CN217485674U

CN217485674U - Cylindrical battery

Info

Publication number: CN217485674U
Application number: CN202221353247.8U
Authority: CN
Inventors: 单雪燕
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-09-23
Anticipated expiration: 2032-05-31

Abstract

The utility model belongs to the technical field of the battery, a cylinder battery is disclosed, including the casing, roll up core and anodal utmost point post. The winding core is arranged in the shell, one end of the winding core is provided with a positive electrode lug and a negative electrode lug, and the negative electrode lug is electrically connected with the shell. The positive pole column is arranged at one end of the shell close to the positive pole lug and penetrates through the shell to be electrically connected with the positive pole lug. The utility model discloses a cylindrical battery through set up anodal ear and negative pole ear in the same one side of rolling up the core, and the negative pole ear of being convenient for is connected with the casing electricity, and anodal ear is connected with anodal utmost point post electricity, makes the positive negative pole homonymy of cylindrical battery. And the same-side kneading and flattening can be carried out on the positive electrode lug and the negative electrode lug in the production process of the cylindrical battery, so that the production efficiency is improved. Compare positive pole ear and negative pole ear and be located the mode that sets up that rolls up a core both ends respectively, the utility model discloses a cylinder battery has effectively reduced the length that rolls up the core, can improve the capacity of cylinder battery under the unchangeable condition of cylinder battery structure size.

Description

Cylindrical battery

Technical Field

The utility model relates to a battery technology field especially relates to a cylinder battery.

Background

The cylindrical battery is one of important product forms of a new energy power battery, and has a large number of applications in new energy automobiles due to high energy density and low manufacturing cost. With the increasing demand of energy density after the power batteries are grouped, the demand of assembling the power battery module to the same side of the positive electrode and the negative electrode of the batteries is increased gradually. The prior cylindrical battery structure is difficult to realize the same side of the positive and negative sides of the battery,

therefore, a cylindrical battery is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cylinder battery makes the positive negative pole of cylinder battery be located the same end of cylinder battery, is favorable to improving production efficiency, can improve the capacity of cylinder battery under the unchangeable condition of cylinder battery structure size.

To achieve the purpose, the utility model adopts the following technical proposal:

a cylindrical battery comprising:

a housing;

the winding core is arranged in the shell, one end of the winding core is provided with a positive electrode lug and a negative electrode lug, and the negative electrode lug is electrically connected with the shell;

and the positive pole column is arranged at one end, close to the positive pole lug, of the shell, and penetrates through the shell to be electrically connected with the positive pole lug.

Preferably, the winding core comprises a positive plate, a negative plate and a diaphragm, the diaphragm is clamped between the positive plate and the negative plate, and one end of the diaphragm, which is far away from the positive pole post, is exposed out of the positive plate and the negative plate.

Preferably, the lithium battery further comprises a negative electrode adapter plate, one end of the negative electrode adapter plate is abutted with the negative electrode lug, and the other end of the negative electrode adapter plate is abutted with the shell.

Preferably, the negative electrode interposer includes:

a first connection portion attached to the negative electrode tab;

the second connecting part is attached to the inner wall of the shell;

and one end of the supporting part is fixedly connected with the first connecting part, and the other end of the supporting part is fixedly connected with the second connecting part.

Preferably, the first connection portion is welded to the negative tab, and the second connection portion is welded to the case.

Preferably, the lithium battery further comprises a positive pole adapter plate, one end of the positive pole adapter plate is attached to and welded with the positive pole lug, and the other end of the positive pole adapter plate is attached to and welded with one end face of the positive pole extending into the shell.

Preferably, a mounting hole is formed in the end face of one end, close to the positive electrode lug, of the shell, and the positive electrode pole penetrates through the mounting hole and is riveted to the shell.

Preferably, the lithium ion battery further comprises a sealing ring sleeved on the positive pole column, and the sealing ring is clamped between the positive pole column and the shell to seal a gap between the positive pole column and the shell.

Preferably, the lithium ion battery further comprises an insulation limiting component sleeved on the positive pole, and the insulation limiting component enables the positive pole to be arranged at intervals with the shell.

Preferably, the insulation limiting component comprises:

the upper insulation limiting part is sleeved on the positive pole and comprises a first insulation limiting part and a second insulation limiting part fixedly connected with the first insulation limiting part, the first insulation limiting part is clamped between the positive pole and the inner wall of the shell, and the second insulation limiting part extends into the mounting hole;

and the lower insulation limiting part is sleeved on the positive pole, and the lower insulation limiting part is clamped between the positive pole and the outer wall of the shell.

The utility model has the advantages that:

the utility model discloses a cylindrical battery through set up anodal ear and negative pole ear in the same one side of rolling up the core, and the negative pole ear of being convenient for is connected with the casing electricity, and anodal ear is connected with anodal utmost point post electricity, makes the positive negative pole homonymy of cylindrical battery. And the same-side kneading and flattening can be carried out on the positive electrode lug and the negative electrode lug in the production process of the cylindrical battery, so that the production efficiency is improved. Compare anodal ear and negative pole ear and be located the mode that sets up that rolls up a core both ends respectively, the utility model provides a cylinder battery has effectively reduced the length that rolls up a core, can improve the capacity of cylinder battery under the unchangeable condition of cylinder battery structure size.

Drawings

Fig. 1 is a cross-sectional view of a cylindrical battery provided by an embodiment of the present invention;

fig. 2 is a schematic diagram of a positive plate after positive tab is cut in a sectional manner in a production process of a cylindrical battery provided by an embodiment of the present invention;

fig. 3 is a schematic diagram of a negative electrode tab cut in a sectional manner in a production process of a cylindrical battery according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a cylindrical battery provided by an embodiment of the present invention after a positive plate and a negative plate are attached to a diaphragm in a production process;

fig. 5 is a schematic view of a winding core when the positive electrode tab and the negative electrode tab are not kneaded in the production process of the cylindrical battery provided by the embodiment of the present invention;

fig. 6 is a schematic view of a roll core after a positive electrode tab and a negative electrode tab are flattened in the production process of a cylindrical battery provided by the embodiment of the present invention;

fig. 7 is a schematic diagram of a negative electrode adapter sheet and a positive electrode adapter sheet welded on a winding core in a cylindrical battery production process provided by the embodiment of the present invention;

fig. 8 is a schematic structural diagram of the cylindrical battery provided by the embodiment of the present invention after the winding core is placed in the casing 1.

In the figure:

1. a housing;

2. a winding core; 21. a positive tab; 22. a negative tab; 23. a positive plate; 24. a negative plate; 25. a diaphragm;

3. a positive pole column;

4. a negative pole switching piece; 41. a first connection portion; 42. a second connecting portion; 43. a support portion;

5. a positive electrode patch;

6. a seal ring;

7. an insulating limit component;

71. an upper insulation limit part; 711. a first insulation limiting part; 712. a second insulation limiting part;

72. and a lower insulation limit member.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

As shown in fig. 1, the present embodiment provides a cylindrical battery including a case 1, a jelly roll 2, and a positive electrode tab 3. The winding core 2 is arranged in the shell 1, one end of the winding core 2 is provided with a positive electrode tab 21 and a negative electrode tab 22, and the negative electrode tab 22 is electrically connected with the shell 1. The positive pole post 3 is arranged at one end of the casing 1 close to the positive pole lug 21, and the positive pole post 3 penetrates through the casing 1 to be electrically connected with the positive pole lug 21.

The cylindrical battery provided by the embodiment is convenient for the negative electrode tab 22 to be electrically connected with the shell 1 by arranging the positive electrode tab 21 and the negative electrode tab 22 on the same side of the winding core 2, and the positive electrode tab 21 is electrically connected with the positive electrode post 3 to enable the positive electrode and the negative electrode of the cylindrical battery to be on the same side. And the same-side kneading and flattening can be carried out on the positive electrode tab 21 and the negative electrode tab 22 in the production process of the cylindrical battery, which is beneficial to improving the production efficiency. Compare positive pole ear 21 and negative pole ear 22 and be located the mode that sets up that rolls up core 2 both ends respectively, the cylinder battery that this embodiment provided has effectively reduced the length of rolling up core 2, can improve the capacity of cylinder battery under the unchangeable condition of cylinder battery structure size.

Optionally, as shown in fig. 1, the winding core 2 includes a positive plate 23, a negative plate 24 and a diaphragm 25, the diaphragm 25 is sandwiched between the positive plate 23 and the negative plate 24, and one end of the diaphragm 25, which is far away from the positive electrode post 3, is exposed out of the positive plate 23 and the negative plate 24, so that part of the diaphragm 25 is directly contacted with the electrolyte, thereby facilitating rapid liquid absorption, improving wettability of the electrolyte, and improving production efficiency of the cylindrical battery core and cycle performance in a later period.

Optionally, as shown in fig. 1, the cylindrical battery provided in this embodiment further includes a negative electrode adaptor sheet 4, one end of the negative electrode adaptor sheet 4 abuts against the negative electrode tab 22, and the other end of the negative electrode adaptor sheet 4 abuts against the casing 1, so that the casing 1 and the negative electrode tab 22 are electrically connected through the negative electrode adaptor sheet 4.

Alternatively, as shown in fig. 1, the negative electrode interposer 4 includes a first connection portion 41, a second connection portion 42, and a support portion 43. The first connection portion 41 is attached to the negative electrode tab 22. The second connecting portion 42 is attached to the inner wall of the housing 1. The supporting portion 43 has one end connected to the first connecting portion 41 and the other end connected to the second connecting portion 42. The first connecting part 41 is attached to the negative tab 22, and the second connecting part 42 is attached to the inner wall of the casing 1, so that the negative adapter plate 4 has good overcurrent capacity. Specifically, in this embodiment, the negative electrode interposer 4 is a zigzag elastic sheet, and after the negative electrode interposer 4 is sandwiched between the negative electrode tab 22 and the casing 1, the elastic force of the negative electrode interposer 4 can drive the first connection portion 41 to be attached to the negative electrode tab 22, and the second connection portion 42 to be attached to the inner wall of the casing 1.

Alternatively, the first connection portion 41 is welded to the negative tab 22 by laser welding or ultrasonic welding, preferably, in this embodiment, the first connection portion 41 is welded to the negative tab 22 by laser welding, and the second connection portion 42 is welded to the case 1, and in this embodiment, the second connection portion 42 is welded to the case 1 by laser penetration welding. The first connecting portion 41 is welded to the negative electrode tab 22, and the second connecting portion 42 is welded to the case 1, so that the overcurrent capacity of the negative electrode tab 22 and the case 1 can be improved.

Optionally, as shown in fig. 1, the cylindrical battery provided in this embodiment further includes a positive electrode adapter sheet 5, one end of the positive electrode adapter sheet 5 is attached to and welded to the positive electrode tab 21, the other end of the positive electrode adapter sheet is attached to and welded to an end surface of the positive electrode terminal 3 extending into the casing 1, and the positive electrode tab 21 is electrically connected to the positive electrode terminal 3 through the positive electrode adapter sheet 5. Laser welding or ultrasonic welding can be selected between the positive electrode adapter plate 5 and the positive electrode tab 21, and in the embodiment, laser welding is selected. The positive pole adapter sheet 5 and the positive pole post 3 can be welded by ultrasonic welding, resistance welding or laser penetration welding, and in the embodiment, resistance welding is adopted.

Optionally, as shown in fig. 1, an end surface of the casing 1 near one end of the positive tab 21 is provided with a mounting hole, and the positive electrode post 3 is riveted on the casing 1 through the mounting hole. The end of the positive pole 3 extending into the casing is upset in a riveting mode, so that the positive pole 3 is riveted on the casing 1.

Optionally, as shown in fig. 1, the cylindrical battery provided in this embodiment further includes a sealing ring 6 sleeved on the positive electrode post 3, and the sealing ring 6 is clamped between the positive electrode post 3 and the casing 1 to seal a gap between the positive electrode post 3 and the casing 1, so as to prevent the electrolyte in the casing 1 from leaking.

Optionally, as shown in fig. 1, the cylindrical battery provided in this embodiment further includes an insulating limiting component 7 sleeved on the positive electrode post 3, and the insulating limiting component 7 enables the positive electrode post 3 and the housing 1 to be spaced apart from each other, so as to avoid short circuit caused by contact between the positive electrode post 3 and the housing 1.

Optionally, as shown in fig. 1, the insulation limit assembly 7 includes an upper insulation limit member 71 and a lower insulation limit member 72. The upper insulation limiting member 71 is sleeved on the positive electrode post 3, the upper insulation limiting member 71 includes a first insulation limiting portion 711 and a second insulation limiting portion 712 fixedly connected with the first insulation limiting portion 711, the first insulation limiting portion 711 is clamped between the positive electrode post 3 and the inner wall of the housing 1, and the second insulation limiting portion 712 extends into the mounting hole. The lower insulation limiting member 72 is sleeved on the anode post 3, and the lower insulation limiting member 72 is clamped between the anode post 3 and the outer wall of the housing 1. Specifically, in the present embodiment, the upper insulation limiting member 71 and the lower insulation limiting member 72 are made of plastic material.

Optionally, as shown in fig. 1, a first insulation limiting part 711 extends between positive tab 21 and the inner wall of case 1 to separate positive tab 21 from case 1, so as to avoid short circuit caused by contact between positive tab 21 and case 1.

Alternatively, as shown in fig. 1, the sealing ring 6 is interposed between the positive electrode post 3 and the outer wall of the housing 1, and the lower insulating limiting member 72 surrounds the outer side of the sealing ring 6.

During the production of the cylindrical battery, as shown in fig. 2 and 3, after the coating and rolling of the positive plate 23 and the negative plate 24 are completed, the positive tab 21 and the negative tab 22 are respectively cut in a sectional manner through an archimedean spiral equation and finite element simulation calculation, as shown in fig. 4, then the positive plate 23 and the negative plate 24 are attached to two sides of the diaphragm 25, as shown in fig. 5, a winding core 2 is formed by winding, after the winding is completed, the positive tab 21 and the negative tab 22 are positioned at the same end of the winding core 2 and are respectively positioned at two sides of the axis of the winding core, the central area of the end face of the end of the winding core 2 is a diaphragm area, the diaphragm area has no positive tab 21 and no negative tab 22, as shown in fig. 6, and then the positive tab 21 and the negative tab 22 are rubbed or mechanically pressed, so that the positive tab 21 and the negative tab 22 are rubbed and flattened on the same side, and the production efficiency is improved. As shown in fig. 7, weld positive pole switching piece 5 on positive pole ear 21 crumples the flat district, weld negative pole switching piece 4 on negative pole ear 22 crumples the flat district, as shown in fig. 8, then put roll core 2 into the casing 1 that has riveted with anodal utmost point post 3 through the opening of casing 1, weld negative pole switching piece 4 and casing 1, positive pole switching piece 5 and anodal utmost point post 3 weld, negative pole switching piece 4 is located the same one end of casing 1 with anodal switching piece 5, be favorable to welding efficiency. As shown in fig. 1, finally, electrolyte is injected, and the casing 1 is sealed by the cover plate in cooperation with the laser welding industry or the rolling groove industry, so as to obtain a cylindrical battery cell.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements, and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A cylindrical battery, comprising:

a housing (1);

the winding core (2) is arranged in the shell (1), one end of the winding core (2) is provided with a positive electrode lug (21) and a negative electrode lug (22), and the negative electrode lug (22) is electrically connected with the shell (1);

the positive pole post (3) is arranged at one end, close to the positive pole lug (21), of the shell (1), and the positive pole post (3) penetrates through the shell (1) to be electrically connected with the positive pole lug (21).

2. The cylindrical battery according to claim 1, wherein the winding core (2) comprises a positive plate (23), a negative plate (24) and a diaphragm (25), the diaphragm (25) is clamped between the positive plate (23) and the negative plate (24), and one end of the diaphragm (25) far away from the positive pole post (3) is exposed out of the positive plate (23) and the negative plate (24).

3. The cylindrical battery according to claim 1, further comprising a negative electrode adaptor (4), wherein one end of the negative electrode adaptor (4) abuts against the negative electrode tab (22), and the other end abuts against the casing (1).

4. Cylindrical battery according to claim 3, characterized in that the negative electrode adaptor sheet (4) comprises:

a first connection part (41) bonded to the negative electrode tab (22);

a second connecting part (42) which is attached to the inner wall of the housing (1);

and a support portion (43) having one end connected to the first connection portion (41) and the other end connected to the second connection portion (42).

5. Cylindrical battery according to claim 4, characterized in that the first connection (41) is welded to the negative tab (22) and the second connection (42) is welded to the case (1).

6. The cylindrical battery according to claim 1 further comprises a positive pole adapter sheet (5), one end of the positive pole adapter sheet (5) is attached to and welded with the positive pole lug (21), and the other end of the positive pole adapter sheet is attached to and welded with the end face of one end, extending into the shell (1), of the positive pole post (3).

7. The cylindrical battery as claimed in claim 1, wherein the end face of the casing (1) close to one end of the positive electrode tab (21) is provided with a mounting hole, and the positive electrode post (3) is riveted on the casing (1) through the mounting hole.

8. The cylindrical battery according to claim 7 further comprises a sealing ring (6) sleeved on the positive electrode post (3), wherein the sealing ring (6) is clamped between the positive electrode post (3) and the casing (1) to seal a gap between the positive electrode post (3) and the casing (1).

9. The cylindrical battery according to claim 8 further comprises an insulation limiting component (7) sleeved on the positive pole post (3), wherein the insulation limiting component (7) enables the positive pole post (3) and the shell (1) to be arranged at intervals.

10. Cylindrical battery according to claim 9, characterized in that the insulation limit assembly (7) comprises:

the upper insulation limiting part (71) is sleeved on the positive pole column (3), the upper insulation limiting part (71) comprises a first insulation limiting part (711) and a second insulation limiting part (712) fixedly connected with the first insulation limiting part (711), the first insulation limiting part (711) is clamped between the positive pole column (3) and the inner wall of the shell (1), and the second insulation limiting part (712) extends into the mounting hole;

and the lower insulation limiting part (72) is sleeved on the anode pole (3), and the lower insulation limiting part (72) is clamped between the anode pole (3) and the outer wall of the shell (1).