Battery devices and power-consuming devices

Abstract

The present application is applicable to the field of batteries, and proposes a battery device and an electrical device, wherein the battery device comprises a box body, a storage space is provided in the box body, and a gas balance mechanism is provided on the box body; a battery cell assembly is provided in the storage space, and the battery cell assembly comprises a plurality of battery cells arranged in sequence; a buffer device is provided in the storage space, and the buffer device is stacked and arranged with the plurality of battery cells, and the buffer device is provided on the same side of the plurality of battery cells or between the plurality of battery cells, and the buffer device can replace one or more battery cells; a storage cavity is provided in the buffer device, and the storage cavity has an air inlet and an air outlet, the air inlet is connected to the storage space, and the air outlet is used to connect to the gas balance mechanism, so that the discharge of the battery cell can enter the storage cavity through the air inlet and be discharged to the outside of the box body through the air outlet and the gas balance mechanism. The battery device and electrical device provided by the embodiments of the present application improve safety performance.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, how to improve the safety performance of batteries is an important research direction in battery technology. Summary of the invention

[0004] In view of this, embodiments of the present application provide a battery device and an electrical device, which can improve the safety performance of the battery device.

[0005] An embodiment of the first aspect of the present application proposes a battery device, comprising: a box body, a accommodating space is provided in the box body and a gas balancing mechanism is provided on the box body; a battery cell assembly is provided in the accommodating space, the battery cell assembly includes a plurality of battery cells arranged in sequence; a buffer device is provided in the accommodating space, the buffer device is stacked and arranged with the plurality of battery cells, the buffer device is provided on the same side of the plurality of battery cells or between the plurality of battery cells, and the buffer device can replace one or more battery cells; a accommodating cavity is provided in the buffer device, the accommodating cavity has an air inlet and an air outlet, the air inlet is connected to the accommodating space, and the air outlet is used to be connected to the gas balancing mechanism, so that the emissions discharged from the battery cells can enter the accommodating cavity through the air inlet and be discharged to the outside of the box body through the air outlet and the gas balancing mechanism.

[0006] The battery device provided in the above embodiment includes a box, a battery cell assembly and a buffer device arranged in the box. In the case of thermal runaway of one or more battery cells, the battery cells will release emissions into the accommodation space. Since the buffer device is provided with an accommodation cavity and the accommodation cavity has an air inlet connected to the accommodation space, the emissions generated by the battery cells can enter the accommodation cavity from the air inlet and gather in the accommodation cavity for temporary storage; at the same time, since the accommodation cavity also has an air outlet connected to the gas balance mechanism, when the gas balance mechanism is actuated, the emissions in the accommodation cavity can be discharged to the outside of the box through the air outlet and the gas balance mechanism. The battery device can use the accommodation cavity in the buffer device to buffer emissions such as high-temperature gas, so as to reduce the negative impact of emissions generated by the battery cell that has thermal runaway on other battery cells, and reduce the negative impact of emissions generated by the battery cell that has thermal runaway on structural parts in the box such as wiring harnesses, thereby reducing the risk of interlocking reactions caused by thermal runaway of one or several battery cells, reducing the risk of explosion and fire of the battery device as a whole, and improving the safety performance and reliability of the battery device.

[0007] In some embodiments, the buffer device is stacked with the battery cell assembly and can replace one or more battery cells.

[0008] By adopting the above technical solution, the buffer device can replace one or more battery cells. When the capacity of the battery device is changed, there is no need to change the structure of the box, thereby improving production efficiency and reducing the production cost of the battery device.

[0009] In some embodiments, the buffer device includes an outer shell and a partition structure disposed in the outer shell, the outer shell encloses a accommodating cavity, the partition structure divides the accommodating cavity into a plurality of interconnected sub-cavities, at least one sub-cavity is connected to the air inlet, and at least one sub-cavity is connected to the gas balance mechanism.

[0010] By setting up the partition structure, on the one hand, the flow speed of the emissions is slowed down, which is conducive to the accumulation of emissions in the accommodating cavity. On the other hand, when the emissions flow through the partition structure, the partition structure can absorb part of the heat, which is conducive to reducing the temperature of the emissions.

[0011] In some embodiments, the box body includes side walls and a top wall, the side walls are arranged around the top wall, and the gas balance mechanism is arranged on the side walls; an exhaust gap is arranged between the battery cell and the top wall, and the air inlet is connected to the exhaust gap.

[0012] By adopting the above technical solution, an exhaust gap is provided between the battery cell and the top wall. When a battery cell experiences thermal runaway, the emissions generated by the battery cell first impact the top wall. As the air pressure inside the battery device changes, the gas gradually enters the accommodating cavity from the air inlet and gathers, thereby reducing the negative impact of the emissions on other battery cells and structural parts in the box.

[0013] In some embodiments, one end of the housing facing the top wall is opened to form an air inlet, and the air inlet corresponds to and is in communication with the plurality of sub-cavities.

[0014] By adopting the above technical solution, each sub-cavity can be used for gas to flow in, and the gas inlet of the buffer device has a larger size to allow gas to smoothly enter the accommodating cavity. In addition, the gas inlet is arranged toward the top cover, which is conducive to the gas in the exhaust gap to smoothly flow into the gas inlet.

[0015] In some embodiments, the side wall includes a plurality of beams connected in sequence, at least a portion of the beams have a hollow structure inside and form a gas channel, and the accommodating cavity is connected to the gas channel.

[0016] On the one hand, the accommodating cavity and the gas channel can jointly buffer the gas, increasing the overall volume of the gas buffer space; on the other hand, the gas flows from the gas channel into the accommodating cavity, gradually lowering the temperature of the gas in the gas flow path, thereby reducing the impact of the high-temperature gas on the battery device.

[0017] In some embodiments, the shell is fixedly connected to the side wall, and the gas outlet and the gas balancing mechanism are at least partially overlapped.

[0018] By adopting the above technical solution, the shell is connected to the part of the side wall where the gas balance mechanism is provided, the gas outlet can be directly connected to the gas balance mechanism, and when the pressure relief condition is met, the gas can flow smoothly from the gas outlet into the gas balance mechanism.

[0019] In some embodiments, the multiple sub-cavities are multiple first sub-cavities and second sub-cavities, the multiple first sub-cavities are connected in sequence to form an outlet air flow channel; the multiple second sub-cavities are connected in sequence to form a sub-flow channel connected to the outlet air flow channel, and / or the multiple second sub-cavities are respectively connected to the outlet air flow channel.

[0020] By adopting the above technical solution, multiple sub-cavities can form a maze-shaped gas flow path, which reduces the flow speed of the gas in the containing cavity and facilitates the temporary storage of the gas in the containing cavity.

[0021] In some embodiments, the second sub-cavity is located on one side of the outlet flow channel along the first direction, a plurality of first sub-cavities are arranged in sequence along the second direction and the outlet flow channel extends along the second direction, and the first direction intersects the second direction.

[0022] By adopting the above technical solution, a plurality of first sub-cavities form a linear air outlet passage, and the exhaust process of the battery device when releasing pressure is relatively smooth.

[0023] In some embodiments, the separation structure includes a plurality of first reinforcing ribs and a plurality of second reinforcing ribs, the first reinforcing ribs extend along a first direction, and the second reinforcing ribs extend along a second direction; along the second direction, every two adjacent first sub-cavities are separated by first reinforcing ribs and connected by first through holes opened on the first reinforcing ribs; along the first direction, adjacent first sub-cavities and second sub-cavities are separated by second reinforcing ribs and connected by second through holes opened on the second reinforcing ribs.

[0024] By adopting the above technical solution, the first reinforcing rib and the second reinforcing rib can separate a plurality of sub-cavities, and form a gas flow path by setting through holes. The setting method is more flexible, which reduces the processing difficulty of the buffer device.

[0025] In some embodiments, a plurality of first sub-cavities are arranged in at least two rows along a first direction and form at least two parallel outlet air passages, and two adjacent outlet air passages are connected via a third through hole provided on the second reinforcement rib; and / or, a plurality of second sub-cavities are arranged in at least two rows, and at least two rows of the second sub-cavities are respectively arranged on opposite sides of the outlet air passage along the first direction.

[0026] By adopting the above technical solution, the partition structure forms at least two outlet flow channels in the accommodating chamber, which is conducive to rapid exhaust; the partition structure can also form at least two rows of second sub-cavities connected to the outlet flow channels in the accommodating chamber, and the second sub-cavities can be directly or indirectly connected to the outlet flow channels, so that multiple gas flow paths can be formed in the accommodating chamber, which is conducive to caching gas.

[0027] In some embodiments, the buffer device further includes an adsorption material layer disposed in the accommodating cavity, and the adsorption material layer is used to adsorb part of the substances in the emissions.

[0028] By adopting the above technical solution, the adsorption material layer can collect substances to reduce the impact of thermal runaway of battery cells on internal structural parts of the battery device and environmental pollution.

[0029] In some embodiments, the battery device further includes a pressure relief structure, a gas balance mechanism is disposed on the box body, one end of the gas balance mechanism is connected to the gas balance mechanism, and the gas balance mechanism is configured to relieve the internal pressure of the battery device when the internal pressure reaches a threshold.

[0030] In some embodiments, the buffer device has the same shape as the battery cell.

[0031] By adopting the above technical solution, the shape of the buffer device is the same as that of the battery cell, which can facilitate the installation of the buffer device on an empty installation position. After installation, the buffer device can support adjacent battery cells and suppress expansion deformation of adjacent battery cells.

[0032] In some embodiments, multiple battery cells in a battery cell assembly are arranged along a first direction; along the first direction, the ratio of the size of the buffer device to the size of the battery cell ranges from 0.9N to 1.1N, where N is a positive integer; and / or, along the second direction, the ratio of the size of the buffer device to the size of the battery cell ranges from 0.9M to 1.1M, where M is a positive integer, and the second direction intersects with the first direction.

[0033] By adopting the above technical solution, the buffer device can replace the battery cell and occupy the vacant installation position.

[0034] An embodiment of the second aspect of the present application provides an electrical device, including a battery device as in the first aspect, and the battery device is used to store or provide electrical energy.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0038] Figure 2 is a schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0039] Figure 3 is a schematic diagram of an exploded structure of a battery device provided in some embodiments of the present application;

[0040] Figure 4 yes Figure 3 A partial enlarged view of the battery device shown;

[0041] Figure 5 yes Figure 3 A three-dimensional schematic diagram of a buffer device in a battery device shown;

[0042] Figure 6 yes Figure 5 A top view of the buffer device shown;

[0043] Figure 7 yes Figure 6The buffer device is shown in a cross-sectional view along line AA.

[0044] The meanings of the marks in the figure are:

[0045] 1000, vehicle; 100, battery device; 200, motor; 300, controller; 10, box body; 101, accommodating space; 102, gas balance mechanism; 11, side wall; 111, beam body; 12, top wall; 13, bottom wall; 20, battery cell assembly; 21, battery cell; 211, shell; 212, end cover; 213, electrode assembly; 214, electrode terminal; 215, pressure relief mechanism; 30, buffer device; 301, accommodating chamber; 3011, air inlet; 3012, air outlet; 301a, first sub-chamber; 301b, second sub-chamber; 31, shell; 32, partition structure; 321, first reinforcing rib; 3211, first through hole; 322, second reinforcing rib; 3221, second through hole; 3223, third through hole; 33, adsorption material layer. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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, book and the above-mentioned figure descriptions of this application and any variations thereof are intended to cover non-exclusive inclusions.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0052] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0055] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0056] At present, from the perspective of market development, the application of power battery devices is becoming more and more extensive. Power battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery devices, the market demand is also constantly expanding.

[0057] In the development of battery technology, how to improve battery safety performance is an important research direction in battery technology. The battery includes a box and multiple battery cells arranged in the box. When the battery cell has thermal runaway, the battery cell will release high-temperature and high-pressure emissions. Since the battery generally includes multiple battery cells, when a battery cell has thermal runaway, the emissions it discharges will enter the box and cause the temperature and air pressure in the box to rise. At this time, the emissions in the box are likely to have a negative impact on other battery cells, such as causing thermal runaway of other battery cells, thereby generating a chain reaction in the box and causing the battery to catch fire and explode as a whole; at the same time, the emissions will also have a negative impact on other structures in the box, for example, the emissions will affect the fire and short circuit of the wiring harness in the box, or cause the structural parts in the box to deform and catch fire, further exacerbating the risk of overall battery explosion.

[0058] In view of this, an embodiment of the present application provides a battery device, including a box body, a battery cell assembly accommodated in the box body, and a buffer device, the box body is provided with a gas balancing mechanism, and the battery cell assembly includes a plurality of battery cells arranged in sequence; a accommodating cavity is provided in the buffer device, the accommodating cavity has an air inlet and an air outlet, the air inlet is connected with the accommodating space, and the air outlet is used to communicate with the gas balancing mechanism, so that the emissions discharged from the battery cells can enter the accommodating cavity through the air inlet and be discharged to the outside of the box body through the air outlet and the gas balancing mechanism.

[0059] The battery device provided in the above embodiment includes a buffer device. Since a receiving cavity is provided in the buffer device, when one or more battery cells are in thermal runaway, the emissions released by the battery cells can be collected in the receiving cavity for temporary storage and discharged to the outside through the gas balance mechanism. Therefore, when one or more battery cells are in thermal runaway, the battery device can use the receiving cavity in the buffer device to buffer the emissions released by the battery cells, so as to reduce the negative impact of the emissions generated by the battery cells in thermal runaway on other battery cells, and reduce the negative impact of the emissions generated by the battery cells in thermal runaway on the structural parts in the box such as the wiring harness, thereby reducing the risk of interlocking reaction caused by thermal runaway of one or several battery cells, reducing the risk of explosion and fire of the battery device as a whole, and improving the safety and reliability of the battery device.

[0060] The battery device disclosed in the embodiments of the present application can be used in an electrical device that uses the battery device as a power source or various energy storage systems that use the battery device as an energy storage element. The electrical device can 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, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0061] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0062] refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200, and the controller 300 is used to control the battery device 100 to power the motor 200, for example, for starting, navigating and driving the vehicle 1000.

[0063] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0064] refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the exploded structure of a battery cell 21 provided in some embodiments of the present application. Figure 3 Schematic diagram of an exploded structure of a battery device 100 provided in some embodiments of the present application. The battery device (Battery Apparatus) 100 mentioned in the embodiments of the present application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) 20 may include a plurality of battery cells 21, and the plurality of battery cells 21 are connected in series, in parallel, or in mixed connection through a busbar component.

[0065] In some embodiments, the battery cell assembly 20 is generally formed by arranging a plurality of battery cells 21; as an example, the battery cell assembly 20 may be a battery module, which is formed by arranging and fixing a plurality of battery cells 21 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.

[0066] In some embodiments, the battery device 100 may be a battery pack, which includes a case 10 and one or more battery cell assemblies 20 , wherein the battery cell assemblies 20 are accommodated in the case 10 .

[0067] As an example, the battery cell assembly 20 may be a battery module, and the battery cell assembly 20 may be accommodated in the box body 10 by fixing the battery module in the box body 10 .

[0068] As an example, the battery cell assembly 20 may also be accommodated in the case 10 by directly fixing a plurality of battery cells to the case 10 .

[0069] As an example, the box 10 may include an upper box and a lower box. The upper box and the lower box are buckled together to form a closed accommodation space inside the box 10 to accommodate the battery cell assembly 20. The closed here means covered or closed, which can be sealed or unsealed.

[0070] As an example, the box body 10 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed accommodation space is formed inside the box body 10 to accommodate the battery cell assembly 20.

[0071] As an example, the box 10 may be a part of the chassis structure of the vehicle 1000. For example, the roof of the box 10 may become at least a part of the floor of the vehicle 1000, or the frame of the box 10 may become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0072] In some embodiments, the battery device 100 refers to an energy storage device, which includes a box 10, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0073] Please refer to Figure 2 The battery cell 21 is the smallest unit constituting the battery device 100 , and the battery cell 21 includes a housing 211 , an end cover 212 , an electrode assembly 213 and other functional components.

[0074] The end cap 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cap 212 can be adapted to the shape of the shell 211 to match the shell 211. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 212 is not easily deformed when squeezed and collided, so that the battery cell 21 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 214 and pressure relief mechanisms 215 can be provided on the end cap 212. The electrode terminal 214 can be used to electrically connect to the electrode assembly 213 for outputting or inputting electrical energy of the battery cell 21. In some embodiments, the pressure relief mechanism 215 is used to release the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. The material of the end cap 212 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 212 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0075] The shell 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte and other components. The shell 211 and the end cap 212 can be independent components, and an opening can be set on the shell 211, and the internal environment of the battery cell 21 is formed by covering the opening with the end cap 212 at the opening. Without limitation, the end cap 212 and the shell 211 can also be integrated. Specifically, the end cap 212 and the shell 211 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 211, the end cap 212 covers the shell 211. The shell 211 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 213. The shell 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0076] The electrode assembly 213 is a component in the battery cell 21 where electrochemical reactions occur. One or more electrode assemblies 213 may be included in the housing 211. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 213, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery device 100, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals 214 to form a current loop.

[0077] In some embodiments, a pressure relief mechanism 215 is provided on one side of the battery cell 21. The pressure relief mechanism 215 refers to an element or component that is actuated to release the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, the negative electrode plate, the electrolyte and the separator in the battery cell 21. The internal pressure of the battery cell 21 is the pressure inside the housing 211. The pressure relief mechanism 215 can take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell 21 reaches a predetermined threshold, the pressure relief mechanism 215 performs an action or a weak portion provided in the pressure relief mechanism 215 ruptures, thereby forming an opening or channel for internal pressure relief.

[0078] The actuation of the pressure relief mechanism 215 means that the pressure relief mechanism 215 is in motion or activated to a certain state, so that the internal pressure of the battery cell 21 can be released. The action produced by the pressure relief mechanism 215 may include but is not limited to: at least a part of the pressure relief mechanism 215 is broken, shattered, torn or opened, etc. When the pressure relief mechanism 215 is actuated, the high-temperature and high-pressure substances inside the battery cell 21 will be discharged outward from the actuated part as emissions. In this way, the battery cell 21 can be depressurized under controllable pressure, thereby avoiding potential more serious accidents. The emissions from the battery cell 21 mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative pole pieces, fragments of separators, high-temperature and high-pressure gases produced by the reaction, flames, and the like.

[0079] First, refer to Figures 3 to 5An embodiment of the present application provides a battery device 100 , including a box body 10 , a battery cell assembly 20 and a buffer device 30 . A storage space 101 is provided in the box body 10 and a gas balancing mechanism 102 is provided on the box body 10. A battery cell assembly 20 is provided in the storage space 101. The battery cell assembly 20 includes a plurality of battery cells 21 arranged in sequence. A buffer device 30 is provided in the storage space 101. The buffer device 30 and the plurality of battery cells 21 are stacked and arranged. The buffer device 30 is provided on the same side of the plurality of battery cells 21 or between the plurality of battery cells 21. The buffer device 30 can replace one or more battery cells 21. A storage cavity 301 is provided in the buffer device 30. The storage cavity 301 has an air inlet 3011 and an air outlet 3012. The air inlet 3011 is communicated with the storage space 101. The air outlet 3012 is used to communicate with the gas balancing mechanism 102, so that the emissions discharged from the battery cells 21 can enter the storage cavity 301 through the air inlet 3011 and be discharged to the outside of the box body 10 through the air outlet 3012 and the gas balancing mechanism 102.

[0080] The box 10 refers to a structure in the battery device 100 for providing a fixed foundation for the battery cell assembly 20. The box 10 may be prismatic, cylindrical or other shapes; the material of the box 10 may include metal, plastic or other materials.

[0081] The box body 10 is provided with a gas balancing mechanism 102, which can also be called a pressure balancing mechanism. The gas balancing mechanism 102 is provided to balance the pressure inside and outside the battery device 100. The gas balancing mechanism 102 can relieve pressure when a fault such as a short circuit or overcharge occurs in the battery device 100, and discharge the gas inside the box body 10 to the outside of the box body 10, so that the battery device 100 is not easily exploded due to excessive internal pressure, thereby improving the reliability of the battery device 100.

[0082] The gas balance mechanism 102 can be implemented in a variety of ways. The gas balance mechanism 102 can be an explosion-proof valve installed on the box 10, or a balancing valve installed on the box 10. The explosion-proof valve can release pressure and exhaust when the pressure inside the box 10 is too high, and the balancing valve can adjust the pressure balance inside and outside the box 10.

[0083] Optionally, the gas balance mechanism 102 is configured to release the internal pressure of the battery device 100 when the internal pressure reaches a threshold. The threshold of the internal pressure can be set according to the structure of the battery device 100. For example, when the internal pressure of the battery device 100 reaches 4±1 kPa, the gas balance mechanism 102 opens. It is understood that the gas balance mechanism 102 can also release pressure in other situations.

[0084] The number of the gas balancing mechanisms 102 may be one or more. When the number of the gas balancing mechanisms 102 is plural, the number of the buffer devices 30 may also be plural and each buffer device 30 corresponds to a gas balancing mechanism 102 .

[0085] The battery cell assembly 20 includes a plurality of battery cells 21 arranged in sequence. Figure 4 As shown, the plurality of battery cells 21 are arranged along the first direction X, which may be the length direction of the box 10. In other embodiments, the first direction X may also be the width direction of the box 10, or the first direction X may intersect both the length direction and the width direction of the box 10.

[0086] The number of battery cell assemblies 20 may be one or more. When the number of battery cell assemblies 20 is multiple, the multiple battery cell assemblies 20 may be arranged in a row along a first direction X, and the multiple battery cell assemblies 20 may also be arranged in multiple columns along a second direction Y intersecting the first direction X, so that the battery cell assemblies 20 are arranged in an array.

[0087] The shape of the battery cell 21 may be a cuboid, a cylinder or other shapes; in the battery cell assembly 20, the number of the battery cells 21 may be two, or three or more.

[0088] After the battery cell 21 has thermal runaway, the battery cell 21 will release emissions, including high-temperature gas and substances discharged along with the high-temperature gas. In the present application, the emissions include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, separator fragments, high-temperature and high-pressure gas generated by the reaction, flames, etc.

[0089] The buffer device 30 serves as a buffer structure after the battery cell 21 has thermal runaway and before the battery device 100 is vented and depressurized, reducing the risk of thermal runaway. The shape of the buffer device 30 can be a cuboid, a prism, a cylinder or other shapes, and the shape of the buffer device 30 can also be set according to the shape of the battery cell 21. The buffer device 30 is provided with a receiving cavity 301, and the shape of the receiving cavity 301 can be a cuboid, a cylinder or other shapes; for example, the receiving cavity 301 can include a plurality of sub-cavities, or the receiving cavity 301 can also be a hollow cavity.

[0090] The accommodating chamber 301 can accommodate the emissions generated after the thermal runaway of the battery cell 21. The accommodating chamber 301 has an air inlet 3011, which can be oriented toward the upper box body, or toward the battery cell 21 or the beam of the lower box body, as long as the emissions can flow into the accommodating chamber 301.

[0091] The accommodating chamber 301 also has an air outlet 3012, which is used to communicate with the gas balance mechanism 102. For example, if the gas balance mechanism 102 is an explosion-proof valve, the air outlet 3012 is communicated with the explosion-proof valve; for example, if the gas balance mechanism 102 is a structural weak area provided on the box body, the air outlet 3012 can be communicated with the gas balance mechanism 102 after the gas balance mechanism 102 is opened.

[0092] Optionally, the buffer device 30 is opposite to and directly connected to the gas balancing mechanism 102; it is understandable that the buffer device 30 may also be indirectly connected to the gas balancing mechanism 102, for example, there are multiple buffer devices 30, the multiple buffer devices 30 are connected in sequence and the accommodating cavities 301 in the multiple buffer devices 30 are connected, and the gas temporarily stored in the multiple accommodating cavities 301 forms a flow channel and flows to the gas balancing mechanism 102 through the accommodating cavities 301 close to the gas balancing mechanism 102.

[0093] In some embodiments, the buffer device 30 is stacked with the battery cell assembly 20 and can replace one or more battery cells 21 .

[0094] For different electrical devices, especially for different models of the same device, the required capacity of the battery device 100 may be different, and the number of battery cells 21 in the battery device 100 will change with the change in the demand for the capacity of the battery device 100, which causes the structure of the battery device 100 to change accordingly. In particular, after the number of battery cells 21 is reduced, there will be vacant installation positions in the box 10, and the battery cells 21 next to the vacant installation positions may be over-expanded due to lack of constraints; then, the size or structure of the box 10 needs to be changed, and / or the arrangement of the battery cells 21 needs to be changed. Therefore, the change in capacity increases the design and manufacturing cost of the battery device 100. In this embodiment, the buffer device 30 can replace the battery cell 21. When the capacity of the battery device 100 becomes smaller, the buffer device 30 can occupy the vacant installation position formed by the reduction in the number of battery cells 21, and the buffer device 30 can play an expansion constraint role on the battery cells 21 on its adjacent side.

[0095] In the battery device 100, the number of the buffer device 30 can be one or more. The buffer device 30 is stacked and arranged with the battery cell assembly 20, wherein the buffer device 30 can be arranged on the same side of multiple battery cells 21, and can also be arranged between any two adjacent battery cells 21. The buffer device 30 is in contact with at least one battery cell 21, and the buffer device 30 can support the adjacent battery cells 21 and can inhibit the excessive expansion of the battery cells 21. The number of battery cell assemblies 20 is one or more groups. When the number of battery cell assemblies 20 is multiple groups, at least one group of battery cell assemblies 20 is stacked and arranged with the buffer device 30. For example, as Figure 3As shown, the buffer device 30 and two groups of battery cell assemblies 20 are stacked and arranged.

[0096] The buffer device 30 can be used as a universal component in battery devices 100 of different vehicle models under the same platform or of different capacities in the same vehicle model.

[0097] Exemplarily, for battery devices 100 of different capacities, a battery device 100 of larger capacity is provided with P battery cells 21 arranged along the first direction X in the box 10, and a battery device 100 of smaller capacity is provided with Q battery cells 21 arranged along the first direction X in the box 10, where P is greater than Q. A buffer device 30 can be used to replace only one battery cell 21, in which case the outer dimensions of the buffer device 30 are similar to those of one battery cell 21, and the number of buffer devices 30 is the difference between P and Q. A buffer device 30 can also be used to replace two or more battery cells 21, in which case the outer dimensions of the buffer device 30 can be an integer multiple of the outer dimensions of the battery cell 21, or the outer dimensions of the buffer device 30 can also be close to the integer multiple of the outer dimensions of the battery cell 21. Similarly, a buffer device 30 can also be used to replace one or more battery cells 21 arranged along the second direction Y, or a buffer device 30 can simultaneously replace multiple battery cells 21 arranged along the first direction X and the second direction Y.

[0098] The battery device 100 provided in the above embodiment includes a case 10, a battery cell assembly 20 and a buffer device 30 arranged in the case 10. In the event that thermal runaway occurs in one or more battery cells 21, the battery cells 21 will leak emissions into the accommodating space 101. Since a accommodating chamber 301 is provided in the buffer device 30 and the accommodating chamber 301 has an air inlet connected to the accommodating space 101, emissions generated by the battery cells 21 can enter the accommodating chamber 301 from the air inlet 3011 and gather in the accommodating chamber 301 for temporary storage. At the same time, since the accommodating chamber 301 also has an air outlet 3012 connected to the gas balancing mechanism, when the gas balancing mechanism is actuated, the emissions in the accommodating chamber 301 can be discharged to the outside of the case 10 through the air outlet 3012 and the gas balancing mechanism 102.

[0099] Therefore, the battery device 100 provided in the embodiment of the present application can utilize the accommodating cavity 301 in the buffer device 30 to buffer emissions such as high-temperature gases, so as to reduce the negative impact of emissions generated by the battery cell 21 that has thermal runaway on other battery cells 21, and reduce the negative impact of emissions generated by the battery cell 21 that has thermal runaway on structural parts in the box 10 such as the wiring harness, thereby reducing the risk of interlocking reactions caused by thermal runaway of one or several battery cells 21, reducing the risk of explosion and fire of the battery device 100 as a whole, and improving the safety performance of the battery device 100. At the same time, the buffer device 30 is stacked and arranged with the battery cell assembly 20, and the buffer device 30 can replace one or more battery cells 21. When the capacity of the battery device 100 is changed, there is no need to change the structure of the box 10, thereby improving production efficiency and reducing the production cost of the battery device 100. The buffer device 30 can not only buffer the emissions generated by the battery cell 21 after thermal runaway, but also replace the battery cell 21. The provision of the buffer device 30 will not increase the size of the battery device 100. Please refer to Figures 4 to 7 In some embodiments, the buffer device 30 includes a shell 31 and a partition structure 32 disposed in the shell 31, the shell 31 encloses a accommodating chamber 301, the partition structure 32 divides the accommodating chamber 301 into a plurality of interconnected sub-chambers, at least one sub-chamber is connected to the gas inlet 3011, and at least one sub-chamber is connected to the gas balance mechanism 102.

[0100] The outer shell 31 is the shell of the buffer device 30, and the inner wall of the outer shell 31 is used to enclose the accommodating cavity 301; the outer shell 31 can be made of thermoplastic materials, metals, foam ceramics and other materials, and is made by injection molding, pultrusion molding, machining and other processes. The buffer device 30 is fixed in the box body 10 through the outer shell 31, for example, the outer shell 31 is bonded to the bottom of the box body 10 and / or the beam body 111 through colloid.

[0101] The air inlet 3011 and the air outlet 3012 are provided on the housing 31. The number of the air inlet 3011 and the air outlet 3012 can be one or more. The air inlet 3011 can be an opening on one side of the housing 31 or a through hole penetrating the housing 31. The air outlet 3012 can be directly connected to the gas balance mechanism 102 or indirectly connected to the gas balance mechanism 102.

[0102] The partition structure 32 may be integrally formed with the housing 31, or may be fixedly connected by welding or the like. The partition structure 32 may include one or more structures such as reinforcing ribs and baffles that can separate spaces. The partition structure 32 is used to divide the accommodating chamber 301 into a plurality of interconnected sub-chambers, and the high-temperature and high-pressure gas in the exhaust can flow in the plurality of sub-chambers and be discharged from the gas outlet 3012. The plurality of sub-chambers are interconnected, which means that each sub-chamber is directly connected to at least one of the other sub-chambers.

[0103] By adopting the above technical solution, the shell 31 encloses the accommodating chamber 301, and the partition structure 32 divides the accommodating chamber 301 into a plurality of interconnected sub-chambers. The high-temperature and high-pressure gas in the exhaust can enter the accommodating chamber 301 from the gas inlet 3011 and flow in the plurality of sub-chambers, and finally flow into the gas balancing mechanism 102 from the gas outlet 3012; by setting the partition structure 32, on the one hand, the flow speed of the gas is slowed down, which is conducive to the gathering of the gas in the accommodating chamber 301, and on the other hand, when the gas flows through the partition structure 32, the partition structure 32 can absorb part of the heat, which is conducive to reducing the temperature of the gas.

[0104] Please refer to Figures 3 to 5 In some embodiments, the box body 10 includes a side wall 11 and a top wall 12, the side wall 11 is arranged around the top wall 12, and the gas balance mechanism 102 is arranged on the side wall 11; an exhaust gap is provided between the battery cell 21 and the top wall 12, and the air inlet 3011 is connected to the exhaust gap.

[0105] The box body 10 includes a side wall 11 and a top wall 12. The side wall 11 is arranged around the top wall 12 to form a storage space for accommodating the battery cell assembly 20 and the buffer device 30. The box body 10 may also include a bottom wall 13 arranged opposite to the top wall 12.

[0106] In some embodiments, the box body 10 includes an upper box body 10 and a lower box body 10, the side wall 11 is a side frame portion of the lower box body 10, and the top wall 12 is the upper box body 10. In other embodiments, the side wall 11 and the top wall 12 may also be integrally connected.

[0107] The gas balancing mechanism 102 is disposed on the side wall 11 . For example, the gas balancing mechanism 102 is disposed on the long side of the side wall 11 . It is understandable that the gas balancing mechanism 102 may also be disposed on the short side of the side wall 11 .

[0108] An exhaust gap is provided between the battery cell 21 and the top wall 12, and the emissions generated after the thermal runaway of the battery cell 21 can enter the exhaust gap; the air inlet 3011 of the buffer device 30 is connected to the exhaust gap, so that the emissions in the exhaust gap can flow from the air inlet 3011 into the accommodating cavity 301. Optionally, a pressure relief mechanism 215 is provided on the battery cell 21, and the pressure relief mechanism 215 is arranged toward the top wall 12, so that the battery cell 21 releases emissions from the explosion-proof valve, and the emissions can directly enter the exhaust gap.

[0109] By adopting the above technical solution, an exhaust gap is provided between the battery cell 21 and the top wall 12. When a battery cell 21 experiences thermal runaway, the emissions generated by the battery cell 21 first impact the top wall 12. As the air pressure inside the battery device changes, the gas gradually enters the accommodating cavity 301 from the air inlet 3011 and gathers, thereby reducing the negative impact of the emissions on other battery cells 21 and the structural parts in the box body 10.

[0110] like Figures 3 to 5 As shown, in some embodiments, the housing 31 is opened at one end toward the top wall 12 to form an air inlet 3011 , and the air inlet 3011 corresponds to and communicates with the plurality of sub-cavities.

[0111] The air inlet 3011 is an opening formed at one end of the housing 31. The air inlet 3011 corresponds to and communicates with multiple sub-cavities at the same time, so that each sub-cavity can be used for gas to flow in. The air inlet 3011 of the buffer device 30 has a large size to allow gas to smoothly enter the accommodating cavity 301. In addition, the air inlet 3011 is arranged toward the top cover, which is conducive to the gas in the exhaust gap flowing smoothly into the air inlet 3011.

[0112] In another embodiment, the air inlet 3011 may also be opened on the side of the housing 31 facing the side wall 11 , or the air inlet 3011 may also be set on the side of the housing 31 facing the battery cell assembly 20 .

[0113] In some embodiments, the side wall 11 includes a plurality of beam bodies 111 connected in sequence, at least a portion of the beam bodies 111 have a hollow structure inside and form a gas channel, and the accommodating cavity 301 is connected to the gas channel.

[0114] The beam body 111 may be a profile member with a hollow structure, a gas channel is formed inside the beam body 111, and a gas hole connected to the gas channel is also provided on the beam body 111, and the gas hole is configured to allow gas to flow, and each beam body 111 may be provided with one or more gas holes. There is a gap between the beam body 111 and the battery cell assembly 20 near the beam body 111, and the gas hole faces the battery cell assembly 20, so that gas can flow into the gas hole from the gap between the beam body 111 and the battery cell assembly 20.

[0115] Optionally, the side wall 11 includes two first beams extending along a first direction and two second beams extending along a second direction, the second direction intersects with the first direction, and at least one of the first beam and the second beam is a hollow structure; further, both the first beam and the second beam can be hollow structures and are interconnected.

[0116] The accommodating cavity 301 is connected to the gas channel in the beam body 111, so that the gas generated by the thermal runaway of the battery cell 21 can flow into the gas channel in the beam body 111, then flow to the accommodating cavity 301 through the gas channel, and finally flow out from the gas balance mechanism 102. On the one hand, the accommodating cavity 301 and the gas channel can buffer the gas together, increasing the overall volume of the gas buffer space; on the other hand, the gas flows from the gas channel into the accommodating cavity 301, gradually lowering the temperature of the gas in the gas flow path, reducing the impact of the high-temperature gas on the battery device.

[0117] Please refer to Figure 4 and Figure 5 In some embodiments, the housing 31 is fixedly connected to the side wall 11 , and the gas outlet 3012 and the gas balancing mechanism 102 are at least partially overlapped.

[0118] The housing 31 is fixedly connected to the side wall 11, and the gas outlet 3012 is provided on the side of the housing 31 facing the gas balance mechanism 102; optionally, the side wall 11 includes a plurality of beams 111 connected in sequence, and the beams 111 can be called side beams, and the housing 31 is fixedly connected to the beams 111. In some embodiments, the side surface of the housing 31 is connected to the beams 111, and the bottom surface of the housing 31 is connected to the bottom of the box body 10.

[0119] The gas outlet 3012 is opposite to the gas balance mechanism 102, and along the extension direction of the shell 31, the orthographic projection of the gas outlet 3012 on the gas balance mechanism 102 covers at least a portion of the gas balance mechanism 102. In this way, the shell 31 is connected to the portion of the side wall 11 where the gas balance mechanism 102 is provided, and the gas outlet 3012 can be directly connected to the gas balance mechanism 102. When the pressure relief condition is met, the gas can smoothly flow from the gas outlet 3012 into the gas balance mechanism 102.

[0120] Please refer to Figures 5 to 7 In some embodiments, the multiple sub-cavities include multiple first sub-cavities 301a and multiple second sub-cavities 301b, the multiple first sub-cavities 301a are connected in sequence to form an outlet flow channel connected to the outlet port 3012; the multiple second sub-cavities 301b are connected in sequence to form a sub-flow channel connected to the outlet flow channel, and / or the multiple second sub-cavities 301b are respectively connected to the outlet flow channels.

[0121] For ease of understanding, the present application sets the sub-cavity that forms the outlet flow channel as the first sub-cavity 301a, and sets the other sub-cavities as the second sub-cavity 301b. Figure 7 The arrows in the figure indicate the direction of gas flow.

[0122] The plurality of first sub-cavities 301a are connected in sequence to form an outlet flow channel, and the gas outlet 3012 is provided in the first sub-cavity 301a close to the gas balance mechanism 102. For example, the plurality of first sub-cavities 301a are arranged along the second direction, and the outlet flow channel is a straight-line flow channel extending along the second direction; in other embodiments, the outlet flow channel may also be in a folded line shape or a curved line shape.

[0123] For example, each second sub-cavity 301b is connected to the outlet flow channel, and specifically, each second sub-cavity 301b is connected to an adjacent first sub-cavity 301a. In other embodiments, multiple second sub-cavities 301b can also be connected in sequence to form a sub-flow channel, and the end of the sub-flow channel is connected to the outlet flow channel.

[0124] In the buffer device 30 provided in the embodiment of the present application, the multiple sub-cavities form at least one outlet flow channel so that the gas gathered in the multiple sub-cavities can be smoothly discharged to the gas balancing mechanism 102 through the outlet flow channel; the multiple sub-cavities can form a maze-shaped gas flow path, which reduces the flow speed of the gas in the containing cavity 301 and is conducive to the temporary storage of the gas in the containing cavity 301.

[0125] In some embodiments, the second sub-cavity 301b is located on one side of the outlet channel along the first direction X, the plurality of first sub-cavities 301a are arranged in sequence along the second direction Y and the outlet channel extends along the second direction Y, and the first direction X and the second direction Y intersect.

[0126] Optionally, the gas balancing mechanism 102 is located on one side of the box body 10 along the second direction Y, and the gas outlet passage also extends along the second direction Y.

[0127] In this way, the plurality of first sub-cavities 301 a form a linear outlet air passage, and the exhaust process of the battery device 100 when releasing pressure is relatively smooth.

[0128] In other embodiments, if the gas balancing mechanism 102 is located at one side of the box body 10 along the first direction X, the outlet gas passage may also extend along the first direction X.

[0129] In some embodiments, the partition structure 32 includes a plurality of first reinforcing ribs 321 and a plurality of second reinforcing ribs 322, the first reinforcing ribs 321 extend along the first direction X, the second reinforcing ribs 322 extend along the second direction, and along the second direction Y, every two adjacent first sub-cavities 301a are separated by the first reinforcing ribs 321 and connected by the first through holes 3211 provided on the first reinforcing ribs 321; along the first direction X, the adjacent first sub-cavities 301a and the second sub-cavities 301b are separated by the second reinforcing ribs 322 and connected by the second through holes 3221 provided on the second reinforcing ribs 322.

[0130] The first reinforcing rib 321 and the second reinforcing rib 322 can improve the structural strength of the buffer device 30 and reduce the risk of deformation of the buffer device 30; the buffer device 30 is stacked with the battery cell assembly 20 and can replace the battery cell 21. The buffer device 30 can support the adjacent battery cell 21 and reduce the probability of excessive expansion of the battery cell 21. By providing the first reinforcing rib 321 and the second reinforcing rib 322, the supporting effect of the buffer device 30 on the battery cell assembly 20 is further improved.

[0131] The first reinforcing rib 321 extends along the first direction, and the two ends of the first reinforcing rib 321 are respectively connected to the two inner walls of the outer shell 31 along the first direction. The second reinforcing rib 322 extends along the second direction, the second direction intersects with the first direction, and the two ends of the second reinforcing rib 322 are respectively connected to the two inner walls of the outer shell 31 along the second direction; optionally, the first reinforcing rib 321 and the second reinforcing rib 322 are also respectively connected to the bottom surface of the outer shell 31.

[0132] It can be understood that the first reinforcing rib 321 or the second reinforcing rib 322 can also be spaced apart from the bottom surface of the shell 31 .

[0133] It can be understood that the second reinforcing rib 322 and the first reinforcing rib 321 can intersect vertically or obliquely. In addition, the second reinforcing rib 322 and / or the first reinforcing rib 321 can also be arranged to be inclined relative to the first direction.

[0134] The number of the first reinforcing ribs 321 and the number of the second reinforcing ribs 322 are both multiple, and the multiple first reinforcing ribs 321 are arranged in parallel and spaced apart, and the multiple second reinforcing ribs 322 are arranged in parallel and spaced apart; the extension direction of the first reinforcing ribs 321 and the second reinforcing ribs 322 intersect, thereby dividing the accommodating cavity 301 into multiple sub-cavities arranged in an array. It can be understood that the first reinforcing ribs 321 and / or the second reinforcing ribs 322 can realize the mutual communication between the sub-cavities by setting through holes, or the first reinforcing ribs 321 and / or the second reinforcing ribs 322 can also realize the mutual communication between the sub-cavities by forming gaps with the shell 31.

[0135] For example, along the second direction Y, the first reinforcing rib 321 separates two adjacent first sub-cavities 301a, and the first reinforcing rib 321 is provided with a first through hole 3211 connecting the two adjacent first sub-cavities 301a, so that multiple first sub-cavities 301a are connected in sequence to form an outlet flow channel, optionally, the first through hole 3211 is close to the side of the first reinforcing rib 321 away from the outlet, that is, the first through hole 3211 is close to the bottom wall 13 of the outer shell 31, so that the discharge can fill the first sub-cavity 301a and flow along the outlet flow channel.

[0136] Along the first direction X, the second reinforcing rib 322 separates the first sub-cavity 301a and the second sub-cavity 301b, and the second reinforcing rib 322 is provided with a second through hole 3221 connecting the adjacent first sub-cavity 301a and the second sub-cavity 301b, and the second through hole 3221 is configured to allow the gas in the second sub-cavity 301b to flow to the first sub-cavity 301a.

[0137] The shapes of the first through hole 3211 and the second through hole 3221 can be circular, rectangular, elliptical, etc. For example, the first through hole 3211 is rectangular, and the second through hole 3221 is a circular hole. The flow area of ​​the first through hole 3211 is larger than the flow area of ​​the second through hole 3221, so as to facilitate rapid exhaust when the battery device is depressurized.

[0138] The partition structure 32 provided in the embodiment of the present application includes a plurality of first reinforcing ribs 321 and a plurality of second reinforcing ribs 322, which improve the overall structural strength of the buffer device 30 and the supporting effect of the buffer device 30 on the battery cell assembly 20; at the same time, the extension directions of the first reinforcing ribs 321 and the second reinforcing ribs 322 intersect and divide the accommodating cavity 301 into a plurality of sub-cavities arranged in an array, and the first reinforcing ribs 321 and the second reinforcing ribs 322 can absorb the heat of the emissions and slow down the flow rate of the emissions, which is conducive to the accumulation of emissions in the accommodating cavity 301.

[0139] In some embodiments, a plurality of first sub-cavities 301a are arranged in at least two rows along the first direction X and form at least two parallel outlet air passages, and two adjacent outlet air passages are connected via a third through hole 3223 provided on the second reinforcing rib 322; and / or, a plurality of second sub-cavities 301b are arranged in at least two rows, and at least two rows of second sub-cavities 301b are respectively arranged on opposite sides of the outlet air passage along the first direction X.

[0140] For example, a plurality of first sub-cavities 301a are arranged in two rows along the first direction X, and each row of first sub-cavities 301a is sequentially arranged along the second direction Y to form an outlet flow channel extending along the second direction Y, and the two outlet flow channels are separated by the second reinforcing rib 322 and connected through the third through hole 3223. In this way, the gas can flow between the two outlet flow channels. Furthermore, the first sub-cavities 301a at the ends of the two outlet flow channels are directly connected to the gas balance mechanism 102. It can be understood that only the first sub-cavity 301a at the end of one outlet flow channel can be directly connected to the gas balance mechanism 102.

[0141] For example, the plurality of second sub-cavities 301 b are arranged in two rows, and the two rows of second sub-cavities 301 b are respectively disposed at two opposite sides of the two outlet flow channels along the first direction X.

[0142] By adopting the above technical solution, the partition structure 32 forms at least two outlet flow channels in the accommodating chamber 301, which is conducive to rapid exhaust; the partition structure 32 can also form at least two rows of second sub-cavities 301b connected to the outlet flow channels in the accommodating chamber 301, and the second sub-cavities 301b can be directly or indirectly connected to the outlet flow channels, and multiple gas flow paths can be formed in the accommodating chamber 301, which is conducive to caching gas.

[0143] like Figure 7 As shown, in some embodiments, the buffer device 30 further includes an adsorption material layer 33 disposed in the accommodating cavity 301 , and the adsorption material layer 33 is used to adsorb part of the substances in the emissions.

[0144] The adsorption material layer 33 refers to a structure made of a material with adsorption capacity. The adsorption material layer 33 may be made of adsorption materials such as activated carbon and molecular sieves, or may include alkaline absorbents. The adsorption material layer 33 can collect some substances (especially harmful substances) in the discharge of the battery cell 21. In other embodiments, the adsorption material layer 33 may also be made of other materials with adsorption capacity.

[0145] The adsorption material layer 33 may be disposed on the bottom surface of the housing 31, the inner side surface of the housing 31, the surface of the partition structure 32, etc. Figure 7 As shown, the adsorption material layer 33 is disposed on the bottom surface of the housing 31 . When the emissions are collected in the accommodating cavity 301 , the adsorption material layer 33 can adsorb some substances in the emissions.

[0146] When the battery cell 21 thermally runs away, the battery cell 21 will release high-temperature electrolyte vapor and harmful gases such as sulfur dioxide and carbon monoxide. By setting an adsorption material layer 33 in the accommodating cavity 301, the adsorption material layer 33 can collect some substances in the emissions to reduce the impact of the thermal runaway of the battery cell 21 on the internal structural components of the battery device 100 and the pollution of the environment.

[0147] Please refer to Figures 2 to 5 In some embodiments, the shape of the buffer device 30 is the same as the shape of the battery cell 21 .

[0148] The buffer device 30 and the battery cell 21 have the same shape, which means that the buffer device 30 and the battery cell 21 have the same or substantially the same geometric shape, or may also mean that the buffer device 30 and the battery cell 21 have the same or substantially the same outer contour. For example, if the battery cell 21 has a rectangular parallelepiped shape, the buffer device 30 also has a rectangular parallelepiped shape; for example, if the battery cell 21 has a cylindrical shape, the buffer device 30 also has a cylindrical shape.

[0149] For example, the shape of the battery cell 21 depends on the shape of the shell 211, and the shape of the buffer device 30 depends on the shape of the shell 31. The shell 31 has the same shape as the shell 211, and the buffer device 30 is not provided with a structure similar to the electrode terminal 214, the pressure relief mechanism 215 and the like.

[0150] When the shape of the buffer device 30 is the same as that of the battery cell 21, the size of the buffer device 30 is equal to or proportional to the size of the battery cell 21; due to the influence of processing technology, etc., there may be errors in the processing of the buffer device 30. At this time, the shape of the buffer device 30 and the shape of the battery cell 21 can be roughly the same, and the size of the buffer device 30 and the size of the battery cell 21 may not be completely the same or completely proportional.

[0151] For example, when the battery cell 21 is a square shell battery cell, the buffer device 30 is a rectangular parallelepiped structure; at this time, the length, width and height of the buffer device 30 are equal to the length, width and height of the battery cell 21, or the length, width and height of the buffer device 30 are equal in proportion to the corresponding length, width and height of the battery cell 21.

[0152] For example, when the battery cell 21 is a cylindrical battery cell, the buffer device 30 is a cylindrical structure; at this time, the height and radius of the buffer device 30 are equal to the height and radius of the battery cell 21, or the height and radius of the buffer device 30 are equal in ratio to the corresponding height and radius of the battery cell 21.

[0153] When the number of battery cells 21 is reduced to lower the capacity of the battery device 100 , the shape of the buffer device 30 is made the same as that of the battery cells 21 , so that the buffer device 30 can be easily installed in an empty installation position. After installation, the buffer device 30 can support adjacent battery cells 21 and suppress expansion deformation of adjacent battery cells 21 .

[0154] Please refer to Figure 3 In some embodiments, a plurality of battery cells 21 and a buffer device 30 are arranged along a first direction; along the first direction X, a ratio of a size of the buffer device 30 to a size of the battery cell 21 ranges from 0.9N to 1.1N, where N is a positive integer; and / or, along a second direction, a ratio of a size of the buffer device 30 to a size of the battery cell 21 ranges from 0.9M to 1.1M, where M is a positive integer, and the second direction intersects the first direction.

[0155] like Figure 3 As shown, the first direction X is the arrangement direction of the plurality of battery cells 21 in the battery cell assembly 20 , and the first direction X may be the width direction of the battery cells 21 .

[0156] For example, in the first direction X, the ratio of the size of the buffer device 30 to the size of the battery cell 21 can be 0.9. At this time, the size of the buffer device 30 in the first direction X is smaller than the battery cell 21. This setting can reduce the difficulty of placing the buffer device 30 into an empty installation position, thereby reducing the difficulty of installing the buffer device 30; at the same time, it can also reduce the squeezing of the battery cell 21 by the buffer device 30.

[0157] For example, in the first direction X, the ratio of the size of the buffer device 30 to the size of the battery cell 21 can be 1.0. In this case, the size of the buffer device 30 in the first direction X is equal to the battery cell 21, and the buffer device 30 can better replace the battery cell 21, so that the battery cell 21 and the buffer device 30 form a battery cell assembly 20 and are loaded into the box body 10; at the same time, the equal size of the buffer device 30 and the battery cell 21 in the first direction X also enables the buffer device 30 to provide support for other adjacent battery cells 21 in the same way as the battery cell 21.

[0158] For example, in the first direction X, the ratio of the size of the buffer device 30 to the size of the battery cell 21 can be 1.1. At this time, the size of the buffer device 30 in the first direction X is larger than the battery cell 21. The buffer device 30 can better provide support for adjacent battery cells 21 and better suppress the expansion deformation of adjacent battery cells 21 in the first direction X.

[0159] For example, the size of the buffer device 30 may also be set according to an integer multiple of the size of the battery cell 21 to replace a plurality of battery cells 21. In this case, N≥2.

[0160] For example, N=2, and one buffer device 30 can replace two battery cells 21 along the first direction X.

[0161] For example, N=3, and one buffer device 30 can replace three battery cells 21 along the first direction Y.

[0162] In the case where a separator is provided between adjacent battery cells 21 , the buffer device 30 may also replace the thickness of N battery cells 21 and N−1 separators.

[0163] By adopting the above technical solution, the buffer device 30 has the same or similar size as one or more battery cells 21 in the first direction X, so that the buffer device 30 can replace the battery cell 21 and occupy the vacant installation position.

[0164] Along the second direction Y, the ratio of the size of the buffer device 30 to the size of the battery cell 21 ranges from 0.9M to 1.1M, and the second direction intersects with the first direction.

[0165] The second direction Y may be perpendicular to the first direction X, or may intersect at other angles, and the second direction may be the length direction of the battery cell 21. For example, along the second direction Y, the ratio of the size of the buffer device 30 to the size of the battery cell 21 may be 0.9, 0.95, 1.0, 1.05, 1.1 or other values.

[0166] For example, in the second direction Y, the ratio of the size of the buffer device 30 to the size of the battery cell 21 can be 0.9. At this time, the size of the buffer device 30 in the second direction Y is smaller than the battery cell 21. This setting can reduce the difficulty of placing the buffer device 30 into an empty installation position, so as to reduce the difficulty of installing the buffer device 30; at the same time, it can also reduce the squeezing of the battery cell 21 by the buffer device 30.

[0167] For example, in the second direction Y, the ratio of the size of the buffer device 30 to the size of the battery cell 21 can be 1.0. At this time, the size of the buffer device 30 in the second direction Y is equal to the battery cell 21, and the buffer device 30 can better replace the battery cell 21, so that the battery cell 21 and the buffer device 30 form a battery cell assembly and are loaded into the box body 10; at the same time, the equal size of the buffer device 30 and the battery cell 21 in the second direction Y also enables the buffer device 30 to provide support for other adjacent battery cells 21 in the same way as the battery cell 21.

[0168] For example, in the second direction Y, the ratio of the size of the buffer device 30 to the size of the battery cell 21 may be 1.1. In this case, the size of the buffer device 30 in the second direction Y is larger than the battery cell 21 , and the buffer device 30 can better provide support for adjacent battery cells 21 .

[0169] For example, M=2, and one buffer device 30 can replace two battery cells 21 along the second direction Y.

[0170] For example, M=3, and one buffer device 30 can replace three battery cells 21 along the second direction Y.

[0171] By adopting the above technical solution, the buffer device 30 and the battery cell 21 have equal or similar sizes in the second direction Y, which facilitates the replacement of one or more battery cells 21, reduces the difficulty of installing the buffer device 30, and reduces the space occupied by the buffer device 30 in the second direction Y.

[0172] Please refer to Figures 3 to 7Some embodiments of the present application provide a battery device 100, including a box body 10, a battery cell assembly 20 accommodated in the box body 10, and a buffer device 30, the box body 10 is provided with a gas balance mechanism 102, the battery cell assembly 20 includes a plurality of battery cells 21 arranged in sequence; the buffer device 30 is stacked and arranged with the battery cells 21, and the buffer device 30 is used to replace the battery cells 21; a accommodating cavity 301 is provided in the buffer device 30, the accommodating cavity 301 has an air inlet 3011 and an air outlet 3012, the air inlet 3011 is connected with the accommodating space 101, and the air outlet 3012 is used to communicate with the gas balance mechanism, so that the emissions discharged from the battery cells 21 can enter the accommodating cavity 301 through the air inlet 3011 and be discharged to the outside of the box body 10 through the air outlet 3012 and the gas balance mechanism 102. The buffer device 30 includes a shell 31 and a partition structure 32 disposed in the shell 31 . The shell 31 encloses a receiving cavity 301 , and the partition structure 32 divides the receiving cavity 301 into a plurality of sub-cavities that are interconnected.

[0173] The battery device 100 provided in the embodiment of the present application includes a buffer device 30. When one or more battery cells 21 experience thermal runaway, the battery device 100 can utilize the accommodating cavity 301 in the buffer device 30 to buffer emissions from the battery cells 21, thereby reducing the negative impact of emissions on other battery cells 21 and structural parts, and improving the safety performance and reliability of the battery device 100.

[0174] In a second aspect, some embodiments of the present application further provide an electrical device, including the battery device 100 provided by some embodiments of the first aspect, and the battery device 100 is used to store or provide electrical energy.

[0175] The electrical device may be a vehicle 1000, or may be a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, a ship, a spacecraft, and the like.

[0176] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A box body, wherein a containing space is provided in the box body and a gas balancing mechanism is provided on the box body; A battery cell assembly is disposed in the accommodation space, wherein the battery cell assembly includes a plurality of battery cells arranged in sequence; A buffer device is arranged in the accommodation space, the buffer device is stacked and arranged with the plurality of battery monomers, the buffer device is arranged on the same side of the plurality of battery monomers or between the plurality of battery monomers, and the buffer device can replace one or more of the battery monomers; a accommodating cavity is provided in the buffer device, the accommodating cavity can accommodate the emissions generated by the battery monomers, the accommodating cavity has an air inlet and an air outlet, the air inlet is connected to the accommodation space, and the air outlet is used to communicate with the gas balancing mechanism, so that the emissions discharged by the battery monomers can enter the accommodating cavity through the air inlet and be discharged to the outside of the box through the air outlet and the gas balancing mechanism; The buffer device includes an outer shell and a partition structure arranged in the outer shell, the outer shell encloses the accommodating cavity, and the partition structure divides the accommodating cavity into a plurality of sub-cavities interconnected with each other; one end of the outer shell is opened to form the air inlet, and the air inlet corresponds to and is connected with a plurality of the sub-cavities at the same time, and at least one of the sub-cavities is connected with the gas balancing mechanism.

2. The battery device according to claim 1, characterized in that The box body includes a side wall and a top wall, the side wall is arranged around the circumference of the top wall, and the gas balance mechanism is arranged on the side wall; An exhaust gap is provided between the battery cell and the top wall, and the air inlet is communicated with the exhaust gap.

3. The battery device according to claim 2, characterized in that: The side wall includes a plurality of beam bodies connected in sequence, at least a portion of the beam bodies have a hollow structure inside and form a gas channel, and the accommodating cavity is connected to the gas channel.

4. The battery device according to claim 2, characterized in that: The shell is fixedly connected to the side wall, and the gas outlet is at least partially overlapped with the gas balancing mechanism.

5. The battery device according to claim 1, wherein: The plurality of sub-cavities include a plurality of first sub-cavities and a second sub-cavity, the plurality of first sub-cavities are sequentially connected to form an outlet flow channel, and the outlet flow channel is used to communicate with the gas balancing mechanism; The plurality of second sub-cavities are sequentially connected to form a sub-flow channel connected to the outlet flow channel, and / or the plurality of second sub-cavities are respectively connected to the outlet flow channel.

6. The battery device according to claim 5, characterized in that The second sub-cavity is located at one side of the outlet flow channel along the first direction, a plurality of the first sub-cavities are arranged in sequence along the second direction and the outlet flow channel extends along the second direction, and the first direction intersects with the second direction.

7. The battery device according to claim 6, characterized in that: The partition structure includes a plurality of first reinforcing ribs and a plurality of second reinforcing ribs, wherein the first reinforcing ribs extend along the first direction, and the second reinforcing ribs extend along the second direction; Along the second direction, every two adjacent first sub-cavities are separated by the first reinforcing rib and are connected through a first through hole provided on the first reinforcing rib; Along the first direction, the first sub-cavity and the second sub-cavity that are adjacent to each other are separated by the second reinforcing rib and are connected through a second through hole formed on the second reinforcing rib.

8. The battery device according to claim 7, characterized in that: A plurality of the first sub-cavities are arranged in at least two rows along the first direction to form at least two parallel outlet flow channels, and two adjacent outlet flow channels are connected via a third through hole provided on the second reinforcing rib; and / or, The plurality of second sub-cavities are arranged in at least two rows, and the at least two rows of the second sub-cavities are respectively arranged on two opposite sides of the outlet flow channel along the first direction.

9. The battery device according to any one of claims 1 to 8, characterized in that: The buffer device further comprises an adsorption material layer arranged in the accommodating cavity, and the adsorption material layer is used for adsorbing part of the substances in the emission.

10. The battery device according to any one of claims 1 to 8, characterized in that: The buffer device has the same shape as that of the battery cell.

11. The battery device according to claim 10, characterized in that: The plurality of battery cells and the buffer device are arranged along a first direction; along the first direction, a ratio of a size of the buffer device to a size of the battery cell is in a range of 0.9N to 1.1N, where N is a positive integer; and / or, Along the second direction, the ratio of the size of the buffer device to the size of the battery cell is in the range of 0.9M to 1.1M, where M is a positive integer, and the second direction intersects the first direction.

12. An electrical device, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 11, wherein the battery device is used to store or provide electrical energy.

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