Secondary battery and electric device

Abstract

A secondary battery (1) and an electric device (2). The secondary battery (1) comprises a secondary battery body (10) and a first connector (21). The secondary battery body (10) is provided with a main body portion (111) and a first side sealing edge (112), wherein the main body portion (111) comprises a first main wall (1111), a second main wall (1112) and a first side wall (1113); in a first direction, the first main wall (1111) is arranged opposite the second main wall (1112), the first side wall (1113) is connected between the first main wall (1111) and the second main wall (1112), and the first side sealing edge (112) extends out of the first side wall (1113) and is fixed to the first side wall (1113) in a manner of turning and folding. The first connector (21) comprises a first fixing portion (211) and a first connecting portion (212) connected to the first fixing portion (211), wherein the first fixing portion (211) is fixed to the first side sealing edge (112), the first connecting portion (212) is beyond one end of the first side sealing edge (112) in a second direction, and the first connecting portion (212) is configured to be detachably connected to the electric device (2), so as to fix the secondary battery (1) in a battery compartment of the electric device (2). In this way, the secondary battery body (10) can be detachably connected to the electric device (2) by means of the first connector (21), so as to facilitate subsequent disassembly and replacement of the secondary battery (1).

Description

Secondary battery and electrical device Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a secondary battery and an electrical device. Background Art

[0002] In electrical devices such as mobile phones, secondary batteries are typically fixed to the battery compartment of the device by bonding, for example, by applying double-sided tape to the large surface of the secondary battery. However, this connection method is not convenient for subsequent removal and replacement of the secondary battery.

[0003] Application Contents

[0004] The purpose of this application is to provide a secondary battery and an electrical device to facilitate the subsequent disassembly and replacement of the secondary battery.

[0005] According to the first aspect of the present application, a secondary battery is provided, which includes a secondary battery body and a first connecting member. The secondary battery body has a main body and a first side seal, the main body includes a first main wall, a second main wall and a first side wall, along the first direction, the first main wall and the second main wall are arranged opposite to each other, the first side wall is connected between the first main wall and the second main wall, the first side seal extends out of the first side wall, and is folded and fixed to the first side wall. The first connecting member includes a first fixing portion and a first connecting portion connected to the first fixing portion, the first fixing portion is fixed to the first side seal, the first connecting portion extends beyond one end of the first side seal along the second direction, and the first connecting portion is configured to be detachably connected to an electrical device to fix the secondary battery in the battery compartment of the electrical device. Wherein, the second direction is perpendicular to the first direction.

[0006] The secondary battery involved in this application can achieve a detachable connection between the secondary battery body and the electrical device via a first connector, facilitating subsequent removal and replacement of the secondary battery. Specifically, the first connector is fixed to the side of the secondary battery body, and the secondary battery body is detachably fixed to the battery compartment of the electrical device via the first connecting portion. Therefore, there is no need to cover the secondary battery body with a film and apply double-sided tape to its large surface. The longitudinal space of the secondary battery in the third direction is increased, thereby improving the volumetric energy density of the secondary battery.

[0007] In one or more / optional embodiments above, the first connecting portion is provided with a first through hole. The first through hole is configured for a threaded fastener to pass through, and the threaded fastener can screw the first connecting portion to the electrical device. The processing difficulty of punching a hole in the first connecting portion is relatively low, which is conducive to improving the manufacturing efficiency of the secondary battery. In addition, the secondary battery involved in the present application has a higher connection strength using a threaded connection. Compared with electrical devices such as mobile phones that traditionally use contact pressing to fix secondary batteries, the drop resistance of the electrical device can be improved to cope with working conditions such as vibration or impact.

[0008] In one or more / optional embodiments above, the first connecting portion includes a first connecting segment and a second connecting segment. The first connecting segment extends from one end of the first fixing portion along the second direction. The second connecting segment is connected to the first fixing portion through the first connecting segment, and the extension direction of the second connecting segment is parallel to the third direction. Wherein, any two of the third direction, the second direction, and the first direction are perpendicular to each other. The first through hole is provided in the second connecting segment. Thus, the first through hole can face the user, and the user can conveniently screw the threaded fastener to complete the disassembly and assembly of the secondary battery.

[0009] In one or more / optional embodiments above, the secondary battery includes a second connector. The second connector includes a second fixing portion and a second connecting portion connected to the second fixing portion. The second fixing portion is fixed to the first side seal, and the second connecting portion extends beyond the other end of the first side seal along the second direction. The second connecting portion is configured to detachably connect to the electrical device to secure the secondary battery within the battery compartment of the electrical device.

[0010] In one or more / optional embodiments above, the first fixing portion and the second fixing portion are integrally formed. In other words, the first connecting member and the second connecting member can be two parts of the same component, reducing the number of parts required to fix the secondary battery body, thereby improving the assembly efficiency of the secondary battery.

[0011] In one or more / optional embodiments described above, the second connecting portion defines a second through-hole. The second through-hole is configured to receive a threaded fastener, which can threadably secure the second connecting portion to the electrical device. Due to the similar functionality as the first through-hole, reference will be made to the functionality of the first through-hole and will not be further elaborated upon here.

[0012] In one or more / optional embodiments above, the second connecting portion includes a third connecting segment and a fourth connecting segment. The third connecting segment extends from one end of the second fixing portion along the second direction. The fourth connecting segment is connected to the second fixing portion through the third connecting segment, and the extension direction of the fourth connecting segment is parallel to the third direction. Wherein, any two of the third direction, the second direction, and the first direction are perpendicular to each other. The second through hole is provided in the fourth connecting segment. Thus, the second through hole can face the user, and the user can further conveniently screw the threaded fastener to complete the disassembly and assembly of the secondary battery.

[0013] In one or more / optional embodiments above, the first side seal is a double fold. The first side seal includes a first curved portion, a first extension, a second curved portion, and a second extension. The first curved portion extends outward from the first side wall. The first extension is connected to the first curved portion. The second extension is connected to the first extension via the second curved portion. The first curved portion, the first extension, the second curved portion, and the second extension together enclose a slot. The first fixing portion is fixed to the slot.

[0014] Due to the structural characteristics of the first curved portion and the second curved portion, there is still a certain gap even after bending, and the first fixing portion is fixed in the slot formed by the first curved portion and the second curved portion. Reflected in the third direction, the width of the first connecting member and the first side seal as a whole is smaller than the overall width of the first connecting member directly fixed to the side of the first extension portion away from the second extension portion, thereby further increasing the volume energy density of the secondary battery in the third direction.

[0015] In one or more / optional embodiments above, the first extension portion is bonded and fixed to the first side wall, thereby preventing the first extension portion from warping in a direction away from the main body portion.

[0016] In one or more / optional embodiments above, the second extension portion is bonded and fixed to the first side wall.

[0017] In one or more / optional embodiments above, the first extension portion and the second extension portion abut against the first fixing portion. As a result, the first connector is partially enclosed within the first side seal, allowing the first connector to be connected to the second extension portion and the first extension portion, respectively. Therefore, the first connector does not need to be secured with an additional adhesive, thereby reducing the manufacturing cost of the secondary battery.

[0018] In one or more / optional embodiments above, the first side seal is a single fold. The first side seal includes a first curved portion and a first extension. The first curved portion extends outward from the first side wall. The first extension is connected to the first curved portion. The first curved portion, the first extension, and the first side wall together enclose a slot. The first fixing portion is fixed to the slot.

[0019] According to a second aspect of the present application, there is provided an electrical device comprising the secondary battery described above.

[0020] Additional aspects and advantages of the embodiments of the present application will be described, shown, or explained in part in the following description through implementation of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0022] FIG1 shows a schematic diagram of a structure in which a secondary battery can be detachably fixed to an electrical device;

[0023] FIG2 shows a schematic structural diagram of a secondary battery provided in the first embodiment of the present application;

[0024] FIG3 shows a schematic structural diagram of another secondary battery provided by the first embodiment of the present application;

[0025] FIG4 is a cross-sectional view of the secondary battery shown in FIG2 along line AA;

[0026] FIG5 is a top view of the secondary battery shown in FIG2 , wherein the tab is electrically connected to the electrode assembly;

[0027] FIG6 is a schematic structural diagram of the secondary battery shown in FIG2 when the first connecting member and the second connecting member are separated;

[0028] FIG7 is a schematic structural diagram of the second connecting member in the secondary battery shown in FIG2 when the first connecting member is connected;

[0029] FIG8 shows a schematic structural diagram of another secondary battery provided in the first embodiment of the present application;

[0030] FIG9 is a schematic structural diagram of the secondary battery shown in FIG8 when the first connecting member and the second connecting member are separated;

[0031] FIG10 is a schematic structural diagram of the second connecting member in the secondary battery shown in FIG8 when the first connecting member is connected;

[0032] FIG11 is a schematic structural diagram of another type of the secondary battery shown in FIG2 when the first connecting member and the second connecting member are separated;

[0033] FIG12 shows a schematic structural diagram of a secondary battery provided in a second embodiment of the present application;

[0034] FIG13 is a cross-sectional view of the secondary battery shown in FIG12 along line BB;

[0035] FIG14 shows a schematic structural diagram of a secondary battery provided in a third embodiment of the present application;

[0036] FIG15 is a cross-sectional view taken along line CC of the secondary battery shown in FIG14.

[0037] 1. Secondary battery;

[0038] 10. Secondary battery body; 11. Soft bag body; 111. Main body; 1111. First main wall; 1112. Second main wall; 1113. First side wall; 1114. Second side wall; 1115. Third side wall; 1116. Fourth side wall; 112. First side seal; 1121. First bend; 1122. First extension; 1123. Second bend; 1124. Second extension; 12. Electrode assembly; 121. First pole piece; 122. Second pole piece; 123. Separator; 13. Tabs; 131. First tab; 132. Second tab.

[0039] 21, first connecting member; 211, first fixing portion; 212, first connecting portion; 2121, first connecting section; 2122, second connecting section; 21a, first through hole;

[0040] 22, second connecting member; 221, second fixing portion; 222, second connecting portion; 2221, third connecting section; 2222, fourth connecting section; 22a, second through hole;

[0041] 2. Electrical equipment. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0043] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0045] The term "perpendicular" is used to describe the ideal state between two components. In actual production or use, there may be a state that is approximately perpendicular between the two components. For example, combined with numerical descriptions, perpendicular can refer to the angle between two straight lines being in the range of 90°±10°, perpendicular can also refer to the dihedral angle between two planes being in the range of 90°±10°, and perpendicular can also refer to the angle between a straight line and a plane being in the range of 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0046] The term "parallel" is used to describe the ideal state between two components. In actual production or use, there may be a state of approximate parallelism between the two components. For example, combined with numerical descriptions, parallel can refer to the angle between two straight lines being in the range of 180°±10°, parallel can also refer to the dihedral angle between two planes being in the range of 180°±10°, and parallel can also refer to the angle between a straight line and a plane being in the range of 180°±10°. The two components described as "parallel" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if its overall extension direction is a straight line or a plane.

[0047] The technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0048] The secondary battery provided in this application can be used in electrical devices to maintain stable operation. Examples of such devices include mobile phones, laptops, tablet computers, game consoles, drones, electric cars, electric bicycles, power tools, and Bluetooth headsets. For ease of understanding, Figures 1 to 15 illustrate each embodiment using a secondary battery applied to a mobile phone.

[0049] Figure 1 shows a schematic diagram of a secondary battery removably secured to an electrical device. Referring to Figure 1 , the electrical device 2 includes a battery compartment shaped to fit the secondary battery 1 and a screw hole (not shown) positioned adjacent to the periphery of the compartment. This screw hole is designed to engage a first connector (described below). A threaded fastener (not shown) can be threaded through the first connector into the screw hole, securing the secondary battery within the compartment.

[0050] First embodiment

[0051] Figure 2 shows a schematic structural diagram of a secondary battery provided in the first embodiment of the present application; Figure 3 shows a schematic structural diagram of another secondary battery provided in the first embodiment of the present application; Figure 8 shows a schematic structural diagram of yet another secondary battery provided in the first embodiment of the present application.

[0052] Please refer to Figure 1 in conjunction with Figures 2, 3, or 8. The secondary battery includes a secondary battery body 10 and a first connector 21. The secondary battery body 10 engages with an electrical device via the first connector 21 to removably secure the secondary battery body 10 within the battery compartment of the electrical device. This facilitates replacement of the secondary battery.

[0053] In some embodiments, the secondary battery body 10 is a soft-pack battery cell.

[0054] Please refer to Figure 2, Figure 3 or Figure 8 in conjunction with Figure 5. The secondary battery body 10 includes a soft bag body 11, an electrode assembly 12 and a tab 13. The soft bag body 11 has a main body 111 and a first side seal 112 extending outward from one side of the main body 111. The main body 111 itself defines a accommodating cavity that is adapted to the shape of the electrode assembly 12, and the electrode assembly 12 is placed in the accommodating cavity. The first side seal 112 is folded and fixed to the first side wall 1113, and the first connecting member 21 is fixed to the first side seal 112. The tab 13 is electrically connected to the electrode assembly 12, and the tab 13 extends out of the main body 111.

[0055] In some embodiments, the tab 13 is configured to electrically connect to the charging and discharging circuit of an electrical device. It should be understood that the embodiments of this application do not specifically limit the connection method between the tab 13 and the charging and discharging circuit of the electrical device; both can be adaptively adjusted based on actual usage requirements. For example, in some embodiments, the tab 13 can be electrically connected to the charging and discharging circuit of the electrical device via a flexible printed circuit board connector. In other embodiments, the tab 13 can be electrically connected to the charging and discharging circuit of the electrical device via metal contacts.

[0056] In some embodiments, referring to FIG2 in conjunction with FIG4 , the secondary battery body 10 is generally in the shape of a flat rectangular parallelepiped, that is, the main body 111 is generally in the shape of a flat rectangular parallelepiped. The main body 111 may include a first main wall 1111, a second main wall 1112, a first side wall 1113, a second side wall 1114, a third side wall 1115, and a fourth side wall 1116. The first side wall 1113, the second side wall 1114, the third side wall 1115 and the fourth side wall 1116 are connected end to end in sequence, the four sides of the first main wall 1111 are respectively connected to one end of the first side wall 1113, one end of the second side wall 1114, one end of the third side wall 1115 and one end of the fourth side wall 1116, the four sides of the second main wall 1112 are respectively connected to the other end of the first side wall 1113, the other end of the second side wall 1114, the other end of the third side wall 1115 and the other end of the fourth side wall 1116, the first main wall 1111, the second main wall 1112, the first side wall 1113, the second side wall 1114, the third side wall 1115 and the fourth side wall 1116 together enclose the aforementioned accommodating cavity. Among them, the first main wall 1111 and the second main wall 1112 are arranged opposite to each other along the first direction X, the second side wall 1114 and the fourth side wall 1116 are arranged opposite to each other along the second direction Y, and the first side wall 1113 and the third side wall 1115 are arranged opposite to each other along the third direction Z, and any two of the third direction Z, the second direction Y and the first direction X are perpendicular to each other.

[0057] It should be noted that the first main wall 1111 and the second main wall 1112 mentioned here correspond to the two large surfaces of the electrode assembly 12 to be described in detail below. The two large surfaces of the electrode assembly 12 are the two parts with the largest area on the electrode assembly 12. That is to say, the first main wall 1111 and the second main wall 1112 are arranged relative to each other along the first direction X, which is equivalent to the first main wall 1111 and the second main wall 1112 being arranged relative to each other along the thickness direction of the electrode assembly 12.

[0058] The second side wall 1114 and the fourth side wall 1116 respectively correspond to the two side surfaces of the electrode assembly 12 with the smallest area, which will be described in detail below. That is, the second side wall 1114 and the fourth side wall 1116 are arranged relative to each other along the second direction Y, which is equivalent to the second side wall 1114 and the fourth side wall 1116 being arranged relative to each other along the width direction of the electrode assembly 12.

[0059] The first side wall 1113 and the third side wall 1115 correspond to two side surfaces of moderate area of ​​the electrode assembly 12 to be described in detail below, that is, the first side wall 1113 and the third side wall 1115 are arranged relative to each other along the third direction Z, which is equivalent to the first side wall 1113 and the third side wall 1115 being arranged relative to each other along the length direction of the electrode assembly 12.

[0060] In some embodiments, as shown in FIG. 4 , the first side sealing edge 112 is provided with a clamping groove (not shown) for clamping the first connecting member 21 . Specifically, the first side seal 112 is a double folded edge, which includes a first bent portion 1121, a first extension portion 1122, a second bent portion 1123 and a second extension portion 1124; wherein the first bent portion 1121 is bent and extended in a direction facing the first side wall 1113; the first extension portion 1122 is connected to the end of the first bent portion 1121 away from the first side wall 1113, and the first extension portion 1122 extends in a direction parallel to the first direction X; the second bent portion 1123 is bent and extended from the first extension portion 1122 in a direction facing the first side wall 1113 and then bent and extended in a direction parallel to the third direction Z; the second extension portion 1124 extends in a direction parallel to the first direction X toward the first bent portion 1121; the first bent portion 1121, the first extension portion 1122, the second bent portion 1123 and the second extension portion 1124 together enclose the aforementioned slot.

[0061] In some embodiments, the second extension portion 1124 is bonded to the first side wall 1113. For example, the second extension portion 1124 can be bonded to the first side wall 1113 using, but not limited to, double-sided tape, glue, or adhesive tape. Examples of such adhesives include hot melt adhesive, animal glue, and synthetic resin glue.

[0062] The specific structure of the soft bag body 11 is not specifically limited in the various embodiments of this application; it is sufficient that it exhibits barrier properties, electrolyte corrosion resistance, and is lightweight. Materials for the soft bag body 11 may include, but are not limited to, aluminum-plastic film, plastic materials, metal materials, or composite materials of plastic and metal. For example, the soft bag body 11 may be made of aluminum-plastic film.

[0063] In the aforementioned embodiments, as shown in Figures 2 to 4 , the secondary battery body 10 is illustrated as a flat rectangular parallelepiped. Those skilled in the art will appreciate that the shape of the secondary battery body 10 is not limited thereto and can vary with the shape of the electrode assembly 12, as long as the first side seal 112 extends from the first side wall 1113 of the main body 111.

[0064] In some embodiments, as shown in FIG5 , the electrode assembly 12 is generally in the shape of a flat rectangular parallelepiped and includes a first electrode piece 121, a second electrode piece 122, and a separator 123 separating the first electrode piece 121 and the second electrode piece 122. In some embodiments, the first electrode piece 121, the separator 123, and the second electrode piece 122 are alternately stacked, or a single stack and multiple windings can be performed to obtain different types of electrode assemblies 12.

[0065] The first electrode piece 121 is electrically connected to the first electrode tab 131 in the electrode tab 13, and the second electrode piece 122 is electrically connected to the second electrode tab 132 in the electrode tab 13. As shown in FIG2 or FIG3 , the first electrode tab 131 and the second electrode tab 132 extend from the same side of the electrode assembly 12 to the third sidewall 1115, and the first electrode tab 131 and the second electrode tab 132 are spaced apart along the third direction Z.

[0066] Next, an example is given in which the first electrode 121 is a positive electrode and the second electrode 122 is a negative electrode.

[0067] In some embodiments, the first electrode sheet 121 may include a first current collector (not shown) and a first active material layer (not shown), and the first active material layer is disposed on at least one surface of the first current collector.

[0068] As an example, the first current collector may include at least one or more conductive metal sheets such as, but not limited to, aluminum mesh, aluminum foil, and copper foil.

[0069] The first active material layer may include at least one or more of, but not limited to, lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium manganese oxide, lithium nickel oxide, lithium manganese iron phosphate, lithium vanadium phosphate, lithium iron phosphate, and lithium-rich manganese-based materials.

[0070] In some embodiments, the second electrode sheet 122 may include a second current collector (not shown) and a second active material layer (not shown), and the second active material layer is disposed on at least one surface of the second current collector.

[0071] As an example, the second current collector may include at least one or two of conductive metal sheets such as, but not limited to, nickel foil and copper foil.

[0072] The second active material layer may include at least one or more of, but not limited to, artificial graphite, natural graphite, soft carbon, hard carbon, graphene, mesocarbon microbeads, silicon-based materials, tin-based materials, lithium carbonate, or other metals capable of forming an alloy with lithium.

[0073] In some embodiments, the separator 123 includes, but is not limited to, at least one of polyethylene, polypropylene, polyethylene terephthalate, polyimide, and aramid. For example, polyethylene includes at least one component selected from high-density polyethylene, low-density polyethylene, and ultra-high molecular weight polyethylene. Polyethylene and polypropylene are particularly effective in preventing short circuits and can improve the stability of secondary batteries through a shutdown effect.

[0074] The surface of the isolation membrane 123 may further include a porous layer. The porous layer is disposed on at least one surface of the isolation membrane 123. The porous layer includes inorganic particles and a binder. The inorganic particles may be selected from, but are not limited to, a combination of one or more of aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, hafnium dioxide, tin oxide, dioxide, nickel oxide, zinc oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, and barium sulfate. The binder may be selected from, but is not limited to, a combination of one or more of polyvinylidene fluoride, a copolymer of vinylidene fluoride and hexafluoropropylene, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, sodium carboxymethyl cellulose, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, and polyhexafluoropropylene.

[0075] The porous layer can improve the heat resistance, oxidation resistance, and electrolyte wetting performance of the isolation membrane 123 , and enhance the adhesion between the isolation membrane 123 and the first electrode piece 121 or the second electrode piece 122 .

[0076] Regarding the first connecting member 21, in some embodiments, the first connecting member 21 includes a first fixing portion 211 and a first connecting portion 212 connected to the first fixing portion 211, the first fixing portion 211 is fixed to the first side seal 112, the first connecting portion 212 extends beyond one end of the first side seal 112 along the second direction Y, and the first connecting portion 212 is configured to be detachably connected to the electrical device to fix the secondary battery in the battery compartment of the electrical device.

[0077] As mentioned in the background, secondary batteries are typically secured to the bottom of the battery compartment by double-sided tape on the bottom surface (first main wall 1111 or second main wall 1112), while the top surface is covered with foam. This not only makes it difficult to remove and replace the secondary battery, but also because the double-sided tape inevitably occupies some of the longitudinal space in the battery compartment in the third direction Z, the limited space available for accommodating the secondary battery within the compartment is reduced, resulting in a loss in the volumetric energy density of the secondary battery.

[0078] In the secondary battery of this application, the first connector 21 is fixed to the side of the secondary battery body, and the secondary battery body 10 is detachably fixed in the battery compartment via the first connecting portion 212. Therefore, there is no need to apply double-sided tape to the large surface (first main wall 1111 or second main wall 1112), and the longitudinal space of the secondary battery body in the third direction Z is increased, thereby improving the volume energy density of the secondary battery.

[0079] The following is a comparison between the secondary battery in the background art and the secondary battery involved in this application.

[0080] Secondary batteries in the background art (double-sided tape + wrapping film): 0.1mm to 0.25mm (thickness of double-sided tape) + 0.12mm (thickness of wrapping film) = 0.22mm to 0.35mm. Taking a battery with a thickness of 4.5mm as an example, the loss of volume energy density is about 4.9% to 7.8%;

[0081] The secondary battery involved in this application: If the screw hole position can be avoided at the end of the whole machine, taking a battery with a width of 6.5 mm as an example, the energy density loss is only reflected in the increase of about 0.4 mm in the battery width, and the loss of energy density is about 0.6%.

[0082] In some embodiments, please refer to Figure 2 and Figure 4 in conjunction with Figure 6. The first connecting member 21 is roughly a thin plate-shaped structure. The first fixing portion 211 is inserted into the card slot, and the first fixing portion 211 abuts against the first extension portion 1122 and the second extension portion 1124 respectively. The first connecting portion 212 is integrally connected to the end of the first fixing portion 211 that is not inserted into the card slot, and extends beyond the end of the first side seal 112 along the second direction Y. The first connecting portion 212 is provided with a first through hole 21a. When the secondary battery body 10 is placed in the battery compartment, the first through hole 21a can at least partially overlap with the screw hole, and the threaded fastener can pass through the first through hole 21a and be screwed and fixed to the screw hole, that is, locking the secondary battery placed in the battery compartment.

[0083] The advantage of such a configuration is that, firstly, due to the structural characteristics of the first curved portion 1121 and the second curved portion 1123, there is still a certain gap even after bending, and the first fixing portion 211 is fixed in the slot formed by the first curved portion 1121 and the second curved portion 1123. Reflected in the third direction Z, the width of the first connecting member 21 and the first side sealing edge 112 as a whole is smaller than the overall width of the first connecting member 21 directly fixed to the side of the first extension portion 1122 away from the second extension portion 1124, thereby increasing the volume energy density of the secondary battery in the third direction Z. Further increase; secondly, since the second extension portion 1124 is fixed to the first side wall 1113, the first fixing portion 211 can be fixed with the first extension portion 1122 and the second extension portion 1124 by interference fit, so that the first connecting member 21 does not need to be fixed with the aid of additional adhesives, saving the manufacturing cost of the secondary battery; thirdly, the secondary battery involved in the present application has a higher connection strength using a threaded connection, compared with traditional electrical devices such as mobile phones that use contact pressing to fix the secondary battery, the anti-drop performance of the electrical device can be improved to cope with working conditions such as vibration or impact.

[0084] It is understood that the detachable connection between the first connecting portion 212 and the electrical device is actually diverse, and the structures of the two can be adaptively adjusted according to actual usage requirements. For example, in other embodiments, the first connecting portion 212 has a buckle position, and the electrical device has a buckle portion at a position corresponding to the buckle position. The buckle portion buckles with the buckle position, thereby achieving a detachable connection between the secondary battery and the electrical device.

[0085] To facilitate the assembly and disassembly of the secondary battery, in some embodiments, as shown in FIG6 , the first connecting portion 212 includes a first connecting segment 2121 and a second connecting segment 2122. The first connecting segment 2121 extends from the end of the first fixing portion 211 away from the card slot in the opposite direction of the second direction Y. The second connecting segment 2122 is connected to the first fixing portion 211 via the first connecting segment 2121. The extension direction of the second connecting segment 2122 is parallel to the third direction Z. The second connecting segment 2122 is provided with the aforementioned first through-hole 21a. Correspondingly, the location of the screw hole of the electrical device can define an avoidance groove (not shown), the bottom of which is connected to the screw hole.

[0086] When the secondary battery is placed in the battery compartment, the second connecting section 2122 is located in the avoidance groove, and the first through hole 21a can at least partially overlap with the screw hole. The first through hole 21a and the screw hole are facing the user during disassembly and assembly, so that the threaded fastener can be conveniently passed through the first through hole 21a and screwed to the screw hole, thereby locking the secondary battery placed in the battery compartment.

[0087] It will be appreciated that the embodiments of the present application do not specifically limit the extension direction of the second connecting section 2122. For example, as shown in FIG3 , in some embodiments, the extension direction of the second connecting section 2122 is parallel to the third direction Z, and the second connecting section 2122 extends in a direction facing the main body 111. For another example, as shown in FIG2 , in other embodiments, the extension direction of the second connecting section 2122 is parallel to the third direction Z, and the second connecting section 2122 extends away from the main body 111.

[0088] Of course, the specific structure of the first connecting portion 212 is not limited to this. In some embodiments, as shown in Figures 8 to 10, the first connecting portion 212 only has a first connecting section 2121, and the first connecting member 21 is generally a straight thin plate. The first connecting section 2121 defines a first through-hole 21a. In this case, the location of the screw hole of the electrical device does not need to define an escape groove, but the screw hole of the electrical device must penetrate a side wall of the battery compartment along the third direction Z. Thus, the threaded fastener passes through the first through-hole 21a and is screwed into the screw hole.

[0089] Moreover, in some other embodiments, as shown in FIG. 11 , the first connecting portion 212 only has a first connecting segment 2121 . The first connecting segment 2121 is arranged at an angle to the first fixing portion 211 . The first connecting segment 2121 defines a first through hole 21 a .

[0090] It should be noted that the first connector 21 should have good bending and impact strength to maintain a stable connection between the secondary battery body 10 and the electrical device. Materials for the first connector 21 include, but are not limited to, cemented carbide, high-toughness ceramics, or plastic steel. If the first connector 21 is made of a conductive material such as cemented carbide, its outer surface must be insulated to prevent short circuits caused by mixing electronic components or secondary batteries within the electrical device.

[0091] In some embodiments, the secondary battery includes a second connecting member 22, the second connecting member 22 includes a second fixing portion 221 and a second connecting portion 222 connected to the second fixing portion 221, the second fixing portion 221 is fixed to the first side seal 112, the second connecting portion 222 extends beyond the other end of the first side seal 112 along the second direction Y, and the second connecting portion 222 is configured to be detachably connected to the electrical device to fix the secondary battery in the battery compartment of the electrical device.

[0092] In some embodiments, please continue to refer to Figure 2 and Figure 4 in conjunction with Figure 6. The second connecting member 22 is roughly a thin plate-like structure. The second fixing portion 221 is inserted into the card slot, and the first fixing portion 211 abuts against the first extension portion 1122 and the second extension portion 1124 respectively. The second connecting portion 222 is integrally connected to the end of the second fixing portion 221 that is not inserted into the card slot, and extends beyond the other end of the first side seal 112 along the second direction Y. The second connecting portion 222 is provided with a second through hole 22a. When the secondary battery body 10 is placed in the battery compartment, the second through hole 22a can at least partially overlap with another screw hole, and another threaded fastener can pass through the second through hole 22a and be screwed to the other screw hole, thereby locking the secondary battery placed in the battery compartment together with the first connecting member 21.

[0093] To facilitate assembly and disassembly of the secondary battery, in some embodiments, as shown in FIG6 , the second connecting portion 222 includes a third connecting segment 2221 and a fourth connecting segment 2222. The third connecting segment 2221 extends from the end of the second fixing portion 221 away from the slot along the second direction Y. The fourth connecting segment 2222 is connected to the second fixing portion 221 via the third connecting segment 2221. The fourth connecting segment 2222 extends parallel to the third direction Z. The fourth connecting segment 2222 defines the aforementioned second through-hole 22a. Correspondingly, the location of the other screw hole of the electrical device can define another escape groove, the bottom of which is connected to the other screw hole.

[0094] It will be appreciated that the embodiments of the present application do not specifically limit the extension direction of the fourth connecting segment 2222. For example, as shown in FIG3 , in some embodiments, the extension direction of the fourth connecting segment 2222 is perpendicular to the extension direction of the third connecting segment 2221, and the fourth connecting segment 2222 extends in a direction facing the main body 111. For another example, as shown in FIG2 , in other embodiments, the extension direction of the fourth connecting segment 2222 is perpendicular to the extension direction of the third connecting segment 2221, and the fourth connecting segment 2222 extends away from the main body 111.

[0095] Of course, the specific structure of the second connecting portion 222 is not limited to this. In some embodiments, as shown in Figures 8 to 10, the second connecting portion 222 may only have the third connecting section 2221, that is, the second connecting member 22 as a whole has a straight thin plate structure. The third connecting section 2221 defines a second through-hole 22a. In this case, the location of the other screw hole of the electrical device does not need to define another avoidance groove, but the other screw hole of the electrical device must penetrate a side wall of the battery compartment along the third direction Z. Thus, the threaded fastener passes through the second through-hole 22a and is screwed to the other screw hole.

[0096] It should be noted that the second connector 22 should have excellent bending and impact strength to maintain a stable connection between the secondary battery body 10 and the electrical device. Materials for the second connector 22 include, but are not limited to, cemented carbide, high-toughness ceramics, or plastic steel. If the second connector 22 is made of a conductive material such as cemented carbide, its outer surface must be insulated to prevent short circuits caused by mixing electronic components or secondary batteries within the electrical device.

[0097] In some embodiments, as shown in Figure 7 or Figure 10, the second connecting member 22 and the first connecting member 21 can be two parts of the same component. For example, the first fixing portion 211 and the second fixing portion 221 are integrally formed.

[0098] During specific implementation, the overall structure formed by the first fixing portion 211 and the second fixing portion 221 can be first placed on the first side edge seal 112 to be folded; then, the overall structure formed by the first fixing portion 211 and the second fixing portion 221 is folded together with the first side edge seal 112; and then the second extension portion 1124 is bonded and fixed to the first side wall 1113, so that the overall structure formed by the first fixing portion 211 and the second fixing portion 221 are respectively against the first extension portion 1122 and the second extension portion 1124.

[0099] In some embodiments, the first through hole 21a and / or the second through hole 22a are screw holes. Of course, the first through hole 21a and / or the second through hole 22a are through holes.

[0100] Second embodiment

[0101] FIG12 is a schematic structural diagram of a secondary battery provided in the second embodiment of the present application, and FIG13 is a cross-sectional view along line BB in FIG12 .

[0102] As shown in Figure 13, the first side edge seal 112 is still a double-folded edge, and it also includes a first curved portion 1121, a first extension portion 1122, and a second extension portion 1124. The formation method of the first curved portion 1121 and the first extension portion 1122 is the same as the formation method of the first curved portion 1121 and the first extension portion 1122 in the double-folded edge described above. However, the difference from the first side edge seal 112 being a double-folded edge described above is that the second curved portion 1123 first bends and extends away from the first side wall 1113 and then bends and extends to a direction parallel to the third direction Z; the second extension portion 1124 extends in a direction parallel to the third direction Z and away from the second curved portion 1123; the first extension portion 1122, the second curved portion 1123, and the second extension portion 1124 together enclose the aforementioned slot.

[0103] In some embodiments, the first extension portion 1122 is bonded to the first side wall 1113. For example, the first extension portion 1122 can be bonded to the first side wall 1113 using, but not limited to, double-sided tape, glue, or tape. Examples of such glue include hot melt glue, animal glue, or synthetic resin glue.

[0104] The specific connection method for the first side edge seal 112 and its connected components is not specifically limited herein. For example, if the first connecting member 21, the second connecting member 22, or the first connecting member 21 and the second connecting member 22 are two parts of the same component, one of the three may abut against the first extension portion 1122 and the second extension portion 1124. Alternatively, one of the three may be adhesively fixed to the first extension portion 1122 and the second extension portion 1124.

[0105] Third embodiment

[0106] FIG14 is a schematic structural diagram of a secondary battery provided in the third embodiment of the present application, and FIG15 is a cross-sectional view of the secondary battery shown in FIG14 along line CC.

[0107] As shown in Figure 15, in some embodiments, the first side edge seal 112 is a single folded edge, which includes a first bent portion 1121 and a first extension portion 1122; the first bent portion 1121 is formed by bending and extending in a direction facing the first side wall 1113; the first extension portion 1122 is connected to an end of the first bent portion 1121 away from the first side wall 1113, and the first extension portion 1122 extends in a direction parallel to the third direction Z; the first side wall 1113, the first bent portion 1121 and the first extension portion 1122 together enclose the aforementioned slot.

[0108] When the first connecting member 21 and the second connecting member 22 , or the first connecting member 21 and the second connecting member 22 are two parts of the same component, one of the three can be adhesively fixed to the first extending portion 1122 and the first side wall 1113 .

[0109] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A secondary battery, comprising a secondary battery body, the secondary battery body having a main body and a first side seal, the main body comprising a first main wall, a second main wall and a first side wall, along a first direction, the first main wall and the second main wall are arranged opposite to each other, the first side wall is connected between the first main wall and the second main wall, the first side seal extends out of the first side wall and is folded and fixed to the first side wall; characterized in that: The secondary battery includes a first connecting member, the first connecting member includes a first fixing portion and a first connecting portion connected to the first fixing portion, the first fixing portion is fixed to the first side edge seal, the first connecting portion extends beyond one end of the first side edge seal along a second direction, and the first connecting portion is configured to be detachably connected to an electrical device to fix the secondary battery in a battery compartment of the electrical device, wherein the second direction is perpendicular to the first direction.

2. The secondary battery according to claim 1, characterized in that: The first connecting portion is provided with a first through hole, and the first through hole is configured to allow a threaded fastener to pass through, and the threaded fastener can threadably fix the first connecting portion to the electrical device.

3. The secondary battery according to claim 2, characterized in that: The first connecting portion includes a first connecting section and a second connecting section, and the first connecting section extends from one end of the first fixing portion along the second direction; The second connecting section is connected to the first fixing portion through the first connecting section, and an extending direction of the second connecting section is parallel to a third direction, wherein any two of the third direction, the second direction and the first direction are perpendicular to each other; The first through hole is disposed in the second connecting section.

4. The secondary battery according to any one of claims 1 to 3, characterized in that: The secondary battery includes a second connecting member, which includes a second fixing portion and a second connecting portion connected to the second fixing portion, the second fixing portion is fixed to the first side edge seal, the second connecting portion extends beyond the other end of the first side edge seal along the second direction, and the second connecting portion is configured to be detachably connected to the electrical device to fix the secondary battery in a battery compartment of the electrical device.

5. The secondary battery according to claim 4, characterized in that: The first fixing portion and the second fixing portion are integrally formed.

6. The secondary battery according to claim 4, characterized in that: The second connecting portion is provided with a second through hole, and the second through hole is configured to allow a threaded fastener to pass through, and the threaded fastener can threadably fix the second connecting portion to the electrical device.

7. The secondary battery according to claim 6, characterized in that: The second connecting portion includes a third connecting segment and a fourth connecting segment, and the third connecting segment extends from one end of the second fixing portion along the second direction; The fourth connecting section is connected to the second fixing portion through the third connecting section, and an extending direction of the fourth connecting section is parallel to a third direction, wherein any two of the third direction, the second direction and the first direction are perpendicular to each other; The second through hole is disposed in the fourth connecting section.

8. The secondary battery according to any one of claims 1 to 3, characterized in that: The first side edge sealing is a double folded edge; The first side edge seal includes a first bent portion, a first extending portion, a second bent portion and a second extending portion, the first bent portion extends outward from the first side wall, the first extending portion is connected to the first bent portion, the second extending portion is connected to the first extending portion through the second bent portion, the first bent portion, the first extending portion, the second bent portion and the second extending portion together enclose a slot, and the first fixing portion is fixed to the slot.

9. The secondary battery according to claim 8, characterized in that: The first extension portion is bonded and fixed to the first side wall; or The second extension portion is bonded and fixed to the first side wall.

10. The secondary battery according to claim 8, characterized in that: The first extending portion and the second extending portion are in contact with the first fixing portion.

11. The secondary battery according to any one of claims 1 to 3, characterized in that: The first side edge sealing is a single folded edge; The first side edge seal includes a first bent portion and a first extending portion. The first bent portion extends outward from the first side wall, the first extending portion is connected to the first bent portion, the first bent portion, the first extending portion and the first side wall together enclose a slot, and the first fixing portion is fixed to the slot.

12. An electrical device, characterized in that: The invention comprises the secondary battery according to any one of claims 1 to 11.

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