Over-current protection connecting piece, cover plate assembly and battery

Abstract

The utility model provides an overcurrent protection connecting piece, a cover plate assembly and a battery. The overcurrent protection connecting piece comprises a first connecting body, a second connecting body and a fuse link, the first connecting body and the second connecting body are arranged in a coplanar mode. The fuse link is connected between the first connector and the second connector. Wherein the first connector has a first over-current area, the second connector has a second over-current area, the fuse link has a third over-current area, and the third over-current area is smaller than the first over-current area and the second over-current area. When the current flowing through the overcurrent protection connecting piece is continuously overloaded, the heat generated by the fuse link is far greater than the heat generated by other parts of the overcurrent protection connecting piece, and the fuse link can be firstly disconnected due to the minimum third overcurrent area, so that the internal circuit of the battery can be disconnected; therefore, the situation of thermal runaway in the battery caused by current overload can be avoided in time.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a kind of overcurrent protection connecting piece, cover plate assembly and battery. BACKGROUND

[0002] Lithium ion battery has the advantages of high energy density, high power density, multiple cycle times, long storage time, etc., and has been widely used in electric bicycles, electric vehicles and other electric vehicles. Among them, the connecting piece inside the lithium ion battery is an element for connecting the tab and the pole, which is provided on the cover plate of the battery, and plays a crucial role in the safety and power stability of the lithium ion battery.

[0003] In related technologies, the current-carrying capacity of the connecting piece connected to each battery cell is not analyzed and verified separately, and the current-carrying capacity of the connecting piece is far beyond the short-circuit current of a single battery cell. Therefore, when overcharging, overdischarging or micro-short circuit occurs in a battery cell inside the battery pack, the abnormal battery cell will further heat runaway and the entire battery pack will have a chain reaction heat runaway, resulting in a safety accident of an electric vehicle. This not only causes property damage, but also may cause personal injury. Therefore, the safety problem of lithium ion battery pack has become one of the key factors affecting the development of the emerging market of lithium ion battery. SUMMARY

[0004] The embodiments of the utility model provide an overcurrent protection connecting piece, cover plate assembly and battery, which can improve the problem of battery heat runaway caused by excessive current-carrying capacity of the connecting piece in related technologies.

[0005] In a first aspect, the embodiments of the utility model provide an overcurrent protection connecting piece applied to a battery, comprising:

[0006] a first connecting body;

[0007] a second connecting body disposed coplanarly with the first connecting body; and

[0008] a fuse connected between the first connecting body and the second connecting body,

[0009] wherein the first connecting body has a first overcurrent area, the second connecting body has a second overcurrent area, and the fuse has a third overcurrent area, and the third overcurrent area is smaller than the first overcurrent area and the second overcurrent area.

[0010] In an embodiment, the first connecting body includes a first end face facing the fuse, the second connecting body includes a second end face facing the fuse, and the fuse includes a third end face connected to the first connecting body and a fourth end face connected to the second connecting body.

[0011] The first end surface is larger than the third end surface, and the second end surface is larger than the fourth end surface.

[0012] In an embodiment, the first end surface comprises a first middle portion and first and second end portions oppositely arranged on two sides of the first middle portion, and the second end surface comprises a second middle portion and third and fourth end portions oppositely arranged on two sides of the second middle portion.

[0013] The third end surface connects the first middle portion, the fourth end surface connects the second middle portion, the first end portion and the third end portion are oppositely and spacedly arranged, and the second end portion and the fourth end portion are oppositely and spacedly arranged.

[0014] In an embodiment, a ratio of a sum of areas of the first and second end portions to the third overcurrent area is between 0.5 and 8; and / or

[0015] A spacing between the first end portion and the third end portion is greater than or equal to 1 mm, and / or a spacing between the second end portion and the fourth end portion is greater than or equal to 1 mm.

[0016] In an embodiment, the fuse body comprises two spacedly arranged fuse members, the first end surface comprises a first middle portion and first and second end portions oppositely arranged on two sides of the first middle portion, the first middle portion is arranged staggered with the fuse members, and the first and second end portions are connected to the second connecting body through the fuse members respectively.

[0017] In an embodiment, the second connecting body comprises two connecting ears, each of which is connected to the fuse member.

[0018] In an embodiment, a ratio of an area of the first middle portion to a sum of two third overcurrent areas is between 0.5 and 8; and / or

[0019] A spacing between the first middle portion and the second middle portion of the second end surface is greater than or equal to 1 mm.

[0020] In an embodiment, the second connecting body further comprises a second connecting body, which is connected between the two connecting ears, and the second connecting body is arranged spacedly apart from the first middle portion.

[0021] In an embodiment, the first connecting body and / or the second connecting body has a first thickness, and the fuse body has a second thickness,

[0022] The second thickness is less than the first thickness.

[0023] In an embodiment, a minimum value of the second thickness is less than or equal to 1 / 2 of the first thickness.

[0024] In an embodiment, the overcurrent protection connector further comprises an electrical connecting body for electrically connecting the electrical components of the external device, the electrical connecting body protruding from one side of the first connecting body along the thickness direction of the first connecting body; the first end surface is arc-shaped and curved away from the electrical connecting body.

[0025] In a second aspect, the embodiments of the utility model provide a cover plate assembly applied to a battery, the cover plate assembly comprising:

[0026] a cover plate; and

[0027] an overcurrent protection connector, the overcurrent protection connector being the overcurrent protection connector described in any of the embodiments of the utility model, and at least part of the first connecting body being mounted on the cover plate.

[0028] In a third aspect, the embodiments of the utility model provide a battery comprising:

[0029] a battery body; and

[0030] a cover plate assembly, the cover plate assembly being the cover plate assembly described in any of the embodiments of the utility model, and the cover plate assembly being arranged at one end of the battery body.

[0031] The embodiments of the utility model have the beneficial effects that: the fuse body is connected between the first connecting body and the second connecting body, and the third overcurrent area of the fuse body is smaller than the first overcurrent area of the first connecting body and the second overcurrent area of the second connecting body, so that the resistance value of the fuse body at the position near the third overcurrent area is greater than the resistance value of other positions of the overcurrent protection connector; when the current flowing through the overcurrent protection connector is continuously overloaded, the heat generated by the fuse body will be much greater than the heat generated by other positions of the overcurrent protection connector; since the third overcurrent area is the smallest, the fuse body can be disconnected first, so that the internal circuit of the battery can be disconnected, and thus the situation of thermal runaway in the battery caused by current overload can be avoided in time; in addition, the first connecting body and the second connecting body are arranged in the same plane, which is also conducive to reducing the space occupied by the overcurrent protection connector in the thickness direction. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0033] Figure 1 is the structural schematic view of the overcurrent protection connector provided by the first embodiment of the utility model;

[0034] Figure 2 is a structural schematic view of the overcurrent protection connecting piece provided by the second embodiment of the utility model, and

[0035] Figure 3 is a structural schematic view of the overcurrent protection connecting piece provided by the third embodiment of the utility model, and

[0036] Figure 4 is a structural schematic view of the overcurrent protection connecting piece provided by the fourth embodiment of the utility model, and

[0037] Figure 5 is a side schematic view of the overcurrent protection connecting piece provided by the fourth embodiment of the utility model, and

[0038] Figure 6 is Figure 5 an enlarged schematic view of A part in the middle,

[0039] Figure 7 is an exploded schematic view of the cover plate assembly provided by the embodiment of the utility model.

[0040] Mark explanation:

[0041] 1, overcurrent protection connecting piece; 101, first side; 102, second side; 103, first notch; 104, second notch; 105, slot hole;

[0042] 10, first connecting body; S1, first overcurrent area; h1, first thickness; 11, first end face; 111, first middle part; 112, first end part; 113, second end part;

[0043] 20, second connecting body; S2, second overcurrent area; h2, second thickness; 21, second end face; 211, second middle part; 212, third end part; 213, fourth end part;

[0044] 22, connecting lug; 23, second connecting body; 30, fuse body; S3, third overcurrent area; 310, fuse piece; 31, third end face; 32, fourth end face; 33, first side; 34, second side;

[0045] 40, electric connecting body; 100, cover plate assembly; 2, cover plate. Specific implementation

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing in the drawings. And "inner" and "outer" refer to the outline of the device.

[0047] During use, the battery system can cause internal short circuit of the battery due to various reasons, and the battery system includes a plurality of batteries, and each battery needs to be electrically connected through a connecting piece. In order to prevent the battery from being out of control and causing fire and explosion, an insurance needs to be designed on the battery, which can quickly cut off the connection between the battery and the external circuit when the internal short circuit of the battery occurs, thereby improving the safety and reliability of the power battery.

[0048] Therefore, the application provides an overcurrent protection connecting piece 1 applied to a battery. It can be understood that the overcurrent protection connecting piece 1 provided by the application can be applied to various types of batteries including lithium ion batteries and sodium ion batteries.

[0049] For details, please refer to Figure 1 , Figure 1 The structural schematic diagram of the overcurrent protection connecting piece provided by the first embodiment of the application. The overcurrent protection connecting piece 1 can include a first connecting body 10, a second connecting body 20 and a fuse body 30. The first connecting body 10 is used to connect external electrical components, and the second connecting body 20 is used to connect the tab inside the battery. The first connecting body 10 and the second connecting body 20 are coplanar. The fuse body 30 is connected between the first connecting body 10 and the second connecting body 20. The first connecting body 10 can have a first overcurrent area S1, the second connecting body 20 can have a second overcurrent area S2, and the fuse body 30 can have a third overcurrent area S3. The third overcurrent area S3 is smaller than the first overcurrent area S1 and the second overcurrent area S2. When the current flowing through the overcurrent protection connecting piece 1 is continuously too large (in some embodiments, it is called overload or overcurrent), the fuse body 30 with the smallest overcurrent area heats and melts, thereby disconnecting the electrical connection between the first connecting body 10 and the second connecting body 20.

[0050] It should be noted that the first flow area S1, the second flow area S2 and the third flow area S3 are three current flow areas along the thickness direction of the overcurrent protection connecting piece 1, wherein the first flow area S1 corresponds to the area of the smallest current flow cross section in the first connecting body 10, the first flow area S1 can be located at the connection between the first connecting body 10 and the fuse body 30, the second flow area S2 corresponds to the area of the smallest current flow cross section in the second connecting body 20, the second flow area S2 can be located at the connection between the second connecting body 20 and the fuse body 30, and the third flow area S3 corresponds to the area of the smallest current flow cross section in the fuse body 30.

[0051] The overcurrent protection connecting piece 1 provided by the embodiment is connected between the first connecting body 10 and the second connecting body 20 through the fuse body 30, and the third flow area S3 of the fuse body 30 is smaller than the first flow area S1 of the first connecting body 10 and the second flow area S2 of the second connecting body 20, so that the resistance value of the fuse body 30 at the position near the third flow area S2 is greater than the resistance value of other positions of the overcurrent protection connecting piece 1. When the current flowing through the overcurrent protection connecting piece 1 is overloaded, the heat generated by the fuse body 30 will be much greater than the heat generated by other positions of the overcurrent protection connecting piece 1 such as the first connecting body 10 and the second connecting body 20. Since the third flow area S3 is the smallest, the fuse body 30 can be disconnected first, thereby the internal circuit of the battery can be disconnected, and the situation of thermal runaway in the battery caused by current overload can be avoided in time. In addition, by arranging the first connecting body 10 and the second connecting body 20 to be coplanar, the occupied space of the overcurrent protection connecting piece 1 in the thickness direction can be reduced. Please refer to Figures 1 to 3 , Figure 2 The structure diagram of the overcurrent protection connecting piece provided by the second embodiment of the present application is shown in Figure 3 The structure diagram of the overcurrent protection connecting piece provided by the third embodiment of the present application is shown in. In some embodiments of the present application, the first connecting body 10 can include a first end face 11 facing the fuse body 30, the second connecting body 20 can include a second end face 21 facing the fuse body 30, the fuse body 30 can include a third end face 31 connected with the first connecting body 10 and a fourth end face 32 connected with the second connecting body 20, and the first end face 11 is greater than the third end face 31, and the second end face 21 is greater than the fourth end face 32. Specifically, in this embodiment, the first connecting body 10, the second connecting body 20 and the fuse body 30 can have the same thickness and be arranged coplanarly. Along the thickness direction of the fuse body 30, the third end face 31 of the fuse body 30 can coincide with at least part of the first end face 11, and the fourth end face 32 of the fuse body 30 can coincide with at least part of the second end face 21.

[0052] Please refer to Figure 1As an optional embodiment, the first end surface 11 can include a first middle portion 111 and first and second end portions 112 and 113 oppositely arranged at two sides of the first middle portion 111, the second end surface 21 can include a second middle portion 211 and third and fourth end portions 212 and 213 oppositely arranged at two sides of the second middle portion 211, the third end surface 31 is connected to the first middle portion 111, the fourth end surface 32 is connected to the second middle portion 211, the first end portion 112 and the third end portion 212 are oppositely and spacedly arranged, and the second end portion 113 and the fourth end portion 213 are oppositely and spacedly arranged. In other words, the overcurrent protection connector 1 can include first and second edges 101 and 102 oppositely arranged, the first edge 101 can be provided with a first notch 103 in a direction from the first edge 101 to the second edge 102, and the second edge 102 can be provided with a second notch 104 in a direction from the second edge 102 to the first edge 101, so that a portion of the overcurrent protection connector 1 between the first notch 103 and the second notch 104 is narrower than other portions of the overcurrent protection connector 1, and when overcurrent continuously flows in the overcurrent protection connector 1 for a preset time, the fuse 30 between the first notch 103 and the second notch 104 can be fused, thereby cutting off the electrical connection between the first connecting body 10 and the second connecting body 20.

[0053] Please refer to Figure 2 and Figure 3 Optionally, the fuse 30 can include two fuses 310 spacedly arranged, the first end surface 11 can include a first middle portion 111 and first and second end portions 112 and 113 oppositely arranged at two sides of the first middle portion 111, the first middle portion 111 is arranged staggeredly with the fuses 310, and the first and second end portions 112 and 113 are respectively connected to the second connecting body 20 through a fuse 310. As Figure 2 In one embodiment, the second connecting body 20 can include two connecting ears 22, each connecting ear 22 is connected to a fuse 310, in other words, the two connecting ears 22 are oppositely and spacedly arranged, and a larger space is formed between the two connecting ears 22, the overcurrent protection connector 1 provided in this embodiment can ensure the tab welding area while using less material, achieve the overcurrent protection effect, and be conducive to the lightweight design of the overcurrent protection connector 1. As Figure 3In another embodiment, the second connecting body 20 can further comprise a second connecting body 23 connected between the two connecting ears 22, and the second connecting body 23 is spaced apart from the first middle part 111, in other words, the overcurrent protection connecting piece 1 can be provided with a slot hole 105 between the first edge 101 and the second edge 102, and each of the slot hole 105 and the first edge 101 and the slot hole 105 and the second edge 102 forms a fuse 310, so that the overcurrent protection connecting piece 1 is narrower at the positions close to both sides of the slot hole 105 than other positions of the overcurrent protection connecting piece 1. In this embodiment, connecting the second connecting body 23 to the two connecting ears 22 helps to improve the structural rigidity of the two connecting ears 22 and reduce the risk of bending deformation under external force, thereby ensuring the reliability and stability of the connecting ears 22.

[0054] Please refer to Figure 1 and Figure 2 The overcurrent protection connecting piece 1 provided by the first and second embodiments of the present application, the first slot 103, the second slot 104 and the slot hole 105 can be a through slot design. The inventor has found through experiments and long-term practice that the ratio of the sum of the areas of the first end part 112 and the second end part 113 to the third overcurrent area S3 can be between 0.5 and 8, or the ratio of the area of the first middle part 111 to the sum of the two third overcurrent areas S3 can be between 0.5 and 8, so that the overcurrent protection connecting piece 1 has good fusing performance. When the current continuously exceeds the allowed set range value, the fuse 30 can be preferentially disconnected at the third overcurrent area S3 to avoid thermal runaway of the battery to which the overcurrent protection connecting piece 1 is applied. For example, in the second embodiment, if the ratio of the area of the first middle part 111 to the sum of the two third overcurrent areas S3 exceeds 20, the strength of the overcurrent protection connecting piece 1 is likely to be reduced, resulting in difficult processing, difficult assembly, and the fuse 30 is prone to breakage. In addition, the third overcurrent area S3 is too small, which increases the internal resistance at the position of the third overcurrent area S3, and the overcurrent protection connecting piece 1 is prone to premature fusing, which affects the performance of the battery itself.

[0055] In the implementation of the first and second embodiments of the present application, the inventors have also found that if the width of the first notch 103 is greater than or equal to 1 mm, and / or the width of the second notch 104 is greater than or equal to 1 mm, and / or the width of the slot hole 105 is greater than or equal to 1 mm, the situation that the fuse does not melt after the working current reaches the overload current value due to the too small width of the slot hole 105 can be avoided. For example, in some embodiments, the width of the first notch 103 can be greater than or equal to 1 mm, the width of the second notch 104 can be greater than or equal to 1 mm, and the width of the slot hole 105 can be greater than or equal to 1 mm. In some embodiments, the width of the first notch 103 can be greater than or equal to 1 mm, or the width of the second notch 104 can be greater than or equal to 1 mm, or the width of the slot hole 105 can be greater than or equal to 1 mm. That is, the above-mentioned several designs can coexist, or one of the designs or a combination of several designs, and the present specification does not exhaustively enumerate the combination of the above-mentioned several designs.

[0056] It should be noted that the width of the first notch 103 refers to the distance between the first end portion 112 and the third end portion 212, the width of the second notch 104 refers to the distance between the second end portion 113 and the fourth end portion 213, and the width of the slot hole 105 refers to the distance between the first middle portion 111 and the second middle portion 211. Please refer to Figures 4 to 6 , Figure 4 The structure schematic diagram of the overcurrent protection connecting piece provided by the fourth embodiment of the present application, Figure 5 The side view schematic diagram of the overcurrent protection connecting piece provided by the fourth embodiment of the present application, Figure 6 The structure schematic diagram of the overcurrent protection connecting piece provided by the fourth embodiment of the present application, Figure 5 The enlarged schematic diagram of the A part in FIG. 8. As an optional implementation, the first connecting body 10 and / or the second connecting body 20 has a first thickness h1, and the fuse body 30 has a second thickness h2, and the second thickness h2 is less than the first thickness h1. For example, in some embodiments, the first connecting body 10 and the second connecting body 20 have a first thickness h1, and the fuse body 30 has a second thickness h2, and the second thickness h2 is less than the first thickness h1, or in other embodiments, the first connecting body 10 or the second connecting body 20 has a first thickness h1, and the fuse body 30 has a second thickness h2, and the second thickness h2 is less than the first thickness h1. In other words, along the thickness direction of the overcurrent protection connecting piece 1, the local area of the overcurrent protection connecting piece 1 can be designed to be thinner than other areas thereof, so as to increase the resistance value of the local area, so that the local area can overheat and melt when the current overflows.

[0057] In some optional embodiments, the minimum value of the second thickness h2 is less than or equal to 1 / 2 of the first thickness h1. Specifically, along the thickness direction of the fuse 30, the fuse 30 can include a first side 33 and a second side 34 arranged oppositely, and in some embodiments, the first side 33 and the second side 34 can be parallel planes so that the thickness of the fuse 30 is uniform, and in this embodiment, the thickness of the fuse 30 is less than or equal to 1 / 2 of the thickness of the first connecting body 10 and / or the second connecting body 20; in other embodiments, the first side 33 and the second side 34 can be two surfaces that are not parallel, for example, one side can be a plane, and the other side can be a curved surface that is curved toward the plane or a folded surface that is concave toward the plane, or both sides are curved surfaces or folded surfaces, or one side is a curved surface and the other side is a folded surface, so that the thickness of the fuse 30 is not uniform in the direction from the first connecting body 10 to the second connecting body 20, wherein the end of the fuse 30 close to the first connecting body 10 and / or the second connecting body 20 has a greater thickness value than the middle part between the two ends of the fuse 30. For example, the thickness of the two ends of the fuse 30 can be close to or equal to the thickness of the first connecting body 10 and / or the second connecting body 20, and the thickness of the middle part of the fuse 30 is less than or equal to 1 / 2 of the thickness of the first connecting body 10 and / or the second connecting body 20, that is, the current flow area of the fuse 30 gradually decreases from the two ends to the middle part, and one aspect of the design is to gradually change the heat, so that when the current is continuously overloaded, the thinnest part of the fuse 30 (i.e., the middle part of the fuse 30) has the most heat, and the thinnest area can be melted first to quickly disconnect the electrical connection inside the battery.

[0058] As an optional embodiment, the width of the fuse 30 can be reduced based on the reduction of the thickness of the fuse 30, or the thickness of the fuse 30 can be reduced based on the reduction of the width of the fuse 30, so that the third overcurrent area of the fuse 30 can be greatly reduced, the resistance value of the fuse 30 near the third overcurrent area is increased, so that when the current overflows, the fuse 30 can generate more heat to timely disconnect the electrical connection between the first connecting body 10 and the second connecting body 20, and prevent thermal runaway inside the battery.

[0059] The overcurrent protection connecting piece 1 further comprises an electrical connecting body 40, which is used to electrically connect internal and external electrical components. For example, the electrical connecting body 40 can be used to electrically connect bus bars or can be used to electrically connect electrode columns. In the thickness direction of the first connecting body 10, the electrical connecting body 40 is protruded from one side of the first connecting body 10, and the first end surface 11 is curved in a direction away from the electrical connecting body 40. In the embodiment of the present application, the first connecting body 10, the second connecting body 20, the fuse body 30 and the electrical connecting body 40 can be integrally formed. The first edge 101 and the second edge 102 of the overcurrent protection connecting piece 1 can be arranged in a non-parallel manner. The first end surface 11 is connected between the first edge 101 and the second edge 102. The width of the portion of the first connecting body 10 between the first edge 101 and the second edge 102 gradually decreases in a direction away from the second connecting body 20 from the first end surface 11. The electrical connecting body 40 is protruded from one side of the first connecting body 10 in the thickness direction. The distance from the electrical connecting body 40 to the first edge 101 and the second edge 102 can be equal. In this way, the current flow area of the first connecting body 10 gradually decreases in a direction from the first end surface 11 to the electrical connecting body 40. This design can prevent thermal stress concentration, relieve the warping deformation of the first connecting body 10, and enable the first connecting body 10 to establish good electrical contact with internal and external electrical components.

[0060] Referring to Figure 7 , Figure 7 An exploded schematic view of the cover plate assembly is provided in the embodiment of the present application. The embodiment of the present application further provides a cover plate assembly 100 applied to a battery. The cover plate assembly 100 can comprise a cover plate 2 and an overcurrent protection connecting piece 1. The overcurrent protection connecting piece 1 is the overcurrent protection connecting piece 1 provided in any embodiment of the present application. At least part of the first connecting body 10 is mounted on the cover plate 2.

[0061] The embodiment of the present application further provides a battery, which comprises a battery body and a cover plate assembly 100. The cover plate assembly 100 is arranged at one end of the battery body.

[0062] In summary, the overcurrent protection connecting piece, the cover plate assembly and the battery provided by the embodiments of the present application have the following beneficial effects: first, by connecting the fuse between the first connecting body and the second connecting body, and by making the third overcurrent area of the fuse smaller than the first overcurrent area of the first connecting body and the second overcurrent area of the second connecting body, the resistance value of the fuse at the position near the third overcurrent area is greater than the resistance value of other positions of the overcurrent protection connecting piece; when the current flowing through the overcurrent protection connecting piece is continuously overloaded, the heat generated by the fuse will be much greater than the heat generated by other positions of the overcurrent protection connecting piece; since the third overcurrent area is the smallest, the fuse can be disconnected first, thereby the internal circuit of the battery can be disconnected, and thus the situation that the battery internally occurs thermal runaway due to current overload can be avoided in time; second, by making the width of the part of the first connecting body between the first edge and the second edge gradually smaller in the direction away from the second connecting body, and by making the distance from the first edge to the second edge of the electric connecting body equal, the current flow area of the first connecting body in the direction close to the electric connecting body from the first end surface can be gradually reduced, which can effectively prevent thermal stress concentration, relieve the warping deformation of the first connecting body, and make the first connecting body form a good electrical contact.

[0063] The embodiments of the present application are described in detail above, and the principles and implementation modes of the present application are described by applying specific examples; the above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges will be changed, and the above description of the present application should not be understood as a limitation of the present application.

Claims

1. An overcurrent protection connector, applied to a battery, characterized in that: include: a first connector; a second connector, arranged coplanar with the first connector; as well as a fuse connected between the first connector and the second connector, The first connecting body has a first flow area, the second connecting body has a second flow area, the fuse has a third flow area, and the third flow area is smaller than the first flow area and the second flow area.

2. The overcurrent protection connector according to claim 1, characterized in that: The first connector includes a first end surface facing the fuse, and the second connector includes a second end surface facing the fuse; the fuse includes a third end surface connected to the first connector, and a fourth end surface connected to the second connector; The first end surface is larger than the third end surface, and the second end surface is larger than the fourth end surface.

3. The overcurrent protection connector according to claim 2, characterized in that: The first end surface includes a first middle portion and a first end portion and a second end portion oppositely disposed on two sides of the first middle portion; the second end surface includes a second middle portion and a third end portion and a fourth end portion oppositely disposed on two sides of the second middle portion; The third end surface is connected to the first middle portion, the fourth end surface is connected to the second middle portion, the first end portion and the third end portion are opposite to each other and spaced apart, and the second end portion and the fourth end portion are opposite to each other and spaced apart.

4. The overcurrent protection connector according to claim 3, characterized in that: The ratio of the sum of the areas of the first end and the second end to the third flow area is between 0.5 and 8; and / or The distance between the first end and the third end is greater than or equal to 1 mm, and / or the distance between the second end and the fourth end is greater than or equal to 1 mm.

5. The overcurrent protection connector according to claim 2, characterized in that: The fuse includes two fuse elements arranged at intervals, the first end surface includes a first middle portion and a first end portion and a second end portion arranged opposite to each other on both sides of the first middle portion, the first middle portion and the fuse elements are staggered, and the first end portion and the second end portion are respectively connected to the second connector through one of the fuse elements.

6. The overcurrent protection connector according to claim 5, characterized in that: The second connecting body includes two connecting ears, and each connecting ear is connected to one of the fuse elements.

7. The overcurrent protection connector according to claim 6, characterized in that: The ratio of the area of ​​the first middle portion to the sum of the two third flow areas is between 0.5 and 8; and / or, A distance between the first middle portion and the second middle portion of the second end surface is greater than or equal to 1 mm.

8. The overcurrent protection connector according to claim 6, characterized in that: The second connector further includes a second connecting body, which is connected between the two connecting ears and is spaced apart from the first middle portion.

9. The overcurrent protection connector according to claim 1, characterized in that: The first connector and / or the second connector has a first thickness, and the fuse has a second thickness. The second thickness is smaller than the first thickness.

10. The overcurrent protection connector according to claim 9, characterized in that: A minimum value of the second thickness is less than or equal to 1 / 2 of the first thickness.

11. The overcurrent protection connector according to any one of claims 2 to 8, characterized in that: The overcurrent protection connector also includes an electrical connector, which is used to electrically connect to external electrical components. Along the thickness direction of the first connector, the electrical connector is protruded on one side of the first connector; the first end face is arc-shaped and is bent in a direction away from the electrical connector.

12. A cover plate assembly, applied to a battery, characterized in that: include: cover; as well as An overcurrent protection connector, wherein the connector is the overcurrent protection connector according to any one of claims 1 to 11, and at least a portion of the first connector is installed on the cover plate.

13. A battery, characterized in that: include: Battery body; as well as A cover plate assembly, wherein the cover plate assembly is the cover plate assembly according to claim 12, and the cover plate assembly is arranged at one end of the battery body.

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