Connecting terminal, cover plate assembly, battery and electric device

Abstract

The utility model provides a connecting terminal, a cover plate assembly, a battery and an electric device. The connecting terminal comprises a first connecting part and a second connecting part, the first surface of the first connecting part is suitable for being electrically connected with a tab, the second surface of the first connecting part is integrally connected with a second connecting part, the second connecting part protrudes out of the second surface, and the first surface deviates from the second surface; the surface, deviating from the first connecting part, of the second connecting part is suitable for being electrically connected with the pole, and a connecting bulge is arranged on the surface, deviating from the first connecting part, of the second connecting part and is suitable for being embedded in the pole. Therefore, the first connecting part and the second connecting part are integrally connected and molded, the resistance between the first connecting part and the second connecting part caused by a welding process is reduced, and the through-current capability of the connecting terminal is improved. In addition, the connecting protrusion is embedded in the pole, so that the fixing force of the pole on the connecting terminal is enhanced, the welding area is increased, and the through-current capacity between the connecting terminal and the pole is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and specifically relates to a connecting terminal, a cover plate assembly, a battery and an electrical device. Background Art

[0002] With the rapid development of electric vehicle technology and the gradual popularization of electric vehicles, the requirements for the performance of electric vehicle power batteries are gradually increasing, requiring them to have high specific energy, high specific power, fast charging and deep discharge performance, and the improvement of the current carrying capacity of the cover plate and the pole is crucial.

[0003] In the related art, the connecting piece is welded to the pole ear of the battery cell, and a connecting column is welded on the connecting piece, and the connecting column is welded to the pole platform, that is, a current path is formed between the battery cell and the pole platform through the welding structure of the connecting piece and the connecting column.

[0004] The related technology has the following defects: the welding between the connecting piece and the connecting column will increase the resistance at the battery cover and reduce the current carrying capacity. Utility Model Content

[0005] The purpose of the embodiments of the utility model is to provide a connecting terminal, a cover plate assembly, a battery and an electrical device, which can solve the problem in the related art that the welding of the connecting piece and the connecting column will increase the resistance at the battery cover plate and reduce the current carrying capacity.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] In a first aspect, an embodiment of the utility model provides a connection terminal, wherein the connection terminal comprises a first connection portion and a second connection portion;

[0008] The first surface of the first connection portion is suitable for electrically connecting to the electrode lug, the second surface of the first connection portion is integrally connected with the second connection portion, the second connection portion protrudes from the second surface, and the first surface and the second surface are opposite to each other;

[0009] The surface of the second connection portion facing away from the first connection portion is suitable for being electrically connected to the pole, and the surface of the second connection portion facing away from the first connection portion is provided with a connection protrusion, and the connection protrusion is suitable for being embedded in the pole.

[0010] Optionally, the first surface and the second surface are distributed along a first direction, a height of the second connection portion parallel to the first direction is a, a length of the second connection portion perpendicular to the first direction is b, and b≥a.

[0011] Optionally, a surface of the second connecting portion facing away from the first connecting portion is provided with at least two connecting protrusions.

[0012] Optionally, the connecting terminal further includes an alloy connecting piece;

[0013] The alloy connecting piece is electrically connected to the surface of the second connecting part away from the first connecting part. A through hole is formed on the alloy connecting piece. The connecting protrusion passes through the through hole. The alloy connecting piece is suitable for being electrically connected to the pole at the negative terminal.

[0014] In a second aspect, an embodiment of the utility model further provides a cover plate assembly, comprising a cover plate, a pole and any one of the above-mentioned connection terminals;

[0015] The first connecting portion is located on one side of the cover plate, the pole is located on the other opposite side of the cover plate, and a first through hole is formed on the cover plate;

[0016] The second connecting portion is inserted into and fixed in the first through hole and is electrically connected to the pole.

[0017] Optionally, a groove is provided on the surface of the pole facing the cover plate;

[0018] The connecting protrusion is embedded in the groove.

[0019] Optionally, the cover plate assembly further comprises a first insulating member;

[0020] The first insulating member is connected between the pole and the cover plate to insulate and isolate the pole from the cover plate.

[0021] Optionally, the cover plate assembly further comprises a sealing member;

[0022] The sealing member is sealingly connected between the first insulating member and the cover plate.

[0023] Optionally, a protrusion is provided on the edge of the pole;

[0024] The protrusion is welded to a side of the first insulating member facing the pole.

[0025] Optionally, the cover plate assembly further includes a second insulating member;

[0026] The second insulating member is connected between the cover plate and the first connecting portion to insulate and isolate the cover plate from the connecting terminal.

[0027] In a third aspect, an embodiment of the utility model further provides a battery, comprising the cover plate assembly described in any one of the above embodiments;

[0028] The tab of the battery cell is electrically connected to the first surface of the first connecting portion.

[0029] In a fourth aspect, an embodiment of the utility model further provides an electrical device, comprising the battery described in one of the above embodiments.

[0030] The connection terminal provided by the embodiment of the utility model includes a first connection part and a second connection part, wherein the first surface of the first connection part is used to electrically connect with the pole ear, the second surface of the first connection part is integrally connected with the second connection part, the second connection part protrudes from the second surface, and the first surface and the second surface are two surfaces that are separated from each other. In other words, the second connection part is integrally connected with the first connection part, and compared with the related art of welding connection between the connection piece and the connection column, the first connection part of the utility model, i.e., the connection piece, and the second connection part, i.e., the connection column, are integrally connected and formed, and the welding process between the two is cancelled, thereby reducing the process steps. More importantly, the welding resistance between the connection column and the connection piece is reduced, thereby reducing the resistance of the battery cell top cover part and the battery as a whole, and improving the flow capacity of the connection terminal and the battery. At the same time, since the second connection part is integrally connected to the second surface of the first connection part, it does not affect the welding area of ​​the first surface of the first connection part, increases the welding area between the first connection part and the battery cell pole ear, improves the flow capacity between the connection terminal and the pole ear, and thereby improves the flow capacity of the battery cell. In addition, a connection protrusion is provided on the surface of the second connection part away from the first connection part, and when the connection protrusion is embedded and fixed in the pole, the connection terminal is electrically connected to the pole. This not only strengthens the fixing force of the pole for the connection terminal, but also increases the welding area and improves the current carrying capacity between the connection terminal and the pole.

[0031] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 This is an exploded view of the positive electrode cover plate assembly structure provided by an embodiment of the utility model;

[0034] Figure 2 It is a plan view of the positive electrode cover plate assembly provided by an embodiment of the utility model;

[0035] Figure 3 This utility model embodiment Figure 2 Section view along AA direction;

[0036] Figure 4 This utility model embodiment Figure 2Section view along BB direction;

[0037] Figure 5 This utility model embodiment Figure 3 A partial enlarged schematic diagram of the middle Ⅰ position;

[0038] Figure 6 It is an exploded view of the structure of the negative electrode cover plate assembly provided in an embodiment of the utility model;

[0039] Figure 7 It is a plan view of the negative electrode cover plate assembly provided by an embodiment of the utility model;

[0040] Figure 8 This utility model embodiment Figure 7 Sectional view along CC direction;

[0041] Fig. 9 This utility model embodiment Figure 7 Sectional view along DD direction;

[0042] Fig.10 This utility model embodiment Figure 8 A partial enlarged schematic diagram of the middle II position.

[0043] Description of reference numerals:

[0044] 1-connecting terminal, 11-first connecting part, 12-second connecting part, 121-connecting protrusion, 13-alloy connecting piece, 131-fifth through hole, 2-pole, 21-groove, 22-protrusion, 3-cover plate, 31-first through hole, 32-liquid injection hole, 4-first insulating member, 41-second through hole, 5-sealing member, 51-third through hole, 6-second insulating member, 61-fourth through hole, 71-liquid injection hole sealing cover, 72-sealing nail, 73-sealing ring, 8-pressure relief valve, Z-first direction. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0047] The connection terminal, cover assembly, battery and electrical device provided in the embodiment of the utility model are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0048] The utility model embodiment provides a connecting terminal, referring to Figure 1 and Figure 6 The connecting terminal 1 includes a first connecting portion 11 and a second connecting portion 12; the first surface of the first connecting portion 11 is suitable for electrically connecting to the pole ear, the second surface of the first connecting portion 11 is integrally connected with the second connecting portion 12, the second connecting portion 12 protrudes from the second surface, and the first surface and the second surface are opposite to each other; the surface of the second connecting portion 12 opposite to the first connecting portion 11 is suitable for electrically connecting to the pole 2, and the surface of the second connecting portion 12 opposite to the first connecting portion 11 is provided with a connecting protrusion 121, and the connecting protrusion 121 is suitable for being embedded in the pole 2.

[0049] Specifically, if Figure 1 and Figure 6As shown, the connection terminal 1 includes a first connection part 11 and a second connection part 12. When the connection terminal 1 is used in a battery cell, the first surface of the first connection part 11, i.e., the lower surface, is used to electrically connect to the battery cell tab, and the top surface of the second connection part 12 is electrically connected to the pole 2, and the electrical connection is usually in the form of welding. The second surface, i.e., the upper surface, of the first connection part 11 is extended with the second connection part 12, i.e., the second connection part 12 is integrally connected to the second surface of the first connection part 11. The first surface and the second surface of the first connection part 11 are distributed along the Z direction, the second connection part protrudes from the second surface, and the height direction of the second connection part is along the Z direction. Among them, in order to adapt to the installation space of the battery cell top cover area, the first connecting part 11 is a sheet structure, so the first connecting part 11 is also called a connecting sheet; the second connecting part 12 is a columnar structure, so the second connecting part 12 is also called a connecting column, perpendicular to the Z direction, the cross section of the second connecting part 12 is a closed figure formed by the tangent connection of a straight line and a curve, or a closed figure formed by the connection between curves. Specifically, the cross section of the second connecting part 12 can be circular, elliptical, or arc-shaped on both sides, with a straight line in the middle. The cross-sectional size of the first connecting part 11 is larger than the cross-sectional size of the second connecting part 12. The first connection part 11 and the second connection part 12 are integrally connected and formed, and the forming process includes but is not limited to cold heading or turning. When the connection terminal 1 is a positive terminal, the forming process is cold heading. Cold heading is a processing method that utilizes the plastic deformation of metal under the action of external force, and with the help of a mold, the metal volume is redistributed and transferred to form the required parts or blanks. Since it is carried out at room temperature, the mechanical properties of metal parts can be improved, and compared with the welding process, its material utilization rate and production efficiency are higher. When the connection terminal 1 is a negative terminal, the forming process is turning, which is to cut the workpiece into the required shape and size through a machine tool or lathe. The connection terminal 1 processed by the integral forming process cancels the welding process between the first connection part 11 and the second connection part 12, reduces the process steps, reduces the resistance between the first connection part 11 and the second connection part 12 caused by the welding process, and improves the current carrying capacity of the connection terminal and the battery cell. In addition, in the related technology using welding connection, due to the large laser welding energy between the first connection part 11 and the second connection part 12, the first connection part 11 will be penetrated to form a weld mark, and the weld mark area cannot be welded to the pole ear again, affecting the welding area between the lower surface of the first connection part 11 and the pole ear. In the present embodiment, since the second connection part 12 is integrally connected to the second surface of the first connection part 11, no weld mark will be formed on the first surface of the first connection part 11, thereby increasing the welding area between the first connection part 11 and the pole ear and improving the current carrying capacity of the pole ear and the battery cell.

[0050] Specifically, if Figure 1 and Figure 6As shown, the surface of the second connection part 12 away from the first connection part 11, that is, the top surface of the second connection part 12 is provided with a connection protrusion 121, the connection protrusion 121 extends along the Z direction, and the connection protrusion 121 is columnar, and its cross-sectional shape includes but is not limited to a circle, an ellipse or a quadrilateral. When the top surface of the second connection part 12 is electrically connected to the pole 2, the connection protrusion 121 is embedded in the groove 21 of the pole 2, which not only has the function of fixing the connection terminal 1, but also the protrusion structure increases the welding area between the second connection part 12 and the pole 2 compared to the plane structure, thereby improving the flow capacity between the connection terminal 1 and the pole 2.

[0051] In the connection terminal provided by the embodiment of the utility model, the first connection part and the second connection part are integrally connected and formed, which reduces the resistance between the first connection part and the second connection part caused by the welding process, improves the current carrying capacity of the connection terminal, and at the same time increases the welding area between the first connection part and the pole ear, thereby improving the current carrying capacity between the connection terminal and the pole ear. In addition, when electrically connected to the pole, the connection protrusion is embedded in the pole, which not only enhances the fixing force of the pole for the connection terminal, but also increases the welding area, thereby improving the current carrying capacity between the connection terminal and the pole.

[0052] Optionally, refer to Figure 1 and Figure 6 The first surface and the second surface are distributed along a first direction, the height of the second connecting portion 12 parallel to the first direction is a, the length of the second connecting portion 12 perpendicular to the first direction is b, and b≥a.

[0053] Specifically, if Figure 1 and Figure 6As shown, the two surfaces of the first connection part 11 are distributed along the first direction Z direction. Along the Z direction, the height of the second connection part 12 is a. Along the direction perpendicular to the Z direction, the second connection part 12 has a length dimension and a width dimension, wherein the length is b, b≥a. Therefore, the second connection part 12 is flat in shape, and the specific size can be designed accordingly according to the power performance requirements of different battery cells. In the related art, the height of the second connection part 12 is greater than its length and is slender in shape. Compared with the related art, the second connection part 12 in the flat shape in this embodiment has an increased length b and an unchanged width c, so the cross-sectional area increases, thereby improving the flow capacity of the connection terminal. At the same time, the cross-sectional perimeter increases, while its height a decreases slightly, but the degree of change in the cross-sectional perimeter is greater than the degree of change in the height. Since the side area is the product of the cross-sectional perimeter and the height a, the side area increases, which is beneficial to the heat dissipation of the second connection part 12 and the connection terminal 1. During high-power charging and discharging, the temperature rise in the top cover area of ​​the battery cell is effectively controlled, and the uneven temperature rise of the battery cell is improved. In addition, compared with the related art, the second connection portion 12 of this embodiment has a lower height, which effectively reduces the size of the cell top cover area in the height direction, improves the space utilization of the cell packaging structure, and thus controls the overall quality of the cell top cover, which is beneficial to improving the specific energy of the cell. The height of the second connection portion 12 can be designed accordingly according to the power performance of the cell.

[0054] Optionally, refer to Figure 1 and Figure 6 At least two connecting protrusions 121 are provided on the surface of the second connecting portion 12 facing away from the first connecting portion 11 .

[0055] Specifically, if Figure 1 and Figure 6 As shown, the number of the connecting protrusions 121 is at least two, and two, three or more can be provided. In the embodiment of the utility model, two connecting protrusions 121 are provided, and the two connecting protrusions 121 are located on both sides of the top surface of the second connecting portion 12. Each connecting protrusion 121 is respectively embedded and fixed in a groove 21 of a pole 2, so that the force between the second connecting portion 12 and the pole 2 is evenly distributed, further improving the fixing force of the connecting terminal 1, increasing the welding area between the second connecting portion 12 and the pole 2, and improving the flow capacity between the connecting terminal 1 and the pole 2.

[0056] Optionally, refer to Figure 6 The connecting terminal 1 also includes an alloy connecting piece 13; the alloy connecting piece 13 is electrically connected to the surface of the second connecting portion 12 away from the first connecting portion 11, and a through hole is opened on the alloy connecting piece 13, and the connecting protrusion 121 passes through the through hole. The alloy connecting piece 13 is suitable for being electrically connected to the pole 2 at the negative end.

[0057] Specifically, if Figure 1 As shown, in this embodiment, the tab, cover plate 3 and pole 2 of the positive terminal of the battery cell are made of aluminum, so the first connection part 11 and the second connection part 12 of the positive terminal are made of aluminum; while the tab of the negative terminal of the battery cell is made of copper, the cover plate 3 and the pole 2 are made of aluminum, so the first connection part 11 and the second connection part 12 of the negative terminal are made of copper, and the alloy connecting piece 13 is arranged between the second connection part 12 and the pole 2 to improve the welding strength between the second connection part 12 and the pole 2, thereby improving the structural strength of the battery cell top cover and the battery as a whole. For example, the alloy connecting piece 13 is a copper-aluminum alloy connecting piece. A fifth through hole 131 is provided on the alloy connecting piece 13, and the connecting protrusion 121 is fixed in the fifth through hole 131 and electrically connected to the pole 2. The alloy connecting piece 13 is fixed between the second connection part 12 and the pole 2, and the upper surface of the alloy connecting piece 13 is welded to the pole 2, and the lower surface is welded to the second connection part 12.

[0058] The utility model embodiment also provides a cover plate assembly, referring to Figures 1 to 5 , including a cover plate 3, a pole 2 and the connecting terminal 1 described in any one of the above embodiments; the first connecting portion 11 is located on one side of the cover plate 3, the pole 2 is located on the other opposite side of the cover plate 3, and a first through hole 31 is opened on the cover plate 3; the second connecting portion 12 is passed through and fixed in the first through hole 31 and is electrically connected to the pole 2.

[0059] Specifically, if Figures 1 to 5 The structure of the positive electrode cover plate assembly is shown. Figures 6 to 10 The structure of the negative electrode cover plate assembly is shown. The positive electrode cover plate assembly is located at one end of the battery cell, and the negative electrode cover plate assembly is located at the other end of the battery cell. The cover plate assembly includes a cover plate 3, a pole 2 and a connecting terminal 1. The cover plate 3 plays a protective and supporting role for the battery cell, and this embodiment adopts an aluminum cover plate. The pole 2 is located on the upper side of the cover plate 3 and is used to be electrically connected to an external electrical device. The first connecting portion 11 is located on the lower side of the cover plate 3. The cover plate 3 is provided with a first through hole 31 along the thickness direction. The second connecting portion 12 is passed through the first through hole 31 and is electrically connected to the pole. The electrical connection structure composed of the connecting terminal 1 and the pole 2 constitutes a current path between the battery cell and the external electrical device. The cover plate assembly adopts the connecting terminal provided in this embodiment. Since the welding process between the first connecting portion 11 and the second connecting portion 12 is cancelled, and the welding area between the connecting terminal 1 and the pole ear is increased, the current carrying capacity of the cover plate assembly and the battery cell is improved.

[0060] Optionally, refer to Figure 3 , Figure 5 , Figure 8 and Fig.10 A groove 21 is provided on the surface of the pole 2 facing the cover plate 3 ; the connecting protrusion 121 is embedded in the groove 21 .

[0061] Specifically, the structure of the positive electrode cover plate assembly is as follows Figure 3 and Figure 5 As shown, the structure of the positive electrode cover plate assembly is as follows Figure 8 and Fig.10 As shown, a groove 21 is provided on the surface of the pole 2 facing the cover plate 3, that is, the lower surface of the pole 2, and the connecting protrusion 121 is embedded in the groove 21. Since the connecting terminal 1 and the pole 2 are connected by welding, a certain amount of solder can be collected at the groove 21 to prevent the solder from overflowing and affecting the welding between the connecting terminal 1 and the pole 2, and between the first insulating member 4 and the pole 2. At the same time, the structure of the connecting protrusion 121 matches that of the groove 21, which can fix the position of the connecting terminal 1 to prevent shaking. In addition, the welding area between the second connecting portion 12 and the pole 2 is increased, and the flow capacity of the cover assembly is improved.

[0062] Optionally, refer to Figures 1 to 5 The cover plate assembly further includes a first insulating member 4 ; the first insulating member 4 is connected between the pole 2 and the cover plate 3 to insulate and isolate the pole 2 from the cover plate 3 .

[0063] Specifically, if Figures 1 to 5 As shown, taking the positive electrode cover plate assembly as an example, the first insulating member 4 is connected between the pole 2 and the cover plate 3. The first insulating member 4 is brazed to the pole. The first insulating member 4 is annular, and a second through hole 41 is formed in the middle thereof. The size of the second through hole 41 is equal to or slightly larger than the cross-sectional size of the second connecting portion 12, so that the second connecting portion 12 is fixed in the second through hole 41 and electrically connected to the pole 2. The material of the first insulating member 4 includes but is not limited to ceramic, rubber, plastic or mica. The first insulating member 4 of this embodiment is an insulating ceramic ring. The first insulating member 4 can not only fix the second connecting portion 12, but also insulate and isolate the pole 2 from the cover plate 3, so as to avoid the cover plate 3 from contacting and short-circuiting with the charged pole 2, so that the cover plate 3 is charged and safety problems arise. The negative electrode cover plate assembly has the same function as the first insulating member 4 in the positive electrode cover plate assembly, which insulates and isolates the pole 2 at the negative end from the cover plate 3.

[0064] Optionally, refer to Figures 1 to 5 The cover plate assembly further includes a sealing member 5 ; the sealing member 5 is sealingly connected between the first insulating member 4 and the cover plate 3 .

[0065] Specifically, if Figures 1 to 5As shown, taking the positive electrode cover plate assembly as an example, the seal 5 is sealed and connected between the first insulating member 4 and the cover plate 3. The seal 5 is made of metal. In this embodiment, the seal 5 is an aluminum connecting ring. The seal 5 is brazed to the first insulating member 4, and the seal 5 is laser welded to the cover plate 3. It plays the role of sealing the top cover assembly and preventing leakage. A third through hole 51 is provided on the seal 5, and the second connecting portion 12 is penetrated in the third through hole 51. The negative electrode cover plate assembly has the same function as the seal 5 in the positive electrode cover plate assembly, which seals the negative electrode cover plate assembly to prevent leakage at the negative end.

[0066] Optionally, refer to Figures 1 to 5 A protrusion 22 is provided on the edge of the pole 2 ; the protrusion 22 is welded to the side of the first insulating member 4 facing the pole 2 .

[0067] Specifically, if Figures 1 to 5 As shown, from the lower surface toward the upper surface of the pole 2, the pole 2 has a trapezoidal structure, and a protrusion 22 is provided on its edge. The protrusion 22 provides a welding position to facilitate the brazing connection between the pole 2 and the first insulating member 4 facing the side of the pole 2 and the upper side of the first insulating member 4.

[0068] Optionally, refer to Figures 1 to 5 The cover plate assembly further includes a second insulating member 6 ; the second insulating member 6 is connected between the cover plate 3 and the first connecting portion 11 to insulate and isolate the cover plate 3 from the connecting terminal 1 .

[0069] Specifically, if Figures 1 to 5 As shown, the second insulating member 6 is made of PP (Polypropylene) rubber material, which has strong insulation properties, and insulates and isolates the cover plate 3 and the connecting terminal 1 to prevent the connecting terminal 1 from contacting and conducting with the cover plate 3, so that the cover plate 3 is charged and a safety problem occurs. A fourth through hole 61 is provided on the second insulating member 6, and the second connecting portion 12 is penetrated and fixed in the fourth through hole 61, and is sequentially penetrated through the first through hole 31 on the cover plate 3, the third through hole 51 of the sealing member 5 and the second through hole 41 of the first insulating member 4, and is electrically connected to the pole 2. Therefore, the second insulating member 6 also has the function of fixing the second connecting portion 12. Among them, the opening position and size of the fourth through hole 61, the first through hole 31, the third through hole 51 and the second through hole 41 are determined according to the position and size of the second connecting portion 12.

[0070] Specifically, if Figure 1 As shown, the cover plate 3 of the positive terminal is provided with a liquid injection hole 32, and the cover plate assembly of the positive terminal further includes a liquid injection hole sealing cover 71, a sealing pin 72 and a sealing ring 73. The sealing pin 72 cooperates with the liquid injection hole sealing cover 71 and the sealing ring 73 to form a sealing effect to prevent leakage of electrolyte.

[0071] Specifically, if Figure 6 As shown, the cover plate assembly at the negative terminal also includes a pressure relief valve 8, which is used to ensure the safety of battery operation. During the use of the battery, due to various reasons, such as overcharging, over-discharging, short circuit, etc., excessive gas may be generated inside the battery. The pressure relief valve 8 controls the pressure of the gas inside the battery through its own pressure control device to keep it within a safe range, thereby preventing the battery from exploding, catching fire, and other accidents due to excessive expansion.

[0072] An embodiment of the utility model further provides a battery, comprising a battery cell and the cover plate assembly described in any one of the above embodiments; the electrode tab of the battery cell is electrically connected to the first surface of the first connecting portion 11 .

[0073] The cover assembly provided in the embodiment of the utility model can improve the flow capacity between the battery cell and the connection terminal, thereby improving the flow capacity of the entire battery to meet the performance requirements of high specific energy, high specific power, fast charging and deep discharge.

[0074] An embodiment of the utility model further provides an electric device, comprising the battery described in one of the above embodiments, wherein the electric device includes but is not limited to an electric car or a battery replacement station.

[0075] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0076] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A connecting terminal, characterized in that: The connecting terminal (1) comprises a first connecting portion (11) and a second connecting portion (12); The first surface of the first connecting portion (11) is suitable for electrically connecting to a tab, the second surface of the first connecting portion (11) is integrally connected with a second connecting portion (12), the second connecting portion (12) protrudes from the second surface, and the first surface and the second surface are opposite to each other; The surface of the second connecting portion (12) facing away from the first connecting portion (11) is suitable for being electrically connected to the pole (2), and the surface of the second connecting portion (12) facing away from the first connecting portion (11) is provided with a connecting protrusion (121), and the connecting protrusion (121) is suitable for being embedded in the pole (2).

2. The connecting terminal according to claim 1, characterized in that: The first surface and the second surface are distributed along a first direction, the height of the second connecting portion (12) parallel to the first direction is a, the length of the second connecting portion (12) perpendicular to the first direction is b, and b≥a.

3. The connecting terminal according to claim 1, characterized in that: At least two connecting protrusions (121) are provided on a surface of the second connecting portion (12) facing away from the first connecting portion (11).

4. The connecting terminal according to claim 1, characterized in that: The connecting terminal (1) further comprises an alloy connecting piece (13); The alloy connecting piece (13) is electrically connected to the surface of the second connecting portion (12) facing away from the first connecting portion (11), a through hole is provided on the alloy connecting piece (13), the connecting protrusion (121) passes through the through hole, and the alloy connecting piece (13) is suitable for being electrically connected to the pole (2) at the negative terminal.

5. A cover plate assembly, characterized in that: It comprises a cover plate (3), a pole (2) and a connecting terminal (1) according to any one of claims 1 to 4; The first connection portion (11) is located on one side of the cover plate (3), the pole (2) is located on the other opposite side of the cover plate (3), and a first through hole (31) is provided on the cover plate (3); The second connecting portion (12) is inserted into and fixed in the first through hole (31) and is electrically connected to the pole (2).

6. The cover plate assembly according to claim 5, characterized in that: A groove (21) is provided on the surface of the pole (2) facing the cover plate (3); The connecting protrusion (121) is embedded in the groove (21).

7. The cover plate assembly according to claim 5, characterized in that: The cover plate assembly also includes a first insulating member (4); The first insulating member (4) is connected between the pole (2) and the cover plate (3) to insulate and isolate the pole (2) from the cover plate (3).

8. The cover plate assembly according to claim 7, characterized in that: The cover plate assembly also includes a sealing member (5); The sealing member (5) is sealingly connected between the first insulating member (4) and the cover plate (3).

9. The cover plate assembly according to claim 7, characterized in that: The edge of the pole (2) is provided with a protrusion (22); The protruding portion (22) is welded to a side of the first insulating member (4) facing the pole (2).

10. The cover plate assembly according to claim 5, characterized in that: The cover plate assembly also includes a second insulating member (6); The second insulating member (6) is connected between the cover plate (3) and the first connecting portion (11) to insulate and isolate the cover plate (3) from the connecting terminal (1).

11. A battery, characterized in that: Comprising a battery cell and a cover plate assembly according to any one of claims 5 to 10; The tab of the battery cell is electrically connected to the first surface of the first connecting portion (11).

12. An electrical device, characterized in that: Comprising the battery of claim 11.

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