Battery cell, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, a shell in the battery monomer comprises a shell body and a cover body, the shell body forms a containing cavity with an opening, an electrode assembly is arranged in the containing cavity, and the cover body is connected to the shell body to block the opening; part of the first insulating part covers the surface, deviating from the accommodating cavity, of the shell, and the other part of the first insulating part covers the surface, deviating from the accommodating cavity, of the cover body; the second insulating part sleeves the periphery of the shell and is stacked with the first insulating part; the end face of the second insulating part is flush with or protrudes out of the end face of the shell along the direction of the opening. The second insulating part is sleeved on the periphery of the shell and is stacked with the first insulating part, and the end surface of the second insulating part is flush with or protrudes out of the end surface of the shell along the opening direction, so that after the first insulating part is punctured by the shell, the second insulating part can still insulate and isolate the shell from an external device; the battery monomer can be well insulated from an external device, and has good reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery monomer, a battery and a power utilization device. BACKGROUND

[0002] Battery device has the advantages of high specific energy and high power density, and is widely used in electronic equipment and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools.

[0003] With the continuous expansion of the application range of battery device, people's requirements for the reliability of the battery are also getting higher and higher. How to improve the reliability of the battery is more and more concerned by the technical personnel in the field. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a battery monomer, a battery and a power utilization device, which can realize good insulation with external devices and has good reliability.

[0005] In the first aspect, the present application provides a battery monomer, which comprises an electrode assembly, a shell, a first insulating piece and a second insulating piece. The shell comprises a shell body and a cover body. The shell body forms a cavity with an opening. The electrode assembly is arranged in the cavity. The cover body is connected to the shell body to block the opening. Part of the first insulating piece covers the surface of the shell body away from the cavity. Another part of the first insulating piece covers the surface of the cover body away from the cavity. The second insulating piece is sleeved on the outer periphery of the shell body and is arranged in layers with the first insulating piece. The end surface of the second insulating piece is flush with or protrudes from the end surface of the shell in the opening direction.

[0006] In the above structure, since the second insulating piece is sleeved on the outer periphery of the shell body and is arranged in layers with the first insulating piece, and the end surface of the second insulating piece is flush with or protrudes from the end surface of the shell in the opening direction, after the first insulating piece is pierced by the shell, the second insulating piece can still insulate and isolate the shell from external devices, so that the battery monomer can realize good insulation with external devices and has good reliability.

[0007] According to the battery monomer provided by some embodiments of the present application, the shell protrudes from the surface of the cover body away from the cavity in the opening direction. The end surface of the second insulating piece in the opening direction is flush with or protrudes from the end surface of the shell in the opening direction.

[0008] Since the shell protrudes from the surface of the cover body away from the cavity in the opening direction, the end surface of the shell in the opening direction is the end surface of the shell in the opening direction. By making the end surface of the second insulating piece in the opening direction flush with or protrude from the end surface of the shell in the opening direction, the end surface of the second insulating piece in the opening direction can be flush with the end surface of the shell in the opening direction, or protrude from the end surface of the shell in the opening direction.

[0009] According to the battery cell provided by some embodiments of the present application, the cover is connected to the shell on the outer side of the opening direction, and the end surface of the second insulating member is flush with or protrudes from the end surface of the cover along the opening direction.

[0010] Since the cover is connected to the shell on the outer side of the opening direction, the end surface of the shell on the opening direction is the end surface of the cover on the opening direction. By making the end surface of the second insulating member flush with or protrude from the end surface of the cover, the end surface of the second insulating member on the opening direction can be flush with the end surface of the shell on the opening direction, or protrude from the end surface of the shell on the opening direction.

[0011] According to the battery cell provided by some embodiments of the present application, the thickness of the second insulating member is set as H, and 0.03mm≤H≤1.5mm. This not only makes the second insulating member have sufficient structural strength and not prone to breakage or damage, but also makes the second insulating member not prone to waste materials and space of the battery device due to excessive thickness.

[0012] According to the battery cell provided by some embodiments of the present application, 0.05mm≤H≤1mm.

[0013] According to the battery cell provided by some embodiments of the present application, along the opening direction, the size of the second insulating member is G1, and the size of the shell is G2, and 0.01%≤G1 / G2≤15%. This not only makes the second insulating member have sufficient size to insulate and isolate the corner on the end surface of the shell on the opening direction, but also makes the second insulating member not redundant in size on the opening direction, which is conducive to reducing the cost of the second insulating member.

[0014] According to the battery cell provided by some embodiments of the present application, 0.01%≤G1 / G2≤10%.

[0015] According to the battery cell provided by some embodiments of the present application, the second insulating member is of a rubber structure or a plastic structure, so that the second insulating member has good insulation.

[0016] According to the battery cell provided by some embodiments of the present application, the shell is of a steel structure. By setting the steel shell, a person skilled in the art can increase the available space inside the battery cell by thinning the thickness of the shell, so as to greatly improve the energy density of the battery cell.

[0017] According to the battery cell provided by some embodiments of the present application, the shell includes a bottom wall and a side wall connected to the outer periphery of the bottom wall, and the bottom wall and the opening are oppositely arranged; the battery cell further includes a third insulating member covering one side of the bottom wall away from the cavity. This not only reduces the possibility of damage to the bottom wall due to external impact, but also enables the third insulating member to play a buffering role between the bottom wall and the bearing member of the battery cell, thereby reducing the impact on the bottom wall.

[0018] According to the battery cell provided by some embodiments of the present application, the third insulation member comprises a bottom pad part and a surrounding part connected to the outer periphery of the bottom pad part, the bottom pad part covers the side of the bottom wall away from the cavity, and the surrounding part is sleeved on the outer periphery of the side wall, so that the bottom pad part and the surrounding part can protect the connection (corner) between the bottom wall and the side wall.

[0019] According to the battery cell provided by some embodiments of the present application, the outer surface of the second insulation member and / or the outer surface of the third insulation member is provided with a friction structure.

[0020] According to the battery cell provided by some embodiments of the present application, the friction structure comprises a protrusion protruding from the outer surface of the second insulation member and / or the outer surface of the third insulation member.

[0021] In a second aspect, the present application provides a battery device, which comprises a box body and the battery cell provided by any of the above technical solutions.

[0022] According to the battery device provided by some embodiments of the present application, a plurality of battery cells are provided, the openings of the plurality of battery cells are arranged in the same direction, and the plurality of battery cells are arranged along a first direction to form a battery cell assembly, the first direction is perpendicular to the direction in which the openings of the battery cells face; the battery device further comprises a fourth insulation member, which covers the outer side of the shell away from the openings in the battery cell assembly.

[0023] According to the battery device provided by some embodiments of the present application, the battery device further comprises a buffer member, which is clamped between two adjacent battery cells, and along the first direction, the thickness of the second insulation member is equal to or less than half the thickness of the buffer member.

[0024] According to the battery device provided by some embodiments of the present application, the fourth insulation member comprises a bottom part and a surrounding part connected to the outer periphery of the bottom part, the bottom part covers the outer side of the shell away from the openings in the battery cell assembly, and the surrounding part is sleeved on the outer periphery of the battery cell assembly.

[0025] According to the battery device provided by some embodiments of the present application, the fourth insulation member further comprises a separation part connected to the surrounding part and the bottom part, and the separation part is located between two adjacent battery cells.

[0026] In a third aspect, the present application provides a power consumption device, which comprises the battery device provided by any of the above technical solutions, and the battery is used to provide electric energy.

[0027] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0028] The application provides a battery monomer, which comprises an electrode assembly, a shell, a first insulating piece and a second insulating piece, the shell comprises a shell body and a cover body, the shell body forms a cavity with an opening, the electrode assembly is arranged in the cavity, and the cover body is connected to the shell body to block the opening; part of the first insulating piece covers a surface of the shell body away from the cavity, and another part of the first insulating piece covers a surface of the cover body away from the cavity; the second insulating piece is sleeved on the outer periphery of the shell body and is arranged in a stack with the first insulating piece; in the opening direction, the end surface of the second insulating piece is flush with or protrudes from the end surface of the shell. In the above structure, since the second insulating piece is sleeved on the outer periphery of the shell body and is arranged in a stack with the first insulating piece, and in the opening direction, the end surface of the second insulating piece is flush with or protrudes from the end surface of the shell, after the first insulating piece is punctured by the shell, the second insulating piece can still insulate and isolate the shell from external devices, so that the battery monomer can be well insulated from external devices, and good reliability is achieved.

[0029] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several drawings to represent similar parts.

[0031] Figure 1 Structure schematic view of a vehicle provided by some embodiments of the application;

[0032] Figure 2 Split view of a battery device provided by some embodiments of the application;

[0033] Figure 3 Split view of a battery monomer provided by some embodiments of the application;

[0034] Figure 4 Partial internal structure schematic view of a battery monomer provided by some embodiments of the application;

[0035] Figure 5 Partial internal structure schematic view of a battery monomer provided by some embodiments of the application;

[0036] Figure 6 Structure schematic view of a battery monomer assembly provided by some embodiments of the application;

[0037] Figure 7A partial internal structure diagram of a battery cell assembly provided by some embodiments of the present application;

[0038] Figure 8 A structure diagram of a fourth insulating member provided by some embodiments of the present application.

[0039] In the drawings:

[0040] 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, case; 5a, first case portion; 5b, second case portion; 5c, accommodation space; 7, battery cell; 8, electrode assembly; 9, housing; 91, housing; 911, bottom wall; 912, side wall; 92, cover; 10, cavity; 101, opening; 11, first insulating member; 12, second insulating member; 13, third insulating member; 131, bottom pad portion; 134, surrounding portion; 14, fourth insulating member; 141, bottom portion; 142, surrounding portion; 143, partition portion; 15, buffer member; X, first direction. DETAILED DESCRIPTION

[0041] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0042] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0043] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0044] In addition, the technical terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "multiple" is two or more (including two), unless otherwise specifically limited.

[0045] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0047] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields.

[0048] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cell assemblies to provide higher voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0049] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0050] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging the active material for continued use.

[0051] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead-acid battery cell, etc.

[0052] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive electrode and the negative electrode from shorting while allowing the active ions to pass through.

[0053] The electrode assembly can have a jelly-roll structure, a stack structure, or a hybrid structure of the jelly-roll structure and the stack structure.

[0054] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell having another shape. The prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, and the like.

[0055] In some embodiments, the battery device can be a battery module. When a plurality of battery cells are arranged and fixed to form a battery module.

[0056] In some embodiments, the battery device can be a battery pack. The battery pack includes a box and battery cells or battery modules accommodated in the box.

[0057] In some embodiments, the box can be a part of a chassis structure of a vehicle. For example, a part of the box can be at least a part of a floor of the vehicle, or a part of the box can be at least a part of a cross beam and a longitudinal beam of the vehicle.

[0058] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0059] In order to meet the requirements of output voltage, capacity, and the like, a large number of battery cells are generally arranged in the battery device. In order to fully utilize the internal space of the battery device, the battery cells are generally arranged in close proximity to each other. This increases the risk of overlapping of the housings of the adjacent battery cells, and short circuit between the adjacent battery cells.

[0060] At present, in order to reduce the risk of short circuit between the adjacent battery cells, an insulating film is generally wrapped on the housing of the battery cell. However, due to the high hardness of the housing, the housing is relatively sharp at the corner. When the battery cell is subjected to extrusion or impact, especially when the battery cell is subjected to a large expansion force, the insulating film at the corner of the housing is easily punctured, and the housings of the battery cells are at risk of overlapping, which is not conducive to improving the reliability of the battery cell.

[0061] To improve the reliability of a single battery cell, embodiments of this application provide a battery cell comprising an electrode assembly, a housing, a first insulating member, and a second insulating member. The housing includes a shell and a cover, forming a cavity with an opening. The electrode assembly is disposed in the cavity, and the cover is connected to the shell to seal the opening. A portion of the first insulating member covers the surface of the shell facing away from the cavity, and another portion covers the surface of the cover facing away from the cavity. The second insulating member is sleeved on the outer periphery of the shell and stacked with the first insulating member. Along the opening direction, the end face of the second insulating member is flush with or protrudes from the end face of the shell. In the above structure, because the second insulating member is sleeved on the outer periphery of the shell and stacked with the first insulating member, and along the opening direction, the end face of the second insulating member is flush with or protrudes from the end face of the shell, the second insulating member can still insulate the shell from external devices even after the first insulating member is punctured by the shell. This allows the battery cell to achieve good insulation from external devices and has good reliability.

[0062] The battery cells described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0063] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0064] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0065] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0066] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0067] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0068] In some embodiments of the present application, the battery device 2 can not only serve as the power source for operating the vehicle 1, but also serve as the driving power source for the vehicle 1, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1.

[0069] Figure 2 A split structure schematic diagram of the battery device provided in some embodiments of the present application is shown in FIG. 1. As shown in FIG. 1, the battery device 2 includes a box body 5 and a battery cell 7, and the battery cell 7 is contained in the box body 5. The battery cell 7 can be the smallest unit constituting a battery. Figure 2

[0070] The box body 5 is used to contain the battery cell 7, and the box body 5 can be of various structures. In some embodiments, the box body 5 can include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b are mutually covered, and the first box body part 5a and the second box body part 5b jointly define a containing space 5c for containing the battery cell 7. The second box body part 5b can be a hollow structure with one end open, and the first box body part 5a is a plate-shaped structure, which is covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c; or the first box body part 5a and the second box body part 5b can both be a hollow structure with one side open, and the open side of the first box body part 5a is covered on the open side of the second box body part 5b to form the box body 5 with the containing space 5c. Of course, the first box body part 5a and the second box body part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0071] In order to improve the sealing performance of the first box body part 5a and the second box body part 5b after being connected, a sealing member such as sealing glue, a sealing ring, etc. can be arranged between the first box body part 5a and the second box body part 5b.

[0072] Supposing that the first box body part 5a is covered on the top of the second box body part 5b, the first box body part 5a can also be referred to as an upper box cover, and the second box body part 5b can also be referred to as a lower box body.

[0073] In the battery device 2, the battery cell 7 can be one or multiple. If the battery cell 7 is multiple, the multiple battery cells 7 can be connected in series, in parallel or in a mixed manner. The mixed manner means that there are both series connection and parallel connection among the multiple battery cells 7. The multiple battery cells 7 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 7 is contained in the box body 5; of course, the multiple battery cells 7 can first be connected in series, in parallel or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is contained in the box body 5.

[0074] Some embodiments of the present application provide a battery cell 7, which includes an electrode assembly 8, a housing 9, a first insulation member 11 and a second insulation member 12, as shown in FIG. 2. Figure 3 ​The outer shell 9 includes a shell 91 and a cover 92. The shell 91 forms a cavity 10 with an opening 101, and the electrode assembly 8 is arranged in the cavity 10. The cover 92 is connected to the shell 91 to seal the opening 101. Referring to Figure 4 Part of the first insulating member 11 covers the surface of the shell 91 away from the cavity 10, and another part of the first insulating member 11 covers the surface of the cover 92 away from the cavity 10. The second insulating member 12 is sleeved on the outer periphery of the shell 91 and is arranged in layers with the first insulating member 11. The end surface of the second insulating member 12 is flush with or protrudes from the end surface of the outer shell 9.

[0075] The electrode assembly 8 is a component in which electrochemical reactions occur in the battery cell 7. One or more electrode assemblies 8 can be contained in the outer shell 9. The electrode assembly 8 can include a sheet and a separator. The sheet can include a positive sheet or a negative sheet with opposite polarities. The positive sheet and the negative sheet can serve as a positive electrode and a negative electrode, respectively. During charging and discharging of the battery cell 7, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged in layers between the positive sheet and the negative sheet to separate the positive sheet and the negative sheet. The separator prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0076] The outer shell 9 can be a component of the battery cell 7 for enclosing a sealed space, which is used to accommodate other components in the battery cell 7. The shell 91 and the cover 92 are two parts of the outer shell 9 that are connected to each other. The shell 91 encloses a cavity 10 with an opening 101, allowing the electrode assembly 8 and other components to be easily loaded into the cavity 10 from the opening 101. The cover 92 can be a part for sealing the opening 101. The cover 92 is sealingly connected to the shell 91 to form a sealed space in the cavity 10.

[0077] The first insulating member 11 can be a component with insulating properties. By covering the outer surface of the outer shell 9, the battery cell 7 has good insulation ability and is less likely to short circuit with adjacent battery cells 7, which helps to improve the reliability of the battery device 2. The first insulating member 11 can be a thin film structure, which has a relatively small thickness and occupies less internal space of the battery device 2.

[0078] The first insulating member 11 can be made of plastic, rubber, or other materials with insulating properties, so that it has good insulating properties. The first insulating member 11 can be a thin film structure made of polyethylene terephthalate, so that the first insulating member 11 has good wear resistance, mechanical strength, and explosion-proof and flame-retardant properties.

[0079] By covering part of the first insulating member 11 with the surface of the shell 91 facing away from the cavity 10, and covering another part of the first insulating member 11 with the surface of the cover 92 facing away from the cavity 10, the first insulating member 11 can be better wrapped on the outer surface of the outer shell 9, and the outer shell 9 can be wrapped in a larger area.

[0080] The second insulating member 12 can be a member with insulating properties, which is arranged in layers with the first insulating member 11 by being sleeved on the outer periphery of the shell 91, so as to reduce the possibility of electrical connection between the outer shell 9 and external devices, and facilitate good insulation between the battery monomer 7 and external devices.

[0081] Exemplarily, the second insulating member 12 and the first insulating member 11 are arranged in layers, which can be that the second insulating member 12 and the first insulating member 11 are arranged in layers, and the second insulating member 12 is located on the outer side of the first insulating member 11 away from the cavity 10; or the second insulating member 12 and the first insulating member 11 are arranged in layers, and the second insulating member 12 is located between the first insulating member 11 and the outer shell 9.

[0082] By making the end surface of the second insulating member 12 along the opening 101 flush with the end surface of the outer shell 9 along the opening 101, the corner on the end surface along the opening 101 of the outer shell 9 can still be protected by the second insulating member 12 in the direction perpendicular to the opening 101 when the first insulating member 11 is pierced, and is not easy to be electrically connected with external devices.

[0083] The end surface of the second insulating member 12 along the opening 101 protruding from the end surface of the outer shell 9 along the opening 101 can mean that the second insulating member 12 sleeved on the outer periphery of the shell 91 along the opening 101 can extend outward from the end surface of the second insulating member 12 to provide secondary insulation protection for the corner on the end surface along the opening 101. By making the end surface of the second insulating member 12 along the opening 101 protruding from the end surface of the outer shell 9 along the opening 101, the corner on the end surface along the opening 101 of the outer shell 9 can still be protected by the second insulating member 12 when the first insulating member 11 is pierced, and is not easy to be electrically connected with external devices.

[0084] In the above structure, since the second insulating member 12 is sleeved on the outer periphery of the shell 91 and arranged in layers with the first insulating member 11, and the end surface of the second insulating member 12 along the opening 101 is flush with or protrudes from the end surface of the outer shell 9, the second insulating member 12 can still insulate and isolate the outer shell 9 from external devices after the first insulating member 11 is pierced by the outer shell 9, so that the battery monomer 7 can be well insulated from external devices, and has good reliability.

[0085] In some embodiments, with reference to Figure 4The surface of the shell 91 protruding from the cover 92 away from the cavity 10 in the direction of the opening 101 can mean that the shell 91 extends outwardly from the surface of the cover 92 away from the cavity 10 in the direction of the opening 101, so that a protrusion protruding in the direction of the opening 101 is formed at the opening 101 of the battery cell 7.

[0086] The surface of the shell 91 protruding from the cover 92 away from the cavity 10 in the direction of the opening 101 can mean that the shell 91 extends outwardly from the surface of the cover 92 away from the cavity 10 in the direction of the opening 101, so that a protrusion protruding in the direction of the opening 101 is formed at the opening 101 of the battery cell 7.

[0087] The surface of the shell 91 protruding from the cover 92 away from the cavity 10 in the direction of the opening 101 can mean that the shell 91 extends outwardly from the surface of the cover 92 away from the cavity 10 in the direction of the opening 101, so that a protrusion protruding in the direction of the opening 101 is formed at the opening 101 of the battery cell 7.

[0088] In some embodiments, referring to Figure 5 The surface of the shell 91 protruding from the cover 92 away from the cavity 10 in the direction of the opening 101 can mean that the shell 91 extends outwardly from the surface of the cover 92 away from the cavity 10 in the direction of the opening 101, so that a protrusion protruding in the direction of the opening 101 is formed at the opening 101 of the battery cell 7.

[0089] The surface of the shell 91 protruding from the cover 92 away from the cavity 10 in the direction of the opening 101 can mean that the shell 91 extends outwardly from the surface of the cover 92 away from the cavity 10 in the direction of the opening 101, so that a protrusion protruding in the direction of the opening 101 is formed at the opening 101 of the battery cell 7.

[0090] The surface of the shell 91 protruding from the cover 92 away from the cavity 10 in the direction of the opening 101 can mean that the shell 91 extends outwardly from the surface of the cover 92 away from the cavity 10 in the direction of the opening 101, so that a protrusion protruding in the direction of the opening 101 is formed at the opening 101 of the battery cell 7.

[0091] In some embodiments, the thickness of the second insulating member 12 is set as H, 0.03mm≤H≤1.5mm.

[0092] By setting the thickness H of the second insulating member 12 in the range of 0.03mm≤H≤1.5mm, not only does the second insulating member 12 have sufficient structural strength and is not prone to cracking or damage, but also the second insulating member 12 is not prone to wasting materials and space of the battery device 2 due to excessive thickness.

[0093] In some embodiments, the thickness H of the second insulating member 12 can be set in a range of 0.05 mm≤H≤1 mm, and exemplarily, the thickness H of the second insulating member 12 can be set as 0.1 mm, 0.2 mm or 0.3 mm, so that the second insulating member 12 not only has sufficient structural strength and is not prone to breakage or damage, but also does not waste materials and space of the battery device 2 due to excessive thickness.

[0094] In some embodiments, the size of the second insulating member 12 in the opening 101 direction is G1, the size of the shell 9 in the opening 101 direction is G2, and 0.01%≤G1 / G2≤15%.

[0095] By setting the size of the second insulating member 12 in the opening 101 direction as G1, the size of the shell 9 in the opening 101 direction as G2, and the ratio of G1 and G2 in a range of 0.01%≤G1 / G2≤15%, the second insulating member 12 not only has sufficient size in the opening 101 direction to insulate and isolate the corner on the end surface of the shell 9 in the opening 101 direction, but also does not have redundant size in the opening 101 direction, which is conducive to reducing the cost of the second insulating member 12.

[0096] In some embodiments, by setting the ratio of G1 and G2 in a range of 0.01%≤G1 / G2≤10%, and exemplarily, the ratio of G1 and G2 can be set as 2%, 3% or 5%, the second insulating member 12 not only has sufficient size in the opening 101 direction to insulate and isolate the corner on the end surface of the shell 9 in the opening 101 direction, but also does not have redundant size in the opening 101 direction, which is conducive to reducing the cost of the second insulating member 12.

[0097] In some embodiments, the second insulating member 12 is a rubber structure or a plastic structure.

[0098] The second insulating member 12 is a rubber structure or a plastic structure. It can mean that the second insulating member 12 is made of rubber or plastic. By setting the second insulating member 12 as a rubber structure or a plastic structure, the second insulating member 12 has good insulation.

[0099] Exemplarily, the second insulating member 12 can be a silica gel structure, a polycarbonate structure, a polyphenylene sulfide structure or a polyimide structure.

[0100] In some embodiments, the shell 9 is a steel structure.

[0101] The shell 9 is a steel structure, which means that the shell 9 is made of steel, so that the shell 9 is a steel shell. At present, with the increasing requirement of the energy density of the battery monomer 7, the steel shell with strong structural strength is more and more favored by the person skilled in the art. By setting the steel shell 9, the person skilled in the art can increase the available space inside the battery monomer 7 by thinning the thickness of the shell 9, so as to greatly improve the energy density of the battery monomer 7.

[0102] Exemplarily, the shell 9 can also be an aluminum structure, an aluminum alloy structure or a plastic structure, and the person skilled in the art can select the material of the shell 9 according to the actual situation.

[0103] In some embodiments, the shell 91 includes a bottom wall 911 and a side wall 912 connected around the outer periphery of the bottom wall 911, and the bottom wall 911 is arranged opposite to the opening 101; the battery monomer 7 further includes a third insulating member 13 covering one side of the bottom wall 911 away from the container cavity 10.

[0104] The bottom wall 911 and the side wall 912 are different wall structures connected to each other in the shell 91. By connecting the side wall 912 around the outer periphery of the bottom wall 911, the bottom wall 911 and the side wall 912 enclose the container cavity 10 with the opening 101, wherein the bottom wall 911 is arranged as a wall structure opposite to the opening 101.

[0105] The third insulating member 13 can be a component with insulating properties. By covering the third insulating member 13 on one side of the bottom wall 911 away from the container cavity 10, the outer side of the bottom wall 911 can be protected by the third insulating member 13, which not only reduces the possibility of damage to the bottom wall 911 caused by external impact, but also enables the third insulating member 13 to act as a buffer between the bottom wall 911 and the carrier of the battery monomer 7, reducing the impact on the bottom wall 911.

[0106] In some embodiments, the third insulating member 13 includes a bottom pad portion 131 and a surrounding portion 134 connected around the outer periphery of the bottom pad portion 131, the bottom pad portion 131 covers one side of the bottom wall 911 away from the container cavity 10, and the surrounding portion 134 is sleeved around the outer periphery of the side wall 912.

[0107] The bottom pad portion 131 and the surrounding portion 134 are different parts connected to each other in the third insulating member 13. The bottom pad portion 131 is a part of the third insulating member 13 covering the outer side of the bottom wall 911 away from the container cavity 10, and the bottom pad portion 131 is used to protect the bottom wall 911; the surrounding portion 134 is sleeved around the outer periphery of the side wall 912, and is bent towards the opening 101 relative to the bottom pad portion 131, so that the bottom pad portion 131 and the surrounding portion 134 can protect the connection (corner) between the bottom wall 911 and the side wall 912.

[0108] In some embodiments, the outer surface of the second insulation member 12 and / or the third insulation member 13 is provided with a friction structure.

[0109] The friction structure can be a structure provided on the outer surface of the second insulation member 12 or the outer surface of the third insulation member 13 for increasing the friction. The outer surface of the second insulation member 12 and / or the outer surface of the third insulation member 13 being provided with a friction structure can mean that the outer surface of the second insulation member 12 is provided with a friction structure so that the operator can conveniently take and place the battery cell 7 through the second insulation member 12; can also mean that the outer surface of the third insulation member 13 is provided with a friction structure so that the battery cell 7 is not prone to sliding when located on the carrier, which is conducive to improving the reliability of the battery cell 7 during use; or can also mean that the outer surface of the second insulation member 12 and the outer surface of the third insulation member 13 are both provided with a friction structure to increase the friction between the battery cell 7 and external devices.

[0110] In some embodiments, the friction structure includes protrusions protruding from the outer surface of the second insulation member 12 and / or the outer surface of the third insulation member 13.

[0111] The friction structure including protrusions protruding from the outer surface of the second insulation member 12 and / or the outer surface of the third insulation member 13 can mean that the friction structure includes protrusions protruding from the outer surface of the second insulation member 12, so that the protrusions protruding from the outer surface of the second insulation member 12 can form a friction structure on the outer surface of the second insulation member 12 to increase the friction of the outer surface of the second insulation member 12; can also mean that the friction structure includes protrusions protruding from the outer surface of the third insulation member 13, so that the protrusions protruding from the outer surface of the third insulation member 13 can form a friction structure on the outer surface of the third insulation member 13 to increase the friction of the outer surface of the third insulation member 13; or can also mean that the friction structure includes protrusions protruding from the outer surface of the second insulation member 12 and protrusions protruding from the outer surface of the third insulation member 13, so that the protrusions protruding from the outer surface of the second insulation member 12 can form a friction structure on the outer surface of the second insulation member 12 to increase the friction of the outer surface of the second insulation member 12, and the protrusions protruding from the outer surface of the third insulation member 13 can form a friction structure on the outer surface of the third insulation member 13 to increase the friction of the outer surface of the third insulation member 13.

[0112] In other embodiments, the friction structure can also include notches provided on the outer surface of the second insulation member 12 and / or the outer surface of the third insulation member 13, which can increase the roughness of the outer surface of the second insulation member 12 and / or the outer surface of the third insulation member 13.

[0113] Some embodiments of the present application also provide a battery device 2, which includes a box 5 and the battery cell 7 provided by any of the technical solutions described above, and the battery cell 7 is located in the box 5.

[0114] Since the battery device 2 comprises the battery cell 7 provided by the technical scheme, the battery device 2 has good reliability.

[0115] In some embodiments, the battery cell 7 is provided in plurality, the openings 101 of the plurality of battery cells 7 are arranged in the same direction, and the plurality of battery cells 7 are arranged along a first direction X to form a battery cell 7 assembly, the first direction X being perpendicular to the direction in which the openings 101 of the battery cells 7 face. Figure 6 The battery device 2 further comprises a fourth insulating member 14, the fourth insulating member 14 covering the outer side of the shell 91 away from the openings 101 of the battery cell 7 assembly.

[0116] The plurality of battery cells 7 are arranged in the battery device 2, and the plurality of battery cells 7 are electrically connected, which is conducive to improving the capacity of the battery device 2.

[0117] By arranging the openings 101 of the plurality of battery cells 7 in the same direction and arranging the plurality of battery cells 7 along the first direction X to form the battery cell 7 assembly, the first direction X being perpendicular to the direction in which the openings 101 of the battery cells 7 face, the plurality of battery cells 7 are arranged along the direction perpendicular to the direction in which the openings 101 of the battery cells 7 face, so that the plurality of battery cells 7 can be more conveniently arranged to form the battery cell 7 assembly.

[0118] The fourth insulating member 14 can be a member having insulating properties. By covering the fourth insulating member 14 on the outer side of the shell 91 away from the openings 101 of the battery cell 7 assembly, the outer side of the shell 91 away from the openings 101 of the battery cell 7 assembly can be protected by the fourth insulating member 14, which not only reduces the possibility of being damaged by external impact, but also enables the fourth insulating member 14 to play a buffering role between the shell 91 and the bearing member of the battery cell 7 assembly, reducing the impact on the shell 91.

[0119] In some embodiments, referring to Figure 7 The battery device 2 further comprises a buffer member 15, the buffer member 15 being clamped between two adjacent battery cells 7, the thickness of the second insulating member 12 being equal to or less than half the thickness of the buffer member 15 along the first direction X.

[0120] The buffer member 15 can be a device for absorbing the expansion of the battery cell 7. By clamping the buffer member 15 between two adjacent battery cells 7, the buffer member 15 can buffer the expansion of the battery cell 7 in the first direction X.

[0121] By setting the thickness of the second insulation member 12 in the first direction X to be less than or equal to half of the thickness of the buffer member 15 in the first direction X, the battery cells 7 provided with the second insulation member 12 can be arranged more conveniently in the first direction X, so that the insulation member can be clamped between the housings 91 of two adjacent battery cells 7, and the second insulation member 12 is less likely to abut each other, so that the expansion of the battery cells 7 in the first direction X can be absorbed by the buffer member 15.

[0122] In some embodiments, the fourth insulation member 14 includes a bottom portion 141 and a surrounding portion 142 connected to the outer periphery of the bottom portion 141, the bottom portion 141 covers the outer side of the housing 91 away from the opening 101 in the battery cell 7 assembly, and the surrounding portion 142 is sleeved on the outer periphery of the battery cell 7 assembly.

[0123] The bottom portion 141 and the surrounding portion 142 can be two parts of the fourth insulation member 14 connected to each other. By connecting the surrounding portion 142 to the outer periphery of the bottom portion 141, and covering the bottom portion 141 on the outer side of the housing 91 away from the opening 101 in the battery cell 7 assembly, and sleeving the surrounding portion 142 on the outer periphery of the battery cell 7 assembly, the bottom portion 141 of the entire battery cell 7 assembly is protected by the fourth insulation member 14, and the corners of the bottom portion 141 of the entire battery cell 7 assembly are also protected by the fourth insulation member 14.

[0124] In some embodiments, referring to Figure 8 , the fourth insulation member 14 further includes a separation portion 143 connected to the surrounding portion 142 and the bottom portion 141, and the separation portion 143 is located between two adjacent battery cells 7.

[0125] The separation portion 143 can be a structure of the fourth insulation member 14 arranged between two adjacent battery cells 7. By connecting the separation portion 143 to the bottom portion 141 and the surrounding portion 142, the separation portion 143 is arranged between two adjacent battery cells 7, so that the fourth insulation member 14 can protect the corners of the bottom portion 141 of each battery cell 7, further improving the reliability of the battery cell 7.

[0126] Some embodiments of the present application also provide a power utilization device, which includes the battery device 2 provided by any of the technical solutions described above, and the battery is used to provide electric energy.

[0127] Some embodiments of the present application provide a battery cell 7, which comprises an electrode assembly 8, an outer shell 9, a first insulating member 11 and a second insulating member 12. The outer shell 9 comprises a shell body 91 and a cover body 92. The shell body 91 forms a cavity 10 with an opening 101. The electrode assembly 8 is arranged in the cavity 10. The cover body 92 is connected to the shell body 91 to seal the opening 101. The shell body 91 has a surface facing away from the cavity 10 along the opening 101 and protruding from the cover body 92. Part of the first insulating member 11 covers the surface of the shell body 91 facing away from the cavity 10. Another part of the first insulating member 11 covers the surface of the cover body 92 facing away from the cavity 10. The second insulating member 12 is sleeved on the outer periphery of the shell body 91 and is arranged in layers with the first insulating member 11. The end surface of the second insulating member 12 is flush with or protrudes from the end surface of the outer shell 9 along the opening 101.

[0128] In the above structure, since the second insulating member 12 is sleeved on the outer periphery of the shell body 91 and is arranged in layers with the first insulating member 11, and the end surface of the second insulating member 12 is flush with or protrudes from the end surface of the outer shell 9 along the opening 101, the second insulating member 12 can still insulate and isolate the outer shell 9 from external devices after the first insulating member 11 is pierced by the outer shell 9, so that the battery cell 7 can achieve good insulation with external devices and has good reliability.

[0129] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature 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 cell, characterized by, The battery cell comprises: an electrode assembly; a shell comprising a shell body and a cover body, the shell body forms a cavity with an opening, the electrode assembly is arranged in the cavity, and the cover body is connected to the shell body to seal the opening; a first insulation member, part of the first insulation member covers a surface of the shell body away from the cavity, and another part of the first insulation member covers a surface of the cover body away from the cavity; a second insulation member, the second insulation member is sleeved on the outer periphery of the shell body and is arranged in layers with the first insulation member; and the end surface of the second insulation member in the opening direction is flush with or protrudes from the end surface of the shell body.

2. The battery cell of claim 1, wherein, The shell body protrudes from the surface of the cover body away from the cavity in the opening direction; and the end surface of the second insulation member in the opening direction is flush with or protrudes from the end surface of the shell body in the opening direction.

3. The battery cell of claim 1, wherein, The cover body is connected to the outer side of the shell body in the opening direction, and the end surface of the second insulation member in the opening direction is flush with or protrudes from the end surface of the cover body.

4. The battery cell of claim 1, wherein, The thickness of the second insulation member is H, and 0.03mm≤H≤1.5mm.

5. The battery cell of claim 4, wherein, 0.05mm≤H≤1mm.

6. The battery cell of any one of claims 1-5, wherein, The size of the second insulation member in the opening direction is G1, and the size of the shell body in the opening direction is G2, and 0.01%≤G1 / G2≤15%.

7. The battery cell of claim 6, wherein, 0.01%≤G1 / G2≤10%.

8. The battery cell of any one of claims 1-5, wherein, The second insulation member is a rubber structure or a plastic structure.

9. The battery cell of any one of claims 1-5, wherein, The shell body is a steel structure.

10. The battery cell of any one of claims 1-5, wherein, The shell body comprises a bottom wall and a side wall connected to the outer periphery of the bottom wall, and the bottom wall and the opening are oppositely arranged; and the battery cell further comprises a third insulation member, and the third insulation member covers one side of the bottom wall away from the cavity.

11. The battery cell of claim 10, wherein, The third insulation member comprises a bottom pad portion and a surrounding portion connected to the outer periphery of the bottom pad portion, the bottom pad portion covers one side of the bottom wall away from the cavity, and the surrounding portion is sleeved on the outer periphery of the side wall.

12. The battery cell of claim 10, wherein, The outer surface of the second insulation member and / or the outer surface of the third insulation member is provided with a friction structure.

13. The battery cell of claim 12, wherein, The friction structure comprises a protrusion protruding from the outer surface of the second insulation member and / or the outer surface of the third insulation member.

14. A battery device characterized by comprising: The battery device comprises: a box body; the battery cell according to any one of claims 1-9 is arranged in the box body.

15. The battery device of claim 14, wherein, A plurality of battery cells are arranged, the openings of the plurality of battery cells are arranged in the same direction, and the plurality of battery cells are arranged in a first direction to form a battery cell assembly, and the first direction is perpendicular to the opening direction of the battery cell; The battery device further comprises a fourth insulation member, and the fourth insulation member covers the outer side of the shell body away from the opening in the battery cell assembly.

16. The battery device of claim 15, wherein, The battery device further comprises a buffer member, and the buffer member is clamped between two adjacent battery cells; and the thickness of the second insulation member in the first direction is equal to or less than half the thickness of the buffer member.

17. The battery device according to claim 15 or 16, characterized by The fourth insulation member comprises a bottom portion and a surrounding portion connected to the outer periphery of the bottom portion, the bottom portion covers the outer side of the shell body away from the opening in the battery cell assembly, and the surrounding portion is sleeved on the outer periphery of the battery cell assembly.

18. The battery device of claim 17, wherein, The fourth insulating member further includes a partition portion connected to the surrounding portion and the bottom portion, the partition portion being located between two adjacent battery cells.

19. An electrical device, comprising: A battery device as claimed in any one of claims 14 to 18, the battery being for providing electrical energy.

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