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 to Chinese patent application No. 202210423355.6, entitled "Battery and Power Consumption Device," filed on April 21, 2022, 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 case, electric vehicles are a key component of vehicle sustainability due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is a key factor in their development.

[0004] In the development of battery technology, in addition to improving the performance of the battery, safety is also an issue that cannot be ignored. If the safety of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to improve the safety of the battery 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 air flow 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, the protective plate being a polymer matrix composite fiberboard, disposed opposite the pressure relief mechanism.

[0007] In the embodiment of the present application, the battery includes a battery cell with a pressure relief mechanism provided on a first wall to protect the battery cell, and the battery further includes a protective plate provided opposite the pressure relief mechanism, i.e., the protective plate faces the pressure relief mechanism. The protective plate is a polymer matrix composite fiberboard and has high temperature resistance and impact resistance. By providing the pressure relief mechanism opposite the protective plate, when the battery cell experiences thermal runaway, the protective plate, which is a polymer matrix composite fiberboard, can block the high temperature and high speed gas-solid mixture released from the pressure relief mechanism, protecting the battery case from airflow impact and high temperature melting, and ensuring the safety of the battery.

[0008] In one possible embodiment, the polymer matrix composite fibre board is a fibre 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 a matrix. Compared with other polymeric matrix materials, the fiber-reinforced resin composite plate has excellent high temperature resistance and impact resistance.

[0010] 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 a top cover of the housing and faces the top cover.

[0011] In the embodiment of the present application, when the first wall is a wall close to and facing the top cover of the battery cell housing, the pressure relief mechanism faces the top cover. The protective plate is facing the pressure relief mechanism, that is, the protective plate is near the top cover. When the battery cell experiences thermal runaway, the protective plate, which is a 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 protective 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 top cover of the battery, or the protective plate may function independently as the top cover of the battery. When the protective plate functions together with the top cover as the top cover of the battery, the protective plate protects the top cover and better protects the battery. When the protective plate functions independently as the top cover of the battery, it protects the top cover of the battery from high temperature and airflow impact, and further simplifies the structure of the top cover of the battery.

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

[0015] In the embodiment of the present application, the protective plate is disposed between the top cover and the first wall, i.e., the protective plate is disposed between the top cover and the pressure relief mechanism, in this way the protective plate can directly protect the top cover, and protect the top cover from high temperature and air flow 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 embodiment of the present application, the 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 and protect it from the high-temperature and high-velocity gas-solid mixture released from the pressure relief mechanism, and can improve the effect of sealing the inside of the battery. And if the protective plate and the top cover have the same dimensions, it is convenient for the installation work and reduces the difficulty of installation.

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

[0019] In the embodiment of the present application, the protective plate is disposed between the top cover and the first wall. When the size of the protective plate is smaller than that of the top cover, the protective 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 provided between the top cover and the first wall. When the protective plate is strip-shaped and the projection on the first wall covers the pressure relief mechanism, the protective plate can maintain a good protective effect on the top cover, and can reduce the cost as much as possible and avoid the waste of materials in the non-protected 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 close to and facing the bottom wall of the battery cell housing, the pressure relief mechanism faces the bottom wall. The protective plate is facing the pressure relief mechanism, i.e., the protective plate is near the bottom wall. When thermal runaway occurs inside the battery cell, the protective plate, which is a polymer matrix composite fiber, can block the high-temperature and high-velocity gas-solid mixture released from the pressure relief mechanism, and protect the bottom wall of the battery from air flow impact and high-temperature melting.

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

[0027] In the embodiment of the present application, the protective plate is integrally provided 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 to better protect 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 temperature and air flow impact, 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 embodiment of the present application, the protective plate is disposed between the bottom wall and the first wall, i.e., the protective plate is disposed between the bottom wall and the pressure relief mechanism, in this way, the protective plate can directly protect the bottom wall, and protect the bottom wall from high temperature and air flow impact, so as to ensure 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 embodiment of 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 battery housing from high temperature and airflow impact, and improving the safety performance of the battery. A thermal management member for adjusting the temperature of the battery cell is provided between the first wall and the protective plate, so that the temperature of the battery cell can be adjusted according to the actual needs of the battery cell, and the battery cell can be guaranteed to operate normally.

[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 embodiment of the present application, the safety of the battery housing can be protected by providing a protective plate between the first wall and the battery housing, or by having the protective plate directly function as the battery housing. By providing a thermal management member between the first wall and the protective plate, the temperature of the battery cell can be adjusted according to the actual needs of the battery cell, and the battery cell can be ensured to operate normally. When the thermal management member is provided with a weak area, and the airflow impact or high temperature destroys the weak area, the discharge can be quickly discharged through the weak area and away from the battery cell, which can reduce the risk of discharge to the battery and improve 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 embodiment of the present application, a protective plate is provided between the first wall where the pressure relief mechanism is provided and the housing, thereby protecting the battery housing from the impact of high-temperature and high-velocity airflow. By providing an insulating member between the protective plate and the housing, the temperature of the housing can be further reduced, thereby improving the safety performance of the battery.

[0036] In one possible embodiment, the thermal insulation member is an air gap.

[0037] In the embodiment of the present application, an air intervening layer is provided between the protective plate and the housing as a heat insulating member, which can further reduce the temperature of the housing and improve the safety performance of the battery.

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

[0039] In the embodiment of the present application, the fiber-reinforced resin is a high-temperature resistant and impact resistant material, which is used to manufacture a protective plate, which is disposed between the pressure relief mechanism and the housing, so that when the high temperature inside the battery cell and the waste material fly out of the battery cell at high speed, the protective plate can protect the housing, protecting the housing from melting at high temperature and the impact of the waste material at high speed, and 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 embodiment of the present application, the material formed by combining 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 the following fibers: 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, ultra-high molecular weight polyethylene fiber, etc.

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

[0044] In the embodiment of the present application, the material formed by combining the fiber and the 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 embodiment of the present application, the protective plate made of silica or alumina has the best high temperature resistance.

[0047] In one possible embodiment, the thickness of the fibre 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, so that the protective plate has high temperature resistance and impact resistance, and the production cost can be reduced.

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

[0050] In the embodiment of the present application, a protective plate having a thickness of 0.2 to 5 mm is used, so that the protective plate has high temperature resistance and impact resistance, and the production cost can be reduced.

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

[0052] [Figure 1] 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application. [Diagram 2] 1 is a schematic exploded view of a battery according to an embodiment of the present application; [Diagram 3] FIG. 2 is a schematic exploded view of a battery cell according to an embodiment of the present application. [Figure 4] FIG. 2 is a schematic exploded view of a battery according to another embodiment of the present application. [Diagram 5] 1 is a schematic diagram of a half-sectional structure of a battery case according to an embodiment of the present application. [Figure 6] FIG. 2 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 application. [Figure 8] FIG. 2 is a schematic exploded view of a battery according to another embodiment of the present application. [Figure 9] FIG. 2 is a schematic exploded view of the bottom wall of a battery according to an embodiment of the present application. [Figure 10] FIG. 4 is a schematic diagram of a half-sectional structure of a battery casing according to another embodiment of the present application. [Figure 11] FIG. 4 is a schematic exploded view of the bottom wall of a battery according to another embodiment of the present application. [Figure 12] FIG. 2 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 PREFERRED EMBODIMENTS

[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 present application. The terms "including" and "having" and any variations thereof in the specification, claims, and description of the drawings of this application are intended to cover non-exclusive "including".

[0055] In the description of the embodiments of the present application, technical terms such as "first", "second", etc. are used to distinguish 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 the term in each place in the specification does not necessarily refer to the same embodiment, nor is it an embodiment mutually exclusive, independent, or alternative to 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 there are three possible relationships, 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 objects before and after it are in an "or" relationship.

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

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

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "attached", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, may be a fixed connection, a detachable connection, or an integral connection, may be a mechanical connection, may be an electrical connection, may be a direct connection, may be an indirect connection through an intermediary, may be an internal communication between two elements, or may be an interactive relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present application according to the specific circumstances.

[0061] In the present application, the battery cell may include a lithium metal battery, a sodium metal battery, a magnesium metal battery, etc., and the embodiments of the present application are not limited thereto. The battery cell may be a cylinder, a flat body, or other shapes, and the embodiments of the present application are not limited thereto. Generally, the battery cell is divided into three types according to the packaging manner, namely, a prismatic battery cell, a rectangular battery cell, and a pouch battery cell, and the embodiments of the present application are not limited thereto. In the following embodiments, for convenience of explanation, a lithium metal battery is taken as an example.

[0062] The battery referred to in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack. The 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, the battery case as energy is installed in the vehicle, and the battery in the battery case is discharged to drive the motor of the new energy vehicle. As the demand for new energy vehicles gradually increases, the demand for the energy density of the battery is also constantly increasing. For a high-energy battery system with anode silicon addition, when a single battery or multiple batteries in the battery system undergo thermal runaway, gas with a temperature greater than 1500°C is generated. When the maximum speed of the gas is greater than the speed of sound, the insulation material mainly composed of aerogel in the prior art cannot withstand the temperature shock and air flow shock of such high-temperature and high-speed air flow, so the insulation material mainly composed of aerogel will undergo structural thermal dismantling and mechanical dismantling, and the protection will fail. When the high-temperature and high-speed air flow passes through the battery pack housing, the battery housing made of steel plate with a melting point of 1500°C will directly burn, and if the burning continues for about 30s, the body of the new energy vehicle will be directly destroyed, endangering the safety of passengers.

[0064] In order to solve the above problems, the embodiments of the present application provide a technical solution, in which a protective plate material is provided inside the battery pack housing, which can block the high-temperature and high-velocity gas-solid mixture generated when the battery goes into thermal runaway, and protects 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 power consuming devices that use batteries.

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

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

[0068] Fig. 1 is a structural schematic diagram of a vehicle 1 according to an 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, 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 an embodiment of the present application. As shown in FIG. 2, the battery 2 includes a housing 20, a battery cell 6, and a protective plate 8. The battery cell 6 and the protective plate 8 are housed in 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, the first housing portion 201 and the second housing portion 202 are engaged with each other, and the first housing portion 201 together with the second housing portion 202 defines an accommodation space 203 for accommodating the battery cells 6. The second housing portion 202 may be a hollow structure with an opening at one end, the first housing portion 201 is a plate-like structure, and the first housing portion 201 is engaged with the opening side of the second housing portion 202 to form the housing 20 having the accommodation space 203, or the first housing portion 201 and the second housing portion 202 may both be hollow structures with an opening at one end, and the opening side of the first housing portion 201 is engaged with the opening side of the second housing portion 202 to form the housing 20 having the accommodation space 203. Of course, the first housing unit 201 and the second housing unit 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 to 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] In the battery 2, there are a plurality of battery cells 6. The plurality of battery cells 6 may be connected in series, in parallel, or in series-parallel, and the series-parallel connection means that some of the plurality of battery cells 6 are connected in series and some are connected in parallel. The plurality of battery cells 6 may be directly connected in series, in parallel, or in series-parallel, and then the entirety of the plurality of battery cells 6 may be 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 the battery module may be electrically connected to each other via bus bar members to realize parallel connection, series connection, or 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 an 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, and 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 case 621 is determined by the shape of the case 621 after one or more electrode assemblies 61 are assembled together, 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 to allow one or more electrode assemblies 61 to be disposed in the case 621. For example, in 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 communicates with 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, that is, the end surface does not have a 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. Each electrode terminal 63 is provided correspondingly with a connection unit 64 (which may also be called a current collecting unit 64), which 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] In the battery cell 6, a single battery assembly 61 or multiple battery assemblies 61 may be provided according to actual usage needs. As shown in FIG. 3, four independent battery assemblies 61 are provided in the battery cell 6.

[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, to relieve the internal pressure or temperature.

[0078] 4 is a schematic exploded view of a battery according to another embodiment of the present application. As shown in FIG. 4, the battery 2 includes a battery cell 6, a first wall of the battery cell 6 is provided with a pressure relief mechanism 65 and a protective plate 8, and the protective plate 8 is disposed opposite the pressure relief mechanism 65, where 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 has high temperature resistance and impact resistance.

[0081] In the above-mentioned technical solution, the pressure relief mechanism 65 is disposed opposite the pressure relief mechanism 65. In the event of thermal runaway occurring inside the battery cell 6, the protective plate 8, which is a polymer matrix composite fiber, can block the high-temperature and high-velocity gas-solid mixture released from the pressure relief mechanism 65, protect the battery case from airflow impact and high-temperature melting, and ensure the safety of the battery 2.

[0082] Optionally, the polymer matrix composite fibreboard is a fibre reinforced resin composite board.

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

[0084] Alternatively, as shown in FIG. 4, the battery cell 6 is housed in a housing 20, and the first wall is a wall of the battery cell 6 that is close to a top cover 201 of the housing 20 and faces the top cover 201.

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

[0086] In the above technical solution, the protective plate 8 is provided 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, can block the high-temperature and 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 protecting the safety of the battery 2.

[0087] 5 is a schematic half-sectional view of the battery case according to an embodiment of the present invention. As shown in FIG. 5, the protective plate 8 is optionally integrated 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 FIG. 5.

[0089] In the above 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 to better protect the safety of the battery 2. When the protective plate 8 functions solely as the top cover 201 of the battery 2, the protective plate 8 can maintain the protection of the top cover 201 of the battery 2 from high temperature and air flow impact, and can further simplify the structure of the battery 2 and reduce the production cost of the battery 2.

[0090] 6 is a schematic diagram of a top cover according to an embodiment of the present application. As shown in FIG. 6, when the protective plate 8 is integrally provided on the top cover 201, the top cover 201 may have an irregular shape. In the embodiment of the present application, the top cover 201 may have a square shape, a circular shape, etc., and the present application is not limited thereto. That is, in 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 protective plate 8 is provided between the top cover 201 and the first wall.

[0092] The protective 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 protective 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 provided between the top cover 201 and the pressure relief structure 65, so that the pressure relief structure 65 faces the top cover 201. In this way, the protective plate 8 can directly protect the top cover 201, and protect the top cover 201 facing the pressure relief structure 65 from the impact of high temperature and air flow, thereby ensuring the safety of the battery 2.

[0094] Continuing to refer to FIG. 4, optionally, the dimensions of the protective 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 the top cover 201 from the high-temperature and high-velocity gas-solid mixture released from the pressure relief mechanism 65, and also play a role in sealing the inside of the battery 2. And, 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 provided between the top cover 201 and the first wall where the pressure relief mechanism 65 is provided. When the dimension of the protective plate 8 is smaller than that of the top cover 201, the protective plate 8 can protect the top cover 201 to improve the safety performance of the battery 2, and can also reduce the production cost.

[0099] 8 is a schematic exploded view of a battery according to another embodiment of the present application. As shown in FIG. 8, optionally, the protective plate 8 is 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 Figure 8, or may be circular 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 casing 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 the effect of protecting the top cover 201 well, while minimizing the cost and avoiding the waste of materials in the non-protected 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 as long as they can be fixed together, the present application is not limited to these. In the actual production process, selecting a connection method that is simple and easy to use will be advantageous for widespread use in actual operations.

[0104] In the above technical solution, the connection between the protective plate 8 and the top cover 201 is realized by using bolts or adhesive, and the connection method is simple, easy to operate, and favorable 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 selectively 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, and the protective plate 8, which is a polymer matrix composite fiber, blocks the high-temperature and 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, and protecting the safety of the battery 2.

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

[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 two-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 temperature and air flow impact, and can further simplify the structure of the battery 2 and reduce the production cost 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, and 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 installation of the protective plate 8 in the battery 2, and it is sufficient that the protective plate 8 is present on the wall that directly faces the pressure relief mechanism 65 of the battery cell 6 in the battery 2, that is, the protective plate 8 may be 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, and the protective plate 8 may be provided at any position in the battery 2 depending on 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 protective 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 protective 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 to the pressure relief structure 65 from the impact of high temperature and air flow, 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 is used to contain a fluid and adjust the temperature of the battery cells 6. The fluid here 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 is used to contain a cooling fluid and 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 cooling liquid or a cooling gas. The thermal management member 66 may also be used to heat the battery cells 6 and increase their temperature, and the embodiment of the present application is not limited thereto. Optionally, the fluid may circulate to improve the effect of adjusting the temperature. Optionally, the fluid may be water, a mixture of water and ethylene glycol, air, etc.

[0117] In the above 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 temperature 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 for adjusting 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 to allow 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 exhaust from the battery cell 6 when the pressure relief mechanism 65 operates, allowing the exhaust 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 thermally conductive material and include a passage with a fluid. The fluid flows through the passage and transfers heat through the thermally conductive material to adjust the temperature of the battery cell 6. In the embodiment of the present application, the weak area 661 may only have a thermally conductive material and no fluid, and a thin layer of thermally conductive material is already formed and is easily broken by the discharge. For example, the side of the weak area 661 close to the bottom wall 202 may be a layer of thermally conductive material to form the weak area 661.

[0121] In the above 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, so as to protect the safety of the battery 2. By providing the thermal management member 66 between the first wall and the protective plate 8, the temperature of the battery cell 6 can be adjusted according to the actual needs of the battery cell 6 to ensure that the battery cell 6 functions normally. By providing the weak area 661 in the thermal management member 66, when the airflow impact or high temperature destroys the weak area 661, the discharged material can be quickly discharged through the weak area 661 and away from the battery cell 6, thereby reducing the risk of discharged material to 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-mentioned technical proposal, the housing 20 of the battery 2 can be protected from the impact of high-temperature and high-velocity airflow by adding a protective plate 8 between the first wall where the pressure relief mechanism 65 is provided and the housing 20. 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] Optionally, the air member 67 is an air intercalation layer.

[0125] The purpose of adding the insulating member 67 is to further reduce the temperature of the housing 20. When an air intervening layer is used as the insulating member 67, the transfer of heat 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 an embodiment of the present application. As shown in FIG. 12, optionally, the protective plate 8 includes multiple fiber-reinforced resin layers 81, and the fiber-reinforced resin layers 81 are formed by combining a fiber material and a resin material.

[0128] The present application does not limit the process of compounding 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 slurry of the resin material, allowing the slurry of the resin material to fully infiltrate the fiber pores 812 in the single fiber material layer 811, and then baking for 3 to 30 minutes at a temperature condition of 60°C to 120°C. The protective plate 8 is manufactured by stacking 1 to 20 layers of the fiber reinforced resin layer 81 and hot press forming them under a pressure condition of 0.1 to 10 MPa and a temperature condition of 100°C to 200°C.

[0129] The present application does not limit the manufacturing method of the slurry of the resin material. For example, in the embodiment of the present application, the slurry of the resin material may be composed of water-based elastic paint, resin material, flame retardant, dispersant, coupling agent, silica powder, and short fiber 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 the present application is a material with excellent acid resistance, mechanical properties, and heat resistance, and 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 resistant and impact resistant material, which is used to manufacture the protective plate 8 and is disposed between the pressure relief mechanism 65 and the housing 20. When the high temperature inside the battery cell 6 and the discharged materials fly out of the battery cell 6 at high speed, the protective plate 8 can protect the housing 20, protect the housing 20 from melting at high temperature and the impact of the discharged materials at high speed, and ensure 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 embodiments of the present application may be a silicone-based aerogel modified resin or a high-temperature resistant flame retardant resin.

[0134] In the above-mentioned technical solution, the material formed by compounding 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, ultra-high molecular weight polyethylene fiber, and the like.

[0136] Optionally, the fibrous material is a ceramic fibrous 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 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 the production cost can be reduced.

[0143] Optionally, the thickness of the protective 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 adopted, so that the protective plate 8 has high temperature resistance and impact resistance, and the production cost can be reduced.

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

[0146] The following examples of the present application are described. The examples described below are illustrative and are only for the purpose of interpreting the present application, and should not be understood as limitations on the present application. If no specific techniques or conditions are specified in the examples, they shall be carried out in accordance with the techniques, conditions or product instructions described in the literature of this field.

[0147] The protective plates made of fiber reinforced resin material were subjected to tensile performance tests, the test results of which are shown in Table 1, compression performance tests, the test results of which are shown in Table 2, bending performance tests, the test results of which are shown in Table 3, rib shear performance tests, the test results of which are shown in Table 4, and impact performance tests, the test 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 protective plate having a thickness of 3 mm, 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 the 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, any of 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 included in the claims. [Explanation of symbols]

[0155] 1 vehicle 2 batteries 6 Battery Cells 8 Protective plate 20. Cabinet 61 Electrode Assembly 62 Housing 63 Electrode terminal 64 Connection Units 65 Pressure relief mechanism 66 Thermal management components 67 Insulation 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. A battery comprising: a battery cell (6) having a pressure relief mechanism (65) on a first wall thereof; and a protective plate (8) which is a polymer matrix composite fiberboard and is disposed opposite the pressure relief mechanism (65).

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

3. The battery according to claim 1 or 2, characterized in that the battery cell (6) is housed in a housing (20), and the first wall is a wall located close to a top cover (201) of the housing (20) of the battery cell (6) and facing the top cover (201).

4. 4. The battery according to claim 3, wherein the protective plate (8) is integrally provided on the top cover (201).

5. 4. The battery according to claim 3, characterized in that the protective plate (8) is provided between the top cover (201) and the first wall.

6. 6. The battery according to claim 5, wherein the protective plate (8) and the top cover (201) have the same dimensions.

7. 6. The battery according to claim 5, characterized in that the dimensions of the protective plate (8) are smaller than those of the top cover (201).

8. 6. The battery according to claim 5, characterized in that 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).

9. The battery according to any one of claims 6 to 8, characterized in that the protective plate (8) is connected to the top cover (201) by bolts or adhesive.

10. The battery according to claim 1 or 2, characterized in that the battery cell (6) is housed in a housing (20), and the first wall is a wall located close to a bottom wall (202) of the housing (20) of the battery cell (6) and facing the bottom wall (202).

11. 11. The battery according to claim 10, wherein the protective plate (8) is integrally provided on a bottom wall (202) of the housing (20).

12. 11. The battery according to claim 10, characterized in that the guard plate (8) is provided between the bottom wall (202) and the first wall.

13. 13. The battery of claim 12, wherein a thermal management member (66) is provided between the protective plate (8) and the first wall, the thermal management member (66) being used to contain a fluid to regulate the temperature of the battery cells (6).

14. 14. The battery of claim 13, wherein 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 exhaust from the battery cell (6) when the pressure relief mechanism (65) is activated, thereby allowing the exhaust to pass through the weakened area (661).

15. 13. The battery according to claim 5 or 12, characterized in that a heat insulating member (67) is provided between the protective plate (8) and the housing (20).

16. 16. The battery of claim 15, wherein the insulating member (67) is an air gap.

17. The battery according to any one of claims 1 to 16, 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.

18. 18. The battery according to claim 17, wherein the resin material is a silicone-based aerogel modified resin or a high-temperature resistant flame-retardant resin.

19. 18. The battery of claim 17, wherein the fiber material is at least one of fibers such as 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.

20. 20. The battery of claim 19, wherein the fiber material is a ceramic fiber material.

21. 21. The battery of claim 20, wherein the ceramic fiber material is silica or alumina.

22. The battery according to any one of claims 17 to 21, characterized in that the thickness of the fiber material is 6 to 100 µm.

23. The battery according to any one of claims 1 to 22, characterized in that the thickness of the protective plate (8) is 0.2 to 5 mm.

24. A power consuming device comprising a battery (2) for providing power according to any one of claims 1 to 23.

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