Battery cell, battery, energy storage device and electrical device

Abstract

A battery cell, a battery, an energy storage device and an electrical device. The battery cell comprises a casing, a first electrode terminal, a first deformable member and a first protective member. The casing has a first wall. The first electrode terminal is arranged on the first wall. The first deformable member is electrically connected to the first wall, and is configured to be deformable to contact the first electrode terminal so as to electrically connect the first electrode terminal to the first wall. In the direction of thickness of the first wall, at least part of the first protective member is arranged on the side of the first deformable member that faces away from the first electrode terminal, and the first protective member is configured to at least partially shield the first deformable member. The battery cell, the battery, the energy storage device and the electrical device can effectively improve the reliability of the battery.

Description

Battery cells, batteries, energy storage devices and electrical appliances Cross-reference of related applications

[0001] This application claims priority to Chinese patent application 202410704079.X, 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 battery reliability 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 reliability of the battery.

[0006] In a first aspect, some embodiments of this application provide a battery cell. The battery cell includes a casing, a first electrode terminal, a first deformable member, and a first protective member. The casing has a first wall. The first electrode terminal is disposed on the first wall. The first deformable member is electrically connected to the first wall and is configured to deform to contact the first electrode terminal, thereby electrically connecting the first electrode terminal to the first wall. Along the thickness direction of the first wall, at least a portion of the first protective member is disposed on the side of the first deformable member opposite to the first electrode terminal, and the first protective member is configured to at least partially shield the first deformable member.

[0007] In the above solution, by setting a first protective component to shield the first deformable component, the first deformable component is protected. This allows the first deformable component to deform under the internal pressure of the battery cell, effectively contacting the first electrode terminal. This effectively achieves an internal short circuit within the battery cell, causing the electrical connection components inside the battery cell to melt due to the large current generated by the short circuit, thus cutting off the charging and discharging circuit of the battery cell. This provides overcharge protection, reduces the risk of thermal runaway in the battery cell, and ultimately improves the battery's reliability. For example, during the manufacturing process of the battery cell, the first protective component can reduce the impact on the first deformable component during welding of the first electrode terminal to the internal structural components of the battery cell. For instance, it reduces the risk of weld spatter on the first deformable component causing it to fail. This allows the first deformable component to deform under abuse conditions such as overcharging of the battery cell to effectively contact the first electrode terminal, achieving overcharge protection and improving battery reliability.

[0008] According to some embodiments of this application, the first protective element is made of insulating material.

[0009] In the above solution, by setting the first protective component as an insulating material, the first protective component can play an insulating and isolating role for the first deformable component, reducing the risk of internal short circuit caused by short connection between the first deformable component and the internal structural components of the battery cell during normal charging and discharging, thereby improving the reliability of the battery cell and thus improving the reliability of the battery.

[0010] According to some embodiments of this application, the first protective member is a first protective cover, and at least a portion of the first deformable member is located inside the first protective cover.

[0011] In the above solution, by setting the first protective component as a cover structure to cover the first deformable component, the impact of welding the first electrode terminal to the internal structural components of the battery cell on the first deformable component is effectively reduced. This allows the first deformable component to deform under abuse conditions such as overcharging of the battery cell to effectively contact the first electrode terminal, thereby achieving overcharge protection and improving the reliability of the battery.

[0012] According to some embodiments of this application, the first protective cover has a vent that connects the inside and outside of the first protective cover.

[0013] In the above scheme, by setting a vent on the first protective cover, the internal pressure of the battery cell can be effectively applied to the first deformable part through the vent, thereby deforming the first deformable part to conduct the first wall and the first electrode terminal, playing the role of overcharge protection, and thus making the battery highly reliable.

[0014] According to some embodiments of this application, the vent does not face the first electrode terminal.

[0015] In the above solution, by setting the vent hole to not face the first electrode terminal, the impact on the first deformable part during the welding of the first electrode terminal to the internal structural parts of the battery cell can be effectively reduced. This allows the first deformable part to deform under abuse conditions such as overcharging of the battery cell to effectively contact the first electrode terminal, thereby achieving overcharge protection and improving the reliability of the battery.

[0016] According to some embodiments of this application, the first deformable member and the first electrode terminal are arranged along a first direction, and the orientation of the vent is perpendicular to the first direction.

[0017] In the above solution, by setting the orientation of the vent to be perpendicular to the first direction, on the one hand, during the battery cell manufacturing process, the impact of welding the first electrode terminal to the internal structural components of the battery cell on the first deformed part can be reduced, ensuring the structural integrity of the first deformed part to a certain extent, thereby effectively achieving the overcharge protection function and improving the reliability of the battery; on the other hand, it can reduce the risk of delayed deformation of the first deformed part caused by the obstruction of the internal pressure of the battery cell by the first electrode terminal, thereby effectively achieving the overcharge protection function and improving the reliability of the battery.

[0018] According to some embodiments of this application, the first protective cover includes a bottom wall and a side wall. Along the thickness direction of the first wall, the bottom wall is disposed on the side of the first deformable member opposite to the first electrode terminal, the side wall surrounds the bottom wall, and the vent is disposed on the side wall and / or the bottom wall.

[0019] In the above scheme, the first protective cover includes a bottom wall and a side wall. The bottom wall can protect the first deformable part in the thickness direction of the first wall, for example, blocking the welding slag generated when the first electrode terminal is welded to the internal structural components of the battery cell in the thickness direction of the first wall. The side wall can protect the first deformable part in the circumferential direction of the first deformable part, for example, blocking the welding slag generated when the first electrode terminal is welded to the internal structural components of the battery cell from the side of the first deformable part. This effectively improves the reliability of the first deformable part so that it can effectively contact the first electrode terminal under abuse conditions such as overcharging of the battery cell, thereby achieving the function of overcharge protection and improving the reliability of the battery.

[0020] According to some embodiments of this application, the sidewall includes a first sub-sidewall and two second sub-sidewalls. Along a first direction, the first sub-sidewall is located between the first deformable member and the first electrode terminal. Along a second direction, the two second sub-sidewalls are spaced apart, the first deformable member is located between the two second sub-sidewalls, and a vent is disposed on one of the second sub-sidewalls. The first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other.

[0021] In the above solution, on the one hand, by placing the first sidewall between the first deformable part and the first electrode terminal, welding slag can be effectively blocked from splashing onto the first deformable part, thereby reducing the risk that the first deformable part will be unable to deform and contact the first electrode terminal due to interference, enabling the battery cell to achieve overcharge protection and thus improving the reliability of the battery; on the other hand, by placing the vent on the second sub-sidewall, the internal pressure of the battery cell can be effectively applied to the first deformable part, thereby causing the first deformable part to contact the first electrode terminal under the action of internal pressure, enabling the battery cell to effectively achieve overcharge protection and thus improving the reliability of the battery.

[0022] According to some embodiments of this application, along the first direction, the maximum size of the vent is greater than or equal to 1 mm and less than or equal to 15 mm.

[0023] In the above scheme, by setting the maximum size of the vent in the first direction to be greater than or equal to 1 mm, the gas inside the battery cell can be effectively allowed to enter the first protective cover and act on the first deformable member. This allows the first deformable member to effectively contact the first electrode terminal for overcharge protection, resulting in high battery reliability and thus improving battery reliability. Conversely, by setting the maximum size of the vent in the first direction to be less than or equal to 15 mm, the impact on the structural strength of the first protective cover caused by the vent can be reduced. This allows the first protective cover to effectively protect the first deformable member from external substances, ensuring that the first deformable member effectively contacts the first electrode terminal for overcharge protection, further enhancing battery reliability. Therefore, by setting the maximum size of the vent in the first direction to be greater than or equal to 1 mm and less than or equal to 15 mm, both the breathability and structural strength of the first protective cover can be balanced, ensuring that the first deformable member effectively contacts the first electrode terminal for overcharge protection, resulting in high battery reliability and thus improving battery reliability.

[0024] According to some embodiments of this application, along the first direction, the maximum size of the vent is greater than or equal to 5 mm and less than or equal to 10 mm.

[0025] In the above scheme, by setting the maximum size of the vent in the first direction to be greater than or equal to 5mm, the gas inside the battery cell can be better introduced into the first protective cover to act on the first deformable member, allowing the first deformable member to effectively contact the first electrode terminal for overcharge protection, thus improving battery reliability. Conversely, by setting the maximum size of the vent in the first direction to be less than or equal to 10mm, the impact on the structural strength of the first protective cover caused by the vent can be effectively reduced, allowing the first protective cover to effectively protect the first deformable member from external influences, ensuring effective contact between the first deformable member and the first electrode terminal for overcharge protection, further enhancing battery reliability. Therefore, by setting the maximum size of the vent in the first direction to be greater than or equal to 5mm and less than or equal to 10mm, both the breathability and structural strength of the first protective cover can be balanced, ensuring effective contact between the first deformable member and the first electrode terminal for overcharge protection, thus improving battery reliability.

[0026] According to some embodiments of this application, the maximum size of the vent along the thickness direction of the first wall is greater than or equal to 1 mm and less than or equal to 5 mm.

[0027] In the above scheme, by setting the maximum size of the vent in the thickness direction of the first wall to be greater than or equal to 1 mm, the gas inside the battery cell can be effectively allowed to enter the first protective cover and act on the first deformable member. This allows the first deformable member to effectively contact the first electrode terminal for overcharge protection, resulting in high battery reliability and thus improving battery reliability. Conversely, by setting the maximum size of the vent in the thickness direction of the first wall to be less than or equal to 5 mm, the impact on the structural strength of the first protective cover caused by the vent can be reduced. This allows the first protective cover to effectively protect the first deformable member from external substances, ensuring that the first deformable member effectively contacts the first electrode terminal for overcharge protection, further enhancing battery reliability. Therefore, by setting the maximum size of the vent in the thickness direction of the first wall to be greater than or equal to 1 mm and less than or equal to 5 mm, both the breathability and structural strength of the first protective cover can be balanced, ensuring that the first deformable member effectively contacts the first electrode terminal for overcharge protection, resulting in high battery reliability and thus improving battery reliability.

[0028] According to some embodiments of this application, the maximum size of the vent along the thickness direction of the first wall is greater than or equal to 2 mm and less than or equal to 4 mm.

[0029] In the above scheme, by setting the maximum size of the vent in the thickness direction of the first wall to be greater than or equal to 2 mm, the gas inside the battery cell can be better introduced into the first protective cover to act on the first deformable member, allowing the first deformable member to effectively contact the first electrode terminal for overcharge protection, thus improving battery reliability. Conversely, by setting the maximum size of the vent in the thickness direction of the first wall to be less than or equal to 4 mm, the impact on the structural strength of the first protective cover caused by the vent can be effectively reduced, allowing the first protective cover to effectively protect the first deformable member from external influences, ensuring effective contact between the first deformable member and the first electrode terminal for overcharge protection, thus improving battery reliability. Therefore, by setting the maximum size of the vent in the thickness direction of the first wall to be greater than or equal to 2 mm and less than or equal to 4 mm, both the breathability and structural strength of the first protective cover can be balanced, ensuring effective contact between the first deformable member and the first electrode terminal for overcharge protection, thus improving battery reliability.

[0030] According to some embodiments of this application, the battery cell further includes a first insulating member disposed on the inner surface of the first wall. The first insulating member is used to insulate and isolate the first wall and the electrode assembly. The first insulating member has a first through hole through which a first electrode terminal passes. A first protective member is connected to the first insulating member.

[0031] In the above solution, on the one hand, by providing a first insulating member on the inner surface of the first wall, the first wall and the electrode assembly can be effectively insulated and isolated, reducing the risk of internal short circuits in the battery cell caused by contact between the first wall and the electrode assembly, thereby improving the reliability of the battery cell and thus the reliability of the battery. On the other hand, by connecting the first protective member and the first insulating member, a stable positional relationship can be achieved between the first protective member and the first deformable member, thereby effectively protecting the first deformable member, reducing interference from external substances, and allowing the first deformable member to deform under the internal pressure of the battery cell to effectively contact the first electrode terminal to provide overcharge protection, resulting in high battery reliability and thus improving battery reliability.

[0032] According to some embodiments of this application, the first protective member and the first insulating member are integrally formed.

[0033] In the above solution, the first protective component and the first insulating component are integrally formed, which gives the first protective component and the first insulating component high structural strength. On the one hand, it can effectively insulate and isolate the first wall and the electrode terminals, improve the reliability of the battery cell, and thus make the battery highly reliable. On the other hand, it can effectively protect the first deformable component, improve the reliability of the battery cell, and thus make the battery highly reliable. Furthermore, it can simplify the assembly steps of the battery cell, improve the manufacturing efficiency of the battery cell, and thus improve the manufacturing efficiency of the battery.

[0034] According to some embodiments of this application, the first protective member is disposed adjacent to the first through hole.

[0035] In the above scheme, by setting the first protective component adjacent to the first through hole, the integration of the first insulating component and the first protective component can be improved, the compactness of the internal structure of the battery cell can be improved, and the volumetric energy density of the battery cell can be increased.

[0036] According to some embodiments of this application, the first electrode terminal includes a first connecting portion located outside the first wall. The battery cell also includes a second insulating member, at least a portion of which is located between the first wall and the first connecting portion along the thickness direction of the first wall.

[0037] In the above solution, by setting a second insulating component, the first connecting part and the first wall can be effectively insulated and isolated, thereby reducing the risk of internal short circuit of the battery cell caused by the first connecting part and the first wall overlapping, and thus improving the reliability of the battery.

[0038] According to some embodiments of this application, the first wall has a second through hole, the second insulating member has a third through hole, the first deformable member closes the second through hole, and the second through hole and the third through hole are arranged opposite to each other along the thickness direction of the first wall.

[0039] In the above scheme, when the internal pressure of the battery cell reaches a certain level, the internal pressure of the battery cell can act on the first deformable member, causing the first deformable member to deform towards the outside of the first wall to effectively contact the first connection part of the first electrode terminal, thereby effectively realizing the internal short circuit of the battery cell. This causes 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 reduces the risk of thermal runaway of the battery cell and makes the battery more reliable.

[0040] According to some embodiments of this application, a first protrusion is provided on the outer surface of the first wall, and the first protrusion is arranged around the second through hole.

[0041] In the above scheme, by setting the first protrusion, the risk of external fluid entering the battery cell through the second through hole and interfering with the first deformable part, thus affecting the deformation of the first deformable part, can be effectively reduced. This allows the first deformable part to deform under the internal pressure of the battery cell to effectively contact the first electrode terminal, thereby effectively achieving an internal short circuit in the battery cell. This causes the electrical connection components inside the battery cell to melt due to the large current generated by the short circuit, thus 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.

[0042] According to some embodiments of this application, a first groove is formed on the surface of the second insulating member facing the first wall, and a first protrusion is disposed in the first groove.

[0043] In the above scheme, by setting the first groove to accommodate the first protrusion, it can effectively block external fluid from entering the battery cell and also serve to position the second insulating component, which is conducive to improving the assembly efficiency of the battery cell and thus improving the manufacturing efficiency of the battery.

[0044] According to some embodiments of this application, the first protrusion and the first groove are in clearance fit.

[0045] In the above scheme, by setting the first protrusion and the first groove to a clearance fit, the inside of the battery cell can be connected to the atmosphere. Thus, when the internal pressure of the battery cell reaches a certain level, the first deformable part can be effectively deformed to achieve overcharge protection of the battery.

[0046] According to some embodiments of this application, the inner peripheral surface of the first protrusion is flush with the wall of the second through hole.

[0047] In the above solution, by setting the first protrusion to be flush with the wall of the second through hole, the second through hole and the first protrusion can be formed simultaneously, thereby effectively reducing the forming difficulty of the first protrusion, improving the manufacturing efficiency of the battery cell, and thus improving the manufacturing efficiency of the battery.

[0048] According to some embodiments of this application, the battery cell further includes a second electrode terminal and a second deformable member, the second electrode terminal being disposed on the first wall. The second deformable member is electrically connected to the first wall and is configured to deform to contact the second electrode terminal, thereby electrically connecting the second electrode terminal to the first wall.

[0049] In the above scheme, by setting a second deformable member, when the internal pressure of the battery cell reaches a certain level, the deformation of the second deformable member allows it to contact the second electrode terminal, thereby making the second electrode terminal electrically connected to the second wall. Combined with the short circuit between the first deformable member and the first electrode terminal, the electrical connection components inside the battery cell melt due to the large current generated by the short circuit, thus 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, resulting in higher battery reliability. Furthermore, since both the first and second electrode terminals are insulated from the first wall under non-abuse conditions, the battery cell casing can be de-energized, facilitating the formation of an energy storage device. This reduces the risk of arcing and breakdown between adjacent battery cells in the energy storage device. Simultaneously, the second deformable member effectively provides overcharge protection, further enhancing the reliability of the energy storage device.

[0050] According to some embodiments of this application, a first electrode terminal and a second electrode terminal are spaced apart along a first direction. Along the first direction, a first deformable member is located on the side of the first electrode terminal opposite to the second electrode terminal, and / or, a second deformable member is located on the side of the second electrode terminal opposite to the first electrode terminal.

[0051] In the above scheme, with the electrode terminals on the outside of the deformable member, by setting the first deformable member to be located away from the second electrode terminal, and / or setting the second deformable member to be located away from the first electrode terminal, the current propagation path inside the battery cell can be shortened, the internal resistance of the battery cell can be reduced, and the charging and discharging performance of the battery can be improved.

[0052] Secondly, some embodiments of this application also provide a battery, which includes the battery cell provided in the first aspect.

[0053] Thirdly, some embodiments of this application also provide an energy storage device, which includes the battery cell provided in the first aspect.

[0054] 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.

[0055] 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

[0056] 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.

[0057] Figure 1 is a schematic diagram of the vehicle in some embodiments of this application;

[0058] Figure 2 is a schematic diagram of an energy storage device in some embodiments of this application;

[0059] Figure 3 is an exploded perspective view of the battery in some embodiments of this application;

[0060] Figure 4 is an exploded perspective view of a battery cell in some embodiments of this application;

[0061] Figure 5 is an exploded perspective view of a partial structure of a battery cell in some embodiments of this application;

[0062] Figure 6 is a schematic diagram of the first modified part of some embodiments of this application;

[0063] Figure 7 is a partial structural schematic diagram of a battery cell in some embodiments of this application;

[0064] Figure 8 is a schematic diagram of the internal structure of a battery cell in some embodiments of this application;

[0065] Figure 9 is a schematic diagram of the first wall, the first protective member, the first deformable member, and the first electrode terminal in some embodiments of this application;

[0066] Figure 10 is a schematic diagram of the first protective element in some embodiments of this application;

[0067] Figure 11 is a schematic diagram of the first insulating element in some embodiments of this application;

[0068] Figure 12 is a partial structural schematic diagram of the first insulating element in some embodiments of this application;

[0069] Figure 13 is an enlarged view of point A in Figure 9;

[0070] Figure 14 is a schematic diagram of the first wall in some embodiments of this application;

[0071] Figure 15 is a schematic diagram of the second insulating element in some embodiments of this application;

[0072] Figure 16 is a schematic diagram of the first wall, the second protective member, the second deformable member, and the second electrode terminal in some embodiments of this application.

[0073] Icons: 10-Battery cell; 11-Casing; 110-First wall; 1100-Second through hole; 1101-First protrusion; 1102-Fourth through hole; 1103-Second protrusion; 1104-First perforation; 111-Housing; 12-First electrode terminal; 120-First connecting part; 121-Second connecting part; 13-First deformable part; 130-First skirt; 131-First flip foil; 132-First electrical connection part; 14-First protective part; 140-Vent; 141-Bottom wall; 142-Side wall; 1420-First sub-side wall; 1421-Second sub-side wall; 15-First insulating part; 15a-Base part; 15b-Protrusion; 150-First through hole; 16 - Second insulating component; 160- Third through hole; 161- First groove; 162- First through hole; 17- Second electrode terminal; 170- Third connecting part; 171- Fourth connecting part; 18- Second deformable component; 19- Third insulating component; 190- Fifth through hole; 20- Electrode assembly; 21- First electrode tab; 22- Second electrode tab; 23- First adapter; 24- Second adapter; 25- Second protective component; 30- Housing; 31- First housing part; 32- Second housing part; 1000- Vehicle; 200- Controller; 300- Motor; 100- Battery; 2000- Energy storage device; 2001- Cabinet; x- First direction; y- Second direction; z- Thickness direction of the first wall. Detailed Implementation

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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).

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, battery reliability also needs to be considered.

[0086] 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 and contacts the electrode terminals, short-circuiting the casing and the electrode terminals. This short-circuit causes an internal short circuit within the battery cell, and the large current generated by the short circuit melts the internal electrical connection components, thereby cutting off the charging and discharging circuit of the battery cell and providing overcharge protection.

[0087] However, during the manufacturing process of a battery cell, welding the electrode terminals to the internal structural components of the battery cell (e.g., welding the electrode terminals to the tabs of the electrode assembly or welding them to the adapter to make an electrical connection with the tabs) can affect the deformable parts. For example, the temperature generated during welding can affect the deformable parts, or the welding slag generated during welding can splatter onto the deformable parts, causing damage to the deformable parts and preventing them from deforming to contact the electrode terminals under abuse conditions such as overcharging. This would prevent overcharge protection and affect the reliability of the battery.

[0088] In view of this, to improve the problem that welding of electrode terminals to internal structural components of the battery cell leads to the failure of deformable parts, resulting in the inability to conduct electricity between the battery cell casing and electrode terminals, thus affecting battery reliability, some embodiments of this application provide a battery cell including a casing, a first electrode terminal, a first deformable part, and a first protective part. The casing has a first wall. The first electrode terminal is disposed on the first wall. The first deformable part is electrically connected to the first wall and is configured to deform to contact the first electrode terminal, thereby electrically connecting the first electrode terminal to the first wall. Along the thickness direction of the first wall, at least a portion of the first protective part is disposed on the side of the first deformable part opposite to the first electrode terminal, and the first protective part is configured to at least partially shield the first deformable part.

[0089] In the above solution, by setting a first protective component to shield the first deformable component, the first deformable component is protected to a certain extent, ensuring its structural integrity. This allows the first deformable component to deform under the internal pressure of the battery cell, effectively contacting the first electrode terminal. This effectively achieves an internal short circuit within the battery cell, causing the electrical connection components inside the battery cell to melt due to the large current generated by the short circuit, thus cutting off the charging and discharging circuit of the battery cell. This provides overcharge protection, reduces the risk of thermal runaway in the battery cell, and ultimately improves the battery's reliability. For example, during the manufacturing process of the battery cell, the first protective component can reduce the impact on the first deformable component during welding of the first electrode terminal to the internal structural components of the battery cell. For instance, it reduces the risk of weld spatter on the first deformable component causing it to fail. This allows the first deformable component to deform under abuse conditions such as overcharging of the battery cell to effectively contact the first electrode terminal, achieving overcharge protection and improving battery reliability.

[0090] The technical solutions described in the embodiments of this application are applicable to batteries, energy storage devices using batteries, and electrical devices using batteries.

[0091] 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.

[0092] 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.

[0093] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0094] Figure 1 is a schematic diagram of a vehicle in some embodiments of this application.

[0095] 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.

[0096] Please refer to Figure 2, which is a schematic diagram of an energy storage device 2000 in some embodiments of this application.

[0097] 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.

[0098] Please refer to Figure 3, which is an exploded perspective view of the battery 100 in some embodiments of this application.

[0099] 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 a cylinder, a cuboid, etc.

[0100] 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.

[0101] Please refer to Figures 4-9. Figure 4 is an exploded perspective view of the battery cell 10 in some embodiments of this application. Figure 5 is an exploded perspective view of a partial structure of the battery cell 10 in some embodiments of this application. Figure 6 is a schematic diagram of the first deformable member 13 in some embodiments of this application. Figure 7 is a schematic diagram of a partial structure of the battery cell 10 in some embodiments of this application. Figure 8 is an internal schematic diagram of a partial structure of the battery cell 10 in some embodiments of this application. Figure 9 is a schematic diagram of the first wall 110, the first protective member 14, the first deformable member 13, and the first electrode terminal 12 in some embodiments of this application.

[0102] This application provides a battery cell 10 in some embodiments. The battery cell 10 includes a housing 11, a first electrode terminal 12, a first deformable member 13, and a first protective member 14. The housing 11 has a first wall 110. The first electrode terminal 12 is disposed on the first wall 110. The first deformable member 13 is electrically connected to the first wall 110 and is configured to deform to contact the first electrode terminal 12, thereby electrically connecting the first electrode terminal 12 to the first wall 110. Along the thickness direction z of the first wall, at least a portion of the first protective member 14 is disposed on the side of the first deformable member 13 opposite to the first electrode terminal 12, and the first protective member 14 is configured to at least partially shield the first deformable member 13.

[0103] 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 111 and an end cap. The shell 111 has an internal cavity for accommodating the electrode assembly 20. The shell 111 has an opening communicating with the cavity. The end cap closes to the opening of the shell 111, 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 111 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 111, one of which is closed by the end cap, and the other opening is closed by the base plate.

[0104] 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 111 or other parts of the housing 11 can be made of non-metallic materials.

[0105] In some embodiments, the housing 11 may be a sealed structure or a non-sealed structure.

[0106] As an example, when the outer casing 11 is a non-sealed structure, it only serves to protect the electrode assembly 20. The battery cell 10 includes a sealant for encapsulating components such as the electrode assembly and electrolyte. The outer casing 11 is disposed outside the sealant to protect the electrode assembly 20 or to limit the expansion of the electrode assembly 20. 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.

[0107] In some embodiments, when assembling the battery cell 10, the electrode assembly 20 can be placed into the housing 111 first, and electrolyte can be filled into the housing 111. Then, the end cap can be closed onto the opening of the housing 111 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 20 can be placed into the housing 111 first, and then the end cap can be closed onto the opening of the housing 111. Electrolyte can then be filled into the housing 111 through the injection hole on the end cap, and then the injection hole can be closed to complete the assembly of the battery cell 10.

[0108] 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.

[0109] The first wall 110 is a part of the outer casing 11. The first wall 110 can be used to support the first electrode terminal 12, so that the first electrode terminal 12 is in a stable state to realize the input and output of electrical energy. In some embodiments, the first wall 110 can be a part of the casing 111, such as the side wall 142 or the bottom wall 141 of the casing 111. In some embodiments, the first wall 110 can be an end cap.

[0110] The first electrode terminal 12 is a component mounted on the first wall 110. The first electrode terminal 12 is used for electrical connection with the electrode assembly 20, allowing current to flow into or out of the first tab 21 through the first electrode terminal 12. The first electrode terminal 12 and the first tab 21 have the same polarity. In some embodiments, the first electrode terminal 12 is made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal. In some embodiments, the first electrode terminal 12 can be connected to the first tab 21 via a first adapter 23. Exemplarily, the first tab 21 of the electrode assembly 20 is composed of multiple stacked first sub-tabs, and one end of the first adapter 23 can be welded to the first tab 21, and then the other end of the first adapter 23 can be welded to the first electrode terminal 12.

[0111] In some embodiments, the first electrode terminal 12 includes a first connecting portion 120 and a second connecting portion 121 connected to each other. At least a portion of the first connecting portion 120 may be located outside the first wall 110 to connect with an external structural member (e.g., a busbar) to enable current input and output. At least a portion of the second connecting portion 121 may be located inside the first wall 110 to connect with an internal structural member of the battery cell 10. Exemplarily, the second connecting portion 121 may be connected to the first tab 21 via a first adapter 23, or the second connecting portion 121 may be directly connected to the first tab 21. In some embodiments, the connection relationship between the first connecting portion 120 and the second connecting portion 121 includes, but is not limited to, welding, snap-fitting, riveting, or threaded connection. Exemplarily, the surface of the second connecting portion 121 facing the electrode assembly 20 is welded to the first adapter 23.

[0112] In some embodiments, the first wall 110 has an inner surface facing the electrode assembly 20 and an outer surface facing away from the electrode assembly 20. The inner surface of the first wall 110 may be provided with a first insulating member 15, which can insulate and isolate the first wall 110 and the electrode assembly 20. The outer surface of the first wall 110 may be provided with a second insulating member 16, which can insulate and isolate the second connection portion 121 and the first wall 110.

[0113] For example, the first insulating member 15 can be a plastic structure or other structure with insulating properties. The second insulating member 16 can be a plastic structure or other structure with insulating properties.

[0114] In some embodiments, the connection between the first insulating member 15 and the first wall 110 includes, but is not limited to, bonding, snap-fitting, threaded connection, or other methods of connection. The connection between the second insulating member 16 and the first wall 110 includes, but is not limited to, bonding, snap-fitting, threaded connection, or other methods of connection.

[0115] In some embodiments, along the thickness direction z of the first wall, the first insulating member 15 is formed with a first through hole 150, the first wall 110 is formed with a first through hole 1104, and the second insulating member 16 is formed with a first through hole 162. The first through hole 150, the first through hole 1104 and the first through hole 162 are correspondingly arranged for the second connecting part 121 to pass through and connect with the first connecting part 120.

[0116] The first deformable member 13 is mounted on the first wall 110 and is electrically connected to the first wall 110. 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 110.

[0117] The first deformable member 13 is a structural member that deforms under the internal pressure of the battery cell 10. The first deformable member 13 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is in an abuse condition such as overcharging, the internal pressure increases. When the internal pressure reaches a first threshold, the first deformable member 13 deforms to contact the first electrode terminal 12, thereby conducting the first wall 110 and the first electrode terminal 12, so that the positive and negative electrodes inside the battery cell 10 are short-circuited.

[0118] In some embodiments, the portion of the first deformable member 13 that is deformed by pressure to contact the first electrode terminal 12 may be the inner portion of the first wall 110 (e.g., the circumferential surface of the second connecting portion 121) or the outer portion of the first wall 110 (e.g., the first connecting portion 120).

[0119] Exemplary, in some embodiments of this application, the first wall 110 has a second through hole 1100. Along the thickness direction z of the first wall, the first deformable member 13 is disposed corresponding to and closes the second through hole 1100. The first connecting portion 120 is plate-shaped. Along the thickness direction z of the first wall, the projection of the first deformable member 13 falls in the projection of the first connecting portion 120. When the internal pressure of the battery cell 10 reaches a first threshold, the first deformable member 13 deforms toward the outside of the first wall 110 to pass through the second through hole 1100 and contact the first connecting portion 120.

[0120] In some embodiments, referring to FIG6, the first deformable member 13 can be a flip-over piece, which flips under pressure. The outer contour of the first deformable member 13 is disc-shaped, and includes, from the outside to the inside, a first skirt 130, a first flip foil 131, and a first electrical connection portion 132 connected in sequence. The first skirt 130 can be connected to the first wall 110. The first flip foil 131 is relatively thin and is used to deform and flip under pressure. After the first flip foil 131 flips, it can push the first electrical connection portion 132 toward the first electrode terminal 12, thereby making the first electrical connection portion 132 contact the first electrode terminal 12.

[0121] In some embodiments, the first electrode terminal 12 is electrically connected to the first tab 21 via the first adapter 23. The second tab 22 of the electrode assembly 20 can be electrically connected to the housing 11. The second tab 22 has the opposite polarity to the first tab 21. For example, the second tab 22 is directly connected to the housing 11 or via the second adapter 24, or the housing 11 is provided with a second electrode terminal 17, which is electrically connected to the housing 11, and the second tab 22 is directly connected to the second electrode terminal 17 or via the second adapter 24. 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.

[0122] In other embodiments, the first electrode terminal 12 is electrically connected to the first tab 21 via a first adapter 23. The second tab 22 of the electrode assembly 20 can be electrically connected to the second electrode terminal 17. The second tab 22 has the opposite polarity to the first tab 21. The second electrode terminal 17 can be insulatedly mounted to the housing 11, for example, insulatedly mounted to the first wall 110. The second tab 22 can be electrically connected to the second electrode terminal 17 via a second adapter 24. The second electrode terminal 17 is correspondingly provided with a second deformable member 18, which is electrically connected to the housing 11. The second deformable member 18 is configured to deform to contact the second electrode terminal 17, thereby electrically connecting the second electrode terminal 17 to the housing 11. For example, the second deformable member 18 is configured to deform to contact the second electrode terminal 17 when the internal pressure of the battery cell 10 reaches a second threshold, thereby electrically connecting the second electrode terminal 17 to the housing 11. The second threshold may be equal to or different from the first threshold.

[0123] When the internal pressure of the battery cell 10 reaches a certain level, such as the 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 the second threshold, the second deformable member 18 deforms, connecting the second electrode terminal 17 and the outer casing 11. This causes the positive and negative electrodes inside 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 playing the role of overcharge protection.

[0124] In some embodiments, the electrical connection component that melts due to an internal short circuit in the battery cell 10 may include a first adapter 23 and / or a second adapter 24. Exemplarily, the first adapter 23 has a first fuse portion with a small width or thickness, which can melt when a large current passes through, thereby breaking the current path between the first tab 21 and the first electrode terminal 12.

[0125] The first protective member 14 is a structural member disposed inside the battery cell 10. The function of the first protective member 14 includes shielding the first deformable member 13, thereby isolating the first deformable member 13 and the second connecting portion 121 from the part where they are connected to the internal structural members of the battery cell 10. In some embodiments, the first protective member 14 may be made of an insulating material, for example, the first protective member 14 may be a plastic structure.

[0126] The phrase "at least a portion of the first protective member 14 is disposed on the side of the first deformable member 13 opposite to the first electrode terminal 12 along the thickness direction z of the first wall" can be understood as follows: from the outer side of the first wall 110 to the inner side of the first wall 110, at least a portion of the first protective member 14 extends beyond the first deformable member 13 to be positioned on one side of the first electrode terminal 12, thereby shielding the first deformable member 13. Exemplarily, the first protective member 14 is plate-shaped and located between the first protective member 14 and the first electrode terminal 12. The first protective member 14 extends from the inner surface of the first wall 110 toward the electrode assembly 20, and the end of the first protective member 14 can extend beyond the portion of the first deformable member 13 closest to the electrode assembly 20. Alternatively, exemplarily, the first protective member 14 is cover-shaped, connected to and covering the inner surface of the first wall 110.

[0127] "The first protective member 14 is configured to at least partially shield the first deformable member 13" can be understood as the first protective member 14 being able to shield at least part of the first deformable member 13, for example, the first protective member 14 being able to shield the second connection portion 121 of the first deformable member 13 facing the first electrode terminal 12; it can also be understood as at least part of the first protective member 14 being able to shield the first protective member 14.

[0128] In the above scheme, by setting the first protective component 14 to shield the first deformable component 13, the reliability of the first deformable component 13 can be guaranteed to a certain extent. This allows the first deformable component 13 to deform under the internal pressure of the battery cell 10, effectively contacting the first electrode terminal 12. This effectively achieves an internal short circuit in the battery cell 10, causing the electrical connection components inside the battery cell 10 to melt due to the large current generated by the short circuit, thus cutting off the charging and discharging circuit of the battery cell 10. This provides overcharge protection, reduces the risk of thermal runaway in the battery cell 10, and ultimately makes the battery 100 more reliable. For example, during the manufacturing process of the battery cell 10, the first protective component 14 can reduce the impact on the first deformable component 13 during welding of the first electrode terminal 12 to the internal structural components of the battery cell 10. For instance, it reduces the risk of weld spatter splashing onto the first deformable component 13 during welding, causing it to fail. This allows the first deformable component 13 to deform under abuse conditions such as overcharging of the battery cell 10, effectively contacting the first electrode terminal 12, achieving overcharge protection, and thus improving the reliability of the battery 100.

[0129] According to some embodiments of this application, the first protective element 14 is made of insulating material.

[0130] In some embodiments, the first protective element 14 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 protective element 14 may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the first protective element 14 may also be made of other materials with insulating properties, such as polypropylene or polyethylene.

[0131] In the above scheme, by setting the first protective component 14 as an insulating material, the first protective component 14 can play the role of insulating and isolating the first deformable component 13, reducing the risk of internal short circuit caused by the first deformable component 13 and the internal structural components of the battery cell 10 during normal charging and discharging, thereby improving the reliability of the battery cell 10 and thus improving the reliability of the battery 100.

[0132] According to some embodiments of this application, please refer to Figures 9 and 10. Figure 10 is a schematic diagram of the first protective member 14 in some embodiments of this application. The first protective member 14 is a first protective cover, and at least a portion of the first deformable member 13 is located inside the first protective cover.

[0133] In some embodiments, "the first protective member 14 is a first protective cover" can be understood as the first protective member 14 being in the form of a cover. The first protective member 14 being in the form of a cover can be understood as the first protective member 14 having a bottom wall 141 and a side wall 142. The bottom wall 141 is located on the side of the first deformable member 13 away from the first wall 110. The side wall 142 is disposed on the edge of the bottom wall 141 and protrudes toward the first wall 110. At least a portion of the side wall 142 can be located between the second connection portion 121 of the first electrode terminal 12 and the first deformable member 13.

[0134] In some embodiments, "at least a portion of the first deformable member 13 is located inside the first protective cover" can be understood as the first protective cover being able to shield the portion of the first deformable member 13 facing the second connecting portion 121. For example, the side wall 142 of the first protective cover can shield the portion of the first deformable member 13 facing the second connecting portion 121, and the bottom wall 141 of the first protective cover can shield the portion of the first deformable member 13 away from the first wall 110.

[0135] For example, along the thickness direction z of the first wall, the projection of the first deformable member 13 can fall completely onto the first protective cover. The side wall 142 of the first deformable member 13 is not a closed structure, that is, it does not surround the bottom wall 141. For example, the side wall 142 of the first deformable member 13 is semi-arc or straight. The side wall 142 of the first deformable member 13 is disposed at the edge of the bottom wall 141 and located between the first deformable member 13 and the second connecting portion 121. Alternatively, for example, along the thickness direction z of the first wall, the projection of the first deformable member 13 can fall completely onto the first protective cover. The side wall 142 of the first deformable member 13 is a closed structure, that is, it surrounds the bottom wall 141, so that the side wall 142 surrounds the circumference of the first deformable member 13. Alternatively, for example, along the thickness direction z of the first wall, a portion of the projection of the first deformable member 13 falls onto the first protective cover. For example, the projection of the portion of the first deformable member 13 facing away from the second connecting portion 121 does not fall onto the first protective cover.

[0136] Alternatively, the first protective member 14 being in the shape of a cover can be understood as the first protective member 14 being able to cover at least a portion of the first deformable member 13. The at least a portion may include the part of the first deformable member 13 that is away from the first wall 110, and the part that includes the first deformable member 13 and the second connecting portion 121. For example, the first protective member 14 may be a spherical cover or a hemispherical cover.

[0137] In the above scheme, by setting the first protective member 14 as a cover structure to cover the first deformable member 13, the influence of welding the first electrode terminal 12 to the internal structural components of the battery cell 10 on the first deformable member 13 is effectively reduced. This allows the first deformable member 13 to deform under abuse conditions such as overcharging of the battery cell 10 to effectively contact the first electrode terminal 12, thereby achieving overcharge protection and improving the reliability of the battery 100.

[0138] According to some embodiments of this application, please refer to Figures 10 and 11. Figure 11 is a schematic diagram of the first insulating member 15 in some embodiments of this application.

[0139] The first protective cover has a vent 140, which connects the inside and outside of the first protective cover.

[0140] The vent 140 can be a through hole structure in the wall of the first protective cover. By setting the vent 140, the internal pressure of the battery cell 10 can act on the first deformable member 13 located inside the first protective cover, so that the first deformable member 13 can be deformed under force.

[0141] For example, the vent 140 may be provided on the side wall 142 and / or bottom wall 141 of the first protective cover.

[0142] In some embodiments, the vent 140 may be disposed on the side wall 142 of the first protective cover, and the orientation of the vent 140 may not be towards the second connection portion 121 of the first electrode terminal 12. In some embodiments, the vent 140 may be disposed on the bottom wall 141 of the first protective cover.

[0143] In some embodiments, the vent 140 may be square, circular, triangular or other shapes.

[0144] In the above scheme, by setting a vent 140 on the first protective cover, the internal pressure of the battery cell 10 can be effectively applied to the first deformable member 13 through the vent, thereby deforming the first deformable member 13 to conduct the first wall 110 and the first electrode terminal 12, so as to play the role of overcharge protection, and thus make the battery 100 highly reliable.

[0145] According to some embodiments of this application, the vent 140 does not face the first electrode terminal 12.

[0146] "The vent 140 does not face the first electrode terminal 12" can be understood as the projection of the wall surrounding the vent 140 along the axial direction of the vent 140 not overlapping with the projection of the first electrode terminal 12 along the axial direction of the vent 140. For example, the vent 140 can be disposed on the bottom wall 141 of the first protective cover, that is, the vent 140 is disposed facing the electrode assembly 20 of the battery cell 10; or, when the second connecting part 121 is located on the right side of the first deformable member 13, the vent 140 can be disposed on the side wall 142 of the first protective cover and not facing the right side, the vent 140 can be disposed facing the left side, the front side and / or the rear side.

[0147] In some embodiments, the second connecting portion 121 is located on the right side of the first deformable member 13, and the vent 140 may be disposed on the side wall 142 of the first protective cover and is disposed facing the front and rear sides.

[0148] In the above solution, by setting the vent hole to not face the first electrode terminal 12, the first deformable part 13 can be prevented from facing the first electrode terminal 12 to a certain extent. This effectively reduces the impact of welding the first electrode terminal 12 to the internal structural parts of the battery cell 10 on the first deformable part 13. As a result, the first deformable part 13 can deform under abuse conditions such as overcharging of the battery cell 10 to effectively contact the first electrode terminal 12, thereby achieving overcharge protection and improving the reliability of the battery 100.

[0149] According to some embodiments of this application, please refer to Figures 9 and 10. The first deformable member 13 and the first electrode terminal 12 are arranged along the first direction x, and the orientation of the vent 140 is perpendicular to the first direction x.

[0150] The first direction x can be perpendicular to the thickness direction z of the first wall. In some embodiments, the first wall 110 is square, the first direction x can be the length direction of the first wall 110, the second direction y can be the width direction of the first wall 110, and the first direction x, the second direction y and the thickness direction z of the first wall are mutually perpendicular.

[0151] The statement "the orientation of the vent 140 is perpendicular to the first direction x" can be understood as the orientation of the vent 140 being parallel to the thickness direction z of the first wall, and / or the orientation of the vent 140 being the second direction y.

[0152] In the above solution, by setting the orientation of the vent 140 to be perpendicular to the first direction x, on the one hand, during the manufacturing process of the battery cell 10, the impact of welding the first electrode terminal 12 to the internal structural components of the battery cell 10 on the first deformable part 13 can be reduced, ensuring the structural integrity of the first deformable part 13 to a certain extent, thereby effectively achieving the overcharge protection function and improving the reliability of the battery 100; on the other hand, it can reduce the risk of delayed deformation of the first deformable part 13 caused by the obstruction of the internal pressure of the battery cell 10 by the first electrode terminal 12, thereby effectively achieving the overcharge protection function and improving the reliability of the battery 100.

[0153] According to some embodiments of this application, please refer to Figures 9 and 10. The first protective cover includes a bottom wall 141 and a side wall 142. Along the thickness direction z of the first wall, the bottom wall 141 is disposed on the side of the first deformable member 13 opposite to the first electrode terminal 12, the side wall 142 surrounds the bottom wall 141, and the vent 140 is disposed on the side wall 142 and / or the bottom wall 141.

[0154] In some embodiments, the first protective cover is flat and has a bottom wall 141 and a side wall 142 surrounding the edge of the bottom wall 141. Along the thickness direction z of the first wall, the bottom wall 141 is located on the side of the first deformable member 13 opposite to the first wall 110, and the projection of the first deformable member 13 falls entirely on the bottom wall 141. The side wall 142 surrounds the edge of the bottom wall 141 and is arranged around the first deformable member 13 to completely cover the first deformable member 13 in the circumferential direction.

[0155] The phrase "vent 140 is disposed on side wall 142 and / or bottom wall 141" can be understood as follows: In some embodiments, part of the vent 140 is disposed on side wall 142, and part of the vent 140 is disposed on bottom wall 141. In other embodiments, the vent 140 is disposed on side wall 142. In still other embodiments, the vent 140 is disposed on bottom wall 141.

[0156] In the above scheme, the first protective cover includes a bottom wall 141 and a side wall 142. The bottom wall 141 can protect the first deformable member 13 in the thickness direction z of the first wall. For example, in the thickness direction z of the first wall, it can block the welding slag generated when the first electrode terminal 12 is welded to the internal structural components of the battery cell 10. The side wall 142 can protect the first deformable member 13 in the circumferential direction. For example, the side of the first deformable member 13 can block the welding slag generated when the first electrode terminal 12 is welded to the internal structural components of the battery cell 10. This effectively improves the reliability of the first deformable member 13 so that it can effectively contact the first electrode terminal 12 under abuse conditions such as overcharging of the battery cell 10, and achieve the function of overcharge protection, thereby improving the reliability of the battery 100.

[0157] According to some embodiments of this application, please refer to Figures 9-12. Figure 12 is a partial structural schematic diagram of the first insulating member 15 in some embodiments of this application.

[0158] The sidewall 142 includes a first sub-sidewall 1420 and two second sub-sidewalls 1421. Along a first direction x, the first sub-sidewall 1420 is located between the first deformable member 13 and the first electrode terminal 12. Along a second direction y, the two second sub-sidewalls 1421 are spaced apart, with the first deformable member 13 located between the two second sub-sidewalls 1421, and a vent 140 is disposed on the second sub-sidewall 1421. The first direction x, the second direction y, and the thickness direction z of the first wall are all perpendicular to each other.

[0159] In some embodiments, the bottom wall 141 of the first protective cover is polygonal, and the sidewalls 142 are formed by interconnecting a plurality of sub-sidewalls 142. The plurality of sub-sidewalls 142 include a first sub-sidewall 1420 and a second sub-sidewall 1421. Along the first direction x, the first sub-sidewall 1420 is located between the first deformable member 13 and the second connection portion 121 of the first electrode terminal 12. There are two second sub-sidewalls 1421, which are spaced apart from each other in the second direction y.

[0160] In some embodiments, the vent 140 extends through two second sub-sidewalls 1421 along the second direction y, allowing the internal pressure of the battery cell 10 to enter the first protective cover through the two second sub-sidewalls 1421 and act on the first deformable member 13, enabling the first deformable member 13 to deform. In some embodiments, the vent 140 is formed on one of the second sub-sidewalls 1421, allowing the internal pressure of the battery cell 10 to enter the first protective cover through this one second sub-sidewall 1421 and act on the first deformable member 13, enabling the first deformable member 13 to deform.

[0161] In the above scheme, on the one hand, by setting the first sidewall 142 between the first deformable member 13 and the first electrode terminal 12, welding slag can be effectively blocked from splashing onto the first deformable member 13, thereby reducing the risk that the first deformable member 13 will be unable to deform and contact the first electrode terminal 12 due to interference, so that the battery cell 10 can achieve overcharge protection, thereby improving the reliability of the battery 100; on the other hand, by setting the vent 140 on the second sub-sidewall 1421, the internal pressure of the battery cell 10 can be effectively applied to the first deformable member 13, so that the first deformable member 13 is contacted by the first electrode terminal 12 under the action of internal pressure, so that the battery cell 10 can effectively achieve overcharge protection, thereby improving the reliability of the battery 100.

[0162] According to some embodiments of this application, along the first direction x, the maximum size of the vent 140 is greater than or equal to 1 mm and less than or equal to 15 mm.

[0163] In some embodiments, the first protective cover is flat, and the second sub-sidewall 1421 has a larger dimension in the first direction x and a smaller dimension in the thickness direction z of the first wall.

[0164] Along the first direction x, the maximum size of the vent 140 can be understood as the size of the vent 140 that allows the airflow inside the battery cell 10 to enter the first protective cover to the greatest extent possible in the first direction x. For example, the vent is a square hole, and the distance between the two opposite hole walls of the vent along the first direction x is the maximum size of the vent 140 along the first direction x.

[0165] Please refer to Figure 12. Along the first direction x, the maximum size of the vent 140 is L1. The value of L1 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm...12mm, 13mm, 14mm, 15mm or any value between two adjacent values.

[0166] In the above scheme, by setting the maximum size of the vent 140 in the first direction x to be greater than or equal to 1 mm, the gas inside the battery cell 10 can be effectively allowed to enter the first protective cover to act on the first deformable member 13, so that the first deformable member 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100. By setting the maximum size of the vent 140 in the first direction x to be less than or equal to 15 mm, the impact of setting the vent 140 on the structural strength of the first protective cover can be reduced, so that the first protective cover can effectively protect the first deformable member 13 from the influence of external substances, so that the first deformable member 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100. Therefore, by setting the maximum size of the vent 140 in the first direction x to be greater than or equal to 1 mm and less than or equal to 15 mm, the breathability and structural strength of the first protective cover can be balanced, so that the first deformable part 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100.

[0167] According to some embodiments of this application, along the first direction x, the maximum size of the vent 140 is greater than or equal to 5 mm and less than or equal to 10 mm.

[0168] In some embodiments, the maximum size of the vent 140 along the first direction x is L1, and the value of L1 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or any value between two adjacent values.

[0169] In the above scheme, by setting the maximum size of the vent 140 in the first direction x to be greater than or equal to 5 mm, the gas inside the battery cell 10 can be better introduced into the first protective cover to act on the first deformable member 13, so that the first deformable member 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100. By setting the maximum size of the vent 140 in the first direction x to be less than or equal to 10 mm, the impact of setting the vent 140 on the structural strength of the first protective cover can be effectively reduced, so that the first protective cover can effectively protect the first deformable member 13 from the influence of external substances, so that the first deformable member 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100. Therefore, by setting the maximum size of the vent 140 in the first direction x to be greater than or equal to 5 mm and less than or equal to 10 mm, the breathability and structural strength of the first protective cover can be balanced, so that the first deformable part 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100.

[0170] According to some embodiments of this application, along the thickness direction z of the first wall, the maximum size of the vent 140 is greater than or equal to 1 mm and less than or equal to 5 mm.

[0171] In some embodiments, the first protective cover is flat, and the second sub-sidewall 1421 has a larger dimension in the first direction x and a smaller dimension in the thickness direction z of the first wall.

[0172] Along the thickness direction z of the first wall, the maximum size of the vent 140 can be understood as the size of the vent 140 that allows the airflow inside the battery cell 10 to enter the interior of the first protective cover to the greatest extent possible along the thickness direction z of the first wall. For example, the vent is a square hole, and the distance between two opposite hole walls along the thickness direction z of the first wall is the maximum size of the vent 140 along the thickness direction z of the first wall.

[0173] Please refer to Figure 12. Along the thickness direction z of the first wall, the maximum size of the vent 140 is W1. The value of W1 can be 1mm, 2mm, 3mm, 4mm, 5mm or any value between two adjacent values.

[0174] In the above scheme, by setting the maximum size of the vent 140 in the thickness direction z of the first wall to be greater than or equal to 1 mm, the gas inside the battery cell 10 can be effectively allowed to enter the first protective cover to act on the first deformable member 13, so that the first deformable member 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100. By setting the maximum size of the vent 140 in the thickness direction z of the first wall to be less than or equal to 5 mm, the impact of setting the vent 140 on the structural strength of the first protective cover can be reduced, so that the first protective cover can effectively protect the first deformable member 13 from the influence of external substances, so that the first deformable member 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100. Therefore, by setting the maximum size of the vent 140 in the thickness direction z of the first wall to be greater than or equal to 1 mm and less than or equal to 5 mm, the breathability and structural strength of the first protective cover can be balanced, so that the first deformable part 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100.

[0175] According to some embodiments of this application, along the thickness direction z of the first wall, the maximum size of the vent 140 is greater than or equal to 2 mm and less than or equal to 4 mm.

[0176] In some embodiments, the maximum size of the vent 140 along the thickness direction z of the first wall is W1, and the value of W1 can be 2mm, 3mm, 4mm or any value between two adjacent values.

[0177] In the above scheme, by setting the maximum size of the vent 140 in the thickness direction z of the first wall to be greater than or equal to 2 mm, the gas inside the battery cell 10 can be better introduced into the first protective cover to act on the first deformable member 13, so that the first deformable member 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100. By setting the maximum size of the vent 140 in the thickness direction z of the first wall to be less than or equal to 4 mm, the impact of setting the vent 140 on the structural strength of the first protective cover can be effectively reduced, so that the first protective cover can effectively protect the first deformable member 13 from the influence of external substances, so that the first deformable member 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100. Therefore, by setting the maximum size of the vent 140 in the thickness direction z of the first wall to be greater than or equal to 2 mm and less than or equal to 4 mm, the breathability and structural strength of the first protective cover can be balanced, so that the first deformable part 13 can effectively contact the first electrode terminal 12 to play the role of overcharge protection, thereby improving the reliability of the battery 100.

[0178] According to some embodiments of this application, please refer to Figures 7-11. The battery cell 10 further includes a first insulating member 15, which is disposed on the inner surface of the first wall 110. The first insulating member 15 is used to insulate and isolate the first wall 110 and the electrode assembly 20. The first insulating member 15 is provided with a first through hole 150, through which the first electrode terminal 12 passes. The first protective member 14 is connected to the first insulating member 15.

[0179] In some embodiments, the first insulating element 15 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 15 may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the first insulating element 15 may also be made of other materials with insulating properties, such as polypropylene or polyethylene.

[0180] In some embodiments, the first insulating member 15 may include a base member 15a and a protrusion 15b protruding from the base member 15a. The base member 15a may be connected to the inner surface of the first wall 110. The connection between the base member 15a and the first wall 110 may include, but is not limited to, bonding, snap-fitting, threaded connection, or other connection methods. The protrusion 15b may be used to abut against the electrode assembly 20 of the battery cell 10.

[0181] The first through hole 150 can be formed in the base member 15a, and the first through hole 150 can be a round hole, a square hole, or a hole of other shapes. The first through hole 150 is used for the first electrode terminal 12 to pass through.

[0182] In some embodiments, the first protective member 14 may be connected to the base member 15a. In some embodiments, the first protective member 14 is a first protective cover, and the end of the side wall 142 of the first protective cover opposite to the bottom wall 141 may be connected to the base member 15a.

[0183] In the above solution, on the one hand, by providing a first insulating member 15 on the inner surface of the first wall 110, the first wall 110 and the electrode assembly 20 can be effectively insulated and isolated, reducing the risk of internal short circuits in the battery cell 10 caused by contact between the first wall 110 and the electrode assembly 20, thereby improving the reliability of the battery cell 10 and thus improving the reliability of the battery 100. On the other hand, by connecting the first protective member 14 to the first insulating member 15, a stable positional relationship can be achieved between the first protective member 14 and the first deformable member 13, thereby effectively protecting the first deformable member 13, reducing interference from external substances to the first deformable member 13, and allowing the first deformable member 13 to deform under the internal pressure of the battery cell 10 to effectively contact the first electrode terminal 12 to provide overcharge protection, resulting in high reliability of the battery 100 and thus improving the reliability of the battery 100.

[0184] According to some embodiments of this application, the first protective member 14 and the first insulating member 15 are integrally formed.

[0185] In some embodiments, the first protective member 14 and the first insulating member 15 can be integrally molded structures, manufactured by an integral molding process. For example, the first protective member 14 and the first insulating member 15 are made of the same material, both being plastic structures, and are manufactured by plastic molding.

[0186] "The first protective component 14 and the first insulating component 15 are integrally formed" can be understood as the first protective component 14 being a part of the structure of the first insulating component 15. For example, in some embodiments, the first insulating component 15 is the lower plastic of the battery cell 10, and the first protective component 14 is a structural component formed at the bottom of the lower plastic.

[0187] In the above scheme, the first protective component 14 and the first insulating component 15 are integrally formed, so that the first protective component 14 and the first insulating component 15 have high structural strength. On the one hand, they can effectively insulate and isolate the first wall 110 and the electrode terminals, improve the reliability of the battery cell 10, and thus make the battery 100 highly reliable. On the other hand, they can effectively protect the first deformable component 13, improve the reliability of the battery cell 10, and thus make the battery 100 highly reliable. Furthermore, they can simplify the assembly steps of the battery cell 10, improve the manufacturing efficiency of the battery cell 10, and thus improve the manufacturing efficiency of the battery 100.

[0188] In other embodiments, the first protective member 14 and the first insulating member 15 can be separate structures, and the first protective member 14 can be connected to the first insulating member 15 by means of bonding, welding or snap-fitting.

[0189] According to some embodiments of this application, please refer to Figures 10 and 11, the first protective member 14 is disposed adjacent to the first through hole 150.

[0190] In some embodiments, "the first protective member 14 is disposed adjacent to the first through hole 150" can be understood as the first protective member 14 and the hole wall of the first through hole 150 sharing a wall portion.

[0191] For example, the first through hole 150 includes a through hole structure that penetrates the first insulating member 15 and a convex ring structure surrounding the through hole structure. The convex ring structure can be arranged around the first electrode terminal 12, and the first protective member 14 can be arranged with the convex ring structure sharing the same wall.

[0192] In the above scheme, by setting the first protective member 14 adjacent to the first through hole 150, the integration of the first insulating member 15 and the first protective member 14 can be improved, the compactness of the internal structure of the battery cell 10 can be improved, and the volumetric energy density of the battery cell 10 can be improved.

[0193] In some other embodiments, the first protective member 14 and the first through hole 150 may be spaced apart from each other.

[0194] According to some embodiments of this application, referring to FIG5, the first electrode terminal 12 includes a first connecting portion 120, which is located outside the first wall 110. The battery cell 10 also includes a second insulating member 16, at least a portion of which is located between the first wall 110 and the second connecting portion 120 along the thickness direction z of the first wall.

[0195] In some embodiments, the first electrode terminal 12 includes a first connecting portion 120 and a second connecting portion 121 connected to each other. At least a portion of the first connecting portion 120 may be located outside the first wall 110 to connect with an external structural member (e.g., a busbar) to enable current input and output. At least a portion of the second connecting portion 121 may be located inside the first wall 110 to connect with an internal structural member of the battery cell 10. The first connecting portion 120 and the second connecting portion 121 clamp the first wall 110 so that the first electrode terminal 12 can be mounted on the first wall 110.

[0196] The second insulating member 16 is an insulating structure at least partially disposed between the first wall 110 and the first connecting portion 120. In some embodiments, the second insulating member 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 second insulating member 16 may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the second insulating member 16 may also be made of other materials with insulating properties, such as polypropylene and polyethylene.

[0197] In some embodiments, the first wall 110 is formed with a recessed platform, and the second insulating member 16 may be embedded in the recessed platform.

[0198] In some embodiments, the second insulating member 16 is formed with a first through hole 162, which is provided corresponding to the first through hole 150 and the first through hole 1104.

[0199] In some embodiments, the second insulating member 16 may be plate-shaped and located between the first wall 110 and the first connecting portion 120. In some embodiments, a portion of the second insulating member 16 is disposed between the first wall 110 and the first connecting portion 120, a portion surrounds the peripheral surface of the first connecting portion 120, and the remaining portion may be located in the first through hole 1104 to insulate and isolate the first electrode terminal 12 from the hole wall of the first through hole 1104.

[0200] In the above solution, by setting the second insulating member 16, the first connecting part 120 and the first wall 110 can be effectively insulated and isolated, thereby reducing the risk of internal short circuit of the battery cell 10 caused by the first connecting part 120 and the first wall 110 overlapping, and thus improving the reliability of the battery 100.

[0201] According to some embodiments of this application, referring to FIG5, the first wall 110 has a second through hole 1100, the second insulating member 16 has a third through hole 160, the first deformable member 13 closes the second through hole 1100, and the second through hole 1100 and the third through hole 160 are arranged opposite to each other along the thickness direction z of the first wall.

[0202] In some embodiments, the first wall 110 has a second through hole 1100, and the second insulating member 16 has a third through hole 160 corresponding to the second through hole 1100. The second through hole 1100 and the third through hole 160 can be coaxially arranged. In some embodiments, the second through hole 1100 can be a circular hole, a square hole, or a hole structure of other shapes. In some embodiments, the third through hole 160 can be a circular hole, a square hole, or a hole structure of other shapes.

[0203] In some embodiments, the size of the third through hole 160 may be smaller than the size of the second through hole 1100, for example, the inner diameter of the third through hole 160 may be smaller than the inner diameter of the second through hole 1100.

[0204] "The first deformable part 13 closes the second through hole 1100" can be understood as the first deformable part 13 can close the second through hole 1100 to reduce the risk of external substances entering the battery cell 10, and at the same time reduce the risk of substances inside the battery cell 10 leaking through the second through hole 1100.

[0205] In some embodiments, when the first deformable member 13 is deformed by the internal pressure of the battery cell 10, the first flip foil 131 of the first deformable member 13 can pass through the second through hole 1100 and the third through hole 160 to contact the first connecting portion 120.

[0206] In the above scheme, when the internal pressure of the battery cell 10 reaches a certain level, the internal pressure of the battery cell 10 can act on the first deformable member 13, causing the first deformable member 13 to deform towards the outside of the first wall 110 to effectively contact the first connection portion 120 of the first electrode terminal 12, thereby effectively realizing the internal short circuit of 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. This reduces the risk of thermal runaway of the battery cell 10, and thus makes the battery 100 have high reliability.

[0207] According to some embodiments of this application, please refer to Figures 13 and 14. Figure 13 is an enlarged view of point A in Figure 9, and Figure 14 is a schematic diagram of the first wall 110 in some embodiments of this application.

[0208] The outer surface of the first wall 110 is provided with a first protrusion 1101, which surrounds the second through hole 1100.

[0209] The outer surface of the first wall 110 can be the surface of the first wall 110 that faces away from the interior of the battery cell 10. The first protrusion 1101 is a portion that protrudes from the outer surface of the first wall 110. The first protrusion 1101 is disposed around the second through hole 1100 to serve to block the second through hole 1100. In some embodiments, the first protrusion 1101 is annular and is disposed around one or more circumferences of the second through hole 1100. The first protrusion 1101 can be circular or polygonal.

[0210] In the above solution, by setting the first protrusion 1101, the risk of external fluid entering the battery cell 10 through the second through hole 1100 and interfering with the first deformable member 13, thus affecting the deformation of the first deformable member 13, can be effectively reduced. This allows the first deformable member 13 to deform under the internal pressure of the battery cell 10, effectively contacting the first electrode terminal 12, thereby effectively achieving an internal short circuit in 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, thus cutting off the charging and discharging circuit of the battery cell 10, thereby providing overcharge protection and reducing the risk of thermal runaway of the battery cell 10, and ultimately making the battery 100 more reliable. For example, when injecting electrolyte into the battery cell 10, there is a possibility of electrolyte spilling onto the first wall 110. By setting the first protrusion 1101, the risk of electrolyte on the first wall 110 entering the battery cell 10 through the second through hole 1100 and interfering with the first deformable member 13, thus causing the first deformable member 13 to fail, can be effectively reduced.

[0211] According to some embodiments of this application, please refer to FIG15, which is a schematic diagram of the second insulating member 16 in some embodiments of this application. A first groove 161 is formed on the surface of the second insulating member 16 facing the first wall 110, and a first protrusion 1101 is disposed in the first groove 161.

[0212] In some embodiments, corresponding to the first protrusion 1101, the surface of the second insulating member 16 may be formed with a first groove 161, which may be annular and able to accommodate the first protrusion 1101.

[0213] In the above scheme, by setting the first groove 161 to accommodate the first protrusion 1101, it can effectively block external fluid from entering the battery cell 10, and can also position the second insulating component 16, which is conducive to improving the assembly efficiency of the battery cell 10 and thus improving the manufacturing efficiency of the battery 100.

[0214] According to some embodiments of this application, please refer to FIG13, the first protrusion 1101 and the first groove 161 are in clearance fit.

[0215] In some embodiments, "the first protrusion 1101 and the first groove 161 are in clearance fit" can be understood as the outer surface of the first protrusion 1101 and the groove wall of the first groove 161 being spaced apart from each other.

[0216] In the above scheme, by setting the first protrusion 1101 and the first groove 161 as a clearance fit, the inside of the battery cell 10 can be connected with the atmosphere. Thus, when the pressure inside the battery cell 10 reaches a certain level, the first deformable member 13 can be effectively deformed to achieve overcharge protection of the battery 100.

[0217] According to some embodiments of this application, please refer to FIG13, the inner peripheral surface of the first protrusion 1101 is flush with the wall of the second through hole 1100.

[0218] In some embodiments, the first protrusion 1101 may protrude in a square shape away from the interior of the battery cell 10 along the hole wall of the second through hole 1100, so that the inner peripheral surface of the first protrusion 1101 and the hole wall of the second through hole 1100 are coplanar.

[0219] In the above solution, by setting the first protrusion 1101 to be flush with the wall of the second through hole 1100, the second through hole 1100 and the first protrusion 1101 can be formed simultaneously, thereby effectively reducing the forming difficulty of the first protrusion 1101, improving the manufacturing efficiency of the battery cell 10, and thus improving the manufacturing efficiency of the battery 100.

[0220] In some other embodiments, the inner peripheral surface of the first protrusion 1101 may also be spaced apart from the wall of the second through hole 1100.

[0221] According to some embodiments of this application, please refer to Figures 5, 8, and 16. Figure 16 is a schematic diagram of the first wall 110, the second protective member 25, the second deformable member 18, and the second electrode terminal 17 in some embodiments of this application. The battery cell 10 also includes the second electrode terminal 17 and the second deformable member 18. The second electrode terminal 17 is disposed on the first wall 110. The second deformable member 18 is electrically connected to the first wall 110 and is configured to deform to contact the second electrode terminal 17, so as to electrically connect the second electrode terminal 17 to the first wall 110.

[0222] The second electrode terminal 17 is a component mounted on the first wall 110. The second electrode terminal 17 is used for electrical connection with the electrode assembly 20, allowing current to flow into or out of the second electrode tab 22 via the second electrode terminal 17. The second electrode terminal 17 and the second electrode tab 22 have the same polarity. In some embodiments, when the first electrode terminal 12 is a positive electrode terminal, the second electrode terminal 17 is a negative electrode terminal. When the first electrode terminal 12 is a negative electrode terminal, the second electrode terminal 17 is a positive electrode terminal.

[0223] In some embodiments, the second electrode terminal 17 is made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal. In some embodiments, the second electrode terminal 17 can be connected to the second tab 22 via a second adapter 24. Exemplarily, the second tab 22 of the electrode assembly 20 is composed of a plurality of second sub-tabs stacked together, and one end of the second adapter 24 can be welded to the second tab 22, and then the other end of the second adapter 24 can be welded to the second electrode terminal 17.

[0224] In some embodiments, the second electrode terminal 17 includes a third connecting portion 170 and a fourth connecting portion 171 connected to each other. At least a portion of the third connecting portion 170 may be located outside the first wall 110 to connect with an external structural member (e.g., a busbar) to enable current input and output. At least a portion of the fourth connecting portion 171 may be located inside the first wall 110 to connect with an internal structural member of the battery cell 10. Exemplarily, the fourth connecting portion 171 may be connected to the second tab 22 via the second adapter 24, or the fourth connecting portion 171 may be directly connected to the second tab 22. In some embodiments, the connection relationship between the third connecting portion 170 and the fourth connecting portion 171 includes, but is not limited to, welding, snap-fitting, riveting, or threaded connection. Exemplarily, the surface of the fourth connecting portion 171 facing the electrode assembly 20 is welded to the second adapter 24.

[0225] In some embodiments, a third insulating member 19 may be provided between the third connecting portion 170 of the second electrode terminal 17 and the first wall 110 to insulatingly isolate the third connecting portion 170 and the first wall 110. The third insulating member 19 may be a plastic structure or other structures with insulating properties, such as organic insulating materials, inorganic insulating materials, or mixed insulating materials. Exemplarily, in some embodiments of this application, the material of the first protective member 14 may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the first protective member 14 may also be made of other materials with insulating properties such as polypropylene and polyethylene.

[0226] In some embodiments, along the thickness direction z of the first wall, the first insulating member 15, the first wall 110 and the third insulating member 19 are respectively formed with corresponding through holes, which allow the second electrode terminal 17 to pass through.

[0227] The second deformable member 18 is mounted on the first wall 110 and is electrically connected to the first wall 110. In some embodiments, the second deformable member 18 may be made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal. In some embodiments, the second deformable member 18 may be welded to the inner surface of the first wall 110.

[0228] The second deformable member 18 is a structural member that deforms under the internal pressure of the battery cell 10. The second deformable member 18 is used for overcharge protection of the battery cell 10. For example, when the battery cell 10 is under abuse conditions such as overcharging, the internal pressure increases. When the internal pressure reaches a certain level, such as a second threshold, the second deformable member 18 deforms to contact the second electrode terminal 17, thereby connecting the first wall 110 and the second electrode terminal 17, so that the positive and negative electrodes inside the battery cell 10 are short-circuited.

[0229] In some embodiments, the first threshold and the second threshold may be unequal or equal.

[0230] In some embodiments, the portion of the second deformable member 18 that is deformed under pressure to contact the second electrode terminal 17 may be the portion of the second electrode terminal 17 located inside the first wall 110, or the portion of the second electrode terminal 17 located outside the first wall 110. For example, the second deformable member 18 may deform to connect with the fourth connecting portion 171 when the internal pressure of the battery cell 10 reaches the second threshold. Or, for example, the second deformable member 18 may deform to connect with the third connecting portion 170 when the internal pressure of the battery cell 10 reaches the second threshold.

[0231] In some embodiments, the second deformable member 18 may be a flipping piece, which flips under pressure.

[0232] For example, the second deformable member 18 can have a structure similar to that of the first deformable member 13, as shown in Figures 6 and 16. The outer contour of the second deformable member 18 is disc-shaped, and it includes a second skirt, a second flip foil, and a second electrical connection portion connected sequentially from the outside to the inside. The second skirt can be connected to the first wall 110. The second flip foil is relatively thin and is used to deform and flip under pressure. After the second flip foil flips, it can push the second electrical connection portion toward the second electrode terminal 17, thereby making the second electrical connection portion contact the second electrode terminal 17.

[0233] Exemplarily, the first wall 110 has a fourth through hole 1102, and the third insulating member 19 has a fifth through hole 190, with the fourth through hole 1102 and the fifth through hole 190 disposed opposite to each other. A second skirt is welded to the first wall 110, such that the second deformable member 18 closes the fourth through hole 1102. In its natural state, the second flip foil is collapsed in a direction away from the first wall 110. When the internal pressure of the battery cell 10 reaches a second threshold, the second flip foil flips in a direction facing the first wall 110 to push the second electrical connection portion, thereby allowing the second electrical connection portion to pass through the fourth through hole 1102 and the fifth through hole 190 and contact the third connection portion 170.

[0234] 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 18 deforms, short-circuiting the second electrode terminal 17 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 23 and / or a second adapter 24. Exemplarily, the first adapter 23 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.

[0235] In the above scheme, by setting the second deformable member 18, when the internal pressure of the battery cell 10 reaches a certain level, the deformation of the second deformable member 18 allows it to contact the second electrode terminal 17, thereby making the second electrode terminal 17 electrically connected to the second wall. Combined with the short circuit between the first deformable member 13 and the first electrode terminal 12, the electrical connection components inside the battery cell 10 melt due to the large current generated by the short circuit, thus cutting off the charging and discharging circuit of the battery cell 10, thereby playing the role of overcharge protection and reducing the risk of thermal runaway of the battery cell 10, thus making the battery 100 have high reliability. On the other hand, since the first electrode terminal 12 and the second electrode terminal 17 are both insulated from the first wall 110 under non-abuse conditions, the outer shell 11 of the battery cell 10 can be de-energized, which is conducive to the battery cell 10 forming an energy storage device 2000. This reduces the risk of arcing and breakdown between two adjacent battery cells 10 in the energy storage device 2000. At the same time, by setting the second deformable member 18, the overcharge protection can be effectively achieved, making the energy storage device 2000 highly reliable.

[0236] In some embodiments, a second protrusion 1103 protrudes from the outer surface of the first wall 110, and the second protrusion 1103 surrounds the fourth through hole 1102. The second protrusion 1103 surrounds the fourth through hole 1102 to serve to enclose the fourth through hole 1102. In some embodiments, the second protrusion 1103 is annular, surrounding one or more circumferences of the fourth through hole 1102. The second protrusion 1103 may be circular or polygonal.

[0237] By providing the first protrusion 1101, the risk of external fluid entering the battery cell 10 through the fourth through hole 1102 and interfering with the second deformable member 18, thus affecting its deformation, can be effectively reduced. This allows the second deformable member 18 to deform under the internal pressure of the battery cell 10, effectively contacting the first electrode terminal 12. This effectively achieves an internal short circuit in the battery cell 10, causing 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, reduces the risk of thermal runaway in the battery cell 10, and ultimately enhances the reliability of the battery 100. For example, when electrolyte is injected into the battery cell 10, there is a possibility of electrolyte spilling onto the first wall 110. By providing the second protrusion 1103, the risk of electrolyte on the first wall 110 entering the battery cell 10 through the fourth through hole 1102 and interfering with the second deformable member 18, thus causing its failure, can be effectively reduced.

[0238] In some embodiments, the second protrusion 1103 is similar to the first protrusion 1101. Correspondingly, the surface of the third insulating member 19 facing the first wall 110 is formed with a second groove, the second protrusion 1103 is disposed in the second groove, and the second protrusion 1103 and the second groove are in clearance fit.

[0239] Please refer to Figures 8, 10, 11, and 16 for some embodiments of this application. To improve the problem that the second deformable member 18 fails due to the welding of the second electrode terminal 17 to the internal structural components of the battery cell 10, thus failing to conduct electricity between the outer casing 11 and the second electrode terminal 17 of the battery cell 10 and affecting the reliability of the battery 100, the battery cell 10 may also be provided with a second protective member 25. Along the thickness direction z of the first wall, at least a portion of the second protective member 25 is disposed on the side of the second deformable member 18 opposite to the second electrode terminal 17, and the second protective member 25 is configured to at least partially shield the second deformable member 18.

[0240] In some embodiments, the structure of the second protective member 25 may be similar to that of the first protective member 14.

[0241] The second protective member 25 is a structural component disposed inside the battery cell 10. The function of the second protective member 25 includes shielding the second deformable member 18, thereby isolating the second deformable member 18 and the fourth connecting portion 171 from the portion where they are connected to the internal structural components of the battery cell 10. The second protective member 25 can be made of an insulating material, such as organic insulating materials, inorganic insulating materials, or mixed insulating materials. Exemplarily, in some embodiments of this application, the material of the second protective member 25 may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the second protective member 25 may also be made of other materials with insulating properties, such as polypropylene or polyethylene.

[0242] The phrase "at least a portion of the second protective member 25 is disposed on the side of the second deformable member 18 opposite to the second electrode terminal 17 along the thickness direction z of the first wall" can be understood as follows: from the outer side of the first wall 110 to the inner side of the first wall 110, at least a portion of the second protective member 25 extends beyond the second deformable member 18 to be positioned on one side of the second electrode terminal, thereby shielding the second deformable member 18. Exemplarily, the first protective member 14 is plate-shaped and located between the second protective member 25 and the second electrode terminal 17. The second protective member 25 extends from the inner surface of the first wall 110 toward the electrode assembly 20, and its end extends beyond the portion of the second deformable member 18 closest to the electrode assembly 20. Exemplarily, the first protective member 14 is cover-shaped, connected to and covering the inner surface of the first wall 110.

[0243] In some embodiments, as shown in FIG10, the second protective member 25 is a second protective cover, and at least a portion of the second deformable member 18 is located inside the second protective cover.

[0244] In some embodiments, the second protective cover includes a bottom wall and a side wall. Along the thickness direction z of the first wall, the bottom wall of the second protective cover is disposed on the side of the second deformable member opposite to the second electrode terminal, and the side wall of the second protective cover surrounds the bottom wall of the second protective cover.

[0245] In some embodiments, a vent 140 is provided on the bottom wall and / or side wall of the second protective cover. The vent 140 connects the interior and exterior of the second protective cover, so that the pressure inside the battery cell 10 can act on the second deformable member 18 inside the second protective cover. The shape of the vent 140 includes, but is not limited to, square, circular, triangular, or other shapes. The vent 140 does not face the first electrode terminal 12.

[0246] In some embodiments, the orientation of the vent 140 of the second protective cover may be the same as that of the vent 140 of the first protective cover. For example, the orientations of the vents 140 of the first and second protective covers may both be perpendicular to the first direction x.

[0247] In some embodiments, the orientation of the vent 140 of the second protective cover may be parallel to the second direction y.

[0248] In some embodiments, the maximum dimension of the vent 140 of the second protective cover along the first direction x is greater than or equal to 1 mm and less than or equal to 15 mm. For example, the maximum dimension of the vent 140 of the second protective cover along the first direction x can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm...12 mm, 13 mm, 14 mm, 15 mm or any value between two adjacent values. Optionally, the maximum dimension of the vent 140 of the second protective cover along the first direction x is greater than or equal to 5 mm and less than or equal to 10 mm.

[0249] In some embodiments, the maximum dimension of the vent 140 of the second protective cover along the thickness direction z of the first wall is greater than or equal to 1 mm and less than or equal to 5 mm. For example, the maximum dimension of the vent 140 of the second protective cover along the first direction x can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or any value between two adjacent values. Optionally, the maximum dimension of the vent 140 of the second protective cover along the first direction x is greater than or equal to 2 mm and less than or equal to 4 mm.

[0250] In some embodiments, the second protective member 25 is integrally formed with the first insulating member 15. For example, the second protective member 25 and the first insulating member 15 are made of the same material, both being plastic structures, and are manufactured by plastic molding.

[0251] In some embodiments, the first protective member 14, the second protective member 25 and the first insulating member 15 are integrally formed. For example, the first protective member 14, the second protective member 25 and the first insulating member 15 are made of the same material, which is plastic structure. The first protective member 14, the second protective member 25 and the first insulating member 15 are made by plastic molding.

[0252] According to some embodiments of this application, please refer to FIG5, the first electrode terminal 12 and the second electrode terminal 17 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 electrode terminal 12 opposite to the second electrode terminal 17, and / or, the second deformable member 18 is located on the side of the second electrode terminal 17 opposite to the first electrode terminal 12.

[0253] In some embodiments, along the first direction x, the first deformable member 13, the first electrode terminal 12, the second electrode terminal 17, and the second deformable member 18 are arranged at intervals, that is, the first deformable member 13 and the second deformable member 18 are located outside the two electrode terminals with opposite polarities, and the two electrode terminals with opposite polarities are located between the first deformable member 13 and the second deformable member 18.

[0254] In some embodiments, along the first direction x, the first electrode terminal 12, the first deformable member 13, the second electrode terminal 17, and the second deformable member 18 are arranged at intervals. In some other embodiments, along the first direction x, the first deformable member 13, the first electrode terminal 12, the second deformable member 18, and the second electrode terminal 17 are arranged at intervals. In some other embodiments, along the first direction x, the first electrode terminal 12, the first deformable member 13, the second electrode terminal 17, and the second deformable member 18 are arranged at intervals.

[0255] In the above scheme, with the electrode terminals on the outside of the deformable parts, by setting the first deformable part 13 to be set away from the side of the second electrode terminal 17, and / or setting the second deformable part 18 to be set away from the side of the first electrode terminal 12, 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 100 can be improved.

[0256] 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.

[0257] 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.

[0258] According to some embodiments of this application, an energy storage device 2000 is also provided, which includes the battery cell 10 described above.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] According to some embodiments of this application, please refer to Figures 4-16. 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 17, a second deformable member 18, a first insulating member 15, a second insulating member 16, and a third insulating member 19.

[0263] The housing 11 includes a housing 111 and an end cap. The housing 111 has a receiving cavity inside for accommodating the electrode assembly 20. The housing 111 has an opening communicating with the receiving cavity. The end cap closes the opening of the housing 111, so that the electrode assembly 20 is in a closed space.

[0264] Along the first direction x, the first deformable part 13, the first electrode terminal 12, the second electrode terminal 17, and the second deformable part 18 are arranged and installed on the end cover in sequence.

[0265] The first electrode terminal 12 includes a first connecting portion 120 located on the outer side of the end cap and a second connecting portion 121 located at least partially on the inner side of the end cap. The first connecting portion 120 is used for electrical connection with an external component, and the second connecting portion 121 is electrically connected to the first tab 21 of the electrode assembly 20 via a first adapter 23. At least a portion of the second insulating member 16 is disposed between the first connecting portion 120 and the end cap.

[0266] The second electrode terminal 17 includes a third connecting portion 170 located on the outer side of the end cap and a fourth connecting portion 171 located at least partially on the inner side of the end cap. The third connecting portion 170 is used for electrical connection with an external component, and the fourth connecting portion 171 is electrically connected to the second tab 22 of the electrode assembly 20 via a second adapter 24. At least a portion of the third insulating member 19 is disposed between the third connecting portion 170 and the end cap.

[0267] The end cap has a second through hole 1100. The first deformable part 13 is a flip-up piece, which is welded to the inner surface of the end cap and closes the second through hole 1100. When the internal pressure of the battery cell 10 reaches a certain level, the first deformable part 13 deforms to pass through the second through hole 1100 and contact the first connecting part 120. The end cap has a fourth through hole 1102, and the second deformable part 18 is welded to the inner surface of the end cap and closes the fourth through hole 1102. When the internal pressure of the battery cell 10 reaches a certain level, the second deformable part 18 deforms to pass through the fourth through hole 1102 and contact the third connecting part 170.

[0268] In some embodiments, a first protrusion 1101 is provided on the outer surface of the end cap, the first protrusion 1101 is disposed around the second through hole 1100, and the second insulating member 16 is provided with a first groove 161 corresponding to the first protrusion 1101, the first protrusion 1101 and the first groove 161 are in clearance fit. By providing the first protrusion 1101, the risk of external fluid entering the battery cell 10 through the second through hole 1100 and interfering with the first deformable member 13, thus affecting the deformation of the first deformable member 13, can be effectively reduced.

[0269] In some embodiments, a second protrusion 1103 is provided on the outer surface of the end cap, the second protrusion 1103 is disposed around the fourth through hole 1102, and the third insulating member 19 is provided with a second groove corresponding to the second protrusion 1103, the second protrusion 1103 and the second groove are in clearance fit. By providing the second protrusion 1103, the risk of external fluid entering the battery cell 10 through the fourth through hole 1102 and interfering with the second deformable member 18, thus affecting the deformation of the second deformable member 18, can be effectively reduced.

[0270] The first insulating element 15 is disposed on the inner surface of the end cap, and the first insulating element 15 is used to insulate and isolate the end cap and the electrode assembly 20.

[0271] In some embodiments, the first insulating member 15 is provided with a first protective member 14 and a second protective member 25. The first protective member 14 is a first protective cover, and at least a portion of the first deformable member 13 is covered by the first protective cover. During the manufacturing process of the battery cell 10, the first protective member 14 protects the first deformable member 13, reducing the impact of welding the first electrode terminal 12 to the internal structural components of the battery cell 10 on the first deformable member 13. For example, it reduces the risk of welding slag splashing onto the first deformable member 13 during welding, causing the first deformable member 13 to fail. This allows the first deformable member 13 to deform under abuse conditions such as overcharging of the battery cell 10 to effectively contact the first electrode terminal 12, achieving overcharge protection and thus improving the reliability of the battery 100.

[0272] In some embodiments, the first protective cover has a vent 140 that connects the interior and exterior of the first protective cover. This allows the internal pressure of the battery cell 10 to effectively act on the first deformable member 13 through the vent, causing the first deformable member 13 to deform and connect the end cap and the first electrode terminal 12, thus providing overcharge protection. The vent 140 is oriented parallel to the second direction y. The first direction x, the second direction y, and the thickness direction z of the first wall are perpendicular to each other.

[0273] In some embodiments, the second protective member 25 is a second protective cover, and at least a portion of the second deformable member 18 is covered within the second protective cover. During the manufacturing process of the battery cell 10, the second protective member 25 protects the second deformable member 18, reducing the impact of welding the second electrode terminal 17 to the internal structural components of the battery cell 10 on the second deformable member 18. For example, it reduces the risk of weld spatter splashing onto the second deformable member 18 during welding, causing the second deformable member 18 to fail. This allows the second deformable member 18 to deform under abuse conditions such as overcharging of the battery cell 10 to effectively contact the second electrode terminal 17, achieving overcharge protection and improving the reliability of the battery 100. In some embodiments, the second protective cover has a vent 140 that connects the inside and outside of the second protective cover, so that the internal pressure of the battery cell 10 can effectively act on the second deformable member 18 through the vent, thereby causing the second deformable member 18 to deform to conduct the end cap and the second electrode terminal 17, thus achieving overcharge protection.

[0274] In some embodiments, the orientation of the vent 140 is parallel to the second direction y.

[0275] 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, The battery cell comprises: a housing having a first wall; a first electrode terminal disposed on the first wall; a first deformation member electrically connected to the first wall, the first deformation member being configured to be deformable to contact the first electrode terminal to electrically connect the first electrode terminal to the first wall; a first protection member disposed on a side of the first deformation member facing away from the first electrode terminal along a thickness direction of the first wall, the first protection member being configured to at least partially shield the first deformation member.

2. The battery cell according to claim 1, wherein the first protection member is made of an insulating material.

3. The battery cell according to claim 1 or 2, wherein the first protection member is a first protection cover, and at least a portion of the first deformation member is located in the first protection cover.

4. The battery cell according to claim 3, wherein the first protection cover is provided with a vent opening, and the vent opening communicates an inside of the first protection cover with an outside of the first protection cover.

5. The battery cell according to claim 4, wherein the vent opening is not directed toward the first electrode terminal.

6. The battery cell according to claim 4, wherein the first deformation member and the first electrode terminal are arranged along a first direction, and a direction in which the vent opening is directed is perpendicular to the first direction.

7. The battery cell according to any one of claims 4-6, wherein the first protection cover comprises a bottom wall and a side wall, the bottom wall is disposed on a side of the first deformation member facing away from the first electrode terminal along a thickness direction of the first wall, the side wall is disposed around the bottom wall, and the vent opening is disposed on the side wall and / or the bottom wall.

8. The battery cell according to claim 7, wherein the side wall comprises a first sub-side wall and two second sub-side walls; along a first direction, the first sub-side wall is located between the first deformation member and the first electrode terminal; along a second direction, the two second sub-side walls are spaced apart, the first deformation member is located between the two second sub-side walls, and the vent opening is disposed on the second sub-side wall; the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other.

9. The battery cell according to claim 8, wherein along the first direction, a maximum dimension of the vent opening is greater than or equal to 1 mm and less than or equal to 15 mm.

10. The battery cell according to claim 9, wherein along the first direction, the maximum dimension of the vent opening is greater than or equal to 5 mm and less than or equal to 10 mm.

11. The battery cell according to any one of claims 8-10, wherein along the thickness direction of the first wall, the maximum dimension of the vent opening is greater than or equal to 1 mm and less than or equal to 5 mm.

12. The battery cell according to claim 11, wherein along the thickness direction of the first wall, the maximum dimension of the vent opening is greater than or equal to 2 mm and less than or equal to 4 mm.

13. The battery cell according to any one of claims 1-12, wherein The battery cell further comprises a first insulation member disposed on an inner surface of the first wall, the first insulation member being configured to insulate the first wall and the electrode assembly, the first insulation member being provided with a first through hole, the first electrode terminal being disposed through the first through hole; and the first protection member is connected with the first insulation member. 14.The battery cell of claim 13, wherein The first protection member is integrally formed with the first insulation member. 15.The battery cell of claim 13 or 14, wherein The first protection member is disposed adjacent to the first through hole. 16.The battery cell of any one of claims 1-15, wherein The first electrode terminal comprises a first connecting portion, the first connecting portion being located on an outer side of the first wall; The battery cell further comprises a second insulation member, at least a portion of the second insulation member being located between the first wall and the first connecting portion along a thickness direction of the first wall. 17.The battery cell of claim 16, wherein The first wall is provided with a second through hole, the second insulation member is provided with a third through hole, the first deformation member is configured to close the second through hole, and the second through hole and the third through hole are oppositely disposed along the thickness direction of the first wall. 18.The battery cell of claim 17, wherein An outer surface of the first wall is provided with a first protrusion, the first protrusion being disposed around the second through hole. 19.The battery cell of claim 18, wherein A surface of the second insulation member facing the first wall is formed with a first groove, and the first protrusion is disposed in the first groove. 20.The battery cell of claim 19, wherein The first protrusion is in clearance fit with the first groove. 21.The battery cell of any one of claims 18-20, wherein An inner circumferential surface of the first protrusion is flush with a hole wall of the second through hole. 22.The battery cell of any one of claims 1-21, wherein The battery cell further comprises: a second electrode terminal disposed on the first wall; a second deformation member, the second deformation member being electrically connected with the first wall, the second deformation member being configured to be deformable to contact the second electrode terminal to electrically connect the second electrode terminal with the first wall. 23.The battery cell of claim 22, wherein The first electrode terminal and the second electrode terminal are spaced apart along a first direction; Along the first direction, the first deformation member is located on a side of the first electrode terminal facing away from the second electrode terminal, and / or the second deformation member is located on a side of the second electrode terminal facing away from the first electrode terminal.

24. A battery, wherein, A battery cell according to any one of claims 1-23.

25. An energy storage device, wherein, A battery cell according to any one of claims 1-23.

26. An electrical device, comprising: A battery cell according to any one of claims 1-23, the battery cell being configured to provide electrical energy.

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