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

Abstract

The utility model relates to an assembly assembly for a secondary battery and the secondary battery. The assembly assembly includes a cell assembly and an adapter piece, the cell assembly includes at least one set of cell pairs, each group of cell pairs includes a first cell and a second cell adjacent to each other, the first The cell includes a first cell body and a first tab, the first tab protrudes from the first cell body, and the second cell includes a second cell body and a second tab, so The second tab protrudes from the second cell body, the first tab and the second tab correspond one by one, and one of the first tabs corresponds to one of the second tabs. The lugs are combined into one monopole lug; the adapter piece is used to electrically connect the monopole ear to the top cover pole of the secondary battery through the adapter piece. The use of the assembly component can reduce the short circuit risk of the secondary battery, simplify the assembly process and improve the production efficiency.

Description

Assemblies for secondary batteries and secondary batteries

technical field

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

Background technique

The battery has a positive pole and a negative pole, and the tab is a metal conductor that draws the positive and negative poles out of the battery cell. At present, the assembly structure inside the secondary battery usually includes a battery cell with tabs on the battery cell. There are two assembly methods. The first is to place the tabs under the battery top cover and directly connect them to the positive or negative poles on the top cover; It is arranged under the adapter sheet and connected with the adapter sheet, and the tab is connected with the positive pole or the negative pole on the top cover through the adapter sheet. According to these two assembly methods, after the tab is connected to the adapter piece and the pole, the tab is kept horizontal to the connecting piece or the top cover by bending the tab, and then the battery is put into the casing to complete the assembly of the secondary battery. assembly. However, the first structure has the following problems: without the support of the adapter piece, the tabs are easily inserted into the pole piece, which increases the risk of short circuit of the battery; this structure is more suitable for secondary batteries with small thickness. If this structure is used in a larger secondary battery, the length of the tab will be longer, and the problems of tab redundancy and sinking will be more serious. The problems of the second structure are: (1) the tab is located under the adapter piece, there is less space for folding the tab, the path and relaxation state of the tab to the adapter piece are different, and the tabs are redundant, sinking, etc. Problems, it will cause the short circuit risk of the secondary battery; (2) After assembly, the tabs are squeezed, and the tabs are easily damaged and broken when they are stressed, resulting in a decrease in the overcurrent capability.

How to reduce the risk of battery short circuit and avoid tab damage, redundancy, sinking and other problems without increasing the complexity of the process is an urgent problem to be solved at present.

Utility model content

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

The technical solution adopted by the present application to solve the above-mentioned technical problems is an assembly assembly for a secondary battery, including a cell assembly and an adapter piece, the cell assembly includes at least one set of cell pairs, and each set of The cell pair includes a first cell and a second cell that are adjacent to each other, the first cell includes a first cell body and a first tab, and the first tab protrudes from the first cell body, the second cell includes a second cell body and a second tab, the second tab protrudes from the second cell body, the first tab and the second tab In one-to-one correspondence, the corresponding one of the first tabs and one of the second tabs are merged into a single tab; The top cover poles of the secondary battery are electrically connected.

In an embodiment of the present application, the first battery cell has a first top surface and a first inner surface, the second battery core has a second top surface and a second inner surface, and the first inner surface and The second inner surface is in contact with each other, the first tab includes a first independent section and a first combined section, the second tab includes a second independent section and a second combined section, and a corresponding one of the first tabs A tab and a second tab are merged with each other through the first combining section and the second combining section respectively.

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

In an embodiment of the present application, the angle between the extension direction of the first independent segment and the first top surface ranges from 0 degrees to 90 degrees, and the extension direction of the second independent segment and the first top surface The included angle between the second top surfaces ranges from 0° to 90°.

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

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

In an embodiment of the present application, the manner of merging the corresponding one of the first tabs and the one of the second tabs into a single tab includes welding.

In an embodiment of the present application, the adapter sheet includes a lug fitting portion, and the lug fitting portion is used to allow at least one monopole lug to pass through, and the monopole lug passes through the lug fitting portion. After passing out, it is bent and electrically connected to the upper surface of the adapter sheet.

In an embodiment of the present application, the lug fitting portion includes a lug fitting hole and/or a side recess, the side recess is located on a side of the adapter piece, and the side The recessed portion is recessed toward the inside of the adapter sheet, and the side recessed portion is used to allow the corresponding monopole ear to pass therethrough and bend toward the inside of the adapter sheet.

In an embodiment of the present application, the lug mounting part further includes a side mounting part, the side mounting part is located on the side of the adapter piece, and the side mounting part is used to make the corresponding single The tab passes therethrough and bends toward the inside of the adapter piece.

In order to solve the above technical problems, the present application also proposes a secondary battery, which includes the assembly assembly as described above, and also includes a top cover and a casing, the top cover includes the top cover pole, and the monopole lug faces the The top cover is bent in the direction of the pole.

In the present application, the corresponding first tab and the second tab are combined into a single tab in the cell assembly of the secondary battery, and the single tab can be passed through the adapter plate in the process of forming the secondary battery. The assembly part of the adapter is bent afterward, which overcomes the problems in the prior art. At the same time, compared with the structure in which the first tab and the second tab are separately arranged, the number of tab assembly parts on the adapter sheet can be reduced, further simplifying the The assembly process is conducive to improving the production efficiency of the secondary battery.

Description of drawings

In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model will be described in detail below in conjunction with the accompanying drawings, wherein:

FIG. 1A is a schematic perspective view of the three-dimensional structure of the cell assembly in the assembled assembly of Embodiment 1 of the present application;

Fig. 1B is a sectional view of the embodiment shown in Fig. 1A along the vertical plane where the line AA' is;

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

Fig. 2B is a variation on the basis of the embodiment shown in Fig. 2A;

Fig. 3 is a schematic perspective view of the three-dimensional structure of the cell assembly in the assembly assembly of the second embodiment of the present application;

Figure 4A is an exemplary exploded view of an assembly assembly according to an embodiment of the present application;

Figure 4B is an exemplary exploded view of an assembly assembly according to another embodiment of the present application;

Fig. 5 is a schematic diagram of the structure corresponding to the exploded view shown in Fig. 4B after completion of assembly;

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

Fig. 6B is a partial cross-sectional view after the assembly assembly of the embodiment shown in Fig. 6A is assembled;

FIG. 6C is a schematic structural view of the monopole tab in the embodiment shown in FIG. 6A after being bent;

Fig. 7A is a structural schematic diagram after bending the monopole tab in the embodiment shown in Fig. 5;

Figure 7B is a cross-sectional view of the embodiment shown in Figure 7A along the vertical plane where the line CC' is located;

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

Fig. 8B is a product schematic diagram of the assembled secondary battery shown in Fig. 8A;

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

Fig. 8D is a cross-sectional view of the embodiment shown in Fig. 8B along the vertical plane where line BB' lies.

Detailed ways

In order to make the above-mentioned purposes, features and advantages of the present utility model more obvious and understandable, the specific implementation of the present utility model will be described in detail below in conjunction with the accompanying drawings.

In the following description, a lot of specific details have been set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways different from those described here, so the utility model is not limited by the specific embodiments disclosed below limit.

As indicated in this application and claims, the terms "a", "an", "an" and/or "the" do not refer to the singular and may include the plural unless the context clearly indicates an exception. Generally speaking, the terms "comprising" and "comprising" only suggest the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also contain other steps or elements.

In the description of the present application, it should be understood that orientation words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. indicate the orientation Or positional relationship is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description. In the absence of a contrary statement, these orientation words do not indicate or imply the device or element referred to It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the protection scope of the present application; the orientation words "inner and outer" refer to the inner and outer relative to the outline of each component itself.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. To limit the protection scope of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant according to his or her judgment, and their detailed meanings are listed in this article described in the relevant section of the description. Furthermore, it is required that this application be understood not only by the actual terms used, but also by the meaning implied by each term.

Hereinafter, embodiments of the present invention will be described based on the drawings. However, the embodiments shown below are illustrations of an assembly assembly for a secondary battery and a secondary battery for embodying the technical idea of the present invention, and the assembly assembly for a secondary battery and the secondary battery of the present invention are The secondary battery is not specified as the following. Furthermore, in this specification, numbers corresponding to members shown in the embodiments are assigned to members shown in the columns of “claims” and “contents of utility model” in order to facilitate understanding of the scope of the claims. However, the components shown in the claims are by no means specified as components of the embodiment. In particular, the dimensions, materials, shapes, and relative arrangements of the constituent members described in the embodiments are not intended to limit the scope of the present invention, but are merely illustrative examples, unless otherwise specified. .

However, dimensions, positional relationships, and the like of members shown in the drawings may be exaggerated for clarity. Furthermore, in the following description, the same names and symbols refer to the same or homogeneous members, and detailed description thereof is appropriately omitted. Furthermore, each element constituting the present invention may be configured in a form in which a plurality of elements are constituted by the same member, and one member may also serve as a plurality of elements, or conversely, a function of one member may be shared by a plurality of members. In addition, the contents described in some examples and embodiments can also be used in other examples, embodiments, and the like. In addition, in the present specification, "upper" is not limited to the case where it is formed in contact with the upper surface, but also includes the case where it is formed separately above, and it is also used in the meaning that there is an intervening layer between layers.

The secondary batteries involved in this application include but are not limited to secondary lithium-ion batteries, nickel-metal hydride batteries, nickel-chromium batteries, lead-acid batteries, polymer lithium-ion batteries, and the like.

FIG. 1A is a schematic perspective view of a cell assembly in an assembly assembly according to Embodiment 1 of the present application. Fig. 1B is a sectional view of the embodiment shown in Fig. 1A along the vertical plane where the line AA' is located (the vertical plane is parallel to the YZ plane). 1A and 1B, the cell assembly of this embodiment includes at least one cell pair 101, the cell pair 101 includes a first cell 110 and a second cell 120 adjacent to each other, the first cell 110 includes The first cell body 111 and the first tab, the first tab protrudes from the first cell body 111, the second cell 120 includes the second cell body 121 and the second tab, the second tab protrudes In the second cell body 121 , the first tab and the second tab are in one-to-one correspondence, and a corresponding first tab and a second tab are merged into a single tab.

As shown in FIG. 1A , both the first cell body 111 and the second cell body 121 are roughly rectangular blocks with a certain thickness, and both have the same shape and size. FIG. 1A is not used to limit the specific shape and size of the first cell body 111 and the second cell body 121 . FIG. 1A shows the coordinate system XYZ of the three-dimensional space. Taking the first cell body 111 as an example, it is assumed that the Y direction is the thickness direction of the first cell body 111, and the X direction is the thickness direction of the first cell body 111. The width direction, 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 cell body 111 and the second cell body 121 are adjacent to each other along their thickness direction, so the thickness of the cell assembly is equal to the sum of the thicknesses of the first cell body 111 and the second cell body 121 .

In the cell assembly of the present application, the one-to-one correspondence between the first tab and the second tab means that the number of the first tab is the same as the number of the second tab, and one first tab corresponds to one second tab; And, the position of the first tab and the position of the second tab also correspond to each other, so that the corresponding first tab and the second tab can be combined into a single tab.

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

As shown in FIG. 1A , the first tab 112 a has a certain width along the X direction, and the second tab 122 a also has a certain width along the X direction, and the two widths are equal. Further, as shown in FIG. 1A and FIG. 1B , the first cell body 111 has a first top surface 141 and a first inner side 142 , and the second cell body 121 has a second top surface 151 and a second inner side 152 , The first inner side 142 and the second inner side 152 abut against each other. The first tab 112a is located on the first top surface 141 and in an area close to the first inner side 142, and the second tab 122a is located on the second top surface 151 and in an area close to the second inner side 152, so the two are merged. When it gets up, the first pole tab 112a and the second pole tab 122a are completely attached to form a single pole tab 130a. Similarly, the first tab 112b and the second tab 122b also have the same width, so that the first tab 112b and the second tab 122b are combined to form a single tab 130b similar to the single tab 130a.

What is shown in FIG. 1A is only an example. In other embodiments, taking the first tab 112a and the second tab 122a as an example, the width and position of the two may not be exactly the same, as long as the first tab 112a and the second tab 112a The tabs 122a have overlapping areas, for example, the positions along the X direction are partially staggered, and the two can still be connected by combining, 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 the same as The first polarity is reversed. For example, the first polarity is positive, and the second polarity is negative.

The present application does not limit the connection manner of the first battery cell 110 and the second battery cell 120 . In some embodiments, the first battery cell 110 and the second battery cell 120 can be attached to each other through the first inner surface 142 and the second inner surface 152 to be firmly connected together. In some other embodiments, the first cell 110 and the second cell 120 may be bound together by a strap to achieve the purpose of fixing.

Referring to FIG. 1B again, in this embodiment, the first tab 112a is located on the first top surface 141 close to the first inner side 142, and the second tab 122a is located on the second top surface 151 close to the second inner side. 152 places. According to these embodiments, since the positions of the first tab 112a and the second tab 122a in the Y direction are close to each other, it is more favorable to combine them.

FIG. 1B is not used to limit the specific positions of the first tab 112a and the second tab 122a. In other embodiments, for example, in the Y direction, the first tab 112a may be located in the middle of the first top surface 141 , and the second tab 122a may be located in the middle of the second top surface 151 .

FIG. 2A is an enlarged schematic view of area F in FIG. 1B . The region F mainly includes a single tab 130a formed by merging the first tab 112a and the second tab 122a. As shown in FIG. 2A, the first tab 112a includes a first independent section 211 and a first combined section 212, and the second tab 122a includes a second independent section 221 and a second combined section 222, corresponding to a first tab 112a and a second tab 122a are combined with each other through the first combining section 212 and the second combining section 222 respectively. As shown in FIG. 2A, in this embodiment, the first independent segment 211 is bent toward the direction of the second inner side 152, and the second independent segment 221 is bent toward the direction of the first inner side 142, so that the combined unit The tab 130 a is basically located directly above the first inner surface 142 and the second inner surface 152 , that is, between the first battery cell 110 and the second battery cell 120 . Viewed from the entire cell pair 101 , the monopole ear 130 a is basically located in the middle of the cell pair 101 along the thickness direction Y of the cell pair 101 .

In some embodiments, the angle between the extending direction of the first independent segment 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 segment 221 and the second top surface 151 The included angle ranges from 0° to 90°. Ideally, the first independent segment 211 is completely attached to the first top surface 141 to minimize the height of the cell assembly in the Z direction, thereby saving space. However, since the tab has a certain thickness, there is an included angle between the first independent segment 211 and the first top surface 141 , and the included angle is generally less than 30 degrees, such as less than 5 degrees.

In the embodiment shown in FIG. 2A , the length of the first merged segment 212 is equal to the length of the second merged segment 222 . Since the first inner surface 142 and the second inner surface 152 are actually adjacent to each other, they are collectively referred to as the interface between the first battery cell 110 and the second battery cell 120 . In the single tab 130a shown in FIG. 2A , the first tab 112a and the second tab 122a are symmetrical to each other with the interface as the axis of symmetry.

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

Fig. 2B is a modification example on the basis of the embodiment shown in Fig. 2A. As shown in FIG. 2B , in this embodiment, when the first tab 112 a and the second tab 122 a are merged, only one of them is bent toward the other. For example, the second tab 122a is bent toward the first inner surface 142, so that the combined monopole tab 130a is actually located above the first top surface 141, or vice versa. In these embodiments, in order to better electrically connect the first tab and the second tab, the second length of the second tab 122a should be longer than the first length of the first tab 112a. As shown in FIG. 2B , in some embodiments, the length of the first combined segment 212 is equal to the length of the second combined segment 222 , therefore, the length of the first independent segment 211 is smaller than the length of the second independent segment 221 .

In the embodiment shown in FIG. 2A and the embodiment shown in FIG. 2B , the position of the monopole tab 130a is different, so when forming a secondary battery, the position of the monopole tab 130a on other components and related assembly parts should also be Make appropriate adjustments.

FIG. 3 is a schematic perspective view of a cell assembly in an assembly assembly according to Embodiment 2 of the present application. As shown in Figure 3, the cell assembly of this embodiment includes two 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 The core 330 and the second electric core 340. Similar to Embodiment 1, a first tab and a second tab corresponding to each other in each cell pair 301, 302 are merged into a single tab to form a single tab 311a, 311b, 331a, 331b. In the embodiment shown in FIG. 3 , the relative positions of the monopole tabs 311a, 311b in the cell pair 301 are the same as the relative positions of the monopole tabs 331a, 331b in the cell pair 302, and the monopole tabs 311a, 311b , 331a, 331b have the same width along the X direction.

In other embodiments, the relative positions and widths of the monopole lugs in different groups 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 of merging a corresponding first tab and a second tab into a single tab includes welding. Welding methods may include ultrasonic welding, thermocompression welding, laser welding, etc., and this application does not limit the specific welding methods. The shapes and structures of the monopole tabs formed by different welding methods may be different, but in any case, all the tabs in the monopole tab are gathered and integrated.

FIG. 4A is an exemplary exploded view of an assembly assembly according to an embodiment of the present application. As shown in FIG. 4A , the assembly assembly includes an adapter plate 420 and a cell assembly 410 . Wherein, the cell assembly 410 is the cell assembly mentioned above, for example, the cell assembly including two sets of cell pairs 301 and 302 shown in FIG. 3 . The preceding figures and descriptions can be used to illustrate the cell assembly 410 in FIG. 4A .

As shown in FIG. 4A , the battery cell assembly 410 has four monopole lugs 411 a , 411 b , 412 a , 412 b , and correspondingly, the adapter piece 420 has four lug assembly parts 421 a , 421 b , 422 a , 422 b. Each tab assembly part is used to allow at least one monopole tab to pass through during the assembly process of the secondary battery. In this embodiment, the tab assembly part and the monopole tab have a one-to-one correspondence. For example, the monopole tabs 411a, 411b, 412a, and 412b correspond to the tab mounting portions 421a, 421b, 422a, and 422b, respectively. In other embodiments, the tab mounting portion is adapted to allow a plurality of monopole tabs to protrude therethrough.

It should be noted that the adapter piece 420 actually includes two pieces, namely the first adapter piece 420a and the second adapter piece 420b. The first adapter piece 420a further includes a first adapter pole post 423a, and the second adapter piece 420b further includes a second adapter pole post 423b.

In the embodiment shown in FIG. 4A , an insulating part may be provided on the lower surface of the adapter sheet 420 , so that when the adapter sheet 420 is assembled on the top surface of the cell assembly 410 , the lower surface of the adapter sheet 420 and the top surface of the cell assembly 410 are insulated from each other.

FIG. 4B is an exemplary exploded view of an assembly assembly according to another embodiment of the present application. As shown in Figure 4B, in these embodiments, the secondary battery further includes an insulating gasket 450, which is used to provide insulation and protection between the adapter sheet 420 and the cell assembly 410, and at the same time facilitates the connection of the adapter sheet. Positioning and support also play a role in supporting the tabs, so that the tabs maintain a good shape without redundancy or sinking.

As shown in Figure 4B, there are four gasket assembly parts 451a, 451b, 452a, 452b on the insulating gasket 450, corresponding to the tab assembly parts 421a, 421b, 422a, 422b on the adapter piece, and the corresponding gasket The fitting part and the lug fitting part cooperate with each other for allowing the monopole lugs 411a, 411b, 412a, 412b to pass therethrough.

FIG. 5 is a schematic diagram of the structure corresponding to the exploded view shown in FIG. 4B after completion of assembly. As shown in FIG. 5 , each monopole tab 411 a , 411 b , 412 a , 412 b respectively passes through its corresponding gasket assembly hole and tab assembly hole and protrudes along the Z direction.

In the embodiment shown in FIGS. 4A-5 , the lug fitting portion on the adapter piece 420 is a tab fitting hole. In some embodiments, the tab mounting portion on the adapter sheet includes a side mounting portion and a tab mounting hole, the side mounting portion is located on a side of the adapter sheet, and the side mounting portion is used to allow the corresponding monopole tab to Feed through and bend towards the inside of the adapter.

Fig. 6A is an exemplary exploded view of an assembly assembly according to another embodiment of the present application, Fig. 6B is a partial cross-sectional view of the assembly assembly of the embodiment shown in Fig. 6A after assembly, and Fig. 6C is a monopole lug in the embodiment shown in Fig. 6A Schematic diagram of the structure after bending. As shown in FIG. 6A , the lug mounting portion on the adapter piece 620 in this embodiment is a side recess. For example, the first adapter piece 620a includes side recesses 621a, 622a, and the second adapter piece 620b includes side recesses 621b, 622b. At the same time, the insulating gasket 650 has four gasket fitting parts 651a, 651b, 652a, 652b, corresponding to the lug fitting parts 621a, 621b, 622a, 622b on the adapter piece respectively. FIG. 6B is a cross-sectional view along the vertical plane where the AA' line in FIG. 6C is located (the vertical plane is a plane parallel to the YZ plane). 6A and 6B, after the monopole tabs 611a and 612a pass through the gasket assembly parts 651a and 652a on the insulating gasket 650, respectively, and then pass through the side recesses 621a and 622a respectively, in combination with FIG. When the tabs are used, the single tabs 611a, 612a wrap around the side recesses 621a, 622a and bend inwards respectively.

It should be noted that the side recess is located on the side of the adapter sheet, and the side recess is recessed into the interior of the adapter sheet, and the side recess is used to allow the corresponding monopole ear to pass through and turn to The inner bend of the tab.

In some embodiments, the tab mounting portion of the adapter sheet simultaneously includes a tab mounting hole, a side mounting portion and a side recess. In some embodiments, the lug mounting part of the adapter piece includes a side mounting part and at least one side recessed part at the same time, and the two together form a stepped side, which is suitable for a cell assembly including a plurality of cells. Matching, for example, 8 or more batteries.

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

In order to further illustrate the assembly process of the secondary battery, the following uses FIG. 7A to FIG. 7B to illustrate.

FIG. 7A is a structural schematic view after bending the monopole tab in the embodiment shown in FIG. 5 . As shown in FIG. 7A , the monopole ear 411a is flatly laid on the connection portion 710a of the adapter piece 420 by kneading and pressing, and the monopole ear 411a is welded to the adapter piece 420 at the connection portion 710a by welding or the like. . Similarly, monopole tabs 411b, 412a, 412b are welded to connection portions 710b, 720a, 720b, respectively.

FIG. 7B is a cross-sectional view of the embodiment shown in FIG. 7A along the vertical plane where the line CC' is located (the vertical plane is a plane parallel to the YZ plane). As shown in FIG. 7B, the monopole ears 412a, 411a after kneading, pressing and bending are all attached to the upper surface of the adapter piece 420, and the monopole ears 412a, 411a are both electrically conductive with the first adapter piece pole 423a. connect.

FIG. 8A is a schematic diagram 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 further includes a top cover 430 and a casing 440 in addition to the cell assembly 410 and the adapter sheet 420 . The top cover 430 includes top cover poles 431 , 432 corresponding to the first adapter pole 423 a and the second adapter pole 423 b respectively. During assembly, the first adapter pole 423a and the second adapter pole 423b are electrically connected to the top cover poles 431 and 432 by means of welding or the like.

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

FIG. 8B is a schematic diagram of the assembled secondary battery shown in FIG. 8A . As shown in FIG. 8B , the top cover 430 and the casing 440 cooperate with each other, so that the adapter piece 420 , the insulating gasket 450 and the cell assembly 410 are located in the accommodation space formed by the top cover 430 and the casing 440 .

Figure 8C is a front view of the embodiment shown in Figure 8B, as shown in Figure 8C, the entire housing 440 only has two protruding poles on its top cover 430, which are the top cover pole 431 and the top cover pole Column 432.

FIG. 8D is a cross-sectional view of the embodiment shown in FIG. 8B along the vertical plane where BB' is located (the vertical plane is a plane parallel to the YZ plane). As shown in FIG. 8D, the monopole tabs 412a, 411a are bent after passing through the assembly holes on the insulating spacer 450 and the adapter piece 420 respectively, so that the monopole ears 412a, 411a are parallel to the adapter piece 420. After the top cover 430 , the adapter piece 420 is connected to the positive pole 431 , so that both the monopole tabs 412 a and 411 a are conductively connected to the positive pole 431 .

As shown in Figure 8D, in this embodiment, the monopole ears are all bent towards the direction of the top cover pole 431, so that each monopole ear and the top cover pole 431 have a shorter distance, which is beneficial to reduce the weight of the secondary battery. internal resistance.

In the secondary battery of the present application, the height space between the top cover and the battery cell is compressed by passing the single tab after the first tab and the second tab are combined through the assembly hole on the adapter sheet 420 and then bending. , the height of the battery cell is increased, the energy density of the secondary battery is further improved, and at the same time, compared with the structure in which the first tab and the second tab in the battery cell are separately arranged, the number of assembly holes of the adapter sheet can be reduced , which further simplifies the assembly process and is conducive to improving the production efficiency of the secondary battery.

While the foregoing disclosure discusses some presently believed to be useful embodiments of the invention by way of various examples, it should be understood that such details are for illustrative purposes only and that the appended claims are not limited to the disclosed embodiments, to the contrary, The claims are intended to cover all modifications and equivalent combinations that conform to the spirit and scope of the embodiments of the present invention. For example, although the system components described above may be implemented by hardware devices, they may also be implemented by a software-only solution, such as installing the described system on an existing server or mobile device.

In the same way, it should be noted that in order to simplify the expression of the disclosure of the utility model and help the understanding of one or more utility model embodiments, in the foregoing description of the utility model embodiments, various features are sometimes combined into one Examples, drawings or descriptions thereof. This method of disclosure does not, however, imply that the inventive subject matter requires more features than are recited in the claims. Indeed, embodiment features are less than all features of a single foregoing disclosed embodiment.

In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of the embodiments use the modifiers "about", "approximately" or "substantially" in some examples. grooming. Unless otherwise stated, "about", "approximately" or "substantially" indicates that the stated figure allows for a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that can vary depending upon the desired characteristics of individual embodiments. In some embodiments, numerical parameters should take into account the specified significant digits and adopt the general digit reservation method. Although the numerical ranges and parameters used to confirm the breadth of the scope of some embodiments of the present invention are approximations, in specific embodiments, such numerical values are set as precisely as practicable.

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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