CN218996884U

CN218996884U - Battery shell and secondary battery

Info

Publication number: CN218996884U
Application number: CN202320017309.6U
Authority: CN
Inventors: 潘磊; 宋林霏; 张化瑞; 徐敏; 朱振东
Original assignee: Hefei Guoxuan High Tech Power Energy Co Ltd
Current assignee: Hefei Gotion High Tech Power Energy Co Ltd
Priority date: 2023-01-04
Filing date: 2023-01-04
Publication date: 2023-05-09
Anticipated expiration: 2033-01-04

Abstract

The utility model relates to a battery shell and a secondary battery, and belongs to the field of new energy power batteries. The utility model provides a battery shell, which comprises a cylindrical shell, wherein a cavity is formed in the axial direction of the cylindrical shell, the cavity is provided with a bottom, a peripheral side part and an opening, a cover plate is arranged at the opening of the cavity, and two through grooves penetrating through the peripheral side part are formed in the peripheral side surface of the shell; a secondary battery is also provided, using a battery case, and inserting a battery cell into the battery case. The through grooves are arranged on the peripheral side surface of the cylindrical outer shell and used for arranging the connecting sheets to lead out the current of the battery core, and the battery core is not required to be connected through structures such as pole posts and the like arranged at the two ends of the outer shell, so that the structure of the secondary battery is simplified, the space utilization rate of an electrode assembly in the secondary battery is increased, the energy density of the secondary battery is improved, and the heat dissipation effect of the two large end surfaces of the outer shell is enhanced.

Description

Battery shell and secondary battery

Technical Field

The utility model relates to the field of new energy power batteries, in particular to a battery shell and a secondary battery.

Background

Secondary batteries are widely used in various fields as a chemical energy storage device that can be repeatedly charged and discharged. The lithium ion battery has the advantages of high voltage, long charge and discharge life, high energy density, small environmental pollution, low self-discharge efficiency and the like, is widely applied to portable electronic products such as mobile phones, notebook computers, digital cameras and the like, and is well applied to the field of electric automobiles. In order to adapt to different installation environments, square batteries, cylindrical batteries, special-shaped batteries, button batteries and the like are generated aiming at batteries used on different types of equipment.

The button cell is a cell with a larger diameter and a thinner thickness, and is generally applied to various miniature electronic products. For example, the patent publication CN112366394a, which is found by search, discloses a button cell in which a battery cell is accommodated by a cylindrical case having a large diameter and a small thickness, and current is led out and in from both ends.

The size of the button cell is enlarged under certain working environments in the field of electric automobiles, and the maximum energy storage effect can still be exerted by utilizing the structural characteristics of the button cell, but if the traditional button cell structure is directly applied, the two lugs are bent to be connected with the two end cover plates of the cell, or the two lugs are bent to be connected with the two end cover plates of the cell through the connecting sheet, the heat dissipation performance of the two end cover plates of the cell can be reduced, so that the service life of the cell is influenced, the accommodating space of the cell shell is further occupied, and the maximum electric capacity cannot be obtained.

Disclosure of Invention

1. Problems to be solved

Aiming at the problem that in the prior art, the lugs of the button cell are connected with the cover plates from the two ends of the cell to influence the heat dissipation of the two ends of the cell, the utility model provides a cell shell which can fully utilize the two end faces of the cell to dissipate heat and improve the heat dissipation performance of the cell.

The secondary battery can prevent the lugs from shielding the two ends of the battery, and improve the heat dissipation performance of the battery, so that the service life of the battery is prolonged, and electric energy can be stored to the maximum extent in a battery shell with a certain size.

2. Technical proposal

In order to solve the problems, the utility model adopts the following technical scheme.

The battery shell comprises a cylindrical shell body, wherein a cavity is formed in the axial direction of the cylindrical shell body, the cavity is provided with a bottom, a peripheral side part and an opening, a cover plate is arranged at the opening of the cavity, and two through grooves penetrating through the peripheral side part are formed in the peripheral side surface of the shell body.

Preferably, the two through grooves are symmetrically arranged at 180 ° on the peripheral side surface of the outer casing.

The secondary battery comprises the battery shell, wherein the battery core insulated from the outer shell is inserted inwards from the cavity opening of the outer shell, the battery core is provided with a positive electrode lug and a negative electrode lug, and the two through grooves respectively penetrate through a positive connecting sheet electrically connected with the positive electrode lug and a negative connecting sheet electrically connected with the negative electrode lug.

Preferably, the battery cell is formed by stacking a positive plate, a negative plate and a diaphragm between the positive plate and the negative plate, and the leading-out ends of the positive lug and the negative lug of the battery cell are led out from the peripheral side face of the battery cell and are attached to the axial end face of the battery cell.

Preferably, the positive electrode lug and the negative electrode lug are attached to the same axial end face of the battery cell.

Preferably, the edge of the through groove is provided with a flange part, and the through groove is internally and externally provided with a sealing layer of a sealing connection sheet and an injection molding layer for fixing the sealing layer.

Preferably, the cover plate is provided with a liquid injection hole and an explosion-proof valve, an insulating plate is arranged between the cover plate and the axial end face corresponding to the battery cell, the insulating plate is provided with an overflow hole corresponding to the liquid injection hole, and a ventilation part corresponding to the explosion-proof valve.

Preferably, the ventilation part comprises a groove which is recessed inwards from the middle part of the insulating plate in the axial direction, and the bottom of the groove is provided with vent holes distributed in a net shape.

Preferably, a cylindrical insulating shell matched with the insulating plate is further sleeved between the outer shell and the battery cell, and a communication port is formed in the peripheral side face of the insulating shell corresponding to the through groove.

Preferably, the bottom of the insulating shell is provided with ventilation grooves distributed in a net shape.

3. Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

(1) According to the battery shell, the through grooves are formed in the peripheral side face of the cylindrical outer shell and used for arranging the connecting sheets to lead out the current of the battery core, the battery core is not required to be connected through structures such as pole posts and the like arranged at two ends of the outer shell, and the heat dissipation effect of two large end faces of the outer shell is enhanced.

(2) According to the secondary battery provided by the utility model, the current is directly led out from the peripheral side surface of the cylindrical outer shell through the connecting sheet, so that the existence of a pole post structural member in a structure of a pole lug, an electrode connecting sheet and a pole post in the traditional secondary battery is reduced, the structure of the secondary battery is simplified, the space utilization rate of an electrode assembly in the secondary battery is increased, and the energy density of the secondary battery is improved from high.

(3) According to the secondary battery provided by the utility model, the current is directly led out from the peripheral side surface of the cylindrical outer shell through the connecting sheet, so that the shielding of heat dissipation on the end surface of the battery when the tab is led out from the two ends of the battery through the connecting sheet and the terminal post in the traditional battery structure can be avoided, the heat dissipation performance of the battery is improved, the service life of the battery is prolonged, the tab and the connecting sheet are not required to be bent in the axial direction, and the capacitance of the residual space can be improved.

Drawings

Fig. 1 is a schematic structural composition diagram of a secondary battery according to the present utility model;

FIG. 2 is an enlarged view of FIG. 1 at A;

fig. 3 is a sectional view of a secondary battery according to the present utility model;

FIG. 4 is an enlarged view at B in FIG. 3;

FIG. 5 is a structural view of a cell assembly according to the present utility model;

fig. 6 is a schematic view of an electrode sheet set according to the present utility model.

In the figure:

1. an outer housing; 2. a cavity; 201. a bottom; 202. a peripheral side portion; 203. an opening; 3. a cover plate; 4. a through groove; 5. a battery cell; 6. a positive electrode tab; 7. a negative electrode ear; 8. a positive connection piece; 9. a negative connecting piece; 10. a positive plate; 11. a negative electrode sheet; 12. a diaphragm; 13. a flange portion; 14. a sealing layer; 15. an injection molding layer; 16. a liquid injection hole; 17. an explosion-proof valve; 18. an insulating plate; 19. an overflow hole; 20. a ventilation part; 2001. a groove; 2002. a vent hole; 21. an insulating housing; 2101. a communication port; 2102. and a ventilation groove.

Detailed Description

The utility model is further described with reference to the following examples in order to facilitate the understanding of the technical means, the creation characteristics, the achievement of the objects and the effects achieved by the utility model.

Button cells are batteries having a larger diameter and a thinner thickness, and are generally used in various micro-electronic products. Along with the development of new energy battery technology and the policy guidance of energy conservation and emission reduction, various batteries have been developed for a plurality of fields such as electric automobiles, and button batteries are continuously focused by research personnel due to the structural characteristics of the button batteries, and if the button battery is required to be applied to the fields such as electric automobiles, the size of the button battery needs to be enlarged, at this time, in the traditional button battery structure, whether two lugs are bent to connect two end cover plates of the battery or connected with two end cover plates of the battery through connecting sheets after bending, the heat dissipation performance of the two end cover plates of the battery can be reduced, thereby influencing the service life of the battery, further occupying the accommodating space of the battery shell, and failing to obtain the maximum capacitance. In view of the above, the present utility model provides a battery case and a secondary battery.

Example 1

As shown in fig. 1 and 3, a battery case includes a cylindrical outer case 1 having a cylindrical or other shape structure as a whole, the cylindrical outer case 1 having a cavity 2 in an axial direction, the cavity 2 having a bottom 201, a peripheral side 202 and an opening 203 opposite to the bottom, and a cover being provided at the opening 202 to close a space of the cavity 2.

When the battery shell is used, the battery core needs to be inserted, and the battery core can be stacked or rolled. The conventional battery structure is to provide a positive electrode post and a negative electrode post at one or both end surfaces of the outer case 1 to draw out the current of the battery cell. In the battery case of the present embodiment, two through grooves 4 penetrating through the peripheral portion 202 are provided on the peripheral side surface of the outer case 1, and the through grooves may be square or circular, and may be matched with the structures of the corresponding connection pieces.

In one possible embodiment, the two through slots 4 on the outer housing 1 are arranged symmetrically at 180 ° on the peripheral side of the outer housing 1.

In another possible embodiment, the outer casing 1 has a shorter height button shape, and the two end surfaces of the battery have larger areas, thus leaving a larger heat dissipation space.

When the battery shell in the embodiment is applied, a battery core is inserted through the opening 203 of the cavity 2, the battery core extends out of the positive electrode lug and the negative electrode lug, positive and negative connecting sheets are inserted into the opening 203, and the positive and negative connecting sheets are directly and electrically connected with the corresponding positive and negative electrode sheets. Therefore, the terminal post is not required to be arranged at the end part of the battery, and the connecting sheet is not required to be bent at the two ends of the battery, so that the current of the battery core can be led out, and the heat dissipation effect of the two end surfaces of the outer shell body 1 is enhanced.

Example 2

As shown in fig. 1 and 3, in the secondary battery of example 1, a battery cell 5 insulated from the case 1 is inserted into the case 1 from an opening 203 of the cavity 2, the battery cell 5 has a positive tab 6 and a negative tab 7, and a positive connection piece 8 electrically connected to the positive tab 6 and a negative connection piece 9 electrically connected to the negative tab 7 are respectively inserted into the two through grooves 4. The current of the battery core 5 is directly led out from the peripheral side surface of the cylindrical shell body 1 through the positive connecting sheet 8 and the negative connecting sheet 9, so that the existence of a pole post structural member in a structure of a pole lug-electrode connecting sheet-pole post in the traditional secondary battery is reduced, the structure of the secondary battery is simplified, the space utilization rate of an electrode assembly in the secondary battery is increased, and the energy density of the secondary battery is improved from high.

In one possible embodiment, as shown in fig. 5 and 6, the battery cell 5 is formed by stacking a positive electrode sheet 10, a negative electrode sheet 11 and a separator 12 therebetween, and when the outer case 1 is a cylindrical case, the positive electrode sheet 10 and the negative electrode sheet 11 are also in a circular sheet structure as shown in fig. 6. The leading-out ends of the positive electrode lug 6 and the negative electrode lug 7 of the battery cell 5 are led out from the peripheral side surface of the battery cell 5 and are attached to the axial end surface of the battery cell 5. In another possible embodiment, the positive electrode tab 6 and the negative electrode tab 7 are attached to the same axial end face of the battery cell 5, so that the processing is convenient, the space can be saved to the greatest extent, and the capacitance can be improved.

In order to better seal the battery, the electrolyte is prevented from flowing out of the slits between the connection sheet and the outer case 1, as shown in fig. 2 and 4, an outwardly convex flange portion 13 is provided at the edge of the through groove 4, and a sealing layer 14 sealing the connection sheet, and an injection molding layer 15 fixing the sealing layer 14 are provided in this order from inside to outside in the through groove 4.

The cover plate 3 is provided with a liquid injection hole 16 and an explosion-proof valve 17, wherein the explosion-proof valve 17 can be arranged at the right center of the cover plate 3, and can timely burst and release pressure when the pressure in the outer shell 1 is overlarge. In addition, the battery cell 5 is insulated from the outer casing 3, and in general, the outer casing 3 is made of metal, and a layer of insulating film needs to be wrapped on the periphery of the battery cell 5. In this embodiment, an insulating plate 18 is disposed between the corresponding axial end surfaces of the cover plate 3 and the battery cell 5, and a cylindrical insulating housing 21 matched with the insulating plate 18 is sleeved between the outer housing 1 and the battery cell 5. Wherein, the insulating plate 18 is provided with an overflow hole 19 corresponding to the liquid injection hole 16, and a ventilation part 20 corresponding to the explosion-proof valve 17. The specific ventilation part 20 comprises a groove 2001 which is recessed inwards from the middle part of the insulating plate 18 in the axial direction, and a net-shaped ventilation hole 2002 is formed in the bottom of the groove 2001. Similarly, communication ports 2101 are provided on the peripheral side surface of the insulating housing 21 corresponding to the through grooves 4, and ventilation grooves 2102 distributed in a net shape are provided at the bottom of the insulating housing 21.

According to the embodiment, the current is directly led out from the peripheral side face of the cylindrical shell body 1 through the positive connecting sheet 8 and the negative connecting sheet 9, shielding of heat dissipation of the end face of the battery when the tab is led out from the two ends of the battery through the connecting sheet and the terminal post can be avoided, and the heat dissipation performance of the battery is improved, so that the service life of the battery is prolonged, the tab and the connecting sheet are not required to be bent in the axial direction, and the capacitance of the residual space can be improved.

In the description of this patent, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "front," "rear," "clockwise," "counterclockwise," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the patent.

In this patent, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in this patent will be understood by those of ordinary skill in the art as the case may be.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is to be limited to the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The battery shell comprises a cylindrical outer shell body (1), and is characterized in that the cylindrical outer shell body (1) is axially provided with a cavity (2), the cavity (2) is provided with a bottom (201), a peripheral side part (202) and an opening (203), a cover plate (3) is arranged at the opening (203) of the cavity (2), and two through grooves (4) penetrating through the peripheral side part (202) are formed in the peripheral side surface of the outer shell body (1).

2. The battery case according to claim 1, wherein: the two through grooves (4) are symmetrically arranged at 180 degrees on the peripheral side surface of the outer shell (1).

3. A secondary battery, characterized by comprising the battery case according to any one of claims 1 or 2, wherein the outer case (1) is inserted with a battery cell (5) insulated from the outer case (1) from an opening (203) of the cavity (2), the battery cell (5) has a positive tab (6) and a negative tab (7), and the two through grooves (4) respectively pass through a positive connection sheet (8) electrically connected with the positive tab (6) and a negative connection sheet (9) electrically connected with the negative tab (7).

4. The secondary battery according to claim 3, wherein: the battery cell (5) is formed by stacking a positive plate (10), a negative plate (11) and a diaphragm (12) positioned between the positive plate and the negative plate, and the leading-out ends of a positive lug (6) and a negative lug (7) of the battery cell (5) are led out from the peripheral side face of the battery cell (5) and are attached to the axial end face of the battery cell (5).

5. The secondary battery according to claim 4, wherein: the positive electrode lug (6) and the negative electrode lug (7) are both attached to the same axial end face of the battery cell (5).

6. The secondary battery according to claim 3, wherein: the edge of the through groove (4) is provided with a flange part (13), and the through groove (4) is internally and externally provided with a sealing layer (14) of a sealing connection sheet and an injection molding layer (15) for fixing the sealing layer (14) in sequence.

7. The secondary battery according to any one of claims 3 to 6, wherein: the anti-explosion battery pack is characterized in that a liquid injection hole (16) and an anti-explosion valve (17) are arranged on the cover plate (3), an insulating plate (18) is arranged between axial end faces corresponding to the cover plate (3) and the battery cell (5), an overflow hole (19) is arranged on the insulating plate (18) corresponding to the liquid injection hole (16), and an air permeable part (20) is arranged corresponding to the anti-explosion valve (17).

8. The secondary battery according to claim 7, wherein: the ventilation part (20) comprises a groove (2001) axially inwards recessed from the middle part of the insulating plate (18), and a net-shaped ventilation hole (2002) is formed in the bottom of the groove (2001).

9. The secondary battery according to claim 7, wherein: a cylindrical insulating shell (21) matched with the insulating plate (18) is further sleeved between the outer shell (1) and the battery cell (5), and a communication port (2101) is formed in the peripheral side face of the insulating shell (21) corresponding to the through groove (4).

10. The secondary battery according to claim 9, wherein: the bottom of the insulating shell (21) is provided with ventilation grooves (2102) distributed in a net shape.