Button cell

Abstract

The utility model provides a button battery which comprises an upper cover body, a lower cover body, a battery cell body and a tab group, the upper cover body and the lower cover body are closed to form a sealed container, the battery cell body and the tab group are assembled in the sealed container, and a containing space exists between the side edge of the battery cell body and the inner side face of the lower cover body; a positive shell cover is arranged on the upper cover body and serves as a positive output end of the button cell, and a negative shell cover is arranged on the lower cover body and serves as a negative output end of the button cell; the battery cell body is of a laminated structure, the first section of the tab group is electrically connected with the edge of each pole piece on the battery cell body, and the second section of the tab group is accommodated in the accommodating space. The battery cell body is of the laminated structure, so that the thickness of the button battery is reduced, meanwhile, the second section of the tab group is contained in the containing space formed by the side edge of the battery cell body and the inner side face of the lower cover body, it can be ensured that the tab group is not too high, and meanwhile it can be ensured that the upper cover body and the lower cover body are well sealed.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly relates to a button battery. Background Art

[0002] A button cell battery, also known as a coin cell battery, is a small round battery commonly found in watches, small electronic devices, remote controls, toys, etc. With the rapid development of electronic products, consumers' requirements for the structure and performance of button cell batteries are constantly increasing, especially for the thickness of button cell batteries, which is now required to be below 4 mm, and even below 1 mm in some cases.

[0003] Currently, by adopting the lamination process for button cell batteries, the thickness of the button cell battery can be reduced to below 4 mm, and even below 1 mm. However, this will deteriorate the sealing performance between the upper cover and the lower cover of the button cell battery, and also result in poor manufacturability, difficult production and processing, and low yield rate of the button cell battery. Therefore, how to ensure good sealing performance between the upper cover and the lower cover of the button cell battery while keeping the thickness of the button cell battery below 4 mm has become a technical problem to be solved urgently at present. Summary of the Utility Model

[0004] This application provides a button cell battery to solve the problem of ensuring that the thickness of the button cell battery is below 4 mm while maintaining good sealing performance between the upper cover and the lower cover of the button cell battery.

[0005] This application provides a button cell battery, which includes an upper cover, a lower cover, a battery cell body, and an ear group. The upper cover and the lower cover are closed to form a sealed container. The battery cell body and the ear group are assembled in the sealed container. There is a receiving space between the side of the battery cell body and the inner surface of the lower cover. A positive electrode cover is provided on the upper cover, and the positive electrode cover is the positive output terminal of the button cell battery. A negative electrode cover is provided on the lower cover, and the negative electrode cover is the negative output terminal of the button cell battery.

[0006] The battery cell body is of a laminated structure. The first section of the ear group is electrically connected to the edges of each electrode plate on the battery cell body, and the second section of the ear group is received in the receiving space.

[0007] Optionally, the second section of the ear group extends along the horizontal direction of the inner surface of the lower cover, so that the second section of the ear group is in a lying flat structure.

[0008] Optionally, after the second section of the ear group extends along the horizontal direction of the inner surface of the lower cover, it then extends in the vertical direction, so that the second section of the ear group is in an L-shaped structure.

[0009] Optionally, the second section of the tab group extends horizontally along the inner surface of the lower cover body and then turns to extend vertically, and then turns to extend horizontally, so that the second section of the tab group has an inverted U-shaped structure.

[0010] Optionally, the second section of the tab group extends horizontally along the inner surface of the lower cover body and then turns to extend vertically, and then turns to extend horizontally, and then turns down to extend vertically, so that the second section of the tab group has an unconnected mouth-shaped structure.

[0011] Optionally, the cross-section of the battery cell body is a D-shaped structure, and the first sections of the positive tab group and the negative tab group on the tab group are both connected to the vertical surface of the D-shaped structure of the battery cell body.

[0012] Optionally, the upper cover body includes a positive terminal, an insulating sheet and a negative cover plate; the insulating sheet is located between the positive terminal and the negative cover plate.

[0013] Optionally, the positive tab group on the tab group is welded to the positive terminal of the upper cover body, and the negative tab group on the tab group is welded to the negative cover plate of the upper cover body.

[0014] Optionally, a liquid injection hole is provided on the positive terminal or the negative cover plate.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] The present application provides a button battery, which includes an upper cover body, a lower cover body, a battery cell body and a tab group. The upper cover body and the lower cover body are closed to form a sealed container. The battery cell body and the tab group are assembled in the sealed container. There is an accommodation space between the side of the battery cell body and the inner side surface of the lower cover body; a positive electrode cover is provided on the upper cover body, and the positive electrode cover is the positive output terminal of the button battery. A negative electrode cover is provided on the lower cover body, and the negative electrode cover is the negative output terminal of the button battery; the battery cell body is a stacked structure, the first section of the tab group is electrically connected to the edges of the respective electrode plates on the battery cell body, and the second section of the tab group is accommodated in the accommodation space. The battery cell body of the present application is a stacked structure, which can reduce the thickness of the button battery so that the thickness of the button battery is below 4 mm, and even can be below 1 mm. At the same time, the second section of the tab group is accommodated in the accommodation space between the side of the battery cell body and the inner side surface of the lower cover body to ensure that the tab group does not exceed the height, and can also ensure good sealing of the upper cover body and the lower cover body. Description of the Drawings

[0017] Figure 1It is a schematic diagram of the structure of a button battery in the related art of the embodiments of the present application.

[0018] Figure 2 It is a schematic diagram of the structure of a button battery with an extremely high tab group in the related art of the embodiments of the present application.

[0019] Figure 3 It is a schematic diagram of the structure of a sealed container in the button battery of the embodiments of the present application.

[0020] Figure 4 It is a schematic diagram of the structure of the upper cover body in the button battery of the embodiments of the present application.

[0021] Figure 5 It is a schematic diagram of the structure of a button battery in which the second section of the tab group is a lying flat type structure in the embodiments of the present application.

[0022] Figure 6 It is a schematic diagram of the cross-section of the battery cell body being a D-shaped structure in the embodiments of the present application.

[0023] Figure 7 It is a schematic diagram of the structure of a button battery in which the second section of the tab group is an inverted U-shaped structure in the embodiments of the present application.

[0024] Figure 8 It is a schematic diagram of the structure of a button battery in which the second section of the tab group is an unconnected mouth-shaped structure in the embodiments of the present application.

[0025] Figure 9 It is a schematic diagram of the structure of a sealed button battery in the embodiments of the present application.

[0026] Reference numerals:

[0027] 10: Upper cover body; 101: Positive terminal; 1011: Protrusion; 1012: Flat part; 102: Insulating sheet; 103: Negative electrode cover plate;

[0028] 20: Lower cover body;

[0029] 30: Battery cell body; 301: Vertical surface;

[0030] 40: Tab group; 401: Positive tab group; 402: Negative tab group; 401-1: First section of the positive tab group; 401-2: Second section of the positive tab group;

[0031] 50: Sealed container; 501: Accommodating space;

[0032] 60: Liquid injection hole. Detailed implementation manners

[0033] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application. Therefore, the present application is not limited by the specific implementations disclosed below.

[0034] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0035] In the related art, when the thickness of the button battery is below 4 mm or the battery thickness is even thinner, during the assembly of the button battery, it is required that the internal tab group 40 does not exceed the edge of the lower cover body 20 after being welded and bent, as Figure 1 shown. Otherwise, it will affect the sealed welding of the upper cover body 10 and the lower cover body 20 of the button battery, as Figure 2 shown. If the tab group 40 inside the button battery exceeds the edge of the lower cover body 20 after being welded and bent (as Figure 2 shown), it will affect the sealing performance of the upper cover body 10 and the lower cover body 20. At the same time, it may also affect poor phenomena such as open welding, false welding during welding, and leakage of the button battery, further affecting the production of the button battery and resulting in low yield and the reliability of the button battery.

[0036] In view of this, the present application provides a button battery, which includes an upper cover body 10, a lower cover body 20, a battery cell body 30, and a tab group 40. The upper cover body 10 and the lower cover body 20 are closed to form a sealed container 50. The battery cell body 30 and the tab group 40 are assembled inside the sealed container 50. There is an accommodation space 501 between the side of the battery cell body 30 and the inner side surface of the lower cover body 20. A positive electrode cover is provided on the upper cover body, and the positive electrode cover is the positive electrode output terminal of the button battery. A negative electrode cover is provided on the lower cover body, and the negative electrode cover is the negative electrode output terminal of the button battery. The battery cell body 30 is of a stacked structure. The first section of the tab group is electrically connected to the edges of the respective electrode plates on the battery cell body, and the second section of the tab group is accommodated in the accommodation space.

[0037] That is to say, the battery cell body 30 of the present application can reduce the thickness of the button battery to less than 4 mm, or even less than 1 mm, through the stacking structure. At the same time, the first section of the tab group in the button battery is electrically connected to the edges of the respective electrode plates on the battery cell body. The second section of the tab group is accommodated in the accommodation space 501 between the side of the battery cell body and the inner side surface of the lower cover body 20, so that the tab group inside the button battery is lower than the edge height of the lower cover body, and at the same time, the sealing performance of the upper cover body 10 and the lower cover body 20 when they are closed can be ensured.

[0038] Button batteries are divided into primary button batteries and secondary button batteries (rechargeable button batteries). The thickness of primary button batteries is basically less than 4 mm, but primary button batteries cannot be reused and their utilization rate is relatively low. The thickness of secondary button batteries is basically more than 4 mm. Secondary button batteries can be used in long-term cycles, but their thickness is generally too large compared to primary button batteries, which also affects their usage rate. How can the thickness of secondary button batteries be reduced to less than 4 mm or even 1 mm, and at the same time ensure the good sealing performance of the upper cover body and the lower cover body of the button battery when they are closed?

[0039] Next, the structure of the button battery will be described in detail.

[0040] The present application provides a button battery, which includes an upper cover body 10, a lower cover body 20, a battery cell body 30, and a tab group 40. The upper cover body 10 and the lower cover body 20 are closed to form a sealed container 50, and the battery cell body 30 and the tab group 40 are assembled in the sealed container 50. A positive electrode cover is provided on the upper cover body, and the positive electrode cover is the positive electrode output terminal of the button battery. A negative electrode cover is provided on the lower cover body, and the negative electrode cover is the negative electrode output terminal of the button battery.

[0041] Among them, as Figure 4As shown, the upper cover body 10 includes a positive terminal 101, an insulating sheet 102, and a negative cover plate 103; the insulating sheet 102 is located between the positive terminal 101 and the negative cover plate 103. In the embodiment of the present application, the positive terminal 101 includes a convex portion 1011 and a flat portion 1012 connecting the convex portion 1011. The convex portion 1011 is located at the center of the flat portion 1012. The convex portion 1011 presents a frustum-shaped structure. The end with a relatively larger diameter of the frustum is connected to the flat portions 1012 on both sides thereof, and the diameter of the other end in the direction away from the flat portion 1012 gradually decreases. Moreover, insulating sheets 102 are provided on the flat portions 1012 connected to both sides of the convex portion 1011, and a negative cover plate 103 is provided on the insulating sheet 102. It can be understood that the positive terminal 101 and the negative cover plate 103 are completely isolated by the insulating sheet 102 to prevent electrical contact between the upper cover body 10 and the lower cover body 20. Specifically, the material of the insulating sheet is usually selected from materials with high insulation performance and chemical stability, such as polytetrafluoroethylene (PTFE), polyimide (PI), or other high-performance plastics, which can ensure good electrical insulation performance and mechanical strength under the working conditions of the button battery.

[0042] As Figure 3 shown, the lower cover body 20 is a U-shaped structure, and both sides of the U-shaped structure are welded to the negative cover plate 103. That is to say, the button battery is covered by the upper cover body 10 and the lower cover body 20 to form the sealed container 50, and the sealed container 50 is for accommodating the cell body 30 and the ear group 40 (as Figure 5 , 7 shown in FIG. -8), that is, the cell body 30 and the ear group 40 are assembled in the sealed container 50.

[0043] A positive electrode shell cover is provided on the upper cover body, and the positive electrode shell cover is connected to the positive electrode sheet. The positive electrode shell cover serves as the positive electrode output terminal of the button battery; a negative electrode shell cover is provided on the lower cover body, and the negative electrode shell cover is connected to the negative electrode sheet. The negative electrode shell cover serves as the negative electrode output terminal of the button battery and jointly completes the electrical connection between the button battery and the external circuit with the positive electrode shell cover.

[0044] Among them, the battery cell body 40 is a stacked structure, that is, the battery cell body 40 is a stacked structure formed by alternately stacking a positive electrode sheet, a negative electrode sheet and a separator. Specifically, in the embodiment of the present application, the battery cell body adopts a stacking process, that is, the positive electrode sheet, the negative electrode sheet and the separator are alternately laminated to form a multi-layer structure, and then these layers are pressed and assembled in the sealed container 50 provided by the upper cover body 10 and the lower cover body 20 of the button battery. Among them, the positive electrode sheet can be lithium cobalt oxide, ternary, lithium manganese oxide, lithium iron phosphate, etc. or a mixture; lithium cobalt oxide is Lithium Cobalt Oxide, and its chemical formula is LiCoO2; ternary usually refers to the composite oxide of three metal elements of nickel (Ni), cobalt (Co), and manganese (Mn), and its chemical formula is usually expressed as LiNiCoMnO2, and the ratio of Ni, Co, and Mn can be adjusted according to different formulations; lithium manganese oxide is Lithium Manganese Oxide, and its chemical formula is LiMn2O4; lithium iron phosphate is Lithium Iron Phosphate, and its chemical formula is LiFePO4; and the negative electrode sheet is usually graphite; the separator is used to isolate the positive and negative electrodes to prevent short circuit caused by direct contact.

[0045] Specifically, a positive electrode tab extends from the positive electrode sheet on the battery cell body 30, and a negative electrode tab extends from the negative electrode sheet, that is, a positive electrode tab can extend from the edge of each positive electrode sheet, and the positive electrode tabs extending from the edges of each positive electrode sheet are gathered to form a positive electrode tab group. Correspondingly, a negative electrode tab can extend from the edge of each negative electrode sheet, and the negative electrode tabs extending from the edges of each negative electrode sheet are gathered to form a negative electrode tab group.

[0046] The cross-section of the battery cell body 30 is a D-shaped structure, and the first section of the positive electrode tab group and the first section of the negative electrode tab group on the tab group are both connected to the vertical surface 301 of the D-shaped structure of the battery cell body. As Figure 6 shown, the cross-section of the battery cell body 30 is a D-shaped structure, which can increase the area of the battery cell body 30 to improve the internal energy density of the button battery. It can be understood that the positive electrode tab group is formed by tabs extending from the edges of the positive electrode sheets, and the negative electrode tab group is formed by tabs extending from the edges of the negative electrode sheets. When the cross-section of the battery cell body 30 is a D-shaped structure, that is, the first section of the positive electrode tab group is connected to the positive electrode sheet on the vertical surface 301 of the D-shaped structure of the battery cell body 30, and the first section of the negative electrode tab group is connected to the negative electrode sheet on the vertical surface 301 of the D-shaped structure of the battery cell body 30.

[0047] Meanwhile, the second section of the positive tab group is welded to a positive metal strip and electrically connected to the positive terminal through the positive metal strip. The second section of the negative tab group is welded to a negative metal strip and electrically connected to the negative cover plate through the negative metal strip.

[0048] Wherein, the upper cover body 10 and the lower cover body 20 form a sealed container 50. As shown in FIGS. Figure 5 and 7 -8, there is an accommodation space 501 between the side of the battery cell body 30 and the inner side surface of the lower cover body 20. The battery cell body 30 and the tab group 40 are assembled in the sealed container 50, that is, the battery cell body 30 is assembled in the lower cover body 20, so that there is an accommodation space 501 between the side of the battery cell body 30 and the side surface of the lower cover body 20. Moreover, the accommodation space 501 is a part of the sealed container 50, that is, the size of the accommodation space 501 is much smaller than the size of the sealed container 50.

[0049] The first section of the tab group is electrically connected to the edges of the respective electrode plates on the battery cell body, and the second section of the tab group is accommodated in the accommodation space.

[0050] When the thickness of the button battery is relatively thin, for example, when using the welding method of the tab group as shown in Figure 2 FIG., the height of the tab group 40 will exceed the height of the edge of the lower cover body 20, that is, the tab group 40 will be too high, which will further affect the closing between the upper cover body 10 and the lower cover body 20, causing problems such as broken welding and virtual welding in the welding between the upper cover body 10 and the lower cover body 20, and will also cause poor phenomena such as liquid leakage in the button battery, affecting the reliability of the button battery, etc.

[0051] To solve the problem of the excessive height of the tab group 40, in the embodiment of the present application, as shown in FIGS. Figure 5 and Figures 7 - 8 FIG., the second section of the tab group is accommodated in the accommodation space 501. It can be understood that the tab group 40 includes a positive tab group 401 and a negative tab group, and the structures of the positive tab group 401 and the negative tab group are basically the same, that is, the positive tab group 401 includes a first section 401-1 of the positive tab group and a second section 401-2 of the positive tab group, the negative tab group includes a first section of the negative tab group and a second section of the negative tab group. The second section 401-2 of the positive tab group and the second section of the negative tab group can be accommodated in the accommodation space 501, and the height of the tab group 40 will not exceed the height of the edge of the lower cover body 20.

[0052] The second section of the tab group extends along the horizontal direction of the inner surface of the lower cover body, so that the second section of the tab group is in a lying flat structure.

[0053] As shown in Figure 5As shown, the first section 401-1 of the positive tab group and the first section of the negative tab group (not shown) are vertical structures. The positive tabs and negative tabs on the cell body extend out corresponding first sections of the positive tab group 401-1 and the negative tab group at the edges. The flat folding process is to extend the second section 401-2 of the positive tab group and the second section of the negative tab group along the horizontal direction on the inner surface of the lower cover 20, so that the second sections of the tab groups are in a flat structure, that is, the second section 401-2 of the positive tab group and the second section of the negative tab group are in a flat structure. To prevent the tab group 40 from being too high, the flat folding process can be used to extend the second section 401-2 of the positive tab group and the second section of the negative tab group along the horizontal direction, that is, the second section 401-2 of the positive tab group and the second section of the negative tab group are flatly accommodated in the accommodation space. Because the second section 401-2 of the positive tab group and the second section of the negative tab group are extended along the horizontal direction, they will not extend in the vertical direction. In this way, it can be ensured that the tab group 40 will not be too high, and it can further ensure that the lower cover 20 can be better welded, and it can also ensure the effective size and welding tensile force of the tab welding, and will not cause problems such as broken welding and virtual welding between the upper cover 10 and the lower cover 20, so as to ensure the sealing performance of the upper cover 10 and the lower cover 20 when they are closed.

[0054] Among them, the second section of the tab group extends along the horizontal direction on the inner surface of the lower cover and then turns to extend in the vertical direction, and then turns to extend in the horizontal direction, so that the second section of the tab group is in an inverted U-shaped structure.

[0055] As Figure 7As shown, when ensuring that the tab group does not exceed the height limit, it is also possible to increase the area of the battery cell body 30 inside the button battery, so as to reduce the space occupied by the second section of the tab group in the accommodation space 501 and improve the energy density of the button battery. In the embodiment of the present application, the second section of the tab group can be processed by a folding process, that is, through the folding process, the second section 401-2 of the positive tab group and the second section of the negative tab group (not shown) extend along the inner surface of the lower cover body 20. In order to reduce the space occupied by the second section 401-2 of the positive tab group and the second section of the negative tab group when they are flat, the length of the second section 401-2 of the positive tab group and the second section of the negative tab group extending in the horizontal direction of the lower cover body 20 can be reduced. Except for the part extending horizontally along the inner surface of the lower cover body 20, other parts of the second section 401-2 of the positive tab group and the second section of the negative tab group can extend in the vertical direction. However, it should be noted that the height extending in the vertical direction cannot exceed the height of the edge of the lower cover body 20, that is, the height of the second section 401-2 of the positive tab group and the second section of the negative tab group extending in the vertical direction should be lower than the height of the edge of the lower cover body 20 to ensure that the tab group 40 does not exceed the height limit. Subsequently, the remaining second section 401-2 of the positive tab group and the second section of the negative tab group are extended horizontally again. It should be noted that when the second section 401-2 of the positive tab group and the second section of the negative tab group are extended horizontally again, the length in the horizontal direction can accommodate the remaining second section 401-2 of the positive tab group and the second section of the negative tab group.

[0056] By processing the second section of the tab group 40 with a folding process, the second section 401-2 of the positive tab group and the second section of the negative tab group form an inverted U-shaped structure, that is, the opening of the inverted U-shaped structure faces to the right. This structure reduces the extension of the second section 401-2 of the positive tab group and the second section of the negative tab group in the horizontal direction, increases the area of the battery cell body 30 inside the button battery, and improves the energy density of the button battery.

[0057] In addition, the second section of the tab group extends horizontally along the inner surface of the lower cover body and then turns to extend vertically, so that the second section of the tab group forms an L-shaped structure. It should be noted that the length of the tab group extending vertically again cannot exceed the height of the edge of the lower cover body to avoid the tab group exceeding the height limit and affecting the sealing performance of the upper cover body and the lower cover body when they are closed.

[0058] Among them, the second section of the tab group extends horizontally along the inner surface of the lower cover body, then turns to extend vertically, then turns to extend horizontally, and then turns down to extend vertically, so that the second section of the tab group forms an unconnected mouth-shaped structure.

[0059] Such as Figure 8As shown, for the same button cell, compared with the folding process used for the second section of the above tab group, the folding and then bending process used for the second section of the tab group can provide more space for the cell body 30 inside the button cell. For the second section of the tab group, the folding and then bending process is as follows: the second section 401-2 of the positive tab group and the second section of the negative tab group (not shown) first extend along the horizontal direction of the inner surface of the lower cover body 20. It should be noted that at this time, the lengths of the second section 401-2 of the positive tab group and the second section of the negative tab group extending in the horizontal direction are relatively short, so that more space can be provided for the cell body 30. Subsequently, the remaining second section 401-2 of the positive tab group and the second section of the negative tab group are then turned to extend in the vertical direction. At this time, the lengths of the second section 401-2 of the positive tab group and the second section of the negative tab group extending in the vertical direction are relatively long, but they should not exceed the height of the edge of the lower cover body 20 to avoid the tab group 40 being too high and affecting the sealing performance of the upper cover body 10 and the lower cover body 20 when they are closed. When ensuring that the lengths of the second section 401-2 of the positive tab group and the second section of the negative tab group extending in the vertical direction are lower than the height of the edge of the lower cover body 20, the remaining second section 401-2 of the positive tab group and the second section of the negative tab group are then turned to extend in the horizontal direction, and finally turned downward to extend in the vertical direction.

[0060] It can be understood that by adopting the folding and then bending process for the second section of the tab group, the second section 401-2 of the positive tab group and the second section of the negative tab group first extend along the horizontal direction of the lower cover body 20, then extend in the vertical direction, then extend in the horizontal direction, and finally extend downward in the vertical direction, so that the second section 401-2 of the positive tab group and the second section of the negative tab group form an unclosed mouth-shaped structure. To ensure that the tab group 40 is not too high, more space can be provided for the cell body 30, and the energy density of the button cell can be improved.

[0061] Among them, the positive tab group 401 on the tab group is welded to the positive terminal 101 of the upper cover body, and the negative tab group 402 on the tab group is welded to the negative cover plate 103 of the upper cover body. As Figure 9 shown, in the embodiment of the present application, welding the positive tab group 401 to the positive terminal 101 and welding the negative tab group 402 to the negative cover plate 103 can reduce the number of layers of the positive tabs or the negative tabs, and improve the energy density inside the button cell. If the lower cover body needs to be welded first and then the cell body is assembled into the battery case, when welding the positive tabs or the negative tabs, it needs to be bent twice, which is equivalent to the thickness of two layers of positive tabs or negative tabs.

[0062] At the same time, as Figure 9As shown, a liquid injection hole 60 is provided on the positive terminal 101 or the negative cover plate 103. It can be understood that the liquid injection hole 60 can be arranged on the positive terminal 101 together with the positive tab group 401, or the liquid injection hole 60 can be arranged on the negative cover plate 103 together with the negative tab group 402, so that the liquid injection hole 60 and the positive tab group 401 and the negative tab group 402 are kept in the same cover body.

[0063] The button cells are generally sealed batteries, which means that they are designed to be filled with electrolyte once during the manufacturing process and then completely sealed to prevent electrolyte leakage and intrusion of external substances. However, in some maintainable button cell designs, there may be such liquid injection holes, although this is relatively rare. The functions of the liquid injection hole in the button cell mainly include the following:

[0064] Electrolyte filling: During the initial manufacturing process of the button cell, the liquid injection hole is used to fill the electrolyte into the button cell. The electrolyte is the medium for the electrochemical reaction in the battery and is crucial for the performance of the button cell.

[0065] Electrolyte replenishment: In maintainable button cells, the liquid injection hole allows adding or replenishing electrolyte during the use of the button cell to maintain the performance of the button cell. For example, if the electrolyte decreases due to evaporation or consumption, it can be replenished through the liquid injection hole.

[0066] Pressure regulation: The liquid injection hole is sometimes also equipped with a breathable membrane or a breather valve to balance the pressure between the inside and the outside of the battery and prevent the button cell from being damaged due to excessive or too low internal pressure.

[0067] Maintenance and inspection: The presence of the liquid injection hole also facilitates the regular maintenance and inspection of the button cell, such as checking the level of the electrolyte or cleaning the inside.

[0068] The above provides a button cell according to the present application. The core body 30 is a laminated structure, which can reduce the thickness of the button cell to less than 4 mm, and even can reach less than 1 mm. At the same time, the first section of the tab group in the button cell is electrically connected to the edges of the respective electrode plates on the core body, and the second section of the tab group is accommodated in the accommodating space between the side of the core body and the inner side surface of the lower cover body to avoid the tab group being too high, and at the same time, it can also ensure good sealing when the upper cover body and the lower cover body are closed.

[0069] It should be noted that although several structures, components or units for implementing related functions are mentioned in the above detailed description, this division is not mandatory. In fact, according to the specific embodiments of the present application, the features and functions of two or more of the structures, components or units described above can be embodied in one structure, component or unit. Conversely, the features and functions of one structure, component or unit described above can be further divided and embodied by multiple components, structures or units.

[0070] In addition, although the components of the components or devices in the present application and the installation methods between the components are described in a specific order in the drawings, this does not require or imply that the components or devices must be designed according to the specific components or the installation methods between the components, or that all the shown components must be included to achieve the desired results. Additionally or alternatively, some components can be omitted, multiple components can be combined into one component to achieve the corresponding function, and / or one component can be decomposed into multiple components to achieve the corresponding function, etc.

[0071] Although the present application is disclosed above with preferred embodiments, it is not used to limit the present application. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be subject to the scope defined by the claims of the present application.

Claims

1. A button battery, characterized in that: The button battery comprises an upper cover, a lower cover, a battery cell body and a tab group, wherein the upper cover and the lower cover are combined to form a sealed container, wherein the battery cell body and the tab group are assembled in the sealed container, and an accommodation space exists between the side of the battery cell body and the inner side of the lower cover; a positive electrode shell cover is arranged on the upper cover, and the positive electrode shell cover is the positive electrode output terminal of the button battery; a negative electrode shell cover is arranged on the lower cover, and the negative electrode shell cover is the negative electrode output terminal of the button battery; The battery cell body is a laminated structure, the first section of the tab group is electrically connected to the edges of each pole piece on the battery cell body, and the second section of the tab group is accommodated in the accommodation space.

2. The button battery according to claim 1, characterized in that: The second section of the tab group extends along the horizontal direction of the inner surface of the lower cover body, so that the second section of the tab group is a flat-lying structure.

3. The button battery according to claim 2, characterized in that: The second section of the tab group extends in the horizontal direction along the inner surface of the lower cover body and then turns to extend in the vertical direction, so that the second section of the tab group is an L-shaped structure.

4. The button battery according to claim 3, characterized in that: The second section of the tab group extends in the horizontal direction along the inner surface of the lower cover body, then turns to extend in the vertical direction, and then turns to extend in the horizontal direction, so that the second section of the tab group is an inverted U-shaped structure.

5. The button battery according to claim 4, characterized in that: The second section of the tab group extends in the horizontal direction along the inner surface of the lower cover body, then turns to extend in the vertical direction, then turns to extend in the horizontal direction, and then turns downward to extend in the vertical direction, so that the second section of the tab group is an unconnected mouth-shaped structure.

6. The button battery according to claim 1, characterized in that: The cross section of the battery cell body is a D-shaped structure, and the first section of the positive electrode tab group and the first section of the negative electrode tab group on the tab group are both connected to the vertical plane of the D-shaped structure of the battery cell body.

7. The button battery according to claim 1, characterized in that: The upper cover body comprises a positive terminal, an insulating sheet and a negative cover plate; the insulating sheet is located between the positive terminal and the negative cover plate.

8. The button battery according to claim 7, characterized in that: The positive electrode tab group on the tab group is welded to the positive electrode terminal of the upper cover body, and the negative electrode tab group on the tab group is welded to the negative electrode cover plate of the upper cover body.

9. The button battery according to claim 8, characterized in that: The positive electrode terminal or the negative electrode cover plate is provided with a liquid injection hole.

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