HOUSING AND BATTERY HAVING THE SAME

A housing includes a first housing and a second housing. The second housing is provided with at least one protrusion, and the first housing includes a bottom wall and a side wall. The side wall is disposed on a peripheral edge of the bottom wall to form an accommodating space together with the bottom wall. The second housing is disposed on a side of the side wall away from the bottom wall, and the at least one protrusion is accommodated in the accommodating space and comes in contact with an inner surface of the side wall.

TECHNICAL FIELD

This application relates to the battery field, and in particular, to a housing and a battery having the housing.

BACKGROUND

An existing battery generally includes a housing, a cover, a cell, and so on. The cover and the housing are generally positioned by a flange structure, and then are connected together by welding. However, positioning by using the flange structure has the following problems: 1. The flange structure occupies inner space of the battery, which leads to a reduced energy density of the battery. 2. The flange structure features low positioning precision and is prone to weld deviation during welding, which leads to liquid leakage of the battery. 3. Use of the flange structure increases costs of raw materials of the battery.

SUMMARY

In view of this, it is necessary to provide a housing to resolve the foregoing problems.

A housing in an embodiment is disclosed, the housing includes a first housing and a second housing, where at least one protrusion is disposed in the second housing, and the first housing includes a bottom wall and a side wall disposed on a peripheral edge of the bottom wall to form an accommodating space together with the bottom wall; where the second housing is disposed on a side of the side wall away from the bottom wall, and the at least one protrusion is accommodated in the accommodating space and comes in contact with an inner surface of the side wall.

In some embodiments, the at least one protrusion comprises a plurality of protrusions, and the plurality of the protrusions are arranged in succession.

In some embodiments, the at least one protrusion comprises a plurality of protrusions, and the plurality of the protrusions are arranged in an equidistant intermittent manner or a non-equidistant intermittent manner.

In some embodiments, a cross-section of the at least one protrusion is fan-shaped, oval, triangular, square, pentagonal, or circular.

In some embodiments, a height of the at least one protrusion is not greater than 50 millimeters.

In some embodiments, a distance between an end of the at least one protrusion facing towards the first housing and the side wall is 0 to 100 millimeters.

In some embodiments, the at least one protrusion protrudes from a surface of the second housing facing towards the first housing.

In some embodiments, the at least one protrusion is formed on an inner surface of the second housing, and a groove is formed at a location, corresponding to the at least one protrusion, on an outer surface of the second housing.

A battery in an embodiment is disclosed, the battery includes a cell and the foregoing housing, where the cell is accommodated in the housing.

In some embodiments, the battery further includes a pole, and the pole is disposed on the second housing.

In conclusion, the at least one protrusion of the second housing is accommodated in the accommodating space and comes in contact with the inner surface of the side wall to limit the second housing, thereby implementing precise positioning between the first housing and the second housing, and avoiding liquid leakage caused by weld deviation during welding of the first housing and the second housing. In addition, positioning by using the at least one protrusion also avoids a defect that a conventional positioning structure occupies an internal space of the housing, thereby improving the energy density of the battery. In addition, manufacturing costs of the battery are greatly reduced.

REFERENCE NUMERALS OF MAIN COMPONENTS

This application will be further described with reference to the accompanying drawings in the following specific embodiments.

DETAILED DESCRIPTION

Unless otherwise defined, all technical and scientific terms used herein shall have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are merely intended to describe specific embodiments but not intended to constitute any limitation on this application.

Some implementations of this application are described in detail below with reference to the accompanying drawings. In absence of conflicts, the following embodiments and features in the embodiments may be combined.

Referring toFIG. 1, an implementation of this application provides a housing10. The housing10includes a first housing11and a second housing12.

The first housing11includes a bottom wall111and a side wall112. The side wall112is disposed on a peripheral edge of the bottom wall111to form an accommodating space113together with the bottom wall111. A shape of the bottom wall111may be adaptively adjusted based on an actual requirement, and may be a regular shape such as a rectangle, a triangle, or a circle, or another irregular shape.

In this implementation, a material of the first housing11may be metal, plastic, or a composite material of metal and plastic. The metal may be selected from one or more of materials such as steel alloy, aluminum alloy, iron alloy, copper alloy, and other metals.

As shown inFIG. 1andFIG. 2, the second housing12is provided with at least one protrusion13.

The second housing12is disposed on a side of the side wall112away from the bottom wall111, and the at least one protrusion13is accommodated in the accommodating space113and comes in contact with an inner surface of the side wall112. In this way, precise positioning is implemented between the first housing11and the second housing12through limitation of the at least one protrusion13. Specifically, a surface of the at least one protrusion13in the accommodating space113includes an arc face and a plat face. The inner surface of the side wall112is a plane, and the flat face of the at least one protrusion13is in contact with the inner surface of the side wall112. In this implementation, the first housing11and the second housing12are secured by welding.

In this implementation, a shape of the second housing12may be adaptively adjusted based on the shape of the bottom wall111or other actual requirements, and may be a regular shape such as a rectangle, a triangle, or a circle, or other irregular shapes. A material of the second housing12may be metal, plastic, or a composite material of metal and plastic. The metal may be selected from one or more of materials such as steel alloy, aluminum alloy, iron alloy, copper alloy, and other metals.

As shown inFIG. 1andFIG. 2, the second housing12includes an inner surface121and an outer surface122away from the inner surface121. The inner surface121faces towards the first housing11. In this implementation, the at least one protrusion13is formed on the inner surface121, and a groove123is formed at a location, corresponding to the at least one protrusion13, on the outer surface122. In this implementation, a cross-section of the at least one protrusion13is fan-shaped, oval, triangular, square, pentagonal, circular, or polygonal. A height H of the at least one protrusion13is not greater than 50 millimeters. A distance L between an end of the at least one protrusion13facing towards the first housing11and the side wall112is 0 to 100 millimeters. A depth D of the groove123is not greater than 100 mm. The at least one protrusion13may be formed by punching the outer surface122of the second housing12.

Referring toFIG. 3, in another implementation, the at least one protrusion13protrudes from the inner surface121of the second housing12. The at least one protrusion13may be formed on the inner surface121of the second housing12by using a process such as bonding or welding. In another implementation, the at least one protrusion13and the second housing12may alternatively be formed integrally.

Referring toFIG. 4, in an implementation, a plurality of protrusions13are disposed on the second housing12, and the plurality of protrusions13are arranged in an equidistant intermittent manner, or may be arranged in a non-equidistant intermittent manner, as shown inFIG. 5.

Referring toFIG. 6, in another implementation, the at least one protrusion includes a plurality of protrusions13. The plurality of the at least one protrusions13are arranged in succession. Certainly, the second housing12may alternatively include one protrusion13, and the at least one protrusion13is annular or circular.

Referring toFIG. 4, in this implementation, the second housing12includes eight protrusions13. The eight protrusions13are disposed on the inner surface121of the second housing12, and are arranged in an equidistant intermittent manner. In this way, precise positioning is implemented between the first housing11and the second housing12through limitation of the protrusions13. The first direction and the second direction are perpendicular to each other.

Referring toFIG. 5, in an implementation, the eight protrusions13are arranged in a non-equidistant intermittent manner. In another implementation, a quantity of protrusions13is not limited, and may be one, two, three, four, five, six, seven, nine, ten, or the like.

Referring toFIG. 1, in this implementation, an injection hole (not shown in the figure) may further be provided in the housing10, and the injection hole may be located in the first housing11or the second housing12. An electrolyte may be injected through the injection hole. The injection hole is provided with an injection plug14, and the injection plug14is configured to seal the injection hole, so as to prevent leakage of the injected electrolyte or prevent external impurities from entering the housing10.

Referring toFIG. 7, an implementation of this application further provides a battery100. The battery100includes the housing10and a cell20. The cell20is accommodated in the housing10. The battery100may be a button battery, and a material of the housing of the battery100may be steel. In an implementation, the cell20may be a laminated core or a wound core.

The battery100further includes a pole30. The pole30is disposed on the second housing12. In this implementation, the cell20may include a negative electrode plate201, a positive electrode plate202, and a separator203disposed between the negative electrode plate201and the positive electrode plate202. The negative electrode plate201, the positive electrode plate202, and the separator203are laminated to form the cell20. The negative electrode plate201includes a negative current collector and a negative active material layer formed on a surface of the negative current collector. The positive electrode plate202includes a positive current collector and a positive active material layer formed on a surface of the positive current collector. The negative current collector and the positive current collector may be respectively connected to the negative tab204and the positive tab205by welding. The negative tab204may be connected to the first housing11or the second housing12by welding, and the positive tab205may be connected to the pole30by welding, so that the pole30and the second housing12present opposite polarity.

In this implementation, the battery100further includes a first protection element40accommodated in the housing10. The first protection element40is located between the cell20and the housing10. Specifically, there are two first protection elements40. One of the first protection elements40is disposed above the cell20and located between the cell20and the inner surface121of the second housing12, and is configured to isolate the cell20from the second housing12and prevent the pole30from piercing through the plate of the cell20. The other first protection element40is disposed below the cell20and located between the cell20and the bottom wall111of the first housing11, and is configured to isolate the cell20from the bottom wall111of the first housing11.

The battery100further includes a second protection element50accommodated in the housing10. The second protection element50surrounds an outer circumference of the cell20. The second protection element50is configured to isolate the cell20from the second housing12. The second protection element50may be substantially annular, so as to surround the outer circumference of the cell20.

This application is described in detail below by using the embodiments.

Referring toFIG. 1, the housing10includes the first housing11and the second housing12.

The first housing11includes the bottom wall111and the side wall112. The side wall112is disposed on the peripheral edge of the bottom wall111to form the accommodating space113together with the bottom wall111. In this implementation, the bottom wall111is circular.

Also referring toFIG. 2, the second housing12is provided with the at least one protrusion13. The second housing12is disposed on the side of the side wall112away from the bottom wall111, and the at least one protrusion13is disposed in the accommodating space113and comes in contact with the inner surface of the side wall112. In this implementation, the first housing11is circular.

The second housing12includes the inner surface121and the outer surface122away from the inner surface121. The inner surface121faces towards the first housing11. In this implementation, the at least one protrusion13is formed on the inner surface121, and the groove123is formed at the location, corresponding to the at least one protrusion13, on the outer surface122. The at least one protrusion13may be formed by punching the outer surface122of the second housing12. The cross-section of the at least one protrusion13is fan-shaped. A diameter of the fan shape is not greater than 1000 mm.

Referring toFIG. 3, in another implementation, the at least one protrusion13protrudes from the inner surface121of the second housing12. The at least one protrusion13may be formed on the inner surface121of the second housing12by using a process such as bonding or welding. In another implementation, the at least one protrusion13and the second housing12may alternatively be formed integrally.

Referring toFIG. 8, a difference between Embodiment 2 and Embodiment 1 lies in that the cross-section of the at least one protrusion13is triangular. The at least one protrusion13may be formed by punching the outer surface122of the second housing12.

Referring toFIG. 9, in another implementation, the at least one protrusion13protrudes from the inner surface121of the second housing12. The at least one protrusion13may be formed on the inner surface121of the second housing12by using a process such as bonding or welding. In another implementation, the at least one protrusion13and the second housing12may alternatively be formed integrally.

Referring toFIG. 10, a difference between Embodiment 3 and Embodiment 1 lies in that the cross-section of the at least one protrusion13is square. The at least one protrusion13may be formed by punching the outer surface122of the second housing12.

Referring toFIG. 11, in another implementation, the at least one protrusion13protrudes from the inner surface121of the second housing12. The at least one protrusion13may be formed on the inner surface121of the second housing12by using a process such as bonding or welding. In another implementation, the at least one protrusion13and the second housing12may alternatively be formed integrally.

Referring toFIG. 12, a difference between Embodiment 4 and Embodiment 1 lies in that the cross-section of the at least one protrusion13is pentagonal. The at least one protrusion13may be formed by punching the outer surface122of the second housing12.

Referring toFIG. 13, in another implementation, the at least one protrusion13protrudes from the inner surface121of the second housing12. The at least one protrusion13may be formed on the inner surface121of the second housing12by using a process such as bonding or welding. In another implementation, the at least one protrusion13and the second housing12may alternatively be formed integrally.

Referring toFIG. 14, a difference between Embodiment 5 and Embodiment 1 lies in that the cross-section of the at least one protrusion13is substantially semicircular. The at least one protrusion13may be formed by punching the outer surface122of the second housing12.

Referring toFIG. 15, in another implementation, the at least one protrusion13protrudes from the inner surface121of the second housing12. The at least one protrusion13may be formed on the inner surface121of the second housing12by using a process such as bonding or welding. In another implementation, the at least one protrusion13and the second housing12may alternatively be formed integrally.

In conclusion, the at least one protrusion13of the second housing12is accommodated in the accommodating space113and comes in contact with the inner surface of the side wall112to limit the second housing12, thereby implementing precise positioning between the first housing11and the second housing12, and avoiding liquid leakage caused by weld deviation during welding of the first housing11and the second housing12. In addition, positioning by using the at least one protrusion13also avoids a defect that a conventional positioning structure occupies an internal space of the housing10, thereby improving the energy density of the battery100. Furthermore, manufacturing costs of the battery100are greatly reduced.

The foregoing embodiments are merely intended to describe the technical solutions of this application, but not intended to constitute any limitation. Although this application is described in detail with reference to embodiments, persons of ordinary skill in the art should understand that modifications or equivalent replacements can be made to the technical solutions of this application, without departing from the spirit and essence of the technical solutions of this application.