Battery device, power utilization device and energy storage device

Abstract

The utility model discloses a battery device, a power utilization device and an energy storage device. The battery device comprises a battery monomer assembly, the battery monomer assembly comprises a plurality of battery monomers and an electric connecting piece, a shell of each battery monomer comprises a shell body and a cover body, the cover body covers an end opening of the shell body and is connected with the shell body, the cover body is provided with a groove, and the groove peripheral wall of the groove is separated from the peripheral edge of the cover body; the electric connection part is arranged on the groove bottom wall of the groove and is electrically connected with the electrode assembly; the electric connecting piece comprises a first connecting part, a second connecting part and a third connecting part, the first connecting part is electrically connected with the electric connecting part of the battery monomer, the second connecting part is positioned outside the groove and is positioned on one side, far away from the electric connecting part, of the first connecting part in the first direction, and the third connecting part is connected with the first connecting part and the second connecting part. According to the technical scheme, the connection track of the cover body and the shell body is not interfered by the groove, the connection difficulty is reduced, and the machining yield is improved. The electric connecting piece is of a bent structure, so that electric connection is facilitated, and position interference is not easy to form.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technology field, specifically, relate to a battery device, electric device and energy storage device. BACKGROUND

[0002] In the related art, a concave battery is used, so that the tab and the electrical connection part can share the height space, and the space utilization rate in the battery shell is improved. However, the above structure leads to a high difficulty in processing the shell of the battery, a low yield, and a difficulty in mass production. SUMMARY

[0003] The utility model embodiment provides a kind of battery device, electric device and energy storage device, reduce the difficulty in processing shell, improve the yield, be conducive to the realization of mass production.

[0004] In the first aspect, the utility model embodiment provides a kind of battery device, including battery monomer subassembly, the battery monomer subassembly includes multiple battery monomers, the battery monomer includes shell and electrical connection part, the shell includes shell body and cover, the shell body defines the receiving cavity for accommodating electrode assembly, the receiving cavity at least one end in first direction has end opening, the cover is covered at the end opening and is connected with the shell body, the cover is equipped with recess, the groove peripheral wall of the recess is spaced apart from the circumferential edge of the cover, the electrical connection part is located in the groove bottom wall of the recess and is electrically connected with the electrode assembly;Multiple battery monomers are arranged along the second direction and are electrically connected by electrical connector, the second direction intersects with the first direction, the electrical connector includes first connecting part, second connecting part and third connecting part, the first connecting part is electrically connected with the electrical connection part of the battery monomer, the second connecting part is located outside the recess and is located in the first direction on the side of the first connecting part away from the electrical connection part, and the third connecting part connects the first connecting part and the second connecting part.

[0005] In the above technical solution, by making the groove peripheral wall of the recess on the cover spaced apart from the circumferential edge of the cover, and making the electrical connection part located in the groove bottom wall of the recess, the connection track of the cover and the shell body is not disturbed by the recess, which is conducive to making the connection track structure simpler, thereby reducing the connection difficulty, reducing the processing difficulty of the shell, improving the processing yield and being conducive to the mass production of the shell. The electrical connector is formed into a bent structure, which facilitates the electrical connection between the first connecting part and the electrical connection part, and allows the second connecting part to avoid the area on the cover where no recess is provided, so that the electrical connector and the cover are not easily positionally interfered.

[0006] In some embodiments, the recess is recessed along the first direction, and in at least one direction perpendicular to the first direction, the projection of the recess and the electrode assembly at least partially overlaps.

[0007] In the technical solution, the groove and the electrode assembly can at least partially share space in the first direction, and the electrode assembly can fully utilize the space of at least one side of the groove perpendicular to the first direction, thereby improving the space utilization of the accommodation cavity and improving the performance of the battery monomer.

[0008] In some embodiments, the part of the electrical connection part outside the shell is a first part, and the first part is located in the groove.

[0009] In the technical solution, the part of the electrical connection part outside the shell is completely located in the groove, without occupying space outside the groove. The arrangement of the electrical connection part does not increase the overall occupied space of the battery monomer in the depth direction of the groove, which is conducive to making the structure of the battery monomer more compact.

[0010] In some embodiments, the distance between the end surface of the first part facing away from the groove bottom wall and the groove opening is 0mm-5mm.

[0011] In the technical solution, the first part can be electrically connected with the electrical connection part, which is conducive to reducing the overall occupied space of the battery monomer assembly including the battery monomer in the first direction.

[0012] In some embodiments, the part of the electrical connection part outside the shell includes a first part and a second part, the first part is located in the groove, and the second part is located outside the groove, and the height of the second part beyond the groove opening is less than or equal to 1mm.

[0013] In the technical solution, the second part outside the groove can be used for electrical connection with the electrical connection part, so that the structure of the electrical connection part is not affected by the groove, which is conducive to making the structure of the electrical connection part simpler, reducing cost and facilitating connection. Moreover, the height of the electrical connection part beyond the groove opening is small, which is conducive to reducing the overall occupied space of the battery monomer assembly including the battery monomer and the electrical connection part in the first direction.

[0014] In some embodiments, the electrical connection part includes a positive electrode connection part and a negative electrode connection part, and the parts of the positive electrode connection part and the negative electrode connection part outside the shell are located in the same groove.

[0015] In the technical solution, only one groove needs to be arranged on the cover, which is conducive to simplifying the structure of the cover and facilitating processing. Moreover, the positive electrode connection part and the negative electrode connection part can be located on the same side of the shell, so that the electrical connection structure such as the electrical connection part of the battery monomer assembly can be located on the same side, and the space arrangement is more reasonable.

[0016] In some embodiments, the battery cell assembly is multiple, at least two of the battery cell assemblies are arranged in a stacked manner along the first direction, the other end of the shell body in the first direction is an end wall opposite to the end opening, the end wall is provided with a avoiding slot, and the electrical connection part and / or the electrical connecting piece connected thereto of one of the battery cell assemblies is at least partially located in the avoiding slot of the other of the battery cell assemblies.

[0017] In the above technical solution, the part of the electrical connection part and the electrical connecting piece that exceeds the groove notch can be accommodated in the avoiding slot, so that the shells of the two battery cell assemblies do not need to be spaced apart to avoid the exceeding part, and the shells of the two battery cell assemblies can be closely attached, which is beneficial to improve the overall assembly stiffness.

[0018] In some embodiments, the avoiding slot penetrates the end wall along the second direction.

[0019] In the above technical solution, the structure of the avoiding slot is simpler, and the avoiding slot can avoid different structures of the electrical connection part and the electrical connecting piece, which is more versatile, and is beneficial to reduce production cost and production difficulty.

[0020] In some embodiments, at least one side of the shell body in a third direction is provided with a pressure relief part, and the first direction, the second direction and the third direction intersect with each other.

[0021] In the above technical solution, no exhaust space needs to be reserved on both sides in the first direction, the space utilization rate of the battery device in the first direction is improved, and it is convenient to directly stack multiple battery cells in the first direction, for example, the shells of adjacent battery cells can be directly abutted to improve the overall structural stiffness.

[0022] In some embodiments, the electrical connection part includes a positive electrode connection part and a negative electrode connection part, and the projections of the positive electrode connection part and the negative electrode connection part on the second direction at least partially overlap.

[0023] In the above technical solution, the electrical connecting pieces between the multiple battery cells can be electrically connected along the second direction, and the multiple electrical connecting pieces can be arranged along the second direction, so as to reduce the occupied space of the electrical connection structure in the third direction, the structure is more compact, and the position interference between the multiple electrical connecting pieces is less likely to occur.

[0024] In a second aspect, the utility model embodiment further provides a kind of energy storage device comprising above-mentioned battery device, and the battery device is used to store or provide electric energy.

[0025] In a third aspect, the utility model embodiment further provides a kind of electric device comprising above-mentioned battery device or above-mentioned energy storage device, and the battery device is used to store or provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic view of a vehicle provided by an embodiment of the present application is shown in the figure;

[0027] Figure 2 A schematic view of a battery device provided by an embodiment of the present application is shown in the figure;

[0028] Figure 3 An exploded view of a battery cell provided by an embodiment of the present application is shown in the figure;

[0029] Figure 4 A structural schematic view of a battery cell assembly provided by an embodiment of the present application is shown in the figure;

[0030] Figure 5 A structural schematic view of a battery cell assembly provided by an embodiment of the present application is shown in the figure; Figure 4 An enlarged structural schematic view of the A part in the middle circle is shown in the figure;

[0031] Figure 6 A structural schematic view of an electrical connecting piece provided by an embodiment of the present application is shown in the figure;

[0032] Figure 7 A schematic view of two battery cell assemblies arranged along a first direction provided by an embodiment of the present application is shown in the figure;

[0033] Figure 8 A schematic view of an energy storage device provided by an embodiment of the present application is shown in the figure.

[0034] REFERENCE SIGNS:

[0035] Vehicle 1; battery device 1000; controller 2000; motor 3000; energy storage device 2;

[0036] Battery cell assembly 100;

[0037] Box 10; first box 11; second box 12;

[0038] Battery cell 20;

[0039] Housing 30; housing body 31; accommodating cavity 311; end opening 312; end wall 313; avoiding groove 314; cover 32; recess 321;

[0040] Electrode assembly 40; tab 41;

[0041] Electrical connecting part 50; first part 51; positive electrode connecting part 52; negative electrode connecting part 53;

[0042] Electrical connecting piece 60; first connecting part 61; second connecting part 62; third connecting part 63;

[0043] Pressure relief part 70;

[0044] a first direction F1; a second direction F2; a third direction F3. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application or the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0047] In the present application, "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment independent of or alternative to other embodiments.

[0048] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "attachment" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0050] In the embodiments of the utility model, same reference signs represent same components, and for the sake of brevity, detailed description of same components is omitted in different embodiments.It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the utility model shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary, and should not constitute any limitation on the utility model.

[0051] In the utility model, "multiple" refers to more than two (including two).

[0052] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity.The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through electrical connections.

[0053] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0054] As an example, the battery cell assembly can be a battery module 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.

[0055] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0056] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0057] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0058] As an example, the box can include a first box and a second box.The first box and the second box are buckled so that a closed space is formed inside the box to accommodate the battery cell assembly.The closed here means covered or closed, which can be sealed or unsealed.The first box can be a top cover or a bottom plate.

[0059] As an example, the box can include a top cover, a frame and a bottom plate.The top cover and the bottom plate are connected with the frame respectively, so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0060] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, portions of the box can become at least part of a floor of the vehicle, or portions of the box can become at least part of cross beams and longitudinal beams of the vehicle.

[0061] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0062] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited in this regard. The battery cell can be in the shape of a cylinder, a cuboid or other shapes, etc. The embodiments of the present application are also not limited in this regard.

[0063] The battery cell includes a housing, an electrode component and an electrolyte (in a solid-state battery, it can be a solid-state electrolyte layer located between the positive and negative electrode sheets), the electrode component includes at least one electrode assembly, the electrode assembly and the electrolyte are both accommodated in the housing, the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator film (which can be omitted in a solid-state battery). The battery cell mainly works by moving metal ions between the positive and negative electrode sheets.

[0064] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab sheet. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc.

[0065] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab sheet. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc.

[0066] The material of the separator film can be PP, polypropylene or PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of the present application is in a wound or stacked structure.

[0067] The electrode assembly can be in a wound structure or a stacked structure. During processing, the positive electrode sheet, the negative electrode sheet and the separator film are wound or stacked in sequence to obtain the electrode assembly. In the electrode assembly, a plurality of positive electrode tabs are stacked together and electrically connected to the positive connection part, and a plurality of negative electrode tab sheets are stacked together and electrically connected to the negative connection part.

[0068] Embodiments of the present application provide a kind of energy storage device, including one or more battery cluster (Battery Cluster) to promote the voltage and capacity of energy storage device. Battery cluster can include multiple battery devices, multiple battery devices are connected in series by busbar component to improve the voltage of energy storage device. When energy storage device includes multiple battery clusters, multiple battery clusters are connected in parallel to improve the capacity of energy storage device.

[0069] In some embodiments, the energy storage device can include a cabinet and one or more battery clusters, and the battery clusters are housed in the cabinet.

[0070] In some embodiments, the energy storage device can include a thermal management module, a master control module, a general control module, a power distribution module and a fire control module, etc.

[0071] As an example, the thermal management module can include a liquid cooling unit, which provides cooling liquid to each battery device through a pipeline for adjusting the temperature of the battery cell.

[0072] As an example, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor the current, voltage, power or temperature information of the battery cluster. For example, the charge and discharge current and voltage of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fusion switch and other modules.

[0073] As an example, the general control module can serve as a battery management unit of the energy storage device for monitoring and managing the energy storage device. The general control module can monitor the current, voltage, power, state of charge or temperature information of the energy storage device. For example, the charge and discharge current and voltage of the energy storage device can be controlled. As an example, the general control module includes an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) and an optical fiber conversion module, etc.

[0074] As an example, the fire control system includes a control panel, a detector, an alarm device, etc., for detection, alarm or fire extinguishing.

[0075] As an example, the power distribution device can be used for power distribution to the power consumption modules of the energy storage device.

[0076] In the related art, the space utilization rate of the battery cell has an important influence on the working performance of the battery cell and the battery cell assembly, the battery device and the like comprising the battery cell. Some battery cells in the related art adopt a concave battery, that is, the shell of the battery cell is provided with a recessed area penetrating in the thickness direction, so that the electric connection parts such as the tab and the pole in the shell can share the height space in the shell, and the space utilization rate in the battery shell can be improved under the condition that the total height of the battery cell is constant. However, the special structure of the above-mentioned concave battery causes the cover body weld of the shell to be a variable trajectory weld, which is difficult to process, has a low welding yield, and is difficult to realize mass production.

[0077] In view of this, the embodiments of the present application propose a battery cell assembly comprising a plurality of battery cells. The battery cell comprises a shell and an electric connection part, the shell comprises a shell body and a cover body, the shell body defines a containing cavity for containing an electrode assembly, at least one end of the containing cavity in a first direction has an end opening, and the cover body is arranged at the end opening and connected with the shell body. The cover body is provided with a groove, the groove wall of the groove is spaced apart from the peripheral edge of the cover body, and the electric connection part is arranged on the groove bottom wall and electrically connected with the electrode assembly. The plurality of battery cells are arranged along a second direction and electrically connected through an electric connection part. The second direction intersects the first direction. The electric connection part comprises a first connection part, a second connection part and a third connection part. The first connection part is electrically connected with the electric connection part of the battery cell. The second connection part is located outside the groove and on the side of the first connection part away from the electric connection part in the first direction. The third connection part connects the first connection part and the second connection part.

[0078] In the battery device with the above structure, by spacing the groove wall of the groove on the cover body from the peripheral edge of the cover body and arranging the electric connection part on the groove bottom wall, the connection trajectory of the cover body and the shell body is not disturbed by the groove, which is beneficial to make the connection trajectory structure simpler, thereby reducing the connection difficulty, reducing the processing difficulty of the shell, improving the processing yield and facilitating the realization of mass production of the shell. The electric connection part is formed in a bent structure, which not only facilitates the electrical connection between the first connection part and the electric connection part, but also enables the second connection part to avoid the area on the cover body where the groove is not arranged, so that the electric connection part and the cover body are not easily positionally interfered.

[0079] The technical solutions described in the embodiments of the present application are applicable to the electric device or energy storage device using the battery device.

[0080] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The electric device is not specially limited in the embodiments of the present application.

[0081] The energy storage device can be an energy storage container or an energy storage cabinet. The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electric energy as needed and output the electric energy at an appropriate time. For example, the energy storage device can store electric energy at a low electricity consumption valley, and provide electric energy for related users or electric devices at a high electricity consumption peak.

[0082] The following embodiments are described by taking the electric device as a vehicle for example for convenience of description.

[0083] Please refer to Figure 1 , Figure 1 A schematic view of the vehicle 1 provided by some embodiments of the present application is shown, and the vehicle 1 is provided with a battery device 1000. The battery device 1000 can be arranged at a bottom, a head, or a tail of the vehicle 1, etc. The battery device 1000 can be used for power supply of the vehicle 1, for example, the battery device 1000 can be used as an operating power supply of the vehicle 1.

[0084] The vehicle 1 can further include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, to meet the working power demand of the vehicle 1 during starting, navigation, and driving.

[0085] In some embodiments of the present application, the battery device 1000 can not only be used as an operating power supply of the vehicle 1, but also be used as a driving power supply of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0086] Please refer to Figure 2 , Figure 2 An exploded view of the battery device 1000 provided by some embodiments of the present application is shown. The battery device 1000 includes a battery monomer assembly 100 and a box 10 used for accommodating the battery monomer assembly 100.

[0087] The battery cell assembly 100 comprises a plurality of battery cells 20. The plurality of battery cells 20 can be arranged in a stack or an array. For example, referring to Figure 2 , the plurality of battery cells 20 are arranged in a stack along a second direction F2 to form the battery cell assembly 100.

[0088] The case 10 can be of various structural forms. In some embodiments, the case 10 can comprise a first case 11 and a second case 12, the first case 11 and the second case 12 being mutually coverable, the first case 11 and the second case 12 together defining a receiving space for receiving the battery cell assembly 100. For example, referring to Figure 2 , the first case 11 and the second case 12 are each a hollow structure with one open side, and the open sides of the first case 11 and the second case 12 are mutually coverable. The case 10 can be of various shapes, such as a cylindrical case, a cuboid case, etc.

[0089] Hereinafter, a battery device according to an embodiment of the present application is described with reference to the accompanying drawings.

[0090] Please refer to Figures 2-5 , which is an exploded view of the battery cell 20 provided by the embodiment of the present application; Figure 3 , which is a structural schematic view of the battery cell assembly 100 provided by the embodiment of the present application; Figure 4 , which is an enlarged structural schematic view of the position A shown in Figure 5 , which is an enlarged structural schematic view of the position A shown in Figure 4 , the battery device 1000 comprises a battery cell assembly 100, the battery cell assembly 100 comprises a plurality of battery cells 20, and the plurality of battery cells 20 are electrically connected by an electrical connecting member 60.

[0091] Specifically, the battery cell 20 comprises a shell 30 and an electrical connecting part 50. The shell 30 comprises a shell body 31 and a cover 32, the shell body 31 defines a receiving cavity 311 for receiving an electrode assembly 40, at least one end of the receiving cavity 311 in a first direction F1 has an end opening 312, and the cover 32 is coveringly arranged at the end opening 312 and connected with the shell body 31. The cover 32 is provided with a groove 321, and a groove wall of the groove 321 is spaced apart from a peripheral edge of the cover 32. The electrical connecting part 50 is arranged at a groove bottom wall of the groove 321, and the electrical connecting part 50 is electrically connected with the electrode assembly 40.

[0092] The plurality of battery cells 20 are arranged along a second direction F2, and the second direction F2 intersects the first direction F1. As shown in Figures 4-6 , the plurality of battery cells 20 are arranged in a stack along the second direction F2 to form the battery cell assembly 100. Figure 6The utility model provides an electric connecting piece 60's structural schematic diagram provided for the embodiment of the utility model, electric connecting piece 60 includes first connecting portion 61, second connecting portion 62 and third connecting portion 63. First connecting portion 61 is electrically connected with the electric connecting portion 50 of battery monomer 20, second connecting portion 62 is located outside the recess 321, and in the first direction F1, second connecting portion 62 is located the side of first connecting portion 61 away from electric connecting portion 50, third connecting portion 63 connects first connecting portion 61 and second connecting portion 62.

[0093] The shell body 31 can have one or more end openings 312, and the corresponding cover 32 can also be one or more; the cover 32 covers the corresponding end opening 312 to seal the accommodation cavity 311, so that the electrode assembly 40 and the electrolyte in the accommodation cavity 311 can work smoothly. The connection mode of the cover 32 and the shell body 31 can be, but is not limited to, adhesion, welding, etc.

[0094] The cover 32 is provided with a recess 321, which means that part of the cover 32 is recessed into the accommodation cavity 311 to form a recessed area on the side of the cover 32 away from the accommodation cavity 311. The recess 321 has a groove bottom wall and a groove peripheral wall, the groove peripheral wall continuously extends along the peripheral edge of the groove bottom wall in a ring shape, and the groove peripheral wall is connected with the peripheral edge of the groove bottom wall. Here, the ring shape can be a circular ring shape, a square ring shape, etc.

[0095] In the embodiment in which the cover 32 is multiple, one of the covers 32 can be provided with the recess 321, or all of the covers 32 can be provided with the recess 321. For example, in some specific embodiments, as shown in Figures 3-5 The electric connecting portion 50 includes a positive electrode connecting portion 52 and a negative electrode connecting portion 53, and the positive electrode connecting portion 52 and the negative electrode connecting portion 53 are arranged on the groove bottom wall of the recess 321 of the cover 32. For another example, in some other specific embodiments, the cover 32 is two and covers the two ends of the shell body 31 in the first direction F1, respectively, and the electric connecting portion 50 includes a positive electrode connecting portion 52 and a negative electrode connecting portion 53, and the positive electrode connecting portion 52 and the negative electrode connecting portion 53 are arranged on the groove bottom wall of the recess 321 of the two covers 32.

[0096] The electric connection part 50 can be directly connected with the electrode assembly 40, or indirectly connected with the electrode assembly 40 through a component such as a tab. The electric connection part 50 can realize the electric connection between the electrode assembly 40 and the outside, for example, the electric connection parts 50 of a plurality of battery monomers 20 can be connected in series, in parallel or in a mixed manner through the electric connector 60 such as a tab. The electric connection part 50 can be an integral piece arranged on the groove bottom wall of the groove 321, or can include a plurality of separate pieces, for example, including a pressing block and a pole, the pressing block is located outside the cover 32, the pole is arranged through the groove bottom wall of the groove 321, one end of the pole is electrically connected with the electrode assembly 40 and the other end is riveted with the pressing block, the pressing block can increase the area of the electric connection part 50, so as to increase the electric connection area with the electric connector 60 and the reliability of the connection with the cover 32.

[0097] The groove wall of the groove 321 is spaced apart from the periphery of the cover 32, that is, the groove 321 does not penetrate the cover 32 in any direction perpendicular to the depth direction of the groove 321, in other words, the periphery of the cover 32 is not formed with the slot of the groove 321. Therefore, the connection between the cover 32 and the shell body 31 is not affected by the arrangement of the groove 321, and the connection between the cover 32 and the shell body 31 can be located outside the groove wall of the groove 321, for example, by connecting the periphery of the cover 32 with the shell body 31.

[0098] Therefore, the connection between the cover 32 and the shell body 31 does not need to change with the shape of the groove 321, which is beneficial to make the connection coplanar, such as making the welding track of the cover 32 and the shell body 31 coplanar, without changing the track, reducing the difficulty of connecting the shell body 31 with the cover 32, reducing the processing difficulty of the shell 30, improving the processing rate of the shell 30, thereby facilitating the mass production of the shell 30.

[0099] The first connection part 61, the second connection part 62 and the third connection part 63 can be a block or a plate structure, and can be made of copper, aluminum or the like. In the first direction F1, the second connection part 62 can be partially located on the side of the first connection part 61 away from the electric connection part 50, or can be entirely located on the side of the first connection part 61 away from the electric connection part 50.

[0100] The first connection part 61, the second connection part 62 and the third connection part 63 are connected to form a bent structure of the electric connector 60, which is convenient for electrically connecting the first connection part 61 with the electric connection part 50, and enables the second connection part 62 to avoid the area of the cover 32 where the groove 321 is not arranged, so that the electric connector 60 and the cover 32 are not easily interfered.

[0101] For example Figure 5 And Figure 6As shown, the electrical connecting piece 60 is a bent structure and includes two first connecting portions 61, one second connecting portion 62 and two third connecting portions 63, the two first connecting portions 61 are respectively connected to the positive connecting portion 52 and the negative connecting portion 53 of the adjacent two battery monomers 20, and the two third connecting portions 63 are respectively connected to two ends of the second connecting portion 62 and the two first connecting portions 61. In the second direction F2, the length of the second connecting portion 62 is greater than the interval of the grooves 321 of the adjacent two battery monomers 20; in the first direction F1, the second connecting portion 62 is above the part of the cover body 32 between the grooves 321 of the adjacent two battery monomers 20 to avoid the area where the cover body 32 is not provided with the groove 321. Among them, the second connecting portion 62 can be attached to the area where the cover body 32 is not provided with the groove 321 or can be spaced apart.

[0102] According to the battery device 1000 of the embodiment of the utility model, by making the groove wall of the groove 321 on the cover body 32 spaced apart from the circumferential edge of the cover body 32 and making the electrical connecting portion 50 arranged on the groove bottom wall of the groove 321, the connection track of the cover body 32 and the shell body 31 is not interfered by the groove 321, which is beneficial to make the connection track structure simpler, thereby reducing the connection difficulty, reducing the processing difficulty of the shell 30, improving the processing rate and being beneficial to realize mass production of the shell 30. The electrical connecting piece 60 is formed as a bent structure, which is convenient for the electrical connection between the first connecting portion 61 and the electrical connecting portion 50, and makes the second connecting portion 62 avoid the area where the cover body 32 is not provided with the groove 321, so that the electrical connecting piece 60 and the cover body 32 are not easy to form position interference.

[0103] In some embodiments, as shown in Figure 3 As shown, the groove 321 is recessed along the first direction F1, and the projection of the groove 321 and the electrode assembly 40 at least partially overlaps in at least one direction perpendicular to the first direction F1.

[0104] The groove 321 is recessed along the first direction F1, that is, the depth direction of the groove 321 is the first direction F1. The at least one direction perpendicular to the first direction F1 can be Figure 3 As shown, the second direction F2, the third direction F3 or other directions intersecting the second direction F2 and the third direction F3. The projection of the groove 321 and the electrode assembly 40 refers to the projection in the same direction on the same surface; at least partially overlapping projections make the groove 321 and the electrode assembly 40 can at least partially share space in the first direction F1, thereby the electrode assembly 40 can fully utilize the space of at least one side of the groove 321 perpendicular to the first direction F1, thereby improving the space utilization rate of the accommodating cavity 311 and improving the performance of the battery monomer 20.

[0105] The electrode assembly 40 can include an electrode body and a tab 41 provided on the electrode body, and the tab 41 is used to be electrically connected with the electrical connection part 50. In some embodiments, the tab 41 is arranged perpendicularly to the first direction F1 with the recess 321, and the projection of the tab 41 at least partially overlaps the projection of the recess 321, so that the tab 41 shares the space in the first direction F1 with the recess 321; in other embodiments, a part of the electrode body is located on one side of the recess 321 along the first direction F1, and another part is located on the side of the recess 321 perpendicular to the first direction F1, so that the other part of the electrode body partially overlaps the projection of the recess 321, and shares the space in the first direction F1, which can improve the space utilization.

[0106] According to some embodiments of the present application, as shown in Figure 3 The part of the electrical connection part 50 located outside the shell 30 is a first part 51, and the first part 51 is located in the recess 321.

[0107] In other words, the part of the electrical connection part 50 located outside the shell 30 is completely located in the recess 321, without occupying the space outside the recess 321. The arrangement of the electrical connection part 50 does not increase the overall occupied space of the battery monomer 20 in the depth direction of the recess 321 (hereinafter referred to as the first direction F1), which is beneficial to make the structure of the battery monomer 20 more compact.

[0108] In some embodiments, the distance between the end surface of the first part 51 facing away from the bottom wall of the recess 321 and the opening of the recess 321 is 0mm-5mm.

[0109] In the embodiment with a distance of 0mm, the end surface of the first part 51 facing away from the bottom wall of the recess 321 is coplanar with the opening of the recess 321; in the embodiment with a distance greater than 0mm and less than or equal to 5mm, the first part 51 is completely located in the recess 321 and is spaced apart from the opening of the recess 321 by a distance, so that the electrical connection part 60 can be connected with the first part 51, and the electrical connection part 60 can be partially located in the recess 321, so as to further reduce the overall occupied space of the battery monomer assembly 100 including the battery monomer 20 in the first direction F1. For example, in some specific embodiments, the distance between the end surface of the first part 51 facing away from the bottom wall of the recess 321 and the opening of the recess 321 is 0mm, 1mm, 2mm, 3mm, 4mm and 5mm, etc.

[0110] According to some embodiments of the present application, the part of the electrical connection portion 50 outside the housing 30 includes a first part 51 and a second part, wherein the first part 51 is located inside the groove 321, and the second part is located outside the groove 321. The height of the second part beyond the groove 321 is less than or equal to 1mm. In other words, the part of the electrical connection portion 50 outside the housing 30 is partially located inside the groove 321 and partially located outside the groove 321, and the height of the part located outside the groove 321 in the first direction F1 is not more than 1mm.

[0111] The second part located outside the groove 321 can be used for electrical connection with the electrical connector 60, so that the structure of the electrical connector 60 is not affected by the groove 321. For example, the electrical connector 60 can be a flat tab, which is beneficial to make the structure of the electrical connector 60 simpler, reduce the cost and facilitate connection. In addition, the height of the electrical connection portion 50 beyond the groove 321 is small, which is beneficial to reduce the occupied space of the battery cell assembly 100 including the battery cell 20 and the electrical connector 60 in the first direction F1. For example, in some specific embodiments, the height of the second part beyond the groove 321 can be 1mm, 0.8mm, 0.6mm, 0.4mm and 0.2mm, etc.

[0112] In some embodiments of the present application, as shown in Figures 3-5 The electrical connection portion 50 includes a positive electrode connection portion 52 and a negative electrode connection portion 53, and the parts of the positive electrode connection portion 52 and the negative electrode connection portion 53 outside the housing 30 are located in the same groove 321. In other words, the positive electrode connection portion 52 and the negative electrode connection portion 53 are arranged on the groove bottom wall of the same groove 321.

[0113] Therefore, only one groove 321 needs to be arranged on the cover body 32, which is beneficial to simplify the structure of the cover body 32 and facilitate processing. In addition, the positive electrode connection portion 52 and the negative electrode connection portion 53 can be located on the same side of the housing 30, so that the electrical connection structure such as the electrical connector 60 of the battery cell assembly 100 can be located on the same side, and the space arrangement is more reasonable.

[0114] According to some embodiments of the present application, as shown in Figure 3 and Figure 7As shown, the battery cell assemblies 100 are multiple, and at least two battery cell assemblies 100 are arranged in a stacked manner along the first direction F1. The other end of the shell body 31 in the first direction F1 is an end wall 313 opposite to the end opening 312, and the end wall 313 is provided with a relief groove 314. In two adjacent battery cell assemblies 100 in the first direction F1, the electrical connection part 50 of one battery cell assembly 100 is at least partially located in the relief groove 314 of the other battery cell assembly 100; or the electrical connecting piece 60 connected with the electrical connection part 50 of one battery cell assembly 100 is at least partially located in the relief groove 314 of the other battery cell assembly 100; or the electrical connection part 50 of one battery cell assembly 100 is at least partially located in the relief groove 314 of the other battery cell assembly 100, and the electrical connecting piece 60 connected with the electrical connection part 50 of one battery cell assembly 100 is at least partially located in the relief groove 314 of the other battery cell assembly 100.

[0115] In other words, the part of the electrical connection part 50 and the electrical connecting piece 60 that exceeds the slot opening of the groove 321 can be accommodated in the relief groove 314, so that the shells 30 of the two battery cell assemblies 100 can be closely attached without interference, which is beneficial to improve the overall assembly rigidity.

[0116] The setting position and shape of the relief groove 314 on the end wall 313 can be flexibly set according to the position and structure of the part of the electrical connection part 50 and the electrical connecting piece 60 that exceeds the slot opening of the groove 321. For example, in some specific embodiments, the first connecting part 61 of the electrical connection part 50 and the electrical connecting piece 60 is located in the groove 321, and the second connecting part 62 of the electrical connecting piece 60 is located outside the groove 321, i.e., the second connecting part 62 exceeds the slot opening of the groove 321, and the relief groove 314 can be arranged opposite to the second connecting part 62 to avoid the second connecting part 62, so as to reduce the slotting area on the end wall 313 and improve the structural strength of the end wall 313.

[0117] For another example, in some other specific embodiments, as shown in Figure 7 The relief groove 314 penetrates the end wall 313 along the second direction F2. The structure of the relief groove 314 is simpler, and the relief groove 314 can avoid different structures of the electrical connection part 50 and the electrical connecting piece 60, which has stronger universality and is beneficial to reduce the production cost and difficulty.

[0118] According to some embodiments of the present application, as shown in Figure 3 and Figure 4 The shell body 31 is provided with a pressure relief part 70 on at least one side in the third direction F3, and the first direction F1, the second direction F2 and the third direction F3 intersect with each other.

[0119] When the internal pressure of the battery cell 20 is too high (e.g. thermal runaway), the pressure relief portion 70 is used to release the internal substances (e.g. gas, liquid, particulate matter, etc.) of the battery cell 20 to reduce the internal pressure of the battery cell 20, avoiding the risk of explosion of the battery cell 20 due to the rapid pressurization of the internal of the battery cell 20. For example, the pressure relief portion 70 can be a pressure relief valve, a pressure relief disc, etc.

[0120] In the application of the battery cell 20, such as in the battery device 1000, no exhaust space is required on both sides in the first direction F1, improving the space utilization of the battery device 1000 in the first direction F1, and facilitating the direct stacking of multiple battery cells 20 in the first direction F1, such as the direct abutment of the housings 30 of adjacent battery cells 20 to improve the overall structural rigidity. Moreover, the orientation of the pressure relief portion 70 is different from the arrangement direction of the multiple battery cells 20, and will not be directed towards the adjacent battery cell 20 of the same battery cell assembly 100, so that the adjacent battery cell 20 is less likely to have thermal runaway due to excessive temperature.

[0121] In the embodiment where the battery device 1000 includes one battery cell assembly 100, the pressure relief portion 70 can be arranged on one side or both sides of the battery cell assembly 100 in the third direction F3. In the embodiment where the battery device 1000 includes multiple battery cell assemblies 100 and at least two battery cell assemblies 100 are arranged in the third direction F3, the pressure relief portions 70 of the adjacent two battery cell assemblies 100 can be arranged on opposite sides in the third direction F3, or an exhaust passage can be arranged between the adjacent two battery cell assemblies 100, and the pressure relief portions 70 of the two battery cell assemblies 100 can be arranged towards the exhaust passage, i.e. the pressure relief portions 70 are arranged on the opposite sides of the adjacent two battery cell assemblies 100.

[0122] In some embodiments of the present application, as shown in Figures 3-5 The electrical connection portion 50 includes a positive electrode connection portion 52 and a negative electrode connection portion 53, and the projections of the portions of the positive electrode connection portion 52 and the negative electrode connection portion 53 located outside the housing 30 at least partially overlap in the second direction F2.

[0123] In other words, the positive electrode connection portion 52 and the negative electrode connection portion 53 are arranged at least partially in the stacking direction of the multiple battery cells 20. In this way, the electrical connections 60 between the multiple battery cells 20 can be electrically connected in the second direction F2, and the multiple electrical connections 60 can be arranged in the second direction F2, reducing the occupied space of the electrical connection structure in the third direction F3, making the structure more compact, and reducing the positional interference between the multiple electrical connections 60.

[0124] As shown in Figure 8As shown, according to the energy storage device 2 of the second aspect of the utility model, including the battery device 1000 according to the first aspect of the utility model, the battery device 1000 is used to store or provide electric energy. Thus, by using the above-mentioned battery device 1000, the connection track of the cover body 32 and the shell body 31 is not interfered by the groove 321, which is beneficial to make the connection track structure simpler, thereby reducing the connection difficulty, reducing the processing difficulty of the shell 30, improving the processing rate and being beneficial to realize mass production of the shell 30.

[0125] As shown, Figure 1 As shown, according to the electric device of the third aspect of the utility model, including the battery device 1000 according to the first aspect of the utility model or the energy storage device 2 of the second aspect of the utility model, the battery device 1000 is used to store or provide electric energy. Thus, by using the above-mentioned battery device 1000 or energy storage device 2, the connection track of the cover body 32 and the shell body 31 is not interfered by the groove 321, which is beneficial to make the connection track structure simpler, thereby reducing the connection difficulty, reducing the processing difficulty of the shell 30, improving the processing rate and being beneficial to realize mass production of the shell 30.

[0126] The battery device 1000 and the vehicle 1 having the same according to some embodiments of the utility model will be described below in conjunction with the drawings.

[0127] As shown, Figure 1 And Figure 2 As shown, the vehicle 1 includes the battery device 1000, and the battery device 1000 according to the first embodiment of the utility model includes the box body 10 and one battery monomer assembly 100 arranged in the box body 10, and the battery monomer assembly 100 includes a plurality of battery monomers 20 arranged in a second direction F2.

[0128] As shown, Figures 3-6 As shown, the battery monomer 20 includes the shell 30 and the electrode assembly 40 arranged in the shell 30, and the shell 30 includes the shell body 31 and the cover body 32 arranged above the shell body 31. The upper surface of the cover body 32 is provided with a downwardly recessed groove 321, and the periphery of the groove 321 is spaced apart from the periphery of the cover body 32. The periphery of the cover body 32 is welded to the shell body 31, so that the welding track of the cover body 32 and the shell body 31 is coplanar, thereby improving the welding rate and facilitating mass production.

[0129] The positive electrode connecting part 52 and the negative electrode connecting part 53 are arranged in the groove bottom wall of the groove 321 and are connected with the positive electrode tab 41 and the negative electrode tab 41 of the electrode assembly 40 respectively. The positive electrode tab 41 and the negative electrode tab 41 are respectively located on both sides of the groove 321 in the third direction F3 and share the space with the groove 321 in the first direction F1, thereby improving the space utilization rate in the shell 30.

[0130] Two adjacent battery monomers 20 are connected in series by the electrical connector 60, the electrical connector 60 is bent and extended to form a three-dimensional bar, the second connecting part 62 in the middle of the electrical connector 60 is located higher, which can avoid the area where the cover body 32 is not provided with the groove 321, and avoid the welding seam between the cover body 32 and the shell body 31; the first connecting part 61 at both ends of the electrical connector 60 is located lower, which can be in surface-to-surface contact with the positive connecting part 52 or the negative connecting part 53 in the groove 321. The pressure relief part 70 is arranged on one side of the battery monomer 20 in the third direction F3, so that the top of the battery monomer 20 does not need to reserve an exhaust space, and the space utilization rate of the battery monomer 20 in the first direction F1 in the box body 10 is improved.

[0131] As shown in Figure 7 The battery device 1000 according to the second embodiment of the present application is different from the battery device 1000 of the first embodiment in that it comprises two battery monomer assemblies 100, and the two battery monomer assemblies 100 are arranged in a stack along the first direction F1. The bottom of the shell body 31 is provided with an avoiding groove 314, and the electrical connector 60 of the lower battery monomer assembly 100 is located in the avoiding groove 314 of the upper battery monomer assembly 100, so that the shells 30 of the upper and lower battery monomer assemblies 100 can be closely attached, thereby improving the overall assembly stiffness. The pressure relief part 70 is arranged on one side of the battery monomer 20 in the third direction F3, which not only improves the space utilization rate of the battery monomer 20 in the first direction F1 in the box body 10, but also enables the two layers of battery monomer assemblies 100 to be directly stacked, and the overall stiffness is higher.

[0132] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0133] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that, It includes a battery cell assembly, wherein the battery cell assembly includes multiple battery cells. The battery cell includes a housing and an electrical connection portion. The housing includes a housing body and a cover. The housing body defines a receiving cavity for accommodating an electrode assembly. The receiving cavity has an end opening at at least one end in a first direction. The cover is disposed on the end opening and connected to the housing body. The cover has a groove. The groove's peripheral wall is spaced apart from the periphery of the cover. The electrical connection portion is disposed on the bottom wall of the groove and is electrically connected to the electrode assembly. Multiple battery cells are arranged along a second direction and electrically connected by an electrical connector. The second direction intersects the first direction. The electrical connector includes a first connecting portion, a second connecting portion, and a third connecting portion. The first connecting portion is electrically connected to the electrical connecting portion of the battery cell. The second connecting portion is located outside the groove and on the side of the first connecting portion away from the electrical connecting portion in the first direction. The third connecting portion connects the first connecting portion and the second connecting portion.

2. The battery device as claimed in claim 1, characterized in that, The groove is recessed along a first direction, and in at least one direction perpendicular to the first direction, the projections of the groove and the electrode assembly at least partially overlap.

3. The battery device as claimed in claim 1, characterized in that, The electrical connection portion is located outside the housing and is divided into a first part, which is located within the groove.

4. The battery device as claimed in claim 3, characterized in that, The distance between the end face of the first part facing away from the bottom wall of the groove and the groove opening is 0mm to 5mm.

5. The battery device as claimed in claim 1, characterized in that, The portion of the electrical connection located outside the housing includes a first portion and a second portion. The first portion is located inside the groove, and the second portion is located outside the groove. The height of the second portion extending beyond the groove opening is less than or equal to 1 mm.

6. The battery device as claimed in claim 1, characterized in that, The electrical connection portion includes a positive electrode connection portion and a negative electrode connection portion, and the portions of the positive electrode connection portion and the negative electrode connection portion located outside the housing are located in the same groove.

7. The battery device as claimed in claim 1, characterized in that, The battery cell assembly is multiple, with at least two battery cell assemblies stacked along the first direction. The other end of the shell body in the first direction is an end wall opposite to the end opening, and the end wall is provided with a clearance groove. In two adjacent battery cell assemblies, the electrical connection portion and / or the connected electrical connector of one battery cell assembly are at least partially located within the clearance groove of the other battery cell assembly.

8. The battery device as claimed in claim 7, characterized in that, The clearance groove penetrates the end wall along the second direction.

9. The battery device as claimed in claim 1, characterized in that, The shell body has a pressure relief section on at least one side in the third direction, and the first direction, the second direction and the third direction intersect each other.

10. The battery device as claimed in claim 1, characterized in that, The electrical connection portion includes a positive connection portion and a negative connection portion, and the projections of the positive connection portion and the negative connection portion located outside the housing along the second direction at least partially overlap.

11. An energy storage device, characterized in that, Includes a battery device as described in any one of claims 1-10, the battery device being used to store or provide electrical energy.

12. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-10 or an energy storage device as described in claim 11, wherein the battery device is used to store or provide electrical energy.

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