Battery cell

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery monomer. According to the single battery, an inlet and an outlet of a battery shell are respectively sealed through a first top cover assembly and a second top cover assembly, and a first pole of the first top cover assembly and a second pole of the second top cover assembly are respectively connected with an adapter, particularly connected to a pole connecting part of the adapter; the tab connecting parts of the two adapters are respectively connected with the first tab and the second tab of the battery cell, and the tab connecting parts, the first tab and the second tab extend along the first direction, so that the first tab and the second tab do not need to be bent when being connected with the tab connecting parts, and the first tab and the second tab do not need to be manufactured to be too long; the raw material cost is reduced, the assembly steps can be simplified, and the production efficiency of the battery is improved; meanwhile, the space occupied by the tabs is reduced, so that the energy density of the battery can be improved; and on the other hand, the tabs cannot interpolate the battery cell, so that the use safety and reliability of the battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer. Background Art

[0002] At present, when assembling blade batteries, the tab on one side is usually welded to the cover plate on one side first, and the other end relies on the bracket to fix the battery cell, and is coated with Mylar film and then put into the shell. The tab on the other side is then welded to the cover plate on the other side, and finally the two cover plates are welded and fixed to the shell. After entering the shell, due to the obstruction of the shell, the length of the tab on the other side needs to be made longer in order to be welded to the cover plate, and then the cover plate can be bent and welded to the shell. On the one hand, this assembly method increases the cost of the fluid foil required to make the tabs, and on the other hand, the longer tabs also occupy more accommodation space, reducing the energy density of the battery. At the same time, the long tabs are not convenient for shaping, which can easily cause the tabs to be inserted and cause the battery to short-circuit, posing certain safety hazards. Moreover, this assembly method requires more parts, such as the need to add an additional mounting bracket, and the assembly process is more complicated.

[0003] In order to accommodate the long pole ear into the battery, the long pole ear needs to be bent. There are two types of bending methods, U-shaped and S-shaped. The above bending methods all require a longer pole ear length, and the pole ear is prone to intercalation after bending. It is necessary to continuously adjust the pole ear length and the position of the folded position. In mass production, due to errors such as assembly positioning of equipment tooling, the shape of the pole ear cannot be kept consistent, and the consistency of the produced batteries is poor.

[0004] Therefore, there is an urgent need to provide a new type of battery cell to solve the above technical problems in the prior art. Utility Model Content

[0005] The utility model aims to provide a battery cell, which can shorten the length of the pole ear, simplify the assembly process of the battery, thereby reducing the manufacturing cost, and can improve the safety performance and energy density of the battery.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery cell comprises a battery shell, a battery cell, a first top cover assembly, a second top cover assembly and two adapters, wherein the battery shell has an inlet and an outlet arranged opposite to each other along a first direction, and the size of the outlet is smaller than the size of the inlet; the battery cell comprises a main body, a first pole lug and a second pole lug; the first pole lug and the second pole lug are respectively arranged at two ends of the main body along the first direction; the two adapters each comprise a pole connecting portion and a pole lug connecting portion connected in sequence, and the pole lug connecting portion extends along the first direction; the pole lug connecting portions of the two adapters are respectively connected to the first pole lug and the second pole lug; the first top cover assembly comprises a first cover plate and a first pole arranged on the first cover plate, and the first cover plate seals the inlet of the battery shell; the second top cover assembly comprises a second cover plate and a second pole arranged on the second cover plate, and the second cover plate seals the outlet of the battery shell; the pole column connecting portions of the two adapters are respectively connected to the first pole and the second pole.

[0008] Optionally, the battery housing comprises an outer shell and an end cover, wherein one end of the outer shell along the first direction is provided with the inlet, and the other end is provided with an opening; the end cover seals the opening and is provided with the outlet.

[0009] Optionally, the first top cover assembly further includes a first insulating member, and the plate surface of the first cover plate facing the battery cell is fitted with the first insulating member; the second top cover assembly further includes a second insulating member, and the plate surface of the second cover plate facing the battery cell is fitted with the second insulating member; the first insulating member and the second insulating member are both insulating plates.

[0010] Optionally, the insulating plate has a first surface facing the battery cell; the first surface of the insulating plate is provided with two protrusions abutting against the main body of the battery cell, and the two protrusions are respectively arranged at two ends of the insulating plate along the second direction, wherein the second direction and the first direction are perpendicular to each other.

[0011] Optionally, the first surface of the insulating plate is provided with a plurality of limiting ribs, the plurality of limiting ribs and the first surface of the insulating plate form an adapter limiting groove engaged with the pole connecting portion, and a pole avoidance hole is provided at the bottom of the adapter limiting groove.

[0012] Optionally, the first surface of the insulating plate is further provided with a plurality of reinforcing ribs.

[0013] Optionally, two of the battery cells are provided, and the two adapters each include two pole lug connecting portions, and the two pole lug connecting portions are connected via the pole connecting portion.

[0014] Optionally, a welding avoidance groove is provided on a side of the above-mentioned raised portion facing the above-mentioned battery core, and the above-mentioned welding avoidance groove extends along the second direction and passes through both ends of the above-mentioned raised portion along the second direction; in the third direction, the width of the above-mentioned welding avoidance groove is greater than or equal to the distance between the two pole ear connecting parts in the above-mentioned adapter, wherein the above-mentioned third direction and the above-mentioned second direction are perpendicular to each other.

[0015] Optionally, the above-mentioned insulating plate includes a first insulating part and a second insulating part arranged in sequence along the second direction, the above-mentioned first insulating part and the above-mentioned second insulating part are detachably connected, and the two above-mentioned protrusions are respectively arranged on the above-mentioned first insulating part and the above-mentioned second insulating part; the above-mentioned adapter limiting groove is arranged on the above-mentioned first insulating part.

[0016] Optionally, an end surface of the second insulating part close to the first insulating part is recessed to form a slot, and a slot wall of the slot is provided with a plurality of slots penetrating the second insulating part; an end surface of the first insulating part close to the second insulating part is provided with a plurality of hooks, and the plurality of hooks are all inserted into the slot, and the hook portion of the hook is engaged with the corresponding slot.

[0017] Beneficial effects:

[0018] The battery cell in the utility model seals the inlet and outlet of the battery shell respectively through the first top cover assembly and the second top cover assembly, wherein the first pole post of the first top cover assembly and the second pole post of the second top cover assembly are respectively connected with adapters, specifically the pole post connecting parts connected to the adapters, and the pole ear connecting parts of the two adapters are respectively connected with the first pole ear and the second pole ear of the battery cell, and the pole ear connecting part, the first pole ear and the second pole ear all extend along the first direction, so that the first pole ear and the second pole ear do not need to be bent when the first pole ear and the second pole ear are connected to the pole ear connecting part, and the first pole ear and the second pole ear do not need to be made too long, which reduces the cost of raw materials and is more convenient for assembly, can simplify the assembly steps, improve assembly efficiency, and improve the production efficiency of the battery; at the same time, the space occupied by the pole ears is reduced, which can improve the energy density of the battery; on the other hand, the pole ears will not be inserted into the battery cell, which improves the safety and reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an axonometric view of a cover plate assembly provided in a specific embodiment of the utility model;

[0020] Figure 2 It is an axonometric view of the cover plate assembly provided in the first embodiment of the present utility model from another perspective;

[0021] Figure 3 This is an axonometric view of the cover plate assembly provided in the second embodiment of the present utility model from another perspective;

[0022] Figure 4 This is an axonometric view of the cover plate assembly provided in the third embodiment of the present utility model from another perspective;

[0023] Figure 5 It is a cross-sectional view of a partial structure of a battery provided by a specific embodiment of the utility model;

[0024] Figure 6 This is the first embodiment of the utility model Figure 5 A partial enlarged view of the middle A;

[0025] Figure 7 This is the third embodiment of the utility model Figure 5 A partial enlarged view of point A in the middle.

[0026] In the figure:

[0027] 1. Battery housing; 10. Battery cell; 11. Second pole ear; 12. First pole ear;

[0028] 40. a first cover plate; 41. a first pole;

[0029] 100, end cover; 101, annular flange; 110, second cover plate; 111, annular protrusion;

[0030] 200, second pole;

[0031] 300, adapter; 310, pole ear connection portion; 320, pole connection portion;

[0032] 400, insulating plate; 401, first insulating portion; 402, second insulating portion; 410, raised portion; 411, welding avoidance groove; 412, bayonet; 413, hook; 420, limiting convex rib. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] Please refer to Figures 1 to 7 , the first direction described in this specific implementation manner is Figure 5 The X direction is shown in FIG, which is the length direction of the battery cell 10; the second direction is Figure 2 and Figure 3 The Y direction shown in FIG. 1 is the width direction of the battery cell 10; the third direction is Figure 2 and Figure 5 The Z direction is the thickness direction of the battery cell 10; the first direction, the second direction and the third direction are perpendicular to each other.

[0038] Embodiment 1

[0039] The battery cell comprises a battery case 1, a battery cell 10, a first top cover assembly, a second top cover assembly and two adapters 300. The battery case 1 has an inlet and an outlet arranged opposite to each other along a first direction, and the size of the outlet is smaller than the size of the inlet. The battery cell 10 comprises a main body, a first pole ear 12 and a second pole ear 11. The first pole ear 12 and the second pole ear 11 are respectively arranged at two ends of the main body along the first direction. The two adapters 300 each comprise a pole column connecting portion 320 and a pole ear connecting portion 310 connected in sequence, and the pole ear connecting portion 310 extends along the first direction. ; The above-mentioned pole ear connecting parts 310 of the two above-mentioned adapters 300 are respectively connected to the above-mentioned first pole ear 12 and the above-mentioned second pole ear 11; the above-mentioned first top cover assembly includes a first cover plate 40 and a first pole 41 arranged on the first cover plate 40, and the above-mentioned first cover plate 40 seals the inlet of the above-mentioned battery casing 1; the above-mentioned second top cover assembly includes a second cover plate 110 and a second pole 200 arranged on the second cover plate 110, and the above-mentioned second cover plate 110 seals the outlet of the above-mentioned battery casing 1; the pole column connecting parts 320 of the two above-mentioned adapters 300 are respectively connected to the first pole 41 and the second pole 200.

[0040] In this specific embodiment, since the size of the outlet is smaller than the size of the above-mentioned inlet, that is, the first pole ear 12 and the second pole ear 11 of the battery cell 10 can be connected to the first top cover assembly and the second top cover assembly and then enter the battery housing 1 through the inlet. Therefore, compared with the existing battery monomer, it is not necessary to be restricted by the battery housing 1, and the design is more convenient. For this purpose, the pole ear connecting parts 310 of the two adapters 300 are designed to extend along the first direction, and the pole ear connecting parts 310 of the two adapters 300 are respectively connected to the first pole ear 12 and the second pole ear 11 of the battery cell 10. After the poles on the cover assembly are connected, the first pole ear 12 and the second pole ear 11 are both arranged along the first direction, and the pole ears do not need to be bent. Therefore, the space occupied by the pole ears can be minimized while ensuring that the pole ears and the pole ear connecting portion 310 of the adapter 300 can be welded, thereby reducing the cost of raw materials and making assembly easier, simplifying the assembly steps, improving assembly efficiency, and improving the production efficiency of the battery; at the same time, the space occupied by the pole ears is reduced, which can improve the energy density of the battery; on the other hand, the pole ears will not be inserted into the battery cell 10, thereby improving the safety and reliability of the battery.

[0041] In this specific embodiment, the battery housing 1 includes a housing and an end cover 100. One end of the housing in the first direction is provided with the inlet, and the other end is provided with an opening. The end cover 100 seals the opening and is provided with the outlet. Thus, after the ordinary square aluminum housing is installed with the end cover 100 and the end cover 100 is provided with an outlet, a structure with an inlet with a larger opening at one end and an outlet with a smaller opening at the other end can be formed, that is, the battery housing 1 structure required in this embodiment is formed, and the manufacturing process is simple and convenient.

[0042] It should be noted that the battery housing 1 can be an integrated structure, that is, the end cover 100 and the outer shell are integrally formed, and the battery housing 1 can also be a split structure, that is, the end cover 100 and the outer shell are welded.

[0043] Among them, Figures 5 to 7 As shown, the adapter 300 near the outlet in this embodiment is connected to the second pole 200, the second top cover assembly includes a second cover plate 110, the second pole 200 is penetrated by the second cover plate 1100, the circumferential wall of the second cover plate 110 is convexly provided with an annular protrusion 111, the circumferential wall of the outlet of the end cover 100 is provided with an annular flange 101, the annular protrusion 111 is pressed and abutted against the above-mentioned annular flange 101, so as to achieve the fixation of the second cover plate 110 and the end cover 100, that is, to achieve the fixation of the second top cover assembly and the end cover 100; the installation method of the first top cover assembly and the inlet can also adopt the same installation method as the above-mentioned second top cover assembly, and can also adopt a common top cover structure, the adapter 300 near the inlet is connected to the first pole 41, the first cover plate 40 is penetrated by the above-mentioned first pole 41, and then the first cover plate 40 is directly welded to the inlet.

[0044] Please continue to refer to Figures 1 to 4 The first top cover assembly further includes a first insulating member, and the plate surface of the first cover plate 40 facing the battery cell 10 is fitted with the first insulating member; the second top cover assembly further includes a second insulating member, and the plate surface of the second cover plate 110 facing the battery cell 10 is fitted with the second insulating member; the first insulating member and the second insulating member are both insulating plates 400. The provision of the insulating plates 400 enables the battery cell 10 to form an insulating connection with the first top cover assembly and the second top cover assembly, thereby preventing the battery cell 10 from short-circuiting, and further improving the safety and reliability of use.

[0045] Furthermore, the insulating plate 400 has a first surface facing the battery cell 10; the first surface of the insulating plate 400 is provided with two protrusions 410 that abut against the main body of the battery cell 10, and the two protrusions 410 are respectively provided at both ends of the second direction of the insulating plate 400, wherein the second direction and the first direction are perpendicular to each other. The provision of the two protrusions 410 can guide the insulating plate 400 when inserted into the battery housing 1, and can also limit the battery cell 10 in the battery housing 1, so as to avoid the battery cell 10 from moving when vibration occurs, thereby improving the safety of the battery.

[0046] As a preferred embodiment, the first surface of the insulating plate 400 is provided with a plurality of limiting ribs 420, and the plurality of limiting ribs 420 and the first surface of the insulating plate 400 are surrounded by an adapter limiting groove that engages with the pole connecting portion 320, and a pole avoidance hole is provided at the bottom of the adapter limiting groove. The setting of the limiting ribs can facilitate the positioning and installation of the adapter 300, and play a role in limiting the rotation and displacement of the adapter 300. At the same time, the pole avoidance hole is used to install the first pole 41, which will not be described here. The first surface described here is the end surface of the insulating plate 400 close to the battery cell 10 along the first direction.

[0047] Specifically, a plurality of reinforcing ribs are further provided on the first surface of the insulating plate 400. The reinforcing ribs can improve the mechanical strength of the insulating plate 400, and improve the overall strength and service life of the insulating plate 400 and the battery.

[0048] like Figure 1 , Figure 4 and Figure 7 As shown, in this embodiment, only one battery cell 10 is accommodated in the battery housing 1, and the battery cell 10 is a structure with tabs on both sides, that is, the first tab 12 and the first tab 11 are arranged on both sides along the first direction, and the adapter 300 is an L-shaped structure, that is, there is one tab connection part 310, and the tab connection part 310 is arranged perpendicular to the end of the pole connection part 320. In this embodiment, only one tab connection part 310 is used for the welding of the tab, and the other side provides a welding base, and the insulating plate 400 does not need to be provided with a welding avoidance groove 411.

[0049] Embodiment 2

[0050] Please refer to Figure 1 , Figure 2 and Figure 6In this embodiment, the only difference from the first embodiment is that two battery cells 10 are provided, and the two adapters 300 each include two tab connection parts 310, which are connected by the pole connection part 320. Specifically, the two tab connection parts 310 are provided at both ends of the pole connection part 320 along the third direction, so that the two tab connection parts 310 and the pole connection part form a U-shaped structure.

[0051] It is conceivable that when two or more battery cells 10 are stacked, they need two or more pole lug connections 310 spaced apart along a third direction for connection, and two or more pole lug connections 310 are simultaneously connected to the same pole connection 320 to achieve bus connection of multiple battery cells 10.

[0052] Optionally, a welding avoidance groove 411 is provided on one side of the protrusion 410 facing the battery cell 10, and the welding avoidance groove 411 extends along the second direction and passes through both ends of the protrusion 410 in the second direction; in the third direction, the width of the welding avoidance groove 411 is greater than or equal to the distance between the two tab connection parts 310 in the adapter 300, wherein the third direction and the second direction are perpendicular to each other. The welding avoidance groove 411 is used to place the lower tooth seat of ultrasonic welding or the jig of laser welding, so as to facilitate welding operation, thereby further improving welding and assembly efficiency and improving battery production efficiency.

[0053] Embodiment 3

[0054] Please refer to Figure 3 , the difference between the third embodiment and the second embodiment is that, optionally, the insulating plate 400 includes a first insulating portion 401 and a second insulating portion 402 sequentially arranged along the second direction, the first insulating portion 401 and the second insulating portion 402 are detachably connected, the two protrusions 410 are respectively arranged on the first insulating portion 401 and the second insulating portion 402; the adapter limiting groove is arranged on the first insulating portion 401. The first insulating portion 401 and the second insulating portion 402 are detachably connected, and the adapter limiting groove is arranged on the first insulating portion 401. After the electrode tab welding is completed, the second insulating portion 402 can be assembled with the first insulating portion 401, so that the insulating plate 400 can better abut against the battery cell 10 and the battery housing, thereby improving the structural stability and reliability of the battery.

[0055] Optionally, the end surface of one end of the second insulating part 402 close to the first insulating part 401 is recessed to form a slot, and the slot wall of the slot is provided with a plurality of snap-in ports 412 penetrating the second insulating part 402; the end surface of one end of the first insulating part 401 close to the second insulating part 402 is provided with a plurality of hooks 413, and the plurality of hooks 413 are all inserted into the slot, and the hook portion of the hook 413 is locked with the corresponding snap-in port 412. In this embodiment, two hooks 413 and two snap-in ports 412 are provided respectively, and the snap-in ports 412 are used to clamp the hooks 413, which can improve the connection stability between the first insulating part 401 and the second insulating part 402 and prevent the second insulating part 402 from falling off.

[0056] This specific embodiment also provides an electric device, which includes the battery cell described in the above solution. The electric device can be an electric car, an electric bicycle, an energy storage device, a ship or other equipment, and only needs to be powered by a battery, and no specific restrictions are made here. The electric device includes all the beneficial effects of the battery cell described in the above solution, which will not be repeated here one by one.

[0057] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery cell, characterized in that: include: A battery housing (1), the battery housing (1) having an inlet and an outlet arranged opposite to each other along a first direction, the size of the outlet being smaller than the size of the inlet; A battery cell (10), the battery cell (10) comprising a main body, a first pole lug (12) and a second pole lug (11); the first pole lug (12) and the second pole lug (11) are respectively arranged at two ends of the main body along the first direction; Two adapters (300), each of the two adapters (300) comprising a pole connecting portion (320) and a pole lug connecting portion (310) connected in sequence, the pole lug connecting portion (310) extending along the first direction; the pole lug connecting portions (310) of the two adapters (300) are respectively connected to the first pole lug (12) and the second pole lug (11); A first top cover assembly, the first top cover assembly comprising a first cover plate (40) and a first pole (41) arranged on the first cover plate (40), the first cover plate (40) sealing an inlet of the battery housing (1); A second top cover assembly, the second top cover assembly comprising a second cover plate (110) and a second pole (200) arranged on the second cover plate (110), the second cover plate (110) sealing the outlet of the battery housing (1); the pole connecting parts (320) of the two adapters (300) are respectively connected to the first pole (41) and the second pole (200).

2. The battery cell according to claim 1, characterized in that: The battery housing (1) comprises an outer shell and an end cover (100); one end of the outer shell along a first direction is provided with the inlet, and the other end is provided with an opening; the end cover (100) seals the opening and is provided with the outlet.

3. The battery cell according to claim 2, characterized in that: The first top cover assembly also includes a first insulating member, and the plate surface of the first cover plate facing the battery cell (10) is fitted with the first insulating member; the second top cover assembly also includes a second insulating member, and the plate surface of the second cover plate facing the battery cell (10) is fitted with the second insulating member; the first insulating member and the second insulating member are both insulating plates (400).

4. The battery cell according to claim 3, characterized in that: The insulating plate (400) has a first surface arranged facing the battery cell (10); the first surface of the insulating plate (400) is provided with two protrusions (410) abutting against the main body of the battery cell (10), and the two protrusions (410) are respectively arranged at two ends of the insulating plate (400) along a second direction, wherein the second direction and the first direction are perpendicular to each other.

5. The battery cell according to claim 4, characterized in that: The first surface of the insulating plate (400) is provided with a plurality of limiting convex ribs (420), the plurality of limiting convex ribs (420) and the first surface of the insulating plate (400) enclose an adapter limiting groove engaged with the pole connecting portion (320), and a pole avoidance hole is provided at the bottom of the adapter limiting groove.

6. The battery cell according to claim 5, characterized in that: The first surface of the insulating plate (400) is also provided with a plurality of reinforcing ribs.

7. The battery cell according to any one of claims 4 to 6, characterized in that: Two of the battery cells (10) are provided, and the two adapters (300) each include two pole lug connection portions (310), and the two pole lug connection portions (310) are connected via the pole column connection portion (320).

8. The battery cell according to claim 7, characterized in that: A welding avoidance groove (411) is provided on a side of the protruding portion (410) facing the battery core (10), and the welding avoidance groove (411) extends along a second direction and passes through two ends of the protruding portion (410) along the second direction; in a third direction, the width of the welding avoidance groove (411) is greater than or equal to the distance between two pole ear connecting portions (310) in the adapter (300), wherein the third direction and the second direction are perpendicular to each other.

9. The battery cell according to claim 7, characterized in that: The insulating plate (400) comprises a first insulating portion (401) and a second insulating portion (402) which are sequentially arranged along a second direction; the first insulating portion (401) and the second insulating portion (402) are detachably connected; the two protrusions (410) are respectively arranged on the first insulating portion (401) and the second insulating portion (402); and the adapter limiting groove is arranged on the first insulating portion (401).

10. The battery cell according to claim 9, characterized in that: The end surface of one end of the second insulating part (402) close to the first insulating part (401) is recessed to form a card slot, and the slot wall of the card slot is provided with a plurality of card slots (412) penetrating the second insulating part (402); the end surface of one end of the first insulating part (401) close to the second insulating part (402) is provided with a plurality of hooks (413), and the plurality of hooks (413) are all inserted into the card slot, and the hook part of the hook (413) is locked with the corresponding card slot (412).

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