A cylindrical battery and battery pack

Abstract

This utility model provides a cylindrical battery and battery pack; the cylindrical battery includes: a shell, an electrode assembly, a cover plate, and a current collector. The shell includes a surrounding sidewall, one end of which has an opening. The electrode assembly is housed within the shell and includes tabs facing the opening. The cover plate is connected to the shell and seals the opening. The current collector is disposed between the electrode assembly and the cover plate. The current collector includes a first connecting portion and a second connecting portion. The first connecting portion is fixedly connected to the tabs, and a plurality of second connecting portions are arranged around the outer periphery of the first connecting portion and fixedly connected to the shell and / or the cover plate. Along the height direction of the cylindrical battery, a support portion is provided between the current collector and the electrode assembly. The support portion is located between the sidewall of the shell and the tabs and is insulated from the electrode assembly, which improves the technical problem of the current collector detaching due to vibration and improves the battery's performance, service life, and safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cylindrical battery and battery pack. Background Technology

[0002] The current collector is an important component of a cylindrical battery, serving as a key part connecting the electrode assembly and the housing. During battery assembly, the current collector is placed between the electrode assembly and the cover plate, connected to the electrode assembly via a first connecting part, and welded to the housing and / or cover plate via a second connecting part, thereby achieving electrical connection between the electrode assembly and the housing.

[0003] In the operating conditions of cylindrical batteries, the current collector is easily subjected to Z-axis (i.e., axial) vibration and impact, which can cause desoldering and directly affect the battery's performance, lifespan, and safety. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present invention provides a cylindrical battery and battery pack to improve the technical problem of the current collector desoldering due to vibration.

[0005] This utility model provides a cylindrical battery, comprising: a casing, an electrode assembly, a cover plate, and a current collector. The casing includes a surrounding sidewall, one end of which has an opening; the electrode assembly is housed within the casing and includes tabs facing the opening; the cover plate is connected to the casing and seals the opening; the current collector is disposed between the electrode assembly and the cover plate; the current collector includes a first connecting portion and a second connecting portion, the first connecting portion being fixedly connected to the tabs, and a plurality of second connecting portions being arranged around the outer periphery of the first connecting portion and fixedly connected to the casing and / or the cover plate.

[0006] Along the height direction of the cylindrical battery, a support is provided between the current collector and the electrode assembly. The support is located between the side wall of the housing and the tab and is insulated from the electrode assembly.

[0007] In one embodiment of the present invention, the end face of the electrode assembly facing the opening includes a central region and an edge region surrounding the central region, the central region protruding toward the cover plate relative to the edge region; the second connecting portion protruding toward the cover plate relative to the first connecting portion, and the support portion disposed between the second connecting portion and the edge region, and abutting against the second connecting portion and / or the edge region.

[0008] In one embodiment of the present invention, the sidewall includes a stepped portion, the stepped portion having a mating surface facing the cover plate, and the second connecting portion overlapping the mating surface; the first connecting portion and the second connecting portion are connected by a bent section, and the cover plate is provided with an inclined surface opposite to the bent section, the inclined surface pressing against the bent section so that the second connecting portion abuts against the sidewall.

[0009] In one embodiment of this utility model, the support portion is an elastic insulating component independent of the collector plate.

[0010] In one embodiment of the present invention, the support portion includes an annular body and a plurality of ribs. The plurality of ribs are at least disposed on one side of the annular body near the second connecting portion. One side of the ribs is connected to the annular body, and the other side extends obliquely to the outer sidewall.

[0011] Among them, multiple ribs used to support the same second connection part form a support section of the support part.

[0012] In one embodiment of this utility model, multiple ribs are respectively arranged on both sides of the axial direction of the ring body, and the cross-section of the support part on the axial section is a fishbone shape or a tree branch shape.

[0013] In one embodiment of the present invention, the support portion includes multiple support partitions that support multiple second connecting portions respectively, and a channel is provided between adjacent multiple support partitions, the channel penetrating the support portion radially.

[0014] In one embodiment of the present invention, the support portion is a protrusion disposed on the collector plate and protruding to one side of the electrode assembly, and the protrusion has an insulating material on at least one surface near the electrode assembly.

[0015] The protrusions are provided on the manifold by any one of the following methods: stamping, bonding, riveting, injection molding, or snap-fitting. At least one second connecting part is provided with one or more protrusions.

[0016] In one embodiment of this utility model, the protrusion is a raised strip extending radially along the cylindrical battery, wherein:

[0017] The convex rib abuts against the inner wall of the side wall of the housing;

[0018] And / or, the second connecting part protrudes towards the cover plate side relative to the first connecting part, the second connecting part is connected to the first connecting part through a bent section, and the protrusion extends from the second connecting part to the bent section.

[0019] This utility model also provides a battery pack, including the cylindrical battery described above.

[0020] The beneficial effects of this utility model are as follows: The cylindrical battery proposed in this utility model provides a support portion between the current collector and the electrode assembly, which fills at least part of the space in the height direction between the current collector and the electrode assembly, providing support force. This ensures that the tabs, current collector, cover plate, and shell are in close contact, forming a whole. Compared with the prior art, under vibration conditions, the support portion can provide support for the current collector, limiting the deformation space of the current collector and preventing the current collector from desoldering or breaking due to excessive deformation. At the same time, for the cylindrical battery, the force is changed from individual forces between two components to force as a whole, improving the pull of the welds between the tabs and the current collector, as well as the pull of the welds between the current collector and the shell, protecting the welded areas, and solving the technical problem of current collector desoldering due to vibration in existing cylindrical batteries. This improves the battery's performance, service life, and safety. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] In the attached diagram:

[0023] Figure 1 A schematic diagram of the structure of a secondary battery in one direction according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of a secondary battery from another direction according to an embodiment of the present invention;

[0025] Figure 3 A cross-sectional view of a secondary battery provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of an electrode assembly provided in one embodiment of the present invention;

[0027] Figure 5 Provided in one embodiment of this utility model Figure 3 A magnified view of a section at point A in the middle;

[0028] Figure 6 Provided in one embodiment of this utility model Figure 5 Enlarged view of a section of the central support;

[0029] Figure 7 Provided in one embodiment of this utility model Figure 5 A magnified 3D view of the central support section, omitting the cover plate;

[0030] Figure 8 Provided in one embodiment of this utility model Figure 5 Schematic diagram of the central support section;

[0031] Figure 9 Provided in one embodiment of this utility model Figure 5 Schematic diagram of the central flow disk;

[0032] Figure 10 Provided in one embodiment of this utility model Figure 5 Schematic diagram of the middle cover plate;

[0033] Figure 11 Provided in another embodiment of this utility model Figure 3 A magnified view of a section at point A in the middle;

[0034] Figure 12 Provided in one embodiment of this utility model Figure 11 Enlarged view of a section of the central support;

[0035] Figure 13 Provided in one embodiment of this utility model Figure 11 Schematic diagram of the central flow disk;

[0036] Figure 14 Provided in another embodiment of this utility model Figure 11 Schematic diagram of the central flow disk;

[0037] Figure 15 Provided in another embodiment of the present utility model Figure 11 Schematic diagram of the central flow disk;

[0038] Figure 16 Provided in another embodiment of the present utility model Figure 11 Schematic diagram of the central flow disk;

[0039] Figure 17 This is a schematic diagram of the battery pack provided in one embodiment of the present invention;

[0040] Figure 18 This is a schematic diagram of the structure of an electronic device provided in one embodiment of the present invention.

[0041] The attached figures are labeled as follows:

[0042] 1. Electronic device; 10. Battery pack; 11. Working part; 101. Housing; 102. Housing cover; 100. Cylindrical battery; 110. Casing; 111. End wall; 112. Side wall; 1121. Stepped portion; 113. Opening; 120. Electrode assembly; 121. First electrode; 1211. Negative current collector; 1212. First coating area; 1213. First empty foil; 122. Separator; 123. Second electrode; 1231. Positive current collector; 1232. ... Second coating area; 1233, second empty foil; 124, first electrode tab; 125, second electrode tab; 126, central area; 127, edge area; 130, cover plate; 131, inclined surface; 140, collector plate; 141, first connecting part; 142, second connecting part; 143, bent section; 150, pole post; 160, support part; 161, annular body; 162, rib; 163, channel; 164, first protrusion; 165, second protrusion; 166, third protrusion. Detailed Implementation

[0043] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0045] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0046] The tabs and current collectors of existing cylindrical batteries have a large space in the height direction. When subjected to Z-axis vibration and impact, the welds between the current collector, cover plate and shell may be stretched and broken. To solve this problem, this utility model provides the following solution.

[0047] Please see Figures 1-18 This utility model provides a cylindrical battery 100 and a battery pack 10. By providing a support portion 160 between the current collector 140 and the electrode assembly 120, the support portion 160 fills at least part of the space between the current collector 140 and the electrode assembly 120 in the height direction, reducing or even limiting the vibration displacement of the current collector 140 in the axial direction (same as the electrode assembly 120 in the height direction), improving the welding pull between the current collector 140, the cover plate 130 and the housing 110, and protecting the welding area.

[0048] Please see Figures 1-3 The cylindrical battery 100 includes a housing 110, an electrode assembly 120, a cover plate 130, a current collector 140, and a support portion 160.

[0049] Please continue reading. Figures 1-3 and Figure 5 The housing 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111. As long as a stable sealing and electrical connection can be formed, the connection between the end wall 111 and the side wall 112 can be achieved in various ways, such as integral stamping, integral casting, or separate welding. The side wall 112 is cylindrical and surrounds the outer edge of the end wall 111, with a circular opening 113 formed at the end of the side wall 112 facing away from the end wall 111. A receiving cavity is formed within the housing 110 formed by the end wall 111 and the side wall 112 to accommodate the electrode assembly 120, electrolyte, and other necessary battery components.

[0050] Please see Figures 3-4 Electrode assembly 120 is housed within housing 110 and is a component in cylindrical battery 100 where electrochemical reactions occur. Housing 110 may contain one or more electrode assemblies 120. Electrode assembly 120 includes a wound structure formed by stacking and winding a first electrode 121, a second electrode 123, and a separator 122. The first electrode 121 and the second electrode 123 have opposite polarities. In some embodiments, the first electrode 121 is a positive electrode and the second electrode 123 is a negative electrode; in other embodiments, the first electrode 121 is a negative electrode and the second electrode 123 is a positive electrode.

[0051] Please see Figures 3-4In this embodiment, the first electrode 121 is a negative electrode. The first electrode 121 includes a negative current collector 1211 and a negative active material. The negative active material is coated on the surface of the negative current collector 1211. The negative current collector 1211 includes a first coating area 1212 coated with active material and an empty foil without active material. In order to distinguish it from the empty foil on the second electrode 123, the empty foil is called the first empty foil 1213. The first empty foil 1213 is located at the end of the first electrode 121. The first empty foil 1213 extends out of the diaphragm 122 along the winding axis of the electrode assembly 120 to form an electrode tab. In order to distinguish it from the electrode tab formed by the second electrode 123, the electrode tab located on the first electrode 121 is called the first electrode tab 124. The first electrode tab 124 is the corresponding negative electrode tab.

[0052] Please continue reading. Figures 3-4 The second electrode 123 is a positive electrode. Specifically, the second electrode 123 includes a positive current collector 1231 and a positive active material. The positive active material is coated on the surface of the positive current collector 1231. The positive current collector 1231 includes a second coating area 1232 coated with active material and a second empty foil 1233 uncoated with active material. The second empty foil 1233 is located at the end of the second electrode 123. The other end of the second empty foil 1233 extends out of the diaphragm 122 along the winding axis of the electrode assembly 120 and is bent toward the winding axis to form a second tab 125. The second tab 125 is the corresponding positive tab.

[0053] A separator 122 is disposed between the first electrode 121 and the second electrode 123 to isolate the positive electrode active material layer and the negative electrode active material layer. Taking a lithium-ion cylindrical battery 100 as an example, the positive electrode current collector 1231 can be made of aluminum, and the positive electrode active material layer includes positive electrode active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector 1211 can be made of copper, and the negative electrode active material layer includes negative electrode active material, which can be carbon or silicon, etc. The substrate material of the separator 122 can be polypropylene (PP) or polyethylene (PE), etc. To protect and insulate the electrode assembly 120, an insulating film can also be wrapped around the electrode assembly 120. The insulating film can be synthesized from PP, PE, polyethylene terephthalate (PET), polyvinyl chloride (PVC), or other polymer materials.

[0054] Please see Figures 1-3 and Figure 5Furthermore, if the first tab 124 faces the end wall 111 or the opening 113, then the second tab 125 faces the other end of the housing 110. In this embodiment, the second tab 125 faces the end wall 111 and is electrically connected to the post 150, making the post 150 positively charged. The first tab 124 faces the opening 113, and the housing 110 is electrically connected to the first tab 124, thus becoming negatively charged. However, in another embodiment, the first tab 124 can be connected to the post 150, and the second tab 125 can be connected to the housing 110.

[0055] Please see Figure 3 The electrode post 150 is fixed to the end wall 111 and electrically connected to the electrode assembly 120. Specifically, the end wall 111 is provided with an electrode post hole, and the electrode post 150 is installed through the electrode post hole and insulated from the end wall 111. The end of the electrode post 150 facing the electrode assembly 120 passes through the end wall 111 and is directly electrically connected to the second electrode tab 125 or indirectly connected via a transfer connection. The structure of the electrode post 150 can be any suitable form that can pass through the end wall 111 and be electrically connected to the second electrode tab 125 of the electrode assembly 120. For example, the cross-section can be circular, square, prismatic, or an irregular contour that can achieve stable conductivity. The shape of the electrode post hole corresponds to the shape of the electrode post 150. In this embodiment, the cross-section of the electrode post 150 is circular.

[0056] Please see Figure 5 The cover plate 130 is connected to the housing 110 and seals the opening 113, that is, the cover plate 130 covers and seals the opening 113. In one example, the outer peripheral surface of the cover plate 130 and the inner wall of the side wall 112 are welded together.

[0057] Please see Figures 5-7 The current collector 140 is disposed between the electrode assembly 120 and the cover plate 130, and is used to connect the first tab 124 and the cover plate 130. During battery assembly, the current collector 140 is first welded to the first tab 124, then the welded assembly formed by the current collector 140 and the first tab 124 is placed inside the housing 110, then the cover plate 130 is assembled, and finally the current collector 140, the cover plate 130, and the housing 110 are welded together to achieve battery sealing. The current collector 140 includes a first connecting part 141 and a second connecting part 142. The first connecting part 141 is fixedly connected to the first tab 124, and a plurality of second connecting parts 142 are arranged around the outer periphery of the first connecting part 141, that is, the second connecting parts 142 are located radially outside the first connecting part 141, and are fixedly connected to the housing 110 and / or the cover plate 130.

[0058] The second connecting portion 142 of the collector plate 140 can be fixedly connected to the side wall 112 of the housing 110 or to the cover plate 130. The fixed connection can be achieved using various structural forms readily conceived by those skilled in the art, such as welding or riveting. When the second connecting portion 142 is welded to the side wall 112 of the housing 110, since the cover plate 130, collector plate 140, and housing 110 have contact areas on the inner wall of the side wall 112 of the housing 110, they can be electrically connected at this inner wall through welding. Compared to the original method of welding the collector plate 140 to the housing 110 and then the cover plate 130 to the housing 110, this eliminates a laser welding process, reduces the number of welding steps, simplifies the process, improves assembly efficiency, and achieves a reliable electrical connection. In this case, the first connecting portion 141 can be referred to as the tab connecting portion, and the second connecting portion can be referred to as the housing connecting portion.

[0059] Please see Figure 3 and Figures 5-7 Along the height direction of the cylindrical battery 100 (i.e. Figure 3 In the Z direction, a support portion 160 is provided between the collector plate 140 and the electrode assembly 120. The support portion 160 is located between the side wall 112 of the housing 110 and the first electrode tab 124, and is insulated from the electrode assembly 120. The support portion 160 fills at least part of the space between the collector plate 140 and the electrode assembly 120 in the height direction, reduces or even limits the vibration displacement of the collector plate 140 in the axial direction (same as the electrode assembly 120 in the height direction), improves the welding pull between the collector plate 140, the cover plate 130 and the housing 110, and protects the welding area.

[0060] In one example, along the height direction of the cylindrical battery 100 (i.e. Figure 3 In the Z direction, one end of the support 160 abuts against the collector plate 140, and the other end abuts against the electrode assembly; so that the collector plate 140, the cover plate 130, the housing 110, and the support 160 form a whole. Under vibration conditions, the force on the whole changes from individual forces between two parts to forces on the whole, which improves the axial vibration displacement of the collector plate 140, improves the weld pull between the collector plate 140, the cover plate 130, and the housing 110, and protects the weld area.

[0061] Please see Figures 5-7The end face of the electrode assembly 120 facing the opening 113 may include a central region 126 and an edge region 127 surrounding the central region 126. The central region 126 protrudes toward the cover plate 130 relative to the edge region 127, and the second connection portion 142 protrudes toward the cover plate 130 relative to the first connection portion 141. In one example, the number of stacked layers of the first tabs 124 in the central region 126 is greater than the number of stacked layers of the first tabs 124 in the edge region 127. In another example, no first tabs 124 are provided in the edge region 127, and multiple first tabs 124 are stacked in the central region 126 and then welded to the first connection portion 141 of the collector plate 140.

[0062] The central region 126 protrudes towards the cover plate 130 relative to the edge region 127, resulting in a height difference between the central region 126 and the edge region 127. This allows for a large space in the height direction between the second connecting part 142 and the edge region 127 after the collector plate 140 is assembled. The support part 160 is disposed between the second connecting part 142 and the edge region 127 and abuts against the second connecting part 142 and / or the edge region 127. In specific implementations, the support part 160 may abut only against the second connecting part 142, only against the edge region 127, or against both. The support portion 160 fills at least part of the space in the height direction between the second connecting portion 142 and the edge region 127, providing a certain support force for the collector plate 140, improving the axial vibration displacement of the collector plate 140, improving the weld pull between the collector plate 140, the cover plate 130 and the housing 110, protecting the weld area, and at the same time, the support portion 160 abuts against the second connecting portion 142 and / or the edge region 127, facilitating the positioning and installation of the support portion 160 itself.

[0063] In one example, please refer to [link / reference]. Figures 5-6 The side wall 112 may include a stepped portion 1121. In a specific implementation, the stepped portion 1121 may be located between the electrode assembly 120 and the cover plate 130, and has a mating surface facing the cover plate 130. The second connecting portion 142 overlaps with the mating surface. The mating surface of the stepped portion 1121 mates with the second connecting portion 142, which plays a better role in limiting and supporting the second connecting portion 142, thereby providing better support for the collector plate 140. Furthermore, the setting of the stepped portion 1121 increases the contact area between the second connecting portion 142 and the side wall 112 of the housing 110, which facilitates welding at this location, reduces the difficulty of welding connection, and further improves the reliability of welding connection.

[0064] The first connecting part 141 and the second connecting part 142 can be connected by the bending section 143. The cover plate 130 is provided with an inclined surface 131 opposite to the bending section 143. During the process of the cover plate 130 being installed and pressed down into the opening 113, the inclined surface 131 presses against the bending section 143 and causes the second connecting part 142 to slide along the mating surface (i.e., the overlapping platform) toward the side wall 112, so that the collecting plate 140 extends outward in the radial direction. At the same time, the cover plate 130 extends outward in the radial direction. Welding at this location can reduce the difficulty of welding connection and further improve the reliability of welding connection.

[0065] In one embodiment, see Figures 5-10 The support portion 160 is an independently provided elastic insulating component, meaning it is not integrated with the current collector 140. The elastic insulating component can employ various structural forms readily conceived by those skilled in the art, such as springs or spring sheets made of insulating material. Under vibration conditions, the elastic insulating component fills at least a portion of the space between the current collector 140 and the electrode assembly 120 in the height direction. The elastic insulating component can deform elastically, providing cushioning, preventing edge collapse, absorbing axial forces generated during vibration, improving the axial vibration displacement of the current collector 140, reducing solder joint pull, and protecting the solder joint area. Simultaneously, during the downward assembly of the current collector 140, the elastic insulating component abuts against the current collector 140 and the electrode assembly 120, preventing over-assembly of the current collector 140 in the height direction and acting as a limiting element.

[0066] Furthermore, the outer wall of the support 160 can abut against the inner wall of the side wall 112 of the housing 110, which facilitates the positioning and installation of the support 160, improves the positioning effect, and prevents the collector plate 140 from excessively extending outward in the radial direction during the pressing assembly process.

[0067] Please see Figures 6-8The support portion 160 may include an annular body 161 and multiple ribs 162. The multiple ribs 162 are at least located on the side of the annular body 161 near the second connecting portion 142. One side of the ribs 162 is connected to the annular body 161 along the Z-direction, and the other side extends obliquely towards the outer sidewall 112. Thus, the support portion 160, with its annular body 161 and multiple ribs 162 structure, allows the ribs 162 to easily deform elastically under vibration conditions, providing better buffering and absorbing the axial force generated during vibration. This effectively addresses the technical problem of the collector plate 140 detaching due to vibration. Furthermore, the ribs 162 extend obliquely towards the outer sidewall 112, meaning they form an acute angle with the second connecting portion 142. This ensures that when the cover plate 130 is installed to the opening... During the pressing assembly process of 113, this arrangement facilitates the sliding of the second connecting part 142 along the mating surface (i.e., the overlapping platform) towards the side wall 112, making it easier for the collector plate 140 to extend outward in the radial direction and playing a guiding and limiting role. In addition, during the pressing process, it increases the strength of the collector plate 140 body, reduces radial deformation, and ensures parallel sliding to the welding position of the overlapping platform. At the same time, under vibration conditions, it can provide resistance to the pulling of the first tab 124 at the welding part between the shell 110, the collector plate 140 and the cover plate 130, protecting the welded part. If the rib 162 is set at an obtuse angle with the second connecting part 142, the obtuse angle will provide reverse resistance, which is not conducive to the sliding of the second connecting part 142 along the mating surface (i.e., the overlapping platform) towards the side wall 112.

[0068] The design of the annular body 161 in this embodiment, i.e., the ring design, facilitates the positioning and installation of the support part 160. It is conceivable that in other embodiments, the support part 160 may be a non-annular segmented design, or it may consist only of a single annular body 161. In specific implementation, the support part 160 in this embodiment may be a rubber-molded part, and may be a separate design from the manifold 140, or it may be snap-fitted or glued to the manifold 140.

[0069] Please see Figures 6-8 Multiple ribs 162 can be respectively set on both sides of the annular body 161. The cross section of the support part 160 on the axial section is a fishbone shape or a tree branch shape (that is, the "greater than sign" shape shown in the figure). In this way, multiple ribs 162 are set on both sides of the annular body 161, making the ribs 162 easier to deform elastically, providing better buffer conditions, better absorbing the axial force generated during vibration, and better improving the technical problem of the collector plate 140 detaching due to vibration.

[0070] Please see Figures 7-9A support section is formed by supporting multiple ribs 162 near the second connecting portion 142 to form a support portion 160. The support portion 160 may include multiple support sections that support multiple second connecting portions 142 respectively. A channel 163 (i.e., a venting groove) is provided between adjacent multiple support sections. The channel 163 penetrates the support portion 160 radially, that is, the channel 163 connects the inner and outer regions of the annular body 161. This facilitates venting during installation and prevents gas blockage that could cause the housing 110 to rupture. In specific implementations, the channel 163 can be a through groove or a stepped depth groove, etc. Figure 8-9 In the embodiment shown, there are four second connecting portions 142 evenly distributed circumferentially, and correspondingly, there are also four support partitions evenly distributed circumferentially. It is conceivable that in other embodiments, the second connecting portions 142 may also be a closed-loop design surrounding the first connecting portion 141.

[0071] In another embodiment, please refer to Figures 11-13 The support portion 160 can be a protrusion provided on the collector plate 140 and protruding towards the electrode assembly 120. For easy distinction, this protrusion is referred to as the first protrusion 164. In the case of vibration, the first protrusion 164 fills at least part of the space between the collector plate 140 and the electrode assembly 120 in the height direction, which improves the axial vibration displacement of the collector plate 140 and improves the weld pull between the collector plate 140, the cover plate 130 and the housing 110. At the same time, during the process of pressing down to assemble the collector plate 140, the first protrusion 164 abuts against the collector plate 140 and the electrode assembly 120, which can prevent the collector plate 140 from being over-assembled in the height direction and play a limiting role.

[0072] This embodiment adds an additional reinforcing structure (i.e., a first protrusion 164) to the collector plate 140 itself. Specifically, the first protrusion 164 is integrated into the collector plate 140 at the edge of the collector plate 140 (i.e., the second connecting part 142) to fill the space between the collector plate 140 and the electrode assembly 120 in the height direction, serving as a limiting support. The first protrusion 164 can be disposed on the collector plate 140 by any of the following methods: stamping, bonding (specifically, adhesive bonding), riveting, injection molding (specifically, adhesive injection molding), or snap-fitting, and has an insulating material on at least one surface near the electrode assembly 120. In the embodiment shown in the figure, the first protrusion 164 is a stamped protrusion with an insulating material on its surface.

[0073] In this embodiment, at least one second connecting portion 142 may be provided with one or more first protrusions 164, that is, each second connecting portion 142 is provided with one or more first protrusions 164, so as to provide better support. Figure 13In the embodiment shown, there are four second connecting portions 142 that are evenly distributed; each second connecting portion 142 has two first protrusions 164 that are spaced apart. It is conceivable that in other embodiments, the second connecting portions 142 may also be a closed-loop design surrounding the first connecting portion 141; the number of first protrusions 164 may also be three, four, five, etc.

[0074] In another embodiment, please refer to Figures 11-12 and Figure 14 The support portion 160 can be a protrusion disposed on the current collector 140 and protruding towards the electrode assembly 120. For ease of distinction, this protrusion is referred to as the second protrusion 165. The second protrusion 165 is a ridge extending in the radial direction of the cylindrical battery 100, that is, the extension direction of the second protrusion 165 passes through the center of the current collector 140 to form a strip-shaped profile. In this way, under vibration conditions, the second protrusion 165 fills the space between the current collector 140 and the electrode assembly 120 in the height direction, providing support force. Under vibration conditions, it reduces the axial vibration displacement of the current collector 140 and improves the weld pull between the current collector 140, the cover plate 130 and the housing 110. During the pressing and assembly of the manifold 140, the second protrusion 165 abuts against the manifold 140 and the electrode assembly 120, preventing over-assembly of the manifold 140 in the height direction and acting as a limiting element. Furthermore, during the pressing and assembly of the cover plate 130 to the opening 113, the strip-shaped second protrusion 165 facilitates the sliding of the second connecting portion 142 along the mating surface (i.e., the overlapping platform) towards the side wall 112, allowing the manifold 140 to extend outwards in the radial direction and acting as a guide and limiting element. During the pressing process, it also increases the strength of the manifold 140 body, reduces radial deformation, and ensures parallel sliding to the welding position on the overlapping platform. Additionally, during the pressing and assembly process, the distance between the second protrusion 165 and the inner wall of the side wall 112 of the housing 110 decreases until they abut against each other, improving the positioning effect and preventing the manifold 140 from excessively extending outwards in the radial direction.

[0075] In this embodiment, an additional reinforcing structure (i.e., a second protrusion 165) is added to the current collector 140 itself. Specifically, the second protrusion 165 is integrated into the current collector 140 at the edge of the current collector 140 (i.e., the second connecting part 142) to fill the space between the current collector 140 and the electrode assembly 120 in the height direction, thereby playing a limiting and supporting role. The second protrusion 165 can be provided on the current collector 140 by any of the following methods: stamping, bonding (specifically, adhesive bonding), riveting, injection molding (specifically, adhesive injection molding), or snap-fitting, and has insulating material on at least one surface near the electrode assembly 120. Figure 14 In the embodiment shown, the second protrusion 165 is a stamped strip profile, and the surface of the second protrusion is provided with an insulating material. Figure 15 In the embodiment shown, the second protrusion 165 is a strip-shaped profile that fits the opening of the collector plate 140, and the surface of the second protrusion 165 is provided with an insulating material.

[0076] In this embodiment, at least one second connecting portion 142 may be provided with one or more second protrusions 165, that is, each second connecting portion 142 is provided with one or more second protrusions 165, so as to provide better support. Figure 14 In the embodiment shown, there are four second connecting portions 142 evenly distributed; each second connecting portion 142 is provided with three second protrusions 165, which are spaced apart on the second connecting portion 142. It is conceivable that in other embodiments, the second connecting portion 142 may also be a closed-loop design surrounding the first connecting portion 141; the number of second protrusions 165 may also be two, four, five, etc.

[0077] In another embodiment, please refer to Figures 11-12 and Figure 16 The support portion 160 can be a protrusion disposed on the collector plate 140 and protruding towards the electrode assembly 120. For easy distinction, this protrusion is referred to as the third protrusion 166. The second connecting portion 142 protrudes towards the cover plate 130 relative to the first connecting portion 141. The second connecting portion 142 and the first connecting portion 141 are connected by a bending section 143. The third protrusion 166 extends from the second connecting portion 142 to the bending section 143. That is, the third protrusion 166 is located on the second connecting portion 142 and extends along the radial direction of the cylindrical battery 100 to form a strip-shaped profile, i.e., a ridge. The strip-shaped profile extends to the bending section 143. Thus, under vibration conditions, the third protrusion 166 fills the space between the collector plate 140 and the electrode assembly 120 in the height direction, providing support force and improving the axial vibration position of the collector plate 140 under vibration conditions. The relocation improves the weld pull between the collector plate 140, cover plate 130 and housing 110. At the same time, during the pressing assembly of the collector plate 140, the third protrusion 166 abuts between the collector plate 140 and the electrode assembly 120, which can prevent the collector plate 140 from being over-assembled in the height direction and play a limiting role. In addition, during the pressing assembly of the cover plate 130 to the opening 113, the strip-shaped third protrusion 166 facilitates the sliding of the second connecting part 142 along the mating surface (i.e., the overlapping platform) towards the side wall 112, which facilitates the radial expansion of the collector plate 140 and plays a guiding and limiting role. Furthermore, the strip-shaped third protrusion 166 extends to the bending section 143, which increases the strength of the bending section 143 during the pressing process, thereby reducing radial deformation and ensuring parallel sliding to the welding position of the overlapping platform. Figure 16 In the embodiment shown, the third protrusion 166 extends to the surface of the bent section 143 to increase the strength of the collector plate 140 body.

[0078] In this embodiment, an additional reinforcing structure (i.e., a third protrusion 166) is added to the collector plate 140 itself. Specifically, a third protrusion 166 is integrated into the collector plate 140 at the edge of the collector plate 140 (i.e., the second connecting part 142) to fill the space between the collector plate 140 and the electrode assembly 120 in the height direction, thus playing a limiting and supporting role. Furthermore, during the pressing assembly process, the distance between the protrusion (i.e., the third protrusion 166) and the inner wall of the side wall 112 of the housing 110 is reduced until they abut each other, improving the positioning effect and preventing the collector plate 140 from excessively extending outward in the radial direction.

[0079] The third protrusion 166 can be disposed on the collector plate 140 by any of the following methods: stamping, bonding (specifically, adhesive bonding), riveting, injection molding (specifically, adhesive injection molding), or snap-fitting, and has an insulating material on at least one surface near the electrode assembly 120. In the embodiment shown in the figure, the third protrusion 166 is an adhesive-bonded strip profile, and the surface of the third protrusion 166 is provided with an insulating material.

[0080] In this embodiment, at least one second connecting portion 142 may be provided with one or more third protrusions 166, that is, each second connecting portion 142 is provided with one or more third protrusions 166, so as to provide better support. Figure 16 In the embodiment shown, there are four second connecting portions 142 evenly distributed; each second connecting portion 142 is provided with three third protrusions 166, which are spaced apart on the second connecting portion 142. It is conceivable that in other embodiments, the second connecting portion 142 may also be a closed-loop design surrounding the first connecting portion 141; the number of third protrusions 166 may also be two, four, five, etc.

[0081] Please see Figure 17 This utility model also provides a battery pack 10, which includes the cylindrical battery 100 described above. In one embodiment of the battery pack 10, the battery pack 10 includes a housing 101, a cover 102, and multiple cylindrical batteries 100. The multiple cylindrical batteries 100 are placed in the housing 101 and connected in series or parallel, or a combination of series and parallel connections. The cover 102 seals the housing 101 to protect the multiple cylindrical batteries 100. It should be noted that, in addition to the cylindrical battery 100 of this utility model, the battery pack 10 may also include a thermal management system, circuit board, etc. The battery pack 10 can be a battery module, a battery pack, an energy storage cabinet, etc.; these will not be described in detail here.

[0082] Please see Figure 18The cylindrical battery 100 and battery pack 10 provided by this utility model can be applied to an electronic device 1, which may include the aforementioned cylindrical battery 100 and battery pack 10. The working part 11 is electrically connected to the battery pack 10 to obtain electrical power. As an example, the electronic device 1 is a vehicle, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, but are not limited thereto. The working part 11 is the vehicle body, and the battery pack 10 is located at the bottom of the vehicle body, providing electrical power for the vehicle's operation or the operation of its internal electrical components. However, in other embodiments, the electronic device 1 can also be a mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; the working part 11 can be a unit component capable of obtaining electrical power from the battery pack 10 and performing corresponding work, such as a fan blade rotation unit or a vacuum cleaner suction unit. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the aforementioned electronic device 1.

[0083] In summary, the cylindrical battery and battery pack proposed in this utility model feature a support portion between the current collector and the electrode assembly. This support portion fills at least a portion of the space between the current collector and the electrode assembly in the height direction, providing support force and ensuring close contact between the tabs, current collector, cover plate, and shell, forming a unified whole. Compared to existing technologies, under vibration conditions, the support portion can provide support for the current collector, limiting its deformation space and preventing desoldering or breakage due to excessive deformation. Furthermore, for the cylindrical battery, the force distribution changes from individual forces between two components to a unified force distribution, improving the resistance to weld pull between the tabs and current collector, as well as between the current collector and the shell, protecting the welded areas, and addressing the technical problem of current collector desoldering due to vibration in existing cylindrical batteries. This ultimately improves the battery's performance, lifespan, and safety.

[0084] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A cylindrical battery, characterized by comprising: include: A housing, the housing including surrounding sidewalls, one end of which is formed with an opening; An electrode assembly, housed within the housing, includes tabs facing the opening; A cover plate is connected to the housing and seals the opening. A current collector is disposed between the electrode assembly and the cover plate; the current collector includes a first connecting part and a second connecting part, the first connecting part is fixedly connected to the electrode tab, and a plurality of second connecting parts are disposed around the outer periphery of the first connecting part and are fixedly connected to the housing and / or the cover plate. Along the height direction of the cylindrical battery, a support portion is provided between the current collector and the electrode assembly. The support portion is located between the side wall of the housing and the tab, and is insulated from the electrode assembly.

2. The cylindrical battery according to claim 1, characterized by The end face of the electrode assembly facing the opening includes a central region and an edge region surrounding the central region, the central region protruding toward one side of the cover plate relative to the edge region; The second connecting portion protrudes toward the cover plate relative to the first connecting portion, and the supporting portion is disposed between the second connecting portion and the edge region, and abuts against the second connecting portion and / or the edge region.

3. The cylindrical battery according to claim 2, characterized by The sidewall includes a stepped portion, the stepped portion having a mating surface facing the cover plate, and the second connecting portion overlapping the mating surface; The first connecting part and the second connecting part are connected by a bent section, and the cover plate is provided with an inclined surface opposite to the bent section; The inclined surface presses against the bent section so that the second connecting portion abuts against the side wall.

4. The cylindrical battery according to any one of claims 1 to 3, characterized in that, The support portion is an elastic insulating component independent of the collector plate.

5. The cylindrical battery according to claim 4, characterized in that, The support portion includes an annular body and a plurality of ribs. The plurality of ribs are at least disposed on one side of the annular body near the second connecting portion. One side of the ribs is connected to the annular body, and the other side extends obliquely outward toward the sidewall. Among them, multiple ribs used to support the same portion near the second connection form a support section of the support portion.

6. The cylindrical battery according to claim 5, characterized in that, Multiple ribs are respectively disposed on both sides of the axial direction of the ring body, and the cross-section of the support part is a fishbone shape or a tree branch shape.

7. The cylindrical battery according to claim 4, characterized in that, The support portion includes multiple support sections that support multiple second connecting portions respectively, and a channel is provided between adjacent multiple support sections, the channel penetrating the support portion radially.

8. The cylindrical battery according to any one of claims 1 to 3, characterized in that, The support portion is a protrusion disposed on the collector plate and protruding to one side of the electrode assembly, and the protrusion has an insulating material on at least one surface near the electrode assembly; The protrusions are provided on the manifold by any one of the following methods: stamping, bonding, riveting, injection molding, or snap-fitting. At least one second connecting part is provided with one or more of the protrusions.

9. The cylindrical battery according to claim 8, characterized in that, The protrusion is a raised strip extending radially along the cylindrical battery, wherein: The protrusion abuts against the inner wall of the side wall of the housing; And / or, the second connecting portion protrudes toward the cover plate side relative to the first connecting portion, the second connecting portion is connected to the first connecting portion through a bent section, and the protrusion extends from the second connecting portion to the bent section.

10. A battery pack, characterized in that, Includes the cylindrical battery as described in any one of claims 1 to 9.

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