Battery device, electric connection assembly and electric equipment

Abstract

The utility model relates to a battery device, an electric connection assembly and electric equipment. The battery device comprises a box body, a plurality of single batteries and an electric connection assembly, the box body is provided with an accommodating space, and the single batteries are arranged in the accommodating space. The electric connection assembly comprises an electric connection sheet and an insulation assembly, the electric connection sheet is used for electrically connecting the two battery monomers, and the electric connection sheet is provided with a weak area. The insulation assembly is arranged on the outer side of the weak area, and when the weak area is broken, the insulation assembly is punctured and covers the broken portion of the electric connecting piece. The weak areas are arranged on the electric connecting sheets, so that when the battery device is collided by external force, the electric connecting sheets are broken from the weak areas, the electric connection between the battery monomers is quickly cut off, and thermal runaway is prevented from spreading between the battery monomers. And meanwhile, the insulating component is punctured to cover the broken part, so that arc discharge is quickly eliminated, and the broken electric connecting sheet is prevented from being connected again.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to battery devices, electrical connection components, and electrical equipment. Background Art

[0002] With the technological development of the new energy industry, the requirements for the safety performance of batteries are getting higher and higher. Especially in the field of new energy vehicles, the safety of batteries directly affects the safety of vehicles.

[0003] A battery device includes a plurality of battery cells, and the battery cells are connected to each other through tab pieces. During the driving of a vehicle or when it is impacted by an external force, the battery cells may be damaged and thermal runaway may occur. Moreover, the thermal runaway will spread to adjacent battery cells, resulting in thermal runaway of the entire battery device, posing a huge safety risk. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a battery device, an electrical connection component, and an electrical equipment, which can quickly cut off the electrical connection between battery cells when the battery device is impacted, thereby cutting off the current and preventing the spread of thermal runaway between battery cells.

[0005] In a first aspect, this application provides a battery device, including:

[0006] A box body, which is provided with an accommodation space;

[0007] A plurality of battery cells, arranged in the accommodation space; and

[0008] An electrical connection component, including:

[0009] An electrical connection piece, used to electrically connect two battery cells, and the electrical connection piece has a weak area;

[0010] An insulation component, arranged outside the weak area. When the weak area breaks, the insulation component is punctured and covers the broken part of the electrical connection piece.

[0011] For the battery device provided by the embodiments of this application, by setting a weak area on the electrical connection piece, when the battery device is impacted by an external force, the electrical connection piece will break from the weak area, quickly cutting off the electrical connection between battery cells, thereby cutting off the current and preventing the spread of thermal runaway between battery cells. By arranging an insulation component outside the weak area, when the weak area breaks, the insulation component will be punctured and cover the broken part, thereby quickly eliminating arcing and playing an insulating role between the broken parts to prevent the broken electrical connection pieces from reconnecting.

[0012] In some embodiments, the insulation component includes:

[0013] A housing, wrapped outside the weak area; and

[0014] A fluid insulating material is disposed inside the housing, and the housing can be punctured to release the fluid insulating material that covers the fracture site.

[0015] In the battery device provided by the embodiment of the present application, by setting the insulating component to include a housing and a fluid insulating material, under normal working conditions, the fluid insulating material is stored inside the housing. When the weak area fractures, the housing is punctured, and the fluid insulating material is released from the housing to cover the fracture site, achieving a good insulating effect.

[0016] In some embodiments, along the thickness direction of the electrical connection piece, at least one side of the electrical connection piece is provided with a groove, and the area of the electrical connection piece where the groove is provided defines a weak area.

[0017] In the battery device provided by the embodiment of the present application, by providing a groove on at least one side in the thickness direction of the electrical connection piece, the thickness of the electrical connection piece is reduced to weaken the structural strength of the electrical connection piece, achieving the function of a weak area.

[0018] In some embodiments, along the thickness direction of the electrical connection piece, the grooves located on both sides of the electrical connection piece at least partially overlap in the thickness direction.

[0019] In the battery device provided by the embodiment of the present application, by the above setting, a thinner weak area can be formed at the overlapping position of the two side grooves, so that it is more conducive to forming a fracture when subjected to an external force.

[0020] In some embodiments, when the weak area fractures, the housing is configured to be punctured by the fracture site.

[0021] In the battery device provided by the embodiment of the present application, the housing is punctured by the fracture part to release the fluid insulating material inside the housing.

[0022] In some embodiments, a piercing part is provided at the bottom of the groove. When the weak area fractures, the housing is configured to be punctured by the piercing part.

[0023] In the battery device provided by the embodiment of the present application, by providing a piercing part at the bottom of the groove, when the weak area is bent under force, the piercing part moves towards the housing and punctures the housing.

[0024] In some embodiments, the height of the piercing part is not greater than the depth of the groove.

[0025] In the battery device provided by the embodiment of the present application, by the above setting, in the normal state of the electrical connection component, the piercing part sinks into the groove and maintains a distance from the housing, and will not damage the housing, so as to avoid premature release of the fluid insulating material and resulting in solidification failure of the fluid insulating material.

[0026] In some embodiments, the height of the piercing portion is set to H, and the wall thickness of the housing is set to B;

[0027] wherein, H = 0.8*B to 1.2*B.

[0028] With the above settings, the battery device provided by the embodiments of the present application can ensure that the piercing portion pierces the housing when the electrical connection piece breaks.

[0029] In some embodiments, the groove extends along the width direction of the electrical connection piece;

[0030] The piercing portion and the groove are spaced apart from the groove wall along the extending direction of the electrical connection piece.

[0031] During the operation of the electrical connection assembly in the battery device provided by the embodiments of the present application, it is mainly subjected to an impact force in the b direction and is prone to a fracture surface along the b direction. By setting the groove to extend along the b direction, the groove has a large coverage range in the b direction, so it is easy to break quickly when being impacted.

[0032] In some embodiments, the groove wall forms an angle with the thickness direction of the electrical connection piece;

[0033] Along the extending direction of the electrical connection piece, the piercing portion is located at the middle position of the groove, so that the thickness of the weak areas on both sides of the piercing portion is smaller than the thickness of the weak area at the position of the piercing portion.

[0034] With the battery device provided by the embodiments of the present application, the groove wall is inclined, and the piercing portion is arranged at the middle position of the groove, so that weak areas with reduced thickness are formed on both sides of the piercing portion, and both sides of the piercing portion have an effect of easy fracture, improving the fracture flexibility of the weak areas. When breaking from either side of the piercing portion, the piercing portion can pierce the housing.

[0035] In some embodiments, the piercing portion extends along the width direction of the electrical connection piece to the edge of the electrical connection piece.

[0036] With the battery device provided by the embodiments of the present application, the groove penetrates the electrical connection piece along the b direction, so that it can be more easily completely broken when being impacted.

[0037] In some embodiments, the minimum thickness of the electrical connection piece in the weak area is T1, and the thickness of the area of the electrical connection piece outside the weak area is T2;

[0038] wherein, T1 = 0.4*T2 to 0.8*T2.

[0039] The battery device provided by the embodiment of the present application can ensure that the weak area has sufficient structural strength under normal working conditions within this numerical range and will not break accidentally. At the same time, it ensures that the weak area breaks when subjected to an accidental impact to quickly cut off the electrical connection between the two battery cells and prevent the spread of thermal runaway.

[0040] In some embodiments, along the extending direction of the electrical connection piece, the electrical connection piece is provided with at least two weak areas.

[0041] The battery device provided by the embodiment of the present application can increase the coverage range of the weak area, thereby improving the reliability of the weak area breaking when impacted. At the same time, the weak areas are arranged at intervals along the extending direction of the electrical connection piece. On the one hand, it ensures that different parts of the electrical connection piece break when impacted, and on the other hand, it can also ensure the structural strength of the electrical connection piece.

[0042] In some embodiments, the housing is configured with a receiving cavity for receiving a fluid insulating material, and the receiving cavity at least partially overlaps with the weak area in the thickness direction of the electrical connection piece.

[0043] The battery device provided by the embodiment of the present application can ensure that after the fluid insulating material in the receiving cavity is released, it can flow into the weak area and cover the fracture site.

[0044] In some embodiments, the electrical connection piece has a first part, a second part, and a bending part that is bent from the first part and the second part toward one side in the thickness direction;

[0045] The weak area is arranged on the bending part.

[0046] The battery device provided by the embodiment of the present application facilitates the electrical connection component to adapt to the installation space by setting the bending part. By arranging the weak area on the bending part, the fracture function can be more easily exerted, thereby ensuring the quick cutting off of the electrical connection between the two battery cells.

[0047] In some embodiments, the insulating component at least wraps the bending part.

[0048] The battery device provided by the embodiment of the present application enables the insulating component 32 to play a better insulating role through the above settings, preventing the external conductor from contacting the electrical connection piece and causing a short circuit.

[0049] In a second aspect, the present application provides an electrical connection component, which includes:

[0050] An electrical connection piece having a weak area; and

[0051] An insulating component arranged outside the weak area. When the weak area breaks, the insulating component is punctured and covers the fracture site of the electrical connection piece.

[0052] In a third aspect, the present application provides an electrical device, including the battery device provided in any of the above embodiments, and the battery device is used to provide electrical energy.

[0053] 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 specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific implementation manners of the present application. Description of the Drawings

[0054] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0055] Figure 1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0056] Figure 2 is a schematic structural diagram of a battery device provided in some embodiments of the present application;

[0057] Figure 3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0058] Figure 4 is a schematic structural diagram of an electrical connection component provided in some embodiments of the present application;

[0059] Figure 5 is a schematic cross-sectional structural diagram of an electrical connection component provided in some embodiments of the present application;

[0060] Figure 6 is Figure 5 an enlarged structural diagram of part A in

[0061] The reference numerals in the specific embodiments are as follows:

[0062] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0063] 10, box body; 11, first part; 12, second part;

[0064] 20, battery cell; 21, end cover; 22, outer shell; 23, battery core;

[0065] 30, electrical connection component; 31, electrical connection piece; 311, weak area; 312, piercing part; 313, bending part; 314, groove; 32, insulating component; 321, housing; 3212, accommodating cavity. Detailed implementation manners

[0066] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0068] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0069] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0070] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0071] In the description of the embodiments of this application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0072] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0073] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0074] At present, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as other fields. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0075] As the protection of thermal runaway spread is the key to ensuring battery safety, it is of great practical significance to develop an efficient design method for preventing and controlling thermal runaway spread. When a battery cell is damaged and thermal runaway occurs, the thermal runaway may spread to adjacent battery cells, resulting in thermal runaway of the entire battery device, posing a huge safety risk.

[0076] The inventors of the present application noticed that the electrical connection sheet is an electrical connection structure that connects multiple battery cells in series, parallel, or series-parallel to form a battery device. After the battery device is collided, the electrical connection sheets connecting the battery cells may still remain connected, and the resulting arcing is likely to cause dangers such as fire and explosion. Moreover, the electrical connection of each battery cell enables the spread of thermal runaway between battery cells.

[0077] The inventors of the present application have found through research that a weak area can be provided on the electrical connection piece. When the battery device is subjected to an external force collision, the electrical connection piece will break at the weak area, quickly cutting off the electrical connection between the battery cells, thereby interrupting the current and preventing thermal runaway from spreading between the battery cells. Further, an insulating component can be provided near the weak area. When the weak area breaks, the insulating component will be punctured to cover the broken part, thereby quickly eliminating the arcing and playing an insulating role between the broken parts to prevent the broken electrical connection piece from reconnecting again.

[0078] Based on such a design concept, the inventors of the present application have designed a battery device, which includes a plurality of battery cells and an electrical connection component. The electrical connection component includes an electrical connection piece and an insulating component. The electrical connection piece is used to electrically connect two battery cells, and the electrical connection piece has a weak area. When the weak area breaks, the insulating component is punctured and covers the broken part of the electrical connection piece.

[0079] The embodiment of the present application also provides an electrical device that is powered by the above-mentioned battery device. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0080] In some embodiments, the electrical device can be a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The battery device is provided inside the vehicle, and the battery device can be provided at the bottom, head or tail of the vehicle. The battery device can be used for power supply of the vehicle. For example, the battery device can be used as the operating power source of the vehicle. The vehicle can also include a controller and a motor. The controller can be used to control the battery device to supply power to the motor. For example, the battery device can be used for the power consumption requirements during the start, navigation and driving of the vehicle.

[0081] For the convenience of description, the following embodiments will take a vehicle 1000, which is an electrical device of the embodiment of the present application, as an example for description.

[0082] Please refer to Figure 1 , Figure 1Schematic structural diagram of vehicle 1000 provided by some embodiments of the present application. Taking the electrical device as vehicle 1000 as an example, vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is disposed inside vehicle 1000, and the battery device 100 can be disposed at the bottom, head or tail of vehicle 1000. The battery device 100 can be used for power supply of vehicle 1000. For example, the battery device 100 can be used as the operating power source of vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of vehicle 1000.

[0083] In some embodiments, the battery device 100 can not only be used as the operating power source of vehicle 1000, but also be used as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0084] Please refer to Figure 2 , Figure 2 Schematic structural diagram of the battery device 100 provided by some embodiments of the present application. In some embodiments, the battery device 100 includes a box body 10 and a battery cell group, and the battery cell group is accommodated in the box body 10.

[0085] The box body 10 is used to provide an accommodation space for the battery cell group, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12. The first part 11 and the second part 12 are covered with each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cell group. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure. The first part 11 is covered on the open side of the second part 12 so that the first part 11 and the second part 12 jointly define an accommodation space; the first part 11 and the second part 12 can also both be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0086] In the battery device 100, there can be multiple battery cell groups, and the multiple battery cell groups can be connected in series, in parallel or in a mixed connection. The mixed connection means that there are both series and parallel connections among the multiple battery cell groups. The multiple battery cell groups can be directly connected in series, in parallel or in a mixed connection together, and then the whole formed by the multiple battery cell groups is accommodated in the box body 10.

[0087] The battery cell group includes a plurality of battery cells 20. The plurality of battery cells 20 are first connected in series, parallel, or in a combined series-parallel manner to form a battery cell group. Then, the plurality of battery cell groups are connected in series, parallel, or in a combined series-parallel manner to form an entirety and are accommodated in the box 10. The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing the electrical connection between the plurality of battery cells 20.

[0088] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of a battery cell provided in some embodiments of the present application. The battery cell 20 includes an end cap 21, a housing 22, a battery core 23, and other functional components.

[0089] The end cap 21 refers to a component that covers the opening of the housing 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 cooperate with the housing 22. Optionally, the end cap 21 may be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 21 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength. Functional components such as electrode terminals may be provided on the end cap 21. The electrode terminals may be used to electrically connect to the battery core 23 for outputting or inputting the electrical energy of the battery cell 20. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold may also be provided on the end cap 21. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special limitations on this. In some embodiments, an insulating member may be provided on the inner side of the end cap 21. The insulating member may be used to isolate the electrical connection pieces in the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0090] The housing 22 is a component for cooperating with the end cap 21 to form the internal environment of the battery cell 20. Among them, the formed internal environment can be used to accommodate the battery core 23, the electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 is covered at the opening to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the housing 22 can also be integrated. Specifically, the end cap 21 and the housing 22 can form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 22, the end cap 21 is then covered on the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the battery core 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0091] The battery core 23 is a component in the battery cell 20 where an electrochemical reaction occurs. The housing 22 can contain one or more battery cores 23. The battery core 23 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and generally, a separator is provided between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate with active substances constitute the main body of the battery core assembly, and the parts of the positive electrode plate and the negative electrode plate without active substances respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively. During the charging and discharging process of the battery, the positive active substance and the negative active substance react with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop.

[0092] Figure 4 It is a schematic structural diagram of the electrical connection component 30 provided in some embodiments of the present application; Figure 5 It is a schematic cross-sectional structural diagram of the electrical connection component 30 provided in some embodiments of the present application; Figure 6 is Figure 5 The enlarged structural diagram at position A in

[0093] Please refer to Figures 4 - 6 , the embodiments of the present application provide a battery device 100, including a box body 10, a plurality of battery cells 20, and an electrical connection component 30. The box body 10 is provided with an accommodation space, the plurality of battery cells 20 are arranged in the accommodation space, and the electrical connection component 30 is used for electrically connecting the battery cells 20. The electrical connection component 30 includes an electrical connection piece 31 and an insulation component 32. The electrical connection piece 31 is used for electrically connecting two battery cells 20, and the electrical connection piece 31 has a weak area 311. The insulation component 32 is arranged outside the weak area 311. When the weak area 311 breaks, the insulation component 32 is punctured and covers the broken part of the electrical connection piece 31.

[0094] By providing a weak area 311 on the electrical connection piece 31, when the battery device 100 is subjected to an external force collision, the electrical connection piece 31 will break at the weak area 311, quickly cutting off the electrical connection between the battery cells 20, thereby blocking the current and preventing thermal runaway from spreading between the battery cells 20. By providing an insulating component 32 outside the weak area 311, when the weak area 311 breaks, the insulating component 32 will be punctured to cover the broken part, thereby quickly eliminating arcing and playing an insulating role between the broken parts to prevent the broken electrical connection piece 31 from reconnecting again.

[0095] Exemplarily, the electrical connection piece 31 is made of a metal sheet such as a copper sheet or an aluminum sheet, and any two adjacent battery cells 20 in the battery device 100 are connected by the electrical connection piece 31.

[0096] In some embodiments, the insulating component 32 includes a housing 321 and a fluid insulating material. The housing 321 is wrapped outside the weak area 311; the fluid insulating material is disposed inside the housing 321, and the housing 321 can be punctured to release the fluid insulating material covering the broken part.

[0097] By providing the insulating component 32 to include a housing 321 and a fluid insulating material, under normal operating conditions, the fluid insulating material is stored inside the housing 321. When the weak area 311 breaks, the housing 321 is punctured, and the fluid insulating material is released from the housing 321 to cover the broken part, achieving a good insulating effect.

[0098] Exemplarily, the fluid insulating material can be an insulating glue such as insulating silicone rubber or polyurethane, which is in a liquid state when sealed in the housing 321 and can quickly solidify after being released from the housing 321 to fix the broken part, thereby achieving good insulation for the two broken surfaces where the electrical connection piece 31 is disconnected.

[0099] In some other embodiments, the insulating component 32 is provided to include a housing 321. The housing 321 is made of an insulating flexible material, such as silicone. When the broken part stabs into the housing 321, the relatively soft housing 321 will wrap around the broken part to achieve the purpose of insulation.

[0100] In some embodiments, as Figure 6 shown, along the thickness direction of the electrical connection piece 31, at least one side of the electrical connection piece 31 is provided with a groove 314, and the area of the electrical connection piece 31 provided with the groove 314 defines the weak area 311. By providing a groove 314 on at least one side in the thickness direction of the electrical connection piece 31, the thickness of the electrical connection piece 31 is reduced to weaken the structural strength of the electrical connection piece 31, achieving the function of the weak area 311.

[0101] In some other embodiments, a weak area 311 may also be formed on the electrical connection piece 31 by using a material with relatively low structural strength.

[0102] In the embodiments of the present application, grooves 314 are provided on both sides in the thickness direction of the electrical connection piece 31. Along the thickness direction of the electrical connection piece 31, the grooves 314 on both sides of the electrical connection piece 31 at least partially overlap in the thickness direction. In this way, a thinner weak area 311 can be formed at the overlapping position of the grooves 314 on both sides, which is more conducive to forming a fracture when an external force is applied.

[0103] In some embodiments, when the weak area 311 fractures, the housing 321 is configured to be punctured by the fractured part to release the fluid insulating material inside the housing 321.

[0104] Specifically, when the weak area 311 fractures, a relatively sharp fractured part will be formed. Due to the impact, the fractured part will move towards the housing 321 wrapped outside the weak area 311 and pierce it, so that the housing 321 can be pierced.

[0105] In some other embodiments, in order to more easily puncture the housing 321 when the weak area 311 fractures, a piercing part 312 is provided at the bottom of the groove 314. When the weak area 311 fractures, the housing 321 is configured to be punctured by the piercing part 312. By providing the piercing part 312 at the bottom of the groove 314, when the weak area 311 is bent under force, the piercing part 312 moves towards the housing 321 and punctures the housing 321.

[0106] Exemplarily, the piercing part 312 is set as a triangle with a sharp corner at the top to more easily puncture the housing 321. The piercing part 312 can specifically be an isosceles triangle or a non-isosceles triangle. The piercing part 312 can also be any other shape as long as it has a sharp corner facing the housing 321 and is easy to pierce the housing 321.

[0107] Optionally, the piercing part 312 and the bottom of the groove 314 are set as an integral structure to ensure the firm connection between the piercing part 312 and the bottom of the groove 314 and make the processing faster.

[0108] Optionally, the height of the piercing part 312 is not greater than the depth of the groove 314. With such a setting, in the normal state of the electrical connection assembly 30, the piercing part 312 sinks into the groove 314 and does not protrude beyond the surface of the electrical connection piece 31, keeping a distance between the piercing part 312 and the housing 321 and preventing damage to the housing 321, so as to avoid premature release of the fluid insulating material and resulting in solidification failure of the fluid insulating material.

[0109] In some embodiments, the height of the piercing portion 312 is set to H, and the wall thickness of the housing 321 is set to B; wherein, H = 0.8*B to 1.2*B. In this way, when the electrical connection piece 31 breaks, it can be ensured that the piercing portion 312 pierces the housing 321.

[0110] Specifically, the housing 321 is generally made of plastic material and will crack when impacted by the sharp corner of the piercing portion 312. Therefore, the housing 321 can crack and release the fluid insulating material without being completely pierced by the piercing portion 312. That is to say, the height H of the piercing portion 312 can be set to be less than the wall thickness B of the housing 321. By setting the piercing portion 312 to a smaller height, a larger spacing can be maintained between the piercing portion 312 and the housing 321 to further prevent the piercing portion 312 from accidentally piercing the housing 321.

[0111] In some embodiments, the groove 314 extends along the width direction of the electrical connection piece 31, and the piercing portion 312 and the groove wall of the groove 314 along the extending direction of the electrical connection piece 31 are spaced apart. Wherein, the width direction of the electrical connection piece 31 is Figure 5 the b direction shown in Figure 5 and the extending direction of the electrical connection piece 31 is

[0112] During the operation of the electrical connection assembly 30, it is mainly subjected to an impact force in the b direction and is prone to a fracture surface along the b direction. By setting the groove 314 to extend along the b direction, the groove 314 has a large coverage range in the b direction, so that it is easy to break quickly when impacted.

[0113] Optionally, the piercing portion 312 extends along the width direction of the electrical connection piece 31 to the edge of the electrical connection piece 31, so that the groove 314 penetrates the electrical connection piece 31 along the b direction, so as to be more easily completely broken when impacted.

[0114] Optionally, the groove wall of the groove 314 forms an angle with the thickness direction of the electrical connection piece 31; along the extending direction of the electrical connection piece 31, the piercing portion 312 is located in the middle of the groove 314, so that the thickness of the weak areas 311 on both sides of the piercing portion 312 is less than the thickness of the weak area 311 at the position of the piercing portion 312. In this way, the groove wall of the groove 314 is inclined, and the piercing portion 312 is arranged in the middle of the groove 314, so that weak areas 311 with reduced thickness are formed on both sides of the piercing portion 312, and the grooves 314 on both sides of the piercing portion 312 both have the effect of being easily broken, improving the fracture flexibility of the weak areas 311. When breaking from either side of the piercing portion 312, the piercing portion 312 can pierce the housing 321.

[0115] In some embodiments, the minimum thickness of the electrical connection piece 31 in the weak area 311 is T1, and the thickness of the area of the electrical connection piece 31 outside the weak area 311 is T2; wherein, T1 = 0.4*T2 to 0.8*T2. Herein, the area outside the weak area 311 refers to the area of the electrical connection piece 31 where no groove 314 is provided. When the thickness of the electrical connection piece 31 is uneven, the thickness T2 should be the thickness of the electrical connection piece 31 in the area adjacent to the groove 314. When the thickness of the electrical connection piece 31 is uniform, the thickness T2 can be any area where no groove 314 is provided.

[0116] Within this numerical range, it can ensure that the weak area 311 has sufficient structural strength under normal working conditions and will not break accidentally; at the same time, it can ensure that the weak area 311 breaks when subjected to an accidental impact, so as to quickly cut off the electrical connection between the two battery cells 20 and prevent the spread of thermal runaway.

[0117] In some embodiments, such as Figure 5 As shown, along the extending direction of the electrical connection piece 31, the electrical connection piece 31 is provided with at least two weak areas 311. In this way, the coverage range of the weak area 311 can be increased, thereby improving the reliability of the weak area 311 breaking when impacted. At the same time, the weak areas 311 are arranged at intervals along the extending direction of the electrical connection piece 31. On the one hand, it can ensure that different parts of the electrical connection piece 31 break when impacted, and on the other hand, it can also ensure the structural strength of the electrical connection piece 31.

[0118] In some embodiments, such as Figure 6 As shown, the housing 321 is configured with a receiving cavity 3212 for receiving a fluid insulating material, and the receiving cavity 3212 at least partially overlaps with the weak area 311 in the thickness direction of the electrical connection piece 31. In this way, it can ensure that the fluid insulating material in the receiving cavity 3212 can flow into the weak area 311 after being released to cover the fracture site.

[0119] Optionally, the receiving cavity 3212 at least partially overlaps with the piercing portion 312 in the thickness direction of the electrical connection piece 31, so that the piercing portion 312 can pierce the cavity wall of the receiving cavity 3212 to release the fluid insulating material.

[0120] Exemplarily, the projection of the receiving cavity 3212 on the electrical connection piece 31 covers the weak area 311 to ensure that the cavity wall of the receiving cavity 3212 can be pierced when the weak area 311 breaks from any position.

[0121] In some embodiments, such as Figure 5As shown in the figure, the electrical connection piece 31 has a first part, a second part, and a bent part 313 that is bent from the first part and the second part toward one side in the thickness direction. The weak area 311 is provided on the bent part 313. Among them, the first part and the second part are respectively connected to two battery cells 20, and the bent part 313 functions to connect the first part and the second part. By providing the bent part 313, it is convenient for the electrical connection assembly 30 to adapt to the installation space; by providing the weak area 311 on the bent part 313, the fracture function can be more easily exerted, so as to ensure the rapid cut-off of the electrical connection between the two battery cells 20.

[0122] Specifically, the insulation assembly 32 at least wraps the bent part 313, so that the insulation assembly 32 plays a better insulation role and prevents an external conductor from contacting the electrical connection piece 31 and causing a short circuit.

[0123] The battery device 100 provided by the embodiment of the present application includes a plurality of battery cells 20 and an electrical connection assembly 30. The electrical connection assembly 30 is used for electrically connecting the battery cells 20. The electrical connection assembly 30 includes an electrical connection piece 31 and an insulation assembly 32. The electrical connection piece 31 is used for electrically connecting two battery cells 20. Grooves 314 are provided on both sides of the electrical connection piece 31 in the thickness direction, and the groove 314 area forms a weak area 311. When the battery device 100 is impacted by an external force, the electrical connection piece 31 will break from the weak area 311, quickly cut off the electrical connection between the battery cells 20, thereby cutting off the current and preventing thermal runaway from spreading between the battery cells 20. The insulation assembly 32 includes a housing 321 and a fluid insulation material. The housing 321 wraps around the outside of the weak area 311. A receiving cavity 3212 for receiving the fluid insulation material is constructed inside the housing 321. A piercing portion 312 is provided at the bottom of the groove 314. When the weak area 311 breaks, the piercing portion 312 moves toward the housing 321 and pierces the receiving cavity 3212, releasing the fluid insulation material in the receiving cavity 3212, so that the fluid insulation material flows to the weak area 311 to cover the fracture site, thereby quickly eliminating arcing and playing an insulating role between the fracture sites at the same time. After the fluid insulation material solidifies, the two fracture surfaces are fixed and separated to prevent the broken electrical connection piece 31 from being connected again.

[0124] The embodiment of the present application also provides an electrical connection assembly 30. The electrical connection assembly 30 includes an electrical connection piece 31 and an insulation assembly 32. The electrical connection piece 31 has a weak area 311. The insulation assembly 32 is provided outside the weak area 311. When the weak area 311 breaks, the insulation assembly 32 is pierced and covers the fracture site of the electrical connection piece 31. The structure of the electrical connection assembly 30 is the same as that of the electrical connection assembly 30 in the above battery device 100, and will not be elaborated here.

[0125] It should be noted that the electrical connection component 30 provided in the embodiments of the present application is not limited to being applied in the battery device 100, nor is it limited to electrically connecting the battery cells 20, and it can be applied to any other device with electrical connection requirements.

[0126] The embodiments of the present application further provide an electrical device, including the battery device 100 provided in any of the above embodiments, and the battery device 100 is used to provide electrical energy.

[0127] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting 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: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, wherein the box body is provided with a containing space; A plurality of battery cells are arranged in the accommodation space; as well as Electrical connection assembly, comprising: An electrical connecting piece, used for electrically connecting the two battery cells, wherein the electrical connecting piece has a weak area; The insulating component is arranged outside the weak area. When the weak area is broken, the insulating component is punctured and covers the broken part of the electrical connecting piece.

2. The battery device according to claim 1, characterized in that: The insulation assembly comprises: A shell wrapped around the outside of the weak area; and The fluid insulating material is arranged inside the shell, and the shell can be punctured to release the fluid insulating material covering the ruptured part.

3. The battery device according to claim 2, characterized in that: Along the thickness direction of the electrical connection sheet, at least one side of the electrical connection sheet is provided with a groove, and the area on the electrical connection sheet where the groove is provided defines the weak area.

4. The battery device according to claim 3, characterized in that: Along the thickness direction of the electrical connection sheet, the grooves located on both sides of the electrical connection sheet at least partially overlap in the thickness direction.

5. The battery device according to claim 2, characterized in that: When the weak area is broken, the shell is configured to be pierced by the broken part.

6. The battery device according to claim 3, characterized in that: The groove bottom of the groove is provided with a piercing portion, and when the weak area is broken, the shell is configured to be pierced by the piercing portion.

7. The battery device according to claim 6, characterized in that: The height of the piercing portion is no greater than the depth of the groove.

8. The battery device according to claim 6, characterized in that: The height of the piercing portion is set to H, and the wall thickness of the shell is set to B; Among them, H=0.8*B~1.2*B.

9. The battery device according to claim 6, characterized in that: The groove extends along the width direction of the electrical connection sheet; The piercing portion is spaced apart from a groove wall of the groove along an extending direction of the electrical connecting sheet.

10. The battery device according to claim 9, characterized in that: An angle is formed between the groove wall of the groove and the thickness direction of the electrical connection sheet; Along the extension direction of the electrical connection sheet, the piercing portion is located in the middle of the groove, so that the thickness of the weak areas on both sides of the piercing portion is smaller than the thickness of the weak area at the position of the piercing portion.

11. The battery device according to claim 6, characterized in that: The piercing portion extends along a width direction of the electrical connection sheet to an edge of the electrical connection sheet.

12. The battery device according to claim 3, characterized in that: The minimum thickness of the electrical connection sheet in the weak area is T1, and the thickness of the electrical connection sheet in the area outside the weak area is T2; Among them, T1=0.4*T2~0.8*T2.

13. The battery device according to any one of claims 1 to 12, characterized in that: Along the extension direction of the electrical connection sheet, the electrical connection sheet is provided with at least two weak areas.

14. The battery device according to any one of claims 2 to 12, characterized in that: The housing is configured with a receiving cavity for receiving the fluid insulating material, and the receiving cavity at least partially overlaps with the weak area in a thickness direction of the electrical connection sheet.

15. The battery device according to any one of claims 1 to 12, characterized in that: The electrical connection sheet comprises a first portion, a second portion, and a bent portion bent toward one side along a thickness direction from the first portion and the second portion; The weak area is arranged on the bent portion.

16. The battery device according to claim 15, characterized in that: The insulating component at least wraps the bent portion.

17. An electrical connection assembly, characterized in that: The electrical connection assembly comprises: an electrical connection sheet having a weak area; and The insulating component is arranged outside the weak area. When the weak area is broken, the insulating component is punctured and covers the broken part of the electrical connecting piece.

18. An electrical equipment, characterized in that: Comprising a battery device as described in any one of claims 1 to 16, wherein the battery device is used to provide electrical energy.

Images