CN113013523A

CN113013523A - Button cell

Info

Publication number: CN113013523A
Application number: CN202110365799.4A
Authority: CN
Inventors: 刘黎明
Original assignee: Guangdong Hongjie New Energy Co ltd
Current assignee: Guangdong Hongjie New Energy Co ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-06-22

Abstract

The application relates to a button cell. This button cell includes: the shell comprises a positive shell and a negative shell, wherein the positive shell is connected to the negative shell in a matching way and defines an installation space together; the battery cell is arranged in the installation space and comprises a positive plate, a diaphragm piece and a negative plate, the positive plate is connected to the positive shell, and the negative plate is connected to the negative shell; the conductive terminal is connected to the battery cell; wherein, the casing is square. The button cell can be made into a size standard part, so that the automation of the packaging, packaging and assembling processes of the button cell is easy to realize, the processing consistency is effectively improved, and the processing yield of the button cell is ensured.

Description

Button cell

Technical Field

The application relates to the technical field of batteries, in particular to a button battery.

Background

In recent years, True Wireless bluetooth headsets (TWS) have been developed rapidly, and have been developed as a mobile phone accessory commonly used in daily life.

At present, the development direction of the real wireless bluetooth headset mainly focuses on prolonging the standby time and improving the tone quality effect. Because the real wireless Bluetooth headset usually selects the lithium ion button battery as a power supply, the importance of the lithium ion button battery on the extension of the standby time is self-evident to research.

Generally, the processing of the lithium ion button battery is generally manually completed, and the processing method has the problem of poor processing consistency.

Disclosure of Invention

Therefore, the button cell is needed to be provided aiming at the problem of poor processing consistency when the button cell is manually prepared and processed, so that the automation of the packaging, packaging and assembling processes of the button cell is easy to realize, and the processing consistency can be improved.

According to one aspect of the present application, a button cell is provided, which includes:

the shell comprises a positive shell and a negative shell, and the positive shell is matched with the negative shell and defines an installation space together;

the battery cell is arranged in the installation space and comprises a positive plate, a diaphragm piece and a negative plate, the positive plate is connected to the positive shell, the negative plate is connected to the negative shell, and the diaphragm piece is positioned between the positive plate and the negative plate; and

the conductive terminal is connected to the battery cell;

wherein, the casing is square.

In one embodiment, the positive electrode shell comprises a first mounting plate and a first cylinder, and the first mounting plate closes one end of the first cylinder, which is far away from the negative electrode shell; the negative electrode shell comprises a second mounting plate and a second cylinder, and the second mounting plate seals one end, far away from the positive electrode shell, of the second cylinder;

the first mounting panel reaches the second mounting panel is square board, first barrel reaches the second barrel is square section of thick bamboo.

In one embodiment, an end of the second cylinder facing away from the first mounting plate is configured to be capable of extending into the first cylinder to cooperate with the first cylinder to form the mounting space between the first cylinder, the second cylinder, the first mounting plate and the second mounting plate.

In one embodiment, the button cell further comprises an insulating sealing gasket, and the insulating sealing gasket is arranged between the first cylinder and the second cylinder along the radial direction of the first cylinder.

In one embodiment, the insulating sealing gasket is arranged on the second cylinder and can extend into the first cylinder together with the second cylinder.

In one embodiment, the insulating sealing gasket is sleeved on the wall of the second cylinder.

In one embodiment, the cell is formed by stacking and winding the positive electrode sheet, the separator and the negative electrode sheet; and/or

The battery core is formed by stacking and laminating the positive plate, the diaphragm piece and the negative plate.

In one embodiment, an outer shape of the battery cell is adapted to an inner shape of the installation space.

In one embodiment, the conductive terminals include a positive terminal and a negative terminal, the positive terminal is connected to the positive housing, and the negative terminal is connected to the negative housing.

In one embodiment, a protective adhesive is arranged at the joint of the positive terminal and the positive shell; and/or

And a protective adhesive is arranged at the joint of the negative terminal and the negative shell.

The shell of the button battery comprises a positive shell and a negative shell, the battery cell is arranged in an installation space defined by the positive shell and the negative shell, and the conductive terminal is connected with the battery cell. The shell formed by the positive shell and the negative shell is square, so that the button cell can be made into a size standard part, the automation of the packaging, packaging and assembling processes of the button cell is easy to realize, the processing consistency is effectively improved, and the processing yield of the button cell is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a button cell in an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of the button cell shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of another embodiment of the button cell shown in FIG. 1;

fig. 4 is a schematic position diagram of a conductive terminal of the button cell shown in fig. 1;

fig. 5 is a schematic position diagram of a conductive terminal in another embodiment of the button cell shown in fig. 1;

fig. 6 is a flow chart of the manufacturing process of the button cell shown in fig. 1.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

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 such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

In order to facilitate understanding of the technical solution of the present application, prior to the detailed description, an existing button cell will be described first.

The soft-package lithium ion button battery takes the aluminum-plastic film as a shell material, the aluminum-plastic film is a multilayer composite material, and polypropylene, aluminum foil and nylon are sequentially arranged from inside to outside, wherein the middle aluminum foil layer plays a role in sealing, and the polypropylene on the inner layer plays a role in hot melt sealing. The positive terminal and the negative terminal of the soft package lithium ion button battery are both formed by compounding a metal belt and a terminal adhesive, and the function of the terminal adhesive is the same as that of the inner polypropylene of the aluminum plastic film and is a hot melting sealing function.

Soft package lithium ion button cell mainly comprises soft package lithium ion cell, electron line and protection shield, because soft package lithium ion cell's size (thickness, width and height) is less usually, and the design size varies, and the specification and the interval difference of positive terminal and negative terminal are great, consequently, the assembly process (Pack) of soft package lithium ion cell, electron line and protection shield is usually accomplished with artifical manual. The soft-package lithium ion button battery manually assembled by manpower has the problem of poor processing consistency and cannot realize processing automation.

Based on this, the present application provides a button cell, which can preferably improve the above-mentioned problem.

The button cell of the present application will be described with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a button cell in an embodiment of the present application; FIG. 2 is a schematic cross-sectional view of the button cell shown in FIG. 1; FIG. 3 is a schematic cross-sectional view of another embodiment of the button cell shown in FIG. 1; fig. 4 is a schematic position diagram of a conductive terminal of the button cell shown in fig. 1; fig. 5 is a schematic position diagram of a conductive terminal in another embodiment of the button cell shown in fig. 1; fig. 6 is a flow chart of the manufacturing process of the button cell shown in fig. 1. For the purpose of illustration, only the structures described in connection with the present application are illustrated in the drawings.

The button battery 100 disclosed in at least one embodiment of the present application includes a casing 10, a battery cell 30, and a conductive terminal 50. The battery cell 30 is mounted in the housing 10, and the conductive terminal 50 is connected to the battery cell 30.

In some embodiments, the housing 10 includes a positive housing 11 and a negative housing 13, the positive housing 11 being coupled to the negative housing 13. Specifically, in some embodiments, the negative housing 13 is coupled to one side of the positive housing 11, and cooperates with the positive housing 11 to define a mounting space. Further, the installation space is used for installing the battery cell 30.

In some embodiments, the positive electrode case 11 and the negative electrode case 13 are both hollow structures with one open end and one closed end, and when the positive electrode case 11 and the negative electrode case 13 are coupled, they can cooperate with each other to form a hollow structure with two closed ends, so as to seal the case 10 and form an installation space.

Further, the positive housing 11 includes a first mounting plate 112 and a first cylinder 114, and the first mounting plate 112 encloses an end of the first cylinder 114 away from the negative housing 13. In some embodiments, the first mounting plate 112 and the first cylinder 114 may be integrally formed, and in other embodiments, the first mounting plate 112 and the first cylinder 114 may also be detachably connected.

The negative electrode case 13 includes a second mounting plate 132 and a second cylinder 134, and the second mounting plate 132 closes an end of the second cylinder 134 away from the positive electrode case 11. In some embodiments, the second mounting plate 132 and the second cylinder 134 can be integrally formed, and in other embodiments, the second mounting plate 132 and the second cylinder 134 can also be detachably connected.

Further, the first mounting plate 112 and the second mounting plate 132 are square plates. In some embodiments, the first mounting plate 112 and the second mounting plate 132 are the same size, and the orthographic projection of the first mounting plate 112 toward the second mounting plate 132 is completely located within the second mounting plate 132, i.e., the rims of the first mounting plate 112 and the second mounting plate 132 can completely overlap. In other embodiments, the first mounting plate 112 is smaller in size than the second mounting plate 132, and the orthographic projection of the first mounting plate 112 toward the second mounting plate 132 is entirely within the second mounting plate 132.

Further, the first cylinder 114 and the second cylinder 134 are square cylinders. In some embodiments, the end of the first cylinder 114 that just extends into the second cylinder 134 and faces away from the first mounting plate 112 can extend into the first cylinder 112 to cooperate with the first cylinder 112 to form a mounting space between the first cylinder, the second cylinder 134, the first mounting plate 112 and the second mounting plate 132. Specifically, the radial dimension of the first cylinder 114 is smaller than the radial dimension of the second cylinder 134, so that when the first cylinder 114 is coupled with the second cylinder 134, four frames of the first cylinder are completely located in four frames of the second cylinder 134, and two frames are parallel to each other. Meanwhile, when the installation space is viewed from the positive electrode case 11 toward the negative electrode case 13, the installation space is square.

In other embodiments, the radial dimension of the first cylinder 114 may be larger than the radial dimension of the second cylinder 134, so that when the second cylinder 134 is mated with the first cylinder 114, its four frames are completely located in the four frames of the first cylinder 114, and two frames are parallel to each other. In this way, the second cylinder 134 can just extend into the first cylinder 114 and abut against the first cylinder 114, and the second cylinder 134 can be configured to form an installation space in cooperation with the first cylinder 114, the first installation plate 112 and the second installation plate 132.

The first mounting plate 112 and the second mounting plate 132 are formed in a square shape having the same size, and the first cylinder 114 and the second cylinder 134 are formed in a square shape having a matching size, so that a projection of the housing 10 onto a horizontal plane is formed in a square shape. Therefore, the size of the button cell 100 can be standardized, so that the assembly automation of the button cell 100 is easy to realize, and the processing consistency of the button cell 100 is ensured.

In some embodiments, the positive electrode case 11 and the negative electrode case 13 are both made of a stainless steel metal material.

In some embodiments, the thickness of both the positive housing 11 and the negative housing 13 is less than 0.20 mm. It is understood that in other embodiments, the thicknesses of the positive electrode case 11 and the negative electrode case 13 may be adjusted according to the production requirements and the actual conditions.

In some embodiments, the joint of the positive electrode case 11 and the negative electrode case 13 can be mechanically sealed by a clamp, so as to prevent the organic solvent or electrolyte in the button cell 100 from leaking out.

It can be understood that, since the positive casing 11 and the negative casing 13 are both made of stainless steel metal material, in order to ensure that the organic solvent or the electrolyte in the button cell 100 does not leak, the machining precision of the positive casing 11 and the negative casing 13 needs to be strictly ensured, thereby raising the cost.

Therefore, in some embodiments, the button cell 100 further includes an insulating gasket 70, and the insulating gasket 70 is disposed between the first cylinder 114 and the second cylinder 134 along the radial direction of the first cylinder 114. The insulating gasket 70 can fill up a small gap between the first cylindrical member 114 and the second cylindrical member 134 in the radial direction of the first cylindrical member 114 when the negative electrode case 13 and the positive electrode case 11 are mechanically sealed. In this way, the airtightness of the housing 10 is ensured and the production costs of the button cell 100 are reduced. Meanwhile, the short circuit phenomenon between the positive electrode case 11 and the negative electrode case 13 can be prevented.

Further, the insulating gasket 70 is coupled to the second cylinder 134 and can extend into the first cylinder 114 along with the second cylinder 134 to fill up a small gap between the first cylinder 114 and the second cylinder 134.

Further, the insulating gasket 70 is sleeved on the wall of the second cylinder 134. In particular, in some embodiments, the insulating gasket 70 is shaped to fit the second cylinder 134 and can be wrapped around the wall of the second cylinder 134. In this way, the airtightness of the case 10 can be effectively ensured, and a short circuit between the positive electrode case 11 and the negative electrode case 13 can be prevented.

It will be readily appreciated that the insulating gasket 70 can also be coupled to the first cylinder 114.

In some embodiments, the battery cell 30 disposed in the installation space includes a positive electrode tab 32, a separator 34, and a negative electrode tab 36, wherein the positive electrode tab 32 is connected to the positive electrode case 11, and the negative electrode tab 36 is connected to the negative electrode case 13.

In some embodiments, a current collecting net is partially or completely laid on the back side of the negative electrode sheet 36, a current collecting sheet is arranged on the opposite side of the positive electrode case 11 and the negative electrode case 13, and the material of the current collecting sheet is the same as that of the positive electrode case 11 and is welded on the opposite side of the positive electrode case 11 and the negative electrode case 13. Further, after the battery cell 30 is placed in the installation space, a negative electrode sheet 36 with a current collecting net is arranged on the side close to the negative electrode casing 13, and a positive electrode sheet 32 is arranged on the side close to the positive electrode casing 11. The negative electrode sheet 36 is connected to the negative electrode case 13 through a current collecting net, and the positive electrode sheet 32 is connected to the positive electrode case 11 through a current collecting sheet.

Specifically, in some embodiments, the battery cell 30 is formed by a positive electrode sheet 32, a separator 34, and a negative electrode sheet 36 in a stacked winding configuration. The winding structure of the battery core 30 can make full use of the internal space of the button battery 100, so that the energy density of the button battery 100 is improved. In the present embodiment, the energy density of the button cell 100 reaches 350WH/L or more. Meanwhile, the diaphragm 34 is used for ensuring the safe and stable operation of the button cell 100; the separator member 34 has an electrical insulating property for ensuring mechanical isolation between the positive electrode tab 32 and the negative electrode tab 36; further, the separator 34 is disposed between the positive electrode sheet 32 and the negative electrode sheet 36, and wound together with the positive electrode sheet 32 and the negative electrode sheet 36 into the battery cell 30.

In other embodiments, the battery cell 30 may also be formed by a stacked lamination of the positive electrode tab 32, the separator 34, and the negative electrode tab 36. In this way, the internal space of the button cell 100 can be fully utilized, thereby increasing the energy density of the button cell 100.

In particular to some embodiments, the separator member 34 is a battery separator film, and the separator member 34 is a PP material in this embodiment. In other embodiments, the diaphragm member 34 may also be a PE material or the like.

In some embodiments, the battery cell 30 is further provided with an insulating film, which has a temperature-resistant and corrosion-resistant function. Further, this insulating film cladding is in the electric core 30 outside to fastening electric core 30, thereby when making the insulating film play insulating effect, can also prevent that positive plate 32 or negative pole piece 36 in electric core 30 from taking place skew or not hard up phenomenon. The battery cell 30 is further provided at one side end thereof with a liquid injection hole (not shown) for injecting an electrolyte or an organic solution. Further, the liquid injection hole should be close to the joint between the positive electrode case 11 and the negative electrode case 13, so as to facilitate and effectively perform the liquid injection operation. Further, a pour hole is provided in the insulating film of the battery cell 30.

In some embodiments, the outer shape of the battery cell 30 is adapted to the inner shape of the installation space. Thus, the internal space of the button cell 100 can be fully utilized, and the energy density of the button cell 100 is improved.

In some embodiments, the conductive terminal 50 is connected to the battery cell 30. The conductive terminal 50 includes a positive terminal 51 and a negative terminal 53, and the positive terminal 51 and the negative terminal 53 may be respectively connected to two opposite sides of the battery cell 30, or may be connected to the same side of the battery cell 30. The conductive terminals 50 are arranged in a strip shape and can be folded.

In some embodiments, the positive terminal 51 is connected to the positive housing 11, and the positive housing 11 is connected to the positive plate 32, so that the positive terminal 51 can communicate with the positive plate 32; the negative terminal 53 is connected to the negative electrode case 13, and the negative electrode case 13 is connected to the negative electrode tab 36 so that the negative terminal 53 can communicate with the negative electrode tab 36.

Further, the positive electrode terminal 51 and the negative electrode terminal 53 are connected to the positive electrode case 11 and the negative electrode case 13, respectively, by welding. In some embodiments, the welding method may be resistance welding, ultrasonic welding, or laser welding, and the application is not limited in this respect.

Further, when the positive electrode terminal 51 and the negative electrode terminal 53 are welded to the positive electrode case 11 and the negative electrode case 13, respectively, unevenness is liable to occur at the joint. In order to prevent this, a protective adhesive may be provided at the welded joint between the positive electrode terminal 51 and the positive electrode case 11, at the welded joint between the negative electrode terminal 53 and the negative electrode case 13, or at the welded joint between the positive electrode terminal 51 and the positive electrode case 11, and at the welded joint between the negative electrode terminal 53 and the negative electrode case 13. Specifically, the protective adhesive may be a temperature resistant adhesive. More specifically, the protective adhesive may be acrylic high temperature adhesive paper.

The lengths of the positive terminal 51 and the negative terminal 53 may be determined according to actual production requirements. Specifically, in some embodiments, the length of the positive terminal 51 may be greater than the length of the negative terminal 53, the length of the positive terminal 51 may be less than the length of the negative terminal 53, and the length of the positive terminal 51 may be equal to the length of the negative terminal 53.

In some embodiments, the positive terminal 51 may be made of aluminum foil or aluminum strip material; the negative terminal 53 may be made of copper foil, nickel tape, or copper nickel tape material.

In order to intuitively describe the structural composition of the battery cell 30 in detail, the positive electrode sheet 32, the separator 34, and the negative electrode sheet 36 of the battery cell 30 are sequentially stacked and distributed. In an actual production process, the positive electrode tab 32 is connected to one side of the separator 34, and the negative electrode tab 36 is connected to the other side of the separator 34, and the square battery cell 30 is formed by winding or stacking the sheets in a stacked manner. The insulating film is connected to the diaphragm member 34 at the outermost periphery of the battery cell 30, thereby achieving the position limitation and the insulating treatment.

In some embodiments, the button cell 100 may be a lithium ion button cell.

Meanwhile, a manufacturing method for the button cell 100 is also provided, which comprises the following steps:

s910: a positive electrode tab 32, a separator 34, and a negative electrode tab 36 are provided.

S920: the positive electrode sheet 32, the separator 34, and the negative electrode sheet 36 are wound or laminated to form a square battery cell 30.

S930: a case 10 is provided, the case 10 includes a positive case 11 and a negative case 13, and a square mounting space is formed in the middle section of the positive case 11 and the negative case 13.

S940: a conductive terminal 50 is provided, the conductive terminal 50 includes a positive terminal 51 and a negative terminal 53.

S950: the positive electrode terminal 51 is welded to the positive electrode case 11, and the negative electrode terminal 53 is welded to the negative electrode case 13.

S960: the battery cell 30 is provided with a liquid injection hole.

S970: the battery cell 30 is placed in an installation space formed by the positive electrode case 11 and the negative electrode case 13, and an electrolyte or an organic solution is injected into an injection hole formed in the battery cell 30.

S980: the positive electrode case 11 and the negative electrode case 13 are mechanically sealed by a jig.

In the button battery 100, the casing 10 includes the positive casing 11 and the negative casing 13, the battery cell 30 is disposed in the installation space defined by the positive casing 11 and the negative casing 13, and the conductive terminal 50 is connected to the battery cell 30. The shell 10 formed by the positive shell 11 and the negative shell 13 is square, so that the button cell 100 can be made into a size standard part, the automation of the packaging, packaging and assembling processes of the button cell 100 is easy to realize, the processing consistency is effectively improved, and the processing yield of the button cell 100 is ensured.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A button cell, comprising:

the conductive terminal is connected to the battery cell;

wherein, the casing is square.

2. The button cell according to claim 1, wherein the positive housing includes a first mounting plate and a first cylinder, the first mounting plate closing an end of the first cylinder away from the negative housing; the negative electrode shell comprises a second mounting plate and a second cylinder, and the second mounting plate seals one end, far away from the positive electrode shell, of the second cylinder;

3. The button cell according to claim 2, wherein an end of the second cylinder facing away from the first mounting plate is configured to be able to protrude into the first cylinder to cooperate with the first cylinder to form the mounting space between the first cylinder, the second cylinder, the first mounting plate, and the second mounting plate.

4. The button cell according to claim 3, further comprising an insulating gasket disposed between the first cylinder and the second cylinder in a radial direction of the first cylinder.

5. The button cell according to claim 4, wherein the insulating seal is disposed on the second cylinder and can extend into the first cylinder together with the second cylinder.

6. The button cell according to claim 5, wherein the insulating gasket is sleeved on the wall of the second cylinder.

7. The button battery according to claim 1, wherein the cell is formed by a stacked winding structure of the positive electrode sheet, the separator and the negative electrode sheet; and/or

8. The button cell according to claim 1, wherein the outer contour of the cell is adapted to the inner contour of the installation space.

9. The button cell of claim 1, wherein the conductive terminal comprises a positive terminal and a negative terminal, the positive terminal is connected to the positive housing, and the negative terminal is connected to the negative housing.

10. The button cell according to claim 8, wherein a protective adhesive is provided at the junction of the positive terminal and the positive case; and/or