CN218939953U - Assembly component for secondary battery and secondary battery - Google Patents

Abstract

The present utility model relates to a mounting assembly for a secondary battery and a secondary battery. The assembly component comprises a battery cell component and a switching piece, wherein the battery cell component comprises at least one group of battery cell pairs, each group of battery cell pairs comprises a first battery cell and a second battery cell which are mutually adjacent, the first battery cell comprises a first battery cell body and a first tab, the first tab protrudes from the first battery cell body, the second battery cell comprises a second battery cell body and a second tab, the second tab protrudes from the second battery cell body, the first tab corresponds to the second tab one by one, and the corresponding first tab and second tab are combined into a single-pole tab; the transfer piece is used for enabling the monopole lug to be in conductive connection with the top cover pole of the secondary battery through the transfer piece. The assembly component can reduce the risk of short circuit of the secondary battery, simplify the assembly process and improve the production efficiency.

Description

Assembly component for secondary battery and secondary battery

Technical Field

The present utility model relates to the technical field of secondary batteries, and in particular, to a mounting assembly for a secondary battery and a secondary battery.

Background

The battery is provided with a positive electrode and a negative electrode, and the electrode lugs are metal conductors for leading out the positive electrode and the negative electrode from the battery core. Currently, an internal assembly structure of a secondary battery generally includes a battery cell having a tab thereon. The assembly method comprises two steps, wherein the first step is that the tab is arranged below the top cover of the battery and is directly connected with the positive pole or the negative pole on the top cover; the second is to add a switching piece in the assembly component, and the tab is arranged below the switching piece and connected with the switching piece, and is connected with the positive pole or the negative pole on the top cover through the switching piece. According to the two assembly methods, after the tab is connected with the switching sheet and the tab post, the tab is bent to keep the tab horizontal with the connecting sheet or the top cover, and then the battery core is arranged in the shell to complete the assembly of the secondary battery. However, the first structure has the following problems: the electrode lug is easy to insert into the electrode plate without the support of the switching sheet, so that the short circuit risk of the battery is increased; such a structure is suitable for a secondary battery having a small thickness, and if the structure is used in a secondary battery having a large thickness, the length of the tab is long, and problems such as tab redundancy and sagging are more serious. The second structure has the problems that: (1) The tab is positioned below the switching piece, the space for folding the tab is small, the path from the tab to the switching piece and the loose state are different, the tab has the problems of redundancy, sinking and the like, and the short circuit risk of the secondary battery can be caused; (2) After assembly, the tab is extruded, and when the tab is stressed, the tab is easy to break, so that the overcurrent capacity is reduced.

How to reduce the short-circuit risk of the battery, avoid the problems of tab breakage, redundancy, sinking and the like, and at the same time, not increase the complexity of the process is a problem to be solved urgently.

Disclosure of Invention

The technical problem to be solved by the application is to provide an assembly component and a secondary battery, which can reduce the risk of short circuit of the secondary battery, simplify the assembly process and improve the production efficiency.

The technical scheme adopted by the application for solving the technical problems is that the assembly component for the secondary battery comprises a battery core component and a switching piece, wherein the battery core component comprises at least one group of battery core pairs, each group of battery core pairs comprises a first battery core and a second battery core which are mutually adjacent, the first battery core comprises a first battery core body and a first tab, the first tab protrudes from the first battery core body, the second battery core comprises a second battery core body and a second tab, the second tab protrudes from the second battery core body, the first tab and the second tab are in one-to-one correspondence, and the corresponding first tab and the second tab are combined into a single-pole tab; the transfer piece is used for enabling the monopole lug to be in conductive connection with the top cover pole of the secondary battery through the transfer piece.

In an embodiment of the present application, the first battery cell has a first top surface and a first inner side surface, the second battery cell has a second top surface and a second inner side surface, the first inner side surface and the second inner side surface are in butt joint, the first tab includes a first independent section and a first merging section, the second tab includes a second independent section and a second merging section, and a corresponding one of the first tab and the second tab is respectively merged with each other through the first merging section and the second merging section.

In an embodiment of the present application, the first independent section is bent towards the direction of the second inner side surface, and the second independent section is bent towards the direction of the first inner side surface.

In an embodiment of the present application, an included angle between the extending direction of the first independent section and the first top surface ranges from 0 degrees to 90 degrees, and an included angle between the extending direction of the second independent section and the second top surface ranges from 0 degrees to 90 degrees.

In an embodiment of the present application, the length of the first merging section is equal to the length of the second merging section.

In an embodiment of the present application, the length of the first tab protruding from the first battery core body is a first length, the length of the second tab protruding from the second battery core body is a second length, and the first length is equal to the second length.

In an embodiment of the present application, the corresponding manner in which the first tab and the second tab are combined with each other into one monopole tab includes welding.

In an embodiment of the present application, the tab assembly portion is configured to enable at least one monopole tab to pass therethrough, and the monopole tab is bent to be electrically connected to the upper surface of the tab after passing through the tab assembly portion.

In an embodiment of the present application, the tab assembly portion includes a tab assembly hole and/or a side recess, the side recess is located at a side of the adapter piece, the side recess is recessed toward an inside of the adapter piece, and the side recess is used for allowing a corresponding monopole tab to pass therethrough and bend toward the inside of the adapter piece.

In an embodiment of the present application, the tab assembly further includes a side assembly portion, the side assembly portion is located at a side of the adapter piece, and the side assembly portion is used for enabling the corresponding monopole tab to pass through and bend toward an inside of the adapter piece.

The utility model provides a solve above-mentioned technical problem and still provide a secondary cell, including the assembly component as described above, still include top cap and casing, the top cap includes the top cap utmost point post, monopole ear orientation top cap utmost point post direction is buckled.

According to the battery cell assembly, the corresponding first tab and second tab are combined into the single tab, the single tab can be bent after passing through the assembly part on the switching piece in the process of forming the secondary battery, the problem in the prior art is solved, and meanwhile, compared with the structure that the first tab and the second tab are arranged separately, the number of tab assembly parts on the switching piece can be reduced, the assembly process is further simplified, and the production efficiency of the secondary battery is improved.

Drawings

In order to make the above objects, features and advantages of the present utility model more comprehensible, embodiments accompanied with figures are described in detail below, wherein:

fig. 1A is a schematic perspective view of a battery cell assembly in a mounting assembly according to a first embodiment of the present application;

FIG. 1B is a cross-sectional view of the embodiment of FIG. 1A taken along the vertical plane of line AA';

FIG. 2A is an enlarged schematic view of region F in FIG. 1B;

FIG. 2B is a variation of the embodiment of FIG. 2A;

fig. 3 is a schematic perspective view of a battery cell assembly in a mounting assembly according to a second embodiment of the present application;

FIG. 4A is an exemplary exploded view of a fitting assembly according to an embodiment of the present application;

FIG. 4B is an exemplary exploded view of a fitting assembly according to another embodiment of the present application;

FIG. 5 is a schematic view of the structure after assembly corresponding to the exploded view of FIG. 4B;

FIG. 6A is an exemplary exploded view of a fitting assembly according to another embodiment of the present application;

FIG. 6B is a partial cross-sectional view of the mounting assembly of the embodiment of FIG. 6A;

FIG. 6C is a schematic view of the embodiment of FIG. 6A after bending the monopole ear;

FIG. 7A is a schematic view of the embodiment of FIG. 5 after bending the monopole ear;

FIG. 7B is a cross-sectional view of the embodiment of FIG. 7A taken along the vertical plane of line CC';

fig. 8A is a schematic view of an exploded structure of a secondary battery according to an embodiment of the present application;

fig. 8B is a schematic view of a product of the secondary battery shown in fig. 8A after being assembled;

FIG. 8C is a front view of the embodiment shown in FIG. 8B;

fig. 8D is a cross-sectional view of the embodiment of fig. 8B taken along the vertical plane along line BB'.

Detailed Description

In order to make the above objects, features and advantages of the present utility model more comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways than as described herein, and therefore the present utility model is not limited to the specific embodiments disclosed below.

As used in this application and in the claims, the terms "a," "an," "the," and/or "the" are not specific to the singular, but may include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.

In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some 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. Furthermore, it is required that the present application be understood, not simply by the actual terms used but by the meaning of each term lying within.

Hereinafter, embodiments of the present utility model will be described based on the drawings. However, the embodiments shown below are examples of a mounting assembly for a secondary battery and a secondary battery for embodying the technical idea of the present utility model, and the mounting assembly for a secondary battery and the secondary battery of the present utility model are not particularly limited to the following. Further, in order to facilitate understanding of the scope of the claims, the numbers corresponding to the elements shown in the examples are given to the elements shown in the columns of "claims" and "summary of the utility model". However, the elements shown in the claims are by no means intended to be specific as elements of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present utility model to those described herein unless specifically stated, but are merely illustrative examples.

However, the dimensions, positional relationships, and the like of the members shown in the drawings may be exaggerated for clarity. In the following description, the same names and symbols denote the same or similar members, and detailed description thereof is omitted. Further, each element constituting the present utility model may be a plurality of elements formed by the same member, and one member may also serve as a plurality of elements, or conversely, the functions of one member may be shared by a plurality of members. The contents described in some of the examples and embodiments may be applied to other examples and embodiments. In the present specification, "upper" is used not only in the case of being in contact with the upper surface but also in the case of being formed above in a spaced-apart manner, and also in the meaning of including a layer and a layer having an intervening layer therebetween.

Secondary batteries contemplated by the present application include, but are not limited to, secondary lithium ion batteries, nickel hydrogen batteries, nickel chromium batteries, lead acid batteries, polymeric lithium ion batteries, and the like.

Fig. 1A is a schematic perspective view of a battery cell assembly in a mounting assembly according to a first embodiment of the present application. Fig. 1B is a cross-sectional view of the embodiment of fig. 1A taken along the vertical plane along line AA' (the vertical plane being parallel to the YZ plane). Referring to fig. 1A and fig. 1B, the battery cell assembly of this embodiment includes at least one group of battery cell pairs 101, where the battery cell pairs 101 include a first battery cell 110 and a second battery cell 120 that are adjacent to each other, the first battery cell 110 includes a first battery cell body 111 and a first tab, the first tab protrudes from the first battery cell body 111, the second battery cell 120 includes a second battery cell body 121 and a second tab protruding from the second battery cell body 121, the first tab and the second tab are in one-to-one correspondence, and the corresponding first tab and second tab are combined into a single-pole tab.

As shown in fig. 1A, the first cell body 111 and the second cell body 121 are both substantially rectangular blocks having a certain thickness, and both have the same shape and size. Fig. 1A is not intended to limit the specific shape and size of the first and second cell bodies 111 and 121. Fig. 1A shows a coordinate system XYZ of the three-dimensional space, taking the first cell body 111 as an example, assuming that the Y direction is the thickness direction of the first cell body 111, the X direction is the width direction of the first cell body 111, and the Z direction is the height direction of the first cell body 111. The thickness of the first cell body 111 is significantly smaller than its width and height. The first and second cell bodies 111 and 121 are adjacent to each other in the thickness direction thereof, so that the thickness of the cell assembly is equal to the sum of the thicknesses of the first and second cell bodies 111 and 121.

In the battery cell assembly, the first tabs and the second tabs are in one-to-one correspondence, wherein the number of the first tabs is the same as that of the second tabs, and one first tab corresponds to one second tab; and the positions of the first tab and the second tab are also corresponding to each other, so that the corresponding first tab and second tab can be combined into one monopole tab.

In the embodiment shown in fig. 1A and 1B, the cell assembly includes only one set of cell pairs 101, the first cell 110 includes first tabs 112a, 112B, and the second cell 120 includes second tabs 122a, 122B. The positions of the first tabs 112a and 112b on the first cell body 111 and the positions of the second tabs 122a and 122b on the second cell body 121 are corresponding to each other. The first tab 112a and the second tab 122a are combined into a monopolar tab 130a, and the first tab 112b and the second tab 122b are combined into a monopolar tab 130b.

As shown in fig. 1A, the first tab 112a has a certain width along the X direction, and the second tab 122a also has a certain width along the X direction, and the widths of the two are equal. Further, as shown in fig. 1A and 1B, the first cell body 111 has a first top surface 141 and a first inner side surface 142, the second cell body 121 has a second top surface 151 and a second inner side surface 152, and the first inner side surface 142 and the second inner side surface 152 abut against each other. The first tab 112a is located on the first top surface 141 and in a region near the first inner side surface 142, and the second tab 122a is located on the second top surface 151 and in a region near the second inner side surface 152, so that when the two tabs are combined, the first tab 112a and the second tab 122a are just fully attached to form the monopole tab 130a. Likewise, the first tab 112b and the second tab 122b also have the same width such that the first tab 112b and the second tab 122b combine to form a monopolar tab 130b similar to the monopolar tab 130a.

In other embodiments, taking the first tab 112a and the second tab 122a as examples, the widths and positions of the two may not be identical, so long as the first tab 112a and the second tab 122a have overlapping regions, for example, the positions along the X direction are partially staggered, and the two tabs may still be turned on by merging, which also means that the first tab 112a and the second tab 122a have corresponding positions.

As shown in fig. 1A, the first tab 112a and the second tab 122a have the same first polarity; the first tab 112b and the second tab 122b have the same second polarity, and the second polarity is opposite to the first polarity. For example, the first polarity is positive and the second polarity is negative.

The connection manner of the first battery cell 110 and the second battery cell 120 is not limited in this application. In some embodiments, the first and second cells 110, 120 may be adhered to each other by the first and second inner sides 142, 152 to be firmly connected together. In other embodiments, the first and second cells 110, 120 may be tied together by a strap for fixation purposes.

Referring again to fig. 1B, in this embodiment, the first tab 112a is located on the first top surface 141 proximate to the first inner side surface 142, and the second tab 122a is located on the second top surface 151 proximate to the second inner side surface 152. According to these embodiments, since the first tab 112a and the second tab 122a are positioned close to each other in the Y direction, the combination of both is more advantageous.

Fig. 1B is not intended to limit the specific locations of the first tab 112a and the second tab 122 a. In other embodiments, the first tab 112a may be positioned at a middle position of the first top surface 141 and the second tab 122a may be positioned at a middle position of the second top surface 151, for example, in the Y direction.

Fig. 2A is an enlarged schematic view of the region F in fig. 1B. The region F mainly includes a monopolar tab 130a formed by combining the first tab 112a and the second tab 122 a. As shown in fig. 2A, the first tab 112A includes a first independent section 211 and a first merging section 212, and the second tab 122A includes a second independent section 221 and a second merging section 222, and a corresponding one of the first tab 112A and one of the second tab 122A are merged with each other through the first merging section 212 and the second merging section 222, respectively. In this embodiment, as shown in fig. 2A, the first independent section 211 is bent toward the second inner side 152, and the second independent section 221 is bent toward the first inner side 142, so that the combined monopolar lug 130a is located substantially directly above the first inner side 142 and the second inner side 152, that is, at a position between the first cell 110 and the second cell 120. From the entire cell pair 101, the monopolar ear 130a is located substantially in the middle of the cell pair 101 in the thickness direction Y of the cell pair 101.

In some embodiments, the angle between the extending direction of the first independent section 211 and the first top surface 141 ranges from 0 degrees to 90 degrees, and the angle between the extending direction of the second independent section 221 and the second top surface 151 ranges from 0 degrees to 90 degrees. Ideally, the first independent section 211 is completely attached to the first top surface 141, so as to reduce the height of the cell assembly in the Z direction as much as possible, thereby saving space. However, since the tab has a certain thickness, the first independent section 211 and the first top surface 141 have an included angle therebetween, and the included angle is generally less than 30 degrees, for example, less than 5 degrees, etc.

In the embodiment shown in fig. 2A, the length of the first merge segment 212 is equal to the length of the second merge segment 222. Since the first and second inner sides 142, 152 are actually adjacent to each other, they are also collectively referred to as the interface of the first and second cells 110, 120. In the monopole tab 130a shown in fig. 2A, the first tab 112A and the second tab 122A are symmetrical with each other with the interface as a symmetry axis.

In some embodiments, the length of the first tab protruding from the first cell body 111 is a first length, the length of the second tab protruding from the second cell body 121 is a second length, and the first length is equal to the second length. According to these embodiments, the length of the first merging section 212 is equal to the length of the second merging section 222, while the length of the first independent section 211 is equal to the length of the second independent section 221.

Fig. 2B is a variation of the embodiment shown in fig. 2A. As shown in fig. 2B, in this embodiment, when the first tab 112a and the second tab 122a are combined, only one of them is bent toward the other. For example, the second tab 122a is bent toward the first inner side 142 such that the combined monopole tab 130a is substantially above the first top surface 141, or vice versa. In these embodiments, the second length of the second tab 122a should be longer than the first length of the first tab 112a in order to provide a better conductive connection between the first tab and the second tab. As shown in fig. 2B, in some embodiments, the length of the first merge section 212 is equal to the length of the second merge section 222, and thus, the length of the first independent section 211 is less than the length of the second independent section 221.

In the embodiment shown in fig. 2A and the embodiment shown in fig. 2B, the positions of the monopolar ears 130a are different, and therefore, the positions of the associated fitting parts of the monopolar ears 130a on other elements should also be appropriately adjusted when forming the secondary battery.

Fig. 3 is a schematic perspective view of a battery cell assembly in a mounting assembly according to a second embodiment of the present application. As shown in fig. 3, the cell assembly of this embodiment includes 2 sets of cell pairs 301, 302, wherein the cell pair 301 includes a first cell 310 and a second cell 320, and the cell pair 302 includes a first cell 330 and a second cell 340. Similar to the embodiment, one first tab and one second tab corresponding to each other in each set of cell pairs 301, 302 are combined into one monopolar tab, forming the monopolar tabs 311a, 311b, 331a, 331b as shown in fig. 3. In the embodiment shown in fig. 3, the relative positions of the monopolar ears 311a, 311b in the cell pair 301 are the same as the relative positions of the monopolar ears 331a, 331b in the cell pair 302, and the widths of the monopolar ears 311a, 311b, 331a, 331b in the X-direction are the same.

In other embodiments, the relative positions, widths, of the monopolar ears in different sets of cell pairs may be different.

In some embodiments, the cell assembly of the present application includes 3 or more cell pairs.

In some embodiments, in the cell assembly of the present application, the manner in which the corresponding one of the first tab and the one of the second tab are combined with each other into one of the monopolar tabs includes welding. The welding mode may include ultrasonic welding, hot press welding, laser welding, etc., and the present application does not limit a specific welding mode. The shape and structure of the monopole ears formed by different welding modes can be different, and all the pole ears in the monopole ears are folded and integrated.

Fig. 4A is an exemplary exploded view of a fitting assembly according to an embodiment of the present application. As shown in fig. 4A, the assembly includes a switch tab 420 and a cell assembly 410. The cell assembly 410 is a cell assembly described above, for example, a cell assembly including 2 sets of cell pairs 301 and 302 as shown in fig. 3. The foregoing figures and description may be used to illustrate the cell assembly 410 of fig. 4A.

As shown in fig. 4A, the cell assembly 410 has four monopolar tabs 411a, 411b, 412a, 412b, and correspondingly, the switching tab 420 has 4 tab mounts 421a, 421b, 422a, 422b. Each tab fitting portion serves to pass at least one single-pole tab therethrough during the fitting process of the secondary battery, and in this embodiment, the tab fitting portions have a one-to-one correspondence with the single-pole tabs. For example, the monopolar tabs 411a, 411b, 412a, 412b correspond to the tab mounting portions 421a, 421b, 422a, 422b, respectively. In other embodiments, the tab assembly is adapted to have a plurality of monopolar tabs extending therethrough.

The switching piece 420 actually includes 2 pieces, i.e., a first switching piece 420a and a second switching piece 420b. The first tab 420a further includes a first tab post 423a, and the second tab 420b further includes a second tab post 423b.

In the embodiment shown in fig. 4A, an insulating portion may be provided on the lower surface of the switch plate 420 such that the lower surface of the switch plate 420 and the top surface of the cell assembly 410 are insulated from each other when the switch plate 420 is assembled on the top surface of the cell assembly 410.

Fig. 4B is an exemplary exploded view of a fitting assembly according to another embodiment of the present application. As shown in fig. 4B, in these embodiments, the secondary battery further includes an insulating spacer 450 for insulating and protecting between the adaptor tab 420 and the cell assembly 410, and also for positioning and supporting the adaptor tab, and for supporting the tab, so that the tab maintains a good shape without redundancy, sinking, and the like.

As shown in fig. 4B, the insulating spacer 450 has 4 spacer mounting portions 451a, 451B, 452a, 452B thereon, corresponding to tab mounting portions 421a, 421B, 422a, 422B on the tab, respectively, and the corresponding spacer mounting portions and tab mounting portions cooperate with each other for passing the monopolar tabs 411a, 411B, 412a, 412B therethrough.

Fig. 5 is a schematic view of the structure after the assembly is completed corresponding to the exploded view shown in fig. 4B. As shown in fig. 5, each of the monopolar tabs 411a, 411b, 412a, 412b passes through its corresponding spacer mounting hole and tab mounting hole, respectively, and protrudes in the Z direction.

In the embodiment shown in fig. 4A to 5, the tab fitting portion on the adapter piece 420 is a tab fitting hole. In some embodiments, the tab fitting portion on the tab includes a side fitting portion and a tab fitting hole, the side fitting portion being located at a side of the tab, the side fitting portion being for passing a corresponding monopole tab therethrough and bending toward an inside of the tab.

Fig. 6A is an exemplary exploded view of a fitting assembly according to another embodiment of the present application, fig. 6B is a partial cross-sectional view of the fitting assembly of the embodiment of fig. 6A after assembly, and fig. 6C is a schematic view of the structure of the embodiment of fig. 6A after bending of the monopole ear. As shown in fig. 6A, the tab fitting portion on the switching piece 620 in this embodiment is a side recessed portion. For example, the first tab 620a includes side recesses 621a, 622a thereon, and the second tab 620b includes side recesses 621b, 622b thereon. Meanwhile, the insulating spacer 650 has 4 spacer fitting portions 651a, 651b, 652a, 652b thereon, corresponding to tab fitting portions 621a, 621b, 622a, 622b on the tab, respectively. Fig. 6B is a cross-sectional view taken along the vertical plane (the vertical plane being a plane parallel to the YZ plane) along line AA' in fig. 6C. Referring to fig. 6A and 6B, after the monopole ears 611a and 612a pass through the pad fitting portions 651a and 652a on the insulating pad 650, respectively, the monopole ears pass through the side recessed portions 621a and 622a, respectively, and when the tab ears are folded, the monopole ears 611a and 612a wrap around the side recessed portions 621a and 622a and are folded inward, respectively.

The side edge concave part is positioned at the side edge of the switching piece, and the side edge concave part is concave towards the inside of the switching piece, and the side edge concave part is used for enabling the corresponding monopole lug to pass through and bend towards the inside of the switching piece.

In some embodiments, the tab mounting portion of the tab includes both a tab mounting hole, a side mounting portion and a side recess. In some embodiments, the tab-mounting portion of the tab includes both a side-mounting portion and at least one side recess, which together form a stepped side, adapted to mate with a cell assembly including a plurality of cells, such as 8 or more cells.

In some embodiments, the tab mounting portion of the tab includes both a tab mounting hole and a side recess.

To further explain the assembly process of the secondary battery, the following description will be made with reference to fig. 7A to 7B.

Fig. 7A is a schematic diagram of the structure after bending the monopole ear according to the embodiment shown in fig. 5. As shown in fig. 7A, the monopole ear 411a is laid flat on the connection portion 710a of the adapter piece 420 by kneading or the like, and the monopole ear 411a and the adapter piece 420 are welded to each other by welding or the like at the connection portion 710 a. Similarly, monopolar ears 411b, 412a, 412b are welded to connections 710b, 720a, 720b, respectively.

Fig. 7B is a cross-sectional view of the embodiment of fig. 7A taken along the vertical plane (the vertical plane being a plane parallel to the YZ plane) taken along line CC'. As shown in fig. 7B, the monopole ears 412a and 411a after being kneaded and bent are attached to the upper surface of the adapter piece 420, and the monopole ears 412a and 411a are electrically connected to the first adapter piece post 423 a.

Fig. 8A is a schematic view of an exploded structure of a secondary battery according to an embodiment of the present application. As shown in fig. 8A, the secondary battery in this embodiment includes a top cover 430 and a case 440 in addition to the battery cell assembly 410 and the switch tab 420. The top cover 430 includes top cover posts 431 and 432 corresponding to the first and second switching piece posts 423a and 423b, respectively. During assembly, the first and second tab posts 423a, 423b are electrically connected to the cap posts 431, 432, respectively, by welding or the like.

As shown in fig. 8A, in some embodiments, the secondary battery may further include an insulating spacer 450.

Fig. 8B is a schematic view of a product after the secondary battery shown in fig. 8A is assembled. As shown in fig. 8B, the top cover 430 cooperates with the housing 440 such that the adaptor tab 420, the insulating spacer 450 and the cell assembly 410 are all positioned in the receiving space formed by the top cover 430 and the housing 440.

Fig. 8C is a front view of the embodiment of fig. 8B, as shown in fig. 8C, the entire housing 440 has only 2 protruding poles on its top cover 430, top cover pole 431 and top cover pole 432, respectively.

Fig. 8D is a cross-sectional view of the embodiment of fig. 8B taken along the vertical plane in which BB' (the vertical plane being a plane parallel to the YZ plane) is located. As shown in fig. 8D, the monopole tabs 412a and 411a are bent after passing through the mounting holes of the insulating spacer 450 and the adaptor tab 420, respectively, so that the monopole tabs 412a and 411a are parallel to the adaptor tab 420, and after the top cover 430 is assembled, the adaptor tab 420 is connected to the positive electrode post 431, so that the monopole tabs 412a and 411a are electrically connected to the positive electrode post 431.

As shown in fig. 8D, in this embodiment, the monopolar ears are bent toward the top cap pole 431, so that each of the monopolar ears and the top cap pole 431 have a short distance, which is advantageous for reducing the internal resistance of the secondary battery.

The secondary battery of this application is through buckling after passing the mounting hole on the change piece 420 with the monopole ear after first utmost point ear and the second ear are merged, has compressed the altitude space between top cap and the electric core, has promoted the height of electric core, has further promoted the energy density of secondary battery, compares with the structure that first utmost point ear and the second ear set up separately in the electric core simultaneously, can reduce the quantity of the mounting hole of change piece, has further simplified assembly process, is favorable to improving the production efficiency of secondary battery.

While certain presently useful inventive embodiments have been discussed in the foregoing disclosure, by way of example, it is to be understood that such details are merely illustrative and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements included within the spirit and scope of the embodiments of the utility model. For example, while the system components described above may be implemented by hardware devices, they may also be implemented solely by software solutions, such as installing the described system on an existing server or mobile device.

Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are required by the subject utility model. Indeed, less than all of the features of a single embodiment disclosed above.

In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Claims (11)

1. The assembly component for the secondary battery is characterized by comprising a battery core component and a switching piece, wherein the battery core component comprises at least one group of battery core pairs, each group of battery core pairs comprises a first battery core and a second battery core which are mutually adjacent, the first battery core comprises a first battery core body and a first tab, the first tab protrudes from the first battery core body, the second battery core comprises a second battery core body and a second tab, the second tab protrudes from the second battery core body, the first tab and the second tab are in one-to-one correspondence, and the corresponding first tab and second tab are combined into a single tab; the transfer piece is used for enabling the monopole lug to be in conductive connection with the top cover pole of the secondary battery through the transfer piece.

2. The mounting assembly of claim 1 wherein the first cell has a first top surface and a first inner side surface, the second cell has a second top surface and a second inner side surface, the first inner side surface and the second inner side surface are in abutment, the first tab includes a first independent section and a first merging section, the second tab includes a second independent section and a second merging section, and a corresponding one of the first tab and the second tab merge with each other through the first merging section and the second merging section, respectively.

3. The fitting assembly of claim 2 wherein said first individual segment is folded in a direction toward said second interior side and said second individual segment is folded in a direction toward said first interior side.

4. A fitting assembly according to claim 3, wherein the angle between the direction of extension of said first individual section and said first top surface ranges from 0 degrees to 90 degrees and the angle between the direction of extension of said second individual section and said second top surface ranges from 0 degrees to 90 degrees.

5. The fitting assembly of claim 2 wherein the length of the first merge segment is equal to the length of the second merge segment.

6. The assembly of claim 5, wherein the first tab protrudes from the first cell body by a first length and the second tab protrudes from the second cell body by a second length, the first length being equal to the second length.

7. The mounting assembly of claim 1 wherein the manner in which a corresponding one of said first tab and said second tab are joined to one another as a single tab includes welding.

8. The mounting assembly of claim 1, wherein the tab includes a tab mounting portion thereon for passing at least one monopole tab therethrough, the monopole tab being conductively connected to the upper surface of the tab by bending after passing from the tab mounting portion.

9. The assembly of claim 8, wherein the tab assembly portion includes a tab assembly hole and/or a side recess located at a side of the tab, the side recess being recessed toward an inside of the tab, the side recess being for a corresponding monopolar tab to pass therethrough and bend toward the inside of the tab.

10. The assembly of claim 9, wherein the tab mounting portion further comprises a side mounting portion located at a side of the tab for allowing a corresponding monopolar tab to pass therethrough and bend inwardly of the tab.

11. A secondary battery comprising the assembly according to any one of claims 1 to 10, further comprising a top cover and a case, the top cover including the top cover post, the single-pole tab being bent toward the top cover post.

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