A button battery with double-sided positive electrode load
By designing the positive electrode double-sided load structure and inter-embedded structure in the button battery, the existing button battery has been solved, and the existing button battery has been achieved with higher energy density and short service life, while reducing environmental pollution.
Patent Information
- Application Number
- CN202421249512.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-04-01
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The single-sided load design of existing button batteries leads to insufficient energy density, short service life, and waste batteries are highly polluted to the environment.
A button battery structure with double-sided load on the positive electrode is designed. Through the positive and negative electrode mutual embedded structure and the active material layer applied on the double-sided surface, the load capacity of the active material is increased and the battery capacity is increased.
It increases the energy density of button batteries, extends service life, and reduces the pollution of the environment by waste batteries.
Smart Images
Figure CN222705560U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of button cells, and in particular to a button cell with a positive electrode double-sided load. Background Art
[0002] Button batteries, also known as button batteries, are batteries with the appearance and dimensions of a button, usually with a larger diameter and a thinner thickness. Due to their small size, button batteries have been widely used in various microelectronic products and are generally used as backup power sources for various electronic products. Button batteries are divided into two categories: chemical batteries and physical batteries. Among them, chemical batteries are the most commonly used and are mainly composed of an anode, a cathode and its electrolyte.
[0003] At present, the positive electrode inside the existing button battery often adopts a single-sided load, so the capacity of the button battery is limited, and the excessively thick electrode coating layer will also make it difficult for the electrolyte to infiltrate. Therefore, it is necessary to design a suitable battery structure in combination with the structure of the button battery, so as to increase the energy density of the button battery, extend its service life, and reduce the pollution of the discarded battery to the environment. Utility Model Content
[0004] The technical problem to be solved by the present application is to design a suitable battery structure in combination with the structure of a button battery, thereby increasing the energy density of the button battery, extending its service life, and reducing the pollution of discarded batteries to the environment.
[0005] In order to solve the above problems, the present application provides a button battery with a double-sided positive electrode load, comprising a negative electrode shell, a gasket, a positive-negative electrode interlocking structure and a positive electrode shell stacked in sequence; the positive-negative electrode interlocking structure comprises a negative electrode sheet, a positive electrode sheet and a separator, the positive electrode sheet is coated with a first active material layer on both sides, and the negative electrode sheet is coated with a second active material layer on one side; the negative electrode sheets are stacked in a "U" shape and form a first gap, the positive electrode sheets are stacked in a "U" shape and form a second gap, one end of the negative electrode sheet is inserted into the second gap, and one end of the positive electrode sheet is inserted into the first gap to form an interlocking structure; the separator is respectively arranged between the negative electrode sheet and the positive electrode sheet to separate the negative electrode sheet from the positive electrode sheet.
[0006] Preferably, the positive electrode sheet includes a first positive electrode sheet and a first electrode tab connected to each other, the first positive electrode sheet is coated with the first active material layer on both sides, the second gap is formed by overlapping the first positive electrode sheet and the first electrode tab, the first positive electrode sheet extends into the first gap, and the first electrode tab abuts against the inner side of the positive electrode shell.
[0007] Preferably, the negative electrode sheet includes a first negative electrode sheet, a second electrode tab and a second negative electrode sheet connected in sequence, the first gap is formed between the first negative electrode sheet and the second negative electrode sheet, the second negative electrode sheet extends and is inserted into the second gap, and the positive and negative electrode interlocking structure is composed of the first negative electrode sheet, the separator, the first positive electrode sheet, the separator, the second negative electrode sheet, the separator and the first electrode tab stacked in sequence.
[0008] Preferably, the second active material layer is coated on the opposite sides of the first negative electrode sheet and the second negative electrode sheet respectively.
[0009] Preferably, the diameter of the diaphragm is respectively larger than the diameters of the first positive electrode sheet, the first negative electrode sheet, and the second negative electrode sheet.
[0010] Preferably, the first positive electrode sheet, the first negative electrode sheet, and the second negative electrode sheet are all circular, and the diameters of the first positive electrode sheet, the first negative electrode sheet, and the second negative electrode sheet are all 13 mm to 17 mm.
[0011] Preferably, the diameters of the first positive electrode sheet, the first negative electrode sheet, and the second negative electrode sheet are 15 mm.
[0012] Preferably, the length of the first pole lug is greater than the length of the second pole lug.
[0013] Preferably, the first active material layer is lithium cobalt oxide or a high nickel coating.
[0014] Compared with the prior art, the present invention has at least one of the following beneficial technical effects:
[0015] The battery structure designed in the present application includes a negative electrode shell, a gasket, a positive and negative electrode interlocking structure and a positive electrode shell stacked in sequence. The positive and negative electrode interlocking structure is formed by stacking and interlocking the positive electrode sheet and the negative electrode sheet, and the first active material layer is coated on both sides of the positive electrode sheet, and the second active material layer is coated on one side of the negative electrode sheet, thereby increasing the load of the active material layer. The present application designs the positive electrode single-sided load of the original button battery into a positive electrode double-sided load, and perfectly adapts to the structure of the button battery shell through a suitable structural design, thereby increasing the energy density of the button battery, extending its service life, and reducing the pollution of the environment by discarded batteries. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1This is a schematic diagram of the overall structure of a button battery with a double-sided positive electrode load in an embodiment of the present application;
[0018] Figure 2 This is a schematic diagram of the structure of the positive electrode sheet in the embodiment of the present application;
[0019] Figure 3 Schematic diagram of the structure of the negative electrode plate in the embodiment of the present application.
[0020] Explanation of the accompanying drawings: 1. negative electrode shell; 2. gasket; 3. negative electrode plate; 4. positive electrode plate; 5. separator; 6. first gap; 7. second gap; 8. first negative electrode plate; 9. second pole ear; 10. first positive electrode plate; 11. first pole ear; 12. positive electrode shell; 13. first active material layer; 14. second active material layer; 15. second negative electrode plate. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0022] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.
[0023] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.
[0024] It should be further understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0025] Please refer to Figure 1, the embodiment of the present application provides a button cell with a positive electrode double-sided load, the button cell comprising a negative electrode shell 1, a gasket 2, a positive and negative electrode interlocking structure and a positive electrode shell 12 stacked in sequence. Specifically, the positive and negative electrode interlocking structure comprises a negative electrode sheet 3, a positive electrode sheet 4 and a separator 5, the positive electrode sheet 4 is coated with a first active material layer 13 on both sides, and the negative electrode sheet 3 is coated with a second active material layer 14 on one side. The negative electrode sheets 3 are stacked in a "U" shape to form a first gap 6, the positive electrode sheets 4 are stacked in a "U" shape to form a second gap 7, one end of the negative electrode sheet 3 is inserted into the second gap 7, and one end of the positive electrode sheet 4 is inserted into the first gap 6 to form an interlocking structure; the separator 5 is respectively arranged between the negative electrode sheet 3 and the positive electrode sheet 4 to separate the negative electrode sheet 3 from the positive electrode sheet 4 to prevent the direct movement of ions between the two electrodes.
[0026] Here, this embodiment changes the single-sided positive electrode of the original button battery into a double-sided positive electrode, and adapts to the structure of the button battery shell through a suitable structural design. In this way, the loading amount of active materials can be increased, the capacity of the button battery can be improved, thereby increasing the energy density of the button battery, extending its service life, and reducing the pollution of the environment caused by discarded batteries.
[0027] Please refer to Figure 2 In a specific embodiment, the positive electrode sheet 4 includes a first positive electrode sheet 10 and a first pole ear 11 which are fixedly connected, and the fixing method is integrated molding. Among them, the first active material layer 13 is coated on the two opposite sides of the first positive electrode sheet 10, and the second gap 7 is formed by the first positive electrode sheet 10 and the first pole ear 11 overlapping each other, and the first pole ear 11 is bent to form an "L" shape, and one end of the negative electrode sheet 3 extends into the second gap 7. The first positive electrode sheet 10 extends into the first gap 6, and the two opposite sides of the first positive electrode sheet 10 are respectively provided with a diaphragm 5 to separate the first positive electrode sheet 10 from the negative electrode sheet 3. The first pole ear 11 is away from the first positive electrode sheet 10 and abuts against the inner side of the positive electrode shell 12, so as to conduct electricity and make the first positive electrode sheet 10 energized with the outside.
[0028] Please refer to Figure 3 In one specific embodiment, the negative electrode sheet 3 is a symmetrical structure, and in other embodiments, the negative electrode sheet 3 may also be an asymmetrical structure. The fixing method of the negative electrode sheet 3 is one-piece molding, and the negative electrode sheet 3 is made of graphite. The negative electrode sheet 3 includes a first negative electrode sheet 8, a second pole ear 9, and a second negative electrode sheet 15 that are fixedly connected in sequence.
[0029] Among them, the first negative electrode sheet 8 and the second negative electrode sheet 15 are bent along the two ends of the second pole ear 9, the first gap 6 is formed between the first negative electrode sheet 8 and the second negative electrode sheet 15, the first negative electrode sheet 8 and the second negative electrode sheet 15 are coated with the second active material layer 14 on the opposite sides, and the material of the second active material layer 14 is graphite, the first positive electrode sheet 10 extends into the first gap 6; the second negative electrode sheet 15 extends into the second gap 7, and the two opposite sides of the second negative electrode sheet 15 are respectively provided with a separator 5 to separate the second negative electrode sheet 15 from the first positive electrode sheet 10 and the first pole ear 11. In this regard, the positive and negative electrode interlocking structure is the first negative electrode sheet 8, the separator 5, the first positive electrode sheet 10, the separator 5, the second negative electrode sheet 15, the separator 5 and the first pole ear 11 in sequence.
[0030] In a specific embodiment, the material of the first active material layer 13 can be lithium cobalt oxide or high nickel coating. Among them, lithium cobalt oxide has good electrochemical properties, and has the characteristics of high energy density, long cycle life, low self-discharge, etc. High nickel can improve the activity and energy density of the material, and lithium cobalt oxide and high nickel materials can better participate in the charge and discharge reaction of the battery.
[0031] In a specific embodiment, the diaphragm 5 is circular, and in other embodiments, the diaphragm 5 may also be other shapes that meet the structural requirements. The diameter of the diaphragm 5 is respectively larger than the diameter of the first positive electrode sheet 10, the first negative electrode sheet 8, and the second negative electrode sheet 15, so as to separate the first negative electrode sheet 8, the second negative electrode sheet 15 from the first positive electrode sheet 10 and the first pole ear 11. The above-mentioned size limitation can prevent the direct movement of ions between the two poles, so as to prevent the hydrogen ions in the electrolyte from moving to the positive electrode sheet 4 in large quantities to produce hydrogen, thereby improving the performance of the battery.
[0032] In a specific embodiment, the first positive electrode sheet 10, the first negative electrode sheet 8, and the second negative electrode sheet 15 are all circular. In other embodiments, the first positive electrode sheet 10, the first negative electrode sheet 8, and the second negative electrode sheet 15 can also be other shapes that meet structural requirements. Among them, the diameters of the first positive electrode sheet 10, the first negative electrode sheet 8, and the second negative electrode sheet 15 are all 13 mm to 17 mm, for example, 13 mm, 15 mm, or 17 mm, and other sizes that meet usage requirements.
[0033] In this embodiment, the diameters of the first positive electrode sheet 10, the first negative electrode sheet 8, and the second negative electrode sheet 15 are preferably 15 mm, so that the first positive electrode sheet 10, the first negative electrode sheet 8, and the second negative electrode sheet 15 can be in contact with the electrolyte, the coated active material layer, etc. to the greatest extent while satisfying the button battery structure design.
[0034] In a specific embodiment, the first pole ear 11 and the second pole ear 9 are both in the shape of long strips. In other embodiments, the first pole ear 11 and the second pole ear 9 can also be in other shapes that meet the structural requirements. Here, the length of the first pole ear 11 is greater than the length of the second pole ear 9. In this embodiment, the length of the first pole ear 11 is 10 mm and the width is 4 mm, and the length of the second pole ear 9 is 6 mm and the width is 4 mm, so that the first pole ear 11 has enough area to contact with the positive electrode shell 12, thereby improving the stability of the positive electrode plate 4 and the external power supply.
[0035] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A button battery with a positive electrode double-sided load, characterized in that: It includes a negative electrode shell, a gasket, a positive and negative electrode interlocking structure and a positive electrode shell which are stacked in sequence; The positive-negative interlocking structure comprises a negative electrode sheet, a positive electrode sheet and a separator, the positive electrode sheet is coated with a first active material layer on both sides, and the negative electrode sheet is coated with a second active material layer on one side; The negative electrode sheets are stacked in a "U" shape to form a first gap, the positive electrode sheets are stacked in a "U" shape to form a second gap, one end of the negative electrode sheet is inserted into the second gap, and one end of the positive electrode sheet is inserted into the first gap to form an interlocking structure; The separators are respectively arranged between the negative electrode sheet and the positive electrode sheet to separate the negative electrode sheet from the positive electrode sheet.
2. A button cell with a positive electrode double-sided load according to claim 1, characterized in that: The positive electrode sheet includes a first positive electrode sheet and a first electrode tab connected to each other, the first positive electrode sheet is coated with the first active material layer on both sides, the second gap is formed by overlapping the first positive electrode sheet and the first electrode tab, the first positive electrode sheet extends into the first gap, and the first electrode tab abuts against the inner side of the positive electrode shell.
3. A button cell with a positive electrode double-sided load according to claim 2, characterized in that: The negative electrode sheet includes a first negative electrode sheet, a second electrode tab and a second negative electrode sheet connected in sequence, the first gap is formed between the first negative electrode sheet and the second negative electrode sheet, the second negative electrode sheet extends and is inserted into the second gap, and the positive and negative electrode interlocking structure is composed of the first negative electrode sheet, the separator, the first positive electrode sheet, the separator, the second negative electrode sheet, the separator and the first electrode tab stacked in sequence.
4. A button cell with a positive electrode double-sided load according to claim 3, characterized in that: The second active material layer is coated on the opposite sides of the first negative electrode sheet and the second negative electrode sheet.
5. A button cell with a positive electrode double-sided load according to claim 3, characterized in that: The diameter of the diaphragm is respectively larger than the diameters of the first positive electrode sheet, the first negative electrode sheet, and the second negative electrode sheet.
6. A button cell with a positive electrode double-sided load according to claim 3, characterized in that: The first positive electrode sheet, the first negative electrode sheet, and the second negative electrode sheet are all circular, and the diameters of the first positive electrode sheet, the first negative electrode sheet, and the second negative electrode sheet are all 13 mm to 17 mm.
7. A button cell with a positive electrode double-sided load according to claim 6, characterized in that: The diameters of the first positive electrode sheet, the first negative electrode sheet, and the second negative electrode sheet are 15 mm.
8. A button cell with a positive electrode double-sided load according to claim 3, characterized in that: The length of the first electrode tab is greater than the length of the second electrode tab.
9. A button cell with a positive electrode double-sided load according to claim 1, characterized in that: The first active material layer is lithium cobalt oxide or a high nickel coating.