Battery and electronic device

Abstract

The utility model relates to a battery and electronic equipment, wherein the battery comprises a shell, a battery cell, a tab, a pole and a first insulating glue layer, the pole penetrates through and is fixed on the shell, the battery cell and the tab are connected and are arranged in the shell, the tab is provided with a first surface along the thickness direction of the tab, the first surface comprises a first connection reserved area and a first insulating area, and the first insulating glue layer is arranged in the first connection reserved area. The pole is connected to the first connection reserved area, and the first insulating glue layer adheres to and completely covers the first insulating area. According to the battery provided by the invention, the first insulating glue layer is arranged on the surface, connected with the pole, of the tab, namely, the insulating glue layer is arranged on the outer surface of the bent tab, so that the tab is not in direct contact with the shell even if the tab is deformed and displaced, and the risk of short circuit of the battery is reduced.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery and an electronic device. Background Technology

[0002] With the rapid development of science and technology, various mobile devices have begun to permeate people's lives, gradually becoming indispensable necessities. As the market for electronic products continues to expand, the demand for batteries is increasing. Batteries have advantages such as light weight and good safety performance, and are therefore used in mobile electronic devices such as Bluetooth headsets, mobile phones, laptops, tablets, and cameras, as well as portable power banks.

[0003] A battery typically consists of a casing, terminals, tabs, and cells. The cells are connected to the tabs, and the tabs are connected to the terminals. To prevent short circuits, at least one terminal must be insulated from the casing. However, during use, factors such as vibration or drops can cause the cells to shake, deforming and shifting the tabs, which could lead to contact between the tabs and the casing and cause a short circuit. Utility Model Content

[0004] Therefore, it is necessary to provide a battery that can reduce the risk of battery short circuits.

[0005] This utility model provides a battery comprising a casing, a cell, tabs, terminals, and a first insulating adhesive layer. The terminals are inserted through the casing and are insulated from it. The cell is connected to the tabs and is disposed within the casing. The tabs have a first surface along their thickness direction. The first surface includes a first connection reserved area and a first insulating area. The terminals are connected to the first connection reserved area. The first insulating adhesive layer is adhered to and completely covers the first insulating area.

[0006] The battery according to the embodiments of the present invention has at least the following beneficial effects:

[0007] The surface where the tab connects to the terminal post is provided with a first insulating adhesive layer, that is, the outer surface of the tab after it is bent is provided with an insulating adhesive layer. Therefore, even if the tab is deformed and displaced, it will not directly contact the outer casing, thereby reducing the risk of battery short circuit.

[0008] In one embodiment, the tab is welded to the pole and a first solder mark is formed in the first connection reserved area. The first insulating adhesive layer has a first hollow area. The first solder mark is located in the first hollow area and the gap between the first solder mark and the edge of the first hollow area is 0.1 mm to 1 mm.

[0009] In one embodiment, the tab has a second surface opposite to the first surface, the second surface including a second connection reserved area and a second insulation area, the terminal post is welded to the tab and a second solder mark is formed in the second connection reserved area, the battery further includes a second insulating adhesive layer, and the cell has a third surface facing the terminal post;

[0010] The second insulating adhesive layer adheres to and completely covers the second surface; or,

[0011] The second insulating adhesive layer adheres to and completely covers the third surface; or,

[0012] The second insulating adhesive layer has a second hollow area, the second insulating adhesive adheres to the second surface and extends to the third surface, the second solder mark is located in the second hollow area, the third surface has a third insulating area directly opposite the second hollow area, and the second insulating adhesive completely covers the third insulating area.

[0013] In one embodiment, the second surface is adhered with the second insulating adhesive paper, the first insulating adhesive layer includes a first protrusion protruding from the end of the electrode opposite to the end of the battery cell, and the second insulating adhesive layer includes a second protrusion protruding from the end of the electrode opposite to the end of the battery cell.

[0014] In one embodiment, the first protrusion and the second protrusion are connected to each other.

[0015] In one embodiment, the first insulating adhesive layer and the second insulating adhesive layer are integrally connected.

[0016] In one embodiment, the first protrusion protrudes from the tab along a first direction, and both the first insulating layer and the second insulating layer protrude from the tab along a second direction, which is perpendicular to the first direction.

[0017] In one embodiment, the first protrusion protrudes from the tab along the first direction, and the size of the first protrusion is 0.1 mm to 5 mm in the first direction, and the size of the second protrusion is 0.1 mm to 5 mm.

[0018] In one embodiment, the thickness of the first insulating adhesive layer is 5μm-200μm; and / or, the thickness of the second insulating adhesive layer is 5μm-200μm.

[0019] This utility model provides an electronic device, including a battery.

[0020] The battery according to the embodiments of the present invention has at least the following beneficial effects:

[0021] Electronic devices include batteries. The surfaces where the battery tabs connect to the terminals are provided with a first insulating adhesive layer. That is, the outer surface of the battery tabs after bending is provided with an insulating adhesive layer. Therefore, even if the tabs are deformed and displaced, they will not directly contact the outer casing, thereby reducing the risk of battery short circuit and thus reducing the risk of battery short circuit in electronic devices. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of the battery structure in one embodiment;

[0024] Figure 2 This is a schematic diagram of the battery structure in one embodiment.

[0025] Reference numerals: Battery 10; Casing 20; Insulating shell 21; Cell 30; Tab 40; First insulating layer 41; First hollow area 410; First protrusion 411; Second insulating layer 42; Second hollow area 420; Second protrusion 421; Terminal post 50; First direction P1 Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "installed," "connected," "joined," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] Battery reliability and safety are key technical challenges in the manufacturing and storage of high-capacity power batteries. Battery safety and the protection of the positive and negative terminals are particularly important factors directly affecting battery performance and posing potential safety hazards. Existing batteries consist of an aluminum-plastic film, a bare cell body, tabs, and multiple layers of foil. After the multiple layers of foil and tabs are welded together, they need to be bent multiple times before being placed into the aluminum-plastic film shell for encapsulation. One side of the insulating sheet is welded to the tabs. After the protection board is welded onto the pouch battery, it is folded to the top sealing edge. Compared to conventional structures, the existing multi-tab structure of pouch batteries requires multiple bends after the multi-layer foil is welded to the tabs before being placed into the aluminum-plastic film shell for encapsulation. This results in larger gaps at the battery head, causing a loss of battery energy density. A battery typically consists of a casing, terminals, tabs, and cells. The cells are connected to the tabs, and the tabs are connected to the terminals. To prevent short circuits, at least one terminal must be insulated from the casing. However, during use, factors such as vibration or drops can cause the cells to shake, deforming and shifting the tabs, which could lead to contact between the tabs and the casing and cause a short circuit.

[0030] To solve the above problems, refer to Figure 1 and Figure 2 The battery 10 provided in this application embodiment includes a housing 20, a cell 30, a tab 40, a terminal post 50, and a first insulating adhesive layer 41. The terminal post 50 passes through the housing 20 and is insulated from the housing 20. The cell 30 is connected to the tab 40 and is disposed within the housing 20. The tab 40 has a first surface along its own thickness direction. The first surface includes a first connection reserved area and a first insulating area. The terminal post 50 is connected to the first connection reserved area. The first insulating adhesive layer 41 is pasted on and completely covers the first insulating area.

[0031] Combination Figure 1 and Figure 2 The electrode post 50 passes through and is insulated from the housing 20. For example, an insulating shell 21 is embedded in the housing 20. The insulating shell 21 can be made of PFA (fluoroplastic). The insulating shell 21 has a through groove, and the electrode post 50 is inserted into the through groove, which can play a good sealing role. The electrode post 50 includes an outer electrode post and an inner electrode post. The outer electrode post and the inner electrode post are inserted into the through groove from both sides, and the outer electrode post and the inner electrode post are riveted together. The electrode tab 40 is welded to the inner electrode post. The high energy density of the laser is used to achieve precise welding between the electrode tab 40 and the electrode post 50, ensuring the reliability of the connection and the aesthetics of the weld.

[0032] The battery cell 30 is connected to the tab 40 and is housed within the casing 20. The tab 40 has a first surface along its thickness direction, including a first connection reserved area and a first insulation area. The first connection reserved area is used to connect the terminal post 50. A first insulating adhesive layer 41 can be adhered to the tab 40. Specifically, the first insulating adhesive layer 41 is adhered to and completely covers the first insulation area, ensuring that the tab 40 is in an insulating state while preventing the first insulating adhesive layer 41 from easily detaching from the tab 40. This effectively avoids the problem of insulation failure caused by displacement of the tab 40 due to collision, thereby improving the stability of the battery 10. In some embodiments, the terminal post 50 can be a negative terminal post or a positive terminal post. The thickness of the first insulating adhesive layer 41 can be made very thin to increase the energy density of the battery 10. Based on this, the first insulating adhesive layer 41 is adhered to the tab 40, forming an integrated structure with the tab 40, which can deform and shift synchronously with the tab 40, resulting in higher safety.

[0033] It should be noted that in this embodiment, the electrode tab is, for example, a single-layer electrode tab, or a multi-layer electrode tab composed of multiple sub-electrodes. When the electrode tab 40 is composed of multiple sub-electrodes, only the outermost sub-electrode tab needs to be attached to the first insulating adhesive layer 41, thereby avoiding the first insulating adhesive layer 41 from occupying too much space and improving the energy density of the battery 10 in this embodiment.

[0034] See Figure 1 and Figure 2In some embodiments, the tab 40 has a second surface opposite to the first surface. The second surface includes a second connection reserved area and a second insulation area. The second connection reserved area is used to connect the terminal post 50. A second insulating adhesive layer 42 can be adhered to the tab 40. Specifically, the battery 10 further includes a second insulating adhesive layer 42, and the cell 30 has a third surface facing the terminal post 50. In some embodiments, the second insulating adhesive layer 42 is adhered to and completely covers the second insulation area to ensure that the tab 40 is in an insulating state, thereby preventing short circuits between the tab 40 and the cell 30 due to contact, and thus improving the stability of the battery 10. In some embodiments, the second insulating adhesive layer 42 is adhered to and completely covers the third surface to ensure that the tab 40 and the cell 30 are in an insulating state. In some embodiments, the second insulating adhesive layer 42 has a second hollow area 420, the second insulating adhesive layer 42 is bonded to the second surface and extends to the third surface, the second solder mark is located in the second hollow area, the third surface has a third insulating area directly opposite the second hollow area 420, and the second insulating adhesive layer 42 completely covers the third insulating area, so as to ensure that the tab 40 is in an insulating state, and to prevent the tab 40 and the cell 30 from short-circuiting due to contact, thereby improving the stability of the battery 10.

[0035] In some embodiments, the first connection reserved area and the second connection reserved area are symmetrically arranged, as are the first insulation area and the second insulation area. During welding, the laser irradiates from the second surface and then penetrates to the first surface. This symmetrical arrangement facilitates welding between the pole post 50 and the tab 40. In some embodiments, the size of the first hollow area 410 is larger than the welding area of ​​the solder joint. The tab 40 is welded to the pole post 50, and a first solder mark is formed in the first connection reserved area. In some embodiments, a second solder mark is formed in the second connection reserved area. The first insulating adhesive layer 41 has the first hollow area 410, and the first solder mark is located within the first hollow area 410. The gap between the first solder mark and the edge of the first hollow area 410 is 0.1 mm to 1 mm. Correspondingly, the second insulating adhesive layer 42 has the second hollow area 420, and the second solder mark is located within the second hollow area 420. The gap between the second solder mark and the edge of the second hollow area 420 is 0.1 mm to 1 mm. If the gap between the first solder mark and the edge of the first cutout area 410, or the gap between the second solder mark and the edge of the second cutout area 420, is too close, the first insulating layer 41 or the second insulating layer 42 may be damaged by high temperature, such as deformation or warping, resulting in a reduction in insulation effect. Setting the gap within a suitable range can ensure the insulation effect of the first insulating layer 41 and the second insulating layer 42. In some embodiments, the length of the first hollow area 410 and the second hollow area 420 is 0.1 mm to 1 mm longer than the welding area between the tab 40 and the post 50, and the width of the first hollow area 410 and the second hollow area 420 is 0.1 mm to 1 mm wider than the welding area between the tab 40 and the post 50. It is understood that if the size of the first hollow area 410 and the second hollow area 420 is too large, the insulation effect will be poor. If the size of the first hollow area 410 and the second hollow area 420 is too small, the solder will be imprinted on the insulating tape. Therefore, this solution sets the gap between the first solder mark and the edge of the first hollow area 410, and the gap between the second solder mark and the edge of the second hollow area 420, within a suitable range. This ensures that the solder mark will not be imprinted on the insulating tape due to fluctuations in the welding position during the welding process, thus avoiding the impact of welding position fluctuations on the welding effect. At the same time, the excess size is kept as small as possible to ensure the insulation effect.

[0036] In some embodiments, the tab 40 can be a multi-layer foil tab. The tab 40 is directly welded to the inner electrode post of the housing 20 using methods such as laser welding. The tab 40 can be glued to the middle of the electrode sheet with high-temperature adhesive and then ultrasonically welded, thereby improving the adhesion stability between the tab 40 and the electrode sheet. One end of the tab 40 can be glued to the middle of the electrode sheet with high-temperature adhesive. Since the tab 40 is located in the middle of the electrode sheet, after winding, the tab 40 is located on the outer ring. When the cap is pressed onto the battery housing 20, the bending space of the tab 40 is greatly increased, which can reduce the probability of the tab 40 contacting the inner wall of the battery housing 20 due to excessive length, thereby improving safety. Placing the tab 40 in the middle of the electrode sheet can effectively reduce the internal resistance of the cell 30 and improve the performance of the battery 10.

[0037] In some embodiments, perforated adhesive tape is attached to both sides of the multilayer foil tabs. The thickness of the first insulating adhesive layer 41 and the second insulating adhesive layer 42 is 5 μm to 200 μm. While ensuring the main welding area is protected and preventing short circuits, the welding area can be made as thin as possible to save internal space in the cell 30 and improve the energy density of the battery 10. In some embodiments, the thickness of the first insulating adhesive layer 41 is 5 μm to 200 μm. In some embodiments, the thickness of the second insulating adhesive layer 42 is 5 μm to 200 μm. The thickness of the insulating adhesive layers can be made very thin to improve the energy density of the battery 10.

[0038] In some embodiments, the first insulating layer 41 and the second insulating layer 42 are bonded together at a position beyond the end of the tab 40 away from the battery cell 30. Specifically, the first insulating layer 41 includes a first protrusion 411 protruding from the end of the tab 40 away from the battery cell 30, and the second insulating layer 42 includes a second protrusion 421 protruding from the end of the tab 40 away from the battery cell 30. The first protrusion 411 and the second protrusion 421 enable the end of the tab 40 to be tightly wrapped by the first insulating layer 41 and the second insulating layer 42, thereby improving the insulation effect.

[0039] Battery tapes can generally be classified into the following types according to different requirements: By substrate: PI (polyimide) and PET (polyethylene terephthalate); By adhesive system: silicone pressure-sensitive adhesive series, acrylic series, rubber pressure-sensitive adhesive series, etc.; By application: tab tape, protective film tape, high-temperature tape, termination tape, removable tape, fixing tape, double-sided tape, etc. Battery tab tapes are made by treating various substrates with various primers, adhesives, and release agents to give them different properties to meet various needs. The adhesive effect of tab tape is due to the moisture in the adhesive on the tape surface penetrating into the object being bonded and drying rapidly, making the tape an integral part of the object. Therefore, the micropores on the surface of the object being bonded are very important for tape selection. If the micropores are large and the hygroscopicity is high, a tape with a faster setting speed should be used; otherwise, a tape with a slower setting speed or a higher adhesive content should be used. The adhesive on the surface of the tab 40 tape is typically fully dried before being rolled up. If the tape is too wet, it will be very tight and difficult to unroll during use. A first insulating layer 41 and a second insulating layer 42 are attached to both sides of the tab 40. The first insulating layer 41 adheres to and completely covers the first insulating area, and the second insulating layer 42 adheres to and completely covers the second insulating area. In one embodiment, the first insulating layer 41 and the second insulating layer 42 are integrally connected, facilitating the attachment of the tab 40 and improving operational convenience.

[0040] In some embodiments, the first protrusion 411 protrudes from the tab 40 along a first direction P1, and the first insulating layer 41 and the second insulating layer 42 both protrude from the tab 40 along a second direction P2. The second direction is perpendicular to the first direction P1, which allows the tab 40 to be more tightly covered by the first insulating layer 41 and the second insulating layer 42, further ensuring that the tab 40 is in an insulating state. The first protrusion 411 protrudes from the tab 40 along the first direction P1. In the first direction P1, the size of the first protrusion 411 is 0.1mm to 5mm, and the size of the second protrusion 421 is 0.1mm to 5mm. This ensures that the first insulating layer 41 and the second insulating layer 42 can be firmly adhered to the tab 40 while being as small as possible, so as to save internal space of the battery 10.

[0041] In some embodiments, the tab 40 is connected to one side of the cell 30, and the first insulating layer 41 extends from the tab 40 and is bonded to the cell 30 to better ensure the insulation of the tab 40. The function of applying the first insulating layer 41 and the second insulating layer 42 is to fix the shape of the cell 30 and improve the safety performance of the battery 10. Applying insulating layers to the tab 40 can prevent burrs on the tab 40 from puncturing the separator and short circuits when used improperly, thereby improving the safety performance of the battery 10. The quality of the tape, the position and size of the adhesive application affect the thickness and safety performance of the battery 10. Applying too much adhesive will reduce the effective volume of the battery 10 and reduce the capacity of the battery 10. The high temperature resistance, needle penetration resistance, tensile strength, electrolyte corrosion resistance and electrical insulation of the insulating layer will also affect the safety performance. The insulating layer of the battery tab 40 is usually made of acrylic adhesive and polyimide, while the insulating layer of the termination fixation and other parts is usually made of acrylic adhesive and polypropylene substrate. A good insulating layer needs to have appropriate adhesion and the characteristic of leaving no adhesive residue after peeling.

[0042] The electronic device according to the second aspect of this utility model includes the battery 10 of the first aspect embodiment, which can reduce the risk of short circuit in the electronic device battery. Since this embodiment adopts all the technical features of the battery 10 of the first aspect embodiment, it possesses all the beneficial effects brought by the first aspect embodiment, which will not be repeated here.

[0043] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery, characterized in that, The device includes a housing, a battery cell, tabs, terminals, and a first insulating layer. The terminals pass through the housing and are insulated from it. The battery cell is connected to the tabs and is disposed within the housing. The tabs have a first surface along their thickness direction. The first surface includes a first connection reserved area and a first insulating area. The terminals are connected to the first connection reserved area. The first insulating layer is adhered to and completely covers the first insulating area.

2. The battery according to claim 1, characterized in that, The tab is welded to the pole post and a first weld mark is formed in the first connection reserved area. The first insulating adhesive layer has a first hollow area. The first weld mark is located in the first hollow area and the gap between the first weld mark and the edge of the first hollow area is 0.1 mm to 1 mm.

3. The battery according to claim 1 or 2, characterized in that, The tab has a second surface opposite to the first surface, the second surface includes a second connection reserved area and a second insulation area, the pole is welded to the tab and a second solder mark is formed in the second connection reserved area, the battery also includes a second insulating adhesive layer, and the cell has a third surface facing the pole; The second insulating adhesive layer adheres to and completely covers the second surface; or, The second insulating adhesive layer adheres to and completely covers the third surface; or, The second insulating adhesive layer has a second hollow area, the second insulating adhesive adheres to the second surface and extends to the third surface, the second solder mark is located in the second hollow area, the third surface has a third insulating area directly opposite the second hollow area, and the second insulating adhesive completely covers the third insulating area.

4. The battery according to claim 3, characterized in that, The second surface is bonded with the second insulating adhesive layer. The first insulating adhesive layer includes a first protrusion that protrudes from the end of the electrode away from the end of the battery cell. The second insulating adhesive layer includes a second protrusion that protrudes from the end of the electrode away from the end of the battery cell.

5. The battery according to claim 4, characterized in that, The first protrusion and the second protrusion are connected to each other.

6. The battery according to claim 5, characterized in that, The first insulating layer and the second insulating layer are integrally connected.

7. The battery according to claim 4, characterized in that, The first protrusion protrudes from the electrode tab along a first direction, and both the first insulating adhesive layer and the second insulating adhesive layer protrude from the electrode tab along a second direction, which is perpendicular to the first direction.

8. The battery according to claim 7, characterized in that, The first protrusion protrudes from the tab along the first direction, and the size of the first protrusion is 0.1 mm to 5 mm in the first direction, and the size of the second protrusion is 0.1 mm to 5 mm.

9. The battery according to claim 3, characterized in that, The thickness of the first insulating adhesive layer is 5μm-200μm; and / or, The thickness of the second insulating adhesive layer is 5μm-200μm.

10. An electronic device, characterized in that, The battery includes any one of claims 1 to 9.

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