Housing assembly and battery

Abstract

A housing assembly and a battery, the housing assembly comprising a housing (10), the housing (10) having an open end (101); a cover plate (20) is connected to the housing (10) and seals the open end (101); the cover plate (20) is provided with a plurality of pits (201) and / or a plurality of ribs (202) protruding out of the cover plate (20). The housing assembly can effectively prevent deformation of the cover plate (20), thus improving the flatness of the cover plate (20), and further facilitating assembly of the cover plate (20) and the housing (10), and improving the efficiency and precision of assembly of the cover plate (20) and the housing (10).

Description

Shell assembly and battery

[0001] Priority information: This application claims priority to Chinese patent application No. 202420168637.0 filed on January 24, 2024, priority to Chinese patent application No. 202422364135.8 filed on September 27, 2024, priority to Chinese patent application No. 202422450141.5 filed on October 11, 2024, and priority to Chinese patent application No. 202422556916.7 filed on October 22, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present invention relates to the technical field of batteries, and in particular to a housing assembly and a battery. Background Art

[0003] With the rapid development of the new energy industry, lithium batteries are gaining widespread adoption and application due to their environmental friendliness, high energy density, and long cycle life. Existing lithium batteries typically consist of a housing and a cover plate, which is attached to the housing. Because the cover plate is typically thin, it easily deforms and becomes uneven, hindering assembly of the cover and housing, reducing assembly efficiency and precision. Furthermore, a cover that is too thin can compromise the overall strength of the battery, making it unsuitable for a wider range of applications. Therefore, optimization of the battery housing and cover plate is necessary. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to reduce the deformation of the cover plate and improve the flatness of the cover plate, so as to facilitate the assembly of the cover plate and the housing.

[0005] In order to solve the above technical problems, the present invention provides a housing assembly, comprising:

[0006] a housing having an open end;

[0007] A cover plate is connected to the shell and covers the open end, and the cover plate is provided with a plurality of pits and / or a plurality of ribs protruding from the cover plate.

[0008] In one embodiment of the present invention, the plurality of recesses on the cover plate are arranged in an array.

[0009] In one embodiment of the present invention, the cross section of the pit is rectangular, V-shaped or trapezoidal.

[0010] In one embodiment of the present invention, at least two of the ribs are cross-arranged.

[0011] In one embodiment of the present invention, the plurality of ribs include two cross-arranged ribs, and the intersection of the two cross-ribs is located in the middle of the cover plate to form a middle intersection.

[0012] In one embodiment of the present invention, the plurality of ribs further include annular ribs, each of the annular ribs surrounds the periphery of the middle intersection, and the two cross ribs forming the middle intersection both pass through the annular ribs.

[0013] In one embodiment of the present invention, the plurality of ribs include a plurality of annular ribs, and the centers of the plurality of annular ribs coincide with each other.

[0014] In one embodiment of the present invention, the plurality of ribs include multiple rows of transversely arranged linear ribs and multiple columns of longitudinally arranged linear ribs, and each row of transversely arranged linear ribs intersects with all longitudinally arranged linear ribs.

[0015] In one embodiment of the present invention, the shell includes two oppositely arranged first side panels, both ends of the two first side panels are connected to a second side panel, and corners are formed at the connection between the first side panel and the second side panel.

[0016] In one embodiment of the present invention, the first side plate includes a first plate portion, a second plate portion, and a connecting portion connected between the first plate portion and the second plate portion, and the first plate portion protrudes from the second plate portion.

[0017] In one embodiment of the present invention, the protrusion distance of the first plate portion relative to the second plate portion is 0.05-1.0 mm, and the spacing distance between the first plate portion and the second plate portion along their extension directions is 0.05-5.0 mm.

[0018] In one embodiment of the present invention, the outer surface of the connecting portion includes one or a combination of a curved surface, a flat surface, and an inclined surface.

[0019] In one embodiment of the present invention, the connecting portion is plate-shaped, and the angle between the connecting portion and the first plate portion is 90° to 180°.

[0020] In one embodiment of the present invention, the connecting portion includes a first arc portion connected to the second plate portion and a second arc portion connected between the first arc portion and the first plate portion, the centers of curvature of the first arc portion and the second arc portion are located on both sides of the connecting portion, and the first arc portion and the second plate portion and the second arc portion and the first plate portion have a smooth transition.

[0021] In one embodiment of the present invention, the first plate portion and the second plate portion are arranged in parallel and spaced apart; and the two first side plates are arranged symmetrically with respect to the center.

[0022] In one embodiment of the present invention, the open end of the shell is provided with a flange extending outward, and the cover plate is connected to the flange.

[0023] In one embodiment of the present invention, a positive electrode member and a negative electrode member are connected to one of the second side plates, the shell is a conductive member, and the positive electrode member is connected to the shell via an insulating component.

[0024] In one embodiment of the present invention, the insulating assembly includes an outer insulating member and an inner insulating member, the positive electrode member passes through the second side plate, one end of the positive electrode member is insulated from the shell by the outer insulating member, and the other end of the positive electrode member extends into the interior of the shell and is connected to the conductive sheet, and the conductive sheet and the shell are insulated by the inner insulating member.

[0025] In one embodiment of the present invention, the insulating assembly includes an insulating film, and the positive electrode is connected to the shell by thermal melting through the insulating film.

[0026] In one embodiment of the present invention, corner ribs are formed at the corners, the corner ribs protrude from the outer wall of the shell, and the interior of the corner ribs has a first recessed portion, which is recessed outward from the inner wall of the shell.

[0027] In one embodiment of the present invention, the maximum distance that the corner rib protrudes from the outer wall of the shell is less than 0.1 mm.

[0028] In one embodiment of the present invention, at least two corner ribs are provided at each corner along the height direction.

[0029] In one embodiment of the present invention, a transverse rib is provided on the two first side panels and / or one second side panel, the transverse rib protrudes from the outer wall of the shell, and a second recess is provided inside the transverse rib, and the second recess is recessed outward from the inner wall of the shell.

[0030] In one embodiment of the present invention, longitudinal ribs are provided on the two first side panels and / or one second side panel, the longitudinal ribs protrude from the outer wall of the shell, and the interior of the longitudinal ribs has a third recessed portion, and the third recessed portion is recessed outward from the inner wall of the shell.

[0031] In one embodiment of the present invention, the cover plate and the shell are welded together via a weld mark portion having a gap, the gap being sealed by a sealing colloid, and the sealing colloid being configured to rupture to form a pressure relief port when the internal pressure of the shell reaches a first pressure.

[0032] In one embodiment of the present invention, the shell is rectangular, the welding mark portion is in the shape of a rectangular frame and has the notch.

[0033] In one embodiment of the present invention, the welding mark portion has at least two gaps, and each of the gaps is closed by the sealing glue.

[0034] In one embodiment of the present invention, at least two of the notches in each of the welding marks have different orientations.

[0035] In one embodiment of the present invention, the shell has an open end, or the shell is provided with open ends at both ends, and each open end is closed by a corresponding cover plate.

[0036] In one embodiment of the present invention, a liquid injection hole is further provided on the shell, and the liquid blocking plug is connected to the shell and blocks the liquid injection hole.

[0037] The present invention also discloses a battery, comprising any of the above-mentioned explosion-proof housing components, wherein a battery cell is arranged inside the housing.

[0038] The above technical solution of the present invention has the following advantages over the prior art:

[0039] The housing assembly and battery of the present invention can effectively prevent deformation of the cover plate, thereby improving the flatness of the cover plate, facilitating assembly of the cover plate and the housing, and improving the assembly efficiency and accuracy of the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0041] FIG1 is a schematic structural diagram of a first embodiment of a battery of the present invention;

[0042] FIG2 is a top view of the structure shown in FIG1 ;

[0043] FIG3 is a cross-sectional view of the structure shown in FIG2 at AA;

[0044] FIG4 is a partial enlarged view of point M in FIG3 ;

[0045] FIG5 is a schematic diagram of a form of a pit at position M in FIG3 ;

[0046] FIG6 is a schematic diagram of another form of the pit at M in FIG3 ;

[0047] FIG7 is an exploded view of the structure shown in FIG1 ;

[0048] FIG8 is a schematic diagram of the structure in FIG7 from another angle;

[0049] FIG9 is a schematic structural diagram of a second embodiment of a battery of the present invention;

[0050] FIG10 is a top view of the structure shown in FIG9;

[0051] FIG11 is a cross-sectional view of the structure shown in FIG10 at BB;

[0052] FIG12 is an exploded view of the structure shown in FIG9;

[0053] FIG13 is a schematic diagram of the structure in FIG12 from another angle;

[0054] FIG14 is a schematic structural diagram of a third embodiment of a battery of the present invention;

[0055] FIG15 is an exploded view of the structure shown in FIG14;

[0056] FIG16 is a schematic diagram of the structure in FIG15 from another angle;

[0057] FIG17 is a schematic structural diagram of a fourth embodiment of a battery of the present invention;

[0058] FIG18 is a top view of the structure shown in FIG17;

[0059] FIG19 is an exploded view of the structure shown in FIG17 ;

[0060] FIG20 is a schematic diagram of the structure in FIG19 from another angle;

[0061] FIG21 is a schematic structural diagram of a fifth embodiment of a battery of the present invention;

[0062] FIG22 is a cross-sectional view of the housing of the battery shown in FIG21;

[0063] FIG23 is a schematic diagram of a connection portion connected to a first plate portion and a second plate portion according to an embodiment of the present invention;

[0064] FIG24 is another partial enlarged view of point C in FIG22;

[0065] FIG25 is a partial enlarged view of point D in FIG22;

[0066] FIG26 is another cross-sectional view of the housing of the present invention;

[0067] FIG27 is an exploded view of the housing of the embodiment shown in FIG21 of the present invention;

[0068] FIG28 is an exploded view of another housing of the present invention;

[0069] FIG29 is an exploded view of another housing with a flange edge according to the present invention;

[0070] FIG30 is an exploded view of the assembly of the positive electrode member and the insulating component of the present invention;

[0071] FIG31 is an exploded view of the battery shown in FIG21 according to the present invention;

[0072] FIG32 is a cross-sectional view of the battery shown in FIG21.

[0073] FIG33 is a schematic structural diagram of a sixth embodiment of a battery according to the present invention;

[0074] FIG34 is a front view of the structure shown in FIG33;

[0075] FIG35 is a top view of the structure shown in FIG34;

[0076] FIG36 is a structural diagram of a first embodiment of the housing of the present invention;

[0077] FIG37 is a structural diagram of a second embodiment of the housing of the present invention;

[0078] FIG38 is a schematic structural diagram of a seventh embodiment of a battery according to the present invention;

[0079] FIG39 is a front view of the structure shown in FIG38;

[0080] FIG40 is a top view of the structure shown in FIG39;

[0081] FIG41 is an exploded view of the structure shown in FIG38;

[0082] FIG42 is a schematic diagram of the housing in FIG41 at one angle;

[0083] FIG43 is a schematic diagram of the housing in FIG41 from another angle;

[0084] FIG44 is a schematic structural diagram of an eighth embodiment of a battery according to the present invention;

[0085] FIG45 is a front view of the structure shown in FIG44;

[0086] FIG46 is a top view of the structure shown in FIG45;

[0087] FIG47 is a schematic structural diagram of a ninth embodiment of a battery according to the present invention;

[0088] FIG48 is a top view of the battery structure shown in FIG47;

[0089] FIG49 is a right side view of the battery structure shown in FIG48;

[0090] FIG50 is a cross-sectional view of a point EE in FIG48;

[0091] FIG51 is a partial enlarged view of point P in FIG50;

[0092] FIG52 is a partial enlarged view of point Q in FIG51;

[0093] FIG53 is an exploded view of the battery structure shown in FIG47;

[0094] Explanation of the reference numerals in the specification: 10, housing; 101, open end; 102, accommodating cavity; 103, first side plate; 1031, first plate portion; 1032, second plate portion; 1033, connecting portion; 10331, first arc portion; 10332, second arc portion; 104, second side plate; 105, flange; 106, mounting hole; 107, liquid injection hole; 108, corner; 109, corner rib; 1091, first recessed portion; 1092, arc-shaped transition portion; 110, transverse rib; 1101, second recessed portion; 111, longitudinal rib; 1111, third recessed portion; 20, cover plate; 201, pit; 202, rib; 203, middle intersection; 204, explosion-proof groove; 30. Positive electrode; 301. Positive electrode column; 302. First sheet; 303. Second sheet; 40. Insulating sheet; 50. Negative electrode; 60. Liquid plug; 70. Battery cell; 80. Gasket; 90. External insulating member; 100. Internal insulating member; 200. Conductive sheet; 300. Weld mark; 3001. Notch; 400. Sealant. DETAILED DESCRIPTION

[0095] The present invention will be further described below with reference to the accompanying drawings and specific examples to enable those skilled in the art to better understand and implement the present invention. However, the examples set forth herein are not intended to limit the present invention. It is apparent that the described examples are merely some examples of the present disclosure, and not all examples. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present disclosure, its application, or use.

[0096] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by terms such as "vertical", "upper", "lower", "top", "side", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0097] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0098] Example 1

[0099] 1 to 8 , this embodiment discloses a housing assembly, including a housing 10 and a cover 20 ;

[0100] The housing 10 has an open end 101 , so that the battery cell 70 can be placed in the housing 10 through the opening of the open end 101 ;

[0101] The cover plate 20 is connected to the housing 10 and covers the open end 101 so that the entire housing 10 is in a closed state. A plurality of recesses 201 are provided on the cover plate 20 .

[0102] By providing a plurality of pits 201 on the cover plate 20, the deformation of the cover plate 20 can be effectively offset, thereby improving the flatness of the cover plate 20 and avoiding deformation such as warping and overall arching. It is also beneficial to improve the structural stability and overall performance of the cover plate 20, thereby being more conducive to the assembly of the cover plate 20 and the shell 10, improving the assembly convenience and assembly accuracy, and greatly improving the assembly efficiency.

[0103] In addition, the above method will not increase the weight of the cover plate 20, and is more conducive to meeting the demand for lightweight batteries.

[0104] The cover plate 20 may be made of metal or alloy material, and the alloy material is preferably stainless steel, and more preferably stainless steel 316L.

[0105] Furthermore, as shown in FIG. 2 , the plurality of pits 201 on the cover plate 20 are arranged in an array. Preferably, the plurality of pits 201 are evenly distributed to better eliminate the internal stress of the cover plate 20 and offset deformation.

[0106] In some embodiments, as shown in FIG. 4 , the cross-section of the pit 201 is trapezoidal, and the trapezoidal shape may be an inverted trapezoidal structure to better offset the deformation of the cover plate 20 .

[0107] As shown in FIG. 5 , the cross section of the pit 201 may also be rectangular, or as shown in FIG. 6 , the cross section of the pit 201 may also be rectangular V-shaped.

[0108] In some embodiments, as shown in FIG1 , a positive electrode member 30 and a negative electrode member 50 are connected to the shell 10. The shell 10 is a conductive member. In this case, the shell 10 and the negative electrode member 50 jointly act as a negative electrode. The negative electrode member 50 can be welded to the shell 10. The insulating component adopts an insulating sheet made of hot-melt material. The positive electrode member 30 can be hot-melt connected to the shell 10 through the insulating sheet 40 to simplify the battery assembly process. It can also effectively avoid the gap between the positive electrode member 30, the insulating sheet 40 and the shell 10, thereby effectively improving the sealing of the battery.

[0109] The positive electrode 30 and the housing 10 are insulated and isolated by an insulating sheet 40. The insulating sheet 40 can be made of polypropylene (PP plastic).

[0110] The negative electrode 50 may be made of nickel, the positive electrode 30 may be made of aluminum, and the housing 10 may be made of stainless steel.

[0111] In some embodiments, the housing 10 is further provided with a liquid injection hole to facilitate injection of electrolyte into the housing 10 , and the liquid blocking plug 60 is connected to the housing 10 and blocks the liquid injection hole. Further, the liquid blocking plug 60 can be connected to the housing 10 via a gasket 80 .

[0112] The liquid blocking plug 60 can be directly welded to the housing 10 .

[0113] In some embodiments, the housing 10 may have only one open end 101 ; or, both ends of the housing 10 may be provided with open ends 101 , and each open end is closed by a corresponding cover plate 20 .

[0114] The shell can be formed in one piece or in separate pieces.

[0115] This embodiment also discloses a battery, as shown in Figures 7 and 8 , which includes a battery cell 70 and a housing assembly as described in any of the above embodiments. The battery cell 70 is located in a receiving cavity 102 within the housing 10. The positive electrode of the battery cell 70 is electrically connected to the positive electrode member 30, and the negative electrode of the battery cell 70 is electrically connected to the negative electrode member 50.

[0116] Example 2

[0117] 9 to 16 , the main difference between this embodiment and the first embodiment is that a plurality of ribs 202 protruding from the cover plate 20 are provided on the cover plate 20 to enhance the strength of the cover plate 20 and prevent the cover plate from being deformed.

[0118] As shown in FIG. 13 and FIG. 16 , the ribs 202 are formed by protruding outward from the inner wall of the cover plate 20 , so that the thickness of the cover plate 20 is substantially maintained at the original thickness, without significantly increasing the weight of the cover plate 20 .

[0119] In some embodiments, at least two ribs 202 are cross-arranged to better ensure the strength of the cover plate 20 .

[0120] Preferably, as shown in FIG9 and FIG14 , the housing assembly has two cross-arranged ribs 202 , and the intersection of the two cross-ribs 202 is located in the middle of the cover plate 20 to form a middle intersection 203 , which can better avoid local deformation of the cover plate 20 .

[0121] As shown in FIG9 to FIG13 , the two cross ribs 202 forming the middle intersection 203 are both straight ribs 202 and cross in a “cross” shape;

[0122] Alternatively, as shown in FIG. 14 to FIG. 16 , the two cross ribs 202 forming the middle intersection 203 are both straight ribs 202 and cross in an “X” shape.

[0123] Furthermore, as shown in Figures 9-13, the housing assembly further includes annular ribs 202, each of which surrounds the periphery of a central intersection 203, and the two cross ribs forming the central intersection 203 both pass through the annular ribs, thereby further reducing local deformation of the cover plate, ensuring the overall flatness of the cover plate, and preventing deformation of the cover plate such as warping or overall arching into a U-shape. Specifically, as shown in Figure 10, points a, b, and c in the figure are all ribs 202, of which points a and b are two straight cross ribs, forming the central intersection 203 in the middle, and point c is an annular rib that surrounds the periphery of the cross ribs.

[0124] Preferably, as shown in FIG. 10 , a plurality of annular ribs 202 may be provided, and the centers of the plurality of annular ribs 202 coincide with each other, so as to better improve the force balance of the cover plate 20 .

[0125] In other embodiments, as shown in FIG. 14 to FIG. 16 , only two cross ribs may be provided on the cover plate 20 , crossing in an “X” shape.

[0126] This embodiment further discloses a battery, as shown in Figures 12-13, or Figures 15-16, which includes a battery cell 70 and a housing assembly as described in any of the above embodiments. The battery cell 70 is located inside the housing 10. The positive electrode of the battery cell 70 is electrically connected to the positive electrode member 30, and the negative electrode of the battery cell 70 is electrically connected to the negative electrode member 50.

[0127] Example 3

[0128] Referring to Figures 17-20 , the main difference between this embodiment and Example 2 lies in the fact that the multiple ribs 202 comprise multiple rows of horizontally arranged linear ribs and multiple columns of vertically arranged linear ribs. Each row of horizontally arranged linear ribs intersects with all of the vertically arranged linear ribs. In other words, the intersections form a grid pattern in the shape of a "well." As shown in Figure 20 , each of these ribs 202 is also formed by protruding outward from the inner wall of the cover plate 20.

[0129] Specifically, as shown in FIG17 , points d and e in the figure are both straight ribs, wherein point d is a longitudinal straight rib and point e is a transverse straight rib, and the two cross each other.

[0130] The arrangement of the ribs 202 in the above embodiment is more convenient for processing and can effectively prevent the cover plate 20 from being deformed and affecting the flatness.

[0131] This embodiment further discloses a battery, as shown in Figures 19 and 20, comprising a battery cell 70 and a housing assembly as described in any of the above embodiments, wherein the battery cell 70 is located within the housing 10. The positive electrode of the battery cell 70 is electrically connected to the positive electrode member 30, and the negative electrode of the battery cell 70 is electrically connected to the negative electrode member 50.

[0132] Example 4

[0133] The difference between this embodiment and the above embodiments is that a plurality of pits 201 and a plurality of ribs 202 protruding from the cover plate 20 are provided on the cover plate 20 of this embodiment, that is, this embodiment is a combination of embodiment 1 and embodiment 2, or a combination of embodiment 1 and embodiment 3. This method can better avoid deformation of the cover plate 20 and ensure the flatness of the cover plate 20 to the greatest extent.

[0134] The solutions of the above embodiments can effectively prevent deformation of the cover plate, thereby improving the flatness of the cover plate and avoiding deformation such as warping and overall arching, which is more conducive to the assembly of the cover plate and the shell, and improves the assembly efficiency and assembly accuracy of the two.

[0135] Example 5

[0136] 21 to 32 , the main difference between this embodiment and the first embodiment is that the shell 10 includes two oppositely arranged first side panels 103 , both ends of the two first side panels 103 are respectively connected to a second side panel 104 , and a corner 108 is formed at the connection between the first side panel 103 and the second side panel 104 .

[0137] The first side plate 103 includes a first plate portion 1031 , a second plate portion 1032 and a connecting portion 1033 connected between the first plate portion 1031 and the second plate portion 1032 . The first plate portion 1031 protrudes from the second plate portion 1032 .

[0138] The first plate portion 1031 protrudes from the second plate portion 1032 to form a step structure. By adding a step structure to the side wall of the battery shell 10, the structural strength of the battery shell 10 is enhanced, thereby improving the drop resistance, which is beneficial to reducing the risk of deformation of the battery shell 10 when the battery falls, and the internal battery cell 70 is not easily squeezed by the battery shell 10 and functional problems occur.

[0139] In some embodiments, as shown in Figures 23 and 24, the protrusion distance H1 of the first plate portion 1031 relative to the second plate portion is 0.05 to 1.0 mm, and the spacing distance H2 between the first plate portion 1031 and the second plate portion 1032 along their respective extension directions is 0.05 to 5.0 mm. In Figure 22, the protrusion direction of the first plate portion 1031 relative to the second plate portion 1032 is consistent with the width direction Y of the housing 10. The protrusion distance H1 refers to the spacing distance between the connected ends of the two plate portions in the width direction Y. The extension direction of the first plate portion 1031 and the second plate portion 1032 is consistent with the length direction X of the housing 10. The spacing distance H2 refers to the spacing distance between the connected ends of the two plate portions in the length direction X. By setting the distances H1 and H2, the size of the step structure is made more reasonable, which is conducive to ensuring the drop resistance of the battery housing 10.

[0140] The outer surface of the connecting portion 1033 includes one or a combination of a curved surface, a flat surface, and an inclined surface.

[0141] In some embodiments, the connecting portion 1033 is plate-shaped, and the angle α between it and the first plate portion 1031 is 90° to 180°. In the embodiment shown in FIG23 , the angle α between the connecting portion 1033 and the first plate portion 1031 is 135°, which provides a more balanced structural strength in the width and length directions.

[0142] In some embodiments, as shown in FIG24 , the connecting portion 1033 includes a first arc portion 10331 connected to the second plate portion 1032, and a second arc portion 10332 connected between the first arc portion 10331 and the first plate portion 1031. The centers of curvature of the first arc portion 10331 and the second arc portion 10332 are located on either side of the connecting portion 1033, and the first arc portion 10331 and the second plate portion 1032, as well as the second arc portion 10332 and the first plate portion 1031, form a smooth transition. The provision of the first arc portion 10331 and the second arc portion 10332 can reduce internal stress at the turning point of the first side plate 103 and facilitate processing and forming.

[0143] Optionally, the cross-sections of the first arc portion 10331 and the second arc portion 10332 are arc-shaped, roughly forming an S-shaped structure, and the radius R1 of the first arc portion 10331 can be greater than, less than or equal to the radius R2 of the second arc portion 10332. Preferably, as shown in Figure 24, the radius R1 of the first arc portion 10331 is greater than the radius R2 of the second arc portion 10332. Through the structural design of the connecting portion 1033, the drop resistance of the shell 10 can be effectively enhanced.

[0144] Optionally, the connecting portion 1033 has the same wall thickness as the first plate portion 1031 and the second plate portion 1032 .

[0145] As shown in Figures 22 to 24, the first plate portion 1031 and the second plate portion 1032 are arranged parallel and spaced apart; the two first side plates 103 are arranged symmetrically around the center, resulting in an aesthetically pleasing appearance and a rational design. The width of the battery housing 10 is substantially uniform at all locations, which helps ensure the capacity of the battery housing 10 and prevents a reduction in battery charge due to a reduction in the capacity of the battery housing 10.

[0146] In other feasible embodiments, as shown in FIG29 , the open end 101 of the housing 10 for connection to the cover plate 20 is provided with an outwardly extending flange 105, and the cover plate 20 is connected to the flange 105. Preferably, the flange 105 is arranged parallel to the cover plate 20 and extends horizontally away from the accommodating cavity 102. The cover plate 20 can be connected to the flange 105 by welding and then dispensing glue, thereby sealing the accommodating cavity 102. The accommodating cavity 102 is a cavity for accommodating the battery cell 70 and is connected to the open end 101.

[0147] In some embodiments, as shown in FIG22 , the cross-section of the second side panel 104 is linear and can be made directly of sheet material, such as a flat plate; in other embodiments, as shown in FIG26 , the second side panel 104 can also be configured to have the same structure as the first side panel 103 , that is, a connecting portion 1033 is also provided on the second side panel 104 to form a step structure, so as to further enhance the drop resistance of the shell 10 .

[0148] Among them, a positive electrode component 30 and a negative electrode component 50 are connected to a second side plate 104. The housing 10 is a conductive component, and the positive electrode component 30 is connected to the housing 10 through an insulating component. In this case, the housing 10 and the negative electrode component 50 together act as the negative electrode, and the negative electrode component 50 can be welded to the housing 10.

[0149] The bottom plate and cover plate 20 of the shell 10 are both made of metal or alloy material, and the alloy material is preferably stainless steel, and more preferably stainless steel 316L. Preferably, in this embodiment, the bottom plate and cover plate 20 are both made of conductive stainless steel. As shown in Figures 27 to 29, the cross-sectional shape of the bottom plate and cover plate 20 corresponds to the cross-sectional shape of the accommodating cavity 102. At this time, the shell 10 can be provided with only one open end 101, and the open end 101 is covered by the cover plate 20, and the bottom surface of the shell 10 opposite to the shell 10 is the above-mentioned bottom plate, or two open ends 101 can be provided, and in this case, each open end 101 is provided with a cover plate 20.

[0150] In some embodiments, the insulating assembly includes an outer insulating member 90 and an inner insulating member 100. The positive electrode member 30 passes through the second side plate 104 where it is located. One end of the positive electrode member 30 is insulated from the shell 10 by the outer insulating member 90. The other end of the positive electrode member 30 extends into the interior of the shell 10 and is connected to the conductive sheet 200. The conductive sheet 200 and the shell 10 are insulated by the inner insulating member 100.

[0151] Specifically, as shown in Figures 25 and 30, the positive electrode component 30 includes a positive electrode column 301 and a first sheet 302 and a second sheet 303 connected to the two ends of the positive electrode column 301. The positive electrode column 301 passes through the second side plate 104 and extends to the outside of the second side plate 104. The outer insulating component 90, the inner insulating component 100 and the conductive sheet 200 are all arranged around the outside of the positive electrode column 301, and the second sheet 303 is located on the outside of the conductive sheet 200.

[0152] As shown in Figures 25 and 27 to 29, the second side plate 104 is also provided with an injection hole 107 for allowing electrolyte to enter the accommodating chamber 102. The injection hole 107 is installed with a liquid blocking plug 60. The liquid blocking plug 60 is made of stainless steel, and the electrolyte is conveniently filled into the accommodating chamber 102 through the injection hole 107.

[0153] Furthermore, as shown in FIG. 27 to FIG. 29 , at least one explosion-proof groove 204 is provided on both the bottom plate and the cover plate 20 to facilitate pressure relief. The explosion-proof groove 204 is arc-shaped and faces the accommodating cavity 102 .

[0154] As shown in Figures 31 and 32, the present invention further provides a battery comprising a battery cell 70 and a housing assembly as described in any of the above embodiments. The battery cell 70 is located in a housing cavity 102 within the housing 10. The positive electrode of the battery cell 70 is electrically connected to the positive electrode member 30, and the negative electrode of the battery cell 70 is electrically connected to the negative electrode member 50. The housing cavity 102 may be filled with an electrolyte.

[0155] As a preferred embodiment, the battery cell 70 is arranged in a conformal or non-conformal manner to the accommodating cavity 102. As shown in FIG32 , the shape of the battery cell 70 corresponds to the cross-sectional shape of the accommodating cavity 102 to fully utilize the internal space of the battery shell 10 and increase the battery power.

[0156] Example 6

[0157] 33 to 37 , the main difference between this embodiment and the first embodiment is that the housing 10 includes two first side panels 103 disposed opposite to each other, both ends of the two first side panels 103 are connected to a second side panel 104 , and a corner 108 is formed at the connection between the first side panel 103 and the second side panel 104 ;

[0158] Among them, corner ribs 109 are formed at the corners 108 of the shell 10, and the corner ribs 109 protrude from the outer wall of the shell 10. There is a first recessed portion 1091 inside the corner ribs 109, and the first recessed portion 1091 is recessed outward from the inner wall of the shell 10.

[0159] Preferably, the housing 10 may be rectangular.

[0160] It is understandable that the open end 101 may be provided at only one end of the housing 10 , or the cover plates 20 may be provided at both ends of the housing 10 , with each open end 101 being sealed by a corresponding cover plate 20 .

[0161] The corners 108 of the housing 10 are prone to deformation. Once deformation occurs, the entire housing 10 will also experience significant deformation. Providing corner ribs 109 at the corners 108 effectively enhances the rigidity of the corners 108, thereby preventing deformation of the entire housing 10. Furthermore, the corner ribs 109 are formed by recessing outward from the inner wall, rather than welding a separate rib directly to the outer wall of the housing 10. This reduces welding defects and deformation, thereby better ensuring the strength of the housing 10, while also increasing the internal space of the housing 10 and reducing welding costs.

[0162] In some embodiments, the maximum distance that the corner ribs 109 protrude from the outer wall of the housing 10 is less than 0.1 mm, so as to ensure the strength of the housing 10 while preventing the housing 10 from being too large.

[0163] Furthermore, both sides of the corner rib 109 at each corner 108 are connected to the outer walls of the shell 10 on both sides of the corner 108 through the arc-shaped transition portion 1092 to further reduce stress concentration and improve the rigidity of the shell 10.

[0164] In some embodiments, at least two corner ribs 109 are provided at each corner 108 of the housing 10 along the height direction (Z direction). Alternatively, one corner rib 109 may be provided at each corner 108 of the housing 10, but the length of the corner rib in the height direction (Z direction) may be appropriately increased to better ensure the strength of the housing 10. The Z direction is the height direction of the housing 10, and the X direction is the length direction of the housing 10, with the X direction being perpendicular to the Z direction.

[0165] When at least two corner ribs 109 are provided at each corner 108 of the housing 10 along the height direction, the distance between two adjacent corner ribs 109 104 is greater than 0.5 mm to facilitate processing.

[0166] In some embodiments, a positive electrode member 30 and a negative electrode member 50 are connected to a second side plate 104 to lead out the positive and negative electrodes of the internal battery cell 70. The housing 10 is a conductive member, and the positive electrode member 30 is connected to the housing 10 via an insulating component.

[0167] Furthermore, the insulating assembly uses an insulating sheet 40 made of a hot-melt material. The positive electrode 30 is connected to the housing 10 by hot-melt connection via the insulating sheet 4030, and the negative electrode 50 is welded to the outer wall of the housing 10. The insulating sheet 40 can be made of a non-metallic material. To further ensure the hot-melt effect, the insulating sheet 40 can be made of polypropylene (PP plastic).

[0168] In the above structure, the shell 10 and the negative electrode sheet are used as a whole as a negative electrode, and the positive electrode sheet and the shell 10 are insulated and isolated by the insulating sheet 40 .

[0169] Furthermore, a mounting hole 106 is provided on the housing 10 , and the positive electrode member 30 extends through the insulating sheet 40 into the mounting hole 106 so as to be electrically connected to the positive electrode of the internal battery cell 70 .

[0170] The negative electrode member 50 may be made of nickel, and the positive electrode member 30 may be made of aluminum.

[0171] In some embodiments, a liquid injection hole 107 is further provided on the second side plate 104 where the positive electrode member 30 and the negative electrode member 50 are located to facilitate the injection of electrolyte into the shell 10. The liquid blocking plug 60 can be directly welded to the shell 10 and seal the liquid injection hole 107108.

[0172] Furthermore, the liquid blocking plug 60 is connected to the housing 10 via a metal gasket 80 ; the liquid blocking plug 60 may be made of steel.

[0173] This embodiment further discloses a battery, including the above-mentioned shell 10 , wherein a battery cell 70 is disposed inside the shell 10 , wherein the positive electrode of the battery cell 70 is electrically connected to the positive electrode member 30 , and the negative electrode of the battery cell 70 is electrically connected to the negative electrode member 50 .

[0174] Example 7

[0175] 38-43 , the main difference between this embodiment and the sixth embodiment is that the positive electrode member 30 and the negative electrode member 50 are arranged on a second side plate 104 , and the other second side plate 104 and the two first side plates 103 are each provided with a transverse rib 110 , which protrudes from the outer wall of the shell 10 and has a second recessed portion 1101 therein, which is recessed outward from the inner wall of the shell 10 .

[0176] Alternatively, the transverse ribs 110 may be provided only on the two first side panels 103 , or only on one second side panel 104 .

[0177] By coordinating the transverse ribs 110, the corner ribs 109, etc., the strength of the shell 10 can be effectively enhanced to prevent the shell 10 from deformation, thereby providing better protection for the internal battery cells 70 and improving the reliability and service life of the battery.

[0178] In some embodiments, the maximum distance that the transverse rib 110 protrudes from the outer wall of the housing 10 is less than 0.1 mm, so as to ensure the strength of the housing 10 while preventing the housing 10 from being too large.

[0179] In some embodiments, at least two transverse ribs 110 are provided along the height direction on the side panel where the transverse ribs 110 are located; alternatively, only one transverse rib 110 may be provided on the corresponding side panel of the shell 10, but the length of the transverse rib 110 in the height direction (Z direction) may be appropriately increased to better ensure the strength of the shell.

[0180] When at least two transverse ribs 110 are provided along the height direction at the corresponding side panels of the housing 10 , the distance between two adjacent transverse ribs 110 is greater than 0.5 mm to facilitate processing.

[0181] This embodiment further discloses a battery, comprising the shell 10 described in any one of the above items, wherein a battery cell 70 is disposed inside the shell 10 , wherein the positive electrode of the battery cell 70 is electrically connected to the positive electrode member 30 , and the negative electrode of the battery cell 70 is electrically connected to the negative electrode member 50 .

[0182] Example 8

[0183] 44-46 , the main difference between this embodiment and the sixth embodiment is that the positive electrode member 30 and the negative electrode member 50 are arranged on a second side plate 104 , and the other second side plate 104 and the two first side plates 103 are each provided with a longitudinal rib 111 , which protrudes from the outer wall of the shell 10 and has a third recessed portion 1111 therein, which is recessed outward from the inner wall of the shell 10 .

[0184] Alternatively, the longitudinal ribs 111 may be provided only on the two first side panels 103 , or only on one second side panel 104 .

[0185] The longitudinal ribs 111 and the corner ribs 109 can effectively enhance the strength of the housing 10 and prevent the housing 10 from deforming, thereby providing better protection for the internal battery cells 70 and improving the reliability and service life of the battery.

[0186] In some embodiments, the maximum distance that the longitudinal rib 111 protrudes from the outer wall of the shell 10 is less than 0.1 mm, so as to ensure the strength of the shell 10 while preventing the shell 10 from being too large.

[0187] In some embodiments, at least two longitudinal ribs 111 are provided on the side panel where the longitudinal ribs 111 are located in a direction perpendicular to the height direction (X direction); further, the distance between two adjacent longitudinal ribs 111 is greater than 0.5 mm to facilitate processing.

[0188] This embodiment further discloses a battery, comprising the shell 10 described in any one of the above items, wherein a battery cell 70 is disposed inside the shell 10 , wherein the positive electrode of the battery cell 70 is electrically connected to the positive electrode member 30 , and the negative electrode of the battery cell 70 is electrically connected to the negative electrode member 50 .

[0189] Embodiment 9

[0190] Referring to Figures 47 to 53, the main difference between this embodiment and the first embodiment is that: as shown in Figures 51 to 53, the cover plate 20 and the shell 10 are welded together through a welding mark portion 300, the welding mark portion 300 has a notch 3001, and the notch 3001 is sealed by a sealing colloid 400. The sealing colloid 400 is configured to rupture to form a pressure relief port when the internal pressure of the shell 10 reaches a first pressure.

[0191] When the battery experiences abnormal conditions such as overcharge, over-discharge, short circuit, and extrusion, a large amount of gas is generated inside the battery shell 10, causing the internal pressure of the shell 10 to increase rapidly. Since the strength of the sealing colloid 400 is weaker than that of the surrounding area, when the pressure increases to the first pressure, the pressure will cause the sealing colloid 400 to tear, thereby forming a pressure relief vent to achieve pressure relief. Moreover, usually when the battery experiences the above-mentioned abnormal phenomena, in addition to the generation of a large amount of gas inside the shell 10, a large amount of heat is generally released, causing the battery temperature to rise rapidly. This temperature will also make the sealing colloid 400 more likely to tear or melt and crack, thereby forming the above-mentioned pressure relief vent, thereby achieving the purpose of pressure relief and explosion prevention.

[0192] The shell assembly of the above structure does not need to cut grooves on the cover plate 20 to prepare an explosion-proof valve. Instead, a pressure relief port is formed by sealant to achieve pressure relief. The structure is simpler and the preparation process is simplified. It not only ensures the reliability of pressure relief, but also makes the processing of the pressure relief structure more convenient and greatly reduces the processing cost.

[0193] The cover plate 20 and the housing 10 are welded by penetration welding, and the welding mark 300 is formed between the cover plate 20 and the housing 10 after welding.

[0194] Penetration welding is a welding method that uses a welding heat source to completely melt two or more workpieces, forming a single unit. During penetration welding, the weld metal completely penetrates the workpieces, achieving a curved connection. Penetration welding does not require the use of filler material, but instead directly uses a high-energy heat source to melt the parent material, thus achieving the weld.

[0195] In some embodiments, an open end 101 may be provided at only one end of the shell 10, or as shown in FIG47 , open ends 101 may be provided at both ends of the shell 10, each open end 101 being closed by a corresponding cover plate 20, and each cover plate 20 and the shell 10 being welded together via a weld mark portion 300.

[0196] 53 , the housing 10 is rectangular, and the weld mark portion 300 is a rectangular frame with a notch 3001. During welding, welding can be performed around the edge of the housing 10 to form a rectangular weld mark portion 300, and the welding path is not closed to leave the notch 3001.

[0197] In some embodiments, the explosion-proof housing assembly further includes a positive electrode component 30 and a negative electrode component 50, the shell 10 is a conductive element, the insulating assembly uses an insulating sheet 40 made of hot-melt material, the positive electrode component 30 is hot-melt connected to the shell 10 through the insulating sheet 40, and the negative electrode component 50 is welded to the outer wall of the shell 10.

[0198] In the above structure, the housing 10 and the negative electrode sheet are used as a whole as a negative electrode, and the positive electrode sheet and the housing 10 are insulated and isolated by the insulating sheet 40. The housing 10 can be made of stainless steel.

[0199] The insulating sheet 40 may be an insulator made of non-metallic materials. To further ensure the hot-melt effect, the insulating sheet 40 may be made of polypropylene material (PP plastic).

[0200] The negative electrode member 50 may be made of nickel, and the positive electrode member 30 may be made of aluminum.

[0201] Furthermore, as shown in FIG53 , a mounting hole 106 is provided on the shell 10 , and the positive electrode member 30 includes a positive electrode column 301 , which extends through the insulating sheet 40 into the mounting hole 106 to facilitate electrical connection with the positive electrode of the battery cell 70 .

[0202] In some embodiments, the explosion-proof housing assembly further includes a liquid blocking plug 60 . A liquid injection hole 107 is provided on the housing 10 to facilitate injection of electrolyte into the housing 10 . The liquid blocking plug 60 is welded to the housing 10 and blocks the liquid injection hole 107 .

[0203] Furthermore, the liquid blocking plug 60 is connected to the housing 10 via a gasket 80 ; both the liquid blocking plug 60 and the gasket 80 may be made of steel.

[0204] In some embodiments, the cover plate 20 is made of stainless steel.

[0205] In some embodiments, the sealing colloid 400 is made of polypropylene (PP plastic).

[0206] This embodiment also discloses a battery, including the above-mentioned explosion-proof housing assembly. As shown in Figures 50 and 53, a battery cell 70 is provided inside the housing 10.

[0207] The positive electrode of the battery cell 70 is electrically connected to the positive electrode member 30 , and the negative electrode of the battery cell 70 is electrically connected to the negative electrode member 50 .

[0208] Furthermore, the battery cell 70 may be rectangular, which is more conducive to heat dissipation and has a higher energy density.

[0209] The battery of this embodiment realizes pressure relief by forming a pressure relief port with sealant, which has a simple structure and simplifies the manufacturing process. While effectively ensuring the reliability of pressure relief, it also makes the processing of the pressure relief structure more convenient, greatly reduces the processing cost, and improves the safety of battery use.

[0210] Example 10

[0211] The main difference between this embodiment and the ninth embodiment is that each welding mark portion 300 has at least two notches 3001 (not shown in the figure), and each notch 3001 is sealed by a sealing colloid 400 to achieve multi-point pressure relief.

[0212] The above structure can form pressure relief holes at the sealing colloid 400 of the plurality of notches 3001 when the internal pressure of the housing 10 reaches the first pressure, which is more conducive to improving the pressure relief speed.

[0213] In some embodiments, at least two notches 3001 in each weld mark portion 300 are oriented in different directions. For example, when the housing 10 is rectangular and the weld mark portion 300 is in the shape of a rectangular frame, one notch 3001 is located on one side of the left side of the rectangular weld mark portion 300, and the other notch 3001 is located on the other side of the front side. In other words, notches 3001 can be provided at different locations on the weld mark portion 300 to form multiple pressure relief ports in different directions, achieving multi-directional pressure relief and improving pressure relief speed and balance.

[0214] This embodiment further discloses a battery, including the above-mentioned shell assembly, wherein a battery cell 70 is disposed inside the shell 10 .

[0215] The battery of this embodiment realizes pressure relief by forming a pressure relief port through sealant, which effectively ensures the reliability of pressure relief and makes the processing of the pressure relief structure more convenient, greatly reduces the processing cost, and improves the safety of battery use.

[0216] All of the above optional technical solutions can be combined in any way to form optional embodiments of the present invention, that is, any multiple embodiments can be combined to meet the needs of different application scenarios. They are all within the scope of protection of this application and will not be described in detail here.

[0217] It should be noted that the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A housing assembly, characterized in that: Comprising, a housing having an open end; a cover plate connected to the housing and covering the open end, and a plurality of pits and / or a plurality of ribs protruding from the cover plate are provided on the cover plate.

2. The housing assembly according to claim 1, characterized in that: The plurality of pits on the cover plate are arranged in an array.

3. The housing assembly according to claim 1, wherein: The cross-section of the pit is rectangular, V-shaped or trapezoidal.

4. The outer shell component according to claim 1, characterized in that: At least two of the ribs are cross-arranged.

5. The housing assembly according to claim 4, wherein: Among the plurality of ribs, there are two cross-arranged ribs, and the intersection point of the two cross ribs is located in the middle of the cover plate to form a middle intersection point.

6. The housing assembly according to claim 5, wherein: Among the plurality of ribs, there is also a ring-shaped rib, and each ring-shaped rib surrounds the periphery of the middle intersection point, and the two cross ribs forming the middle intersection point both pass through the ring-shaped rib.

7. The housing assembly according to claim 6, characterized in that: Among the plurality of ribs, there are a plurality of ring-shaped ribs, and the centers of the plurality of ring-shaped ribs coincide.

8. The housing assembly according to claim 4, wherein: Among the plurality of ribs, there are multiple rows of linearly arranged ribs arranged horizontally and multiple columns of linearly arranged ribs arranged vertically, and each row of horizontally arranged linearly arranged ribs intersects with all vertically arranged linearly arranged ribs.

9. The outer shell assembly according to claim 1, characterized in that: The housing includes two relatively arranged first side plates, and second side plates are respectively connected to both ends of the two first side plates, and corners are formed at the joints of the first side plates and the second side plates.

10. The outer shell assembly according to claim 11, characterized in that: The first side plate includes a first plate portion, a second plate portion and a connecting portion connected between the first plate portion and the second plate portion, and the first plate portion protrudes from the second plate portion.

11. The housing assembly according to claim 10, characterized in that: The protruding distance of the first plate portion relative to the second plate portion is 0.05 - 1.0 mm, and the spacing distance between the first plate portion and the second plate portion along their extending directions is 0.05 - 5.0 mm.

12. The housing assembly according to claim 10, characterized in that: The outer surface of the connecting portion includes one or a combination of an arc surface, a plane, and an inclined surface.

13. The housing assembly according to claim 12, characterized in that: The connecting portion is plate-shaped, and the angle between it and the first plate portion is 90° - 180°.

14. The housing assembly according to claim 12, wherein: The connecting portion includes a first arc portion connected to the second plate portion and a second arc portion connected between the first arc portion and the first plate portion. The centers of curvature of the first arc portion and the second arc portion are located on both sides of the connecting portion, and the first arc portion and the second plate portion as well as the second arc portion and the first plate portion are in smooth transition.

15. The housing assembly according to claim 10, wherein: The first plate portion and the second plate portion are arranged in parallel at intervals; the two first side plates are symmetrically arranged about the center.

16. The housing assembly according to claim 10, characterized in that: A flange extending outward is provided at the open end of the housing, and the cover plate is connected to the flange.

17. The housing assembly according to claim 9, wherein: A positive electrode member and a negative electrode member are connected to one of the second side plates. The housing is a conductive member, and the positive electrode member is connected to the housing through an insulating assembly.

18. The housing assembly according to claim 17, wherein: The insulating assembly includes an outer insulating member and an inner insulating member. The positive electrode member passes through the second side plate where it is located. One end of the positive electrode member is insulated from the housing through the outer insulating member. The other end of the positive electrode member extends into the housing and is connected to a conductive sheet, and the conductive sheet and the housing are insulated from each other through the inner insulating member.

19. The housing assembly according to claim 17, characterized in that: The insulating assembly includes an insulating film, and the positive electrode member is heat-melted and connected to the housing through the insulating film.

20. The housing assembly according to claim 9, wherein: Corner rib plates are formed at the corners, the corner rib plates protrude from the outer wall of the housing, and a first recessed portion is formed inside the corner rib plates, and the first recessed portion recesses outward from the inner wall of the housing.

21. The housing assembly according to claim 20, characterized in that: The maximum distance that the corner rib plate protrudes from the outer wall of the housing is less than 0.1 mm.

22. The housing assembly according to claim 20, characterized in that: At least two of the corner rib plates are arranged along the height direction at each corner.

23. The housing assembly according to claim 20, wherein: Transverse rib plates are arranged on two of the first side plates and / or one of the second side plates, the transverse rib plates protrude from the outer wall of the housing, and a second recessed portion is formed inside the transverse rib plates, and the second recessed portion recesses outward from the inner wall of the housing.

24. The housing assembly according to claim 20, wherein: Longitudinal rib plates are arranged on two of the first side plates and / or one of the second side plates, the longitudinal rib plates protrude from the outer wall of the housing, and a third recessed portion is formed inside the longitudinal rib plates, and the third recessed portion recesses outward from the inner wall of the housing.

25. The housing assembly according to claim 1, wherein: The cover plate and the housing are welded through a welding scar portion, the welding scar portion has a notch, the notch is closed by a sealing colloid, and the sealing colloid is configured to rupture to form a pressure relief port when the internal pressure of the housing reaches a first pressure.

26. The housing assembly according to claim 1, wherein: The housing is rectangular, and the welding scar portion is in the shape of a rectangular frame and has the notch.

27. The housing assembly according to claim 1, characterized in that: The welding scar portion has at least two notches, and each notch is closed by the sealing colloid.

28. The housing assembly according to claim 1, wherein: The orientations of at least two of the notches in each welding scar portion are different.

29. The housing assembly according to claim 1, wherein: The housing has an open end, or open ends are provided at both ends of the housing, and each open end is closed by a corresponding cover plate.

30. The housing assembly according to claim 1, wherein: A liquid injection hole is further provided on the housing, and a liquid blocking plug is connected to the housing and blocks the liquid injection hole.

31. A battery, characterized in that: It includes the explosion-proof housing assembly according to any one of claims 1-30, and a battery cell is arranged inside the housing.

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