阅读说明：本技术 一种电芯、电池组及用电设备 (Battery cell, battery pack and electric equipment ) 是由 王隆兴 芦林 于 2021-08-09 设计创作，主要内容包括：本申请实施例涉及电池技术领域,特别公开了一种电芯、电池组及用电设备,包括电极组件、容纳电极组件的壳体、第一极耳和第二极耳,壳体包括容纳部和自容纳部延伸得到的顶封边,第一极耳和第二极耳的一端均与电极组件连接,第一极耳的另一端沿第一方向从顶封边伸出,第一极耳的另一端朝壳体的第一侧面的方向弯折延伸有第一延伸部,第二极耳的另一端朝壳体的第二侧面的方向弯折延伸有第二延伸部,其中,第一侧面和第二侧面沿第二方向相对设置,并且顶封边位于第一侧面和第二侧面之间,第一延伸部相对于第三方向呈倾斜设置,第二延伸部相对于第三方向呈倾斜设置。通过上述方式,本申请实施例能够降低相邻电芯串联时发生短路的风险。(The embodiment of the application relates to the technical field of batteries, and particularly discloses a battery core, a battery pack and electric equipment, which comprise an electrode assembly, a shell for accommodating the electrode assembly, a first tab and a second tab, wherein the shell comprises an accommodating part and a top seal edge obtained by extending from the accommodating part, one end of the first tab and one end of the second tab are both connected with the electrode assembly, the other end of the first tab extends out from the top seal edge along a first direction, the other end of the first tab is bent and extended towards the direction of a first side surface of the shell to form a first extending part, the other end of the second tab is bent and extended towards the direction of a second side surface of the shell to form a second extending part, the first side face and the second side face are arranged oppositely along the second direction, the top sealing edge is located between the first side face and the second side face, the first extending portion is arranged in an inclined mode relative to the third direction, and the second extending portion is arranged in an inclined mode relative to the third direction. Through the mode, the risk of short circuit when adjacent electric cores are connected in series can be reduced.)

1. A battery cell comprises an electrode assembly, a shell for accommodating the electrode assembly, a first tab and a second tab, wherein the shell comprises an accommodating part and a top seal edge which is obtained by extending from the accommodating part, one end of the first tab and one end of the second tab are both connected with the electrode assembly, the other end of the first tab and the other end of the second tab extend out of the top seal edge along a first direction,

the other end of the first tab bends and extends towards the direction of the first side face of the shell to form a first extending portion, the other end of the second tab bends and extends towards the direction of the second side face of the shell to form a second extending 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 extending portion is obliquely arranged relative to the third direction, the second extending portion is obliquely arranged relative to the third direction, and every two of the first direction, the second direction and the third direction are perpendicular to each other.

2. The cell of claim 1, wherein,

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

3. The cell of claim 1, wherein,

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

4. The cell of claim 1, wherein,

the first extension part is provided with a first long edge and a second long edge along the extension direction of the first extension part, the length of the first long edge is greater than that of the second long edge, and the length of the second long edge is h 1;

the vertical distance between one side of the top sealing edge close to the first tab and the bending edge of the first tab is h2, and the thickness of the top sealing edge is more than or equal to (h1+ h2) and less than or equal to 40 mm.

5. A battery pack, comprising a plurality of the battery cells of any one of claims 1 to 4, wherein the plurality of battery cells are stacked in sequence along the second direction, and the first extension portion of one of the battery cells is connected with the second extension portion of the other battery cell.

6. The battery pack according to claim 5,

a direction perpendicular to an extending direction of the first extending portion is a fourth direction, and a width of the first extending portion in the fourth direction is w 1;

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

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

7. The battery pack according to claim 6,

the empirical coefficient k is 1.2.

8. The battery pack according to claim 6,

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

9. The battery pack according to claim 6,

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

10. An electric device comprising the battery pack according to any one of claims 5 to 9.

Technical Field

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

Background

In the existing market, a common battery pack contains a single battery cell, and in order to meet the requirement of daily electric equipment, a plurality of battery cells are usually connected in series/parallel to form a new battery pack, and the new battery pack can drive electric equipment with larger rated voltage or drive electric equipment with better increased current and the like. The battery cells generally comprise an electrode assembly, a casing for accommodating the electrode assembly and tabs for connecting the electrode assembly, the tabs which vertically extend from the casing are generally connected in series/parallel, the positions of the tabs are different according to different top seal edges of the casing, and the tabs are positioned on the side faces close to the casing if the top seal edges of the casing are positioned on the side faces close to the casing. Generally, for the convenience of tab connection, when adjacent cells are connected in series, the tabs of the adjacent cells with opposite polarities are located on the same side, and when the adjacent cells are connected in parallel, the tabs of the adjacent cells with the same polarities are located on the same side.

In the process of implementing the present application, the inventors of the present application found that: when the adjacent battery cells with the lugs close to the side surfaces are connected in series, the lugs of the adjacent battery cells are opposite in polarity and are located on the same side, the lugs of the adjacent battery cells are opposite in polarity and close to the same side surfaces, and the spacing distance between the lugs of the adjacent battery cells is small, so that the battery pack is easy to generate short circuit and is very dangerous.

Disclosure of Invention

In view of the above problems, the embodiment of the application provides an electric core, a battery pack and an electric device, which overcome the problems that when the adjacent electric cores are connected in series, the spacing distance between the tabs of the adjacent electric cores is small, the battery pack is prone to short circuit and the like.

According to an aspect of an embodiment of the present application, there is provided a battery cell, including: the electrode assembly comprises an electrode assembly body, a shell, a first tab and a second tab, wherein the shell comprises an accommodating part and a top sealing edge, the top sealing edge is obtained by extending the accommodating part, one end of the first tab and one end of the second tab are connected with the electrode assembly body, the other end of the first tab and the other end of the second tab extend out of the top sealing edge along a first direction, the other end of the first tab bends and extends towards the first side surface of the shell to form a first extending part, the other end of the second tab bends and extends towards the second side surface of the shell to form a second extending part, the first side surface and the second side surface are oppositely arranged along a second direction, the top sealing edge is positioned between the first side surface and the second side surface, the first extending part is obliquely arranged relative to a third direction, and the second extending part is obliquely arranged relative to the third direction, the first direction, the second direction and the third direction are mutually vertical pairwise. When adjacent electric core is established ties, utilize the first extension of an electric core to be connected with the second extension of another electric core, the same utmost point ear of polarity of adjacent electric core lies in same one side, and at this moment, the interval distance is great between the different polarity utmost point ears of adjacent electric core to it takes place the short circuit, comparatively safety to reduce the group battery.

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

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

In an alternative mode, the first extending portion is provided with a first long side and a second long side along the extending direction of the first extending portion, 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 h 1; the vertical distance between one side of the top sealing edge close to the first tab and the bending edge of the first tab is h2, and the thickness of the top sealing edge is more than or equal to (h1+ h2) and less than or equal to 40 mm.

According to another aspect of embodiments of the present application, there is provided a battery pack including: a plurality of electric cores as above, it is a plurality of electric core is followed the second direction piles up in proper order, two adjacent first extension and the second extension of another electric core of a battery in the electric core are connected.

In an alternative mode, the direction perpendicular to the extending direction of the first extending portion is a fourth direction, and the width of the first extending portion in the fourth direction is w 1; the other direction perpendicular to the extending direction of the first extending portion is a fifth direction, the thickness of the first extending portion in the fifth direction is t, and the fifth direction and the fourth direction are perpendicular to each other; the joint of the first extension part and the second extension part forms an overlapping area, the overlapping area S of the overlapping area is larger than or equal to k multiplied by w1 multiplied by t, wherein k is an empirical coefficient.

In an alternative, the empirical coefficient k is 1.2.

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

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

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

The beneficial effects of the embodiment of the application are that: different from the prior art, the embodiment of the present application includes an electrode assembly, a housing for housing the electrode assembly, a first tab and a second tab, the housing includes a housing and a top sealing edge extended from the housing, one end of the first tab and one end of the second tab are both connected to the electrode assembly, the other end of the first tab and the other end of the second tab extend from the top sealing edge along a first direction, the other end of the first tab bends and extends towards a first side of the housing to form a first extending portion, the other end of the second tab bends and extends towards a second side of the housing to form a second extending portion, wherein the first side and the second side are oppositely disposed along a second direction, the top sealing edge is located between the first side and the second side, and the first extending portion is obliquely disposed relative to a third direction, the second extension is the slope setting for the third direction, two liang of mutually perpendicular between first direction, second direction and the third direction sets up like this, when adjacent electric core is established ties, utilizes one the first extension of electric core is connected with the second extension of another electric core, and the same utmost point ear of polarity of adjacent electric core lies in same one side, and at this moment, the interval distance is great between the different polarity utmost point ear of adjacent electric core to it takes place the short circuit, comparatively safety to reduce the group battery.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions 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 an internal structure of a single battery cell in 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 before a cell of an embodiment of the present application is not used;

fig. 5 is a schematic view of a cell in an embodiment of the present application in a further state before the cell is not used;

fig. 6 is a schematic view of a cell in an embodiment of the present application in a further state before the cell is not used;

fig. 7 is a schematic diagram of another state of a cell in an embodiment of the present application before being used;

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

fig. 9 is a plan 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 in an embodiment of the present application.

Detailed Description

In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

In the present embodiment, the battery cell 10 is used as an example of a battery pack, and it should be understood that the battery cell 10 may be applied to other products besides a battery pack.

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

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

Specifically, as shown in fig. 2, each of the battery cells 10 includes an electrode assembly 101, a casing 102 for accommodating the electrode assembly 101, and a first tab 103 and a second tab 104 electrically connected to the electrode assembly 101. The case 102 includes a receiving part 1021 and a top sealing edge 1022 extending from the receiving part 1021, one end of each of the first tab 103 and the second tab 104 is connected to the electrode assembly 101, and the other end of each of the first tab 103 and the second tab 104 protrudes from the top sealing edge 1022 in a first direction. The receiving portion 1021 is configured to receive the electrode assembly 101, and the top sealing edge 1022 seals the electrode assembly 101 received in the case 102, so as to limit the ingress of external moisture into 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 as long as the polarities of the first tab 103 and the second tab 104 are opposite to each other.

In some embodiments, as shown in fig. 3, a first extending portion 103a is bent and extended from the other end of the first tab 103 toward the first side surface 102a of the casing 102, and the first extending portion 103a is disposed in an inclined manner with respect to the third direction, and the first extending portion 103a may be used for connecting adjacent battery cells 10.

In some embodiments, the other end of the second tab 104 is bent and extends toward the second side surface 102b of the casing 102 to form a second extending portion 104a, and the second extending portion 104a is disposed obliquely with respect to the third direction, when adjacent battery cells 10 are connected in series, the first extending portion 103a of one battery cell 10 of the two adjacent battery cells 10 is connected to the second extending portion 104a of the other battery cell 10, so as to implement the series connection of the adjacent battery cells 10.

It should be understood that, since the housing 102 is generally provided with a plurality of side walls, correspondingly, the housing 102 comprises a plurality of side surfaces, wherein the first side surface 102a and the second side surface 102b of the housing 102 are a pair of side surfaces oppositely arranged along the second direction, and the top sealing edge 1022 is located between the first side surface 102a and the second side surface 102 b. It is understood that when the casing 102 is configured in a cylindrical shape or other shapes, the first extension portion 103a and the second extension portion 104a provided on the battery cell 10 for series connection of the adjacent battery cells 10 are also applicable.

In some embodiments, an angle K1 between the first extending portion 103a and the third direction is the same as an angle K2 between the second extending portion 104a and the opposite direction of the third direction, that is, K1 is K2, which indicates that the first extending portion 103a and the second extending portion 104a are disposed in parallel. It is understood that the angle between the first extending portion 103a and the third direction and the angle between the second extending portion 104a and the opposite direction of the third direction can be set according to practical situations, and is not limited to the case where K1 is K2.

It should be noted that: in an actual production process, the first tab 103 and the second tab 104 extend from the top edge 1022 in a first direction, at this time, the first extending portion 103a is bent with respect to the first direction, and has a bending angle a, and then the first extending portion 103a is bent toward the first side surface 102a according to actual needs, and similarly, the second extending portion 104a is also bent with respect to the first direction, and has a bending angle b, and then the second extending portion 104a is bent toward the second side surface 102b according to actual needs. As can be seen, the first extension 103a and the second extension 104a may be bent with respect to the first side surface 102a and the second side surface 102b, for example: as shown in fig. 4, the first extension portion 103a and the second extension portion 104a are bent toward the third direction at the same time, or, as shown in fig. 5, the first extension portion 103a and the second extension portion 104a are bent toward the opposite direction to the third direction at the same time, or, as shown in fig. 6, the first extension portion 103a and the second extension portion 104a are bent toward each other, or, as shown in fig. 7, the first extension portion 103a and the second extension portion 104a are bent away from each other. It should be understood that there are many cases where the first extending portion 103a and the second extending portion 104a are arranged before being bent with respect to the first side surface 102a and the second side surface 102b, as long as the first extending portion 103a is arranged to be inclined with respect to the third direction after being bent with respect to the first side surface 102a, and the second extending portion 104a is arranged to be inclined with respect to the third direction after being bent with respect to the second side surface 102 b.

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

In some embodiments, as shown in fig. 3, 8 and 9, the first extending portion 103a has a first long side 103ab and a second long side 103aa along the extending direction thereof, the length of the first long side 103ab is greater than that of the second long side 103aa, the length of the second long side 103aa is h1, the perpendicular distance between the side of the top sealing edge 1022 close to the first tab 103 and the bending side of the first tab 103 is h2, and the thickness is 10mm ≦ (h1+ h2) ≦ 40 mm.

For better describing the size of the first extending portion 103a, the first extending portion 103a is defined to have an extending direction, a fourth direction and a fifth direction, wherein the extending direction is mutually perpendicular to the fourth direction and the fifth direction in pairs.

In some embodiments, as shown in fig. 3, 8 and 10, the width of the first extending portion 103a along the fourth direction is w1, the thickness of the first extending portion 103a along the fifth direction is t, an overlapping area is formed at the junction of the first extending portion 103a and the second extending portion 104a, and the overlapping area is S ≧ k × w1 × t, where k is an empirical coefficient.

In some embodiments, the empirical coefficient k is 1.2.

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

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

In the embodiment of the present application, by providing an electrode assembly 101, a case 102 accommodating the electrode assembly 101, a first tab 103 and a second tab 104, the case 102 includes an accommodating portion 1021 and a top sealing edge 1022 extending from the accommodating portion 1021, one end of each of the first tab 103 and the second tab 104 is connected to the electrode assembly 101, the other end of each of the first tab 103 and the second tab 104 extends from the top sealing edge 1022 in a first direction, the other end of the first tab 103 is bent and extends to a first extending portion 103a in a direction of a first side surface 102a of the case 102, the other end of the second tab 104 is bent and extends to a second extending portion 104a in a direction of a second side surface 102b of the case 102, wherein the first side surface 102a and the second side surface 102a are opposite to each other in a second direction, and the top sealing edge 1022 is located between the first side surface 102a and the second side surface 102b, the first extending portion 103a is arranged in an inclined manner relative to the third direction, the second extending portion 104a is arranged in an inclined manner relative to the third direction, and the first direction, the second direction and the third direction are mutually perpendicular to each other in a pairwise manner, so that when adjacent electric cores 10 are connected in series, the first extending portion 103a of the electric core 10 is connected with the second extending portion 104a of another electric core 10, the same polar lugs of the adjacent electric cores 10 are located on the same side, and at the moment, the spacing distance between the polar lugs with different polarities of the adjacent electric cores 10 is large, so that short circuit of the battery pack is reduced, and the battery pack is safe.

The application also provides an embodiment of an electric device, the electric device includes the battery pack, and the functions and the structure of the battery pack can refer to the embodiment described above, which is not described in detail herein.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.