Battery cell, battery, and electric device

Abstract

The application discloses a battery monomer, a battery and an electric equipment. The battery monomer comprises a shell, the shell defines a containing cavity, and the bottom of the shell is provided with an explosion-proof valve; a bottom support is arranged on the bottom wall of the containing cavity, and the bottom support comprises a support plate, one side surface of the support plate facing the bottom wall of the containing cavity is a first surface; the support plate comprises at least one first support rib, the first support rib is arranged on the first surface and extends along the length direction of the support plate, and the at least one first support rib is arranged on the first surface and is arranged on at least one side edge of the support plate in the width direction respectively, and the first support rib, the first surface and the bottom wall of the containing cavity define an airflow channel communicated with the explosion-proof valve. According to the battery monomer, a larger discharge space is formed in the battery monomer, so that the exhaust effect can be improved, the probability of thermal runaway of the battery monomer and the risk of cracking of the shell weld caused by excessive pressure can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] The relevant technology points out that ultra-thin separators are currently used in the production of battery cells. The use of ultra-thin separators reduces the volume of electrode components, reduces the group margin, and increases the energy density, thus creating room to increase the capacity of electrode components. However, as the capacity of electrode components increases, the gas production of battery cells also increases, and the probability of thermal runaway of battery cells and the risk of cracking of the casing welds due to excessive pressure also increase.

[0003] Currently, to prevent released gases and particulate matter from entering the passenger compartment, explosion-proof valves are placed at the bottom of the battery cells. However, this approach is prone to problems with poor venting, making it difficult for gases to flow to the explosion-proof valves for timely discharge, which further increases the probability of thermal runaway of the battery cells. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell that allows for a large internal exhaust space, enabling the large amount of gas generated during battery cell circulation to be guided through an airflow channel to an explosion-proof valve and discharged. This improves the exhaust effect, effectively reduces the internal pressure of the battery cell, lowers the probability of thermal runaway, and reduces the risk of weld cracking in the casing due to excessive pressure.

[0005] The present invention also proposes a battery having the above-mentioned battery cells.

[0006] The present invention also proposes an electrical device having the above-mentioned battery.

[0007] According to a first aspect of the present invention, a battery cell includes: a housing defining a receiving cavity, the bottom of the housing having an explosion-proof valve; a bottom support disposed on the bottom wall of the receiving cavity, the bottom support including: a support plate, the side surface of the support plate facing the bottom wall of the receiving cavity being a first surface; a support frame including at least one first support rib, the first support rib being disposed on the first surface and extending along the length direction of the support plate, the at least one first support rib being disposed on the first surface and respectively arranged on at least one side edge of the support plate in the width direction, the first support rib, the first surface and the bottom wall of the receiving cavity defining an airflow channel communicating with the explosion-proof valve; and an electrode assembly disposed within the receiving cavity and supported on a second surface of the support plate, the first surface and the second surface being arranged opposite to each other in the thickness direction of the support plate.

[0008] According to the present invention, by setting a bottom support and the bottom wall of the receiving cavity to form an airflow channel, a large exhaust space can be formed inside the battery cell. This allows a large amount of gas generated by the battery cell during the cycle to be guided to the explosion-proof valve through the airflow channel and discharged through the explosion-proof valve. This improves the exhaust effect of the battery cell, effectively reduces the internal pressure of the battery cell, reduces the probability of thermal runaway of the battery cell, and reduces the risk of cracking of the shell weld caused by excessive pressure.

[0009] In some embodiments, there are two first support ribs, which are respectively arranged on both sides of the support plate in the width direction, and at least a portion of each of the two first support ribs is flush with both sides of the support plate in the width direction.

[0010] This embodiment, by setting two first support ribs, with at least a portion of each first support rib flush with the two side edges of the support plate in the width direction, can effectively reduce the probability of flow stagnation zones forming at the edges of the first support ribs and the support plate. This effectively reduces the bulging phenomenon caused by airflow accumulation at the connection between the first support ribs and the support plate, allowing a large amount of gas to enter the airflow channel from both ends, thereby improving the exhaust effect. At the same time, it can also increase the cross-sectional area of ​​the airflow channel, thereby further increasing the exhaust space of the bottom support and improving the exhaust effect.

[0011] In some embodiments, the first support rib extends from one end of the support plate along its length to the other end, and the width of the first support rib gradually increases in the width direction of the support plate in the direction from both ends of the support plate toward the middle.

[0012] In this embodiment, by setting the width of the first support rib to gradually increase from both ends toward the middle in the length direction of the support plate, the structural strength of the middle part of the support plate can be increased, thereby effectively increasing the support effect of the bottom bracket. This can effectively reduce the risk of the bottom bracket being crushed and ensure the smoothness of venting. At the same time, it can also increase the flow speed of air in the airflow channel, thereby increasing the venting effect. This can reduce the probability of thermal runaway of battery cells and the risk of cracking of the shell weld caused by excessive pressure.

[0013] In some embodiments, in a direction from one end of the support plate toward the other end along its length, the side edge of the first support rib facing the airflow channel extends along an arc protruding toward the airflow channel.

[0014] This embodiment reduces the generation of eddies and the occurrence of boundary layer detachment by setting the edge of the first support rib to extend along the arc protruding towards the airflow channel. This can increase the airflow velocity and allow the airflow entering the airflow channel to be quickly guided to the explosion-proof valve position. This can quickly reduce the internal pressure of the battery cell, reduce the probability of thermal runaway of the battery cell, and reduce the risk of cracking of the shell weld caused by excessive pressure.

[0015] In some embodiments, one side edge of the first support rib extends along an arc, and the diameter of the arc is 130mm-180mm.

[0016] In this embodiment, by setting the diameter of the arc line to 130mm-180mm, the curvature of the first support rib is not too large, which is conducive to the smooth flow of air, reduces the resistance during the flow process, and increases the exhaust effect of the airflow. It can also prevent the curvature of the first support rib from being too small, which helps to reduce the generation of eddies in the flow boundary layer, thereby increasing the flow velocity and thus improving the exhaust effect.

[0017] In some embodiments, in the width direction of the support plate, the width of the first support rib at both ends in the length direction of the support plate is 8mm-11mm.

[0018] In this embodiment, by setting the width of the first support rib at both ends of the support plate to 8mm-11mm, the structural strength and support performance of the first support rib can meet the support performance required by the bottom support, which can reduce the risk of the bottom support being crushed; at the same time, it can also ensure the flow area of ​​the airflow channel, thereby ensuring the exhaust space and increasing the exhaust effect.

[0019] In some embodiments, the maximum width of the first support rib in the width direction of the support plate is 12mm-16mm.

[0020] In this embodiment, by setting the maximum width of the first support rib to 12mm-16mm, the structural strength of the base bracket can be increased, the probability of deformation of the base bracket and the risk of being crushed can be reduced, thereby reducing the probability of thermal runaway of battery cells caused by obstructed exhaust paths.

[0021] In some embodiments, the support frame further includes two second support ribs, which extend along the length of the support plate and are disposed between the two first support ribs, and the two second support ribs are respectively arranged at both ends of the support plate in the length direction.

[0022] This embodiment increases the number of support points of the support frame to the support plate by setting a second support rib, thereby further increasing the structural strength and support strength of the support frame, further reducing the risk of the bottom support being crushed, and thus reducing the probability of thermal runaway of battery cells caused by obstructed exhaust path.

[0023] In some embodiments, in the length direction of the support plate, one end of the second support rib is flush with the end edge of the support plate in the length direction.

[0024] In this embodiment, by setting one end of the second support rib flush with the end edge of the support plate along its length, the structural strength at both ends of the bottom support along its length can be increased. This effectively prevents the airflow inlet from being crushed, allowing the airflow to smoothly enter the airflow channel and be guided along the airflow channel to the explosion-proof valve, thereby venting the gas to the outside of the battery cell and reducing the occurrence of thermal runaway of the battery cell. At the same time, it can also effectively prevent the formation of a flow stagnation zone between the second support rib and the support plate, ensuring the smoothness of the airflow and thus improving the exhaust effect.

[0025] In some embodiments, the length of the second support rib is 20mm-30mm in the longitudinal direction of the support plate.

[0026] In this embodiment, by setting the length of the second support rib to 20mm-30mm, the length of the second support rib is not too large, which helps to increase the flow area of ​​the airflow channel, improve the airflow space, and enhance the exhaust effect of the bottom bracket. It also ensures that the length of the second support rib is not too small, so that the support strength of the support frame can meet the structural strength required by the bottom bracket, thereby reducing the risk of the bottom bracket being crushed and improving the reliability and service life of the battery cells.

[0027] In some embodiments, the ratio of the length of the second support rib to the length of the support plate in the longitudinal direction of the support plate is 0.07-0.12.

[0028] This embodiment, by setting the ratio of the length of the second support rib to the length of the support plate to 0.07-0.12, can effectively increase the flow area of ​​the airflow channel, thereby increasing the exhaust space and making the exhaust path smoother. This accelerates gas discharge, reduces the internal pressure of the battery cell, and improves the reliability and service life of the battery cell. At the same time, it also ensures that the second support rib meets the required support strength of the base bracket, effectively reducing the risk of the base bracket being crushed. This reduces the probability of exhaust failure of the base bracket, improves the exhaust effect, and thus reduces the probability of thermal runaway of the battery cell, improving the reliability and service life of the battery cell.

[0029] In some embodiments, the end face of the other end of the second support rib is an arc surface that convexes toward the end edge away from the support plate.

[0030] In this embodiment, by setting the end face of the other end of the second support rib to be an arc surface that bulges out in the direction away from the end edge of the support plate, the probability of eddy current generation can be effectively reduced, thereby increasing the airflow velocity. This allows the gas generated inside the battery cell to flow quickly to the explosion-proof valve and be discharged to the outside of the battery cell, thereby effectively reducing the occurrence of thermal runaway of the battery cell.

[0031] In some embodiments, the airflow channel includes guide sections and a confluence zone. There are two guide sections, which are respectively connected to both sides of the confluence zone in the length direction of the support plate. At least one sidewall of the guide section in the width direction of the support plate is formed with a guide slope. In the direction from the guide section toward the confluence zone, the guide slopes of the two guide sections extend obliquely toward both sides of the confluence zone in the width direction of the support plate.

[0032] This embodiment, by setting a guide section, can guide the smooth flow of gas, making the overall flow more orderly and helping to achieve directional gas flow, thereby increasing the smoothness of exhaust. At the same time, by setting a confluence area, the airflow entering from both ends can be gathered at the explosion-proof valve, which can increase the gas content at the explosion-proof valve location, thereby increasing the gas discharge speed and improving the exhaust effect.

[0033] In some embodiments, the two first support ribs are arranged rotationally symmetrically about the center of the support plate within the first surface.

[0034] This embodiment sets two first support ribs arranged symmetrically about the center of the support plate on the first surface. This allows the two first support ribs to be manufactured using a single mold or process, thereby reducing mold opening costs or manufacturing costs, and thus reducing the production difficulty and cost of the base bracket.

[0035] In some embodiments, the first support rib includes: a first support segment and a second support segment sequentially connected in the length direction of the support plate, at least a portion of the side surface of the first support segment facing the airflow channel is formed as the guide slope, and the guide slope extends obliquely toward another first support rib in the direction from the first support segment toward the second support segment.

[0036] This embodiment sets up a first support section and a second support section, and forms a guide slope on the side surface of the first support section facing the airflow channel. This allows the airflow to form a vortex in the confluence area, thereby accelerating the discharge of gas and effectively reducing the internal pressure of the battery cell and reducing the probability of thermal runaway of the battery cell.

[0037] In some embodiments, the guide ramp and the end face of the first support rib are rounded.

[0038] This embodiment effectively reduces the generation of eddies at the inlet of the airflow channel by setting a rounded corner between the guide slope and the end face of the first support rib, thereby improving the airflow velocity and the smoothness of airflow. This allows the gas generated inside the battery cell to flow quickly to the explosion-proof valve and be discharged to the outside of the battery cell, thereby effectively reducing the occurrence of thermal runaway of the battery cell.

[0039] In some embodiments, the fillet radius between the guide ramp and the end face of the first support rib is 2.5mm-5mm.

[0040] In this embodiment, by setting the fillet radius between the guide slope and the end face of the first support rib to 2.5mm-5mm, the fillet radius between the guide slope and the end face of the first support rib is not too large, which is beneficial to the production of the fillet and reduces the impact on the guide slope. At the same time, it also ensures that the fillet radius between the guide slope and the end face of the first support rib is not too small, which is beneficial to the reduction of eddies, thereby improving the airflow velocity and the smoothness of airflow, and improving the exhaust effect.

[0041] In some embodiments, the side surface of the first support segment facing the airflow channel further includes a flow-guiding slope, the flow-guiding slope being connected to one end of the guide slope facing the second support segment, and the flow-guiding slope extending obliquely toward the other side surface of the first support rib opposite to the airflow channel in the direction from the first support segment toward the second support segment, and the confluence area being formed between the flow-guiding slopes of the two first support ribs.

[0042] This embodiment, by setting a flow-guiding slope, can change the original flow trajectory of the airflow, so that the two airflows entering the confluence zone move in opposite directions and do not collide directly, thereby further promoting the generation of vortices and accelerating exhaust.

[0043] In some embodiments, the angle between the drainage slope and the length direction of the support plate is greater than the angle between the guide slope and the length direction of the support plate.

[0044] In this embodiment, by setting the angle between the diversion slope and the length direction of the support plate to be greater than the angle between the guide slope and the length direction of the support plate, the range of the confluence area can be limited to the range of the guide section, thereby limiting the range of the confluence area to the position of the explosion-proof valve, which can increase the exhaust effect.

[0045] In some embodiments, the drainage slope is connected to the guide slope by an arc.

[0046] This embodiment reduces the generation of vortices at the connection between the flow-guiding slope and the guide slope by setting an arc connection, thereby increasing the airflow speed and further accelerating the generation of vortices. This allows the airflow to be quickly discharged from the battery cell, reducing the internal pressure of the battery cell and reducing the occurrence of thermal runaway.

[0047] In some embodiments, the side surface of the second support segment facing the airflow channel is a plane parallel to the length direction of the support plate.

[0048] In this embodiment, by setting the surface of the second support section facing the airflow channel to be a plane parallel to the length direction of the support plate, the production convenience and production rate of the support frame can be improved. At the same time, it is also easier to control the size of the airflow channel and ensure the exhaust effect.

[0049] In some embodiments, in the width direction of the support plate, the ratio of the width of the second support segment to the maximum width of the first support segment is 0.25-0.45.

[0050] In this embodiment, by setting the ratio of the width of the second support section to the maximum width of the first support section to 0.25-0.45, the width of the second support section is not too large, thus ensuring the width of the airflow channel to meet the exhaust requirements of the battery cells. At the same time, it also ensures that the width of the second support section is not too small, which is beneficial to improving the support effect on the support plate, thereby increasing the support strength of the bottom bracket and effectively reducing the risk of the bottom bracket being crushed.

[0051] In some embodiments, the ratio of the projected area of ​​the support frame on the first surface to the area of ​​the first surface is 0.15-0.4.

[0052] This embodiment sets the ratio of the projected area of ​​the support frame on the first surface to the area of ​​the first surface to be 0.15-0.4, which helps to improve the structural strength and stability of the bottom support and effectively prevent the bottom support from being crushed. At the same time, it can also limit the flow area of ​​the airflow channel, so that the flow area of ​​the airflow channel can meet the exhaust requirements, allowing the gas in the battery cell during the cycle to be discharged in time, reducing the internal pressure of the battery cell, thereby reducing the probability of thermal runaway of the battery cell and improving the reliability and service life of the battery cell.

[0053] In some embodiments, the height of the support frame is 0.6mm-5mm in the thickness direction of the support plate.

[0054] In this embodiment, by setting the support frame height to 0.6mm-5mm along the thickness direction of the support plate, the bottom bracket can ensure smooth venting of the battery cells while reducing the space occupied by the bottom bracket and improving the energy density of the battery cells.

[0055] In some embodiments, the height of the support frame is 0.6mm-3mm in the thickness direction of the support plate.

[0056] In this embodiment, by setting the height of the support frame to 0.6mm-3mm in the thickness direction of the support plate, the height of the support frame is not too high, which is beneficial to improving the energy density of the battery cell. At the same time, the height of the support frame is not too low, so that the height of the support frame can meet the exhaust requirements, thereby improving the exhaust effect.

[0057] In some embodiments, the battery cell is a lithium iron phosphate battery, and the height of the support frame is 0.6mm-1mm; or, the battery cell is a ternary polymer lithium battery, and the height of the support frame is 0.6mm-3mm.

[0058] In this embodiment, when the battery cell is a lithium iron phosphate battery, the height of the support frame is set to 0.6mm-1mm, and when the battery cell is a ternary polymer lithium battery, the height of the support frame is set to 0.6mm-3mm. This allows the height of the support frame to be designed according to the type of battery cell, thereby enabling the base bracket to meet the venting requirements while reducing the space occupied by the base bracket and increasing the energy density of the battery cell.

[0059] In some embodiments, the thickness of the support plate is 0.4mm-0.6mm.

[0060] In this embodiment, by setting the thickness of the support plate to 0.4mm-0.6mm, the support plate can fulfill the function of supporting the electrode assembly of the bottom bracket while reducing the material used in the support plate, thereby reducing the production difficulty and cost of the support plate. At the same time, setting the thickness range of the support plate in the range of [0.4mm, 0.6mm] can also reduce the thickness of the bottom bracket, thereby increasing the energy density of the battery cell.

[0061] In some embodiments, the base support is a polypropylene component, or the base support is an aluminum component.

[0062] This embodiment uses a polypropylene base bracket, which reduces the likelihood of the base bracket being corroded by the electrolyte or damaged by pressure, thereby improving the reliability and service life of the base bracket. It also reduces the production cost of the battery cell. Using an aluminum base bracket increases the support and corrosion resistance of the base bracket while reducing its weight, which in turn reduces the weight of the battery cell, thus achieving battery lightweighting.

[0063] The battery according to the second aspect of the present invention includes a battery cell according to the first aspect of the present invention.

[0064] According to the battery of the present invention, by providing the battery cells described in the first aspect, the overall performance of the battery is improved.

[0065] The electrical appliance according to the third aspect of the invention includes a battery according to the second aspect of the invention.

[0066] According to the present invention, by providing the battery described in the second aspect, the overall performance of the electrical device is improved.

[0067] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0068] Figure 1 This is a schematic diagram of a vehicle according to an embodiment of the present invention;

[0069] Figure 2 This is a schematic diagram of a battery according to an embodiment of the present invention;

[0070] Figure 3 This is an exploded view of a battery according to an embodiment of the present invention;

[0071] Figure 4 This is an exploded view of a battery cell according to an embodiment of the present invention;

[0072] Figure 5 This is a schematic diagram of a base support according to an embodiment of the present invention;

[0073] Figure 6 yes Figure 5 A schematic diagram from another angle shown;

[0074] Figure 7 yes Figure 5 A schematic diagram of the base support at another angle shown;

[0075] Figure 8 yes Figure 5 A schematic diagram of the base support at another angle shown;

[0076] Figure 9 This is a schematic diagram of a base support according to another embodiment of the present invention;

[0077] Figure 10 yes Figure 9 A schematic diagram of the base support from another angle;

[0078] Figure 11 yes Figure 9 A schematic diagram of the base support at another angle shown;

[0079] Figure 12 yes Figure 9 A schematic diagram of another angle of the base support shown.

[0080] Figure label:

[0081] 1. Vehicles;

[0082] 1000, battery;

[0083] 100. Battery cell;

[0084] 10. Base support; 11. Support plate; 12. Support frame; 121. First support rib; 1211. First support section; 1212. Second support section; 1213. Guide slope; 1214. Drainage slope; 122. Second support rib; 13. Airflow channel; 131. Guide section; 132. Convergence area;

[0085] 20. Shell; 21. Receiving cavity;

[0086] 30. Electrode assembly;

[0087] 40. End cap; 50. Adapter plate;

[0088] 200. Container body; 201. Main container; 202. Cover plate;

[0089] 2000, controller; 3000, motor. Detailed Implementation

[0090] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0091] 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 this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0092] In the description of the embodiments of this invention, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this invention, "multiple" means two or more, unless otherwise explicitly defined.

[0093] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0094] In the description of the embodiments of this invention, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0095] In the description of embodiments of the present invention, the term "multiple" refers to two or more (including two).

[0096] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0097] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0098] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0099] Currently, ultra-thin separators are used in the production of battery cells. The use of ultra-thin separators reduces the size of the electrode assembly, decreases the group margin, and increases the energy density, thus creating room to increase the capacity of the electrode assembly. However, as the capacity of the electrode assembly increases, the gas production of the battery cell also increases, increasing the probability of thermal runaway and the risk of weld cracking in the casing due to excessive pressure. Furthermore, to prevent released gases and particulate matter from entering the passenger compartment, explosion-proof valves are currently located at the bottom of the battery cell. However, this approach is prone to problems with poor venting, making it difficult for gases to flow to the explosion-proof valves for timely discharge, further increasing the probability of thermal runaway in the battery cell.

[0100] To address the issue of thermal runaway and shell weld cracking caused by the inability of gas to escape smoothly during battery cell cycling due to the explosion-proof valve being located at the bottom of the battery cell, research has found that an exhaust channel can be added to the bottom of the battery cell to ensure sufficient space for gas exhaust, allowing gas to escape smoothly, thereby reducing the internal pressure of the battery cell and minimizing the occurrence of thermal runaway.

[0101] Based on the above considerations, in order to solve the problem of thermal runaway and shell weld cracking caused by the inability of gas to be smoothly discharged during the cycle of battery cells due to the explosion-proof valve being located at the bottom of the battery cell, a battery cell was designed. By setting a bottom support, multiple first support ribs of the bottom support are respectively arranged on at least one side edge of the support plate in the width direction. The first support ribs, the support plate, and the bottom wall of the receiving cavity together form an airflow channel. In this way, the gas exhaust space can be increased, the direction of gas can be guided, and the gas can be quickly discharged to the explosion-proof valve position of the battery cell. As a result, the gas generated by the battery cell can have a larger exhaust space, which can enable the airflow during the cycle of the battery cell to be discharged quickly, thereby rapidly reducing the internal pressure of the battery cell and reducing the probability of thermal runaway.

[0102] When a battery cell is used in a cycle, a large amount of gas is generated inside the battery cell. The gas can enter the airflow channel through both ends along the length of the first support rib, and then be discharged through the airflow channel to the explosion-proof valve. Therefore, the bottom bracket of this application can improve the exhaust situation inside the battery cell, reduce the internal pressure of the battery cell, and thus reduce the probability of thermal runaway of the battery cell and the risk of cracking of the shell weld caused by excessive pressure.

[0103] The battery cells disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0104] For ease of explanation, the following embodiments will be described using a vehicle 1 as an example of an electrical device according to an embodiment of the present invention.

[0105] Reference Figure 1 , Figure 1 This is a schematic diagram of a vehicle 1 provided in some embodiments of the present invention. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 1000 is installed inside vehicle 1, and the battery 1000 can be located at the bottom, front, or rear of vehicle 1. The battery 1000 can be used to power vehicle 1; for example, the battery 1000 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to supply power to the motor 3000, for example, to meet the power needs of vehicle starting, navigation, and driving.

[0106] In some embodiments of this application, the battery 1000 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0107] Reference Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of a battery 1000 according to some embodiments of the present invention. Figure 3 This is an exploded view of a battery 1000 according to some embodiments of the present invention. The battery 1000 includes a housing 200 and a battery cell 100. The housing 200 has a cavity, and the battery cell 100 is accommodated within the cavity of the housing 200. The housing 200 provides a accommodating space for the battery cell 100, and the housing 200 can adopt various structures. In some embodiments, the housing 200 may include a first part (e.g., a main housing 201 as described below) and a second part (e.g., a cover plate 202 as described below), the first part and the second part overlapping each other, and the first part and the second part together defining an accommodating space for accommodating the battery cell 100. The second part may be a hollow structure with one end open, and the first part may be a plate-like structure, with the first part covering the open side of the second part so that the first part and the second part together define the accommodating space; the first part and the second part may also both be hollow structures with one side open, with the open side of the first part covering the open side of the second part. Of course, the housing 200 formed by the first part and the second part can be of various shapes, such as a cylinder, a cuboid, etc.

[0108] In battery 1000, there can be multiple battery cells 100, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 100 is housed within housing 200. Alternatively, battery 1000 can also consist of multiple battery cells 100 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within housing 200. Battery 1000 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 100.

[0109] Each battery cell 100 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 100 can be cylindrical, flat, cuboid, or other shapes.

[0110] Reference Figure 4 , Figure 4This is a schematic diagram of a battery cell 100 provided in some embodiments of the present invention. The battery cell 100 refers to the smallest unit comprising a battery 1000. For example... Figure 4 As shown, the battery cell 100 includes an end cap 40, a housing 20, an electrode assembly 30, an adapter piece 50, a first insulating component, a base bracket 10, and other functional components.

[0111] End cap 40 refers to a component that covers the opening of housing 20 to isolate the internal environment of battery cell 100 from the external environment. The shape of end cap 40 can be adapted to the shape of housing 20 to fit it. Optionally, end cap 40 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 40 is not easily deformed under pressure and impact, giving battery cell 100 higher structural strength and improved safety performance. Functional components such as output terminals can be provided on end cap 40. Output terminals can be used for electrical connection with electrode assembly 30 to output or input electrical energy to battery cell 100. In some embodiments, end cap 40 can also be provided with an explosion-proof valve for releasing internal pressure when the internal pressure or temperature of battery cell 100 reaches a threshold. The material of end cap 40 can also be various, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, a first insulating member and an adapter piece 50 may be provided on the inner side of the end cap 40. The first insulating member can be used to isolate the electrical connection components inside the housing 20 from the end cap 40 to reduce the risk of short circuit; the adapter piece 50 is connected to the electrode tab for current transmission. Exemplarily, the first insulating member can be made of plastic, rubber, etc.

[0112] The housing 20 is a component used to cooperate with the end cap 40 to form the internal environment of the battery cell 100, wherein the formed internal environment can accommodate the electrode assembly 30 and other components. The housing 20 and the end cap 40 can be independent components. An opening can be provided on the housing 20, and the end cap 40 closes the opening to form the internal environment of the battery cell 100. Alternatively, the end cap 40 and the housing 20 can be integrated. Specifically, the end cap 40 and the housing 20 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 20, the end cap 40 closes the housing 20. The housing 20 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 20 can be determined according to the specific shape and size of the electrode assembly 30. The material of the housing 20 can be various, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0113] Electrode assembly 30 is the component in the battery cell 100 where electrochemical reactions occur. The casing 20 may contain one or more electrode assemblies 30. The electrode assembly 30 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 30, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery 1000, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0114] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the one with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0115] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0116] The membrane material can be PP (polypropylene) or PE (polyethylene), etc.

[0117] The following is for reference. Figures 4-11 A battery cell 100 according to an embodiment of the first aspect of the present invention is described. Figure 4 This is an exploded view of a battery cell 100 according to some embodiments of the present invention. Figure 5 This is a schematic diagram of the base support 10 according to some embodiments of the present invention. Figure 6 yes Figure 5 A schematic diagram of the base support 10 from another angle is shown. Figure 6 yes Figure 5 The diagram shows another angle of the base support 10. Figure 8 yes Figure 5 A schematic diagram of the base support 10 at another angle is shown. Figure 9 This is a schematic diagram of the base support 10 according to another embodiment of the present invention.Figure 10 yes Figure 9 A schematic diagram of the base support 10 from another angle, as shown. Figure 11 yes Figure 9 A schematic diagram of the base support 10 at another angle shown. Figure 12 yes Figure 9 A schematic diagram of the base support 10 at another angle shown.

[0118] This invention provides a battery cell 100, such as... Figures 4-5 As shown, the battery cell 100 includes: a housing 20, a bottom support 10, and an electrode assembly 30. The housing 20 defines a receiving cavity 21, and an explosion-proof valve is provided at the bottom of the housing 20. The bottom support 10 is disposed on the bottom wall of the receiving cavity 21 and includes: a support plate 11 and a support frame 12. The surface of the support plate 11 facing the bottom wall of the receiving cavity 21 is a first surface. The support frame 12 includes at least one first support rib 121, which is disposed on the first surface and along the length direction of the support plate 11 (e.g., along the length direction of the support plate 11). Figure 5 Extending in the direction shown from left to right, at least one first support rib 121 is provided on the first surface and respectively arranged on the support plate 11 in the width direction (e.g., from left to right). Figure 5 At least one side edge (as shown in the front-to-back direction), the first support rib 121, the first surface and the bottom wall of the receiving cavity 21 define an airflow channel 13 communicating with the explosion-proof valve; the electrode assembly 30 is disposed in the receiving cavity 21 and supported on the second surface of the support plate 11, the first surface and the second surface are arranged opposite to each other in the thickness direction of the support plate 11.

[0119] Specifically, the housing 20 is mainly used to isolate the inside and outside of the battery cell 100, effectively preventing communication between the inside and outside of the battery cell 100, thereby improving the reliability of the battery cell 100. The bottom support 10 and the bottom wall of the receiving cavity 21 together form an airflow channel 13, which can guide the gas in the receiving cavity 21 to the explosion-proof valve and discharge it through the explosion-proof valve. This can effectively reduce the pressure inside the battery cell 100, thereby reducing the probability of thermal runaway of the battery cell 100.

[0120] The support plate 11 can be a horizontally arranged rectangular plate. The second surface of the support plate 11 is connected to the electrode assembly 30, and the first surface of the support plate 11 abuts against the bottom wall of the receiving cavity 21 through the support frame 12. Thus, the support plate 11 and the electrode assembly 30 are in surface contact, which can increase the contact area between the bottom support 10 and the electrode assembly 30. This can effectively prevent damage to the electrode assembly 30 or the bottom support 10 caused by the expansion and compression of the bottom support 10 by the electrode assembly 30, thereby improving the reliability of the battery cell 100.

[0121] The first support rib 121 can be formed as a strip-shaped protrusion. One side of the first support rib 121 is connected to the support plate 11, and the other side extends toward the bottom wall of the receiving cavity 21 and abuts against the bottom wall of the receiving cavity 21. The first support rib 121 mainly plays a supporting role, which can form a certain gap between the support plate 11 and the bottom wall of the receiving cavity 21, thereby constraining the airflow channel 13 and realizing smooth exhaust.

[0122] The support frame 12 includes at least one first support rib 121. For example, the number of first support ribs 121 can be one, two, three, or more. At least one first support rib 121 is disposed on the first surface and is respectively arranged on at least one side edge of the support plate 11 in the width direction. That is, the first support rib 121 can be arranged on one side edge of the support plate 11 or on both sides edge of the support plate 11. In this way, the first support rib 121 can avoid the position of the explosion-proof valve, so that the airflow channel 13 is connected to the explosion-proof valve. This allows the gas generated inside the battery cell 100 to flow through the airflow channel 13 to the explosion-proof valve and be discharged through the explosion-proof valve. At the same time, the arrangement of the first support rib 121 on the edge of the support plate 11 can also increase the flow area of ​​the airflow channel 13, thereby increasing the exhaust space of the bottom bracket 10 and improving the exhaust effect. When the battery cell 100 is used in cycles, a large amount of gas is generated inside the battery cell 100. The gas can enter the airflow channel 13 through both ends of the first support rib 121 in the length direction, and then be discharged to the explosion-proof valve through the airflow channel 13. Therefore, the bottom bracket 10 of this application can improve the exhaust situation inside the battery cell 100, reduce the internal pressure of the battery cell 100, and thus reduce the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the casing 20 caused by excessive pressure.

[0123] According to the embodiments of the present invention, the battery cell 100, by setting the airflow channel 13 jointly defined by the bottom support 10 and the bottom wall of the receiving cavity 21, can form a large exhaust space inside the battery cell 100. This allows a large amount of gas generated by the battery cell 100 during the cycle to be guided to the explosion-proof valve through the airflow channel 13 and discharged through the explosion-proof valve. This can improve the exhaust effect of the battery cell 100, effectively reduce the internal pressure of the battery cell 100, reduce the probability of thermal runaway of the battery cell 100, and reduce the risk of cracking of the weld of the casing 20 due to excessive pressure.

[0124] According to some embodiments of the present invention, there are two first support ribs 121, which are respectively arranged on both sides of the support plate 11 in the width direction, and at least a portion of the two first support ribs 121 are flush with both sides of the support plate 11 in the width direction.

[0125] In other words, the two first support ribs 121 can be flush with the two sides of the support plate 11 in the width direction, or they can be flush with the two sides of the support plate 11 in the width direction.

[0126] In this embodiment of the invention, two first support ribs 121 are respectively arranged on both sides of the support plate 11 in the width direction, and at least a portion of the two first support ribs 121 are flush with both sides of the support plate 11 in the width direction. Therefore, the bottom support 10 in this embodiment of the invention can reduce the gap generated between the first support ribs 121 and the edge of the support plate 11, thereby further reducing the probability of forming a flow stagnation zone at the edge of the first support ribs 121 and the support plate 11, effectively reducing the bulging phenomenon caused by the accumulation of airflow at the connection between the first support ribs 121 and the support plate 11, and allowing a large amount of gas to enter the airflow channel 13 from both ends, thereby improving the exhaust effect; at the same time, it can also increase the cross-sectional area of ​​the airflow channel 13, thereby further increasing the exhaust space of the bottom support 10 and improving the exhaust effect.

[0127] This embodiment, by setting two first support ribs 121, with at least a portion of each first support rib 121 being flush with the two side edges of the support plate 11 in the width direction, can effectively reduce the probability of flow stagnation zones forming at the edges of the first support ribs 121 and the support plate 11. This effectively reduces the bulging phenomenon caused by airflow accumulation at the connection between the first support ribs 121 and the support plate 11, allowing a large amount of gas to enter the airflow channel 13 from both ends, thereby improving the exhaust effect. At the same time, it can also increase the cross-sectional area of ​​the airflow channel 13, thereby further increasing the exhaust space of the bottom support 10 and improving the exhaust effect.

[0128] According to some embodiments of the present invention, such as Figure 5 As shown, the first support rib 121 extends from one end of the support plate 11 along its length to the other end. In the direction from both ends of the support plate 11 toward the middle along its length, the width of the first support rib 121 gradually increases in the width direction of the support plate 11.

[0129] This can be understood as the width of the first support rib 121 increasing and then decreasing along the length of the support plate 11. This allows the width of the first support rib 121 at its middle position to be larger, thereby increasing the structural strength of the middle part of the support plate 11. This effectively increases the support effect of the bottom support 10, thereby effectively reducing the risk of the bottom support 10 being crushed and ensuring smooth airflow.

[0130] Meanwhile, an airflow channel 13 is formed between the two first support ribs 121. As a result, the cross-sectional area of ​​the airflow channel 13 gradually decreases in the direction from both sides toward the center along the length of the support plate 11. That is, the airflow channel 13 is narrowed. This can increase the flow velocity of the airflow in the airflow channel 13, thereby increasing the exhaust effect. This can reduce the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the casing 20 due to excessive pressure.

[0131] In this embodiment, by setting the width of the first support rib 121 to gradually increase from both ends toward the middle in the length direction of the support plate 11, the structural strength of the middle part of the support plate 11 can be increased, thereby effectively increasing the support effect of the bottom bracket 10. This can effectively reduce the risk of the bottom bracket 10 being crushed and ensure the smoothness of venting. At the same time, it can also increase the flow speed of air in the airflow channel 13, thereby increasing the venting effect. This can reduce the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the casing 20 due to excessive pressure.

[0132] According to some embodiments of the present invention, such as Figure 5 As shown, in the direction from one end of the support plate 11 to the other end along the length direction, the side edge of the first support rib 121 facing the airflow channel 13 extends along an arc protruding towards the airflow channel 13.

[0133] The first support rib 121 extends along an arc along one side of the airflow channel 13. The arc-shaped edge can guide the flow and reduce the generation of eddies at the surface of the first support rib 121, thereby reducing the occurrence of boundary layer detachment, increasing the airflow velocity, and enabling the airflow entering the airflow channel 13 to be quickly guided to the explosion-proof valve position. This can quickly reduce the internal pressure of the battery cell 100, reduce the probability of thermal runaway of the battery cell 100, and reduce the risk of cracking of the weld of the casing 20 due to excessive pressure.

[0134] In this embodiment, by setting the edge of the first support rib 121 to extend along the arc protruding towards the airflow channel 13, the generation of eddies can be reduced, the occurrence of boundary layer detachment can be reduced, and the airflow velocity can be increased. This allows the airflow entering the airflow channel 13 to be quickly guided to the explosion-proof valve position, thereby quickly reducing the internal pressure of the battery cell 100, reducing the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the casing 20 due to excessive pressure.

[0135] According to some embodiments of the present invention, such as Figure 5 As shown, one side edge of the first support rib 121 extends along an arc, and the diameter of the arc is 130mm-180mm.

[0136] The arc structure is simple and smooth, which is conducive to the production of the first support rib 121 and the airflow. Furthermore, the edge of the first support rib 121 extends along the arc, which can further improve the exhaust effect of the airflow.

[0137] For example, the diameter of the arc can be 130mm, 140mm, 150mm, 160mm, 170mm or 180mm.

[0138] Preferably, the diameter of the arc is 150mm.

[0139] In this embodiment, by setting the diameter of the arc to 130mm-180mm, the curvature of the first support rib 121 is not too large, which is conducive to the smooth flow of air, reduces the resistance during the flow process, and increases the exhaust effect of the airflow. It can also prevent the curvature of the first support rib 121 from being too small, which is conducive to reducing the generation of eddies in the flow boundary layer, thereby increasing the flow velocity and thus improving the exhaust effect.

[0140] According to some embodiments of the present invention, such as Figure 5 As shown, in the width direction of the support plate 11, the width of the first support rib 121 at both ends in the length direction of the support plate 11 is 8mm-11mm.

[0141] For example, in the width direction of the support plate 11, the width of the first support rib 121 at both ends in the length direction of the support plate 11 can be 8mm, 9mm, 10mm or 11mm.

[0142] In this embodiment, by setting the width of the first support rib 121 at both ends in the length direction of the support plate 11 to be 8mm-11mm, the structural strength and support performance of the first support rib 121 can meet the support performance required by the bottom support 10, which can reduce the risk of the bottom support 10 being crushed; at the same time, it can also ensure the flow area of ​​the airflow channel 13, thereby ensuring the exhaust space and increasing the exhaust effect.

[0143] According to some embodiments of the present invention, such as Figure 5 As shown, in the width direction of the support plate 11, the maximum width of the first support rib 121 is 12mm-16mm.

[0144] For example, in the width direction of the support plate 11, the maximum width of the first support rib 121 can be 12mm, 13mm, 14mm, 15mm or 16mm.

[0145] Preferably, the maximum width of the first support rib 121 in the width direction of the support plate 11 is 14 mm.

[0146] In this embodiment, by setting the maximum width of the first support rib 121 to 12mm-16mm, the structural strength of the bottom support 10 can be increased, the probability of deformation of the bottom support 10 and the risk of being crushed can be reduced, thereby reducing the probability of thermal runaway of the battery cell 100 due to obstructed exhaust path.

[0147] According to some embodiments of the present invention, such as Figure 5 As shown, the support frame 12 also includes two second support ribs 122. The second support ribs 122 extend along the length direction of the support plate 11 and are located between the two first support ribs 121. The two second support ribs 122 are respectively arranged at both ends of the support plate 11 in the length direction.

[0148] In this embodiment, by setting the second support rib 122, the support points of the support frame 12 on the support plate 11 can be increased, thereby further increasing the structural strength and support strength of the support frame 12, further reducing the risk of the bottom support 10 being crushed, and thus reducing the probability of thermal runaway of the battery cell 100 due to obstructed exhaust path.

[0149] According to some embodiments of the present invention, such as Figure 5 As shown, in the length direction of the support plate 11, one end of the second support rib 122 is flush with the end edge of the support plate 11 in the length direction.

[0150] In this embodiment, by setting one end of the second support rib 122 flush with the end edge of the support plate 11 along the length direction, the structural strength of both ends of the bottom bracket 10 along the length direction can be increased. This can effectively prevent the airflow inlet from being crushed, allowing the airflow to smoothly enter the airflow channel 13 and be guided along the airflow channel 13 to the explosion-proof valve, thereby venting the gas to the outside of the battery cell 100, thus reducing the occurrence of thermal runaway of the battery cell 100. At the same time, it can also effectively prevent the formation of a flow stagnation zone between the second support rib 122 and the support plate 11, ensuring the smoothness of the airflow and thus improving the exhaust effect.

[0151] According to some embodiments of the present invention, such as Figure 5 As shown, the length of the second support rib 122 in the longitudinal direction of the support plate 11 is 20mm-30mm.

[0152] For example, in the longitudinal direction of the support plate 11, the length of the second support rib 122 can be 20mm, 22mm, 24mm, 26mm, 28mm or 30mm.

[0153] In this embodiment, by setting the length of the second support rib 122 to 20mm-30mm, the length of the second support rib 122 is not too large, which helps to increase the flow area of ​​the airflow channel 13, improve the airflow space, and enhance the exhaust effect of the bottom bracket 10. It also ensures that the length of the second support rib 122 is not too small, so that the support strength of the support frame 12 can meet the structural strength required by the bottom bracket 10, thereby reducing the risk of the bottom bracket 10 being crushed and improving the reliability and service life of the battery cell 100.

[0154] According to some embodiments of the present invention, such as Figure 5 As shown, in the length direction of the support plate 11, the ratio of the length of the second support rib 122 to the length of the support plate 11 is 0.07-0.12.

[0155] For example, in the length direction of the support plate 11, the ratio of the length of the second support rib 122 to the length of the support plate 11 can be 0.07, 0.08, 0.09, 0.1, 0.11 or 0.12.

[0156] In this embodiment, by setting the ratio of the length of the second support rib 122 to the length of the support plate 11 to be 0.07-0.12, the flow area of ​​the airflow channel 13 can be effectively increased, thereby increasing the exhaust space and making the exhaust path smoother. This accelerates the gas discharge, reduces the internal pressure of the battery cell 100, and improves the reliability and service life of the battery cell 100. At the same time, the second support rib 122 can also meet the support strength required by the bottom bracket 10, effectively reducing the risk of the bottom bracket 10 being crushed. This reduces the probability of exhaust failure of the bottom bracket 10, improves the exhaust effect, and thus reduces the probability of thermal runaway of the battery cell 100, improving the reliability and service life of the battery cell 100.

[0157] According to some embodiments of the present invention, such as Figure 9 As shown, the end face of the other end of the second support rib 122 is an arc surface that protrudes in the direction away from the end edge of the support plate 11.

[0158] Specifically, the other end of the second support rib 122 refers to the end facing the middle of the support plate 11. The arc surface can guide the gas flow, which can effectively reduce the probability of eddy current generation and increase the airflow velocity. This allows the gas generated inside the battery cell 100 to flow quickly to the explosion-proof valve and be discharged to the outside of the battery cell 100, thereby effectively reducing the probability of thermal runaway of the battery cell 100.

[0159] In this embodiment, by setting the end face of the other end of the second support rib 122 to be an arc surface that protrudes in the direction away from the end edge of the support plate 11, the probability of eddy current generation can be effectively reduced, thereby increasing the airflow velocity. This allows the gas generated inside the battery cell 100 to flow quickly to the explosion-proof valve and be discharged to the outside of the battery cell 100, thereby effectively reducing the occurrence of thermal runaway of the battery cell 100.

[0160] According to some embodiments of the present invention, such as Figure 9 As shown, the airflow channel 13 includes guide sections 131 and converging areas 132. There are two guide sections 131, each connected to the converging area 132 along the length of the support plate 11 (e.g., along the length of the support plate 11). Figure 9 On both sides (as shown in the left-to-right direction), the guide segment 131 is in the width direction of the support plate 11 (e.g., in the direction from left to right). Figure 9 At least one sidewall (shown in the front-to-back direction) is formed with a guide slope 1213. In the direction from the guide section 131 toward the confluence area 132, the guide slopes 1213 of the two guide sections 131 extend obliquely toward the confluence area 132 on both sides in the width direction of the support plate 11.

[0161] Specifically, the guide section 131 mainly guides the airflow, directing the gas to flow smoothly and making the overall flow more orderly; the converging area 132 is mainly used to converge the airflow, causing the airflow to gather at the explosion-proof valve, and then be discharged through the explosion-proof valve. The explosion-proof valve is located on the bottom wall of the battery cell 100 housing 20, corresponding to the converging area 132, which helps to increase the exhaust effect of the airflow.

[0162] It is understood that the guide section 131 may have a guide slope 1213 formed on one side of the support plate 11 in the width direction, or it may have guide slopes 1213 formed on both sides of the support plate 11 in the width direction. The guide slope 1213 can limit the direction of airflow, making the overall flow more orderly and helping to achieve directional flow of gas.

[0163] In this embodiment, by setting the guide section 131, the gas can be guided to flow smoothly, making the overall flow more orderly and helping to achieve directional gas flow, thereby increasing the smoothness of exhaust. At the same time, by setting the confluence area 132, the airflow entering from both ends can be gathered at the explosion-proof valve, which can increase the gas content at the explosion-proof valve location, thereby increasing the gas discharge speed and improving the exhaust effect.

[0164] According to some embodiments of the present invention, such as Figure 9 As shown, the two first support ribs 121 are arranged rotationally symmetrically about the center of the support plate 11 within the first surface.

[0165] This can be understood as follows: one of the supporting ribs can rotate 180° around the center of the support plate 11 within the first surface and then coincide with the other supporting rib. In other words, the two first supporting ribs 121 have the same shape and size. Thus, the two first supporting ribs 121 can be manufactured by a single mold or process, thereby reducing mold opening costs or manufacturing costs, and thus reducing the production difficulty and cost of the base bracket 10.

[0166] In this embodiment, by setting two first support ribs 121 to be arranged symmetrically about the center of the support plate 11 on the first surface, the two first support ribs 121 can be made by a single mold or process, thereby reducing the mold opening cost or manufacturing cost, and thus reducing the production difficulty and cost of the base bracket 10.

[0167] According to some embodiments of the present invention, such as Figure 9 As shown, the first support rib 121 includes a first support segment 1211 and a second support segment 1212 connected sequentially in the length direction of the support plate 11. At least a portion of the surface of the first support segment 1211 facing the airflow channel 13 is formed as a guide slope 1213. In the direction from the first support segment 1211 to the second support segment 1212, the guide slope 1213 extends obliquely toward the other first support rib 121.

[0168] It is understandable that the surface of the first support section 1211 facing the airflow channel 13 can be partially or entirely formed as a guide slope 1213. The guide slope 1213 extends obliquely from the edge of the support plate 11 along its length toward the center of the support plate 11, which helps to guide the airflow from the inlet of the airflow channel 13 to the explosion-proof valve, thereby achieving directional airflow and increasing the smoothness of exhaust.

[0169] Meanwhile, the two first support ribs 121 are centrally symmetrical, and consequently, the two guide slopes 1213 have the same inclination direction and inclination angle along the length of the support plate 11. As a result, the internal airflow directions of the two air guide sections are opposite. In addition, since a confluence zone 132 is formed between the two air guide sections, the airflows flowing to the confluence zone 132 are staggered, and vortices are formed in the confluence zone 132, thereby accelerating the exhaust of the gas.

[0170] In this embodiment, by setting a first support section 1211 and a second support section 1212, and forming a guide slope 1213 on the side surface of the first support section 1211 facing the airflow channel 13, the airflow can form a vortex in the confluence area 132, thereby accelerating the discharge of gas, which can effectively reduce the internal pressure of the battery cell 100 and reduce the probability of thermal runaway of the battery cell 100.

[0171] According to some embodiments of the present invention, such as Figure 9 As shown, the guide slope 1213 and the end face of the first support rib 121 are rounded.

[0172] It can be understood that the connection between the guide slope 1213 and the end face of the first support rib 121 forms an arc surface. The arc surface can guide the airflow entering the airflow channel 13, allowing the airflow to enter the airflow channel 13 smoothly. This can effectively reduce the generation of vortices at the inlet of the airflow channel 13, improve the airflow velocity and the smoothness of airflow, and allow the gas generated inside the battery cell 100 to flow quickly to the explosion-proof valve and be discharged to the outside of the battery cell 100, thereby effectively reducing the occurrence of thermal runaway of the battery cell 100.

[0173] In this embodiment, by setting a rounded corner between the guide slope 1213 and the end face of the first support rib 121, the generation of vortices at the inlet of the airflow channel 13 can be effectively reduced, the airflow velocity and the smoothness of airflow can be improved, and the gas generated inside the battery cell 100 can flow quickly to the explosion-proof valve and be discharged to the outside of the battery cell 100, thereby effectively reducing the occurrence of thermal runaway of the battery cell 100.

[0174] According to some embodiments of the present invention, the fillet radius between the guide slope 1213 and the end face of the first support rib 121 is 2.5mm-5mm.

[0175] For example, the fillet radius between the guide slope 1213 and the end face of the first support rib 121 can be 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0176] In this embodiment, by setting the radius of the fillet between the guide slope 1213 and the end face of the first support rib 121 to 2.5mm-5mm, the fillet between the guide slope 1213 and the end face of the first support rib 121 is not too large, which is beneficial to the production of the fillet and reduces the impact on the guide slope 1213. At the same time, it also ensures that the fillet between the guide slope 1213 and the end face of the first support rib 121 is not too small, which is beneficial to the reduction of eddies, thereby improving the airflow velocity and the smoothness of airflow, and improving the exhaust effect.

[0177] According to some embodiments of the present invention, such as Figure 9As shown, the surface of the first support section 1211 facing the airflow channel 13 also includes a guide slope 1214. The guide slope 1214 is connected to one end of the guide slope 1213 facing the second support section 1212. In the direction from the first support section 1211 to the second support section 1212, the guide slope 1214 extends obliquely toward the other side surface of the first support rib 121 away from the airflow channel 13. The confluence area 132 is formed between the guide slopes 1214 of the two first support ribs 121.

[0178] It is understandable that the inclination direction of the diversion slope 1214 is opposite to that of the guide slope 1213. Consequently, the guide slope 1213 of the same first support section 1211 can impede the movement of the airflow entering from the end opposite to the guide slope 1213 in the length direction. Thus, when the airflow moves from the two guide sections 131 to the confluence area 132, when the airflow reaches the diversion slope 1214, the diversion slope 1214 will impede the flow of the airflow, thereby changing the original flow trajectory of the airflow and causing the airflow to move along the tangent direction of the diversion slope 1214. At the same time, since the two first support ribs 121 are arranged symmetrically around the center of the support plate 11, the two airflows entering the confluence area 132 move in opposite directions and do not collide directly, which can further promote the generation of vortices and accelerate the discharge of gas.

[0179] In this embodiment, by setting the flow-guiding inclined surface 1214, the original flow trajectory of the airflow can be changed, so that the two airflows entering the confluence zone 132 move in opposite directions and do not collide directly, thereby further promoting the generation of vortices and accelerating the discharge of gas.

[0180] According to some embodiments of the present invention, such as Figure 9 As shown, the angle between the drainage slope 1214 and the length direction of the support plate 11 is greater than the angle between the guide slope 1213 and the length direction of the support plate 11.

[0181] The angle between the drainage slope 1214 and the support plate 11 along its length is the angle between the tangent of the drainage slope 1214 and the edge of the support plate 11 along its length; the angle between the guide slope 1213 and the support plate 11 along its length is the angle between the tangent of the guide slope 1213 and the edge of the support plate 11 along its length.

[0182] Specifically, the length of the drainage slope 1214 in the length direction of the support plate 11 can be controlled by controlling the angle between the drainage slope 1214 and the support plate 11, and the length of the guide slope 1213 in the length direction of the support plate 11 can be controlled by controlling the angle between the guide slope 1213 and the support plate 11, thereby limiting the size of the guide section 131 and the confluence area 132.

[0183] In this embodiment, by setting the angle between the diversion slope 1214 and the length direction of the support plate 11 to be greater than the angle between the guide slope 1213 and the length direction of the support plate 11, the range of the confluence area 132 can be limited to be smaller than the range of the guide section 131. Thus, the range of the confluence area 132 can be limited to the position of the explosion-proof valve, thereby increasing the exhaust effect.

[0184] According to some embodiments of the present invention, such as Figure 3 As shown, the drainage slope 1214 is connected to the guide slope 1213 by an arc.

[0185] In this embodiment, by setting the flow-guiding slope 1214 and the guide slope 1213 to be connected by an arc, the generation of vortices at the connection between the flow-guiding slope 1214 and the guide slope 1213 can be reduced, thereby increasing the airflow speed and further accelerating the generation of vortices. This allows the airflow to be quickly discharged from the battery cell 100, reducing the pressure inside the battery cell 100 and reducing the occurrence of thermal runaway of the battery cell 100.

[0186] According to some embodiments of the present invention, the side surface of the second support section 1212 facing the airflow channel 13 is a plane parallel to the length direction of the support plate 11.

[0187] Specifically, the cross-section of the second support segment 1212 is rectangular, one side of the second support segment 1212 is flush with the edge of the support plate 11 in the length direction, and the other side is parallel to the plane of the support plate 11 in the length direction.

[0188] In this embodiment, by setting the surface of the second support section 1212 facing the airflow channel 13 to be a plane parallel to the length direction of the support plate 11, the production convenience and production rate of the support frame 12 can be improved. At the same time, it is also convenient to control the size of the airflow channel 13 and ensure the exhaust effect.

[0189] According to some embodiments of the present invention, in the width direction of the support plate 11, the ratio of the width of the second support segment 1212 to the maximum width of the first support segment 1211 is 0.25-0.45.

[0190] For example, in the width direction of the support plate 11, the ratio of the width of the second support segment 1212 to the maximum width of the first support segment 1211 can be 0.25, 0.3, 0.4 or 0.45.

[0191] In this embodiment, by setting the ratio of the width of the second support section 1212 to the maximum width of the first support section 1211 to 0.25-0.45, the width of the second support section 1212 is not too large, so as to ensure the width of the airflow channel 13 and meet the exhaust requirements of the battery cell 100. At the same time, it also ensures that the width of the second support section 1212 is not too small, which is beneficial to improving the support effect on the support plate 11, thereby improving the support strength of the bottom bracket 10 and effectively reducing the risk of the bottom bracket 10 being crushed.

[0192] According to some embodiments of the present invention, the ratio of the projected area of ​​the support frame 12 in the first surface to the area of ​​the first surface is 0.15-0.4.

[0193] For example, the ratio of the projected area of ​​the support frame 12 on the first surface to the area of ​​the first surface can be 0.15, 0.2, 0.25, 0.3, 0.35 or 0.4.

[0194] In this embodiment, by setting the ratio of the projected area of ​​the support frame 12 on the first surface to the area of ​​the first surface to be 0.15-0.4, it is beneficial to improve the structural strength and stability of the bottom support 10, thereby effectively preventing the bottom support from being crushed. At the same time, it can also limit the flow area of ​​the airflow channel 13, so that the flow area of ​​the airflow channel 13 can meet the exhaust requirements, allowing the gas in the battery cell 100 during the cycle to be discharged in time, reducing the internal pressure of the battery cell 100, thereby reducing the probability of thermal runaway of the battery cell 100, and improving the reliability and service life of the battery cell 100.

[0195] According to some embodiments of the present invention, the height of the support frame 12 in the thickness direction of the support plate 11 is 0.6mm-5mm.

[0196] For example, the height of the support frame 12 in the thickness direction of the support plate 11 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, or 5mm. Since the gas content produced by different types of battery cells 100 varies, the height of the support frame 12 can be selected according to the gas production rate. This ensures that the base bracket 10 can guarantee smooth venting of the battery cells 100 while reducing the space occupied by the base bracket 10, thereby increasing the energy density of the battery cells 100.

[0197] In this embodiment, by setting the height of the support frame 12 to 0.6mm-5mm in the thickness direction of the support plate 11, the bottom bracket 10 can ensure the smooth exhaust of the battery cell 100, reduce the space occupied by the bottom bracket 10, and improve the energy density of the battery cell 100.

[0198] According to some embodiments of the present invention, the height of the support frame 12 in the thickness direction of the support plate 11 is 0.6mm-3mm.

[0199] For example, in the thickness direction of the support plate 11, the height of the support frame 12 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm or 3mm.

[0200] In this embodiment, by setting the height of the support frame 12 to 0.6mm-3mm in the thickness direction of the support plate 11, the height of the support frame 12 is not too high, which is beneficial to improving the energy density of the battery cell 100. At the same time, the height of the support frame 12 is not too low, so that the height of the support frame 12 can meet the exhaust requirements, thereby improving the exhaust effect.

[0201] According to some embodiments of the present invention, the battery cell 100 is a lithium iron phosphate battery 1000, and the height of the support frame 12 is 0.6mm-1mm; or, the battery cell 100 is a ternary polymer lithium battery 1000, and the height of the support frame 12 is 0.6mm-3mm.

[0202] In some specific embodiments, the battery cell 100 is a lithium iron phosphate battery 1000, and the height of the support frame 12 is 0.6mm-1mm. For example, the height of the support frame 12 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm. In other specific embodiments, the battery cell 100 is a ternary polymer lithium battery 1000, and the height of the support frame 12 is 0.6mm-3mm. For example, the height of the support frame 12 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, or 3mm.

[0203] Specifically, lithium iron phosphate battery 1000 refers to a lithium-ion battery 1000 that uses lithium iron phosphate as the positive electrode material; ternary polymer lithium battery 1000 refers to a lithium battery 1000 that uses lithium nickel cobalt manganese oxide as the positive electrode material and graphite as the negative electrode material. Because ternary materials have more surface-free lithium compounds, the gas production of ternary polymer lithium battery 1000 during cycling is greater than that of lithium iron phosphate battery 1000.

[0204] In this embodiment, when the battery cell 100 is a lithium iron phosphate battery 1000, the height of the support frame 12 is set to 0.6mm-1mm; when the battery cell 100 is a ternary polymer lithium battery 1000, the height of the support frame 12 is set to 0.6mm-3mm. This allows the height of the support frame 12 to be designed according to the type of battery cell 100. In this way, the bottom bracket 10 can meet the venting requirements while reducing the space occupied by the bottom bracket 10 and improving the energy density of the battery cell 100.

[0205] According to some embodiments of the present invention, the thickness of the support plate 11 is 0.4mm-0.6mm.

[0206] For example, the thickness of the support plate 11 can be 0.4mm, 0.5mm or 0.6mm.

[0207] In this embodiment, by setting the thickness of the support plate 11 to 0.4mm-0.6mm, the support plate 11 can not only fulfill the supporting function of the bottom bracket 10 for the electrode assembly 30, but also reduce the material used in the support plate 11, thereby reducing the production difficulty and cost of the support plate 11. At the same time, setting the thickness range of the support plate 11 to [0.4mm, 0.6mm] can also reduce the thickness of the bottom bracket 10, thereby increasing the energy density of the battery cell 100.

[0208] According to some embodiments of the present invention, the base bracket 10 is a polypropylene component, or the base bracket 10 is an aluminum component.

[0209] In some specific embodiments, the base bracket 10 is a polypropylene component; in other specific embodiments, the base bracket 10 is an aluminum component.

[0210] Specifically, polypropylene (PP) is a polymer formed by the addition polymerization of propylene. Polypropylene is a high-performance thermoplastic synthetic resin with good corrosion resistance, heat resistance, electrical insulation, high mechanical strength, and high wear resistance. Therefore, using polypropylene to manufacture the base support 10 can reduce the possibility of the base support 10 being corroded by the electrolyte or damaged by pressure, thereby improving the reliability and service life of the base support 10. In addition, polypropylene is relatively inexpensive; therefore, using polypropylene can also reduce the production cost of the base support 10 and the production cost of the battery cell 100.

[0211] Aluminum is a product made of aluminum and other alloying elements. It has good structural strength, corrosion resistance, heat resistance and electrical insulation. Aluminum is also lightweight. Therefore, using aluminum to make the base bracket 10 can not only meet the support performance and corrosion resistance of the base bracket 10, but also reduce the weight of the base bracket 10, thereby reducing the weight of the battery cell 100 and achieving the lightweighting of the battery 1000.

[0212] In this embodiment, by setting the base bracket 10 to a polypropylene component, the possibility of the base bracket 10 being corroded by the electrolyte or crushed can be reduced, thereby improving the reliability and service life of the base bracket 10; at the same time, the production cost of the battery cell 100 can also be reduced; by setting the base bracket 10 to an aluminum component, the support performance and corrosion resistance of the base bracket 10 can be increased, while the weight of the base bracket 10 can be reduced, thereby reducing the weight of the battery cell 1000, thus achieving the lightweighting of the battery 1000.

[0213] The battery 1000 according to a second aspect embodiment of the present invention includes a battery cell 100 according to a first aspect embodiment of the present invention.

[0214] In some specific embodiments of the present invention, for example Figures 4-12 As shown, the battery 1000 may further include: a main box 201 and a cover plate 202. The main box 201 has a cavity with an open top, in which multiple battery cells 100 are disposed. The cover plate 202 is sealed to the top of the main box 201 by fasteners.

[0215] Optionally, multiple battery cells 100 can be stacked and arranged in the cavity along the thickness direction of the battery cells 100.

[0216] Optionally, the main box 201 is formed into a rectangular box shape, with a cavity defined on the inner side of the main box 201 and an open top. The main box 201 is provided with a plurality of first fixing holes. The cover plate 202 is formed into a horizontally arranged flat plate shape. The cover plate 202 is provided with a plurality of second fixing holes that penetrate the cover plate 202 in the vertical direction. The plurality of first fixing holes and the plurality of second fixing holes correspond one-to-one and are vertically opposite. The battery 1000 also includes a plurality of fasteners. The plurality of fasteners pass through the first fixing holes and the second fixing holes to fasten the cover plate 202 to the upper side of the main box 201 body 200.

[0217] Alternatively, the cover plate 202 can be made of carbon steel, aluminum or composite material.

[0218] In this embodiment, by setting the housing 200 as a separate main housing 201 and cover plate 202, it is convenient to install the battery cell 100 into the housing 200. The main housing 201 and cover plate 202 are connected by fasteners, which can realize a detachable connection, facilitate maintenance and replacement, and ensure the connection strength between the main housing 201 and cover plate 202, thus ensuring the overall structural strength of the battery 1000.

[0219] In some specific embodiments of the present invention, a first adhesive layer is provided on the bottom wall of the cavity, and the bottom of the plurality of battery cells 100 is connected to the bottom wall of the main box 201 through the first adhesive layer; and / or, a second adhesive layer is provided on the cover plate 202, and the top of the plurality of battery cells 100 is connected to the cover plate 202 through the second adhesive layer.

[0220] The battery 1000 may include only the first adhesive layer, only the second adhesive layer, or both the first adhesive layer and the second adhesive layer. The first adhesive layer is used to bond the bottom wall of the main box 201 to the battery cell 100, and the second adhesive layer is used to bond the cover plate 202 to the battery cell 100, so as to reliably fix the multiple battery cells 100 in the box 200, improve the reliability and stability of the connection between the battery cell 100 and the box 200, and prevent the battery cell 100 from shaking in the box 200.

[0221] In this embodiment, by setting a first adhesive layer and a second adhesive layer, and by bonding and fixing the bottom of the battery cell 100 to the bottom wall of the main box 201 through the first adhesive layer, and bonding and fixing the top of the battery cell 100 to the cover plate 202 through the second adhesive layer, the overall strength of the battery 1000 can be improved and the connection stability of the battery cell 100 can be guaranteed.

[0222] According to the battery 1000 of the present invention, by providing the battery cell 1000 of the first aspect embodiment described above, the overall performance of the battery 1000 is improved.

[0223] An electrical appliance according to a third aspect of the present invention includes a battery 1000 according to a second aspect of the present invention.

[0224] According to embodiments of the present invention, by providing the battery 1000 of the third aspect embodiment described above, the overall performance of the electrical equipment is improved.

[0225] The following will refer to Figure 4 A battery cell 100 according to two specific embodiments of the present invention is described.

[0226] Example 1,

[0227] Reference Figure 9 The battery cell 100 includes an end cap 40, an adapter piece 50, an electrode assembly 30, a bottom support 10, and a housing 20. The housing 20 has an open end, and the end cap 40 is located on one side of the open end of the housing 20 to seal the open end of the housing 20. The housing 20 has a receiving cavity 21, and an explosion-proof valve is provided at the bottom of the housing 20. The electrode assembly 30 and the bottom support 10 are both located in the receiving cavity 21. The bottom support 10 is located on the bottom wall of the receiving cavity 21, and the electrode assembly 30 is located on the upper side of the bottom support 10. The bottom support 10 and the bottom wall of the housing 20 together form an exhaust space. The bottom support 10 is a polypropylene component.

[0228] Specifically, the base support 10 also includes a support plate 11 and a support frame 12, wherein the support plate 11 is formed as a rectangular plate, and the support frame 12 is located on the lower side of the support plate 11.

[0229] The support frame 12 includes two first support ribs 121 and two second support ribs 122. The first support ribs 121 and the second support ribs 122 extend along the length of the support plate 11. The two first support ribs 121 are respectively arranged at both ends of the support plate 11 in the width direction and are flush with the two side edges of the support plate 11 in the width direction. The two second support ribs 122 are respectively arranged at both ends of the support plate 11 in the length direction and are located between the two first support ribs 121. In the length direction of the support plate 11, one end of the second support rib 122 is flush with the end edge of the support plate 11 in the length direction, and the other end extends toward the middle of the support plate 11 and forms an arc surface that protrudes toward the direction away from the end edge of the support plate 11. An airflow channel 13 is defined between the two first support ribs 121.

[0230] Furthermore, in the direction from one end of the support plate 11 to the other end along its length, the side edge of the first support rib 121 facing the airflow channel 13 extends along an arc protruding towards the airflow channel 13, and the diameter of the arc is 130mm-180mm.

[0231] In the width direction of the support plate 11, the width of the first support rib 121 at both ends in the length direction of the support plate 11 is 8mm-11mm; the maximum width of the first support rib 121 is 12mm-16mm. In the length direction of the support plate 11, the length of the second support rib 122 is 20mm-30mm; the ratio of the length of the second support rib 122 to the length of the support plate 11 is 0.07-0.12. In the thickness direction of the support plate 11, the thickness of the support plate 11 is 0.4mm-0.6mm, and the height of the support frame 12 is 0.6mm-3mm.

[0232] When the battery cell 100 is used in cycles, a large amount of gas is generated inside the battery cell 100. The gas can enter the airflow channel 13 through both ends of the first support rib 121 in the length direction, and then be discharged to the explosion-proof valve through the airflow channel 13. Therefore, the bottom bracket 10 of this application can improve the exhaust situation inside the battery cell 100, reduce the internal pressure of the battery cell 100, and thus reduce the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the casing 20 caused by excessive pressure.

[0233] According to the battery cell 100 of the present invention, by setting the bottom support 10 of the first aspect embodiment, the airflow channel 13 is defined by two first support ribs 121, and the two first support ribs 121 are respectively flush with the two side edges of the support plate 11 in the width direction. This can effectively prevent the formation of flow stagnation areas at the edges of the first support ribs 121 and the support plate 11, reduce the bulging phenomenon caused by the accumulation of airflow at the connection between the first support ribs 121 and the support plate 11, and allow airflow to enter the airflow channel 13 from both ends, thereby improving the exhaust effect. At the same time, it can also increase the cross-sectional area of ​​the airflow channel 13, thereby further increasing the exhaust space of the bottom support 10 and improving the exhaust effect. This can reduce the internal pressure of the battery cell 100, reduce the probability of thermal runaway of the battery cell 100 and the risk of cracking of the weld of the casing 20 due to excessive pressure.

[0234] Example 2,

[0235] Reference ​ The structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the support frame 12 in Embodiment 1 includes two first support ribs 121 and two second support ribs 122, and the first support ribs 121 extend along an arc along one side edge of the airflow channel 13. In this embodiment, the support frame 12 only includes two first support ribs 121, and the first support ribs 121 include a first support section 1211 and a second support section 1212.

[0236] Specifically, the first support segment 1211 and the second support segment 1212 are sequentially connected along the length of the support plate 11. A portion of the surface of the first support segment 1211 facing the airflow channel 13 is formed as a guide slope 1213, which extends obliquely toward another first support rib 121 in the direction from the first support segment 1211 toward the second support segment 1212. The other portion is formed as a drainage slope 1214, which connects to the guide slope 1213 facing the second support segment. At one end of 1212, in the direction from the first support section 1211 toward the second support section 1212, the flow-guiding slope 1214 extends obliquely toward the other side surface of the first support rib 121 that is away from the airflow channel 13, and the flow-guiding slope 1214 is connected to the guide slope 1213 by an arc. One end of the second support section 1212 is connected to the flow-guiding slope 1214, and the other end extends along the length direction of the support plate 11. The side surface of the second support section 1212 facing the airflow channel 13 is a plane parallel to the length direction of the support plate 11.

[0237] Furthermore, the airflow channel 13 includes a guide section 131 and a confluence zone 132. There are two guide sections 131, which are respectively connected to both sides of the confluence zone 132 in the length direction of the support plate 11. The confluence zone 132 is formed between the flow-guiding slopes 1214 of the two first support ribs 121.

[0238] In addition, the guide slope 1213 and the end face of the first support rib 121 are rounded with a radius of 2.5mm-5mm. In the width direction of the support plate 11, the ratio of the width of the second support section 1212 to the maximum width of the first support section 1211 is 0.25-0.45.

[0239] According to the battery cell 100 of the present invention, by setting the bottom bracket 10 of the present embodiment, the exhaust effect can be improved and the number of support ribs can be reduced, thereby simplifying the manufacturing process of the bottom bracket 10, reducing the production cost of the bottom bracket 10, and increasing the production rate of the bottom bracket 10, thereby reducing the overall cost of the battery cell 100 and increasing the assembly rate of the battery cell 100.

[0240] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention 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 utility model relates to a shell (20) which defines a containing cavity (21), the bottom of shell (20) is equipped with explosion -proof valve, The bottom support (10) is arranged on the bottom wall of the containing cavity (21), and the bottom support (10) comprises a support plate (11) and a support frame (12), one side surface of the support plate (11) towards the bottom wall of the containing cavity (21) is a first surface, the support frame (12) comprises at least one first support rib (121), the first support rib (121) is arranged on the first surface and extends along the length direction of the support plate (11), at least one first support rib (121) is arranged on at least one side edge of the support plate (11) in the width direction, the first support rib (121), the first surface and the bottom wall of the containing cavity (21) define an air flow channel (13) in communication with the explosion -proof valve, the first support rib (121) extends from one end to the other end of the length direction of the support plate (11), and in the direction from the two ends to the middle of the length direction of the support plate (11), the width of the first support rib (121) in the width direction of the support plate (11) gradually increases, The electrode assembly (30) is arranged in the containing cavity (21) and supported on the second surface of the support plate (11), and the first surface and the second surface are oppositely arranged in the thickness direction of the support plate (11). The number of the first support rib (121) is two, and the two first support ribs (121) are arranged on the two side edges of the support plate (11) in the width direction, 2. The battery cell of claim 1, wherein, At least part of the two first support ribs (121) is flush with the two side edges of the support plate (11) in the width direction. In the direction from one end to the other end of the length direction of the support plate (11), the side edge of the first support rib (121) towards the air flow channel (13) extends along an arc line protruding towards the air flow channel (13).

3. The battery cell of claim 1, wherein, The side edge of the first support rib (121) extends along a circular arc line, and the diameter of the circular arc line is 130mm-180mm.

4. The battery cell of claim 3, wherein, In the width direction of the support plate (11), the width of the first support rib (121) at the two ends in the length direction of the support plate (11) is 8mm-11mm.

5. The battery cell of claim 1, wherein, In the width direction of the support plate (11), the maximum width of the first support rib (121) is 12mm-16mm.

6. The battery cell of claim 1, wherein, The support frame (12) further comprises two second support ribs (122), the second support ribs (122) extend along the length direction of the support plate (11) and are arranged between the two first support ribs (121), and the two second support ribs (122) are arranged at the two ends of the support plate (11) in the length direction.

7. The battery cell of any one of claims 1-6, wherein, In the length direction of the support plate (11), one end of the second support rib (122) is flush with the end edge of the support plate (11) in the length direction.

8. The battery cell of claim 7, wherein, ​ 9. The battery cell of claim 8, wherein, The length of the second support rib (122) in the length direction of the support plate (11) is 20-30 mm.

10. The battery cell of claim 8, wherein, The ratio of the length of the second support rib (122) to the length of the support plate (11) in the length direction of the support plate (11) is 0.07-0.

12.

11. The battery cell of claim 8, wherein, The end face of the other end of the second support rib (122) is an arc surface protruding towards the direction away from the end edge of the support plate (11).

12. The battery cell of claim 1, wherein, The ratio of the projected area of the support frame (12) in the first surface to the area of the first surface is 0.15-0.

4.

13. The battery cell of claim 1, wherein, The height of the support frame (12) in the thickness direction of the support plate (11) is 0.6-5 mm.

14. The battery cell of claim 1, wherein, The height of the support frame (12) in the thickness direction of the support plate (11) is 0.6-3 mm.

15. The battery cell of claim 14, wherein, The battery cell is a lithium iron phosphate battery, and the height of the support frame (12) is 0.6-1 mm; or, The battery cell is a ternary polymer lithium battery, and the height of the support frame (12) is 0.6-3 mm.

16. The battery cell of claim 1, wherein, The thickness of the support plate (11) is 0.4-0.6 mm.

17. The battery cell of claim 1, wherein, The bottom support (10) is a polypropylene piece, or the bottom support (10) is an aluminum piece.

18. A battery cell, characterized by Comprising: A shell (20) defining a containing cavity (21), the bottom of the shell (20) being provided with an explosion-proof valve; A bottom support (10) provided on the bottom wall of the containing cavity (21), the bottom support (10) comprising a support plate (11) and a support frame (12), the side surface of the support plate (11) facing the bottom wall of the containing cavity (21) being a first surface, the support frame (12) comprising at least one first support rib (121), the first support rib (121) being provided on the first surface and extending in the length direction of the support plate (11), at least one first support rib (121) being arranged on at least one side edge of the support plate (11) in the width direction, the first support rib (121), the first surface and the bottom wall of the containing cavity (21) defining an airflow passage (13) communicating with the explosion-proof valve, the airflow passage (13) comprising a guide section (131) and a confluence area (132), the number of guide sections (131) being two and being connected to both sides of the confluence area (132) in the length direction of the support plate (11), the guide section (131) being formed with a guide inclined surface (1213) on at least one side wall of the support plate (11) in the width direction, in the direction from the guide section (131) to the confluence area (132), the guide inclined surfaces (1213) of the two guide sections (131) respectively extend obliquely towards both sides of the confluence area (132) in the width direction of the support plate (11); An electrode assembly (30) is arranged in the accommodating cavity (21) and supported on a second surface of the support plate (11), the first surface and the second surface being oppositely arranged in the thickness direction of the support plate (11).

19. The battery cell of claim 18, wherein, The number of the first support ribs (121) is two, and the two first support ribs (121) are respectively arranged on the two side edges of the support plate (11) in the width direction, At least part of the two first support ribs (121) is flush with the two side edges of the support plate (11) in the width direction.

20. The battery cell of claim 18, wherein, The two first support ribs (121) are rotationally symmetrically arranged about the center of the support plate (11) in the first surface.

21. The battery cell of claim 20, wherein, The first support rib (121) comprises a first support section (1211) and a second support section (1212) connected in sequence in the length direction of the support plate (11), at least part of the side surface of the first support section (1211) facing the airflow channel (13) is formed as the guide slope (1213), and the guide slope (1213) extends obliquely towards the other first support rib (121) in the direction from the first support section (1211) to the second support section (1212).

22. The battery cell of claim 21, wherein, The guide slope (1213) and the end surface of the first support rib (121) are chamfered.

23. The battery cell of claim 22, wherein, The chamfer radius between the guide slope (1213) and the end surface of the first support rib (121) is 2.5mm-5mm.

24. The battery cell of claim 21, wherein, The side surface of the first support section (1211) facing the airflow channel (13) further comprises a drainage slope (1214) connected at one end of the guide slope (1213) facing the second support section (1212), the drainage slope (1214) extends obliquely towards the other side surface of the first support rib (121) away from the airflow channel (13) in the direction from the first support section (1211) to the second support section (1212), and the drainage slope (1214) is formed between the two first support ribs (121).

25. The battery cell of claim 24, wherein, The included angle between the drainage slope (1214) and the length direction of the support plate (11) is greater than the included angle between the guide slope (1213) and the length direction of the support plate (11).

26. The battery cell of claim 24, wherein, The drainage slope (1214) and the guide slope (1213) are connected in an arc.

27. The battery cell of claim 21, wherein, The side surface of the second support section (1212) facing the airflow channel (13) is a plane parallel to the length direction of the support plate (11).

28. The battery cell of claim 27, wherein, The ratio of the width of the second support section (1212) to the maximum width of the first support section (1211) in the width direction of the support plate (11) is 0.25-0.

45.

29. The battery cell of claim 18, wherein, The ratio of the projection area of the support frame (12) in the first surface to the area of the first surface is 0.15-0.

4.

30. The battery cell of claim 18, wherein, The height of the support frame (12) in the thickness direction of the support plate (11) is 0.6mm-5mm.

31. The battery cell of claim 18, wherein, The height of the support frame (12) in the thickness direction of the support plate (11) is 0.6mm-3mm.

32. The battery cell of claim 31, wherein, The battery cell is a lithium iron phosphate battery, and the height of the support frame (12) is 0.6mm-1mm; or, The battery cell is a ternary polymer lithium battery, and the height of the support frame (12) is 0.6mm-3mm.

33. The battery cell of claim 18, wherein, The thickness of the support plate (11) is 0.4mm-0.6mm.

34. The battery cell of claim 18, wherein, The bottom support (10) is a polypropylene piece, or the bottom support (10) is an aluminum piece.

35. A battery, comprising: The battery cell according to any one of claims 1-34.

36. An electrical device, comprising: The battery according to claim 35.

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