Adapter piece and top cover

Abstract

The utility model belongs to the technical field of batteries, and discloses an adapter piece and a top cover. The switching piece comprises a conductive piece and an insulating piece, the conductive piece comprises a first welding part, a fusing part and a second welding part which are connected in sequence, and the first welding part and the second welding part are used for being connected with the pole and the tab respectively; the insulating part wraps the periphery of the fusing part, and the first welding part and the second welding part are both attached to the side, facing the battery cell, of the lower plastic. According to the adapter piece and the top cover, the insulating part is coated on the periphery of the fusing part, so that the two sides of the fusing part are covered by the insulating part, and the two sides of the fusing position are covered by part of the insulating part on the corresponding side after the fusing part is fused, so that the fusing position is covered more comprehensively, the generation of electric arc after fusing is avoided, and the safety performance of the battery is improved; on the premise of ensuring coating of the insulating part, the first welding part and the side, facing the battery cell, of the lower plastic are ensured to be attached, and the welding stability of the first welding part and the pole is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an adapter sheet and a top cover. Background Art

[0002] The adapter takes over the function of connecting the pole on the top cover with the pole ear on the battery cell, and realizes the conduction of current between the battery cell and the pole on the top cover. A fuse is provided on the adapter. When the current is too large, the fuse can be melted by the high heat generated by the current to prevent excessive heat inside the battery, causing safety problems such as battery failure or explosion. Since the gap at the fuse position may be relatively small after the fuse is blown, arcs may be generated at the two ends of the fuse position, which is dangerous. In order to prevent the generation of arcs, the insulating part is attached to the side of the fuse away from the top cover in the prior art. At the same time as the fuse is blown, the insulating part melts and wraps the two ends of the fuse position. However, since the insulating part is only provided on one side, the wrapping effect is poor, and there is still the possibility of arc generation. If both sides are wrapped, it will affect the flatness of the contact between the adapter and the pole. The pole is generally installed on the lower plastic part, and the bottom end of the pole is flush with the bottom side plane of the lower plastic part.

[0003] Therefore, it is urgent to design an adapter sheet and a top cover to solve the above problems. Utility Model Content

[0004] One purpose of the utility model is to provide an adapter sheet, which can ensure the contact flatness between the pole and the first welding part, and at the same time, insulating parts are arranged on both sides of the fuse part to ensure that the insulating parts fully wrap the two ends of the fuse position.

[0005] Another object of the utility model is to provide a top cover, the connection between the pole and the first welding part is reliable and the safety after fusing is higher.

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

[0007] Adapter, including:

[0008] The conductive member comprises a first welding portion, a fuse portion and a second welding portion which are connected in sequence, wherein the first welding portion and the second welding portion are used to be connected to the pole and the pole ear respectively;

[0009] The insulating member is coated on the outer periphery of the fuse portion, and the first welding portion and the second welding portion are both attached to the side of the lower plastic facing the battery core.

[0010] As an optional solution, the fuse portion is arched toward a side away from the lower plastic to form an accommodating gap, and a side of the insulating member facing the lower plastic is located in the accommodating gap.

[0011] As an optional solution, the above-mentioned conductive member is constructed as a flat plate, wherein:

[0012] The flat plate forms a first receiving groove on a side of the fuse portion facing the lower plastic, and the insulating member is received in the first receiving groove on a side facing the lower plastic;

[0013] The flat plate forms a second receiving groove at a side of the fuse portion away from the lower plastic, and the insulating member is received in the second receiving groove at a side away from the lower plastic and is flush with the first welding portion.

[0014] As an optional solution, both ends of the insulating member are respectively in contact with the end surfaces of the first welding portion and the second welding portion facing each other.

[0015] As an optional solution, the connection direction of the first welding part and the second welding part is the first direction, the first welding part and the second welding part are connected through the fuse part, the fuse part has a through hole, and the through hole forms a fuse zone on two opposite sides in the second direction, and the total cross-sectional area of ​​the fuse zone is 2 mm 2 -10 mm 2 , the first direction and the second direction are arranged at an angle.

[0016] As an optional solution, the insulating member is an injection molded member, and the fuse portion is provided with a flow hole running through the fuse portion in a thickness direction, and the flow hole is used for allowing injection molding liquid to flow.

[0017] As an optional solution, a rough structure is provided on a side of the first welding portion facing away from the lower plastic.

[0018] The top cover includes a pole and an upper plastic, a top cover sheet, and a lower plastic connected in sequence from top to bottom. The pole passes through the upper plastic, the top cover sheet, and the lower plastic in sequence, and also includes the adapter sheet. The first welding portion of the adapter sheet is connected to the pole.

[0019] As an optional solution, the top cover sheet is provided with a liquid injection hole, the lower plastic includes a main body and a blocking portion, the main body is arranged to avoid the liquid injection hole, the blocking portion is connected to the main body and at least a portion of the blocking portion is opposite to the liquid injection hole and is arranged at a distance, and the first welding portion is arranged in contact with the main body.

[0020] As an optional solution, the second welding portion is provided with a avoidance structure, and the avoidance structure is used to avoid the liquid injection hole and / or the blocking portion.

[0021] The beneficial effects of the utility model are:

[0022] The utility model provides an adapter, which wraps an insulating part around the periphery of a fuse part so that both sides of the fuse part are covered by the insulating part, ensuring that after the fuse part is blown, both sides of the fuse position are covered by part of the insulating part on the corresponding side, so that the fuse position is covered more comprehensively, avoiding the generation of an arc after the blown fuse, improving the safety performance of the battery, and ensuring that the first welding part and the side of the lower plastic facing the battery core are fitted under the premise of ensuring the covering of the insulating part, thereby ensuring the welding stability of the first welding part and the pole.

[0023] The utility model also provides a top cover, which includes a pole and an upper plastic, a top cover sheet, and a lower plastic connected in sequence from top to bottom, the pole is sequentially penetrated by the upper plastic, the top cover sheet, and the lower plastic, and the top cover also includes the above-mentioned adapter sheet, and the first welding portion of the adapter sheet is connected to the pole. By adopting the above-mentioned adapter sheet, the connection between the pole and the first welding portion of the top cover is reliable and the safety after fusing is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the adapter plate with the insulating member hidden provided by the first embodiment of the utility model;

[0025] Figure 2 It is a schematic diagram of the structure of the adapter provided in the first embodiment of the utility model;

[0026] Figure 3 is a cross-sectional view of the adapter provided in the first embodiment of the utility model;

[0027] Figure 4 It is a schematic diagram of the structure of the top cover provided in the first embodiment of the utility model;

[0028] Figure 5 It is a cross-sectional view of the adapter provided in the second embodiment of the utility model.

[0029] In the figure:

[0030] 10. first welding portion; 11. second plane; 12. groove;

[0031] 20. Second welding part; 21. Avoidance groove;

[0032] 30. Fusing portion; 31. First plane; 32. Fusing area; 33. Through hole; 34. Flow hole;

[0033] 40. Accommodation gap; 50. Insulation member;

[0034] 200, lower plastic; 210, main body; 220, blocking part; 300, top cover sheet; 310, liquid injection hole. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships 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.

[0039] Embodiment 1

[0040] This embodiment provides a transfer sheet, which can ensure the contact flatness between the pole and the first welding portion 10, and at the same time, an insulating member 50 is provided on both sides of the fuse portion 30 to ensure that the insulating member 50 fully wraps the two ends of the fuse position. Figure 1-Figure 3As shown, the adapter includes a conductive part and an insulating part 50, the conductive part includes a first welding part 10, a fuse part 30 and a second welding part 20 connected in sequence, the first welding part 10 and the second welding part 20 are respectively used to connect with the pole and the pole ear; the insulating part 50 is coated on the outer periphery of the fuse part 30, and the first welding part 10 and the second welding part 20 are both in contact with the side of the lower plastic 200 facing the battery cell.

[0041] The above-mentioned adapter, by wrapping the insulating part 50 around the outer periphery of the fuse part 30, makes both sides of the fuse part 30 covered by the insulating part 50, ensures that after the fuse part 30 is blown, both sides of the blown position are covered by part of the insulating part 50 on the corresponding side, so that the blown position is covered more comprehensively, avoiding the generation of arc after blowing, improving the safety performance of the battery, and ensuring that the first welding part 10 and the lower plastic 200 are in contact with the side of the battery cell while ensuring the covering of the insulating part 50, thereby ensuring the welding stability of the first welding part 10 and the pole.

[0042] It is understandable that if Figure 1-Figure 3 As shown, the plane where the fuse part 30 faces the lower plastic 200 is the first plane 31, and the plane where the first welding part 10 is attached to the lower plastic 200 is the second plane 11. The first plane 31 is located on the side of the second plane 11 away from the lower plastic 200 so that there is an accommodating gap 40 between the first plane 31 and the plane of the lower plastic 200 at the corresponding position of the first welding part 10; the insulating member 50 covers both sides of the fuse part 30, and the accommodating gap 40 is used to accommodate part of the insulating member 50 located on the side of the fuse part 30 close to the lower plastic 200. The first plane 31 is arranged on the side of the second plane 11 away from the lower plastic 200, so that when the first welding part 10 is attached to the lower plastic 200 and welded to the pole, a certain accommodating gap 40 is formed between the fuse part 30 and the lower plastic 200, and the gap ensures that the insulating member 50 can be arranged on both sides of the fuse part 30, and the formation of the accommodating gap 40 ensures the fit between the second plane 11 and the lower plastic 200, and further ensures the fit between the pole and the second plane 11, and further ensures the fit between the pole and the first welding part 10, and ensures the welding firmness of the two; at the same time, the accommodating gap 40 provides space for the arrangement of the insulating member 50.

[0043] Alternatively, if Figure 3 As shown, the fuse part 30 is arched toward the side away from the lower plastic 200 to form an accommodation gap 40, and the side of the insulating member 50 facing the lower plastic 200 is located in the accommodation gap 40. In this way, the thickness of the fuse part 30, the first welding part 10 and the second welding part 20 are the same, and the fuse part 30 is formed in a bent form, which is easier to manufacture.

[0044] Alternatively, if Figure 3As shown, there is a height difference between the second welding part 20 and the fuse part 30, and the two ends of the insulating member 50 are respectively in contact with the first welding part 10 and the second welding part 20. Through the above arrangement, during the normal use of the battery, the second welding part 20 and the first welding part 10 limit the insulating member 50 to prevent the insulating member 50 from moving and not covering the fuse position if it melts; at the same time, the insulating member 50 also limits the first welding part 10 and the second welding part 20 in the opposite direction to prevent the first welding part 10 and the second welding part 20 from moving.

[0045] Alternatively, if Figure 1 As shown, the connection direction of the first welding part 10 and the second welding part 20 is the first direction (the X direction in the figure), the first welding part 10 and the second welding part 20 are connected through the fuse part 30, the fuse part 30 is provided with a through hole 33, and the through hole 33 forms a fuse zone 32 on two opposite sides of the second direction (the Y direction in the figure, the Y direction and the X direction are arranged at an angle, and in this embodiment, the two are perpendicular), and the total cross-sectional area of ​​the fuse zone 32 is 2mm 2 -10 mm 2 . Through this arrangement, when the current of the battery cell is 600A-2000A, it can be fused in a relatively short time to cut off the current and avoid thermal runaway of the battery cell. In addition, this arrangement ensures that the size of the fuse part 30 in the second direction is relatively large, and the structural strength of the fuse part 30 can be ensured while reducing the cross-sectional area of ​​the fuse area 32, so that the fuse part 30 is not easy to break during normal use.

[0046] In other embodiments, the welded part may also have a cross-sectional area of ​​2 mm. 2 -10 mm 2 The long strip piece inside is not limited here.

[0047] Alternatively, if Figure 1 and Figure 2 As shown, the insulating member 50 is an injection molded part, and the fuse part 30 is provided with a flow hole 34 for the injection liquid to flow. The setting of the flow hole 34 can ensure the flow of the colloid in the mold during injection molding, improve the injection molding quality, and further ensure the wrapping quality of the fuse area 32.

[0048] In addition, the provision of the through hole 33 and the flow hole 34 can generate a portion of the insulating member 50 in the hole. It can be understood that the portion of the insulating member 50 in the hole is columnar, which can also play a role in limiting the insulating member 50.

[0049] Alternatively, if Figure 1 As shown, a rough structure is provided on the side of the first welding portion 10 away from the lower plastic 200. The provision of the rough structure can improve the laser absorption rate and ensure the welding quality.

[0050] Optionally, the rough structure can be Figure 1 The groove 12 shown in the figure can be specifically set in the shape of diamond, square, circle, etc.

[0051] Optionally, the rough structure may be embossing, and the embossing may be specifically provided in a shape of diamond, square, circle or the like.

[0052] Optionally, the rough structure may also be a frosted surface formed by frosting the laser welding area. The form of the above rough structure is not limited here.

[0053] This embodiment also provides a top cover, such as Figure 4 As shown, the top cover includes a pole (shielded) and an upper plastic (shielded), a top cover sheet 300, and a lower plastic 200 connected in sequence from top to bottom. The pole is sequentially penetrated by the upper plastic, the top cover sheet 300, and the lower plastic 200. The top cover also includes the above-mentioned adapter sheet, and the first welding portion 10 of the adapter sheet is connected to the pole. By using the above-mentioned adapter sheet, the connection between the pole and the first welding portion 10 is reliable and the safety after fusing is higher.

[0054] Alternatively, if Figure 4 As shown, the top cover sheet 300 is provided with a liquid injection hole 310, the lower plastic 200 includes a body 210 and a blocking portion 220, the body 210 and the liquid injection hole 310 are arranged to avoid each other, the blocking portion 220 and the body 210 are connected, and at least part of the blocking portion 220 is directly opposite to the liquid injection hole 310 and is arranged at a distance, and the first welding portion 10 is arranged in contact with the body 210. Through the above arrangement, when injecting liquid, the injected electrolyte can be blocked, and the electrolyte flows from the liquid injection hole 310 and falls on the blocking portion 220, which is equivalent to being buffered by the blocking portion 220 and then falling on the battery cell, thereby preventing the electrolyte from impacting and damaging the internal battery cell.

[0055] In this embodiment, the blocking portion 220 is U-shaped. In other embodiments, the blocking portion 220 may also be L-shaped, which is not limited here.

[0056] Alternatively, if Figure 4 As shown, the second welding part 20 is provided with an avoidance structure, and the avoidance structure is used to avoid the injection hole 310 and / or the blocking part 220. Through the above arrangement, the injection hole 310 or the blocking part 220 plays a role in positioning and limiting the second welding part 20. Optionally, the avoidance structure can be an avoidance groove 21 or an avoidance hole, which is not limited here.

[0057] Embodiment 2

[0058] The adapter sheet of this embodiment is substantially the same as that of the first embodiment, except that Figure 5As shown, the conductive member is constructed as a flat member, wherein: the flat member forms a first accommodating groove on the side of the fuse portion 30 facing the lower plastic 200 (coinciding with the side of the insulating member 50 facing away from the lower plastic 200, not marked). It can be understood that the first accommodating groove is also the accommodating gap 40, and the side of the insulating member 50 facing the lower plastic 200 is accommodated in the first accommodating groove.

[0059] Optionally, the flat plate forms a second receiving groove on the side of the fuse part 30 away from the lower plastic 200 (overlapping with the side of the insulating member 50 close to the lower plastic 200, not marked), and the side of the insulating member 50 away from the lower plastic 200 is accommodated in the second receiving groove and flush with the first welding portion 10. In this way, both sides of the insulating member 50 in the thickness direction can be flush with the first welding portion 10 and the second welding portion 20, so as to ensure the degree of fit between the entire adapter and the lower plastic 200, and further ensure the welding quality of the adapter and the lower plastic 200.

[0060] Optionally, both ends of the insulating member 50 can abut against the first welding portion 10 and the second welding portion 20, and while ensuring the bending strength of the fuse zone 32, the insulating member 50 can be prevented from sliding along the first direction on the fuse zone 32, thereby ensuring full coverage of the fuse zone 32. It is understandable that in the first and second embodiments, the two ends of the insulating member 50 abut against the first welding portion 10 and the second welding portion 20, respectively, except that the form of the insulating member 50 changes with the form of the fuse portion 30.

[0061] 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. The adapter is characterized in that: include: A conductive member, comprising a first welding portion (10), a fuse portion (30) and a second welding portion (20) connected in sequence, wherein the first welding portion (10) and the second welding portion (20) are used to connect to a pole and a pole lug respectively; The insulating member (50) is coated on the outer periphery of the fuse portion (30), and the first welding portion (10) and the second welding portion (20) are both in contact with the side of the lower plastic (200) facing the battery core.

2. The adapter according to claim 1, characterized in that: The fuse portion (30) is arched toward a side away from the lower plastic (200) to form an accommodation gap (40), and the side of the insulating member (50) facing the lower plastic (200) is located in the accommodation gap (40).

3. The adapter according to claim 1, characterized in that: The conductive member is configured as a flat plate, wherein: The flat plate forms a first receiving groove on a side of the fuse portion (30) facing the lower plastic (200), and the insulating member (50) is received in the first receiving groove on a side facing the lower plastic (200); The flat plate forms a second receiving groove on the side of the fuse portion (30) away from the lower plastic (200), and the side of the insulating member (50) away from the lower plastic (200) is received in the second receiving groove and is flush with the first welding portion (10).

4. The adapter according to claim 3, characterized in that: Both ends of the insulating member (50) are in contact with the end surfaces of the first welding portion (10) and the second welding portion (20) facing each other.

5. The adapter according to any one of claims 1 to 4, characterized in that: The connection direction of the first welding part (10) and the second welding part (20) is a first direction, the first welding part (10) and the second welding part (20) are connected via the fuse part (30), the fuse part (30) is provided with a through hole (33), the through hole (33) forms a fuse area (32) on two opposite sides in the second direction, and the total cross-sectional area of ​​the fuse area (32) is 2 mm 2 -10 mm 2 , the first direction and the second direction are set at an angle.

6. The adapter according to any one of claims 1 to 4, characterized in that: The insulating part (50) is an injection molded part, and the fuse part (30) is provided with a flow hole (34) penetrating the thickness direction thereof, and the flow hole (34) is used for allowing injection molding liquid to flow.

7. The adapter according to any one of claims 1 to 4, characterized in that: A rough structure is provided on a side of the first welding portion (10) facing away from the lower plastic (200).

8. A top cover, comprising a pole and an upper plastic, a top cover sheet (300), and a lower plastic (200) connected in sequence from top to bottom, wherein the pole passes through the upper plastic, the top cover sheet (300), and the lower plastic (200) in sequence, characterized in that: It also comprises the adapter plate according to any one of claims 1 to 7, wherein the first welding portion (10) of the adapter plate is connected to the pole.

9. The top cover according to claim 8, characterized in that: The top cover sheet (300) is provided with a liquid injection hole (310); the lower plastic (200) comprises a main body (210) and a blocking portion (220); the main body (210) and the liquid injection hole (310) are arranged to avoid each other; the blocking portion (220) and the main body (210) are connected and at least a portion of the blocking portion (220) and the liquid injection hole (310) are arranged to be spaced apart; and the first welding portion (10) is arranged to fit the main body (210).

10. The top cover according to claim 9, characterized in that: The second welding portion (20) is provided with an avoidance structure, and the avoidance structure is used to avoid the liquid injection hole (310) and / or the blocking portion (220).

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