High-capacity miniature button cell structure

Abstract

The utility model relates to the technical field of button cell preparation, in particular to a high-capacity miniature button cell structure, which comprises a positive pole shell and a negative pole shell fixedly mounted at the bottom end of the positive pole shell, the positive pole shell and the negative pole shell are combined to form a shell, a battery cell piece is arranged in the shell, and the battery cell piece comprises a diaphragm fixedly mounted in the shell. The diaphragm is formed by folding in a Z shape, a positive plate is arranged on one side of the diaphragm, a negative plate is arranged on the other side of the diaphragm, the positive plate and the negative plate are folded in a U-shaped structure, and the tail end part of the positive plate and the top end part of the negative plate are respectively positioned on the upper and lower sides of the middle of the diaphragm. A positive pole piece, a diaphragm and a negative pole piece are stacked in sequence and placed together with the diaphragm, the top end of the positive pole piece and the diaphragm are bent upwards, the tail end of the negative pole piece and the diaphragm are bent downwards to form a Z-shaped structure, the Z-shaped structure is folded to form a battery cell piece, the battery cell piece is attached to a shell for liquid injection, and finally a positive pole shell and a negative pole shell are sealed and folded to the maximum extent. The problem of low space utilization rate is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of button cell preparation, especially relates to a high capacity miniature button cell structure. BACKGROUND

[0002] The button cell is composed of positive and negative shells, positive and negative plates, a diaphragm and electrolyte, and a section of uncoated foil is left at the positive and negative ends of the winding core of the button lithium ion cell, the uncoated foil is spot-welded on the inner wall of the positive and negative shells respectively when entering the shell, then the positive and negative shells are closed, and the space utilization rate is very low after the positive and negative shells are closed, electrolyte is injected and the opening is sealed.

[0003] In the prior art, a button lithium ion cell is disclosed in patent CN102694202B, which comprises a positive shell, a negative shell and a winding core, the positive shell and the negative shell jointly form a shell body, the shell body wraps the winding core, a sealing ring is arranged between the positive shell and the negative shell, one end of the winding core extends out of an aluminum foil, the aluminum foil extends out of an aluminum foil extension body at the end of the aluminum foil, the aluminum foil extension body extends along the radial width of the annular surface of the sealing ring and has a bending part, the bending part is clamped between the positive shell and the sealing ring, and the aluminum foil extension body is clamped between the sealing ring and the positive shell after the battery is sealed.

[0004] The above structure makes the voltage and internal resistance of the button lithium ion cell more stable, but the space utilization rate in the battery shell body is low, the winding core cannot be folded to the maximum extent, and it is difficult to improve the volume energy density under the premise that the battery model is fixed. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing a high capacity miniature button cell structure to solve the problem that the space utilization rate in the battery shell body is low, the winding core cannot be folded to the maximum extent, and it is difficult to improve the volume energy density under the premise that the battery model is fixed.

[0006] In order to achieve the above purpose, the utility model provides a high capacity miniature button cell structure, which comprises a positive shell and a negative shell fixedly installed at the bottom end of the positive shell, the positive shell and the negative shell are combined to form a shell body, an electric core part is arranged in the shell body, and conductive glue corresponding to the electric core part is arranged on the inner side of the positive shell and the negative shell.

[0007] The electric core part comprises a diaphragm fixedly installed in the shell body, the diaphragm is folded into a Z shape, a positive plate is arranged on one side of the diaphragm, and a negative plate is arranged on the other side of the diaphragm, the positive plate and the negative plate are both folded into a U shape, and the end part of the positive plate and the top end part of the negative plate are respectively located on the upper and lower sides of the diaphragm.

[0008] Preferably, the positive electrode sheet and the negative electrode sheet each comprise a single-sided electrode sheet and a double-sided electrode sheet, one end of the single-sided electrode sheet is fixedly connected to the double-sided electrode sheet, and a crimped sheet is arranged at the connection between the single-sided electrode sheet and the double-sided electrode sheet.

[0009] Preferably, the double-sided electrode sheet in the positive electrode sheet is arranged in correspondence with the double-sided electrode sheet in the negative electrode sheet, and the positive electrode sheet corresponds to the positive electrode shell and the negative electrode sheet corresponds to the negative electrode shell.

[0010] Preferably, the positive electrode sheet and the negative electrode sheet are formed by die punching, the single-sided electrode sheet and the double-sided electrode sheet are circular structures, and the radius of the single-sided electrode sheet matches the radius of the double-sided electrode sheet.

[0011] Preferably, the separator is one of a PP separator, a PE separator and a glass fiber separator, and the separator is formed by three circular shapes.

[0012] Preferably, the inner folded part of the separator corresponds to the crimped sheet, and one side of the crimped sheet is provided with an insulating tape.

[0013] The utility model discloses the beneficial effects of:

[0014] After being stacked in the order of the positive electrode sheet, the separator and the negative electrode sheet, the top end of the positive electrode sheet and the separator are bent upwards, and the tail end of the negative electrode sheet and the tail end of the separator are bent downwards to form a Z-shaped structure, and the folded positive electrode sheet forms an electric core piece, the positive electrode shell and the negative electrode shell are coated with conductive glue at the connection with the electric core piece, the electric core piece is attached to the shell, the electric core piece is injected, and finally the positive electrode shell and the negative electrode shell are sealed, the overall design adopts circularly stacked electrode sheets, the electric core is folded to the maximum extent, and the problems of fixed model and low space utilization are solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only the utility model, and other drawings can be obtained by the person skilled in the art without creative labor.

[0016] Figure 1 It is the overall three-dimensional structure schematic diagram of the utility model;

[0017] Figure 2 It is the internal structure schematic diagram of the utility model as a whole;

[0018] Figure 3 It is the structure schematic diagram of the positive electrode sheet and the negative electrode sheet of the utility model;

[0019] Figure 4 It is the structure schematic diagram of the separator of the utility model.

[0020] The figure is marked: 1, positive shell; 2, negative shell; 3, electric core piece; 4, positive sheet; 5, negative sheet; 6, diaphragm; 7, insulating tape; 8, conductive glue; 9, single-sided electrode sheet; 10, double-sided electrode sheet; 11, curling sheet. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following is further detailed in combination with specific embodiments.

[0022] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , a high-capacity micro button cell structure includes a positive shell 1 and a negative shell 2 fixedly installed at the bottom end of the positive shell 1, the positive shell 1 and the negative shell 2 are combined to form a shell, and the inside of the shell is provided with an electric core piece 3, the inside of the positive shell 1 and the negative shell 2 is provided with conductive glue 8 corresponding to the electric core piece 3.

[0023] The electric core piece 3 includes a diaphragm 6 fixedly installed in the shell, the diaphragm 6 is folded into a Z shape, one side of the diaphragm 6 is provided with a positive sheet 4, the other side of the diaphragm 6 is provided with a negative sheet 5, the positive sheet 4 and the negative sheet 5 are both folded into a U-shaped structure, and the end part of the positive sheet 4 and the top end part of the negative sheet 5 are respectively located on the upper and lower sides of the diaphragm 6.

[0024] In this embodiment, the positive sheet 4, the diaphragm 6 and the negative sheet 5 are sequentially stacked, the positive sheet 4 faces upwards, the negative sheet 5 faces downwards, the end part in the positive sheet 4 and the top end part in the negative sheet 5 are respectively stacked on the upper and lower sides of the diaphragm 6, after the diaphragm 6 is placed, the top end of the positive sheet 4 and the diaphragm 6 are bent upwards, the end of the negative sheet 5 and the end of the diaphragm 6 are bent downwards, a Z-shaped structure is formed, the electric core piece 3 is formed after being folded, the positive shell 1 and the negative shell 2 are connected with the electric core piece 3, the conductive glue 8 is applied, the electric core piece 3 is well adhered to the shell, the electric core piece 3 is injected, finally the positive shell 1 and the negative shell 2 are sealed, the overall design adopts a circularly stacked sheet, the electric core is folded to the maximum extent, and the problems of fixed model and low space utilization are solved.

[0025] As an embodiment, as shown in Figure 3 , the positive sheet 4 and the negative sheet 5 both include a single-sided electrode sheet 9 and a double-sided electrode sheet 10, one end of the single-sided electrode sheet 9 is fixedly connected with the double-sided electrode sheet 10, and the connection part of the single-sided electrode sheet 9 and the double-sided electrode sheet 10 is provided with a curling sheet 11.

[0026] In this embodiment, the single-sided electrode sheet 9, the crimping sheet 11 and the double-sided electrode sheet 10 are integrally formed. After the positive electrode sheet 4, the diaphragm 6 and the negative electrode sheet 5 are sequentially stacked together with the diaphragm 6, the single-sided electrode sheet 9 of the positive electrode sheet 4 and the diaphragm 6 are bent upwards, and the single-sided electrode sheet 9 of the negative electrode sheet 5 and the end of the diaphragm 6 are bent downwards, forming a Z-shaped structure, which maximizes the folding volume of the battery cell 3, thereby improving the internal space of the battery.

[0027] As an embodiment, as shown in Figure 2 and Figure 3 The double-sided electrode sheet 10 in the positive electrode sheet 4 and the double-sided electrode sheet 10 in the negative electrode sheet 5 are arranged in an up-down correspondence, and the positive electrode sheet 4 corresponds to the positive electrode shell 1 and the negative electrode sheet 5 corresponds to the negative electrode shell 2.

[0028] In this embodiment, after folding, the single-sided electrode sheet 9 of the positive electrode sheet 4 faces upwards, the single-sided electrode sheet 9 of the negative electrode sheet 5 faces downwards, and the double-sided electrode sheet 10 in the positive electrode sheet 4 and the double-sided electrode sheet 10 in the negative electrode sheet 5 are respectively stacked on the upper and lower sides of the diaphragm 6, thereby forming a complete battery cell 3 inside and ensuring the internal circuit path.

[0029] As an embodiment, as shown in Figure 2 and Figure 3 The positive electrode sheet 4 and the negative electrode sheet 5 are formed by die cutting, the single-sided electrode sheet 9 and the double-sided electrode sheet 10 are circular structures, and the radius of the single-sided electrode sheet 9 and the radius of the double-sided electrode sheet 10 are matched.

[0030] In this embodiment, the positive electrode sheet 4 and the negative electrode sheet 5 are matched in size, and when the positive electrode sheet 4 and the negative electrode sheet 5 are folded again, the radius of the single-sided electrode sheet 9 and the double-sided electrode sheet 10 after folding is matched with the radius of the shell, and the positive electrode sheet 4 and the negative electrode sheet 5 after folding are compressed to a smaller volume.

[0031] As an embodiment, as shown in Figure 4 The diaphragm 6 is one of a PP diaphragm, a PE diaphragm and a glass fiber diaphragm, and the diaphragm 6 is formed in a three-circle combination.

[0032] In this embodiment, the diaphragm 6 is combined in a three-circle combination, and the double-sided circular structure of the positive electrode sheet 4 and the negative electrode sheet 5 is matched, thereby improving the structural stability and providing electrical isolation to prevent direct contact between the positive and negative electrodes of the battery.

[0033] As an embodiment, as shown in Figure 2 The inner folded part of the diaphragm 6 corresponds to the crimping sheet 11, and one side of the crimping sheet 11 is provided with an insulating tape 7.

[0034] In this embodiment, the crimping sheet 11 is provided with an insulating tape 7 on the bending part of the positive electrode sheet 4 and the negative electrode sheet 5 after folding the battery cell 3, which plays a role of fixing and insulation to prevent movement inside the shell.

[0035] Working principle: in use, the positive plate 4 and the negative plate 5 are formed by die punching, and the diaphragm 6 is punched into a three-circle combined structure, first, according to the sequence of the positive plate 4, the diaphragm 6 and the negative plate 5, the single-sided electrode plate 9 of the positive plate 4 faces upwards, the single-sided electrode plate 9 of the negative plate 5 faces downwards, the double-sided electrode plate 10 in the positive plate 4 and the double-sided electrode plate 10 in the negative plate 5 are respectively stacked on the upper and lower sides of the diaphragm 6, after the diaphragm 6 is placed, the single-sided electrode plate 9 of the negative plate 5 and the end of the diaphragm 6 are bent downwards, the single-sided electrode plate 9 of the positive plate 4 and the diaphragm 6 are bent upwards, forming a Z-shaped structure, after folding, the battery cell 3 is formed, the insulating tape 7 is pasted on the outer side of the crimped plate 11 at the bending part of the positive plate 4 and the negative plate 5, which plays a fixing and insulating role, and the positive shell 1 and the negative shell 2 are coated with conductive glue 8 at the connection place of the battery cell 3, the battery cell 3 is pasted with the shell, the battery cell 3 is injected, finally, the positive shell 1 and the negative shell 2 are sealed, the whole adopts a circular design of the stacked plate, the battery cell is folded to the maximum extent, and the problems of fixed model and low space utilization are solved.

[0036] Those skilled in the art will understand that the discussion of any of the above embodiments is merely exemplary and is not intended to suggest that the scope (including the claims) of the present application be limited to these examples; many variations are possible under the teachings of the present application, and the above embodiments or technical features among different embodiments can be combined, steps can be implemented in any order, and there are many other variations of different aspects of the present application as described above, which are not provided in detail.

[0037] The present application is intended to cover all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Accordingly, any and all such modifications, variations, and equivalents that fall within the spirit and scope of the present application are intended to be included within the scope of the present application.

Claims

1. A high capacity micro button cell structure comprising a positive shell (1) and a negative shell (2) fixedly installed at the bottom end of the positive shell (1), characterized in that, The positive shell (1) and the negative shell (2) are combined to form a shell, and the inside of the shell is provided with an electric core piece (3), and the inside of the positive shell (1) and the negative shell (2) is provided with a conductive glue (8) corresponding to the electric core piece (3); The electric core piece (3) includes a diaphragm (6) fixedly installed in the shell, the diaphragm (6) is folded in Z shape, one side of the diaphragm (6) is provided with a positive plate (4), the other side of the diaphragm (6) is provided with a negative plate (5), the positive plate (4) and the negative plate (5) are both folded in U shape, and the end part of the positive plate (4) and the top end part of the negative plate (5) are located on the upper and lower sides of the diaphragm (6) respectively.

2. A high capacity micro-staple cell structure according to claim 1, wherein, The positive plate (4) and the negative plate (5) both include a single-sided electrode plate (9) and a double-sided electrode plate (10), one end of the single-sided electrode plate (9) is fixedly connected with the double-sided electrode plate (10), and the connection part of the single-sided electrode plate (9) and the double-sided electrode plate (10) is provided with a curling plate (11).

3. A high capacity micro-staple cell structure according to claim 1, wherein, The double-sided electrode plate (10) in the positive plate (4) is arranged in correspondence with the double-sided electrode plate (10) in the negative plate (5), and the positive plate (4) corresponds to the positive shell (1) and the negative plate (5) corresponds to the negative shell (2).

4. A high capacity micro-staple cell structure according to claim 2, wherein, The positive plate (4) and the negative plate (5) are formed by die punching, the single-sided electrode plate (9) and the double-sided electrode plate (10) are circular structures, and the radius of the single-sided electrode plate (9) matches the radius of the double-sided electrode plate (10).

5. The high capacity micro-staple cell structure of claim 1, wherein, The diaphragm (6) is one of PP diaphragm, PE diaphragm and glass fiber diaphragm, and the diaphragm (6) is formed by three circular combinations.

6. A high capacity micro-staple cell structure according to claim 2, wherein, The inside folding part of the diaphragm (6) corresponds to the curling plate (11), and one side of the curling plate (11) is provided with an insulating tape (7).

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