Battery

Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a battery. A battery comprises a shell, a pole and a pole core, the shell comprises a top cover and a bottom shell, the top cover covers the bottom shell, a containing cavity is formed in the top cover and the bottom shell, and the pole core is arranged in the containing cavity; a hollow channel extending in the axial direction of the pole core is formed in the center axis of the pole core, a first tubular protrusion matched with the hollow channel is arranged on the side wall, opposite to the top cover, of the bottom shell, the two ends of the first tubular protrusion are open, the first tubular protrusion is communicated with the containing cavity, and the first tubular protrusion can extend into the hollow channel in the direction close to the top cover; the pole column is inserted into the first tubular bulge, the positive lug of the pole core is electrically connected with the pole column, and the negative lug of the pole core is electrically connected with the shell. According to the utility model, the positive electrode or the negative electrode of the pole core is sealed and insulated through the hollow channel of the pole core, so that the effective space occupied by the insulation and sealing structure can be reduced, and the volume energy density of the battery can be further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion batteries, in particular to a battery. Background Art

[0002] Metal shell batteries are widely used in electronic products. In order to meet consumers' demand for high-endurance electronic products, major manufacturers have begun to manufacture steel shell button batteries and gradually optimize the energy density of steel shell button batteries.

[0003] At present, the steel-shell button batteries on the market generally insulate and seal the positive and negative electrodes by setting a multi-layer structure around the pole core, but this insulation and sealing method occupies the axial or radial space of the pole core. When the internal space of the shell is fixed, the internal space utilization rate of the pole core to the shell is reduced, resulting in the problem of low energy density of the steel-shell button batteries. Utility Model Content

[0004] The technical problem to be solved by the utility model is: to provide a battery for the problem of low energy density of steel shell button batteries in the prior art.

[0005] In order to solve the above technical problems, on the one hand, the embodiment of the utility model provides a battery, including a shell, a pole and a pole core, the shell includes a top cover and a bottom shell, the top cover is covered on the bottom shell and a receiving cavity is provided inside the top cover and the pole core is provided in the receiving cavity;

[0006] The central axis of the pole core is provided with a hollow channel extending along its axial direction, and the side wall of the bottom shell opposite to the top cover is provided with a first tubular protrusion matching the hollow channel, both ends of the first tubular protrusion are open, the first tubular protrusion is communicated with the accommodating cavity, and the first tubular protrusion can extend into the hollow channel in a direction close to the top cover;

[0007] The pole is inserted into the first tubular protrusion, the positive pole ear of the pole core is electrically connected to the pole, and the negative pole ear of the pole core is electrically connected to the shell.

[0008] Optionally, the first tubular protrusion is disposed in the middle of the side wall of the bottom shell opposite to the top cover, and the axis of the hollow channel coincides with the axis of the first tubular protrusion. In this embodiment, this makes it easy to install the winding core.

[0009] Optionally, the length of the hollow channel is greater than the length of the first tubular protrusion, and one end of the pole near the top cover extends into the hollow channel. In this embodiment, the end of the pole extending out of the first tubular protrusion may be lower than, flush with, or beyond the pole core. In addition, the existing steel shell buckle battery, the packing method is to use a pin as a transfer pole ear to connect with the terminal, which increases the packing cost and is not conducive to achieving detachability. In this embodiment, the pole electrically connected to the positive pole ear is used as the positive contact, which reduces one pin welding, reduces manufacturing costs, and at the same time provides the possibility of plug-in detachable buckle battery.

[0010] Optionally, the battery further includes an insulating member, which is connected between the pole and the first tubular protrusion. In this embodiment, the first tubular protrusion is used for sealing in a small range, which can greatly reduce the sealing area. The pole is preferably an aluminum rod, and the insulating member is preferably an insulating glue. The aluminum rod and the insulating glue can be wrapped in advance, or they can be a combination of two loose parts. Generally, the diameter of the aluminum rod is 1.0~3.0mm, and it can be cylindrical or truncated cone or other polyhedron. The insulation sealing method of the aluminum rod and the first tubular protrusion can be through external force extrusion, or it can be through tight assembly or bonding by glue and heating. In addition, some other common knowledge structures in the field such as insulation are not described in this embodiment.

[0011] Optionally, the negative pole ear of the pole core is electrically connected to the top cover, and the positive pole ear of the pole core and the negative pole ear of the pole core are on the same side of the pole core. In this embodiment, the positive and negative pole ears are led out from the same end, which can save space. At the same time, the positive and negative pole ears of the pole core can be led out from any part of the bare pole core, and the pole column and the pole ear are insulated from the negative pole top cover or bottom shell through an insulating sheet.

[0012] Optionally, the first tubular protrusion is integrally formed with the bottom shell, and the first tubular protrusion is connected to the bottom shell in an arc transition. In this embodiment, the shell can be formed in steps using a mold, or can be divided into three sections, an outer circular tube, a flat sheet with a circular hole at the bottom, and a central small circular tube, or two sections can be spliced ​​together to form the shell.

[0013] Optionally, the pole is a solid aluminum rod. In this embodiment, the pole can withstand external forces in the axial and radial directions, and the sealing reliability is further ensured. At the same time, the positive pole ear of the pole core is welded to the aluminum rod, and the negative pole ear of the pole core is welded to the top cover or the bottom shell.

[0014] The pole core is preferably a winding core, and a hollow channel is left in the middle of the winding core during production. According to the battery of this embodiment, the positive or negative electrode of the pole core can be sealed and insulated through the hollow channel of the pole core, and then the positive and negative electrodes can be insulated and sealed by setting a single-layer structure around the pole core. The effective space occupied by the insulation and sealing structure can be reduced to a certain extent, and the internal space of the shell can be maximized, thereby improving the volume energy density of the battery.

[0015] On the other hand, an embodiment of the utility model provides a battery, including a shell, a pole and a pole core, the shell including a top cover and a bottom shell, the top cover is covered on the bottom shell and a receiving cavity is provided inside the top cover and the pole core is provided in the receiving cavity;

[0016] The central axis of the pole core is provided with a hollow channel extending along its axial direction, the top cover is provided with a second tubular protrusion matching the hollow channel, both ends of the second tubular protrusion are open, the second tubular protrusion is communicated with the accommodating cavity, and the second tubular protrusion extends into the hollow channel in a direction close to the side wall of the bottom shell opposite to the top cover;

[0017] The pole is inserted into the second tubular protrusion, the positive pole ear of the pole core is electrically connected to the pole, and the negative pole ear of the pole core is electrically connected to the shell.

[0018] On the other hand, an embodiment of the utility model provides a battery, including a shell, a pole and a pole core, the shell including a top cover and a bottom shell, the top cover is covered on the bottom shell and a receiving cavity is provided inside the top cover and the pole core is provided in the receiving cavity;

[0019] The central axis of the pole core is provided with a hollow channel extending along its axial direction, and the side wall of the bottom shell opposite to the top cover is provided with a third tubular protrusion matching the hollow channel, both ends of the third tubular protrusion are open, the third tubular protrusion is communicated with the accommodating cavity, and the third tubular protrusion extends in a direction away from the top cover;

[0020] The pole is inserted into the third tubular protrusion, the positive pole ear of the pole core is electrically connected to the pole, and the negative pole ear of the pole core is electrically connected to the shell.

[0021] Optionally, the battery further comprises a part to be welded and an insulating part, the insulating part and the part to be welded are sequentially surrounded on the outer circumference of the pole, and the part to be welded is connected between the third tubular protrusion and the pole and welded to the third tubular protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a battery provided by an embodiment of the utility model;

[0023] Figure 2 is a schematic structural diagram of a battery provided by another embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of a battery provided in another embodiment of the utility model.

[0025] The reference numerals in the specification are as follows:

[0026] 1. Shell; 2. Pole; 3. Pole core; 4. Accommodation cavity; 5. First tubular protrusion; 6. Insulator; 7. Second tubular protrusion; 8. Third tubular protrusion; 9. Part to be welded; 11. Top cover; 12. Bottom shell; 31. Hollow channel; 32. Positive ear; 33. Negative ear. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figure 1 As shown, an embodiment of the utility model provides a battery, including a housing 1, a pole 2 and a pole core 3, the housing 1 includes a top cover 11 and a bottom housing 12, the top cover 11 covers the bottom housing 12 and a receiving cavity 4 is provided inside the top cover 11 and the pole core 3 is provided in the receiving cavity 4;

[0029] The central axis of the pole core 3 is provided with a hollow channel 31 extending along its axial direction, and the side wall of the bottom shell 12 opposite to the top cover 11 is provided with a first tubular protrusion 5 matching the hollow channel 31, and both ends of the first tubular protrusion 5 are open, the first tubular protrusion 5 is connected with the accommodating cavity 4, and the first tubular protrusion 5 can extend into the hollow channel 31 in the direction close to the top cover 11;

[0030] The pole 2 is inserted into the first tubular protrusion 5, the positive pole ear 32 of the pole core 3 is electrically connected to the pole 2, and the negative pole ear 33 of the pole core 3 is electrically connected to the shell 1. In this embodiment, the pole core 3 is a winding core, the hollow channel 31 is tubular, and the axial direction of the pole core is attached Figure 1 The top-down direction in .

[0031] In one embodiment, the first tubular protrusion 5 is disposed in the middle of the side wall of the bottom shell 12 opposite to the top cover 11, and the axis of the hollow channel 31 coincides with the axis of the first tubular protrusion 5. In this embodiment, this makes it easy to install the winding core.

[0032] Optionally, the length of the hollow channel 31 is greater than the length of the first tubular protrusion 5, and the end of the pole 2 close to the top cover 11 extends into the hollow channel 31. In this embodiment, the end of the pole 2 extending out of the first tubular protrusion 5 can be lower than, flush with, or beyond the pole core 3. In addition, the existing steel shell buckle is packed in a way that a pin is used as a transfer pole ear to connect with the terminal, which increases the packing cost and is not conducive to achieving detachability. In this embodiment, the pole 2 electrically connected to the positive pole ear 32 is used as the positive contact, which reduces one pin welding, reduces the manufacturing cost, and provides the possibility of plug-in detachable buckle.

[0033] In one embodiment, the battery further includes an insulating member 6, which is connected between the pole 2 and the first tubular protrusion 5. In this embodiment, the first tubular protrusion 5 is used for sealing in a small range, which can greatly reduce the sealing area. The pole 2 is preferably an aluminum rod, and the insulating member 6 is preferably an insulating glue. The aluminum rod and the insulating glue can be wrapped in advance, or they can be a combination of two loose parts. Generally, the diameter of the aluminum rod is 1.0~3.0mm, and it can be cylindrical or truncated cone or other polyhedron. The insulation sealing method of the aluminum rod and the first tubular protrusion 5 can be through external force extrusion, or can be through tight assembly or bonding by glue and heating.

[0034] In one embodiment, the negative pole ear 33 of the pole core 3 is electrically connected to the top cover 11, and the positive pole ear 32 of the pole core 3 and the negative pole ear 33 of the pole core 3 are on the same side of the pole core 3. In this embodiment, the positive and negative pole ears 33 are led out from the same end, which can save space. At the same time, the positive and negative pole ears 33 of the pole core 3 can be led out from any part of the bare pole core 3, and the pole column 2 and the pole ear are insulated from the negative pole top cover 11 or the bottom shell 12 through an insulating sheet.

[0035] In one embodiment, the first tubular protrusion 5 is integrally formed with the bottom shell 12, and the first tubular protrusion 5 is connected to the bottom shell 12 in an arc shape. In this embodiment, the shell 1 can be formed in steps by a mold, or can be divided into three sections, namely, an outer circular tube, a flat sheet with a circular hole at the bottom, and a small central circular tube, by welding, or two sections can be spliced ​​together.

[0036] In one embodiment, the pole 2 is a solid aluminum rod. In this embodiment, the pole 2 can withstand external forces from the axial and radial directions, and the sealing reliability is further ensured. At the same time, the positive pole ear 32 of the pole core 3 is welded to the aluminum rod, and the negative pole ear 33 of the pole core 3 is connected to the top cover 11 or the bottom shell 12 by welding.

[0037] The pole core 3 is preferably a winding core, and a hollow channel 31 is left in the middle of the winding core during production. According to the battery of this embodiment, the positive or negative electrode of the pole core 3 can be sealed and insulated through the hollow channel 31 of the pole core 3, and then the positive and negative electrodes can be insulated and sealed by arranging a single-layer structure around the pole core 3. The effective space occupied by the insulation and sealing structure can be reduced to a certain extent, and the internal space of the shell 1 can be maximized, thereby improving the volume energy density of the battery.

[0038] In addition, if Figure 2 As shown, an embodiment of the utility model provides a battery, including a housing 1, a pole 2 and a pole core 3, the housing 1 includes a top cover 11 and a bottom housing 12, the top cover 11 covers the bottom housing 12 and a receiving cavity 4 is provided inside the top cover 11 and the pole core 3 is provided in the receiving cavity 4;

[0039] The central axis of the pole core 3 has a hollow channel 31 extending along its axial direction, and the top cover 11 is provided with a second tubular protrusion 7 matching the hollow channel 31, and both ends of the second tubular protrusion 7 are open, the second tubular protrusion 7 is connected with the accommodating cavity 4, and the second tubular protrusion 7 extends into the hollow channel 31 toward the side wall of the bottom shell 12 opposite to the top cover 11;

[0040] The pole 2 is inserted into the second tubular protrusion 7 , the positive pole ear 32 of the pole core 3 is electrically connected to the pole 2 , and the negative pole ear 33 of the pole core 3 is electrically connected to the housing 1 .

[0041] In addition, if Figure 3 As shown, an embodiment of the utility model provides a battery, including a housing 1, a pole 2 and a pole core 3, the housing 1 includes a top cover 11 and a bottom housing 12, the top cover 11 covers the bottom housing 12 and a receiving cavity 4 is provided inside the top cover 11 and the pole core 3 is provided in the receiving cavity 4;

[0042] The central axis of the pole core 3 is provided with a hollow channel 31 extending along its axial direction, and the side wall of the bottom shell 12 opposite to the top cover 11 is provided with a third tubular protrusion 8 matching the hollow channel 31, and both ends of the third tubular protrusion 8 are open, the third tubular protrusion 8 is connected with the accommodating cavity 4, and the third tubular protrusion 8 extends in a direction away from the top cover 11;

[0043] The pole 2 is inserted into the third tubular protrusion 8 , the positive pole ear 32 of the pole core 3 is electrically connected to the pole 2 , and the negative pole ear 33 of the pole core 3 is electrically connected to the housing 1 .

[0044] In one embodiment, the battery further includes a welded part 9 and an insulating part 6, the insulating part 6 and the welded part 9 are sequentially surrounded on the outer circumference of the pole 2, the welded part 9 is connected between the third tubular protrusion 8 and the pole 2 and welded to the third tubular protrusion 8. In this embodiment, the welded part 9 is preferably made of stainless steel.

[0045] 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: It comprises a shell, a pole and a pole core, the shell comprises a top cover and a bottom shell, the top cover is covered on the bottom shell and forms a receiving cavity inside the top cover and the pole core is arranged in the receiving cavity; The central axis of the pole core is provided with a hollow channel extending along its axial direction, and the side wall of the bottom shell opposite to the top cover is provided with a first tubular protrusion matching the hollow channel, both ends of the first tubular protrusion are open, the first tubular protrusion is communicated with the accommodating cavity, and the first tubular protrusion extends into the hollow channel in a direction close to the top cover; The pole is inserted into the first tubular protrusion, the positive pole ear of the pole core is electrically connected to the pole, and the negative pole ear of the pole core is electrically connected to the shell.

2. The battery according to claim 1, characterized in that The first tubular protrusion is arranged at the middle part of the side wall of the bottom shell opposite to the top cover, and the axis of the hollow channel coincides with the axis of the first tubular protrusion.

3. The battery according to claim 2, characterized in that The length of the hollow channel is greater than the length of the first tubular protrusion, and one end of the pole close to the top cover extends into the hollow channel.

4. The battery according to claim 1, characterized in that An insulating member is also included, and the insulating member is connected between the pole and the first tubular protrusion.

5. The battery according to claim 1, characterized in that The negative pole ear of the pole core is electrically connected to the top cover, and the positive pole ear of the pole core and the negative pole ear of the pole core are on the same side of the pole core.

6. The battery according to claim 1, characterized in that The first tubular protrusion is integrally formed with the bottom shell, and the first tubular protrusion is connected to the bottom shell in an arc-shaped transition.

7. The battery according to claim 1, characterized in that The pole is a solid aluminum rod.

8. A battery, characterized in that: It comprises a shell, a pole and a pole core, the shell comprises a top cover and a bottom shell, the top cover is covered on the bottom shell and a receiving cavity is provided inside the top cover and the pole core is arranged in the receiving cavity; The central axis of the pole core is provided with a hollow channel extending along its axial direction, the top cover is provided with a second tubular protrusion matching the hollow channel, both ends of the second tubular protrusion are open, the second tubular protrusion is communicated with the accommodating cavity, and the second tubular protrusion extends into the hollow channel in a direction close to the side wall of the bottom shell opposite to the top cover; The pole is inserted into the second tubular protrusion, the positive pole ear of the pole core is electrically connected to the pole, and the negative pole ear of the pole core is electrically connected to the shell.

9. A battery, characterized in that: It comprises a shell, a pole and a pole core, the shell comprises a top cover and a bottom shell, the top cover is covered on the bottom shell and a receiving cavity is provided inside the top cover and the pole core is arranged in the receiving cavity; The central axis of the pole core is provided with a hollow channel extending along its axial direction, and the side wall of the bottom shell opposite to the top cover is provided with a third tubular protrusion matching the hollow channel, both ends of the third tubular protrusion are open, the third tubular protrusion is communicated with the accommodating cavity, and the third tubular protrusion extends in a direction away from the top cover; The pole is inserted into the third tubular protrusion, the positive pole ear of the pole core is electrically connected to the pole, and the negative pole ear of the pole core is electrically connected to the shell.

10. The battery according to claim 9, characterized in that It also includes a part to be welded and an insulating part, wherein the insulating part and the part to be welded are sequentially surrounded on the outer circumference of the pole, and the part to be welded is connected between the third tubular protrusion and the pole and welded to the third tubular protrusion.

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