Battery cells, batteries and electrical equipment

Abstract

Embodiments of the present application provide a battery cell, a battery, and an electrical device. The battery cell includes: a housing including a first wall; a pressure relief mechanism disposed on the first wall; an electrode lead portion disposed on the housing; an electrode assembly disposed within the housing, the electrode assembly being provided with a tab; and an adapter, at least a portion of which is disposed between the tab and the first wall, the electrode lead portion and the tab being electrically connected via the adapter. The adapter's projection on the first wall, along the thickness direction of the first wall, does not overlap with at least a portion of the pressure relief mechanism. This battery cell has a high level of safety.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In the development of battery technology, in addition to improving the energy density of batteries, safety is also an issue that cannot be ignored. Therefore, how to improve battery safety is a technical problem that needs to be solved urgently in battery technology. Summary of the Invention

[0004] The purpose of the present application is to provide a battery cell, a battery and an electrical device. The battery cell has high safety.

[0005] This application is achieved through the following technical solutions:

[0006] In the first aspect, the present application provides a battery cell, comprising: a shell, comprising a first wall; a pressure relief mechanism, arranged on the first wall; an electrode lead-out portion, arranged on the shell; an electrode assembly, arranged in the shell, the electrode assembly being provided with a tab; an adapter, at least part of which is arranged between the tab and the first wall, the electrode lead-out portion and the tab being electrically connected through the adapter; wherein, along the thickness direction of the first wall, the projection of the adapter on the first wall does not overlap with at least a portion of the pressure relief mechanism.

[0007] According to the battery cell of the embodiment of the present application, the projection of the adapter on the first wall does not overlap with at least a portion of the pressure relief mechanism. When thermal runaway occurs in the battery cell, the risk of the adapter blocking or clogging the pressure relief mechanism can be reduced, so that the pressure relief mechanism can release pressure, and the battery cell has higher safety.

[0008] According to some embodiments of the present application, the adapter includes a first connecting part and a second connecting part, the first connecting part is connected to the electrode lead-out part, the second connecting part is connected to the electrode ear, and the second connecting part is formed with a first air avoidance part, and along the thickness direction, the projection of the pressure relief mechanism on the second connecting part at least partially falls into the first air avoidance part.

[0009] In the above solution, the first avoidance portion is the hollowed-out portion of the second connecting portion. Since the projection of the pressure relief mechanism on the second connecting portion at least partially falls into the first avoidance portion, when thermal runaway occurs in the battery cell, the first avoidance portion can reduce the risk of the adapter blocking or clogging the pressure relief mechanism, thereby facilitating pressure relief by the pressure relief mechanism.

[0010] According to some embodiments of the present application, along the thickness direction, the projection of the pressure relief mechanism on the second connecting portion all falls into the first air avoidance portion, the area of ​​the first air avoidance portion is S1, and the area of ​​the pressure relief mechanism is S2, satisfying S1≥S2.

[0011] In the above solution, the projection of the pressure relief mechanism on the second connecting part all falls into the first avoidance part, and the area of ​​the first avoidance part is greater than or equal to the area of ​​the pressure relief mechanism. This can effectively reduce the risk of the adapter blocking the pressure relief mechanism when the battery cell thermal runaways, and ensure that the pressure relief mechanism releases pressure in time.

[0012] According to some embodiments of the present application, the area of ​​the first air-avoiding portion is S1, and the area of ​​the second connecting portion is S3, which satisfies 0<S1 / S3≤0.75.

[0013] In the above scheme, the ratio of the area of ​​the first air avoidance portion to the area of ​​the second connection portion satisfies the above relationship. On the one hand, it can ensure that the first air avoidance portion and the pressure relief mechanism have a larger overlapping area, reduce the obstruction of the gas inside the battery cell, and facilitate the smooth flow of gas toward the pressure relief mechanism. On the other hand, it can ensure that the second connection portion and the tab have a larger connection area to facilitate current transmission.

[0014] According to some embodiments of the present application, the first avoiding portion is a notch provided on the edge of the second connecting portion.

[0015] In the above solution, the first air-avoiding portion is a notch, which has a simple structure and is easy to process. At the same time, it facilitates the flow of gas toward the pressure relief mechanism.

[0016] According to some embodiments of the present application, the adapter also includes a third connecting part, which connects the first connecting part and the second connecting part, and the first air avoidance part is located at an end of the second connecting part away from the connection part between the second connecting part and the third connecting part.

[0017] In the above solution, the first avoidance portion is located at an end of the second connection portion away from the connection portion between the second connection portion and the third connection portion, so as to facilitate the processing of the first avoidance portion and reduce the shielding of the first avoidance portion by the third connection portion.

[0018] According to some embodiments of the present application, the first space-avoiding portion has a first edge and a second edge, and the first edge and the second edge are arranged at an angle, or the edge of the first space-avoiding portion is arc-shaped.

[0019] In the above scheme, when the first edge and the second edge are set at an angle, the first air avoidance portion has a larger area, which can facilitate the gas to pass through the first air avoidance portion and ensure that the gas flows smoothly toward the pressure relief mechanism; the edge of the first air avoidance portion is arc-shaped, which is convenient for processing. At the same time, the size of the first air avoidance portion on the second connecting portion can be designed to be smaller to ensure that the second connecting portion and the electrode ear have a larger connection area.

[0020] According to some embodiments of the present application, the second connecting portion includes a main body area and two connecting areas, the two connecting areas are connected to the tab, and the first air avoidance portion is located between the two connecting areas.

[0021] In the above solution, the first avoidance portion is located between the two connection areas to ensure a stable connection between the second connection portion and the tab.

[0022] According to some embodiments of the present application, the tab is formed with a second avoidance portion, and along the thickness direction, the projection of the second avoidance portion on the first wall and the projection of the first avoidance portion on the first wall at least partially overlap with the pressure relief mechanism.

[0023] In the above solution, the projection of the second air avoidance portion on the first wall and the projection of the first air avoidance portion on the first wall at least partially overlap with the pressure relief mechanism, so that the gas inside the battery cell flows smoothly toward the pressure relief mechanism, reducing the risk of the pressure relief mechanism being blocked.

[0024] According to some embodiments of the present application, along the thickness direction, the projection of the first gap portion on the electrode assembly falls entirely into the second gap portion, the area of ​​the second gap portion is S4, and the area of ​​the first gap portion is S1, satisfying S4≥S1.

[0025] In the above scheme, the projection of the first air avoidance portion on the electrode assembly falls entirely into the second air avoidance portion, and the area of ​​the second air avoidance portion is greater than or equal to the area of ​​the first air avoidance portion, which can reduce the risk of the tab blocking the first air avoidance portion and facilitate the gas inside the battery cell to pass through the first air avoidance portion to flow toward the pressure relief mechanism, ensuring smooth gas flow.

[0026] According to some embodiments of the present application, a profile of the second space-avoiding portion matches a profile of the first space-avoiding portion.

[0027] In the above solution, the contour of the second gap portion matches the contour of the first gap portion, which not only ensures that the risk of the first gap portion being blocked by the tab is small, but also ensures that the tab and the second connecting portion have a larger connection area.

[0028] According to some embodiments of the present application, the electrode tab is formed at one end of the electrode assembly close to the first wall, and the electrode lead-out portion is provided on the first wall.

[0029] In the above solution, the tab is formed at one end of the electrode assembly close to the first wall, and the electrode lead-out portion is provided on the first wall, so that the structure of the battery cell is compact and the battery cell has a high energy density.

[0030] In a second aspect, the present application provides a battery, comprising a housing and a plurality of battery cells as provided in the above embodiments, wherein the plurality of battery cells are disposed in the housing.

[0031] In a third aspect, the present application provides an electrical device comprising a battery cell as provided in the above embodiment.

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0034] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0035] Figure 2 An exploded view of a battery provided in accordance with some embodiments of the present application;

[0036] Figure 3 An exploded view of a battery cell provided in some embodiments of the present application;

[0037] Figure 4 A cross-sectional view of a battery cell provided in some embodiments of the present application;

[0038] Figure 5 A schematic diagram of the assembly of the adapter and the first wall provided in some embodiments of the present application;

[0039] Figure 6 Schematic diagram of assembly of the adapter and the first wall provided in other embodiments of the present application;

[0040] Figure 7 A schematic structural diagram of an adapter provided in some embodiments of the present application;

[0041] Figure 8Schematic diagram of assembly of the adapter and the first wall provided in some other embodiments of the present application;

[0042] Figure 9 A schematic structural diagram of an adapter provided in some other embodiments of the present application;

[0043] Figure 10 A top view of a battery cell provided in some embodiments of the present application;

[0044] In the drawings, the drawings are not drawn to scale.

[0045] Marking instructions: 100-battery; 101-casing; 1011-first part; 1012-second part; 10-battery cell; 11-shell; 111-shell; 112-cover; 113-first wall; 12-pressure relief mechanism; 13-electrode lead-out portion; 14-electrode assembly; 141-main body; 142-ear; 1421-second airtight portion; 15-adapter; 151-first connecting portion; 152-second connecting portion; 1521-first airtight portion; 1521a-first edge; 1521b-second edge; 1522-main body area; 1523-connecting area; 153-third connecting portion; 161-first insulating member; 162-second insulating member; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0048] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0050] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0051] The term "plurality" used in this application refers to two or more (including two).

[0052] In the present application, the battery cells 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 the present application are not limited to this.

[0053] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module. A battery generally includes a housing that encloses one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0054] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector 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. To ensure high current flow without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0055] The battery cell also includes a shell, electrode terminals and an adapter. The electrode terminals are arranged in the shell, the electrode assembly and the electrolyte are arranged in the shell, the adapter connects the electrode tabs and the electrode terminals of the electrode assembly, and an insulating part is usually provided between the adapter and the shell to insulate and isolate the adapter and the shell.

[0056] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery safety must also be considered.

[0057] A pressure relief mechanism is an element or component that activates to release the internal pressure or temperature of a battery cell when the internal pressure or temperature reaches a threshold. This mechanism can take the form of, for example, an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically employ pressure- or temperature-sensitive elements or structures. Specifically, when the internal pressure or temperature of a battery cell reaches a predetermined threshold, the pressure relief mechanism activates or a weakened structure within the mechanism is destroyed, thereby creating an opening or channel through which the internal pressure or temperature can be released.

[0058] "Actuation" as used in this application refers to the action or activation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure or temperature of the battery cell. The action of the pressure relief mechanism may include, but is not limited to, rupturing, breaking, tearing, or opening at least a portion of the pressure relief mechanism. In this way, pressure or temperature relief can be achieved within the battery cell under controlled pressure or temperature, thereby avoiding potentially more serious accidents.

[0059] The pressure relief mechanism on a battery cell has a significant impact on battery safety. For example, short circuits or overcharging can cause thermal runaway within the cell, leading to a sudden increase in pressure or temperature. In these situations, the pressure relief mechanism activates to release internal pressure and temperature, preventing explosion or fire.

[0060] In the prior art, even with a pressure relief mechanism, battery cells are still prone to explosion and fire. The inventors discovered that the cause of this problem is that, because the melting point of the insulating member is lower than that of the adapter, when a battery cell experiences thermal runaway, the insulating member between the adapter and the housing melts, triggering the pressure relief mechanism to vent. During venting, the adapter is easily deformed by the airflow, obstructing the pressure relief mechanism and blocking the venting area of ​​the battery cell. This prevents the release of internal pressure in the battery cell, leading to explosion and fire.

[0061] In view of this, in order to solve the problem that the adapter deforms and blocks the pressure relief mechanism when the battery cell goes into thermal runaway, resulting in poor safety of the battery cell, the inventors have designed a battery cell after in-depth research. A pressure relief mechanism is provided on the first wall of the outer shell. Along the thickness direction of the first wall, the projection of the adapter on the first wall does not overlap with at least a part of the pressure relief mechanism. This reduces the risk of the adapter blocking the pressure relief mechanism when the battery cell goes into thermal runaway, thereby making the battery cell safer.

[0062] In such a battery cell, the projection of the adapter on the first wall does not overlap with at least a portion of the pressure relief mechanism. Even if the adapter is deformed when the battery cell thermally runs away, the area where the adapter blocks the pressure relief mechanism is small or even does not block the pressure relief mechanism, so that the pressure relief mechanism can release pressure easily, thereby improving the safety of the battery cell.

[0063] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical equipment.

[0064] The embodiments of the present application provide an electrical device that uses a battery as a power source. The electrical device may be, but is not limited to, a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The spacecraft includes airplanes, rockets, space shuttles, and spacecraft. The electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. The electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0065] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0066] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery 100 is disposed within the vehicle 1000, and the battery 100 can 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, as the operating power source of the vehicle 1000.

[0067] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0068] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0069] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 101 and a plurality of battery cells 10 , wherein the plurality of battery cells 10 are disposed in the housing 101 .

[0070] The housing 101 is a component that houses the battery cells 10, providing a storage space for the battery cells 10. The housing 101 can have various structures. In some embodiments, the housing 101 can include a first portion 1011 and a second portion 1012, which overlap to define a storage space for the battery cells 10. The first portion 1011 and the second portion 1012 can have various shapes, such as a rectangular parallelepiped or a cylinder. The first portion 1011 can be a hollow structure with one side open, and the second portion 1012 can also be a hollow structure with one side open. The open side of the second portion 1012 overlaps the open side of the first portion 1011, thereby forming the housing 101 with a storage space. Alternatively, the first portion 1011 can be a hollow structure with one side open, and the second portion 1012 can be a plate-like structure. The second portion 1012 overlaps the open side of the first portion 1011, thereby forming the housing 101 with a storage space. The first portion 1011 and the second portion 1012 can be sealed by a sealing element, which can be a sealing ring, sealant, etc.

[0071] In the battery 100, multiple battery cells 10 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. Multiple battery cells 10 can be connected in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a whole and housed within the housing 101. Alternatively, all battery cells 10 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole battery module is housed within the housing 101.

[0072] In some embodiments, the battery 100 may further include a busbar component, through which the multiple battery cells 10 can be electrically connected to each other, thereby enabling series connection, parallel connection, or hybrid connection of the multiple battery cells 10. The busbar component may be a metal conductor, such as copper, iron, aluminum, stainless steel, or an aluminum alloy.

[0073] Please refer to Figure 3 and Figure 4 , Figure 3 An exploded view of a battery cell 10 provided in some embodiments of the present application is shown. Figure 4 This is a cross-sectional view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 may include a housing 11 , a pressure relief mechanism 12 , an electrode lead-out portion 13 , an electrode assembly 14 , and an adapter 15 .

[0074] The housing 11 is a component for accommodating the electrode assembly 14. The housing 11 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc. The housing 11 can include a shell 111 and a cover 112. The cover 112 covers the opening of the shell 111, and the cover 112 and the shell 111 together define a sealed space.

[0075] The housing 111 may be a hollow structure with an opening at one end, or a hollow structure with openings at two opposite ends. The housing 111 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0076] The cover 112 is a component that closes the opening of the shell 111 to isolate the internal environment of the battery cell 10 from the external environment. The cover 112 and the shell 111 together define a sealed space for accommodating the electrode assembly 14, electrolyte and other components. The cover 112 can be connected to the shell 111 by welding or rolling to close the opening of the shell 111. The shape of the cover 112 can be adapted to the shape of the shell 111. For example, the shell 111 is a rectangular parallelepiped structure, and the cover 112 is a rectangular plate structure adapted to the shell 111. For another example, the shell 111 is a cylinder, and the cover 112 is a circular plate structure adapted to the shell 111. The material of the cover 112 can also be various, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0077] In the battery cell 10, there can be one or two covers 112. In an embodiment where the housing 111 is a hollow structure with openings at both ends, two covers 112 can be provided. The two covers 112 respectively close the two openings of the housing 111, and the two covers 112 and the housing 111 together define a sealed space. In an embodiment where the housing 111 is a hollow structure with an opening at one end, there can be one cover 112 provided. The cover 112 closes the opening at one end of the housing 111, and the cover 112 and the housing 111 together define a sealed space.

[0078] The electrode assembly 14 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 14 may include a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly 14 may be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet. The electrode assembly 14 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The separator is used to separate the positive electrode sheet and the negative electrode sheet to prevent internal short circuits between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body 141, and the portions of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab 142. The positive tab and the negative tab may extend from one end of the main body 141, or the positive tab and the negative tab may extend from two opposite ends of the main body 141.

[0079] The pressure relief mechanism 12 is an element or component that is activated to release the internal pressure or temperature of the battery cell 10 when the internal pressure or temperature reaches a threshold value. Figure 3As shown, the pressure relief mechanism 12 can be provided on the cover 112. In other embodiments, the pressure relief mechanism 12 can also be provided on the housing 111.

[0080] The electrode lead-out portion 13 is a component for leading out the electric energy of the battery cell 10 and is used to electrically connect to the adjacent battery cell 10 or other conductive components. The electrode lead-out portion 13 can be a wall of the housing 11. Figure 3 As shown, the electrode lead portion 13 may also be an electrode terminal provided on the cover 112. In other embodiments, the electrode lead portion 13 may also be provided on the housing 111. Figure 4 As shown, a first insulating member 161 is provided between the electrode lead portion 13 and the housing 11 to insulate and isolate the electrode lead portion 13 from the housing 11 .

[0081] The adapter 15 is a component that realizes the electrical connection between the electrode lead portion 13 and the tab 142. Figure 4 As shown, a second insulating member 162 is provided between the adapter 15 and the housing 11 to insulate and isolate the adapter 15 from the housing 11. When the battery cell 10 thermally runs away, the internal temperature of the battery cell 10 exceeds the melting point of the second insulating member 162, and the second insulating member 162 melts.

[0082] See Figure 4 , and see further Figure 5 and Figure 6 , Figure 5 Schematic diagram of the assembly of the adapter 15 and the first wall 113 provided in some embodiments of the present application, Figure 6 Schematic diagram of the assembly of the adapter 15 and the first wall 113 provided in some other embodiments of the present application, Figure 5 and Figure 6 It is a schematic diagram from the inner side to the outer side of the first wall 113 along the thickness direction Z of the first wall 113. According to some embodiments of the present application, the present application provides a battery cell 10, which includes a shell 11, a pressure relief mechanism 12, an electrode lead-out portion 13, an electrode assembly 14 and an adapter 15. The shell 11 includes a first wall 113, and the pressure relief mechanism 12 is arranged on the first wall 113. The electrode lead-out portion 13 is arranged in the shell 11. The electrode assembly 14 is arranged in the shell 11, and the electrode assembly 14 is provided with a tab 142. At least part of the adapter 15 is arranged between the tab 142 and the first wall 113, and the electrode lead-out portion 13 and the tab 142 are electrically connected through the adapter 15. Wherein, along the thickness direction of the first wall 113, the projection of the adapter 15 on the first wall 113 does not overlap with at least a part of the pressure relief mechanism 12.

[0083] In the figure, the direction indicated by letter Z is the thickness direction of the first wall 113 .

[0084] The electrode assembly 14 includes a main body 141 and tabs 142 extending from the main body 141. The tabs 142 may extend from both sides of the main body 141 or from one side of the main body 141.

[0085] The electrode lead portion 13 may be disposed on the first wall 113 or in other areas of the housing 11 .

[0086] “At least a portion of the adapter 15 is disposed between the electrode tab 142 and the first wall 113” means that a portion of the adapter 15 is disposed between the electrode tab 142 and the first wall 113, or the adapter piece is entirely disposed between the electrode tab 142 and the first wall 113. For example, in an embodiment where the electrode lead portion 13 is disposed on the first wall 113, when the direction in which the electrode tab 142 extends from the main body 141 is parallel to the thickness direction Z of the first wall 113, the adapter 15 is entirely located between the electrode assembly 14 and the first wall 113 along the thickness direction Z of the first wall 113; when the direction in which the electrode tab 142 extends from the main body 141 is perpendicular to the thickness direction Z of the first wall 113, one end of the adapter 15 is connected to the electrode tab 142, and along the thickness direction Z of the first wall 113, this portion of the adapter 15 is located between the electrode assembly 14 and the first wall 113.

[0087] “The projection of the adapter 15 on the first wall 113 does not overlap with at least a portion of the pressure relief mechanism 12” means that Figure 5 As shown, the projection of the adapter 15 on the first wall 113 overlaps with a portion of the pressure relief mechanism 12 and does not overlap with another portion of the pressure relief mechanism 12. In other words, the adapter 15 partially blocks the pressure relief mechanism 12; or Figure 6 As shown, the projection of the adapter 15 on the first wall 113 does not overlap with the pressure relief mechanism 12 at all. In other words, the adapter 15 does not block the pressure relief mechanism 12 .

[0088] According to the battery cell 10 of the embodiment of the present application, along the thickness direction Z of the first wall 113, the projection of the adapter 15 on the first wall 113 does not overlap with at least a portion of the pressure relief mechanism 12. When thermal runaway occurs in the battery cell 10, the pressure relief mechanism 12 is actuated, and the risk of the adapter 15 blocking or clogging the pressure relief mechanism 12 is low, so that the pressure relief mechanism 12 can release the internal pressure of the battery cell 10, thereby improving the safety of the battery cell 10.

[0089] See Figure 4 , and see further Figure 7 , Figure 7 This is a schematic diagram of the structure of the adapter 15 provided in some embodiments of the present application. Figure 7According to some embodiments of the present application, the adapter 15 includes a first connecting portion 151 and a second connecting portion 152. The first connecting portion 151 is connected to the electrode lead portion 13, and the second connecting portion 152 is connected to the electrode tab 142. The second connecting portion 152 is formed with a first gap 1521. Along the thickness direction Z, the projection of the pressure relief mechanism 12 on the second connecting portion 152 at least partially falls into the first gap 1521.

[0090] The first connection portion 151 is a portion of the adapter 15 for electrically connecting to the electrode lead portion 13 . For example, the first connection portion 151 and the electrode lead portion 13 may be welded, or the first connection portion 151 and the electrode lead portion 13 may be connected by a conductive adhesive.

[0091] The second connecting portion 152 is a portion of the adapter 15 for electrically connecting to the tab 142 . For example, the second connecting portion 152 and the tab 142 may be welded.

[0092] In some embodiments, as Figure 7 As shown, the first connection portion 151 and the second connection portion 152 may be two ends of the adapter 15 in the length direction X, so as to realize electrical connection between the electrode lead portion 13 and the tab 142 through the adapter 15 .

[0093] The first avoidance portion 1521 is a hollowed-out portion of the second connection portion 152 . The first avoidance portion 1521 penetrates the second connection portion 152 along the thickness direction Z of the first wall 113 , and has the function of avoiding air. Gas can pass through the second connection portion 152 from the first avoidance portion 1521 .

[0094] “Along the thickness direction Z, the projection of the pressure relief mechanism 12 on the second connecting portion 152 at least partially falls into the first space avoidance portion 1521” may include two situations. One is that the projection of the pressure relief mechanism 12 on the second connecting portion 152 partially falls into the first space avoidance portion 1521, that is, the projection of the pressure relief mechanism 12 partially overlaps with the first space avoidance portion 1521; the other is that the projection of the pressure relief mechanism 12 on the second connecting portion 152 completely falls into the first space avoidance portion 1521. At this time, the pressure relief mechanism 12 and the first space avoidance portion 1521 have the largest overlapping area.

[0095] In the above scheme, the first avoidance portion 1521 is a hollowed-out portion of the second connecting portion 152. Since the projection of the pressure relief mechanism 12 on the second connecting portion 152 at least partially falls into the first avoidance portion 1521, when thermal runaway occurs in the battery cell 10, the first avoidance portion 1521 can reduce the risk of the adapter 15 blocking or clogging the pressure relief mechanism 12, so as to facilitate pressure relief of the pressure relief mechanism 12.

[0096] See Figure 6 , and see further Figure 8 , Figure 8Schematic diagram of the assembly of the adapter 15 and the first wall 113 according to some embodiments of the present application. According to some embodiments of the present application, along the thickness direction Z, the projection of the pressure relief mechanism 12 on the second connecting portion 152 falls entirely within the first clearance portion 1521. The area of ​​the first clearance portion 1521 is S1, and the area of ​​the pressure relief mechanism 12 is S2, satisfying S1 ≥ S2.

[0097] The area S1 of the first space portion 1521 refers to the area of ​​the first space portion 1521 on a plane perpendicular to the thickness direction Z.

[0098] The area S2 of the pressure relief mechanism 12 refers to the projected area of ​​the pressure relief mechanism 12 on the electrode assembly 14 along the thickness direction Z. Alternatively, when the first wall 113 is provided with a mounting hole for mounting the pressure relief mechanism 12, the area of ​​the pressure relief mechanism 12 may be the area of ​​the mounting hole.

[0099] In the above solution, the projection of the pressure relief mechanism 12 on the second connecting portion 152 all falls into the first avoidance portion 1521, and the area S1 of the first avoidance portion 1521 is greater than or equal to the area S2 of the pressure relief mechanism 12. This can effectively reduce the risk of the adapter 15 blocking the pressure relief mechanism 12 when the battery cell 10 thermally runs away, thereby ensuring that the pressure relief mechanism 12 releases pressure in a timely manner.

[0100] According to some embodiments of the present application, the area of ​​the first avoiding portion 1521 is S1, and the area of ​​the second connecting portion 152 is S3, satisfying 0<S1 / S3≤0.75.

[0101] The area S3 of the second connection portion 152 is the area of ​​the second connection portion 152 on a plane perpendicular to the thickness direction Z.

[0102] Optionally, S1 / S3=0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, etc.

[0103] In the above solution, the ratio of the area S1 of the first avoidance portion 1521 to the area S3 of the second connection portion 152 satisfies the aforementioned relationship. This ensures a large overlap between the first avoidance portion 1521 and the pressure relief mechanism 12, reducing obstruction to the gas inside the battery cell 10 and facilitating smooth gas flow toward the pressure relief mechanism 12. Furthermore, it ensures a large connection area between the second connection portion 152 and the tab 142, facilitating current transmission. If the area of ​​the first avoidance portion 1521 is too small, the remaining area of ​​the second connection portion 152 will overlap significantly with the pressure relief mechanism 12, making it easy for the second connection portion 152 to obstruct the pressure relief mechanism 12. This could result in the second connection portion 152 obstructing or blocking the pressure relief mechanism 12 in the event of thermal runaway of the battery cell 10, hindering pressure relief. If the area of ​​the first avoidance portion 1521 is too large, the connection area between the second connection portion 152 and the tab 142 will be too small, hindering current transmission.

[0104] See Figures 6 to 8 , and see further Figure 9 , Figure 9 Schematic diagram of the structure of the adapter 15 provided in some other embodiments of the present application. According to some embodiments of the present application, the first avoiding portion 1521 is a notch provided at the edge of the second connecting portion 152.

[0105] The first escape portion 1521 is a notch provided at the edge of the second connecting portion 152. It can be understood that the first escape portion 1521 is formed by cutting off a portion of the edge of the second connecting portion 152. The shape of the first escape portion 1521 can be determined based on the shape of the pressure relief mechanism 12, so that the first escape portion 1521 and the pressure relief mechanism 12 have a large overlapping area.

[0106] In the above solution, the first avoidance portion 1521 is a notch, which has a simple structure and is easy to process. At the same time, it facilitates the flow of gas toward the pressure relief mechanism 12.

[0107] In some embodiments, the first avoidance portion 1521 can also be a through hole arranged in the second connecting portion 152, and the first avoidance portion 1521 passes through the second connecting portion 152 along the thickness direction Z, and the thickness direction of the second connecting portion 152 is parallel to the thickness direction Z of the first wall 113. In other words, the second connecting portion 152 is arranged parallel to the first wall 113.

[0108] According to some embodiments of the present application, Figure 4 、 Figure 7 and Figure 9 As shown, the adapter 15 further includes a third connection portion 153 , which connects the first connection portion 151 and the second connection portion 152 , and the first avoidance portion 1521 is located at one end of the second connection portion 152 away from the connection portion between the second connection portion 152 and the third connection portion 153 .

[0109] The third connecting portion 153 is the portion of the adapter 15 that connects the first connecting portion 151 and the second connecting portion 152. The first connecting portion 151, the third connecting portion 153, and the third connecting portion 153 are arranged sequentially along the longitudinal direction X of the adapter 15. To save assembly space, the adapter 15 is bent, that is, the adapter 15 can be Z-shaped, with the third connecting portion 153 bent relative to the first connecting portion 151 and the second connecting portion 152. Along the thickness direction Z, the projection of the adapter 15 onto the first wall 113 is such that the projection of the first connecting portion 151 does not overlap with the pressure relief mechanism 12, the projection of the third connecting portion 153 does not overlap with the pressure relief mechanism 12, and the projection of the second connecting portion 152 does not overlap with at least a portion of the pressure relief mechanism 12. In other words, the projection of the pressure relief mechanism 12 onto the adapter 15 only falls within the second connecting portion 152, and the projection of the pressure relief mechanism 12 onto the second connecting portion 152 at least partially falls within the first clearance portion 1521. When thermal runaway occurs in the battery cell 10 , the second connection portion 152 may block the pressure relief mechanism 12 , while the first connection portion 151 and the third connection portion 153 do not block the pressure relief mechanism 12 .

[0110] The first avoidance portion 1521 is located at an end of the second connecting portion 152 that is away from the connection between the second connecting portion 152 and the third connecting portion 153. In other words, when the adapter 15 is unfolded, the first avoidance portion 1521 is located at an end of the second connecting portion 152 that is away from the third connecting portion 153. In this case, after the adapter 15 is connected to the electrode lead portion 13 and the tab 142, the third connecting portion 153 provides little or no shielding of the first avoidance portion 1521 along the thickness direction Z.

[0111] In the above solution, the first avoidance portion 1521 is located at one end of the second connection portion 152 away from the connection portion between the second connection portion 152 and the third connection portion 153, so as to facilitate the processing of the first avoidance portion 1521 and at the same time reduce the obstruction of the first avoidance portion 1521 by the third connection portion 153.

[0112] According to some embodiments of the present application, Figure 6 and Figure 7 As shown, the first avoiding portion 1521 has a first edge 1521a and a second edge 1521b, and the first edge 1521a and the second edge 1521b are arranged at an angle, or as shown in FIG. Figure 8 and Figure 9 As shown, the edge of the first avoiding portion 1521 is arc-shaped.

[0113] The first edge 1521a and the second edge 1521b are the two edges that make up the first relief portion 1521. The first edge 1521a and the second edge 1521b are arranged at an angle. In other words, the first edge 1521a and the second edge 1521b intersect, and the extension path of the first edge 1521a and the second edge 1521b can be a straight line. Alternatively, the extension path of the first edge 1521a and the second edge 1521b can also be a curve. Optionally, along the thickness direction Z, the projection of the first relief portion 1521 on the first wall 113 overlaps the pressure relief mechanism 12. In other words, the pressure relief mechanism 12 is located between the projection of the first edge 1521a on the first wall 113 and the projection of the second edge 1521b on the first wall 113. It should be noted that the angle between the first edge 1521a and the second edge 1521b can be determined based on the shape of the pressure relief mechanism 12, ensuring that the pressure relief mechanism 12 is located between the projection of the first edge 1521a and the projection of the second edge 1521b.

[0114] The phrase "the edge of the first relief portion 1521 is curved" means that the edge of the first relief portion 1521 is a portion of a circle or ellipse. When the pressure relief mechanism 12 is circular, the edge of the first relief portion 1521 is curved. The projection of this curved shape on the first wall 113 along the thickness direction Z can be an arc concentric with the pressure relief mechanism 12. In this case, the area of ​​the first relief portion 1521 can be greater than or equal to the area of ​​the pressure relief mechanism 12, thereby reducing the risk of the second connection portion 152 obstructing the pressure relief mechanism 12.

[0115] In the above scheme, when the first edge 1521a and the second edge 1521b are set at an angle, the first gap 1521 has a larger area, which can facilitate the gas to pass through the first gap 1521 and ensure that the gas flows smoothly toward the pressure relief mechanism 12; the edge of the first gap 1521 is arc-shaped, which is convenient for processing. At the same time, the size of the first gap 1521 on the second connecting portion 152 can be designed to be smaller to ensure that the second connecting portion 152 and the pole ear 142 have a larger connection area.

[0116] According to some embodiments of the present application, Figure 7 and Figure 9 As shown, the second connecting portion 152 includes a main body area 1522 and two connecting areas 1523 . The two connecting areas 1523 are connected to the tab 142 , and the first avoiding portion 1521 is located between the two connecting areas 1523 .

[0117] The connection region 1523 is the area of ​​the second connection portion 152 used to connect to the tab 142. The connection region 1523 can be welded to the tab 142 to ensure the connection strength between the second connection portion 152 and the tab 142. The two connection regions 1523 can be spaced apart to achieve connection with the tab 142 at two locations. Optionally, the connection region 1523 can be V-shaped, with the apex of the V facing the central axis of the electrode assembly 14. When the electrode assembly 14 has a wound structure, the connection region 1523 can connect the tabs 142 of the inner and outer rings of the electrode assembly 14.

[0118] The first avoiding portion 1521 may be a hollowed portion of the main body area 1522 .

[0119] The first avoidance portion 1521 is located between the two connection areas 1523 , and may be such that, along the arrangement direction of the two connection areas 1523 , the connection areas 1523 , the first avoidance portion 1521 and the other connection area 1523 are arranged in sequence.

[0120] In the above solution, the first avoiding portion 1521 is located between the two connecting areas 1523 to ensure a stable connection between the second connecting portion 152 and the tab 142 .

[0121] According to some embodiments of the present application, Figure 4 As shown, the tab 142 is formed with a second avoidance portion 1421 . Along the thickness direction Z, the projection of the second avoidance portion 1421 on the first wall 113 and the projection of the first avoidance portion 1521 on the first wall 113 at least partially overlap with the pressure relief mechanism 12 .

[0122] The second avoidance portion 1421 can be a hollowed-out portion of the tab 142 , that is, at the second avoidance portion 1421 , the electrode assembly 14 does not extend beyond the tab 142 ; or, the second avoidance portion 1421 can be a region with a lower height of the tab 142 , and when the battery cell 10 thermally runs away, the internal gas of the battery cell 10 can flow toward the pressure relief mechanism 12 through the second avoidance portion 1421 . For example, the electrode assembly 14 includes a main body 141 and a pole ear 142 extending from the end of the main body 141. The pole ear 142 can extend from the end of the main body 141 close to the first wall 113. When the pole ear 142 is a flattened structure, the second gap 1421 can be an area with a lower height of the flattened pole ear 142, that is, the height of the second gap 1421 protruding from the main body 141 is lower than the height of other areas of the pole ear 142 protruding from the pole ear 142. When the battery cell 10 thermally runs away, even if the pole ear 142 is deformed and changes from a flattened state to an upright state, the second gap 1421 has little blocking effect on the first gap 1521, which facilitates the gas to pass through the first gap 1521 and flow toward the pressure relief mechanism 12. The flattened structure is the structural form of the tab after it is flattened. The tab flattening process refers to pressing down the upright tabs 142 so that the tabs 142 contact each other to achieve better current collection. The flattened tabs 142 are tighter, making it easier to connect the tabs 142 to the adapter 15.

[0123] The projection of the second avoidance portion 1421 on the first wall 113 and the projection of the first avoidance portion 1521 on the first wall 113 at least partially overlap with the pressure relief mechanism 12. In other words, along the vertical direction, the second avoidance portion 1421, the first avoidance portion 1521 and the pressure relief mechanism 12 have an overlapping area. When the battery cell 10 thermally runs away, the pressure relief mechanism 12 is actuated, so that the second avoidance portion 1421, the first avoidance portion 1521 and the exhaust portion of the pressure relief mechanism 12 form a gas channel, so that the internal gas of the battery cell 10 can flow smoothly toward the pressure relief mechanism 12.

[0124] See Figure 10 , Figure 10 A top view of a battery cell 10 provided in some embodiments of the present application is shown. Figure 10 This is a simple schematic diagram, primarily illustrating the projection relationship between the second clearance portion 1421, the first clearance portion 1521, and the pressure relief mechanism 12. According to some embodiments of the present application, along the thickness direction Z, the projection of the first clearance portion 1521 on the electrode assembly 14 entirely falls within the second clearance portion 1421. The area of ​​the second clearance portion 1421 is S4, and the area of ​​the first clearance portion 1521 is S1, satisfying S4 ≥ S1.

[0125] The area S4 of the second gap portion 1421 is the area of ​​the second gap portion 1421 on a plane perpendicular to the thickness direction Z.

[0126] In the above scheme, the projection of the first space avoidance portion 1521 on the electrode assembly 14 falls entirely into the second space avoidance portion 1421, and the area S4 of the second space avoidance portion 1421 is greater than or equal to the area S1 of the first space avoidance portion 1521. This can reduce the risk of the tab 142 blocking the first space avoidance portion 1521, facilitate the gas inside the battery cell 10 to flow through the first space avoidance portion 1521 toward the pressure relief mechanism 12, and ensure smooth gas flow.

[0127] According to some embodiments of the present application, the profile of the second avoiding portion 1421 matches the profile of the first avoiding portion 1521 .

[0128] The contour of the second gap portion 1421 matches the contour of the first gap portion 1521, and the projection of the first gap portion 1521 on the electrode assembly 14 all falls into the second gap portion 1421, so that the second gap portion 1421 can have a smaller area and the tab 142 and the second connecting portion 152 can have a larger connection area.

[0129] In the above solution, the contour of the second avoidance portion 1421 matches the contour of the first avoidance portion 1521 , which not only ensures that the risk of the first avoidance portion 1521 being blocked by the tab 142 is small, but also ensures that the tab 142 and the second connecting portion 152 have a larger connection area.

[0130] According to some embodiments of the present application, Figure 3 and Figure 4 As shown, the electrode tab 142 is formed at one end of the electrode assembly 14 close to the first wall 113 , and the electrode lead portion 13 is disposed on the first wall 113 .

[0131] The electrode assembly 14 includes a main body 141 and a tab 142. The tab 142 extends from the end of the main body 141 close to the first wall 113. The electrode lead-out portion 13 is arranged on the first wall 113. The distance between the tab 142 and the electrode lead-out portion 13 is short to reduce the assembly space occupied by the adapter 15, thereby making the structure of the battery cell 10 compact and ensuring that the battery cell 10 has a higher energy density.

[0132] According to some embodiments of the present application, Figure 3 As shown, the housing 11 may include a shell 111 and a cover 112. The cover 112 is a first wall 113. The pressure relief mechanism 12 and the electrode lead 13 may be disposed on the cover 112. The tab 142 is formed at one end of the electrode assembly 14 near the cover 112. The adapter 15 is located between the tab 142 and the cover 112 to ensure a compact structure of the battery cell 10.

[0133] According to some embodiments of the present application, the present application further provides a battery 100, such as Figure 2As shown, it includes a box body 101 and a plurality of battery cells 10 provided by any of the above embodiments, and the plurality of battery cells 10 are arranged in the box body 101.

[0134] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery cell 10 provided by any of the above embodiments, wherein the battery cell 10 is used to provide electrical energy to the electrical device.

[0135] According to some embodiments of this application, see Figures 3 to 10 The present application provides a cylindrical battery cell, which includes a shell 11, a pressure relief mechanism 12, an electrode lead-out portion 13, an electrode assembly 14 and an adapter 15. The shell 11 includes a shell 111 and a cover 112, the shell 111 has an opening, the cover 112 closes the opening, and the cover 112 is a first wall 113. The pressure relief mechanism 12 is arranged on the first wall 113, and the electrode lead-out portion 13 is arranged on the first wall 113. The electrode assembly 14 is arranged in the shell 111. The electrode assembly 14 includes a main body 141 and a tab 142, and the tab 142 extends from the end of the main body 141 close to the first wall 113. The electrode assembly 14 can be a wound structure, and the tab 142 can be a flattened structure. The tab 142 is formed with a second avoidance portion 1421, and the second avoidance portion 1421 is a hollowed-out portion of the tab 142. The adapter 15 is located between the electrode tab 142 and the first wall 113. The adapter 15 includes a first connecting portion 151, a second connecting portion 152, and a third connecting portion 153. The first connecting portion 151 is connected to the electrode lead portion 13, the second connecting portion 152 is connected to the electrode tab 142, and the third connecting portion 153 connects the first connecting portion 151 and the second connecting portion 152. The second connecting portion 152 is formed with a first gap 1521, which is a notch formed on the edge of the second connecting portion 152. The first gap 1521 includes a first edge 1521a and a second edge 1521b, which are arranged at an angle. Along the thickness direction Z of the first wall 113, the projection of the second gap 1421 on the first wall 113, the projection of the first gap 1521 on the first wall 113 and the pressure relief mechanism 12 at least partially overlap. For example, along the thickness direction Z, the projection of the pressure relief mechanism 12 on the second connecting portion 152 all falls into the first gap 1521, and the projection of the first gap 1521 on the electrode assembly 14 all falls into the second gap 1421.

[0136] In such a cylindrical battery cell, when thermal runaway occurs, the pressure relief mechanism 12 is actuated, and the second air avoidance portion 1421, the first air avoidance portion 1521 and the exhaust portion of the pressure relief mechanism 12 form a gas channel. The internal gas can be discharged from the pressure relief mechanism 12 through the second air avoidance portion 1421 and the first air avoidance portion 1521, thereby improving the smoothness of gas flow, facilitating pressure relief by the pressure relief mechanism 12, and having higher safety.

[0137] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing comprising a first wall; a pressure relief mechanism, disposed on the first wall; an electrode lead-out portion, disposed on the housing; An electrode assembly is disposed in the housing, and the electrode assembly is provided with a tab; an adapter, at least a portion of which is disposed between the electrode tab and the first wall, and the electrode lead portion and the electrode tab are electrically connected via the adapter; Wherein, along the thickness direction of the first wall, the projection of the adapter on the first wall does not overlap with at least a portion of the pressure relief mechanism; The adapter includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the electrode lead portion, the second connecting portion is connected to the electrode tab, and a first avoidance portion is formed on the second connecting portion. Along the thickness direction, the projection of the pressure relief mechanism on the second connecting portion at least partially falls into the first avoidance portion; The electrode assembly includes a positive electrode sheet and a negative electrode sheet, the electrode assembly includes a main body and the tab extending from the end of the main body, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector not coated with the positive electrode active material layer is the positive electrode tab, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, the negative electrode current collector not coated with the negative electrode active material layer is the negative electrode tab; The electrode tab is formed with a second air avoidance portion. Along the thickness direction, the projection of the second air avoidance portion on the first wall and the projection of the first air avoidance portion on the first wall at least partially overlap with the pressure relief mechanism. The electrode tab is a flattened structure, and the height of the second air avoidance portion protruding from the main body is lower than the height of other areas of the electrode tab protruding from the main body.

2. The battery cell according to claim 1, wherein: Along the thickness direction, the projection of the pressure relief mechanism on the second connecting portion completely falls into the first avoidance portion, the area of ​​the first avoidance portion is S1, and the area of ​​the pressure relief mechanism is S2, satisfying S1≥S2.

3. The battery cell according to claim 1, wherein: The area of ​​the first avoidance portion is S1, and the area of ​​the second connection portion is S3, which satisfies 0<S1 / S3≤0.

75.

4. The battery cell according to claim 1, wherein: The first avoiding portion is a notch provided on the edge of the second connecting portion.

5. The battery cell according to claim 4, characterized in that The adapter also includes a third connecting portion connecting the first connecting portion and the second connecting portion, and the first avoiding portion is located at an end of the second connecting portion away from the connecting portion between the second connecting portion and the third connecting portion.

6. The battery cell according to claim 5, characterized in that The first space-avoiding portion has a first edge and a second edge, the first edge and the second edge are arranged at an angle, or the edge of the first space-avoiding portion is arc-shaped.

7. The battery cell according to claim 1, characterized in that The second connecting portion includes a main body area and two connecting areas, the two connecting areas are connected to the tab, and the first gap is located between the two connecting areas.

8. The battery cell according to claim 1, wherein: Along the thickness direction, the projection of the first gap portion on the electrode assembly completely falls into the second gap portion, the area of ​​the second gap portion is S4, and the area of ​​the first gap portion is S1, satisfying S4≥S1.

9. The battery cell according to claim 8, characterized in that The profile of the second gap portion matches the profile of the first gap portion.

10. The battery cell according to claim 1, characterized in that The electrode tab is formed at one end of the electrode assembly close to the first wall, and the electrode lead-out portion is disposed on the first wall.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The battery cell is a cylindrical battery cell.

12. A battery, characterized in that: The invention comprises a box body and a plurality of battery cells according to any one of claims 1 to 11, wherein the plurality of battery cells are arranged in the box body.

13. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 11.

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