CN114614210A

CN114614210A - Electrochemical device, battery module, and electronic apparatus

Info

Publication number: CN114614210A
Application number: CN202210273196.6A
Authority: CN
Inventors: 陈锦辉
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-06-10
Anticipated expiration: 2042-03-18
Also published as: CN114614210B

Abstract

The utility model relates to an electrochemical device, battery module and electronic equipment, which comprises a housin, first utmost point ear and second utmost point ear, first utmost point ear includes first connecting portion and the first extension that obtains from the first connecting portion straight line extension, the second utmost point ear includes second connecting portion and the second extension that obtains from the second connecting portion straight line extension, first utmost point ear and second utmost point ear homogeneous phase are the slope setting for first direction and second direction, the casing includes the relative first side and the second side that set up in the third direction, first extension is used for buckling towards the direction of first side, the second extension is used for buckling towards the direction of second side. In the application, a deep pit surface can be connected with a shallow pit surface in a manner of facing the shallow pit surface so as to increase the connection area of the tabs; first utmost point ear and second utmost point ear are sharp, and sharp utmost point ear of straightening can adopt the coil stock form to produce, easily manufacturing need not to develop new special-shaped utmost point ear again to reduction in production cost can effectively improve production efficiency.

Description

Electrochemical device, battery module, and electronic apparatus

[ technical field ] A method for producing a semiconductor device

The embodiment of the application relates to the technical field of batteries, in particular to an electrochemical device, a battery module and electronic equipment.

[ background of the invention ]

With the continuous enhancement of environmental awareness of people, new energy technology has been developed rapidly, and the technology of using electric power as a power system is being applied to more fields step by step, wherein the expression form of the power system is to combine a plurality of battery cells to construct a battery module, and then supply power through the battery module, so for the power system, how to combine a plurality of battery cells into a group is an important technology.

The traditional battery combination grouping method is to stack up a plurality of single batteries in sequence, and in two adjacent single batteries, the positive pole lug of one single battery needs to be connected with the negative pole lug of another single battery, and because the casing dashes the reason of hole, the distance between the pole lugs of two adjacent single batteries often can appear is less, makes the connection area between two pole lugs not enough, easily leads to the group battery to take place the short circuit.

[ summary of the invention ]

The embodiment of the application aims to provide an electrochemical device, a battery module and electronic equipment, so that the tab connection area of two adjacent single batteries can be at least increased.

In order to solve the technical problem, the embodiment of the application adopts the following technical scheme:

in a first aspect, an embodiment of the present application provides an electrochemical device, including a housing, a first tab and a second tab, the first tab has a first connection portion and a first extension portion, the second tab has a second connection portion and a second extension portion, the first connection portion and the second connection portion are both disposed in the housing, and the first extension portion and the second extension portion both extend out of the housing. The first extension part is obtained by extending the first connecting part in a straight line, the second extension part is obtained by extending the second connecting part in a straight line, and the first lug and the second lug are both obliquely arranged relative to the first direction and the second direction. The shell comprises a first side face and a second side face which are oppositely arranged in a third direction, the first extending portion is used for bending towards the first side face, and the second extending portion is used for bending towards the second side face. The first direction, the second direction and the third direction are mutually vertical pairwise.

In the technical scheme of the embodiment, when the first extension parts of the electrochemical devices are bent towards the first side surface and the second extension parts are bent towards the second side surface, the first extension parts can be directly obliquely connected with the second extension parts of the other electrochemical devices in the third direction, therefore, when the electrochemical devices are connected into a group, the adjacent two electrochemical devices can adopt a connection mode that the deep pits face the shallow pits, so that a sufficient distance is ensured between the two electrochemical devices, meanwhile, the extension parts of the two electrochemical devices are obliquely connected in the third direction, the connection area of the tabs can be further increased, and the risk of short circuit is reduced. In addition, because each electrochemical device adopts a connection mode that the deep pit faces the shallow pit face, the intervals between the electrochemical devices are the same, and therefore, the buffer parts with the same thickness specification can be arranged between every two adjacent electrochemical devices, the manufacturing process is simplified, and the production cost is reduced. In addition, the first extension part is linearly extended by the first connecting part, and the second extension part is linearly extended by the second connecting part, so that the first lug and the second lug are linearly shaped, the linearly shaped lugs can be produced in a coil material mode, the production and the manufacture are easy, new special-shaped lugs do not need to be developed again, the production cost is further reduced, and the production efficiency can be effectively improved.

As a further improvement of the above technical solution, the electrochemical device further includes an electrode assembly having a first pole piece and a second pole piece, and the first pole piece and the second pole piece are sequentially stacked or wound. The first pole piece is provided with a first sub-pole lug, the first pole lug is connected with the first sub-pole lug, and the inclination direction of the first sub-pole lug is consistent with the inclination direction of the first pole lug connected with the first pole lug. The second pole piece is provided with a second sub-pole lug, the second pole lug is connected with the second sub-pole lug, and the inclination direction of the second sub-pole lug is consistent with that of the first pole lug connected with the second sub-pole lug.

In the technical scheme of this embodiment, the tab and the sub-tab can be welded together through a transfer welding process to ensure that the set current of the two tabs is respectively conducted on the sub-tabs of the two pole pieces. The inclination direction of the sub-pole lug is consistent with that of the pole lug, and the design can ensure that the welding area of the pole lug and the sub-pole lug is the largest, so that the smooth circulation of current is ensured.

As a further improvement of the above technical solution, along the first direction, the vertical height of the first sub-tab is 8-20 mm; and/or along the first direction, the vertical height of the second sub-tab is 8-20 mm. The height of the sub-tabs is related to the thickness of the electrode assembly, and generally, the height of the sub-tabs is 8-20 mm.

As a further improvement of the above technical solution, the first extending portion has a first long side and a first short side along an extending direction thereof, a length of the first long side is greater than a length of the first short side along the extending direction of the first extending portion, and the length of the first long side is 10-40 mm; and/or, the second extension has long limit of second and second minor face along its extending direction, follows the extending direction of second extension, the length on long limit of second is greater than the length on short face of second, the length on long limit of second is 10 ~ 40 millimeters.

The length of the first long edge can be determined based on the center distance of the tabs and the thickness of the electrochemical device, and the larger the center distance of the tabs is, the larger the length of the first long edge is; the greater the thickness of the electrochemical device, the greater the length of the first long side; the length of the first long side is usually 10 to 40 mm, preferably 15 to 25 mm. The second long side is the same.

As a further improvement of the above technical solution, along the second direction, the inclination angle of the first tab and the inclination angle of the second tab satisfy any one of the following conditions:

(a) the inclination angle of the first tab and the inclination angle of the second tab are both 25-60 degrees;

(b) the inclination angle of the first tab and the inclination angle of the second tab are both 120-155 degrees;

(c) the inclination angle of the first pole lug is 25-60 degrees, and the inclination angle of the second pole lug is 120-155 degrees.

The inclination modes of the two tabs are three, which are respectively as follows: all incline to the right, all incline to the left or incline inwards, the inclination inwards is the inclination that two utmost point ears are respectively close to each other, and the inward incline needs to make anti-short circuit measure in the production process, for example overlaps the pyrocondensation pipe on the utmost point ear.

As a further improvement of the above technical solution, the housing is provided with an encapsulation surface, the first extension portion and the second extension portion both extend out of the encapsulation surface, and the first tab and the second tab are both inclined with the encapsulation surface. The first tab is connected with a first packaging piece, and the angle difference between the first packaging piece and the packaging surface is 0-5 degrees. The second lug is connected with a second packaging piece, and the angle difference between the second packaging piece and the packaging surface is 0-5 degrees. The structure can effectively ensure that the first packaging piece is parallel to the packaging surface at the top of the electrochemical device so as to improve the packaging effect; the second package is the same.

As a further improvement of the above technical solution, along the second direction, the first package protrudes out of both ends of the first tab, and the protruding length is greater than or equal to 1.7 mm; and/or the second packaging part protrudes out of two ends of the second pole lug along the second direction, and the protruding length is greater than or equal to 1.7 mm. The first packaging piece is arranged to protrude out of two ends of the first electrode lug by 1.7 millimeters, so that the packaging effect of the first packaging piece can be further improved.

As a further improvement of the above technical solution, in a state where the first extending portion is bent, the first extending portion protrudes from the first side surface. And under the state that the second extension part is bent, the second extension part protrudes out of the second side surface. The extension portions protrude the sides to increase the connection area between the tabs, thereby facilitating the connection of a plurality of electrochemical devices into a group.

According to some embodiments of the present application, in a second aspect, the present application also provides a battery module including an electrochemical device as described in any one of the above. The plurality of electrochemical devices are sequentially stacked in a third direction, and the first extension portion of one electrochemical device and the second extension portion of another electrochemical device in two adjacent electrochemical devices are connected.

According to some embodiments of the present application, in a second aspect, the present application also provides an electronic device including the battery module according to the above embodiments.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

[ description of the drawings ]

One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.

Fig. 1 is a schematic packaging diagram of a prior art cell;

FIG. 2 is a schematic diagram of a prior art cell structure;

FIG. 3 is a schematic diagram of a prior art cell grouping;

FIG. 4 is a schematic diagram of a prior art cell grouping;

FIG. 5 is a schematic structural view of an electrochemical device according to some embodiments of the present application;

FIG. 6 is a side view of an electrochemical device according to some embodiments of the present application;

FIG. 7 is a top view of an electrochemical device according to some embodiments of the present application;

FIG. 8 is a schematic winding of a pole piece according to some embodiments of the present application;

fig. 9 is a schematic structural view of a battery module according to some embodiments of the present application;

FIG. 10 is a schematic illustration of a lamination of a first pole piece and a second pole piece according to some embodiments of the present application;

fig. 11 is a schematic view of a sub-tab to tab connection according to some embodiments of the present application;

FIG. 12a is a schematic structural diagram of an electrochemical device according to some embodiments of the present application;

FIG. 12b is a schematic structural view of an electrochemical device according to some embodiments of the present application;

FIG. 12c is a schematic structural view of an electrochemical device according to some embodiments of the present application;

fig. 13 is a schematic view of a tab of some embodiments of the present application being bent;

fig. 14 is a schematic view of a first tab according to some embodiments of the present application;

fig. 15 is a schematic view of the connection of a first pole piece to a first tab according to some embodiments of the present application.

In the figure:

100. a single battery;

1. a naked battery cell;

2. a housing; 2a, shallow pits; 2b, deep pit; 2c, shallow pit surface; 2d, deep pit surface;

3. a tab; 3a, a positive electrode lug; 3b, a negative pole tab;

4. a connection area; 5. thick foam; 6. thin foam;

200. an electrochemical device;

10. a housing; 11. a first side surface; 12. a second side surface; 13. packaging the surface;

20. an electrode assembly; 21. a first pole piece; 21a, a current collector; 21a1, void area; 21b, an active material layer; 211. a first sub-tab; 22. a second pole piece; 221. a second sub-tab; 23. an isolation film;

30. a first tab; 31. a first connection portion; 32. a first extension portion; 321. a first long side; 322. a first short side; 33. a first package;

40. a second tab; 41. a second connecting portion; 42. a second extension portion; 43. a second package;

1000. a battery module is provided.

[ detailed description ] embodiments

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 is noted that when an element is referred to as being "secured to"/"mounted 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," "upper," "lower," "left," "right," "inner," "outer," and the like as used herein are 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" 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 present application described below may be combined with each other as long as they do not conflict with each other.

In this specification, the term "mount" includes welding, screwing, clipping, adhering, etc. to fix or restrict a certain element or device to a specific position or place, the element or device may be fixed or movable in a limited range in the specific position or place, and the element or device may be dismounted or not dismounted after being fixed or restricted to the specific position or place, which is not limited in the embodiment of the present application.

Fig. 1 to 4 are prior art drawings, and the prior art will be described with reference to the drawings. Referring to fig. 1, fig. 1 shows a schematic packaging diagram of a single battery 100, where the single battery 100 includes a bare cell 1, a casing 2, and a tab 3, the tab 3 is connected to the bare cell 1, and the casing 2 is used to accommodate the bare cell 1. Before the single battery 100 is packaged, the shell 2 needs to be subjected to a pit punching operation to cover the bare cell 1. To the great naked electric core 1 of thickness, need carry out two sides to shell 2 usually and dash the hole, the left side of shell 2 is dashed and is equipped with shallow pit 2a in fig. 1, and the right side is dashed and is equipped with deep pit 2 b. During packaging, the naked electric core 1 can be placed in the deep pit 2b, and the left shallow pit surface 2c is turned over and hot-pressed to package so as to coat the naked electric core 1. For a bare cell 1 with a relatively thin thickness, only one side is required to be punched with a pit, the other side is a plane, the side which is punched with the pit is called a deep pit surface 2d, and the side which is not punched with the pit is called a shallow pit surface 2 c.

Fig. 2 shows the packaged unit cell 100, in which the tab 3 protrudes from the outer surface of the case 2, and the tab 3 is used as a boundary, and the outer surface of the shallow pit 2a is located above the tab 3 and is referred to as a shallow pit surface 2c, and the outer surface of the deep pit 2b is located below the tab 3 and is referred to as a deep pit surface 2 d. It can be seen that the distance from the shallow pit surface 2c to the tab 3 is significantly smaller than the distance from the deep pit surface 2d to the tab 3.

Fig. 3 shows a schematic diagram of a group formed by combining the single batteries 100, the multiple single batteries 100 are sequentially stacked, a positive electrode tab 3a of one single battery 100 needs to be connected with a negative electrode tab 3b of another single battery 100, and the inventors of the present application have noticed that, in the multiple single batteries 100, a shallow pit surface 2c of one single battery 100 needs to correspond to a shallow pit surface 2c of another single battery 100, and since the distance from the shallow pit surface 2c to the electrode tab 3 is short, when the positive electrode tab 3a and the negative electrode tab 3b are connected by two adjacent single batteries 100, the connection area 4 is insufficient (the connection area 4 is a rounded rectangular portion in fig. 3), which easily causes a short circuit of the battery module 1000.

In order to ensure that the tab 3 of each of the two unit batteries 100 has a sufficient connection area 4, as shown in fig. 4, thick foam 5 may be disposed between the shallow pit surfaces 2c of the two adjacent unit batteries 100, the foam is thickened to reduce the energy density of the battery module 1000, and thin foam 6 is disposed between the two opposite deep pit surfaces 2d, which increases the types of foam, makes the manufacturing process complicated, and increases the production cost.

In order to alleviate the above problems, in a first aspect, an embodiment of the present application provides an electrochemical device 200, and referring to fig. 5 to 7 together, the electrochemical device 200 includes a case 10, an electrode assembly 20, a first tab 30, and a second tab 40. The electrode assembly 20 is received in the case 10, the first tab 30 and the second tab 40 are connected to the electrode assembly 20 and extend out of the case 10, and the first tab 30 and the second tab 40 are inclined with respect to the first direction and the second direction. The housing 10 includes a first side surface 11 and a second side surface 12 opposite to each other in the third direction, and the protruding portion of the first tab 30 is adapted to be bent toward the first side surface 11, and the protruding portion of the second tab 40 is adapted to be bent toward the second side surface 12. Wherein the first direction is a Z direction in fig. 5 and 6, i.e., a length direction of the electrochemical device 200; the second direction is the X direction in fig. 5 and 7, i.e., the width direction of the electrochemical device 200; the third direction is the Y direction in fig. 6 and 7, i.e., the thickness direction of the electrochemical device 200, and the first direction, the second direction and the third direction are perpendicular to each other in pairs, and the following embodiments are also applicable. It should be noted that, in the embodiment of the present application, the electrochemical device 200 is the smallest unit constituting the battery or the battery module 1000, and is a place where the conversion between the electrical energy and the chemical energy is specifically realized.

Referring to fig. 5 to 7, the casing 10 has a substantially flat rectangular parallelepiped shape, and a housing cavity (not shown) is formed inside the casing 10 for housing the electrode assembly 20 and the electrolyte. The housing 10 includes a first side 11 and a second side 12 opposite to each other in the third direction, and one of the two sides (11, 12) is a deep pit 2d and the other is a shallow pit 2 c. In this embodiment, the electrochemical device 200 is a flexible package battery, and the housing 10 is an aluminum-plastic film, in other embodiments, the electrochemical device 200 can also be a hard-shell battery, and correspondingly, the housing 10 is a metal shell.

Referring to fig. 5 and 8, the electrode assembly 20 is accommodated in the accommodating cavity of the case 10, and the electrode assembly 20 includes a first pole piece 21, a second pole piece 22 and a separation film 23. The first pole piece 21 and the second pole piece 22 have opposite polarities and are arranged at intervals, one of the two is a positive pole piece, and the other is a negative pole piece. The separator 23 is disposed between the first pole piece 21 and the second pole piece 22 to separate the two. In the present embodiment, the electrode assembly 20 is a winding structure, and specifically, the first pole piece 21, the first isolation film 23, the second pole piece 22 and the second isolation film 23 are stacked and wound into a cylindrical structure with a rectangular cross section with rounded corners so as to be accommodated in the accommodating cavity. In other embodiments, the electrode assembly 20 may also be a stacked structure.

Referring to fig. 5, the first tab 30 has a first connection portion 31 and a first extension portion 32, the first connection portion 31 is disposed in the receiving cavity of the housing 10 and connected to the electrode assembly 20, and specifically, the first connection portion 31 is connected to the first pole piece 21 of the electrode assembly 20; the first extension 32 extends out of the housing 10. The tab is a metal conductor that leads the positive and negative electrodes from the electrochemical device 200, and the tab of the electrochemical device 200 is a contact point during charging and discharging. The first extension portion 32 is linearly extended from the first connection portion 31 such that the first tab 30 is linearly formed as a whole, and the first tab 30 is obliquely disposed with respect to the first and second directions.

Referring to fig. 5, the second tab 40 is the same as the first tab 30, the second tab 40 has a second connection portion 41 and a second extension portion 42, the second connection portion 41 is disposed in the receiving cavity of the case 10 and is connected to the electrode assembly 20, and specifically, the second connection portion 41 is connected to the second tab 22 of the electrode assembly 20; the second extension 42 extends out of the housing 10. The second extension portion 42 is linearly extended from the second connection portion 41 such that the second tab 40 is also linearly formed as a whole, and the second tab 40 is obliquely disposed with respect to the first and second directions.

Referring to fig. 7, the first extending portion 32 is used for bending toward the first side surface 11, and in a state where the first extending portion 32 is bent, the first extending portion 32 protrudes from the first side surface 11; the second extending portion 42 is used for bending toward the second side surface 12, and in a state where the second extending portion 42 is bent, the second extending portion 42 protrudes from the second side surface 12, in this embodiment, the first side surface 11 is a deep pit surface 2d, and the second side surface 12 is a shallow pit surface 2 c.

Referring to fig. 9, a structure of a plurality of electrochemical devices 200 connected in a group is shown, the plurality of electrochemical devices 200 are sequentially stacked in a third direction, in this embodiment, since the first tab 30 and the second tab 40 are both disposed in an inclined manner with respect to the first direction and the second direction, when the first extension portion 32 of each electrochemical device 200 is bent toward the first side surface 11 and the second extension portion 42 is bent toward the second side surface 12, the first extension portion 32 can be directly connected to the second extension portion 42 of another electrochemical device 200 in an inclined manner in the third direction, and therefore, when the electrochemical devices 200 are connected in a group, two adjacent electrochemical devices 200 can adopt a connection manner of the deep pit surface 2d to the shallow pit surface 2 c. The connection mode of deep pit surface 2d to shallow pit surface 2c has guaranteed to have sufficient interval between two electrochemical device 200, and the extension of two electrochemical device 200 connects in the third direction slope simultaneously, can further increase the area of connection 4 of utmost point ear to reduce the short circuit risk. Because each electrochemical device 200 adopts the connection mode of the deep pit surface 2d to the shallow pit surface 2c, the intervals between the electrochemical devices 200 are the same, and therefore, the buffer parts with the same thickness specification can be arranged between every two adjacent electrochemical devices 200, the manufacturing process is simplified, and the production cost is reduced; wherein, the bolster is the foam or other flexible component that have buffer function. In addition, in the embodiment of the present application, the first extension portion 32 is linearly extended from the first connection portion 31, and the second extension portion 42 is linearly extended from the second connection portion 41, so that the first tab 30 and the second tab 40 are both linear, and the linear tab can be produced in a roll material form, which is easy to produce and manufacture, and does not need to redevelop a new special-shaped tab, so as to further reduce the production cost and effectively improve the production efficiency.

As for the first pole piece 21 and the second pole piece 22, in one embodiment, please refer to fig. 10 and 11, and fig. 10 shows a laminated structure of the first pole piece 21 and the second pole piece 22. The first pole piece 21 is provided with a first sub-pole lug 211, the second pole piece 22 is provided with a second sub-pole lug 221, the first pole piece 21 and the second pole piece 22 can both adopt a die cutting process to die cut the sub-pole lugs, the die cutting process is a sub-pole lug forming process before the two pole pieces (21 and 22) are wound, after the winding is finished, the first pole lug 30 is connected to the first sub-pole lug 211, and the second pole lug 40 is connected to the second sub-pole lug 221. For the pole piece provided with a plurality of sub-pole lugs, the sub-pole lugs are overlapped after the pole piece is wound so as to facilitate the connection of the pole lugs and the sub-pole lugs. In the embodiment, the tab and the sub-tab can be welded together through a transfer welding process so as to ensure that the set currents of the two tabs (30 and 40) are respectively conducted on the sub-tabs of the two pole pieces (21 and 22). The first sub-tab 211 and the second sub-tab 221 are both arranged obliquely relative to the first direction and the second direction, after the first pole piece 21 and the second pole piece 22 are stacked or wound, the oblique direction of the first sub-tab 211 is consistent with that of the first tab 30, and the oblique direction of the second sub-tab 221 is consistent with that of the first tab 30. In the present embodiment, the consistent inclination direction means an inclination angle difference of 0 to 5 degrees, and the following embodiments are also applicable.

For the height of the sub-tab, please refer to fig. 10, the height of the sub-tab is the vertical distance from the sub-tab to the pole piece, i.e. the vertical height H of the sub-tab along the Z direction in fig. 10. The height of the sub-tab is related to the thickness of the electrode assembly 20, and generally, the height of the sub-tab is 8 to 20 mm, so that the vertical height of the first sub-tab 211 is 8 to 20 mm in the first direction in the present embodiment; and/or the vertical height of the second sub-tab 221 along the first direction is 8-20 mm.

Referring to fig. 12a to 12c together, regarding the inclination angles of the first tab 30 and the second tab 40, there are three inclination manners of the two tabs (30, 40), which are respectively: the tabs are inclined rightwards, leftwards or inwards, the inwards inclination is the inclination that the two tabs (30 and 40) are respectively close to each other, and the inwards inclination needs to be taken as a short-circuit prevention measure in the production process, for example, heat shrink tubes are sleeved on the tabs. Taking a right inclination as an example, the inclination angle a of the tab may be selected from 0 to 90 degrees, and considering that the center distance of the tab (the distance between the first tab 30 and the second tab 40 in a single electrochemical device 200) is 15 to 30 mm and the thickness of the electrochemical device 200 is 5 to 10 mm, the thickness of the buffer member is matched, the inclination angle a of the tab along the second direction may be calculated to be 25 to 60 degrees. Therefore, in the present embodiment, taking the second direction as an example, the inclination angle of the first tab 30 and the inclination angle of the second tab 40 are both 25 to 60 degrees, i.e. the first tab is inclined to the right in fig. 12 a; or, the inclination angle of the first tab 30 and the inclination angle of the second tab 40 are both 120-155 degrees, i.e. they incline to the left in fig. 12 b; alternatively, the inclination angle of the first tab 30 is 25 to 60 degrees, and the inclination angle of the second tab 40 is 120 to 155 degrees, i.e., inward inclination in fig. 12 c. When the tabs are all inclined to the left or right, as shown in fig. 13, the second tab 40 may be bent toward the first side surface 11 and then toward the second side surface 12.

Referring to fig. 14, the first extending portion 32 has a first long side 321 and a first short side 322 along the extending direction of the first extending portion 32, and the length of the first long side 321 is greater than the length of the first short side 322 along the extending direction of the first extending portion 32. The length of the first long side 321 can be determined based on the tab center distance and the thickness of the electrochemical device 200, and the larger the tab center distance and the thickness of the electrochemical device 200 are, the longer the length of the first long side 321 is, and in general, the length of the first long side 321 is 10 to 40 mm, preferably 15 to 25 mm. Based on the same inventive concept, the second extending portion 42 has a second long side (not shown) and a second short side (not shown) in the extending direction, the length of the second long side is greater than that of the second short side, and the length of the second long side can also be 10-40 mm, preferably 15-25 mm.

In one embodiment, referring to fig. 11 and 13, the first tab 30 is connected to a first encapsulation 33, the second tab 40 is connected to a second encapsulation 43, the tab is generally formed by combining two parts of an encapsulation and a metal band, the encapsulation may be a film, the film is an insulation part on the tab, and the film is used for preventing short circuit between the metal band and the casing 10 when the electrochemical device 200 is encapsulated, and is hot-melt sealed and bonded with the casing 10 by heating to prevent liquid leakage when the electrochemical device is encapsulated. The shell 10 is provided with a packaging surface 13, the first extending portion 32 and the second extending portion 42 both extend out of the packaging surface 13 of the shell 10, and the first tab 30 and the second tab 40 are both arranged obliquely with respect to the packaging surface 13. In general, the packaging surface 13 of the casing 10 is parallel to the second direction, a first preset angle b is formed between the first package 33 and the first tab 30, and an included angle between the first tab 30 and the second direction may be set to be consistent with the first preset angle b, that is, the included angle between the first tab 30 and the packaging surface 13 is consistent with the first preset angle b, so that the first package 33 and the packaging surface 13 on the top of the electrochemical device 200 can be effectively ensured to be parallel to improve the packaging effect; the second package 43 is similar.

In one embodiment, to further improve the packaging effect of the first packaging member 33, as shown in fig. 14, the first packaging member 33 protrudes from both ends of the first tab 30 along the second direction, and the protruding length may be set to be greater than 1.7 mm, that is, the shoulder width K of the first packaging member 33 at both left and right ends of the first tab 30 needs to be greater than 1.7 mm, and preferably 2.5-4 mm. Based on the same inventive concept, the second encapsulation 43 protrudes from both ends of the second tab 40 along the second direction, and the protruding length may be set to be greater than 1.7 mm, preferably 2.5-4 mm. In other embodiments, the left and right sides of the first package member 33 may be disposed parallel to the first tab 30, and the left and right sides of the second package member 43 may be disposed parallel to the second tab 40.

In an embodiment, the first pole piece 21 and the second pole piece 22 are not provided with a sub-tab, taking the first pole piece 21 as an example, as shown in fig. 15, the first pole piece 21 includes a current collector 21a and an active material layer 21b coated on the current collector 21a, since the first pole piece 21 is not provided with a sub-tab, the first tab 30 needs to be directly connected with the current collector 21a, so when connecting, a void area 21a1 needs to be provided on the current collector 21a, and the void area 21a1 is an area of the current collector 21a in fig. 15 where the active material layer 21b is not coated. The first tab 30 is then directly connected to the void area 21a1 of the current collector 21 a. To ensure a larger welding area between the first tab 30 and the current collector 21a, the void area 21a1 may also be inclined in the same direction as the first tab 30 to ensure that the first tab 30 is not welded with the active material layer 21 b.

According to some embodiments of the present application, in a second aspect, the present application also provides a battery module 1000, wherein the battery module 1000 comprises the electrochemical device 200 according to any one of the above embodiments. As shown in fig. 9, a plurality of electrochemical devices 200 are sequentially stacked in a third direction, and the first extension portion 32 of one electrochemical device 200 and the second extension portion 42 of another electrochemical device 200 of two adjacent electrochemical devices 200 are connected.

Two adjacent electrochemical devices 200 have adopted the deep pitted surface 2d to the connected mode of shallow pitted surface 2c, have guaranteed to have sufficient interval between two electrochemical devices 200, and the extension of two electrochemical devices 200 connects in the third direction slope simultaneously, can further increase the connection area 4 of utmost point ear to reduce the short circuit risk. Since each electrochemical device 200 adopts the connection manner of the deep pit surface 2d to the shallow pit surface 2c, the distances between the electrochemical devices 200 are the same, and therefore, the buffer member with the same thickness specification can be arranged between each two adjacent electrochemical devices 200, so as to simplify the manufacturing process and reduce the production cost. In addition, in the embodiment of the present application, the first extension portion 32 is linearly extended from the first connection portion 31, and the second extension portion 42 is linearly extended from the second connection portion 41, so that the first tab 30 and the second tab 40 are both linear, and the linear tab can be produced in a roll material form, which is easy to produce and manufacture, and does not need to redevelop a new special-shaped tab, so as to further reduce the production cost and effectively improve the production efficiency.

According to some embodiments of the present application, in a third aspect, the present application also provides an electronic device including the battery module 1000 according to the above embodiment or the electrochemical device 200 according to any of the above embodiments.

The electrochemical device 200 and the battery module 1000 disclosed in the embodiment of the present application may be used in electronic devices such as vehicles, ships, or aircrafts, but not limited thereto. The power supply system having the electrochemical device 200, the battery module 1000, and the like disclosed in the present application may be used to constitute the electronic apparatus, which is advantageous in reducing costs and reducing the risk of short circuits.

The embodiment of the present application provides an electronic device using an electrochemical device 200 or a battery module 1000 as a power source, and the electronic device may be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrochemical device comprises a shell, a first tab and a second tab, wherein the first tab is provided with a first connecting part and a first extending part, the second tab is provided with a second connecting part and a second extending part, the first connecting part and the second connecting part are both arranged in the shell, the first extending part and the second extending part both extend out of the shell,

the first extension part extends linearly from the first connecting part, the second extension part extends linearly from the second connecting part, and the first lug and the second lug are both obliquely arranged relative to a first direction and a second direction;

the shell comprises a first side surface and a second side surface which are oppositely arranged in a third direction, the first extending part is used for bending towards the direction of the first side surface, and the second extending part is used for bending towards the direction of the second side surface;

the first direction, the second direction and the third direction are mutually vertical pairwise.

2. The electrochemical device according to claim 1, further comprising an electrode assembly having a first pole piece and a second pole piece, the first pole piece and the second pole piece being sequentially laminated or wound;

the first pole piece is provided with a first sub-pole lug, the first pole lug is connected to the first sub-pole lug, and the inclination direction of the first sub-pole lug is consistent with that of the first pole lug connected with the first pole lug;

the second pole piece is provided with a second sub-pole lug, the second pole lug is connected with the second sub-pole lug, and the inclination direction of the second sub-pole lug is consistent with the inclination direction of the first pole lug connected with the second sub-pole lug.

3. The electrochemical device according to claim 2, wherein a vertical height of the first sub-tab along the first direction is 8 to 20 mm; and/or the presence of a gas in the gas,

along the first direction, the vertical height of the second sub-tab is 8-20 mm.

4. The electrochemical device according to claim 1, wherein the first extension portion has a first long side and a first short side along an extension direction thereof, a length of the first long side is greater than a length of the first short side along the extension direction of the first extension portion, and the length of the first long side is 10-40 mm; and/or the presence of a gas in the gas,

the second extension has along its extending direction's second long limit and second minor face, follows the extending direction of second extension, the length on second long limit is greater than the length of second minor face, the length on second long limit is 10 ~ 40 millimeters.

5. The electrochemical device according to any one of claims 1 to 4, wherein in the second direction, the inclination angle of the first tab and the inclination angle of the second tab satisfy any one of the following conditions:

(c) the inclination angle of the first tab is 25-60 degrees, and the inclination angle of the second tab is 120-155 degrees.

6. The electrochemical device as claimed in claim 5, wherein the housing has an encapsulation surface, the first extension portion and the second extension portion both extend out of the encapsulation surface, and the first tab and the second tab are both disposed obliquely to the encapsulation surface;

the first tab is connected with a first packaging piece, and the angle difference between the first packaging piece and the packaging surface is 0-5 degrees;

the second lug is connected with a second packaging piece, and the angle difference between the second packaging piece and the packaging surface is 0-5 degrees.

7. The electrochemical device as claimed in claim 6, wherein the first encapsulation protrudes from both ends of the first tab along the second direction by a length greater than or equal to 1.7 mm; and/or the presence of a gas in the atmosphere,

and along the second direction, the second packaging part protrudes out of two ends of the second pole lug, and the protruding length is greater than or equal to 1.7 mm.

8. The electrochemical device as claimed in claim 1, wherein the first extension protrudes from the first side surface in a state where the first extension is bent;

and under the state that the second extension part is bent, the second extension part protrudes out of the second side surface.

9. A battery module comprising the electrochemical device according to any one of claims 1 to 8;

the plurality of electrochemical devices are sequentially stacked in the third direction, and the first extension portion of one electrochemical device and the second extension portion of another electrochemical device in adjacent two of the electrochemical devices are connected.

10. An electronic device characterized by comprising the battery module according to claim 9.