Cylindrical battery and electronic device

Abstract

The utility model provides a cylindrical battery and an electronic device. The cylindrical battery comprises a shell and a cover plate, the shell comprises a surrounding side wall, and an opening is formed in one end of the side wall; the cover plate is installed at the opening in a sealed mode, the cover plate comprises a cover plate body and a structural part arranged on the cover plate body, the structural part comprises one or a combination of a protrusion and a recess formed through stamping, the structural part is projected in the thickness direction of the cover plate, and the projection of the structural part is a rotational symmetry graph with the center of the cover plate body as the rotation center; the cover plate comprises an identification part which is eccentrically arranged relative to the center of a cover plate body; according to the utility model, the technical problem that when a certain position of the cover plate has a quality problem, the corresponding problem position on the stamping die is difficult to accurately trace can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical battery and an electronic device. Background Art

[0002] At present, large cylindrical batteries are increasingly favored by major automobile companies due to their high safety, long life, excellent fast charging performance, good battery consistency and low production cost.

[0003] The sealing end of the cylindrical battery is provided with a cover plate, on which a variety of structural parts are arranged. The above structural parts are usually formed by stamping. In order to facilitate processing and assembly, some structural parts are arranged in rotationally symmetrical figures. When a quality problem occurs at a certain position of the cover plate, it is difficult to accurately trace it to the corresponding problem position on the stamping die. Utility Model Content

[0004] The utility model provides a cylindrical battery and an electronic device, so as to improve the technical problem that when a quality problem occurs at a certain position of a cover plate, it is difficult to accurately trace the corresponding problem position on a stamping die.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a cylindrical battery, including a shell and a cover plate; the shell includes a surrounding side wall, one end of which is formed with an opening; the cover plate is sealed and installed in the opening, the cover plate includes a cover plate body and a structural part arranged on the cover plate body, the structural part includes one or a combination of protrusions and depressions formed by stamping, and projected along the thickness direction of the cover plate, the projection of the structural part is a rotationally symmetrical figure with the center of the cover plate body as the rotation center; the cover plate includes an identification part eccentrically arranged relative to the center of the cover plate body.

[0006] In the above technical scheme, when the structural part on the cover plate is a rotationally symmetrical figure with the center of the cover plate as the rotation center, the positional relationship between the cover plate and the stamping die for processing the cover plate is not unique. By providing an identification part on the cover plate, and the identification part is eccentrically arranged relative to the center of the cover plate body, this arrangement can position the cover plate so that there is a unique positional relationship between the cover plate and the stamping die, that is, any position on the cover plate can find a unique corresponding position on the stamping die, which can improve the technical problem that when a quality problem occurs at a certain position of the cover plate, it is difficult to accurately trace the corresponding problem position on the stamping die.

[0007] In an example of the cylindrical battery of the present invention, the identification portion includes one or more combinations of protrusions, depressions, through holes, engravings, spray printing, coatings, QR codes, and bar codes.

[0008] In the above technical solution, a variety of identifiable structures are provided to adapt to different processing techniques and usage requirements, thereby broadening the production and application scope of the product. Different forms of identification parts can also be selected as needed to give the identification parts humanistic meanings, such as brand logos, numbers, or information about products that can be traced back using network links.

[0009] In one example of the cylindrical battery of the present invention, the identification portion is configured as a liquid injection hole that is eccentrically arranged with respect to the center of the cover body.

[0010] In the above technical solution, the eccentrically arranged liquid injection hole can realize both the marking function and the liquid injection function, thereby improving the utilization efficiency of the liquid injection hole.

[0011] In an example of a cylindrical battery of the utility model, the identification portion is configured as a first explosion-proof valve arranged on the cover body, the first explosion-proof valve includes a weak portion arranged on the cover body, the thickness of the weak portion is less than the thickness of the cover bodies on both adjacent sides, and the weak portion is eccentrically arranged relative to the center of the cover body.

[0012] In the above technical solution, the first explosion-proof valve can not only improve the safety performance of the cylindrical battery, but also achieve the function of identification, thereby improving the utilization efficiency of the first explosion-proof valve.

[0013] In an example of the cylindrical battery of the present invention, there are multiple identification parts, and the multiple identification parts are eccentrically arranged relative to the center of the cover body.

[0014] In the above technical solution, the provision of multiple identification parts can improve the speed and accuracy of positioning.

[0015] In an example of the cylindrical battery of the present invention, along the thickness direction of the cover plate, the projection of the identification part and the projection of the structure part do not overlap.

[0016] In the above technical solution, the identification part is arranged at a position outside the structural part, so that clear and accurate positioning can be achieved.

[0017] In one example of a cylindrical battery of the utility model, the structural portion includes a second explosion-proof valve, the second explosion-proof valve includes a weak portion arranged on a cover body, the thickness of the weak portion is less than the thickness of the cover bodies on both sides thereof, and along the radial direction of the cover body, the identification portion is arranged on the inner side or the outer side of the weak portion.

[0018] In the above technical solution, on the cover plate provided with the second explosion-proof valve, the identification part is arranged at a position other than the weak part, which can reduce the influence of the identification part on the original safety performance of the second explosion-proof valve.

[0019] In an example of the cylindrical battery of the utility model, along the thickness direction of the cover plate, the projection of the identification part at least partially overlaps with the projection of the structure part, and the identification part causes the structure part to form a non-rotationally symmetrical pattern.

[0020] In the above technical solution, the projection of the identification part at least partially overlaps with the projection of the structural part. By changing the rotationally symmetrical structure of the structural part into a non-rotationally symmetrical structure, the uniqueness of the positional relationship between the cover plate and the stamping die for processing the cover plate is achieved. In some cases, this setting has the effect of being simple and easy to operate.

[0021] In an example of a cylindrical battery of the utility model, the structural part includes a plurality of reinforcing ribs evenly distributed radially with the center of the cover body as the center, at least one reinforcing rib has a different structure from the other reinforcing ribs, and the reinforcing ribs with different structures are identification parts.

[0022] In the above technical solution, in a cover plate provided with reinforcing ribs evenly distributed radially with the center of the cover plate body as the center, the reinforcing ribs are changed into a non-rotationally symmetrical structure by changing the structure of one of the reinforcing ribs. This setting is simple and easy to operate, and has little effect on the strength of the cover plate.

[0023] In an example of the cylindrical battery of the present invention, the extension length of the identification portion along the circumference of the cover plate is less than 2 mm.

[0024] In the above technical solution, the extension length of the identification portion is limited to within 2 mm, which is conducive to improving the accuracy of tracing.

[0025] The utility model also provides an electronic device, which includes the cylindrical battery mentioned above.

[0026] In the cylindrical battery of the utility model, when the structural part on the cover plate is a rotationally symmetrical figure with the center of the cover plate as the rotation center, the positional relationship between the cover plate and the stamping die for processing the cover plate is not unique. By providing an identification part on the cover plate, and the identification part is eccentrically arranged relative to the center of the cover plate body, this arrangement can position the cover plate so that there is a unique positional relationship between the cover plate and the stamping die, that is, it can be achieved that any position on the cover plate can find a unique corresponding position on the stamping die, which can improve the technical problem that when a quality problem occurs at a certain position of the cover plate, it is difficult to accurately trace the corresponding problem position on the stamping die. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic structural diagram of an example of a cylindrical battery of the utility model;

[0029] Figure 2 This is a schematic diagram of the electrode assembly structure of an example of a cylindrical battery of the utility model;

[0030] Figure 3 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0031] Figure 4 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0032] Figure 5 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0033] Figure 6 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0034] Figure 7 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0035] Figure 8 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0036] Fig. 9 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0037] Fig.10 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0038] Fig.11 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0039] Fig.12 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0040] Fig.13 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0041] Fig.14 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0042] Fig.15 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0043] Fig.16 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0044] Fig.17 This is a schematic structural diagram of a cover plate of an example of a cylindrical battery of the utility model;

[0045] Fig.18 A schematic diagram of an example of a battery pack of the utility model;

[0046] Fig.19 It is a schematic diagram of an example of the electronic device of the present invention.

[0047] Component number description

[0048] 1. electronic device; 10. battery pack; 11. working part; 101. box; 102. box cover; 100. cylindrical battery; 110. shell; 111. end wall; 112. side wall; 113. opening; 120. electrode assembly; 121. positive electrode sheet; 1211. positive electrode current collector; 1212. first coating area; 1213. first uncoated area; 122. separator; 123. negative electrode sheet; 1231. negative electrode The electrode current collector; 1232, the second coating area; 1233, the second uncoated area; 124, the negative electrode ear; 125, the positive electrode ear; 130, the cover plate; 131, the cover plate body; 132, the structural part; 133, the identification part; 134, the first explosion-proof valve; 135, the second explosion-proof valve; 136, the third explosion-proof valve; 137, the weak part; 138, the reinforcing rib; 139, the injection hole; 140, the pole; 150, the insulating part. DETAILED DESCRIPTION

[0049] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0050] When numerical ranges are given in the embodiments, it should be understood that unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are in accordance with the prior art mastery of those skilled in the art and the description of the present invention, and any prior art methods, equipment and materials similar or equivalent to the methods, equipment and materials in the embodiments of the present invention can also be used to implement the present invention.

[0051] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present utility model without substantially changing the technical content.

[0052] The cylindrical battery includes an electrode assembly, which is a component in the cylindrical battery where electrochemical reactions occur and may include one or more electrode assemblies.

[0053] The cylindrical battery also includes a shell, a cover plate and a pole. The shell includes an end wall and a side wall surrounding the end wall. One end of the side wall has an opening. The electrode assembly can be assembled into the shell through the opening of the shell. The pole passes through the end wall and is electrically connected to the electrode assembly to conduct the electric energy generated by the electrode assembly. The cover plate is used to cover the opening of the shell to achieve sealing. Various structural parts are arranged on the cover plate. The above structural parts are usually formed by stamping. In order to facilitate processing and assembly, some structural parts are arranged as rotationally symmetrical figures.

[0054] The inventors discovered during production that when a quality problem occurs at a certain position of the cover plate, the corresponding positions of the cover plate and the stamping die are not unique, and it is difficult to accurately trace the position of the problem on the stamping die.

[0055] In view of this, the utility model provides a technical solution, by setting an identification portion on the cover plate, and the identification portion is eccentrically set relative to the center of the cover plate body. This setting can position the cover plate so that there is a unique positional relationship between the cover plate and the stamping die. This can improve the technical problem that when a quality problem occurs at a certain position of the cover plate, it is difficult to accurately trace the corresponding problem position on the stamping die.

[0056] See also Figures 1 to 19 The utility model provides a cylindrical battery 100 and an electronic device 1 . The cylindrical battery 100 includes a housing 110 , an electrode assembly 120 , a pole 140 , an insulating member 150 and a cover plate 130 .

[0057] See also Figure 1 , Figure 1The schematic diagram of the structure of an example of a cylindrical battery of the utility model; the shell 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111. As long as a stable sealing and electrical connection relationship can be formed, the connection between the end wall 111 and the side wall 112 can be achieved in a variety of ways, such as integral stamping, integral casting or split welding. The surrounding of the side wall 112 is not limited, and can be cylindrical or prismatic, or can be surrounded along any other closed loop contour that can match the end wall 111. In this embodiment, the outer edge of the end wall 111 is circular, and the side wall 112 is cylindrical and surrounds the outer edge of the end wall 111, and a circular opening 113 is formed at the end of the side wall 112 away from the end wall 111. A receiving cavity is formed in the shell 110 surrounded by the end wall 111 and the side wall 112, which is used to accommodate the electrode assembly 120, the electrolyte and other necessary battery components. Specifically, the diameter of the shell 110 can be determined according to the specific size of the electrode assembly 120, such as 18 mm, 21 mm, 46 mm, etc. The shell 110 can be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. In order to prevent the shell 110 from rusting during long-term use, a layer of rust-proof material such as metal nickel can be plated on the surface of the shell 110.

[0058] See also Figure 1 and Figure 2 , Figure 2 The schematic diagram of the electrode assembly structure of an example of a cylindrical battery of the utility model; the electrode assembly 120 is arranged inside the shell 110, and the electrode assembly 120 is a component in which an electrochemical reaction occurs in the cylindrical battery 100. The shell 110 may contain one or more electrode assemblies 120. The electrode assembly 120 includes a pole piece and a diaphragm 122, and the pole piece and the diaphragm 122 are wound to form a winding structure. Specifically, in this embodiment, the electrode assembly 120 includes a positive pole piece 121, a diaphragm 122, and a negative pole piece 123 axially wound around the shell 110.

[0059] The positive electrode sheet 121 includes a positive electrode collector 1211 and a positive electrode active material layer coated on the positive electrode collector 1211. A first coated area 1212 coated with the positive electrode active material layer and a first uncoated area 1213 not coated with the positive electrode active material layer are formed on the positive electrode collector 1211. The first coated area 1212 and the first uncoated area 1213 are arranged axially along the shell 110. The first uncoated area 1213 extends to the outside of the diaphragm 122 at one end in the height direction of the cylindrical battery 100, and is bent toward the axis of the shell 110 to form a stacked positive electrode ear 125.

[0060] The negative electrode sheet 123 includes a negative electrode current collector 1231 and a negative electrode active material layer coated on the negative electrode current collector 1231, and a second coated area 1232 coated with the negative electrode active material layer and a second uncoated area 1233 not coated with the negative electrode active material layer are formed on the negative electrode current collector 1231. The second coated area 1232 and the second uncoated area 1233 are arranged axially along the shell 110, and the second uncoated area 1233 extends to the other end of the cylindrical battery 100 in the height direction to the outside of the diaphragm 122, and is bent toward the axis of the shell 110 to form a stacked negative electrode tab 124.

[0061] The diaphragm 122 is arranged between the positive electrode plate 121 and the negative electrode plate 123 to isolate the positive electrode active material layer from the negative electrode active material layer. Taking the lithium-ion cylindrical battery 100 as an example, the material of the positive electrode current collector 1211 can be aluminum, and the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The material of the negative electrode current collector 1231 can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The base material of the diaphragm 122 can be PP (polypropylene), polypropylene or PE (polyethylene), polyethylene, etc. In order to protect and insulate the battery cell, an insulating film can also be coated on the outside of the battery cell, and the insulating film can be synthesized from PP, PE, PET, PVC or other high molecular polymer materials.

[0062] See also Figure 1 and Figure 2 Further, the positive electrode tab 125 in the present invention faces the end wall 111 or the opening 113, and the negative electrode tab 124 faces the other end of the housing 110. In this embodiment, the positive electrode tab 125 faces the end wall 111 and is electrically connected to the pole 140 so that the pole 140 is positively charged, and the negative electrode tab 124 faces the opening 113, and the housing 110 is electrically connected to the negative electrode tab 124, so that it is negatively charged. However, in other embodiments, the negative electrode tab 124 can be connected to the pole 140, and the positive electrode tab 125 can be connected to the housing 110.

[0063] See also Figure 1 , the pole 140 is installed through the end wall 111 and is insulated from the end wall 111. One end of the pole 140 facing the electrode assembly 120 passes through the end wall 111 to be directly electrically connected to the positive electrode tab 125 or is electrically connected through an indirect transfer. The structure of the pole 140 can be any suitable form that can pass through the end wall 111 and be electrically connected to the positive electrode tab 125 of the electrode assembly 120. For example, the cross-section can be circular, square, prismatic, or a special-shaped profile that can achieve stable electrical conduction. In this embodiment, the cross-section of the pole 140 is circular.

[0064] Please continue reading Figure 1, the pole 140 is electrically insulated from the housing 110. Electrical insulation between the pole 140 and the end wall 111 of the housing 110 can be achieved in various ways. For example, insulation can be achieved by placing an insulating member 150 between the pole 140 and the end wall 111. The insulating member 150 includes a sealing ring with an L-shaped, rectangular or O-shaped cross-section, etc. The material of the sealing ring can be EPDM rubber, fluorosilicone rubber or fluororubber, etc., but is not limited thereto. Alternatively, insulation can be achieved by forming an insulating coating layer on a portion of the pole 140. Alternatively, some of the above methods can be applied in combination.

[0065] See also Figure 1 The cover plate 130 is sealed and installed on the opening 113; the outer edge shape of the cover plate 130 corresponds to the shape of the opening 113, which is also circular, and is connected to the side wall 112 to seal the opening 113. The installation method of the cover plate 130 includes but is not limited to mechanical sealing or welding sealing. In this embodiment, the cover plate 130 is sealed and blocked on the opening 113 by mechanical sealing.

[0066] Specifically, see Figures 3 to 17 The cover plate 130 includes a cover plate body 131 and a structural portion 132 arranged on the cover plate body 131. The shape of the cover plate body 131 can be any rotationally symmetrical figure, which is not limited to this. The cover plate body 131 in this embodiment is circular, and the structural portion 132 includes one or a combination of protrusions and depressions formed by stamping. Projected along the thickness direction of the cover plate 130, the projection of the structural portion 132 is a rotationally symmetrical figure with the center of the cover plate body 131 as the rotation center. The cover plate 130 is usually formed by stamping, so the structural portion 132 can be a protrusion protruding from the cover plate body 131, or a depression recessed in the cover plate body 131, or a through hole, or a combination of protrusions and depressions, or all three forms of protrusions, depressions and through holes. This is not limited in this embodiment, but the projection of the structural portion 132 can be a rotationally symmetrical figure with the center of the cover plate body 131 as the rotation center.

[0067] Considering that although the structure of the above-mentioned cover plate 130 has good processing and assembly process performance, the positional relationship between the cover plate 130 and the stamping die for processing the cover plate 130 is not unique. When a quality problem occurs at a certain position of the cover plate 130, it is difficult to accurately trace it back to the corresponding problem position on the stamping die. Furthermore, the cover plate 130 also includes an identification portion 133 eccentrically arranged relative to the center of the cover plate body 131. The identification portion 133 can position the cover plate 130 so that the cover plate 130 has a unique positional relationship with the stamping die, that is, any position on the cover plate 130 can find a unique corresponding position on the stamping die, which can improve the above-mentioned technical problems.

[0068] See also Figures 3 to 7In an example of the cylindrical battery 100 of the utility model, the identification part 133 includes a combination of one or more of convexity, concaveness, through hole, engraving, spray printing, two-dimensional code and bar code. For example, the identification part 133 can be only one of convexity, concaveness, through hole, engraving, spray printing, coating, two-dimensional code and bar code, or it can be set to a combination of convexity and concaveness, a combination of convexity and can, a combination of concave and spray printing, etc., which are not given one by one here. By providing a variety of identifiable structures to adapt to different processing techniques and usage requirements, the production and application scope of the product is broadened. Different forms of identification parts 133 can also be selected as needed to give the identification part 133 humanistic meaning, such as a geometric shape symbolizing a brand logo, a number symbolizing a production batch or a special meaning, and a two-dimensional code or bar code that uses a network link to trace product information.

[0069] See also Figure 3 , Figure 3 This is a schematic diagram of the structure of a cover plate of an example of a cylindrical battery of the utility model; in an example of a cylindrical battery 100 of the utility model, the identification portion 133 is configured as a liquid injection hole 139 that is eccentrically arranged with respect to the center of the cover plate body 131. The shape of the liquid injection hole 139 is not limited, and it can be a through hole of a circular, square, polygonal or other irregular shape, as long as the liquid injection hole 139 is eccentrically arranged relative to the center of the cover plate body 131. In this embodiment, the liquid injection hole 139 is provided with a circular hole, and is eccentrically arranged with respect to the center of the cover plate body 131. The eccentrically arranged liquid injection hole 139 can realize both the function of identification and the function of liquid injection. One structure has multiple uses, which improves the utilization efficiency of the liquid injection hole 139.

[0070] See also Figure 4 , Figure 4 The schematic diagram of the structure of the cover of an example of the cylindrical battery of the utility model; in an example of the cylindrical battery 100 of the utility model, the identification part 133 is configured as a first explosion-proof valve 134 provided on the cover body 131, and the first explosion-proof valve 134 includes a weak part 137 provided on the cover body 131, the thickness of the weak part 137 is less than the thickness of the cover bodies 131 on both sides thereof, the weak part 137 is eccentrically arranged relative to the center of the cover body 131, and the shape of the weak part 137 is not limited, for example, it can be circular, square, polygonal or other irregular shapes, as long as it is eccentrically arranged relative to the center of the cover body 131. In this embodiment, the shape of the weak part 137 is circular, and the circular shape does not coincide with the center of the cover body 131. The first explosion-proof valve 134 can realize the function of identification while improving the safety performance of the cylindrical battery 100, thereby improving the utilization efficiency of the first explosion-proof valve 134.

[0071] See also Figure 5 , Figure 5The schematic diagram of the structure of the cover plate of the cylindrical battery of the utility model; in the example of the cylindrical battery 100 of the utility model, there are multiple identification parts 133, for example, there can be 2, 3, 4 or more, and the shapes of the multiple identification parts 133 are not limited. The multiple identification parts 133 can be of the same shape or different shapes, for example, they can all be circular, square, polygonal or other irregular shapes, or the multiple identification parts 133 can be circular, square, polygonal, etc., as long as the combination of the multiple identification parts 133 is eccentrically arranged relative to the center of the cover body 131. It should be noted that when the shapes of the multiple identification parts 133 are the same, the positional relationship between the multiple identification parts 133 can be set so that the center of the multiple identification parts 133 does not coincide with the center of the cover body 131. For example, in this embodiment, two identification parts 133 are provided, both of which are circular in shape, and the midpoint of the line connecting the centers of the two circular identification parts 133 is the center of the identification part 133, and the center does not coincide with the center of the cover body 131. The setting of multiple identification parts 133 can improve the speed and accuracy of positioning.

[0072] See also Figure 6 to Figure 7 In an example of the cylindrical battery 100 of the utility model, along the thickness direction of the cover plate 130, the projection of the identification part 133 does not overlap with the projection of the structure part 132. That is, the identification part 133 is arranged outside the structure part 132, and this arrangement avoids the overlap with the structure part 132, so that clear and accurate positioning can be achieved.

[0073] Please continue reading Figure 6 to Figure 7 In one example of the cylindrical battery 100 of the utility model, the structural part 132 includes a second explosion-proof valve 135, and the second explosion-proof valve 135 includes a weak portion 137 provided on the cover body 131. The thickness of the weak portion 137 is less than the thickness of the cover bodies 131 on both sides thereof. The shape of the weak portion 137 is not limited, and for example, it may be circular, square, polygonal or other irregular shapes. The weak portion 137 in this embodiment is circular; along the radial direction of the cover body 131, in one embodiment, refer to Figure 6 , Figure 6 FIG. 1 is a schematic diagram of a cover plate of an example of a cylindrical battery of the present invention. The identification portion 133 is disposed on the outer side of the weak portion 137. In another embodiment, see FIG. Figure 7 , Figure 7 This is a schematic diagram of the structure of a cover plate of an example of a cylindrical battery of the utility model, in which the identification portion 133 is arranged on the inner side of the weak portion 137. On the cover plate 130 provided with the second explosion-proof valve 135, the identification portion 133 is arranged at a position other than the weak portion 137, which can reduce the impact of the identification portion 133 on the original safety performance of the second explosion-proof valve 135.

[0074] Please refer to 8 to Fig.11In an example of the cylindrical battery 100 of the utility model, along the thickness direction of the cover plate 130, the projection of the identification part 133 at least partially overlaps with the projection of the structure part 132. It can be understood that the projection of the identification part 133 can overlap with the projection of the structure part 132, or only partially overlap with the projection of the structure part 132. As long as the identification part 133 at least partially overlaps with the structure part 132, the identification part 133 can realize the formation of a non-rotationally symmetrical pattern of the structure part 132. By changing the rotationally symmetrical structure of the structure part 132 to a non-rotationally symmetrical structure, the uniqueness of the positional relationship between the cover plate 130 and the stamping die for processing the cover plate 130 is realized. In some cases, this setting has the effect of being simple and easy to operate.

[0075] See 8, Figure 8 Schematic diagram of the structure of the cover of an example of a cylindrical battery of the utility model; in an example of the cylindrical battery 100 of the utility model, the structural part 132 includes a third explosion-proof valve 136, and the third explosion-proof valve 136 includes a weak portion 137 provided on the cover body 131, and the thickness of the weak portion 137 is less than the thickness of the cover body 131 on both sides thereof. The shape of the weak portion 137 is not limited, for example, it can be a circle, a square, a polygon or other irregular shapes. In one embodiment, please refer to Figure 8 , the weak portion 137 is circular; the marking portion 133 is arranged on the weak portion 137, and along the thickness direction of the cover plate body 131, the thickness of the marking portion 133 is not equal to the thickness of the weak portion 137. On the cover plate 130 provided with the third explosion-proof valve 136, the rotational symmetry of the third explosion-proof valve 136 is changed by changing the thickness of a certain position on the weak portion 137, and the position where the thickness changes is the marking portion 133, and the setting is simple and easy to operate.

[0076] Please refer to 9 to Fig.11 In one example of the cylindrical battery 100 of the utility model, the structural part 132 includes a plurality of reinforcing ribs 138 uniformly distributed radially with the center of the cover body 131 as the center. The number of reinforcing ribs 138 is not limited, and can be 2, 3, 4, 5, 6, 8, 9 or 10, etc. In this embodiment, the number of reinforcing ribs 138 is 8, and at least one of the plurality of reinforcing ribs 138 has a different structure from the other reinforcing ribs 138, and the reinforcing ribs 138 with different structures are the identification parts 133. In one embodiment, please refer to Fig. 9 , Fig. 9 Schematic diagram of the structure of a cover plate of an example of a cylindrical battery of the utility model; one of the original eight reinforcing ribs 138 is removed to become seven, so that it becomes a non-rotationally symmetrical structure, and the portion without the reinforcing rib 138 is the identification portion 133; in another embodiment, please refer to Fig.10 , Fig.10Schematic diagram of the structure of an example of a cylindrical battery of the utility model; a marking portion 133 recessed in the reinforcing rib 138 is provided on one of the reinforcing ribs 138; in another embodiment, please refer to Fig.11 , Fig.11 Schematic diagram of the structure of a cover plate of an example of a cylindrical battery of the utility model; an identification portion 133 protruding from the reinforcing rib 138 is provided on one of the reinforcing ribs 138; the above three forms all change the structure of one of the reinforcing ribs 138 to change the reinforcing rib 138 into a non-rotationally symmetrical structure to achieve positioning of the cover plate 130, so that the cover plate 130 has a unique positional relationship with the stamping die. The setting is simple and easy to operate, and has little effect on the strength of the cover plate 130.

[0077] In one example of the cylindrical battery 100 of the present invention, the identification portion 133 includes a protrusion or a depression with a circular contour. For example, in one embodiment, see Fig.12 , Fig.12 Schematic diagram of the structure of a cover plate of an example of a cylindrical battery of the utility model; the identification portion 133 is a circular protrusion. In another embodiment, please refer to Fig.13 , Fig.13 The schematic diagram of the structure of the cover plate of an example of a cylindrical battery of the utility model; the identification part 133 is a circular depression. The circular profile structure is simple and easy to form and demould.

[0078] In one example of the cylindrical battery 100 of the present invention, the identification portion 133 includes a protrusion or a depression with a long strip profile. For example, in one embodiment, see Fig.14 , Fig.14 The structural diagram of the cover plate of an example of a cylindrical battery of the utility model; the identification portion 133 is a protrusion with a long strip profile. In the second embodiment, please refer to Fig.15 , Fig.15 This is a schematic diagram of the structure of a cover plate of an example of a cylindrical battery of the utility model, in which the identification portion 133 is a depression with a long strip profile. The long strip profile has a simple structure and is easy to form and demould.

[0079] In one example of the cylindrical battery 100 of the present invention, the identification portion 133 includes a protrusion or a depression having an arc-shaped oblong contour. Fig.16 , Fig.16 Schematic diagram of the structure of a cover plate of an example of a cylindrical battery of the utility model; the identification portion 133 is a protrusion with an arc-shaped oblong profile. In another embodiment, please refer to Fig.17 , Fig.17 The structural diagram of the cover plate of an example of a cylindrical battery of the utility model is shown in FIG. 1 ; the identification portion 133 is a depression with an arc-shaped oblong profile. The arc-shaped oblong profile is accurately positioned, and is convenient for molding and demoulding, and also has the effect of increasing the strength of the cover plate 130 .

[0080] In an example of the cylindrical battery 100 of the present invention, the extension length of the identification portion 133 along the circumference of the cover plate 130 is less than 2 mm. Limiting the extension length of the identification portion 133 to within 2 mm is conducive to improving the accuracy of tracing.

[0081] See also Fig.19 , Fig.19 The utility model is a schematic diagram of an example of an electronic device of the utility model; the utility model also provides an electronic device 1, the electronic device 1 includes the above-mentioned cylindrical battery 100, specifically, a plurality of cylindrical batteries 100 are connected in series or in parallel, or in series and in parallel to form a battery pack 10, and the working part 11 is electrically connected to the battery pack 10 to obtain power support, see Fig.18 , Fig.18 Schematic diagram of an example of a battery pack of the utility model; as an example, the battery pack 10 also includes a box body 101 and a box cover 102, a plurality of cylindrical batteries 100 are placed in the box body 101, and the box cover 102 is sealed on the box body 101 to protect the plurality of cylindrical batteries 100. It should be noted that the battery pack 10 may also include a battery pack thermal management system, a circuit board and other parts in addition to the cylindrical battery 100 of the utility model, and the battery pack 10 may be a battery module, a battery pack, an energy storage cabinet, etc.; they will not be described one by one here.

[0082] As an example, the electronic device 1 is a vehicle, which 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., but is not limited thereto. The working part 11 is a vehicle body, and the battery pack 10 is arranged at the bottom of the vehicle body and provides power support for the driving of the vehicle or the operation of the electrical components in the vehicle. However, in some other embodiments, the electronic device 1 can also be a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy and an electric tool, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; the working part 11 can be a unit component that can obtain the power of the battery pack 10 and perform corresponding work, such as a fan blade rotation unit of a fan, a vacuum cleaner unit, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiment of the present application does not impose any special limitation on the electronic device 1 .

[0083] In the cylindrical battery of the utility model, when the structural part on the cover plate is a rotationally symmetrical figure with the center of the cover plate as the rotation center, the positional relationship between the cover plate and the stamping die for processing the cover plate is not unique. By setting the identification part on the cover plate, and the identification part is eccentrically set relative to the center of the cover plate body, the setting can position the cover plate so that the cover plate and the stamping die have a unique positional relationship, that is, it can be achieved that any position on the cover plate can find a unique corresponding position on the stamping die, which can improve the technical problem that it is difficult to accurately trace the corresponding problem position on the stamping die when a quality problem occurs at a certain position of the cover plate. Therefore, the utility model effectively overcomes some practical problems in the prior art and has a high utilization value and use significance. The above embodiments are only illustrative of the principles and effects of the utility model, and are not used to limit the utility model. Anyone familiar with this technology can modify or change the above embodiments without violating the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the utility model should still be covered by the claims of the utility model.

Claims

1. A cylindrical battery, characterized in that: include: The housing comprises a surrounding side wall, one end of which is formed with an opening; a cover plate, sealingly mounted on the opening, the cover plate comprising a cover plate body and a structural part arranged on the cover plate body, the structural part comprising one or a combination of protrusions and depressions formed by stamping, and projected along the thickness direction of the cover plate, the projection of the structural part is a rotationally symmetrical figure with the center of the cover plate body as the rotation center; Wherein, the cover plate includes an identification portion which is eccentrically arranged relative to the center of the cover plate body.

2. The cylindrical battery according to claim 1, characterized in that: The identification portion includes one or more combinations of protrusions, depressions, through holes, engravings, spray prints, coatings, two-dimensional codes, and bar codes.

3. The cylindrical battery according to claim 1, characterized in that: The identification portion is configured as a liquid injection hole that is eccentrically arranged with respect to the center of the cover plate body.

4. The cylindrical battery according to claim 1, characterized in that: The identification portion is configured as a first explosion-proof valve arranged on the cover body, the first explosion-proof valve includes a weak portion arranged on the cover body, the thickness of the weak portion is smaller than the thickness of the cover body on its adjacent two sides, and the weak portion is eccentrically arranged relative to the center of the cover body.

5. The cylindrical battery according to claim 1, characterized in that: There are a plurality of identification parts, and the plurality of identification parts are eccentrically arranged relative to the center of the cover plate body.

6. The cylindrical battery according to claim 1, characterized in that: Along the thickness direction of the cover plate, a projection of the identification portion and a projection of the structure portion do not overlap.

7. The cylindrical battery according to claim 6, characterized in that: The structural part includes a second explosion-proof valve, which includes a weak portion arranged on the cover body, the thickness of the weak portion is smaller than the thickness of the cover body on its adjacent two sides, and along the radial direction of the cover body, the identification portion is arranged on the inner side or the outer side of the weak portion.

8. The cylindrical battery according to claim 1, characterized in that: Along the thickness direction of the cover plate, the projection of the identification portion at least partially overlaps with the projection of the structure portion, and the identification portion enables the structure portion to form a non-rotationally symmetrical pattern.

9. The cylindrical battery according to claim 8, characterized in that: The structural portion includes a plurality of reinforcing ribs uniformly distributed radially with the center of the cover plate body as the center, wherein at least one of the reinforcing ribs has a different structure from the other reinforcing ribs, and the reinforcing ribs with different structures are identification portions.

10. The cylindrical battery according to claim 1, characterized in that: Along the circumference of the cover plate, an extension length of the identification portion is less than 2 mm.

11. An electronic device, characterized in that: A cylindrical battery comprising any one of claims 1 to 10.

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