CN218783189U - Secondary battery - Google Patents

Abstract

The utility model provides a secondary battery, include: the single-cell assembly comprises a plurality of single cells which are sequentially arranged, each single cell comprises a single-cell body and a tab, each single-cell body is provided with a top surface and a first side surface and a second side surface which are oppositely arranged along the thickness direction of the single-cell assembly, the first side surface of each single-cell body is arranged close to the inner side of the single-cell assembly, and the second side surface of each single-cell body is arranged close to the outer side of the single-cell assembly; in the thickness direction of the electric core component, the lug extends from the position of the top surface close to the first side surface; the upper surface of the adapter plate is provided with an adapter plate pole, and the adapter plate is provided with a pole lug assembling part corresponding to the pole lug; each pole lug penetrates through the pole lug assembling part and then is connected with the upper surface of the adapter plate through bending. The utility model discloses secondary battery has reduced the secondary battery internal resistance, has promoted secondary battery's battery performance.

Description

Secondary battery

Technical Field

The utility model mainly relates to the technical field of batteries, especially, relate to a secondary battery.

Background

The secondary battery generally comprises a shell, a battery cell and a top cover, and an assembly structure inside the secondary battery generally places the battery cell horizontally, and at the moment, a tab of each battery cell also extends along the horizontal plane, and then performs welding and core combining actions. Two assembly methods are generally involved in the welding process: firstly, the pole ear is directly connected with the pole on the top cover; and secondly, an adapter plate is additionally arranged between the battery cell and the top cover, the pole lug is arranged below the adapter plate and is electrically connected with the adapter plate, and the adapter plate is electrically connected with the pole on the top cover. During the welding and assembling process, the battery core and the lug are always parallel to the adapter sheet or the top cover, and after the welding is completed, the lug is bent and the core is combined when the battery core is placed into the shell, so that the assembly of the secondary battery is completed. The common problem of the two assembling methods is that the tab is folded, and the folding of the tab can cause the following problems:

firstly, the battery cell needs to leave a tab folding space in the height direction, so that the space utilization rate in the height direction is low, and the energy density of the secondary battery is difficult to improve; the space of the folded tab is small, the paths from the tab to the switching piece are different in relaxation state, and the tab is redundant and sinks to cause the safety risk of short circuit of the secondary battery; thirdly, after the tabs are folded, the tabs are not supported, and the tabs are easily inserted into the pole pieces, so that the safety risk of short circuit of the secondary battery can be caused; fourthly, the pole ear is longer, the internal resistance of the battery is large, and the performance of the secondary battery is influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a secondary battery reduces the secondary battery internal resistance, promotes secondary battery's battery performance.

In order to solve the above technical problem, the utility model provides a secondary battery, include: the battery pack comprises a plurality of single batteries which are sequentially arranged, each single battery comprises a single battery body and a tab, each single battery body is provided with a top surface and a first side surface and a second side surface which are oppositely arranged along the thickness direction of the battery pack, the first side surface of each single battery body is close to the inner side of the battery pack, and the second side surface of each single battery body is close to the outer side of the battery pack; in the thickness direction of the electric core assembly, the lug extends out from the position of the top surface close to the first side surface; the upper surface of the adapter plate is provided with an adapter plate pole, and the adapter plate is provided with a pole lug assembling part corresponding to the pole lug; and each tab penetrates through the tab assembling part and is connected with the upper surface of the adapter plate through bending.

Optionally, the upper surface of the interposer is divided into a first area and a second area by a separation line extending in the thickness direction of the electrical core assembly, and the interposer pole is located in the first area; the tab assembly parts corresponding to two single cores close to the innermost side of the core assembly are positioned in the second area; being close to that two single electric cores of electricity core subassembly innermost correspond utmost point ear assembly portion is followed the width direction of electricity core subassembly has first projection, switching piece utmost point post is followed the width direction of electricity core subassembly has the second projection, the second projection covers first projection.

Optionally, the tab assembling parts are all located in the second area, or at least part of the tab assembling parts corresponding to two single electric cores close to the outermost side of the electric core assembly are located in the first area, and the rest of the tab assembling parts are all located in the second area.

Optionally, the tab assembling part includes a tab assembling hole; the tab assembling holes comprise a first tab assembling hole and/or a second tab assembling hole, the first tab assembling hole is used for enabling a tab on one single core in the core assembly to pass through, the first tab assembling hole is provided with a third projection area along the height direction of the core assembly, and the tab corresponding to the first tab assembling hole is positioned in the third projection area; the second pole lug assembly hole is used for enabling the pole lugs on a plurality of adjacent single electric cores in the electric core assembly to penetrate, the second pole lug assembly hole is provided with a fourth projection area along the height direction of the electric core assembly, and the pole lugs corresponding to the second pole lug assembly hole are all located in the fourth projection area.

Optionally, along the thickness direction of the electric core assembly, the two single-cell tabs close to the innermost side of the electric core assembly correspond to one second pole tab assembling hole, so that the two single-cell tabs close to the innermost side of the electric core assembly pass through one second pole tab assembling hole.

Optionally, the secondary battery includes two of the adaptor pieces, each of the adaptor pieces has a first side and a second side extending in a thickness direction of the battery cell assembly, and in at least one of the adaptor pieces, the tab fitting hole has an opening at the first side; after the adapter plate and the electric core assembly are assembled, the first side edge of each adapter plate faces the first side edge of the other adapter plate.

Optionally, the tab assembling portion further includes a side recessed portion and/or a side assembling portion, the side recessed portion is located on a side of the adaptor sheet extending along a width direction of the electric core assembly, the side recessed portion is recessed into the adaptor sheet along a thickness direction of the electric core assembly, and the side recessed portion is used for enabling a corresponding tab to pass through the side recessed portion and to be bent towards the inside of the adaptor sheet; the side assembling part is positioned on the side edge of the adapter plate extending along the width direction of the electric core assembly, and the side assembling part is used for enabling the corresponding pole lug to penetrate through the side edge and bend towards the inside of the adapter plate.

Optionally, the tab assembling portion includes a side assembling portion and a side recessed portion, the side assembling portion is located on a side of the adaptor piece extending along a width direction of the core assembly, and the side assembling portion is configured to allow a corresponding tab to pass through the side assembling portion and bend toward an inside of the adaptor piece; the side concave recess is located the adaptor piece is followed the side that the width direction of electricity core subassembly extended, side concave recess is followed the thickness direction of electricity core subassembly to the inside concave recess of adaptor piece, side concave recess is used for making corresponding utmost point ear from passing and to the inside of adaptor piece is buckled.

Optionally, two single-core tabs close to the innermost side of the electric core assembly penetrate through the tab assembly part on the adapter plate and then are bent towards the outer side of the electric core assembly; and the lugs of the other single battery cells penetrate through the lug assembling part on the adapter plate and then are bent towards the inner side of the battery cell assembly.

Optionally, the method further comprises: the insulating gasket, the top cover and the shell; the insulating gasket is positioned between the electrode core assembly and the adapter plate, and is provided with an electrode lug matching part for the electrode lug to pass through; the top cover is provided with a top cover pole column which is electrically connected with the switching sheet pole column; the electric core component is arranged in the shell.

Compared with the prior art, the utility model has the advantages of it is following:

on the first hand, the lug assembling part is arranged on the adapter plate, so that the lug upwards extends to penetrate through the lug assembling part, the lug is bent and is kneaded and pressed on the upper surface of the adapter plate and is electrically connected with the adapter plate, and then the lug enters the shell. Therefore, when the cell is assembled and connected, the adapter plate and the top cover are always positioned above the whole cell, and the pole lug is in an assembled state when the cell enters the shell, so that the pole lug is not required to be folded when the cell enters the shell. Therefore, the space for folding the tabs is not required to be reserved in the height direction, the space utilization rate in the height direction is improved, and the energy density of the secondary battery is further improved; the paths from the lugs to the switching piece are almost the same in the relaxation state, so that the short-circuit safety risk of the secondary battery caused by redundant lugs and sinking is reduced; after the lug is connected with the upper surface of the adapter plate, the adapter plate can support the lug, so that the risk of short circuit of the secondary battery caused by the insertion of the lug into the lug is reduced; meanwhile, the length of the pole ear can be reduced, and the internal resistance of the secondary battery is reduced.

In the second aspect, the first side of every single electric core body is close to the inboard setting of electric core assembly in the electric core assembly, the outside that the second side of every single electric core body is close to the electric core assembly sets up, utmost point ear stretches out from the position that the top surface is close to first side, make utmost point ear assembly portion on the switching piece that utmost point ear of two most inboard single electric cores corresponds also can be close to the inboard setting of electric core assembly, thereby the junction of the utmost point ear of the electric core that is close to the electric core assembly outside and switching piece can reduce the weak point of the water conservancy diversion that leads to because utmost point ear assembly portion between the switching piece utmost point post, reduce the utmost point ear of outside single electric core and the internal resistance between the connecting portion to the switching piece utmost point post that the switching piece formed, and then secondary battery's internal resistance has been reduced, very big promotion voltage platform and battery performance.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the principle of the application. In the drawings:

fig. 1 is a schematic view of a secondary battery according to an embodiment of the present invention;

FIG. 2 is a schematic view of the exploded structure of FIG. 1;

fig. 3 is a schematic structural diagram of a single cell;

FIG. 4 is a schematic structural view of the AA' section of FIG. 3;

FIG. 5 is a top view of 4 single core co-cores;

FIG. 6 is a schematic view of the structure of the BB' section of FIG. 5;

fig. 7 is a schematic structural view of a secondary battery according to an embodiment of the present invention after removing the cover;

FIG. 8 is an exploded view of FIG. 7;

fig. 9 is a schematic structural view of a battery tab after punching in an embodiment of the present invention;

FIG. 10 is a schematic structural view of section CC' of FIG. 9;

FIG. 11 is an enlarged schematic view of the upper portion of FIG. 10;

fig. 12 is a schematic structural view of a battery cell tab after being bent according to an embodiment of the present invention;

FIG. 13 is a schematic structural view of the DD' section of FIG. 12;

FIG. 14 is an enlarged schematic view of the upper portion of FIG. 13;

FIG. 15 is a schematic view of the structure of FIG. 12 after the top cover is attached;

FIG. 16 is a schematic structural view of section EE' of FIG. 15;

FIG. 17 is an enlarged schematic view of the upper portion of FIG. 16;

fig. 18 is a schematic structural view of a secondary battery according to another embodiment of the present invention after the cover is removed;

FIG. 19 is an exploded view of FIG. 18;

fig. 20 is a schematic structural view of the tab of fig. 18 prior to bending;

fig. 21 is a schematic structural view of the tab of fig. 18 after being bent;

fig. 22 is a schematic view showing a secondary battery according to another embodiment of the present invention after the cover is removed;

FIG. 23 is an exploded view of FIG. 22;

fig. 24 is a schematic structural view of the tab of fig. 22 before bending;

fig. 25 is a schematic view of the bent tab of fig. 22;

fig. 26 is a schematic structural view of a secondary battery according to another embodiment of the present invention after the cover is removed;

FIG. 27 is an exploded view of FIG. 26;

fig. 28 is a schematic structural view of the tab of fig. 26 prior to bending;

fig. 29 is a schematic view of a portion of the tab of fig. 26 after bending;

figure 30 is an assembly view of an electrical core assembly, insulating spacer and adaptor plate according to one embodiment of the present invention;

FIG. 31 is a schematic structural view of the FF' section of FIG. 30.

In the figure:

the secondary battery comprises a secondary battery 1, a top cover 11, poles 111 and 112, adapter plates 12 and 13, and adapter plate poles 121 and 131;

tab fitting portions 12a, 12b, 12c, 12d, 12e, 12f, 13a, 13b, 13c, 13d, 13e, 13f;

an insulating gasket 14, tab engaging portions 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h, 14i, 14j, 14k, and 14L;

electric core assembly 15, single electric cores 151, 152, 153, 154, 155, 156;

tabs 151a, 152a, 153a, 154a, 155a, 156a, 151b, 152b, 153b, 154b, 155b, 156b;

a housing 16;

connecting parts S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12;

openings 125, 126, 127, 135, 136, 137.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only examples or embodiments of the application, from which the application can also be applied to other similar scenarios without inventive effort for a person skilled in the art. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.

As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified steps or elements as not constituting an exclusive list and that the method or apparatus may comprise further steps or elements.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230," "upper surface," "above," and the like may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; below". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood, not simply by the actual terms used but by the meaning of each term lying within.

It should be noted that the term "plurality" in the present invention includes two or more.

It should be noted that, as illustrated in fig. 7, in the present invention: the width direction of electric core subassembly 15 is the X axle direction, and the thickness direction of electric core subassembly 15 is the Y axle direction, and the direction of height of electric core subassembly 15 is the Z axle direction, and the inboard that is close to electric core subassembly 15 is close to electric core subassembly 15 center on the Y axle promptly, and electric core subassembly 15 center is kept away from promptly on the Y axle to the outside of being close to electric core subassembly 15.

It should be noted that the same adapter plate in the present invention realizes the adapter of the tabs with the same polarity, and the tab assembly portion is used for the positive tab or the negative tab in the core assembly to pass through, so as to realize the electrical connection of the secondary battery; when the lug assembling part adopts the lug assembling hole and accommodates a lug of a single battery cell, the lug assembling hole is called a first lug assembling hole; when the lug assembling part adopts the lug assembling holes and accommodates lugs of a plurality of adjacent single battery cells, the lug assembling part is called a second lug matching hole; when the tabs of the adjacent single battery cells are accommodated, the polarities of the tabs are the same. The principle of the basic electricity is subject to the standard and will not be explained.

Similarly, the tab fitting portion of the insulating spacer is not described again.

In view of the problems of the prior art, the applicant has proposed a secondary battery, as shown in fig. 30 to 31, specifically as follows:

the battery pack comprises a battery pack 15 and adapter plates 12 and 13, wherein the battery pack 15 comprises 4 single batteries 151, 152, 153 and 154 which are sequentially arranged, each single battery comprises a single battery body and a tab, and the positions of the tabs extending out of the single battery bodies are not uniformly distributed in the thickness direction (Y-axis direction in the subsequent embodiment) of the battery pack 15; the upper surface of the adapter plate is provided with an adapter plate pole, the adapter plate is provided with a pole lug assembling part, and the pole lug assembling part is distributed on two sides of the adapter plate pole along the thickness direction of the electric core assembly 15; when the secondary battery is assembled, the tab of each single battery cell initially extends upwards, and each tab passes through the corresponding tab assembling portion and then bends towards the inner side of the battery cell assembly 15, and then is connected with the upper surface of the adapter sheet after bending (the tab is not shown in the figure, and the tab is bent and then is connected with the upper surface of the adapter sheet).

According to the assembly structure shown in fig. 30 to 31, when the secondary battery is assembled, the single battery cell and the tab may be vertically upward, as shown in fig. 30, so that the tab can better penetrate through the tab assembling portion of the interposer and then be bent, and then be welded.

By adopting the technical scheme, the pole lug on the top surface of the single electric core penetrates through the pole lug assembling part on the adapter plate, and then is kneaded and pressed on the upper surface of the adapter plate and is electrically connected with the adapter plate; the adapter plate and the top cover are always positioned above the whole electric core assembly during assembly and connection, and the electrode lugs are in an assembled state when the electric core assembly is inserted into the shell and are directly inserted into the shell; various problems caused by folding the pole lug during core combination in the background art are solved.

However, in the above-mentioned secondary battery assembling structure, since the positions of the tabs protruding from the single-cell bodies are not uniformly distributed between the single cells in the thickness direction of the cell assembly 15 (Y-axis direction in the subsequent embodiment), that is, the tabs of the two innermost single cells 152 and 153 close to the cell assembly are all close to the outside of the cell assembly, and the tab assembling portions are distributed on both sides of the tab post in the thickness direction of the cell assembly 15, there is a technical problem that the following further improvement and optimization is required: firstly, the size of the tab assembling parts corresponding to the tabs of the innermost two single electric cores 152 and 153 in the width direction of the electric core assembly is too long, so that a flow guiding weak point caused by the tab assembling parts exists between a connecting part formed by connecting the tabs of the single electric cores 151 and 154 close to the outer sides of the electric core assembly and an adapter sheet pole, particularly, the internal resistance between the connecting part formed by connecting the tabs of the single electric cores 151 and 154 on the outer sides and the adapter sheet pole is larger due to the flow guiding weak point caused by through holes, and further, the internal resistance of the secondary battery is increased, so that the voltage platform is reduced; secondly, the tabs of the single cells 151, 152, 153 and 154 are bent towards the inner side of the cell assembly 15 after passing through the tab assembling part, so that the internal resistances from the connecting part formed by connecting the tabs of the outer single cells 151 and 154 with the adapter sheet to the post of the adapter sheet and the internal resistances from the connecting part formed by connecting the tabs of the inner single cells 152 and 153 with the adapter sheet to the post of the adapter sheet are inconsistent, and further the voltage platform is reduced; thirdly, the matching mode of the pole lug and the pole lug assembling part of the adapter plate puts higher requirements on the production and assembly of the secondary battery.

Therefore, the applicant further provided an improved secondary battery based on the structure shown in fig. 30.

The secondary battery includes an electric core assembly and an interposer, as illustrated in fig. 1 to 26.

The single-cell module comprises a plurality of single cells which are sequentially arranged, each single cell comprises a single-cell body and a tab, each single-cell body is provided with a top surface and a first side surface and a second side surface which are oppositely arranged along the thickness direction of the single-cell module, the first side surface of each single-cell body is close to the inner side of the single-cell module, and the second side surface of each single-cell body is close to the outer side of the single-cell module; in the thickness direction of the electric core assembly, the tab extends out from the position of the top surface close to the first side surface.

The upper surface of the adapter plate is provided with an adapter plate pole, and the adapter plate is provided with a pole lug assembling part corresponding to the pole lug; and each tab penetrates through the tab assembling part and is connected with the upper surface of the adapter plate through bending.

It should be noted that, in the present application, "the adaptor sheet has the tab assembling portion corresponding to the tab" means that the tab corresponds to the tab assembling portion in position, so that the tab can pass through the corresponding tab assembling portion.

In some embodiments, the upper surface of the interposer is divided into a first region and a second region by a separation line extending in a thickness direction of the core assembly, and the interposer post is located in the first region; the tab assembling parts corresponding to the two single electric cores which are close to the innermost side of the electric core assembly are positioned in the second area; being close to that two single electric cores of electricity core subassembly innermost correspond utmost point ear assembly portion is followed the width direction of electricity core subassembly has first projection, switching piece utmost point post is followed the width direction of electricity core subassembly has the second projection, the second projection covers first projection.

In some embodiments, the tab assembling portion corresponding to each single cell of the cell assembly is located in the second area.

In some embodiments, the tab assembling portions corresponding to two single electric cores close to the outermost side of the electric core assembly are at least partially located in the first area, and the rest of the tab assembling portions are located in the second area.

In some embodiments, the tab fitting part includes a tab fitting hole; the tab assembling holes comprise a first tab assembling hole and/or a second tab assembling hole, the first tab assembling hole is used for enabling a tab on one single core in the tab assembling holes to pass through, the first tab assembling hole is provided with a third projection area along the height direction of the tab assembling holes, and the tab corresponding to the first tab assembling hole is positioned in the third projection area; the second pole lug assembling holes are used for enabling the pole lugs on the adjacent single electric cores in the electric core assembly to penetrate through, the second pole lug assembling holes are provided with a fourth projection area along the height direction of the electric core assembly, and the pole lugs are located in the fourth projection area.

In some embodiments, along the thickness direction of the cell assembly, the tabs of the two single cells close to the innermost side of the cell assembly correspond to one second tab assembling hole, so that the tabs of the two single cells close to the innermost side of the cell assembly pass through one second tab assembling hole.

In some embodiments, the secondary battery includes two of the adaptor pieces, each of the adaptor pieces having a first side and a second side extending in a thickness direction of the battery cell assembly, at least one of the adaptor pieces having the tab fitting hole with an opening at the first side; after the adapter plate and the electric core assembly are assembled, the first side edge of each adapter plate faces the first side edge of the other adapter plate.

In some embodiments, the tab assembling portion includes a tab assembling hole and a side recessed portion, the side recessed portion is located at a side of the adaptor sheet extending along a width direction of the electric core assembly, the side recessed portion is recessed toward an inside of the adaptor sheet along a thickness direction of the electric core assembly, and the side recessed portion is used for enabling a corresponding tab to pass therethrough and bend toward the inside of the adaptor sheet.

In some embodiments, the tab fitting part includes a tab fitting hole and a side fitting part; the side assembling part is positioned on the side edge of the adapter plate extending along the width direction of the electric core assembly, and the side assembling part is used for enabling the corresponding pole lug to penetrate through the side edge and bend towards the inside of the adapter plate.

In some embodiments, the tab fitting part includes a tab fitting hole, a side fitting part, and a side recess part at the same time.

In some embodiments, the tab fitting part includes both the side fitting part and the side recess part.

In some embodiments, the tabs of the two single cells close to the innermost side of the cell assembly penetrate through the tab assembling part on the adapter sheet and then are bent towards the outer side of the cell assembly; and the lugs of the other single cells penetrate through the lug assembling part on the adapter sheet and then are bent towards the inner side of the cell assembly.

In some embodiments, the secondary battery further comprises an insulating gasket located between the core assembly and the interposer, the insulating gasket having a tab fitting portion for passing the tab therethrough; when the secondary battery is assembled, the pole lug of each single battery cell extends upwards initially, and each pole lug is sequentially connected with the upper surface of the adapter sheet through bending from the pole lug matching part on the insulating gasket and the pole lug assembling part on the corresponding adapter sheet.

In some embodiments, the tab fitting part includes a first tab fitting hole and/or a second tab fitting hole, the first tab fitting hole is used for enabling a tab on one single core in the core assembly to pass through, the first tab fitting hole has a fifth projection area along the height direction of the core assembly, and the tab corresponding to the first tab fitting hole is located in the fifth projection area; the second pole ear matching hole is used for enabling the pole ears on a plurality of adjacent single electric cores in the electric core assembly to pass through, the second pole ear matching hole is along the height direction of the electric core assembly has a sixth projection area, and the pole ears are all located in the sixth projection area.

In some embodiments, utmost point ear cooperation portion includes utmost point ear mating holes and side recess, the side recess is located insulating gasket follows the side that the width direction of electric core subassembly extends, the side recess is followed the thickness direction of electric core subassembly to insulating gasket's inside recess, the side recess is used for making corresponding utmost point ear from passing.

In some embodiments, the tab mating part includes a tab mating hole and a side mating part; the side cooperation portion is located the side that insulating gasket follows the width direction of electricity core subassembly extends, side cooperation portion is used for making corresponding utmost point ear therefrom to pass.

In some embodiments, the tab fitting portion includes a tab fitting hole, a side fitting portion, and a side recessed portion at the same time.

In some embodiments, the tab fitting part includes both side fitting parts and side recessed parts.

According to the secondary battery obtained by adopting the technical scheme, the first side surface of each single-battery-cell body is arranged close to the inner side of the battery cell assembly, the second side surface of each single-battery-cell body is arranged close to the outer side of the battery cell assembly, the lug extends out from the position of the top surface close to the first side surface, and correspondingly, the pole of the adapter plate is positioned in the first area; close to two of electric core subassembly the utmost point ear assembly portion that single electric core corresponds is located the second is regional, and is close to two single electric cores of electric core subassembly are most inboard correspond utmost point ear assembly portion is followed the width direction of electric core subassembly has first projection, switching piece utmost point post is followed the width direction of electric core subassembly has the second projection, the second projection covers first projection to:

first, as shown in fig. 30 to 31, the tab assembly portion is provided on the adaptor plate, so that the tab extends upward to pass through the tab assembly portion, the tab is bent and pressed on the upper surface of the adaptor plate and electrically connected to the adaptor plate, and then the tab is inserted into the housing. Therefore, when the assembly connection is carried out, the adapter plate and the top cover are always positioned above the whole battery cell, and the pole lug is in an assembly state when the battery cell enters the shell, so that the pole lug does not need to be folded when the battery cell enters the shell. Therefore, the space for folding the tabs is not required to be reserved in the height direction, the space utilization rate in the height direction is improved, and the energy density of the secondary battery is further improved; the paths from the lugs to the switching piece are almost the same in the relaxation state, so that the short-circuit safety risk of the secondary battery caused by redundant lugs and sinking is reduced; after the lug is connected with the upper surface of the adapter plate, the adapter plate can support the lug, so that the risk of short circuit of the secondary battery caused by the insertion of the lug into the lug is reduced; meanwhile, the length of the pole ear can be reduced, and the internal resistance of the secondary battery is reduced.

And secondly, the size of the tab assembly parts corresponding to the tabs of the two innermost single cells along the width direction of the cell assembly cannot be overlong, so that the connection part formed by connecting the tabs of the cells outside the cell assembly and the adapter sheet is not provided with the weak point of diversion caused by the tab assembly parts between the adapter sheet poles, especially the weak point of diversion caused by through holes and the like, thereby reducing the internal resistance between the tabs of the cells outside and the internal resistance between the connection part formed by connecting the tabs and the adapter sheet poles, further reducing the internal resistance of the secondary battery, and greatly improving the voltage platform and the performance.

Thirdly, the lugs of the two single battery cells close to the innermost side of the battery cell assembly can be bent towards the outer side of the battery cell assembly after penetrating through the lug assembling parts on the adapter pieces, and the lugs of the other single battery cells can be bent towards the inner side of the battery cell assembly after penetrating through the lug assembling parts on the adapter pieces; therefore, the internal resistance between the connecting part formed by connecting the pole lug of the battery cell close to the outer side of the battery core assembly and the adapter sheet and the internal resistance between the connecting part of the pole lug of the battery cell close to the inner side of the battery core assembly and the adapter sheet tend to be consistent, and the long-term use performance of the secondary battery is improved.

Fourthly, will in this embodiment utmost point ear assembly portion all set up in the second is regional, can compromise the production of electric core to reduce the utmost point ear of the electric core in the outside and the internal resistance between the connecting portion that the switching piece is connected to form to the switching piece post, and then reduced secondary battery's internal resistance, very big promotion voltage platform and performance.

The technical solution of the present application will be further explained below with reference to specific examples.

Example one

Referring to fig. 1 to 17, a spatial coordinate system XYZ is shown, wherein the X axis is the width direction of the cell assembly 15, the Y axis is the thickness direction of the cell assembly 15, the Z axis is the height direction of the cell assembly 15, the inner side close to the cell assembly 15 is close to the center of the cell assembly 15 on the Y axis, and the outer side close to the cell assembly 15 is far from the center of the cell assembly 15 on the Y axis.

Fig. 1 is a schematic structural diagram of a secondary battery according to an embodiment of the present invention, and as shown in fig. 2 after the structure of the secondary battery 1 is disassembled, the secondary battery 1 includes a top cap 11, a housing 16, and a battery cell assembly 15 wrapped by the housing 16; the top cover 11 is provided with poles 111 and 112; adapter plates 12 and 13 and an insulating gasket 14 are arranged between the top cover 11 and the electric core assembly 15 from top to bottom in sequence in the Z-axis direction.

An interposer pole 121 is disposed on the upper surface of the interposer 12 (the upper surface of the interposer 12 in this application is the surface of the interposer 12 on the side away from the core assembly 15), and the interposer 12 has pole- tab assembling portions 12a, 12d and 12b; as shown in fig. 8, in this embodiment, the tab fitting portions 12a, 12d are each in the form of a side fitting portion, and the tab fitting portion 12b is in the form of a second tab fitting hole. The upper surface of the adaptor sheet 13 (the upper surface of the adaptor sheet 13 in this application is the surface of the adaptor sheet 13 on the side away from the core assembly 15) is provided with an adaptor sheet pole 131, and the adaptor sheet 13 has pole lug assembling parts 13a, 13d and 13b; as shown in fig. 8, in this embodiment, the tab fitting portions 13a, 13d are each in the form of a side fitting portion, and the tab fitting portion 13b is in the form of a second tab fitting hole.

The cell assembly 15 includes 4 single cells 151, 152, 153, 154 arranged in sequence. As shown in fig. 6, each single core includes a single core body and a tab, each single core body has a top surface Fd and a first side surface F1 and a second side surface F2 oppositely disposed along the thickness direction (Y axis direction) of the core assembly 15, the first side surface F1 of each single core body is disposed near the inner side of the core assembly 15, the second side surface F2 of each single core body is disposed near the outer side of the core assembly 15, and the tab protrudes from the top surface Fd near the first side surface F1 in the thickness direction of the core assembly 15. Illustratively, the body of the single cell 151 has a top surface Fd, and a first side surface F1 and a second side surface F2 are oppositely disposed along the thickness direction of the cell assembly 15, the first side surface F1 is disposed near the inner side of the cell assembly 15, the second side surface F2 is disposed near the outer side of the cell assembly 15, and the tab 151a extends from the top surface Fd near the first side surface F1. The rest single electric cores can be analogized, and the description is omitted.

The tabs 151a and 154a respectively penetrate (at this time, are wrapped around) the tab assembling portions 12a and 12d of the adaptor sheet 12 (both the tab assembling portions 12a and 12d are side assembling portions), the tabs 152a and 153a jointly penetrate one tab assembling portion 12b (the tab assembling portion 12b is in the form of a second tab assembling hole), the tabs 151b and 154b respectively penetrate (at this time, are wrapped around) the tab assembling portions 13a and 13d of the adaptor sheet 13 (both the tab assembling portions 13a and 13d are side assembling portions), and the tabs 152b and 153b jointly penetrate one tab assembling portion 13b (the tab assembling portion 13b is in the form of a second tab assembling hole). Then all the tabs penetrating through the tab assembling part on the adapter sheet are bent, as shown in fig. 14, the tabs 152a and 153a are bent towards the outer side of the core assembly, and the tabs 151a and 154a are bent towards the inner side of the core assembly; likewise, tabs 152b and 153b are each bent toward the outside of the core assembly and tabs 151b, 154b are each bent toward the inside of the core assembly. The parts of the bent tabs, which are contacted with the adapter sheet, are respectively connecting parts S1, S2, S3, S4, S5, S6, S7 and S8.

In some embodiments, the secondary battery 1 further includes an insulating gasket 14. As shown in fig. 8, the tabs 151a, 152a, 153a, 154a respectively pass through the tab fitting portions 14a, 14b, 14c, 14d of the insulating gasket 14 (in this embodiment, the tab fitting portions 14a, 14b, 14c, 14d are all in the form of first tab fitting holes), and then the tabs 151a, 154a respectively pass through (in this case, wrap around) the tab fitting portions 12a, 12d of the interposer 12 (the tab fitting portions 12a, 12d are all side fitting portions), and the tabs 152a and 153a jointly pass through one tab fitting portion 12b (the tab fitting portion 12b is in the form of second tab fitting holes). Similarly, the tabs 151b, 152b, 153b, 154b respectively pass through the tab engaging portions 14e, 14f, 14g, 14h of the insulating gasket 14 (in this embodiment, the tab engaging portions 14e, 14f, 14g, 14h are all in the form of first tab engaging holes), then the tabs 151b, 154b respectively pass through (in this case, wrap around) the tab assembling portions 13a, 13d of the adaptor sheet 13 (the tab assembling portions 13a, 13d are all side assembling portions), the tabs 152b and 153b jointly pass through one tab assembling portion 13b ((the tab assembling portion 13b is in the form of second tab assembling holes)), the insulating gasket 14 is placed between the adaptor sheet and the electric core assembly 15 to achieve insulation protection, and simultaneously, the function of positioning the adaptor sheet is provided to support the adaptor sheet and the tabs so that the tabs maintain good shapes, no redundancy, no sinking, and no short circuit risk.

It should be noted that the insulating gasket 14 may be made of an insulating material commonly used in the art, and may be manufactured by injection molding or die cutting, so as to achieve the insulating protection of the secondary battery and the supporting function of the contact piece.

In some embodiments, insulating spacer 14 has a thickness of between 0.1mm and 2mm, preferably between 0.1mm and 1 mm.

In some embodiments, the insulating spacer 14 may be in a single piece or in a split piece; the pole lug cooperation portion that supplies utmost point ear to pass is not restricted to the quantity and the complete one-to-one correspondence in position with utmost point ear in this embodiment, also can include as following various variant modes such as side cooperation portion and side concave recess of adaptor plate similar design principle, realizes that the deformation example that utmost point ear passed is all in the utility model discloses a within the scope, no longer give unnecessary details.

In some example embodiments, as shown in fig. 12, the upper surface of the interposer 12 is divided by a separation line G1 into a first region Q1 and a second region Q2, the interposer post 121 is located in the first region Q1, and the tab mounting portion 12b is located in the second region Q2. Likewise, the adaptor 13 is also configured as such, and will not be described herein.

Meanwhile, the second pole ear assembly holes corresponding to the two innermost single cells 152 and 153 close to the cell assembly 15 have a first projection W1 along the width direction of the cell assembly 15, the patch pole has a second projection W2 along the width direction of the cell assembly 15, and the second projection W2 covers the first projection W1.

Further, the tab fitting portions 12a, 12d are located in the second region Q2. Similarly, the adaptor piece 13 is also configured as such, and will not be described in detail herein.

In the secondary battery assembly provided by the embodiment, the first side surface of each single battery cell body is arranged close to the inner side of the battery cell assembly, the second side surface of each single battery cell body is arranged close to the outer side of the battery cell assembly, and the tabs extend out from the positions of the top surfaces close to the first side surfaces, so that tab assembling parts (namely tab assembling parts 12b and 13 b) which are close to the two innermost single battery cells and correspond to the two innermost single battery cells can be arranged close to the center of the battery cell assembly 15 on the Y axis, and correspondingly, the pole of the adapter sheet is positioned in the first area; be close to two of electric core subassembly the utmost point ear assembly portion that single electric core corresponds is located the second is regional, and is close to two single electric core of electric core subassembly most inboard correspond utmost point ear assembly portion is followed the width direction of electric core subassembly has first projection, switching piece utmost point post is followed the width direction of electric core subassembly has the second projection, the second projection covers first projection, first aspect for the utmost point ear assembly portion that the utmost point ear of two most inboard single electric cores corresponds can not the overlength along the ascending size of electric core subassembly width direction, thereby be close to the utmost point ear of the electric core outside is connected the connecting portion that forms with the switching piece and is not had the weak point of water conservancy diversion such as through-hole between the switching piece utmost point post to reduce the utmost point ear of the electric core in the outside and the internal resistance between the switching piece utmost point post of connecting portion that the switching piece is connected the formation, and then reduced secondary battery's internal resistance, very big promotion voltage platform and performance.

In the second aspect, the lugs of two single cells close to the innermost side of the cell assembly can be bent towards the outer side of the cell assembly after penetrating through the lug assembling parts on the adapter sheet, and the lugs of the other single cells can be bent towards the inner side of the cell assembly after penetrating through the lug assembling parts on the adapter sheet; therefore, the internal resistance between the connecting part formed by connecting the lug close to the battery cell outside the battery cell and the adapter sheet and the internal resistance between the connecting part close to the lug of the battery cell inside the battery cell and the adapter sheet and the internal resistance between the adapter sheet and the pole column tend to be consistent, and the long-term use performance of the secondary battery is improved.

In a third aspect, in this embodiment, the tab assembling portions are all disposed in the second area, which can take into account the production of the battery cell, and reduce the internal resistance between the tab of the battery cell outside and the connecting portion formed by connecting the tab with the adapter sheet to the pole of the adapter sheet, thereby reducing the internal resistance of the secondary battery, and greatly improving the voltage platform and performance.

Example two

Referring to fig. 18 to 21, the present invention provides another secondary battery 1, which includes a battery cell assembly 15 and an adaptor. The difference between this embodiment and the first embodiment is: the cell assembly 15 includes two cells 151, 152, and the tab mounting portion on the adaptor plate includes only a second tab mounting hole having an opening on the first side of the adaptor plate.

As shown in fig. 20, the electric core assembly 15 includes 2 single electric cores 151, 152 arranged in sequence, each single electric core includes a single electric core body and a tab, each single electric core body has a top surface Fd and a first side surface F1 and a second side surface F2 oppositely arranged along the thickness direction (Y-axis direction) of the electric core assembly 15, the first side surface F1 of each single electric core body is arranged near the inner side of the electric core assembly 15, the second side surface F2 of each single electric core body is arranged near the outer side of the electric core assembly 15, and the tab protrudes from the position where the top surface Fd is near the first side surface F1. Taking the single cell 151 as an example, the body of the single cell 151 has a top surface Fd, and a first side surface F1 and a second side surface F2 are oppositely disposed along the thickness direction of the cell assembly 15, the first side surface F1 is disposed near the inner side of the cell assembly 15, the second side surface F2 is disposed near the outer side of the cell assembly 15, and the tab 151a extends from the top surface Fd near the first side surface F1.

As illustrated in fig. 19, the interposer 12 has a first side L1 and a second side L2 extending in the thickness direction of the core assembly; the tab assembling portion 12a of the interposer 12 is a second tab assembling hole, and the first side L1 has an opening 125; after the adapter plates 12, 13 and the electrical core assembly are assembled, the first side L1 of the adapter plate 12 faces the first side L1 of the adapter plate 13.

During assembly, the tabs 151a and 152a jointly pass through a second tab assembly hole with an opening 125 on the adapter sheet 12, all the tabs are bent towards the outer side of the core assembly 15 and then connected with the upper surface of the adapter sheet, and the parts of the bent tabs, which are contacted with the adapter sheet, are respectively connecting parts S1 and S2. The second pole lug assembling hole with the opening can enable the pole lug to penetrate through the pole lug assembling hole of the adapter plate more easily.

Similarly, the tab assembly portion 13a on the adaptor plate 13 is also a second-pole tab assembly hole, and the first side L1 may also have an opening, the tabs 151b and 152b jointly pass through the second-pole tab assembly hole having an opening on the adaptor plate 13, all the tabs are bent toward the outer side of the core assembly 15 and then connected to the upper surface of the adaptor plate, and the portions of each tab that are bent and contacted with the adaptor plate are the connection portions S3 and S4, respectively. In this embodiment, any one of the second electrode tab mounting hole of the interposer 12 and the second electrode tab mounting hole of the interposer 13 has an opening, or both of them have openings at the same time, which is within the protection range thereof, and will not be described again.

The secondary battery also comprises an insulating gasket 14, and like the embodiment, when the secondary battery is assembled, the tabs of each battery cell initially extend upwards, and each tab is connected with the upper surface of the adapter sheet through bending after sequentially passing through the tab matching part on the insulating gasket and the tab assembling part on the corresponding adapter sheet.

Other technical features in this embodiment are the same as those of the secondary battery in the first embodiment, and are not described herein again.

EXAMPLE III

Referring to fig. 22 to 25, the present embodiment provides another secondary battery 1 including a battery cell assembly 15 and an interposer. The difference between this embodiment and the second embodiment is that: the cell assembly 15 comprises six cells 151, 152, 153, 154, 155 and 156, and the tab assembling part on the adapter plate comprises a first tab assembling hole, a second tab assembling hole and a side edge assembling part; the first sides L1 of the first tab assembling hole and the second tab assembling hole are both provided with openings.

The cell assembly 15 includes 6 single cells 151, 152, 153, 154, 155, 156 arranged in sequence, as shown in fig. 24, each single cell includes a single cell body and a tab, each single cell body has a top surface Fd and a first side surface F1 and a second side surface F2 oppositely arranged along a thickness direction (Y-axis direction) of the cell assembly 15, the first side surface F1 of each single cell body is arranged near the inner side of the cell assembly 15, the second side surface F2 of each single cell body is arranged near the outer side of the cell assembly 15, and the tab extends from a position where the top surface Fd is near the first side surface F1. Illustratively, the body of the single core 151 has a top surface Fd, and a first side surface F1 and a second side surface F2 are oppositely disposed along the thickness direction of the core assembly 15, the first side surface F1 is disposed near the inner side of the core assembly 15, the second side surface F2 is disposed near the outer side of the core assembly 15, and the tab 151a extends from the top surface Fd near the first side surface F1. The rest single electric cores can be analogized, and the description is omitted.

As shown in fig. 23, the adaptor plate 12 has a first side L1 and a second side L2 extending in the thickness direction of the core assembly, the tab assembling portions 2b, 12e and 12c on the adaptor plate 12 have openings 126, 127 and 125 on the first side L1, respectively, and the tab assembling portions 12a and 12f are side assembling portions, the tab assembling portions 12b and 12e are first tab assembling holes, and the tab assembling portion 12c is a second tab assembling hole. Similarly, the adaptor piece 13 is also configured as such, and will not be described in detail herein.

During assembly, the tabs 151a and 156a respectively pass through (in this case, wrap around) the tab assembly portions 12a and 12f of the interposer 12 (the tab assembly portions 12a and 12f are side assembly portions), the tab 152a and the tab 155a respectively pass through a first tab assembly hole having an opening 126 and a first tab assembly hole having an opening 127, and the tab 153a and the tab 154a together pass through a second tab assembly hole having an opening 125; similarly, the tabs 151b, 152b, 153b, 154b, 155b, 156b are also inserted through the tab assembling portions of the adaptor sheet 13, and will not be described in detail here. Then all the tabs penetrating through the tab assembling part on the adapter sheet are bent, as shown in fig. 25, the tabs 153a and 154a are bent towards the outer side of the core assembly, and the tabs 151a, 152a, 155a and 156a are bent towards the inner side of the core assembly; likewise, tabs 153b and 154b are each bent toward the outside of the core assembly, and tabs 151b, 152b, 155b and 156b are each bent toward the inside of the core assembly. And bending all the tabs and connecting the bent tabs with the upper surface of the adapter sheet, wherein the parts of the bent tabs, which are contacted with the adapter sheet, are connecting parts S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11 and S12 respectively.

The secondary battery comprises a plurality of secondary batteries, wherein each secondary battery comprises a plurality of cells, each cell comprises a lug, and each lug is connected with the upper surface of the corresponding adapter plate through bending from a lug matching part on the insulating gasket and a lug assembling part on the corresponding adapter plate.

Other technical features in this embodiment are the same as those of the secondary battery in the second embodiment, and are not described herein.

Example four

Referring to fig. 26 to 29, the present embodiment provides another secondary battery 1 including an electric core assembly 15, an interposer, and the difference between the third embodiment: the adapter plate comprises a side assembling part, a side concave part and a second pole lug assembling part; the same-polarity lugs on the single cells 151 and 156 are completely overlapped in projection along the thickness direction of the cell assembly, and the same-polarity lugs on the single cells 152, 153 and 154 are completely overlapped in projection along the thickness direction of the cell assembly; and the projections between the same-polarity tabs on the single cores 151 and 152 in the thickness direction of the electric core assembly are completely non-overlapping.

As shown in fig. 27, the relay tab 12 in this embodiment includes tab fitting parts 12a, 12b, 12c, 12e, 12f corresponding to the electric core assembly, wherein the tab fitting parts 12a, 12f are side fitting parts, the tab fitting parts 12b, 12e are side recessed parts, and the tab fitting part 12c is a second tab fitting hole having an opening 125 on a first side L1. Similarly, the adaptor piece 13 is also configured as such, and will not be described in detail herein. On one hand, the weight of the adapter sheet is further reduced and the material cost of the adapter sheet is saved by arranging the side concave part and/or the side assembling part; on the other hand, the pole lug is easier to assemble with the adapter plate.

During assembly, the tabs 151a and 156a respectively pass through (in this case, wrap around) the tab assembly portions 12a and 12f of the interposer 12 (the tab assembly portions 12a and 12f are side assembly portions), the tab 152a and the tab 155a respectively pass through (in this case, wrap around) the tab assembly portions 12b and 12e of the interposer 12 (the tab assembly portions 12b and 12e are side recessed portions), and the tab 153a and the tab 154a jointly pass through a second tab assembly hole having an opening 125; similarly, the tabs 151b, 152b, 153b, 154b, 155b, 156b are also inserted through the tab assembling portions of the adaptor sheet 13, and will not be described in detail here. Then all the tabs penetrating through the tab assembling part on the adapter sheet are bent, as shown in fig. 25, the tabs 153a and 154a are bent towards the outer side of the core assembly, and the tabs 151a, 152a, 155a and 156a are bent towards the inner side of the core assembly; likewise, tabs 153b and 154b are each bent toward the outside of the core assembly, and tabs 151b, 152b, 155b and 156b are each bent toward the inside of the core assembly. And bending all the tabs and connecting the bent tabs with the upper surface of the adapter sheet, wherein the parts of the bent tabs, which are contacted with the adapter sheet, are connecting parts S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11 and S12 respectively.

Further, in the present embodiment, the upper surface of the interposer is divided into a first area and a second area by a separation line extending along the thickness direction of the electric core assembly 15, and the interposer pole is located in the first area; except the lug assembling parts corresponding to the two single battery cells close to the outermost side of the battery cell assembly 15, the rest lug assembling parts are all positioned in the second area. Referring to fig. 26 and 27, a separation line G1 divides the interposer 12 into a first region Q1 and a second region Q2, the interposer post 121 is located in the first region Q1, and the tab fitting portions 12b and 12e and the tab fitting portion 12c having the opening 125 are located in the second region Q2; the tab fitting portions 12a, 12f are located in the first region Q1. Similarly, the adaptor piece 13 is also configured as such, and will not be described in detail herein.

The secondary battery comprises a plurality of secondary batteries, wherein each secondary battery comprises a plurality of battery cores, each battery core comprises a tab, and each tab is connected with the upper surface of the corresponding adapter plate through bending after sequentially passing through a tab matching part on the insulating gasket and a tab assembling part on the corresponding adapter plate.

Other technical features in this embodiment are the same as those of the secondary battery in the third embodiment, and are not described herein again.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, though not expressly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.

Also, the present application uses specific words to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Similarly, it should be noted that in the preceding description of embodiments of the present application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single disclosed embodiment.

Where numerals describing the number of components, attributes or the like are used in some embodiments, it is to be understood that such numerals used in the description of the embodiments are modified in some instances by the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.

Although the present application has been described with reference to the present specific embodiments, it will be recognized by those skilled in the art that the foregoing embodiments are merely illustrative of the present application and that various changes and substitutions of equivalents may be made without departing from the spirit of the application, and therefore, it is intended that all changes and modifications to the above-described embodiments that come within the spirit of the application fall within the scope of the claims of the application.

Claims (10)

1. A secondary battery, characterized by comprising:

the battery pack comprises a plurality of single batteries which are sequentially arranged, each single battery comprises a single battery body and a tab, each single battery body is provided with a top surface and a first side surface and a second side surface which are oppositely arranged along the thickness direction of the battery pack, the first side surface of each single battery body is close to the inner side of the battery pack, and the second side surface of each single battery body is close to the outer side of the battery pack; in the thickness direction of the electric core assembly, the lug extends out from the position of the top surface close to the first side surface;

the upper surface of the adapter plate is provided with an adapter plate pole, and the adapter plate is provided with a pole lug assembling part corresponding to the pole lug;

and each tab penetrates through the tab assembling part and is connected with the upper surface of the adapter plate through bending.

2. The secondary battery according to claim 1, wherein an upper surface of the interposer is divided into a first region and a second region by a separation line extending in a thickness direction of the cell assembly, the interposer post being located in the first region; the tab assembly parts corresponding to two single cores close to the innermost side of the core assembly are positioned in the second area;

being close to that two single electric cores of electricity core subassembly innermost correspond utmost point ear assembly portion is followed the width direction of electricity core subassembly has first projection, switching piece utmost point post is followed the width direction of electricity core subassembly has the second projection, the second projection covers first projection.

3. The secondary battery according to claim 2, wherein the tab assembling parts are all located at the second region, or at least part of the tab assembling parts corresponding to two single cells located at the outermost side of the electric core assembly are located at the first region, and the rest of the tab assembling parts are all located at the second region.

4. The secondary battery according to any one of claims 1 to 3, wherein the tab fitting part includes a tab fitting hole; the tab assembling holes comprise a first tab assembling hole and/or a second tab assembling hole, the first tab assembling hole is used for enabling a tab on one single core in the core assembly to pass through, the first tab assembling hole is provided with a third projection area along the height direction of the core assembly, and the tab corresponding to the first tab assembling hole is positioned in the third projection area; the second pole ear assembly holes are used for enabling the pole ears on a plurality of adjacent single cells in the cell core assembly to penetrate through, the second pole ear assembly holes are provided with a fourth projection area along the height direction of the cell core assembly, and the pole ears corresponding to the second pole ear assembly holes are all located in the fourth projection area.

5. The secondary battery of claim 4, wherein, in a thickness direction of the cell assembly, tabs of two of the single cells adjacent to the innermost side of the cell assembly correspond to one of the second pole tab assembling holes, so that tabs of two of the single cells adjacent to the innermost side of the cell assembly pass through one of the second pole tab assembling holes.

6. The secondary battery according to claim 4, wherein said secondary battery comprises two said adaptor pieces, each of said adaptor pieces having a first side and a second side extending in a thickness direction of said cell assembly, said tab fitting hole having an opening at said first side in at least one of said adaptor pieces; after the adapter plate and the electric core assembly are assembled, the first side edge of each adapter plate faces the first side edge of the other adapter plate.

7. The secondary battery according to claim 4, wherein the tab mounting part further comprises side recessed parts positioned at sides of the interposer extending in the width direction of the cell assembly and/or side mounting parts recessed toward the inside of the interposer in the thickness direction of the cell assembly, the side recessed parts being for the corresponding tab to pass therethrough and to be bent toward the inside of the interposer; the side assembly portion is located the adapter plate is along the side that the width direction of electricity core subassembly extends, side assembly portion is used for making corresponding utmost point ear pass and to the inside bending of adapter plate therefrom.

8. The secondary battery according to any one of claims 1 to 3, wherein the tab fitting parts include side fitting parts located at sides of the tab extending in the width direction of the core assembly and side recessed parts for allowing the corresponding tab to pass therethrough and to be bent toward the inside of the tab; the side concave-in portion is located the adaptor piece is followed the side that the width direction of electricity core subassembly extended, side concave-in portion is followed the thickness direction of electricity core subassembly to the inside concave yield of adaptor piece, side concave-in portion is used for making corresponding utmost point ear therefrom pass and to the inside of adaptor piece is buckled.

9. The secondary battery according to claim 1, wherein two of the single core tabs near the innermost side of the cell assembly are bent toward the outer side of the cell assembly after passing through the tab fitting part on the tab; and the lugs of the other single cells penetrate through the lug assembling part on the adapter sheet and then are bent towards the inner side of the cell assembly.

10. The secondary battery of claim 1, further comprising: the insulating gasket, the top cover and the shell; the insulating gasket is positioned between the electrode core assembly and the adapter plate, and is provided with an electrode lug matching part for the electrode lug to pass through; the top cover is provided with a top cover pole which is electrically connected with the switching sheet pole; the electric core component is arranged in the shell.

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