Battery and electric equipment
By reducing the diameter of the electrode and combining the elastic action of the sealing sheet and the insulation layer treatment, the liquid leakage problem caused by the gap between the micro battery electrode and the sealing sheet is solved, improving the sealing and capacity of the battery, and enhancing safety.
Patent Information
- Application Number
- CN202323364749.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-08
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-08
AI Technical Summary
The size of the existing micro-batteries is large, resulting in a gap between the electrode and the sealing plate, which has a risk of liquid leakage, and squeezing the inner space of the shell, affecting the battery capacity.
The diameter of the electrode is 0.05mm~0.2mm, and the ratio of the diameter to the shell is 0.83%~13.4%. The elastic force of the sealing sheet makes the electrodes tightly clamped, and the insulating layer is combined to prevent shorting, optimize the sealing structure and assembly method. .
It effectively avoids battery fluid leakage, improves sealing and battery capacity, and enhances battery safety and prevents short-circuiting of the extreme ears.
Smart Images
Figure CN222168452U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery and electrical equipment. Background Art
[0002] Micro batteries are usually used in small devices, such as micro trackers. The overall size of micro batteries is relatively small, and a semi-sealed structure is generally used to lead out the battery cells, that is, the tabs of the winding core pass through the sealing sheet of the battery shell. The existing tab size is relatively large compared to the overall size of the micro battery, resulting in a gap between the tab and the sealing sheet, and there is a risk of leakage in the micro battery. Moreover, the relatively large tabs will also occupy the limited space inside the shell, resulting in a decrease in the volume of active materials in the shell, affecting the battery capacity. Utility Model Content
[0003] The utility model aims to provide a battery and an electrical device to reduce the size of a pole ear and improve the sealing performance between the pole ear and a sealing sheet.
[0004] To achieve this purpose, the technical solution adopted by the utility model is:
[0005] Batteries, including:
[0006] The outer shell and the winding core are provided with an opening at the top of the outer shell, the winding core is arranged in the outer shell, the diameters of the two pole ears of the winding core are 0.05mm-0.2mm, and the ratio of the diameter of the pole ears to the diameter of the outer shell is 0.83%-13.4%.
[0007] As a preferred solution, the battery further comprises:
[0008] A sealing sheet is sealingly arranged in the opening, and two through holes are formed on the sealing sheet. The two pole tabs pass through the corresponding through holes and out of the sealing sheet respectively.
[0009] As a preferred solution, the length of the tab extending out of the sealing sheet is 15 mm to 30 mm.
[0010] As a preferred solution, the inner diameter of the sealing sheet is 96% to 98.5% of the inner diameter of the outer shell.
[0011] As a preferred solution, the opening edge of the shell is bent inward to form a flange, the flange is pressed against the upper surface of the sealing sheet, and a sealant is provided between the flange and the sealing sheet.
[0012] As a preferred solution, the length of one of the pole lugs is greater than the length of the other pole lug, and at least the outer surface of the longer pole lug has an insulating layer.
[0013] As a preferred solution, the length of one of the pole lugs is 5 mm to 15 mm longer than the length of the other pole lug.
[0014] As a preferred solution, the thickness of the insulating layer is 0.01 mm to 0.04 mm.
[0015] As a preferred solution, the insulating layer is an insulating paint layer or a ceramic coating.
[0016] As a preferred solution, the distance between the two tabs is 1 / 3 to 1 / 2 of the inner diameter of the shell.
[0017] As a preferred solution, the wall thickness of the shell is 0.1 mm to 0.3 mm.
[0018] Batteries, including the above-mentioned batteries.
[0019] The beneficial effects of the utility model are:
[0020] The battery proposed by the utility model includes a shell, a winding core and a sealing sheet. The top of the shell is provided with an opening, and the winding core is provided in the shell. The diameters of the two pole ears of the winding core are 0.05 mm to 0.2 mm, and the ratio of the diameter of the pole ears to the diameter of the shell is 0.83% to 13.4%. By setting the diameter of the pole ears to 0.05 mm to 0.2 mm, and the ratio of the diameter of the pole ears to the diameter of the shell is 0.83% to 13.4%, the diameter of the pole ears is smaller than the diameter of the shell. When the pole ears pass through the through holes of the sealing sheet, the sealing sheet can hold the pole ears tightly under the elastic force of itself, avoiding a gap between the pole ears and the sealing sheet, so that the pole ears and the sealing sheet are well sealed, and the battery is prevented from leaking.
[0021] The electric device provided by the utility model includes the above-mentioned battery, and the diameter of the pole ear is set to 0.05mm-0.2mm, and the ratio of the diameter of the pole ear to the diameter of the shell is 0.83%-13.4%, so that the diameter of the pole ear is smaller than the diameter of the shell. When the pole ear passes through the through hole of the sealing sheet, the sealing sheet can hold the pole ear tightly under the elastic force of the sealing sheet itself, avoiding a gap between the pole ear and the sealing sheet, so that the pole ear and the sealing sheet are well sealed, and leakage of the electric device is avoided. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the structure of a battery provided by an embodiment of the utility model.
[0023] The names and numbers of the components in the figure are as follows:
[0024] 1. Shell; 11. Flanging; 2. Winding core; 21. Tab; 3. Sealing sheet; 31. Through hole. DETAILED DESCRIPTION
[0025] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.
[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, 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 the present invention can be understood according to specific circumstances.
[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0028] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0029] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.
[0030] The overall size of a micro battery is relatively small, and a semi-sealed structure is generally used to lead out the battery cell, that is, the tabs of the core are passed through the sealing sheet of the battery casing. The existing tab size is relatively large compared to the overall size of the micro battery, resulting in a gap between the tab and the sealing sheet, posing a risk of leakage in the micro battery. Moreover, the relatively large tabs will also occupy the limited space inside the casing, resulting in a decrease in the volume of active materials in the casing, affecting the battery capacity. In addition, the tabs are usually not insulated, resulting in the risk of short-circuiting the positive and negative poles of the two tabs during the manufacturing process of the micro battery.
[0031] To solve the above problems, Figure 1 As shown, this embodiment proposes a battery, the battery includes a shell 1, a winding core 2 and a sealing sheet 3, the shell 1 is provided with an opening at the top, the diameter of the shell 1 is 1.5mm-6mm, the winding core 2 is provided in the shell 1, the diameter of the two pole ears 21 of the winding core 2 is 0.05mm-0.2mm, and the ratio of the diameter of the pole ears 21 to the diameter of the shell 1 is 0.83%-13.4%. The sealing sheet 3 is sealed in the opening, and two through holes 31 are provided on the sealing sheet 3, and the two pole ears 21 pass through the sealing sheet 3 from the corresponding through holes 31 respectively. By setting the diameter of the pole ears 21 to 0.05mm-0.2mm, the ratio of the diameter of the pole ears 21 to the diameter of the shell 1 is 0.83%-13.4%, so that the diameter of the pole ears 21 is smaller than the diameter of the shell 1. When the pole ear 21 passes through the through hole 31 of the sealing sheet 3, the sealing sheet 3 can hold the pole ear 21 tightly under the elastic force of the sealing sheet 3 to avoid a gap between the pole ear 21 and the sealing sheet 3, so that the pole ear 21 and the sealing sheet 3 are well sealed to prevent leakage of the battery. At the same time, the outer surface of at least one pole ear 21 has an insulating layer to prevent the two pole ears 21 from directly contacting each other, avoid short circuit of the battery, and improve the safety of the battery.
[0032] It should be noted that the length of one of the pole lugs 21 is greater than the length of the other pole lug 21, and at least the outer surface of the longer pole lug 21 has an insulating layer. In this embodiment, the outer surface of one pole lug 21 has an insulating layer, and the outer surface of the other pole lug 21 does not have an insulating layer. Of course, the outer surfaces of both pole lugs 21 can also have an insulating layer.
[0033] Specifically, the insulating layer of this embodiment is an insulating paint layer or a ceramic coating. The insulating paint layer can be a polyurethane layer, a polyester layer or a polyester imide layer, so that the tab 21 has good insulation performance to prevent the battery from short-circuiting. It should be noted that the thickness of the insulating layer is 0.01mm to 0.04mm, which can ensure the insulation performance of the two tabs 21 and facilitate the subsequent removal of the insulating layer.
[0034] The wall thickness of the shell 1 is 0.1 mm to 0.3 mm. For example, the wall thickness of the shell 1 can be 0.1 mm, 0.2 mm or 0.3 mm, etc. In other embodiments, the wall thickness of the shell 1 can also be set to other values according to the design requirements of the battery, which is not specifically limited here.
[0035] The winding core 2 of this embodiment is a component where electrochemical reactions occur in the battery. The winding core 2 is mainly formed by winding after stacking the pole pieces and the diaphragm. Specifically, the pole pieces are divided into positive pole pieces and negative pole pieces, and the diaphragms are divided into first diaphragms and second diaphragms. The first diaphragm, the negative pole piece, the second diaphragm and the positive pole piece are stacked and wound to form the winding core 2. The parts of the positive pole piece and the negative pole piece with active materials constitute the main body of the winding core 2, and the parts of the positive pole piece and the negative pole piece without active materials are connected with their own pole ears 21 (positive pole ear and negative pole ear). The two pole ears 21 can be located together at one end of the main body or respectively at both ends of the main body. The two pole ears 21 of this embodiment are located at one end of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the pole ears 21 connect the electrode terminals to form a current loop. The first diaphragm is used to insulate and separate the negative pole piece from the shell 1, and the second diaphragm is used to insulate and separate the positive pole piece and the negative pole piece. The tab 21 of this embodiment is cylindrical, the positive tab is made of aluminum, steel or nickel wire, and the negative tab is made of nickel, copper, copper-plated nickel, etc. In other embodiments, the tab 21 may also be a flat sheet structure.
[0036] It should be noted that after the winding core 2 is installed on the outer shell 1, the sealing sheet 3 is placed on the winding core 2. There is a gap between the sealing sheet 3 and the inner wall of the outer shell 1, which not only facilitates the assembly of the sealing sheet 3, but also avoids wrinkles on the sealing sheet 3 after assembly, thereby improving the assembly efficiency and assembly quality of the battery. The sealing sheet 3 of this embodiment has a disc structure, and the inner diameter of the sealing sheet 3 is 96% to 98.5% of the inner diameter of the outer shell 1. In other embodiments, the gap between the sealing sheet 3 and the outer shell 1 can also be flexibly adjusted, which is not specifically limited here.
[0037] Furthermore, if Figure 1 As shown, the opening edge of the housing 1 is bent inward to form a flange 11, which is pressed against the upper surface of the sealing sheet 3, and a sealant is provided between the flange 11 and the sealing sheet 3. The flange 11 can press against the sealing sheet 3 to maintain a good seal between the housing 1 and the sealing sheet 3, and the sealing performance between the housing 1 and the sealing sheet 3 is further improved by applying the sealant.
[0038] The two tabs 21 of this embodiment are respectively the positive tab and the negative tab, and the length of the tab 21 passing through the sealing sheet 3 is 15 mm to 30 mm, so that the battery can be better clamped in the corresponding fixture in the subsequent processing steps. For example, the length of the two tabs 21 passing through the sealing sheet 3 can be 15 mm, 20 mm, 25 mm or 30 mm, etc. In other embodiments, the length of the tab 21 passing through the sealing sheet 3 can also be set to other values according to the design requirements of the battery, which is not specifically limited here.
[0039] It should be noted that after the battery is assembled, the insulating layer of the tab 21 needs to be removed so that the two tabs 21 are respectively connected to the electrode terminals and form a current loop. The length of one of the tabs 21 (the tab 21 with an insulating layer) is 5mm to 15mm longer than the length of the other tab 21 (the tab 21 without an insulating layer), so that the height difference between the two tabs 21 is 5mm to 15mm. For example, the length of the negative tab 21 is 30mm, the length of the positive tab 21 is 20mm, and the length of the insulating layer removed from the tab 21 with an insulating layer is 8mm, so that the exposed parts (conductive parts) of the two tabs 21 will not come into direct contact, avoiding short circuit of the battery and improving the safety of the battery.
[0040] Furthermore, the spacing between the two tabs 21 is 1 / 3 to 1 / 2 of the inner diameter of the housing 1. When the spacing between the two tabs 21 is too small, it is not conducive to the assembly of the tabs 21 and the sealing sheet 3, and it is easy for the two tabs 21 to come into direct contact when the insulating layer is not coated. When the spacing between the two tabs 21 is too large, it is easy for the two tabs 21 to come into contact with the housing 1 when the insulating layer is not coated.
[0041] This embodiment also proposes an electrical device, which includes the above-mentioned battery. By setting the diameter of the pole ear 21 to 0.05mm-0.2mm, the ratio of the diameter of the pole ear 21 to the diameter of the shell 1 is 0.83%-13.4%, so that the diameter of the pole ear 21 is smaller than the diameter of the shell 1. When the pole ear 21 passes through the through hole 31 of the sealing sheet 3, the sealing sheet 3 can hold the pole ear 21 tightly under the elastic force of the sealing sheet 3 itself, avoiding the formation of a gap between the pole ear 21 and the sealing sheet 3, so that the pole ear 21 and the sealing sheet 3 maintain a good seal, avoiding leakage of the electrical device. At the same time, the outer surface of the pole ear 21 has an insulating layer, which can prevent the two pole ears 21 from directly contacting each other, avoid short circuiting of the battery, and improve the safety of the battery.
[0042] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A battery, characterized in that include: An outer shell (1) and a winding core (2), wherein the outer shell (1) is provided with an opening at the top, the winding core (2) is arranged in the outer shell (1), the diameters of the two pole ears (21) of the winding core (2) are 0.05 mm to 0.2 mm, and the ratio of the diameter of the pole ears (21) to the diameter of the outer shell (1) is 0.83% to 13.4%.
2. The battery according to claim 1, characterized in that The battery also includes: A sealing sheet (3) is sealingly arranged in the opening, and two through holes (31) are provided on the sealing sheet (3). The two pole tabs (21) respectively pass through the corresponding through holes (31) to pass through the sealing sheet (3).
3. The battery according to claim 2, characterized in that The length of the pole ear (21) protruding from the sealing sheet (3) is 15 mm to 30 mm.
4. The battery according to claim 2, characterized in that The inner diameter of the sealing sheet (3) is 96% to 98.5% of the inner diameter of the outer shell (1).
5. The battery according to claim 2, characterized in that The opening edge of the housing (1) is bent inward to form a flange (11), the flange (11) is pressed against the upper surface of the sealing sheet (3), and a sealant is provided between the flange (11) and the sealing sheet (3).
6. The battery according to claim 1, characterized in that The length of one of the pole lugs (21) is greater than the length of the other pole lug (21), and at least the outer surface of the pole lug (21) with the longer length has an insulating layer.
7. The battery according to claim 6, characterized in that The length of one of the pole lugs (21) is 5 mm to 15 mm longer than the length of the other pole lug (21).
8. The battery according to claim 6, characterized in that The thickness of the insulating layer is 0.01 mm to 0.04 mm.
9. The battery according to claim 6, characterized in that The insulating layer is an insulating paint layer or a ceramic coating.
10. The battery according to any one of claims 1 to 9, characterized in that The distance between the two pole ears (21) is 1 / 3 to 1 / 2 of the inner diameter of the outer shell (1).
11. The battery according to any one of claims 1 to 9, characterized in that The wall thickness of the shell (1) is 0.1 mm to 0.3 mm.
12. Electrical equipment, characterized in that: A battery comprising the battery according to any one of claims 1 to 11.