Battery monomer, battery device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly and a shell, the shell forms an accommodating space, the shell comprises at least one main side wall part, the main side wall part is provided with an exhaust groove and a limiting bulge, the electrode assembly is arranged in the accommodating space, the exhaust groove corresponds to an edge area of the electrode assembly in the length direction of the electrode assembly, and the limiting bulge is arranged on the edge area of the electrode assembly. The limiting protrusion corresponds to the middle area of the electrode assembly. Therefore, the electrode assembly is arranged in the accommodating space of the shell, and the shell is provided with the exhaust groove and the limiting bulge which correspond to the edge area and the middle area of the electrode assembly respectively, so that the middle area, which is easier to deform, of the electrode assembly can be in contact with the limiting bulge preferentially after deformation; the risk that gas in the shell cannot be discharged out of the shell from the exhaust groove due to the fact that the middle area of the electrode assembly deforms to block the exhaust groove is relieved, and the risk that the use performance of the single battery is damaged due to the fact that more gas is accumulated in the shell is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to sustainable development, which has promoted the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle capacity, high operating voltage, environmental protection and low self-discharge.

[0003] A battery device includes one or more battery cells. During multiple cycles of charge and discharge, gas will be generated inside the battery cells due to side reactions of the electrochemical reaction. As the gas content increases, the gas pressure inside the battery casing will also increase. If the gas cannot be properly guided to the outside of the casing, the service life of the battery cells will easily be reduced. Utility Model Content

[0004] The main purpose of this application is to provide a pole piece production equipment and a pole piece production system, aiming to solve the above-mentioned technical problems existing in the prior art.

[0005] In order to solve the above problems, the present application provides a battery cell, which includes an electrode assembly and a shell, the shell is formed with a storage space, the shell includes at least one main side wall portion, the main side wall portion has an exhaust groove and a limiting protrusion, the electrode assembly is arranged in the storage space, in the length direction of the electrode assembly, the exhaust groove corresponds to the edge area of ​​the electrode assembly, and the limiting protrusion corresponds to the middle area of ​​the electrode assembly. Thus, the electrode assembly is arranged in the storage space of the shell, the main side wall portion of the shell has an exhaust groove and a limiting protrusion, in the length direction of the electrode assembly, the exhaust groove corresponds to the edge area of ​​the electrode assembly, and the limiting protrusion corresponds to the middle area of ​​the electrode assembly, so that the middle area of ​​the electrode assembly that is more prone to deformation can preferentially contact the limiting protrusion after deformation, thereby alleviating the risk that the gas inside the shell cannot be discharged from the exhaust groove due to the deformation of the middle area of ​​the electrode assembly to block the exhaust groove, and improving the risk of accumulating more gas inside the shell and damaging the performance of the battery cell.

[0006] In some embodiments, the main side wall is provided with two exhaust grooves, and the two exhaust grooves are located on both sides of the limiting protrusion in the length direction of the electrode assembly. Thus, the main side wall is provided with two exhaust grooves, which can further improve the exhaust efficiency of the shell, and the two exhaust grooves are located on both sides of the limiting protrusion in the length direction of the electrode assembly, so that the two exhaust grooves can form a avoidance with the limiting protrusion, alleviating the risk that the gas inside the shell cannot be discharged from the shell through the exhaust groove due to deformation of the middle area of ​​the electrode assembly to block the exhaust groove.

[0007] In some embodiments, the exhaust groove is extended along the width direction of the electrode assembly. Thus, the exhaust groove is extended along the width direction of the electrode assembly, and the exhaust efficiency of the housing is further improved by increasing the extension length of the exhaust groove.

[0008] In some embodiments, the exhaust groove includes a first groove section, and the first groove section and the limiting protrusion are arranged adjacent to each other. In the length direction, the farther the first groove section is from the limiting protrusion, the greater the depth of the first groove section. Thus, the first groove section is adjacent to the limiting protrusion, and the depth of the first groove section gradually increases with the increase of the distance from the limiting protrusion, which can alleviate the risk of the overall strength of the housing being reduced due to the sudden change in the structure between the first groove section and the limiting protrusion, resulting in greater stress at the connection between the two.

[0009] In some embodiments, the exhaust groove includes a second groove section, the second groove section is connected to the first groove section, the second groove section is located on the side of the first groove section away from the limiting protrusion, and the depth of the second groove section is greater than the depth of the first groove section. Thus, the second groove section is connected to the side of the first groove section away from the limiting protrusion, and the depth of the second groove section is greater than the depth of the first groove section, so that the exhaust groove has a larger volume, thereby improving the exhaust efficiency of the housing.

[0010] In some embodiments, the exhaust groove includes a third groove section, the third groove section is located on the side of the second groove section away from the first groove section, the third groove section is connected to the second groove section, and in the length direction, the further away the third groove section is from the second groove section, the smaller the depth is. Thus, the volume of the exhaust groove can be further increased by setting the third groove section, and in the length direction, the further away the third groove section is from the second groove section, the smaller the depth is, which can alleviate the risk of reducing the overall strength of the shell due to the sudden change in the depth of the third groove section causing greater stress at the corresponding position.

[0011] In some embodiments, the housing includes a secondary side wall portion, the secondary side wall portion is connected to the primary side wall portion, the exhaust groove is located between the limiting protrusion and the secondary side wall portion, and the third groove section is spaced apart from the secondary side wall portion in the length direction. Thus, the third groove section is spaced apart from the secondary side wall portion, which can alleviate the risk of low overall structural strength of the housing due to the thin thickness of the connection between the secondary side wall portion and the primary side wall portion.

[0012] In some embodiments, the housing includes a secondary side wall portion, the secondary side wall portion is connected to the primary side wall portion, the exhaust groove is located between the limiting protrusion and the secondary side wall portion, and the second groove section extends to the secondary side wall portion along the length direction. Thus, the second groove section is connected to the secondary side wall portion at a side away from the first groove section in the length direction, so that the exhaust groove extends to the connection between the primary side wall portion and the secondary side wall portion, and the exhaust efficiency of the housing is further improved by increasing the extension length of the exhaust groove.

[0013] In some embodiments, the housing includes two main sidewalls, the two main sidewalls are arranged relatively spaced apart in the thickness direction of the electrode assembly, and the electrode assembly is located between the two main sidewalls. Thus, the housing includes two main sidewalls, the electrode assembly is located between the two main sidewalls, and each main sidewall has an exhaust groove, thereby improving the exhaust efficiency of the housing.

[0014] In some embodiments, the size of the exhaust groove is larger than the size of the electrode assembly in the width direction of the electrode assembly. Thus, the size of the exhaust groove is larger than the size of the electrode assembly, so that the exhaust groove can extend beyond the electrode assembly in the width direction, thereby reducing the risk of the electrode assembly blocking both ends of the exhaust groove in the width direction, so as to facilitate the exhaust of gas in the accommodation space through the exhaust groove.

[0015] In some embodiments, the housing includes an end wall portion, the end wall portion is connected to the main side wall portion in the width direction of the electrode assembly, the battery cell includes an explosion-proof component, the explosion-proof component is arranged on the end wall portion, one end of the exhaust groove extends to the end wall portion, and the other end extends to the side of the housing away from the end wall portion. Thus, the end wall portion is provided with an explosion-proof component, one end of the exhaust groove is close to the explosion-proof component arranged on the end wall portion, and the other end of the exhaust groove extends to the side away from the end wall portion, so that the gas between the end wall portion and the end wall portion is conveniently guided to the explosion-proof component through the exhaust groove, so as to efficiently discharge the gas from the accommodation space through the explosion-proof component.

[0016] In order to solve the above problems, the present application provides a battery device, which includes the battery cell as described above.

[0017] In order to solve the above problems, the present application provides an electrical device, which includes the battery device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1is a schematic structural diagram of a vehicle according to one or more embodiments of the present application;

[0020] Figure 2 is a schematic diagram of an exploded structure of a battery device according to one or more embodiments of the present application;

[0021] Figure 3 is a schematic diagram of a disassembled structure of a battery cell according to one or more embodiments of the present application;

[0022] Figure 4 is a schematic structural diagram of a housing from a first perspective without an end wall according to one or more embodiments of the present application;

[0023] Figure 5 is a cross-sectional view of a first embodiment of a housing without an end wall portion according to one or more embodiments of the present application;

[0024] Figure 6 is a schematic structural diagram of a housing according to one or more embodiments of the present application with the end wall removed from a second viewing angle;

[0025] Figure 7 It is a cross-sectional view of a second embodiment of a housing without an end wall portion according to one or more embodiments of the present application.

[0026] Figure numbers: vehicle 1; battery device 2; controller 3; motor 4; housing 20; first part 21; second part 22; battery cell 10; electrode assembly 100; middle area 110; edge area 120; housing 200; accommodating space 210; main side wall 220; exhaust groove 221; first groove section 2211; second groove section 2212; third groove section 2213; limiting protrusion 222; secondary side wall 230; end wall 240; explosion-proof component 300; length direction X; thickness direction Y; width direction Z. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0029] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of battery application fields, its market demand is also constantly expanding.

[0036] Batteries mentioned in this field can be divided into disposable batteries and rechargeable batteries according to whether they are rechargeable or not. Disposable batteries (PrimaryBattery) are also called "disposable" batteries and original batteries, because after they are exhausted, they can no longer be recharged and can only be discarded. Rechargeable batteries are also called secondary batteries (SecondaryBattery) or secondary batteries, storage batteries. The manufacturing materials and processes of rechargeable batteries are different from those of primary batteries. Its advantage is that it can be recycled many times after charging, and the output current load capacity of rechargeable batteries is higher than that of most disposable batteries. The common types of rechargeable batteries at present are: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries have the advantages of light weight, large capacity (the capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight), no memory effect, and have a very low self-discharge rate. Therefore, even though the price is relatively high, they are still widely used. Lithium-ion batteries are currently also widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively low, but they have a larger output and charging current, and also have a longer service life, but the cost is higher.

[0037] The battery described in the embodiments of the present application refers to a rechargeable battery or a disposable battery. The embodiments disclosed in the present application will be described below mainly by taking a lithium-ion battery as an example. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present application can be directly or indirectly applied to an appropriate device to power the device.

[0038] The present application provides an electric device, which may include but is not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc. Among them, the electric device may include a battery, and the electric device may provide electric energy through the battery to realize the corresponding function.

[0039] The present application also provides an electric vehicle, which may include a battery device.

[0040] Please refer to Figure 1 , Figure 1 is a schematic diagram of the structure of a vehicle according to one or more embodiments of the present application.

[0041] The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A battery device 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to power the motor 4, for example, for starting, navigating and driving the vehicle 1.

[0042] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0043] In order to improve the performance of the electrical device, the present application also provides a battery device, see Figure 2 , Figure 2 is a schematic diagram of the exploded structure of a battery device according to one or more embodiments of the present application.

[0044] The shape of the battery device 2 may include but is not limited to a square cylindrical shape or other arbitrary shapes.

[0045] In some embodiments, the battery device 2 may include a box 20 and a battery cell 10, and the battery cell 10 is accommodated in the box 20. The box 20 is used to provide a storage space for the battery cell 10, and the box 20 can adopt a variety of structures. In some embodiments, the box 20 may include a first part 21 and a second part 22, and the first part 21 and the second part 22 cover each other, and the first part 21 and the second part 22 jointly define a storage space for accommodating the battery cell 10. The second part 22 may be a hollow structure with one end open, and the first part 21 may be a plate-like structure, and the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 jointly define a storage space; the first part 21 and the second part 22 may also be hollow structures with one side open, and the open side of the first part 21 covers the open side of the second part 22.

[0046] In the battery device 2, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, the battery device 2 can also be a battery module formed by connecting multiple battery cells 10 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 20. The battery device 2 can also include other structures, for example, the battery device 2 can also include a busbar component for realizing electrical connection between the multiple battery cells 10.

[0047] The manufacturing methods of the battery cell 10 include stacking and winding, that is, the battery cell 10 is divided into stacking cells and winding cells. The stacking battery has a uniform current collection effect, a small internal resistance of the battery, and a large specific power, but in order to improve the precision, the mold precision is extremely high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. The winding battery is simple to make, and the equipment precision requirements for the production and assembly process are general, the production efficiency is high, and the cost is low. In terms of performance, the winding battery has excellent high and low temperature performance, charges very quickly, has an ultra-long life, a stable high output voltage, a solid structure, and strong shock resistance.

[0048] However, during multiple cycles of charge and discharge, the battery cell 10 will produce gas due to side reactions of the electrochemical reaction. As the gas content increases, the gas pressure inside the battery shell will also increase. If the gas cannot be properly guided to the outside of the shell, the service life of the battery cell 10 will be easily reduced.

[0049] In order to solve the technical problems existing in the related art, the present application provides a battery cell, see Figure 3 and Figure 4 , Figure 3 is a schematic diagram of the disassembled structure of a battery cell according to one or more embodiments of the present application. Figure 4 , Figure 4 It is a schematic structural diagram of a first viewing angle of a housing excluding an end wall portion according to one or more embodiments of the present application.

[0050] The battery cell 10 includes an electrode assembly 100 and a shell 200, the shell 200 is formed with a accommodating space 210, the shell 200 includes at least one main side wall portion 220, the main side wall portion 220 has an exhaust groove 221 and a limiting protrusion 222, the electrode assembly 100 is arranged in the accommodating space 210, in the length direction of the electrode assembly 100, the exhaust groove 221 corresponds to the edge area 120 of the electrode assembly 100, and the limiting protrusion 222 corresponds to the middle area 110 of the electrode assembly 100.

[0051] The electrode assembly 100 is a component in the battery cell 10 where electrochemical reactions occur. The number of electrode assemblies 100 can be one or more. The electrode assembly 100 can be formed by winding the positive electrode sheet and the negative electrode sheet into a cylindrical shape, and then the electrode assembly 100 is extruded in the diameter direction so that the electrode assembly 100 is formed with two relatively parallel planes, and the two sides of the two planes are relatively curled surfaces, and the area of ​​the large plane is larger than the area of ​​the curled surface. Therefore, when the electrode assemblies 100 are stacked, the gap between the electrode assemblies 100 is smaller, thereby improving the utilization rate of the accommodating space 210. In addition, during the cyclic charge and discharge process of the electrode assembly 100, due to the presence of stress, the middle part of the large plane of the electrode assembly 100 will deform before the parts on both sides of the large plane. In the length direction, the electrode assembly 100 is divided into a middle region 110 and an edge region 120. The edge region 120 is located at both ends of the electrode assembly 100 in the length direction, and the middle region 110 is located in the middle part of the electrode assembly 100 in the length direction. For easier understanding, the following examples are given, such as Figure 3 As shown, the electrode assembly 100 can be divided into five equal parts along the dotted line in the length direction, the three equal parts in the middle can be regarded as the middle area 110 of the electrode assembly 100, and the equal parts located at both ends of the electrode assembly 100 can be regarded as the edge area 120. Of course, there are other different ways to divide the middle area 110 and the edge area 120. This division method is just one example, and the specific division needs to be made according to the actual situation. The parts of the positive and negative electrodes with active materials constitute the main body of the electrode assembly 100, and the parts of the positive and negative electrodes without active materials each constitute the ear. The positive electrode ear and the negative electrode ear can be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the ear connects the electrode terminal to form a current loop.

[0052] The housing 200 may be in any shape, for example, the shape of the housing 200 includes but is not limited to square, cylindrical, prismatic, etc. The main side wall 220 may be any side wall of the housing 200, but the main side wall 220 needs to correspond to the large plane of the electrode assembly 100. For example, when the housing 200 is square, the side with a larger area among the six sides of the square housing 200 may be used as the main side wall 220 of this embodiment, so that the main side wall 220 is arranged opposite to the large plane of the electrode assembly 100. In some embodiments, the housing 200 may include an end cap and a shell, and the end cap refers to a component that covers the opening of the shell to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap may be adapted to the shape of the shell to match the shell. Optionally, the end cap may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 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. Functional components such as electrode terminals may be provided on the end caps for outputting current and connecting to external circuits. The end caps may also be made of a variety of materials, such as materials including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may be provided on the inner side of the end caps, and the insulating member may be used to isolate the direct connection between the housing 200 and the peripheral side of the end caps to reduce the risk of short circuit of the battery cell 10 and to improve the sealing of the battery cell 10. Exemplarily, the insulating member may be plastic or rubber, etc.

[0053] The exhaust groove 221 is disposed on the inner side of the main side wall 220. In other words, the exhaust groove 221 is a groove formed by the inner side of the main side wall 220 being recessed in a direction away from the accommodation space 210. The limiting protrusion 222 can be understood as a protrusion formed by the inner side of the main side wall 220 protruding in a direction close to the accommodation space 210. The exhaust groove 221 is located at a position where the main side wall 220 corresponds to the edge region 120 of the electrode assembly 100, and the limiting protrusion 222 is located at a position where the main side wall 220 corresponds to the middle region 110 of the electrode assembly 100. The exhaust groove 221 is connected to the accommodation space 210, so that the middle region 110 of the electrode assembly 100, which is prone to deformation, will preferentially contact the limiting protrusion 222, and then the edge region 120 of the electrode assembly 100 will avoid the exhaust groove 221. During the multiple cycles of charge and discharge of the battery cell 10, the accommodation space 210 may generate gas due to the side reaction of the electrochemical reaction, and the gas will enter the exhaust groove 221 and flow in the exhaust groove 221. Among them, the depth of the shell can be 0.6mm~1mm, and the depth of the exhaust groove can be 0.1mm~0.3mm. The depths of the shell 200 and the exhaust groove 221 are within the above range, so that the shell 200 has a higher structural strength and the exhaust groove 221 also has a higher exhaust efficiency.

[0054] Through the above embodiment, the electrode assembly 100 is arranged in the accommodating space 210 of the shell 200, and the main side wall portion 220 of the shell 200 has an exhaust groove 221 and a limiting protrusion 222. In the length direction X of the electrode assembly 100, the exhaust groove 221 corresponds to the edge area 120 of the electrode assembly 100, and the limiting protrusion 222 corresponds to the middle area 110 of the electrode assembly 100. This can make the middle area 110 of the electrode assembly 100, which is more prone to deformation, contact with the limiting protrusion 222 first after deformation, thereby alleviating the risk that the exhaust groove 221 is blocked by the deformation of the middle area 110 of the electrode assembly 100, resulting in the gas inside the shell 200 being unable to be discharged from the shell 200 from the exhaust groove 221, and improving the risk of more gas accumulating inside the shell 200 and damaging the performance of the battery cell 10.

[0055] In some embodiments, the main side wall portion 220 is provided with two exhaust grooves 221, and the two exhaust grooves 221 are located on both sides of the limiting protrusion 222 in the length direction X of the electrode assembly 100. The two ends of the electrode assembly 100 in the length direction X are the edge region 120 of the electrode assembly 100, and the main side wall portion 220 is provided with an exhaust groove 221 at two positions corresponding to the edge region 120, and the limiting protrusion 222 is located between the two exhaust grooves 221 in the length direction X, so that when the middle region 110 of the electrode assembly 100 is deformed and preferentially contacts the limiting protrusion 222, the edge region 120 of the electrode assembly 100 can simultaneously avoid the two exhaust grooves 221, and the main side wall portion 220 is provided with two exhaust grooves 221, which can further improve the exhaust efficiency of the housing 200, and can also alleviate the risk that the gas inside the housing 200 cannot be discharged from the housing 200 through the exhaust groove 221 due to the deformation of the middle region 110 of the electrode assembly 100 blocking the exhaust groove 221. The limiting protrusion 222 may be disposed adjacent to the exhaust groove 221, that is, the limiting protrusion 222 is connected to the exhaust groove 221 at both ends in the length direction X, or the limiting protrusion 222 may be spaced apart from the exhaust groove 221 in the length direction X, that is, the limiting protrusion 222 is spaced apart from the exhaust groove 221, and protrudes toward the direction close to the accommodation space 210 relative to the main side wall portion 220. Optionally, the limiting protrusion 222 is disposed adjacent to the exhaust groove 221, so that while the electrode assembly 100 and the exhaust groove 221 are avoided, the limiting protrusion 222 has less intrusion into the accommodation space 210, thereby allowing the accommodation space 210 to accommodate a larger volume of the electrode assembly 100.

[0056] In other embodiments, the main side wall portion 220 may be provided with three exhaust grooves 221, two exhaust grooves 221 are located on both sides of the limiting protrusion 222 in the length direction X, and another exhaust groove 221 is extended along the length direction X and corresponds to the middle area 110 of the electrode assembly 100. The limiting protrusion 222 can be divided into two parts in the width direction Z, and the two ends of the other exhaust groove 221 in the length direction X are respectively connected to the exhaust grooves 221 located on both sides of the limiting protrusion 222, so that the gas located in the middle area 110 of the electrode assembly 100 can be guided into the exhaust groove 221, thereby further improving the exhaust efficiency of the outer shell 200.

[0057] Further, the housing 200 includes two main sidewalls 220, which are arranged at intervals relative to each other in the thickness direction Y of the electrode assembly 100, and the electrode assembly 100 is located between the two main sidewalls 220. The housing 200 includes two main sidewalls 220, which are arranged at intervals relative to each other in the thickness direction Y of the electrode assembly 100, and the two main sidewalls 220 are arranged opposite to the two opposite sides of the electrode assembly 100 in the thickness direction Y of the electrode assembly 100. The inner side of each main side wall portion 220 may be provided with two exhaust grooves 221 and a limiting protrusion 222, and the limiting protrusion 222 is located between the two exhaust grooves 221, so that when the middle area 110 of the electrode assembly 100 is deformed, it can preferentially contact the two limiting protrusions 222 set in the thickness direction Y of the electrode assembly 100, so that the edge area 120 of the electrode assembly 100 can avoid the corresponding exhaust grooves 221, thereby further improving the exhaust efficiency of the outer shell 200.

[0058] In some embodiments, the exhaust groove 221 is extended along the width direction Z of the electrode assembly 100. The exhaust groove 221 is arranged on the inner side of the main side wall portion 220 and extends along the width direction Z of the electrode assembly 100, thereby extending the length of the exhaust groove 221 and increasing the length of the exhaust groove 221 to improve the exhaust efficiency of the housing 200. Within the range corresponding to the main side wall portion 220 and the edge area 120 of the electrode assembly 100, the extension path of the exhaust groove 221 in the width direction Z can be a straight line parallel to the width direction Z, or a curve, or can be an oblique line. Optionally, the extension path of the exhaust groove 221 is a straight line parallel to the width direction Z, which can make the exhaust groove 221 have a larger volume, thereby more efficiently exhausting the gas from the housing 200.

[0059] See also Figure 5 , Figure 5 It is a cross-sectional view of a first embodiment of a housing without an end wall portion according to one or more embodiments of the present application.

[0060] In some embodiments, the exhaust groove 221 includes a first groove section 2211, and the first groove section 2211 and the limiting protrusion 222 are arranged adjacent to each other. In the length direction X, the farther the first groove section 2211 is from the limiting protrusion 222, the greater the depth of the first groove section 2211. The first groove section 2211 may be arranged adjacent to the limiting protrusion 222 in the length direction X. Specifically, the first groove section 2211 is connected to the limiting protrusion 222 at one side close to the limiting protrusion 222. The size of the first groove section 2211 in the thickness direction Y of the electrode assembly 100 gradually increases with the increase of the distance from the limiting protrusion 222. The size of the first groove section 2211 in the thickness direction Y of the electrode assembly 100 may be understood as the depth of the first groove section 2211. Exemplarily, the size of the first slot section 2211 in the thickness direction Y of the electrode assembly 100 may increase linearly as the distance from the limiting protrusion 222 increases. In other words, the bottom wall of the first slot section 2211 may be a straight plate, one end of the straight plate is connected to one end of the limiting protrusion 222, and the other end of the straight plate extends in the length direction X and the thickness direction Y and is away from the limiting protrusion 222. In another exemplary embodiment, the size of the first slot section 2211 in the thickness direction Y of the electrode assembly 100 may increase in a curve as the distance from the limiting protrusion 222 increases. In other words, the cross section of the first slot section 2211 is a curve, and the curve may protrude into the slot of the first slot section 2211, so that the first slot section 2211 and the limiting protrusion 222 can be smoothly transitioned, which can reduce the risk of damaging the electrode assembly 100 due to excessive pressure at the transition position between the first slot section 2211 and the limiting protrusion 222 when the electrode assembly 100 is deformed. Optionally, the dimension of the first groove segment 2211 in the thickness direction Y of the electrode assembly 100 increases linearly with the increase of the distance from the limiting protrusion 222, so that when the electrode assembly 100 is deformed, the pressure at the connection position of the first groove segment 2211 and the limiting protrusion 222 is smaller, and the volume of the first groove segment 2211 can be larger, thereby improving the exhaust efficiency of the outer shell 200, and alleviating the risk of reducing the overall strength of the outer shell 200 due to the greater stress at the connection between the first groove segment 2211 and the limiting protrusion 222 due to the sudden structural change.

[0061] In some embodiments, the exhaust groove 221 includes a second groove section 2212 , which is connected to the first groove section 2211 , and is located on a side of the first groove section 2211 away from the limiting protrusion 222 , and the depth of the second groove section 2212 is greater than the depth of the first groove section 2211 . The second groove section 2212 is connected to the side of the first groove section 2211 away from the limiting protrusion 222, and the dimension of the second groove section 2212 in the thickness direction Y of the electrode assembly 100 is larger than that of the first groove section 2211. The dimension of the second groove section 2212 in the thickness direction Y of the electrode assembly 100 can be understood as the depth of the second groove section 2212. In other words, the depth of the side of the first groove section 2211 away from the limiting protrusion 222 is greater than the depth of the side of the first groove section 2211 close to the limiting protrusion 222. One side of the second groove section 2212 is connected to the side of the first groove section 2211 away from the limiting protrusion 222, and the depth of the second groove section 2212 is greater than the depth of the first groove section 2211, thereby increasing the volume of gas that can be accommodated in the exhaust groove 221. The second slot section 2212 can be set to extend in the length direction X with the side of the first slot section 2211 away from the limiting protrusion 222 as the starting point, or the second slot section 2212 can be further recessed in the thickness direction Y away from the electrode assembly 100 on the basis of the first slot section 2211 to increase the gas holding capacity of the exhaust groove 221, thereby further improving the exhaust efficiency of the housing 200. The shape of the second slot section 2212 can be set according to actual conditions, for example, the shape of the second slot section 2212 can be strip-shaped, or the shape of the second slot section 2212 can be other curved shapes.

[0062] In some embodiments, the exhaust groove 221 includes a third groove section 2213, which is located on the side of the second groove section 2212 away from the first groove section 2211, and the third groove section 2213 is connected to the second groove section 2212. In the length direction X, the further away the third groove section 2213 is from the second groove section 2212, the smaller the depth is. The shape of the third groove section 2213 can be set according to actual conditions, for example, the bottom wall of the third groove section 2213 is a straight plate, that is, the inclination angle of the bottom wall of the third groove section 2213 relative to the plane where the main side wall portion 220 is located is constant, or the bottom wall of the third groove section 2213 is curved, that is, the inclination angle of the bottom wall of the third groove section 2213 relative to the plane where the main side wall portion 220 is located gradually decreases, or the third groove section 2213 is a straight plate, and a chamfering process is performed on the side of the third groove section 2213 away from the second groove section 2212 to smooth the position where the third groove section 2213 is connected to the main side wall portion 220. By connecting the third slot section 2213 and the second slot section 2212, the volume of the exhaust groove 221 can be further increased to improve the exhaust efficiency of the housing 200. In addition, in the length direction X, the further away the third slot section 2213 is from the second slot section 2212, the smaller the depth of the third slot section 2213 is, so that the connection between the side of the third slot section 2213 away from the second slot section 2212 and the main side wall portion 220 is smoother, which can alleviate the risk of reducing the overall strength of the housing 200 due to greater stress at the corresponding position caused by the sudden change in the depth of the third slot section 2213.

[0063] See also Figure 6 , Figure 6 It is a schematic structural diagram of a second viewing angle of a housing excluding an end wall portion according to one or more embodiments of the present application.

[0064] In some embodiments, the exhaust groove 221 includes a fourth slot segment and a fifth slot segment, and the fourth slot segment and the fifth slot segment are respectively connected to the two sides of the second slot segment 2212 in the width direction Z, and the second slot segment 2212 is connected to the fourth slot segment and the fifth slot segment. In the width direction Z, the farther the fourth slot segment is from the second slot segment 2212, the smaller the depth of the fourth slot segment, and the farther the fifth slot segment is from the second slot segment 2212, the smaller the depth of the fifth slot segment, which can alleviate the risk of reducing the overall strength of the housing 200 due to the greater stress at the corresponding position caused by the sudden change in the depth of the second slot segment 2212. Figure 6 In the figure, the dotted line portion represents the exhaust groove, and since the exhaust groove is inside, it is represented by a dotted line.

[0065] Furthermore, the connection between the fourth and fifth slot segments, which are away from the second slot segment 2212, and the main side wall portion 220 is provided with a chamfer, which can be in the shape of an inclined plane or an arc surface. Optionally, the connection is in the shape of an arc surface, so as to further alleviate the risk of reducing the overall strength of the housing 200 due to the greater stress at the corresponding position caused by the sudden change in depth of the fourth and fifth slot segments. In addition, the connection between the first and third slot segments 2211 and 2213, which are away from the second slot segment 2212, and the main side wall portion 220 can also be provided with a chamfer, so as to alleviate the risk of reducing the overall strength of the housing 200 due to the greater stress at the corresponding position caused by the sudden change in depth at the connection between the first and third slot segments 2211 and 2213 and the main side wall portion 220.

[0066] In some embodiments, the housing 200 includes a secondary side wall portion 230, the secondary side wall portion 230 is connected to the main side wall portion 220, the exhaust groove 221 is located between the limiting protrusion 222 and the secondary side wall portion 230, and the third groove section 2213 is spaced apart from the secondary side wall portion 230 in the length direction X. The housing 200 also includes a secondary side wall portion 230, the secondary side wall portion 230 is adjacent to the main side wall portion 220, and the two ends of the secondary side wall portion 230 are respectively connected to one main side wall portion 220, and there may also be two secondary side wall portions 230, the two secondary side wall portions 230 are arranged oppositely, and each of the two ends of the secondary side wall portion 230 in the length direction X is respectively connected to the same end of a main side wall portion 220, so that the secondary side wall portion 230 and the main side wall portion 220 are connected to each other, and the electrode assembly 100 is surrounded between the two secondary side wall portions 230 and the two main side wall portions 220. In the length direction X, the exhaust groove 221 is located between the limiting protrusion 222 and the secondary side wall portion 230, and the third groove section 2213 is spaced apart from the secondary side wall portion 230 in the length direction X, so that one end of the secondary side wall portion 230 in the thickness direction Y of the electrode assembly 100 is first connected to the portion of the primary side wall portion 220 where the exhaust groove 221 is not provided, that is, there is a thicker primary side wall portion 220 between the secondary side wall portion 230 and the exhaust groove 221. Therefore, the third groove section 2213 is spaced apart from the secondary side wall portion 230, which can alleviate the risk of low overall structural strength of the housing 200 due to the thin thickness of the connection between the secondary side wall portion 230 and the primary side wall portion 220. Among them, the size of the main side wall portion 220 in the length direction X is larger than the size of the secondary side wall portion 230 in the thickness direction Y, so that the opposing surface of the middle area 110 of the electrode assembly 100 and the limiting protrusion 222 is larger. When the middle area 110 of the electrode assembly 100 is deformed, the edge area of ​​the electrode assembly 100 is easier to avoid the exhaust groove 221.

[0067] See also Figure 7 , Figure 7 It is a cross-sectional view of a second embodiment of a housing without an end wall portion according to one or more embodiments of the present application.

[0068] In some embodiments, the housing 200 includes a secondary side wall portion 230 , which is connected to the primary side wall portion 220 , the exhaust groove 221 is located between the limiting protrusion 222 and the secondary side wall portion 230 , and the second groove section 2212 extends along the length direction X to the secondary side wall portion 230 . The housing 200 may include two main side wall portions 220 and two secondary side wall portions 230, and is formed by the secondary side wall portions 230 and the main side wall portions 220 being alternately connected to each other. The main side wall portion 220 is provided with an exhaust groove 221 and a limiting protrusion 222. The exhaust groove 221 is located between the limiting protrusion 222 and the secondary side wall portion 230, and the exhaust groove 221 includes a first groove section 2211 and a second groove section 2212. The first groove section 2211 and the second groove section 2212 are connected in the length direction X, one end of the second groove section 2212 is connected to the first groove section 2211, and the other end of the second groove section 2212 extends toward the secondary side wall portion 230 in the length direction X, and extends to the connection between the main side wall portion 220 and the secondary side wall portion 230, so that the second groove section 2212 has a larger volume, thereby increasing the volume of the exhaust groove 221, and further improving the exhaust efficiency of the housing 200.

[0069] In other embodiments, the shell 200 includes two main side wall portions 220, each main side wall portion 220 includes two exhaust grooves 221 and a limiting protrusion 222, wherein at least one exhaust groove 221 of the shell 200 may include a first groove section 2211, a second groove section 2212 and a third groove section 2213, and the third groove section 2213 is spaced apart from the secondary side wall portion 230. At least one exhaust groove 221 of the shell 200 may also include only the first groove section 2211 and the second groove section 2212, and the second groove section 2212 extends toward the secondary side wall portion 230 along the length direction X and extends to the connection between the main side wall portion 220 and the secondary side wall portion 230, thereby enabling the shell 200 to have both greater exhaust efficiency and higher structural strength.

[0070] In some embodiments, in the width direction Z of the electrode assembly 100, the size of the exhaust groove 221 is greater than the size of the electrode assembly 100. In the width direction Z of the electrode assembly 100, the size of the exhaust groove 221 is greater than the size of the electrode assembly 100, so that the exhaust groove 221 extends out of the electrode assembly 100 in the width direction Z, thereby reducing the risk of the electrode assembly 100 blocking both ends of the exhaust groove 221 in the width direction Z, so that the gas in the accommodation space 210 is discharged through the exhaust groove 221. In addition, the exhaust groove 221 extends out of the electrode assembly 100 in the width direction Z, so that there is a certain redundant space between the electrode assembly 100 and the end wall portion 240, and the redundant space is connected to the exhaust groove 221, so that when the electrode assembly 100 generates a large amount of gas, the redundant space can have a buffering effect on the generated gas, reducing the risk of excessive internal pressure of the battery cell 10 due to a large amount of gas generated in the accommodation space 210.

[0071] In some embodiments, the housing 200 includes an end wall portion 240, which is connected to the main side wall portion 220 in the width direction Z of the electrode assembly 100, and the battery cell 10 includes an explosion-proof member 300, which is arranged on the end wall portion 240, and the exhaust groove 221 extends at one end close to the end wall portion 240, and the other end extends to the side of the housing 200 away from the end wall portion 240. The housing 200 also includes an end wall portion 240, which is located on one side of the housing 200 in the width direction Z, and the end wall portion 240, the main side wall portion 220, the secondary side wall portion 230, and the bottom wall arranged relative to the end wall portion 240 constitute a closed housing 200. It can be understood that the end wall portion 240 can be a part of the end cover, and the end cover can also include an explosion-proof member 300, which is arranged on the end wall portion 240, and the explosion-proof member 300 can be in a closed state to isolate the accommodating space 210 from the outside. The explosion-proof member 300 may also be in an open state, and the storage space 210 is connected to the outside through the explosion-proof member 300, so that the gas inside the storage space 210 is discharged from the storage space 210 through the explosion-proof member 300. Exemplarily, the explosion-proof member 300 can be used to release the internal gas to reduce the internal pressure of the storage space 210 when the internal pressure or temperature of the battery cell 10 reaches a threshold. One end of the exhaust groove 221 can extend to the connection between the end wall portion 240 and the shell 200 in the width direction Z of the electrode assembly 100, or one end of the exhaust groove 221 is close to the end wall portion 240, and there is a gap between the end wall portion 240. Then, the end of the exhaust groove 221 close to the end wall portion 240 can be connected to the explosion-proof member 300, and the exhaust groove 221 can guide the gas between the end wall portion 240 and the end wall portion 240 to the explosion-proof member 300, and then the gas can be efficiently discharged from the storage space 210 through the explosion-proof member 300.

[0072] To summarize, the electrode assembly 100 is arranged in the accommodating space 210 of the outer shell 200, and the main side wall portion 220 of the outer shell 200 has an exhaust groove 221 and a limiting protrusion 222. In the length direction X of the electrode assembly 100, the exhaust groove 221 corresponds to the edge area 120 of the electrode assembly 100, and the limiting protrusion 222 corresponds to the middle area 110 of the electrode assembly 100. This can make the middle area 110 of the electrode assembly 100, which is more prone to deformation, contact with the limiting protrusion 222 first after deformation, thereby alleviating the risk that the exhaust groove 221 is blocked by the deformation of the middle area 110 of the electrode assembly 100, resulting in the gas inside the outer shell 200 being unable to be discharged from the outer shell 200 from the exhaust groove 221, and improving the risk of more gas accumulating inside the outer shell 200 and damaging the performance of the battery cell 10.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell includes an electrode assembly and a shell, the shell forms a accommodating space, the shell includes at least one main side wall portion, the main side wall portion has an exhaust groove and a limiting protrusion, the electrode assembly is arranged in the accommodating space, in the length direction of the electrode assembly, the exhaust groove corresponds to the edge area of ​​the electrode assembly, and the limiting protrusion corresponds to the middle area of ​​the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The main side wall portion is provided with two exhaust grooves, and the two exhaust grooves are located on both sides of the limiting protrusion in the length direction of the electrode assembly.

3. The battery cell according to claim 1, characterized in that: The exhaust groove is extended along a width direction of the electrode assembly.

4. The battery cell according to claim 1, characterized in that: The exhaust groove includes a first groove section, and the first groove section and the limiting protrusion are arranged adjacent to each other. In the length direction, the farther the first groove section is from the limiting protrusion, the greater the depth of the first groove section is.

5. The battery cell according to claim 4, characterized in that: The exhaust groove includes a second groove section, the second groove section is connected to the first groove section, the second groove section is located on a side of the first groove section away from the limiting protrusion, and the depth of the second groove section is greater than the depth of the first groove section.

6. The battery cell according to claim 5, characterized in that: The exhaust groove includes a third groove section, which is located on a side of the second groove section away from the first groove section, and is connected to the second groove section. In the length direction, the further away the third groove section is from the second groove section, the smaller its depth is.

7. The battery cell according to claim 6, characterized in that: The housing comprises a secondary side wall portion, the secondary side wall portion is connected to the primary side wall portion, the exhaust groove is located between the limiting protrusion and the secondary side wall portion, and the third groove section is spaced apart from the secondary side wall portion in the length direction.

8. The battery cell according to claim 5, characterized in that: The housing comprises a secondary side wall portion, the secondary side wall portion is connected to the primary side wall portion, the exhaust groove is located between the limiting protrusion and the secondary side wall portion, and the second groove section extends to the secondary side wall portion along the length direction.

9. The battery cell according to claim 1, characterized in that: The housing includes two main side wall portions, the two main side wall portions are arranged relatively spaced apart in the thickness direction of the electrode assembly, and the electrode assembly is located between the two main side wall portions.

10. The battery cell according to claim 1, characterized in that: In a width direction of the electrode assembly, a size of the exhaust groove is larger than a size of the electrode assembly.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The shell includes an end wall portion, which is connected to the main side wall portion in the width direction of the electrode assembly. The battery cell includes an explosion-proof component, which is arranged on the end wall portion. One end of the exhaust groove extends to the side close to the end wall portion, and the other end extends to the side of the shell away from the end wall portion.

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

13. An electrical device, characterized in that: The electrical device comprises the battery device as claimed in claim 12.

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