CN115133198A

CN115133198A - Battery structure and electronic equipment

Info

Publication number: CN115133198A
Application number: CN202210897536.2A
Authority: CN
Inventors: 刘祖超; 魏强
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-09-30

Abstract

The application discloses battery structure and electronic equipment, battery structure includes: the device comprises a shell, a first sealing body and a second sealing body, wherein the shell comprises a main shell body and a top sealing body, the top sealing body is connected with the main shell body, the main shell body is provided with a first accommodating cavity with an opening, and the top sealing body is provided with a second accommodating cavity communicated with the opening of the first accommodating cavity; the battery cell is arranged in the first accommodating cavity, the battery cell is connected with a first lug and a second lug, and the first lug and the second lug penetrate through the opening of the first accommodating cavity, extend into the second accommodating cavity and extend out of the second accommodating cavity; at least one of the first tab and the second tab extends towards the opening of the first accommodating cavity after being bent, and extends to the second accommodating cavity after penetrating through the opening of the first accommodating cavity; the first protection layer is arranged on the outer side wall of the battery cell and located between the electrode lugs outside the battery cell, damage of the electrode lugs to the battery cell can be reduced through the first protection layer, and the risk of bringing internal short circuit is avoided.

Description

Battery structure and electronic equipment

Technical Field

The application belongs to the technical field of electronic equipment, and particularly relates to a battery structure and electronic equipment.

Background

Consumer electronics (mobile phones, tablets, computers, etc.) are becoming important components of people's lives, and various types of electronic devices are becoming more and more abundant. People have more and more serious dependence on electronic products, higher and more frequent use, higher and more high requirements on battery endurance and quick charging capability, and along with the improvement of battery capacity and quick charging capability, the challenge on safety performance is greater and greater, especially on the anti-falling performance of the battery. When the lithium ion battery falls, the tab inside the battery is easily damaged after being bent, and the risk of internal short circuit is brought.

Disclosure of Invention

The embodiment of the application aims to provide a battery structure and electronic equipment, which are used for solving the problem that when a battery falls, a lug inside the battery is easy to damage a battery cell and bring internal short circuit.

In a first aspect, an embodiment of the present application provides a battery structure, including:

the top sealing body is connected with the main shell, the main shell is provided with a first accommodating cavity with an opening, and the top sealing body is provided with a second accommodating cavity communicated with the opening of the first accommodating cavity;

the battery cell is arranged in the first accommodating cavity, the battery cell is connected with a first lug and a second lug, and the first lug and the second lug penetrate through an opening of the first accommodating cavity, extend into the second accommodating cavity and extend out of the second accommodating cavity;

at least one of the first tab and the second tab bends and then extends towards the opening of the first accommodating cavity and passes through the opening of the first accommodating cavity to extend to the second accommodating cavity;

the first protection layer is arranged on the outer side wall of the battery cell and located between the lugs outside the battery cell.

The first pole lug and the second pole lug are arranged on one side close to the main shell, and the opening is arranged on the other side close to the main shell.

The number of the first protection layers is multiple, and the first protection layers are arranged at intervals.

Wherein, the first protective layer is provided with a hollow hole.

Wherein, the first protective layer is an elastic layer.

Wherein the material of the first protective layer comprises at least one of polypropylene, acrylic rubber, ethylene-vinyl acetate copolymer and rubber.

The first protective layer comprises a base material and an adhesive layer, and the base material and the adhesive layer are arranged in a laminated mode.

Wherein, battery structure still includes:

the second protective layer is located outside the battery cell, and the second protective layer is arranged between the inner side wall of the first accommodating cavity and the lug located outside the battery cell.

The top seal body is L-shaped, the top seal body comprises a first top seal body and a second top seal body, one end of the first top seal body is vertically connected with the main shell, the other end of the first top seal body is connected with the second top seal body, and the second top seal body and the main shell are arranged at intervals;

the second holds the chamber and is the L type, the second holds the chamber and follows the one end tip of top seal body extends to the other end tip of top seal body, first utmost point ear with the second utmost point ear passes first opening edge that holds the chamber the second holds the chamber and extends.

And the parts of the first pole lug and the second pole lug in the second accommodating cavity are both L-shaped.

Wherein, battery structure still includes:

the main board is arranged on one side, far away from the main shell, of the second top sealing body, and the first pole lug and the part, extending out of the second containing cavity, of the second pole lug are electrically connected with the main board.

The outer side of a first electrode lug in the first accommodating cavity is coated with a first insulating protective film, and the outer side of a second electrode lug in the first accommodating cavity is coated with a second insulating protective film.

Wherein, the electricity core includes:

the battery comprises a first electrode plate, a second electrode plate and an isolation film, wherein the first electrode plate, the second electrode plate and the isolation film are positioned between the first electrode plate and the second electrode plate, the isolation film is wound into the battery core, the first electrode tab is electrically connected with the first electrode plate, and the second electrode tab is electrically connected with the second electrode plate.

In a second aspect, embodiments of the present application provide an electronic device, including the battery structure described in the above embodiments.

In the battery structure of this application embodiment, electric core set up in the first chamber that holds, first utmost point ear with at least one utmost point ear orientation after buckling in the second utmost point ear the first opening that holds the chamber extends, and passes the first opening that holds the chamber extends to the second holds the chamber, first protective layer set up in the lateral wall of electric core with be located between the outside utmost point ear of electric core. The damage of the lug to the battery cell can be reduced by arranging the first protection layer between the battery cell and the lug positioned outside the battery cell. When the lithium ion battery falls, because of the existence of the first protective layer, the tab can not be in direct contact with the battery cell, so that the damage of the tab to the battery cell can be reduced, and the risk of bringing internal short circuit is avoided.

Drawings

FIG. 1 is a cross-sectional view of a battery construction;

fig. 2a is a schematic structural diagram of a battery cell;

fig. 2b is a schematic diagram of the first protection layer and the battery cell;

FIG. 2c is a schematic illustration of the shell forming process;

fig. 2d is a schematic diagram of the cell and the casing;

FIG. 2e is a schematic diagram of a cell structure;

fig. 3a is a schematic structural diagram of a battery cell;

fig. 3b is another schematic diagram of the first protection layer cooperating with the battery cell;

FIG. 3c is another schematic illustration of the housing forming process;

fig. 3d is another schematic diagram of the cell and the casing being engaged;

FIG. 3e is another schematic diagram of a cell structure;

fig. 4 is another schematic diagram of the first protective layer being engaged with the battery cell;

FIG. 5 is a schematic structural diagram of a first passivation layer;

fig. 6 is yet another schematic diagram of a battery structure.

Reference numerals

A main housing 10; a first accommodation chamber 11; an opening 12;

a top seal body 20; the second accommodation chamber 21; a first top seal body 201; a second top seal body 202;

a battery cell 30;

a first tab 31; a second tab 32;

a first insulating protective film 33; a second insulating protective film 34;

a main board 40; a conductive member 41;

a first electrode sheet 51; a second electrode sheet 52; a separator 53;

a first protective layer 61; a second protective layer 62; and a hollowed-out hole 63.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be implemented in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The following describes in detail the battery structure provided in the embodiments of the present application with reference to fig. 1 to 6 through specific embodiments and application scenarios thereof.

As shown in fig. 1 to 6, the battery structure of the embodiment of the present application includes: the battery comprises a shell, a battery cell 30 and a first protective layer 61, wherein the shell may comprise a main shell 10 and a top sealing body 20, the top sealing body 20 is connected with the main shell 10, and the top sealing body 20 and the main shell 10 may be integrally formed. The main casing 10 has a first receiving chamber 11 with an opening 12, and the top casing 20 has a second receiving chamber 21 communicating with the opening 12 of the first receiving chamber 11. The main housing 10 and the top sealing body 20 may be rectangular parallelepiped, the top sealing body 20 may be perpendicular to the surface of the main housing 10, and the first accommodating cavity 11 and the second accommodating cavity 21 may be rectangular parallelepiped. The battery cell 30 may be disposed in the first accommodating cavity 11, the battery cell 30 is connected with a first tab 31 and a second tab 32, the first tab 31 and the second tab 32 may pass through the opening 12 of the first accommodating cavity 11 and extend into the second accommodating cavity 21, and the first tab 31 and the second tab 32 extend out of the second accommodating cavity 21.

At least one of the first tab 31 and the second tab 32 is bent and then extends toward the opening of the first accommodating cavity 11, and passes through the opening of the first accommodating cavity 11 to extend to the second accommodating cavity 21. An insulating spacer layer may be disposed between the first tab 31 and the second tab 32, and the first tab 31 and the second tab 32 may be isolated and insulated by the insulating spacer layer to prevent contact between the first tab 31 and the second tab 32. The surfaces of the first tab 31 and the second tab 32 may be covered with an insulating layer, and the insulating layer may have a protective effect. The first protective layer 61 may be disposed outside the battery cell 30, and the first protective layer 61 may be disposed between an outer sidewall of the battery cell 30 and a tab located outside the battery cell 30. First protective layer 61 can be the glue film, and first protective layer 61 can be the elastic layer, has the cushioning effect, alleviates the damage of utmost point ear to electric core. The first protective layer 61 may have a pore structure to facilitate the flow of the electrolyte in the pores. The shape of the first protective layer 61 may be a linear type or a sheet type, and may cover a region where the tabs contact. By providing the first protective layer 61 between the battery cell 30 and the tab located outside the battery cell 30, damage of the tab to the battery cell can be reduced. The battery structure can be applied to the lithium ion battery, and when the battery falls, because the existence of first protective layer 61, utmost point ear and electric core 30 can not direct contact, can reduce the damage of utmost point ear to electric core, avoid bringing the risk of inside short circuit.

In some embodiments, as shown in fig. 1, 2d, 2e, 3d, 3e, and 6, the first tab 31 and the second tab 32 may be disposed near one side of the main housing 10, and the opening 12 may be disposed near the other side of the main housing 10. The first tab 31 and the second tab 32 are bent and extend toward the opening 12 of the first accommodating cavity 11, and extend to the second accommodating cavity 21 through the opening 12 of the first accommodating cavity 11.

In other embodiments, as shown in fig. 4, the number of the first protection layers 61 may be multiple, multiple first protection layers 61 may be disposed at intervals, and a gap may be formed between adjacent first protection layers 61 to facilitate the flow of the electrolyte.

Alternatively, as shown in fig. 4 and 5, the first protection layer 61 may have a hollow hole 63, the first protection layer 61 may have a plurality of hollow holes 63, and the plurality of hollow holes 63 may be distributed at intervals, for example, the plurality of hollow holes 63 may be distributed at even intervals, and the flow of the electrolyte is facilitated through the hollow holes 63.

Optionally, the first protection layer 61 may be an elastic layer, and has a buffering effect, so that damage of the tab to the battery cell may be reduced.

Alternatively, the material of the first protection layer 61 may include at least one of polypropylene, acrylic glue, ethylene-vinyl acetate copolymer and rubber, for example, the material of the first protection layer 61 may include polypropylene or acrylic glue, and the material of the first protection layer 61 may include polypropylene and acrylic glue, and the specific material may be selected according to the actual application.

Optionally, the first protection layer 61 may include a substrate and a glue layer, where the substrate and the glue layer may be stacked, and the glue layer may be disposed near the battery cell 30, and may be bonded to the battery cell 30 through the glue layer. The glue film can be the elastic layer, has the cushioning effect, can alleviate the damage of utmost point ear to electric core. The substrate may be polyethylene terephthalate (PET) and the glue layer may be polypropylene or acrylic glue.

In some embodiments, as shown in fig. 6, the battery structure may further include: the second protective layer 62, the second protective layer 62 may be located outside the electric core 30, the second protective layer 62 may be disposed between the first inner sidewall that holds the cavity 11 and the tab that is located outside the electric core 30, and the damage to the tab and the electric core caused by the first inner sidewall that holds the cavity 11 may be reduced through the second protective layer 62. The second protective layer 62 may be an elastic layer, and has a buffering effect, so as to reduce the damage to the tab and the battery cell caused by the inner side wall of the first accommodating cavity 11. The second protective layer 62 may have a pore structure to facilitate the flow of the electrolyte. The second passivation layer 62 may have a plurality of holes, and the plurality of holes may be distributed at intervals, for example, the plurality of holes may be distributed at regular intervals, and the flow of the electrolyte is facilitated through the holes.

In the embodiment of the present application, as shown in fig. 1, fig. 2e, fig. 3e, and fig. 6, the top sealing body 20 is L-shaped, the top sealing body 20 may include a first top sealing body 201 and a second top sealing body 202, one end of the first top sealing body 201 may be vertically connected to the main case 10, the other end of the first top sealing body 201 is connected to the second top sealing body 202, the second top sealing body 202 is spaced from the main case 10, the second top sealing body 202 may be spaced from the main case 10 by a certain distance, the second top sealing body 202 may extend around the circumference of the main case 10, the top sealing region of the main case 10 may be supported by the top sealing body 20, and the battery core is prevented from moving from the top sealing region to flush the top sealing region when the battery drops. An elastic layer can be arranged between the second top seal body 202 and the main casing body 10, so that a buffering effect is achieved, the impact of the battery core from the top seal area to the second top seal body 202 when the battery falls is reduced, and the risk of opening the top seal packaging area is reduced.

The second holds the chamber 21 and can be the L type, and the second holds the chamber 21 and extends to the other end tip of top seal body 20 from the one end tip of top seal body 20, and the second holds the chamber 21 and can run through from the both ends tip of top seal body 20, and first utmost point ear 31 and second utmost point ear 32 pass first opening 12 that holds the chamber 11 and extend along the second chamber 21 that holds. The first tab 31 and the second tab 32 can protrude from an end of the second receiving cavity 21 away from the main housing 10, so that the first tab 31 and the second tab 32 can be led out and electrically connected to the main board 40. The portions of the first tab 31 and the second tab 32 in the first receiving cavity 11 may be bent, and the portions of the first tab 31 and the second tab 32 in the second receiving cavity 21 may be bent. The top seal area of the main housing 10 can be supported by the top seal body 20, so that the battery core is prevented from moving from the top seal area to push the top seal packaging area when the battery falls.

Alternatively, as shown in fig. 1, fig. 2e, fig. 3e and fig. 6, the portions of the first tab 31 and the second tab 32 in the second receiving cavity 21 may be L-shaped. The first tab 31 and the second tab 32 located in the second accommodating cavity 21 may be bent and extended along the bending direction of the seal body 20, and the shapes of the first tab 31 and the second tab 32 may correspond to the bending shape of the seal body 20, so as to facilitate the extension of the tabs. The bending positions of the portions of the first tab 31 and the second tab 32 in the second accommodating cavity 21 may be different, and the bending positions of the portions of the first tab 31 and the second tab 32 in the second accommodating cavity 21 may be spaced apart by a certain distance, which may reduce the risk of short circuit.

In some embodiments, as shown in fig. 1 and 6, the battery structure may further include: the main board 40, the main board 40 is disposed on a side of the second top sealing body 202 away from the main housing 10, and the portions of the first tab 31 and the second tab 32 protruding out of the second receiving cavity 21 can be electrically connected to the main board 40. The parts of the first tab 31 and the second tab 32 extending out of the second receiving cavity 21 may be electrically connected to a main board 40 through a conductive member 41, the main board 40 may have an electrical component thereon, and the conductive member 41 may be a nickel plate.

In the embodiment of the present application, as shown in fig. 2a, 2b, 3a and 3b, the outside of the first tab 31 located in the first receiving cavity 11 may be coated with a first insulation protection film 33, and the outside of the second tab 32 located in the first receiving cavity 11 may be coated with a second insulation protection film 34. The insulation protection film can be an insulation adhesive tape, and the pole lugs can be protected through the insulation protection film, so that short circuit of the pole lugs is prevented. The outside of the first tab 31 located in the second accommodating cavity 21 can also be coated with a first insulating protection film 33, the outside of the second tab 32 located in the second accommodating cavity 21 can also be coated with a second insulating protection film 34, and the tabs can be protected by the insulating protection films to prevent the tabs from short circuit.

Optionally, as shown in fig. 2a to 2b, fig. 2d to 2e, fig. 3a to 3b, fig. 3d, and fig. 3e, the battery cell 30 may include: the first electrode sheet 51, the second electrode sheet 52 and the separator 53 are wound into the battery cell 30, the first electrode sheet 51, the second electrode sheet 52 and the separator 53 located between the first electrode sheet 51 and the second electrode sheet 52 are electrically connected, the first tab 31 is electrically connected to the first electrode sheet 51, and the second tab 32 is electrically connected to the second electrode sheet 52. The first tab 31 may be a positive tab, and the second tab 32 may be a negative tab; alternatively, the first tab 31 may be a negative tab and the second tab 32 may be a positive tab. The first electrode sheet 51, the second electrode sheet 52, and the separator 53 between the first electrode sheet 51 and the second electrode sheet 52 are wound into the battery cell 30, and the first tab 31 and the first electrode sheet 51 may be electrically connected, and the second tab 32 and the second electrode sheet 52 may be electrically connected.

The battery cell 30 may have a winding structure, and the first tab 31 and the second tab 32 may both extend from the same side of the lower half portion of the battery cell 30, and may be bent at the top in the manner of fig. 2e, and then the main board 40 is welded to the tabs. As shown in fig. 2a, the battery cell 30 may use a winding structure, the first tab 31 and the second tab 32 may be welded on the same side of the battery cell 30, and the first electrode sheet 51, the second electrode sheet 52 and the separator 53 are wound to form the battery cell 30; then, the first protection layer 61 is attached to the battery cell 30 in the manner shown in fig. 2b, the first protection layer 61 covers the upper half portion of the battery cell 30 corresponding to the bending of the tab, and the battery cell 30 with the first protection layer 61 attached can be packaged into a casing by using an aluminum plastic film (as shown in fig. 2 c) with a pit punched in advance in the manner shown in fig. 2 d. Fig. 2c shows an aluminum-plastic film with a pit punched in advance, where a portion a of the aluminum-plastic film may be bent to be connected with a portion b to form a casing, as shown in fig. 2d, a battery core may be encapsulated by the aluminum-plastic film with the pit punched in advance, one side of the battery core 30 where a tab is welded may be placed in the aluminum-plastic film punching area, and then, the top sealing body 20 may be bent in the manner shown in fig. 2e, and the main board 40 is welded with the tab and packaged into a battery. Due to the protection effect of the first protection layer 61, the extrusion damage of the stress concentration point formed by the tabs to the battery cell 30 is weakened, the battery cell 30 is safer, and the energy density and the drop resistance of the battery are improved.

In order to make the electrolyte enter the battery cell 30 from the edge more easily, the size of the first protective layer 61 is smaller, the first protective layer 61 can be only attached to the contact area of the tab, as shown in fig. 3b, the first protective layer 61 can be arranged into two pieces, which are respectively attached to the longitudinal area parallel to the tab, the adhesive is more easily attached, the electrolyte can enter the battery cell 30 more easily, and meanwhile, the protection effect of the first protective layer 61 can not be reduced. As shown in fig. 3a, the battery cell 30 may use a winding structure, the first tab 31 and the second tab 32 may be welded on the same side of the battery cell 30, and the first electrode sheet 51, the second electrode sheet 52 and the separator 53 are wound to form the battery cell 30; then, two first protection layers 61 are attached to the battery cell 30 in the manner shown in fig. 3b, the first protection layers 61 cover the upper half portion of the battery cell 30 in the region corresponding to the bent tab, and the battery cell 30 with the first protection layers 61 attached can be packaged into a housing by using an aluminum-plastic film (as shown in fig. 3 c) with a pit punched in advance in the manner shown in fig. 3 d. Fig. 3c shows an aluminum-plastic film with a punched pit, where the part c of the aluminum-plastic film may be bent to be connected with the part d to form a casing, as shown in fig. 3d, the battery core 30 may be packaged by the aluminum-plastic film with a punched pit in advance, one side of the battery core 30 where a tab is welded may be placed in the punched pit area of the aluminum-plastic film, and then the top sealing body 20 may be bent in the manner shown in fig. 3e, and the main board 40 is welded with the tab and packaged into a battery. Due to the protection effect of the first protection layer 61, the extrusion damage of the stress concentration point formed by the tabs to the battery cell 30 is weakened, the battery cell 30 is safer, and the energy density and the drop resistance of the battery are improved.

The electronic device in the embodiment of the present application includes the battery structure described in the above embodiment. The electronic equipment with the battery structure in the embodiment has good anti-falling performance, and the battery core is not easy to damage after the battery falls.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A battery structure, comprising:

2. The battery structure of claim 1, wherein the first tab and the second tab are disposed proximate one side of the main housing and the opening is disposed proximate another side of the main housing.

3. The battery structure according to claim 1, wherein the number of the first protective layers is plural, and the plural first protective layers are provided at intervals.

4. The battery structure of claim 1, wherein the first protective layer has a hollowed-out hole therein.

5. The battery structure of claim 1, wherein the first protective layer is an elastic layer.

6. The battery structure of claim 1, wherein the first protective layer comprises a substrate and a glue layer, and the substrate and the glue layer are stacked.

7. The battery structure of claim 1, further comprising:

the second protective layer is located outside the battery cell and arranged between the inner side wall of the first accommodating cavity and the lug located outside the battery cell.

8. The battery structure of claim 1, wherein the top seal body is L-shaped, the top seal body comprises a first top seal body and a second top seal body, one end of the first top seal body is vertically connected with the main casing body, the other end of the first top seal body is connected with the second top seal body, and the second top seal body is arranged at a distance from the main casing body;

the second holds the chamber and is the L type, the second holds the chamber follow one end tip of top seal body extends to the other end tip of top seal body, first utmost point ear with the second utmost point ear passes first opening edge that holds the chamber the second holds the chamber and extends.

9. The battery structure of claim 8, wherein the portions of the first and second tabs in the second receiving cavity are L-shaped.

10. The battery structure of claim 8, further comprising:

11. The battery structure as claimed in claim 1, wherein the first tab in the first receiving cavity is externally coated with a first insulation protection film, and the second tab in the first receiving cavity is externally coated with a second insulation protection film.

12. The battery structure of claim 1, wherein the cell comprises:

13. An electronic device, characterized in that it comprises a battery structure according to any one of claims 1 to 12.