Battery cell, battery device, and electric device

Abstract

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an electrode terminal, the shell comprises a shell body and connecting walls, the two ends, in the first direction, of the shell body are connected with the connecting walls correspondingly, and a containing cavity is defined by the shell body and the connecting walls; the electrode assembly is arranged in the accommodating cavity; the electrode terminal is arranged on any one of the case body and the connecting wall and is electrically connected with the electrode assembly; wherein the length size of the shell body in the first direction is D1, the length size of the connecting wall in the second direction is D2, D1 is larger than D2, the shell body is provided with a through hole communicated with the containing cavity, and the first direction intersects with the second direction. The embodiment of the invention is beneficial to improving the reliability of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, how to improve the reliability of individual battery cells is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which helps to improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising: a casing, including a casing body and connecting walls, wherein the casing body is connected to both ends of the connecting walls along a first direction, and the casing body and the connecting walls enclose a receiving cavity; an electrode assembly disposed in the receiving cavity; and an electrode terminal disposed in either the casing body or the connecting walls and electrically connected to the electrode assembly; wherein the length dimension of the casing body in the first direction is D1, the length dimension of the connecting walls in the second direction is D2, D1>D2, the casing body is provided with a through hole communicating with the receiving cavity, and the first direction and the second direction intersect.

[0006] In some embodiments of the first aspect, the battery cell includes a casing, an electrode assembly, and electrode terminals. The casing includes a casing body and a connecting wall. The casing body and the connecting wall enclose a cavity for accommodating the electrode assembly. The length of the casing body in a first direction is D1, and the length of the connecting wall in a second direction is D2, where D1 > D2. By providing a through hole communicating with the cavity on the casing body with the larger length dimension, the through hole can be used as an injection hole for injecting electrolyte into the cavity, allowing the electrolyte to flow along the second direction, thereby reducing the flow path of the electrolyte and ensuring injection efficiency and wetting effect of the electrode assembly. Alternatively, the through hole can also be used as a pressure relief hole for releasing pressure inside the cavity, allowing emissions from inside the battery cell to flow along the second direction, thereby reducing the flow path of the emissions and ensuring pressure relief efficiency. Alternatively, the number of through holes can be set to two or more, with one through hole serving as an injection hole and the other serving as a pressure relief hole, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the through-hole is configured as a liquid injection hole, and the casing body is also provided with pressure relief mechanisms spaced apart from the through-hole. This configuration allows for a balance between the liquid injection efficiency and pressure relief efficiency of the battery cell, thus ensuring the quality and reliability of the battery cell.

[0008] In some embodiments, the number of through holes is two or more, with at least one through hole configured as an injection hole and at least one through hole configured as a pressure relief hole. This configuration allows for a balance between the injection efficiency and pressure relief efficiency of the battery cell, thus ensuring the quality and reliability of the battery cell.

[0009] In some embodiments, along the first direction, the vertical distance from the center of the through hole to any connecting wall is D3, where 1 / 3 ≤ D3 / D1 ≤ 2 / 3. This arrangement allows the through hole to be positioned relatively centrally along the first direction within the shell body, improving versatility.

[0010] In some embodiments, one of the top wall and bottom wall, the connecting wall, and the side wall are integral structures, and the other of the top wall and bottom wall is provided with electrode terminals. This arrangement facilitates assembly.

[0011] In some embodiments, at least one connecting wall is provided with electrode terminals. This arrangement helps to improve the sealing performance of the housing.

[0012] In some embodiments, the battery cell further includes a flow guide frame disposed between the electrode assembly and the housing body. The flow guide frame divides the receiving cavity into a first cavity and a second cavity. The electrode assembly is disposed in the first cavity, and a through-hole communicates with the second cavity. At least one through-hole is configured as an injection port. The flow guide frame has two or more connecting holes that connect the first cavity and the second cavity. By providing the flow guide frame, the electrolyte can be prevented from directly impacting the electrode assembly, thus ensuring the safety of the electrode assembly and improving the reliability of the battery cell.

[0013] In some embodiments, two or more connecting holes are spaced apart along a first direction. This design helps to ensure the wetting effect of the electrode assembly.

[0014] In some embodiments, one of the connecting holes is configured as a positioning hole, and the injection hole is disposed opposite to the positioning hole, pointing from the positioning hole to any end of the guide frame along a first direction. The radial dimension of at least some of the connecting holes gradually increases, or the hole spacing between at least some adjacent connecting holes gradually decreases. This configuration helps to improve the uniformity of the injection, thereby ensuring the wetting effect of the electrode assembly.

[0015] In some embodiments, along the first direction, the hole spacing between two adjacent connecting holes is the same as the hole spacing between the positioning hole and the connecting hole facing the positioning hole. Starting from the positioning hole and pointing to any end of the guide frame along the first direction, the radial dimension of the connecting holes gradually increases, and the radial dimension of the positioning hole is smaller than the radial dimension of any connecting hole. This arrangement helps to ensure the wetting effect of the electrode assembly.

[0016] In some embodiments, the radial dimension of each connecting hole is the same as the radial dimension of the positioning hole. Starting from the positioning hole and pointing towards any end of the guide frame along the first direction, the hole spacing between adjacent connecting holes gradually decreases, and the hole spacing between any two connecting holes is smaller than the hole spacing between the positioning hole and the connecting hole facing the positioning hole. This arrangement helps to ensure the wetting effect of the electrode assembly.

[0017] In some embodiments, a partition plate is provided within the connecting hole, and the partition plate is connected to the flow guide and divides the connecting hole into two or more sub-holes. This design can prevent the electrolyte from directly impacting the electrode assembly, thus ensuring the safety of the electrode assembly.

[0018] In a second aspect, this application provides a battery device including a plurality of battery cells provided according to any embodiment of the first aspect.

[0019] Thirdly, this application provides an electrical device including a battery device according to any embodiment of the second aspect, the battery device being used to store or provide electrical energy.

[0020] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0023] Figure 2 This application provides an exploded structural diagram of a battery device according to some embodiments.

[0024] Figure 3This application provides a schematic diagram of the structure of a battery cell assembly according to some embodiments;

[0025] Figure 4 This is a schematic diagram of the structure of a single battery cell provided in some embodiments of this application;

[0026] Figure 5 This application provides an exploded structural diagram of a single battery cell for some embodiments.

[0027] Figure 6 This is a schematic diagram of the structure of the flow guide in a battery cell provided in some embodiments of this application;

[0028] Figure 7 A partial structural diagram of the flow guide in a battery cell provided in some embodiments of this application;

[0029] Figure 8 This is a schematic diagram of the structure of the flow guide in a battery cell provided in some other embodiments of this application;

[0030] Figure 9 A partial structural schematic diagram of the flow guide in a battery cell provided for other embodiments of this application;

[0031] Figure 10 This is a partial structural diagram of the flow guide in a battery cell provided in some embodiments of this application.

[0032] The reference numerals in the detailed embodiments are as follows:

[0033] 1000 - Vehicle; 1 - Battery unit; 2 - Controller; 3 - Motor; 1a - Battery cell assembly; 100 - Battery cell; 200 - Housing; 210 - First housing section; 220 - Second housing section;

[0034] 10-Outer shell; 101-Receiving cavity; 11-Shell body; 111-Top wall; 112-Bottom wall; 113-Side wall; 12-Connecting wall;

[0035] 110 - Through hole; 110a - Injection hole; 110b - Pressure relief hole;

[0036] 20 - Electrode assembly; 201 - Tab; 30 - Electrode terminal;

[0037] 40 - Flow guide; 401 - Connecting hole; 401a - Sub-hole; 4011 - Positioning hole;

[0038] 41 - Partition plate; 60 - Pressure relief cover;

[0039] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0040] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0041] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0042] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0043] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0047] The development of battery technology must consider multiple design factors simultaneously, such as battery life, energy density, discharge capacity, and charge / discharge rate. Additionally, the reliability of individual battery cells must also be considered.

[0048] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0049] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0050] In related technologies, the electrolyte injection port or explosion-proof valve of a single battery cell is typically located on a short side of the casing. During the electrolyte injection process, the electrolyte needs to flow along the length of the electrode assembly, severely impacting injection efficiency and electrode wetting. Furthermore, the electrode at the end furthest from the injection port often experiences poor wetting. During depressurization, the discharged material needs to flow along the length of the electrode assembly, resulting in a long path that significantly affects depressurization efficiency and can even lead to battery cell explosions.

[0051] To address the aforementioned technical problems, this application provides a battery cell comprising a casing, an electrode assembly, and electrode terminals. The casing includes a casing body and connecting walls. Connecting walls are respectively connected to both ends of the casing body along a first direction, forming a receiving cavity between the casing body and the connecting walls. The electrode assembly is disposed within the receiving cavity. The electrode terminals are disposed on either the casing body or the connecting walls and are electrically connected to the electrode assembly. The length of the casing body in the first direction is D1, and the length of the connecting wall in the second direction is D2, where D1 > D2. The casing body has a through hole communicating with the receiving cavity, and the first and second directions intersect.

[0052] By providing a through hole on the shell body with a larger length dimension that communicates with the receiving cavity, the through hole can be used as an injection hole for injecting liquid into the receiving cavity, and also as a pressure relief hole for releasing the pressure inside the receiving cavity. This allows the electrolyte or the discharge inside the battery cell to flow in a second direction, thereby reducing its flow path and improving the injection efficiency and pressure relief efficiency, which in turn helps to improve the reliability of the battery cell.

[0053] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0054] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use battery cells. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0055] For example, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a vehicle 1000 according to one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 can internally house a motor 3, a controller 2, and a battery device 1. The controller 2 controls the battery device 1 to supply power to the motor 3. For example, the battery device 1 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 1 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 1 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0056] Please see Figure 2 and Figure 3 The battery device 1 mentioned in the embodiments of this application may include one or more battery cell assemblies 1a for providing voltage and capacity. The battery cell assembly 1a may include multiple battery cells 100, which are connected in series, parallel or mixed connection through a busbar.

[0057] In some embodiments, the battery cell assembly 1a is typically formed by arranging a plurality of battery cells 100.

[0058] As an example, the battery cell assembly 1a can be a battery module, which is formed by arranging and fixing multiple battery cells 100 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 100 together with cable ties.

[0059] like Figure 2 As shown, in some embodiments, the battery device 1 may be a battery pack, which includes a housing 200 and one or more battery cell assemblies 1a, the battery cell assemblies 1a being housed in the housing 200.

[0060] As an example, the battery cell assembly 1a can be a battery module, and the battery cell assembly 1a can be housed in the housing 200 by fixing the battery module in the housing 200.

[0061] As an example, the battery cell assembly 1a can also be housed in the housing 200 by directly fixing multiple battery cells 100 to the housing 200.

[0062] As an example, the housing 200 may include a first housing 210 and a second housing 220. The first housing 210 and the second housing 220 are fastened together to form a closed space inside the housing 200 to house the battery cell assembly 1a. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 210 may be a top cover or a bottom plate.

[0063] As an example, the housing 200 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 the interior of the housing 200 forms an enclosed space to accommodate the battery cell assembly 1a.

[0064] In some embodiments, the housing 200 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 200 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 200 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0065] In this application, the battery cell 100 may include lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application are not limited to this.

[0066] As an example, the battery cell 100 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0067] Please see Figures 3 to 6 According to an embodiment of this application, a battery cell 100 is provided, including a housing 10, an electrode assembly 20, and electrode terminals 30.

[0068] The outer casing 10 is a component used to form the internal environment of the battery cell 100. The internal environment formed by the casing can be used to house the electrode assembly 20, as well as the electrolyte and other components. Optionally, the outer casing 10 can be, but is not limited to, made of metallic or non-metallic materials. For example, metallic materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, or polyvinyl chloride.

[0069] For example, the outer shell 10 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell 10), or an aluminum-plastic film, etc.

[0070] In some embodiments, the housing 10 can be a sealed structure or a non-sealed structure. As an example, when the housing 10 is a non-sealed structure, it serves to protect the electrode assembly 20, and a sealing bag is included between the housing 10 and the electrode assembly 20 to encapsulate the electrode assembly 20 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 10 is a sealed structure, it is used to encapsulate the electrode assembly 20 and the electrolyte, among other components.

[0071] The shape of the outer shell 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cuboid structure, a cuboid outer shell 10 can be selected; if the electrode assembly 20 is a cylindrical structure, a cylindrical outer shell 10 can be selected.

[0072] Electrode assembly 20 is a component in the battery cell 100 where an electrochemical reaction occurs, and the housing 10 may contain one or more electrode assemblies 20.

[0073] In some embodiments, the electrode assembly 20 may be cylindrical, flat, or polygonal in shape.

[0074] The electrode assembly 20 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0075] The electrode assembly 20 includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 100, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0076] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector. In some embodiments, the negative electrode can be a negative electrode sheet, which may include a negative electrode current collector.

[0077] In some embodiments, the electrode assembly 20 is provided with tabs 201, which can conduct current from the electrode assembly 20. Tabs 201 include a positive tab and a negative tab.

[0078] In some embodiments, the housing 10 is provided with at least one electrode terminal 30, which is electrically connected to the tab 201. The electrode terminal 30 can be directly connected to the tab 201, or it can be indirectly connected to the tab 201 through a current collector.

[0079] Electrode terminal 30 can be electrically connected to electrode assembly 20 for outputting or inputting electrical energy into battery cell 100. Electrode terminal 30 can be electrically connected to electrode assembly 200 by connecting to tab 201. Tab 201 electrically connected to electrode terminal 30 can be either positive or negative.

[0080] In some embodiments, the battery cell 100 also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements.

[0081] Please see Figures 3 to 5 According to an embodiment of this application, a battery cell 100 is provided, including a housing 10, an electrode assembly 20, and electrode terminals 30. The housing 10 includes a housing body 11 and connecting walls 12. The housing body 11 is connected to the connecting walls 12 at both ends along a first direction X, and the housing body 11 and the connecting walls 12 enclose a receiving cavity 101. The electrode assembly 20 is disposed in the receiving cavity 101. The electrode terminals 30 are disposed on either the housing body 11 or the connecting walls 12 and are electrically connected to the electrode assembly 20. The length dimension of the housing body 11 in the first direction X is D1, and the length dimension of the connecting wall 12 in the second direction Y is D2, where D1 > D2. The housing body 11 is provided with a through hole 110 communicating with the receiving cavity 101, and the first direction X and the second direction Y intersect.

[0082] In the embodiments of this application, the first direction X can be represented as the length direction of the electrode assembly 20, the second direction Y can be represented as the width direction of the electrode assembly 20, and the third direction Z can be represented as the thickness direction of the electrode assembly 20.

[0083] The outer shell 10 is used to house and protect the electrode assembly 20. The shell body 11 can be configured as a cylindrical structure with openings at both ends, and two connecting walls 12 respectively cover one opening to form a receiving cavity 101 together with the shell body 11 to house the electrode assembly 20. The shape of the connecting walls 12 can be circular, rectangular, elliptical or other shapes.

[0084] The electrode terminal 30 can be set on the housing body 11 or on the connecting wall 12.

[0085] A through hole 110 is provided in the shell body 11 to communicate with the receiving cavity 101. In some alternative embodiments, the number of through holes 110 may be one; in other alternative embodiments, the number of through holes 110 may be two, three, or even more.

[0086] In some alternative embodiments, the through hole 110 may be configured as an electrode lead-out hole so that the electrode terminal 30 can lead the electrical energy of the electrode assembly 20 to the outside of the housing 10; in some alternative embodiments, the through hole 110 may also be configured as an injection hole 110a so as to inject electrolyte into the receiving cavity 101; in some alternative embodiments, the through hole 110 may be configured as a pressure relief hole 110b so as to release emissions from the battery cell 100.

[0087] The battery cell 100 provided in some embodiments of this application has a shell body 11 with a length dimension D1 in the first direction X and a connecting wall 12 with a length dimension D2 in the second direction Y, where D1 > D2. By providing a through hole 110 communicating with the receiving cavity 101 on the shell body 11 with a larger length dimension, the through hole 110 can be used as an injection hole 110a for injecting electrolyte into the receiving cavity 101, so that the electrolyte can flow along the second direction Y to enter the receiving cavity 101, thereby reducing the flow path of the electrolyte, thereby improving the injection efficiency, ensuring the wetting effect of each part of the electrode assembly 20, and thus helping to improve the reliability of the battery cell 100.

[0088] Alternatively, the through hole 110 can also be used as a pressure relief hole 110b to release the pressure inside the containment cavity 101. The discharged material can flow out of the containment cavity 101 along the second direction Y, which can reduce the flow path of the discharged material, improve the pressure relief efficiency, and ensure that the pressure inside the containment cavity 101 is kept within the normal range, thereby improving the reliability of the battery cell 100.

[0089] The emissions from the battery cell 100 mentioned in this application embodiment include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0090] In some alternative embodiments, the through hole 110 is configured as a liquid injection hole 110a, and the shell body 11 is also provided with a pressure relief mechanism spaced apart from the through hole 110.

[0091] As an example, the internal pressure or temperature of the battery cell 100 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 100 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 100.

[0092] The pressure relief mechanism can be located at a weak point on the shell body 11. For example, the pressure relief mechanism can be integrally formed with the shell body 11. For example, the pressure relief mechanism can also be separately provided and connected to the shell body 11.

[0093] In this embodiment, "actuation" refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 100. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell 100 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 100 under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0094] In some embodiments, the number of through holes 110 is two or more, at least one through hole 110 is configured as an injection hole 110a, and at least one through hole 110 is configured as a pressure relief hole 110b.

[0095] Operators can inject electrolyte into the receiving cavity 101 through the injection port 110a, and emissions generated by the battery cell 100 can be discharged through the pressure relief port 110b.

[0096] By providing an injection hole 110a and a pressure relief hole 110b communicating with the receiving cavity 101 on the shell body 11, which has a larger length dimension, both the injection efficiency and the pressure relief efficiency can be improved, thereby improving the quality and reliability of the battery cell 100.

[0097] For example, the number of through holes 110 can be set to two, one of which can be used as an injection hole 110a, and the other can be used as a pressure relief hole 110b.

[0098] Optionally, the battery cell 100 also includes a sealing cap that covers the liquid filling hole 110a and is sealed to the housing body 11 to prevent leakage of the battery cell 100.

[0099] Optionally, the battery cell 100 also includes a pressure relief cover 60, which covers the liquid injection hole 110a and is sealed to the housing body 11, for actuation to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold.

[0100] like Figure 4 As shown, in some embodiments, along the first direction X, the vertical distance from the center of the through hole 110 to any connecting wall 12 is D3, where 1 / 3 ≤ D3 / D1 ≤ 2 / 3.

[0101] The center of the through hole 110 can be understood as the position of the center point or the center of gravity of the through hole 110. For example, when the shape of the through hole 110 is circular, the center of the through hole 110 is its circular point.

[0102] Along the first direction X, the ratio of the vertical distance D3 from the center of the through hole 110 to any connecting wall 12 to the length dimension D1 of the shell body 11, D3 / D1, satisfies: 1 / 3≤D3 / D1≤2 / 3. This can be understood as the shell body 11 being able to be divided into three parts of the same length dimension that are connected in sequence along the first direction X. For example, the shell body 11 can be divided into a first body part, a second body part, and a third body part of the same length dimension that are connected in sequence along the first direction X. The first body part is connected to one of the connecting walls 12, the third body part is connected to the other connecting wall 12, and the center of the through hole 110 is located in the second body part.

[0103] The through hole 110 may be located partly in the second body portion and partly in the first body portion or the third body portion, as long as its center is located in the second body portion; or, the through hole 110 may be entirely located in the second body portion.

[0104] This configuration allows the through hole 110 to be positioned relatively centrally along the first direction X of the shell body 11, which improves versatility.

[0105] For example, when the through hole 110 is configured as an injection hole 110a, this configuration allows the electrolyte to reach each position of the electrode assembly 20 more evenly, thereby ensuring the wetting effect of the electrode assembly 20.

[0106] For example, when the through hole 110 is configured as a pressure relief hole 110b, this configuration allows the discharge from each location of the receiving cavity 101 to flow more quickly to the pressure relief hole 110b for release, thereby ensuring the reliability of the battery cell 100.

[0107] The battery cell 100 provided in some embodiments of this application improves the liquid injection efficiency and / or pressure relief efficiency of the battery cell 100 by setting the ratio D3 / D1 of the vertical distance D3 from the center of the through hole 110 to any connecting wall 12 to the length dimension D1 of the shell body 11 between 1 / 3 and 2 / 3, including the two endpoint values ​​of 1 / 3 and 2 / 3, thereby improving the reliability of the battery cell 100.

[0108] As an example, along the first direction X, the ratio of the vertical distance D3 from the center of the through hole 110 to any connecting wall 12 to the length dimension D1 of the shell body 11, D3 / D1, can be, but is not limited to, 1 / 3, 4 / 9, 5 / 9, 2 / 3, etc.

[0109] Please see Figure 4 and Figure 5 In some optional embodiments, the shell body 11 includes a top wall 111 and a bottom wall 112 opposite each other along a third direction Z, and a side wall 113 connected between the top wall 111 and the bottom wall 112. The area of ​​the side wall 113 is smaller than the area of ​​either the top wall 111 or the bottom wall 112. A through hole 110 is provided in the side wall 113. The third direction Z intersects with the first direction X and the second direction Y.

[0110] The battery cell 100 provided in some embodiments of this application has a reasonable layout and is easy to process by providing through holes 110 on the small sidewall 113, which helps to reduce the manufacturing difficulty.

[0111] The sidewalls 113 can be configured as two, with the top wall 111 and the bottom wall 112 connected to a sidewall 113 at each end along the second direction Y to form a cylindrical structure.

[0112] The areas of the top wall 111 and the bottom wall 112 can be set to be different or different; the areas of the two side walls 113 connecting the top wall 111 and the bottom wall 112 can be set to be different or different.

[0113] For example, the top wall 111 and the bottom wall 112 both extend along the first direction X, and their areas are set to be the same. The two side walls 113 connecting the top wall 111 and the bottom wall 112 both extend along the third direction Z, and their areas are set to be the same.

[0114] Alternatively, at least one of the top wall 111 and the bottom wall 112 may extend in a direction inclined to the first direction X, and the two side walls 113 connecting the top wall 111 and the bottom wall 112 may extend in a third direction Z.

[0115] In some optional embodiments, through holes 110 are provided on the sidewall 113, and the number of through holes 110 is set to two or more, with the two or more through holes 110 distributed at intervals along the first direction X. This arrangement results in a reasonable layout and facilitates processing.

[0116] For example, the number of through holes 110 is set to two, one of which is configured as an injection hole 110a and the other is configured as a pressure relief hole 110b, with the injection hole 110a and the pressure relief hole 110b spaced apart along the first direction X.

[0117] Please see Figure 5 In some alternative embodiments, at least one connecting wall 12 is provided with an electrode terminal 30.

[0118] The battery cell 100 provided in some embodiments of this application, by being configured in the above manner, can make the opening formed by the shell body 11 smaller, which is convenient to ensure the sealing requirements of the outer shell 10 after the connecting wall 12 covers the opening, thereby helping to ensure the reliability of the battery cell 100, and also helping to improve assembly efficiency.

[0119] Optionally, the electrode terminals 30 can be all disposed on one connecting wall 12. Of course, each connecting wall 12 can be provided with electrode terminals 30.

[0120] For example, the electrode terminals 30 are all disposed on a connecting wall 12, and the electrode assembly 20 has a tab 201 extending from one end along the first direction X.

[0121] Please see Figure 5 In some optional embodiments, the battery cell 100 further includes a flow guide 40, which is disposed between the electrode assembly 20 and the housing body 11. The flow guide 40 divides the receiving cavity 101 into a first cavity and a second cavity. The electrode assembly 20 is disposed in the first cavity, and a through hole 110 communicates with the second cavity. At least one through hole 110 is configured as a liquid injection hole 110a. The flow guide 40 is provided with two or more connecting holes 401 that connect the first cavity and the second cavity.

[0122] The flow guide 40 is disposed in the receiving cavity 101 and divides the receiving cavity 101 into a first cavity and a second cavity. The first cavity is used to receive the electrode assembly 20.

[0123] During the process of injecting electrolyte into the battery cell 100, the electrolyte can enter the second chamber through the injection hole 110a and enter the first chamber through the connecting hole 401.

[0124] The battery cell 100 provided in some embodiments of this application, by setting a flow guide 40, can disperse the electrolyte in the second cavity and flow into the first cavity through the connecting hole 401, which can prevent the electrolyte from directly impacting the electrode assembly 20, so as to ensure the safety of the electrode assembly 20 and thus improve the reliability of the battery cell 100.

[0125] Furthermore, the flow guide 40 can also guide the electrolyte, allowing it to flow along the flow guide 40 and enter the second cavity through the connecting hole 401. This facilitates the electrolyte to flow to various parts of the electrode assembly 20 within the second cavity, ensuring a proper wetting effect on the electrode assembly 20.

[0126] Optionally, at least one through-hole 110 is configured as a pressure relief hole 110b, and a flow guide 40 is provided to achieve the function of sharing gas and liquid channels. It is understood that the emissions from the battery cell 100 are mostly gaseous.

[0127] For example, the flow guide 40 extends along the first direction X and is disposed between the electrode assembly 20 and the sidewall 113, dividing the receiving cavity 101 along the second direction Y into a first cavity and a second cavity.

[0128] This design reduces the volume of the flow guide 40 and the space occupied by the receiving cavity 101, which helps to reduce costs, improve processing efficiency, and increase the space utilization of the flow guide 40, thereby increasing the energy density of the battery cell 100.

[0129] In some alternative embodiments, the flow guide 40 abuts between the battery cell 100 and the housing body 11. Due to the limited area of ​​the receiving cavity 101, the flow guide 40 can be compressively supported between the electrode assembly 20 and the housing body 11.

[0130] The flow guide 40 can be abutted against the connecting wall 12, or there can be a gap between them.

[0131] In some alternative embodiments, the flow guide 40 is disposed between the electrode assembly 20 and the housing body 11, and is connected to the housing body 11.

[0132] The flow guide frame 40 can be connected to the shell body 11 by bonding or welding, or by fasteners such as bolts and studs.

[0133] In some embodiments, two or more connecting holes 401 are spaced apart along a first direction X. This arrangement results in a reasonable layout and facilitates manufacturing.

[0134] This configuration also allows the electrolyte to flow to both sides of the electrode assembly 20 along the first direction X under the guidance of the flow guide 40, which helps to ensure the wetting effect of the electrode assembly 20.

[0135] Optionally, the flow guide 40 can be made of insulating and electrolyte-resistant plastic material, or it can be made of insulating ceramic, anodized aluminum, insulating carbon fiber, etc. This application does not limit this.

[0136] Please see Figures 5 to 10 In some alternative embodiments, one of the connecting holes 401 is configured as a positioning hole 4011, and the injection hole 110a is disposed opposite to the positioning hole 4011, pointing from the positioning hole 4011 to any end of the guide frame 40 along the first direction X. The radial dimension of at least some of the connecting holes 401 gradually increases, or the hole spacing between at least some of the adjacent connecting holes 401 gradually decreases.

[0137] One of the connecting holes 401 is configured as a positioning hole 4011. The injection hole 110a is set opposite to the positioning hole 4011. It can be understood that there is a connecting hole 401 set opposite to the injection hole 110a, and this connecting hole 401 is used as a reference point. For ease of description, this connecting hole 401 is configured as a positioning hole 4011.

[0138] The relative arrangement of the injection hole 110a and the positioning hole 4011 can be understood as the overlapping positional relationship between the orthographic projections of the injection hole 110a and the positioning hole 4011 along a certain direction.

[0139] For example, when the top wall 111 is provided with an injection hole 110a and the flow guide 40 is disposed between the electrode assembly 20 and the top wall 111, in the first direction X, the orthographic projection of the injection hole 110a and the orthographic projection of the positioning hole 4011 overlap; or, when the side wall 113 is provided with an injection hole 110a and the flow guide 40 is disposed between the electrode assembly 20 and the side wall 113, in the second direction Y, the orthographic projection of the injection hole 110a and the orthographic projection of the positioning hole 4011 overlap.

[0140] The direction from the positioning hole 4011 to any end of the guide frame 40 along the first direction X can be understood as the direction from the positioning hole 4011 to any end of the guide frame 40 along the first direction X, wherein the direction from the positioning hole 4011 to one end of the guide frame 40 along the first direction X is opposite to the direction from the positioning hole 4011 to the other end of the guide frame 40 along the first direction X.

[0141] The gradual increase in the radial dimension of at least some of the connecting holes 401 can be understood as follows: there are a number of connecting holes 401 between the positioning hole 4011 and any end of the guide frame 40 along the first direction X. Starting from the positioning hole 4011 and pointing to any end of the guide frame 40 along the first direction X, there are a number of connecting holes 401 whose radial dimensions gradually increase, or all of the connecting holes 401 whose radial dimensions gradually increase. That is, the radial dimension of the connecting hole 401 farther from the positioning hole 4011 is greater than or equal to the radial dimension of the connecting hole 401 closer to the positioning hole 4011.

[0142] The gradual decrease in the hole spacing between at least some of the two adjacent connecting holes 401 can be understood as follows: there are a number of connecting holes 401 between the positioning hole 4011 and any end of the guide frame 40 along the first direction X. Starting from the positioning hole 4011 and pointing to any end of the guide frame 40 along the first direction X, there are a number of connecting holes 401 whose hole spacing gradually decreases, or all of the connecting holes 401 whose hole spacing gradually decreases.

[0143] The hole spacing can be understood as the distance between the centers of two adjacent connecting holes 401.

[0144] The battery cell 100 provided in some embodiments of this application, by being configured in the manner described above, can ensure that the electrolyte flowing in through the injection hole 110a can flow evenly to each position of the electrode assembly 20 along the first direction X, and can reduce the time difference of the electrolyte flowing to each position of the electrode assembly 20 along the first direction X, which is beneficial to improving the uniformity of electrolyte injection, so as to ensure the wetting effect of the electrode assembly 20, thereby helping to ensure the quality and reliability of the battery cell 100.

[0145] Furthermore, by setting it in the above manner, the time difference between the discharge from different positions of the electrode assembly 20 along the first direction X and the arrival at the pressure relief hole 110b can be reduced, which is beneficial to ensuring the safety of the battery cell 100.

[0146] Understandably, considering that the flow rate of liquid is less than that of gas, the flow guide 40 is designed with the injection hole 110a and the positioning hole 4011 facing each other. This can reduce the time difference between the electrolyte flowing to each position of the electrode assembly 20 along the first direction X, and also reduce the time difference between the discharge from different positions of the electrode assembly 20 along the first direction X reaching the pressure relief hole 110b.

[0147] Please see Figure 6 and Figure 7In some embodiments, along the first direction X, the hole spacing between two adjacent connecting holes 401 is the same as the hole spacing between the positioning hole 4011 and the connecting hole 401 facing the positioning hole 4011. Starting from the positioning hole 4011 and pointing to any end of the guide frame 40 along the first direction X, the radial dimension of the connecting hole 401 gradually increases, and the radial dimension of the positioning hole 4011 is smaller than the radial dimension of any connecting hole 401.

[0148] The hole distance between the positioning hole 4011 and the connecting hole 401 facing the positioning hole 4011 can be understood as the hole distance 00 between the positioning hole 4011 and the connecting hole 401 adjacent to the positioning hole 4011.

[0149] like Figure 7 As shown, the hole spacing between any two adjacent connecting holes 401 is the same, and the positioning hole 4011 and... Figure 7 The hole spacing between the connecting holes 401 on the left side and the positioning hole 4011 Figure 7 The hole spacing between the connecting holes 401 on the right side is also set to be the same as the hole spacing between two adjacent connecting holes 401. Based on this, the radial dimension of the connecting holes 401 on the left side of the positioning hole 4011 gradually increases, and the radial dimension of the connecting holes 401 on the right side of the positioning hole 4011 gradually increases, and the radial dimension of each connecting hole 401 is greater than the radial dimension of the positioning hole 4011.

[0150] By setting it in this way, when electrolyte is injected into the injection hole 110a, the time difference of electrolyte flowing from each connecting hole 401 to each position of the electrode assembly 20 along the first direction X can be reduced, so that electrolyte can flow evenly from the positioning hole 4011 and each connecting hole 401 to each part of the electrode assembly 20, thereby ensuring the wetting effect of the electrode assembly 20.

[0151] For example, such as Figure 7 As shown, the hole spacing between two adjacent connecting holes 401 is set to L, and the hole spacing between the positioning hole 4011 and the connecting hole 401 facing the positioning hole 4011 is also set to L. The radial dimension of the positioning hole 4011 is d1, starting from the positioning hole 4011 and pointing to any end of the guide frame 40 along the first direction X. The radial dimension of the first connecting hole 401 is d2, and the radial dimension of the second connecting hole 401 is d3, where d3 > d2 > d1.

[0152] It is understandable that, for the sake of simplicity, the above only uses the comparison of the radial dimensions of the positioning hole 4011 and the two connecting holes 401 as an example. However, it should be known that the number of the first connecting holes 401 can be set to two or more.

[0153] Please see Figure 8 and Figure 9In some embodiments, the radial dimension of each connecting hole 401 is the same as the radial dimension of the positioning hole 4011. Starting from the positioning hole 4011, pointing to any end of the guide frame 40 along the first direction X, the hole distance between two adjacent connecting holes 401 gradually decreases, and the hole distance between any two connecting holes 401 is smaller than the hole distance between the positioning hole 4011 and the connecting hole 401 facing the positioning hole 4011.

[0154] like Figure 9 As shown, the radial dimension of each connecting hole 401 is the same as the radial dimension of the positioning hole 4011. Based on this, for the part of the connecting holes 401 located to the left of the positioning hole 4011, the hole distance between two adjacent connecting holes 401 gradually decreases. For the part of the connecting holes 401 located to the right of the positioning hole 4011, the hole distance between two adjacent connecting holes 401 gradually decreases. Moreover, the hole distance between any two connecting holes 401 is less than the hole distance between the positioning hole 4011 and the connecting hole 401 located towards the positioning hole 4011.

[0155] By setting it in this way, the time difference of electrolyte flowing from each connecting hole 401 to each position of the electrode assembly 20 along the first direction X can be reduced, so that the electrolyte can flow evenly from the positioning hole 4011 and each connecting hole 401 to each part of the electrode assembly 20, thereby ensuring the wetting effect of the electrode assembly 20.

[0156] For example, such as Figure 9 As shown, the radial dimensions of both the positioning hole 4011 and the connecting hole 401 are set to d, and the hole distance between the positioning hole 4011 and the connecting hole 401 facing the positioning hole 4011 is also set to L1. Starting from the positioning hole 4011 and pointing to any end of the guide frame 40 along the first direction X, the hole distance between the first connecting hole 401 and the second connecting hole 401 is L2, and the hole distance between the second connecting hole 401 and the third connecting hole 401 is L3, where L1 > L2 > L3.

[0157] like Figure 10 As shown, in some embodiments, a partition plate 41 is provided inside the connecting hole 401. The partition plate 41 is connected to the flow guide 40 and divides the connecting hole 401 into two or more sub-holes 401a.

[0158] The partition plate 41 is disposed in the connecting hole 401 to connect with the flow guide 40. The number of partition plates 41 can be one, two, or multiple.

[0159] By setting the separator plate 41, the electrolyte can be diverted by the separator plate 41 and flow into the first cavity through two or more sub-holes 401a, so that the electrolyte is buffered to avoid it directly impacting the electrode assembly 20, which helps to ensure the safety of the electrode assembly 20 and thus improves the reliability of the battery cell 100.

[0160] According to some embodiments of this application, this application also provides a battery device 1, including the battery cell 100 provided in any of the above embodiments.

[0161] According to some embodiments of this application, this application provides an electrical device including a battery device 1 provided in any of the above embodiments, the battery device 1 being used to store or provide electrical energy.

[0162] Please see Figures 4 to 10 This application provides a battery cell 100, including a housing 10, an electrode assembly 20, electrode terminals 30, a current guide 40, and an insulating support 50.

[0163] The outer casing 10 includes a casing body 11 and connecting walls 12. The casing body 11 has connecting walls 12 at both ends along a first direction X, forming a receiving cavity 101 between the casing body 11 and the connecting walls 12. The electrode assembly 20 is disposed in the receiving cavity 101. The casing body 11 includes a top wall 111 and a bottom wall 112 opposite each other along a third direction Z, and a side wall 113 connecting the top wall 111 and the bottom wall 112. The area of ​​the side wall 113 is smaller than the area of ​​either the top wall 111 or the bottom wall 112. The side wall 113 has a through hole 110 communicating with the receiving cavity 101. The electrode terminal 30 is disposed on either the top wall 111 or the bottom wall 112 and electrically connected to the electrode assembly 20. The number of through holes 110 is two or more, at least one through hole 110 is configured as an injection hole 110a, and at least one through hole 110 is configured as a pressure relief hole 110b.

[0164] The shell body 11 has a length dimension of D1 in the first direction X, and the connecting wall 12 has a length dimension of D2 in the second direction Y. D1 > D2. The vertical distance from the center of the through hole 110 to any connecting wall 12 along the first direction X is D3, 1 / 3 ≤ D3 / D1 ≤ 2 / 3. The third direction Z intersects with the first direction X and the second direction Y.

[0165] A flow guide 40 is disposed between the electrode assembly 20 and the side wall 113. The flow guide 40 divides the receiving cavity 101 into a first cavity and a second cavity. The electrode assembly 20 is disposed in the first cavity, and the through hole 110 communicates with the second cavity. The flow guide 40 has two or more connecting holes 401 that connect the first cavity and the second cavity. The two or more connecting holes 401 are spaced apart along the first direction X. A partition plate 41 is disposed in the connecting hole 401. The partition plate 41 is connected to the flow guide 40 and divides the connecting hole 401 into multiple sub-holes 401a.

[0166] One of the connecting holes 401 is configured as a positioning hole 4011. The injection hole 110a is positioned opposite to the positioning hole 4011. Along the first direction X, the hole distance between two adjacent connecting holes 401 is the same as the hole distance between the positioning hole 4011 and the connecting hole 401 facing the positioning hole 4011. Starting from the positioning hole 4011 and pointing to any end of the guide frame 40 along the first direction X, the radial dimension of the connecting hole 401 gradually increases, and the radial dimension of the positioning hole 4011 is smaller than the radial dimension of any connecting hole 401.

[0167] Alternatively, the radial dimension of each connecting hole 401 is the same as the radial dimension of the positioning hole 4011. Starting from the positioning hole 4011, pointing to any end of the guide frame 40 along the first direction X, the hole distance between two adjacent connecting holes 401 gradually decreases, and the hole distance between any two connecting holes 401 is smaller than the hole distance between the positioning hole 4011 and the connecting hole 401 facing the positioning hole 4011.

[0168] It should be noted that all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell includes a shell body and connecting walls. The shell body is connected to the connecting walls at both ends along a first direction, and the shell body and the connecting walls enclose a receiving cavity. Electrode assembly is disposed in the receiving cavity; Electrode terminals are disposed on either the shell body or the connecting wall and are electrically connected to the electrode assembly; Wherein, the length dimension of the shell body in the first direction is D1, the length dimension of the connecting wall in the second direction is D2, D1>D2, the shell body is provided with a through hole communicating with the receiving cavity, and the first direction and the second direction intersect.

2. The battery cell according to claim 1, characterized in that, The through hole is configured as a liquid injection hole, and the shell body is also provided with a pressure relief mechanism that is spaced apart from the through hole.

3. The battery cell according to claim 1, characterized in that, The number of through holes is two or more, at least one of the through holes is configured as a liquid injection hole, and at least one of the through holes is configured as a pressure relief hole.

4. The battery cell according to claim 3, characterized in that, Along the first direction, the vertical distance from the center of the through hole to any of the connecting walls is D3, where 1 / 3 ≤ D3 / D1 ≤ 2 / 3.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The shell body includes a top wall and a bottom wall opposite each other along a third direction, and a side wall connecting the top wall and the bottom wall. The area of ​​the side wall is smaller than the area of ​​either the top wall or the bottom wall. The through hole is provided in the side wall. The third direction intersects with the first direction and the second direction.

6. The battery cell according to any one of claims 1 to 5, characterized in that, At least one of the connecting walls is provided with the electrode terminal.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The battery cell also includes a flow guide frame, which is disposed between the electrode assembly and the housing body. The flow guide frame divides the receiving cavity into a first cavity and a second cavity. The electrode assembly is disposed in the first cavity. The through hole communicates with the second cavity, and at least one of the through holes is configured as a liquid injection hole. The flow guide frame has two or more communicating holes that connect the first cavity and the second cavity.

8. The battery cell according to claim 7, characterized in that, Two or more of the connecting holes are spaced apart along the first direction.

9. The battery cell according to claim 8, characterized in that, One of the connecting holes is configured as a positioning hole, and the injection hole is disposed opposite to the positioning hole. The positioning hole points to any end of the guide frame along the first direction. The radial dimension of at least some of the connecting holes gradually increases, or the hole spacing between at least some of the adjacent connecting holes gradually decreases.

10. The battery cell according to claim 9, characterized in that, Along the first direction, the hole spacing between two adjacent connecting holes is the same as the hole spacing between the positioning hole and the connecting hole facing the positioning hole. Starting from the positioning hole and pointing to any end of the guide frame along the first direction, the radial dimension of the connecting hole gradually increases, and the radial dimension of the positioning hole is smaller than the radial dimension of any one of the connecting holes.

11. The battery cell according to claim 9, characterized in that, The radial dimension of each of the connecting holes is the same as that of the positioning hole. Starting from the positioning hole and pointing to any end of the guide frame along the first direction, the hole distance between two adjacent connecting holes gradually decreases, and the hole distance between any two connecting holes is less than the hole distance between the positioning hole and the connecting hole facing the positioning hole.

12. The battery cell according to any one of claims 7 to 11, characterized in that, A partition plate is provided inside the connecting hole. The partition plate is connected to the flow guide and divides the connecting hole into two or more sub-holes.

13. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1 to 12.

14. An electrical appliance, characterized in that, Includes the battery device as described in claim 13, the battery device being used to store or provide electrical energy.

Images