CN219658859U - Battery box, battery and power consumption device - Google Patents

Abstract

The utility model discloses a battery box, a battery and an electric device. The box body comprises a base plate, a beam body, a connecting piece and a reinforcing plate. The beam body is arranged on one side of the substrate, and the base material of the substrate is different from that of the beam body. The connecting piece connects the base plate and the beam body. The reinforcing plate sets up in the base plate one side that deviates from the roof beam body and is fixed in the base plate, and the reinforcing plate is equipped with dodges the structure, dodges the structure and is used for dodging the connecting piece to make connecting piece and reinforcing plate do not overlap in the thickness direction of base plate.

Description

Battery box, battery and power consumption device

Technical Field

The utility model relates to the field of batteries, in particular to a battery box, a battery and an electric device.

Background

With the development of new energy technology, the battery is increasingly widely applied, for example, to mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy automobiles, electric toy ships, electric toy airplanes, electric tools and the like.

The development of battery technology is taking into consideration various design factors such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, and the reliability of the battery. How to improve the reliability of the battery is an important research direction in the field of batteries.

Disclosure of Invention

The utility model provides a battery case, a battery and an electric device, which can improve reliability.

In a first aspect, the present utility model provides a case for a battery, which includes a base plate, a beam, a connecting member, and a reinforcing plate. The beam body is arranged on one side of the substrate, and the base material of the substrate is different from that of the beam body. The connecting piece connects the base plate and the beam body. The reinforcing plate sets up in the base plate one side that deviates from the roof beam body and is fixed in the base plate, and the reinforcing plate is equipped with dodges the structure, dodges the structure and is used for dodging the connecting piece to make connecting piece and reinforcing plate do not overlap in the thickness direction of base plate.

The connection member may connect the substrate and the beam body having different base materials, thereby increasing the connection strength of the substrate and the beam body. The reinforcing plate can strengthen the intensity of the area of the base plate, which is close to the connecting piece, when the battery is impacted by the outside, the risk of deformation and rupture of the box body can be reduced, and the reliability of the battery is improved. The avoidance structure is arranged on the reinforcing plate, and the connecting piece can connect the base plate and the beam body without contacting with the reinforcing plate, so that the mounting difficulty of the connecting piece is reduced; through setting up and dodging the structure, can also make reinforcing plate and connecting piece share a partial space in thickness direction, reduce reinforcing plate and connecting piece size stack in thickness direction, increase space utilization improves the energy density of battery.

In some embodiments, the base material of the stiffener is the same as the base material of the substrate to which the stiffener is welded. The welding process is simple, and the assembly efficiency is improved.

In some embodiments, the reinforcing plate and the base plate are welded to form a welding part, and the welding part and the avoidance structure are arranged at intervals, so that deformation of the avoidance structure under the action of welding heat in the welding process is reduced, and the risk of interference between the reinforcing plate and the connecting piece is reduced.

In some embodiments, the connection is provided in a plurality. The reinforcing plate is provided with a plurality of avoidance structures, and each avoidance structure is used for avoiding at least one connecting piece.

The plurality of connecting pieces can improve the connection strength of the base plate and the beam body, improve the uniformity of the stress of the base plate and the beam body and reduce the stress concentration. Through setting up a plurality of structures of dodging, can dodge a plurality of connecting pieces simultaneously to reduce the installation degree of difficulty of a plurality of connecting pieces simultaneously, increase space utilization, improve the energy density of battery.

In some embodiments, the relief structure includes at least one of a through hole and a groove that extend through the stiffener in a thickness direction. The through holes and the grooves are simple in structure and easy to form.

In some embodiments, the case includes a plurality of reinforcing plates. The plurality of reinforcing plates can increase the overall strength of the box body and improve the reliability of the battery.

In some embodiments, the plurality of reinforcement plates includes a first reinforcement plate and a second reinforcement plate. In the thickness direction, the first reinforcing plate and the second reinforcing plate partially overlap. The first reinforcing plate and the second reinforcing plate are overlapped, so that the local strength of the box body can be further improved, and the reliability of the box body is improved.

In some embodiments, the first reinforcing plate and the second reinforcing plate are each provided with a relief structure in a region where the first reinforcing plate and the second reinforcing plate overlap, and the relief structure of the first reinforcing plate and the relief structure of the second reinforcing plate overlap at least partially in the thickness direction.

In the region that first reinforcing plate and second reinforcing plate overlap, the dodging structure of first reinforcing plate and the dodging structure of second reinforcing plate can dodge the connecting piece simultaneously to reduce the installation degree of difficulty of connecting piece, increase space utilization, improve the energy density of battery.

In some embodiments, the connector includes a fastener including a head on a side of the base plate facing away from the beam and a threaded rod extending from the head, through the base plate, and threadably coupled to the beam, and a first seal. The first sealing member is clamped between the head and the base plate.

The fastener can connect the base plate and the beam body having different base materials, thereby increasing the connection strength of the base plate and the beam body. The fastener is a common piece and has lower cost. By providing the first seal, the sealing performance of the case at the fastener can be improved. The fastener is not required to be connected with the reinforcing plate, so that the reinforcing plate is not required to participate in sealing, the structure of the box body is simplified, and the sealing difficulty is reduced.

In some embodiments, the first seal is bonded to the head. The first seal member is bonded to the head portion and is mountable to the base plate along with the fastener, thereby improving assembly efficiency. The first sealing element can be pre-connected with the fastening element and then fed together, so that time and cost can be saved.

In some embodiments, the fastener comprises a self-tapping screw. The self-tapping screw is simple in installation process and high in assembly efficiency.

In some embodiments, the box further comprises a second seal disposed between the base plate and the beam and surrounding the threaded rod. By arranging the second sealing piece, the gap between the substrate and the beam body can be sealed, and the sealing performance of the box body is improved.

In some embodiments, the base material of the base plate is steel and the base material of the beam body is aluminum. Aluminum has a small weight, and the adoption of the aluminum beam body can reduce the overall weight of the box body and improve the energy density of the battery. The steel has higher structural strength, is difficult for deformation when receiving external impact, adopts the base plate of steel to protect the battery monomer, reduces the security risk.

In a second aspect, the present utility model provides a battery, which includes a battery cell and a case provided in any embodiment of the first aspect. The battery monomer is arranged on one side of the base plate facing the beam body.

In a third aspect, the present utility model provides an electrical device comprising a battery as provided in any one of the embodiments of the first aspect, the battery being for providing electrical energy.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

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

fig. 2 is an exploded view of a battery according to some embodiments of the present utility model;

FIG. 3 is a schematic diagram of a box according to some embodiments of the present utility model;

FIG. 4 is an enlarged schematic view of FIG. 3 at the circle;

FIG. 5 is a schematic partial cross-sectional view of a tank according to some embodiments of the present utility model;

FIG. 6 is a schematic structural view of a reinforcing plate of a case according to some embodiments of the present utility model;

FIG. 7 is an enlarged schematic view of FIG. 5 at the circle;

fig. 8 is a cross-sectional view of a connector for a case according to some embodiments of the present utility model.

In the drawings, the drawings are not necessarily to scale.

Detailed Description

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

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 utility model 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 utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. 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 utility model. 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.

In the description of the present utility model, 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 above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present utility model is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present utility model, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present utility model, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the utility model shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the utility model in any way.

In embodiments of the present utility model, "parallel" includes not only the case of absolute parallelism, but also the case of substantially parallelism that is conventionally recognized in engineering; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering. Illustratively, the angle between the two directions is 85 ° -90 °, which can be considered to be perpendicular; the included angle between the two directions is 0-5 degrees, and the two directions can be considered to be parallel.

The term "plurality" as used herein refers to two or more (including two).

In embodiments of the present utility model, a battery refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

In the embodiment of the utility model, the battery cell can be a secondary battery cell, and the secondary battery cell refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

The battery cell may be a lithium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc., which is not limited by the embodiment of the utility model.

The battery cell may be a prismatic battery cell, a soft pack battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square case battery cell, a blade-shaped battery cell, a polygonal battery cell, for example, a hexagonal battery cell, etc., and the present utility model is not particularly limited.

In some embodiments, the battery may be a battery pack, which generally includes a case and a battery cell, the battery cell or battery module being housed in the case. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

With the development of new energy technology, the light weight requirement and the strength requirement of the battery on the box body are gradually improved. Connecting parts of various materials into a box is one possible way of balancing the weight and strength of the box.

Taking the substrate and the side beam of the box body as examples, under the condition that the substrate and the side beam are made of different materials, if the substrate and the side beam are connected in a welding mode, insufficient connection strength of the substrate and the side beam can be caused. Thus, the dissimilar materials of the base and edge beams are typically joined by a connector (e.g., a fastener).

However, when the battery is subjected to external impact, the area of the substrate close to the connecting piece is stressed greatly, so that the risks of deformation and breakage of the substrate are easily caused, and the reliability of the battery is affected.

In some embodiments, a reinforcing plate may be provided at a region of the base plate where connection with the connection member is required, so as to increase the strength of a region of the case close to the connection member and reduce the risk of deformation and breakage of the case. However, in assembling the connector, the connector generally needs to pass through the reinforcing plate to be connected to the substrate, which increases the difficulty in mounting the connector. The connecting piece and the reinforcing plate occupy space, so that the volume of the box body can be increased, and the energy density of the battery can be reduced.

In view of this, the embodiment of the utility model provides a box body, which can reduce the installation difficulty of a connecting piece, increase the space utilization rate and improve the energy density of a battery by arranging an avoidance structure on a reinforcing plate.

The box body described in the embodiment of the utility model is suitable for batteries and power utilization devices using the batteries.

The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the utility model does not limit the electric device in particular.

For convenience of explanation, the following examples will be described taking an electric device as an example of a vehicle.

Fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present utility model.

As shown in fig. 1, the interior of the vehicle 1 is provided with a battery 2, and the battery 2 may be provided at the bottom or at the head or at the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, for example, the battery 2 may serve as an operating power source of the vehicle 1.

The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being arranged to control the battery 2 to power the motor 4, for example for operating power requirements during start-up, navigation and driving of the vehicle 1.

In some embodiments of the utility model, the battery 2 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.

Fig. 2 is an exploded view of a battery according to some embodiments of the present utility model. As shown in fig. 2, the battery 2 includes a battery cell 6, and the battery cell 6 may be the smallest unit constituting the battery.

In some embodiments, the battery 2 includes a first case 5a and a second case 5b, the first case 5a and the second case 5b are mutually covered, and the first case 5a and the second case 5b together define an accommodating space 5c for accommodating the battery cell 6. The second case 5b may be a hollow structure having one end opened, the first case 5a is a plate-shaped structure, and the first case 5a is covered on the opening side of the second case 5b to form an accommodation space 5c; the first case 5a and the second case 5b may each be a hollow structure having one side opened, and the opening side of the first case 5a is closed to the opening side of the second case 5b to form the accommodation space 5c. Of course, the first casing 5a and the second casing 5b may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In order to improve the sealing property after the first casing 5a and the second casing 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may be disposed between the first casing 5a and the second casing 5 b.

Assuming that the first casing 5a is covered on top of the second casing 5b, the first casing 5a may also be referred to as an upper casing, and the second casing 5b may also be referred to as a lower casing.

In the battery 2, the number of the battery cells 6 may be one or more. If the number of the battery cells 6 is plural, the plurality of battery cells 6 may be connected in series or parallel or a series-parallel connection, and the series-parallel connection refers to that the plurality of battery cells 6 are connected in series or parallel. The plurality of battery cells 6 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 6 is accommodated in the accommodating space 5c; of course, a plurality of battery cells 6 may be connected in series or parallel or series-parallel to form a battery module, and then connected in series or parallel or series-parallel to form a whole and accommodated in the accommodating space 5c.

FIG. 3 is a schematic diagram of a box according to some embodiments of the present utility model; FIG. 4 is an enlarged schematic view of FIG. 3 at the circle; FIG. 5 is a schematic partial cross-sectional view of a tank according to some embodiments of the present utility model; fig. 6 is a schematic structural diagram of a reinforcing plate of a box according to some embodiments of the present utility model.

Referring to fig. 3 to 6, the case 7 of the embodiment of the present utility model includes a base plate 10, a beam 20, a connection member 30, and a reinforcing plate 40. The beam 20 is disposed on one side of the substrate 10, and the substrate 10 has a base material different from that of the beam 20. The connector 30 connects the base plate 10 and the beam 20. The reinforcing plate 40 is disposed on a side of the base plate 10 facing away from the beam 20 and is fixed to the base plate 10. The reinforcing plate 40 is provided with a relief structure 41, and the relief structure 41 is used to relieve the connecting member 30 so that the connecting member 30 and the reinforcing plate 40 do not overlap in the thickness direction Z of the substrate 10.

The case 7 in the embodiment of the present utility model may be an upper case of a battery or a lower case of a battery. As an example, the case 7 of the embodiment of the present utility model may be a lower case of a battery, and the substrate 10 may support the battery cell from the lower side.

The beam 20 may be disposed at a side of the substrate 10 facing the battery cells.

As an example, the case 7 includes a plurality of side beams connected to the base plate 10, which are sequentially connected and form a frame structure, and the frame structure and the base plate 10 enclose a receiving chamber that can be used to receive the battery cells.

Optionally, the case 7 further includes a reinforcing beam connected to the base plate 10, and the reinforcing beam is disposed in the accommodating cavity and connected to the side beam.

In the embodiment of the present utility model, the number of the beam bodies 20 may be one or more.

In some examples, the beam 20 is one. The beam body 20 may be a side beam or a reinforcing beam.

In other examples, the beam 20 is a plurality. In this example, the plurality of beam bodies 20 may be side beams, the plurality of beam bodies 20 may be reinforcing beams, and a part of the beam bodies 20 may be side beams, and another part of the beam bodies 20 may be reinforcing beams.

The base material of the component is the main material constituting the component, and the ratio of the base material to the material constituting the component is the highest. Illustratively, the base material of the aluminum alloy is aluminum and the base material of the nickel plated steel is steel.

The number of the connecting members 30 may be one or more.

By way of example, the connector 30 may include a fastener, which may include, but is not limited to, at least one of a screw, a stud, a rivet, a bolt. Of course, the connecting member 30 may be other standard or non-standard members capable of connecting the base plate 10 and the beam 20.

The reinforcing plate 40 may be one or a plurality of reinforcing plates. As an example, the reinforcing plates 40 may be plural, and there may be overlap between the reinforcing plates 40 or may be spaced apart from each other.

The base material of the reinforcing plate 40 may be the same as the base material of the substrate 10 or may be different from the base material of the substrate 10.

The reinforcing plate 40 may be welded, glued, snapped, fastened or otherwise secured to the base plate 10.

The relief structure 41 is a spatial structure for the relief connector 30 including, but not limited to, at least one of a hole, a slot, and a notch.

The reinforcing plate 40 may be provided with one avoiding structure 41, or may be provided with a plurality of avoiding structures 41 at the same time.

As an example, the reinforcing plate 40 is provided with a plurality of avoidance structures 41, and the shapes of the plurality of avoidance structures 41 may be the same or different. For example, a part of the relief structure 41 is a through hole, and the other part of the relief structure 41 is a groove.

One avoidance structure 41 may avoid only one connecting member 30, or may avoid more than two connecting members 30 simultaneously.

The projection of the connecting member 30 in the thickness direction Z does not overlap with the projection of the reinforcing plate 40 in the thickness direction Z.

In the embodiment of the present utility model, the connection member 30 may connect the substrate 10 and the beam 20 having different base materials, thereby increasing the connection strength of the substrate 10 and the beam 20. The reinforcing plate 40 can reinforce the strength of the region of the base plate 10 near the connector 30, and can reduce the risk of deformation and breakage of the case 7 when the battery is subjected to external impact, thereby improving the reliability of the battery. The avoidance structure 41 is arranged on the reinforcing plate 40, and the connecting piece 30 can connect the base plate 10 and the beam body 20 without contacting with the reinforcing plate 40, so that the installation difficulty of the connecting piece 30 is reduced; by providing the avoiding structure 41, a part of the space in the thickness direction Z can be shared by the reinforcing plate 40 and the connecting member 30, the overlapping of the dimensions of the reinforcing plate 40 and the connecting member 30 in the thickness direction Z can be reduced, the space utilization can be increased, and the energy density of the battery can be improved.

In some embodiments, the matrix material of the stiffener 40 is the same as the matrix material of the substrate 10. As an example, the base material of the reinforcing plate 40 and the base material of the base plate 10 are both steel.

In some embodiments, the stiffener 40 is welded to the substrate 10.

The base material of the reinforcing plate 40 is the same as that of the base material of the base plate 10, and the reinforcing plate 40 can be fixed to the base plate 10 by welding, so that the welding process is simple, and the assembly efficiency is improved.

In some embodiments, the stiffener 40 is welded to the substrate 10 to form a weld W that is spaced apart from the relief structure 41.

In the embodiment of the utility model, the welding part W and the avoidance structure 41 are arranged at intervals, so that the deformation of the avoidance structure 41 under the action of welding heat during the welding process is reduced, and the risk of interference between the reinforcing plate 40 and the connecting piece 30 is reduced.

In some embodiments, the connector 30 is provided in a plurality. The plurality of connecting pieces 30 can improve the connection strength of the substrate 10 and the beam body 20, improve the uniformity of stress of the substrate 10 and the beam body 20, and reduce stress concentration.

In some embodiments, the reinforcement plate 40 is provided with a plurality of relief structures 41, each relief structure 41 for relieving at least one of the connectors 30.

One avoidance structure 41 may avoid only one connection member 30, or may avoid more than two connection members 30 simultaneously.

Through setting up a plurality of structures 41 of dodging, can dodge a plurality of connecting pieces 30 simultaneously to reduce the installation degree of difficulty of a plurality of connecting pieces 30 simultaneously, increase space utilization, improve the energy density of battery.

In some embodiments, each relief structure 41 of the reinforcing plate 40 is for one of the connectors 30. The reinforcing plate 40 may use the space between the connection members 30 to increase the area of the reinforcing plate 40 and increase the overall strength.

In some embodiments, the relief structure 41 includes at least one of a through hole 41a and a groove 41b, the through hole 41a and the groove 41b penetrating the reinforcing plate 40 in the thickness direction Z.

As an example, the groove 41b is an open groove that opens at the edge of the reinforcing plate 40.

As an example, a part of the relief structure 41 of the reinforcing plate 40 is a through hole 41a, and the rest of the relief structure 41 is a groove 41b.

In the embodiment of the present utility model, the through holes 41a and the grooves 41b are simple in structure and easy to mold.

In some embodiments, at least one relief structure 41 is a through hole, and the projection of one connector 30 is located within the projection of the through hole in the thickness direction Z.

In some embodiments, the case 7 includes a plurality of reinforcing plates 40.

The plurality of reinforcing plates 40 may have the same shape or different shapes. Illustratively, the position of the reinforcing plate 40 may be set as desired.

The plurality of reinforcing plates 40 can increase the overall strength of the case 7 and improve the reliability of the battery.

In some embodiments, the plurality of reinforcing plates 40 includes a first reinforcing plate 40a and a second reinforcing plate 40b.

As an example, a part of the plurality of reinforcing plates 40 is referred to as a first reinforcing plate 40a, and another part of the plurality of reinforcing plates 40 is referred to as a second reinforcing plate 40b.

The number of the first reinforcing plates 40a may be one or a plurality. The number of the second reinforcing plates 40b may be one or more.

In some embodiments, the first reinforcing plate 40a and the second reinforcing plate 40b partially overlap in the thickness direction Z.

A portion of the first reinforcing plate 40a overlaps a portion of the second reinforcing plate 40b in the thickness direction Z. Illustratively, a portion of the second reinforcing plate 40b is located on a side of the first reinforcing plate 40a facing away from the substrate 10 in the thickness direction Z.

In the region where the first reinforcing plate 40a and the second reinforcing plate 40b overlap, the first reinforcing plate 40a and the second reinforcing plate 40b may be fixedly connected or may be in contact only.

Overlapping the first reinforcing plate 40a and the second reinforcing plate 40b can further improve the strength of a part of the case 7 and improve the reliability of the case 7.

In some embodiments, the first reinforcing plate 40a is bent and forms an arch structure. When the battery is subjected to external impact, the arch structure can release stress through deformation, so that the risk of deformation and fracture of the box body 7 is reduced

In some embodiments, the second reinforcing plate 40b is a flat plate structure. The flat plate structure is easy to form and occupies a small space in the thickness direction Z.

In some embodiments, in the region where the first reinforcing plate 40a overlaps the second reinforcing plate 40b, the first reinforcing plate 40a and the second reinforcing plate 40b are each provided with the escape structure 41, and the escape structure 41 of the first reinforcing plate 40a overlaps the escape structure 41 of the second reinforcing plate 40b at least partially in the thickness direction Z.

In the overlapping area of the first reinforcing plate 40a and the second reinforcing plate 40b, the avoidance structure 41 of the first reinforcing plate 40a and the avoidance structure 41 of the second reinforcing plate 40b may avoid the connecting member 30 at the same time, thereby reducing the installation difficulty of the connecting member 30, increasing the space utilization ratio, and improving the energy density of the battery.

In some embodiments, the relief structure 41 of the first reinforcing plate 40a may be referred to as a first relief structure and the relief structure 41 of the second reinforcing plate 40b may be referred to as a second relief structure in the region where the first reinforcing plate 40a overlaps the second reinforcing plate 40b.

The first relief structure and the second relief structure, which are opposite in the thickness direction Z, serve to relieve the same connecting element 30.

In some embodiments, the first reinforcing plate 40a is fixedly coupled to the second reinforcing plate 40b at a region where the first reinforcing plate 40a overlaps the second reinforcing plate 40b. Alternatively, the first reinforcing plate 40a is welded with the second reinforcing plate 40b at the region where the first reinforcing plate 40a overlaps with the second reinforcing plate 40b.

In some embodiments, the base material of the base plate 10 is steel and the base material of the beam 20 is aluminum. Aluminum has a small weight, and the adoption of the aluminum beam body 20 can reduce the weight of the whole box body 7 and improve the energy density of the battery. The steel has higher structural strength, is difficult to deform when being impacted externally, and the base plate 10 made of steel can protect the battery cells and reduce the safety risk.

In addition, the cost of the steel material is low, and the cost of the battery can be reduced by using the steel substrate 10.

In some embodiments, the material of the substrate 10 is steel. Optionally, the material of the substrate 10 is HC980QP or HC980DP high-strength steel.

In some embodiments, the material of the beam 20 is an aluminum alloy.

FIG. 7 is an enlarged schematic view of FIG. 5 at the circle; fig. 8 is a cross-sectional view of a connector for a case according to some embodiments of the present utility model.

Referring to fig. 5-8, in some embodiments, the connector 30 includes a fastener 31, the fastener 31 includes a head 311 and a threaded rod 312, the head 311 is located on a side of the base plate 10 facing away from the beam 20, and the threaded rod 312 extends from the head 311, through the base plate 10, and is threadably coupled to the beam 20.

The fastener 31 can connect the base plate 10 and the beam 20 having different base materials, thereby increasing the connection strength of the base plate 10 and the beam 20. The fastener 31 is a common piece and is relatively inexpensive.

In some embodiments, the connector 30 further comprises a first seal 32, the first seal 32 being clamped between the head 311 and the substrate 10.

By providing the first seal 32, the sealing performance of the case 7 at the fastener 31 can be improved. The fastening member 31 does not need to be connected with the reinforcing plate 40, and therefore, the reinforcing plate 40 does not need to participate in sealing, thereby simplifying the structure of the case 7 and reducing the sealing difficulty.

In some embodiments, the first seal 32 is bonded to the head 311.

The first seal 32 is adhered to the head 311, which can be mounted to the base plate 10 together with the fastener 31, thereby improving assembly efficiency. The first sealing member 32 may be pre-attached to the fastener 31 and then fed together, which may save time and cost.

In some embodiments, the fastener 31 comprises a self-tapping screw. The self-tapping screw is simple in installation process and high in assembly efficiency.

In some embodiments, the self-tapping screw is connected to the base plate 10 and the beam 20 through a FDS (Flow Drill Srew) process.

In some embodiments, the thickness of the substrate 10 is less than 0.6mm. The area of the base plate 10 for mounting the tapping screw may be formed without holes, and the tapping screw may pass directly through the base plate 10.

In other embodiments, the thickness of the substrate 10 is greater than or equal to 0.6mm. Holes may be previously formed in the base plate 10, and then self-tapping screws may be installed in the perforated areas. Through the pre-perforating, the installation difficulty of the self-tapping screw can be reduced.

In some embodiments, the box 7 further includes a second seal 50, the second seal 50 being disposed between the base plate 10 and the beam 20 and surrounding the threaded rod 312.

By providing the second seal member 50, the gap between the substrate 10 and the beam 20 can be sealed, and the sealing performance of the case 7 can be improved.

In some embodiments, the second seal 50 is cured from a sealant.

Illustratively, a sealant may be applied between the substrate 10 and the beam 20 when the substrate 10 and the beam 20 are assembled. Alternatively, the sealant-coated area may be determined according to the installation position of the fastener 31.

In some embodiments, the tapping screw is only engaged with the base plate 10 and the beam 20, which can reduce the difficulty of installing the tapping screw.

In some embodiments, the total dimension of the area where the tapping screw engages with the base plate 10 and the area where the tapping screw engages with the beam body 20 is less than or equal to 7.5mm in the thickness direction Z.

In some embodiments, the beam 20 has a hollow structure, and the tapping screw may engage with only the outer peripheral wall of the beam 20.

In some embodiments, the reinforcement plate 40 need not be engaged with the tapping screw, and its thickness may be designed as desired, without regard to the mounting requirements of the tapping screw.

According to some embodiments of the present utility model, the present utility model also provides a battery, which includes a battery cell and the case 7 provided in any of the above embodiments. The battery cell is disposed on a side of the substrate 10 facing the beam 20.

The substrate 10 may protect the battery cells.

In some embodiments, the case 7 is a lower case, and the substrate 10 may support the battery cells.

According to some embodiments of the present utility model, there is also provided an electric device including the battery provided in any of the above embodiments, the battery being configured to provide electric energy.

Referring to fig. 3 to 8, an embodiment of the present utility model provides a case 7 of a battery, which includes a base plate 10, a beam 20, a plurality of connection members 30, and a plurality of reinforcing plates 40.

The beam 20 is disposed on a side of the substrate 10 facing the battery cells. The material of the base plate 10 is steel, and the material of the beam body 20 is aluminum alloy.

The connection member 30 includes a self-tapping screw and a first sealing member 32, the self-tapping screw being connected to the base plate 10 and the beam body 20 through a FDS (Flow Drill Srew) process to firmly connect the base plate 10 and the beam body 20. The first seal 32 is bonded to the head 311 of the tapping screw and is sandwiched between the head 311 and the substrate 10.

The box 7 further includes a second seal 50, the second seal 50 being disposed between the base plate 10 and the beam 20 and surrounding the threaded shaft 312 of the tapping screw.

The reinforcing plate 40 is disposed on a side of the substrate 10 facing away from the beam 20 and welded to the substrate 10. The reinforcing plate 40 is provided with a relief structure 41, and the relief structure 41 is used to relieve the connecting member 30 so that the connecting member 30 and the reinforcing plate 40 do not overlap in the thickness direction Z of the substrate 10. Illustratively, the relief structure 41 is used to relieve the head 311 of the self-tapping screw and the first seal 32.

The plurality of reinforcing plates 40 includes a first reinforcing plate 40a and a second reinforcing plate 40b. In the thickness direction Z, the first reinforcing plate 40a and the second reinforcing plate 40b partially overlap. In the region where the first reinforcing plate 40a and the second reinforcing plate 40b overlap, the first reinforcing plate 40a and the second reinforcing plate 40b are each provided with the avoidance structure 41, and the avoidance structure 41 of the first reinforcing plate 40a and the avoidance structure 41 of the second reinforcing plate 40b overlap at least partially in the thickness direction Z to avoid the head 311 of the tapping screw and the first seal 32.

While the utility model has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model, and in particular, the technical features set forth in the various embodiments may be combined in any manner so long as there is no structural conflict. The present utility model is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (14)

1. A battery case comprising:

a substrate;

a beam body provided on one side of the substrate, wherein a base material of the substrate is different from a base material of the beam body;

a connecting member connecting the substrate and the beam body; and

the reinforcing plate is arranged on one side, deviating from the beam body, of the base plate and is fixed on the base plate, the reinforcing plate is provided with an avoidance structure, and the avoidance structure is used for avoiding the connecting piece, so that the connecting piece and the reinforcing plate are not overlapped in the thickness direction of the base plate.

2. The cabinet of claim 1, wherein the base material of the reinforcing plate is the same as the base material of the base plate, and the reinforcing plate is welded to the base plate.

3. The case of claim 2, wherein the reinforcing plate is welded to the base plate to form a welded portion, and the welded portion is spaced apart from the relief structure.

4. The cabinet according to claim 1, wherein the connection members are provided in plurality;

the reinforcing plate is provided with a plurality of avoidance structures, and each avoidance structure is used for avoiding at least one connecting piece.

5. The case according to claim 1, wherein the relief structure includes at least one of a through hole and a groove penetrating through the reinforcing plate in the thickness direction.

6. The cabinet of claim 1, wherein the cabinet comprises a plurality of the reinforcing plates, the plurality of reinforcing plates comprising a first reinforcing plate and a second reinforcing plate;

in the thickness direction, the first reinforcing plate and the second reinforcing plate partially overlap.

7. The case according to claim 6, wherein the first reinforcing plate and the second reinforcing plate are each provided with the avoidance structure in a region where the first reinforcing plate and the second reinforcing plate overlap, and the avoidance structure of the first reinforcing plate and the avoidance structure of the second reinforcing plate overlap at least partially in the thickness direction.

8. The case of claim 1, wherein the connector comprises a fastener and a first seal, the fastener comprising a head and a threaded rod, the head being located on a side of the base plate facing away from the beam, the threaded rod extending from the head, through the base plate, and threadably coupled to the beam;

the first seal is clamped between the head and the substrate.

9. The case of claim 8, wherein the first seal is bonded to the head.

10. The case of claim 8, wherein the fastener comprises a self-tapping screw.

11. The case of claim 8, further comprising a second seal disposed between the base plate and the beam and surrounding the threaded rod.

12. The cabinet of claim 1, wherein the base material of the base plate is steel and the base material of the beam body is aluminum.

13. A battery, comprising:

the tank according to any one of claims 1 to 12; and

and the battery monomer is arranged on one side of the substrate facing the beam body.

14. An electrical device comprising a battery according to claim 13 for providing electrical energy.