Battery device and electric device

Abstract

Embodiments of the present disclosure relate to the technical field of batteries, and provide a battery device and an electric device. An exhaust channel of a case body of a mounting case is configured to be communicated with the exterior of the case body. A channel wall of the exhaust channel is provided with receiving ports. A battery cell assembly is located in an accommodating cavity. An electrode assembly of each battery cell of the battery cell assembly is located in a casing of the battery cell. Each casing is provided with a pressure relief port. A sealing ring which is separately in sealing contact with the channel wall of the exhaust channel and the corresponding casing is arranged between the battery cell and the channel wall of the exhaust channel. Each sealing ring surrounds the corresponding pressure relief port and the corresponding receiving port and defines a guide cavity. A pressure relief device is mounted on the side of the channel wall facing away from the corresponding sealing ring to block the receiving port. Each receiving port is correspondingly provided with the pressure relief device. The receiving port communicates the exhaust channel with the corresponding guide cavity when the corresponding pressure relief device is in an open state. A pressure relief device is mounted on the side of the channel wall facing away from a corresponding sealing ring to block a corresponding receiving port, thereby reducing the possibility of thermal runaway propagating to battery cells in an accommodating cavity.

Description

A battery device and an electrical device Technical Field

[0001] This disclosure relates to the field of battery technology, specifically to a battery device and an electrical device. Background Technology

[0002] Batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are increasingly being used in the field of energy storage.

[0003] The battery cell assembly is located inside the housing cavity of the casing. During the process of thermal runaway of a battery cell in the battery cell assembly, thermal runaway may spread to the battery cells inside the housing cavity. Summary of the Invention

[0004] In view of this, embodiments of the present disclosure aim to provide a battery device and an electrical device that reduce the possibility of thermal runaway spreading to individual battery cells within the housing cavity.

[0005] To achieve the above objectives, the technical solution of this disclosure embodiment is implemented as follows:

[0006] This disclosure provides a battery device, including:

[0007] The mounting box includes a box body having a receiving cavity and an exhaust channel, the exhaust channel being used to communicate with the outside of the box body, and the channel wall of the exhaust channel having a receiving port;

[0008] A battery cell assembly is located within the receiving cavity. The battery cell assembly includes at least one battery cell. The battery cell includes a housing and an electrode assembly located within the housing. The housing has a pressure relief port.

[0009] A sealing ring is located inside the receiving cavity. The sealing ring is provided between each battery cell and the channel wall of the exhaust channel. The sealing ring is in sealing contact with the channel wall of the exhaust channel and the corresponding outer shell. The sealing ring surrounds the corresponding pressure relief port and the corresponding receiving port. The sealing ring forms a guide cavity.

[0010] A pressure relief device is installed on the side of the channel wall away from the sealing ring to block the receiving port. Each receiving port is provided with a pressure relief device. When the pressure relief device is open, the receiving port is connected to the exhaust channel and the corresponding guide cavity.

[0011] In this embodiment, a pressure relief device is installed on the side of the channel wall away from the sealing ring to block the receiving port. This reduces the possibility that thermal runaway ejected material in the exhaust channel may flow back into the receiving cavity through the pressure relief device and the exhaust channel and through the receiving port, damaging the battery cells. This suppresses the spread of thermal runaway to the battery cells within the receiving cavity and reduces the likelihood of thermal runaway spreading to the battery cells within the receiving cavity.

[0012] In some embodiments, the channel wall has a groove, and each receiving port is provided with the groove on the side opposite to the corresponding sealing ring. The surface of the pressure relief device facing the receiving port is a preset surface, and the preset surface is at least partially located in the groove. When the pressure relief device opens the receiving port, the groove is in communication with the receiving port and the exhaust channel, respectively.

[0013] In this embodiment of the disclosure, since the preset surface is at least partially located within the groove, and the area around the preset surface is at least partially shielded by the sidewall of the groove, it is beneficial to reduce the impact of thermal runaway ejected material from the side of the groove on the area around the preset surface. This allows at least a partial seal to be maintained between the preset surface of the pressure relief device and the channel wall of the exhaust channel, reducing the possibility of thermal runaway ejected material in the exhaust channel flowing back into the receiving cavity through the gap between the pressure relief device and the channel wall of the exhaust channel and damaging the battery cells. This reduces the possibility of thermal runaway spreading into the battery cells in the receiving cavity.

[0014] In some embodiments, along the axial direction of the receiving port, the projection area of ​​the receiving port is located within the projection area of ​​the groove, and the preset surface is located within the groove.

[0015] In this embodiment, since the projection area of ​​the receiving port is located within the projection area of ​​the groove, the groove has sufficient space to accommodate the preset surface of the pressure relief device that blocks the receiving port. The entire preset surface is located within the groove, and the entire preset surface is shielded by the sidewall of the groove, reducing the impact of thermal runaway ejected material from the side of the groove on the surrounding area of ​​the preset surface. This allows the entire preset surface of the pressure relief device and the channel wall of the exhaust channel to maintain a good seal, reducing the possibility of thermal runaway ejected material in the exhaust channel flowing back into the receiving cavity through the gap between the pressure relief device and the channel wall of the exhaust channel and damaging the battery cells, thereby reducing the possibility of thermal runaway spreading into the battery cells in the receiving cavity.

[0016] In some embodiments, the surface of the channel wall corresponding to the extreme position on the side of the groove away from the sealing ring is the target surface, and the pressure relief device is located on the side of the target surface facing the sealing ring.

[0017] In this embodiment, since the pressure relief device is located on the side of the target surface facing the corresponding sealing ring, the sidewall of the groove completely blocks the side of the pressure relief device, reducing the impact of thermal runaway ejections in the exhaust channel on the side of the pressure relief device. This helps to maintain a good seal between the preset surface of the pressure relief device and the channel wall, reducing the possibility of thermal runaway ejections in the exhaust channel flowing back into the receiving cavity through the gap between the pressure relief device and the channel wall of the exhaust channel and damaging the battery cells, thereby reducing the possibility of thermal runaway spreading to the battery cells in the receiving cavity.

[0018] In some embodiments, the pressure relief device is in the shape of a sheet.

[0019] In this embodiment of the disclosure, the plate-shaped pressure relief device can fit well with the channel wall, so that the plate-shaped pressure relief device and the channel wall can be better sealed.

[0020] In some embodiments, the ignition point of the pressure relief device is greater than or equal to 800°C.

[0021] In this embodiment of the disclosure, the ignition point of the pressure relief device is greater than or equal to 800°C, which helps to reduce the possibility of the pressure relief device being damaged under the influence of the high temperature of the thermally runaway ejected material.

[0022] In some embodiments, the pressure relief device is made of mica.

[0023] In this embodiment, mica has a high ignition point and good flame-retardant properties, which helps to reduce the possibility of the pressure relief device being damaged under the influence of the high temperature of the thermally runaway ejected material.

[0024] In some embodiments, the battery cell further includes a first pressure relief mechanism, which is installed at the pressure relief port of the housing to open or close the pressure relief port.

[0025] In this embodiment of the disclosure, closing the pressure relief port by the first pressure relief mechanism can, to a certain extent, suppress the entry of external debris into the casing of the battery cell and reduce the possibility of the internal structure of the battery cell detaching from the casing through the pressure relief port. Opening the pressure relief port of the casing by the first pressure relief mechanism can effectively relieve pressure on the casing.

[0026] In some embodiments, the battery device further includes a second pressure relief mechanism, which is installed in the housing and is used to open or close the vent passage.

[0027] In this embodiment, on the one hand, closing the exhaust channel through the second pressure relief mechanism can effectively seal the space inside the casing, which is beneficial for protecting the individual battery cells inside the casing. On the other hand, the thermal runaway ejected material in the exhaust channel can force open the second pressure relief mechanism, causing the second pressure relief mechanism to open the exhaust channel and achieve pressure relief of the battery device's exhaust channel.

[0028] In some embodiments, the housing includes:

[0029] main box;

[0030] A partition is installed on the main housing, and the partition and the main housing enclose the receiving cavity and the exhaust channel. The receiving port is formed on the partition. The sealing rings are in sealing contact with the partition and the corresponding outer shell, respectively. The pressure relief device is installed on the side of the partition away from the sealing ring.

[0031] In this embodiment, the partition and the main housing are manufactured independently. The partition is then installed on the main housing after it is manufactured. Before the partition is installed on the main housing, the pressure relief device can be installed on the side of the partition away from the sealing ring. Then the partition with the pressure relief device installed is installed on the main housing. The installation between the pressure relief device and the partition is not limited by the space of the exhaust channel, which makes the installation between the pressure relief device and the partition more convenient.

[0032] In some embodiments, the side wall of the main housing includes a mounting wall having a limiting rib located on the side of the mounting wall facing the battery cell assembly, and a partition located on the side of the limiting rib away from the battery cell assembly. The partition contacts and limits the movement of the partition toward the battery cell assembly, and the partition and the mounting wall together form the exhaust channel.

[0033] In this embodiment, the separator is inserted into the space on the side of the mounting wall away from the battery cell assembly, so that the separator and the mounting wall form an exhaust channel. The position of the separator is constrained by the limiting rib, thereby realizing the installation between the separator and the main box.

[0034] In some embodiments, the number of mounting walls is at least one, and the number of limiting ribs corresponding to each mounting wall is one. The limiting ribs extend from one end of the mounting wall to the other end along the length direction of the mounting wall, and the arrangement direction of the separator and the battery cell assembly intersects with the length direction of the mounting wall.

[0035] In this embodiment of the present disclosure, the limiting rib extends from one end of the mounting wall to the other end along the length direction of the mounting wall, and most of the spacer along the length direction of the mounting wall can contact and limit the spacer, so that the limiting rib can better limit the spacer and make the spacer more firmly installed on the mounting wall.

[0036] In some embodiments, the spacer is provided with limiting ribs on both opposite sides along the width direction of the mounting wall.

[0037] In this embodiment, the partition member is provided with limiting ribs on both opposite sides along the width direction of the mounting wall. The limiting ribs effectively limit the partition member on both opposite sides along the width direction of the mounting wall, facilitating a more secure installation of the partition member onto the mounting wall.

[0038] In some embodiments, the battery device further includes a rib connected to the bottom of the separator, the rib protruding from the bottom of the separator, the rib being located on the side of the limiting rib opposite to the battery cell assembly, and the rib abutting against the bottom of the main box.

[0039] In this embodiment, the protruding ribs at the bottom of the partition contact the main box, reducing the contact area between the ribs and the partition as a whole and the main box, and reducing the friction between the ribs and the partition as a whole and the main box. This makes it easier to insert the partition into or remove it from the main box during the disassembly and assembly of the partition.

[0040] In some embodiments, the separator includes:

[0041] The first plate, the receiving port is formed on the first plate, and the pressure relief device is installed on the side of the first plate away from the battery cell assembly;

[0042] The second plate is connected to the first plate and is located on the side of the first plate away from the battery cell assembly. The second plate is provided on both sides of the first plate along the width direction of the first plate. The first plate, the second plate and the main box form the exhaust channel, and the first plate and the main box form the receiving cavity.

[0043] In this embodiment of the disclosure, the partition member forms a certain space through the interconnected first plate and second plate. When the first plate, second plate and main box are arranged to form an exhaust channel, the size of the partition member along the width direction of the first plate can be set according to actual needs, and is less affected by the structure of the main box. The first plate and second plate can flexibly form the required exhaust channel with the main box according to actual needs.

[0044] In some embodiments, the pressure relief ports of all battery cells in the same battery cell assembly have the same pressure relief direction.

[0045] In this embodiment of the present disclosure, since the pressure relief ports of all battery cells in the same battery cell assembly have the same pressure relief direction, the battery cells in the same battery cell assembly can discharge the thermal runaway ejected material to the same exhaust channel during the thermal runaway process, which is beneficial to simplifying the arrangement of the exhaust channel of the housing.

[0046] In some embodiments, the number of battery cell assemblies is two, and the number of battery cells in each battery cell assembly is at least two. The arrangement directions of the two battery cell assemblies and the arrangement directions of at least two battery cells in each battery cell assembly are intersected. The pressure relief direction of the pressure relief port of each battery cell is opposite to that of the corresponding other battery cell assembly.

[0047] In this embodiment, the arrangement directions of the two battery cell assemblies and the arrangement directions of at least two battery cells in each battery cell assembly are interleaved, such that at least two battery cells in each battery cell assembly are arranged in a row. This reduces the possibility of thermal runaway ejections from one battery cell being ejected towards the battery cells in the same battery cell assembly, and reduces the possibility of battery cells in the same battery cell assembly blocking each other's pressure relief ports, thus facilitating better pressure relief. The pressure relief direction of the pressure relief port of each battery cell is opposite to that of the corresponding battery cell assembly, which further reduces the possibility of thermal runaway ejections from one battery cell assembly being ejected towards another battery cell assembly, and simplifies the arrangement of the exhaust channels.

[0048] In some embodiments, the sealing ring may be made of rubber or silicone.

[0049] In this embodiment, using common materials such as rubber or silicone for the sealing ring helps to save costs. Furthermore, since the exhaust channel is connected to the outside during the thermal runaway of the battery cell, the pressure inside the exhaust channel is relatively low, and the thermal runaway ejection mainly fills the exhaust channel. Even if the sealing ring is made of common materials such as rubber or silicone, it will not be damaged by the thermal runaway ejection, thus meeting the basic sealing requirements of the sealing ring.

[0050] In some embodiments, the pressure relief device is bonded to the channel wall.

[0051] In this embodiment of the disclosure, by bonding the pressure relief device to the channel wall, the pressure relief device can be installed on the channel wall in a relatively simple and secure manner.

[0052] In some embodiments, the receiving cavity has an opening on one side, and the mounting box further includes a box cover that covers the opening of the receiving cavity. The box cover is installed on the box body, and the arrangement direction of the box cover and the box body is intersected with the pressure relief direction of the pressure relief port.

[0053] In this embodiment, before the cover is installed onto the housing, the opening of the housing's accommodating cavity is open, facilitating the installation of battery cells and other structures into the accommodating cavity. After the battery cells and other structures are installed into the accommodating cavity, the cover is installed onto the housing to close the opening of the accommodating cavity, thus better protecting the battery cells installed inside the housing. The arrangement direction of the cover and the housing is intersecting with the pressure relief direction of the pressure relief port, allowing the battery cells to be laterally depressurized so that thermally runaway ejected material can flow more effectively into the exhaust channel.

[0054] A second aspect of this application provides an electrical device, comprising:

[0055] Main body of the device;

[0056] The battery device of any of the foregoing embodiments is installed on the device body to supply power to the device body.

[0057] In the battery device provided in this embodiment, when some battery cells in the housing cavity of the battery device experience thermal runaway, the thermal runaway ejected material from the battery cell's outer casing is ejected from the pressure relief port. Due to the sealing and guiding effect of the sealing ring, the thermal runaway ejected material cannot dissipate, and the pressure inside the guiding cavity increases. The guiding cavity formed by the sealing ring guides the thermal runaway ejected material ejected from the pressure relief port to the corresponding receiving port and breaks through the corresponding pressure relief device, so that the thermal runaway ejected material enters the exhaust channel through the corresponding receiving port and is discharged out of the box. During the process of thermal runaway ejection material being discharged from the casing through the exhaust channel, because the pressure relief device is installed on the side of the channel wall away from the sealing ring to block the receiving port, the receiving port corresponding to the battery cell that has not experienced thermal runaway is isolated from the exhaust channel by the pressure relief device. The thermal runaway ejection material in the exhaust channel will hardly accumulate on the side of the receiving port facing the sealing ring. The thermal runaway ejection material in the exhaust channel is blocked by the pressure relief device on the side of the receiving port away from the sealing ring and is discharged to the outside of the casing through the exhaust channel as much as possible. This reduces the possibility of deformation of the sealing ring due to the accumulation of high-temperature thermal runaway ejection material. The sealing ring and the channel wall can seal well, reducing the possibility of thermal runaway ejection material in the exhaust channel flowing back to other battery cells in the receiving cavity through the receiving port and the space between the sealing ring and the channel wall. This reduces the damage of thermal runaway ejection material to battery cells and reduces the possibility of thermal runaway spreading to battery cells in the receiving cavity. Furthermore, the impact of thermal runaway ejections in the exhaust channel onto the pressure relief device forces the device against the side of the exhaust channel wall away from the sealing ring. This creates a tighter seal between the pressure relief device and the exhaust channel, improving the seal and reducing the likelihood of thermal runaway ejections flowing back into the containment cavity through the gap between the pressure relief device and the exhaust channel, damaging individual battery cells. This inhibits the spread of thermal runaway to the battery cells within the containment cavity. The higher structural voltage of the battery cells within the containment cavity further suppresses the spread of thermal runaway, effectively separating the thermal runaway ejections from the higher-voltage battery cells and reducing the possibility of high-voltage arcing from the ejections. Attached Figure Description

[0058] Figure 1 is a schematic diagram of the arrangement of battery cell, sealing ring, pressure relief device, exhaust channel wall and exhaust channel position in related technologies;

[0059] Figure 2 is an exploded view of the battery device according to an embodiment of this disclosure;

[0060] Figure 3 is an exploded view of the end plate, side plate, battery cell assembly and heat insulation pad of an embodiment of this disclosure;

[0061] Figure 4 is an exploded view of the partition and pressure relief device according to an embodiment of this disclosure;

[0062] Figure 5 is a schematic diagram of the structure of the separator according to an embodiment of the present disclosure;

[0063] Figure 6 is a cross-sectional view of position CC in Figure 5;

[0064] Figure 7 is an enlarged view of position D in Figure 6;

[0065] Figure 8 is a structural schematic diagram of the box body according to an embodiment of this disclosure;

[0066] Figure 9 is a schematic diagram of the structure of the battery device according to an embodiment of this disclosure;

[0067] Figure 10 is a cross-sectional view of position EE in Figure 9;

[0068] Figure 11 is an enlarged view of position F in Figure 10;

[0069] Figure 12 is an enlarged view of position H in Figure 11;

[0070] Figure 13 is a cross-sectional view of position GG in Figure 10;

[0071] Figure 14 is an enlarged view of position I in Figure 13;

[0072] Figure 15 is an enlarged view of position J in Figure 14;

[0073] Figure 16 is an enlarged view of position K in Figure 14.

[0074] Explanation of reference numerals in the attached drawings: 1. Mounting box; 11. Box body; 111. Receiving cavity; 112. Exhaust channel; 1121. Receiving port; 1122. Groove; 1123. Target surface; 113. Main box; 1131. Mounting wall; 1132. Limiting rib; 114. Separator; 1141. First plate; 1142. Second plate; 12. Box cover; 2. Battery cell assembly; 21. Battery cell; 211. Outer shell; 213. First pressure relief mechanism; 3. Sealing ring; 31. Guide cavity; 4. Pressure relief device; 41. Preset surface; 5. Second pressure relief mechanism; 6. Raised rib; 7. Heat insulation pad; 8. End plate; 9. Side plate. Detailed Implementation

[0075] The embodiments of the technical solutions disclosed herein will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solutions disclosed herein and are therefore intended to limit the scope of protection of this disclosure.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having” and any variations thereof in embodiments of this disclosure are intended to cover non-exclusive inclusion.

[0077] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0078] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0079] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0080] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0081] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0082] In related technologies, please refer to Figure 1. When a battery cell 21 in the battery cell assembly 2 of the battery device experiences thermal runaway, the thermal runaway ejected material generated by the battery cell 21 can be discharged outside the housing 11 through the exhaust channel 112. A sealing ring 3 is provided between the battery cell 21 and the channel wall of the exhaust channel 112 to guide the thermal runaway ejected material from the battery cell 21 to the corresponding receiving port 1121 on the channel wall, thereby flowing through the corresponding receiving port 1121 to the exhaust channel 112 and being discharged outside the housing 11 through the exhaust channel 112. A pressure relief device 4 is provided at the corresponding position of the receiving port 1121 to block the receiving port 1121, so as to prevent the thermal runaway ejected material in the exhaust channel 112 from flowing back into the receiving cavity 111 from the receiving port 1121 and flowing to the nearby battery cell 21. However, since the pressure relief device 4 blocking the receiving port 1121 is located on the side of the channel wall facing the receiving cavity 111, the pressure relief device 4 is located between the sealing ring 3 and the channel wall of the exhaust channel 112. The pressure relief device 4 is pressed against the side of the channel wall facing the receiving cavity 111 by the sealing ring 3. The thermal runaway ejected material in the exhaust channel 112 may impact the pressure relief device 4 through the receiving port 1121 and accumulate to a certain extent on the side of the channel wall facing the receiving cavity 111 and between the pressure relief device 4. This accumulation location is exactly near the position where the sealing ring 3 presses against the pressure relief device 4 and is roughly located on the side of the receiving port 1121 facing the receiving cavity 111. The thermal runaway ejected material with a high temperature may accumulate at this position and be closer to the sealing ring 3, causing the sealing ring 3 to deform due to heat. After the sealing ring 3 is deformed due to heat, the seal fails. Furthermore, since the pressure relief device 4 blocking the receiving port 1121 is located on the side of the channel wall facing the receiving cavity 111, the side of the pressure relief device 4 facing the channel wall is always impacted by the thermal runaway ejected material in the exhaust channel 112, causing the surface of the pressure relief device 4 facing the channel wall to tend to move away from the channel wall, which is not conducive to maintaining a seal between the pressure relief device 4 and the channel wall.

[0083] Specifically, referring to Figure 1, the gas in the exhaust passage 112 moves roughly in the direction shown by arrow A. Because the pressure relief device 4, which blocks the receiving port 1121, is located on the side of the passage wall facing the receiving cavity 111, the receiving port 1121 is connected to the exhaust passage 112. During the movement of the thermally runaway ejected material in the exhaust passage 112 roughly in the direction shown by arrow A, some of the thermally runaway ejected material flows into the receiving port 1121 and accumulates at the position where the pressure relief device 4 contacts the passage wall. The location where the thermally runaway ejected material accumulates is shown by arrow B in the figure. This position is approximately where the sealing ring 3 compresses the pressure relief device 4. At the position where the pressure relief device 4 is pressed against the channel wall, some thermal runaway ejected material accumulates at the contact point between the pressure relief device 4 and the channel wall, which may cause the sealing ring 3 of the pressure relief device 4 to deform to a certain extent due to heat. The pressure of the sealing ring 3 on the pressure relief device 4 decreases, which may cause the seal between the pressure relief device 4 and the channel wall to be damaged by the impact of the thermal runaway ejected material in the exhaust channel 112. The thermal runaway ejected material in the exhaust channel 112 may return from between the pressure relief device 4 and the channel wall into the receiving cavity 111, causing damage to the battery cell 21 in the receiving cavity 111, and causing thermal runaway to spread to the battery cell 21 in the receiving cavity 111.

[0084] In this embodiment, the pressure relief device is installed on the side of the channel wall away from the sealing ring to block the receiving port, thus isolating the exhaust channel from the receiving port through the pressure relief device. During the process of thermal runaway of some battery cells in the receiving cavity and the thermal runaway ejection material being discharged through the exhaust channel, the thermal runaway ejection material in the exhaust channel is blocked by the pressure relief device and will not flow to the receiving port. The thermal runaway ejection material will hardly accumulate near the receiving port on the side close to the sealing ring. The thermal runaway ejection material is sealed in the exhaust channel by the pressure relief device and will not flow to the receiving port, so it will hardly affect the contact seal between the sealing ring and the channel wall. The thermal runaway ejection material in the exhaust channel will be discharged to the outside of the box as much as possible, reducing the possibility of thermal runaway spreading to the battery cells in the receiving cavity.

[0085] The solutions disclosed in this embodiment can be applied to both battery devices and electrical devices that include battery devices.

[0086] This disclosure provides an electrical device, which includes a device body and a battery device, wherein the battery device is installed on the device body to supply power to the device body.

[0087] In this embodiment of the disclosure, power is supplied to the main body of the device via a battery device.

[0088] Electrical devices are devices that use electrical energy as their energy source to perform corresponding functions by consuming electrical energy. For example, electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0089] The main body of a device refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, an electrical device can be a mobile phone, where the main body is the part that enables communication and other functions, powered by individual battery cells or battery packs. Similarly, an electrical device can be a car, where the main body is the part that provides seating and allows the vehicle to move on the road, powered by individual battery cells or battery packs.

[0090] In one embodiment, the battery device may be a battery pack.

[0091] In one embodiment, the battery device can be an energy storage device.

[0092] The battery device of this disclosure includes a housing and a battery cell assembly, the battery cell assembly including at least one battery cell, the battery cell assembly being located within the housing.

[0093] In this embodiment of the disclosure, electrical energy is stored or released through individual battery cells.

[0094] A single battery cell can be a rechargeable battery. A rechargeable battery is a battery cell that can be recharged after it has been discharged, allowing the active materials to be activated and the cell to continue to be used.

[0095] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this disclosure does not limit it.

[0096] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0097] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0098] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this disclosure is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM)811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0100] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0101] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0102] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0103] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0104] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this disclosure is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0105] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode, the surface of the foamed metal may or may not contain a negative electrode active material.

[0106] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0107] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0108] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0109] In some embodiments, the separator is a separator membrane. This disclosure does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0110] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0111] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0112] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0113] Liquid electrolytes include electrolyte salts and solvents.

[0114] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0115] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0116] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0117] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0118] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0119] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0120] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium-germanium-phosphorus-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0121] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0122] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0123] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0124] In some implementations, the electrode assembly is a stacked structure.

[0125] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0126] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0127] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0128] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0129] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0130] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0131] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0132] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0133] In some embodiments, referring to Figures 2-4, 10, 11, and 13-16, the battery device includes a mounting box 1, a battery cell assembly 2, a sealing ring 3, and a pressure relief device 4. The mounting box 1 includes a housing 11, which has a receiving cavity 111 and an exhaust channel 112 for communicating with the outside of the housing 11. The channel wall of the exhaust channel 112 has a receiving port 1121. The battery cell assembly 2 is located within the receiving cavity 111. The battery cell assembly 2 includes at least one battery cell 21. The battery cell 21 includes a housing 211 and an electrode assembly located within the housing 211. The housing 211 has a pressure relief port. A sealing ring 3 is located within the receiving cavity 111. A sealing ring 3 is disposed between each battery cell 21 and the channel wall of the exhaust channel 112. The sealing ring 3 makes sealing contact with both the channel wall of the exhaust channel 112 and the corresponding outer casing 211. The sealing ring 3 surrounds the corresponding pressure relief port and the corresponding receiving port 1121, forming a guide cavity 31. A pressure relief device 4 is installed on the side of the channel wall opposite to the sealing ring 3 to block the receiving port 1121. Each receiving port 1121 is correspondingly provided with a pressure relief device 4. When the pressure relief device 4 is open, the receiving port 1121 connects the exhaust channel 112 and the corresponding guide cavity 31.

[0134] The housing 11 is the main structure that houses the battery cell assembly 2, and most of the battery device is installed inside the housing 11.

[0135] For example, please refer to Figures 8, 10 to 16, where the exhaust channel 112 is located inside the side wall of the housing 11.

[0136] For example, as shown in Figures 5 and 8, the exhaust channel 112 has one or at least two receiving ports 1121 on its channel wall.

[0137] For example, please refer to Figures 8, 10 and 13. The accommodating cavity 111 is provided with channel walls having receiving ports 1121 on both sides. The number of receiving ports 1121 on each side channel wall is one or at least two.

[0138] For example, please refer to Figures 5, 8, 10 and 11. Each channel wall with a receiving port 1121 on each side corresponds to a battery cell assembly 2. The pressure relief port of the battery cell 21 in each battery cell assembly 2 corresponds one-to-one with the receiving port 1121 of each channel wall.

[0139] The receiving cavity 111 is the space inside the box 11 mainly used to accommodate the battery cell assembly 2.

[0140] The battery cell assembly 2 is a structure mainly composed of battery cells 21, and the battery cell assembly 2 may include one or at least two battery cells 21.

[0141] For example, at least two battery cells 21 in the battery cell assembly 2 are connected in series or in parallel to form the battery cell assembly 2.

[0142] For example, the battery cell assembly 2 can serve as at least a part of the module structure.

[0143] For example, the battery cell assembly 2 may also not participate in the assembly into a module.

[0144] For example, the number of battery cells 21 in each battery cell assembly 2 can be one, two, five, eight or ten.

[0145] The sealing ring 3 is an annular structure with sealing function. The sealing ring 3 contacts the channel wall of the exhaust channel 112 and the outer shell 211 of the corresponding battery cell 21 to achieve sealing. The thermal runaway ejected material is guided to the receiving port 1121 and the exhaust channel 112 through the guide cavity 31 of the sealing ring 3.

[0146] For example, the sealing ring 3 can be made of rubber or silicone.

[0147] The pressure relief device 4 is a structure that discharges gas from the receiving cavity 111 when the gas pressure inside the receiving cavity 111 is high. In the event of thermal runaway of the corresponding battery cell 21 within the receiving cavity 111, the pressure relief device 4 can be opened by the runaway ejected material to relieve pressure on the ejected material from the thermally runaway battery cell 21. The pressure relief port blocks the receiving port 1121, and the pressure relief port can, to a certain extent, prevent the runaway ejected material from the exhaust channel 112 from flowing back into the receiving cavity 111.

[0148] For example, the ignition point of the pressure relief device 4 is greater than or equal to 800°C.

[0149] For example, the ignition point of the pressure relief device 4 can be 800°C, 810°C, 860°C or 900°C, etc.

[0150] For example, the pressure relief device 4 is made of mica.

[0151] For example, the pressure relief device 4 is made of mica paper.

[0152] The pressure relief device 4 is installed on the side of the channel wall opposite to the sealing ring 3 to cover the receiving port 1121. Along the axial direction of the receiving port 1121, the projected area of ​​the receiving port 1121 is located within the projected area of ​​the pressure relief device 4. The pressure relief device 4 almost completely covers the corresponding receiving port 1121. The pressure relief device 4 contacts the side of the channel wall of the exhaust channel 112 opposite to the receiving cavity 111, and is supported by the side of the channel wall of the exhaust channel 112 opposite to the sealing ring 3.

[0153] For example, please refer to Figures 10, 11, 13 and 14, where at least a portion of the structure of the exhaust passage 112 is provided on both opposite sides of the receiving cavity 111.

[0154] For example, please refer to Figures 13 to 16, where the pressure relief device 4 and the sealing ring 3 are arranged in a cross direction with the vertical direction.

[0155] For example, please refer to Figures 2, 8 to 16. The direction indicated by arrow R1 in the figures is the arrangement direction of the pressure relief device 4 and the sealing ring 3, and the direction indicated by arrow R3 in the figures is the up and down direction.

[0156] For example, please refer to Figures 2, 8 to 16. The arrangement direction of the pressure relief device 4 and the sealing ring 3 is perpendicular to the vertical direction.

[0157] In this embodiment of the present disclosure, when some of the battery cells 21 in the housing cavity 111 of the battery device experience thermal runaway, the thermal runaway ejected material from the battery cell 21 is ejected from the pressure relief port of the outer casing 211 of the battery cell 21. Due to the sealing and guiding effect of the sealing ring 3, the thermal runaway ejected material cannot escape, and the pressure in the guiding cavity 31 increases. The thermal runaway ejected material ejected from the pressure relief port is guided by the guiding cavity 31 formed by the sealing ring 3 to the corresponding receiving port 1121 and to open the corresponding pressure relief device 4, so that the thermal runaway ejected material enters the exhaust channel 112 through the corresponding receiving port 1121 and is discharged to the outside of the housing 11. During the process of thermal runaway ejection material being discharged from the housing 11 through the exhaust channel 112, because the pressure relief device 4 is installed on the side of the channel wall away from the sealing ring 3 to block the receiving port 1121, the receiving port 1121 corresponding to the battery cell 21 that has not experienced thermal runaway is isolated from the exhaust channel 112 by the pressure relief device 4. The thermal runaway ejection material in the exhaust channel 112 will hardly accumulate on the side of the receiving port 1121 facing the sealing ring 3. The thermal runaway ejection material in the exhaust channel 112 is blocked by the pressure relief device 4 at the receiving port 1121 away from the sealing ring. The material is discharged to the outside of the housing 11 as much as possible through the exhaust channel 112, which reduces the possibility of deformation of the sealing ring 3 due to the accumulation of thermal runaway ejected material at high temperature. The sealing ring 3 can seal well with the channel wall, which reduces the possibility of thermal runaway ejected material in the exhaust channel 112 flowing back to other battery cells 21 in the receiving cavity 111 through the receiving port 1121 and between the sealing ring 3 and the channel wall. This reduces the damage of thermal runaway ejected material to battery cells 21 and reduces the possibility of thermal runaway spreading to battery cells 21 in the receiving cavity 111. Furthermore, the thermal runaway ejection in the exhaust channel 112 impacts the pressure relief device 4, pressing it against the side of the exhaust channel 112 wall away from the sealing ring 3. This results in a tighter seal between the pressure relief device 4 and the exhaust channel 112, improving the seal and reducing the possibility of the thermal runaway ejection in the exhaust channel 112 flowing back into the receiving cavity 111 through the pressure relief device 4 and the exhaust channel 112 and via the receiving port 1121, damaging the battery cells 21. This suppresses the spread of thermal runaway to the battery cells 21 in the receiving cavity 111, reducing the likelihood of thermal runaway propagating to the battery cells 21 in the receiving cavity 111. The high voltage structure of the battery cells 21 in the receiving cavity 111 further suppresses the spread of thermal runaway to the battery cells 21 in the receiving cavity 111, effectively separating the thermal runaway ejection from the high-voltage battery cells 21 in the receiving cavity 111 as much as possible, reducing the possibility of high-voltage arcing from the thermal runaway ejection.

[0158] In some embodiments, please refer to Figures 4 to 7 and Figures 10 to 16. The channel wall has a groove 1122. Each receiving port 1121 is provided with the groove 1122 on the side opposite to the corresponding sealing ring 3. The surface of the pressure relief device 4 facing the receiving port 1121 is a preset surface 41. The preset surface 41 is at least partially located in the groove 1122. When the pressure relief device 4 opens the receiving port 1121, the groove 1122 communicates with the receiving port 1121 and the exhaust channel 112, respectively.

[0159] The groove 1122 is a recessed space on the channel wall. The groove 1122 is located on the side of the receiving port 1121 away from the corresponding sealing ring 3. The recessed direction is from the receiving port 1121 along the axial direction of the receiving port 1121 toward the sealing ring 3.

[0160] The sidewall of the groove 1122 refers to the groove wall of the groove 1122 that extends circumferentially along the receiving port 1121.

[0161] In this embodiment, since the preset surface 41 is at least partially located within the groove 1122, and the area around the preset surface 41 is at least partially shielded by the sidewall of the groove 1122, it helps to reduce the impact of thermal runaway ejected material from the side of the groove 1122 on the area around the preset surface 41. This allows at least a partial seal to be maintained between the preset surface 41 of the pressure relief device 4 and the channel wall of the exhaust channel 112, reducing the possibility of thermal runaway ejected material in the exhaust channel 112 flowing back into the receiving cavity 111 through the gap between the pressure relief device 4 and the channel wall of the exhaust channel 112 and damaging the battery cell 21. This reduces the possibility of thermal runaway spreading into the battery cell 21 in the receiving cavity 111.

[0162] It is understood that the specific structure of the channel wall is not limited. For example, the channel wall is located on the side of the preset surface 41 facing the sealing ring 3, and the groove 1122 may not be provided on the channel wall, so that the preset surface 41 is not blocked by the side wall of the groove 1122.

[0163] In some embodiments, please refer to Figures 5 to 7, 12, 15 and 16. Along the axial direction of the receiving port 1121, the projection area of ​​the receiving port 1121 is located within the projection area of ​​the groove 1122, and the preset surface 41 is located within the groove 1122.

[0164] The preset surface 41 is located within the groove 1122, meaning that the entire preset surface 41 is located within the groove 1122.

[0165] In this embodiment, since the projection area of ​​the receiving port 1121 is located within the projection area of ​​the groove 1122, the groove 1122 has sufficient space to accommodate the preset surface 41 of the pressure relief device 4 that blocks the receiving port 1121. The entire preset surface 41 is located within the groove 1122, and the entire preset surface 41 is shielded by the sidewall of the groove 1122. This reduces the impact of thermal runaway ejected material from the side of the groove 1122 on the area around the preset surface 41. This allows the entire preset surface 41 of the pressure relief device 4 and the channel wall of the exhaust channel 112 to maintain a good seal, reducing the possibility of thermal runaway ejected material in the exhaust channel 112 flowing back into the receiving cavity 111 through the gap between the pressure relief device 4 and the channel wall of the exhaust channel 112 and damaging the battery cell 21. This reduces the possibility of thermal runaway spreading into the battery cell 21 in the receiving cavity 111.

[0166] It is understood that the arrangement of the groove 1122 is not limited. For example, along the axial direction of the receiving port 1121, the projection area of ​​the receiving port 1121 may be partially located outside the projection area of ​​the groove 1122, and the preset surface 41 may be partially located outside the groove 1122.

[0167] In some embodiments, please refer to Figures 5 to 7, 12, 15 and 16, the surface of the channel wall corresponding to the extreme position of the groove 1122 away from the side corresponding to the sealing ring 3 is the target surface 1123, and the pressure relief device 4 is located on the side of the target surface 1123 facing the side corresponding to the sealing ring 3.

[0168] The surface of the channel wall corresponding to the extreme position of the groove 1122 on the side away from the corresponding sealing ring 3 is the target surface 1123, that is, the groove 1122 is located on the side of the target surface 1123 facing the corresponding sealing ring 3, and the groove opening of the groove 1122 on the side away from the corresponding sealing ring 3 is located on the target surface 1123.

[0169] The pressure relief device 4 is located on the side of the target surface 1123 facing the corresponding sealing ring 3, that is, the entire pressure relief device 4 is located in the groove 1122 and does not protrude outside the groove 1122.

[0170] In this embodiment, since the pressure relief device 4 is located on the side of the target surface 1123 facing the corresponding sealing ring 3, the sidewall of the groove 1122 completely blocks the side of the pressure relief device 4, reducing the impact of thermal runaway ejections in the exhaust channel 112 on the side of the pressure relief device 4. This helps to maintain a good seal between the preset surface 41 of the pressure relief device 4 and the channel wall, reducing the possibility of thermal runaway ejections in the exhaust channel 112 flowing back into the receiving cavity 111 through the gap between the pressure relief device 4 and the channel wall of the exhaust channel 112 and damaging the battery cell 21, thereby reducing the possibility of thermal runaway spreading to the battery cell 21 in the receiving cavity 111.

[0171] It is understood that the arrangement of the pressure relief device 4 is not limited. For example, the side of the pressure relief device 4 opposite to the sealing ring 3 protrudes from the target surface 1123.

[0172] In some embodiments, as shown in Figure 4, the pressure relief device 4 is plate-shaped.

[0173] In this embodiment of the disclosure, the sheet-like pressure relief device 4 can fit well against the channel wall, so that the sheet-like pressure relief device 4 and the channel wall can be better sealed.

[0174] Understandably, the shape of the pressure relief device 4 is not limited, as long as it can block the receiving port 1121.

[0175] In some embodiments, the ignition point of the pressure relief device 4 is greater than or equal to 800°C.

[0176] The ignition point of the pressure relief device 4 can be 800℃, 810℃, 860℃ or 900℃, etc.

[0177] In this embodiment, the ignition point of the pressure relief device 4 is greater than or equal to 800°C, which helps to reduce the possibility of the pressure relief device 4 being damaged under the influence of the higher temperature of the thermally runaway ejected material.

[0178] In some embodiments, the pressure relief device 4 is made of mica.

[0179] For example, the pressure relief device 4 is made of mica paper.

[0180] In this embodiment, mica has a high ignition point and good flame-retardant properties, which helps to reduce the possibility of the pressure relief device 4 being damaged under the influence of the high temperature of the thermally runaway ejected material.

[0181] It is understandable that the specific material of the pressure relief device 4 is not limited, and the pressure relief device 4 can be other materials with certain flame retardant capabilities.

[0182] In some embodiments, please refer to Figures 3, 12, 15 and 16, the battery cell 21 further includes a first pressure relief mechanism 213, which is installed at the pressure relief port of the housing 211 to open or close the pressure relief port.

[0183] For example, the first pressure relief mechanism 213 is provided on the pressure relief port.

[0184] For example, the first pressure relief mechanism 213 is provided with grooves.

[0185] For example, the battery cell 21 also includes a sealed bag fitted over the electrode assembly, and the material of the first pressure relief mechanism 213 may be mica.

[0186] For example, the battery cell 21 also includes a sealed bag covering the electrode assembly, and the first pressure relief mechanism 213 is mica paper. The pressure relief port is closed by blocking the mica paper. In the event of thermal runaway of the battery cell 21, the thermal runaway ejection inside the casing 211 of the battery cell 21 forces open the mica paper, which serves as the first pressure relief mechanism 213, thereby relieving pressure inside the casing 211 of the battery cell 21.

[0187] For example, the sealed bag and electrode assembly can be combined to form a pouch cell.

[0188] For example, the ignition point of the first pressure relief mechanism 213 is greater than or equal to 800°C.

[0189] For example, the ignition point of the first pressure relief mechanism 213 can be 800°C, 810°C, 860°C or 900°C, etc.

[0190] For example, the first pressure relief mechanism 213 can be an explosion-proof valve.

[0191] When the battery cell 21 of the battery device is working normally, the pressure relief mechanism closes the pressure relief port. When the battery cell 21 of the battery device experiences thermal runaway, the thermal runaway ejection inside the casing 211 of the corresponding battery cell 21 opens the first pressure relief mechanism 213 to relieve the pressure inside the casing 211 of the battery cell 21.

[0192] In this embodiment of the present disclosure, by closing the pressure relief port through the first pressure relief mechanism 213, it is possible to suppress the entry of external debris into the casing 211 of the battery cell 21 to a certain extent, and to reduce the possibility of the structure inside the casing 211 of the battery cell 21 detaching from the casing 211 through the pressure relief port. By opening the pressure relief port of the casing 211 through the first pressure relief mechanism 213, the pressure relief of the casing 211 can be effectively achieved.

[0193] It is understood that the specific structure of the battery cell 21 is not limited. For example, the battery cell 21 may not be provided with the first pressure relief mechanism 213, and the pressure relief port of the outer casing 211 of the battery cell 21 may be open.

[0194] In some embodiments, referring to Figures 2, 10 and 11, the battery device further includes a second pressure relief mechanism 5, which is installed on the housing 11 and is used to open or close the exhaust passage 112.

[0195] The second pressure relief mechanism 5 is a structure installed on the housing 11 to relieve pressure on the exhaust channel 112 of the housing 11.

[0196] For example, the second pressure relief mechanism 5 can be an explosion-proof valve.

[0197] For example, when the battery cell 21 of the battery device is operating normally, the explosion-proof valve closes the exhaust passage 112, and the exhaust passage 112 is sealed off from the outside of the housing 11, thereby ensuring that the space inside the installation housing 1 is well sealed. In the event of thermal runaway of the battery cell 21 of the battery device, the thermally runaway ejected material enters the exhaust passage 112 through the pressure relief port, the guide cavity 31 and the receiving port 1121 and forces open the explosion-proof valve, which serves as the second pressure relief mechanism 5, to be discharged outside the housing 11.

[0198] In this embodiment, on the one hand, closing the exhaust channel 112 by the second pressure relief mechanism 5 can effectively seal the space inside the housing 11, which is beneficial for better protecting the battery cells 21 inside the housing 11. On the other hand, the thermal runaway ejected material in the exhaust channel 112 can push open the second pressure relief mechanism 5, causing the second pressure relief mechanism 5 to open the exhaust channel 112, thereby relieving pressure on the exhaust channel 112 of the battery device.

[0199] In some embodiments, referring to Figures 8, 11, 14, 15, and 16, the housing 11 includes a main housing 113 and a partition 114. The partition 114 is installed on the main housing 113, and the partition 114 and the main housing 113 enclose the receiving cavity 111 and the exhaust passage 112. The receiving port 1121 is formed on the partition 114. The sealing ring 3 makes sealing contact with the partition 114 and the corresponding outer shell 211, respectively. The pressure relief device 4 is installed on the side of the partition 114 opposite to the sealing ring 3.

[0200] The main box 113 is the main structure of the box 11 used to house the battery cells 21.

[0201] The partition 114 is a structure that divides the internal space of the main box 113. The partition 114 divides the internal space of the main box 113 into a receiving cavity 111 and an exhaust channel 112.

[0202] The partition 114 and the main box 113 form an exhaust channel 112, and the partition 114 itself constitutes the channel wall of the exhaust channel 112.

[0203] For example, the main box 113 and the partition 114 can both be made of metal.

[0204] For example, the main housing 113 and the partition 114 can both be made of aluminum or aluminum alloy.

[0205] The partition 114 is installed on the main box 113. That is, the partition 114 and the main box 113 are two independently manufactured structures. The partition 114 and the main box 113 are manufactured independently, and then the partition 114 is installed on the main box 113.

[0206] For example, the partition 114 and the main housing 113 can be detachably connected.

[0207] For example, the partition 114 and the main housing 113 may be non-detachably connected.

[0208] For example, the partition 114 and the main housing 113 can be welded together.

[0209] For example, the material of the separator 114 can be metal.

[0210] The partition 114 is on the side opposite to the sealing ring 3, that is, the side of the partition 114 facing the exhaust passage 112.

[0211] For example, as shown in Figures 5 to 7, both the receiving port 1121 and the groove 1122 are formed on the separator 114. After the separator 114 is manufactured, it is installed on the main housing 113, which facilitates the processing of the groove 1122 on the side of the separator 114 facing the exhaust channel 112, so that the processing of the groove 1122 on the separator 114 is not limited by the space of the exhaust channel 112.

[0212] For example, the groove 1122 is located on the side of the channel wall away from the sealing ring 3.

[0213] For example, the groove 1122 is located on the side of the separator 114 opposite to the sealing ring 3.

[0214] For example, the target surface 1123 is located on the side of the separator 114 opposite to the sealing ring 3.

[0215] For example, partitions 114 are provided on opposite sides of the receiving cavity 111. Each partition 114 corresponds to a battery cell assembly 2, and the pressure relief port of the battery cell 21 in each battery cell assembly 2 faces the partition 114 on the corresponding side.

[0216] In this embodiment, the partition 114 and the main housing 113 are manufactured independently. The partition 114 is manufactured and then installed on the main housing 113. Before the partition 114 is installed on the main housing 113, the pressure relief device 4 can be installed on the side of the partition 114 away from the sealing ring 3. Then the partition 114 with the pressure relief device 4 installed is installed on the main housing 113. The installation between the pressure relief device 4 and the partition 114 is not limited by the space of the exhaust channel 112, which makes the installation between the pressure relief device 4 and the partition 114 more convenient.

[0217] It is understood that the specific structure of the housing 11 is not limited. For example, the partition 114 and the main housing 113 do not need to be manufactured separately; the partition 114 and the main housing 113 can be integrally formed.

[0218] In some embodiments, referring to Figures 11-16, the side wall of the main housing 113 includes a mounting wall 1131, the mounting wall 1131 having a limiting rib 1132, the limiting rib 1132 being located on the side of the mounting wall 1131 facing the battery cell assembly 2, and the partition 114 being located on the side of the limiting rib 1132 away from the battery cell assembly 2, the partition 114 contacting and limiting the limiting rib 1132 to restrict the partition 114 from moving toward the battery cell assembly 2, the partition 114 and the mounting wall 1131 forming the exhaust channel 112.

[0219] One or at least two side walls of the main housing 113 are mounting walls 1131, which are structures for mounting the partition 114.

[0220] For example, referring to Figures 11-16, mounting walls 1131 are provided on both sides of the receiving cavity 111. The two mounting walls 1131 are arranged opposite to each other. Each mounting wall 1131 is equipped with a corresponding partition 114, and the two partitions 114 are arranged opposite to each other. Each partition 114 corresponds to a battery cell assembly 2, and the pressure relief port of the battery cell 21 in each battery cell assembly 2 faces the partition 114 on the corresponding side.

[0221] The limiting rib 1132 is a structure used to limit the separation member 114.

[0222] For example, please refer to Figures 8, 10 to 16. One end of the separator 114 along the length of the mounting wall 1131 is inserted into the space of the mounting wall 1131 on the side of the limiting rib 1132 away from the battery cell assembly 2, so as to realize the installation between the separator 114 and the mounting wall 1131.

[0223] For example, please refer to Figures 8, 10 to 16, where the direction indicated by arrow R2 is the length direction of the mounting wall 1131.

[0224] For example, the mounting wall 1131 can be manufactured separately and then installed onto other parts of the main housing 113.

[0225] For example, the limiting rib 1132 is welded to the separator 114.

[0226] In this embodiment, the separator 114 is inserted into the space of the mounting wall 1131 on the side of the limiting rib 1132 away from the battery cell assembly 2 so that the separator 114 and the mounting wall 1131 form an exhaust channel 112. The position of the separator 114 is constrained by the limiting rib 1132, thereby realizing the installation between the separator 114 and the main box 113.

[0227] It is understood that the installation method between the main housing 113 and the partition 114 is not limited, as long as the partition 114 installed on the main housing 113 can form a corresponding exhaust channel 112 and receiving cavity 111 with the main housing 113. For example, the limiting rib 1132 may not be provided, and the partition 114 may be welded to other structures of the mounting wall 1131.

[0228] In some embodiments, please refer to Figures 10 to 16, the number of mounting walls 1131 is at least one, and the number of limiting ribs 1132 corresponding to each mounting wall 1131 is one. The limiting ribs 1132 extend from one end of the mounting wall 1131 to the other end of the mounting wall 1131 along the length direction of the mounting wall 1131. The arrangement direction of the separator 114 and the battery cell assembly 2 is intersected with the length direction of the mounting wall 1131.

[0229] For example, please refer to Figures 10 to 16, where the direction indicated by arrow R1 is the arrangement direction of the separator 114 and the battery cell assembly 2.

[0230] For example, the limiting rib 1132 is elongated.

[0231] For example, the length direction of the separator 114 is aligned with the length direction of the mounting wall 1131.

[0232] For example, the separator 114 is provided with a limiting rib 1132 on at least one side along the width direction of the mounting wall 1131.

[0233] For example, please refer to Figures 2, 8, 9, 13 and 14, where the direction indicated by arrow R3 is the width direction of the mounting wall 1131.

[0234] For example, the width direction of the mounting wall 1131 is arranged along the vertical direction.

[0235] For example, the separator 114 is perpendicular to the arrangement direction of the battery cell assembly 2 and the length direction of the mounting wall 1131.

[0236] In this embodiment of the present disclosure, the limiting rib 1132 extends from one end of the mounting wall 1131 to the other end along the length direction of the mounting wall 1131, and most of the spacer 114 along the length direction of the mounting wall 1131 can contact and limit the spacer rib 1132, so that the limiting rib 1132 can better limit the spacer 114 so that the spacer 114 is more firmly installed on the mounting wall 1131.

[0237] It is understood that the specific structure of the limiting rib 1132 is not limited. For example, the limiting rib 1132 includes at least two sub-limiting ribs 1132, which are arranged at intervals along the length direction of the mounting wall 1131.

[0238] In some embodiments, as shown in Figures 14 to 16, the spacer 114 is provided with limiting ribs 1132 on both opposite sides along the width direction of the mounting wall 1131.

[0239] In this embodiment, the partition 114 is provided with limiting ribs 1132 on both opposite sides of the mounting wall 1131 along the width direction. The partition 114 can be well limited by the corresponding limiting ribs 1132 on both opposite sides of the mounting wall 1131 along the width direction, which is beneficial to make the partition 114 more firmly installed on the mounting wall 1131.

[0240] It is understood that the arrangement of the limiting rib 1132 is not limited. For example, the limiting rib 1132 is located only on one side of the separator 114 along the width direction of the mounting wall 1131.

[0241] In some embodiments, referring to Figures 6, 14 and 16, the battery device further includes a rib 6 connected to the bottom of the separator 114. The rib 6 protrudes from the bottom of the separator 114 and is located on the side of the limiting rib 1132 opposite to the battery cell assembly 2. The rib 6 abuts against the bottom of the main box 113.

[0242] The rib 6 is a structure that protrudes from the bottom of the separator 114.

[0243] For example, the rib 6 is elongated.

[0244] For example, at least one side of the receiving cavity 111 is provided with a partition 114, and the number of protruding ribs 6 corresponding to each partition 114 is one. The protruding ribs 6 extend from one end of the partition 114 to the other end of the partition 114 along the length direction of the mounting wall 1131.

[0245] For example, the length direction of the rib 6 is consistent with the length direction of the mounting wall 1131.

[0246] For example, the rib 6 and the separator 114 can be integrally formed.

[0247] In this embodiment, the protruding rib 6 protruding from the bottom of the partition 114 contacts the main box 113, reducing the contact area between the protruding rib 6 and the partition 114 as a whole and the main box 113, and reducing the friction between the protruding rib 6 and the partition 114 as a whole and the main box 113. During the process of disassembling and assembling the partition, it is easier for the partition 114 to be inserted into or removed from the main box 113.

[0248] It is understood that the specific structure of the battery device is not limited. For example, the rib 6 may not be provided, and the bottom of the separator 114 may contact the bottom of the main box 113.

[0249] In some embodiments, referring to Figures 5 and 6, and Figures 14-16, the separator 114 includes a first plate 1141 and a second plate 1142. The receiving port 1121 is formed on the first plate 1141, and the pressure relief device 4 is installed on the side of the first plate 1141 opposite to the battery cell assembly 2. The second plate 1142 is connected to the first plate 1141 and is located on the side of the first plate 1141 opposite to the battery cell assembly 2. The second plate 1142 is provided on both opposite sides of the first plate 1141 along the width direction of the first plate 1141. The first plate 1141, the second plate 1142, and the main housing 113 surround the exhaust channel 112, and the first plate 1141 and the main housing 113 surround the receiving cavity 111.

[0250] The first plate 1141 has a plate-like structure.

[0251] For example, the first plate 1141 is a flat plate.

[0252] The second plate 1142 has a plate-like structure.

[0253] For example, the second plate 1142 is a flat plate.

[0254] For example, please refer to Figures 14 to 16, where the direction indicated by arrow R3 is the width direction of the first plate 1141.

[0255] For example, please refer to Figures 5 to 7, where both the receiving port 1121 and the groove 1122 are formed on the first plate 1141.

[0256] For example, please refer to Figures 5 to 7, the groove 1122 is located on the side of the first plate 1141 opposite to the sealing ring 3.

[0257] For example, please refer to Figures 5 to 7, 12, 15 and 16, the target surface 1123 is located on the side of the first plate 1141 away from the sealing ring 3.

[0258] The first plate 1141, the second plate 1142 and the main box 113 are arranged to form an exhaust channel 112, and the first plate 1141 and the second plate 1142 are both channel walls of the exhaust channel 112.

[0259] For example, referring to Figures 15 and 16, the first plate 1141, the second plate 1142, and the mounting wall 1131 are arranged to form an exhaust channel 112.

[0260] For example, please refer to Figures 15 and 16, where the limiting rib 1132 contacts and limits the first plate 1141 on the side opposite to the second plate 1142.

[0261] The second plate 1142 is located on the side of the first plate 1141 away from the battery cell assembly 2. The second plate 1142 is provided on both sides of the first plate 1141 along the width direction of the first plate 1141, so that the cross-sectional shape of the separator 114 formed by the interconnected first plate 1141 and the second plate 1142 is approximately U-shaped.

[0262] For example, the first plate 1141 and the second plate 1142 are integrally formed.

[0263] For example, the first plate 1141 and the second plate 1142 are welded together.

[0264] In this embodiment of the disclosure, the partition 114 forms a certain space through the interconnected first plate 1141 and second plate 1142. When the first plate 1141, second plate 1142 and main box 113 are arranged to form an exhaust channel 112, the size of the partition 114 along the width direction of the first plate 1141 can be set according to actual needs, and is less affected by the structure of the main box 113. The first plate 1141 and second plate 1142 can flexibly form the required exhaust channel 112 with the main box 113 according to actual needs.

[0265] It is understood that the specific structure of the separator 114 is not limited. For example, the separator 114 may be a flat plate.

[0266] In some embodiments, referring to FIG3, the pressure relief ports of all battery cells 21 in the same battery cell assembly 2 have the same pressure relief direction.

[0267] For example, please refer to Figures 2, 8, 10 and 11. The pressure relief port is arranged in the direction shown by arrow R1 in the figure.

[0268] In this embodiment of the present disclosure, since the pressure relief ports of all battery cells 21 in the same battery cell assembly 2 have the same pressure relief direction, the battery cells 21 in the same battery cell assembly 2 can discharge the thermal runaway ejected material to the same exhaust channel during the thermal runaway process, which is beneficial to simplifying the arrangement of the exhaust channel of the housing 11.

[0269] It is understood that the pressure relief direction of the pressure relief port is not limited. For example, the pressure relief direction of the pressure relief port of each battery cell 21 in the same battery cell assembly 2 may be different.

[0270] In some embodiments, please refer to Figures 2, 10, 11 and 13. The number of battery cell assemblies 2 is two, and the number of battery cells 21 in each battery cell assembly 2 is at least two. The arrangement directions of the two battery cell assemblies 2 and the arrangement directions of at least two battery cells 21 in each battery cell assembly 2 are intersected. The pressure relief direction of the pressure relief port of each battery cell 21 is opposite to that of the corresponding other battery cell assembly 2.

[0271] For example, the arrangement direction of the two battery cell assemblies 2 and the arrangement direction of at least two battery cells 21 in each battery cell assembly 2 are perpendicular.

[0272] For example, please refer to Figures 2, 10, 11 and 13. The direction indicated by arrow R1 is the direction in which two battery cell assemblies 2 are arranged, and the direction indicated by arrow R2 is the direction in which at least two battery cells 21 in each battery cell assembly 2 are arranged.

[0273] For example, the two battery cell assemblies 2 are arranged in the same direction as the sealing ring 3 and the pressure relief device 4.

[0274] In this embodiment, the arrangement directions of the two battery cell assemblies 2 and the arrangement directions of at least two battery cells 21 in each battery cell assembly 2 are interleaved, such that at least two battery cells 21 in each battery cell assembly 2 are arranged in a row. This reduces the possibility of thermal runaway ejections from battery cells 21 being sprayed towards battery cells 21 in the same battery cell assembly 2, and reduces the possibility of battery cells 21 in the same battery cell assembly 2 mutually blocking each other's pressure relief ports, which is beneficial for better pressure relief. The pressure relief direction of the pressure relief port of each battery cell 21 is opposite to that of the corresponding other battery cell assembly 2, which can reduce the possibility of thermal runaway ejections from one battery cell assembly 21 being sprayed towards another battery cell assembly 2, and is beneficial for simplifying the arrangement of the exhaust channel.

[0275] It is understood that the arrangement of the battery cell assembly 2 is not limited. For example, the number of battery cell assemblies 2 can be one. For example, the number of battery cell assemblies 2 can be greater than two.

[0276] In some embodiments, the sealing ring 3 may be made of rubber or silicone.

[0277] In this embodiment, the use of common materials such as rubber or silicone for the sealing ring 3 helps to save costs. Furthermore, since the exhaust channel 112 is connected to the outside during the thermal runaway of the battery cell 21, the pressure inside the exhaust channel 112 is relatively low. The thermal runaway ejection material mainly fills the exhaust channel 112. Even if the sealing ring 3 is made of common materials such as rubber or silicone, it will not be damaged by the thermal runaway ejection material, thus meeting the basic sealing requirements of the sealing ring 3.

[0278] In some embodiments, the pressure relief device 4 is bonded to the channel wall.

[0279] For example, the pressure relief device 4 is made of mica paper, which is adhered to the channel wall.

[0280] For example, the pressure relief device 4 is bonded to the separator.

[0281] For example, the pressure relief device 4 is bonded to the first plate 1141.

[0282] In this embodiment of the disclosure, by bonding the pressure relief device 4 to the channel wall, the pressure relief device 4 can be installed on the channel wall in a relatively simple and secure manner.

[0283] It is understood that the installation method of the pressure relief device 4 is not limited. For example, the pressure relief device 4 can be pressed against the channel wall by a clamping mechanism connected to the channel wall. For example, the pressure relief device 4 can be installed on the channel wall by a connector.

[0284] In some embodiments, please refer to Figures 2, 8 and 13. The receiving cavity 111 has an opening on one side. The mounting box 1 also includes a box cover 12 covering the opening of the receiving cavity 111. The box cover 12 is mounted on the box body 11. The arrangement direction of the box cover 12 and the box body 11 is arranged intersecting the pressure relief direction of the pressure relief port.

[0285] The lid 12 is installed on the box body 11, meaning that the lid 12 and the box body 11 are independently manufactured structures, and the lid 12 is installed on the box body 11 after it is manufactured.

[0286] The lid 12 is a structure that covers the box body 11 and is mainly used to close the opening of the receiving cavity 111.

[0287] For example, please refer to Figures 2, 9 and 13. The direction indicated by arrow R3 in the figures is the arrangement direction of the lid 12 and the body 11.

[0288] For example, the arrangement direction of the cover 12 and the body 11 is perpendicular to the pressure relief direction of the pressure relief port.

[0289] For example, the lid 12 is detachably connected to the body 11.

[0290] For example, the lid 12 and the body 11 are arranged in the vertical direction.

[0291] In this embodiment, before the cover 12 is installed onto the housing 11, the opening of the receiving cavity 111 of the housing 11 is open, facilitating the installation of structures such as the battery cell assembly 2 into the receiving cavity 111. After the battery cell assembly 2 and other structures are installed into the receiving cavity 111, the cover 12 is installed onto the housing 11 to close the opening of the receiving cavity 111, thereby better protecting the battery cell assembly 2 inside the housing 11. The arrangement direction of the cover 12 and the housing 11 is intersected with the pressure relief direction of the pressure relief port, and the battery cell 21 is laterally depressurized to better direct the thermally runaway ejected material to the exhaust channel 112.

[0292] It is understood that the specific structure of the mounting box 1 is not limited. For example, the mounting box 1 may not have a cover 12, and the receiving cavity 111 of the box body 11 may not have an opening.

[0293] In some embodiments, referring to Figures 1-16, the battery device includes a mounting box 1, a battery cell assembly 2, a sealing ring 3, and a pressure relief device 4. The mounting box 1 includes a housing 11 having a receiving cavity 111 and an exhaust channel 112. The exhaust channel 112 communicates with the outside of the housing 11, and its channel wall has a receiving port 1121. The battery cell assembly 2 is located within the receiving cavity 111, and includes at least one battery cell 21. The battery cell 21 includes a housing 211 and an electrode assembly located within the housing 211. The housing 211 has a pressure relief port. The sealing ring 3 is located within the receiving cavity 111, and is disposed between each battery cell 21 and the channel wall of the exhaust channel 112. The sealing ring 3 makes sealing contact with the channel wall of the exhaust channel 112 and the corresponding housing 211, respectively. The sealing ring 3 surrounds the corresponding pressure relief port and the corresponding receiving port 1121, forming a guide cavity 31. A pressure relief device 4 is installed on the side of the channel wall away from the sealing ring 3 to block the receiving port 1121. Each receiving port 1121 is correspondingly provided with a pressure relief device 4. When the pressure relief device 4 is open, the receiving port 1121 connects the exhaust channel 112 and the corresponding guide cavity 31. There are two battery cell assemblies 2, and each battery cell assembly 2 contains at least two battery cells 21. The arrangement directions of the two battery cell assemblies 2 and the arrangement directions of at least two battery cells 21 in each battery cell assembly 2 are interleaved. The pressure relief direction of the pressure relief port of each battery cell 21 is away from the corresponding other battery cell assembly 2. The battery device also includes a heat insulation pad 7, which is provided between two adjacent battery cells 21 in each battery cell assembly 2. The battery assembly also includes end plates 8 installed within the receiving cavity 111 of the housing 11. Each battery cell assembly 2 has end plates 8 at both ends along the arrangement direction of at least two battery cells 21 in the corresponding battery cell assembly 2. Each battery cell assembly 2 is sandwiched between the end plates 8 at the corresponding ends. A heat insulation pad 7 is provided between the end plates 8 and the battery cells 21 adjacent to the end plates 8. The battery assembly also includes side plates 9, with each battery cell assembly 2 corresponding to a side plate 9. The side plates 9 span across the corresponding end plates 8 at both ends and are welded to the corresponding end plates 8. One side of the receiving cavity 111 has an opening. The housing 1 also includes a cover 12 covering the opening of the receiving cavity 111. The cover 12 is installed on the housing 11, and the arrangement direction of the cover 12 and the housing 11 is intersected with the pressure relief direction of the pressure relief port. The battery assembly also includes a second pressure relief mechanism 5, which is installed on the housing 11 and is used to open or close the exhaust channel 112. The second pressure relief mechanism 5 is an explosion-proof valve. The first pressure relief mechanism 213 can also be an explosion-proof valve.The arrangement direction of the receiving cavity 111 and the receiving port 1121 is intersected with the arrangement direction of the receiving cavity 111 and the second pressure relief mechanism 5. The battery cell assembly 2 may or may not constitute a module.

[0294] For example, referring to Figures 10 and 11, the accommodating cavity 111 and the receiving port 1121 are arranged in the direction shown by arrow R1 in the figures. The accommodating cavity 111 and the second pressure relief mechanism 5 are arranged in the direction shown by arrow R2 in the figures.

[0295] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A battery device, comprising: The mounting box includes a box body having a receiving cavity and an exhaust channel, the exhaust channel being used to communicate with the outside of the box body, and the channel wall of the exhaust channel having a receiving port; A battery cell assembly is located within the receiving cavity. The battery cell assembly includes at least one battery cell. The battery cell includes a housing and an electrode assembly located within the housing. The housing has a pressure relief port. A sealing ring is located inside the receiving cavity. The sealing ring is provided between each battery cell and the channel wall of the exhaust channel. The sealing ring is in sealing contact with the channel wall of the exhaust channel and the corresponding outer shell. The sealing ring surrounds the corresponding pressure relief port and the corresponding receiving port. The sealing ring forms a guide cavity. A pressure relief device is installed on the side of the channel wall away from the sealing ring to block the receiving port. Each receiving port is provided with a pressure relief device. When the pressure relief device is open, the receiving port is connected to the exhaust channel and the corresponding guide cavity.

2. The battery device according to claim 1, wherein, The channel wall has a groove, and each of the receiving ports has the groove on the side opposite to the corresponding sealing ring. The surface of the pressure relief device facing the receiving port is a preset surface, and the preset surface is at least partially located in the groove. When the pressure relief device opens the receiving port, the groove is connected to the receiving port and the exhaust channel respectively.

3. The battery device according to claim 2, wherein, Along the axial direction of the receiving port, the projection area of ​​the receiving port is located within the projection area of ​​the groove, and the preset surface is located within the groove.

4. The battery device according to claim 3, wherein, The surface of the channel wall corresponding to the extreme position on the side of the groove away from the sealing ring is the target surface, and the pressure relief device is located on the side of the target surface facing the sealing ring.

5. The battery device according to any one of claims 1 to 4, wherein, The pressure relief device is plate-shaped.

6. The battery device according to any one of claims 1 to 5, wherein, The ignition point of the pressure relief device is greater than or equal to 800°C.

7. The battery device according to any one of claims 1 to 6, wherein, The pressure relief device is made of mica.

8. The battery device according to any one of claims 1 to 7, wherein, The battery cell also includes a first pressure relief mechanism, which is installed at the pressure relief port of the housing to open or close the pressure relief port.

9. The battery device according to any one of claims 1 to 8, wherein, The battery device also includes a second pressure relief mechanism, which is installed in the housing and is used to open or close the exhaust passage.

10. The battery device according to any one of claims 1 to 9, wherein, The enclosure includes: main box; A partition is installed on the main housing, and the partition and the main housing enclose the receiving cavity and the exhaust channel. The receiving port is formed on the partition. The sealing rings are in sealing contact with the partition and the corresponding outer shell, respectively. The pressure relief device is installed on the side of the partition away from the sealing ring.

11. The battery device according to claim 10, wherein, The side wall of the main box includes a mounting wall with a limiting rib. The limiting rib is located on the side of the mounting wall facing the battery cell assembly, and the partition is located on the side of the limiting rib away from the battery cell assembly. The partition contacts and limits the movement of the partition towards the battery cell assembly. The partition and the mounting wall form the exhaust channel.

12. The battery device according to claim 11, wherein, The number of mounting walls is at least one, and the number of limiting ribs corresponding to each mounting wall is one. The limiting ribs extend from one end of the mounting wall to the other end along the length direction of the mounting wall. The arrangement direction of the separator and the battery cell assembly is intersected with the length direction of the mounting wall.

13. The battery device according to claim 11 or 12, wherein, The separator is provided with limiting ribs on both sides of the mounting wall along the width direction.

14. The battery device according to any one of claims 11 to 13, wherein, The battery device also includes a rib connected to the bottom of the separator, the rib protruding from the bottom of the separator, the rib being located on the side of the limiting rib away from the battery cell assembly, and the rib abutting against the bottom of the main box.

15. The battery device according to any one of claims 10 to 14, wherein, The separator includes: The first plate, the receiving port is formed on the first plate, and the pressure relief device is installed on the side of the first plate away from the battery cell assembly; The second plate is connected to the first plate and is located on the side of the first plate away from the battery cell assembly. The second plate is provided on both sides of the first plate along the width direction of the first plate. The first plate, the second plate and the main box form the exhaust channel, and the first plate and the main box form the receiving cavity.

16. The battery device according to any one of claims 1 to 15, wherein, In the same battery cell assembly, the pressure relief ports of all battery cells have the same pressure relief direction.

17. The battery device according to any one of claims 1 to 16, wherein, The number of battery cell assemblies is two, and the number of battery cells in each battery cell assembly is at least two. The arrangement directions of the two battery cell assemblies and the arrangement directions of at least two battery cells in each battery cell assembly are intersected. The pressure relief direction of the pressure relief port of each battery cell is opposite to that of the corresponding other battery cell assembly.

18. The battery device according to any one of claims 1 to 17, wherein, The sealing ring can be made of rubber or silicone.

19. The battery device according to any one of claims 1 to 18, wherein, The pressure relief device is bonded to the channel wall.

20. The battery device according to any one of claims 1 to 19, wherein, The receiving cavity has an opening on one side, and the mounting box also includes a box cover that covers the opening of the receiving cavity. The box cover is installed on the box body, and the arrangement direction of the box cover and the box body is intersected with the pressure relief direction of the pressure relief port.

21. An electrical appliance, wherein, include: Main body of the device; The battery device according to any one of claims 1 to 20 is mounted on the device body to supply power to the device body.

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