Battery box, battery device and electric equipment

Abstract

The embodiment of the application discloses a battery box, a battery device and an electric equipment, and relates to the battery field. The battery box can comprise a box body, a box cover and a pressing strip. The box body comprises an opening. The box cover covers the opening. The pressing strip is connected to the surface of the box cover away from the box body. The pressing strip is arranged around the edge of the box cover. The orthographic projection of the pressing strip along a first direction at least partially covers the orthographic projection of the connecting surface of the box body and the box cover along the first direction. The first direction is parallel to the thickness direction of the pressing strip. The pressing strip comprises a first pressing strip and a second pressing strip. At least part of the first pressing strip and at least part of the second pressing strip are stacked along the first direction to form an overlapping section. The first pressing strip and the second pressing strip can improve the sealing performance and stability of the battery box.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery housing, a battery device, and an electrical appliance. Background Technology

[0002] The battery casing is the load-bearing and protective structure of the battery device, mainly used to encapsulate battery cells, electrical connectors, and other components, providing protection. Most battery casings use an assembly structure where the cover and casing are directly snapped together and bolted together. The sealed connection area of ​​the casing is usually sealed and fixed through the sealing surfaces of the cover and casing. Under conditions of vehicle bumps, equipment vibration, and alternating hot and cold temperatures, the connection gap between the cover and casing is prone to loosening and warping, leading to seal failure and problems with water and dust ingress. Utility Model Content

[0003] This application provides a battery housing, a battery device, and an electrical appliance, which can improve the sealing and stability of the battery housing.

[0004] In a first aspect, this application provides a battery casing, comprising: a casing portion including an opening; a casing cover covering the opening; and a retaining strip connected to the surface of the casing cover away from the casing portion. The retaining strip is disposed around the edge of the casing cover, and the orthographic projection of the retaining strip along a first direction at least partially covers the orthographic projection of the connection surface between the casing portion and the casing cover along the first direction. The first direction is parallel to the thickness direction of the retaining strip. The retaining strip includes a first retaining strip and a second retaining strip, and at least a portion of the first retaining strip and at least a portion of the second retaining strip are stacked along the first direction to form an overlapping segment.

[0005] In this embodiment, by covering the opening of the box body with a box cover and setting a pressure strip on the side of the box cover away from the box body, the pressure strip is divided into a first pressure strip and a second pressure strip and stacked to form an overlapping section. This not only uses the pressure strip to press and limit the connection between the box cover and the box body, ensuring uniform and continuous force, but also improves the sealing, dustproof, waterproof and vibration-resistant structural stability of the battery box body. Furthermore, the use of a split and splicable structure eliminates the need for overall disassembly and replacement. Each pressure strip can be disassembled and maintained individually, and can be partially replaced. This makes disassembly and assembly convenient, maintenance costs low, and facilitates later inspection and replacement of parts.

[0006] In some embodiments of the first aspect, the lid includes intersecting and connected first and second edges, and the orthographic projection of the overlapping segment along a first direction covers the junction of the first and second edges.

[0007] In this embodiment, the cover is set as a polygon and includes an adjacent first edge and a second edge. The first pressure strip and the second pressure strip form an overlapping section at the connection point on both sides and cover the connection point. The weak corner seal of the polygonal cover is double-compacted and limited, eliminating the blind spot of the corner docking, avoiding corner warping, loosening and sealing failure, improving the overall vibration resistance and sealing performance of the battery box. The split overlapping structure can be disassembled and maintained separately and the pressure strip can be replaced locally. The disassembly and maintenance are convenient and the later operation and maintenance costs are reduced.

[0008] In some embodiments of the first aspect, the lid includes a first edge and a second edge, the extension dimension of the first edge being greater than the extension dimension of the second edge, the first edge including a middle segment and an end segment, the end segment being located on at least one side of the middle segment along a second direction, the middle segment crossing the centerline of the first edge, and the orthographic projection of the overlapping segment along the first direction being located within the orthographic projection of the end segment along the first direction; wherein, the second direction is the extension direction of the first edge.

[0009] In this embodiment, the cover includes a larger first edge, and the end segments are arranged on one or both sides of the center line of the first edge. The orthographic projection of the overlapping segment along the first direction is located within the orthographic projection of the end segment along the first direction. This can locate the overlapping position of the segmented pressure strip, avoid the stress concentration point of the middle section of the first edge, distribute the overlapping load of the overlapping segment to the end segment, balance the pressure force distribution of the pressure strip on the long side of the cover, reduce stress concentration at the center line, avoid edge warping and sealing failure due to excessive local stress, and improve the overall sealing reliability and structural stability of the battery box.

[0010] In some embodiments of the first aspect, the ratio of the dimension of the overlapping segment along the second direction to the dimension of the first edge along the second direction is k1, and the value of k1 is in the range of 1 / 12≤k1≤1 / 3.

[0011] In this embodiment, the ratio of the dimension of the overlapping section extending along the first edge to the overall length of the first edge is limited to 1 / 12 to 1 / 3, so that the first pressure strip and the second pressure strip can reliably overlap, improving the sealing performance of the battery box, avoiding insufficient overlap strength and stress concentration due to the overlapping section being too short, and preventing material redundancy and stress transfer to the middle of the first edge due to the overlapping section being too long, reducing the load and stress level in the middle of the first edge, avoiding deformation and cracking damage due to excessive load in the middle, and taking into account both assembly reliability and stress optimization.

[0012] In some embodiments of the first aspect, the dimension S1 of the overlapping segment along the second direction ranges from 30mm ≤ S1 ≤ 90mm.

[0013] In this embodiment, the dimension S1 of the overlapping section along the extension direction of the first edge is limited to the range of 30mm to 90mm. This satisfies the overlap length of the first and second pressure strips, ensuring a stable and reliable connection and improving the sealing performance of the battery box. It also avoids insufficient overlap strength and stress concentration caused by an excessively small overlapping section, while reducing the possibility of material redundancy and stress transfer to the center of the first edge due to an excessively large size. This reduces the load and stress level in the center of the first edge, and minimizes the possibility of deformation, cracking, and damage caused by excessive load in the center.

[0014] In some embodiments of the first aspect, the first pressure strip includes a plurality of first mounting holes, the second pressure strip includes a plurality of second mounting holes, and the cover includes a plurality of third mounting holes; the battery case also includes a first fixing member and a second fixing member, the first fixing member passing through the corresponding first mounting hole and the third mounting hole, and the second fixing member passing through the corresponding second mounting hole and the third mounting hole.

[0015] In this embodiment, by setting a first mounting hole and a second mounting hole on the first pressure strip and the second pressure strip respectively, and setting a third mounting hole on the corresponding box cover, the first and second pressure strips are fixed by the first and second fixing parts. This achieves quick alignment, convenient installation, and reliable positioning of the two pressure strips when assembling with the box cover, and also allows for individual disassembly and maintenance, partial replacement of the pressure strips, and convenient repair.

[0016] In some embodiments of the first aspect, the first pressure strip includes a first segment and a second segment, and the second pressure strip includes a third segment and a fourth segment, with the first segment and the third segment stacked to form an overlapping segment; the ratio of the distance between the centers of two adjacent first mounting holes of the first segment to the distance between the centers of two adjacent first mounting holes of the second segment is k2, and the value of k2 is in the range of 0.5≤k2≤1; and / or the ratio of the distance between the centers of two adjacent second mounting holes of the third segment to the distance between the centers of two adjacent second mounting holes of the fourth segment is k3, and the value of k3 is in the range of 0.5≤k3≤1.

[0017] In this embodiment, k2 and k3 are limited to a numerical range of 0.5 to 1, so that the hole spacing of the mounting holes in the first and third segments is less than or equal to the hole spacing of the mounting holes in the respective body areas of the pressure strip. This achieves a denser arrangement of mounting holes in the overlapping segments and a moderate increase in locking points, enabling multi-point uniform locking of the overlapping area of ​​the pressure strip and the corner connection area of ​​the cover. The denser hole arrangement can distribute the concentrated load to each mounting fixing point, avoiding local stress concentration, and ensuring a tight connection between the pressure strip and the cover, and between the cover and the box body, suppressing warping, loosening, and gap expansion. This ratio range balances the hole density and the structural strength of the pressure strip, matching the fixing point layout, force transmission, and assembly reliability of the overlapping and non-overlapping segments.

[0018] In some embodiments of the first aspect, the distance S2 between the centers of two adjacent first mounting holes in the first segment is in the range of 15mm≤S2≤90mm; and / or the distance S3 between the centers of two adjacent second mounting holes in the third segment is in the range of 15mm≤S3≤90mm.

[0019] In this embodiment, the adjacent spacing S2 of the first mounting hole is limited to the range of 15mm to 90mm, and / or the adjacent spacing S3 of the second mounting hole is limited to the range of 15mm to 90mm. This avoids the problems of excessively dense mounting hole arrangement due to excessively small hole spacing, which weakens the structural strength of the pressure strip base and causes stress concentration, processing redundancy and assembly interference. It also reduces the possibility of sparse locking points and insufficient constraint force due to excessively large hole spacing, which may cause warping and slippage of the pressure strip corners, sealing failure and concentrated overload. It can keep the mounting holes of the overlapping section at a reasonable and moderate layout density, form multi-point uniform locking for the overlapping section and the weak area of ​​the box corner, and improve the connection stiffness and vibration and torsional resistance of the overlapping section.

[0020] In some embodiments of the first aspect, the overlapping segment includes a first segment of the first pressure strip and a third segment of the second pressure strip; the thickness of the overlapping segment is equal to the thickness of the remaining portion of the first pressure strip excluding the first segment; and / or the thickness of the overlapping segment is equal to the thickness of the remaining portion of the second pressure strip excluding the third segment.

[0021] In this embodiment, the thickness of the overlapping section is set to be equal to the thickness of the non-overlapping areas of the first and second pressure strips, which can achieve a smooth and continuous outer surface of the pressure strip without any steps. After assembly, the transition is smooth and regular, which avoids the risk of assembly height difference and local protrusion interference, and also makes the force uniform and the clamping force evenly distributed when the fastener is locked. The equal thickness structure can make the overall stiffness of the pressure strip consistent and the mechanical properties uniform, avoiding stress concentration caused by local stiffness abrupt change due to thickness difference, improving the overall vibration resistance and deformation resistance of the pressure strip, and maintaining the stable sealing performance of the box.

[0022] In some embodiments of the first aspect, the thickness h of the overlapping segment ranges from 1 mm to h to 8 mm.

[0023] In this embodiment, the thickness h of the overlapping section is limited to the range of 1mm to 8mm. This thickness range enables the overlapping section to have moderate and sufficient structural rigidity, bending and torsional strength and load-bearing capacity, and can resist the effects of assembly preload, vibration impact and torsional shear load. It is not easy to bend, dent or warp deformation, and always maintains a tight fit with the surface of the box cover to meet the sealing requirements. The moderate thickness value can control the weight of the pressure strip material, meet the requirements of lightweight and compact layout of battery box, and avoid material redundancy and space interference problems.

[0024] In some embodiments of the first aspect, the overlapping segment includes a first segment of the first pressure strip and a third segment of the second pressure strip; the thickness of the first segment is equal to the thickness of the remaining portion of the first pressure strip excluding the first segment; and / or the thickness of the third segment is equal to the thickness of the remaining portion of the second pressure strip excluding the third segment.

[0025] In this embodiment, the first segment is the same thickness as the rest of the first pressure strip, and the third segment is the same thickness as the rest of the second pressure strip, so that the thickness of a single pressure strip is uniform, the surface transition is smooth and flat, and there are no step differences or local unevenness. This makes the overall mechanical properties of the pressure strip uniform and stable, avoids stress concentration caused by sudden changes in thickness, and also allows the pressure strip to fit snugly with the box cover after assembly, with balanced force, and there will be no problem of local false pressure or overpressure.

[0026] In some embodiments of the first aspect, the first pressure strip and / or the second pressure strip includes an extension that extends along a first direction and covers at least a portion of the outer surface of the sidewall of the housing portion; wherein the sidewall of the housing portion is parallel to the first direction.

[0027] In this embodiment, the first pressure strip and / or the second pressure strip are provided to extend along a first direction perpendicular to the box cover and cover the extension section of the box body. This can form a lateral limiting constraint and physical protection on the outer surface of the side wall of the box body, limit the horizontal offset and torsional deformation of the box cover and the box body, suppress the opening of the joint at the connection, enhance the overall assembly rigidity and structural integrity, and have multiple functions of limiting protection and load optimization.

[0028] In some embodiments of the first aspect, the dimension S4 of the extension along the first direction is in the range of 1mm ≤ S4 ≤ 4mm.

[0029] In this embodiment, the dimension S4 of the extension section along the first direction is limited to the range of 1mm to 4mm. This allows the extension section to have a reasonable and moderate vertical extension height, which enables the extension section to cross downwards and cover the outside of the joint between the box body and the box cover, thus achieving the functions of shielding the joint, preventing dust and water, and providing external protection. At the same time, it forms a moderate lateral restraint on the side wall of the box body. It also controls the vertical protrusion of the extension section, reducing the possibility of spatial interference caused by excessive size and stress concentration at the root caused by excessive bending moment.

[0030] In some embodiments of the first aspect, the extension is connected to the side wall of the housing portion by a sealant.

[0031] In this embodiment, the extension section and the housing are bonded together with sealant, which not only fills and seals the gap between the two to form a continuous and sealed protective barrier, preventing external moisture, dust and corrosive media from penetrating into the housing, thus improving the overall waterproof, dustproof and corrosion-resistant performance; it also positions the extension section against the side wall of the housing, restraining its shaking, displacement, warping and loosening, enhancing the overall assembly integrity and structural stability, and making the structure simple and suitable for long-term complex working conditions.

[0032] In some embodiments of the first aspect, the material of the pressure strip is metal.

[0033] In this embodiment, the pressure strip is made of metal, which has higher structural strength and bending stiffness. It can reliably press and limit the cover and body of the battery box, improving the overall assembly integrity and structural torsional resistance of the battery box. At the same time, the metal material has good resistance to high and low temperatures, aging, fatigue and corrosion, strong environmental adaptability, and is not prone to loosening, cracking or deformation failure after long-term use. It is also easy to stamp, bend and form holes in one piece, taking into account structural stability, durability and production process adaptability.

[0034] Secondly, this application provides a battery device, including: a plurality of battery cells; a battery housing, the battery housing including the battery housing in the first aspect, wherein the plurality of battery cells are housed in the battery housing.

[0035] Thirdly, this application provides an electrical device, including a battery device comprising the battery device described in the second aspect, the battery device being used to provide electrical energy.

[0036] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the vehicle structure according to an embodiment of this application; Figure 2 This is a schematic diagram of the battery device according to an embodiment of this application; Figure 3 This is a structural diagram of a battery cell according to an embodiment of this application; Figure 4 This is an exploded view of the battery casing according to an embodiment of this application; Figure 5 This is a structural diagram of the battery housing according to an embodiment of this application; Figure 6 This is a top view of the pressure strip according to an embodiment of this application; Figure 7 This is a top view of the box lid according to an embodiment of this application; Figure 8 This is another top view of the pressure strip according to an embodiment of this application; Figure 9 This is another top view of the box lid according to an embodiment of this application; Figure 10 This is another top view of the pressure strip according to an embodiment of this application; Figure 11 This is another top view of the pressure strip according to an embodiment of this application; Figure 12 This is another top view of the pressure strip according to an embodiment of this application; Figure 13 This is another top view of the pressure strip according to an embodiment of this application; Figure 14 This is a schematic diagram of the pressure strip according to an embodiment of this application; Figure 15 This is another structural diagram of the battery device according to an embodiment of this application; Figure 16 This is a partial structural diagram of the battery device according to an embodiment of this application; Figure 17 This is another partial structural diagram of the battery device according to an embodiment of this application; Figure 18 This is another structural diagram of the battery housing according to an embodiment of this application; Figure 19 This is a partial structural diagram of the battery box according to an embodiment of this application.

[0038] The accompanying drawings are not drawn to scale.

[0039] Figure label: 1000 - Vehicle; 100 - Battery assembly; 10 - Battery housing; 101 - First housing section; 102 - Second housing section; 11 - Housing section; 12 - Housing cover; 121 - First edge; 1211 - Middle section; 1212 - End section; 122 - Second edge; 123 - Third mounting hole; 13 - Pressure strip; 131 - Extension section; 14 - First pressure strip; 141 - First section; 142 - First mounting hole; 143 - Second section; 15 - Second pressure strip; 151 - Third section; 152 - Second mounting hole; 153 - Fourth section; 16 - Overlapping section; 171 - First fastener; 172 - Second fastener; 173 - Third fastener; 20 - Battery cell; 21 - Housing; 22 - End cap; 23 - Electrode terminal; 24 - Pressure relief mechanism; 200 - Motor; 300 - Controller. Detailed Implementation

[0040] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0041] 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 described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0043] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0047] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0048] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0049] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0050] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0051] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0052] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the occurrence of short circuits while allowing active ions to pass through.

[0053] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0054] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0055] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0056] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0057] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0058] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0059] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0060] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0061] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells.

[0062] In some embodiments, the negative electrode may be made of foamed metal.

[0063] As an example, negative electrode active materials can be filled and / or deposited within the negative electrode current collector.

[0064] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0065] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0066] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0067] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0068] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0069] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0070] Liquid electrolytes include electrolyte salts and solvents.

[0071] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0072] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid—lithium salt.

[0073] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0074] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0075] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0076] In some implementations, the electrode assembly is a stacked structure.

[0077] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0078] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0079] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0080] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0081] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0082] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0083] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0084] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0085] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic batteries. This application does not have any particular limitations.

[0086] In some embodiments, the battery cell includes a housing and an end cap, the housing having an opening and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0087] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector.

[0088] The electrode terminals can be located on the end cap or on the outer casing.

[0089] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0090] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0091] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0092] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0093] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0094] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0095] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0096] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0097] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0098] In some embodiments, the battery device may be a battery pack, which includes a battery housing and one or more individual battery cells housed within the battery housing.

[0099] As an example, a battery cell assembly can be a battery module, which can be housed in a battery housing by fixing the battery module in the battery housing.

[0100] As an example, battery cell assemblies can also be housed in a battery housing by directly fixing multiple battery cells to the battery housing.

[0101] As an example, the battery housing may include a first housing section and a second housing section. The first housing section and the second housing section are fastened together to form a closed space inside the battery housing for housing individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing section may be a top cover or a bottom plate.

[0102] As an example, the battery enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the battery enclosure to house individual battery cells.

[0103] In some embodiments, the battery housing may be part of the vehicle's chassis structure. For example, a portion of the battery housing may be at least a part of the vehicle's floor, or a portion of the battery housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0104] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0105] The battery casing is the load-bearing and protective structure for power battery packs and energy storage battery modules. It is mainly used to encapsulate battery cells, electrical connectors, and other components, providing protection. Most battery casings use an assembly structure where the cover and casing are directly snapped together and bolted together. The sealed connection area of ​​the casing is usually sealed and fixed through the sealing surfaces of the cover and casing. Under conditions of vehicle bumps, equipment vibration, and alternating hot and cold temperatures, the connection gap between the cover and casing is prone to loosening and warping, leading to seal failure and problems such as water and dust ingress.

[0106] Based on the above considerations, this application provides a battery housing that can improve the sealing and stability of the battery housing. The battery housing provided in this application may include a housing portion, a cover, and a pressure strip. The housing portion includes an opening; the cover closes to the opening; the pressure strip is located on the side of the cover away from the housing portion, and the pressure strip is disposed around the edge of the cover. The orthographic projection of the pressure strip along a first direction at least partially covers the orthographic projection of the connection surface between the housing portion and the cover along the first direction. The pressure strip includes a first pressure strip and a second pressure strip, and at least a portion of the first pressure strip and at least a portion of the second pressure strip are stacked along the first direction to form an overlapping section; wherein, the first direction is perpendicular to the cover.

[0107] In this embodiment, by covering the opening of the box body with a box cover and setting a pressure strip on the side of the box cover away from the box body, the pressure strip is divided into a first pressure strip and a second pressure strip and stacked to form an overlapping section. This not only uses the pressure strip to press and limit the connection between the box cover and the box body, ensuring uniform and continuous force, but also improves the sealing, dustproof, waterproof and vibration-resistant structural stability of the battery box body. Furthermore, the use of a split and splicable structure eliminates the need for overall disassembly and replacement. Each pressure strip can be disassembled and maintained individually, and can be partially replaced. This makes disassembly and assembly convenient, maintenance costs low, and facilitates later inspection and replacement of parts.

[0108] The technical solutions described in this application are applicable to various electrical devices that use battery devices. These electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0109] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0110] For example, Figure 1 This is a structural schematic diagram of the vehicle according to an embodiment of this application. Figure 1 As shown, vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100, a motor 200, and a controller 300 can be installed inside vehicle 1000. The controller 300 controls the battery device 100 to supply power to the motor 200. For example, the battery device 100 can be installed at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving force for vehicle 1000.

[0111] Figure 2 This is a schematic diagram of the battery device according to an embodiment of this application. Figure 2 As shown, the battery device 100 of this application embodiment may include a plurality of battery cells 20 to meet different power usage needs. It should be understood that, as Figure 2 As shown, the battery device 100 in this embodiment may further include a battery housing 10.

[0112] The battery housing 10 may include two parts, referred to herein as a first housing part 101 and a second housing part 102, which are fastened together. The shapes of the first housing part 101 and the second housing part 102 may be determined according to the shape of the components housed inside, for example, according to the shape of the combination of multiple battery cells 20 housed inside. At least one of the first housing part 101 and the second housing part 102 has an opening. For example, the first housing part 101 and the second housing part 102 may both be hollow cuboids with one face as an opening. The openings of the first housing part 101 and the second housing part 102 are arranged opposite to each other, and the first housing part 101 and the second housing part 102 are fastened together to form a battery housing 10 with a closed cavity, which can be used to house multiple battery cells 20. Multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the battery housing 10 formed by the fastening of the first housing part 101 and the second housing part 102.

[0113] For example, one of the first housing portion 101 and the second housing portion 102 may be a hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 102 as a hollow cuboid with one opening and the first housing portion 101 as a plate-shaped example, then the first housing portion 101 covers the opening of the second housing portion 102 to form a battery housing 10 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0114] Figure 3 This is a structural diagram of a battery cell according to an embodiment of this application. Figure 3 As shown, the battery cell 20 in this embodiment may include a housing 21, an end cap 22, an electrode terminal 23, and an electrode assembly.

[0115] The outer casing 21 is a hollow structure with an opening, and the electrode assembly is housed in the outer casing 21. The shape of the outer casing 21 can be determined according to the specific shape of the electrode assembly.

[0116] The outer shell 21 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. This application embodiment does not limit this.

[0117] End cap 22 is used to seal the opening to form a sealed mounting space for accommodating the electrode assembly. Electrode terminals 23 are mounted on end cap 22 for connection to the electrode assembly.

[0118] In some embodiments, a pressure relief mechanism 24 may also be installed on the end cap 22. When the internal pressure of the battery cell 20 rises abnormally, the pressure relief mechanism 24 is used to release the excessive pressure inside the battery cell 20, thereby reducing the possibility of dangerous situations such as the battery cell 20 exploding.

[0119] It should be understood that the shape of the battery cell 20 in this application embodiment can be flexibly set according to actual application, that is, the outer shell 21 of the battery cell 20 can be any polyhedral structure, for example, it can be set as a cuboid or a cylinder, etc.

[0120] Figure 4 This is an exploded view of the battery casing according to an embodiment of this application; Figure 5 This is a structural diagram of the battery housing according to an embodiment of this application. Figure 4 and Figure 5 As shown, the battery housing 10 may include a housing portion 11, a housing cover 12, and a retaining strip 13. The housing portion 11 includes an opening; the housing cover 12 closes to the opening; the retaining strip 13 is connected to the surface of the housing cover 12 away from the housing portion 11. The retaining strip 13 is arranged around the edge of the housing cover 12. The orthographic projection of the retaining strip 13 along a first direction at least partially covers the orthographic projection of the connection surface between the housing portion 11 and the housing cover 12 along the first direction. The first direction is parallel to the thickness direction of the retaining strip 13. The retaining strip 13 includes a first retaining strip 14 and a second retaining strip 15. At least a portion of the first retaining strip 14 and at least a portion of the second retaining strip 15 are stacked along the first direction to form an overlapping section 16.

[0121] The housing 11 serves as the support base for the battery cell 20, and has an internal cavity for accommodating the battery cell 20, wiring harness, and circuit board. The housing 11 is provided with an opening for installing the battery cell 20 and assembling the cover 12. The opening can be a top opening of the housing 11, which is used to achieve the closing assembly of the cover 12 and the housing 11, thus completing the closure of the internal cavity of the housing 11.

[0122] In some embodiments, the opening has a rectangular, square, or other shape adapted to the battery cell 20, and the edges of the opening have flat end faces for sealing connection with the cover 12.

[0123] The cover 12 matches the outline and size of the opening of the box body 11. The cover 12 is installed on the opening of the box body 11. Through the sealing fit between the cover 12 and the box body 11, the internal cavity of the box body 11 is sealed, thereby achieving basic protection for the internal battery components.

[0124] In some embodiments, the lid 12 may be made of sheet metal or plastic material and its shape matches the top opening of the box body 11. The lid 12 is fitted onto the opening of the box body 11 by means of alignment and snap-fit, bonding or bolt pre-fixing, so that the lower end face of the lid 12 is sealed to the upper end face of the opening of the box body 11, thereby sealing the receiving cavity of the box body 11.

[0125] For ease of description, this application embodiment defines three reference directions based on the battery box 10. The direction perpendicular to the top or bottom of the battery box 10 is the Y direction, i.e., the first direction. Here, the top refers to the cover 12 of the battery box 10, i.e., the uppermost plate surface of the battery box 10 when the battery device 100 is in use; the bottom refers to the bottom plate of the battery box 10, i.e., the lowermost plate surface of the battery box 10 when the battery device 100 is in use; and the directions perpendicular to the Y direction are the X direction and the Z direction.

[0126] The pressure strip 13 is fitted onto the outer side of the cover 12 away from the body 11. When the pressure strip 13 is projected onto the body 11 in the first direction, the projection area of ​​the pressure strip 13 at least partially covers the connection area between the body 11 and the cover 12. Through the pressing and limiting effect of the pressure strip 13, the connection and sealing of the cover 12 and the body 11 are compacted and fixed, preventing the edge of the cover 12 from warping and the connection gap from opening, thereby improving the connection sealing and structural stability of the battery box 10.

[0127] In some embodiments, the pressure strip 13 is installed and fixed on the upper end face of the box cover 12, and the pressure strip 13 is arranged around the perimeter of the box cover 12. The pressure strip 13 has a certain width, so that when the pressure strip 13 is projected onto the box body 11 below, its projection range can at least partially cover the connection area between the box cover 12 and the box body 11, so that the clamping force can be applied to the connection position to compact and limit the seal.

[0128] In some embodiments, the pressure strip 13 and the cover 12 can be connected by bolts or by sealant.

[0129] Specifically, the pressure strip 13 includes a first pressure strip 14 and a second pressure strip 15 that cooperate with each other. When the first pressure strip 14 and the second pressure strip 15 are assembled together, at least a portion of the first pressure strip 14 and at least a portion of the second pressure strip 15 overlap and fit together to form an overlapping section 16. Through the overlapping and fitting design of the two pressure strips, the assembly gap of the split pressure strip 13 is eliminated, and the connection area of ​​the battery box 10 is covered and pressed tightly.

[0130] In some embodiments, the first pressure strip 14 may include a first segment 141 and a second segment 143, with the first segment 141 located at the end of the first pressure strip 14. The second pressure strip 15 may include a third segment 151 and a fourth segment 153, with the third segment 151 located at the end of the second pressure strip 15. The first segment 141 and the third segment 151 are stacked to form an overlapping segment 16, which is the connection point between the first pressure strip 14 and the second pressure strip 15.

[0131] In some embodiments, the pressure strip 13 assembly includes a plurality of first pressure strips 14 and a plurality of second pressure strips 15. The plurality of first pressure strips 14 and the plurality of second pressure strips 15 are arranged sequentially along the circumferential edge of the box cover 12 and overlap each other to jointly surround the periphery of the box cover 12, forming a circumferentially continuous pressing and protective structure.

[0132] Specifically, the first pressure strip 14 may include two first segments 141, that is, the two first segments 141 are located at both ends of the first pressure strip 14 respectively, and the second pressure strip 15 may include two third segments 151, that is, the two third segments 151 are located at both ends of the second pressure strip 15 respectively, and the multiple first pressure strips 14 and the multiple second pressure strips 15 are connected end to end in sequence.

[0133] In some embodiments, the length and number of the first pressure strip 14 and the second pressure strip 15 can be adapted and configured according to the perimeter of the outer contour of the box cover 12. At the same time, the single-segment length and number of the first pressure strip 14 and the second pressure strip 15 can be adjusted according to the layout position, corner distribution and overlap layout requirements of each overlapping segment 16, so as to realize segmentation and adaptive arrangement as needed, taking into account both the structural overlap rationality and the assembly process adaptability.

[0134] For example, when the lid 12 is rectangular, two first pressure strips 14 can be arranged along the two long sides of the lid 12, and two second pressure strips 15 can be arranged along the two short sides of the lid 12. An overlapping section 16 can be set at each of the four corners of the rectangle.

[0135] The overlapping section 16 fills the assembly gap at the joint of the first pressure strip 14 and the second pressure strip 15, avoiding any blind spots in the clamping at the joint of the separate pressure strips. This ensures that the entire connection area of ​​the housing is subjected to uniform and continuous clamping force, reducing the possibility of sealing failure or structural loosening caused by insufficient local clamping. At the same time, the overlapping joint structure improves the overall connection integrity of the two pressure strips 13, enhances the overall structural strength of the pressure strips 13, and further improves the clamping and limiting effect on the housing.

[0136] Segmented pressure strips can eliminate accumulated tolerances in manufacturing and assembly, adapt to thermal expansion and contraction deformation, suppress overall resonance and edge warping, and avoid localized false pressure and micro-gaps in the joints. Each segment can adaptively fit the edge of the cover 12, avoiding the problems of localized false pressure and uneven fitting that are prone to occur with integral pressure strips 13. They can adaptively compensate for thermal expansion and contraction deformation under alternating hot and cold temperatures, preventing the pressure strip 13 from arching and detaching from the sealing surface. Under vehicle bumpy and vibrating conditions, they can disperse the overall resonance effect, maintain a constant clamping force at the box joint, and reduce the formation of sealing gaps. Under actual working conditions, they can always maintain a uniform and constant clamping effect on the cover 12, thereby improving the overall sealing reliability of the box.

[0137] Segmented pressure strips allow for independent disassembly and replacement of individual sections without the need for overall disassembly and replacement, reducing maintenance costs and disassembly procedures while ensuring structural sealing, mechanical stability, adaptability to working conditions, and ease of maintenance.

[0138] During assembly, the cover 12 is first precisely fitted onto the opening of the body 11 and pre-fixed. Then, the first pressure strip 14 and the second pressure strip 15 are sequentially laid on the surface of the cover 12, so that the ends of the two pressure strips 13 overlap to form a overlapping section 16. Finally, the pressure strips 13 are fixed to the surface of the cover 12 by bolting, riveting, or gluing. The pressing action of the pressure strips 13 compacts the connection area of ​​the body 11, completing the assembly of the battery box 10. The battery box 10 has a pressure resistance of 24KPa-28KPa.

[0139] In this embodiment, the battery housing 10 may be made of one or more materials. For example, it may include high-strength metallic materials, such as aluminum alloys or steel, to provide good structural strength and stability and ensure the safety of the battery in various environments. It may also include non-metallic materials with excellent insulation properties, such as engineering plastics, to reduce the possibility of safety hazards such as battery leakage. It may also include materials with good thermal conductivity to facilitate heat dissipation during battery operation and maintain the normal operating temperature of the battery.

[0140] In some embodiments, the cover 12 and the body 11 can be sealed and fixed by a sealing element to further enhance the sealing performance of the battery box 10.

[0141] In this embodiment, by covering the opening of the box body 11 with the box cover 12 and setting a pressure strip 13 on the side of the box cover 12 away from the box body 11, the pressure strip 13 is divided into a first pressure strip 14 and a second pressure strip 15 and stacked to form an overlapping section 16. The pressure strip 13 can be used to press and limit the connection between the box cover 12 and the box body 11, and the force is uniform and continuous, which improves the sealing, dustproof and waterproof and vibration resistance structure stability of the battery box 10. Furthermore, the split and splicable structure does not require overall disassembly and replacement. Each pressure strip can be disassembled and maintained separately, and partial replacement is possible. Disassembly and assembly are convenient, maintenance costs are low, and it is convenient for later inspection and replacement of parts.

[0142] Figure 6 This is a top view of the pressure strip according to an embodiment of this application. Figure 7 This is a top view of the box lid according to an embodiment of this application. Figure 6 and Figure 7 As shown, the lid 12 includes an intersecting and connected first edge 121 and a second edge 122, and the orthographic projection of the overlapping segment 16 along the first direction covers the connection between the first edge 121 and the second edge 122.

[0143] In some embodiments, the overlapping segment 16 covers the junction of the first edge 121 and the second edge 122, that is, the first pressure strip 14 and the second pressure strip 15 cover the first edge 121 and the second edge 122.

[0144] The lid 12 can be configured as a polygonal structure, such as a rectangle. The lid 12 has multiple edges, including an intersecting and connected first edge 121 and second edge 122. The first edge 121 and second edge 122 are two adjacent sides on the outer periphery of the lid 12, and the two sides are connected end to end to form a corner of the lid 12.

[0145] In some embodiments, the edge of the lid 12 includes not only the four perimeters of the top surface of the lid 12, but also the lateral elevations of the outer perimeter of the lid 12; that is, the edge of the lid 12 is the enclosed boundary area formed by the four perimeters of the top surface of the lid 12 and the side surface of the outer wall of the lid 12, including both the circumferential edge of the top surface and the perimeter of the vertical side.

[0146] In some embodiments, the connection between the first edge 121 and the second edge 122 may include a corner transition region, that is, the first edge 121 and the second edge 122 are connected by an arc, and the arc region connects the end of the first edge 121 and the end of the second edge 122.

[0147] In some embodiments, the connection between the first edge 121 and the second edge 122 may also be the area where the end of the first edge 121 and the end of the second edge 122 are in direct contact.

[0148] After the corner of the polygonal cover 12 is assembled, it is easy to have poor fit, stress concentration and edge warping. It is a weak point of the battery box 10 with sealing failure and loosening and leakage. Therefore, the overlapping section 16 can be used to optimize the tightening of this weak area.

[0149] The overlapping section 16, projected along the first direction toward the cover 12, covers the connection between the first edge 121 and the second edge 122 of the cover 12. Through the overlapping and pressing structure of the overlapping section 16, double-layer compaction and limiting of the weak corner area of ​​the cover 12 can be achieved, eliminating the blank area and assembly gap between the two pressure strips at the corner joint position. This ensures that the straight edge and corner positions of the polygonal cover 12 can obtain continuous, uniform, and uninterrupted pressing force, improving the problems of easy edge warping, poor sealing, and uneven force at the corner of the polygonal cover 12, and enhancing the sealing performance and structural vibration resistance of the battery box 10 at the corner position.

[0150] The split-type overlapping clamping design, unlike the integral ring-shaped clamping strip, eliminates the need for complete disassembly and replacement. When any clamping strip on one side shows wear, deformation, or aging failure, the first clamping strip 14 or the second clamping strip 15 can be disassembled separately for partial replacement and maintenance without disassembling the entire clamping strip and cover 12. This convenient and efficient disassembly and assembly operation reduces the cost of later inspection, maintenance, and parts replacement for the battery housing 10, and is suitable for the maintenance needs during long-term battery service.

[0151] In some embodiments, the orthographic projection of the overlapping segment 16 toward the lid 12 along the first direction falls within the area of ​​the lid 12, that is, the overlapping segment 16 does not extend outward beyond the edge boundary of the lid 12.

[0152] In some embodiments, the orthographic projection of the first pressure strip 14 and the second pressure strip 15 toward the lid 12 along the first direction falls within the range of the lid 12, that is, the first pressure strip 14 and the second pressure strip 15 do not extend outward beyond the edge boundary of the lid 12.

[0153] In some embodiments, the first pressure strip 14 and the second pressure strip 15 may extend beyond the edge boundary of the box cover 12, which is not limited in this application embodiment.

[0154] In some embodiments, the lid 12 includes a plurality of first edges 121 and a plurality of second edges 122, and the plurality of first edges 121 and the plurality of second edges 122 form a plurality of connection points. The pressure strip 13 includes a plurality of first pressure strips 14 and a plurality of second pressure strips 15, and the plurality of first pressure strips 14 and the plurality of second pressure strips 15 form a plurality of overlapping segments 16, and the plurality of overlapping segments 16 are provided in a one-to-one correspondence with the plurality of connection points.

[0155] In this embodiment, the cover 12 is set as a polygon and includes an adjacent first edge 121 and a second edge 122. The first pressure strip 14 and the second pressure strip 15 form an overlapping section 16 at the connection point on both sides and cover the connection point. The weak corner seal of the polygonal cover 12 is double-compacted and limited, eliminating the corner docking blind zone, avoiding corner warping, loosening and sealing failure, improving the overall vibration resistance and sealing performance of the battery box 10. The split overlapping structure can be disassembled and maintained separately and the pressure strip can be replaced locally. The disassembly and maintenance are convenient and the later operation and maintenance costs are reduced.

[0156] Figure 8 This is another top view of the pressure strip according to an embodiment of this application; Figure 9 This is another top view of the box lid according to an embodiment of this application; Figure 10 This is another top view of the retaining strip according to an embodiment of this application. (See attached image.) Figures 8 to 10 As shown, the lid 12 includes a first edge 121 and a second edge 122. The extension dimension of the first edge 121 is greater than the extension dimension of the second edge 122. The first edge 121 includes a middle section 1211 and an end section 1212. The end section 1212 is located on at least one side of the middle section 1211 along a second direction. The middle section 1211 crosses the centerline of the first edge 121. The orthographic projection of the overlapping section 16 along the first direction is located within the orthographic projection of the end section 1212 along the first direction. The second direction is the extension direction of the first edge 121.

[0157] The second direction is either the X direction or the Z direction. Specifically, the first edge 121 may extend along the X direction and the second edge 122 may extend along the Z direction, or the first edge 121 may extend along the Z direction and the second edge 122 may extend along the X direction.

[0158] The lid 12 includes a first edge 121 and a second edge 122. The extension dimension of the first edge 121 is greater than the extension dimension of the second edge 122, that is, the length of the first edge 121 is greater than the length of the second edge 122.

[0159] In some embodiments, the lid 12 may be a polygonal structure, and the orthographic projection of the first edge 121 and the second edge 122 along the first direction is the two sides of the polygon, that is, the orthographic projection of the first edge 121 along the first direction is the long side of the polygon, and the orthographic projection of the second edge 122 along the first direction is the short side of the polygon.

[0160] In some embodiments, the first edge 121 and the second edge 122 may or may not intersect, and this application embodiment does not limit this.

[0161] The first edge 121 is longer, has a larger span, and a longer suspended extension distance. Under the action of vibration of electrical equipment, temperature changes, and assembly stress, the end of the long side is more likely to undergo elastic deformation and outward warping. This can easily cause the end of the cover 12 to be loosely connected to the opening edge of the box body 11, increasing the gap between the joints and making it a weak point for water ingress, dust ingress, sealing failure, and structural loosening.

[0162] Since the first edge 121 is longer, the structural support stiffness of its middle region is relatively weak. If the clamping force and assembly stress are concentrated too much in the middle of the first edge 121, the stress will accumulate in the middle of the first edge 121, further increasing the load on the middle of the first edge 121, weakening the structural support performance of this region, and thus increasing the risk of deformation and damage in the middle of the first edge 121.

[0163] The first edge 121 includes a middle segment 1211 and an end segment 1212, the end segment 1212 being located on at least one side of the middle segment 1211 along a second direction, the middle segment 1211 being transversely across the centerline of the first edge 121.

[0164] In some embodiments, the first edge 121 includes a middle segment 1211 and a plurality of end segments 1212, the plurality of end segments 1212 being located on at least one side of the middle segment 1211 along a second direction.

[0165] Specifically, the polygonal box cover 12 has multiple sides, wherein the side with a relatively longer length is defined as the first edge 121 and the side with a relatively shorter length is defined as the second edge 122; the first edge 121 is divided into regions based on its own center line, and end segments 1212 are formed on one or both sides of the center line, and the center line region is defined as the middle segment 1211.

[0166] When the overlapping segment 16 is projected in the first direction parallel to the thickness direction of the pressure strip 13, the projection area of ​​the overlapping segment 16 falls within the orthogonal projection of the end segment 1212 in the first direction, thus achieving corresponding coverage of the overlapping segment 16 and the end segment 1212 in the spatial projection position.

[0167] The orthographic projection of the overlapping section 16 is located within the orthographic projection of the end section 1212. The overlapping section 16 can be arranged using the layout space of the long side, so that the segment boundary of the pressure strip 13 avoids the middle section 1211 where the first edge 121 is most stressed. The overlapping section 16 is distributed on one or both sides of the end section 1212 of the middle section 1211, which can limit and fix the end of the first edge 121 which is longer, suppress the warping deformation and gap expansion of the long side end, and reduce the sealing risks caused by the deformation of the long side itself.

[0168] Figure 11 This is another top view of the retaining strip according to an embodiment of this application. (See attached image.) Figure 11As shown, the overlapping section 16 can also be located at the connection between the first edge 121 and the second edge 122, or the overlapping section 16 can cover the end section 1212, the connection between the first edge 121 and the second edge 122, and the second edge 122, forming a continuous transition compression, so that the long side end, the long and short side corner connection and the short side are subjected to uniform force, and the overall sealing of the connection area between the cover 12 and the box body 11 is improved.

[0169] In some embodiments, the overlapping segment 16 may also cover the entire first edge 121.

[0170] In some embodiments, the orthographic projection of the overlapping segment 16 toward the lid 12 along the first direction falls within the area of ​​the lid 12, that is, the overlapping segment 16 does not extend outward beyond the edge boundary of the lid 12.

[0171] In this embodiment, the cover 12 is polygonal and includes a larger first edge 121. The end segment 1212 is arranged on one or both sides of the centerline of the first edge 121, and the orthographic projection of the overlapping segment 16 along the first direction is located within the orthographic projection of the end segment 1212 along the first direction. This can locate the overlapping position of the segmented pressure strip, avoid the stress concentration point of the middle segment 1211 of the first edge 121, distribute the overlapping load of the overlapping segment 16 to the end segment 1212, balance the pressure force distribution of the pressure strip 13 on the long side of the cover 12, reduce stress concentration at the centerline, avoid warping and sealing failure due to excessive local stress, and improve the overall sealing reliability and structural stability of the battery box 10.

[0172] In some embodiments, the ratio of the dimension of the overlapping segment 16 along the second direction to the dimension of the first edge 121 along the second direction is k1, and the value of k1 is in the range of 1 / 12≤k1≤1 / 3.

[0173] The extension direction of the first edge 121 is the second direction, and the parameters are defined using the second direction as the dimensional reference. The ratio between the extension length of the overlapping segment 16 along the second direction and the overall length of the first edge 121 along its own extension direction is set to k1, and the ratio k1 is within the range of 1 / 12≤k1≤1 / 3.

[0174] The dimension of the overlapping segment 16 in the second direction refers to the actual length covered by the overlapping segment 16 along the length extension path of the first edge 121; the dimension of the first edge 121 is the total length of the first edge 121 along its own extension direction, and the two are proportionally calibrated to form a ratio k1.

[0175] If k1 is less than 1 / 12, the overlap length of the overlapping section 16 along the second direction is too short and the coverage area is extremely small. The overlap of the first pressure strip 14 and the second pressure strip 15 at the end of the first edge 121 is insufficient. The overall integrity of the connection between the two pressure strips 13 is poor and the positioning reliability is weak. It is difficult to suppress the warping and loosening of the joint between the area of ​​the first edge 121 and the box part 11.

[0176] If k1 is greater than 1 / 3, the overlapping coverage area of ​​the overlapping segment 16 along the second direction is too long, and a large amount of pressing force and assembly stress are excessively concentrated in the middle of the first edge 121, resulting in material redundancy and unreasonable structural layout of the pressure strip 13. This causes stress to be transmitted and diffused in the opposite direction to the middle of the first edge 121, increasing the load-bearing capacity of the middle of the first edge 121, affecting the support force of the middle of the first edge 121, and increasing the risk of damage to the middle area of ​​the first edge 121.

[0177] When k1 is controlled within the range of 1 / 12 to 1 / 3, the overlapping section 16 has a moderate overlap length along the second direction, which allows the first pressure strip 14 and the second pressure strip 15 to form an overlapping fit at the first edge 121, achieving continuous sealing and smooth transition of force, reducing the impact on the central area of ​​the first edge 121, distributing, buffering and reducing the bearing pressure and stress load of the central area of ​​the first edge 121, keeping the central area of ​​the first edge 121 in a safe working state of low stress and low load, and avoiding deformation, collapse or structural damage to the central area of ​​the first edge 121 due to long-term overload pressure and stress concentration.

[0178] In this embodiment, the ratio of the dimension of the overlapping section 16 extending along the first edge 121 to the overall length of the first edge 121 is limited to 1 / 12 to 1 / 3, so that the first pressure strip 14 and the second pressure strip 15 can reliably overlap, improving the sealing performance of the battery box 10, avoiding insufficient overlap strength and stress concentration due to the overlapping section 16 being too short, and preventing material redundancy and stress transfer to the middle of the first edge 121 due to the overlapping section 16 being too long, reducing the load and stress level in the middle of the first edge 121, avoiding deformation and cracking damage due to excessive load in the middle, and taking into account both assembly reliability and stress optimization.

[0179] The dimension S1 of the overlapping segment 16 along the second direction is in the range of 30mm≤S1≤90mm.

[0180] When S1 is less than 30mm, the overlap length of the overlapping section 16 along the extension direction of the first edge 121 is too short, the overlap area of ​​the first pressure strip 14 and the second pressure strip 15 is insufficient, and the overlap stability between the pressure strips is poor.

[0181] When S1 is greater than 90mm, the overlap length of the overlapping section 16 along the second direction is too large, which will excessively occupy the arrangement space of the first edge 121, resulting in waste of pressure strip material and structural redundancy, which is not conducive to the lightweight layout of the battery box 10. At the same time, the excessively long overlapping section 16 will cause the end clamping load and assembly stress to be excessively diffused, transmitted and superimposed to the middle of the first edge 121, increasing the load on the middle of the first edge 121, and it is also easy to cause layout interference with other components around the battery box 10, resulting in poor assembly compatibility.

[0182] By controlling the dimension S1 of the overlapping section 16 along the second direction within the range of 30mm to 90mm, sufficient overlap length between the first pressure strip 14 and the second pressure strip 15 can be ensured, resulting in a stable connection and continuous, uniform compression, thereby improving the sealing performance and vibration resistance of the battery box 10. Furthermore, the extension length of the overlapping section 16 can be controlled to prevent insufficient connection strength and compression effect due to an excessively short overlap, and to avoid stress transfer and material redundancy due to an excessively long overlap. This diverts and reduces the load-bearing stress in the middle of the first edge 121, preventing bending, denting, or cracking damage caused by long-term high load in the middle.

[0183] In some embodiments, the dimension S1 of the overlapping segment 16 along the second direction can be 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, or 90mm.

[0184] In this embodiment, the dimension S1 of the overlapping section 16 extending along the first edge 121 is limited to the range of 30mm to 90mm. This satisfies the overlap length of the first pressure strip 14 and the second pressure strip 15, ensuring a stable and reliable connection and improving the sealing performance of the battery box 10. It also avoids insufficient overlap strength and stress concentration caused by an excessively small overlapping section 16, while reducing the possibility of material redundancy and stress transfer to the center of the first edge 121 due to an excessively large size. This reduces the load and stress level in the center of the first edge 121, and decreases the possibility of deformation, cracking, and damage caused by excessive load in the center.

[0185] Figure 12 This is another top view of the pressure strip according to an embodiment of this application; Figure 13 This is another top view of the retaining strip according to an embodiment of this application. Figure 12 and Figure 13 As shown, the first pressure strip 14 includes a plurality of first mounting holes 142, the second pressure strip 15 includes a plurality of second mounting holes 152, the cover 12 includes a plurality of third mounting holes 123, and the battery box also includes a first fixing member 171 and a second fixing member 172. The first fixing member 171 passes through the corresponding first mounting hole 142 and the third mounting hole 123, and the second fixing member 172 passes through the corresponding second mounting hole 152 and the third mounting hole 123.

[0186] In some embodiments, the first fastener 171 passes through the corresponding first mounting hole 142 and the third mounting hole 123 to fix the portion of the first pressure strip 14 other than the overlapping section 16 to the box cover 12, and the second fastener 172 passes through the corresponding second mounting hole 152 and the third mounting hole 123 to fix the portion of the second pressure strip 15 other than the overlapping section 16 to the box cover 12.

[0187] In some embodiments, the battery housing may further include a third fastener 173, which passes through the corresponding first mounting hole 142, second mounting hole 152 and third mounting hole 123 to fix the overlapping section 16 to the housing cover 12.

[0188] It should be understood that the third fastener 173 can be either the first fastener 171 or the second fastener 172.

[0189] The first pressure strip 14 has multiple first mounting holes 142 spaced apart along its own length or extension direction, and the second pressure strip 15 has multiple second mounting holes 152 spaced apart along its own length or extension direction. The cover 12 has multiple third mounting holes 123 at the assembly positions of the first pressure strip 14 and the second pressure strip 15. The first mounting holes 142 of the first pressure strip 14 located in the overlapping section 16 area correspond one-to-one with the second mounting holes 152 of the second pressure strip 15 located in the overlapping section 16 area, and are coaxially aligned. At the same time, all the first mounting holes 142 can be matched and aligned one-to-one with the third mounting holes 123 of the cover 12, and all the second mounting holes 152 can also be matched and aligned one-to-one with the third mounting holes 123 of the cover 12.

[0190] The battery housing 10 is also equipped with multiple fasteners, including multiple first fasteners 171, multiple second fasteners 172, and multiple third fasteners 173, for detachable locking assembly between the first pressure strip 14, the second pressure strip 15, and the housing cover 12. During assembly, the first mounting hole 142 located in the area of ​​the first pressure strip 14 excluding the overlapping section 16 aligns with the corresponding third mounting hole 123 of the housing cover 12. The first fasteners 171 are sequentially inserted into the corresponding first mounting holes 142 and third mounting holes 123, thereby fixing the remaining part of the first pressure strip 14 excluding the overlapping section 16 to the surface of the housing cover 12. Similarly, the second mounting hole 152 located in the area of ​​the second pressure strip 15 excluding the overlapping section 16 aligns with the corresponding third mounting hole 123 of the housing cover 12. The second fasteners 172 are sequentially inserted into the corresponding second mounting holes 152 and third mounting holes 123, thereby fixing the remaining part of the second pressure strip 15 excluding the overlapping section 16 to the surface of the housing cover 12.

[0191] At the overlapping section 16 formed by the overlapping of the first pressure strip 14 and the second pressure strip 15, the first mounting hole 142, the second mounting hole 152, and the third mounting hole 123 of the cover 12 are coaxially aligned. The third fastener 173 passes through the matching first mounting hole 142, second mounting hole 152, and third mounting hole 123. The same fastener simultaneously locks the three-layer structure of the first pressure strip 14, the second pressure strip 15, and the cover 12, thereby fixing the overlapping section 16 to the cover 12.

[0192] At the overlapping section 16, a single fixing piece is used to coaxially penetrate three layers of holes for locking. This allows the first pressure strip 14 and the second pressure strip 15 to connect in the overlapping area, improving the connection rigidity and structural integrity at the overlapping section 16. This suppresses the misalignment, slippage, and loosening of the pressure strip under vehicle bumps and working vibrations, ensuring that the overlapping section 16 always stably covers the side connection area of ​​the box cover 12. The overall hole arrangement is regular, the structure is simple, the processing and forming are convenient, and the locking force is uniform. This not only improves the assembly firmness and vibration resistance reliability of the pressure strip and the box cover 12, but also takes into account the convenience of disassembly and assembly and the applicability for mass production.

[0193] In this embodiment, by providing a first mounting hole 142 and a second mounting hole 152 on the first pressure strip 14 and the second pressure strip 15 respectively, and providing a corresponding third mounting hole 123 on the cover 12, and using the first fixing member 171 and the second fixing member 172 to fix the first pressure strip 14 and the second pressure strip 15, it is possible to quickly align the two pressure strips with the cover 12, install them conveniently, and position them reliably. Furthermore, the pressure strips can be disassembled and maintained separately, and partial replacement can be performed, making maintenance convenient.

[0194] Figure 14 This is a schematic diagram of the retaining strip according to an embodiment of this application. Figure 13 and Figure 14 As shown, the first pressure strip 14 includes a first segment 141 and a second segment 143, and the second pressure strip 15 includes a third segment 151 and a fourth segment 153. The first segment 141 and the third segment 151 are stacked to form an overlapping segment 16. The ratio of the distance between the centers of two adjacent first mounting holes 142 of the first segment 141 to the distance between the centers of two adjacent first mounting holes 142 of the second segment 143 is k2, and the value of k2 is in the range of 0.5≤k2≤1; and / or the ratio of the distance between the centers of two adjacent second mounting holes 152 of the third segment 151 to the distance between the centers of two adjacent second mounting holes 152 of the fourth segment 153 is k3, and the value of k3 is in the range of 0.5≤k3≤1.

[0195] The ratio of the center-to-center distance between two adjacent first mounting holes 142 in the first segment 141 of the first pressure strip 14 to the center-to-center distance between two adjacent first mounting holes 142 in the remaining areas of the first pressure strip 14 excluding the first segment 141, i.e., the second segment 143, is k2. The value range of this proportionality coefficient k2 is 0.5≤k2≤1. The ratio of the center-to-center distance between two adjacent second mounting holes 152 in the third segment 151 of the second pressure strip 15 to the center-to-center distance between two adjacent second mounting holes 152 in the remaining areas of the second pressure strip 15 excluding the third segment 151, i.e., the fourth segment 153, is k3. The value range of this proportionality coefficient k3 is 0.5≤k3≤1.

[0196] In some embodiments, k2 may be defined separately, k3 may be defined separately, or both k2 and k3 may be defined simultaneously.

[0197] The first segment 141 and the third segment 151 overlap to form the overlapping segment 16. The overlapping segment 16 is the connection position where the first pressure strip 14 and the second pressure strip 15 overlap and connect. Compared with the other areas of the pressure strip 13, it has higher requirements for the density of the mounting holes, the distribution of locking points, and the uniformity of force.

[0198] When k2 or k3 is less than 0.5, it means that the hole spacing of the mounting holes in the first section 141 and the third section 151 is much smaller than the conventional hole spacing of the pressure strip 13 body. The hole arrangement is too dense. Too many holes will significantly weaken the cross-sectional structural strength of the pressure strip 13 itself. Stress concentration is easily formed around the hole positions. Under long-term alternating load, cracks, extension, or even fracture failure are likely to occur. At the same time, too many holes will increase the stamping process, increase manufacturing costs, make the number of fasteners redundant, make the assembly process cumbersome, and easily interfere with the surrounding structure, which is not conducive to assembly.

[0199] When k2 or k3 is greater than 1, the hole spacing of the mounting holes in the first section 141 and the third section 151 is greater than the conventional hole spacing in the body area of ​​the pressure strip 13. The mounting holes in the overlapping section 16 are too sparse, the number of locking support points is too small, and the constraint and locking force on the corner overlapping section 16 is insufficient, which cannot form a continuous and uniform pressing and fixing effect. Under continuous vibration, temperature change and assembly stress, problems such as increased local fitting gap in the overlapping section 16, warping of the corners of the pressure strip 13, misalignment and slippage, and loosening of the connection are likely to occur, which will lead to the failure of the box seal.

[0200] In some embodiments, the ratio of the distance between the centers of two adjacent first mounting holes 142 of the first segment 141 to the distance between the centers of two adjacent first mounting holes 142 of the second segment 143 is k2, and the value of k2 can be 0.5, 0.6, 0.7, 0.8, 0.9, or 1.

[0201] In some embodiments, the ratio of the distance between the centers of two adjacent second mounting holes 152 of the third segment 151 to the distance between the centers of two adjacent second mounting holes 152 of the fourth segment 153 is k3, and the value of k3 can be 0.5, 0.6, 0.7, 0.8, 0.9, or 1.

[0202] In this embodiment, k2 and k3 are strictly limited to a value range of 0.5 to 1, so that the hole spacing of the mounting holes at the first segment 141 and the third segment 151 is less than or equal to the hole spacing of the mounting holes in the respective body areas of the pressure strip 13. This achieves a denser arrangement of mounting holes at the overlapping segment 16 and a moderate increase in locking points, enabling multi-point uniform locking of the overlapping area of ​​the pressure strip 13 and the corner connection area of ​​the cover 12. The denser hole arrangement can distribute the concentrated load to each mounting and fixing point, avoiding local stress concentration, and ensuring a tight connection between the pressure strip 13 and the cover 12, and between the cover 12 and the box body 11, suppressing warping, loosening, and gap expansion. This ratio range balances the hole density and the structural strength of the pressure strip 13, making the layout of fixing points, force transmission, and assembly reliability of the overlapping segment 16 and the non-overlapping segment matched.

[0203] Continue to refer to Figure 13 and Figure 14 The distance S2 between the centers of two adjacent first mounting holes 142 in the first segment 141 is in the range of 15mm≤S2≤90mm; and / or the distance S3 between the centers of two adjacent second mounting holes 152 in the third segment 151 is in the range of 15mm≤S3≤90mm.

[0204] The overlapping section 16, as the area where the first pressure strip 14 and the second pressure strip 15 are double-layered and coaxially locked in a three-layer structure, is a weak area in the battery box 10 structure that is prone to stress concentration, vibration fatigue, and loosening of the fit. This area not only needs to bear the sealing and pressing load of the joint between the box cover 12 and the box body 11, but also continuously bears torsional loads, shear loads, and peeling loads under complex working conditions such as vehicle bumps, acceleration and deceleration, road impacts, and alternating hot and cold temperatures. Therefore, the spacing of the mounting holes inside the overlapping section 16 needs to balance structural strength, locking stiffness, stress uniformity, and sealing stability.

[0205] If the value of S2 is less than 15mm and / or the value of S3 is less than 15mm, the spacing between adjacent first mounting holes 142 in the first segment 141 is too small, and the hole arrangement is too dense; the spacing between adjacent second mounting holes 152 in the third segment 151 is too small, and the hole arrangement is too dense. The overlapping segment 16 itself is a double-layer pressure strip stacked structure, and the local thickness and assembly stress are greater. Dense openings will weaken the base cross-sectional area of ​​the first pressure strip 14 and the second pressure strip 15, destroy the structural integrity of the pressure strip, and cause multiple stress concentration points to form at the edge of the hole. Under long-term alternating vibration load, structural failure problems such as hole cracking, pressure strip deformation, and local fracture are very likely to occur, reducing the service life and structural reliability of the pressure strip.

[0206] Too small a hole spacing will lead to an overly crowded hole layout, which will easily cause process defects such as hole position misalignment, edge chipping, and poor forming accuracy during processing, increasing the scrap rate. At the same time, too many fasteners will cause material redundancy, complicated assembly process, increase production costs and assembly time, and the dense fastener heads are prone to spatial interference with the surrounding box structure and sealing structure, affecting the overall assembly adaptability and structural flatness.

[0207] If the value of S2 is greater than 90mm and / or the value of S3 is greater than 90mm, the spacing of the first mounting holes 142 inside the first segment 141 is too large, and the hole layout is too sparse; the spacing of the second mounting holes 152 inside the third segment 151 is too large, and the hole layout is too sparse. Because the corner area of ​​the overlapping segment 16 is itself subject to concentrated stress and difficult sealing, the sparse locking points will lead to insufficient fixed support points in this area. Large areas of unsupported suspended sections will appear in the overlapping area of ​​the pressure strip. Under continuous vibration and stress, problems such as slippage, warping, and loosening of the pressure strip edges are very likely to occur, which will damage the continuity of the seal.

[0208] Excessive hole spacing will cause the concentrated load at the corner to be unable to be distributed and channeled to multiple points. The load will be concentrated on a few locking points for a long time, which will easily lead to problems such as loose fasteners, disengagement, and overload damage, and will exacerbate the loosening of the battery box 10 structure and the degradation of its vibration resistance.

[0209] By controlling the spacing S2 between two adjacent first mounting holes 142 in the overlapping section 16 to be within the range of 15mm to 90mm, and / or the spacing S3 between two adjacent second mounting holes 152 to be within the range of 15mm to 90mm, this size range allows the mounting holes of the overlapping section 16 to form a moderately spaced layout. Without compromising the structural strength of the first pressure strip 14 or the second pressure strip 15 and without causing stress concentration, multi-point uniform locking of the overlapping area is achieved, improving the connection stiffness, torsional strength, and vibration fatigue resistance of the overlapping section 16, and constraining pressure strip misalignment, warping, and loosening. Uniform locking points can evenly distribute the concentrated load at the corner position to each fixed point, achieving a smooth transition of stress gradient.

[0210] In some embodiments, the distance S2 between the centers of two adjacent first mounting holes 142 in the first segment 141 can be 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, or 90mm.

[0211] In some embodiments, the distance S3 between the centers of two adjacent second mounting holes 152 in the third segment 151 can be 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, or 90mm.

[0212] In this embodiment, the adjacent spacing S2 of the first mounting hole 142 is limited to the range of 15mm to 90mm, and / or the adjacent spacing S3 of the second mounting hole 152 is limited to the range of 15mm to 90mm. This avoids the problems of excessively dense mounting hole arrangement caused by excessively small hole spacing, weakening the structural strength of the pressure strip 13 substrate, and causing stress concentration, processing redundancy, and assembly interference. It also reduces the possibility of sparse locking points and insufficient constraint force caused by excessively large hole spacing, resulting in warping and slippage of the pressure strip 13 corners, sealing failure, and concentrated overload. This allows the mounting holes of the overlapping section 16 to maintain a reasonable and moderate layout density, forming multi-point uniform locking of the overlapping section 16 and the weak area of ​​the box corner, thereby improving the connection stiffness and vibration and torsional resistance of the overlapping section 16.

[0213] Figure 15 This is another structural diagram of the battery device according to an embodiment of this application; Figure 16 This is a partial structural diagram of the battery device according to an embodiment of this application; Figure 17 This is another partial structural diagram of the battery device according to an embodiment of this application. Figures 15 to 17 As shown, the overlapping section 16 includes the first segment 141 of the first pressure strip 14 and the third segment 151 of the second pressure strip 15; the thickness of the overlapping section 16 is equal to the thickness of the remaining portion of the first pressure strip 14 except for the first segment 141; and / or the thickness of the overlapping section 16 is equal to the thickness of the remaining portion of the second pressure strip 15 except for the third segment 151.

[0214] In this embodiment, the thickness of the overlapping segment 16 is designed to be equalized and matched, and the thickness of the overlapping segment 16 is set to be equal to the thickness of the remaining parts of the first pressure strip 14 except for the first segment 141; or the overall thickness of the overlapping segment 16 after stacking is set to be equal to the thickness of the remaining parts of the second pressure strip 15 except for the third segment 151, or the thickness of the remaining parts of the first pressure strip 14 except for the first segment 141 is equal to the thickness of the remaining parts of the second pressure strip 15 except for the third segment 151, and both are equal to the thickness of the overlapping segment 16.

[0215] The first pressure strip 14 includes a first section 141 and the remaining parts excluding the first section 141, and the two parts have different thicknesses; the second pressure strip 15 includes a third section 151 and the remaining parts excluding the third section 151, and the two parts have different thicknesses.

[0216] In some embodiments, the thickness of the first segment 141 and the thickness of the third segment 151 may be the same or different. For example, the thickness of the first segment 141 is 2 mm, the thickness of the third segment 151 is 4 mm, and the thickness of the overlapping segment 16 is 6 mm; or the thickness of the first segment 141 is 3 mm, the thickness of the third segment 151 is 3 mm, and the thickness of the overlapping segment 16 is 6 mm.

[0217] In this embodiment, the thickness of the overlapping section 16 is set to be equal to the thickness of the non-overlapping areas of the first pressure strip 14 and the second pressure strip 15. This ensures that the overall outer surface of the pressure strip 13 is flat and continuous without any steps, resulting in a smooth and regular transition after assembly. This avoids differences in assembly height and eliminates the risk of interference from local protrusions. It also ensures that the fasteners are evenly stressed and the clamping force is evenly distributed when they are locked. The equal thickness structure ensures that the pressure strip 13 has consistent overall stiffness and uniform mechanical properties. This avoids stress concentration caused by sudden changes in local stiffness due to differences in thickness, improves the overall vibration resistance and deformation resistance of the pressure strip 13, and maintains the stable sealing performance of the housing.

[0218] In some embodiments, the thickness h of the overlapping segment 16 is in the range of 1 mm ≤ h ≤ 8 mm.

[0219] The overlapping section 16, as the junction of the two pressure strips, has a thickness that affects its own structural rigidity, bending and torsional resistance, load-bearing limit, clamping and limiting effect, and surface assembly flatness. It also affects the overall layout space occupation, lightweight level, sheet metal stamping processability, and structural fatigue reliability under long-term vibration conditions. Therefore, it is necessary to constrain its thickness within a reasonable range.

[0220] When the thickness h of the overlapping section 16 is less than 1mm, the plate thickness is too thin, the section modulus is too small, and the structural stiffness and load-bearing strength are insufficient. Under the combined action of the pre-tightening pressure generated by the fastener locking, the assembly stress of the battery box 10, and the continuous bumps, alternating vibrations, and shear torsional loads during vehicle operation, the overlapping section 16 is prone to irreversible deformation such as elastic indentation, plastic bending, and corner warping. It cannot maintain a tight fit with the surface of the box cover 12 and it is difficult to form a pressing constraint on the corner connection area of ​​the box.

[0221] Thin sheet metal is prone to defects such as warping, edge chipping, hole collapse, and excessive springback during stamping, cutting, drilling, and bending. This makes it difficult to guarantee the dimensional accuracy of parts, resulting in a low yield rate and hindering large-scale processing and assembly interchangeability.

[0222] When the thickness h of the overlapping section 16 is greater than 8mm, the plate thickness is too large, which will increase the material consumption and overall weight of the pressure strip 13, which is not conducive to the realization of the lightweight and compact design requirements of the battery box 10, and increases the overall weight and manufacturing cost.

[0223] Excessive thickness will result in excessive rigidity of the overlapping section 16, making it difficult to release stress smoothly under load. This can easily lead to localized stress concentration around the holes and at the overlapping edges, which can cause fatigue cracks or even fracture failure under long-term alternating vibration loads. At the same time, excessive thickness will also increase the torque requirement for fastening the fasteners, which can easily lead to over-tightening and uneven stress distribution, thus affecting the uniformity of the fit between the pressure strip 13 and the cover 12 and the assembly stability.

[0224] In some embodiments, the thickness h of the overlapping segment 16 can be 4 mm.

[0225] In some embodiments, the thickness h of the overlapping segment 16 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm.

[0226] In this embodiment, the thickness h of the overlapping section 16 is limited to the range of 1mm to 8mm. This thickness range enables the overlapping section 16 to have moderate and sufficient structural rigidity, bending and torsional strength and load-bearing capacity, and can resist the effects of assembly preload, vibration impact and torsional shear load. It is not easy to bend, dent or warp deformation, and always maintains a flat and tight fit with the surface of the cover 12 to meet the sealing requirements. The moderate thickness value can control the weight of the pressure strip 13 material, meet the requirements of lightweight and compact layout of battery box 10, and avoid material redundancy and space interference problems.

[0227] In some embodiments, the overlapping segment 16 includes a first segment 141 of the first pressure strip 14 and a third segment 151 of the second pressure strip 15; the thickness of the first segment 141 is equal to the thickness of the remaining portion of the first pressure strip 14 excluding the first segment 141; and / or the thickness of the third segment 151 is equal to the thickness of the remaining portion of the second pressure strip 15 excluding the third segment 151.

[0228] The first pressure strip 14 and the second pressure strip 15 are designed with equal thickness throughout. Specifically, the thickness of the first section 141 of the first pressure strip 14 used for overlapping is equal to the thickness of the other body areas of the first pressure strip 14 excluding the first section 141; the thickness of the third section 151 of the second pressure strip 15 used for overlapping with the first section 141 is equal to the thickness of the other body areas of the second pressure strip 15 excluding the third section 151.

[0229] The first pressure strip 14 is a single, elongated structure. The first segment 141 is located at the end of the first pressure strip 14 and overlaps with the third segment 151 of the second pressure strip 15 to form an overlapping segment 16. The thickness of the first segment 141 is the same as the thickness of the rest of the first pressure strip 14 except for the first segment 141. The entire first pressure strip 14 has no local thickening or thinning along its length, and its cross-sectional thickness is uniform and continuous, without any abrupt changes in thickness. Similarly, the third segment 151 of the second pressure strip 15 is the end overlap section of the second pressure strip 15, and its thickness is the same as the thickness of the rest of the second pressure strip 15 except for the third segment 151. The entire second pressure strip 15 also has a uniform thickness and cross-section.

[0230] If the thickness of the first section 141 is not equal to the thickness of the rest of the first pressure strip 14, or if the thickness of the third section 151 differs from the thickness of the rest of the second pressure strip 15, the surface flatness of the pressure strip 13 will be damaged, resulting in local bulges or depressions at the overlapping position after assembly, and poor appearance regularity.

[0231] Inconsistent thickness can cause abrupt changes in the structural stiffness and bending strength of the pressure strip 13. Stress concentration sources are formed at the thickness transition points. Under the long-term working conditions of fastener locking preload, assembly extrusion stress, vehicle driving bumps, alternating vibration, torsional shear impact, etc., stress will continue to accumulate at the thickness change points, which can easily cause local warping, plastic deformation, fatigue cracks or even fracture failure of the pressure strip 13, reducing the service life and structural reliability of the pressure strip 13.

[0232] The uneven thickness of the first pressure strip 14 and the second pressure strip 15 can cause discontinuity in the overall force transmission path. When the fasteners are tightened, the pressure and sinking of different sections are inconsistent, which can easily lead to local over-tightening and local loose fit. This results in uneven distribution of the gap between the pressure strip 13 and the surface of the box cover 12, which in turn leads to an imbalance of sealing pressure at the sides and corner joints of the box, resulting in potential hazards such as poor sealing, water and dust ingress, and reduced moisture and dust protection performance.

[0233] The uniform thickness structure facilitates the integral stamping of the first pressure strip 14 and the second pressure strip 15, eliminating the need for separate thinning and thickening of the overlapping section. This simplifies the production process, reduces processing difficulty and manufacturing costs, ensures good consistency and interchangeability of parts, and facilitates smoother assembly and alignment. It also provides a structural foundation for the subsequent flush arrangement of the overlapping section 16, uniform load bearing, and reduced load on the middle of the first side.

[0234] In this embodiment, the first segment 141 and the remaining part of the first pressure strip 14 are of equal thickness, and the third segment 151 and the remaining part of the second pressure strip 15 are of equal thickness, so that the thickness of a single pressure strip is uniform, the surface transition is smooth and flat, and there are no steps or unevenness. This makes the overall mechanical properties of the pressure strip 13 uniform and stable, avoids stress concentration caused by sudden changes in thickness, and also allows the pressure strip 13 to fit snugly with the box cover 12 after assembly, with balanced force, and there will be no problem of local false pressure or overpressure.

[0235] Figure 18 This is another structural diagram of the battery housing according to an embodiment of this application; Figure 19 This is a partial structural diagram of the battery housing according to an embodiment of this application. Figure 18 and Figure 19 As shown, the first pressure strip 14 and / or the second pressure strip 15 include an extension 131 that extends along a first direction and covers at least a portion of the outer surface of the side wall of the housing portion 11; wherein the side wall of the housing portion 11 is parallel to the first direction.

[0236] The first pressure strip 14 and the second pressure strip 15 are arranged along the edge of the box cover 12 to press, limit and seal the joint between the box cover 12 and the box body 11. On this basis, the pressure strip 13 bends downward to extend a section 131, which is arranged at a perpendicular angle to the plane of the box cover 12. The extension section 131 extends along a first direction perpendicular to the box cover 12, extending vertically downward from the side of the box cover 12, and is attached to and covers at least part of the outer side wall area of ​​the box body 11, that is, at least part of the outer surface of the side wall, forming a protective structure that spans from the edge of the box cover 12 to the side wall of the box body 11.

[0237] It should be understood that the sidewall is perpendicular to the lid 12.

[0238] In some embodiments, only the first pressure strip 14 may be provided with an extension section 131, only the second pressure strip 15 may be provided with an extension section 131, or both the first pressure strip 14 and the second pressure strip 15 may be provided with an extension section 131.

[0239] The extension section 131 extends downward along the first direction from the side of the lid 12, vertically crossing the joint between the lid 12 and the body 11, and finally covers and adheres to the outer surface of the side wall of the body 11, so that the extension section 131 extends from the top outer side of the lid 12 to the outside of the side wall of the body 11, covering the outer area of ​​the joint between the lid 12 and the body 11 and part of the side wall area of ​​the body 11.

[0240] The extension section 131 has a vertically elongated strip structure, with its surface perpendicular to the surface of the lid 12. The vertical extension height of the extension section 131 can be matched with the upper assembly height of the side wall of the box body 11, so that it covers the joint between the lid 12 and the box body 11, achieving an outer covering layout at the joint.

[0241] In some embodiments, the extension section 131 and the pressure strip 13 located on the top surface of the box cover 12 are an integral structure. They are formed, assembled and fixed simultaneously. In the assembled state, the extension section 131 is locked and positioned on the edge of the box cover 12 together with the main body of the pressure strip 13, so that the extension section 131 always maintains a fixed relative position with the side wall of the box after assembly, and will not shift, warp or loosen.

[0242] The integrated structure has continuous stiffness without abrupt changes, smooth force transmission, and no local stress concentration. It can adapt to harsh working conditions such as complex vehicle vibration and temperature fluctuations for a long time, and has excellent structural stability and durability.

[0243] In this embodiment, the first pressure strip 14 and / or the second pressure strip 15 are provided to extend along a first direction perpendicular to the cover 12 and cover the extension section 131 of the box body 11. This can form a lateral limiting constraint and physical protection on the outer surface of the side wall of the box body 11, limit the horizontal offset and torsional deformation of the cover 12 and the box body 11, suppress the opening of the joint at the connection, enhance the overall assembly rigidity and structural integrity, and have multiple functions of limiting protection and load optimization.

[0244] Continue to refer to Figure 19 The dimension S4 of the extension segment 131 along the first direction is in the range of 1mm≤S4≤4mm.

[0245] The extension segment 131 extends vertically downward along the first direction, and S4 is the vertical extension dimension of the extension segment 131, which is 1mm ≤ S4 ≤ 4mm. The extension segment 131 serves as a protective and limiting structure that bends downward from the first pressure strip 14 and / or the second pressure strip 15 and covers the outside of the box body 11. Its height dimension along the first direction is the coverage area of ​​the joint between the box cover 12 and the box body 11 and the side wall protection area.

[0246] If S4 is less than 1mm, that is, the vertical height of the extension section 131 along the first direction is too small and the downward extension distance is insufficient, making it difficult to completely cover the outer area of ​​the joint, and the shielding and protection effect on the gap of the box is weak; at the same time, the vertical amplitude of the extension section 131 is too small, which cannot form an effective lateral constraint on the box body 11, reducing the ability to suppress the lateral displacement and torsional misalignment of the box body 11, and the short extension section 131 has too small a structural volume after bending and forming, and its own rigidity is too weak, making it easy to deform under slight external force.

[0247] If S4 is greater than 4mm, that is, the vertical height of the extension section 131 along the first direction is too large and the downward extension distance is too long. Although the blocking and limiting effect is enhanced, it will cause the extension section 131 to protrude too much, occupy more installation space on the outside of the box, and easily interfere with the position of the surrounding wiring harness, mounting bracket and body structural parts, which is not conducive to the compact layout of the battery box 10.

[0248] In some embodiments, the dimension S4 of the extension segment 131 along the first direction can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm.

[0249] An excessively large vertical dimension will increase the stress area of ​​the extension section 131 exposed to wind and impacts. Under the impact of sand and gravel from vehicles and the action of lateral external forces, the bending position at the root of the extension section 131 is prone to excessive bending moment, which will cause stress concentration. Under long-term alternating loads, it is easy to cause problems such as bending fatigue, deformation or even cracking.

[0250] In this embodiment, the dimension S4 of the extension segment 131 along the first direction is limited to the range of 1mm to 4mm. This allows the extension segment 131 to have a reasonable and moderate vertical extension height, which enables the extension segment 131 to extend downward and cover the outside of the joint between the box body 11 and the box cover 12, thus achieving the functions of shielding the joint, preventing dust and water, and providing external protection. At the same time, it forms a moderate lateral limiting constraint on the side wall of the box body 11. Furthermore, it controls the vertical protrusion of the extension segment 131, reducing the possibility of spatial interference caused by excessive size and stress concentration at the root caused by excessive bending moment.

[0251] In some embodiments, the extension 131 is connected to the side wall of the housing portion 11 by sealant.

[0252] A sealant is continuously applied and cured between the inner wall of the extension section 131 and the side wall of the housing section 11. The sealant is evenly filled in the assembly gap between the extension section 131 and the housing section 11, so that the extension section 131 and the side wall of the housing section 11 form a surface-to-surface adhesive structure.

[0253] The sealant fills and seals the gaps between the extension section 131 and the mating surface of the box body 11 caused by machining tolerances and assembly fit, forming a sealant layer. This sealant layer can block and isolate the box body 11 joint from the outside, preventing external rainwater, water vapor, dust, mud and sand and corrosive media from entering the box body from the side gaps, thereby improving the waterproof, dustproof, moisture-proof and corrosion-proof protection capabilities of the side of the battery box body 10.

[0254] In some embodiments, the sealant, after curing, has an adhesive and fixing function, which can bond and position the extension section 131 on the outer wall of the housing part 11, constrain the extension section 131 from shaking, warping, shifting and loosening relative to the housing part 11, enhance the overall assembly integrity and structural stability between the extension section 131 and the housing part 11, and make the extension section 131 form a structure that vertically covers and laterally limits the housing part 11.

[0255] The sealant has good elasticity and cushioning properties, which can adapt to the bumps and vibrations during vehicle operation, as well as the slight deformation and relative displacement caused by temperature changes. The rigid contact between the buffer extension 131 and the side wall of the housing 11 avoids abnormal noise, bumps and wear, and local stress concentration caused by hard metal collisions.

[0256] The sealant can adaptively compensate for dimensional deviations caused by parts processing and assembly, so that the extension section 131 fits snugly with the housing section 11. It can achieve multiple functions such as connection, sealing, buffering and limiting without the need for additional fasteners. The structure is simple, the assembly is convenient, and the molding consistency is good.

[0257] In this embodiment, the extension section 131 and the housing section 11 are bonded together with sealant. This not only fills and seals the gap between the two, forming a continuous and sealed protective barrier, preventing external moisture, dust and corrosive media from penetrating into the housing, thus improving the overall waterproof, dustproof and corrosion-resistant performance; it also bonds and positions the extension section 131 on the side wall of the housing section 11, restraining its shaking, displacement, warping and loosening, enhancing the overall assembly integrity and structural stability. The structure is simple and suitable for long-term complex working conditions.

[0258] In some embodiments, the material of the pressure strip 13 is metal.

[0259] The pressure strip 13 is made of metal, meaning that both the first pressure strip 14 and the second pressure strip 15 are made of metal with uniform material. Metal itself has high structural strength, bending stiffness, and resistance to plastic deformation. Compared with non-metallic materials such as plastic, it is not easy to bend, dent, warp, or loosen under external pressure, locking preload, vehicle driving bumps, alternating vibration, and torsional shear loads. It can continuously form a stable and uniform pressing and limiting effect on the edge of the cover 12, reliably restraining the relative sliding, lateral misalignment, and torsional deformation between the cover 12 and the box body 11, and improving the frame rigidity and overall assembly integrity of the battery box 10.

[0260] Metal materials exhibit excellent fatigue resistance, temperature resistance, and environmental adaptability. Under conditions of alternating high and low temperatures, humidity, dust, and long-term alternating loads, they will not experience problems such as aging, shrinkage, deformation, brittleness, or elasticity decay like plastic materials. The structural dimensions and mechanical properties remain stable, satisfying the pressing and bonding effect and limiting protection function of the pressure strip 13, thus extending the service life of the battery box 10.

[0261] Metal sheets are compatible with mature processes such as stamping, cutting, bending, and hole making. They can be processed into pressure strips 13 in one go, with regular outlines, high dimensional accuracy, good consistency and interchangeability of parts, which facilitates large-scale mass production and on-site assembly.

[0262] The metal surface can be treated with anti-rust and anti-corrosion spraying or passivation to resist external moisture, dust, acid and alkali media corrosion and prevent the pressure strip 13 from rusting and failing.

[0263] For example, the metal material of the pressure strip 13 can be any one of cold-rolled steel plate, galvanized steel plate, stainless steel plate, or aluminum alloy plate.

[0264] Cold-rolled steel sheets have high structural strength, good bending rigidity, and excellent stamping performance, making them easy to bend into the corresponding areas of the extension section 131 or overlapping section 16. They also have high dimensional accuracy and are not easily deformed by plasticity. Galvanized steel sheets have an additional galvanized protective layer on the basis of cold-rolled steel sheets, providing rust and corrosion resistance. They can adapt to humid, dusty, and condensation-prone working environments, preventing rust and cross-sectional failure of the pressure strip 13 after long-term use. Stainless steel sheets have excellent corrosion resistance, oxidation resistance, and acid and alkali resistance, with extremely strong environmental adaptability. They are not easily corroded by water vapor, salt spray, or corrosive media, and do not rust or degrade in performance after long-term use. They have high structural rigidity and strong resistance to fatigue deformation. Aluminum alloy sheets are lightweight and have low density, which can reduce the weight of the pressure strip 13 and meet the lightweight design requirements of the battery box 10. They also have good strength and bending performance, are easy to stamp, bend, and have good processing and forming properties.

[0265] In this embodiment, the pressure strip 13 is made of metal, which has higher structural strength and bending stiffness. It can reliably press and limit the cover 12 and the box body 11, improving the overall assembly integrity and structural torsional performance of the battery box 10. At the same time, the metal material has good resistance to high and low temperatures, aging, fatigue and corrosion, strong environmental adaptability, and is not prone to loosening, cracking or deformation failure after long-term use. It is also easy to stamp, bend and form holes in one piece, taking into account structural stability, durability and production process adaptability.

[0266] According to some embodiments of this application, this application also provides a pressure strip 13, which is connected to the surface of the cover 12 of the battery box 10 away from the box body portion 11. The pressure strip 13 is arranged around the edge of the cover 12. The orthographic projection of the pressure strip 13 along a first direction at least partially covers the orthographic projection of the connection surface between the box body portion 11 and the cover 12 along the first direction. The first direction is parallel to the thickness direction of the pressure strip 13. The pressure strip 13 includes a first pressure strip 14 and a second pressure strip 15. At least a portion of the first pressure strip 14 and at least a portion of the second pressure strip 15 are stacked along the first direction to form an overlapping section 16.

[0267] According to some embodiments of this application, this application also provides a battery device 100, which may include a battery housing 10 and a plurality of battery cells 20, wherein the plurality of battery cells 20 are housed in the battery housing 10.

[0268] It should be understood that the battery housing 10 may also include the battery housing 10 in any of the above embodiments.

[0269] According to some embodiments of this application, this application also provides an electrical device, which may include a battery device 100 for providing electrical energy.

[0270] It should be understood that the battery device 100 may include a battery housing 10 and a plurality of battery cells 20, wherein the plurality of battery cells 20 are housed in the battery housing 10. The battery housing 10 may also include the battery housing 10 of any of the above embodiments.

[0271] The electrical equipment can be a device or system that uses the battery device 100 in any of the above embodiments.

[0272] According to some embodiments of this application, see Figures 4 to 19This application provides a battery case 10, which may include a case portion 11, a case cover 12, and a pressure strip 13. The case portion 11 includes an opening; the case cover 12 closes to the opening; the pressure strip 13 is connected to the surface of the case cover 12 away from the case portion 11, and the pressure strip 13 is disposed around the edge of the case cover 12. The orthographic projection of the pressure strip 13 along a first direction at least partially covers the orthographic projection of the connection surface between the case portion 11 and the case cover 12 along the first direction. The first direction is parallel to the thickness direction of the pressure strip 13. The pressure strip 13 includes a first pressure strip 14 and a second pressure strip 15, and at least a portion of the first pressure strip 14 and at least a portion of the second pressure strip 15 are stacked along the first direction to form an overlapping section 16.

[0273] In some embodiments, the lid 12 includes an intersecting and connected first edge 121 and a second edge 122, and the orthographic projection of the overlapping segment 16 along a first direction covers the junction of the first edge 121 and the second edge 122.

[0274] In some embodiments, the lid 12 includes a first edge 121 and a second edge 122, the extension dimension of the first edge 121 is greater than the extension dimension of the second edge 122, the first edge 121 includes a middle segment 1211 and an end segment 1212, the end segment 1212 is located on at least one side of the middle segment 1211 along a second direction, the middle segment 1211 crosses the centerline of the first edge 121, and the orthographic projection of the overlapping segment 16 along a first direction is located within the orthographic projection of the end segment 1212 along the first direction; wherein, the second direction is the extension direction of the first edge 121.

[0275] The ratio of the dimension of the overlapping segment 16 along the second direction to the dimension of the first edge 121 along the second direction is k1, and the value of k1 is in the range of 1 / 12≤k1≤1 / 3. The dimension S1 of the overlapping segment 16 along the second direction is in the range of 30mm≤S1≤90mm.

[0276] The first pressure strip 14 includes a plurality of first mounting holes 142, the second pressure strip 15 includes a plurality of second mounting holes 152, the cover 12 includes a plurality of third mounting holes 123, and the battery box body 10 also includes a first fixing member 171 and a second fixing member 172. The first fixing member 171 passes through the corresponding first mounting hole 142 and the third mounting hole 123, and the second fixing member 172 passes through the corresponding second mounting hole 152 and the third mounting hole 123.

[0277] The first pressure strip 14 includes a first segment 141 and a second segment 143, and the second pressure strip 15 includes a third segment 151 and a fourth segment 153. The first segment 141 and the third segment 151 are stacked to form an overlapping segment 16. The ratio of the distance between the centers of two adjacent first mounting holes 142 in the first segment 141 to the distance between the centers of two adjacent first mounting holes 142 in the second segment 143 is k2, and the value of k2 is in the range of 0.5 ≤ k2 ≤ 1; and / or the ratio of the distance between the centers of two adjacent second mounting holes 152 in the third segment 151 to the distance between the centers of two adjacent second mounting holes 152 in the fourth segment 153 is k3, and the value of k3 is in the range of 0.5 ≤ k3 ≤ 1. The range of the distance S2 between the centers of two adjacent first mounting holes 142 in the first segment 141 is 15mm ≤ S2 ≤ 90mm; and / or the range of the distance S3 between the centers of two adjacent second mounting holes 152 in the third segment 151 is 15mm ≤ S3 ≤ 90mm.

[0278] In some embodiments, the thickness of the overlapping segment 16 is equal to the thickness of the remaining portion of the first pressure strip 14 excluding the first segment 141; and / or the thickness of the overlapping segment 16 is equal to the thickness of the remaining portion of the second pressure strip 15 excluding the third segment 151. The thickness h of the overlapping segment 16 ranges from 1 mm ≤ h ≤ 8 mm.

[0279] In some embodiments, the thickness of the first segment 141 is equal to the thickness of the remaining portion of the first pressure strip 14 excluding the first segment 141; and / or the thickness of the third segment 151 is equal to the thickness of the remaining portion of the second pressure strip 15 excluding the third segment 151.

[0280] In some embodiments, the first pressure strip 14 and / or the second pressure strip 15 include an extension section extending along a first direction and covering at least a portion of the outer surface of the sidewall of the housing portion 11, the sidewall being parallel to the first direction. The dimension S4 of the extension section along the first direction ranges from 1mm ≤ S4 ≤ 4mm. The extension section is connected to the sidewall of the housing portion 11 by sealant. The pressure strip 13 is made of metal.

[0281] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery housing, characterized in that, include: The housing part (11) includes an opening; Box lid (12), which closes to the opening; A pressure strip (13) is connected to the surface of the box cover (12) away from the box body (11). The pressure strip (13) is arranged around the edge of the box cover (12). The orthographic projection of the pressure strip (13) along a first direction at least partially covers the orthographic projection of the connection surface between the box body (11) and the box cover (12) along the first direction. The first direction is parallel to the thickness direction of the pressure strip (13). The pressure strip (13) includes a first pressure strip (14) and a second pressure strip (15). At least a portion of the first pressure strip (14) and at least a portion of the second pressure strip (15) are stacked along the first direction to form an overlapping section (16).

2. The battery housing according to claim 1, characterized in that, The lid (12) includes an intersecting and connected first edge (121) and second edge (122), and the overlapping segment (16) is projected along the first direction to cover the junction of the first edge (121) and the second edge (122).

3. The battery housing according to claim 1, characterized in that, The lid (12) includes a first edge (121) and a second edge (122), wherein the extension dimension of the first edge (121) is greater than the extension dimension of the second edge (122); The first edge (121) includes a middle segment (1211) and an end segment (1212), the end segment (1212) being located on at least one side of the middle segment (1211) along a second direction, the middle segment (1211) crossing the centerline of the first edge (121), and the orthographic projection of the overlapping segment (16) along the first direction being located within the orthographic projection of the end segment (1212) along the first direction; The second direction is the extension direction of the first edge (121).

4. The battery housing according to claim 3, characterized in that, The ratio of the dimension of the overlapping segment (16) along the second direction to the dimension of the first edge (121) along the second direction is k1, and the value of k1 is in the range of 1 / 12≤k1≤1 / 3.

5. The battery housing according to claim 4, characterized in that, The dimension S1 of the overlapping segment (16) along the second direction is in the range of 30mm≤S1≤90mm.

6. The battery housing according to claim 1, characterized in that, The first pressure strip (14) includes a plurality of first mounting holes (142), the second pressure strip (15) includes a plurality of second mounting holes (152), and the box cover (12) includes a plurality of third mounting holes (123). The battery housing also includes a first fixing member (171) and a second fixing member (172). The first fixing member (171) passes through the corresponding first mounting hole (142) and the third mounting hole (123), and the second fixing member (172) passes through the corresponding second mounting hole (152) and the third mounting hole (123).

7. The battery housing according to claim 6, characterized in that, The first pressure strip (14) includes a first segment (141) and a second segment (143), and the second pressure strip (15) includes a third segment (151) and a fourth segment (153). The first segment (141) and the third segment (151) are stacked to form the overlapping segment (16). The ratio of the distance between the centers of two adjacent first mounting holes (142) of the first segment (141) to the distance between the centers of two adjacent first mounting holes (142) of the second segment (143) is k2, where k2 ranges from 0.5 to 1; and / or The ratio of the distance between the centers of two adjacent second mounting holes (152) of the third segment (151) to the distance between the centers of two adjacent second mounting holes (152) of the fourth segment (153) is k3, and the value of k3 is in the range of 0.5≤k3≤1.

8. The battery housing according to claim 7, characterized in that, The distance S2 between the centers of two adjacent first mounting holes (142) in the first segment (141) is in the range of: 15mm ≤ S2 ≤ 90mm; and / or The distance S3 between the centers of two adjacent second mounting holes (152) in the third segment (151) is in the range of 15mm≤S3≤90mm.

9. The battery housing according to claim 1, characterized in that, The overlapping section (16) includes the first section (141) of the first pressure strip (14) and the third section (151) of the second pressure strip (15). The thickness of the overlapping segment (16) is equal to the thickness of the remaining portion of the first pressure strip (14) excluding the first segment (141); and / or The thickness of the overlapping section (16) is equal to the thickness of the remaining portion of the second pressure strip (15) except for the third section (151).

10. The battery housing according to claim 9, characterized in that, The thickness h of the overlapping segment (16) is in the range of 1mm≤h≤8mm.

11. The battery housing according to claim 1, characterized in that, The overlapping section (16) includes the first section (141) of the first pressure strip (14) and the third section (151) of the second pressure strip (15). The thickness of the first segment (141) is equal to the thickness of the remaining portion of the first pressure strip (14) excluding the first segment (141); and / or The thickness of the third segment (151) is equal to the thickness of the remaining portion of the second pressure strip (15) excluding the third segment (151).

12. The battery housing according to any one of claims 1 to 11, characterized in that, The first pressure strip (14) and / or the second pressure strip (15) include an extension (131) that extends along the first direction and covers at least a portion of the outer surface of the sidewall of the housing part (11). The sidewall of the box body (11) is parallel to the first direction.

13. The battery housing according to claim 12, characterized in that, The dimension S4 of the extension segment (131) along the first direction is in the range of 1mm≤S4≤4mm.

14. The battery housing according to claim 12, characterized in that, The extension section (131) is connected to the side wall of the housing part (11) by sealant.

15. The battery housing according to any one of claims 1 to 11, characterized in that, The material of the pressure strip (13) is metal.

16. A battery device, characterized in that, include: Multiple battery cells (20); A battery housing, the battery housing comprising any one of claims 1 to 15, wherein the plurality of battery cells (20) are housed in the battery housing.

17. An electrical appliance, characterized in that, include: A battery device, comprising the battery device according to claim 16, the battery device being used to provide electrical energy.

Images