Battery cover plate, battery, battery pack and electric equipment

Abstract

The embodiment of the utility model discloses a battery cover plate, a battery, a battery pack and electric equipment, and belongs to the technical field of batteries, the battery cover plate is used for being mounted on a battery shell of the battery, the battery cover plate comprises a cover plate body, the cover plate body is a conductive part, the cover plate body is provided with a connecting structure, and the connecting structure is used for connecting the cover plate body and a tab of the battery; wherein the current-carrying area of the connecting structure is not smaller than the ratio of the overcurrent value of the connecting structure to the current-carrying coefficient of the connecting structure. The current-carrying area corresponding to the cover plate body can be reasonably designed according to the current values of different batteries, and then the cover plate body suitable for different current values is designed, so that conductive materials for manufacturing the cover plate body can be saved on the premise that the conductive performance of the cover plate body is met, and the cost is reduced. And therefore, the manufacturing cost of the cover plate body can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery cover plate, a battery, a battery pack, and an electrical device. Background Art

[0002] With the popularization of the new energy industry, power batteries (including lithium-ion batteries and sodium-ion batteries), as an energy device, have been widely used in fields such as vehicles.

[0003] A battery includes a battery housing and a battery cover plate covering the battery housing. A battery cell is accommodated in the battery housing. The battery cover plate generally includes a cover plate body, a positive electrode post, a negative electrode post, an upper plastic sheet, a lower plastic sheet, etc. The positive electrode post is connected to the positive electrode tab on the battery cell, and the negative electrode post is connected to the negative electrode tab on the battery cell. The current of the battery is led out through the positive electrode post and the negative electrode post respectively.

[0004] However, the current-carrying area of the above-mentioned battery cover plate is fixed, and the over-current value is fixed, and it cannot be reasonably changed according to the current values of different batteries. Summary of the Utility Model

[0005] In view of the above problems, the present application provides a battery cover plate, a battery, a battery pack, and an electrical device, which can reasonably design the current-carrying area corresponding to the cover plate body according to the current values of different batteries, and then design a cover plate body suitable for different current values, thereby helping to save the conductive material used to make the cover plate body on the premise of meeting the conductive performance of the cover plate body, and further helping to reduce the manufacturing cost of the cover plate body.

[0006] To achieve the above object, the present application provides the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a battery cover plate for being installed on a battery housing of a battery. The battery cover plate includes: a cover plate body, the cover plate body being a conductive member, and the cover plate body having a connection structure for connecting the cover plate body and a tab of the battery; wherein, the current-carrying area S of the connection structure is not less than the ratio of the maximum over-current value I borne by the connection structure to the current-carrying coefficient N of the connection structure; wherein, I is the continuous current that the corresponding battery needs to meet, with the unit of A; N is the current-carrying coefficient of the corresponding battery cover plate, with the unit of A / mm 2 ; S is the minimum cross-sectional end face of the corresponding battery cover plate, with the unit of mm 2 .

[0008] In an implementable embodiment, the cover plate body is a metal single-piece or a metal composite piece.

[0009] In an implementable embodiment, the current-carrying coefficient N of the connection structure is between 3 - 8 A / mm 2 .

[0010] In an implementable embodiment, when the cover body is a metal single-piece, the current-carrying coefficient of the connection structure is between 3 - 8 A / mm 2 ; when the cover body is a metal composite, the current-carrying coefficient of the connection structure is between 4 - 7 A / mm 2 .

[0011] In an implementable embodiment, when the cover body is a copper cover piece, the current-carrying coefficient N1 of the connection structure is between 5 - 8 A / mm 2 ; or, when the cover body is an aluminum cover piece, the current-carrying coefficient N2 of the connection structure is between 3 - 5 A / mm 2 ; or, when the cover body is a copper-aluminum composite, the current-carrying coefficient N3 of the connection structure is between 4 - 7 A / mm 2 .

[0012] In an implementable embodiment, it further includes an insulating ring, and the insulating ring is welded to the cover body.

[0013] In an implementable embodiment, there is a welding surface between the cover body and the tab of the battery, and the welding area of the welding surface is the current-carrying area of the connection structure; the welding surface is used to connect the cover body and the tab of the battery.

[0014] In an implementable embodiment, the welding surface has a minimum contour line and a maximum contour line; the spacing range between the minimum contour line and the maximum contour line is between 0 - 3 mm.

[0015] In an implementable embodiment, the cover body includes a first part and a second part. The first part is connected to the side plate surface of the second part facing away from the insulating ring. An installation part is provided on the insulating ring, the second part is installed on the installation part, and the first part abuts against the surface of the insulating ring.

[0016] In an implementable embodiment, an installation through-hole is opened on the insulating ring, and the installation through-hole forms the installation part. Part of the second part is installed in the installation through-hole; the first part is located on the side of the insulating ring close to the battery housing or on the side away from the battery housing.

[0017] In an implementable embodiment, it further includes a connecting ring, and the connecting ring is used to connect the insulating ring and the battery housing.

[0018] The second aspect of the embodiments of the present application provides a battery, including a battery housing and a battery cover; the battery cover is installed on the battery housing.

[0019] In an implementable embodiment, it further includes an electrode core, the electrode core is located in the battery housing, and tab ears are arranged on the electrode core.

[0020] The third aspect of the embodiments of the present application provides a battery pack, and the battery pack includes a battery.

[0021] The fourth aspect of the embodiments of the present application provides an electrical device, and the electrical device includes a battery pack.

[0022] The embodiments of the present application provide a battery cover plate, a battery, a battery pack and an electrical device. The battery cover plate includes a cover plate body, the cover plate body is a conductive member, and the cover plate body has a connection structure, and the connection structure is used to connect the cover plate body and the tab ear of the battery. In this way, the connection structure serves as a pole column for current transmission, and its cross-sectional area is larger than that of the pole column, which can effectively shorten the current transmission path and improve the over-current capacity of the battery. The current-carrying area of the connection structure is not less than the ratio between the maximum over-current value borne by the connection structure and the current-carrying coefficient of the connection structure. In this way, on the one hand, it helps to avoid the problem that if the current value of the battery is too large and the current-carrying area of the cover plate body is too small, resulting in the over-current value of the cover plate body being less than the current value of the battery and unable to carry all the current of the battery, thereby avoiding the problem that the power supply capacity of the battery to the electrical device is poor due to the inability to fully draw out all the current of the battery; on the other hand, it helps to avoid the problem that if the current value of the battery is too small and the current-carrying area of the cover plate body is too large, resulting in the over-current value of the cover plate body being greater than the current value of the battery and causing waste of the non-over-current cover plate body, thereby avoiding the problem of wasting the conductive material for making the cover plate body and increasing the manufacturing cost of the cover plate body. Therefore, the present application can reasonably design the corresponding current-carrying area of the cover plate body according to the current values of different batteries, and then design a cover plate body suitable for different current values, which helps to save the conductive material for making the cover plate body on the premise of meeting the conductive performance of the cover plate body, and further helps to reduce the manufacturing cost of the cover plate body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the first battery cover plate provided by the embodiments of the present application;

[0024] Figure 2 It is a top view of the first battery cover plate provided by the embodiments of the present application;

[0025] Figure 3 It is a sectional view of the first battery cover plate provided by the embodiments of the present application along the A-A direction;

[0026] Figure 4 It is a schematic structural diagram of the second battery cover plate provided by the embodiments of the present application;

[0027] Figure 5 The top view of the second battery cover plate provided by the embodiment of the present application;

[0028] Figure 6 The sectional view of the second battery cover plate provided by the embodiment of the present application along the B-B direction;

[0029] Figure 7 The side view of the battery cover plate provided by the embodiment of the present application;

[0030] Figure 8 The structural schematic diagram of the connection structure and the welding surface of the battery cover plate provided by the embodiment of the present application;

[0031] Figure 9 The structural schematic diagram of the welding surface of the battery cover plate provided by the embodiment of the present application having a maximum contour line and a minimum contour line.

[0032] Explanation of reference numerals:

[0033] 100 - Battery cover plate;

[0034] 110 - Cover plate body; 111 - First part; 112 - Second part;

[0035] 120 - Connection structure; 130 - Insulating ring; 131 - Installation part;

[0036] 132 Installation table; 140 - Welding surface; 141 - Minimum contour line;

[0037] 142 - Maximum contour line; 150 - Connection ring. Detailed implementation manners

[0038] The battery includes a battery housing and a battery cover plate covering the battery housing, and an electric core is accommodated in the battery housing. In the related art, the battery cover plate generally includes a cover plate body, a positive electrode post, a negative electrode post, an upper plastic sheet, a lower plastic sheet, etc. The positive electrode post is connected to the positive electrode tab on the electric core, and the negative electrode post is connected to the negative electrode tab on the electric core. The current of the battery is led out through the positive electrode post and the negative electrode post respectively.

[0039] Among them, the cross-sectional area of the electrode post determines the current-carrying capacity allowed by the battery cover plate. In the related art, due to the too small current-carrying area of the electrode post, and at the same time due to the limitation in the width direction of the battery, the electrode post cannot be made too large, resulting in the limitation of the current-carrying capacity of the battery cover plate. In addition, in the related art, for different batteries, the current-carrying areas of the negative electrode post and the positive electrode post are generally designed to be fixed and unchanged, so that the over-current values of the negative electrode post and the positive electrode post are fixed and unchanged, and cannot be reasonably changed according to different current values of the battery, and cannot better meet the conductive performance of the positive electrode post and the negative electrode post, resulting in waste of conductive materials and relatively high manufacturing cost of the battery cover plate.

[0040] In view of the above technical problems, embodiments of the present application provide a battery cover plate, a battery, a battery pack, and an electrical device. It is possible to reasonably design the current-carrying area corresponding to the cover plate body according to the current values of different batteries, and then design a cover plate body suitable for different current values, which helps to save the conductive material used to make the cover plate body on the premise of meeting the conductive performance of the cover plate body, and further helps to reduce the manufacturing cost of the cover plate body.

[0041] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar components or components with the same or similar functions from beginning to end. The described embodiments are some but not all of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, but should not be construed as a limitation to the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0042] Refer to Figures 1 to 6 As shown, embodiments of the present application provide a battery cover plate 100 for being installed on a battery housing of a battery. The battery cover plate 100 may include a cover plate body 110. The cover plate body 110 is a conductive member, and the cover plate body 110 has a connection structure 120. The connection structure 120 is used to connect the cover plate body 110 and the ear of the battery.

[0043] In embodiments of the present application, the conductive material of the cover plate body 110 is not limited. Exemplarily, the material of the cover plate body 110 may be a metallic element, a metal alloy, or a conductive non-metallic material, such as pure copper, aluminum-copper composite, steel-aluminum composite, etc. This embodiment is not limited thereto.

[0044] It should be noted that the connection structure 120 is a partial structure of the cover plate body 110 itself and is not a separately provided structure. Therefore, it can be understood that the connection structure 120 and the cover plate body 110 are made of the same material, that is, the connection structure 120 is also a conductive member. The connection structure 120 connects the cover plate body 110 and the ear of the battery, which helps to realize the transmission of the current of the battery.

[0045] It should be noted that the transmission of the current of the battery may include: transmitting the current from the battery to the outside, such as transmitting it to an electrical device, and the battery supplies power to the electrical device; or transmitting the current from the outside, such as a charging pile, to the battery, and the charging pile charges the battery. This embodiment is not limited thereto.

[0046] In the embodiment of the present application, the connection structure 120 is directly connected to the cover plate body 110 and the ear of the battery. In this way, compared with the related art in which a pole is provided on the battery cover plate 100 and the ear is connected through the pole to realize the transmission of the current of the battery, in the present application, the pole is replaced by the cover plate body 110, and the current is transmitted through the connection structure 120 on the cover plate body 110. Among them, since the cross-sectional area of the cover plate body 110 is larger than that of the pole and the length is smaller than that of the pole, its resistance is smaller, so that the path of current transmission can be effectively shortened, and the over-current capacity of the battery can be improved.

[0047] In addition, in the embodiment of the present application, taking the cover plate body 110 as the pole, compared with the structure of the battery cover plate 100 in the related art, the present application can omit components such as poles, lower plastic sheets and upper plastic sheets. The battery cover plate 100 of the present application has fewer components, which helps to avoid the problem of the failure of the battery cover plate 100 caused by the failure of the components, improves the reliability of the battery cover plate 100, and helps to simplify the manufacturing process of the battery cover plate 100.

[0048] In order to further design the cover plate body 110 applicable to different current values on the premise of meeting the conductive performance of the cover plate body 110. In the embodiment of the present application, the current-carrying area S of the connection structure 120 is not less than the ratio between the maximum over-current value I of the connection structure 120 and the current-carrying coefficient N of the connection structure 120.

[0049] Wherein, I is the continuous current that the corresponding battery needs to meet, and the unit is A; N is the current-carrying coefficient of the corresponding battery cover plate, and the unit is A / mm 2 ; S is the minimum cross-sectional end face of the corresponding battery cover plate, and the unit is mm 2 .

[0050] In the embodiment of the present application, the maximum over-current value of the connection structure 120 is: the maximum current value of the battery when it needs to meet the continuous charge and discharge time greater than or equal to the preset time, and the unit is A. Among them, the preset time is not limited and can be specifically set according to actual needs. That is, the maximum over-current value is the continuous current that the corresponding battery needs to meet. It should be noted that when designing the battery, the maximum over-current value is determined by the corresponding battery. Different batteries will introduce corresponding matching maximum over-current values during design. That is to say, the maximum over-current value of the battery is not a fixed value, but is comprehensively determined by various factors such as the type, specification, use conditions and safety factors of the battery, and is determined during the design and testing process of the battery.

[0051] For example, for a 50A battery that meets the 4C requirement, the maximum overcurrent value of the battery is I = 200A. Here, C refers to the charge-discharge rate of the battery. In the embodiments of the present application, the current-carrying coefficient of the connection structure 120 is: the maximum current that the cover body 110 per unit area can carry, with the unit of A / mm 2 . Among them, the current-carrying coefficients of the cover bodies 110 made of different materials are different.

[0052] The ratio between the maximum overcurrent value of the connection structure 120 and the current-carrying coefficient of the connection structure 120 gives the current-carrying area of the connection structure 120. The unit of the current-carrying area is mm 2 . Among them, for the maximum overcurrent values of different batteries, different current-carrying areas can be obtained.

[0053] With such a design, on the one hand, it helps to avoid the problem that if the current value of the battery is too large and the current-carrying area of the cover body 110 is too small, resulting in the inability to carry all the current of the battery because the overcurrent value of the cover body 110 is less than the current value of the battery, thus avoiding the problem that the power supply ability of the battery to the electrical equipment is poor due to the inability to fully draw out the current of the battery; on the other hand, it helps to avoid the problem that if the current value of the battery is too small and the current-carrying area of the cover body 110 is too large, resulting in waste of the cover body 110 that has not experienced overcurrent because the overcurrent value of the cover body 110 is greater than the current value of the battery, thus avoiding waste of the conductive material for making the cover body 110 and reducing the manufacturing cost of the cover body 110.

[0054] Therefore, the battery cover 100 provided by the embodiments of the present application can reasonably design the corresponding current-carrying area of the cover body 110 according to the current values of different batteries, and then design the cover body 110 suitable for different current values, which helps to save the conductive material for making the cover body 110 on the premise of meeting the conductive performance of the cover body 110, and further helps to reduce the manufacturing cost of the cover body 110.

[0055] In an implementable embodiment, the cover body 110 can be a metal single-piece.

[0056] It should be noted that the metal single-piece means that the cover body 110 is made of the same metal material. In this embodiment, the specific material of the cover body 110 is not limited. For example, the material of the cover body 110 can be pure copper, pure aluminum, etc. As long as it has conductive performance and connects the cover body 110 and the battery tab, it belongs to the protection scope of the present application.

[0057] In an implementable embodiment, the cover body 110 can be a copper cover piece, that is, the cover body 110 is made of copper material, and the current-carrying coefficient N1 of the connection structure 120 is between 5 - 8A / mm 2Exemplarily, the current-carrying coefficient N1 of the connection structure 120 can be 5 A / mm 2 , 6 A / mm 2 , 7 A / mm 2 , 8 A / mm 2 or any value between 5 - 8 A / mm 2 .

[0058] In the embodiments of the present application, mainly taking the current-carrying coefficient N1 of the copper cover plate member as 5 as an example for illustration. For example, for a 50 A battery that meets the 4C requirement, the maximum current value of the battery is I1 = 200 A. When the cover plate body 110 uses a copper cover plate, the current-carrying area S1 of the copper cover plate ≥ 200 / 5 = 40 mm 2 .

[0059] In an implementable embodiment, the cover plate body 110 can be an aluminum cover plate member, that is, the cover plate body 110 is made of aluminum material, and the current-carrying coefficient N2 of the connection structure 120 is between 3 - 5 A / mm 2 Exemplarily, the current-carrying coefficient N2 of the connection structure 120 can be 3 A / mm 2 , 3.5 A / mm 2 , 4 A / mm 2 , 5 A / mm 2 or any value between 3 - 5 A / mm 2 .

[0060] In the embodiments of the present application, mainly taking the current-carrying coefficient N2 of the aluminum cover plate member as 3 as an example for illustration. For example, for a 50 A battery that meets the 4C requirement, the maximum current value of the battery is I2 = 200 A. When the cover plate body 110 uses an aluminum cover plate, the current-carrying area S2 of the aluminum cover plate ≥ 200 / 3 = 67 mm 2 .

[0061] In an implementable embodiment, the cover plate body 110 can be a metal composite member.

[0062] It should be noted that metal composite means that the cover plate body 110 is made by compounding different metals. In this embodiment, the specific composite material of the cover plate body 110 is not limited. For example, the material of the cover plate body 110 can be copper-aluminum composite or steel-aluminum composite, and this embodiment does not make a limitation. As long as it has electrical conductivity and connects the cover plate body 110 and the battery tab, it belongs to the protection scope of the present application.

[0063] In an implementable embodiment, the cover plate body 110 can be a copper-aluminum composite member, that is, the cover plate body 110 is made of copper-aluminum composite material, and the current-carrying coefficient N3 of the connection structure 120 is between 4 - 7 A / mm 2. Exemplarily, the current-carrying coefficient N3 of the connection structure 120 can be 4 A / mm 2 , 5 A / mm 2 , 6 A / mm 2 , 7 A / mm 2 or any value between 4 - 7 A / mm 2 .

[0064] In the embodiments of the present application, mainly taking the current-carrying coefficient N3 of the copper-aluminum composite part as 4 as an example for illustration. For example, for a 50 A battery that meets the 4C requirement, the maximum current value of the battery is I3 = 200 A. When the cover body 110 adopts a copper-aluminum composite cover, the current-carrying area S3 of the copper-aluminum composite cover ≥ 200 / 4 = 50 mm 2 .

[0065] In an implementable embodiment, as shown in Figures 1 to 6 , the battery cover 100 may include an insulating ring 130, and the insulating ring 130 is connected to the cover body 110 by welding.

[0066] In this embodiment, the insulating ring 130 is disposed around the outer periphery of the cover body 110. It should be noted that the connection manner between the insulating ring 130 and the cover body 110 includes but is not limited to welding. For example, the connection manner between the insulating ring 130 and the cover body 110 can also be realized by hot melting, glue bonding, etc. Welding can be brazing.

[0067] In the embodiments of the present application, the material of the insulating ring 130 is not limited. Exemplarily, the material of the insulating ring 130 can be insulating materials or weakly conductive materials such as plastic materials, ceramic materials, tempered glass materials, etc. This is not limited in this embodiment, and the material can be specifically selected according to actual needs.

[0068] By providing the insulating ring 130, the insulating ring 130, as a sealing material, is generally used between the positive and negative electrodes of the battery. It helps to isolate conductive materials, prevent short circuits and leakage between the positive and negative electrodes of the battery, and thus helps to extend the service life of the battery.

[0069] In the embodiments of the present application, as shown in Figure 8 and Figure 9 , there may be a welding surface 140 between the cover body 110 and the pole ear of the battery. The welding area of the welding surface 140 is the current-carrying area of the connection structure 120; the welding surface 140 is used to connect the cover body 110 and the pole ear of the battery.

[0070] It should be noted that the welding surface 140 can be referred to as shown in the shaded area in Figure 8 . It can be understood that the welding surface 140 is a complete plane with a complete welding contour line, and the welding contour line isFigure 8 The edge lines of the shaded area in

[0071] Among them, since the welding surface 140 has a specific shape, the welding area of the welding surface 140 can be calculated according to the formula, so the current-carrying area of the connection structure 120 can be obtained. Exemplarily, if the welding surface 140 is a regular rectangular shape, the rectangular area calculation formula can be used for calculation; or, if the welding surface 140 is a regular circular shape, the circular area calculation formula can be used for calculation. This embodiment does not make any limitations in this regard.

[0072] Furthermore, since welding tolerances are likely to occur during the welding process, in the embodiments of the present application, the welding surface 140 may have a minimum contour line 141 and a maximum contour line 142. It should be noted that the maximum contour line 142 is the outermost contour line of the ring width, and the minimum contour line 141 is the innermost contour line of the ring width. In this way, it can effectively prevent the problem that the solder joints do not fall within the area range of the welding surface 140 due to displacement deviation during welding, thereby ensuring the welding tightness and welding strength between the insulating ring 130 and the cover body 110, and ensuring the effective connection and current-carrying of the cover body 110.

[0073] In the embodiments of the present application, the spacing range between the minimum contour line 141 and the maximum contour line 142 can be between 0 - 3 mm.

[0074] Exemplarily, referring to Figure 9 as shown, along the width direction of the cover body 110, the spacing X between the minimum contour line 141 and the maximum contour line 142 can be set to 0 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or any value between 0 - 3 mm according to actual needs. In this embodiment, the spacing X is mainly taken as 1 mm for illustration.

[0075] Exemplarily, referring to Figure 9 as shown, along the length direction of the cover body 110, the spacing Y between the minimum contour line 141 and the maximum contour line 142 can be set to 0 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or any value between 0 - 3 mm according to actual needs. In this embodiment, the spacing Y is mainly taken as 1 mm for illustration.

[0076] In an implementable embodiment, referring to Figure 1 、 Figure 4 and Figure 7As shown, the cover body 110 may include a first part 111 and a second part 112. The first part 111 is connected to one side plate surface of the second part 112 facing away from the insulating ring 130. An installation part 131 is provided on the insulating ring 130, and the second part 112 is installed on the installation part 131, and the first part 111 abuts against the surface of the insulating ring 130.

[0077] In the embodiment of the present application, the connection manner between the first part 111 and the second part 112 is not limited. Exemplarily, the first part 111 and the second part 112 may be an integral structure, or may be formed by multiple processing and assembly. In this embodiment, the first part 111 and the second part 112 being an integral structure is mainly taken as an example for description, which helps to improve the structural strength of the cover body 110.

[0078] In a feasible implementation manner, referring to Figure 1 and Figure 4 As shown, an installation through hole may be opened on the insulating ring 130, and the installation through hole forms the installation part 131, and a part of the second part 112 is installed in the installation through hole. In this way, it helps to improve the assembly strength and installation stability between the cover body 110 and the insulating ring 130.

[0079] In the embodiment of the present application, referring to Figure 4 As shown, the first part 111 may be located on the side of the insulating ring 130 close to the battery housing, and the cover body 110 is connected to the pole ear of the battery through the first part 111; or, in the embodiment of the present application, referring to Figure 1 As shown, the first part 111 may be located on the side away from the battery housing, and the cover body 110 is connected to the pole ear of the battery through the second part 112. This embodiment does not limit this.

[0080] Exemplarily, referring to Figure 1 As shown, when the first part 111 is located on the side away from the battery housing, an installation platform 132 may be provided on the insulating ring 130, and the installation platform 132 surrounds the outer periphery of the installation through hole, and the first part 111 abuts against the surface of the installation platform 132. In this way, it helps to further improve the assembly strength and installation stability between the cover body 110 and the insulating ring 130.

[0081] In a feasible implementation manner, referring to Figure 1 is Figure 6 As shown, a connection ring 150 may also be included, and the connection ring 150 is used to connect the insulating ring 130 and the battery housing. Exemplarily, the connecting piece may be a metal ring such as an aluminum ring.

[0082] In the embodiments of the present application, the function of setting the connecting ring 150 is as follows: Since the welding temperature of the insulating ring 130, such as the steel insulating ring 130, is relatively high, if the insulating ring 130 is directly welded to the battery housing, it is easy to affect the battery housing. The welding temperature of the connecting ring 150, such as an aluminum ring, is lower than that of the insulating ring 130. In this way, first, the insulating ring 130 and the connecting ring 150 are welded at a high temperature, and then the connecting ring 150 and the battery housing are welded at a low temperature, which helps to avoid the problem of affecting the battery housing.

[0083] In the embodiments of the present application, the thickness of the connecting ring 150 can be the same as the thickness of the edge of the battery housing. In this way, it can not only ensure the reliability of the connection of the battery housing, but also ensure the connection stability of the battery housing, and help to improve the sealing performance of the battery and avoid the problem of battery leakage.

[0084] The embodiments of the present application provide a battery and a battery pack. The battery pack includes a battery, and the number of batteries is not limited. Exemplarily, the number of batteries can be multiple, and multiple batteries are connected in series to form a battery pack; or, multiple batteries are connected in parallel to form a battery pack. This embodiment does not make a limitation on this.

[0085] Among them, the battery includes a battery housing, a battery cell, and a battery cover plate 100. The battery cover plate 100 is installed on the battery housing, the battery cell is located in the battery housing, and a tab is provided on the battery cell.

[0086] In the embodiments of the present application, the battery cell can be a lithium battery cell, a sodium battery cell, or an energy storage battery cell. The battery housing can be an aluminum shell housing. This embodiment does not make a limitation on this.

[0087] In the embodiments of the present application, the tab includes a positive tab and a negative tab. The positive tab and the negative tab are respectively connected to opposite sides of the battery cell. The battery cover plate 100 includes a positive cover plate and a negative cover plate. The positive cover plate and the negative cover plate are installed on opposite sides of the battery housing.

[0088] The positive cover plate and the negative cover plate respectively have a connection structure 120. Among them, the positive cover plate is welded and connected to the positive tab through the connection structure 120, and the negative cover plate is welded and connected to the negative tab through the connection structure 120. In this way, it helps to conduct electricity between the battery cell and the battery cover plate 100 to form a battery.

[0089] The embodiments of the present application provide an electrical device, and the battery is used to provide electrical energy for the electrical device.

[0090] The electrical device in the embodiments of the present application can be a vehicle. For example: the vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Correspondingly, the electrical device can be a driving mechanism of the vehicle or a control system of the vehicle.

[0091] In addition, the electrical device may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, power tools, ships, and spacecrafts, etc. Among them, the spacecraft may include airplanes, rockets, space shuttles, or spaceships.

[0092] Since the electrical device in this embodiment includes the battery described in any of the above embodiments, the structure and beneficial effects of the electrical device including the battery will not be elaborated herein again.

[0093] Therefore, the embodiments of the present application provide a battery cover plate, a battery, a battery pack, and an electrical device, which can reasonably design the current-carrying area corresponding to the cover plate body according to the current values of different batteries, and then design a cover plate body suitable for different current values, thereby helping to save the conductive material for making the cover plate body on the premise of meeting the conductive performance of the cover plate body, and further helping to reduce the manufacturing cost of the cover plate body.

[0094] It should be noted that in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the internal connection or interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0095] In the description of the embodiments of the present application, the term "and / or" only represents an association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" represents any one or any combination of at least two of a plurality. For example, including at least one of A and B can represent any one or more elements selected from the set including A, B, and C.

[0096] In the description of the embodiments of the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the meaning of the term "plurality" is two or more, unless otherwise specifically and precisely defined.

[0097] In the description of the embodiments of the present application, the terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover plate, characterized in that, For installation on the battery housing of a battery, the battery cover plate includes: A cover plate body (110), the cover plate body (110) being an electrically conductive member, the cover plate body (110) having a connection structure (120) for connecting the cover plate body (110) and the electrode tab of the battery; Wherein, the current-carrying area S of the connection structure (120) is not less than the ratio between the maximum over-current value I of the connection structure (120) and the current-carrying coefficient N of the connection structure (120); Wherein, I is the continuous current that the corresponding battery needs to meet, with the unit of A; N is the current-carrying coefficient of the corresponding battery cover plate, with the unit of A / mm 2 ; S is the minimum cross-sectional end face of the corresponding battery cover plate, with the unit of mm 2 .

2. The battery cover plate according to claim 1, wherein, The cover plate body (110) is a single-piece metal member or a composite metal member.

3. The battery cover plate according to claim 2, wherein, The current-carrying coefficient N of the connection structure (120) is between 3 - 8 A / mm 2 .

4. The battery cover plate according to claim 3, characterized in that, When the cover plate body (110) is a metal single-piece, the current-carrying coefficient of the connection structure (120) is between 3 - 8 A / mm 2 ; When the cover plate body (110) is a metal composite part, the current-carrying coefficient of the connection structure (120) is between 4 and 7 A / mm 2 .

5. The battery cover plate according to claim 4, wherein, When the cover plate body (110) is a copper cover plate member, the current-carrying coefficient N1 of the connection structure (120) is between 5 and 8 A / mm 2 ; Or, when the cover plate body (110) is an aluminum cover plate member, the current-carrying coefficient N2 of the connection structure (120) is between 3 - 5 A / mm 2 ; Or, when the cover plate body (110) is a copper-aluminum composite part, the current-carrying coefficient N3 of the connection structure (120) is between 4 and 7 A / mm 2 .

6. The battery cover plate according to any one of claims 1-5, characterized in that, It further includes an insulating ring (130), and the insulating ring (130) is welded to the cover plate body (110).

7. The battery cover plate according to any one of claims 1-5, characterized in that, There is a welding surface (140) between the cover plate body (110) and the electrode tab of the battery, and the welding area of the welding surface (140) is the current-carrying area of the connection structure (120); the welding surface (140) is used to connect the cover plate body (110) and the electrode tab of the battery.

8. The battery cover plate according to claim 7, wherein The welding surface (140) has a minimum contour line (141) and a maximum contour line (142); the spacing range between the minimum contour line (141) and the maximum contour line (142) is between 0 - 3 mm.

9. The battery cover plate according to claim 6, characterized in that, The cover plate body (110) includes a first part (111) and a second part (112), the first part (111) is connected to the side plate surface of the second part (112) facing away from the insulating ring (130), an installation part (131) is provided on the insulating ring (130), the second part (112) is installed on the installation part (131), and the first part (111) abuts against the surface of the insulating ring (130).

10. The battery cover plate according to claim 9, characterized in that, An installation through-hole is provided on the insulating ring (130), the installation through-hole forms the installation part (131), and a part of the second part (112) is installed in the installation through-hole; The first part (111) is located on the side of the insulating ring (130) close to the battery housing or on the side away from the battery housing.

11. The battery cover plate according to claim 6, wherein It further includes a connection ring (150) for connecting the insulating ring (130) and the battery housing.

12. A battery, characterized in that, It includes a battery housing and the battery cover plate according to any one of claims 1 - 11; the battery cover plate is installed on the battery housing.

13. The battery according to claim 12, characterized in that, It further includes an electric core, the electric core is located in the battery housing, and electrode tabs are provided on the electric core.

14. A battery pack, characterized in that, The battery pack includes the battery according to claim 12.

15. An electrical device, characterized in that, The electrical device includes the battery pack according to claim 14.

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