Battery, battery device and electric equipment

Abstract

The utility model discloses a battery, a battery device and electric equipment, the battery comprises a collector plate, an electrode leading-out terminal and a tab, the collector plate comprises a bending part and a connecting part, one end of the bending part is connected with the connecting part, the other end of the bending part is connected with the electrode leading-out terminal, the connecting part is welded with the tab to form a tab welding mark, and the tab welding mark is welded with the electrode leading-out terminal. The tab welding mark comprises a first welding mark, a bending line is arranged between the bending part and the connecting part, the first welding mark is positioned at one end, close to the bending part, of the connecting part, and an acute angle is formed between the extension direction of the first welding mark and the extension direction of the bending line. According to the scheme, the welding marks can be prevented from being pulled when the bending part and the connecting part of the current collecting plate are bent, it is guaranteed that the connecting part of the main body cannot be stressed and deformed when the current collecting plate is folded through the bending part, the acute angle is formed between the extending direction of the first welding mark and the extending direction of the bending line, the stress area during bending can be increased, and the bending quality of the current collecting plate is improved. And the connection reliability of the collector plate is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a battery, a battery device and electrical equipment. Background Art

[0002] With the continuous development of new energy technologies, lithium-ion batteries, as a new generation of batteries, have gradually been valued by people due to their green, environmentally friendly, and energy-efficient characteristics. Cylindrical lithium-ion batteries have been increasingly used in different fields, such as automobiles, due to their high safety, long life, and mature technology. Among them, the collector plate, as an important electronic component, is mainly used to lead the electrical energy of the battery core to the positive or negative terminal of the battery. In order to better achieve the electrical connection between the pole core and the cover plate, it is particularly important to study the collector plate of the battery.

[0003] At present, the current collector of cylindrical batteries in the related technology usually adopts a folding design structure. After one end of the current collector is welded to the pole ear, the other end of the current collector is bent. However, the current collector is easily deformed and pulled by the weld mark when folded, resulting in poor welding strength and low current carrying capacity, resulting in low reliability of the cylindrical battery. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a battery, a battery device and an electrical device.

[0005] In a first aspect, the utility model provides a battery, the method comprising:

[0006] A current collecting plate, an electrode lead terminal and a pole lug, wherein the current collecting plate comprises a bending portion and a connecting portion, one end of the bending portion is connected to the connecting portion, and the other end of the bending portion is connected to the electrode lead terminal, the connecting portion and the pole lug are welded to form a pole lug weld mark, and the pole lug weld mark comprises a first weld mark, a bending line is provided between the bending portion and the connecting portion, the first weld mark is located at one end of the connecting portion close to the bending portion, and an extension direction of the first weld mark is arranged at an acute angle to an extension direction of the bending line.

[0007] In one embodiment of the present application, an extension direction of the first weld mark is parallel to an extension direction of the bending line.

[0008] In one of the embodiments of the present application, the tab weld mark further includes a plurality of second weld marks, and the second weld marks are arranged on an area of ​​the connecting portion other than the first weld marks.

[0009] In one embodiment of the present application, the second weld mark is radially arranged from the center of the connecting portion to the edge of the connecting portion.

[0010] In one of the embodiments of the present application, the tab weld mark further includes at least one third weld mark, and the first weld mark is connected to the third weld mark.

[0011] In one embodiment of the present application, the first weld mark and the third weld mark are arranged vertically.

[0012] In one embodiment of the present application, the collecting plate further comprises:

[0013] An exhaust hole is located between two adjacent second weld marks.

[0014] In one of the embodiments of the present application, the exhaust holes are radially arranged from the center of the connecting portion to the edge of the connecting portion.

[0015] In one of the embodiments of the present application, the exhaust hole further includes: a center hole, which is located at the center of the connecting portion; the exhaust hole includes a first through hole and a second through hole, the first through hole is located between two adjacent second weld marks and is close to the center hole; the second through hole is located between two adjacent second weld marks and is far away from the center hole.

[0016] In one embodiment of the present application, the connecting portion and the exhaust hole satisfy the range: 3mm≤d1≤10mm, and / or, d2>2*D1, and / or, d1+2mm<d3<d4<d5<d1-2mm, and / or, 2mm≤d6≤10mm;

[0017] Among them, D1 is the width of the bending portion; d1 is the diameter of the center hole, d2 is the diameter of the connecting portion, d3 is the maximum distance between the center of the center hole and the first through hole, d4 is the minimum distance between the center of the center hole and the second through hole, d5 is the maximum distance between the center of the center hole and the second through hole, and d6 is the spacing between two adjacent second through holes.

[0018] In one of the embodiments of the present application, the bending portion includes at least two bending notches, and the at least two bending notches are arranged opposite to each other, and the bending line is formed between the two bending notches.

[0019] In one embodiment of the present application, the bending notch includes two oppositely arranged first bending notches and two oppositely arranged second bending notches, the first bending notch is arranged at an end away from the connecting part, and the second bending notch is arranged at an end close to the connecting part; the first bending line formed between the two first bending notches and the second bending line formed between the two second bending notches are parallel to each other and have the same length.

[0020] In one of the embodiments of the present application, the bending portion includes: a mounting area, on which a terminal connection area is provided, and the mounting area is connected to the electrode lead terminal through the terminal connection area.

[0021] In one embodiment of the present application, when the terminal connection area is annular, the terminal connection area satisfies the range: 0<d7<d8<D1, and / or the thickness of the collector plate satisfies the range: 0.15mm≤H≤0.5mm;

[0022] Wherein, D1 is the width of the bending portion, d7 is the diameter of the inner circle of the annular shape, d8 is the diameter of the outer circle of the annular shape, and H is the thickness range of the collecting plate.

[0023] In one embodiment of the present application, the bending portion and the mounting area satisfy the range: 10 mm ≤ D1 ≤ D2, and / or, 2*D2<D3, and / or, D3+5 mm<D4;

[0024] Among them, D1 is the width of the bending portion; D2 is the distance between one end of the installation area away from the connecting portion and the first bending line; D3 is the distance between one end of the installation area away from the connecting portion and the second bending line; D4 is the distance between one end of the installation area away from the connecting portion and the center of the center hole.

[0025] In one embodiment of the present application, the overflow value of the current collecting plate satisfies the range: C1≤C3≤C2;

[0026] Among them, C1 is the overcurrent value between the electrode tab and the current collecting disk, C2 is the overcurrent value between the current collecting disk and the electrode lead terminal, and C3 is the overcurrent value of the current conducted from the electrode tab to the electrode lead terminal.

[0027] In one of the embodiments of the present application, after the bending portion is bent along the first bending notch and the second bending notch, a distance d14 between the center of the terminal connection area and the center hole satisfies the range of 0≤d14≤0.3mm.

[0028] In a second aspect, an embodiment of the present application provides a battery device, including the battery provided in the first aspect above.

[0029] In a third aspect, an embodiment of the present application provides an electrical device, including a battery device as provided in the second aspect or a battery as provided in the first aspect.

[0030] The battery provided in the embodiment of the present application includes a current collecting plate, a battery lead terminal and a pole lug, the current collecting plate includes a bending portion and a connecting portion, one end of the bending portion is connected to the connecting portion, the other end of the bending portion is connected to the electrode lead terminal, the connecting portion and the pole lug are welded to form a pole lug weld mark, the pole lug weld mark includes a first weld mark, a bending line is provided between the bending portion and the connecting portion, the first weld mark is located at one end of the connecting portion close to the bending portion, and the extension direction of the first weld mark is arranged at an acute angle to the extension direction of the bending portion. Compared with the prior art, the battery provides more weldable sites on the current collecting disk because the connecting portion of the current collecting disk body is provided with a pole ear weld mark welded to the pole ear, thereby preventing the weld mark from being pulled when the bending portion of the current collecting disk and the connecting portion are bent, ensuring that the connecting portion of the main body will not be deformed by force when the current collecting disk is folded by the bending portion, and the extension direction of the first weld mark is set at an acute angle to the extension direction of the bending line, which can increase the force area during bending and improve the welding strength. At the same time, the connecting portion is connected to the pole ear through the pole ear weld mark, which can ensure the welding strength while also enhancing the current passing capacity. At the same time, the bending portion is connected to the electrode lead terminal, so that a complete conduction circuit is formed between the entire current collecting disk and the pole ear and the electrode lead terminal, greatly improving the connection reliability of the current collecting disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0032] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of the welding area of ​​the current collecting plate before folding provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the size setting structure of the current collecting plate provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of a pre-folded current collecting plate provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the structure of the current collecting plate after being bent provided in an embodiment of the present application;

[0037] Reference numerals:

[0038] Collecting plate-10; bending portion-11; connecting portion-12; center hole-13; exhaust hole-14; pole ear welding mark-120; first welding mark-121; second welding mark-122; third welding mark-123; first through hole-141; second through hole-142; installation area-111; terminal connection area-1110; first bending notch-1101; second bending notch-1102; first bending line-1103; second bending line-1104. DETAILED DESCRIPTION

[0039] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] It is understandable that with the increasing application of lithium-ion batteries in electric bicycles, electric vehicles and large energy storage power stations, higher and higher requirements are placed on the specifications, dimensions, technical performance and reliability of lithium-ion batteries. Among them, cylindrical lithium-ion batteries have attracted much attention due to their high capacity density, low cost and good safety performance. Among them, the collector plate plays the role of connecting devices in the circuit, and can transmit the signals of multiple devices to other devices to form a complex circuit to achieve the corresponding functions. At present, the relevant cylindrical power battery may include a collector plate, a connecting plate, an insulating plate, a sealing ring, a support member, etc., which are connected together by welding or riveting processes. The rapid current plate usually adopts a folding design structure. However, the collector plate is very easy to deform under stress when folded, which makes the welding strength poor and the current carrying capacity low, resulting in low reliability of the collector plate.

[0045] Based on the above-mentioned defects, the present application provides a battery, a battery device and an electrical equipment. Compared with the prior art, the battery provides more weldable sites on the current collecting disk because a pole ear weld mark for welding with the pole ear is provided on the connecting part of the current collecting disk body, thereby preventing the weld mark from being pulled when the bending part and the connecting part of the current collecting disk are bent, ensuring that the connecting part of the main body will not be deformed by force when the current collecting disk is folded by the bending part, and the extension direction of the first weld mark is set at an acute angle to the extension direction of the bending line, which can increase the force area during bending and improve the welding strength. At the same time, the connecting part is connected to the pole ear through the pole ear weld mark, which can ensure the welding strength while also enhancing the current passing capacity. At the same time, the bending part is connected to the electrode lead terminal, so that a complete conduction circuit is formed between the entire current collecting disk and the pole ear and the electrode lead terminal, greatly improving the connection reliability of the current collecting disk.

[0046] Reference below Figure 1-Figure 5 A battery, a battery device, and an electric device according to embodiments of the present application are described.

[0047] like Figure 1 As shown, Figure 1This is a schematic diagram of the structure of a battery provided in an embodiment of the present application. This embodiment provides a battery, which includes a current collecting plate 10, an electrode lead terminal and a pole lug (not shown in the figure), the current collecting plate 10 includes a bending portion 11 and a connecting portion 12, one end of the bending portion 11 is connected to the connecting portion 12, the other end of the bending portion 11 is connected to the electrode lead terminal, the connecting portion 12 is welded to the pole lug to form a pole lug weld mark 120, the pole lug weld mark 120 includes a first weld mark 121, a bending line is provided between the bending portion 11 and the connecting portion 12, the first weld mark 121 is located at one end of the connecting portion 12 close to the bending portion 12, and the extension direction of the first weld mark 121 is arranged at an acute angle to the bending line.

[0048] It should be noted that the above-mentioned tabs are an important component of the battery, used to connect the positive and negative electrodes of the battery. The tabs are metal conductors that lead out the positive and negative electrodes of the battery. These conductors play a connecting role during the battery charging and discharging process. The tabs are usually composed of two parts: a film and a metal strip. The film provides insulation protection to ensure that there is no short circuit during battery packaging, and is sealed and bonded to the aluminum-plastic film by hot melt by heating to prevent leakage. The materials of the tabs are mainly divided into three categories: aluminum (Al) materials can be used for the positive electrode, nickel (Ni) materials can be used for the negative electrode, and copper-plated nickel (Ni-Cu) materials are used for the negative electrode. Different types of tabs are suitable for different application scenarios. For example, aluminum tabs are often used for the positive electrode, while nickel tabs and copper-plated nickel tabs are used for the negative electrode, respectively.

[0049] The electrode lead terminal is also called the electrode column, which may include a positive terminal and a negative terminal. The electrode column is another important component of the battery. It is the collector of the battery and a special structure with strong corrosion resistance. It is generally composed of a column, a column head, a column bottom, etc.

[0050] The current collecting plate 10 is used to lead the electric energy of the battery core to the positive or negative terminal of the battery through the pole ear. The current collecting plate 10 includes a bending portion 11 and a connecting portion 12. The connecting portion 12 can serve as the main body of the current collecting plate 10. One end of the bending portion 11 is connected to the connecting portion 12, and the other end of the bending portion 11 is connected to the electrode lead-out terminal, for example, by welding or riveting. The shape of the bending portion 11 can be rectangular or square, and the shape of the connecting portion 12 can be approximately circular, hexagonal, octagonal, etc.

[0051] The above-mentioned tab weld mark 120 may be an integral area located on the connecting portion 12 , or may be a plurality of dispersed areas located on the connecting portion 12 . The tab weld mark 120 is formed by welding the connecting portion 12 to the tab.

[0052] The tab weld mark 120 includes a weld mark 121 . The first weld mark 121 is located at one end of the connecting portion 12 close to the bending portion 11 , and an extending direction of the first weld mark 121 forms an acute angle with an extending direction of the bending line.

[0053] It is understandable that the first weld mark 121 can be a long strip area located on the connecting portion 12, or a wavy area, or an area of ​​other shapes. There is a bending line between the bending portion 11 and the connecting portion 12, and the extension direction of the first weld mark 121 is set at an acute angle to the extension direction of the bending line. In this embodiment, since the extension direction of the first weld mark 121 is set at an acute angle to the extension direction of the bending line, the force area when the bending portion 11 and the connecting portion 12 are bent can be increased, and the weld mark can be prevented from being pulled when the bending portion 11 and the connecting portion 12 of the collector are bent.

[0054] Among them, when the connection part 12 is connected to the pole ear by welding, the connection part 12 can be fixed together with the pole ear by heat welding through the pole ear welding mark 120, and its connection is firm and reliable, and it is suitable for high voltage and high current applications. The welded battery pole ear can choose a metal material similar to the electrode sheet material, generally using high conductive materials such as copper and aluminum. The welding process needs to control the welding temperature, time and pressure to ensure that the metal bond between the electrode sheet and the pole ear is firm.

[0055] It can be understood that the above-mentioned connecting part 12 is fixedly connected to the pole lug through the pole lug welding mark 120, and is connected to the connecting part 12 through one end of the bending part 11, and the other end of the bending part 11 is connected to the electrode lead terminal, so that a complete conductive circuit can be formed between the entire collecting plate 10 and the pole lug and the electrode lead terminal.

[0056] The battery provided in the embodiment of the present application includes a current collecting plate 10, a battery lead terminal and a pole ear. The current collecting plate 10 includes a bending portion 11 and a connecting portion 12. One end of the bending portion 11 is connected to the connecting portion 12, and the other end of the bending portion 11 is connected to the electrode lead terminal. The connecting portion 12 is welded to the pole ear to form a pole ear weld mark 120. The pole ear weld mark 120 includes a first weld mark 121. A bending line is provided between the bending portion 11 and the connecting portion 12. The first weld mark 121 is located at one end of the connecting portion 12 close to the bending portion 11, and the extension direction of the first weld mark 12 is arranged at an acute angle to the extension direction of the bending portion 11. Compared with the prior art, the battery provides more weldable sites on the current collecting disk because the connecting portion 12 of the current collecting disk body is provided with a pole ear weld mark 120 welded to the pole ear, thereby preventing the weld mark from being pulled when the bending portion 11 of the current collecting disk and the connecting portion 12 are bent, ensuring that the connecting part of the main body will not be deformed by force when the current collecting disk 10 is folded by the bending portion 11, and the extension direction of the first weld mark 121 is set at an acute angle to the extension direction of the bending line, which can increase the force area during bending and improve the welding strength. At the same time, the connecting portion 12 is connected to the pole ear through the pole ear weld mark 120, which can ensure the welding strength while also enhancing the current passing capacity. At the same time, the bending portion 11 is connected to the electrode lead terminal, so that a complete conduction circuit is formed between the entire current collecting disk 10 and the pole ear and the electrode lead terminal, greatly improving the connection reliability of the current collecting disk 10.

[0057] In one embodiment, see Figure 1 As shown, the extension direction of the first weld mark 121 is parallel to the extension direction of the bending line.

[0058] When the first weld mark 121 is in the shape of an elongated strip and the extension direction of the bending line is along the width direction of the bending portion 11 , the extension direction of the first weld mark 121 is parallel to the extension direction of the bending line, that is, it also extends along the width direction of the bending portion 11 .

[0059] In this embodiment, by setting the extension direction of the first weld mark 121 parallel to the extension direction of the bending line, the force area of ​​the bending portion 11 and the connecting portion on the collecting plate can be increased when bending, avoiding stress deformation when the bending portion 11 folds over the connecting portion 12 of the collecting plate 10 body, thereby greatly improving the welding strength.

[0060] The tab weld marks 120 further include a plurality of second weld marks 122 , and the second weld marks 122 are disposed on the connecting portion 12 in an area other than the first weld marks 121 .

[0061] The second weld mark 122 may be rectangular, wavy, or diamond-shaped, etc. The second weld mark 122 may be provided independently of the first weld mark.

[0062] It should be noted that the first weld mark 121 is located on one end of the connecting portion 12 close to the bending portion 11. For example, when the connecting portion 12 is approximately circular, the first weld mark 121 can be set on the connecting portion 12 and close to the connecting portion between the bending portion 11 and the connecting portion 12, and the second weld mark 122 can be set on the area on the circle except the first weld mark 121.

[0063] Optionally, the second weld mark 122 is radially arranged from the center of the connecting portion 12 to the edge of the connecting portion 12 .

[0064] It should be noted that the second weld mark 122 is radially arranged from the center of the connecting portion 12 to the edge of the connecting portion 12. It can be understood that when the connecting portion 12 is approximately circular, the second weld mark 122 can be arranged from the center of the circle to the edge of the circle; when the connecting portion 12 is hexagonal or octagonal, the second weld mark 122 can be arranged from the center of the hexagon or octagon to the edge.

[0065] In this embodiment, by radially arranging the second weld mark 122 from the center of the connecting portion 12 to the edge of the connecting portion 12, the connection area between the tab and the connecting portion 12 can be increased, more welding points are provided, and the welding strength is comprehensively improved.

[0066] In one embodiment, the tab weld mark 120 further includes at least one third weld mark 123 , and the first weld mark 121 is connected to the third weld mark 123 .

[0067] Optionally, the first weld mark 121 and the third weld mark 123 may be connected in a “T” shape or in other irregular shapes.

[0068] The first welding mark 121 and the third welding mark 123 are arranged perpendicular to each other.

[0069] It is understandable that the widths of the first weld mark 121 and the third weld mark 123 may be the same or different, and the lengths may be the same or different. The first weld mark 121 may be rectangular, wavy, or diamond-shaped, and the third weld mark 123 may be rectangular, wavy, or diamond-shaped. The first weld mark 121 and the third weld mark 123 are vertically connected to each other.

[0070] In this embodiment, by vertically arranging the first weld mark 121 and the third weld mark 123, the third weld mark 123 can support the first weld mark 121, thereby improving the stability of the connection between the first weld mark 121 and the third weld mark 123, and increasing the force bearing area when the bending portion 11 and the connecting portion 12 are bent, thereby preventing the weld mark from being pulled when the bending portion 11 and the connecting portion 12 of the collecting plate are bent, and at the same time providing a more comprehensive welding point for the pole ear weld mark 120, thereby improving the utilization rate of the area on the connecting portion 12, making the welding strength higher and the current carrying capacity stronger.

[0071] Optionally, the shapes of the plurality of second weld marks 122 may be the same or different.

[0072] For example, the multiple second weld marks 122 can all be rectangular, or the multiple second weld marks 122 can include two shapes, one part of which is rectangular and the other part is wavy; or the multiple second weld marks 122 can include multiple shapes, for example, one part is rectangular, another part is wavy, and another part is diamond-shaped.

[0073] When the shapes of the plurality of second welding marks 122 are the same, the intervals between two adjacent second welding marks 122 are equal.

[0074] In this embodiment, when the shapes of multiple second weld marks 122 are the same, the spacing between two adjacent second weld marks 122 is equal, which can ensure that the pole ear is evenly connected to the connecting portion 12 of the rapid flow disk, increase the connection area, provide more welding sites, ensure welding strength, and also improve the current carrying capacity.

[0075] In one embodiment, the collecting plate 10 further includes: an exhaust hole 14 , and the exhaust hole 14 is located between two adjacent second weld marks 122 .

[0076] It should be noted that the exhaust hole 14 can be square, circular, hexagonal, octagonal, etc. The shape of the exhaust hole 14 is not limited in this embodiment, as long as the exhaust hole 14 can be used for exhaust. The hole depth of the exhaust hole 14 is the same as the thickness of the collecting plate 10.

[0077] Optionally, the exhaust holes 14 are radially arranged from the center of the connecting portion 12 to the edge of the connecting portion 12 and are located between two adjacent second weld marks 122 .

[0078] The exhaust hole 14 is located between two adjacent second weld marks 122, and may be a through hole of one shape, such as a rectangle; or two through holes of different shapes, such as a rectangle and a triangle; or multiple through holes of different shapes, such as a rectangle, a triangle, and a diamond. The through holes of different shapes are arranged independently of each other.

[0079] It is understandable that one through hole may be provided radially between the two adjacent second weld marks 122, or two or more through holes may be provided radially. The shape and number of the through holes provided between each two adjacent second weld marks 122 may be the same or different. When the shape and number of the through holes provided between the two adjacent second weld marks 122 are the same, it is possible to ensure that the exhaust holes 14 are evenly provided on the connecting portion 12, thereby ensuring the uniformity of exhaust, and greatly improving the exhaust capacity of the collecting plate 10.

[0080] In one embodiment, the current collecting plate 10 further includes: a central hole 13, which is located at the center of the connecting portion 12. The exhaust hole 14 includes a first through hole 141 and a second through hole 142, wherein the first through hole 141 is located between two adjacent second weld marks 122 and is disposed close to the central hole 13; and the second through hole 142 is located between two adjacent second weld marks 122 and is disposed away from the central hole 13.

[0081] It should be noted that the above-mentioned center hole 13 can be square, circular, hexagonal, octagonal, etc. The hole depth of the center hole 13 is the same as the thickness of the collecting plate 10. This embodiment does not limit the shape of the center hole 13, as long as the center hole 13 can be used for exhaust, the hole depth of the center hole 13 is the same as the thickness of the collecting plate 10.

[0082] The center hole 13 is also called the injection hole, which is used for injection to accelerate the electrolyte infiltration into the active material, and can also be used for exhaust to prevent the battery cell from expanding due to gas docking around it during use of the battery cell under extreme conditions.

[0083] In this embodiment, the exhaust holes 14 are radially arranged from the center of the connecting portion 12 to the edge of the connecting portion 12 and are located between two adjacent second weld marks 122, so that the space on the connecting portion 12 can be fully utilized and evenly distributed on the collecting plate 10, thereby improving the exhaust capacity of the collecting plate 10.

[0084] In this embodiment, when the connecting portion 12 is circular, since the distance between two adjacent second weld marks 122 increases from the center to the edge, and the first through hole 141 is arranged closer to the center hole 13 than the second through hole 142, the area of ​​the first through hole 141 is smaller than the area of ​​the second through hole 142.

[0085] In this embodiment, since the exhaust hole 14 includes the first through hole 141 and the second through hole 142, and the first through hole 141 is located between two adjacent second weld marks 122 and is close to the center hole 13, and the second through hole 142 is located between two adjacent second weld marks 122 and is away from the center hole 13, the first through hole 141 and the second through hole 142 can be more evenly distributed on the connecting portion 12, and the space between the two adjacent second weld marks 122 is fully utilized, thereby greatly improving the flow capacity.

[0086] In one embodiment, the connection portion 12 and the exhaust hole 14 meet the range: 3mm≤d1≤10mm, and / or, d2>2*D1, and / or, d1+2mm<d3<d4<d5<d1-2mm, and / or, 2mm≤d6≤10mm;

[0087] Among them, D1 is the width of the bending portion 11; d1 is the diameter of the center hole 13, d2 is the diameter of the connecting portion 12, d3 is the maximum distance between the center of the center hole 13 and the first through hole 141, d4 is the minimum distance between the center of the center hole 13 and the second through hole 142, d5 is the maximum distance between the center of the center hole 13 and the second through hole 142, and d6 is the spacing between two adjacent second through holes 142.

[0088] It should be noted that the maximum distance between the center of the above-mentioned center hole 13 and the first through hole 141 can be understood as the distance between the center of the center hole 13 and the outer arc line of the first through hole 141, the maximum distance between the center of the above-mentioned center hole 13 and the second through hole 142 can be understood as the distance between the center of the center hole 13 and the outer arc line of the second through hole 142, the minimum distance between the center of the above-mentioned center hole 13 and the second through hole 142 can be understood as the distance between the center of the center hole 13 and the inner arc line of the second through hole 142, and the spacing between two adjacent second through holes 142 can be understood as the distance between two straight lines of two adjacent second through holes 142.

[0089] In this embodiment, by setting the diameter range of d1 to meet the range of 3mm≤d1≤10mm, the exhaust performance and electrolyte infiltration ability of the center hole 13 can be guaranteed, and the exhaust performance is improved. And by setting the diameter of the connecting portion 12 of the current collecting plate 10 to meet the range of d2>2*D1, the strength of the main part of the current collecting plate 10 can be ensured, and the connecting portion 12 of the main body will not be deformed by force when folded, and by setting the sizes d3, d4, and d5 of the exhaust holes 14 on the current collecting plate 10 to d1+2mm<d3<d4<d5<d1-2mm, the gap of each exhaust hole 14 in the radial direction can be guaranteed, so that the exhaust effect of the first through hole 141 and the second through hole 142 is better. By setting the spacing d6 between two adjacent second through holes 142 to meet the range of 2mm≤d6≤10mm, the gap of the exhaust hole 14 can be set better, which not only ensures the strength of the main part of the current collecting plate 10, but also meets the exhaust requirements.

[0090] In one embodiment, the bending portion 11 includes at least two bending notches, and the at least two bending notches are arranged opposite to each other, and a bending line is formed between the two bending notches.

[0091] Among them, the above-mentioned bending notch is used to realize the bending positioning of the current collecting plate 10 inside the battery cell, so that the terminal connection area 1110 matches the center of the connecting portion 12. The above-mentioned multiple bending notches are used to provide a bending path for the bending portion 11, and may include at least two bending notches, and are located on both sides of the length direction of the bending portion 110. By bending through the bending notches located on both sides of the bending portion 110, the current collecting plate 10 can be bent and positioned inside the battery cell, ensuring that the bending position of the current collecting plate 10 is more accurate, so that the terminal connection area 1110 matches the center of the connecting portion 12, which can also be understood as matching the center of the central hole 13 of the connecting portion 12.

[0092] Please continue to see Figure 1 As shown, the above-mentioned bending notches include two oppositely arranged first bending notches 1101 and two oppositely arranged second bending notches 1102, the first bending notches 1101 are arranged at an end away from the connecting portion 12, and the second bending notches 1102 are arranged at an end close to the connecting portion 12; the first bending line 1103 formed between the two first bending notches 1101 and the second bending line 1104 formed between the two second bending notches 1102 are parallel to each other and have the same length.

[0093] The first bending notch 1101 includes two notches respectively located on both sides of the length direction of the bending portion 110, and the second bending notch 1102 includes two notches respectively located on both sides of the length direction of the bending portion 110. The sizes of the first bending notch 1101 and the second bending notch 1102 can be the same or different. The spacing between the first bending notch 1101 and the second bending notch 1102 is greater than the distance between the first bending notch 1101 and one end of the installation area 111, or the spacing between the first bending notch 1101 and the second bending notch 1102 is equal to the distance between the first bending notch 1101 and one end of the installation area 111.

[0094] It can be understood that bending along the first bending notch 1101 can form a first bending line 1103, and bending along the second bending notch 1102 can form a second bending line 1104, and the first bending line 1103 and the second bending line 1104 are parallel to each other and have the same length.

[0095] In this embodiment, the first bending line 1103 formed by bending the first bending notch 1101 and the second bending line 1104 formed by bending the second bending notch 1102 are parallel to each other and have the same length, which can enable the terminal connection area 1110 to accurately match the center of the connecting part 12, thereby improving the installation accuracy.

[0096] In one embodiment, the bending portion 11 includes: a mounting area 111 , on which a terminal connection area 1110 is disposed, and the mounting area 111 is connected to the electrode lead terminal through the terminal connection area 1110 .

[0097] It should be noted that the terminal connection area 1110 is used to connect the current collecting plate 10 and the electrode lead terminal. The terminal connection area 1110 can be arranged at the center of the mounting area 111 or at the edge of the mounting area 111. The shape of the terminal connection area 1110 can be circular, triangular, or annular. The width of the bending portion 11 is the same as the width of the mounting area 111.

[0098] By setting the terminal connection area 1110 to be in a circular ring shape, it can be ensured that the battery cell cover plate assembly can be completely matched with the battery cell, which facilitates a tighter installation on the battery cell, thereby improving the adaptability of the cover plate assembly to the battery cell.

[0099] In one embodiment, see Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of the welding area of ​​the current collecting disk before folding provided in an embodiment of the present application. When the terminal connection area 1110 is in a circular ring shape, the terminal connection area 1110 satisfies the range: 0<d7<d8<D1; and / or, the thickness of the current collecting disk satisfies the range: 0.15mm≤H≤0.5mm.

[0100] Wherein, D1 is the width of the bent portion 11 , d7 is the diameter of the inner circle of the annular shape, d8 is the diameter of the outer circle of the annular shape, and H is the thickness range of the collecting plate 10 .

[0101] It should be noted that when the terminal connection area 1110 is in a circular ring shape, the circular ring includes two circles, namely an inner circle and an outer circle, and the diameter of the inner circle is smaller than the diameter of the outer circle.

[0102] In this embodiment, the inner and outer diameters of the annular ring are set to meet the range of 0<d7<d8<D1, so that the current carrying capacity of the terminal connection area 1110 and the electrode lead terminal can be improved while ensuring the welding strength of the installation area 111. And the thickness of the rapid current plate is set to meet the range of: 0.15mm≤H≤0.5mm, which can ensure the strength of the current collecting plate 10 while also improving the current carrying capacity.

[0103] In one embodiment, see Figure 3 As shown, Figure 3 This is a schematic diagram of the size setting structure of the current collecting plate provided in an embodiment of the present application. The above-mentioned bending portion 11 and the installation area 111 meet the range: 10mm≤D1≤D2, and / or, 2*D2<D3, and / or, D3+5mm<D4;

[0104] Among them, D1 is the width of the bending portion 11; D2 is the distance between one end of the installation area 111 away from the connecting portion 12 and the first bending line 1103; D3 is the distance between one end of the installation area 111 away from the connecting portion 12 and the second bending line 1104; D4 is the distance between one end of the installation area 111 away from the connecting portion 12 and the center of the center hole 13.

[0105] It should be noted that the above-mentioned D1 can be understood as the width of the bending portion 11 on the collecting plate 10, D2 can be understood as the distance between the tail of the collecting plate 10 and the first bending line 1103 formed by bending the first bending notch 1101, D3 can be understood as the distance between the tail of the collecting plate 10 and the second bending line 1104 formed by bending the second bending notch 1102, and D4 can be understood as the distance between the tail of the collecting plate 10 and the center of the connecting portion 12.

[0106] In this embodiment, by setting the bending portion 11 and the installation area 111 to meet the above-mentioned range, the bending portion 11 can be bent on the basis of meeting the feasibility of the folding process, so that the center of the installation area 111 matches the center of the connecting portion 12 to improve the installation accuracy.

[0107] In one embodiment, see Figure 2 As shown, when the second weld mark 122 is a rectangular shape, the second weld mark 122 satisfies the range: d9<d10<1 / 2*d2, and / or, 1mm<d12<1 / 2*d6; and / or, the first weld mark 121 satisfies the range: 2mm <d12<d13<D1。

[0108] Among them, D1 is the width of the bending portion 11, d2 is the diameter of the connecting portion 12, d9 is the radial length of the second weld mark 122, d10 is the distance between the center of the center hole 13 and the edge of the second weld mark 122, d12 is the spacing between the second weld mark 122 and the second through hole 142, and d13 is the length of the first weld mark 121 in a direction parallel to the crease line.

[0109] It should be noted that the distance between the second welding mark 122 and the second through hole 142 is the same as the length of the third welding mark 123 in a direction perpendicular to the first bending line 1103 .

[0110] In this embodiment, by setting the second welding mark 122 to satisfy the range: d9 < d10 < 1 / 2 * d2, it can ensure that the current collector plate 10 can be welded from the middle of the electrode core to the edge of the current collector plate 10, reducing the impedance of the battery cell and improving the area utilization rate of the main body part of the current collector plate 10. And by setting to satisfy the range 1mm < d12 < 1 / 2 * d6, it can, while achieving welding positioning, fully set the area of the welding region. Also, by setting the first connection region 121 to satisfy the range 2mm < d12 < d13 < D1, it can make the first welding mark 121 and the third welding mark 123 more reasonably arranged, improving the area utilization rate.

[0111] In one of the embodiments, the current-carrying value of the current collector plate 10 satisfies the range: C1 ≤ C3 ≤ C2.

[0112] Among them, C1 is the current-carrying value between the tab and the current collector plate 10, C1 ≥ 20A, C2 is the current-carrying value between the current collector plate 10 and the electrode lead terminal, and C3 is the current-carrying value of the current conducting from the tab to the electrode lead terminal.

[0113] It should be noted that the above terminal connection region 1110 is circular ring-shaped, and its area can be expressed by the following formula:

[0114]

[0115] Among them, d7 is the diameter of the inner circle of the circular ring, and d8 is the diameter of the outer circle of the circular ring.

[0116] The main welding region, the second welding mark 122, between the current collector plate 10 and the tab is rectangular, and its welding region area can be expressed by the following formula:

[0117] S2 = d11 * d9 * 5;

[0118] Among them, d9 is the radial length of the second welding mark 122, and d11 is the width of the second welding mark 122.

[0119] The secondary welding region between the current collector plate 10 and the tab includes the first welding mark 121 and the third welding mark 123, and the first welding mark 121 and the third welding mark 123 are in a "T" shape, and its welding region area can be expressed by the following formula:

[0120] S3 = d12 * d11 + d13 * d11;

[0121] Among them, d12 is the distance between the second welding mark 122 and the second through hole 142, which is the same as the length of the third welding mark 123, d13 is the length of the first welding mark 121 along the direction parallel to the crease line, and d11 is the width of the second welding mark 122, which is the same as the width of the third welding mark 123.

[0122] After determining all welding areas of the tab welding marks 120 and the terminal connection area 1110, the overcurrent value C1 of the tab and the current collecting plate 10 can be expressed by the following formula:

[0123] (S2+S3)*n*k1=C1;

[0124] The overcurrent value C2 between the current collecting plate 10 and the electrode lead terminal can be expressed by the following formula:

[0125] S1*n*k2=C2;

[0126] The overcurrent value C3 of the current transmitted from the electrode ear to the electrode lead terminal can be expressed by the following formula:

[0127] H*D1*n=C3

[0128] Among them, n is the material's flow coefficient, k is the compensation coefficient, k=effective welding area / theoretical welding area, k1 is the effective welding area of ​​the tab weld mark 120 / theoretical welding area of ​​the tab weld mark 120, k2 is the effective welding area of ​​the terminal connection area 1110 / theoretical welding area of ​​the terminal connection area 1110, H is the thickness range of the collecting plate 10, S1 is the welding area area of ​​the terminal connection area 1110, S2 is the welding area area of ​​the second weld mark 122, and S3 is the welding area area of ​​the first weld mark 121 and the third weld mark 123.

[0129] It is understandable that the battery's overcurrent capacity refers to the maximum current that the battery can withstand when it is working. Generally speaking, the stronger the current overcurrent capacity, the greater the current that the battery can provide, thereby meeting the use requirements of higher power devices. The battery's overcurrent capacity is affected by many factors, such as battery type, battery quality, battery temperature, etc. Generally speaking, the lithium-ion battery has a relatively strong overcurrent capacity and can provide a larger current output.

[0130] In this embodiment, the overcurrent value of the current collecting disk 10 is set to meet the range: C1≤C3≤C2, so that the current can be conducted from the electrode ear to the electrode lead terminal, so that the overcurrent capacity of the structural component is good and C1 meets the minimum overcurrent requirement.

[0131] In one embodiment, see Figure 4 As shown, Figure 4 The schematic diagram of the pre-folding of the current collecting plate provided in the embodiment of the present application is as follows: the bending angle R1 along the first bending notch 1101 meets the range of 60°≤R1≤120°; the bending angle R2 along the second bending notch 1102 meets the range of 70°≤R2≤130°.

[0132] It should be noted that the bending angle R1 along the first bending notch 1101 can be the angle formed by bending the installation area 111 along the first bending notch 1101 toward the direction close to the battery cell, and the bending angle R2 along the second bending notch 1102 can be the angle formed by bending the bending portion 11 connecting the installation area 111 along the first bending notch 1101 toward the direction close to the battery cell.

[0133] In this embodiment, the bending angle R1 along the first bending notch 1101 meets the range of 60°≤R1≤120°, and the bending angle R2 along the second bending notch 1102 meets the range of 70°≤R2≤130°, so as to ensure that the current collecting plate 10 does not affect the subsequent assembly process after bending.

[0134] In one embodiment, see Figure 5 As shown, Figure 5 The schematic diagram of the structure of the current collecting plate after bending is provided in an embodiment of the present application. When the bending portion 11 is bent along the first bending notch 1101 and the second bending notch 1102, the distance d14 between the center of the terminal connection area 1110 and the center hole 13 satisfies the range of 0≤d14≤0.3mm.

[0135] Wherein, d14 is the distance between the center of the circle of the current collecting disk 10 and the terminal connection area 1110 and the center of the central hole 13 of the current collecting disk 10 .

[0136] In this embodiment, after the bending portion 11 is bent along the first bending notch 1101 and the second bending notch 1102, the distance d14 between the center of the terminal connection area 1110 and the center hole 13 satisfies the range of 0≤d14≤0.3mm, which can ensure that the subsequent battery cell cover assembly is completely installed on the battery cell shell, thereby improving the assembly fit.

[0137] On the other hand, in another embodiment of the present application, a battery device is provided, which includes the battery provided by the above embodiment.

[0138] The battery device provided in this embodiment includes the above-mentioned battery, and the battery is provided with a pole ear weld mark welded to the pole ear on the connecting part of the current collecting plate body, thereby providing more weldable sites on the current collecting plate, preventing the welding mark from being pulled when the bending part and the connecting part of the current collecting plate are bent, ensuring that the connecting part of the main body will not be deformed by force when the current collecting plate is folded by the bending part, and the extension direction of the first welding mark is set at an acute angle to the extension direction of the bending line, which can greatly increase the force area during bending and improve the welding strength. At the same time, the connecting part is connected to the pole ear through the pole ear weld mark, which can ensure the welding strength while also enhancing the current passing capacity. At the same time, the bending part is connected to the electrode lead terminal, so that a complete conduction circuit is formed between the entire current collecting plate and the pole ear and the electrode lead terminal, greatly improving the connection reliability of the current collecting plate.

[0139] On the other hand, in another embodiment of the present application, an electrical device is provided. The electrical device includes the battery device provided in the above embodiment or the battery provided in the above embodiment.

[0140] The electrical equipment provided in this embodiment includes the above-mentioned battery device or battery. Since the connecting part of the current collecting plate body is provided with a pole ear weld mark welded to the pole ear, more weldable sites are provided on the current collecting plate, thereby preventing the welding mark from being pulled when the bending part and the connecting part of the current collecting plate are bent, ensuring that the connecting part of the main body will not be deformed by force when the current collecting plate is folded by the bending part, and the extension direction of the first weld mark is set at an acute angle to the extension direction of the bending line, which can greatly increase the force area during bending and improve the welding strength. At the same time, the connecting part is connected to the pole ear through the pole ear weld mark, which can ensure the welding strength while also enhancing the current passing capacity. At the same time, the bending part is connected to the electrode lead terminal, so that a complete conduction circuit is formed between the entire current collecting plate and the pole ear and the electrode lead terminal, greatly improving the connection reliability of the current collecting plate.

[0141] It should be noted that although the operations of the utility model method are described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired results. On the contrary, the steps depicted in the flow chart can change the order of execution. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step, and / or one step can be decomposed into multiple steps.

[0142] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A battery, characterized in that: include: A current collecting plate (10), an electrode lead terminal and a pole lug, wherein the current collecting plate (10) comprises a bent portion (11) and a connecting portion (12), one end of the bent portion (11) is connected to the connecting portion (12), the other end of the bent portion (11) is connected to the electrode lead terminal, the connecting portion (12) is welded to the pole lug to form a pole lug weld mark (120), the pole lug weld mark (120) comprises a first weld mark (121), a bending line is provided between the bent portion (11) and the connecting portion (12), the first weld mark (121) is located at one end of the connecting portion (12) close to the bent portion (11), and the extension direction of the first weld mark (121) is arranged at an acute angle to the extension direction of the bending line.

2. The battery according to claim 1, characterized in that The extension direction of the first weld mark (121) is parallel to the extension direction of the bending line.

3. The battery according to claim 1, characterized in that The tab weld mark (120) further comprises a plurality of second weld marks (122), wherein the second weld marks (122) are arranged on an area of ​​the connection portion (12) other than the first weld marks (121).

4. The battery according to claim 3, characterized in that The second weld mark (122) is radially arranged from the center of the connecting portion (12) to the edge of the connecting portion (12).

5. The battery according to any one of claims 1 to 4, characterized in that: The tab weld mark (120) further comprises at least one third weld mark (123), and the first weld mark (121) is connected to the third weld mark (123).

6. The battery according to claim 5, characterized in that The first welding mark (121) and the third welding mark (123) are arranged vertically.

7. The battery according to claim 3, characterized in that The collecting plate also includes: An exhaust hole (14), wherein the exhaust hole (14) is located between two adjacent second weld marks (122).

8. The battery according to claim 7, characterized in that The exhaust holes (14) are radially arranged from the center of the connecting portion (12) to the edge of the connecting portion (12).

9. The battery according to claim 7, characterized in that The collecting plate further comprises a center hole (13), wherein the center hole (13) is located at the center of the connecting portion (12); the exhaust hole (14) comprises a first through hole (141) and a second through hole (142), wherein the first through hole (141) is located between two adjacent second weld marks (122) and is arranged close to the center hole (13); and the second through hole (142) is located between two adjacent second weld marks (122) and is arranged away from the center hole (13).

10. The battery according to claim 9, characterized in that The connecting portion (12) and the exhaust hole (14) meet the following ranges: 3mm≤d1≤10mm, and / or d2>2*D1, and / or d1+2mm<d3<d4<d5<d1-2mm, and / or 2mm≤d6≤10mm; Wherein, D1 is the width of the bending portion (11); d1 is the diameter of the center hole (13); d2 is the diameter of the connecting portion (12); d3 is the maximum distance between the center of the center hole (13) and the first through hole (141); d4 is the minimum distance between the center of the center hole (13) and the second through hole (142); d5 is the maximum distance between the center of the center hole (13) and the second through hole (142); and d6 is the distance between two adjacent second through holes (142).

11. The battery according to claim 9, characterized in that The bending portion (11) comprises at least two bending notches, the at least two bending notches are arranged opposite to each other, and the bending line is formed between the two bending notches.

12. The battery according to claim 11, characterized in that The bending notches comprise two first bending notches (1101) arranged opposite to each other and two second bending notches (1102) arranged opposite to each other, wherein the first bending notches (1101) are arranged at an end away from the connecting portion (12), and the second bending notches (1102) are arranged at an end close to the connecting portion (12); a first bending line (1103) formed between the two first bending notches (1101) and a second bending line (1104) formed between the two second bending notches (1102) are parallel to each other and have the same length.

13. The battery according to claim 12, characterized in that The bent portion (11) comprises: a mounting area (111), a terminal connection area (1110) being provided on the mounting area (111), and the mounting area (111) being connected to the electrode lead-out terminal via the terminal connection area (1110).

14. The battery according to claim 13, characterized in that When the terminal connection area (1110) is in a circular ring shape, the terminal connection area (1110) satisfies the range: 0<d7<d8<D1, and / or the thickness of the current collecting plate satisfies the range: 0.15mm≤H≤0.5mm; Wherein, D1 is the width of the bent portion (11), d7 is the diameter of the inner circle of the annular shape, d8 is the diameter of the outer circle of the annular shape, and H is the thickness range of the collecting plate.

15. The battery according to claim 13, characterized in that The bending portion (11) and the installation area (111) meet the following ranges: 10 mm ≤ D1 ≤ D2, and / or 2*D2 < D3, and / or D3+5 mm < D4; Wherein, D1 is the width of the bending portion (11); D2 is the distance between one end of the installation area (111) away from the connecting portion (12) and the first bending line (1103); D3 is the distance between one end of the installation area (111) away from the connecting portion (12) and the second bending line (1104); and D4 is the distance between one end of the installation area (111) away from the connecting portion (12) and the center of the center hole (13).

16. The battery according to claim 1, characterized in that The flow value of the current collecting plate (10) satisfies the range: C1≤C3≤C2; Wherein, C1 is the overcurrent value between the electrode tab and the current collecting disk (10), C2 is the overcurrent value between the current collecting disk (10) and the electrode lead terminal, and C3 is the overcurrent value of the current conducted from the electrode tab to the electrode lead terminal.

17. The battery according to claim 13, characterized in that When the bent portion (11) is bent along the first bending notch (1101) and the second bending notch (1102), the distance d14 between the center of the terminal connection area (1110) and the center hole (13) satisfies the range of 0≤d14≤0.3mm.

18. A battery device, characterized in that: The battery device comprises the battery according to any one of claims 1-17.

19. An electrical equipment, characterized in that: The electrical equipment comprises the battery device as claimed in claim 18, or the battery as claimed in any one of claims 1-17.

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