CN218274683U

CN218274683U - Single battery and battery pack

Info

Publication number: CN218274683U
Application number: CN202221423805.3U
Authority: CN
Inventors: 杨伟; 戴亨伟; 陈辉; 张耀
Original assignee: Sunwoda Huizhou Power New Energy Co Ltd
Current assignee: Sunwoda Huizhou Power New Energy Co Ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2023-01-10
Anticipated expiration: 2032-06-08
Also published as: WO2023236533A1

Abstract

The application discloses a single battery and a battery pack, wherein the single battery comprises a battery shell, a battery core, an end cover, a conductive piece and a switching piece, the battery shell is provided with an opening, the battery core is positioned in the battery shell, and the battery core comprises a battery core main body and a lug connected with the battery core main body; the end cover covers and seals the opening of the battery shell, and the end cover is provided with a through channel; the adapter is positioned between the end cover and the pole lug and is abutted against the corresponding pole lug; the conductive piece is positioned in the channel and is electrically connected with the adapter piece and the end cover respectively. Because the passageway link up first end cover setting, consequently can be from the outside of first end cover connection first end cover and adaptor, its operating space is bigger, can reduce the assembly degree of difficulty, and electrically conductive piece is mainly or all to be located the passageway, can reduce or avoid occupying battery case inner space to can increase the height of electric core, and then increase the energy density of battery.

Description

Single battery and battery pack

Technical Field

The application relates to the technical field of energy storage devices, in particular to a single battery and a battery pack.

Background

Among the correlation technique, full utmost point ear cylinder battery includes electric core, battery case, end cover and switching piece, and battery case's diapire riveting has the terminal, and the terminal has the through-hole, sets up the welding post on the switching piece, during the assembly, needs pass the through-hole of terminal with the welding post, then carries out welded fastening, and above-mentioned structure is more complicated, and need weld from battery case's inside, is unfavorable for the assembly.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a single battery, can connect first end cover and adaptor from the outside of first end cover to can reduce the assembly degree of difficulty.

The application provides a battery pack using the single battery.

According to the battery cell in the first embodiment of the present application, including:

a battery case having an opening;

the battery cell is positioned in the battery shell and comprises a battery cell main body and a lug connected with the battery cell main body;

an end cap covering the opening of the battery case, the end cap having a through passage;

the adapter is positioned between the end cover and the lug, and is attached to the corresponding lug;

the single battery further comprises a conductive piece, the conductive piece is located in the channel, and the conductive piece is electrically connected with the adapter piece and the end cover respectively.

According to the battery module of this application embodiment, have following beneficial effect at least:

because the passageway link up first end cover and sets up, consequently can be from the outside of first end cover connection first end cover and adaptor, its operating space is bigger, can reduce the assembly degree of difficulty. On the other hand, the conductive piece connected between the first end cover and the adapter piece is mainly or completely positioned in the channel, so that the occupation of the internal space of the battery shell can be reduced or avoided, the height of the battery cell can be increased, and the energy density of the battery can be increased.

In other embodiments of the present application, the outer side of the end cap has a first groove, and the channel is located at a bottom of the first groove.

In other embodiments of the present application, the end cap includes a first substrate and a first connecting portion, the first connecting portion is recessed toward the adaptor with respect to the first substrate to form the first groove, and the first connecting portion is attached to the adaptor.

In other embodiments of the present application, the unit cell further includes a sealing member connected to an outer side of the end cap and covering the conductive member.

In other embodiments of the present application, the adaptor includes a second substrate and a second connecting portion, the second connecting portion is opposite to the second substrate and extends out toward the end cover, the second connecting portion is attached to the end cover and electrically connected to the conductive member, and the second substrate is abutted to the tab.

In other embodiments of the present application, the adaptor further includes a third connecting portion, the third connecting portion extends out toward the end cap relative to the second substrate, and along a radial direction of the adaptor, the second connecting portion and the third connecting portion are located on two opposite sides of the second substrate, and the third connecting portion is attached to the end cap.

In other embodiments of the present application, a protruding portion extends from one side of the adaptor facing the end cap, the protruding portion is located in the channel, and the conductive member is electrically connected to the protruding portion and the end cap, respectively.

In other embodiments of the present application, the conductive member is welded to the adaptor and the end cap, respectively.

In other embodiments of the present application, the channel comprises a continuous weld seam disposed along a circumference of the end cap;

or the channel comprises a plurality of welding seams which are sequentially arranged along the circumferential direction of the end cover;

or, the channel includes a plurality of welding holes, and is a plurality of the welding hole is followed the circumference of end cover sets gradually.

According to the battery pack in the second embodiment of the present application, comprising:

a box body;

the single battery is positioned in the box body.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic perspective view of a single battery in one direction in the embodiment of the present application;

fig. 2 is a schematic perspective view of the unit cell of fig. 1 in another direction;

FIG. 3 is an exploded view of the cell of FIG. 1;

fig. 4 isbase:Sub>A sectional view in the direction ofbase:Sub>A-base:Sub>A of the unit cell of fig. 1;

FIG. 5 is an exploded view of the area B in FIG. 4;

fig. 6 is an exploded view of a unit cell according to another embodiment of the present application;

fig. 7 is a cross-sectional view of the cell of fig. 6 showing the connection relationship between the battery housing, the first end cap, the adapter and the cell;

fig. 8 is a cross-sectional view illustrating a connection relationship between a battery housing, a first end cap, an adaptor and a battery cell according to another embodiment of the present disclosure;

fig. 9 is a cross-sectional view illustrating a connection relationship between a battery housing, a first end cap, an adaptor and a battery cell according to another embodiment of the present disclosure;

FIG. 10 is an exploded view of area C of FIG. 4;

fig. 11 is a cross-sectional view illustrating a connection relationship between a battery housing, a first end cap, an adaptor and a battery cell according to another embodiment of the present application.

Reference numerals:

a battery case 100;

the battery comprises a battery cell 200, a battery cell main body 210, a tab 220, a first tab 221 and a second tab 222;

a first end cap 300, a channel 310, a conductive member 320, a first groove 330, a first substrate 340, a first connection portion 350;

the interposer 400, the second substrate 410, the second connection part 420, the third connection part 430, and the protrusion part 440;

a closure 500;

a second end cap 600, an insulating member 610, and a connection terminal 620.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

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

The embodiment of the application discloses a single battery, including battery case 100, electric core 200, first end cap 300 and adaptor 400, first end cap 300 has passageway 310, and first end cap 300 is connected with adaptor 400 electricity through electrically conductive 320 of passageway 310, and compared with the prior art, adaptor 400's simple structure, and can connect first end cap 300 and adaptor 400 from the outside of first end cap 300, it is more convenient to operate, and the following combines the figure to carry out the concrete description.

Referring to fig. 1 to 3, the battery case 100 may be a cylindrical case shown in the figures, the interior of the cylindrical case has an inner cavity for accommodating a battery cell, in a height direction of the battery case 100, two ends of the battery case 100 are provided with openings, both the openings are closed by end caps, for convenience of description, one end cap is named as a first end cap 300, the other end cap is named as a second end cap 600, referring to fig. 3, the second end cap 600 includes an insulating member 610 and a connection terminal 620, the insulating member 610 is in an annular structure, an inner ring of the insulating member 610 is sleeved outside the connection terminal 620, an outer ring of the insulating member 610 is connected to the battery case 100, and on the basis of closing the end opening of the battery case 100, the connection terminal 620 is connected to the battery case 100 in an insulating manner.

The battery cell 200 may be a cylindrical battery cell as illustrated, and specifically, referring to fig. 3, the battery cell 200 includes a cell main body 210 and tabs 220, wherein, in a height direction of the battery cell 200, the tabs 220 are disposed at two opposite ends of the cell main body 210, and for convenience of description, one tab 220 is named as a first tab 221, and the other tab 220 is named as a second tab 222. When the battery cell 200 is located in the battery case 100 and the end caps are assembled, the adaptor 400 is located between the first tab 221 and the first end cap 300, the first tab 221 abuts against the adaptor 400, so that the first tab 221 is electrically connected with the first end cap 300 through the adaptor 400, and the second tab 222 is electrically connected with the connection terminal 620, so that the connection terminal 620 and the first end cap 300 can be respectively used as electrodes for outputting the single battery.

Referring to fig. 4 and 5, the first end cap 300 has a through channel 310, the channel 310 may be a through hole, the single battery further includes a conductive member 320, the conductive member 320 is located in the channel 310, the first end cap 300 is fixedly connected to the adaptor 400 through the conductive member 320, and is conducted through the conductive member 320, it can be understood that the adaptor 400 may be conducted through a portion attached to the first end cap 300, in addition to the first end cap 300 being conducted through the conductive member 320 and the adaptor 400. Since the passage 310 is disposed through the first end cap 300, the first end cap 300 and the adaptor 400 can be connected from the outside of the first end cap 300, the operation space is larger, and the assembly difficulty can be reduced. On the other hand, the conductive member 320 for connecting the first end cap 300 and the adaptor 400 is mainly or entirely located in the channel 310, so that the occupation of the internal space of the battery case 100 can be reduced or avoided, the height of the battery cell 200 can be increased, and the energy density of the battery can be increased. In addition, the adaptor 400 may have a disk structure as shown in fig. 3, for example, and the structure can be simplified.

The first end cap 300 may be a separate structure, and may be fixed to the battery case 100 by welding or the like after being capped in the opening of the battery case 100, or the first end cap 300 may be an integral structure with the battery case 100, and for example, the first end cap 300 may be an end plate of the battery case 100.

In some embodiments, the first end cap 300 and the adaptor 400 are fixed by welding, the conductive member 320 is a welding portion filled in the channel 310 and solidified, when the first end cap 300 and the adaptor 400 are connected by using the embodiment, a welding device can weld the first end cap 300 from the outside, the welding connection strength is high, and the solidified welding portion can seal the channel 310 without providing an additional sealing structure.

When the first end cap 300 and the adaptor 400 are fixed by welding, the channel 310 may be a continuous welding seam arranged along the circumference of the first end cap 300, so as to form a C-shaped welding seam, and correspondingly, the conductive member 320 is a continuous strip-shaped welding portion arranged along the circumference of the first end cap 300, which can increase the connection strength between the first end cap 300 and the adaptor 400. Or, the channel 310 may also include a plurality of welding seams, the plurality of welding seams are sequentially arranged along the circumferential direction of the first end cap 300, and adjacent welding seams are disconnected, for example, as shown in fig. 2, the channel 310 includes two welding seams, both of which are arc-shaped, and correspondingly, the conductive component 320 includes two continuous strip-shaped welding portions, and on the basis that the total lengths of the welding seams are the same, the embodiment can both ensure the connection strength between the first end cap 300 and the adaptor 400, and can also increase the strength of the first end cap 300 itself. Still alternatively, the channel 310 includes a plurality of welding holes, the plurality of welding holes are sequentially arranged along the circumferential direction of the first end cap 300, and correspondingly, the conductive member 320 includes a plurality of welding points.

In other embodiments, the first end cap 300 is fixed to the adaptor 400 by a threaded connection, the conductive member 320 may be a threaded connector, the adaptor 400 is correspondingly provided with a threaded hole, and the conductive member 320 passes through the channel 310 from the outside of the first end cap 300 and is screwed into the threaded hole, so as to connect and connect the first end cap 300 to the adaptor 400. In this embodiment, in order to increase the sealing capability at the passage 310, a sealing member such as a gasket may be provided for sealing.

Referring to fig. 6 and 7, in other embodiments, the first end cap 300 has a first groove 330 on the outer side, the channel 310 is located at the bottom of the first groove 330, and when the conductive member 320 has a protruding portion protruding from the channel 310, the protruding portion can be received in the first groove 330, so that the bottom of the battery case 100 is prevented from being protruded, and the single batteries can be conveniently placed in the vertical direction.

In some embodiments, referring to fig. 7, the first end cap 300 includes a first substrate 340 and a first connection portion 350, the first connection portion 350 is recessed toward the adaptor 400 relative to the first substrate 340 to form a first groove 330, that is, in this embodiment, a portion of the first end cap 300 is recessed to form the first groove 330, and correspondingly, the inner side of the first end cap 300 forms a protrusion, and the first connection portion 350 protruding relative to the first substrate 340 is attached to the adaptor 400, and both are fixed by the conductive member 320. The above structure can form the first groove 330 to accommodate the portion of the conductive member 320 protruding from the channel 310, and on the other hand, compared with the way that the first end cap 300 is a flat plate structure and is entirely attached to the adaptor 400, the first connection portion 350 with a smaller area is more easily attached to the adaptor 400, which facilitates the connection between the first end cap 300 and the adaptor 400 through the conductive member 320.

In other embodiments, referring to fig. 8, when the first end cap 300 has a certain thickness, the first groove 330 may also be formed on the outer side of the first end cap 300 by, for example, removing material, so that the inner side of the first end cap 300 does not have a convex portion.

Referring to fig. 9, in some embodiments, the unit cell further includes a sealing member 500, and the sealing member 500 is connected to an outer side of the first end cap 300 and covers the conductive member 320 to prevent impurities such as welding slag and metal debris from falling off, and on the other hand, protects the conductive member 320 from oxidation corrosion. It should be noted that when the first groove 330 is provided on the outer side surface of the first end cap 300, the sealing member 500 is located in the first groove 330 and does not exceed the first groove 330, so as to avoid forming a protrusion on the bottom of the battery case 100.

The closure 500 may be a cured adhesive.

Referring to fig. 7 to 9, in some embodiments, the adaptor 400 includes a second substrate 410 and a second connection portion 420, the second connection portion 420 protrudes toward the first end cap 300 relative to the second substrate 410, for example, the adaptor 400 may be formed by stamping to form the second connection portion 420 protruding upward relative to the second substrate 410. The second connecting portion 420 is attached to the first end cap 300 and electrically connected to the conductive member 320, and the second substrate 410 abuts against the first tab 221. Compared with the way that the adaptor 400 is a flat plate structure and the whole part is attached to the first end cap 300, the second connection part 420 with a smaller area is more easily attached to the first end cap 300, so that the first end cap 300 and the adaptor 400 are conveniently connected through the conductive part 320.

It can be understood that, when the first end cap 300 includes the first substrate 340 and the first connecting portion 350, the adaptor 400 includes the second substrate 410 and the second connecting portion 420, the first connecting portion 350 protrudes toward the adaptor 400 relative to the first substrate 340, the second connecting portion 420 protrudes toward the first end cap 300 relative to the second substrate 410, and the first connecting portion 350 and the second connecting portion 420 are attached to each other to facilitate connection therebetween through the conductive member 320.

Referring to fig. 4 and 10, on the basis that the interposer 400 is provided with the second substrate 410 and the second connecting portion 420, the interposer 400 further includes a third connecting portion 430, the third connecting portion 430 extends toward the first end cap 300 relative to the second substrate 410, for example, the interposer 400 may form the third connecting portion 430 protruding upward relative to the second substrate 410 in a stamping manner, and the third connecting portion 430 and the second connecting portion 420 are both located on the same side of the second substrate 410, so that the third connecting portion 430 is attached to the first end cap 300 while the second connecting portion 420 is attached to the first end cap 300, and thus, an empty area of the interposer 400 may be reduced, and the interposer 400 may stably support the electrical core 200.

Along the radial direction of the interposer 400, the second connection portion 420 and the third connection portion 430 are located on two opposite sides of the second substrate 410, and taking the illustration as an example, the second connection portion 420 is located on the outer side of the second substrate 410, and the third connection portion 430 is located on the inner side of the second substrate 410, and the third connection portion 430 can prevent the middle area of the interposer 400 from being suspended.

Referring to fig. 11, in some embodiments, a protrusion 440 extends from the adaptor 400 toward a side of the first end cap 300, and the protrusion 440 is located within the channel 310, thereby positioning the adaptor 400 and the first end cap 300. The conductive element 320 is electrically connected to the protrusion 440 and the first end cap 300, respectively, in this embodiment, the conductive element 320 may be electrically connected to the protrusion 440 and the first end cap 300 by welding.

The application also discloses a battery pack, which comprises the box body and the single batteries of the above embodiments, wherein the single batteries are installed inside the box body.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims

1. A battery cell, comprising:

a battery case having an opening;

the end cover is covered and sealed on the opening of the battery shell, and a through channel is arranged on the end cover;

the adapter is positioned between the end cover and the lug and is abutted with the lug;

2. The cell defined in claim 1 wherein the outside of the end cap has a first groove and the channel is located at the bottom of the first groove.

3. The single cell of claim 2, wherein the end cap comprises a first substrate and a first connecting portion, the first connecting portion is recessed toward the adaptor relative to the first substrate to form the first groove, and the first connecting portion is attached to the adaptor.

4. The cell defined in any one of claims 1 to 3, further comprising a closure member that is attached to an outside of the end cap and covers the conductive member.

5. The battery cell as claimed in claim 1, wherein the adapter includes a second substrate and a second connecting portion, the second connecting portion extends toward the end cap relative to the second substrate, the second connecting portion is attached to the end cap and electrically connected to the conductive member, and the second substrate abuts against the corresponding tab.

6. The cell defined in claim 5, wherein the adapter further comprises a third connecting portion, the third connecting portion extends toward the end cap relative to the second substrate, the second connecting portion and the third connecting portion are located on two opposite sides of the second substrate along a radial direction of the adapter, and the third connecting portion is attached to the end cap.

7. The cell defined in claim 1, wherein a protrusion extends from a side of the adapter facing the end cap, the protrusion being located within the channel, and the conductive member being electrically connected to the protrusion and the end cap, respectively.

8. The battery cell as claimed in claim 1, wherein the conductive member is welded to the adaptor and the end cap, respectively.

9. The cell defined in claim 8, wherein the channel comprises a continuous weld seam disposed along a circumference of the end cap;

10. A battery pack, comprising:

a box body;

the cell of any one of claims 1 to 9, the cell being located within the case.