Flexible and foldable thin film type lithium metal battery packaging unit

Abstract

The utility model discloses a flexible and foldable thin film type lithium metal battery packaging unit which comprises an inner ring folding battery layer and an outer ring surrounding and protecting battery layer which are connected in series, corner protection structures and soft connection structures for connecting adjacent batteries are arranged between the outer-layer first battery and the outer-layer second battery, between the outer-layer second battery and the outer-layer third battery, between the outer-layer third battery and the outer-layer fourth battery and between the outer-layer fourth battery and the outer-layer fifth battery; according to the utility model, the inner and outer ring battery layers are connected in series, and the battery units are allowed to realize multidirectional bending through soft connection structures. Compared with a traditional laminated cell with a fixed size, the structure can be subjected to form reconstruction according to an equipment space, and the matching degree of the cell capacity and the available space of the equipment is improved; the L-shaped polyether-ether-ketone insulating sheet corner protection structure is combined with the temperature-resistant epoxy resin adhesive layer to form dual protection in a folding stress concentration area, so that the service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to thin film type lithium battery technical field, concretely is a kind of flexible foldable thin film type lithium metal battery packaging unit. BACKGROUND

[0002] Traditional rigid battery is usually liquid electrolyte, relatively heavy and not easy to bend, and use is limited. Thin film type lithium battery uses flexible substrate and solid-state electrolyte, and is lighter, safer and suitable for devices with limited space, such as smart bracelets, foldable mobile phones, scroll screen devices and other electronic products that need dynamic deformation.

[0003] After searching, in the patent with the application announcement No. CN108336252A, a kind of solid-state lithium battery packaging structure is disclosed, including the blocking layer, barrier layer and protective layer of superposition, the blocking layer is PTEE film. A kind of solid-state lithium battery, including lithium battery cell and above-mentioned packaging structure, lithium battery cell includes the positive pole structure, solid-state electrolyte and negative pole structure of superposition, define the positive pole structure and the side of negative pole structure far from solid-state electrolyte in the lithium battery cell as two opposite end faces, the surface of lithium battery cell between two end faces is lithium battery cell side, blocking layer, barrier layer and protective layer are formed in the lithium battery cell side from close to lithium battery cell to far from lithium battery cell in turn, the blocking layer is PTEE film.

[0004] The lithium battery adopts stacked multilayer film packaging. Since the capacity of lithium battery is directly related to the amount of solid-state electrolyte, although the flexible lithium battery produced by laminated packaging has flexibility, the length and width are fixed. When it is installed in other devices for use after disassembly, the volume and available space may not be suitable, affecting the flexibility of use. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of flexible foldable thin film type lithium metal battery packaging unit, by setting inside and outside circle battery layer series connection, and can realize folding and unfolding, improve the degree of adaptation of volume and available space.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of flexible foldable thin film type lithium metal battery packaging unit, including inside circle folding battery layer and outside circle surrounding protective battery layer, the inside circle folding battery layer and outside circle surrounding protective battery layer series connection, the outside circle surrounding protective battery layer includes outer layer first battery, outer layer second battery, outer layer third battery, outer layer fourth battery and outer layer fifth battery;

[0007] Corner protection structure and soft interface structure for connecting adjacent batteries are provided between the outer layer first battery and the outer layer second battery, between the outer layer second battery and the outer layer third battery, between the outer layer third battery and the outer layer fourth battery, and between the outer layer fourth battery and the outer layer fifth battery.

[0008] Preferably, the corner protection structure comprises a supportable shaped insulation sheet, the cross section of the insulation sheet is arranged in L shape, and the soft joint structure is glued to the inner wall of the insulation sheet.

[0009] Preferably, the insulation sheet adopts a high-temperature-resistant and corrosion-resistant polyether ether ketone sheet, and the inner wall of the polyether ether ketone sheet is coated with an epoxy resin layer for improving adhesion.

[0010] Preferably, the inner circle folded battery layer and the outer circle surrounding protection battery layer from inside to outside of the encapsulation layer comprise an inner layer heat sealing layer, an adhesive layer, a metal barrier layer and an outer layer protection layer, and the inner layer heat sealing layer, the adhesive layer, the metal barrier layer and the outer layer protection layer are stacked in sequence.

[0011] Preferably, the inner layer heat sealing layer is arranged as a polypropylene sealing layer, the adhesive layer is arranged as an epoxy resin adhesive layer, the metal barrier layer is arranged as an aluminum foil water and oxygen barrier layer, and the outer layer protection layer is arranged as a polyethylene terephthalate protection layer.

[0012] Preferably, the soft joint structure comprises an upper polyester film layer and a lower polyester film layer, the upper polyester film layer and the lower polyester film layer cover the upper and lower surfaces of the polyethylene terephthalate protection layer respectively, and the edges of the upper polyester film layer and the lower polyester film layer are bonded by heat pressing.

[0013] Preferably, the inner circle folded battery layer comprises an inner circle first battery, an inner circle second battery, an inner circle third battery and an inner circle fourth battery, and the inner circle first battery is connected in series with the inner circle second battery, the inner circle third battery and the inner circle fourth battery.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The utility model discloses a structure of the inner circle folded battery layer and the outer circle surrounding protection battery layer, and the inner circle folded battery layer and the outer circle surrounding protection battery layer are connected in series, and the battery unit is allowed to realize multidirectional bending through the soft joint structure. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure diagram of the inner circle folded battery layer and the outer circle surrounding protection battery layer of the utility model;

[0017] Figure 2 It is the structure schematic diagram of the corner protection structure of the utility model;

[0018] Figure 3 It is the structure schematic diagram of the outer circle surrounding protection battery layer of the utility model;

[0019] Figure 4 is the structure diagram of the inner circle folding battery layer of the utility model;

[0020] Figure 5 is the structure diagram of the first battery of the inner circle of the utility model;

[0021] Figure 6 is the position diagram of the corner protection structure of the utility model;

[0022] Figure 7 is the position diagram of the connecting part of the first battery of the inner circle and the second battery of the inner circle.

[0023] In the figure: 1, the inner circle folding battery layer;2, the outer circle surrounding protection battery layer;201, the outer layer first battery;202, the outer layer second battery;203, the outer layer third battery;204, the outer layer fourth battery;205, the outer layer fifth battery;3, the corner protection structure;4, the soft joint structure;301, the insulating sheet;302, the epoxy resin layer;101, the inner layer heat sealing layer;102, the adhesive layer;103, the metal barrier layer;104, the outer layer protection layer;401, the upper polyester film layer;402, the lower polyester film layer;1011, the first battery of the inner circle;1012, the second battery of the inner circle;1013, the third battery of the inner circle;1014, the fourth battery of the inner circle;A, the positive electrode;B, the negative electrode. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0025] Please refer to Figures 1-7 The utility model provides a kind of technical solutions: a flexible foldable film type lithium metal battery packaging unit, including inner circle folding battery layer 1 and outer circle surrounding protection battery layer 2, the inner circle folding battery layer 1 and outer circle surrounding protection battery layer 2 are connected in series, the outer circle surrounding protection battery layer 2 includes outer layer first battery 201, outer layer second battery 202, outer layer third battery 203, outer layer fourth battery 204 and outer layer fifth battery 205;

[0026] The corner protection structure 3 and the soft connection structure 4 for connecting adjacent batteries are arranged between the outer layer first battery 201 and the outer layer second battery 202, between the outer layer second battery 202 and the outer layer third battery 203, between the outer layer third battery 203 and the outer layer fourth battery 204, and between the outer layer fourth battery 204 and the outer layer fifth battery 205.

[0027] By arranging the corner protection structure 3, the L-shaped cross section uniformly disperses the folding stress to the insulation sheet 301, the inner circle folding battery layer 1 is folded in the outer circle surrounding protection battery layer 2, the positive electrode A of the battery is located at one end of the outer circle surrounding protection battery layer 2, the negative electrode B of the battery is located at one end of the inner circle folding battery layer 1, and is led out through the side surface of the battery.

[0028] The corner protection structure 3 includes a supportable shaped insulation sheet 301, the cross section of the insulation sheet 301 is arranged in an L shape, and the soft connection structure 4 is glued to the inner wall of the insulation sheet 301.

[0029] The corner protection structure 3 provides support and protection for the folded corner position of the outer layer surrounding protection battery layer.

[0030] The insulation sheet 301 is made of a high-temperature-resistant and corrosion-resistant polyether ether ketone sheet, and the inner wall of the polyether ether ketone sheet is coated with an epoxy resin layer 302 to improve adhesion.

[0031] The polyether ether ketone sheet can maintain structural stability at -50℃-260℃ and resist electrolyte corrosion.

[0032] The inner circle folding battery layer 1 and the outer circle surrounding protection battery layer 2 are encapsulated from the inside to the outside, including an inner layer heat sealing layer 101, an adhesive layer 102, a metal barrier layer 103, and an outer layer protection layer 104, which are stacked in turn. The internal encapsulation of the battery is the same as that in the prior art.

[0033] The inner layer heat sealing layer 101 is arranged as a polypropylene sealing layer, the adhesive layer 102 is arranged as an epoxy resin adhesive layer, the metal barrier layer 103 is arranged as an aluminum foil water and oxygen barrier layer, and the outer layer protection layer 104 is arranged as a polyethylene terephthalate protection layer.

[0034] The soft connection structure 4 includes an upper polyester film layer 401 and a lower polyester film layer 402, which cover the upper and lower surfaces of the polyethylene terephthalate protection layer respectively, and the edges of the upper polyester film layer 401 and the lower polyester film layer 402 are bonded by heat pressing.

[0035] The battery connection uses electrode lead-out series connection, and is protected by heat-pressing and bonding through the edges of the upper polyester film layer 401 and the lower polyester film layer 402.

[0036] The inner circle folded battery layer 1 comprises an inner circle first battery 1011, an inner circle second battery 1012, an inner circle third battery 1013 and an inner circle fourth battery 1014, and the inner circle first battery 1011 is connected in series with the inner circle second battery 1012, the inner circle third battery 1013 and the inner circle fourth battery 1014.

[0037] In use, the inner circle folded battery layer 1 can be folded layer by layer, the outer circle surrounding protection battery layer 2 surrounds and shapes the inner circle folded battery layer 1, the corner protection structure 3 provides support and protection for the corner position of the folded outer layer surrounding protection battery layer, the positive electrode A of the battery is located at one end of the outer circle surrounding protection battery layer 2, the negative electrode B of the battery is located at one end of the inner circle folded battery layer 1, and is led out through the side of the battery.

[0038] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1.A flexible foldable thin film lithium metal battery packaging unit, characterized by: The inner circle folded battery layer (1) and the outer circle surrounding protection battery layer (2) are connected in series, and the outer circle surrounding protection battery layer (2) comprises an outer layer first battery (201), an outer layer second battery (202), an outer layer third battery (203), an outer layer fourth battery (204) and an outer layer fifth battery (205). The corner protection structure (3) and the soft connection structure (4) for connecting adjacent batteries are arranged between the outer layer first battery (201) and the outer layer second battery (202), between the outer layer second battery (202) and the outer layer third battery (203), between the outer layer third battery (203) and the outer layer fourth battery (204), and between the outer layer fourth battery (204) and the outer layer fifth battery (205). 2.The flexible and foldable thin film lithium metal battery packaging unit of claim 1, wherein: The corner protection structure (3) comprises a supportable shaped insulating sheet (301), and the cross section of the insulating sheet (301) is arranged in an L shape. 3.The flexible and foldable thin film lithium metal battery packaging unit of claim 2, wherein: The insulating sheet (301) is made of high-temperature-resistant and corrosion-resistant polyether ether ketone sheet, and the inner wall of the polyether ether ketone sheet is coated with an epoxy resin layer (302) to improve adhesion. 4.The flexible and foldable thin film lithium metal battery packaging unit of claim 3, wherein: The inner circle folded battery layer (1) and the outer circle surrounding protection battery layer (2) are encapsulated from inside to outside, and comprise an inner layer heat sealing layer (101), an adhesive layer (102), a metal barrier layer (103) and an outer layer protection layer (104), which are stacked in sequence. 5.The flexible and foldable thin film lithium metal battery packaging unit of claim 4, wherein: The inner layer heat sealing layer (101) is arranged as a polypropylene sealing layer, the adhesive layer (102) is arranged as an epoxy resin adhesive layer, the metal barrier layer (103) is arranged as an aluminum foil water and oxygen barrier layer, and the outer layer protection layer (104) is arranged as a polyethylene terephthalate protection layer. 6.The flexible and foldable thin film lithium metal battery packaging unit of claim 5, wherein: The soft connection structure (4) comprises an upper polyester film layer (401) and a lower polyester film layer (402), which cover the upper and lower surfaces of the polyethylene terephthalate protection layer respectively, and the edges of the upper polyester film layer (401) and the lower polyester film layer (402) are bonded by heat pressing. 7.The flexible and foldable thin film lithium metal battery packaging unit of claim 6, wherein: The inner circle folded battery layer (1) comprises an inner circle first battery (1011), an inner circle second battery (1012), an inner circle third battery (1013) and an inner circle fourth battery (1014), and the inner circle first battery (1011) and the inner circle second battery (1012) are connected in series.

Images