Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and an electric equipment. The battery monomer comprises a shell, a first wall of the shell is provided with a plurality of first connecting pieces; an electrode terminal is located at a mounting area of the first wall, and the orthographic projection of the plurality of first connecting pieces and the orthographic projection of the mounting area do not overlap on the inner surface of the first wall; an insulating piece comprises a plurality of second connecting pieces, the second connecting pieces are matched with the first connecting pieces; an electrode assembly; a switching piece is located at the side of the insulating piece facing the inside of the battery monomer, the switching piece is used for electrically connecting the electrode terminal and the tab of the electrode assembly, and the partial area of the switching piece is correspondingly arranged in the area between the two first connecting pieces adjacent to each other in the plurality of first connecting pieces, and the two first connecting pieces are respectively located at the two sides of the mounting area along the length direction of the first wall. The battery monomer, the battery device and the electric equipment provided by the application can improve the reliability and stability of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery cell, a battery device, and an electrical appliance. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. Improving battery safety has always been a research focus in battery device technology. Utility Model Content

[0003] This application provides a battery cell, a battery device, and an electrical appliance, which can improve the reliability and stability of the battery cell.

[0004] In a first aspect, a battery cell is provided, comprising: a housing having a cavity structure, the housing including a first wall, wherein a plurality of first connectors are disposed on the side of the first wall facing the interior of the battery cell; electrode terminals located in a mounting area of ​​the first wall, the mounting area being a portion of the first wall covered by the orthographic projection of the electrode terminals on the surface of the first wall facing the interior of the battery cell; wherein, on the surface of the first wall facing the interior of the battery cell, the orthographic projections of the plurality of first connectors do not overlap with the orthographic projection of the mounting area; and an insulating member located on the first wall facing the interior of the battery cell. On one side, a plurality of second connectors are provided on the side of the insulating member facing the first wall. The second connectors cooperate with the first connectors to connect the first wall and the insulating member. An electrode assembly is housed in the cavity of the housing. The electrode assembly includes tabs. An adapter piece is located on the side of the insulating member facing the interior of the battery cell. The adapter piece is used to electrically connect the electrode terminal and the tab. A portion of the adapter piece is correspondingly disposed in the area between two adjacent first connectors among the plurality of first connectors. The two first connectors are respectively located on both sides of the mounting area along the length direction of the first wall.

[0005] Therefore, in the battery cell of this embodiment, multiple first connectors provided on the first wall cooperate with multiple second connectors provided on the insulating member to connect and fix the insulating member and the first wall together, resulting in a simple and easy-to-implement structure. Furthermore, the mounting area of ​​the first wall is used to mount electrode terminals. On the surface of the first wall facing the inside of the battery cell, the orthographic projection of the mounting area does not overlap with the orthographic projection of the multiple first connectors, meaning that no first connectors are provided in this mounting area. Therefore, along the length of the first wall, to avoid the mounting area, the distance between two adjacent first connectors on either side of the mounting area is usually large. This can be addressed by providing a portion of an adapter piece corresponding to the area between the two first connectors, thereby supporting the insulating member through this portion of the adapter piece. In this way, when the insulating component swells and deforms, the first connector of the first wall and the second connector of the insulating component cooperate with each other to support the insulating component. Along the length of the first wall, for two adjacent first connectors located on both sides of the mounting area, the portion of the adapter piece corresponding to the area between the two first connectors can also be used to support the insulating component, thereby blocking the contact between the insulating component and the electrode assembly from various areas, reducing the possibility of the deformed insulating component being inserted into the electrode assembly, and thus reducing the possibility of short circuits between the positive and negative electrode plates leading to thermal runaway of the battery cell, thereby improving the reliability and stability of the battery cell.

[0006] In some embodiments, the first wall includes a plurality of spaced-apart first connectors along its length; and / or, the first wall includes a plurality of spaced-apart first connectors along its width. The spaced-apart first connectors can improve the support force at different locations of the insulating member, thereby reducing deformation caused by swelling of the insulating member due to immersion in electrolyte, thus reducing the possibility of a deformed insulating member being inserted into the electrode assembly, and consequently reducing the risk of thermal runaway in the battery cell. Furthermore, when multiple first connectors are provided along both the length and width directions of the first wall, it is equivalent to providing multiple first connectors around the circumferential position of the first wall, which can prevent deformation of the insulating member from occurring in various areas, thereby improving the reliability of the insulating member.

[0007] In some embodiments, the first connector is a groove, the second connector is a protrusion, and at least a portion of the second connector is accommodated within the first connector. The first connector satisfies at least one of the following conditions: the first connector and the second connector are riveted together; the minimum diameter of the first connector is in the range of [1mm, 6mm]; and the ratio of the depth of the first connector to the thickness of the first wall is in the range of [30%, 70%]. Setting the minimum diameter of the first connector to be greater than or equal to 1mm can improve the stability of the riveting between the first and second connectors and increase the structural strength. Setting the minimum diameter of the first connector to be less than or equal to 6mm can limit the diameter of different regions of the first connector, so that the size of the second connector within the first connector will not be too large, thereby reducing the processing difficulty of the second connector. For example, the second connector can be accommodated within the first connector by injection molding, limiting the size of the second connector to not be too large and facilitating the optimization of the molding effect of the second connector.

[0008] Setting the ratio of the depth of the first connector to the thickness of the first wall to be greater than or equal to 30% increases the depth of the first connector, thereby increasing the size of the portion of the second connector accommodated within the first connector. This improves the stability between the two connectors and effectively supports the insulating component. Setting the ratio of the depth of the first connector to the thickness of the first wall to be less than or equal to 70% limits the depth of the first connector, ensuring that the thickness of the bottom wall of the first connector in the area where it is located is not too small. This maintains the structural strength of the first wall, reduces the risk of deformation or even breakage under stress, and improves the reliability of the battery cell.

[0009] In some embodiments, the first connector satisfies at least one of the following conditions: the minimum distance between the first connector and the edge of the mounting area is greater than or equal to 5 mm; the minimum distance between the first connector and the edge of the first wall along the length direction of the first wall is greater than or equal to 4 mm; the minimum distance between the first connector and the edge of the first wall along the width direction of the first wall is greater than or equal to 4 mm; and the distance between two adjacent first connectors in a plurality of first connectors ranges from [10 mm, 35 mm]. By setting the above dimensions, the mutual influence between the first connector and the mounting area or two adjacent first connectors can be reduced, stress concentration can be reduced, and processing can be facilitated. For example, when the first connector is obtained by stamping, the influence of the processing of the first connector on the mounting area or the edge of the first wall can be reduced, and processing efficiency can be improved.

[0010] In some embodiments, the mounting area is a recessed structure on the first wall that protrudes towards the interior of the battery cell and has an opening away from the interior of the battery cell. The bottom wall of the mounting area is provided with electrode lead-out holes to allow the electrode terminals to be electrically connected to the adapter plate. By providing a mounting area with a recessed structure, the structural strength of the mounting area can be improved to support the electrode terminals and enhance their stability. Furthermore, the mounting area does not have a first connector to maintain its structural strength.

[0011] In some embodiments, the adapter includes a connected body portion and a first protrusion. Along the width direction of the first wall, the first protrusion protrudes from the body portion. The tab and the electrode terminal are connected to the body portion. The first protrusion is correspondingly disposed in the region between the two first connectors. The first protrusion protruding from the body portion can be used to support the insulating component; and it can also reduce the weight of the adapter, thereby increasing the energy density of the battery cell.

[0012] In some embodiments, the distance between the first protrusion and the insulating member along the thickness direction of the first wall ranges from 1 mm to 5 mm. Setting the distance between the first protrusion and the insulating member to be greater than or equal to 1 mm along the thickness direction of the first wall can increase the insulation between the first protrusion of the adapter piece and the first wall, reducing the risk of insulation failure; while setting the distance between the first protrusion and the insulating member to be less than or equal to 5 mm can improve the support capacity and support strength of the first protrusion for the insulating member, reducing the deformation of the insulating member.

[0013] In some embodiments, a first gap is formed between the body portion and the outer casing along the width direction of the first wall, the first protrusion is disposed within the first gap, and at least a portion of the tab is disposed within the first gap; within the range of the orthographic projection of the first gap in a plane perpendicular to the thickness of the first wall, the orthographic projection of the first protrusion and the orthographic projection of the tab do not overlap. After the tab is led out from the electrode body portion, at least a portion of the tab can also be located within the first gap to reuse the space where the first gap is located, which is beneficial to improving the internal space utilization of the battery cell and can reduce the height of the battery cell to increase the energy density of the battery cell. In addition, the orthographic projection of the first protrusion and the orthographic projection of the tab do not overlap, that is, the first protrusion does not directly contact the tab, or in other words, there is no overlap between the first protrusion and the tab along the thickness direction of the first wall. In this way, when the first protrusion supports the insulating member, when the first protrusion deforms toward the electrode body portion of the electrode assembly, the first protrusion is less likely to squeeze the tab, reducing the possibility that the tab may be inserted backwards into the electrode body portion due to compression and cause a short circuit in the electrode plate.

[0014] In some embodiments, within the plane perpendicular to the first wall thickness, the orthographic projection of at least one of the first connectors lies within the orthographic projection of the tab. Since the portion of the tab located within the first gap is closer to the insulator, and the electrolyte can relatively easily contact the insulator through the first gap, the area of ​​the insulator corresponding to the first gap is relatively prone to swelling and collapse. Therefore, within the range of the first gap, the insulator can be supported by the first protrusion, and at the position corresponding to the tab, the insulator can be supported by at least one first connector, reducing deformation of the insulator in this area. This reduces the likelihood of a deformed insulator inserting into the electrode assembly, lowers the possibility of a short circuit between the positive and negative electrodes leading to thermal runaway in the battery cell, and improves the reliability of the battery cell.

[0015] In some embodiments, the first protrusions are respectively provided on opposite sides of the body portion along the width direction of the first wall, and the first gaps are respectively formed between the opposite sides of the body portion and the outer shell. The first wall and the insulating member are usually symmetrically arranged. Therefore, the first protrusions are provided on both sides of the body portion where the adapter piece is provided, so that the adapter piece is also symmetrically arranged. This can balance the adapter piece and better support the insulating member, reducing the deformation of the insulating member.

[0016] In some embodiments, the adapter further includes a second protrusion connected to the body portion. The second protrusion is disposed within the first gap, and at least a portion of the tab is located between the first and second protrusions along the length of the first wall. The second protrusion can also be used to support an insulating component. Furthermore, the first and second protrusions can support the insulating component at different positions, increasing the effective support area of ​​the adapter for the insulating component and improving the stability and reliability of the adapter's support. Additionally, since at least a portion of the tab is located between the first and second protrusions, the arrangement of the first and second protrusions has a smaller impact on the tab, thereby improving the reliability of the battery cell.

[0017] In some embodiments, the body portion includes a recess with an opening facing the interior of the battery cell and protruding towards the electrode terminal; the bottom wall of the recess includes an electrode terminal connection area for electrical connection with the electrode terminal. This adapter with a first connector is suitable for scenarios where the distance between the electrode terminal and the tab is large along the height direction Z of the battery cell. The protrusion height of the recess can compensate for the distance difference between the electrode terminal and the tab, achieving electrical connection between the electrode terminal and the tab with minimal space occupied by the adapter within the battery cell.

[0018] In some embodiments, the recess satisfies the following conditions: the ratio of the thickness of the sidewall of the recess to the thickness of the area of ​​the body other than the recess is greater than or equal to 4 / 5; and / or, the included angle between the bottom wall and the sidewall of the recess is in the range of [91°, 130°]. Setting the ratio to be greater than or equal to 4 / 5 can improve the structural strength of the recess and reduce the risk of the sidewall of the recess breaking. Setting the included angle to be greater than or equal to 91° facilitates the processing of the recess, for example, it facilitates demolding; setting the included angle to be less than or equal to 130° can increase the size of the bottom wall of the recess, thereby increasing the size of the electrode terminal connection area, and thus improving the welding strength between the electrode terminal and the electrode terminal, thereby improving the reliability of the battery cell.

[0019] In some embodiments, the body portion includes a connection area and a non-connection area. The connection area includes an electrode terminal connection area and a tab connection area. The electrode terminal connection area is used for electrical connection with the electrode terminal, and the tab connection area is used for electrical connection with the tab. The thickness of the connection area is T6, and the thickness of the non-connection area is T5. The value range of (T5-T6) / T5 is [5%, 65%]. By setting the thinning rate (T5-T6) / T5 to be greater than or equal to 5%, the thickness of the connection area can be effectively reduced, facilitating welding, especially for through welding. Reducing the thickness of the connection area can improve welding quality and stability. Setting the thinning rate (T5-T6) / T5 to be less than or equal to 65% can ensure that the thickness of the connection area is not too thin, thereby improving the structural strength of the connection area, reducing the risk of adapter breakage, and also improving the current carrying capacity of the adapter, thereby improving the performance of the battery cell.

[0020] In some embodiments, the housing includes: a shell having an open cavity structure; and a cover plate for covering the opening, the cover plate being the first wall to facilitate processing and assembly.

[0021] In a second aspect, a battery device is provided, comprising: a plurality of battery cells, wherein the battery cells are those described in the first aspect or any embodiment of the first aspect.

[0022] Thirdly, an electrical device is provided, comprising: a battery device including a battery cell as described in the first aspect or any embodiment of the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0023] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a vehicle according to one embodiment of this application;

[0025] Figure 2This is an exploded view of a battery device according to an embodiment of this application;

[0026] Figure 3 This is an exploded structural diagram of a battery cell according to an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the structure of the first wall according to an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the structure of an insulating component according to an embodiment of this application;

[0029] Figure 6 This is a bottom view of the first wall and the adapter piece according to an embodiment of this application;

[0030] Figure 7 This is a cross-sectional schematic diagram of a partial structure of a battery cell according to an embodiment of this application;

[0031] Figure 8 This is a cross-sectional schematic diagram of a partial area of ​​the first wall with a groove, according to an embodiment of this application.

[0032] Figure 9 This is a bottom view of the first wall and the adapter piece according to another embodiment of this application;

[0033] Figure 10 This is a side view of a single battery cell according to an embodiment of this application;

[0034] Figure 11 This is a partial cross-sectional schematic diagram of a battery cell according to an embodiment of this application;

[0035] Figure 12 This is a bottom view of an adapter piece according to an embodiment of this application;

[0036] Figure 13 This is a bottom view of an adapter piece according to another embodiment of this application;

[0037] Figure 14 This is a cross-sectional schematic diagram of an adapter piece according to an embodiment of this application;

[0038] Figure 15 This is an enlarged view of a partial area of ​​the connection region in an embodiment of this application, where the embossing is provided.

[0039] Figure 16 This is a side view of an adapter piece according to another embodiment of this application.

[0040] The accompanying drawings are not drawn to scale. Detailed Implementation

[0041] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0048] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0049] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0050] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0051] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0052] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0053] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0054] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0055] 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.

[0056] 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.

[0057] A battery cell comprises a casing and a cover that fit together. The side of the cover facing inwards from the battery cell typically has an insulating component that isolates the electrode assembly from the cover. During battery cell use, there is a possibility that the electrolyte may come into contact with the insulating component. The insulating component in contact with the electrolyte may swell, causing localized deformation towards the electrode assembly. This deformed insulating component may insert into the electrode assembly, potentially causing a short circuit between the positive and negative electrode plates. When a short circuit occurs between the positive and negative electrode plates, the electrode assembly may experience thermal runaway, affecting the safety of the battery cell and the battery device comprising it.

[0058] Therefore, the battery cell, battery device, and electrical appliance of this application embodiment can solve the above-mentioned problems. The battery cell of this application embodiment includes a housing with a cavity structure. An insulating member is provided on one side of the housing facing the interior of the battery cell. A plurality of first connecting members are provided on the side of the first wall facing the interior of the battery cell. A plurality of second connecting members are provided on the side of the insulating member facing the first wall. The second connecting members cooperate with the first connecting members to connect the first wall and the insulating member, thereby fixing the insulating member and the first wall together. The structure is simple and easy to implement.

[0059] In addition, the battery cell also includes electrode terminals, electrode assemblies, and adapter plates. The electrode terminals are located in the mounting area of ​​the first wall, which is the portion of the first wall covered by the orthographic projection of the electrode terminals onto the surface of the first wall facing the interior of the battery cell. Furthermore, on the surface of the first wall facing the interior of the battery cell, the orthographic projections of multiple first connectors do not overlap with the orthographic projection of the mounting area. The electrode assemblies are housed within the cavity of the housing. The adapter plate is located on the side of the insulating member facing the interior of the battery cell, and this adapter plate is used to electrically connect the electrode terminals and the tabs of the electrode assembly. To avoid the mounting area, ensuring that the orthographic projections of the multiple first connectors on the surface of the first wall facing the interior of the battery cell do not overlap with the orthographic projection of the mounting area, the spacing between two adjacent first connectors located on either side of the mounting area along the length of the first wall is typically large. This can be achieved by setting a portion of the adapter plate corresponding to the area between these two first connectors, thereby supporting the insulating member through this portion of the adapter plate. In this way, when the insulating component swells and deforms, the first connector on the first wall and the second connector on the insulating component cooperate with each other to support the insulating component. Along the length of the first wall, for two adjacent first connectors located on both sides of the mounting area, the portion of the adapter piece corresponding to the area between the two first connectors can also be used to support the insulating component, thereby blocking the contact between the insulating component and the electrode assembly from various areas, reducing the possibility of the deformed insulating component being inserted into the electrode assembly, and thus reducing the possibility of short circuits between the positive and negative electrode plates leading to thermal runaway of the battery cell, thereby improving the reliability and stability of the battery cell.

[0060] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0061] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0062] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0063] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0064] Figure 2 An exploded view of the battery device 10 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The cylindrical shape shown, or it could be different. Figure 2 The embodiments shown may be cuboids or other shapes, but are not limited to these.

[0065] It should be understood that, such as Figure 2As shown, the battery device 10 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 20. The housing 11 of this embodiment has a hollow interior, and the multiple battery cells 20 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of the multiple battery cells 20 housed inside. At least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as... Figure 2 As shown, the first housing portion 111 and the second housing portion 112 can both be hollow cuboids with one open side each. The openings of the first housing portion 111 and the second housing portion 112 are opposite to each other, and the first housing portion 111 and the second housing portion 112 are interlocked to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the interlocking of the first housing portion 111 and the second housing portion 112.

[0066] For example, unlike Figure 2 As shown, either the first housing portion 111 or the second housing portion 112 may have only one hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with one opening and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0067] Figure 3 An exploded structural diagram of the battery cell 20 according to an embodiment of this application is shown. Figure 3 As shown, the battery cell 20 in this embodiment may include a housing 21.

[0068] In some embodiments, the material of the housing 21 can be chosen according to the actual application. For example, the housing 21 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing 21 can be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a non-sealed structure, the housing 21 serves to protect the electrode assembly 24, and a sealing bag is also included between the housing 21 and the electrode assembly 24. The sealing bag is used to encapsulate the electrode assembly 24 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 21 is a sealed structure, it is used to encapsulate the electrode assembly 24 and the electrolyte, etc.

[0069] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 20 of other shapes. Correspondingly, the casing 21 can have different shapes. Among them, the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, and a multi-prismatic battery, such as a hexagonal prismatic battery, etc. There are no particular limitations in this application.

[0070] For ease of explanation, such as Figure 3 As shown, this embodiment of the application takes a cuboid battery cell 20 as an example, and defines three directions based on the cuboid battery cell 20: the thickness direction X of the battery cell 20, the length direction Y of the battery cell 20, and the height direction Z of the battery cell 20. The thickness direction X, the length direction Y, and the height direction Z are perpendicular to each other, and the size of the battery cell 20 in its length direction Y is greater than the size in its thickness direction X.

[0071] In some embodiments, the battery cell 20 may include a housing 21 having a cavity structure. Different shapes of housing 21 correspond to different numbers of walls; for example, for a cuboid battery cell 20, its housing 21 is cuboid and includes six walls.

[0072] In some embodiments, the battery cell 20 further includes an electrode terminal 22 for electrical connection with the electrode assembly 24 inside the battery cell 20 to output electrical energy from the battery cell 20. The battery cell 20 may include at least one positive electrode terminal 221 and at least one negative electrode terminal 222.

[0073] In this embodiment of the application, all electrode terminals 22 of the battery cell 20 can be located on any one or more walls of the battery cell 20, that is, different electrode terminals 22 can be located on the same wall or different walls of the battery cell 20. For example, Figure 3 As shown, the embodiments of this application mainly take the battery cell 20 including two electrode terminals 22 as an example, and the two electrode terminals 22 are both located on the same wall of the battery cell 20. Here, it is taken that the two electrode terminals 22 are both located on the first wall 201 of the outer casing 21 as an example. The first wall 201 can be any wall of the outer casing 21, but the embodiments of this application are not limited to this.

[0074] Figure 4 A schematic diagram of the structure of the first wall 201 according to an embodiment of this application is shown. For example, the... Figure 4 The first wall 201 shown can be as follows: Figure 3 The battery cell 20 shown includes a first wall 201. (As...) Figure 4As shown, in this embodiment of the application, the electrode terminal 22 is located in the mounting area 2122 of the first wall 201. The mounting area 2122 is the portion of the first wall 201 covered by the orthographic projection of the electrode terminal 22 onto the surface of the first wall 201 facing the interior of the battery cell 20. For example, if the first wall 201 is provided with two electrode terminals 22, then the first wall 201 includes two mounting areas 2122, each mounting area 2122 being used to mount a corresponding electrode terminal 22. That is, the mounting area 2122 is the area of ​​the first wall 201 used to mount the electrode terminal 22. Specifically, on the inner surface of the first wall 201 facing the interior of the battery cell 20, the portion of the first wall 201 that can be covered by the orthographic projection of the electrode terminal 22 belongs to the mounting area 2122.

[0075] In some embodiments, the battery cell 20 includes an insulator 23 located on the side of the first wall 201 facing inwards from the battery cell 20. The insulator 23 can be used to isolate electrical connection components within the housing 21 from the first wall 201, for example, it can be used to isolate the electrode assembly 24 from the first wall 201 to reduce the risk of short circuits. Exemplarily, the insulator 23 can be made of plastic, rubber, etc., for ease of implementation.

[0076] Figure 5 A schematic diagram of the structure of the insulating member 23 according to an embodiment of this application is shown. For example, the... Figure 5 The insulating element 23 shown can be as follows: Figure 3 The battery cell 20 shown includes an insulating component 23. (As shown...) Figure 4 and Figure 5 As shown, a plurality of first connectors 2121 are provided on the side of the first wall 201 facing the interior of the battery cell 20; a plurality of second connectors 231 are provided on the side of the insulating member 23 facing the first wall 201. The second connectors 231 cooperate with the first connectors 2121 to connect the first wall 201 and the insulating member 23, so that the insulating member 23 and the first wall 201 can be fixed to each other. The structure is simple and easy to implement.

[0077] It should be understood that the specific structures of the first connector 2121 and the second connector 231 in the embodiments of this application can be set according to actual applications. For example, as Figure 4 and Figure 5 As shown, the first connector 2121 can be a groove, and the second connector 231 can be a protrusion; or, the first connector 2121 can be a protrusion, and the second connector 231 can be a groove. By accommodating at least a portion of the protrusion within the groove, the second connector 231 and the first connector 2121 can cooperate with each other, allowing the insulating member 23 and the first wall 201 to be connected and fixed together. For ease of explanation, this application embodiment mainly uses the first connector 2121 as a groove and the second connector 231 as a protrusion as an example, but this application embodiment is not limited to this.

[0078] In some embodiments, the battery cell 20 further includes an electrode assembly 24, which is housed within the cavity of the housing 21. The electrode assembly 24 includes tabs 242. The electrode assembly 24 consists of a positive electrode, a negative electrode, and a separator. For example, the electrode assembly 24 can be a wound structure, i.e., formed by winding the positive electrode, the negative electrode, and the separator; or, the electrode assembly 24 can be a stacked structure. The embodiments of this application are not limited thereto.

[0079] It should be understood that the battery cell 20 mainly relies on the movement of metal ions between the positive and negative electrode plates to operate. The positive electrode plate includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer, and the positive current collector without the positive active material layer serves as the positive electrode tab 2421. The negative electrode plate includes a negative current collector. The surface of the negative current collector may or may not be coated with a negative active material layer. Taking the case where a negative active material layer is coated as an example, the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer, and the negative current collector without the negative active material layer serves as the negative electrode tab 2422. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. In addition, the portion of the electrode assembly 24 to which the positive electrode active material layer is coated and the portion to which the negative electrode active material layer is coated are used to form the electrode body portion 241 of the electrode assembly 24.

[0080] The materials of the positive electrode, negative electrode, and separator in this application embodiment can be set according to actual applications. For example, taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc.

[0081] It should be understood that in this embodiment, the positive electrode terminal 221 is used for electrical connection with the positive electrode tab 2421, and the negative electrode terminal 222 is used for electrical connection with the negative electrode tab 2422. For example, the battery cell 20 also includes an adapter piece 25, which is located on the side of the insulating member 23 facing the interior of the battery cell 20. The adapter piece 25 is used for electrical connection between the electrode terminal 22 and the tab 242. For example, the positive electrode terminal 221 is electrically connected to the positive electrode tab 2421 through one adapter piece 25, and the negative electrode terminal 222 is electrically connected to the negative electrode tab 2422 through another adapter piece 25. The adapter piece 25 described below in this embodiment can refer to any one of the adapter pieces 25 included in the battery cell 20.

[0082] Figure 6 A bottom view schematic diagram of the first wall 201 and the adapter piece 25 according to an embodiment of this application is shown. For example, the... Figure 6 The first wall 201 and the adapter plate 25 shown can be as follows: Figure 3 The first wall 201 and the adapter plate 25 of the battery cell 20 are shown. Figures 3 to 6 As shown, on the surface of the first wall 201 facing the interior of the battery cell, the orthographic projections of the plurality of first connectors 2121 do not overlap with the orthographic projection of the mounting area 2122. The mounting area 2122 of the first wall 201 is used to mount the electrode terminals 22. Therefore, by setting the orthographic projection of the mounting area 2122 and the orthographic projections of the plurality of first connectors 2121 to not overlap, that is, the mounting area 2122 is not provided with first connectors 2121, the structural strength of the mounting area 2122 can be maintained.

[0083] Along the length of the first wall 201, for example, taking the length of the first wall 201 as the length direction X of the battery cell 20, in order to avoid the mounting area 2122, the distance between two adjacent first connectors 2121 on both sides of the mounting area 2122 is usually large. For example, in this embodiment of the application, taking the first wall 201 as having multiple first connectors 2121 including a first groove 21211 and a second groove 21212, along the length of the first wall 201, the first groove 21211 and the second groove 21212 are respectively located on both sides of the mounting area 2122, and the distance between the first groove 21211 and the second groove 21212 is large.

[0084] In this embodiment, a portion of the adapter piece 25 is disposed between two adjacent first connectors 2121, which are located on opposite sides of the mounting area 2122 along the length of the first wall 201. Specifically, a portion of the adapter piece 25 is disposed between the first groove 21211 and the second groove 21212 to support the insulating member 23. In this way, when the insulating component 23 deforms due to swelling caused by immersion in electrolyte, the first connector 2121 provided on the first wall 201 and the second connector 231 of the insulating component 23 cooperate with each other to support the insulating component 23. At the same time, along the length direction of the first wall 201, for the two first connectors 2121 located on both sides of the mounting area 2122, such as the first groove 21211 and the second groove 21212, the portion of the adapter piece 25 corresponding to the area between the two first connectors 2121 can also be used to support the insulating component 23, so as to prevent the insulating component 23 from deforming from various areas, that is, to prevent the insulating component 23 from contacting the electrode assembly 24, reducing the possibility of the deformed insulating component 23 being inserted into the electrode assembly 24, thereby reducing the possibility of short circuit between the positive electrode and the negative electrode, which could lead to thermal runaway of the battery cell 20, and thus improving the reliability and stability of the battery cell 20.

[0085] It should be understood that the first wall 201 in the embodiments of this application can be any wall of the outer shell 21.

[0086] In some embodiments, the housing 21 may include a housing 211 and a cover plate 212. The housing 211 has a cavity structure with an opening 2111; the cover plate 212 is used to cover the opening 2111. The housing 211 may have one or more openings 2111, and correspondingly, one or more cover plates 212 may be provided to cover each opening 2111. For ease of explanation, this embodiment of the application uses a housing 211 as an example with a cavity structure having an opening 2111 at one end, and one cover plate 212 is provided accordingly, but this embodiment of the application is not limited to this.

[0087] In some embodiments, the cover plate 212 may be a first wall 201 to facilitate the processing of various components disposed on the cover plate 212 and improve processing and assembly efficiency. For ease of description, the embodiments of this application and the corresponding drawings are described with the cover plate 212 as the first wall 201 as an example, but the embodiments of this application are not limited thereto.

[0088] It should be understood that the specific structure of the installation area 2122 in this embodiment can be set according to actual application. Figure 7 This illustration shows a partial cross-sectional view of a battery cell 20 according to an embodiment of this application. The cross-sectional view is perpendicular to the thickness direction Y of the battery cell 20. Figure 7At least a partial cross-sectional schematic diagram of the first wall 201 of the battery cell 20, the electrode terminal 22, the insulating member 23, and the adapter piece 25 is shown.

[0089] In some embodiments, such as Figure 7 As shown, the mounting area 2122 is a groove structure that protrudes from the first wall 201 toward the interior of the battery cell 20 and has an opening away from the interior of the battery cell 20. By providing a mounting area 2122 with a groove structure, the structural strength of the mounting area 2122 can be improved to support the electrode terminal 22 and improve the stability of the electrode terminal 22.

[0090] In some embodiments, different Figure 7 As shown, the mounting area 2122 can also be other structures. For example, the mounting area 2122 can be a recessed structure where the opening of the first wall 201 is away from the interior of the battery cell 20, and it differs from other structures. Figure 7 The mounting area 2122 shown may not protrude from the surface of the first wall 201 facing the interior of the battery cell 20, so that the surface of the first wall 201 facing the interior of the battery cell 20 is relatively flat.

[0091] In some embodiments, the mounting area 2122 may also be a groove structure with the opening of the first wall 201 facing the inside of the battery cell 20, and the bottom wall of the mounting area 2122 may protrude or not protrude from the surface of the first wall 201 facing the outside of the battery cell 20, so as to be suitable for different application scenarios. For example, it can be suitable for different types of electrode terminals 22 to facilitate the installation of the battery cell.

[0092] In the embodiments of this application, for different implementations of the mounting area 2122, the mounting area 2122 can be provided with an electrode lead-out hole 2123. For example, taking the mounting area 2122 as a groove structure, the electrode lead-out hole 2123 can be located on the bottom wall of the groove structure. The electrode terminal 22 and the adapter piece 25 can be electrically connected through the electrode lead-out hole 2123.

[0093] For example, at least a portion of the electrode terminal 22 may be accommodated within the electrode lead-out hole 2123, while the adapter piece 25 may not be accommodated within the electrode lead-out hole 2123. For example, the adapter piece 25 may be located on the side of the electrode lead-out hole 2123 facing the inside of the battery cell 20, so that the electrode terminal 22 can be electrically connected to the adapter piece 25 below, for example, it may be connected to the electrode terminal connection area 2513 of the adapter piece 25.

[0094] For example, at least a portion of the adapter piece 25 may be accommodated within the electrode lead-out hole 2123. For instance, at least a portion of the electrode terminal connection area 2513 of the adapter piece 25 may be accommodated within the electrode lead-out hole 2123, while the electrode terminal 22 may not be accommodated within the electrode lead-out hole 2123. For instance, the electrode terminal 22 may be located on the side of the electrode lead-out hole 2123 away from the interior of the battery cell 20, so that the adapter piece 25 can be electrically connected to the electrode terminal 22 above.

[0095] For example, a portion of the electrode terminal 22 is accommodated within the electrode lead-out hole 2123, and the adapter piece 25 can also be partially accommodated within the electrode lead-out hole 2123. For instance, at least a portion of the electrode terminal connection area 2513 of the adapter piece 25 is accommodated within the electrode lead-out hole 2123, so that the adapter piece 25 can be electrically connected to the electrode terminal 22 above.

[0096] Furthermore, the insulating member 23 is also provided with a through hole 232, through which the electrode terminal 22 and the adapter piece 25 are electrically connected via the electrode lead-out hole 2123 and the through hole 232 of the insulating member 23. For example, when the mounting area 2122 is a groove structure protruding from the first wall 201 toward the interior of the battery cell 20 and with its opening away from the interior of the battery cell 20, the insulating member 23 may also be provided with a groove structure with its opening toward the first wall 201. This groove structure of the insulating member is used to accommodate at least a portion of the mounting area 2122 protruding from the first wall 201, and the bottom wall of this groove structure is provided with a through hole 232 for realizing the electrical connection between the electrode terminal 22 and the adapter piece 25.

[0097] In some embodiments, at least a portion of the electrode terminal 22 may be accommodated within the through hole 232. For example, at least a portion of the electrode terminal 22 may pass through the electrode lead-out hole 2123 and be accommodated within the through hole 232, while the adapter piece 25 may not be accommodated within the through hole 232. For example, the adapter piece 25 may be located on the side of the through hole 232 facing the interior of the battery cell 20, so that the electrode terminal 22 can be electrically connected to the adapter piece 25 below, for example, it may be connected to the electrode terminal connection area 2513 of the adapter piece 25.

[0098] In some embodiments, at least a portion of the adapter piece 25 may be accommodated within the through hole 232. For example, at least a portion of the electrode terminal connection area 2513 of the adapter piece 25 may be accommodated within the through hole 232, while the electrode terminal 22 may not be accommodated within the through hole 232. For example, the electrode terminal 22 may be located on the side of the through hole 232 away from the interior of the battery cell 20, and may not be accommodated within the electrode lead-out hole 2123 or may be partially accommodated within the electrode lead-out hole 2123, so that the adapter piece 25 can be electrically connected to the electrode terminal 22 above.

[0099] In some embodiments, a portion of the electrode terminal 22 is accommodated within the through hole 232. For example, at least a portion of the electrode terminal 22 passes through the electrode lead-out hole 2123 and is accommodated within the through hole 232. At the same time, a portion of the adapter piece 25 may also be accommodated within the through hole 232. For example, at least a portion of the electrode terminal connection area 2513 of the adapter piece 25 is accommodated within the through hole 232, so that the adapter piece 25 can be electrically connected to the electrode terminal 22 above.

[0100] It should be understood that the battery cell 20 in this embodiment may also include other components. For example, such as Figures 3 to 7 As shown, the battery cell 20 may also include a pressure relief mechanism 26, which is actuated when the internal temperature or pressure of the battery cell 20 reaches a predetermined threshold to release the internal gas of the battery cell 20.

[0101] As an example, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 26 actuates or a weak structure within the pressure relief mechanism 26 is damaged, thereby creating an opening or channel for the internal pressure or temperature to be released. This threshold design varies depending on 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 20.

[0102] The term "actuation" as used in this application refers to the pressure relief mechanism 26 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 26 may include, but are not limited to: movement of components within the pressure relief mechanism 26 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 26, etc. When the pressure relief mechanism 26 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0103] As an example, the pressure relief mechanism 26 can be located on any wall of the battery cell 20. For example, in this embodiment, the pressure relief mechanism 26 is located on the first wall 201. For example, the first wall 201 can be provided with a first pressure relief area 2124, and the pressure relief mechanism 26 is located in the first pressure relief area 2124; correspondingly, the insulating member 23 can include a second pressure relief area 233, which can be used to isolate the pressure relief mechanism 26 from the electrode assembly 24 and electrolyte inside the battery cell 20, so as to protect the pressure relief mechanism 26 during normal use of the battery cell 20.

[0104] As an example, the pressure relief mechanism 26 can be integrally formed with the first wall 201; or, the pressure relief mechanism 26 can be separately set and connected with the first wall 201.

[0105] The emissions from the battery cell 20 mentioned in this application 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.

[0106] In some embodiments, such as Figures 3 to 7 As shown, the battery cell 20 may further include an electrolyte injection structure 27. Specifically, the first wall 201 is provided with a first electrolyte injection hole 2125, and correspondingly, the insulating member 23 is provided with a second electrolyte injection hole 234. The first electrolyte injection hole 2125 and the second electrolyte injection hole 234 are arranged opposite to each other to inject electrolyte into the battery cell 20 through the first electrolyte injection hole 2125 and the second electrolyte injection hole 234, and the first electrolyte injection hole 2125 and the second electrolyte injection hole 234 are sealed by the electrolyte injection structure 27.

[0107] The first connector 2121 of the first wall 201 of this application embodiment will now be described with reference to the accompanying drawings.

[0108] In some embodiments, along the length direction of the first wall 201, the first wall 201 includes a plurality of spaced-apart first connectors 2121; and / or, along the width direction of the first wall 201, the first wall 201 includes a plurality of spaced-apart first connectors 2121. For example, as Figures 3 to 7 As shown, taking the length direction of the first wall 201 as the length direction X of the battery cell 20 as an example, the first wall 201 includes a plurality of first connectors 2121 spaced apart; in addition, taking the width direction of the first wall 201 as the width direction Y of the battery cell 20 as an example, the first wall 201 includes a plurality of first connectors 2121 spaced apart.

[0109] By using multiple first connectors 2121 spaced apart, the supporting force at different positions of the insulating member 23 can be increased, thereby reducing the deformation of the insulating member 23 caused by swelling due to immersion in the electrolyte. This reduces the possibility of the deformed insulating member 23 being inserted into the electrode assembly 24, and thus reduces the risk of thermal runaway in the battery cell 20. Furthermore, when multiple first connectors 2121 are provided along both the length and width directions of the first wall 201, such as... Figures 3 to 7 As shown, this is equivalent to setting multiple first connectors 2121 around the circumferential position of the first wall 201, which can prevent the deformation of the insulating component 23 from various areas, thereby improving the reliability of the insulating component 23.

[0110] It should be understood that the dimensions and specific structure of the first connector 2121 in this application embodiment can be set according to actual applications. Taking the first connector 2121 as a groove as an example, Figure 8 This illustration shows a partial cross-sectional view of a portion of the first wall 201 of an embodiment of this application, where the first connector 2121 is provided. For example, the... Figure 8 It can be a cross-sectional view of any first connector 2121 provided on the first wall 201, and the cross-section is perpendicular to the thickness direction Y of the battery cell 20.

[0111] In some embodiments, one of the first connector 2121 and the second connector 231 is a protrusion and the other is a groove, such that at least a portion of the protrusion is accommodated in the groove. This allows the first connector 2121 and the second connector 231 to be riveted together, improving the stability between the first wall 201 and the insulator 23. For example, taking the first connector 2121 as a groove, along the thickness direction of the first wall 201, and taking the thickness direction of the first wall 201 as the height direction Z of the battery cell 20 as an example, different positions of the first connector 2121 can have different dimensions, allowing the first connector 2121 and the second connector 231 to be riveted together. Taking a circular first connector 2121 as an example, along the thickness direction of the first wall 201, by setting the diameter of the end of the first connector 2121 furthest from the insulator 23 to be the largest, and the diameter of the end closer to the insulator 23 to be relatively smaller, the second connector 231 of the insulator 23 can be accommodated within the first connector 2121, enabling riveting and thus mutual fixation.

[0112] In some embodiments, the minimum diameter R1 of the first connector 2121 ranges from [1mm, 6mm]. The position with the smallest diameter of the first connector 2121 along the thickness direction of the first wall 201 can be located at the end of the first connector 2121 facing the insulator 23, or as... Figure 8 As shown, the position with the smallest diameter of the first connector 2121 can also be located near the insulating member 23. In addition, the diameter R2 of the end of the first connector 2121 away from the insulating member 23 is larger than the smallest diameter R1 of the first connector 2121, so as to realize the riveting between the first connector 2121 and the second connector 231.

[0113] Setting the minimum diameter R1 of the first connector 2121 to be greater than or equal to 1 mm can improve the stability of the riveting between the first connector 2121 and the second connector 231, thereby increasing the structural strength. Setting the minimum diameter R1 of the first connector 2121 to be less than or equal to 6 mm can limit the diameter of different areas of the first connector 2121, ensuring that the size of the second connector 231 within the first connector 2121 is not too large, thus reducing the processing difficulty of the second connector 231. For example, the second connector 231 can be accommodated within the first connector 2121 by injection molding, limiting the size of the second connector 231 to be less than large and facilitating the optimization of the molding effect of the second connector 231.

[0114] In some embodiments, the minimum diameter R1 of the first connector 2121 can be any of the following values ​​or between any of the following values: 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mm, 4.8mm, 5mm, 5.3mm, 5.5mm, 5.8mm, or 6mm.

[0115] In some embodiments, the ratio T2 / T1 of the depth T2 of the first connector 2121 to the thickness T1 of the first wall 201 ranges from [30%, 70%]. Setting the ratio T2 / T1 to be greater than or equal to 30% increases the depth T2 of the first connector 2121, thereby increasing the size of the portion of the second connector 231 accommodated in the first connector 2121, thus improving the stability between the two and effectively supporting the insulating member 23. Setting the ratio T2 / T1 to be less than or equal to 70% limits the depth T2 of the first connector 2121, ensuring that the thickness of the bottom wall of the first connector 2121 in the area where it is located is not too small, thus maintaining the structural strength of the first wall 201, reducing the risk of deformation or even breakage of the first wall 201 under stress, and improving the reliability of the battery cell 20.

[0116] In some embodiments, the ratio T2 / T1 of the depth T2 of the first connector 2121 to the thickness T1 of the first wall 201 can be any of the following values ​​or between any of the following values: 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, or 70%.

[0117] It should be understood that the position of the first connector 2121 in this embodiment can be set according to the actual application.

[0118] In some embodiments, the minimum distance L1 between the first connector 2121 and the edge of the mounting area 2122 is greater than or equal to 5 mm. For example, as... Figures 3 to 8 As shown, taking the surface of the first wall 201 facing the insulating member 23 as an example, the mounting area 2122 is circular. The edge of the mounting area 2122 refers to the circumferential boundary line of the mounting area 2122. The minimum distance L1 between each first connector 2121 and the edge of the mounting area 2122 is greater than or equal to 5mm. This can reduce the mutual influence between the first connector 2121 and the mounting area 2122, reduce stress concentration, and facilitate processing. For example, when the first connector 2121 is obtained by stamping, the impact of the processing of the first connector 2121 on the mounting area 2122 can be reduced, and the processing efficiency can be improved.

[0119] In some embodiments, along the length direction of the first wall 201, the minimum distance L2 between the first connector 2121 and the edge of the first wall 201 is greater than or equal to 4 mm; and / or, along the width direction of the first wall 201, the minimum distance L3 between the first connector 2121 and the edge of the first wall 201 is greater than or equal to 4 mm. For example, as Figures 3 to 8 As shown, taking the length direction of the first wall 201 as the length direction X of the battery cell 20 as an example, the edge of the length direction of the first wall 201 refers to the two sides of the first wall 201 that are perpendicular to the length direction; taking the width direction of the first wall 201 as the width direction Y of the battery cell 20 as an example, the edge of the width direction of the first wall 201 refers to the two sides of the first wall 201 that are perpendicular to the width direction.

[0120] The minimum distance L2 and / or L3 between each first connector 2121 and each edge of the first wall 201 is greater than or equal to 4 mm. This facilitates the processing of the first connector 2121. For example, if the first connector 2121 is obtained by stamping, the deformation of the edge of the first wall 201 during the processing of the first connector 2121 can be reduced, thereby improving the processing efficiency and structural stability of the first wall 201.

[0121] In some embodiments, the distance L4 between any two adjacent first connectors 2121 is in the range of [10mm, 35mm]. Setting the distance L4 between any two adjacent first connectors 2121 to be greater than or equal to 10mm can reduce the mutual influence between the two first connectors 2121, thus facilitating processing. For example, when multiple first connectors 2121 are obtained by stamping, the risk of deformation in the area between two adjacent first connectors 2121 can be reduced, improving the processing efficiency and structural stability of the first wall 201. Setting the distance L4 between any two adjacent first connectors 2121 to be less than or equal to 35mm can increase the number of first connectors 2121, so that the deformation of the insulating member 23 can be blocked by the first connectors 2121 at different positions, thereby improving structural stability.

[0122] In some embodiments, the distance L4 between two adjacent first connectors 2121 can be any of the following values ​​or between any of the following values: 10mm, 13mm, 15mm, 18mm, 20mm, 23mm, 25mm, 28mm, 30mm, 33mm or 35mm.

[0123] It should be understood that, in the embodiments of this application, the distance between the first connector 2121 and other components refers to the distance between the center of the first connector 2121 and other components. For example, the minimum distance L1 between the first connector 2121 and the edge of the mounting area 2122 refers to the minimum distance L1 between the center of the first connector 2121 and the edge of the mounting area 2122.

[0124] In this embodiment, for the adjacent first groove 21211 and second groove 21212 located on both sides of the mounting area 2122, a portion of the adapter piece 25 corresponds to the area between the first groove 21211 and the second groove 21212. The specific shape of the adapter piece 25 can be set according to the actual application. For example, as... Figure 6 As shown, along the width direction Y of the battery cell 20, the width of the adapter piece 25 can be relatively wide, so that a portion of the edge of the adapter piece 25 corresponds to the area between the first groove 21211 and the second groove 21212. Furthermore, in the plane perpendicular to the height direction Z of the battery cell 20, a portion of the edge of the orthographic projection of the adapter piece 25 can also cover the orthographic projection of one or more first connectors 2121, so that this portion of the adapter piece 25 can be used together with the one or more first connectors 2121 to support the insulating member 23, thereby reducing the deformation of the insulating member 23.

[0125] For example, unlike Figure 6The embodiment shown can also be configured with adapter pieces 25 of other shapes. Figure 9 A bottom view schematic diagram of the first wall 201 and the adapter piece 25 according to another embodiment of this application is shown, for example, the Figure 9 The first wall 201 and the adapter plate 25 shown can be as follows: Figure 3 Another possible implementation of the first wall 201 of the battery cell 20 and the adapter piece 25 shown.

[0126] In some embodiments, the adapter piece 25 includes a connected body portion 251 and a first protrusion 252. Along the width direction of the first wall 201, the first protrusion 252 protrudes from the body portion 251. The tab 242 and the electrode terminal 22 are connected to the body portion 251. The first protrusion 252 corresponds to the area between two first connectors 2121, wherein the two first connectors 2121 are two adjacent first connectors 2121 located on both sides of the mounting area 2122 along the length direction of the first wall 201. Figure 9 As shown, taking the width direction of the first wall 201 as the width direction Y of the battery cell 20 as an example, the first protrusion 252 protrudes from the body portion 251, compared to... Figure 6 The illustrated embodiment can reduce the weight of the adapter piece 25, thereby increasing the energy density of the battery cell 20. Furthermore, taking two adjacent first connectors 2121 located on either side of the mounting area 2122 as a first groove 21211 and a second groove 21212 along the length of the first wall 201 as an example, the first protrusion 252 of the adapter piece 25 corresponds to the area between the first groove 21211 and the second groove 21212. This first protrusion 252 serves to support the insulating member 23 in the area corresponding to the first groove 21211 and the second groove 21212, thereby reducing deformation of the insulating member 23.

[0127] Figure 10 This illustration shows a side view of a battery cell 20 according to an embodiment of this application. Figure 10 It can be like Figure 3 The battery cell 20 shown; Figure 11 A partial cross-sectional schematic diagram of a battery cell 20 according to an embodiment of this application is shown. For example, the... Figure 11 It can be along Figure 10 The enlarged view of the cross-section along the A-A' direction shown includes the region of the battery cell 20 near the first wall 201, i.e., near the cover plate 212, and with this... Figure 11 Including, for example Figure 9 Take the adapter piece 25 shown as an example.

[0128] In some embodiments, the distance between the first protrusion 252 and the insulating member 23 along the thickness direction of the first wall 201 ranges from [1mm, 5mm]. For example, taking the adapter piece 25 as a flat plate structure, as... Figure 9 and Figure 11 As shown, taking the thickness direction of the first wall 201 as the height direction Z of the battery cell 20 as an example, the distance between the first protrusion 252 and the insulating member 23 can be equal to the distance L5 between the body part 251 and the insulating member 23, but the embodiments of this application are not limited to this.

[0129] By setting the distance between the first protrusion 252 and the insulating member 23 to be greater than or equal to 1 mm along the thickness direction of the first wall 201, the insulation between the first protrusion 252 and the first wall 201 of the adapter piece 25 can be increased, and the risk of insulation failure can be reduced. On the other hand, by setting the distance between the first protrusion 252 and the insulating member 23 to be less than or equal to 5 mm, the support capacity and support strength of the first protrusion 252 for the insulating member 23 can be improved, and the deformation of the insulating member 23 can be reduced.

[0130] In some embodiments, the distance between the first protrusion 252 and the insulating member 23 along the thickness direction of the first wall 201 can be any of the following values ​​or between any of the following values: 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mm, 4.8mm, or 5mm.

[0131] In some embodiments, the dimensions of the insulating member 23 can be set according to the actual application. For example, the thickness T3 of the insulating member can range from [0.1 mm to 1.0 mm]. A thickness T3 greater than or equal to 0.1 mm facilitates the processing and forming of the insulating member 23 and improves its insulation performance, reducing the risk of insulation failure of the battery cell 20. Conversely, a thickness T3 less than or equal to 1 mm limits the internal space occupied by the insulating member 23 in the battery cell 20, thereby increasing the energy density of the battery cell 20.

[0132] In some embodiments, the thickness T3 of the insulating element 23 can be any of the following values ​​or between the following values: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm.

[0133] In some embodiments, a first gap 2511 is formed between the body portion 251 and the outer casing 21 along the width direction of the first wall 201, a first protrusion 252 is disposed within the first gap 2511, and at least a portion of the tab 242 is disposed within the first gap 2511; within the range of the orthographic projection of the first gap 2511 in a plane perpendicular to the thickness of the first wall 201, the orthographic projection of the first protrusion 252 does not overlap with the orthographic projection of the tab 242. Figures 9 to 11 As shown, taking the width direction of the first wall 201 as the width direction Y of the battery cell 20 as an example, a first gap 2511 can be formed between the body portion 251 of the adapter piece 25 and the outer casing 21. A first protrusion 252, protruding along the width direction of the first wall 201, is located within this first gap 2511. For example, a second gap 2521 can be formed between the first protrusion 252 and the outer casing 21 along the width direction of the first wall 201, and the width of the second gap 2521 is smaller than the width of the first gap 2511.

[0134] In addition, after the tab 242 is led out from the electrode body 241, at least a part of the tab 242 can also be located in the first gap 2511 to reuse the space where the first gap 2511 is located. This is beneficial to improve the utilization rate of the internal space of the battery cell 20, and can reduce the height of the battery cell 20 to improve the energy density of the battery cell 20.

[0135] In some embodiments, such as Figures 9 to 11 As shown, taking the surface of the first wall 201 facing the insulating member 23 as an example, this surface is perpendicular to the thickness direction of the first wall 201. Within the range of the orthographic projection of the first gap 2511, the orthographic projection of the first protrusion 252 does not overlap with the orthographic projection of the tab 242. That is, the first protrusion 252 does not directly contact the tab 242, or in other words, there is no overlap between the first protrusion 252 and the tab 242 along the thickness direction of the first wall 201. In this way, when the first protrusion 252 supports the insulating member 23, and the first protrusion 252 deforms towards the electrode body 241 of the electrode assembly 24, the first protrusion 252 is less likely to squeeze the tab 242, reducing the possibility that the tab 242 may be inserted backward into the electrode body 241 due to being squeezed and cause a short circuit in the electrode.

[0136] In some embodiments, within the plane perpendicular to the thickness of the first wall 201, the orthographic projection of at least one first connector 2121 lies within the orthographic projection range of the tab 242, within the range of the orthographic projection of the first gap 2511. Figures 9 to 11 As shown, taking the surface of the first wall 201 facing the insulating member 23 as an example, this surface is perpendicular to the thickness direction of the first wall 201. Then, within the orthographic projection range of the first gap 2511, at least one first connector 2121 is provided within the orthographic projection range of the tab 242.

[0137] Because the portion of the tab 242 located in the first gap 2511 is closer to the insulator 23, and the electrolyte can relatively easily contact the insulator 23 through the first gap 2511, the area of ​​the insulator 23 corresponding to the first gap 2511 is relatively prone to swelling and collapse. Therefore, within the area of ​​the first gap 2511, on the one hand, the insulator 23 can be supported by the first protrusion 252; on the other hand, at the position corresponding to the tab 242, at least one first connector 2121 can be provided to support the insulator 23, reducing the deformation of the insulator 23 in this area. This reduces the possibility of a deformed insulator 23 inserting into the electrode assembly 24, and reduces the possibility of a short circuit between the positive and negative electrodes causing thermal runaway in the battery cell 20, thus improving the reliability of the battery cell 20.

[0138] It should be understood that the specific shape of the adapter piece 25 in this application embodiment can be set according to actual application. Examples will be provided below with reference to the accompanying drawings. Figure 12 A bottom view of the adapter piece 25 according to an embodiment of this application is shown. For example, the... Figure 12 The adapter shown can be as follows: Figure 9 Includes adapter plate 25.

[0139] It should be understood that the number of first protrusions 252 in the embodiments of this application can be set according to actual applications. In some embodiments, first protrusions 252 are respectively provided on opposite sides of the body portion 251 along the width direction of the first wall 201, and first gaps 2511 are formed between the opposite sides of the body portion 251 and the outer shell 21. Figure 12 As shown, taking the width direction of the first wall 201 as the width direction Y of the battery cell 20 as an example, the first wall 201 and the insulating member 23 are usually symmetrically arranged. Therefore, the body part 251 of the adapter piece 25 has a first protrusion 252 on both sides so that the adapter piece 25 is also symmetrically arranged. This can balance the adapter piece 25 and better support the insulating member 23, reducing the deformation of the insulating member 23.

[0140] Figure 13 A bottom view of an adapter piece 25 according to another embodiment of this application is shown, for example, the... Figure 13 The adapter piece 25 shown can be another possible implementation of the adapter piece 25 in the embodiments of this application.

[0141] In some embodiments, the adapter piece 25 further includes a second protrusion 253 connected to the body portion 251, the second protrusion 253 being disposed within the first gap 2511; along the length direction of the first wall 201, at least a portion of the tab 242 is located between the first protrusion 252 and the second protrusion 253. Figure 13As shown, the second protrusion 253 can also be used to support the insulating member 23. Furthermore, the first protrusion 252 and the second protrusion 253 can support the insulating member 23 at different positions, increasing the effective support area of ​​the adapter piece 25 on the insulating member 23, which is beneficial for improving the support stability and reliability of the adapter piece 25 on the insulating member 23. Additionally, at least a portion of the tab 242 is located between the first protrusion 252 and the second protrusion 253. For example, the portion of the tab 242 located in the first gap 2511 can be located between the first protrusion 252 and the second protrusion 253, making the arrangement of the first protrusion 252 and the second protrusion 253 have a smaller impact on the tab 242, thereby improving the reliability of the battery cell 20.

[0142] It should be understood that the arrangement of the second protrusion 253 in the embodiments of this application can be similar to that of the first protrusion 252. For example, the adapter piece 25 includes two first protrusions 252, and similarly, the adapter piece 25 may also include two second protrusions 253. Along the width direction of the first wall 201, the two second protrusions 253 are respectively located on both sides of the body portion 251.

[0143] For ease of description, the first protrusion 252 is used as an example in the embodiments of this application below, but the relevant description also applies to the second protrusion 253, and will not be repeated here for the sake of brevity.

[0144] It should be understood that the shape and size of the first protrusion 252 in this embodiment can be set according to actual application. For example, as Figure 12 and Figure 13 As shown, the first protrusion 252 can be rectangular or approximately rectangular to facilitate processing. Alternatively, the first protrusion 252 can also be serrated; for example, the side of the first protrusion 252 away from the main body 251 can also be serrated, allowing the first protrusion 252 to achieve a balance between its support performance for the insulating member 23 and its own weight. The first protrusion 252 can reduce its own weight while fulfilling its supporting function, which is beneficial for reducing the weight of the adapter piece 25 and increasing the energy density of the battery cell 20.

[0145] In some embodiments, the adapter piece 25 is provided with a foolproof chamfer 255 to facilitate installation of the adapter piece 25 and reduce the probability of incorrect installation. The chamfer 255 can be located at any corner of the adapter piece 25. For example, as... Figure 12 and Figure 13 As shown, the first protrusion 252 may be provided with a chamfer 255; or, the second protrusion 253 may also be provided with a chamfer 255, but the embodiments of this application are not limited thereto.

[0146] It should be understood that the chamfer 255 in the embodiments of this application can be a rounded corner or a chamfered corner, and its specific angle can be flexibly set according to the actual application.

[0147] It should be understood that the body part 251 in this embodiment is used to electrically connect the tab 242 and the electrode terminal 22, and its specific implementation can be set according to the actual application.

[0148] In this embodiment, the main body 251 includes a connection area 2515 and a non-connection area 2516. The connection area 2515 includes an electrode terminal connection area 2513 and a tab connection area 2514. The electrode terminal connection area 2513 is used to electrically connect with the electrode terminal 22, and the tab connection area 2514 is used to electrically connect with the tab 242, so as to realize the electrical connection of the adapter piece 25 with the tab 242 and the electrode terminal 22 respectively.

[0149] It should be understood that the specific connection method between the electrode terminal connection area 2513 and the electrode terminal 22 in the embodiments of this application can be set according to actual application; the specific connection method between the tab connection area 2514 and the tab 242 can also be set according to actual application. For example, the electrode terminal connection area 2513 and the electrode terminal 22 of the adapter piece 25 can be electrically connected by laser welding; as another example, the tab connection area 2514 and the tab 242 of the adapter piece 25 can be electrically connected by ultrasonic welding, but the embodiments of this application are not limited to these.

[0150] In some embodiments, such as Figure 12 and Figure 13 As shown, the non-connection area 2516 of the adapter piece 25 may also be provided with a notch area 254 to reduce the weight of the adapter piece 25.

[0151] In some embodiments, the connection area 2515 may include two tab connection areas 2514, which are located on both sides of the notch area 254 to increase the total area of ​​all tab connection areas 2514, so as to facilitate the electrical connection between the adapter piece 25 and the tab 242.

[0152] In some embodiments, the first wall 201 may be provided with an injection structure 27, which is provided corresponding to the notch area 254. That is, the first injection hole 2125 of the first wall 201 and the second injection hole 234 of the insulating member 23 are both provided corresponding to the notch area 254. When the battery cell 20 injects electrolyte through the first injection hole 2125 and the second injection hole 234, the adapter piece 25 can avoid the electrolyte through the notch area 254. This makes it less likely for the adapter piece 25 to block the electrolyte during the injection process, reducing the injection resistance of the electrolyte. This facilitates the smooth completion of the electrolyte injection through the first injection hole 2125 and the second injection hole 234, improving the injection efficiency.

[0153] It should be understood that the connection area 2515 in this embodiment of the application can be thinned compared to the non-connection area 2516 to facilitate welding. Figure 14 A cross-sectional schematic diagram of the adapter piece 25 according to an embodiment of this application is shown. Figure 14 The adapter piece 25 shown is one possible implementation of the adapter piece 25 in this application embodiment. The cross-section is perpendicular to the width direction of the adapter piece 25 and passes through the center of the adapter piece 25, wherein the width direction of the adapter piece 25 is the width direction Y of the battery cell 20.

[0154] In some embodiments, such as Figure 14 As shown, the thickness of the connecting area 2515 is T6, and the thickness of the non-connecting area 2516 is T5. The value range of (T5-T6) / T5 is [5%, 65%]. By setting the thinning rate (T5-T6) / T5 to be greater than or equal to 5%, the thickness of the connecting area 2515 can be effectively reduced, which facilitates welding. Especially for through welding, reducing the thickness of the connecting area 2515 can improve the welding quality and stability. Setting the thinning rate (T5-T6) / T5 to be less than or equal to 65% can ensure that the thickness of the connecting area 2515 is not too thin, thereby improving the structural strength of the connecting area 2515, reducing the risk of breakage of the adapter piece 25, and also improving the current carrying capacity of the adapter piece 25, thereby improving the performance of the battery cell 20.

[0155] In some embodiments, the value of the thinning rate (T5-T6) / T5 can be any of the following values ​​or between any of the following values: 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, or 65%.

[0156] In some embodiments, the connection area 2515 is provided with embossing. For example, embossing can be provided on the surface of the tab connection area 2514 facing the tab 242, and on the surface of the electrode terminal connection area 2513 facing the electrode terminal 22. Exemplarily, the embossing can be achieved by stamping to form regular raised and recessed patterns on the corresponding surfaces, such as dots, grids, stripes, etc. For example, in this embodiment, the embossing includes multiple raised structures 2517. By providing embossing, the contact area for welding can be increased, welding can be facilitated, and welding stability can be improved.

[0157] It should be understood that the specific dimensions of the plurality of raised structures 2517 included in the embossing of this application embodiment can be set according to actual application. Figure 15 An enlarged view of a portion of the connection area 2515 of this application embodiment is shown, in which an embossed pattern is provided. For example... Figure 15 As shown, each raised structure 2517 in the embossed area is a cuboid as an example.

[0158] In some embodiments, the protrusion height of each protrusion structure 2517 ranges from [0.03 mm to 0.2 mm]. A protrusion height greater than or equal to 0.03 mm can effectively improve the welding effect, while a protrusion height less than or equal to 0.2 mm reduces the risk of the protrusion structure 2517 damaging the surface of the tab 242 and the electrode segment 2, thereby improving structural stability.

[0159] In some embodiments, such as Figure 15 As shown, taking the length direction of the adapter piece 25 as the length direction X and the width direction Y of the battery cell 20, respectively, as an example, the dimensions D1*D2 of each protrusion structure 2517 are 0.4mm*0.4mm; the spacing D3*D3 between two adjacent protrusion structures 2517 is 0.5mm*0.5mm. By reasonably setting the dimensions of each protrusion structure 2517 and the spacing between multiple protrusion structures 2517, the welding effect and welding stability can be improved, thereby improving the reliability of the battery cell 20.

[0160] It should be understood that the shape of the adapter piece 25 in this embodiment can be set according to actual application. For example, the adapter piece 25 can be a flat structure, that is, both surfaces of the adapter piece 25 along its thickness direction are flat, so as to facilitate processing and installation. As another example, the adapter piece 25 can also be set as a partially protruding non-flat structure, so as to flexibly adapt to different application scenarios.

[0161] In some embodiments, the body portion 251 includes a recess 2512, the opening of which faces the interior of the battery cell 20, and the recess 2512 protrudes toward the electrode terminal 22; the bottom wall of the recess 2512 includes an electrode terminal connection region 2513 for electrical connection with the electrode terminal 22. Figures 12 to 14 As shown, along the height direction Z of the battery cell 20, the recess 2512 protrudes towards the electrode terminal 22, so that the electrode terminal connection area 2513 at the bottom of the recess 2512 can be electrically connected to the electrode terminal 22. This adapter piece 25 with the recess 2512 can be used in scenarios where the distance between the electrode terminal 22 and the tab 242 is large along the height direction Z of the battery cell 20. The protrusion height of the recess 2512 can compensate for the distance difference between the electrode terminal 22 and the tab 242, so as to achieve electrical connection between the electrode terminal 22 and the tab 242 with less space occupied by the adapter piece 25 inside the battery cell 20.

[0162] In some embodiments, the recess 2512 can be processed by stamping and stretching, but the embodiments of this application are not limited thereto.

[0163] It should be understood that the dimensions of the recess 2512 can be set according to the actual application.

[0164] In some embodiments, the ratio T4 / T5 of the thickness T4 of the sidewall of the recess 2512 to the thickness T5 of the area of ​​the body portion 251 excluding the recess 2512 is greater than or equal to 4 / 5, thereby improving the structural strength of the recess 2512 and reducing the risk of the sidewall of the recess 2512 breaking. Furthermore, this ratio T4 / T5 is typically less than 1, and considering that the recess 2512 is typically processed by stamping and stretching, the thickness T4 of the sidewall of the recess 2512 is reduced.

[0165] It should be understood that the thickness T5 of the area of ​​the body portion 251 other than the recess 2512 can refer to the thickness of the non-connection area 2516 as T5, that is, the thickness T4 of the sidewall of the recess 2512 is smaller than the thickness T5 of the non-connection area 2516.

[0166] In some embodiments, the included angle θ between the bottom wall and the side wall of the recess 2512 ranges from [91° to 130°]. Setting the included angle θ to be greater than or equal to 91° facilitates the processing of the recess 2512, for example, it facilitates drafting. Setting the included angle θ to be less than or equal to 130° can increase the size of the bottom wall of the recess 2512, thereby increasing the size of the electrode terminal connection area 2513, and thus improving the welding strength between it and the electrode terminal 22, thereby improving the reliability of the battery cell 20.

[0167] It should be understood that the adapter piece 25 in this embodiment may also have other shapes. Figure 16 This illustration shows a side view of an adapter piece 25 according to another embodiment of the present application. Figure 16 The adapter piece 25 shown is another possible implementation of the adapter piece 25 in this application embodiment. Figure 16 The side view shown illustrates the surface of the adapter 25 perpendicular to its width direction, where the width direction of the adapter 25 is the same as the width direction Y of the battery cell 20.

[0168] In some embodiments, such as Figure 16 As shown, the adapter 25 also includes a transition region 256. For example, the non-connection region 2516 may include the transition region 256. The transition region 256 is used to connect the electrode terminal connection region 2513 and the tab connection region 2514 of the adapter 25, so that the electrode terminal connection region 2513 and the tab connection region 2514 are located at different heights in the height direction Z of the battery cell 20. For example... Figure 16Taking the example where the electrode terminal connection area 2513 is closer to the interior of the battery cell 20 than the tab connection area 2514, the position of the electrode terminal connection area 2513 and the tab connection area 2514 in the height direction Z of the battery cell 20 can be adjusted by setting the transition area 256, so that the adapter piece 25 can be used in different application scenarios, facilitating the electrical connection between the electrode terminal 22 and the tab 242.

[0169] According to some embodiments of this application, this application also provides a battery device 10, including a battery cell 20 as described in any of the above embodiments.

[0170] According to some embodiments of this application, this application also provides an electrical device including the battery device 10 described in any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device.

[0171] The electrical equipment can be any of the aforementioned devices or systems that utilize battery devices.

[0172] According to some embodiments of this application, see Figures 3 to 14 This application provides a battery cell 20, including: a housing 21 having a cavity structure, the housing including a first wall 201, a plurality of first connectors 2121 disposed on the side of the first wall 201 facing the interior of the battery cell; electrode terminals 22 located in the mounting area 2122 of the first wall 201, the mounting area 2122 being the portion of the first wall 201 covered by the orthographic projection of the electrode terminals 22 on the surface of the first wall 201 facing the interior of the battery cell; wherein, on the surface of the first wall 201 facing the interior of the battery cell, the orthographic projections of the plurality of first connectors 2121 do not overlap with the orthographic projection of the mounting area 2122; and an insulating member 23 located on the side of the first wall 201 facing the interior of the battery cell. Multiple second connectors 231 are provided on the side of the insulating member 23 facing the first wall 201. The second connectors 231 cooperate with the first connectors 2121 to connect the first wall 201 and the insulating member 23. The electrode assembly 24 is housed in the cavity of the housing 21 and includes tabs 242. The adapter piece 25 is located on the side of the insulating member 23 facing the inside of the battery cell. The adapter piece 25 is used to electrically connect the electrode terminal 22 and the tabs 242. A portion of the adapter piece 25 is correspondingly disposed in the area between two adjacent first connectors 2121. The two first connectors 2121 are respectively located on both sides of the mounting area 2122 along the length direction of the first wall 201.

[0173] Along the length direction of the first wall 201, the first wall 201 includes a plurality of spaced-apart first connectors 2121; and / or, along the width direction of the first wall 201, the first wall 201 includes a plurality of spaced-apart first connectors 2121. The first connector 2121 is a groove, and the second connector 231 is a protrusion, at least a portion of the second connector 231 is accommodated within the first connector 2121; the first connector 2121 satisfies at least one of the following conditions: the first connector 2121 is riveted to the second connector 231, the minimum diameter of the first connector 2121 is in the range of [1 mm, 6 mm], and the ratio of the depth of the first connector 2121 to the thickness of the first wall 201 is in the range of [30%, 70%]. The first connector 2121 satisfies at least one of the following conditions: the minimum distance between the first connector 2121 and the edge of the mounting area 2122 is greater than or equal to 5 mm; the minimum distance between the first connector 2121 and the edge of the first wall 201 is greater than or equal to 4 mm along the length direction of the first wall 201; the minimum distance between the first connector 2121 and the edge of the first wall 201 is greater than or equal to 4 mm along the width direction of the first wall 201; and the distance between two adjacent first connectors 2121 is in the range of [10 mm, 35 mm]. The mounting area 2122 is a groove structure of the first wall 201 protruding towards the inside of the battery cell and having an opening away from the inside of the battery cell. The bottom wall of the mounting area 2122 is provided with an electrode lead-out hole 2123 so that the electrode terminal 22 is electrically connected to the adapter piece 25.

[0174] The adapter piece 25 includes a connected body portion 251 and a first protrusion 252. Along the width direction of the first wall 201, the first protrusion 252 protrudes from the body portion 251. A tab 242 and an electrode terminal 22 are connected to the body portion 251. The first protrusion 252 is correspondingly disposed in the area between two first connectors 2121. Along the width direction of the first wall 201, a first gap 2511 is formed between the body portion 251 and the outer shell 21. The first protrusion 252 is disposed within the first gap 2511, and at least a portion of the tab 242 is disposed within the first gap 2511. In a plane perpendicular to the thickness of the first wall 201, within the range of the orthographic projection of the first gap 2511, the orthographic projection of the first protrusion 252 does not overlap with the orthographic projection of the tab 242. In a plane perpendicular to the thickness of the first wall 201, within the range of the orthographic projection of the first gap 2511, the orthographic projection of at least one first connector 2121 is located within the range of the orthographic projection of the tab 242. Along the width direction of the first wall 201, first protrusions 252 are respectively provided on opposite sides of the main body 251, and first gaps 2511 are formed between the opposite sides of the main body 251 and the outer shell 21.

[0175] The adapter piece 25 also includes a second protrusion 253 connected to the body portion 251. The second protrusion 253 is disposed within the first gap 2511, and at least a portion of the electrode tab 242 is located between the first protrusion 252 and the second protrusion 253 along the length direction of the first wall 201. The body portion 251 includes a recess 2512, the opening of which faces the interior of the battery cell, and the recess 2512 protrudes toward the electrode terminal 22. The bottom wall of the recess 2512 includes an electrode terminal connection area 2513 for electrical connection with the electrode terminal 22.

[0176] 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 casing (21) has a cavity structure, and the outer casing (21) includes a first wall (201), and a plurality of first connectors (2121) are provided on the side of the first wall (201) facing the interior of the battery cell; Electrode terminals (22) are located in the mounting area (2122) of the first wall (201), the mounting area (2122) being the portion of the first wall (201) covered by the orthographic projection of the electrode terminals (22) on the surface of the first wall (201) facing the interior of the battery cell; wherein, on the surface of the first wall (201) facing the interior of the battery cell, the orthographic projections of the plurality of first connectors (2121) do not overlap with the orthographic projection of the mounting area (2122); An insulating member (23) is located on the side of the first wall (201) facing the interior of the battery cell. A plurality of second connectors (231) are provided on the side of the insulating member (23) facing the first wall (201). The second connectors (231) cooperate with the first connectors (2121) to connect the first wall (201) and the insulating member (23). An electrode assembly (24) is housed within the cavity of the housing (21), the electrode assembly (24) including tabs (242); The adapter piece (25) is located on the side of the insulating member (23) facing the inside of the battery cell. The adapter piece (25) is used to electrically connect the electrode terminal (22) and the tab (242). A portion of the adapter piece (25) is correspondingly disposed in the area between two adjacent first connectors (2121) among a plurality of first connectors (2121). The two first connectors (2121) are respectively located on both sides of the mounting area (2122) along the length direction of the first wall (201).

2. The battery cell according to claim 1, characterized in that, Along the length of the first wall (201), the first wall (201) includes a plurality of first connectors (2121) spaced apart; and / or, Along the width direction of the first wall (201), the first wall (201) includes a plurality of first connectors (2121) spaced apart.

3. The battery cell according to claim 1, characterized in that, The first connector (2121) is a groove, the second connector (231) is a protrusion, and at least a portion of the second connector (231) is accommodated within the first connector (2121); The first connector (2121) satisfies at least one of the following conditions: The first connector (2121) and the second connector (231) are riveted together, and the minimum diameter of the first connector (2121) is in the range of [1mm, 6mm]. The ratio of the depth of the first connector (2121) to the thickness of the first wall (201) ranges from [30%, 70%].

4. The battery cell according to claim 1, characterized in that, The first connector (2121) satisfies at least one of the following conditions: The minimum distance between the first connector (2121) and the edge of the mounting area (2122) is greater than or equal to 5 mm; Along the length of the first wall (201), the minimum distance between the first connector (2121) and the edge of the first wall (201) is greater than or equal to 4 mm; Along the width direction of the first wall (201), the minimum distance between the first connector (2121) and the edge of the first wall (201) is greater than or equal to 4 mm; The distance between two adjacent first connectors (2121) in the plurality of first connectors (2121) ranges from [10mm, 35mm].

5. The battery cell according to claim 1, characterized in that, The mounting area (2122) is a groove structure that protrudes from the first wall (201) toward the inside of the battery cell and has an opening away from the inside of the battery cell. The bottom wall of the mounting area (2122) is provided with an electrode lead-out hole (2123) so that the electrode terminal (22) is electrically connected to the adapter piece (25).

6. The battery cell according to any one of claims 1 to 5, characterized in that, The adapter piece (25) includes a connected body portion (251) and a first protrusion (252). Along the width direction of the first wall (201), the first protrusion (252) protrudes from the body portion (251). The tab (242) and the electrode terminal (22) are connected to the body portion (251). The first protrusion (252) is correspondingly disposed in the area between the two first connectors (2121).

7. The battery cell according to claim 6, characterized in that, Along the thickness direction of the first wall (201), the distance between the first protrusion (252) and the insulating member (23) ranges from 1 mm to 5 mm.

8. The battery cell according to claim 6, characterized in that, Along the width direction of the first wall (201), a first gap (2511) is formed between the body part (251) and the outer shell (21), the first protrusion (252) is disposed in the first gap (2511), and at least a portion of the tab (242) is disposed in the first gap (2511). Within the plane perpendicular to the thickness of the first wall (201), the orthographic projection of the first gap (2511) does not overlap with the orthographic projection of the tab (242) within the range of the orthographic projection of the first protrusion (252).

9. The battery cell according to claim 8, characterized in that, Within the plane perpendicular to the thickness of the first wall (201), the orthographic projection of at least one of the first connectors (2121) lies within the orthographic projection of the tab (242) within the range of the orthographic projection of the first gap (2511).

10. The battery cell according to claim 8, characterized in that, Along the width direction of the first wall (201), the first protrusion (252) is provided on the opposite sides of the body part (251), and the first gap (2511) is formed between the opposite sides of the body part (251) and the outer shell (21).

11. The battery cell according to claim 8, characterized in that, The adapter piece (25) further includes a second protrusion (253) connected to the main body (251), the second protrusion (253) being disposed within the first gap (2511). Along the length of the first wall (201), at least a portion of the tabs are located between the first protrusion (252) and the second protrusion (253).

12. The battery cell according to claim 6, characterized in that, The body portion (251) includes a recess (2512), the opening of which faces the interior of the battery cell, and the recess (2512) protrudes toward the electrode terminal (22); The bottom wall of the recess (2512) includes an electrode terminal connection area (2513) for electrical connection with the electrode terminal (22).

13. The battery cell according to claim 12, characterized in that, The recess (2512) satisfies: The ratio of the thickness of the sidewall of the recess (2512) to the thickness of the area of ​​the body portion (251) excluding the recess (2512) is greater than or equal to 4 / 5; and / or, The angle between the bottom wall and the side wall of the recess (2512) ranges from [91°, 130°].

14. The battery cell according to claim 6, characterized in that, The main body (251) includes a connection area (2515) and a non-connection area (2516). The connection area (2515) includes an electrode terminal connection area (2513) and a tab connection area (2514). The electrode terminal connection area (2513) is used to electrically connect with the electrode terminal (22), and the tab connection area (2514) is used to electrically connect with the tab (242). The thickness of the connecting area (2515) is T6, the thickness of the non-connecting area (2516) is T5, and the value range of (T5-T6) / T5 is [5%, 65%.

15. The battery cell according to any one of claims 1 to 5, characterized in that, The outer casing (21) includes: The shell (211) has a cavity structure with an opening (2111); A cover plate (212) is used to cover the opening (2111), the cover plate (212) being the first wall (201).

16. A battery device, characterized in that, include: Multiple battery cells, wherein the battery cells are battery cells as described in any one of claims 1 to 15.

17. An electrical appliance, characterized in that, include: A battery device comprising a battery cell as described in any one of claims 1 to 15, the battery device being used to supply power to the electrical device.

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