CN113675543B

CN113675543B - Battery cell, battery pack and electric equipment

Info

Publication number: CN113675543B
Application number: CN202110910162.9A
Authority: CN
Inventors: 王隆兴; 芦林
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2023-05-02
Anticipated expiration: 2041-08-09
Also published as: CN113675543A

Abstract

The embodiment of the application relates to the technical field of batteries, disclose a battery cell, group battery and consumer especially, including electrode assembly, hold electrode assembly's casing, first utmost point ear and second utmost point ear, the casing includes holding portion and extends the top edge seal that obtains from holding portion, the one end of first utmost point ear and second utmost point ear all is connected with electrode assembly, the other end of first utmost point ear is followed the top edge seal and is stretched out, the other end of first utmost point ear is buckled towards the direction of the first side of casing and is extended and have first extension, the other end of second utmost point ear is buckled towards the direction of the second side of casing and is extended and have second extension, wherein, first side and second side are along the relative setting of second direction, and the top edge seal is located between first side and the second side, first extension is the slope setting for the third direction, the second extension is the slope setting for the third direction. Through the mode, the risk of short circuit when adjacent battery cells are connected in series can be reduced.

Description

Battery cell, battery pack and electric equipment

Technical Field

The embodiment of the application relates to the technical field of batteries, in particular to a battery cell, a battery pack and electric equipment.

Background

In the current market, a commonly used battery pack contains a single electric core, and in order to meet the needs of daily electric equipment, a plurality of electric cores are generally connected in series/in parallel to form a new battery pack, and the new battery pack can drive the electric equipment with larger rated voltage or drive the electric equipment with better increased current. The battery cells generally include an electrode assembly, a housing accommodating the electrode assembly, and tabs connected to the electrode assembly, and the plurality of battery cells are generally connected in series/parallel by using tabs perpendicularly extending from the housing, and according to different positions of top edges of the housing, the positions of the tabs are different, and if the top edges of the housing are located near the side of the housing, the tabs are located near the side of the housing. In general, in order to facilitate the connection of the tabs, when adjacent cells are connected in series, the tabs with opposite polarities of the adjacent cells are located on the same side, and when the adjacent cells are connected in parallel, the tabs with the same polarities of the adjacent cells are located on the same side.

In carrying out the present application, the inventors of the present application found that: when adjacent battery cells close to the side surfaces are connected in series, as the polar opposite lugs of the adjacent battery cells are positioned on the same side, and the same side surfaces close to the polar opposite lugs on the adjacent battery cells are oppositely arranged, the interval distance between the lugs of the adjacent battery cells is smaller, so that the battery pack is easy to short-circuit and dangerous.

Disclosure of Invention

In view of the above problems, embodiments of the present application provide a battery cell, a battery pack, and electric equipment, which overcome the problems that when the adjacent battery cells are connected in series, the spacing distance between the tabs of the adjacent battery cells is small, and the battery pack is easy to generate short circuit.

According to an aspect of an embodiment of the present application, there is provided a battery cell including: electrode assembly, hold electrode assembly's casing, first utmost point ear and second utmost point ear, the casing include the holding part with from the top seal limit that holding part extends the acquisition, the one end of first utmost point ear and second utmost point ear all with electrode assembly connects, the other end of first utmost point ear and second utmost point ear follows the top seal limit stretches out, the other end of first utmost point ear towards the direction bending extension of the first side of casing has first extension, the other end of second utmost point ear towards the direction bending extension of the second side of casing has second extension, wherein, first side and second side are along the relative setting of second direction, and the top seal limit is located between first side and the second side, first extension is the slope setting for the third direction, the second extension is the slope setting for the third direction, two looks mutual perpendicular between first direction, second direction and the third direction. When adjacent electric cores are connected in series, the first extension part of one electric core is connected with the second extension part of the other electric core, the polar same-polar lugs of the adjacent electric cores are positioned on the same side, at the moment, the interval distance between the polar lugs of the different polarities of the adjacent electric cores is larger, and therefore short circuit of the battery pack is reduced, and the battery pack is safer.

In an alternative form, the angle between the first extension and the third direction is the same as the angle between the second extension and the opposite direction to the third direction. The first extension part and the second extension part are parallel to each other.

In an alternative way, the first extension protrudes from the first side and/or the second extension protrudes from the second side. By the arrangement, the connection area between the first extending part and the second extending part of the adjacent battery cells can be increased, so that the connection between the first extending part and the second extending part is more stable and firm.

In an alternative manner, the first extension has a first long side and a second long side along a direction in which it extends, a length of the first long side is greater than a length of the second long side, and a length of the second long side is h1; the vertical distance between one side of the top sealing edge, which is close to the first tab, and the bending edge of the first tab is h2, and the thickness of the top sealing edge is less than or equal to 10mm and less than or equal to (h1+h2) and less than or equal to 40mm.

According to another aspect of an embodiment of the present application, there is provided a battery pack including: the plurality of battery cells are stacked in sequence along the second direction, and the first extension part of one battery cell in the two adjacent battery cells is connected with the second extension part of the other battery cell.

In an alternative manner, a direction along an extending direction perpendicular to the first extending portion is a fourth direction, and a width of the first extending portion along the fourth direction is w1; the other direction along the extending direction perpendicular to the first extending part is a fifth direction, the thickness of the first extending part along the fifth direction is t, and the fifth direction and the fourth direction are perpendicular to each other; and a joint of the first extension part and the second extension part forms a superposition area, wherein the superposition area S of the superposition area is more than or equal to k multiplied by w1 multiplied by t, and k is an empirical coefficient.

In an alternative, the empirical factor k is 1.2.

In an alternative manner, the value range of w1 is: w1 is more than or equal to 5mm and less than or equal to 50mm.

In an alternative manner, the value range of t is: t is more than or equal to 0.05mm and less than or equal to 0.5mm.

According to another aspect of an embodiment of the present application, there is provided a powered device, including: a battery pack as described above.

The beneficial effects of the embodiment of the application are that: in the case of distinguishing prior art, this application embodiment is through being provided with electrode assembly, holding electrode assembly's casing, first utmost point ear and second utmost point ear, the casing include holding portion with from holding portion extends the top edge banding that obtains, first utmost point ear and the one end of second utmost point ear all with electrode assembly connects, the other end of first utmost point ear and second utmost point ear is followed along first direction top edge banding stretches out, the other end of first utmost point ear towards the direction bending extension of the first side of casing has first extension, the other end of second utmost point ear towards the direction bending extension of the second side of casing has second extension, wherein, first side and second side are along the relative setting of second direction, and top edge banding is located between first side and the second side, first extension is the slope setting for the third direction, second extension is the slope setting for the third direction, two looks setting up like this, two looks mutual pole cores are in the direction between the first direction, and two looks setting up when the first looks battery core, and the mutual polarity is comparatively adjacent to take place the electric core, the comparatively short circuit is relatively big one side, and the electric core is relatively big, and the electric adjacent is connected to the same side.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

FIG. 1 is a schematic view of the overall structure of a battery pack according to an embodiment of the present application;

FIG. 2 is a schematic diagram of the internal structure of a single cell according to an embodiment of the present application;

FIG. 3 is a schematic top view of a cell according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a state of the battery cell before the battery cell is not used in the embodiment of the present application;

FIG. 5 is a schematic diagram of a cell according to an embodiment of the present application in yet another state before use;

FIG. 6 is a schematic diagram of a cell according to an embodiment of the present application in yet another state before it is not used;

FIG. 7 is a schematic diagram of another state of the cell before the cell is not used in accordance with an embodiment of the present application;

FIG. 8 is an enlarged schematic view of the structure shown at A in FIG. 5;

FIG. 9 is a top view of the overall structure of a battery pack according to an embodiment of the present application;

fig. 10 is a side view of a single cell of an embodiment of the present application.

Detailed Description

In order to facilitate an understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application in this description is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the invention described below can be combined with one another as long as they do not conflict with one another.

In this embodiment, the battery cell 10 is used in a battery pack as an example, and it should be understood that the battery cell 10 may be used in products other than battery packs.

For better explanation of the structure of the battery pack, the structure of the battery pack will be described with reference to the X, Y, Z coordinate axes, wherein the X, Y, Z coordinate axes are perpendicular to each other, the first direction is the positive direction of the Z axis, the second direction is the positive direction of the X axis, and the third direction is the positive direction of the Y axis.

Referring to fig. 1-3, the battery pack 01 includes a plurality of cells 10 stacked in sequence along a second direction, and adjacent cells 10 are connected in series.

Specifically, as shown in fig. 2, each of the battery cells 10 includes an electrode assembly 101, a case 102 for accommodating the electrode assembly 101, and first and

second tabs

103 and 104 electrically connected to the electrode assembly 101. The case 102 includes a receiving portion 1021 and a top sealing edge 1022 extending from the receiving portion 1021, one ends of the first and

second tabs

103 and 104 are connected to the electrode assembly 101, and the other ends of the first and

second tabs

103 and 104 protrude from the top sealing edge 1022 in a first direction. The accommodating portion 1021 is configured to accommodate the electrode assembly 101, and the top sealing edge 1022 seals the electrode assembly 101 accommodated in the case 102, so as to limit external moisture from entering the case 102. Optionally, the first tab 103 is a positive tab, and the second tab 104 is a negative tab. It is to be understood that the polarities of the first tab 103 and the second tab 104 are not limited, so long as the polarities of the first tab 103 and the second tab 104 are opposite.

In some embodiments, as shown in fig. 3, the other end of the first tab 103 is bent and extended toward the first side 102a of the housing 102 to form a first extension 103a, and the first extension 103a is disposed obliquely with respect to the third direction, and the first extension 103a may be used for connection between adjacent cells 10.

In some embodiments, the other end of the second tab 104 is bent and extended toward the second side 102b of the housing 102 to form a second extension 104a, and the second extension 104a is inclined with respect to the third direction, so that when the adjacent cells 10 are connected in series, the first extension 103a of one cell 10 and the second extension 104a of the other cell 10 of the two adjacent cells 10 are connected, thereby realizing the series connection of the adjacent cells 10.

It should be appreciated that, since the housing 102 is generally provided with a plurality of side walls, the housing 102 includes a plurality of sides, respectively, wherein the first side 102a and the second side 102b of the housing 102 are a pair of sides disposed opposite to each other along the second direction, and the top sealing edge 1022 is disposed between the first side 102a and the second side 102b. It will be appreciated that when the housing 102 is configured in a cylindrical or other shape, the provision of the first extension 103a and the second extension 104a on the cell 10 for the series connection of the adjacent cells 10 is equally applicable.

In some embodiments, the angle K1 between the first extension 103a and the third direction is the same as the angle K2 between the second extension 104a and the opposite direction of the third direction, that is, k1=k2, which indicates that the first extension 103a and the second extension 104a are disposed in parallel. It is understood that the angle between the first extension 103a and the third direction and the angle between the second extension 104a and the opposite direction of the third direction may be set according to the actual situation, and is not limited to the case of k1=k2.

It should be noted that: in the actual production process, the first tab 103 and the second tab 104 extend from the top edge 1022 along a first direction, at this time, the first extension 103a is in a bending state relative to the first direction, and has a bending angle a, then, according to actual needs, the first extension 103a is bent toward the first side 102a, and similarly, the second extension 104a is in a bending state relative to the first direction, and has a bending angle b, and then, according to actual needs, the second extension 104a is bent toward the second side 102b. It can be seen that the first extension 103a and the second extension 104a may have a plurality of conditions before being bent with respect to the first side 102a and the second side 102b, for example: the first extension portion 103a and the second extension portion 104a are bent in a third direction at the same time, as shown in fig. 4, or the first extension portion 103a and the second extension portion 104a are bent in a direction opposite to the third direction at the same time, as shown in fig. 5, or the first extension portion 103a and the second extension portion 104a are bent in a direction opposite to each other, as shown in fig. 6, or the first extension portion 103a and the second extension portion 104a are bent in a direction opposite to each other, as shown in fig. 7. It should be understood that, although there are various situations before the first extension portion 103a and the second extension portion 104a are bent with respect to the first side surface 102a and the second side surface 102b, it is only required that the first extension portion 103a is bent with respect to the first side surface 102a and then disposed obliquely to the third direction, and that the second extension portion 104a is bent with respect to the second side surface 102b and then disposed obliquely to the third direction.

In some embodiments, the first extension 103a protrudes from the first side 102a and/or the second extension 104a protrudes from the second side 102b. When adjacent cells 10 are connected in series, the first extension 103a of one cell 10 is connected with the second extension 104a of another cell 10, and when the first extension 103a protrudes out of the first side 102a, connection between one cell 10 and the second extension 104a of another cell 10 can be facilitated, and meanwhile, the connection area between the first extension 103a and the second extension 104a is increased, so that connection between the first extension 103a and the second extension 104a is more stable and firm. Similarly, when the second extension portion 104a protrudes from the second side 102b, the connection area between the first extension portion 103a and the second extension portion 104a of the adjacent cells 10 can be increased, so that the connection between the first extension portion 103a and the second extension portion 104a is more stable and firm.

In some embodiments, as shown in fig. 3, 8 and 9, the first extension 103a has a first long side 103ab and a second long side 103aa along the extension direction thereof, and the length of the first long side 103ab is greater than the length of the second long side 103aa, the length of the second long side 103aa is h1, the vertical distance between the side of the top sealing edge 1022 adjacent to the first tab 103 and the bent side of the first tab 103 is h2, and the length of 10mm (h1+h2) is 40mm.

For better explanation of the dimensions of the first extension portion 103a, the first extension portion 103a is defined to have an extension direction, a fourth direction and a fifth direction, wherein the extension direction is perpendicular to the fourth direction and the fifth direction.

In some embodiments, as shown in fig. 3, 8 and 10, the width of the first extension portion 103a along the fourth direction is w1, the thickness of the first extension portion 103a along the fifth direction is t, the junction between the first extension portion 103a and the second extension portion 104a forms a superposition area, and the superposition area of the superposition area is s≡kxw1×t, where k is an empirical coefficient.

In some embodiments, the empirical factor k is 1.2.

In some embodiments, the range of values of w1 is: w1 is more than or equal to 5mm and less than or equal to 50mm.

In some embodiments, the range of values of t is: t is more than or equal to 0.05mm and less than or equal to 0.5mm.

In this application embodiment, through being provided with electrode assembly 101, hold electrode assembly 101's casing 102, first utmost point ear 103 and second utmost point ear 104, casing 102 includes accommodation portion 1021 and certainly the top edge sealing 1022 that the extension of accommodation portion 1021 obtained, first utmost point ear 103 and the one end of second utmost point ear 104 all with electrode assembly 101 is connected, the other end of first utmost point ear 103 and second utmost point ear 104 follow the first direction follow top edge sealing 1022 stretches out, the other end of first utmost point ear 103 towards the direction bending extension of the first side 102a of casing 102 has first extension 103a, the other end of second utmost point ear 104 towards the direction bending extension of the second side 102b of casing 102 has second extension 104a, wherein, first side 102a and second along the relative setting of second direction, and top edge sealing 1022 is located between third side 102a and the second side 102b, first extension 103a is the slope setting for the third direction, second electrode core 103a is the slope setting for the third direction, and is the second electrode core 10 and is the second and is relatively more than the same as the first electrode core 10 and the second electrode core 10, thereby the electric wire 10 is adjacent to the second electrode core 10, and the mutual polarity is relatively the same, and the electric wire 10 is relatively more than the same, and the electric wire 10 is connected in this way.

The application also provides an embodiment of the electric equipment, the electric equipment comprises the battery pack, and functions and structures of the battery pack can be referred to the embodiment, and are not repeated herein.

The foregoing description is only exemplary embodiments of the present application and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the present application.

Claims

1. The battery pack comprises a plurality of battery cells, wherein the battery cells are sequentially stacked along a second direction, the battery cells comprise an electrode assembly, a shell for accommodating the electrode assembly, a first tab and a second tab, the shell comprises an accommodating part and a top sealing edge which is obtained by extending from the accommodating part, one ends of the first tab and the second tab are connected with the electrode assembly, the other ends of the first tab and the second tab extend out of the top sealing edge along the first direction,

the other end of the first tab is bent and extended towards the direction of the first side face of the shell, the other end of the second tab is bent and extended towards the direction of the second side face of the shell, the first extension portion is parallel to the second extension portion, the first side face and the second side face are oppositely arranged along the second direction, the top sealing edge is located between the first side face and the second side face, the first extension portion is obliquely arranged relative to the third direction, the second extension portion is obliquely arranged relative to the third direction, the first extension portion of one cell and the second extension portion of the other cell in two adjacent cells are connected, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The battery pack of claim 1, wherein the battery pack comprises a plurality of cells,

the included angle between the first extension part and the third direction is the same as the included angle between the second extension part and the opposite direction of the third direction.

3. The battery pack of claim 1, wherein the battery pack comprises a plurality of cells,

the first extension part protrudes from the first side surface, and/or the second extension part protrudes from the second side surface.

4. The battery pack of claim 1, wherein the battery pack comprises a plurality of cells,

the first extension part is provided with a first long side and a second long side along the extension direction, the length of the first long side is larger than that of the second long side, and the length of the second long side is h1;

the vertical distance between one side of the top sealing edge, which is close to the first tab, and the bending edge of the first tab is h2, and the vertical distance is 10mm (h1+h2) to 40mm.

5. The battery pack of claim 1, wherein the battery pack comprises a plurality of cells,

a fourth direction along a direction perpendicular to the extending direction of the first extending portion, wherein the width of the first extending portion along the fourth direction is w1;

the other direction along the extending direction perpendicular to the first extending part is a fifth direction, the thickness of the first extending part along the fifth direction is t, and the fifth direction and the fourth direction are perpendicular to each other;

and a joint of the first extension part and the second extension part forms a superposition area, wherein the superposition area S of the superposition area is more than or equal to k multiplied by w1 multiplied by t, and k is an empirical coefficient.

6. The battery pack of claim 5, wherein the battery pack comprises a plurality of cells,

the empirical factor k is 1.2.

7. The battery pack of claim 5, wherein the battery pack comprises a plurality of cells,

the value range of w1 is as follows: w1 is more than or equal to 5mm and less than or equal to 50mm.

8. The battery pack of claim 5, wherein the battery pack comprises a plurality of cells,

the value range of t is as follows: t is more than or equal to 0.05mm and less than or equal to 0.5mm.

9. A powered device comprising a battery pack as claimed in any one of claims 1-8.