CN114188597A - Electrochemical device, battery module and electric equipment - Google Patents
Electrochemical device, battery module and electric equipment Download PDFInfo
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- CN114188597A CN114188597A CN202111415414.7A CN202111415414A CN114188597A CN 114188597 A CN114188597 A CN 114188597A CN 202111415414 A CN202111415414 A CN 202111415414A CN 114188597 A CN114188597 A CN 114188597A
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- 238000007789 sealing Methods 0.000 claims abstract description 154
- 238000004806 packaging method and process Methods 0.000 claims abstract description 132
- 238000005538 encapsulation Methods 0.000 claims abstract description 38
- 210000005056 cell body Anatomy 0.000 claims description 60
- 238000005452 bending Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 12
- 238000012856 packing Methods 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 239000008393 encapsulating agent Substances 0.000 claims 1
- 230000006978 adaptation Effects 0.000 abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present application relates to an electrochemical device comprising a packaging bag comprising a first packaging surface, a first packaging side and a second packaging side; the packaging bag further comprises an angle sealing part and a side sealing edge, the angle sealing part is respectively connected with the first packaging side face and the second packaging side face, the side sealing edge is connected with the first packaging side face, the angle sealing part and the side sealing edge are bent along the direction perpendicular to the first packaging surface, the outer surface of the angle sealing part is an outward convex cambered surface, and the cambered surface does not protrude out of the first packaging side face and the second packaging side face. To the electric core body that has the arc chamfer face, can make the arc chamfer face of angle seal portion encapsulation electric core body, the cambered surface and the arc chamfer face looks adaptation of angle seal portion to improve the space utilization of electric core body to accepting the chamber, thereby improve electrochemical device's energy density.
Description
Technical Field
The application relates to the technical field of batteries, in particular to an electrochemical device, a battery module and electric equipment.
Background
The lithium ion battery has the characteristics of high energy density, long cycle performance, small pollution and the like, and is widely applied to products such as mobile phones, flat panels, notebook computers, electric vehicles and the like. With the rapid development of the market and the advancement of technology, the demand for energy density of the battery is higher and higher, and under the circumstance, people will select lithium ion batteries with higher energy density more frequently.
Lithium ion battery is including naked electric core and wrapping bag usually, and the wrapping bag is used for acceping naked electric core and electrolyte, and lithium ion battery is in the assembling process, and the occupation space of naked electric core in the wrapping bag is directly influencing lithium ion battery's energy density.
Disclosure of Invention
In view of the above problem, this application has provided an electrochemical device, battery module and consumer, can alleviate the wrapping bag and influence the technical problem of battery energy density at the in-process of acceping naked electric core.
The technical scheme of the application is realized as follows:
in a first aspect, embodiments of the present application provide an electrochemical device comprising a packaging bag comprising a first packaging surface, a first packaging side, a second packaging side, a seal, and a side seal. The first encapsulation side with the second encapsulation side connect respectively in two adjacent side edges on first encapsulation surface, the angle sealing portion respectively with first encapsulation side with the second encapsulation side is connected, the side banding connect in first encapsulation side, the angle sealing portion with the side banding all is followed the perpendicular to the direction of first encapsulation surface is buckled, just the surface of angle sealing portion is outside convex cambered surface, the cambered surface not bulge in first encapsulation side with the second encapsulation side.
In the technical scheme of this application embodiment, angle sealing portion and side seal all buckle along the direction of the first encapsulation surface of perpendicular to, and the surface of angle sealing portion is outside convex cambered surface, the cambered surface does not protrude in first encapsulation side and second encapsulation side, to the electric core body that has the arc chamfer face, can make the arc chamfer face of angle sealing portion encapsulation electric core body, the cambered surface and the arc chamfer face looks adaptation of angle sealing portion, in order to improve the space utilization of electric core body to accepting the chamber, thereby improve electrochemical device's energy density.
In some embodiments, the electrochemical device further comprises a cell body. The battery cell body is accommodated in the packaging bag, and the battery cell body comprises a first surface, a first side surface, a second side surface and an arc-shaped chamfer surface. The first side face and the second side face are respectively connected to two adjacent edges of the first surface, and the arc-shaped chamfer face is respectively connected with the first side face and the second side face. The first surface is packaged by the first packaging surface, the first side surface is packaged by the first packaging side surface, the second side surface is packaged by the second packaging side surface, the outline of the corner sealing part is matched with the arc-shaped chamfer surface, and the arc-shaped chamfer surface is packaged by the corner sealing part. When the battery cell body is accommodated in the accommodating groove, the arc-shaped chamfer surface can be encapsulated by the arc surface of the angle sealing part, and when the outline of the angle sealing part is the same as or matched with the arc-shaped chamfer surface, the distance from each point on the arc-shaped chamfer surface to the angle sealing part can be ensured to be the same to the greatest extent, so that the volume of the battery cell body can be increased to the greatest extent or the outline dimension of the packaging bag can be reduced, the space of the accommodating cavity can be fully utilized, and the energy density of the electrochemical device can be improved.
In some embodiments, the side seal includes a first portion and a second portion connected. The first portion is connected with the second package side face, the second portion is connected with the corner sealing portion, the first portion, the second portion and the corner sealing portion are sequentially overlapped, and the second portion at least partially overlaps the corner sealing portion. The first portion, the second portion and the corner seal are stacked in sequence, so that the overall dimension of the electrochemical device can be reduced, and the energy density of the electrochemical device can be improved.
In some embodiments, the electrochemical device further comprises an encapsulation adhesive for securing the corner seal and the second portion. The packaging adhesive can fixedly connect the second part with the corner seal part on one hand, and can also seal the gap between the second part and the corner seal part so as to ensure the structural integrity of the electrochemical device.
In some embodiments, the shape of the overlapping portion of the second portion and the corner seal portion is an isosceles triangle. After the side sealing edge is completely attached to the corner sealing part, the isosceles triangles of the overlapped part are completely attached to the corner sealing part, so that the second part and the corner sealing part are fixed through packaging glue, and the sealing performance of the electrochemical device structure is guaranteed.
In some embodiments, the bent portion of the side seal edge is affixed to the first package side. The side seal edge is closely attached to the first package side surface to reduce the overall dimension of the electrochemical device.
In some embodiments, the cell body further comprises a second surface. The second surface is opposite to the first surface, the first surface is respectively connected with the first side surface, the second side surface and one side of the arc-shaped chamfer surface, and the second surface is respectively connected with the first side surface, the second side surface and the other side of the arc-shaped chamfer surface. The package also includes a second package surface, the second package surface encapsulating the second surface. A vertical distance from the first package surface to the side seal edge in a direction perpendicular to the first package surface and the second package surface is no more than 20 microns, and/or a vertical distance from the second package surface to the side seal edge is no more than 20 microns. The side sealing edge does not protrude from the first packaging surface and the second packaging surface along a direction perpendicular to the first packaging surface and the second packaging surface.
The first package surface is at a vertical distance of no more than 20 microns from the corner seal and/or the second package surface is at a vertical distance of no more than 20 microns from the corner seal in a direction perpendicular to the first and second package surfaces. The corner seal does not protrude from the first and second package surfaces in a direction perpendicular to the first and second package surfaces.
The 20 micron size for satisfying the hem technological requirement, angle seal and side seal are after buckling, and the height of the two should set up as unanimity as far as, for guaranteeing that electrochemical device has less overall dimension, also can cut out the part that back side seal and angle seal surpassed first encapsulation surface and second encapsulation surface after buckling to make side seal and angle seal all not protrusion in first encapsulation surface and second encapsulation surface.
In a second aspect, embodiments of the present application also provide a battery module including the electrochemical device according to the first aspect. The battery module of the embodiment has higher energy density, so that the battery module of the embodiment has stronger cruising ability.
In a third aspect, an embodiment of the present application further provides an electric device, including the battery module according to the second aspect. The electrochemical device or the battery module can be applied to the electric equipment, and the electric equipment comprises products such as a mobile phone, a tablet, a notebook computer, an electric vehicle and the like. The electrochemical device or the battery module of the electric equipment adopting the electrochemical device or the battery module has higher energy density, so that the electric equipment has stronger cruising ability.
In a fourth aspect, embodiments of the present application further provide a method of manufacturing an electrochemical device as described in the first aspect above, the method comprising:
s100, providing a cell body, wherein the cell body is provided with a first packaging surface and an arc-shaped chamfer surface.
S200, providing a packaging bag, wherein the packaging bag is provided with a corner sealing part and a side sealing edge.
S300, placing the battery cell body into the packaging bag.
S400, bending the corner sealing part and the side sealing edge along a direction perpendicular to the first packaging surface, and bonding the corner sealing part and the side sealing edge; wherein, the outer surface of the corner sealing part is an arc surface protruding outwards.
And S500, encapsulating the arc-shaped chamfer surface of the battery cell body by the corner sealing part.
In the technical scheme of the embodiment of the application, the angle sealing part and the side sealing edge are both bent along the direction perpendicular to the first packaging surface, and the outer surface of the angle sealing part is an outward convex arc surface, so that the angle sealing part packages the arc-shaped chamfer surface of the battery cell body, and the arc surface of the angle sealing part is matched with the arc-shaped chamfer surface, so that the space utilization rate of the battery cell body to the accommodating cavity is improved, and the energy density of the electrochemical device is improved; meanwhile, the folding process is simple and convenient by adopting two times of folding, and the packaging bag is convenient to seal.
In some embodiments, the cell body further includes a first surface, a first side, and a second side. The first side face and the second side face are respectively connected to two adjacent edges of the first surface, and the arc-shaped chamfer face is respectively connected with the first side face and the second side face.
Wherein, the electricity core body is put into the wrapping bag includes:
the wrapping bag includes packing shell and lower packing shell, will the electricity core body is put into between last packing shell and the lower packing shell and heat-seal the edge of last packing shell and lower packing shell, go up packing shell and lower packing shell and constitute jointly the wrapping bag. Wherein the package further comprises a second package side, a corner seal, and a side seal. The first surface is packaged by the first packaging surface, the first side surface is packaged by the first packaging side surface, the second side surface is packaged by the second packaging side surface, the side sealing edge is connected with the second packaging side surface, and the corner sealing part is respectively connected with the first packaging side surface and the second packaging side surface.
Based on the above embodiment, the step of bending the corner seal and the side seal along a direction perpendicular to the first package surface and bonding the corner seal and the side seal further includes:
and S410, determining the center point of the cambered surface.
And S420, determining a tangent line of the cambered surface passing through the central point of the cambered surface.
And S430, bending the corner sealing part along the direction perpendicular to the first packaging surface according to the tangent.
S440, bending the side sealing edge along a direction perpendicular to the first packaging surface to enable the side sealing edge and the corner sealing part to be partially overlapped.
And S450, bonding the corner sealing part and the side sealing edge.
In this embodiment, through finding out the tangent line of crossing cambered surface central point earlier, carry out the hem according to this tangent line again, after folding, two sides of angle seal portion are perpendicular to first encapsulation side and second encapsulation side respectively to prevent to make the bottom thickening of side seal or second encapsulation side when buckling, so that subsequent folding operation.
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.
Drawings
Fig. 1 is a schematic structural view of an electrochemical device according to an embodiment of the present application;
FIG. 2 is a schematic view illustrating a crimping process of an electrochemical device according to an embodiment of the present application;
FIG. 3 is a schematic view illustrating a process of crimping an electrochemical device according to an embodiment of the present application;
FIG. 4 is a partial enlarged view A of FIG. 3;
fig. 5 is a block flow diagram of a method of manufacturing an electrochemical device according to an embodiment of the present application;
fig. 6 is a block diagram of a sub-flow of S400 in fig. 5.
Description of reference numerals:
100. an electrochemical device;
10. a first package surface;
20. a first package side;
30. a second package side;
40. a third package side;
50. a corner seal;
60. side edge sealing; 61. a first portion; 62. a second portion;
70. a tab;
80. a cell body; 81. an arc-shaped chamfer surface.
Detailed Description
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," "up," "down," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In a first aspect, an embodiment of the present application provides an electrochemical device 100, and referring to fig. 1, the electrochemical device 100 includes a packaging bag, and the packaging bag includes a first packaging surface 10, a second packaging surface (not shown), a first packaging side 20, a second packaging side 30, and a third packaging side 40. The first package surface 10, the second package surface, the first package side surface 20, the second package side surface 30, and the third package side surface 40 together enclose a receiving cavity, and the receiving cavity is used for receiving the battery cell body 80 and the electrolyte. In some embodiments, the receiving cavity may be configured as a rectangular parallelepiped, wherein the first package surface 10 and the second package surface are disposed opposite to each other, the first package side surface 20 and the third package side surface 40 are disposed opposite to each other, the second package side surface 30 may be regarded as a bottom surface of the electrochemical device 100, and a surface opposite to the second package side surface 30 may be regarded as a top surface of the packaging bag. The first package side 20 and the second package side 30 are respectively connected to two adjacent side edges of the first package surface 10, and it should be understood that the outline of the package bag is not limited to the rectangular parallelepiped structure in the above embodiment, and may be a cube or an isosceles trapezoid structure.
In general, the package will form a seal by heat sealing after being folded in half, in the embodiment of the present application, the package further includes a corner seal 50 and a side seal 60, the corner seal 50 is respectively connected to the first package side 20 and the second package side 30, the corner seal 50 can also be configured as a part of the second package side 30, the side seal 60 is connected to the first package side 20, the side seal 60 is located on the outer surface of the first package side 20, the corner seal 50 and the side seal 60 are both bent in a direction perpendicular to the first package surface 10, and the outer surface of the corner seal 50 is an outwardly convex arc that does not protrude from the first package side 20 and the second package side 30.
It should be noted that, when the arc surface of the corner seal 50 protrudes from the first package side surface 20 and/or the second package side surface 30, the external dimension of the electrochemical device 100 is increased, which is not favorable for increasing the energy density of the electrochemical device 100; in the embodiment of the present application, in order to improve the energy density of the electrochemical device 100, the arc surface of the corner seal 50 is set not to exceed the first package side surface 20 and the second package side surface 30, and the contour of the corner seal 50 should be set to be consistent with the structure at the corner of the internal cell body 80 as much as possible.
It is to be understood that the electrochemical device 100 has a left-right symmetrical structure in a general case, the corner seal 50 and the side seal 60 are not limited to one, the other side seal 60 may be connected to the outer surface of the third encapsulation side 40, and the other corner seal 50 may be connected between the third encapsulation side 40 and the second encapsulation side 30. In general, since the two corner seals 50 have the same structure and are symmetrical about the center line of the electrochemical device 100, the following embodiments describe the technical solutions of the embodiments of the present application with the corner seal 50 between the first package side surface 20 and the second package side surface 30, and similarly, the following embodiments describe the technical solutions of the embodiments of the present application with the side seal 60 of the first package side surface 20.
In some embodiments, the electrochemical device 100 further includes a cell body 80, and the pole piece angle of the cell body 80 is generally arc-shaped, so that the side surface and the bottom surface of the cell body 80 are connected by an arc transition. When the battery cell body 80 is placed into the packaging bag, the packaging bag needs to be pre-packaged with angular arcs after being exhausted.
Referring to fig. 1, the battery cell body 80 is accommodated in the accommodating cavity of the above-mentioned packaging bag, the battery cell body 80 can be formed by winding or laminating a positive electrode plate, an isolating film and a negative electrode plate in sequence, and the isolating film is between the positive electrode plate and the negative electrode plate to separate the positive electrode plate and the negative electrode plate. In some embodiments, the shape of the battery cell body 80 is adapted to the accommodating cavity, the battery cell body 80 includes a first surface, a second surface, a first side surface, a second side surface, a third side surface, a top surface, and an arc-shaped chamfered surface 81, the first side surface and the second side surface of the battery cell body 80 are respectively connected to two adjacent edges of the first surface, and the arc-shaped chamfered surface 81 is respectively connected to the first side surface and the second side surface. When the cell body 80 is accommodated in the accommodating cavity, the first packaging surface 10 packages the first surface, the second packaging surface packages the second packaging side surface 30, the first packaging side surface 20 packages the first side surface, the second packaging side surface 30 packages the second side surface, the third packaging side surface 40 packages the third side surface, the top surface of the cell body 80 is packaged by the top surface of the packaging bag, the arc-shaped chamfered surface 81 of the cell body 80 directly faces the corner sealing part 50 of the packaging bag, the outline of the corner sealing part 50 is matched with the arc-shaped chamfered surface 81, and the corner sealing part 50 packages the arc-shaped chamfered surface 81.
It can be understood that an arc-shaped chamfered surface 81 is also provided between the second side surface and the third side surface of the cell body 80, and the two corner seal parts 50 of the packaging bag correspond to the two arc-shaped chamfered surfaces 81 on the cell body 80 one to one, respectively, and since the structures of the two corner seal parts 50 are also the same in a normal situation, the following embodiments all describe the technical solution of the embodiment of the present application with the corner seal part 50 between the first side surface and the second side surface.
In the embodiment of the present application, the corner seal 50 and the side seal 60 are both curved in a direction perpendicular to the first sealing surface 10 to form an arc surface, an outline of the arc surface is approximately the same as an outline of the arc-shaped chamfered surface 81, and when the battery cell body 80 is accommodated in the accommodating groove, the arc surface of the corner seal 50 can seal the arc-shaped chamfered surface 81. The angle of the arc surface of the angle sealing part 50 depends on the radian of the angular position of the battery cell body 80, and the value range of the angle should be larger than 0 degree and smaller than 180 degrees in a general case, and the preferable value range should be larger than 0 degree and smaller than 90 degrees. It can be understood that, when the outline of the corner seal 50 is the same as the arc-shaped chamfered surface 81, the distance from each point on the arc-shaped chamfered surface 81 to the corner seal 50 can be the same, so as to increase the volume of the cell body 80 or reduce the external dimension of the packaging bag to the maximum extent, so as to improve the energy density of the electrochemical device 100.
Referring to fig. 1, the tabs 70 of the battery cell body 80 extend from the top surface of the battery cell body 80, the tabs 70 are metal conductors leading positive and negative electrodes out of the battery cell body 80, in a popular way, the tabs of the positive and negative electrodes of the lithium battery are contact points during charging and discharging, the tabs 70 include a positive tab 70 and a negative tab 70, the positive tab 70 can be made of aluminum material, the negative tab 70 can be made of nickel or copper nickel-plated material, the tabs 70 are formed by combining two parts, namely a film and a metal band, the film is an insulating part on the tabs 70, and is used for preventing short circuit between the metal band and an aluminum-plastic film when the electrochemical device 100 is packaged, and is bonded with a packaging bag through heating and hot melt sealing to prevent liquid leakage during packaging.
In some embodiments, referring to fig. 1-3, the side seal 60 includes a first portion 61 and a second portion 62 connected together. The first portion 61 is connected to the second package side 30, the second portion 62 is connected to the corner seal 50, the first portion 61, the second portion 62 and the corner seal 50 are stacked in sequence, and the second portion at least partially overlaps the corner seal 50. After the corner seal 50 and the side seal 60 are both bent in a direction perpendicular to the first package surface 10, the first portion 61 is exposed outside the first package side 20, the second portion 62 overlaps the corner seal 50, and the second portion 62 can be adhered and fixed to the outer surface of the overlapping portion of the corner seal 50. The stacking of the first portion 61, the second portion 62, and the corner seal 50 in this order reduces the overall size of the electrochemical device 100, thereby increasing the energy density of the electrochemical device 100.
In some embodiments, the second portion 62 and the corner seal 50 are secured by an encapsulating adhesive that both secures the second portion 62 to the corner seal 50 and seals the gap between the second portion and the corner seal 50 to ensure the structural integrity of the electrochemical device 100.
Further, in some embodiments, the overlapping portion of the second portion 62 and the corner seal 50 is shaped as an isosceles triangle. Referring to fig. 3, taking the packaging bag as a rectangular shape as an example, when the corner seal 50 and the side seal 60 are not bent toward the first surface, the corner seal 50 is triangular, when the included angle between the folding line of the corner seal 50 and the second package side 30 is 45 degrees, two right-angled sides of the corner seal 50 are perpendicular to the first package side 20 and the second package side 30, respectively, and the corner seal 50 is in the shape of a right isosceles triangle. The side sealing edge 60 is connected to the first package surface 10, the side sealing edge 60 is perpendicular to the second package surface, when the side sealing edge 60 is bent in a direction perpendicular to the first package surface 10, the second portion 62 of the side sealing edge 60 is an isosceles triangle, and when the side sealing edge 60 is completely attached to the corner sealing portion 50, the overlapped isosceles triangle is completely attached to the corner sealing portion 50, so that the second portion 62 and the corner sealing portion 50 are fixed by package glue, and the sealing performance of the electrochemical device 100 structure is ensured; meanwhile, the angle between the folding line of the corner seal 50 and the second package side 30 is 45 degrees, which is also convenient for the corner seal 50 to be folded, the overlapped part can be completely attached to the side sealing edge 60, and is also convenient for the side sealing edge 60 to be folded.
It should be noted that when the included angle between the folding line of the corner seal 50 and the second package side 30 is greater than or less than 45 degrees, the folded edge portion is thickened, for example, when the included angle is greater than 45 degrees, the side sealing edge 60 is thickened after the corner seal 50 and the side sealing edge 60 are folded; less than 45 degrees may thicken the bottom edge of the electrochemical device 100, which may not be easily folded.
In some embodiments, referring to fig. 1 and 2, the side sealing edge 60 is connected to the outer surface of the first package side surface 20, and when the corner sealing portion 50 and the side sealing edge 60 are both bent towards a direction perpendicular to the first package surface 10, the bent portion of the side sealing edge 60 is attached to the first package side surface 20. The side sealing edge 60 of the electrochemical device 100 is usually bent to reduce its outer size as much as possible, and the side sealing edge 60 is usually bent at the connection point with the first packaging side 20 to make the side sealing edge 60 completely attached to the outer surface of the first packaging side 20 to the maximum extent, so as to reduce the outer size of the electrochemical device 100.
In some embodiments, taking the square electrochemical device 100 as an example, the first surface and the second surface of the cell body 80 are disposed opposite to each other, the first surface is connected to the first side surface, the second side surface and one side of the arc-shaped chamfered surface 81, and the second surface is connected to the first side surface, the second side surface and one side of the arc-shaped chamfered surface 81. In a direction perpendicular to the first package surface 10 and the second package surface, the perpendicular distance from the first package surface 10 to the side sealing edge 60 is not more than 20 micrometers, and/or the perpendicular distance from the second package surface to the side sealing edge 60 is not more than 20 micrometers. In order to reduce the external dimensions of the electrochemical device 100, the heights of the corner sealing part 50 and the side sealing edge 60 should be set to be the same as much as possible after the corner sealing part and the side sealing edge are bent, and in general, the bent side sealing edge 60 does not exceed 20 micrometers of the overall thickness of the electrochemical device 100, where the overall thickness of the electrochemical device 100 refers to the vertical distance from the first surface to the second surface, that is, the bent side sealing edge 60 does not exceed 20 micrometers of the first sealing surface and the second sealing surface along the thickness direction of the electrochemical device 100. It is understood that, when the size exceeds the above 20 μm, the excess portion is cut out or folded to ensure a small outer size of the electrochemical device 100. Note that the portion after the edge folding needs to be glued or glue-dropped for edge folding.
Further, in some embodiments, the side sealing edge 60 does not protrude from the first and second package surfaces 10 and 10 in a direction perpendicular to the first and second package surfaces, and in order to ensure that the electrochemical device 100 has a smaller external dimension, a portion of the side sealing edge 60 protruding beyond the first and second package surfaces 10 and 60 after being bent may also be cut so that the side sealing edge 60 does not protrude from the first and second package surfaces 10 and 10. Based on the same inventive concept, the perpendicular distance from the first package surface 10 to the corner seal 50 in a direction perpendicular to the first package surface 10 and the second package surface is no more than 20 microns, and/or the perpendicular distance from the second package surface to the corner seal 50 is no more than 20 microns. Similarly, portions of the corner seal 50 exceeding 20 microns may also be cut or hemmed; in order to ensure that the electrochemical device 100 has a small external dimension, the portion of the corner seal 50 beyond the first package surface 10 and the second package surface after bending may be cut or folded, so that the corner seal 50 does not protrude from the first package surface 10 and the second package surface in a direction perpendicular to the first package surface 10 and the second package surface after bending.
It should be noted that, after bending, no matter whether the corner seal 50 and the side seal 60 exceed the first package surface 10 and the second package surface by 20 micrometers, it is necessary to ensure that the height of the corner seal 50 and the height of the side seal 60 are the same after bending as much as possible, so as to facilitate the operation of applying the package adhesive and ensure the aesthetic appearance of the electrochemical device 100.
The embodiment of the application provides an electrochemical device 100, angle sealing portion 50 and side seal 60 all buckle along the direction of the first encapsulation surface 10 of perpendicular to, and the surface of angle sealing portion 50 is the convex cambered surface outward, the cambered surface does not bulge in first encapsulation side 20 and second encapsulation side 30, to the electric core body 80 that has arc chamfer face 81, can make angle sealing portion 50 encapsulate the arc chamfer face 81 of electric core body 80, the cambered surface and the arc chamfer face 81 looks adaptation of angle sealing portion 50, in order to improve the space utilization of electric core body 80 to accepting the chamber, thereby improve electrochemical device 100's energy density.
In a second aspect, an embodiment of the present application further provides a battery module, including the electrochemical device 100 of the above embodiment, and a plurality of the electrochemical devices 100 of the above embodiments are combined to form the battery module, so that the battery module of the above embodiment has a relatively high endurance due to the relatively high energy density of the battery module.
In a third aspect, an embodiment of the present application further provides an electric device, where the electrochemical device 100 of the foregoing embodiment or the battery module of the foregoing embodiment may be applied to an electric device in this embodiment, and the electric device includes a mobile phone, a tablet, a notebook computer, an electric vehicle, and other products. The electrochemical device 100 or the battery module of the electric equipment using the electrochemical device 100 or the battery module has higher energy density, so that the electric equipment has stronger cruising ability.
In a fourth aspect, embodiments of the present application further provide a method for manufacturing the electrochemical device 100 of the above embodiments, please refer to fig. 5, where the method includes:
s100, providing a cell body 80, where the cell body 80 has a first package surface 10 and an arc-shaped chamfered surface 81. The battery cell body 80 includes a first surface, a first side surface, a second side surface, and an arc-shaped chamfer surface 81, the first side surface and the second side surface are respectively connected to two adjacent edges of the first surface, and the arc-shaped chamfer surface 81 is respectively connected to the first side surface and the second side surface.
The battery cell body 80 may have a square structure, and the battery cell body 80 further includes a second surface, a third side surface and a top surface, wherein the first side surface and the second side surface, and the second side surface and the third side surface are provided with arc-shaped chamfered surfaces 81.
S200, providing a packaging bag, wherein the packaging bag is provided with a corner sealing part 50 and a side sealing edge 60, and comprises an upper packaging shell and a lower packaging shell.
And S300, placing the battery cell body 80 into the packaging bag. Specifically, the battery cell body 80 is placed between the upper packaging case and the lower packaging case and the edges of the upper packaging case and the lower packaging case are heat-sealed, and the upper packaging case and the lower packaging case together form a packaging bag. The packaging bag further comprises a first packaging side face 20, a second packaging side face 30, a corner sealing part 50 and a side sealing edge 60, wherein the first packaging surface 10 is used for packaging the first surface, the first packaging side face 20 is used for packaging the first side face, the second packaging side face 30 is used for packaging the second side face, the side sealing edge 60 is connected with the second packaging side face 30, and the corner sealing part 50 is respectively connected with the first packaging side face 20 and the second packaging side face 30.
S400, bending the corner seal 50 and the side seal 60 in a direction perpendicular to the first package surface 10, and bonding the corner seal 50 and the side seal 60. Wherein, the outer surface of the corner sealing part 50 is an outwardly protruding arc surface.
S500, the corner sealing portion 50 encapsulates the arc-shaped chamfered surface 81 of the battery cell body 80.
It should be noted that, in order to increase the energy density of the electrochemical device 100, the corner seal 50 has an arc shape and does not protrude from the first package side 20 and the second package side 30, and similarly, the other corner seal 50 does not protrude from the third package side 40 and the second package side 30. It will be appreciated that the corner seal 50 and side seal 60 may also be folded in a direction parallel to the curved chamfered surface 81 in order to facilitate the corner seal 50 corresponding to the contour of the curved chamfered surface 81.
In some embodiments, referring to fig. 6, the step of bending the corner seal 50 and the side seal 60 along a direction perpendicular to the first package surface 10 and bonding the corner seal 50 and the side seal 60 further includes:
and S410, determining the center point of the cambered surface.
And S420, determining a cambered surface tangent line passing through the central point of the cambered surface.
S430, bending the corner sealing portion 50 along a direction perpendicular to the first package surface 10 according to the tangent of the arc.
S440, the side seals 60 are bent in a direction perpendicular to the first package surface 10 such that the side seals 60 and the corner seals 50 partially overlap.
And S450, bonding the corner sealing part 50 and the side sealing edge 60.
To facilitate the description of the above method, please refer to fig. 2-4, and fig. 3 (1) is a schematic diagram of a packaging bag, wherein the right side of the L line is a side sealing edge 60, an arc surface M can be preset on the packaging bag according to the arc-shaped chamfer surface 81 of the battery cell body 80, and the bending line of the corner sealing portion 50 is determined according to the tangent line of the preset arc surface M. It should be noted that, for facilitating the bending of the corner seal 50, please refer to fig. 1 and 4 in fig. 3, a center point a of the predetermined arc surface is determined, and a tangent N passing through the center point a is selected as the bending line of the corner seal 50. It is understood that if the tangent lines above or below the center point a are selected to make the corner seal 50 bend, the bottom of the side seal 60 or the second package side 30 thicken, which increases the thickness of the bottom of the side seal 60 and the second package side 30, and is not favorable for folding the corner seal 50 and the side seal 60, therefore, in the present embodiment, the tangent line N passing through the predetermined arc center point a is preferably selected, and the tangent line N intersects with the second package side 30 at the point e.
Referring to fig. 3 (2), the corner sealing portion 50 is bent along the tangent line N in a direction perpendicular to the first package surface 10, for convenience of understanding, in this embodiment, the corner sealing portion 50 is folded to be attached to the first package surface 10, and then the corner sealing portion 50 is turned outwards to be perpendicular to the first package surface 10.
It can be seen that in fig. 3 (2), the corner seal 50 and the side seal 60 partially overlap, the overlap being a triangle bcd, which is an isosceles right triangle, it being understood that the overlap can be part of the corner seal 50 or the second portion 62 of the side seal 60.
Referring to fig. 3 (3), the side sealing edge 60 is bent along the straight line L in a direction perpendicular to the first sealing surface 10, and the side sealing edge 60 partially overlaps the corner sealing portion 50, it can be seen that the overlapping portion is an isosceles triangle bcd, and the second portion 62 of the side sealing edge 60 is an isosceles triangle, and after the side sealing edge 60 and the corner sealing portion 50 are completely attached, the isosceles triangle of the overlapping portion is completely attached to the corner sealing portion 50, so that the second portion 62 and the corner sealing portion 50 are fixed by the sealing adhesive, and the sealing performance of the structure of the electrochemical device 100 is ensured.
After the corner sealing part 50 is partially attached to the side sealing edge 60, the corner sealing part 50 and the side sealing edge 60 can be bonded by packaging glue, because the first packaging side surface 20 of the side sealing edge 60 is fixed, when the corner sealing part 50 and the side sealing edge 60 are bonded, the intersection point e of the corner sealing part 50 and the second packaging side surface 30 can move leftwards, and the outer surface of the corner sealing part 50 can form an arc surface which is used for packaging the arc-shaped chamfer surface 81 of the battery cell body 80, generally, the arc surface is similar to the arc-shaped chamfer surface 81 of the battery cell body, so that the distances between the corner sealing part 50 and the arc-shaped chamfer surface 81 are equal as much as possible, the battery cell body 80 fully utilizes the space for accommodating the cavity, and the energy density of the electrochemical device 100 is improved.
The effect after the folding is as shown in fig. 3 (4), and also refer to fig. 1 or 2 directly, it can be seen that after the folding is completed, the arc-shaped chamfer surface 81 of the electric core body 80 corresponds to the corner seal part 50 of the packaging bag in an arc shape.
In the manufacturing method of the embodiment of the application, the angle sealing part 50 and the side sealing edge 60 are both bent along the direction perpendicular to the first packaging surface 10, so that the outer surface of the angle sealing part 50 is an outward convex arc surface, the angle sealing part 50 can be used for packaging the arc-shaped chamfer surface 81 of the battery cell body 80, and the arc surface of the angle sealing part 50 is matched with the arc-shaped chamfer surface 81, so that the space utilization rate of the battery cell body 80 for the accommodating cavity is improved, and the energy density of the electrochemical device 100 is improved; meanwhile, the folding process is simple and convenient by adopting two times of folding, and the packaging bag is convenient to seal.
It should be noted that the description of the present application and the accompanying drawings set forth preferred embodiments of the present application, however, the present application may be embodied in many different forms and is not limited to the embodiments described in the present application, which are not intended as additional limitations to the present application, but are provided for the purpose of providing a more thorough understanding of the present disclosure. Moreover, the above-mentioned technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope described in the present specification; further, modifications and variations may occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
Claims (15)
1. An electrochemical device comprises a packaging bag, wherein the packaging bag comprises a first packaging surface, a first packaging side surface and a second packaging side surface, the first packaging side surface and the second packaging side surface are respectively connected to two adjacent side edges of the first packaging surface, and the packaging bag is characterized by further comprising a corner sealing part and a side sealing edge;
the corner sealing part is respectively connected with the first packaging side surface and the second packaging side surface;
the side sealing edge is connected to the first packaging side face;
the angle sealing part and the side sealing edge are bent along the direction perpendicular to the first packaging surface, the outer surface of the angle sealing part is an outward convex arc surface, and the arc surface does not protrude from the first packaging side surface and the second packaging side surface.
2. The electrochemical device of claim 1, further comprising a cell body;
the battery cell body is accommodated in the packaging bag and comprises a first surface, a first side surface, a second side surface and an arc-shaped chamfer surface;
the first side surface and the second side surface are respectively connected to two adjacent edges of the first surface, and the arc-shaped chamfer surface is respectively connected with the first side surface and the second side surface;
the first surface is packaged by the first packaging surface, the first side surface is packaged by the first packaging side surface, the second side surface is packaged by the second packaging side surface, the outline of the corner sealing part is matched with the arc-shaped chamfer surface, and the arc-shaped chamfer surface is packaged by the corner sealing part.
3. The electrochemical device of claim 1, wherein the side seal edge comprises a first portion and a second portion that are joined;
the first portion is connected with the second package side face, the second portion is connected with the corner sealing portion, the first portion, the second portion and the corner sealing portion are sequentially overlapped, and the second portion at least partially overlaps the corner sealing portion.
4. The electrochemical device of claim 3, further comprising an encapsulant;
the packaging adhesive is used for fixing the corner sealing part and the second part.
5. The electrochemical device of claim 3, wherein the overlapping portion of the second portion and the corner seal is shaped as an isosceles triangle.
6. The electrochemical device of claim 1, wherein the bent portion of the side seal edge is adhered to the side of the first package.
7. The electrochemical device of claim 2, wherein the cell body further comprises a second surface;
the second surface is opposite to the first surface, the first surface is respectively connected with the first side surface, the second side surface and one side of the arc-shaped chamfer surface, and the second surface is respectively connected with the first side surface, the second side surface and the other side of the arc-shaped chamfer surface;
the package also includes a second package surface, the second package surface encapsulating the second surface;
a vertical distance from the first package surface to the side seal edge in a direction perpendicular to the first package surface and the second package surface is no more than 20 microns, and/or a vertical distance from the second package surface to the side seal edge is no more than 20 microns.
8. The electrochemical device as claimed in claim 7, wherein the side sealing edge does not protrude from the first and second package surfaces in a direction perpendicular to the first and second package surfaces.
9. The electrochemical device of claim 7, wherein a perpendicular distance from the first package surface to the corner seal is no more than 20 micrometers and/or a perpendicular distance from the second package surface to the corner seal is no more than 20 micrometers in a direction perpendicular to the first package surface and the second package surface.
10. The electrochemical device of claim 9, wherein the corner seal does not protrude from the first and second package surfaces in a direction perpendicular to the first and second package surfaces.
11. A battery module comprising the electrochemical device according to any one of claims 1 to 10.
12. An electric device characterized by comprising the battery module according to claim 11.
13. A method of manufacturing an electrochemical device according to any one of claims 1 to 10, comprising:
providing a cell body, wherein the cell body is provided with a first packaging surface and an arc-shaped chamfer surface;
providing a package having a corner seal and a side seal;
the battery cell body is placed into the packaging bag;
bending the corner seal part and the side seal edge along a direction perpendicular to the first packaging surface and bonding the corner seal part and the side seal edge; the outer surface of the corner sealing part is an outwards protruding cambered surface;
the angle sealing part encapsulates the arc-shaped chamfer surface of the battery cell body.
14. The method of claim 13, wherein the cell body further comprises a first surface, a first side surface and a second side surface, the first side surface and the second side surface are respectively connected to two adjacent edges of the first surface, and the arc-shaped chamfer surfaces are respectively connected to the first side surface and the second side surface;
will the electricity core body is put into the wrapping bag includes:
the packaging bag comprises an upper packaging shell and a lower packaging shell, the battery cell body is placed between the upper packaging shell and the lower packaging shell, and the edges of the upper packaging shell and the lower packaging shell are heat-sealed; go up the packing carton and constitute jointly with lower packing carton the wrapping bag, wherein, the wrapping bag still includes first encapsulation side, second encapsulation side, angle banding portion and side seal, first encapsulation surface package the first surface, first encapsulation side encapsulation first side, second encapsulation side encapsulation the second side, the side seal with second encapsulation side is connected, angle banding portion is connected with first encapsulation side and second encapsulation side respectively.
15. The method of claim 14, wherein the step of bending and bonding the corner and side seals in a direction perpendicular to the first package surface further comprises:
determining a center point of the cambered surface;
determining a tangent of the arc surface passing through a center point of the arc surface;
bending the corner sealing part along the direction vertical to the first packaging surface according to the tangent;
bending the side seal edge in a direction perpendicular to the first package surface such that the side seal edge and the corner seal portion overlap;
and bonding the corner sealing part and the side sealing edge.
Priority Applications (1)
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| CN202111415414.7A CN114188597A (en) | 2021-11-25 | 2021-11-25 | Electrochemical device, battery module and electric equipment |
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| CN202111415414.7A CN114188597A (en) | 2021-11-25 | 2021-11-25 | Electrochemical device, battery module and electric equipment |
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