Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, the volume energy density E of the battery monomer is greater than or equal to 300Wh / L and less than or equal to 1000Wh / L. The battery monomer comprises a shell, the shell is provided with a first wall, the first wall is provided with a pressure relief area, and the pressure relief area is a structure weak area of the first wall; the battery core assembly is arranged in the shell, the pressure relief area is configured to meet the conditions that S is larger than or equal to 100 mm < 2 > and smaller than or equal to 2000 mm < 2 >, and / or D is larger than or equal to 0.1 mm and smaller than or equal to 3 mm, S is the pressure relief area of the pressure relief area, and the unit is mm < 2 >; d is the minimum wall thickness of the pressure relief area, and the unit is mm. According to the technical scheme, the pressure relief area S of the pressure relief area is set to be more than or equal to 100mm < 2 > and less than or equal to 2000mm < 2 >, and / or the minimum wall thickness D of the pressure relief area is set to be more than or equal to 0.1 mm and less than or equal to 3mm, so that the risk that a shell of the single battery is exploded during thermal runaway can be effectively reduced, and the possibility that the pressure relief area is damaged due to external thermal shock during thermal runaway can be effectively reduced; therefore, the reliability of the battery monomer is effectively improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development. In the field of safety design of lithium-ion batteries, the pressure relief component is a key safety protection device for battery cells. Its core function is to achieve controllable pressure relief through a directional blasting mechanism when the internal pressure of the battery cell exceeds the preset safety threshold due to abnormal conditions such as overcharging and internal short circuit.

[0003] In the prior art, for mainstream large-capacity battery cells, to ensure the reliability of the pressure relief area, the pressure relief area of the battery cell usually has a sufficiently large pressure relief area, and the wall thickness of the pressure relief area is thickened accordingly. In the scenario of thermal runaway propagation at the module level, the high-temperature flue gas ejected by adjacent battery cells will form a directional flame impact, which will melt through the explosion-proof valve. Moreover, the too large wall thickness of the pressure relief area will cause the pressure relief area to not be damaged when the battery cell undergoes thermal runaway, resulting in the inability to timely discharge the high-pressure gas in the housing, and thus the pressure relief path fails. Summary of the Utility Model

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. For this reason, the present application provides a battery cell, a battery device, and an electrical device including this battery cell. The battery cell can not only effectively reduce the risk of the housing bursting during thermal runaway, but also effectively reduce the possibility of the pressure relief area being damaged by external thermal shock during thermal runaway, thereby effectively improving the safety and reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell. The volume energy density E of the battery cell is greater than or equal to 300 Wh / L and less than or equal to 1000 Wh / L. The battery cell includes: a housing having a first wall, and a pressure relief area is provided on the first wall, and the pressure relief area is a structurally weak area of the first wall; a battery cell assembly disposed in the housing, and the pressure relief area is configured to satisfy: 100 mm 2 ≤S≤2000mm 2 , and / or, 0.1 mm ≤ D ≤ 3 mm, where S is the pressure relief area of the pressure relief area, in units of mm 2 ; D is the minimum wall thickness of the pressure relief area, in units of mm.

[0006] In the above technical solution, by setting the pressure relief area S of the pressure relief area to 100mm 2 ≤S≤2000mm 2, and / or, setting the minimum wall thickness D of the pressure relief area to 0.1 mm ≤ D ≤ 3 mm can not only effectively reduce the risk of the casing of the battery cell bursting during thermal runaway, but also effectively reduce the possibility of the pressure relief area being damaged by external thermal shock during thermal runaway, thereby effectively improving the reliability of the battery cell.

[0007] In some embodiments of the present application, when the volumetric energy density E of the battery cell is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief area is configured to satisfy: 100 mm 2 ≤ S ≤ 860 mm 2 , and / or, 0.1 mm ≤ D ≤ 1 mm.

[0008] In the above technical solution, when the volumetric energy density E of the battery cell is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief area is configured to satisfy: 100 mm 2 ≤ S ≤ 860 mm 2 , and / or, 0.1 mm ≤ D ≤ 1 mm, which can effectively balance the relationship between the energy density of the battery cell and the pressure relief area and / or the minimum wall thickness of the pressure relief area, so that the battery cell has sufficient structural strength and reliable pressure relief performance.

[0009] In some embodiments of the present application, when the volumetric energy density E of the battery cell is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief area is configured to satisfy: 200 mm 2 ≤ S ≤ 630 mm 2 , and / or, 0.12 mm ≤ D ≤ 0.6 mm.

[0010] In the above technical solution, when the volumetric energy density E of the battery cell is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief area is configured to satisfy: 200 mm 2 ≤ S ≤ 630 mm 2 , and / or, 0.12 mm ≤ D ≤ 0.6 mm, which can further improve the rationality of the value range of the pressure relief area and / or the minimum wall thickness of the pressure relief area, thereby further improving the reliability of the battery cell.

[0011] In some embodiments of the present application, when the volumetric energy density E of the battery cell is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief area is configured to satisfy: 400 mm 2 ≤ S ≤ 1300 mm 2 , and / or, 0.1 mm ≤ D ≤ 1.5 mm.

[0012] In the above technical solution, when the volume energy density E of the battery cell is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief area is configured to satisfy: 400 mm 2 ≤S≤1300 mm 2 , and / or, 0.1 mm ≤ D ≤ 1.5 mm, which can effectively balance the relationship between the energy density of the battery cell and the pressure relief area of the pressure relief area and / or the minimum wall thickness of the pressure relief area, so that the battery cell has sufficient structural strength and reliable pressure relief performance.

[0013] In some embodiments of the present application, when the volume energy density E of the battery cell is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief area is configured to satisfy: 630 mm 2 ≤S≤1100 mm 2 , and / or, 0.15 mm ≤ D ≤ 1 mm.

[0014] In the above technical solution, when the volume energy density E of the battery cell is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief area is configured to satisfy: 630 mm 2 ≤S≤1100 mm 2 , and / or, 0.15 mm ≤ D ≤ 1 mm, which can further improve the rationality of the value range of the pressure relief area of the pressure relief area and / or the minimum wall thickness of the pressure relief area, thereby further improving the reliability of the battery cell.

[0015] In some embodiments of the present application, when the volume energy density E of the battery cell is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief area is configured to satisfy: 860 mm 2 ≤S≤2000 mm 2 , and / or, 0.2 mm ≤ D ≤ 3 mm.

[0016] In the above technical solution, when the volume energy density E of the battery cell is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief area is configured to satisfy: 860 mm 2 ≤S≤2000 mm 2 , and / or, 0.2 mm ≤ D ≤ 3 mm, which can effectively balance the relationship between the energy density of the battery cell and the pressure relief area of the pressure relief area and / or the minimum wall thickness of the pressure relief area, so that the battery cell has sufficient structural strength and reliable pressure relief performance.

[0017] In some embodiments of the present application, when the volume energy density E of the battery cell is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief area is configured to satisfy: 1100 mm 2 ≤S≤1500 mm 2, and / or, 0.4 mm ≤ D ≤ 2 mm.

[0018] In the above technical solution, when the volumetric energy density E of the battery cell is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief area is configured to satisfy: 1100 mm 2 ≤ S ≤ 1500 mm 2 , and / or, 0.4 mm ≤ D ≤ 2 mm, which can further improve the rationality of the pressure relief area of the pressure relief area and / or the value range of the minimum wall thickness of the pressure relief area, thereby further improving the reliability of the battery cell.

[0019] In some embodiments of the present application, the area A of the first wall and the pressure relief area S of the pressure relief area satisfy: 1 / 30 ≤ S / A ≤ 1 / 6.

[0020] In the above technical solution, by setting the ratio of the pressure relief area S of the pressure relief area to the area A of the first wall to 1 / 30 ≤ S / A ≤ 1 / 6, the relationship between the functionality of the pressure relief area and the structural strength of the first wall can be effectively balanced, so that the design of the pressure relief area can effectively release pressure when the battery cell is thermally out of control without overly weakening the overall structural strength of the first wall, thereby effectively improving the reliability of the battery cell.

[0021] In some embodiments of the present application, the area A of the first wall and the pressure relief area S of the pressure relief area satisfy: 1 / 15 ≤ S / A ≤ 1 / 10.

[0022] In the above technical solution, by setting the ratio of the pressure relief area S of the pressure relief area to the area A of the first wall to 1 / 15 ≤ S / A ≤ 1 / 10, the design of the pressure relief area of the pressure relief area can be further optimized, thereby further improving the reliability of the battery cell.

[0023] In some embodiments of the present application, in the length direction of the first wall, the maximum length dimension L1 of the pressure relief area and the length L0 of the first wall satisfy: 0.1 ≤ L1 / L0 ≤ 0.5.

[0024] In the above technical solution, in the length direction of the first wall, by setting the ratio of the maximum length dimension L1 of the pressure relief area to the length L0 of the first wall to 0.1 ≤ L1 / L0 ≤ 0.5, it is possible to effectively increase the possibility of normal pressure relief when the battery cell is thermally out of control and enable the first wall to have sufficient structural strength in its length direction, thereby effectively improving the reliability of the battery cell.

[0025] In some embodiments of the present application, the maximum length dimension L1 of the pressure relief area and the length L0 of the first wall satisfy: 0.25 ≤ L1 / L0 ≤ 0.4.

[0026] In the above technical solution, the ratio of the maximum length dimension L1 of the pressure relief area to the length L0 of the first wall is set to 0.25 ≤ L1 / L0 ≤ 0.4, which can not only effectively improve the durability of the battery cell, thereby effectively increasing the service life of the battery cell, but also improve the consistency of the battery cell during the production process, thereby effectively enhancing the production efficiency of the battery cell.

[0027] In some embodiments of the present application, in the width direction of the first wall, the maximum width dimension W1 of the pressure relief area and the width W0 of the first wall satisfy: 0.2 ≤ W1 / W0 ≤ 0.9.

[0028] In the above technical solution, in the width direction of the first wall, by setting the ratio of the maximum width dimension W1 of the pressure relief area to the width W0 of the first wall to 0.2 ≤ W1 / W0 ≤ 0.9, it can not only effectively improve the possibility of normal pressure relief when the battery cell is thermally out of control, but also enable the first wall to have sufficient structural strength in its length direction, thereby effectively improving the reliability of the battery cell.

[0029] In some embodiments of the present application, the maximum width dimension W1 of the pressure relief area and the width W0 of the first wall satisfy: 0.25 ≤ W1 / W0 ≤ 0.75.

[0030] In the above technical solution, by setting the ratio of the maximum width dimension W1 of the pressure relief area to the width W0 of the first wall to 0.25 ≤ W1 / W0 ≤ 0.75, it can not only effectively improve the durability of the battery cell, thereby effectively increasing the service life of the battery cell, but also improve the consistency of the battery cell during the production process, thereby effectively enhancing the production efficiency of the battery cell.

[0031] In some embodiments of the present application, the pressure relief area is formed with a notch or etching.

[0032] In the above technical solution, by providing a notch or etching on the pressure relief area, the structural configuration of the pressure relief area on the first wall can be effectively simplified, and the processing process of the pressure relief area can be effectively reduced, thereby effectively reducing the production cost and effectively improving the processing efficiency.

[0033] In some embodiments of the present application, the number of pressure relief areas on the housing is less than or equal to 4. When the number of pressure relief areas is multiple, the multiple pressure relief areas are respectively provided on the housing walls on different sides of the housing.

[0034] In the above technical solution, by setting the number of pressure relief areas on the housing to be less than or equal to 4, the reliability and structural strength of the housing can be effectively balanced, enabling the housing to effectively exhaust gas when the battery cell undergoes thermal runaway while ensuring sufficient structural strength. When the number of pressure relief areas is multiple, by arranging the multiple pressure relief areas on the housing walls on different sides of the housing, when the battery cell undergoes thermal runaway, the gas generated inside the housing can be discharged from the pressure relief areas in different directions, thereby reducing the risk of excessive local stress on the housing and further effectively reducing the risk of housing bursting, so as to further improve the reliability of the battery cell.

[0035] In some embodiments of the present application, the number of pressure relief areas is one or two.

[0036] In the above technical solution, by setting the number of pressure relief areas to be one or two, not only can the design and manufacturing processes be simplified, the production cost be reduced, but also quality control and detection can be facilitated. In addition, the overall structural strength of the housing can be effectively maintained, and the problem of structural vulnerability of the housing caused by excessive pressure relief areas can be reduced, thereby effectively improving the reliability of the housing.

[0037] In some embodiments of the present application, the pressure relief area is provided on the top wall and / or the bottom wall of the housing.

[0038] In the above technical solution, by providing the pressure relief area on the top wall and / or the bottom wall of the housing, not only can the reliability of the battery cell be further improved, but also the working efficiency of assembling and maintaining the battery cell can be effectively improved.

[0039] In some embodiments of the present application, the housing includes a main housing and an end cap. At least one side of the main housing is open in a first direction, and the end cap seals the open side of the main housing.

[0040] In the above technical solution, by providing a main housing and an end cap in the housing, with at least one side of the main housing open in a first direction and the end cap sealing the open side of the main housing, the convenience of disassembling, assembling and maintaining the battery cell can be effectively improved, thereby effectively improving the working efficiency of disassembling, assembling and maintaining the battery cell.

[0041] In some embodiments of the present application, the thickness of the end cap is greater than or equal to 1.5 mm and less than or equal to 4 mm.

[0042] In the above technical solution, by setting the thickness of the end cap to be greater than or equal to 1.5 mm and less than or equal to 4 mm, not only does the end cap have sufficient structural strength and is convenient for connecting with the main housing, but also the space of the accommodation cavity of the housing can be fully utilized, thereby effectively improving the space utilization rate and further effectively improving the energy density of the battery cell.

[0043] In some embodiments of the present application, the wall thickness of the main housing is greater than or equal to 0.1 mm and less than or equal to 4 mm.

[0044] In the above technical solution, setting the wall thickness of the main housing to be greater than or equal to 0.1 mm and less than or equal to 4 mm can not only control the structural strength and weight of the main housing within a reasonable range, but also contribute to the heat dissipation of the battery cell.

[0045] In some embodiments of the present application, the first wall is made of aluminum, steel or titanium.

[0046] In the above technical solution, setting the first wall as an aluminum component can effectively reduce the weight of the battery cell and effectively improve the heat dissipation efficiency of the battery cell; setting the first wall as a steel component can effectively improve the structural strength of the battery cell and effectively reduce the cost; setting the first wall as a titanium component can effectively improve the structural strength and durability of the battery cell.

[0047] In a second aspect, an embodiment of the present application provides a battery device, and the battery device includes a battery cell according to the first aspect of the present application.

[0048] In the above technical solution, by arranging the battery cell of the first aspect in the battery device, not only can the risk of the housing of the battery cell bursting during thermal runaway be effectively reduced, but also the possibility of the pressure relief area being damaged by external thermal shock during thermal runaway can be effectively reduced, thereby effectively improving the reliability of the battery device.

[0049] In a third aspect, an embodiment of the present application provides an electrical device, and the electrical device includes a battery device according to the second aspect of the present application.

[0050] In the above technical solution, by arranging the battery device of the second aspect in the electrical device, not only can the risk of the housing of the battery cell bursting during thermal runaway be effectively reduced, but also the possibility of the pressure relief area being damaged by external thermal shock during thermal runaway can be effectively reduced, thereby effectively improving the reliability of the electrical device.

[0051] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0052] Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0053] Figure 2 is an exploded view of a battery device according to an embodiment of the present application;

[0054] Figure 3Schematic diagram of a battery cell according to some embodiments of the present application;

[0055] Figure 4 Schematic diagram of a battery cell according to some other embodiments of the present application;

[0056] Figure 5 Schematic diagram of a battery cell according to yet some other embodiments of the present application;

[0057] Figure 6 Explosion diagram of a battery cell according to some embodiments of the present application;

[0058] Figure 7 Explosion diagram of a battery cell according to some other embodiments of the present application;

[0059] Figure 8 Explosion diagram of a battery cell according to yet some other embodiments of the present application;

[0060] Figure 9 Top view of a battery cell according to some embodiments of the present application;

[0061] Figure 10 Bottom view of a battery cell according to some other embodiments of the present application;

[0062] Figure 11 Side view of a battery cell according to yet some other embodiments of the present application.

[0063] Reference numerals:

[0064] 1, Electrical device;

[0065] 100, Battery device;

[0066] 10, Battery cell;

[0067] 11, Housing; 111, First wall; 1111, Pressure relief area; 11111, Score; 112, Main housing; 1121, Accommodation cavity; 113, End cap;

[0068] 12, Electrochemical cell assembly;

[0069] 13, Terminal;

[0070] 14, Adapter plate;

[0071] 20, Box body;

[0072] 21, Box main body;

[0073] 22, Cover body;

[0074] 200, Controller;

[0075] 300, Motor;

[0076] X, the first direction; Y, the second direction; Z, the third direction. Detailed implementation manners

[0077] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0078] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0079] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0080] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0081] In the description of the embodiments of this application, the term "and / or" 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 mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0082] In the description of the embodiments of this application, the term "a plurality of" refers to two or more (including two).

[0083] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0084] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific circumstances.

[0085] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include one or more battery cells. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0086] In some embodiments, the battery cell assembly is usually formed by arranging multiple battery cells. As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells with cable ties.

[0087] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0088] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0089] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing multiple battery cells to the box body.

[0090] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covering or closing, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0091] As an example, the box body 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 space is formed inside the box body to accommodate the battery cell assembly.

[0092] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0093] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body with a door provided on at least one side thereof. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0094] The battery cells mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the embodiments of the present application are not limited thereto. The battery cells can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application are not limited thereto either. Generally, the battery cells are divided into three types according to the encapsulation method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application are not limited thereto either.

[0095] Exemplarily, a battery cell generally includes a housing, a cell assembly, and an electrolyte. The housing is used to accommodate the cell assembly and the electrolyte, and at least one positive electrode terminal and at least one negative electrode terminal are provided on the housing. The cell assembly includes one or more electrode assemblies, and the electrode assemblies are formed by laminating or winding a positive electrode plate, a negative electrode plate, and a separator.

[0096] Among them, the positive electrode plate generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, and the positive electrode current collector without the positive electrode active material layer protruding from the positive electrode current collector with the positive electrode active material layer coated thereon. The positive electrode current collector without the positive electrode active material layer serves as the positive electrode tab, and a plurality of positive electrode tabs are stacked together and electrically connected to the positive electrode terminal. Exemplarily, a plurality of positive electrode tabs stacked together can be directly welded to the positive electrode terminal to form an electrical connection; or, the cell assembly can further include a positive electrode adapter plate. A plurality of positive electrode tabs stacked together are welded to one end of the positive electrode adapter plate, and the other end of the positive electrode adapter plate is welded to the positive electrode terminal so that the positive electrode tab is electrically connected to the positive electrode terminal.

[0097] The negative electrode tab generally may include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer coated thereon. The negative electrode current collector without the negative electrode active material layer serves as the negative electrode tab. A plurality of negative electrode tabs are stacked together and form an electrical connection with the negative electrode terminal. Exemplarily, a plurality of negative electrode tabs stacked together can be directly welded to the negative electrode terminal to form an electrical connection; alternatively, the battery cell assembly may further include a negative electrode adapter plate. A plurality of negative electrode tabs stacked together are welded to one end of the negative electrode adapter plate, and the other end of the negative electrode adapter plate is welded to the negative electrode terminal, so that the negative electrode tab forms an electrical connection with the negative electrode terminal. The material of the separator is not limited. For example, it can be polypropylene or polyethylene, etc.

[0098] Meanwhile, the battery cell mainly operates by relying on the movement of metal ions between the positive electrode tab and the negative electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. During the charge and discharge process, Li+ is embedded and de-embedded back and forth between the two electrodes: during charging, Li+ is de-embedded from the positive electrode and embedded into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharging, the situation is reversed.

[0099] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, and vehicles, etc.

[0100] In recent years, new energy vehicles have had a leapfrog development. In the field of electric vehicles, the battery device, as the power source of the electric vehicle, plays an irreplaceable and important role. With the popularization of the application of high-energy density material systems such as high-nickel ternary and silicon-carbon negative electrodes, the capacity of a single battery cell has exceeded the 300 Ah mark, and the corresponding gas generation during thermal runaway has increased exponentially. Among them, in the field of lithium-ion battery safety design, the pressure relief component, as a key safety protection device of the battery cell, plays a crucial role in the reliability of the battery cell.

[0101] In the battery cells in the related art, to ensure sufficient pressure relief flux, the effective area of the pressure relief component needs to be designed according to the relevant principles in gas dynamics. As a result, the proportion of the pressure relief area of the current mainstream large-capacity battery cells has exceeded 30% of the surface area of the housing. However, in the scenario of thermal runaway propagation at the module level, the high-temperature flue gas (temperature can reach 800 - 1200 °C) ejected by adjacent battery cells will form a directional flame impact. When the excessive pressure relief surface bears a heat flux density exceeding 50 kW / m², the explosion-proof valve made of aluminum alloy is prone to melt-through failure. This multi-stage thermal runaway coupling effect will lead to the failure of the pressure relief path, causing the pressure in the battery pack to suddenly increase within a very short time, and ultimately triggering an extreme safety accident of housing rupture and explosion.

[0102] In addition, to address the potential safety risks brought about by the increased gas production during thermal runaway of the battery cell, it is necessary to thicken the wall thickness of the pressure relief area of the battery cell accordingly. However, when the wall thickness of the pressure relief area is too thick, the gas generated during thermal runaway of the battery cell cannot break the pressure relief area in time, resulting in the gas in the housing not being able to be discharged through the pressure relief area in time. According to the ideal gas state equation PV = nRT (where P is the pressure, V is the volume, n is the amount of substance, R is the universal gas constant, and T is the temperature), in the relatively enclosed space of the housing of the battery cell, the inability to discharge the gas in time will cause the pressure to increase sharply. This excessive pressure will exert a huge pressure on the housing of the battery cell, causing the housing of the battery cell to deform excessively. When this deformation exceeds the limit that the housing of the battery cell can withstand, the housing will burst, and the high-temperature and high-pressure gas inside the battery cell will erupt uncontrollably instantaneously, and may be ejected together with the active substances and electrolyte inside the battery, forming a chain reaction inside the battery module or battery pack, and then triggering an extremely dangerous extreme event of battery explosion.

[0103] Based on the above considerations, in order to improve the reliability of the battery cell, the present application designs a battery cell. The volume energy density E of the battery cell is greater than or equal to 300 Wh / L and less than or equal to 1000 Wh / L. The battery cell includes a housing and a battery core assembly. The housing has a first wall, and a pressure relief area is provided on the first wall. The pressure relief area is a structurally weak area of the first wall. The battery core assembly is disposed inside the housing. The pressure relief area S of the pressure relief area satisfies 100 mm 2 ≤S≤2000 mm 2 , and / or, the minimum wall thickness D of the pressure relief area satisfies 0.1 mm ≤ D ≤ 3 mm. Thus, when the battery cell undergoes thermal runaway, the pressure relief area on the first wall of the housing enables the battery cell to have sufficient pressure relief flux, thereby effectively reducing the risk of the housing of the battery cell bursting during thermal runaway. In addition, the pressure relief area on the first wall of the housing can also effectively reduce the possibility of the pressure relief area being damaged by external thermal shock during thermal runaway, thereby effectively improving the reliability of the battery cell.

[0104] An embodiment of the present application provides an electrical device using the battery cell of the present disclosure as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, and the like. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console and an electric vehicle toy, etc.

[0105] For the convenience of description in the following embodiments, taking the electrical device 1 as a vehicle as an example, the structures of the battery cell, the battery device 100 and the electrical device 1 of the present application will be introduced in detail.

[0106] Please refer to Figure 1 , Figure 1 , the schematic structural diagram of the vehicle according to the embodiment of the present application. The vehicle 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. The vehicle is provided with a battery device 100, and the battery device 100 may be arranged at the bottom, the head or the tail of the vehicle. The battery device 100 can be used for power supply of the vehicle. For example, the battery device 100 can be used as the operating power source of the vehicle. The vehicle may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle. In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0107] Please refer to Figure 2 , Figure 2 is the exploded view of the battery device 100 according to the embodiment of the present application; Figure 3 is the schematic structural diagram of the battery cell 10 according to some embodiments of the present application; Figure 4 is the schematic structural diagram of the battery cell 10 according to some other embodiments of the present application; Figure 5 is the schematic structural diagram of the battery cell 10 according to still some other embodiments of the present application; Figure 6 is the exploded view of the battery cell 10 according to some embodiments of the present application; Figure 7 is the exploded view of the battery cell 10 according to some other embodiments of the present application; Figure 8 is the exploded view of the battery cell 10 according to still some other embodiments of the present application; Figure 9 is the top view of the battery cell 10 according to some embodiments of the present application; Figure 10 is the bottom view of the battery cell 10 according to some other embodiments of the present application; Figure 11 is the side view of the battery cell 10 according to still some other embodiments of the present application.

[0108] Next, refer toFigures 3 - 11 Describe a battery cell 10 according to an embodiment of the first aspect of the present application.

[0109] An embodiment of the present application proposes a battery cell 10. As Figures 3 - 11 shown, the volume energy density E of the battery cell 10 is greater than or equal to 300 Wh / L and less than or equal to 1000 Wh / L. The battery cell 10 includes: a housing 11 and a cell assembly 12.

[0110] The housing 11 has a first wall 111. A pressure relief area 1111 is provided on the first wall 111, and the pressure relief area 1111 is a structurally weak area of the first wall 111. The cell assembly 12 is disposed in the housing 11. The pressure relief area 1111 is configured to satisfy: 100 mm 2 ≤S≤2000 mm 2 , and / or, 0.1 mm ≤ D ≤ 3 mm, where S is the pressure relief area of the pressure relief area 1111, with the unit of mm 2 ; D is the minimum wall thickness of the pressure relief area 1111, with the unit of mm.

[0111] For example, the volume energy density E of the battery cell 10 in the present application can be 300 Wh / L, 400 Wh / L, 500 Wh / L, 600 Wh / L, 700 Wh / L, 800 Wh / L, 900 Wh / L, and 1000 Wh / L. In some specific examples, as Figures 3 - 8 shown, a terminal post 13 and a connecting piece 14 are further provided in the battery cell 10. The terminal post 13 is provided on a side wall of the housing 11 of the battery cell 10 on one side in the first direction X. An accommodation cavity 1121 for placing the cell assembly 12 is formed in the housing 11. The connecting piece 14 is located between the terminal post 13 and the cell assembly 12. It should be noted that, as Figures 3 - 8 shown, the first direction X is the height direction of the battery cell 10. Further, the number of terminal posts 13 is two, and the plurality of terminal posts 13 are spaced apart and distributed on a side wall of the housing 11 of the battery cell 10 on one side in the first direction X. The connecting piece 14 and the terminal post 13 are provided in one-to-one correspondence.

[0112] For example, the pressure relief area S of the pressure relief area 1111 can be 100 mm 2 , 200 mm 2 , 300 mm 2 , 400 mm 2 , 500 mm 2 , 600 mm 2 , 700 mm 2 , 800 mm 2 , 900 mm 2 , 1000 mm 2 , 1100 mm 2 , 1200 mm 2, 1300 mm 2 , 1400 mm 2 , 1500 mm 2 , 1600 mm 2 , 1700 mm 2 , 1800 mm 2 , 1900 mm 2 and 2000 mm 2 . For example, the minimum wall thickness D of the pressure relief area 1111 can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, and 3 mm.

[0113] For example, the pressure relief area S of the pressure relief area 1111 satisfies 100 mm 2 ≤ S ≤ 2000 mm 2 ; for another example, the minimum wall thickness D of the pressure relief area 1111 satisfies 0.1 mm ≤ D ≤ 3 mm; for yet another example, the pressure relief area S of the pressure relief area 1111 satisfies 100 mm 2 ≤ S ≤ 2000 mm 2 and the minimum wall thickness D of the pressure relief area 1111 satisfies 0.1 mm ≤ D ≤ 3 mm.

[0114] It should be noted that, as a structurally weak area on the first wall 111 of the housing 11, the structural strength of the pressure relief area 1111 is less than that of other areas on the housing 11 except the pressure relief area 1111. Thus, when the battery cell 10 undergoes thermal runaway, the gas generated inside the housing 11 of the battery cell 10 will cause the air pressure inside the housing 11 to continuously rise. Eventually, the pressure relief area 1111 on the first wall 111 will be the first to undergo directional damage under the action of the continuously rising air pressure inside the housing 11. After that, the high-pressure gas inside the housing 11 of the battery cell 10 is directionally discharged through the pressure relief area 1111. Thus, the air pressure inside the housing 11 of the battery cell 10 can be effectively reduced.

[0115] However, when the volume energy density E of the battery cell 10 is greater than or equal to 300 Wh / L and less than or equal to 1000 Wh / L, a large amount of gas will be generated inside the housing 11 of the battery cell 10 under thermal runaway conditions, and the gas pressure inside the housing 11 will rise rapidly. At this time, the pressure relief area 1111 on the first wall 111 of the housing 11 needs to have sufficient pressure relief flux, and the structural strength of the pressure relief area 1111 is required to be within a reasonable range, so that the pressure relief area 1111 can be damaged in time and the high-pressure gas inside the housing 11 can be discharged quickly, thereby reducing the gas pressure inside the housing 11 in time. If the pressure relief flux or structural strength of the pressure relief area 1111 on the first wall 111 of the housing 11 at this time cannot meet the normal pressure relief requirements, it will cause the high-pressure gas inside the housing 11 of the battery cell 10 to not be discharged in time under thermal runaway conditions, resulting in continuous pressure buildup inside the housing 11, and further increasing the risk of the housing 11 tearing and bursting.

[0116] Therefore, when designing the area of the pressure relief area 1111, it is necessary to follow the formulas and principles of gas dynamics, so that the pressure relief area 1111 on the first wall 111 of the housing 11 has sufficient pressure relief area. In this application, the pressure relief area S of the pressure relief area 1111 is set to S≥100mm 2 , which can make the pressure relief area 1111 have sufficient pressure relief area, so that the pressure relief area 1111 has sufficient pressure relief flux, and further effectively reduce the risk of the housing 11 of the battery cell 10 tearing and bursting under thermal runaway conditions. In addition, in order to enable the pressure relief area 1111 on the first wall 111 of the housing 11 to be damaged in time when the battery cell 10 is in thermal runaway to discharge the high-pressure gas inside the housing 11, the minimum wall thickness D of the pressure relief area 1111 is set to D≤3mm, so that the pressure relief area 1111 can be opened in time when the battery cell 10 is in thermal runaway.

[0117] In addition, if the pressure relief area S of the pressure relief area 1111 of the battery cell 10 is too large or the minimum wall thickness of the pressure relief area 1111 is too small, it will increase the risk that the pressure relief area 1111 of the battery cell 10 is burned through by the high-temperature flue gas generated by the thermal runaway of its adjacent battery cell 10, thereby increasing the possibility of thermal runaway of the battery cell 10. Therefore, considering the protective effect of the pressure relief area 1111 on the battery cell 10, the pressure relief area S of the pressure relief area 1111 of the battery cell 10 is set to S≤2000mm 2, and / or, set the minimum wall thickness D of the pressure relief area 1111 to D≥0.1 mm. Thus, not only can the risk of the pressure relief area 1111 being burned through by external high-temperature flue gas be reduced, effectively protecting the battery cell 10, but also the possibility of the battery cell 10 having a valve-opening failure can be effectively reduced, thereby effectively improving the reliability of the battery cell 10. In addition, setting the pressure relief area S of the pressure relief area 1111 of the battery cell 10 to S≤2000 mm 2 can also effectively reduce the industrialization difficulty of the battery cell 10, thereby effectively improving the convenience of manufacturing and assembling the battery cell 10.

[0118] When the pressure relief area S of the pressure relief area 1111 satisfies 100 mm 2 ≤S≤2000 mm 2 and the minimum wall thickness D of the pressure relief area 1111 satisfies 0.1 mm≤D≤3 mm, for example, the volume energy density E of the battery cell 10 is 600 Wh / L, the pressure relief area S of the pressure relief area 1111 is 600 mm 2 , and the minimum wall thickness D of the pressure relief area 1111 is 0.6 mm, the battery cell 10 can normally relieve pressure through the pressure relief area 1111 under thermal runaway conditions, thereby effectively increasing the reliability of the battery cell 10.

[0119] When the pressure relief area S of the pressure relief area 1111 < 100 mm 2 , for example, when the pressure relief area S of the pressure relief area 1111 is 75 mm 2 , due to the too small pressure relief area of the pressure relief area 1111, the pressure relief flux of the pressure relief area 1111 cannot meet the requirement of discharging the high-pressure gas inside the housing 11 when the battery cell 10 is in thermal runaway, resulting in continuous pressure buildup inside the housing 11, and further increasing the risk of the housing 11 tearing and bursting.

[0120] When the minimum wall thickness D of the pressure relief area 1111 > 3 mm, for example, when the minimum wall thickness D of the pressure relief area 1111 is 6 mm, due to the too large minimum wall thickness of the pressure relief area 1111, the pressure relief area 1111 cannot be opened in time when the battery cell 10 is in thermal runaway, resulting in continuous pressure buildup inside the housing 11, and further increasing the risk of the housing 11 tearing and bursting.

[0121] When the pressure relief area S of the pressure relief area 1111 > 2000 mm 2 , for example, when the pressure relief area S of the pressure relief area 1111 = 3000 mm 2 , due to the too large pressure relief area of the pressure relief area 1111, the risk of the pressure relief area 1111 of the battery cell 10 being burned through by external high-temperature flue gas during thermal runaway is increased, and the industrialization difficulty of the battery cell 10 is increased.

[0122] When the minimum wall thickness D of the pressure relief area 1111 is less than 0.1 mm, for example, when the minimum wall thickness D of the pressure relief area 1111 is 0.08 mm, since the minimum wall thickness of the pressure relief area 1111 is too small, it increases the risk that the pressure relief area 1111 of the battery cell 10 will be burned through by external high-temperature flue gas during thermal runaway, and the battery cell 10 is prone to valve opening failure, reducing the cycle reliability of the battery cell 10.

[0123] In the above technical solution, by setting the pressure relief area S of the pressure relief area 1111 to 100 mm 2 ≤S≤2000 mm 2 , and / or setting the minimum wall thickness D of the pressure relief area 1111 to 0.1 mm ≤ D ≤ 3 mm, it can not only effectively reduce the risk of the housing 11 of the battery cell 10 bursting during thermal runaway, but also effectively reduce the possibility of the pressure relief area 1111 being damaged by external thermal shock during thermal runaway, thus effectively improving the reliability of the battery cell 10.

[0124] It should be noted that the pressure relief area S of the pressure relief area 1111 and the minimum wall thickness D of the pressure relief area 1111 can be measured by measuring tools such as a coordinate measuring machine, a vernier caliper, and a micrometer. Taking the coordinate measuring machine as an example below, the measuring methods for the pressure relief area S of the pressure relief area 1111 and the minimum wall thickness D of the pressure relief area 1111 are described. First, the data points on the surface of the workpiece are obtained by using the probe contact or laser scanning of the coordinate measuring machine, and then the geometric parameters such as the area and wall thickness are calculated based on the data points.

[0125] In some embodiments of the present application, when the volume energy density E of the battery cell 10 is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief area 1111 is configured to satisfy: 100 mm 2 ≤S≤860 mm 2 , and / or 0.1 mm ≤ D ≤ 1 mm.

[0126] For example, the volume energy density E of the battery cell 10 can be 300 Wh / L, 350 Wh / L, 400 Wh / L, 450 Wh / L, and 500 Wh / L. For example, the pressure relief area S of the pressure relief area 1111 can be 100 mm 2 , 200 mm 2 , 300 mm 2 , 400 mm 2 , 500 mm 2 , 600 mm 2 , 700 mm 2 , 800 mm 2 and 860 mm 2For example, the minimum wall thickness D of the pressure relief area 1111 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm.

[0127] When the volume energy density E of the battery cell 10 is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, for example, the pressure relief area S of the pressure relief area 1111 satisfies 100 mm 2 ≤ S ≤ 860 mm 2 ; again, for example, the minimum wall thickness D of the pressure relief area 1111 satisfies 0.1 mm ≤ D ≤ 1 mm; furthermore, for example, the pressure relief area S of the pressure relief area 1111 satisfies 100 mm 2 ≤ S ≤ 860 mm 2 and the minimum wall thickness D of the pressure relief area 1111 satisfies 0.1 mm ≤ D ≤ 1 mm.

[0128] In the above technical solution, when the volume energy density E of the battery cell 10 is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief area 1111 is configured to satisfy: 100 mm 2 ≤ S ≤ 860 mm 2 , and / or, 0.1 mm ≤ D ≤ 1 mm, which can effectively balance the relationship between the energy density of the battery cell 10 and the pressure relief area of the pressure relief area 1111 and / or the minimum wall thickness of the pressure relief area 1111, so that the battery cell 10 has sufficient structural strength and reliable pressure relief performance.

[0129] In some embodiments of the present application, when the volume energy density E of the battery cell 10 is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief area 1111 is configured to satisfy: 200 mm 2 ≤ S ≤ 630 mm 2 , and / or, 0.12 mm ≤ D ≤ 0.6 mm.

[0130] For example, the volume energy density E of the battery cell 10 can be 300 Wh / L, 350 Wh / L, 400 Wh / L, 450 Wh / L, and 500 Wh / L. For example, the pressure relief area S of the pressure relief area 1111 can be 200 mm 2 , 300 mm 2 , 400 mm 2 , 500 mm 2 , 600 mm 2 , and 630 mm 2 . For example, the minimum wall thickness D of the pressure relief area 1111 can be 0.12 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm.

[0131] When the volume energy density E of the battery cell 10 is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, for example, the pressure relief area S of the pressure relief zone 1111 satisfies 200 mm 2 ≤S≤630 mm 2 ; again, for example, the minimum wall thickness D of the pressure relief zone 1111 satisfies 0.12 mm ≤ D ≤ 0.6 mm; furthermore, for example, the pressure relief area S of the pressure relief zone 1111 satisfies 200 mm 2 ≤S≤630 mm 2 and the minimum wall thickness D of the pressure relief zone 1111 satisfies 0.12 mm ≤ D ≤ 0.6 mm.

[0132] In the above technical solution, when the volume energy density E of the battery cell 10 is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief zone 1111 is configured to satisfy: 200 mm 2 ≤S≤630 mm 2 , and / or, 0.12 mm ≤ D ≤ 0.6 mm, which can further improve the rationality of the value range of the pressure relief area of the pressure relief zone 1111 and / or the minimum wall thickness of the pressure relief zone 1111, thereby further improving the reliability of the battery cell 10.

[0133] In some embodiments of the present application, when the volume energy density E of the battery cell 10 is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief zone 1111 is configured to satisfy: 400 mm 2 ≤S≤1300 mm 2 , and / or, 0.1 mm ≤ D ≤ 1.5 mm.

[0134] For example, the volume energy density E of the battery cell 10 can be 500 Wh / L, 550 Wh / L, 600 Wh / L, 650 Wh / L, 700 Wh / L, 750 Wh / L, and 800 Wh / L. For example, the pressure relief area S of the pressure relief zone 1111 can be 400 mm 2 , 500 mm 2 , 600 mm 2 , 700 mm 2 , 800 mm 2 , 900 mm 2 , 1000 mm 2 , 1100 mm 2 , 1200 mm 2 and 1300 mm 2 . For example, the minimum wall thickness D of the pressure relief zone 1111 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, and 1.5 mm.

[0135] When the volume energy density E of the battery cell 10 is greater than or equal to 500 Wh / L and less than or equal to 800 Wh / L, for example, the pressure relief area S of the pressure relief zone 1111 satisfies 400 mm 2 ≤S≤1300 mm 2 ; for another example, the minimum wall thickness D of the pressure relief zone 1111 satisfies 0.1 mm ≤ D ≤ 1.5 mm; for still another example, the pressure relief area S of the pressure relief zone 1111 satisfies 400 mm 2 ≤S≤1300 mm 2 and the minimum wall thickness D of the pressure relief zone 1111 satisfies 0.1 mm ≤ D ≤ 1.5 mm.

[0136] In the above technical solution, when the volume energy density E of the battery cell 10 is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief zone 1111 is configured to satisfy: 400 mm 2 ≤S≤1300 mm 2 , and / or, 0.1 mm ≤ D ≤ 1.5 mm, which can effectively balance the relationship between the energy density of the battery cell 10 and the pressure relief area of the pressure relief zone 1111 and / or the minimum wall thickness of the pressure relief zone 1111, so that the battery cell 10 has sufficient structural strength and reliable pressure relief performance.

[0137] In some embodiments of the present application, when the volume energy density E of the battery cell 10 is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief zone 1111 is configured to satisfy: 630 mm 2 ≤S≤1100 mm 2 , and / or, 0.15 mm ≤ D ≤ 1 mm.

[0138] For example, the volume energy density E of the battery cell 10 can be 500 Wh / L, 550 Wh / L, 600 Wh / L, 650 Wh / L, 700 Wh / L, 750 Wh / L, and 800 Wh / L. For example, the pressure relief area S of the pressure relief zone 1111 can be 630 mm 2 , 700 mm 2 , 800 mm 2 , 900 mm 2 , 1000 mm 2 , and 1100 mm 2 . For example, the minimum wall thickness D of the pressure relief zone 1111 can be 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm.

[0139] When the volume energy density E of the battery cell 10 is greater than or equal to 500 Wh / L and less than or equal to 800 Wh / L, for example, the pressure relief area S of the pressure relief zone 1111 satisfies 630 mm 2 ≤S≤1100 mm 2 ; for another example, the minimum wall thickness D of the pressure relief zone 1111 satisfies 0.15 mm ≤ D ≤ 1 mm; for still another example, the pressure relief area S of the pressure relief zone 1111 satisfies 630 mm 2 ≤S≤1100 mm 2 and the minimum wall thickness D of the pressure relief zone 1111 satisfies 0.15 mm ≤ D ≤ 1 mm.

[0140] In the above technical solution, when the volume energy density E of the battery cell 10 is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief zone 1111 is configured to satisfy: 630 mm 2 ≤S≤1100 mm 2 , and / or, 0.15 mm ≤ D ≤ 1 mm, which can further improve the rationality of the value range of the pressure relief area of the pressure relief zone 1111 and / or the minimum wall thickness of the pressure relief zone 1111, thereby further improving the reliability of the battery cell 10.

[0141] In some embodiments of the present application, when the volume energy density E of the battery cell 10 is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief zone 1111 is configured to satisfy: 860 mm 2 ≤S≤2000 mm 2 , and / or, 0.2 mm ≤ D ≤ 3 mm.

[0142] For example, the volume energy density E of the battery cell 10 can be 800 Wh / L, 850 Wh / L, 900 Wh / L, 950 Wh / L, and 1000 Wh / L. For example, the pressure relief area S of the pressure relief zone 1111 can be 860 mm 2 , 900 mm 2 , 1000 mm 2 , 1100 mm 2 , 1200 mm 2 , 1300 mm 2 , 1400 mm 2 , 1500 mm 2 , 1600 mm 2 , 1700 mm 2 , 1800 mm 2 , 1900 mm 2 and 2000 mm 2 . For example, the minimum wall thickness D of the pressure relief zone 1111 can be 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, and 3 mm.

[0143] When the volume energy density E of the battery cell 10 is greater than or equal to 800 Wh / L and less than or equal to 1000 Wh / L, for example, the pressure relief area S of the pressure relief zone 1111 satisfies 860 mm 2 ≤S≤2000 mm 2 ; or, the minimum wall thickness D of the pressure relief zone 1111 satisfies 0.2 mm ≤ D ≤ 3 mm; or, the pressure relief area S of the pressure relief zone 1111 satisfies 860 mm 2 ≤S≤2000 mm 2 and the minimum wall thickness D of the pressure relief zone 1111 satisfies 0.2 mm ≤ D ≤ 3 mm.

[0144] In the above technical solution, when the volume energy density E of the battery cell 10 is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief zone 1111 is configured to satisfy: 860 mm 2 ≤S≤2000 mm 2 , and / or, 0.2 mm ≤ D ≤ 3 mm, which can effectively balance the relationship between the energy density of the battery cell 10 and the pressure relief area of the pressure relief zone 1111 and / or the minimum wall thickness of the pressure relief zone 1111, so that the battery cell 10 has sufficient structural strength and reliable pressure relief performance.

[0145] In some embodiments of the present application, when the volume energy density E of the battery cell 10 is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief zone 1111 is configured to satisfy: 1100 mm 2 ≤S≤1500 mm 2 , and / or, 0.4 mm ≤ D ≤ 2 mm.

[0146] For example, the volume energy density E of the battery cell 10 can be 800 Wh / L, 850 Wh / L, 900 Wh / L, 950 Wh / L, and 1000 Wh / L. For example, the pressure relief area S of the pressure relief zone 1111 can be 1100 mm 2 , 1200 mm 2 , 1300 mm 2 , 1400 mm 2 , and 1500 mm 2 . For example, the minimum wall thickness D of the pressure relief zone 1111 can be 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2 mm.

[0147] When the volume energy density E of the battery cell 10 is greater than or equal to 800 Wh / L and less than or equal to 1000 Wh / L, for example, the pressure relief area S of the pressure relief zone 1111 satisfies 1100 mm 2 ≤S≤1500 mm 2; For another example, the minimum wall thickness D of the pressure relief area 1111 satisfies 0.4 mm ≤ D ≤ 2 mm; for yet another example, the pressure relief area S of the pressure relief area 1111 satisfies 1100 mm 2 ≤ S ≤ 1500 mm 2 and the minimum wall thickness D of the pressure relief area 1111 satisfies 0.4 mm ≤ D ≤ 2 mm.

[0148] In the above technical solution, when the volume energy density E of the battery cell 10 is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief area 1111 is configured to satisfy: 1100 mm 2 ≤ S ≤ 1500 mm 2 , and / or, 0.4 mm ≤ D ≤ 2 mm, which can further improve the rationality of the value range of the pressure relief area of the pressure relief area 1111 and / or the minimum wall thickness of the pressure relief area 1111, thereby further improving the reliability of the battery cell 10.

[0149] In some embodiments of the present application, the volume energy density E of the battery cell 10 and the pressure relief area S of the pressure relief area 1111 satisfy: 0.2 ≤ E / S ≤ 5.

[0150] For example, the ratio E / S of the volume energy density E of the battery cell 10 to the pressure relief area S of the pressure relief area 1111 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and 0.5. When E / S is less than 0.2, that is, the pressure relief area S of the pressure relief area 1111 is too large relative to the volume energy density E of the battery cell 10, which increases the risk that the pressure relief area 1111 of the battery cell 10 is burned through by external high-temperature flue gas during thermal runaway, and increases the industrialization difficulty of the battery cell 10.

[0151] When E / S is greater than 5, that is, the pressure relief area S of the pressure relief area 1111 is too small relative to the volume energy density E of the battery cell 10, resulting in that the pressure relief flux of the pressure relief area 1111 cannot meet the requirement of discharging the high-pressure gas inside the housing 11 during thermal runaway of the battery cell 10, so that the pressure inside the housing 11 continues to build up, and further increases the risk of the housing 11 tearing and bursting.

[0152] In the above technical solution, by setting the ratio of the volume energy density E of the battery cell 10 to the pressure relief area S of the pressure relief area 1111 to 0.2 ≤ E / S ≤ 5, the relationship between the volume energy density E of the battery cell 10 and the pressure relief area S of the pressure relief area 1111 can be effectively balanced, so that the design of the pressure relief area of the pressure relief area 1111 is neither too conservative nor too radical, thereby achieving the balance between reliability and pressure relief performance.

[0153] In some embodiments of the present application, the volume energy density E and the pressure relief area S satisfy: 0.25 ≤ E / S ≤ 2.5.

[0154] For example, the ratio E / S of the volumetric energy density E of the battery cell 10 to the pressure relief area S of the pressure relief zone 1111 can be 0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 2.25, and 2.5. When 0.2 ≤ E / S < 0.25, that is, the pressure relief area S of the pressure relief zone 1111 is relatively large with respect to the volumetric energy density E of the battery cell 10, thereby reducing the structural strength of the housing 11, and further reducing the reliability and durability of the battery cell 10.

[0155] When 2.5 < E / S ≤ 5, that is, the pressure relief area S of the pressure relief zone 1111 is relatively small with respect to the volumetric energy density E of the battery cell 10, thereby affecting the discharge rate of the high-pressure gas inside the housing 11 when the battery cell 10 is in thermal runaway, and further affecting the pressure relief performance of the battery cell 10.

[0156] In the above technical solution, by setting the ratio of the volumetric energy density E to the pressure relief area S to 0.25 ≤ E / S ≤ 2.5, not only can the reliability and durability of the battery cell 10 be effectively improved, but also the pressure relief performance of the battery cell 10 during thermal runaway can be effectively improved, thereby effectively reducing the risk of the housing 11 bursting when the battery cell 10 is in thermal runaway.

[0157] In some embodiments of the present application, the volumetric energy density E and the pressure relief area S satisfy: 0.3 ≤ E / S ≤ 2.

[0158] For example, the ratio E / S of the volumetric energy density E of the battery cell 10 to the pressure relief area S of the pressure relief zone 1111 can be 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, and 2. When 0.25 ≤ E / S < 0.3, that is, the pressure relief area S of the pressure relief zone 1111 is relatively large with respect to the volumetric energy density E of the battery cell 10, thereby increasing the processing difficulty of the pressure relief zone 1111 of the battery cell 10.

[0159] When 2 < E / S ≤ 2.5, that is, the pressure relief area S of the pressure relief zone 1111 is relatively small with respect to the volumetric energy density E of the battery cell 10, thereby reducing the rate at which the high-pressure gas is discharged from the pressure relief zone 1111 when the battery cell 10 is in thermal runaway, and further increasing the possibility of the housing 11 of the battery cell 10 bursting.

[0160] In the above technical solution, by setting the ratio of the volumetric energy density E to the pressure relief area S to 0.3 ≤ E / S ≤ 2, the processing efficiency of the pressure relief zone 1111 of the battery cell 10 can be effectively improved, and the reliability of the battery cell 10 can be further improved.

[0161] In some embodiments of the present application, as Figure 3 and Figure 4 shown, the volumetric energy density E and the pressure relief area S satisfy: 0.5 ≤ E / S ≤ 1.

[0162] For example, the ratio E / S of the volumetric energy density E of the battery cell 10 to the pressure relief area S of the pressure relief zone 1111 can be 0.5, 0.6, 0.7, 0.8, 0.9, and 1. When the volumetric energy density E of the battery cell 10 is determined, from the relational expression 0.5 ≤ E / S ≤ 1 of the ratio of the volumetric energy density E to the pressure relief area S, the range of the pressure relief area S of the pressure relief zone 1111 can be calculated more precisely, so that the design of the pressure relief area of the pressure relief zone 1111 can be further optimized.

[0163] In the above technical solution, by setting the ratio of the volumetric energy density E to the pressure relief area S to 0.5 ≤ E / S ≤ 1, the design of the pressure relief area of the pressure relief zone 1111 can be further optimized, thereby further improving the reliability of the battery cell 10.

[0164] In some embodiments of the present application, as Figure 3 and Figure 4 shown, the volumetric energy density E of the battery cell 10 and the minimum wall thickness D of the pressure relief zone 1111 satisfy: 100 ≤ E / D ≤ 10000.

[0165] For example, the ratio of the volumetric energy density E of the battery cell 10 to the minimum wall thickness D of the pressure relief zone 1111 can be 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000. When E / D is less than 100, that is, the minimum wall thickness D of the pressure relief zone 1111 is too large relative to the volumetric energy density E of the battery cell 10, resulting in too high a structural strength of the pressure relief zone 1111, thus increasing the risk that the pressure relief zone 1111 cannot be opened during thermal runaway of the battery cell 10, and further increasing the risk of tearing and bursting of the housing 11.

[0166] When E / D is greater than 1000, that is, the minimum wall thickness D of the pressure relief zone 1111 is too small relative to the volumetric energy density E of the battery cell 10, it increases the risk that the pressure relief zone 1111 of the battery cell 10 is burned through by external high-temperature flue gas during thermal runaway.

[0167] In the above technical solution, by setting the ratio of the volumetric energy density E of the battery cell 10 to the minimum wall thickness D of the pressure relief zone 1111 to 100 ≤ E / D ≤ 10000, the relationship between the volumetric energy density E of the battery cell 10 and the minimum wall thickness D of the pressure relief zone 1111 can be effectively balanced, and the pressure relief zone 1111 can be provided with reasonable structural strength, thereby effectively protecting the battery cell 10.

[0168] In some embodiments of the present application, the volumetric energy density E and the minimum wall thickness D of the pressure relief zone 1111 satisfy: 300 ≤ E / D ≤ 2500.

[0169] For example, the ratio of the volumetric energy density E of the battery cell 10 to the minimum wall thickness D of the pressure relief area 1111 can be 300, 600, 900, 1200, 1500, 1800, 2100, 2400, and 2500. When 100 ≤ E / D < 300, that is, the minimum wall thickness D of the pressure relief area 1111 is relatively large with respect to the volumetric energy density E of the battery cell 10, thereby reducing the material utilization rate.

[0170] When 2500 < E / D ≤ 10000, that is, the minimum wall thickness D of the pressure relief area 1111 is relatively small with respect to the volumetric energy density E of the battery cell 10, thereby reducing the cycle reliability of the battery cell 10 and increasing the possibility of valve-opening failure of the battery cell 10.

[0171] In the above technical solution, by setting the ratio of the volumetric energy density E to the minimum wall thickness D of the pressure relief area 1111 to 300 ≤ E / D ≤ 2500, not only can the material utilization rate be improved, but also the cycle reliability of the battery cell 10 can be effectively improved.

[0172] In some embodiments of the present application, the volumetric energy density E and the minimum wall thickness D of the pressure relief area 1111 satisfy: 500 ≤ E / D ≤ 2000.

[0173] For example, the ratio of the volumetric energy density E of the battery cell 10 to the minimum wall thickness D of the pressure relief area 1111 can be 500, 700, 900, 1100, 1300, 1500, 1700, 1900, and 2000. When the volumetric energy density E of the battery cell 10 is determined, from the relational expression 500 ≤ E / D ≤ 2000 of the ratio of the volumetric energy density E to the minimum wall thickness D of the pressure relief area 1111, the range of the minimum wall thickness D of the pressure relief area 1111 can be calculated more precisely, thereby further optimizing the design of the minimum wall thickness of the pressure relief area 1111.

[0174] In the above technical solution, by setting the ratio of the volumetric energy density E to the minimum wall thickness D of the pressure relief area 1111 to 500 ≤ E / D ≤ 2000, the design of the minimum wall thickness of the pressure relief area 1111 can be further optimized, thereby further improving the reliability of the battery cell 10.

[0175] In some embodiments of the present application, as Figures 9 - 11 shown, the area A of the first wall 111 and the pressure relief area S of the pressure relief area 1111 satisfy: 1 / 30 ≤ S / A ≤ 1 / 6.

[0176] For example, the ratio of the pressure relief area S of the pressure relief zone 1111 to the area A of the first wall 111 can be 1 / 30, 1 / 25, 1 / 20, 1 / 15, 1 / 10, and 1 / 6. When S / A is less than 1 / 30, that is, the area of the pressure relief zone 1111 is too small relative to the total area of the first wall 111, which increases the possibility that the pressure relief zone 1111 cannot release pressure in time during thermal runaway, and further increases the risk of the housing 11 bursting.

[0177] When S / A is greater than 1 / 6, that is, the area of the pressure relief zone 1111 is too large relative to the total area of the first wall 111, which causes a significant decrease in the overall structural strength of the first wall 111, thereby increasing the risk of accidental rupture of the first wall 111 due to external impact or internal pressure.

[0178] In the above technical solution, by setting the ratio of the pressure relief area S of the pressure relief zone 1111 to the area A of the first wall 111 to 1 / 30 ≤ S / A ≤ 1 / 6, the relationship between the functionality of the pressure relief zone 1111 and the structural strength of the first wall 111 can be effectively balanced, so that the design of the pressure relief zone 1111 can effectively release pressure during thermal runaway of the battery cell 10 without overly weakening the overall structural strength of the first wall 111, thereby effectively improving the reliability of the battery cell 10.

[0179] It should be noted that the area A of the first wall 111 can be measured by measuring tools such as a coordinate measuring machine, a vernier caliper, and a micrometer. Taking a coordinate measuring machine as an example below, the measuring method of the area A of the first wall 111 is described. First, the data points on the surface of the workpiece are obtained by using the probe contact or laser scanning of the coordinate measuring machine, and then the geometric parameters such as the area are calculated based on the data points.

[0180] In some embodiments of the present application, as Figures 9 - 11 shown, the area A of the first wall 111 and the pressure relief area S of the pressure relief zone 1111 satisfy: 1 / 15 ≤ S / A ≤ 1 / 10.

[0181] For example, the ratio of the pressure relief area S of the pressure relief zone 1111 to the area A of the first wall 111 can be 1 / 15, 1 / 14, 1 / 13, 1 / 12, 1 / 11, and 1 / 10. Setting the ratio of the pressure relief area S of the pressure relief zone 1111 to the area A of the first wall 111 to 1 / 15 ≤ S / A can make the pressure relief zone 1111 on the first wall 111 have sufficient pressure relief area, thereby effectively reducing the poor exhaust caused by insufficient pressure relief area during thermal runaway of the battery cell 10. In addition, when the pressure relief area on the first wall 111 is insufficient, it may cause the pressure relief zone 1111 not to be fully opened. For example, it may cause the pressure relief zone 1111 to only crack but not flip, thus affecting the discharge of the gas inside the housing 11.

[0182] Set the ratio of the pressure relief area S of the pressure relief area 1111 to the area A of the first wall 111 as S / A ≤ 1 / 10. During the charge and discharge cycle of the battery, it can effectively reduce the possibility of cracking of the pressure relief area 1111 due to its own breathing fatigue, thereby effectively reducing the possibility of liquid leakage of the battery cell 10.

[0183] In the above technical solution, by setting the ratio of the pressure relief area S of the pressure relief area 1111 to the area A of the first wall 111 as 1 / 15 ≤ S / A ≤ 1 / 10, the design of the pressure relief area of the pressure relief area 1111 can be further optimized, thereby further improving the reliability of the battery cell 10.

[0184] In some embodiments of the present application, as Figures 9 - 11 shown, in the length direction of the first wall 111, the maximum length dimension L1 of the pressure relief area 1111 and the length L0 of the first wall 111 satisfy: 0.1 ≤ L1 / L0 ≤ 0.5.

[0185] For example, the ratio of the maximum length dimension L1 of the pressure relief area 1111 to the length L0 of the first wall 111 can be 0.1, 0.2, 0.3, 0.4, and 0.5. When L1 / L0 is less than 0.1, that is, in the length direction of the first wall 111, the maximum length dimension L1 of the pressure relief area 1111 is too small relative to the length L0 of the first wall 111, increasing the risk that the pressure in the housing 11 cannot be released in time when the battery cell 10 undergoes thermal runaway, thereby increasing the risk of bursting of the housing 11.

[0186] When L1 / L0 is greater than 0.5, that is, in the length direction of the first wall 111, the maximum length dimension L1 of the pressure relief area 1111 is too large relative to the length L0 of the first wall 111, thus significantly affecting the structural strength of the first wall 111 in its length direction and increasing the risk of accidental rupture of the first wall 111 under the action of external impact or internal pressure.

[0187] In the above technical solution, in the length direction of the first wall 111, by setting the ratio of the maximum length dimension L1 of the pressure relief area 1111 to the length L0 of the first wall 111 as 0.1 ≤ L1 / L0 ≤ 0.5, it can not only effectively increase the possibility of normal pressure relief when the battery cell 10 undergoes thermal runaway, but also enable the first wall 111 to have sufficient structural strength in its length direction, thereby effectively improving the reliability of the battery cell 10.

[0188] It should be noted that the maximum length dimension L1 of the pressure relief area 1111 and the length L0 of the first wall 111 can be measured by measuring tools such as a coordinate measuring machine, a vernier caliper, and a micrometer. Taking the coordinate measuring machine as an example below, the measuring method for the maximum length dimension L1 of the pressure relief area 1111 and the length L0 of the first wall 111 is described. First, data points on the surface of the workpiece are obtained by using the probe of the coordinate measuring machine to contact or laser scan, and then geometric parameters such as length are calculated based on the data points.

[0189] In some embodiments of the present application, as Figures 9 - 11 shown, the maximum length dimension L1 of the pressure relief area 1111 and the length L0 of the first wall 111 satisfy: 0.25 ≤ L1 / L0 ≤ 0.4.

[0190] For example, the ratio of the maximum length dimension L1 of the pressure relief area 1111 to the length L0 of the first wall 111 can be 0.25, 0.3, 0.35, and 0.4. Setting the ratio of the maximum length dimension L1 of the pressure relief area 1111 to the length L0 of the first wall 111 to 0.25 ≤ L1 / L0 ≤ 0.4 can better balance the relationship between the functionality of the pressure relief area 1111 and the overall structural strength of the housing 11, thereby effectively improving the durability of the battery cell 10. In addition, more precise range limitations can effectively improve the consistency of the battery cell 10 during the production process, thereby effectively improving the production efficiency of the battery cell 10.

[0191] In the above technical solution, setting the ratio of the maximum length dimension L1 of the pressure relief area 1111 to the length L0 of the first wall 111 to 0.25 ≤ L1 / L0 ≤ 0.4 can not only effectively improve the durability of the battery cell 10, thereby effectively increasing the service life of the battery cell 10, but also improve the consistency of the battery cell 10 during the production process, thereby effectively enhancing the production efficiency of the battery cell 10.

[0192] In some embodiments of the present application, as Figures 9 - 11 shown, in the width direction of the first wall 111, the maximum width dimension W1 of the pressure relief area 1111 and the width W0 of the first wall 111 satisfy: 0.2 ≤ W1 / W0 ≤ 0.9.

[0193] For example, in the width direction of the first wall 111, the ratio of the maximum width dimension W1 of the pressure relief area 1111 to the width W0 of the first wall 111 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9. When W1 / W0 is less than 0.2, that is, in the width direction of the first wall 111, the maximum width dimension W1 of the pressure relief area 1111 is too small relative to the width W0 of the first wall 111, increasing the risk that the pressure in the housing 11 cannot be released in time when the battery cell 10 has a thermal runaway, thereby increasing the risk of the housing 11 bursting.

[0194] When W1 / W0 is greater than 0.9, that is, in the width direction of the first wall 111, the maximum width dimension W1 of the pressure relief area 1111 is too large relative to the width W0 of the first wall 111, thus significantly affecting the structural strength of the first wall 111 in its width direction and increasing the risk of accidental rupture of the first wall 111 under the action of external impact or internal pressure.

[0195] In the above technical solution, in the width direction of the first wall 111, by setting the ratio of the maximum width dimension W1 of the pressure relief area 1111 to the width W0 of the first wall 111 to be 0.2 ≤ W1 / W0 ≤ 0.9, it is possible to effectively increase the possibility of normal pressure relief when the battery cell 10 undergoes thermal runaway, and at the same time enable the first wall 111 to have sufficient structural strength in its length direction, thereby effectively improving the reliability of the battery cell 10.

[0196] It should be noted that the maximum width dimension W1 of the pressure relief area 1111 and the width W0 of the first wall 111 can be measured by measuring tools such as a coordinate measuring machine, a vernier caliper, and a micrometer. Taking the coordinate measuring machine as an example below, the measurement method for the maximum width dimension W1 of the pressure relief area 1111 and the width W0 of the first wall 111 is described. First, data points on the surface of the workpiece are obtained by using the probe contact or laser scanning of the coordinate measuring machine, and then geometric parameters such as the width are calculated based on the data points.

[0197] In some embodiments of the present application, as Figures 9 - 11 shown, the maximum width dimension W1 of the pressure relief area 1111 and the width W0 of the first wall 111 satisfy: 0.25 ≤ W1 / W0 ≤ 0.75.

[0198] For example, in the width direction of the first wall 111, the ratio of the maximum width dimension W1 of the pressure relief area 1111 to the width W0 of the first wall 111 can be 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, and 0.75. Setting the ratio of the maximum width dimension W1 of the pressure relief area 1111 to the width W0 of the first wall 111 to be 0.25 ≤ W1 / W0 ≤ 0.75 can better balance the relationship between the functionality of the pressure relief area 1111 and the overall structural strength of the housing 11, thereby effectively improving the durability of the battery cell 10. In addition, more precise range limitations can effectively improve the consistency of the battery cell 10 during the production process, thereby effectively improving the production efficiency of the battery cell 10.

[0199] In the above technical solution, by setting the ratio of the maximum width dimension W1 of the pressure relief zone 1111 to the width W0 of the first wall 111 to 0.25≤W1 / W0≤0.75, not only can the durability of the battery cell 10 be effectively improved, thereby effectively increasing the service life of the battery cell 10, but also the consistency of the battery cell 10 in the production process can be improved, thereby effectively improving the production efficiency of the battery cell 10.

[0200] In some embodiments of the present application, Figures 6 - 11 As shown, the pressure relief area 1111 is formed with notches 11111 or etching.

[0201] It should be noted that if Figures 6 - 11 As shown, the first direction X is the height direction of the battery cell 10 , the second direction Y is the length direction of the battery cell 10 , and the third direction Z is the width direction of the battery cell 10 . The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0202] In some specific examples, the pressure relief zone 1111 of the first wall 111 is formed with an I-shaped notch 11111, the maximum length dimension L1 of the pressure relief zone 1111 is the maximum length dimension of the notch 11111 in the second direction Y, the maximum width dimension W1 of the pressure relief zone 1111 is the maximum width dimension of the notch 11111 in the third direction Z, and the pressure relief area S of the pressure relief zone 1111 is the product of L1 and W1. Further, the notch 11111 is integrally formed on the first wall 111, and a groove is formed in the notch 11111, and the minimum distance between the bottom wall of the groove and the surface of the first wall 111 facing the battery cell assembly 12 is the minimum wall thickness D of the pressure relief zone 1111.

[0203] In the above technical solution, by setting notches 11111 or etching on the pressure relief area 1111, the structural structure of the pressure relief area 1111 on the first wall 111 can be effectively simplified, and the processing process of the pressure relief area 1111 can be effectively reduced, thereby effectively reducing production costs and effectively improving processing efficiency.

[0204] In some embodiments of the present application, the number of pressure relief areas 1111 on the shell 11 is less than or equal to 4. When the number of pressure relief areas 1111 is multiple, the multiple pressure relief areas 1111 are respectively arranged on the shell walls on different sides of the shell 11.

[0205] For example, the number of pressure relief areas 1111 on the housing 11 can be one, two, three, or four. When the number of pressure relief areas 1111 is multiple, the multiple pressure relief areas 1111 are respectively arranged on the housing walls on different sides of the housing 11. For example, when the number of pressure relief areas 1111 is two, the two pressure relief areas 1111 can be arranged on the side walls on both sides of the housing 11 in the first direction X, or the two pressure relief areas 1111 can be arranged on the side walls on both sides of the housing 11 in the second direction Y.

[0206] In the above technical solution, by setting the number of pressure relief areas 1111 on the housing 11 to be less than or equal to 4, the reliability and structural strength of the housing 11 can be effectively balanced, enabling the housing 11 to effectively exhaust gas when the battery cell 10 undergoes thermal runaway while ensuring sufficient structural strength; when the number of pressure relief areas 1111 is multiple, by arranging the multiple pressure relief areas 1111 on the housing walls on different sides of the housing 11 respectively, when the battery cell 10 undergoes thermal runaway, the gas generated inside the housing 11 can be discharged from the pressure relief areas 1111 in different directions, thereby reducing the risk of excessive local stress on the housing 11 and further effectively reducing the risk of the housing 11 bursting, thereby further improving the reliability of the battery cell 10.

[0207] In some embodiments of the present application, as Figures 6 - 11 shown, the number of pressure relief areas 1111 is one or two.

[0208] In some specific examples, as Figure 6 and Figure 9 shown, the number of pressure relief areas 1111 on the housing 11 is one, and the pressure relief area 1111 is arranged on one of the side walls on both sides of the housing 11 in the first direction X. In some other specific examples, as Figure 7 and Figure 10 shown, the number of pressure relief areas 1111 on the housing 11 is one, and the pressure relief area 1111 is arranged on the other of the side walls on both sides of the housing 11 in the first direction X. In still some other specific examples, as Figure 8 and Figure 11 shown, the number of pressure relief areas 1111 on the housing 11 is one, and the pressure relief area 1111 is arranged on the other of the side walls on both sides of the housing 11 in the second direction Y.

[0209] In the above technical solution, by setting the number of pressure relief areas 1111 to be one or two, not only can the design and manufacturing processes be simplified, the production cost be reduced, but also quality control and detection can be facilitated. In addition, the overall structural strength of the housing 11 can be effectively maintained, and the problem of structural vulnerability of the housing 11 caused by excessive pressure relief areas 1111 can be reduced, thereby effectively improving the reliability of the housing 11.

[0210] In some embodiments of the present application, as Figure 9 and Figure 10 shown, the pressure relief area 1111 is provided on the top wall and / or bottom wall of the housing 11.

[0211] For example, the pressure relief area 1111 can be provided on the top wall of the housing 11; or, the pressure relief area 1111 can be provided on the bottom wall of the housing 11; or, the pressure relief area 1111 can be provided on both the top wall and the bottom wall of the housing 11. In some specific examples, as Figure 9 shown, the pressure relief area 1111 is provided on the top wall of the housing 11 in the first direction X. In other specific examples, as Figure 10 shown, the pressure relief area 1111 is provided on the bottom wall of the housing 11 in the first direction X.

[0212] It should be noted that the exhaust passage of the battery cell 10 is usually provided on one side of the top wall or the bottom wall of the housing 11. By providing the pressure relief area 1111 on the top wall and / or bottom wall of the housing 11, when the battery cell 10 undergoes thermal runaway, high-pressure gas can quickly escape from a safe direction, reducing damage to the interior of the battery cell 10 and other external components, and reducing the explosion risk. In addition, it is also convenient for the assembly and maintenance of the battery cell 10.

[0213] In the above technical solution, by providing the pressure relief area 1111 on the top wall and / or bottom wall of the housing 11, not only can the reliability of the battery cell 10 be further improved, but also the working efficiency of the assembly and maintenance of the battery cell 10 can be effectively improved.

[0214] In some embodiments of the present application, as Figures 6 - 8 shown, the housing 11 includes a main housing 112 and an end cap 113. The main housing 112 is open on at least one side in the first direction X, and the end cap 113 covers the open side of the main housing 112.

[0215] For example Figures 6 - 8 shown, the main housing 112 is open on one side in the first direction X. A receiving cavity 1121 for placing the battery cell assembly 12 is formed in the main housing 112. A pole 13 is provided on the end cap 113. The connecting piece 14 is located between the end cap 113 and the battery cell assembly 12. The end cap 113 covers the open side of the main housing 112. Further, the end cap 113 can be sealed to the open side of the main housing 112 by welding.

[0216] The accommodation cavity 1121 of the main housing 112 serves as the main bearing structure for the battery cell 10, capable of accommodating the battery cell assembly 12, the electrolyte, and other internal components. The end cap 113 can not only play a sealing role but also integrate connection components such as the pole 13, facilitating the connection of the battery cell 10 to other devices or components. By providing the main housing 112 and the end cap 113 in the housing 11, it is convenient to disassemble and assemble the battery cell 10, thereby effectively improving the convenience of maintaining the battery cell 10.

[0217] In the above technical solution, by providing the main housing 112 and the end cap 113 in the housing 11, at least one side of the main housing 112 is open in the first direction X, and the end cap 113 covers the open side of the main housing 112, which can effectively improve the convenience of disassembling, assembling, and maintaining the battery cell 10, thereby effectively improving the working efficiency of disassembling, assembling, and maintaining the battery cell 10.

[0218] In some embodiments of the present application, the thickness of the end cap 113 is greater than or equal to 1.5 mm and less than or equal to 4 mm.

[0219] For example, the thickness of the end cap 113 can be 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, and 4 mm. Setting the minimum thickness of the end cap 113 to 1.5 mm enables the end cap 113 to have sufficient mechanical strength and be convenient for welding to withstand normal operating pressures, external impacts, and possible internal gas pressures. If the end cap 113 is too thin, the possibility of deformation or rupture of the end cap 113 under extreme conditions (such as thermal runaway or external impact) will increase, thus affecting the sealing performance of the battery.

[0220] Setting the maximum thickness of the end cap 113 to 4 mm can, on the one hand, effectively save materials, thereby controlling the cost within a reasonable range, and on the other hand, effectively save space, so that the accommodation cavity 1121 of the housing 11 can accommodate more battery cell assemblies 12, thereby improving the energy density of the entire battery cell 10.

[0221] In the above technical solution, setting the thickness of the end cap 113 to be greater than or equal to 1.5 mm and less than or equal to 4 mm not only enables the end cap 113 to have sufficient structural strength and facilitates the connection between the end cap 113 and the main housing 112, but also enables the space of the accommodation cavity 1121 of the housing 11 to be fully utilized, thereby effectively improving the space utilization rate and further effectively improving the energy density of the battery cell 10.

[0222] In some embodiments of the present application, the wall thickness of the main housing 112 is greater than or equal to 0.1 mm and less than or equal to 4 mm.

[0223] For example, the wall thickness of the main housing 112 can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, and 4 mm. Setting the minimum wall thickness of the main housing 112 to 0.1 mm enables the main housing 112 to have sufficient structural strength and durability, thereby effectively extending the service life of the housing 11. Setting the maximum wall thickness of the main housing 112 to 4 mm can not only effectively control the weight of the housing 11 but also help the heat inside the housing 11 to conduct to the outside faster.

[0224] In the above technical solution, setting the wall thickness of the main housing 112 to be greater than or equal to 0.1 mm and less than or equal to 4 mm can not only control the structural strength and weight of the main housing 112 within a reasonable range but also help with the heat dissipation of the battery cell 10.

[0225] In some embodiments of the present application, the first wall 111 is a component made of aluminum, steel, or titanium.

[0226] It should be noted that the aluminum component has a relatively low density, thus enabling the goal of lightweight of the battery cell 10. In addition, the aluminum component also has good thermal conductivity, which helps with the rapid heat dissipation of the battery cell 10. The steel component has excellent mechanical strength, can provide stronger mechanical protection, and has a relatively low cost, thereby effectively reducing the cost of the battery cell 10. The titanium component has an excellent strength-to-weight ratio and excellent corrosion resistance, thus effectively improving the structural strength and durability of the battery cell 10.

[0227] In the above technical solution, setting the first wall 111 as an aluminum component can effectively reduce the weight of the battery cell 10 and effectively improve the heat dissipation efficiency of the battery cell 10; setting the first wall 111 as a steel component can effectively improve the structural strength of the battery cell 10 and effectively reduce the cost; setting the first wall 111 as a titanium component can effectively improve the structural strength and durability of the battery cell 10.

[0228] Second, as Figure 2 shown, an embodiment of the present application provides a battery device 100, and the battery device 100 includes a battery cell 10 according to the first aspect of the present application.

[0229] In some specific examples, such as Figure 2As shown, multiple battery cells 10 are connected in series or in parallel with each other to form a complete battery module, thereby achieving the storage and transportation of electrical energy. Further, a box body 20 is also provided in the battery device 100. The box body 20 includes a box main body 21 and a cover body 22. The box main body 21 is in the shape of a cuboid with an open top. The cover body 22 seals the top of the box main body 21, and the peripheral edge of the cover body 22 is fixedly connected to the peripheral edge of the box main body 21 through fasteners. The multiple battery cells 10 are arranged in layers along the length direction of the box body 20 to form a battery cell 10 assembly, and multiple battery cell 10 assemblies are arranged in sequence along the width direction of the box body 20.

[0230] In the above technical solution, by providing the battery cell 10 of the first aspect in the battery device 100, not only can the risk of the housing 11 of the battery cell 10 bursting during thermal runaway be effectively reduced, but also the possibility of the pressure relief area 1111 being damaged by external thermal shock during thermal runaway can be effectively reduced, thereby effectively improving the reliability of the battery device 100.

[0231] In a third aspect, an embodiment of the present application provides an electrical device 1, and the electrical device 1 includes the battery device 100 according to the second aspect of the present application.

[0232] For example Figure 1 As shown, the electrical device 1 can be a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery device 100, and the battery device 100 can be arranged at the bottom, the head or the tail of the vehicle. The battery device 100 can be used for power supply of the vehicle. For example, the battery device 100 can be used as the operating power source of the vehicle.

[0233] The vehicle further includes a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle. In some specific examples, the battery device 100 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0234] In the above technical solution, by providing the battery device 100 of the second aspect in the electrical device 1, not only can the risk of the housing 11 of the battery cell 10 bursting during thermal runaway be effectively reduced, but also the possibility of the pressure relief area 1111 being damaged by external thermal shock during thermal runaway can be effectively reduced, thereby effectively improving the reliability of the electrical device 1.

[0235] Next, reference will be made to Figures 3 - 11 Describe the battery cell 10 according to three specific embodiments of the present application.

[0236] like Figures 3 - 8 As shown, the battery cell 10 includes a housing 11 , a cell assembly 12 , a pole 13 and a switching piece 14 .

[0237] like Figures 3 - 5 As shown, a pressure relief zone 1111 is provided on the housing 11, and the side wall where the pressure relief zone 1111 is located is the first wall 111, and the first wall 111 is made of aluminum, steel or titanium, and the pressure relief zone 1111 is a structurally weak area of the first wall 111. Further, the pressure relief zone 1111 is formed with an I-shaped notch 11111, and the notch 11111 is integrally formed on the first wall 111, and the maximum length dimension L1 of the pressure relief zone 1111 is the maximum length dimension of the notch 11111 in the second direction Y, and the maximum width dimension W1 of the pressure relief zone 1111 is the maximum width dimension of the notch 11111 in the third direction Z, and the pressure relief area S of the pressure relief zone 1111 is the product of L1 and W1.

[0238] In addition, a groove is formed in the notch 11111, and the minimum distance between the bottom wall of the groove and the surface of the first wall 111 facing the battery cell assembly 12 is the minimum wall thickness D of the pressure relief area 1111. The length of the first wall 111 is L0, the width of the first wall 111 is W0, and the area A of the first wall 111 is the product of L0 and W0.

[0239] like Figures 6 - 8 As shown, the housing 11 includes a main housing 112 and an end cover 113. The main housing 112 is open on one side in the first direction X. A receiving cavity 1121 for placing the battery cell assembly 12 is formed in the main housing 112. A pole 13 is arranged on the end cover 113. The adapter 14 is located between the end cover 113 and the battery cell assembly 12. The number of poles 13 and adapter 14 is two, and the poles 13 and adapter 14 are arranged one by one. The end cover 113 is sealed on the open side of the main housing 112. Further, the end cover 113 can be sealed on the open side of the main housing 112 by welding.

[0240] The battery cell assembly 12 is composed of a combination of anode / diaphragm / cathode in the form of winding or lamination. Furthermore, the gram capacity of the cathode material c1 ≥ 170 mAh / g (such as nickel cobalt manganese, nickel cobalt aluminum, nickel cobalt manganese aluminum, lithium cobalt oxide, etc.), and the gram capacity of the anode material c2 ≥ 350 mAh / g (such as graphite, silicon-doped anode, lithium metal, etc.).

[0241] The volume energy density E of the battery cell 10 is greater than or equal to 300Wh / L and less than or equal to 1000Wh / L, and the pressure relief area S of the pressure relief zone 1111 satisfies 100mm 2 ≤S≤2000mm 2, the minimum wall thickness D of the pressure relief area 1111 satisfies 0.1 mm ≤ D ≤ 3 mm, the volume energy density E of the battery cell 10 and the pressure relief area S of the pressure relief area 1111 satisfy 0.5 ≤ E / S ≤ 1, the volume energy density E of the battery cell 10 and the minimum wall thickness D of the pressure relief area 1111 satisfy 500 ≤ E / D ≤ 2000, and the area A of the first wall 111 and the pressure relief area S of the pressure relief area 1111 satisfy 1 / 15 ≤ S / A ≤ 1 / 10. In the length direction of the first wall 111, the maximum length dimension L1 of the pressure relief area 1111 and the length L0 of the first wall 111 satisfy 0.25 ≤ L1 / L0 ≤ 0.4. In the width direction of the first wall 111, the maximum width dimension W1 of the pressure relief area 1111 and the width W0 of the first wall 111 satisfy 0.25 ≤ W1 / W0 ≤ 0.75. In addition, the thickness of the end cap 113 is greater than or equal to 1.5 mm and less than or equal to 4 mm, and the wall thickness of the main shell 112 is greater than or equal to 0.1 mm and less than or equal to 4 mm.

[0242] In one specific embodiment, as Figure 3 , Figure 6 and Figure 9 shown, the number of the pressure relief areas 1111 is one, and the pressure relief area 1111 is arranged on the end cap 113. Further, the pressure relief area 1111 is formed with an I-shaped notch 11111, and the notch 11111 is integrally formed on the end cap 113. In another specific embodiment, as Figure 4 , Figure 7 and Figure 10 shown, the number of the pressure relief areas 1111 is one, and the pressure relief area 1111 is arranged on the bottom wall of the main shell 112. Further, the pressure relief area 1111 is formed with an I-shaped notch 11111, and the notch 11111 is integrally formed on the bottom wall of the main shell 112. In yet another specific embodiment, as Figure 5 , Figure 8 and Figure 11 shown, the number of the pressure relief areas 1111 is one, and the pressure relief area 1111 is arranged on the side wall of the main shell 112 in the second direction Y. Further, the pressure relief area 1111 is formed with an I-shaped notch 11111, and the notch 11111 is integrally formed on the side wall of the main shell 112 in the second direction Y.

[0243] When the above battery cell 10 undergoes thermal runaway, it can not only effectively reduce the risk of the housing 11 of the battery cell 10 bursting, but also effectively reduce the possibility of the pressure relief area 1111 being damaged by external thermal shock, thereby effectively improving the reliability of the battery cell 10.

[0244] Finally, it should be noted that 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, The volumetric energy density E of the battery cell (10) is greater than or equal to 300 Wh / L and less than or equal to 1000 Wh / L. The battery cell (10) includes: A housing (11), the housing (11) having a first wall (111), the first wall (111) being provided with a pressure relief area (1111), the pressure relief area (1111) being a structurally weak area of the first wall (111); A cell assembly (12), the cell assembly (12) being disposed within the housing (11), The pressure relief area (1111) is configured to satisfy: 100 mm 2 ≤S≤2000 mm 2 , and / or, 0.1 mm ≤ D ≤ 3 mm, where S is the pressure relief area of the pressure relief area (1111), in units of mm 2 ; D is the minimum wall thickness of the pressure relief area (1111), in units of mm.

2. The battery cell according to claim 1, characterized in that When the volume energy density E of the battery cell (10) is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief area (1111) is configured to satisfy: 100 mm 2 ≤S≤860 mm 2 , and / or, 0.1 mm ≤ D ≤ 1 mm.

3. The battery cell according to claim 2, wherein, When the volumetric energy density E of the battery cell (10) is greater than or equal to 300 Wh / L and less than or equal to 500 Wh / L, the pressure relief area (1111) is configured to satisfy: 200 mm 2 ≤S≤630 mm 2 and / or, 0.12 mm ≤ D ≤ 0.6 mm.

4. The battery cell according to claim 1, wherein When the volumetric energy density E of the battery cell (10) is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief area (1111) is configured to satisfy: 400 mm 2 ≤S≤1300 mm 2 and / or, 0.1 mm ≤ D ≤ 1.5 mm.

5. The battery cell according to claim 4, wherein, When the volume energy density E of the battery cell (10) is greater than 500 Wh / L and less than or equal to 800 Wh / L, the pressure relief area (1111) is configured to satisfy: 630 mm 2 ≤S≤1100 mm 2 and / or, 0.15 mm ≤ D ≤ 1 mm.

6. The battery cell according to claim 1, wherein When the volumetric energy density E of the battery cell (10) is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief area (1111) is configured to satisfy: 860 mm 2 ≤ S ≤ 2000 mm 2 and / or, 0.2 mm ≤ D ≤ 3 mm.

7. The battery cell according to claim 6, wherein When the volume energy density E of the battery cell (10) is greater than 800 Wh / L and less than or equal to 1000 Wh / L, the pressure relief area (1111) is configured to satisfy: 1100 mm 2 ≤ S ≤ 1500 mm 2 and / or, 0.4 mm ≤ D ≤ 2 mm.

8. The battery cell according to any one of claims 1-7, characterized in that, The area A of the first wall (111) and the pressure relief area S of the pressure relief area (1111) satisfy: 1 / 30 ≤ S / A ≤ 1 / 6.

9. The battery cell according to claim 8, wherein, The area A of the first wall (111) and the pressure relief area S of the pressure relief area (1111) satisfy: 1 / 15 ≤ S / A ≤ 1 / 10.

10. The battery cell according to any one of claims 1-7, characterized in that, In the length direction of the first wall (111), the maximum length dimension L1 of the pressure relief area (1111) and the length L0 of the first wall (111) satisfy: 0.1 ≤ L1 / L0 ≤ 0.

5.

11. The battery cell according to claim 10, wherein, The maximum length dimension L1 of the pressure relief area (1111) and the length L0 of the first wall (111) satisfy: 0.25 ≤ L1 / L0 ≤ 0.

4.

12. The battery cell according to any one of claims 1-7, characterized in that, In the width direction of the first wall (111), the maximum width dimension W1 of the pressure relief area (1111) and the width W0 of the first wall (111) satisfy: 0.2 ≤ W1 / W0 ≤ 0.

9.

13. The battery cell according to claim 12, characterized in that, The maximum width dimension W1 of the pressure relief area (1111) and the width W0 of the first wall (111) satisfy: 0.25 ≤ W1 / W0 ≤ 0.

75.

14. The battery cell according to any one of claims 1-7, characterized in that, The pressure relief area (1111) is formed with a notch (11111) or etching.

15. The battery cell according to any one of claims 1-7, characterized in that, The number of the pressure relief areas (1111) on the housing (11) is less than or equal to 4. When the number of the pressure relief areas (1111) is multiple, the multiple pressure relief areas (1111) are respectively disposed on the shell walls on different sides of the housing (11).

16. The battery cell according to claim 15, wherein, The number of the pressure relief areas (1111) is one or two.

17. The battery cell according to claim 16, characterized in that, The pressure relief area (1111) is disposed on the top wall and / or the bottom wall of the housing (11).

18. The battery cell according to any one of claims 1-7, characterized in that, The housing (11) includes a main housing (112) and an end cap (113). At least one side of the main housing (112) is open in the first direction (X), and the end cap (113) seals the open side of the main housing (112).

19. The battery cell according to claim 18, wherein, The thickness of the end cap (113) is greater than or equal to 1.5 mm and less than or equal to 4 mm.

20. The battery cell according to claim 18, wherein The wall thickness of the main housing (112) is greater than or equal to 0.1 mm and less than or equal to 4 mm.

21. The battery cell according to any one of claims 1-7, characterized in that, The first wall (111) is a component made of aluminum, steel, or titanium.

22. A battery device, characterized in that, Including the battery cell (10) according to any one of claims 1-21.

23. An electrical device, characterized in that, Including the battery device (100) according to claim 22.

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