Battery, electric device, and battery manufacturing method

Abstract

The application provides a battery, an electric device and a battery manufacturing method. The battery comprises a shell and a battery pack comprising a plurality of battery cells; the shell comprises a first sub-shell and a second sub-shell arranged along a first direction, the first sub-shell comprises a first part, and the second sub-shell comprises a second part, along a second direction, the second part is closer to the battery pack than the first part; a first surface of the first part and a fourth surface of the second part form a first joint surface, the first sub-shell and the second sub-shell are joined by welding and form a first welding area, viewed along a third direction, the first welding area has a first area farther from the battery pack than the first joint surface in the second direction, and a second area closer to the battery pack than the first joint surface in the second direction, the average length of the first area in the second direction is a first length, the distance between the first surface and the second surface in the second direction is a second length, and the first length is smaller than the second length.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery, an electrical device, and a method for manufacturing a battery. Background Technology

[0002] Batteries are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices and other fields.

[0003] A battery comprises a casing and a cell, with the cell housed within the casing. The casing is formed from multiple separate parts, at least two of which are welded together to provide good structural strength. However, welding can result in significant protruding areas at the welded joints of the casing. When these welded areas are on the outer surface of the casing, it can lead to problems such as difficulty in assembling the battery with other structures, interference between the protruding areas and components like wiring, and damage to other structures. Summary of the Invention

[0004] This application provides a battery, an electrical device, and a battery manufacturing method to improve the appearance quality of the battery casing.

[0005] In a first aspect, embodiments of this application provide a battery, the battery including a casing and a battery pack including a plurality of cells; the battery pack is housed within the casing; wherein, the casing includes a first sub-casing and a second sub-casing arranged along a first direction, the first sub-casing including a first portion, the second sub-casing including a second portion, the first portion including a first surface and a second surface arranged along a second direction, the first surface being closer to the battery pack than the second surface along the second direction, the second portion including a third surface and a fourth surface arranged along the second direction, the third surface being closer to the battery pack than the fourth surface along the second direction, and the second portion being closer to the battery pack than the first portion; the first surface and the fourth surface form a first joint surface, the first sub-casing and the second sub-casing are joined by welding to form a first welding region, viewed along a third direction, the first welding region has a first region further away from the battery pack than the first joint surface in the second direction, and a second region closer to the battery pack than the first joint surface in the second direction, the average length of the first region in the second direction is a first length, the distance between the first surface and the second surface in the second direction is a second length, the first length is less than the second length, and the first direction, the second direction and the third direction are perpendicular to each other.

[0006] In the above technical solution, the first sub-shell and the second sub-shell are joined by welding to form a first welding area. The first welding area includes a first region and a second region. The first region is further away from the battery pack relative to the first joint surface in a second direction, while the second region is closer to the battery pack relative to the first joint surface in the second direction. Since the second region is closer to the battery pack relative to the first region in the second direction, and the average length of the first region is less than the distance between the first and second surfaces in the second direction, the degree to which the first region protrudes from the second surface in the second direction will be very small. In some embodiments, the second region may not protrude from the second surface in the second direction, which facilitates the assembly of the battery with other structures, reduces the risk of interference between the first welding area and other structures, and reduces the risk of damage to other structures due to the first welding area protruding from the second surface. Furthermore, the fact that the first region protrudes from the second surface in the second direction is very small or that the second region does not protrude from the second surface in the second direction makes the appearance of the shell at the welding position smoother, thereby improving the appearance quality of the shell.

[0007] In some embodiments of the first aspect of this application, the distance between the third surface and the fourth surface along the second direction is a third length, and the second length is less than the third length.

[0008] In the above technical solution, the second length is shorter than the third length, which facilitates welding through the first part and then welding it to the second part during the welding process, reducing the welding difficulty between the first and second parts. The third length is longer than the second length, which helps reduce the risk of high-temperature damage to the internal structure of the shell during welding, and also makes the overall size of the first and second parts along the second direction larger, which helps to give the shell better structural strength at the point where the first and second parts mate.

[0009] The second length being less than the third length helps reduce the risk of the second part being welded through during the welding process, so that the structural strength of the second part can meet the usage requirements while improving the welding quality.

[0010] In some embodiments of the first aspect of this application, the ratio of the second length to the third length is less than or equal to 1 / 2.

[0011] In the above technical solution, the ratio of the second length to the third length is less than or equal to 1 / 2, which further facilitates welding through the first part and then welding it to the second part during the welding process, reducing the welding difficulty between the first and second parts. The ratio of the second length to the third length being less than or equal to 1 / 2, meaning the ratio of the third length to the first part is greater than or equal to the second length, makes it more difficult for the second part to be welded through during the welding process. This improves welding quality while ensuring that the structural strength of the second part meets the usage requirements.

[0012] In some embodiments of the first aspect of this application, the average length of the second region in the second direction is a fourth length, which is greater than or less than the first length.

[0013] In the above technical solution, if the fourth length is greater than the first length, the welding depth of the second part is greater, which is beneficial to improving the welding strength between the first and second parts, thereby improving the connection stability between the first and second sub-shells. If the fourth length is less than the first length, the risk of the second part being welded through during the welding process is lower.

[0014] In some embodiments of the first aspect of this application, the distance between the third surface and the fourth surface along the second direction is the third length, the average length of the second region in the second direction is the fourth length, and the ratio of the fourth length to the third length is less than or equal to 2 / 3.

[0015] In the above technical solution, the ratio of the fourth length to the third length is less than or equal to 2 / 3, which helps to reduce the risk of welding through the second part and reduces the deformation of the second part during the welding process. Thus, while improving the welding quality, the structural strength of the second part meets the usage requirements.

[0016] In some embodiments of the first aspect of this application, the first welding region extends along a third direction.

[0017] In the above technical solution, the first welding area is along the third direction, which increases the connection area between the first sub-shell and the second sub-shell along the third direction, thereby improving the connection stability between the first sub-shell and the second sub-shell.

[0018] In some embodiments of the first aspect of this application, when viewed along a first direction, the first portion and the second sub-shell overlap.

[0019] In the above technical solution, when viewed along the first direction, the first part and the second sub-shell overlap, so the first part and the second sub-shell share a portion of space, which can reduce the size of the overall structure formed by the first part and the second sub-shell, which is beneficial to reducing the overall size of the shell, thereby helping to reduce the size of the battery and to miniaturize the battery structure.

[0020] In some embodiments of the first aspect of this application, along a first direction, the first sub-shell includes a fifth surface facing a second portion, the first portion protruding from the fifth surface, the second portion including a sixth surface facing the fifth surface, a first gap existing between the fifth and sixth surfaces, the first gap being filled with a colloid.

[0021] In the above technical solution, along the first direction, a first gap exists between the fifth surface of the first sub-shell and the sixth surface of the second part, providing deformation space for the deformation of the first and second parts during the welding process. The first gap is filled with colloid, allowing the first sub-shell and the second part to connect through the colloid within the first gap, increasing the connection area between the first and second sub-shells, thereby improving the connection stability of the first and second sub-shells. The colloid filling the first gap also helps improve the airtightness between the first and second sub-shells.

[0022] In some embodiments of the first aspect of this application, the first sub-shell further includes a third portion protruding from the fifth surface along a first direction, the third portion and the first portion being arranged at a distance from each other along a second direction, and the second portion being inserted between the first portion and the third portion.

[0023] In the above technical solution, the second part is inserted between the first part and the third part. The first part and the third part can respectively limit the second part on both sides along the second direction, reduce the deformation of the second part during the welding process, thereby improving the welding quality of the first part and the second part, and further improving the connection stability of the first sub-shell and the second sub-shell.

[0024] In some embodiments of the first aspect of this application, a first receiving groove is formed on a third surface along a second direction, and the first receiving groove extends to a sixth surface along a first direction, with at least a portion of the third portion being received within the first receiving groove.

[0025] In the above technical solution, the third surface of the second part is formed with a first receiving groove, and at least part of the third part is received in the first receiving groove. This makes the third part and the second part more compact, which is beneficial to reducing the overall structural size of the first sub-shell and the second sub-shell, thereby helping to reduce the structural size of the battery and miniaturize the battery structure.

[0026] In some embodiments of the first aspect of this application, along a second direction, the first receiving groove has a first wall facing a third portion, the third portion including a seventh surface disposed facing the first wall, a second gap existing between the first wall and the seventh surface, the second gap being filled with colloid.

[0027] In the above technical solution, along the second direction, a second gap exists between the first wall of the first receiving groove and the seventh surface of the third part, facilitating the insertion of the second part between the first and third parts. During welding of the second part to the first part, the second gap also provides deformation space for the second part. The second gap is filled with colloid, allowing the third part and the second part to connect through the colloid within the second gap, increasing the connection area between the first and second sub-shells, thereby improving the connection stability of the first and second sub-shells. The colloid filling the second gap also helps improve the airtightness between the first and second sub-shells.

[0028] In some embodiments of the first aspect of this application, along a first direction, the third portion includes an eighth surface, the first receiving groove includes a second wall disposed facing the eighth surface, a third gap exists between the eighth surface and the second wall, and the third gap is filled with colloid.

[0029] In the above technical solution, along the first direction, a third gap exists between the eighth surface of the third part and the second wall of the first receiving groove. When the second part is welded to the first part, this second gap provides deformation space for the second part. The third gap is filled with colloid, allowing the third part and the second part to connect through the colloid within the third gap. This increases the connection area between the first sub-shell and the second sub-shell, thereby improving the connection stability between the first sub-shell and the second sub-shell. The colloid filling the third gap also helps improve the airtightness between the first sub-shell and the second sub-shell.

[0030] In some embodiments of the first aspect of this application, along the first direction, the dimension of the third portion is L1, and the distance between the fifth surface and the second wall is L2, where L1 < L2.

[0031] In the above technical solution, if L1 < L2, then along the first direction, a gap can be formed between the end of the third part furthest from the fifth surface and the second wall. This gap provides deformation space for the second part when it is welded to the first part. This gap can also be used to fill colloid, so that the third part and the second part are connected by colloid filled in the gap, which can increase the connection area between the first sub-shell and the second sub-shell, thereby improving the connection stability of the first sub-shell and the second sub-shell.

[0032] In some embodiments of the first aspect of this application, 2mm≤L1≤4mm; and / or, along the second direction, the size of the third portion is L3, 1.5mm≤L3≤3mm.

[0033] In the above technical solution, if L1 < 2mm, the dimension of the third part along the first direction is too small to meet the limiting requirement of the second part. If L1 > 4mm, the dimension of the third part along the first direction is too large, which may make it difficult to insert the second part between the first and fourth parts, thus increasing the assembly difficulty of the first and second sub-shells. Therefore, 2mm ≤ L1 ≤ 4mm allows the third part to limit the second part and facilitates the insertion of the second part between the first and third parts, thus facilitating the assembly of the first and second sub-shells. If L3 < 1.5mm, the dimension of the third part along the second direction is too small, resulting in weak strength. If L3 > 3mm, the dimension of the third part along the second direction is too large, requiring a large space. Therefore, 1.5mm ≤ L3 ≤ 3mm ensures that the third part has good strength, enabling it to better limit the second part, while also minimizing the space occupied by the third part, which helps reduce the overall size of the structure composed of the first and second sub-shells.

[0034] In some embodiments of the first aspect of this application, the first sub-shell further includes a fourth portion, and the second sub-shell further includes a fifth portion. The fourth portion includes a ninth surface and a tenth surface arranged along a second direction, with the ninth surface closer to the battery pack than the tenth surface along the second direction. The fifth portion includes an eleventh surface and a twelfth surface arranged along the second direction, with the eleventh surface closer to the battery pack than the twelfth surface along the second direction. The fourth portion is closer to the battery pack than the fifth portion. The tenth surface and the eleventh surface form a second joint surface. The first sub-shell and the second sub-shell are joined by welding to form a second welded area. Viewed along a third direction, the second welded area has a third area further away from the battery pack than the second joint surface in the second direction, and a fourth area closer to the battery pack than the second joint surface in the second direction. The average length of the third area in the second direction is a fifth length, and the distance between the eleventh surface and the twelfth surface in the second direction is a sixth length. The fifth length is less than the sixth length.

[0035] In the above technical solution, the first sub-shell and the second sub-shell are joined by welding to form a second welding area. The second welding area includes a third area and a fourth area. The third area is further away from the battery pack relative to the first joint surface in the second direction, and the fourth area is closer to the battery pack relative to the first joint surface in the second direction. Since the fourth part is closer to the battery pack relative to the fifth part in the second direction, the average length of the third area in the second direction is less than the distance between the ninth and tenth surfaces. Therefore, the degree to which the third area protrudes from the twelfth surface in the second direction is very small. In some embodiments, the third area does not protrude from the twelfth surface in the second direction, which facilitates the assembly of the battery with other structures, reduces the risk of interference between the second welding area and other structures, and reduces the risk of damage to other structures due to the second welding area protruding from the twelfth surface. In some embodiments, the degree to which the third area protrudes from the twelfth surface in the second direction is very small, or the third area does not protrude from the twelfth surface in the second direction, makes the appearance of the shell at the welding position smoother, thereby improving the appearance quality of the shell.

[0036] In some embodiments of the first aspect of this application, the first sub-shell includes a first base wall, a first side wall, and a second side wall, the first side wall and the second side wall being disposed opposite to each other along a second direction, and the first base wall connecting the first side wall and the second side wall; the second sub-shell includes a second base wall, a third side wall, and a fourth side wall, the third side wall and the fourth side wall being disposed opposite to each other along a second direction, and the second base wall connecting the third side wall and the fourth side wall; the first base wall and the second base wall are disposed opposite to each other along a first direction, the first part being a part of the first side wall, the fourth part being a part of the second side wall, the second part being a part of the third side wall, and the fifth part being a part of the fourth side wall.

[0037] In the above technical solution, the first sub-shell includes a first base wall, a first side wall, and a second side wall, and the second sub-shell includes a second base wall, a third side wall, and a fourth side wall. The first side wall and the second side wall are arranged opposite to each other along a second direction, the third side wall and the fourth side wall are arranged opposite to each other along a second direction, and the first base wall and the second base wall are arranged opposite to each other along a first direction. The first part is a part of the first side wall, the fourth part is a part of the second side wall, the second part is a part of the third side wall, and the fifth part is a part of the fourth side wall, which facilitates the connection between the first sub-shell and the second sub-shell.

[0038] In some embodiments of the first aspect of this application, along a first direction, the length of the first sidewall is greater than the length of the third sidewall, and the length of the second sidewall is less than the length of the fourth sidewall.

[0039] In the above technical solution, the length of the first sidewall is greater than that of the third sidewall, and the second part of the third sidewall is closer to the battery pack than the first part of the first sidewall. Therefore, the third sidewall helps to limit the deformation of the first sidewall (or the first part) towards the battery pack during welding, thereby improving the welding quality of the first and second parts, and consequently improving the connection stability of the first and second sub-shells. Similarly, the length of the second sidewall is less than that of the fourth sidewall, and the fourth part of the second sidewall is closer to the battery pack than the first part of the first sidewall. This also helps to limit the deformation of the fourth sidewall (or the fifth part) towards the battery pack during welding, thereby improving the welding quality of the fourth and fifth parts, and consequently improving the connection stability of the first and second sub-shells.

[0040] In some embodiments of the first aspect of this application, the first sub-shell and the second sub-shell have the same structure.

[0041] In the above technical solution, the first sub-shell and the second sub-shell have the same structure, which makes the assembly of the first sub-shell and the second sub-shell more convenient.

[0042] In some embodiments of the first aspect of this application, the first sub-shell and the second sub-shell together define a cavity having a first opening and a second opening, the first opening and the second opening being disposed opposite to each other in a third direction; the battery also includes a first cover and a second cover, the first cover and the second cover respectively closing the first opening and the second opening.

[0043] In the above technical solution, the first sub-shell and the second sub-shell together define a cavity with a first opening and a second opening, facilitating the installation of the battery pack and other internal structures. The first cover and the second cover respectively close the first opening and the second opening, which helps improve the airtightness of the battery and provides better protection for the internal structure of the battery.

[0044] In some embodiments of the first aspect of this application, the first welding region extends along a third direction, and the two ends of the first welding region along the third direction do not extend beyond the two end faces of the housing.

[0045] In the above technical solution, the two ends of the first welding area along the third direction do not extend beyond the shell, which can reduce the risk of the first welding area interfering with the sealing of the first and second covers and the sealing of the first and second openings, so that the first cover can better seal the first opening and the second cover can better seal the second opening, thereby improving the airtightness of the battery.

[0046] In some embodiments of the first aspect of this application, the first welding area extends along a third direction, and the two ends of the first welding area along the third direction extend beyond the two end faces of the housing; the first cover has a first clearance portion opposite to the first welding area on the side facing the first opening, and the second cover has a second clearance portion opposite to the first welding area on the side facing the second opening, and the first clearance portion and the second clearance portion are used to clear the portion of the first welding area that extends beyond the end face.

[0047] In the above technical solution, the first cover is provided with a first clearance portion facing the first opening to avoid the portion of the first welding area extending beyond the end face, and the second cover is provided with a second clearance portion facing the second opening to avoid the portion of the first welding area extending beyond the end face. This avoids the first welding area interfering with the sealing of the first and second covers by the first and second covers, thereby enabling the first cover to better seal the first opening and the second cover to better seal the second opening, which is beneficial to improving the airtightness of the battery.

[0048] Secondly, embodiments of this application provide an electrical device, including the battery provided in any embodiment of the first aspect.

[0049] Thirdly, embodiments of this application provide a battery manufacturing method, the battery manufacturing method comprising:

[0050] Provide battery packs that include multiple cells;

[0051] A first sub-shell and a second sub-shell are provided, the first sub-shell having a first surface for engaging with the second sub-shell, and the second sub-shell having a fourth surface for engaging with the first sub-shell;

[0052] A receiving space is formed on the first surface and / or the fourth surface;

[0053] The first and fourth surfaces are joined to form a joint surface so that the battery pack is accommodated in the space defined by the first and second sub-casings;

[0054] The first sub-shell and the second sub-shell are welded at the corresponding positions in the accommodating space.

[0055] In the above technical solution, a receiving space is formed on the first surface and / or the fourth surface, and the first sub-shell and the second sub-shell are welded at the corresponding positions of the receiving space. During the welding process, the molten portions of the first and second sub-shells enter the receiving space, resulting in a smaller protrusion of the welded area from the outer surface of the shell. In some embodiments, the welded area may not protrude from the outer surface of the shell, facilitating the assembly of the battery with other structures, reducing the risk of interference between the welded area and other structures, and reducing the risk of damage to other structures due to the welded area protruding from the outer surface of the shell. In some embodiments, the degree to which the welded area protrudes from the surface of the shell is very small or the welded area does not protrude from the outer surface of the shell, making the appearance of the shell at the welding position smoother, thereby improving the appearance quality of the shell. Attached Figure Description

[0056] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 An exploded view of a battery provided in some embodiments of this application;

[0058] Figure 2 A schematic diagram of the battery provided in some embodiments of this application after the second cover has been removed, viewed from the third-party direction in the direction from the second opening to the first opening;

[0059] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0060] Figure 4 for Figure 3 Enlarged view at point A1;

[0061] Figure 5 for Figure 2 A schematic diagram before the welding process is implemented at point A in the middle;

[0062] Figure 6 for Figure 5 Enlarged view at point A2;

[0063] Figure 7 A schematic diagram showing the first receiving portion defined by the first end face and the fourth surface formed by the second part;

[0064] Figure 8 A schematic diagram of the first and second parts before the welding process is performed, as provided in some other embodiments of this application;

[0065] Figure 9 for Figure 8 Enlarged view at point A3;

[0066] Figure 10 A schematic diagram of the first and second parts before the welding process is performed, provided for some embodiments of this application;

[0067] Figure 11 for Figure 10 Enlarged view at A4 in the middle;

[0068] Figure 12 A schematic diagram of the first and second parts before the welding process is performed, as provided in some embodiments of this application;

[0069] Figure 13 A partial view of a second portion of a third surface having a first receiving groove, provided for some embodiments of this application;

[0070] Figure 14 A schematic diagram showing the welding of a first portion and a second portion to form a first weld area, provided for further embodiments of this application;

[0071] Figure 15 A schematic diagram showing the welding of a first portion and a second portion to form a first weld area, provided for further embodiments of this application;

[0072] Figure 16 for Figure 2 Enlarged view of point B in the middle;

[0073] Figure 17 for Figure 16 Enlarged view at point B1;

[0074] Figure 18 A schematic diagram of the fourth and fifth parts before the welding process is performed, as provided in some embodiments;

[0075] Figure 19 for Figure 18 Sectional view at point B2;

[0076] Figure 20 A schematic diagram of the fourth and fifth parts before the welding process is performed, provided for some embodiments of this application;

[0077] Figure 21 for Figure 20 Enlarged view at B3;

[0078] Figure 22 A schematic diagram of the fourth and fifth parts before the welding process is performed, as provided in some embodiments of this application;

[0079] Figure 23 for Figure 22 Enlarged view at B4 in the middle;

[0080] Figure 24 A partial schematic diagram showing that the ninth surface of the fourth part of some embodiments of this application has a second receiving groove formed thereon;

[0081] Figure 25 Exploded views of the housing provided for some embodiments of this application;

[0082] Figure 26 An exploded view of a battery provided for other embodiments of this application;

[0083] Figure 27 for Figure 26 Enlarged view of point C in the middle.

[0084] Icons: 100 - Battery; 10 - Housing; 11 - First Sub-Housing; 111 - First Part; 1111 - First Surface; 1112 - Second Surface; 1113 - Second End Face; 112 - Fifth Surface; 113 - Third Part; 1131 - Seventh Surface; 1132 - Eighth Surface; 1133 - Third Chamfered Surface; 114 - Fourth Part; 1141 - Ninth Surface; 1142 - Tenth Surface; 11421 - Third Recess; 1143 - Fourteenth Surface; 1144 - Fourth Chamfered Surface; 1145 - Second Receiving Groove; 11451 - Third Wall; 11452 - Fourth Wall; 1146 - Fifth chamfered surface; 115 - Third end face; 116 - Second side face; 117 - First side wall; 1171 - First main body; 118 - Second side wall; 1181 - Second main body; 119 - First base wall; 12 - Second sub-shell; 121 - Second part; 1211 - Third surface; 1212 - Fourth surface; 1213 - Sixth surface; 1214 - First chamfered surface; 1215 - First receiving groove; 1215a - First wall; 1215b - Second wall; 1216 - Second chamfered surface; 122 - First end face; 123 - First side face; 124 - Fifth part; 1241 - Eleventh surface; 12411 - Fourth recess; 1242 - Twelfth surface; 1243 - Fourth end face; 125 - Thirteenth surface; 126 - Sixth part; 1261 - Fifteenth surface; 1262 - Sixteenth surface; 1263 - Sixth chamfered surface; 127 - Third sidewall; 1271 - Third body; 128 - Fourth sidewall; 1281 - Fourth body; 129 - Second base wall; 13 - First mating surface; 14 - First welding area; 141 - First area; 142 - Second area; 143 - First extension surface; 15 - Accommodation space; 151 - First recess 152 - Second recessed portion; 16 - Second mating surface; 17 - Second welding area; 171 - Third area; 172 - Fourth area; 173 - Second extension surface; 18 - First opening; 19 - Second opening; 20 - Battery pack; 21 - Cell; 30 - First cover; 31 - First clearance portion; 40 - Second cover; X - First direction; Y - Second direction; Z - Third direction; C1 - First receiving portion; C3 - Third receiving portion; D1 - First spacing; D2 - Second spacing; D3 - Third spacing; D4 - Fourth spacing; D5 - Fifth spacing; D6 - Sixth spacing; E - colloid. Detailed Implementation

[0085] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0086] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0087] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0088] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0089] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0090] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage devices, and many other fields. As the application areas of batteries continue to expand, the market demand for them is also constantly increasing.

[0091] The development of batteries requires consideration of many factors, such as energy density, cycle life, discharge capacity, charge / discharge rate, reliability and other performance parameters. In addition, the appearance quality of the battery also needs to be considered.

[0092] A battery consists of a casing and a battery pack, with the battery pack housed within the casing. The battery casing is generally composed of multiple parts, which are connected by welding to form a unified structure. When the weld is on the outer surface of the casing, the casing will bulge significantly outward relative to the other outer surfaces at the weld location. This can potentially cause problems during subsequent battery use, such as difficulties in assembling the battery with other structures, interference between the protruding area and components like wiring, and damage to other structures. Furthermore, the significant outward protrusion of the weld location relative to the other outer surfaces of the casing also affects the casing's appearance, reducing its aesthetic quality.

[0093] Based on the above considerations, in order to improve the appearance quality of the battery casing, this application provides a battery casing including a first sub-casing and a second sub-casing. The first sub-casing includes a first portion, and the second sub-casing includes a second portion. The first portion includes a first surface and a second surface arranged along a second direction. Along the second direction, the first surface is closer to the battery pack than the second surface. The second portion includes a third surface and a fourth surface arranged along the second direction. Along the second direction, the third surface is closer to the battery pack than the fourth surface, and the second portion is closer to the battery pack than the first portion. The first surface and the fourth surface form a first joint surface. The first sub-casing and the second sub-casing are joined by welding to form a first welding area. Viewed along a third direction, the first welding area has a first region that is farther away from the battery pack than the first joint surface in the second direction, and a second region that is closer to the battery pack than the first joint surface in the second direction. The average length of the first region in the second direction is a first length, and the distance between the first surface and the second surface in the second direction is a second length. The first length is less than the second length, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0094] The first sub-shell and the second sub-shell are joined by welding to form a first welding region. The first welding region includes a first region and a second region. The first region is further away from the battery pack relative to the first joint surface in a second direction, and the second region is closer to the battery pack relative to the first joint surface in a second direction. Since the second region is closer to the battery pack relative to the first region in the second direction, the average length of the first region along the second direction is less than the distance between the first surface and the second surface. Therefore, the degree to which the first region protrudes from the second surface along the second direction will be very small. In some embodiments, the first region may not protrude from the second surface along the second direction, which facilitates the assembly of the battery with other structures, reduces the risk of interference between the first welding region and other structures, and reduces the risk of damage to other structures due to the first welding region protruding from the second surface.

[0095] In some embodiments, the first region protrudes very little from the second surface along the second direction or the second region does not protrude from the second surface along the second direction, making the appearance of the housing at the welding position smoother, thereby improving the appearance quality of the housing.

[0096] The batteries disclosed in this application can be used, but are not limited to, in electrical devices such as electric two-wheelers, power tools, drones, and energy storage devices. Batteries meeting the operating conditions described in this application can also be used as the power system for electrical devices, which improves the battery's appearance quality and facilitates connection between the battery and the electrical device.

[0097] This application provides an electrical device that uses a battery as its power source. The electrical device can be, but is not limited to, electronic devices, power tools, electric vehicles, drones, and energy storage devices. Electronic devices can include mobile phones, tablets, laptops, etc.; power tools can include electric drills, chainsaws, etc.; and electric vehicles can include electric cars, electric motorcycles, electric bicycles, etc.

[0098] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the battery 100 includes a housing 10 and a battery pack 20 including a plurality of battery cells 21; the battery pack 20 is housed within the housing 10; wherein, the housing 10 includes a first sub-housing 11 and a second sub-housing 12 arranged along a first direction X, the first sub-housing 11 includes a first portion 111, the second sub-housing 12 includes a second portion 121, the first portion 111 includes a first surface 1111 and a second surface 1112 arranged along a second direction Y, along the second direction Y, the first surface 1111 is closer to the battery pack 20 than the second surface 1112, the second portion 121 includes a third surface 1211 and a fourth surface 1212 arranged along the second direction Y, along the second direction Y, the third surface 1211 is closer to the battery pack 20 than the fourth surface 1212, the second portion 121... The first part 111 is closer to the battery pack 20; the first surface 1111 and the fourth surface 1212 form a first joint surface 13, the first sub-shell 11 and the second sub-shell 12 are joined by welding to form a first welded area 14. When viewed along the third direction Z, the first welded area 14 has a first region 141 that is farther away from the battery pack 20 than the first joint surface 13 in the second direction Y, and a second region 142 that is closer to the battery pack 20 than the first joint surface 13 in the second direction Y. The average length of the first region 141 in the second direction Y is a first length (not shown in the figure), and the distance between the first surface 1111 and the second surface 1112 in the second direction Y is a second length. The first length is less than the second length, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0099] The battery pack 20 includes multiple battery cells 21, where "multiple" means two or more. These multiple battery cells 21 are electrically connected, and can be connected in series, parallel, or a combination thereof. A combination thereof refers to a situation where multiple battery cells 21 are connected in both parallel and series connections. All the battery cells 21 connected in series, parallel, or a combination thereof form the battery pack 20.

[0100] Each cell 21 can be a rechargeable battery, including lithium-sulfur batteries, sodium-ion batteries, magnesium-ion batteries, solid-state batteries, etc., but not limited to these. The cell 21 can be cylindrical, flat, cuboid, or other shapes. The outer casing of the cell 21 can be in the form of a hard shell or a soft pack.

[0101] The first sub-shell 11 and the second sub-shell 12 define a space for accommodating the battery pack 20. Of course, the space defined by the first sub-shell 11 and the second sub-shell 12 can also accommodate other structures, such as circuit boards (not shown in the figure), temperature sensors (not shown in the figure), etc. This application does not limit this.

[0102] The first sub-shell 11 and the second sub-shell 12 can be made of various materials, such as steel, copper, aluminum, alloys, etc.

[0103] like Figure 2 , Figure 3 As shown, the first part 111 is part of the wall of the first sub-shell 11, and the second part 121 is part of the wall of the second sub-shell 12. The first part 111 and the second part 121 are stacked along the second direction Y, and in the second direction Y, the second part 121 is closer to the battery pack 20 than the first part 111, that is, along the second direction Y, the first part 111 is located outside the second part 121.

[0104] The first surface 1111 and the second surface 1112 are two planes opposite to each other along the second direction Y of the first part 111, and the first surface 1111 is closer to the battery pack 20 than the second surface 1112, that is, along the second direction Y, the first surface 1111 faces the second part 121.

[0105] The third surface 1211 and the fourth surface 1212 are two planes opposite each other in the second direction Y of the second part 121, and the third surface 1211 is closer to the battery pack 20 than the fourth surface 1212, that is, the fourth surface 1212 is set facing the first part 111.

[0106] The first surface 1111 and the fourth surface 1212 are bonded together to form a first mating surface 13. In some embodiments, the first surface 1111 may only be bonded to the fourth surface 1212 along the first direction X to form the first mating surface 13, and the other portion of the first surface 1111 along the first direction X may extend beyond the fourth surface 1212. The first surface 1111 may be entirely bonded to the fourth surface 1212 along the first direction X to form the first mating surface 13. In some embodiments, the fourth surface 1212 may only be bonded to the first surface 1111 along the first direction X to form the first mating surface 13, and the other portion of the fourth surface 1212 along the first direction X may extend beyond the first surface 1111. The fourth surface 1212 may be entirely bonded to the first surface 1111 along the first direction X to form the first mating surface 13. It should be noted that... Figure 3 In the figure, the reference numerals of the fourth surface 1212 and the first mating surface 13 both point to the same place, indicating that the first mating surface 13 is formed at the point where the fourth surface 1212 and the first surface 1111 are attached. Here, it refers to both the fourth surface 1212 and the first mating surface 13.

[0107] The first sub-shell 11 and the second sub-shell 12 are welded together to form a first welding area 14. The welding connection can be laser welding, ultrasonic welding, etc.

[0108] After the first part 111 and the second part 121 are welded, at least a portion of the first joint surface 13 along the first direction X is fused into the first welding area 14.

[0109] In an embodiment where a portion of the first mating surface 13 is fused to the first welding region 14 along the first direction X, such as Figure 3 , Figure 4As shown, the extension surface of the portion of the first bonding surface 13 that is not fused to the first welding area 14, extending along the first direction X and close to the first welding area 14, can be used as the interface between the first region 141 and the second region 142. The extension surface of the portion of the first bonding surface 13 that is not fused to the first welding area 14, extending along the first direction X and close to the first welding area 14, is defined as the first extension surface 143. That is, in the embodiment after a portion of the first bonding surface 13 along the first direction X is fused to the first welding area 14, the first region 141 of the first welding area 14 is farther away from the battery pack 20 in the second direction Y than the first extension surface 143, and the second region 142 of the first welding area 14 is closer to the battery pack 20 in the second direction Y than the second extension surface 173. It can also be understood that in the embodiment after a portion of the first bonding surface 13 along the first direction X is fused to the first welding area 14, the first region 141 is located on the side of the first extension surface 143 away from the battery pack 20, and the second region 142 is located on the side of the first extension surface 143 facing the battery pack 20. Figure 3 and Figure 4 The dashed line shown in the figure, which is connected to the first mating surface 13, is the extension surface of the portion of the first mating surface 13 that is not fused to the first welding area 14, extending in the first direction X and along the direction close to the first welding area 14, namely the first extension surface 143.

[0110] In an embodiment where the first bonding surface 13 is entirely fused to the first welding region 14 along the first direction X and the first surface 1111 is only partially attached to the second surface 1112 along the first direction X to form the first bonding surface 13, the extended surface of the portion of the first surface 1111 that is not attached to the second surface 1112, which extends along the first direction X and in a direction close to the first welding region 14, can serve as the interface between the first region 141 and the second region 142.

[0111] In an embodiment where the first bonding surface 13 is entirely fused to the first welding region 14 along the first direction X and the second surface 1112 is only partially attached to the first surface 1111 along the first direction X to form the first bonding surface 13, the portion of the second surface 1112 that is not attached to the first surface 1111 and extends along the first direction X and in a direction close to the first welding region 14 can serve as the interface between the first region 141 and the second region 142.

[0112] The average length of the first region 141 in the second direction Y refers to the average of the dimensions of multiple positions of the first region 141 in the first direction X along the second direction Y. For example, the first region 141 is divided into 10 equal parts along the first direction X and the dimensions of each part along the second direction Y at both ends of the first direction X are measured. A total of 11 dimensions along the second direction Y can be obtained. The average of these 11 dimensions is the average length of the first region 141, i.e., the first length.

[0113] The second length is the distance between the first surface 1111 and the second surface 1112 in the second direction Y, that is, the dimension of the first part 111 along the second direction Y, i.e., H1 in the figure.

[0114] The first sub-shell 11 and the second sub-shell 12 are joined by welding to form a first welding region 14. The first welding region 14 includes a first region 141 and a second region 142. The first region 141 is further away from the battery pack 20 relative to the first joint surface 13 in the second direction Y, and the second region 142 is closer to the battery pack 20 relative to the first joint surface 13 in the second direction Y. Since the second portion 121 is closer to the battery pack 20 relative to the first portion 111 along the second direction Y, and the average length of the first region 141 along the second direction Y is less than the distance between the first surface 1111 and the second surface 1112, the degree to which the first region 141 protrudes from the second surface 1112 along the second direction Y will be very small. In some embodiments, the second region 142 may not protrude from the second surface 1112 along the second direction Y, which facilitates the assembly of the battery 100 with other structures (such as the power supply body of the electrical device, charging device, etc.), reduces the risk of interference between the first welding region 14 and other structures, and reduces the risk of damage to other structures due to the first welding region 14 protruding from the second surface 1112. Furthermore, the degree to which the first region 141 protrudes from the second surface 1112 along the second direction Y is very small, or the second region 142 does not protrude from the second surface 1112 along the second direction Y, makes the appearance of the housing 10 at the welding position more flat, thereby improving the appearance quality of the housing 10.

[0115] To make the first length less than the second length, such as Figure 5 , Figure 6 As shown, in some embodiments, before the first part 111 and the second part 121 are welded, the fourth surface 1212 may have a receiving space 15. The receiving space 15 is used to receive a portion of the molten metal during welding, so as to reduce the height of the first welding area 14 protruding from the outer surface (second surface 1112) of the housing 10. The receiving space 15 may be a first recess 151 extending from the fourth surface 1212 toward the direction of the second direction Y toward the battery pack 20. The first surface 1111 and the first recess 151 are opposite to each other and close the opening of the first recess 151 on the fourth surface 1212. If welding is performed near the area corresponding to the first recess 151, a portion of the molten metal during the welding process will fill into the first recess 151, so that the side of the first area 141 away from the first joint surface 13 will be recessed in the second direction Y toward the interior of the battery pack 20, thereby making the first length less than the second length. Figure 7 In the figure, the reference numerals for the receiving space 15 and the first recess 151 point to the same location, indicating that at least part of the first recess constitutes the receiving space 15.

[0116] In some embodiments, such as Figure 7 , Figure 8 As shown, a receiving space 15 can also be formed on the first surface 1111. In this embodiment, the receiving space 15 can be a second recess 152 extending from the first surface 1111 toward the direction away from the battery pack 20 along the second direction Y. The fourth surface 1212 and the second recess 152 are opposite to and close the opening of the second recess 152 on the first surface 1111. Welding is performed near the area corresponding to the second recess 152. A portion of the molten metal during the welding process will fill the second recess 152, so that the side of the first region 141 away from the first joint surface 13 will be recessed along the second direction Y close to the inside of the battery pack 20, so that the first length is less than the second length.

[0117] In some embodiments, such as Figure 9 , Figure 10 As shown, both the first surface 1111 and the fourth surface 1212 may have a receiving space 15. The receiving space 15 on the fourth surface 1212 may be a first recess 151 extending from the fourth surface 1212 toward the battery pack 20 along the second direction Y. The receiving space 15 on the first surface 1111 may be a second recess 152 extending from the first surface 1111 toward the battery pack 20 along the second direction Y. The first recess 151 and the second recess 152 are arranged opposite to each other. Welding is performed near the corresponding areas of the first recess 151 and the second recess 152. During the welding process, a portion of the molten metal will fill the first recess 151 and the second recess 152, so that the side of the first region 141 away from the first joint surface 13 will be recessed along the second direction Y toward the inside of the battery pack 20, thereby making the first length less than the second length.

[0118] The shapes of the first recess 151 and the second recess 152 may be the same or different. The first recess 151 and the second recess 152 may be rectangular grooves, arc-shaped grooves, etc.

[0119] The receiving space 15 can extend along the third direction Z to both ends of the housing 10 along the third direction Z, that is, the first recess 151 can extend along the third direction Z to both ends of the second sub-housing 12. The second recess 152 can extend along the third direction Z to both ends of the first sub-housing 11. Alternatively, the receiving space 15 can not extend along the third direction Z to both ends of the housing 10 along the third direction Z, that is, the first recess 151 may not extend to both ends of the second sub-housing 12 along the third direction Z, and the second recess 152 may not extend to both ends of the first sub-housing 11 along the third direction Z.

[0120] It should be noted that, since the accommodating space 15 contains the molten metal during the welding process, in the above embodiment, the accommodating space 15 is fused to the first welding area 14 after welding is completed.

[0121] In some embodiments, after the welding process is completed on the outer surface of the casing, the portion of the first welding area that protrudes from the second surface in the second direction is treated by car washing or manual grinding, so that the welding area forms a certain recessed area on the second surface. This facilitates marking or positioning when the battery is assembled with other structures. The recessed area helps to reduce the risk of interference between the first welding area and other structures, as well as the risk of damage to other structures due to the first welding area protruding from the second surface.

[0122] In some embodiments, when welding is performed on the outer surface of the casing, some molten metal is removed by blowing with inert gas, so that the welding area forms a certain recessed area on the second surface. This facilitates marking or positioning of the battery when it is assembled with other structures. The recessed area helps to reduce the risk of interference between the first welding area and other structures, as well as the risk of damage to other structures due to the first welding area protruding from the second surface.

[0123] In some embodiments, the distance between the third surface 1211 and the fourth surface 1212 along the second direction Y is a third length, and the second length is less than the third length.

[0124] The third length is the distance between the third surface 1211 and the fourth surface 1212 along the second direction Y, i.e., H2 in the figure.

[0125] The second length being less than the third length facilitates welding through the first part 111 to the second part 121 during the welding process, reducing the welding difficulty between the first part 111 and the second part 121. The second length being less than the third length, i.e., the third length being greater than the second length, reduces the risk of the second part 121 being welded through during the welding process, ensuring that the structural strength of the second part 121 meets the usage requirements while improving welding quality. The third length being greater than the second length helps reduce the risk of high-temperature damage to the internal structure of the shell 10 during welding. Furthermore, the third length being greater than the second length allows for a larger overall dimension of the first part 111 and the second part 121 along the second direction Y, which helps the shell 10 have better structural strength at the point where the first part 111 and the second part 121 mate.

[0126] In embodiments where the second length is less than the third length, optionally, the ratio of the second length to the third length is less than or equal to 1 / 2.

[0127] That is, H1 / H2 ≤ 1 / 2. For example, H1 / H2 = 1 / 2, H1 / H2 = 1 / 3, H1 / H2 = 1 / 4, H1 / H2 = 1 / 5, H1 / H2 = 1 / 6, H1 / H2 = 1 / 7, H1 / H2 = 1 / 8, H1 / H2 = 1 / 9, H1 / H2 = 1 / 10, etc.

[0128] The ratio of the second length to the third length is less than or equal to 1 / 2, which further facilitates welding through the first part 111 to the second part 121 during the welding process, reducing the welding difficulty between the first part 111 and the second part 121. The ratio of the second length to the third length is less than or equal to 1 / 2, meaning the ratio of the third length to the second length is greater than or equal to 2, making it more difficult for the second part 121 to be welded through during the welding process. This improves welding quality while ensuring that the structural strength of the second part 121 meets the usage requirements.

[0129] Of course, in other embodiments, the ratio of the second length to the third length may also be greater than 1 / 2.

[0130] In other embodiments, the second length may be equal to or greater than the third length, and can be selected according to actual needs, so as to meet the welding requirements and the strength requirements of the battery 100 on the casing 10.

[0131] In some embodiments, the average length of the second region 142 in the second direction Y is a fourth length (not shown in the figure), which is greater than the first length.

[0132] The average length of the second region 142 in the second direction Y refers to the average of the dimensions of multiple positions of the second region 142 in the first direction X along the second direction Y. For example, the second region 142 is divided into 10 equal parts along the first direction X and the dimensions of each part along the second direction Y at both ends of the first direction X are measured. A total of 11 dimensions along the second direction Y can be obtained. The average of these 11 dimensions is the average length of the second region 142, that is, the fourth length.

[0133] If the fourth length is greater than the first length, the welding depth of the second part 121 is greater, which is beneficial to improving the welding strength of the first part 111 and the second part 121, thereby making the connection stability between the first sub-shell 11 and the second sub-shell 12 better.

[0134] Of course, the fourth length can also be less than the first length, in which case the risk of the second part 121 being welded through during the welding process is relatively small, or the fourth length can also be equal to the first length.

[0135] In some embodiments, the ratio of the fourth length to the third length is less than or equal to 2 / 3, which helps to reduce the risk of welding through the second part 121 and reduce the problem of deformation of the second part 121 during the welding process, thereby improving the welding quality and ensuring that the structural strength of the second part 121 meets the usage requirements.

[0136] In some embodiments, the first welding region 14 extends along a third direction Z.

[0137] The length of the first welding region 14 extending along the third direction Z can be related to the length of the first mating surface 13 along the third direction Z. For example, the two ends of the first welding region 14 along the third direction Z can be flush with the two ends of the first mating surface 13 along the third direction Z, or at least one end of the first mating surface 13 along the third direction Z can extend beyond one end of the first welding region 14 along the third direction Z, or at least one end of the first welding region 14 along the third direction Z can extend beyond one end of the first mating surface 13 along the third direction Z.

[0138] The length of the first welding area 14 extending along the third direction Z can be related to the length of the receiving space 15 along the third direction Z. For example, along the third direction, the length of the first welding area 14 is less than the length of the receiving space 15, or the length of the first welding area 14 is equal to the length of the receiving space 15, or the length of the first welding area 14 is greater than the length of the receiving space 15.

[0139] The first welding area 14 extends along the third direction Z, increasing the connection area of ​​the first sub-shell 11 and the second sub-shell 12 along the third direction Z, thereby improving the connection stability between the first sub-shell 11 and the second sub-shell 12.

[0140] In some embodiments, such as Figures 3-10 As shown, when viewed along the first direction X, the first part 111 and the second sub-shell 12 overlap.

[0141] like Figures 5-11 As shown, before the first sub-shell 11 and the second sub-shell 12 are welded, the second sub-shell 12 further includes a first end face 122, the first end face 122 faces the first portion 111 along the first direction X, and the second portion 121 protrudes from the first end face 122 along the first direction X.

[0142] The first end face 122 and the fourth surface 1212 are connected. The first end face 122 and the fourth surface 1212 together define the first receiving portion C1. Figure 7As shown in the diagram, the first receiving portion C1 may be L-shaped. At least a portion of the first portion 111 is received within the first receiving portion such that, when viewed along the first direction X, the first portion 111 overlaps with the second sub-shell 12. In an embodiment where a first recess 151 is provided on the fourth surface 1212 before the first sub-shell 11 and the second sub-shell 12 are welded, the first recess 151 may extend along the first direction X to the first end face 122. Of course, the first recess 151 may not extend to the first end face 122. Figure 7 The rectangular dashed box indicated by the number C1 represents a portion of the first receiving part.

[0143] Along the first direction X, the first portion 111 has a second end face 1113 facing the first end face 122. Before the first sub-shell 11 and the second sub-shell 12 are welded, the first end face 122 and the second end face 1113 abut against each other, that is, the first end face 122 and the second end face 1113 are in contact. After welding, the first end face 122 and the second end face 1113 are fused into the first welding area 14. In an embodiment where a second recess 152 is provided on the first surface 1111 before the first sub-shell 11 and the second sub-shell 12 are welded, the second recess 152 may extend to the second end face 1113 along the first direction X. Of course, the second recess 152 may not extend to the second end face 1113.

[0144] Along the second direction Y, the first portion 111 is at least partially received within the first receiving portion C1. The second sub-shell 12 also includes a first side surface 123, which is parallel to the fourth surface 1212 and connected to the first end face 122. The first side surface 123 is part of the outer surface of the second sub-shell 12 (or the outer surface of the shell 10). In embodiments where a portion of the first portion 111 is received within the first receiving portion along the second direction Y, the second surface 1112 protrudes beyond the first side surface 123 along the second direction Y. In embodiments where the first portion 111 is completely received within the receiving portion along the second direction Y, the first side surface 123 may protrude beyond the second surface 1112 along the second direction Y, or the first side surface 123 and the second surface 1112 may be coplanar or flush. Figures 3-10 The diagram shows the case where the first side surface 123 and the second surface 1112 are coplanar (which can be understood as being flush).

[0145] When viewed along the first direction X, the first part 111 and the second sub-shell 12 overlap, so the first part 111 and the second sub-shell 12 share a portion of space, which can reduce the size of the overall structure formed by the first part 111 and the second sub-shell 12, which is beneficial to reducing the overall size of the shell 10, thereby helping to reduce the size of the battery 100 and to miniaturize the structure of the battery 100.

[0146] like Figure 3 , Figure 5 , Figure 8 , Figure 10 As shown, in some embodiments, along the first direction X, the first sub-shell 11 includes a fifth surface 112 facing the second portion 121, the first portion 111 protruding from the fifth surface 112, the second portion 121 includes a sixth surface 1213 facing the fifth surface 112, a first gap D1 exists between the fifth surface 112 and the sixth surface 1213, and the first gap D1 is filled with colloid E.

[0147] The fifth surface 112 is connected to the first surface 1111. A sixth surface 1213 is disposed along the fifth surface 112 in the first direction X, and one end of the sixth surface 1213 is connected to the fourth surface 1212 along the second direction Y. A first gap D1 is the space between the fifth surface 112 and the sixth surface 1213. The colloid E filling the first gap D1 can be an adhesive structure capable of bonding the second part 121 and the first sub-shell 11. In some embodiments, the colloid E filling the first gap D1 can be one of epoxy resin, polyurethane, silicone, or neoprene rubber.

[0148] Along the first direction X, a first gap D1 exists between the fifth surface 112 of the first sub-shell 11 and the sixth surface 1213 of the second part 121, providing deformation space for the deformation of the first part 111 and the second part 121 during the welding process. The first gap D1 is filled with colloid E, allowing the first sub-shell 11 and the second part 121 to connect through the colloid E filled within the first gap D1. This increases the connection area between the first sub-shell 11 and the second sub-shell 12, thereby improving the connection stability of the first sub-shell 11 and the second sub-shell 12. The filling of the first gap D1 with colloid E also helps to improve the airtightness between the first sub-shell 11 and the second sub-shell 12.

[0149] In some other embodiments, the first gap D1 may not be filled with colloid E.

[0150] like Figure 12 As shown, in some other embodiments, the fifth surface 112 and the sixth surface 1213 may also abut against each other, that is, the fifth surface 112 and the sixth surface 1213 are attached together, and there is no gap between the fifth surface 112 and the sixth surface 1213.

[0151] In some embodiments, the sixth surface 1213 and the fourth surface 1212 can be directly connected (e.g., Figure 12 (As shown), indirect connection is also possible. For example... Figure 3 , Figure 5 , Figure 8 , Figure 10As shown, the sixth surface 1213 and the fourth surface 1212 are connected by a first chamfered surface 1214, so that the sixth surface 1213 and the fourth surface 1212 are transitionally connected by the first chamfered surface 1214. The first chamfered surface 1214 can be a bevel or a circular arc surface.

[0152] like Figure 3 , Figure 5 , Figure 8 , Figure 10 , Figure 12 As shown, in some embodiments, the first sub-shell 11 further includes a third portion 113 protruding from the fifth surface 112 along the first direction X and along the second direction Y, the third portion 113 and the first portion 111 are arranged at intervals relative to each other, and the second portion 121 is inserted between the first portion 111 and the third portion 113.

[0153] The second part 121 may be partially or entirely inserted between the third part 113 and the first part 111.

[0154] In some embodiments, before the first sub-housing 11 and the second sub-housing 12 are welded, along the first direction X, the size of the third portion 113 is smaller than the size of the first portion 111, and along the second direction Y, the distance between the first surface 1111 and the second surface 1112 is smaller than the size of the third portion 113. Figure 5 , Figure 8 , Figure 10 As shown, before the first sub-shell 11 and the second sub-shell 12 are welded, the dimension of the first part 111 along the first direction X is the distance between the fifth surface 112 and the second end face 1113, i.e., H3 in the figure. The dimension of the third part 113 along the first direction X is the distance between the fifth surface 112 and the surface of the third part 113 furthest from the fifth surface 112 along the first direction X, i.e., L1 in the figure, where L1 < H3. The dimension of the third part 113 along the second direction Y is the distance between the surface of the third part 113 closest to the first part 111 and the surface of the third part 113 furthest from the first part 111 along the second direction Y, i.e., L3 in the figure, where H1 < L3.

[0155] The second part 121 is inserted between the first part 111 and the third part 113. The first part 111 and the third part 113 can respectively limit the second part 121 on both sides along the second direction Y, reducing the deformation of the second part 121 during the welding process, thereby improving the welding quality of the first part 111 and the second part 121, and further improving the connection stability of the first sub-shell 11 and the second sub-shell 12.

[0156] like Figure 3 , Figure 5 , Figure 8 , Figure 10 , Figure 12 , Figure 13 As shown, in some embodiments, a first receiving groove 1215 is formed on the third surface 1211 along the second direction Y and along the first direction X.

[0157] The first receiving groove 1215 extends to the sixth surface 1213, and at least a portion of the third portion 113 is received within the first receiving groove 1215.

[0158] The first receiving groove 1215 is recessed from the third surface 1211 in the second direction Y, away from the battery pack 20, and extends along the first direction X to the sixth surface 1213 of the second portion 121. The first receiving groove 1215 has slots formed on both the third surface 1211 and the sixth surface 1213. When the second portion 121 is inserted between the first portion 111 and the third portion 113 along the first direction X, the third portion 113 simultaneously enters the first receiving groove 1215 from the slot located on the sixth surface 1213.

[0159] The third part 113 may be partially or entirely contained within the first receiving groove 1215. In an embodiment where only a portion of the third part 113 is contained within the first receiving groove 1215, the third part 113 may be entirely contained within the first receiving groove 1215 along the first direction X, a portion of the third part 113 along the second direction Y may be contained within the first receiving groove 1215, and another portion of the third part 113 along the second direction Y may extend from the opening of the first receiving groove 1215 located on the third surface 1211; or the third part 113 may be partially contained within the first receiving groove 1215 along the first direction X, and the entire third part 113 along the second direction Y may be contained within the first receiving groove 1215. In an embodiment where the third portion 113 is entirely accommodated in the first receiving groove 1215 along the second direction Y, the third surface 1211 of the second portion 121 may extend beyond the surface of the third portion 113 away from the first portion 111, or the third surface 1211 of the second portion 121 may be flush with the surface of the third portion 113 away from the first portion 111. Figure 3 , Figure 5 , Figure 10 , Figure 12 The third surface 1211 of the second part 121 is shown to be flush with the surface of the third part 113 that is away from the first part 111.

[0160] The third surface 1211 of the second part 121 has a first receiving groove 1215. At least a portion of the third part 113 is received in the first receiving groove 1215. The third part 113 and the second part 121 are more compact, which is beneficial to reducing the overall structural size of the first sub-shell 11 and the second sub-shell 12, thereby helping to reduce the structural size of the battery 100 and miniaturize the battery 100 structure.

[0161] like Figure 3 , Figure 5 , Figure 8 , Figure 10 , Figure 12 , Figure 13 As shown, in some embodiments, along the second direction Y, the first receiving groove 1215 has a first wall 1215a facing the third portion 113, the third portion 113 includes a seventh surface 1131 disposed facing the first wall 1215a, there is a second gap D2 between the first wall 1215a and the seventh surface 1131, and the second gap D2 is filled with colloid E.

[0162] The first wall 1215a is a portion of the wall surface of the first receiving groove 1215. The first wall 1215a is connected to the sixth surface 1213. The first wall 1215a and the sixth surface 1213 may be directly connected. Figure 12 (As shown in the diagram). The first wall 1215a and the sixth surface 1213 can also be indirectly connected, such as... Figure 3 , Figure 5 , Figure 7 , Figure 10 , Figure 13 As shown, the sixth surface 1213 and the first wall 1215a are connected by a second chamfered surface 1216, so that the sixth surface 1213 and the first wall 1215a are transitionally connected by the second chamfered surface 1216. The second chamfered surface 1216 can be a bevel or a circular arc surface.

[0163] The second gap D2 is the space between the first wall 1215a and the seventh surface 1131. The colloid E filling the second gap D2 can be an adhesive structure capable of bonding the third part 113 and the second part 121. In some embodiments, the colloid E filling the second gap D2 can be one of epoxy resin, polyurethane, silicone, and neoprene rubber.

[0164] In an embodiment where a first gap D1 exists between the sixth surface 1213 and the fifth surface 112, the first gap D1 and the second gap D2 are connected. The colloid E may be applied between the first portion 111 and the third portion 113 before the second portion 121 is inserted into the first portion 111 and the third portion 113. During the insertion of the second portion 121 between the first portion 111 and the third portion 113 along the first direction X, the fourth surface 1212 of the second portion 121 adheres to the first surface 1111 of the first portion 111, and the second portion 121 moves along the first direction X to allow the second portion 121 to be inserted between the first portion 111 and the third portion 113, facilitating welding of the first portion 111 and the second portion 121. As the second part 121 is gradually inserted between the first part 111 and the third part 113, as the space between the sixth surface 1213 and the fifth surface 112 gradually decreases, the colloid located between the sixth surface 1213 and the fifth surface 112 may be squeezed from between the sixth surface 1213 and the fifth surface 112 into the space between the first wall 1215a and the seventh surface 1131. That is, the colloid E in the first gap D1 may be squeezed into the second gap D2. Therefore, the colloid E filled in the second gap D2 can be the colloid E in the first gap D1 squeezed into the second gap D2. In this way, the third part 113 can reduce the risk of colloid overflow into the interior of the shell 10.

[0165] Of course, the colloid E within the second gap D2 can also be filled separately.

[0166] Along the second direction Y, a second gap D2 exists between the first wall 1215a of the first receiving groove 1215 and the seventh surface 1131 of the third part 113, facilitating the insertion of the second part 121 between the first part 111 and the third part 113. When the second part 121 is welded to the first part 111, the second gap D2 also provides deformation space for the second part 121. The second gap is filled with colloid, allowing the third part 113 and the second part 121 to be connected via colloid E filled within the second gap D2. This increases the connection area between the first sub-shell 11 and the second sub-shell 12, thereby improving the connection stability of the first sub-shell 11 and the second sub-shell 12. The colloid E filling the second gap D2 also helps improve the airtightness between the first sub-shell 11 and the second sub-shell 12.

[0167] In other embodiments, the second gap D2 may not be filled with colloid E.

[0168] like Figure 14 As shown, in some other embodiments, the first wall 1215a and the seventh surface 1131 can also abut against each other, that is, the first wall 1215a and the seventh surface 1131 are attached together, and there is no gap between the first wall 1215a and the seventh surface 1131.

[0169] like Figure 3 , Figure 5 , Figure 8 , Figure 10 , Figure 12 , Figure 14 As shown, in some embodiments, along the first direction X, the third portion 113 includes an eighth surface 1132, the first receiving groove 1215 includes a second wall 1215b disposed facing the eighth surface 1132, a third gap D3 exists between the eighth surface 1132 and the second wall 1215b, and the third gap D3 is filled with colloid E.

[0170] The eighth surface 1132 is the surface of the third part 113 that is furthest from the fifth surface 112 along the first direction X. It can be understood that the eighth surface 1132 is the surface of the third part 113 that is closest to the second sub-shell 12 along the first direction X.

[0171] The eighth surface 1132 is connected to the seventh surface 1131. The seventh surface 1131 and the eighth surface 1132 can be directly connected. Alternatively, the seventh surface 1131 and the eighth surface 1132 can be indirectly connected, such as... Figure 3 , Figure 5 , Figure 8 , Figure 10 , Figure 12 , Figure 14 As shown, the seventh surface 1131 and the eighth surface 1132 are connected by a third chamfered surface 1133, so that the seventh surface 1131 and the eighth surface 1132 are transitionally connected by the third chamfered surface 1133. The third chamfered surface 1133 can be a bevel or a curved surface. The figure shows the case where the third chamfered surface 1133 is a bevel. The third chamfered surface 1133 can guide the second part 121 to be inserted between the first part 111 and the third part 113, making it easier for the second part 121 to be inserted between the first part 111 and the third part 113.

[0172] The second wall 1215b is part of the wall surface of the first receiving groove 1215. The second wall 1215b is connected to the first wall 1215a.

[0173] The third spacing D3 is the space between the eighth surface 1132 and the second wall 1215b along the first direction X. The colloid E filling the third spacing D3 can be an adhesive structure capable of bonding the third part 113 and the second part 121. In some embodiments, the colloid E filling the third spacing D3 can be one of epoxy resin, polyurethane, silicone, and neoprene rubber.

[0174] In an embodiment where a first gap D1 exists between the sixth surface 1213 and the fifth surface 112, and a second gap D2 exists between the first wall 1215a and the seventh surface 1131, the first gap D1, the second gap D2, and the third gap D3 are connected. The colloid E can be applied between the first portion 111 and the third portion 113 before the second portion 121 is inserted into the first portion 111 and the third portion 113. During the insertion of the second portion 121 between the first portion 111 and the third portion 113 along the first direction X, the fourth surface 1212 of the second portion 121 adheres to the first surface 1111 of the first portion 111, and the second portion 121 moves along the first direction X to allow the second portion 121 to be inserted between the first portion 111 and the third portion 113, facilitating welding of the first portion 111 and the second portion 121. As the second part 121 is gradually inserted between the first part 111 and the third part 113, as the space between the sixth surface 1213 and the fifth surface 112 gradually decreases, the colloid E located between the sixth surface 1213 and the fifth surface 112 may be squeezed from between the sixth surface 1213 and the fifth surface 112 into the space between the first wall 1215a and the seventh surface 1131, and squeezed into the space between the second wall 1215b and the eighth surface 1132. That is, the colloid E in the first gap D1 may be squeezed into the second gap D2 and from the second gap D2 into the third gap D3. Therefore, the colloid E filled in the second gap D2 and the third gap D3 can be the colloid E in the first gap D1 squeezed into the second gap D2 and the third gap D3. In this way, the third part 113 can reduce the risk of colloid overflow into the interior of the shell 10.

[0175] Along the first direction X, a third gap D3 exists between the eighth surface 1132 of the third part 113 and the second wall 1215b of the first receiving groove 1215. When the second part 121 is welded to the first part 111, the third gap D3 provides deformation space for the second part 121. The third gap D3 is filled with colloid E, allowing the third part 113 and the second part 121 to be connected through the colloid E within the third gap D3. This increases the connection area between the first sub-shell 11 and the second sub-shell 12, thereby improving the connection stability of the first sub-shell 11 and the second sub-shell 12. The colloid E filling the third gap D3 also helps improve the airtightness between the first sub-shell 11 and the second sub-shell 12.

[0176] In some embodiments, along the first direction X, the size of the third portion 113 is L1, and the distance between the fifth surface 112 and the second wall 1215b is L2, where L1 < L2.

[0177] The dimension L1 of the third part 113 along the first direction X is the distance between the fifth surface 112 and the third part 113 along the first direction X that is furthest from the first surface 1111, i.e., the distance between the fifth surface 112 and the eighth surface 1132 along the first direction X. If L1 < L2, then along the first direction X, a gap can be formed between the end of the third part 113 furthest from the fifth surface 112 and the second wall 1215b. This gap provides deformation space for the second part 121 when it is welded to the first part 111. This gap can also be used to fill colloid, allowing the third part 113 and the second part 121 to be connected by colloid filled within the gap. This increases the connection area between the first sub-shell 11 and the second sub-shell 12, thereby improving the connection stability and airtightness of the first sub-shell 11 and the second sub-shell 12.

[0178] In some embodiments, 2mm ≤ L1 ≤ 4mm.

[0179] For example, L1 can be 2mm, 2.3mm, 2.5mm, 2.7mm, 3mm, 3.3mm, 3.5mm, 3.7mm, 4mm, etc.

[0180] If L1 < 2mm, the dimension of the third part 113 along the first direction X is too small to meet the limiting requirement for the second part 121. If L1 > 4mm, the dimension of the third part 113 along the first direction X is too large, which may make it difficult to insert the second part 121 between the first part 111 and the fourth part 114, thus increasing the assembly difficulty of the first sub-shell 11 and the second sub-shell 12. Therefore, 2mm ≤ L1 ≤ 4mm allows the third part 113 to limit the second part 121 and also facilitates the insertion of the second part 121 between the first part 111 and the third part 113, thereby facilitating the assembly of the first sub-shell 11 and the second sub-shell 12.

[0181] In some embodiments, along the second direction Y, the dimension of the third portion 113 is L3, where 1.5mm≤L3≤3mm.

[0182] The dimension L3 of the third part 113 along the second direction Y is the distance along the second direction Y between the surface of the third part 113 closest to the first part 111 and the surface of the third part 113 furthest from the first part 111 along the second direction Y.

[0183] For example, L3 can be 1.5mm, 1.7mm, 2mm, 2.3mm, 2.5mm, 2.7mm, 3mm, etc.

[0184] If L3 < 1.5 mm, the dimension of the third part 113 along the second direction Y is too small, and the strength of the third part 113 is weak. If L3 > 3 mm, the dimension of the third part 113 along the second direction Y is large, and it needs to occupy a large space. Therefore, 1.5 mm ≤ L3 ≤ 3 mm can make the third part 113 have good strength so that the third part 113 can better limit the second part 121, and the space occupied by the third part 113 is small, which is conducive to reducing the size of the overall structure composed of the first sub-shell 11 and the second sub-shell 12.

[0185] like Figure 15 As shown, in some other embodiments, the first sub-shell 11 may also not include the third portion 113. The first surface 1111 and the fifth surface 112 of the first portion 111 together define an L-shaped second receiving portion that receives the second portion 121.

[0186] In some embodiments, the first sub-shell 11 further includes a fourth portion 114, and the second sub-shell 12 further includes a fifth portion 124. The fourth portion 114 includes a ninth surface 1141 and a tenth surface 1142 arranged along the second direction Y. Along the second direction Y, the ninth surface 1141 is closer to the battery pack 20 than the tenth surface 1142. The fifth portion 124 includes an eleventh surface 1241 and a twelfth surface 1242 arranged along the second direction Y. Along the second direction Y, the eleventh surface 1241 is closer to the battery pack 20 than the twelfth surface 1242, and the fourth portion 114 is closer to the battery pack 20 than the fifth portion 124. Surface 1142 and eleventh surface 1241 form a second mating surface 16. The first sub-shell 11 and the second sub-shell 12 are joined by welding to form a second welding region 17. Viewed along the third direction Z, the second welding region 17 has a third region 171 that is farther away from the battery pack 20 than the second mating surface 16 in the second direction Y, and a fourth region 172 that is closer to the battery pack 20 than the second mating surface 16 in the second direction Y. The average length of the third region 171 in the second direction Y is a fifth length. The distance between the eleventh surface 1241 and the twelfth surface 1242 in the second direction Y is a sixth length. The fifth length is less than the sixth length.

[0187] like Figure 2 , Figure 16 , Figure 17 As shown, the fourth part 114 is part of the wall of the first sub-shell 11, and the fifth part 124 is part of the wall of the second sub-shell 12. The fourth part 114 and the fifth part 124 are stacked along the second direction Y, and the fourth part 114 is closer to the battery pack 20 than the fifth part 124 in the second direction Y, that is, the fifth part 124 is located outside the fourth part 114 along the second direction Y.

[0188] The ninth surface 1141 and the tenth surface 1142 are two planes opposite each other in the second direction Y of the fourth part 114, and the ninth surface 1141 is closer to the battery pack 20 than the tenth surface 1142, that is, the tenth surface 1142 is set facing the fifth part 124 in the second direction Y.

[0189] The eleventh surface 1241 and the twelfth surface 1242 are two planes opposite each other in the second direction Y of the fifth part 124, and the eleventh surface 1241 is closer to the battery pack 20 than the twelfth surface 1242, that is, the eleventh surface 1241 is set facing the fourth part 114.

[0190] The tenth surface 1142 and the eleventh surface 1241 are bonded together to form a second mating surface 16. The eleventh surface 1241 may only be bonded to a portion of the tenth surface 1142 along the first direction X to form the second mating surface 16, while the remaining portion of the eleventh surface 1241 along the first direction X may extend beyond the tenth surface 1142. The eleventh surface 1241 may be entirely bonded to the tenth surface 1142 along the first direction X to form the second mating surface 16. Alternatively, the tenth surface 1142 may only be bonded to a portion of the eleventh surface 1241 along the first direction X to form the second mating surface 16, while the remaining portion of the tenth surface 1142 along the first direction X may extend beyond the eleventh surface 1241. The tenth surface 1142 may be entirely bonded to the eleventh surface 1241 along the first direction X to form the second mating surface 16.

[0191] The first sub-shell 11 and the second sub-shell 12 are welded together at positions 114 and 124, respectively, to form a second welding area 17. The welding connection can be achieved through laser welding, ultrasonic welding, or similar methods.

[0192] Similar to the first mating surface 13, after the fourth part 114 and the fifth part 124 are welded, at least a portion of the second mating surface 16 along the first direction X is fused into the second welding area 17.

[0193] In an embodiment where a portion of the second mating surface 16 is fused to the second welding region 17 along the first direction X, such as Figure 16 and Figure 17As shown, the portion of the second bonding surface 16 that is not fused to the second welding area 17 extends along the first direction X and the direction close to the second welding area 17, which can be used as the interface between the third region 171 and the fourth region 172. The portion of the second bonding surface 16 that is not fused to the second welding area 17 extends along the first direction X and the direction close to the second welding area 17 as the second extension surface 173. That is, in the embodiment after a portion of the second bonding surface 16 is fused to the second welding area 17 along the first direction X, the third region 171 of the second welding area 17 is farther away from the battery pack 20 in the second direction Y than the second extension surface 173, and the fourth region 172 of the second welding area 17 is closer to the battery pack 20 in the second direction Y than the second extension surface 173. It can also be understood that in the embodiment after a portion of the second bonding surface 16 is fused to the second welding area 17 along the first direction X, the third region 171 is located on the side of the second extension surface 173 away from the battery pack 20, and the fourth region 172 is located on the side of the second extension surface 173 facing the battery pack 20. Figure 17 The dashed line shown in the figure, which is connected to the second mating surface 16, is the part of the second mating surface 16 that is not fused to the second welding area 17 and extends along the first direction X and in the direction close to the second welding area 17, namely the second extension surface 173.

[0194] In an embodiment where the second mating surface 16 is entirely fused to the second welding region 17 along the first direction X and the tenth surface 1142 is only partially attached to the eleventh surface 1241 along the first direction X to form the second mating surface 16, the portion of the tenth surface 1142 that is not attached to the eleventh surface 1241 can serve as the interface between the third region 171 and the fourth region 172 along the first direction X and in the direction close to the second welding region 17.

[0195] In an embodiment where the second mating surface 16 is entirely fused to the second welding region 17 along the first direction X and the eleventh surface 1241 is only partially attached to the tenth surface 1142 along the first direction X to form the second mating surface 16, the portion of the eleventh surface 1241 that is not attached to the tenth surface 1142 can serve as the interface between the third region 171 and the fourth region 172 along the first direction X and the extension surface of the eleventh surface 1241 in the direction close to the second welding region 17.

[0196] The average length of the third region 171 in the second direction Y refers to the average of the dimensions of multiple positions of the third region 171 in the first direction X along the second direction Y. For example, the third region 171 is divided into 10 equal parts along the first direction X and the dimensions of each part along the second direction Y at both ends of the first direction X are measured. A total of 11 dimensions along the second direction Y can be obtained. The average of these 11 dimensions is the average length of the third region 171, which is the fifth length.

[0197] The sixth length is the distance between the eleventh surface 1241 and the twelfth surface 1242 in the second direction Y, that is, the dimension of the fifth part 124 along the second direction Y. Figure 12 H4 in .

[0198] The first sub-shell 11 and the second sub-shell 12 are joined by welding to form a second welding region 17. The second welding region 17 includes a third region 171 and a fourth region 172. The third region 171 is further away from the battery pack 20 relative to the first joint surface 13 in the second direction Y, and the fourth region 172 is closer to the battery pack 20 relative to the first joint surface 13 in the second direction Y. Since the fourth portion 114 is closer to the battery pack 20 relative to the fifth portion 124 in the second direction Y, and the average length of the third region 171 in the second direction Y is less than the distance between the ninth surface 1141 and the tenth surface 1142, the degree to which the third region 171 protrudes from the twelfth surface 1242 in the second direction Y will be very small. In some embodiments, the third region 171 may not protrude from the twelfth surface 1242 in the second direction Y, which facilitates the assembly of the battery 100 with other structures, reduces the risk of interference between the second welding region 17 and other structures, and reduces the risk of damage to other structures due to the second welding region 17 protruding from the twelfth surface 1242. Furthermore, the third region 171 protrudes very little from the twelfth surface 1242 along the second direction Y, or the third region does not protrude from the twelfth surface 1242 along the second direction, making the appearance of the housing 10 at the welding position smoother, thereby improving the appearance quality of the housing 10.

[0199] Furthermore, the first sub-shell 11 and the second sub-shell 12 are welded together at two different locations, forming a first welding area 14 and a second welding area 17 respectively, which can improve the connection stability of the first sub-shell 11 and the second sub-shell 12.

[0200] In order to make the fifth length less than the sixth length, such as Figure 18 , Figure 19As shown, in some embodiments, before the fourth part 114 and the fifth part 124 are welded, the tenth surface 1142 may have a third recess 11421. The space formed by the third recess 11421 is used to accommodate a portion of the molten metal during welding, thereby reducing the height of the second welding area 17 protruding from the outer surface (twelfth surface 1242) of the housing 10. The third recess 11421 is recessed from the tenth surface 1142 towards the battery pack 20 along the second direction Y. The eleventh surface 1241 and the third recess 11421 are opposite to and close the opening of the third recess 11421 on the tenth surface 1142. If welding is performed near the area corresponding to the third recess 11421, a portion of the molten metal during the welding process will fill the third recess 11421, thereby causing the side of the third region 171 facing away from the second joint surface 16 to be recessed in the second direction Y towards the interior of the battery pack 20, thus making the fifth length less than the sixth length.

[0201] Of course, such as Figure 20 , Figure 21 As shown, a fourth recess 12411 can also be formed on the eleventh surface 1241. The fourth recess 12411 can be recessed from the eleventh surface 1241 in a direction away from the battery pack 20 along the second direction Y. The tenth surface 1142 and the fourth recess 12411 are opposite to and close the opening of the fourth recess 12411 on the eleventh surface 1241. Welding is performed near the area corresponding to the fourth recess 12411. A portion of the molten metal in the welding process will fill the fourth recess 12411, so that the side of the third region 171 away from the second joint surface 16 will be recessed in the second direction Y along the direction close to the inside of the battery pack 20, so that the fifth length is less than the sixth length.

[0202] like Figure 22 , Figure 23 As shown, a third recess 11421 and a fourth recess 12411 can also be provided on the tenth surface 1142 and the eleventh surface 1241, respectively. The third recess 11421 and the fourth recess 12411 are arranged opposite to each other. If welding is performed near the corresponding areas of the third recess 11421 and the fourth recess 12411, a portion of the molten metal during the welding process will fill into the third recess 11421 and the fourth recess 12411. This causes the side of the third region 171 facing away from the second joint surface 16 to be recessed along the second direction Y close to the inside of the battery pack 20, thereby making the fifth length less than the sixth length.

[0203] The shapes of the third recess 11421 and the fourth recess 12411 may be the same or different. The third recess and the fourth recess 12411 may be rectangular grooves, arc-shaped grooves, etc.

[0204] The third recess 11421 may extend along the third direction Z to the two end faces of the first sub-shell 11. The fourth recess 12411 may extend along the third direction Z to the two end faces of the second sub-shell 12. Alternatively, the third recess 11421 may not extend to the two end faces of the first sub-shell 11 along the third direction Z, and the fourth recess 12411 may not extend to the two end faces of the second sub-shell 12 along the third direction Z.

[0205] It should be noted that, since the third recess 11421 and the fourth recess 12411 contain the molten metal from the welding process, in the above embodiment, the third recess 11421 and the fourth recess 12411 are fused into the second welding area 17 after welding is completed.

[0206] Before the first sub-shell 11 and the second sub-shell 12 are welded at the positions corresponding to the fourth portion 114 and the fifth portion 124, in some embodiments, such as Figure 19 , Figure 21 , Figure 23 As shown, the first sub-shell 11 also includes a third end face 115, which faces the first portion 111 along the first direction X, and the fourth portion 114 protrudes from the third end face 115 along the first direction X.

[0207] The third end face 115 is connected to the tenth surface 1142, and the third end face 115 and the tenth surface 1142 together define the third receiving portion C3. Figure 24 As shown in the figure, at least a portion of the fifth part 124 is accommodated in the third accommodating part C3 so that when viewed along the first direction X, the fifth part 124 and the first sub-shell 11 overlap. Thus, the fifth part 124 and the first sub-shell 11 share a portion of space, which can reduce the size of the overall structure formed by the fifth part 124 and the first sub-shell 11, which is beneficial to reducing the overall size of the shell 10, thereby benefiting the reduction of the size of the battery 100 and the miniaturization of the battery 100 structure. Figure 24 The dashed box indicated by C3 represents at least a portion of the third receiving part.

[0208] Along the first direction X, the fifth part 124 has a fourth end face 1243 facing the third end face 115. Before the first sub-shell 11 and the second sub-shell 12 are welded, the third end face 115 and the fourth end face 1243 abut against each other, that is, the third end face 115 and the fourth end face 1243 are in contact. After welding, the third end face 115 and the fourth end face 1243 are fused into the second welding area 17.

[0209] In an embodiment where a third recess 11421 is provided on the tenth surface 1142 before the first sub-shell 11 and the second sub-shell 12 are welded, the third recess 11421 may extend to the third end face 115 along the first direction X. Alternatively, the third recess 11421 may not extend to the third end face 115. In an embodiment where a fourth recess 12411 is provided on the eleventh surface 1241, the fourth recess 12411 may extend to the fourth end face 1243 along the first direction X. Alternatively, the fourth recess 12411 may not extend to the fourth end face 1243.

[0210] Along the second direction Y, the fifth portion 124 is at least partially received within the third receiving portion C3 defined by the third end face 115 and the tenth surface 1142. The first sub-shell 11 also includes a second side face 116, which is parallel to the tenth surface 1142 and connected to the third end face 115. The second side face 116 is part of the outer surface of the first sub-shell 11 (or the outer surface of the shell 10). In an embodiment where a portion of the fifth portion 124 is received within the third receiving portion C3 along the second direction Y, the twelfth surface 1242 protrudes from the second side face along the second direction Y. In an embodiment where the fifth portion 124 is completely received within the receiving portion along the second direction Y, the second side face 116 may protrude from the twelfth surface 1242 along the second direction Y, or the second side face 116 and the twelfth surface 1242 may be coplanar or flush. Figure 19 , Figure 21 and Figure 23 The second side surface 116 and the twelfth surface 1242 are shown to be coplanar (which can be understood as being flush).

[0211] like Figure 17 , Figure 19 and Figure 21 As shown, in some embodiments, along the first direction X, the second sub-shell 12 includes a thirteenth surface 125 facing the fourth portion 114, a fifth portion 124 protruding from the thirteenth surface 125, and the fourth portion 114 includes a fourteenth surface 1143 facing the thirteenth surface 125. A fourth spacing D4 exists between the thirteenth surface 125 and the fourteenth surface 1143. The thirteenth surface 125 is connected to the eleventh surface 1241. The fourteenth surface 1143 is disposed facing the thirteenth surface 125 along the first direction X, and one end of the fourteenth surface 1143 along the second direction Y is connected to the tenth surface 1142. The fourth spacing D4 is the space between the thirteenth surface 125 and the fourteenth surface 1143. The fourth spacing D4 between the thirteenth surface 125 of the second sub-shell 12 and the fourteenth surface 1143 of the fourth portion 114 in the first direction X provides deformation space for the deformation of the third portion 113 and the fourth portion 114 during welding.

[0212] The fourth gap D4 can be filled with colloid E. The colloid filled in the fourth gap D4 can be an adhesive structure capable of bonding the fourth part 114 and the second sub-shell 12. Filling the fourth gap D4 with colloid allows the second sub-shell 12 and the fourth part 114 to be connected through the colloid filled in the fourth gap D4, which can increase the connection area between the first sub-shell 11 and the second sub-shell 12, thereby improving the connection stability and airtightness of the first sub-shell 11 and the second sub-shell 12.

[0213] In other embodiments, the fourth spacing D4 may not be filled with colloid E.

[0214] In some embodiments, the colloid E filling the fourth spacing D4 may be one of epoxy resin, polyurethane, silicone, or chloroprene rubber.

[0215] In some other embodiments, the thirteenth surface 125 and the fourteenth surface 1143 may also abut against each other, that is, the thirteenth surface 125 and the fourteenth surface 1143 are attached together, and there is no gap between the thirteenth surface 125 and the fourteenth surface 1143.

[0216] In some embodiments, the fourteenth surface 1143 and the tenth surface 1142 can be directly connected or indirectly connected. For example... Figure 18 , Figure 20 and Figure 22 As shown, the fourteenth surface 1143 and the tenth surface 1142 are connected by a fourth chamfered surface 1144, so that the fourteenth surface 1143 and the tenth surface 1142 are transitionally connected by the fourth chamfered surface 1144. The fourth chamfered surface 1144 can be a bevel or a circular arc surface.

[0217] like Figure 18 , Figure 20 and Figure 22 As shown, in some embodiments, the second sub-shell 12 further includes a sixth portion 126 protruding from the thirteenth surface 125 along the first direction X. Along the second direction Y, the sixth portion 126 and the fifth portion 124 are arranged at intervals relative to each other, and the fourth portion 114 is inserted between the fifth portion 124 and the sixth portion 126. The fifth portion 124 and the sixth portion 126 can respectively limit the fourth portion 114 on both sides along the second direction Y, reducing the deformation of the fourth portion 114 during the welding process. This helps improve the welding quality of the fourth portion 114 and the fifth portion 124, and further helps improve the connection stability and airtightness of the first sub-shell 11 and the second sub-shell 12.

[0218] Part 114 may be partially or entirely inserted between Part 124 and Part 126.

[0219] like Figure 18 , Figure 20 , Figure 22 , Figure 24 As shown, in some embodiments, a second receiving groove 1145 is formed on the ninth surface 1141 along the second direction Y, and the second receiving groove 1145 extends to the fourteenth surface 1143 along the first direction X, with at least a portion of the sixth portion 126 being received in the second receiving groove 1145.

[0220] The second receiving groove 1145 is recessed from the ninth surface 1141 in the second direction Y, away from the battery pack 20, and extends along the first direction X to the fourteenth surface 1143 of the fourth portion 114. The second receiving groove 1145 has slots formed on both the ninth surface 1141 and the fourteenth surface 1143. When the fourth portion 114 is inserted between the fifth portion 124 and the sixth portion 126 along the first direction X, the sixth portion 126 also simultaneously enters the second receiving groove 1145 from the slot located on the fourteenth surface 1143.

[0221] The sixth part 126 can be partially or entirely contained within the second receiving groove 1145.

[0222] In one embodiment where only a portion of the sixth part 126 is accommodated in the second receiving groove 1145, the sixth part 126 may be entirely accommodated in the second receiving groove 1145 along the first direction X, a portion of the sixth part 126 along the second direction Y may be accommodated in the second receiving groove 1145, and another portion of the sixth part 126 along the second direction Y may extend out of the second receiving groove 1145 from the opening of the ninth surface 1141 located in the second receiving groove 1145; or, a portion of the sixth part 126 along the first direction X may be accommodated in the second receiving groove 1145, and the entire sixth part 126 along the second direction Y may be accommodated in the second receiving groove 1145. In the embodiment where the entire sixth part 126 along the second direction Y is accommodated in the second receiving groove 1145, along the second direction Y, the ninth surface 1141 of the fourth part 114 may extend beyond the surface of the sixth part 126 away from the fifth part 124, or the ninth surface 1141 of the fourth part 114 may be flush with the surface of the sixth part 126 away from the fifth part 124.

[0223] The ninth surface 1141 of the fourth part 114 is formed with a second receiving groove 1145. At least part of the sixth part 126 is received in the second receiving groove 1145. The sixth part 126 and the fourth part 114 are more compact, which is conducive to reducing the overall structural size of the first sub-shell 11 and the second sub-shell 12, thereby helping to reduce the structural size of the battery 100 and miniaturize the battery 100 structure.

[0224] like Figure 18 , Figure 20 and Figure 22 As shown, in some embodiments, along the second direction Y, the second receiving groove 1145 has a third wall 11451 facing the sixth portion 126, the sixth portion 126 including a fifteenth surface 1261 disposed facing the third wall 11451, and a fifth gap D5 exists between the third wall 11451 and the fifteenth surface 1261. The fifth gap D5 may be filled with colloid E.

[0225] The third wall 11451 is a portion of the wall surface of the second receiving groove 1145. The third wall 11451 is connected to the fourteenth surface 1143. The third wall 11451 and the fourteenth surface 1143 can be directly connected. Alternatively, the third wall 11451 and the fourteenth surface 1143 can be indirectly connected, such as... Figure 18 , Figure 20 and Figure 22 As shown, the fourteenth surface 1143 and the third wall 11451 are connected by the fifth chamfered surface 1146, so that the fourteenth surface 1143 and the third wall 11451 are transitionally connected by the fifth chamfered surface 1146. The fifth chamfered surface 1146 can be a bevel or a circular arc surface.

[0226] The fifth gap D5 is the space between the third wall 11451 and the fifteenth surface 1261. The colloid E filling the fifth gap D5 can be an adhesive structure capable of bonding the sixth part 126 and the fourth part 114.

[0227] In other embodiments, the fifth spacing D5 may not be filled with colloid E.

[0228] In some embodiments, the colloid E filling the fifth spacing D5 may be one of epoxy resin, polyurethane, silicone, or chloroprene rubber.

[0229] Please continue to refer to Figure 18 , Figure 20 and Figure 22 In some embodiments, along the first direction X, the sixth portion 126 includes a sixteenth surface 1262, and the second receiving groove 1145 includes a fourth wall 11452 disposed facing the sixteenth surface 1262, with a sixth gap D6 between the sixteenth surface 1262 and the fourth wall 11452. The sixth gap D6 may be filled with colloid E.

[0230] The sixteenth surface 1262 is the surface of the sixth part 126 that is furthest from the thirteenth surface 125 along the first direction X. It can be understood that the sixteenth surface 1262 is the surface of the third part 113 that is closest to the first sub-shell 11 along the first direction X.

[0231] The sixteenth surface 1262 is connected to the fifteenth surface 1261. The fifteenth surface 1261 and the sixteenth surface 1262 can be directly connected. Alternatively, the fifteenth surface 1261 and the sixteenth surface 1262 can be indirectly connected, such as... Figure 18 , Figure 20 and Figure 22 As shown, the fifteenth surface 1261 and the sixteenth surface 1262 are connected by the sixth chamfered surface 1263, so that the fifteenth surface 1261 and the sixteenth surface 1262 are transitionally connected by the sixth chamfered surface 1263. The sixth chamfered surface 1263 can be a bevel or a curved surface. The figure shows the case where the sixth chamfered surface 1263 is a bevel. The sixth chamfered surface 1263 can guide the fourth part 114 to be inserted between the fifth part 124 and the sixth part 126, making it easier for the fourth part 114 to be inserted between the fifth part 124 and the sixth part 126.

[0232] The fourth wall 11452 is part of the wall surface of the second receiving groove 1145. The fourth wall 11452 is connected to the third wall 11451.

[0233] The sixth gap D6 is the space between the sixteenth surface 1262 and the third wall 11451 along the first direction X. The colloid E filling the sixth gap D6 can be an adhesive structure capable of bonding the sixth part 126 and the fourth part 114. In some embodiments, the colloid E filling the sixth gap D6 can be one of epoxy resin, polyurethane, silicone, and neoprene rubber.

[0234] like Figure 1 , Figure 25 As shown, in some embodiments, the first sub-shell 11 includes a first base wall 119, a first side wall 117, and a second side wall 118. The first side wall 117 and the second side wall 118 are disposed opposite to each other along the second direction Y, and the first base wall 119 connects the first side wall 117 and the second side wall 118. The second sub-shell 12 includes a second base wall 129, a third side wall 127, and a fourth side wall 128. The third side wall 127 and the fourth side wall 128 are disposed opposite to each other along the second direction Y, and the second base wall 129 connects the third side wall 127 and the fourth side wall 128. The first base wall 119 and the second base wall 129 are disposed opposite to each other along the first direction X. The first part 111 is a part of the first side wall 117, the fourth part 114 is a part of the second side wall 118, the second part 121 is a part of the third side wall 127, and the fifth part 124 is a part of the fourth side wall 128.

[0235] The first sidewall 117 and the second sidewall 118 are respectively connected to the two ends of the first base wall 119 along the second direction Y. The first sidewall 117, the second sidewall 118 and the first base wall 119 together form a U-shaped first sub-shell 11. The first sidewall 117 includes a first main body 1171 and a first part 111. Along the first direction X, one end of the first main body 1171 is connected to the first base wall 119, and the other end of the first main body 1171 is connected to the first part 111. The end face of the first main body 1171 facing away from the first base wall 119 along the first direction X is the fifth surface 112 of the first sub-shell 11. That is, the first part 111 is connected to the fifth surface 112. It can be understood that the first part 111 protrudes from the fifth surface 112 along the first direction X.

[0236] In an embodiment where the first sub-shell 11 also includes a third part 113, the first sidewall 117 also includes a third part 113, which is connected to the end face of the first body 1171 facing away from the first base wall 119 along the first direction X. That is, the third part 113 is connected to the fifth surface 112. It can be understood that the third part 113 protrudes from the fifth surface 112 along the first direction X.

[0237] The second sidewall 118 includes a second main body 1181 and a fourth part 114. Along the first direction X, one end of the second main body 1181 is connected to the first base wall 119, and the other end of the second main body 1181 is connected to the fourth part 114. The end face of the second main body 1181 facing away from the first base wall 119 along the first direction X is the third end face 115 of the first sub-shell 11. That is, the fourth part 114 is connected to the third end face 115. It can be understood that the fourth part 114 protrudes from the third end face 115 along the first direction X.

[0238] The third sidewall 127 and the fourth sidewall 128 are respectively connected to the two ends of the second base wall 129 along the second direction Y. The third sidewall 127, the fourth sidewall 128 and the second base wall 129 together form a U-shaped second sub-shell 12. The third sidewall 127 includes a third main body 1271 and a second part 121. Along the first direction X, one end of the third main body 1271 is connected to the second base wall 129, and the other end of the third main body 1271 is connected to the second part 121. The end face of the third main body 1271 facing away from the second base wall 129 along the first direction X is the first end face 122 of the first sub-shell 11. That is, the second part 121 is connected to the first end face 122. It can be understood that the second part 121 protrudes from the first end face 122 along the first direction X.

[0239] The fourth sidewall 128 includes a fourth main body 1281 and a fifth part 124. Along the first direction X, one end of the fourth main body 1281 is connected to the second base wall 129, and the other end of the fourth main body 1281 is connected to the fifth part 124. The end face of the fourth main body 1281 facing away from the second base wall 129 along the first direction X is the thirteenth surface 125 of the first sub-shell 11. That is, the fourth part 114 is connected to the thirteenth surface 125. It can be understood that the fourth part 114 protrudes from the thirteenth surface 125 along the first direction X.

[0240] In an embodiment where the second sub-shell 12 also includes a sixth portion 126, the fourth sidewall 128 also includes a sixth portion 126, which is connected to the end face of the fourth body 1281 facing away from the second base wall 129 along the first direction X. That is, the third portion 113 is connected to the thirteenth surface 125. It can be understood that the third portion 113 protrudes from the thirteenth surface 125 along the first direction X.

[0241] It should be noted that the arrangement of the first sub-shell 11 and the second sub-shell 12 along the first direction X means that the structure formed by the first main body 1171, the second main body 1181 and the first substrate wall of the first sub-shell 11 and the structure formed by the third main body 1271, the fourth main body 1281 and the second substrate wall of the second sub-shell 12 are arranged along the first direction X.

[0242] The first sub-shell 11 includes a first base wall 119, a first side wall 117, and a second side wall 118. The second sub-shell 12 includes a second base wall 129, a third side wall 127, and a fourth side wall 128. The first side wall 117 and the second side wall 118 are arranged opposite each other along the second direction Y. The third side wall 127 and the fourth side wall 128 are arranged opposite each other along the second direction Y. The first base wall 119 and the second base wall 129 are arranged opposite each other along the first direction X. The first part 111 is a part of the first side wall 117, the fourth part 114 is a part of the second side wall 118, the second part 121 is a part of the third side wall 127, and the fifth part 124 is a part of the fourth side wall 128, which facilitates the connection between the first sub-shell 11 and the second sub-shell 12.

[0243] like Figure 25 As shown, in some embodiments, the length of the first sidewall 117 is greater than the length of the third sidewall 127, and the length of the second sidewall 118 is less than the length of the fourth sidewall 128.

[0244] The length of the first sidewall 117 refers to the distance along the first direction X between the surface of the first base wall 119 facing the second base wall 129 and the surface of the first sidewall 117 furthest from the first base wall 119, i.e., the distance along the first direction X between the surface of the first base wall 119 facing the second base wall 129 and the second end face 1113, i.e., H6. The length of the third sidewall 127 refers to the distance along the first direction X between the surface of the second base wall 129 facing the first base wall 119 and the surface of the third sidewall 127 furthest from the second base wall 129, i.e., the distance between the surface of the second base wall 129 facing the first base wall 119 and the sixth surface 1213, i.e., H7, where H6 > H7.

[0245] The length of the second sidewall 118 refers to the distance along the first direction X between the surface of the first base wall 119 facing the second base wall 129 and the surface of the second sidewall 118 furthest from the first base wall 119, i.e., the distance along the first direction X between the surface of the first base wall 119 facing the second base wall 129 and the fourteenth surface 1143, i.e., H8. The length of the fourth sidewall 128 refers to the distance along the first direction X between the surface of the second base wall 129 facing the first base wall 119 and the surface of the fourth sidewall 128 furthest from the second base wall 129, i.e., the distance between the surface of the second base wall 129 facing the first base wall 119 and the fourth end face 1243, i.e., H9, where H8 < H9.

[0246] The length of the first sidewall 117 is greater than that of the third sidewall 127. The second portion 121 of the third sidewall 127 is closer to the battery pack 20 than the first portion 111 of the first sidewall 117. Therefore, the third sidewall 127 can effectively limit the deformation of the first sidewall 117 (or the first portion 111) towards the battery pack 20 during the welding process, thereby improving the welding quality of the first portion 111 and the second portion 121, and thus improving the connection stability of the first sub-shell 11 and the second sub-shell 12. The length of the second sidewall 118 is less than that of the fourth sidewall 128. The fourth portion 114 of the second sidewall 118 is closer to the battery pack 20 than the first portion 111 of the first sidewall 117. Therefore, the second sidewall 118 can effectively limit the deformation of the fourth sidewall 128 (or the fifth portion 124) towards the battery pack 20 during the welding process, thereby improving the welding quality of the fourth portion 114 and the fifth portion 124, and thus improving the connection stability of the first sub-shell 11 and the second sub-shell 12.

[0247] In other embodiments, the length of the first sidewall 117 may be less than or equal to the length of the third sidewall 127, i.e., H6≤H7.

[0248] In other embodiments, the length of the second sidewall 118 is greater than or equal to the length of the fourth sidewall 128, and H8 ≥ H9.

[0249] In some embodiments, the first sub-shell 11 and the second sub-shell 12 have the same structure.

[0250] The first sub-shell 11 and the second sub-shell 12 have the same structure, including the first sidewall 117 and the fourth sidewall 128, which have the same structure, and the second sidewall 118 and the third sidewall 127, which have the same structure. Before welding and after forming the first joint surface 13 and the second joint surface 16, when viewed along the third direction Z, the midpoint of the line connecting the midpoint of the first joint surface 13 along the first direction X and the midpoint of the second joint surface 16 along the first direction X is the center symmetry point. The first joint surface 13 and the second joint surface 16 are symmetrical about this center symmetry point.

[0251] Of course, the first sub-shell 11 and the second sub-shell 12 may also include the first base wall 119 and the second base wall 129 having the same structure.

[0252] The first sub-shell 11 and the second sub-shell 12 have the same structure, which makes the assembly of the first sub-shell 11 and the second sub-shell 12 more convenient.

[0253] like Figure 1 As shown, in some embodiments, the first sub-shell 11 and the second sub-shell 12 together define a cavity having a first opening 18 and a second opening 19, the first opening 18 and the second opening 19 being disposed opposite each other along a third direction Z; the battery 100 also includes a first cover 30 and a second cover 40, the first cover 30 and the second cover 40 respectively closing the first opening 18 and the second opening 19.

[0254] The first opening 18 is a rectangular opening defined by the U-shaped first sub-shell 11 and the U-shaped second sub-shell 12, and the second opening 19 is also a rectangular opening defined by the U-shaped first sub-shell 11 and the U-shaped second sub-shell 12. Of course, depending on the different shapes of the first sub-shell 11 and the second sub-shell 12, the shapes of the first opening 18 and the second opening 19 will also be different. For example, if the first sub-shell 11 and the second sub-shell 12 are both the same semi-circular structure, then the first opening 18 and the second opening 19 can both be circular openings.

[0255] The first cover 30 closes the first opening 18. The first cover 30 and the shell 10 can be connected by welding, screws, snap-fit, or other methods to achieve the closing of the first opening 18. The second cover 40 closes the second opening 19. The second cover 40 and the shell 10 can be connected by welding, screws, snap-fit, or other methods to achieve the closing of the second opening 19. The structures of the first cover 30 and the second cover 40 can be the same or different.

[0256] The first sub-shell 11, the second sub-shell 12, the first end cap, and the second end cap together define a closed space for accommodating the battery pack 20 and other structures of the battery 100. The first sub-shell 11 and the second sub-shell 12 together define a cavity with a first opening 18 and a second opening 19, facilitating the installation of the battery pack 20 and other structures inside the shell 10. The first cover 30 and the second cover 40 respectively close the first opening 18 and the second opening 19, which helps improve the airtightness of the battery 100 and provides better protection for the internal structures of the battery 100.

[0257] In some embodiments, the first welding region 14 extends along a third direction Z, and the two ends of the first welding region 14 along the third direction Z do not extend beyond the two end faces of the housing 10.

[0258] One end face of the first sidewall 117 along the third direction Z of the first sub-shell 11, one end face of the second sidewall 118 along the third direction Z of the first sub-shell 11, and one end face of the first base wall 119 along the third direction Z of the first sub-shell 11 together define one end face of the shell 10 along the third direction Z of the first sub-shell 11. The other end face of the first sidewall 117 along the third direction Z of the first sub-shell 11, the other end face of the second sidewall 118 along the third direction Z of the first sub-shell 11, and the other end face of the first base wall 119 along the third direction Z of the first sub-shell 11 together define the other end face of the shell 10 along the third direction Z of the first sub-shell 11.

[0259] The first end cap and the second end cap can respectively mate with the two end faces of the housing 10 along the third direction Z to seal the first opening 18 and the second opening 19.

[0260] The first welding area 14 does not extend beyond the housing 10 at either end along the third direction Z, which can reduce the risk of the first welding area 14 interfering with the sealing of the first cover 30 and the second cover 40 to the sealing of the first opening 18 and the second opening 19, so that the first cover 30 can better seal the first opening 18 and the second cover 40 can better seal the second opening 19, thereby improving the airtightness of the battery 100.

[0261] In the embodiment where the first sub-shell 11 and the second sub-shell 12 are welded to form the second welding area 17, the second welding area 17 extends along the third direction Z. The two ends of the second welding area 17 along the third direction Z may not extend beyond the two end faces of the shell 10. This can reduce the risk of the second welding area 17 interfering with the sealing of the first cover 30 and the second cover 40 of the first opening 18 and the second opening 19, so that the first cover 30 can better seal the first opening 18 and the second cover 40 can better seal the second opening 19, thereby improving the airtightness of the battery 100.

[0262] like Figure 26 , Figure 27As shown, in some embodiments, the first welding area 14 extends along the third direction Z, and the two ends of the first welding area 14 along the third direction Z extend beyond the two end faces of the housing 10; the first cover 30 is provided with a first clearance portion 31 opposite to the first welding area 14 on the side facing the first opening 18, and the second cover 40 is provided with a second clearance portion (not shown in the figure) opposite to the first welding area 14 on the side facing the second opening 19. The first clearance portion 31 and the second clearance portion are used to clear the portion of the first welding area 14 that extends beyond the end face of the housing 10 along the third direction Z.

[0263] The first clearance portion 31 has a space for the end of the first welding area 14 extending beyond the end face of the housing 10 in the direction of the first end cover to be inserted. Viewed along the third direction Z, the projection of the first welding area 14 is located within the first clearance portion 31. The first clearance portion 31 can have various structural forms; for example, it can be provided as a hole or notch on the surface of the first cover 30 facing the housing 10 along the third direction Z. Figure 27 The diagram shows a first clearance portion 31 formed on the surface of the first cover 30 facing the housing 10 in the third direction Z, and extending in the second direction Y to the surface of the first cover 30 facing the battery pack 20.

[0264] The second clearance portion has a space for the end of the first welding area 14 that extends beyond the end face of the housing 10 in the direction of the second end cover to be inserted. When viewed along the third direction Z, the projection of the second welding area is located within the second clearance portion. The second clearance portion can have various structural forms, such as a hole or notch on the surface of the second end cover facing the housing 10 along the third direction Z.

[0265] The first avoidance part 31 and the second avoidance part may have the same or different structural forms.

[0266] The first cover 30 is provided with a first clearance portion 31 facing the first opening 18 to avoid the portion of the first welding area 14 that extends beyond the end face, and the second cover 40 is provided with a second clearance portion facing the second opening 19 to avoid the portion of the first welding area 14 that extends beyond the end face. This avoids the first welding area 14 interfering with the sealing of the first cover 30 and the second cover 40 of the first opening 18 and the second opening 19, so that the first cover 30 can better seal the first opening 18 and the second cover 40 can better seal the second opening 19, thereby improving the airtightness of the battery 100.

[0267] In an embodiment where the first sub-shell 11 and the second sub-shell 12 are welded to form the second welding region 17, the second welding region 17 extends along a third direction Z, and the two ends of the second welding region 17 along the third direction Z can extend beyond the two end faces of the shell 10; the first cover 30 is provided with a third clearance portion (not shown in the figure) opposite to the second welding region 17 on the side facing the first opening 18, and the second cover 40 is provided with a fourth clearance portion (not shown in the figure) opposite to the second welding region 17 on the side facing the second opening 19. The third clearance portion and the fourth clearance portion are used to avoid the portion of the second welding region 17 that extends beyond the end face of the shell 10 along the third direction Z.

[0268] The third clearance portion forms a space for the end of the second welding area 17 that extends beyond the end face of the housing 10 in the direction of the first end cap to be inserted. When viewed along the third direction Z, the projection of the second welding area 17 is located within the third clearance portion. The third clearance portion can have various structural forms, such as a hole or notch on the surface of the first end cap facing the housing 10 along the third direction Z.

[0269] The fourth clearance portion has a space for the end of the second welding area 17 that extends beyond the end face of the housing 10 in the direction of the second end cap to be inserted. When viewed along the third direction Z, the projection of the second welding area 17 is located within the fourth clearance portion. The fourth clearance portion can have various structural forms; for example, it can be provided as a hole or notch on the surface of the second end cap facing the housing 10 along the third direction Z.

[0270] The third and fourth avoidance sections can have the same or different structural forms.

[0271] In an embodiment where the first sub-housing 11 includes a fourth portion 114 and the second sub-housing 12 includes a fifth portion 124, the fourth portion 114 may also be disposed on the side of the fifth portion 124 away from the battery pack 20 along the second direction Y. The ninth surface 1141 of the fourth portion 114 and the twelfth surface 1242 of the fifth portion 124 are joined to form a third joint surface. The first sub-housing 11 and the second sub-housing 12 are joined by welding to form a second welding region 17. Viewed along the third direction Z, the second welding region 17 has a third region 171 that is further away from the battery pack 20 in the second direction Y than the third joint surface, and a fourth region 172 that is closer to the battery pack 20 in the second direction Y than the second joint surface 16. The average length of the third region 171 in the second direction Y is a fifth length, and the distance between the ninth surface 1141 and the tenth surface 1142 in the second direction Y is a seventh length. The fifth length is less than the seventh length.

[0272] This application also provides an electrical device, which includes the battery 100 provided in any of the above embodiments. The battery 100 provides electrical energy for the electrical device to perform its functions.

[0273] This application embodiment also provides a method for manufacturing a battery 100, the method for manufacturing a battery 100 includes:

[0274] A battery pack 20 comprising multiple cells 21 is provided;

[0275] A first sub-shell 11 and a second sub-shell 12 are provided. The first sub-shell 11 has a first surface 1111 for engaging with the second sub-shell 12, and the second sub-shell 12 has a fourth surface 1212 for engaging with the first sub-shell 11.

[0276] A receiving space 15 is formed on the first surface 1111 and / or the fourth surface 1212;

[0277] The first surface 1111 and the fourth surface 1212 are joined to form a joint surface so that the battery pack 20 is accommodated in the space defined by the first sub-casing 11 and the second sub-casing 12.

[0278] The first sub-shell 11 and the second sub-shell 12 are welded at the corresponding positions in the accommodating space 15.

[0279] Specifically, the first sub-shell 11 and the second sub-shell 12 are joined from both sides of the battery pack 20 along the first direction X, such that the first surface 1111 and the fourth surface 1212 are bonded to form a first joint surface 13. In embodiments where both the first surface 1111 and the fourth surface 1212 have receiving spaces 15, when viewed along a direction perpendicular to the first surface 1111, the receiving spaces 15 of the first surface 1111 and the receiving spaces 15 of the fourth surface 1212 at least partially overlap. Welding the first sub-shell 11 and the second sub-shell 12 at corresponding positions of the receiving spaces 15 means that, when viewed along a direction perpendicular to the first surface 1111, at least a portion of the receiving space 15 overlaps with the welding area.

[0280] A receiving space 15 is formed on the first surface 1111 and / or the fourth surface 1212, and the first sub-shell 11 and the second sub-shell 12 are welded at corresponding positions in the receiving space 15. During the welding process, the molten portions of the first sub-shell 11 and the second sub-shell 12 enter the receiving space 15. Therefore, the height of the welded area protruding from the outer surface of the shell 10 is relatively small. In some embodiments, the welded area may not protrude from the outer surface of the shell 10, resulting in a smoother appearance of the shell 10 at the welding position, thereby improving the appearance quality of the shell 10. Since the degree to which the welded area protrudes from the outer surface of the shell 10 is very small, in some embodiments, the welded area may also not protrude from the outer surface of the shell 10. This facilitates the assembly of the battery 100 with other structures, reduces the risk of interference between the welded area and other structures, and reduces the risk of damage to other structures due to the welded area protruding from the outer surface of the shell 10. Furthermore, the fact that the welded area protrudes from the surface of the shell 10 very little or not at all makes the appearance of the shell 10 at the welding position smoother, thereby improving the appearance quality of the shell 10.

[0281] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: case; A battery pack comprising multiple cells is housed within the casing; The housing includes a first sub-housing and a second sub-housing arranged along a first direction. The first sub-housing includes a first portion, and the second sub-housing includes a first end face and a second portion. The first end face faces the first portion along the first direction, and the second portion protrudes from the first end face along the first direction. The first portion includes a first surface and a second surface arranged along a second direction, wherein the first surface is closer to the battery pack than the second surface along the second direction. The second portion includes a third surface and a fourth surface arranged along the second direction, wherein the third surface is closer to the battery pack than the fourth surface along the second direction. The first portion and the second portion are stacked, wherein the second portion is closer to the battery pack than the first portion. The first end face is connected to the fourth surface, and the first end face and the fourth surface together define a first receiving portion. At least a portion of the first portion is received within the first receiving portion. The outer surface of the second sub-shell includes a first side surface, wherein the first side surface is further away from the battery pack than the fourth surface along the second direction. The first side surface and the second surface are coplanar. The first surface and the fourth surface form a first joint surface. The first sub-shell and the second sub-shell are joined by welding to form a first welded area. The first portion and the second portion are joined by welding to form at least a portion of the first welded area. Viewed along a third direction, the first welded area has a first region that is farther away from the battery pack than the first joint surface in the second direction, and a second region that is closer to the battery pack than the first joint surface in the second direction. The average length of the first region in the second direction is a first length. The distance between the first surface and the second surface in the second direction is a second length. The first length is less than the second length. The first direction, the second direction, and the third direction are perpendicular to each other.

2. The battery according to claim 1, characterized in that, The distance between the third surface and the fourth surface along the second direction is a third length, and the second length is less than the third length.

3. The battery according to claim 2, characterized in that, The ratio of the second length to the third length is less than or equal to 1 / 2.

4. The battery according to claim 1, characterized in that, The average length of the second region in the second direction is a fourth length, which is greater than or less than the first length.

5. The battery according to claim 1, characterized in that, The distance between the third surface and the fourth surface along the second direction is the third length, the average length of the second region along the second direction is the fourth length, and the ratio of the fourth length to the third length is less than or equal to 2 / 3.

6. The battery according to claim 1, characterized in that, The first welding area extends along the third direction.

7. The battery according to claim 1, characterized in that, Viewed along the first direction, the first part and the second sub-shell overlap.

8. The battery according to claim 1, characterized in that, Along the first direction, the first sub-shell includes a fifth surface facing the second portion, the first portion protruding from the fifth surface, the second portion including a sixth surface facing the fifth surface, a first gap existing between the fifth surface and the sixth surface, the first gap being filled with a colloid.

9. The battery according to claim 8, characterized in that, The first sub-shell also includes a third portion protruding from the fifth surface along the first direction, and the third portion and the first portion are arranged at a distance from each other along the second direction, with the second portion inserted between the first portion and the third portion.

10. The battery according to claim 9, characterized in that, Along the second direction, the third surface has a first receiving groove formed therein, and along the first direction, the first receiving groove extends to the sixth surface, and at least a portion of the third portion is received within the first receiving groove.

11. The battery according to claim 10, characterized in that, Along the second direction, the first receiving groove has a first wall facing the third portion, the third portion including a seventh surface facing the first wall, a second gap existing between the first wall and the seventh surface, the second gap being filled with colloid.

12. The battery according to claim 10, characterized in that, Along the first direction, the third portion includes an eighth surface, the first receiving groove includes a second wall facing the eighth surface, a third gap exists between the eighth surface and the second wall, and the third gap is filled with colloid.

13. The battery according to claim 12, characterized in that, Along the first direction, the dimension of the third part is L1, and the distance between the fifth surface and the second wall is L2, where L1 < L2.

14. The battery according to claim 13, characterized in that, 2mm≤L1≤4mm; and / or, along the second direction, the dimension of the third portion is L3, 1.5mm≤L3≤3mm.

15. The battery according to claim 1, characterized in that, The first sub-shell further includes a fourth portion, and the second sub-shell further includes a fifth portion. The fourth portion includes a ninth surface and a tenth surface arranged along the second direction, wherein the ninth surface is closer to the battery pack than the tenth surface along the second direction. The fifth portion includes an eleventh surface and a twelfth surface arranged along the second direction, wherein the eleventh surface is closer to the battery pack than the twelfth surface along the second direction. The fourth portion is closer to the battery pack than the fifth portion. The tenth surface and the eleventh surface form a second mating surface. The first sub-shell and the second sub-shell are joined by welding to form a second welding area. Viewed along a third direction, the second welding area has a third region that is further away from the battery pack than the second mating surface in the second direction, and a fourth region that is closer to the battery pack than the second mating surface in the second direction. The average length of the third region in the second direction is a fifth length. The distance between the ninth surface and the tenth surface in the second direction is a sixth length. The fifth length is less than the sixth length.

16. The battery according to claim 15, characterized in that, The first sub-shell includes a first base wall, a first side wall, and a second side wall. The first side wall and the second side wall are disposed opposite to each other along the second direction, and the first base wall connects the first side wall and the second side wall. The second sub-shell includes a second base wall, a third side wall, and a fourth side wall, the third side wall and the fourth side wall being disposed opposite each other along the second direction, and the second base wall connecting the third side wall and the fourth side wall; The first base wall and the second base wall are disposed opposite to each other along the first direction. The first part is a part of the first side wall, the fourth part is a part of the second side wall, the second part is a part of the third side wall, and the fifth part is a part of the fourth side wall.

17. The battery according to claim 16, characterized in that, Along the first direction, the length of the first sidewall is greater than the length of the third sidewall, and the length of the second sidewall is less than the length of the fourth sidewall.

18. The battery according to claim 15, characterized in that, The first sub-shell and the second sub-shell have the same structure.

19. The battery according to claim 1, characterized in that, The first sub-shell and the second sub-shell together define a cavity having a first opening and a second opening, the first opening and the second opening being disposed opposite to each other along the third direction; The battery also includes a first cover and a second cover, the first cover and the second cover respectively closing the first opening and the second opening.

20. The battery according to claim 19, characterized in that, The first welding area extends along the third direction, and the two ends of the first welding area along the third direction do not extend beyond the two end faces of the housing.

21. The battery according to claim 19, characterized in that, The first welding area extends along the third direction, and the two ends of the first welding area along the third direction extend beyond the two end faces of the housing; The first cover has a first clearance portion on the side facing the first opening, which is opposite to the first welding area. The second cover has a second clearance portion on the side facing the second opening, which is opposite to the first welding area. The first clearance portion and the second clearance portion are used to avoid the portion of the first welding area that extends beyond the end face.

22. An electrical appliance, characterized in that, Includes the battery according to any one of claims 1-21.

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