CN112510240A - Secondary battery and terminal device - Google Patents
Secondary battery and terminal device Download PDFInfo
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- CN112510240A CN112510240A CN202011373781.0A CN202011373781A CN112510240A CN 112510240 A CN112510240 A CN 112510240A CN 202011373781 A CN202011373781 A CN 202011373781A CN 112510240 A CN112510240 A CN 112510240A
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- Prior art keywords
- cell body
- edge
- secondary battery
- sealing edge
- top wall
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- 238000007789 sealing Methods 0.000 claims abstract description 98
- 210000005056 cell body Anatomy 0.000 claims abstract description 94
- 238000004806 packaging method and process Methods 0.000 claims abstract description 34
- 210000005069 ears Anatomy 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 5
- 239000012785 packaging film Substances 0.000 description 21
- 229920006280 packaging film Polymers 0.000 description 21
- 230000001681 protective effect Effects 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 238000000465 moulding Methods 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 5
- 239000013543 active substance Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 4
- 230000007306 turnover Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model provides a secondary battery and terminal equipment, secondary battery include electric core body, wrapping bag, first utmost point ear and protection shield. The packaging bag comprises a main body part, a first sealing edge and a second sealing edge; the battery cell body is accommodated in the main body part comprising the top wall and the side wall, the first sealing edge is connected with the top wall and is fixed on the top wall in a bending mode, and the second sealing edge is connected with the side wall and is fixed on the side wall in a bending mode. The packaging bag comprises a connecting part for connecting the first sealed edge and the second sealed edge, the connecting part is provided with a first connecting end connected with the first sealed edge and a second connecting end connected with the second sealed edge, and a protruding part protruding outwards along the width direction of the battery cell body is formed between the first connecting end and the second connecting end; first utmost point ear is connected in electric core body, passes the second banding and extends to the outside of wrapping bag, and the protection shield sets up in the surface of second banding, and the protection shield is connected with first utmost point ear. The space occupation that the protruding portion arouses is also effectively utilized by the protection shield, improves the space utilization of battery, promotes battery capacity.
Description
Technical Field
The present disclosure relates to the field of batteries, and particularly to a secondary battery and a terminal device.
Background
At present, with the vigorous development of electronic products, the demand for the capacity improvement of secondary batteries is higher and higher. There are various ways to increase the battery capacity, such as increasing the activity of the electrode material, but as the actual specific energy of the electrode material gets closer to the theoretical value, there is no room to improve the electrode material; the specific energy of the electrode material can be improved by using the novel composite material, and the application is not mature at the experimental stage at present; the battery generally comprises an internal battery core body and an external packaging bag, and reasonable packaging of the packaging bag is crucial to improving the battery capacity.
Disclosure of Invention
In view of the defects in the prior art, an object of the present disclosure is to provide a secondary battery and a terminal device, which can make full use of the width direction space of a cell body and effectively save the length direction space of the cell body, thereby improving the battery capacity.
In order to achieve the above object, in one aspect, the present disclosure provides a secondary battery including a cell body, a packing bag, a first tab, and a protection plate. The packaging bag comprises a main body part, a first sealing edge and a second sealing edge; the battery cell body is accommodated in the main body part, the main body part comprises a top wall and a side wall, the top wall is positioned on one side of the battery cell body along the length direction of the battery cell body, and the side wall is positioned on one side of the battery cell body along the width direction of the battery cell body; the first sealing edge is connected with the top wall and is bent and fixed on the top wall, and the second sealing edge is connected with the side wall and is bent and fixed on the side wall; the packaging bag further comprises a connecting part for connecting the first sealing edge and the second sealing edge, the connecting part is provided with a first connecting end connected with the first sealing edge and a second connecting end connected with the second sealing edge, a protruding part is formed between the first connecting end and the second connecting end, and the protruding part protrudes outwards along the width direction of the battery cell body; first utmost point ear connect in electricity core body, pass the second banding extends to the outside of wrapping bag, the protection shield set up in on the surface of second banding, just the protection shield with first utmost point ear is connected.
In one embodiment, a protrusion height of the protrusion in the width direction of the cell body is lower than an outer surface of the protection plate in the width direction of the cell body.
In one embodiment, the number of the second sealing edges is two, the number of the first tabs is two, the first tabs penetrate through two of the second sealing edges and extend to the outside of the packaging bag, or the first tabs penetrate through two of the second sealing edges and extend to the outside of the packaging bag.
In an embodiment, the connection portion includes a first folding area and a second folding area connected to each other, the first folding area is connected to the first sealing edge through the first connection end, and the second folding area is connected to the second sealing edge through the second connection end.
In an embodiment, the main body further includes a first surface and a second surface, and the first surface and the second surface are disposed opposite to each other along a thickness direction of the cell body; the second edge seal extending toward the first surface and the first edge seal extending toward the second surface; the first folding area is bent from the first connecting end to one side of the first sealing edge far away from the top wall, and the second folding area is bent from the second connecting end towards the top wall.
In an embodiment, the main body further includes a first surface and a second surface, and the first surface and the second surface are disposed opposite to each other along a thickness direction of the cell body; the second edge seal extending toward the first surface and the first edge seal extending toward the first surface; the first turnover area is bent from the first connecting end to one side of the first sealing edge close to the top wall, and the second turnover area is bent from the second connecting end to be between the first turnover area and the top wall.
In one embodiment, the first tab extends from the second sealed edge and is reversely bent to be connected with the protection plate.
In an embodiment, the main body further includes a first surface and a second surface, and the first surface and the second surface are disposed opposite to each other along a thickness direction of the cell body; the protrusion is located between the first surface and the second surface, and the protection plate is located between the first surface and the second surface.
In an embodiment, the secondary battery further includes a second tab connected to the cell body, passing through the first sealing edge, and extending to the outside of the packaging bag.
In order to achieve the above object, in another aspect, the present disclosure provides a terminal device including the aforementioned secondary battery.
The beneficial effects of this disclosure are as follows:
in the secondary battery according to the present disclosure, the first sealing edge of the packaging bag is fixed to the top wall of the main body portion in a bent manner, the second sealing edge is fixed to the side wall of the main body portion in a bent manner, the first sealing edge and the second sealing edge are connected by the connecting portion, the connecting portion is connected with the first sealing edge and the second sealing edge to form the protruding portion, the protruding portion occupies the packaging space in the width direction of the battery cell body as the protruding portion protrudes outward in the width direction of the battery cell body, the protective plate connected to the first tab is disposed on the outer surface of the second sealing edge, so that the protective plate also makes full use of the space in the width direction of the battery cell body, the space occupation caused by the protruding portion is also effectively utilized by the protective plate to reduce the packaging space consumed in the length direction of the battery cell body, and the space in the length direction of the battery cell body is saved, the battery cell body can provide larger available space in the length direction of the battery cell body, the space utilization rate of the battery is improved, and therefore the capacity of the battery can be improved.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a terminal device according to the present disclosure.
Fig. 2 is a perspective view of a molded secondary battery according to an embodiment of the present disclosure.
Fig. 3 is a plan view of an embodiment of the secondary battery of fig. 2.
Fig. 4 is a front view of an embodiment of the secondary battery of fig. 2.
Fig. 5 is a perspective view of the embodiment of the secondary battery of fig. 2 after molding, viewed from another angle.
Fig. 6 is a perspective view of the embodiment of the secondary battery of fig. 2 after molding, viewed from a further angle.
Fig. 7 is a schematic view of the embodiment of the secondary battery of fig. 2 before molding.
Fig. 8 is another schematic view of the embodiment of the secondary battery of fig. 2 before molding.
Fig. 9 is a front view of an embodiment of the secondary battery of fig. 8.
Fig. 10 is still another schematic view of the embodiment of the secondary battery of fig. 2 before molding.
Fig. 11 is a perspective view of a molded secondary battery according to another embodiment of the present disclosure.
Fig. 12 is a perspective view of a secondary battery according to still another embodiment of the present disclosure after molding.
Fig. 13 is a perspective view of a secondary battery according to still another embodiment of the present disclosure after molding.
Fig. 14 is a perspective view of a molded secondary battery according to still another embodiment of the present disclosure, showing a protective plate.
Fig. 15 is another perspective view of the embodiment of the secondary battery of fig. 14, wherein the protection plate is not shown.
Wherein the reference numerals are as follows:
200 second edge sealing of mobile phone 23
100 secondary battery 24 connection part
1 cell body 24a first connection end
2 packaging bag 24b second connecting end
2a first packaging film 241 first folded area
S1 first cavity 242 second turnover area
2b second packaging film 25 projection
S2 first tab of second inner cavity 3
21 main body part 4 protective plate
211 first surface 5 second pole ear
212 second surface 6 conductive connection pad
Width direction of 213 top wall X electric core body
Length direction of 214 side wall Y electric core body
22 thickness direction of first edge sealing Z-shaped cell body
Detailed Description
The accompanying drawings illustrate embodiments of the present disclosure and it is to be understood that the disclosed embodiments are merely examples of the disclosure, which can be embodied in various forms, and therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure.
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure.
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 disclosure belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure; the terms "including" and "having," and any variations thereof, in the description and claims of this disclosure and the description of the above figures are intended to cover non-exclusive inclusions. In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and the like in the description and claims of the present disclosure or in the above-described drawings are used for distinguishing between different objects, and are not intended to describe a particular order or primary-secondary relationship, nor are they to be construed as indicating or implying relative importance. The terms "connected" and "coupled" are used broadly and include, for example, "connected" and "coupled" as well as both fixed and removable or integral or electrical or signal connections; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The presence of "a plurality" in this disclosure means more than two (including two).
The present disclosure is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The secondary battery described in the embodiments of the present disclosure is suitable for various terminal devices using the secondary battery, for example, mobile phones, portable devices, smart wearable devices, notebook computers, battery cars, electric vehicles, ships, spacecraft, electric toys, electric tools, and the like. The secondary battery supplies power to the terminal device. The secondary battery described in the embodiments of the present disclosure is not limited to be applied to the terminal device described above, but may be applied to all terminal devices using the secondary battery. For example, fig. 1 shows a structure of a mobile phone 200, wherein a secondary battery 100 is disposed inside the mobile phone 200, and the secondary battery 100 supplies power to the mobile phone 200 to meet the power demand when the mobile phone 200 is used.
Referring to the examples illustrated in fig. 2 to 15, the secondary battery of the present disclosure includes a cell body 1, a packaging bag 2, a first tab 3, and a protective plate 4.
The cell body 1 is a core member of the secondary battery 100 that realizes the charge and discharge functions. The battery cell body 1 comprises a positive pole piece, a negative pole piece and a diaphragm separating the positive pole piece from the negative pole piece. The positive pole piece comprises a positive current collector and a positive active substance layer coated on the surface of the positive current collector, the positive current collector can be an aluminum foil, and the positive active substance layer comprises a ternary material, lithium manganate or lithium iron phosphate. The negative pole piece comprises a negative current collector and a negative active substance layer coated on the surface of the negative current collector, the negative current collector can be a copper foil, and the negative active substance layer comprises graphite or silicon.
The cell body 1 may have a laminated structure. Specifically, the positive electrode plates are provided in plurality, the negative electrode plates are provided in plurality, the positive electrode plates and the negative electrode plates are alternately stacked in the thickness direction Z of the cell body 1, and the positive electrode plates and the negative electrode plates are separated by the diaphragm.
Alternatively, the cell body 1 may also be a winding structure. Specifically, the positive electrode plate and the negative electrode plate are both one, and the positive electrode plate and the negative electrode plate are in a belt-shaped structure. The positive electrode plate, the diaphragm and the negative electrode plate are sequentially stacked and wound for more than two turns to form the cell body 1. The cell body 1 may be flat.
Referring to the example shown in fig. 7, the packaging bag 2 includes a first packaging film 2a and a second packaging film 2b, and the cell body 1 is disposed between the first packaging film 2a and the second packaging film 2 b. The first packaging film 2a and the second packaging film 2b are arranged up and down in the thickness direction Z of the cell body 1.
The first packaging film 2a has a first inner cavity S1, and the cell body 1 is at least partially accommodated in the first inner cavity S1. The first inner cavity S1 may be formed by drawing the first wrapping film 2a by punching. In the embodiment shown in fig. 7, the second packaging film 2b is formed into the second inner cavity S2 by punching, a part of the cell body 1 is accommodated in the first inner cavity S1, and another part of the cell body 1 is accommodated in the second inner cavity S2. In an alternative embodiment, the second packaging film 2b may be flat.
The first packaging film 2a and the second packaging film 2b may be provided integrally or separately. For example, the first wrapping film 2a and the second wrapping film 2b may be formed by folding a sheet of wrapping film (e.g., aluminum plastic film, steel plastic film, etc.). Specifically, referring to fig. 7, two cavities may be formed in the one sheet of packaging film by punching, and then the one sheet of packaging film is bent into two layers, i.e., a first packaging film 2a and a second packaging film 2b of the present application are formed. The two cavities are respectively the first cavity S1 of the first packaging film 2a and the second cavity S2 of the second packaging film 2 b. The cell body 1 is disposed between the first packaging film 21 and the second packaging film 22, and the two cavities enclose a space for accommodating the cell body 1.
Referring to fig. 2 to 15, the package 2 includes a main body 21, a first sealed edge 22 and a second sealed edge 23. The cell body 1 is accommodated in the main body portion 21. The body portion 21 may include a first surface 211, a second surface 212, a top wall 213, and a side wall 214. The first surface 211 and the second surface 212 are arranged opposite to each other in the thickness direction Z of the cell body 1. The top wall 213 is located on one side of the cell body 1 along the length direction Y of the cell body 1, and the side wall 214 is located on one side of the cell body 1 along the width direction X of the cell body 1. The first sealing edge 22 is connected with the top wall 213 and is bent and fixed on the top wall 213, and the second sealing edge 23 is connected with the side wall 214 and is bent and fixed on the side wall 214. The package 2 further comprises a connecting portion 24 connecting the first sealed edge 22 and the second sealed edge 23. The connecting portion 24 has a first connecting end 24a connected to the first sealing edge 22 and a second connecting end 24b connected to the second sealing edge 23, a protruding portion 25 is formed between the first connecting end 24a and the second connecting end 24b, and the protruding portion 25 protrudes outward in the width direction X of the cell body 1.
Referring to fig. 2 to 15, the first tab 3 is connected to the cell body 1, passes through the second sealed edge 23, and extends to the outside of the packaging bag 2. Specifically, the number of the first tabs 3 may be two, one first tab 3 is connected to the positive current collector of the positive electrode plate, and the other first tab 3 is connected to the negative current collector of the negative electrode plate. The two first tabs 3 connect the cell body 1 with a member, such as a protective plate 4, outside the packaging bag 2, thereby achieving charging and discharging of the cell body 1. The material of the first tab 3 may be aluminum, nickel or copper plated nickel.
Referring to fig. 2 to 6 and 11 to 15, the protection plate 4 is disposed on the outer surface of the second sealing edge 23, and the protection plate 4 is connected to the first tab 3. The outer surface of the second sealing edge 23 refers to the surface of the second sealing edge 23 away from the sidewall 214 of the main body 21.
In the secondary battery according to the present disclosure, the first sealing edge 22 of the packaging bag 2 is fixed to the top wall 213 of the main body 21 in a bending manner, and the second sealing edge 23 is fixed to the side wall 214 of the main body 21 in a bending manner, the first sealing edge 22 and the second sealing edge 23 are connected by the connecting portion 24, the connecting portion 24 is connected with the first sealing edge 22 and the second sealing edge 23 to form the protruding portion 25, since the protruding portion 25 protrudes outward along the width direction X of the battery cell body 1, the protruding portion 25 occupies the packaging space in the width direction X of the battery cell body 1, by disposing the protection plate 4 connected with the first tab 3 on the outer surface of the second sealing edge 23, the protection plate 4 also makes full use of the space in the width direction X of the battery cell body 1, the space occupied by the protruding portion 25 is also effectively utilized by the protection plate 4, so as to reduce the packaging space consumed in the length direction Y of the battery cell body 1, and by avoiding the protection plate 4 occupying the space in the length direction Y of To the space of Y, for electric core body 1 provides bigger available space on its length direction Y, improves the space utilization of battery to can promote battery capacity.
Referring to fig. 2-6 and 11-15, in some embodiments, the connection portion 24 includes a first fold-over region 241 and a second fold-over region 242 connected to each other. The first folded-over region 241 is connected to the first sealing edge 22 through a first connecting end 24a, and the second folded-over region 242 is connected to the second sealing edge 23 through a second connecting end 24 b.
In particular, in the embodiments illustrated in fig. 2 to 6, 12, 13 and 14 to 15, the second sealing edge 23 extends towards the first surface 211 and the first sealing edge 22 extends towards the second surface 212. The first folded-over region 241 is folded from the first connection end 24a to a side of the first sealing edge 22 away from the top wall 213, and the second folded-over region 242 is folded from the second connection end 24b toward the top wall 213. That is to say, first banding 22 and second banding 23 are buckled and are extended with opposite direction along the thickness direction Z of electricity core body 1, through buckling first banding 22 and second banding 23 and being fixed in main part 21 with it, can save the encapsulation space, and then provide more spaces for electricity core body 1 to promote battery capacity. The first sealing edge 22 can be bent to fit the top wall 213, and the second sealing edge 23 can be bent to fit the side wall 214. Taking the embodiment of the secondary battery shown in fig. 2 to 6 as an example, fig. 7 to 10 are schematic views of the secondary battery of fig. 2 to 6 in a state before molding. Referring to fig. 2 to 10, the cell body 1 is placed in a bag (referred to as a packaging bag 2) to seal a space for accommodating the cell body 1 by hot pressing, the second sealing edge 23 is bent and extends toward the first surface 211 to be fixed to the sidewall 214, then the first sealing edge 22 is bent and extends toward the second surface 212 to be fixed to the top wall 213, the first sealing edge 22 and the second sealing edge 23 are bent and fixed to form a connecting portion 24, the protection plate 4 is disposed on the outer surface of the second sealing edge 23, and the first tab 3 is connected to the protection plate 4, so as to obtain the secondary battery embodiment shown in fig. 2 to 6. In the embodiment of the secondary battery shown in fig. 2 to 6 and 12 to 15, the connection portion 24 is connected between the first sealing edge 22 and the second sealing edge 23, the protrusion portion 25 is formed between the first connection end 24a and the second connection end 24b of the connection portion 24, and the protection plate 4 is disposed in the width direction X of the battery cell body 1 to fully utilize the packaging space in the width direction X of the battery cell body 1 and save the space in the length direction Y of the battery cell body 1, thereby improving the space utilization rate of the secondary battery.
In the embodiment shown in fig. 11, the second sealing edge 23 extends towards the first surface 211, and the first sealing edge 22 extends towards the first surface 211. The first folded-over region 241 is folded from the first connection end 24a to a side of the first sealing edge 22 close to the top wall 213, and the second folded-over region 242 is folded from the second connection end 24b between the first folded-over region 241 and the top wall 213. That is to say, first banding 22 and second banding 23 are buckled and are extended along the thickness direction Z syntropy of cell body 1, are fixed in main part 21 with it through buckling first banding 22 and second banding 23, can save the encapsulation space, and then provide more spaces for cell body 1 to promote battery capacity. The first sealing edge 22 can be bent to fit the top wall 213, and the second sealing edge 23 can be bent to fit the side wall 214. In the process of forming the secondary battery shown in fig. 11, the cell body 1 is put into a bag (referred to as a packaging bag 2) to seal the space for accommodating the cell body 1 by hot pressing, the second sealing edge 23 is bent and extends toward the first surface 211 to be fixed to the sidewall 214, then the first sealing edge 22 is bent and extends toward the first surface 211 to be fixed to the top wall 213, the first sealing edge 22 and the second sealing edge 23 are bent and fixed to form the connecting portion 24, the protective plate 4 is disposed on the outer surface of the second sealing edge 23, and the first tab 3 is connected to the protective plate 4, so as to obtain the embodiment of the secondary battery shown in fig. 11, the connecting portion 24 is connected between the first sealing edge 22 and the second sealing edge 23, the protruding portion 25 is formed between the first connecting end 24a and the second connecting end 24b of the connecting portion 24, the protective plate 4 is disposed in the width direction X of the cell body 1, so as to fully utilize the packaging space in the width direction X of the cell body 1 and save the space in the, thereby improving the space utilization of the secondary battery.
Referring to fig. 2 to 6 and 11 to 14, in some embodiments, the first sealing edge 22 is located between the first surface 211 and the second surface 212, and the second sealing edge 23 is located between the first surface 211 and the second surface 212, so that the dimensions of the first sealing edge 22 and the second sealing edge 23 in the thickness direction Z of the cell body 1 after being bent and fixed to the body 21 do not exceed the first surface 211 and the second surface 212, so as to prevent the first sealing edge 22 and the second sealing edge 23 from occupying extra space in the thickness direction Z of the cell body 1, and prevent the first sealing edge 22 and the second sealing edge 23 from being exposed out of the body 21 in the thickness direction Z of the cell body 1 and damaged by impact, thereby avoiding package failure.
Referring to fig. 2 to 15, in some embodiments, the number of the second sealing edge 23 may be two, and the number of the first tab 3 may also be two. Referring to fig. 2 to 6 and 11, in some embodiments, two first tabs 3 pass through one of the two second seals 23 and extend to the outside of the package bag 2, and a protective plate 4 is disposed on the outer surface of the one second seal 23 through which the two first tabs 3 pass and is coupled to the two first tabs 3. Referring to fig. 12 to 15, in some embodiments, two first tabs 3 pass through two second sealing rims 23 and extend to the outside of the packaging bag 2, respectively. Referring to the embodiment of fig. 12, the protection plates 4 are arranged in one arrangement, the protection plates 4 are arranged on one of the second sealing rims 23, and two first tabs 3 are connected to the same protection plate. Referring to the embodiment of fig. 13, the protection plates 4 are disposed in two, two protection plates 4 are disposed on the outer surfaces of the two second sealing rims 23, respectively, and the two first tabs 3 are coupled to the corresponding protection plates 4.
Referring to fig. 2 to 6 and 11 to 14, in some embodiments, the protrusion 25 is located between the first surface 211 and the second surface 212, and the protection plate 4 is located between the first surface 211 and the second surface 212, so as to avoid the protrusion 25 and the protection plate 4 from occupying a space in the thickness direction Z of the cell body 1, thereby improving space utilization.
Referring to fig. 2 to 4, in some embodiments, the protruding portion 25 has a protrusion height in the width direction X of the cell body 1 lower than the outer surface of the protection plate 4 in the width direction X of the cell body 1. As shown in fig. 3 and 4, h denotes a projection height of the protruding portion 25 in the width direction X of the cell body 1, that is, the projection height refers to a degree to which the protruding portion 25 protrudes outward in the width direction X of the cell body 1 with respect to the second connection end 24 b. 41 refers to an outer surface of the protection plate 4 in the width direction X of the cell body 1, and the outer surface of the protection plate 4 in the width direction X of the cell body 1 refers to a surface of the protection plate 4 away from the second sealing edge 23. In the width direction X of the cell body 1, the outer surface 41 of the protection plate 4 in the width direction X of the cell body 1 is farther away from the main body portion 21 than the protruding portion 25, and the protruding portion 25 can be protected by the protection plate 4, so the protruding portion 25 is not easily hit, and therefore the risk of damage to the packaging bag 2 due to hitting of the protruding portion 25 can be effectively prevented.
As shown in fig. 14 and 15, in some embodiments, the secondary battery may further include a second tab 5, and the second tab 5 is connected to the cell body 1, passes through the first sealing edge 22, and extends to the outside of the packaging bag 2. That is, in the secondary battery of the present application, the first tab 3 protrudes from the second sealing edge 23, and the second tab 5 may be further provided to protrude from the first sealing edge 22. The number that can set up first utmost point ear 3 is one and the quantity of second utmost point ear 5 is one, and one of them of a first utmost point ear 3 and a second utmost point ear 5 is connected in the anodal mass flow body of positive pole piece, and another connects in the negative pole mass flow body of negative pole piece, through a first utmost point ear 3 with a second utmost point ear 5 is with cell body 1 and the outside component connection such as protection shield 4 of wrapping bag 2, and then realizes the charge and discharge of cell body 1. The number of the second tabs 5 can also be set to be multiple according to actual needs. In the embodiment shown in fig. 14 and 15, the number of second pole ears 5 is two. The second tab 5 may be made of aluminum, nickel or copper plated with nickel.
Referring to fig. 2 to 6 and 11 to 14, in some embodiments, the first tab 3 protrudes from the second sealing edge 23 and may be reversely bent to be coupled with the protection plate 4. In addition, the first tab 3 is fixed on the outer surface of the circuit board 4 by reversely bending to be connected with the circuit board 4, so that the first tab 3 can be located between the first surface 211 and the second surface 212, and the first tab 3 is prevented from occupying the space along the thickness direction Z of the cell body 1, thereby improving the space utilization rate. As shown in fig. 14 and 15, the second tab 5 is extended from the first sealed edge 22 and may also be reversely bent to be connected with a member to be connected. It is noted that the protection plate 4 is not shown in fig. 15, and the first tab 3 is in an unfolded state in fig. 15, and after the protection plate 4 is fixed to the outer surface of the second sealing edge 23, the first tab 3 is reversely bent and fixed to the outer surface of the protection plate 4.
Referring to fig. 2 to 6 and 11 to 14, in some embodiments, the first tab 3 and the protection plate 4 may be connected by a conductive connection piece 6. The conductive connecting piece 6 may be U-shaped, and the U-shaped conductive connecting piece 6 holds the first tab 3 and is connected to the protection plate 4, so that the first tab 3 is connected to the protection plate 4. The conductive connection pad 6 may be a nickel pad.
The above detailed description describes exemplary embodiments, but is not intended to limit the combinations explicitly disclosed herein. Thus, unless otherwise specified, various features disclosed herein can be combined together to form a number of additional combinations that are not shown for the sake of brevity.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
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| CN202011373781.0A CN112510240B (en) | 2020-11-30 | 2020-11-30 | Secondary battery and terminal device |
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| CN202011373781.0A CN112510240B (en) | 2020-11-30 | 2020-11-30 | Secondary battery and terminal device |
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| CN112510240B CN112510240B (en) | 2021-11-09 |
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| CN112510240B (en) | 2021-11-09 |
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