Battery end caps, batteries, battery packs and electrical equipment

Abstract

This application relates to a battery end cap, a battery, a battery pack, and an electrical device. The battery end cap includes an end plate, a current collector, and terminals. The current collector is disposed on one side of the end plate, and a connecting block is provided on the current collector. The terminals penetrate the end plate along its thickness direction, with both ends of the terminals extending outwards from the sides of the end plate along its thickness direction. The end of the terminal closest to the current collector is welded to the connecting block via through-welding. Through-welding allows the current collector and terminals to be directly connected. The current collector no longer needs to be bent, reducing the processing step required for bending the current collector, facilitating its manufacturing, and without increasing the space occupied by the current collector. It also facilitates the assembly of the cylindrical battery end.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a battery end cap, a battery, a battery pack, and an electrical device. Background Technology

[0002] Cylindrical batteries typically have a cover plate, a current collector, and terminals at their ends. The cover plate seals the battery casing, and the terminals are mounted on the cover plate. The terminals are electrically connected to the current collector, and current is conducted through the current collector to the terminals for output to an external circuit. In related technologies, the terminals and current collector usually need to be welded to achieve the electrical connection. Therefore, during the assembly of the cylindrical battery ends, the current collector needs to be bent away from the terminals to ensure that there is sufficient space between the terminals and the current collector for welding operations. However, the bent current collector is relatively large, requiring higher machining precision. Furthermore, it adds an extra machining step to bend the current collector, which is also inconvenient for current collector production. Utility Model Content

[0003] The purpose of this application is to provide a battery end cap, battery, battery pack, and electrical equipment that eliminates the need for bending during installation of the current collector, reduces the size of the current collector, and facilitates its production and installation.

[0004] To achieve the above objectives, in a first aspect, this application provides a battery end cap, comprising:

[0005] End plate;

[0006] A collector plate is disposed on one side of the end plate; and

[0007] The electrode post is inserted through the end plate along the thickness direction of the end plate. The two ends of the electrode post extend out of the two sides of the end plate in the thickness direction of the end plate, respectively. The end of the electrode post near the collector plate is welded to the collector plate by through welding.

[0008] As an optional implementation, the collector plate is provided with a connecting block, and the end of the pole near the collector plate is welded to the connecting block by penetration welding. The material of the connecting block is the same as that of the pole. When the collector plate and the pole are made of different materials, the collector plate can be connected to the connecting block first, and then the connecting block and the pole can be connected by penetration welding. Since the connecting block and the pole are made of the same material, the connecting block and the pole expand at the same rate when heated, ensuring the welding strength between the connecting block and the pole and preventing the weld from deforming, cracking, or even breaking after penetration welding.

[0009] As an optional implementation, a first blind hole is provided on the end face of the pole away from the collector plate. The bottom of the first blind hole is configured to form a thinning hole when the pole is welded to the connecting block. The distance between the bottom of the first blind hole and the connecting block is smaller than the distance between the end face of the pole away from the collector plate and the connecting block. In this way, when the bottom of the first blind hole serves as a thinning hole when the pole is welded to the connecting block, the heat source can penetrate the pole more easily, ensuring the welding effect between the connecting block and the pole.

[0010] As an optional implementation, the end plate is provided with a mounting hole extending along the thickness direction of the end plate, and the pole post includes a first column and a second column.

[0011] One end of the first column is housed within the mounting hole, and the other end extends outside the mounting hole. One end of the second column is housed within the mounting hole and abuts against one end of the first column, while the other end extends outside the mounting hole for welding to the connecting block. The maximum radial dimension of at least one of the first and second columns is greater than the diameter of the mounting hole. This design of the first and second columns allows the electrode post to be constructed as a split structure. During assembly, a single damaged first or second electrode post can be replaced independently without scrapping the entire electrode post. Furthermore, the fact that the maximum radial dimension of at least one of the first and second columns is greater than the diameter of the mounting hole enables the connection between the end plate and the electrode post, further facilitating electrode post assembly. Additionally, the axial splicing of the first and second columns disperses external loads, such as battery cycle expansion forces or vibration impacts, to two independent components, reducing the risk of overall electrode post breakage and extending service life.

[0012] As an optional implementation, the first column has a through hole extending along the axial direction of the electrode post, and the second column has a second blind hole. The second blind hole is located on the end face of the second column facing the first column and extends along the axial direction of the electrode post. The through hole and the second blind hole are interconnected and together form the first blind hole. Thus, in the separate construction of the electrode post, the bottom of the second blind hole becomes the bottom of the first blind hole. In this case, the bottom of the second blind hole can form a thinning hole when welding the electrode post to the connecting block, ensuring the connection between the electrode post and the connecting block. Simultaneously, having holes on both columns can minimize the weight of the electrode post, thereby reducing the weight of the battery end cap.

[0013] As an optional implementation, the first column has a first protrusion on its outer peripheral surface extending beyond the mounting hole, and the second column has a second protrusion on its outer peripheral surface extending beyond the mounting hole. The first and second protrusions extend radially along the pole post and abut against the end plate. In this way, the two protrusions can limit the pole post axially, achieving a clamping effect to hold the end plate and fix the first and second columns, preventing the pole post from wobbling circumferentially and ensuring its stability.

[0014] As an optional implementation, the battery end cap further includes a first insulating member and a second insulating member. The first insulating member is sleeved on the first post and extends between the first boss and the end plate, providing insulation between the first post and the end plate. The second insulating member is sleeved on the second post and extends between the second boss and the end plate, providing insulation between the second post and the end plate. Thus, the first insulating member ensures insulation between the first post and the first boss and the end plate, and the second insulating member ensures insulation between the second post and the second boss and the end plate. This ensures that the posts and bosses do not have electrical connection with the end plate. When the battery end cap is used in a battery, it can prevent short circuits and improve battery safety, reliability, and lifespan.

[0015] As an optional implementation, a positioning groove is formed on the end face of the pole facing the collector plate, and the connecting block is configured to be disposed within the positioning groove when the connecting block is connected to the pole. The bottom of the positioning groove can abut against the surface of the connecting block to ensure electrical connection between the connecting block and the pole. The wall of the positioning groove can also abut against the surface of the connecting block. In this case, the wall of the positioning groove can limit the surface of the connecting block, preventing displacement and shaking of the connecting block. At the same time, when the connecting block is connected to the pole, the positioning groove can prevent the connection position of the connecting block from shifting.

[0016] As an optional implementation, the battery end cap further includes a third insulating member disposed on the surface of the end plate facing the current collector. The third insulating member serves to insulate the end plate and the current collector. This third insulating member ensures insulation between the end plate and the current collector, preventing electrical connection between them. When the battery end cap is used in a battery, it can prevent short circuits and improve battery safety, reliability, and lifespan.

[0017] Secondly, this application also discloses a battery, said battery including a battery end cap as described in any of the preceding claims.

[0018] Thirdly, this application also discloses a battery pack including at least one battery as described above.

[0019] Fourthly, this application also discloses an electrical device including a battery pack as described above, the battery pack being used to supply power to the electrical device.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] The battery end cap of this application connects the current collector and the terminal post through penetration welding. Penetration welding penetrates the terminal post, causing a localized structure of the current collector to absorb energy and melt, thus achieving the connection between the current collector and the terminal post. In this way, when the current collector is connected to the terminal post after being connected to the tab, the penetration welding allows the operator to efficiently utilize the space on the side of the terminal post furthest from the current collector, i.e., the side of the end plate opposite the current collector, to achieve the connection between the terminal post and the current collector. The current collector no longer needs to be bent, as in existing technologies, to create an operating space for welding between the terminal post and the current collector. In other words, penetration welding allows for a direct connection between the current collector and the terminal post. Eliminating the need for bending the current collector reduces this processing step, facilitating the manufacturing of the current collector, without increasing its space requirements, and also making it easier to assemble the cylindrical battery end. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the battery end cap disclosed in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of the battery end cap after being cut open along the AA direction, as disclosed in the embodiments of this application;

[0025] Figure 3 yes Figure 1 A schematic diagram of the AA cross-section of the battery end cap;

[0026] Figure 4 yes Figure 2 Enlarged view of section B;

[0027] Figure 5 This is a schematic diagram of the battery structure disclosed in the embodiments of this application;

[0028] Figure 6This is a schematic diagram of the battery pack structure disclosed in the embodiments of this application;

[0029] Figure 7 This is a schematic diagram of the structure of the electrical equipment disclosed in the embodiments of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Battery end cap; 11-End plate; 111-Mounting hole; 12-Collector; 121-Connecting block; 13-Terminal post; 131-First blind hole; 132-First column; 1321-Through hole; 1322-First boss; 1323-Third blind hole; 133-Second column; 1331-Second blind hole; 1332-Second boss; 134-Positioning groove; 14-First insulating component; 15-Second insulating component; 16-Third insulating component; 2-Housing shell; 100-Battery; 200-Battery pack; 300-Electrical equipment; 310-Power conversion device; 320-Electrical load. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0033] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0034] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0036] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0037] Cylindrical batteries typically have a cover, current collector, and terminals at their ends. The cover seals the battery casing, the terminals are mounted on the cover and electrically connected to the current collector, and the tabs of the battery cell are connected to the current collector. Current is conducted through the current collector to the terminals for output to the external circuit. During assembly, the tabs of the battery cell are first welded to the current collector, and then the current collector is welded to the terminals. When welding the current collector to the terminals, the operator's working space is limited because the tabs are already connected. Therefore, the current collector needs to be bent away from the terminals to create sufficient space for welding. In other words, the assembly of the cylindrical battery ends adds a bending step to the current collector. Bending the current collector requires high machining precision, which is inconvenient for current collector production. Furthermore, the bent current collector occupies a larger space, further hindering the assembly of the cylindrical battery ends.

[0038] In view of this, this application provides a battery end cap, a battery, a battery pack, and an electrical device, which connects the current collector and the terminal post through penetration welding. Penetration welding penetrates the terminal post, causing a localized structure of the current collector to absorb energy and melt, thus achieving the connection between the current collector and the terminal post. In this way, when the current collector is connected to the terminal post after being connected to the tab, the penetration welding allows the operator to efficiently utilize the space on the side of the terminal post furthest from the current collector, i.e., the side of the end plate opposite to the current collector, to achieve the connection between the terminal post and the current collector. The current collector no longer needs to be bent as in existing technologies to create an operating space for welding operations between the terminal post and the current collector. In other words, penetration welding allows the current collector and the terminal post to be directly connected. The current collector no longer needs to be bent, reducing this processing step, facilitating the manufacturing of the current collector, and does not increase the space occupied by the current collector. It also facilitates the assembly of the cylindrical battery end.

[0039] The following will describe the scheme of this application in detail with reference to the accompanying drawings.

[0040] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the battery end cover 1 disclosed in an embodiment of this application. This application discloses a battery end cover 1, including an end plate 11, a current collector 12, and a terminal post 13: the current collector 12 is disposed on one side of the end plate 11; the terminal post 13 passes through the end plate 11 along the thickness direction of the end plate 11, and the two ends of the terminal post 13 extend out of the two sides of the end plate 11 in the thickness direction of the end plate 11, respectively, and the end of the terminal post 13 near the current collector 12 is welded to the current collector 12 by through welding.

[0041] Penetration welding is a welding technique that utilizes a high-energy heat source to penetrate the upper layer material, melting the lower layer material and forming a connection. The core of penetration welding lies in using a high-energy-density heat source to penetrate the upper layer material, causing the lower layer material to absorb energy and melt, ultimately forming a strong weld under pressure or natural cooling. Here, the upper layer material refers to the component closer to the heat source among the two parts to be connected, while the lower layer material refers to the component farther from the heat source. When penetration welding is required to connect the electrode post 13 to the current collector 12, since the current collector 12 is already connected to the electrode tab of the battery cell, the electrode post 13 is used as the upper layer material, and the current collector 12 as the lower layer material. It is understood that this application does not limit the specific type of penetration welding. Depending on the heat source, penetration welding can be divided into laser penetration welding, electron beam penetration welding, and arc penetration welding, etc. The specific type of penetration welding can be adaptively selected according to the actual welding needs.

[0042] The battery end cap 1 of this application connects the current collector 12 and the terminal post 13 via through-welding. Through-welding penetrates the terminal post 13, causing a localized portion of the current collector 12 to absorb energy and melt, thus connecting the current collector 12 and the terminal post 13. Therefore, when the current collector 12 is connected to the terminal tab and then to the terminal post 13, through through-welding, the operator can effectively utilize the space on the side of the terminal post 13 furthest from the current collector 12 (i.e., the side of the end plate 11 opposite to the current collector 12) to achieve the connection. The current collector 12 no longer needs to be bent as in existing technologies to create a welding space between the terminal post 13 and the current collector 12. In other words, through-welding allows the current collector 12 and the terminal post 13 to be directly connected. The collector plate 12 no longer needs to be bent, reducing the processing step that requires bending the collector plate 12, which facilitates the production and manufacturing of the collector plate 12. Furthermore, the space occupied by the collector plate 12 will not increase, and it is also easier to assemble the end of the cylindrical battery.

[0043] Furthermore, when the electrode post 13 and the current collector 12 are connected by through welding, the weld seam formed by through welding is more aesthetically pleasing and there is no particulate contamination during processing. In addition, the heat-affected zone of through welding is small, the deformation of the electrode post 13 and the current collector 12 is smaller, and the strength of the electrode post 13 and the current collector 12 does not change significantly after welding.

[0044] In through-welding, the material of the two connected components affects the weld quality. For example, when the two connected components are made of different materials, their thermal expansion rates are inconsistent, which can easily lead to residual stress after cooling, causing weld deformation, cracks, or even weld breakage. Therefore, in some embodiments, a connecting block 121 can be provided on the manifold 12, and the end of the pole 13 closest to the manifold 12 is welded to the connecting block 121 by through-welding. The material of the connecting block 121 is the same as that of the pole 13.

[0045] To facilitate the display of the internal structure of the battery end cap, the battery end cap can be cut along the AA direction. Figure 2 This is a schematic diagram of the structure of the battery end cap after being cut open along the AA direction, as disclosed in the embodiments of this application; Figure 3 yes Figure 1 A schematic diagram of the AA cross-section of the battery end cap. See also: Figure 2 and Figure 3 The collector plate 12 can be indirectly connected to the pole post 13 through the connecting block 121 of the same material. At this time, the connecting block 121 is the lower material and the pole post 13 is the upper material. When the materials of the collector plate 12 and the pole post 13 are different, the collector plate 12 can be connected to the connecting block 121 first, and then the connecting block 121 and the pole post 13 can be connected by penetration welding. Since the connecting block 121 and the pole post 13 are of the same material, the degree of thermal expansion of the connecting block 121 and the pole post 13 is consistent, which ensures the welding strength between the connecting block 121 and the pole post 13 and avoids the deformation, cracking or even breakage of the weld after the penetration welding of the connecting block 121 and the pole post 13.

[0046] In some embodiments, the connecting block 121 and the terminal post 13 can be made of metals such as aluminum. While ensuring conductivity, the low density of aluminum can reduce the weight of the battery end cover 1. Correspondingly, the current collector 12 can be made of materials such as copper. When the current collector 12 and the connecting block 121 are made of different materials, when the current collector 12 is first connected to the connecting block 121, a welding method such as friction welding can be used to connect the current collector 12 and the connecting block 121.

[0047] Typically, the pole post 13 is constructed in a cylindrical shape, and correspondingly, its end face is circular. In some embodiments, the connecting block 121 can also be constructed in a cylindrical shape, so that the end face shape of the connecting block 121 is similar to that of the pole post 13, both being circular. During penetration welding, the connecting block 121 can have more area to abut against the end face of the pole post 13, ensuring sufficient welding area between the connecting block 121 and the pole post 13 and guaranteeing the welding strength between the connecting block 121 and the pole post 13.

[0048] As described above, the core of penetration welding lies in using a high-energy-density heat source to penetrate the upper layer material, causing the lower layer material to absorb energy and melt. When the electrode post 13 is used as the upper layer material, in order to ensure that the heat source can penetrate the electrode post 13, in some embodiments, a first blind hole 131 can be provided on the end face of the electrode post 13 away from the collector plate 12. The bottom of the first blind hole 131 is configured to form a thinning hole for welding the electrode post 13 and the connecting block 121. Continuing to refer to... Figure 2 and Figure 3 It is understandable that the thinning hole here refers to a process hole designed to reduce the thickness at the welding position when the structure such as the pole post 13 has a large thickness, in order to ensure smooth penetration welding. The distance between the bottom of the first blind hole 131 and the connecting block 121 is smaller than the distance between the end face of the pole post 13 away from the collector plate 12 and the connecting block 121. In this way, when the bottom of the first blind hole 131 is used as a thinning hole for welding the pole post 13 and the connecting block 121, the heat source can penetrate the pole post 13 more easily, ensuring the welding effect between the connecting block 121 and the pole post 13. It is understandable that the depth of the first blind hole 131 can be designed according to actual needs, as long as the distance between the bottom of the first blind hole 131 and the connecting block 121 meets the welding conditions for penetration welding.

[0049] In some embodiments, the end plate 11 may be provided with a mounting hole 111 extending along the thickness direction of the end plate 11. The pole post 13 includes a first column 132 and a second column 133. One end of the first column 132 is accommodated in the mounting hole 111, and the other end extends out of the mounting hole 111. One end of the second column 133 is accommodated in the mounting hole 111 and abuts against one end of the first column 132, and the other end extends out of the mounting hole 111 for welding to the connecting block 121. The maximum radial dimension of at least one of the first column 132 and the second column 133 is greater than the diameter of the mounting hole 111. Through the design of the first column 132 and the second column 133, the pole post 13 can be constructed as a split structure. During the assembly process, a single damaged first pole post 13 or second pole post 13 can be replaced independently without scrapping the entire pole post 13. Furthermore, if the maximum radial dimension of at least one of the first column 132 and the second column 133 is greater than the diameter of the mounting hole 111, the end plate 11 and the terminal post 13 can be connected, further facilitating the assembly of the terminal post 13. Moreover, the axial splicing of the terminal post 13 with the first column 132 and the second column 133 disperses external loads such as battery cycle expansion forces or vibration impacts to two independent components, reducing the risk of overall breakage of the terminal post 13 and extending its service life.

[0050] When the electrode post 13 adopts the split structure described above, in some embodiments, the first post 132 may be provided with a through hole 1321 extending along the axial direction of the electrode post 13, and the second post 133 may be provided with a second blind hole 1331. The second blind hole 1331 is provided on the end face of the second post 133 facing the first post 132 and extends along the axial direction of the electrode post 13. The through hole 1321 and the second blind hole 1331 are interconnected and together form the first blind hole 131. In this way, when the electrode post 13 is split, the bottom of the second blind hole 1331 is formed as the bottom of the first blind hole 131. At this time, the bottom of the second blind hole 1331 can form a thinning hole when welding the electrode post 13 to the connecting block 121, ensuring the connection between the electrode post 13 and the connecting block 121. At the same time, providing holes on the two posts can reduce the weight of the electrode post 13 as much as possible, so that the weight of the battery end cap 1 can be reduced.

[0051] A first boss 1322 may be provided on the outer peripheral surface of the first column 132 extending beyond the mounting hole 111, and a second boss 1332 may be provided on the outer peripheral surface of the second column 133 extending beyond the mounting hole 111. The first boss 1322 and the second boss 1332 extend radially along the pole post 13, and the first boss 1322 and the second boss 1332 abut against the end plate 11. In this way, the two bosses can limit the pole post 13 in the axial direction, and the two bosses can achieve a clamping effect, clamping the end plate 11 to fix the first column 132 and the second column 133, preventing the pole post 13 from shaking in the circumferential direction and ensuring the stability of the pole post 13.

[0052] In some embodiments, a third blind hole 1323 may also be provided on the first column 132. The third blind hole 1323 is located on the end face of the first column 132 opposite to the second column 133, and the diameter of the third blind hole 1323 may be larger than that of the through hole 1321. See details for further information. Figure 4 In this way, the bottom of the third blind hole 1323 can form a step-like structure together with the through hole 1321 in the first column 132. At this time, the first column 132 and the second column 133 can also be connected by through welding. In this way, when the first column 132 and the second column 133 are respectively provided with bosses, the first column 132 and the second column 133 can be connected to each other to form the pole column 13, making more reasonable use of the space in the first column 132.

[0053] In some embodiments, the battery end cap 1 may further include a first insulating member 14 and a second insulating member 15. The first insulating member 14 is sleeved outside the first post 132 and extends between the first boss 1322 and the end plate 11, and is used to provide insulation between the first post 132 and the end plate 11. The second insulating member 15 is sleeved outside the second post 133 and extends between the second boss 1332 and the end plate 11, and is used to provide insulation between the second post 133 and the end plate 11. (Continuing to refer to...) Figure 4 In this way, the first insulating member 14 enables the first post 132 and the first protrusion 1322 to achieve insulation isolation between themselves and the end plate 11, and the second insulating member 15 enables the second post 133 and the second protrusion 1332 to achieve insulation isolation between themselves and the end plate 11. This ensures that the terminal post 13 and the protrusion will not have electrical connection with the end plate 11. When the battery end cover 1 is used in the battery, it can prevent the battery from short-circuiting, thereby improving the battery's safety, reliability, and lifespan.

[0054] A positioning groove 134 can be formed on the end face of the pole post 13 facing the collector plate 12. The connecting block 121 is configured such that it is located within the positioning groove 134 when the connecting block 121 is connected to the pole post 13. Thus, when the connecting block 121 is connected to the pole post 13, the bottom of the positioning groove 134 can abut against the surface of the connecting block 121, ensuring electrical connection between the connecting block 121 and the pole post 13. The wall of the positioning groove 134 can also abut against the surface of the connecting block 121. In this case, the wall of the positioning groove 134 can limit the surface of the connecting block 121, preventing displacement and shaking of the connecting block 121. Simultaneously, when the connecting block 121 is connected to the pole post 13, the positioning groove 134 can prevent the connection position of the connecting block 121 from shifting. As described above, when the pole post 13 adopts a split structure, the positioning groove 134 can be set on the surface of the second column 133 facing the collector plate 12.

[0055] In some embodiments, the battery end cap 1 may further include a third insulating member 16, which is disposed on the surface of the end plate 11 facing the current collector 12. The third insulating member 16 is used to insulate the end plate 11 and the current collector 12. In this way, the third insulating member 16 can achieve insulation isolation between the end plate 11 and the current collector 12, ensuring that no electrical connection occurs between the end plate 11 and the current collector 12. When the battery end cap 1 is applied to a battery, it can prevent short circuits in the battery and improve battery safety, reliability, and lifespan.

[0056] See Figure 5 This application also discloses a battery 100, which includes the battery end cap 1 as described in any of the above claims and has all of its beneficial effects, which will not be repeated here. In this application, the battery 100 can be a cylindrical battery, a prismatic battery, etc.

[0057] In addition, the battery 100 generally includes a housing 2 and an electrode assembly (not shown in the figure) disposed in the housing 2, and the battery end cap 1 covers the opening of the housing 2.

[0058] See Figure 6 This application also discloses a battery pack 200, including at least one battery 100 as described above. The battery 100 described above has all the beneficial effects of the batteries in the foregoing embodiments, which will not be repeated here.

[0059] In addition, see Figure 7 This application also discloses an electrical device 300, including a battery pack 200 as described above, which supplies power to the electrical device 300. The battery pack 200 possesses all the beneficial effects of the battery packs in the foregoing embodiments, which will not be repeated here.

[0060] Among them, electrical equipment 300 includes, but is not limited to, energy storage equipment. For example, energy storage equipment may be an energy storage container or a home energy storage cabinet.

[0061] Optionally, the electrical equipment 300 may also include an energy conversion device 310 and an electrical load 320, etc. The battery pack 200 can store at least a portion of the electrical energy converted by the energy conversion device 310 and use it to provide power to the electrical load 320. The energy conversion device 310 is used to convert other forms of energy into electrical energy. The electrical load 320 includes household appliances such as televisions and refrigerators, as well as electrical loads such as streetlights.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery end cap, characterized by, include: End plate (11); A collector plate (12) is disposed on one side of the end plate (11); as well as The pole (13) is inserted through the end plate (11) along the thickness direction of the end plate (11). The two ends of the pole (13) extend out of the two sides of the end plate (11) in the thickness direction of the end plate (11). The end of the pole (13) near the collector plate (12) is welded to the collector plate (12) by penetration welding.

2. The battery end cover of claim 1, wherein, A connecting block (121) is provided on the collector plate (12). The end of the pole (13) near the collector plate (12) is welded to the connecting block (121) by penetration welding. The material of the connecting block (121) is the same as that of the pole (13).

3. The battery end cap according to claim 2, characterized in that, A first blind hole (131) is provided on the end face of the pole post (13) away from the collector plate (12), and the bottom of the first blind hole (131) is configured to form a thinning hole when the pole post (13) is welded to the connecting block (121).

4. The battery end cap according to claim 3, characterized in that, The end plate (11) is provided with a mounting hole (111) extending along the thickness direction of the end plate (11), and the pole post (13) includes a first post (132) and a second post (133). One end of the first column (132) is housed in the mounting hole (111), and the other end extends outside the mounting hole (111). One end of the second column (133) is housed in the mounting hole (111) and abuts against one end of the first column (132), and the other end extends outside the mounting hole (111) for welding to the connecting block (121). The maximum radial dimension of at least one of the first column (132) and the second column (133) is greater than the diameter of the mounting hole (111).

5. The battery end cap according to claim 4, characterized in that, The first column (132) is provided with a through hole (1321) extending along the axial direction of the pole post (13), and the second column (133) is provided with a second blind hole (1331). The second blind hole (1331) is provided on the end face of the second column (133) facing the first column (132) and extends along the axial direction of the pole post (13). The through hole (1321) and the second blind hole (1331) are interconnected and together form the first blind hole (131).

6. The battery end cap according to claim 4, characterized in that, A first boss (1322) is provided on the outer peripheral surface of the first column (132) extending outside the mounting hole (111), and a second boss (1332) is provided on the outer peripheral surface of the second column (133) extending outside the mounting hole (111). The first boss (1322) and the second boss (1332) extend radially along the pole post (13), and the first boss (1322) and the second boss (1332) abut against the end plate (11).

7. The battery end cap according to claim 6, characterized in that, The battery end cap (1) further includes a first insulating member (14) and a second insulating member (15). The first insulating member (14) is sleeved on the first column (132) and extends between the first boss (1322) and the end plate (11). The first insulating member (14) is used to provide insulation between the first column (132) and the end plate (11). The second insulating member (15) is sleeved on the second column (133) and extends between the second boss (1332) and the end plate (11). The second insulating member (15) is used to provide insulation between the second column (133) and the end plate (11).

8. The battery end cap according to any one of claims 2-7, characterized in that, A positioning groove (134) is provided on the end face of the pole post (13) facing the collector plate (12), and the connecting block (121) is configured to be placed in the positioning groove (134) when the connecting block (121) is connected to the pole post (13).

9. The battery end cap according to any one of claims 1-7, characterized in that, The battery end cap (1) also includes a third insulating member (16), which is disposed on the surface of the end plate (11) facing the current collector (12) and is used to insulate the end plate (11) and the current collector (12).

10. A battery, characterized in that, The battery includes a battery end cap (1) as described in any one of claims 1-9 above.

11. A battery pack, characterized in that, include: At least one battery as described in claim 10.

12. An electrical appliance, characterized in that, The battery pack includes the battery pack of claim 11, which is used to supply power to the electrical device.

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