CN218849719U - Battery and electronic device - Google Patents

Abstract

The utility model relates to a battery and electronic equipment. This battery includes roll core, casing and utmost point ear the inside of casing is provided with and holds the chamber, it is located to roll up the core hold the intracavity, the casing is including two end covers that set up relatively, roll up the core including respectively with two the relative two terminal surfaces that set up of end cover, it is the spiral winding structure to roll up the core, the middle part vacuole formation of spiral winding structure, roll up the core including being close to the top of cavity, utmost point ear with roll up being close to of core the position welding of top, utmost point ear still include by roll up the outside connecting portion of drawing forth of core, connecting portion are circularly, the laminating of connecting portion is in on the terminal surface, connecting portion cover the cavity, connecting portion are connected with the end cover.

Description

Battery and electronic device

Technical Field

The utility model relates to an energy memory technical field, more specifically, the utility model relates to a battery and electronic equipment.

Background

A battery typically includes a can and a jellyroll disposed within the can. The winding core is in a spiral winding structure or a lamination structure. The winding core is provided with a tab, and the tab is usually strip-shaped. The pole ear is led out from the edge of the winding core and then is attached to the end surface of the winding core and is connected with the end cover of the shell.

The portion of the tab located in the end cap is generally rectangular. When charging and discharging, current flows through the tabs, and a magnetic field is generated. The magnetic field generated by the rectangular tab is not uniform, so that the magnetic field of other electrical elements adjacent to the battery, such as the horn, is changed, so that the magnetic field of the horn becomes a non-uniform magnetic field, and thus, noise is reduced.

Therefore, a new technical solution is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a new technical scheme of battery.

According to an aspect of the present invention, a battery is provided. This battery includes roll core, casing and utmost point ear the inside of casing is provided with and holds the chamber, it is located to roll up the core hold the intracavity, the casing is including two end covers that set up relatively, roll up the core including respectively with two the relative two terminal surfaces that set up of end cover, it is the spiral winding structure to roll up the core, the middle part vacuole formation of spiral winding structure, roll up the core including being close to the top of cavity, utmost point ear with roll up being close to of core the position welding of top, utmost point ear still include by roll up the outside connecting portion of drawing forth of core, connecting portion are circularly, the laminating of connecting portion is in on the terminal surface, connecting portion cover the cavity, connecting portion are connected with the end cover.

Optionally, roll up core and include positive plate, negative pole piece and barrier film, the barrier film is located the positive plate with between the negative pole piece, utmost point ear includes anodal ear and negative pole ear, anodal ear with the positive plate is connected, the negative pole ear with the negative pole piece is connected, the negative pole ear for anodal ear is closer to the top.

Optionally, the connection portion of the negative tab and the connection portion of the positive tab are both arranged concentrically with the end face where the connection portion of the negative tab is located, and the diameter of the connection portion of the negative tab is smaller than that of the connection portion of the positive tab.

Optionally, an insulating gasket is disposed between the connection portion of the positive tab and the end face, an edge of the insulating gasket protrudes beyond an edge of the connection portion of the positive tab, and an area of the insulating gasket is smaller than an area of the end face.

Optionally, when winding is performed, the negative plate protrudes from the positive plate along the winding direction, the negative electrode tab is connected to a portion of the negative plate protruding from the positive plate, and the connecting portion of the negative electrode tab on the end face covers the cavity and the portion of the negative plate protruding from the positive plate.

Optionally, the middle part of the end cap is an arc-shaped structure protruding towards the direction of the winding core, and the connecting part of the tab is attached to the arc-shaped structure.

Optionally, the connecting portion is welded to the end cap.

Optionally, the connecting portion and the end cap are welded together by using a double-needle welding head.

Optionally, the utmost point ear include the stalk portion with connecting portion, the stalk portion with connecting portion connect, the stalk portion with roll up the core and connect, connecting portion are circular, the stalk portion is the strip, the diameter of connecting portion is greater than the width of stalk portion.

According to another aspect of the present disclosure, an electronic device is provided. The electronic equipment comprises the battery.

The utility model has the advantages of because the connecting portion of utmost point ear are circular and the laminating is on the terminal surface of rolling up the core, when filling, discharging, roll up the core and have the electric current, connecting portion also have the electric current. Because the connecting part is circular, the magnetic field formed by the connecting part is uniformly distributed, so that the change of the magnetic field of the electric element around the battery caused by the nonuniform distribution of the magnetic field is avoided. In this way, the electromagnetic interference of the battery to surrounding electrical components is significantly reduced.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a perspective view of a battery according to an embodiment of the present disclosure.

Fig. 2 is a view from another angle of fig. 1.

Fig. 3 is a cross-sectional view of a battery according to an embodiment of the present disclosure.

Fig. 4 is a perspective view of a winding core according to an embodiment of the present disclosure.

Fig. 5 is a view from another angle of fig. 4.

Fig. 6 is a perspective view of a portion of a negative electrode tab according to an embodiment of the present disclosure.

Fig. 7 is a perspective view of a portion of a positive tab according to an embodiment of the present disclosure.

Description of reference numerals:

101. a first end cap; 102. a second end cap; 103. a cambered surface structure; 104. a first side wall; 105. a second side wall; 106. an insulating sleeve;

201. a positive tab; 202. a negative tab; 203. a connecting portion; 204. a handle; 205. welding spots;

300. a winding core; 301. a positive plate; 301a, a positive current collector; 301b, a positive electrode active material; 302. a negative plate; 302a, a negative electrode current collector; 302b, a negative electrode active material; 303. a first end face; 304. a second end face; 305. an insulating spacer; 306. an isolation film; 307. a cavity.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to one embodiment of the present disclosure, a battery is provided. As shown in fig. 1 to 3, the battery includes: including rolling up core 300, casing and utmost point ear the inside of casing is provided with and holds the chamber, it is located to roll up core 300 hold the intracavity, the casing is including two end covers that set up relatively, roll up core 300 include respectively with two the relative two terminal surfaces that set up of end cover, it is spiral winding structure to roll up core 300, spiral winding structure's middle part vacuole formation 307, roll up core 300 including being close to the top of cavity 307, utmost point ear with roll up being close to of core 300 the position welding of top, utmost point ear still include by roll up the outside connecting portion 203 of drawing forth of core 300, connecting portion 203 is circular, connecting portion 203 laminates on the terminal surface, connecting portion 203 covers cavity 307, connecting portion 203 is connected with the end cover.

Specifically, as shown in fig. 1 and 2, the battery is a cylindrical battery, for example, a cylindrical battery or a prismatic battery. The battery is a button cell battery under the condition that the height of the battery is smaller than the diameter. The battery may be, but is not limited to, a lithium ion battery, a nickel cadmium battery, a lead acid battery, and the like. The winding core 300 includes a plurality of electrode tabs and a separator 306, for example, a positive electrode tab 301 and a negative electrode tab 302 are respectively located on both sides of the separator 306. The plurality of electrode sheets are spirally wound to form the winding core 300.

The positive electrode sheet 301 includes a positive electrode collector 301a and a positive electrode active material 301b attached to at least one surface of the positive electrode collector 301a. The negative electrode tab 302 includes a negative electrode collector 302a and a negative electrode active material 302b attached to at least one surface of the negative electrode collector 302a. The positive electrode collector 301a is an aluminum foil. The negative electrode collector 302a is a copper foil. The positive electrode active material 301b is lithium cobaltate, lithium iron phosphate, a ternary material, or the like. The negative electrode active material 302b is graphite, silicon, or the like. The positive electrode sheet 301, the separator 306, and the negative electrode sheet 302 are wound to form a winding core 300. The winding core 300 has a first end face 303 and a second end face 304.

The shell is made of stainless steel, copper alloy, aluminum alloy and the like. For example, the housing includes a first shell and a second shell that snap together. The first housing and the second housing each include an end cap and a sidewall connected to the end cap. The first housing includes a first sidewall 104 and a first end cap 101. The second housing includes a second sidewall 105 and a second end cap 102. The first end cap 101 is disposed opposite the first end face 303 of the winding core 300. The second end cap 102 is disposed opposite the second end 304 of the winding core 300. The first shell and the second shell are both of a cylindrical structure with one end open. The first housing and the second housing are sealingly coupled together in an open-ended opposing manner to form a pocket therebetween. The first side wall 104 and the second side wall 105 at least partially overlap. An insulating sleeve 106 is provided between the two side walls. The winding core 300 is disposed within the receiving cavity.

Alternatively, the first sidewall 104 and the second sidewall 105 may not coincide. The two side walls are connected together by a connecting member to form a receiving chamber inside the first and second housings.

The housing may further include a lower case and an upper cover. One end of the lower case has an open end. The upper cover is of a sheet structure or is further provided with a convex edge around the sheet structure. An upper cover is sealingly disposed at the open end to form a receiving cavity therebetween. The winding core 300 is disposed within the receiving cavity. An annular gasket is provided around the upper cover to seal the upper cover to the lower case. In this example, the end cap includes an upper cover and a bottom of the lower shell opposite the upper cover.

Of course, the structure of the housing is not limited to the above-mentioned embodiments, and those skilled in the art can set the configuration according to actual needs.

In this example, as shown in fig. 6 and 7, the tab includes a connection portion 203 for electrical connection with the end cap. For example, the tab further includes a shank 204 connected to the connection portion 203. The stem 204 is integrally formed with the connecting portion 203, for example, by punching or laser cutting. The shank 204 is welded to the electrode sheet, for example, by laser welding, ultrasonic welding, resistance welding, or the like. The tab is of a sheet structure. The material of the tab may be, but is not limited to, copper, aluminum, etc. For example, the positive tab 201 is aluminum foil. The negative electrode tab 202 is a copper foil. The handle portion 204 of the positive tab 201 is welded to the positive current collector 301a. The handle 204 of the negative tab 202 is welded to the negative current collector 302a.

In the embodiment of the present disclosure, since the connection portion 203 of the tab is circular and is attached to the end surface of the winding core 300, current flows in the winding core 300 and also in the connection portion 203 when charging and discharging are performed. Since the connection portion 203 is circular, the magnetic field formed by the connection portion 203 is uniformly distributed, thereby preventing the magnetic field of the electric elements around the battery from being changed due to the non-uniform distribution of the magnetic field. In this way, the electromagnetic interference of the battery to surrounding electrical components is significantly reduced.

In one example, the winding core 300 includes the positive electrode tab 301, the negative electrode tab 302, and the separator 306, as described above. As shown in fig. 3, the separator 306 is located between the positive electrode tab 301 and the negative electrode tab 302. The tabs include a positive tab 201 and a negative tab 202. The positive tab 201 is connected to the positive tab 301. The negative tab 202 is connected to the negative plate 302. The negative electrode tab 202 is closer to the start end than the positive electrode tab 201.

As shown in fig. 6, the end of the negative electrode sheet 302 forms a region not covered with the negative electrode active material 302b. This region exposes the negative electrode collector 302a. The shank 204 of the negative tab 202 is welded to the negative current collector 302a using laser welding. The connection portion 203 of the positive electrode tab 201 is located on the side of the negative electrode tab 302.

As shown in fig. 7, a region not covered with the positive electrode active material 301b is formed inside the end portion of the positive electrode sheet 301. This region exposes the positive electrode collector 301a. The shank 204 of the positive tab 201 is welded to the positive current collector 301a by laser welding. The connection portion 203 of the positive tab 201 is located on the side of the positive tab 301.

During winding, the end of the negative electrode tab 302 protrudes beyond the end of the positive electrode tab 301, and the positive electrode tab 201 and the negative electrode tab 202 are arranged in a staggered manner.

In this example, the end of the negative electrode sheet 302 is not flush with the end of the positive electrode sheet 301 when winding. The end of the negative electrode tab 302 protrudes beyond the end of the positive electrode tab 301. The negative electrode sheet 302 can completely cover the positive electrode sheet 301, and the area of the negative electrode sheet 302 is larger than that of the positive electrode sheet 301, so that the positive electrode can be sufficiently charged and discharged. The closer the negative electrode tab 202 is to the beginning with respect to the positive electrode tab 201, this enables the electrode active material of the positive electrode sheet 301 to sufficiently perform charge and discharge reactions.

In one example, both the connection portion 203 of the negative tab 202 and the connection portion 203 of the positive tab 201 are disposed concentrically with the end surface on which they are disposed. The diameter of the connection portion 203 of the negative tab 202 is smaller than the diameter of the connection portion 203 of the positive tab 201.

In this example, as shown in fig. 3, the distance from the position where the negative electrode tab 202 is drawn out to the center of the spirally wound structure is smaller because the negative electrode tab 202 is closer to the starting end. The distance of the lead-out position of the positive tab 201 with respect to the center of the spirally wound structure is larger. Therefore, connection portion 203 of positive tab 201 needs to cover a larger area than negative tab 202 to ensure coverage of cavity 307 and be disposed concentrically with the end face. The area of the connection part 203 of the negative tab 202 is smaller, so that on one hand, the material can be saved; and on the other hand, reduces the space in the accommodating cavity occupied by the negative electrode tab 202.

It should be noted that the connection portion 203 of the positive tab 201 and the connection portion 203 of the negative tab 202 are both concentrically disposed with the end surface of the winding core 300, so that the magnetic field formed by the winding core 300 and the tabs is more uniform, and the magnetic field of the electrical element around the battery is prevented from changing.

In other examples, a stem is disposed within the cavity 307. In the spiral winding, the positive electrode sheet 301, the negative electrode sheet 302, and the separator 306 are wound around the stem. This makes the structure of the winding core 300 more regular.

In one example, as shown in fig. 3 and 5, an insulating spacer 305 is provided between the connection portion 203 of the positive electrode tab 201 and the end surface. The edge of the insulating pad 305 protrudes from the edge of the connection portion 203 of the positive tab 201. The insulating spacer 305 has an area smaller than that of the end face.

In this example, since the negative electrode tab 202 is located closer to the starting end than the positive electrode tab 201, a part of the negative electrode tab 302 is present in the region of the end surface covered by the connection portion 203 of the positive electrode tab 201. In this way, the insulating spacer 305 is provided between the connection portion 203 of the positive electrode sheet 301 and the end face, and occurrence of short circuit can be effectively avoided.

In addition, the area of the insulating gasket 305 is larger than that of the connecting part 203 of the positive tab 201, and the insulating gasket 305 is arranged concentrically with the connecting part 203 of the positive tab 201, so that the occurrence of short circuit can be avoided more effectively. The area of insulating spacer 305 is smaller than the area of the end surface where the device is located, which can effectively reduce the space occupied by insulating spacer 305 in the accommodating cavity.

Of course, the insulating pad 305 and the connection portion 203 of the positive tab 201 may be arranged eccentrically, as long as it is ensured that the edge of the insulating pad 305 protrudes beyond the edge of the connection portion 203 of the positive tab 201.

In one example, the negative electrode tab 302 protrudes from the positive electrode tab 301 in the winding direction when the winding is performed. The negative electrode tab 202 is connected with the part of the negative electrode plate 302 protruding from the positive electrode plate 301. The connection portion 203 of the negative electrode tab 202 covers the cavity 307 and the portion of the negative electrode tab 302 protruding from the positive electrode tab 301 on the end surface.

In this example, as shown in fig. 3 and 4, the end of the negative electrode tab 302 protrudes beyond the end of the positive electrode tab 301. The handle 204 of the negative electrode tab 202 is connected to a portion protruding from the positive electrode tab 301. Therefore, when the connection portion 203 of the negative electrode tab 302 is bonded to the first end surface 303, the region that needs to be covered by the connection portion 203 of the negative electrode tab 302 does not have the positive electrode tab 301, that is, the positive electrode tab 301 and the negative electrode tab 302 are not short-circuited. Therefore, the insulating spacer 305 does not need to be provided between the connection portion 203 of the negative electrode tab 302 and the first end surface 303, which can save the space of the housing cavity.

In one example, the end cap has a central curved surface 103 that protrudes toward the winding core 300. The connecting portion 203 of the tab is attached to the cambered surface structure 103.

As shown in fig. 2, the middle portions of the first and second end caps 101 and 102 are each protruded inward to form the arc structure 103. In this way, the cambered surface structure 103 can more effectively press the connecting portion 203 of the tab, so that the distance between the end cover and the corresponding tab is smaller. The contact area of the two is larger, the resistance is smaller, and therefore the heating phenomenon of the battery is reduced.

In one example, the connection 203 is welded to the end cap. For example, laser welding, resistance welding, etc. are used for welding.

When laser welding or resistance welding is performed from the outer side of the shell, the arc-shaped structure 103 can effectively avoid the insufficient welding phenomenon.

For example, as shown in fig. 4 and 5, resistance welding is performed using a double-needle horn. The double-needle welding head is applied to the arc surface structure 103 from the outer side of the shell, the arc surface structure 103 is further extruded, after the double-needle welding head is conducted, two welding spots 205 are formed on the arc surface structure 103 and the connecting portion 203 of the corresponding lug, and due to the compression effect of the arc surface structure 103, the welding efficiency of resistance welding of the double-needle welding head is higher, and the false welding phenomenon between the end cover and the lug is effectively avoided.

Of course, in other examples, a welding method such as projection welding may be used.

In one example, the tab includes a shank 204 and the connection portion 203, as previously described. The shank 204 is connected to the connecting portion 203. The handle 204 is attached to the winding core 300. As shown in fig. 6 and 7, the connecting portion 203 is circular, and the handle portion 204 is strip-shaped. The diameter of the connecting portion 203 is larger than the width of the shank portion 204. In this way, the connection portion 203 has a large area, so that electrical connection of the connection portion 203 and the end cap becomes easy, and the resistance therebetween is small. When welding, the welding operation space is large.

According to another embodiment of the present disclosure, an electronic device is provided. The electronic equipment comprises the battery.

The electronic device may be, but is not limited to, a computer, a cell phone, a television, a radio, a watch, a headset, an intercom, a VR device, an AR device, etc.

The electronic device includes a device main body and a battery. The battery is disposed within the device body.

The electronic equipment has the characteristic of high signal-to-noise ratio.

In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. The utility model provides a battery, its characterized in that, including rolling up core, casing and utmost point ear the inside of casing is provided with and holds the chamber, it is located to roll up the core hold the intracavity, the casing is including two end covers that set up relatively, roll up the core including respectively with two the relative two terminal surfaces that set up of end cover, it is spiral winding structure to roll up the core, spiral winding structure's middle part vacuole formation, roll up the core including being close to the top of cavity, utmost point ear with roll up being close to of core the position welding of top, utmost point ear still include by roll up the outside connecting portion of drawing forth of core, connecting portion are circular, the laminating of connecting portion is in on the terminal surface, connecting portion cover the cavity, connecting portion are connected with the end cover.

2. The battery of claim 1, wherein the winding core comprises a positive tab, a negative tab and a separator, the separator is located between the positive tab and the negative tab, the tabs comprise a positive tab and a negative tab, the positive tab is connected to the positive tab, the negative tab is connected to the negative tab, and the negative tab is closer to the beginning end than the positive tab.

3. The battery according to claim 2, wherein the connection portion of the negative tab and the connection portion of the positive tab are both disposed concentrically with the end face on which they are disposed, and the diameter of the connection portion of the negative tab is smaller than the diameter of the connection portion of the positive tab.

4. The battery according to claim 2, wherein an insulating gasket is provided between the connection portion of the positive tab and the end face, an edge of the insulating gasket protrudes beyond an edge of the connection portion of the positive tab, and an area of the insulating gasket is smaller than an area of the end face.

5. The battery according to claim 2, wherein the negative electrode tab protrudes from the positive electrode tab in a winding direction when the winding is performed, the negative electrode tab is connected to a portion of the negative electrode tab protruding from the positive electrode tab, and the connection portion of the negative electrode tab covers the cavity and the portion of the negative electrode tab protruding from the positive electrode tab on the end surface.

6. The battery of claim 1, wherein the middle portion of the end cap is a cambered structure protruding toward the winding core, and the connection portion of the tab is attached to the cambered structure.

7. The battery of any of claims 1-6, wherein the connection is welded to the end cap.

8. The battery of claim 7, wherein the connecting portion and the end cap are welded together using a double needle welding head.

9. The battery of any of claims 1-6, wherein the tab comprises a shank portion and the connecting portion, the shank portion is connected with the jelly roll, the connecting portion is circular, the shank portion is strip-shaped, and the diameter of the connecting portion is greater than the width of the shank portion.

10. An electronic device, characterized in that it comprises a battery according to any one of claims 1-9.

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