Hard-shell battery cell and power utilization device

Abstract

The embodiment of the invention relates to the technical field of batteries, and discloses a hard-shell battery cell and a power utilization device. The hard-shell battery cell comprises an insulated shell, an electrode assembly, a tab and a sealant. The shell is provided with an accommodating cavity. The electrode assembly is accommodated in the accommodating cavity. The shell is provided with a through hole for the pole lug to penetrate through, the through hole comprises an accommodating groove and a communicating hole, the outer surface of the shell is concave inwards to form the accommodating groove, the section contour of one end, deviating from the accommodating cavity, of the accommodating groove is larger than that of one end, close to the accommodating cavity, of the accommodating groove, and the communicating hole is communicated with the accommodating groove and the accommodating cavity. The first end of the tab is fixed to the electrode assembly, and the second end of the tab extends out of the shell through the communicating hole and the containing groove. The sealant is arranged in the containing groove. According to the hard-shell battery cell provided by the embodiment of the invention, the assembly complexity of the current hard-shell battery cell can be reduced.

Description

[Technical field]

[0001] The embodiments of the present application relate to the field of battery technology, and in particular to a hard shell battery cell and an electrical device. [Background technology]

[0002] A battery cell is a device that converts external energy into electrical energy and stores it inside to power external devices (such as portable electronic devices) when needed. Currently, battery cells are widely used in electronic products such as mobile phones, tablets, and laptops.

[0003] Generally, battery cells are divided into soft-pack battery cells and hard-shell battery cells. Among them, the hard-shell battery cell includes a shell, an electrode assembly, a pole and an electrolyte filled in the shell. The shell is provided with a receiving cavity; the electrode assembly is received in the receiving cavity, and includes a first pole piece and a second pole piece with opposite polarities, and an isolation membrane provided between the first pole piece and the second pole piece. One of the first pole piece and the second pole piece is electrically connected to the shell through a conductive sheet, so that the shell forms a conductive terminal of the hard-shell battery cell; one end of the pole piece is provided in the receiving cavity, and the other of the first pole piece and the second pole piece is electrically connected to the one end, and the other end of the pole piece extends out of the shell, so that the pole piece forms another conductive terminal of the hard-shell battery cell.

[0004] At present, the poles of hard-shell batteries are clamped on the shell by riveting, and the assembly process is complicated, which in turn makes the overall assembly process of the hard-shell batteries complicated; at the same time, in order to avoid electrical contact between the poles and the shell, it is also necessary to embed multiple insulating parts between the poles and the shell, which further increases the complexity of the hard-shell battery assembly process. [Summary of the invention]

[0005] The embodiments of the present application are intended to provide a hard shell battery cell and an electrical device to reduce the complexity of current hard shell battery cell assembly.

[0006] The embodiment of the present application solves the technical problem by adopting the following technical solutions:

[0007] A hard shell battery cell, comprising an insulating shell, an electrode assembly, a pole ear and a sealant. The shell is provided with a receiving cavity. The electrode assembly is received in the receiving cavity. The shell is provided with a through hole for the pole ear to pass through, the through hole comprising a receiving groove and a connecting hole, the outer surface of the shell is concave to form the receiving groove, the cross-sectional profile of the end of the receiving groove away from the receiving cavity is larger than the cross-sectional profile of the end close to the receiving cavity, and the connecting hole connects the receiving groove and the receiving cavity respectively. The first end of the pole ear is fixed to the electrode assembly, and the second end of the pole ear extends out of the shell via the connecting hole and the receiving groove in turn. The sealant is provided in the receiving groove.

[0008] Compared with the hard shell battery cells currently on the market, the hard shell battery cells provided in the embodiments of the present application no longer use a pole structure, but instead use a pole ear structure, and seal the connection between the pole ear and the shell with a sealant, which does not require specific riveting equipment, so the process of injecting glue is simpler than the riveting process and embedding insulating parts. In addition, the hard shell battery cell can also save the insulating part originally sleeved on the pole, and the process of sleeved the insulating part on the pole. Therefore, the hard shell battery cell provided in the embodiments of the present application can reduce the complexity of the current hard shell battery cell assembly.

[0009] As a further improvement of the above technical solution, the receiving groove includes a first groove and a second groove. The outer surface of the shell is concave to form the first groove, and the bottom wall of the first groove is concave to form the second groove; the connecting holes respectively connect the second groove and the receiving cavity. Since the second groove as a whole surrounds the port facing the connecting hole, and the first groove as a whole surrounds the second groove; therefore, when the electrode assembly with the welded pole ear is assembled into the shell, the second end of the pole ear can smoothly and naturally pass through the above-mentioned connecting hole, the second groove and the first groove in turn, and extend out of the shell. At the same time, the setting of the first groove and the second groove facilitates the visual control of the amount of the first adhesive layer and the second adhesive layer, and facilitates the quantification of the two adhesive layers when they are used.

[0010] As a further improvement of the above technical solution, the sealant includes a first glue layer and a second glue layer. The first glue layer is filled in the second groove, the second glue layer is filled in the first groove, and the viscosity of the first glue layer in a fluid state is greater than the viscosity of the second glue layer in a fluid state.

[0011] As a further improvement of the above technical solution, the connecting hole extends from the bottom wall of the second groove to the receiving cavity.

[0012] As a further improvement of the above technical solution, a guide groove is provided at one end of the connecting hole close to the receiving cavity. The cross-sectional profile of the guide groove gradually expands from the end away from the receiving cavity to the end close to the receiving cavity. In this way, in the process of the pole ear extending into the through hole, even if it is not completely aligned with the central area of ​​the through hole, but falls on the guide groove area, it will gradually slide into the central area of ​​the through hole and pass through the through hole under the guidance of the guide groove. That is, the setting of the guide groove can reduce the risk of the pole ear being easily damaged when the hard shell battery cell is assembled with the pole ear; at the same time, it improves the fault tolerance rate when assembling the pole ear and reduces the difficulty of assembling the pole ear.

[0013] As a further improvement of the above technical solution, the side wall of the guide groove includes a first side wall unit. From an end away from the receiving cavity to an end close to the receiving cavity, the first side wall unit gradually moves away from the pole ear and extends in a straight line or an arc.

[0014] As a further improvement of the above technical solution, the side wall of the guide groove includes a second side wall unit arranged opposite to the first side wall unit. From one end away from the receiving cavity to one end close to the receiving cavity, the second side wall unit gradually moves away from the pole lug and extends in a straight line or an arc; or, from one end away from the receiving cavity to one end close to the receiving cavity, the second side wall unit extends parallel to the pole lug.

[0015] As a further improvement of the above technical solution, the side wall of the guide groove further includes a third side wall unit and a fourth side wall unit, and the first side wall unit, the third side wall unit, the second side wall unit and the fourth side wall unit are connected in sequence. From one end away from the receiving cavity to one end close to the receiving cavity, the third side wall unit and / or the fourth side wall unit gradually move away from the pole ear and extend in a straight line or an arc; or, from one end away from the receiving cavity to one end close to the receiving cavity, the distance between the third side wall unit and / or the fourth side wall unit and the pole ear remains constant.

[0016] As a further improvement of the above technical solution, the tab has a main surface defined by a long side and a wide side, and the first side wall unit is arranged toward the main surface.

[0017] As a further improvement of the above technical solution, the portion of the pole ear extending out of the shell is laid flat on the surface of the shell, thereby reducing the overall occupied volume of the hard shell battery cell.

[0018] As a further improvement of the above technical solution, the shell includes a base shell portion, a first end wall and a second end wall. The base shell portion is provided with the receiving cavity, and the receiving cavity extends through the base shell portion along a preset direction. The first end wall covers one end of the receiving cavity, and the first end wall is provided with the through hole. The second end wall covers the other end of the receiving cavity.

[0019] As a further improvement of the above technical solution, the hard shell battery cell includes at least two pole ears, the first end wall is provided with a plurality of the through holes, and each pole ear corresponds to one through hole; or, the hard shell battery cell includes at least two pole ears, and at least two pole ears extend out of the shell from the same through hole.

[0020] As a further improvement of the above technical solution, the first end of the pole ear is close to the inner wall of the base shell portion, and the through hole is arranged close to the edge of the first end wall.

[0021] As a further improvement of the above technical solution, the first end wall and the base shell portion are integrally formed; the second end wall and the base shell portion are fixed by welding or bonding.

[0022] As a further improvement of the above technical solution, the second end wall is provided with an annular boss portion on the side away from the first end wall, and when observed from the direction from the second end wall to the first end wall, there is an overlapping area between the welding area of ​​the base shell portion and the second end wall and the boss portion. The second end wall and the base shell portion are fixed by ultrasonic welding. When welding the second end wall and the base shell portion, the probe of the ultrasonic welding device can be pressed on the boss portion; then the ultrasonic wave emitted from the ultrasonic welding device will be concentrated on the boss portion, and propagate to the above-mentioned sharp portion through the boss portion, so as to form the above-mentioned structure after welding. In contrast, if the boss portion is not provided, the probe of the ultrasonic welding device will be directly pressed on the surface of the second end wall, and the ultrasonic wave emitted by it will easily diffuse to other parts, and the energy that finally reaches the above-mentioned sharp portion and causes the sharp portion to melt is less, which leads to lower welding efficiency.

[0023] As a further improvement of the above technical solution, one end of the base shell portion facing the second end wall is concave to form an installation cavity, and the installation cavity is connected to the receiving cavity and is arranged around the receiving cavity. The installation cavity includes a first cavity, and the inner wall surface of the first cavity includes a first installation surface, the first installation surface is inclined relative to the preset direction, and extends around the receiving cavity in a closed state. The second end wall is installed in the installation cavity and is provided with a second installation surface, and the second installation surface is fixed to the first installation surface. In this way, during the assembly process of the base shell portion and the second end wall, the second end wall installed in the installation cavity will not slide out of the base shell portion under the restriction of the installation cavity. That is, the hard shell battery cell can reduce the risk that the shell of the current hard shell battery cell cannot be assembled normally.

[0024] As a further improvement of the above technical solution, a cross-sectional profile of the first mounting surface gradually expands along a direction from the first end wall to the second end wall.

[0025] As a further improvement of the above technical solution, the installation cavity further includes a second cavity, and the first cavity extends from the side of the first end wall to the end surface of the base shell portion to form the second cavity. The second end wall includes a main body and a filling portion surrounding the side wall of the main body, the filling portion is formed by melting part of the material of the main body and flowing to surround the main body, and the filling portion is filled between the main body and the side wall of the second cavity.

[0026] As a further improvement of the above technical solution, the installation cavity further includes a third cavity. The third cavity is arranged on the side of the first cavity facing the first end wall and is connected to the first cavity, and the first installation surface surrounds the third cavity. The excess fluid generated by the second end wall during the ultrasonic welding process will first flow into the third cavity, thereby reducing the risk of the fluid directly flowing into the receiving cavity.

[0027] As a further improvement of the above technical solution, the shell includes plastic, and the shell includes at least one of the following materials: liquid crystal polymer, parahydroxybenzaldehyde, polyester resin, polyvinyl chloride, polyimide, ABS plastic, polycarbonate, polyamide and polypropylene.

[0028] As a further improvement of the above technical solution, the hard shell battery cell includes a button battery cell.

[0029] An embodiment of the present application also provides an electrical device, which includes the hard shell battery cell described in any one of the above items.

Brief Description of the Drawings

[0030] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0031] Figure 1 A three-dimensional schematic diagram of a hard shell battery cell provided in one embodiment of the present application;

[0032] Figure 2 for Figure 1 Top view of the medium hard shell battery cell;

[0033] Figure 3 for Figure 2 Schematic diagram of the cross section of the medium hard shell battery along the AA line;

[0034] Figure 4 for Figure 2 Schematic diagram of the cross section of the medium hard shell battery along the BB line;

[0035] Figure 5 for Figure 3 Schematic diagram of the section at C in the middle;

[0036] Figure 6 A partially enlarged schematic diagram of a housing provided in another embodiment of the present application;

[0037] Figure 7 A partial enlarged schematic diagram of a housing provided in yet another embodiment of the present application;

[0038] Figure 8 for Figure 3 A partial enlarged schematic diagram of point D in the middle;

[0039] Fig. 9 for Figure 4 A partial enlarged schematic diagram of point E in the middle;

[0040] Fig.10 for Figure 4 A partial enlarged schematic diagram of point F in the middle;

[0041] Fig.11 A schematic diagram of an electrical device provided in one embodiment of the present application.

[0042] In the figure:

[0043] 1. Hard shell battery;

[0044] 100, housing; 110, base shell portion; 120, first end wall; 130, second end wall; 131, second mounting surface; 132, boss portion; 101, receiving cavity; 102, mounting cavity; 103, first cavity; 1031, first mounting surface; 104, second cavity; 105, third cavity; 106, through hole; 107, receiving groove; 108, communicating hole; 1071, first groove; 1072, second groove; 1081, guide groove; 10811, first side wall unit; 10812, second side wall unit; 10813, third side wall unit; 10814, fourth side wall unit;

[0045] 200. Electrode assembly;

[0046] 300, terminal ear; 310, first end; 320, second end;

[0047] 400, sealant; 410, first adhesive layer; 420, second adhesive layer;

[0048] 100b, housing; 110b, base housing; 130b, second end wall; 131b, second mounting surface; 102b, mounting cavity; 1031b, first mounting surface;

[0049] 100c, housing; 110c, base housing portion; 130c, second end wall; 102c, mounting cavity;

[0050] 2. Electrical equipment. [Specific implementation method]

[0051] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" / "fixed to" / "installed on" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0052] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0053] In addition, 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.

[0054] In this specification, the term "installation" includes fixing or restricting a component or device to a specific position or place by welding, screwing, clamping, bonding, etc. The component or device may remain stationary at the specific position or place or move within a limited range. After being fixed or restricted to a specific position or place, the component or device may or may not be disassembled, which is not limited in the embodiments of the present application.

[0055] Please read first Figures 1 to 4 , which respectively show a three-dimensional schematic diagram, a top view, a cross-sectional schematic diagram of the hard shell battery 1 along the AA line, and a cross-sectional schematic diagram of the hard shell battery 1 along the BB line provided by one embodiment of the present application, wherein the hard shell battery 1 comprises a shell 100, an electrode assembly 200, a tab 300, and a sealant 400. Among them, the shell 100 is a mounting base of the hard shell battery 1, and is provided with a receiving cavity 101. The electrode assembly 200 is received in the receiving cavity 101. The first end 310 of the tab 300 is fixed to the electrode assembly 200, and the second end 320 of the tab 300 extends out of the shell 100; accordingly, the shell 100 is provided with a through hole 106 for the tab 300 to pass through. The sealant 400 is disposed in the above-mentioned through hole 106 and blocks the through hole. Next, taking the hard shell battery cell 1 as a button battery cell as an example, the above structures are explained in turn; however, it should be understood that in other embodiments of the present application, the hard shell battery cell 1 can also be a square battery cell, or other irregularly shaped battery cells.

[0056] For the above-mentioned housing 100, please refer to Figure 3 , and in combination with other drawings, the shell 100 is provided with a receiving cavity 101 for receiving the electrode assembly 200, part of the tab 300 and the electrolyte. In this embodiment, the shell 100 is generally a columnar structure, which includes a base shell portion 110, a first end wall 120 and a second end wall 130. Specifically, the base shell portion 110 is a cylindrical structure, which is provided with a receiving cavity 101 that passes through the base shell portion 110 along the preset direction X shown in the figure. The first end wall 120 covers one end of the receiving cavity 101 and is fixed to the above-mentioned base shell portion 110. In this embodiment, the first end wall 120 and the base shell portion 110 are integrally formed, for example, integrally formed by injection molding; of course, in other embodiments of the present application, the first end wall 120 and the base shell portion 110 can also be fixed by other methods such as bonding, ultrasound, etc. The second end wall 130 is arranged opposite to the first end wall 120, and covers the other end of the receiving cavity 101. Optionally, the second end wall 130 is fixed to the base shell 110 by ultrasonic welding; it is understood that in other embodiments of the present application, the second end wall 130 can also be fixed to the base shell 110 by any other practicable methods such as welding or bonding, and the present application does not specifically limit it. As for the material of the shell 100, it is made of insulating material in the present embodiment; on the one hand, it is conducive to preventing the two polarity pole pieces in the electrode assembly 200 from short-circuiting through the shell 100, and on the other hand, it can also help to avoid short-circuiting between the pole ears 300 extending through the shell 100. Optionally, the material of the shell 100 includes plastic, for example, it includes at least one of the following materials: liquid crystal polymer, p-hydroxybenzaldehyde, polyester resin, polyvinyl chloride, polyimide, ABS plastic, polycarbonate, polyamide and polypropylene, wherein "ABS plastic" refers to a terpolymer of three monomers of acrylonitrile, butadiene and styrene, and the relative content of the three monomers can be arbitrarily changed to make various resins; of course, in other embodiments of the present application, the shell 100 can also include other insulating materials such as rubber. It is worth noting that the “preset direction” mentioned in the present application refers to the extension direction of the receiving cavity 101 , that is, the direction in which one of the first end wall 120 and the second end wall 130 points to the other.

[0057] During the process of welding the second end wall 130 to the base shell 110, the second end wall 130 is relatively disposed above the base shell 110. However, even so, the second end wall 130 may still slide relative to the base shell 110 to the edge beyond the base shell 110 during the process. To overcome this drawback, the base shell 110 is further provided with a mounting cavity 102. For details, please refer to Figure 5 , which shows Figure 3In the cross-sectional schematic diagram at C in the middle, combined with other drawings, one end of the base shell portion 110 facing the second end wall 130 is concave at the outer edge of the receiving cavity 101 to form the above-mentioned installation cavity 102, and the installation cavity 102 is connected with the receiving cavity 101 and is arranged around the receiving cavity 101. More specifically, the installation cavity 102 includes a first cavity 103, and the inner wall surface of the first cavity 103 has a first installation surface 1031 inclined relative to the above-mentioned preset direction X; along the direction of the first end wall 120 pointing to the second end wall 130 (i.e. Figure 5 The cross-sectional profile of the first mounting surface 1031 gradually expands (in the direction from top to bottom in the figure). Accordingly, the second end wall 130 extends into the mounting cavity 102, and has a second mounting surface 131 which is also tilted relative to the preset direction X, and the second mounting surface 131 is fixed to the first mounting surface 1031. In this way, the first cavity 103 can, on the one hand, position and limit the second end wall 130 when the second end wall 130 is installed, so as to prevent the second end wall 130 from sliding out of the base shell 110; on the other hand, the first mounting surface 1031 and the second mounting surface 131 are fitted in a tilted manner relative to the preset direction X, so as to increase the connection area between the base shell 110 and the second end wall 130, thereby strengthening the connection strength between the two. Preferably, the first mounting surface 1031 and the second mounting surface 131 extend around the receiving cavity 101 to form a closed ring; this setting is intended to enable the second end wall 130 to be installed in the mounting cavity 102 at any angle around the axis of the first mounting surface 1031, without rotating to a specific angle for installation. Generally, a good installation effect can be achieved when the angle between the first mounting surface 1031 and the preset direction X is between 10° and 80°; when the angle is between 40° and 60°, the installation effect of the second end wall 130 will be better. More preferably, the mounting cavity 102 also includes a second cavity 104, and the side of the first cavity 103 away from the first end wall 120 extends to the end surface of the base shell part 110 to form the second cavity 104; that is, the second cavity 104 and the first cavity 103 are sequentially arranged and connected along the direction from the second end wall 130 to the first end wall 120. In this way, the side wall of the second cavity 104 can further constrain the second end wall 130. It is worth noting that the above specific description reflects the state after the second end wall 130 and the base shell part 110 are assembled. However, before the second end wall 130 is assembled to the base shell part 110, the end of the second end wall 130 facing the base shell part 110 can actually be sharp. Figure 5In the process of ultrasonic welding, the sharp part shown by the dotted line melts and forms the grid-like part shown in the figure and the second mounting surface 131 under the guidance of the first mounting surface 1031. The second mounting surface 131 connects the end surface of the second end wall 130 facing the first end wall 120 and the side surface of the second end wall 130. In other words, the second end wall 130 includes a main body and a side wall surrounding the main body and forming a Figure 5 The mesh-shaped filling part is shown; wherein the filling part is formed by melting part of the material of the main body and flowing to surround the main body, which constitutes the side wall of the second end wall 130, and the filling part is filled between the main body and the side wall of the second cavity 104; the second cavity 104 can accommodate the melted material of the second end wall 130 during the welding process of the second end wall 130, thereby preventing the melted material from overflowing to the outer surface of the base shell part 110 to a certain extent. In addition, in other embodiments, the above-mentioned filling part can also be formed by curing the adhesive instead of melting the main body.

[0058] It is worth mentioning that even though the mounting cavity 102 in this embodiment is disposed on the base shell portion 110 and the contour of the first mounting surface 1031 gradually expands along the direction from the first end wall 120 to the second end wall 130, the present application is not limited thereto. Figure 6 A partial enlarged schematic diagram of a housing 100b provided in another embodiment of the present application is shown (the enlarged area can be referred to in Figure 5 ), the shell 100b still includes a base shell portion 110b, a first end wall and a second end wall 130b. The base shell portion 110b is provided with the above-mentioned installation cavity 102b. The main difference between the shell 100b and the shell 100 in the above-mentioned embodiment is that the inner wall of the installation cavity 102b includes a first installation surface 1031b, and the contour of the first installation surface 1031b gradually shrinks along the direction from the above-mentioned first end wall to the second end wall 130b; correspondingly, the contour of the second installation surface 131b also gradually shrinks along this direction. Since the first installation surface 1031b and the side wall of the installation cavity 102b form a groove structure, the shell 100b can omit the third cavity mentioned below. For another example, Figure 7 A partial schematic diagram of a housing 100c provided in another embodiment of the present application is shown (the enlarged area can still be referred to Figure 5 ), the housing 100c still includes a base housing portion 110c, a first end wall and a second end wall 130c. The main difference between the housing 100c and the housing 100 in the above embodiment is that the second end wall 130b is provided with the above-mentioned installation cavity 102b, and the base housing portion 110b is installed in the installation cavity 102b.

[0059] Since the second end wall 130 is facing upward and the first end wall 120 is facing downward during the welding process, the fluid formed by the melting of the second end wall 130 may flow into the receiving cavity 101. To overcome this drawback, the installation cavity 102 further includes a third cavity 105. Specifically, the third cavity 105 is disposed on the side of the first cavity 103 facing the first end wall 120 and is connected to the first cavity 103; then, the excess fluid generated by the second end wall 130b during the ultrasonic welding process will first flow into the third cavity 105, thereby reducing the risk of the fluid directly flowing into the receiving cavity 101. In the present embodiment, one end of the first mounting surface 1031 close to the first end wall 120 is just connected to the side wall of the third cavity 105, that is, the first mounting surface 1031 is arranged around the third cavity 105; this arrangement can be beneficial to the molding of the base shell portion 110; for example, when the base shell portion 110 is molded by injection molding, the above arrangement helps to demold when opening the mold; for another example, when the base shell portion 110 is molded by cutting, the above arrangement facilitates the cutting tool to sequentially mold the second cavity 104, the first cavity 103 and the third cavity 105.

[0060] Furthermore, in order to improve the welding efficiency during the ultrasonic welding process between the second end wall 130 and the base shell part 110, a circular boss part 132 is provided on the side of the second end wall 130 away from the first end wall 120. Specifically, when observing from the direction of the second end wall 130 pointing to the first end wall 120, the first mounting surface 1031, the second mounting surface 131 and the boss part 132 have overlapping areas; that is, there is an overlapping area between the welding area of ​​the second end wall 130 and the base shell part 110 and the boss part 132. When welding the second end wall 130 and the base shell part 110, the probe of the ultrasonic welding device can be pressed on the boss part 132; then the ultrasonic wave emitted from the ultrasonic welding device will be concentrated on the boss part 132, and propagate to the above-mentioned sharp part through the boss part 132, so as to form the above-mentioned structure after welding. In contrast, if the boss portion 132 is not provided, the probe of the ultrasonic welding device will be directly pressed against the surface of the second end wall 130, and the ultrasonic waves emitted by it will easily diffuse to other parts, and ultimately less energy will reach the above-mentioned sharp portion and cause the sharp portion to melt, thereby resulting in lower welding efficiency.

[0061] It should be understood that even though the base shell portion 110 and the first end wall 120 in the shell 100 of the present embodiment are integrally formed and fixed to the second end wall 130 via ultrasonic welding, in other embodiments of the present application, adaptive deformation can also be made on this basis, as long as the above three together form a receiving cavity 101; some of the implementation methods are described below. For example, in some embodiments, the first end wall 120 and the second end wall 130 are both welded and fixed to the base shell portion 110. For example, in other embodiments, the base shell portion 110 includes a first part and a second part, and the first part and the second part are welded and fixed along the above-mentioned preset direction X; the first end wall 120 is provided at one end of the first part away from the second part, and the second end wall 130 is provided at one end of the second part away from the first part. For example, in some other embodiments, the base shell portion 110 includes a first part, a second part and a third part, and the first part, the second part and the third part are connected and fixed in sequence along the above-mentioned preset direction X; the first end wall 120 is arranged at an end of the first part away from the third part, and the second end wall 130 is arranged at an end of the second part away from the first part.

[0062] For the electrode assembly 200, please refer to Figure 3 , and in combination with other drawings, the electrode assembly 200 is the core component of the hard shell battery 1, which is accommodated in the shell 100. In this embodiment, the electrode assembly 200 is a winding structure, which includes a first pole piece (not shown in the figure) and a second pole piece (not shown in the figure) arranged in a stacked manner, and an isolation film (not shown in the figure) arranged between the two to separate the two; the first pole piece, the second pole piece and the isolation film are wound in a stacked state into a cylindrical shape so as to be accommodated in the above-mentioned accommodation cavity 101. It can be understood that in other embodiments of the present application, the electrode assembly 200 can also be a stacked structure, and the present application does not limit its specific form.

[0063] For the above-mentioned tab 300, please refer to Figure 8 , which shows Figure 3 The local enlarged schematic diagram of D in the middle, combined with Figure 3, the first end 310 of the tab 300 is connected to the outer ring of the electrode assembly 200, that is, the tab 300 is arranged near the inner wall of the base shell 110, and the second end 320 of the tab 300 passes through the first end wall 120 and extends out of the shell 100 to form an external conductive terminal of the hard shell battery 1. Correspondingly, the first end wall 120 is provided with a through hole 106 for the tab 300 to pass through, and the through hole 106 is arranged near the edge of the first end wall 120. In this embodiment, the through hole 106 includes a receiving groove 107 and a connecting hole 108; the outer surface of the first end wall 120 is concave to form the receiving groove 107, and the connecting hole 108 is connected to the receiving groove 107 and the receiving cavity 101 respectively. Among them, the receiving groove 107 is used to receive the sealant 400, so that after the tab 300 extends out of the connecting hole 108, the connecting hole 108 is blocked, thereby preventing the electrolyte in the receiving cavity from overflowing outward through the through hole 106. Preferably, in order to reduce the overall occupied volume of the hard shell battery cell 1 , the portion of the tab 300 extending out of the first end wall 120 is bent to be flush with the surface of the first end wall 120 .

[0064] In this embodiment, the cross-sectional profile of the end of the receiving groove 107 away from the receiving cavity 101 is larger than the cross-sectional profile of the end thereof close to the receiving cavity 101. Specifically, the receiving groove 107 includes a first groove 1071 and a second groove 1072. The outer surface of the first end wall 120 is concave to form the first groove 1071, and the bottom wall of the first groove 1071 is concave to form the second groove 1072; the above-mentioned connecting hole 108 connects the second groove 1072 and the receiving cavity 101 respectively. Since the second groove 1072 is entirely surrounding the port facing the connecting hole 108, and the first groove 1071 is entirely surrounding the second groove 1072; therefore, when the electrode assembly 200 with the electrode tab 300 welded is assembled into the shell 100, the second end 320 of the electrode tab 300 can smoothly and naturally pass through the above-mentioned connecting hole 108, the second groove 1072 and the first groove 1071 in sequence, and extend out of the shell 100. Optionally, the cross-sectional profile of the first groove 1071 and / or the second groove 1072 perpendicular to the preset direction X is elliptical; of course, in other embodiments of the present application, the cross-sectional profile may also be rectangular, arc-shaped or other shapes.

[0065] In this embodiment, the hard shell battery cell 1 includes two tabs 300; one tab 300 is connected to the first pole piece and extends out of the housing 100 through the through hole 106, and the other tab 300 is connected to the second pole piece and extends out of the housing 100 through another through hole 106. The two through holes 106 are spaced apart along the circumferential direction of the first end wall 120. It can be understood that even in this embodiment, the hard shell battery cell 1 includes two tabs 300, and each tab 300 corresponds to a through hole 106, but the present application is not limited thereto; other embodiments of the present application can also be adaptively adjusted on this basis. For example, in some embodiments, the hard shell battery cell 1 may also include more than three pole ears 300, and each pole ear 300 extends out of the shell 100 through a through hole 106; for example, in other embodiments, the hard shell battery cell 1 still includes two pole ears 300, but the two pole ears 300 extend out of the shell through the same through hole 106. At this time, it should be noted that the gap between the two pole ears 300 should be ensured to be greater than 0.1 millimeters (mm); for example, in some other embodiments, the hard shell battery cell 1 includes more than three pole ears 300, and at least two pole ears 300 extend out of the shell 100 through the same through hole 106.

[0066] It is worth noting that in other embodiments of the present application, the tab 300 may extend out of the shell 100 from the second end wall 130 or the base shell portion 110 instead of the first end wall 120 ; and the shell 100 is provided with the above-mentioned through hole 106 at the corresponding position.

[0067] For the above sealant 400, please continue to see Figure 8, and in combination with other drawings, the sealant 400 is filled in the above-mentioned receiving groove 107. In this embodiment, the sealant 400 includes a first glue layer 410 filled in the second groove 1072 and a second glue layer 420 filled in the first groove 1071. Among them, in the fluid state that has not yet solidified, the viscosity of the second glue layer 420 is less than the viscosity of the first glue layer 410. When filling the first glue layer 410, the first glue layer 410 in the fluid state can fill the second groove 1072 at a faster speed and flow into the gap between the connecting hole 108 and the tab 300; of course, it is also necessary to prevent the first glue layer 410 from flowing into the above-mentioned receiving cavity 101. That is, the first glue layer 410 mainly plays the role of filling and pre-sealing. The second glue layer 420 is filled into the first groove 1071 after the first glue layer 410 is basically solidified; its viscosity is relatively high, so it can play a sealing effect on the one hand, and on the other hand, it can also provide a better fixing effect for the housing 100 and the tab 300. It is worth mentioning that the arrangement of the first groove 1071 and the second groove 1072 facilitates visual control of the amount of the first adhesive layer 410 and the second adhesive layer 420, and facilitates the quantification of the two adhesive layers when in use. As for the materials of the first adhesive layer 410 and the second adhesive layer 420, they can be the same or different; when the materials of the two adhesive layers are the same, the ratio of the components in the two adhesive layers can be adjusted to achieve the effect of making the viscosity of the two adhesive layers different. In some embodiments, the first adhesive layer 410 and / or the second adhesive layer 420 include at least one of epoxy resin, phenolic resin, polyurethane and polyimide; of course, in other embodiments, the first adhesive layer 410 and / or the second adhesive layer 420 can also be made of other materials. In addition, in other embodiments of the present application, the sealant 400 can also include only one adhesive layer, such as only the first adhesive layer 410 or the second adhesive layer 420.

[0068] Furthermore, in order to facilitate the above-mentioned pole ear 300 to smoothly pass through the above-mentioned connecting hole 108, the connecting hole 108 is provided with a guide groove 1081 at one end close to the receiving cavity 101. Specifically, the cross-sectional profile of the end of the guide groove 1081 away from the receiving cavity 101 is slightly larger than the cross-sectional profile of the pole ear 300, so as to facilitate the pole ear 300 to pass through; and the cross-sectional profile of the guide groove 1081 gradually expands from the end away from the receiving cavity 101 to the end close to the receiving cavity 101, so that the second end 320 of the pole ear 300 can smoothly pass through the connecting hole 108 under the guidance of the guide groove 1081 when it just extends into the connecting hole 108. More specifically, in combination with Figures 8 to 10 ,in Fig. 9 and Fig.10 They are shown respectively Figure 4In the partial enlarged schematic diagram at E and F, the side wall of the guide groove 1081 includes a first side wall unit 10811 and a second side wall unit 10812 arranged opposite to the main surface of the pole tab 300, and a third side wall unit 10813 and a fourth side wall unit 10814 arranged opposite to the side surface of the pole tab 300; that is, the first side wall unit 10811 is arranged opposite to the second side wall unit 10812, and the third side wall unit 10813 is arranged opposite to the fourth side wall unit 10814. The first side wall unit 10811, the third side wall unit 10813, the second side wall unit 10812 and the fourth side wall unit 10814 are connected in sequence and together form the above-mentioned connecting hole 108. Among them, the "main surface" mentioned in the present application is a surface jointly defined by the long side and the wide side of the pole ear 300, the above-mentioned first side wall unit 10811 is set toward one main surface, and the second side wall unit 10812 is set toward the other main surface; the "side surface" mentioned in the present application is a surface jointly defined by the long side and the thickness side of the pole ear 300.

[0069] In this embodiment, the first side wall unit 10811 gradually moves away from the pole ear 300 from the end away from the receiving cavity 101 to the end close to the receiving cavity 101, and extends in an arc shape, that is, the first side wall unit 10811 itself constitutes a structure similar to an inverted circle. At the same time, the inner wall of the base shell portion 110 and the first end wall 120 are transitioned through an arc surface, and the arc surface is connected to the first side wall unit 10811. In this way, when the electrode assembly 200 with the pole ear 300 is assembled into the receiving cavity, the pole ear 300 can be roughly aligned with the guide groove 1081, and the pole ear 300 can be attached to or close to the inner wall of the base shell portion 110; when the electrode assembly 200 continues to be extended into the receiving cavity 101, the pole ear 300 will smoothly pass through the first end wall 120 under the guidance of the arc surface and the guide groove 1081. Of course, in other embodiments of the present application, the first side wall unit 10811 may also extend in a straight line; accordingly, the inner wall of the base shell portion and the first end wall may also transition through an inclined surface, and the inclined surface is connected to the first side wall unit 10811. Similarly, the second side wall unit 10812 gradually moves away from the tab 300 from the end away from the receiving chamber 101 to the end close to the receiving chamber 101, and extends in a straight line; of course, in other embodiments of the present application, the second side wall unit 10812 may also extend in an arc shape. The third side wall unit 10813 also gradually moves away from the tab 300 from the end away from the receiving chamber 101 to the end close to the receiving chamber 101, and extends in a straight line; of course, in other embodiments of the present application, the second side wall unit 10812 may also extend in an arc shape. Similarly, the fourth side wall unit 10814 also gradually moves away from the tab 300 from the end away from the receiving cavity 101 to the end close to the receiving cavity 101, and extends in a straight line; of course, in other embodiments of the present application, the fourth side wall unit 10814 may also extend in an arc shape. The arrangement of the first side wall unit 10811, the second side wall unit 10812, the third side wall unit 10813, and the fourth side wall unit 10814 can improve the fault tolerance of the tab 300 passing through the first end wall 120. In addition, the second end 320 of the tab 300 can also be adaptively provided with a rounded corner or a chamfered corner to further improve the smoothness of the tab 300 passing through the through hole 106. It should be understood that even though the first to fourth side wall units in the present embodiment are gradually away from the pole ear 300 along the above-mentioned direction, the present application is not limited to this, as long as one of them has the above-mentioned characteristics; in other embodiments of the present application, the first to fourth side wall units can be one, two or three of which keep a constant distance from the pole ear 300 along the above-mentioned direction.

[0070] The hard shell battery cell 1 provided in the embodiment of the present application includes an insulating shell 100, an electrode assembly 200, a tab 300 and a sealant 400. Among them, the electrode assembly 200 is accommodated in the shell 100. The first end 310 of the tab 300 is fixed to the electrode assembly 200, and the second end 320 passes through the shell 100 and extends out of the shell. Correspondingly, the shell 100 is provided with a through hole 106 for the tab 300 to pass through, and the through hole 106 includes a receiving groove 107 and a connecting hole 108. Among them, the receiving groove 107 is formed concave from the outer surface of the shell 100, and the cross-sectional profile of the end of the receiving groove 107 away from the receiving cavity 101 is larger than the cross-sectional profile of the end close to the receiving cavity 101; the connecting hole 108 connects the receiving groove 107 and the receiving cavity 101 respectively; the second end 320 of the above-mentioned tab 300 extends out of the shell 100 through the connecting hole 108 and the receiving groove 107 in turn. The sealant 400 is disposed in the receiving groove 107 to seal the communicating hole 108 and fix the tab 300 to the housing 100 .

[0071] Compared with the hard shell battery cells currently on the market, the hard shell battery cell 1 provided in the embodiment of the present application no longer uses a pole structure, but instead uses a pole ear 300 structure; at the same time, the hard shell battery cell 1 seals the connection between the pole ear 300 and the shell 100 through a sealant 400, which does not require specific riveting equipment, so the process of injecting glue is simpler than the riveting process and embedding insulating parts. In addition, the hard shell battery cell 1 can also save the insulating part originally sleeved on the pole, and the process of sleeved the insulating part on the pole. Therefore, the hard shell battery cell 1 provided in the embodiment of the present application can reduce the complexity of the current hard shell battery assembly.

[0072] At the same time, one of the base shell portion 110 and the second end wall 130 of the housing 100 is provided with the mounting cavity 102, and the other is mounted in the mounting cavity 102. In this way, during the assembly process of the base shell portion 110 and the second end wall 130, the structure (such as the second end wall) mounted in the mounting cavity 102 will not slide out of the structure (such as the base shell portion 110) provided with the mounting cavity 102 under the restriction of the mounting cavity 102. That is, the hard shell battery cell 1 provided in the embodiment of the present application can reduce the risk that the housing of the current hard shell battery cell 1 cannot be assembled normally.

[0073] At the same time, the through hole 106 on the shell 100 through which the tab 300 passes is provided with a guide groove 1081 at one end close to the receiving cavity 101; thus, when the tab extends into the through hole, even if it is not completely aligned with the central area of ​​the through hole but falls in the area of ​​the guide groove 1081, it will gradually slide into the central area of ​​the through hole 106 under the guidance of the guide groove 1081 and pass through the through hole 106. That is, the provision of the guide groove can reduce the risk of the tab 300 being easily damaged when the tab is assembled in the hard shell battery cell; at the same time, the fault tolerance rate of the tab 300 during assembly is improved, and the difficulty of assembling the tab 300 is reduced.

[0074] Based on the same inventive concept, another embodiment of the present application further provides an electrical device 2. For details, please refer to Fig.11 , while combining Figures 1 to 10 , the power device 2 includes the hard shell battery core 1 in the above embodiment. In this embodiment, the power device 2 is a mobile phone; it can be understood that in other embodiments of the present application, the power device 2 can also be a tablet computer, a computer, a drone or other power devices that need to be driven by electricity.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hard shell battery cell, characterized in that: include: An insulating shell is provided with a receiving cavity; An electrode assembly, housed in the housing cavity; A pole ear, the shell is provided with a through hole for the pole ear to pass through, the through hole includes a receiving groove and a communicating hole, the outer surface of the shell is concave to form the receiving groove, the cross-sectional profile of the end of the receiving groove away from the receiving cavity is larger than the cross-sectional profile of the end close to the receiving cavity, the communicating hole communicates with the receiving groove and the receiving cavity respectively, the first end of the pole ear is fixed to the electrode assembly, and the second end of the pole ear extends out of the shell through the communicating hole and the receiving groove, wherein the receiving groove includes a first groove and a second groove, the outer surface of the shell is concave to form the first groove, the bottom wall of the first groove is concave to form the second groove, the communicating hole communicates with the second groove and the receiving cavity respectively, and the communicating hole extends from the bottom wall of the second groove to the receiving cavity; as well as A sealant is disposed in the receiving groove to seal the communicating hole.

2. The hard shell battery cell according to claim 1, characterized in that: The sealant comprises a first adhesive layer and a second adhesive layer; The first adhesive layer is filled in the second groove, the second adhesive layer is filled in the first groove, and the viscosity of the first adhesive layer in a fluid state is greater than the viscosity of the second adhesive layer in a fluid state.

3. The hard shell battery cell according to claim 1, characterized in that: A guide groove is provided at one end of the communicating hole close to the receiving cavity; The cross-sectional profile of the guide groove gradually expands from an end away from the receiving cavity to an end close to the receiving cavity.

4. The hard shell battery cell according to claim 3, characterized in that: The side wall of the guide groove includes a first side wall unit; From an end away from the receiving cavity to an end close to the receiving cavity, the first side wall unit gradually moves away from the pole ear and extends in a straight line or an arc shape.

5. The hard shell battery cell according to claim 4, characterized in that: The side wall of the guide groove includes a second side wall unit arranged opposite to the first side wall unit; From an end away from the receiving cavity to an end close to the receiving cavity, the second side wall unit gradually moves away from the pole ear and extends in a straight line or an arc shape; or, The second side wall unit extends parallel to the tab from an end away from the receiving cavity to an end close to the receiving cavity.

6. The hard shell battery cell according to claim 5, characterized in that: The side wall of the guide groove further includes a third side wall unit and a fourth side wall unit, and the first side wall unit, the third side wall unit, the second side wall unit and the fourth side wall unit are connected in sequence; From one end away from the receiving cavity to one end close to the receiving cavity, the third side wall unit and / or the fourth side wall unit gradually move away from the pole ear and extend in a straight line or an arc shape; or, From an end away from the receiving cavity to an end close to the receiving cavity, a distance between the third side wall unit and / or the fourth side wall unit and the pole ear is kept constant.

7. The hard shell battery cell according to claim 4, characterized in that: The tab has a main surface defined by a long side and a wide side, and the first side wall unit is disposed toward the main surface.

8. The hard shell battery cell according to claim 1, characterized in that: The portion of the pole ear extending out of the shell is laid flat on the surface of the shell.

9. The hard shell battery cell according to any one of claims 1 to 8, characterized in that: The housing comprises: A base shell portion is provided with the receiving cavity, and the receiving cavity extends through the base shell portion along a preset direction; A first end wall, covering one end of the receiving cavity, wherein the first end wall is provided with the through hole; and The second end wall covers the other end of the receiving cavity.

10. The hard shell battery cell according to claim 9, characterized in that: The hard shell battery core comprises at least two tabs, the first end wall is provided with a plurality of through holes, and each tab corresponds to one through hole; or, The hard shell battery core includes at least two pole ears, and at least two of the pole ears extend out of the shell from the same through hole.

11. The hard shell battery cell according to claim 9, characterized in that: The first end of the pole ear is close to the inner wall of the base shell portion, and the through hole is arranged close to the edge of the first end wall.

12. The hard shell battery cell according to claim 11, characterized in that: The first end wall is integrally formed with the base shell portion; The second end wall and the base shell portion are fixed by welding or bonding.

13. The hard shell battery cell according to claim 12, characterized in that: The second end wall is provided with an annular boss portion on a side away from the first end wall, and when viewed from the direction from the second end wall to the first end wall, there is an overlapping area between the welding area of ​​the base shell portion and the second end wall and the boss portion; The second end wall and the base shell portion are fixed by ultrasonic welding.

14. The hard shell battery cell according to claim 12, characterized in that: One end of the base shell portion facing the second end wall is concave to form a mounting cavity, and the mounting cavity is communicated with the receiving cavity and is arranged around the receiving cavity; The installation cavity comprises a first cavity, the inner wall surface of the first cavity comprises a first installation surface, the first installation surface is arranged obliquely relative to the preset direction, and extends around the receiving cavity to form a closed shape; The second end wall is installed in the installation cavity and is provided with a second installation surface, and the second installation surface is fixed to the first installation surface.

15. The hard shell battery cell according to claim 14, characterized in that: Along the direction from the first end wall to the second end wall, the cross-sectional profile of the first mounting surface gradually expands.

16. The hard shell battery cell according to claim 15, characterized in that: The installation cavity further includes a second cavity, and a side of the first cavity facing away from the first end wall extends to an end surface of the base shell portion to form the second cavity; The second end wall includes a main body and a filling portion surrounding the side wall of the main body. The filling portion is formed by melting part of the material of the main body and flowing to surround the main body. The filling portion is filled between the main body and the side wall of the second cavity.

17. The hard shell battery cell according to claim 15, characterized in that: The installation cavity also includes a third cavity; The third cavity is disposed on a side of the first cavity facing the first end wall and is communicated with the first cavity. The first mounting surface surrounds the third cavity.

18. The hard shell battery cell according to any one of claims 1 to 8, characterized in that: The housing comprises plastic, and the plastic comprises at least one of the following materials: Liquid crystal polymer, polyester resin, polyvinyl chloride, polyimide, ABS plastic, polycarbonate, polyamide and polypropylene.

19. The hard shell battery cell according to any one of claims 1 to 8, characterized in that: The hard shell battery cell includes a button battery cell.

20. An electrical device, characterized in that: The invention comprises a hard shell battery core as claimed in any one of claims 1 to 19.

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