Battery device and electric device

Abstract

The utility model relates to the technical field of batteries and discloses a battery device and a power utilization device.The battery device comprises a battery pack, a confluence component and an isolation component, the battery pack comprises a plurality of soft package battery single bodies which are sequentially arranged in the first direction, each soft package battery single body comprises an electrode assembly and a packaging body, and the electrode assembly is provided with a tab; the electrode assembly is packaged in the packaging body, one part of the tab extends out of the interior of one end, in the second direction, of the packaging body, the confluence component is arranged on the side where the tab is located, at least part of the isolation component is arranged between the battery pack and the confluence component so as to separate the packaging body from the confluence component, and an avoiding opening is formed in the isolation component; tabs of the plurality of soft package battery monomers penetrate through the avoiding openings and are electrically connected with the confluence component, and the first direction is perpendicular to the second direction. Therefore, the risk that the packaging body of the soft package battery monomer is punctured by the burrs of the confluence component can be reduced, and the use reliability of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds, and battery devices, as the power source of electric vehicles, play an irreplaceable and important role. Among them, battery devices use battery cells to store and provide electrical energy, and among the many types of battery cells, soft-pack battery cells have been widely used due to their unique structure and advantages.

[0003] However, in the related art, the reliability of the battery device having the soft-pack battery cells needs to be further improved. Utility Model Content

[0004] The embodiments of the present application provide a battery device and an electrical device, which can reduce the risk of the packaging body of a soft-pack battery cell being punctured by the burrs of a busbar component, and are beneficial to improving the reliability of the battery device.

[0005] In a first aspect, an embodiment of the present application provides a battery device, comprising: a battery pack, comprising a plurality of soft-pack battery cells arranged in sequence along a first direction, each soft-pack battery cell comprising an electrode assembly and a packaging body, the electrode assembly being provided with a pole ear, the electrode assembly being encapsulated in the packaging body, a portion of the pole ear extending from the inside of one end of the packaging body in a second direction; a busbar component, arranged on the side where the pole ear is located; an isolation component, at least partially arranged between the battery pack and the busbar component to separate the packaging body from the busbar component, the isolation component being formed with an avoidance opening, the pole ears of the plurality of soft-pack battery cells passing through the avoidance opening and being electrically connected to the busbar component, the first direction and the second direction being perpendicular.

[0006] In the above technical scheme, the setting of the isolation component will not affect the electrical connection between the pole ear and the busbar component. At the same time, the isolation component can separate the packaging body and the busbar component. Due to the limitations of the manufacturing process of the busbar component, burrs are usually present on the busbar component. During the assembly of the battery pack with the busbar component, the isolation component can play an isolating role, separating the burrs on the busbar component from the packaging body of the soft-pack battery cell. Moreover, the distance between the battery pack and the busbar component in the second direction can also be improved due to the setting of the isolation component, so that the burrs on the busbar component are not easy to scratch the packaging body of the soft-pack battery cell, and the burrs on the busbar component are not easy to pierce the isolation component and scratch the packaging body of the soft-pack battery cell, thereby protecting the soft-pack battery cell and reducing the risk of the packaging body of the soft-pack battery cell being punctured and damaged, which is beneficial to improving the reliability of the use of the soft-pack battery cell. Moreover, the electrolyte of the soft-pack battery cell is not easy to leak from the packaging body, which is beneficial to improving the reliability of the battery device.

[0007] In some embodiments, at least one of the battery pack and the busbar member is fixed to the isolation member.

[0008] In the above technical solution, by fixing at least one of the battery pack and the busbar component to the isolation component, it is convenient to realize reliable setting of the isolation component, reduce the risk of movement of the isolation component, and facilitate to ensure that at least part of the isolation component is always arranged between the battery pack and the busbar component.

[0009] In some embodiments, the size of the battery pack in the second direction is larger than its size in the first direction and its size in the third direction, the first direction and the second direction are respectively perpendicular to the third direction, and with the second direction as the axial direction, the isolation component covers at least one side of the outer peripheral side of the battery pack; or, the isolation component covers at least one side of the outer peripheral side of the runner component.

[0010] In the above technical solution, by setting an isolation component to cover at least one side of the outer peripheral side of the battery pack, or to cover at least one side of the outer peripheral side of the runner component, while expanding the isolation range of the isolation component, it is convenient to improve the assembly convenience of the isolation component to a certain extent, and it is also beneficial to increase the matching area between the isolation component and the battery pack and / or the runner component, and improve the setting reliability of the isolation component.

[0011] In some embodiments, the isolation component includes a first isolation member and a second isolation member sequentially arranged along a first direction, the first isolation member and the second isolation member are both located between the battery pack and the busbar component, and the avoidance port is located between the first isolation member and the second isolation member.

[0012] In the above technical solution, the structure of the isolation component is simple, and since the first isolation component and the second isolation component are respectively located on the opposite sides of the avoidance opening in the first direction, when the battery pack is assembled with the convergence component, due to the isolation of the first isolation component and the second isolation component, it is convenient to keep a certain distance between the entire battery pack and the convergence component, and it is not easy for one end of the battery pack in the first direction to be scratched, which is beneficial to further reduce the probability of burrs on the convergence component scratching the soft-pack battery cell.

[0013] In some embodiments, the first isolating member and the second isolating member extend at least to both ends of the battery pack in the first direction, respectively. In the above technical solution, by providing the first isolating member and the second isolating member extending at least to both ends of the battery pack in the first direction, respectively, it is beneficial to improve the isolation range of the isolation component, improve the isolation effect of the isolation component, and further facilitate to keep a certain distance between the entire battery pack and the current collecting component, further reducing the probability of the battery pack being scratched by the current collecting component.

[0014] In some embodiments, in the first direction, the width of the first isolating member is x1, the width of the second isolating member is x2, x1≥5mm, x2≥5mm; and / or, the thickness of the portion of the isolating member disposed between the battery pack and the confluence member is t, 0.5mm≤t≤1.5mm. In the above technical solution, by setting the widths of the first isolating member and the second isolating member, it is beneficial to improve the isolation effect of the first isolating member and the second isolating member, and it is convenient to further reduce the probability of the package being scratched; by setting the thickness of the isolating member, it is convenient to separate the burrs of different sizes and structures on the confluence member from the package while taking into account the different assembly tolerances of the confluence member, and the isolating member will not occupy too much layout space, so as to take into account the energy density of the battery device.

[0015] In some embodiments, the isolation component also includes a third isolation member and a fourth isolation member arranged opposite to each other along the first direction, the third isolation member is bent and connected to one end of the first isolation member away from the second isolation member, the fourth isolation member is bent and connected to one end of the second isolation member away from the first isolation member, and the third isolation member and the fourth isolation member are respectively arranged on both sides of the battery pack in the first direction.

[0016] In the above technical solution, by setting the third isolating member and the fourth isolating member, the first isolating member and the third isolating member roughly form an L-shaped structure, and the second isolating member and the fourth isolating member also roughly form an L-shaped structure. The third isolating member and the fourth isolating member are not located between the battery pack and the busbar component, which is beneficial to improving the isolation and protection range of the isolation component, and is also beneficial to improving the connection area between the isolation component and other structures, thereby improving the setting reliability of the isolation component.

[0017] In some embodiments, the isolation component also includes a fifth isolation component and a sixth isolation component arranged relatively to each other along the first direction, the fifth isolation component is bent and connected to one end of the first isolation component away from the second isolation component, the sixth isolation component is bent and connected to one end of the second isolation component away from the first isolation component, and the fifth isolation component and the sixth isolation component are respectively arranged on both sides of the convergence component in the first direction.

[0018] In the above technical solution, by setting the fifth isolating member and the sixth isolating member, the first isolating member and the fifth isolating member roughly form an L-shaped structure, and the second isolating member and the sixth isolating member also roughly form an L-shaped structure. The fifth isolating member and the sixth isolating member are not located between the battery pack and the busbar component, which is beneficial to improving the isolation and protection range of the isolation component, and is also beneficial to improving the connection area between the isolation component and other structures, and improving the setting reliability of the isolation component.

[0019] In some embodiments, the isolation component also includes a seventh isolation component and an eighth isolation component, and the seventh isolation component and the eighth isolation component are both arranged on the side of the bus component away from the electrode assembly. The seventh isolation component is bent and connected to the fifth isolation component and is opposite to the first isolation component, and the eighth isolation component is bent and connected to the sixth isolation component and is opposite to the second isolation component.

[0020] In the above technical solution, the first isolating member, the fifth isolating member and the seventh isolating member define a groove that cooperates with the edge of one side of the convergence component in the first direction. Similarly, the second isolating member, the sixth isolating member and the eighth isolating member define a groove that cooperates with the edge of the other side of the convergence component in the first direction. This is beneficial to improving the assembly reliability of the isolation component and the convergence component and achieving a stable setting of the isolation component.

[0021] In some embodiments, the isolation member covers the entire outer periphery of the busbar member.

[0022] In the above technical solution, by setting an isolation component to cover the entire outer periphery of the convergence component, it is beneficial to improve the assembly reliability of the isolation component and the convergence component, so that the isolation component can be limited with the convergence component in multiple directions, further improving the setting reliability of the isolation component.

[0023] In some embodiments, the isolation component is a one-piece piece or a split piece.

[0024] In the above technical solution, the split isolation components allow the battery pack and the busbar components to be adjusted more flexibly during the assembly process, which is convenient for adapting to different installation environments. Moreover, the split isolation components make it easier to partially disassemble and reinstall the battery pack when maintenance or replacement is required, thereby reducing maintenance costs and improving maintenance efficiency. The integrated isolation components can form a more solid overall structure during the manufacturing process, which is beneficial to reducing the number of steps and components in the assembly process, thereby simplifying the assembly process, helping to improve production efficiency and reduce assembly costs.

[0025] In some embodiments, when the energy density of the soft-pack battery cell ρ>390Wh / L, the melting point of the isolation component T≥400°C; when the energy density of the soft-pack battery cell ρ≤390Wh / L, the melting point of the isolation component 300°C≤T<400°C.

[0026] In the above technical scheme, by matching the melting point of the isolation component with the energy density of the soft-pack battery cell, the isolation component can have suitable high temperature resistance, thereby improving the reliability of the isolation component, thereby improving the reliability of the battery device, while also taking into account the cost of the isolation component, which is beneficial to reducing the cost of the battery device.

[0027] In some embodiments, the isolation component is a piece of high temperature resistant insulating material.

[0028] In the above technical solution, by setting the isolation component to a high-temperature resistant insulating material, when the battery device has thermal runaway, the isolation component is not easy to melt and cause performance damage, which is convenient for increasing the service life of the isolation component. At the same time, the isolation component has a good insulation effect, which is convenient for reducing the risk of short circuit of the soft-pack battery cell, and can provide a stable electrical environment for the battery pack, thereby improving the reliability of the battery device.

[0029] In some embodiments, the isolation member is a ceramic composite member, a ceramic member, or a Teflon member.

[0030] In the above technical solution, these materials not only have excellent high temperature resistance and can remain stable in the high temperature environment generated by the operation of the battery pack, even if the battery device has thermal runaway, the isolation components are not easy to melt and cause performance damage, and these materials also have good electrical insulation properties, which can effectively isolate the current and further reduce the risk of short circuit.

[0031] In some embodiments, the battery pack further comprises a U-shaped shell having a mounting cavity therein, an opening being formed on a side of the mounting cavity corresponding to the pole ear, and at least a portion of the isolation component is disposed between the U-shaped shell and the busbar component.

[0032] In the above technical solution, the U-shaped shell can play a certain protective role for multiple soft-pack battery cells, and by arranging at least part of the isolation component between the U-shaped shell and the convergence component, it is convenient for at least one of the U-shaped shell and the convergence component to play a good supporting role for the isolation component, which is conducive to achieving reliable positioning and installation of the isolation component.

[0033] In some embodiments, the battery packs are multiple groups and are arranged in sequence along the first direction, and the tabs of each battery pack are electrically connected to the busbar. In the above technical solution, the tabs of each of the multiple battery packs are electrically connected to the busbar, which facilitates the parallel arrangement of multiple battery packs through the busbar, which is beneficial to improving the total capacity and output capacity of the battery device, and is also beneficial to reducing the load of a single battery pack, and is convenient for realizing the redundant design of the battery pack.

[0034] In some embodiments, the battery device also includes a box having a accommodating cavity, and the battery packs are multiple groups and are arranged in the accommodating cavity. The battery device also includes at least one of a first heat exchange element and a second heat exchange element, and at least one of the first heat exchange element and the second heat exchange element is used for heat exchange with the soft-pack battery cell. The first heat exchange element is arranged between two adjacent battery groups, and the second heat exchange element is arranged between the battery group and the box.

[0035] In the above technical solution, by providing the first heat exchange element and / or the second heat exchange element, it is convenient to control the temperature of the battery pack and achieve good thermal management, which is beneficial to control the temperature of the soft-pack battery cell within a reasonable range, so as to improve the working efficiency and stability of the battery device.

[0036] In some embodiments, the soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell. In the above technical solution, the use of the above types of soft-pack battery cells can provide more options for the design of the battery device to meet different usage requirements. Among them, the soft-pack battery cell is a lithium iron phosphate battery cell, which has the advantages of high reliability, long cycle life, light weight, large capacity, and low internal resistance; the soft-pack battery cell is a ternary battery cell, which has the advantages of high energy density and good electrochemical performance; the soft-pack battery cell is a solid-state battery cell, which has the advantages of high energy density and high reliability, light weight, and good high and low temperature performance.

[0037] In some embodiments, the soft-pack battery cell is a ternary battery cell, and the battery pack further includes a U-shaped shell, which wraps the multiple soft-pack battery cells around three peripheral sides of the multiple soft-pack battery cells, and a shell wall of the U-shaped shell opposite to its open end is provided with a pressure relief portion.

[0038] In the above technical solution, when the ternary battery cell undergoes thermal runaway expansion and exhaust pressure relief, the pressure relief unit can guide the exhausted gas to directional pressure relief, thereby reducing the risk of gas chaos affecting the surrounding ternary battery cells, and also reducing the risk of severe thermal runaway of the battery pack composed of the ternary battery cells, which is beneficial to the thermal runaway management of the battery pack and improves the reliability of the battery pack composed of the ternary battery cells.

[0039] In some embodiments, the pressure relief portion is configured as a pressure relief hole; or, the pressure relief portion is configured as a notch; or, the pressure relief portion is configured as a weakened portion. In the above technical solution, more options can be provided for the design of the pressure relief portion to meet different usage requirements.

[0040] In a second aspect, an embodiment of the present application provides an electrical device, comprising the above-mentioned battery device.

[0041] In the above technical solution, since the battery device has high reliability, the use of the battery device can improve the power consumption reliability of the power-consuming device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 A schematic diagram of a structure in which the electric device provided in some embodiments of the present application is a vehicle;

[0044] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0045] Figure 3An exploded view of the structure of a battery device provided in another embodiment of the present application;

[0046] Figure 4 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application;

[0047] Figure 5 A schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application;

[0048] Figure 6 A schematic diagram of a partial structure of a battery device provided in some further embodiments of the present application;

[0049] Figure 7 A schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application;

[0050] Figure 8 for Figure 7 The schematic diagram of the assembly of the manifold component and the isolation component shown;

[0051] Fig. 9 A schematic diagram of assembling a busbar component and an isolation component of a battery device provided in some other embodiments of the present application;

[0052] Fig.10 for Fig. 9 A cross-sectional view of the manifold component and the isolation component shown in FIG.

[0053] Reference numerals:

[0054] Power device 1000, battery device 100, controller 200, motor 300,

[0055] Box body 1, accommodating chamber 1a, first box body 11, second box body 12,

[0056] Battery pack 2, battery cell 21, soft-pack battery cell 21A, packaging body 212, tab 213, U-shaped shell 22, mounting cavity 22a, opening 22b, pressure relief portion 220, first shell wall 221, second shell wall 222, third shell wall 223,

[0057] Convergence components 3,

[0058] The isolation member 4 , the escape opening 4 a , the first isolation member 41 , the second isolation member 42 , the third isolation member 43 , the fourth isolation member 44 , the fifth isolation member 45 , the sixth isolation member 46 , the seventh isolation member 47 , and the eighth isolation member 48 . DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0061] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0062] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0063] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0064] In the embodiments of the present application, the same reference numerals represent 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 the various components in the embodiments of the present application shown in the drawings are only exemplary and should not constitute any limitation on the present application. The "multiple" appearing in the present application refers to more than two (including two).

[0065] In the present application, the battery cells may include lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel metal hydride batteries, nickel cadmium batteries, lead storage batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, which are not limited in the embodiments of the present application.

[0066] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present application may refer to one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, in parallel, or in mixed connection through a busbar. In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging multiple battery cells.

[0067] As an example, the battery cell assembly may be a battery module, where a plurality of battery cells are arranged and fixed to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0068] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the housing. As an example, the battery cell assembly may be a battery pack, and the battery cell assembly may be accommodated in the housing by fixing the battery pack in the housing. As an example, the battery cell assembly may also be accommodated in the housing by directly fixing a plurality of battery cells to the housing. The housing may prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0069] The battery cell includes a shell, an electrode assembly and an electrolyte. The shell is used to accommodate the electrode assembly and the electrolyte. In the present application, a soft-pack battery cell may refer to a battery cell using a soft outer packaging material as a shell. For example, the packaging body described herein may serve as a shell of a soft-pack battery cell. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking a lithium-ion battery as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. 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 not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0070] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0071] In recent years, new energy vehicles have developed by leaps and bounds, and battery devices, as the power source of electric vehicles, play an irreplaceable and important role. Among them, battery devices use battery cells to store and provide electrical energy, and among the many types of battery cells, soft-pack battery cells have been widely used due to their unique structure and advantages.

[0072] In the related art, in a general battery device, multiple soft-pack battery cells are usually installed side by side during production and assembly, and the soft-pack battery cells are electrically connected to the busbar. However, due to the limitations of the busbar manufacturing process, the busbar often has some unavoidable problems, such as burrs on the busbar, assembly tolerances on the busbar, etc. During the assembly process of the soft-pack battery cells and the busbar, the busbar is prone to scratching the soft-pack battery cells, resulting in electrolyte leakage, which is easy to cause insulation failure of the battery device and affect the reliability of the battery device.

[0073] Based on the above considerations, a battery device is proposed, which includes a battery pack, a busbar component and an isolation component. The battery pack includes a plurality of soft-pack battery cells arranged in sequence along a first direction, each soft-pack battery cell includes an electrode assembly and a packaging body, the electrode assembly is provided with a pole ear, the electrode assembly is encapsulated inside the packaging body, a portion of the pole ear extends from the inside of one end of the packaging body in a second direction, the busbar component is arranged on the side where the pole ear is located, at least a portion of the isolation component is arranged between the battery pack and the busbar component to separate the packaging body from the busbar component, the isolation component is formed with an avoidance port, the pole ears of the plurality of soft-pack battery cells pass through the avoidance port and are electrically connected to the busbar component, and the first direction and the second direction are perpendicular.

[0074] In the above technical solution, the setting of the isolation component will not affect the electrical connection between the pole ear and the busbar component. At the same time, the isolation component can separate the packaging body and the busbar component. Due to the limitations of the manufacturing process of the busbar component, burrs are usually present on the busbar component. During the assembly of the battery pack with the busbar component, the isolation component can play an isolating role, separating the burrs on the busbar component from the packaging body of the soft-pack battery cell. The spacing between the battery pack and the busbar component in the second direction can also be improved due to the setting of the isolation component, so that the burrs on the busbar component are not easy to scratch the packaging body of the soft-pack battery cell, and the burrs on the busbar component are not easy to pierce the isolation component and scratch the packaging body of the soft-pack battery cell. At the same time, even if the busbar component has a certain assembly tolerance and stops against the packaging body, the isolation component can separate the busbar component from the packaging body, play a role in protecting the soft-pack battery cell, reduce the risk of the packaging body of the soft-pack battery cell being punctured and damaged, which is beneficial to improving the reliability of the use of the soft-pack battery cell, and the electrolyte of the soft-pack battery cell is not easy to leak from the packaging body, which is beneficial to improving the reliability of the battery device.

[0075] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. A power supply system of the electrical device can be composed of the battery device disclosed in the present application.

[0076] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0077] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electric device 1000 of an embodiment of the present application. Figure 1 , Figure 1The power consumption device 1000 provided for some embodiments of the present application is a schematic diagram of the structure of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle, and the battery device 100 can be provided at the bottom, head or tail of the vehicle. The battery device 100 can be used to power the vehicle, for example, the battery device 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle. Working power requirements.

[0078] In some embodiments of the present application, the battery device 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0079] Please refer to Figure 2 , Figure 2 The structural exploded diagram of the battery device 100 provided for some embodiments of the present application. The battery device 100 includes a box body 1 and a plurality of battery cells 21, and the battery cells 21 are used to be accommodated in the box body 1. Among them, the box body 1 is used to provide an assembly space for the battery cells 21, and the box body 1 can adopt a variety of structures. In some embodiments, the box body 1 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 21. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 1 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0080] In the battery device 100, multiple battery cells 21 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 21 are connected in series and in parallel. Multiple battery cells 21 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 21 is accommodated in the box 1; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 21 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 1. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing electrical connection between multiple battery cells 21.

[0081] Please refer to Figure 2 , Figure 2 The structure of the battery device 100 provided in some embodiments of the present application is exploded. The battery device 100 includes multiple rows of battery cells 21, which are arranged along the length direction of the box body 1, and each row of battery cells 21 includes multiple battery cells 21 arranged along the width direction of the box body 1; or, multiple rows of battery cells 21 are arranged along the width direction of the box body 1, and each row of battery cells 21 includes multiple battery cells 21 arranged along the length direction of the box body 1.

[0082] Each battery cell 21 may be a secondary battery or a primary battery, wherein a secondary battery refers to a battery cell 21 that can be continuously used by activating the active material by charging after the battery cell is discharged; it may also 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., which is not limited in the embodiments of the present application. The battery cell 21 may be cylindrical, flat, rectangular, or in other shapes. For example, in Figure 2 In the figure, the battery cell 21 is in the shape of a rectangular parallelepiped.

[0083] For example, Figure 3 As shown, the battery cell 21 is roughly in the shape of a cuboid, and the height direction of the battery cell 21 is the third direction Z, the length direction of the battery cell is the second direction Y, and the thickness direction of the battery cell is the first direction X. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. However, it is not limited to this. In other embodiments of the present application, the battery cell 21 can also be in the shape of a polygonal prism, a flat body, or other shapes.

[0084] Please refer to Figure 3 and Figure 4In the embodiment of the present application, the battery device 100 includes a battery pack 2 and a busbar 3. The battery pack 2 includes a plurality of soft-pack battery cells 21A arranged in sequence along a first direction X. Each soft-pack battery cell 21A includes an electrode assembly and a packaging body 212. The electrode assembly is provided with a pole ear 213. The electrode assembly is encapsulated in the packaging body 212. A portion of the pole ear 213 extends from the inside of one end of the packaging body 212 in the second direction. The busbar 3 is arranged on the side where the pole ear 213 is located. Then, the busbar 3 can be arranged on one side of the battery pack 2 in the second direction, and the busbar 3 is opposite to the pole ear 213 in the second direction. The pole ears 213 of the plurality of soft-pack battery cells 21A are electrically connected to the busbar 3, so as to realize the parallel arrangement of the plurality of soft-pack battery cells 21A of the battery pack 2, which is beneficial to increase the total capacity and output capacity of the battery pack 2, and is beneficial to reduce the load of a single soft-pack battery cell 21A, and is convenient to realize the redundant design of the soft-pack battery cell 21A. Wherein, the first direction is perpendicular to the second direction.

[0085] Please refer to Figure 4-Figure 7 The battery device 100 also includes an isolation component 4, at least a portion of which is disposed between the battery pack 2 and the busbar component 3 to separate the packaging body 212 and the busbar component 3, and the isolation component 4 is formed with an escape port 4a, through which the tabs 213 of the plurality of soft-pack battery cells 21A pass, and the tabs 213 of the plurality of soft-pack battery cells 21A are electrically connected to the busbar component 3.

[0086] It can be seen that the setting of the isolation component 4 will not affect the electrical connection between the pole ear 213 and the busbar component 3. At the same time, the isolation component 4 can separate the packaging body 212 and the busbar component 3. Due to the limitations of the manufacturing process of the busbar component 3, burrs usually exist on the busbar component 3. The above-mentioned setting of the embodiment of the present application can make the isolation component 4 play an isolation role during the assembly of the battery pack 2 with the busbar component 3, and separate the burrs on the busbar component 3 from the packaging body 212 of the soft-pack battery cell 21A. In addition, the distance between the battery pack 2 and the busbar component 3 in the second direction will also be increased due to the setting of the isolation component 4, so that the burrs on the busbar component 3 are not easy to scratch the soft-pack battery. The burrs on the packaging body 212 of the single body 21A and the confluence component 3 are not easy to pierce the isolation component 4 and scratch the packaging body 212 of the soft-pack battery single body 21A. At the same time, even if the confluence component 3 has a certain assembly tolerance and stops against the packaging body 212, the isolation component 4 can separate the confluence component 3 from the packaging body 212, thereby protecting the soft-pack battery single body 21A and reducing the risk of the packaging body 212 of the soft-pack battery single body 21A being punctured and damaged, and the risk of insulation failure, which is beneficial to improving the reliability of the use of the soft-pack battery single body 21A. The electrolyte of the soft-pack battery single body 21A is also not easy to leak from the packaging body 212, which is beneficial to improving the reliability of the battery device 100.

[0087] In the above technical solution, the setting of the isolation component 4 can not only avoid the pole ear 213 so as not to affect the electrical connection between the pole ear 213 and the busbar component 3, but also play a certain isolation role, separating the burrs on the busbar component 3 from the packaging body 212 of the soft-pack battery cell 21A, reducing the risk of the packaging body 212 of the soft-pack battery cell 21A being punctured and damaged, and the risk of insulation failure, which is beneficial to improving the reliability of the battery device 100.

[0088] It can be understood that in the embodiment of the present application, the structure of the conduit component 3 is not specifically limited. For example, the conduit component 3 can be formed into a plate-like structure, but is not limited thereto.

[0089] Please refer to Figure 4-Figure 9 In some embodiments, at least one of the battery pack 2 and the busbar component 3 is fixed to the isolation component 4, so as to achieve reliable setting of the isolation component 4, reduce the risk of movement of the isolation component 4, and facilitate that at least a portion of the isolation component 4 is always arranged between the battery pack 2 and the busbar component 3.

[0090] It can be understood that when the battery pack 2 and the busbar component 3 are both fixed to the isolation component 4, the busbar component 3 and the battery pack 2 can provide support to each other through the isolation component 4, which is conducive to making the structure of the battery device 100 more stable. It should be noted that in the embodiment of the present application, there is no specific limitation on the fixing method between the above-mentioned at least one of the battery pack 2 and the busbar component 3 and the isolation component 4, such as gluing.

[0091] In addition, when the battery pack 2 is fixed to the isolation component 4, the soft-pack battery cell 21A can be arranged to be fixedly connected to the isolation component 4; or, if the battery pack 2 also includes the U-shaped shell 22 described later, at this time, one of the U-shaped shell 22 and the soft-pack battery cell 21A is fixed to the isolation component 4.

[0092] Of course, in other embodiments of the present application, the battery device 100 further includes a box body 1 , and the battery pack 2 , the busbar component 3 and the isolation component 4 are all arranged in the accommodating cavity 1 a , and the isolation component 4 can be fixedly connected to the box body 1 .

[0093] In some embodiments, the size of the battery pack 2 in the second direction is larger than its size in the first direction and the size in the third direction, and the first direction and the second direction are respectively perpendicular to the third direction; with the second direction as the axial direction, the isolation component 4 can be arranged in any of the following ways: Method 1, such as Figure 5 As shown, the isolation component 4 covers at least one side of the outer periphery of the battery pack 2; Method 2: Figure 6-Figure 10 As shown, the isolation component 4 covers at least one side of the outer circumference of the current collecting component 3. It can be seen that, no matter in the first or second method, a part of the isolation component 4 is not located between the battery pack 2 and the current collecting component 3.

[0094] In the above technical solution, by setting the isolation component 4 to cover at least one side of the outer peripheral side of the battery pack 2, or to cover at least one side of the outer peripheral side of the convergence component 3, while expanding the isolation range of the isolation component 4, it is convenient to improve the assembly convenience of the isolation component 4 to a certain extent, and it is also beneficial to increase the matching area between the isolation component 4 and the battery pack 2 and / or the convergence component 3, and improve the setting reliability of the isolation component 4.

[0095] For example, Figure 5 As shown, the outer peripheral side of the battery pack 2 includes both sides of the battery pack 2 in the first direction and both sides in the third direction, and the isolation component 4 covers both sides of the battery pack 2 in the first direction and at least one side of the two sides of the battery pack 2 in the third direction; Figure 6-Figure 10 As shown, the outer peripheral side of the busbar component 3 includes both sides of the busbar component 3 in the first direction and both sides of the busbar component 3 in the third direction, and the isolation component 4 covers at least one of the two sides of the busbar component 3 in the first direction and the two sides of the busbar component 3 in the third direction.

[0096] Please refer to Figure 4-Figure 7 In some embodiments, the isolation component 4 includes a first isolation member 41 and a second isolation member 42 arranged in sequence along a first direction, the first isolation member 41 and the second isolation member 42 are both located between the battery pack 2 and the busbar component 3, and the avoidance port 4a is located between the first isolation member 41 and the second isolation member 42.

[0097] In the above technical solution, the structure of the isolation component 4 is simple, and since the first isolation component 41 and the second isolation component 42 are respectively located on the opposite sides of the avoidance opening 4a in the first direction, when the battery pack 2 is assembled with the convergence component 3, due to the isolation of the first isolation component 41 and the second isolation component 42, it is convenient to keep a certain distance between the entire battery pack 2 and the convergence component 3, and it is not easy for one end of the battery pack 2 in the first direction to be scratched, which is beneficial to further reduce the probability of burrs on the convergence component 3 scratching the soft-pack battery cell 21A.

[0098] It can be understood that the first isolating member 41 and the second isolating member 42 can be arranged at intervals along the first direction, or the first isolating member 41 and the second isolating member 42 can also be connected.

[0099] Optionally, in the third direction, the height of the isolation component 4 may be greater than or equal to the height of the battery pack 2, and / or the height h2 of the isolation component 4 may be greater than or equal to the height h1 of the busbar component 3. For example, the two ends of the isolation component 4 in the third direction may be flush with the corresponding two ends of the battery pack 2, or the two ends of the isolation component 4 in the third direction may exceed the corresponding two ends of the battery pack 2.

[0100] Please refer to Figure 4-Figure 7In some embodiments, the first isolating member 41 and the second isolating member 42 respectively extend at least to both ends of the battery pack 2 in the first direction; for example, for the first isolating member 41, the first isolating member 41 may extend to be flush with one end of the battery pack 2 in the first direction, or the first isolating member 41 may extend beyond one end of the battery pack 2 in the first direction.

[0101] Exemplarily, taking the first direction as the left-right direction, the first isolation member 41 is located on the left side of the second isolation member 42, the left end of the first isolation member 41 can be flush with the left end of the battery pack 2, or the left end of the first isolation member 41 can extend to the left beyond the left end of the battery pack 2, and the right end of the second isolation member 42 can be flush with the right end of the battery pack 2, or the right end of the second isolation member 42 can extend to the right beyond the right end of the battery pack 2.

[0102] In the above technical solution, by arranging the first isolation member 41 and the second isolation member 42 to extend at least to the two ends of the battery group 2 in the first direction, it is beneficial to improve the isolation range of the isolation component 4, improve the isolation effect of the isolation component 4, and further help to maintain a certain distance between the entire battery group 2 and the convergence component 3, further reducing the probability of the battery group 2 being scratched by the convergence component 3.

[0103] Please refer to Figure 4-Figure 7 In some embodiments, in the first direction, the width of the first isolating member 41 is x1, and the width of the second isolating member 42 is x2, x1≥5mm, x2≥5mm, which is beneficial to improving the isolation effect of the first isolating member 41 and the second isolating member 42, and is convenient for further reducing the probability of the packaging body 212 being scratched; and / or, the thickness of the portion of the isolating member 4 arranged between the battery pack 2 and the busbar member 3 is t, 0.5mm≤t≤1.5mm, so that the isolating member 4 can effectively separate the burrs of different sizes and structures on the busbar member 3 from the packaging body 212, while also taking into account the different assembly tolerances of the busbar member 3, and making the isolating member 4 not occupy too much layout space, so as to take into account the energy density of the battery device 100.

[0104] Please refer to Figure 5 In some embodiments, the isolation component 4 also includes a third isolation member 43 and a fourth isolation member 44 arranged relatively to each other along the first direction, the third isolation member 43 is bent and connected to one end of the first isolation member 41 away from the second isolation member 42, the fourth isolation member 44 is bent and connected to one end of the second isolation member 42 away from the first isolation member 41, and the third isolation member 43 and the fourth isolation member 44 are respectively arranged on both sides of the battery pack 2 in the first direction.

[0105] In the above technical solution, by setting the third isolating member 43 and the fourth isolating member 44, the first isolating member 41 and the third isolating member 43 roughly form an L-shaped structure, and the second isolating member 42 and the fourth isolating member 44 also roughly form an L-shaped structure. The third isolating member 43 and the fourth isolating member 44 are not located between the battery pack 2 and the busbar member 3, which is beneficial to improving the isolation and protection range of the isolation member 4. For example, when other components are also set on the side of the battery pack 2 in the first direction, the setting of the third isolating member 43 and the fourth isolating member 44 is beneficial to reducing the damage of the above-mentioned other components to the battery pack 2, and is also beneficial to increasing the connection area between the isolation member 4 and other structures, thereby improving the setting reliability of the isolation member 4.

[0106] It can be understood that when the isolation component 4 is fixed to the battery pack 2, the provision of the third isolation component 43 and the fourth isolation component 44 is beneficial to increasing the connection area between the isolation component 4 and the battery pack 2 and improving the connection reliability between the isolation component 4 and the battery pack 2.

[0107] Please refer to Figure 6 and Figure 7 In some embodiments, the isolation component 4 also includes a fifth isolation member 45 and a sixth isolation member 46 arranged relatively to each other along the first direction, the fifth isolation member 45 is bent and connected to one end of the first isolation member 41 away from the second isolation member 42, the sixth isolation member 46 is bent and connected to one end of the second isolation member 42 away from the first isolation member 41, and the fifth isolation member 45 and the sixth isolation member 46 are respectively arranged on both sides of the confluence component 3 in the first direction.

[0108] In the above technical solution, by setting the fifth isolation member 45 and the sixth isolation member 46, the first isolation member 41 and the fifth isolation member 45 roughly form an L-shaped structure, and the second isolation member 42 and the sixth isolation member 46 also roughly form an L-shaped structure. The fifth isolation member 45 and the sixth isolation member 46 are not located between the battery pack 2 and the busbar member 3, which is beneficial to improving the isolation and protection range of the isolation member 4, and is also beneficial to improving the connection area between the isolation member 4 and other structures, thereby improving the setting reliability of the isolation member 4.

[0109] In addition, in the above scheme, the bending connection between the first isolation member 41 and the fifth isolation member 45 can isolate one corner of the convergence member 3 from the battery pack 2, and the bending connection between the second isolation member 42 and the sixth isolation member 46 can isolate another corner of the convergence member 3 from the battery pack 2, so that the isolation member 4 can better cover the corner of the convergence member 3. The corner of the convergence member 3 is prone to burrs. Even if the burrs on the corner of the convergence member 3 are longer, it is not easy to scratch the soft-pack battery cell 21A, which is convenient for further improving the reliability of the battery pack 2, and then improving the reliability of the battery device 100.

[0110] It can be understood that when the isolation component 4 is fixed to the busbar component 3, the provision of the third isolation component 43 and the fourth isolation component 44 is beneficial to increasing the connection area between the isolation component 4 and the battery pack 2 and improving the connection reliability between the isolation component 4 and the battery pack 2.

[0111] Please refer to Figure 7 and Figure 8 In some embodiments, the isolation component 4 also includes a seventh isolation component 47 and an eighth isolation component 48. The seventh isolation component 47 and the eighth isolation component 48 are both arranged on the side of the busbar component 3 away from the electrode assembly. The seventh isolation component 47 is bent and connected to the fifth isolation component 45, and the seventh isolation component 47 is opposite to the first isolation component 41. The eighth isolation component 48 is bent and connected to the sixth isolation component 46, and the eighth isolation component 48 is opposite to the second isolation component 42.

[0112] It can be seen that the first isolating member 41, the fifth isolating member 45 and the seventh isolating member 47 define a groove that cooperates with the edge of one side of the convergence component 3 in the first direction. Similarly, the second isolating member 42, the sixth isolating member 46 and the eighth isolating member 48 define a groove that cooperates with the edge of the other side of the convergence component 3 in the first direction, which is beneficial to improving the assembly reliability of the isolation component 4 and the convergence component 3 and achieving a stable setting of the isolation component 4.

[0113] It can be understood that the isolation component 4 and the convergence component 3 can be assembled in any of the following ways, but not limited to them: the isolation component 4 is first formed into a groove, and then the corresponding edge of the convergence component 3 is inserted into the corresponding groove; or, the isolation component 4 is a plate-like structure before assembly, the first isolation component 41 is first attached to the convergence component 3, and then the isolation component 4 is bent so that the fifth isolation component 45 is attached to the outer peripheral wall of the convergence component 3, and then the isolation component 4 is bent so that the seventh isolation component 47 is attached to the side of the convergence component 3 away from the first isolation component 41, and the second isolation component 42, the sixth isolation component 46 and the eighth isolation component 48 are also in the same way, and will not be repeated.

[0114] In addition, in the above solution, the busbar component 3 may correspond to one group of battery groups 2 or may correspond to multiple groups of battery groups 2 arranged sequentially along the first direction.

[0115] Please refer to Fig. 9 and Fig.10 In some embodiments, the isolation component 4 covers the entire outer periphery of the collecting component 3 .

[0116] At this time, the first isolating member 41, the fifth isolating member 45 and the seventh isolating member 47 can cover one circumferential side of the convergence component 3, and the second isolating member 42, the sixth isolating member 46 and the eighth isolating member 48 can cover the other circumferential side of the convergence component 3. The isolation component 4 also includes a first part and a second part arranged relatively to each other along the third direction. The first part and the second part respectively define a groove, and the groove of the first part and the groove of the second part are arranged relatively to each other. One end of the first part in the first direction connects the first isolating member 41, the fifth isolating member 45 and the seventh isolating member 47, and the other end of the first part in the first direction connects the second isolating member 42, the sixth isolating member 46 and the eighth isolating member 48. Similarly, one end of the second part in the first direction connects the first isolating member 41, the fifth isolating member 45 and the seventh isolating member 47, and the other end of the second part in the first direction connects the second isolating member 42, the sixth isolating member 46 and the eighth isolating member 48.

[0117] In the above technical solution, by setting the isolation component 4 to cover the entire outer periphery of the convergence component 3, it is beneficial to improve the assembly reliability of the isolation component 4 and the convergence component 3, so that the isolation component 4 can be limited with the convergence component 3 in multiple directions, further improving the setting reliability of the isolation component 4.

[0118] In some embodiments, the isolation component 4 is an integral part or a split part.

[0119] In the above technical solution, the split isolation component 4 allows the battery pack 2 and the convergence component 3 to be adjusted more flexibly during the assembly process, so as to adapt to different installation environments. In particular, when there are differences in the size or shape of the battery pack 2 and / or the convergence component 3, the split isolation component 4 can more easily adapt to these changes so that the battery pack 2 can be correctly and stably installed in the battery device 100. Moreover, the split isolation component 4 makes it easier to partially disassemble and reinstall the battery pack 2 when maintenance or replacement is required, thereby reducing maintenance costs and improving maintenance efficiency. The integrated isolation component 4 can form a more solid overall structure during the manufacturing process, which is beneficial to reducing the number of steps and components in the assembly process, thereby simplifying the assembly process, helping to improve production efficiency and reduce assembly costs.

[0120] It can be understood that when the isolation component 4 is an integral part and includes the first isolation component 41 and the second isolation component 42, the first isolation component 41 is integrally connected to the second isolation component 42; when the isolation component 4 is a split part and includes the first isolation component 41 and the second isolation component 42, the first isolation component 41 and the second isolation component 42 are spaced apart.

[0121] In some embodiments, when the energy density ρ of the soft-pack battery cell 21A is greater than 390Wh / L, the melting point T of the isolation component 4 is greater than or equal to 400°C; when the energy density ρ of the soft-pack battery cell 21A is less than or equal to 390Wh / L, the melting point 300°C less than or equal to T less than 400°C of the isolation component 4.

[0122] When the energy density ρ of the soft-pack battery cell 21A is greater than 390Wh / L, the temperature of the soft-pack battery cell 21A when thermal runaway occurs is relatively high, and the isolation component 4 can select a material with a melting point greater than or equal to 400°C, which can reduce the risk of the isolation component 4 melting and causing performance damage during thermal runaway, and improve the high temperature resistance of the protective member 20. When the energy density ρ of the soft-pack battery cell 21A is less than or equal to 390Wh / L, the temperature of the soft-pack battery cell 21A when thermal runaway occurs is relatively low, and the isolation component 4 can select a material with a melting point less than 400°C and greater than or equal to 300°C, which can meet the high temperature resistance of the isolation component 4 and also help reduce costs.

[0123] It can be seen that by matching the melting point of the isolation component 4 with the energy density of the soft-pack battery cell 21A, the isolation component 4 can have suitable high temperature resistance, thereby improving the reliability of the isolation component 4, thereby improving the reliability of the battery device 100, while also taking into account the cost of the isolation component 4, which is beneficial to reducing the cost of the battery device 100.

[0124] In some embodiments, the isolation component 4 is made of high temperature resistant insulating material.

[0125] It can be seen that by setting the isolation component 4 to be a high-temperature resistant insulating material, when the battery device 100 has thermal runaway, the isolation component 4 is not easy to melt and cause performance damage, which is convenient for improving the service life of the isolation component 4. At the same time, the isolation component 4 has a good insulation effect, which is convenient for reducing the risk of short circuit of the soft-pack battery cell 21A, and can provide a stable electrical environment for the battery pack 2, thereby improving the reliability of the battery device 100.

[0126] In some embodiments, the isolation component 4 is a ceramic composite material member (eg, a TC composite tape), a ceramic member, or a Teflon member.

[0127] It can be seen that these materials not only have excellent high temperature resistance and can remain stable in the high temperature environment generated by the operation of the battery pack 2, even if the battery device 100 has thermal runaway, the isolation component 4 is not easy to melt and cause performance damage, and these materials also have good electrical insulation properties, which can effectively isolate the current and further reduce the risk of short circuit.

[0128] Please refer to Figure 3-Figure 7In some embodiments, the battery pack 2 further includes a U-shaped shell 22, the U-shaped shell 22 having an installation cavity 22a, an opening 22b is formed on the side of the installation cavity 22a corresponding to the pole ear 213, and at least a portion of the isolation component 4 disposed between the battery pack 2 and the busbar component 3 is disposed between the U-shaped shell 22 and the busbar component 3.

[0129] It can be seen that the U-shaped shell 22 is used to accommodate multiple soft-pack battery cells 21A arranged side by side. The U-shaped shell 22 can wrap multiple soft-pack battery cells 21A around three peripheral sides of the multiple soft-pack battery cells 21A, and the U-shaped shell 22 can wrap the three sides of the multiple soft-pack battery cells 14. The multiple soft-pack battery cells 14 arranged side by side can be loaded into the U-shaped shell 22 through the open end 120 of the U-shaped shell 22, which is convenient for simplifying the assembly process of the battery pack 10.

[0130] Exemplarily, the U-shaped shell 22 includes a first shell wall 221, a second shell wall 222 and a third shell wall 223. The first shell wall 221 and the third shell wall 223 are spaced apart and arranged opposite to each other along the first direction. The two ends of the second shell wall 222 are respectively bent to connect the first shell wall 221 and the third shell wall 223, so that one end of the U-shaped shell 22 in the third direction is formed as an open end 120, and the second shell wall 222 is opposite to the open end 120. At the same time, the U-shaped shell 22 is respectively formed with openings 22b on both sides in the second direction.

[0131] In the above technical solution, the U-shaped shell 22 can play a certain protective role for multiple soft-pack battery cells 21A, and by arranging at least part of the isolation component 4 between the U-shaped shell 22 and the convergence component 3, it is convenient for at least one of the U-shaped shell 22 and the convergence component 3 to play a good supporting role for the isolation component 4, which is conducive to achieving reliable limiting and installation of the isolation component 4.

[0132] For example, Figure 5 As shown, the battery pack 2 also includes a U-shaped shell 22, and the isolation component 4 includes a first isolation member 41, a second isolation member 42, a third isolation member 43 and a fourth isolation member 44. The first isolation member 41 and the second isolation member 42 are arranged at intervals along the first direction, the third isolation member 43 is bent and connected to the end of the first isolation member 41 away from the second isolation member 42, and the fourth isolation member 44 is bent and connected to the end of the second isolation member 42 away from the first isolation member 41. The third isolation member 43 and the fourth isolation member 44 are respectively arranged on both sides of the battery pack 2 in the first direction; wherein the third isolation member 43 and the fourth isolation member 44 are respectively fixedly connected to the U-shaped shell 22.

[0133] Please refer to Figure 3 and Figure 4In some embodiments, there are multiple battery packs 2 and the multiple battery packs 2 are arranged in sequence along the first direction, and the tabs 213 of each battery pack 2 are electrically connected to the busbar component 3 respectively.

[0134] In the above technical solution, the pole ears 213 of each group of the multiple battery groups 2 are electrically connected to the busbar component 3 respectively, which is convenient for realizing the parallel setting of the multiple battery groups 2 through the busbar component 3, which is beneficial to improving the total capacity and output capacity of the battery device 100, and is also beneficial to reducing the load of a single battery group 2, so as to realize the redundant design of the battery group 2.

[0135] It can be understood that in the embodiment of the present application, there can be two busbar components 3, and the two busbar components 3 can be respectively arranged on both sides of the battery pack 2 in the second direction. For a single soft-pack battery cell 21A, the positive electrode tab and the negative electrode tab can be respectively located at the two ends of the soft-pack battery cell 21A in the second direction, and the positive electrode tab is electrically connected to one of the busbar components 3, and the negative electrode tab is electrically connected to the other busbar component 3.

[0136] Please refer to Figure 3 and Figure 4 In some embodiments, the battery device 100 further includes a box 1, the box 1 has a receiving cavity 1a, there are multiple battery packs 2 and the multiple battery packs 2 are arranged in the receiving cavity 1a, and the confluence component 3 and the isolation component 4 can also be arranged in the receiving cavity 1a. The battery device 100 also includes at least one of a first heat exchanger and a second heat exchanger, and the at least one of the first heat exchanger and the second heat exchanger is used for heat exchange with the soft-pack battery cell 21A. The first heat exchanger is arranged between two adjacent battery packs 2, and the second heat exchanger is arranged between the battery pack 2 and the box 1.

[0137] It can be seen that by arranging the battery pack 10 in the accommodating chamber 1a, the accommodating chamber 1a provides a relatively closed environment for the battery pack 10, so that the battery pack 10 is not easily disturbed by the external environment during operation; the first heat exchange element is arranged between two adjacent battery packs 2, for example, the first heat exchange element is arranged between the U-shaped shells 22 of two adjacent battery packs 2, so that the first heat exchange element can exchange heat with the two adjacent battery packs 10, so that the operating temperature of the multiple battery packs 10 can be maintained within a relatively suitable range, which helps to reduce the temperature difference between the battery packs 10 and facilitates improving the working stability of the battery device 1, and by The heat exchanger is arranged between two adjacent battery groups 2, which makes full use of the space inside the battery device 100, improves space utilization, and facilitates the miniaturization design of the battery device 1; the second heat exchanger is arranged between the battery group 2 and the box body 1, which also makes it easy to maintain the temperature of the soft-pack battery cell 21A within a suitable range, improves the reliability of the battery device 1, and heat transfer through the second heat exchanger can further enhance the thermal management capability of the battery device 100, which helps to keep the internal temperature of the battery device 100 within a reasonable range when the battery device 100 is working, thereby improving the working efficiency and stability of the battery device 100.

[0138] Exemplarily, a second heat exchange element may be provided between the top wall of the box body 1 and the battery pack 2, and / or a second heat exchange element may be provided between the bottom wall of the box body 1 and the battery pack 2, and / or a second heat exchange element may be provided between at least one of the multiple side walls of the box body 1 and the battery pack 2.

[0139] In some embodiments of the present application, the soft pack battery cell 21A is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell. Among them, the solid-state battery cell can be, but is not limited to, a polymer solid-state battery cell, an oxide solid-state battery cell, a sulfide solid-state battery cell, a halide solid-state battery cell, etc. The solid-state battery cell can also be a semi-solid-state battery cell or a fully solid-state battery cell.

[0140] In the above technical solution, the soft-pack battery cell 21A adopts the above types to provide more options for the design of the battery device 100 to meet different usage requirements. Among them, the soft-pack battery cell 21A is a lithium iron phosphate battery cell, which has the advantages of high reliability, long cycle life, light weight, large capacity, and low internal resistance; the soft-pack battery cell 21A is a ternary battery cell, which has the advantages of high energy density and good electrochemical performance; the soft-pack battery cell 21A is a solid-state battery cell, which has the advantages of high energy density and high reliability, light weight, and good high and low temperature performance.

[0141] In some embodiments of the present application, the soft-pack battery cell 21A is a lithium iron phosphate battery cell, and in the positive electrode material of the soft-pack battery cell 21A, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (1-3): (1-3); the soft-pack battery cell 21A is a ternary battery cell, and in the positive electrode material of the soft-pack battery cell 21A, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (2-3): (1-2).

[0142] In the above technical solution, when the soft-pack battery cell 21A is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated in a limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device 100, so that the lithium iron phosphate battery cell can output a higher amount of electricity in a relatively small volume and weight, meeting the application scenario with certain requirements for energy density. The amount of the binder and the conductive agent used in the above range can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the soft-pack battery cell 21A is a ternary battery cell, since the structure and surface properties of the ternary material itself are relatively complex, the use of the positive electrode active material, binder, and conductive agent in the above-mentioned amount ratio is beneficial to ensure good bonding between the positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, and reducing the risk of active material shedding and electrode pulverization during charging and discharging, and extending the cycle life of the battery device 100.

[0143] In some embodiments, the positive electrode of the soft-pack battery cell 21A may be a positive electrode sheet, which may include a positive electrode collector and a positive electrode film layer disposed on at least one surface of the positive electrode collector, wherein the positive electrode film layer includes a positive electrode active material.

[0144] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode film layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0145] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, silver surface treated aluminum or stainless steel, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0146] As an example, when the soft-pack battery cell 21A of the embodiment of the present application is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide and their respective modified compounds; Optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improve the energy density of the soft-pack battery cell (21A). However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode film layers can also be used. These positive electrode active materials can be used alone or in combination of two or more.

[0147] Examples of phosphates include, but are not limited to, lithium iron phosphate (e.g., LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), at least one of a composite material of lithium manganese phosphate and carbon, a composite material of lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0148] Layered transition metal oxides include Li a Ni b Co c M d O e A f At least one of the compounds and modified compounds thereof. 0.8≤a≤1.2, 0.3≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B, and A includes at least one of N, F, S and Cl. Optionally, 0.5≤b<1, further optionally, 0.75≤b≤0.98.

[0149] Examples of layered transition metal oxides include, but are not limited to, lithium cobalt oxides (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 )、LiNi 0.9 Co 0.05 Mn 0.05 O 2 (also referred to as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds, etc.

[0150] When the soft-pack battery cell 21A of the embodiment of the present application is a sodium ion battery, the positive electrode active material may include but is not limited to at least one of sodium-containing transition metal oxides, polyanion materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0151] As an example, a positive electrode active material for a sodium ion battery may include NaFeO 2 、NaCoO 2 、NaCrO 2 、NaMnO 2 、NaNiO 2 、NaNi 1 / 2 Ti 1 / 2 O 2 、NaNi 1 / 2 Mn 1 / 2 O 2 、Na 2 / 3 Fe 1 / 3 Mn 2 / 3 O 2 、NaNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 、NaFePO 4 、NaMnPO 4 、NaCoPO 4 , Prussian blue materials, general formula X p M' q (PO 4 )r O x Y 3-x In the general formula X p M' q (PO 4 ) r O x Y 3-x , 0<p≤4, 0<q≤2, 1≤r≤3, 0≤x≤2, X includes at least one of H+, Li+, Na+, K+ and NH4+, M' is a transition metal cation, optionally at least one of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halogen anion, optionally at least one of F, Cl and Br.

[0152] In the embodiments of the present application, the modified compounds of the above-mentioned positive electrode active materials can be doping modification and / or surface coating modification of the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0153] The soft-pack battery cell (21A) is accompanied by the deintercalation and consumption of active ions such as Li during the charge and discharge process, and the molar content of Li is different when the soft-pack battery cell (21A) is discharged to different states. In the examples of the positive electrode active materials in the present application, the molar content of Li is the initial state of the material, that is, the state before feeding. The positive electrode active material is used in the battery system, and the molar content of Li may change after the charge and discharge cycle.

[0154] In the examples of the present application regarding the positive electrode active materials, the molar content of oxygen O is only a theoretical value. The release of oxygen from the lattice will cause the molar content of oxygen O to change. In reality, the molar content of oxygen O will fluctuate.

[0155] In the embodiments of the present application, the content of elements in the positive electrode active material has a well-known meaning in the art, and can be detected by equipment and methods well-known in the art, for example, with reference to EPA 6010D-2014, tested by inductively coupled plasma atomic emission spectrometry, and measured by plasma atomic emission (ICP-OES, instrument model: Thermo ICAP7400). First, weigh 0.4 g of positive electrode active material and add 10 ml (50% concentration) of aqua regia thereto. Then place it on a plate at 180 ° C for 30 minutes. After digestion on the plate, dilute to a volume of 100 mL, and use the standard curve method for quantitative testing.

[0156] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode film layer may not be provided on the surface of the foamed metal, but of course, a positive electrode film layer may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0157] In some embodiments, the positive electrode film layer may further optionally include a positive electrode conductive agent. The present application embodiment has no particular restrictions on the type of the positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5wt%.

[0158] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The embodiment of the present application has no particular restrictions on the type of positive electrode binder. As an example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer and fluorine-containing acrylic resin. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5wt%.

[0159] The positive electrode film layer is usually formed by coating the positive electrode slurry on the positive electrode current collector, drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder and any other components in a solvent and stirring them evenly. The solvent can be N-methylpyrrolidone (NMP), but is not limited thereto.

[0160] In some embodiments, the negative electrode may be a negative electrode plate, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, wherein the negative electrode film layer includes a negative electrode active material.

[0161] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode film layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0162] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0163] As an example, the negative electrode active material may adopt the negative electrode active material for soft-pack battery cell 21A known in the art. As an example, the negative electrode active material may include at least one of the following materials: carbon material (for example, the carbon material includes at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based material, tin-based material, lithium titanate, etc. The silicon-based material may include at least one of elemental silicon, silicon oxide compound, silicon carbon composite, silicon nitrogen composite, and silicon alloy. The tin-based material may include at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other traditional materials that can be used as battery negative electrode film layers may also be used. These negative electrode film layers may be used alone or in combination of two or more.

[0164] In some embodiments, the negative electrode active material includes silicon, which may exist in the form of silicon-based materials, such as silicon-based materials that may include at least one of elemental silicon, silicon-oxygen compounds, silicon-carbon compounds, silicon-nitrogen compounds, and silicon alloys. The introduction of silicon can improve the energy density of the soft-pack battery cell 21A.

[0165] In some embodiments, the mass content of silicon in the negative electrode film layer is 1wt% to 32wt%, optionally 2wt% to 19wt%, and further optionally 6wt% to 13wt%. In the soft-pack battery cell 21A system, when the mass content of silicon is within the above range, the energy density of the soft-pack battery cell 21A can be improved.

[0166] In the embodiments of the present application, the mass content of silicon in the negative electrode film layer has a meaning well known in the art and can be detected by using equipment and methods well known in the art. For example, the negative electrode plate is immersed in a solvent such as water, the negative electrode active material is separated from the negative electrode current collector, and the negative electrode active material is obtained by filtration. The negative electrode active material is measured using an ICAP7400 inductively coupled plasma-emission spectrometer of ThermoFisher Scientific, USA, and with reference to GB / T30902-2014 standard to obtain the silicon content.

[0167] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The embodiment of the present application has no particular restrictions on the type of the negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5wt%.

[0168] In some embodiments, the negative electrode film layer may also optionally include a negative electrode binder. The embodiment of the present application has no particular restrictions on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA) and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0169] In some embodiments, the negative electrode film layer may further include other additives. As an example, the other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of the other additives in the negative electrode film layer is ≤ 2wt%.

[0170] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0171] In some embodiments, the separator includes a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0172] The embodiments of the present application have no particular restrictions on the type of isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

[0173] In some embodiments, the material of the isolation membrane may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The isolation membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the isolation membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0174] In some embodiments, the isolation membrane may include a porous base membrane and a coating disposed on at least one side of the porous base membrane, and the coating may include at least one of inorganic particles or organic particles. The porous base membrane may include one or more of polyethylene and polypropylene.

[0175] The inorganic particles have good heat resistance and can improve the heat resistance of the separator as a whole. The inorganic particles will not undergo oxidation and reduction reactions with metal dendrites within the operating voltage range of the sodium ion battery. In other words, the inorganic particles are configured not to undergo oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of the sodium ion battery.

[0176] In some embodiments, the inorganic particles include boehmite γ-AlOOH, alumina Al 2 O 3 、Aluminum hydroxide Al(OH) 3 、Barium sulfate BaSO 4 , magnesium oxide MgO, magnesium hydroxide Mg(OH) 2 , calcium oxide CaO, cerium oxide CeO 2 、Zirconium titanate SrTiO 3 , barium titanate BaTiO 3 and magnesium fluoride MgF 2 One or more of .

[0177] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramid, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0178] In some embodiments, the soft pack battery cell 21A further includes an electrolyte.

[0179] During the charge and discharge process of the battery cell, the active ions are embedded and released back and forth between the positive electrode and the negative electrode, and the electrolyte plays the role of conducting the active ions between the positive electrode and the negative electrode. The embodiment of the present application has no particular restriction on the type of electrolyte, which can be selected according to actual needs. The electrolyte includes an electrolyte salt and a solvent. The types of electrolyte salts and solvents are not specifically limited and can be selected according to actual needs.

[0180] In some embodiments, the electrolyte may also optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery properties, such as additives that improve battery overcharge performance, additives that improve battery high temperature performance, and additives that improve battery low temperature power performance.

[0181] For example, the additive includes at least one of a cyclic carbonate compound containing an unsaturated bond, a sulfate compound, a sulfite compound, a sultone compound, a disulfonic acid compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, an acid anhydride, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate ester, and a carboxylate compound.

[0182] It can be understood that when the soft-pack battery cell 21A is a lithium iron phosphate battery cell, in the positive electrode material of the soft-pack battery cell 21A, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0183] For example, when the soft-pack battery cell 21A is a lithium iron phosphate battery cell, the positive electrode active material is LFP (which may refer to LiFePO4, i.e., lithium iron phosphate), the binder may be PVDF (polyvinylidene fluoride), and the conductive agent may be conductive carbon black, wherein LFP:PVDF:conductive carbon black may be 96:2:2, that is, the total weight of the positive electrode active material is 100 parts, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. The weight unit of the positive electrode active material may be grams.

[0184] When the soft-pack battery cell 21A is a ternary battery cell, in the positive electrode material of the soft-pack battery cell 21A, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2-3 parts of the total weight of the positive electrode material (for example, including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1-2 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). Among them, the ternary battery cell can be but not limited to nickel cobalt manganese lithium oxide system, nickel cobalt aluminum oxide lithium oxide system, etc.

[0185] For example, the ternary material of the ternary battery cell can be eight series LiNi 0.8 Co 0.1 Mn 0.1 O 2 The weight ratio of the positive electrode active material, binder and conductive agent is 96:2.5:1.5. That is to say, the total weight of the positive electrode material is divided into 100 parts. 0.8 Co 0.1 Mn 0.1 O 2The proportion is 96 parts, the proportion of adhesive is 2.5 parts, and the proportion of conductive agent is 1.5 parts.

[0186] In some embodiments of the present application, the soft-pack battery cell 21A is a ternary battery cell, and the battery pack 2 includes a U-shaped shell 22, which wraps multiple soft-pack battery cells 21A around three peripheral sides of the multiple soft-pack battery cells 21A of the battery pack 2, and a shell wall of the U-shaped shell 22 arranged opposite to its open end is provided with a pressure relief portion 220.

[0187] In the above technical solution, when the ternary battery cell undergoes thermal runaway expansion and exhaust pressure relief, the pressure relief unit 220 can guide the exhausted gas to directional pressure relief, thereby reducing the risk of the surrounding ternary battery cells being affected by the chaotic flow of gas, and also reducing the risk of serious thermal runaway of the battery pack 2 composed of the ternary battery cells, which is beneficial to the thermal runaway management of the battery pack 2 and improves the reliability of the battery pack 2 composed of the ternary battery cells.

[0188] Exemplarily, the U-shaped shell 22 includes a first shell wall 221, a second shell wall 222 and a third shell wall 223. The first shell wall 221 and the third shell wall 223 are spaced apart and arranged opposite to each other along a first direction. Both ends of the second shell wall 222 are bent to connect the first shell wall 221 and the third shell wall 223, respectively, so that one end of the U-shaped shell 22 in the third direction is formed as an open end 120, the second shell wall 222 is opposite to the open end 120, and the pressure relief portion 220 is arranged on the second shell wall 222.

[0189] In some embodiments of the present application, the pressure relief portion 220 is configured as a pressure relief hole; or, the pressure relief portion 220 is configured as a notch; or, the pressure relief portion 220 is configured as a weakened portion. In the above technical solution, more options can be provided for the design of the pressure relief portion 220 to meet different usage requirements.

[0190] In a second aspect, an embodiment of the present application provides an electrical device 1000 , including the above-mentioned battery device 100 , and the battery device 100 is used to provide electrical energy.

[0191] In the above technical solution, since the power-consuming device 1000 adopts the above-mentioned battery device 100 , the use of the battery device 100 can improve the power consumption reliability of the power-consuming device 1000 .

[0192] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0193] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. 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: include: A battery pack, comprising a plurality of soft-pack battery cells arranged in sequence along a first direction, each of the soft-pack battery cells comprising an electrode assembly and a packaging body, the electrode assembly being provided with a tab, the electrode assembly being encapsulated in the packaging body, a portion of the tab extending from an end of the packaging body in a second direction; A current collecting component is arranged on the side where the pole ear is located; An isolation component is at least partially disposed between the battery pack and the conduit component to separate the packaging body from the conduit component, the isolation component is formed with an escape opening, the tabs of the plurality of soft-pack battery cells pass through the escape opening and are electrically connected to the conduit component, and the first direction is perpendicular to the second direction.

2. The battery device according to claim 1, characterized in that: At least one of the battery pack and the busbar member is fixed to the isolation member.

3. The battery device according to claim 1, characterized in that: The size of the battery pack in the second direction is larger than its size in the first direction and its size in the third direction, the first direction and the second direction are respectively perpendicular to the third direction, and the second direction is taken as the axial direction. The isolation member covers at least one side of the outer circumference of the battery pack; or, The isolation member covers at least one side of the outer circumference of the flow collecting member.

4. The battery device according to claim 1, characterized in that: The isolation component includes a first isolation member and a second isolation member sequentially arranged along the first direction, the first isolation member and the second isolation member are both located between the battery pack and the busbar component, and the escape port is located between the first isolation member and the second isolation member.

5. The battery device according to claim 4, characterized in that: The first isolation member and the second isolation member extend at least to two ends of the battery pack in the first direction, respectively.

6. The battery device according to claim 4, characterized in that: In the first direction, the width of the first isolating member is x1, the width of the second isolating member is x2, x1≥5mm, x2≥5mm; and / or, The thickness of a portion of the isolation member disposed between the battery pack and the current collecting member is t, and 0.5 mm≤t≤1.5 mm.

7. The battery device according to claim 5, characterized in that: The isolation component also includes a third isolation member and a fourth isolation member arranged opposite to each other along the first direction, the third isolation member is bent and connected to one end of the first isolation member away from the second isolation member, the fourth isolation member is bent and connected to one end of the second isolation member away from the first isolation member, and the third isolation member and the fourth isolation member are respectively arranged on both sides of the battery pack in the first direction.

8. The battery device according to claim 4, characterized in that: The isolation component also includes a fifth isolation component and a sixth isolation component arranged opposite to each other along the first direction, the fifth isolation component is bent and connected to one end of the first isolation component away from the second isolation component, the sixth isolation component is bent and connected to one end of the second isolation component away from the first isolation component, and the fifth isolation component and the sixth isolation component are respectively arranged on both sides of the confluence component in the first direction.

9. The battery device according to claim 8, characterized in that: The isolation component also includes a seventh isolation component and an eighth isolation component, and the seventh isolation component and the eighth isolation component are both arranged on the side of the busbar component away from the electrode assembly. The seventh isolation component is bent and connected to the fifth isolation component and is opposite to the first isolation component, and the eighth isolation component is bent and connected to the sixth isolation component and is opposite to the second isolation component.

10. The battery device according to claim 9, characterized in that: The isolation member covers the entire outer periphery of the flow collecting member.

11. The battery device according to claim 1, characterized in that: The isolation component is an integral part or a split part.

12. The battery device according to claim 1, characterized in that: When the energy density ρ of the soft-pack battery cell is greater than 390Wh / L, the melting point T of the isolation component is greater than or equal to 400°C; When the energy density ρ of the soft-pack battery cell is ≤390Wh / L, the melting point of the isolation component is 300°C ≤T<400°C.

13. The battery device according to claim 1, characterized in that: The isolation component is made of high temperature resistant insulating material.

14. The battery device according to claim 13, characterized in that: The isolation component is a ceramic composite material component, a ceramic component, or a Teflon component.

15. The battery device according to claim 1, characterized in that: The battery pack further comprises a U-shaped shell having an installation cavity therein, an opening being formed on a side of the installation cavity corresponding to the location of the pole lug, and at least a portion of the isolation component is disposed between the U-shaped shell and the current collecting component.

16. The battery device according to claim 1, characterized in that: The battery packs are multiple groups and are arranged in sequence along the first direction, and the tabs of each battery pack are electrically connected to the busbar component respectively.

17. The battery device according to claim 1, characterized in that: The battery device also includes a box having a receiving cavity, wherein the battery packs are multiple groups and are arranged in the receiving cavity. The battery device further includes at least one of a first heat exchange member and a second heat exchange member, wherein the at least one of the first heat exchange member and the second heat exchange member is used for heat exchange with the soft pack battery cell. The first heat exchange component is arranged between two adjacent groups of battery packs, and the second heat exchange component is arranged between the battery pack and the box.

18. The battery device according to any one of claims 1 to 17, characterized in that: The soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

19. The battery device according to claim 18, characterized in that: The soft-pack battery cell is a ternary battery cell, and the battery pack further comprises a U-shaped shell, which wraps the multiple soft-pack battery cells around three peripheral sides of the multiple soft-pack battery cells, and a shell wall of the U-shaped shell opposite to its open end is provided with a pressure relief portion.

20. The battery device according to claim 19, characterized in that The pressure relief portion is configured as a pressure relief hole; or, the pressure relief portion is configured as a notch; or, the pressure relief portion is configured as a weakened portion.

21. An electrical device, characterized in that: Comprising a battery device according to any one of claims 1-20.

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