Top cover, battery including same, and electronic device

Abstract

To provide an upper cover for a battery including an external conductive member, which effectively reduces the processing difficulty, the cost of raw materials, and the processing cost.SOLUTION: There are provided an upper cover, a battery including the same, and an electronic device. The upper cover 1 includes an upper cover plate, an electrode lead member 2, and an external conductive member 3. The electrode lead member and the external conductive member are electrically connected, and the external conductive member is disposed on one side of the upper cover plate away from an electrode assembly. The external conductive member includes a first metal layer 31 and a second metal layer 32. An insertion portion 311 protruding toward the second metal layer is disposed on the first metal layer. An engagement portion 321 engaging with the insertion portion is disposed on the second metal layer. The first metal layer and the second metal layer are engaged and connected via the insertion portion and the engagement portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to the field of batteries, and in particular to a top cover, a battery including the same, and an electronic device. [Background technology]

[0002] Currently, the upper cover of a prismatic battery typically has a butterfly welding assembly structure. An external conductive terminal is attached to the top surface of the upper cover plate, and an electrode post (electrode lead-out member) is attached to the bottom surface. The electrode post extends from a through-hole opened in the surface of the upper cover plate and is welded to the external conductive member. Currently, to ensure that the external conductive member attached to the upper cover plate is welded to the aluminum electrode post and the external copper wire at the same time, the external conductive terminal is usually made using a copper-aluminum composite plate or by friction welding a copper plate and an aluminum plate.

[0003] The solution of using copper-aluminum composite plates to fabricate external conductive components is costly in terms of raw materials, requires a complex process, has a low material utilization rate during fabrication, and also has a low copper plate utilization rate.The solution of fabricating external conductive components by friction welding copper and aluminum plates also requires a complex welding process and requires a lot of machining, resulting in a low material utilization rate and very high costs. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem that the present invention aims to solve is to overcome the drawbacks of the prior art that the manufacturing of the external conductive member involves many processing difficulties and high processing costs, and the technical solution is to provide an upper cover, a battery including the same, and an electronic device. [Means for solving the problem]

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The upper cover includes an upper cover plate, an electrode lead-out member, and an external conductive member. The electrode lead-out member is electrically connected to the external conductive member. The external conductive member is located on one side of the upper cover plate away from the electrode assembly. The external conductive member includes a first metal layer and a second metal layer. The first metal layer has an insert portion protruding toward the second metal layer. The second metal layer has an engaging portion engaging with the insert portion. The first metal layer and the second metal layer are engaged and connected via the insert portion and the engaging portion. By providing a protrusion on the first metal layer and a recess on the second metal layer that engages with the protrusion, the connection between the first metal layer and the second metal layer of the external conductive member is achieved by using the protrusion and recess that match and connect to each other. Compared to the prior art, the present invention effectively reduces processing difficulty, raw material costs, and processing costs while achieving the effect of connecting two metals. At the same time, this solution also makes it possible to achieve the connection effect between the first metal layer and the second metal layer using the same metal, while reducing the difficulty of processing, raw material costs, and processing costs.

[0007] Preferably, the insertion portion is a protrusion protruding from the first metal layer, and the engagement portion is a through-hole penetrating the second metal layer.

[0008] This structural arrangement can reduce the difficulty of engaging the insertion portion with the engaging portion, and at the same time, by forming the engaging portion as a through hole, the reliability of the resulting engaging structure is increased.

[0009] Preferably, the engagement portion is a stepped through hole including a first through hole and a second through hole. A projection of the first through hole is located within a projection area of ​​the second through hole along the insertion direction of the insertion portion. A peripheral surface of the insertion portion accommodated in the engagement portion matches the shape of the hole wall of the engagement portion.

[0010] By varying the cross-sectional shape of the stepped through hole of the engagement portion from small to large along the insertion direction of the insertion portion, the strength of the connection when fitted with the insertion portion can be improved.

[0011] Preferably, the cross-sectional size of the second through hole gradually changes from small to large along the insertion direction of the insertion portion, or the second through hole is a through hole whose cross-sectional size does not change.

[0012] By gradually changing the cross-sectional dimensions of the second through hole from small to large, it is convenient for the material at the end of the convex portion to better fill the concave portion when the convex portion and the concave portion are matched and connected through a material deformation process such as riveting or stamping, thereby improving the connection effect between the first metal layer and the second metal layer.

[0013] By designing the second through hole as a through hole with no change in cross-sectional dimension, a higher tensile strength is achieved when it is connected and matched with the convex part compared with other concave platform shapes, and the connection effect is better.

[0014] Preferably, along the insertion direction of the insert portion, the end of the insert portion is aligned with the penetration position of the engagement portion on the second metal layer, or along the insertion direction of the insert portion, the end of the insert portion is completely housed within the through-hole of the second metal layer, or along the insertion direction of the insert portion, the end of the insert portion protrudes from the through-hole of the second metal layer, and a dimension of at least a part of the end is larger than the diameter of the through-hole.

[0015] By aligning the terminal end of the insertion portion with the penetration position of the engagement portion, it is possible to easily engage and connect the first metal layer and the second metal layer, further simplifying the connection process.

[0016] By ensuring that the end of the insertion portion is completely housed within the through-hole of the second metal layer, the connection strength of the insertion portion to the engagement portion is improved.

[0017] By extending the end of the insert through the through-hole in the second metal layer and making at least a portion of the end larger than the diameter of the through-hole, the connection between the first and second metal layers is improved. At the same time, extending the insert allows a textured structure to be present on the surface of the second metal layer. When the external conductive member is subsequently wound and fixed by injection molding, the textured structure on the surface of the second metal layer is used to engage with the injection-molded insulating member, thereby achieving a more secure connection and preventing rotation of the external conductive member relative to the injection-molded insulating member.

[0018] Preferably, the upper cover further includes an insulating support portion having an accommodating cavity, and the second metal layer is at least partially accommodated within the accommodating cavity. A rotation prevention portion is provided on one side of the insulating support portion facing the second metal layer. The rotation prevention portion extends into the through-hole of the second metal layer to prevent rotation of the external conductive member relative to the insulating support portion. Alternatively, an end of the insertion portion extending from the through-hole of the second metal layer extends into the rotation prevention portion to prevent rotation of the external conductive member relative to the insulating support portion.

[0019] By extending the anti-rotation portion of the insulating support part into the through hole of the second metal layer, or by extending the end of the insertion part through the through hole of the second metal layer into the anti-rotation portion of the insulating support part, an engaging connection of the external conductive member to the insulating support part can be achieved, and rotation of the external conductive member relative to the insulating support part can be prevented.

[0020] Preferably, the first metal layer and the insert are integrally formed.

[0021] By integrally forming the first metal layer and the insertion portion, processing and molding can be facilitated, and this can improve the connection strength of the insertion portion relative to the engagement portion.

[0022] Preferably, the mounting portion is disposed on the first metal layer and includes a stepped through hole including a third through hole and a fourth through hole. The fourth through hole communicates with the engagement portion. A projection of the fourth through hole is located within a projection area of ​​the third through hole along the insertion direction of the insertion portion, and a peripheral surface of the insertion portion accommodated in the mounting portion engages with the shape of the hole wall of the mounting portion.

[0023] By disposing the mounting portion on the first metal layer, the insert portion is accommodated and restricted through the stepped through-hole, thereby providing a more favorable structural arrangement solution. By using the assembly and configuration of the insert portion relative to the mounting portion on the first metal layer, an engagement connection between the first metal portion and the second metal portion is further achieved. This structural arrangement also facilitates replacement of the insert portion relative to the first metal portion.

[0024] Preferably, the thickness of the first metal layer is greater than the thickness of the second metal layer, and / or along the insertion direction of the insert, the projection of the second metal layer is located within the projection area of ​​the first metal layer.

[0025] Since copper has a higher material density and is more expensive than aluminum, the material cost and weight of the external conductive member can be further reduced by making the thickness of the first metal layer made of aluminum thicker than the thickness of the second metal layer made of copper.

[0026] At the same time, by making the outer dimensions of the first metal layer made of aluminum larger than the outer dimensions of the second metal layer made of copper, the material cost and weight of the external conductive member can be further reduced.

[0027] Preferably, at least a part of the projected shape of the insert on the upper cover plate is any one of a circle, a square, a rectangle, a rhombus, and a trapezoid.

[0028] Making the insert part circular facilitates processing and molding, while making the insert part square, rectangular, diamond, or trapezoidal improves the strength of the engagement connection between the insert part and the engagement part.

[0029] Preferably, the end of the insert is provided with rounded corners.

[0030] In this way, processing is convenient, local stress during engagement and connection can be avoided, and the edge of the insertion portion can be prevented from damaging the surface of the other component when engaged and connected to the engagement portion.

[0031] Preferably, the upper cover includes an insulating support portion disposed between the second metal layer and the upper cover plate, the second metal layer being disposed between the insulating support portion and the first metal layer, a lead hole formed in the second metal layer, and an end of the electrode lead member having a lead portion that engages with the lead hole, and the second metal layer and the electrode lead member are engaged and connected via the lead hole and the lead portion.

[0032] By engaging and connecting the lead hole and the lead portion, the connection reliability of the second metal layer of the external conductive member to the electrode lead member is improved.

[0033] Preferably, a hollow portion is provided in the first metal layer at a position corresponding to the extraction hole of the second metal layer, and the dimension of the hollow portion is larger than the diameter of the extraction hole.

[0034] The first metal layer has a hollow space to prevent the second metal layer from connecting to the electrode lead member, facilitating the mating connection and subsequent welding process. At the same time, the hollow space in the first metal layer further reduces the weight.

[0035] Preferably, the diameter or side length of the projection of the insert on the upper cover plate is 0.5 mm to 6 mm, and the protruding height of the insert on the surface of the first metal layer is 0.2 mm to 4 mm.

[0036] Preferably, the first metal layer and the second metal layer are made of different materials, and the second metal layer and the electrode lead member are made of the same metal material.

[0037] Preferably, the first metal layer is made of aluminum, and the second metal layer is made of copper.

[0038] By making the first metal layer on which the insert is located out of aluminum and the second metal layer on which the engagement portion is located out of copper, and extending the aluminum insert into the copper engagement portion to engage and connect them, the overall weight of the external conductive member is reduced if the thicknesses of the first metal layer and the second metal layer remain unchanged, thereby reducing the weight and improving the energy density of the battery.

[0039] Preferably, the number of inserts is plural, and the plural inserts are uniformly distributed on the surface of the first metal layer.

[0040] The placement of multiple inserts improves the connection between the first and second metal layers, and the uniform distribution of the inserts on the surface of the first metal layer ensures uniformity of the connection between the first and second metal layers and avoids damage caused by localized forces.

[0041] Preferably, the first metal layer and the second metal layer are connected by welding.

[0042] The first and second metal layers of the external conductive member are further connected through a welding process based on the engagement between the insertion portion and the engagement portion, which further increases the contact area between the first and second metal layers, improves current-carrying capacity, and ensures connection reliability between the first and second metal layers.

[0043] Preferably, the first metal layer and the second metal layer are welded together in a brazing process.

[0044] The brazing process is cheaper than other welding processes. At the same time, the first metal layer and the second metal layer are engaged and connected via the insert and engaging portions, realizing pre-positioning of the first and second metal layers before welding, which also facilitates the subsequent brazing process and reduces the difficulty of brazing.

[0045] The battery includes a housing and the above-mentioned top cover. The top cover is placed on the housing and together with the housing defines a receiving cavity. The battery core is received in the receiving cavity, and the electrode assembly is connected to the battery core.

[0046] The electronic device includes the battery described above.

[0047] The advantages of the present invention are as follows. The present invention provides an upper cover, a battery including the same, and an electronic device. By arranging an insert on the first metal layer of the upper cover and an engaging portion that engages with the insert on the second metal layer, the connection between the first metal layer and the second metal layer of the external conductive member is realized by engaging the insert with the engaging portion. Compared to the prior art, the connection effect between the two metals is achieved while effectively reducing the difficulty of processing, raw material costs, and processing costs. [Brief explanation of the drawings]

[0048] [Figure 1] FIG. 1 is a schematic configuration diagram of an upper cover according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 3 is a partial enlarged view of part B in FIG. 2. [Figure 4] 1 is a schematic diagram showing an exploded structure of an external conductive member according to a first embodiment of the present invention. [Figure 5] FIG. 2 is a schematic diagram illustrating the configuration of a second metal layer according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a schematic view showing the internal structure of an external conductive member according to a second embodiment of the present invention. [Figure 7] FIG. 6 is a schematic diagram showing an exploded structure of an external conductive member according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a schematic view showing the internal structure of an external conductive member according to a third embodiment of the present invention. [Figure 9] FIG. 10 is a schematic diagram showing an exploded structure of an external conductive member according to a third embodiment of the present invention. [Figure 10]FIG. 10 is a schematic diagram illustrating the configuration of a second metal layer according to a third embodiment of the present invention. [Figure 11] FIG. 10 is a schematic diagram of an external conductive member and an upper injection-molded member according to a fourth embodiment of the present invention. [Figure 12] FIG. 10 is a schematic view showing the internal structure of an external conductive member according to a fifth embodiment of the present invention. [Figure 13] FIG. 10 is a schematic diagram showing an exploded structure of an external conductive member according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0049] A clearer and more complete description of preferred embodiments of the present invention will now be provided with reference to the accompanying drawings.

[0050] Embodiment 1

[0051] This embodiment provides an electronic device. The electronic device includes a battery. The battery includes a housing, an upper cover 100, and a battery core. The upper cover 100 covers the upper part of the housing and defines a housing cavity together with the housing. The battery core is housed in the housing cavity, and the battery core is connected to the electrode assembly and electrically connected to the electrode lead member 2 in the upper cover 100.

[0052] Examples of electronic devices include, but are not limited to, notebook computers, pen computers, mobile computers, e-book players, mobile phones, portable fax machines, portable copiers, portable printers, stereo headsets, video recorders, LCD televisions, portable vacuum cleaners, portable CD players, minidiscs, walkie-talkies, electronic notepads, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electrically assisted bicycles, bicycles, lighting equipment, toys, game consoles, watches, power tools, flashlights, cameras, large household batteries, energy storage or sodium ion capacitors, etc.

[0053] 1, 2, and 3 show an upper cover 100 of the present invention. The upper cover 100 specifically includes an upper cover plate 1, an electrode lead member 2, and an external conductive member 3. As shown in FIGS. 2 and 3, two sets of the electrode lead member 2 and the external conductive member 3 are installed on each upper cover plate 1, forming the positive and negative electrodes of the upper cover 100, respectively. As shown in FIG. 3, as an example of the position of the negative electrode of the upper cover 100, the electrode lead member 2 is Upper cover plate 1 The upper cover plate 1 is electrically connected to the external conductive member 3 by passing through the upper cover plate 1 from bottom to top. At the same time, the external conductive member 3 is installed on the upper surface of the upper cover plate 1, and the external conductive member 3 and the upper cover plate 1 are separated and insulated by the upper injection-molded member 4. A concave receiving cavity that partially receives the external conductive member 3 is installed on the upper surface of the upper injection-molded member 4, ensuring a reliable connection with the external conductive member 3. The electrode lead member 2 and the upper cover plate 1 are separated and insulated by the lower injection-molded member 5. In this embodiment, the upper injection-molded member 4 for insulating the external conductive member 3 from the upper cover plate 1 and the lower injection-molded member 5 for insulating the electrode lead member 2 from the upper cover plate 1 are both formed by injection molding. Of course, in other embodiments, other processes such as pretreatment or molding may be used to form an insulating support structure that separates the external conductive member 3 from the upper cover plate 1 and the electrode lead member 2 from the upper cover plate 1, thereby achieving the purposes of support connection and insulation.

[0054] 3 and 4, the external conductive member 3 in this embodiment includes a laminated first metal layer 31 and a second metal layer 32. The first metal layer 31 is made of aluminum, and the second metal layer 32 is made of copper, and is provided for welding to the electrode lead member 2, which is also made of copper. An insertion portion 311 that protrudes toward the second metal layer 32 is provided on the surface of the first metal layer 31, and an engagement portion 321 that engages with the insertion portion 311 is provided on the surface of the second metal layer 32. The first metal layer 31 and the second metal layer 32 are engaged and connected via the insertion portion 311 and the engagement portion 321, thereby realizing connection and contact between the two metal materials.

[0055] In this solution, an insert portion 311 is disposed on the first metal layer 31, and an engaging portion 321 that engages with the insert portion 311 is disposed on the second metal layer 32, thereby engaging and connecting the insert portion 311 and the engaging portion 321, thereby realizing a connection between the first metal layer 31 and the second metal layer 32 of the external conductive member 3. Compared to the prior art, the connection effect between two metals can be achieved while effectively reducing the difficulty of processing, the cost of raw materials, and the cost of processing.

[0056] In this embodiment, the first metal layer 31 is made of aluminum and the second metal layer 32 is made of copper, but this is merely a specific example protected by the present invention. In other embodiments, the first metal layer 31 and the second metal layer 32 may be made of different metals as needed, and the purpose of easy connection may be achieved by engaging the insertion portion 311 and the engagement portion 321. In this embodiment, the insertion portion 311 is disposed on the first metal layer 31 made of aluminum, and the engagement portion 321 is disposed on the second metal layer 32 made of copper. Because the density of aluminum is lower than that of copper, the aluminum insertion portion 311 can be inserted into the copper engagement portion 321 to achieve engagement and connection. If the thicknesses of the first metal layer 31 and the second metal layer 32 remain the same, replacing part of the external conductive member 3 from copper with aluminum reduces the overall weight of the external conductive member 3, thereby reducing the weight of the battery and improving its energy density.

[0057] Furthermore, in order to reduce weight and cost, in this embodiment, the thickness of the first metal layer 31 made of aluminum is thicker than the thickness of the second metal layer 32 made of copper, and the diameter of the first metal layer 31 is larger than the diameter of the second metal layer 32, thereby reducing weight and cost.

[0058] Of course, in other embodiments, the solution of achieving a low-cost and reliable connection through the cooperation of the insertion portion 311 and the engagement portion 321 can also be used to connect the first metal layer 31 and the second metal layer 32 made of the same material.

[0059] In this embodiment, the first metal layer 31 and the second metal layer 32 are connected by riveting the insertion portion 311 and the connection hole. Compared to other engagement connection processes, the riveting process has a simpler structure and lower processing costs, thereby further reducing the manufacturing cost of the external conductive member 3. Furthermore, to improve the reliability of the external conductive member 3 during use, the first metal layer 31 and the second metal layer 32 are welded based on the engagement connection between the first metal layer 31 and the second metal layer 32. This further increases the contact area between the first metal layer 31 and the second metal layer 32 and improves the current-carrying capacity. At the same time, the connection reliability between the first metal layer 31 and the second metal layer 32 is ensured. In this embodiment, because the first metal layer 31 and the second metal layer 32 are connected by engagement connection before welding, the main function of the welding process is to strengthen the connection between the two metal layers, increase the contact area between the two metal layers, and improve the current-carrying capacity. This objective can be achieved by relatively low-cost brazing. Specifically, before the first metal layer 31 and the second metal layer 32 are engaged and connected, solder is applied to the corresponding surfaces of the first metal layer 31 and the second metal layer 32. Then, the first metal layer 31 and the second metal layer 32 are engaged and connected via the insertion portion 311 and the engagement portion 321, and then soldering is performed to increase the connection strength and contact area between the first metal layer 31 and the second metal layer 32. Here, solder may be applied to the insertion portion 311 and the engagement portion 321 to further increase the contact area after welding.

[0060] 3 and 4, in this embodiment, the engaging portion 321 penetrates the second metal layer 32 from top to bottom, and more specifically, penetrates the through hole of the second metal layer 32 along the insertion direction C of the insertion portion 311. This structural arrangement can improve the reliability of the formed engaging structure. Based on the above, as can be seen from FIG. 3, the engaging portion 321 is a through hole whose cross-sectional shape increases from small to large along the insertion direction C of the insertion portion 311, and the circumferential surface of the insertion portion 311 engages with the shape of the hole wall of the engaging portion 321, further improving the connection strength when engaged with the insertion portion 311.

[0061] As shown in FIG. 5 , in this embodiment, the engagement portion 321 is a stepped through hole including a first through hole 3211 and a second through hole 3212 along the insertion direction C of the insertion portion 311. The first through hole 3211 and the second through hole 3212 have different diameters, and the projection of the first through hole 3211 is located within the projection area of ​​the second through hole 3212, thereby forming a gap in the hole wall of the stepped through hole into which the insertion portion 311 is embedded, thereby improving the adhesion between the insertion portion 311 and the engagement portion 321. In this way, even if an external force is applied to the first metal layer 31, the first metal layer 31 is less likely to peel off from the second metal layer 32. Specifically, the second through hole 3212, located at the bottom end of the engagement portion 321, is a concave platform with a uniform cross section. This structural arrangement can achieve stronger tensile strength and better connection effect when engaging and connecting with the insert 311 compared to other concave platform shapes.

[0062] 3 and 4, in this embodiment, the insertion portion 311 extends from top to bottom within the through-hole of the engagement portion 321, and the lower end of the insertion portion 311 is aligned with the penetration position of the engagement portion 321 on the second metal layer 32. This structural arrangement facilitates engagement and positioning of the insertion portion 311 and the engagement portion 321, and further simplifies the connection process when engaging and connecting the first metal layer 31 and the second metal layer 32.

[0063] As shown in FIG. 4 , in this embodiment, four inserts 311 are provided on the first metal layer 31. These inserts 311 are uniformly distributed circumferentially on the surface of the first metal layer 31, and four corresponding engagement portions 321 are provided on the second metal layer 32 to accommodate the inserts 311. The arrangement of the multiple inserts 311 and the engagement portions 321 for engagement and connection can improve the connection between the first metal layer 31 and the second metal layer 32. Furthermore, the uniform distribution of the inserts 311 on the surface of the first metal layer 31 can ensure uniformity in the connection between the first metal layer 31 and the second metal layer 32 and prevent damage due to local stress. Of course, in other embodiments, the number of inserts 311 provided on the first metal layer 31 can be different to improve the engagement and connection between the multiple inserts 311 and the second metal layer 32.

[0064] 4, the projection shape of the insert 311 on the upper cover plate 1 is circular to facilitate processing and molding and to avoid local stress when engaging with the engaging portion 321. At the same time, the arc-shaped edge of the insert 311 can also prevent scratches on the surfaces of other components.

[0065] The projection diameter R of the insertion portion 311 on the upper cover plate 1 is preferably 0.5 mm to 6 mm. The selection range of the diameter R is more preferably 1 mm to 3 mm. If the diameter R is 1 mm or more, the connection effect can be ensured, and if the diameter R is 3 mm or less, the diameter of the insertion portion 311 does not become too large and affect the processing of the component. Furthermore, the protrusion height H of the insertion portion 311 on the surface of the first metal layer 31 is preferably 0.2 mm to 4 mm. The selection range of the protrusion height H is more preferably 0.5 mm to 2 mm. By setting the protrusion height H to 0.5 mm or more, the connection effect can be ensured, and if the protrusion height H is 2 mm or less, the insertion portion 311 does not protrude too much and affect the processing of the component.

[0066] Of course, in other embodiments, the projection shape of the insert 311 on the upper cover plate 1 is any one of polygons such as a square, rectangle, rhombus, trapezoid, etc., or a combination of these polygons. Based on this, an angle R can be set at the edge of the insert 311 to avoid scratching the surface of other components. When the insert 311 is a polygon such as a square, rectangle, rhombus, trapezoid, etc., the preferred value of the length of one side of the insert 311 is 0.5 mm to 6 mm. The selection range of the length of one side of the insert 311 is more preferably 1 mm to 3 mm.

[0067] As shown in FIG. 3 , in this embodiment, a lead hole 322 is formed on the surface of the second metal layer 32. The upper portion of the electrode lead member 2 protrudes upward, and a lead portion 21 that engages with the lead hole 322 is formed at the end. Therefore, the second metal layer 32 and the electrode lead member 2 are engaged and connected via the lead hole 322 and the lead portion 21. This structural arrangement increases the contact area between the second metal layer 32 of the external conductive member 3 and the electrode lead member 2, enabling pre-positioning before welding and ensuring a reliable connection between them. Furthermore, a hollow portion 312 is formed in the first metal layer 31 at a position corresponding to the lead hole 322 of the second metal layer 32. The dimensions of the hollow portion 312 are larger than the diameter of the lead hole 322 to avoid contact between the second metal layer 32 and the electrode lead member 2 and facilitate engagement and connection as well as subsequent welding processes. At the same time, the hollow portion 312 in the first metal layer 31 further reduces weight. In this embodiment, since the extraction hole 322 is a circular hole, the hollow portion 312 is also configured as a circular hole coaxial with the extraction hole 322. To ensure the avoidance effect, the diameter of the hollow portion 312 is larger than the diameter of the extraction hole 322.

[0068] Embodiment 2

[0069] 6 and 7 are schematic diagrams of an external conductive member 3 according to embodiment 2 of the present invention. Since the structure of the external conductive member 3 in this embodiment is almost the same as that in embodiment 1, only the differences in the structure from the external conductive member 3 in embodiment 1 will be described in detail in this embodiment.

[0070] Specifically, as shown in FIGS. 6 and 7 , in this embodiment, the engagement portion 321 provided on the second metal layer 32 is also a through-hole penetrating vertically, except that the through-hole in this embodiment is a straight through-hole rather than the stepped hole of the first embodiment. Based on this, the insertion portion 311 on the first metal layer 31 extends into the corresponding engagement portion 321 and then further extends from the penetration position of the engagement portion 321 on the second metal layer 32, so that the end of the insertion portion 311 protrudes from the surface of the second metal layer 32. This structural arrangement can improve the connection between the first metal layer 31 and the second metal layer 32. At the same time, by having the insertion portion 311 extend from the surface of the second metal layer 32, a concave-convex structure can be present on the surface of the second metal layer 32. When the external conductive member 3 is then wound and fixed by injection molding, the uneven structure on the surface of the second metal layer 32 is used to engage with the injection-molded insulating portion, thereby achieving a more secure connection and preventing rotation of the external conductive member 3 relative to the injection-molded insulating portion.

[0071] Furthermore, the diameter of the portion of the insertion portion 311 that protrudes from the surface of the second metal layer 32 is larger than the diameter of the through hole of the engagement portion 321. This configuration improves the ability to regulate the position of the insertion portion 311 and the engagement portion 321. In order to make the diameter of the insertion portion 311 that protrudes from the second metal layer 32 larger than the diameter of the through hole of the engagement portion 321, the engagement and connection process between them can be achieved by riveting, stamping, or the like.

[0072] Embodiment 3

[0073] 8 and 9 are schematic diagrams of an external conductive member 3 according to a third embodiment of the present invention. Since the structure of the external conductive member 3 in this embodiment is almost the same as that in the first embodiment, only the differences in the structure from the external conductive member 3 in the first embodiment will be described in detail.

[0074] Specifically, as shown in FIGS. 8 and 9, in this embodiment, the engagement portion 321 installed on the second metal layer 32 is also a through-hole that penetrates vertically, and is a stepped through-hole consisting of a first through-hole 3211 and a second through-hole 3212. The difference between this embodiment and embodiment 1 is that, as shown in FIG. 10, the second through-hole 3212 located at the bottom of the engagement portion 321 has a variable cross-section. The variable cross-section concave platform has a trumpet-like shape along the insertion direction C of the insertion portion 311, and its cross-sectional shape gradually changes from small to large. This structural arrangement allows the material at the end of the insertion portion 311 to more effectively fill the end of the trumpet-shaped engagement portion 321 when the insertion portion 311 and the engagement portion 321 are engaged and connected through a material deformation process such as riveting or stamping, thereby improving the connection between the first metal layer 31 and the second metal layer 32.

[0075] Embodiment 4

[0076] 11 is a schematic diagram of an external conductive member 3 according to embodiment 4 of the present invention. Since the structure of the external conductive member 3 in this embodiment is almost the same as that in embodiment 1, only the differences in the structure from the external conductive member 3 in embodiment 1 will be described in detail in this embodiment.

[0077] 11 , in this embodiment, the engagement portion 321 on the second metal layer 32 is also a through-hole that penetrates vertically, and the insertion portion 311 on the first metal layer 31 does not completely protrude from the engagement portion 321, resulting in a recess on the underside of the second metal layer 32. Therefore, a corresponding anti-rotation portion 41 is provided on the surface of the upper injection-molded member 4 that faces the second metal layer 32. By extending the anti-rotation portion 41 to the engagement portion 321 of the second metal layer 32, the connection and positioning between the upper injection-molded member 4 and the second metal layer 32 are improved, and rotation of the external conductive member 3 relative to the upper injection-molded member 4 can be more effectively prevented.

[0078] Of course, in other embodiments, the anti-rotation portion 41 located on the upper injection-molded part 4 may have a concave recessed structure. In this case, the engagement between the insert 311 and the anti-rotation portion 41 allows the insert 311 on the first metal layer 31 to protrude from the surface of the second metal layer 32, thereby preventing the external conductive member 3 from rotating relative to the upper injection-molded part 4.

[0079] Embodiment 5

[0080] 12 and 13 are schematic diagrams of an external conductive member 3 according to embodiment 5 of the present invention. Since the structure of the external conductive member 3 in this embodiment is almost the same as that in embodiment 1, only the differences in the structure from the external conductive member 3 in embodiment 1 will be described in detail in this embodiment.

[0081] Specifically, as shown in FIGS. 12 and 13 , in this embodiment, the first metal layer 31 and the insertion portion 311 are not integrally formed, but have a relatively coupled connection relationship. Specifically, as shown in FIG. 12 , a mounting portion 313 is provided on the first metal layer 31, penetrating vertically to accommodate the insertion portion 311. In this embodiment, the mounting portion 313 is specifically a stepped through-hole including a third through-hole 3131 and a fourth through-hole 3132. The fourth through-hole 3132 communicates with the third through-hole 3131. The projection of the fourth through-hole 3132 along the insertion direction of the insertion portion 311 is located within the projection area of ​​the third through-hole 3131. Therefore, after the insertion portion 311 is positioned downward up to the mounting portion 313, the position of the insertion portion 311 is restricted downward via the mounting portion 313, thereby preventing the insertion portion 311 from continuing to move downward.

[0082] 13, the first metal layer 31 is then placed downward onto the second metal layer 32 and riveted to the engaging portion 321 of the second metal layer 32 via the inserting portion 311. This causes the inserting portion 311 and the second metal layer 32 to engage and connect, ensuring a reliable connection between the first metal layer 31 and the second metal layer 32 via the inserting portion 311, which is independent of the first metal layer 31.

[0083] This structural arrangement makes it easy to disassemble, assemble, and replace the insertion portion 311, and there is no need to reprocess the first metal layer 31 when replacing the insertion portion 311, thereby improving the versatility and maintainability of the structure.

[0084] Although specific embodiments of the present invention have been described above, those skilled in the art can understand that these are merely examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, and all of these changes and modifications will fall within the protection scope of the present invention. [Industrial Applicability]

[0085] The top cover, battery and electronic device of the present invention can be applied in the field of battery technology. [Explanation of symbols]

[0086] 1: Top cover board 2: Electrode lead member 3: External conductive material 4: Upper injection molding part 5: Lower injection molding part 21: Drawer part 31: First metal layer 32: Second metal layer 311: Insertion section 312: Hollow part 321: Engagement part 322: Extraction hole 41: Anti-rotation part 3131: Third Through Hole 3132: Fourth Through-hole 3211: First through hole 3212: Second through hole

Claims

1. an upper cover plate, an electrode lead member, and an external conductive member; the electrode lead-out member is electrically connected to the external conductive member, the external conductive member being installed on one side of the upper cover plate away from the electrode assembly, the external conductive member including a first metal layer and a second metal layer, an insertion portion protruding toward the second metal layer being installed on the first metal layer, and an engagement portion engaging with the insertion portion being installed on the second metal layer, the first metal layer and the second metal layer being engaged and connected via the insertion portion and the engagement portion; The upper cover, wherein the insertion portion is a protrusion protruding from the first metal layer, and the engagement portion is a through-hole penetrating the second metal layer.

2. the engaging portion is a stepped through hole including a first through hole and a second through hole, 2. The upper cover according to claim 1, wherein along the insertion direction of the insertion portion, the projection of the first through hole is located within the projection area of ​​the second through hole, and the peripheral surface of the insertion portion accommodated in the engagement portion engages with the shape of the hole wall of the engagement portion.

3. The cross-sectional size of the second through hole gradually changes from small to large along the insertion direction of the insertion portion, or The upper cover according to claim 2 , wherein the second through-hole is a through-hole whose cross-sectional dimensions do not change.

4. 2. The upper cover according to claim 1, wherein along the insertion direction of the insertion portion, an end of the insertion portion is aligned with the penetration position of the engagement portion on the second metal layer, is completely housed within the through hole of the second metal layer, or protrudes from the through hole of the second metal layer, and a dimension of at least a portion of the end is larger than the diameter of the through hole.

5. the top cover further includes an insulating support portion, the insulating support portion having a receiving cavity, the second metal layer being at least partially received within the receiving cavity; a rotation prevention portion is provided on one side of the insulating support portion facing the second metal layer; 5. The upper cover of claim 4, wherein the anti-rotation portion extends into the through hole of the second metal layer, or the end of the insertion portion extending from the through hole of the second metal layer extends into the anti-rotation portion, thereby preventing rotation of the external conductive member relative to the insulating support portion.

6. The top cover of claim 1 , wherein the first metal layer and the insert are integrally formed.

7. 3. The upper cover of claim 2, wherein an attachment portion is provided on the first metal layer, the attachment portion includes a stepped through hole including a third through hole and a fourth through hole, the fourth through hole communicates with the engagement portion, the projection of the fourth through hole is located within the projection area of ​​the third through hole along the insertion direction of the insertion portion, and the peripheral surface of the insertion portion accommodated in the attachment portion engages with the shape of the hole wall of the attachment portion.

8. The top cover of claim 1 , wherein the thickness of the first metal layer is greater than the thickness of the second metal layer.

9. The top cover according to claim 1 , wherein a projection of the second metal layer is located within a projection area of ​​the first metal layer along an insertion direction of the insert portion.

10. The upper cover according to claim 1 , wherein at least a part of the projected shape of the insertion portion on the upper cover plate is any one of a circle, a square, a rectangle, a rhombus, and a trapezoid.

11. The top cover of claim 8 , wherein the edges of the insert are provided with rounded corners.

12. the upper cover further includes an insulating support disposed between the second metal layer and the upper cover plate, the second metal layer being disposed between the insulating support and the first metal layer; 2. The upper cover according to claim 1, wherein an extraction hole is provided on the second metal layer, an end of the electrode extraction member has an extraction portion that engages with the extraction hole, and the second metal layer and the electrode extraction member are engaged and connected via the extraction hole and the extraction portion.

13. The upper cover according to claim 12 , wherein a hollow portion is provided in the first metal layer at a position corresponding to the extraction hole in the second metal layer, and the dimension of the hollow portion is larger than the diameter of the extraction hole.

14. An upper cover as described in any one of claims 1 to 5 and 8 to 13, wherein the diameter or side length of the projection of the insert on the upper cover plate is 0.5 mm to 6 mm, and the protruding height of the insert above the surface of the first metal layer is 0.2 mm to 4 mm.

15. 14. The upper cover according to claim 1, wherein the first metal layer and the second metal layer are made of different materials, and the second metal layer and the electrode lead member are made of the same material.

16. 16. The top cover of claim 15, wherein the material of the first metal layer is aluminum and the material of the second metal layer is copper.

17. 14. The top cover according to claim 1, wherein the number of inserts is plural, and the plural inserts are uniformly distributed on the surface of the first metal layer.

18. the first metal layer and the second metal layer are connected by welding; 14. The upper cover according to any one of claims 1 to 5 and 8 to 13.

19. 20. The top cover of claim 18, wherein the first metal layer and the second metal layer are welded together in a brazing process.

20. The housing and 14. A top cover according to any one of claims 1 to 5 and 8 to 13, the top cover being placed on the housing and defining a receiving cavity together with the housing; a battery core accommodated in the accommodation cavity and connected to an electrode assembly; A battery comprising:

21. An electronic device comprising the battery according to claim 20.

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