Battery module and electric equipment

Abstract

The embodiment of the utility model provides a battery module and electric equipment. The battery module comprises a shell, a battery core assembly, an air inlet valve and an exhaust valve, the shell is provided with a containing cavity, an air inlet hole and an exhaust hole, and the air inlet hole and the exhaust hole can both communicate with the containing cavity. The battery core assembly is arranged in the accommodating cavity; the intake valve includes an open state for opening the intake hole and a closed state for closing the intake hole. The exhaust valve includes an open state for opening the exhaust hole and a closed state for closing the exhaust hole. When the air inlet valve is in the open state, the air inlet hole is used for allowing inert gas to enter the containing cavity, so that the amount of oxygen existing in the containing cavity is reduced. According to the technical scheme provided by the embodiment of the utility model, the probability of explosion and combustion of the battery core assembly is reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a battery module and electrical equipment. Background Technology

[0002] Currently, rechargeable batteries are becoming increasingly popular due to their recyclability. For example, they can be used in portable electronic products such as mobile phones and laptops, or in mobile products such as electric bicycles and electric vehicles. However, the use of rechargeable batteries also poses safety hazards, namely, they are prone to overheating and burning or exploding. Current technology typically involves extinguishing the flames after the rechargeable battery has burned or exploded, rather than intervening in the combustion or explosion in advance. Utility Model Content

[0003] This utility model provides a battery module and electrical equipment, which aims to reduce the probability of battery cell assembly explosion and combustion.

[0004] In a first aspect, embodiments of the present invention provide a battery module, comprising:

[0005] The outer casing is provided with a receiving cavity, an air inlet, and an exhaust outlet, both of which are able to communicate with the receiving cavity;

[0006] The battery cell assembly is disposed within the accommodating cavity;

[0007] An intake valve includes an open state for opening the intake port and a closed state for closing the intake port; and

[0008] An exhaust valve includes an open state for opening the exhaust port and a closed state for closing the exhaust port;

[0009] When the air intake valve is in the open state, the air intake port is used to allow inert gas to enter the accommodating cavity, thereby reducing the amount of oxygen present in the accommodating cavity.

[0010] Optionally, the housing includes:

[0011] The housing has the accommodating cavity, the air inlet and the exhaust port, and the housing also has an opening communicating with the accommodating cavity;

[0012] A cover, which is disposed over the opening.

[0013] Optionally, the cover is provided with a conductive element, which is electrically connected to the battery cell assembly.

[0014] Optionally, the cover and the housing are integrally formed; or, the cover and the housing are separate parts.

[0015] Optionally, the housing further includes:

[0016] A first sealing element is disposed between the cover and the housing to seal the connection between the cover and the housing.

[0017] Optionally, the cover and / or the housing are provided with a groove, and the first seal engages with the groove.

[0018] Optionally, the air inlet and the air outlet are located on opposite sides of the housing.

[0019] Optionally, the air inlet and the air outlet are arranged opposite each other along the length of the housing.

[0020] Optionally, the battery module further includes a second seal, through which the air intake valve is connected to the housing; and / or

[0021] The battery module also includes a third seal, and the vent valve is connected to the housing through the third seal.

[0022] Optionally, a gas concentration detector is further provided in the accommodating cavity, which is used to detect the gas concentration in the accommodating cavity.

[0023] Optionally, the battery module further includes:

[0024] A bracket, wherein the battery cell assembly is mounted on the bracket, and the bracket is disposed in the receiving cavity;

[0025] The protection board includes a main board and the gas concentration detector. The main board is connected to the bracket and located between the bracket and the housing. The gas concentration detector is connected to the main board and located between the main board and the housing.

[0026] Secondly, embodiments of the present invention provide an electrical device, including the battery module as described in the first aspect.

[0027] The battery module and electrical device provided in this embodiment of the utility model, by opening an air inlet and an air outlet on the outer shell to connect the accommodating cavity, allow inert gas to enter the accommodating cavity through the air inlet when the air inlet valve is in the open state, while the gas originally in the accommodating cavity is discharged outside the accommodating cavity through the air outlet valve in the open state, reducing the amount of oxygen in the accommodating cavity. Then, the air inlet and air outlet valves are switched to the closed state, so that the amount of oxygen in the accommodating cavity is kept within a low range. The battery cell assembly is located in the accommodating cavity, that is, the battery cell assembly can work in a low oxygen environment. When the battery cell assembly malfunctions during use and its temperature rises, the probability of the battery cell assembly exploding and burning is reduced because the battery cell assembly is in a low oxygen environment. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a battery module provided in an embodiment of the present utility model;

[0030] Figure 2 A partial cross-sectional view of a battery module provided in an embodiment of this utility model;

[0031] Figure 3 A half-sectional view of a battery module provided for an embodiment of this utility model.

[0032] Explanation of key figure labels:

[0033] 10. Outer shell; 10a. Receptacle; 10b. Air inlet; 10c. Exhaust outlet; 10d. Opening; 11. Housing; 111. Base plate; 112. First side plate; 113. Second side plate; 114. Handle; 12. Cover; 121. Conductive component; 12a. Groove; 13. First seal; 20. Air inlet valve; 30. Exhaust valve; 40. Second seal; 50. Third seal; 60. Bracket; 70. Protective plate; 71. Main board; 72. Gas concentration detector. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figures 1 to 3In a first aspect, this utility model provides a battery module, which includes a housing 10, a cell assembly (not shown), an intake valve 20, and an exhaust valve 30. The housing 10 has a accommodating cavity 10a, an intake port 10b, and an exhaust port 10c, both of which are connected to the accommodating cavity 10a. The cell assembly is disposed within the accommodating cavity 10a. The intake valve 20 includes an open state for opening the intake port 10b and a closed state for closing the intake port 10b. The exhaust valve 30 includes an open state for opening the exhaust port 10c and a closed state for closing the exhaust port 10c. When the intake valve 20 is in the open state, the intake port 10b is used to allow inert gas to enter the accommodating cavity 10a, thereby reducing the amount of oxygen present in the accommodating cavity 10a.

[0036] In this embodiment, the battery module has an air inlet 10b and an exhaust 10c connected to the accommodating cavity 10a on the outer casing 10. When the air inlet valve 20 is open, inert gas can enter the accommodating cavity 10a through the air inlet 10b, while the gas in the accommodating cavity 10a is discharged outside the accommodating cavity 10a through the exhaust valve 30, which is in the open state, thus reducing the amount of oxygen in the accommodating cavity 10a. Then, the air inlet valve 20 and the exhaust valve 30 are switched to the closed state, so that the accommodating cavity 10a contains inert gas and has a low amount of oxygen. The battery cell assembly is located in the accommodating cavity 10a, so that the battery cell assembly can work in a low-oxygen environment. When the battery cell assembly malfunctions during use and its temperature rises, the probability of the battery cell assembly exploding and burning is reduced because the battery cell assembly is in a low-oxygen environment.

[0037] For example, during the battery module manufacturing process, when inert gas enters the accommodating cavity 10a through the air inlet 10b, the air inlet valve 20 and the air outlet valve 30 are controlled to be in the open state. When the content of inert gas in the accommodating cavity 10a reaches a preset level, or when the oxygen content in the accommodating cavity 10a is lower than a preset level, the air inlet valve 20 and the air outlet valve 30 are controlled to be in the closed state. After the battery module manufacturing process is completed, the air inlet valve 20 and the air outlet valve 30 are closed to prevent inert gas leakage.

[0038] Specifically, after assembling the outer casing 10, the battery cell assembly, the inlet valve 20, and the exhaust valve 30, the inlet valve 20 and the gas tank containing inert gas are connected through the first transmission pipe. The inlet valve 20 and the exhaust valve 30 are controlled to be in the open state, so that the inert gas in the gas tank enters the accommodating space through the open inlet port 10b, while the gas originally in the accommodating cavity 10a is discharged outside the accommodating cavity 10a through the open exhaust port 10c. When the content of inert gas in the accommodating cavity 10a reaches the preset content, or when the oxygen content in the accommodating cavity 10a is lower than the preset content, the exhaust valve 30 and the inlet valve 20 are controlled to switch to the closed state. Finally, the first transmission pipe is removed from the inlet valve 20.

[0039] For example, inert gases include, but are not limited to, at least one of the following: nitrogen, carbon dioxide, etc.

[0040] For example, the housing 10 may be made of at least one material selected from plastic, metal, etc., without specific limitation.

[0041] Please see Figure 3 In some embodiments, the outer casing 10 includes a housing 11 and a cover 12. The housing 11 has a receiving cavity 10a, an air inlet 10b, and an exhaust outlet 10c, and the housing 11 also has an opening 10d communicating with the receiving cavity 10a. The cover 12 covers the opening 10d. It is understood that when assembling the battery module, the battery cell assembly can be installed into the receiving cavity 10a through the opening 10d and then the cover 12 can be placed over the opening 10d to protect the battery cell assembly. The housing 11 has a larger area, which makes it easier to open the air inlet 10b and the exhaust outlet 10c without affecting other components of the battery module.

[0042] like Figure 2 As shown, the housing 11 includes a base plate 111 and a plurality of side plates connected to the outer periphery of the base plate 111. The plurality of side plates include a first side plate 112 and a second side plate 113 spaced apart along the length direction of the housing 10, and a third side plate and a fourth side plate connecting the first side plate 112 and the second side plate 113. The base plate 111 and the plurality of side plates enclose a receiving cavity 10a.

[0043] Furthermore, a conductive element 121 is provided on the cover 12, and the conductive element 121 is electrically connected to the battery cell assembly. By providing the conductive element 121 on the cover 12, it is convenient to connect and disconnect the conductive element 121 from the battery cell assembly. The housing 11 is provided with an air inlet 10b and an exhaust 10c to prevent the placement of the air inlet 10b and the exhaust 10c from affecting the electrical connection between the battery cell assembly and the conductive element 121.

[0044] For example, such as Figure 1As shown, the conductive element 121 includes a first conductive element and a second conductive element, which are spaced apart. One end of the first conductive element and the second conductive element are electrically connected to the battery cell assembly, and the other end is electrically connected to an external electrical device, so that the battery cell assembly can form a current loop with the external electrical device and the battery cell assembly can supply power to the external electrical device.

[0045] In some embodiments, the cover 12 and the housing 11 are integrally formed. By making the cover 12 and the housing 11 integrally formed, it is beneficial to make a stable connection between the cover 12 and the housing 11, and at the same time, the sealing between the cover 12 and the housing 11 is better, which can effectively prevent inert gas from leaking from the cover 12 and the housing 11.

[0046] For example, after the cover 12 and the shell 11 are manufactured separately, the cover 12 and the shell 11 are integrated by a hot-melt process, or by a welding process.

[0047] In some embodiments, the cover 12 and the housing 11 are separate components. This facilitates the connection and disassembly of the cover 12.

[0048] For example, the cover 12 and the housing 11 can be connected by fasteners, or the cover 12 and the housing 11 can be connected by snap-fit, or the cover 12 and the housing 11 can be glued together.

[0049] Furthermore, the outer casing 10 also includes a first sealing element 13, which is disposed between the cover 12 and the housing 11. The first sealing element 13 is used to seal the connection between the cover 12 and the housing 11, improve the sealing between the cover 12 and the housing 11, and prevent inert gas from leaking between the cover 12 and the housing 11.

[0050] For example, the first seal 13 includes, but is not limited to, sealant and sealing ring.

[0051] For example, the first seal 13 includes a sealant, which, by applying the sealant to the connection between the cover 12 and the housing 11, ensures the sealing between the cover 12 and the housing 11 while connecting the cover 12 and the housing 11.

[0052] For example, the first seal 13 includes a sealing ring. After the first seal 13 is fitted onto the outer periphery of the housing 11, it connects the housing 11 and the cover 12, so that the first seal 13 is located between the cover 12 and the cover 12, thereby achieving a seal between the cover 12 and the housing 11.

[0053] In some embodiments, the cover 12 and / or the housing 11 are provided with a groove 12a, and the first seal 13 is engaged in the groove 12a. By engaging the first seal 13 in the groove 12a, the contact between the first seal 13 and the external environment is reduced, the risk of damage to the first seal 13 is lowered, and the groove 12a can also fix the first seal 13, preventing the first seal 13 from falling off or moving, improving the sealing between the cover 12 and the housing 11, and preventing inert gas from leaking between the cover 12 and the housing 11.

[0054] For example, the groove 12a is an annular groove, and the first seal 13 is an annular seal. The first seal 13 is engaged with the groove 12a, so that the first seal 13 continuously seals the various connections between the cover 12 and the shell 11, thereby improving the sealing effect.

[0055] For example, such as Figure 3 As shown, the cover 12 is provided with a groove 12a, and the side of the shell 11 with an opening 10d extends into the groove 12a, which helps to position the cover 12 and the shell 11.

[0056] like Figure 1 and Figure 2 As shown, in some embodiments, a handle 114 is also provided on the outer periphery of the housing 11. In this way, the user can hold the handle 114 to carry the battery module, improving portability.

[0057] Specifically, the housing 11 has handles 114 on both opposite sides along its length.

[0058] In some embodiments, the air inlet 10b and the exhaust 10c are located on opposite sides of the housing 10. It is understood that the opposite arrangement of the air inlet 10b and the exhaust 10c allows the inert gas to flow more effectively through the entire accommodating cavity 10a, venting the original gas in the accommodating cavity 10a to the outside of the accommodating cavity 10a, thereby improving efficiency while achieving gas replacement.

[0059] For example, such as Figure 3 As shown, the first side plate 112 of the housing 11 is provided with an air inlet 10b, and the second side plate 113 of the housing 11 is provided with an exhaust port 10c, so that the air inlet 10b and the exhaust port 10c are arranged opposite to each other.

[0060] For example, such as Figure 2 As shown, the air inlet 10b is located in the middle region of the first side plate 112, facilitating the inert gas entering the accommodating cavity 10a through the open air inlet 10b and then diffusing in all directions to fill the accommodating cavity 10a. The exhaust port 10c is located in the middle region of the second side plate 113, facilitating the flow of gas from all directions within the accommodating cavity 10a to the exhaust port 10c and then dissipating through the open exhaust port 10c.

[0061] In some embodiments, the air inlet 10b and the exhaust port 10c are arranged opposite to each other along the length of the housing 10. It is understood that the housing 10 has a large dimension along its length. By arranging the air inlet 10b and the exhaust port 10c opposite to each other along the length of the housing 10, the distance between the air inlet 10b and the exhaust port 10c is greater. This allows the inert gas to enter the accommodating cavity 10a through the air inlet 10b and then travel a longer path to reach the exhaust port 10c, preventing the inert gas from directly exiting through the exhaust port 10c after entering the accommodating cavity 10a and thus failing to achieve the purpose of gas exchange.

[0062] For example, the length direction of the housing 10 is as follows Figure 1 As shown in the Y direction.

[0063] For example, such as Figure 1 As shown, the outer casing 10 can be a rectangular casing 10, whose length dimension is greater than its width dimension and its height dimension. Specifically, the width dimension of the outer casing 10 is as follows: Figure 1 As shown in the X direction, the height direction of the outer casing 10 is as follows: Figure 1 As shown in the Z direction.

[0064] For example, a cell assembly may include one or more cells. When a cell assembly includes multiple cells, the multiple cells may be arranged sequentially along the length of the housing 10.

[0065] like Figure 3 As shown, in some embodiments, the intake valve 20 can be inserted through the intake port 10b and connected to the wall of the intake port 10b by welding, gluing, or snap-fitting to facilitate the installation and fixation of the intake valve 20. Alternatively, the intake valve 20 can be connected to the housing 10 through a second transmission pipe to achieve communication with the intake port 10b.

[0066] In some embodiments, the battery module further includes a second seal 40, through which the intake valve 20 is sealed to the housing 10, thereby achieving a sealed connection between the intake valve 20 and the housing 10 and preventing inert gas from leaking between the intake valve 20 and the housing 10.

[0067] For example, the second seal 40 includes, but is not limited to, sealant and sealing ring.

[0068] For example, the second seal 40 includes a sealing ring, the second seal 40 is sleeved on the outer periphery of the intake valve 20, the intake valve 20 and the second seal 40 pass through the intake hole 10b, and the second seal 40 abuts against the inner wall surface of the intake hole 10b.

[0069] In some embodiments, the intake valve 20 may be a manual intake valve, which can be manually operated to switch between an open state and a closed state.

[0070] In some embodiments, the intake valve 20 can be a one-way valve. When it is connected to the gas tank through the first transmission pipe, the inert gas in the gas tank flows to the intake valve 20. The pressure of the inert gas causes the intake valve 20 to switch to the open state, and the inert gas can enter the accommodating cavity 10a from the intake port 10b. When the intake valve 20 is in the closed state, the gas in the accommodating cavity 10a cannot be discharged through the intake valve 20, which can prevent the inert gas from leaking from the intake valve 20.

[0071] like Figure 3 As shown, in some embodiments, the exhaust valve 30 can be inserted through the exhaust hole 10c and connected to the wall of the exhaust hole 10c by welding, gluing, or snap-fitting to facilitate the installation and fixation of the exhaust valve 30. Alternatively, the exhaust valve 30 can be connected to the housing 10 through a third transmission pipe to achieve communication with the exhaust hole 10c.

[0072] In some embodiments, the battery module further includes a third seal 50, through which the exhaust valve 30 is sealed to the housing 10, thereby achieving a sealed connection between the exhaust valve 30 and the housing 10 and preventing inert gas from leaking between the exhaust valve 30 and the housing 10.

[0073] For example, the third seal 50 includes, but is not limited to, sealant and sealing ring.

[0074] For example, the third seal 50 includes a sealing ring, the third seal 50 is sleeved on the outer periphery of the exhaust valve 30, the exhaust valve 30 and the third seal 50 pass through the exhaust hole 10c, and the third seal 50 abuts against the inner wall surface of the exhaust hole 10c.

[0075] In some embodiments, the exhaust valve 30 may be a manual exhaust valve, which can be manually operated to switch between an open state and a closed state.

[0076] In some embodiments, when the intake valve 20 and exhaust valve 30 are in the open state, inert gas enters the accommodating cavity 10a through the intake port 10b and remains there for a preset time. Then, the intake valve 20 and exhaust valve 30 are controlled to switch to the closed state. It is understood that by setting a preset time, when the inert gas continuously enters the accommodating cavity 10a through the intake port 10b for the preset time, it is determined that the inert gas content in the accommodating cavity 10a has reached a preset content, thereby enabling the intake valve 20 and exhaust valve 30 to switch to the closed state, preventing inert gas leakage.

[0077] In some embodiments, a gas concentration detector 72 is also provided inside the accommodating cavity 10a. The gas concentration detector 72 is used to detect the gas concentration inside the accommodating cavity 10a. It can be understood that by detecting the gas concentration inside the accommodating cavity 10a by the gas concentration detector 72, it is possible to determine whether the content of inert gas has reached a preset content based on the detection result, thereby enabling corresponding control of the battery module.

[0078] For example, when the intake valve 20 is in the open state and inert gas enters the accommodating cavity 10a through the intake port 10b, the gas concentration detector 72 can detect the gas concentration in the accommodating cavity 10a. After determining that the content of inert gas has reached the preset content based on the detection result, it can stop controlling the inert gas to enter the accommodating cavity 10a through the intake port 10b and switch the intake valve 20 and exhaust valve 30 to the closed state.

[0079] For example, during the use of the battery module, the content of inert gas may change. The gas concentration detector 72 can detect the gas concentration in the accommodating cavity 10a and determine whether the content of inert gas has reached the preset content based on the detection result. When the content of inert gas is lower than the preset content, the battery module can issue a prompt.

[0080] Furthermore, the battery module also includes a bracket 60 and a protection board 70. The battery cell assembly is mounted on the bracket 60, which is located within the receiving cavity 10a. The protection board 70 includes a main board 71 and a gas concentration detector 72. The main board 71 is connected to the bracket 60 and located between the bracket 60 and the housing 11, while the gas concentration detector 72 is connected to the main board 71 and located between the main board 71 and the housing 11. Understandably, during battery module assembly, the battery cell assembly can be mounted on the bracket 60, and the protection board 70 can be connected to the bracket 60. The battery cell assembly and the protection board 70 are then placed together with the bracket 60 within the receiving cavity 10a, facilitating battery module assembly.

[0081] For example, such as Figure 2 As shown, the housing 11 includes a base plate 111 and a plurality of side plates connected to the outer periphery of the base plate 111. The plurality of side plates include a first side plate 112 and a second side plate 113 spaced apart along the length of the housing 11, and a third side plate and a fourth side plate connecting the first side plate 112 and the second side plate 113. The first side plate 112 is provided with an air inlet 10b, the second side plate 113 is provided with an exhaust 10c, and the main plate 71 may be located between the first side plate and the third side plate.

[0082] For example, the motherboard 71 can communicate with an external terminal device. After obtaining the gas concentration detected by the gas concentration detector 72, the motherboard 71 can transmit it to the external terminal device so that the user can view it and control the battery module accordingly. For example, when filling the accommodating cavity 10a with inert gas, after obtaining the current gas concentration in the accommodating cavity 10a, the user can determine whether the content of inert gas has reached the preset content. If so, the user can control the intake valve 20 and the exhaust valve 30 to switch to the closed state.

[0083] In some embodiments, the motherboard 71 is further provided with a temperature detection circuit for detecting the temperature of the battery cell assembly. When the temperature of the battery cell assembly is greater than or equal to a preset temperature, the motherboard 71 can cut off the charging and discharging path of the battery cell assembly to further prevent the battery cell assembly from exploding or burning.

[0084] Secondly, this utility model provides an electrical device including a battery module from any of the above embodiments. In the electrical device of the above embodiments, an air inlet 10b and an exhaust 10c are provided on the outer casing 10 of the battery module, connecting a accommodating cavity 10a. When the air inlet valve 20 is open, inert gas can enter the accommodating cavity 10a through the air inlet 10b, while the gas already in the accommodating cavity 10a is discharged through the exhaust valve 30, which is in the open state, reducing the amount of oxygen in the accommodating cavity 10a. Then, the air inlet valve 20 and the exhaust valve 30 are switched to the closed state, so that the accommodating cavity 10a contains inert gas with a low oxygen content. The battery cell assembly is located within the accommodating cavity 10a, allowing the battery cell assembly to operate in a low-oxygen environment. When the battery cell assembly malfunctions during use and its temperature rises, the probability of the battery cell assembly exploding or burning is reduced because it is in a low-oxygen environment.

[0085] For example, electrical equipment includes, but is not limited to, at least one of the following: ships, automobiles, audio systems, etc.

[0086] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A battery module, characterized in that, include: The outer casing is provided with a receiving cavity, an air inlet, and an exhaust outlet, both of which are able to communicate with the receiving cavity; The battery cell assembly is disposed within the accommodating cavity; An intake valve includes an open state for opening the intake port and a closed state for closing the intake port; as well as An exhaust valve includes an open state for opening the exhaust port and a closed state for closing the exhaust port; When the air intake valve is in the open state, the air intake port is used to allow inert gas to enter the accommodating cavity, thereby reducing the amount of oxygen present in the accommodating cavity.

2. The battery module according to claim 1, characterized in that, The outer casing includes: The housing has the accommodating cavity, the air inlet and the exhaust port, and the housing also has an opening communicating with the accommodating cavity; A cover, which is disposed over the opening.

3. The battery module according to claim 2, characterized in that, The cover is provided with a conductive element, which is electrically connected to the battery cell assembly.

4. The battery module according to claim 2, characterized in that, The cover and the shell are integrally formed; or the cover and the shell are separate parts.

5. The battery module according to claim 4, characterized in that, The outer casing also includes: A first sealing element is disposed between the cover and the housing to seal the connection between the cover and the housing.

6. The battery module according to claim 5, characterized in that, The cover and / or the housing are provided with a groove, and the first seal is engaged with the groove.

7. The battery module according to any one of claims 1-6, characterized in that, The air inlet and the air outlet are located on opposite sides of the housing.

8. The battery module according to claim 7, characterized in that, The air inlet and the air outlet are arranged opposite each other along the length of the outer casing.

9. The battery module according to any one of claims 1-6, characterized in that, The battery module further includes a second seal, and the air intake valve is connected to the housing through the second seal; and / or The battery module also includes a third seal, and the vent valve is connected to the housing through the third seal.

10. The battery module according to any one of claims 1-6, characterized in that, The cavity is also equipped with a gas concentration detector, which is used to detect the gas concentration in the cavity.

11. The battery module according to claim 2, characterized in that, The battery module also includes: A bracket, wherein the battery cell assembly is mounted on the bracket, and the bracket is disposed in the receiving cavity; The protection board includes a main board and a gas concentration detector. The main board is connected to the bracket and located between the bracket and the housing. The gas concentration detector is connected to the main board and located between the main board and the housing.

12. An electrical appliance, characterized in that, Includes the battery module as described in any one of claims 1-11.

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