Battery monomer, battery and electric equipment

Abstract

The utility model provides a battery monomer, a battery and electric equipment. The battery cell includes: a case including a case body and a cover body, the case body including a case body portion and an opening, and the cover body including a cover body edge and a cover body portion; the cover body seals the opening; the electrode assembly is arranged in the shell; the insulating film covers the outer side of the electrode assembly; the insulating film is provided with a pressure relief area; the pressure relief area is arranged opposite to the shell main body part and / or the cover main body part, in the process of generating gas in the battery monomer, the gas can more easily pass through the pressure relief area from the inner side of the insulating film to the outer side of the insulating film, and the directional emission of the gas is realized by utilizing the pressure relief area, so that on one hand, the channels and paths of gas emission can be increased; the risk of pressure building of gas on the inner side of the insulating film is reduced; and on the other hand, the risk that gas directly impacts the connection position of the cover body edge and the opening edge is reduced, so that the risk that the connection position of the cover body edge and the opening edge fails is reduced, and the use stability of the single battery is improved.

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] In power batteries, the reliability of the shell of the battery cell during operation is greatly challenged, especially at the connection point between the shell and the cover, where stress concentration is prone to occur, making the reliability of the connection point between the shell and the cover even more challenging. Utility Model Content

[0003] The present application provides a battery cell, a battery, and an electrical device to solve the technical problem of how to improve the reliability of the battery cell.

[0004] An embodiment of the present application provides a battery cell, which includes:

[0005] The housing comprises a shell and a cover, wherein the shell comprises a shell body and an opening, wherein the opening is formed by surrounding an opening edge, and the cover comprises a cover edge and a cover body; the cover edge is connected to the opening edge to close the opening;

[0006] an electrode assembly, disposed in the housing;

[0007] An insulating film, covering the outer side of the electrode assembly; the insulating film includes a pressure relief area;

[0008] Wherein, the pressure relief zone is arranged opposite to the shell body main body and / or the cover body main body.

[0009] The embodiment of the present application sets a pressure relief zone on the insulating film so that the structural strength of the pressure relief zone is lower than the structural strength of other positions on the insulating film. During the gas production inside the battery cell, it is convenient for the gas to pass through the pressure relief zone from the inner side of the insulating film to the outer side of the insulating film, thereby improving the pressure holding phenomenon caused by the failure of the gas to dissipate from the insulating film in time and reducing the possibility of concentrated pressure acting on a local part of the shell. In addition, the pressure relief zone in the embodiment of the present application is avoided from the position where the edge of the cover body and the edge of the opening are connected. The position setting of the pressure relief zone is utilized to realize the directional discharge of gas avoiding the position where the edge of the cover body and the edge of the opening are connected. On the one hand, it can increase the channel and path for gas discharge and reduce the risk of gas pressure holding inside the insulating film. On the other hand, it is beneficial to reduce the probability of gas directly impacting the position where the edge of the cover body and the edge of the opening are connected, thereby reducing the probability of gas directly acting on the position where the edge of the cover body and the edge of the opening are connected, so as to improve the reliability of the position where the edge of the cover body and the edge of the opening, thereby helping to improve the stability and reliability of the battery cell.

[0010] In some embodiments, the cover is welded to the shell, and a molten pool at the welding position of the cover and the shell forms a connection area where the edge of the cover is connected to the edge of the opening.

[0011] The welds between the cover and the housing in this embodiment are susceptible to stress concentration during battery vibration or tab pulling, making the weld pool formed at these locations less reliable than at other locations. Therefore, positioning the pressure relief area away from the weld pool effectively ensures the reliability of the weld pool, and thus the reliability of the battery cells. Furthermore, by welding the cover and housing together, assembly of the cover and housing is facilitated after the electrode assembly is inserted into the housing, improving assembly efficiency.

[0012] In some embodiments, the insulating film includes a first wall, the pressure relief area is provided on the first wall, and the first wall avoids the cover body and the connection area.

[0013] In the embodiment of the present application, based on the pressure relief area avoiding the connection area, the first wall of the pressure relief area is also set to avoid the cover body and the connection area, which is beneficial to further reduce the interference of the setting position of the pressure relief area on the connection area, thereby reducing the accumulation of released gas in the connection area, so as to improve the reliability of the connection area and the battery cell.

[0014] In some embodiments, the pressure relief zone faces any wall on the peripheral side of the shell.

[0015] The embodiment of the present application sets the pressure relief zone on any wall facing the circumference of the shell, which helps to further reduce the interference of the setting position of the pressure relief zone on the connection zone, thereby further reducing the risk of accumulation of released gas in the connection zone, causing the connection zone to fail.

[0016] In some embodiments, the shell is configured as a square shell, and the circumference of the shell has two first surfaces with larger areas and two second surfaces with smaller areas; the pressure relief zone faces at least one of the second surfaces.

[0017] The embodiment of the present application avoids the direction in which the two first surfaces of the electrode assembly expand relative to each other by setting the pressure relief zone in the area opposite to the second surface, thereby reducing the interference of the cyclic expansion of the electrode assembly on the pressure relief zone, reducing the reliability of the pressure relief zone from accidentally opening the valve in advance during the expansion of the electrode assembly, and improving the reliability of the pressure relief zone, thereby further improving the reliability of the battery cell.

[0018] In some embodiments, the pressure relief area is disposed at a position opposite to each of the second surfaces.

[0019] The embodiment of the present application provides pressure relief areas at opposite positions on the two second surfaces, thereby increasing channels for gas pressure relief, making the gas conduction paths more dispersed, and reducing the risk of gas concentration in specific areas, thereby reducing the risk of failure of the connection area or shell.

[0020] In some embodiments, the pressure relief area is configured as a through hole, and the through hole passes through two opposite sides of the insulating film in a thickness direction.

[0021] In the embodiment of the present application, the pressure relief area is set as a through hole that penetrates the insulating film on opposite sides in the thickness direction. The forming method of the through hole is simple and quick. While reducing the risk of internal pressure accumulation and failure of the connection area of ​​the battery cell, it is also beneficial to improve the production capacity of the battery cell.

[0022] In some embodiments, the insulating film includes a main body and a movable portion, the pressure relief area is arranged on the main body, a portion of the movable portion is connected to the main body, and another portion of the movable portion can move relative to the main body between a position of blocking the through hole and a position of opening the through hole.

[0023] In the embodiments of the present application, a movable portion is provided, with part of the movable portion connected to the main body and the other part disconnected from the main body, so that the movable portion can move relative to the main body between a position that blocks the through-hole and a position that opens the through-hole. When the battery cell is in normal operation, the movable portion can block the flow of electrolyte and other substances through the through-hole, thereby reducing ion channels, extending the service life of the battery cell, and improving the operating stability of the battery cell. When the battery cell is producing gas, the gas can drive the movable portion to remain in an open state relative to the through-hole, allowing gas to flow through the through-hole, which is beneficial for dispersing and guiding the gas generated inside the insulating film, reducing the risk of gas accumulation at the connection, and thus improving the reliability of the connection area and the battery cell.

[0024] In some embodiments, the movable portion and the body are integrally formed.

[0025] The embodiments of the present application utilize an integrated molding process for the movable portion and the main body, which improves the processing efficiency of the insulating film and reduces the difficulty of molding the movable portion. This helps to reduce the risk of shell failure in the event of thermal runaway while also increasing the production capacity of the battery cells. In some embodiments, a portion of the movable portion is integrally connected to the main body, while another portion is connected to the main body via intermittent or continuous notches; alternatively, a portion of the movable portion is integrally connected to the main body, while another portion is disconnected from the main body.

[0026] The embodiment of the present application helps to reduce the difficulty of processing the movable part by limiting the connection form between the movable part and the main body.

[0027] In some embodiments, the movable portion is square, one side of the movable portion is connected to the main body, and the other three sides of the movable portion are movable relative to the main body.

[0028] The present application facilitates improving the molding efficiency of the movable portion by setting the movable portion to be square.

[0029] In some embodiments, the portion of the insulating film other than the pressure relief area is the main body, and the material of the pressure relief area is different from that of the main body, wherein the melting point of the pressure relief area is lower than that of the main body.

[0030] In the embodiment of the present application, by setting the melting point of the pressure relief zone to be lower than the melting point of the main body, in the state of thermal runaway, high-temperature gas is generated inside the insulating film, and the gas melts the pressure relief zone with a low melting point first, so that the gas can be conducted from the inside of the insulating film to the outside of the insulating film through the melted pressure relief zone, thereby reducing the risk of internal pressure buildup.

[0031] In some embodiments, the portion of the insulating film other than the pressure relief area is the main body, and the thickness of the pressure relief area is smaller than the thickness of the main body.

[0032] In the embodiment of the present application, the thickness of the pressure relief area in the insulating film is set to be smaller than the thickness of the main body. When the main body and the pressure relief area are made of the same material, the structural strength of the pressure relief area is smaller than that of the main body. When the gas production is constant, the gas is more likely to break through the pressure relief area with weak structural strength and be conducted to the outside of the insulating film, thereby reducing the risk of pressure accumulation inside the insulating film.

[0033] In some embodiments, the thickness of the pressure relief area is greater than 0 and less than 0.1 mm.

[0034] The embodiment of the present application sets the pressure relief zone within a certain range, which is beneficial to reducing the ion channel of the insulating membrane when the battery cell is in normal working condition, and can also achieve the pressure relief effect when the battery cell is in a gas production state.

[0035] In some embodiments, the melting point of the pressure relief zone is lower than the melting point of the body.

[0036] In this embodiment, the material of the main body and the material of the pressure relief zone can be set differently, that is, the thickness of the pressure relief zone is reduced and the melting point of the pressure relief zone is lowered. When the electrode assembly produces gas, the speed at which the pressure relief zone is broken can be accelerated, thereby increasing the speed of pressure relief and reducing the spread of battery cell risks.

[0037] In some embodiments, the insulating film is at least partially stacked on the side of the shell to form an overlapping area, the thickness of the overlapping area is greater than the thickness of other areas, and the pressure relief area is provided in the overlapping area.

[0038] In the embodiment of the present application, the pressure relief area is set in the overlapping area of ​​the insulating film, and the thickness of the overlapping area is greater than the thickness of other areas. During the gas production process of the battery cell, the gas is conducted through the pressure relief area to between adjacent insulating films, and then discharged to the outside of the insulating film through the gap between the adjacent insulating films, thereby achieving pressure relief of the gas inside the insulating film.

[0039] In some embodiments, the overlapping region includes at least two layers of insulating films, and at least one of the at least two layers of insulating films is provided with the pressure relief region.

[0040] The embodiment of the present application provides at least one layer of insulating film in the overlapping area with at least one group of pressure relief areas, which is beneficial to improving the efficiency of gas conduction and thus reducing the risk of pressure buildup in the electrode assembly.

[0041] In some embodiments, each insulating film layer in the overlapping region is provided with a pressure relief region, and in adjacent insulating films, the pressure relief region of one insulating film is opposite to a position of another insulating film where no pressure relief region is provided.

[0042] The embodiment of the present application provides each insulating film layer in the overlapping area with a set of pressure relief areas, which helps to improve the path for the electrolyte to flow from the inside of the insulating film to the outside of the insulating film under normal working conditions of the battery cell, thereby helping to extend the service life of the battery cell.

[0043] In some embodiments, there are multiple pressure relief zones, and the multiple pressure relief zones are arranged at intervals.

[0044] The embodiment of the present application provides multiple pressure relief zones, and the multiple pressure relief zones are spaced apart, which is beneficial to improving the dispersion of gas extraction and reducing the risk of gas accumulation in specific areas, thereby further reducing the risk of failure at the connection.

[0045] In some embodiments, the insulating film forms an opening on one side of the electrode assembly output tab, and the opening faces the cover, or the opening faces the side of the shell.

[0046] The gas in the embodiment of the present application can be released from the positions of the opening and the pressure relief area, so that the released gas is dispersed, which is helpful to reduce the risk of gas pressure buildup.

[0047] In some embodiments, the battery cell further comprises:

[0048] A plastic part is disposed on a side of the cover body near the opening, and the insulating film is at least partially fixed to the plastic part. In the embodiment of the present application, by fixing the insulating film at least partially to the plastic part, it is easier to install the insulating film into the housing. Furthermore, the insulating film is at least partially disconnected from the plastic part, which helps disperse the gas conduction path, thereby reducing the risk of gas pressure buildup in the electrode assembly.

[0049] In some embodiments, the battery cell further comprises:

[0050] The pole is arranged on the cover body, and the pole is electrically connected to the electrode assembly.

[0051] In the embodiment of the present application, a pole is provided on the cover body, and the pressure relief zone is provided away from the cover body, which is beneficial to reducing the interference of the pressure relief gas on the pole and also beneficial to reducing the interference of the pressure relief gas on the connection area.

[0052] In some embodiments, at least two electrode assemblies are provided, each electrode assembly comprising a pole piece and a separator, wherein the pole piece and the separator are wound together, adjacent electrode assemblies are arranged side by side, and an insulating film is coated on the outside of the at least two electrode assemblies;

[0053] A gap is formed between the electrode assemblies arranged side by side in the width direction, and the pressure relief area on the insulating film is arranged opposite to the gap.

[0054] The embodiment of the present application sets the pressure relief zone at a position relative to the gap, which helps to reduce the interference of the electrode assembly on the pressure relief zone during the gas production process of the electrode assembly, thereby helping to improve the exhaust efficiency.

[0055] The embodiment of the present application provides a battery comprising the above-mentioned battery cell, thereby effectively improving the reliability of the battery.

[0056] The embodiment of the present application provides an electrical device including the above-mentioned battery cell or the above-mentioned battery. Therefore, the reliability of the electrical device can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. 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 these drawings without any creative work.

[0058] Figure 1 A schematic diagram of the structure of the electrical equipment disclosed in the embodiments of this application;

[0059] Figure 2 A schematic diagram of the structure of a battery disclosed in an embodiment of the present application;

[0060] Figure 3 A schematic structural diagram of a battery cell disclosed in an embodiment of the present application;

[0061] Figure 4 An exploded view of a battery cell disclosed in an embodiment of the present application;

[0062] Figure 5 This is a schematic structural diagram of an insulating film according to the first embodiment of the present application;

[0063] Figure 6This is a schematic structural diagram of an insulating film according to a second embodiment of the present application;

[0064] Figure 7 A top view of an insulating film according to a third embodiment of the present application;

[0065] Figure 8 This is a schematic structural diagram of an insulating film according to a fourth embodiment of the present application;

[0066] Figure 9 This is a schematic structural diagram of an insulating film according to a fifth embodiment of the present application;

[0067] Figure 10 This is a schematic structural diagram of the insulating film of the sixth embodiment of the present application.

[0068] In the drawings, the drawings are not drawn to scale.

[0069] Marking Description:

[0070] 1000, vehicle; 200, controller; 300, motor; 100, battery; 214, upper cover; 211, carrier; 10, battery cell; 1, outer shell; 11, shell; 110, opening; 111, first surface; 112, second surface; 113, shell body; 114, opening edge; 12, cover; 121, cover edge; 122, cover body; 13, connection area; 2, electrode assembly; 20, gap; 21, tab; 3, insulating film; 30, pressure relief area; 301, through hole; 31, body; 32, movable part; 33, first wall; 34, overlapping area; 35, opening; 36, second wall; 37, third wall; 4, pole; 5, plastic part; 6, pressure relief part. DETAILED DESCRIPTION

[0071] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein 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 this application are intended to cover non-exclusive inclusions.

[0073] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise explicitly and specifically defined.

[0074] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present 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. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0075] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0076] In the description of the embodiments of the present application, the technical terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", "height direction", "first direction", "second direction", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0077] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0078] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0079] With the development of clean energy, more and more devices are using electricity as a driving force. Consequently, power batteries, such as lithium-ion batteries, that can store large amounts of electricity and undergo multiple charge and discharge cycles are rapidly developing. These batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields.

[0080] With the country's vigorous promotion of new energy vehicles, new energy vehicles have ushered in a golden opportunity for development. Vehicle safety and stability have always been of primary concern. Therefore, improving the safety of new energy vehicles will be one of the key factors determining their rapid adoption. Improving battery safety is a key approach to improving the safety of new energy vehicles.

[0081] 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 or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0082] A battery cell may include an electrode assembly and an electrolyte (a solid electrolyte layer located between the positive and negative electrode sheets in a solid-state battery). 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 positive electrode collector not coated with the positive active material layer protrudes from the positive electrode collector coated with the positive active material layer, and the positive electrode collector not coated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector may be made of aluminum, and the positive electrode active material may 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 negative electrode collector not coated with the negative active material layer protrudes from the negative electrode collector coated with the negative active material layer, and the negative electrode collector not coated with the negative active material layer 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).

[0083] Illustratively, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0084] For example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0085] Illustratively, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0086] For example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0087] Illustratively, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0088] Illustratively, the negative electrode active material may be a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0089] The development of battery technology must take into account multiple design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, the safety and reliability of the battery must also be considered.

[0090] In power batteries, gas is generated inside the battery cells during operation, and the generated gas is easily compressed inside the insulating film of the battery cells. When the internal gas pressure reaches a certain level, the gas will concentrate on the outer shell of the battery cells, which may affect the reliability of the outer shell. Since the connection position between the shell and the cover is prone to stress concentration during the pulling of the tabs and the vibration of the battery, the pressure phenomenon is particularly likely to affect the reliability of the connection position between the shell and the cover, thereby hindering the further improvement of the reliability of the battery cells.

[0091] An embodiment of the present application provides a battery cell, which includes an outer shell, an electrode assembly and an insulating film. The outer shell includes a shell and a cover. The shell includes a shell body and an opening, and the opening is formed by surrounding the opening edge. The cover includes a cover edge and a cover body body; the cover edge is connected to the opening edge to close the opening, the electrode assembly is arranged in the outer shell, and the insulating film is covered on the outside of the electrode assembly. The insulating film is provided with a pressure relief zone, and the pressure relief zone is configured to be able to discharge the gas produced by the electrode assembly to the outside of the insulating film, wherein the pressure relief zone is arranged relative to the shell body and / or the cover body body.

[0092] The embodiment of the present application sets a pressure relief zone on the insulating film so that the structural strength of the pressure relief zone is lower than the structural strength of other positions on the insulating film. During the gas production inside the battery cell, the gas is facilitated to pass through the pressure relief zone from the inner side of the insulating film to the outer side of the insulating film, thereby improving the pressure holding phenomenon caused by the failure of gas to dissipate from the insulating film in time and reducing the possibility of concentrated pressure acting on a local part of the shell. In addition, the pressure relief zone and the connection zone in the embodiment of the present application are avoided. The position setting of the pressure relief zone is utilized to achieve directional discharge of gas avoiding the position where the edge of the cover body and the edge of the opening are connected. On the one hand, it can increase the channel and path for gas discharge and reduce the risk of gas pressure holding inside the insulating film. On the other hand, it is beneficial to reduce the probability of gas directly impacting the position where the edge of the cover body and the edge of the opening are connected, thereby reducing the probability of gas directly acting on the position where the edge of the cover body and the edge of the opening are connected, so as to improve the reliability of the position where the edge of the cover body and the edge of the opening are connected, thereby helping to improve the stability and reliability of the battery cell.

[0093] The technical solutions described in the embodiments of this application are applicable to electric devices using batteries. The electric devices include the batteries of any embodiment of this application, and the batteries are used to provide electrical energy.

[0094] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. 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, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0095] It should be noted that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including boxes and electrical equipment using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0096] Please refer to Figure 1, a controller 200, a motor 300 and a battery 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000 and for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] To meet varying power requirements, the battery 100 may include multiple battery cells 10. A battery cell 10 is the smallest unit that makes up a battery module or battery pack. Multiple battery cells 10 may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 10. Multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 10 is housed within a housing. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid configuration to form a battery module. The battery 100 may also include other structures. For example, the battery 100 may include a busbar to electrically connect the multiple battery cells 10. Each battery cell 10 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cells 10 may be cylindrical, flat, rectangular, or have other shapes.

[0098] The enclosure can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The enclosure can be made of alloy materials such as aluminum alloy and iron alloy, polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin.

[0099] The box is used to accommodate the battery assembly, and the box can be of various structures. In some embodiments, see Figure 2The case may include an upper cover 214 and a carrier 211. The upper cover 214 and the carrier 211 cover each other and together define a chamber for accommodating the battery cell 10. The carrier 211 may be a hollow structure with one end open, and the upper cover 214 is a plate-like structure. The upper cover 214 covers the open side of the carrier 211 to form a case with a chamber. The upper cover 214 and the carrier 211 may also both be hollow structures with one end open, with the open side of the upper cover 214 covering the open side of the carrier 211 to form a case with a chamber. Of course, the upper cover 214 and the carrier 211 may take a variety of shapes, such as a cylinder, a cuboid, etc.

[0100] In order to improve the sealing performance after the upper cover 214 and the carrier 211 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the upper cover 214 and the carrier 211 .

[0101] Assuming that the upper cover 214 covers the top of the carrier 211 , the upper cover 214 can also be called an upper box cover, and the carrier 211 can also be called a lower box cover.

[0102] like Figure 3 and Figure 4 As shown, a battery cell 10 provided in the present application includes a shell 1, an electrode assembly 2 and an insulating film 3. The insulating film 3 is coated on the outside of the electrode assembly 2, and the shell 1 encapsulates the electrode assembly 2 coated with the insulating film 3 to form a battery cell 10. The insulating film 3 can be a mylar film, and the shell 1 can be an aluminum shell, a steel shell, or an aluminum-plastic film. The electrode assembly 2 can be wound or laminated. After the electrode assembly is formed, the mylar film and the shell are packaged through the mylar wrapping process and the shell insertion process. Among them, the mylar film plays the role of sealing and protecting the electrode assembly 2, and the mylar film can effectively insulate the electrode assembly 2 and the shell 1 from each other, reducing the risk of internal short circuit in the battery cell 10. The shell 1 plays a protective role.

[0103] The housing 1 in the embodiment of the present application includes a shell 11 and a cover 12. The shell 11 is provided with an opening 110, and the cover 12 closes the opening 110 to form a closed space for accommodating substances such as the electrode assembly 2 and the electrolyte. The shell 11 may be provided with one or more openings 110. The cover 12 may also be correspondingly provided with one or more openings to close the corresponding openings 110. In some embodiments, a pressure relief member 6 is provided on the shell 1. The pressure relief member 6 may be on either the shell 11 or the cover 12. The pressure relief member 6 is used to release the internal pressure of the battery cell 10. It should be noted that the pressure relief member 6 may be an explosion-proof valve or a pressure relief hole, etc.

[0104] Reference Figure 3 and Figure 4As shown, in the embodiment of the present application, the shell 11 has one opening 110, and the cover body 12 is connected to the periphery of the opening 110 to form a connection area 13; it should be noted that the periphery of the opening 110 represents the end area of ​​the shell 11 close to the opening 110, and the end area surrounds the above-mentioned opening 110, and the cover body 12 is connected to the periphery of the opening 110. The embodiment of the present application does not limit the form of connection between the cover body 12 and the shell 11. For example, the cover body 12 can be fixed to the shell 11 by welding, and the cover body 12 and the shell 11 can also be fixed by bonding. Regardless of the form, as long as the relative position of the cover body 12 and the shell 11 can be stable, it can be used.

[0105] Combine Figure 4 and Figure 5 As shown, the insulating film 3 is provided with a pressure relief area 30, which is configured to guide the gas generated by the electrode assembly 2 out of the insulating film 3. Specifically, during the charging or discharging process of the battery cell 10, the positive and negative electrode materials within the battery cell 10 undergo an oxidation-reduction reaction, thereby generating gas. For example, during the charging process of a lithium-ion battery, the positive electrode releases oxygen and the negative electrode releases hydrogen. Alternatively, under high temperature or overcharging conditions, the electrolyte within the battery cell 10 may expand and generate bubbles, causing gas to be generated within the battery cell 10.

[0106] The pressure relief area 30 in the embodiment of the present application indicates that the structural strength of this area is lower than the structural strength of other positions on the insulating film 3. During the gas production process of the battery cell 10, the pressure relief area 30 with low structural strength is easier to be opened, thereby achieving gas conduction in the pressure relief area 30.

[0107] Combine Figure 4 and Figure 5 As shown, the pressure relief area 30 avoids the connection area 13. It should be noted that the avoidance described in the embodiment of the present application means that the pressure relief area 30 and the connection area 13 are set in an offset position. It can also be understood that during the gas production process, if the gas flows from the inside of the insulating film 3 to the outside of the insulating film 3 through the pressure relief area 30, the gas flow path and the connection area 13 avoid each other, and the gas discharged from the pressure relief area 30 is difficult to directly impact the connection area 13, thereby reducing the risk of gas accumulation in the connection area 13 at the same time, so as to reduce the risk of the gas temperature in the connection area 13 being too high, causing the shell 11 to fail, which is beneficial to improving the stability of the battery cell 10.

[0108] like Figure 4 As shown, the housing 11 includes a housing body 113 and an opening 110, which is surrounded by an opening edge 114. The cover 12 includes a cover edge 121 and a cover body 122. The cover edge 121 is connected to the opening edge 114 to close the opening 110. The pressure relief area 30 is arranged opposite the housing body 113 and / or the cover body 122.

[0109] It should be noted that the relative setting means that the position where the pressure relief zone 30 is set is toward the position where the shell body main body 113 is set, or the position where the pressure relief zone 30 is set is toward the position where the cover body main body 122 is set, or, when there are multiple pressure relief zones 30, the pressure relief zone 30 is both toward the position where the cover body main body 122 is set and the position where the shell body main body 113 is set.

[0110] An embodiment of the present application provides a battery cell 10, which includes a shell 1, an electrode assembly 2 and an insulating film 3. The shell 1 includes a shell 11 and a cover 12. The shell 11 includes a shell body 113 and an opening 110. The opening 110 is formed by surrounding an opening edge 114. The cover 12 includes a cover edge 121 and a cover body 122. The cover edge 121 is connected to the opening edge 114 to close the opening 110. The electrode assembly 2 is arranged in the shell 1, and the insulating film 3 is covered on the outside of the electrode assembly 2. The insulating film 3 is provided with a pressure relief area 30. The pressure relief area 30 is configured to be able to discharge the gas produced by the electrode assembly 2 to the outside of the insulating film 3, wherein the pressure relief area 30 is arranged opposite to the shell body and / or the cover body. In the embodiment of the present application, a pressure relief area 30 is provided on the insulating film 3, so that the structural strength of the pressure relief area 30 is lower than the structural strength of other positions on the insulating film 3. During the gas generation process inside the battery cell 10, the gas is easily discharged from the inner side of the insulating film 3 to the outer side of the insulating film 3 through the pressure relief area 30, thereby improving the pressure accumulation phenomenon caused by the failure of the gas to dissipate from the insulating film 3 in time, and reducing the possibility of concentrated pressure acting on a local part of the shell 11 due to the pressure accumulation. In addition, the pressure relief area 30 in the embodiment of the present application is avoided from the position where the edge of the cover and the edge of the opening are connected. The position setting of the pressure relief area 30 is used to achieve directional discharge of gas avoiding the position where the edge of the cover and the edge of the opening are connected. On the one hand, it can increase the channel and path for gas discharge and reduce the risk of gas pressure accumulation inside the insulating film 3. On the other hand, it is conducive to reducing the probability of gas directly impacting the position where the edge of the cover and the edge of the opening are connected, thereby reducing the probability of gas directly acting on the position where the edge of the cover and the edge of the opening are connected, so as to improve the reliability of the position where the edge of the cover and the edge of the opening are connected, thereby helping to improve the stability and reliability of the battery cell 10.

[0111] In some embodiments, as Figure 3 and Figure 4As shown, the cover 12 is welded and fixed to the shell 11, and the position where the cover 12 and the shell 11 are welded forms a connection area 13. It should be noted that during the welding process, the end of the cover 12 and the shell 11 forming the opening 110 is heated so that the end of the cover 12 and the shell 11 forming the opening 110 reaches the melting point. The welding method in the embodiment of the present application includes but is not limited to heat sources such as flame, arc, and laser. After the cover 12 and the shell 11 reach the melting point, the corresponding positions of the cover 12 and the shell 11 will begin to melt and form a liquid state, and the cover 12 and the shell 11 at the molten position will form a molten pool, which is maintained at an appropriate temperature and shape so that a solid connection is formed after the cover 12 and the shell 11 are welded. After the welding is completed, the connection area cools to solidify to form a stable connection. The connection area 13 described in the embodiment of the present application represents the area that solidifies after the cover 12 and the shell 11 are welded and melted during the above-mentioned welding process, or the connection area 13 can be an area covering the above-mentioned welded and fixed area.

[0112] In the embodiment of the present application, the welds between the cover 12 and the housing 11 are susceptible to stress concentration during battery vibration or tab pulling, making the weld pool formed at these locations less reliable than at other locations. Therefore, the pressure relief area 30, avoiding the weld pool, effectively ensures the reliability of the weld pool, and thus the reliability of the battery cell 10. Furthermore, by welding the cover 12 to the housing 11, assembly of the cover 12 and housing 11 is facilitated after the electrode assembly 2 is inserted into the housing, improving assembly efficiency.

[0113] In some embodiments, as Figure 4 As shown, the first wall 33 of the insulating film 3 is provided with a pressure relief area 30, and the first wall 33 avoids the cover 12 and the connection area 13. It should be noted that "avoid" can be understood as meaning that the direction of gas released from the pressure relief area 30 of the first wall 33 is not in the direction of the cover 12 or the connection area 13. It can also be understood that the thickness direction of the first wall 33 can be consistent with the surface extension direction of the cover 12, and the first wall 33 and the cover 12 are offset in the height direction of the battery cell 10.

[0114] In the embodiment of the present application, based on the pressure relief area 30 avoiding the connection area 13, the first wall 33 of the pressure relief area 30 is also set to avoid the cover body 12 and the connection area 13, which is beneficial to further reduce the interference of the setting position of the pressure relief area 30 on the connection area 13, thereby reducing the accumulation of released gas in the connection area 13, so as to improve the reliability of the connection area 13 and the battery cell 10.

[0115] In some embodiments, as Figure 4 The pressure relief area 30 is opposite to any wall on the side of the housing 11. Any wall on the side of the housing 11 can be understood as the side of the housing 11, which surrounds the opening 110, and the opening 110 is arranged opposite to the bottom of the housing 11.

[0116] The embodiment of the present application sets the pressure relief zone 30 on any wall facing the side of the shell 11, which is beneficial to further reduce the interference of the setting position of the pressure relief zone 30 on the connection zone 13, thereby further reducing the accumulation of released gas in the connection zone 13, thereby improving the reliability of the connection zone 13 and the battery cell 10.

[0117] In some embodiments, combined Figure 3-Figure 5 As shown, the housing 1 is configured as a square housing, which means that the surface of the housing 1 is a cubic structure. Of course, in other embodiments, the housing 1 can also be configured as a cylindrical structure. In the embodiment of the present application, the side of the housing 11 has two first surfaces 111 with a larger area and two second surfaces 112 with a smaller area.

[0118] It should be noted that one end of the shell 11 is open to connect with the cover body 12, and the other end of the shell 11 opposite to the opening is the bottom of the shell 11. The relative direction of the opening and the bottom of the shell 11 can be the height direction of the battery cell 10, or other directions of the battery cell 10. Other positions in the shell 11 except the opening and the bottom are defined as the side of the shell. In the square shell battery cell 10, the side may include two large surfaces and two small surfaces. The two surfaces with larger areas are the first surface 111, and the two surfaces with smaller areas are the second surface 112. The pressure relief zone 30 in the embodiment of the present application is arranged at a position opposite to at least one second surface 112. That is to say, when the insulating film 3 is wrapped around the outside of the electrode assembly 2, the shape of the insulating film 3 can adapt to the shape of the electrode assembly 2 or the shell 11. Accordingly, the insulating film 3 also roughly has two large surfaces (refer to Figure 10 The third wall 37 shown) and two small faces (refer to Figure 10 The first wall 33 shown) and the bottom surface (refer to Figure 10 As shown in the second wall 36 , the pressure relief area 30 in the insulating film 3 is arranged at positions corresponding to the two small faces, so that the pressure relief area 30 is opposite to the second surface 112 of the housing 11 .

[0119] During the cyclic expansion of the battery cell 10, affected by the arrangement of the pole pieces in the electrode assembly 2, the electrode assembly 2 generally expands and contracts in the direction in which the two first surfaces 111 are relatively set. For example, during the expansion process, the electrode assembly 2 will increase in size in the direction in which the two first surfaces 111 are relatively set, so that the electrode assembly 2 squeezes the insulating film 3 on the large surface and the first surface 111 of the shell 11. Therefore, the embodiment of the present application avoids the direction in which the two first surfaces 111 of the electrode assembly 2 are relatively set by setting the pressure relief zone 30 in the area opposite to the second surface 112, thereby reducing the interference of the cyclic expansion of the electrode assembly 2 on the pressure relief zone 30, reducing the reliability of the pressure relief zone 30 accidentally opening the valve in advance during the expansion of the electrode assembly 2, and improving the reliability of the pressure relief zone 30, thereby further improving the reliability of the battery cell 10.

[0120] In some embodiments, as Figure 5 As shown, the pressure relief area 30 is provided at a position opposite to each second surface 112. That is, in the case of a square-shell battery cell 10, the housing 11 of the battery cell 10 has two opposite second surfaces 112, and in the embodiment of the present application, a pressure relief area 30 is provided on each second surface 112.

[0121] The embodiment of the present application provides pressure relief areas 30 at opposite positions of the two second surfaces 112 , thereby increasing channels for gas pressure relief, making the gas conduction paths more dispersed, and reducing the risk of gas concentration in specific areas, thereby improving the reliability of the connection area 13 and the battery cell 10 .

[0122] In some embodiments, as Figure 5 As shown, the pressure relief area 30 is configured as a through hole 301, which passes through two opposite sides of the insulating film 3 in the thickness direction. One side of the insulating film 3 in the thickness direction is the inner side of the insulating film 3, and the other side of the insulating film 3 in the thickness direction is the outer side of the insulating film 3. The inner side of the insulating film 3 is closer to the electrode assembly 2 than the outer side, and the outer side of the insulating film 3 is closer to the housing 1 than the inner side. The through hole 301 can conduct the gas generated by the electrode assembly 2 from the inner side of the insulating film 3 to the outer side of the insulating film 3.

[0123] In the embodiment of the present application, the pressure relief area 30 is set as a through hole 301 that penetrates the insulating film 3 on two opposite sides in the thickness direction. The forming method of the through hole 301 is simple and quick, which reduces the internal pressure of the battery cell 10 and improves the reliability of the connection area 13 and the battery cell 10, and is also beneficial to improving the production capacity of the battery cell 10.

[0124] In some embodiments, as Figure 6As shown, the position on the insulating film 3 other than the pressure relief area 30 is the main body 31, and the battery cell 10 also includes a movable portion 32, a portion of the movable portion 32 is connected to the main body 31, and the other portion of the movable portion 32 is movable relative to the main body 31. It should be noted that the embodiment of the present application does not limit the connection form of the movable portion 32 and the main body 31, as long as the main body 31 can limit and fix the relative position of at least part of the movable portion 32. Among them, the movable portion 32 in the embodiment of the present application can be movable relative to the main body 31, which means that the movable portion 32 can have different position states relative to the main body 31. For example, the movable portion 32 can be maintained in a position state of blocking the through hole 301 relative to the main body 31, and the movable portion 32 can also be maintained in a position state of opening the through hole 301 relative to the main body 31, and the movable portion 32 can also move relative to the main body 31 between a position of maintaining the open through hole 301 and a position of maintaining the blocking through hole 301.

[0125] In the embodiment of the present application, a movable portion 32 is provided, with part of the movable portion 32 connected to the body 31 and the other part disconnected from the body 31, so that the movable portion 32 can move relative to the body 31 between blocking the through-hole 301 and opening the through-hole 301. When the battery cell 10 is in normal operation, the movable portion 32 can block the flow of electrolyte and other substances through the through-hole 301, thereby reducing ion channels, extending the service life of the battery cell 10, and improving the operating stability of the battery cell 10. When the battery cell 10 is generating gas, the gas can drive the movable portion 32 to remain open relative to the through-hole 301, allowing gas to flow through the through-hole 301. This facilitates the dispersion and discharge of gas generated inside the insulating film 3, reduces the risk of gas accumulation in the connection area 13, and improves the reliability of the connection area 13 and the battery cell 10. It should be noted that the embodiment of the present application does not limit the movement of the movable portion 32 relative to the body 31. The movement can be an irregular trajectory or a regular swing. The movement form of the movable portion 32 does not limit the function of the movable portion 32 in the embodiment of the present application.

[0126] It should be noted that the embodiment of the present application does not limit the connection range between the movable part 32 and the main body 31. Specifically, a through hole 301 is provided at a part of the main body 31 to pass through the opposite sides of the insulating film 3. The movable part 32 can be provided at a position covering the through hole 301, and the movable part 32 can be partially connected to the inner edge of the through hole 301 formed by the main body 31. Among them, the movable part 32 can be connected to a part of the inner edge of the through hole 301 formed by the main body 31, and the movable part 32 is not connected to the other part of the inner edge of the through hole 301 formed by the main body 31, and the connection position is in a continuous state. In other embodiments, the connection position can be set in a discrete state, for example, a part of the movable part 32 is integrally connected to the main body 31, and the other part of the movable part 32 is connected to the main body 31 through an intermittent / continuous notch.

[0127] The embodiment of the present application reduces the difficulty of processing the movable portion 32 by limiting the connection form between the movable portion 32 and the main body 31 .

[0128] In some embodiments, as Figure 6 As shown, the movable portion 32 is square, one side of the movable portion 32 is connected to the body 31, and the other three sides of the movable portion 32 are movable relative to the body 31. The present application is conducive to improving the molding efficiency of the movable portion 32 by setting the movable portion 32 to be square.

[0129] In some embodiments, the activity state of the movable portion 32 is affected by the working state of the electrode assembly 2. For example, when the electrode assembly 2 is in a gas-producing state, the gas pressure inside the insulating film 3 is greater than the gas pressure outside the insulating film 3. Under the action of the pressure difference between the inside and outside of the insulating film 3, the gas will drive the movable portion 32 to move relative to the main body 31, thereby enabling the movable portion 32 to move relative to the main body 31 between the position of blocking the through hole 301 and the position of opening the through hole 301. Specifically, for example, when the air pressure inside the insulating film 3 is greater than the external air pressure, the gas will drive the main body 31 to open the through hole 301, and the gas will flow from the inside of the insulating film 3 to the outside of the insulating film 3 through the through hole 301, thereby releasing the air pressure inside the insulating film 3; when the pressure difference between the air pressure inside and outside the insulating film 3 is less than the set value, the pressure difference between the inside and outside of the insulating film 3 is not enough to drive the movable part 32 to move, so that the movable part 32 maintains the state of blocking the through hole 301 under the limitation of the electrode assembly 2 and the shell 11, which is beneficial to reducing the risk of the electrolyte in the electrode assembly 2 flowing from the through hole 301 when the battery cell 10 is in normal working condition. In other words, the setting of the movable part 32 is beneficial to reducing the ion channel of the battery cell 10 under normal working condition, improving the working stability of the battery cell 10 and extending the service life of the battery cell 10.

[0130] It should be noted that the movable portion 32 described in the embodiment of the present application can be maintained in a state of blocking the through hole 301, which means that the movable portion 32 can completely block the through hole 301 in this state, making it difficult for the through hole 301 to conduct substances such as the electrolyte. Of course, the state in which the movable portion 32 blocks the through hole 301 can also mean that although the movable portion 32 opens the through hole 301 in this state, the movable portion 32 has a certain resistance to the through hole 301 conducting the electrolyte and other substances. For example, the movable portion 32 overlaps with the orthographic projection of the through hole 301, so that there is a certain obstruction to the flow of substances such as the electrolyte from the through hole 301.

[0131] In some embodiments, as Figure 6As shown, the movable portion 32 is integrally formed with the main body 31. It should be noted that the term "integrated forming" means that the movable portion 32 and the main body 31 can be made of a single piece of material, or the movable portion 32 and the main body 31 can be formed from the same sheet of material. For example, the surface of the insulating film 3 can be cut along a predetermined path so that a portion of the insulating film 3 is disconnected from the main body 31, thereby forming a movable movable portion 32.

[0132] The embodiment of the present application adopts an integrated molding method to set the movable portion 32 and the main body 31, which is beneficial to improving the processing efficiency of the insulating film 3 and reducing the molding difficulty of the movable portion 32, thereby improving the reliability of the connection area 13 and the battery cell 10 and increasing the production capacity of the battery cell 10.

[0133] In some embodiments, reference Figure 8 As shown, the material of the pressure relief area 30 is different from that of the main body 31, wherein the melting point of the pressure relief area 30 is lower than that of the main body 31. In other words, the pressure relief area 30 in the embodiment of the present application can be distinguished from the embodiment in which the through hole 301 is provided, and the pressure relief area 30 is made of a different material from that of the main body 31, so that the melting point of the pressure relief area 30 is lower than that of the main body 31.

[0134] It should be noted that the embodiment of the present application does not limit the material type of the pressure relief zone 30 and the main body 31, as long as the material of the pressure relief zone 30 and the main body 31 can meet the insulation requirements and the melting point of the pressure relief zone 30 is lower than the melting point of the main body 31.

[0135] It should be noted that the embodiment of the present application does not limit the connection form between the pressure relief zone 30 and the main body 31, as long as the relative position of the pressure relief zone 30 and the main body 31 can be stabilized.

[0136] Before the battery cell 10 produces gas, it is difficult for the electrolyte and other substances to pass through the pressure relief area 30, which is beneficial to reducing the ion channels of the insulating film 3 and improving the working efficiency of the battery cell 10; after the battery cell 10 produces gas, the gas can melt the pressure relief area 30 with a low melting point to form a channel for conducting gas in the pressure relief area 30, thereby reducing the risk of pressure buildup inside the insulating film 3 during the gas production process of the battery cell 10.

[0137] In the embodiment of the present application, by setting the melting point of the pressure relief zone 30 to be lower than the melting point of the main body, in the state of thermal runaway, high-temperature gas is generated inside the insulating film 3, and the gas melts the pressure relief zone 30 with a low melting point first, so that the gas can be conducted from the inside of the insulating film 3 to the outside of the insulating film 3 through the melted pressure relief zone 30, thereby reducing the risk of internal pressure buildup.

[0138] In some embodiments, Figure 7 FIG. 3 is a top view of the insulating film 3 in one embodiment. Figure 7As shown, the thickness of the pressure relief area 30 is less than that of the body 31. The definition of thickness in the embodiment of the present application is consistent with that in the above embodiment, and both refer to the size of the insulating film 3 in the inner and outer directions.

[0139] In the embodiment of the present application, the thickness of the pressure relief area 30 in the insulating film 3 is set to be smaller than the thickness of the main body 31. When the main body 31 and the pressure relief area 30 are made of the same material, the structural strength of the pressure relief area 30 is smaller than that of the main body 31. When the gas production is constant, the gas is more likely to break through the pressure relief area 30 with weak structural strength to be conducted to the outside of the insulating film 3, thereby reducing the risk of pressure accumulation inside the insulating film 3.

[0140] In some embodiments, as Figure 7 As shown, the thickness of the pressure relief zone 30 is greater than 0 and less than 0.1 mm. In some embodiments, the thickness of the body 31 is set to 0.1 mm-0.5 mm. In the embodiment of the present application, by setting the thickness of the pressure relief zone 30 to be greater than 0 and less than 0.1 mm, it is beneficial to achieve the effect of reducing the ion channel of the insulating film 3 under the normal working state of the battery cell 10, and also achieve the pressure relief effect when the battery cell 10 is in the gas production state.

[0141] In some embodiments, as Figure 7 In the illustrated embodiment, the thickness of the pressure relief area 30 is set to be smaller than that of the body 31, and the melting point of the pressure relief area 30 is lower than that of the body 31. In other words, the material of the body 31 and the material of the pressure relief area 30 in this embodiment can be differentiated. By reducing the thickness of the pressure relief area 30 and lowering its melting point, when the electrode assembly 2 generates gas, the pressure relief area 30 can be breached more quickly, thereby increasing the speed of pressure relief and reducing the spread of risks to the battery cells 10.

[0142] It should be noted that the embodiment of the present application does not limit the installation method of the insulating film 3. Specifically, during the installation of the battery cell 10, the insulating film 3 is usually wrapped around the outside of the electrode assembly 2 in a ring-shaped or U-shaped manner. The following examples illustrate the overmolding methods of the centralized insulating film 3:

[0143] In some embodiments, as Figure 5 As shown, the insulating film 3 is wrapped around the electrode assembly 2 once, with the starting and ending points of the winding of the insulating film 3 coinciding. In other words, the insulating film 3 is annularly wrapped around the outside of the electrode assembly 2. The electrode assembly 2 in this embodiment typically uses a side-exit tab method, where the tab is led out from the side of the battery cell 10. It can then be guided to the top of the battery cell 10 through components such as an adapter, and connected to the terminal post through the adapter.

[0144] It should be noted that when the insulating film 3 is in a ring-shaped form and covers the outer side of the electrode assembly 2, the pressure relief zone 30 can be set at any position of the insulating film 3, as long as the position of the pressure relief zone 30 can avoid the position of the connection zone 13.

[0145] In some embodiments, as Figure 8 As shown, multiple groups of pressure relief areas 30 are provided. For example, taking the pressure relief areas 30 as through holes 301 as an example, each group of pressure relief areas 30 can be provided as one or more through holes 301, and the pressure relief areas 30 can be provided as multiple groups. Multiple groups means two or more groups. In the implementation of this application, the multiple groups of pressure relief areas 30 can be respectively provided corresponding to two opposite second surfaces 112, or the multiple groups of pressure relief areas 30 can be provided only corresponding to the same second surface 112, that is, multiple groups of pressure relief areas 30 are provided at positions corresponding to the same second surface 112.

[0146] The embodiment of the present application provides multiple groups of pressure relief zones 30 , which is beneficial to increasing the conduction efficiency of gas production of the electrode assembly 2 and dispersing the gas to reduce the risk of gas accumulation at specific locations, thereby reducing the risk of thermal runaway of the electrode assembly 2 .

[0147] In some embodiments, as Figures 8-10 As shown, the insulating film 3 is at least partially overlapped on the side of the housing 11 to form an overlapping area 34. It should be noted that the overlapping area 34 can be formed in a ring-shaped insulating film 3 wrapping form or a U-shaped wrapping form. Figures 8-10 The insulating film 3 in the embodiment shown is in a U-shaped wrapping form. In the annular wrapping form, the wrapping end point of the insulating film 3 exceeds the wrapping start point and then continues wrapping, so that an overlapping area is formed between the wrapping start point and the wrapping end point.

[0148] Reference Figures 8-10 As shown, the method of setting the pressure relief zone is explained by taking the U-shaped coating as an example. There are at least two layers of insulating film 3 in the overlapping area 34 of the insulating film 3, that is, the thickness of the overlapping area 34 is greater than the thickness of other areas, and the thickness of the overlapping area 34 represents the total thickness of all layers of insulating film 3 in the overlapping area 34. In the embodiment of the present application, the pressure relief zone 30 is set in the overlapping area 34. It can be understood that the pressure relief zone 30 can be set on any insulating film 3 in the overlapping area 34, that is, the pressure relief zone 30 can be set on each layer of insulating film 3 in the overlapping area 34, and the pressure relief zone 30 can also be set on any insulating film 3 in the overlapping area 34.

[0149] In the embodiment of the present application, the pressure relief area 30 is set in the overlapping area 34 of the insulating film 3. The thickness of the overlapping area 34 is greater than the thickness of other areas. During the gas production process of the battery cell 10, the gas is conducted to between the adjacent insulating films 3 through the pressure relief area 30, and then discharged to the outside of the insulating film 3 through the gap between the adjacent insulating films 3, thereby achieving pressure relief of the gas inside the insulating film 3.

[0150] In some embodiments, as Figure 4 As shown, the overlapping region 34 is disposed opposite to the second surface 112 of the housing. It should be noted that the projection of the overlapping region 34 on the second surface 112 may partially overlap or completely overlap, as long as the overlapping region 34 is completely within the projection range of the second surface 112.

[0151] During the cyclic expansion of the battery cell 10, affected by the arrangement of the pole pieces in the electrode assembly 2, the electrode assembly 2 usually expands and contracts in the direction in which the two first surfaces 111 are relatively set. For example, during the expansion process, the electrode assembly 2 will increase in size in the direction in which the two first surfaces 111 are relatively set, so that the electrode assembly 2 squeezes the insulating film 3 on the large surface and the first surface 111 of the shell 11. Therefore, the embodiment of the present application arranges the overlapping area 34 in the area opposite to the second surface 112, and arranges the pressure relief area 30 in the overlapping area 34, so that the arrangement of the pressure relief area 30 avoids the direction in which the two first surfaces 111 of the electrode assembly 2 are relatively set, thereby reducing the interference of the cyclic expansion of the electrode assembly 2 on the pressure relief area.

[0152] In some embodiments, as Figure 8 and Figure 9 As shown, the overlapping region 34 includes at least two layers of insulating films 3, and at least one layer of insulating film 3 is provided with a group of pressure relief areas 30 in the overlapping region 34. It should be noted that the term "at least one layer of insulating film 3" means that only one layer of the multiple insulating films 3 stacked in the overlapping region 34 is provided with a pressure relief area 30. Alternatively, all multiple insulating films 3 in the overlapping region 34 may be provided with a pressure relief area 30. Furthermore, the pressure relief areas 30 provided on the at least one layer of insulating film 3 may be one group or multiple groups.

[0153] In the embodiment of the present application, by providing at least one layer of insulating film 3 in the overlapping area 34 with at least one group of pressure relief areas 30 , the efficiency of gas conduction is improved, thereby reducing the risk of pressure build-up in the electrode assembly 2 .

[0154] In some embodiments, Figure 10 The following is a schematic diagram of the expansion of the insulating film. Figure 10As shown, each insulating film 3 layer in the overlapping region 34 is provided with a set of pressure relief areas 30, wherein the number of groups of pressure relief areas 30 provided on each insulating film 3 can be one or multiple. In the embodiment of the present application, in adjacent insulating films 3 layers within the overlapping region 34, the pressure relief areas 30 of one insulating film 3 are opposite to the position of another insulating film 3 where the pressure relief areas 30 are not provided. In other words, the pressure relief areas 30 of adjacent insulating films 3 layers within the overlapping region 34 are staggered, and the projections of the pressure relief areas 30 of adjacent insulating films 3 in the stacking direction of the overlapping region 34 do not overlap.

[0155] In the embodiment of the present application, each layer of the insulating film 3 in the overlapping area 34 is provided with a group of pressure relief areas 30, which is beneficial to improving the path for the electrolyte to flow from the inside of the insulating film 3 to the outside of the insulating film 3 when the battery cell 10 is in normal working condition, thereby helping to extend the service life of the battery cell 10.

[0156] In some embodiments, as Figure 6 As shown, there are multiple pressure relief zones 30, and the multiple pressure relief zones 30 are spaced apart. It should be noted that the multiple in the embodiment of the present application means two or more, and the spacing means that the pressure relief zones 30 are spaced apart by a certain distance, so that the gas discharged from the multiple pressure relief zones 30 is dispersed.

[0157] The embodiment of the present application provides multiple pressure relief zones 30, and the multiple pressure relief zones 30 are spaced apart, which is beneficial to improving the dispersion of gas extraction and reducing the risk of gas accumulation in specific areas, thereby further reducing the risk of failure at the connection.

[0158] In some embodiments, as Figure 4 As described above, the insulating film 3 forms an opening 35 on one side of the electrode tab 21 of the electrode assembly 2, and the opening 35 faces the cover 12, or the opening 35 faces the side of the shell 11. It should be noted that the opening 35 represents an open gap, and the opening 35 covers the entire side of the insulating film 3, wherein the opening 35 can be formed on the side facing the cover 12, and can also be formed in the direction facing the side of the shell 11. During the pressure relief process, gas can be released from the opening 35 and the pressure relief area 30, so that the released gas is dispersed, which is conducive to reducing the risk of gas pressure buildup.

[0159] In some embodiments, as Figure 4 As shown, the tabs 21 of the electrode assembly 2 extend from the direction close to the cover 12. In other words, the electrode assembly 2 in the embodiment of the present application is configured with the tabs extending from the top. By adopting the top tab configuration, the embodiment of the present application is advantageously used to reduce the length of the adapter plate within the battery cell 10. In this case, the pressure relief area can be provided on the side of the electrode assembly 2, which is advantageously used to reduce interference of the pressure relief member 6 with the connection area 13.

[0160] In some embodiments, as Figure 4 As shown, the battery cell 10 further includes a plastic member 5, which is disposed on a side of the cover 12 near the opening 110, and the insulating film 3 is at least partially fixed to the plastic member 5. It should be noted that the plastic member 5 in the embodiment of the present application serves as insulation and support, wherein the insulating film 3 is at least partially fixed to the plastic member 5 means that a portion of the insulating film 3 is fixed to the plastic member 5 by hot melt or other means, and the other portion of the insulating film 3 may not be connected to the plastic member 5.

[0161] The embodiment of the present application helps to reduce the difficulty of installing the insulating film 3 into the shell 11 by fixing the insulating film 3 at least partially to the plastic part 5, and the insulating film 3 is kept at least partially in a non-connected state with the plastic part 5, which helps to disperse the gas conduction path, thereby reducing the risk of gas pressure in the electrode assembly 2.

[0162] In some embodiments, as Figure 3 and Figure 4 As shown, the battery cell 10 also includes a terminal post 4, which is disposed on the cover 12 and connected to the terminal tab 21. It should be noted that the terminal post 4 in the embodiment of the present application can be directly connected to the terminal tab 21, or indirectly connected to the terminal tab via an adapter. The terminal post 4 can be disposed on the cover 12. In other embodiments, the terminal post 4 can also be disposed on the housing 11.

[0163] In the embodiment of the present application, the pole 4 is provided on the cover 12 , and the pressure relief area 30 is provided away from the cover 12 , which is beneficial to reducing the interference of the pressure relief gas on the pole 4 and also beneficial to reducing the interference of the pressure relief gas on the connection area 13 .

[0164] In some embodiments, as Figure 3 and Figure 4 As shown, there are at least two electrode assemblies 2, and the electrode assemblies 2 include pole pieces and separators. The pole pieces and separators are wound and formed, and adjacent electrode assemblies 2 are arranged side by side, and the insulating film 3 is coated on the outside of the at least two electrode assemblies 2; that is, multiple electrode assemblies 2 can be arranged in the same battery cell 10, and multiple electrode assemblies 2 are coated in the insulating film 3. Multiple electrode assemblies 2 are arranged side by side in the thickness direction, and a gap 20 is formed in the width direction between the side-by-side electrode assemblies 2. The pressure relief area 30 on the insulating film 3 is arranged opposite to the gap 20. It should be noted that the ends of the wound electrode assemblies 2 in the width direction are in an arc-shaped structure. Therefore, after the adjacent electrode assemblies 2 are arranged side by side in the thickness direction, there is a certain gap 20 between the positions where the two electrode assemblies 2 form an arc in the width direction.

[0165] The embodiment of the present application sets the pressure relief zone 30 at a position opposite to the gap 20, which helps to reduce the interference of the electrode assembly 2 on the pressure relief zone 30 during the gas production process of the electrode assembly 2, thereby helping to improve the exhaust efficiency.

[0166] Please refer again Figures 1-10 As an optional solution, the embodiment of the present application provides a battery cell 10, which includes two electrode assemblies 2. A gap 20 can be formed between the two electrode assemblies 2. A plurality of pressure relief areas 30 are respectively provided on the two smaller side surfaces of the peripheral side of the insulating film 3. The pressure relief areas 30 can be connected to the gap 20 to connect the inside and outside of the insulating film 3 to form an exhaust channel. There are many ways to implement the exhaust channel. When thermal runaway of the battery cell occurs, the exhaust channel on the side of the insulating film 3 opens, allowing the internal side of the battery cell to release pressure smoothly, improving the pressure accumulation behavior on the internal side of the battery cell, thereby reducing the probability of failure of the side connection area 13 of the battery cell. Among them, the pressure relief area 30 can be either a through hole 301 or an opening with a movable part 32. A part of the movable part 32 is movable so that it can move when there is too much internal gas to connect the gap 20 and the outside to play a role in exhaust. Of course, it can also be a staggered opening design on the overlapping part of the side of the insulating film 3, so as to increase the degree of electrolyte infiltration in the electrode assembly and also play a certain side exhaust function.

[0167] Through the above-mentioned structural arrangement, during the process of gas production inside the battery cell 10, the gas can be easily discharged from the inner side of the insulating film 3 to the outer side of the insulating film 3 through the pressure relief area 30, thereby improving the pressure buildup phenomenon caused by the failure of gas to dissipate from the insulating film 3 in time, and reducing the possibility of concentrated effects on the local shell 11 due to pressure buildup, so as to improve the reliability of the battery cell 10.

[0168] The present application also provides a battery, comprising a battery cell 10 according to any of the above embodiments. The battery cell 10 in the battery comprises an outer shell 1, an electrode assembly 2, and an insulating film 3. The outer shell 1 comprises a shell 11 and a cover 12. The shell 11 has an opening 110. The cover 12 closes the opening 110. The cover 12 is connected to the periphery of the opening 110 to form a connection area 13. The electrode assembly 2 is disposed within the outer shell 1. The insulating film 3 is coated on the outside of the electrode assembly 2. The insulating film 3 is provided with a pressure relief area 30. The pressure relief area 30 is configured to guide gas generated by the electrode assembly 2 to the outside of the insulating film 3. The pressure relief area 30 avoids the connection area 13. In the embodiment of the present application, a pressure relief area 30 is set on the insulating film 3 so that the structural strength of the pressure relief area 30 is lower than the structural strength of other positions on the insulating film 3. During gas production inside the battery cell 10, the gas is more likely to pass through the pressure relief area 30 from the inside of the insulating film 3 to the outside of the insulating film 3. The pressure relief area 30 in the embodiment of the present application is avoided from the connection area 13. The position setting of the pressure relief area 30 is used to achieve directional discharge of gas. On the one hand, it can increase the channel and path for gas discharge and reduce the risk of gas pressure accumulation inside the insulating film 3; on the other hand, it is beneficial to reduce the risk of gas directly impacting the connection area 13, thereby reducing the accumulation of gas in the connection area 13, so as to improve the reliability of the connection area 13 and the battery cell 10, and further help to improve the stability of the use of the battery cell 10.

[0169] An embodiment of the present application provides an electrical device, comprising a battery cell 10 according to any of the above embodiments, or a battery according to the above embodiments. The battery cell 10 in the electrical device comprises a housing 1, an electrode assembly 2, and an insulating film 3. The housing 1 comprises a shell 11 and a cover 12. The shell 11 has an opening 110. The cover 12 closes the opening 110. The cover 12 is connected to the periphery of the opening 110 to form a connection area 13. The electrode assembly 2 is disposed within the housing 1. The insulating film 3 is coated on the outside of the electrode assembly 2. The insulating film 3 is provided with a pressure relief area 30. The pressure relief area 30 is configured to be able to guide the gas generated by the electrode assembly 2 to the outside of the insulating film 3. The pressure relief area 30 avoids the connection area 13. In the embodiment of the present application, a pressure relief area 30 is set on the insulating film 3 so that the structural strength of the pressure relief area 30 is lower than the structural strength of other positions on the insulating film 3. During gas production inside the battery cell 10, the gas is more likely to pass through the pressure relief area 30 from the inside of the insulating film 3 to the outside of the insulating film 3. The pressure relief area 30 in the embodiment of the present application is avoided from the connection area 13. The position setting of the pressure relief area 30 is used to achieve directional discharge of gas. On the one hand, it can increase the channel and path for gas discharge and reduce the risk of gas pressure accumulation inside the insulating film 3; on the other hand, it is beneficial to reduce the risk of gas directly impacting the connection area 13, thereby reducing the accumulation of gas in the connection area 13, so as to improve the reliability of the connection area 13 and the battery cell 10, and further help to improve the stability of the use of the battery cell 10.

[0170] In addition to the embodiments of the claims above, specific embodiments involving more specific features or their combinations may be preferred and may be shown in the drawings.

[0171] 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: The housing comprises a shell and a cover, wherein the shell comprises a shell body and an opening, wherein the opening is formed by surrounding an opening edge, and the cover comprises a cover edge and a cover body; the cover edge is connected to the opening edge to close the opening; an electrode assembly, disposed in the housing; An insulating film, covering the outer side of the electrode assembly; the insulating film includes a pressure relief area; Wherein, the pressure relief zone is arranged opposite to the shell body main body and / or the cover body main body.

2. The battery cell according to claim 1, wherein: The cover body is welded to the shell body, and a molten pool at the welding position of the cover body and the shell body forms a connection area where the edge of the cover body and the edge of the opening are connected.

3. The battery cell according to claim 2, characterized in that: The insulating film includes a first wall, the pressure relief area is arranged on the first wall, and the first wall avoids the cover body and the connection area.

4. The battery cell according to claim 2, characterized in that: The pressure relief zone faces any wall on the peripheral side of the shell.

5. The battery cell according to claim 4, characterized in that The shell is configured as a square shell, and the circumferential side of the shell has two first surfaces with larger areas and two second surfaces with smaller areas; the pressure relief zone faces at least one of the second surfaces.

6. The battery cell according to claim 5, characterized in that The pressure relief area is arranged at a position opposite to each of the second surfaces.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The pressure relief area is configured as a through hole, and the through hole penetrates two opposite sides of the insulating film in a thickness direction.

8. The battery cell according to claim 7, characterized in that The insulating film includes a body and a movable portion, the pressure relief area is provided on the body, a portion of the movable portion is connected to the body, and another portion of the movable portion can move relative to the body between a position of blocking the through hole and a position of opening the through hole.

9. The battery cell according to claim 8, characterized in that The movable portion and the main body are integrally formed.

10. The battery cell according to claim 8, characterized in that A portion of the movable portion is integrally connected to the body, and another portion of the movable portion is connected to the body via discontinuous / continuous notches; or a portion of the movable portion is integrally connected to the body, and another portion of the movable portion is disconnected from the body.

11. The battery cell according to claim 8, characterized in that The movable portion is square in shape, one side of the movable portion is connected to the main body, and the other three sides of the movable portion are movable relative to the main body.

12. The battery cell according to any one of claims 1 to 6, characterized in that: The portion of the insulating film other than the pressure relief area is the body. The material of the pressure relief area is different from that of the body. The melting point of the pressure relief area is lower than that of the body.

13. The battery cell according to any one of claims 1 to 6, characterized in that: The area on the insulating film except the pressure relief area is the body, and the thickness of the pressure relief area is smaller than the thickness of the body.

14. The battery cell according to claim 13, characterized in that The thickness of the pressure relief zone is greater than 0 and less than 0.1 mm.

15. The battery cell according to claim 13, characterized in that The melting point of the pressure relief zone is lower than the melting point of the body.

16. The battery cell according to any one of claims 1 to 6, characterized in that: The insulating film is at least partially stacked on a side of the housing to form an overlapping area. The thickness of the overlapping area is greater than that of other areas. The pressure relief area is provided in the overlapping area.

17. The battery cell according to claim 16, characterized in that The overlapping region includes at least two layers of insulating films, and at least one of the at least two layers of insulating films is provided with the pressure relief region.

18. The battery cell according to claim 16, characterized in that Each insulating film layer in the overlapping area is provided with a pressure relief area, and in adjacent insulating films, the pressure relief area of ​​one insulating film is opposite to a position of another insulating film where no pressure relief area is provided.

19. The battery cell according to any one of claims 1 to 6, characterized in that: There are multiple pressure relief zones, and the multiple pressure relief zones are arranged at intervals.

20. The battery cell according to any one of claims 1 to 6, characterized in that: The insulating film forms an opening on one side of the electrode assembly tab, and the opening faces the cover, or the opening faces the side of the shell.

21. The battery cell according to claim 20, characterized in that The battery cell further comprises: A plastic component is arranged on a side of the cover body close to the opening, and the insulating film is at least partially fixed to the plastic component.

22. The battery cell according to any one of claims 1 to 6, characterized in that: The battery cell further comprises: The pole is arranged on the cover body, and the pole is electrically connected to the electrode assembly.

23. The battery cell according to any one of claims 1 to 6, characterized in that: There are at least two electrode assemblies, each comprising a pole piece and a separator, wherein the pole piece and the separator are wound together, adjacent electrode assemblies are arranged side by side, and an insulating film is coated on the outside of the at least two electrode assemblies; A gap is formed between the electrode assemblies arranged side by side in the width direction, and the pressure relief area on the insulating film is arranged opposite to the gap.

24. A battery, characterized in that: include: A battery cell according to any one of claims 1 to 23.

25. An electrical device, characterized in that: include: The battery cell according to any one of claims 1 to 23, or the battery according to claim 23.

Images