CN220569817U - Lower box body of battery, battery and power utilization device - Google Patents

Abstract

The embodiment of the application provides a lower box of battery, battery and power consumption device, belongs to battery technical field. The lower case of the battery includes: a frame; the bottom plate is connected with the frame and forms a cavity for accommodating the battery cells, and is provided with a plurality of groups of bosses protruding towards the first surface, and the bosses of each group are mutually spaced; the reinforcing plate is arranged on the first surface of the bottom plate, the reinforcing plate is connected with the bottom plate in a welded mode, and welding seams are located among the bosses of each group. Through setting up multiunit boss, the welding seam is located between a plurality of bosses, except boss region between reinforcing plate and the bottom plate near messenger's welding seam, other regions are open setting, and the gas that the welding produced is discharged from open region easily, and the exhaust effect is good, can promote welding quality, promotes box structural strength and reliability.

Description

Lower box body of battery, battery and power utilization device

Technical Field

The present application relates to the field of battery technology, and more particularly, to a lower case of a battery, and an electric device.

Background

When the plate welding assembly of box, generally carry out laser penetration welding through being in the same place two plate overlap joints again, but because the plate laminating, the steam that produces when welding can't discharge, makes the welding defect appear easily, leads to structural strength impaired. In the related art, by arranging the whole escape passage near the welding seam, the exhaust effect is limited, and the occurrence of welding defects is still easy to cause.

Disclosure of Invention

The application provides a lower box of battery, battery and power consumption device to exhaust effect when promoting the welding can promote welding quality, promotes the structural strength of box.

In a first aspect, embodiments of the present application provide a lower case of a battery, including:

a frame;

the bottom plate is connected with the frame and forms a cavity for accommodating the battery cells, and is provided with a plurality of groups of bosses protruding towards the first surface, and the bosses of each group are mutually spaced;

the reinforcing plate is arranged on the first surface of the bottom plate, the reinforcing plate is connected with the bottom plate in a welded mode, and welding seams are located among the bosses of each group.

In the technical scheme, the welding seams are arranged among the bosses of each group, so that the areas except the boss between the reinforcing plate and the bottom plate near the welding seams are open, the gas generated by welding is easily discharged from the open area, the exhaust effect is good, the welding quality can be improved, and the structural strength and the reliability of the box body are improved.

In some embodiments, the weld is spaced apart from the boss.

In the technical scheme, the exhaust channel is formed between the welding seam and the boss, so that the gas generated by the welding seam is conveniently exhausted.

In some embodiments, the weld is a distance L from the boss that satisfies: l is more than 0mm and less than or equal to 5mm.

In some embodiments, the height of the boss is H, and the dimension of the boss along the length direction of the weld is D, which satisfies: h is more than or equal to 0.1mm and less than or equal to 0.5mm, and D is more than or equal to 5mm.

In some embodiments, the second face of the base plate has a recess opposite the boss.

In the technical scheme, the boss is formed by stamping the bottom plate, so that the second surface of the bottom plate is provided with the groove opposite to the boss, the processing is simple, and the production efficiency is improved.

In some embodiments, the reinforcement panel extends in a first direction, and the bezel has a first side rail extending in the first direction and a second side rail extending in a second direction.

In the above technical solution, the first side beam extending along the first direction and the second side beam extending along the second direction are provided to support the bottom plate in two directions, so as to strengthen the structural strength of the lower case.

In some embodiments, the projection of the reinforcing plate on the bottom plate coincides with the projection of the first side sill on the bottom plate on the first region of the bottom plate.

In the above technical solution, the reinforcing plate and the first side beam overlap, and play a role in reinforcing the bending strength of the bottom plate in the first direction.

In some embodiments, at least a portion of the weld is located in the first region on the projection of the base plate.

In the above technical solution, the connection between the reinforcing plate and the bottom plate is at least partially located in the first area, so as to be in contact with the first side Liang Zhengdui, thereby reinforcing two sides of the bottom plate.

In some embodiments, the welds are distributed in a plurality of rows along the second direction, each row including a plurality of welds distributed along the first direction.

In the technical scheme, the connection range of the reinforcing plate and the bottom plate is large, and the welding strength is high.

In some embodiments, the lower case of the battery further includes:

the reinforcing plate is arranged between two adjacent reinforcing beams.

In the above technical solution, the bending strength of the bottom plate in the second direction is reinforced together with the second side beam by providing the reinforcing beam on the first surface of the bottom plate.

In some embodiments, the reinforcement plate is spaced apart from the reinforcement beam.

In some embodiments, each set of bosses comprises two bosses, respectively, and the distribution direction of the two bosses coincides with the length direction of the corresponding weld seam.

In some embodiments, each set of bosses comprises four bosses, a center of the four bosses forms four corners of a rectangle, and corresponding welds of the four bosses are located in the rectangle.

In some embodiments, the reinforcement plate and the base plate are galvanized plates.

In a second aspect, embodiments of the present application provide a battery, including:

the lower case as in any one of the above embodiments;

the battery units are accommodated in the cavity of the lower box body.

In the technical scheme, the welding seams are arranged among the bosses of each group, so that the areas except the boss between the reinforcing plate and the bottom plate near the welding seams are open, the gas generated by welding is easily discharged from the open area, the exhaust effect is good, the welding quality can be improved, and the structural strength of the box body and the reliability of the battery are improved.

In some embodiments, the battery cell is adhered to the second face of the base plate by a structural adhesive, and the back face of the boss has a structural adhesive.

In the above technical scheme, the second surface of the bottom plate needs to be smoothed by structural adhesive, and the structural adhesive can be filled in the groove under the condition that the back of the boss is provided with the groove.

In a third aspect, an embodiment of the present application provides an electrical device, including:

the battery of any of the above embodiments, wherein the battery is configured to provide electrical energy.

In the technical scheme, the welding seams are arranged among the bosses of each group, so that the areas except the boss between the reinforcing plate and the bottom plate near the welding seams are open, the gas generated by welding is easily discharged from the open area, the exhaust effect is good, the welding quality can be improved, the structural strength of the box body is improved, and the reliability of the battery and the power utilization device is improved.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

FIG. 3 is a schematic diagram of a lower case according to some embodiments of the present disclosure;

FIG. 4 is a second schematic diagram of a lower case according to some embodiments of the present disclosure;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a third schematic diagram of a lower case according to some embodiments of the present disclosure;

FIG. 7 is an enlarged view of a portion of FIG. 6 at B;

FIG. 8 is a fourth schematic diagram of a lower case according to some embodiments of the present disclosure;

fig. 9 is a partial enlarged view of fig. 8 at C.

Reference numerals:

vehicle 1, battery 10, motor 20, controller 30;

a case 11;

lower case 110, bottom plate 111, first surface 1111, boss 1112, second surface 1113, recess 1114, frame 112, first side sill 1121, second side sill 1122, reinforcing plate 113, reinforcing beam 114, and weld 115;

an upper case 120;

a battery cell 12.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

The term "plurality" as used herein refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

The battery cells mentioned in the embodiments of the present application may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, to which the embodiments of the present application are not limited. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft pack battery cell are not limited thereto.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for housing one or more battery cells or a plurality of battery modules. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell includes a case, an electrode assembly, and an electrolyte, and the case is used to accommodate the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode plate, a negative electrode plate and a separation film. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together.

The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a wound structure or a lamination structure, and the embodiment of the present application is not limited thereto.

In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, a power battery plays an important role as a power source of the electric automobile. The battery is composed of a box body and a plurality of battery monomers accommodated in the box body. The battery is used as a core part of a new energy automobile, and has high requirements on safety and cycle service life.

In a general power battery, in the process of producing and assembling a battery box, plates of a box body of the battery are generally lapped together and then subjected to laser penetration welding, but because the plates are jointed, steam generated during welding cannot be discharged, the welding is easy to cause defects, and the structural strength is damaged. In the related art, an escape channel of the whole strip is arranged near the welding seam and used for exhausting gas generated during welding, but the exhaust effect is limited, welding defects are still easy to occur, the space occupied by the exhaust channel of the whole strip is more, and more structural adhesive is needed for filling during filling.

Based on the above consideration, in order to solve the technical problems that the gas generated in the welding process is difficult to be exhausted, so that the welding is defective and the structural strength of the box body is affected. The application designs a lower box of battery, including frame, bottom plate and reinforcing plate. The bottom plate is connected with the frame and forms a cavity for accommodating the battery monomer, the bottom plate is provided with a plurality of groups of bosses protruding towards the first surface, and the bosses of each group are mutually spaced; the reinforcing plate is arranged on the first surface of the bottom plate, the reinforcing plate is connected with the bottom plate in a welded mode, and the welding seams are located among the bosses of each group.

In the lower box body of the battery with the structure, the welding seams are arranged among the bosses of each group, so that the areas except for the bosses between the reinforcing plate and the bottom plate near the welding seams are open, the gas generated by welding is easily discharged from the open areas, the exhaust effect is good, the welding quality can be improved, and the structural strength and the reliability of the box body are improved. On the other hand, the boss occupies small space, and when structural adhesive is filled later, only a small amount of structural adhesive is needed to fill compared with the whole exhaust channel, so that materials are saved.

The battery disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the batteries. The power supply system of the power utilization device can be composed of the lower box body with the battery, the battery and the like, so that the application range of the lower box body of the battery is favorably improved, and the assembly difficulty of the lower box body of the battery is reduced.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, and the electricity utilization device can be, but is not limited to, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, for example, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1.

As shown in fig. 1, a schematic structural diagram of a vehicle 1 according to an embodiment of the present application is shown, where the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The motor 20, the controller 30 and the battery 10 may be provided inside the vehicle 1, and the controller 30 is configured to control the battery 10 to supply power to the motor 20. For example, the battery 10 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, e.g. the battery 10 may be used as an operating power source for the vehicle 1, for electrical circuitry of the vehicle 1, e.g. for start-up, navigation and operational power requirements of the vehicle 1. In another embodiment of the present application, the battery 10 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1.

To meet different power requirements, the battery 10 may include a plurality of battery cells (not shown), where the plurality of battery cells may be connected in series or parallel or a series-parallel connection, and a series-parallel connection refers to a mixture of series and parallel connection.

As shown in fig. 2, a structural exploded view of the battery 10 according to one embodiment of the present application is shown. The battery 10 includes a case 11 and a plurality of battery cells 12, and the battery cells 12 are accommodated in the case 11. The case 11 is used to provide an assembly space for the battery cells 12, and the case 11 may have various structures. In some embodiments, the case 11 may include a lower case 110 and an upper case 120, the lower case 110 and the upper case 120 being overlapped with each other, the lower case 110 and the upper case 120 together defining an assembly space for receiving the battery cell 12. The upper case 120 may have a hollow structure with one end opened, the lower case 110 may have a plate-shaped structure, and the lower case 110 covers the open side of the upper case 120, so that the lower case 110 and the upper case 120 together define an assembly space; the lower case 110 and the upper case 120 may be hollow structures with one side opened, and the open side of the lower case 110 is closed to the open side of the upper case 120. Of course, the case 11 formed by the lower case 110 and the upper case 120 may be of various shapes, such as a cylinder, a rectangular parallelepiped, etc.

In the battery 10, the plurality of battery cells 12 may be connected in series or parallel or a series-parallel connection, wherein a series-parallel connection refers to that the plurality of battery cells 12 are connected in series or parallel. The plurality of battery cells 12 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 12 is accommodated in the box 11; of course, the battery 10 may also be a battery module form formed by connecting a plurality of battery cells 12 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole and be accommodated in the case 11. The battery 10 may also include other structures, for example, the battery 10 may also include a bus bar member for making electrical connection between the plurality of battery cells 12.

Wherein each battery cell 12 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cells 12 may be cylindrical, flat, rectangular, or otherwise shaped. Illustratively, in fig. 2, the battery cell 12 is cylindrical in shape.

According to some embodiments of the present application, as shown in fig. 3 to 9, there is provided a lower case 110 of a battery 10, the lower case 110 including a frame 112, a bottom plate 111, and a reinforcing plate 113.

As shown in fig. 3 to 5, the bottom plate 111 is connected to the frame 112, and forms a cavity for accommodating the battery cells 12 with the frame 112, and the bottom plate 111 is provided with a plurality of sets of bosses 1112 protruding toward the first face 1111, and the plurality of bosses 1112 of each set are spaced apart from each other.

The frame 112 forms a frame structure supporting the entire base plate 111, and the base plate 111 is connected to the frame 112 to form a cavity for accommodating the battery cells 12. The base plate 111 has a first surface 1111 and a second surface 1113 opposite to each other, a plurality of groups of bosses 1112 protruding toward the first surface 1111 are provided on the base plate 111, each group of bosses 1112 includes a plurality of bosses 1112, the plurality of bosses 1112 in each group are disposed at intervals, and the frame 112 is mounted on the second surface 1113 of the base plate 111 to support and strengthen the second surface 1113 of the base plate 111, specifically, the second surface 1113 of the base plate 111 is connected with the frame 112 to form a cavity for accommodating the battery cell 12.

The reinforcing plate 113 is mounted to the first face 1111 of the base plate 111, the reinforcing plate 113 is welded to the base plate 111, and the weld 115 is located between the plurality of bosses 1112 of each set. The reinforcement plate 113 plays a role in reinforcing structural strength of the first surface 1111 of the bottom plate 111, and is balanced with the frame 112 of the second surface 1113 of the bottom plate 111, so that the structure is more stable. The reinforcing plate 113 is welded to the bottom plate 111, the welding line 115 has a plurality of segments, and the welding line 115 is located between the plurality of bosses 1112 of each group, because the bosses 1112 are disposed to protrude from the first face 1111 of the bottom plate 111, so that the reinforcing plate 113 is disposed at a distance from the bottom plate 111 in the region of the welding line 115, that is, the reinforcing plate 113 and the bottom plate 111 are disposed in an open state except for the position where the bosses 1112 abut against the reinforcing plate 113 and the region of the welding line 115, and the gas generated during welding can be easily discharged from the open region.

In actual implementation, a plurality of sets of bosses 1112 are formed on the first surface 1111 of the base plate 111 in advance, when the base plate 111 is connected to the reinforcing plate 113, the reinforcing plate 113 is supported on the plurality of sets of bosses 1112, and is welded at spaced positions between the plurality of bosses 1112 of each set, so that the weld bead 115 is located between the plurality of bosses 1112 of each set, and gas generated by welding can be smoothly discharged from an open area around the weld bead 115, so that welding defects are not likely to occur.

According to the lower case 110 of the battery 10 provided by the embodiment of the application, the welding seam 115 is arranged between the bosses 1112 of each group, so that the area except for the boss 1112 between the reinforcing plate 113 and the bottom plate 111 near the welding seam 115 is open, other areas are all open, gas generated by welding is easily discharged from the open area, the exhaust effect is good, welding defects are not easy to generate, the welding quality can be improved, and the structural strength and the reliability of the case 11 are further improved.

According to some embodiments of the present application, as shown in fig. 5, the weld 115 may be spaced apart from the boss 1112.

When the gas generated by welding is discharged, the boss 1112 is in contact with the reinforcing plate 113, and thus the position of the boss 1112 has a certain influence on the gas discharge. By arranging the weld 115 at a distance from the boss 1112, the entire periphery of the region where the weld 115 is located is opened, and the exhaust is smoother.

According to the embodiment of the application, the welding line 115 is arranged at a distance from the boss 1112, and an exhaust passage is formed between the welding line 115 and the boss 1112, so that gas generated by the welding line 115 can be conveniently exhausted.

According to some embodiments of the present application, as shown in fig. 5, the distance from the weld 115 to the boss 1112 is L, which may satisfy: l is more than 0mm and less than or equal to 5mm.

In this embodiment, for convenience of processing and manufacturing, the root dimension of the boss 1112 is greater than the end dimension of the boss 1112, the distance from the weld 115 to the boss 1112 is L, specifically, the distance from the weld 115 to the root of the boss 1112 is L, and 0mm < L is less than or equal to 5mm, it is understood that the greater L is, the greater the exhaust passage between the weld 115 and the boss 1112 is, the smoother the exhaust is, but if L is too large, the structural stability at the weld 115 will be affected. Wherein, L may specifically be: l=1 mm; or l=2 mm; or l=3 mm; or l=4 mm; or l=5 mm.

According to some embodiments of the present application, as shown in fig. 5, the height of the boss 1112 is H, and the dimension of the boss 1112 along the length direction of the weld 115 is D, which may satisfy: h is more than or equal to 0.1mm and less than or equal to 0.5mm, and D is more than or equal to 5mm.

In the present embodiment, the height of the boss 1112 is low, and the exhaust passage is formed between the bottom plate 111 and the reinforcing plate 113, without causing an excessive distance between the bottom plate 111 and the reinforcing plate 113, which would affect welding. The height H of the boss 1112 may be: h=0.1 mm; or h=0.2 mm.

The size of the boss 1112 is not too large, and under the condition of ensuring the supporting strength, shielding of the excessive size of the boss 1112 during exhaust is reduced, so that the exhaust effect is improved. Wherein, boss 1112 can be round platform shape, and the size of boss 1112 can be: d=4.5 mm; or d=4 mm; or d=3 mm.

According to some embodiments of the present application, as shown in fig. 5, the second side 1113 of the base plate 111 may have a recess 1114 opposite the boss 1112.

The second surface 1113 of the base plate 111 may have a plurality of grooves 1114, where the plurality of grooves 1114 correspond to the plurality of bosses 1112 one by one, in this embodiment, the bosses 1112 on the base plate 111 may be formed by punching, which has high processing efficiency and mechanical properties, and the bosses 1112 may be formed by punching with a circular punch or by punching with a rectangular punch, and the specific shape of the bosses 1112 is not limited herein.

According to the embodiment of the application, the boss 1112 is formed by stamping the bottom plate 111, so that the second surface 1113 of the bottom plate 111 is provided with the groove 1114 opposite to the boss 1112, the processing is simple, and the production efficiency is improved. In addition, because the size of the boss 1112 is smaller, the grooves 1114 formed by stamping are smaller, and the amount of structural adhesive required when filling up the grooves 1114 is smaller, so that materials are saved and the cost is reduced.

According to some embodiments of the present application, as shown in fig. 3 and 4, the reinforcement plate 113 extends in a first direction, and the frame 112 has a first side rail 1121 extending in the first direction and a second side rail 1122 extending in a second direction.

In the present embodiment, the first direction and the second direction are disposed to intersect, and the reinforcing plate 113 extends along the first direction to reinforce the bottom plate 111 in the first direction. The frame 112 has first and second side rails 1121 and 1122, and the first and second side rails 1121 and 1122 may support and reinforce edges of the bottom plate 111 such that the first and second side rails 1121 and 1122 reinforce the bottom plate 111 in a first direction and the second side rails 1122 reinforce the bottom plate 111 in a second direction.

In some embodiments, the first direction and the second direction are perpendicular to each other, the bottom plate 111 is rectangular, and the first direction is the length direction of the bottom plate 111, and the second direction is the width direction of the bottom plate 111. The first side beams 1121 are provided with two side beams disposed at intervals along the second direction, the second side beams 1122 are provided with two side beams disposed at intervals along the first direction, and the two first side beams 1121 are respectively connected with the two second side beams 1122 to form the frame 112. At least two reinforcing plates 113 are provided corresponding to the two first side rails 1121, and the two reinforcing plates 113 correspond to the two first side rails 1121.

According to the embodiment of the present application, the bottom plate 111 is supported in both directions by providing the first side beam 1121 and the second side beam 1122, and the structural strength of the lower case 110 is reinforced by providing the reinforcing plate 113 to support the bottom plate 111 in the first direction.

According to some embodiments of the present application, as shown in fig. 3 and 4, the projection of the reinforcing plate 113 on the bottom plate 111 may coincide with the projection of the first side sill 1121 on the bottom plate 111 at the first region of the bottom plate 111.

The reinforcing plate 113 is disposed on the first surface 1111 of the bottom plate 111, the first side beam 1121 is disposed on the second surface 1113 of the bottom plate 111, and the projection of the reinforcing plate 113 on the bottom plate 111 overlaps with the projection of the first side beam 1121 on the bottom plate 111 in the first area of the bottom plate 111, so that the reinforcing plate 113 and the first side beam 1121 are disposed opposite to each other in the first area of the bottom plate 111, the first area of the bottom plate 111 has higher structural strength and higher bending resistance, and the lower case 110 is prevented from being broken due to shearing force at the weak part as much as possible.

According to some embodiments of the present application, as shown in fig. 3, 6, and 8, the projection of at least a portion of weld bead 115 onto base plate 111 is located in a first region.

In this embodiment, at least part of the welding seam 115 is projected on the first area of the bottom plate 111, so that the reinforcing plate 113 is connected with the first area of the bottom plate 111, and the bottom plate 111 is connected with the reinforcing structure on both the first surface 1111 and the second surface 1113 of the first area, so that the assembly is more balanced in hand, the structural strength is better, and the bending resistance effect is better.

According to the embodiment provided in the application, the connection part between the reinforcing plate 113 and the bottom plate 111 is at least partially located in the first area, so as to be opposite to the first side beam 1121, so as to realize reinforcement on two sides of the bottom plate 111.

According to some embodiments of the present application, as shown in fig. 3, 6, and 8, the welds 115 may be distributed in multiple rows along the second direction, each row may include multiple welds 115 distributed along the first direction.

In the present embodiment, the welding lines 115 are distributed in a plurality of rows along the second direction, a plurality of rows of welding lines 115 are provided between each reinforcing plate 113 and the bottom plate 111, and the strength of connection between the reinforcing plates 113 and the bottom plate 111 is improved by providing a plurality of rows of welding lines 115.

In some embodiments, the reinforcing panels 113 include a plurality of primary second direction distribution, with at least two rows of welds 115 disposed between each reinforcing panel 113 and the base panel 111, wherein at least one row of welds 115 is located between the reinforcing panel 113 and the first region of the base panel 111.

According to the embodiment of the application, the plurality of rows of welding seams 115 are arranged, so that the connection range of the reinforcing plate 113 and the bottom plate 111 is large, and the welding strength is high.

According to some embodiments of the present application, as shown in fig. 3 and 4, the lower case 110 of the battery 10 may further include a reinforcement beam 114. Reinforcing beams 114 may be mounted to the first face 1111 of the base plate 111, the reinforcing beams 114 may extend in the second direction, and the reinforcing plates 113 may be located between two adjacent reinforcing beams 114.

In the present embodiment, the reinforcing beams 114 may be provided in plurality, and the plurality of reinforcing beams 114 may be disposed at intervals in the first direction to reinforce the bending resistance of the base plate 111 in the second direction. The reinforcing plate 113 may be disposed between two adjacent reinforcing beams 114, and the reinforcing plate 113 and the reinforcing beams 114 together form a reinforcing structure disposed on the first surface 1111 of the bottom plate 111 to reinforce the structural strength of the lower case 110.

The projection of the reinforcing beam 114 on the bottom plate 111 and the projection of the frame 112 on the bottom plate 111 have overlapping areas, specifically, a portion of the reinforcing beam 114 may be disposed corresponding to the second side beam 1122, the projection of two ends of the reinforcing beam 114 on the bottom plate 111 may overlap with the projection of the first side beam 1121 on the bottom plate 111, and the lower case 110 may be prevented from being broken due to the shearing force at the weak point as much as possible.

According to the reinforcement beam 114 provided in the embodiment of the present application, the reinforcement beam 114 is disposed on the first surface 1111 of the bottom plate 111, and the reinforcement beam and the second side beam 1122 are disposed together to reinforce the bending strength of the bottom plate 111 in the second direction.

According to some embodiments of the present application, the reinforcement plate 113 may be spaced apart from the reinforcement beam 114. By disposing the reinforcing plate 113 at a distance from the reinforcing beam 114, stress concentration at the junction of the reinforcing plate 113 and the reinforcing beam 114 is avoided.

According to some embodiments of the present application, as shown in fig. 6 and 7, each set of bosses 1112 may include two bosses 1112, respectively, and the distribution direction of the two bosses 1112 coincides with the length direction of the corresponding weld 115.

In the present embodiment, the length direction of the weld 115 is a first direction, a set of two bosses 1112 are disposed at intervals along the first direction, and the weld 115 is disposed between the two bosses 1112. By providing two bosses 1112 to space the reinforcing plate 113 in the region of the weld 115 from the bottom plate 111, the structure is simple and easy to manufacture.

According to some embodiments of the present application, as shown in fig. 8 and 9, each set of bosses 1112 may include four bosses 1112, respectively, with the centers of the four bosses 1112 forming four corners of a rectangle, and the welds 115 corresponding to the four bosses 1112 being located within the rectangle. By providing a set of four bosses 1112, the support structure is more stable.

According to some embodiments of the present application, both the reinforcing plate 113 and the bottom plate 111 may be galvanized plates. The galvanized sheet has mature manufacturing process and good mechanical property and corrosion resistance. And zinc is easy to evaporate and gasify under the action of high temperature when the galvanized sheet is welded, so that a large amount of zinc steam is generated, and welding defects are easy to occur due to untimely discharge.

According to the lower box 110 provided by the embodiment of the application, the welding seams 115 are arranged among the bosses 1112 of each group, so that the areas except for the bosses 1112 between the reinforcing plate 113 and the bottom plate 111 near the welding seams 115 are open, other areas are open, zinc vapor generated by welding is easily discharged from the open areas, the exhaust effect is good, welding defects are not easy to generate, the welding quality can be improved, and the structural strength and the reliability of the box 11 are further improved.

According to some embodiments of the present application, there is further provided a battery 10, including the lower case 110 and the plurality of battery cells 12 according to any of the embodiments described above, wherein the plurality of battery cells 12 are accommodated in the cavity of the lower case 110.

According to the battery 10 provided by the embodiment of the application, the welding seams 115 are arranged among the bosses 1112 of each group, so that the areas except for the bosses 1112 between the reinforcing plate 113 and the bottom plate 111 near the welding seams 115 are all open, the gas generated by welding is easily discharged from the open areas, the exhaust effect is good, the welding quality can be improved, and the structural strength of the box 11 and the reliability of the battery 10 are improved.

According to some embodiments of the present application, the battery cell 12 is adhered to the second face 1113 of the base plate 111 by a structural adhesive, and the backside of the boss 1112 has the structural adhesive. To facilitate the mounting and sealing of the battery cells 12, the second side 1113 of the base 111 needs to be filled with structural adhesive, and the back of the boss 1112 is also provided with structural adhesive. In the case where the backside of the boss 1112 has a recess 1114, the structural adhesive may be filled in the recess 1114. Because the boss 1112 is smaller, the recess 1114 is smaller, and the amount of structural adhesive required to fill the recess 1114 is smaller, saving material and reducing cost.

According to some embodiments of the present application, there is also provided an electrical device comprising a battery 10 according to any of the embodiments described above, the battery 10 being adapted to provide electrical energy.

In the above technical solution, the weld joint 115 is disposed between the plurality of bosses 1112 in each group, so that the areas except for the areas of the bosses 1112 between the reinforcing plate 113 and the bottom plate 111 near the weld joint 115 are all open, the gas generated by welding is easily discharged from the open areas, the exhaust effect is good, the welding quality can be improved, the structural strength of the case 11 is improved, and the reliability of the battery 10 and the power utilization device is improved.

Referring to fig. 3-9, a lower case 110 of a battery 10 is provided according to some embodiments of the present application, the lower case 110 including a bottom plate 111, a frame 112, a reinforcing plate 113, and a reinforcing beam 114.

The base plate 111 has a first surface 1111 and a second surface 1113, and a plurality of sets of bosses 1112 protruding toward the first surface 1111 are provided on the base plate 111, each set of bosses 1112 includes a plurality of bosses 1112, and the plurality of bosses 1112 of each set are disposed at intervals. The boss 1112 is formed by stamping and the second face 1113 of the base plate 111 has a plurality of grooves 1114 corresponding to the plurality of bosses 1112.

The frame 112 includes two first side beams 1121 disposed at intervals along the second direction, and two second side beams 1122 disposed at intervals along the first direction, the first side beams 1121 extending along the first direction, the second side beams 1122 extending along the second direction, the first direction and the second direction being perpendicular to each other such that the two first side beams 1121 and the two second side beams 1122 constitute a rectangular frame 112, the rectangular frame 112 being connected to the second face 1113 of the bottom plate 111 and disposed along an edge of the bottom plate 111.

The reinforcement beams 114 extend along the second direction and are provided with a plurality of reinforcement beams 114, the plurality of reinforcement beams 114 are distributed on the first surface 1111 of the base plate 111 at intervals along the first direction, and the projection of the reinforcement beams 114 on the base plate 111 is overlapped with the projection part of the frame 112 on the base plate 111. The reinforcing plates 113 extend along the first direction and are arranged between two adjacent reinforcing beams 114, the reinforcing plates 113 are provided in plurality, two reinforcing plates 113 which are arranged at intervals along the second direction are arranged between two adjacent reinforcing beams 114, and the projection of the reinforcing plates 113 on the bottom plate 111 coincides with the projection of the first side beams 1121 on the floor in the first area of the bottom plate 111.

The reinforcing plate 113 is welded to the base plate 111 with a weld 115 between each set of a plurality of bosses 1112. Wherein each set of bosses 1112 may include two bosses 1112 or four bosses 1112, when a set of bosses 1112 includes two bosses 1112, the two bosses 1112 are disposed spaced apart along the first direction, and the weld 115 is located between the two bosses 1112 and spaced apart from the bosses 1112; when the set of bosses 1112 includes four bosses 1112, the four bosses 1112 are spaced apart from each other and the respective center lines are rectangular, and the weld 115 is located in the rectangular region and spaced apart from the four bosses 1112.

The welds 115 are distributed in a plurality of rows along the second direction, each row including a plurality of welds 115 extending along the first direction, the projection of at least one row of welds 115 onto the base plate 111 being located within the first region.

It should be noted that, without conflict, the embodiments and features of the embodiments in the present application may be combined with each other.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (17)

1. A lower case of a battery, comprising:

a frame;

the bottom plate is connected with the frame and forms a cavity for accommodating the battery cells, and is provided with a plurality of groups of bosses protruding towards the first surface, and the bosses of each group are mutually spaced;

the reinforcing plate is arranged on the first surface of the bottom plate, the reinforcing plate is connected with the bottom plate in a welded mode, and welding seams are located among the bosses of each group.

2. The lower case of a battery according to claim 1, wherein the weld is spaced apart from the boss.

3. The lower case of a battery according to claim 2, wherein the distance from the weld to the boss is L, satisfying: l is more than 0mm and less than or equal to 5mm.

4. The lower case of a battery according to claim 1, wherein the boss has a height H, and the boss has a dimension D along the length direction of the weld, satisfying: h is more than or equal to 0.1mm and less than or equal to 0.5mm, and D is more than or equal to 5mm.

5. The lower case of the battery according to claim 1, wherein the second face of the bottom plate has a groove opposite to the boss.

6. The lower case of a battery according to any one of claims 1 to 5, wherein the reinforcement plate extends in a first direction, and the frame has a first side rail extending in the first direction and a second side rail extending in a second direction.

7. The lower case of a battery according to claim 6, wherein a projection of the reinforcing plate on the bottom plate coincides with a projection of the first side sill on the bottom plate on a first area of the bottom plate.

8. The lower case of a battery according to claim 7, wherein a projection of at least a portion of the weld on the bottom plate is located in the first region.

9. The lower case of the battery according to claim 7, wherein the weld lines are distributed in a plurality of rows in the second direction, each row including a plurality of weld lines distributed in the first direction.

10. The lower case of the battery according to claim 6, further comprising:

the reinforcing plate is arranged between two adjacent reinforcing beams.

11. The lower case of a battery according to claim 10, wherein the reinforcement plate is spaced apart from the reinforcement beam.

12. The lower case of a battery according to any one of claims 1 to 5, wherein each set of bosses includes two bosses, respectively, and the distribution direction of the two bosses coincides with the length direction of the corresponding weld.

13. The lower case of a battery according to any one of claims 1 to 5, wherein each set of bosses comprises four bosses, respectively, the centers of the four bosses forming four corners of a rectangle, and the welds corresponding to the four bosses are located within the rectangle.

14. The lower case of a battery according to any one of claims 1 to 5, wherein the reinforcing plate and the bottom plate are both galvanized plates.

15. A battery, comprising:

the lower case according to any one of claims 1 to 14;

the battery units are accommodated in the cavity of the lower box body.

16. The battery of claim 15, wherein the battery cells are adhered to the second face of the base plate by structural adhesive and the back face of the boss has structural adhesive.

17. An electrical device, comprising:

a battery as claimed in claim 15 or 16, for providing electrical energy.