Soft package button cell, earphone and electronic equipment

Abstract

The invention provides a soft package button battery, an earphone and electronic equipment. The soft package button battery comprises a battery cell; the upper aluminum-plastic film and the lower aluminum-plastic film wrap the battery cell, the peripheries of the upper aluminum-plastic film and the lower aluminum-plastic film are attached together to form a sealing edge, the sealing edge is folded on the outer side wall of the upper aluminum-plastic film, the battery cell comprises a first part and a second part, the first part is the part, corresponding to the sealing edge, of the battery cell, and the second part is the part, corresponding to the sealing edge, of the battery cell. The second part is the part, except the first part, of the battery cell; and the protection structure surrounds the periphery of the second part, and the protection structure is located between the lower aluminum plastic film and the second part, or at least part of the lower aluminum plastic film is located between the protection structure and the second part. The soft package button battery can effectively avoid deformation and damage of the battery cell, and is beneficial to improving the safety of the battery, the earphone and the electronic equipment.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a soft-package button battery, earphones and electronic equipment. Background Art

[0002] Soft-pack button batteries refer to small batteries wrapped with aluminum-plastic film, which are mainly used in fields such as Bluetooth headsets. Compared with steel-shell button batteries, soft-pack button batteries have the advantages of low cost and simple process. However, since the battery cell is only wrapped with a layer of aluminum-plastic film, the overall structural strength is relatively low. Figure 1 As shown, when the soft-pack button battery is installed in the battery compartment, it may be squeezed or collide with the battery compartment, causing deformation and damage, affecting the safety of the battery. Summary of the invention

[0003] The present application provides a soft-pack button battery, earphones and electronic equipment, which can effectively prevent deformation and damage of the battery cell, and is beneficial to improving the safety of the battery, earphones and electronic equipment.

[0004] In a first aspect, a soft-pack button battery is provided, comprising: a battery cell; an upper aluminum-plastic film and a lower aluminum-plastic film, wherein the upper aluminum-plastic film and the lower aluminum-plastic film cover the battery cell, wherein the peripheries of the upper aluminum-plastic film and the lower aluminum-plastic film are bonded together to form an edge seal, wherein the edge seal is folded over the outer side wall of the upper aluminum-plastic film, wherein the battery cell comprises a first part and a second part, wherein the first part is a part of the battery cell corresponding to the edge seal, and the second part is a part of the battery cell other than the first part; and a protective structure, wherein the protective structure surrounds the periphery of the second part, wherein the protective structure is located between the lower aluminum-plastic film and the second part, or wherein at least a part of the lower aluminum-plastic film is located between the protective structure and the second part.

[0005] In the embodiment of the present application, the protective structure surrounds the outer circumference of the portion of the battery cell that is not sealed, which can provide a buffer for the battery cell without increasing the size specifications of the battery, prevent the battery from being deformed by squeezing and collision, and help improve the safety of the battery.

[0006] In combination with the first aspect, in some implementations of the first aspect, the protective structure is a ring structure.

[0007] In the embodiment of the present application, the ring structure can fully protect the battery cell, which is beneficial to improving the safety of the battery.

[0008] In combination with the first aspect, in some implementations of the first aspect, the annular structure has an opening.

[0009] In the embodiment of the present application, the annular structure may have an opening, that is, the annular structure may be disconnected at a certain point. The annular structure may be expanded and then assembled to the second part of the battery cell to prevent scratches on the outer surface of the aluminum-plastic film. On the other hand, the battery may expand due to heat during operation, and the annular structure with an opening can provide a margin to avoid deformation of the battery, which is conducive to improving the safety of the battery.

[0010] In combination with the first aspect, in certain implementations of the first aspect, a thickness of the protective structure is less than or equal to a thickness from an outer side wall of the edge seal to an outer side wall of the upper aluminum-plastic film.

[0011] In the embodiment of the present application, the protective structure can provide a buffer for the battery cell without increasing the size specifications of the battery, thereby preventing the battery from being deformed by squeezing and collision, which is beneficial to improving the safety of the battery.

[0012] In combination with the first aspect, in some implementations of the first aspect, the battery core is a winding core, and the upper aluminum-plastic film and the lower aluminum-plastic film are arranged opposite to each other along the axial direction of the winding core.

[0013] In combination with the first aspect, in some implementations of the first aspect, the material of the protective structure is plastic, silicone or foam.

[0014] In combination with the first aspect, in some implementations of the first aspect, it also includes: a pole ear, one end of which is connected to the positive electrode sheet or the negative electrode sheet of the battery cell, and the other end of which extends through the edge seal to the external space.

[0015] In combination with the first aspect, in certain implementations of the first aspect, a portion of the tab located at the edge seal is coated with tab glue.

[0016] In the embodiment of the present application, the tab glue can improve the sealing of the tab at the edge sealing, which is beneficial to improving the safety of the battery.

[0017] In a second aspect, an earphone is provided, characterized in that the earphone comprises a soft-pack button battery as described in any one of claims 1-8.

[0018] According to a third aspect, an electronic device is provided, wherein the earphone comprises a soft-pack button battery as described in any one of claims 1 to 8. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the installation process of the soft-pack button battery.

[0020] Figure 2 It is a schematic diagram of a longitudinal section of a soft-pack button battery provided in an embodiment of the present application.

[0021] Figure 3It is a schematic diagram of the structure of a soft-pack button battery provided in an embodiment of the present application.

[0022] Figure 4 It is a schematic diagram of a cross section of a soft-pack button battery provided in an embodiment of the present application.

[0023] Figure 5 It is a schematic diagram of a longitudinal section of another soft-pack button battery provided in an embodiment of the present application.

[0024] Figure 6 It is a schematic diagram of the structure of another soft-pack button battery provided in an embodiment of the present application.

[0025] Figure 7 It is a simulation schematic diagram of the installation process of the soft-pack button battery provided in the embodiment of the present application. DETAILED DESCRIPTION

[0026] The terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" refer to one, two or more. The term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0027] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0028] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0029] Aluminum-plastic film is a film product with both an aluminum layer and a plastic film layer. It is usually a multilayer film consisting of an outer nylon layer (ON), an adhesive, an intermediate aluminum foil (Al), an adhesive, and an inner heat-sealing layer (CPP). Aluminum-plastic film is mainly used for the packaging of soft-pack batteries, mainly to protect the internal battery materials and isolate the internal battery cells from the outside world. Aluminum-plastic film generally has the following characteristics: (1) It has extremely high barrier properties; (2) It has good heat-sealing properties; (3) The material is resistant to corrosion by electrolytes and strong acids; (4) It has good ductility, flexibility, and mechanical strength.

[0030] Soft-pack button batteries are small batteries wrapped with aluminum-plastic film, and are mainly used in portable small electronic devices, such as Bluetooth headsets, hearing aids, etc. Soft-pack button batteries have the advantages of low cost and simple process compared to steel-shell button batteries. However, since the battery cell is only wrapped with a layer of aluminum-plastic film, the overall structural strength is low. Figure 1 As shown, when installing a soft-pack button battery into a battery compartment, the battery cell may often be squeezed or collide with the battery compartment, causing deformation and damage, affecting the safety of the battery.

[0031] The embodiment of the present application provides a soft-pack button battery, which can effectively avoid the problem of battery cell deformation and damage caused by squeezing or collision, and is beneficial to improving the safety performance of the battery.

[0032] Figure 2 Schematic diagram of a longitudinal section of a soft-pack button battery 100 provided in an embodiment of the present application. Figure 3 It is a schematic diagram of the structure of a soft-pack button battery 100 provided in an embodiment of the present application.

[0033] like Figure 2 and Figure 3 As shown, the soft-pack button battery 100 may include a battery cell 110 , a soft-pack shell 120 , and a protective structure 140 .

[0034] The battery cell 110 may be a wound structure or a laminated structure. Figure 3 The winding structure is that the positive and negative electrodes and the separator of the battery cell are rolled together. The battery cell with the winding structure can also be called a wound core; the stacked structure is that the positive and negative electrodes and the separator are stacked together alternately. The battery cell with the stacked structure can also be called a stacked core.

[0035] The following description will be made by taking the battery cell 110 as a winding core as an example.

[0036] The soft package shell 120 may include an upper aluminum-plastic film 121 and a lower aluminum-plastic film 122, and a cavity for accommodating the battery cell 110 may be formed between the upper aluminum-plastic film 121 and the lower aluminum-plastic film 122, that is, the battery cell 110 is located in the cavity formed between the upper aluminum-plastic film 121 and the lower aluminum-plastic film 122. For the winding core, the upper aluminum-plastic film 121 and the lower aluminum-plastic film 122 may be arranged opposite to each other along the axial direction of the winding core.

[0037] The packaging process of a general soft-pack button battery may include the following steps. A groove for accommodating the battery cell 110 is punched out in advance on the upper aluminum-plastic film 121 and the lower aluminum-plastic film 122. Then, the battery cell 110 is placed in the groove of the lower aluminum-plastic film 122, and the upper aluminum-plastic film 121 is covered on the battery cell 110, and the periphery of the upper aluminum-plastic film 121 and the lower aluminum-plastic film 122 is punched to fit the two together. After punching, the portion where the periphery of the upper aluminum-plastic film 121 and the lower aluminum-plastic film 122 fit together will form an embossed pattern with wrinkles, i.e., an edge seal 130. Finally, the edge seal 130 is folded upward so that the edge seal 130 fits on the outer side wall of the upper aluminum-plastic film 121.

[0038] It should be noted that, due to the presence of the edge seal 130, the diameter of the groove on the lower aluminum-plastic film 122 is usually larger than the groove on the upper aluminum-plastic film 121, so there may be a gap between the inner side wall of the lower aluminum-plastic film 122 and the battery cell 110, and the lower aluminum-plastic film 122 is more likely to be damaged and cause leakage. In addition, since the edge seal 130 is attached to the outer side wall of the upper aluminum-plastic film 121, it is equivalent to increasing the packaging thickness of the part where the edge seal 130 is located, and in the area where the edge seal is not attached, the battery cell 110 is also more likely to be squeezed and collided to cause deformation.

[0039] In the embodiment of the present application, the battery cell 110 can be divided into a first part and a second part, wherein the first part is the part of the battery cell 110 corresponding to the edge seal 130, and the second part is the part of the battery cell 110 other than the first part, that is, the area without edge seal.

[0040] The soft-pack button battery 100 may include a protection structure 140 , which surrounds the outer circumference of the second portion of the battery cell 110 .

[0041] like Figure 2 and Figure 3 As shown, the protective structure 140 can be located inside the soft package shell 120. Specifically, the protective structure 140 can be located between the lower aluminum-plastic film 122 and the second part of the battery cell 110, the inner side of the protective structure 140 is fixedly connected to the side wall of the second part of the battery cell 110, and a gap can be left between the outer side of the protective structure 140 and the lower aluminum-plastic film, or the protective structure 140 can be directly attached to the inner side of the lower aluminum-plastic film 122. In other words, the protective structure 140 can be located in the space formed by the lower aluminum-plastic film 122, the edge seal 130, and the battery cell 110.

[0042] The material of the protective structure 140 may have insulation, high temperature resistance and other properties to avoid short circuit or deformation under high temperature conditions, thereby affecting the normal function of the battery. The material of the protective structure 140 may be a rigid, hard material, such as plastic, polypropylene (PP), polyethylene and other materials, or may be a flexible material, such as silicone strips, foam and other materials.

[0043] Figure 4 1 is a schematic diagram of a cross section of a soft-package button battery provided in an embodiment of the present application. The cross section is a cross section of the location where the second part of the battery cell 110 is located. Figure 4 The pattern filled with black grids in FIG. 1 may represent the protective structure 140. Figure 4 As shown in (a), (b), and (c), the protective structure 140 may be a circular, elliptical, or square annular structure. The annular structure may be a complete, continuous annular structure, or a Figure 3 and Figure 4 As shown in (d), the annular structure may also have an opening, that is, the annular structure is broken at a certain point.

[0044] In some embodiments, Figure 4 As shown in (e), the protection structure 140 may also include a plurality of unconnected parts surrounding the outer periphery of the second part of the battery cell 110 , and each part is fixedly connected to the side wall of the second part of the battery cell 110 .

[0045] It should be noted that Figure 2 The cross-section of the protective structure 140 shown may be a rectangle. In fact, the cross-section of the protective structure 140 may also be a trapezoid, a triangle, a circle, etc., which is not limited in the embodiment of the present application.

[0046] It should be understood that the height of the protection structure 140 may be less than or equal to the height of the second portion of the battery cell 110. That is, the protection structure 140 and the edge seal 130 do not overlap in the axial direction (the direction perpendicular to the end surface of the battery cell 110).

[0047] In the embodiment of the present application, due to the presence of the edge seal 130, there are three layers of aluminum-plastic film at the first part of the battery cell 110, and there may be a gap between the edge seal 130 and the upper aluminum-plastic film 121. There is one layer of aluminum-plastic film and a protective structure at the second part of the battery cell 110, so the thickness of the protective structure 140 can be designed to be less than or equal to the thickness between the outer wall of the edge seal 130 and the outer wall of the upper aluminum-plastic film 121. In other words, adding the protective structure 140 to the soft-pack button battery 100 will not increase the original diameter of the battery, nor will it affect the energy density of the battery.

[0048] It should be noted that the edge seal 130 may have wrinkles, and the thickness between the outer wall of the edge seal 130 and the outer wall of the upper aluminum-plastic film 121 may refer to the maximum thickness from the edge seal 130 to the outer wall of the upper aluminum-plastic film 121 .

[0049] The soft-pack button battery 100 may also include a positive electrode tab 151 and a negative electrode tab 152. The tab is an important component of the soft-pack button battery. The soft-pack button battery includes a positive electrode and a negative electrode. The tab is a metal conductor that leads the positive and negative electrodes in the battery cell. Usually, the positive electrode tab can be made of aluminum material, and the negative electrode tab can be made of nickel material, copper-plated nickel material, etc. The embodiment of the present application does not limit the material of the tab.

[0050] The positive electrode tab 151 is used as an example for explanation. One end of the positive electrode tab 151 can be connected to the positive electrode sheet of the battery cell 110. For example, the positive electrode tab 151 can be led out from the edge of the bottom of the battery cell 110 (i.e., the side of the battery cell 110 away from the upper aluminum-plastic film 121) (where it is connected to the positive electrode sheet of the battery cell 110), and is attached to the side wall of the battery cell 110 and extends to the edge seal 130, and then passes through the edge seal 130, and extends from between the upper aluminum-plastic film 121 and the lower aluminum-plastic film 122 to the external space of the soft-pack shell 120.

[0051] It can be understood that a portion of the positive electrode tab 151 is located inside the soft-package shell 120, a portion is located at the edge seal 130, and another portion is located outside the soft-package shell 120. Among them, one end of the portion of the positive electrode tab 151 located inside the soft-package shell 120 is connected to the positive electrode sheet of the battery cell 110. The portion of the positive electrode tab 151 located at the edge seal 130 is sandwiched between the upper aluminum-plastic film 121 and the lower aluminum-plastic film 122, and extends to the external space of the soft-package shell 120.

[0052] It should be understood that during the packaging process, the positive electrode tab 151 has been pre-leaded out of the battery cell 110 and is set at a suitable position so that the positive electrode tab 151 appears as follows after packaging. Figure 2 , Figure 3 The structure shown.

[0053] In some embodiments, the portion of the positive electrode tab 151 located at the edge seal 130 is coated with a positive electrode tab glue 161, and similarly, the portion of the negative electrode tab 152 located at the edge seal 130 is coated with a negative electrode tab glue 142. The tab glue is an insulating portion on the tab, which can prevent a short circuit between the tab and the aluminum-plastic film, and the tab glue can bond the tab to the upper aluminum-plastic film and the lower aluminum-plastic film after hot pressing, which can prevent leakage and help improve the sealing of the battery.

[0054] It should be understood that the structure of the negative electrode tab 152 is the same as that of the positive electrode tab 151 . For details, please refer to the relevant description of the positive electrode tab 151 , which will not be repeated here.

[0055] Figure 5 It is a schematic diagram of a longitudinal section of another soft-pack button battery 100 provided in an embodiment of the present application. Figure 6 It is a schematic diagram of the structure of another soft-pack button battery 100 provided in an embodiment of the present application. Figure 5 and Figure 6 The structure of the soft-pack button battery shown is Figure 2 and Figure 3 The soft-pack button battery shown is similar to the one shown above. For details, please refer to Figure 2 and Figure 3 , only the differences are described.

[0056] like Figure 5 and Figure 6 As shown, the size of the groove on the upper aluminum-plastic film 121 and the groove on the lower aluminum-plastic film 122 can be the same. After the packaging is completed, there may be no gap between the lower aluminum-plastic film 122 and the second part of the battery cell 110, but it can be directly attached to the side wall of the second part of the battery cell 110. The protective structure 140 may not be located inside the soft package shell 120, but outside the soft package shell 120, fixedly connected to the outer side wall of the lower aluminum-plastic film 122, so as to surround the outer periphery of the second part of the battery cell 110.

[0057] It can be understood that at least a portion of the lower aluminum-plastic film 122 is located between the protection structure 140 and the second portion of the battery cell 110 .

[0058] In the embodiment of the present application, the protective structure 140 can be fixedly connected to the second part of the battery cell 110, or fixedly connected to the outer side wall of the lower aluminum-plastic film 122. Alternatively, the protective structure 140 can also be sleeved on the second part of the battery cell 110, or on the outer side wall of the lower aluminum-plastic film 122 only by friction.

[0059] The fixed connection in the embodiments of the present application may refer to snap connection, bonding, etc. The embodiments of the present application do not limit the method of fixed connection.

[0060] In the embodiment of the present application, the soft-pack button battery 100 can be applied to electronic devices such as Bluetooth headsets, computer motherboards, electronic watches, electronic dictionaries, electronic scales, remote controls, electric toys, pacemakers, electronic hearing aids, counters, cameras, etc. The embodiment of the present application does not limit the application scenarios of the soft-pack button battery 100.

[0061] Figure 7 FIG. 1 is a simulation diagram of the installation process of a soft-pack button battery provided in an embodiment of the present application. Figure 7As shown, the initial position of the soft-pack button battery overlaps the radial edge of the battery compartment (simulating the conical battery compartment of the Bluetooth headset) by 0.5mm, 1mm, and 1.5mm respectively. Then the soft-pack button battery is moved along the battery axis with a constant force of 20N and loaded into the battery compartment. The stress and deformation of the OH area of ​​the core (taking the diaphragm in the core as an example) were tested under different overlap amounts. Among them, the traditional solution is a solution without adding a protective structure; Solution 1 is that the protective structure is located inside the soft-pack shell, and the material of the protective structure is a flexible material; Solution 2 is that the protective structure is located outside the soft-pack shell, and the material of the protective structure is a rigid, hard material.

[0062] As shown in Table 1, compared with the traditional scheme, the deformation of the battery diaphragm is reduced by a similar amount under different overlapping conditions. Among them, the deformation of the diaphragm in scheme 1 is greatly reduced by about 80%, and the deformation of the diaphragm in scheme 2 is reduced by about 40%.

[0063] Table 1 Diaphragm deformation data

[0064] Overlap 0.5mm 1mm 1.5mm Traditional Solution 0.022 0.037 0.037 Solution 1 0.005 0.009 0.006 Solution 2 0.012 0.02 0.023

[0065] As shown in Table 2, the greater the overlap, the greater the stress value of the diaphragm. Compared with the traditional solution, when the overlap is 0.5 mm, 1 mm and 1.5 mm, the stress value of the diaphragm in Solution 1 is reduced by 33%, 36% and 46% respectively, while the stress value of Solution 2 is reduced by 11%, 25% and 27% respectively.

[0066] Table 2 Diaphragm stress data

[0067] Overlap 0.5mm 1.0mm 1.5mm Traditional Solution 22.48 28.74 32.42 Solution 1 15.07 18.29 17.51 Solution 2 20.11 21.47 23.68

[0068] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A soft-pack button battery, characterized in that: include: Battery cells; An upper aluminum-plastic film and a lower aluminum-plastic film, wherein the upper aluminum-plastic film and the lower aluminum-plastic film cover the battery core, and the peripheries of the upper aluminum-plastic film and the lower aluminum-plastic film are attached together to form an edge seal, and the edge seal is folded on the outer side wall of the upper aluminum-plastic film, The battery cell comprises a first part and a second part, the first part is a part of the battery cell corresponding to the edge sealing, and the second part is a part of the battery cell excluding the first part; A protective structure is provided, and the protective structure surrounds the outer periphery of the second part, and the protective structure is located between the lower aluminum-plastic film and the second part, or at least a part of the lower aluminum-plastic film is located between the protective structure and the second part.

2. The soft-pack button battery according to claim 1, characterized in that: The protective structure is a ring structure.

3. The soft-pack button battery according to claim 2, characterized in that: The annular structure has an opening.

4. The soft-package button battery according to any one of claims 1 to 3, characterized in that: The thickness of the protective structure is less than or equal to the thickness from the outer side wall of the edge sealing to the outer side wall of the upper aluminum-plastic film.

5. The soft-package button battery according to any one of claims 1 to 4, characterized in that: The battery core is a winding core, and the upper aluminum-plastic film and the lower aluminum-plastic film are arranged opposite to each other along the axial direction of the winding core.

6. The soft-package button battery according to any one of claims 1 to 5, characterized in that: The material of the protective structure is plastic, silica gel or foam.

7. The soft-package button battery according to any one of claims 1 to 6, characterized in that: Also includes: A pole ear, one end of which is connected to the positive electrode sheet or the negative electrode sheet of the battery cell, and the other end of which extends through the edge seal to the external space.

8. The soft-pack button battery according to claim 5, characterized in that: The portion of the tab located at the edge sealing is covered with tab glue.

9. A headset, characterized in that: The earphone comprises a soft-pack button battery as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: The earphone comprises a soft-pack button battery as claimed in any one of claims 1 to 8.

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