CN220189809U - Box assembly of battery, battery and power utilization device - Google Patents

Abstract

The utility model discloses a box body assembly of a battery, the battery and an electric device. The box assembly comprises a box body and a guard plate. The box is equipped with the chamber that holds that is used for holding battery monomer, and the box includes first wall, and first wall includes wall main part and first convex part, and first convex part protrusion deviates from the surface that holds the chamber in the wall main part. The shield is attached to the first wall. The backplate includes backplate main part and second convex part, and the backplate main part is located one side that the first wall deviates from the chamber of holding, and the second convex part is protruding in backplate main part surface towards the first wall, and the second convex part offsets with first convex part in the thickness direction of first wall, backplate form the concave part in the position that corresponds with the second convex part, and the concave part is sunken for the surface that the backplate main part deviates from the first wall.

Description

Box assembly of battery, battery and power utilization device

Technical Field

The present utility model relates to the field of batteries, and in particular, to a battery case assembly, 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 box assembly, a battery and an electric device, which can improve the reliability of the battery.

In a first aspect, the present utility model provides a battery case assembly including a case and a cover. The box is equipped with the chamber that holds that is used for holding battery monomer, and the box includes first wall, and first wall includes wall main part and first convex part, and first convex part protrusion deviates from the surface that holds the chamber in the wall main part. The shield is attached to the first wall. The backplate includes backplate main part and second convex part, and the backplate main part is located one side that the first wall deviates from the chamber of holding, and the second convex part is protruding in backplate main part surface towards the first wall, and the second convex part offsets with first convex part in the thickness direction of first wall, backplate form the concave part in the position that corresponds with the second convex part, and the concave part is sunken for the surface that the backplate main part deviates from the first wall.

The second convex part and the concave part are formed on the guard plate, so that a convex hull structure with an inward convex part and an outward concave part can be formed on the guard plate, and the strength of the guard plate is improved; when the guard plate is impacted by external impurities, the second convex part can absorb energy through deformation, so that a buffer effect is achieved, the protective performance of the guard plate is improved, and the protective effect of the guard plate is improved. When the external impurities impact the second convex part through the concave part, the second convex part can transmit the impact force to other parts of the first wall through the first convex part, so that the stress is dispersed, and the impact received by the battery cell is reduced. The first wall is equipped with the position intensity of second convex part higher, non-deformable also can reduce the impact force that battery monomer received to reduce the impaired risk of battery monomer, improve the reliability.

In some embodiments, the second protrusion is annular. The annular second convex portion has higher strength, and can bear higher impact force. On the premise that the strength meets the requirement, the annular second convex part has smaller size, so that the difficulty of entering the concave part by external impurities can be increased, and the risk of the second convex part being impacted is reduced.

In some embodiments, the second protrusion is annular. The annular second convex part can bear the impact of the spherical structure better.

In some embodiments, the second protrusion has a loop width of 0.5mm to 10mm. The embodiment of the utility model can reduce the risk of direct impact of external impurities on the second convex part, reduce the impact on the battery monomer and improve the manufacturability of the guard plate.

In some embodiments, an end of the first protrusion facing the second protrusion has a first end face, and an end of the second protrusion facing the first protrusion has a second end face. In the thickness direction, the whole first end face is abutted against the second end face.

The whole first end face can support the second convex part, and the contact area between the first end face and the second end face is maximized, so that impact force is effectively dispersed, and impact on the battery cell is reduced.

In some embodiments, the first projection projecting wall body has a dimension H1 and the second projection projecting shield body has a dimension H2 in the thickness direction. H1 and H2 satisfy 0.5 and be less than or equal to H1/H2 and be less than or equal to 2, can improve the deformation energy-absorbing effect of second convex part to reduce the stress that transmits to the battery monomer, reduce the risk of battery monomer damage, improve the reliability.

In some embodiments, the first wall further comprises a reinforcing rib protruding from a surface of the wall body facing away from the accommodating cavity, and a dimension of the reinforcing rib protruding from the wall body in the thickness direction is larger than a dimension of the first protrusion protruding from the wall body. The reinforcing rib is propped against the guard plate main body.

By arranging the reinforcing ribs, the structural strength of the first wall can be further enhanced, the deformation of the first wall is reduced when external impact is received, and the reliability of the battery is improved. When outside impurity strikes backplate main part, the strengthening rib can support the backplate main part, reduces the deformation of backplate main part, reduces backplate main part and is close to the free risk of battery to protect the battery monomer effectively, improve the reliability of battery.

In some embodiments, the stiffener is formed with a plurality of receiving recesses surrounding the wall body, each receiving recess being recessed from a surface of the stiffener facing the apron body. The at least one accommodation recess accommodates the first protrusion and the second protrusion therein.

By utilizing the accommodation recess to avoid the first protrusion and the second protrusion, the space utilization ratio can be improved, the maximum size of the battery in the thickness direction can be reduced, and the energy density can be improved.

In some embodiments, the stiffener is honeycomb-shaped. The honeycomb-shaped reinforcing ribs can improve the strength of the first wall and reduce the shrinkage stress when the first wall is cast.

In some embodiments, the first protrusion and the second protrusion are each plural, and the first protrusion and the second protrusion are disposed in one-to-one correspondence.

Through setting up a plurality of first convex parts and a plurality of second convex parts, can promote the barrier propterty in backplate a plurality of positions, reduce the impaired risk of battery monomer, improve the reliability. The first convex parts and the second convex parts are arranged in one-to-one correspondence, so that the forming process and the assembling process of the box body and the guard plate can be simplified.

In some embodiments, the first protrusion is a solid structure. The first convex part of the solid structure has higher strength, and is not easy to deform when the impact force from the second convex part is transmitted, so that the impact force received by the battery cell is reduced, the risk of damaging the battery cell is reduced, and the reliability is improved.

In some embodiments, the case assembly further includes a protective layer covering a surface of the apron body facing away from the first wall and a wall surface of the recess. The protective layer can protect the guard plate, reduces the scratch that the guard plate produced under the impact of external impurity, reduces the risk of guard plate corruption, improves the protective effect of guard plate, improves the reliability of battery.

In a second aspect, the present utility model provides a battery, which includes a battery cell and a case assembly provided according to any one of the embodiments of the first aspect, wherein the battery cell is accommodated in the accommodating cavity.

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 second 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 cross-sectional view of a battery provided in some embodiments of the utility model;

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

FIG. 5 is a schematic diagram of a box assembly according to some embodiments of the present utility model;

FIG. 6 is an enlarged schematic view of FIG. 5 at the circle;

FIG. 7 is a schematic perspective view of a guard plate and a protective layer of a tank assembly according to some embodiments of the present utility model;

FIG. 8 is an enlarged schematic view of FIG. 7 at the circle;

FIG. 9 is a schematic partial cross-sectional view of a shield for a tank assembly according to some embodiments of the present utility model.

The reference numerals are as follows:

1. a vehicle; 2. a battery; 3. a controller; 4. a motor; 5. a battery module; 6. a housing assembly; 7. a battery cell;

10. a case; 10a, a first box body; 10b, a second box body; 10c, an accommodating space;

11. a first wall; 111. a wall body; 112. a first convex portion; 112a, a first end face; 113. reinforcing ribs; 114. a receiving recess; 12. a second wall; 13. a receiving chamber;

20. a guard board; 21. a guard plate main body; 22. a second convex portion; 22a, a second end face; 23. a concave portion;

30. a protective layer;

z, thickness direction.

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 "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; 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).

Reference to a battery in accordance with an embodiment of the present utility model refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

The battery cell may be a secondary battery cell, and the secondary battery cell refers to a battery cell that can activate an active material by charging after discharging the battery cell and continue to use.

The battery cell can be lithium ion battery cell, sodium lithium ion battery cell, lithium metal battery cell, sodium metal battery cell, lithium sulfur battery cell, magnesium ion battery cell, nickel-hydrogen battery cell, nickel-cadmium battery cell, lead storage battery cell, etc.

In some embodiments, the battery further includes a first case and a second case, the first case and the second case being mutually covered, the first case and the second case together defining an accommodation space for accommodating the battery cell.

Because the use scenarios of different electric devices are different, when the battery is applied to different electric devices, the battery is required to be able to adapt to various severe use scenarios. For example, when the battery is applied to an electric vehicle, driving road conditions and use situations of the electric vehicle are very diverse and complex. Batteries are typically mounted on the floor of an electric vehicle, which places higher demands on the protection of the batteries.

In some embodiments, the battery is typically provided with a guard plate disposed outside of the first case or outside of the second case. The guard plate can bear external impact to protect battery cells in the battery so as to improve the reliability of the battery.

In order to improve the strength of the guard plate, a convex hull structure with an inward convex shape and an outward concave shape is usually arranged on the guard plate. However, the convex hull structure protrudes inward, which may cause a decrease in the minimum distance between the convex hull structure and the battery cell; when external impurities (e.g., spherical particles) impact the convex hull structure, there is a risk of damaging the battery cells.

In view of this, embodiments of the present utility model provide a case assembly including a case and a protector plate provided to the case. The wall of the box body is provided with a convex part which is propped against the convex hull structure of the guard plate. When the convex hull structure is impacted externally, the convex hull can transmit impact force to other positions of the tank wall, and the impact force suffered by the battery monomer is dispersed. The strength of the position of the box wall, which is provided with the convex part, is higher, the deformation is difficult, and the impact force received by the battery monomer can be reduced, so that the risk of damaging the battery monomer is reduced, and the reliability is improved.

The box body assembly 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, in some embodiments, the battery 2 includes a first case 10a, a second case 10b, and a battery cell (not shown). The first casing 10a and the second casing 10b are covered with each other, and the first casing 10a and the second casing 10b together define an accommodating space 10c for accommodating the battery cell.

In some embodiments, the second case 10b may be a hollow structure having one end opened, the first case 10a is a plate-shaped structure, and the first case 10a is covered on an opened side of the second case 10b to form the receiving space 10c. In other embodiments, the first case 10a and the second case 10b may each have a hollow structure with one side opened, and the opening side of the first case 10a is closed to the opening side of the second case 10b to form the receiving space 10c.

The first casing 10a and the second casing 10b may be various shapes, such as a cylinder, a rectangular parallelepiped, etc.

In some embodiments, a seal (not shown), such as a sealant, a gasket, or the like, may also be disposed between the first and second cases 10a and 10 b. The sealing member can improve the sealability after the first casing 10a is connected with the second casing 10 b.

In some embodiments, the first casing 10a covers the top of the second casing 10 b. The first case 10a may be referred to as an upper case cover, and the second case 10b may be referred to as a lower case.

In the battery 2, the number of battery cells may be one or more. If the number of the battery cells is multiple, the multiple battery cells can be connected in series or in parallel or in series-parallel connection, and the series-parallel connection means that the multiple battery cells are connected in series or in parallel.

The plurality of battery cells can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells is accommodated in the accommodating space 10 c; of course, a plurality of battery cells may be connected in series or parallel or in series to form the battery module 5, and then the plurality of battery modules 5 may be connected in series or parallel or in series to form a whole and be accommodated in the accommodating space 10c.

As an example, the battery cell may be a prismatic battery cell, a pouch battery cell, or other shaped battery cell, including a square case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, etc., and the present utility model is not particularly limited.

FIG. 3 is a schematic cross-sectional view of a battery provided in some embodiments of the utility model; FIG. 4 is an enlarged schematic view of FIG. 3 at the circle; FIG. 5 is a schematic diagram of a box assembly according to some embodiments of the present utility model; FIG. 6 is an enlarged schematic view of FIG. 5 at the circle; FIG. 7 is a schematic perspective view of a guard plate and a protective layer of a tank assembly according to some embodiments of the present utility model; FIG. 8 is an enlarged schematic view of FIG. 7 at the circle; FIG. 9 is a schematic partial cross-sectional view of a shield for a tank assembly according to some embodiments of the present utility model.

Referring to fig. 3 to 9, the embodiment of the present utility model provides a case assembly 6 of a battery 2, which includes a case 10 and a sheathing plate 20. The case 10 is provided with a housing chamber 13 for housing the battery cells 7, the case 10 includes a first wall 11, the first wall 11 includes a wall main body 111 and a first protrusion 112, and the first protrusion 112 protrudes from a surface of the wall main body 111 facing away from the housing chamber 13. The shield 20 is attached to the first wall 11. The protector plate 20 includes a protector plate body 21 and a second convex portion 22, the protector plate body 21 is located on a side of the first wall 11 facing away from the accommodation chamber 13, the second convex portion 22 projects from a surface of the protector plate body 21 facing the first wall 11, the second convex portion 22 abuts against the first convex portion 112 in a thickness direction Z of the first wall 11, the protector plate 20 forms a concave portion 23 at a position corresponding to the second convex portion 22, and the concave portion 23 is recessed with respect to the surface of the protector plate body 21 facing away from the first wall 11.

The first wall 11 may be a bottom wall of the case 10 or may be a side wall of the case 10.

The case 10 may be an integrally formed structure. Alternatively, the case 10 may be formed by connecting a plurality of separately formed parts.

The box 10 of the box assembly 6 may be an upper box cover or a lower box. As an example, the case 10 of the case assembly 6 is a lower case, and the guard plate 20 is provided at the lower side of the case 10. Alternatively, the wall body 111 supports the battery cell 7 from the lower side.

The battery cell 7 may be housed in the housing chamber 13 as a whole, or may be housed only partially in the housing chamber 13.

The first protrusion 112 may be a solid structure or a hollow structure.

The number of the first protrusions 112 may be one or a plurality of. Each first convex portion 112 abuts against at least one second convex portion 22 in the thickness direction Z.

The number of the second protrusions 22 may be one or a plurality of. Each second convex portion 22 abuts against at least one first convex portion 112 in the thickness direction Z.

As an example, the first convex portion 112 is one, the second convex portion 22 is one, and the first convex portion 112 and the second convex portion 22 are abutted in the thickness direction Z.

As an example, there are one first protrusion 112 and a plurality of second protrusions 22, and one first protrusion 112 is simultaneously abutted against a plurality of second protrusions 22 in the thickness direction Z.

As an example, there are a plurality of first protrusions 112, one second protrusion 22, and one second protrusion 22 simultaneously abuts against the plurality of first protrusions 112 in the thickness direction Z.

As an example, the first protruding portions 112 are plural, the second protruding portions 22 are plural, and the plural second protruding portions 22 are provided corresponding to the plural first protruding portions 112. Alternatively, the number of the first protrusions 112 is the same as the number of the second protrusions 22, and the first protrusions 112 and the second protrusions 22 are disposed in one-to-one correspondence.

The shape of the first convex portion 112 may be annular, circular, rectangular, trapezoidal, triangular, elliptical, elongated, or other shape as viewed in the thickness direction Z.

The shape of the second convex portion 22 may be annular, circular, rectangular, trapezoidal, triangular, elliptical, elongated, or other shape as viewed in the thickness direction Z.

The shape of the first convex portion 112 may be the same as or different from the shape of the second convex portion 22 as viewed in the thickness direction Z.

The apron body 21 may be welded, glued, snapped, fastened or otherwise attached to the first wall 11.

In the embodiment of the utility model, the second convex part 22 and the concave part 23 are arranged on the guard plate 20, so that a convex hull structure with inward convex and outward concave can be formed on the guard plate 20, thereby improving the strength of the guard plate 20; when the guard plate 20 is impacted by external impurities, the second convex part 22 can absorb energy through deformation, so that the buffer effect is achieved, the protective performance of the guard plate 20 is improved, and the protective effect of the guard plate 20 is improved. The first convex portion 112 abuts against the second convex portion 22 in the thickness direction Z, and when an external impurity impacts the second convex portion 22 through the concave portion 23, the second convex portion 22 can transmit the impact force to other portions of the first wall 11 through the first convex portion 112, thereby dispersing the stress and reducing the impact received by the battery cell 7. The strength of the first wall 11 where the second protruding portion 22 is provided is high, so that the battery cell 7 is not easy to deform, the impact force applied to the battery cell 7 can be reduced, the risk of damage to the battery cell 7 is reduced, and the reliability is improved.

In some embodiments, the shape of the second protrusion 22 corresponds to the shape of the recess 23. Alternatively, the second protrusions 22 and recesses 23 may be formed by punching the cover sheet 20.

In some embodiments, the second protrusion 22 is annular.

The shape of the second convex portion 22 may exemplarily refer to a shape when the second convex portion 22 is viewed in the thickness direction Z. In other words, the projection of the second convex portion 22 in the thickness direction Z is annular.

The second protrusion 22 may be a circular ring, an elliptical ring, a polygonal ring, or other annular structures. Alternatively, polygonal rings include, but are not limited to, rectangular rings, trapezoidal rings, triangular rings, pentagonal rings, and hexagonal rings.

The annular second projection 22 has a higher strength, which can withstand higher impact forces. On the premise that the strength meets the requirement, the annular second convex part 22 has a smaller size, so that the difficulty of entering the concave part 23 by external impurities can be increased, and the risk of the second convex part 22 being impacted is reduced.

In some embodiments, the recess 23 is annular.

Illustratively, the shape of the recess 23 may refer to a shape when the recess 23 is viewed in the thickness direction Z. In other words, the projection of the concave portion 23 in the thickness direction Z is annular.

In some embodiments, the second protrusion 22 is annular. The annular second convex portion 22 can better withstand the impact of the spherical structure.

In some embodiments, the recess 23 is annular.

In some embodiments, the loop width D1 of the second protrusion 22 is 0.5mm-10mm.

Illustratively, the annular width D1 may be the maximum annular width of the annular projection of the second convex portion 22 in the thickness direction Z.

The smaller the value of the ring width D1, the higher the difficulty of molding the second convex portion 22, but the lower the risk of the external impurities directly striking the second convex portion 22; the larger the ring width D1 is, the lower the difficulty in molding the second convex portion 22 is, but the higher the risk that external impurities directly strike the second convex portion 22 is.

The embodiment of the utility model sets the ring width D1 of the second convex part 22 to be 0.5mm-10mm, which can reduce the risk of direct impact of external impurities on the second convex part 22, reduce the impact received by the battery cell 7 and improve the manufacturability of the guard plate 20.

Alternatively, the ring width D1 of the second protrusion 22 is 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

In some embodiments, the loop width D1 of the second protrusion 22 is 1mm-4mm.

In some embodiments, the annular width D2 of the recess 23 is 0.5mm-10mm. Illustratively, the annular width D2 may be the maximum annular width of the annular projection of the recess 23 in the thickness direction Z.

Alternatively, the annular width D2 of the recess 23 is 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

The smaller the value of the ring width D2, the more difficult the molding of the concave portion 23, but the lower the risk of external impurities entering the concave portion 23; the larger the ring width D2 is, the lower the difficulty in molding the concave portion 23 is, but the higher the risk of foreign matters directly entering the concave portion 23 is.

The embodiment of the utility model sets the ring width D2 of the concave portion 23 to be 0.5mm-10mm, which can reduce the risk of external impurities directly entering the concave portion 23, reduce the impact to the battery cell 7, and improve the manufacturability of the guard plate 20.

In some embodiments, an end of the first protrusion 112 facing the second protrusion 22 has a first end face 112a, and an end of the second protrusion 22 facing the first protrusion 112 has a second end face 22a. The first end surface 112a abuts against the second end surface 22a in the thickness direction Z.

The first convex portion 112 is in surface-to-surface contact with the second convex portion 22, and the force transmission area can be increased, so that the impact force can be dispersed more effectively.

In some embodiments, the first end face 112a is planar and the second end face 22a is planar. Alternatively, both the first end face 112a and the second end face 22a are perpendicular to the thickness direction Z.

In some embodiments, the first end face 112a is entirely abutted against the second end face 22a in the thickness direction Z.

In the thickness direction Z, the projection of the first end face 112a is located within the projection of the second end face 22a.

The second end surface 22a may have an area larger than that of the first end surface 112a or may be equal to that of the first end surface 112 a.

In the embodiment of the utility model, the first end surface 112a can support the second protruding portion 22 as a whole, and the contact area between the first end surface 112a and the second end surface 22a is maximized, so that the impact force is effectively dispersed, and the impact received by the battery cell 7 is reduced.

In some embodiments, the second end face 22a has an area that is greater than the area of the first end face 112 a. The embodiment of the utility model can reduce the risk that the partial area of the first end surface 112a cannot be propped against the second end surface 22a due to assembly errors.

In some embodiments, in the thickness direction Z, the first convex portion 112 protrudes by the dimension H1 of the wall body 111, and the second convex portion 22 protrudes by the dimension H2 of the shield body 21. H1 and H2 satisfy: H1/H2 is more than or equal to 0.5 and less than or equal to 2.

The greater the value of H1/H2, the higher the strength of the first convex portion 112, and the smaller the amount of deformability of the second convex portion 22 when the shield main body 21 is subjected to an external impact. The smaller the value of H1/H2, the smaller the minimum distance between the second convex portion 22 and the battery cell 7, and the lower the strength of the first convex portion 112.

According to the embodiment of the utility model, the H1/H2 is set to be 0.5-2, so that the deformation energy absorption effect of the second convex part 22 can be improved, the stress transmitted to the battery cell 7 is reduced, the risk of damaging the battery cell 7 is reduced, and the reliability is improved.

Alternatively, H1/H2 may be 0.5, 0.8, 1, 1.2, 1.5, 1.8 or 2.

In some embodiments, the first protrusion 112 and the second protrusion 22 are each a plurality. By providing the plurality of first protrusions 112 and the plurality of second protrusions 22, the protection performance of the guard plate 20 at a plurality of positions can be improved, the risk of damage to the battery cells 7 can be reduced, and the reliability can be improved.

Illustratively, the number and location of the second protrusions 22 may be set according to the shielding design requirements.

In some embodiments, the first protrusions 112 and the second protrusions 22 are disposed in a one-to-one correspondence. The one-to-one correspondence arrangement can simplify the molding process and the assembling process of the case 10 and the guard plate 20.

In some embodiments, the first protrusion 112 is a solid structure. The first convex portion 112 of the solid structure has higher strength, which is not easily deformed when the impact force from the second convex portion 22 is transmitted, thereby reducing the impact force received by the battery cell 7, thereby reducing the risk of damage to the battery cell 7, and improving reliability.

In some embodiments, the first wall 11 further comprises ribs 113, the ribs 113 protruding from the surface of the wall body 111 facing away from the receiving cavity 13.

The ribs 113 may be bar-shaped, cross-shaped, rectangular, honeycomb-shaped, or other shapes.

The number of the reinforcing ribs 113 may be one or a plurality of.

The dimension of the reinforcing ribs 113 protruding from the wall main body 111 in the thickness direction Z may be greater than, equal to, or smaller than the dimension of the first protrusions 112 protruding from the wall main body 111.

By providing the reinforcing ribs 113, the structural strength of the first wall 11 can be further enhanced, deformation of the first wall 11 can be reduced when an external impact is applied, and reliability of the battery 2 can be improved.

In some embodiments, the dimension of the rib 113 protruding from the wall body 111 in the thickness direction Z is larger than the dimension of the first protrusion 112 protruding from the wall body 111. The stiffener 113 abuts against the apron body 21.

When external impurities impact the guard plate main body 21, the reinforcing ribs 113 can support the guard plate main body 21, reduce deformation of the guard plate main body 21, and reduce risks that the guard plate main body 21 is close to the battery cells 7, so that the battery cells 7 are effectively protected, and reliability of the battery 2 is improved.

In some embodiments, the rib 113 and the wall body 111 are surrounded by a plurality of receiving recesses 114, each receiving recess 114 being recessed from a surface of the rib 113 facing the apron body 21. The first convex portion 112 and the second convex portion 22 are accommodated in the at least one accommodation concave portion 114.

In the present embodiment, only one accommodation recess 114 accommodates the first convex portion 112 and the second convex portion 22, or a part of the accommodation recess 114 accommodates the first convex portion 112 and the second convex portion 22, or each accommodation recess 114 accommodates the first convex portion 112 and the second convex portion 22.

In the present embodiment, one accommodation recess 114 may accommodate only one first protrusion 112 and one second protrusion 22, or may accommodate a plurality of first protrusions 112 and a plurality of second protrusions 22 at the same time.

The embodiment of the utility model uses the accommodating concave part 114 to avoid the first convex part 112 and the second convex part 22, thereby improving the space utilization rate, reducing the maximum size of the battery 2 in the thickness direction Z and improving the energy density.

In some embodiments, portions of the receiving recess 114 receive the first and second protrusions 112, 22 therein, with each receiving recess 114 receiving only one first and second protrusion 112, 22.

In some embodiments, the stiffener 113 is honeycomb-shaped. The honeycomb-shaped ribs 113 can improve the strength of the first wall 11 and reduce the shrinkage stress at the time of casting the first wall 11.

In some embodiments, the case 10 further includes a second wall 12 connected to the first wall 11.

In some embodiments, the second walls 12 are plural, the plural second walls 12 are sequentially connected and form a frame structure, and the first wall 11 is connected to the plural second walls 12 and forms a containing cavity 13 with the second walls 12.

In some embodiments, the case 10 is an integrally formed structure. Alternatively, the case 10 is integrally formed through a casting process.

In some embodiments, the first wall 11 is a bottom wall of the case 10. The guard plate 20 may be a bottom guard plate of the battery 2.

In some embodiments, the tank assembly 6 further includes a protective layer 30 covering the surface of the apron body 21 facing away from the first wall 11 and the wall surface of the recess 23.

The protective layer 30 can protect the protective plate 20, reduce scratches generated by the protective plate 20 under the impact of external impurities, reduce the risk of corrosion of the protective plate 20, improve the protective effect of the protective plate 20, and improve the reliability of the battery 2.

In some embodiments, the shield 20 is made of metal. Optionally, the guard plate 20 is a steel plate.

In some embodiments, the material of the protective layer 30 may be polyvinyl chloride (PVC).

According to some embodiments of the present utility model, the present utility model further provides a battery 2, which includes the case assembly 6 of any of the above embodiments and the battery cell 7, where the battery cell 7 is accommodated in the accommodating cavity 13.

In some embodiments, the battery cells 7 are multiple.

In some embodiments, the battery 2 further includes an upper case cover fixed to the case 10 and enclosing with the case 10 to form a receiving space for receiving the plurality of battery cells 7.

According to some embodiments of the present utility model, the present utility model also provides an electric device, which includes the battery 2 of any one of the above embodiments, and the battery 2 is used to provide electric energy for the electric device. The powered device may be any of the aforementioned devices or systems employing the battery 2.

Referring to fig. 3-9, an embodiment of the present utility model provides a tank assembly 6 that includes a tank 10 and a shield 20.

The case 10 is a lower case of the battery 2, and includes a first wall 11 and a plurality of second walls 12, and the first wall 11 and the plurality of second walls 12 enclose a housing chamber 13 for housing the battery cells 7. The first wall 11 may be a bottom wall of the case 10.

The first wall 11 includes a wall body 111, a first convex portion 112, and a reinforcing rib 113. The reinforcing rib 113 protrudes from the surface of the wall body 111 facing away from the accommodating chamber 13, and a plurality of accommodating recesses 114 are formed around the reinforcing rib 113 and the wall body 111, and each accommodating recess 114 is recessed from the surface of the reinforcing rib 113 facing the apron body 21. The first protrusion 112 protrudes from the surface of the wall body 111 facing away from the accommodating chamber 13 and is accommodated in the accommodating recess 114.

The guard 20 is connected to the first wall 11, and the guard 20 comprises a guard body 21 and a second protrusion 22, the guard body 21 being located on the side of the first wall 11 facing away from the receiving chamber 13 and abutting against the stiffener 113. The second convex portion 22 protrudes from the surface of the shield main body 21 facing the first wall 11, the second convex portion 22 abuts against the first convex portion 112 in the thickness direction Z of the first wall 11, the shield 20 forms a concave portion 23 at a position corresponding to the second convex portion 22, and the concave portion 23 is recessed with respect to the surface of the shield main body 21 facing away from the first wall 11.

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 assembly, comprising:

the box body is provided with a containing cavity for containing the battery monomer, the box body comprises a first wall, the first wall comprises a wall main body and a first convex part, and the first convex part protrudes out of the surface of the wall main body, which is away from the containing cavity;

the backplate, connect in first wall, the backplate includes backplate main part and second convex part, the backplate main part is located first wall deviates from one side of holding the chamber, the second convex part protrusion in backplate main part face towards the surface of first wall, the second convex part with first convex part is in the thickness direction of first wall offsets, the backplate is in the position that corresponds with the second convex part forms the concave part, the concave part is relative backplate main part deviates from the surface of first wall is sunken.

2. The tank assembly of claim 1, wherein the second protrusion is annular.

3. The tank assembly of claim 2, wherein the second protrusion is annular.

4. A tank assembly according to claim 2 or 3, wherein the second projection has a loop width of 0.5mm to 10mm.

5. The tank assembly of any one of claims 1-4, wherein an end of the first protrusion facing the second protrusion has a first end face, and an end of the second protrusion facing the first protrusion has a second end face; in the thickness direction, the entirety of the first end face abuts against the second end face.

6. The tank assembly according to any one of claims 1 to 5, wherein in the thickness direction, the first projection projects from the wall main body by a dimension H1, and the second projection projects from the shield main body by a dimension H2, H1 and H2 satisfying:

0.5≤H1/H2≤2。

7. the tank assembly as claimed in any one of claims 1 to 6, wherein the first wall further includes a reinforcing rib protruding from a surface of the wall body facing away from the accommodation chamber, and a dimension of the reinforcing rib protruding from the wall body in the thickness direction is larger than a dimension of the first protrusion protruding from the wall body;

the reinforcing ribs are propped against the guard plate main body.

8. The tank assembly according to claim 7, wherein the reinforcing bead and the wall main body are surrounded to form a plurality of accommodation recesses, each of which is recessed from a surface of the reinforcing bead facing the apron main body;

the first convex portion and the second convex portion are accommodated in at least one of the accommodation concave portions.

9. A tank assembly according to claim 7 or 8, wherein the reinforcing bars are honeycomb-shaped.

10. The tank assembly of any one of claims 1-9, wherein the first protrusion and the second protrusion are each plural, and the first protrusion and the second protrusion are disposed in one-to-one correspondence.

11. The tank assembly of any one of claims 1-10, wherein the first boss is a solid structure.

12. The tank assembly of any one of claims 1 to 11, further comprising a protective layer covering a surface of the apron body facing away from the first wall and a wall surface of the recess.

13. A battery, comprising:

the tank assembly of any one of claims 1-12; and

and the battery unit is accommodated in the accommodating cavity.

14. An electrical device comprising the battery of claim 13 for providing electrical energy.