Battery device and electric equipment

Abstract

The embodiment of the utility model discloses a battery device and electric equipment. The battery device includes: a plurality of battery cell assemblies connected in series, a first battery cell assembly of the plurality of battery cell assemblies including a plurality of battery cells connected in parallel, each battery cell of the plurality of battery cell assemblies including a first electrode; the confluence component is used for realizing electric connection between a first battery monomer and a second battery monomer in the plurality of battery monomers, the confluence component comprises two first connecting parts and a current limiting part, and the current limiting part is positioned between the two first connecting parts along the length direction of the confluence component; the two first connecting parts are respectively used for connecting the first electrode of the first battery monomer and the first electrode of the second battery monomer; according to the battery device and the electric equipment provided by the embodiment of the invention, the reliability of the battery device can be improved.

Description

[0001] This application claims priority to PCT patent application PCT / CN2024 / 129116 entitled "Battery Device and Electrical Equipment" filed on October 31, 2024, and PCT / CN2024 / 129130 entitled "Battery Device and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of batteries, and more specifically, to a battery device and an electrical appliance. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0004] To increase the capacity of a battery device, multiple battery cells can be electrically connected in a parallel configuration. However, if any one of these cells experiences thermal runaway, the short-circuit current will generate a large amount of heat, leading to heat dissipation between the parallel-connected cells and posing a safety hazard. Utility Model Content

[0005] This application provides a battery device and an electrical appliance that can improve the reliability of the battery device.

[0006] In a first aspect, a battery device is provided, comprising: a plurality of battery cell assemblies connected in series, wherein a first battery cell assembly comprises a plurality of battery cells connected in parallel, and each battery cell in the plurality of battery cell assemblies comprises a first electrode; and a busbar component for electrically connecting the first battery cell and a second battery cell in the plurality of battery cells, the busbar component comprising two first connecting portions and a current limiting portion, wherein the current limiting portion is located between the two first connecting portions along the length direction of the busbar component, and the two first connecting portions are respectively used to connect the first electrode of the first battery cell and the first electrode of the second battery cell.

[0007] Therefore, the battery device of this application embodiment, by providing a current limiting section on the busbar component, in the event of thermal runaway of the first or second battery cell, even if the thermally runaway battery cell itself is approximately short-circuited, equivalent to a resistor with a very small resistance, the current limiting section on the busbar component used to realize the parallel connection of the first and second battery cells can limit the current in the circuit between the first and second battery cells from being too large, reducing the risk of short circuit, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device.

[0008] In some embodiments, the cross-sectional area of ​​the current-limiting portion is smaller than the cross-sectional area of ​​each of the two first connecting portions, and both the cross-section of the current-limiting portion and the cross-section of each of the first connecting portions are perpendicular to the length direction of the busbar component. Because the cross-sectional area of ​​the current-limiting portion is smaller, while the cross-sectional areas of the two first connecting portions are larger, the resistance of the current-limiting portion is larger, which can limit the overcurrent capacity of the current-limiting portion, i.e., limit the magnitude of the current. Especially in the event of thermal runaway of the first or second battery cell, it can limit the current in the circuit between the first and second battery cells from becoming excessive, reducing the risk of short circuits, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device.

[0009] In some embodiments, along the width direction of the confluence component, the width of the current limiting portion is smaller than the width of each of the first connecting portions, so that the cross-sectional area of ​​the current limiting portion is smaller than the cross-sectional area of ​​each of the two first connecting portions.

[0010] In some embodiments, the thickness of the current-limiting portion is equal to the thickness of each first connection portion along the thickness direction of the current-limiting component, so that different areas of the surface of the current-limiting component are relatively flat, which facilitates connection with the first electrode of the first battery cell and the first electrode of the second battery cell, so as to facilitate the assembly of the battery device.

[0011] In some embodiments, the current-limiting part is used to melt and disconnect the electrical connection between the two first connecting parts when the first battery cell and / or the second battery cell experiences thermal runaway. By reasonably setting the cross-sectional area of ​​the current-limiting part, it is possible to melt and disconnect the electrical connection between the two first connecting parts, further disconnecting the parallel connection between the first battery cell and the second battery cell, effectively reducing the risk of short circuit, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device.

[0012] In some embodiments, the current limiting part includes a current limiting element, which increases the resistance between the first battery cell and the second battery cell to limit the current in the circuit between the first battery cell and the second battery cell from becoming too large in the event of thermal runaway of the first battery cell or the second battery cell, thereby reducing the risk of short circuit, reducing the risk of thermal diffusion, and improving the reliability of the battery device.

[0013] In some embodiments, the current-limiting element includes a resistor and / or a capacitor to facilitate fabrication.

[0014] In some embodiments, the material of the current-limiting element is different from the material of the two first connecting parts. By using different materials, the resistance of the current-limiting part can be increased to achieve current limiting.

[0015] In some embodiments, the material of the current-limiting element includes at least one of ceramic, polycarbonate, polyethylene, polypropylene and nylon, which is both easy to process and allows for cost control.

[0016] In some embodiments, the busbar includes a plurality of first connecting portions arranged along the length of the busbar, each of the plurality of first connecting portions corresponding one-to-one with a plurality of battery cells. Each of the plurality of first connecting portions is used to connect to the first electrode of a corresponding battery cell among the plurality of battery cells. The plurality of first connecting portions includes two first connecting portions. In this way, parallel connection between multiple battery cells in a battery cell assembly can be achieved through a single busbar, simplifying the number and structure of busbars and facilitating connection.

[0017] In some embodiments, each battery cell in the plurality of battery cell assemblies further includes a second electrode with the opposite polarity to the first electrode. The plurality of battery cell assemblies also include a second battery cell assembly adjacent to the first battery cell assembly. The busbar component further includes a plurality of second connecting portions, which correspond one-to-one with and are interconnected with the plurality of first connecting portions. Each of the plurality of second connecting portions is used for electrical connection with the second electrode of the corresponding battery cell in the second battery cell assembly. By providing the busbar component with first and second connecting portions, both parallel connections between multiple battery cells and series connections between multiple battery cell assemblies can be achieved, simplifying the number and structure of busbar components within the battery device and improving the assembly efficiency and space utilization of the battery device.

[0018] In some embodiments, each battery cell in the plurality of battery cell assemblies includes: a housing, the housing including a first wall; an electrode terminal disposed on the first wall, the electrode terminal being electrically insulated from the first wall; and an electrode assembly housed within the housing, the electrode assembly having a first tab electrically connected to the electrode terminal and a second tab electrically connected to the first wall, the second tab having opposite polarity to the first tab, wherein the first electrode is either the electrode terminal or the first wall. The electrode terminal and the first wall respectively serve as electrodes of the battery cell to output electrical energy. By using the first wall as an electrode to output electrical energy, the number of electrode terminals provided in the battery cell can be reduced, the structure can be simplified, and electrical connection between multiple battery cells can be facilitated.

[0019] In some embodiments, the housing includes: a shell, which is a hollow structure with an opening; and a cover plate for covering the opening, the cover plate including the first wall for ease of processing.

[0020] In a second aspect, an electrical device is provided, comprising: a battery device as described in the first aspect or any embodiment of the first aspect, the battery device being used to supply power to the electrical device.

[0021] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a vehicle according to one embodiment of this application;

[0023] Figure 2 This is an exploded view of a battery device according to an embodiment of this application;

[0024] Figure 3 This is a schematic diagram showing the connection relationship between individual battery cells within a battery device according to an embodiment of this application;

[0025] Figure 4 This is another schematic diagram illustrating the connection relationship between some individual battery cells within a battery device according to an embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the structure of a portion of the battery cells within a battery device according to an embodiment of this application;

[0027] Figure 6 This is a top view of some individual battery cells inside a battery device according to an embodiment of this application;

[0028] Figure 7 This is another top view of a portion of the battery cells within a battery device according to an embodiment of this application;

[0029] Figure 8This is a cross-sectional schematic diagram of some individual battery cells inside a battery device according to an embodiment of this application;

[0030] Figure 9 This is a schematic diagram of the structure of a portion of a battery cell within a battery device according to another embodiment of this application;

[0031] Figure 10 This is a top view of some individual battery cells within a battery device according to another embodiment of this application;

[0032] Figure 11 This is another top view of a portion of the battery cells within a battery device according to another embodiment of this application;

[0033] Figure 12 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0034] Figure 13 This is an exploded structural diagram of a battery cell according to an embodiment of this application.

[0035] The accompanying drawings are not drawn to scale.

[0036] Figure label:

[0037] 10-Battery assembly; 11-Casing; 111-First casing section; 112-Second casing section; 12-Current collector; 121-First connection section; 122-Second connection section; 123-Current limiting section; 20-Battery cell; 21-Casing; 211-Housing shell; 2111-Opening; 212-Cover plate; 213-First wall; 214-Electrode terminal; 215-First electrode; 216-Second electrode; 22-Electrode assembly; 221-Electrode body section; 222-Taper; 2221-First tab; 2222-Second tab; 201-First battery cell; 202-Second battery cell; 203-Third battery cell; 204-Fourth battery cell; 200-Battery cell assembly; 210-First battery cell assembly; 220-Second battery cell assembly; 30-Controller; 40-Motor. Detailed Implementation

[0038] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0041] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0045] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0046] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0047] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0048] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0049] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0050] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0051] The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. To increase the capacity of a battery device, multiple cells within the device can be electrically connected in a parallel configuration. However, in the event of thermal runaway in one of these parallel cells (which typically functions as a very small resistor), the cell approaches a short circuit. This increases the current flowing between the parallel cells, generating significant heat and potentially causing thermal diffusion between the cells, thus posing a safety hazard.

[0052] Therefore, embodiments of this application provide a battery device and an electrical appliance that can solve the above-mentioned problems. The battery device of this application includes multiple battery cell assemblies connected in series. A first battery cell assembly in this assembly includes multiple battery cells connected in parallel, and each battery cell in the assembly includes a first electrode. The battery device also includes a busbar, which is used to electrically connect the first battery cell and the second battery cell in the parallel battery cell assembly. The busbar includes two first connecting portions and a current-limiting portion. Along the length of the busbar, the current-limiting portion is located between the two first connecting portions. The two first connecting portions are respectively used to connect the first electrode of the first battery cell and the first electrode of the second battery cell. Thus, in the event of thermal runaway in the first or second battery cell, even if the thermally runaway battery cell is approximately short-circuited, equivalent to a resistor with a very small resistance, the current-limiting portion on the busbar for connecting the first and second battery cells in parallel can limit the current in the circuit between the first and second battery cells from becoming excessive, reducing the risk of short circuits, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device.

[0053] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0054] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. 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. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0055] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0056] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0057] Figure 2 An exploded view of a portion of the structure of the battery device 10 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The cylindrical shape shown, or it could be different. Figure 2 The embodiments shown are cuboids or other shapes, but are not limited to these.

[0058] It should be understood that, such as Figure 2 As shown, the battery device 10 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 20. The housing 11 of this embodiment has a hollow interior, and the multiple battery cells 20 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of the multiple battery cells 20 housed inside. At least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as... Figure 2As shown, only one of the first housing portion 111 and the second housing portion 112 can be a hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with one opening, and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the first housing portion 111 and the second housing portion 112 being fastened together.

[0059] For example, unlike Figure 2 As shown, the first box portion 111 and the second box portion 112 can both be hollow cuboids and each has one face as an opening. The openings of the first box portion 111 and the second box portion 112 are arranged opposite to each other, and the first box portion 111 and the second box portion 112 are interlocked to form a box 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0060] In some embodiments, the battery device 10 is typically an approximately cuboid structure. For example, embodiments of this application use... Figure 2 Taking the rectangular battery device 10 shown as an example; and, for ease of description, the following definitions are provided: Figure 2 The three mutually perpendicular directions shown are: the length direction X, the width direction Y, and the height direction Z of the battery device 10, wherein the dimension of the length direction X of the battery device 10 is greater than the dimension of the width direction Y.

[0061] Figure 3 This diagram illustrates the connection relationship between individual battery cells 20 within the battery device 10 according to an embodiment of this application. For example, Figure 3 It can be Figure 2 A schematic diagram showing the connection relationship between some of the battery cells 20 in the battery device 10. Figure 4 Another schematic diagram showing the connection relationship between the individual battery cells 20 within the battery device 10 according to an embodiment of this application is shown, for example, Figure 4 It can be Figure 3 The diagram shows a first battery cell assembly 210 of a plurality of battery cell assemblies 200 included in the battery device 10. Figure 5 This application shows a schematic diagram of the structure of a battery cell 20 within the battery device 10 according to an embodiment of the present application. For example, Figure 5 It can be Figure 2 A schematic diagram of the structure of a portion of the battery cells 20 in the battery device 10 shown. Figure 6 This paper shows a top view of a portion of the battery cells 20 within the battery device 10 according to an embodiment of this application. For example, Figure 6 It can be Figure 5The diagram shows a top view of a portion of the battery cell 20. Figure 7 Another top view schematic diagram of the battery cell 20 inside the battery device 10 according to an embodiment of this application is shown, for example, Figure 7 It can be Figure 6 A magnified view of region A in the middle.

[0062] The battery device 10 of this application embodiment may include a plurality of battery cell assemblies 200 connected in series and a busbar 12. Specifically, the first battery cell assembly 210 of the plurality of battery cell assemblies 200 includes a plurality of battery cells 20 connected in parallel, and each battery cell 20 in the plurality of battery cell assemblies 200 includes a first electrode 215; the busbar 12 is used to realize the electrical connection between the first battery cell 201 and the second battery cell 202 in the plurality of battery cells 20, and the busbar 12 includes two first connecting portions 121 and a current limiting portion 123. Along the length direction of the busbar 12, the current limiting portion 123 is located between the two first connecting portions 121, and the two first connecting portions 121 are respectively used to connect the first electrode 215 of the first battery cell 201 and the first electrode 215 of the second battery cell 202.

[0063] like Figures 3 to 7 As shown, the battery device 10 of this application embodiment includes a plurality of battery cell assemblies 200 connected in series. For example, in Figure 6 In the battery device 10, multiple battery cell assemblies 200 are arranged along the length direction X, with each row containing one battery cell assembly 200. Each battery cell assembly 200 may include one or more battery cells 20, and the number of battery cells 20 included in different battery cell assemblies 200 may be the same or different. For example, as... Figures 3 to 7 As shown, for ease of explanation, this application embodiment takes the example where the number of battery cells 20 in the plurality of battery cell assemblies 200 included in the battery device 10 is the same, but this application embodiment is not limited to this.

[0064] In some embodiments, the battery device 10 of this application includes a plurality of battery cell assemblies 200, each of which includes a plurality of battery cells 20 connected in parallel. The number of battery cells 20 connected in parallel in each battery cell assembly 200 can be set according to the actual application. Setting each battery cell assembly 200 to include two or more battery cells 20 connected in parallel can increase the capacity of the battery device 10; however, the parallel circuit is limited by the battery management system, charge / discharge control strategy, and safety factors, and the number of battery cells 20 connected in parallel in each battery cell assembly 200 should not be too large.

[0065] For ease of explanation, this application mainly uses the first battery cell assembly 210 among multiple battery cell assemblies 200 as an example. The first battery cell assembly 210 can be any one of the multiple battery cell assemblies 200, and it includes multiple battery cells 20 connected in parallel, for example... Figure 5 and Figure 6 Taking the first battery cell assembly 210, which includes six battery cells 20, as an example, the embodiments of this application are not limited to this.

[0066] The first battery cell assembly 210 of this application embodiment includes a plurality of battery cells 20, including a first battery cell 201 and a second battery cell 202. The first battery cell 201 and the second battery cell 202 can be any two battery cells 20 in the first battery cell assembly 210 connected in parallel via the busbar 12. For example, Figure 5 and Figure 6 Taking the middle battery cell 20 as an example, which is the first battery cell 201; and the second battery cell 202 is any one of the battery cells 20 in the first battery cell assembly 210 that is connected in parallel with the first battery cell 201 through the busbar 12, for example, Figure 5 and Figure 6 Taking the battery cell 20 to the right of the first battery cell 201 as the second battery cell 202 as an example, the embodiments of this application are not limited to this.

[0067] The busbar component 12 of this application embodiment can be used to realize the parallel connection of the first battery cell 201 and the second battery cell 202. Specifically, each battery cell 20 included in the battery device 10 of this application embodiment includes a first electrode 215. For example, the first electrode 215 can be the positive or negative electrode of the battery cell 20. The busbar component 12 includes two first connecting parts 121, which are respectively used to connect the first electrode 215 of the first battery cell 201 and the first electrode 215 of the second battery cell 202.

[0068] In some embodiments, if the first electrode 215 is a positive electrode, the two first connecting portions 121 of the busbar 12 are respectively used to connect the positive electrode of the first battery cell 201 and the positive electrode of the second battery cell 202, so that the first battery cell 201 and the second battery cell 202 are connected in parallel. As another example, if the first electrode 215 is a negative electrode, the two first connecting portions 121 of the busbar 12 are respectively used to connect the negative electrode of the first battery cell 201 and the negative electrode of the second battery cell 202, so that the first battery cell 201 and the second battery cell 202 are connected in parallel.

[0069] In this embodiment, the busbar component 12 further includes a current-limiting portion 123, which is located between the two first connecting portions 121 along the length of the busbar component 12. For example, as Figures 5 to 7 As shown, taking the length direction of the current-collecting component 12 as the width direction Y of the battery device 10 as an example, the two first connecting parts 121 and the current-limiting part 123 are arranged along the width direction Y of the battery device 10, and the current-limiting part 123 is located between the two first connecting parts 121.

[0070] It should be understood that the battery device 10 of this application embodiment may include a plurality of busbars 12 provided with the current limiting section 123. For example, for each pair of parallel battery cells 20 included in each battery cell assembly 200, the busbar 12 for connecting the positive terminals of the two battery cells 20 may be provided with the current limiting section 123, and / or, the busbar 12 for connecting the negative terminals of the two battery cells 20 may be provided with the current limiting section 123. In addition, in the battery device 10, all or part of the busbars 12 for connecting the positive terminals of the two parallel battery cells 20 may be provided with the current limiting section 123, and / or, all or part of the busbars 12 for connecting the negative terminals of the two parallel battery cells 20 may be provided with the current limiting section 123.

[0071] In the embodiments of this application, such as Figures 3 to 7 As shown, in the event of thermal runaway of the first battery cell 201 or the second battery cell 202, even if the thermally runaway battery cell 20 itself is approximately short-circuited, equivalent to a resistor with a very small resistance, the current limiting part 123 is provided on the bus component 12 used to realize the parallel connection of the first battery cell 201 and the second battery cell 202. This current limiting part 123 can limit the current in the circuit between the first battery cell 201 and the second battery cell 202 to be too large, reduce the risk of short circuit, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device 10.

[0072] It should be understood that the current limiting unit 123 in the embodiments of this application can be implemented in a variety of ways.

[0073] In some embodiments, the cross-sectional area of ​​the current-limiting portion 123 is smaller than the cross-sectional area of ​​each of the two first connecting portions 121, and the cross-sections of both the current-limiting portion 123 and each of the first connecting portions 121 are perpendicular to the length direction of the confluence member 12. For example... Figures 5 to 7As shown, since the cross-sectional area of ​​the current limiting part 123 is small, while the cross-sectional area of ​​the two first connecting parts 121 is large, the resistance of the current limiting part 123 is large, which can limit the overcurrent capacity of the current limiting part 123, that is, limit the magnitude of the current. Especially in the event of thermal runaway of the first battery cell 201 or the second battery cell 202, it can limit the current in the circuit between the first battery cell 201 and the second battery cell 202 to be too large, reduce the risk of short circuit, thereby reducing the risk of thermal diffusion and improving the reliability of the battery device 10.

[0074] It should be understood that the calculation method for the cross-sectional area of ​​the flow-limiting part 123 in this embodiment is related to the shape of the cross-section of the flow-limiting part 123; similarly, the calculation method for the cross-sectional area of ​​the two first connecting parts 121 is related to the shape of the cross-section of the first connecting parts 121. For example, taking a roughly plate-shaped busbar component 12 as an example, the cross-section of the flow-limiting part 123 and the cross-section of the two first connecting parts 121 are both approximately rectangular. Therefore, the cross-sectional area of ​​the flow-limiting part 123 is the product of the width and thickness of the flow-limiting part 123, and the cross-sectional area of ​​the two first connecting parts 121 is the product of the width and thickness of the first connecting parts 121.

[0075] Based on the calculation method of the cross-sectional area of ​​the flow limiting part 123 and the calculation method of the cross-sectional area of ​​the two first connecting parts 121, the cross-sectional area of ​​the flow limiting part 123 can be made smaller than the cross-sectional area of ​​each of the two first connecting parts 121 in a variety of ways.

[0076] In some embodiments, along the width direction of the merging component 12, the width W2 of the current limiting portion 123 is smaller than the width W1 of each first connecting portion 121, so that the cross-sectional area of ​​the current limiting portion 123 is smaller than the cross-sectional area of ​​each of the two first connecting portions 121.

[0077] In some embodiments, along the thickness direction of the busbar 12, the thickness of the current-limiting portion 123 is equal to the thickness of each first connecting portion 121. For example, Figure 8 A cross-sectional schematic diagram of a partial structure of the battery device 10 according to an embodiment of this application is shown, for example, Figure 8 It can be along Figure 6 The cross-sectional view along the B-B' direction shown is... Figure 8 A cross-sectional schematic diagram of the first battery cell assembly 210 and the corresponding busbar component 12 is shown. Figure 8As shown, the thickness of the current limiting part 123 and the thickness of each first connecting part 121 are both T, so that different areas of the surface of the current converging component 12 are relatively flat, which facilitates the connection with the first electrode 215 of the first battery cell 201 and the first electrode 215 of the second battery cell 202, so as to facilitate the assembly of the battery device 10.

[0078] like Figures 5 to 8 As shown, the cross-section of the flow-limiting part 123 is approximately rectangular, and the area of ​​the cross-section of the flow-limiting part 123 is the product of the width W2 and the thickness T of the flow-limiting part 123. The cross-section of each first connecting part 121 is also approximately rectangular, and the area of ​​the cross-section of each first connecting part 121 is the product of the width W1 and the thickness T of the first connecting part 121.

[0079] In some embodiments, the current limiting part 123 is used to melt and disconnect the electrical connection between the two first connecting parts 121 when the first battery cell 201 and / or the second battery cell 202 experience thermal runaway. In the event of thermal runaway in the first battery cell 201 or the second battery cell 202, the cross-sectional area of ​​the current limiting part 123 is small, its current-carrying capacity is weak, and heat is concentrated. Therefore, by reasonably setting the cross-sectional area of ​​the current limiting part 123, it can melt and disconnect the electrical connection between the two first connecting parts 121, further disconnecting the parallel connection between the first battery cell 201 and the second battery cell 202, effectively reducing the risk of short circuit, thereby reducing the risk of heat diffusion and improving the reliability of the battery device 10.

[0080] In addition to setting the size of the current limiting part 123 to achieve the purpose of current limiting, the current limiting part 123 can also be set in other ways.

[0081] Figure 9 Another structural schematic diagram of the battery cell 20 within the battery device 10 according to an embodiment of this application is shown, for example, Figure 9 It can be Figure 2 A schematic diagram of another structure of a portion of the battery cell 20 in the battery device 10 shown. Figure 10 Another top view schematic diagram of the battery cell 20 inside the battery device 10 according to an embodiment of this application is shown, for example, Figure 10 It can be Figure 9 The diagram shows a top view of a portion of the battery cell 20. Figure 11 This paper shows another top view of the battery cell 20 inside the battery device 10 according to an embodiment of the present application. For example, Figure 11 It can be Figure 10 A magnified view of region C in the middle.

[0082] In some embodiments, the current limiting unit 123 includes a current limiting element, which increases the resistance between the first battery cell 201 and the second battery cell 202. In the event of thermal runaway of the first battery cell 201 or the second battery cell 202, the current in the circuit between the first battery cell 201 and the second battery cell 202 is limited to prevent it from becoming too large, thereby reducing the risk of short circuit and thus reducing the risk of thermal diffusion and improving the reliability of the battery device 10.

[0083] In some embodiments, the current-limiting element includes a resistor and / or a capacitor to facilitate fabrication. For example, the current-limiting element may typically be a resistor, i.e., an additional resistor is provided between the two first connection portions 121.

[0084] In some embodiments, the material of the current limiting element is different from the material of the two first connecting portions 121. By using different materials, the resistance of the current limiting portion 123 can be increased to achieve current limiting.

[0085] It should be understood that the material of the current-limiting element can be selected according to the actual application. For example, the material of the current-limiting element includes at least one of ceramic, polycarbonate (PC), polyethylene (PE), polypropylene (PP), and nylon, which is both easy to process and can control costs.

[0086] In some embodiments, the current limiting portion 123 and the two first connecting portions 121 can be an integral structure. For example, if the material of the current limiting element is plastic, the current limiting portion 123 and the two first connecting portions 121 can be integrally formed by injection molding; as another example, if the material of the current limiting element is ceramic, the current limiting portion 123 and the two first connecting portions 121 can be integrally formed by metallization technology. Alternatively, the current limiting portion 123 and the two first connecting portions 121 can also be separately provided, for example, the connection between the current limiting portion 123 and the two first connecting portions 121 can be achieved by welding or using connectors.

[0087] It should be understood that the busbar component 12 in this application embodiment can be used to realize the parallel connection between the first battery cell 201 and the second battery cell 202. Furthermore, the busbar component 12 can also be used to realize other connection relationships.

[0088] In some embodiments, the busbar component 12 includes a plurality of first connection portions 121 arranged along the length direction of the busbar component 12. Each of the plurality of first connection portions 121 corresponds one-to-one with a plurality of battery cells 20. Each of the plurality of first connection portions 121 is used to connect to the first electrode 215 of the corresponding battery cell 20. The plurality of first connection portions 121 may include two first connection portions 121. For example... Figures 5 to 11 As shown, the busbar component 12 includes a plurality of first connecting parts 121, and the plurality of first connecting parts 121 correspond one-to-one with the plurality of battery cells 20 in the first battery cell assembly 210. Parallel connection between the plurality of battery cells 20 in a battery cell assembly 200 can be achieved through one busbar component, which simplifies the number and structure of the busbar component 12 and facilitates connection.

[0089] It should be understood that among the multiple first connection portions 121 included in the current bus 12, a current limiting portion 123 can be provided between each two adjacent first connection portions 121, so that when any battery cell 20 in the first battery cell assembly 210 experiences thermal runaway, the current is limited by the current limiting portion 123 connected to the thermal runaway, thereby reducing the risk of short circuit, reducing the risk of thermal diffusion, and improving the reliability of the battery device 10.

[0090] In some embodiments, each battery cell 20 in the plurality of battery cell assemblies 200 further includes a second electrode 216 with the opposite polarity to the first electrode 215. The plurality of battery cell assemblies 200 also include a second battery cell assembly 220, which is adjacent to the first battery cell assembly 210. The busbar component 12 further includes a plurality of second connecting portions 122, which correspond one-to-one with and are interconnected with a plurality of first connecting portions 121. Each of the plurality of second connecting portions 122 is used to electrically connect to the second electrode 216 of the corresponding battery cell 20 in the second battery cell assembly 220. By setting the busbar component 12 to include the first connecting portions 121 and the second connecting portions 122, parallel connection between the plurality of battery cells 20 can be realized, as well as series connection between the plurality of battery cell assemblies 200. This simplifies the number and structure of the busbar components 12 provided in the battery device 10, and improves the assembly efficiency and space utilization of the battery device 10.

[0091] It should be understood that the second battery cell assembly 220 in this embodiment can be any one of a plurality of battery cell assemblies 200, and the second battery cell assembly 220 is adjacent to the first battery cell assembly 210, for example, as Figures 5 to 11 As shown, the second battery cell assembly 220 is an example of a battery cell assembly 200 that is adjacent to the first battery cell assembly 210 along the length direction X of the battery device 10.

[0092] Each battery cell 20 in the battery device 10 of this application embodiment also includes a second electrode 216 with the opposite polarity to the first electrode 215. For example, if the first electrode 215 is a positive electrode, then the second electrode is a negative electrode; if the first electrode 215 is a negative electrode, then the second electrode is a positive electrode.

[0093] In some embodiments, the busbar component 12 includes a plurality of second connection portions 122, each of which is used to electrically connect to the second electrode 216 of the corresponding battery cell 20 in the second battery cell assembly 220. Therefore, the busbar component 12 can realize the series connection between the first battery cell assembly 210 and the second battery cell assembly 220.

[0094] like Figures 5 to 11 As shown, taking the third battery cell 203 and the fourth battery cell 204 included in the second battery cell assembly 220 as an example, the busbar component 12 includes two first connecting parts 121, which are respectively used to connect the first electrode 215 of the first battery cell 201 and the first electrode 215 of the second battery cell 202, thereby realizing the parallel connection between the first battery cell 201 and the second battery cell 202; each of the two second connecting parts 122 included in the busbar component 12 is respectively used to connect to a corresponding first connecting part 121, thereby connecting the second electrode 216 of the third battery cell 203 through one second connecting part 122 to realize the series connection between the first battery cell 201 and the third battery cell 203, and connecting the second electrode 216 of the fourth battery cell 204 through the other second connecting part 122 to realize the series connection between the second battery cell 202 and the fourth battery cell 204.

[0095] The busbar component 12 in this embodiment may include a plurality of second connecting portions 122, each corresponding to a plurality of first connecting portions 121. Figures 5 to 11 As shown, the positions of the multiple second connecting portions 122 and the multiple first connecting portions 121 can be related to the arrangement of the battery cells 20 within the battery device 10. Taking the length direction of the busbar 12 as the width direction Y of the battery device 10 as an example, if the battery device 10 includes multiple parallel battery cells 20 along the width direction Y, then the multiple first connecting portions 121 of the busbar 12 can be distributed along the length direction of the busbar 12, and the multiple second connecting portions 122 can also be distributed along the length direction of the busbar 12. Taking the width direction of the busbar 12 as the length direction X of the battery device 10 as an example, if the battery device 10 includes multiple series battery cell assemblies 200 along the length direction X, then each second connecting portion 122 and its corresponding first connecting portion 121 can be distributed along the width direction of the busbar 12.

[0096] It should be understood that the battery cell 20 in this embodiment includes a first electrode 215, and may further include a second electrode 216. The first electrode 215 and the second electrode 216 have opposite polarities. The specific implementation of the first electrode 215 and the second electrode 216 can be set according to the actual application.

[0097] Figure 12A schematic diagram of the structure of the battery cell 20 according to an embodiment of this application is shown; Figure 13 An exploded view of a partial structure of the battery cell 20 according to an embodiment of this application is shown. Figure 13 It can be Figure 12 The diagram shows an exploded view of the battery cell 20. Wherein, Figure 12 and Figure 13 The battery cell 20 shown can be any one of the battery cells 20 included in the battery device 10 of this application embodiment.

[0098] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 20 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0099] In this embodiment, the battery cell 20 may include a housing 21. Specifically, the housing 21 may be a hollow polyhedral structure, and the housing 21 may include multiple walls.

[0100] In some embodiments, the outer casing 21 can be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing 21), or an aluminum-plastic film, etc. In some embodiments, the outer casing 21 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 21 is a non-sealed structure, the outer casing 21 serves to protect the electrode assembly 22, and a sealing bag is also included between the outer casing 21 and the electrode assembly 22. The sealing bag is used to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 21 is a sealed structure, it is used to encapsulate the electrode assembly 22 and the electrolyte, etc.

[0101] In this embodiment, the outer casing 21 includes a housing 211 and a cover plate 212, wherein the housing 211 is a hollow structure with an opening 2111; the cover plate 212 is used to cover the opening 2111 for sealing. Corresponding to different shapes of battery cells 20, the housing 211 of the battery cell 20 can be of various shapes, such as a cylinder or a polygonal prism. The housing 211 can be a hollow structure with an opening 2111 at one or more ends. For example, if the housing 211 is a hollow structure with openings 2111 at opposite ends, two cover plates 212 can be provided, with each cover plate 212 covering the openings at both ends of the housing 211; Figures 12 to 13 As shown, if the housing 211 is a hollow structure with an opening 2111 at one end, the cover plate 212 can be set as one.

[0102] It should be understood that the cover plate 212 in this embodiment is used to cover the opening 2111 of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the cover plate 212 can be adapted to the shape of the housing 211. For example, the housing 211 is a cuboid structure, and the cover plate 212 is a rectangular plate structure adapted to the housing 211; or, for example, ... Figures 12 to 13 As shown, the shell 211 is a cylindrical structure, and the cover plate 212 is a circular plate structure adapted to the shell 211.

[0103] In some embodiments, such as Figure 12 and Figure 13 As shown, the battery cell 20 further includes an electrode terminal 214, which is disposed on the first wall 213 and electrically insulated from the first wall 213. In this embodiment, the electrode terminal 214 is used to electrically connect with the electrode assembly 22 inside the battery cell 20 to output electrical energy from the battery cell 20. Furthermore, the battery cell 20 may include at least one electrode terminal 214, which includes at least one positive electrode terminal and / or at least one negative electrode terminal. If the battery cell 20 includes only at least one positive electrode terminal or only at least one negative electrode terminal, it can be electrically connected to the tab 222 of the electrode assembly 22 through the housing 21, allowing the housing 21 to output electrical energy in place of another electrode terminal with the opposite polarity.

[0104] In this embodiment, when the battery cell 20 includes multiple electrode terminals 214, these multiple electrode terminals 214 can be located on the same wall or different walls of the housing 21 to flexibly adapt to different application scenarios. For ease of explanation, this embodiment takes the electrode terminal 214 disposed on the first wall 213 of the battery cell 20 as an example, wherein the electrode terminal 214 can be a positive electrode terminal or a negative electrode terminal. The first wall 213 can be any wall included in the housing 21 of the battery cell 20.

[0105] For example, such as Figures 12 to 13 As shown, the cover plate 212 includes a first wall 213 to facilitate processing. Taking a cylindrical battery cell 20 as an example, the outer casing 21 may include three walls. Here, the first wall 213 is taken as the top wall of the cylinder, that is, the cover plate 212 is the top wall of the cylinder, but the embodiments of this application are not limited to this.

[0106] The battery cell 20 in this embodiment further includes an electrode assembly 22, which is housed within the casing 21. In this battery cell 20, the electrode assembly 22 is the component where the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the battery cell 20 can be one or multiple. The electrode assembly 22 can be a cylinder, a cuboid, etc. For example, if the electrode assembly 22 is a cylindrical structure, the casing 211 can also be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the casing 211 can also be a cuboid structure.

[0107] It should be understood that, such as Figures 12 to 13 As shown, the electrode assembly 22 in this embodiment may include tabs 222 and an electrode body 221. The tabs 222 of the electrode assembly 22 may include a positive tab and a negative tab. The positive tab may be formed by stacking portions of a positive electrode sheet that are not coated with a positive active material, and the negative tab may be formed by stacking portions of a negative electrode sheet that are not coated with a negative active material. The electrode body 221 may be formed by stacking or winding positive and negative electrode sheets together.

[0108] In this embodiment, the positive electrode terminal can be electrically connected to the positive electrode tab of the electrode assembly 22, and the negative electrode terminal can be electrically connected to the negative electrode tab of the electrode assembly 22. The positive electrode terminal and the positive electrode tab can be directly connected or indirectly connected, and the negative electrode terminal and the negative electrode tab can be directly connected or indirectly connected. For example, the positive electrode terminal can be electrically connected to the positive electrode tab via a connecting member, and the negative electrode terminal can be electrically connected to the negative electrode tab via a connecting member.

[0109] In some embodiments, if the battery cell 20 includes only a positive electrode terminal or only a negative electrode terminal, other components of the battery cell 20 can replace the electrode terminals to output electrical energy.

[0110] For example, the first tab 2221 of the electrode assembly 22 is electrically connected to the electrode terminal 214, and the second tab 2222 of the electrode assembly 22 is electrically connected to the first wall 213. The second tab 2222 has the opposite polarity to the first tab 2221. That is, the electrode terminal 214 and the first wall 213 serve as electrodes of the battery cell 20 to output electrical energy. By using the first wall 213 as an electrode to output electrical energy, the number of electrode terminals 214 provided in the battery cell 20 can be reduced, the structure can be simplified, and it is convenient to connect multiple battery cells 20 to each other.

[0111] It should be understood that the first tab 2221 and the second tab 2222 in this embodiment have opposite polarities. Specifically, if the first tab 2221 is a positive tab, then the second tab 2222 is a negative tab. Correspondingly, the electrode terminal 214 electrically connected to the first tab 2221 is the positive terminal of the battery cell 20, and the first wall 213 electrically connected to the second tab 2222 is the negative terminal of the battery cell 20. Alternatively, if the first tab 2221 is a negative tab, then the second tab 2222 is a positive tab. Correspondingly, the electrode terminal 214 electrically connected to the first tab 2221 is the negative terminal of the battery cell 20, and the first wall 213 electrically connected to the second tab 2222 is the positive terminal of the battery cell 20.

[0112] It should be understood that the positions of the first tab 2221 and the second tab 2222 in this embodiment can be configured according to actual applications. For example, the first tab 2221 and the second tab 2222 can be located on different end faces of the electrode assembly 22; for instance, the first tab 2221 and the second tab 2222 can be located on opposite end faces of the electrode assembly 22. Figure 12 and Figure 13 As shown, for the cylindrical electrode assembly 22, the first tab 2221 and the second tab 2222 can be located on two opposite top surfaces of the electrode assembly 22. Taking the first tab 2221 facing the first wall 213 as an example, the first tab 2221 is electrically connected to the electrode terminal 214 provided on the first wall 213. The second tab 2222 faces the bottom wall of the housing 211 and can be electrically connected to the housing 211, and is electrically connected to the cover plate 212 through the housing 211. That is, when the cover plate 212 includes the first wall 213, the second tab 2222 is electrically connected to the first wall 213.

[0113] In this embodiment, the first electrode 215 is either an electrode terminal 214 or a first wall 213. When the first electrode 215 is an electrode terminal 214, the second electrode 216 can be the first wall 213. The plurality of first connecting portions 121 of the busbar 12 can be used to connect the electrode terminals 214 of the plurality of battery cells 20, while the plurality of second connecting portions 122 of the busbar 12 are respectively used to connect the first walls 213 of the plurality of battery cells 20, so that the series and parallel connections between the battery cells 20 within the battery device 10 can be achieved through the busbar 12. When the first electrode 215 is the first wall 213, the second electrode 216 is an electrode terminal 214. The plurality of first connecting portions 121 of the busbar 12 can be used to connect the first walls 213 of the plurality of battery cells 20, while the plurality of second connecting portions 122 of the busbar 12 are respectively used to connect the electrode terminals 214 of the plurality of battery cells 20, so that the series and parallel connections between the battery cells 20 within the battery device 10 can be achieved through the busbar 12.

[0114] According to some embodiments of this application, this application also provides an electrical device including the battery device 10 described in any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device.

[0115] The electrical equipment can be any of the aforementioned devices or systems that use batteries.

[0116] According to some embodiments of this application, see Figures 5 to 11 This application provides a battery device 10, including: a plurality of battery cell assemblies 200 connected in series, a first battery cell assembly 210 of the plurality of battery cell assemblies 200 including a plurality of battery cells 20 connected in parallel, each battery cell 20 of the plurality of battery cell assemblies 200 including a first electrode 215; a busbar 12, the busbar 12 being used to realize the electrical connection between the first battery cell 201 and the second battery cell 202 of the plurality of battery cells 20, the busbar 12 including two first connecting parts 121 and a current limiting part 123, the current limiting part 123 being located between the two first connecting parts 121 along the length direction of the busbar 12, the two first connecting parts 121 being used to connect the first electrode 215 of the first battery cell 201 and the first electrode 215 of the second battery cell 202 respectively.

[0117] The cross-sectional area of ​​the current limiting part 123 is smaller than the cross-sectional area of ​​each of the two first connecting parts 121. The cross-section of the current limiting part 123 and the cross-section of each first connecting part 121 are perpendicular to the length direction of the busbar 12. The current limiting part 123 is used to melt and disconnect the electrical connection between the two first connecting parts 121 when thermal runaway occurs in the first battery cell 201 and / or the second battery cell 202.

[0118] The current limiting section 123 includes a current limiting element. The current limiting element includes a resistor and / or a capacitor. The material of the current limiting element is different from the material of the two first connection sections 121. The material of the current limiting element includes at least one of ceramic, polycarbonate, polyethylene, polypropylene, and nylon.

[0119] The busbar assembly 12 includes a plurality of first connecting portions 121 arranged along the length of the busbar assembly 12. Each of the plurality of first connecting portions 121 corresponds one-to-one with a plurality of battery cells 20. Each of the plurality of first connecting portions 121 is used to connect to the first electrode 215 of the corresponding battery cell 20. The plurality of first connecting portions 121 includes two first connecting portions 121. Each of the plurality of battery cell assemblies 200 also includes a second electrode 216 with the opposite polarity to the first electrode 215. The plurality of battery cell assemblies 200 also includes a second battery cell assembly 220, which is adjacent to the first battery cell assembly 210. The busbar assembly 12 also includes a plurality of second connecting portions 122, which correspond one-to-one with the plurality of first connecting portions 121 and are interconnected. Each of the plurality of second connecting portions 122 is used to electrically connect to the second electrode 216 of the corresponding battery cell 20 in the second battery cell assembly 220.

[0120] Each battery cell 20 in the plurality of battery cell assemblies 200 includes: a housing 21, the housing 21 including a first wall 213; an electrode terminal 214 disposed on the first wall 213, the electrode terminal 214 being electrically insulated from the first wall 213; an electrode assembly 22, the electrode assembly 22 being housed within the housing 21, the first tab 2221 of the electrode assembly 22 being electrically connected to the electrode terminal 214, the second tab 2222 of the electrode assembly 22 being electrically connected to the first wall 213, the second tab 2222 being opposite in polarity to the first tab 2221, wherein the first electrode 215 is either the electrode terminal 214 or the first wall 213.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A series of battery cell assemblies (200), wherein a first battery cell assembly (210) of the series of battery cell assemblies (200) includes a series of battery cells (20) connected in parallel, and each battery cell (20) of the series of battery cell assemblies (200) includes a first electrode (215). A busbar component (12) is used to realize the electrical connection between the first battery cell (201) and the second battery cell (202) in the plurality of battery cells (20). The busbar component (12) includes two first connecting parts (121) and a current limiting part (123). Along the length direction of the busbar component (12), the current limiting part (123) is located between the two first connecting parts (121). The two first connecting parts (121) are respectively used to connect the first electrode (215) of the first battery cell (201) and the first electrode (215) of the second battery cell (202).

2. The battery device according to claim 1, characterized in that, The cross-sectional area of ​​the flow limiting part (123) is smaller than the cross-sectional area of ​​each of the two first connecting parts (121). The cross-section of the flow limiting part (123) and the cross-section of each of the first connecting parts (121) are perpendicular to the length direction of the confluence component (12).

3. The battery device according to claim 2, characterized in that, Along the width direction of the busbar (12), the width of the flow limiting part (123) is smaller than the width of each of the first connecting parts (121).

4. The battery device according to claim 2, characterized in that, Along the thickness direction of the busbar (12), the thickness of the flow limiting part (123) is equal to the thickness of each of the first connecting parts (121).

5. The battery device according to claim 2, characterized in that, The current limiting part (123) is used to melt and disconnect the electrical connection between the two first connecting parts (121) when thermal runaway occurs in the first battery cell (201) and / or the second battery cell (202).

6. The battery device according to claim 1, characterized in that, The current limiting part (123) includes a current limiting element.

7. The battery device according to claim 6, characterized in that, The current-limiting element includes a resistor and / or a capacitor.

8. The battery device according to claim 6, characterized in that, The material of the current limiting element is different from the material of the two first connecting parts (121).

9. The battery device according to claim 8, characterized in that, The current-limiting element is made of ceramic or plastic.

10. The battery device according to any one of claims 1 to 9, characterized in that, The busbar component (12) includes a plurality of first connecting portions (121) arranged along the length direction of the busbar component (12). The plurality of first connecting portions (121) correspond one-to-one with the plurality of battery cells (20). Each of the plurality of first connecting portions (121) is used to connect to the first electrode (215) of the corresponding battery cell (20) in the plurality of battery cells (20). The plurality of first connecting portions (121) includes the two first connecting portions (121).

11. The battery device according to claim 10, characterized in that, Each of the plurality of battery cell assemblies (200) further includes a second electrode (216) with the opposite polarity to the first electrode (215), and the plurality of battery cell assemblies (200) further includes a second battery cell assembly (220) adjacent to the first battery cell assembly (210); The busbar component (12) further includes a plurality of second connecting parts (122), which correspond one-to-one with the plurality of first connecting parts (121) and are connected to each other. Each of the plurality of second connecting parts (122) is used to electrically connect to the second electrode (216) of the corresponding battery cell (20) in the second battery cell assembly (220).

12. The battery device according to any one of claims 1 to 9, characterized in that, Each of the plurality of battery cell assemblies (200) includes: The outer casing (21) includes a first wall (213); An electrode terminal (214) is disposed on the first wall (213), and the electrode terminal (214) is electrically insulated from the first wall (213); An electrode assembly (22) is housed within the housing (21). A first tab (2221) of the electrode assembly (22) is electrically connected to an electrode terminal (214). A second tab (2222) of the electrode assembly (22) is electrically connected to the first wall (213). The second tab (2222) has the opposite polarity to the first tab (2221). The first electrode (215) is either the electrode terminal (214) or the first wall (213).

13. The battery device according to claim 12, characterized in that, The outer casing (21) includes: The housing (211) is a hollow structure with an opening (2111); A cover plate (212) for covering the opening (2111), the cover plate (212) including the first wall (213).

14. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 13, wherein the battery device is used to supply power to the electrical device.

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