CN216120530U - Batteries and Electrical Devices - Google Patents

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

Batteries and Electrical Devices

technical field

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

Background technique

Battery cells are widely used in electronic equipment, such as mobile phones, notebook computers, battery cars, electric vehicles, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, and electric tools, etc. The battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.

In order to meet the voltage and current requirements of electronic equipment, a plurality of battery cells are usually assembled into groups to form a battery. In the development of battery technology, in addition to improving the performance of the battery, the safety issue is also a problem that cannot be ignored. If the safety of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the safety of the battery is an urgent technical problem to be solved in the battery technology.

Utility model content

The embodiments of the present application provide a battery and an electrical device, which can improve the safety of the battery.

In a first aspect, the present application provides a battery, comprising a plurality of battery cells and a heat insulating member, the plurality of battery cells are arranged side by side along a first direction, and each battery cell of the plurality of battery cells includes The first surface arranged oppositely in the direction and the two second surfaces arranged oppositely along the second direction, the second direction intersecting the first direction; the heat insulating member is used to isolate two adjacent battery cells, and the heat insulating member includes a mutual A main body portion and a first extension portion are connected, the main body portion is attached to the first surface, and the first extension portion covers at least part of the junction of the first surface and the second surface.

In some embodiments, heat conduction between the battery cells can be effectively reduced by disposing a heat insulating member between the battery cells; The first extension part is attached at the junction of the first surface and the second surface, so that in the assembled battery, the first surface can be covered by the heat insulating member, which can reduce the heat to the adjacent battery cell when thermal runaway occurs in the battery cell. On the other hand, the first extension part covers at least part of the junction of the first surface and the second surface, so that even with assembly tolerances, heat insulation can be ensured The first surface is completely covered by the heat insulating element, so as to avoid the deformation of the first surface when the battery cell is squeezed due to only covering part of the first surface by the heat insulating member, thereby improving the electrochemical performance of the battery cell.

In some embodiments, at least a portion of the first extension is bent and attached to the second surface. The first extension part is bent, so that the first extension part and the second surface can be attached, and the first extension part and the second surface can be attached, so that the heat insulating member can insulate the first surface and the second surface, reducing the heat spread.

In some embodiments, the thickness of the first extension portion is less than or equal to the thickness of the body portion. Making the thickness of the first extension part thinner can reduce the overall size of the battery.

In some embodiments, the battery cell further includes a transition surface connecting the first surface and the second surface, and the transition surface is at least partially arcuate; the first extension includes a first portion and a second portion, the first portion is attached At the second surface, the second portion is attached to the transition surface. By arranging the first part and the second part, and arranging that the first part is attached to the second surface and the second part is attached to the transition surface, the first extension part is adapted to the shape of the battery cell, and the first extension part can also Insulate the second surface to reduce heat spread; the first extension part is attached to the second surface and the transition surface to increase the contact area between the battery cell and the first extension part, so that the heat insulator is fixed to the battery cell It is more reliable, avoids the problem of the heat insulating member falling off from the battery cell, and improves the stability and safety of the battery cell in use.

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; since the transition surface is an arc surface, there is a certain space between the transition surfaces of adjacent battery cells, which can accommodate the thickness of the battery cell. Thick second part; in fact, during the manufacturing process, the heat insulating element can be an integrally formed structure, and the thickness of the second part is set between the main body part and the first part, which is convenient for manufacture.

In some embodiments, the first extension includes two first portions and two second portions, the two first portions are respectively attached to the second surfaces of the two battery cells, and the two second portions are respectively attached to the two battery cells. transition surface of each battery cell. A heat shield has two first parts and a second part, so that the transition surface and the second surface of the two battery cells can be insulated by one heat shield.

In some embodiments, the battery further includes two side plates, the two side plates are respectively located on both sides of the plurality of battery cells along the second direction, and the first part is located between the side plates and the second surface. The first part is located between the side plate and the second surface, so that the first part is sandwiched between the side plate and the second surface, which improves the installation stability of the heat insulating member.

In some embodiments, the first portion includes an outer surface away from the battery cell, and the second portion includes a chamfered surface away from the battery cell, the chamfered surface being flush with the outer surface and abutting with the side plate. By setting the chamfered surface to abut against the side plate, the contact area between the first extension portion and the side plate is increased, so that the first extension portion can better fit the side plate.

In some embodiments, there are two first extension parts, and the two first extension parts are respectively connected with two oppositely disposed end parts of the main body part. The two first extensions may thermally insulate the second surfaces of the same battery cell or the 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 insulator also includes a second extension extending from an end of the body portion in the third direction, the second extension covering at least part of the junction of the first surface and the third surface. Through the provision of the second extension portion, it is achieved that the edge of the first surface close to the second extension portion must be covered by the heat insulating member.

In some embodiments, the battery cell further includes: an end cap, a casing, an electrode assembly and a patch, the end cap and the casing form an accommodation cavity; the electrode assembly is arranged in the accommodation chamber; the patch is attached to a part of the end cap away from the casing On the side, the surface of the patch facing away from the housing is the third surface, and the second extension is attached to the patch. The second extension is attached to the patch to insulate the top end of the battery cell.

In some embodiments, an adhesive layer is provided on the heat insulating member, and the heat insulating member is bonded to the battery cell through the adhesive layer, so as to facilitate the assembly of the battery cell and the heat insulating member.

In a second aspect, the present application provides an electrical device, the electrical device includes the above-mentioned battery, and the battery is used to provide electrical energy.

The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description, and in order to make the above-mentioned and other purposes, features and advantages of the present application more obvious and easy to understand , and the specific embodiments of the present application are listed below.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the drawings required in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

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

2 is a schematic diagram of an exploded structure of a battery according to some embodiments of the present application;

3 is a schematic diagram of an exploded structure of a battery cell according to some embodiments of the present application;

4 is a schematic diagram of an exploded structure of batteries according to other embodiments of the present application;

5 is a schematic top-view structural diagram of a battery according to some embodiments of the present application;

Fig. 6 is the enlarged structure schematic diagram of A part shown in Fig. 5;

FIG. 7 is a schematic three-dimensional structure diagram of a flat state of the heat insulating element according to some embodiments of the present application;

Fig. 8 is the enlarged structural schematic diagram of part B shown in Fig. 7;

FIG. 9 is a schematic cross-sectional structural diagram of the heat insulating member in a flat state according to some embodiments of the present application;

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

FIG. 11 is a schematic cross-sectional structural diagram of the heat insulating element in a flat state according to other embodiments of the present application;

12 is a partial cross-sectional structural schematic diagram of batteries according to other embodiments of the present application;

13 is a schematic top-view structural diagram of a battery according to another embodiment of the present application;

14 is a schematic top-view structural diagram of a battery according to further embodiments of the present application;

15 is a schematic diagram of an exploded structure of a battery according to further embodiments of the present application;

16 is a schematic cross-sectional structure diagram of a battery according to some embodiments of the present application;

Fig. 17 is the enlarged structural schematic diagram of C part shown in Fig. 16;

FIG. 18 is a schematic cross-sectional structural diagram of the heat insulating element in a flat state according to further embodiments of the present application.

The reference numbers are as follows:

vehicle 1000;

battery 100, controller 200, motor 300;

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

heat insulator 40; main body 41; first extension 42; first part 421; second part 422; inner surface 42a; partition surface 421b; outer surface 422b; chamfered surface 423b; second extension 43; third part 43a; adhesive layer 44;

Side plate 50; End plate 60.

Detailed ways

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application by way of example, but should not be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside" is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present application. Application restrictions. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance. "Vertical" is not strictly vertical, but within the allowable range of errors. "Parallel" is not strictly parallel, but within the allowable range of errors.

Reference in this application 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 a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

Orientation words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present application. In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cell may be in the form of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which are not limited in the embodiments of the present application. The battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square-shaped battery cells, and soft-pack battery cells, which are not limited in the embodiments of the present application.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the batteries mentioned in this application may include battery modules or battery packs, and the like. Batteries typically include a case for enclosing one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive and negative plates to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the current collector without the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer, and the positive electrode active material layer is not coated. The current collectors coated with the positive electrode active material layer are stacked and used as positive electrode tabs. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganate. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the current collector without the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer, The current collectors coated with the negative electrode active material layer are stacked and used as negative electrode tabs. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), and the like. In addition, the electrode assembly may be a wound structure or a laminated structure, and the embodiment of the present application is not limited thereto.

The inventors have noticed that, in the current battery, a box needs to be arranged to place one or more battery cells, and a heat insulating member needs to be arranged between adjacent battery cells to reduce the thermal influence between the battery cells. The first surface of the battery cell in contact with the heat insulator is the same size as the heat insulator, so that the first surface can theoretically be completely covered by the heat insulator, but due to manufacturing tolerances or assembly tolerances, in the assembled product, Each edge of the first surface cannot be completely coincident with the edge of the heat insulating member, and an empty gap is formed between the edges of adjacent battery cells that fail to adhere to the heat insulating member. After further research, it was found that when the battery cell is squeezed by external force, the part of the battery cell corresponding to the gap cannot transmit the force to another battery cell through the heat insulation piece, so that the part of the battery cell corresponding to the heat insulation piece cannot transmit the force to the other battery cell. Some are prone to deformation, which affects the electrochemical performance of the battery cell.

In order to solve the problem that the battery cell is easily deformed under the action of external force due to the insulator being unable to completely coincide with the first surface, which affects the electrochemistry of the battery cell, the inventor has designed a battery through in-depth research. A plurality of battery cells are arranged side by side along the first direction, and a heat insulating member is arranged to isolate two adjacent battery cells, so that heat conduction between the battery cells can be effectively reduced; the first surface and two second surfaces oppositely disposed along the second direction, the heat insulator includes a main body part and a first extension part which are connected to each other, the main body part is attached to the first surface, and the first extension part covers at least part of the The connection between the first surface and the second surface makes the assembled battery, the first surface can be covered by the heat insulating material, when the thermal runaway occurs in the battery cell, the heat transfer to the adjacent battery cells can be reduced, reducing the heat spread; on the other hand, the first extension covers at least part of the junction of the first surface and the second surface, so that even with assembly tolerances, it is possible to ensure that the insulator completely covers the first surface, avoiding that the insulator only covers Part of the first surface causes the first surface to deform when the battery cell is squeezed, thereby improving the electrochemical performance of the battery cell.

The battery cells disclosed in the embodiments of the present application may be used, but not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells, batteries, etc. disclosed in the present application can be used to form the electrical device, which is beneficial to improve the stability of battery performance and battery life.

The embodiment of the present application provides an electrical device using a battery as a power source, and the electrical 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 vehicle, a ship, a spacecraft, and the like. The electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spaceships.

In the following embodiments, for the convenience of description, a vehicle 1000 according to an embodiment of the present application is used as an example for description.

Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The interior of the vehicle 1000 is provided with the battery 100 , and the battery 100 may be provided at the bottom or the head or the rear of the vehicle 1000 . The battery 100 may be used for power supply of the vehicle 1000 , for example, the battery 100 may be used as an operating power source of the vehicle 1000 . The vehicle 1000 may also include a controller 200 and a motor 300 for controlling the battery 100 to supply power to the motor 300 , eg, for starting, navigating, and running the vehicle 1000 for work power requirements.

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

Please refer to FIG. 2 , which is an exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 includes a case and battery cells 20 . In some embodiments, the box body 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 an accommodation space for accommodating the battery cells 20 . The lower cover 30 may be a hollow structure with one end open, the upper cover 10 may be a plate-like structure, and the upper cover 10 is covered with the opening side of the lower cover 30, so that the upper cover 10 and the lower cover 30 jointly define a accommodating space; Both the 10 and the lower cover 30 may be hollow structures with one side open, and the opening side of the upper cover 10 is covered with the opening side of the lower cover 30 . Of course, the box formed by the upper cover 10 and the lower cover 30 may be in various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100 , there may be a plurality of battery cells 20 , and the plurality of battery cells 20 may be connected in series or in parallel or in a mixed connection. A mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 can be accommodated in the box; of course, the battery 100 can also be connected in series with a plurality of battery cells 20 first. A battery module is formed in parallel or in a mixed connection, and a plurality of battery modules are connected in series or in parallel or in a mixed connection to form a whole, and are accommodated in the box. The battery 100 may also include other structures, for example, the battery 100 may further include a bus component for realizing electrical connection between the plurality of battery cells 20 .

Wherein, each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cells 20 may be cylindrical, flat, rectangular, or other shapes.

Please refer to FIG. 3 , which is a schematic diagram of an exploded structure of a battery cell 20 according to some embodiments of the present application. 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 casing 22 , an electrode assembly 23 , a patch 24 and other functional components.

The end cap 21 refers to a component that covers the opening of the casing 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22 . Optionally, the end cover 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 21 is not easily deformed when it is squeezed and collided, so that the battery cell 20 can have a higher strength. Structural strength and safety performance can also be improved. Functional components such as electrode terminals 21 a may be provided on the end cap 21 . The electrode terminal 21 a may be used for electrical connection with the electrode assembly 23 for outputting or inputting electric energy of the battery cell 20 . In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism for releasing 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, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, an insulating member may also be provided on the inner side of the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21, so as to reduce the risk of short circuit. Illustratively, the insulating member may be plastic, rubber, or the like.

The housing 22 is an assembly used to cooperate with the end cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte, and other components. The casing 22 and the end cap 21 may be independent components, and an opening may be provided on the casing 22 , and the inner environment of the battery cell 20 may be formed by covering the opening with the end cap 21 at the opening. Without limitation, the end cap 21 and the outer shell 22 can also be integrated. Specifically, the end cap 21 and the outer shell 22 can form a common connection surface before other components are put into the shell. The end cap 21 is closed with the casing 22 . The housing 22 can be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal, and the like. Specifically, the shape of the casing 22 can be determined according to the specific shape and size of the electrode assembly 23 . The material of the casing 22 may be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly 23 is a part in which an electrochemical reaction occurs 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 usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet with active material constitute the main body of the electrode assembly 23 , and the portions of the positive electrode sheet and the negative electrode sheet without active material constitute tabs, respectively. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at two ends of the main body respectively. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals 21a to form a current loop.

The patch 24 can prevent external sharp foreign objects from piercing the end cap 21 or external liquid from entering the housing 22 . The patch 24 can be made of PE (Polyethylen, polyethylene), PVC (Polyethylene, polyvinyl chloride), PPS (Phenylenesulfide, polyphenylene sulfide), PET (Polyethylene terephthalate, polyterephthalate), PP (Polypropylene, polypropylene) ), nylon and ABS (Acrylonitrile Butadiene Styreneplastic, acrylonitrile-butadiene-styrene) materials, one or more of the materials, so as to insulate the end caps 21 of the battery cells 20, so that the safety performance of the battery cells 20 can be improved.

According to some embodiments of the present application, please refer to FIG. 4 to FIG. 6 together, wherein FIG. 4 is a schematic diagram of an exploded structure of a battery according to some embodiments of the present application; FIG. 5 is a schematic top-view structure diagram of a battery according to some embodiments of the present application; FIG. 6 is an enlarged schematic view of the structure of part A shown in FIG. 5 . The present application provides a battery 100, including a plurality of battery cells 20 and a heat insulating member 40, the plurality of battery cells 20 are arranged side by side along a first direction X, and each battery cell 20 of the plurality of battery cells 20 includes The first surface 25 oppositely arranged along the first direction X and the two second surfaces 26 oppositely arranged along the second direction Y, the second direction Y intersects the first direction X; the heat insulating member 40 is used to isolate the adjacent two. Each battery cell 20, the heat insulator 40 includes a main body portion 41 and a first extension portion 42 that are connected to each other, the main body portion 41 is attached to the first surface 25, and the first extension portion 42 covers at least part of the first surface 25 and the first extension portion 42. The junction of the two surfaces 26 .

The heat insulating member 40 is a structure prepared by a heat insulating material, and the heat insulating material may be silica gel, mica, or silica aerogel or the like. The heat insulating member 40 may be fixed between the adjacent battery cells 20 by adhesive bonding. As the colloid, for example, a heat-resistant adhesive is used, and its bonding reliability is high. The heat-resistant adhesive can be thermally conductive silica gel, epoxy resin, phosphate, polyimide or phenolic resin. Of course, the heat insulation member 40 can also be clamped between the adjacent battery cells 20 by 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 clamp the heat insulation member 40 hold.

Those skilled in the art can understand that the first surface 25 and the second surface 26 may be the surfaces of the outer shell 22 or the end cover 21 of the battery cell 20 , and of course the outer side of the outer shell 22 or the end cover 21 of the battery cell 20 may also be provided other functional parts. For example, in one embodiment, the outer side of the casing 22 is also covered with a blue film (not shown) to improve the insulation of the battery cells 20 . Specifically, the first surface 25 may be a flat surface with the largest area in the battery cell 20 . The second surface 26 may be any surface disposed non-parallel to the first surface 25 , such as the top surface exposing the electrode terminals 21 a , the bottom surface opposite the top surface, or the side connecting the top surface and the bottom surface. In the embodiment shown in FIG. 4 , the second surface 26 is a side surface disposed opposite along the Y axis.

In the heat insulator 40 , the main body portion 41 has the same size and shape as the first surface 25 , and the first extension portion 42 extends from the main body portion 41 and covers at least part of the connection between the first surface 25 and the second surface 26 . , so that even if the assembled heat insulation element 40 has a certain deviation from the first surface 25 when assembling, due to the existence of the first extension part 42, the edge of the first surface 25 close to the first extension part 42 can also be blocked by the heat insulation element 40 is covered, and the first surfaces 25 of adjacent battery cells 20 are completely filled by the heat insulating member 40, leaving no vacant gap. Under the action of the external force on the battery cells 20, such as the tightening force provided by the aforementioned band, the first surfaces 25 of the adjacent battery cells 20 exert force on each other through the heat insulating member 40. All parts are in contact with the heat insulator 40 to prevent the heat insulator 40 from covering only part of the first surface 25 , resulting in deformation of the first surface 25 when the battery cell 20 is squeezed, thereby improving the electrochemical performance of the battery cell 20 .

In the technical solution of the embodiment of the present application, by disposing the heat insulating member 40 between the battery cells 20, the heat conduction between the battery cells 20 can be effectively reduced; on the one hand, by attaching the main body portion 41 to the first surface 25. Extend the first extension portion 42 connected with the main body portion 41 to the junction of the first surface 25 and the second surface 26, so that in the assembled battery 100, the first surface 25 can be covered by the heat insulating member 40, When the battery cells 20 are thermally out of control, the heat transfer to the adjacent battery cells 20 can be reduced, and the heat spread can be reduced; on the other hand, the first extension portion 42 at least covers part of the connection between the first surface 25 and the second surface 26 In this way, even if there are assembly tolerances, it can be ensured that the heat insulating member 40 completely covers the first surface 25, so as to avoid the deformation of the first surface 25 caused by the heat insulating member 40 only covering part of the first surface 25 when the battery cell 20 is squeezed , thereby improving the electrochemical performance of the battery cell 20 .

At least a portion of the first extension 42 is bent and attached to the second surface 26 . It will be understood 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, an adhesive layer 44 is disposed on the heat insulating member 40 , and the heat insulating member 40 is bonded to the battery cells 20 through the adhesive layer 44 . During assembly, the processing personnel can directly attach the heat insulating member 40 to the battery cell 20 through the adhesive layer 44 to improve assembly efficiency.

The main body portion 41 may be disposed along the first direction X and be attached to the first surface 25 , and the first extension portion 42 may be bent according to the shape of the battery cell 20 , so that the first extension portion 42 is connected to the battery cell 20 . If the shape of the first extension 42 is adapted, at least a portion of the first extension 42 may be provided along the second direction Y, the portion of which is attached to the second surface 26 . The first extension 42 is attached to the second surface 26 so that the insulator 40 can thermally protect both the first surface 25 and the second surface 26, reducing heat spread. When one or several battery cells 20 are thermally out of control, a heat insulating member 40 can simultaneously perform thermal insulation protection on multiple surfaces of the battery cells 20, effectively preventing heat from passing from the faulty battery cells 20 to the normal battery cells. 20 spread.

Please refer to FIG. 7 and FIG. 8 , the heat insulating member 40 may be made of a heat insulating material with a certain deformability. The heat insulating member 40 may have a flat state and a bent assembly state, and the heat insulating member 40 is not connected to the battery cells. When assembled, the heat insulating member 40 can be in a flat state to facilitate storage and transportation. For example, as shown in FIG. 7 , the main body portion 41 and the first extension portion 42 are in the same plane. When assembling, the worker can first attach the main body 41 to the first surface 25, and then bend the first extension 42, so that the first extension 42 and the main body 41 are arranged at an angle, and the first extension 42 can be connected with the first extension 42. The second surface 26 is attached.

The thickness of the first extension part 42 is smaller than or equal to the thickness of the main body part 41 . In the case of the same material, the thicker the thickness of the heat insulating member 40, the better the heat insulating effect. Therefore, those skilled in the art can determine the thickness of the main body portion 41 to ensure the heat insulating effect of the main body portion 41 on the first surface 25. meet demand. The thickness of the heat insulating member 40 also affects the overall volume of the battery 100 , so making the thickness of the first extension portion 42 thinner can reduce the overall size of the battery 100 . In some embodiments, since the first extension portion 42 needs to be bent, and the thickness of the first extension portion 42 is too thick, it is not conducive to bending, so the thickness of the first extension portion 42 may be set to be smaller than that of the main body portion 41 . Those skilled in the art can understand that, without affecting the bending of the first extension part 42 , the first extension part 42 may have the same thickness as the main body part 41 , so that the first extension part 42 and the main body part 41 have the same spacing thermal effect.

The connection between the first surface 25 and the second surface 26 may be presented in the form of a curved surface, and the connection between the first surface 25 and the second surface 26 may also be presented 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 arcuate; the first extension portion 42 includes the first portion 421 and the The second portion 422 , the first portion 421 is attached to the second surface 26 , and the second portion 422 is attached to the transition surface 27 . The first part 421 is attached to the second surface 26 and the second part 422 is attached to the transition surface 27, ie the first extension 42 is attached to the second surface 26 and the transition surface 27, raising the battery cell 20 and the first extension The contact area of the part 42 makes the heat insulating member 40 and the battery cell 20 more firmly fixed, avoids the problem of the heat insulating member 40 falling off from the battery cell 20, and improves the stability and safety of the battery cell 20. sex.

The thickness of the first part 421 is smaller than the thickness of the second part 422. In order to reduce the overall size of the battery 100, the thickness of the first part 421 can be appropriately set to be smaller than the thickness of the second part 422; The gap formed between the transition surfaces 27 of the battery cells 20 is larger than the gap formed between the first surfaces 25 , and can accommodate the thicker second portion 422 . In the flat state of the heat insulating member 40 , along the main body portion 41 to the first portion 421 , the thickness of the second portion 422 may be gradually reduced, so that between the main body portion 41 and the second portion 422 , the first portion 421 and the second portion 422 The thickness is changed sequentially, which is convenient for preparation.

Please refer to FIG. 9 and FIG. 10 in combination, in one embodiment, the first extension part 42 includes two first parts 421 and two second parts 422 , and the two first parts 421 are respectively attached to the two battery cells 20 . The second surface 26, the two second portions 422 are attached to the transition surfaces 27 of the two battery cells 20, respectively. The thicknesses of the two first parts 421 may be the same, and the sum of the thicknesses of the two first parts 421 may be equal to the thickness of the main body part 41 . During preparation, the heat insulating material only needs to be cut from the edge of the heat insulating material into two different directions. The bifurcated structure is bent in the direction, and the bifurcated structure forms the two second portions 422 of the first extension portion 42 respectively.

A heat shield 40 has two first parts 421 and a second part 422 , so that the transition surface 27 and the second surface 26 of the two battery cells 20 can be insulated by one heat shield 40 .

Those skilled in the art obtain the maximum assembly deviation value of the heat insulator 40 and the first surface 25 according to the battery 100 assembled by the processing equipment or the processing personnel in advance, and the maximum assembly deviation value is the tolerance a. In one embodiment, when the heat insulating member 40 is in a flat state, that is, the heat insulating member 40 is in a flat state, along the direction from the first portion 421 to the main body portion 41 , the thickness of the first extension portion 42 is equal to the thickness of the main body portion 41 . The length of the part is greater than 2 times the tolerance a, so that even if a certain battery cell 20 and the heat insulator 40 are assembled with the maximum assembly deviation value in the assembled battery 100 , the heat insulator 40 can still cover the first surface 25 .

The battery 100 further includes two side plates 50 and two end plates 60, the two side plates 50 are respectively located on both sides of the plurality of battery cells 20 along the second direction Y, and the two end plates 60 are respectively located in the plurality of battery cells On both sides of 20 along the first direction X, two end plates 60 and two side plates 50 surround a plurality of side-by-side battery cells 20 , and the first portion 421 is located between the side plates 50 and the second surface 26 .

Compared with the heat insulating member 40 , the side plate 50 can be made of a material with a higher hardness, thereby restraining the expansion of the battery 100 to a certain extent, thereby ensuring that the battery 100 can work safely. The material of the side plate 50 may be steel, aluminum, or the like. The side plate 50 can protect a plurality of battery cells 20 at the same time, the first part 421 is located between the side plate 50 and the second surface 26 , so that the first part 421 is sandwiched between the side plate 50 and the second surface 26 to improve heat insulation The installation stability of the piece 40. Compared with the prior art in which the heat insulating material is poured through holes on the outer shell of the battery 100 , in the solution of the present application, there is no need to make holes in the side plate 50 , so that the spacer can be set between the side plate 50 and the battery cells 20 . heat material, thereby ensuring that the side plate 50 has high strength and improving the safety of the battery 100 .

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, the chamfered surface 423b is flush with the outer surface 422b and is opposite to the outer surface 422b. The side plate 50 abuts. The first extension portion 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, and the second portion 422 includes a separation surface 421b disposed opposite to the inner surface 42a and an inverted The corner surface 423b and the chamfered surface 423b connect the partition surface 421b and the outer surface 422b. After the first extension portion 42 is bent, the inner surface 42a can be adapted to the angle of the transition surface 27 of the battery cell 20, and the chamfered surface 423b opposite to the outer surface 422b can be flush with the outer surface 422b. The 423b can abut with the side plate 50 , thereby increasing the contact area between the first extension portion 42 and the side plate 50 , so that the first extension portion 42 can better fit the side plate 50 .

Please refer to FIG. 13 and FIG. 14 , there are two first extending portions 42 , and the two first extending portions 42 are respectively connected to two oppositely disposed ends of the main body portion 41 . The two first extensions 42 may be attached to two opposing 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 extending portions 42 surround the battery cells 20 in a “C” shape. The two first extensions 42 may also be respectively attached to the second surfaces 26 of different battery cells 20 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 extension portions 42 are arranged in an “S” shape. In the case where the first extension part 42 has two first parts 421 and two second parts 422 , one heat insulating member 40 has four first parts 421 , and the four first parts 421 are respectively connected with the four first parts 421 of the two adjacent battery cells 20 . A second surface 26 is attached. In the case where the number of battery cells 20 in the battery 100 is greater than two, in order to ensure that each adjacent battery cell 20 is provided with a heat insulating member 40 , the first portions 421 of two heat insulating members 40 may also be provided. Attached to the same second surface 26 of the battery cell 20, only the lengths of the two first parts 421 attached to the same second surface 26 need to be adjusted so that there is no interference between the two first parts 421, and the two first parts 421 is flush with the contact surface of the side plate 50 .

Referring to FIGS. 15 to 18 , in another embodiment, the battery cell 20 includes two third surfaces 28 disposed opposite to each other along a third direction Z, the third direction Z is both the first direction X and the second direction Y Intersecting; the thermal insulator 40 also includes a second extension 43 extending from the end of the body portion 41 in the third direction Z, the second extension 43 covering at least part of the junction of the first surface 25 and the third surface 28 .

Those skilled in the art can understand that the third surface 28 may be, for example, a top surface and/or a bottom surface disposed along the Z direction as shown in FIG. 16 . By arranging the first extension portion 42 and the second extension portion 43 , the plurality of surfaces of the battery cells 20 can be thermally protected. It can be understood that the second extension portion 43 can refer to the first extension portion 42 , a third portion 43 a attached to the third surface 28 is provided, and two third portions 43 a are provided with two adjacent battery cells 20 respectively. attached. Two second extension parts 43 may also be provided to connect with opposite ends of the main body part 41 , so as to provide thermal insulation protection to the two third surfaces 28 of the battery cell 20 through the two second extension parts 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 heat insulating member 40 can insulate the top end of the battery cell 20 . Since the edge of the patch 24 does not have a curved surface transition, the second extension portion 43 may not have a structure similar to the second portion 422 compared with the first extension portion 42 . When making the second extension 43, the heat insulating material can be directly separated from the edge of the heat insulating material, so that the heat insulating material has a bifurcated structure that can be bent in different directions. The second extension 43 on the patch 24 of the battery cell 20 .

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

The electrical device may be any of the aforementioned devices or systems using the battery 100 .

According to some embodiments of the present application, referring to FIGS. 4 to 6 , the present application provides a battery 100 including a plurality of battery cells 20 and a heat insulating member 40 , and the plurality of battery cells 20 are arranged side by side along the first direction X , each battery cell 20 in the plurality of battery cells 20 includes a first surface 25 arranged oppositely along the first direction X and two second surfaces 26 arranged oppositely along the second direction Y; the heat insulating member 40 is used for The two adjacent battery cells 20 are isolated, so that the heat conduction between the battery cells 20 can be effectively reduced; The surface 25 and the first extension 42 cover at least part of the junction of the first surface 25 and the second surface 26 , so that in the assembled battery 100 , the first surface 25 can be covered by the heat insulator 40 . When thermal runaway occurs, the transfer of heat to the adjacent battery cells 20 can be reduced, the heat spread can be reduced, and the safety performance of the battery 100 can be improved; on the other hand, the first extension portion 42 covers at least part of the first surface 25 and the second surface 26, so that even if there are assembly tolerances, it can ensure that the heat insulating member 40 completely covers the first surface 25, so as to prevent the heat insulating member 40 from covering only part of the first surface 25, causing the first surface of the battery cell 20 to be squeezed. 25 is deformed, thereby improving the electrochemical performance of the battery cell 20 .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. scope, which shall be included in the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (13)

1. a battery, is characterized in that, comprises: A plurality of battery cells are arranged side by side along a first direction, and each of the plurality of battery cells includes a first surface oppositely arranged along the first direction and a first surface arranged oppositely along the second direction. two second surfaces, the second direction intersecting the first direction; a heat shield for isolating two adjacent battery cells, the heat shield includes a main body part and a first extension part connected to each other, the main body part is attached to the first surface, the The first extension covers at least part of the junction of the first surface and the second surface. 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 thickness of the first extension portion is less than or equal to the thickness of the main body portion. 4 . 4. The battery according to claim 2, wherein 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 arc; 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 thickness of the first portion is smaller than the thickness of the second portion. 6. The battery of claim 4, wherein the first extension includes two of the first parts and two of the second parts, the two first parts being attached to two of the second parts, respectively The second surface of the battery cell, the two second portions are respectively attached to the transition surface of the two battery cells. 7 . The battery according to claim 4 , wherein the battery further comprises two side plates, the two side plates are respectively located on both sides of the plurality of battery cells along the second direction, 8 . The first portion is located between the side panel and the second surface. 8 . The battery of claim 7 , wherein the first portion comprises an outer surface remote from the battery cell, the second portion comprises a chamfered surface remote from the battery cell, and the inverted surface The corner surface is flush with the outer surface and abuts with the side plate. 9 . The battery according to claim 1 , wherein the number of the first extension parts is two, and the two first extension parts are respectively disposed opposite to the two parts of the main body part. 10 . end connections. 10. The battery of claim 1, wherein 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 insulator further includes a second extension extending from an end of the body portion in the third direction, the second extension covering at least part of the first and third surfaces. Junction. 11. The battery of claim 10, wherein the battery cell further comprises: an end cover and an outer shell, the end cover and the outer shell form an accommodation cavity; an electrode assembly, arranged in the accommodating cavity; a patch attached to a side of the end cap away from the casing, the surface of the patch facing away from the casing is the third surface, and the second extension part is attached to the patch. 12 . The battery according to claim 1 , wherein an adhesive layer is provided on the heat insulating member, and the heat insulating member is bonded to the battery cell through the adhesive layer. 13 . 13. An electrical device, characterized by comprising the battery according to any one of claims 1 to 12, the battery being used to provide electrical energy.

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