Battery monomer, battery and electric device

Abstract

The utility model relates to the field of batteries, and provides a battery monomer, a battery and a power utilization device. The battery cell includes an electrode assembly. The electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm, and the positive pole piece, the diaphragm and the negative pole piece are stacked. The membrane includes a membrane body. A protruding part is arranged on at least one side surface of the film body. The protruding part comprises a plurality of strip-shaped bodies. Every two adjacent strip-shaped bodies are arranged at intervals, and gaps between the strip-shaped bodies form flow guide channels. Based on the structure, under the condition of thermal runaway of the battery monomers, heat and gas circulation and heat and gas export from the electrode assembly can be facilitated through the strip-shaped diversion channels which are distributed at intervals of the diaphragm, so that heat conduction, gas exhaust and pressure relief can be performed quickly, the risk that heat and gas are accumulated on the electrode assembly can be reduced, the thermal failure speed can be delayed, and the service life of the battery is prolonged. The thermal failure reaction and thermal failure diffusion can be relieved, the controllability of thermal failure can be enhanced, and the use reliability of the battery monomer can be improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery cell, a battery and an electrical device. Background Art

[0002] The electrode assembly is a component in the battery cell where electrochemical reactions occur. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator that separates the positive electrode plate and the negative electrode plate. However, the positive electrode plate, the negative electrode plate, and the separator are stacked and closely abutted, resulting in difficulty in heat conduction, exhaust, and pressure relief of the electrode assembly in the case of thermal runaway of the battery cell. As a result, heat and gas are likely to accumulate in the electrode assembly, which will exacerbate the thermal failure reaction. Utility Model Content

[0003] The embodiments of this application provide a battery cell, a battery and an electrical device, aiming to solve the problem that it is difficult for the electrode assembly to conduct heat, exhaust, and relieve pressure in the case of thermal runaway of the battery cell, resulting in heat and gas being likely to accumulate in the electrode assembly, which will exacerbate the thermal failure reaction.

[0004] To achieve the above object, the technical solution adopted in the embodiments of this application is:

[0005] In a first aspect, a battery cell is provided. The battery cell includes an electrode assembly. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate, the separator, and the negative electrode plate are stacked.

[0006] The separator includes a film body, and convex portions are provided on at least one surface of the film body. The convex portions include a plurality of strip-shaped bodies, and adjacent two strip-shaped bodies are spaced apart, and the gaps therebetween form flow guide channels.

[0007] For the battery cell provided by the embodiments of this application, during the normal use of the battery cell, the film body and the convex portions of the separator, especially the strip-shaped bodies and the flow guide channels arranged at intervals on the convex portions, can promote better adhesion and liquid retention ability between the separator and the positive electrode plate and the negative electrode plate, so as to optimize the performance of the battery cell. In the case of thermal runaway of the battery cell, the strip-shaped and spaced flow guide channels of the separator can facilitate the flow of heat and gas, facilitate the export of heat and gas from the electrode assembly, and even direct the discharge of the battery cell, so as to quickly conduct heat, exhaust, and relieve pressure, reduce the risk of heat and gas accumulation in the electrode assembly, reduce the risk of exacerbating the thermal failure reaction due to local overheating and local accumulation of high-pressure gas in the electrode assembly, delay the thermal failure speed, relieve the thermal failure reaction and thermal failure diffusion, enhance the controllability of thermal failure, and improve the use reliability of the battery cell.

[0008] In some embodiments, the battery cell further includes a pressure relief mechanism;

[0009] The separator includes a plurality of functional regions arranged in sequence along its extending direction, and the plurality of functional regions include a first region, and the first region is arranged corresponding to the pressure relief mechanism along the center line of the pressure relief mechanism;

[0010] Among the functional regions, the area of the protruding portion of the first region is the smallest.

[0011] By adopting the above scheme, the separator can have a first region arranged corresponding to the pressure relief mechanism, and the area of the protruding portion of the first region is made the smallest, so that the adhesion between the first region and the positive electrode sheet and the negative electrode sheet is weak, and the area of the diversion channel of the first region is the largest. Based on this, in the case of thermal runaway of the battery cell, the first region arranged corresponding to the pressure relief mechanism can provide the largest number and area of diversion channels to quickly direct heat and gas to the pressure relief mechanism, thereby providing an efficient directional release path for heat and gas, enabling rapid heat conduction, exhaust, and pressure relief, reducing the risk of heat and gas accumulation in the electrode assembly, delaying the thermal failure speed, alleviating the thermal failure reaction and thermal failure diffusion, enhancing the controllability of thermal failure, and improving the use reliability of the battery cell.

[0012] In some embodiments, the first region includes a plurality of functional sub-regions arranged in sequence along the direction close to the pressure relief mechanism; the area of the protruding portion of the functional sub-region closer to the pressure relief mechanism is smaller.

[0013] By adopting the above scheme, in the first region, the area of the protruding portion of the functional sub-region closer to the pressure relief mechanism is made smaller, so that the adhesion between the functional sub-region closer to the pressure relief mechanism and the electrode sheets (i.e., the positive electrode sheet and the negative electrode sheet) is weaker, and the area of the diversion channel of the functional sub-region closer to the pressure relief mechanism is larger. Based on this, during the normal use of the battery cell, the functional sub-region farther from the pressure relief mechanism can form a better adhesion with the electrode sheets and has a better liquid retention capacity, thereby maintaining the performance of the battery cell. In the case of thermal runaway of the battery cell, the functional sub-region closer to the pressure relief mechanism can provide a larger number and area of diversion channels, can temporarily store and conduct out more heat and gas, and can direct more heat and gas to the pressure relief mechanism faster, thereby realizing heat conduction, exhaust, and pressure relief from the pressure relief mechanism progressively and efficiently, facilitating the directional release of heat and gas, reducing the risk of heat and gas accumulation in the electrode assembly, delaying the thermal failure speed, alleviating the thermal failure reaction and thermal failure diffusion, enhancing the controllability of thermal failure, and improving the use reliability of the battery cell.

[0014] In some embodiments, the plurality of functional sub-regions include a first sub-region and a second sub-region, the second sub-region is arranged on the side of the first sub-region closer to the pressure relief mechanism, the first sub-region is provided with a protruding portion, and the area of the protruding portion of the second sub-region is 0.

[0015] By adopting the above solution, the first region can be divided such that the first sub-region relatively far from the pressure relief mechanism is provided with a protrusion, and the second sub-region relatively close to the pressure relief mechanism is not provided with a protrusion, so that the area of the protrusion in the second sub-region is smaller than the area of the protrusion in the first sub-region, and the area of the flow guiding channel in the second sub-region is larger than the area of the flow guiding channel in the first sub-region. Based on this, during the normal use of the battery cell, a better bonding property can be formed between the first sub-region with the protrusion and the electrode tab, and it has a better liquid retention ability, thereby maintaining the performance of the battery cell. In the case of thermal runaway of the battery cell, part of the heat and gas can be temporarily stored through the flow guiding channel in the first sub-region and guided to the second sub-region, and a large amount of heat and gas can be mainly temporarily stored through the large-area flow guiding channel in the second sub-region and guided to the pressure relief mechanism quickly. Thus, efficient heat conduction, exhaust, and pressure relief can be achieved, the directional release of heat and gas can be facilitated, the risk of heat and gas accumulation in the electrode assembly can be reduced, the thermal failure speed can be delayed, the thermal failure reaction and thermal failure diffusion can be alleviated, the controllability of thermal failure can be enhanced, and the use reliability of the battery cell can be improved.

[0016] In some embodiments, the multiple functional regions include a first region and a second region. The second region is disposed on the side of the first region close to the pressure relief mechanism. The first region is provided with a protrusion, and the second region is provided with a protrusion. The area of the protrusion in the second region is smaller than the area of the protrusion in the first region.

[0017] By adopting the above solution, the first region can be divided into a first sub-region and a second sub-region along the direction close to the pressure relief mechanism, and by making both the first sub-region and the second sub-region provided with protrusions, and the area of the protrusion in the second sub-region is smaller than the area of the protrusion in the first sub-region, so that the area of the protrusion in the second sub-region is smaller than the area of the protrusion in the first sub-region, and the area of the flow guiding channel in the second sub-region is larger than the area of the flow guiding channel in the first sub-region. Based on this, during the normal use of the battery cell, different strength bonding properties can be formed between the first sub-region and the second sub-region and the electrode tab respectively, which can promote a better liquid retention ability between the first region and the electrode tab, thereby maintaining the performance of the battery cell. In the case of thermal runaway of the battery cell, heat and gas can be temporarily stored through the flow guiding channel in the first sub-region and guided to the second sub-region, and more heat and gas can be temporarily stored through the flow guiding channel in the second sub-region and guided to the pressure relief mechanism quickly. Thus, efficient heat conduction, exhaust, and pressure relief can be achieved, the directional release of heat and gas can be facilitated, the risk of heat and gas accumulation in the electrode assembly can be reduced, the thermal failure speed can be delayed, the thermal failure reaction and thermal failure diffusion can be alleviated, the controllability of thermal failure can be enhanced, and the use reliability of the battery cell can be improved.

[0018] In some embodiments, the strip-shaped bodies in the first region include first strip-shaped bodies and second strip-shaped bodies arranged alternately. The first strip-shaped bodies extend in the direction close to the pressure relief mechanism in the first partition and the second partition, and the second strip-shaped bodies extend in the direction close to the pressure relief mechanism in the first partition.

[0019] By adopting the above solution, in the first region, the first strip-shaped bodies can extend in the direction close to the pressure relief mechanism in the first partition and the second partition, and the second strip-shaped bodies can extend in the direction close to the pressure relief mechanism in the first partition, so that the first partition has the first strip-shaped bodies and the second strip-shaped bodies, and the second partition only has the second strip-shaped bodies. Based on this, the layout of the strip-shaped bodies in the first partition and the second partition can be optimized, and convex portions with different areas can be conveniently and quickly formed in the first partition and the second partition. It can conveniently and accurately make the area of the convex portion in the second partition smaller than that in the first partition, and even accurately control the area ratio of the convex portions in the first partition and the second partition. It can conveniently and accurately make the area of the diversion channel in the second partition larger than that in the first partition, and even accurately control the area ratio of the diversion channels in the first partition and the second partition.

[0020] In some embodiments, the extending direction of the strip-shaped bodies in the first region is parallel to the center line of the pressure relief mechanism.

[0021] By adopting the above solution, by making the extending direction of the strip-shaped bodies in the first region parallel to the center line of the pressure relief mechanism, the extending direction of the diversion channel in the first region can be made parallel to the center line of the pressure relief mechanism. Based on this, it is convenient for the diversion channel in the first region to direct heat and gas to the pressure relief mechanism quickly and directly along a shorter path, thereby optimizing the guiding effect of the diversion channel in the first region on heat and gas and facilitating the directional release of heat and gas.

[0022] In some embodiments, the multiple functional regions include a second region, and the second region is arranged offset from the pressure relief mechanism along the center line of the pressure relief mechanism;

[0023] The extending direction of the strip-shaped bodies in the second region points to the pressure relief mechanism and is inclined to the center line of the pressure relief mechanism.

[0024] By adopting the above solution, the diaphragm can be provided with a second region that is misaligned with the pressure relief mechanism, and the strip-shaped bodies in the second region are inclinedly directed towards the pressure relief mechanism, so that the diversion channels in the second region are also inclinedly directed towards the pressure relief mechanism. Based on this, during the normal use of the battery cell, the second region misaligned with the pressure relief mechanism can, via the strip-shaped bodies inclinedly directed towards the pressure relief mechanism, have better adhesion and liquid retention ability between the second region and the electrode plate, thereby optimizing the performance of the battery cell. In the case of thermal runaway of the battery cell, the second region misaligned with the pressure relief mechanism can, via the diversion channels inclinedly directed towards the pressure relief mechanism, guide heat and gas quickly towards the pressure relief mechanism, thereby optimizing the guiding effect of the diversion channels in the second region on heat and gas, facilitating the directional release of heat and gas, reducing the risk of heat and gas accumulation in the electrode assembly, delaying the thermal failure speed, alleviating the thermal failure reaction and thermal failure diffusion, enhancing the controllability of thermal failure, and improving the use reliability of the battery cell.

[0025] In some embodiments, the plurality of functional regions include a second region, and the second region is misaligned with the pressure relief mechanism along the center line of the pressure relief mechanism;

[0026] The second region includes a third partition and a fourth partition arranged in sequence along the direction close to the pressure relief mechanism; the extending direction of the strip-shaped bodies in the third partition points to the pressure relief mechanism and is inclined to the center line of the pressure relief mechanism; the extending direction of the strip-shaped bodies in the fourth partition is perpendicular to the center line of the pressure relief mechanism.

[0027] By adopting the above solution, the second region can make the strip-shaped bodies in the third partition inclinedly point to the pressure relief mechanism, so that the diversion channels in the third partition are inclinedly directed towards the pressure relief mechanism. The second region can also make the extending direction of the strip-shaped bodies in the fourth partition perpendicular to the center line of the pressure relief mechanism, so that the diversion channels in the fourth partition are directed towards the center line of the pressure relief mechanism and thus towards the pressure relief mechanism. Based on this, during the normal use of the battery cell, the second region misaligned with the pressure relief mechanism can, via the strip-shaped bodies in the third partition inclinedly directed towards the pressure relief mechanism and the strip-shaped bodies in the fourth partition perpendicular to the center line of the pressure relief mechanism, jointly promote better adhesion and liquid retention ability between the second region and the electrode plate, thereby optimizing the performance of the battery cell. In the case of thermal runaway of the battery cell, the second region misaligned with the pressure relief mechanism can, via the diversion channels in the third partition inclinedly directed towards the pressure relief mechanism and the diversion channels in the fourth partition perpendicular to the center line of the pressure relief mechanism, jointly guide heat and gas quickly towards the pressure relief mechanism, thereby optimizing the guiding effect of the diversion channels in the second region on heat and gas, facilitating the directional release of heat and gas, reducing the risk of heat and gas accumulation in the electrode assembly, delaying the thermal failure speed, alleviating the thermal failure reaction and thermal failure diffusion, enhancing the controllability of thermal failure, and improving the use reliability of the battery cell.

[0028] In some embodiments, two second regions respectively disposed on opposite sides of the first region are symmetrically arranged.

[0029] By adopting the above solution, by making two second regions respectively disposed on opposite sides of the first region and adjacent to the first region symmetrically arranged with respect to the first region, the strip-shaped bodies of the two second regions can be symmetrically arranged with respect to the first region, and the diversion channels of the two second regions can be symmetrically arranged with respect to the first region. Based on this, during the normal use of the battery cell, the adhesiveness and liquid retention ability of the two second regions can be relatively balanced, thereby optimizing the performance of the battery cell in a balanced manner. In the case of thermal runaway of the battery cell, the two second regions can respectively guide heat and gas in opposite directions to the pressure relief mechanism quickly through the symmetrically arranged diversion channels, so as to optimize the guiding effect of the two second regions on heat and gas in a balanced manner, and facilitate the directional release of heat and gas.

[0030] In a second aspect, a battery is provided, and the battery includes the battery cell provided in the embodiments of the present application.

[0031] By adopting the above solution, the battery can optimize the performance and use reliability of the battery by applying the battery cell provided in the embodiments of the present application.

[0032] In a third aspect, an electrical device is provided, and the electrical device includes the battery provided in the embodiments of the present application, or the battery cell provided in the embodiments of the present application.

[0033] By adopting the above solution, the electrical device can optimize the performance and use reliability of the electrical device by applying the battery or battery cell provided in the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0036] Figure 2 It is an exploded view of a battery provided in some embodiments of the present application;

[0037] Figure 3 It is an exploded view of a battery cell provided in some embodiments of the present application;

[0038] Figure 4 It is a schematic structural diagram of an electrode assembly provided in some embodiments of the present application;

[0039] Figure 5 Side view of the diaphragm provided for some embodiments of the present application;

[0040] Figure 6 Front view of the diaphragm provided for some embodiments of the present application, wherein the pressure relief mechanism is intended to be provided on the lower side of the diaphragm, the first region includes a first sub-region and a second sub-region, the area of the protruding portion of the second sub-region is 0, and the extending direction of the strip-shaped body in the second region points to the pressure relief mechanism and is inclined to the center line of the pressure relief mechanism;

[0041] Figure 7 Front view of the diaphragm provided for some other embodiments of the present application, wherein the pressure relief mechanism is intended to be provided on the lower side of the diaphragm, the first region includes a first sub-region and a second sub-region, the area of the protruding portion of the second sub-region is smaller than the area of the protruding portion of the first sub-region, and the extending direction of the strip-shaped body in the second region points to the pressure relief mechanism and is inclined to the center line of the pressure relief mechanism;

[0042] Figure 8 Front view of the diaphragm provided for some other embodiments of the present application, wherein the pressure relief mechanism is intended to be provided on the lower side of the diaphragm, the first region includes a first sub-region and a second sub-region, the area of the protruding portion of the second sub-region is 0, and the second region includes a third sub-region and a fourth sub-region;

[0043] Figure 9 Front view of the diaphragm provided for some other embodiments of the present application, wherein the pressure relief mechanism is intended to be provided on the lower side of the diaphragm, the first region includes a first sub-region and a second sub-region, the area of the protruding portion of the second sub-region is smaller than the area of the protruding portion of the first sub-region, and the second region includes a third sub-region and a fourth sub-region.

[0044] Wherein, each reference numeral in the figure:

[0045] 1 - battery, 2 - controller, 3 - motor; 100 - battery unit, 200 - box body, 201 - first part, 202 - second part;

[0046] 10 - Battery cell, 11 - Housing, 111 - Shell, 112 - End cap; 12 - Electrode assembly, 121 - Electrode body, 122 - Tab, 122a - Positive tab, 122b - Negative tab, 123 - Positive electrode plate, 124 - Negative electrode plate, 125 - Separator, 1251 - Membrane body, 1252 - Protrusion, 12521 - Strip, 12521a - First strip, 12521b - Second strip, 12522 - Flow channel, 1253 - Functional area, 1253a - First area, 12531 - Functional sub - area, 12531a - First sub - area, 12531b - Second sub - area, 1253b - Second area, 12532 - Third sub - area, 12533 - Fourth sub - area; 13 - Insulator; 14 - Electrode terminal, 14a - Positive electrode terminal, 14b - Negative electrode terminal; 15 - Adapter, 15a - Positive adapter, 15b - Negative adapter; 16 - Pressure relief mechanism, L - Center line of the pressure relief mechanism, a - Extension direction of the separator, b - Direction close to the pressure relief mechanism, z - Thickness direction of the membrane body. Detailed implementation mode

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clear and understandable, the following describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0048] In the description of this application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0050] In this application, unless otherwise clearly specified or limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] A battery cell is the smallest unit for storing and outputting electric energy. The battery cell includes an electrode assembly, and the electrode assembly is the component in the battery cell where an electrochemical reaction occurs. The electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator that separates the positive electrode tab and the negative electrode tab.

[0052] However, the positive electrode tab, the negative electrode tab, and the separator are stacked and closely abutted, resulting in difficulty in heat conduction, exhaust, and pressure relief of the electrode assembly in the case of thermal runaway of the battery cell. As a result, heat and gas are easily accumulated in the electrode assembly, causing the local temperature of the electrode assembly to be too high and high-pressure gas to be locally accumulated, thereby exacerbating the thermal failure reaction.

[0053] Therefore, some embodiments of the present application provide a battery cell. During the normal use of the battery cell, through the membrane body and the protruding part of the separator, especially through the strip-shaped bodies and the diversion channels arranged at intervals on the protruding part, the separator can have better adhesiveness and liquid retention ability with the positive electrode tab and the negative electrode tab, thereby optimizing the performance of the battery cell. In the case of thermal runaway of the battery cell, through the strip-shaped and spaced diversion channels of the separator, heat and gas can flow easily, and heat and gas can be easily exported from the electrode assembly, and even discharged out of the battery cell directionally. Therefore, heat conduction, exhaust, and pressure relief can be quickly achieved, the risk of heat and gas accumulation in the electrode assembly can be reduced, the risk of exacerbating the thermal failure reaction of the electrode assembly due to local overheating and local accumulation of high-pressure gas can be reduced, the thermal failure speed can be delayed, the thermal failure reaction and thermal failure diffusion can be alleviated, the controllability of thermal failure can be enhanced, and the use reliability of the battery cell can be improved.

[0054] The battery cell disclosed in the embodiments of the present application can be a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc. The battery cell can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc. The battery cell can adopt different packaging methods to form a cylindrical battery cell, a square battery cell, a soft-pack battery cell, etc.

[0055] The battery cell disclosed in the embodiments of the present application can be used independently or can be combined with other battery cells to form a modular battery that can provide higher voltage and capacity, such as a battery module, a battery module group, or a battery pack.

[0056] The battery cells and batteries disclosed in the embodiments of the present application can be used in electrical devices that use the battery cells and batteries as power sources, or in various energy storage systems that use the battery cells and batteries as energy storage elements. The electrical device can be, but is not limited to, a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc. The electric toy includes a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and a planer, etc.

[0057] In order to illustrate the technical solutions provided by the present application, the following will be described in detail with reference to specific drawings and embodiments, taking "the electrical device is a vehicle" as an example.

[0058] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle provided by some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 1 is disposed inside the vehicle, and the battery 1 can be disposed at the bottom, the head, or the tail of the vehicle. The battery 1 is used to supply power to the vehicle. For example, the battery 1 can be used as the operating power source of the vehicle. The vehicle may further include a controller 2 and a motor 3. The controller 2 is used to control the battery 1 to supply power to the motor 3, for example, for the working power requirements during the start, navigation, and driving of the vehicle.

[0059] In some embodiments of the present application, the battery 1 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0060] Please refer to Figure 2 , Figure 2Exploded schematic view of the battery 1 provided by some embodiments of the present application. The battery 1 includes a battery cell 100 and a box body 200, and the battery cell 100 is accommodated in the box body 200. Among them, the box body 200 is used to provide an accommodation space for the battery cell 100, and the box body 200 can adopt various structures. In some embodiments, the box body 200 may include a first part 201 and a second part 202, the first part 201 and the second part 202 are covered with each other, and the first part 201 and the second part 202 jointly define an accommodation space for accommodating the battery cell 100. The second part 202 may be a hollow structure with one end open, and the first part 201 may be a plate-like structure. The first part 201 covers the open side of the second part 202 so that the first part 201 and the second part 202 jointly define an accommodation space; the first part 201 and the second part 202 may also both be hollow structures with one side open, and the open side of the first part 201 covers the open side of the second part 202. Of course, the box body 200 formed by the first part 201 and the second part 202 can be of various shapes, such as a cylinder, a cuboid, etc.

[0061] In the battery 1, there may be at least two battery cells 100, and at least two battery cells 100 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among at least two battery cells 100.

[0062] Specifically, the battery cell 100 may be a battery monomer 10 (as Figure 3 shown). At least two battery monomers 10 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by at least two battery monomers 10 is accommodated in the box body 200. Among them, the battery monomer 10 may be a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc. The battery monomer 10 may be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The battery monomer 10 may adopt different packaging methods to form a cylindrical battery monomer, a square battery monomer, a soft-pack battery monomer, etc.

[0063] Or, the battery cell 100 may be a battery module or a battery pack. At least two battery monomers 10 can be first connected in series, in parallel, or in a mixed connection to form a modular structure, that is, a battery module or a battery pack; at least two battery modules or battery packs are then connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 200.

[0064] Of course, the battery 1 may further include other structures. For example, the battery 1 may further include a busbar component (not shown in the figure) for realizing the electrical connection between at least two battery cells 100.

[0065] Of course, in some embodiments, the battery 1 may not include the box body 200 , but at least two battery cells 10 may be electrically connected and formed into a whole through necessary fixing structures before being assembled into an electrical device.

[0066] See also Figure 3 、 Figure 4 , Figure 3 This is an exploded schematic diagram of a battery cell 10 provided in some embodiments of the present application. Figure 4 This is a schematic diagram of the structure of an electrode assembly 12 provided in some embodiments of the present application. A battery cell 10 is the smallest unit for storing and outputting electrical energy. The battery cell 10 includes a housing 11, an electrode assembly 12, an insulator 13, electrode terminals 14, an adapter 15, a pressure relief mechanism 16, and an electrolyte (not shown).

[0067] The outer shell 11 is a component that isolates the internal environment of the battery cell 10 from the external environment. The outer shell 11 may include a shell 111 and an end cover 112. The end cover 112 is a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 10 from the external environment. In some embodiments, the shape of the end cover 112 can be adapted to the shape of the shell 111 to match the shell 111. In some embodiments, the end cover 112 can be made of a material with a certain hardness and strength, so that the end cover 112 is not easily deformed when squeezed and collided, so that the battery cell 10 can have a higher structural strength and the safety performance can also be improved. Among them, the material of the end cover 112 can be diversified, and the end cover 112 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic and other materials.

[0068] The shell 111 is a component used to cooperate with the end cover 112 to form the internal environment of the battery cell 10. The internal environment formed by the shell 111 and the end cover 112 can be used to accommodate components such as the electrode assembly 12, the insulating member 13, and the electrolyte. In some embodiments, the shell 111 and the end cover 112 can be independent components, and an opening can be provided on the shell 111. The internal environment of the battery cell 10 is formed by covering the opening with the end cover 112. In some embodiments, the end cover 112 and the shell 111 can also be integrated. Specifically, the end cover 112 and the shell 111 can form a common connection surface before other components are put into the shell. When the interior of the shell 111 needs to be encapsulated, the end cover 112 is covered with the shell 111. Among them, the shell 111 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, a hexagonal prism, etc. The shape of the shell 111 can be determined according to the shape and size of the electrode assembly 12. The material of the housing 111 can be varied, and the housing 111 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and other materials.

[0069] The electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. The housing 11 may include one or at least two electrode assemblies 12. The electrode assembly 12 includes a positive electrode tab 123, a negative electrode tab 124, and a separator 125, and the separator 125 separates the positive electrode tab 123 and the negative electrode tab 124. The positive electrode tab 123, the separator 125, and the negative electrode tab 124 can be processed in a winding manner, a stacking manner, or other ways to form the electrode assembly 12. In the electrode assembly 12, the portions of the positive electrode tab 123 and the negative electrode tab 124 having active materials constitute the electrode body 121 of the electrode assembly 12, and the portions of the positive electrode tab 123 and the negative electrode tab 124 without active materials respectively constitute the electrode ears 122. The electrode ears 122 are the current transmission ends of the electrode assembly 12 and are used to transmit current. The electrode ear 122 of the positive electrode tab 123 is the positive electrode ear 122a, and the electrode ear 122 of the negative electrode tab 124 is the negative electrode ear 122b. The positive electrode ear 122a and the negative electrode ear 122b can be located at one end of the electrode body 121 together or at both ends of the electrode body 121 respectively.

[0070] The electrolyte is a liquid that infiltrates the electrode assembly 12. The battery cell 10 mainly operates by the movement of active ions between the positive electrode tab 123 and the negative electrode tab 124. When the battery cell 10 is charged, active ions are generated in the positive electrode tab 123. The active ions provided by the positive electrode tab 123 can penetrate the pores of the separator 125, move through the electrolyte to the negative electrode tab 124, and be embedded in the negative active material of the negative electrode tab 124. Conversely, when the battery cell 10 is discharged, the active ions embedded in the negative active material of the negative electrode tab 124 are released. The active ions released from the negative electrode tab 124 can penetrate the pores of the separator 125, move through the electrolyte to the positive electrode tab 123, and be embedded in the positive active material of the positive electrode tab 123. Among them, the active ions can be lithium ions, sodium ions, and so on.

[0071] The electrode terminals 14 are components that are electrically connected to the electrode assembly 12 and are used to output or input electrical energy. The electrode terminals 14 include a positive electrode terminal 14a and a negative electrode terminal 14b. The positive electrode terminal 14a is electrically connected to the positive electrode ear 122a of the electrode assembly 12. The negative electrode terminal 14b is electrically connected to the negative electrode ear 122b of the electrode assembly 12. The electrode terminals 14 can be installed on the housing 11 and have a stable installation position and installation state relative to the housing 11. In some embodiments, the electrode terminals 14 can be installed on the housing 11 by flanging and riveting.

[0072] The adapter 15 is a current collecting member electrically connected between the tab 122 of the electrode assembly 12 and the corresponding electrode terminal 14. The adapter 15 can also be referred to as an adapter connector, a current collecting plate, a transfer sheet, etc. The adapter 15 has electrical conductivity and is made of a conductive material. The material of the adapter 15 may include aluminum, aluminum alloy, copper, copper alloy, copper-aluminum alloy, etc. The adapter 15 includes a positive adapter 15a and a negative adapter 15b. The positive tab 122a of the electrode assembly 12 can be electrically connected to the positive electrode terminal 14a through the positive adapter 15a, and the negative tab 122b of the electrode assembly 12 can be electrically connected to the negative electrode terminal 14b through the negative adapter 15b to form a current loop. In some embodiments, the adapter 15 can be connected to the tab 122 of the electrode assembly 12 by welding, abutting, etc. The adapter 15 can be connected to the electrode terminal 14 by welding, abutting, etc. Among them, the shape of the adapter 15 can be diversified, such as square, circular, irregular, etc.

[0073] The insulating member 13 is a component with insulating properties. The insulating member 13 is disposed inside the housing 11, especially between the electrode assembly 12 and the wall portion (such as the end cap 112) of the housing 11 having the electrode terminal 14. On the basis that the tab 122 of the electrode assembly 12 and the corresponding electrode terminal 14 can achieve electrical connection, the insulating member 13 can be used to insulate and isolate the electrode assembly 12 and the wall portion of the housing 11 having the electrode terminal 14 to reduce the risk of short circuit, current leakage and other phenomena. In addition, the insulating member 13 can also be fixed to the wall portion of the housing 11 having the electrode terminal 14 and abut against the electrode assembly 12 to fill the gap between the electrode assembly 12 and this wall portion of the housing 11, and tightly fix the electrode assembly 12, so as to ensure that the electrode assembly 12 will not move or shake relative to each other during the use of the battery cell 10, which is beneficial to maintaining the structural integrity of the battery cell 10 and reducing the risk of loosening or deformation of the electrode assembly 12.

[0074] In some embodiments, a pressure relief mechanism 16 can also be provided on the housing 11. The pressure relief mechanism 16 can be used to release the internal pressure when the internal pressure (or temperature) of the battery cell 10 reaches a threshold value. Among them, the pressure relief mechanism 16 can be disposed on the end cap 112 or on any wall portion of the housing 111.

[0075] Please refer to Figure 3 、 Figure 4 、 Figure 5, some embodiments of the present application provide a battery cell 10, and the battery cell 10 includes an electrode assembly 12. The electrode assembly 12 includes a positive electrode tab 123, a negative electrode tab 124, and a separator 125, and the positive electrode tab 123, the separator 125, and the negative electrode tab 124 are stacked. The separator 125 includes a film body 1251. Protrusions 1252 are provided on at least one surface of the film body 1251. The protrusions 1252 include a plurality of strip-shaped bodies 12521. Adjacent two strip-shaped bodies 12521 are spaced apart, and a flow guiding channel 12522 is formed between them.

[0076] It should be noted that the electrode assembly 12 is a component in the battery cell 10 where an electrochemical reaction occurs. The battery cell 10 may be provided with one or at least two electrode assemblies 12. The electrode assembly 12 may be accommodated in the internal space enclosed by the housing 11.

[0077] The electrode assembly 12 includes a positive electrode tab 123, a negative electrode tab 124, and a separator 125, and the separator 125 separates the positive electrode tab 123 and the negative electrode tab 124. The positive electrode tab 123, the separator 125, and the negative electrode tab 124 can be processed into the electrode assembly 12 by winding, stacking, or other methods. That is, the electrode assembly 12 can be a wound electrode assembly 12, a stacked electrode assembly 12, or an electrode assembly 12 in other forms.

[0078] In addition, other related descriptions of the electrode assembly 12 can be referred to the previous text and will not be repeated here.

[0079] It should also be noted that the separator 125 includes a film body 1251 and protrusions 1252. The film body 1251 is the main part of the separator 125. The film body 1251 can be a sheet-like film. The film body 1251 can be made of, but not limited to, polypropylene or polyethylene microporous film. The film body 1251 can be used to provide a support basis for the protrusions 1252. And when the separator 125 is disposed between the positive electrode tab 123 and the negative electrode tab 124, the film body 1251 can play an isolation role for the positive electrode tab 123 and the negative electrode tab 124.

[0080] The protrusions 1252 are provided on the film body 1251. Among them, the protrusions 1252 can be provided on one surface of the film body 1251 along its thickness direction z, or the protrusions 1252 can be provided on both opposite surfaces of the film body 1251 along its thickness direction z. The protrusions 1252 can be formed on the surface of the film body 1251 by, but not limited to, coating. When the protrusions 1252 are formed by coating, the protrusions 1252 can also be called a coating. Among them, the protrusions 1252 can include, but not limited to, high molecular polymers, so the protrusions 1252 can also be called a polymer layer.

[0081] It should also be noted that the protrusion 1252 includes a plurality of strips 12521. The extension path of the strips 12521 can be straight or curved. Two adjacent strips 12521 can be arranged in parallel, or they can be arranged non-parallel and non-intersecting, such that two adjacent strips 12521 are spaced apart. The gap between two adjacent strips 12521 can form a strip-shaped flow guide channel 12522.

[0082] Thus, during normal use of the battery cell 10 provided in the embodiment of the present application, the strip-shaped, spaced-apart flow channels 12522 of the separator 125 facilitate the flow and storage of electrolyte in the flow channels 12522, thereby facilitating the electrolyte infiltration into the positive electrode sheet 123 and the negative electrode sheet 124. Furthermore, the membrane body 1251 and the protrusion 1252 of the separator 125, particularly the multiple strips 12521 spaced-apart on the protrusion 1252, promote sufficient adhesion and liquid retention between the separator 125 and the positive electrode sheet 123 and the negative electrode sheet 124. Based on this, on the one hand, the adhesiveness can be used to promote the stable bonding between the separator 125 and the positive electrode sheet 123 and the negative electrode sheet 124, thereby promoting the stability and reliability of the electrode assembly 12 structure, thereby facilitating the separator 125 to stably and reliably perform the functions of isolating and transmitting active ions between the positive electrode sheet 123 and the negative electrode sheet 124, thereby reducing the risk of short circuits due to movement or displacement of the separator 125, and optimizing the transmission efficiency of active ions by the separator 125 tightly attached between the positive electrode sheet 123 and the negative electrode sheet 124. On the other hand, the stability of the electrolyte in the electrode assembly 12 can be improved through the liquid retention capacity, and the electrolyte can be evenly distributed in the electrode assembly 12, thereby increasing the reaction rate between the positive electrode sheet 123, the negative electrode sheet 124 and the electrolyte, and promoting the transmission of active ions and energy conversion within the battery cell 10. In this way, the performance of the battery cell 10 can be optimized.

[0083] In the event of thermal runaway in the battery cell 10, the battery cell 10 provided in the embodiment of the present application can facilitate the flow of heat and gas through the strip-shaped, spaced-apart flow channels 12522 of the separator 125, facilitating the conduction of heat and gas from the electrode assembly 12, and even directional discharge out of the battery cell 10. This allows for rapid heat conduction, gas exhaust, and pressure relief, reducing the risk of heat and gas accumulation in the electrode assembly 12 and the risk of exacerbated thermal failure reactions in the electrode assembly 12 due to localized overheating, localized accumulation of high-pressure gas, and the like. This can slow the rate of thermal failure, mitigate the reaction and spread of thermal failure, enhance the controllability of thermal failure, and improve the reliability of the battery cell 10.

[0084] In addition, based on the settings of the strip 12521 and the diversion channels 12522, the weight of the electrode assembly 12 can also be reduced to a certain extent, thereby reducing the weight of the battery cell 10 and increasing the energy density of the battery cell 10.

[0085] Please refer to Figure 3 、 Figure 4 、 Figure 6 In some embodiments of the present application, the battery cell 10 further includes a pressure relief mechanism 16. The separator 125 includes a plurality of functional zones 1253 arranged in sequence along its extending direction a. The plurality of functional zones 1253 include a first zone 1253a, and the first zone 1253a is arranged corresponding to the pressure relief mechanism 16 along the center line L of the pressure relief mechanism 16. Among the functional zones 1253, the area of the protruding portion 1252 of the first zone 1253a is the smallest.

[0086] It should be noted that the pressure relief mechanism 16 can be used to directionally release the internal pressure when the internal pressure (or temperature) of the battery cell 10 reaches a threshold value. That is, in the case where the battery cell 10 undergoes thermal runaway and the internal pressure (or temperature) reaches the threshold value, the pressure relief mechanism 16 can be flushed open, and a channel for directional heat dissipation, exhaust gas, and pressure relief is formed to delay the thermal failure speed and improve the use reliability of the battery cell 10.

[0087] The pressure relief mechanism 16 can be installed on any wall of the housing 11 of the battery cell 10. As Figure 3 、 Figure 6 shown, in some embodiments, the pressure relief mechanism 16 can be installed on the wall of the housing 11 along the height direction of the battery cell 10, that is, the pressure relief mechanism 16 can be installed on the end cap 112 or the wall of the housing 111 opposite to the end cap 112. In this case, the pressure relief mechanism 16 is located at the top or bottom of the electrode assembly 12.

[0088] It should also be noted that along the extending direction a of the separator 125, the separator 125 can be divided into a plurality of functional zones 1253 arranged in sequence. Along the extending direction a of the separator 125, the sizes of the functional zones 1253 can be set the same or differently.

[0089] Among the functional zones 1253, the functional zone 1253 arranged corresponding to the pressure relief mechanism 16 along the center line L of the pressure relief mechanism 16 is the first zone 1253a. The area of the protruding portion 1252 of the first zone 1253a is the smallest, that is, the number of protruding portions 1252 provided in the first zone 1253a is the least. Based on this, the adhesion between the first zone 1253a and the positive electrode plate 123 and the negative electrode plate 124 can be made weaker, and the area of the diversion channels 12522 in the first zone 1253a can be made the largest (that is, the number of diversion channels 12522 in the first zone 1253a is the most).

[0090] By adopting the above solution, the diaphragm 125 can be made to have a first region 1253a corresponding to the pressure relief mechanism 16, and the area of the protruding portion 1252 of the first region 1253a can be minimized, so that the adhesion between the first region 1253a and the positive electrode plate 123 and the negative electrode plate 124 is weak, and the area of the diversion channel 12522 of the first region 1253a is maximized. Based on this, in the case of thermal runaway of the battery cell 10, the first region 1253a corresponding to the pressure relief mechanism 16 can provide the largest number and area of diversion channels 12522 to quickly direct heat and gas to the pressure relief mechanism 16, thereby providing an efficient directional release path for heat and gas, enabling rapid heat conduction, exhaust, and pressure relief, reducing the risk of heat and gas accumulation in the electrode assembly 12, delaying the thermal failure speed, alleviating the thermal failure reaction and thermal failure diffusion, enhancing the controllability of thermal failure, and improving the use reliability of the battery cell 10.

[0091] Of course, in other embodiments, the number and area of the protruding portions 1252 of each functional region 1253 can be flexibly set as required, and the area of the protruding portion 1252 of the first region 1253a may not be the smallest.

[0092] Please refer to Figure 3 、 Figure 4 、 Figure 6 In some embodiments of the present application, the first region 1253a includes a plurality of functional sub-regions 12531 arranged in sequence along the direction b close to the pressure relief mechanism 16. The area of the protruding portion 1252 of the functional sub-region 12531 closer to the pressure relief mechanism 16 is smaller.

[0093] It should be noted that along the direction b close to the pressure relief mechanism 16, the first region 1253a can be divided into a plurality of functional sub-regions 12531 arranged in sequence. Along the direction b close to the pressure relief mechanism 16, the sizes of the functional sub-regions 12531 can be set to be the same or different.

[0094] In the first region 1253a, the area of the protruding portion 1252 of the functional sub-region 12531 closer to the pressure relief mechanism 16 is smaller. That is, among any two functional sub-regions 12531, the area of the protruding portion 1252 of the functional sub-region 12531 relatively closer to the pressure relief mechanism 16 is smaller than the area of the protruding portion 1252 of the functional sub-region 12531 relatively farther from the pressure relief mechanism 16.

[0095] Conversely, the area of the diversion channel 12522 of the functional sub-region 12531 closer to the pressure relief mechanism 16 is larger. That is, among any two functional sub-regions 12531, the area of the diversion channel 12522 of the functional sub-region 12531 relatively closer to the pressure relief mechanism 16 is larger than the area of the diversion channel 12522 of the functional sub-region 12531 relatively farther from the pressure relief mechanism 16.

[0096] By adopting the above solution, in the first region 1253a, the area of the protrusion 1252 of the functional partition 12531 closer to the pressure relief mechanism 16 can be made smaller, so that the adhesion between the functional partition 12531 closer to the pressure relief mechanism 16 and the electrode tab (i.e., the abbreviation of the positive electrode tab 123 and the negative electrode tab 124) is weaker, and the area of the diversion channel 12522 of the functional partition 12531 closer to the pressure relief mechanism 16 is larger. Based on this, during the normal use of the battery cell 10, the functional partition 12531 farther from the pressure relief mechanism 16 can form a better adhesion with the electrode tab and can have a better liquid retention capacity, thereby maintaining the performance of the battery cell 10. In the case of thermal runaway of the battery cell 10, the functional partition 12531 closer to the pressure relief mechanism 16 can provide a larger number and area of diversion channels 12522, can temporarily store and discharge more heat and gas, and can direct more heat and gas to the pressure relief mechanism 16 faster. Thus, heat conduction, exhaust, and pressure relief can be achieved step by step and efficiently from the pressure relief mechanism 16, facilitating the directional release of heat and gas, reducing the risk of heat and gas accumulation in the electrode assembly 12, delaying the speed of thermal failure, alleviating the thermal failure reaction and thermal failure diffusion, enhancing the controllability of thermal failure, and improving the use reliability of the battery cell 10.

[0097] Of course, in other embodiments, the area of the protrusion 1252 of each functional partition 12531 in the first region 1253a can be flexibly set as required. For example, the areas of the protrusions 1252 of each functional partition 12531 can be set to be the same.

[0098] Please refer to Figure 3 、 Figure 4 、 Figure 6 In some embodiments of the present application, the multiple functional partitions 12531 include a first partition 12531a and a second partition 12531b. The second partition 12531b is disposed on the side of the first partition 12531a closer to the pressure relief mechanism 16. The first partition 12531a is provided with a protrusion 1252, and the area of the protrusion 1252 of the second partition 12531b is 0.

[0099] It should be noted that along the direction b closer to the pressure relief mechanism 16, the first region 1253a can be divided into two functional partitions 12531 arranged in sequence. Among them, the functional partition 12531 relatively farther from the pressure relief mechanism 16 is the first partition 12531a, and the functional partition 12531 relatively closer to the pressure relief mechanism 16 is the second partition 12531b, that is, the second partition 12531b is disposed on the side of the first partition 12531a closer to the pressure relief mechanism 16.

[0100] The first partition 12531a is provided with a protruding portion 1252, that is, the area of the protruding portion 1252 of the first partition 12531a is greater than 0. The first partition 12531a can form a weak bond with the electrode tab, that is, the first partition 12531a is a weak connection area.

[0101] The second partition 12531b is not provided with a protruding portion 1252, that is, the area of the protruding portion 1252 of the second partition 12531b is 0. The second partition 12531b is not bonded to the electrode tab, that is, the second partition 12531b is a non-connection area.

[0102] By adopting the above solution, the first region 1253a can be such that the first partition 12531a relatively far from the pressure relief mechanism 16 is provided with a protruding portion 1252, and the second partition 12531b relatively close to the pressure relief mechanism 16 is not provided with a protruding portion 1252, so that the area of the protruding portion 1252 of the second partition 12531b is smaller than the area of the protruding portion 1252 of the first partition 12531a, and the area of the diversion channel 12522 of the second partition 12531b is larger than the area of the diversion channel 12522 of the first partition 12531a. Based on this, during the normal use of the battery cell 10, a better bonding property can be formed between the first partition 12531a provided with the protruding portion 1252 and the electrode tab, having a better liquid retention ability, thereby maintaining the performance of the battery cell 10. In the case of thermal runaway of the battery cell 10, part of the heat and gas can be temporarily stored through the diversion channel 12522 of the first partition 12531a and guided to the second partition 12531b. A large amount of heat and gas can also be mainly temporarily stored through the large-area diversion channel 12522 of the second partition 12531b and guided to the pressure relief mechanism 16 quickly. Thus, heat conduction, exhaust, and pressure relief can be efficiently achieved, facilitating the directional release of heat and gas, reducing the risk of heat and gas accumulation in the electrode assembly 12, delaying the thermal failure speed, alleviating the thermal failure reaction and thermal failure diffusion, enhancing the controllability of thermal failure, and improving the use reliability of the battery cell 10.

[0103] Please refer to Figure 3 、 Figure 4 、 Figure 7 In some embodiments of the present application, a plurality of functional partitions 12531 include a first partition 12531a and a second partition 12531b. The second partition 12531b is provided on the side of the first partition 12531a close to the pressure relief mechanism 16. The first partition 12531a is provided with a protruding portion 1252, the second partition 12531b is provided with a protruding portion 1252, and the area of the protruding portion 1252 of the second partition 12531b is smaller than the area of the protruding portion 1252 of the first partition 12531a.

[0104] It should be noted that along the direction b close to the pressure relief mechanism 16, the first area 1253a can be divided into two functional areas 12531 arranged in sequence. Among them, the functional area 12531 relatively far from the pressure relief mechanism 16 is the first area 12531a, and the functional area 12531 relatively close to the pressure relief mechanism 16 is the second area 12531b, that is, the second area 12531b is arranged on the side of the first area 12531a close to the pressure relief mechanism 16.

[0105] The first area 12531a is provided with a protruding portion 1252, that is, the area of the protruding portion 1252 of the first area 12531a is greater than 0. The first area 12531a and the pole piece can form a weak bond, that is, the first area 12531a is a weak connection area.

[0106] The second area 12531b is also provided with a protruding portion 1252, that is, the area of the protruding portion 1252 of the second area 12531b is also greater than 0. The second area 12531b and the pole piece also form a weak bond, that is, the second area 12531b is also a weak connection area. The area of the protruding portion 1252 of the second area 12531b is smaller than the area of the protruding portion 1252 of the first area 12531a, so that the bonding property between the second area 12531b and the pole piece is weaker than the bonding property between the first area 12531a and the pole piece, and the area of the flow guiding channel 12522 of the second area 12531b is larger than the area of the flow guiding channel 12522 of the first area 12531a.

[0107] By adopting the above solution, the first area 1253a can be divided into a first sub-area 12531a and a second sub-area 12531b along the direction b close to the pressure relief mechanism 16. And by making both the first sub-area 12531a and the second sub-area 12531b be provided with protruding parts 1252, and making the area of the protruding part 1252 of the second sub-area 12531b smaller than the area of the protruding part 1252 of the first sub-area 12531a, so that the area of the protruding part 1252 of the second sub-area 12531b is smaller than the area of the protruding part 1252 of the first sub-area 12531a, and making the area of the diversion channel 12522 of the second sub-area 12531b larger than the area of the diversion channel 12522 of the first sub-area 12531a. Based on this, during the normal use of the battery cell 10, different strengths of adhesion can be formed between the first sub-area 12531a and the second sub-area 12531b and the electrode plate respectively, which can promote better liquid retention ability between the first area 1253a and the electrode plate, thereby maintaining the performance of the battery cell 10. In the case of thermal runaway of the battery cell 10, heat and gas can be temporarily stored through the diversion channel 12522 of the first sub-area 12531a, and the heat and gas can be guided to the second sub-area 12531b. And more heat and gas can be temporarily stored through the diversion channel 12522 of the second sub-area 12531b, and the heat and gas can be quickly guided to the pressure relief mechanism 16. Thus, heat conduction, exhaust, and pressure relief can be efficiently realized, the directional release of heat and gas can be facilitated, the risk of heat and gas accumulation in the electrode assembly 12 can be reduced, the thermal failure speed can be delayed, the thermal failure reaction and thermal failure diffusion can be alleviated, the controllability of thermal failure can be enhanced, and the use reliability of the battery cell 10 can be improved.

[0108] Please refer to Figure 3 、 Figure 4 、 Figure 7 In some embodiments of the present application, the strip 12521 of the first area 1253a includes an alternating arrangement of a first strip 12521a and a second strip 12521b. The first strip 12521a extends along the direction b close to the pressure relief mechanism 16 in the first sub-area 12531a and the second sub-area 12531b, and the second strip 12521b extends along the direction b close to the pressure relief mechanism 16 in the first sub-area 12531a.

[0109] It should be noted that the strip 12521 of the first area 1253a includes a first strip 12521a and a second strip 12521b. In the first area 1253a, the first strip 12521a and the second strip 12521b are alternately arranged in the manner of "first strip 12521a, second strip 12521b, first strip 12521a, second strip 12521b...".

[0110] In the direction b close to the pressure relief mechanism 16, the first strip 12521a extends between the first partition 12531a and the second partition 12531b, that is, the first strip 12521a extends from the first partition 12531a to the second partition 12531b.

[0111] In the direction b close to the pressure relief mechanism 16, the second strip 12521b only extends in the first partition 12531a and does not extend in the second partition 12531b.

[0112] By adopting the above solution, the first area 1253a can make the first strip 12521a extend between the first partition 12531a and the second partition 12531b in the direction b close to the pressure relief mechanism 16, and make the second strip 12521b extend in the first partition 12531a in the direction b close to the pressure relief mechanism 16, so that the first partition 12531a has the first strip 12521a and the second strip 12521b, and the second partition 12(531b only has the second strip 12521b. Based on this, the layout of the strips 12521 in both the first partition 12531a and the second partition 12531b can be optimized, and the protrusions 1252 with different areas can be conveniently and quickly formed in the first partition 12531a and the second partition 12531b. It can conveniently and accurately make the area of the protrusion 1252 in the second partition 12531b smaller than the area of the protrusion 1252 in the first partition 12531a, and even accurately control the area ratio of the protrusions 1252 in both the first partition 12531a and the second partition 12531b. It can conveniently and accurately make the area of the diversion channel 12522 in the second partition 12531b larger than the area of the diversion channel 12522 in the first partition 12531a, and even accurately control the area ratio of the diversion channels 12522 in both the first partition 12531a and the second partition 12531b.

[0113] Of course, in other embodiments, the strips 12521 in the first area 1253a can adopt other layout methods, so that the area of the protrusion 1252 in the second partition 12531b is smaller than the area of the protrusion 1252 in the first partition 12531a, and the area of the diversion channel 12522 in the second partition 12531b is larger than the area of the diversion channel 12522 in the first partition 12531a.

[0114] Please refer to Figure 6 、 Figure 7 , in some embodiments of the present application, the extending direction of the strips 12521 in the first area 1253a is parallel to the center line L of the pressure relief mechanism 16.

[0115] By adopting the above solution, by making the extending direction of the strip 12521 in the first area 1253a parallel to the center line L of the pressure relief mechanism 16, the extending direction of the diversion channel 12522 in the first area 1253a can be made parallel to the center line L of the pressure relief mechanism 16. Based on this, it is convenient for the diversion channel 12522 in the first area 1253a to quickly and directly guide heat and gas to the pressure relief mechanism 16 along a shorter path, thereby optimizing the guiding effect of the diversion channel 12522 in the first area 1253a on heat and gas, and facilitating the directional release of heat and gas.

[0116] Of course, in other embodiments, the extending direction of the strip 12521 in the first area 1253a may be inclined to the center line L of the pressure relief mechanism 16.

[0117] Please refer to Figure 3 , Figure 4 , Figure 6 , Figure 7 , in some embodiments of the present application, the multiple functional areas 1253 include a second area 1253b, and the second area 1253b is arranged offset from the pressure relief mechanism 16 along the center line L of the pressure relief mechanism 16. The extending direction of the strip 12521 in the second area 1253b points to the pressure relief mechanism 16 and is inclined to the center line L of the pressure relief mechanism 16.

[0118] It should be noted that along the extending direction a of the diaphragm 125, the diaphragm 125 can be divided into multiple functional areas 1253 arranged in sequence. Among the functional areas 1253, the functional areas 1253 arranged offset from the pressure relief mechanism 16 along the center line L of the pressure relief mechanism 16 can be partially the second area 1253b or all the second area 1253b. The area of the protruding part 1252 in the second area 1253b is larger than the area of the protruding part 1252 in the first area 1253a.

[0119] According to the position of the second area 1253b, the extending direction of the strip 12521 in the second area 1253b is inclined to the center line L of the pressure relief mechanism 16, and the end of the strip 12521 close to the pressure relief mechanism 16 points to the pressure relief mechanism 16. In this way, the diversion channel 12522 in the second area 1253b can also be inclined to guide to the pressure relief mechanism 16.

[0120] By adopting the above solution, the diaphragm 125 can be made to have a second region 1253b that is misaligned with the pressure relief mechanism 16, and the strip 12521 of the second region 1253b can be inclined to point to the pressure relief mechanism 16, so that the diversion channel 12522 of the second region 1253b is also inclined to guide to the pressure relief mechanism 16. Based on this, during the normal use of the battery cell 10, the second region 1253b that is misaligned with the pressure relief mechanism 16 can, via the strip 12521 that is inclined to point to the pressure relief mechanism 16, have better adhesion and liquid retention ability between the second region 1253b and the electrode plate, thereby optimizing the performance of the battery cell 10. In the case of thermal runaway of the battery cell 10, the second region 1253b that is misaligned with the pressure relief mechanism 16 can, via the diversion channel 12522 that is inclined to guide to the pressure relief mechanism 16, guide heat and gas to the pressure relief mechanism 16 quickly, thereby optimizing the guiding effect of the diversion channel 12522 of the second region 1253b on heat and gas, facilitating the directional release of heat and gas, reducing the risk of heat and gas accumulating in the electrode assembly 12, delaying the thermal failure speed, alleviating the thermal failure reaction and thermal failure diffusion, enhancing the controllability of thermal failure, and improving the use reliability of the battery cell 10.

[0121] Of course, in other embodiments, the extending direction of the strip 12521 of the second region 1253b can be flexibly set as required. For example, the extending direction of the strip 12521 of the second region 1253b can be parallel to the center line L of the pressure relief mechanism 16.

[0122] Please refer to Figure 3 、 Figure 4 、 Figure 8 、 Figure 9 In some embodiments of the present application, the multiple functional regions 1253 include a second region 1253b, and the second region 1253b is misaligned with the pressure relief mechanism 16 along the center line L of the pressure relief mechanism 16. The second region 1253b includes a third partition 12532 and a fourth partition 12533 that are arranged in sequence along the direction b close to the pressure relief mechanism 16. The extending direction of the strip 12521 of the third partition 12532 points to the pressure relief mechanism 16 and is inclined to the center line L of the pressure relief mechanism 16. The extending direction of the strip 12521 of the fourth partition 12533 is perpendicular to the center line L of the pressure relief mechanism 16.

[0123] It should be noted that along the extending direction a of the diaphragm 125, the diaphragm 125 can be divided into multiple functional regions 1253 arranged in sequence. Among the functional regions 1253, the functional regions 1253 that are misaligned with the pressure relief mechanism 16 along the center line L of the pressure relief mechanism 16 can be partly the second region 1253b or all the second region 1253b. The area of the protrusion 1252 of the second region 1253b is larger than the area of the protrusion 1252 of the first region 1253a.

[0124] In the direction b close to the pressure relief mechanism 16, the second zone 1253b can be divided into a third sub-zone 12532 and a fourth sub-zone 12533 arranged in sequence. The third sub-zone 12532 is relatively far from the pressure relief mechanism 16, and the fourth sub-zone 12533 is relatively close to the pressure relief mechanism 16.

[0125] According to the position of the second zone 1253b, the extending direction of the strip 12521 in the third sub-zone 12532 is inclined to the center line L of the pressure relief mechanism 16, and one end of the strip 12521 close to the pressure relief mechanism 16 points to the pressure relief mechanism 16. In this way, the diversion channel 12522 in the third sub-zone 12532 can also be inclined to guide to the pressure relief mechanism 16.

[0126] The extending direction of the strip 12521 in the fourth sub-zone 12533 is perpendicular to the center line L of the pressure relief mechanism 16. In this way, the diversion channel 12522 in the fourth sub-zone 12533 can be guided to the center line L of the pressure relief mechanism 16, and thus guided to the pressure relief mechanism 16.

[0127] By adopting the above scheme, the second zone 1253b can make the strip 12521 in the third sub-zone 12532 inclined to point to the pressure relief mechanism 16, so that the diversion channel 12522 in the third sub-zone 12532 is inclined to guide to the pressure relief mechanism 16. The second zone 1253b can also make the extending direction of the strip 12521 in the fourth sub-zone 12533 perpendicular to the center line L of the pressure relief mechanism 16, so that the diversion channel 12522 in the fourth sub-zone 12533 is guided to the center line L of the pressure relief mechanism 16, and thus guided to the pressure relief mechanism 16. Based on this, during the normal use of the battery cell 10, the second zone 1253b arranged out of alignment with the pressure relief mechanism 16 can jointly promote better adhesion and liquid retention ability between the second zone 1253b and the electrode plate through the strip 12521 in the third sub-zone 12532 inclined to point to the pressure relief mechanism 16 and the strip 12521 in the fourth sub-zone 12533 perpendicular to the center line L of the pressure relief mechanism 16, thereby optimizing the performance of the battery cell 10. In the case of thermal runaway of the battery cell 10, the second zone 1253b arranged out of alignment with the pressure relief mechanism 16 can jointly guide heat and gas to quickly guide to the pressure relief mechanism 16 through the diversion channel 12522 in the third sub-zone 12532 inclined to guide to the pressure relief mechanism 16 and the diversion channel 12522 in the fourth sub-zone 12533 perpendicular to guide to the center line L of the pressure relief mechanism 16. Thus, the guiding effect of the diversion channel 12522 in the second zone 1253b on heat and gas can be optimized, the directional release of heat and gas can be facilitated, the risk of heat and gas accumulating in the electrode assembly 12 can be reduced, the thermal failure speed can be delayed, the thermal failure reaction and thermal failure diffusion can be alleviated, the controllability of thermal failure can be enhanced, and the use reliability of the battery cell 10 can be improved.

[0128] Of course, in other embodiments, the extending direction of the strip 12521 in the third partition 12532 can be flexibly set as required. For example, the extending direction of the strip 12521 in the third partition 12532 can be parallel to the center line L of the pressure relief mechanism 16.

[0129] Of course, in other embodiments, the extending direction of the strip 12521 in the fourth partition 12533 can be flexibly set as required. For example, the extending direction of the strip 12521 in the fourth partition 12533 can be parallel to the center line L of the pressure relief mechanism 16, or can be inclined to point to the pressure relief mechanism 16.

[0130] Of course, in other embodiments, the second region 1253b can be divided into at least three partitions along the direction b close to the pressure relief mechanism 16, and the extending directions of the strips 12521 in each partition can be flexibly set as required.

[0131] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 , in some embodiments of the present application, two second regions 1253b respectively arranged on opposite sides of the first region 1253a are symmetrically arranged.

[0132] It should be noted that the two functional regions 1253 respectively arranged on opposite sides of the first region 1253a and adjacent to the first region 1253a are both the second regions 1253b. These two second regions 1253b are symmetrically arranged with respect to the first region 1253a. In particular, the strips 12521 of these two second regions 1253b are symmetrically arranged with respect to the first region 1253a, and the flow guiding channels 12522 of these two second regions 1253b are symmetrically arranged with respect to the first region 1253a.

[0133] By adopting the above solution, by making the two second regions 1253b respectively arranged on opposite sides of the first region 1253a and adjacent to the first region 1253a symmetrically arranged with respect to the first region 1253a, the strips 12521 of these two second regions 1253b can be symmetrically arranged with respect to the first region 1253a, and the flow guiding channels 12522 of these two second regions 1253b can be symmetrically arranged with respect to the first region 1253a. Based on this, during the normal use of the battery cell 10 (as shown in Figure 3 ), the adhesiveness and liquid retention ability of these two second regions 1253b can be relatively balanced, so as to balance and optimize the performance of the battery cell 10. In the case of thermal runaway of the battery cell 10, these two second regions 1253b can respectively guide heat and gas in opposite directions to the pressure relief mechanism 16 quickly through the symmetrically arranged flow guiding channels 12522, so as to balance and optimize the guiding effect of these two second regions 1253b on heat and gas, and facilitate the directional release of heat and gas.

[0134] Of course, in other embodiments, the two second regions 1253b disposed on opposite sides of the first region 1253a and adjacent to the first region 1253a may be asymmetrically arranged.

[0135] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 ., in combination with some of the above embodiments, the embodiments of the present application provide a specific example of a battery cell 10 herein. The battery cell 10 includes an electrode assembly 12 and a pressure relief mechanism 16. The electrode assembly 12 includes a positive electrode tab 123, a negative electrode tab 124, and a separator 125. The separator 125 separates the positive electrode tab 123 and the negative electrode tab 124. The separator 125 includes a film body 1251, and convex portions 1252 are provided on both surfaces of the film body 1251 along the thickness direction z thereof. The convex portion 1252 includes a plurality of strip-shaped bodies 12521, and adjacent two strip-shaped bodies 12521 are spaced apart, and the gap therebetween forms a diversion channel 12522.

[0136] The separator 125 includes a plurality of functional regions 1253 arranged in sequence along its extension direction a. The plurality of functional regions 1253 include a first region 1253a, and the first region 1253a is correspondingly arranged with the pressure relief mechanism 16 along the center line L of the pressure relief mechanism 16. Among the functional regions 1253, the area of the convex portion 1252 of the first region 1253a is the smallest. The first region 1253a includes a first sub-region 12531a and a second sub-region 12531b arranged in sequence along the direction b close to the pressure relief mechanism 16. The first sub-region 12531a is provided with a convex portion 1252, and a weak bond can be formed between the first sub-region 12531a and the electrode tab, that is, the first sub-region 12531a is a weak connection region. The area of the convex portion 1252 of the second sub-region 12531b is 0, and no bond is formed between the second sub-region 12531b and the electrode tab, that is, the second sub-region 12531b is a non-connection region. The area of the convex portion 1252 of the second sub-region 12531b is smaller than the area of the convex portion 1252 of the first sub-region 12531a, and the area of the diversion channel 12522 of the second sub-region 12531b is larger than the area of the diversion channel 12522 of the first sub-region 12531a. The extending direction of the strip-shaped body 12521 of the first sub-region 12531a is parallel to the center line L of the pressure relief mechanism 16.

[0137] The multiple functional zones 1253 include a second zone 1253b which is arranged offset from the pressure relief mechanism 16 along the center line L of the pressure relief mechanism 16. The extending direction of the strip 12521 of the second zone 1253b points to the pressure relief mechanism 16 and is inclined to the center line L of the pressure relief mechanism 16. Two second zones 1253b which are arranged on opposite sides of and adjacent to the first zone 1253a are symmetrically arranged. In particular, the strips 12521 of the two second zones 1253b are symmetrically arranged with respect to the first zone 1253a, and the diversion channels 12522 of the two second zones 1253b are symmetrically arranged with respect to the first zone 1253a.

[0138] Based on the above structure, during the normal use of the battery cell 10, through the strip-shaped and spaced diversion channels 12522 of each functional zone 1253 such as the first zone 1253a and the second zone 1253b, it is convenient for the electrolyte to flow and be stored in the diversion channels 12522, and it is convenient for the electrolyte to infiltrate the positive electrode plate 123 and the negative electrode plate 124. Moreover, through the strip-shaped and spaced strips 12521 of each functional zone 1253 such as the first zone 1253a and the second zone 1253b, it can be ensured that there is sufficient adhesiveness and liquid retention capacity between the separator 125 and the positive electrode plate 123 and the negative electrode plate 124. Based on this, on the one hand, through the adhesiveness, it can be ensured that the separator 125 is stably bonded to the positive electrode plate 123 and the negative electrode plate 124, so that the structure of the electrode assembly 12 is stable and reliable. Thus, it is convenient for the separator 125 to stably and reliably play the roles of isolating and transporting active ions, etc. between the positive electrode plate 123 and the negative electrode plate 124, the risk of short circuit caused by the movement or offset of the separator 125 can be reduced, and the transport efficiency of the separator 125 closely attached between the positive electrode plate 123 and the negative electrode plate 124 to active ions can be optimized. On the other hand, through the liquid retention capacity, the stability of the electrolyte in the electrode assembly 12 can be improved, and the electrolyte can be evenly distributed in the electrode assembly 12. Thus, the reaction rate between the positive electrode plate 123, the negative electrode plate 124 and the electrolyte can be increased, and the transport of active ions and energy conversion inside the battery cell 10 can be promoted. Thereby, the performance of the battery cell 10 can be optimized.

[0139] In the case of thermal runaway of the battery cell 10, through the large-area diversion channels 12522 of the first partition 12531a, the larger-area diversion channels 12522 of the second partition 12531b, and the diversion channels 12522 of the second zone 1253b that are inclined to guide to the pressure relief mechanism 16, the heat and gas can be jointly guided to the pressure relief mechanism 16 quickly. Thus, heat conduction, exhaust and pressure relief can be carried out quickly, the directional release of heat and gas can be facilitated, the risk of heat and gas accumulation in the electrode assembly 12 can be reduced, the speed of thermal failure can be delayed, the thermal failure reaction and thermal failure diffusion can be alleviated, the controllability of thermal failure can be enhanced, and the use reliability of the battery cell 10 can be improved.

[0140] Please refer to Figure 2 and Figure 3 , some embodiments of the present application provide a battery 1, and the battery 1 includes a battery cell 10 provided by the embodiments of the present application.

[0141] By adopting the above solution, the performance and usage reliability of the battery 1 can be optimized by applying the battery cell 10 provided by the embodiments of the present application.

[0142] Please refer to Figure 1 and Figure 3 , some embodiments of the present application provide an electrical device, and the electrical device includes the battery 1 provided by the embodiments of the present application, or the battery cell 10 provided by the embodiments of the present application.

[0143] By adopting the above solution, the performance and usage reliability of the electrical device can be optimized by applying the battery 1 or the battery cell 10 provided by the embodiments of the present application.

[0144] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, or improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that: The battery cell includes an electrode assembly, the electrode assembly includes a positive electrode tab, a negative electrode tab and a separator, and the positive electrode tab, the separator and the negative electrode tab are stacked; The separator includes a film body, and a protruding portion is provided on at least one surface of the film body. The protruding portion includes a plurality of strip-shaped bodies, and adjacent two strip-shaped bodies are spaced apart, and a gap therebetween forms a diversion channel.

2. The battery cell according to claim 1, wherein The battery cell further includes a pressure relief mechanism; The separator includes a plurality of functional regions arranged in sequence along its extending direction, and the plurality of functional regions include a first region, and the first region is arranged corresponding to the pressure relief mechanism along the center line of the pressure relief mechanism; Among the respective functional regions, the area of the protruding portion of the first region is the smallest.

3. The battery cell according to claim 2, wherein: The first region includes a plurality of functional sub-regions arranged in sequence along the direction close to the pressure relief mechanism; the area of the protruding portion of the functional sub-region closer to the pressure relief mechanism is smaller.

4. The battery cell according to claim 3, wherein: The plurality of functional sub-regions include a first sub-region and a second sub-region, the second sub-region is arranged on one side of the first sub-region close to the pressure relief mechanism, the first sub-region is provided with the protruding portion, and the area of the protruding portion of the second sub-region is 0.

5. The battery cell according to claim 3, characterized in that, The plurality of functional sub-regions include a first sub-region and a second sub-region, the second sub-region is arranged on one side of the first sub-region close to the pressure relief mechanism, the first sub-region is provided with the protruding portion, the second sub-region is provided with the protruding portion, and the area of the protruding portion of the second sub-region is smaller than the area of the protruding portion of the first sub-region.

6. The battery cell according to claim 5, wherein, The strip-shaped bodies in the first region include first strip-shaped bodies and second strip-shaped bodies arranged alternately, the first strip-shaped bodies extend in the direction close to the pressure relief mechanism in the first sub-region and the second sub-region, and the second strip-shaped bodies extend in the direction close to the pressure relief mechanism in the first sub-region.

7. The battery cell according to claim 2, wherein: The extending direction of the strip-shaped bodies in the first region is parallel to the center line of the pressure relief mechanism.

8. The battery cell according to any one of claims 2-7, characterized in that, The plurality of functional regions include a second region, and the second region is arranged offset from the pressure relief mechanism along the center line of the pressure relief mechanism; The extending direction of the strip-shaped bodies in the second region points to the pressure relief mechanism and is inclined to the center line of the pressure relief mechanism.

9. The battery cell according to any one of claims 2-7, characterized in that, The plurality of functional regions include a second region, and the second region is arranged offset from the pressure relief mechanism along the center line of the pressure relief mechanism; The second region includes a third sub-region and a fourth sub-region arranged in sequence along the direction close to the pressure relief mechanism; the extending direction of the strip-shaped bodies in the third sub-region points to the pressure relief mechanism and is inclined to the center line of the pressure relief mechanism; the extending direction of the strip-shaped bodies in the fourth sub-region is perpendicular to the center line of the pressure relief mechanism.

10. The battery cell according to claim 8, characterized in that, The two second regions respectively arranged on opposite sides of the first region are symmetrically arranged.

11. The battery cell according to claim 9, characterized in that, The two second regions respectively arranged on opposite sides of the first region are symmetrically arranged.

12. A battery, characterized in that: The battery includes the battery cell according to any one of claims 1-11.

13. An electrical device, characterized in that, The electrical device includes the battery according to claim 12, or the battery cell according to any one of claims 1-11.

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