Battery cell, battery, energy storage device, and electric device

Abstract

A battery cell (10), a battery (100), an energy storage device (2000), and an electric device. The battery cell (10) comprises a casing (11), a first conductive member (120), and a first terminal post (121). The casing (11) has a first wall (111). The first conductive member (120) is arranged on the first wall (111) and is insulated from the first wall (111). The first terminal post (121) is electrically connected to the first conductive member (120). The first conductive member (120) comprises a first connecting portion (122) and a second connecting portion (123) connected to each other; and in a direction facing away from the interior of the battery cell (10), the first connecting portion (122) protrudes from the second connecting portion (123), and the first connecting portion (122) is configured to be connected to a bus component. The technical solution can effectively improve the volumetric energy density of batteries.

Description

Battery cells, batteries, energy storage devices and electrical appliances Cross-references to related applications

[0001] This application claims priority to Chinese patent application 202410708947.1, filed on May 31, 2024, entitled “Battery cell, battery, energy storage device and power consumption device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, an energy storage device, and an electrical device. Background Technology

[0003] 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.

[0004] In the development of battery technology, how to improve the energy density of batteries is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] This application provides a battery cell, a battery, an energy storage device, and an electrical device. The technical solution provided by this application can effectively improve the volumetric energy density of the battery.

[0006] In a first aspect, this application provides a battery cell. The battery cell includes a casing, a first conductive element, and a first terminal. The casing has a first wall. The first conductive element is disposed on the outer side of the first wall and is insulated from the first wall. The first terminal is electrically connected to the first conductive element. The first conductive element includes a first connecting portion and a second connecting portion connected to each other. Along a direction away from the interior of the battery cell, the first connecting portion protrudes from the second connecting portion, and the first connecting portion is used for connection to a busbar component.

[0007] In the above solution, by setting the first connecting portion for connection with the busbar component to protrude from the second connecting portion, and the second connecting portion to be recessed relative to the first connecting portion, a clearance portion for avoiding other structural components can be formed between the first and second connecting portions. For example, in a battery, the clearance portion can avoid structural components such as wiring harnesses and circuit boards, improving the space utilization rate of the battery's structural components, making the battery structure compact, and facilitating the improvement of the battery's volumetric energy density.

[0008] According to some embodiments of this application, the first conductive element is disposed on the outer side of the first wall.

[0009] In the above solution, by placing the first conductive component entirely on the outside of the first wall, the difficulty of assembling the first conductive component on the first wall can be reduced, and the manufacturing efficiency of the battery cell can be improved.

[0010] According to some embodiments of this application, the battery cell further includes a first deformable member electrically connected to a first wall, the first deformable member being configured to deform to contact a first conductive member to electrically connect a first terminal post to the first wall.

[0011] In the above scheme, by setting a first deformable component, when the battery cell is under abuse conditions such as overcharging, the pressure change inside the battery cell causes the first deformable component to deform, effectively connecting the first electrode post to the first wall. This effectively achieves a short circuit between the positive and negative electrodes inside the battery cell, causing the electrical connection components inside the battery cell to melt due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell. This provides overcharge protection, reduces the risk of thermal runaway of the battery cell, and ultimately makes the battery more reliable.

[0012] According to some embodiments of this application, along the thickness direction of the first wall, the projection of the first connecting portion at least partially overlaps with the projection of the first deformable member. The second connecting portion is connected to the first pole post.

[0013] In the above solution, by misaligning the first deformable part and the first electrode post, so that the first deformable part corresponds to the first connecting part and the first electrode post corresponds to the second connecting part, the risk of mis-contact between the first deformable part and the first electrode post, which could lead to a short circuit inside the battery cell and affect the reliability of the battery, can be effectively reduced, thereby making the battery highly reliable.

[0014] According to some embodiments of this application, along the thickness direction of the first wall, the projection of the second connecting portion at least partially overlaps with the projection of the first deformable member. The first connecting portion is connected to the first pole post.

[0015] In the above solution, by misaligning the first deformable part and the first electrode post, so that the first deformable part corresponds to the second connecting part and the first electrode post corresponds to the first connecting part, the risk of mis-contact between the first deformable part and the first electrode post, which could lead to a short circuit inside the battery cell and affect the reliability of the battery, can be effectively reduced, thereby making the battery highly reliable.

[0016] According to some embodiments of this application, the outer side of the first wall is provided with a first groove recessed into the battery cell, and at least a portion of the second connection portion is accommodated in the first groove.

[0017] In the above solution, by providing a first groove on the outer side of the first wall, at least a portion of the second connecting part can be accommodated, so that at least a portion of the first conductive part sinks below the outer side of the first wall, which can effectively reduce the space occupied by the battery cell in the thickness direction of the first wall, thereby enabling a reasonable layout of the battery's structural components and effectively improving the volumetric energy density of the battery.

[0018] According to some embodiments of this application, one of the following conditions is met:

[0019] (1) Along the direction away from the inside of the battery cell, the first electrode post protrudes from the outer side of the first wall, and the height of the protrusion is no more than 0.5mm;

[0020] (2) Along the direction away from the inside of the battery cell, the first electrode post does not protrude from the outer side of the first wall.

[0021] (3) The outer side of the first pole relative to the first wall is recessed into the battery cell, and the depth of the recess is no more than 1 mm.

[0022] In the above scheme, (1) by setting the height of the first electrode post protruding from the outer side of the first wall to no more than 0.5mm, on the one hand, the overall size of the battery cell can be effectively reduced, and the space utilization rate can be improved, which is conducive to the improvement of the battery volumetric energy density; on the other hand, the occupation of the first electrode post on the external space can be reduced, so that the battery structural components can be effectively arranged between the first connection part and the second connection part, making the battery structure compact and the space utilization rate high, thereby improving the battery volumetric energy density; (2) by setting the first electrode post to not protrude from the outer side of the first wall, the space occupied by the first electrode post can be effectively saved, so that the battery structural components can be effectively arranged between the first connection part and the second connection part. This makes the battery structure compact and space utilization high, thereby improving the volumetric energy density of the battery; (3) By setting the depth of the first pole recessed into the outer side of the first wall to no more than 1mm, on the one hand, it can effectively reduce the overall size of the battery cell, improve the space utilization, reduce the occupation of the first pole in the external space, so that the battery structural components can be effectively arranged between the first connection part and the second connection part, making the battery structure compact and space utilization high, thereby improving the volumetric energy density of the battery; on the other hand, it can reduce the impact on the internal space of the battery cell caused by sinking the first pole, thereby ensuring the volumetric energy density of the battery cell to a certain extent, thereby making the volumetric energy density of the battery high.

[0023] According to some embodiments of this application, the battery cell further includes a first insulating member, at least a portion of which is disposed between the first wall and the first conductive member.

[0024] In the above solution, by setting a first insulating component, the first conductive component and the first wall can be effectively insulated and isolated, thereby reducing the risk of internal short circuit in the battery cell caused by the first conductive component and the first wall overlapping, and thus improving the reliability of the battery.

[0025] According to some embodiments of this application, the first insulating element and the first conductive element are integrally injection molded.

[0026] In the above scheme, the first insulating component and the first conductive component are integrally injection molded. On the one hand, this can save the time of assembling the first insulating component and the first conductive component separately on the first wall, improve the manufacturing efficiency of the battery cell, and thus improve the manufacturing efficiency of the battery. On the other hand, it can enable the first insulating component to effectively insulate and isolate the first wall and the first conductive component, thereby reducing the risk of internal short circuit in the battery cell caused by the first conductive component overlapping with the first wall, and thus improving the reliability of the battery.

[0027] According to some embodiments of this application, the first insulating member includes a bottom wall and a side wall, the bottom wall is disposed between the first wall and the first conductive member, the side wall surrounds the bottom wall, and the first conductive member is located within the accommodating space formed by the side wall and the bottom wall.

[0028] In the above scheme, by setting the bottom wall and side wall, the first wall and the first conductive component can be effectively insulated and isolated, and the creepage distance between the first wall and the first conductive component can be increased, thereby reducing the risk of internal short circuit of the battery cell caused by the first conductive component overlapping with the first wall, and thus improving the reliability of the battery.

[0029] According to some embodiments of this application, a first clearance hole and a second clearance hole are formed on the bottom wall. The first clearance hole allows the first deformable member to pass through, and the second clearance hole allows the first pole post to pass through.

[0030] In the above scheme, by providing a first clearance hole, the first deformable part can pass through the first insulating part and contact the first conductive part during deformation, thereby achieving overcharge protection. By providing a second clearance hole, the risk of mutual interference between the first electrode post and the first insulating part can be reduced, the efficiency of assembling the first electrode post into the first conductive part can be improved, and thus the manufacturing efficiency of the battery cell can be improved.

[0031] According to some embodiments of this application, a first protrusion is formed on the side of the bottom wall facing the first wall along the thickness direction of the first wall, and the first protrusion is arranged around the first pole post.

[0032] In the above solution, by providing a first protrusion on the inner side of the bottom wall and surrounding the first electrode post, the insulation effect between the first electrode post and the first wall can be effectively improved, thereby improving the reliability of the battery cell and thus the reliability of the battery.

[0033] According to some embodiments of this application, the bottom wall includes a first sub-bottom wall and a second sub-bottom wall. The first sub-bottom wall is disposed between the first connecting portion and the first wall, and the second sub-bottom wall is disposed between the second connecting portion and the first wall. The first sub-bottom wall protrudes from the second sub-bottom wall in a direction away from the interior of the battery cell.

[0034] In the above scheme, by making the first sub-bottom wall protrude from the second sub-bottom wall, the outer contour shape of the first insulating member corresponds to the first conductive member, thereby reducing the space occupied by the first insulating member in the thickness direction of the first wall, making the battery cell structure compact, which is conducive to improving the volumetric energy density, and thus making the battery volumetric energy density high.

[0035] According to some embodiments of this application, the first conductive element further includes a third connecting portion, which connects the first connecting portion and the second connecting portion. The bottom wall further includes a third sub-bottom wall, which is disposed between the third connecting portion and the first wall, and connects the first sub-bottom wall and the second sub-bottom wall.

[0036] In the above solution, by setting a third connecting part, a smooth transition can be achieved between the first and second connecting parts, reducing the molding difficulty of the first conductive component. This also effectively creates a clearance between the first and second connecting parts, avoiding structural components such as wiring harnesses and circuit boards, thus improving the space utilization of the battery's structural components and resulting in a more compact battery structure, which is beneficial for increasing the battery's volumetric energy density. Simultaneously, the third sub-bottom wall can be effectively positioned between the third connecting part and the first wall, providing insulation and reducing the risk of internal short circuits in the battery cell caused by the first conductive component overlapping with the first wall, thereby improving battery reliability.

[0037] According to some embodiments of this application, the first insulating member further includes a reinforcing portion, the two ends of which are connected to the sidewall, and an opening is formed between the reinforcing portion and the third sub-bottom wall for the third connecting portion to pass through.

[0038] In the above scheme, by setting up a reinforcing part, the structural strength of the first insulating member can be improved, so that the first insulating member is stably positioned between the first conductive member and the first wall, effectively playing the role of insulation and isolation, thereby reducing the risk of internal short circuit of the battery cell caused by the first conductive member overlapping with the first wall, and thus improving the reliability of the battery.

[0039] According to some embodiments of this application, the battery cell further includes a second conductive element and a second terminal. The second conductive element is disposed on the outer side of the first wall and is insulated from the first wall. The second terminal is electrically connected to the second conductive element, and the polarity of the second terminal is opposite to that of the first terminal. The second conductive element includes a fourth connecting portion and a fifth connecting portion connected to each other. Along a direction away from the interior of the battery cell, the fourth connecting portion protrudes from the fifth connecting portion, and the fourth connecting portion is used for connection with a busbar component.

[0040] In the above solution, by setting the fourth connection part for connecting with the busbar component to protrude from the fifth connection part, that is, the fifth connection part is recessed relative to the fourth connection part, a clearance part can be formed between the fourth connection part and the fifth connection part, thereby avoiding structural components such as wire harnesses and circuit boards, improving the space utilization rate of the battery's structural components, making the battery structure compact, and facilitating the improvement of the battery's volumetric energy density.

[0041] According to some embodiments of this application, the first conductive element and the second conductive element are arranged along a first direction, and along the first direction, the second connecting portion and the fifth connecting portion are located between the first connecting portion and the fourth connecting portion.

[0042] In the above scheme, the first conductive component and the second conductive component are arranged along the first direction. By setting the respective sunken second connecting part and fifth connecting part as the inner side, a large-sized avoidance part can be formed above the first wall, thereby effectively avoiding structural components such as wire harnesses and circuit boards, improving the space utilization rate of the battery's structural components, making the battery structure compact, and facilitating the improvement of the battery's volumetric energy density.

[0043] According to some embodiments of this application, along the first direction, the maximum distance between the second connecting portion and the fifth connecting portion is L, and the maximum dimension of the first wall is M, satisfying 1.5≤M / L≤3.5.

[0044] According to some embodiments of this application, the battery cell further includes a second deformable member electrically connected to the first wall. The second deformable member is configured to deform to contact a second conductive member to electrically connect the second terminal post to the first wall.

[0045] In the above scheme, by setting a second deformable component, when the internal pressure of the battery cell reaches a certain level, the deformation of the second deformable component causes the second electrode to be electrically connected to the first wall. This allows the electrical connection components inside the battery cell to melt due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell. This provides overcharge protection and reduces the risk of thermal runaway of the battery cell, thus making the battery more reliable.

[0046] According to some embodiments of this application, along the thickness direction of the first wall, the projection of the fourth connecting portion at least partially overlaps with the projection of the second deformable member. The fifth connecting portion is connected to the second pole post.

[0047] In the above solution, by misaligning the second deformable part and the second electrode post, so that the second deformable part corresponds to the fourth connecting part and the second electrode post corresponds to the fifth connecting part, the risk of mis-contact between the second deformable part and the second electrode post, which could lead to a short circuit inside the battery cell and affect the reliability of the battery, can be effectively reduced, thereby making the battery highly reliable.

[0048] According to some embodiments of this application, along the thickness direction of the first wall, the projection of the fifth connecting portion at least partially overlaps with the projection of the second deformable member. The fourth connecting portion is connected to the second pole post.

[0049] In the above solution, by misaligning the second deformable part and the second electrode post, so that the second deformable part corresponds to the fifth connecting part and the second electrode post corresponds to the fourth connecting part, the risk of mis-contact between the second deformable part and the second electrode post, which could lead to a short circuit inside the battery cell and affect the reliability of the battery, can be effectively reduced, thereby making the battery highly reliable.

[0050] Secondly, some embodiments of this application also provide a battery, which includes the battery cell provided in the first aspect.

[0051] Thirdly, some embodiments of this application also provide an energy storage device, which includes the battery cell provided in the first aspect.

[0052] Fourthly, some embodiments of this application also provide an electrical device, which includes the battery cell provided in the first aspect, the battery cell being used to provide electrical energy.

[0053] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0054] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 is a schematic diagram of the vehicle in some embodiments of this application;

[0056] Figure 2 is a schematic diagram of an energy storage device in some embodiments of this application;

[0057] Figure 3 is an exploded perspective view of the battery in some embodiments of this application;

[0058] Figure 4 is an exploded perspective view of a battery cell in some embodiments of this application;

[0059] Figure 5 is a schematic diagram of the end cap and electrode terminals in some embodiments of this application;

[0060] Figure 6 is a schematic diagram of the internal structure of the first wall and the electrode terminals in some embodiments of this application;

[0061] Figure 7 is a partial structural schematic diagram of a battery cell in some embodiments of this application;

[0062] Figure 8 is a schematic diagram of the flip-over sheet in some embodiments of this application;

[0063] Figure 9 is a schematic diagram of the first wall in some embodiments of this application;

[0064] Figure 10 is a schematic diagram of the first conductive element in some embodiments of this application;

[0065] Figure 11 is a schematic diagram of the first conductive element and the first insulating element in some embodiments of this application;

[0066] Figure 12 is a schematic diagram of the first insulating element in some embodiments of this application;

[0067] Figure 13 is a schematic diagram of the first wall, the second conductive element, and the second pole in some embodiments of this application;

[0068] Figure 14 is a schematic diagram of the first wall in some embodiments of this application.

[0069] Icons: 10-Battery cell; 11-Casing; 110-Shell; 111-First wall; 1100-First groove; 1111-Second groove; 1112-First through hole; 1113-Second through hole; 12-First electrode terminal; 120-First conductive element; 121-First terminal post; 122-First connecting part; 123-Second connecting part; 124-Third connecting part; 13-First deformable element; 14-Second electrode terminal; 140-Second conductive element; 141-Second terminal post; 142-Fourth connecting part; 143-Fifth connecting part; 144-Sixth connecting part; 15-Second deformable element; 16-First insulating element; 160-Bottom wall; 161-Side wall ; 162-First sub-bottom wall; 163-Second sub-bottom wall; 164-Third sub-bottom wall; 165-Reinforcing part; 166-First clearance hole; 167-Second clearance hole; 168-First protrusion; 17-Second insulating part; 18-Flip piece; 180-Skirt; 181-Flip foil; 182-Electrical connection part; 19-Third insulating part; 20-Electrode assembly; 21-First electrode tab; 22-Second electrode tab; z-Thickness direction of the first wall; x-First direction; 30-Box body; 31-First box body part; 32-Second box body part; 1000-Vehicle; 200-Controller; 300-Motor; 100-Battery; 2000-Energy storage device; 2001-Cabinet body. Detailed Implementation

[0070] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0072] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0073] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments 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 three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0075] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0076] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0077] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0078] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cuboid or other shapes, etc., and the embodiments of this application are not limited thereto. The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery generally includes a casing for encapsulating one or more battery cells. The casing can, to a certain extent, prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0079] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement (e.g., insertion / extraction) of metal ions between the positive and negative electrodes. The positive electrode 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 uncoated positive current collector protrudes from the coated positive current collector and serves as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The uncoated negative current collector protrudes from the coated negative current collector and serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. 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. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of this application are not limited to these.

[0080] The battery cell also includes a casing, an electrode assembly, and an electrolyte disposed inside the casing. The casing has a first wall with electrode terminals disposed thereon. The electrode terminals are connected to the electrode assembly and are used for the input and output of electrical energy.

[0081] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, and charge / discharge rate.

[0082] Currently, a single battery cell includes a casing and electrode terminals disposed on the wall of the casing. The electrode terminals include interconnected conductive elements and terminals. The conductive elements are located on the outer side of the wall for connection to a busbar component, and at least a portion of the terminals are located inside the casing for connection to the tabs of the electrode assembly. The conductive elements protrude from the wall of the casing. At the battery level, these protruding conductive elements occupy space from external structural components, such as wiring harnesses and flexible circuit boards, thus affecting the battery's volumetric energy density.

[0083] Specifically, to reduce the risk of thermal runaway in battery cells under abusive conditions such as overcharging, some battery cells are currently equipped with overcharge protection structures. For example, the overcharge protection structure includes a deformable component electrically connected to the casing. Under abusive conditions such as overcharging, when the internal pressure of the battery cell increases to a certain extent, the deformable component deforms under the internal pressure, contacting the conductive component. This short-circuits the casing with the electrode terminals, short-circuiting the positive and negative terminals of the battery cell, causing an internal short circuit. The electrical connection components inside the battery cell melt due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell and providing overcharge protection. Generally, the planar dimensions of the conductive component are designed to be relatively large to accommodate both the connection with the terminals and the contact with the deformable component. However, a larger conductive component further occupies space in the external structural components, further affecting the volumetric energy density of the battery.

[0084] In view of this, to improve the reduction in battery volumetric energy density caused by the occupation of external space by conductive components, some embodiments of this application provide a battery cell. The battery cell includes a casing, a first conductive component, and a first terminal. The casing has a first wall. The first conductive component is disposed on the first wall and is insulated from the first wall. The first terminal is electrically connected to the first conductive component. The first conductive component includes a first connecting portion and a second connecting portion connected to each other. Along a direction away from the interior of the battery cell, the first connecting portion protrudes from the second connecting portion, and the first connecting portion is used to connect to a busbar component.

[0085] In the above solution, by setting the first connecting portion for connection with the busbar component to protrude from the second connecting portion, and the second connecting portion to be recessed relative to the first connecting portion, a clearance portion can be formed between the first connecting portion and the second connecting portion. In the battery, the clearance portion can avoid structural components such as wiring harnesses and circuit boards, improving the space utilization rate of the battery's structural components, thereby making the battery structure compact and facilitating the improvement of the battery's volumetric energy density.

[0086] The technical solutions described in the embodiments of this application are applicable to batteries, energy storage devices using batteries, and electrical devices using batteries.

[0087] The technical solutions described in some embodiments of this application are applicable to batteries with deformable parts, as well as batteries without deformable parts.

[0088] Energy storage devices may include energy storage containers, energy storage cabinets, etc. For example, an energy storage cabinet may include a cabinet and one or more batteries mounted on the cabinet.

[0089] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; 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. The electrical devices in the embodiments of this application include, but are not limited to, those mentioned above.

[0090] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0091] Figure 1 is a schematic diagram of a vehicle in some embodiments of this application.

[0092] The vehicle 1000 may house a controller 200, a motor 300, and a battery 100. The controller 200 controls the battery 100 to supply power to the motor 300. For example, the battery 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, it can serve as the vehicle 1000's operating power source, supplying power to the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery 100 can not only serve as the vehicle 1000's operating power source but also as its driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0093] Please refer to Figure 2, which is a schematic diagram of an energy storage device 2000 in some embodiments of this application.

[0094] The energy storage device 2000 may include a cabinet 2001 and multiple batteries 100. The multiple batteries 100 may be housed within the cabinet 2001. The multiple batteries 100 may be connected in series, in parallel, or in a mixed configuration.

[0095] Please refer to Figure 3, which is an exploded perspective view of the battery 100 in some embodiments of this application.

[0096] The battery 100 includes a battery cell 10 and a housing 30, with the battery cell 10 housed within the housing 30. The housing 30 provides a space for the battery cell 10 and can have various structures. In some embodiments, the housing 30 may include a first housing portion 31 and a second housing portion 32, which overlap each other, collectively defining a space for accommodating the battery cell 10. The second housing portion 32 may be a hollow structure with one open end, while the first housing portion 31 may be a plate-like structure, covering the open side of the second housing portion 32 so that the first housing portion 31 and the second housing portion 32 together define the accommodating space. Alternatively, both the first housing portion 31 and the second housing portion 32 may be hollow structures with one open side, with the open side of the first housing portion 31 overlapping the open side of the second housing portion 32. Of course, the box 30 formed by the first box part 31 and the second box part 32 can be of various shapes, such as cylinder, cuboid, etc.

[0097] In the battery 100, there can be one or more battery cells 10, and each battery cell 10 can be fixed to the housing 30 by means of connectors (such as bolts), or each battery cell 10 can be fixed to the housing 30 by means of adhesive bonding.

[0098] This application provides a battery cell 10 in some embodiments. Please refer to Figures 4-7. Figure 4 is an exploded perspective view of the battery cell 10 in some embodiments of this application. Figure 5 is a schematic diagram of the end cap and electrode terminals in some embodiments of this application. Figure 6 is a schematic diagram of the internal structure of the first wall 111 and electrode terminals in some embodiments of this application. Figure 7 is a partial structural schematic diagram of the battery cell 10 in some embodiments of this application.

[0099] The battery cell 10 includes a housing 11, a first conductive element 120, and a first terminal 121. The housing 11 has a first wall 111. The first conductive element 120 is disposed on the first wall 111 and is insulated from the first wall 111. The first terminal 121 is electrically connected to the first conductive element 120. The first conductive element 120 includes a first connecting portion 122 and a second connecting portion 123 that are interconnected. Along a direction away from the interior of the battery cell 10, the first connecting portion 122 protrudes from the second connecting portion 123, and the first connecting portion 122 is used to connect to a busbar component.

[0100] The housing 11 is a component for accommodating the electrode assembly 20. The housing 11 can also accommodate an electrolyte, such as an electrolyte solution. Referring to Figure 4, in some embodiments, the housing 11 includes a shell 110 and an end cap. The shell 110 has an internal cavity for accommodating the electrode assembly 20. The shell 110 has an opening communicating with the cavity. The end cap closes to the opening of the shell 110, forming a sealed connection to create a sealed space for accommodating the electrode assembly 20 and the electrolyte solution. The end cap can be connected to the shell 110 by welding, bonding, snap-fitting, or other connection methods. Optionally, the housing 11 may also include a base plate. Openings are formed at both ends of the shell 110, one of which is closed by the end cap, and the other opening is closed by the base plate.

[0101] In some embodiments, the housing 11 may be a sealed structure or a non-sealed structure.

[0102] As an example, when the outer casing 11 is a non-sealed structure, it only serves to protect the electrode assembly. The battery cell 10 includes a sealant for encapsulating the electrode assembly and electrolyte components. The outer casing 11 is disposed outside the sealant to protect the electrode assembly or to limit the expansion of the electrode assembly. Specifically, the sealant can be a bag-shaped insulating material or an aluminum-plastic film, covering the outside of the electrode assembly 20 and serving to insulate the electrode assembly 20 and the outer casing 11.

[0103] In some embodiments, the material of the housing 11 can be metal or a combination of metal and non-metal. For example, the housing 11 can be made of metal, such as aluminum, copper, iron, steel or aluminum alloy. Alternatively, some parts of the housing 11 can be made of metal, while the rest can be made of non-metal. For example, the end cap of the housing 11 can be made of metal, while the shell 110 or other parts of the housing 11 can be made of non-metallic materials.

[0104] The outer shell 11 can be of various shapes, such as a cylinder or a prism. The shape of the outer shell 11 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cylindrical structure, then a cylindrical outer shell 11 can be selected. If the electrode assembly 20 is a flat structure, then the outer shell 11 can be square.

[0105] Electrode terminals may be provided on the outer casing 11. One end of the electrode terminal can be connected to the tab of the electrode assembly 20, and the other end of the electrode terminal can be connected to an external busbar. At the battery level, battery cells 10 are electrically connected to each other through busbars, for example, battery cells 10 can be connected in series, parallel, or mixed through busbars. In some embodiments, the busbar is a plate made of a metal material, such as aluminum.

[0106] The first wall 111 is a part of the outer casing 11. The first wall 111 can be used to support the electrode terminals, so that the electrode terminals are in a stable state to realize the input and output of electrical energy. In some embodiments, the first wall 111 can be a part of the casing 110, such as the side wall or bottom wall of the casing 110. In some embodiments, the first wall 111 can be an end cap.

[0107] Electrode terminals are used for electrical connection with electrode assembly 20, allowing current to flow into or out of the electrode tab. In some embodiments, the electrode terminals are made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal. In some embodiments, the electrode terminals can be connected to the first electrode tab 21 via a first adapter. Exemplarily, the electrode tab of electrode assembly 20 is composed of multiple stacked sub-tabs, and one end of the adapter can be welded to the electrode tab, and then the other end of the adapter can be welded to the electrode terminal.

[0108] In some embodiments, the electrode terminals may include conductive elements and electrode posts, which may be directly or indirectly connected. At least a portion of the electrode post may be located inside the first wall 111 for electrical connection with the tabs of the electrode assembly 20, and the conductive element may be disposed on the outside of the first wall 111 for connection with an external busbar. In some embodiments, the connection between the conductive element and the electrode post includes, but is not limited to, welding, riveting, threaded connection, or integral molding.

[0109] Referring to Figures 5 and 7, in some embodiments of this application, the first wall 111 is provided with a first electrode terminal 12, which can be a negative electrode terminal or a positive electrode terminal.

[0110] The first electrode terminal 12 includes a first conductive element 120 and a first terminal post 121. The first conductive element 120 is disposed on the first wall 111 and is insulated from the first wall 111.

[0111] In some embodiments, the first conductive element 120 may be entirely located on the outer side of the first wall 111. In other embodiments, the first conductive element 120 may be partially located on the outer side of the first wall 111, and a portion of the first conductive element 120 may be located on the inner side of the first wall 111.

[0112] In some embodiments, an insulating structure is provided between the first conductive element 120 and the first wall 111. The insulating structure can be made of plastic or other materials with insulating properties. At least a portion of the first electrode post 121 is located on the inner wall of the first wall 111 to connect with the tab of the electrode assembly 20. In some embodiments, the first electrode post 121 is directly connected to the first tab 21 of the corresponding polarity. In other embodiments, the first electrode post 121 is connected to the first tab 21 via a first adapter. The first adapter can be made of a metal, such as aluminum, copper, iron, aluminum, steel, alloy, or composite metal. In some embodiments, one end of the first adapter can be welded to the first tab, and the other end can be welded to the first electrode post 121. In some embodiments, the materials of the first conductive element 120 and the first electrode post 121 can be metals, such as aluminum, copper, iron, aluminum, steel, alloy, or composite metal. The materials of the first conductive element 120 and the first electrode post 121 can be the same or different. For example, the first conductive element 120 can be made of aluminum, and the first electrode post 121 can be made of copper.

[0113] Referring to Figures 4-7, the first conductive element 120 includes a first connecting portion 122 and a second connecting portion 123 that are interconnected. Along a direction away from the interior of the battery cell 10, i.e., along the inner side of the first wall 111 towards the outer side of the first wall 111, the first connecting portion 122 protrudes from the second connecting portion 123, forming a clearance between them. This direction away from the interior of the battery cell 10 can be parallel to the thickness direction z of the first wall.

[0114] For example, the first conductive element 120 is generally plate-shaped, with a first connecting portion 122 and a second connecting portion 123 arranged along its length. The first connecting portion 122 can protrude entirely from the second connecting portion 123, that is, the second connecting portion 123 is generally recessed from the first connecting portion 122. The area formed by the recess of the second connecting portion 123 can serve as a clearance portion. At the battery level, the clearance portion can accommodate wiring harnesses, circuit boards, or other structural components in the battery to achieve clearance for wiring harnesses, circuit boards, or other structural components.

[0115] In some embodiments, a relatively protruding first connecting portion 122 and a recessed second connecting portion 123 can be formed by processes such as bending, stamping, or integral casting, thereby forming a clearance portion between the first connecting portion 122 and the second connecting portion 123. Alternatively, the thickness of a portion of the first conductive element 120 can be adjusted to form a thinner second connecting portion 123 and a thicker first connecting portion 122.

[0116] In some embodiments, the thickness of the first connecting portion 122 and the thickness of the second connecting portion 123 may be equal or unequal.

[0117] In some embodiments, the second connecting portion 123, which is recessed relative to the first connecting portion 122, can be connected to the first pole post 121. For example, the second connecting portion 123 can be riveted to the first pole post 121.

[0118] In the above solution, by configuring the first connecting portion 122 for connection with the busbar component to protrude from the second connecting portion 123, that is, the second connecting portion 123 is recessed relative to the first connecting portion 122, a clearance portion can be formed between the first connecting portion 122 and the second connecting portion 123. In the battery, the clearance portion can avoid structural components such as wiring harnesses and circuit boards, improving the space utilization rate of the battery's structural components, making the battery structure compact, and facilitating the improvement of the battery's volumetric energy density.

[0119] According to some embodiments of this application, the first conductive element 120 is disposed on the outer side of the first wall 111.

[0120] In some embodiments, the first conductive element 120 may be located entirely outside the first wall 111, that is, in the direction from the outside of the first wall 111 to the inside, and the first conductive element 120 will not pass through the first wall 111.

[0121] In the above solution, by placing the first conductive element 120 on the outside of the first wall 111, the difficulty of assembling the first conductive element 120 on the first wall 111 can be reduced, and the manufacturing efficiency of the battery cell 10 can be improved.

[0122] According to some embodiments of this application, please refer to FIG8, which is a schematic diagram of the flip-over piece 18 in some embodiments of this application. The battery cell 10 also includes a first deformable member 13, which is electrically connected to the first wall 111. The first deformable member 13 is configured to deform to contact the first conductive member 120 to electrically connect the first terminal post 121 to the first wall 111.

[0123] The first deformable member 13 is mounted on the first wall 111 and is electrically connected to the first wall 111. In some embodiments, the first deformable member 13 may be made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal. In some embodiments, the first deformable member 13 may be welded to the inner surface of the first wall 111.

[0124] The first deformable member 13 is a structural component that deforms under the internal pressure of the battery cell 10. The first deformable member 13 can be used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is under overcharge or other abuse conditions, the internal pressure increases. When the internal pressure reaches a first threshold, the first deformable member 13 deforms to contact the first conductive member 120, thereby connecting the first wall 111 and the first electrode terminal 12, short-circuiting the positive and negative electrodes inside the battery cell 10. In some embodiments, the first wall 111 has a through hole, and the first deformable member 13 can close the through hole. When the first deformable member 13 deforms, the deformed portion of the first deformable member 13 can pass through the through hole and contact the first conductive member 120.

[0125] In some embodiments, the portion of the first deformable member 13 that contacts the first conductive member 120 may be the first connecting portion 122, or the portion of the first deformable member 13 that contacts the first conductive member 120 may be the second connecting portion 123, or the portion of the first deformable member 13 that contacts the first conductive member 120 may include the first connecting portion 122 and the second connecting portion 123.

[0126] In some embodiments, referring to FIG8, the first deformable member 13 can be a flip-over piece 18, which flips under pressure. The outer contour of the flip-over piece 18 is disc-shaped, and includes a skirt 180, a flip foil 181, and an electrical connection portion 182 connected sequentially from the outside to the inside. The skirt 180 can be connected to the first wall 111. The flip foil 181 is relatively thin and is used to deform and flip under pressure. After the flip foil 181 of the first deformable member 13 flips, it can push the electrical connection portion 182 toward the first conductive member 120, thereby making the electrical connection portion 182 contact the first conductive member 120.

[0127] In some embodiments, the first electrode terminal 12 is electrically connected to the first tab 21 via a first adapter. The second tab 22 of the electrode assembly 20 can be electrically connected to the housing 11. The second tab has the opposite polarity to the first tab 21. For example, the second tab 22 is directly or via a second adapter connected to the housing 11, or a second electrode terminal 14 is provided on the housing 11, the second electrode terminal 14 is electrically connected to the housing 11, and the second tab 22 is directly or via a second adapter connected to the second electrode terminal 14. When the internal pressure of the battery cell 10 reaches a first threshold, the first deformable member 13 deforms, short-circuiting the first electrode terminal 12 and the housing 11, thereby short-circuiting the positive and negative electrodes inside the battery cell 10 to form an internal short circuit. The instantaneously generated large current can melt the electrical connection components inside the battery cell 10, cutting off the charging and discharging circuit of the battery cell 10, thereby playing the role of overcharge protection.

[0128] In other embodiments, the first electrode terminal 12 is electrically connected to the first tab 21 via a first adapter. The second tab 22 of the electrode assembly 20 can be electrically connected to the second electrode terminal 14. The second tab 22 has the opposite polarity to the first tab 21. The second electrode terminal 14 can be insulated and mounted on the housing 11, for example, insulated and mounted on the first wall 111. The second tab 22 can be electrically connected to the second electrode terminal 14 via a second adapter. The second electrode terminal 14 is correspondingly provided with a second deformable member 15, which is electrically connected to the housing 11. The second deformable member 15 is configured to deform to contact the second electrode terminal 14, thereby electrically connecting the second electrode terminal 14 to the housing 11. For example, the second deformable member 15 is configured to deform to contact the second electrode terminal 14 when the internal pressure of the battery cell 10 reaches a second threshold, thereby electrically connecting the second electrode terminal 14 to the housing 11. The second threshold may be equal to or different from the first threshold.

[0129] When the internal pressure of the battery cell 10 reaches a certain level, such as a first threshold, the first deformable member 13 deforms, connecting the first electrode terminal 12 and the outer casing 11. When the internal pressure of the battery cell 10 reaches a second threshold, the second deformable member 15 deforms, connecting the second electrode terminal 14 and the outer casing 11. This causes the positive and negative electrodes of the battery cell 10 to be short-circuited internally. The instantaneously generated large current can melt the electrical connection components inside the battery cell 10, cutting off the charging and discharging circuit of the battery cell 10, thereby providing overcharge protection. In some embodiments, the electrical connection components that melt due to the internal short circuit of the battery cell 10 may include a first adapter and / or a second adapter. Exemplarily, the first adapter has a first fusible portion with a small width or thickness, which can melt when a large current passes through, thereby disconnecting the current path between the first tab 21 and the first electrode terminal 12.

[0130] In the above scheme, by setting the first deformable member 13, when the battery cell 10 is under abuse conditions such as overcharging, the pressure change inside the battery cell 10 can be used to deform the first deformable member 13 to effectively connect the first electrode post 121 to the first wall 111, thereby effectively realizing the positive and negative short circuit inside the battery cell 10. This causes the electrical connection components inside the battery cell 10 to melt due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell 10, thus playing the role of overcharge protection, reducing the risk of thermal runaway of the battery cell 10, and thus making the battery have high reliability.

[0131] According to some embodiments of this application, referring to FIG7, along the thickness direction z of the first wall, the projection of the first connecting portion 122 at least partially overlaps with the projection of the first deformable member 13. The second connecting portion 123 is connected to the first pole post 121.

[0132] In some embodiments, "the projection of the first connecting portion 122 and the projection of the first deformable member 13 at least partially overlap along the thickness direction z of the first wall" can be understood as the first deformable member 13 being able to deform and contact the first connecting portion 122 when the internal pressure of the battery cell 10 reaches a certain level.

[0133] In some embodiments, the first pole post 121 can be connected to the second connecting portion 123. Exemplarily, the second connecting portion 123 has a riveting hole, and a portion of the first pole post 121 can pass through the first wall 111 and engage with the riveting hole to be riveted to the second connecting portion 123. In some embodiments, due to riveting, the flatness of the surface of the second connecting portion 123 is less than that of the first connecting portion 122. Therefore, the first connecting portion 122 is more conducive to connecting to the busbar component than the second connecting portion 123. Thus, the first connecting portion 122 can be designed to protrude from the second connecting portion 123 for easy connection to the busbar component, and the second connecting portion 123 can be designed to be recessed from the first connecting portion 122 to form a clearance portion.

[0134] In some embodiments, the first connecting portion 122 and the second connecting portion 123 are arranged along a first direction x, which can be the length direction of the first conductive member 120. The first deformable member 13 is provided corresponding to the first connecting portion 122, and the first pole post 121 is provided corresponding to the second connecting portion 123. The first deformable member 13 and the first pole post 121 can be arranged along the first direction x.

[0135] In the above solution, by misaligning the first deformable part 13 and the first terminal post 121, so that the first deformable part 13 corresponds to the first connecting part 122 and the first terminal post 121 corresponds to the second connecting part 123, the risk of accidental contact between the first deformable part 13 and the first terminal post 121, resulting in a short circuit inside the battery cell 10 and affecting the reliability of the battery, can be effectively reduced, thereby making the battery highly reliable.

[0136] According to other embodiments of this application, along the thickness direction z of the first wall, the projection of the second connecting portion 123 at least partially overlaps with the projection of the first deformable member 13. The first connecting portion 122 is connected to the first pole post 121.

[0137] In some embodiments, "the projection of the second connecting portion 123 along the thickness direction z of the first wall at least partially overlaps with the projection of the first deformable member 13" can be understood as the first deformable member 13 being able to deform and contact the second connecting portion 123 when the internal pressure of the battery cell 10 reaches a certain level.

[0138] In some embodiments, the first connecting part 122 is connected to the first pole post 121, and the connection relationship between the first connecting part 122 and the first pole post 121 includes, but is not limited to, welding, riveting or threaded connection.

[0139] In some embodiments, the first connecting portion 122 and the second connecting portion 123 are arranged along a first direction x, which can be the length direction of the first conductive member 120. The first deformable member 13 is provided corresponding to the second connecting portion 123, and the first pole post 121 is provided corresponding to the first connecting portion 122. The first deformable member 13 and the first pole post 121 can be arranged along the first direction x.

[0140] In the above solution, by misaligning the first deformable part 13 and the first terminal post 121, so that the first deformable part 13 corresponds to the second connecting part 123 and the first terminal post 121 corresponds to the first connecting part 122, the risk of accidental contact between the first deformable part 13 and the first terminal post 121, resulting in a short circuit inside the battery cell 10 and affecting the reliability of the battery, can be effectively reduced, thereby making the battery highly reliable.

[0141] According to some embodiments of this application, please refer to FIG9, which is a schematic diagram of the first wall 111 in some embodiments of this application. The outer surface of the first wall 111 is provided with a first groove 1100 recessed into the battery cell 10, and at least a portion of the second connecting portion 123 is accommodated in the first groove 1100.

[0142] The first groove 1100 is a recessed portion formed on the outer surface of the first wall 111. The outer surface of the first wall 111 is the surface of the first wall 111 that faces away from the interior of the battery cell 10. In some embodiments, the first groove 1100 can be formed by stamping the first wall 111. In other embodiments, the first groove 1100 can be formed on the outer surface of the first wall 111 by slotting.

[0143] "At least a portion of the second connecting portion 123 is accommodated within the first groove 1100" can be understood as the entire second connecting portion 123 being located within the first groove 1100, or a portion of the second connecting portion 123 being located within the first groove 1100.

[0144] In some embodiments, the first connecting portion 122 may be located on the outer side of the first wall 111, and at least a portion of the second connecting portion 123 may be recessed into the first groove 1100.

[0145] In some embodiments, the first conductive element 120 includes a first connecting portion 122, a second connecting portion 123, and a third connecting portion 124. The first connecting portion 122 protrudes entirely from the second connecting portion 123. Taking the thickness direction z of the first wall as parallel to the direction of gravity as an example, the lower surface of the first connecting portion 122 is higher than the lower surface of the second connecting portion 123. The lower surface of the first connecting portion 122 is insulated from the outer surface of the first wall 111. The lower surface of the second connecting portion 123 is insulated from the bottom of the first groove 1100. The upper surface of the first connecting portion 122 is higher than the upper surface of the second connecting portion 123. The third connecting portion 124 connects the first connecting portion 122 and the second connecting portion 123, thereby achieving an alternating transition between the first connecting portion 122 and the second connecting portion 123 in the direction of gravity.

[0146] In some embodiments, referring to FIG9, a first through hole 1112 is formed on the first wall 111. The first through hole 1112 corresponds to the first deformable member 13. The first deformable member 13 closes the first through hole 1112. When the internal pressure of the battery cell 10 increases and causes the first deformable member 13 to deform, the first deformable member 13 can pass through the first through hole 1112 and contact the first conductive member 120. A second through hole 1113 is also formed on the first wall 111. The second through hole 1113 penetrates the bottom of the first groove 1100 and allows the first electrode post 121 to pass through.

[0147] In the above solution, by providing a first groove 1100 on the outer side of the first wall 111, at least a portion of the second connecting portion 123 can be accommodated, so that at least a portion of the first conductive member 120 sinks below the outer side of the first wall 111, which can effectively reduce the space occupied by the battery cell 10 in the thickness direction z of the first wall, thereby enabling a reasonable layout of the battery's structural components and effectively improving the volumetric energy density of the battery.

[0148] According to some embodiments of this application, please refer to FIG7. Along the direction away from the interior of the battery cell 10, the first electrode post 121 protrudes from the outer side of the first wall 111, and the height of the protrusion is not greater than 0.5mm.

[0149] In Figure 7, the “height of the protrusion” is labeled as H.

[0150] In some embodiments, the first terminal post 121 is connected to the second connecting portion 123. The second connecting portion 123 is located in the first groove 1100, and the first terminal post 121 passes through the second connecting portion 123 and protrudes from the outer surface of the first wall 111 in a direction away from the interior of the battery cell 10. The dimension H of the first terminal post 121 protruding from the outer surface of the first wall 111 may not be greater than 0.5 mm. Exemplarily, the value of H can be a value greater than 0 and less than or equal to 0.5 mm. For example, the value of H can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, any value between 0 and 0.1 mm, or any value between two adjacent values.

[0151] In the above scheme, by setting the height of the first electrode post 121 protruding from the outer side of the first wall 111 to no more than 0.5mm, on the one hand, the overall size of the battery cell 10 can be effectively reduced, and the space utilization rate can be improved, which is conducive to the improvement of the battery volumetric energy density; on the other hand, the occupation of the first electrode post 121 on the external space can be reduced, so that the battery structural components can be effectively arranged between the first connecting part 122 and the second connecting part 123, making the battery structure compact and the space utilization rate high, thereby improving the battery volumetric energy density.

[0152] According to some other embodiments of this application, the first electrode post 121 does not protrude from the outer side of the first wall 111 in a direction away from the interior of the battery cell 10.

[0153] In some embodiments, the entire second connection portion 123 is located within the first recess 1100. Along a direction away from the interior of the battery cell 10, the first electrode post 121 passes through the second connection portion 123 and does not protrude beyond the outer surface of the first wall 111. For example, taking the thickness direction z of the first wall as parallel to the direction of gravity, the upper surface of the first electrode post 121 may be flush with the outer surface of the first wall 111, or the upper surface of the first electrode post 121 may be located below the outer surface of the first wall 111.

[0154] In the above scheme, by setting the first electrode post 121 to not protrude from the outer side of the first wall 111, the space occupied by the first electrode post 121 can be effectively saved, so that the structural components of the battery can be effectively arranged between the first connecting part 122 and the second connecting part 123, making the battery structure compact and space utilization high, thereby improving the volumetric energy density of the battery.

[0155] According to some other embodiments of this application, the first electrode post 121 is recessed into the battery cell 10 relative to the outer side of the first wall 111, and the depth of the recess is no more than 1 mm.

[0156] In some embodiments, taking the thickness direction z of the first wall as parallel to the direction of gravity as an example, the entire first pole post 121 is located in the first groove 1100, and the upper surface of the first pole post 121 is located below the outer surface of the first wall 111. The distance between the upper surface of the first pole post 121 and the outer surface of the first wall 111 can be the "depth of the recess". In some embodiments, the value of the "depth of the recess" can be any value between 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm...0.8mm, 0.9mm, 1mm, 0 and 0.1mm, and any value between two adjacent values.

[0157] In the above solution, by setting the depth of the first electrode post 121 recessed into the outer side of the first wall 111 to no more than 1 mm, on the one hand, the overall size of the battery cell 10 can be effectively reduced, the space utilization rate can be improved, and the occupation of the external space by the first electrode post 121 can be reduced, so that the battery structural components can be effectively arranged between the first connecting part 122 and the second connecting part 123, making the battery structure compact and space utilization rate high, thereby improving the volumetric energy density of the battery; on the other hand, the impact on the internal space of the battery cell 10 caused by the sinking of the first electrode post 121 can be reduced, thereby ensuring the volumetric energy density of the battery cell 10 to a certain extent, and thus making the volumetric energy density of the battery high.

[0158] According to some embodiments of this application, please refer to FIG7, the battery cell 10 further includes a first insulating member 16, at least a portion of which is disposed between the first wall 111 and the first conductive member 120.

[0159] In some embodiments, the first insulating element 16 may be made of an insulating material, such as an organic insulating material, an inorganic insulating material, or a mixed insulating material. Exemplarily, in some embodiments of this application, the material of the first insulating element 16 may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the first insulating element 16 may also be made of other materials with insulating properties, such as polypropylene or polyethylene.

[0160] The phrase "at least a portion of the first insulating member 16 is disposed between the first wall 111 and the first conductive member 120" can be understood as meaning that the entire first insulating member 16 can be located between the first wall 111 and the first conductive member 120, or a portion of the first insulating member 16 can be located between the first wall 111 and the first conductive member 120. For example, referring to FIG7, a portion of the first insulating member 16 is located between the first wall 111 and the first conductive member 120, and another portion of the first insulating member 16 can also cover the outer peripheral surface of the first conductive member 120.

[0161] In some embodiments, a portion of the first insulating member 16 may be located between the first wall 111 and the first conductive member 120. For example, this portion may include a portion located between the outer side of the first wall 111 and the first connecting portion 122, a portion located between the first groove 1100 and the second connecting portion 123, and a portion located between the first groove 1100 and the third connecting portion 124. Another portion of the first insulating member 16 may also cover the outer peripheral surfaces of the first connecting portion 122, the second connecting portion 123, and the third connecting portion 124.

[0162] In the above solution, by setting the first insulating member 16, the first conductive member 120 and the first wall 111 can be effectively insulated and isolated, thereby reducing the risk of internal short circuit of the battery cell 10 caused by the first conductive member 120 and the first wall 111 overlapping, and thus improving the reliability of the battery.

[0163] According to some embodiments of this application, the first insulating element 16 and the first conductive element 120 are integrally injection molded.

[0164] In some embodiments, the first insulating element 16 and the first conductive element 120 can be manufactured by injection molding. Exemplarily, the first conductive element 120 is an aluminum structure, and the first insulating element 16 is a plastic structure. Molten plastic and aluminum are injected into a mold, and then fixed by pressure and cooling to obtain an integral first insulating element 16 and first conductive element 120. In some embodiments, the surface of the first conductive element 120 can be treated to form a porous surface. The first conductive element 120 is then placed in the mold and injection molded, so that the first insulating element 16 and the first conductive element 120 form a tight bond structure, completing the injection molding process.

[0165] In the above scheme, the first insulating component 16 and the first conductive component 120 are integrally injection molded. On the one hand, this can save the time of assembling the first insulating component 16 and the first conductive component 120 separately on the first wall 111, improve the manufacturing efficiency of the battery cell 10, and thus improve the manufacturing efficiency of the battery. On the other hand, it can enable the first insulating component 16 to effectively insulate and isolate the first wall 111 and the first conductive component 120, thereby reducing the risk of internal short circuit in the battery cell 10 caused by the first conductive component 120 overlapping with the first wall 111, and thus improving the reliability of the battery.

[0166] In some other embodiments, the first insulating member 16 and the first conductive member 120 can be separate structures. During assembly, the first insulating member 16 can be assembled to the first wall 111 first, and then the first conductive member 120 can be assembled to the first wall 111, such that at least a portion of the first insulating member 16 is located between the first conductive member 120 and the first wall 111.

[0167] According to some embodiments of this application, please refer to Figures 10-12. Figure 10 is a schematic diagram of the first conductive element 120 in some embodiments of this application, Figure 11 is a schematic diagram of the first conductive element 120 and the first insulating element 16 in some embodiments of this application, and Figure 12 is a schematic diagram of the first insulating element 16 in some embodiments of this application. The first insulating element 16 includes a bottom wall 160 and a side wall 161. The bottom wall 160 is disposed between the first wall 111 and the first conductive element 120, and the side wall 161 surrounds the bottom wall 160. The first conductive element 120 is located within the accommodating space formed by the side wall 161 and the bottom wall 160.

[0168] In some embodiments, the first insulating member 16 includes a bottom wall 160 and a side wall 161. The side wall 161 surrounds the edge of the bottom wall 160, and the side wall 161 and the bottom wall 160 together form an accommodating space, in which the first conductive member 120 is disposed. Along the thickness direction z of the first wall, the side of the first conductive member 120 facing the first wall 111 is covered by the bottom wall 160 of the first insulating member 16. The side wall 161 of the first insulating member 16 may cover at least a portion of the outer peripheral surface of the first conductive member 120. "The side wall 161 of the first insulating member 16 may cover at least a portion of the outer peripheral surface of the first conductive member 120" can be understood as meaning that the side wall 161 of the first insulating member 16 may completely cover the outer peripheral surface of the first conductive member 120, or that the side wall 161 of the first insulating member 16 may cover a portion of the outer peripheral surface of the first conductive member 120.

[0169] For example, referring to FIG11, the sidewall 161 of the first insulating member 16 can cover part of the outer peripheral surface of the first conductive member 120, while another part of the outer peripheral surface of the first conductive member 120 is not covered by the first insulating member 16.

[0170] In some embodiments, the bottom wall 160 of the first insulating member 16 is formed with a through hole, one of which may correspond to the first pole post 121, through which the first pole post 121 passes so that the first pole post 121 is connected to the first conductive member 120, and the other through hole may correspond to the first deformable member 13, through which the deformable first deformable member 13 passes to contact the first conductive member 120.

[0171] In the above solution, by setting the bottom wall 160 and the side wall 161, the first wall 111 and the first conductive element 120 can be effectively insulated and isolated, and the creepage distance between the first wall 111 and the first conductive element 120 can be increased, thereby reducing the risk of internal short circuit of the battery cell 10 caused by the first conductive element 120 overlapping with the first wall 111, and thus improving the reliability of the battery.

[0172] According to some embodiments of this application, please refer to FIG12, the bottom wall 160 is formed with a first clearance hole 166 and a second clearance hole 167. The first clearance hole 166 is for the first deformable member 13 to pass through, and the second clearance hole 167 is for the first pole post 121 to pass through.

[0173] In some embodiments, a first clearance hole 166 and a second clearance hole 167 are provided at intervals. The first clearance hole 166 may be provided corresponding to the first deformable member 13, allowing the deformable first deformable member 13 to pass through and contact the first conductive member 120. The second clearance hole 167 is provided corresponding to the first terminal 121, allowing the first terminal 121 to pass through so that the first terminal 121 is connected to the first conductive member 120.

[0174] In some embodiments, the first clearance hole 166 may be circular, square, triangular or other shapes. In some embodiments, the second clearance hole 167 may be circular, square, triangular or other shapes.

[0175] In the above scheme, by providing the first clearance hole 166, the first deformable member 13 can pass through the first insulating member 16 during deformation to contact the first conductive member 120, thereby achieving overcharge protection. By providing the second clearance hole 167, the risk of mutual interference between the first terminal post 121 and the first insulating member 16 can be reduced, the efficiency of assembling the first terminal post 121 into the first conductive member 120 can be improved, and thus the manufacturing efficiency of the battery cell 10 can be improved.

[0176] According to some embodiments of this application, along the thickness direction z of the first wall, a first protrusion 168 is formed on the side of the bottom wall 160 facing the first wall 111, and the first protrusion 168 is arranged around the first pole post 121.

[0177] In some embodiments, along the thickness direction z of the first wall, the side of the bottom wall 160 facing the first wall 111 is the inner side of the bottom wall 160, and the first protrusion 168 is formed on the inner side of the bottom wall 160 and protrudes toward the interior of the battery cell 10. Around the circumference of the first electrode post 121, the first protrusion 168 can be an annular structure to surround the outer circumferential surface of the first electrode post 121.

[0178] For example, in some embodiments, the bottom wall 160 may contact the bottom surface of the first groove 1100, and the first protrusion 168 may be located in the second through hole 1113 to insulate the first pole post 121 from the hole wall of the second through hole 1113.

[0179] In the above solution, by providing a first protrusion 168 on the inner side of the bottom wall 160 and surrounding the first pole post 121, the insulation effect between the first pole post 121 and the first wall 111 can be effectively improved, thereby improving the reliability of the battery cell 10 and thus improving the reliability of the battery 100.

[0180] According to some embodiments of this application, referring to FIG12, the bottom wall 160 includes a first sub-bottom wall 162 and a second sub-bottom wall 163. The first sub-bottom wall 162 is disposed between the first connecting portion 122 and the first wall 111, and the second sub-bottom wall 163 is disposed between the second connecting portion 123 and the first wall 111. Along the direction away from the interior of the battery cell 10, the first sub-bottom wall 162 protrudes from the second sub-bottom wall 163.

[0181] In some embodiments, the direction away from the interior of the battery cell 10 may be parallel to the direction of gravity or parallel to the height direction of the battery cell 10. In the direction of gravity, or in the height direction of the battery cell 10, the first sub-bottom wall 162 is higher than the second sub-bottom wall 163, that is, the surface of the first sub-bottom wall 162 away from the first wall 111 is located above the surface of the second sub-bottom wall 163 away from the first wall 111.

[0182] In some embodiments, the direction away from the interior of the battery cell 10 may be parallel to the direction of gravity or parallel to the height direction of the battery cell 10. In the direction of gravity, or in the height direction of the battery cell 10, the first sub-bottom wall 162 is entirely above the second sub-bottom wall 163, the second sub-bottom wall 163 may be disposed in the first groove 1100, and the first sub-bottom wall 162 may be disposed on the outer surface of the first wall 111.

[0183] The first sub-bottom wall 162 corresponds to the first connecting portion 122 and is located between the first wall 111 and the first connecting portion 122. The second sub-bottom wall 163 corresponds to the second connecting portion 123 and is located between the first wall 111 and the second connecting portion 123.

[0184] In the above scheme, by making the first sub-bottom wall 162 protrude from the second sub-bottom wall 163, the outer contour shape of the first insulating member 16 can correspond to the first conductive member 120, thereby reducing the space occupied by the first insulating member 16 in the thickness direction z of the first wall, making the battery cell 10 compact, which is conducive to improving the volumetric energy density, and thus making the battery have a high volumetric energy density.

[0185] According to some embodiments of this application, the first conductive element 120 further includes a third connecting portion 124, which connects the first connecting portion 122 and the second connecting portion 123. The bottom wall 160 further includes a third sub-bottom wall 164, which is disposed between the third connecting portion 124 and the first wall 111, and connects the first sub-bottom wall 162 and the second bottom wall 163.

[0186] In some embodiments, the direction away from the interior of the battery cell 10 can be parallel to the direction of gravity or parallel to the height direction of the battery cell 10. In the direction of gravity, or in the height direction of the battery cell 10, the first connecting portion 122 is entirely above the second connecting portion 123. The first connecting portion 122 transitions to the second connecting portion 123 via a third connecting portion 124, which can be inclined or parallel to the direction away from the interior of the battery cell 10. The first sub-bottom wall 162 is entirely above the second sub-bottom wall 163. The first sub-bottom wall 162 transitions to the second sub-bottom via a third sub-bottom wall 164. The second sub-bottom wall 163 can be disposed in the first groove 1100 and corresponding to the second connecting portion 123. The third sub-bottom wall 164 corresponds to the third connecting portion 124 and is located between the third connecting portion 124 and the first wall 111. The first sub-bottom wall 162 can be disposed on the outer surface of the first wall 111 and corresponding to the first connecting portion 122.

[0187] In the above solution, by providing the third connecting part 124, a smooth transition can be achieved between the first connecting part 122 and the second connecting part 123, reducing the molding difficulty of the first conductive element 120. This effectively creates a clearance between the first connecting part 122 and the second connecting part 123, avoiding structural components such as wiring harnesses and circuit boards, thus improving the space utilization of the battery's structural components and resulting in a compact battery structure, which is beneficial for increasing the battery's volumetric energy density. Simultaneously, the third sub-bottom wall 164 can be effectively positioned between the third connecting part 124 and the first wall 111, providing insulation and reducing the risk of internal short circuits in the battery cell 10 due to the overlap between the first conductive element 120 and the first wall 111, thereby improving the battery's reliability.

[0188] According to some embodiments of this application, please refer to Figures 7 and 12. The first insulating member 16 further includes a reinforcing portion 165, the two ends of which are connected to the side wall 161. An opening is formed between the reinforcing portion 165 and the third sub-bottom wall 164 for the third connecting portion 124 to pass through.

[0189] In some embodiments, the first insulating member 16 further includes a reinforcing portion 165, the opposite ends of which can be connected to the sidewall 161 of the first insulating member 16 to enhance the structural strength of the first insulating member 16. The reinforcing portion 165 and the third sub-bottom wall 164 are spaced apart to form an opening together, through which the third connecting portion 124 passes. The reinforcing portion 165 can be located between the first connecting portion 122 and the second connecting portion 123, and can be disposed on the outer peripheral surface of the third connecting portion 124 facing the second connecting portion 123.

[0190] In the above solution, by setting the reinforcing part 165, the structural strength of the first insulating member 16 can be improved, so that the first insulating member 16 is stably positioned between the first conductive member 120 and the first wall 111, effectively playing the role of insulation and isolation, thereby reducing the risk of internal short circuit of the battery cell 10 caused by the first conductive member 120 and the first wall 111 overlapping, and thus improving the reliability of the battery.

[0191] According to some embodiments of this application, please refer to Figures 4, 5, 6, and 13. Figure 13 is a schematic diagram of the first wall 111, the second conductive element 140, and the second terminal 141 in some embodiments of this application. The battery cell 10 also includes the second conductive element 140 and the second terminal 141. The second conductive element 140 is disposed on the outside of the first wall 111 and is insulated from the first wall 111. The second terminal 141 is electrically connected to the second conductive element 140, and the polarity of the second terminal 141 is opposite to that of the first terminal 121. The second conductive element 140 includes a fourth connecting portion 142 and a fifth connecting portion 143 that are interconnected. Along the direction away from the interior of the battery cell 10, the fourth connecting portion 142 protrudes from the fifth connecting portion 143, and the fourth connecting portion 142 is used to connect to a busbar component.

[0192] In some embodiments, the first wall 111 is provided with a second electrode terminal 14, the second electrode terminal 14 having the opposite polarity to the first electrode terminal 12. For example, the first electrode terminal 12 is a negative electrode terminal, and the second electrode terminal 14 is a positive electrode terminal.

[0193] The second electrode terminal 14 includes a second conductive element 140 and a second electrode post 141. The second conductive element 140 is disposed on the outer side of the first wall 111 and is insulated from the first wall 111. In some embodiments, the second conductive element 140 may be plate-shaped, and an insulating structure is provided between the second conductive element 140 and the first wall 111. The insulating structure may be made of plastic or other materials with insulating properties. At least a portion of the second electrode post 141 is located on the inner wall of the first wall 111 to connect with the tab of the electrode assembly 20. In some embodiments, the second electrode post 141 is directly connected to the second tab 22 of the corresponding polarity. In other embodiments, the second electrode post 141 is connected to the second tab 22 through a second adapter. In some embodiments, the materials of the second conductive element 140 and the second electrode post 141 may be metallic materials, such as aluminum, copper, iron, steel, alloys, or composite metals. The materials of the second conductive element 140 and the second electrode post 141 may be the same or different. For example, the second conductive element 140 may be made of aluminum, and the second electrode post 141 may be made of copper.

[0194] Referring to Figure 13, the second conductive element 140 includes a fourth connecting portion 142 and a fifth connecting portion 143 interconnected. Along a direction away from the interior of the battery cell 10, i.e., along the inner side of the first wall 111 towards the outer side of the first wall 111, the fourth connecting portion 142 protrudes beyond the fifth connecting portion 143, forming a clearance between them. Exemplarily, the second conductive element 140 is generally plate-shaped, with the fourth connecting portion 142 and the fifth connecting portion 143 arranged along its length. The fourth connecting portion 142 can protrude entirely beyond the fifth connecting portion 143, meaning the fifth connecting portion 143 is generally recessed compared to the fourth connecting portion 142. The area formed by the recess of the fifth connecting portion 143 can serve as a clearance. At the battery level, the clearance can accommodate wiring harnesses, circuit boards, or other structural components within the battery, allowing the battery cell 10 to avoid these components.

[0195] In some embodiments, the second conductive element 140 can be subjected to processes such as bending, stamping, or integral casting to form a relatively protruding fourth connecting portion 142 and a recessed fifth connecting portion 143, thereby forming a clearance portion between the fourth connecting portion 142 and the fifth connecting portion 143. Alternatively, the thickness of a portion of the second conductive element 140 can be adjusted to form a thinner fifth connecting portion 143 and a thicker fourth connecting portion 142.

[0196] In some embodiments, the thickness of the fourth connecting portion 142 and the thickness of the fifth connecting portion 143 may be equal or unequal. In some embodiments, the fifth connecting portion 143, which is recessed relative to the fourth connecting portion 142, may be connected to the second pole post 141. For example, the fifth connecting portion 143 may be riveted to the second pole post 141.

[0197] In some embodiments, the fourth connecting portion 142 may protrude entirely from the fifth connecting portion 143, and the fourth connecting portion 142 transitions to the fifth connecting portion 143 through a sixth connecting portion 144. One end of the sixth connecting portion 144 is connected to the fourth connecting portion 142, and the other end is connected to the fifth connecting portion 143.

[0198] In the above solution, by configuring the first connecting portion 122 for connection with the busbar component to protrude from the second connecting portion 123, that is, the second connecting portion 123 is recessed relative to the first connecting portion 122, a clearance portion can be formed between the first connecting portion 122 and the second connecting portion 123. In the battery, the clearance portion can avoid structural components such as wiring harnesses and circuit boards, improving the space utilization rate of the battery's structural components, making the battery structure compact, and facilitating the improvement of the battery's volumetric energy density.

[0199] According to some embodiments of this application, please refer to Figures 5 and 14. Figure 14 is a schematic diagram of the first wall 111 in some embodiments of this application. The first conductive element 120 and the second conductive element 140 are arranged along the first direction x. Along the first direction x, the second connecting portion 123 and the fifth connecting portion 143 are located between the first connecting portion 122 and the fourth connecting portion 142.

[0200] In some embodiments, the first direction x is perpendicular to the thickness direction z of the first wall. The first direction x is the length direction of the first wall 111, that is, the dimension of the first wall 111 in the first direction x is larger.

[0201] The phrase “Along the first direction x, the second connecting part 123 and the fifth connecting part 143 are located between the first connecting part 122 and the fourth connecting part 142” can be understood as the relatively protruding first connecting part 122 and the fourth connecting part 142 being located on the outside, while the relatively recessed second connecting part 123 and the fifth connecting part 143 being located on the inside.

[0202] In the above scheme, the first conductive element 120 and the second conductive element 140 are arranged along the first direction x. By setting the respective sunken second connecting part 123 and fifth connecting part 143 as the inner side, a larger size avoidance part can be formed above the first wall 111, thereby effectively avoiding structural components such as wire harnesses and circuit boards, improving the space utilization rate of the battery structural components, so as to make the battery structure compact and facilitate the improvement of battery volume energy density.

[0203] According to some embodiments of this application, please refer to FIG14, along the first direction x, the maximum distance between the second connecting part 123 and the fifth connecting part 143 is L, and the maximum dimension of the first wall 111 is M, satisfying 1.5≤M / L≤3.5.

[0204] In some embodiments, the maximum distance between the second connecting portion 123 and the fifth connecting portion 143 along the first direction x can be understood as the maximum dimension of the clearance portion formed jointly by the second connecting portion 123 and the fifth connecting portion 143 above the first wall 111 in the first direction x.

[0205] In some embodiments, the ratio M / L of the maximum dimension M of the first wall 111 along the first direction x to the maximum distance L between the second connecting portion 123 and the fifth connecting portion 143 can be between 1.5 and 3.5. For example, the value of M / L is 1.5, 2, 2.5, 3, 3.5 or any value between two adjacent values.

[0206] In some embodiments, the ratio M / L of the maximum dimension M of the first wall 111 along the first direction x and the maximum distance L between the second connecting part 123 and the fifth connecting part 143 can be between 1.5 and 2. For example, the value of M / L is 1.5, 1.6, 1.7, 1.8, 1.9, 2 or any value between two adjacent values.

[0207] In the above scheme, by setting the ratio M / L of the maximum dimension M of the first wall 111 in the first direction x to the maximum distance L between the second connecting part 123 and the fifth connecting part 143 in the first direction x to be not less than 1.5, the size of the clearance portion formed by the second connecting part 123 and the fifth connecting part 143 above the first wall 111 in the first direction x can be larger, so as to avoid larger external structural components, improve the space utilization rate of the battery structural components, so as to make the battery structure compact and facilitate the improvement of battery volumetric energy density; by setting the ratio M / L of the maximum dimension M of the first wall 111 in the first direction x to the maximum distance L between the second connecting part 123 and the fifth connecting part 143 in the first direction x to be not greater than 3.5, the occupation of the clearance portion on the electrode terminals can be reduced, so that the electrode terminals can be effectively connected to the busbar component.

[0208] According to some embodiments of this application, please refer to FIG13, the battery cell 10 further includes a second deformable member 15, which is electrically connected to the first wall 111. The second deformable member 15 is configured to deform to contact the second conductive member 140 to electrically connect the second terminal 141 to the first wall 111.

[0209] The second deformable member 15 is mounted on the first wall 111 and is electrically connected to the first wall 111. In some embodiments, the second deformable member 15 may be made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal. In some embodiments, the second deformable member 15 may be welded to the inner surface of the first wall 111.

[0210] The second deformable member 15 is a structural component that deforms under the internal pressure of the battery cell 10. The second deformable member 15 can be used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is under overcharge or other abuse conditions, the internal pressure increases. When the internal pressure reaches a second threshold, the second deformable member 15 deforms to contact the second conductive member 140, thereby connecting the first wall 111 and the second electrode terminal 14, short-circuiting the positive and negative electrodes inside the battery cell 10. In some embodiments, the first wall 111 has a through hole, and the second deformable member 15 can close the through hole. When the second deformable member 15 deforms, the deformed portion of the second deformable member 15 can pass through the through hole and contact the second conductive member 140. In some embodiments, the first threshold and the second threshold can be unequal or equal.

[0211] In some embodiments, the portion of the second deformable member 15 that contacts the second conductive member 140 may be the fourth connecting portion 142, or the portion of the second deformable member 15 that contacts the second conductive member 140 may be the fifth connecting portion 143, or the portion of the second deformable member 15 that contacts the second conductive member 140 may include both the fourth connecting portion 142 and the fifth connecting portion 143.

[0212] In some embodiments, the second deformable member 15 can be a flip-over piece 18, which flips over under pressure. In some embodiments, referring to FIG8, the outer contour of the flip-over piece 18 is disc-shaped, and includes a skirt 180, a flip foil 181, and an electrical connection portion 182 connected sequentially from the outside to the inside. The skirt 180 can be connected to the first wall 111, and the flip foil 181 is relatively thin and is used to deform and flip under pressure. After the flip foil 181 of the second deformable member 15 flips over, it can push the electrical connection portion 182 toward the second conductive member 140, thereby making the electrical connection portion 182 contact the second conductive member 140.

[0213] In some embodiments, when the battery cell 10 is in an abused condition due to overcharging, the internal pressure of the battery cell 10 increases. When the internal pressure of the battery cell 10 reaches a certain level, such as a first threshold, the first deformable member 13 deforms, short-circuiting the first electrode terminal 12 and the outer casing 11. When the internal pressure of the battery cell 10 reaches a second threshold, the second deformable member 15 deforms, short-circuiting the second electrode terminal 14 and the outer casing 11. This causes the positive and negative electrodes of the battery cell 10 to be short-circuited internally, creating an internal short circuit. The instantaneously generated large current can melt the electrical connection components inside the battery cell 10, cutting off the charging and discharging circuit of the battery cell 10, thereby providing overcharge protection. The melted electrical connection components may include a first adapter and / or a second adapter. Exemplarily, the first adapter has a first melting portion with a small width or thickness, so that when a large current passes through, the first melting portion can melt, thereby disconnecting the current path between the first tab 21 and the first electrode terminal 12.

[0214] In the above scheme, by setting the second deformable member 15, when the internal pressure of the battery cell 10 reaches a certain level, the deformation of the second deformable member 15 causes the second electrode post 141 to be electrically connected to the first wall 111. This allows the electrical connection components inside the battery cell 10 to melt due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell 10. This provides overcharge protection and reduces the risk of thermal runaway of the battery cell 10, thus making the battery more reliable.

[0215] According to some embodiments of this application, referring to FIG13, along the thickness direction z of the first wall, the projection of the fourth connecting portion 142 at least partially overlaps with the projection of the second deformable member 15. The fifth connecting portion 143 is connected to the second pole post 141.

[0216] In some embodiments, "the projection of the fourth connecting portion 142 along the thickness direction z of the first wall at least partially overlaps with the projection of the second deformable member 15" can be understood as the second deformable member 15 being able to deform and contact the fourth connecting portion 142 when the internal pressure of the battery cell 10 reaches a certain level.

[0217] In some embodiments, the second pole post 141 can be connected to the fifth connecting portion 143. Exemplarily, the fifth connecting portion 143 has a riveting hole, and a portion of the second pole post 141 can pass through the first wall 111 and engage with the riveting hole to be riveted to the fifth connecting portion 143. In some embodiments, due to riveting, the flatness of the surface of the fifth connecting portion 143 is less than that of the fourth connecting portion 142. Therefore, the fourth connecting portion 142 is more conducive to connecting to the busbar component than the fifth connecting portion 143. Thus, the fourth connecting portion 142 can be designed to protrude from the fifth connecting portion 143 to facilitate connection to the busbar component, and the fifth connecting portion 143 can be designed to be recessed from the second connecting portion 123 to form a clearance portion.

[0218] In some embodiments, the fourth connecting portion 142 and the fifth connecting portion 143 are arranged along a first direction x, which can be the length direction of the second conductive member 140. The second deformable member 15 is provided corresponding to the fourth connecting portion 142, and the second pole post 141 is provided corresponding to the fifth connecting portion 143. The second deformable member 15 and the second pole post 141 can be arranged along the first direction x.

[0219] In the above solution, by misaligning the second deformable member 15 and the second terminal post 141, so that the second deformable member 15 corresponds to the fourth connecting part 142 and the second terminal post 141 corresponds to the fifth connecting part 143, the risk of accidental contact between the second deformable member 15 and the second terminal post 141, resulting in a short circuit inside the battery cell 10 and affecting the reliability of the battery, can be effectively reduced, thereby making the battery highly reliable.

[0220] According to other embodiments of this application, along the thickness direction z of the first wall, the projection of the fifth connecting portion 143 at least partially overlaps with the projection of the second deformable member 15. The fourth connecting portion 142 is connected to the second pole post 141.

[0221] In some embodiments, "the projection of the fifth connecting portion 143 along the thickness direction z of the first wall at least partially overlaps with the projection of the second deformable member 15" can be understood as the second deformable member 15 being able to deform and contact the fifth connecting portion 143 when the internal pressure of the battery cell 10 reaches a certain level.

[0222] In some embodiments, the fourth connecting part 142 is connected to the second pole post 141, and the connection relationship between the fourth connecting part 142 and the second pole post 141 includes, but is not limited to, welding, riveting or threaded connection.

[0223] In some embodiments, the fourth connecting portion 142 and the fifth connecting portion 143 are arranged along a first direction x, which can be the length direction of the second conductive member 140. The second deformable member 15 is provided corresponding to the fifth connecting portion 143, and the second pole post 141 is provided corresponding to the fourth connecting portion 142. The second deformable member 15 and the second pole post 141 can be arranged along the first direction x.

[0224] In the above solution, by misaligning the second deformable member 15 and the second terminal post 141, so that the second deformable member 15 corresponds to the fifth connecting part 143 and the second terminal post 141 corresponds to the fourth connecting part 142, the risk of accidental contact between the second deformable member 15 and the second terminal post 141, resulting in a short circuit inside the battery cell 10 and affecting the reliability of the battery, can be effectively reduced, thereby making the battery highly reliable.

[0225] In some embodiments, referring to Figures 9 and 13, the outer surface of the first wall 111 is provided with a second groove 1111 recessed into the battery cell 10, and at least a portion of the fifth connecting portion 143 is accommodated within the second groove 1111. The second groove 1111 is a recessed portion formed on the outer surface of the first wall 111. In some embodiments, the second groove 1111 can be formed by stamping the first wall 111. In other embodiments, the second groove 1111 can be formed on the outer surface of the first wall 111 by slotting.

[0226] In some embodiments, the fourth connecting portion 142 may be located on the outer side of the first wall 111, and at least a portion of the fifth connecting portion 143 may be recessed into the second groove 1111.

[0227] In the above solution, by providing a second groove 1111 on the outer side of the first wall 111, at least a portion of the fifth connecting part 143 can be accommodated, so that at least a portion of the second conductive member 140 sinks below the outer side of the first wall 111, which can effectively reduce the space occupied by the battery cell 10 in the thickness direction z of the first wall, thereby enabling a reasonable layout of the battery's structural components and effectively improving the volumetric energy density of the battery.

[0228] In some embodiments, the second pole post 141 may protrude from the outer side of the first wall 111 in a direction away from the interior of the battery cell 10, or it may not protrude from the outer side of the first wall 111, or it may be located below the outer side of the first wall 111.

[0229] In some embodiments, when the second pole post 141 protrudes from the outer side of the first wall 111 in a direction away from the interior of the battery cell 10, the protrusion height is no greater than 0.5 mm. For example, the protrusion height can be any value between 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0 and 0.1 mm, or any value between two adjacent values.

[0230] In some embodiments, when the second electrode post 141 is located below the outer surface of the first wall 111 in a direction away from the interior of the battery cell 10, that is, when the second electrode post 141 is recessed into the battery cell 10 relative to the outer surface of the first wall 111, the depth of the recess is no greater than 1 mm. For example, the value of "depth of recess" can be any value between 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm...0.8 mm, 0.9 mm, 1 mm, 0 and 0.1 mm, or any value between two adjacent values.

[0231] In some embodiments, referring to FIG13, the battery cell 10 further includes a second insulating member 17, at least a portion of which is disposed between the first wall 111 and the second conductive member 140. In some embodiments, the second insulating member 17 may be made of an insulating material, such as an organic insulating material, an inorganic insulating material, or a mixed insulating material. Exemplarily, in some embodiments of this application, the material of the second insulating member 17 may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the second insulating member 17 may also be made of other materials with insulating properties such as polypropylene and polyethylene.

[0232] In the above solution, by setting the second insulating member 17, the second conductive member 140 and the first wall 111 can be effectively insulated and isolated, thereby reducing the risk of internal short circuit of the battery cell 10 caused by the second conductive member 140 and the first wall 111 overlapping, and thus improving the reliability of the battery.

[0233] In some embodiments, the outer contour of the second insulating member 17 and the outer contour of the second conductive member 140 may fit together. For example, the second insulating member 17 includes a bottom wall and a side wall. The side wall of the second insulating member 17 surrounds the edge of the bottom wall. The bottom wall of the second insulating member 17 is disposed between the first wall 111 and the second conductive member 140. The side wall of the second insulating member 17 is disposed on the outer peripheral surface of the second conductive member 140.

[0234] In some embodiments, similar to the first insulator 16 shown in FIG. 12, the bottom wall of the second insulator 17 may include a fourth sub-bottom wall, a fifth sub-bottom wall, and a sixth sub-bottom wall. The fourth sub-bottom wall is disposed between the fourth connecting portion 142 and the first wall 111, and the fifth sub-bottom wall is disposed between the fifth connecting portion 143 and the first wall 111. The sixth sub-bottom wall is disposed between the sixth connecting portion 144 and the first wall 111. The fourth sub-bottom wall protrudes beyond the fifth sub-bottom wall in a direction away from the interior of the battery cell 10.

[0235] In some embodiments, the direction away from the interior of the battery cell 10 can be parallel to the direction of gravity or parallel to the height direction of the battery cell 10. In the direction of gravity, or in the height direction of the battery cell 10, the fourth connecting portion 142 is entirely above the fifth connecting portion 143. The fourth connecting portion 142 transitions to the fifth connecting portion 143 via a sixth connecting portion 144, which can be inclined or parallel to the direction away from the interior of the battery cell 10. The fourth sub-bottom wall is entirely above the fifth sub-bottom wall, which transitions to the fifth sub-bottom wall via a sixth sub-bottom wall. The fifth sub-bottom wall can be disposed in the second groove 1111 and corresponding to the fifth connecting portion 143. The sixth sub-bottom wall corresponds to the sixth connecting portion 144 and is located between the sixth connecting portion 144 and the first wall 111. The fourth sub-bottom wall can be disposed on the outer surface of the first wall 111 and corresponding to the fourth connecting portion 142.

[0236] In some embodiments, similar to the first insulating member 16 shown in FIG12, the second insulating member 17 may include a reinforcing portion 165, the two ends of which are connected to the sidewall 161 of the second insulating member 17, and an opening is formed between the reinforcing portion 165 and the sixth sub-bottom wall of the second insulating member 17 for the sixth connecting portion 144 to pass through.

[0237] In some embodiments, the second insulating element 17 and the second conductive element 140 are integrally injection molded.

[0238] In some embodiments, as shown in FIG6, the first pole post 121 and the second pole post 141 are spaced apart along a first direction x. Along the first direction x, the first deformable member 13 is located on the side of the first pole post 121 opposite to the second pole post 141, and / or, the second deformable member 15 is located on the side of the second pole post 141 opposite to the first pole post 121.

[0239] In some embodiments, along the first direction x, the first deformable member 13, the first pole post 121, the second pole post 141, and the second deformable member 15 are arranged at intervals, that is, the first deformable member 13 and the second deformable member 15 are located outside the two pole posts with opposite polarities, and the two pole posts with opposite polarities are located between the first deformable member 13 and the second deformable member 15.

[0240] In some embodiments, along the first direction x, the first pole post 121, the first deformable member 13, the second pole post 141, and the second deformable member 15 are arranged alternately. In some other embodiments, along the first direction x, the first deformable member 13, the first pole post 121, the second deformable member 15, and the second pole post 141 are arranged alternately. In some other embodiments, along the first direction x, the first pole post 121, the first deformable member 13, the second pole post 141, and the second deformable member 15 are arranged alternately.

[0241] In the above scheme, with the electrode post on the outside of the deformable part, by setting the first deformable part 13 to the side away from the second electrode post 141, and / or setting the second deformable part 15 to the side away from the first electrode post 121, the internal current propagation path of the battery cell 10 can be shortened, the internal resistance of the battery cell 10 can be reduced, and the charging and discharging performance of the battery can be improved.

[0242] According to some embodiments of this application, a battery 100 is also provided, which has a battery cell 10 as described above. Referring to FIG3, the battery 100 includes a battery cell 10 and a housing 30, wherein the battery cell 10 is housed within the housing 30. The housing 30 is used to provide housing space for the battery cell 10, and the housing 30 may adopt various structures.

[0243] In the battery 100, there can be one or more battery cells 10, and each battery cell 10 can be fixed to the housing 30 by means of connectors (such as bolts), or each battery cell 10 can be fixed to the housing 30 by means of adhesive bonding.

[0244] According to some embodiments of this application, an energy storage device 2000 is also provided, which includes the battery cell 10 described above.

[0245] In some embodiments, individual battery cells 10 first constitute a battery 100, and one or more batteries 100 are then applied to an energy storage device 2000. Referring to FIG2, the energy storage device 2000 may include a cabinet 2001 and multiple batteries 100. The multiple batteries 100 may be disposed within the cabinet 2001. The multiple batteries 100 may be connected in series, in parallel, or in a mixed configuration.

[0246] According to some embodiments of this application, an electrical device is also provided, which includes the battery cell 10 described above. In some embodiments, the battery cell 10 first constitutes a battery 100, and one or more batteries 100 are then applied in the electrical device.

[0247] In some embodiments, referring to FIG1, the electrical device is a vehicle 1000. The interior of the vehicle 1000 may be equipped with a controller 200, a motor 300 and a battery 100, and the controller 200 is used to control the battery 100 to supply power to the motor 300.

[0248] According to some embodiments of this application, a battery cell 10 is provided, as shown in Figures 4-13. The battery cell 10 includes a housing 11, an electrode assembly 20, a first electrode terminal 12, a first deformable member 13, a second electrode terminal 14, a second deformable member 15, a first insulating member 16, and a second insulating member 17. The first electrode terminal 12 and the second electrode terminal 14 have opposite polarities.

[0249] The housing 11 includes a housing 110 and an end cap. The housing 110 has an internal cavity for accommodating the electrode assembly 20. The housing 110 has an opening communicating with the cavity. The end cap closes the opening of the housing 110, thus placing the electrode assembly 20 in a closed space. The end cap is a first wall 111. A first groove 1100 and a second groove 1111 are formed on the outer surface of the first wall 111.

[0250] In some embodiments, the battery cell 10 further includes a third insulating member 19, which may be made of plastic. The third insulating member 19 may be disposed on the lower surface of the end cap, that is, on the lower surface of the first wall 111, and may be used to insulate and isolate the first wall 111 and the electrode assembly 20.

[0251] The first electrode terminal 12 includes a first conductive element 120 and a first electrode post 121. The first conductive element 120 is disposed on the outside of the first wall 111 and insulated from the first wall 111 by a first insulating element 16. A portion of the first electrode post 121 is located inside the housing 11, and the other portion of the first electrode post 121 passes through the first wall 111 and is riveted to the first conductive element 120. The first electrode post 121 is connected to the first tab 21 of the electrode assembly 20 via a first adapter. The second electrode terminal 14 includes a second conductive element 140 and a second electrode post 141. The second conductive element 140 is disposed on the outside of the first wall 111 and insulated from the first wall 111 by a second insulating element 17. A portion of the second electrode post 141 is located inside the housing 11, and the other portion of the second electrode post 141 passes through the first wall 111 and is riveted to the second conductive element 140. The second electrode post 141 is connected to the second tab 22 of the electrode assembly 20 via a second adapter.

[0252] The first conductive element 120 includes a first connecting portion 122 and a second connecting portion 123 connected to each other. Along a direction away from the interior of the battery cell 10, the first connecting portion 122 protrudes from the second connecting portion 123 and is disposed on the outer surface of the first wall 111. The first connecting portion 122 is used to connect with an external busbar component. The second connecting portion 123 is disposed in the first groove 1100 and is riveted to the first terminal post 121. In some embodiments, the first insulating element 16 is integrally injection molded with the first conductive element 120. A portion of the first insulating element 16 is disposed between the first conductive element 120 and the first wall 111, and another portion of the first insulating element 16 covers a portion of the outer peripheral surface of the first conductive element 120.

[0253] The second conductive element 140 includes a fourth connecting portion 142 and a fifth connecting portion 143 connected to each other. Along a direction away from the interior of the battery cell 10, the fourth connecting portion 142 protrudes from the fifth connecting portion 143 and is disposed on the outer surface of the first wall 111. The fourth connecting portion 142 is used to connect to an external busbar component. The fifth connecting portion 143 is disposed in the second groove 1111 and is riveted to the second terminal post 141. In some embodiments, the second insulating element 17 is integrally injection molded with the second conductive element 140. A portion of the second insulating element 17 is disposed between the second conductive element 140 and the first wall 111, and another portion of the second insulating element 17 covers a portion of the outer peripheral surface of the second conductive element 140.

[0254] The first deformable member 13, the first terminal 121, the second terminal 141, and the second deformable member 15 are arranged along a first direction x. The first deformable member 13 is electrically connected to the first wall 111 and is configured to deform to contact the first connecting portion 122 to electrically connect the first terminal 121 to the first wall 111. The second deformable member 15 is electrically connected to the first wall 111 and is configured to deform to contact the fourth connecting portion 142 to electrically connect the second terminal 141 to the first wall 111.

[0255] In the above solution, by making the first connecting portion 122 for connecting to the busbar component protrude from the second connecting portion 123, and making the fourth connecting portion 142 for connecting to the busbar component protrude from the fifth connecting portion 143, a larger clearance portion can be formed on the outer side of the first wall 111. In the battery, the clearance portion can avoid structural components such as wiring harnesses and circuit boards, improving the space utilization rate of the battery's structural components, making the battery structure compact, and facilitating the improvement of the battery's volumetric energy density.

[0256] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, include: The outer shell has a first wall; A first conductive element is disposed on the first wall and is insulated from the first wall; The first terminal is electrically connected to the first conductive element; The first conductive component includes a first connecting portion and a second connecting portion that are connected to each other. Along a direction away from the interior of the battery cell, the first connecting portion protrudes from the second connecting portion and is used to connect to a busbar component.

2. The battery cell according to claim 1, wherein, The first conductive element is disposed on the outer side of the first wall.

3. The battery cell according to claim 1 or 2, wherein, The battery cell further includes a first deformable member electrically connected to the first wall. The first deformable member is configured to deform to contact the first conductive member to electrically connect the first terminal post to the first wall.

4. The battery cell according to claim 3, wherein, Along the thickness direction of the first wall, the projection of the first connecting portion at least partially overlaps with the projection of the first deformable member; The second connecting part is connected to the first pole post.

5. The battery cell according to claim 3, wherein, Along the thickness direction of the first wall, the projection of the second connecting portion at least partially overlaps with the projection of the first deformable member; The first connecting part is connected to the first pole post.

6. The battery cell according to any one of claims 1-5, wherein, The outer side of the first wall is provided with a first groove that is recessed into the battery cell, and at least a portion of the second connecting portion is accommodated in the first groove.

7. The battery cell according to claim 6, wherein, One of the following conditions must be met: (1) Along the direction away from the interior of the battery cell, the first electrode post protrudes from the outer side of the first wall, and the height of the protrusion is not greater than 0.5mm; (2) Along the direction away from the interior of the battery cell, the first electrode post does not protrude from the outer side of the first wall; (3) The outer side of the first electrode post relative to the first wall is recessed into the battery cell, and the depth of the recess is not greater than 1 mm.

8. The battery cell according to any one of claims 3-7, wherein, The battery cell further includes a first insulating member, at least a portion of which is disposed between the first wall and the first conductive member.

9. The battery cell according to claim 8, wherein, The first insulating component and the first conductive component are integrally injection molded.

10. The battery cell according to claim 8 or 9, wherein, The first insulating element includes a bottom wall and a side wall. The bottom wall is disposed between the first wall and the first conductive element, and the side wall surrounds the bottom wall. The first conductive element is located within the accommodating space formed by the side wall and the bottom wall.

11. The battery cell according to claim 10, wherein, The bottom wall has a first clearance hole and a second clearance hole. The first clearance hole allows the first deformable member to pass through, and the second clearance hole allows the first pole post to pass through.

12. The battery cell according to claim 11, wherein, Along the thickness direction of the first wall, a first protrusion is formed on the side of the bottom wall facing the first wall, and the first protrusion is circumferentially disposed around the first pole post.

13. The battery cell according to any one of claims 10-12, wherein, The bottom wall includes a first sub-bottom wall and a second sub-bottom wall, wherein the first sub-bottom wall is disposed between the first connecting portion and the first wall, and the second sub-bottom wall is disposed between the second connecting portion and the first wall; Along a direction away from the interior of the battery cell, the first sub-bottom wall protrudes from the second sub-bottom wall.

14. The battery cell according to claim 13, wherein, The first conductive element further includes a third connecting portion, which connects the first connecting portion and the second connecting portion; The bottom wall also includes a third sub-bottom wall, which is disposed between the third connecting portion and the first wall, and the third sub-bottom wall connects the first sub-bottom wall and the second sub-bottom wall.

15. The battery cell according to claim 14, wherein, The first insulating member further includes a reinforcing portion, the two ends of which are connected to the side wall, and an opening is formed between the reinforcing portion and the third sub-bottom wall for the third connecting portion to pass through.

16. The battery cell according to any one of claims 1-15, wherein, The battery cell also includes: The second conductive element is disposed on the outside of the first wall and is insulated from the first wall; The second terminal is electrically connected to the second conductive element, and the polarity of the second terminal is opposite to that of the first terminal. The second conductive element includes a fourth connection portion and a fifth connection portion that are connected to each other. The fourth connection portion protrudes from the fifth connection portion in a direction away from the interior of the battery cell, and the fourth connection portion is used to connect to a busbar component.

17. The battery cell according to claim 16, wherein, The first conductive element and the second conductive element are arranged along a first direction, and along the first direction, the second connecting portion and the fifth connecting portion are located between the first connecting portion and the fourth connecting portion.

18. The battery cell according to claim 17, wherein, Along the first direction, the maximum distance between the second connecting part and the fifth connecting part is L, and the maximum dimension of the first wall is M, satisfying 1.5≤M / L≤3.

5.

19. The battery cell according to any one of claims 16-18, wherein, The battery cell further includes a second deformable member electrically connected to the first wall. The second deformable member is configured to deform to contact the second conductive member to electrically connect the second terminal post to the first wall.

20. The battery cell according to claim 19, wherein, Along the thickness direction of the first wall, the projection of the fourth connecting portion at least partially overlaps with the projection of the second deformable member; The fifth connecting part is connected to the second pole post.

21. The battery cell according to claim 19, wherein, Along the thickness direction of the first wall, the projection of the fifth connecting portion at least partially overlaps with the projection of the second deformable member; The fourth connecting part is connected to the second pole post.

22. A battery, wherein, Includes the battery cell as described in any one of claims 1-21.

23. An energy storage device, wherein, Includes the battery cell as described in any one of claims 1-21.

24. An electrical appliance, wherein, Includes the battery cell according to any one of claims 1-21, the battery cell being used to provide electrical energy.

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