Current collectors, end cover components, batteries and electrical equipment

Abstract

The present application discloses a current collector, an end cover assembly, a battery and an electrical device, and relates to the field of battery technology. The current collector includes a first connecting portion, a second connecting portion and a bending portion. The first connecting portion and the second connecting portion are connected by the bending portion. When the current collector is in a folded state, the current collector is bent at the bending portion, and the cross-section along the thickness direction of the current collector is arc-shaped. The current collector of the present application only requires one bending process during assembly. On the one hand, it simplifies the assembly process and effectively avoids the current collector from contacting the shell during assembly to cause a short circuit. On the other hand, it simplifies the structure of the current collector and effectively reduces the weight of the current collector.

Description

Technical Field

[0001] The present application generally relates to the field of battery packaging technology, and in particular to a current collector, an end cover assembly, a battery and an electrical device. Background Art

[0002] With the strengthening of environmental awareness and the increasing shortage of energy, lithium-ion batteries have become the first choice of green energy due to their excellent rate performance and cycle performance. They are widely used in portable devices such as headphones, mobile phones, digital, tablets, computers, as well as large equipment such as electric vehicles and energy storage power stations.

[0003] In the related art, when assembling the top cover of a cylindrical battery, the current collector needs to be folded twice, once toward the cell side to connect with the cell, and once toward the pole side to connect with the pole. The process is relatively complicated, and the current collector is prone to contact with the shell during assembly, causing a short circuit. Summary of the invention

[0004] A main purpose of the present application is to provide a current collecting member, an end cover assembly, a battery and an electrical device, which can simplify the current collecting member structure and assembly process, thereby overcoming one or more problems caused by the limitations and defects of the relevant technology at least to a certain extent.

[0005] In order to achieve the above application purpose, this application adopts the following technical solutions:

[0006] According to one aspect of the present application, a current collecting piece is provided, comprising: a first connecting portion; a second connecting portion; a bending portion; the first connecting portion and the second connecting portion are connected by the bending portion, and when the current collecting piece is in a folded state, the current collecting piece is bent at the bending portion, and a cross-section along the thickness direction of the current collecting piece is arc-shaped.

[0007] In the embodiment of the present application, the current collector is provided with a bending portion, and only one bending process is required when welding with the pole, which simplifies the assembly process and effectively avoids the current collector from contacting the shell during assembly to cause a short circuit. The structure of the current collector is simplified, and the weight of the current collector is effectively reduced.

[0008] According to one embodiment of the present application, at least one notch is formed at the connection between the bending portion and the second connecting portion and / or the first connecting portion.

[0009] In the implementation manner of the present application, by providing a notch near the bending portion, it is convenient to determine the bending position and release stress during bending, thereby extending the service life of the current collecting member.

[0010] According to one embodiment of the present application, the first connecting portion, the second connecting portion and the bending portion are configured as an integrated structure with consistent thickness.

[0011] In the embodiments of the present application, the integrated structure and uniform thickness design of the current collecting member facilitate the manufacture of the current collecting member.

[0012] According to an embodiment of the present application, the thickness of the first connection portion, the second connection portion, and the bending portion is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

[0013] In the embodiment of the present application, the thickness of the current collector is relatively thin, and there is no need to thin the first connecting part or the second connecting part. It can be directly welded to the first or pole, which has a simple process, good welding effect, and helps to reduce the weight of the product.

[0014] According to one embodiment of the present application, the second connecting portion is in the shape of a rectangular plate, the bending portion is connected to one side of the width direction of the second connecting portion, the first connecting portion is in the shape of a disc, and the width of the second connecting portion is less than or equal to two-fifths of the diameter of the first connecting portion.

[0015] In the embodiment of the present application, the weight of the current collecting member is further reduced by reducing the length of the second connecting portion.

[0016] According to one embodiment of the present application, the outer arc length of the bending portion is greater than or equal to 2.5 mm.

[0017] In the embodiment of the present application, by setting the length of the bending portion, on the one hand, the area is increased, the current flow effect is improved, and the current conductivity is better; on the other hand, a wider bending area is formed after bending, which improves the elasticity of the current collector.

[0018] According to one embodiment of the present application, the first connecting portion is provided with an opening, and along the thickness direction of the first connecting portion, the orthographic projection of the second connecting portion on the first connecting portion does not overlap with the position of the opening.

[0019] In the embodiment of the present application, the second connection portion is staggered with the position of the opening in the height direction of the battery, which is more conducive to electrolyte injection and improves the space utilization of the end cover assembly in the height direction.

[0020] According to another aspect of the present application, an end cap assembly is provided, comprising: a first electrode, the first electrode comprising at least one pole; a cover plate, the cover plate having at least one mounting hole extending through the cover plate in a thickness direction thereof; and a current collecting member as described in any one of the above items; wherein one end of the first electrode passes through the mounting hole and is welded to the second connecting portion.

[0021] In the embodiment of the present application, the pole of the end cap assembly is welded to the second connection portion of the current collector, and the current collector only needs one bending process when welding with the pole by providing a bending portion, which simplifies the assembly process and effectively avoids the current collector from contacting with the shell during assembly to cause a short circuit. The overall structure of the end cap assembly is more concise and lightweight, and has a longer service life.

[0022] According to an embodiment of the present application, the first electrode includes two poles, the cover plate is formed with two mounting holes penetrating along the thickness direction of the cover plate, and one end of the two poles is welded to the second connecting portion.

[0023] Compared with the single pole design in the prior art, in the embodiment of the present application, the current is conducted through two poles, and the current flow effect is better. In addition, the volume of each pole can be reduced, the internal space structure of the battery can be optimized, and the battery can be miniaturized.

[0024] According to an embodiment of the present application, an explosion-proof valve hole is formed in the middle of the cover plate, and the first electrode is arranged on one side of the explosion-proof valve hole.

[0025] In the implementation manner of the present application, the first electrode is arranged on one side of the explosion-proof valve hole, the internal space structure of the end cover assembly is optimized, and the layout is more reasonable.

[0026] According to one embodiment of the present application, the end cover assembly further includes a second electrode, which is formed integrally with the cover plate and is located on the other side of the explosion-proof hole opposite to the first electrode.

[0027] In the embodiment of the present application, by adding a second electrode to the cover plate, it is convenient to cooperate with other components, for example, to connect with other batteries in parallel or in series, etc. In addition, this arrangement enables the positive pole and the negative pole of the end cap assembly to be located on the same side, which is convenient for the grouping of battery modules and the welding of conductive bars.

[0028] According to one embodiment of the present application, the end cap assembly also includes a pressing block, a first insulating member and a second insulating member, the first electrode is sequentially inserted through the pressing block, the first insulating member, the cover plate and the second insulating member, and the second electrode is formed by protruding through the cover plate in a direction away from the second insulating member.

[0029] In the embodiment of the present application, the protruding structure of the cover plate is used as the second electrode, and there is no need to add an additional pole structure. The structural stability is better and the flow effect of the second electrode can be effectively improved.

[0030] In the embodiment of the present application, the second electrode, the pressing block and the first insulating member are all fan-shaped, and arcs of the three protrude toward the edge of the cover plate.

[0031] In the embodiment of the present application, by providing a fan-shaped structure, the surface area of ​​the second electrode, the pressing block and the first insulating member can be increased, and the space of the end cover assembly can be fully utilized.

[0032] In an embodiment of the present application, one of the cover plate and the second insulating member is provided with a protrusion, and the other is provided with a groove. Both the protrusion and the groove are provided with injection holes. When the groove and the protrusion are plugged into each other, the injection holes of the cover plate and the second insulating member are aligned.

[0033] In the implementation manner of the present application, by providing the protrusions and the grooves, the cover plate and the second insulating member can be installed in an aligned manner to avoid mis-installation.

[0034] According to another aspect of the present application, a battery is provided, comprising a shell having an opening; an electrode assembly accommodated in the shell; and an end cap assembly as described in any one of the above items, wherein the cover plate of the end cap assembly closes the opening of the shell, one side of the cover plate faces the interior of the shell (201), and the first connecting portion of the current collector is electrically connected to the electrode assembly.

[0035] In the embodiment of the present application, the current collector in the battery is provided with a bending portion, and only one bending process is required when welding with the pole, which simplifies the assembly process. The overall structure of the battery is more concise and light, and the service life is longer.

[0036] According to another aspect of the present application, there is provided an electrical device comprising the battery as described above.

[0037] In the embodiment of the present application, only one bending process is required when welding the current collector and the pole of the electrical equipment, which simplifies the assembly process and effectively avoids the current collector from contacting the shell during assembly to cause a short circuit. The overall structure of the electrical equipment is simpler and lighter, and has a longer service life.

[0038] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0040] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0041] Figure 2 is a schematic diagram of an exploded structure of an end cap assembly according to an exemplary embodiment;

[0042] Figure 3is a schematic structural diagram of a current collecting member in an expanded state according to an exemplary embodiment;

[0043] Figure 4 is a schematic structural diagram of a current collecting member in a folded state at a first viewing angle according to an exemplary embodiment;

[0044] Figure 5 yes Figure 3 A schematic structural diagram of the current collecting member in a second viewing angle;

[0045] Figure 6 is based on Figure 5 A schematic diagram of the partial cross-sectional structure of a battery along the AA direction is shown.

[0046] The reference numerals are described as follows:

[0047] 100, end cap assembly; 200, electrode assembly;

[0048] 10. current collecting member; 20. first electrode;

[0049] 11. first connecting portion; 12. second connecting portion; 13. bending portion;

[0050] 111, opening; 112, notch;

[0051] 131. Gap;

[0052] 21. Pole; 22. Pole;

[0053] 211, top plate; 212, column; 213, bottom plate;

[0054] 31. Press block; 32. First insulating member; 33. Cover plate; 34. Second insulating member;

[0055] 311, opening;

[0056] 321, opening; 322, edging;

[0057] 331, mounting hole; 332, explosion-proof valve hole; 333, protrusion; 334, injection hole; 335, second electrode; 336, fan-shaped groove;

[0058] 341, opening; 342, isolation portion; 343, groove; 344, injection hole;

[0059] 201. Shell. DETAILED DESCRIPTION

[0060] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0061] The present application embodiment provides a battery. Figure 1 and Figure 5 As shown, the battery comprises a shell 201, an end cap assembly 100 and an electrode assembly 200. The shell 201 is cylindrical and has an opening. The electrode assembly 200 is accommodated in the shell 201. The end cap assembly 100 is used to close the top opening of the shell 201 and is roughly disc-shaped.

[0062] See also Figure 2 The end cap assembly 100 includes a first electrode 20, a cover plate 33 and a current collector 10. The first electrode 20 includes at least one pole 21, 22. The cover plate 33 is used to close the opening of the battery housing 201. The cover plate 33 is formed with at least one mounting hole 331 that penetrates along the thickness direction of the cover plate 33, and one end of the first electrode 20 passes through the mounting hole 331 and is welded to the current collector 10.

[0063] See also Figure 3-4 The current collector 10 includes a first connection portion 11, a second connection portion 12 and a bending portion 13. The first connection portion 11 and the second connection portion 12 are connected by the bending portion 13. The first connection portion 11 is disposed above the electrode assembly 200 and is electrically connected to the electrode assembly 200, and the second connection portion 12 is used to be electrically connected to the first electrode 20, thereby achieving conduction of the electrode assembly 200.

[0064] By providing the bending portion 13, the current collector 10 only needs one bending process when welding with the first electrode 20, which simplifies the assembly process and effectively prevents the current collector 10 from contacting with the housing 201 during assembly to cause a short circuit. At the same time, the structural structure of the current collector 10 is simplified, and the weight of the current collector 10 is effectively reduced.

[0065] In a specific embodiment, the first connection portion 11 is roughly disc-shaped, and its diameter is slightly smaller than the housing 201, so as to ensure that it has a larger flow area without contacting the housing 201, thereby effectively improving the flow capacity of the battery. Optionally, an opening 111 for circulating electrolyte is provided on the first connection portion 11. The opening 111 can be provided, for example, in the middle of the first connection portion 11 to facilitate the circulation of the electrolyte.

[0066] In a specific embodiment, a notch 112 is provided on the first connection portion 11, and the notch 112 is provided on the other side opposite to the bent portion 13. When a short circuit or other problems occur inside the battery, causing the internal air pressure to increase, a pressure relief channel can be formed through the notch 112 on the first connection portion 11 to ensure improved battery safety.

[0067] In a specific embodiment, the second connection portion 12 is roughly in the shape of a rectangular plate, and the bending portion 13 is connected to one side in the width direction of the second connection portion 12. Most of the orthographic projection of the second connection portion 12 on the first connection portion 11 falls within the first connection portion 11. Therefore, it is convenient to bend the second connection portion 12, and the second connection portion 12 is effectively prevented from contacting the housing 201 during the bending process.

[0068] It can be understood that in other embodiments, the second connecting portion 12 may also be in a disc shape or other shapes, and this embodiment does not impose any specific limitation.

[0069] In a specific embodiment, if Figure 3 As shown, direction O1 is the width direction of the second connection part 12, and direction O2 is the length direction of the second connection part 12. The width S1 of the second connection part 12 is less than or equal to two-fifths of the diameter D of the first connection part 11. For example, the width S1 of the second connection part 12 is one-third, one-quarter, etc. of the first connection part 11. The width S1 of the second connection part 12 only needs to be able to extend to the bottom of the first electrode 20 and weld with the first electrode 20. By reducing the length of the second connection part 12, the overall weight of the current collector 10 can be further reduced to meet the lightweight requirements of the battery.

[0070] In a specific embodiment, the length S2 of the second connection portion 12 is 0.5 to 0.8 times the diameter D of the first connection portion 11. The second connection portion 12 is relatively long, and sufficient welding positions can be ensured when a plurality of first electrodes 20 are provided.

[0071] It should be noted that the direction O1 is the arrangement direction of the first connection portion 11 , the bending portion 13 and the second connection portion 12 . The direction O2 is perpendicular to the direction O1 . Both the direction O1 and the direction O2 are perpendicular to the thickness direction of the current collecting member 10 .

[0072] In a specific embodiment, along the thickness direction of the first connection part 11, the orthographic projection of the second connection part 12 on the first connection part 11 does not overlap with the position of the opening 111 on the first connection part 11. This arrangement makes the second connection part 12 staggered with the opening 111 in the height direction of the battery, which is more conducive to the injection of electrolyte, and the structure is more compact, thereby improving the space utilization of the end cap assembly 100.

[0073] In this example, see Figure 5, when the current collector 10 is in a folded state, the current collector 10 is bent at the bending portion 13, and the cross-section along the thickness direction of the current collector 10 is arc-shaped. It can be understood that the arc shape can be, for example, a large arc structure, a small arc structure or a U-shaped structure. Optionally, the outer arc length S3 of the bending portion 13 is greater than or equal to 2.5 mm. By setting the length of the bending portion 13, on the one hand, the area is increased, the overcurrent effect is improved, and the conductivity of the current is ensured. On the other hand, a wider bending area can be formed after bending, thereby improving the elasticity of the current collector 10. It should be noted that the setting of the outer arc length S3 of the bending portion 13 is related to the overcurrent demand of the battery. If the bending portion 13 is shorter, the overcurrent demand cannot be met. If the bending portion 13 is longer, the weight and cost will increase.

[0074] In this embodiment, at least one notch 131 is formed at the connection between the bending portion 13 and the second connecting portion 12. Specifically, the length S4 of the bending portion 13 in the direction O2 is less than the length S2 of the second connecting portion 12, so that a notch 131 is formed at the connection between the two. Optionally, notches 131 are formed at both ends of the bending portion 13 along the direction O2. The provision of the notch 131 facilitates the bending operation, can release stress during bending, avoids extrusion at the bending position, and improves the service life of the current collector 10. In addition, the provision of the notch 131 can facilitate the positioning of the bending position to avoid operational errors.

[0075] It is understandable that, in other embodiments, a notch may be formed at the connection between the bending portion 13 and the first connecting portion 11 to release the stress generated during bending.

[0076] In a specific embodiment, the length S4 of the bent portion 13 in the direction O2 is 15 to 20 mm. Under this size, miniaturization of the volume and sufficient flow capacity can be ensured.

[0077] In a specific embodiment, the current collecting member 10 is a metal member, for example, aluminum, copper or alloy, etc., and this application does not impose specific restrictions. The first connecting portion 11, the second connecting portion 12 and the bending portion 13 can be an integrated structure or a split structure. Specifically, in one embodiment, the current collecting member 10 is an integrated structure with a uniform thickness.

[0078] In a specific embodiment, the thickness C of the first connection portion 11, the second connection portion 12 and the bending portion 13 is greater than 0.2 mm and less than 0.5 mm, that is, 0.2 mm ≤ C ≤ 0.5 mm, such as 0.2 mm, 0.3 mm, etc. It is understandable that the thickness of the current collector 10 can be set according to different battery capacities.

[0079] The integrated structure and uniform thickness of the current collector 10 facilitate the manufacture of the current collector 10. Since the current collector 10 is relatively thin, it is not necessary to thin the first connection portion 11 or the second connection portion 12, and it can be directly welded to the electrode assembly 200 or the first electrode 20, which is simple in process, good in welding effect, and helps to reduce the overall weight of the battery.

[0080] In one specific embodiment, see Figure 2 The end cap assembly 100 further includes a pressing block 31, a first insulating member 32, and a second insulating member 34. The pressing block 31, the first insulating member 32, the cover plate 33, the second insulating member 34, and the current collector 10 are stacked in sequence. The first electrode 20 is sequentially disposed in the pressing block 31, the first insulating member 32, the cover plate 33, and the second insulating member 34.

[0081] The pressing block 31 , the first insulating member 32 , and the second insulating member 34 are respectively provided with openings 311 , 321 , and 341 at positions opposite to the first electrode 20 . The openings 311 , 321 , 341 and the mounting hole 331 are opposite to each other and are connected to each other for the first electrode 20 to pass through.

[0082] It should be noted that the apertures of the openings 311, 321, 341 and the mounting hole 331 may be of the same size or of different sizes. In this embodiment, the opening 321 of the first insulating member 32 and the opening 341 of the second insulating member are roughly adapted to the outer periphery of the poles 21, 22. A gap is formed between the mounting hole 331 and the first electrode 20 to avoid a short circuit.

[0083] In a specific embodiment, the first electrode 20 includes two poles 21 , 22 , and one end of the two poles 21 , 21 is welded to the second connecting portion 12 .

[0084] In the existing design, a pole is generally installed in the middle of the battery cover. In order to ensure the current conduction effect of the negative electrode, a pole with a larger volume is required. In order to avoid the pole, either a larger battery cover is selected, or the installation area of ​​other components such as the explosion-proof valve is sacrificed. In this application, the current is conducted through two poles 21 and 22, the overcurrent effect is good, and the volume of each pole 21 and 22 can be reduced, the internal space structure of the battery is optimized, and the battery is miniaturized.

[0085] It is understandable that in other embodiments, the number of poles 21 and 22 may also be set according to actual needs.

[0086] In a specific embodiment, the structure and size of the pole 21 and the pole 22 may be the same or different. In this embodiment, the specifications of the pole 21 and the pole 22 are consistent. The following is a specific description taking the pole 21 as an example.

[0087] In a specific embodiment, the pole 21 includes a top plate 211, a column 212 and a bottom plate 213. The radial lengths of the top plate 211 and the bottom plate 213 are greater than the column 212, so as to restrict the components such as the pressing block 31 between the top plate 211 and the bottom plate 213, thereby ensuring the stability of the overall structure of the end cap assembly 100 and the safety of the battery product.

[0088] In a specific embodiment, the radial length of the bottom plate 213 is greater than that of the top plate 211. This arrangement increases the area of ​​the bottom plate 213, expands the welding area between the first electrode 20 and the second connecting portion 12, and improves the current flow effect.

[0089] In a specific embodiment, the ends of the poles 21 and 22 are connected to the second connection portion 12 by penetration welding. Specifically, the poles 21 and 22 are welded by ultrasonic penetration welding, which has a better welding effect, expands the connection area between the two, and improves the current conduction effect.

[0090] In a specific embodiment, an explosion-proof valve hole 332 is provided on the cover plate 33. The explosion-proof valve hole 332 is used to discharge gas through the explosion-proof valve hole 332 when the gas pressure inside the battery exceeds a preset pressure, thereby relieving pressure and improving the safety of battery use.

[0091] Optionally, the explosion-proof valve hole 332 is formed in the middle of the cover plate 33, and the second insulating member 34 is provided with an isolating portion 342 at a position opposite to the explosion-proof valve hole 332. The explosion-proof valve hole 332 is roughly a waist-shaped hole, and the isolating portion 342 is hollowed out to form a plurality of through holes. The explosion-proof valve hole 332 and the through holes on the isolating portion 342 constitute a gas discharge channel. The provision of the isolating portion 342 prevents the bare aluminum sheet or the explosion-proof valve sheet (not shown) mounted thereon from contacting the current collecting member 10 and causing a short circuit. The explosion-proof valve hole 332 is opened in the middle of the cover plate 33, and the pressure relief speed is faster.

[0092] In a specific embodiment, one of the cover plate 33 and the second insulating member 34 is provided with a protrusion and the other with a groove, and both the protrusion and the groove are provided with injection holes. When the groove and the protrusion are plugged in, the injection holes of the cover plate 33 and the second insulating member 34 are aligned. Specifically, in this embodiment, the cover plate 33 is provided with a protrusion 333 protruding toward the second insulating member 34, and the second insulating member 34 is provided with a groove 343 plugged in with the protrusion 333. The protrusion 333 is provided with an injection hole 334, and the groove 343 is provided with an injection hole 344. By providing the protrusion 333 and the groove 343, the cover plate 33 and the second insulating member 34 can be installed in a counter-positioned manner to avoid mis-installation.

[0093] In a specific embodiment, the cover plate 33 is a metal part, for example, it can be a plain aluminum sheet. A second electrode 335 is also provided on the cover plate 33. The second electrode 335 is formed integrally with the cover plate 33 and is located on the other side of the explosion-proof valve hole 332 opposite to the first electrode 20. Thus, a structure is formed in which the explosion-proof valve hole 332 is in the middle, and the second electrode 335 and the first electrode 20 are respectively on both sides of the explosion-proof valve hole 332, which optimizes the internal space structure of the end cover assembly 100 and makes the layout more reasonable. The second electrode 335 and the first electrode 20 are separated by the explosion-proof valve hole 332 to avoid contact and improve safety. In addition, this arrangement enables the positive pole and the negative pole of the end cover assembly 100 to be located on the same side, which is convenient for the grouping of battery modules and the welding of conductive bars.

[0094] In a specific embodiment, the second electrode 335 is formed by the cover plate 33 protruding in a direction away from the second insulating member 34. The protruding structure of the cover plate 33 is used as the second electrode 335, and there is no need to add an additional pole structure, the structural stability is better, and the current flow effect of the second electrode 335 can be effectively improved.

[0095] In a specific embodiment, the second electrode 335, the pressing block 31 and the first insulating member 32 are all roughly fan-shaped, and the arcs of the three protrude toward the edge of the cover plate 33. The second electrode 335, the pressing block 31 and the first insulating member 32 are arranged to protrude outward, which can increase the surface area of ​​the second electrode 335 and the pressing block 31 and make full use of the space of the end cover assembly 100.

[0096] In a specific embodiment, the cover plate 33 is further provided with a fan-shaped groove 336, which is roughly symmetrically arranged with the second electrode 335 on both sides of the explosion-proof valve hole 332. The fan-shaped groove 336 is roughly adapted to the bottom profile of the pressing block 31, and the pressing block 31 is arranged in the fan-shaped groove 336, which effectively prevents the pressing block 31 from shifting and improves the stability of the overall structure of the product.

[0097] In a specific embodiment, the first insulating member 32 and the second insulating member 34 are both plastic members, for example, they may be made of injection-molded polymer materials, such as PP (polypropylene), PE (polyethylene), PTFE (polytetrafluoroethylene), etc. Optionally, the first insulating member 32 is provided with a rim 322 surrounding the circumference of the pressing block 31. The rim 322 isolates the circumference of the pressing block 31 to prevent other components from accidentally contacting the pressing block 31 during assembly.

[0098] The embodiment of the present application further provides an electrical device, which includes the battery described in the above embodiment.

[0099] Thus, in combination with the above, during the use of the battery of the present application, only one bending process is required for assembly, which simplifies the assembly process and effectively avoids the current collector from contacting the shell during assembly to cause a short circuit. The overall structure of the battery is simpler and lighter, and the service life is longer.

[0100] The embodiments of the present application also provide an electrical device, which may be an energy storage device, a vehicle, an electrical appliance, etc. A battery can be used alone in the electrical device, or multiple batteries can be assembled into a battery pack for use. Thus, in combination with the above, during the use of the electrical device of the present application, only one bending process is required during assembly, which simplifies the assembly process and effectively avoids short circuits caused by the current collector contacting the shell during assembly. The overall structure of the electrical device is more concise and lightweight, and has a longer service life.

[0101] In the application embodiments, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0102] In the description of the application embodiments, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the application embodiments.

[0103] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0104] The above are only preferred embodiments of the application embodiments and are not intended to limit the application embodiments. For those skilled in the art, the application embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application embodiments shall be included in the protection scope of the application embodiments.

Claims

1. An end cap assembly, characterized in that: include: A first electrode (20), the first electrode (20) comprising at least one pole (21, 22); A cover plate (33), wherein the cover plate (33) is formed with at least one mounting hole (331) penetrating along a thickness direction of the cover plate (33); A current collector (10) connected to the poles (21, 22), the current collector (10) comprising a first connection portion (11), a second connection portion (12) and a bending portion (13), the first connection portion (11) and the second connection portion (12) being connected via the bending portion (13), and when the current collector (10) is in a folded state, the current collector (10) is bent at the bending portion (13); A second electrode (335) is disposed on the cover plate (33) and is located on the other side opposite to the first electrode (20); Wherein, one end of the first electrode (20) passes through the mounting hole (331) and is connected to the second connecting portion (12) of the current collecting member (10).

2. The end cap assembly according to claim 1, characterized in that: The first electrode (20) comprises two poles (21, 22), the cover plate (33) is formed with two mounting holes (331) penetrating along the thickness direction of the cover plate (33), and one end of the two poles (21, 22) is welded to the second connecting portion (12).

3. The end cap assembly according to claim 1 or 2, characterized in that: An explosion-proof hole (332) is formed in the middle of the cover plate (33), and the first electrode (20) is arranged on one side of the explosion-proof hole (332).

4. The end cap assembly according to claim 3, characterized in that: The second electrode (335) is formed integrally with the cover plate (33) and is located on the other side of the explosion-proof hole (332) opposite to the first electrode (20).

5. The end cap assembly according to claim 4, characterized in that: The invention also comprises a pressing block (31), a first insulating member (32) and a second insulating member (34); the pressing block (31), the first insulating member (32), the cover plate (33), the second insulating member (34) and the current collecting member (10) are stacked in sequence; the first electrode is sequentially inserted through the pressing block (31), the first insulating member (32), the cover plate (33) and the second insulating member (34); and the second electrode (335) is formed by the cover plate (33) protruding in a direction away from the second insulating member (34).

6. The end cap assembly according to claim 5, characterized in that: The second electrode (335), the pressing block (31) and the first insulating member (32) are all fan-shaped, and arcs of the three protrude toward the edge of the cover plate (33).

7. The end cap assembly according to claim 5, characterized in that: One of the cover plate (33) and the second insulating member (34) is provided with a protrusion (333), and the other is provided with a groove (343). Both the protrusion (333) and the groove (343) are provided with injection holes. When the groove (343) and the protrusion (333) are plugged into each other, the injection holes of the cover plate (33) and the second insulating member (34) are aligned.

8. The end cap assembly according to claim 1, characterized in that: When the current collecting member (10) is in a folded state, the cross section of the current collecting member (10) along the thickness direction of the current collecting member (10) is arc-shaped.

9. The end cap assembly according to claim 8, characterized in that: At least one notch (131) is formed at the connection between the bending portion (13) and the second connecting portion (12) and / or the first connecting portion (11).

10. The end cap assembly according to claim 8, characterized in that: The first connecting portion (11), the second connecting portion (12) and the bending portion (13) are configured as an integrated structure and have the same thickness.

11. The end cap assembly according to claim 10, characterized in that: The thickness of the first connecting portion (11), the second connecting portion (12) and the bent portion (13) is greater than 0.2 mm and less than 0.5 mm.

12. The end cap assembly according to claim 8, characterized in that: The second connecting portion (12) is in the shape of a rectangular plate, the bent portion (13) is connected to one side of the second connecting portion (12) in the width direction, the first connecting portion (11) is in the shape of a disc, and the width of the second connecting portion (12) is less than or equal to two fifths of the diameter of the first connecting portion (11).

13. The end cap assembly according to claim 8, characterized in that: The outer arc length of the bending portion (13) is greater than or equal to 2.5 mm.

14. The end cap assembly according to any one of claims 8 to 13, characterized in that: The first connecting portion (11) is provided with an opening (111), and along the thickness direction of the first connecting portion (11), the orthographic projection of the second connecting portion (12) on the first connecting portion (11) does not overlap with the position of the opening (111).

15. A battery, characterized in that: include: A housing (201), wherein the housing (201) is provided with an opening; An electrode assembly (200) is contained in the housing (201); as well as The end cap assembly (100) according to any one of claims 1 to 14, wherein the cover plate (33) of the end cap assembly (100) closes the opening of the shell (201), one side of the cover plate (33) faces the interior of the shell (201), and the first connecting portion (11) of the current collecting member (10) is electrically connected to the electrode assembly (200).

16. An electrical equipment, characterized in that: Comprising the battery of claim 15.

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