Battery packaging structure and battery

Abstract

The utility model provides a battery packaging structure and a battery, the battery packaging structure comprises a shell and a cover plate, the contact surface between the shell and the cover plate is an inclined surface, and the inclined surface and the shell form a certain inclination angle, so that during laser welding, the laser welding angle and the shell also form a certain inclination angle, the incident path of a laser beam and the shell form a certain inclination angle, and the laser welding efficiency is improved. Therefore, the incident path and the reflection path of the laser beam are not perpendicular to the shell any more, reflection of the laser beam is greatly reduced, meanwhile, the reflected laser beam cannot be reflected along the incident path, the laser lens cannot be damaged, and the service life of the laser lens is prolonged. The shell and the cover plate are fixed by welding and form the fusion welding structure, and the fusion welding structure extends along the inclined direction of the contact surface, so that the fusion welding structure at least partially covers the contact surface, the stable welding of the shell and the cover plate is ensured, and the structural stability and rigidity of the battery packaging structure are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a battery packaging structure and a battery. BACKGROUND

[0002] The cover plate and the shell of the cylindrical battery are usually laser welded. At present, the laser welding technology of the shell cover has been widely used and has achieved certain results. However, in order to enable the laser to better weld the connecting surface between the cover plate and the shell, the welding angle of the laser is consistent with the extension direction of the connecting surface, which makes the welding angle of the laser perpendicular to the shell, so that the incident path and the reflection path of the laser are also perpendicular to the shell, resulting in poor laser absorption rate and high reflectivity. A large amount of reflected laser will damage the laser lens and reduce the service life of the laser lens. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to provide a battery packaging structure and a battery to solve or partially solve the problems in the background art.

[0004] To achieve the above purpose, the first aspect of the present application provides a battery packaging structure, comprising: a shell and a cover plate, the shell is provided with an opening, the cover plate is used to close the opening, the contact surface between the shell and the cover plate is an inclined surface, the shell and the cover plate are fixed by welding and form a fusion welding structure, and the fusion welding structure extends along the inclined direction of the contact surface.

[0005] Optionally, one end of the shell provided with the opening is an opening end, and the end face of the opening end comprises a first contact inclined surface close to the central axis of the shell and a flat surface connected with the first contact inclined surface.

[0006] The cover plate comprises a first connecting portion located at the outer periphery, the end face of the first connecting portion close to the shell comprises a second contact inclined surface and an overlapping end face, the second contact inclined surface is close to the central axis, and the second contact inclined surface is welded with the first contact inclined surface.

[0007] Optionally, the fusion welding structure covers the overlapping end face.

[0008] Optionally, in the radial direction of the shell, the outer diameter of the shell is greater than the outer diameter of the cover plate.

[0009] Optionally, the cover plate comprises a second connecting portion located at the outer periphery, the second connecting portion close to one side of the shell is provided with an annular accommodating groove, and the annular accommodating groove comprises a third contact inclined surface.

[0010] One end of the shell provided with the opening is an opening end, and the end face of the opening end is provided with a protruding portion, the protruding portion comprises a fourth contact inclined surface arranged away from the central axis of the shell, the protruding portion extends into the annular accommodating groove, and the fourth contact inclined surface is welded with the third contact inclined surface.

[0011] Optionally, the end face of the open end comprises a connecting end face, the connecting end face is located on the side of the protruding portion away from the central axis, and the second connecting portion covers the connecting end face.

[0012] Optionally, the fusion welding structure covers the connecting end face.

[0013] Optionally, in the radial direction of the shell, the outer diameter of the shell is smaller than the outer diameter of the cover plate.

[0014] Optionally, one end of the shell provided with the opening is an open end, the end face of the open end comprises a first contact inclined surface arranged close to the central axis of the shell, the cover plate is provided with a fifth contact inclined surface close to the side of the shell, and the first contact inclined surface and the fifth contact inclined surface are welded.

[0015] Optionally, in the height direction of the shell, the surface of the cover plate away from the opening is a first surface, and there is a height difference between the first surface and the end face of the open end in the height direction of the shell.

[0016] The second aspect of the present application provides a battery comprising the battery packaging structure and the electrode assembly of any one of the first aspect, the shell and the cover plate of the battery packaging structure form a containing space, and the electrode assembly is located in the containing space.

[0017] As can be seen from the above, the battery packaging structure and the battery provided by the present application comprise a shell and a cover plate, the contact surface between the shell and the cover plate is an inclined surface, the inclined surface forms a certain inclination angle with the shell, so that when laser welding is performed, the angle of laser welding also forms a certain inclination angle with the shell, which makes the incident path of the laser beam form a certain inclination angle with the shell, and further makes the reflection path also form a certain inclination angle with the shell, so that the incident path and the reflection path of the laser beam are no longer perpendicular to the shell, the incident light and the reflected light of the laser do not affect each other, greatly reducing the reflection of the laser beam, and at the same time, the reflected laser beam does not reflect along the same angle as the incident path, so it will not damage the laser lens, prolonging the service life of the laser lens; the shell and the cover plate are fixed by welding and form a fusion welding structure, the fusion welding structure extends along the inclination direction of the contact surface, so as to ensure that the fusion welding structure at least partially covers the contact surface, ensuring the stable welding of the shell and the cover plate, and improving the structural stability and rigidity of the battery packaging structure. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1A schematic view showing the welding of the existing cover plate and the shell is shown;

[0020] Figure 2 A schematic view showing the cross section of the battery packaging structure of the embodiment of the present application is shown;

[0021] Figure 3 A schematic view showing Figure 2 A first partial enlarged view of the A in the middle;

[0022] Figure 4 A schematic view showing Figure 2 A second partial enlarged view of the A in the middle;

[0023] Figure 5 A schematic view showing Figure 2 A third partial enlarged view of the A in the middle;

[0024] Figure 6 A schematic view showing the cross section of the battery of the embodiment of the present application.

[0025] In the figure: 1, cover plate; 11, fifth contact slope; 12, first connecting part; 121, second contact slope; 122, overlapping end surface; 123, vertical surface; 13, second connecting part; 131, third contact slope; 14, first surface; 2, shell; 21, open end; 211, first contact slope; 212, flat surface; 213, protruding part; 2131, fourth contact slope; 214, connecting end surface; 215, opening; 3, fusion welding structure; 4, electrode assembly. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0027] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those with ordinary skills in the art to which the present application belongs. The words "first", "second" and similar words used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The words "include" or "contain" and similar words mean that the components or objects before the words cover the components or objects listed after the words and their equivalents, and do not exclude other components or objects. The words "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The words "up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0028] Lithium ion batteries can be in the shape of a cylinder, a flat body, a cuboid or other shapes. Current lithium ion batteries generally include a shell and an electrode assembly contained in the shell, and the shell is filled with an electrolyte. The electrode assembly is mainly formed by laminating or winding a first polar sheet and a second polar sheet, and a separator is generally provided between the first polar sheet and the second polar sheet. The part of the first polar sheet and the second polar sheet coated with active material constitutes the main body of the electrode assembly, and the part of the first polar sheet and the second polar sheet not coated with active material respectively constitutes the first and second polar tabs. In the lithium ion battery, the first polar sheet can be a positive polar sheet, which includes a positive current collector and positive active material layers provided on both sides of the positive current collector, and the material of the positive current collector can be, for example, aluminum, and the positive active material can be, for example, lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc.; the second polar sheet can be a negative polar sheet, which includes a negative current collector and negative active material layers provided on both sides of the negative current collector, and the material of the negative current collector can be, for example, copper, and the negative active material can be, for example, graphite or silicon, etc.

[0029] The first polar tab and the second polar tab can be located at one end of the main body together or at two ends of the main body respectively. In the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the polar tabs connect the electrode terminals to form a current loop.

[0030] For a cylindrical battery, the conventional design is that the first polar tab and the second polar tab are located at two ends of the battery respectively. Taking the first polar tab as the positive polar tab and the second polar tab as the negative polar tab as an example, the positive polar tab is connected with the positive adapter tab, and the negative polar tab is connected with the negative adapter tab.

[0031] In actual assembly, the shell and the polar post are usually welded first, and then the two ends of the electrode assembly are welded with the positive adapter tab and the negative adapter tab respectively to form an integral whole, the integral whole is put into the shell, the positive adapter tab and the part of the polar post extending into the shell are in contact, and then laser welding is performed to realize the welding of the shell, the polar post, the positive adapter tab, the electrode assembly and the negative adapter tab. Then, the cover plate is welded with the shell, and the cover plate is also welded with the negative adapter tab, and finally the assembly of the entire cylindrical battery is completed.

[0032] The cover plate and the shell of the cylindrical battery are usually laser welded. At present, the laser welding technology of the shell cover has been widely used and has achieved certain results.

[0033] Figure 1 A schematic view of the welding of the existing cover plate 1 and shell 2 is shown. Referring to Figure 1As shown, the existing cover plate 1 is directly welded with the open end face of the shell 2, that is, the connecting surface of the two is perpendicular to the shell 2. Thus, when laser welding is performed on the cover plate 1 and the shell 2, in order to enable the laser to better weld the connecting surface, the welding angle of the laser is consistent with the extension direction of the connecting surface, which makes the welding angle of the laser also perpendicular to the shell 2. However, when the incident path (i.e., the path shown by the red arrow in the figure) of the laser is perpendicular to the shell 2, the reflection path (i.e., the path shown by the green arrow in the figure) of the laser is also perpendicular to the shell 2, which causes the incident light and the reflected light of the laser to affect each other, resulting in poor laser absorption and high reflectivity. Poor laser absorption affects the welding yield, and a large amount of reflected laser light damages the laser lens and reduces the service life of the laser lens. Figure 1 Figure 1 Therefore, there is an urgent need to provide a new welding structure of the cover plate 1 and the shell 2 to improve the problems of poor laser absorption and high reflectivity, thereby prolonging the service life of the laser lens.

[0034] Therefore, there is an urgent need to provide a new welding structure of the cover plate 1 and the shell 2 to improve the problems of poor laser absorption and high reflectivity, thereby prolonging the service life of the laser lens.

[0035] Based on this, the application also provides a battery packaging structure.

[0036] Figure 2 A cross-sectional schematic view of the battery packaging structure of the embodiment of the application is shown, Figure 3 a first kind of partial enlarged view of A in the figure is shown. Figure 2

[0037] As shown in the figures, Figure 2 and Figure 3 The battery packaging structure provided by the application comprises a shell 2 and a cover plate 1, the shell 2 is provided with an opening 215, the cover plate 1 is used to close the opening 215, the contact surface between the shell 2 and the cover plate 1 is an inclined surface, the shell 2 and the cover plate 1 are fixed by welding and form a fusion welding structure 3, and the fusion welding structure 3 extends along the inclined direction of the contact surface.

[0038] Specifically, the shell 2 is provided with an opening 215, the cover plate 1 is used to close the opening 215, and the shell 2 and the cover plate 1 jointly form a sealed containing space for containing the electrode assembly of the battery.

[0039] The contact surface between the shell 2 and the cover plate 1 is an inclined surface, and the shell 2 and the cover plate 1 are fixed by welding. When laser welding is used to weld the shell 2 and the cover plate 1, as shown in the figure, Figure 3 the welding angle of the laser beam is consistent with the inclination angle of the inclined surface, so that after welding, the shell 2 and the cover plate 1 form a fusion welding structure 33, and the fusion welding structure 33 extends along the inclined direction of the contact surface.

[0040] ​​Since the contact surface between the housing 2 and the cover plate 1 is an inclined plane, and the inclined plane forms a certain angle with the housing 2, the laser welding angle also forms a certain angle with the housing 2 during laser welding. This results in the incident path of the laser beam (i.e., Figure 3 The path indicated by the red arrow in the middle is tilted at a certain angle to the shell 2, thus making its reflection path (i.e. Figure 3 The path indicated by the green arrow will also be at a certain angle to the housing 2. In this way, the incident path and the reflection path of the laser beam are no longer perpendicular to the housing 2. The incident light and the reflected light of the laser will not affect each other, greatly reducing the reflection of the laser beam. At the same time, the reflected laser beam will not be reflected at the same angle as the incident path, so it will not damage the laser lens and extend the service life of the laser lens.

[0041] The housing 2 and the cover plate 1 are fixed by welding to form a fusion welding structure 33. The fusion welding structure 33 extends along the inclined direction of the contact surface, which can ensure that the fusion welding structure 33 at least partially covers the contact surface, ensuring a stable weld between the housing 2 and the cover plate 1, and improving the structural stability and rigidity of the battery packaging structure.

[0042] In some embodiments, see continue to see Figure 2 and Figure 3 As shown, one end of the housing 2 with an opening 215 is designated as an open end 21, and the end face of the open end 21 includes a portion close to the central axis of the housing 2 (i.e., Figure 2 The first contact slope 211 and the straight surface 212 connected to the first contact slope 211 are provided (as shown in P).

[0043] The cover plate 1 includes a first connecting part 12 located on the outer periphery. The end face of the first connecting part 12 near the housing 2 includes a second contact slope 121 and an overlapping end face 122. The second contact slope 121 is located near the central axis. The second contact slope 121 is welded to the first contact slope 211, and the overlapping end face 122 is welded to the flat surface 212.

[0044] Specifically, one end of the housing 2 with the opening 215 is designated as the opening end 21, and the end face of the opening end 21 includes a portion close to the central axis of the housing 2 (i.e., Figure 2 As shown in Figure P, a first contact slope 211 is provided, which is inclined. A second contact slope 121 is welded to the first contact slope 211. In this way, it can be ensured that the contact surface between the housing 2 and the cover plate 1 is inclined, so that the laser can perform laser welding along the inclined direction of the slope during laser welding, thereby making the laser incident path (i.e. Figure 3 The path indicated by the red arrow in the middle has a certain tilt angle with the shell 2, which makes its reflection path (i.e. Figure 3The laser beam reflected by the first contact inclined surface 211 and the second contact inclined surface 121 will also be at a certain angle of inclination with the shell 2, so that the incident light and the reflected light of the laser beam will not interfere with each other, greatly reducing the reflection of the laser beam and increasing the absorption rate of the laser beam, thereby improving the welding effect. At the same time, the reflected laser beam will not be reflected along the same angle as the incident path, so it will not damage the laser lens and prolong the service life of the laser lens.

[0045] The flat surface 212 is located on the side of the first contact inclined surface 211 away from the center axis, and the flat surface 212 extends horizontally along the radial direction of the shell 2.

[0046] The lap end surface 122 is welded with the flat surface 212, and the flat surface 212 is located on the side of the first contact inclined surface 211 away from the center axis, and the lap end surface 122 is located on the side of the second contact inclined surface 121 away from the center axis, that is, the flat surface 212 and the lap end surface 122 are located on the outer periphery of the contact surface (the first contact inclined surface 211 and the second contact inclined surface 121) of the cover plate 1 and the shell 2. Therefore, the welding of the lap end surface 122 and the flat surface 212 can ensure the close connection of the lap end surface 122 of the first connecting portion 12 and the flat surface 212 of the opening end 21, and further ensure the close connection of the outer periphery of the contact surface of the cover plate 1 and the shell 2, thereby improving the sealing performance of the battery packaging structure.

[0047] In some embodiments, the fusion welding structure 3 covers the lap end surface 122.

[0048] Specifically, the lap end surface 122 is the first position to be welded when the cover plate 1 is welded with the shell 2, and it is also the outermost part of the position where the shell 2 is connected with the cover plate 1. Therefore, covering the lap end surface 122 with the fusion welding structure 33 can ensure that the lap end surface 122 is completely welded, which can ensure the close connection of the outermost part of the cover plate 1 and the shell 2, thereby improving the structural strength and sealing performance of the battery packaging structure.

[0049] In some embodiments, in the radial direction of the shell 2, the outer diameter of the shell 2 is greater than the outer diameter of the cover plate 1.

[0050] Specifically, the radial direction of the shell 2 is the direction indicated by B in the following figure. Figure 3

[0051] ​In the radial direction of the housing 2, the outer diameter of the housing 2 is larger than the outer diameter of the cover plate 1. That is, the outer diameter of the housing 2 is larger and the outer diameter of the cover plate 1 is smaller. The cover plate 1 cannot completely cover the end face of the opening end 21 of the housing 2. At the same time, since the first connecting part 12 of the cover plate 1 overlaps the end face of the opening end 21, a step structure can be formed between the outermost end face of the cover plate 1 (i.e. the end face outside the first connecting part 12) and the end face of the opening end 21 of the housing 2. The step structure is conducive to the laser entering the connection surface between the cover plate 1 and the housing 2, which is conducive to the formation of the fusion welding structure 33. In addition, the step structure can block the reflected light of the laser to reduce the reflectivity of the laser and increase the absorption rate of the laser, thereby reducing the damage of the reflected light of the laser to the laser lens and improving the welding quality.

[0052] Figure 4 It shows Figure 2 The second type of enlarged schematic diagram of part A.

[0053] In some embodiments, see Figure 4 As shown, the cover plate 1 includes a second connecting part 13 located on the outer periphery. The second connecting part 13 is provided with an annular receiving groove on the side near the housing 2. The annular receiving groove includes a third contact slope 131.

[0054] The end of the housing 2 with the opening 215 is the opening end 21. The end face of the opening end 21 is provided with a protrusion 213. The protrusion 213 includes a fourth contact slope 2131 disposed away from the central axis of the housing 2. The protrusion 213 extends into the annular receiving groove and the fourth contact slope 2131 is welded to the third contact slope 131.

[0055] Specifically, the protrusion 213 extends into the annular receiving groove, so that the protrusion 213 and the second connecting part 13 form an interlocking structure, which can ensure the connection stability of the second connecting part 13 and the protrusion 213, thereby ensuring the connection stability of the housing 2 and the cover plate 1, and ensuring the structural strength of the battery packaging structure.

[0056] The fourth contact slope 2131 is welded to the third contact slope 131. This ensures that the contact surface between the housing 2 and the cover plate 1 is sloped, allowing the laser to weld along the slope's inclination direction during laser welding, thus improving the laser's incident path (i.e., Figure 4 The path indicated by the red arrow in the middle) and the reflection path (i.e. Figure 4 The path indicated by the green arrow in the middle has a certain tilt angle with the shell 2, which can reduce the reflectivity of the laser beam during the welding process, thereby reducing the damage of reflected light to the laser lens, and improving the absorption rate of the laser beam, thus improving the welding effect.

[0057] In some embodiments, see continue to see Figure 4As shown, the end surface of the open end 21 comprises a connecting end surface 214, which is located on the side of the protruding portion 213 away from the central axis, and the second connecting portion 13 covers the connecting end surface 214.

[0058] Specifically, the second connecting portion 13 covering the connecting end surface 214 can be that the second connecting portion 13 covers the entire connecting end surface 214, or that the second connecting portion 13 covers part of the connecting end surface 214. The connecting end surface 214 is located on the side of the protruding portion 213 away from the central axis, that is, the connecting end surface 214 is located on the outer periphery of the contact surface (the fourth contact inclined surface 2131 and the third contact inclined surface 131) of the cover plate 1 and the shell 2. In this way, the second connecting portion 13 covering the connecting end surface 214 can ensure that the second connecting portion 13 is tightly connected with the connecting end surface 214, and further ensure that the outer periphery of the contact surface of the cover plate 1 and the shell 2 is tightly connected, thereby improving the sealing performance of the battery packaging structure.

[0059] In some embodiments, continuing to refer to Figure 4 , the fusion welding structure 3 covers the connecting end surface 214.

[0060] Specifically, the connecting end surface 214 is the position where welding is first performed when the cover plate 1 and the shell 2 are welded, and is also the outermost part of the position where the shell 2 and the cover plate 1 are connected. Therefore, the fusion welding structure 33 covering the connecting end surface 214 can ensure that the connecting end surface 214 is completely welded, which can ensure that the outermost part of the cover plate 1 and the shell 2 is tightly connected, thereby improving the structural strength and sealing performance of the battery packaging structure.

[0061] In some embodiments, continuing to refer to Figure 4 , in the radial direction of the shell 2, the outer diameter of the shell 2 is smaller than the outer diameter of the cover plate 1.

[0062] Specifically, the radial direction of the shell 2 is the direction shown by B in Figure 4 .

[0063] In the radial direction of the shell 2, the outer diameter of the shell 2 is smaller than the outer diameter of the cover plate 1, that is, the outer diameter of the shell 2 is smaller, and the outer diameter of the cover plate 1 is larger. The cover plate 1 completely covers the end surface of the open end 21 of the shell 2 and still has a part extending outward. In this way, in the radial direction of the shell 2, the part of the cover plate 1 extending outward and the outer side of the shell 2 form a stepped structure. The stepped structure is conducive to the laser entering the connecting surface of the cover plate 1 and the shell 2, is conducive to the formation of the fusion welding structure 33, and can shield the reflected light of the laser to reduce the reflectivity of the laser and improve the absorption rate of the laser, thereby reducing the damage of the reflected light of the laser to the lens of the laser, and improving the welding quality.

[0064] Figure 5 A third partial enlarged view of A in Figure 2 is shown.

[0065] In some embodiments, see Figure 5 As shown, the end of the housing 2 with the opening 215 is the opening end 21. The end face of the opening end 21 includes a first contact slope 211 located near the central axis of the housing 2. The cover plate 1 has a fifth contact slope 11 located on the side near the housing. The first contact slope 211 and the fifth contact slope 11 are welded together.

[0066] In the height direction of the housing 2, the surface of the cover plate 1 away from the opening is the first surface 14, and there is a height difference between the first surface 14 and the end face of the opening end 21 in the height direction of the housing 2.

[0067] Specifically, the welding of the first contact slope 211 and the fifth contact slope 11 ensures that the contact surface between the housing 2 and the cover plate 1 is a slope, allowing the laser to perform laser welding along the inclination direction of the slope, thereby improving the laser's incident path (i.e. Figure 5 The path indicated by the red arrow in the middle) and the laser reflection path (i.e. Figure 5 The paths indicated by the green arrows in the middle are all at a certain angle to the shell 2, which can reduce the reflectivity of the laser beam during the welding process, thereby reducing the damage of reflected light to the laser lens, and improving the absorption rate of the laser beam, thus improving the welding effect.

[0068] In the height direction of shell 2 (i.e. Figure 5 As shown in the direction of C), there is a height difference between the first surface 14 and the end face of the opening end 21. In this way, a step structure can be formed between the first surface 14 and the end face of the opening end 21. The step structure is conducive to the laser entering the connection surface between the cover plate 1 and the shell 2, which is conducive to the formation of the fusion welding structure 33. Furthermore, the step structure can block the reflected light of the laser to reduce the reflectivity of the laser, increase the absorption rate of the laser, thereby reducing the damage of the reflected light of the laser to the laser lens and improving the welding quality.

[0069] It is worth noting that the height difference between the first surface 14 and the end face of the opening end 21 can be either that the first surface 14 is higher than the end face of the opening end 21 (i.e., the first surface 14 protrudes from the end face of the opening end 21) or that the first surface 14 is lower than the end face of the opening end 21 (i.e., the end face of the opening end 21 protrudes from the first surface 14). In both cases, a stepped structure can be formed between the first surface 14 and the end face of the opening end 21, which is beneficial to reducing the reflectivity of the laser.

[0070] Figure 6 A cross-sectional schematic diagram of a battery according to an embodiment of this application is shown.

[0071] See Figure 6As shown, the battery includes the battery packaging structure and the electrode assembly 4 of any of the above embodiments, the housing 2 and the cover plate 1 of the battery packaging structure form a containing space, and the electrode assembly 4 is located in the containing space, and the containing space also contains an electrolyte.

[0072] In particular, the battery is used to provide electric energy for an electric device. The battery can be used as a power supply of the electric device, or can be used as an energy storage unit of the electric device. The electric device can include a mobile device (such as a mobile phone, a notebook computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship and a satellite, an energy storage system, etc., but is not limited thereto.

[0073] The battery has the technical effects of any of the above embodiments, which are not described herein.

[0074] It should be understood by those skilled in the art that the above discussion of any of the embodiments is only exemplary, and is not intended to imply that the scope (including claims) of the present application is limited to these examples; the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of the different aspects of the present application as described above. In order to be brief, they are not provided in details.

[0075] Embodiments of the present application are intended to cover all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery packaging structure, characterized by, The application relates to a battery packaging structure, which comprises a shell and a cover plate, the shell is provided with an opening, the cover plate is used for closing the opening, the contact surface between the shell and the cover plate is an inclined surface, the shell and the cover plate are fixed by welding and are provided with a fusion welding structure which extends along the inclined direction of the contact surface.

2. The battery packaging structure of claim 1, wherein, One end of the shell provided with the opening is an opening end, and the end surface of the opening end comprises a first contact inclined surface which is arranged close to the central axis of the shell and a flat surface which is connected with the first contact inclined surface. The cover plate comprises a first connecting part which is arranged at the outer periphery, the first connecting part comprises a second contact inclined surface and an overlapping end surface, the second contact inclined surface is arranged close to the central axis, the second contact inclined surface is welded with the first contact inclined surface, and the overlapping end surface is welded with the flat surface.

3. The battery packaging structure of claim 2, wherein, The fusion welding structure covers the overlapping end surface.

4. The battery packaging structure of claim 2, wherein, In the radial direction of the shell, the outer diameter of the shell is larger than the outer diameter of the cover plate.

5. The battery packaging structure of claim 1, wherein, The cover plate comprises a second connecting part which is arranged at the outer periphery, the second connecting part is provided with an annular accommodating groove which is arranged close to one side of the shell, and the annular accommodating groove comprises a third contact inclined surface. One end of the shell provided with the opening is an opening end, and the end surface of the opening end is provided with a protruding part, the protruding part comprises a fourth contact inclined surface which is arranged away from the central axis of the shell, the protruding part extends into the annular accommodating groove, and the fourth contact inclined surface is welded with the third contact inclined surface.

6. The battery packaging structure of claim 5, wherein, The end surface of the opening end comprises a connecting end surface which is arranged on the side of the protruding part which is away from the central axis, and the second connecting part covers the connecting end surface.

7. The battery packaging structure of claim 6, wherein, The fusion welding structure covers the connecting end surface.

8. The battery packaging structure of claim 5, wherein, In the radial direction of the shell, the outer diameter of the shell is smaller than the outer diameter of the cover plate.

9. The battery packaging structure of claim 1, wherein, One end of the shell provided with the opening is an opening end, and the end surface of the opening end comprises a first contact inclined surface which is arranged close to the central axis of the shell, the cover plate is provided with a fifth contact inclined surface which is arranged close to one side of the shell, and the first contact inclined surface and the fifth contact inclined surface are welded. In the height direction of the shell, the surface of the cover plate which is away from the opening is a first surface, and the first surface and the end surface of the opening end have a height difference in the height direction of the shell.

10. A battery which comprises the battery packaging structure and an electrode assembly according to any one of claims 1 to 9, the shell and the cover plate of the battery packaging structure form an accommodating space, and the electrode assembly is arranged in the accommodating space.

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