CN217903264U

CN217903264U - Cylindrical battery shell and cylindrical battery

Info

Publication number: CN217903264U
Application number: CN202221796735.6U
Authority: CN
Inventors: 江泽珩
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2022-11-25
Anticipated expiration: 2032-07-11

Abstract

The utility model relates to the technical field of new energy batteries, in particular to a cylindrical battery shell and a cylindrical battery, wherein the cylindrical battery shell comprises a cylindrical shell, an anode end cover, a sealing insulating pad and a pole; the shell and the anode end cover are of an integral structure, and a through hole is formed in the circle center of the anode end cover; the sealing insulating pad comprises an insulating part, a raised sealing part is arranged at the circle center of the insulating part, the insulating part is arranged in the shell and is superposed with the positive end cover, and the sealing part penetrates through the through hole; in the utmost point post was equipped with the sealing, the outer wall extrusion sealing of utmost point post realizes the zonulae occludens of anodal end cover, sealed insulating pad and utmost point post. The technical scheme of the utility model effectively optimizes the process steps, shortens the process flow of the shell entering and welding of the electric core, reduces the equipment cost and promotes the equipment productivity; the detection of the sealing performance and the insulating performance of the battery shell is facilitated; after the battery core is arranged in the shell, the packaging and welding of the external shell of the anode are not needed, so that the production cost is reduced, and the production efficiency of products is improved.

Description

Cylindrical battery shell and cylindrical battery

Technical Field

The utility model relates to a new energy battery technical field especially relates to a cylinder battery housing and cylinder battery.

Background

The cylinder battery is split type tubular shell structure, when production encapsulation, needs to accomplish earlier utmost point post and electric core converge the welding of dish, then, needs put into utmost point post, insulating piece, solid fixed ring, sealing washer etc. respectively, will fix solid fixed ring and battery case welding together through laser at last.

The structure of the existing cylindrical battery shell is scattered, and mainly comprises an external shell, a top cover, a pole column, an insulating gasket, a fixing ring, a sealing ring and the like. During the equipment of cylinder battery, place insulating pad earlier on electric core, the utmost point ear of drawing electric core again passes the trompil on the insulating piece and is connected with anodal top cap, and anodal top cap, utmost point post and sealing washer etc. have carried out the integration and have connected, later treat that the battery annotates liquid and accomplish the back, accomplish the upsetting of anodal top cap can.

However, after the increase of the diameter of the cylindrical battery, the battery core adopts the full-lug design more, and under the existing solution, the installation precision of the insulating gasket can become difficult to control, and the high-rate charge and discharge requirements of the large cylindrical battery are higher, and the requirements on the internal sealing performance and the pressure resistance of the packaged battery are higher, so that the traditional top cover upsetting and sealing mode cannot meet the requirements and needs to adopt a welding mode. The increase of the diameter of the battery leads to the increase of the welding length and the reduction of the efficiency, when the anode and the cathode are required to be welded and sealed, the consistency of the welding quality is difficult to control, and finally the production efficiency of the product is too low.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem more than at least that exists among the prior art, the embodiment of the utility model provides a cylinder battery case and cylinder battery.

An embodiment of the utility model provides a cylindrical battery case on the one hand, including cylindric shell, positive pole end cover, sealed insulating pad and utmost point post; the shell and the positive end cover are of an integral structure, and a through hole is formed in the circle center of the positive end cover; the sealing insulating pad comprises an insulating part, a raised sealing part is arranged at the circle center of the insulating part, the insulating part is arranged in the shell and is superposed with the anode end cover, and the sealing part penetrates through the through hole; the utmost point post is located in the sealing, the outer wall extrusion of utmost point post the sealing realizes the anodal end cover sealed insulating pad reaches the zonulae occludens of utmost point post.

In some embodiments, one end of the sealing part is connected with the insulating part, and the second end passes through the through hole and is positioned outside the shell; the first end protrusion of utmost point post in the surface of insulating part, the second end of utmost point post with the second end of sealing portion flushes.

In some embodiments, the abutting surfaces of the shell and the insulating part and the inner wall of the through hole are respectively provided with a microporous structure for improving the connection strength.

In some embodiments, the insulating portion has the same shape as the positive end cap; the edge of the insulating part is attached to the inner wall of the shell.

In some embodiments, the insulating portion and the sealing portion are injection molded as a unitary structure.

In some embodiments, a positioning hole is formed on the end face of the second end of the pole.

In some embodiments, the insulating portion comprises a hollowed-out hole.

An embodiment of the utility model provides an on the other hand provides a cylindrical battery, including electric core and above-mentioned cylindrical battery shell structure.

In some embodiments, the positive electrode end of the cell is connected with a current collecting disc; the battery cell and the current collecting disc are arranged in the shell, and the pole is connected with the current collecting disc.

In some embodiments, the post and the current collecting disc are welded by resistance welding or laser welding.

The embodiment of the utility model provides a cylinder battery shell and cylinder battery, with anodal end cover, sealed insulating pad and utmost point post integration setting on the shell, need not use solid fixed ring, in the battery preparation process, the positive electrode extreme is owing to integrated, spare part is less, has consequently effectually optimized the process step, has shortened electric core income shell and welded process flow, reduces equipment cost, has promoted equipment productivity; the structural integrity of the shell is higher, so that the detection of the sealing property and the insulating property of the battery shell is facilitated; and after the battery core is placed into the shell, the packaging and welding of the external shell of the anode are not needed, so that the production cost is reduced, and the production efficiency of the product is improved.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:

in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

Fig. 1 is a cross-sectional view of a cylindrical battery case structure according to an embodiment of the present invention.

In the figure:

1: a housing; 2: a positive end cap; 3: sealing the insulating pad; 31: an insulating section; 32: a sealing part; 4: a pole column; 41: and (6) positioning the holes.

Detailed Description

To make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a cylindrical battery case, which includes a cylindrical case 1, a positive end cap 2, a sealing insulating pad 3, and a terminal post 4; the shell 1 and the anode end cover 2 are of an integral structure, and a through hole is formed in the center of the anode end cover 2; the sealing insulating pad 3 comprises an insulating part 31, a raised sealing part 32 is arranged at the circle center of the insulating part 31, the insulating part 31 is arranged in the shell 1 and is superposed with the positive end cover 2, and the sealing part 32 penetrates through the through hole; in the sealing portion 32 was located to utmost point post 4, the outer wall extrusion sealing portion 32 of utmost point post 4 realized anodal end cover 2, sealed insulating pad 3 and the zonulae occludens of utmost point post 4.

The embodiment of the utility model provides a cylinder battery case, at the positive terminal of shell 1, positive terminal cover 2 and 1 integrated into one piece of shell to reserve the through-hole on positive terminal cover 2, this through-hole is used for installing anodal utmost point post 4, utmost point post 4 is connected with the positive end plate through sealed insulating pad 3, also shell 1, positive terminal cover 2, sealed insulating pad 3 and utmost point post 4 form a body structure, this part need not to assemble the operation again in the manufacturing process of cylinder battery.

With continued reference to fig. 1, in some embodiments, the sealing portion 32 has one end connected to the insulating portion 31 and a second end located outside the housing 1 through the through hole; the first end of the pole 4 protrudes out of the surface of the insulating part 31, and the second end of the pole 4 is flush with the second end of the sealing part 32. The first end of the pole 4 is used for connecting the current collecting disc, for example, the first end of the pole 4 is welded with the current collecting disc, so that the first end of the pole 4 is arranged in a protruding mode, and welding operation of the pole 4 and the current collecting disc is facilitated.

For example, the insulating portion 31 and the sealing portion 32 are integrally formed by injection molding. The insulating part 31 and the sealing part 32 form an integrated structure and simultaneously meet the requirements of the insulating and sealing structure of the positive terminal, the two original structures are combined into one structure, the number of parts can be reduced, and the production process can be optimized; in addition, an integrated mechanism is adopted, so that the connection strength of the two is higher, the structural stability is better, and the sealing property and the insulating property are favorably ensured.

For example, the shape of the insulating portion 31 is the same as that of the positive electrode end cap 2; the edge of the insulating portion 31 is attached to the inner wall of the housing 1. The insulating part 31 can cover all the positive end covers 2, and can ensure that the positive end covers 2 are separated from the battery core and the current collecting disc, so that the isolation effect is better.

For example, the insulating portion 31 includes a hollow hole. The insulating portion 31 is provided to isolate the positive electrode end cap 2 from the current collector plate, and when the insulating portion 31 has a certain height, a certain number of holes may be provided in the insulating portion 31, and the holes do not cause conduction between the insulating portion 31 and the current collector plate. Through set up many fretwork holes on insulating part 31, can practice thrift the required material of insulating part 31, also conveniently carry out contactless welding operation to utmost point post 4.

With continued reference to fig. 1, in some embodiments, the facing surfaces of the housing 1 and the insulating portion 31 and the inner wall of the through hole are respectively provided with a micro-hole structure for improving the connection strength. The interface of the case 1 contacting the sealing insulating pad 3 is surface-treated to form a micro-porous structure, for example, a nano-pore, and the bonding strength of the case 1 and the sealing insulating pad 3 can be ensured by performing the surface treatment.

In some embodiments, the end surface of the second end of the pole 4 is provided with a positioning hole 41. The positioning hole 41 has a certain depth, and through setting up the positioning hole 41, in the production and manufacturing process of the cylindrical battery, the positioning device is matched with the positioning hole 41 so as to position the cylindrical battery shell, and the production and manufacturing accuracy and the working efficiency of the cylindrical battery can be improved.

The embodiment of the utility model provides a cylindrical battery, including electric core and above-mentioned cylindrical battery shell structure. The shell 1 comprises a positive end and a negative end, wherein the negative end of the shell 1 is an opening, in the production and manufacturing process of the battery, the battery cell is placed into the shell 1 through the opening of the negative end, and before the battery cell is placed into the shell, the lug is welded with the current collecting disc to form a battery cell structure with the current collecting disc.

Then, the cell structure is placed in a battery shell, and the current collecting disc is connected with the bottom end of the pole 4 through resistance welding or laser welding to complete the working procedures of shell entering and positive electrode welding of the cell structure. And all the assembly processes of the battery can be completed only by welding the negative current collecting plate and the cover plate. The whole shell and the electrode are simple and compact in structure, high in reliability and lower in processing cost.

By the process, the encapsulation process of the battery cell is effectively simplified. Due to the integrated design of the positive electrode, the connection process between the battery cell and the polar post 4 cover plate becomes simple and reliable, the requirement on welding technology is reduced, the traditional resistance welding or low-power laser welding can be completed, and the production cost is favorably reduced.

The embodiment of the utility model provides a pair of cylinder battery case and cylinder battery has following advantage:

1. the preparation of the integrated shell and the assembly process of the battery are completely independent, the traditional on-line scattered process steps are effectively reduced, the process flow of shell entering and welding of the battery cell is shortened, the equipment cost is reduced, and the equipment capacity is improved;

2. the number of electrode parts is reduced, a fixing ring is not needed, the insulating sheet and the sealing ring are designed in an integrated mode, and the insulating sheet, the sealing ring, the shell and the pole 4 are integrally formed in an injection molding mode, so that the connecting strength is higher, the structural stability is better, and the sealing performance and the insulating performance are favorably ensured;

3. the integrated shell has higher structural integrity, and is convenient for detecting the sealing property and the insulating property of the battery shell;

4. with the integrated shell design of the positive electrode, the electric core is not required to be subjected to encapsulation welding of the external shell of the positive electrode after entering the shell, so that the production cost is reduced, and the production efficiency of products is improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cylindrical battery shell is characterized by comprising a cylindrical shell (1), an anode end cover (2), a sealing insulating pad (3) and a pole (4);

the shell (1) and the anode end cover (2) are of an integral structure, and a through hole is formed in the center of the anode end cover (2);

the sealing insulating pad (3) comprises an insulating part (31), a raised sealing part (32) is arranged at the circle center of the insulating part (31), the insulating part (31) is arranged in the shell (1) and is superposed with the positive end cover (2), and the sealing part (32) penetrates through the through hole;

utmost point post (4) are located in sealing portion (32), the outer wall extrusion of utmost point post (4) sealing portion (32) are realized anodal end cover (2) sealed insulating pad (3) reach the zonulae occludens of utmost point post (4).

2. The cylindrical battery case according to claim 1, wherein the sealing part (32) has one end connected to the insulating part (31) and a second end located outside the case (1) through the through hole;

the first end protrusion of utmost point post (4) in the surface of insulating part (31), the second end of utmost point post (4) with the second end of sealing part (32) flushes.

3. The cylindrical battery shell as claimed in claim 1, wherein the binding surface of the shell (1) and the insulation part (31) and the inner wall of the through hole are respectively provided with a micro-porous structure for improving the connection strength.

4. The cylindrical battery case according to claim 1, wherein the shape of the insulating part (31) is the same as the shape of the positive end cap (2);

the edge of the insulating part (31) is attached to the inner wall of the shell (1).

5. The cylindrical battery housing as defined in claim 1, wherein the insulating portion (31) and the sealing portion (32) are an injection molded integral structure.

6. The cylindrical battery housing according to claim 1, wherein the terminal post (4) is provided with a positioning hole (41) on the end surface of the second end.

7. The cylindrical battery housing as claimed in claim 1, characterised in that the insulation (31) comprises a hollowed-out hole.

8. A cylindrical battery comprising a cell and the cylindrical battery case according to any one of claims 1 to 7.

9. The cylindrical battery of claim 8, wherein the positive electrode terminal of the cell is connected with a current collecting plate;

the battery core and the current collecting disc are arranged in the shell (1), and the pole (4) is connected with the current collecting disc.

10. The cylindrical battery according to claim 9, wherein the post (4) and the current collecting disc are welded by resistance welding or laser welding.