CN215989138U - Box body assembly, battery and power utilization device - Google Patents

Abstract

The embodiment of the application provides a box body assembly, a battery and an electric device. The box body assembly comprises a box body and a second conductive part, wherein the box body is used for accommodating a battery monomer and comprises a first conductive part; the electric conductor is arranged on the box body; the conductive part comprises a main body part and a second conductive part, the main body part and the second conductive part are integrally arranged, the main body part is connected with the first conductive part in an equipotential manner, and at least part of the second conductive part is connected with the conductive body in an equipotential manner; and a seal member interposed between the main body portion and the first conductive portion and hermetically connecting the main body portion and the first conductive portion. The embodiment of the application can improve the safety performance of the box body assembly, so that the safety performance of the battery is improved.

Description

Box body assembly, battery and power utilization device

Technical Field

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

Background

Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and the like.

In addition to improving the performance of batteries, safety issues are also a considerable problem in the development of battery technology. If the safety problem of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to enhance the safety of the battery is a technical problem to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The application provides a box body assembly, a battery and an electric device, which can enhance the safety of the battery.

In a first aspect, an embodiment of the present application provides a box assembly, including: the box body is used for accommodating the battery monomer and comprises a first conductive part; the electric conductor is arranged on the box body; the conductive part comprises a main body part and a second conductive part, the main body part and the second conductive part are integrally arranged, the main body part is connected with the first conductive part in an equipotential manner, and at least part of the second conductive part is connected with the conductive body in an equipotential manner; and a seal member interposed between the main body portion and the first conductive portion and hermetically connecting the main body portion and the first conductive portion.

In the above technical solution, the main body portion and the second conductive portion of the conductive member are integrally disposed, and there is substantially no resistance between the main body portion and the second conductive portion, and a potential difference is substantially not generated. The first conductive part is used as a conductive component of the box body, the first conductive part is connected with the main body part of the conductive part in an equipotential manner, and the first conductive part and the main body part are at the same potential, so that no current passes through the first conductive part and the main body part. At least part of the second conductive part is connected with the electric conductor in an equipotential manner, and the second conductive part is used for connecting the electric conductor with the first conductive part in an equipotential manner. And the sealing member centre gripping is between main part and first conductive part to sealing connection main part and first conductive part will show the sealing performance who improves the junction of main part and first conductive part, and then prevent that the junction of main part and first conductive part from taking place the corruption, thereby guarantee the equipotential connection between main part and the first conductive part, each department of first conductive part is the equipotential promptly, even human contact first conductive part of contact does not have the electric current production yet, avoid taking place the electric shock accident, thereby improve the security performance of battery.

In some embodiments, the second conductive portion protrudes from an outer surface of the main body portion and abuts against the conductive body. In the embodiment of the present application, the second conductive portion protrudes from the main body portion, and the second conductive portion is a protruding structure, which facilitates equipotential connection with the conductive body.

In some embodiments, the electrical conductor includes an insulating base disposed on the first conductive portion, an equipotential portion disposed on the insulating base and equipotentially connected to the second conductive portion, and a connecting portion protruding from the insulating base and electrically connected to the battery cell. In the embodiment of the present application, the equipotential portion of the electrical conductor and the second conductive portion are connected equipotentially, so that the equipotential portion and the first conductive portion are connected equipotentially. The connecting part of the conductor is electrically connected with the battery cell, and current is generated between the battery cell and the connecting part.

In some embodiments, the equipotential portion protrudes from the insulating base and abuts against the second conductive portion. In the embodiment of the present application, the equipotential portion is a protruding structure, and the protruding structure is favorable for the equipotential portion to contact with the second conductive portion, so that the reliability of equipotential connection between the equipotential portion and the second conductive portion can be ensured.

In some embodiments, a projection of the equipotential portion in the thickness direction of the conductive member is located within a projection of the second conductive portion in the thickness direction of the conductive member. In the embodiment of the present application, when the equipotential portion and the second conductive portion are mounted, mounting variation may be present, so that good contact between the equipotential portion and the second conductive portion is ensured, and reliability of equipotential connection between the equipotential portion and the second conductive portion is ensured.

In some embodiments, a projection of the second conductive portion in the thickness direction of the conductive member is located within a projection of the equipotential portion in the thickness direction of the conductive member. In the embodiment of the present application, when the equipotential portion and the second conductive portion are mounted, mounting variation may be present, so that good contact between the equipotential portion and the second conductive portion is ensured, and reliability of equipotential connection between the equipotential portion and the second conductive portion is ensured.

In some embodiments, a surface of the conductive member facing away from the sealing member is provided with a first protective layer. In the embodiment of the application, the first protection layer can further protect the conductive element, so that the conductive element is prevented from being corroded by external water and oxygen, and the reliability of equipotential connection between the conductive element and the first conductive part, and between the conductive element and the second conductive part can be improved.

In some embodiments, a surface of the first conductive portion facing away from the seal is provided with a second protective layer. In the embodiment of the application, the second protection layer can isolate the first conductive part from water and oxygen in the external environment, the water and the oxygen are difficult to chemically react with the first conductive part, the possibility of corrosion reaction of the first conductive part is reduced, and the second protection layer can effectively protect the first conductive part.

In some embodiments, the first conductive portion and the body portion are soldered. In the embodiment of the application, the bonding force between the first conductive part and the main body part is stronger, and the connection stability between the first conductive part and the main body part can be further improved.

In some embodiments, the first conductive portion and the body portion are connected by spot welding, and the sealing member comprises spot welding sealant. The welding mode of the embodiment of the application can improve the binding force between the first conductive part and the main body part, no gap exists between the first conductive part and the main body part, the sealing performance is good, the corrosion of the joint of the first conductive part and the main body part can be effectively prevented, and the equipotential connection between the first conductive part and the main body part is further ensured.

In some embodiments, the case includes a first case portion and a second case portion that cover each other, the first case portion including a first conductive portion and provided with a conductive member. In the embodiment of the present application, when the first box portion includes the first conductive portion having a conductive function, a conductive member is disposed on the first box portion, the conductive member will form an equipotential connection with the first conductive portion of the first box portion, and the first conductive portion will form an equipotential structure, so as to effectively protect the first box portion.

In some embodiments, the second housing portion includes the first conductive portion and is provided with a conductive member. In the embodiment of the present application, when the second box portion includes the first conductive portion having a conductive function, a conductive member is disposed on the second box portion, the conductive member will form an equipotential connection with the first conductive portion of the second box portion, and the first conductive portion will form an equipotential structure, so as to effectively protect the second box portion.

In some embodiments, the corrosion resistance of the first conductive portion is less than the corrosion resistance of the conductive member. In the embodiment of the application, the first conductive part and the conductive body form equipotential connection through the conductive part, so that the reliability of equipotential connection can be obviously improved.

In some embodiments, the conductive member is made of stainless steel or a galvanized aluminum magnesium plate. In the embodiment of the application, the conductive piece has good corrosion resistance, corrosion is not easy to occur, and equipotential connection between the first conductive part of the box body and the conductive piece can be ensured, so that the safety performance of the battery is improved.

In a second aspect, an embodiment of the present application provides a battery, which includes a battery cell and a case assembly as in any one of the embodiments of the first aspect, where the case assembly is used for accommodating the battery cell.

In a third aspect, an embodiment of the present application provides an electric device, including the battery of the second aspect, where the battery is used to provide electric energy.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

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

fig. 2 is an exploded schematic view of a battery provided by some embodiments of the present application;

fig. 3 is a schematic structural view of the battery module shown in fig. 2;

FIG. 4 is a schematic structural view of a case assembly provided by some embodiments of the present application;

FIG. 5 is a schematic diagram of an electrically conductive member of a housing assembly according to some embodiments of the present application;

FIG. 6 is a schematic diagram of the electrical conductors of the enclosure assembly provided in some embodiments of the present application.

In the drawings, the drawings are not necessarily drawn to scale.

Wherein, in the figures, the respective reference numerals:

1. a vehicle; 2. a battery; 3. a controller; 4. a motor; 5. a case assembly; 50. a box body; 51. a first tank portion; 52. a second tank portion; 55. an accommodating space; 6. a battery module; 7. a battery cell;

53. a first conductive portion; 54. a second protective layer;

8. an electrical conductor; 81. an insulating base; 82. equipotential portions; 83. a connecting portion;

9. a conductive member; 91. a main body portion; 92. a second conductive portion; 93. a first protective layer; 94. avoiding holes;

10. and a seal.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

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

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

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

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

The battery cell includes an electrode assembly and an electrolyte, the electrode assembly including a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive current collector comprises a positive current collecting part and a positive convex part protruding out of the positive current collecting part, the positive current collecting part is coated with a positive active material layer, at least part of the positive convex part is not coated with the positive active material layer, and the positive convex part is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative current collecting part and a negative convex part protruding out of the negative current collecting part, the negative current collecting part is coated with a negative active material layer, at least part of the negative convex part is not coated with the negative active material layer, and the negative convex part is used as a negative electrode tab. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the spacer may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The battery cell may further include a housing assembly having a receiving cavity therein, the receiving cavity being a closed space provided by the housing assembly for the electrode assembly and the electrolyte. The shell assembly comprises a shell and an end cover assembly, wherein the shell is of a hollow structure with one side opened, and the end cover assembly covers the opening of the shell and is in sealing connection with the opening of the shell to form a containing cavity for containing the electrode assembly and the electrolyte.

In the development of battery technology, various design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters, need to be considered, and in addition, safety performance needs to be considered.

The battery cell can generate a high voltage, and in order to prevent the current generated from the battery cell from flowing through the case, the battery cell and the case are generally insulated from each other. However, in the process of transporting or using the battery, the insulation between the battery cell and the box body may fail due to faults, in order to avoid the current passing through the box body, the conductive members on the box body are connected to the same potential through the equipotential connection, and after the equipotential connection, even if the conductive members are contacted, the risk of electric shock is not caused.

The inventor finds that if corrosion occurs at the equipotential connection part, corrosive substances such as rust stains are generated, the resistance of the corrosive substances is far greater than that of the conductive component, namely, the resistance of the equipotential connection part is increased due to the corrosive substances, so that the equipotential connection is failed, electric shock risks are caused, and the potential safety hazard of the battery is increased.

In view of this, the inventor proposes a solution in which a case assembly of a battery includes: the box body is used for accommodating the single battery and is insulated from the single battery, and the box body comprises a first conductive part; the electric conductor is arranged on the box body; the conductive part comprises a main body part and a second conductive part, the main body part and the second conductive part are integrally arranged, the main body part is connected with the first conductive part in an equipotential manner, and at least part of the second conductive part is connected with the conductive body in an equipotential manner; and a seal member interposed between the main body portion and the first conductive portion and hermetically connecting the main body portion and the first conductive portion. The box body assembly with the structure can form the first conductive part of the box body assembly into an equipotential structure, and no current is generated even if a human body contacts the first conductive part, so that electric shock accidents are avoided, and the safety of the battery is improved.

The technical scheme described in the embodiment of the application is suitable for the battery containing the battery cells and the electric device using the battery.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above power utilization device.

For convenience of explanation, the following embodiments will be described with an electric device as an example of a vehicle.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application. As shown in fig. 1, a battery 2 is provided inside a vehicle 1, and the battery 2 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, and for example, the battery 2 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being adapted to control the battery 2 to power the motor 4, e.g. for start-up, navigation and operational power demands while driving of the vehicle 1.

In some embodiments of the present application, the battery 2 may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.

Fig. 2 is an exploded schematic view of a battery provided in some embodiments of the present application. As shown in fig. 2, the battery 2 includes a case assembly 5 and battery cells (not shown in fig. 2) accommodated in the case assembly 5.

The case assembly 5 is used for accommodating the battery cells, and the case assembly 5 may have various structures. In some embodiments, the case assembly 5 may include a case body including a first case portion 51 and a second case portion 52, the first case portion 51 and the second case portion 52 cover each other, and the first case portion 51 and the second case portion 52 together define a receiving space 55 for receiving the battery cell. The second casing part 52 may be a hollow structure with one open end, the first casing part 51 is a plate-shaped structure, and the first casing part 51 covers the open side of the second casing part 52 to form the casing assembly 5 with the accommodating space 55; the first casing portion 51 and the second casing portion 52 may be hollow structures with one side opened, and the open side of the first casing portion 51 covers the open side of the second casing portion 52 to form the casing assembly 5 having the accommodating space 55. Of course, the first and second casing portions 51 and 52 may be various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In order to improve the sealing property after the first casing portion 51 and the second casing portion 52 are connected, a sealing structure, such as a sealant or a gasket, may be provided between the first casing portion 51 and the second casing portion 52.

Assuming that the first box portion 51 covers the top of the second box portion 52, the first box portion 51 may also be referred to as an upper box cover, and the second box portion 52 may also be referred to as a lower box body.

In the battery 2, one or more battery cells may be provided. If the number of the battery monomers is multiple, the multiple battery monomers can be connected in series or in parallel or in series-parallel, and the series-parallel refers to that the multiple battery monomers are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers is accommodated in the box body component 5; of course, a plurality of battery cells may be connected in series, in parallel, or in series-parallel to form the battery module 6, and a plurality of battery modules 6 may be connected in series, in parallel, or in series-parallel to form a whole and accommodated in the case assembly 5.

Fig. 3 is a schematic structural view of the battery module shown in fig. 2. As shown in fig. 3, in some embodiments, there are a plurality of battery cells 7, and the plurality of battery cells 7 are connected in series or in parallel or in series-parallel to form the battery module 6. The plurality of battery modules 6 are connected in series or in parallel or in series-parallel to form a whole and are accommodated in the case.

The plurality of battery cells 7 in the battery module 6 may be electrically connected to each other by a bus member, so as to realize parallel connection, series connection, or parallel-series connection of the plurality of battery cells 7 in the battery module 6.

Fig. 4 is a schematic structural diagram of a box assembly provided in some embodiments of the present application, and fig. 5 is a schematic structural diagram of a conductive member of the box assembly provided in some embodiments of the present application. As shown in fig. 4 and 5, in some embodiments, the case assembly 5 includes: and a case 50 for accommodating the battery cells. The case 50 includes a first conductive portion 53; the conductor 8, the conductor 8 is set up in the container 50; a conductive member 9, the conductive member 9 including a main body 91 and a second conductive portion 92, the main body 91 and the second conductive portion 92 being integrally provided, the main body 91 being equipotentially connected to the first conductive portion 53, and at least a part of the second conductive portion 92 being equipotentially connected to the conductive member 8; and a seal member 10 that is sandwiched between the main body portion 91 and the first conductive portion 53, and that seals and connects the main body portion 91 and the first conductive portion 53.

The battery cell comprises an electrode assembly and a shell assembly, wherein the shell assembly is used for accommodating the electrode assembly, and the electrode assembly is a core part of the charging and discharging functions of the battery cell and can lead out current.

The case 50 includes a first case portion and a second case portion that together define a receiving space that receives the battery cell. The first and/or second casing portions may be made of a conductive material, such as a metal material. When the first case portion and/or the second case portion are made of a conductive material, in order to prevent current from being generated between the case 50 and the battery cell, an insulating material may be coated on the surface of the first case portion and/or the second case portion to insulate the case 50 from the battery cell. Of course, the first casing portion and the second casing portion may be made of a material having insulating properties.

The first conductive part 53 is a conductive member of the case 50, and the first conductive part 53 may include a metal connection member on the case 50, or a conductive first case part, or a conductive second case part, for example.

In the embodiment of the present application, the conductive member 8 and the conductive member 9 are provided, and the first conductive portion 53 of the box 50 is formed into an equipotential structure, so that no potential difference is generated, and the occurrence of an electric shock accident is avoided.

The electric conductor 8 is a device capable of connecting the case 50 and the electric conductor 8 themselves to an equipotential structure, and the electric conductor 8 may be a metal member, for example, the metal member and the first conductive part 53 of the case 50 form an equipotential; alternatively, the conductor 8 may be an equipotential connector, and the equipotential connector may be equipotential with respect to the first conductive portion 53 of the case 50, and the equipotential connector may be electrically connected to the battery cell.

The conductive member 9 is a member capable of connecting the tank and the conductive member 9 to have an equipotential structure, and the conductive member 9 is a metal member, for example. The conductive element 9 may be installed inside the box 50, or may be installed outside the box 50, or may be embedded in the box 50, and the installation position of the conductive element 9 may be flexibly adjusted according to actual production needs, and the installation position of the conductive element 9 is not limited herein.

The sealing member 10 seals the conductive member 9 and the first conductive portion 53, and can prevent corrosion at the connection between the conductive member 9 and the first conductive portion 53.

If corrosion occurs at the connection between the conductive member and the first conductive portion, corrosive substances such as rust may be generated, and the resistance of the rust is much greater than that of the first conductive portion, i.e., the first conductive portion itself may generate a potential difference. If the first conductive part is electrically connected with the single battery, the current generated by the single battery flows through the first conductive part, and the first conductive part cannot form an equipotential, so that the risk of electric shock is caused, and the potential safety hazard of the battery is increased.

In the embodiment of the present application, the main body 91 of the conductive member 9 and the second conductive portion 92 are integrally provided, and there is substantially no resistance between the main body 91 and the second conductive portion 92, and substantially no potential difference is generated. The first conductive part 53 is used as a conductive member of the case, the first conductive part 53 is connected to the main body part 91 of the conductive part 9 at the same potential, and the first conductive part 53 and the main body part 91 are brought to the same potential, so that no current flows between the first conductive part 53 and the main body part 91. At least a part of the second conductive portion 92 is equipotentially connected to the conductor 8, and the second conductive portion 92 is equipotentially connected to the conductor 8 and the first conductive portion 53. Furthermore, the sealing member 10 is clamped between the main body 91 and the first conductive part 53 and hermetically connects the main body 91 and the first conductive part 53, so that the sealing performance of the connection between the main body 91 and the first conductive part 53 is remarkably improved, and further, the connection between the main body 91 and the first conductive part 53 is prevented from being corroded, so that the equipotential connection between the main body 91 and the first conductive part 53 is ensured, namely, all parts of the first conductive part 53 are equipotential, no current is generated even if a human body contacts the first conductive part 53, an electric shock accident is avoided, and the safety performance of the battery is improved.

In the embodiment of the present application, the box 50 can hold the single battery and can protect the single battery.

Referring to fig. 4 and fig. 5, in some embodiments, the first conductive portion 53 and the main body portion 91 may be soldered, and the bonding force between the first conductive portion 53 and the main body portion 91 is stronger, so as to improve the connection stability between the first conductive portion 53 and the main body portion 91.

In order to improve the sealing between the main portion 91 and the first conductive portion 53 of the conductive member 9, in some embodiments, the first conductive portion 53 and the main portion 91 are connected by spot welding, and the sealing member 10 comprises spot welding sealant. The spot welding sealant is electrically conductive, and is bonded to the main body portion 91, and the first conductive portion 53 and the main body portion 91 can be welded by spot welding. In the welding mode, the bonding force between the first conductive part 53 and the main body part 91 is strong, a gap is basically not formed between the first conductive part 53 and the main body part 91, the sealing performance is good, the corrosion of the joint of the first conductive part 53 and the main body part 91 can be effectively prevented, and the equipotential connection between the first conductive part 53 and the main body part 91 is further ensured. It is understood that the spot welding points may be uniformly distributed on the spot welding sealant, thereby further improving the connection stability between the first conductive portion 53 and the main body portion 91.

In other embodiments, the first conductive portion 53 and the main body portion 91 are welded together, and the sealing member 10 includes a sealing gasket, such as a rubber sealing gasket, a teflon sealing gasket, or the like. The gasket is located between the first conductive portion 53 and the main body portion 91, and a through hole is formed in the gasket for soldering the first conductive portion 53 and the main body portion 91. In order to further reduce the occupied space of the gasket, at least a portion of the gasket may be embedded in the first conductive portion 53, thereby improving the occupied space of the gasket and improving the space utilization.

In some embodiments, the first box portion comprises a first conductive portion 53, the conductor 9 being disposed in the first box portion; and/or the second housing part comprises a first conductive part 53, and the conductive member 9 is arranged on the second housing part. When the first box body part comprises the first conductive part 53 with the conductive function, the conductive part 9 is arranged on the first box body part, the conductive part 9 forms equipotential connection with the first conductive part 53 of the first box body part, and the first conductive part 53 forms an equipotential structure, so that the first box body part is effectively protected. When the second box body part comprises the first conductive part 53 with the conductive function, the conductive part 9 is arranged on the second box body part, the conductive part 9 forms equipotential connection with the first conductive part 53 of the second box body part, and the first conductive part 53 forms an equipotential structure, so that the second box body part is effectively protected.

With continued reference to fig. 4 and 5, to improve the corrosion resistance of the case, and in particular the corrosion resistance of the first conductive portion 53 of the case 50, in some embodiments, the surface of the first conductive portion 53 of the case 50 facing away from the seal 10 is provided with a second protective layer 54. The second protective layer 54 can isolate the first conductive part 53 from water and oxygen in the external environment, the water and the oxygen are difficult to chemically react with the first conductive part 53, the possibility of corrosion reaction of the first conductive part 53 is reduced, and the second protective layer 54 can effectively protect the first conductive part 53.

In order to further improve the corrosion resistance of the tank, a second protective layer 54 may be disposed on the surface of the tank 50, so as to protect the entire tank 50 and prevent the tank 50 from corrosion reaction.

With continued reference to fig. 4 and 5, in the embodiment of the present application, the conductive member 9 mainly functions to form an equipotential connection with the first conductive portion 53 of the box.

In some embodiments, the corrosion resistance of first conductive portion 53 is less than the corrosion resistance of conductive element 9, and the reliability of the equipotential connection can be significantly improved by forming equipotential connection between first conductive portion 53 and conductive element 8 through conductive element 9.

In some embodiments, the conductive member 9 may be made of a material having corrosion resistance, and exemplarily, the conductive member 9 may be made of stainless steel such as 302 stainless steel, 304 stainless steel, 309 stainless steel, or a zinc-aluminum-magnesium plated plate. The conductive piece 9 has good corrosion resistance, corrosion is not easy to occur, and equipotential connection between the box body 50 and the conductive piece 9 can be ensured, so that the safety performance of the battery is improved.

To further improve the corrosion resistance of the conductive member 9, in some embodiments, the surface of the conductive member 9 facing away from the sealing member 10 is provided with a first protective layer 93. The first protective layer 93 can further protect the conductive member 9, prevent the conductive member 9 from being corroded by external water and oxygen, and improve the reliability of equipotential connection between the first conductive portion 53 and the second conductive portion 92.

In order to ensure the reliability of the equipotential connection, in some embodiments, the second conductive portion 92 of the conductive member 9 protrudes from the outer surface of the main body 91 and abuts against the conductive body 8. The second conductive portion 92 protrudes from the main body portion 91, and the second conductive portion 92 has a protruding structure, which facilitates equipotential connection with the electrical conductor 8. In the present embodiment, the outer surface of the body 91 refers to the surface of the body 91 facing the conductor 8.

In other embodiments, the second conductive portion 92 may also be a flat plate structure, and the flat plate structure is connected to the conductive body 8. The flat plate structure can effectively relieve the stress concentration problem of the conductive piece 9 and prolong the service life of the conductive piece 9; and the occupied space of the flat plate structure is less, so that the occupied space of the battery can be obviously reduced, and the space utilization rate is improved.

FIG. 6 is a schematic diagram of the electrical conductors of the enclosure assembly provided in some embodiments of the present application.

As shown in fig. 4 to 6, in the present embodiment, the conductive body 8 can be equipotentially connected to the conductive member 9, thereby equipotentially connecting the conductive body 8 to the first conductive portion 53.

In some embodiments, the electrical conductor 8 includes an insulating base 81 provided on the first conductive portion 53, an equipotential portion 82 provided on the insulating base 81 and equipotentially connected to the second conductive portion 92, and a connection portion 83 protruding from the insulating base 81 and electrically connected to the battery cell. The insulating base 81 is disposed on the first conductive part 53 and is connected to the first conductive part 53 in an insulating manner; the equipotential portion 82 of the conductor 8 is equipotentially connected to the second conductive portion 92, so that the equipotential portion 82 is equipotentially connected to the first conductive portion 53. The connection portion 83 of the conductor 8 is electrically connected to the battery cell, and current is generated between the battery cell and the connection portion 83.

Optionally, the conductive member 9 is provided with a relief hole 94, and the connection portion 83 penetrates through the relief hole 94 and extends into the box body to be electrically connected with the battery cell. The conductive member 9 has the escape hole 94, and the conductive member 9 does not interfere with the electrical connection of the connection part 83 and the battery cell.

In order to improve the reliability of the equipotential connection, in some embodiments, the equipotential portion 82 protrudes from the insulating base 81 and abuts against the second conductive portion 92. The convex structure facilitates the contact between the equipotential portion 82 and the second conductive portion 92, so that the reliability of the equipotential connection between the equipotential portion 82 and the second conductive portion 92 can be ensured. The equipotential portion 82 has a convex structure, and accordingly, the second conductive portion 92 can have a flat structure, which can ensure the reliability of equipotential connection; alternatively, the second conductive portion 92 may have a convex structure to facilitate the mounting of the equipotential portion 82 and the second conductive portion 92.

In some embodiments, the projection of equipotential portion 82 in the thickness direction of conductive member 9 is located within the projection of second conductive portion 92 in the thickness direction of conductive member 9. In the present embodiment, the cross-sectional area of the second conductive portion 92 in the direction perpendicular to the thickness direction is larger than the cross-sectional area of the equipotential portion 82 in the direction perpendicular to the thickness direction. Since the cross-sectional area of the second conductive portion 92 is relatively larger, the equipotential portion 82 may be located at the center of the second conductive portion 92 or may be located away from the center of the second conductive portion 92, and connection between the equipotential portion 82 and the second conductive portion 92 can be secured regardless of the arrangement. Therefore, when the equipotential portion 82 and the second conductive portion 92 are mounted, mounting variation can be caused, and thus, good contact between the equipotential portion 82 and the second conductive portion 92 can be ensured, and reliability of equipotential connection between the equipotential portion 82 and the second conductive portion 92 can be ensured.

In other embodiments, the projection of the second conductive portion 92 in the thickness direction of the conductive member 9 is located within the projection of the equipotential portion 82 in the thickness direction of the conductive member 9. In the present embodiment, the cross-sectional area of the second conductive portion 92 in the direction perpendicular to the thickness direction is smaller than the cross-sectional area of the equipotential portion 82 in the direction perpendicular to the thickness direction. Since the cross-sectional area of the equipotential portion 82 is relatively larger, the second conductive portion 92 may be located at the center of the equipotential portion 82 or may be located away from the center of the equipotential portion 82, and connection between the equipotential portion 82 and the second conductive portion 92 is ensured regardless of the arrangement. Therefore, when the equipotential portion 82 and the second conductive portion 92 are mounted, mounting variation can be caused, and thus, good contact between the equipotential portion 82 and the second conductive portion 92 can be ensured, and reliability of equipotential connection between the equipotential portion 82 and the second conductive portion 92 can be ensured.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (14)

1. A case assembly, comprising:

the battery pack comprises a box body, a first conductive part and a second conductive part, wherein the box body is used for accommodating a battery monomer;

a conductor provided in the case;

a conductive member including a main body portion and a second conductive portion, the main body portion and the second conductive portion being integrally disposed, the main body portion being equipotentially connected to the first conductive portion, at least a portion of the second conductive portion being equipotentially connected to the conductive member; and

and a seal member interposed between the main body portion and the first conductive portion and hermetically connecting the main body portion and the first conductive portion.

2. The cabinet assembly as claimed in claim 1,

the second conductive part protrudes from the outer surface of the main body part and abuts against the conductive body.

3. The cabinet assembly as claimed in claim 2,

the conductor includes an insulating base provided on the first conductive portion, an equipotential portion provided on the insulating base and equipotentially connected to the second conductive portion, and a connecting portion protruding from the insulating base and electrically connected to the battery cell.

4. A cabinet assembly as claimed in claim 3,

the equipotential portions protrude from the insulating base and abut against the second conductive portion.

5. A cabinet assembly as claimed in claim 3,

the projection of the equipotential portion in the thickness direction of the conductive member is located within the projection of the second conductive portion in the thickness direction of the conductive member; or

The projection of the second conductive part in the thickness direction of the conductive member is located within the projection of the equipotential part in the thickness direction of the conductive member.

6. The cabinet assembly as claimed in claim 1,

the surface of the conductive piece, which faces away from the sealing piece, is provided with a first protective layer.

7. A housing assembly according to claim 1, wherein a surface of the first conductive portion facing away from the seal is provided with a second protective layer.

8. The cabinet assembly as claimed in claim 1,

the first conductive portion and the main body portion are soldered to each other.

9. A housing assembly in accordance with claim 8 wherein said first conductive portion is connected to said main body portion by spot welds and said seal comprises spot weld sealant.

10. A cabinet assembly as claimed in claim 1, wherein the cabinet includes first and second cabinet portions which cover each other, the first cabinet portion including the first conductive portion and being provided with the conductive member; and/or the second box body part comprises the first conductive part and is provided with the conductive part.

11. A tank assembly as claimed in claim 1, in which the corrosion resistance of the first conductive part is less than the corrosion resistance of the conductive part.

12. A cabinet assembly as claimed in claim 11, wherein the conductive member is made of stainless steel or a galvanized aluminum-magnesium plate.

13. A battery, comprising:

a battery cell; and

a housing assembly as claimed in any one of claims 1 to 12 for housing a battery cell.

14. An electrical device comprising a battery as claimed in claim 13 for providing electrical energy.

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