Button cell

Abstract

The utility model discloses a button battery which comprises a shell and a cover plate arranged on the upper end face of the shell, a battery cell is arranged in the shell, and the battery cell comprises a plurality of layers of positive plates, a plurality of layers of isolation sheets and a plurality of layers of negative plates which are staggered and overlapped together along the height direction; each layer of positive plate is electrically connected with the cover plate through the corresponding positive tab, or all the positive plates are electrically connected with the cover plate through the same positive tab; and each layer of negative plate is electrically connected with the shell through a negative tab corresponding to the negative plate, or all the negative plates are electrically connected with the shell through the same negative tab. Original sealant is omitted from the button cell, the overall space of the button cell is saved, and the volume energy density of the finished button cell is improved. The negative tab of the button battery can be directly and electrically connected with the shell, so that the internal resistance of the button battery can be reduced, and better multiplying power and cycle performance are achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a button battery. Background Technology

[0002] Button batteries in related technologies typically use sealant to isolate the internal and external spaces of the battery. However, sealant is susceptible to failure and occupies part of the space in the button battery, resulting in lower volumetric energy density and affecting the performance of the button battery. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a button battery.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a button battery is constructed, including a shell and a cover plate installed on the upper end surface of the shell. The shell contains a cell, which includes multiple layers of positive electrode sheets, multiple layers of separator sheets, and multiple layers of negative electrode sheets stacked alternately along the height direction. Each layer of positive electrode sheets is electrically connected to the cover plate through a corresponding positive electrode tab, or all the positive electrode sheets are electrically connected to the cover plate through the same positive electrode tab. Each layer of negative electrode sheets is electrically connected to the shell through a corresponding negative electrode tab, or all the negative electrode sheets are electrically connected to the shell through the same negative electrode tab.

[0005] In some embodiments, the negative electrode tab is welded and fixed to the outer casing.

[0006] In some embodiments, the outer casing includes an upper casing and a lower casing, the end of the negative electrode tab away from the negative electrode sheet is located between the upper casing and the lower casing, and the negative electrode tab is welded and fixed to the upper casing and the lower casing.

[0007] In some embodiments, the negative electrode tab is laser welded to the upper housing and the lower housing.

[0008] In some embodiments, the upper housing and / or the lower housing is a conductive housing.

[0009] In some embodiments, there are multiple negative tabs, and the multiple negative tabs are spaced apart along the circumferential direction of the battery cell.

[0010] In some embodiments, the upper end face of the housing is provided with a through hole, the cover plate is installed on the upper end face of the housing through an insulating member and covers the through hole, and the end of the positive electrode tab away from the positive electrode plate passes through the through hole to be electrically connected to the cover plate.

[0011] In some embodiments, the cover plate includes a body, one end of which is provided with a protrusion located within the through hole, and the end of the positive electrode tab away from the positive electrode plate is electrically connected to the protrusion.

[0012] In some embodiments, the cover plate is an integral structure.

[0013] In some embodiments, the insulating element includes insulating adhesive or insulating sheet.

[0014] The present invention offers the following advantages: It eliminates the need for traditional sealant, saving overall space and increasing the volumetric energy density of the finished button battery. Furthermore, the negative electrode tab can be directly electrically connected to the casing, reducing internal resistance and resulting in better rate capability and cycle performance. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0016] Figure 1 This is one of the structural schematic diagrams of a button battery in some embodiments of this utility model;

[0017] Figure 2 This is the second schematic diagram of the structure of the button battery in some embodiments of this utility model;

[0018] Figure 3 This is a partial structural schematic diagram of a button battery in some embodiments of this utility model. Detailed Implementation

[0019] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0020] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0022] See Figures 1 to 3 This utility model discloses a button battery, including a casing 10 and a cover plate 20 mounted on the upper surface of the casing 10. The casing 10 contains a battery cell 30, which includes multiple layers of positive electrode sheets 31, multiple layers of separator sheets 32, and multiple layers of negative electrode sheets 33 stacked alternately along the height direction. Preferably, the battery cell 30 can be a generally columnar structure, such as a flattened circular columnar structure. The battery cell 30 has, from top to bottom, a layer of negative electrode sheet 33, a layer of separator sheet 32, a layer of positive electrode sheet 31, a layer of negative electrode sheet 33, a layer of separator sheet 32, and a layer of positive electrode sheet 31 stacked sequentially. Alternatively, the battery cell 30 has, from top to bottom, a layer of positive electrode sheet 31, a layer of separator sheet 32, a layer of negative electrode sheet 33, a layer of positive electrode sheet 31, a layer of separator sheet 32, a layer of negative electrode sheet 33, and a layer of positive electrode sheet 31 stacked sequentially. The number of layers of positive electrode sheet 31, separator sheet 32, and negative electrode sheet 33 can be selected according to actual needs.

[0023] Each layer of the positive electrode 31 is electrically connected to the cover plate 20 through its corresponding positive electrode tab 311, or all the positive electrode 31 are electrically connected to the cover plate 20 through the same positive electrode tab 311; each layer of the negative electrode 33 is electrically connected to the outer shell 10 through its corresponding negative electrode tab 331, or all the negative electrode 33 are electrically connected to the outer shell 10 through the same negative electrode tab 331.

[0024] In some embodiments, the button battery can be a lithium-ion button battery, which is generally flattened cylindrical. The height of the button battery can be 0.1-0.9 times its outer diameter, for example, 0.25-0.7 times. Understandably, in other embodiments, the button battery can also be in other shapes such as square columnar or elliptical columnar. A sealed accommodating space is formed inside the housing 10, and the battery cell 30 is disposed in the accommodating space and can be coaxially arranged with the housing 10. The cover plate 20 can be disposed on the upper end surface of the housing 10, without occupying the internal space of the housing 10, ensuring that the battery cell 30 has sufficient volume to improve the volumetric energy density of the button battery.

[0025] In some embodiments, the upper surface of the housing 10 is provided with a through hole 10a. The cover plate 20 is mounted on the upper surface of the housing 10 via an insulating member 40 and covers the through hole 10a. The end of the positive electrode tab 311 away from the positive electrode plate 31 passes through the through hole 10a to be electrically connected to the cover plate 20. The end of the positive electrode tab 311 away from the positive electrode plate 31 passes through the through hole 10a to be welded and fixed to the cover plate 20, which may be done by laser welding.

[0026] In some embodiments, the cover plate 20 includes a body 21, one end of which is provided with a protrusion 22, which is located in the through hole 10a, and the end of the positive electrode tab 311 away from the positive electrode plate 31 is electrically connected to the protrusion 22.

[0027] In some embodiments, the cover plate 20 is a one-piece structure. The cover plate 20 may be made of a conductive metallic material, such as stainless steel, aluminum, iron, or other laser-weldable materials. Preferably, the cover plate 20 is made of aluminum.

[0028] In some embodiments, the insulating element 40 includes insulating adhesive or insulating sheet. When the insulating element 40 uses insulating adhesive, it may be PP adhesive, the main component of which is ethyl cyanoacrylate. When the insulating element 40 uses insulating sheet, the insulating sheet may be made of rubber, TPE, or other insulating materials.

[0029] Since the bonding force between the insulating component 40 and the metal outer shell 10 or cover plate 20 has a certain strength value, when the internal pressure of the button battery exceeds this strength value, the plastic and metal will separate. Therefore, the cover plate 20 can also be used as a safety pressure relief valve, thereby minimizing the safety hazards of the button battery and improving the safety of the button battery.

[0030] In some embodiments, the negative electrode tab 331 is welded and fixed to the housing 10.

[0031] In some embodiments, the outer casing 10 includes an upper casing 11 and a lower casing 12, the end of the negative electrode tab 331 away from the negative electrode plate 33 is located between the upper casing 11 and the lower casing 12, and the negative electrode tab 331 is welded and fixed to the upper casing 11 and the lower casing 12 (e.g., Figure 3 (As shown). The upper housing 11 can be a cylindrical structure or a plate structure, and a through hole 10a can be provided at the center of the upper housing 11. The lower housing 12 can be a cylindrical structure. The outer diameter of the lower housing 12 can be 4.5-40 mm, preferably 6-30 mm. The thickness of the lower housing 12 can be 0.1-1 mm, preferably 0.13-0.35 mm.

[0032] In some embodiments, the negative electrode tab 331 is laser welded to the upper housing 11 and the lower housing 12, so that the negative electrode tab 331, the upper housing 11 and the lower housing 12 are sealed and fixed together.

[0033] In some embodiments, the upper housing 11 and / or the lower housing 12 are conductive housings. For example, the upper housing 11 and / or the lower housing 12 may be made of a laser-weldable material such as stainless steel, aluminum, or iron. Preferably, both the upper housing 11 and the lower housing 12 may be made of aluminum.

[0034] In some embodiments, each layer of the negative electrode 33 is electrically connected to the outer casing 10 via a corresponding negative electrode tab 331, and the number of negative electrode tabs 331 is multiple, with the multiple negative electrode tabs 331 spaced apart along the circumferential direction of the battery cell 30. For example... Figure 2 As shown, the negative electrode tabs 331 are arranged in a fan shape.

[0035] Traditional button cell batteries use sealant to isolate the internal and external spaces of the battery. However, because the electrolyte is highly corrosive, the sealant requires very high quality, making it difficult to achieve reliable sealing performance and potentially leading to leakage and failure. The button cell battery of this application eliminates the need for sealant, solving the electrolyte corrosion problem. Furthermore, its manufacturing process is simpler and its reliability is higher. Moreover, compared to traditional button cells, the button cell battery of this application eliminates the original sealant, saving overall space and increasing the volumetric energy density of the finished button cell. The negative electrode tab 331 of this button cell battery can be directly electrically connected to the casing 10, reducing the internal resistance of the button cell battery and thus providing better rate capability and cycle performance.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A coin cell battery characterized by, The battery includes a shell (10) and a cover plate (20) mounted on the upper end surface of the shell (10), the shell (10) is internally provided with an electric core (30), the electric core (30) includes a plurality of layers of positive electrode sheets (31), a plurality of layers of isolation sheets (32) and a plurality of layers of negative electrode sheets (33) staggered and stacked together in the height direction; each layer of the positive electrode sheets (31) is electrically connected to the cover plate (20) through a corresponding positive electrode lug (311) or all the positive electrode sheets (31) are electrically connected to the cover plate (20) through the same positive electrode lug (311); each layer of the negative electrode sheets (33) is electrically connected to the shell (10) through a corresponding negative electrode lug (331) or all the negative electrode sheets (33) are electrically connected to the shell (10) through the same negative electrode lug (331).

2. The button cell of claim 1, wherein, The negative electrode lug (331) is welded and fixed to the shell (10).

3. The button cell of claim 1, wherein, The shell (10) includes an upper shell (11) and a lower shell (12), the end of the negative electrode lug (331) away from the negative electrode sheet (33) is located between the upper shell (11) and the lower shell (12), and the negative electrode lug (331) is welded and fixed to the upper shell (11) and the lower shell (12).

4. The button cell of claim 3, wherein, The negative electrode lug (331) is laser welded and fixed to the upper shell (11) and the lower shell (12).

5. The button cell of claim 3, wherein, The upper shell (11) and / or the lower shell (12) is a conductive shell.

6. The button cell of claim 1, wherein, The number of the negative electrode lug (331) is multiple, and multiple negative electrode lugs (331) are arranged at intervals along the circumferential direction of the electric core (30).

7. The button cell of claim 1, wherein, The upper end surface of the shell (10) is provided with a through hole (10a), the cover plate (20) is mounted on the upper end surface of the shell (10) and covers the through hole (10a) through an insulating piece (40), and the end of the positive electrode lug (311) away from the positive electrode sheet (31) penetrates through the through hole (10a) to be electrically connected to the cover plate (20).

8. The button cell battery of claim 7, wherein, The cover plate (20) includes a main body (21), one end of the main body (21) is provided with a protruding part (22), the protruding part (22) is located in the through hole (10a), and the end of the positive electrode lug (311) away from the positive electrode sheet (31) is electrically connected to the protruding part (22).

9. The button cell battery of claim 7, wherein, The cover plate (20) is an integral structure.

10. The button cell battery of claim 7, wherein, The insulating piece (40) includes insulating glue or an insulating sheet.

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