Fireproof protective cover and battery module

Abstract

This application provides a fireproof protective cover and a battery module, relating to the field of battery technology. The battery module includes a housing, individual batteries installed within the housing, and a fireproof protective cover. The protective cover body is fixed to the housing. The battery module has an individual battery explosion-proof valve, with a flow guide hole corresponding to the individual battery explosion-proof valve. The fireproof protective cover includes a protective cover body and a protective plate. The protective plate is located on the side of the protective cover body away from the battery module and covers the flow guide hole. When the battery module is in normal operating condition, the protective plate covers the flow guide hole. When the individual battery explosion-proof valve explodes, an airflow channel is formed between the protective plate and the protective cover body. This improves the safety of passengers and belongings in the passenger compartment when the individual battery explosion-proof valve explodes.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a fireproof protective cover and a battery module. Background Technology

[0002] In existing technologies, battery modules are generally equipped with individual battery explosion-proof valves. One method is to set the individual battery explosion-proof valves upwards, that is, towards the battery pack cover and passenger compartment. When one or more individual batteries in the battery module experience thermal runaway, the individual battery explosion-proof valve explodes. Flames, high-temperature media, high-temperature gases, etc., with a certain impact force are sprayed directly from the explosion-proof valve towards the protective cover. The impact force of the gas can easily cause the protective cover to be punctured, directly spraying towards the battery pack cover and passenger compartment, igniting the vehicle and endangering the safety of passengers and their belongings in the passenger compartment. Summary of the Invention

[0003] This application provides a fireproof protective cover and a battery module, which can improve the situation where the explosion-proof valve of a single battery bursts, endangering the safety of passengers and belongings in the passenger compartment.

[0004] The embodiments of this application are implemented as follows:

[0005] In a first aspect, embodiments of this application provide a fireproof protective cover, which includes: a protective cover body and a protective plate;

[0006] The protective cover body is used to fix the battery module housing, and the protective cover body has a flow guide hole corresponding to the explosion-proof valve of the individual battery;

[0007] The protective plate is used to be placed on the side of the protective cover body away from the battery module and can cover the flow guide hole;

[0008] When the battery module is in normal working condition, the protective plate covers the air guide hole; when the explosion-proof valve of a single battery bursts open, there is an airflow channel between the protective plate and the protective cover body.

[0009] In the above technical solution, when the explosion-proof valve of a single battery bursts open, since there is an airflow channel between the protective plate and the protective cover body, the high-temperature airflow is ejected from the guide hole and then from the airflow channel. The airflow ejected from the airflow channel changes its direction of movement due to the obstruction of the protective plate, thereby reducing the danger to the occupants and items in the passenger compartment and improving the situation where the explosion-proof valve of a single battery bursts open and endangers the safety of the occupants and items in the passenger compartment.

[0010] In one possible implementation, the fireproof protective cover is provided with an elastic element that acts on the cover body and the protective plate to keep the protective plate covering the drainage hole and to overcome the elastic force of the elastic element when the protective plate moves away from the cover body.

[0011] In the above technical solution, the elastic element allows the protective plate to abut against the protective cover body, ensuring the battery module maintains normal operation. When the individual battery explosion-proof valve bursts, high-temperature gas can be ejected from the guide hole. When the jet force of the high-temperature gas is sufficiently large, it can cause the protective plate to move away from the protective cover body. As the protective plate gradually moves away from the protective cover body, the airflow channel between the protective plate and the protective cover body becomes larger, and the high-temperature gas can then be ejected from this airflow channel. The airflow ejected from this airflow channel changes its direction of movement due to the obstruction of the protective plate, and the protective plate needs to overcome the elastic force of the elastic element when moving away from the protective cover body. Therefore, the impact force of the high-temperature gas is reduced, thereby further reducing the danger to occupants and items in the passenger compartment and improving the safety of occupants and items in the passenger compartment when the individual battery explosion-proof valve bursts.

[0012] In one possible implementation, the elastic element is disposed on the side of the protective cover body away from the protective plate. When the protective plate covers the guide hole, the elastic element is in a compressed state or in its original state, and the elastic element is compressed when the protective plate moves away from the protective cover body.

[0013] In the above technical solution, the elastic element is set on the side of the protective cover body away from the protective plate, so there is a certain space between the protective cover body and the battery module. During the process of high temperature airflow being ejected, the space between the protective cover body and the battery module is conducive to the diffusion of high temperature airflow to buffer the ejection pressure of high temperature airflow and increase safety.

[0014] In one possible implementation, the protective plate has a connecting portion that passes through the protective plate and the protective cover body, an elastic element is sleeved on the connecting portion, and both ends of the connecting portion have protrusions.

[0015] In the above technical solution, since both ends of the connecting part have protrusions, the protective plate and the elastic element can be prevented from detaching. The connecting part passes through the protective plate and the protective cover body, and the elastic element is sleeved on the connecting part. The movement trajectory of the elastic element is relatively fixed, and the movement direction of the protective plate when it changes from the first state to the second state is also relatively fixed, reducing the probability of misalignment between the protective plate and the guide hole, thereby further reducing the danger to occupants and items in the passenger compartment.

[0016] In one possible implementation, an elastic element is disposed between the protective plate and the protective cover body, with the opposite ends of the elastic element connected to the protective plate and the protective cover body respectively. When the protective plate covers the guide hole, the elastic element is in a stretched state or in its original state, and the elastic element is stretched when the protective plate moves away from the protective cover body.

[0017] In one possible implementation, the protective plate has a first protrusion facing the protective cover body, and when the protective plate covers the guide hole, the first protrusion abuts against the protective cover body.

[0018] In the above technical solution, by having the first protrusion abut against the protective cover body, the contact area between the protective plate and the protective cover body is reduced, which reduces the probability of an adsorption reaction caused by the large area contact between the protective plate and the protective cover body. This is because if the protective plate and the protective cover body cannot separate due to the adsorption effect when the single battery explosion valve bursts, the airflow cannot be discharged from the airflow channel.

[0019] In one possible implementation, the first contact surface of the first protrusion that abuts against the protective cover body is an arc surface.

[0020] In the above technical solution, the first contact surface of the first protrusion is an arc surface, which can further reduce the contact area between the protective plate and the protective cover body. At the same time, the arc surface can also better ensure that the protective plate abuts against the protective cover body.

[0021] In one possible implementation, the first protrusion is annular.

[0022] In the above technical solution, the annular first protrusion ensures that there is virtually no gap between the protective cover body and the protective plate. When the explosion-proof valve of a single battery cell in another battery module bursts, the high-temperature gas flow cannot enter the battery module from between the first protrusion and the protective cover body, further increasing the safety of the entire battery pack.

[0023] Secondly, this application provides a battery module, which includes a housing, a single battery installed in the housing, and a fireproof protective cover according to the first aspect embodiment. The protective cover body is fixed to the housing, and the battery module has a single battery explosion-proof valve, with a flow guide hole corresponding to the single battery explosion-proof valve.

[0024] In the above technical solution, the protective cover body is fixed to the shell. When the explosion-proof valve of the single battery bursts open, since there is an airflow channel between the protective plate and the protective cover body, the high-temperature airflow can be ejected from the guide hole and then ejected from the airflow channel. The airflow ejected from the airflow channel changes its direction of movement due to the obstruction of the protective plate, thereby reducing the danger to the occupants and items in the passenger compartment and improving the situation where the explosion-proof valve of the single battery bursts open and endangers the safety of the occupants and items in the passenger compartment.

[0025] In one possible implementation, the housing includes a flexible circuit board having mounting holes, a single-cell explosion-proof valve located in the mounting holes, and a protective cover body having an extension extending along the edge of a flow guide hole toward a side closer to the flexible circuit board. The diameter of the flow guide hole is smaller than the diameter of the mounting holes, and the extension is at least partially located in the mounting holes.

[0026] In the above technical solution, since the diameter of the guide hole is smaller than the diameter of the mounting hole, and the extension is at least partially located in the mounting hole, when the explosion-proof valve of the single battery bursts open, the extension can shield the flexible circuit board, reducing the chance of the flexible circuit board being burned. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the battery module structure according to an embodiment of this application;

[0029] Figure 2 This is an exploded view of the battery module according to an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the fireproof protective cover according to an embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the structure of the protective cover body according to an embodiment of this application;

[0032] Figure 5 This is a schematic diagram illustrating the cooperation between the protective plate and the elastic element in an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of the fireproof protective cover from a first-view perspective under the normal operating state of the battery module according to an embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the fireproof protective cover from a second perspective under the normal operating state of the battery module according to an embodiment of this application.

[0035] Figure 8 This is a schematic diagram of the fireproof protective cover from a first-view perspective when the explosion-proof valve of a single battery in an embodiment of this application bursts open;

[0036] Figure 9 This is a schematic diagram of the fireproof protective cover from a second perspective when the explosion-proof valve of a single battery explodes according to an embodiment of this application.

[0037] Figure 10 This is a schematic diagram of the screw structure according to an embodiment of this application.

[0038] Icons: 100-Battery module; 10-Fireproof protective cover; 11-Protective cover body; 111-Drainage hole; 112-Extension; 113-First mounting part; 1131-First mounting hole; 114-First bolt; 115-First folding part; 116-Second mounting hole; 117-Second bolt; 12-Protective plate; 121-First protrusion; 1211-First abutting surface; 122-Connecting part; 1221-Screw; 1221a-Protrusion; 1222-Nut; 13-Elastic element; 14-Airflow channel; 21-Flexible circuit board; 211-Connector; 212-Third mounting hole; 22-Module pull plate; 23-Module end plate; 231-First bracket; 2311-First receiving cavity; 232-Second bracket; 2321-Second receiving cavity; 40-Single battery explosion-proof valve. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this application, it should be noted that the terms "inner" and other designations indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These designations are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] This application provides a battery module 100. Please refer to... Figure 1 and Figure 2 The battery module 100 includes a housing, individual batteries installed inside the housing, and a fireproof protective cover 10.

[0045] Exemplarily, the housing includes two opposing module pull plates 22, two opposing module end plates 23, and a flexible circuit board 21. The two ends of the module pull plates 22 are respectively connected to the two module end plates 23. The flexible circuit board 21 is provided with a connector 211, and the module end plates 23 are provided with a first bracket 231 and a second bracket 232. The first bracket 231 has a first receiving cavity 2311, and the connector 211 is snapped into the first receiving cavity 2311. This arrangement prevents the connector 211 from being pulled out during low-voltage wiring harness insertion and removal. The second bracket 232 is provided with a second receiving cavity 2321, and the battery module 100 has a busbar disposed in the second receiving cavity 2321.

[0046] In addition, the battery module 100 is equipped with a single cell explosion-proof valve 40. When a single cell experiences thermal runaway, the single cell explosion-proof valve 40 will burst open and spray out a high-temperature gas flow with a certain impact force. The high-temperature gas flow contains gas, solid and liquid media.

[0047] Please refer to Figures 2-5 The fireproof protective cover 10 of this application embodiment includes a protective cover body 11 and a protective plate 12. The protective cover body 11 is fixed to the housing of the battery module 100, and the protective cover body 11 has a guide hole 111 corresponding to the explosion-proof valve 40 of the single battery.

[0048] For example, each end of the protective cover body 11 has a first mounting portion 113, and the first mounting portion 113 has a first mounting hole 1131. A first bolt 114 passes through the first mounting hole 1131 and is connected to the module end plate 23 to fix the protective cover body 11. Optionally, the protective cover body 11 has a first folding portion 115 extending into the battery module 100 and a second mounting hole 116. The first folding portion 115 can fit against the surface of the module pull plate 22, and a second bolt 117 passes through the second mounting hole 116 to connect to the module pull plate 22 to better fix the protective cover body 11.

[0049] The protective plate 12 is disposed on the side of the protective cover body 11 away from the battery module 100 and can cover the flow guide hole 111. When the battery module 100 is in normal working condition, the protective plate 12 covers the flow guide hole 111 (see reference). Figure 6 and Figure 7 When the explosion-proof valve 40 of a single battery explodes, there is an airflow channel 14 between the protective plate 12 and the protective cover body 11 (see reference). Figure 8 and Figure 9 ).

[0050] When the single-cell explosion-proof valve 40 bursts open, because there is an airflow channel 14 between the protective plate 12 and the protective cover body 11, the high-temperature airflow is ejected from the guide hole 111 and then from the airflow channel 14. The airflow ejected from the airflow channel 14 changes its direction of movement due to the obstruction of the protective plate 12, thereby reducing the danger to the occupants and items in the passenger compartment and improving the situation where the single-cell explosion-proof valve 40 bursts and endangers the safety of the occupants and items in the passenger compartment.

[0051] In one possible implementation, the flexible circuit board 21 has a third mounting hole 212, the single-cell battery explosion-proof valve 40 is located in the third mounting hole 212, and the protective cover body 11 has an extension 112 that extends along the edge of the guide hole 111 toward the side closer to the flexible circuit board 21. The diameter of the guide hole 111 is smaller than the diameter of the third mounting hole 212, and the extension 112 is at least partially located in the third mounting hole 212 (see reference). Figure 2 , Figure 7 and Figure 9 ).

[0052] Since the diameter of the guide hole 111 is smaller than the diameter of the third mounting hole 212, and the extension 112 is at least partially located in the third mounting hole 212, when the single-cell explosion-proof valve 40 bursts, the extension 112 can shield the flexible circuit board 21, reducing the chance of the flexible circuit board 21 being burned.

[0053] In one possible implementation, the fireproof protective cover 10 is provided with an elastic element 13, which acts on the protective cover body 11 and the protective plate 12 to keep the protective plate 12 covering the guide hole 111, and to make the protective plate 12 move away from the protective cover body 11 by overcoming the elastic force of the elastic element 13.

[0054] In this embodiment, the protective cover body 11 is fixed to the housing of the battery module 100. Under the action of the elastic member 13, the protective plate 12 can hold the protective cover body 11 so that the battery module 100 maintains a normal working state. Since the guide hole 111 corresponds to the single-cell battery explosion-proof valve 40, when the single-cell battery explosion-proof valve 40 bursts, the high-temperature airflow can be ejected from the guide hole 111. When the jet force of the high-temperature airflow is large enough, the protective plate 12 can move away from the protective cover body 11. As the protective plate 12 gradually moves away from the protective cover body 11, the airflow channel 14 between the protective plate 12 and the protective cover body 11 will become larger and larger, and the high-temperature airflow can be ejected through the airflow channel 14. The airflow ejected from the airflow channel 14 changes direction due to the obstruction of the protective plate 12. When the protective plate 12 moves away from the protective cover body 11, it needs to overcome the elastic force of the elastic member 13. As a result, the impact force of the high-temperature airflow will be reduced, thereby further reducing the danger to the occupants and items in the passenger compartment and improving the situation where the explosion-proof valve 40 of the single battery could endanger the safety of the occupants and items in the passenger compartment when it explodes.

[0055] For example, the elastic element 13 is disposed on the side of the protective cover body 11 away from the protective plate 12. When the protective plate 12 covers the guide hole 111, the elastic element 13 is in a compressed state or in its original state, and the elastic element 13 is compressed when the protective plate 12 moves to the side away from the protective cover body 11.

[0056] like Figure 6 and Figure 7 As shown, the protective plate 12 is positioned above the protective cover body 11. When the protective plate 12 covers the guide hole 111, the elastic element 13 is in its original or compressed state, both of which allow the protective plate 12 to abut against the protective cover body 11. Figure 8 and Figure 9 As shown, when the protective plate 12 moves away from the protective cover body 11, the elastic element 13 is compressed. The protective plate 12 needs to overcome the elastic force of the elastic element to reduce the impact force when the high-temperature airflow is ejected, thereby improving safety. Since the elastic element 13 is located on the side of the protective cover body 11 away from the protective plate 12, there is a certain space between the protective cover body 11 and the battery module 100. Therefore, during the ejection of the high-temperature airflow, the space between the protective cover body 11 and the battery module 100 is conducive to the diffusion of the high-temperature airflow to buffer the ejection pressure of the high-temperature airflow, thereby further increasing safety.

[0057] For example, the protective plate 12 has a connecting portion 122, which passes through the protective plate 12 and the protective cover body 11. The elastic member 13 is sleeved on the connecting portion 122, and both ends of the connecting portion 122 have protrusions 1221a.

[0058] Since both ends of the connecting portion 122 have protrusions 1221a, the protective plate 12 and the elastic member 13 can be prevented from dislodging. The connecting portion 122 passes through the protective plate 12 and the protective cover body 11, and the elastic member 13 is sleeved on the connecting portion 122. The movement trajectory of the elastic member 13 is relatively fixed, and the movement direction of the protective plate 12 when it changes from the first state to the second state is also relatively fixed, which reduces the probability of misalignment between the protective plate 12 and the guide hole 111, thereby further reducing the danger to occupants and items in the passenger compartment.

[0059] For example, the connecting part 122 includes a screw 1221 (see reference). Figure 10 The protective plate 12 and the protective cover body 11 are connected by a screw rod 1221 through the screw rod 1222 and the nut 1222. The end of the screw rod 1221 away from the nut 1222 has a radially protruding portion 1221a. The outer diameter of the nut 1222 is larger than the outer diameter of the screw rod 1221. Thus, the nut 1222 and the protruding portion 1221a of the screw rod 1221 can restrict the protective plate 12 and the elastic telescopic member 132 from dislodging. The connection of the screw rod 1221 and the nut 1222 allows for easy disassembly and installation.

[0060] In other embodiments, the nut 1222 may be omitted, and a threaded hole may be opened in the protective plate 12. A screw 1221 may be passed through the threaded hole of the protective cover body 11 and the protective plate 12, and the screw 1221 may be threadedly engaged with the threaded hole to achieve a fixing effect.

[0061] In one possible implementation, both the protective cover body 11 and the protective plate 12 are mica sheets.

[0062] Mica sheets possess excellent high-temperature resistance, capable of withstanding temperatures up to 1500℃. Both the protective cover body 11 and the protective plate 12 are made of mica sheets. When diffused high-temperature media lands on the protective cover body 11 or the protective plate 12, it will not ignite or burn through them, thus preventing thermal runaway of other individual batteries. Furthermore, the mica sheets of the protective cover body 11 and the protective plate 12 provide a certain degree of rigidity, ensuring that the elastic element 13 can be compressed or stretched when the individual battery's explosion-proof valve 40 explodes. This prevents the elastic element 13 from being unable to be compressed or stretched, which could lead to deformation or displacement of the protective cover and subsequent protection failure.

[0063] It should be noted that in other embodiments, the protective cover body 11 and the protective plate 12 may also be made of high-temperature resistant metal material.

[0064] In another possible implementation, the elastic element 13 can be positioned between the protective plate 12 and the protective cover body 11, with its opposite ends connected to the protective plate 12 and the protective cover body 11, respectively. When the protective plate 12 covers the guide hole 111, the elastic element 13 is in a stretched or original state, and when the protective plate 12 moves away from the protective cover body 11, the elastic element 13 is stretched. This arrangement also allows the protective plate 12 to abut against the protective cover body 11 to cover the guide hole 111, and requires the protective plate 12 to overcome the elastic force of the elastic element 13 when moving away from the protective cover body 11.

[0065] Furthermore, the inventors of this application discovered during their research that, under normal operating conditions of the battery module 100, if the contact area between the protective plate 12 and the protective cover body 11 is large, the protective plate 12 and the protective cover body 11 may adhere too tightly. When the single-cell explosion-proof valve 40 bursts, the protective plate 12 and the protective cover body 11 are not easily detached due to the adhesion effect, preventing airflow from exiting through the airflow channel 14 and causing safety issues. Based on this, the inventors of this application designed the following structure:

[0066] In one possible implementation, the protective plate 12 has a first protrusion 121 (see reference). Figures 5-9 The first protrusion 121 is disposed facing the protective cover body 11, and the first protrusion 121 abuts against the protective cover body 11 when the battery module 100 is in normal working condition.

[0067] By having the first protrusion 121 abut against the protective cover body 11, the contact area between the protective plate 12 and the protective cover body 11 is reduced, thus reducing the probability of an adsorption reaction caused by the large-area contact between the protective plate 12 and the protective cover body 11. This ensures that when the single-cell explosion-proof valve 40 explodes, the protective plate 12 can move away from the protective cover body 11, so that there is an airflow channel 14 between the protective plate 12 and the protective cover body 11.

[0068] Optionally, the first protrusion 121 is annular. The annular first protrusion 121 ensures that there is essentially no gap between the protective cover body 11 and the protective plate 12. When the explosion-proof valve 40 of a single battery in another battery module 100 explodes, the high-temperature gas flow cannot enter the battery module 100 from between the first protrusion 121 and the protective cover body 11, further increasing the safety of the entire battery pack. It is understood that in other embodiments, the first protrusion 121 may also be intermittent.

[0069] For example, the first contact surface 1211 of the first protrusion 121 that abuts against the protective cover body 11 is an arc surface.

[0070] The first contact surface 1211 of the first protrusion 121 is an arc surface, which can further reduce the contact area between the protective plate 12 and the protective cover body 11. At the same time, compared with the first protrusion 121 being arranged in an inverted triangle, the arc surface arrangement can better ensure that the protective plate 12 abuts against the protective cover body 11.

[0071] In another possible implementation, the protective cover body 11 may be provided with a second protrusion (not shown in the figure), the second protrusion is provided around the flow guide hole 111, the second protrusion is provided facing the protective plate 12, and the second protrusion abuts against the protective plate 12 when the battery module 100 is in normal working condition.

[0072] By having the second protrusion abut against the protective plate 12, the contact area between the protective plate 12 and the protective cover body 11 is reduced, thus reducing the probability of an adsorption reaction occurring due to large-area contact between the protective plate 12 and the protective cover body 11.

[0073] Optionally, the second protrusion can also be configured as annular or intermittent. The annular second protrusion can make the protective cover body 11 and the protective plate 12 basically without gaps. When the explosion-proof valve 40 of the individual battery of other battery modules 100 bursts, the high-temperature gas flow ejected cannot enter the battery module 100 from between the second protrusion and the protective plate 12, thereby further increasing the safety of the entire battery pack.

[0074] For example, the second contact surface of the second protrusion that abuts against the protective plate 12 is an arc surface.

[0075] The second contact surface of the second protrusion is curved, which can further reduce the contact area between the protective plate 12 and the protective cover body 11. At the same time, the curved surface of the second contact surface can also better ensure that the protective plate 12 abuts against the protective cover body 11.

[0076] In summary, the fireproof protective cover 10 and battery module 100 provided in this application embodiment allow high-temperature airflow to be ejected from the guide hole 111 when the single battery explosion-proof valve 40 bursts open. The jet force of the high-temperature airflow causes the protective plate 12 to move away from the protective cover body 11. The high-temperature airflow can be ejected from the gap between the protective plate 12 and the protective cover body 11. The airflow ejected from the airflow channel 14 changes its direction of movement due to the obstruction of the protective plate 12, thereby reducing the danger to passengers and items in the passenger compartment and improving the situation where the single battery explosion-proof valve 40 endangers the safety of passengers and items in the passenger compartment when it bursts open.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fire protection cover, characterized in that It includes: The protective cover body is used to fix the battery module housing. The protective cover body has a flow guide hole corresponding to the explosion-proof valve of the single battery. The protective cover body and the battery module are spaced apart. as well as A protective plate, which is disposed on the side of the protective cover body away from the battery module and can cover the flow guide hole; When the battery module is in normal working condition, the protective plate covers the air guide hole; when the explosion-proof valve of the single battery bursts open, there is an airflow channel between the protective plate and the protective cover body; The fireproof protective cover is provided with an elastic element. The elastic element is located on the side of the protective cover body away from the protective plate, or the elastic element is located between the protective plate and the protective cover body. The elastic element acts on the protective cover body and the protective plate, so that the protective plate covers the guide hole under normal working conditions, and when the single battery explosion-proof valve bursts, the protective plate is subjected to gas pressure to overcome the elastic force and move away from the protective cover body, so as to form an airflow channel between the protective plate and the protective cover body. The protective plate has a first protrusion, which faces the protective cover body. When the protective plate covers the flow guide hole, the first protrusion abuts against the protective cover body.

2. The fireproof protective cover according to claim 1, characterized in that, When the elastic element is disposed on the side of the protective cover body away from the protective plate, the elastic element is in a compressed state or original state when the protective plate covers the guide hole, and the elastic element is compressed when the protective plate moves away from the protective cover body.

3. The fireproof protective cover according to claim 2, characterized in that, The protective plate has a connecting part that passes through the protective plate and the protective cover body. The elastic element is sleeved on the connecting part, and both ends of the connecting part have protrusions.

4. The fireproof protective cover according to claim 1, characterized in that, When the elastic element is disposed between the protective plate and the protective cover body, the opposite ends of the elastic element are respectively connected to the protective plate and the protective cover body. When the protective plate covers the guide hole, the elastic element is in a stretched state or in its original state, and the elastic element is stretched when the protective plate moves away from the protective cover body.

5. The fireproof protective cover according to claim 1, characterized in that, The first contact surface of the first protrusion that abuts against the protective cover body is an arc surface.

6. The fireproof protective cover according to claim 5, characterized in that, The first protrusion is annular.

7. A battery module, characterized in that, The battery module includes a housing, a single battery cell installed in the housing, and a fireproof protective cover as described in any one of claims 1 to 6. The protective cover body is fixed to the housing. The battery module has a single battery cell explosion-proof valve, and the flow guide hole is correspondingly provided with the single battery cell explosion-proof valve.

8. The battery module according to claim 7, characterized in that, The housing includes a flexible circuit board with mounting holes. The single-cell battery explosion-proof valve is located in the mounting holes. The protective cover body has an extension that extends along the edge of the flow guide hole toward the side close to the flexible circuit board. The diameter of the flow guide hole is smaller than the diameter of the mounting hole, and the extension is at least partially located in the mounting hole.

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