Button cell

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a button battery. The button battery comprises a shell, a winding pole core, a positive pole switching piece, a positive pole external connection piece, a negative pole switching piece and a negative pole external connection piece, the winding pole core is installed in the shell, the positive pole switching piece is attached to the end face of one axial end of the shell, and the negative pole switching piece is attached to the end face of the other axial end of the shell; one end of the positive electrode adapter sheet is electrically connected with the positive electrode lug, and the positive electrode external connection piece is connected with the positive electrode adapter sheet at a first position; one end of the negative electrode switching piece is electrically connected with the negative electrode lug, the negative electrode external connecting piece is connected with the negative electrode switching piece at a second position, and the first position and the second position are aligned in the circumferential direction of the winding pole core. The influence of the included angle tolerance between the positive pole lug and the negative pole lug of the winding pole core on the first position and the second position is eliminated, so that the first position and the second position are always aligned in the circumferential direction of the winding pole core, and a magnetic field generated by the positive pole lug and a magnetic field generated by the negative pole lug can be offset to the maximum extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a button battery. Background Art

[0002] Button batteries are widely used in electronic devices such as wireless Bluetooth headsets.

[0003] The electrode core inside a button battery is generally a wound electrode core, which is usually formed by winding a positive electrode sheet, a separator, and a negative electrode sheet after stacking. The positive electrode sheet is connected to a positive electrode tab, and the negative electrode sheet is connected to a negative electrode tab. However, in the winding process of the wound electrode core, the length of the negative electrode sheet is greater than that of the positive electrode sheet, resulting in an angle between the positive electrode tab and the negative electrode tab in the circumferential direction of the wound electrode core. As a result, the magnetic fields generated by the positive electrode tab and the negative electrode tab after power-on cannot be completely canceled out, and the additional magnetic field generated by the negative electrode tab will interfere with the surrounding electromagnetic sensitive devices, reducing the quality of the electronic device and the user experience.

[0004] In order to reduce the influence of the additional magnetic field generated by the negative electrode tab on the electronic device, a demagnetizing sheet is usually provided on the button battery to eliminate the additional magnetic field generated by the negative electrode tab by using the magnetic field generated by the demagnetizing sheet. However, the demagnetizing effect of the demagnetizing sheet on the button battery is not ideal. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is: aiming at the problem that the demagnetizing effect of the existing demagnetizing sheet of the button battery on the button battery is not ideal, a button battery is provided.

[0006] To solve the above technical problem, an embodiment of the utility model provides a button battery, which includes a housing, a wound electrode core, a positive electrode adapter, a positive electrode external connection, a negative electrode adapter, and a negative electrode external connection. The wound electrode core is installed inside the housing. The positive electrode adapter is attached to an end face at one axial end of the housing, and the negative electrode adapter is attached to an end face at the other axial end of the housing;

[0007] One end of the positive electrode adapter is electrically connected to the positive electrode tab of the wound electrode core, and the positive electrode external connection is connected to the other end of the positive electrode adapter at a first position;

[0008] One end of the negative electrode adapter is electrically connected to the negative electrode tab of the wound electrode core, and the negative electrode external connection is connected to the other end of the negative electrode adapter at a second position. The first position and the second position are aligned in the circumferential direction of the wound electrode core.

[0009] Optionally, the positive current collector tab includes a radial section and a circumferential section. The circumferential section extends along the circumference of the wound electrode core. The outer radial end of the radial section is connected to one end of the circumferential section. The inner radial end of the radial section is electrically connected to the positive current collector lug. The other end of the circumferential section is connected to the positive external connection member at the first position.

[0010] Optionally, the theoretical designed included angle between the positive current collector lug and the negative current collector lug in the circumferential direction of the wound electrode core is 90°. The range of the central angle subtended by the circumferential section is 20° to 180°.

[0011] Optionally, the radial section includes an extension section and a fixed section distributed along its extending direction. The minimum width of the extension section is greater than the maximum width of the fixed section. The outer radial end of the extension section is connected to one end of the circumferential section. The inner radial end of the extension section is connected to the fixed section.

[0012] Optionally, the extension section is in a straight strip shape. The extension section extends radially along the circumferential section. The end of the fixed section is located at the center of the circle of the circumferential section.

[0013] Optionally, the fixed section is circular.

[0014] Optionally, the negative current collector tab is in a straight bar shape and extends radially along the wound electrode core.

[0015] Optionally, the negative current collector tab includes a wide section and a narrow section distributed along its extending direction. The wide section is welded to the housing. The negative external connection member is connected to the narrow section.

[0016] Optionally, the positive external connection member is welded to the positive current collector tab. The negative external connection member is welded to the negative current collector tab.

[0017] Optionally, the positive external connection member is a lead wire, a nickel sheet or an FPC;

[0018] And / or,

[0019] The negative external connection member is a lead wire, a nickel sheet or an FPC.

[0020] Optionally, the housing includes a shell and a cover plate. The shell has an inner cavity with one end open. The wound electrode core is installed in the inner cavity. The cover plate is hermetically sealed on the shell;

[0021] The cover plate includes a plate body and a pole post. The plate body is an insulating member. A first through hole penetrating through the two side surfaces in the thickness direction of the plate body is provided at the middle position of the plate body. The pole post passes through the first through hole and protrudes from the plate body. The pole post is electrically connected to the positive current collector lug. The positive current collector tab is attached to the top surface of the pole post.

[0022] In the button cell of the present utility model, the positive transfer piece is attached to the axial end face of one end of the housing and electrically connected to the positive ear, and the negative transfer piece is attached to the axial end face of the other end of the housing and electrically connected to the negative ear. Since the positive external connection is connected to the positive transfer piece and the negative external connection is connected to the negative transfer piece, when processing the button cell, the connection position of the positive external connection on the positive transfer piece, that is, the first position, or the connection position of the negative external connection and the negative transfer piece, that is, the second position, can be adjusted according to the actual winding positions of the positive ear and the negative ear, so as to compensate for the tolerance between the actual angle and the theoretical angle between the positive ear and the negative ear, and eliminate the influence of the angle tolerance between the positive pole ear and the negative pole ear of the wound pole core on the first position and the second position, so that the first position and the second position are always aligned in the circumferential direction of the wound pole core. Thus, the magnetic fields generated by the positive ear and the negative ear can be offset to the greatest extent, achieving the maximum reduction of the magnetic field intensity of the button cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural view of a button cell provided by an embodiment of the present utility model;

[0024] Figure 2 is Figure 1 a schematic structural view of another perspective;

[0025] Figure 3 is Figure 1 a top view of;

[0026] Figure 4 is Figure 1 a top view of;

[0027] Figure 5 is Figure 1 a schematic view of the actual installation position and the theoretical installation position of the positive transfer piece in;

[0028] The reference signs in the specification are as follows:

[0029] 1. Outer shell; 11. Housing; 12. Cover plate; 121. Terminal post; 13. Positive ear; 14. Negative ear; 2. Positive transfer piece; 21. Radial section; 211. Extension section; 212. Fixed section; 22. Circumferential section; 3. Positive external connection; 4. Negative external connection; 5. Negative transfer piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0031] AsFigure 1 and Figure 2 As shown in Figure 2 , an embodiment of the present utility model provides a button cell, which includes a housing 1, a wound electrode core, a positive electrode adapter piece 2, a positive electrode external connection piece 3, a negative electrode adapter piece 5 and a negative electrode external connection piece 4. The wound electrode core is installed in the housing 1. The positive electrode adapter piece 2 is attached to the axial end face of one end of the housing 1, and the negative electrode adapter piece 5 is attached to the axial end face of the other end of the housing 1.

[0032] The wound electrode core is formed by winding a positive electrode sheet and a negative electrode sheet. Positive electrode tabs 13 connecting the positive electrode sheet and negative electrode tabs 14 connecting the negative electrode sheet are respectively provided at opposite ends of the wound electrode core. A separator is provided between the positive electrode sheet and the negative electrode sheet, so that the positive electrode sheet and the negative electrode sheet do not conduct electricity. The winding process of the wound electrode core is a well-known technology in the art and will not be elaborated here.

[0033] The positive electrode tabs 13 are folded on the axial end face of one end of the wound electrode core, and the negative electrode tabs 14 are folded on the axial end face of the other end of the wound electrode core. Moreover, the length of the negative electrode tabs 14 is greater than that of the positive electrode tabs 13. It can be understood that there is an angle between the positive electrode tabs 13 and the negative electrode tabs 14 in the circumferential direction of the wound electrode core.

[0034] Specifically, the number of winding turns of the positive electrode sheet and the negative electrode sheet is the same, and the current directions on the positive electrode sheet and the negative electrode sheet are opposite. The current directions on the positive electrode tabs 13 connected to the positive electrode sheet and the negative electrode tabs 14 connected to the negative electrode sheet are also opposite. The magnetic field generated by the positive electrode sheet can cancel the magnetic field generated by the negative electrode sheet. However, since the length of the negative electrode tabs 14 is greater than that of the positive electrode tabs 13 and there is an angle between the positive electrode tabs 13 and the negative electrode tabs 14 in the circumferential direction of the wound electrode core, the positive electrode lead-out position and the negative electrode lead-out position of the button cell are different in the circumferential direction of the wound electrode core. The magnetic field generated by the positive electrode tabs 13 can only cancel part of the magnetic field generated by the negative electrode tabs 14, and the extra magnetic field generated by the negative electrode tabs 14 cannot be cancelled, resulting in the button cell generating a magnetic field when powered on and interfering with electronic products.

[0035] As Figure 3 and Figure 4 shown, in the button cell of the present utility model, one end of the positive electrode adapter piece 2 is electrically connected to the positive electrode tabs 13 of the wound electrode core, and the positive electrode external connection piece 3 is connected to the other end of the positive electrode adapter piece 2 at a first position. One end of the negative electrode adapter piece 5 is electrically connected to the negative electrode tabs 14 of the wound electrode core, and the negative electrode external connection piece 4 is connected to the other end of the negative electrode adapter piece 5 at a second position.

[0036] The button cell is electrically connected to an external electrical device through the positive electrode external connection piece 3 and the negative electrode external connection piece 4, that is, the button cell supplies power to the external electrical device through the positive electrode external connection piece 3 and the negative electrode external connection piece 4.

[0037] The first position is aligned with the second position in the circumferential direction of the wound electrode core, so that the positive electrode connecting piece 2 can compensate for the arc by which the positive electrode tab 13 is shorter than the negative electrode tab 14 in the circumferential direction of the wound electrode core, making the positive electrode lead-out position and the negative electrode lead-out position of the button battery the same. Furthermore, the magnetic fields generated by the positive electrode tab 13 and the negative electrode tab 14 can be cancelled out to the greatest extent, so as to reduce the influence of the magnetic field generated by the included angle between the positive electrode tab 13 and the negative electrode tab 14.

[0038] As Figure 5 shown, there may be a certain deviation between the actual winding positions of the positive electrode plate and the negative electrode plate of each wound electrode core and the theoretically designed positions, resulting in a change in the included angle between the positive electrode tab 13 and the negative electrode tab 14 of the wound electrode cores on the production line, that is, the included angle tolerance. Figure 5 In [reference], A refers to the position of the theoretical positive electrode tab 13 relative to the negative electrode tab 14, and A' refers to the position of the actual positive electrode tab 13 relative to the negative electrode tab 14. If a demagnetizing sheet with a constant length in the prior art is used for demagnetization, the positive electrode lead-out position and the negative electrode lead-out position of the button battery cannot be aligned in the circumferential direction.

[0039] In the button battery of the present invention, since the positive electrode external connection member 3 is connected to the positive electrode connecting piece 2 and the negative electrode external connection member 4 is connected to the negative electrode connecting piece 5, when processing the button battery, the connection position of the positive electrode external connection member 3 on the positive electrode connecting piece 2, that is, the first position, or the connection position of the negative electrode external connection member 4 and the negative electrode connecting piece 5, that is, the second position, can be adjusted according to the actual winding positions of the positive electrode tab 13 and the negative electrode tab 14, so as to compensate for the tolerance between the actual included angle and the theoretical included angle between the positive electrode tab 13 and the negative electrode tab 14, eliminate the influence of the included angle tolerance between the positive electrode tab and the negative electrode tab of the wound electrode core on the first position and the second position, and make the first position and the second position always aligned in the circumferential direction of the wound electrode core. Thus, the magnetic fields generated by the positive electrode tab 13 and the negative electrode tab 14 can be cancelled out to the greatest extent, achieving the greatest reduction in the magnetic field intensity of the button battery.

[0040] In the button cell of the present utility model, the positive electrode adapter piece 2 is attached to the axial end face of one end of the housing 11 and electrically connected to the positive electrode tab 13, and the negative electrode adapter piece 5 is attached to the axial end face of the other end of the housing 11 and electrically connected to the negative electrode tab 14. Since the positive electrode external connection piece 3 is connected to the positive electrode adapter piece 2 and the negative electrode external connection piece 4 is connected to the negative electrode adapter piece 5, when processing the button cell, the connection position of the positive electrode external connection piece 3 on the positive electrode adapter piece 2, that is, the first position, or the connection position of the negative electrode external connection piece 4 and the negative electrode adapter piece 5, that is, the second position, can be adjusted according to the actual winding positions of the positive electrode tab 13 and the negative electrode tab 14, so as to compensate for the tolerance between the actual angle and the theoretical angle between the positive electrode tab 13 and the negative electrode tab 14, eliminate the influence of the angle tolerance between the positive electrode tab and the negative electrode tab of the wound electrode core on the first position and the second position, and make the first position and the second position always aligned in the circumferential direction of the wound electrode core. Thus, the magnetic fields generated by the positive electrode tab 13 and the negative electrode tab 14 can be offset to the greatest extent, achieving the maximum reduction of the magnetic field intensity of the button cell.

[0041] In one embodiment, as Figure 1 shown, the positive electrode adapter piece 2 includes a radial section 21 and a circumferential section 22. The circumferential section 22 extends along the circumferential direction of the wound electrode core. The radially inner end of the radial section 21 is electrically connected to the positive electrode tab 13, the radially outer end of the radial section 21 is connected to one end of the circumferential section 22, and the other end of the circumferential section 22 is connected to the positive electrode external connection piece 3 at the first position.

[0042] In one embodiment, the positive electrode external connection piece 3 is fixedly welded on the circumferential section 22, and the negative electrode external connection piece 4 is fixedly welded on the negative electrode adapter piece 5.

[0043] In one embodiment, the negative electrode adapter piece 5 is fixedly welded on the outer shell 1.

[0044] In one embodiment, the outer shell 1 includes a housing 11 and a cover plate 12. The housing 11 has an inner cavity with one end open, and the wound electrode core is installed in the inner cavity. The cover plate 12 is hermetically sealed on the housing 11.

[0045] The bottom wall of the housing 11 is in contact electrical connection with the negative electrode tab 14 of the wound electrode core. Therefore, the housing 11 is equivalent to the negative electrode of the button cell. The cover plate 12 includes a plate body and a pole column 121. The plate body is an insulating member. The edge of the plate body is welded on the housing 11. A first through hole penetrating through the two side surfaces in the thickness direction is provided at the middle position of the plate body. The pole column 121 is inserted through the first through hole and protrudes from the plate body. The pole column 121 is electrically connected to the positive electrode tab 13, and the positive electrode adapter piece 2 is attached to the top surface of the pole column 121 to realize the electrical connection between the positive electrode external connection piece 3 and the positive electrode tab 13.

[0046] The central pole of the existing button battery is in three pieces and is not stressed. When the central pole is used as the positive electrode lead-out position of the button battery, if pressed downward, there is a risk of detachment. For the button battery of the present utility model, the positive electrode lead-out position is transferred to the edge of the button battery, and there is a stainless steel shell 1 for support, which can bear force.

[0047] In one embodiment, as Figure 3 shown, the outer diameter of the circumferential segment 22 is smaller than the inner diameter of the housing 11. Since the housing 11 of the button battery is equivalent to the negative electrode of the button battery, when the outer diameter of the circumferential segment 22 is smaller than the inner diameter of the housing 11, the circumferential segment 22 does not contact the housing 11, and there is no need to provide an insulating material between the circumferential segment 22 and the housing 11, so as to simplify the structure and reduce the cost.

[0048] In one embodiment, as Figure 3 shown, the theoretically designed included angle between the positive electrode tab 13 and the negative electrode tab 14 in the circumferential direction of the wound electrode core is 90°, and the range of the central angle of the arc subtended by the circumferential segment 22 is 20° to 180°. As Figure 3 shown, the central angle of the arc subtended by the circumferential segment 22 is 90°.

[0049] In one embodiment, as Figure 1 shown, the radial segment 21 includes an extension segment 211 and a fixed segment 212 distributed along its extension direction. The outer radial end of the extension segment 211 is connected to one end of the circumferential segment 22, and the inner radial end of the extension segment 211 is connected to the fixed segment 212. The width of the fixed segment 212 is larger, which is convenient for fixing the fixed segment 212 on the pole 121 of the housing 1.

[0050] In one embodiment, the extension segment 211 is straight, the extension segment 211 extends radially along the circumferential segment 22, and the end of the fixed segment 212 is located at the center of the circumferential segment 22. When the positive electrode adapter 2 is attached to the axial end face of the housing 1, after the end of the fixed segment 212 coincides with the center of the housing 1, the outer radial surface of the circumferential segment 22 can be fitted with the outer wall of the wound electrode core, so as to improve the installation efficiency. The so-called "fitting" means that the distance between the outer radial surface of the circumferential segment 22 and the inner wall of the housing 1 is equal.

[0051] In one embodiment, the fixed segment 212 is circular. When the fixed segment 212 is attached to the circular pole 121, it is convenient to locate the center position of the pole 121.

[0052] In one embodiment, the negative electrode adapter 5 is straight, with a simple structure and convenient for processing.

[0053] In one embodiment, as Figure 4 shown, the negative electrode adapter 5 includes a wide segment and a narrow segment distributed along its extension direction. The wide segment is welded to the housing 1, and the negative electrode external connection 4 is connected to the narrow segment.

[0054] Specifically, since the outer shell 1 is equivalent to the negative electrode of the button battery, the wide segment is welded and fixed to the bottom wall of the outer shell 1, and thus, the electrical connection between the wide segment and the negative electrode tab 14 can be achieved. Two slots penetrating through the two side surfaces in the thickness direction are provided on the wide segment. When the wide segment is welded and fixed to the outer shell 1, the slots can increase the resistance and enhance the welding heat, so that the fusion strength formed at the welding joint between the wide segment and the outer shell 1 is relatively high and the welding stability is good.

[0055] In one embodiment, the positive electrode external connection member 3 is a lead wire, a nickel sheet or an FPC;

[0056] The negative electrode external connection member 4 is a lead wire, a nickel sheet or an FPC.

[0057] In one embodiment, both the positive electrode external connection member 3 and the negative electrode external connection member 4 are lead wires, and the positive electrode external connection member 3 and the negative electrode external connection member 4 are aligned in the circumferential direction of the wound electrode core and led out in the same direction. After the negative electrode external connection member 4 is connected to the negative electrode adapter piece 5 at the second position, when the positive electrode external connection member 3 needs to be connected to the positive electrode adapter piece 2 at the first position, aligning the positive electrode external connection member 3 with the negative electrode external connection member 4 in the circumferential direction of the wound electrode core can find the first position where the positive electrode external connection member 3 is connected to the positive electrode adapter piece 2, thus improving the installation efficiency.

[0058] In other embodiments, the positive electrode adapter piece 2 can be in a shape of a continuously bent broken line, an arc, a straight bar or other irregular shapes.

[0059] In other embodiments, the central angle of the circumferential segment 22 depends on the theoretically designed included angle between the positive electrode tab 13 and the negative electrode tab 14 in the circumferential direction of the wound electrode core. For example, when the theoretically designed included angle is 180°, the central angle subtended by the circumferential segment 22 can be 180°. Of course, the radian of the circumferential segment 22 can also be slightly larger than the theoretically designed included angle between the positive electrode tab 13 and the negative electrode tab 14.

[0060] In other embodiments, the radial segment 21 can be a curved segment or composed of multiple inclined segments.

[0061] In other embodiments, the circumferential segment 22 is composed of multiple connected circular arc segments.

[0062] In other embodiments, the negative electrode adapter piece 5 can be in an arc shape, a shape of a continuously bent broken line or other irregular shapes.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A button battery, characterized in that: The invention comprises a housing (1), a wound electrode core, a positive electrode adapter sheet (2), a positive electrode external connection component (3), a negative electrode adapter sheet (5) and a negative electrode external connection component (4), wherein the wound electrode core is installed in the housing (1), the positive electrode adapter sheet (2) is attached to an axial end surface of the housing (1), and the negative electrode adapter sheet (5) is attached to an axial end surface of the housing (1); One end of the positive electrode adapter (2) is electrically connected to the positive electrode ear (13) of the wound electrode core, and the positive electrode external connection component (3) is connected to the other end of the positive electrode adapter (2) at a first position; One end of the negative electrode adapter (5) is electrically connected to the negative electrode ear (14) of the wound pole core, and the negative electrode external connection component (4) is connected to the other end of the negative electrode adapter (5) at a second position, and the first position and the second position are aligned in the circumferential direction of the wound pole core.

2. The button battery according to claim 1, characterized in that: The positive electrode adapter (2) comprises a radial section (21) and a circumferential section (22), wherein the circumferential section (22) extends along the circumference of the wound pole core, the radial outer end of the radial section (21) is connected to one end of the circumferential section (22), the radial inner end of the radial section (21) is electrically connected to the positive electrode ear (13), and the other end of the circumferential section (22) is connected to the positive electrode external connection component (3) at the first position.

3. The button battery according to claim 2, characterized in that: The theoretical design angle between the positive electrode ear (13) and the negative electrode ear (14) in the circumferential direction of the wound pole core is 90°, and the arc center angle corresponding to the circumferential section (22) ranges from 20° to 180°.

4. The button battery according to claim 2, characterized in that: The radial section (21) comprises an extension section (211) and a fixed section (212) distributed along its extension direction, the radial outer end of the extension section (211) is connected to one end of the circumferential section (22), and the radial inner end of the extension section (211) is connected to the fixed section (212).

5. The button battery according to claim 4, characterized in that: The extension section (211) is in the shape of a straight bar, and the extension section (211) extends along the radial direction of the circumferential section (22). The end of the fixed section (212) is located at the center of the circumferential section (22).

6. The button battery according to claim 4, characterized in that: The fixing section (212) is circular.

7. The button battery according to claim 1, characterized in that: The negative electrode adapter plate (5) is in the shape of a straight strip, and the negative electrode adapter plate (5) extends along the radial direction of the wound pole core.

8. The button battery according to claim 7, characterized in that: The negative electrode adapter (5) comprises a wide segment and a narrow segment distributed along its extension direction, the wide segment is welded to the outer shell (1), and the negative electrode external connection component (4) is connected to the narrow segment.

9. The button cell according to any one of claims 1 to 8, characterized in that: The positive electrode external connection component (3) is welded on the positive electrode conversion plate (2), and the negative electrode external connection component (4) is welded on the negative electrode conversion plate (5).

10. The button cell according to any one of claims 1 to 8, characterized in that: The positive electrode external connection part (3) is a lead, a nickel sheet or an FPC; and / or, The negative electrode external connection component (4) is a lead wire, a nickel sheet or an FPC.

11. The button cell according to any one of claims 1 to 8, characterized in that: The housing (1) comprises a shell (11) and a cover plate (12); the shell (11) has an inner cavity with one end open, the wound pole core is installed in the inner cavity, and the cover plate (12) is sealed and covered on the shell (11); The cover plate (12) comprises a plate body and a pole (121); the plate body is an insulating member; a first through hole penetrating through two side surfaces in a thickness direction of the plate body is provided in the middle of the plate body; the pole (121) is penetrated through the first through hole and protrudes from the plate body; the pole (121) is electrically connected to the positive electrode ear (13); and the positive electrode adapter (2) is attached to the top surface of the pole (121).

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