Battery and electric equipment

Abstract

In order to solve the problems that an existing battery cell is easy to shake in a shell and the end part and the side surface of the battery cell are easy to deform in a falling state, the utility model provides a battery which comprises the shell, the battery cell and a protective layer, and the interior of the shell is hollow to form an accommodating cavity; the battery core is arranged in the accommodating cavity, the battery core comprises end surfaces and side surfaces, the protective layer comprises a first expansion layer and a second expansion layer, the first expansion layer is arranged on at least one end surface, and the second expansion layer is arranged on at least one side surface; after the battery disclosed by the utility model is heated or filled with electrolyte, the first expansion layer and the second expansion layer are expanded to completely fill a gap between the battery cell and the shell, and the battery cell is relatively fixed in the battery shell, so that the battery cell is prevented from deviating and swinging, the protective layer is thickened after being expanded, and the battery cell is free from any rigid damage; when the battery falls off, friction or collision between the battery cell and the battery shell can be reduced, so that the conditions of battery deformation and the like are reduced. The utility model also provides electric equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and electrical equipment. Background Art

[0002] When steel shell button batteries are assembled, a certain gap is left in the shell to facilitate the insertion of the battery cell, causing the battery cell to be in a shaking state inside the shell. When the battery falls from a high place and causes a large impact force, the ends and sides of the battery cell are subjected to greater stress, which can easily cause deformation of the ends and sides of the battery. Therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be solved. Utility Model Content

[0003] Aiming at the problem that the battery core is easy to shake inside the shell and the end and side of the battery core are easy to deform when falling, the utility model provides a battery and an electric device.

[0004] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0005] On the one hand, the utility model provides a battery, comprising: a shell, a battery cell and a protective layer, the shell is hollow inside to form a accommodating cavity; the battery cell is arranged in the accommodating cavity, the battery cell comprises an end face and a side face, the protective layer comprises a first expansion layer and a second expansion layer, the first expansion layer is arranged on at least one of the end faces, the second expansion layer is arranged on at least one of the side faces, when the first expansion layer and the second expansion layer are in an unexpanded state, a gap is left between the first expansion layer and the second expansion layer and the accommodating cavity; when the first expansion layer and the second expansion layer are in an expanded state, the first expansion layer and the second expansion layer fill the gap between the battery cell and the accommodating cavity.

[0006] Optionally, the first expansion layer and the second expansion layer both include a base layer and an adhesive layer arranged on a surface of the base layer, the adhesive layer of the first expansion layer adheres to at least one of the end faces, and the adhesive layer of the second expansion layer is arranged on at least one of the side faces.

[0007] Optionally, the battery cell includes a first end face and a second end face arranged opposite to each other, and at least one of the first end face and the second end face serves as a tab lead-out end of the battery cell; when the first expansion layer is arranged on the first end face, the adhesive layer of the first expansion layer is bonded to the first end face, the tab at the first end face is bent, and the tab is arranged on the base surface of the first expansion layer; when the protective layer is arranged on the second end face, the adhesive layer of the first expansion layer is bonded to the second end face, the tab at the second end face is bent, and the tab is arranged on the base surface of the first expansion layer.

[0008] Optionally, the battery core includes a first side surface and a second side surface which are arranged opposite to each other along a shorter side of the battery core, two second expansion layers are provided, and the adhesive layers of the second expansion layers are respectively bonded to the first side surface and the second side surface.

[0009] Optionally, the shell includes a shell body and a cover body, wherein the cover body covers an open opening of the shell body and is sealed with the shell body.

[0010] Optionally, the distance between the first end face of the battery cell and the cover body is a1, and the range of a1 is 0.1-0.4 mm; the distance between the second end face of the battery cell and the bottom of the shell body is a2, and the range of a2 is 0.1-0.4 mm.

[0011] Optionally, the distances between the first side surface and the second side surface of the battery cell and two adjacent inner side surfaces of the shell body are respectively b, and the range of b is 0.05-0.1 mm.

[0012] Optionally, the first expansion layer and the second expansion layer are each independently selected from a swelling tape or an expansion tape.

[0013] Optionally, the expansion ratio of the first expansion layer and the second expansion layer is 200% to 500%.

[0014] Another aspect of the utility model provides an electrical device, comprising the battery described above.

[0015] According to the battery provided by the utility model, by arranging the protective layer at the end and the side of the battery cell, when the battery is heated or filled with electrolyte, the first expansion layer at the end of the battery cell and the second expansion layer at the side of the battery cell will expand in volume, and the first expansion layer at the upper and lower ends of the battery cell and the second expansion layer at the side of the battery cell will tightly clamp the battery cell in the battery shell after expansion, and at the same time, the expanded first expansion layer and the second expansion layer will completely fill the gaps between the upper and lower ends of the battery cell and the shell and the gaps between the side of the battery cell and the battery shell, and relatively fix the battery cell in the battery shell to prevent the battery cell from swinging out of position, and the protective layer will become softer and thicker after expansion, and will not cause any hard damage to the battery cell. At the same time, due to the inherent insulation properties of the protective layer, it can ensure that when the battery falls, the friction or collision between the battery cell and the battery shell is reduced, thereby causing battery deformation and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a battery provided by an embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of a battery cell provided by an embodiment of the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of a protective layer provided by an embodiment of the utility model;

[0019] The reference numerals in the drawings of the specification are as follows:

[0020] 1-shell; 11-shell body; 12-cover body; 13-accommodating cavity; 2-battery cell; 21-first end face; 22-second end face; 23-ear; 231-positive ear; 232-negative ear; 24-first side; 25-second side; 3-protective layer; 31-first expansion layer; 32-second expansion layer; 33-base layer; 34-adhesive layer. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] In the description of the present invention, it should be understood that the terms "side", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figure 1-2 As shown, in one embodiment, the utility model provides a battery on the one hand, including: a shell 1, a battery cell 2 and a protective layer 3, the shell 1 is hollow inside to form a accommodating cavity 13; the battery cell 2 is arranged in the accommodating cavity 13, the battery cell 2 includes an end face and a side face, the protective layer 3 includes a first expansion layer 31 and a second expansion layer 32, the first expansion layer 31 is arranged on at least one end face, and the second expansion layer 32 is arranged on at least one side face, when the first expansion layer 31 and the second expansion layer 32 are in an unexpanded state, a gap is left between the first expansion layer 31 and the second expansion layer 32 and the accommodating cavity 13; when the first expansion layer 31 and the second expansion layer 32 are in an expanded state, the first expansion layer 31 and the second expansion layer 32 fill the gap between the battery cell 2 and the accommodating cavity 13.

[0025] After the battery of the utility model is heated or filled with electrolyte, the first expansion layer 31 at the upper and lower ends of the battery cell 2 and the second expansion layer 32 at the side of the battery cell 2 will expand in volume. After the first expansion layer 31 at the upper and lower ends of the battery cell 2 and the second expansion layer 32 at the side of the battery cell 2 expand, the battery cell 2 will be tightly clamped in the battery shell 1. At the same time, the expanded first expansion layer 31 and the second expansion layer 32 will fill the gaps between the upper and lower ends of the battery cell 2 and the shell 1 and the gaps between the side of the battery cell 2 and the battery shell 1, and relatively fix the battery cell 2 in the battery shell 1 to prevent the battery cell 2 from swinging out of position. After the expansion, the protective layer 3 becomes softer and thicker, and there will be no hard damage to the battery cell 2. At the same time, due to the inherent insulation properties of the protective layer 3, it can ensure that when the battery falls, the friction or collision between the battery cell 2 and the battery shell 1 is reduced, thereby causing battery deformation and the like.

[0026] like Figure 1-3 As shown, in one embodiment, the first expansion layer 31 and the second expansion layer 32 both include a base layer 33 and an adhesive layer 34 arranged on a surface of the base layer 33, the adhesive layer 34 of the first expansion layer 31 is adhered to at least one end face, and the adhesive layer 34 of the second expansion layer 32 is arranged on at least one side face.

[0027] Specifically, the first expansion layer 31 is relatively fixedly connected to the upper and lower ends of the battery cell 2 through the adhesive layer 34, so that the first expansion layer 31 is not easily displaced; the second expansion layer 32 is relatively fixedly connected to the side of the battery cell 2 through the adhesive layer 34, so that the second expansion layer 32 is not easily displaced; after the battery is heated or filled with electrolyte, the first expansion layer 31 and the second expansion layer 32 will expand in volume, thereby tightly clamping the battery cell 2 in the battery case 1 to prevent the battery cell 2 from swinging out of position; the protective layer 3 becomes softer and thicker after expansion, which can ensure that the friction or collision between the battery cell 2 and the battery case 1 is reduced when the battery falls.

[0028] like Figure 1-2 As shown, in one embodiment, the battery cell 2 includes a first end face 21 and a second end face 22 that are arranged opposite to each other, and at least one of the first end face 21 and the second end face 22 serves as a lead-out end of the pole ear 23 of the battery cell 2. When the first expansion layer 31 is arranged on the first end face 21, the adhesive layer 34 of the first expansion layer 31 is bonded to the first end face 21, the pole ear 23 at the first end face 21 is bent, and the pole ear 23 is arranged on the surface of the base layer 33 of the first expansion layer 31; when the protective layer 3 is arranged on the second end face 22, the adhesive layer 34 of the first expansion layer 31 is bonded to the second end face 22, the pole ear 23 at the second end face 22 is bent, and the pole ear 23 is arranged on the surface of the base layer 33 of the first expansion layer 31.

[0029] Specifically, the first end face 21 of the battery cell 2 leads to one of the positive electrode ear 231 or the negative electrode ear 232, and the second end face 22 of the battery cell 2 leads to the other of the positive electrode ear 231 or the negative electrode ear 232. After the battery is heated or the electrolyte is poured into the battery, the first expansion layer 31 expands due to the absorption of heat or electrolyte. The first expansion layer 31 becomes softer and thicker after expansion. After the first expansion layer 31 expands, the battery cell 2 is pressed downward tightly into the inside of the battery case 1, and the gap between the upper end of the battery cell 2 and the lower end of the battery case 1 is completely filled. The positive electrode ear 231 or the negative electrode ear 232 of the first end face 21 of the battery cell 2 is The negative pole ear 232 is in contact with the surface of the base layer 33 of the first expansion layer 31 provided on the first end face 21 of the battery cell 2, and the positive pole ear 231 or the negative pole ear 232 of the second end face 22 of the battery cell 2 is in contact with the surface of the base layer 33 of the first expansion layer 31 provided on the second end face 22 of the battery cell 2, so that the battery cell 2 and the positive pole ear 231 and the negative pole ear 232 are relatively fixed inside the battery shell 1 to prevent them from shifting, thereby ensuring that the battery cell 2 is protected after falling, reducing the friction between the battery cell 2 and the battery shell 1, and avoiding the pole ear 23 from being torn and broken, thereby ensuring that the battery is not deformed or the pole ear 23 is not torn and broken after falling.

[0030] In another embodiment, the positive pole ear 231 and the negative pole ear 232 are led out from the first end face 21 or the second end face 22 of the battery cell 2, and the positive pole ear 231 or the negative pole ear 232 of the first end face 21 or the second end face 22 of the battery cell 2 is abutted against the surface of the base layer 33 of the first expansion layer 31 provided on the first end face 21 or the second end face 22 of the battery cell 2, so that the battery cell 2 and the positive pole ear 231 and the negative pole ear 232 are relatively fixed inside the battery shell 1 and are not allowed to shift, thereby ensuring that the battery cell 2 is protected after the battery falls, reducing the friction between the battery cell 2 and the battery shell 1, and avoiding the pole ear 23 from breaking or changing the bending angle, thereby ensuring that the battery is not deformed after the battery falls.

[0031] like Figure 1-2 As shown, in one embodiment, the battery cell 2 includes a first side surface 24 and a second side surface 25 which are arranged opposite to each other along the shorter side of the battery cell 2, two second expansion layers 32 are provided, and the adhesive layer 34 of the second expansion layer 32 is respectively bonded to the first side surface 24 and the second side surface 25; after the battery is heated or the electrolyte is poured into the battery, the second expansion layer 32 expands due to the absorption of heat or electrolyte, and the second expansion layer 32 becomes softer and thicker after expansion. After the second expansion layer 32 expands, the gap between the battery cell 2 and the shell 1 is filled, so that the battery cell 2 is relatively fixed in the battery shell 1, so that the battery cell 2 is relatively fixed inside the battery shell 1 and does not deviate, thereby ensuring that the battery cell 2 is protected after the battery falls, reducing the friction between the battery cell 2 and the battery shell 1, and ensuring that the battery is not deformed after the battery falls.

[0032] like Figure 1 As shown, in one embodiment, the housing 1 includes a housing body 11 and a cover body 12 . The cover body 12 covers the opening of the housing body 11 and is sealed with the housing body 11 .

[0033] The shell 1 includes a shell body 11 and a cover body 12. The shell body 11 is a cylindrical structure with a accommodating cavity 13 in the middle. The shell body 11 has an opening, and the battery cell 2 is placed in the accommodating cavity 13 in the shell body 11 through the opening. Then the cover body 12 covers the opening of the shell body 11 to seal the battery cell 2 in the accommodating cavity 13 of the shell body 11. The seal can prevent gaseous, liquid or solid substances from circulating between the inside and outside of the shell body 11, thereby affecting the performance of the battery.

[0034] like Figure 1 As shown, in one embodiment, the distance between the first end surface 21 of the battery cell 2 and the cover body 12 is a1, and the range of a1 is 0.1-0.4mm; the distance between the second end surface 22 of the battery cell 2 and the bottom of the shell body 11 is a2, and the range of a2 is 0.1-0.4mm.

[0035] In a preferred embodiment, the distance between the first end surface 21 of the battery cell 2 and the cover body 12 is a1, and the range of a1 is 0.2-0.3mm; specifically, the range of a1 is any point value among 0.1mm, 0.2mm, 0.3mm or 0.4mm, or a range value composed of any two point values.

[0036] In a preferred embodiment, the distance between the second end surface 22 of the battery cell 2 and the bottom of the shell body 11 is a2, and the range of a2 is 0.2-0.3mm; specifically, the range of a2 is any point value among 0.1mm, 0.2mm, 0.3mm or 0.4mm, or a range value composed of any two point values.

[0037] When the value range of a1 or a2 is less than 0.1 mm, the first expansion layer 31 will become thicker after expansion, thereby squeezing the pole ear 23, increasing the force on the pole ear 23, causing the pole ear 23 to deform, and increasing the friction between the pole ear 23 and the battery cover 12 or the shell body 11, so that the battery is prone to deformation after falling.

[0038] When the value range of a1 or a2 is greater than 0.4 mm, the first expansion layer 31 will become thicker after expansion, and its thickness is smaller than the distance between the first end face 21 of the battery cell 2 and the cover body 12 or the distance between the second end face 22 of the battery cell 2 and the bottom of the shell body 11, so that the gap between the upper end of the battery cell 2 and the lower end of the battery shell 1 cannot be completely filled, and the battery cell 2 will still be offset inside the battery shell 1, which may easily cause battery deformation after the battery falls.

[0039] like Figure 1 As shown, in one embodiment, the distance between the first side surface 24 and the second side surface 25 of the battery cell 2 and the two inner side surfaces of the shell body 11 is respectively b, and the range of b is 0.05-0.1 mm.

[0040] In a preferred embodiment, the distance between the first side surface 24 and the second side surface 25 of the battery cell 2 and the two inner side surfaces of the shell body 11 is 0.07-0.09 mm; specifically, the distance between the first side surface 24 and the second side surface 25 of the battery cell 2 and the two inner side surfaces of the shell body 11 is any point value among 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm or 0.1 mm or a range value consisting of any two point values.

[0041] When the value range of b is less than 0.1 mm, the second expansion layer 32 will become thicker after expansion, increasing the friction between the battery core 2 and the shell body 11, so that the battery is prone to deformation after falling.

[0042] When the value range of b is greater than 0.4 mm, the second expansion layer 32 will become thicker after expansion, and its thickness is less than the distance between the first side surface 24 or the second side surface 25 of the battery cell 2 and the side surface of the shell body 11, so that the gap between the battery cell 2 and the side surface of the battery shell 1 cannot be completely filled, and the battery cell 2 will still be offset inside the battery shell 1, so that the battery is prone to deformation after falling.

[0043] In one embodiment, the first expansion layer 31 and the second expansion layer 32 are each independently selected from a swelling tape or an expansion tape.

[0044] The swelling tape or the expansion tape will expand at a multiple of the speed after being heated or soaked in electrolyte, which can effectively prevent the battery cell 2 from shifting.

[0045] In one embodiment, the expansion ratio of the first expansion layer 31 and the second expansion layer 32 is 200% to 500%.

[0046] Since there is a gap between the battery cell 2 and the battery body, it is convenient for the battery cell 2 to enter the accommodating cavity 13 without causing damage to the battery cell 2, the tab 23, the first expansion layer 31 and the second expansion layer 32. After heating or pouring electrolyte, the first expansion layer 31 and the second expansion layer 32 will expand in volume, filling the gaps between the upper and lower ends of the battery cell 2 and the shell 1 and the gaps between the sides of the battery cell 2 and the battery shell 1, and relatively fixing the battery cell 2 in the battery shell 1 to prevent the battery cell 2 from swinging out of position.

[0047] Another aspect of the utility model provides an electrical device, comprising the above-mentioned battery.

[0048] The battery mentioned in this embodiment can be in the shape of a cuboid, a cylinder, a flat body or any other shape, which is not limited in the embodiments of this application. Similarly, the battery can also be divided into high lithium ion batteries, sodium ion batteries, nickel-hydrogen batteries, etc., which are not limited in the embodiments of this application.

[0049] The battery cell 2 includes a positive electrode sheet, a negative electrode sheet and a separator. The positive electrode sheet, the separator and the negative electrode sheet are stacked in order to form a small battery cell 2, and then the small battery cell 2 is stacked in parallel. At this time, a battery with a laminated structure can be obtained. The stacked positive and negative electrode sheets and the separator can also be wound to obtain a wound structure battery. In addition, the battery cell 2 can be a laminated structure or a wound structure, which is not limited in the embodiments of the present application.

[0050] When the battery cell 2 is a cylindrical structure, a first expansion layer 31 is disposed on the first end surface 21 and the second end surface 22 of the battery cell 2 , and a second expansion layer 32 is disposed on the side surface of the battery cell 2 . The second expansion layer 32 is at least attached to a portion of the outer surface of the battery cell 2 .

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that: include: A shell, a battery cell and a protective layer, wherein the interior of the shell is hollow to form a accommodating cavity; the battery cell is arranged in the accommodating cavity, the battery cell includes an end face and a side face, the protective layer includes a first expansion layer and a second expansion layer, the first expansion layer is arranged on at least one of the end faces, and the second expansion layer is arranged on at least one of the side faces, when the first expansion layer and the second expansion layer are in an unexpanded state, a gap is left between the first expansion layer and the second expansion layer and the accommodating cavity; when the first expansion layer and the second expansion layer are in an expanded state, the first expansion layer and the second expansion layer fill the gap between the battery cell and the accommodating cavity.

2. The battery according to claim 1, characterized in that: The first expansion layer and the second expansion layer both include a base layer and an adhesive layer disposed on a surface of the base layer. The adhesive layer of the first expansion layer adheres to at least one of the end faces, and the adhesive layer of the second expansion layer is disposed on at least one of the side faces.

3. The battery according to claim 2, characterized in that: The battery cell includes a first end face and a second end face that are arranged opposite to each other, and at least one of the first end face and the second end face serves as a tab lead-out end of the battery cell. When the first expansion layer is arranged on the first end face, the adhesive layer of the first expansion layer is bonded to the first end face, the tab at the first end face is bent, and the tab is arranged on the base surface of the first expansion layer; when the protective layer is arranged on the second end face, the adhesive layer of the first expansion layer is bonded to the second end face, the tab at the second end face is bent, and the tab is arranged on the base surface of the first expansion layer.

4. The battery according to claim 2, characterized in that: The battery core includes a first side surface and a second side surface which are arranged opposite to each other along a shorter side of the battery core. Two second expansion layers are provided. The adhesive layers of the second expansion layers are respectively bonded to the first side surface and the second side surface.

5. The battery according to claim 3, characterized in that: The shell includes a shell body and a cover body, wherein the cover body covers an open opening of the shell body and is sealed with the shell body.

6. The battery according to claim 5, characterized in that: The distance between the first end face of the battery cell and the cover body is a1, and the range of a1 is 0.1-0.4 mm; the distance between the second end face of the battery cell and the bottom of the shell body is a2, and the range of a2 is 0.1-0.4 mm.

7. The battery according to claim 5, characterized in that: The distances between the first side surface and the second side surface of the battery cell and the two adjacent inner side surfaces of the shell body are respectively b, and the range of b is 0.05-0.1 mm.

8. The battery according to claim 1, characterized in that: The first expansion layer and the second expansion layer are each independently selected from one of a swelling tape or an expansion tape.

9. The battery according to claim 1, characterized in that: The expansion ratio of the first expansion layer and the second expansion layer is 200% to 500%.

10. An electrical equipment, characterized in that: A battery comprising any one of claims 1 to 9.

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