Patent ID: 12218378

DETAILED DESCRIPTION

The implementations of the present disclosure will be described in further detail below in conjunction with the accompanying drawings and embodiments. The detailed description of the following embodiments and drawings are used to exemplarily illustrate the principle of the present disclosure, rather than used to limit the scope of the present disclosure. That is, the present disclosure is not limited to the described embodiments.

In the description of the present disclosure, it should be stated, unless otherwise specified, “a plurality of” refers to two or more; and the directions or positional relationships indicated by the terms such as “upper”, “lower”, “left”, “right”, “inner”, “outside” and the like, are only for the convenience of describing the present disclosure and simplifying the description, and do not mean or imply that the involved device or element must have a specific orientation or must be configured or operated in the specific orientation, therefore, they cannot be understood as limiting the present disclosure. In addition, the terms “first”, “second”, “third” and the like are only used for descriptive purposes, and should not be interpreted as indicating or implying relative importance. The term “perpendicular” need not be strictly perpendicular, but allows for an allowable amount of error. The term “parallel” need not be strictly parallel, but allows for an allowable amount of error.

The orientation terms appearing in the following description refer to the directions shown in the drawings, and are not intended to limit the specific structure of the present disclosure. In the description of the present disclosure, it should also be stated, unless otherwise specified and limited, the terms “mounted”, “connected to”, “connected with” or the like should be understood in a broad sense. For example, a connection may refer to a fixed connection or a disassembly connection; or may refer to an integral connection; or may refer to a direct connection or an indirect connection through an intermediate medium. For the ordinary person skilled in the art, the specific meanings of the above terms in the present disclosure may be understood according to specific situations.

After considering the problem that the battery in its entirety will quickly catch fire and then explode once a thermal runaway occurs in the battery, the applicant has conducted research and analysis on the various structures and use environments of the battery. The applicant found, when a thermal runaway occurs in one battery module of the battery, other battery modules that have not undergone thermal runaway are often quickly affected, resulting in the fire and then explosion of other battery modules that have not undergone thermal runaway in a very short period of time, and eventually resulting in the fire and then explosion of the battery in its entirety. In order to avoid the explosion of the entire battery caused by the thermal runaway of one battery module, the applicant carried out cooling process on the battery module that is undergoing thermal runaway, but the applicant found that the temperature of the battery module after undergoing the thermal runaway rose rapidly, and it was difficult to suppress the spread of thermal runaway only by cooling process. The applicant found that the key to suppressing the spread of thermal runaway is to discharge the high-temperature gas accumulated in the battery in time after the thermal runaway of the battery module is found, so as to quickly reduce the temperature of the battery and prevent the spread of thermal runaway.

In view of the above problems found by the applicant, the applicant has improved the structure of the battery, and the embodiments of the present disclosure will be further described below.

In order to better understand the present disclosure, the embodiments of the present disclosure are described below in conjunction withFIG.1toFIG.13.

An embodiment of the present disclosure provides an electric device using the battery10as a power source. The electric device can be, but not limited to, a vehicle, a ship, an aircraft, or the like. Referring toFIG.1, the embodiment of the present disclosure provides a vehicle1. The vehicle1may be a fuel vehicle, a gas vehicle, a new energy vehicle, or the like. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, or the like. In the embodiment of the present disclosure, the vehicle1may include a motor1a, a controller1band a battery10. The controller1bis configured to control the battery10to supply power to the motor1a. The motor1ais connected to the wheels through a transmission mechanism, thereby driving the vehicle1to travel. The battery10may be used as a driving power source of the vehicle1to provide driving power for the vehicle1in place of or partially in place of fuel or natural gas. In an example, the battery10may be provided at the bottom, front or rear of the vehicle1. The battery10may be configured to power the vehicle1. In an example, the battery10may be used as an operating power source of the vehicle1for the electrical circuit system of the vehicle1. Optionally, the battery10may be configured to satisfy the operating power requirements of the vehicle1when starting, navigating and running.

Referring toFIG.2, the battery10may include two or more battery modules20. In some optional embodiments, the battery10further includes a casing30. The casing30includes an accommodating space. The battery module20is disposed within the accommodating space of the casing30. The casing30may provide a mounting platform for the battery module20, and may also provide protection for the battery module20. The two or more battery modules20are arranged inside the casing30. The two or more battery modules20may be arranged side by side along one direction, so as to make full use of the accommodating space of the casing30.

Referring toFIG.2, the battery10further includes a guide member40. The flow guide member40is arranged inside the casing30. The flow guide member40is disposed corresponding to the battery module20. The number of the flow guide members40may be equal to the number of the battery modules20, that is, one flow guide member40is corresponding to one battery module20. The flow guide member40and the casing30are of split structures, namely, they are disposed separately from each other, so they are independently processed and manufactured and are then assembled together.

Referring toFIG.3, the battery module20may include two or more battery cells22, but the number of the battery cells22included in the battery module20is not limited here. In each battery module20, the two or more battery cells22may be connected in series, in parallel or in a mixed manner. The two or more battery cells22may be arranged side by side along one direction. The arrangement direction of the two or more battery cells22may be perpendicular to the arrangement direction of various battery modules20.

Referring toFIG.3, the battery module20includes an explosion-proof assembly21. In the embodiment where the battery module20includes the two or more battery cells22, the explosion-proof assembly21may be an explosion-proof valve disposed on each battery cell22. When the internal pressure inside the battery cell22is too excessive, the explosion-proof valve will be destroyed, so the gas inside the battery cell22will be released through the destroyed explosion-proof valve. The gas released from the battery cell22is in a high-temperature and high-pressure state. In some other embodiments, the battery module20has an outer housing (not shown in the figure) and an explosion-proof valve disposed on the outer housing. The two or more battery cells22are arranged inside the outer housing. The explosion-proof assembly21may be an explosion-proof valve provided on the outer housing. When the internal pressure inside the battery cell22is too excessive, the gas will be released from the battery cell22into the inner space inside the outer housing. When the pressure inside the outer housing reaches a preset pressure value, the explosion-proof valve on the outer housing will be destroyed, and the gas inside the outer housing will be released through the destroyed explosion-proof valve. The gas released from the outer housing is in a high-temperature and high-pressure state.

Referring toFIG.2andFIG.3, the casing30includes a gas discharge passage31. The gas discharge passage31includes a gas inlet311and a gas outlet312. The gas discharge passage31is in communication with the accommodating space inside the casing30through the gas inlet311. The gas discharge passage31is in communication with an external environment through the gas outlet312. The gas discharge passage31functions to guide the flow of gas. When the battery module20undergoes thermal runaway and releases high-temperature and high-pressure gas, the gas may enter the gas discharge passage31from the gas inlet311of the gas discharge passage31, and finally may be directionally discharged from the gas outlet312to the external environment by means of the guidance of the gas discharge passage31, thereby reducing the possibility of explosion of the battery10due to the accumulation of a large amount of gas released by the thermal runaway of the battery module20.

Referring toFIG.4toFIG.6, a flow guide member40is disposed inside the casing30and shields the explosion-proof assembly21to form a gas guide passage50. The explosion-proof assembly21is disposed corresponding to the gas guide passage50. The gas guide passage50is in communication with the gas inlet311of the gas discharge passage31. The gas guide passage50is configured to guide the gas generated by the battery module20after the explosion-proof assembly21is destroyed, to the gas discharge passage31, and guide the gas to the outside of the casing30through the gas outlet312of the gas discharge passage31, so the gas inside battery10can be quickly discharged and depressurized, thereby preventing the spread of thermal runaway and reducing the possibility of explosion. Since the flow guide member40shields the explosion-proof assembly21, the flow guide member40can isolate the explosion-proof assembly21from the casing30, so the gas released after the explosion-proof assembly21is destroyed will be blocked by the flow guide member40, reducing the possibility that the casing30is rapidly melted due to the gas directly impacting on the casing30. Along the arrangement direction of the battery cells22, the battery module20has two opposite ends. The gas discharge passage31is disposed in a region of the casing30corresponding to one end of the battery module20. It can be understood that the regions of casing30corresponding to the both ends of the battery module20are provided with gas discharge passages31, respectively, so the gas can be discharged in two directions, thereby facilitating improving the efficiency of discharging gas from the casing30. The extending direction of the flow guide member40is the same as the arrangement direction of the battery cells22.

The battery10according to the embodiment of the present disclosure includes the casing30, the battery modules20, and the flow guide member40. The battery modules20and the flow guide member40are disposed inside the casing30. The battery module20includes the explosion-proof assembly21. When the thermal runaway occurs in the battery module20, the explosion-proof assembly21can be destroyed, so the battery module20can release internal gas through the destroyed explosion-proof assembly21. The flow guide member40shields the explosion-proof assembly21of the battery module20to form the gas guide passage50. The gas guide passage50can guide the gas to flow toward the gas discharge passage31along a predetermined path. Then, the gas will be quickly discharged from the casing30through the gas discharge passage31. The gas guide passage50and the gas discharge passage31can be provided to guide the directional flow of the gas. In this way, the possibility can be reduced that other battery modules20that have not undergone thermal runaway catch fire and then explode due to the gas released by the battery module20that has undergone thermal runaway spreading freely to the surroundings, thereby improving the use safety of the battery10.

In some embodiments, as shown inFIG.5andFIG.6, the gas guide passage50is enclosed and formed by the flow guide member40and the battery modules20, and the explosion-proof assembly21may be disposed in the gas guide passage50. Therefore, when a thermal runaway occurs, the gas released from the explosion-proof assembly21can directly enter the gas guide passage50, and can be guided by the gas guide passage50to the gas discharge passage31, thereby further reducing the possibility of the gas escaping from the gas guide passage50and spreading to the battery module20outside the gas guide passage50, and improving the gas discharging efficiency.

In some embodiments, as shown inFIG.7, the flow guide member40includes a first plate41and a second plate42. The first plate41is configured to shield the explosion-proof assembly21to isolate the explosion-proof assembly21from the casing30. The second plate42extends from the first plate41toward the battery module20. The gas guide passage50is enclosed and formed by the first plate41, the second plate42and the battery module20. The first plate41can block the gas from the front of the explosion-proof assembly21of the battery module20, and the second plate42can block the gas from the side of the explosion-proof assembly21. Therefore, the first plate41and the second plate42can effectively block the flow of the gas from different directions, respectively, thereby effectively guiding the gas to flow along the gas guide passage50, reducing the possibility of the spread of the gas freely to the surroundings, and improving the gas discharging efficiency. In an example, as shown inFIG.7toFIG.9, the flow guide member40includes the first plate41and two second plates42. Along the arrangement direction of the battery modules20, the two second plates42are spaced from each other, the two second plates42are disposed on the same side of the first plate41, and the flow guide member40has a U-shaped structure as a whole. A chamber formed by the first plate41and the two second plates42can form the gas guide passage50together with the battery module20. In an example, the first plate41and the second plates42are integrally formed. It can be understood that the number of the second plates42may also be three or more. Along the arrangement direction of the battery modules20, the three or more second plates42are spaced from each other. The two adjacent second plates42and a portion of the first plate41forms one chamber. Two or more chambers may form the gas guide passage50together with the battery module20.

In some embodiments, as shown inFIG.10, the gas inlet311of the gas discharge passage31in the casing30is located on one side of the battery module20, and the gas guide passage50extends to the end of the battery module20. Therefore, a distance is formed between the gas guide passage50and the gas inlet311of the gas discharge passage31. The battery module20further includes a connecting piece60. The connecting piece60includes a gas flow passage61for guiding the flow of gas. The connecting piece60is configured to be connected to the flow guide member40. Therefore, the gas flowing out from the gas guide passage50can directly enter the gas flow passage61of the connecting piece60. The gas guide passage50is in communication with the gas inlet311of the gas discharge passage31through the gas flow passage61of the connecting piece60. During the process of gas flowing from the gas guide passage50into the gas discharge passage31, the gas flow passage61of the connecting piece60can assist in guiding the gas, thereby facilitating reducing the possibility that the gas spreads freely to the surroundings after the gas is discharged from the gas guide passage50and before entering the gas discharge passage31.

In an example, the connecting piece60and the flow guide member40are integrally formed. Therefore, the connecting piece60and the flow guide member40may be seamlessly connected, thereby reducing the possibility of the gas escaping from a gap existing at the connection between the connecting piece60and the flow guide member40, the gap being caused by the split design of the connecting piece60and the flow guide member40. The connecting piece60may have the same cross-sectional shape as the flow guide member40. Alternatively, the connecting piece60may also have a cylindrical structure. Therefore, the gas flowing out from the gas guide passage50can directly enter the gas flow passage61of the connecting piece60, and then enter the gas discharge passage31under the guidance of the gas flow passage61, thereby reducing the possibility that the gas will spread freely to the surroundings after the gas is discharged from the gas guide passage50before entering the gas discharge passage31.

In some embodiments, as shown inFIG.10, the casing30includes a cover32. The explosion-proof assembly21of the battery module20is disposed facing the cover32. The flow guide member40is configured to be connected to the cover32. The flow guide member40is disposed between the cover32and the battery module20. When the battery module20undergoes thermal runaway and releases gas from the destroyed explosion-proof assembly21, the gas will not directly act on the cover32due to being blocked by the flow guide member40, thereby reducing the possibility of damage to the cover32caused by the gas directly impacting the cover32. For example, if the battery10is applied to the vehicle1, the cover32of the casing30faces the passenger compartment. If the cover32of the casing30is damaged, the gas may quickly enter the passenger compartment to cause injury to the passengers within the vehicle. The battery module20of the present embodiment can reduce the possibility of damage to the cover32by providing the flow guide member40, thereby reducing the possibility of gas rapidly invading the passenger compartment through the damaged cover32to cause injury to the passengers, and leaving more time for occupants to get out of vehicle1.

In some embodiments, as shown inFIG.10, the casing30further includes a housing33. The housing33is configured to accommodate the battery modules20. The housing33includes a side plate331. The cover32is connected to the side plate331. The cover32may be connected to the side plate331by fasteners and may be sealingly connected with the side plate331. An accommodating portion70is formed at the connection position of the cover32and the side plate331. The accommodating portion70has an opening facing the flow guide member40. The gas discharge passage31is provided on the side plate331, and the gas inlet311is in communication with the accommodating portion70. The gas outlet312of the gas discharge passage31is located on the surface of the side plate331on the side away from the battery module20. At least portion of the connecting piece60is located inside the accommodating portion70. The gas flow passage61of the connecting piece60is in communication with the gas inlet311of the gas discharge passage31. In this way, the connecting piece60located in the accommodating portion communicates the gas guide passage50with the gas inlet311of the gas discharge passage31. Therefore, the gas exchange position of the gas guide passage50and the gas inlet311of the gas discharge passage31is located at the accommodating portion70, thereby reducing the possibility of the gas escaping and directly entering the casing30during the exchange process. In an example, the surface of the side plate331connected to the cover32is flat, and the cover32has a flange connected with the side plate331and a concave portion recessed away from the battery module20. The flow guide member40and the connecting piece60are located in the concave portion of the cover32. After the cover32and the side plate331are connected, the accommodating portion70is formed between the concave portion of the cover32and the surface of the side plate331connected to the cover32. In this embodiment, as shown inFIG.6andFIG.10, the side plate331includes an upper portion, a first side portion, and a second side portion, the first side portion and the second side portion are each connected to the upper portion and are spaced apart from each other in a thickness direction of the side plate331, the second side portion is disposed away from the battery module20relative to the first side portion, the gas inlet311of the gas discharge passage31is disposed to penetrate the upper portion, and the gas outlet312of the gas discharge passage31is disposed to penetrate the second side portion. The accommodating portion70is formed above the gas inlet311of the gas discharge passage31and communicates the gas guide passage50with the gas inlet311of the gas discharge passage31such that a gas exchange between the gas guide passage50and the gas inlet311of the gas discharge passage31occurs at the accommodating portion70.

In some embodiments, as shown inFIG.10, the housing33further includes a support plate333. The side plate331and the support plate333are connected with each other. The battery modules20are disposed on the support plate333.

In some embodiments, as shown inFIG.10, the gas discharge passage31further includes a confluence chamber313. Both the gas inlet311of the gas discharge passage31and the gas outlet312of the gas discharge passage31are in communication with the confluence chamber313. The number of the gas inlets311is the same as the number of the flow guide members40. The number of the connecting pieces60is the same as the number of the flow guide members40. One gas inlet311is in communication with one gas flow passage61of the connecting piece60. When thermal runaway occurs in the battery module20, the gas generated by the battery module20is confluent to the confluence chamber313through the corresponding gas inlet311, and then discharged from the gas outlet312. After the confluence chamber313is provided, the confluence chamber313can accommodate more gas, and the pressure will decrease rapidly after the gas enters the confluence chamber313, so the gas within the casing30can enter the gas discharge passage31through the gas inlet311more quickly, and then the gas can quickly leave the accommodating space of the casing30, thereby further reducing the possibility of a sharp increase in the internal pressure inside the casing30due to the inability of the gas to be quickly discharged from the casing30.

In some embodiments, as shown inFIG.10andFIG.11, the flow guide member40and the casing30may be detachably connected or connected by welding. The flow guide member40includes the first plate41and the second plate42. The first plate41is detachably connected to the cover32. For example, the first plate41may be connected to the cover32by screws or rivets. In this way, when the extent of the damage to the first plate41and the second plate42of the flow guide member40is low due to a region where the thermal runaway occurs in the battery module20being small, the flow guide member40can be removed from the cover32and can be replaced with a new flow guide member40, so the cover32is not needed to be replaced as a whole. Alternatively, the first plate41is welded to the cover32. For example, the first plate41may be connected to the cover32by laser welding. In this way, the first plate41is directly welded to the cover32, making the structure formed by the first plate41and the cover32more compact, thereby reducing the space occupancy rate and improving the energy density of the battery10.

In some embodiments, as shown inFIG.10andFIG.11, the battery10further includes a sealing member80. The sealing member80is configured to seal the gas guide passage50, such that all the gas can flow to the gas inlet311of the gas discharge passage31along the gas guide passage50. The gas guide passage50has an outlet corresponding to the gas inlet311of the gas discharge passage31. The sealing member80is configured to seal the region of the gas guide passage50except the outlet. The provision of the sealing member80can reduce the possibility of gas escaping from other positions of the gas guide passage50during the process of entering the gas inlet311of the gas discharge passage31. The material of the sealing member80is selected from high-temperature resistant and impact resistant materials. The sealing member80may have a sheet-like structure. In an example, as shown inFIG.10, the sealing member80is disposed between the battery module20and the side plate331. On one hand, the possibility can be reduced that the gas cannot be discharged in time due to the gas entering the gap between the battery module20and the side plate331. On the other hand, the possibility can be reduced that other battery modules20catch fire and then explode due to the gas entering the gap between the battery module20and the side plate331and spreading to the other battery modules20through the gap. In another example, as shown inFIG.11, the sealing member80is disposed between the flow guide member40and the battery module20, to reduce the possibility of the gas escaping from the gap between the flow guide member40and the battery module20during the process of the gas entering the gas inlet311of the gas discharge passage31. For example, the flow guide member40includes the first plate41and the second plate42. The first plate41is configured to shield the explosion-proof assembly21to isolate the explosion-proof assembly21from the casing30. The second plate42extends from the first plate41toward the battery module20. The gas guide passage50is enclosed and formed by the first plate41, the second plate42and the battery module20. The sealing member80is disposed between the second plate42and the battery module20.

In some embodiments, as shown inFIG.12, the housing33includes two side plates331which are spaced from each other and a connecting plate332. The two side plates331are spaced from each other along the arrangement direction of the battery cells22. The connecting plate332is configured to connect the two side plates331. The battery modules20are disposed between the two side plates331. The gas guide passage50extends from one side plate331toward the other side plate331. The gas guide passage50has two opposite outlets. The two side plates331are each provided with the gas discharge passage31. The two outlets of the gas guide passage50correspond to the gas discharge passages31on the two side plates331, respectively. The gas generated when the thermal runaway occurs in the battery module20can flow to the gas discharge passages31on two sides through the two outlets of the gas guide passage50, thereby facilitating improving the gas discharging efficiency, and reducing the possibility that the gas is accumulated in the casing30for a long period to cause other battery modules20to explode due to the gas spreading to the other battery modules20or to cause battery10in its entirety to explode due to the rapid rise in pressure instantaneously. In an example, as shown inFIG.11andFIG.12, the number of the battery modules20is the same as the number of the flow guide members40, and one battery module20is provided correspondingly with one flow guide member40. One flow guide member40and one battery module20form one gas guide passage50. One flow guide member40is configured to independently guide the gas generated after the explosion-proof assembly21of one battery module20is destroyed. The means in which one battery module20is provided correspondingly with one flow guide member40, can effectively separate various battery modules20from each other, so the gas generated when the thermal runaway occurs in each battery module20is not prone to spreading to other battery modules20, improving effectively the safety of the battery10.

In some embodiments, as shown inFIG.12andFIG.13, the battery10further includes a pressure relief valve90. The pressure relief valve90is disposed on the second side portion of the side plate331and covers the gas outlet312of the gas discharge passage31. The casing30includes the side plate331and the connecting plate332. The pressure relief valve90is detachably connected to the second side portion of the side plate331of the casing30. For example, the pressure relief valve90is connected to the side plate331by screws. The pressure relief valve90is configured to be actuated to relieve the pressure when the pressure or temperature within the gas discharge passage31reaches a threshold value. The gas generated when the thermal runaway occurs in the battery module20inside the casing30is guided to the gas discharge passage31through the gas guide passage50, and then the pressure relief valve90is actuated under the action of the gas and is thus switched from a normally closed state to an open state, thereby ensuring that the gas can be timely and quickly discharged to the external environment through the pressure relief valve90. When the battery10is in a normal working state, since the pressure relief valve90in the normally closed state covers the gas outlet312of the gas discharge passage31, the pressure relief valve90can prevent liquid water and impurities from entering the interior of the casing30through the gas discharge passage31, thereby reducing the possibility that liquid water and impurities have adverse effects on the battery module20. In an example, the pressure relief valve90may be a one-way valve.

The battery10according to the embodiment of the present disclosure includes the casing30, the battery modules20, and the flow guide member40. The battery modules20and the flow guide member40are both disposed inside the casing30. The casing30includes the gas discharge passage31. The flow guide member40and the casing30are of split structures. The flow guide member40shields the explosion-proof assembly21of the battery module20. When the thermal runaway occurs in the battery module20, the explosion-proof assembly21will be destroyed to release high-temperature and high-pressure gas. The gas guide passage50can guide the gas released from the explosion-proof assembly21to the gas discharge passage31, and then the gas can be discharged to the outside of the casing30through the gas discharge passage31. In this way, the gas generated when the thermal runaway occurs in the battery module20will flow along a predetermined direction and be discharged out of the casing30, so the gas is not prone to flowing and spreading to the surroundings in the casing30, thereby effectively reducing the possibility that other battery modules20catch fire and then explode due to the gas spreading to other battery modules20, facilitating improving the use safety of the battery10.

An embodiment of the present disclosure also provides a manufacturing method of the battery10, including:disposing the battery module20including the explosion-proof assembly21inside the casing30including the gas discharge passage31, the gas discharge passage31including the gas inlet311and the gas outlet312; anddisposing the flow guide member40inside the casing30and shielding the explosion-proof assembly21to form the gas guide passage50, the gas guide passage50being in communication with the gas inlet311, for guiding the gas generated by the battery module20to an exterior of the casing30through the gas outlet312after the explosion-proof assembly21is destroyed.

In some embodiments, the casing30includes the cover32and the housing33. The cover32is connected to the housing33. In the step of disposing the battery module20including the explosion-proof assembly21inside the casing30including the gas discharge passage31, the battery module20is disposed inside the housing33, and then the cover32is covered onto the housing33. The gas discharge passage31is disposed on the housing33. In the step of disposing the flow guide member40inside the casing30and shielding the explosion-proof assembly21to form the gas guide passage50, the flow guide member40is connected and fixed to the cover32in advance, and then the cover32is covered onto the housing33. The flow guide member40shields the explosion-proof assembly21, and the gas guide passage50is enclosed and formed by the flow guide member40and the battery module20.

In the battery10manufactured by the manufacturing method of the battery10according to the embodiment of the present disclosure, the flow guide member40shields the explosion-proof assembly21of the battery module20. The gas guide passage50and the gas discharge passage31may guide the gas to flow along the predetermined path. In this way, the provision of the gas guide passage50and the gas discharge passage31can reduce the possibility that other battery modules20that have not undergone thermal runaway catch fire and then explode due to the gas released by the battery module20that has undergone thermal runaway spreading freely to the surroundings, thereby improving the use safety of the battery10.

An embodiment of the present disclosure also provide a manufacturing system of battery10, including:a first assembling device, which is configured to dispose the battery module20including the explosion-proof assembly21inside the casing30including the gas discharge passage31, the gas discharge passage31including the gas inlet311and the gas outlet312; anda second assembling device, which is configured to dispose the flow guide member40inside the casing30and to shield the explosion-proof assembly21to form the gas guide passage50, the gas guide passage50being in communication with the gas inlet311, for guiding the gas generated by the battery module20to an exterior of the casing30through the gas outlet312after the explosion-proof assembly21is destroyed.

In some embodiments, the casing30includes the cover32and the housing33. The cover32is connected to the housing33. The gas discharge passage31is disposed on the housing33. By using the first assembling device, the battery module20is disposed inside the housing33, and then the cover32is covered onto the housing33. By using the second assembling device, the flow guide member40is connected and fixed to the cover32in advance, and then the cover32is covered onto the housing33. The flow guide member40shields the explosion-proof assembly21, and the gas guide passage50is enclosed and formed by the flow guide member40and the battery module20.

Although the present disclosure has been described with reference to the preferred embodiments, various modifications may be made thereto and components thereof may be replaced with equivalents without departing from the scope of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the embodiments can be combined in any manner. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.