CN216850204U

CN216850204U - Battery box, battery and power consumption device

Info

Publication number: CN216850204U
Application number: CN202122724274.3U
Authority: CN
Inventors: 姚鹏程; 薛丹月; 陈兴地
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-06-28
Anticipated expiration: 2031-11-08
Also published as: WO2023077743A1

Abstract

The application discloses battery box, battery and power consumption device. The battery box includes box and the case lid that constitutes and hold the chamber, and the box includes: a bottom wall; the side wall is provided with an inner hole, an outer hole and a first cavity, the inner hole is formed in the inner wall of the side wall, the outer hole is formed in the outer wall of the side wall, and the first cavity is communicated with the accommodating cavity through the inner hole and is communicated with the outside of the box body through the outer hole; and the plugging piece is arranged at the inner hole and seals the inner hole, and the plugging piece can be in an open state under the impact of air pressure so as to communicate the accommodating cavity with the first cavity. The technical scheme of the embodiment of the application can improve the safety of the battery.

Description

Battery box, battery and power consumption device

Technical Field

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

Background

In the related art, a rechargeable battery (which refers to a battery that can be continuously used by activating an active material by charging after the battery is discharged, and is also called a secondary battery, and is also referred to as a battery for short herein) includes a battery box and a plurality of battery modules that are combined in series and/or parallel and are located in the battery box, wherein each battery module includes a plurality of battery cells that are combined in series and/or parallel. A battery cell is the smallest unit in a battery that provides a source of energy. The battery cell is, for example, a lithium ion battery cell, and is charged and discharged mainly by movement of lithium ions between a positive electrode and a negative electrode.

How to improve the safety of the battery has been a key issue for those skilled in the art to develop.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a battery box, a battery and an electric device to improve the safety of the battery.

In a first aspect, a battery box is provided, which includes a box body and a box cover forming a containing cavity, the box body includes: a bottom wall; the side wall is provided with an inner hole, an outer hole and a first cavity, the inner hole is formed in the inner wall of the side wall, the outer hole is formed in the outer wall of the side wall, and the first cavity is communicated with the accommodating cavity through the inner hole and is communicated with the outside of the box body through the outer hole; and the plugging piece is arranged at the inner hole and seals the inner hole, and the plugging piece can be in an open state under the impact of air pressure so as to communicate the accommodating cavity with the first cavity.

The battery box of this application embodiment, on the one hand, provides the confession gas from the battery box in to the outer exhaust route of battery box to can release pressure and heat in the battery box when battery takes place thermal runaway fast, prevent effectively that battery box internal gas pressure is too high, improve the security of battery, on the other hand has still restricted the material piece and has entered into from first die cavity and hold the intracavity. Consequently, the battery box of this application embodiment is applied to the battery, can effectively avoid the material piece to enter into at the vibration impact in-process and hold the chamber and to the inside destruction that causes of battery, improves the security of battery.

In some embodiments, the closure is sheet-like and has a score, including a first portion fixedly attached to the inner wall and a second portion capable of being impacted by air pressure to separate after tearing from the first portion along the score.

The blocking piece can close the inner hole under the normal state, so that the material debris is limited from entering the accommodating cavity from the first cavity. When the pressure in the battery box continuously rises and reaches a certain value, the second part of the blocking piece is torn and then separated from the first part along the nick by air pressure impact, so that the blocking piece is in an open state, and the accommodating cavity is communicated with the first cavity. The manufacturing process of the plugging piece is simple, and the manufacturing cost is low.

In some embodiments, the score is in the shape of a closed figure, the first portion being located outside the score and the second portion being located inside the score.

When the pressure in the battery box continuously rises and reaches a certain value, the air pressure impacts the plugging piece, and the first part and the side wall are fixedly connected, so that the second part can be torn along the nick and the first part and then separated to enter the first cavity.

In some embodiments, the score is any one of circular, elliptical, or polygonal.

In some embodiments, the score is in the shape of a non-closed figure, and both ends of the score extend to the edge of the closure.

In some embodiments, the score is any one of linear, curvilinear, dog-leg, or arcuate.

In some embodiments, the closure is in the form of a sheet having a score and comprises a first portion fixedly attached to the inner wall and a second portion capable of being impacted by air pressure and folded after tearing along the score and the first portion.

The nick can be torn under certain atmospheric pressure impact through the weak degree of reasonable design nick to only partly separation between messenger's second portion and the first portion, the second portion is turned up to holding the chamber dorsad, and like this, form an opening between first portion and the second portion, allow the air current to pass through, make the shutoff piece be in the open mode.

In some embodiments, the score is in any one of a semi-closed circle, a semi-closed ellipse, or a semi-closed polygon.

In some embodiments, the closure comprises: the plunger piston can be impacted by air pressure and moves along the through hole to be separated from the through hole.

Under the normal state of the plugging piece, the plunger is positioned in the through hole and is kept in the through hole through the friction force between the plunger and the through hole, and the inner hole is plugged by the plugging piece. When the pressure in the battery box continuously rises and reaches a certain value, the air pressure impacts the plunger, so that the plunger overcomes the friction force to be separated from the through hole and enter the first cavity, and the blocking piece is in an opening state and is communicated with the accommodating cavity and the first cavity.

In some embodiments, the closure comprises a plastic closure or a metal closure.

In some embodiments, the closure is bonded, heat staked or locked to the sidewall by a fastener.

In a second aspect, there is provided a battery comprising: the battery box of any preceding embodiment.

Because the above-mentioned beneficial effect can be brought to the above-mentioned design of battery box, consequently the security of battery obtains showing and promotes.

In a third aspect, an electrical device is provided, comprising: the battery of any of the preceding embodiments.

Because the safety of the battery is obviously improved, the safety of the electric device is correspondingly improved.

In the above embodiment of the application, the inner hole, the first cavity and the outer hole are arranged on the side wall of the battery box body, and the plugging piece is arranged at the inner hole. The hole is sealed with the blocking piece under the normality to restriction material piece enters into from first die cavity and holds the intracavity, and when the battery took place thermal runaway, the blocking piece can be impacted by atmospheric pressure and be in the state of opening, thereby will hold chamber and first die cavity intercommunication, will hold chamber and box external environment intercommunication then, makes pressure and the heat of gathering in the battery box can release fast. Therefore, the battery box in the embodiment of the application can improve the safety of the battery.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

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

fig. 2 is a schematic diagram of a disassembled structure of a battery box according to some embodiments of the present application;

fig. 3 is a schematic diagram of a disassembled structure of a box body of a battery box according to some embodiments of the present application;

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

FIG. 5 is a top view block diagram of a battery case body according to some embodiments of the present application;

FIG. 6 is a schematic cross-sectional view of the case taken along the direction C-C of FIG. 5 in some embodiments of the present disclosure;

FIG. 7 is a schematic cross-sectional view of the case taken along the direction D-D of FIG. 5 in some embodiments of the present disclosure;

FIG. 8 is a schematic illustration of the construction of a closure according to some embodiments of the present application;

FIG. 9 is a schematic illustration of the construction of a closure according to some embodiments of the present application;

FIG. 10 is a schematic illustration of the construction of a closure according to some embodiments of the present application;

fig. 11 is a schematic illustration of a disassembled structure of a battery according to some embodiments of the present application; and

fig. 12 is a schematic structural diagram of an electrical device according to some embodiments of the present disclosure.

The reference numbers in the detailed description are as follows:

1000-a vehicle; 100-a battery; 200-a controller; 300-a motor; 10-a battery box; 11-a box body;

12-a box cover; 20-a battery module; 111-a bottom wall; 112-a side wall; 113-a containment chamber; 114-an inner bore;

115-outer pores; 116-a first cavity; 1160-sub-cavity; 1161-a second cavity; 117-frame body;

118-a closure; 1180-scoring; 1181-a first portion; 1182-a second portion; 83-a fixation section; 830-through holes; 84-a plunger; 2000-electric devices.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

The main structure of the battery includes a battery box and a plurality of battery modules combined in series and/or parallel within the battery box. The battery box comprises a box body and a box cover, and the box cover covers the box body and then forms an accommodating cavity together with the box body. The battery module mainly includes a plurality of battery cells combined in series and/or parallel. The battery cell is the smallest unit of the battery that provides a source of energy, and is, for example, a lithium ion battery cell.

In order to improve the mechanical strength of the battery box and lighten the battery box, in the related art, the side wall of the box body of the battery box adopts a cavity structure, namely, the side wall of the box body is not of a solid plate structure but is designed into a hollow structure, and the cavity of the hollow structure is the cavity, so that the mechanical strength of the box body is enhanced, and compared with the solid plate structure with the same strength, the battery box can obtain lighter weight.

Thermal runaway of a battery is caused by the fact that the heat generation rate of the battery is much higher than the heat dissipation rate, and heat is accumulated in a large amount and is not dissipated out of the battery in time. Taking a battery as an example of a lithium ion battery, during thermal runaway of the lithium ion battery, due to high temperature, Solid Electrolyte Interface (SEI) decomposition of a negative electrode, active material decomposition of a positive electrode, and oxidative decomposition of an Electrolyte may be caused, so that a large amount of gas is generated, gas pressure inside the battery is rapidly increased, and if the gas cannot be discharged in time and the pressure inside the battery is released, explosion of the battery may be caused, and further, safety of people and property may be seriously threatened. Nowadays, with the increasing size and capacity of power batteries, the gas released by thermal runaway is also increased by times. Therefore, the safety of battery use has been a research focus of those skilled in the art.

In some related arts, in order to solve the above problem of thermal runaway, a pressure relief structure is designed on a case body of a battery case, for example, a related structure that enables gas to be discharged from a housing chamber to the outside of the battery case through a cavity.

The inventors of the present application have noted that during the manufacturing of the battery box, operations such as cutting or machining the raw material (for example, drilling holes in the inner or outer walls of the profiles) generate a large amount of material scraps that are easily trapped in the cavities. In the related art battery including such a battery case, when the battery is subjected to vibration impact during testing, transportation, or use, it is highly likely that material debris (e.g., aluminum debris when the case is an aluminum case) in the cavity of the case enters the inside of the case of the battery case through the opening. Once these material fragments enter the interior of the case, even the interior of the battery module, they cause serious damage to the battery and also cause great safety hazards.

Therefore, how to prevent the material debris from entering the box body under the premise of considering the thermal runaway exhaust pressure release is also the key point considered by the inventor of the application.

Based on the above consideration, the inventors have conducted intensive studies to provide a battery case, a battery, and a power utilization device in order to improve the safety of the battery.

In the embodiment that this application provided, the lateral wall of the box of battery box adopts the die cavity structure, set up the hole that the intercommunication held chamber and first die cavity at the inner wall of lateral wall, set up the outer hole of the first die cavity of intercommunication and box external environment at the outer wall of lateral wall, and, set up the shutoff piece in hole, this shutoff piece is closed the hole under the normality (hold intracavity pressure not higher than pressure threshold value promptly), and can receive the atmospheric pressure impact (hold intracavity pressure and be higher than pressure threshold value) and be in the state of opening, thereby will hold chamber and first die cavity intercommunication, then will hold chamber and box external environment intercommunication.

For the sake of distinction, the cavity communicating with both the inner hole and the outer hole is referred to as a first cavity, and the cavity not communicating with the inner hole is referred to as a second cavity. The second cavity is not of particular concern to the inventors since it is not necessarily structural and does not communicate with the bore, and thus material debris, if any, does not enter the receiving cavity.

The inner hole, the outer hole, the first cavity and the blocking piece in the opening state provide a path for gas to be discharged from the inside of the battery box to the outside of the battery box, so that pressure and heat accumulated in the battery box when thermal runaway occurs can be quickly released. The blocking piece normally closes the inner hole, and can limit the material fragments from entering the accommodating cavity from the first cavity. Therefore, the design of this application embodiment can effectively avoid the destruction that the material piece caused to battery inside to improve the security of battery, in addition, still be favorable to prolonging the life of battery.

Based on the technical effects of the battery box, the battery comprising the battery box and the electric device comprising the battery can also obtain corresponding technical effects.

The battery disclosed in the embodiment of the application can be a power battery or an energy storage battery. The application scenarios of the power battery include, but are not limited to, vehicles, ships, aircrafts, spacecraft, electric tools, electric toys, various mobile terminals, and the like. The application scenarios of the energy storage battery include, but are not limited to, a solar power generation system, a hydraulic power generation system, a wind power generation system, and the like.

As shown in fig. 1, a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application is provided. The specific type of the vehicle 1000 is not limited, and is, for example, a new energy electric vehicle, which includes a battery 100, a controller 200, and a motor 300. The battery 100 may supply power to various power consuming modules of the entire vehicle, for example, the controller 200, the motor 300, and a control system and an air conditioner (not shown).

As shown in fig. 2, some embodiments of the present application provide a battery box 10 including a box body 11 and a box cover 12 forming a receiving cavity 113. The box 11 includes a bottom wall 111, a side wall 112, and a stopper 118. As shown in fig. 2 to 7, the side wall 112 has an inner hole 114, an outer hole 115 and a first cavity 116, the inner hole 114 is provided on the inner wall of the side wall 112, the outer hole 115 is provided on the outer wall of the side wall 112, and the first cavity 116 is communicated with the accommodating chamber 113 through the inner hole 114 and with the external environment of the box body 11 through the outer hole 115. The plugging piece 118 is arranged at the inner hole 114 and seals the inner hole 114, and the plugging piece 118 can be impacted by air pressure to be in an opening state so as to communicate the accommodating cavity 113 with the first cavity 116, and then communicate the accommodating cavity 113 with the external environment of the box body 11.

The main functions of the case 11 include: the battery module is carried and installed, and is connected with other structures of the electric device, so that the mechanical protection of the contents is realized, and the like. The box 11 may be a die-cast aluminum box or a sheet metal box. The main functions of the cover 12 include: to achieve dust prevention and sealing of the battery case 10, to mechanically protect the contents of the battery case 10, and the like. The cover 12 may be a sheet metal cover or a composite cover.

Referring to the normal use state of the battery as an orientation reference, as shown in fig. 2, the bottom wall 111 of the box 11 is located at the bottom of the box 11, the side wall 112 of the box 11 forms an angle of approximately 90 degrees with the bottom wall 111 and surrounds the bottom wall 111 for a circle, so as to form an open accommodating space together with the bottom wall 111, and after the box cover 12 is covered on the box 11, the box cover 12 and the box 11 form a closed accommodating cavity 113 together. The receiving cavity 113 is mainly used for receiving a plurality of battery modules combined in any one of series connection, parallel connection, or series-parallel connection (i.e., both series connection and parallel connection).

As shown in fig. 5, 6 and 7, the side wall 112 of the box body 11 adopts a cavity structure, and the side wall 112 has a hollow cavity structure. Thus, not only is the mechanical strength of the case 11 enhanced, but also a lighter weight can be obtained compared to a solid plate structure with the same strength.

In the embodiment of the present application, the specific configuration and the forming manner of the cavity configuration of the sidewall 112 are not limited. For example, as shown in fig. 6 and 7, in some embodiments, the side wall 112 may be formed by welding a plurality of frame bodies 117 each having a cavity, for example, a plurality of frame bodies 117 having a cavity are welded in sequence in the height direction. Each frame body 117 may be formed with its cavity by an extrusion process. The cavities of some of the frame bodies 117, as shown in the drawing, two sub-type cavities 1160, may communicate with each other after welding, thereby forming a larger hollow space, for example, the first cavity 116.

In the present embodiment, the first cavity 116 is a cavity that contributes to the release of gas pressure within the battery case 10. The sub-type cavity 1160 is a smallest division unit of the first cavity 116, and the first cavity 116 may include one sub-type cavity 1160 or include a plurality of interconnected sub-type cavities 1160.

Of course, as shown in fig. 6 and 7 for example, the side wall may also include second cavities 1161, since the inner hole 114 is not opened on the frame body 117 where the second cavities 1161 are located, even the dropped material chips in the second cavities 1161 do not enter into the accommodating cavity 113.

The frame 117 is, for example, a substantially rectangular frame, the inner hole 114 is opened in the frame 117 and communicates with the first cavity 116, and the outer hole 115 may be opened on any side of the rectangle, and is not limited to the position shown in the drawing.

Since the sidewall 112 adopts a cavity structure, the sidewall 112 is not a single-layer plate, but includes an inner wall and an outer wall separated by some hollow cavities, wherein the inner wall may be understood as a wall surface of the sidewall 112 close to a side of the accommodating cavity 113, the inner wall is directly exposed in the accommodating cavity 113, and the outer wall may be understood as a wall surface of the sidewall 112 far from a side of the accommodating cavity 113, and the outer wall serves as a part of an external surface of the box body 11.

The battery box 10 provided by the embodiment of the application is used as a part of the main structure of the battery, and an exhaust structure capable of exhausting gas out of the battery box 10 is designed aiming at thermal runaway.

The inner hole 114 is a hole formed in the inner wall of the side wall 112, the outer hole 115 is a hole formed in the outer wall of the side wall 112, and the first cavity 116 is communicated with the accommodating chamber 113 through the inner hole 114 and with the outside of the box body 11 through the outer hole 115. The blocking member 118 normally closes the inner hole 114 to limit the entry of material debris from the first cavity 116 into the receiving cavity 113. When the pressure in the battery case 10 continues to rise and reaches a certain value, the air pressure strikes the blocking piece 118 to open it, thereby communicating the accommodation chamber 113 with the first cavity 116.

The inner hole 114, the blocking member 118, the first cavity 116 and the outer hole 115 serve as a gas exhaust structure, which provides a path for gas to be exhausted from the inside of the battery case 10 to the outside of the battery case 10, so that pressure and heat accumulated in the battery case 10 when thermal runaway occurs can be rapidly released.

The battery box 10 of the embodiment of the application provides a path for gas to be exhausted from the inside of the battery box to the outside of the battery box, so that pressure and heat accumulated in the battery box when thermal runaway occurs can be quickly released, the safety of a battery is improved, and on the other hand, material scraps are limited from entering the accommodating cavity from the first cavity. Therefore, the battery box of this application embodiment is applied to the battery, can effectively avoid the material piece to the inside destruction that causes of battery, improves the security of battery.

As shown in fig. 2, 3 and 4, according to some embodiments of the present disclosure, the blocking member 118 is a sheet and has a score 1180, and includes a first portion 1181 and a second portion 1182, the first portion 1181 is fixedly connected to the inner wall of the sidewall 112, and the second portion 1182 can be separated from the first portion 1181 after being torn along the score 1180 by air pressure impact.

The blocking element 118 is in the form of a sheet, i.e. a sheet or a lamella. The score is a line mark formed on the sheet material with a thinner thickness than other regions using a tool such as a knife. As shown in fig. 4, since the thickness of the score 1180 is relatively thin, the structure is relatively weak, and when the second portion 1182 is impacted by a certain external force, it will be torn and disconnected from the first portion 1181 at the score 1180.

The first portion 1181 is fixedly attached to the inner wall of the sidewall 112, for example, but not limited to, by adhesive bonding, by heat pressing, or by locking with a fastener such as a screw.

In this embodiment, by properly designing the weakness of the nick 1180, the nick 1180 can be torn to break under the impact of a certain air pressure, so that the second portion 1182 is completely separated from the first portion 1181. It will be appreciated that since the closure 118 is subjected to gas pressure directed away from the receiving cavity 113, the second portion 1182 will fall into the first cavity 116 after separation from the first portion 1181. The closure 118 is structurally destroyed after opening.

The closure 118 normally closes the inner bore 114 to restrict the passage of material debris from the first cavity 116 into the receiving cavity 113. When the pressure in the battery box 10 continuously rises and reaches a certain value, the second portion 1182 of the blocking piece 118 is torn and then separated from the first portion 1181 along the score 1180, so that the blocking piece 118 is in an open state, and the accommodating cavity 113 is communicated with the first cavity 116. Therefore, the design of this application embodiment battery box can effectively solve the technical problem among the correlation technique, improves the security of battery. The manufacturing process of the plugging piece is simple, and the manufacturing cost is low.

It will be appreciated that in order for the closure 118 to be able to be opened accurately, the area of the score 1180 should be directly opposite the open area of the bore 114.

In the embodiment of the present application, the overall shape of the blocking member 118 and the shape of the score 1180 are not particularly limited. The overall shape of the closure 118 can be designed, for example, as a circle or a polygon (e.g., square), etc.

As shown in fig. 3 and 4, according to some embodiments of the present application, the score 1180 has a closed figure shape, and the first portion 1181 is located outside the score 1180 and the second portion 1182 is located inside the score 1180.

The closed figure shape is, for example, a figure shape without end points, such as a circle, a polygon (e.g., a square), or an ellipse. The inner side of the score 1180 is an inner region defined by the closed figure shape, and the outer side of the score 1180 is an outer region defined by the closed figure shape.

As shown in fig. 8, the score 1180 may also be in the shape of a non-closed figure, and both ends of the score 1180 extend to the edge of the closure 118 according to some embodiments of the present disclosure.

The shape of the score 1180 may be any of a straight line, a curved line, a broken line, or an arc, for example, and the non-closed figure shape is the same as the closed figure shape described above. As can be seen, the closure 118 may still be divided into a first portion 1181 and a second portion 1182 by the score 1180.

When the pressure in the battery box 10 continuously rises and reaches a certain value, the air pressure impacts the blocking piece 118, and since the first portion 1181 is fixedly connected with the side wall 112, the second portion 1182 is torn along the nick 1180 and the first portion 1181, and then is separated to enter the first cavity 116.

As shown in fig. 9, according to some embodiments of the present disclosure, the blocking member 118 is a sheet and has a score 1180, and includes a first portion 1181 and a second portion 1182, the first portion 1181 is configured to be fixedly connected to an inner wall of the sidewall 112, and the second portion 1182 can be torn along the score 1180 and the first portion 1181 by air pressure impact and then folded.

In contrast to the structure of the blocking member 118 shown in fig. 3 and 8, in this embodiment, by properly designing the weakness of the score 1180, the score 1180 can be torn under the impact of a certain air pressure, so that only a part of the second portion 1182 is separated from the first portion 1181, and the second portion 1182 is folded back from the receiving cavity 113 (the score is not provided at the fold line), so that an opening is formed between the first portion 1181 and the second portion 1182 to allow the air flow to pass through, and thus, the blocking member 118 is in an open state.

It will be appreciated that, since the closure 118 is subjected to gas pressure directed away from the receiving cavity 113, the second portion 1182 is folded away from the receiving cavity 113 after tearing away from the first portion 1181. The closure 118 is structurally destroyed after opening.

In these embodiments, the shape of the score 1180 is not limited, and may be, for example, any one of a semi-closed circle, a semi-closed ellipse, or a semi-closed polygon (e.g., a semi-closed square). Wherein the semi-closed shape is relative to the closed figure shape.

As shown in fig. 10, according to some embodiments of the present application, the closure 118 may also be designed to include: the fixing part 83 is provided with a through hole 830, the plunger 84 is positioned in the through hole 830, the fixing part 83 is used for being fixedly connected with the side wall 112, and the plunger 84 can move along the through hole 830 to be separated from the through hole 830 under the impact of air pressure.

The fixing portion 83 may be fixedly connected to an inner wall of the sidewall 112, for example, so as to fix the plugging member 118 to the sidewall 112, thereby realizing the installation of the plugging member 118.

The shape of the plunger 84 is adapted to the shape of the through hole 830, but the specific shape is not limited, for example, the plunger 84 is a cylindrical plunger. The closure 118 is normally positioned with the plunger 84 in the through bore 830 and held in the through bore 830 by friction therebetween, the closure 118 closing off the internal bore 114. When the pressure in the battery box 10 continuously rises and reaches a certain value, the air pressure impacts the plunger 84, so that the plunger 84 overcomes the friction force to be separated from the through hole 830 and enter the first cavity 116, and the blocking piece 118 is in an open state to communicate the accommodating cavity 113 with the first cavity 116. Therefore, the technical problems in the related art can be effectively solved, and the safety of the battery is improved.

It will be appreciated that in order for the closure 118 to be opened properly, the through-bore 830 should be located in an area opposite the opening of the bore 114 in the side wall 112.

In the embodiment, the first cavity 116 of the sidewall 112 of the box 11 may include one sub-cavity 1160, or may include a plurality of sub-cavities 1160 connected to each other. Wherein each sub-type cavity 1160 is formed corresponding to one of the aforementioned frame bodies 117, for example. When the first cavity 116 includes a plurality of sub-cavities 1160, the sub-cavities 1160 may be in communication, such as in series, by structural design, such that the airflow may be rapidly dispersed through the closure 118 into the sub-cavities 1160 and then out through the outer apertures 115 of the sidewall 112 to the external environment.

Referring to fig. 5, 6 and 7, according to some embodiments of the present disclosure, the first cavity 116 includes a plurality of sub-cavities 1160 (e.g., 2 sub-cavities 1160 shown in the drawings) that are connected to each other, the sub-cavities 1160 are sequentially arranged in a direction away from the bottom wall 111, and each sub-cavity 1160 surrounds the receiving cavity 113 for a circle. The inner hole 114 may be opened on the adjacent two frame bodies 117 of the side wall 112 (as shown in fig. 6 and 7) so as to directly communicate with the two sub-type cavities 1160. Further, the inner hole 114 may be opened on one of the frame bodies 117 of the side wall 112 to directly communicate with one of the sub-type cavities 1160.

In the embodiment of the present application, the type of material of the block-off piece 118 is not limited, and may be, for example, a plastic block-off piece or a metal block-off piece, as long as it can satisfy the structural strength required and is durable.

The material of the plastic closure mainly comprises plastic, such as Polycarbonate (PC) or Polystyrene (PS), among others. The material of the metal closure mainly comprises a metal, such as aluminum, copper, or an aluminum alloy, etc.

In the embodiment of the present application, the specific connection manner of the blocking member 118 and the sidewall 112 is not limited, for example, the blocking member 118 and the sidewall 112 may be bonded, heat-pressed, or locked by a fastener.

The adhesive bonding is performed by providing a glue on the contact surface between the plug 118 and the sidewall 112, and bonding the two through the glue. Hot pressing is a process of applying a certain pressure to a material heated to a molten state to bond the material with another object. The fastener locking is locking the closure 118 to the sidewall 112 using a screw or bolt assembly or the like, such as by locking the closure 118 to the sidewall 112 via a bolt assembly extending through the first portion 1181 of the closure 118 and the sidewall 112.

As shown in fig. 11, according to some embodiments of the present application, there is also provided a battery 100 including the battery box 10 of any of the above embodiments, and a plurality of battery modules 20 combined in series and/or parallel within the battery box 10.

The battery 100 may be a power battery or an energy storage battery applied to various electric devices. Since the above-described design of the battery case 10 can bring about the above-described advantageous effects, the safety of the battery 100 is significantly improved.

As shown in fig. 12, according to some embodiments of the present application, there is also provided an electric device 2000 including the battery of any of the foregoing embodiments.

The power consuming device 2000 may be any one of the aforementioned power consuming devices requiring access to a battery, such as a power consumer or an energy storage device. Since the safety of the battery 100 is significantly improved, the safety of the electric device 2000 is correspondingly improved.

Referring to fig. 2, the battery box 10 according to some embodiments of the present disclosure includes a box body 11 and a box cover 12 forming a receiving cavity 113. The box 11 includes a bottom wall 111, a side wall 112 and a blocking member 118. The side wall 112 has an inner hole 114, an outer hole 115, and a first cavity 116, the inner hole 114 is provided on an inner wall of the side wall 112, the outer hole 115 is provided on an outer wall of the side wall 112, and the first cavity 116 is communicated with the receiving chamber 113 through the inner hole 114, and is communicated with the outside of the case 10 through the outer hole 115. The blocking piece 118 is arranged at the inner hole 114 and closes the inner hole 114, and the blocking piece 118 can be in an open state under the impact of air pressure so as to communicate the accommodating cavity 113 with the first cavity 116. The blocking member 118 is a sheet and has a notch 1180 in a shape of a closed figure, and includes a first portion 1181 located outside the notch 1180 and a second portion 1182 located inside the notch 1180, the first portion 1181 is fixedly connected to the inner wall of the sidewall 112, and the second portion 1182 can be separated from the first portion 1181 after being torn along the notch 1180 by air pressure impact. The blocking member 118 normally closes the inner hole 114 to limit the entry of material debris from the first cavity 116 into the receiving cavity 113. When the pressure in the battery case 10 continues to rise and reaches a certain value, the air pressure impacts the blocking piece 118 to open it, thereby communicating the accommodation chamber 113 with the first cavity 116. Therefore, the battery box of this application embodiment is applied to the battery, can effectively avoid the material piece to the inside destruction that causes of battery, improves the security of battery.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit of the embodiments of the present application, and they should be construed as being included in the scope of the claims and description of the present application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. The utility model provides a battery box which characterized in that, including constituting box and the case lid that holds the chamber, the box includes:

a bottom wall;

the side wall is provided with an inner hole, an outer hole and a first cavity, the inner hole is formed in the inner wall of the side wall, the outer hole is formed in the outer wall of the side wall, and the first cavity is communicated with the accommodating cavity through the inner hole and is communicated with the outside of the box body through the outer hole; and

The blocking piece is arranged at the inner hole and used for closing the inner hole, and the blocking piece can be in an open state under the impact of air pressure so as to communicate the accommodating cavity with the first cavity.

2. The battery box of claim 1,

the blocking piece is in a sheet shape and provided with a notch, and comprises a first part and a second part, wherein the first part is fixedly connected with the inner wall, and the second part can be separated from the first part after being torn along the notch under the impact of air pressure.

3. The battery box of claim 2,

the score is in a closed figure shape, the first part is positioned on the outer side of the score, and the second part is positioned on the inner side of the score.

4. The battery box according to claim 3,

the nicks are in any one of a circle, an ellipse or a polygon.

5. The battery box according to claim 2,

the score is in the shape of a non-closed figure, and both ends of the score extend to the edge of the closure.

6. The battery box according to claim 5,

the nicks are in any one of a straight line shape, a curve shape, a broken line shape or an arc shape.

7. The battery box of claim 1,

the blocking piece is sheet-shaped and provided with a nick, and comprises a first part and a second part, wherein the first part is fixedly connected with the inner wall, and the second part can be impacted by air pressure to be torn along the nick and the first part and then folded.

8. The battery box according to claim 7,

the nicks are in any one of a semi-closed circle, a semi-closed ellipse or a semi-closed polygon.

9. The battery box according to claim 1,

the blocking piece comprises: the plunger piston can be impacted by air pressure and moves along the through hole to be separated from the through hole.

10. The battery box according to any one of claims 1 to 9,

the closure comprises a plastic closure or a metal closure.

11. The battery box according to any one of claims 1 to 9,

the blocking piece is bonded with the side wall, connected in a hot pressing mode or locked through a fastening piece.

12. A battery, comprising: the battery case according to any one of claims 1 to 11.

13. An electric device comprising the battery of claim 12.