Soft pack button battery

Abstract

The present invention relates to a soft-pack button battery, comprising a pole core and a soft-pack shell; the soft-pack shell comprises a shell that wraps the pole core and a sealing edge that seals the shell; the sealing edge comprises a top seal located at one end face of the pole core, and a first side seal and a second side seal located at both sides of the pole core respectively; the first side seal and the second side seal are respectively attached to the outer periphery of the shell; the pole core is formed by winding a first pole piece, a diaphragm and a second pole piece, and the first pole piece and the second pole piece have opposite polarities; a first pole ear is led out from the first pole piece, and the first pole ear passes through the soft-pack shell from the top seal; a second pole ear is led out from the second pole piece, and the second pole ear passes through the soft-pack shell from the first side seal along the tangent direction of the pole core, and the part of the second pole ear exposed from the soft-pack shell comprises a side pole ear section attached to the outer periphery of the shell and a transfer pole ear section connected to one end of the side pole ear section, and the transfer pole ear section is led out in the same direction as the first pole ear. The width of the soft-pack button battery of the present invention is less than 7 mm, and can be made into a soft-pack button battery of smaller size.

Description

Technical Field

[0001] The invention belongs to the technical field of soft-pack batteries, and in particular relates to a soft-pack button battery. Background Art

[0002] Soft-pack batteries are batteries that use polymer (usually aluminum-plastic film) as the outer shell. Compared with hard-shell batteries, soft-pack batteries have the following advantages:

[0003] (1) Good safety. The soft-pack battery structure adopts aluminum-plastic film packaging. When thermal management is out of control or punctured, the aluminum-plastic film shell will provide a buffer space for the battery cell, causing swelling and deformation, and eventually only fire or smoke will occur, but no explosion will occur.

[0004] (2) Light weight and high energy density: Soft-pack batteries are 40% lighter than steel-shell batteries of the same capacity and 20% lighter than aluminum-shell batteries, so they usually have a higher energy density.

[0005] (3) Good electrochemical performance and long life: The internal resistance of soft-pack batteries is small, which can greatly reduce the battery's self-consumption. In addition, soft-pack batteries have a longer cycle life.

[0006] The width of the soft-pack battery is determined by the width of the lead-out tab. In order to make a smaller soft-pack battery, the positive and negative tabs of the existing soft-pack battery are generally led out from the two ends of the pole core, but because it is impossible to ensure that the positive and negative tabs are located in the same plane, it is necessary to form a sealing edge on each of the two end faces of the pole core when the pole core is encapsulated with an aluminum-plastic composite film, thereby increasing the axial length of the soft-pack battery and affecting the volume energy density of the soft-pack battery. When the positive and negative tabs of the soft-pack battery are led out in the same direction from one end face of the pole core, the minimum width of the soft-pack battery is 7 mm due to the limitations of the width of the tab, the width of the tab glue, and the spacing between the tabs. Therefore, it is impossible to meet the installation requirements of soft-pack batteries with a width of less than 7 mm and positive and negative tabs led out in the same direction. Summary of the invention

[0007] The technical problem to be solved by the present invention is: to provide a soft-pack button battery to address the problem that the width of the existing soft-pack battery is large when the positive and negative electrodes of the soft-pack battery are led out in the same direction.

[0008] In order to solve the above technical problems, an embodiment of the present invention provides a soft-pack button battery, comprising a core and a soft-pack shell;

[0009] The soft package shell includes an outer shell that wraps the pole core and an edge seal that seals the outer shell; the edge seal includes a top seal located at one end surface of the pole core, and a first side seal and a second side seal located at both sides of the pole core respectively; the first side seal and the second side seal are respectively attached to the outer periphery of the outer shell;

[0010] The pole core is formed by winding a first pole piece, a diaphragm and a second pole piece, and the first pole piece and the second pole piece have opposite polarities; a first pole ear is led out from the first pole piece, and the first pole ear passes through the soft-package shell from the top seal; a second pole ear is led out from the second pole piece, and the second pole ear passes through the soft-package shell from the first side seal along the tangent direction of the pole core, and the part of the second pole ear exposed from the soft-package shell includes a side pole ear section attached to the outer periphery of the shell and a transition pole ear section connected to one end of the side pole ear section, and the transition pole ear section is led out in the same direction as the first pole ear.

[0011] Optionally, the first pole lug is fixed to the head of the first pole piece along the winding direction.

[0012] Optionally, an extending direction of the first pole lug is perpendicular to a winding direction of the first pole sheet.

[0013] Optionally, the second pole lug is fixed to the tail of the second pole piece along the winding direction.

[0014] Optionally, the portion of the second pole lug located inside the soft-package shell is an internal pole lug segment; the internal pole lug segment is connected to the second pole piece, and an extension direction of the internal pole lug segment is the same as a winding direction of the second pole piece; the internal pole lug segment and the side pole lug segment are integrally formed.

[0015] Optionally, the transition tab segment is perpendicular to the side tab segment.

[0016] Optionally, the soft-package button battery further includes insulating tape, and the insulating tape covers the side tab segment to fix the side tab segment on the outer periphery of the shell.

[0017] Optionally, the insulating tape completely covers the outer circumference of the shell, the portion of the first side seal attached to the shell, the portion of the second side seal attached to the shell, and the portion of the second tab attached to the shell.

[0018] Optionally, a first sealant is provided at a connection between the first pole lug and the first pole piece, and a second sealant is provided at a connection between the second pole lug and the second pole piece.

[0019] Optionally, a section of the first pole tab located in the soft-package shell and not provided with the first sealant is coated with the first pole tab glue; a section of the second pole tab located in the soft-package shell and not provided with the second sealant is coated with the second pole tab glue.

[0020] The soft-pack button battery provided in the embodiment of the present invention is compared with the prior art. The first pole ear of the soft-pack button battery of the present invention is led out from one end face of the pole core, and the second pole ear is led out from the side face of the pole core along the tangent direction of the pole core, so that the first pole ear and the second pole ear are located in the same plane for packaging. Compared with the battery in which the first pole ear and the second pole ear are led out from the two end faces of the pole core respectively, the soft-pack button battery of the present invention reduces one top seal, thereby reducing the increase in the length of the soft-pack button battery in the axial direction of the pole core and increasing the volume energy density; compared with the battery in which the first pole ear and the second pole ear are directly led out from one end face of the pole core, the soft-pack button battery of the present invention reduces one top seal, thereby reducing the increase in the length of the soft-pack button battery in the axial direction of the pole core and increasing the volume energy density; In the battery, the side pole ear segment of the second pole ear of the present invention is led out from the side of the pole core, and the adapter pole ear segment of the second pole ear is connected to the side pole ear segment and led out in the same direction as the first pole ear, so that the second pole ear is finally led out from the same end of the pole core in the same direction as the first pole ear, thereby avoiding the limitation of the pole ear spacing and the pole ear width on the width of the soft-pack button battery. The width of the soft-pack button battery of the present invention can break through the minimum limit (7㎜) of the width of the existing soft-pack battery, so that the width of the soft-pack button battery can be less than 7mm, and a smaller-sized soft-pack button battery can be made, thereby expanding the application range of the soft-pack button battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a soft-pack button battery provided by an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a soft-package button battery provided by another embodiment of the present invention;

[0023] Figure 3 It is a schematic structural diagram of a first side seal and a second side seal of a soft-package button battery provided by an embodiment of the present invention before being bent.

[0024] Figure 4 yes Figure 3 AA section view;

[0025] Figure 5 is a schematic structural diagram of a first pole piece and a first pole tab before winding provided by an embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the second pole piece and the second pole tab before winding provided by one embodiment of the present invention.

[0027] The reference numerals in the specification are as follows:

[0028] 1. pole core; 11. first pole piece; 12. diaphragm; 13. second pole piece;

[0029] 2. Soft package shell; 21. Shell; 22. Top seal; 23. First side seal; 24. Second side seal;

[0030] 3. The first tab;

[0031] 4. Second pole ear; 41. Side pole ear section; 42. Transfer pole ear section; 43. Internal pole ear section;

[0032] 5. Insulating tape; 6. First ear glue; 7. Second ear glue. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] like Figure 1 and Figure 4 As shown, the soft-package button battery provided in the embodiment of the present invention comprises a core 1 and a soft-package shell 2;

[0035] The soft package shell 2 includes a shell 21 that wraps the pole core 1 and a sealing edge that seals the shell 21; the sealing edge includes a top seal 22 located at one end surface of the pole core 1, and a first side seal 23 and a second side seal 24 located at both sides of the pole core 1; the first side seal 23 and the second side seal 24 are respectively attached to the outer periphery of the shell 21;

[0036] The pole core 1 is formed by winding a first pole piece 11, a diaphragm 12 and a second pole piece 13, and the first pole piece 11 and the second pole piece 13 have opposite polarities; a first pole ear 3 is led out from the first pole piece 11, and the first pole ear 3 passes through the soft-package shell 2 from the top seal 22; a second pole ear 4 is led out from the second pole piece 13, and the second pole ear 4 passes through the soft-package shell 2 from the first side seal 23 along the tangent direction of the pole core 1, and the part of the second pole ear 4 exposed from the soft-package shell 2 includes a side pole ear section 41 attached to the outer periphery of the shell 21 and a transition pole ear section 42 connected to one end of the side pole ear section 41, and the transition pole ear section 42 is led out in the same direction as the first pole ear 3.

[0037] In the soft-pack button battery provided in the embodiment of the present invention, compared with the prior art, the first pole ear 3 of the soft-pack button battery of the present invention is led out from one end face of the pole core 1, and the second pole ear 4 is led out from the side face of the pole core 1 along the tangent direction of the pole core 1, so that the first pole ear 3 and the second pole ear 4 are located in the same plane for packaging. Compared with the battery in which the first pole ear 3 and the second pole ear 4 are led out from the two end faces of the pole core 1 respectively, the soft-pack button battery of the present invention reduces a top seal 22, thereby reducing the increase in the length of the soft-pack button battery in the axial direction of the pole core 1 and increasing the volume energy density; compared with the battery in which the first pole ear 3 and the second pole ear 4 are directly led out from one end face of the pole core 1, the first pole ear 3 and the second pole ear 4 are located in the same plane for packaging. In a battery with a second pole lug 4, a side pole lug segment 41 of the second pole lug 4 of the present invention is led out from the side of the pole core 1, and a transition pole lug segment 42 of the second pole lug 4 is connected to the side pole lug segment 41 and led out in the same direction as the first pole lug 3, so that the second pole lug 4 is finally led out from the same end of the pole core 1 in the same direction as the first pole lug 3, thereby avoiding the limitation of the pole lug spacing and the pole lug width on the width of the soft-pack button battery. The width of the soft-pack button battery of the present invention can break through the minimum limit (7㎜) of the width of the existing soft-pack battery, so that the width of the soft-pack button battery can be less than 7mm, and a smaller soft-pack button battery can be made, thereby expanding the scope of application of the soft-pack button battery.

[0038] Specifically, the soft-pack shell 2 is an aluminum-plastic composite film shell; the pole core 1 is placed on a sheet of aluminum-plastic composite film, and then the aluminum-plastic composite film is bent to wrap the pole core 1 and seal it, thereby forming the soft-pack shell 2 outside the pole core 1 .

[0039] In one embodiment, if Figure 5 As shown, the first pole ear 3 is fixed at the head of the first pole sheet 11 along the winding direction; the first pole ear 3 is led out from the middle of one end surface of the pole core 1, and will not increase the width of the pole core 1, thereby enabling the production of soft-pack button batteries with smaller width.

[0040] In one embodiment, if Figure 5 As shown, the extension direction of the first pole ear 3 is perpendicular to the winding direction of the first pole piece 11; the first pole ear 3 is led out from the end face of the pole core 1 along the axial direction of the pole core 1, which is beneficial to the connection between the first pole ear 3 and the first pole piece 11, and is convenient for leading out the second pole ear 4 for connection with other electronic components, and facilitating the winding of the first pole piece 11.

[0041] In one embodiment, if Figure 6 As shown, the second pole lug 4 is fixed at the tail of the second pole sheet 13 along the winding direction; the second pole lug 4 is led out from the side of the pole core 1, which increases the distance between the first pole lug 3 and the second pole lug 4, avoids the limitation of the pole lug spacing and pole lug width on the width of the soft-pack button battery, and facilitates the connection and lead-out of the second pole lug 4.

[0042] In one embodiment, if Figure 6As shown, the portion of the second pole lug 4 located inside the soft-pack shell 2 is the internal pole lug segment 43; the internal pole lug segment 43 is connected to the second pole piece 13, and the extension direction of the internal pole lug segment 43 is the same as the winding direction of the second pole piece 13; the internal pole lug segment 43 is integrally formed with the side pole lug segment 41; the second pole lug 4 is led out from the side of the pole core 1 along the tangential direction of the pole core 1, which is beneficial to the connection between the second pole lug 4 and the second pole piece 13 and facilitates the winding of the second pole piece 13.

[0043] In one embodiment, if Figure 1 As shown, the transfer tab segment 42 is perpendicular to the side tab segment 41 , which facilitates the connection between the transfer tab segment 42 and the side tab segment 41 and facilitates the connection between the second tab 4 and other electronic components.

[0044] Specifically, the transition tab segment 42 is welded to the side tab segment 41 .

[0045] In one embodiment, if Figure 2 As shown, the soft-pack button battery also includes an insulating tape 5, which covers the side tab segment 41 to fix the side tab segment 41 on the periphery of the shell 21; the side tab segment 41 can be more firmly fixed on the shell 21 to avoid the side tab segment 41 from breaking, and plays an insulating and protective role for the side tab segment 41; the side tab segment 41 is more tightly connected to the shell 21, which can reduce the overall width of the soft-pack button battery.

[0046] In one embodiment, if Figure 2 As shown, the insulating tape 5 completely covers the outer periphery of the shell 21, the portion of the first side seal 23 attached to the shell 21, the portion of the second side seal 24 attached to the shell 21, and the portion of the second pole ear 4 attached to the shell 21; this makes the connection between the first side seal 23, the second side seal 24, and the second pole ear 4 and the shell 21 tighter, which can reduce the overall width of the soft-pack button battery; it can also play a better insulating protection role, and avoid the portion of the second pole ear 4 attached to the outer periphery of the shell 21 from abutting against other structures to produce electrical connection.

[0047] In one embodiment, not shown in the figure, a first sealant is provided at the connection between the first pole tab 3 and the first pole piece 11 ; the first sealant can cover the connection between the first pole tab 3 and the first pole piece 11 , and can better protect the first pole piece 11 and the first pole tab 3 .

[0048] In one embodiment, not shown in the figure, a second sealant is provided at the connection between the second pole tab 4 and the second pole piece 13 ; the second sealant can cover the connection between the second pole tab 4 and the second pole piece 13 , and can better protect the second pole piece 13 and the second pole tab 4 .

[0049] In one embodiment, if Figure 3 , Figure 4 and Figure 5As shown, a section of the first pole tab 3 located in the soft-package shell 2 and not provided with the first sealant is coated with the first pole tab glue 6; the first pole tab glue 6 is provided so that the first pole tab 3 will not directly contact the top seal 22 when passing through the soft-package shell 2, thereby preventing the first pole tab 3 from reacting with the top seal 22 and corroding the top seal 22;

[0050] In one embodiment, if Figure 3 , Figure 4 and Figure 6 As shown, a section of the second pole ear 4 that is not provided with the second sealant and is located inside the soft-package shell 2 is coated with the second pole ear glue 7; the second pole ear glue 7 is provided so that the second pole ear 4 passes through the soft-package shell 2 from the first side seal 23 without directly contacting the first side seal 23, thereby preventing the second pole ear 4 from reacting with the first side seal 23 to corrode the top seal 22.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A soft-pack button battery, characterized in that: Including a pole core and a soft-pack shell; The soft package shell includes an outer shell that wraps the pole core and an edge seal that seals the outer shell; the edge seal includes a top seal located at one end surface of the pole core, and a first side seal and a second side seal located at both sides of the pole core respectively; the first side seal and the second side seal are respectively attached to the outer periphery of the outer shell; The pole core is formed by winding a first pole piece, a diaphragm and a second pole piece, and the first pole piece and the second pole piece have opposite polarities; a first pole ear is led out from the first pole piece, and the first pole ear passes through the soft package shell from the top seal; A second pole lug is led out from the second pole piece, and the second pole lug passes through the soft-package shell from the first side seal along the tangent direction of the pole core, and the portion of the second pole lug exposed from the soft-package shell includes a side pole lug section attached to the outer periphery of the shell and a transition pole lug section connected to one end of the side pole lug section, and the transition pole lug section is led out in the same direction as the first pole lug; The portion of the second pole lug located inside the soft-package shell is an internal pole lug segment; the internal pole lug segment is connected to the second pole piece, and the extension direction of the internal pole lug segment is the same as the winding direction of the second pole piece; the internal pole lug segment is integrally formed with the side pole lug segment; The transfer tab segment is perpendicular to the side tab segment.

2. The soft-pack button battery according to claim 1, characterized in that: The first pole lug is fixed to the head of the first pole piece along the winding direction.

3. The soft-pack button battery according to claim 2, characterized in that: An extending direction of the first pole tab is perpendicular to a winding direction of the first pole sheet.

4. The soft-pack button battery according to claim 1, characterized in that: The second pole lug is fixed to the tail of the second pole piece along the winding direction.

5. The soft-pack button battery according to claim 1, characterized in that: The soft-package button battery further includes insulating adhesive paper, which covers the side tab segment to fix the side tab segment on the outer periphery of the shell.

6. The soft-pack button battery according to claim 5, characterized in that: The insulating tape completely covers the outer circumference of the shell, the portion where the first side seal is attached to the shell, the portion where the second side seal is attached to the shell, and the portion where the second tab is attached to the shell.

7. The soft-pack button battery according to claim 1, characterized in that: A first sealant is provided at a connection between the first pole tab and the first pole piece, and a second sealant is provided at a connection between the second pole tab and the second pole piece.

8. The soft-pack button battery according to claim 7, characterized in that: A section of the first pole tab located in the soft-package shell and not provided with the first sealant is coated with the first pole tab glue; a section of the second pole tab located in the soft-package shell and not provided with the second sealant is coated with the second pole tab glue.

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