Lower plastic part, end cover assembly, battery and electric device

Abstract

The application relates to a lower plastic part, an end cover assembly, a battery and an electric device. The lower plastic part comprises a body part and a protruding part, the protruding part is connected to the end of the body part; the protruding part comprises a bottom plate, a first side plate and a connecting assembly, the bottom plate, the first side plate and the body part are sequentially connected, in the first direction, the bottom plate and the body part respectively extend in the direction opposite to the first side plate; the connecting assembly is used for connecting the bottom plate, the first side plate and the body part; the bottom plate, the first side plate and the connecting assembly enclose a ventilation groove, the ventilation groove extends in the first direction and penetrates at least part of the first side plate, the first direction is the length direction of the lower plastic part; in the first direction, the end of the part corresponding to the part of the ventilation groove on the side of the bottom plate away from the body part is provided with a chamfer.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a lower plastic part, an end cap assembly, a battery, and an electrical device. Background Technology

[0002] To prevent short circuits caused by direct contact between the battery cell (or bare cell, electrode assembly) and the metal casing, an insulating film (Mylar film) is usually placed between the cell and the metal casing. To improve the integration of the end cap assembly and the cell, make assembly easier, and increase structural strength, the insulating film is usually heat-fused to the edge of the lower plastic part of the end cap assembly.

[0003] Furthermore, as the battery capacity increases, the amount and rate of gas generation during thermal runaway of the electrode assembly also increase. Therefore, the requirements for the venting rate of the battery are increased. Commonly, venting channels are provided at the ends of the lower plastic parts along the length direction. However, after the venting channels are provided on the lower plastic parts, the venting channels and the edges of the lower plastic parts form a right angle. This right angle is very easy to scratch the Mylar or separator during the assembly process. Both of these can cause internal short circuits in the electrode assembly, thereby triggering thermal runaway and leading to a series of safety problems. Summary of the Invention

[0004] In view of this, this application provides a lower plastic part, an end cap assembly, a battery, and an electrical device. The lower plastic part can avoid scratching the insulating film and separator, and when the lower plastic part is applied to the battery, the battery has better safety performance.

[0005] This application provides a lower plastic part, the lower plastic part comprising: a body portion and a protrusion portion, the protrusion portion being connected to an end of the body portion; the protrusion portion comprising a base plate, a first side plate, and a connecting assembly, the base plate, the first side plate, and the body portion being sequentially connected, the base plate and the body portion extending in opposite directions relative to the first side plate along a first direction; the connecting assembly being used to connect the base plate, the first side plate, and the body portion; the base plate, the first side plate, and the connecting assembly forming a venting groove, the venting groove extending along a first direction and penetrating at least a portion of the first side plate, the first direction being the length direction of the lower plastic part; along the first direction, the end of the base plate on the side opposite to the body portion and corresponding to the portion of the venting groove is provided with a chamfer.

[0006] Furthermore, the connecting assembly includes a first connecting plate and a second connecting plate, both of which are disposed on the surface of the base plate facing the body portion and located on the side of the first side plate away from the body portion. Along the second direction, the first connecting plate and the second connecting plate are spaced apart, and both extend along the first direction. The base plate, the first side plate, the first connecting plate, and the second connecting plate form a ventilation groove, which at least partially penetrates the first side plate. The second direction is the width direction of the lower plastic part, and the second direction intersects the first direction.

[0007] Further, along a third direction, the main body has a first surface and a second surface disposed opposite to each other, the first surface being closer to the base plate than the second surface; the base plate includes a first arc-shaped sub-part, a base plate sub-part, and a second arc-shaped sub-part connected in sequence, along a third direction, the end face of the first arc-shaped sub-part facing the first surface is closer to the first surface than the end face of the base plate sub-part facing the first surface, and the end face of the second arc-shaped sub-part facing the first surface is closer to the first surface than the end face of the base plate sub-part facing the first surface, along the first direction, the second base plate sub-part, and the first arc-shaped sub-part are arranged in sequence, wherein the third direction is the height direction of the lower plastic part, and the first direction, the second direction, and the third direction intersect each other in pairs; the chamfer includes a first chamfer and a second chamfer, the first arc-shaped sub-part has a first chamfer on the side away from the main body, and the second arc-shaped sub-part has a second chamfer on the side away from the main body.

[0008] Furthermore, the first arc-shaped sub-part has a first arc-shaped surface and a first end face that are bent and connected. The first arc-shaped surface is disposed facing the vent groove, and the first end face is disposed facing the extension surface of the second surface. The end of the first end face that is away from the first arc-shaped surface is connected to the base plate sub-part. The body part has a second end face facing the vent groove. Along a third direction, the orthographic projection of the intersection line of the first arc-shaped surface and the first end face on the body part is offset from the orthographic projection of the second end face of the body part on the body part. The third direction is the height direction of the lower plastic part, and the first direction, the second direction, and the third direction intersect each other in pairs.

[0009] Further, the base plate includes a first arc-shaped sub-part, a base plate sub-part, and a second arc-shaped sub-part connected in sequence. Along the first direction, the second arc-shaped sub-part, the base plate sub-part, and the first arc-shaped sub-part are arranged in sequence. The first arc-shaped sub-part has a first arc-shaped surface and a first end face that are bent and connected. The first arc-shaped surface faces the vent groove, and the first end face faces the extension surface of the second surface. The second surface is a surface of the body part that is located further away from the base plate along a third direction, and the third direction intersects with the first direction. The body part has a second end face facing the vent groove. Along the third direction, the distance between the orthographic projection of the boundary line between the first arc-shaped surface and the first end face on the body part and the orthographic projection of the second end face of the body part on the body part is h. Then, h satisfies the range: 0.1mm ≤ h ≤ 0.35mm.

[0010] Furthermore, along the third direction upward, the orthographic projection of the end of the first end face away from the first arcuate surface on the body portion is offset from the orthographic projection of the second end face on the body portion.

[0011] Furthermore, the lower plastic part satisfies at least one of the following conditions: the orthographic projection of the end of the first end face away from the first arc-shaped surface on the body portion is farther away from the second arc-shaped sub-part than the orthographic projection of the second end face on the body portion; the orthographic projection of the end of the first end face away from the first arc-shaped surface on the body portion is closer to the second arc-shaped sub-part than the orthographic projection of the second end face on the body portion.

[0012] Furthermore, the protrusion also includes a second side plate extending upward along the third direction. The second side plate and the first side plate are located on the same side of the base plate. The second side plate is connected to the end of the base plate away from the first side plate, and the ventilation groove also penetrates through the second side plate.

[0013] Furthermore, the second arc-shaped sub-part has a second arc-shaped surface and a third end face that are bent and connected together. The second arc-shaped surface and the third end face are disposed facing the ventilation groove. The end of the second arc-shaped surface facing away from the third end face is connected to the base plate sub-part. Along the third direction, the third end face is closer to the body part than the surface of the base plate sub-part facing the first surface.

[0014] This application provides an end cap assembly, which includes an end cap and a lower plastic component provided in this application, wherein the lower plastic component is disposed on one side of the end cap.

[0015] This application provides a battery comprising: an end cap assembly, a housing, an electrode assembly, and an insulating film. The housing is disposed on one side of the end cap assembly and connected to the end cap assembly, and the housing has an accommodating cavity. The electrode assembly is disposed within the housing and is electrically connected to the end cap assembly. The insulating film is sleeved on the outer periphery of the electrode assembly to achieve insulation between the electrode assembly and the housing, and at least a portion of the insulating film is also connected to the protrusion.

[0016] This application provides an electrical device, which includes: a device body and a battery provided in this application, wherein the battery supplies power to the device body.

[0017] In this application, the protrusion connects to the end of the body portion. The base plate, the first side plate, and the body portion are sequentially connected. Along the first direction, the base plate and the body portion extend in opposite directions relative to the first side plate, so the protrusion at least partially protrudes from one side of the body portion. When the lower plastic part is applied to the end cap assembly and assembled into the battery, the surface of the protrusion facing away from the end cap is closer to the electrode assembly than the surface of the body portion facing away from the end cap, so that when the electrode assembly expands or floats toward the end cap assembly, the protrusion can be used to abut and limit the electrode assembly. Further, the connecting assembly is used to connect the base plate, the first side plate, and the body portion. The base plate, the first side plate, and the connecting assembly form a venting groove. The venting groove extends along the first direction and penetrates at least a portion of the first side plate, so the venting groove can be used to connect the side of the protrusion facing away from the body portion and the side of the protrusion close to the body portion. When the lower plastic part is applied to the end cap assembly and assembled into the battery, in the event of thermal runaway and the generation of a large amount of gas in the battery, the airflow can flow from the gap between the electrode assembly and the housing to the side of the protrusion facing away from the main body. Furthermore, the airflow flows through the venting groove to the side of the protrusion facing away from the main body, and further converges near the explosion-proof valve. The venting groove improves the battery's venting efficiency, allowing the explosion-proof valve to release pressure promptly and improving the battery's safety performance. In addition, at least a portion of the insulating film is connected to the protrusion; specifically, the insulating film is connected to the side of the protrusion facing away from the main body. Along the first direction, the end of the base plate facing away from the main body and corresponding to the venting groove has a chamfer. More specifically, the end of the base plate away from the main body has a second chamfer. This second chamfer prevents direct tearing of the insulating film, ensuring that the insulating film provides insulation between the electrode assembly and the housing. Furthermore, during the battery assembly process, the end of the base plate near the body may scratch the separator of the electrode assembly. Providing the first chamfer at the end of the base plate near the body can prevent scratching the separator, thereby avoiding internal short circuits between the electrode assemblies. This application, by providing a chamfer at the end of the base plate on the side opposite to the body and corresponding to the vent groove, can prevent the base plate near the vent groove from scratching the insulating film or separator, thereby preventing short circuits between the electrode assembly and the housing, and preventing internal short circuits in the electrode assembly. This further reduces the probability of thermal runaway and improves the safety performance when the lower plastic part is used in the end cap assembly and assembled into the battery. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the implementation will be briefly introduced below. Obviously, the drawings described below are some implementations of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the structure of an energy storage system according to another embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the structure of an energy storage system according to another embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the structure of a lower plastic part according to an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the structure of the lower plastic part according to another embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the structure of an end cap assembly according to an embodiment of this application;

[0025] Figure 7 This is an exploded view of an end cap assembly according to an embodiment of this application;

[0026] Figure 8 This is a schematic diagram of the structure of a battery according to an embodiment of this application;

[0027] Figure 9 This is a schematic diagram of the exploded structure of a battery according to an embodiment of this application;

[0028] Figure 10 for Figure 4 Enlarged view of the dashed box A in the middle;

[0029] Figure 11 for Figure 5 Enlarged view of the dashed box in section B;

[0030] Figure 12 This is a schematic diagram of the structure of the lower plastic part according to another embodiment of this application;

[0031] Figure 13 This is a top view of the lower plastic part according to an embodiment of this application;

[0032] Figure 14 for Figure 13 Enlarged view of the dashed box in the middle (C);

[0033] Figure 15 for Figure 13 Schematic diagram of the cross-sectional structure in the DD direction;

[0034] Figure 16 for Figure 15 Enlarged view of the dashed box in the middle E;

[0035] Figure 17 for Figure 5 Enlarged view of the dashed box in the middle F;

[0036] Figure 18 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application;

[0037] Figure 19 This is a circuit block diagram of an electrical device according to an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100 - Lower plastic part, 110 - Body part, 111 - Second end face, 112 - First surface, 113 - Second surface, 120 - Protrusion, 121 - Base plate, 1211 - First arc-shaped sub-part, 1212 - Base plate sub-part, 1213 - Second arc-shaped sub-part, 1214 - First arc-shaped surface, 1215 - First end face, 1216 - Second arc-shaped surface, 1217 - Third end face, 122 - First side plate, 123 - Connecting assembly, 1231 - First connecting plate, 1232 - Second connecting plate, 124 - Vent groove, 1241 - First air duct, 1242 - Second air duct, 125 - Chamfer, 1251 - First chamfer, 12 52-Second chamfer, 126-Second side plate, 130-Fence section, 131-First vent, 132-Second vent, 200-End cap assembly, 210-End cap, 211-Explosion-proof hole, 220-Explosion-proof valve, 300-Battery, 310-Housing, 311-Accommodation cavity, 320-Electrode assembly, 330-Insulating film, 400-Electrical equipment, 410-Equipment body, 500-Energy storage system, 510-First power conversion device, 520-First user load, 530-Second user load, 540-Energy storage device, 550-High voltage cable, 560-Second power conversion device, 570-Photovoltaic-storage-charging station, 580-Automobile. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0041] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0042] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. 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.

[0043] To prevent short circuits caused by direct contact between the battery cell (or bare cell, electrode assembly) and the metal casing, an insulating film (Mylar film) is usually placed between the battery cell and the metal casing. To improve the integration of the end cap assembly and the battery cell, make assembly easier, and increase structural strength, the insulating film is usually heat-fused to the edge of the lower plastic part of the end cap assembly.

[0044] Furthermore, as battery capacity increases, the amount and rate of gas generation during thermal runaway in the electrode assembly also increase. Therefore, the requirements for the battery's venting rate become more stringent. Commonly, venting channels are provided at both ends of the lower plastic component along its length. However, after the venting channels are provided, they form right angles with the edges of the lower plastic component. Specifically, the right angle formed by the venting channel opening near the edge of the lower plastic component is highly likely to scratch the Mylar membrane on the outside of the electrode assembly. Conversely, the right angle formed by the venting channel opening away from the edge of the lower plastic component is highly likely to scratch the separator in the electrode assembly during assembly. Scratching the Mylar membrane or the separator can lead to internal short circuits in the electrode assembly, thereby triggering thermal runaway and causing a series of safety issues.

[0045] Understandably, in the terminology of this application, exhaust channels are provided at both ends of the lower plastic part along the length direction, so that when the battery experiences thermal runaway, the airflow inside the battery can flow along the side wall of the casing through the exhaust channels to the space between the electrode assembly and the lower plastic part, and then through the lower plastic part to the location of the explosion-proof valve.

[0046] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form for future applications. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0047] Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak demand periods, and excessive power during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, this energy can be converted back into electrical energy and released. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0048] Taking electrochemical energy storage as an example, this solution provides an energy storage device 540, which is applied to an energy storage system 500. The energy storage device 540 is equipped with a set of chemical batteries, which mainly use the chemical elements in the battery 300 as the energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0049] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding energy storage devices (540 types) include:

[0050] (1) Large-scale energy storage power stations (including multiple prefabricated energy storage modules) applied to wind power and photovoltaic power stations can help renewable energy power generation meet grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, the energy storage power station can realize the load matching of power in time and space, enhance the renewable energy absorption capacity, reduce instantaneous power changes, reduce the impact on the power grid, improve the problem of new energy power generation absorption, and is of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0051] (2) The energy storage prefabricated cabin applied on the grid side mainly functions as peak regulation, frequency regulation and grid congestion relief. In terms of peak regulation, it can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption.

[0052] (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices 540, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system 500 when the electricity price is low and discharging the energy storage system 500 when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use the energy storage system 500 to store energy during the low electricity consumption period and discharge during the peak load period, thereby reducing peak power and the maximum demand declared, and achieving the goal of reducing capacity electricity costs. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0053] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 500 according to an embodiment of this application. Figure 1 The embodiments are illustrated using a home energy storage scenario in user-side energy storage as an example. The energy storage device 540 in this application is not limited to an energy storage box in a home energy storage scenario.

[0054] This application provides an energy storage system 500, which includes a first power conversion device 510 (photovoltaic panel), a first user load 520 (household lighting fixtures), a second user load 530 (e.g., household appliances such as air conditioners), and the energy storage device 540 of this application. The energy storage device 540 is a small energy storage box that can be wall-mounted on an outdoor wall. However, the energy storage device 540 is not limited to wall mounting and can also be placed in a user's residence in other ways. Specifically, the photovoltaic panel can convert solar energy into electrical energy during periods of low electricity prices, and the energy storage device 540 is used to store this electrical energy and supply it to lighting fixtures and household appliances during periods of high electricity prices, or to provide power during power outages / power failures.

[0055] Optionally, the first power conversion device 510 may include, but is not limited to, a photovoltaic panel, and the first power conversion device 510 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0056] In some embodiments, see Figure 2 , Figure 2 This is a schematic diagram of the structure of an energy storage system 500 according to another embodiment of this application, and this application Figure 2 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 540 in this application is not limited to a prefabricated energy storage module in a generation / distribution energy storage scenario.

[0057] This application provides an energy storage system 500, which includes: a high-voltage cable 550, a first power conversion device 510, a second power conversion device 560, and an energy storage device 540 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 560 can be a wind power conversion device. Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device 540 through grid connection. The energy storage device 540 is connected to the high-voltage cable and outputs smooth electricity to the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, wind power... The conversion device is always connected to the high-voltage cable. Under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in the energy storage device 540 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 540 together with the high-voltage cable 550 in grid-connected mode to supply power to the power consumption side. This provides the power grid with various services such as peak shaving, frequency regulation, and backup, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0058] In some embodiments on the distribution network side, the first power conversion device 510 can be a photovoltaic panel, and the energy storage device 540 is connected to the high-voltage cable 550 and installed downstream of the high-voltage cable 550 between the user load and the user load. The electrical energy output by the photovoltaic power conversion device is stored in the energy storage device 540, which can respond in a timely manner to act as a backup power source when the power grid / distribution network fails; or, it can provide power supply support to alleviate line congestion when the high-voltage cable 550 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0059] Optionally, the first power conversion device 510 may include, but is not limited to, a wind power conversion device, and the second power conversion device 560 may include, but is not limited to, a photovoltaic panel. The first power conversion device 510 and the second power conversion device 560 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0060] In some embodiments, see Figure 3 , Figure 3 This is a schematic diagram of the structure of an energy storage system 500 according to another embodiment of this application, and this application Figure 3 The embodiments are illustrated using an industrial and commercial energy storage scenario as an example. The energy storage device 540 of this application is not limited to an energy storage cabinet in an industrial and commercial energy storage scenario.

[0061] This application provides an energy storage system 500, which includes: an energy storage device 540, a high-voltage cable 550, a factory equipped with a first power conversion device 510, a photovoltaic-energy storage-charging station 570 equipped with a second power conversion device 560, and a vehicle 580. In some embodiments of industrial and commercial scenarios, the first power conversion device 510 can be a photovoltaic panel, which converts solar energy into electrical energy and stores it in the energy storage device 540 in the factory. In the event of a power grid failure, the energy storage device 540 provides power to ensure the safe and stable operation of the factory without interruption. Alternatively, when the factory's power load is high, the power grid issues an instruction to transmit the electricity stored in the energy storage device 540 in conjunction with the high-voltage cable 550 in a grid-connected mode to supply the factory with electricity, providing various services such as peak shaving / frequency regulation and backup for the power grid operation. In addition, the second power conversion device 560 can also be a photovoltaic panel, which converts solar energy into electrical energy and stores it in the energy storage device 540 of the photovoltaic-energy storage-charging station 570, directly charging the vehicle 580 through the photovoltaic-energy storage-charging station 570, which is fast and convenient.

[0062] Optionally, the first power conversion device 510 and the second power conversion device 560 may include, but are not limited to, a photovoltaic panel. The first power conversion device 510 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0063] Optionally, the energy storage device 540 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0064] Optionally, the energy storage device 540 may include, but is not limited to, single-cell batteries, or battery modules, battery packs, battery clusters, power banks, energy storage cabinets / prefabricated energy storage compartments, and other battery integrated systems composed of single-cell batteries. The actual application form of the energy storage device 540 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 540. This application embodiment only uses a multi-cell battery of the energy storage device 540 as an example for illustration.

[0065] Optionally, the individual battery cells constituting the energy storage device 540 can be, but are not limited to, at least one of cylindrical, prismatic, prismatic, or other shaped batteries.

[0066] Optionally, the energy storage device 540 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0067] Optionally, the energy storage device 540 may include battery modules, battery packs, battery clusters, mobile power supplies, energy storage cabinets / prefabricated energy storage compartments, and other battery integrated systems composed of individual batteries. The actual application form of the energy storage device 540 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 540.

[0068] Alternatively, the single cell is not limited to at least one of cylindrical, square, prismatic, or other shaped cells.

[0069] Optionally, the single cell can be a rechargeable battery, which refers to a single cell that can be recharged after discharge to activate the active materials and continue to be used. The single cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not specifically limit it.

[0070] Please see Figures 4 to 9This application provides a lower plastic part 100, which includes: a body portion 110 and a protrusion 120, the protrusion 120 being connected to the end of the body portion 110; the protrusion 120 includes a base plate 121, a first side plate 122, and a connecting assembly 123, the base plate 121, the first side plate 122, and the body portion 110 being sequentially connected, and along a first direction, the base plate 121 and the body portion 110 extending in opposite directions relative to the first side plate 122; the connecting assembly 123 is used to connect the base plate 121, the first side plate 122, and the body portion 110; the base plate 121, the first side plate 122, and the connecting assembly 123 form a venting groove 124, the venting groove 124 being along the first direction (e.g., Figure 1 (As shown in the X direction) Extends and penetrates at least part of the first side plate 122, the first direction being the length direction of the lower plastic part 100; along the first direction, the bottom plate 121 has a chamfer 125 at the end of the part opposite to the body portion 110 and corresponding to the vent groove 124.

[0071] Understandably, the lower plastic component 100 is applied to the end cap assembly 200 and assembled in the battery 300. The end cap assembly 200 also includes an end cap 210, and the lower plastic component 100 is disposed on one side of the end cap 210. The battery 300 also includes a housing 310, an electrode assembly 320, and an insulating film 330. The housing 310 has a receiving cavity 311 and is connected to the end cap assembly 200. The electrode assembly 320 and the insulating film 330 are located within the receiving cavity 311. An insulating film 330 is sleeved on the outer periphery of the electrode assembly 320 to achieve insulation between the electrode assembly 320 and the housing 310 and the end cap 210; wherein, the lower plastic part 100 is disposed closer to the electrode assembly 320 than the end cap 210, and at least a portion of the insulating film 330 is also connected to the protrusion 120 of the lower plastic part 100 to prevent the insulating film 330 from falling off the lower plastic part 100 and causing a short circuit between the electrode assembly 320 and the end cap 210.

[0072] Understandably, the base plate 121 and the body portion 110 extend in opposite directions relative to the first side plate 122, so along the first direction, the base plate 121 and the body portion 110 are located on opposite sides of the first side plate 122; along the thickness direction of the lower plastic part 100, the base plate 121 and the body portion 110 are spaced apart.

[0073] Understandably, the portion of the base plate 121 facing away from the main body 110 and corresponding to the vent groove 124 has two opposite ends in the first direction, and each of the two ends is provided with a chamfer 125. Specifically, the end closer to the main body 110 is provided with a first chamfer 1251, and the end farther away from the main body 110 is provided with a second chamfer 1252.

[0074] Understandably, the venting groove 124 extends along the first direction and penetrates at least a portion of the first side plate 122. This can be such that, along the first direction, the venting groove 124 connects the side of the protrusion 120 opposite to the body portion 110 and the side of the protrusion 120 close to the body portion 110.

[0075] Understandably, Figure 4 The embodiment shows the side of the lower plastic part 100 facing the end cap 210. Figure 5 The embodiment shows the side of the lower plastic part 100 that is away from the end cap 210.

[0076] Understandably, the chamfer 125 includes a first chamfer 1251 and a second chamfer 1252.

[0077] In this embodiment, the protrusion 120 is connected to the end of the body portion 110. The bottom plate 121, the first side plate 122, and the body portion 110 are sequentially connected. Along the first direction, the bottom plate 121 and the body portion 110 extend in opposite directions relative to the first side plate 122, so the protrusion 120 at least partially protrudes from one side of the body portion 110. When the lower plastic part 100 is applied to the end cap assembly 200 and assembled into the battery 300, the surface of the protrusion 120 facing away from the end cap 210 is closer to the electrode assembly 320 than the surface of the body portion 110 facing away from the end cap 210. This allows the protrusion 120 to be used to abut and limit the electrode assembly 320 when it expands or floats toward the end cap assembly 200. Furthermore, the connecting component 123 is used to connect the base plate 121, the first side plate 122 and the body portion 110. The base plate 121, the first side plate 122 and the connecting component 123 form a ventilation groove 124. The ventilation groove 124 extends along the first direction and penetrates at least a portion of the first side plate 122. The ventilation groove 124 can be used to connect the side of the protrusion 120 away from the body portion 110 and the side of the protrusion 120 close to the body portion 110. When the lower plastic part 100 is applied to the end cap assembly 200 and assembled into the battery 300, in the event of thermal runaway and the generation of a large amount of gas in the battery 300, the airflow can flow from the gap between the electrode assembly 320 and the housing 310 to the side of the protrusion 120 opposite to the body part 110. Furthermore, the airflow flows through the venting groove 124 to the side of the protrusion 120 opposite to the body part 110, and further converges near the explosion-proof valve 220. The venting groove 124 improves the venting efficiency of the battery 300, allowing the explosion-proof valve 220 to release pressure in a timely manner, thus improving the safety performance of the battery 300. In addition, at least a portion of the insulating film 330 is connected to the protrusion 120; specifically, the insulating film 330 is connected to the side of the protrusion 120 opposite to the body part 110. Along the first direction, the bottom plate 121 is provided with a chamfer 125 at the end of the part opposite to the main body 110 and corresponding to the vent groove 124. More specifically, the bottom plate 121 is provided with a second chamfer 1252 at the end away from the main body 110. The second chamfer 1252 can avoid directly cutting the insulating film 330, so as to ensure that the insulating film 330 plays an insulating role between the electrode assembly 320 and the housing 310.Furthermore, during the assembly of the battery 300, the end of the base plate 121 near the body portion 110 may scratch the diaphragm of the electrode assembly 320. Providing the first chamfer 1251 at the end of the base plate 121 near the body portion 110 can prevent scratching the diaphragm, thereby avoiding internal short circuits between the electrode assemblies 320. In this embodiment, by providing a chamfer 125 at the end of the base plate 121 on the side opposite to the body portion 110 and corresponding to the vent groove 124, the base plate 121 near the vent groove 124 can avoid scratching the insulating film 330 or the diaphragm, thereby preventing short circuits between the electrode assembly 320 and the housing 310, and preventing internal short circuits in the electrode assembly 320. This further reduces the probability of thermal runaway and improves the safety performance of the lower plastic part 100 when applied to the end cap assembly 200 and assembled into the battery 300.

[0078] Optionally, in some embodiments, there are two protrusions 120, and the two protrusions 120 are respectively connected to opposite ends of the body portion 110 along the first direction. The two protrusions 120 cooperate with each other to support the body portion 110.

[0079] Please see also Figure 10 In some embodiments, the connecting assembly 123 includes a first connecting plate 1231 and a second connecting plate 1232. Both the first connecting plate 1231 and the second connecting plate 1232 are disposed on the surface of the base plate 121 facing the body portion 110 and located on the side of the first side plate 122 opposite to the body portion 110, along a second direction (e.g., Figure 4 On the Y-direction (as shown), the first connecting plate 1231 and the second connecting plate 1232 are spaced apart, and both the first connecting plate 1231 and the second connecting plate 1232 extend along the first direction; the bottom plate 121, the first side plate 122, the first connecting plate 1231 and the second connecting plate 1232 form a ventilation groove 124, and the ventilation groove 124 at least partially penetrates the first side plate 122, wherein the second direction is the width direction of the lower plastic part 100, and the second direction intersects with the first direction.

[0080] Understandably, the first connecting plate 1231 and the second connecting plate 1232 are arranged opposite to each other along the second direction.

[0081] Optionally, in some embodiments, the second direction is perpendicular to the first direction.

[0082] It should be noted that the dimension of the lower plastic part 100 along the length direction is larger than the dimension of the lower plastic part 100 along the width direction.

[0083] In this embodiment, the first connecting plate 1231 and the second connecting plate 1232 are spaced apart along the second direction, and both the first connecting plate 1231 and the second connecting plate 1232 are arranged along the first direction. A gas flow channel is formed between the first connecting plate 1231 and the second connecting plate 1232. The first connecting plate 1231 and the second connecting plate 1232 form the inner sidewall of the venting groove 124 to guide the gas to flow along the first direction and improve the exhaust efficiency of the lower plastic part 100.

[0084] Understandably, the two opposite ends of the venting groove 124 have a first air duct 1241 and a second air duct 1242, respectively, with the first air duct 1241 being closer to the body portion 110 than the second air duct 1242. Specifically, the first chamfer 1251 is provided corresponding to the first air duct 1241, and the second chamfer 1252 is provided corresponding to the second air duct 1242. In this embodiment, airflow enters the venting groove 124 from the second air duct 1242 and flows out of the venting groove 124 from the first air duct 1241, so that the airflow flows to the middle portion of the lower plastic part 100, allowing the airflow to approach and impact the explosion-proof valve 220.

[0085] Please see also Figure 11 In some embodiments, along a third direction (e.g.) Figure 4 In the Z-direction (as shown), the body portion 110 has a first surface 112 and a second surface 113 disposed opposite to each other. The first surface 112 is disposed closer to the base plate 121 than the second surface 113. The base plate 121 includes a first arc-shaped sub-part 1211, a base plate sub-part 1212, and a second arc-shaped sub-part 1213 connected in sequence. In the third direction, the end face of the first arc-shaped sub-part 1211 facing the first surface 112 is closer to the first surface 112 than the end face of the base plate sub-part 1212 facing the first surface 112. The end face of the second arc-shaped sub-part 1213 facing the first surface 112 is... The end face is closer to the first surface 112 than the end face of the base plate sub-part 1212 facing the first surface 112. Along the first direction, the second arc-shaped sub-part 1213, the base plate sub-part 1212, and the first arc-shaped sub-part 1211 are arranged in sequence. The first arc-shaped sub-part 1211 has a first chamfer 1251 on the side away from the body part 110, and the second arc-shaped sub-part 1213 has a second chamfer 1252 on the side away from the body part 110. The third direction is the height direction of the lower plastic part 100, and the first direction, the second direction, and the third direction intersect each other in pairs.

[0086] Understandably, when the lower plastic part 100 is applied to the end cap assembly 200, the first surface 112 is disposed away from the end cap 210, and the second surface is disposed facing the end cap 210.

[0087] Understandably, the first arc-shaped sub-part 1211, the first connecting plate 1231, the main body 110, and the second connecting plate 1232 enclose to form the first airway opening 1241; the first connecting plate 1231, the second arc-shaped sub-part 1213, and the second connecting plate 1232 enclose to form the second airway opening 1242.

[0088] Understandably, the base plate sub-section 1212 is a straight plate structure.

[0089] Understandably, along the third direction upward, the height of the first arc-shaped sub-part 1211 is greater than the height of the base plate sub-part 1212, and the height of the second arc-shaped sub-part 1213 is greater than the height of the base plate sub-part 1212.

[0090] Optionally, in some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other.

[0091] In the base plate 121 provided in this embodiment, the second arc-shaped sub-part 1213, the base plate sub-part 1212, and the first arc-shaped sub-part 1211 are arranged sequentially and connected along the first direction. The first arc-shaped sub-part 1211 has a first chamfer 1251 on the side away from the main body 110. When the lower plastic part 100 is applied to the end cap assembly 200 and assembled into the battery 300, the first arc-shaped sub-part 1211 may directly contact the electrode assembly 320. Compared with the scheme of setting the side of the first arc-shaped sub-part away from the main body 110 to be a right angle structure, the first chamfer 1251 of this embodiment can change the contact between the base plate 121 and the electrode assembly 320 from "point contact" or "line contact" to "surface contact" to reduce the mechanical stress per unit area. This can prevent the base plate 121 from scratching the diaphragm of the electrode assembly 320 during assembly, thereby avoiding internal short circuits in the electrode assembly 320 and improving the safety performance of the battery 300. Similarly, if the second arc-shaped sub-part 1213 has a second chamfer 1252 on the side opposite to the main body 110, then when the lower plastic part 100 is applied to the end cap assembly 200 and assembled into the battery 300, at least a portion of the insulating film 330 is connected to the second arc-shaped sub-part 1213. The second arc-shaped sub-part 1213 is equivalent to providing a "reinforcing plate structure" at one end of the base plate sub-part 1212, which facilitates the formation of the second chamfer 1252. This results in a larger contact area and a sufficiently large curvature of the contact surface when the insulating film 330 is connected to the base plate 121, greatly reducing the probability that the base plate 121 will tear the insulating film 330. If the second arc-shaped sub-part 1213 is not provided, the base plate sub-part 1212 will be directly connected to the insulating film 330, and the right-angled edge of the base plate sub-part 1212 may directly tear the insulating film 330. Furthermore, along the third direction, the end face of the first arc-shaped sub-part 1211 facing the first surface 112 is closer to the first surface 112 than the end face of the base plate sub-part 1212 facing the first surface 112, and the end face of the second arc-shaped sub-part 1213 facing the first surface 112 is closer to the first surface 112 than the end face of the base plate sub-part 1212 facing the first surface 112. The base plate 121 is not a flat plate structure; both the first arc-shaped sub-part 1211 and the second arc-shaped sub-part 1213 protrude at least partially from the body part 110. If rounded corners are directly provided at opposite ends of the base plate sub-part 1212 along the first direction, the thickness of the base plate sub-part 1212 is relatively thin due to the limitations of the thickness of the lower plastic part 100 itself and the dimensions of the vent groove 124 along the height direction of the lower plastic part 100, resulting in poor actual effect of providing rounded corners at its ends.In this embodiment of the application, by setting the first arc-shaped sub-part 1211 and the second arc-shaped sub-part 1213, it is easier to form the first chamfer 1251 and the second chamfer 1252 with larger arc radii, which has a more obvious effect on avoiding scratches on the insulating film 330 and the separator, thereby enabling the battery 300 to have higher safety performance.

[0092] Please see also Figures 12 to 14 In some embodiments, the first arc-shaped sub-part 1211 has a first arc-shaped surface 1214 and a first end face 1215 that are bent and connected together. The first arc-shaped surface 1214 is disposed facing the vent groove 124, and the first end face 1215 is disposed facing the extension surface of the second surface 113. One end of the first end face 1215 away from the first arc-shaped surface 1214 is connected to the base plate sub-part 1212; the body part 110 has a second end face 111 facing the vent groove 124; along a third direction, the boundary line between the first arc-shaped surface 1214 and the first end face 1215 (e.g., Figure 14 The orthographic projection of the second end face 111 of the body part 110 (as shown in L) on the body part 110 is offset from the orthographic projection of the second end face 111 of the body part 110 on the body part 110.

[0093] Understandably, the first arc-shaped surface 1214 and the first end face 1215 form the bottom wall of the ventilation groove 124, and the first arc-shaped surface 1214 and the first end face 1215 are connected in sequence along the first direction.

[0094] Understandably, the height direction of the lower plastic part 100 is parallel to the height direction of the battery 300.

[0095] Understandably, the first end face 1215 and the second end face 111 are located close to the first airway opening 1241.

[0096] Understandably, the boundary line between the first arcuate surface 1214 and the first end surface 1215 is outside the plane containing the second end surface 111.

[0097] In this embodiment, along the first direction, the first arc-shaped surface 1214 and the first end face 1215 are sequentially connected. When airflow enters the venting groove 124 from the side of the protrusion 120 away from the body portion 110, the airflow passes through the first arc-shaped surface 1214 and the first end face 1215. The first arc-shaped surface 1214 can guide the airflow to improve the efficiency of airflow out of the venting groove 124, thereby improving the exhaust efficiency of the battery 300 when the lower plastic part 100 is applied to the battery 300. Further, along the third direction, the orthographic projection of the intersection line of the first arc-shaped surface 1214 and the first end face 1215 on the body portion 110 is offset from the orthographic projection of the second end face 111 of the body portion 110 on the body portion 110. In other words, along the third direction, the intersection line of the first arc-shaped surface 1214 and the first end face 1215 and the second end face 111 are not on the same plane. During the manufacturing process of the lower plastic part 100, even if the mold is worn, the intersection line of the first arc-shaped surface 1214 and the first end surface 1215 is offset from the second end surface 111 in the third direction, which can avoid the generation of burrs and flash, thereby preventing burrs and flash from blocking the first air passage 1241, ensuring the unobstructed flow of the air groove 124, and thus improving the performance of the lower plastic part 100.

[0098] In the terminology of this application, "burr structure" refers to burrs or flash, which are excess, irregular protrusions of metal or plastic material formed on the surface of a part during the part processing due to the effects of cutting, stamping, casting, injection molding, and other processes.

[0099] In some embodiments, the base plate 121 includes a first arc-shaped sub-part 1211, a base plate sub-part 1212, and a second arc-shaped sub-part 1213 connected in sequence. Along the first direction, the second arc-shaped sub-part 1213, the base plate sub-part 1212, and the first arc-shaped sub-part 1211 are arranged sequentially. The first arc-shaped sub-part 1211 has a first arc-shaped surface 1214 and a first end face 1215 that are bent and connected. The first arc-shaped surface 1214 faces the vent groove 124, and the first end face 1215 faces the extension surface of the second surface 113. The second surface 113 is a surface of the body portion 110 disposed further away from the base plate 121 along a third direction, the third direction intersecting the first direction; the body portion 110 has a second end face 111 facing the vent groove 124; along the third direction, the distance between the orthographic projection of the boundary line of the first arcuate surface 1214 and the first end face 1215 on the body portion 110 and the orthographic projection of the second end face 111 on the body portion 110 is h, then h satisfies the range: 0.1mm≤h≤0.35mm.

[0100] Specifically, the value of h can be, but is not limited to, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, and 0.35mm.

[0101] In this embodiment, when the value of h satisfies the range of 0.1mm≤h≤0.35mm, the distance between the boundary line of the first arc-shaped surface 1214 and the first end face 1215 and the second end face 111 is within a reasonable range. On the one hand, since the boundary line of the first arc-shaped surface 1214 and the first end face 1215 is outside the second end face 111, during the injection molding process of the lower plastic part 100, the injection molding material can be prevented from flowing between the boundary line of the first arc-shaped surface 1214 and the first end face 1215 and the second end face 111 to form a burr structure, thereby ensuring the unobstructed flow of the ventilation groove 124 and facilitating airflow. The lower plastic part 100 has good exhaust efficiency. On the other hand, this avoids the airflow flowing along the first direction and the airflow flowing along the third direction from interfering with each other at the position of the venting groove 124 near the first air inlet 1241, thereby improving the efficiency of the airflow flowing through the venting groove 124 to the position near the explosion-proof valve 220, and giving the lower plastic part 100 better exhaust efficiency. When the value of h is too large, the distance between the boundary line of the first arc-shaped surface 1214 and the first end face 1215 and the second end face 111 is too large. When the airflow passes through the venting groove 124, the airflow along the first direction and the airflow along the third direction will interfere with each other, affecting the efficiency of the airflow flowing through the venting groove 124 to the position near the explosion-proof valve 220, resulting in poor exhaust effect of the lower plastic part 100. When the value of h is too small, the boundary line between the first arc-shaped surface 1214 and the first end face 1215 and the second end face 111 are close to each other and almost on the same plane. During the injection molding process of the lower plastic part 100, a burr structure is easily formed at the first air passage 1241 of the venting groove 124, which blocks the venting groove 124, affecting the exhaust efficiency of the lower plastic part 100 and reducing the product yield of the lower plastic part 100.

[0102] Please see also Figure 15 and Figure 16 In some embodiments, along the third direction, the orthographic projection of the end of the first end face 1215 away from the first arcuate surface 1214 on the body portion 110 is offset from the orthographic projection of the second end face 111 on the body portion 110.

[0103] Understandably, along the first direction, the end of the first end face 1215 that is away from the first arcuate surface 1214 is offset from the second end face 111; along the third direction, the end of the first end face 1215 that is away from the first arcuate surface 1214 is not in the same plane as the second end face 111.

[0104] Understandably, the end of the first end face 1215 that is away from the first arcuate surface 1214 is outside the plane where the second end face 111 is located.

[0105] In this embodiment, the orthographic projection of the end of the first end face 1215 away from the first arcuate surface 1214 on the body portion 110 is offset from the orthographic projection of the second end face 111 on the body portion 110. In other words, along the third direction, the end of the first end face 1215 away from the first arcuate surface 1214 and the second end face 111 are not on the same plane. During the manufacturing process of the lower plastic part 100, even if the mold is worn, the offset arrangement of the end of the first end face 1215 away from the first arcuate surface 1214 and the second end face 111 in the third direction can prevent the generation of burrs, thereby preventing burrs and flash from clogging the first air duct 1241, ensuring the unobstructed flow of the vent groove 124, and thus improving the performance of the lower plastic part 100.

[0106] In some embodiments, the lower plastic part 100 satisfies at least one of the following conditions: the orthographic projection of the end of the first end face 1215 away from the first arcuate surface 1214 on the body portion 110 is further away from the second arcuate sub-part 1213 than the orthographic projection of the second end face 111 on the body portion 110; the orthographic projection of the end of the first end face 1215 away from the first arcuate surface 1214 on the body portion 110 is closer to the second arcuate sub-part 1213 than the orthographic projection of the second end face 111 on the body portion 110.

[0107] Understandably, when the orthographic projection of the end of the first end face 1215 away from the first arcuate surface 1214 on the body portion 110 is further away from the second arcuate sub-part 1213 than the orthographic projection of the second end face 111 on the body portion 110, the orthographic projection of the end of the first end face 1215 away from the first arcuate surface 1214 on the body portion 110 coincides with the body portion 110.

[0108] Understandably, when the orthographic projection of the end of the first end face 1215 away from the first arcuate surface 1214 on the body portion 110 is closer to the second arcuate sub-portion 1213 than the orthographic projection of the second end face 111 on the body portion 110, the orthographic projection of the end of the first end face 1215 away from the first arcuate surface 1214 on the body portion 110 is spaced apart from the body portion 110.

[0109] In this embodiment, by adjusting the relative position of the end of the first end face 1215 that is away from the first arc-shaped surface 1214 and the second end face 111, the end of the first end face 1215 that is away from the first arc-shaped surface 1214 and the second end face 111 are staggered along the first direction. This avoids the generation of burrs during the injection molding process of the lower plastic part 100, further prevents burrs and flash from blocking the first air passage 1241, ensures the unobstructed flow of the vent groove 124, and ultimately enables the lower plastic part 100 to have better performance.

[0110] In some embodiments, the protrusion 120 further includes a second side plate 126 extending upward along the third direction. The second side plate 126 and the first side plate 122 are located on the same side of the base plate 121. The second side plate 126 is connected to the end of the base plate 121 away from the first side plate 122. The ventilation groove 124 also penetrates the second side plate 126.

[0111] Understandably, along the first direction, the second side plate 126 is spaced apart from the first side plate 122.

[0112] In this embodiment, the second side plate 126 and the first side plate 122 are respectively connected to the base plate 121 and located on the same side of the base plate 121 along the third direction. The two opposite ends of the ventilation groove 124 pass through the first side plate 122 and the second side plate 126 respectively to form a first air duct 1241 and a second air duct 1242. The first air duct 1241 is disposed close to the first side plate 122, and the second air duct 1242 is disposed close to the second side plate 126. When the lower plastic part 100 is applied to the end cap assembly 200 and assembled on the battery 300, the airflow converges between the electrode assembly 320 and the housing 310, and flows along the third direction to the side of the protrusion 120 away from the body part 110. The airflow enters the ventilation groove 124 from the second air port 1242 of the ventilation groove 124, and after being discharged from the first air port 1241, it converges near the explosion-proof valve 220. The lower plastic part 100 has a high exhaust efficiency.

[0113] In some embodiments, the second arcuate sub-part 1213 has a second arcuate surface 1216 and a third end surface 1217 that are bent and connected together. The second arcuate surface 1216 and the third end surface 1217 are disposed facing the vent groove 124. One end of the second arcuate surface 1216 facing away from the third end surface 1217 is connected to the base plate sub-part 1212. Along the third direction, the third end surface 1217 is closer to the body part 110 than the surface of the base plate sub-part 1212 facing the first surface 112.

[0114] Understandably, the third end face 1217, the second arcuate surface 1216, the surface of the bottom plate sub-part 1212 facing the first surface 112, the first arcuate surface 1214 and the first end face 1215 are sequentially connected along the first direction to form the bottom wall of the ventilation groove 124.

[0115] Understandably, the second arcuate surface 1216 and the third end surface 1217 are positioned close to the second airway opening 1242.

[0116] Understandably, along the third direction, the third end face 1217 is closer to the body portion 110 than the surface of the base plate portion 1212 facing the first surface 112. This can be because the distance between the third end face 1217 and the first surface 112 in the third direction is less than the distance between the surface of the body portion 110 facing the body portion 110 and the first surface 112 in the third direction.

[0117] In this embodiment, along the first direction, the third end face 1217, the second arc-shaped surface 1216, the surface of the bottom plate sub-part 1212 facing the first surface 112, the first arc-shaped surface 1214, and the first end face 1215 are sequentially connected along the first direction. When the airflow enters the venting groove 124 from the end of the protrusion 120 away from the body part 110, the second arc-shaped surface 1216 can be used to guide the airflow into the venting groove 124, and the first arc-shaped surface 1214 can be used to guide the airflow out of the venting groove 124, thereby improving the efficiency of airflow in and out of the venting groove 124, and thus improving the exhaust efficiency of the battery 300 when the lower plastic part 100 is applied to the battery 300. Furthermore, along the third direction upward, the third end face 1217 is closer to the body portion 110 than the surface of the bottom plate sub-part 1212 facing the first surface 112. Then, the second arc-shaped sub-part 1213 serves as a "reinforcing plate structure" and a "connecting plate structure" for the bottom plate sub-part 1212, so as to form a chamfer 125 with a larger arc radius between the bottom plate sub-part 1212 and the second side plate 126. When the insulating film 330 is connected to the side of the protrusion 120 away from the body portion 110, specifically, the insulating film 330 is connected to the side of the second side plate 126 away from the first side plate 122. The second arc-shaped sub-part 1213 has the second arc-shaped surface 1216 and the third end surface 1217, and the second arc-shaped sub-part 1213 has the second chamfer 1252, which can prevent the insulating film 330 from being scratched, so that the insulating film 330 can fully play its role in blocking the electrode assembly 320 and the housing 310, avoiding thermal runaway caused by short circuit connection between the electrode assembly 320 and the housing 310, and improving the safety performance of the battery 300.

[0118] Please see also Figures 4 to 16 This application provides an end cap assembly 200, which includes an end cap 210 and a lower plastic part 100 provided in this application, wherein the lower plastic part 100 is disposed on one side of the end cap 210.

[0119] Understandably, the end cap 210 and the lower plastic part 100 are arranged sequentially along the thickness direction of the end cap assembly 200.

[0120] In this embodiment, the end cap assembly 200 includes the lower plastic part 100 provided in this application. Along the first direction, the end of the bottom plate 121 opposite to the body part 110 and corresponding to the vent groove 124 is provided with a chamfer 125. Specifically, the end of the bottom plate 121 away from the body part 110 is provided with a second chamfer 1252. The second chamfer 1252 can prevent directly scratching the insulating film 330, so as to ensure that the insulating film 330 plays an insulating role between the electrode assembly 320 and the housing 310. Furthermore, during the process of assembling the end cap assembly 200 into the battery 300, the end of the bottom plate 121 near the body part 110 may scratch the diaphragm of the electrode assembly 320. Providing the first chamfer 1251 at the end of the bottom plate 121 near the body part 110 can prevent scratching the diaphragm, thereby avoiding internal short circuits between the electrode assemblies 320. When the end cap assembly 200 is applied to the battery 300, the battery 300 has high safety performance.

[0121] Optionally, please also see Figure 17 In some embodiments, the end cap 210 has an explosion-proof hole 211 that penetrates two opposing surfaces of the end cap 210 along its thickness direction; the end cap assembly 200 further includes an explosion-proof valve 220 that is mounted on the end cap 210 and covers the explosion-proof hole 211; the lower plastic part 100 further includes a fence portion 130 that protrudes from the side of the body portion 110 away from the end cap 210 and is disposed corresponding to the explosion-proof valve 220, the fence portion 130 having a first vent 131 and a second vent 132, the first vent 131 penetrating the bottom wall of the fence portion 130 and the second vent 132 penetrating the side wall of the fence portion 130.

[0122] Understandably, the explosion-proof valve 220 has weak points, such as grooves.

[0123] In this embodiment, when the end cap assembly 200 is applied to the battery 300 and the battery 300 experiences thermal runaway, along the first direction, a portion of the airflow first gathers in the gap between the electrode assembly 320 and the housing 310, then flows to the side of the protrusion 120 away from the body portion 110, and flows through the vent groove 124 to the space between the lower plastic part 100 and the electrode assembly 320. The airflow can enter the grid portion 130 through the second vent 132 and impact the explosion-proof valve 220, causing the explosion-proof valve 220 to open. Along the third direction, a portion of the airflow flows directly to the side of the grid portion 130 away from the body portion 110 and enters the grid portion 130 through the first vent 131, impacting the explosion-proof valve 220 and causing the explosion-proof valve 220 to release pressure and open in time. When the end cap assembly 200 is applied to the battery 300, the battery 300 has good safety performance.

[0124] Please see also Figures 4 to 17 This application provides a battery 300, which includes: an end cap assembly 200, a housing 310, an electrode assembly 320, and an insulating film 330. The housing 310 is disposed on one side of the end cap assembly 200 and connected to the end cap assembly 200, and the housing 310 has a receiving cavity 311. The electrode assembly 320 is disposed inside the housing 310 and is electrically connected to the end cap assembly 200. The insulating film 330 is sleeved on the outer periphery of the electrode assembly 320 to achieve insulation between the electrode assembly 320 and the housing 310, and at least a portion of the insulating film 330 is also connected to the protrusion 120.

[0125] Optionally, the electrode assembly 320 includes a positive electrode, a separator, and a negative electrode, with the separator located between the positive electrode and the negative electrode to prevent a short circuit between the positive electrode and the negative electrode.

[0126] Understandably, the end cap assembly 200 and the electrode assembly 320 are arranged sequentially along the height direction of the battery 300.

[0127] Understandably, the height direction of the battery 300 is parallel to the thickness direction of the end cap assembly 200.

[0128] Understandably, the electrolyte is disposed within the accommodating cavity 311.

[0129] Optionally, the insulating film 330 is a Mylar film.

[0130] In this embodiment, the end cap assembly 200 is connected to the housing 310, so that the accommodating cavity 311 forms a closed chamber, facilitating the placement of the electrode assembly 320 and the electrolyte. When the battery 300 experiences thermal runaway, the electrode assembly 320 generates a large amount of gas. The gas flow flows from the gap between the electrode assembly 320 and the housing 310 to the side of the protrusion 120 opposite to the body portion 110, and then flows through the vent groove 124 to the vicinity of the explosion-proof valve 220. The lower plastic part 100 has high exhaust efficiency, facilitating timely pressure relief by the explosion-proof valve 220, thereby giving the battery 300 high safety performance. Furthermore, along the first direction, the end of the base plate 121 opposite to the body portion 110 and corresponding to the vent groove 124 is provided with a chamfer 125. Specifically, the end of the base plate 121 away from the body portion 110 is provided with a second chamfer 1252. The second chamfer 1252 can prevent direct damage to the insulating film 330, thus ensuring that the insulating film 330 plays an insulating role between the electrode assembly 320 and the housing 310. Furthermore, during the assembly of the battery 300, the end of the base plate 121 near the body portion 110 may damage the separator of the electrode assembly 320. Providing the first chamfer 1251 at the end of the base plate 121 near the body portion 110 can prevent damage to the separator, thereby avoiding internal short circuits between the electrode assemblies 320. The battery 300 has high safety performance.

[0131] Optionally, the battery 300 is a square battery or the like.

[0132] Optionally, the battery 300 may be, but is not limited to, a lithium-ion battery, a sodium-ion battery, etc.

[0133] Please see Figure 18 and Figure 19 This application provides an electrical device 400, which includes a device body 410 and a battery 300 provided in this application, wherein the battery 300 supplies power to the device body 410.

[0134] Understandably, the battery 300 is electrically connected to the electrical device 400.

[0135] In this embodiment, the battery 300 includes the end cap assembly 200 provided in this application. The end cap assembly 200 includes the lower plastic part 100 provided in this application. Along the first direction, the bottom plate 121 of the lower plastic part 100 is provided with a chamfer 125 at the end of the part opposite to the main body 110 and corresponding to the vent groove 124, so as to avoid scratching the separator and / or insulating film 330, so as to ensure that the insulating film 330 plays an insulating role between the electrode assembly 320 and the housing 310, and to ensure that the separator plays an insulating role between the positive electrode and the negative electrode, thereby avoiding thermal runaway due to internal short circuit of the battery 300. The battery 300 has better safety performance, so that the battery 300 can provide stable power to the device body 410 and improve the user experience.

[0136] Optionally, the electrical device 400 in this application embodiment can be, but is not limited to, portable electronic devices such as mobile phones, tablets, laptops, desktop computers, smart bracelets, smartwatches, e-readers, and game consoles. It can also be a vehicle such as a car, truck, sedan, van, freight train, high-speed train, or electric vehicle. Furthermore, it can be various household appliances. Figure 18 The electrical equipment 400 in this embodiment is an energy storage battery cabinet.

[0137] It is understood that the electrical device 400 described in this embodiment is merely one form of the electrical device 400 used by the battery 300, and should not be construed as a limitation on the electrical device 400 provided in this application, nor should it be construed as a limitation on the electrical device 400 provided in various embodiments of this application.

[0138] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A lower plastic part, characterized in that, The lower plastic component includes: Body part; and A protrusion is provided, which connects to the end of the body portion. The protrusion includes a base plate, a first side plate, and a connecting assembly. The base plate, the first side plate, and the body portion are sequentially connected. Along a first direction, the base plate and the body portion extend in opposite directions relative to the first side plate. The connecting assembly connects the base plate, the first side plate, and the body portion. The base plate, the first side plate, and the connecting assembly form a venting groove, which extends along a first direction and penetrates at least a portion of the first side plate. The first direction is the length direction of the lower plastic part. Along the first direction, the end of the bottom plate opposite to the main body and corresponding to the vent groove is provided with a chamfer; Along a third direction, the main body has a first surface and a second surface disposed opposite to each other, with the first surface being closer to the base plate than the second surface; the base plate includes a first arc-shaped sub-part, a base plate sub-part, and a second arc-shaped sub-part connected in sequence, with the end face of the first arc-shaped sub-part facing the first surface being closer to the first surface than the end face of the base plate sub-part facing the first surface, and the end face of the second arc-shaped sub-part facing the first surface being closer to the first surface than the end face of the base plate sub-part facing the first surface; along the first direction, the second arc-shaped sub-part, the base plate sub-part, and the first arc-shaped sub-part are arranged in sequence, wherein the third direction is the height direction of the lower plastic part, and the first direction and the third direction intersect; The chamfer includes a first chamfer and a second chamfer. The first chamfer is provided on the side of the first arc-shaped sub-part that is away from the main body, and the second chamfer is provided on the side of the second arc-shaped sub-part that is away from the main body. The first arc-shaped sub-part has a first arc-shaped surface and a first end face that are bent and connected. The first arc-shaped surface faces the vent groove, and the first end face faces the extension surface of the second surface. The end of the first end face that is away from the first arc-shaped surface is connected to the base plate sub-part. The main body has a second end face that faces the vent groove. Along the third direction, the orthographic projection of the boundary line between the first arcuate surface and the first end face on the main body is offset from the orthographic projection of the second end face of the main body on the main body.

2. The lower plastic part according to claim 1, characterized in that, The connecting assembly includes a first connecting plate and a second connecting plate. Both the first connecting plate and the second connecting plate are disposed on the surface of the base plate facing the body portion and located on the side of the first side plate away from the body portion. Along a second direction, the first connecting plate and the second connecting plate are spaced apart and both extend along the first direction. The base plate, the first side plate, the first connecting plate, and the second connecting plate form a ventilation groove, which at least partially penetrates the first side plate. The second direction is the width direction of the lower plastic part, and the second direction intersects with the first direction.

3. The lower plastic part according to claim 1, characterized in that, The base plate includes a first arc-shaped sub-part, a base plate sub-part, and a second arc-shaped sub-part connected in sequence. Along the first direction, the second arc-shaped sub-part, the base plate sub-part, and the first arc-shaped sub-part are arranged sequentially. The first arc-shaped sub-part has a first arc-shaped surface and a first end face that are bent and connected. The first arc-shaped surface faces the vent groove, and the first end face faces an extension of a second surface. The second surface is a surface of the body portion that is further away from the base plate along a third direction, which intersects with the first direction. The body portion has a second end face facing the vent groove. Along the third direction, the distance between the orthographic projection of the boundary line between the first arcuate surface and the first end face on the main body and the orthographic projection of the second end face of the main body on the main body is h, and h satisfies the range: 0.1mm≤h≤0.35mm.

4. The lower plastic part according to claim 1, characterized in that, Along the third direction upward, the orthographic projection of the end of the first end face away from the first arc-shaped surface on the body portion is offset from the orthographic projection of the second end face on the body portion.

5. The lower plastic part according to claim 4, characterized in that, The lower plastic part meets at least one of the following conditions: The orthographic projection of the end of the first end face that is away from the first arc-shaped surface on the main body is further away from the second arc-shaped sub-part than the orthographic projection of the second end face on the main body. The orthographic projection of the end of the first end face that is away from the first arc-shaped surface on the main body is closer to the second arc-shaped sub-part than the orthographic projection of the second end face on the main body.

6. The lower plastic part according to claim 1, characterized in that, The protrusion also includes a second side plate extending upward along the third side. The second side plate and the first side plate are located on the same side of the base plate. The second side plate is connected to the end of the base plate away from the first side plate. The ventilation groove also penetrates the second side plate.

7. The lower plastic part according to claim 5, characterized in that, The second arc-shaped sub-part has a second arc-shaped surface and a third end face that are bent and connected. The second arc-shaped surface and the third end face are disposed facing the ventilation groove. The end of the second arc-shaped surface that is away from the third end face is connected to the bottom plate sub-part. Along the third direction upwards, the third end face is closer to the body portion than the surface of the base plate portion facing the first surface.

8. An end cap assembly, characterized in that, The end cap assembly includes: End caps; and The lower plastic part according to any one of claims 1 to 7, wherein the lower plastic part is disposed on one side of the end cap.

9. A battery, characterized in that, The battery includes: The end cap assembly as described in claim 8; A housing, the housing being disposed on one side of the end cap assembly and connected to the end cap assembly, the housing having a receiving cavity; Electrode assembly, wherein the electrode assembly is disposed within the housing and is electrically connected to the end cap assembly; and An insulating film is fitted around the outer periphery of the electrode assembly to achieve insulation between the electrode assembly and the housing. At least a portion of the insulating film is also connected to the protrusion.

10. An electrical appliance, characterized in that, The electrical equipment includes: The equipment itself; and The battery of claim 9, wherein the battery supplies power to the device body.

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