of the transition portions at both ends of the tab in the lengthwise direction of the transition portions.

4. The battery as set forth in claim 1, wherein the end of the transition portion is provided with a protrusion structure facing one side of the tab, and the protection layer does not cover the protrusion structure.

5. The battery of claim 1, wherein an orthographic projection of the protective layer on a plane of the interposer is located within an orthographic projection of the interposer on the plane.

6. The battery of claim 1, wherein the battery includes a plurality of sets of tabs, each set of tabs including at least one of the tabs, the plurality of sets of tabs being connected to the transition portion, respectively;

the battery comprises a plurality of protective layers, and the protective layers are bonded on the multiple groups of tabs in a one-to-one correspondence mode.

7. The battery of claim 6, wherein adjacent protective layers have an overlap region therebetween.

8. The battery of claim 6, wherein the battery includes two sets of tabs distributed across the width of the transition; the protective layers on the two groups of tabs have an overlapping area in the width direction.

9. The battery of claim 1, wherein the protective layer is an insulating tape.

10. The battery of claim 1 wherein the tabs are welded to the transition.

11. A battery module comprising the battery according to any one of claims 1 to 10.

12. An electric device, characterized by comprising the battery module according to claim 11.