CN113611986A - Battery cell, battery and electronic equipment - Google Patents
Battery cell, battery and electronic equipment Download PDFInfo
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- CN113611986A CN113611986A CN202110872499.5A CN202110872499A CN113611986A CN 113611986 A CN113611986 A CN 113611986A CN 202110872499 A CN202110872499 A CN 202110872499A CN 113611986 A CN113611986 A CN 113611986A
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- tab
- battery
- bent
- packaging
- bending
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application discloses electric core, battery and electronic equipment. The tab glue comprises an exposed part extending out of the packaging part, the exposed part is provided with a space avoiding area, and the space avoiding area forms an easy folding line perpendicular to the extending direction of the tab on the tab glue. Keep away the district and can reduce the degree of difficulty of buckling that utmost point ear glued, the kink length in electric core length direction after buckling can reduce, is favorable to reducing the encapsulation space of electric core and promotes the capacity of electric core and battery.
Description
Technical Field
The application relates to the technical field of electrochemistry, in particular to an electric core, a battery and electronic equipment.
Background
With the vigorous development of electrochemical technology, people have higher and higher requirements for improving the capacity of batteries. In order to increase the battery capacity, manufacturers usually optimize the head space of the battery, and among them, the flip-top battery is a battery which is popular at present. In the folded top-sealed battery, the packaging part of the battery is bent and fixed to one end face of the battery, correspondingly, the tab of the battery is also bent so as to be electrically connected to the circuit board, however, tab glue is arranged between the tab and the packaging part, in order to ensure the sealing effect of the packaging part at the extending position of the tab and avoid the contact of the tab and the exposed aluminum layer of the packaging part, the tab glue generally protrudes from the packaging part by a certain length and is limited by the existing production process level, the length of the tab glue protruding out of the packaging part is often more than 1mm, and the tab glue is difficult to bend due to higher hardness, and the length occupied in the length direction of the battery after bending is also larger, so that the space waste in the length direction of the battery is caused, and the reduction of the packaging space of a battery core and the improvement of the battery capacity are not facilitated.
Disclosure of Invention
To the above problem, embodiments of the present application provide an electric core, a battery, and an electronic device, which improve the bending difficulty of tab glue and reduce the length occupied in the length direction of the battery after bending.
In a first aspect, an embodiment of the present application provides an electrical core, including: wrapping bag, electrode subassembly, utmost point ear, and utmost point ear glue. The packaging bag comprises a main body part and a packaging part, wherein the packaging part extends out of a first end face of the main body part; the electrode assembly is accommodated in the main body part; one end of the tab is electrically connected to the electrode assembly, and the other end of the tab extends out of the packaging part; the tab glue is positioned between the tab and the packaging part; the tab glue comprises an exposed part extending out of the packaging part, and the exposed part is provided with a space avoiding area. Keep away the district and can reduce the degree of difficulty of buckling that utmost point ear glued, the length in the electric core length direction after the kink is buckled can reduce, is favorable to promoting electric core capacity.
In some embodiments, the exposed portion includes a first sub-portion and a second portion oppositely disposed along the extending direction of the tab, and the void-avoiding region is disposed between the first portion and the second portion. The second part can increase the area of the tab covered by tab glue, reduce the exposed part of the tab and be beneficial to protecting the tab.
In some embodiments, the clearance areas are continuously distributed on the exposed part and perpendicular to the extending direction of the lug. Keep away the dead zone continuous distribution between first kink and second kink, can regard for keeping away the dead zone and run through the kink along the third direction, be favorable to reducing the preparation degree of difficulty of keeping away the dead zone.
In some embodiments, the clearance areas are distributed on the exposed part at intervals perpendicular to the extending direction of the tab. The first part and the second part are still connected but not disconnected, so that the structural strength of the exposed part is improved, and the tabs are protected; in addition, after the bending, the risk of electric contact between the tab and the circuit board and between the tab and the aluminum plastic film of the cut of the packaging part can be reduced, and the safety risk caused by short circuit is reduced.
In some embodiments, the exposed portion includes a first portion and a second portion oppositely disposed along the extending direction of the tab; along a direction perpendicular to the polesThe ear extension direction, on at least one side of the tab, the length of the first portion is less than the length of the second portion. The risk that burrs and the like at the broken opening (namely the edge of the clearance area) of the bent exposed part pierce the packaging adhesive paper can be reduced. Optionally, the difference between the lengths of the second part and the first part is D along at least one side of the tab along the direction perpendicular to the extension direction of the tab0And 0.5mm < D0≤3.0mm。
In some embodiments, the clearance area is disposed on one side of the exposed portion located on the tab. Namely, on one side of utmost point ear, utmost point ear glue is provided with keeps away the dead zone, and on the opposite side of utmost point ear, utmost point ear glue does not set up and keeps away the dead zone, not only can reduce utmost point ear gluey the degree of difficulty of buckling, moreover, keeps away the dead zone and sets up when the kink is carried away from one side of encapsulation portion, after buckling, and utmost point ear glue towards encapsulation portion can reduce utmost point ear and circuit board and encapsulation portion and cut out notched plastic-aluminum membrane electrical contact's risk, reduces the safe risk that the short circuit leads to.
In a second aspect, an embodiment of the present application provides a battery cell, including: wrapping bag, electrode subassembly, utmost point ear and utmost point ear glue, circuit board. The packaging bag comprises a main body part and a packaging part, wherein the packaging part extends out of a first end face of the main body part, and is bent and fixed to the first end face; the electrode assembly is accommodated in the main body part; one end of the tab is electrically connected to the electrode assembly, and the other end of the tab extends out of the packaging part; the circuit board is arranged on one side of the packaging part back to the electrode assembly and is electrically connected with the electrode lugs of the battery cell; the tab glue is positioned between the tab and the packaging part; the tab glue comprises an exposed part extending out of the packaging part, the exposed part comprises a first sub part and a bent part, the first sub part is connected with the packaging part and extends along a first direction, the bent part is connected with the first sub part, and the bent part is provided with a space avoiding area. Keep away the district and can reduce the degree of difficulty of buckling that utmost point ear glued, the length in the electric core length direction after the kink is buckled can reduce, is favorable to promoting electric core capacity.
In some embodiments, the exposed portion further includes a second portion disposed opposite to the first portion along a second direction perpendicular to the first direction, one end of the bent portion is connected to the first portion, and the other end of the bent portion is connected to the second portion. The second part can increase the area of the tab covered by tab glue, reduce the exposed part of the tab and be beneficial to protecting the tab.
In some embodiments, the bending portion includes a first bending portion and a second bending portion oppositely disposed along the second direction, and the void-avoiding region is disposed between the first bending portion and the second bending portion.
In some embodiments, the keep-away area is continuously distributed along a third direction at the bending portion, and the third direction is perpendicular to the first direction and the second direction. Keep away the dead zone continuous distribution between first kink and second kink, can regard for keeping away the dead zone and run through the kink along the third direction, be favorable to reducing the preparation degree of difficulty of keeping away the dead zone.
In some embodiments, the keep-out areas are spaced apart on the bend along a third direction, the third direction being perpendicular to the first direction and the second direction. The first bending part and the second bending part are still connected and not disconnected, so that the structural strength of the bending parts is improved, the tabs are protected, the risk that burrs and the like of the first bending part and the second bending part at a fracture (namely, the edge of a clearance area) pierce the packaging adhesive tape is reduced, and the packaging adhesive tape is used for packaging and protecting the head structure of the battery cell so as to electrically insulate the head structure from the outside and the like.
In some embodiments, the bending part includes a first bending part and a second bending part oppositely arranged along the second direction; and along a third direction, at least one side of the tab, the length of the first bending part is smaller than that of the second bending part, and the third direction is perpendicular to the first direction and the second direction. The risk that burrs and the like of the first bending part at the fracture (namely the edge of the clearance area) pierce the packaging adhesive tape is reduced. Optionally, along a third direction, on either side of the tab, a difference between lengths of the second bending part and the first bending part is D0And 0.5mm < D0≤3.0mm。
In some embodiments, the keep-out zone has a length D along the second direction1And 0 < D1Less than or equal to 0.4 mm. Through controlling the length of the space avoiding area in the second direction, the distance between the first bending part and the second bending part is smaller, and the risk that burrs and the like on the edge of the space avoiding area pierce the packaging adhesive tape is reduced.
In some embodiments, the length of the first bending part along the second direction is D2And D is not more than 0.2mm2Less than or equal to 1.0 mm. The risk that burrs and the like of the first bending part at the fracture part puncture the packaging adhesive tape is reduced.
In some embodiments, the length of the bent portion along the first direction is D3And D is not more than 0.1mm3Less than or equal to 0.5mm, reduce the length of kink in electric core thickness direction, be favorable to reducing electric core thickness.
In some embodiments, the radius of curvature of the first bend is R1The radius of curvature of the second bending part is R2And R is not less than 0.1mm1≤0.5mm，0.1mm≤R2≤0.5mm。
In some embodiments, one side of kink dorsad encapsulation portion is provided with keeps away the dead zone, namely, in one side of utmost point ear, utmost point ear glue is provided with keeps away the dead zone, and in the opposite side of utmost point ear, utmost point ear glue does not set up keeps away the dead zone, not only can reduce the degree of difficulty of buckling that utmost point ear glued, and utmost point ear glue towards encapsulation portion can reduce the utmost point ear and circuit board and encapsulation portion and cut out notched plastic-aluminum membrane electrical contact's risk, reduces the safe risk that the short circuit leads to moreover.
In some embodiments, the length of the tab glue facing the packaging part side along the second direction is D4And 0.5mm < D42.5mm or less, and the length of the lug glue on one side of the packaging part towards the lug is increased in the second direction, so that the risk of the lug electrically contacting the circuit board and the aluminum plastic film of the cutting notch of the packaging part is reduced.
In a third aspect, an embodiment of the present application provides an electronic device, including a load, and the battery cell or the battery of any of the above embodiments, where the battery cell or the battery is used to supply power to the load.
As above, electric core, battery and electronic equipment of this application embodiment, the kink that utmost point ear glued is provided with keeps away the dead zone, keeps away the dead zone and can reduce the degree of difficulty of buckling that utmost point ear glued, and the kink length on electric core length direction after buckling can reduce, is favorable to reducing the encapsulation space of electric core and promotes electric core capacity.
Drawings
Fig. 1 is a schematic structural diagram of a battery cell according to a first embodiment of the present application;
fig. 2 is an enlarged view of the structure of region i of the cell shown in fig. 1;
fig. 3 is a schematic structural view of the battery cell shown in fig. 1 when the tab glue is not laser-cut;
fig. 4 is a schematic view of the battery cell shown in fig. 1 electrically connected to a circuit board and bending tab glue;
fig. 5 is an enlarged view of the structure of region ii of the battery shown in fig. 4;
fig. 6 is a schematic view of the battery shown in fig. 4, viewed in a first direction;
fig. 7 is a schematic view illustrating a scene of laser cutting tab glue according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a battery cell according to a second embodiment of the present application;
fig. 9 is an enlarged view of the structure of region iii of the cell shown in fig. 8;
fig. 10 is a schematic structural diagram of a battery cell according to a third embodiment of the present application;
fig. 11 is an enlarged view of a structure of a region iv of the cell shown in fig. 10;
fig. 12 is a schematic structural view of a battery cell according to a fourth embodiment of the present application, viewed in a direction opposite to a first direction;
fig. 13 is an enlarged view of the structure of a region v of the cell shown in fig. 12;
fig. 14 is a schematic structural view of a battery cell according to a fourth embodiment of the present application, viewed in a first direction;
fig. 15 is an enlarged view of the structure of region vi of the cell shown in fig. 14;
fig. 16 is a schematic view of the cell shown in fig. 12 electrically connected to a circuit board and bending tab glue;
fig. 17 is an enlarged view of the structure of region vii of the cell shown in fig. 16.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described below in detail with reference to specific embodiments and accompanying drawings. It should be apparent that the embodiments described below are only some embodiments of the present application, and not all embodiments. In the following embodiments and technical features thereof, all of which are described below may be combined with each other without conflict, and also belong to the technical solutions of the present application.
First embodiment
Referring to fig. 1 to 6, the battery cell 10 of the present embodiment includes a packaging bag 11, an electrode assembly (not shown), a tab 13, and a tab glue 14.
The packaging bag 11 is enclosed to form the shape of the battery cell 10, and may also be used to define the appearance of the battery cell 10, for example, the packaging bag 11 includes a packaging part 11a and a main body part 11b, the electrode assembly is disposed in the main body part 11b, and the packaging part 11a and the tab 13 extend from a first end face of the main body part 11 b. The first end surface of the main body portion 11b may be regarded as the first end surface 10a of the battery cell 10, and is described below as an example. The body portion 11b forms a housing cavity, and internal components (for example, an electrode assembly and an electrolyte) of the battery cell 10 are housed in the housing cavity, and the internal components are protected by the packaging bag 11, thereby improving a protection effect and safety.
The sealing portion 11a is provided on the first end face 10a of the main body portion 11b to seal the packaging bag 11 and prevent leakage of the electrolyte from the first end face 10a and entry of impurities such as water and oxygen outside the packaging bag 11 into the packaging bag 11 from the first end face 10 a. The sealing portion 11a also seals the protruding region of the tab 13, and is used to seal the joint of the packaging bag 11 and the tab 13.
The other end surface of the main body 11b may extend out of the sealing portion 11a, for example, in the scenes shown in fig. 1 and 3, the sealing portion 11a extends from all three end surfaces of the main body 11b, and the sealing portion 11a located at the first end surface 10a of the main body 11b may also be referred to as a top sealing portion.
The sealing portion 11a protrudes from the body portion 11b of the battery cell 10, and as shown in fig. 1 and fig. 2, the sealing portion 11a is not extended along the second direction y, but is bent toward the first end surface 10a and fixed to the first end surface 10a, so as to reduce the overall length of the battery cell 10, and the second direction y is the length direction of the battery cell 10. It should be understood that, in the battery cell 10, the encapsulating portion 11a may also be unfolded and extend along the second direction y, and the tab is also unfolded at this time, and the extending direction of the tab 13 is the second direction y. In the embodiment of the present application, the thickness direction of the battery cell 10 may be a first direction x, the width direction of the tab 13 may be a third direction z, and two of the first direction x, the second direction y and the third direction z are perpendicular to each other, which is to be noted that the limitation is limited by an error in actual processing or measurement, and the perpendicular direction in the present application does not require that an included angle between the two directions is necessarily 90 °, but allows a deviation of ± 10 °, that is, the perpendicular direction may be understood as an included angle between any two directions being 80 ° to 100 °.
The sealing portion 11a is bent toward the first end face 10a and fixed to the first end face 10a, and includes any one of the following three scenarios: in a first scenario, the sealing portion 11a is in at least partial region contact with the first end face 10a, for example, a part of a side surface of the sealing portion 11a close to the first end face 10a is in contact with the first end face 10a, or a whole side surface of the sealing portion 11a close to the first end face 10a is in contact with the first end face 10 a. In the second scenario, the encapsulation portion 11a and the first end surface 10a are oppositely disposed along the second direction y, and there is a predetermined distance therebetween, and the predetermined distance may be determined according to the actual scenario requirement, and may be, for example, greater than 0 and less than or equal to 1 mm. In a third scenario, an adhesive member, such as a double-sided tape, is disposed between the sealing portion 11a and the first end face 10a, and the adhesive member adheres the sealing portion 11a to the first end face 10 a.
In a scene where the battery cell 10 has positive and negative polarities, the electrode assembly includes a positive electrode plate, a negative electrode plate, and a separation film disposed between the positive electrode plate and the negative electrode plate. The electrode assembly may be formed by winding or laminating a plurality of electrode sheets, one end of the tab 13 is electrically connected to the electrode assembly, for example, extends into the package bag 11 and is electrically connected to the electrode sheet of the corresponding polarity, and the other end of the tab 13 extends out of the package part 11 a.
The tab 13 includes a first tab 13a and a second tab 13b, the first tab 13a is a negative tab, and correspondingly, the second tab 13b is a positive tab. The first tab 13a is electrically connected with the negative electrode plate, and the second tab 13b is electrically connected with the positive electrode plate and respectively extends out of the packaging bag 11. In other embodiments, the first tab 13a may be a positive tab and the second tab 13b may be a negative tab. The structure of the tab 13 of the embodiment of the present application will be described herein, taking one of them as an example.
It should be understood that the structure and shape of the tab 13 are not limited by the embodiments of the present application. For example, the tab 13 may have a rectangular strip structure, and the respective sizes may be set adaptively according to actual needs, and the material includes, but is not limited to, aluminum, nickel, copper, and alloys such as nickel plating of copper. For example, the material of the positive electrode tab 13 may be aluminum or nickel-plated aluminum, and the material of the negative electrode tab 13 may be nickel-plated copper, which not only improves the electrical connection performance with the negative electrode tab, but also improves the structural strength of the negative electrode tab.
The tab glue 14 is positioned between the tab 13 and the packaging part 11a, and the tab glue 14 is bonded with the tab 13 and is also bonded with the packaging bag 11 (such as an aluminum plastic film of a soft packaging bag), so that the sealing effect of the packaging bag 11 at the tab 13 is improved. The tab jelly 14 may be respectively provided to first and second surfaces of the tab 13, the first and second surfaces being oppositely disposed in a thickness direction of the tab 13.
Fig. 1 to fig. 3 are schematic structural views of the tab glue 14 in an unbent state; fig. 4 and 5 are schematic structural views of the tab glue 14 in a bent state.
As for the tab glue 14 in the unbent state, as shown in fig. 1 to fig. 3, the tab glue 14 includes an exposed portion 141 extending out of the packaging portion 11a, the exposed portion 141 includes a first portion 1411 and a second portion 1412 disposed oppositely along the extending direction (i.e., the second direction y) of the tab 13, a void-avoiding area 141d is disposed between the first portion 1411 and the second portion 1412, the void-avoiding area 141d forms a folding line perpendicular to the extending direction y of the tab 13 on the tab glue 14, and at the folding line, the bending difficulty of the tab 13 and the tab glue 14 is less than that of the rest positions.
For the tab glue 14 in the bent state, as shown in fig. 4 and 5, the tab glue 14 includes an exposed portion 141 extending out of the packaging portion 11a, the exposed portion 141 includes a first sub-portion 141a, a bent portion 141b, and a second sub-portion 141c, the first sub-portion 141a is connected with the packaging portion 11a and extends along the first direction x, the second sub-portion 141c is opposite to the first sub-portion 141a along the second direction y, the bent portion 141b is connected with the first sub-portion 141a and the second sub-portion 141c, and the bent portion 141b is provided with a keep-out area 141 d. After the battery cell 10 changes from fig. 1 to fig. 3 to the state of fig. 4 and fig. 5, the first portion 1411 is transformed into the first sub-portion 141a, and the second portion 1412 is transformed into the bent portion 141b and the second sub-portion 141 c.
The space-avoiding region 141d can reduce the bending difficulty of the tab adhesive 14, and the length of the bent portion 141b in the length direction (i.e., the second direction y) of the battery cell 10 is reduced, which is beneficial to reducing the packaging space required by the battery cell 10 and improving the capacity of the battery cell 10.
It should be understood that the tab compound 14 may be provided with the first sub-part 141a and the bent part 141b instead of the second sub-part 141 c. The length of the bent portion 141b in the second direction y can be understood as: the length of the orthographic projection of the bent portion 141b in the second direction y is viewed along the first direction x. Correspondingly, as shown in fig. 1 to 3, the bent portion 141b extends along the second direction y before bending, the first sub-portion 141a and the second sub-portion 141c extend along the second direction y before bending, and after bending, the first sub-portion 141a extends along the first direction x, and the second sub-portion 141c extends along the opposite direction of the first direction x; the length of the keep-out area 141d in the second direction y is greater in the unfolded state than in the folded state.
As shown in fig. 4 and 5, the bending portion 141b includes a first bending portion 141e and a second bending portion 141f oppositely disposed along the second direction y, and the void-free area 141d is disposed between the first bending portion 141e and the second bending portion 141 f. In this embodiment, when the battery cell 10 is in the unbent state, the void-avoiding regions 141d are continuously distributed on the exposed portion 141 perpendicular to the extending direction of the tab 13, and when the battery cell 10 is in the bent state, the void-avoiding regions 141d are continuously distributed on the bent portion 141b along the third direction z, which can be regarded as the void-avoiding regions 141d penetrating through the bent portion 141b along the third direction z.
As shown in fig. 4, 5 and 6, the first bent portion 141e and the second bent portion 141f are both in a segment of arc-shaped structure, and the radius of curvature of the first bent portion 141e is R1The second bent portion 141f has a radius of curvature R2Radius of curvature R1Can be understood as being related toA length equal to the distance between one end of a bent portion 141e, the other end of the first bent portion 141e, and the middle point of the one end and the other end of the first bent portion 141e, and a curvature radius R2It can be understood as a length equal to a distance between one end of the second bent portion 141f, the other end of the second bent portion 141f, and a middle point between the one end and the other end of the second bent portion 141 f. In some scenarios, 0.1mm ≦ R1≤0.5mm，0.1mm≤R2Less than or equal to 0.5mm, through reducing the radius of curvature of the first bent part 141e and the second bent part 141f, the curvature of the first bent part 141e and the second bent part 141f is reduced, and the length of the bent part 141b in the second direction y is reduced, which is beneficial to reducing the packaging space required by the battery cell 10 and improving the capacity of the battery cell 10.
In some scenarios, as shown in fig. 7, the keep-out zone 141d may be made by a laser cutting process. The cell 10 with the tab 13 and the tab glue 14 not bent is placed in a predetermined area and positioned by the positioning device 71, the laser generating device 72 cuts one side of the tab glue 14 (i.e., the tab glue 14 on one side of the tab 13) along the third direction z, and then turns over the cell 10 and cuts the other side of the tab glue 14 (i.e., the tab glue 14 on the other side of the tab 13), so as to obtain the keep-out area 141 d. In the laser cutting process, the continuously distributed clearance areas 141d are beneficial to reducing the preparation difficulty.
In some embodiments, the length of the void-avoiding region 141D before bending may be greater than the length after bending along the second direction y, as shown in fig. 5, the length of the void-avoiding region 141D after bending is D1And 0 < D1Less than or equal to 0.4 mm. By reducing the length of the evasive space 141D in the second direction y, the distance D between the first bent part 141e and the second bent part 141f is reduced1The risk of the burrs and the like at the edges of the keep-out area 141d (i.e., at the cut edges of the first bent portion 141e and the second bent portion 141f) piercing the packaging adhesive used for packaging and protecting the head structure of the battery cell 10, so as to isolate the head structure (e.g., the packaging portion 11a and the circuit board 21) from the outside (including electrical insulation) and the like can be reduced.
In some embodiments, please refer to FIGS. 4 and 5 in combinationThe length of the first bending part 141e after bending along the second direction y is D2And D is not more than 0.2mm2Less than or equal to 1.0mm by decreasing D2The risk that the burrs and the like of the first bending portion 141e at the fracture (i.e., the cut edge) may pierce the adhesive tape can be reduced. The length of the first bent portion 141e after bending can be understood as: the length of the orthographic projection of the first bent portion 141e in the second direction y is viewed along the first direction x.
In some embodiments, as shown in fig. 5, the length of the bent portion 141b in the first direction x is D3And D is not more than 0.1mm3Less than or equal to 0.5mm by decreasing D3The length of the bent portion 141b in the thickness direction of the battery cell 10 (i.e., the first direction x) is reduced, which is beneficial to reducing the thickness of the entire battery cell 10. The length of the bent portion 141b in the first direction x can be understood as: an orthographic projection of the bent portion 141b (including the first bent portion 141e and the second bent portion 141f) on the first direction x is a length as viewed in the second direction y.
Second embodiment
Various embodiments of the present application use like reference numerals to identify like named structural elements.
On the basis of the foregoing description of the embodiment, but unlike the foregoing, as shown in fig. 8 and 9, the structure of the tab paste 14 is schematically illustrated in an unbent state. In the battery cell 10 of the present embodiment, when the battery cell 10 is in the unfolded state, the void-avoiding regions 141d are spaced apart from each other on the exposed portion 141, perpendicular to the extending direction of the tab 13, and when the battery cell 10 is in the folded state, the void-avoiding regions 141d are spaced apart from each other on the folded portion 141b along the third direction z. The first bending part 141e and the second bending part 141f are still connected but not completely disconnected, which is beneficial to improving the structural strength of the bending part 141b, improving the protection effect of the tab 13, and reducing the risk that burrs and the like of the first bending part 141e and the second bending part 141f at the fracture (i.e., the edge of the clearance area 141 d) pierce the packaging adhesive tape.
The shape of each keep-out area 141d may be a rectangle as shown in fig. 8 and 9, or may be another type of polygon such as a circle and a triangle, and the embodiment of the present application is not limited thereto.
In addition, the number of the void-avoiding regions 141d provided in the tab glue 14 at each tab 13 is not limited in the present embodiment, and the four void-avoiding regions 141d shown in fig. 8 and 9 are only exemplary.
Third embodiment
On the basis of the foregoing description of the first embodiment, but with a difference therebetween, please refer to fig. 10 and fig. 11 together, which are schematic structural views of the tab glue 14 in an unbent state. The first bent portion 141e and the second bent portion 141f are maintained at the same length before and after bending, and the third bent portion 141e and the second bent portion 141f are also maintained at the same length before and after bending, respectively, along the third direction z. For convenience of description, the present embodiment identifies a difference between lengths of the first bent portion 141e and the second bent portion 141f in fig. 10 and 11 in an unfolded state.
In the battery cell 10 of the present embodiment, when the battery cell 10 is in an unfolded state, the length of the first portion 1411 is smaller than that of the second portion 1412 on at least one side (for example, the left side and the right side shown in fig. 11) of the tab 13 along the direction y perpendicular to the extending direction y of the tab 13, and when the battery cell 10 is in a folded state, the lengths of the second bent portions 141f are smaller than those of the first bent portions 141e on the first side and the second side (i.e., the left side and the right side shown in fig. 11) of the tab 13 along the third direction z, so as to reduce the risk that burrs, etc. of the second bent portions 141f at the cut-outs pierce the packaging adhesive tapes.
Optionally, the difference between the lengths of the second bent portion 141f and the first bent portion 141e is D on the left side or the right side of the tab 13 along the third direction z0And 0.5mm < D0Less than or equal to 3.0 mm. It should be understood that, on the left side or the right side of the tab 13, the difference between the lengths of the second bent portion 141f and the first bent portion 141e may be equal or unequal; alternatively, the second bent portion 141f and the first bent portion 141e have a difference in length only at one side thereof, and have the same length (i.e., are flush) at the other side thereof.
In other embodiments, the length of the first bent part 141e may be less than the length of the second bent part 141f only on at least one side of the tab 13 along the third direction z.
Fourth embodiment
On the basis of the description of the foregoing embodiment, but different from the description, as shown in fig. 12 to fig. 15, the structure of the tab paste 14 in the unbent state is schematically illustrated, and as shown in fig. 16 and fig. 17, the structure of the tab paste 14 in the bent state is schematically illustrated.
In the scenario shown in fig. 16 and 17, the first side portion is located on the left side of the tab 13, and the second side portion is located on the right side of the tab 13.
In this embodiment, the empty avoiding area 141d is disposed on the second side of the bending portion 141b, that is, the bending portion 141b is disposed on the right side of the tab 13 to provide the empty avoiding area 141d, the empty avoiding area 141d can reduce the bending difficulty of the tab glue 14, the tab glue 14 is not disposed on the inner side of the tab 13, and the tab glue 14 on the inner side can reduce the risk of the tab 13 electrically contacting with the circuit board 21 and the aluminum-plastic film cut by the packaging portion 11a, so as to reduce the safety risk caused by the short circuit of the battery cell 10 as a whole.
As shown in fig. 17, the tab compound 14 located on the side of the tab 13 facing the sealing portion 11a has a length D in the second direction y4And 0.5mm < D42.5mm or less, and the length of the tab glue 14 on one side of the tab 13 facing the packaging part 11a in the second direction y is increased, so that the risk of electrical contact between the tab 13 and the circuit board 21 and the aluminum plastic film of the cutting notch of the packaging part 11a can be reduced.
With reference to fig. 16 and fig. 17, in a scenario where the battery cell 10 and the circuit board 21 of the present embodiment are connected to form the battery 20, the circuit board 21 may be disposed adjacent to the packaging portion 11a, and correspondingly, the tab 13 extends to a side (i.e., above) of the circuit board 21 facing away from the packaging portion 11a after being bent, in order to adapt to the scenario, the tab glue 14 may only include a first sub-portion 141a and a bent portion 141b, and the bent portion 141b may include two portions, one portion connected to the first sub-portion 141a may be equivalent to the first bent portion 141e described in the foregoing embodiment, and the other portion may extend along the second direction y without being bent, so that a bent portion of the tab glue 14 may be reduced, and a risk of the tab glue 14 breaking due to bending may be reduced.
It should be understood that the foregoing embodiments may also adopt the arrangement of the present embodiment, that is, the bent portion 141b is provided with the space-avoiding region 141d corresponding to each embodiment on the outer side of the tab 13, and the space-avoiding region 141d is not provided on the inner side, so that the safety risk caused by the short circuit of the battery cell 10 may also be reduced.
The embodiment of the present application further provides a battery, as shown in fig. 4 to 6, the battery 20 includes a circuit board 21 and the battery cell 10 of any of the above embodiments, the circuit board 21 is disposed on a side of the packaging portion 11a facing away from the electrode assembly, and the circuit board 21 is electrically connected to the tab 13 of the battery cell 10, for example, the circuit board 21 is electrically connected to the tab 13 through a conductive member 22. Alternatively, as shown in fig. 4 to 6, the circuit board 21 is fixed to the upper surface of the packaging part 11a, and the length of the head structure of the battery 20 in the second direction y is reduced, thereby facilitating reduction of the head space of the battery 20.
The type of the battery 20 for the circuit board 21 is not limited in the embodiments of the present application, and the shape, size, and function of the circuit board 21 may be determined according to the application. For example, in some scenarios, the Circuit Board 21 may be a rigid Circuit Board, such as a Printed Circuit Board (PCB), or a Flexible Circuit Board (FPC), and the Circuit Board 21 may be integrated with a BMS (Battery management system) for controlling charging and discharging of the Battery cell 10 to ensure safety.
In a particular scenario, the battery 20 includes, but is not limited to, all kinds of primary, secondary, fuel, solar and capacitor (e.g., supercapacitor) batteries, which may be pouch batteries. The battery 20 may preferably be a lithium secondary battery. The battery 20 of the embodiment of the present application may be present in the form of a single battery, a battery cell, or a battery module.
An embodiment of the present application further provides an electronic device, which includes a load and the battery 20 or the battery cell 10 of any of the above embodiments, where the battery 20 or the battery cell 10 supplies power to the load.
Electronic devices may be implemented in various specific forms, such as electronic products like unmanned aerial vehicles, electric cleaning tools, energy storage products, electric vehicles, electric bicycles, electric navigation tools, and so on. In a practical scenario, the electronic device specifically includes but is not limited to: the power supply comprises a standby power supply, a motor, an automobile, a motorcycle, a power-assisted bicycle, a bicycle electric tool, a household large-scale storage battery, a lithium ion capacitor and the like.
It will be understood by those skilled in the art that the configuration according to the embodiments of the present application can be applied to electronic devices of a stationary type, in addition to elements particularly for moving purposes.
Since the battery 20 and the electronic apparatus have the battery cell 10 of any one of the foregoing embodiments, the battery 20 and the electronic apparatus can produce the beneficial effects that the battery cell 10 of the corresponding embodiment has.
It should be understood that the above-mentioned embodiments are only some examples of the present application, and not intended to limit the scope of the claims of the present application, and all structural equivalents made by those skilled in the art using the contents of the present specification and the attached drawings are included in the scope of the claims of the present application.
Although the terms "first, second, etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well. The terms "or" and/or "are to be construed as inclusive or meaning any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
In addition, in the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing technical solutions and simplifying the description of the respective embodiments of the present application, and do not indicate or imply that a device or an element must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be construed as limiting the present application.
Claims (20)
1. A cell, comprising:
the packaging bag comprises a main body part and a packaging part, wherein the packaging part extends out of a first end face of the main body part;
an electrode assembly housed within the body portion;
one end of the tab is electrically connected to the electrode assembly, and the other end of the tab extends out of the packaging part;
the tab glue is positioned between the tab and the packaging part;
it is characterized in that the preparation method is characterized in that,
the tab glue comprises an exposed part extending out of the packaging part, the exposed part is provided with a keep-out area, and the keep-out area forms an easy-folding line perpendicular to the extending direction of the tab on the tab glue.
2. The battery cell of claim 1, wherein the exposed portion comprises a first portion and a second portion that are oppositely disposed along an extending direction of the tab, and the clearance area is disposed between the first portion and the second portion.
3. The battery cell of claim 2, wherein the keep-out areas are continuously distributed on the exposed portion perpendicular to the extending direction of the tab.
4. The battery cell of claim 2, wherein the keep-out areas are spaced apart on the exposed portion perpendicular to the extending direction of the tab.
5. The battery cell of claim 1, wherein the exposed portion comprises a first portion and a second portion oppositely disposed along the extending direction of the tab; the length of the first part is smaller than that of the second part on at least one side of the tab along the direction perpendicular to the extension direction of the tab.
6. The cell of claim 5, wherein the cell is oriented perpendicular to the coreThe extension direction of the tab is that the difference between the lengths of the second part and the first part is D on at least one side of the tab0And 0.5mm < D0≤3.0mm。
7. The battery cell of any one of claims 1 to 6, wherein the keep-out zone is disposed on one side of the exposed portion, which is located on the tab.
8. A battery, comprising:
the packaging bag comprises a main body part and a packaging part, wherein the packaging part extends out of a first end face of the main body part, and is bent and fixed to the first end face;
an electrode assembly housed within the body portion;
one end of the tab is electrically connected to the electrode assembly, and the other end of the tab extends out of the packaging part;
the tab glue is positioned between the tab and the packaging part, the tab glue comprises an exposed part extending out of the packaging part, the exposed part comprises a first sub-part and a bent part, the first sub-part is connected with the packaging part and extends along a first direction, the bent part is connected with the first sub-part, the bent part is provided with a keep-out area, and the keep-out area forms an easy folding line perpendicular to the extending direction of the tab on the tab glue;
the circuit board is arranged on one side, back to the electrode assembly, of the packaging part and is electrically connected with the electrode lugs of the battery cell.
9. The battery according to claim 7, wherein the bending portion includes a first bending portion and a second bending portion oppositely disposed along a second direction, the second direction is perpendicular to the first direction, and the void-avoiding region is disposed between the first bending portion and the second bending portion.
10. The battery according to claim 9, wherein the keep-out areas are continuously distributed along a third direction at the bent portion, the third direction being perpendicular to the first direction and the second direction.
11. The battery of claim 9, wherein the keep-out areas are spaced apart on the bent portion along a third direction, and the third direction is perpendicular to the first direction and the second direction.
12. The battery according to claim 8, wherein the bent portion comprises a first bent portion and a second bent portion oppositely arranged along a second direction, and the second direction is perpendicular to the first direction; and along a third direction, at least one side of the tab, the length of the first bending part is smaller than that of the second bending part, and the third direction is perpendicular to the first direction and the second direction.
13. The battery of claim 12, wherein the difference between the lengths of the second and first bent portions is D on either side of the tab along the third direction0And 0.5mm < D0≤3.0mm。
14. The battery according to any one of claims 9 to 13, wherein the evasive space has a length D along the second direction1And 0 < D1≤0.4mm。
15. The battery according to any one of claims 9 to 13, wherein the length of the first bent portion in the second direction is D2And D is not more than 0.2mm2≤1.0mm。
16. The battery according to any one of claims 9 to 13, wherein the length of the bent portion is D in the first direction3And D is not more than 0.1mm3≤0.5mm。
17. The battery according to any one of claims 9 to 13, wherein the radius of curvature of the first bent portion is R1The curvature radius of the second bending part is R2And R is not less than 0.1mm1≤0.5mm，0.1mm≤R2≤0.5mm。
18. The battery according to claim 8, wherein the side of the bending part facing away from the packaging part is provided with the keep-out area.
19. The battery as set forth in claim 18, wherein the tab compound on the side facing the packaging part in the second direction has a length D4And 0.5mm < D4≤2.5mm。
20. An electronic device comprising a load and the cell of any one of claims 1 to 7 or the battery of any one of claims 8 to 19, the cell or battery being configured to supply power to the load.
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| CN202110872499.5A CN113611986B (en) | 2021-07-30 | 2021-07-30 | Battery cell, battery and electronic equipment |
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| CN202110872499.5A CN113611986B (en) | 2021-07-30 | 2021-07-30 | Battery cell, battery and electronic equipment |
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