Button cell roll core structure and cell

Abstract

The utility model relates to a button cell roll core structure and a cell. The button cell roll core structure comprises a first pole piece, a second pole piece and a diaphragm, the first pole piece comprises a main body and an extension part, the diaphragm is arranged between the main body and the second pole piece, the main body, the diaphragm and the second pole piece are sequentially stacked and wound, and the extension part is arranged between the main body and the second pole piece. One end of the main body far away from the winding center is aligned with one end of the second positive plate far away from the winding center; the extension part comprises an extension section and a fold-back section, the extension section is connected with one end, far away from the winding center, of the main body, the extension direction of the extension section is the same as that of the main body, one end, far away from the main body, of the extension section is connected with the fold-back section, the extension direction of the fold-back section is opposite to that of the extension section, and the fold-back section is an empty foil. According to the scheme provided by the invention, the situation that the battery cell ED is lost due to the fact that the size of the button cell roll core structure is influenced can be avoided, the inflection section is an empty foil and does not contain a pole material area, and meanwhile pole piece material falling is avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a button-type battery core structure and a battery. Background Art

[0002] During the production of button-type batteries, because the negative electrode sheet needs to wrap the positive electrode, the outermost negative electrode at the end of the winding core is often longer than the outermost positive electrode. The directional current will generate a magnetic field, and the currents in the parts of the positive and negative electrodes that are equal in length are opposite, and the magnetic fields can cancel each other out. However, the outermost negative electrode is longer than the outermost positive electrode, and the magnetic field generated by the part of the negative electrode that is longer than the positive electrode cannot be canceled out, which will affect the sound quality of the terminal product.

[0003] In the prior art, although there are methods of making the magnetic field generated by the protruding portion of the negative electrode self-cancelling by changing the protruding portion of the negative electrode, such as the battery roll core, battery and electronic device disclosed in CN116470156A, since the length of the protruding portion of the negative electrode needs to be increased and the protruding portion of the negative electrode is not wound around the positive electrode, the size of the entire roll core becomes larger, which makes it easy to lose the battery cell ED, and the protruding portion of the negative electrode contains a negative electrode material area, and increasing the negative electrode sheet increases the risk of the negative electrode sheet falling off. Utility Model Content

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a button-type battery core structure that can avoid powder loss of the electrode.

[0005] According to a first aspect of the present application, there is provided a button-type battery core structure, comprising a first pole piece, a second pole piece and a diaphragm, wherein the first pole piece comprises a main body and an extension portion, the diaphragm is arranged between the main body and the second pole piece, the main body, the diaphragm and the second pole piece are stacked and wound in sequence, and an end of the main body away from the winding center is aligned with an end of the second pole piece away from the winding center; the extension portion comprises an extension section and a folded section, the extension section is connected to an end of the main body away from the winding center, the extension direction of the extension section is the same as the extension direction of the main body, the end of the extension section away from the main body is connected to the folded section, the extension direction of the folded section is opposite to the extension direction of the extension section, and the folded section is a hollow foil.

[0006] Furthermore, the button battery roll core structure also includes adhesive tape, and the adhesive tape is located between the extended section and the folded section, and the extended section and the folded section are separated by the adhesive tape.

[0007] Furthermore, the arc center angle of the return segment is 0 to 120°.

[0008] Furthermore, the arc center angle of the extension section is 0 to 120°.

[0009] Furthermore, an end of the second pole piece away from the winding center and the tail of the folded segment are in the same radial direction of the winding center.

[0010] Furthermore, the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.

[0011] Furthermore, the first pole piece is a positive pole piece, and the second pole piece is a negative pole piece.

[0012] Furthermore, the folded section is located on a side of the extended section away from the winding center.

[0013] Furthermore, a side of the extension section facing the main body is separated from the main body.

[0014] A battery comprising a housing, a terminal and the button-type battery core structure, wherein the button-type battery core structure is located in the housing, and the terminal is mounted on the housing;

[0015] The first pole piece is electrically connected to the housing, and the second pole piece is electrically connected to the terminal; or, the second pole piece is electrically connected to the housing, and the first pole piece is electrically connected to the terminal.

[0016] The technical solution provided by the present application may include the following beneficial effects: the folded section folds back from the extended section in the opposite direction, so that the extension direction of the folded section is opposite to the extension direction of the extended section. Since the folded section folds back from the extended section in the opposite direction, the occupied space of the button-type battery core structure is hardly increased, thereby avoiding affecting the size of the button-type battery core structure and causing loss of battery cell ED, wherein the folded section is an empty foil, the folded section does not contain a pole material area, and at the same time avoids pole sheet material falling.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0019] Figure 1 is a structural schematic diagram of a button-type battery roll core structure shown in an embodiment of the present application;

[0020] Figure 2 It is a schematic diagram of the structure of the battery shown in the embodiment of the present application.

[0021] Reference numerals: first pole piece 1; main body 11; extension section 12; folded section 13; second pole piece 2; adhesive tape 3; steel shell 4; cover plate 5; terminal 6; insulating adhesive tape 7; composite adhesive layer 8. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In response to the above problems, an embodiment of the present application provides a button-type battery core structure that can prevent electrode powder from falling off.

[0027] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0028] Figure 1 It is a structural schematic diagram of a button-type battery roll core structure shown in an embodiment of the present application.

[0029] See also Figure 1 The button-type battery core structure includes a first pole piece 1, a second pole piece 2 and a diaphragm, one of the first pole piece 1 and the second pole piece 2 is a positive pole piece, and the other is a negative pole piece. The first pole piece 1 includes a main body 11 and an extension portion, and the diaphragm is arranged between the main body 11 and the second pole piece 2. The diaphragm can prevent a short circuit between the main body 11 and the second pole piece 2. The main body 11, the diaphragm and the second pole piece 2 are stacked in sequence, and the main body 11, the diaphragm and the second pole piece 2 are wound into a cylindrical shape. The end of the main body 11 away from the winding center is aligned with the end of the second pole piece 2 away from the winding center, so that the end of the main body 11 away from the winding center and the end of the second positive pole piece away from the winding center are in the same radial direction of the winding center. The extension portion includes an extension section 12 and a folded section 13, the extension section 12 is connected to one end of the main body 11 away from the winding center, the extension direction of the extension section 12 is the same as the extension direction of the main body 11, and the extension section 12 is integrally formed with the main body 11, the end of the extension section 12 away from the main body 11 is connected to the folded section 13, the folded section 13 folds back from the extension section 12 in the opposite direction, so that the extension direction of the folded section 13 is opposite to the extension direction of the extension section 12, because the folded section 13 is folded back from the extension section 12 in the opposite direction, it will hardly increase the occupied space of the button battery core structure, avoid affecting the size of the button battery core structure and causing the loss of the battery cell ED, wherein the folded section 13 is an empty foil, the folded section 13 does not contain a pole material area, and at the same time avoids pole sheet material falling.

[0030] The button battery roll core structure also includes adhesive tape 3, which is located between the extended section 12 and the folded section 13. The extended section 12 and the folded section 13 are separated by the adhesive tape 3. The adhesive tape 3 has an insulating effect, which can prevent the extended section 12 and the folded section 13 from short-circuiting, ensuring that when power is turned on, the current direction in the extended section 12 is opposite to the current direction in the folded section 13, and the magnetic field direction generated by the extended section 12 is opposite to the magnetic field direction generated by the folded section 13. The magnetic field direction generated by the extended section 12 and the magnetic field direction generated by the folded section 13 can offset each other, and the folded section 13 can be close to the extended section 12 to reduce the space occupied by the first pole piece 1.

[0031] The extension direction of the return segment 13 is arc-shaped, and the arc center angle of the return segment 13 is 0 to 120°. Preferably, the arc center angle of the return segment 13 is 90°. The extension direction of the extension segment 12 is arc-shaped, and the arc center angle of the extension segment 12 is 0 to 120°. Preferably, the arc center angle of the extension segment 12 is 90°. In order to improve the effect of magnetic field cancellation, the end of the second pole piece 2 away from the winding center and the tail of the return segment 13 are in the same radial direction of the winding center, that is, the length of the extension segment 12 is the same as the length of the return segment 13, and the magnetic field generated by the current passing through the extension segment 12 can be completely cancelled by the magnetic field generated by the current passing through the return segment 13.

[0032] In this embodiment, the first pole piece 1 is a negative pole piece, the second pole piece 2 is a positive pole piece, the length of the first pole piece 1 is greater than the length of the second pole piece 2, and the first pole piece 1 can wrap the positive pole, wherein the extra magnetic field of the extension section 12 that is not offset by the second pole piece 2 can be offset by the magnetic field generated by the return section 13. In other embodiments, the first pole piece 1 can be a positive pole piece, and the second pole piece 2 can be a negative pole piece.

[0033] The folded section 13 is located on the side of the extended section 12 away from the winding center, that is, the folded section 13 folds back from the extended section 12 in a direction away from the winding center, and the folded section 13 does not contact the main body 11, thereby avoiding a short circuit between the folded section 13 and the main body 11, and there is no need to use insulating stickers to separate the folded section 13 and the main body 11, thereby saving costs.

[0034] The side of the extension section 12 facing the main body 11 is separated from the main body 11 to prevent the side of the extension section 12 facing the main body 11 from contacting the main body 11 and causing a short circuit. The side of the extension section 12 facing the main body 11 and the main body 11 can be separated by an insulating sticker, or the side of the extension section 12 facing the main body 11 can be directly distanced from the main body 11 so that the side of the extension section 12 facing the main body 11 cannot directly conduct electricity with the main body 11.

[0035] Figure 2 It is a schematic diagram of the structure of the battery shown in the embodiment of the present application.

[0036] Corresponding to the aforementioned application function implementation device embodiment, the present application also provides a battery, see Figure 2 The battery includes a shell, a terminal 6 and a button-type battery core structure. The shell includes a grooved steel shell 4 and a cover plate 5. The button-type battery core structure is located in the steel shell 4. The electrolyte is injected into the steel shell 4. The cover plate 5 covers the steel shell 4. An insulating adhesive 7 is provided on the side of the cover plate 5 facing the button-type battery core structure. A composite adhesive layer 8 is provided on the side of the cover plate 5 facing away from the button-type battery core structure. The terminal 6 is fixed to the cover plate 5 through the composite adhesive layer 8. When the first pole piece 1 is a negative pole piece and the second pole piece 2 is a positive pole piece, the first pole piece 1 is fixed to the inner surface of the shell and electrically connected to the shell, and the second pole piece 2 is fixed to the terminal 6 and electrically connected to the terminal 6. When the first pole piece 1 is a positive pole piece and the second pole piece 2 is a negative pole piece, the second pole piece 2 is fixed to the inner surface of the shell and electrically connected to the shell, and the first pole piece 1 is fixed to the terminal 6 and electrically connected to the terminal 6.

[0037] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0038] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A button battery core structure, characterized in that: It includes a first pole piece, a second pole piece and a diaphragm, the first pole piece includes a main body and an extension part, the diaphragm is arranged between the main body and the second pole piece, the main body, the diaphragm and the second pole piece are stacked and wound in sequence, and the end of the main body away from the winding center is aligned with the end of the second pole piece away from the winding center; the extension part includes an extension section and a folded section, the extension section is connected to the end of the main body away from the winding center, the extension direction of the extension section is the same as the extension direction of the main body, the end of the extension section away from the main body is connected to the folded section, the extension direction of the folded section is opposite to the extension direction of the extension section, and the folded section is a hollow foil.

2. The button cell core structure according to claim 1, characterized in that: It also includes adhesive tape, which is located between the extended section and the folded section, and the extended section and the folded section are separated by the adhesive tape.

3. The button cell core structure according to claim 1, characterized in that: The arc center angle of the return section is 0-120°.

4. The button cell core structure according to claim 1, characterized in that: The arc center angle of the extended section is 0-120°.

5. The button cell core structure according to claim 1, characterized in that: An end of the second pole piece away from the winding center and the tail of the folded segment are in the same radial direction of the winding center.

6. The button cell core structure according to claim 1, characterized in that: The first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.

7. The button cell core structure according to claim 1, characterized in that: The first pole piece is a positive pole piece, and the second pole piece is a negative pole piece.

8. The button cell core structure according to claim 1, characterized in that: The folded section is located at a side of the extended section away from the winding center.

9. The button cell core structure according to claim 1, characterized in that: The extension section is spaced apart from the main body on a side facing the main body.

10. A battery, characterized in that: It comprises a shell, a terminal and the button-type battery core structure according to any one of claims 1 to 9, wherein the button-type battery core structure is located in the shell, and the terminal is installed on the shell; The first pole piece is electrically connected to the housing, and the second pole piece is electrically connected to the terminal; or, the second pole piece is electrically connected to the housing, and the first pole piece is electrically connected to the terminal.

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