Batteries and power-consuming devices

Abstract

The embodiment of the present application discloses a battery and a power consuming device. The battery includes a battery cell having a pressure relief mechanism on a first wall thereof, and a protective plate, which is a polymer matrix composite fiberboard, facing the pressure relief mechanism. The technical solution of the present application can protect the battery case from airflow impact and high temperature melting caused by thermal runaway of the battery, and improve the safety performance of the battery.

Description

[Technical Field]

[0001] This application claims priority from Chinese Patent Application No. 202210423355.6, filed on April 21, 2022, entitled "Battery and Power Consumption Device," the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of battery technology, and more particularly to batteries and power consuming devices. [Background technology]

[0003] Energy conservation and emission reduction are key to sustainability in the automotive industry. In this context, electric vehicles are a key component of vehicle sustainability due to their energy-saving and environmental benefits. For electric vehicles, battery technology is a key factor in their development.

[0004] In the development of battery technology, in addition to improving battery performance, safety is also an issue that cannot be ignored. If the safety of a battery cannot be guaranteed, the battery cannot be used. Therefore, how to improve battery safety is an urgent issue that needs to be solved in battery technology. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above problems, the embodiments of the present application provide a battery and a power consuming device that can protect the battery casing from airflow impact and high-temperature melting that occurs during thermal runaway of the battery, thereby improving the safety performance of the battery. [Means for solving the problem]

[0006] According to a first aspect, there is provided a battery including a battery cell having a pressure relief mechanism on a first wall thereof, and a protective plate that is a polymer matrix composite fiberboard and is disposed opposite the pressure relief mechanism.

[0007] In one embodiment of the present application, the battery includes a battery cell having a pressure relief mechanism on a first wall for protecting the battery cell, and the battery further includes a protective plate facing the pressure relief mechanism, i.e., the protective plate directly faces the pressure relief mechanism. The protective plate is a polymer matrix composite fiberboard and is resistant to high temperatures and impacts. By placing the pressure relief mechanism opposite the protective plate, in the event of thermal runaway of the battery cell, the polymer matrix composite fiberboard protective plate can block the high-temperature, high-velocity gas-solid mixture released from the pressure relief mechanism, protecting the battery casing from airflow impact and high-temperature melting, and ensuring the safety of the battery.

[0008] In one possible embodiment, the polymer matrix composite fiberboard is a fiber reinforced resin composite board.

[0009] In the examples of the present application, a fiber-reinforced resin composite plate is manufactured as a protective plate using a polymeric resin as the matrix, and the fiber-reinforced resin composite plate has superior high temperature resistance and impact resistance compared to other polymeric matrix materials.

[0010] In one possible embodiment, the battery cell is housed in a housing, and the first wall is a wall that is close to a top cover of the housing of the battery cell and that faces the top cover.

[0011] In the embodiment of the present application, when the first wall is a wall located near the top cover of the battery cell housing and facing the top cover, the pressure relief mechanism faces the top cover. The protective plate is located opposite the pressure relief mechanism, i.e., the protective plate is located near the top cover. In the event of thermal runaway of the battery cell, the protective plate, which is made of polymer matrix composite fiber, can block the high-temperature and high-velocity gas-solid mixture released from the pressure relief mechanism and protect the battery top cover from airflow impact and high-temperature melting.

[0012] In one possible embodiment, the protection plate is integrally provided on the top cover.

[0013] In the embodiment of the present application, the protective plate is integrally provided on the top cover. The protective plate may function together with the top cover as the battery top cover, or the protective plate may function independently as the battery top cover. When the protective plate functions together with the top cover as the battery top cover, the protective plate protects the top cover and better protects the battery. When the protective plate functions independently as the battery top cover, it protects the battery top cover from high temperatures and airflow impacts and further simplifies the structure of the battery top cover.

[0014] In one possible embodiment, the protection plate is provided between the top cover and the first wall.

[0015] In the present embodiment, the protective plate is disposed between the top cover and the first wall, i.e., between the top cover and the pressure relief mechanism, so that the protective plate can directly protect the top cover and protect it from high temperature and airflow impact, thereby improving the safety performance of the battery.

[0016] In one possible embodiment, the dimensions of the guard plate and the top cover are the same.

[0017] In the present embodiment, a protective plate is provided between the top cover and the first wall. If the protective plate and the top cover have the same dimensions, the protective plate can protect the top cover from the high-temperature, high-velocity gas-solid mixture released from the pressure relief mechanism and can improve the sealing effect of the battery's interior. Furthermore, if the protective plate and the top cover have the same dimensions, it is convenient for the installation process and reduces the difficulty of installation.

[0018] In one possible embodiment, the protection plate has smaller dimensions than the top cover.

[0019] In the embodiment of the present application, the protection plate is disposed between the top cover and the first wall, and when the size of the protection plate is smaller than that of the top cover, the protection plate can protect the top cover and reduce the cost.

[0020] In one possible embodiment, the guard plate is strip-shaped, the projection of the guard plate on the first wall covering the pressure relief mechanism.

[0021] In the embodiment of the present application, the protective plate is disposed between the top cover and the first wall, and if the protective plate is strip-shaped and the projection on the first wall covers the pressure relief mechanism, the protective plate can maintain excellent protection effect for the top cover, while minimizing costs and avoiding waste of materials in the unprotected area.

[0022] In one possible embodiment, the guard plate is connected to the top cover by bolts or adhesive.

[0023] In the embodiment of the present application, the connection between the protection plate and the top cover can be realized by bolts or adhesive, which is simple, easy to operate, and advantageous for widespread application in production.

[0024] In one possible embodiment, the battery cell is housed in a housing, and the first wall is a wall of the battery cell that is close to and faces a bottom wall of the housing.

[0025] In the embodiment of the present application, when the first wall is a wall that is close to and opposite the bottom wall of the battery cell housing, the pressure relief mechanism faces the bottom wall. The protective plate is opposite the pressure relief mechanism, i.e., the protective plate is near the bottom wall. In the event of thermal runaway inside the battery cell, the polymer matrix composite fiber protective plate can block the high-temperature, high-velocity gas-solid mixture released from the pressure relief mechanism, protecting the battery bottom wall from airflow impact and high-temperature melting.

[0026] In one possible embodiment, the protective plate is provided integrally with the bottom wall of the housing.

[0027] In the embodiment of the present application, the protective plate is integrally formed on the bottom wall. The protective plate may function together with the bottom wall as the bottom wall of the battery, or the protective plate may function independently as the bottom wall of the battery. When the protective plate functions together with the bottom wall as the bottom wall of the battery, the protective plate protects the bottom wall and better protects the safety of the battery. When the protective plate functions independently as the bottom wall of the battery, it protects the bottom wall of the battery from high temperatures and airflow impacts, and further simplifies the structure of the bottom wall of the battery.

[0028] In one possible embodiment, the guard plate is provided between the bottom wall and the first wall.

[0029] In the present embodiment, the protective plate is disposed between the bottom wall and the first wall, i.e., between the bottom wall and the pressure relief mechanism, so that the protective plate can directly protect the bottom wall and protect it from high temperature and airflow impact, thereby ensuring the safety performance of the battery.

[0030] In one possible embodiment, a thermal management member is provided between the protective plate and the first wall, and the thermal management member is used to contain a fluid so as to regulate the temperature of the battery cells.

[0031] In the present embodiment, a protective plate is provided between the first wall and the battery housing, or the protective plate directly functions as the battery housing, thereby protecting the battery housing from high temperatures and airflow impact, and improving the safety performance of the battery. A thermal management member for adjusting the temperature of the battery cells is provided between the first wall and the protective plate, so that the temperature of the battery cells can be adjusted according to the actual needs of the battery cells, ensuring normal operation of the battery cells.

[0032] In one possible embodiment, the thermal management member is provided with a weakened area facing the pressure relief mechanism, the weakened area being arranged to be broken by exhaust from the battery cell when the pressure relief mechanism is activated, allowing the exhaust to pass through the weakened area.

[0033] In the present application, a protective plate is provided between the first wall and the battery housing, or the protective plate directly functions as the battery housing, thereby protecting the safety of the battery housing. A thermal management member is provided between the first wall and the protective plate, allowing the temperature of the battery cell to be adjusted according to the actual needs of the battery cell, ensuring normal operation of the battery cell. If a weak area is provided in the thermal management member, and if airflow impact or high temperature damages the weak area, the discharged material can be quickly discharged through the weak area and away from the battery cell, reducing the risk of discharged material reaching the battery and improving the safety performance of the battery.

[0034] In one possible embodiment, a heat insulating member is provided between the protective plate and the housing.

[0035] In the present embodiment, a protective plate is installed between the first wall where the pressure relief mechanism is installed and the housing, thereby protecting the battery housing from the impact of high-temperature, high-velocity airflow. An insulating member is also installed between the protective plate and the housing, thereby further reducing the temperature of the housing and improving the safety performance of the battery.

[0036] In one possible embodiment, the heat insulating member is an air gap layer.

[0037] In the embodiment of the present application, by providing an air intervening layer as a heat insulating member between the protective plate and the housing, the temperature of the housing can be further reduced, and the safety performance of the battery can be improved.

[0038] In one possible embodiment, the protective plate includes multiple fiber-reinforced resin layers, and the fiber-reinforced resin layers are formed by combining a fiber material and a resin material.

[0039] In the embodiment of the present application, fiber-reinforced resin is a high-temperature and impact-resistant material, and this material is used to manufacture a protective plate, which is disposed between the pressure relief mechanism and the housing. When the high temperature inside the battery cell and waste material is ejected from the battery cell at high speed, the protective plate can protect the housing from melting at high temperature and the impact of the high-speed waste material, thereby ensuring the safety of the battery.

[0040] In one possible embodiment, the resin material is a silicone-based aerogel-modified resin or a high-temperature flame-retardant resin.

[0041] In the present embodiment, the composite material formed from fiber and resin has high temperature resistance and impact resistance. By using two types of materials, silicone-based aerogel-modified resin and high-temperature resistant flame-retardant resin, the high temperature resistance and impact resistance of the protective plate can be further improved.

[0042] In one possible embodiment, the fiber material is at least one of fibers such as glass fibers, ceramic fibers, carbon fibers, quartz fibers, high silica fibers, alumina silicate fibers, mullite fibers, silicon carbide fibers, silicon nitride fibers, alumina fibers, boron nitride fibers, basalt fibers, brucite fibers, attapulgite fibers, boron fibers, carbon nanotube fibers, aramid fibers, polyimide fibers, and ultra-high molecular weight polyethylene fibers.

[0043] In one possible embodiment, the fiber material is a ceramic fiber material.

[0044] In the present invention, the composite material formed by combining fibers and resin has high temperature resistance and impact resistance. The ceramic fiber material has better high temperature resistance than other fiber materials.

[0045] In one possible embodiment, the ceramic fiber material is silica or alumina.

[0046] In the present embodiment, the protective plate made of silica or alumina has the best high temperature resistance.

[0047] In one possible embodiment, the thickness of the fiber material is between 6 and 100 μm.

[0048] In the embodiment of the present application, a fiber material with a thickness of 6 to 100 μm is used, which allows the protective plate to have high temperature resistance and impact resistance, and also reduces production costs.

[0049] In one possible embodiment, the thickness of the protection plate is 0.2 to 5 mm.

[0050] In the embodiment of the present application, the protective plate has a thickness of 0.2 to 5 mm, which allows the protective plate to have high temperature resistance and impact resistance, and also reduces production costs.

[0051] According to a second aspect, there is provided a power consuming device, the power consuming device comprising a battery for providing power as described in any one of the above embodiments. [Brief explanation of the drawings]

[0052] [Figure 1] 1 is a structural schematic diagram of a vehicle according to an embodiment of the present invention; [Figure 2] 1 is a schematic exploded view of a battery according to an embodiment of the present invention; [Figure 3] 1 is a schematic exploded view of a battery cell according to an embodiment of the present invention; [Figure 4] FIG. 2 is a schematic exploded view of a battery according to another embodiment of the present invention. [Figure 5] 1 is a schematic diagram of a half cross-sectional structure of a battery case according to an embodiment of the present invention. [Figure 6] 1 is a schematic diagram of a top cover of a battery according to one embodiment of the present application. [Figure 7] FIG. 2 is a schematic exploded view of a battery according to another embodiment of the present invention. [Figure 8] FIG. 2 is a schematic exploded view of a battery according to another embodiment of the present invention. [Figure 9] 2 is a schematic exploded view of the bottom wall of a battery according to an embodiment of the present invention; FIG. [Figure 10] FIG. 2 is a schematic diagram of a half cross-sectional structure of a battery casing according to another embodiment of the present invention. [Figure 11] FIG. 10 is a schematic exploded view of the bottom wall of a battery according to another embodiment of the present invention. [Figure 12] 1 is a schematic diagram of the structure of a fiber resin reinforced layer according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0053] Hereinafter, the embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are merely for the purpose of more clearly illustrating the technical solution of the present application, and are merely illustrative and do not limit the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used herein are only for describing specific embodiments and are not intended to limit the scope of the present application. The terms "comprises," "having," and any variations thereof in the specification, claims, and description of the drawings of the present application are intended to cover a non-exclusive "comprises."

[0055] In the description of the embodiments of the present application, technical terms such as "first," "second," etc. are used to distinguish between different objects, and should not be understood as indicating or implying relative importance, or suggesting the quantity, specific order, or hierarchical relationship of the technical features shown. In the description of the embodiments of the present application, unless otherwise clearly and specifically limited, "plurality" means two or more.

[0056] In this specification, when an "embodiment" is mentioned, it means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of such a term in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment with other embodiments. Those skilled in the art can clearly or implicitly understand that the embodiment described in this specification can be combined with other embodiments.

[0057] In the description of the embodiments of the present application, the term "and / or" merely describes the relationship between related objects and indicates that three relationships are possible; for example, A and / or B can indicate three cases: only A exists, A and B exist simultaneously, and only B exists. In addition, in this specification, the character " / " generally indicates that the related objects before and after it are in an "or" relationship.

[0058] In describing the examples of the present application, the term "plurality" refers to two or more (including two); similarly, "multiple groups" refers to two or more (including two groups); and "multiple sheets" refers to two or more (including two).

[0059] In describing the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are orientations or positional relationships based on the drawings and are intended merely for the convenience and simplification of the description of the embodiments of the present application. They do not indicate or imply that the devices or elements shown must have a specific orientation, be configured, or operate in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

[0060] In describing the embodiments of the present application, unless otherwise clearly specified or limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intervening object, an internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0061] In the present application, the battery cell may include a lithium metal battery, a sodium metal battery, a magnesium metal battery, or the like, but the embodiments of the present application are not limited thereto. The battery cell may be cylindrical, flat, or have other shapes, but the embodiments of the present application are not limited thereto. Battery cells are generally divided into three types based on the packaging method: prismatic battery cells, rectangular battery cells, and pouch battery cells, but the embodiments of the present application are not limited thereto. For convenience of explanation, the following embodiments will be described using a lithium metal battery as an example.

[0062] The term "battery" as used herein refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the term "battery" may include a battery module or a battery pack. A battery generally includes a housing for packaging one or more battery cells. The housing can prevent liquids or other foreign objects from affecting the charging and discharging of the battery cells.

[0063] In new energy battery vehicles, a battery case is installed inside the vehicle, and the batteries in the battery case discharge to drive the new energy vehicle's motor. As the demand for new energy vehicles continues to grow, the demand for battery energy density is also constantly increasing. For high-energy battery systems with silicon-added anodes, thermal runaway of a single battery or multiple batteries in the battery system generates gas with temperatures exceeding 1500°C. When the maximum gas velocity exceeds the speed of sound, conventional insulation materials primarily composed of aerogel cannot withstand the thermal and airflow shocks of such high-temperature, high-velocity airflow. Therefore, the insulation materials primarily composed of aerogel suffer structural thermal and mechanical disintegration, resulting in a failure of protection. When high-temperature, high-velocity airflow passes through the battery pack housing, the battery housing, made of steel plate with a melting point of 1500°C, is directly combusted. If the combustion continues for approximately 30 seconds, the body of the new energy vehicle will be directly destroyed, endangering the safety of passengers.

[0064] To solve the above problems, the embodiments of this application provide a technical solution in which a protective plate is provided inside the battery pack housing to block the high-temperature, high-velocity gas-solid mixture generated when the battery experiences thermal runaway, protecting the battery housing from airflow impact and high-temperature melting, thereby improving the safety performance of the battery.

[0065] The guard plates described in the embodiments of this application are suitable for batteries and battery-powered power consuming devices.

[0066] The power consuming devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, etc. The vehicles may be gasoline-powered automobiles, gas-powered automobiles, or new energy automobiles, and the new energy automobiles may be pure electric vehicles, hybrid automobiles, or range-extended automobiles, etc. The spacecraft may include airplanes, rockets, space shuttles, spaceships, etc. The electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. The power tools may include metal cutting power tools, grinding power tools, mounted power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, hammer drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not particularly limit the above-mentioned power consuming devices.

[0067] In the following embodiments, for convenience of explanation, the power consuming device will be described as a vehicle.

[0068] 1 is a structural schematic diagram of a vehicle 1 according to one embodiment of the present application. As shown in FIG. 1, a battery 2 is provided inside the vehicle 1, and the battery 2 may be provided at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, and for example, the battery 2 may function as an operating power source for the vehicle 1.

[0069] 2 is an exploded schematic view of a battery 2 according to one embodiment of the present application. As shown in FIG. 2, the battery 2 includes a housing 20, battery cells 6, and a protective plate 8. The battery cells 6 and the protective plate 8 are housed within the housing 20.

[0070] The housing 20 is used to accommodate the battery cells 6. The housing 20 may have various structures. In some embodiments, the housing 20 may include a first housing portion 201 and a second housing portion 202, which are engaged with each other, and the first housing portion 201, together with the second housing portion 202, define an accommodation space 203 for accommodating the battery cells 6. The second housing portion 202 may have a hollow structure with an open end, or the first housing portion 201 may have a plate-like structure, and the first housing portion 201 may be engaged with the open side of the second housing portion 202 to form the housing 20 having the accommodation space 203. Alternatively, the first housing portion 201 and the second housing portion 202 may both have a hollow structure with an open end, and the open side of the first housing portion 201 may be engaged with the open side of the second housing portion 202 to form the housing 20 having the accommodation space 203. Of course, the first housing part 201 and the second housing part 202 may have various shapes, such as a cylindrical body or a rectangular parallelepiped.

[0071] In order to improve the sealing performance after the first housing part 201 and the second housing part 202 are connected, a sealing material, such as a sealant or a seal ring, may be provided between the first housing part 201 and the second housing part 202.

[0072] When the first housing part 201 is engaged with the top of the second housing part 202, the first housing part 201 may be referred to as a top cover and the second housing part 202 may be referred to as a bottom wall.

[0073] The battery 2 includes a plurality of battery cells 6. The plurality of battery cells 6 may be connected in series, in parallel, or in series-parallel. A series-parallel connection means that some of the plurality of battery cells 6 are connected in series and others are connected in parallel. The plurality of battery cells 6 may be directly connected in series, in parallel, or in series-parallel before the entirety of the plurality of battery cells 6 is housed in the housing 20. Of course, the plurality of battery cells 6 may first be connected in series, in parallel, or in series-parallel to form a battery module (not shown), and then the plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a whole and housed in the housing 20. The plurality of battery cells 6 in a battery module may be electrically connected via busbar members to realize a parallel connection, a series connection, or a series-parallel connection of the plurality of battery cells 6 in the battery module.

[0074] FIG. 3 is a structural schematic diagram of a battery cell 6 according to one embodiment of the present application. As shown in FIG. 3, the battery cell 6 includes one or more electrode assemblies 61, a case 621, and an end cover 622. The case 621 and the end cover 622 form a housing or battery box 62. The walls of the case 621 and the end cover 622 are both referred to as the walls of the battery cell 6. In the case of a rectangular parallelepiped battery cell 6, the walls of the case 621 include a bottom wall and four side walls. The shape of the case 621 is determined by the shape of the case after one or more electrode assemblies 61 are assembled. For example, the case 621 may be a hollow rectangular parallelepiped, square, or cylindrical body, and one surface of the case 621 may have an opening through which one or more electrode assemblies 61 can be disposed. For example, if the case 621 is a hollow rectangular parallelepiped or square, one plane of the case 621 is an open plane, i.e., the plane does not have a wall and allows communication between the inside and outside of the case 621. When the case 621 is a hollow cylinder, the end surface of the case 621 is an open surface, i.e., the end surface has no wall and communicates with the inside and outside of the case 621. An end cover 622 covers the opening and is connected to the case 621 to form a closed chamber for disposing the electrode assembly 61. The case 621 is filled with an electrolyte, for example, an electrolyte solution.

[0075] The battery cell 6 may further include two electrode terminals 63, which may be provided on the end cover 622. The end cover 622 has a generally flat plate shape, and the two electrode terminals 63 are fixed to the flat surface of the end cover 622, and the two electrode terminals 63 are respectively a positive electrode terminal 631 and a negative electrode terminal 632. A connection unit 64 (which may also be called a current collecting unit 64) is provided corresponding to each electrode terminal 63, and is located between the end cover 622 and the electrode assembly 61, and is used to realize an electrical connection between the electrode assembly 61 and the electrode terminals 63.

[0076] The battery cell 6 can be configured to have a single electrode An assembly 61 may be provided, electrodeAn assembly 61 may be provided, and as shown in FIG. electrode An assembly 61 is provided.

[0077] The battery cell 6 may be provided with a pressure relief mechanism 65. The pressure relief mechanism 65 is used to operate when the pressure or temperature inside the battery cell 6 reaches a threshold value, thereby relieving the internal pressure or temperature.

[0078] 4 is a schematic exploded view of a battery according to another embodiment of the present invention. As shown in FIG. 4, the battery 2 includes a battery cell 6. A pressure relief mechanism 65 and a protective plate 8 are provided on a first wall of the battery cell 6. The protective plate 8 is disposed opposite the pressure relief mechanism 65, and the protective plate 8 is a polymer matrix composite fiberboard.

[0079] In the embodiment of the present application, the pressure relief mechanism 65 is a structural member that operates when the pressure or temperature inside the battery cell 6 reaches a threshold value to relieve the pressure inside the battery cell 6. For example, the pressure relief mechanism 65 may be a temperature-sensitive pressure relief mechanism that is arranged to melt when the temperature inside the battery cell 6 in which the pressure relief mechanism 65 is provided reaches a threshold value, and / or the pressure relief mechanism 65 may be a pressure-sensitive pressure relief mechanism that is arranged to burst when the air pressure inside the battery cell 6 in which the pressure relief mechanism 65 is provided reaches a threshold value, and the present application does not limit the type of pressure relief mechanism.

[0080] The battery 2 includes a battery cell 6, and a pressure relief mechanism 65 for protecting the battery cell 6 is provided on a first wall of the battery cell 6. The battery 2 further includes a protective plate 8, and the protective plate 8 is provided opposite the pressure relief mechanism 65, i.e., the protective plate 8 directly faces the pressure relief mechanism 65. The protective plate 8 is a polymer matrix composite fiberboard, and is resistant to high temperatures and impacts.

[0081] In the above-mentioned technical proposal, the pressure relief mechanism 65 Protective plate 8By arranging the protective plate 8 opposite the pressure relief mechanism 65, if thermal runaway occurs inside the battery cell 6, the protective plate 8 made of polymer matrix composite fiber can block the high-temperature, high-velocity gas-solid mixture released from the pressure relief mechanism 65, protecting the battery case from airflow impact and high-temperature melting, and ensuring the safety of the battery 2.

[0082] Optionally, the polymer matrix composite fiberboard is a fiber reinforced resin composite board.

[0083] In the above-mentioned technical proposal, a fiber-reinforced resin composite plate is manufactured as the protective plate 8 using a resin in a polymer material as the matrix, and compared with other polymer material matrices, the fiber-reinforced resin composite plate has superior high temperature resistance and impact resistance.

[0084] Alternatively, as shown in FIG. 4, the battery cell 6 is housed in a housing 20, and the first wall is a wall provided in the battery cell 6 near a top cover 201 of the housing 20 and facing the top cover 201.

[0085] When the first wall is a wall that is close to the top cover 201 of the housing 20 of the battery cell 6 and that is provided facing the top cover 201 , the pressure relief mechanism 65 faces closer to the top cover 201 .

[0086] In the above-described technical solution, the protective plate 8 is disposed between the pressure relief mechanism 65 and the top cover 201. In the event of thermal runaway of the battery cell 6, when the temperature and pressure inside the battery cell 6 are released through the pressure relief mechanism 65, the protective plate 8, which is a polymer matrix composite fiber, blocks the high-temperature, high-velocity gas-solid mixture released from the pressure relief mechanism 65, protecting the top cover 201 of the battery 2 from airflow impact and high-temperature melting, thereby ensuring the safety of the battery 2.

[0087] 5 is a schematic diagram of a half cross-sectional structure of a battery case according to an embodiment of the present invention. As shown in FIG. 5, the protective plate 8 is optionally provided integrally with the top cover 201.

[0088] The protective plate 8 is integrally formed with the top cover 201, that is, the protective plate 8 may function together with the top cover 201 as the top cover 201 of the battery 2, or the protective plate 8 may function alone as the top cover 201 of the battery 2, as shown in Figure 5.

[0089] In the above-mentioned technical solution, when the protective plate 8 functions together with the top cover 201 as the top cover 201 of the battery 2, the top cover 201 of the battery 2 has a two-layer structure, and the protective plate 8 protects the top cover 201, thereby better protecting the safety of the battery 2. When the protective plate 8 functions alone as the top cover 201 of the battery 2, the protective plate 8 can maintain protection of the top cover 201 of the battery 2 from high temperatures and airflow impacts, and can further simplify the structure of the battery 2 and reduce the production costs of the battery 2.

[0090] 6 is a schematic diagram of a top cover according to one embodiment of the present application. As shown in FIG. 6, when the protective plate 8 is integrally formed on the top cover 201, the top cover 201 may have an irregular shape. In the present embodiment, the top cover 201 may have a rectangular or circular shape, but the present application is not limited thereto. That is, during the production process, the top cover 201 and the protective plate 8 may be manufactured in any shape according to the needs of a specific product.

[0091] Optionally, as shown in FIG. 4, a protection plate 8 is provided between the top cover 201 and the first wall.

[0092] The protection plate 8 is provided between the top cover 201 and the first wall, that is, the pressure relief mechanism 65 faces the top cover 201 and the protection plate 8 is provided between the top cover 201 and the pressure relief mechanism 65 .

[0093] In the above-mentioned technical solution, the protective plate 8 is disposed between the top cover 201 and the pressure relief mechanism 65, so that the pressure relief mechanism 65 faces the top cover 201. In this way, the protective plate 8 can directly protect the top cover 201, and the top cover 201, which faces the pressure relief mechanism 65, is protected from high temperatures and airflow impacts, thereby ensuring the safety of the battery 2.

[0094] Continuing with reference to FIG. 4, optionally, the dimensions of the protection plate 8 and the top cover 201 are the same.

[0095] The protective plate 8 is disposed between the top cover 201 and the pressure relief structure 65, and the dimensions of the protective plate 8 and the top cover 201 are the same, so that the protective plate 8 can better protect the top cover 201.

[0096] In the above technical solution, the protective plate 8 is disposed between the top cover 201 and the pressure relief structure 65, and the dimensions of the protective plate 8 and the top cover 201 are the same, so that the protective plate 8 can better protect the top cover 201 and protect it from the high-temperature, high-velocity gas-solid mixture released from the pressure relief mechanism 65, and also serve to seal the inside of the battery 2. Furthermore, if the dimensions of the protective plate 8 and the top cover 201 are the same, it is convenient for the installation work and reduces the difficulty of installation.

[0097] 7 is a schematic exploded view of the battery according to another embodiment of the present invention, as shown in FIG. 7, the size of the protective plate 8 is optionally smaller than that of the top cover 201.

[0098] In the above-mentioned technical solution, the protective plate 8 is disposed between the top cover 201 and the first wall where the pressure relief mechanism 65 is disposed. If the dimensions of the protective plate 8 are smaller than those of the top cover 201, the protective plate 8 can protect the top cover 201, thereby improving the safety performance of the battery 2 and also reducing production costs.

[0099] 8 is a schematic exploded view of a battery according to another embodiment of the present invention. As shown in FIG. 8, the protective plate 8 is optionally strip-shaped, and the projection on the first wall of the protective plate 8 covers the pressure relief mechanism 65.

[0100] The shape of the protective plate 8 may be a strip as shown in FIG. 8, or may be a circle or any other shape, as long as the projection of the protective plate 8 on the first wall can cover the pressure relief mechanism 65 and perform the function of protecting the housing of the battery 2, and the present application does not limit the shape of the protective plate 8.

[0101] In the above technical solution, the protective plate 8 is disposed between the top cover 201 and the first wall. If the protective plate 8 is strip-shaped and its projection on the first wall covers the pressure relief mechanism 65, the protective plate 8 can maintain a good protection effect for the top cover 201, while minimizing costs and avoiding waste of material in the unprotected area.

[0102] Optionally, the guard plate 8 is connected to the top cover 201 by bolts or adhesive.

[0103] There are various methods for connecting the protective plate 8 and the top cover 201, and the present application is not limited to these as long as they can be fixed together. In the actual production process, selecting a connection method that is simple and easy to work with will be advantageous for widespread use in actual operation.

[0104] In the above technical solution, the connection between the protection plate 8 and the top cover 201 is realized by using bolts or adhesive, which is simple and easy to operate, and is advantageous for widespread application in production.

[0105] 9 is a structural schematic diagram of the bottom wall of a battery according to an embodiment of the present application. As shown in FIG. 9, the battery cell 6 is optionally housed in a housing 20, and the first wall is a wall of the battery cell 6 that is close to and faces the bottom wall 202 of the housing 20.

[0106] When the first wall is a wall that is close to the bottom wall 202 of the housing 20 in the battery cell 6 and is provided opposite the bottom wall 202 , the pressure relief mechanism 65 faces closer to the bottom wall 202 .

[0107] In the above technical solution, the protective plate 8 is disposed between the pressure relief mechanism 65 and the bottom wall 202. When the battery cell 6 experiences thermal runaway, the pressure relief mechanism 65 releases the temperature and pressure inside the battery cell 6. The protective plate 8, which is a polymer matrix composite fiber, blocks the high-temperature, high-velocity gas-solid mixture released from the pressure relief mechanism 65, protecting the bottom wall 202 of the battery 2 from airflow impact and high-temperature melting, thereby ensuring the safety of the battery 2.

[0108] 10 is a schematic half-sectional view of the battery casing according to another embodiment of the present invention. As shown in FIG. 10, the protective plate 8 is optionally provided integrally with the bottom wall 202.

[0109] The protective plate 8 is integrally formed with the bottom wall 202, that is, the protective plate 8 may function together with the bottom wall 202 as the bottom wall 202 of the battery 2, or the protective plate 8 may function alone as the bottom wall 202 of the battery 2, as shown in Figure 10.

[0110] In the above technical solution, when the protective plate 8 functions together with the bottom wall 202 as the bottom wall 202 of the battery 2, the bottom wall 202 of the battery 2 has a double-layer structure, and the protective plate 8 protects the bottom wall 202, thereby better protecting the safety of the battery 2. When the protective plate 8 functions solely as the bottom wall 202 of the battery 2, the protective plate 8 can protect the bottom wall 202 of the battery 2 from high temperatures and airflow impacts, and can further simplify the structure of the battery 2 and reduce the production costs of the battery 2.

[0111] When the pressure relief mechanism 65 inside the battery 2 faces only the top cover 201, the protective plate 8 is provided integrally with the top cover 201 to protect the safety of the battery 2. When the pressure relief mechanism 65 faces only the bottom wall 202, the protective plate 8 is provided integrally with the bottom wall 202 to protect the safety of the battery 2. When the pressure relief mechanism 65 inside the battery 2 faces both the top cover 201 and the bottom wall 202, the protective plate 8 may be provided on both the top cover 201 and the bottom wall 202, as shown in Fig. 10. The present application does not specifically limit the placement of the protective plate 8 on the battery 2, as long as the protective plate 8 is present on the wall of the battery 2 that directly faces the pressure relief mechanism 65 of the battery cell 6; that is, the protective plate 8 may be on the top cover 201, the bottom wall 202, or a side wall. In addition, the protective plate 8 may be a cross member in the battery 2, and the specific position of the protective plate 8 may be changed depending on the arrangement position of the battery cells 6 in the battery 2, or may be provided at any position in the battery 2 according to actual operational needs.

[0112] Optionally, as shown in FIG. 9, a guard plate 8 is provided between the bottom wall 202 and the first wall.

[0113] The protection plate 8 is provided between the bottom wall 202 and the first wall, that is, the pressure relief mechanism 65 faces the bottom wall 202 and the protection plate 8 is provided between the bottom wall 202 and the pressure relief mechanism 65 .

[0114] In the above-mentioned technical solution, the protective plate 8 is disposed between the bottom wall 202 and the pressure relief structure 65, and the pressure relief structure 65 faces the top cover 201. In this way, the protective plate 8 can directly protect the bottom wall 202, and protect the bottom wall 202 opposite the pressure relief structure 65 from high temperatures and airflow impacts, thereby ensuring the safety of the battery 2.

[0115] Optionally, as shown in FIG. 9, a thermal management member 66 is provided between the protective plate 8 and the first wall, and the thermal management member 66 is used to contain a fluid and regulate the temperature of the battery cells 6.

[0116] The thermal management member 66 contains a fluid and is used to adjust the temperature of the battery cells 6. The fluid may be a liquid or a gas, and adjusting the temperature refers to heating or cooling the battery cells 6. When cooling or lowering the temperature of the battery cells 6, the thermal management member 66 contains a cooling fluid and is used to lower the temperature of the battery cells 6. In this case, the thermal management member 66 may be called a cooling member, a cooling system, a cooling plate, etc., and the contained fluid may be called a cooling medium or a cooling fluid, more specifically, a coolant or a cooling gas. The thermal management member 66 may also be used to heat the battery cells 6 and increase their temperature, but this embodiment is not limited thereto. Optionally, the fluid may circulate to improve the temperature adjustment effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, air, etc.

[0117] In the above-mentioned technical solution, the protective plate 8 is provided between the first wall and the housing of the battery 2, or the protective plate 8 directly functions as the housing of the battery 2, thereby protecting the housing of the battery 2 from high temperatures and airflow impact, and ensuring the safety of the battery 2. By providing a thermal management member between the first wall and the protective plate 8 to adjust the temperature of the battery cells 6, the temperature of the battery cells 6 can be adjusted according to the needs of the battery cells 6, allowing the battery cells 6 to operate normally.

[0118] Optionally, the thermal management member 66 is provided with a weakened area 661 facing the pressure relief mechanism 65, the weakened area 661 being arranged to be broken by the discharged matter of the battery cell 6 when the pressure relief mechanism 65 is activated, allowing the discharged matter to pass through the weakened area 661.

[0119] The weakened area 661 may adopt various designs that are easily broken by the discharged material, and the embodiments of the present application are not limited thereto.

[0120] The thermal management member 66 may be made of a heat-conductive material and include passages containing a fluid. The fluid flows through the passages and transfers heat through the heat-conductive material to regulate the temperature of the battery cells 6. In the present embodiment, the weakened region 661 may contain only a heat-conductive material and no fluid, and may already have a thin heat-conductive material layer that is easily destroyed by the discharge. For example, the side of the weakened region 661 closest to the bottom wall 202 may be a heat-conductive material layer to form the weakened region 661.

[0121] In the above-mentioned technical solution, the protective plate 8 is disposed between the first wall and the housing of the battery 2, or the protective plate 8 directly functions as the housing of the battery 2, thereby protecting the safety of the battery 2. By disposing the thermal management member 66 between the first wall and the protective plate 8, the temperature of the battery cells 6 can be adjusted according to the actual needs of the battery cells 6 to ensure the normal functioning of the battery cells 6. By disposing the weak area 661 in the thermal management member 66, when the weak area 661 is damaged by airflow impact or high temperature, the discharged matter can be quickly discharged through the weak area 661 and away from the battery cells 6, reducing the risk of discharged matter reaching the battery 2 and improving the safety performance of the battery 2.

[0122] 11 is a schematic exploded view of the bottom wall of a battery according to another embodiment of the present invention. As shown in FIG. 11, in one embodiment of the present invention, a heat insulating member 67 is provided between the protective plate 8 and the housing 20.

[0123] In the above-described technical solution, by adding a protective plate 8 between the first wall where the pressure relief mechanism 65 is provided and the housing 20, the housing 20 of the battery 2 can be protected from the impact of high-temperature, high-velocity airflow. By further providing a heat insulating member 67 between the protective plate 8 and the housing 20, the temperature of the housing 20 can be further reduced, thereby protecting the safety of the battery 2.

[0124] Selectively, Heat insulating materials 67 is an air intervening layer.

[0125] The purpose of adding the insulating member 67 is to further reduce the temperature of the housing 20, and if an air intervening layer is used as the insulating member 67, the heat transfer from inside the battery 2 to the housing 20 can be significantly reduced, and the insulating effect is very significant.

[0126] In the above-mentioned technical solution, by providing an air intervening layer as a heat insulating member 67 between the protective plate 8 and the housing 20, the temperature of the housing 20 can be further reduced and the safety performance of the battery 2 can be improved.

[0127] 12 is a structural schematic diagram of a fiber-reinforced resin layer according to one embodiment of the present invention. As shown in FIG. 12, the protective plate 8 optionally includes multiple fiber-reinforced resin layers 81, which are formed by combining a fiber material and a resin material.

[0128] The present application does not limit the process for combining the fiber material and the resin material. For example, the fiber-reinforced resin layer 81 can be manufactured by immersing a single fiber material layer 811 in a resin slurry, allowing the resin slurry to fully infiltrate the fiber pores 812 in the single fiber material layer 811, and then baking the layer at a temperature of 60°C to 120°C for 3 to 30 minutes. One to 20 fiber-reinforced resin layers 81 are stacked and hot-pressed at a pressure of 0.1 to 10 MPa and a temperature of 100°C to 200°C to manufacture the protective plate 8.

[0129] The present application does not limit the method for producing the resin material slurry. For example, in the examples of the present application, the resin material slurry may be composed of a water-based elastic paint, a resin material, a flame retardant, a dispersant, a coupling agent, silica powder, and short fibers in a mass ratio of (35-55):(15-34):(15-20):(1-3):(0.5-3):(1-3):(0.5-3).

[0130] The fiber-reinforced resin material in the examples of this application is black-brown in color and has excellent acid resistance, mechanical properties, and heat resistance. It can maintain its structural integrity and dimensional stability even at very high temperatures, and is widely used in anti-corrosion engineering, adhesives, and flame retardants.

[0131] In the above technical solution, fiber-reinforced resin is a high-temperature and impact-resistant material, and this material is used to manufacture the protective plate 8, which is disposed between the pressure relief mechanism 65 and the housing 20. When the high temperature inside the battery cells 6 and the discharged materials are ejected at high speed from the battery cells 6, the protective plate 8 protects the housing 20 from melting at high temperature and the impact of the discharged materials at high speed, thereby ensuring the safety of the battery 2.

[0132] Optionally, the resin material is a silicone-based aerogel modified resin or a high temperature flame retardant resin.

[0133] The resin material in the present embodiment may be a silicone-based aerogel modified resin or a high-temperature flame-retardant resin.

[0134] In the above-mentioned technical solution, the composite material formed by fiber and resin has high temperature resistance and impact resistance. By using two materials, namely, silicone-based aerogel-modified resin and high-temperature resistant flame-retardant resin, the high temperature resistance and impact resistance of the protective plate 8 can be further improved.

[0135] Optionally, the fiber material may be at least one of fibers such as glass fiber, carbon fiber, quartz fiber, high silica fiber, alumina silicate fiber, mullite fiber, silicon carbide fiber, silicon nitride fiber, alumina fiber, boron nitride fiber, basalt fiber, brucite fiber, attapulgite fiber, boron fiber, carbon nanotube, aramid fiber, polyimide fiber, and ultra-high molecular weight polyethylene fiber.

[0136] Optionally, the fiber material is a ceramic fiber material.

[0137] In the present embodiment, the ceramic fibers have superior high temperature resistance capabilities over a variety of fiber materials.

[0138] In the above-mentioned technical solution, the material formed by combining fiber and resin has high temperature resistance and impact resistance, and the ceramic fiber material has better high temperature resistance than other fiber materials.

[0139] Optionally, the ceramic fiber material is silica or alumina.

[0140] In the above-mentioned technical solutions, the protective plate 8 made of silica or alumina has the best high temperature resistance.

[0141] Optionally, the thickness of the fiber material is between 6 and 100 μm.

[0142] In the above technical solution, by using a fiber material with a thickness of 6 to 100 μm, the protective plate 8 has high temperature resistance and impact resistance, and can also reduce production costs.

[0143] Optionally, the thickness of the protection plate 8 is 0.2 to 5 mm.

[0144] In the above technical solution, the protective plate 8 having a thickness of 0.2 to 5 mm is used, so that the protective plate 8 has high temperature resistance and impact resistance, and also reduces production costs.

[0145] An embodiment of the present application further provides a power consuming device, which includes the battery 2 for providing power in the above-described embodiment.

[0146] The following examples of the present application are described. The examples described below are illustrative and are intended to help interpret the present application and should not be understood as limitations on the present application. If specific techniques or conditions are not specified in the examples, they should be carried out in accordance with the techniques, conditions, or product instructions described in literature in this field.

[0147] The protective plates made of fiber-reinforced resin material were subjected to tensile performance tests, the results of which are shown in Table 1; compression performance tests, the results of which are shown in Table 2; bending performance tests, the results of which are shown in Table 3; rib shear performance tests, the results of which are shown in Table 4; and impact performance tests, the results of which are shown in Table 5.

[0148] [Table 1]

[0149] [Table 2]

[0150] [Table 3]

[0151] [Table 4]

[0152] [Table 5]

[0153] In addition, a hardness test was conducted on the 3 mm thick protective plate, and the test results showed that the Shore D hardness was 87 and the Barcol thickness was 46.

[0154] Although the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for the components therein without departing from the scope of the present application. In particular, the technical features recited in each embodiment may be combined in any manner unless there is a structural contradiction. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims. [Explanation of symbols]

[0155] 1 vehicle 2 batteries 6 battery cells 8 Protective plate 20 Case 61 Electrode Assembly 62 Housing 63 Electrode terminal 64 connection units 65 Pressure relief mechanism 66 Thermal management components 67 Heat insulating materials 81 Fiber reinforced resin layer 811 Fiber material layer 812 Fiber pores 201 First housing part / top cover 202 Second housing part / bottom wall 203 Containment Space 621 cases 622 End cover 631 Positive electrode terminal 632 Negative electrode terminal 661 Vulnerable area

Claims

1. The battery cell (6) has a pressure relief mechanism (65) on a first wall thereof, and a protective plate (8) that is a polymer matrix composite fiberboard and is provided opposite the pressure relief mechanism (65), The battery cell (6) is housed in a housing (20), and the first wall is a wall that is close to a bottom wall (202) of the housing (20) of the battery cell (6) and is provided opposite the bottom wall (202); The protective plate (8) is provided between the bottom wall (202) and the first wall, a thermal management member (66) is provided between the protective plate (8) and the first wall so as to be in contact with the protective plate (8), the thermal management member (66) being used to contain a fluid so as to regulate the temperature of the battery cells (6); The thermal management member (66) is provided with a weakened area (661) facing the pressure relief mechanism (65), and the weakened area (661) is arranged so that when the pressure relief mechanism (65) is activated, the weakened area (661) is broken by exhaust from the battery cell (6) to allow the exhaust to pass through the weakened area (661).

2. 2. The battery according to claim 1, wherein the polymer matrix composite fiberboard is a fiber reinforced resin composite board.

3. 3. The battery according to claim 1, wherein the protective plate (8) and the bottom wall (202) have the same dimensions.

4. 3. The battery according to claim 1, wherein the dimensions of the protection plate (8) are smaller than the dimensions of the bottom wall (202).

5. 3. The battery according to claim 1, wherein the protective plate (8) is strip-shaped, and the projection of the protective plate (8) on the first wall covers the pressure relief mechanism (65).

6. 3. The battery according to claim 1, wherein the protective plate (8) is integrally provided on the bottom wall (202) of the housing (20).

7. 3. The battery according to claim 1, wherein a heat insulating member (67) is provided between the protective plate (8) and the housing (20).

8. 8. The battery according to claim 7, wherein the heat insulating member (67) is an air intervening layer.

9. The battery according to claim 1 or 2, characterized in that the protective plate (8) includes a multi-layer fiber-reinforced resin layer (81), and the fiber-reinforced resin layer (81) is formed by combining a fiber material and a resin material.

10. 10. The battery according to claim 9, wherein the resin material is a silicone-based aerogel-modified resin or a high-temperature resistant flame-retardant resin.

11. 10. The battery according to claim 9, wherein the fiber material is at least one of glass fiber, ceramic fiber, carbon fiber, quartz fiber, high silica fiber, alumina silicate fiber, mullite fiber, silicon carbide fiber, silicon nitride fiber, alumina fiber, boron nitride fiber, basalt fiber, brucite fiber, attapulgite fiber, boron fiber, carbon nanotube fiber, aramid fiber, polyimide fiber, and ultra-high molecular weight polyethylene fiber.

12. 12. The battery of claim 11, wherein the fiber material is a ceramic fiber material.

13. 13. The battery of claim 12, wherein the ceramic fiber material is silica or alumina.

14. 10. The battery according to claim 9, wherein the thickness of the fiber material is 6 to 100 μm.

15. 3. The battery according to claim 1, wherein the thickness of the protective plate (8) is 0.2 to 5 mm.

16. A power consuming device comprising a battery (2) for providing power according to claim 1 or 2.

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