Battery case, battery cell, battery device and power utilization device

Abstract

The utility model discloses a battery shell, a battery monomer, a battery device and a power utilization device, and relates to the technical field of batteries. According to the battery shell, the connection strength of the end cover and the shell can be improved, and the surface quality of the battery shell can be improved. The battery shell comprises a shell body and an end cover, wherein a shell body of the shell is provided with a shell opening, the edge of the shell opening in the shell body forms a shell flange, and a flange cavity is formed between the shell flange and the shell body; a cover flange is formed at the edge of a cover body of the end cover, the end cover is buckled with the shell, an extension part of the cover flange is connected with a first side surface, far away from the shell body, of the shell flange, and a winding part of the cover flange extends to the flange cavity through the shell flange; the extending part is the part, close to the cover body, of the cover flange, and the winding part is the part, connected with the extending part and far away from the cover body, of the cover flange. The battery shell provided by the utility model is used for the battery monomer.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery casings, battery cells, battery devices, and electrical devices. Background Art

[0002] Batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0003] Lightweighting batteries helps improve their mass energy density, and to balance battery life, the thickness of battery casings is being reduced to an extreme. However, the reduction in battery casing thickness dramatically increases the difficulty of welding the casing. In related art, the connection between the battery casing shell and the end cap is first welded, and then the excess is cut off to improve welding quality. However, the cut surface often contains burrs and other impurities, which not only affects the weld strength but also the surface quality of the battery casing. Utility Model Content

[0004] The present application provides a battery casing, a battery cell, a battery device, and an electrical device, which can improve the connection strength between the end cover and the shell, and can improve the surface quality of the battery casing.

[0005] The first aspect of the present application provides a battery housing, comprising: a shell and an end cap. The shell body of the shell has a shell opening, the edge of the shell opening on the shell body forming a shell flange, and a flange cavity is defined between the shell flange and the shell body; the edge of the cover body of the end cap forms a cover flange, the end cap and the shell body are fastened together, an extension of the cover flange is connected to a first side surface of the shell flange away from the shell body, and a winding portion of the cover flange extends through the shell flange to the flange cavity; the extension portion is the portion of the cover flange close to the cover body, and the winding portion is the portion of the cover flange connected to the extension portion and away from the cover body.

[0006] The battery housing provided by the present application has a shell flange provided on the shell body and a cover flange provided on the cover body, so that the extension of the cover flange can be fixedly connected to the shell flange, such as by welding, bonding, etc. Because there is a flange cavity between the shell flange and the shell body, that is, there is a gap between the shell flange and the shell body, the impact on the shell body and the electrode assembly located within the shell can be reduced during the process of fixing the extension to the shell flange. In addition, the winding portion of the cover flange is extended through the shell flange to the flange cavity, so that the cover flange can be hooked on the shell flange, which is beneficial to improving the connection strength between the end cap and the shell; at the same time, the edge of the cover flange can be abutted against the shell body or located at the opening of the flange cavity, which can reduce the cutting process of the shell flange and / or the cover flange, and can also reduce the occurrence of burrs and other problems on the battery housing, thereby improving the surface quality of the battery housing. Therefore, the battery housing provided by the present application can improve the connection strength between the end cap and the shell and improve the surface quality of the battery housing.

[0007] In a possible implementation of the present application, at least a portion of the region adjacent to the cover flange and the shell flange is welded.

[0008] In the technical solution of the present application, by welding at least a portion of the adjacent areas of the cover flange and the shell flange, not only is a good sealing connection formed between the shell and the end cap, but a reliable fixed connection is also formed between the cover flange and the shell flange. In this way, the cover flange and the shell flange are not only hooked but also welded, thereby further improving the connection strength between the shell and the end cap.

[0009] In a possible implementation of the present application, the first side surface is welded to the cover flange.

[0010] In the technical solution of the present application, since the first side surface of the shell flange and the cover flange are welded, not only can the shell flange and the cover flange be fixed and sealed, but the first side surface is located on the cover flange away from the shell body. When welding the first side surface and the cover flange, the heat generated by the welding can be kept away from the shell body, which is beneficial to reducing the impact of the heat generated by the welding on components such as the battery assembly located in the shell.

[0011] In a possible implementation of the present application, the orthographic projection of the welding area between the first side surface and the cover flange on the first side surface is located within the first side surface.

[0012] In the technical solution of the present application, since the welding area between the first side surface and the cover flange is located within the first side surface in the positive projection of the first side surface, the bent parts on the shell flange and the cover flange can be made not to overlap with the welding area, thereby reducing the impact on the weld when the cover flange and the shell flange are folded and rolled after welding, and the welding area can be made away from the shell body.

[0013] In a possible implementation of the present application, the extension portion is connected to the cover body through the cover bending portion, the shell flange is connected to the shell body through the shell bending portion, and the cover bending portion abuts against the shell bending portion.

[0014] In the technical solution of the present application, since a cover bend is provided between the extension portion and the cover body, the width of the flange cavity can be determined by adjusting the width of the cover bend. Furthermore, the shell bend and the cover bend abut against each other, allowing the end cap to be pressed against the shell via the cover bend and the shell bend, or allowing the force acting on the end cap to be transmitted to the shell via the cover bend and the shell bend, thereby facilitating the reduction of the force required to be borne by the weld area between the cover flange and the shell flange.

[0015] In a possible implementation of the present application, the winding portion is bonded to the shell body.

[0016] In the technical solution of the present application, since the winding part is bonded to the shell body, not only can a fixed connection between the winding part and the shell be achieved, but the cover flange and the shell body can also be sealed, thereby improving the connection strength and sealing between the shell and the end cover.

[0017] In a possible implementation of the present application, the cover flange is bonded to the shell flange.

[0018] In the technical solution of the present application, the cover flange and the shell flange are bonded together, which not only fixes the end cover to the shell, but also seals the gap between the shell and the cover, thereby improving the connection strength and sealing between the shell and the end cover.

[0019] A second aspect of the present application provides a battery cell comprising: an electrode assembly, an electrode terminal, and a battery housing provided by any one of the first aspects above. The electrode assembly is mounted within a housing formed by the housing and an end cap; the battery housing has a first through-hole; and the electrode terminal is connected to the electrode assembly and extends through the first through-hole to the outside of the housing.

[0020] The battery cell provided in the present application includes the battery casing provided above, so that the battery casing in the battery cell can have a higher connection strength and improve the surface quality of the battery casing, which is conducive to reducing the hidden dangers of defects in the battery casing to the safety performance of the battery cell.

[0021] In a possible implementation of the present application, a first through hole is provided on a side wall of the shell along the length direction of the battery cell, and the electrode tab of the electrode assembly corresponds to the position of the first through hole.

[0022] In the technical solution of this application, since the first through hole is provided on the side wall of the housing, the first through hole can be conveniently processed using the side wall of the housing. Furthermore, the tab can be provided in a flat structure along the length of the battery cell, which helps to reduce the volume occupied by the tab along the length of the battery cell, thereby facilitating an increase in the energy density of the battery cell.

[0023] In a possible implementation of the present application, the battery cell further includes a bracket, which matches the tab of the electrode assembly. The tab abuts against the bracket, and the bracket provides support for the tab.

[0024] In the technical solution of the present application, since a bracket matching the tab is provided in the battery cell, the bracket is set at a position corresponding to the tab in the battery casing. The bracket can not only limit and fix the electrode assembly, but also provide support for the tab, which is beneficial to reduce the deformation of the tab due to external force.

[0025] In a possible implementation of the present application, the battery cell further includes a fixing member having a second through hole matching the electrode terminal. The fixing member is located on a side of the end cover away from the shell, and the electrode terminal passes through the second through hole to connect with the fixing member.

[0026] In the technical solution of the present application, since a fixing part is provided for the electrode terminal and is located outside the shell, the end of the electrode terminal away from the tab can be fixedly connected to the fixing part to achieve a fixed connection between the electrode terminal and the shell, thereby fixing and limiting the electrode terminal.

[0027] In a possible implementation of the present application, the battery cell further includes a pressure relief mechanism, which is disposed on the housing and is used to discharge substances in the accommodating cavity.

[0028] In the technical solution of the present application, since a pressure relief mechanism is provided on the shell of the battery housing, when the pressure and temperature inside the battery cell reach a preset threshold value, an opening or channel for releasing the pressure or temperature inside the battery cell can be formed through the pressure relief mechanism, thereby enabling the battery cell to release pressure and temperature under controllable pressure or temperature, thereby reducing the occurrence of potentially more serious accidents.

[0029] In a possible implementation of the present application, the battery cell further includes a third insulating member, which is coated on the electrode assembly and is used to isolate the current between the electrode assembly and the battery housing.

[0030] In the technical solution of this application, since the third insulating member is coated on the electrode assembly, the third insulating member can reduce the risk of scratches on the electrode assembly during the assembly of the battery cell. The third insulating member can also isolate the electrode assembly from the battery casing, thereby providing good insulation protection for the electrode assembly.

[0031] The third aspect of the present application provides a battery device, comprising: a housing and the battery cell provided in the second aspect, wherein the housing has an installation cavity; the battery cell is disposed in the installation cavity.

[0032] The battery device provided in the present application, since it includes the battery cells provided above, can make the battery casing in the battery cells have a higher connection strength and can improve the surface quality of the battery casing, which is conducive to reducing the hidden dangers caused by defects in the battery casing to the safety performance of the battery cells, thereby improving the safety performance of the battery cells and further improving the safety performance of the battery device.

[0033] A fourth aspect of the present application provides an electrical device, which includes the above-provided battery cell or battery device for providing electrical energy.

[0034] The electrical device provided in the present application includes the battery cell or electrical device provided above. Therefore, the battery shell in the battery cell can have a higher connection strength and the surface quality of the battery shell can be improved, which is conducive to reducing the hidden dangers of defects in the battery shell to the safety performance of the battery cell, thereby improving the safety performance of the battery cell and further improving the safety performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0036] Figure 1 A schematic diagram of the three-dimensional structure of a battery cell provided in this application;

[0037] Figure 2 A schematic top view of the battery cell provided in this application;

[0038] Figure 3 Provided for this application Figure 2 Schematic cross-sectional view along CC direction;

[0039] Figure 4 Provided for this application Figure 3 A partial enlarged schematic diagram of part D in the middle;

[0040] Figure 5 A schematic diagram of the assembly structure of the battery cell provided in this application;

[0041] Figure 6 Schematic diagram of the decomposition structure of the battery cell provided in this application Figure 1 ;

[0042] Figure 7 Schematic diagram of the decomposition structure of the battery cell provided in this application Figure 2 ;

[0043] Figure 8 A schematic diagram of the exploded structure of the battery device provided in this application;

[0044] Figure 9 This is a schematic diagram of the structure of the electrical device provided in this application.

[0045] Description of reference numerals:

[0046] 1-battery housing; 11-shell; 111-shell body; 112-shell opening; 113-shell flange; 1131-first side; 1132-second side; 114-flange cavity; 115-shell bend; 116-accommodation groove; 12-end cover; 121-cover body; 122-cover flange; 1221-extension portion; 1222-winding portion; 123-cover bend; 13-welding area; 14-first through hole; 2- Electrode assembly; 21-ear; 22-first sub-electrode assembly; 23-second sub-electrode assembly; 3-electrode terminal; 4-bracket; 5-fixing part; 61-first insulating part; 7-adapter; 8-pressure relief mechanism; 81-support member; 9-third insulating part; 100-battery device; 101-battery cell; 102-housing; 103-cover; 200-controller; 300-motor; Y-thickness direction; Z-length direction. DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0049] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0050] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0052] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0055] Currently, new energy batteries are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in a variety of fields such as aerospace. As the application of power batteries continues to expand, market demand is also growing.

[0056] A battery generally includes a shell and components such as an electrode assembly housed in the shell. The battery shell is generally configured to include a shell and an end cover. During the battery assembly process, the electrode assembly and the like are placed in the shell, and the end cover is then sealed and connected to the shell. In the related art, the shell and the end cover are sealed and connected by welding or the like. For shells and end covers with thinner thicknesses, excess portions are usually left for the welded portions on the shell and the end cover, and the excess portions at the edge of the weld are cut off after welding to improve the weld strength. However, the cutting process will not only affect the strength of the weld, but will also cause burrs to appear on the cut surface after cutting, and the presence of burrs will bring greater safety hazards to the battery itself and the devices around the battery. Therefore, the connection method of the shell and the end cover in the related art will reduce the connection strength of the shell and the end cover, and will have an adverse effect on the surface quality of the battery shell.

[0057] The present application embodiment provides a battery housing, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , Figure 1 This is a schematic diagram of the three-dimensional structure of the battery cell provided in this application. Figure 2 This is a schematic diagram of the top view of the battery cell provided in this application. Figure 3 Provided for this application Figure 2 Schematic cross-sectional view along CC direction, Figure 4 Provided for this application Figure 3 A partial enlarged schematic diagram of part D in the middle. Figure 5 This is a schematic diagram of the assembly structure of the battery cell provided in this application. Figure 6 Schematic diagram of the decomposition structure of the battery cell provided in this application Figure 1 .

[0058] The battery housing 1 provided in the embodiment of the present application includes: a shell 11 and an end cap 12. The shell body 111 of the shell 11 has a shell opening, the edge of the shell opening on the shell body 111 forms a shell flange 113, and a flange cavity 114 is defined between the shell flange 113 and the shell body 111. The edge of the cover body 121 of the end cap 12 forms a cover flange 122. The end cap 12 is fastened to the shell 11. The extension 1221 of the cover flange 122 is connected to the first side surface 1131 of the shell flange 113 away from the shell body 111. The winding portion 1222 of the cover flange 122 extends through the shell flange 113 to the flange cavity 114. The extension 1221 is the portion of the cover flange 122 close to the cover body 121, and the winding portion 1222 is the portion of the cover flange 122 connected to the extension 1221 and away from the cover body 121.

[0059] In the embodiment of the present application, the housing 11 and the end cap 12 are fastened together to form a battery housing 1 having a receiving cavity, and components such as the electrode assembly 2 can be installed in the receiving cavity. The housing can be a steel housing, an aluminum housing, a composite metal housing (such as a copper-aluminum composite housing), etc. In other words, the housing 11 and the end cap 12 can be made of materials such as copper and aluminum.

[0060] In the embodiment of this application, Figure 6 As shown, the shell 11 can be set to a box-like structure with an opening, that is, the shell body 111 part of the shell 11 can be enclosed to form a receiving groove 116, and the shape of the receiving groove 116 can be set according to the shape of the electrode assembly 2 in the battery cell. In addition, a shell flange 113 can be set at the edge of the shell opening 112 on the shell body 111 to fix and seal the shell 11 and the end cover 12 through the shell flange 113 ( Figure 6 The shell flange 113 shown in FIG is a state where the shell 11 and the end cover 12 are not completely assembled).

[0061] For example, Figure 4 As shown, the shell flange 113 can be parallel to the shell body 111, that is, the shell flange 113 is folded 180 degrees from the edge of the shell opening 112 on the shell body 111 and then extends to a position adjacent to the shell body 111. A gap can be provided between the shell flange 113 and the shell body 111, thereby forming a flange cavity 114 between the shell flange 113 and the shell body 111.

[0062] In the embodiment of this application, Figure 6 As shown, corresponding to the shell flange 113, a cover flange 122 ( Figure 6The cover flange 122 shown in the figure is a state in which the housing 11 and the end cap 12 are not completely assembled. The cover flange 122 matches the housing flange 113, and the width of the cover flange 122 can be made larger than the width of the housing flange 113. The cover flange 122 and the housing flange 113 can be sealed together to achieve a sealed connection between the housing 11 and the end cap 12.

[0063] For example, Figure 5 As shown, after the end cover 12 is fastened to the shell opening 112 of the shell 11, the shell flange 113 and the cover flange 122 can be fixedly connected and sealed. Figure 4 As shown, the sealed shell flange 113 and cover flange 122 are folded over to seal the shell 11 and end cap 12 together through the final flange structure. For example, the extension 1221 of the cover flange 122, which is close to the cover body 121, can be fitted and connected to the first side surface 1131 of the shell flange 113, which is away from the cover body 121. The extension 1221 and the first side surface 1131 can be fixedly connected by welding, bonding, or other methods. The portion of the cover flange 122 that is wider than the shell flange 113, i.e., the coiled portion 1222 of the cover flange 122, which is located at the extension 1221 and away from the cover body 121, can be folded around the free end of the shell flange 113 toward the shell body 111, so that the coiled portion 1222 extends past the free end of the shell flange 113, which is away from the shell body 111, to the opening of the flange cavity 114.

[0064] Another example, such as Figure 4 As shown, the width of the winding portion 1222 can be set according to the width of the flange cavity 114 and the thickness of the shell flange 113. For example, the width of the winding portion 1222 is set to be equal to the sum of the width of the flange cavity 114 and the thickness of the shell flange 113. In this way, the winding portion 1222 can pass through the opening of the flange cavity 114 and abut against the shell body 111, and the edge portion of the winding portion 1222 can also abut against the shell body 111. Alternatively, the width of the winding portion 1222 can be made greater than the sum of the width of the flange cavity 114 and the thickness of the shell flange 113, and then a part of the winding portion 1222 can be folded into the flange cavity 114 to connect the winding portion 1222 to the shell body 111. Alternatively, the width of the winding portion 1222 can be greater than or equal to the thickness of the shell flange 113, and smaller than the sum of the width of the flange cavity 114 and the thickness of the shell flange 113. Then, a part of the winding portion 1222 can be hooked on the shell flange 113 so that the free end of the winding portion 1222 is located at the opening of the flange cavity 114.

[0065] In the battery housing 1 provided in the embodiment of the present application, since the housing 11 is provided with a housing flange 113 and the cover flange 122 is provided on the cover body, the extension portion 1221 of the cover flange 122 can be fixedly connected to the housing flange 113, for example, by welding, bonding, etc. The extension portion 1221 is fixedly connected to the housing flange 113. Furthermore, because there is a flange cavity 114 between the housing flange 113 and the housing body 111, that is, there is a gap between the housing flange 113 and the housing body 111, the process of fixing the extension portion 1221 to the housing flange 113 can reduce the impact on the housing body 111, thereby reducing the impact on the electrode assembly 2 located within the housing 11. And the winding portion 1222 of the cover flange 122 is extended through the shell flange 113 to the flange cavity 114, so that the cover flange 122 can be hooked on the shell flange 113, which is beneficial to improving the connection strength between the end cover 12 and the shell 11; at the same time, the edge of the cover flange 122 can be abutted against the shell body 111 or located at the opening of the flange cavity 114, so that the cutting process of the shell flange 113 and / or the cover flange 122 can be reduced, and the occurrence of problems such as burrs on the battery shell 1 can be reduced, thereby helping to improve the surface quality of the battery shell 1. Therefore, the battery shell 1 provided in the embodiment of the present application can improve the connection strength between the end cover 12 and the shell 11, and can improve the processing quality of the battery shell 1.

[0066] In some possible embodiments of the present application, Figure 4 As shown, at least a portion of the cover flange 122 adjacent to the shell flange 113 is welded.

[0067] In the embodiment of the present application, the shell flange 113 and the cover flange 122 can be connected by welding to achieve a sealed connection and fixation between the shell flange 113 and the cover flange 122.

[0068] For example, the cover flange 122 and the shell flange 113 can be welded by laser welding, seam welding, ultrasonic welding, etc. Figure 5 and Figure 6 As shown, before the shell flange 113 and the cover flange 122 are rolled and folded, a portion of the adjacent area between the shell flange 113 and the cover flange 122 can be welded. For example, a portion of the area between the first side surface 1131 of the shell flange 113 and the cover flange 122 can be welded. After the welding is completed, the cover flange 122 and the shell flange 113 that are welded together can be folded to obtain the following Figure 4 The flange structure between the housing 11 and the end cover 12 is shown.

[0069] In the above embodiment, by welding at least a portion of the adjacent areas of the cover flange 122 and the shell flange 113, not only is a good sealing connection formed between the housing 11 and the end cap 12, but a reliable fixed connection is also formed between the cover flange 122 and the shell flange 113. Thus, the cover flange 122 and the shell flange 113 are not only hooked but also welded, thereby further improving the connection strength between the housing 11 and the end cap 12.

[0070] In some possible embodiments of the present application, Figure 4 As shown, the first side surface 1131 of the shell flange 113 is welded to the cover flange 122 .

[0071] In the embodiment of the present application, a portion of the adjacent area between the shell flange 113 and the cover flange 122 can be welded, while other adjacent areas between the shell flange 113 and the cover flange 122 can be abutted or connected by other means.

[0072] For example, the first side surface 1131 of the shell flange 113 and the extension portion 1221 of the cover flange 122 can be welded. The welding can be performed on all adjacent areas between the first side surface 1131 and the extension portion 1221, or on a portion of the adjacent areas between the first side surface 1131 and the extension portion 1221. The specific welding area 13 between the first side surface 1131 and the extension portion 1221 is not limited in this embodiment of the application.

[0073] In the above embodiment, due to the welding between the first side surface 1131 of the shell flange 113 and the cover flange 122, not only can the shell flange 113 and the cover flange 122 be fixed and sealed, but the first side surface 1131 is located on the cover flange 122 away from the shell body 111. When the first side surface 1131 and the cover flange 122 are welded, the heat generated by the welding can be kept away from the shell body 111, which is beneficial to reducing the impact of the heat generated by the welding on components such as the battery assembly located in the shell 11.

[0074] In some possible embodiments of the present application, Figure 4 As shown, the orthographic projection of the welding area 13 between the first side surface 1131 and the cover flange 122 on the first side surface 1131 is located within the first side surface 1131 .

[0075] In the embodiment of the present application, after welding the first side surface 1131 of the shell flange 113 and the extension portion 1221 of the cover flange 122, the area where the first side surface 1131 and the cover flange 122 are connected by welding is the welding area 13 (such as Figure 4 (shown by the thick black solid line in ).

[0076] For example, the weld area 13 between the first side surface 1131 and the cover flange 122 can be positioned away from the bend formed when the cover flange 122 and the shell flange 113 are folded and rolled. For example, in a direction perpendicular to the first side surface 1131, the orthographic projection of the weld area 13 between the first side surface 1131 and the cover flange 122 on the first side surface 1131 can be positioned within the first side surface 1131. In other words, the welded area on the first side surface 1131 does not extend beyond the first side surface 1131. In this way, no weld is formed on the portion of the shell 11 between the shell flange 113 and the shell body 111, nor is a weld formed on the rolled portion 1222 of the cover flange 122.

[0077] In the above embodiment, since the positive projection of the welding area 13 between the first side surface 1131 and the cover flange 122 is located within the first side surface 1131, the bent portions on the shell flange 113 and the cover flange 122 can be made not to overlap with the welding area 13, thereby reducing the impact on the weld when the cover flange 122 and the shell flange 113 are folded and rolled after welding, and can keep the welding area 13 away from the shell body 111.

[0078] In some possible embodiments of the present application, Figure 4 As shown, the extension portion 1221 is connected to the cover body 121 through the cover bending portion 123 , the shell flange 113 is connected to the shell body 111 through the shell bending portion 115 , and the cover bending portion 123 abuts against the shell bending portion 115 .

[0079] In an embodiment of the present application, a shell bending portion 115 can be provided between the shell flange 113 and the shell body 111, that is, the edge of the opening on the shell body 111 is first extended to form the shell bending portion 115, and then the portion of the shell bending portion 115 away from the shell body 111 is bent to obtain the shell flange 113. The angle between the shell bending portion 115 and the shell body 111 can be 90° or close to 90°. The angle between the shell flange 113 and the shell bending portion 115 can also be 90° or close to 90°. In this way, after two bends close to 90° between the shell body 111 and the shell flange 113, a flange cavity 114 can be formed between the shell flange 113 and the shell body 111, and the shell flange 113 and the shell body 111 can be made close to parallel.

[0080] In the embodiment of the present application, a cover bending portion 123 can be provided between the cover body 121 and the cover flange 122 of the cover body, corresponding to the shell bending portion 115. For example, the cover bending portion 123 can be parallel or nearly parallel to the extension direction of the cover body 121, and the cover bending portion 123 and the cover body 121 can be offset by a distance in a direction perpendicular to the cover body 121. The portion of the cover bending portion 123 away from the cover body 121 can be bent to form the cover flange 122, such as by bending the portion of the cover bending portion 123 away from the cover body 121 at 90° or nearly 90°.

[0081] It should be noted that, during the assembly of the battery housing 1 provided in the embodiment of the present application, Figure 6 and Figure 7 As shown, the shell bending portion 115 and the shell flange 113 can be in the same plane, and the cover bending portion 123 and the cover flange 122 can also be in the same plane. In this way, first snap the end cover 12 onto the shell opening 112 of the shell 11 so that the cover bending portion 123 and the shell bending portion 115 abut against each other; then weld the area between the shell flange 113 and the cover flange 122 that needs to be welded; then bend the cover flange 122 and the shell flange 113 together to obtain the following Figure 4 or Figure 5 Alternatively, the cover flange 122 and the shell flange 113 may be bent first to obtain the following structure: Figure 4 or Figure 5 The flange structure between the shell 11 and the cover is shown (at this time there is no fixed connection between the cover flange 122 and the shell flange 113); then the area between the cover flange 122 and the shell flange 113 that needs to be welded is welded.

[0082] In the above embodiment, since the cover bend portion 123 is provided between the extension portion 1221 and the cover body 121, the width of the flange cavity 114 can be determined by setting the width of the cover bend portion 123. Furthermore, the shell bend portion 115 and the cover bend portion 123 abut against each other, so that the end cover 12 can be pressed against the shell 11 via the cover bend portion 123 and the shell bend portion 115, or the force acting on the end cover 12 can be transmitted to the shell 11 via the cover bend portion 123 and the shell bend portion 115, thereby facilitating the reduction of the force required to be borne by the welded area 13 between the cover flange 122 and the shell flange 113.

[0083] In some possible embodiments of the present application, the winding portion 1222 is bonded to the shell body 111 .

[0084] In the embodiment of the present application, the cover flange 122 and the shell flange 113 can be fixedly connected by bonding, and a seal between the cover flange 122 and the shell flange 113 can be achieved by using adhesives, for example, epoxy sealant adhesives, polyurethane structural adhesives, acrylic structural adhesives, silicone, and high-temperature resistant hot melt adhesives.

[0085] For example, Figure 4 As shown, when the coiled portion 1222 extends into the flange cavity 114, the coiled portion 1222 can be bonded to the housing 11. For example, the coiled portion 1222 can be bonded to the second side surface 1132 of the housing flange 113 close to the housing body 111; the coiled portion 1222 can also be bonded to the housing body 111; or the coiled portion 1222 can be bonded to the second side surface 1132 and bonded to the housing body 111.

[0086] In the above embodiment, since the winding portion 1222 is bonded to the shell body 111, not only can a fixed connection between the winding portion 1222 and the shell body 11 be achieved, but also the cover flange 122 and the shell body 111 can be sealed, thereby improving the connection strength and sealing between the shell 11 and the end cover 12.

[0087] In some possible embodiments of the present application, the cover flange 122 is bonded to the shell flange 113 .

[0088] In the embodiment of this application, Figure 4 As shown, the cover flange 122 and the shell flange 113 can be bonded together while the rolled portion 1222 of the cover flange 122 abuts against the shell body 111 without extending into the flange cavity 114 .

[0089] For example, the extension portion 1221 of the cover flange 122 may be bonded to the first side surface 1131 of the shell flange 113, the rolled portion 1222 of the cover flange 122 may be bonded to the shell body 111, or the rolled portion 1222 may be bonded to the shell flange 113. Alternatively, all adjacent surfaces between the cover flange 122 and the shell flange 113 may be bonded, and the cover flange 122 may also be bonded to the shell body 111. The present embodiment does not limit the specific area where the cover flange 122 and the shell flange 113 are bonded.

[0090] In the above embodiment, the cover flange 122 and the shell flange 113 are bonded together, which not only fixes the end cover 12 to the shell 11, but also seals the gap between the shell 11 and the cover, thereby improving the connection strength and sealing between the shell 11 and the end cover 12.

[0091] In addition, the present invention also provides a battery cell. Figure 7 , Figure 7 Schematic diagram of the decomposition structure of the battery cell provided in this application Figure 2 The battery cell comprises an electrode assembly 2, an electrode terminal 3, and a battery housing 1 according to any of the above-described embodiments. The electrode assembly 2 is mounted within a housing formed by the engagement of a housing 11 and an end cap 12. The battery housing 1 has a first through-hole 14. The electrode terminal 3 is connected to the electrode assembly 2 and extends through the first through-hole 14 to the outside of the housing.

[0092] In the embodiments of the present application, the battery cells may be secondary batteries. A secondary battery refers to a battery cell that can be recharged to activate the active material after discharge and continue to be used. For example, the battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present application are not limited thereto.

[0093] In the embodiment of this application, Figure 6 and Figure 7 As shown, the battery housing 1 is provided with a first through hole 14. For example, at least two first through holes 14 can be provided on the end cover 12 to facilitate extending the electrode terminal 3 electrically connected to the electrode assembly 2 from the first through hole 14 on the end cover 12 to the outside of the battery housing 1. The end cover 12 can be snapped together with the shell 11, and the shell flange 113 and the cover flange 122 can be sealed to enclose and form a closed accommodating cavity.

[0094] In the embodiment of this application, Figure 7 As shown, the electrode assembly 2 includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting while allowing active ions to pass through. For example, the electrode assembly 2 can be placed in the accommodating cavity of the battery housing 1.

[0095] For example, the electrode assembly 2 may have a wound structure, a laminated structure, or a hybrid structure of a wound and laminated structure. For example, the positive electrode sheet and the negative electrode sheet may be wound into a wound structure. Alternatively, multiple positive electrode sheets and multiple negative electrode sheets may be provided, and multiple positive electrode sheets and multiple negative electrode sheets may be alternately stacked to form a laminated structure.

[0096] In another example, the electrode assembly 2 is provided with tabs 21, which can conduct current from the electrode assembly 2. The tabs 21 include positive tabs and negative tabs. For example, the positive tabs extend from corresponding positions on each layer of the positive electrode sheet, and the negative tabs extend from corresponding positions on each layer of the negative electrode sheet.

[0097] In the embodiment of this application, Figure 5 As shown, the battery housing 1 is provided with at least one electrode terminal 3. For example, the electrode terminal 3 includes a post. The shape of the post matches the first through-hole 14 on the end cap 12. One end of the post can be electrically connected to the tab 21, and the other end of the post extends through the first through-hole 14 to the side of the end cap 12 away from the housing 11. That is, a portion of the post is located outside the accommodating cavity, facilitating connection of the post to other circuit components. The post can be directly connected to the tab 21 or indirectly connected to the tab 21 via a current collecting member.

[0098] The battery cell provided in the embodiment of the present application includes the battery housing 1 provided in the above embodiment. Therefore, the battery housing 1 in the battery cell can have a higher connection strength and the surface quality of the battery housing 1 can be improved, which is conducive to reducing the hidden dangers caused by defects in the battery housing 1 to the safety performance of the battery cell.

[0099] In some possible embodiments of the present application, Figure 6 and Figure 7 As shown, along the length direction Z of the battery cell, a first through hole 14 is provided on the side wall of the shell 11 , and the electrode tab 21 of the electrode assembly 2 corresponds to the position of the first through hole 14 .

[0100] In the embodiment of this application, Figure 6 and Figure 7 As shown, the battery cell can be configured as a flat, approximately rectangular parallelepiped structure, that is, the length of the battery cell is greater than the width of the battery cell, and the width of the battery cell is greater than the thickness of the battery cell. Furthermore, the shell opening 112 on the housing 11 can be disposed on a surface of the housing 11 that is perpendicular or nearly perpendicular to the thickness direction Y of the battery cell. This allows the depth of the accommodating groove 116 on the housing 11 (along the thickness direction Y of the battery cell) to be smaller than the width of the accommodating groove 116, and the width of the accommodating groove 116 to be smaller than the length of the accommodating groove 116 (along the length direction Z of the battery cell).

[0101] Exemplarily, the first through hole 14 on the battery housing 1 can be set on the shell 11, and the first through hole 14 can be set on the surface of the shell 11 that is perpendicular or nearly perpendicular to the longitudinal direction Z of the battery cell, that is, the first through hole 14 is located on the longitudinal direction Z of the battery cell on the shell 11. Correspondingly, a tab 21 can be set on the axial end face of the electrode assembly 2, and the position of the tab 21 corresponds to the position of the first through hole 14. For example, in the case where there are two tabs 21 (a positive tab 21 and a negative tab 21) on one axial end face of the electrode assembly 2, two first through holes 14 corresponding to the two tabs 21 can be set on the shell 11. Then, an electrode terminal 3 can be set for each tab 21, one end of the electrode terminal 3 is electrically connected to the tab 21, and the other end of the electrode terminal 3 extends to the outside of the shell 11 through the first through hole 14.

[0102] Another example, such as Figure 7 As shown, at least two electrode assemblies 2 can be provided in a battery cell, and the two electrode assemblies 2 can be arranged in the accommodating cavity along the length direction Z of the battery cell, and the two electrode assemblies 2 can be connected in series. For example, two tabs 21 can be provided at both ends of the first sub-electrode assembly 22, and two tabs 21 can be provided at one end of the second sub-electrode assembly 23. The two tabs 21 of the second sub-electrode assembly 23 are electrically connected to the two tabs 21 at one end of the first sub-electrode assembly 22, and the two tabs 21 at the other end of the first sub-electrode assembly 22 are extended to the outside of the battery housing 1 through the electrode terminals 3.

[0103] In the above embodiment, since the first through hole 14 is provided on the side wall of the housing 11, the first through hole 14 can be conveniently processed using the side wall of the housing 11. Furthermore, along the length direction Z of the battery cell, the tab 21 can be provided with a flat structure, which helps to reduce the volume occupied by the tab 21 in the length direction Z of the battery cell, thereby facilitating an increase in the energy density of the battery cell.

[0104] In some possible embodiments of the present application, Figure 7 As shown, the battery cell further includes a bracket 4 , which matches the pole tab 21 of the electrode assembly 2 . The pole tab 21 abuts against the bracket 4 , and the bracket 4 provides support for the pole tab 21 .

[0105] In the embodiment of the present application, a bracket 4 matching the tab 21 can be provided in the battery cell to limit the electrode assembly 2 through the bracket 4 and provide support and limit the tab 21. The bracket 4 can be made of insulating material, such as plastic, rubber, etc.

[0106] For example, Figure 7As shown, when a battery cell includes at least two electrode assemblies 2, a bracket 4 can be provided between the two electrode assemblies 2. For example, a notch matching the electrode tab 21 is provided on the bracket 4, so that the electrode tabs 21 of two adjacent electrode assemblies 2 can pass through the notch on the bracket 4 to be electrically connected. The bracket 4 can also provide support for the electrically connected electrode tabs 21 and limit the position of the two adjacent electrode assemblies 2, so that a stable gap and relative position are maintained between the two adjacent electrode assemblies 2.

[0107] In the above embodiment, since a bracket 4 matching the pole tab 21 is provided in the battery cell, the bracket 4 is set at a position corresponding to the pole tab 21 in the battery housing 1. The bracket 4 can not only limit and fix the electrode assembly 2, but also provide support for the pole tab 21, which is beneficial to reduce the deformation of the pole tab 21 caused by external force.

[0108] In some possible embodiments of the present application, Figure 6 and Figure 7 As shown, the battery cell further includes a fixing member 5 having a second through hole matching the electrode terminal 3 . The fixing member 5 is located outside the battery housing 1 , and the electrode terminal 3 passes through the second through hole to be connected to the fixing member 5 .

[0109] In the embodiment of the present application, after the electrode terminal 3 is extended to the outside of the battery housing 1 through the first through hole 14 on the battery housing 1, the electrode terminal 3 can be fixed. For example, the electrode terminal 3 can be fixedly connected to the end cover 12, or the electrode terminal 3 can be fixedly connected to the housing 11.

[0110] For example, Figure 7 As shown, two electrode terminals 3 can be provided for each tab 21. Correspondingly, a fixing member 5 can be provided for the two electrode terminals 3. For example, a second through hole matching the electrode terminal 3 is provided on the fixing member 5. In this way, the fixing member 5 is located on the side of the end cover 12 away from the shell 11, and the end of the electrode terminal 3 away from the tab 21 can be passed through the second through hole, such as the electrode terminal 3 and the second through hole have an interference fit. The electrode terminal 3 and the fixing member 5 can also be welded to make the connection between the electrode terminal 3 and the fixing member 5 more reliable. Figure 7 As shown, an electrode terminal 3 can also be provided for each tab 21. Correspondingly, a fixing member 5 can be provided for each electrode terminal 3, and a second through-hole can be provided on each fixing member 5. In this way, the fixing member 5 is located outside the housing 11 along the length direction Z of the battery cell, and the end of the electrode terminal 3 away from the tab 21 can be passed through the second through-hole, such as by an interference fit between the electrode terminal 3 and the second through-hole. The electrode terminal 3 and the fixing member 5 can also be welded to ensure a more reliable connection between the electrode terminal 3 and the fixing member 5.

[0111] Another example, such as Figure 6 As shown, a first insulating member 61 can be provided between the fixing member 5 and the housing 11 to isolate the current between the fixing member 5 and the housing 11 and other parts. For example, the structure of the first insulating member 61 can be configured according to the structural shape of the fixing member 5. If the fixing member 5 is a long sheet-like structure, the first insulating member 61 can also be configured as a sheet-like structure with an overall shape similar to that of the long strip. The size of the first insulating member 61 can also be matched to the size of the fixing member 5, such as by making the outline of the first insulating member 61 slightly larger than the outline of the fixing member 5. The first insulating member 61 can be made of a plastic material with good insulating properties, such as polyolefin, polyurethane, and polypropylene. In this way, the first insulating member 61 can be provided between the fixing member 5 and the side wall of the housing 11, so that the fixing member 5 and the housing 11 abut against each other through the first insulating member 61, thereby isolating the current between the fixing member 5 and the housing 11.

[0112] In the above embodiment, since the electrode terminal 3 is provided with a fixing member 5 and the fixing member 5 is located outside the outer shell 1, the end of the electrode terminal 3 away from the pole ear 21 can be fixedly connected to the fixing member 5 to achieve a fixed connection between the electrode terminal 3 and the outer shell 1, so that the electrode terminal 3 can be fixed and limited.

[0113] In some possible embodiments of the present application, the battery cell further includes a pressure relief mechanism 8 , which is disposed on the housing 11 and is used to discharge substances in the accommodating cavity.

[0114] In the embodiment of this application, Figure 7 As shown, a pressure relief mechanism 8 can be provided on the battery cell, for example, the pressure relief mechanism 8 is provided on the side wall of the housing 11 , such as the pressure relief mechanism 8 is provided on the side wall of the housing 11 extending along the length direction Z of the battery cell.

[0115] For example, when the internal pressure or temperature of the battery cell's accommodating cavity reaches a predetermined threshold, the pressure relief mechanism 8 is activated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism 8 is activated or the weak structure provided in the pressure relief mechanism 8 is destroyed, thereby forming an opening or channel for the internal pressure or temperature of the battery cell to be released. The design of this threshold varies depending on the design requirements. This threshold may depend on the material of one or more of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell.

[0116] In another example, the pressure relief mechanism 8 can be integrally formed with the housing 11, or the pressure relief mechanism 8 can be separately provided and connected to the housing 11. For example, the pressure relief mechanism 8 can be an explosion-proof valve.

[0117] As another example, a support member 81 may be provided for the pressure relief mechanism 8 to limit the electrode assembly 2 through the support member 81 so that there is a gap between the electrode assembly 2 and the pressure relief mechanism 8. The pressure relief mechanism 8 may also be supported and fixed by the support member 81. For example, the support member 81 may be provided as a plate-like structure that matches the length and width of the side wall extending along the length direction Z of the battery cell on the shell 11, such as the length of the support member 81 is equal to or less than the length of the upper side wall of the shell 11, and the wide side of the support member 81 is equal to or less than the width of the upper side wall of the shell 11. A through hole matching the pressure relief mechanism 8 may be provided on the plate-like support member 81 so that at least a portion of the pressure relief mechanism 8 is located in the through hole on the support member 81, so that the pressure relief mechanism 8 is supported by the support member 81. After the support member 81 is fixed to the side wall of the shell 11 by bonding or other means, the electrode assembly 2 can be made to abut against the support member 81. By setting the thickness of the support member 81, a gap can be created between the electrode assembly 2 and the pressure relief mechanism 8, thereby facilitating the pressure inside the battery cell (the gas generated inside the battery cell increases the internal pressure of the battery cell) to reach the position of the pressure relief mechanism 8.

[0118] It should be noted that the "activation" mentioned in the embodiments of the present application refers to the action of the pressure relief mechanism 8 or its activation to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action produced by the pressure relief mechanism 8 may include but is not limited to: the movement of components in the pressure relief mechanism 8 to form an exhaust channel, at least a part of the pressure relief mechanism 8 rupturing, breaking, being torn or opening, etc. When the pressure relief mechanism 8 is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as emissions. In this way, the pressure and temperature of the battery cell can be relieved under controllable pressure or temperature, thereby reducing the potential for more serious accidents.

[0119] In the embodiment of the present application, when the housing is a non-sealed structure, the pressure relief mechanism 8 can be configured as a through hole to discharge the gas inside the battery cell. The emissions from the battery cell mentioned in the embodiment of the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, separator fragments, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0120] In the above embodiment, since a pressure relief mechanism 8 is provided on the shell 11 of the battery housing 1, when the pressure and temperature inside the battery cell reach a preset threshold value, an opening or channel for releasing the pressure or temperature inside the battery cell can be formed by the pressure relief mechanism 8, thereby enabling the battery cell to release pressure and temperature under controllable pressure or temperature, thereby reducing the occurrence of potentially more serious accidents.

[0121] In some possible embodiments of the present application, the battery cell further includes a third insulating member 9 , which is coated on the electrode assembly 2 and is used to isolate the current between the electrode assembly 2 and the battery housing 1 .

[0122] In the embodiment of the present application, a third insulating member 9 can be provided on the electrode assembly 2. For example, the third insulating member 9 can be made of Mylar film, that is, the third insulating member 9 is made of polyester film, which has good insulation properties, high temperature resistance and corrosion resistance. The third insulating member 9 can be wrapped around the electrode assembly 2 in the length direction Z of the battery cell, and the third insulating member 9 can be wrapped around the electrode assembly 2 at least once, so that the third insulating member 9 is tightly wrapped around the electrode assembly 2. In this way, in the process of placing the electrode assembly 2 into the accommodating groove 116 on the shell 11, the third insulating member 9 can reduce the scratching between the electrode assembly 2 and the shell 11, thereby reducing the occurrence of the electrode assembly 2 being scratched by the shell 11.

[0123] In the above embodiment, since the third insulating member 9 is coated on the electrode assembly 2, the third insulating member 9 can reduce the possibility of scratching the electrode assembly 2 during the assembly of the battery cell. The third insulating member 9 can also isolate the electrode assembly 2 from the battery housing 1, thereby providing good insulation protection for the electrode assembly 2.

[0124] The present application also provides a battery device, referring to Figure 8 , Figure 8 This is a schematic diagram of the exploded structure of the battery device provided in this application. The battery device 100 includes: a box body 102 and a battery cell 101 provided in the above embodiment. The box body 102 has an installation cavity; the battery cell 101 is disposed in the installation cavity.

[0125] In the embodiment of the present application, one battery cell 101 may be disposed in the housing 102, or at least two battery cells 101 may be disposed in the housing 102. A battery cell assembly 101 may be formed by multiple battery cells 101. For example, multiple battery cells 101 may be connected in series, in parallel, or in series via a busbar to form a battery cell assembly.

[0126] In the embodiments of the present application, the battery device 100 may be a battery pack or an energy storage device. The battery pack includes a housing 102 and one or more battery cell 101 assemblies, with the battery cell 101 assembly housed in the housing 102. For example, the battery cell 101 assembly may be a battery module, which may be housed in the housing 102 by securing the battery module to the housing 102. Alternatively, the battery cell 101 assembly may be housed in the housing 102 by directly securing multiple battery cells 101 to the housing 102.

[0127] In the embodiment of the present application, a mounting cavity for accommodating the battery cell 101 can be formed on the housing 102, or a cover 103 can be provided on the housing 102. The cover 103 and the housing 102 are combined to form a closed mounting cavity for accommodating the battery cell 101. The term "closed" here means covering or closing, and can be either sealed or unsealed.

[0128] Exemplarily, the box 102 can be used as a part of the chassis structure of the vehicle. For example, part of the box 102 can become at least a part of the floor of the vehicle, or part of the box 102 can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0129] The battery device 100 provided in the embodiment of the present application includes the battery cell 101 provided in the above-mentioned embodiment. Therefore, the battery housing 1 in the battery cell 101 can have a higher connection strength and the surface quality of the battery housing 1 can be improved, which is conducive to reducing the hidden dangers of defects in the battery housing 1 to the safety performance of the battery cell 101, thereby improving the safety performance of the battery cell 101 and further improving the safety performance of the battery device 100.

[0130] The present application also provides an electrical device, referring to Figure 9 , Figure 9 This is a schematic diagram of the structure of the electric device provided in this application. The electric device includes a battery cell 101 or a battery device 100 provided in the above embodiment for providing electric energy.

[0131] In the embodiment of the present application, the battery cell 101 and / or the battery device 100 is installed in an electrical device or electrically connected to the electrical device, and the battery cell 101 and / or the battery device 100 can provide power to the electrical device.

[0132] In the embodiment of the present application, the electrical device can be a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship, a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft.

[0133] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as an example of a vehicle.

[0134] like Figure 9 As shown, the vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The vehicle is provided with an electrical device inside, which can be located at the bottom, head, or tail of the vehicle. The electrical device can be used to power the vehicle, for example, the electrical device can serve as the operating power source of the vehicle. The vehicle can also include a controller 200 and a motor 300. The controller 200 is used to control the electrical device to power the motor 300, for example, to meet the power requirements for starting the vehicle, navigation, and driving.

[0135] In the embodiment of the present application, the electrical device can not only serve as the operating power source of the vehicle, but also serve as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0136] The electrical device provided in the embodiment of the present application includes the battery cell 101 or the electrical device provided in the above embodiment. Therefore, the battery casing 1 in the battery cell 101 can have a higher connection strength and the surface quality of the battery casing 1 can be improved, which is conducive to reducing the hidden dangers caused by defects in the battery casing 1 to the safety performance of the battery cell 101, thereby improving the safety performance of the battery cell 101, and further improving the safety performance of the electrical device.

[0137] The above embodiments are intended only to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. Such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments of the present application, and they should all be included within the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments may be combined in any manner.

Claims

1. A battery casing, characterized in that: include: A shell body, wherein the shell body has a shell opening, an edge of the shell opening on the shell body forms a shell flange, and a flange cavity is defined between the shell flange and the shell body; An end cover, wherein the edge of the cover body of the end cover forms a cover flange, the end cover and the shell are buckled together, the extension portion of the cover flange is connected to the first side surface of the shell flange away from the shell body, and the winding portion of the cover flange extends through the shell flange to the flange cavity; the extension portion is the portion of the cover flange close to the cover body, and the winding portion is the portion of the cover flange connected to the extension portion and away from the cover body.

2. The battery housing according to claim 1, wherein: At least a portion of the cover flange and the shell flange are adjacent to each other and are welded.

3. The battery case according to claim 1 or 2, characterized in that: The first side surface is welded to the cover flange.

4. The battery housing according to claim 3, wherein: An orthographic projection of a welding area between the first side surface and the cover flange on the first side surface is located within the first side surface.

5. The battery case according to claim 1 or 2, characterized in that: The extension portion is connected to the cover body via a cover bending portion, the shell flange is connected to the shell body via a shell bending portion, and the cover bending portion abuts against the shell bending portion.

6. The battery case according to claim 1 or 2, characterized in that: The winding portion is bonded to the shell body.

7. The battery case according to claim 1 or 2, characterized in that: The cover flange is bonded to the shell flange.

8. A battery cell, characterized in that: include: The battery housing according to any one of claims 1 to 7, wherein the battery housing has a first through hole; an electrode assembly, the electrode assembly being located in a receiving cavity formed by the engagement of the housing and the end cover; An electrode terminal is connected to the electrode assembly and extends through the first through hole to outside the accommodating cavity.

9. The battery cell according to claim 8, characterized in that The first through hole is provided on the side wall of the shell along the length direction of the battery cell, and the electrode tab of the electrode assembly corresponds to the position of the first through hole.

10. The battery cell according to claim 8, characterized in that It also includes a bracket, which matches the electrode tab of the electrode assembly. The electrode tab abuts against the bracket, and the bracket provides support for the electrode tab.

11. The battery cell according to claim 8, characterized in that The battery housing further includes a fixing member having a second through hole matching the electrode terminal. The fixing member is located outside the battery housing, and the electrode terminal passes through the second through hole and is connected to the fixing member.

12. The battery cell according to claim 8, characterized in that It also includes a pressure relief mechanism, which is arranged on the shell and is used to discharge the substances in the accommodating cavity.

13. The battery cell according to claim 8, characterized in that It also includes a third insulating member, which is coated on the electrode assembly and is used to isolate the current between the electrode assembly and the battery casing.

14. A battery device, characterized in that: include: A box body having a mounting cavity; The battery cell according to any one of claims 8 to 13, wherein the battery cell is arranged in the mounting cavity.

15. An electrical device, characterized in that: The electrical device comprises the battery cell according to any one of claims 8 to 13 or the battery device according to claim 14 for providing electrical energy.

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