CN216120530U

CN216120530U - Battery and electric device

Info

Publication number: CN216120530U
Application number: CN202122529526.7U
Authority: CN
Inventors: 周仓; 陈悦飞; 薛龙飞; 张小细; 曹俊琪
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2022-03-22
Anticipated expiration: 2031-10-20

Abstract

The application discloses a battery and a power consumption device. The battery includes: the battery pack comprises a plurality of battery cells and a heat insulation piece, wherein the battery cells are arranged side by side along a first direction, each battery cell in the battery cells comprises a first surface oppositely arranged along the first direction and two second surfaces oppositely arranged along a second direction, and the second direction is intersected with the first direction; the thermal insulation piece is used for isolating two adjacent battery cells and comprises a main body part and a first extension part which are connected with each other, the main body part is attached to the first surface, and the first extension part at least covers the connection part of the first surface and the second surface of the part. The first surface in the battery provided by the application can be covered by the thermal insulation piece, and the safety and the electrochemical performance of the battery cell are improved.

Description

Battery and electric device

Technical Field

The application relates to the technical field of energy storage devices, in particular to a battery and an electric device.

Background

The battery cell is widely used in electronic devices such as a mobile phone, a notebook computer, a battery car, an electric airplane, an electric ship, an electric toy car, an electric toy ship, an electric toy airplane, an electric tool, and the like. The battery monomer can comprise a cadmium-nickel battery monomer, a hydrogen-nickel battery monomer, a lithium ion battery monomer, a secondary alkaline zinc-manganese battery monomer and the like.

To accommodate voltage and current requirements of electronic devices, a plurality of battery cells are typically assembled in groups to form a battery. In addition to improving the performance of batteries, safety issues are also a considerable problem in the development of battery technology. If the safety problem of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the safety of the battery is a technical problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a battery and an electric device, which can improve the safety of the battery.

In a first aspect, the present application provides a battery, including a plurality of battery cells and a heat insulating member, the plurality of battery cells being arranged side by side along a first direction, each of the plurality of battery cells including a first surface arranged oppositely along the first direction and two second surfaces arranged oppositely along a second direction, the second direction intersecting the first direction; the thermal insulation piece is used for isolating two adjacent battery cells and comprises a main body portion and a first extension portion which are connected with each other, the main body portion is attached to the first surface, and the first extension portion at least covers the connection position of the first surface and the second surface of the portion.

In some embodiments, heat insulation members are arranged between the battery cells, so that heat conduction between the battery cells can be effectively reduced; on one hand, the main body part is attached to the first surface, and the first extension part connected with the main body part is attached to the connection position of the first surface and the second surface, so that in the assembled battery, the first surface can be covered by the heat insulation part, and when the battery monomer is out of control due to heat, the heat transfer to the adjacent battery monomer can be reduced, the heat spreading can be reduced, and the safety performance of the battery can be improved; on the other hand, the first extending part at least covers the joint of the first surface and the second surface of the part, so that even if assembly tolerance exists, the first surface can be completely covered by the heat insulation piece, the first surface is prevented from being deformed when the battery cell is extruded due to the fact that the heat insulation piece only covers the first surface of the part, and the electrochemical performance of the battery cell is improved.

In some embodiments, at least a portion of the first extension is bent and attached to the second surface. The first extending part is bent, so that the first extending part and the second surface can be attached, and the first extending part and the second surface are attached, so that the heat insulation piece can insulate the first surface and the second surface, and the heat spreading is reduced.

In some embodiments, the thickness of the first extension is less than or equal to the thickness of the main body portion. The thickness of the first extension part is made thinner, so that the overall size of the battery can be reduced.

In some embodiments, the battery cell further comprises a transition surface, the transition surface connects the first surface and the second surface, and the transition surface is at least partially an arc surface; the first extension includes a first portion attached to the second surface and a second portion attached to the transition surface. The first extension part is matched with the shape of the battery cell, and the first extension part can insulate the second surface, so that heat spreading is reduced; first extension all attaches with second surface, transition face, improves the area that battery monomer and first extension contacted for heat insulating part and battery monomer fixed are more firm, have avoided the problem that heat insulating part drops from the battery monomer, have improved this battery monomer stability in use and security.

In some embodiments, the thickness of the first portion is less than the thickness of the second portion. In order to reduce the overall size of the battery, the thickness of the first part is set to be smaller than the thickness of the second part and the thickness of the main body part; because the transition surfaces are cambered surfaces, certain space is formed between the transition surfaces of the adjacent single batteries, and the second part with thicker thickness can be accommodated; in fact, the thermal insulating member may be an integrally formed structure during manufacture, providing the second portion with a thickness intermediate between the main body portion and the first portion, facilitating manufacture.

In some embodiments, the first extension includes two first portions attached to the second surfaces of the two battery cells, respectively, and two second portions attached to the transition surfaces of the two battery cells, respectively. A thermal shield has two first portions and a second portion, such that thermal isolation of the transition surface and the second surface of the two cells is achieved by the thermal shield.

In some embodiments, the battery further includes two side plates respectively located at both sides of the plurality of battery cells in the second direction, and the first portion is located between the side plates and the second surface. The first portion is positioned between the side plate and the second surface such that the first portion is sandwiched between the side plate and the second surface, improving the mounting stability of the thermal shield.

In some embodiments, the first portion includes an outer surface distal from the battery cell and the second portion includes a chamfered surface distal from the battery cell, the chamfered surface being flush with the outer surface and abutting the side plate. Through setting up chamfer face and curb plate butt to increase the area of contact of first extension and curb plate, make better and the curb plate laminating of first extension.

In some embodiments, the number of the first extending portions is two, and the two first extending portions are respectively connected with two opposite ends of the main body portion. The two first extension parts may insulate the second surfaces of the same battery cell or two battery cells, respectively.

In some embodiments, the battery cell includes two third surfaces oppositely disposed along a third direction, the third direction intersecting both the first direction and the second direction;

the thermal insulation member further includes a second extension extending from an end of the main body in the third direction, the second extension covering at least a junction of the first surface and the third surface of the portion. Through the second extension part, the edge of the first surface close to the second extension part can be covered by the heat insulation part.

In some embodiments, the battery cell further includes: the electrode assembly comprises an end cover, a shell, an electrode assembly and a patch, wherein the end cover and the shell form a containing cavity; the electrode assembly is arranged in the accommodating cavity; the patch is attached to a side of the end cap remote from the housing, the surface of the patch facing away from the housing being a third surface, the second extension being attached to the patch. The second extension part is attached to the patch and can insulate the top end of the battery cell.

In some embodiments, an adhesive layer is disposed on the heat insulating member, and the heat insulating member is adhered to the battery cell through the adhesive layer, so that the battery cell and the heat insulating member are conveniently assembled.

In a second aspect, the present application provides an electric device, which includes the battery as described above, and the battery is used for providing electric energy.

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

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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

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

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

FIG. 4 is an exploded view of a battery according to other embodiments of the present application;

fig. 5 is a schematic top view of a battery according to some embodiments of the present application;

FIG. 6 is an enlarged schematic view of portion A of FIG. 5;

FIG. 7 is a schematic perspective view of an insulation barrier of some embodiments of the present application in a flat state;

FIG. 8 is an enlarged view of the portion B shown in FIG. 7;

FIG. 9 is a schematic cross-sectional view of an insulation element according to some embodiments of the present application in a flattened state;

FIG. 10 is a schematic diagram of a partial cross-sectional structure of a battery according to some embodiments of the present application

FIG. 11 is a cross-sectional view of an insulation barrier of other embodiments of the present application in a flattened configuration;

FIG. 12 is a schematic view of a cross-sectional view of a portion of a battery according to yet another embodiment of the present application;

fig. 13 is a schematic top view of a battery according to some other embodiments of the present application;

fig. 14 is a schematic top view of a battery according to further embodiments of the present application;

FIG. 15 is an exploded view of a battery according to yet other embodiments of the present application;

FIG. 16 is a schematic cross-sectional view of a battery according to some embodiments of the present application;

fig. 17 is an enlarged schematic view of a portion C shown in fig. 16;

FIG. 18 is a cross-sectional view of an insulation element according to yet other embodiments of the present application in a flattened condition.

The reference numbers are as follows:

a vehicle 1000;

battery 100, controller 200, motor 300;

an upper cover 10; a battery cell 20; an end cap 21; the electrode terminals 21a; a housing 22; an electrode assembly 23; a patch 24; a first surface 25; a second surface 26; a transition surface 27; a third surface 28; a lower cover 30;

a heat insulating member 40; a main body portion 41; the first extension 42; a first portion 421; a second portion 422; the inner surface 42a; the partition surface 421b; an outer surface 422b; the chamfered surface 423b; the second extension 43; a third portion 43a; an adhesive layer 44;

a side plate 50; an end plate 60.

Detailed Description

Embodiments of the present application will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

Reference in the specification 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 specification. 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.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the single battery of cylindricality battery, square battery monomer and laminate polymer battery monomer, this application embodiment is also not limited to this.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charge or discharge of battery cells.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is laminated to be used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the mass flow body protrusion in the mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer is as negative pole utmost point ear after the mass flow body of not scribbling the negative pole active substance layer is range upon range of. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The inventor notices that, in the current battery, a box body is required to be arranged to place one or more battery cells, and a heat insulation piece is required to be arranged between the adjacent battery cells so as to reduce the heat influence among the battery cells. The first surface of the battery cell in contact with the thermal insulation member is consistent with the size of the thermal insulation member, so that the first surface can be completely covered by the thermal insulation member theoretically, but due to manufacturing tolerance or assembly tolerance, each edge of the first surface cannot be completely coincided with the edge of the thermal insulation member in the assembled product, and a vacant gap is formed between the edges of the adjacent battery cells which cannot be attached to the thermal insulation member. After further research, it is found that when an external force presses a single battery, a part of the single battery corresponding to a gap cannot transfer the force to another single battery through a heat insulation member, so that the part of the single battery corresponding to the heat insulation member is easily deformed, and the electrochemical performance of the single battery is affected.

In order to solve the problem that the battery monomers are easy to deform under the action of external force due to the fact that the heat insulation piece cannot be completely overlapped with the first surface, and the electrochemistry of the battery monomers is influenced, through intensive research, the inventor designs a battery, and arranges a plurality of battery monomers side by side along a first direction, and arranges the heat insulation piece to isolate two adjacent battery monomers, so that the heat conduction between the battery monomers can be effectively reduced; each battery cell comprises a first surface and two second surfaces, the first surfaces are oppositely arranged along a first direction, the two second surfaces are oppositely arranged along a second direction, the heat insulation piece comprises a main body part and a first extension part which are mutually connected, the main body part is attached to the first surface, and the first extension part at least covers the joint of the first surface and the second surface of the part, so that in the assembled battery, the first surface can be covered by the heat insulation piece, when the battery cell is subjected to thermal runaway, the heat transfer to the adjacent battery cell can be reduced, and the heat spread is reduced; on the other hand, the first extending part at least covers the joint of the first surface and the second surface of the part, so that even if assembly tolerance exists, the first surface can be completely covered by the heat insulation piece, the first surface is prevented from being deformed when the battery cell is extruded due to the fact that the heat insulation piece only covers the first surface of the part, and the electrochemical performance of the battery cell is improved.

The battery cell disclosed in the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. The power supply system with the electric device formed by the battery monomer, the battery and the like disclosed by the application can be used, so that the stability of the performance of the battery is favorably improved, and the service life of the battery is prolonged.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or an extended range automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case and a battery cell 20. In some embodiments, the case may include an upper cover 10 and a lower cover 30, the upper cover 10 and the lower cover 30 cover each other, and the upper cover 10 and the lower cover 30 together define a receiving space for receiving the battery cell 20. The lower cover 30 may be a hollow structure with an open end, the upper cover 10 may be a plate-shaped structure, and the upper cover 10 covers the open side of the lower cover 30, so that the upper cover 10 and the lower cover 30 together define an accommodating space; the upper cover 10 and the lower cover 30 may be both hollow structures with one side opened, and the opening side of the upper cover 10 may cover the opening side of the lower cover 30. Of course, the case formed by the upper cover 10 and the lower cover 30 may have various shapes, for example, a cylinder, a rectangular parallelepiped, etc.

In the battery 100, the number of the battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells 20. The plurality of battery monomers 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers 20 is accommodated in the box body; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel, and a plurality of battery modules are connected in series, in parallel, or in series-parallel to form a whole and accommodated in the case. The battery 100 may also include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is an exploded schematic view of a battery cell 20 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes an end cap 21, a case 22, an electrode assembly 23, a patch 24, and other functional components.

The end cap 21 refers to a member that covers an opening of the case 22 to insulate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of end cap 21 may be adapted to the shape of housing 22 to fit housing 22. Alternatively, the end cap 21 may be made of a material (e.g., an aluminum alloy) having certain hardness and strength, so that the end cap 21 is not easily deformed when being extruded and collided, and the single battery 20 may have higher structural strength and improved safety performance. The end cap 21 may be provided with functional components such as the electrode terminals 21 a. The electrode terminals 21a may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric energy of the battery cells 20. In some embodiments, the end cap 21 may further include a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 22 is an assembly for mating with the end cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 may be separate components, and an opening may be provided in the housing 22, and the opening may be covered by the end cap 21 to form the internal environment of the battery cell 20. The end cap 21 and the housing 22 may be integrated, and specifically, the end cap 21 and the housing 22 may form a common connecting surface before other components are inserted into the housing, and when it is required to seal the inside of the housing 22, the end cap 21 covers the housing 22. The housing 22 may be a variety of shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention is not limited thereto.

The electrode assembly 23 is a part in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the housing 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the main body of the electrode assembly 23, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. The positive electrode tab and the negative electrode tab can be positioned at one end of the main body together or at two ends of the main body respectively. During the charge and discharge of the battery, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminals 21a to form a current loop.

The patch 24 prevents foreign sharp objects from piercing the end cap 21 or foreign fluids from entering the housing 22. The patch 24 may be made of one or more of PE (Polyethylene), PVC (polyvinyl chloride), PPS (polyphenylene sulfide), PET (Polyethylene terephthalate), PP (Polypropylene), nylon, and ABS (acrylonitrile butadiene styrene) materials, so as to insulate the end cap 21 of the battery cell 20, thereby improving the safety of the battery cell 20.

According to some embodiments of the present application, please refer to fig. 4 to 6 together, wherein fig. 4 is an exploded structural diagram of a battery according to some embodiments of the present application; fig. 5 is a schematic top view of a battery according to some embodiments of the present application; fig. 6 is an enlarged schematic view of a portion a shown in fig. 5. The application provides a battery 100, which comprises a plurality of battery cells 20 and a heat insulation piece 40, wherein the plurality of battery cells 20 are arranged side by side along a first direction X, each battery cell 20 in the plurality of battery cells 20 comprises a first surface 25 oppositely arranged along the first direction X and two second surfaces 26 oppositely arranged along a second direction Y, and the second direction Y is intersected with the first direction X; the thermal insulation member 40 is used for isolating the two adjacent battery cells 20, the thermal insulation member 40 includes a main body portion 41 and a first extension portion 42 which are connected with each other, the main body portion 41 is attached to the first surface 25, and the first extension portion 42 covers at least a connection portion of the first surface 25 and the second surface 26 of the portion.

The heat insulating member 40 is a structure prepared by a heat insulating material, which may be silica gel, mica, silica aerogel, or the like. The heat insulating member 40 may be fixed between the adjacent battery cells 20 by adhesive bonding. The adhesive is, for example, a heat-resistant adhesive, and has high adhesion reliability. The heat-resistant glue can be heat-conducting silica gel, epoxy resins, phosphates, polyimides or phenolic resins. Of course, the heat insulating member 40 may be clamped between the adjacent battery cells 20 by an external force, for example, a plurality of battery cells 20 arranged side by side are fastened by a band, and the adjacent battery cells 20 exert a clamping force on the heat insulating member 40.

It will be understood by those skilled in the art that the first surface 25 and the second surface 26 may be the surfaces of the housing 22 or the end cap 21 of the battery cell 20, but other functional components may be disposed outside the housing 22 or the end cap 21 of the battery cell 20. For example, in one embodiment, the outer side of the housing 22 is further covered with a blue film (not shown) to improve the insulation of the battery cell 20, and the first surface 25 and the second surface 26 are surfaces of the blue film far away from the housing 22. The first surface 25 may be a flat surface having the largest area among the battery cells 20. The second surface 26 may be any surface disposed non-parallel to the first surface 25, such as a top surface exposing the electrode terminal 21a, a bottom surface disposed opposite the top surface, or a side surface connecting the top surface and the bottom surface. In the embodiment shown in fig. 4, the second surface 26 is a side oppositely disposed along the Y-axis.

In the thermal insulation member 40, the main body 41 has the same size and shape as the first surface 25, the first extension 42 extends from the main body 41 and covers at least a part of the joint between the first surface 25 and the second surface 26, so that even if the thermal insulation member 40 is assembled by a worker and has a certain deviation from the first surface 25, the edge of the first surface 25 close to the first extension 42 can be covered by the thermal insulation member 40 due to the existence of the first extension 42, and the first surfaces 25 of the adjacent battery cells 20 are all filled with the thermal insulation member 40 without leaving a vacant gap. Under the action of external force on the battery cells 20, for example, under the action of the fastening force provided by the belt band, the first surfaces 25 of the adjacent battery cells 20 exert force mutually through the heat insulation member 40, and since the first surfaces 25 are in contact with the heat insulation member 40 at all places, the deformation of the first surfaces 25 when the battery cells 20 are pressed due to the fact that the heat insulation member 40 only covers part of the first surfaces 25 is avoided, and the electrochemical performance of the battery cells 20 is improved.

In the technical scheme of the embodiment of the application, the heat insulation piece 40 is arranged between the battery single cells 20, so that the heat conduction between the battery single cells 20 can be effectively reduced; on one hand, by attaching the main body part 41 to the first surface 25 and extending the first extension part 42 connected with the main body part 41 to the connection part of the first surface 25 and the second surface 26, the first surface 25 can be covered by the thermal insulation member 40 in the assembled battery 100, and when the battery cell 20 is in thermal runaway, the heat transfer to the adjacent battery cell 20 can be reduced, and the thermal spread can be reduced; on the other hand, the first extension 42 covers at least the joint of the first surface 25 and the second surface 26 of the part, so that even if there is assembly tolerance, the thermal insulation member 40 can be ensured to completely cover the first surface 25, and the first surface 25 is prevented from being deformed when the thermal insulation member 40 only covers the part of the first surface 25, so that the electrochemical performance of the battery cell 20 is improved.

At least a portion of the first extension 42 is bent and attached to the second surface 26. It will be appreciated by those skilled in the art that the first extension 42 may be attached to the second surface 26 of the battery cell 20 by an adhesive. In one embodiment, the heat insulating member 40 is provided with an adhesive layer 44, and the heat insulating member 40 is adhered to the battery cell 20 by the adhesive layer 44. During assembly, a worker can attach the heat insulating member 40 to the battery cell 20 directly through the adhesive layer 44, thereby improving assembly efficiency.

The main body portion 41 may be disposed along the first direction X and may be attached to the first surface 25, the first extension portion 42 may be bent according to the shape of the battery cell 20 such that the first extension portion 42 is fitted to the shape of the battery cell 20, and at least a portion of the first extension portion 42 may be disposed along the second direction Y, which is attached to the second surface 26. The first extension 42 is attached to the second surface 26 such that the thermal shield 40 can thermally protect both the first surface 25 and the second surface 26, reducing thermal spread. When one or more battery cells 20 are out of control due to heat, one heat insulation member 40 can simultaneously perform heat insulation protection on a plurality of surfaces of the battery cells 20, and effectively prevent the heat from spreading from a faulty battery cell 20 to a normal battery cell 20.

Referring to fig. 7 and 8, the heat insulating member 40 may be made of a heat insulating material with a certain deformation capability, the heat insulating member 40 may have a flat state and a bent assembly state, and when the heat insulating member 40 is not assembled with the battery cell 20, the heat insulating member 40 may be in the flat state to facilitate storage and transportation, for example, as shown in fig. 7, the main body portion 41 and the first extending portion 42 are in the same plane. During assembly, a worker may attach the main body portion 41 to the first surface 25, and then bend the first extending portion 42, so that the first extending portion 42 and the main body portion 41 form an included angle, and the first extending portion 42 may be attached to the second surface 26.

The thickness of the first extension portion 42 is less than or equal to the thickness of the main body portion 41. Under the condition of the same material, the thicker the thickness of the heat insulation member 40, the better the heat insulation effect, so the person skilled in the art can determine the thickness of the main body portion 41 by himself to ensure that the heat insulation effect of the main body portion 41 on the first surface 25 is satisfactory. Since the thickness of the heat insulator 40 also affects the overall volume of the battery 100, the thickness of the first extension 42 can be made thinner to reduce the overall size of the battery 100. In some embodiments, since the first extending portion 42 needs to be bent, and the first extending portion 42 is not bent due to its too thick thickness, the thickness of the first extending portion 42 may be smaller than that of the main body portion 41. It will be understood by those skilled in the art that the first extension portion 42 may have the same thickness as the main body portion 41 without affecting the bending of the first extension portion 42, so that the first extension portion 42 has the same heat insulation effect as the main body portion 41.

The junction of the first surface 25 and the second surface 26 may be in the form of a curved surface, and the junction of the first surface 25 and the second surface 26 may also be in the form of a broken line. In one embodiment, the battery cell 20 further includes a transition surface 27, the transition surface 27 connects the first surface 25 and the second surface 26, and the transition surface 27 is at least partially a curved surface; the first extension 42 comprises a first portion 421 and a second portion 422, the first portion 421 being attached to the second surface 26 and the second portion 422 being attached to the transition surface 27. The first portion 421 is attached to the second surface 26, and the second portion 422 is attached to the transition surface 27, that is, the first extending portion 42 is attached to both the second surface 26 and the transition surface 27, so that the contact area between the battery cell 20 and the first extending portion 42 is increased, the heat insulating member 40 and the battery cell 20 are more firmly fixed, the problem that the heat insulating member 40 falls off from the battery cell 20 is avoided, and the use stability and the safety of the battery cell 20 are improved.

The thickness of the first portion 421 is smaller than that of the second portion 422, and in order to reduce the overall size of the battery 100, the thickness of the first portion 421 may be set to be smaller than that of the second portion 422; meanwhile, because the transition surfaces 27 are cambered surfaces, gaps formed between the transition surfaces 27 of the adjacent battery cells 20 are larger than gaps formed between the first surfaces 25, and the second parts 422 with thicker thicknesses can be accommodated. In the flat state of the heat insulation member 40, the thickness of the second portion 422 may be gradually reduced along the main body portion 41 to the first portion 421, so that the thicknesses between the main body portion 41 and the second portion 422 and between the first portion 421 and the second portion 422 sequentially change, thereby facilitating preparation.

Referring to fig. 9 and 10 in combination, in an embodiment, the first extension portion 42 includes two first portions 421 and two second portions 422, the two first portions 421 are respectively attached to the second surfaces 26 of the two battery cells 20, and the two second portions 422 are respectively attached to the transition surfaces 27 of the two battery cells 20. The thicknesses of the two first portions 421 may be the same, and the sum of the thicknesses of the two first portions 421 may be equal to the thickness of the main body portion 41, and during preparation, the insulation material only needs to be cut from the edges of the insulation material into two bifurcate structures which can be bent in different directions, and the bifurcate structures respectively form the two second portions 422 of the first extension portion 42.

One insulating member 40 has two first portions 421 and second portions 422, so that the transition surfaces 27 and the second surfaces 26 of the two battery cells 20 can be insulated by one insulating member 40.

A person skilled in the art statistically obtains a maximum assembly deviation value of the heat insulating member 40 and the first surface 25, which is a tolerance a, in advance according to a manufacturing apparatus or a finished battery 100 assembled by a manufacturing person. In one embodiment, in a flat state of the heat insulating member 40, that is, the heat insulating member 40 is in a flat state, the length of a portion of the first extension portion 42 having a thickness equal to that of the main body portion 41 in the direction from the first portion 421 to the main body portion 41 is greater than 2 times the tolerance a, so that the heat insulating member 40 can cover the first surface 25 even if one of the battery cells 20 and the heat insulating member 40 are assembled with the maximum assembly deviation value in the assembled battery 100.

The battery 100 further includes two side plates 50 and two end plates 60, the two side plates 50 are respectively located on two sides of the plurality of battery cells 20 along the second direction Y, the two end plates 60 are respectively located on two sides of the plurality of battery cells 20 along the first direction X, the two end plates 60 and the two side plates 50 are connected end to end around the plurality of battery cells 20 arranged side by side, and the first portion 421 is located between the side plates 50 and the second surface 26.

The side plates 50 may be made of a material having a greater hardness than the heat insulating member 40, thereby suppressing the degree of expansion of the battery 100 to some extent, thereby ensuring safe operation of the battery 100. The side plate 50 may be made of steel, aluminum, or the like. The side plate 50 can protect the plurality of battery cells 20 at the same time, and the first portion 421 is located between the side plate 50 and the second surface 26, so that the first portion 421 is sandwiched between the side plate 50 and the second surface 26, thereby improving the installation stability of the thermal insulating member 40. Compare with trompil perfusion insulation material from battery 100's shell among the prior art, in the scheme of this application, need not to carry out the trompil to curb plate 50, can realize setting up thermal insulation material between curb plate 50 and battery monomer 20 to guarantee that curb plate 50 has higher intensity, improve battery 100 security.

Referring to fig. 11 and 12, the first portion 421 includes an outer surface 422b away from the battery cell 20, and the second portion 422 includes a chamfered surface 423b away from the battery cell 20, and the chamfered surface 423b is flush with the outer surface 422b and abuts against the side plate 50. The first extension 42 further includes an inner surface 42a contacting the battery cell 20, the first portion 421 includes an outer surface 422b disposed opposite to the inner surface 42a, the second portion 422 includes a separation surface 421b disposed opposite to the inner surface 42a and a chamfered surface 423b, and the chamfered surface 423b connects the separation surface 421b and the outer surface 422b. After the first extending portion 42 is bent, the inner surface 42a may be matched with the angle of the transition surface 27 of the battery cell 20, and meanwhile, the chamfered surface 423b opposite to the outer surface 422b may be flush with the outer surface 422b, and the chamfered surface 423b may abut against the side plate 50, so as to increase the contact area between the first extending portion 42 and the side plate 50, and thus the first extending portion 42 is better attached to the side plate 50.

Referring to fig. 13 and 14, two first extending portions 42 are provided, and the two first extending portions 42 are respectively connected to two opposite ends of the main body portion 41. The two first extensions 42 may be attached to two oppositely disposed second surfaces 26 of the same battery cell 20 to thermally insulate the two second surfaces 26 of the same battery cell 20. As shown in fig. 13, the main body portion 41 and the two first extension portions 42 surround the battery cell 20 in a "C" shape. The two first extensions 42 may also be attached to the second surfaces 26 of different battery cells 20, respectively, to insulate the second surfaces 26 of the two battery cells 20. As shown in fig. 14, the main body portion 41 and the two first extending portions 42 are arranged in an S shape. In the case where the first extension 42 has two first portions 421 and second portions 422, one thermal insulator 40 has 4 first portions 421,4 to which the 4 first portions 421 are attached to the 4 second surfaces 26 of the two adjacent battery cells 20, respectively. In the case that the number of the battery cells 20 in the battery 100 is greater than 2, in order to ensure that the thermal insulation members 40 are disposed between each adjacent battery cell 20, it may be further provided that the first portions 421 of the two thermal insulation members 40 are attached to the same second surface 26 of the battery cell 20, and only the lengths of the two first portions 421 attached to the same second surface 26 need to be adjusted so that the two first portions 421 do not interfere with each other and the surfaces of the two first portions 421 contacting the side plates 50 are flush.

Referring to fig. 15 to 18, in another embodiment, the battery cell 20 includes two third surfaces 28 oppositely disposed along a third direction Z, and the third direction Z intersects with both the first direction X and the second direction Y; the thermal insulation member 40 further includes a second extension 43 extending from an end of the main body portion 41 along the third direction Z, the second extension 43 covering at least a portion of a junction of the first surface 25 and the third surface 28.

It will be appreciated by those skilled in the art that the third surface 28 may be a top and/or bottom surface disposed in the Z direction as shown, for example, in fig. 16. By providing the first extension portion 42 and the second extension portion 43, it is possible to thermally insulate and protect a plurality of surfaces of the battery cell 20. It is understood that the second extension 43 may be provided with a third portion 43a attached on the third surface 28 with reference to the first extension 42, and two third portions 43a are provided to be respectively attached to two adjacent battery cells 20. Two second extending portions 43 may be further provided to be connected to opposite ends of the main body portion 41, so as to thermally insulate and protect the two third surfaces 28 of the battery cells 20 through the two second extending portions 43.

In one embodiment, the surface of the patch 24 facing away from the housing 22 is the third surface 28, and the second extension 43 is attached to the patch 24. The second extension 43 is attached to the patch 24 so that the thermal insulator 40 can insulate the top end of the battery cell 20. The second extension 43 may not have a similar structure as the second portion 422 as compared to the first extension 42, since the edge of the patch 24 does not have a curved transition. When the second extension 43 is manufactured, the insulating material may be directly separated from the edge of the insulating material, so that the insulating material has a bifurcated structure that can be bent in different directions, which is two second extensions 43 for attaching to the patches 24 of different battery cells 20.

According to some embodiments of the present application, the present application further provides an electric device, including the battery 100 of any of the above aspects, and the battery 100 is used for providing electric energy for the electric device.

The powered device may be any of the aforementioned devices or systems that employ battery 100.

According to some embodiments of the present application, referring to fig. 4 to 6, the present application provides a battery 100 including a plurality of battery cells 20 and a heat insulator 40, the plurality of battery cells 20 being arranged side by side along a first direction X, each of the plurality of battery cells 20 including a first surface 25 oppositely arranged along the first direction X and two second surfaces 26 oppositely arranged along a second direction Y; the heat insulation member 40 is used for isolating two adjacent battery cells 20, so that heat conduction between the battery cells 20 can be effectively reduced; the thermal insulation member 40 comprises a main body part 41 and a first extension part 42 which are connected with each other, the main body part 41 is attached to the first surface 25, the first extension part 42 at least covers the connection part of the first surface 25 and the second surface 26 of the part, so that in the assembled battery 100, the first surface 25 can be covered by the thermal insulation member 40, and when the thermal runaway of the battery cell 20 occurs, the heat transfer to the adjacent battery cell 20 can be reduced, the heat spreading can be reduced, and the safety performance of the battery 100 can be improved; on the other hand, the first extension 42 covers at least the joint of the first surface 25 and the second surface 26 of the part, so that even if there is assembly tolerance, the thermal insulation member 40 can be ensured to completely cover the first surface 25, and the first surface 25 is prevented from being deformed when the thermal insulation member 40 only covers the part of the first surface 25, so that the electrochemical performance of the battery cell 20 is improved.

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; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. 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 rather to cover all embodiments falling within the scope of the appended claims.

Claims

1. A battery, comprising:

the battery pack comprises a plurality of battery cells, a first electrode and a second electrode, wherein the battery cells are arranged side by side along a first direction, each battery cell in the plurality of battery cells comprises a first surface oppositely arranged along the first direction and two second surfaces oppositely arranged along a second direction, and the second direction is intersected with the first direction;

the thermal insulation piece is used for isolating two adjacent battery cells and comprises a main body part and a first extending part which are connected with each other, the main body part is attached to the first surface, and the first extending part at least covers the joint of the first surface and the second surface of the part.

2. The battery of claim 1, wherein at least a portion of the first extension is bent and attached to the second surface.

3. The battery of claim 1, wherein the first extension has a thickness less than or equal to a thickness of the body portion.

4. The battery of claim 2, wherein the battery cell further comprises a transition surface, wherein the transition surface connects the first surface and the second surface, and wherein the transition surface is at least partially an arc surface;

the first extension includes a first portion attached to the second surface and a second portion attached to the transition surface.

5. The battery of claim 4, wherein the first portion has a thickness less than a thickness of the second portion.

6. The battery of claim 4, wherein the first extension comprises two of the first portions and two of the second portions, the two of the first portions being attached to the second surfaces of the two battery cells, respectively, and the two of the second portions being attached to the transition surfaces of the two battery cells, respectively.

7. The battery of claim 4, further comprising two side plates respectively located on two sides of the plurality of battery cells in the second direction, wherein the first portion is located between the side plates and the second surface.

8. The battery of claim 7, wherein the first portion includes an outer surface distal from the battery cell and the second portion includes a chamfered surface distal from the battery cell that is flush with the outer surface and abuts the side plate.

9. The battery of any one of claims 1-8, wherein there are two first extensions, and the two first extensions are connected to two opposite ends of the main body portion, respectively.

10. The battery according to claim 1,

the battery cell comprises two third surfaces which are oppositely arranged along a third direction, and the third direction is intersected with the first direction and the second direction;

the heat insulator further includes a second extension extending from an end of the main body in the third direction, the second extension covering at least a portion where the first surface and the third surface of the portion are connected.

11. The battery of claim 10, wherein the battery cell further comprises:

the end cover and the shell form a containing cavity;

an electrode assembly disposed within the receiving cavity;

a patch attached to a side of the end cap remote from the housing, a surface of the patch facing away from the housing being the third surface, the second extension being attached to the patch.

12. The battery according to claim 1, wherein an adhesive layer is provided on the heat insulator, and the heat insulator is bonded to the battery cell by the adhesive layer.

13. An electric device, characterized in that it comprises a battery according to any one of claims 1 to 12, for providing electric energy.