CN213716961U

CN213716961U - Button cell

Info

Publication number: CN213716961U
Application number: CN202022679275.6U
Authority: CN
Inventors: 凌万秾
Original assignee: Jiangmen Yuanxi Technology Co ltd
Current assignee: Jiangmen Yuanxi Technology Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-07-16
Anticipated expiration: 2030-11-18

Abstract

The utility model discloses a button cell, which comprises a shell, a pole, a sealing element and an electric core, wherein the shell is provided with a through hole; the pole column penetrates through the through hole, the pole column and the shell are connected in a sealing mode through the insulating part, the shell or the pole column is provided with a liquid injection hole, and the liquid injection hole is communicated with the inside of the shell; the sealing element is used for sealing the liquid injection hole; the electric core is arranged in the shell, a first lug and a second lug which are opposite in polarity are arranged at the two ends of the electric core respectively, the first lug is electrically connected with the shell, and the second lug is electrically connected with the pole. The utility model discloses simple structure, its casing self structure occupies that the space is little, and the inner space of casing is big, effectively improves the energy density of battery, satisfies the production demand.

Description

Button cell

Technical Field

The utility model belongs to the technical field of the lithium cell technique and specifically relates to a button cell is related to.

Background

The battery shell of the button battery adopts a cylindrical structure, the battery shell is generally divided into two structures at present, one structure comprises an inner shell, an outer shell and a sealing ring, the outer shell is reversely buckled at the outer side of the inner shell, the sealing ring is connected between the outer shell and the inner shell, the structure occupies more space in the radial direction, the battery cannot fully utilize the inner space of the battery shell, and the problem of low energy density of the battery exists; another kind of structure comprises shell and top cap, and the top cap is connected with the shell, and current top cap is generally connected with utmost point post through the riveting mode, and the structure is complicated, and the structural thickness of this kind of top cap is great, leads to occupying more space in the axial direction, has the lower problem of battery energy density equally.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a button cell, simple structure, its casing self structure occupies the space little, and the inner space of casing is big, effectively improves the energy density of battery, satisfies the production demand.

According to the utility model discloses button cell, include: a housing provided with a through hole; the pole column penetrates through the through hole, the pole column is connected with the shell in an adhesion mode through an insulating part, a liquid injection hole is formed in the shell or the pole column, and the liquid injection hole is communicated with the interior of the shell; the sealing element is used for sealing the liquid injection hole; the battery cell is arranged in the shell, a first tab and a second tab with opposite polarities are arranged at two ends of the battery cell respectively, the first tab is electrically connected with the shell, and the second tab is electrically connected with the pole.

The technical scheme at least has the following beneficial effects: only set up single-layer structure's casing on the radial direction, it is little to occupy the space, on the axial direction, utmost point post bonds on the casing through one deck insulating part, for prior art, the wall thickness at casing top is littleer, the space that occupies on the axial direction is littleer, therefore, the space that casing self structure occupied is little, under the prerequisite that the appearance size is the same, the inner space of this technical scheme's battery structure is bigger, effectively improve the energy density of battery, satisfy the production demand, simultaneously, it has the notes liquid hole to integrate, be convenient for pour into electrolyte into.

According to some embodiments of the utility model, utmost point post includes first section and second section, the cross-sectional area of first section is greater than the cross-sectional area of second section, just the cross-sectional area of first section is greater than the cross-sectional area of through-hole, first section passes through the insulating part bond in the inner wall of casing, the second section is worn to locate the through-hole.

According to some embodiments of the invention, the inner wall of the housing is provided with a groove for accommodating the first section.

According to some embodiments of the utility model, the casing includes shell and apron, the apron with shell sealing connection, electricity core install in the inside of shell, the through-hole sets up the apron perhaps the shell.

According to some embodiments of the present invention, the cover plate is provided with a positioning groove, and the other is mounted on the positioning groove.

According to some embodiments of the utility model, the tip of shell is provided with the flaring structure, the diameter of flaring structure with the diameter of apron matches, the flaring structure is promptly the constant head tank.

According to some embodiments of the utility model, the electric core orientation one side of first utmost point ear is provided with the first insulation layer.

According to some embodiments of the utility model, the electric core orientation one side of second utmost point ear is provided with the second insulating layer.

According to some embodiments of the present invention, the housing and the end surface of the insulating member contact are subjected to metal passivation or complexation, and the terminal and the end surface of the insulating member contact are subjected to metal passivation or complexation

According to some embodiments of the invention, the housing is a stainless steel part.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a cross-sectional view of a button cell in an embodiment of the present invention;

fig. 2 is a cross-sectional view of an electrode post in an embodiment of the present invention;

fig. 3 is a cross-sectional view of a cover plate according to another embodiment of the present invention;

fig. 4 is a cross-sectional view of a button cell battery according to another embodiment of the present invention;

fig. 5 is a cross-sectional view of a housing in another embodiment of the invention;

fig. 6 is a partial sectional view of the connection of the housing and the cover plate according to another embodiment of the present invention.

Reference numerals:

the shell comprises a shell body 100, a cover plate 110, a first through hole 111, a first groove 112, a stepped groove 113, a shell 120, a second through hole 121, a second groove 122 and a flaring structure 123;

the pole 200, the first section 210, the second section 220, the liquid injection hole 230 and the insulating part 240;

a sealing member 300;

the battery cell comprises a battery cell 400, a first tab 410, a second tab 420, a first insulating layer 430 and a second insulating layer 440.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 and 2, an embodiment of the present invention provides a button cell, including a casing 100, a terminal post 200, a sealing member 300, and a battery cell 400, where the casing 100 is composed of a casing 120 and a cover plate 110, the cover plate 110 is a circular plate, the cover plate 110 is hermetically connected to the casing 120 by welding, a first through hole 111 is formed in the middle of the cover plate 110, the terminal post 200 is inserted into the first through hole 111, specifically, the terminal post 200 is a cylindrical structure, the terminal post 200 includes a first section 210 and a second section 220, a cross-sectional area of the first section 210 is greater than a cross-sectional area of the second section 220, and a cross-sectional area of the first section 210 is greater than a cross-sectional area of the first through hole 111, that is, a diameter of the first section 210 is greater than a diameter of the second section 220, the first section 210 is adhered to an inner wall of the cover plate 110 by an insulating member 240, the second section 220 is inserted into the first through hole 111, and an electrical gap is, it can be understood that the electrical gap may also be filled with an insulating member 240 to further enhance the insulating effect between the terminal 200 and the cover plate 110, the terminal 200 is adhered to the cover plate 110 in a reversed state, so as to prevent the terminal 200 from separating from the cover plate 110, and enhance the stability and reliability of the structure; the insulating member 240 is made of polypropylene, polyethylene or other hot melt adhesive, and is bonded to the post 200 and the cover plate 110 in a heat sealing manner, so that on one hand, the post 200 is stably connected to the cover plate 110, and the sealing performance is good, thereby preventing the electrolyte from leaking, and on the other hand, the post 200 and the cover plate 110 have good insulation and short circuit prevention, and it can be understood that the insulating member 240 is not limited to the above materials, and only needs to have good adhesion, sealing performance and insulation performance; the battery cell 400 is installed inside the casing 120, a first tab 410 and a second tab 420 with opposite polarities are respectively arranged at two ends of the battery cell 400, specifically, the first tab 410 is a negative polarity, the second tab 420 is a positive polarity, the first tab 410 is welded on the bottom wall of the casing 120, the second tab 420 is welded on the pole 200, so that the first tab 410 is electrically connected with the casing 120, the second tab 420 is electrically connected with the pole 200, and the first tab 410 and the second tab 420 are respectively located at two ends of the casing 100 to avoid short circuit; the middle part of utmost point post 200 is provided with the notes liquid hole 230 that is used for annotating the electrolyte into electric core 400, annotates the inside of liquid hole 230 intercommunication casing 100, annotates the built-in sealing member 300 that is equipped with of liquid hole 230, and is concrete, and sealing member 300 is the steel ball, and the steel ball is interference fit with annotating liquid hole 230, and after pouring into electrolyte, the accessible steel ball seals annotates liquid hole 230, prevents that electrolyte from revealing, because annotate liquid hole 230 and set up in the intermediate position at battery top, the positioning assembly steel ball of being convenient for improves production efficiency. It is understood that the liquid injection hole 230 may be disposed on the bottom wall of the cover plate 110 or the housing 120, and only the electrolyte may be injected into the battery.

Compared with the prior art, the battery of the technical scheme only has the shell 120 with a single-layer structure in the radial direction, and occupies small space; in the axial direction, utmost point post 200 bonds on apron 110 through one deck insulating part 240, and the whole thickness of apron 110 is little, and the space that occupies on the axial direction is little, and consequently, the space that casing 100 self structure occupied is little, and under the prerequisite that the appearance size is the same, this technical scheme battery structure's usable inner space is bigger, effectively improves the energy density of battery, satisfies the production demand.

Further, the end face of the cover plate 110 contacting the insulating member 240 is subjected to metal passivation or complexation, and the end face of the pole 200 contacting the insulating member 240 is also subjected to metal passivation or complexation, so that good sealing performance between the cover plate 110 and the insulating member 240 and between the pole 200 and the insulating member 240 is ensured, and electrolyte leakage is avoided.

Further, the housing 120 and the cover plate 110 are preferably made of stainless steel, the housing 120 made of stainless steel can be formed by stamping, so that the processing is convenient, and the thickness can be 0.1mm to 0.2 mm. The aluminum shell needs to be 0.3mm, so that the strength of the shell 100 can be ensured, and the thickness of the stainless steel cover plate 110 can also be 0.1 mm-0.2 mm, so that the space occupied by the structure of the shell 100 can be further reduced, the internal space of the shell 100 is increased, and the energy density of the battery is effectively improved.

Referring to fig. 1, further, the tip of shell 120 is provided with the constant head tank, and the constant head tank is flaring structure 123, and the tip of shell 120 expands toward the outside promptly, makes the internal diameter of flaring structure 123 be greater than the internal diameter of shell 120, and flaring structure 123 passes through ARC structure with the inner wall of shell 120 and is connected, and the internal diameter of flaring structure 123 matches with the diameter of apron 110, and when installing apron 110, be convenient for pinpoint apron 110, convenient welding guarantees welding quality.

In other embodiments, referring to fig. 6, it can be understood that the circumferential edge of the cover plate 110 is provided with a stepped groove 113, the stepped groove 113 is annular, the inner diameter of the stepped groove 113 is matched with the inner diameter of the outer shell 120, the stepped groove 113 can accommodate the end edge of the outer shell 120, the stepped groove 113 is a positioning groove, and when the cover plate 110 is installed, the cover plate 110 can be accurately positioned, welding is facilitated, and welding quality is guaranteed.

Referring to fig. 1, further, the battery cell 400 is of a winding or stacking structure, the winding structure is adopted in the present technical solution, a first insulating layer 430 is disposed on one side of the battery cell 400 facing the first tab 410, and a second insulating layer 440 is disposed on one side of the battery cell 400 facing the second tab 420, because the positive plate and the negative plate of the battery cell 400 in the present technical solution extend from the upper end to the lower end of the battery cell 400, the first insulating layer 430 is disposed to avoid the problem of short circuit caused by the contact between the housing 120 and the negative plate, and the second insulating layer 440 is disposed to avoid the problem of short circuit caused by the contact between the tab 200 and the positive plate, so as to improve the safety performance of the battery, and the first insulating layer 430 and the second insulating layer 440 are insulating media such as polypropylene, polyethylene, polyester resin, and the like.

In other embodiments, referring to fig. 3, it can be understood that the inner wall of the cover plate 110 is provided with the first groove 112 for accommodating the first section 210 of the pole 200, so that the end surface of the first section 210 is flush with the inner wall of the cover plate 110, thereby further reducing the space occupied by the cover plate 110, increasing the internal space of the housing 100 and improving the energy density of the battery.

In other embodiments, referring to fig. 4 and 5, it can be understood that the difference from the previous embodiment is that the bottom wall of the housing 120 is provided with a second through hole 121 at the middle part, the pole 200 is arranged through the second through hole 121, namely, the first section 210 is adhered to the inner side of the bottom wall of the casing 120 through the insulating member 240, the second section 220 is inserted into the second through hole 121, the terminal 200 is adhered to the bottom wall of the casing 120 in a reversed-buckled state, the cover plate 110 is further connected to the top of the casing 120, that is, the installation position of the terminal 200 on the casing 100 is changed, the first tab 410 of the battery cell 400 is welded to the cover plate 110, the second tab 420 is welded to the terminal 200, so that the first tab 410 is electrically connected to the casing 120, and the second tab 420 is electrically connected to the terminal 200, the technical scheme also ensures that the self structure of the shell 100 occupies small space and the internal space of the shell 100 is large, thereby effectively improving the energy density of the battery and meeting the production requirement; it can be understood that the inner side of the bottom wall of the housing 120 is provided with the second groove 122 for accommodating the first section 210 of the pole post 200, so that the end surface of the first section 210 is flush with the inner side of the bottom wall of the housing 120, thereby further reducing the space occupied by the bottom wall of the housing 120, increasing the internal space of the housing 100 and improving the energy density of the battery.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. A button cell battery, comprising:

a housing provided with a through hole;

the pole column penetrates through the through hole, the pole column is connected with the shell in an adhesion mode through an insulating part, a liquid injection hole is formed in the shell or the pole column, and the liquid injection hole is communicated with the interior of the shell;

the sealing element is used for sealing the liquid injection hole;

the battery cell is arranged in the shell, a first tab and a second tab with opposite polarities are arranged at two ends of the battery cell respectively, the first tab is electrically connected with the shell, and the second tab is electrically connected with the pole.

2. A button cell according to claim 1, characterized in that: the pole comprises a first section and a second section, the cross-sectional area of the first section is larger than that of the through hole, the first section is adhered to the inner wall of the shell through the insulating piece, and the second section penetrates through the through hole.

3. A button cell according to claim 2, characterized in that: the inner wall of the housing is provided with a groove for accommodating the first section.

4. A button cell according to claim 1, characterized in that: the shell comprises a shell and a cover plate, the cover plate is connected with the shell in a sealing mode, the battery cell is arranged in the shell, and the through hole is formed in the cover plate or the shell.

5. The button cell according to claim 4, wherein: one of the shell and the cover plate is provided with a positioning groove, and the other is arranged in the positioning groove.

6. The button cell according to claim 5, wherein: the end part of the shell is provided with a flaring structure, the diameter of the flaring structure is matched with that of the cover plate, and the flaring structure is the positioning groove.

7. A button cell according to claim 1, characterized in that: one side of the battery cell, which faces the first tab, is provided with a first insulating layer.

8. A button cell according to claim 1, characterized in that: and a second insulating layer is arranged on one side of the battery cell, which faces the second tab.

9. A button cell according to claim 1, characterized in that: the end face of the shell, which is in contact with the insulating part, is subjected to metal passivation or complexing treatment, and the end face of the pole, which is in contact with the insulating part, is subjected to metal passivation or complexing treatment.

10. A button cell according to claim 1, characterized in that: the shell is made of stainless steel.