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 a shell, an electrode assembly and an anti-explosion valve, an accommodating space is formed in the shell, the shell comprises a wall part, and the electrode assembly is positioned in the accommodating space; the explosion-proof valve is arranged on the wall part; the shell is provided with a gas flow channel communicated with the containing space, and at least one end of the gas flow channel extends to be close to the wall part. Therefore, the shell is internally provided with the gas flow channel and the accommodating space which are communicated with each other, and at least one end of the gas flow channel extends to be close to the wall part, so that after the electrode assembly in the accommodating space generates a large amount of gas in the charging and discharging process of the single battery, the gas is guided to the anti-explosion valve on the wall part through the gas flow channel; and further, the gas is efficiently discharged out of the accommodating space through the anti-explosion valve, 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 technical field of batteries, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to sustainable development, which promotes 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 ability, high working voltage, environmental protection and low self-discharge.

[0003] The battery includes one or more battery monomers. During multiple charge and discharge cycles, gas is generated inside the battery monomer due to the side reaction of electrochemical reaction. As the gas content increases, the gas pressure inside the battery shell also increases. If the gas cannot be well guided outside the shell, the service life of the battery monomer will be reduced. Content of the utility model

[0004] The main purpose of the present application is to provide a battery monomer, a battery device and a power utilization device, which aims to solve the above technical problems existing in the prior art.

[0005] To solve the above problems, the present application provides a battery monomer, which comprises a shell, an electrode assembly and an explosion-proof valve. The shell forms a containing space, the shell comprises a wall portion, and the electrode assembly is located in the containing space. The explosion-proof valve is arranged on the wall portion. The shell is provided with a gas flow channel, and at least one end of the gas flow channel extends to near the wall portion. In this way, the gas flow channel and the containing space are in communication with each other, and at least one end of the gas flow channel extends to near the wall portion. This can make the electrode assembly in the containing space generate a large amount of gas during the charge and discharge process of the battery monomer, and the gas is guided to the explosion-proof valve on the wall portion through the gas flow channel, and then the gas is efficiently discharged from the containing space through the explosion-proof valve, thereby improving the risk of damaging the service performance of the battery monomer due to the accumulation of a large amount of gas in the shell.

[0006] In some embodiments, the gas flow channel comprises a gas sub-flow channel, one end of the gas sub-flow channel extends to near the wall portion, and the other end of the gas sub-flow channel extends to the side of the shell away from the wall portion. In this way, one end of the gas sub-flow channel extends to near the wall portion, and the other end of the gas sub-flow channel extends to the side of the shell away from the wall portion. At least part of the gas on the side of the shell away from the wall portion can be guided to the explosion-proof valve through the gas sub-flow channel, and the gas is further efficiently discharged from the containing space through the explosion-proof valve.

[0007] In some embodiments, the number of the gas sub-flow channels is multiple, and the multiple gas sub-flow channels are arranged at intervals. In this way, opening multiple gas sub-flow channels at the same time can improve the efficiency of guiding the gas to the explosion-proof valve and further efficiently discharge the gas from the accommodation space through the explosion-proof valve.

[0008] In some embodiments, the inner side wall of the shell is recessed to form the gas sub-flow channel. In this way, the inner side wall of the shell is recessed to form the gas sub-flow channel, which can reduce the difficulty of forming the gas sub-flow channel and improve the production efficiency.

[0009] In some embodiments, the inner side wall of the shell is provided with at least two protrusions, and the at least two protrusions are arranged at intervals to form the gas sub-flow channel. In this way, the inner side wall of the shell is provided with at least two protrusions, and the at least two protrusions are arranged at intervals to form the gas sub-flow channel, which can reduce the difficulty of forming the gas sub-flow channel and improve the production efficiency.

[0010] In some embodiments, the width of each gas sub-flow channel is between 3mm and 15mm. In this way, the risk of stress concentration at the corresponding position of the gas sub-flow channel due to the small width of the gas sub-flow channel can be alleviated, and the risk of reducing the overall structural strength of the shell due to the large width of the gas sub-flow channel can be alleviated.

[0011] In some embodiments, the depth of the gas sub-flow channel is 0.5 to 5 times the wall thickness of the shell. In this way, the risk of low gas guiding efficiency due to the small depth of the gas sub-flow channel can be alleviated, and the risk of abnormal damage to the shell due to the large depth of the gas sub-flow channel can be alleviated.

[0012] In some embodiments, the shell has two oppositely arranged first side walls and two oppositely arranged second side walls, the surface area of the first side wall is larger than that of the second side wall, and the gas flow channel is arranged on at least one of the first side walls. In this way, the gas flow channel is arranged only on the first side wall with a larger surface area, which can improve the structural strength of the shell and reduce the difficulty of forming the gas sub-flow channel and improve the production efficiency.

[0013] In some embodiments, the outer side of the shell away from the accommodation space is provided with a protruding structure, and the protruding structure is arranged corresponding to the gas flow channel in the thickness direction of the side wall of the shell. In this way, the protruding structure is arranged on the outer side of the shell away from the accommodation space, which facilitates the mounting and fixing of the battery monomer through the protruding structure. At the same time, the protruding structure is arranged corresponding to the gas flow channel in the thickness direction of the side wall of the shell, which can facilitate the synchronous forming of the protruding structure and the gas flow channel and improve the production efficiency.

[0014] In some embodiments, the inner side wall of the shell is provided with at least two protrusions, the at least two protrusions are arranged at intervals to form the gas flow channel, and / or the outer side of the shell away from the accommodating space is provided with a groove structure, and the groove structure and the protrusions are arranged correspondingly in the thickness direction of the side wall of the shell. In this way, the groove structure and the protrusions are arranged correspondingly in the thickness direction of the side wall of the shell, which can facilitate synchronous forming of the groove structure and the gas sub-flow channel, and improve production efficiency.

[0015] In some embodiments, the battery cell includes a positive electrode post and a negative electrode post, and the positive electrode post and the negative electrode post are arranged at intervals on the side of the shell away from the wall portion. In this way, the positive electrode post and the negative electrode post are arranged at intervals on the area of the shell other than the wall portion, which can improve the influence of the explosion-proof valve on the positive electrode post and the negative electrode post.

[0016] To solve the above problems, the application provides a battery device, which includes the battery cell as described above.

[0017] To solve the above problems, the application provides a power utilization device, which includes the battery device as described above. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

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

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

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

[0022] Figure 4 is a first structural schematic diagram of a shell without a wall portion according to one or more embodiments of the present application;

[0023] Figure 5 is Figure 4 is a top view structural schematic diagram of the shell without the wall portion shown;

[0024] Figure 6 is a second structural schematic diagram of a shell without a wall portion according to one or more embodiments of the present application;

[0025] Figure 7 is Figure 6 is a top view structural schematic diagram of the shell removing the wall part;

[0026] Figure 8 is a first top view structural schematic diagram of the shell removing the wall part according to one or more embodiments of the present application;

[0027] Figure 9 is a second top view structural schematic diagram of the shell removing the wall part according to one or more embodiments of the present application;

[0028] Figure 10 is a side view of a first structure of a battery monomer according to one or more embodiments of the present application;

[0029] Figure 11 is a side view of a second structure of a battery monomer according to one or more embodiments of the present application;

[0030] Figure 12 is a side view of a third structure of a battery monomer according to one or more embodiments of the present application.

[0031] Reference signs: vehicle 1; battery device 2; controller 3; motor 4; box 20; first part 21; second part 22; battery monomer 10; shell 100; wall part 101; accommodating space 110; gas flow channel 120; gas sub-flow channel 121; convex strip 130; first side wall 140; second side wall 150; electrode assembly 200; explosion-proof valve 300; positioning structure 160; positioning convex 161; positioning groove 162; positive pole 400; negative pole 500; width size D. DETAILED DESCRIPTION

[0032] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0034] 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 explicitly specified and limited.

[0035] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] 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, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric transportation tools and aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0041] The battery mentioned in the art can be divided into primary battery and rechargeable battery according to whether it can be charged. The primary battery is also called "disposable" battery and primary cell, because it cannot be charged for use after its power is consumed, and can only be discarded. The rechargeable battery is also called secondary battery or secondary cell, storage battery. The manufacturing materials and process of rechargeable battery are different from those of primary battery, and its advantage is that it can be used repeatedly after charging. The output current load of rechargeable battery is higher than that of most primary batteries. The common types of rechargeable batteries at present are: lead-acid battery, nickel-hydrogen battery and lithium-ion battery. Lithium-ion battery has the advantages of light weight, large capacity (the capacity is 1.5 times to 2 times of the same weight of nickel-hydrogen battery), no memory effect and very low self-discharge rate, so even if the price is relatively high, it is still widely used. Lithium-ion battery is also widely used in pure electric vehicles and hybrid electric vehicles. The capacity of lithium-ion battery used for such purpose is relatively low, but it has high output, charging current and long service life, but the cost is high.

[0042] The battery described in the embodiments of the present application refers to a rechargeable battery or a primary battery. Hereinafter, the embodiments of the present application will be mainly described taking lithium-ion battery as an example. It should be understood that the embodiments of 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 appropriate devices to power the devices.

[0043] The present application provides a power consuming device, which can include but is not limited to mobile phones, tablets, notebook computers, electric toys, electric tools, electric vehicles, electric vehicles, ships, spacecraft and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc. Spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc. Among them, the power consuming device can include a battery, and the power consuming device can provide electric energy through the battery to realize the corresponding function.

[0044] The present application also provides an electric vehicle, which can include a battery device.

[0045] Please refer to Figure 1 ,Figure 1 is a structural schematic diagram of a vehicle according to one or more embodiments of the present application.

[0046] The vehicle 1 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1 is internally provided with a battery device 2, which can be arranged at the bottom, the head, or the tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as an operating power source of the vehicle 1. The vehicle 1 can further include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the power demand of the vehicle 1 during starting, navigation, and driving.

[0047] In some embodiments of the present application, the battery device 2 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0048] In order to improve the performance of the power consuming device, the present application further provides a battery device, which is described with reference to Figure 2 , Figure 2 is an exploded structural schematic diagram of a battery device according to one or more embodiments of the present application.

[0049] The shape of the battery device 2 can include but is not limited to a square cylinder or any other shape.

[0050] In some embodiments, the battery device 2 can include a box body 20 and a battery cell 10, and the battery cell 10 is accommodated in the box body 20. The box body 20 is used to provide an accommodation space for the battery cell 10, and the box body 20 can adopt various structures. In some embodiments, the box body 20 can include a first part 21 and a second part 22, and the first part 21 and the second part 22 are mutually covered. The first part 21 and the second part 22 jointly define an accommodation space for accommodating the battery cell 10. The second part 22 can be a hollow structure with one end open, and the first part 21 can be a plate structure, which is covered on the open side of the second part 22 to jointly define the accommodation space with the second part 22. The first part 21 and the second part 22 can also be hollow structures with one side open, and the open side of the first part 21 is covered on the open side of the second part 22.

[0051] In the battery device 2, the battery cells 10 can be multiple, and the multiple battery cells 10 can be connected in series or in parallel or in a mixed manner, where the mixed manner means that the multiple battery cells 10 are connected in series and in parallel. The multiple battery cells 10 can be directly connected in series or in parallel or in a mixed manner, and then the multiple battery cells 10 are accommodated in the box 20 as a whole. Of course, the battery device 2 can also be that the multiple battery cells 10 are connected in series or in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole and are accommodated in the box 20. The battery device 2 can also include other structures, for example, the battery device 2 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 10.

[0052] The manufacturing methods of the battery cell 10 include the laminated type and the winding type, that is, the battery cell 10 is divided into the laminated battery and the winding battery. The laminated battery has uniform current collection effect and small internal resistance, and has large specific power. However, in order to improve the precision, the mold precision is required to be very high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. The winding battery is simple to manufacture, and the manufacturing and assembly processes generally require equipment precision, have high production efficiency, and have low cost. In terms of performance, the winding battery has excellent high and low temperature performance, very fast charging, super long life, stable high output voltage, and strong structure and shock resistance.

[0053] However, during multiple charging and discharging cycles, the battery cell generates gas due to the side reaction of the electrochemical reaction. As the gas content increases, the gas pressure in the battery shell also increases. If the gas cannot be well guided to the outside of the shell, the service life of the battery cell is easily reduced.

[0054] To solve the technical problems in the related art, the battery cell is provided in the present application, referring to Figure 3 , Figure 3 is a disassembled structural schematic diagram of the battery cell according to one or more embodiments of the present application.

[0055] The battery cell 10 includes a shell 100, an electrode assembly 200, and an explosion-proof valve 300. The shell 100 forms an accommodation space 110, and the shell 100 includes a wall portion 101. The electrode assembly 200 is located in the accommodation space 110. The explosion-proof valve 300 is arranged on the wall portion 101. The shell 100 is provided with a gas flow channel 120, and at least one end of the gas flow channel 120 extends to the vicinity of the wall portion 101.

[0056] The shell 100 can have any shape, for example, the shape of the shell 100 includes but is not limited to a square, a cylinder, a prism, etc. The wall portion 101 can be any side wall of the shell 100, for example, when the shell 100 is square, the six side faces of the square shell 100 can all be the wall portion 101 of the present embodiment. In some embodiments, the shell 100 can include an end cover and a housing, the end cover refers to a component that covers the opening of the housing to isolate the internal environment of the battery monomer 10 from the external environment. Without limitation, the shape of the end cover can be adapted to the shape of the housing to fit the housing. Alternatively, the end cover can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover is not easily deformed when subjected to extrusion and collision, so that the battery monomer 10 can have higher structural strength, and the safety performance can also be improved. The end cover can be provided with functional components such as electrode terminals for current output and connection with external circuits. The material of the end cover can also be various, such as the material of the end cover includes but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating piece can also be provided on the inner side of the end cover, which can be used to isolate the electrical connection components in the housing from the end cover to reduce the risk of short circuit. For example, the insulating piece can be plastic, rubber, etc. The wall portion 101 can be the end cover described above. The housing is a component for fitting the end cover to form the accommodation space 110 of the battery monomer 10, wherein the accommodation space 110 can be used to accommodate the electrode assembly 200, the electrolyte and other components. The housing and the end cover can be independent components, an opening can be provided on the housing, and the end cover is covered on the opening to form the accommodation space 110 of the battery monomer 10. Without limitation, the end cover and the housing can also be integrated, specifically, the end cover and the housing can form a common connecting surface before other components enter the housing, and when it is necessary to encapsulate the interior of the housing, the end cover is covered on the housing. The housing can have various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly 200. The material of the housing can be various, such as the material of the housing includes but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0057] The electrode assembly 200 is a component in which electrochemical reactions occur in the battery cell 10. The number of electrode assemblies 200 can be one or more. The electrode assembly 200 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and an insulator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 200, and portions without active materials that each constitute a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at two ends of the main body, respectively. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop. In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and an insulator. During charging and discharging of the battery cell 10, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The insulator is provided between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through.

[0058] The explosion-proof valve 300 is fixedly connected with the wall portion 101. The explosion-proof valve 300 can be in a closed state to isolate the accommodation space from the outside, or the explosion-proof valve 300 can be in an open state to communicate the inside of the accommodation space 110 with the outside of the accommodation space 110 through the explosion-proof valve 300, so that the gas inside the accommodation space 110 can exit the accommodation space 110 through the explosion-proof valve 300. Illustratively, the explosion-proof valve 300 can be used to release the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. In some embodiments, a pressure relief hole can be provided in the wall portion 101, the pressure relief hole penetrating through the opposite surfaces of the wall portion 101, and the explosion-proof valve 300 can block the pressure relief hole, so that the gas in the accommodation space 110 can exit the inside of the housing 100 through the explosion-proof valve 300. Illustratively, during multiple charging and discharging cycles of the battery cell 10, gas can be generated in the accommodation space 110 due to side reactions of electrochemical reactions. As the amount of gas increases, the internal pressure of the accommodation space 110 also increases. The increase in the internal pressure of the housing 100 can easily cause the housing 100 of the battery cell 10 to deform, thereby causing the structural strength of the housing 100 to fail. When the internal pressure of the battery cell 10 reaches a threshold value, the internal pressure of the accommodation space 110 can be released through the explosion-proof valve 300.

[0059] The gas flow channel 120 can be formed in the inner side wall of the shell 100, and the gas flow channel 120 can be in communication with the accommodation space 110 in which the electrode assembly 200 is located. The electrode assembly 200 can be arranged to avoid the gas flow channel 120. During the charging and discharging cycles of the battery cell 10, the accommodation space 110 can generate gas due to the side reactions of the electrochemical reaction. The gas can enter the gas flow channel 120 and flow in the gas flow channel 120. The shape and size of the gas flow channel 120 can be set according to actual conditions. At least one end of the gas flow channel 120 extends to the position close to the wall portion 101. The gas in the gas flow channel 120 can be guided to the position close to the wall portion 101, and then discharged from the accommodation space 110 through the explosion-proof valve 300.

[0060] According to the above-mentioned embodiments, the shell 100 is provided with the gas flow channel 120 and the accommodation space 110 in communication with each other, and at least one end of the gas flow channel 120 extends to the position close to the wall portion 101. When the electrode assembly 200 in the accommodation space 110 generates a large amount of gas during the charging and discharging of the battery cell 10, the gas can be guided to the explosion-proof valve 300 on the wall portion 101 through the gas flow channel 120, and then discharged from the accommodation space 110 through the explosion-proof valve 300, thereby improving the risk of damage to the use performance of the battery cell 10 due to the accumulation of a large amount of gas in the shell.

[0061] Referring to Figures 4 to 7 , Figure 4 is a first structural schematic view of the shell 100 without the wall portion 101 according to one or more embodiments of the present application. Figure 5 is Figure 4 a top view structural schematic view of the shell 100 without the wall portion 101. Figure 6 is a second structural schematic view of the shell 100 without the wall portion 101 according to one or more embodiments of the present application. Figure 7 is Figure 6 a top view structural schematic view of the shell 100 without the wall portion 101.

[0062] The gas flow channel 120 includes a gas sub-flow channel 121, one end of which extends to the vicinity of the wall portion 101, and the other end of which extends to the side of the housing 100 away from the wall portion 101. The shape, size, etc. of the gas sub-flow channel 121 can be set according to actual conditions. For example, the gas sub-flow channel 121 can have a linear strip structure, or the gas sub-flow channel 121 can also have other curved shapes. For example, the gas sub-flow channel 121 can extend in the height direction of the battery monomer 10, that is, the direction in which the gas sub-flow channel 121 extends can be perpendicular to the surface of the wall portion 101 of the battery monomer 10. One end of the gas sub-flow channel 121 extends to the vicinity of the wall portion 101, and the other end extends to the side of the housing 100 away from the wall portion 101, and the gas sub-flow channel 121 can continuously extend from one end to the other end, so that at least part of the gas on the side of the housing 100 away from the wall portion 101 can be guided to the explosion-proof valve 300 through the gas sub-flow channel 121, and the gas can be further efficiently discharged from the accommodation space 110 through the explosion-proof valve 300.

[0063] Further, the number of gas sub-flow channels 121 is multiple, and the multiple gas sub-flow channels 121 are arranged at intervals. The number of gas sub-flow channels 121 can be set according to actual conditions. For example, the number of gas sub-flow channels 121 can be proportional to the capacity of the battery monomer 10. When the capacity of the battery monomer 10 is large, the number of gas sub-flow channels 121 can be more, and when the capacity of the battery monomer 10 is small, the number of gas sub-flow channels 121 can be less. The gas sub-flow channels 121 can be distributed on all or part of the inner side wall of the housing 100, so that the efficiency of guiding the gas to the explosion-proof valve 300 can be improved by simultaneously opening multiple gas sub-flow channels 121, and the gas can be further efficiently discharged from the accommodation space 110 through the explosion-proof valve 300.

[0064] Specifically referring to Figure 4 and Figure 5 , the inner side wall of the housing 100 is provided with at least two protrusions 130, and the at least two protrusions 130 are arranged at intervals to form the gas sub-flow channel 121. The shape and size of the protrusion 130 can be limited according to actual conditions. The shape and size of the at least two protrusions 130 can be the same or different, and the at least two protrusions 130 can be arranged protruding relative to other inner side wall surfaces of the housing 100, so that the at least two protrusions 130 can form the gas sub-flow channel 121 when arranged at intervals. The electrode assembly 200 is located in the accommodation space 110, and the outer side wall of the electrode assembly 200 can be in contact with the protrusion 130, so that the electrode assembly 200 and the gas sub-flow channel 121 form an avoidance, and the gas in the accommodation space 110 can flow in the gas sub-flow channel 121.

[0065] Specifically referring to Figure 6 and Figure 7The inner side wall of the shell 100 is recessed to form the gas sub-flow channel 121. The shape and size of the recessed portion can be defined according to actual conditions, for example, the shape of the recessed portion can be semi-cylindrical, etc. The number of recessed portions can be set according to actual conditions. When the number of recessed portions is multiple, the recessed portions are arranged at intervals. The other positions of the inner side wall of the shell 100 corresponding to the recessed portions can be flat surfaces, which can be in contact with the outer side wall of the electrode assembly 200 and can limit the position of the electrode assembly 200, alleviate the abnormal shaking of the electrode assembly 200, and also make the electrode assembly 200 avoid the gas sub-flow channel 121, so as to facilitate the flow of the gas in the accommodation space 110 in the gas sub-flow channel 121.

[0066] The shell 100 can be formed by a stamping die. The shape of the stamping die can be set according to actual conditions. For example, the stamping die can include a main body portion, and the outer side surface of the main body portion is at least partially protruded. The shell 100 can be wrapped outside the stamping die, and the internal structure of the shell 100 is formed by stamping the stamping die. Specifically, the main body portion of the stamping die corresponds to the accommodation space 110 of the shell 100, and the protruded portion of the main body portion corresponds to the recessed portion of the inner side wall of the shell 100, thereby forming the gas flow channel 120. Alternatively, the stamping die can include a main body portion, and the outer side surface of the main body portion is at least partially recessed. The shell 100 can be wrapped outside the stamping die, and the internal structure of the shell 100 is formed by stamping the stamping die. Specifically, the main body portion of the stamping die corresponds to the accommodation space 110 of the shell 100, and the recessed portion of the main body portion corresponds to the protruded portion of the inner side wall of the shell 100, thereby forming the gas flow channel 120.

[0067] In some embodiments, the width dimension D of each gas sub-flow channel 121 is between 3 mm and 15 mm. The width dimension D of each gas sub-flow channel 121 is between 5 mm and 15 mm, the width dimension D of each gas sub-flow channel 121 is between 7 mm and 15 mm, the width dimension D of each gas sub-flow channel 121 is between 10 mm and 15 mm, the width dimension D of each gas sub-flow channel 121 is between 5 mm and 10 mm, or the width dimension D of each gas sub-flow channel 121 is between 7 mm and 10 mm. Specifically, the width dimension D of each gas sub-flow channel 121 can be 3 mm, 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, or 15 mm. Exemplarily, when the inner side wall of the shell 100 is provided with at least two protrusions 130, the at least two protrusions 130 are arranged at intervals to form the gas sub-flow channel 121, the width dimension D of the gas sub-flow channel 121 at this time can be selected to be in a larger range, for example, the width dimension D of the gas sub-flow channel 121 at this time can be selected to be in a larger range between 10 mm and 15 mm, and the like. When the inner side wall of the shell 100 is recessed to form the gas sub-flow channel 121, the width dimension D of the gas sub-flow channel 121 at this time can be selected to be in a smaller range, for example, the width dimension D of the gas sub-flow channel 121 at this time can be selected to be in a larger range between 3 mm and 5 mm, and the like.

[0068] In some embodiments, the depth of the gas sub-flow channel 121 is 0.5 to 5 times the wall thickness of the shell 100. The depth of the gas sub-flow channel 121 can be understood as the extension depth of the gas sub-flow channel 121 along the wall thickness direction of a certain side wall of the shell 100. The wall thickness of the shell 100 can correspond to the position of the gas sub-flow channel 121, or correspond to the position where the gas sub-flow channel 121 is not arranged. The depth of the gas sub-flow channel 121 can be 0.5 to 3 times the wall thickness of the shell 100, can be 1 to 3 times the wall thickness of the shell 100, can be 1 to 5 times the wall thickness of the shell 100, can be 2 to 5 times the wall thickness of the shell 100, or can be 3 to 5 times the wall thickness of the shell 100. Specifically, the depth of the gas sub-flow channel 121 is 0.5 times, 1 times, 2 times, 3 times, 4 times, or 5 times the wall thickness of the shell 100, and the like. The depth of the gas sub-flow channel 121 can be related to the material of the shell 100, for example, when the material of the shell 100 is mainly aluminum, the depth of the gas sub-flow channel 121 can be 0.5 to 5 times the wall thickness of the shell 100. When the material of the shell 100 is mainly steel, the depth of the gas sub-flow channel 121 can be 0.5 to 3 times the wall thickness of the shell 100. In this way, the risk of stress concentration at the corresponding position of the gas sub-flow channel 121 due to the small width dimension D of the gas sub-flow channel 121 can be alleviated, and the risk of reducing the overall structural strength of the shell 100 due to the large width dimension D of the gas sub-flow channel 121 can be alleviated.

[0069] In some embodiments, the housing 100 has two first side walls 140 arranged oppositely and two second side walls 150 arranged oppositely, the surface area of the first side wall 140 is larger than that of the second side wall 150, and the gas flow channel 120 is arranged on at least one first side wall 140. For example, the square battery monomer 10 has six side walls in total, the wall 101 and the side wall opposite to the wall 101 can be the end wall and the bottom wall of the battery monomer 10, the four side walls are located between the end wall and the bottom wall, and the first side wall 140 is connected with the end wall, the bottom wall and the two second side walls 150. When the electrode assembly 200 is placed in the accommodation space 110, the two side walls with larger area of the electrode assembly 200 are attached to the two first side walls 140, the two side walls with smaller area of the electrode assembly 200 are attached to the two second side walls 150, the cross section of the electrode assembly 200 is generally in the shape of a racetrack, and the position of the accommodation space 110 where the first side wall 140 and the second side wall 150 are connected is generally not filled by the electrode assembly 200. The part not filled by the electrode assembly 200 can also be used for gas flow, so that the gas flow channel 120 is only arranged on the first side wall 140 with larger area, the structural strength of the housing 100 can be improved, the forming difficulty of the gas sub-flow channel 121 can be reduced, and the production efficiency can be improved.

[0070] Referring to Figure 8 and Figure 9 , Figure 8 is a first top view structural schematic diagram of the housing 100 without the wall 101 according to one or more embodiments of the present application. Figure 9 is a second top view structural schematic diagram of the housing 100 without the wall 101 according to one or more embodiments of the present application.

[0071] The outer side of the housing 100 away from the accommodation space 110 is provided with a positioning structure 160, and the positioning structure 160 is arranged correspondingly to the gas flow channel 120 in the thickness direction of the side wall of the housing 100. The positioning structure 160 can be in any form, and the positioning structure 160 is located on the outer side of the housing 100, which can facilitate the cooperation of the battery monomer 10 and the corresponding positioning structure 160 of the remaining battery monomers 10 to be fixed to each other. The positioning structure 160 is arranged correspondingly to the gas flow channel 120 in the thickness direction of the side wall of the housing 100, which can facilitate the synchronous forming of the positioning structure 160 and the gas flow channel 120, and improve the production efficiency.

[0072] Referring to Figure 8The positioning structure 160 comprises a protruding structure 161 corresponding to the gas flow channel 120 in the thickness direction of the sidewall of the shell 100. The inner sidewall of the shell 100 corresponding to the protruding structure 161 can be recessed to form a gas sub-flow channel 121 of the gas flow channel 120. The shape and size of the recessed portion can be defined according to actual conditions, for example, the shape of the recessed portion can be semicylindrical, etc. The number of recessed portions can be set according to actual conditions, and when the number of recessed portions is multiple, the recessed portions are arranged at intervals. The inner sidewall of the shell 100 corresponding to other positions of the recessed portion can be a flat surface, which can be in contact with the outer sidewall of the electrode assembly 200 and can limit the position of the electrode assembly 200, alleviate the abnormal shaking of the electrode assembly 200, and also make the electrode assembly 200 avoid the gas sub-flow channel 121, so as to facilitate the flow of gas in the accommodation space 110 in the gas sub-flow channel 121. The shape and size of the protruding structure 161 can be defined according to actual conditions, and one protruding structure 161 can correspond to one gas sub-flow channel 121 of the recessed portion, and the forming method is simpler. For example, the shell 100 is formed by two stamping molds, the inner stamping mold can comprise a main body portion, and the outer surface of the main body portion is at least partially protruding, the shell 100 can be wrapped outside the stamping mold, the inner structure of the shell 100 is formed by the inner stamping mold, and the outer structure of the shell 100 is formed by the outer stamping mold. Specifically, the main body portion of the inner stamping mold corresponds to the accommodation space 110 of the shell 100, the protruding portion of the main body portion corresponds to the recessed portion of the inner sidewall of the shell 100, thereby forming the gas flow channel 120, wherein the protruding height of the main body portion is large, and the protruding structure 161 is formed by cooperating with the outer stamping mold.

[0073] For example, Figure 9The inner side wall of the shell 100 is provided with at least two protrusions 130, the at least two protrusions 130 are arranged at intervals to form a gas flow channel 120, and / or the outer side of the shell 100 away from the accommodation space 110 is provided with a groove structure 162, the groove structure 162 and the protrusions 130 are arranged correspondingly in the thickness direction of the side wall of the shell 100. The shape and size of the protrusions 130 can be limited according to actual conditions, the shape and size of the at least two protrusions 130 can be the same or different, and the at least two protrusions 130 can be arranged protruding relative to other inner side wall surfaces of the shell 100, so that the at least two protrusions 130 can form the gas flow channel 120 when arranged at intervals. The electrode assembly 200 is located in the accommodation space 110, and the outer side wall of the electrode assembly 200 can be in contact with the protrusions 130, so that the electrode assembly 200 is avoided from the gas flow channel 120, and the gas in the accommodation space 110 can flow in the gas flow channel 120. The shape and size of the groove structure 162 can be limited according to actual conditions, one groove structure 162 can correspond to one protrusion 130, and the forming method is simpler. For example, the shell 100 is formed by two stamping molds, the inner stamping mold can include a main body portion, and the outer side surface of the main body portion is at least partially recessed. The shell 100 can be wrapped outside the stamping mold, the inner structure of the shell 100 is formed by the inner stamping mold, and the outer structure of the shell 100 is formed by the outer stamping mold. Specifically, the main body portion of the inner stamping mold corresponds to the accommodation space 110 of the shell 100, and the recess of the main body portion corresponds to the protrusions 130 of the inner side wall of the shell 100, thereby forming the gas flow channel 120. The greater the protruding height of the protrusions 130, the greater the depth of the groove structure 162 formed by the outer stamping mold.

[0074] In other embodiments, at least two protrusions 130 can be arranged on the inner side wall of the shell 100, the at least two protrusions 130 are arranged at intervals to form a gas flow channel 120, and then a protruding structure 161 is arranged on the outer side of the shell 100 away from the accommodation space 110, the protruding structure 161 and the protrusions 130 are arranged correspondingly in the thickness direction of the side wall of the shell 100. Or the inner side wall of the shell 100 can be recessed to form a gas flow channel 120, and at the same time, a groove structure 162 is arranged on the outer side of the shell 100 away from the accommodation space 110, the groove structure 162 and the gas flow channel 120 are arranged correspondingly in the thickness direction of the side wall of the shell 100.

[0075] Referring to Figure 10 , Figure 10 is a side view of a first structure of a battery cell 10 according to one or more embodiments of the present application.

[0076] The battery cell 10 includes a positive electrode post 400 and a negative electrode post 500, which are arranged at intervals on the wall portion 101, and the explosion-proof valve 300 is located between the positive electrode post 400 and the negative electrode post 500. The wall portion 101 can be an end cover of the battery cell 10, and the positive electrode post 400, the negative electrode post 500, and the explosion-proof valve 300 are arranged on the end cover. The positive electrode post 400 and the negative electrode post 500 can be used to be electrically connected to an external device together, so that the battery cell 10 can be charged and discharged by the external device. The explosion-proof valve 300 is located between the positive electrode post 400 and the negative electrode post 500, and the risk of interference between the positive electrode post 400 and the negative electrode post 500 when conducting electricity with the external device can be improved by increasing the distance between the positive electrode post 400 and the negative electrode post 500. In this embodiment, the number of gas sub-flow channels 121 can be multiple, and one end of each gas sub-flow channel 121 is located on the side of the shell 100 away from the wall portion 101 and extends toward the side of the wall portion 101 in the height direction of the battery cell 10, so that the other end of the gas sub-flow channel 121 is arranged close to the wall portion 101.

[0077] Referring to Figure 11 , Figure 11 is a side view of a second structure of a battery cell 10 according to one or more embodiments of the present application.

[0078] The battery cell 10 includes a positive electrode post 400 and a negative electrode post 500, which are arranged at intervals on the wall portion 101, and the explosion-proof valve 300 is located between the positive electrode post 400 and the negative electrode post 500. The wall portion 101 can be an end cover of the battery cell 10, and the positive electrode post 400, the negative electrode post 500, and the explosion-proof valve 300 are arranged on the end cover. The positive electrode post 400 and the negative electrode post 500 can be used to be electrically connected to an external device together, so that the battery cell 10 can be charged and discharged by the external device. The explosion-proof valve 300 is located between the positive electrode post 400 and the negative electrode post 500, and the risk of interference between the positive electrode post 400 and the negative electrode post 500 when conducting electricity with the external device can be improved by increasing the distance between the positive electrode post 400 and the negative electrode post 500. In this embodiment, the number of gas sub-flow channels 121 can be multiple, and one end of each gas sub-flow channel 121 is located on the side of the shell 100 away from the wall portion 101 and extends toward the side of the wall portion 101 in the height direction of the battery cell 10, so that the other end of the gas sub-flow channel 121 is arranged close to the wall portion 101.

[0079] Referring to Figure 12 , Figure 12 is a side view of a third structure of a battery cell 10 according to one or more embodiments of the present application.

[0080] The battery cell 10 includes a positive electrode post 400 and a negative electrode post 500, one of which is disposed on the wall portion 101 and the other of which is disposed on the side of the housing 100 away from the wall portion 101. In the present embodiment, the battery cell 10 can be a prismatic battery, and the wall portion 101 can be an end wall of the housing 100 in the length direction of the battery cell 10. The positive electrode post 400 and the negative electrode post 500 can be located on both end walls of the housing 100 in the length direction of the battery cell 10. Exemplarily, the positive electrode post 400 and the explosion-proof valve 300 can be located on the wall portion 101 of the housing 100, and the negative electrode post 500 is located on the other end wall of the housing 100 in the length direction of the battery cell 10. Alternatively, the negative electrode post 500 and the explosion-proof valve 300 can be located on the wall portion 101 of the housing 100, and the negative electrode post 500 is located on the other end wall of the housing 100 in the length direction of the battery cell 10. The positive electrode post 400 and the negative electrode post 500 can be used to collectively electrically connect with an external device, so that the battery cell 10 can be charged and discharged by the external device. The positive electrode post 400, the negative electrode post 500, and the explosion-proof valve 300 are located on different side walls of the housing 100, which can improve the influence of the explosion-proof valve 300 on the positive electrode post 400 and the negative electrode post 500. In the present embodiment, the number of the gas sub-flow channels 121 can be multiple, and one end of each gas sub-flow channel 121 is located on the side of the housing 100 away from the wall portion 101 and extends toward the side of the wall portion 101 in the length direction of the battery cell 10, so that the other end of the gas sub-flow channel 121 is disposed close to the wall portion 101.

[0081] In summary, the housing 100 is provided with the gas flow channel 120 and the accommodation space 110 that are in communication with each other, and at least one end of the gas flow channel 120 extends to close to the wall portion 101, so that the electrode assembly 200 in the accommodation space 110 can be efficiently guided to the explosion-proof valve 300 on the wall portion 101 through the gas flow channel 120 after a large amount of gas is generated during the charging and discharging of the battery cell 10, and then the gas is efficiently discharged from the accommodation space 110 through the explosion-proof valve 300, thereby improving the risk of damage to the use performance of the battery cell 10 due to the accumulation of a large amount of gas in the housing.

[0082] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing formed with a receiving space, the housing comprising a wall portion; an electrode assembly located in the receiving space; an explosion-proof valve arranged on the wall portion; wherein the housing is provided with a gas flow channel, at least one end of the gas flow channel extending to a position close to the wall portion.

2. The battery cell of claim 1, wherein, The gas flow channel comprises a plurality of gas sub-flow channels, one end of each gas sub-flow channel extending to a position close to the wall portion and the other end extending to a side of the housing away from the wall portion.

3. The battery cell of claim 2, wherein, The gas sub-flow channels are arranged in a spaced manner.

4. The battery cell of claim 2, wherein, The inner side wall of the housing is recessed to form the gas sub-flow channels.

5. The battery cell of claim 2, wherein, The inner side wall of the housing is provided with at least two protrusions, the at least two protrusions being arranged in a spaced manner to form the gas sub-flow channels.

6. The battery cell of claim 2, wherein, The width of each gas sub-flow channel is between 3mm and 15mm.

7. The battery cell of claim 2, wherein, The depth of the gas sub-flow channels is 0.5 to 5 times the thickness of the wall of the housing.

8. The battery cell of claim 1, wherein, The housing has two first side walls arranged in a facing manner and two second side walls arranged in a facing manner, the surface area of the first side walls being greater than that of the second side walls, and the gas flow channel is arranged on at least one of the first side walls.

9. The battery cell of claim 1, wherein, The outer side of the housing away from the receiving space is provided with a protruding structure, the protruding structure being arranged in a corresponding manner with the gas flow channel in the thickness direction of the side wall of the housing.

10. The battery cell of claim 1, wherein, The inner side wall of the housing is provided with at least two protrusions arranged in a spaced manner to form the gas flow channel, and / or the outer side of the housing away from the receiving space is provided with a recess structure, the recess structure and the protrusions being arranged in a corresponding manner in the thickness direction of the side wall of the housing.

11. The battery cell according to any one of claims 1 to 10, characterized in that The battery cell comprises a positive electrode post and a negative electrode post, the positive electrode post and the negative electrode post being arranged in a spaced manner on the housing outside the wall portion.

12. A battery device characterized by comprising: The battery device comprises the battery cell according to any one of claims 1 to 11.

13. An electrical device, comprising: The electric device comprises the battery device according to claim 12.

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