Pole, top cover assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a pole, a top cover assembly and a battery. According to the pole provided by the utility model, a tapered through hole is arranged at a limiting through hole of an outer pole, a tapered convex part is arranged at a limiting convex part of an inner pole, and during installation, the tapered convex part is put into the tapered through hole; and the outer wall surface of the tapering convex part abuts against the inner wall surface of the tapering through hole, so that the tapering convex part is tightly attached to the tapering through hole, namely, an air gap between the outer pole and the inner pole is avoided, the phenomena of poor welding such as pseudo soldering are avoided, the fault rate caused by poor contact of a circuit is reduced, and meanwhile, the service life of the circuit is prolonged. The influence of external factors such as vibration and temperature change can be resisted through stable welding, and the durability and reliability of the circuit are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pole, a top cover assembly and a battery. Background Art

[0002] Due to the advantages of secondary batteries such as high voltage, high specific energy, many cycles and long storage time, they are not only widely used in portable electronic devices such as mobile phones, digital cameras and laptops, but also widely used in large and medium-sized electric equipment such as electric vehicles, electric bicycles and power tools.

[0003] Specifically, a secondary battery includes a housing and a top cover assembly at the top opening of the housing. The top cover assembly includes a top cover and terminals, and the top cover is used to assemble the corresponding positive and negative terminals. In conventional solutions, the terminals include an outer terminal and an inner terminal. The outer terminal is located on the top cover and is electrically connected to the electrical device. The outer terminal is provided with a through hole, and the inner terminal is provided on an adapter plate. The inner terminal is provided with a terminal protrusion. During installation, the terminal protrusion is inserted into the through hole and welded to complete the electrical connection between the adapter plate and the top cover. However, since air gaps are easily formed between the outer and inner terminals after installation, the welding process may result in poor welding quality, such as cold welding, which can easily render the battery scrapped. Utility Model Content

[0004] In view of this, the utility model provides a pole, a top cover assembly and a battery to solve the problem of poor welding of the outer pole and the inner pole during the installation process.

[0005] In the first aspect, the utility model provides a pole, including an outer pole and an inner pole, the outer pole is provided with a limiting through hole; the inner pole is provided with a limiting protrusion, the limiting protrusion is inserted into the limiting through hole and then welded and fixed; wherein, in the direction of the outer pole away from the inner pole, the limiting through hole is at least partially a tapered through hole, the limiting protrusion is at least partially a tapered protrusion, and the outer wall surface of the tapered protrusion abuts against the inner wall surface of the tapered through hole.

[0006] Beneficial effect: By providing a tapered through-hole at the limiting through-hole of the outer pole and a tapered protrusion at the limiting protrusion of the inner pole, during installation, the tapered protrusion is placed into the tapered through-hole until the outer wall surface of the tapered protrusion abuts against the inner wall surface of the tapered through-hole, so that the tapered protrusion fits tightly with the tapered through-hole, that is, avoiding the occurrence of air gaps between the outer pole and the inner pole, and thus avoiding the occurrence of poor welding such as cold welding, reducing the failure rate of the circuit due to poor contact, and at the same time, through stable welding, it can resist the influence of external factors such as vibration and temperature changes, thereby improving the durability and reliability of the circuit.

[0007] In an optional embodiment, the outer pole is provided with an equal-diameter through hole, the radial dimension of the equal-diameter through hole is larger than the radial dimension of the tapered through hole close to the equal-diameter through hole, so as to form a step structure; the inner pole is provided with an equal-diameter protrusion, and the equal-diameter protrusion is inserted into the equal-diameter through hole.

[0008] Beneficial effects: By opening an equal-diameter through hole at the outer pole, and making the radial dimension of the equal-diameter through hole larger than the radial dimension of the tapered through hole close to the equal-diameter through hole, a step structure is formed; during installation, the equal-diameter protrusion is sequentially penetrated through the equal-diameter through hole and the tapered through hole at the opening of the equal-diameter through hole; and the setting of the step structure can also prevent welding slag from falling onto the battery cell during welding, thereby avoiding damage to the battery cell and improving welding quality.

[0009] In an optional embodiment, a protrusion extending along the central axis of the tapered protrusion is provided on the outer wall surface of the tapered protrusion, and a groove body adapted to the protrusion is provided on the inner wall surface of the tapered through hole, and the protrusion can at least partially extend into the groove body.

[0010] Beneficial Effects: By providing a protrusion on the outer wall of the tapered convex portion, and providing a slot on the inner wall of the tapered through-hole that fits the protrusion, with the protrusion at least partially extending into the slot, the protrusion provides guidance during installation. The fit between the protrusion and the slot ensures that the inner and outer poles remain relatively fixed, preventing them from rotating relative to each other during assembly, which could affect welding quality. Furthermore, the protrusion further enhances the connection strength between the inner and outer poles.

[0011] In an optional embodiment, a mounting groove is formed on the top end surface of the outer pole, and the mounting groove is communicated with the tapered through hole; and the limiting protrusion of the inner pole extends into the mounting groove.

[0012] Beneficial effect: By opening a mounting groove on the top end face of the outer pole and connecting the mounting groove with the tapered through hole, during installation, the tapered protrusion of the limiting protrusion is inserted into the tapered through hole until the outer wall surface of the tapered protrusion abuts against the inner wall surface of the tapered through hole, until the limiting protrusion extends into the mounting groove.

[0013] In an optional embodiment, the top end surface of the tapered protrusion is flush with the top end surface of the mounting groove; or the top end surface of the tapered protrusion is lower than the top end surface of the mounting groove.

[0014] Beneficial effect: By making the top end surface of the tapered protrusion lower than or flush with the top end surface of the mounting groove, it is prevented that the welding product in the mounting groove will not be higher than the top end surface of the mounting groove, thereby preventing the welding product in the mounting groove from affecting the subsequent contact between the aluminum busbar and the first pole body, which helps to further improve the durability and reliability of the circuit.

[0015] In an optional embodiment, when the pole is a negative pole, the outer pole includes a first pole body and a second pole body, the first pole body is used to be electrically connected to the electrical equipment, and the second pole body is arranged on a side of the first pole body close to the inner pole, and the second pole body is connected to the first pole body.

[0016] In an optional embodiment, the first pole body is made of aluminum or aluminum alloy, and the second pole body is made of copper.

[0017] Beneficial effects: By making the material of the first pole body aluminum or aluminum alloy and the material of the second pole body copper, aluminum or aluminum alloy is used as the outer layer structure, which is convenient for welding with the aluminum busbar; at the same time, the use of copper-aluminum composite outer pole is lighter than that of pure copper outer pole, which helps to reduce the overall weight of the battery while ensuring strength, and improve the battery's energy density and endurance.

[0018] In an optional embodiment, when the electrode is a positive electrode, the positive electrode includes a positive outer electrode, and the positive outer electrode is designed as an integral part.

[0019] In an optional embodiment, the angle between the generatrix of the tapered through hole and its central axis is less than or equal to the angle between the generatrix of the tapered protrusion and its central axis.

[0020] Beneficial effect: By making the angle between the generatrix of the tapered through hole and its central axis less than or equal to the angle between the generatrix of the tapered convex portion and its central axis, the tapered convex portion can be tightly fitted to the tapered through hole during installation, ensuring that the weld cannot affect the components inside the top cover.

[0021] In a second aspect, the present invention further provides a top cover assembly, comprising a top cover, a pole, and an adapter plate. Specifically, the top cover is provided with a pole hole; the pole is installed in the pole hole; wherein the outer pole is provided on the top cover; and the inner pole is provided on the adapter plate.

[0022] Beneficial effect: Since the top cover assembly includes the top cover, it has the same effect as the top cover and will not be described in detail here.

[0023] In a third aspect, the present invention provides a battery comprising a housing, a battery cell, and a top cover assembly. Specifically, the housing comprises a housing with an opening on one side; the battery cell is mounted in the housing; and the top cover assembly is the top cover assembly described in the second aspect, mounted at the opening of the housing.

[0024] Beneficial effects: Since the battery includes a top cover assembly, it has the same effects as the top cover assembly and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the specific implementation methods of the present invention, the following will briefly introduce the drawings required for use in the description of the specific implementation methods. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A top view of the top cover assembly provided by the utility model;

[0027] Figure 2 for Figure 1 Cross-sectional view of section AA;

[0028] Figure 3 for Figure 2 A partial enlarged view of part B;

[0029] Figure 4 A partial cross-sectional view showing another matching method between the inner and outer poles;

[0030] Figure 5 This is an exploded view of the battery provided by the present invention.

[0031] Description of reference numerals:

[0032] 1. Pole; 11. Outer pole; 111. Mounting groove; 112. First pole body; 113. Second pole body; 12. Inner pole; 121. Tapered convex portion; 122. Equal-diameter convex portion; 123. Protrusion;

[0033] 2. Top cover;

[0034] 3. Shell;

[0035] 4. Battery cell. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0037] In the description of this application, it should be understood that the terms "center", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] Conventional technology uses a terminal consisting of an outer terminal and an inner terminal. The outer terminal is located on the top cover and electrically connected to the electrical device. The outer terminal has a through-hole, while the inner terminal is mounted on the adapter plate. The inner terminal has a terminal protrusion. During installation, the terminal protrusion is inserted into the through-hole and welded to complete the electrical connection between the adapter plate and the top cover. However, due to the air gap between the outer and inner terminals after installation, the welding process may result in poor welding quality, such as cold welding, which can easily render the battery scrapped.

[0041] To this end, the present application changes the structure of the outer pole and the inner pole so that the outer pole and the inner pole fit closely together to avoid the occurrence of air gaps.

[0042] Specifically, see Figures 1 to 5 , Figure 1 shows a top view of the top cover assembly provided by the present application; Figure 2 for Figure 1Cross-sectional view of section AA; Figure 3 for Figure 2 A partial enlarged view of part B; Figure 4 A partial cross-sectional view showing another matching mode of the inner and outer poles; Figure 5 An exploded view of a battery provided in the present application is shown.

[0043] The following combination Figures 1 to 5 , describing the embodiments of the present utility model.

[0044] In the first aspect, the present invention provides a pole 1, such as Figures 1 to 3 As shown, the pole 1 includes an outer pole 11 and an inner pole 12, the outer pole 11 is provided with a limiting through-hole; the inner pole 12 is provided with a limiting protrusion, which is inserted into the limiting through-hole and then welded and fixed; wherein, in the direction in which the outer pole 11 is away from the inner pole 12, the limiting through-hole is at least partially a tapered through-hole, and the limiting protrusion is at least partially a tapered protrusion 121, and the outer wall surface of the tapered protrusion 121 abuts against the inner wall surface of the tapered through-hole.

[0045] By utilizing the technical solution of this embodiment, a tapered through-hole is provided at the limiting through-hole of the outer pole 11, and a tapered protrusion 121 is provided at the limiting protrusion of the inner pole 12. During installation, the tapered protrusion 121 is placed into the tapered through-hole until the outer wall surface of the tapered protrusion 121 abuts against the inner wall surface of the tapered through-hole, so that the tapered protrusion 121 fits tightly with the tapered through-hole, that is, an air gap is avoided between the outer pole 11 and the inner pole 12, thereby avoiding the occurrence of poor welding such as cold welding, reducing the failure rate of the circuit due to poor contact, and at the same time, through stable welding, it can resist the influence of external factors such as vibration and temperature changes, thereby improving the durability and reliability of the circuit.

[0046] In an optional embodiment, the outer pole 11 is provided with an equal-diameter through hole, and the radial dimension of the equal-diameter through hole is larger than the radial dimension of the tapered through hole on the side close to the equal-diameter through hole, so as to form a step structure; the inner pole 12 is provided with an equal-diameter protrusion 122, and the equal-diameter protrusion 122 is inserted into the equal-diameter through hole.

[0047] By utilizing the technical solution of this embodiment, an equal-diameter through hole is provided at the outer pole 11, and the radial dimension of the equal-diameter through hole is made larger than the radial dimension of the tapered through hole close to the equal-diameter through hole, thereby forming a step structure. In addition, an equal-diameter protrusion 122 is provided at the inner pole 12. During installation, the equal-diameter protrusion 122 is sequentially passed through the equal-diameter through hole and the tapered through hole at the opening of the equal-diameter through hole. The step structure can also prevent welding slag from falling onto the battery cell 4 during welding, thereby avoiding damage to the battery cell 4 and improving the welding quality.

[0048] In an optional embodiment, as Figure 4As shown, the outer wall surface of the tapered convex portion 121 is provided with a protrusion 123 extending in the direction of the central axis of the tapered convex portion 121 (the central axis direction of the tapered convex portion 121 is Figure 4 The inner wall of the tapered through hole is provided with a groove body adapted to the protrusion 123 along the central axis direction of the tapered through hole (the central axis direction of the tapered through hole is also Figure 4 In the vertical direction in FIG, the protrusion 123 can at least partially extend into the slot body.

[0049] By providing a protrusion 123 on the outer wall of the tapered protrusion 121, a slot is provided on the inner wall of the tapered through-hole to fit within the protrusion 123, with the protrusion 123 at least partially extending into the slot. During installation, the protrusion 123 provides guidance, and the fit between the protrusion 123 and the slot ensures that the inner and outer poles 12 and 11 are relatively fixed, preventing them from rotating relative to each other during assembly, which could affect welding quality. Furthermore, the provision of the protrusion 123 further enhances the connection strength between the inner and outer poles 12 and 11.

[0050] Furthermore, in the present application, the inner pole 12 and the outer pole 11 are configured to be conformable.

[0051] Specifically, the top end surface of the equal-diameter protrusion 122 of the inner pole 12 is used to abut against the bottom end surface of the tapered through hole of the outer pole 11 .

[0052] With such an arrangement, during installation, the top end face of the equal-diameter protrusion 122 abuts against the bottom end face of the tapered through hole, thereby achieving positioning. At the same time, during welding, the top end face of the equal-diameter protrusion 122 can also prevent welding slag from falling onto the battery cell 4, thereby avoiding damage to the battery cell 4 and improving welding quality.

[0053] Of course, in other optional embodiments, a gap is left in the vertical direction between the top end surface of the equal-diameter protrusion 122 of the inner pole 12 and the bottom end surface of the tapered through hole of the outer pole 11 (not shown in the figure).

[0054] Furthermore, in the present application, the radial dimension of the side of the tapered through hole away from the equal-diameter through hole is smaller than the radial dimension of the side of the tapered through hole close to the equal-diameter through hole.

[0055] It can be explained that, in the present application, a mounting groove 111 is provided on the top end surface of the outer pole 11 , and the mounting groove 111 is communicated with the tapered through hole; the limiting protrusion of the inner pole 12 extends into the mounting groove 111 .

[0056] Utilizing the technical solution of this embodiment, a mounting groove 111 is opened on the top end face of the outer pole 11, and the mounting groove 111 is connected to the tapered through-hole. During installation, the tapered protrusion 121 of the limiting protrusion is inserted into the tapered through-hole until the outer wall surface of the tapered protrusion 121 abuts against the inner wall surface of the tapered through-hole, and until the limiting protrusion extends into the mounting groove 111.

[0057] Likewise, in the above embodiment, the inner wall of the tapered through hole and the outer wall of the tapered protrusion 121 constitute a first welding region, and during welding, laser welding is performed in the first welding region.

[0058] Furthermore, there is no specific limitation on the position between the top end surface of the limiting protrusion of the inner pole 12 and the top end surface of the outer pole 11 .

[0059] In order to reduce the influence of welding products on the connection between the conductive bar and the outer pole 11 , for example, in the present application, the top end surface of the tapered protrusion 121 is flush with the top end surface of the mounting groove 111 .

[0060] Of course, in other optional embodiments, the top end surface of the tapered protrusion 121 is lower than the top end surface of the mounting groove 111 .

[0061] By utilizing the technical solution of this embodiment, by making the top end surface of the tapered protrusion 121 lower than or flush with the top end surface of the mounting groove 111, the welding product in the mounting groove 111 is prevented from being higher than the top end surface of the mounting groove 111, thereby preventing the welding product in the mounting groove 111 from affecting the subsequent contact between the aluminum bus and the first pole body 112, which helps to further improve the durability and reliability of the circuit. At the same time, by providing the mounting groove 111, it helps to place the welding product in the gap, improve the space occupancy rate, and thus help to reduce the overall weight of the battery and improve the energy density and endurance of the battery.

[0062] It can be explained that the pole 1 includes a positive pole and a negative pole.

[0063] It can be explained that when the pole 1 is used as a positive pole, the outer pole 11 is designed as an integral part.

[0064] It can be explained that when the electrode 1 is used as a negative electrode, there is no specific limitation on the structure of the electrode 1 , as long as it can connect the circuit.

[0065] For example, when the pole 1 is used as a negative pole, the outer pole 11 includes a first pole body 112 and a second pole body 113. The first pole body 112 is used to be electrically connected to the electrical equipment, and the second pole body 113 is arranged on the side of the first pole body 112 close to the negative inner pole 12. The second pole body 113 is connected to the first pole body 112.

[0066] Preferably, when the electrode 1 is used as a negative electrode, a tapered through hole is provided in the first electrode body 112 , and a through hole of equal diameter is provided in the second electrode body 113 .

[0067] It can be noted that there is no specific limitation on the materials of the first pole body 112 and the second pole body 113 .

[0068] In one embodiment, the first pole body 112 is made of aluminum or aluminum alloy, and the second pole body 113 is made of copper.

[0069] By utilizing the technical solution of this embodiment, by making the material of the first pole body 112 aluminum or aluminum alloy and the material of the second pole body 113 copper, aluminum or aluminum alloy is used as the outer layer structure, which is convenient for welding with the aluminum busbar; at the same time, the use of a copper-aluminum composite outer pole 11 is lighter than that of a pure copper outer pole 11, which helps to reduce the overall weight of the battery while ensuring strength, thereby improving the energy density and endurance of the battery.

[0070] It can be explained that in the above embodiment, the outer wall of the tapered protrusion 121 is chamfered externally, and the inner wall of the tapered through hole is chamfered internally. In order to make the outer wall of the tapered protrusion 121 abut against the inner wall of the tapered through hole, it is necessary to make the outer chamfer greater than or equal to the inner chamfer.

[0071] That is, the angle between the generatrix of the tapered through hole and its central axis is less than or equal to the angle between the generatrix of the tapered protrusion 121 and its central axis.

[0072] By utilizing the technical solution of this embodiment, by making the angle between the busbar of the tapered through hole and its central axis less than or equal to the angle between the busbar of the tapered protrusion 121 and its central axis, during the installation process, the tapered protrusion 121 can be tightly fitted with the tapered through hole, ensuring that the weld cannot affect the components inside the top cover 2.

[0073] In a second aspect, the present invention further provides a top cover assembly comprising a top cover 2, a pole 1, and an adapter plate. The top cover 2 is provided with a pole hole, and the pole 1 is the pole 1 illustrated in the first aspect, in this case installed in the pole hole; an outer pole 11 is mounted on the top cover 2; and an inner pole 12 is mounted on the adapter plate.

[0074] Specifically, the top cover 2 is provided with a positive pole hole and a negative pole hole; there are two poles 1, which serve as a positive pole and a negative pole respectively and are installed in the positive pole hole and the negative pole hole respectively, and the outer pole 11 is provided on the top cover 2, and the inner pole is provided on the adapter.

[0075] By utilizing the technical solution of this embodiment, since the top cover assembly includes the top cover 2 , it has the same effect as the top cover 2 , and will not be described in detail here.

[0076] In a third aspect, the present invention provides a battery, comprising a housing 3, a battery cell 4 and a top cover assembly.

[0077] Specifically, the shell 3 is provided with a accommodating chamber with an opening on one side; the battery cell 4 is installed in the accommodating chamber; the top cover assembly is the top cover assembly of the second aspect, and the top cover assembly is installed at the opening of the accommodating chamber.

[0078] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A pole, characterized in that: include: An outer pole (11), wherein the outer pole (11) is provided with a limiting through hole; An inner pole (12), wherein the inner pole (12) is provided with a limiting protrusion, and the limiting protrusion is inserted into the limiting through hole and then fixed by welding; Wherein, in the direction in which the outer pole (11) moves away from the inner pole (12), the limiting through hole is at least partially a tapered through hole, the limiting protrusion is at least partially a tapered protrusion (121), and the outer wall surface of the tapered protrusion (121) abuts against the inner wall surface of the tapered through hole.

2. The pole according to claim 1, characterized in that The outer pole (11) further comprises a through hole of equal diameter, wherein the radial dimension of the through hole of equal diameter is greater than the radial dimension of the tapered through hole on a side close to the through hole of equal diameter, so as to form a step structure; The inner pole (12) further includes an equal-diameter protrusion (122), and the equal-diameter protrusion (122) is inserted into the equal-diameter through hole.

3. The pole according to claim 1, characterized in that The outer wall surface of the tapered convex portion (121) is provided with a protrusion (123) extending along the central axis direction of the tapered convex portion (121). The inner wall surface of the tapered through hole is provided with a groove body adapted to the protrusion (123), and at least a portion of the protrusion (123) can extend into the groove body.

4. The pole according to claim 1, characterized in that A mounting groove (111) is provided on the top end surface of the outer pole (11), and the mounting groove (111) is communicated with the tapered through hole; The limiting protrusion of the inner pole (12) extends into the installation groove (111).

5. The pole according to claim 4, characterized in that: The top end surface of the tapered protrusion (121) is flush with the top end surface of the mounting groove (111); or The top end surface of the tapered protrusion (121) is lower than the top end surface of the mounting groove (111).

6. The pole according to any one of claims 1 to 5, characterized in that: When the pole (1) is a negative pole, the outer pole (11) comprises a first pole body (112) and a second pole body (113), wherein the first pole body (112) is used for being electrically connected to an electrical device, and the second pole body (113) is arranged on a side of the first pole body (112) close to the inner pole (12), and the second pole body (113) is connected to the first pole body (112).

7. The pole according to any one of claims 1 to 5, characterized in that: When the pole (1) is a positive pole, the outer pole (11) is designed as an integral part.

8. The pole according to any one of claims 1 to 5, characterized in that: The angle between the generatrix of the tapered through hole and its central axis is less than or equal to the angle between the generatrix of the tapered protrusion (121) and its central axis.

9. A top cover assembly, characterized in that: include: A top cover (2), wherein the top cover (2) is provided with a pole hole; A pole (1), which is the pole (1) according to any one of claims 1 to 8, and is installed in the pole hole; adapter; The outer pole (11) is arranged on the top cover (2); and the inner pole (12) is arranged on the adapter plate.

10. A battery, characterized in that: include: A housing (3), wherein the housing (3) is provided with a receiving chamber with an opening on one side; A battery core (4), the battery core (4) being installed in the accommodating chamber; The top cover assembly is the top cover assembly described in claim 8 or 9, and the top cover assembly is installed at the opening of the accommodating chamber.

Images