Battery box, battery pack and electric device

Abstract

The present disclosure relates to a battery box, a battery pack and an electrical equipment. The battery box comprises a shell, a first breathing device, a second breathing device and at least one partition arranged in the shell, the at least one partition is used to divide a cavity in the shell into a plurality of battery compartments for accommodating battery modules, the at least one partition is provided with the first breathing device, and correspondingly, adjacent two battery compartments are communicated only through the first breathing device. The second breathing device is arranged on the shell, and at least one of the adjacent two battery compartments is communicated with an external environment of the battery pack through the second breathing device. In this way, the second breathing device equal to or more than the number of battery compartments does not need to be arranged on the shell of the battery box, which is conducive to reducing the number of openings on the shell of the battery pack, improving the strength of the battery pack as a whole, and improving the safety of the electrical equipment using the battery pack.

Description

Technical Field

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

[0002] A battery pack is a device used to provide energy to electrical equipment (such as vehicles) and is a core component of electrical equipment.

[0003] In related technologies, multiple battery modules of a battery pack are usually arranged in different battery compartments of the battery pack, and the internal and external pressures of the battery compartment and the outside of the battery pack are balanced by a corresponding breather valve set on the battery pack shell. However, setting multiple breather valves on the battery pack shell will affect the overall strength of the battery pack. Utility Model Content

[0004] This disclosure provides a battery enclosure, a battery pack, and an electrical device to at least partially overcome the problems existing in the related art.

[0005] To achieve the above objectives, according to a first aspect of the present disclosure, a battery housing is provided, including a housing, a first breathing device, a second breathing device, and at least one partition disposed within the housing; At least one separator is used to divide the cavity inside the housing into multiple battery compartments for accommodating battery modules; At least one partition is provided with a first breathing device, and two adjacent battery compartments are connected only through the first breathing device; The second breathing device is disposed in the housing, and at least one of the two adjacent battery compartments is connected to the external environment of the battery pack through the second breathing device.

[0006] Through the above technical solution, in the battery housing provided in this disclosure, since at least one partition is provided with a first breathing device, and two adjacent battery compartments are connected only through the first breathing device, at least two battery compartments can be interconnected through the first breathing device provided on the partition. Simultaneously, since at least one of the two adjacent battery compartments is connected to the external environment of the battery pack through a second breathing device, that is, the second breathing device can connect at least one battery compartment to the external environment of the battery pack, at least the battery compartment with the first breathing device can also be indirectly connected to the external environment of the battery pack through the battery compartment with the second breathing device.

[0007] In other words, in the battery housing provided in this application, it is not necessary to provide multiple second breathing devices equal to or greater than the number of battery compartments on the battery housing shell. Pressure balance between multiple battery compartments and between multiple battery compartments and the external environment can be achieved by using at least one first breathing device provided in the separator and a second breathing device provided on the shell. This helps to reduce the number of second breathing devices provided on the battery housing shell, thereby reducing the number of openings on the battery housing shell. A shell with fewer openings has higher strength, which helps to improve the overall strength of the battery housing and the battery pack using the battery housing. The battery pack has higher safety and is not easily deformed even in the event of a severe collision. It also helps to improve the safety of electrical equipment using the battery pack.

[0008] In some possible implementations, the first breathing device is also configured to disconnect the connection between two adjacent battery compartments in the event of thermal runaway of the battery pack.

[0009] Because the first breathing device is also designed to disconnect the connection between two adjacent battery compartments when thermal runaway occurs in the battery pack, during normal use of the battery pack, the first breathing device can cooperate with the second breathing device to achieve pressure balance between multiple battery compartments and between multiple battery compartments and the external environment. In addition, if the battery modules in some battery compartments experience thermal runaway, the first breathing device can also disconnect the connection between adjacent battery compartments in a timely manner. The high temperature and high pressure gas in the battery compartment experiencing thermal runaway is not likely to flow into the normal battery compartment, which can effectively prevent the spread of thermal runaway and help prevent the expansion of thermal runaway.

[0010] In some possible implementations, each of the partitions has opposing first and second sidewalls; The first sidewall is provided with a first hole, the second sidewall is provided with a second hole, and the interior of the separator is provided with a channel, and both the first hole and the second hole are connected to the channel; The first breathing device includes a sealing member movably disposed within the partition, so that the first breathing device has a first state and a second state; In the first state, the first hole is connected to the second hole through the channel, so that the corresponding adjacent battery compartments can be connected through the corresponding first breathing device; In the second state, the sealing member is configured to block the first hole or the second hole so that the connection between the corresponding two adjacent battery compartments can be disconnected through the first breathing device.

[0011] Since the sealing element is movably disposed within the partition, and the sealing element is configured to block the first hole on the first sidewall or the second hole on the second sidewall in the second state, when the battery pack is in normal use, for example, when the pressure between two adjacent battery compartments is the same or similar and there is no large pressure difference, the first breathing device can be in the initial state, and the sealing element of the first breathing device can be in the middle position between the first hole and the second hole. The sealing element can block the connecting hole on the second plate disposed within the partition. At this time, the channel within the partition is separated by the second plate, that is, the first hole and the second hole are disconnected from each other. In this way, the two adjacent battery compartments can be disconnected, and the two adjacent battery compartments that are disconnected from each other are independent and do not easily affect each other.

[0012] In some possible implementations, the separator includes a first plate, a second plate, and a third plate arranged at intervals along a first direction; The first plate and the third plate are both connected to the housing at both ends in the second direction. The side wall of the first plate away from the second plate is the first side wall, and the side wall of the third plate away from the second plate is the second side wall. The second direction intersects with the first direction. The first plate, the second plate, the third plate, and the housing together define the channel; The second plate is provided with a connecting hole, which is used to connect the first hole and the second hole. In the first state, there is a gap between the sealing member and the connecting hole, the first hole and the second hole.

[0013] The connecting hole on the second plate enables communication between the first and second holes, effectively preventing the second plate from blocking the channel and affecting the communication between the first and second holes.

[0014] Furthermore, by driving the sealing member to move, the sealing member is positioned between the first hole and the connecting hole, that is, there is a gap between the sealing member and both the first hole and the connecting hole, or the sealing member is positioned between the second hole and the connecting hole, that is, there is a gap between the sealing member and both the second hole and the connecting hole. At this time, the two adjacent battery compartments located on both sides of the separator can be connected, thereby achieving pressure balance between the two adjacent battery compartments.

[0015] Furthermore, by setting a third plate between the first and second plates, the first, second, and third plates can together construct a partition with internal channels. The third plate can also support the partition. The partition can be constructed as a frame structure, allowing the connection or disconnection of two adjacent battery compartments through the channels. The partition constructed as a frame structure can not only separate the battery compartments, but also withstand external forces together with the battery box shell, which is beneficial to further improve the overall strength of the battery box and the battery pack using the battery box.

[0016] In some possible implementations, the first breathing device is configured to switch between a first state and a second state under the influence of the pressure difference between the two battery compartments on either side of the corresponding separator.

[0017] In this way, there is no need to set up additional driving components inside the battery box. The pressure difference between the two battery compartments on both sides of the separator can drive the sealing component to move within the channel, realizing the switching between the first state and the second state. This enables pressure balance between the two adjacent battery compartments and can disconnect the connection between the two adjacent battery compartments when a battery module in one battery compartment experiences thermal runaway, preventing the rapid spread of thermal runaway. This simplifies the structure of the battery box and reduces the weight of the battery pack using this battery box, thereby improving the energy density of the battery pack.

[0018] In some possible implementations, the first breathing device further includes a mounting bracket; The mounting bracket includes a support rod and at least one connecting rod, the at least one connecting rod spanning the first hole and / or the second hole and connected to the separator; The support rod is connected to the connecting rod and extends along a first direction. The sealing member is movably sleeved on the support rod along the first direction to seal the first hole or the second hole.

[0019] A support rod spanning the first hole and / or the second hole and connected to the separator can fix the connecting rod on the separator.

[0020] Furthermore, the support rod extending along the first direction can match the moving direction of the sealing member and the spacing direction of the first and second holes. Thus, when the sealing member moves along the support rod in the first direction, the sealing member can connect or disconnect the two adjacent battery compartments.

[0021] In some possible implementations, the first breathing device further includes at least one seal connected to the plugging member, the seal being used to seal the gap between the plugging member and the first or second hole.

[0022] By providing at least one sealing element on the sealing element, the sealing element can fill the gap between the sealing element and the first or second hole when the first breathing device is in the second state. This helps to improve the sealing effect of the sealing element on the first or second hole. The gas that is thermally runaway is not easy to flow through the gap between the sealing element and the first or second hole. This helps to further improve the isolation effect between the two adjacent battery compartments when thermal runaway occurs in one of the two adjacent battery compartments.

[0023] In some possible implementations, the number of seals is two, with the two seals respectively disposed on both sides of the sealing member in the axial direction.

[0024] The two sealing elements located on both sides of the sealing element along the axial direction can respectively seal the gaps between the sealing element and the first hole and between the sealing element and the second hole. In this way, when either of the two adjacent battery compartments on both sides of the separator experiences thermal runaway, the sealing element and either the first hole or the second hole can have a good sealing effect, which is conducive to further improving the separation effect between the two adjacent battery compartments.

[0025] In some possible implementations, the seal is configured to expand when heated.

[0026] Thus, when one of the two adjacent battery compartments experiences thermal runaway, the seal can rapidly expand under the action of the high-temperature and high-pressure thermal runaway gas, filling the gap between the sealing component and the first or second hole and the channel set inside the separator, further improving the isolation effect between the two adjacent battery compartments.

[0027] In some possible implementations, at least one of the separators is provided with a channel for connecting two corresponding adjacent battery compartments; The first breathing device includes a sealing element and at least one sealing element disposed on the sealing element; The thickness of the sealing element in the first direction is A; The minimum dimension of the channel in the first direction is B; The at least one seal is configured such that, when heated and expanded, its thickness in the first direction is C; A, B, and C satisfy: A + C ≥ B.

[0028] Thus, when thermal runaway occurs in one of the two adjacent battery compartments, the overall thickness of the seal and the plug can be greater than the dimension of the channel in the first direction, and the seal and the plug can be tightly clamped between the first sidewall and the second sidewall, thereby simultaneously sealing the first hole on the first sidewall and the second hole on the second sidewall.

[0029] In some possible implementations, a plurality of the battery compartments are arranged at intervals along a first direction, each of the partitions extends along a second direction, and the first breathing device is located at the center of the partition in the second direction, the second direction intersecting the first direction.

[0030] Multiple battery compartments spaced apart along the first direction can meet the requirement of distributed arrangement of battery modules within the battery pack.

[0031] In addition, the first breathing device located in the middle of the separator in the second direction also helps to improve the pressure balance between two adjacent battery compartments.

[0032] In some possible implementations, the partition has a channel inside, through which both the first breathing device and the second breathing device communicate.

[0033] Since both the first and second breathing devices can be connected to the channel within the separator, the first breathing device and the channel can connect two adjacent battery compartments. The first breathing device, the channel, and the second breathing device can also indirectly connect the battery compartments to the external environment of the battery pack, thereby achieving pressure balance between two adjacent battery compartments and between the battery compartments and the external environment.

[0034] In some possible implementations, the second breathing device is disposed on the housing corresponding to the separator.

[0035] By placing the second breathing device on the housing at the corresponding position of the separator, that is, placing the second breathing device on the housing at a position with higher strength where the separator is located, it is beneficial to reduce the impact of placing the second breathing device on the strength of the housing, thereby further improving the overall strength of the battery pack.

[0036] In addition, by placing the second breathing device on the housing at the corresponding position of the separator, it is also beneficial to shorten the distance between the second breathing device and the channel. On the one hand, the shorter distance between the second breathing device and the channel is conducive to achieving pressure balance between the external environment of multiple battery compartments and the battery pack. On the other hand, when the battery module in the battery compartment experiences thermal runaway, the shorter distance between the second breathing device and the channel can also increase the exhaust speed of thermal runaway gas.

[0037] In some possible implementations, the housing includes a tray, a top cover, and a housing seal; The top cover is connected to the tray and the at least one separator via the housing seal, so that the corresponding adjacent battery compartments are connected only through the first breathing device.

[0038] The housing seal can seal the gaps between the top cover, the partition, and the tray, allowing two adjacent battery compartments to be connected only through the first breathing device, thus meeting the sealing requirements between the two adjacent battery compartments.

[0039] Furthermore, in an embodiment where the first breathing device is configured to disconnect the connection between two adjacent battery compartments in the event of thermal runaway of the battery pack, the runaway gas can also be prevented from flowing to another battery compartment through other locations between the two adjacent battery compartments when thermal runaway of the battery pack occurs. This helps to improve the effect of preventing the spread of thermal runaway and preventing the expansion of thermal runaway.

[0040] According to a second aspect of this disclosure, a battery pack is provided, including a battery housing and a plurality of battery modules as described above; Each of the battery compartments is provided with the battery module. According to a third aspect of this disclosure, an electrical device is provided, including a device body and the battery pack described above; The battery pack is used to supply power to the main body of the device.

[0041] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0042] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0043] Figure 1 This is a three-dimensional structural diagram of a portion of the battery housing provided in an exemplary embodiment of the present disclosure, wherein the top cover and housing seal are not shown.

[0044] Figure 2 This is a top-view cross-sectional schematic diagram of a portion of the structure of a battery housing provided in an exemplary embodiment of this disclosure.

[0045] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0046] Figure 4 This is a cross-sectional schematic diagram of a portion of the structure of a battery housing provided in an exemplary embodiment of this disclosure, wherein the first breathing device is in a first state, and the direction of airflow between two adjacent battery compartments during the pressure equilibrium process is indicated by dashed lines and arrows.

[0047] Figure 5This is a cross-sectional schematic diagram of a portion of the structure of a battery box provided in an exemplary embodiment of the present disclosure, wherein the first breathing device is in a second state and the sealing member blocks the first hole.

[0048] Figure 6 This is a front view schematic diagram of the sealing member and the sealing member of the first breathing device provided in an exemplary embodiment of the present disclosure in an assembled state, wherein the sealing member is in a state of thermal expansion.

[0049] Figure 7 This is a three-dimensional structural diagram of the sealing and plugging components of a first breathing device provided in an exemplary embodiment of the present disclosure, in an assembled state.

[0050] Figure 8 This is a three-dimensional structural diagram of a portion of the battery housing provided in an exemplary embodiment of the present disclosure, wherein the sealing component of the first breathing device is not shown.

[0051] Figure 9 This is a top view schematic diagram of a portion of the structure of a battery pack provided in an exemplary embodiment of this disclosure.

[0052] Figure 10 This is an exploded perspective view of a battery pack provided in an exemplary embodiment of the present disclosure, wherein the battery housing is shown, but the battery module is not shown.

[0053] Explanation of reference numerals in the attached figures 100-Battery pack; 10-Battery housing; 11-Housing shell; 111-Tray; 112-Top cover; 113-Housing seal; 12-Separator; 121-First side wall; 122-Second side wall; 123-First hole; 124-Second hole; 125-Channel; 126-First plate; 127-Second plate; 128-Third plate; 13-Battery compartment; 20-First breathing device; 21-Sealing component; 211-Through hole; 212-Sealing disc; 22-Mounting bracket; 221-Support rod; 222-Connecting rod; 23-Seal; 30-Second breathing device; 40-Battery module. Detailed Implementation

[0054] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0055] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Definitions of other terms will be given in the following description.

[0056] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0057] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0058] In this disclosure, it should be understood that directional terms such as "first direction" and "second direction" are defined according to the orientation of the accompanying drawings and are used only for the convenience of describing this disclosure and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational construction and operation, and therefore should not be construed as a limitation of this disclosure. For example, the first direction can be the length direction of the battery pack, such as the length direction of the vehicle; the second direction can be the width direction of the battery pack, such as the width direction of the vehicle. See reference [link to relevant documentation] for details. Figure 1 , Figure 2 , Figure 5 as well as Figure 10 As shown.

[0059] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connect," "link," and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0060] As mentioned above, in related technologies, since multiple battery modules of a battery pack are usually set in multiple battery compartments of the battery pack, in order to achieve pressure balance between multiple battery compartments and the external environment, a breather valve for ventilation is usually set on the shell of the battery pack corresponding to each battery compartment. Since there are many breather valves, multiple through holes need to be opened on the shell of the battery pack. However, multiple through holes will affect the overall strength of the battery pack, resulting in low overall strength. Therefore, there is an urgent need to provide a battery pack that can achieve pressure balance of multiple battery compartments and also has high strength.

[0061] In view of this, such as Figures 1 to 10 As shown, according to a first aspect of the present disclosure, a battery housing 10 is provided, including a housing 11, a first breathing device 20, a second breathing device 30, and at least one partition 12 disposed within the housing 11, wherein the at least one partition 12 is used to divide the cavity within the housing 11 into a plurality of battery compartments 13 for accommodating battery modules 40.

[0062] At least one partition 12 is provided with a first breathing device 20, and the two corresponding connected battery compartments 13 are connected only through the first breathing device 20. A second breathing device 30 is provided on the housing 11, and at least one of the two adjacent battery compartments 13 is connected to the external environment of the battery pack 100 through the second breathing device 30.

[0063] The aforementioned separator 12 refers to a structure disposed within the housing 11 of the battery box 10, capable of dividing the cavity within the housing 11 into multiple battery compartments 13. For example, the separator 12 may be a partition beam disposed within the tray 111 of the battery box 10.

[0064] This disclosure does not limit the number of partitions 12 disposed within the housing 11; the partitions 12 can have any suitable number, for example, such as Figure 1 , Figure 9 and Figure 10 As shown, the number of the partition 12 can be one. One partition 12 disposed in the housing 11 can divide the cavity in the housing 11 into two battery compartments 13. Alternatively, the number of the partition 12 can be multiple. Multiple partitions 12 can divide the cavity in the housing 11 into multiple battery compartments 13. This disclosure does not limit the number of partitions.

[0065] In the battery housing 10 provided in this disclosure, since at least one partition 12 is used to divide the cavity inside the housing 11 into a plurality of battery compartments 13 for accommodating the battery module 40, the partition 12 and the housing 11 cooperate with each other to enable the battery housing 10 to be constructed as a frame structure, the battery housing 10 has high strength, and it is beneficial to improve the strength of the battery pack 100.

[0066] Furthermore, since the battery housing 10 is provided with multiple battery compartments 13, when the battery housing 10 is applied to the battery pack 100, the multiple battery modules 40 of the battery pack 100 can be respectively placed in different battery compartments 13. The multiple battery modules 40 placed in different battery compartments 13 are less likely to interfere with each other. When the battery module 40 in at least one battery compartment 13 experiences thermal runaway, the separator 12 and the housing 11 can play a certain role in blocking the heat transfer. To a certain extent, it can prevent the heat and flame from being rapidly transferred to other battery compartments 13 and affecting the battery modules 40 in other battery compartments 13, thus avoiding a chain reaction and improving the safety of the battery pack 100.

[0067] Here, it should be noted that "the two adjacent battery compartments 13 are only connected through the first breathing device 20" means that when the first breathing device 20 is installed on the separator 12, the first breathing device 20 can connect the two battery compartments 13 separated by the separator 12, while other parts of the two battery compartments 13 separated by the separator 12 are sealed to each other, for example, as... Figure 1 , Figure 2 , Figure 9 as well as Figure 10 As shown, in an embodiment where the battery housing 10 includes two battery compartments 13, which are located on the left and right sides of the partition 12 respectively, the first breathing device 20 can connect the two battery compartments 13 located on the left and right sides of the partition 12. In an embodiment where the battery housing 10 has multiple partitions 12 and the number of battery compartments 13 is greater than or equal to three, the first breathing device 20 can be installed on any partition 12 between any two adjacent battery compartments 13, thereby achieving pressure balance between the multiple battery compartments 13 and between the multiple battery compartments 13 and the external environment.

[0068] Through the above technical solution, in the battery housing 10 provided in this disclosure, since at least one partition 12 is provided with a first breathing device 20, and two adjacent battery compartments 13 are connected only through the first breathing device 20, multiple battery compartments 13 (at least two battery compartments 13) can be interconnected through the first breathing device 20 provided on the partition 12. At the same time, since at least one of the two adjacent battery compartments 13 is connected to the external environment of the battery pack 100 through a second breathing device 30, that is, the second breathing device 30 can connect at least one battery compartment 13 to the external environment of the battery pack 100, at least the battery compartment 13 provided with the first breathing device 20 can also be indirectly connected to the external environment of the battery pack 100 through the battery compartment 13 provided with the second breathing device 30.

[0069] In other words, in the battery housing 10 provided in this application, it is not necessary to provide a number of second breathing devices 30 equal to or greater than the number of battery compartments 13 on the shell 11 of the battery housing 10. Pressure balance between the multiple battery compartments 13 and between the multiple battery compartments 13 and the external environment can be achieved by providing at least one first breathing device 20 in the separator 12 and the second breathing devices 30 on the shell. This is beneficial to reducing the number of second breathing devices 30 provided on the shell 11 of the battery housing 10, thereby reducing the number of openings on the shell 11 of the battery housing 10. The shell 11 with fewer openings has higher strength, which is beneficial to improving the overall strength of the battery housing 10 and the battery pack 100 using the battery housing 10. The battery pack 100 has higher safety and is not easily deformed even in the event of a severe collision. It is also beneficial to improve the safety of electrical equipment (such as vehicles) using the battery pack 100.

[0070] It should be noted that this disclosure does not limit the specific type of the second breathing device 30. The second breathing device 30 can be any breathing device that is suitable for being installed on the housing 11 of the battery box 10 and can achieve pressure balance between the external environment and the battery compartment 13. For example, the second breathing device 30 can be either a piston-type breathing valve or a needle-type breathing valve.

[0071] To further improve the safety of the battery pack 100, in some possible implementations, the first breathing device 20 is also configured to disconnect the connection between two adjacent battery compartments 13 in the event of thermal runaway of the battery pack 100.

[0072] Since the first breathing device 20 is also configured to disconnect the connection between two adjacent battery compartments 13 when thermal runaway occurs in the battery pack 100, during normal use of the battery pack 100, the first breathing device 20 can cooperate with the second breathing device 30 to achieve pressure balance between multiple battery compartments 13 and between multiple battery compartments 13 and the external environment. In addition, if the battery modules 40 in some battery compartments 13 experience thermal runaway, the first breathing device 20 can also disconnect the connection between adjacent battery compartments 13 in a timely manner. The high temperature and high pressure gas in the battery compartment 13 that has experienced thermal runaway is not likely to flow into the normal battery compartment 13, which can effectively prevent the spread of thermal runaway and help prevent the expansion of thermal runaway.

[0073] In other words, in the battery housing 10 provided in this disclosure, the first breathing device 20 can not only achieve pressure balance between two adjacent battery compartments 13, but also prevent the spread of thermal runaway to a certain extent.

[0074] It should be noted that the gas ejected from the battery module 40 can be a mixture of any one or more of gaseous substances, solid substances, and liquid substances.

[0075] In order to enable the first breathing device 20 to achieve pressure balance between the two adjacent battery compartments 13 and to prevent the spread of thermal runaway, as one embodiment of this disclosure, such as Figures 3 to 5 as well as Figure 8 As shown, each partition 12 has a first sidewall 121 and a second sidewall 122. The first sidewall 121 is provided with a first hole 123, and the second sidewall 122 is provided with a second hole 124. A channel 125 is provided inside the partition 12. The first hole 123 and the second hole 124 are both connected to the channel 125. The first breathing device 20 includes a sealing member 21 movably disposed in the partition 12, so that the first breathing device 20 has a first state and a second state. That is, the first breathing device 20 can have a connected state and a blocked state. In the first state, the first hole 123 is connected to the second hole 124 through the channel 125, so that the corresponding two adjacent battery compartments 13 can be connected through the corresponding first breathing device 20. In the second state, the sealing member 21 is configured to block the first hole 123 or the second hole 124, so that the connection between the corresponding two adjacent battery compartments 13 can be disconnected through the first breathing device 20.

[0076] Since the sealing member 21 is movably disposed within the partition member 12, and the sealing member 21 is configured to block the first hole 123 on the first sidewall 121 or the second hole 124 on the second sidewall 122 in the second state, the first breathing device 20 can be in its initial state when the battery pack 100 is in normal use, for example, when the pressure between two adjacent battery compartments 13 is the same or similar and there is no large pressure difference. Figure 3 As shown, the sealing member 21 of the first breathing device 20 can be positioned in the middle between the first hole 123 and the second hole 124. The sealing member 21 can block the connecting hole 211 on the second plate 127 inside the separator 12. At this time, the channel 125 inside the separator 12 is separated by the second plate 127, that is, the first hole 123 and the second hole 124 are disconnected from each other. In this way, the two adjacent battery compartments 13 can be disconnected. The two adjacent battery compartments 13 that are disconnected from each other are independent and do not easily affect each other.

[0077] As the battery pack is used, a pressure difference may develop between two adjacent battery compartments 13. This, coupled with temperature changes (increases or decreases) caused by the charging and discharging of the battery modules, can lead to a pressure difference between the two adjacent battery compartments 13. Alternatively, if the internal and external pressures of the battery pack become unbalanced due to altitude or other factors, the sealing component 21 may move under the influence of this pressure difference, for example, moving to a position where... Figure 4 At the position shown, the first breathing device 20 is in the first state, that is, the first breathing device 20 is in the connected state. The sealing member 21 can be located inside the channel 125 and has gaps between it and the first hole 123 on the first sidewall 121 and the second hole 124 on the second sidewall 122. That is, in the first direction, the thickness of the sealing member 21 is less than the distance between the first hole 123 and the second hole 124. At this time, as Figure 4 As shown, the first hole 123, the second hole 124, and the channel 125 are in a connected state. Gas can flow between two adjacent battery compartments 13 through the first hole 123, the second hole 124, and the channel 125, thereby achieving pressure balance among multiple battery compartments 13. Furthermore, through the second breathing device 30, communication between the battery compartments 13 and the external environment can also be achieved, thereby achieving pressure balance between multiple battery compartments 13 and the external environment.

[0078] Furthermore, when thermal runaway occurs in some of the battery modules 40 within the battery compartment 13, the sealing member 21 can also move within the separator 12 (e.g., within the channel 125 of the separator 12) under the influence of pressure difference, sealing the first hole 123 or the second hole 124. At this time, the first breathing device 20 is in the second state, that is, the first breathing device 20 is in the sealed state, such as... Figure 5 As shown, gas cannot flow between two adjacent battery compartments 13 through the first hole 123, the second hole 124, and the channel 125. Thus, even if the battery module 40 in some battery compartments 13 experiences thermal runaway, the runaway gas will not flow to other normal battery compartments 13 through the first breathing device 20, thereby effectively preventing the spread of thermal runaway.

[0079] As another embodiment of this disclosure, valves may also be provided on the first hole 123 and the second hole 124, for example, a first electrically controlled switch valve and a second electrically controlled switch valve. These two valves, for example, the first electrically controlled switch valve or the second electrically controlled switch valve, are configured to selectively open or close the first hole 123 and the second hole 124. In this way, it is also possible to achieve connection or disconnection between two adjacent battery compartments 13.

[0080] Alternatively, a connecting membrane can be provided on the first hole 123 and the second hole 124, which can form a dense isolation layer when heated.

[0081] Thus, the connecting membrane disposed on the first hole 123 and the second hole 124 can also connect the two adjacent battery compartments 13 during normal use of the battery pack 100, and can achieve isolation between the two adjacent battery compartments 13 through a dense insulating layer when one of the battery compartments 13 experiences thermal runaway. In the battery housing 10 provided in this disclosure, the separator 12 can have any suitable specific structure, and this disclosure does not limit it. In some possible embodiments, such as Figures 3 to 5 as well as Figure 8 As shown, the separator 12 includes a first plate 126, a second plate 127, and a third plate 128 arranged at intervals along a first direction. The first plate 126 and the third plate 128 are both connected to the housing 11 at their two ends in a second direction. The side wall of the first plate 126 facing away from the second plate 127 is a first side wall 121, and the side wall of the third plate 128 facing away from the second plate 127 is a second side wall 122. The second direction intersects with the first direction. The first plate 126, the second plate 127, the third plate 128, and the housing 11 together define a channel 125. The second plate 127 is provided with a connecting hole 211, which is used to connect the first hole 123 and the second hole 124. In the first state, there is a gap between the sealing member 21 and the connecting hole 211, the first hole 123, and the second hole 124. That is, in the first state, in the first direction, the thickness of the sealing member 21 is less than the distance between the first hole 123 and the connecting hole 211 or the second hole 124 and the connecting hole 211.

[0082] Here, it can be understood that the two ends of the second plate 127 in the second direction are also connected to the housing 11.

[0083] The first plate 126, the second plate 127, and the third plate 128 cooperate with the housing 11 to form a separator 12, and define a channel 125 inside the separator 12 to connect two adjacent battery compartments 13.

[0084] Here, it can be understood that the third plate 128 can divide the channel 125 located between the first plate 126 and the second plate 127 of the separator 12 into two parts, namely, the part located between the first plate 126 and the third plate 128 and the part located between the third plate 128 and the second plate 127, and the two parts of the channel 125 are connected by a connecting hole 211 provided on the second plate 127.

[0085] The connecting hole 211 provided on the second plate 127 enables communication between the first hole 123 and the second hole 124, effectively preventing the second plate 127 from blocking the channel 125 and affecting the communication between the first hole 123 and the second hole 124 due to the second plate 127 being provided in the separator 12.

[0086] And, as Figure 5 As shown, by driving the sealing member 21 to move, the sealing member 21 is positioned between the first hole 123 and the connecting hole 211, that is, there is a gap between the sealing member 21 and both the first hole 123 and the connecting hole 211. Alternatively, the sealing member 21 is positioned between the second hole 124 and the connecting hole 211, that is, there is a gap between the sealing member 21 and both the second hole 124 and the connecting hole 211. At this time, the two adjacent battery compartments 13 located on both sides of the separator 12 can be connected, thereby achieving pressure balance between the two adjacent battery compartments 13.

[0087] Furthermore, by setting a third plate 128 between the first plate 126 and the second plate 127, the first plate 126, the second plate 127 and the third plate 128 can jointly construct a partition 12 with an internal channel 125. The third plate 128 can also support the partition 12. The partition 12 can be constructed as a frame structure, under the premise that the two adjacent battery compartments 13 can be connected or disconnected through the channel 125. The partition 12, constructed as a frame structure, can not only separate the battery compartments 13, but also bear external forces together with the shell 11 of the battery box 10, which is conducive to further improving the overall strength of the battery box 10 and the battery pack 100 using the battery box 10.

[0088] It is understood that, for the embodiment in which the separator 12 includes a first plate 126, a second plate 127, and a third plate 128 spaced apart along a first direction, when the first breathing device 20 is in the first state, the sealing member 21 can be located between the first plate 126 and the third plate 128, or between the third plate 128 and the second plate 127. At this time, there is a gap between the sealing member 21 and both the first plate 126 and the third plate 128, or a gap between the sealing member 21 and both the third plate 128 and the second plate 127. Airflow can flow through the gap between the first plate 126 and the third plate 128 or between the third plate 128 and the second plate 127, thereby achieving pressure balance between the multiple battery compartments 13 and between the multiple battery compartments 13 and the external environment.

[0089] In some possible implementations, such as Figures 2 to 5 as well as Figure 8 As shown, in the first direction, the third plate 128 is located at the midpoint between the first plate 126 and the second plate 127.

[0090] The third plate 128, which is located in the middle of the first plate 126 and the second plate 127 in the first direction, can be located in the middle of the entire partition 12 in the first direction. In this way, the left and right sides of the third plate 128 in the first direction can bear similar forces, which helps to reduce the stress concentration of the third plate 128.

[0091] In the battery housing 10 provided in this disclosure, the sealing member 21 of the first breathing device 20 can be driven by an external driving member to achieve the switching between the first state and the second state. The sealing member 21 can also move in the channel 125 using other driving methods, which are not limited in this disclosure.

[0092] For example, a linear motor is installed in one of the two adjacent battery compartments 13. The push rod of the linear motor can pass through the first hole 123 or the second hole 124 and connect to the sealing member 21. The linear motor is configured to reciprocate the push rod, driving the sealing member 21 to move within the partition 12 to seal the first hole 123 or the second hole 124, or to be located between the first hole 123 or the second hole 124 and the connecting hole 211, thereby enabling the first breathing device 20 to switch between a first state and a second state.

[0093] As one embodiment of this disclosure, the first breathing device 20 is configured to switch between a first state and a second state under the action of the pressure difference between the two battery compartments 13 on both sides of the corresponding separator 12.

[0094] Thus, without the need for additional drive components within the battery housing 10, the pressure difference between the two battery compartments 13 located on either side of the separator 12 enables the drive sealing component 21 to move within the channel 125, switching between the first and second states. This allows for pressure balance between the two adjacent battery compartments 13 and, in the event of thermal runaway in one of the battery modules 40, disconnection between the two adjacent battery compartments 13, preventing rapid propagation of thermal runaway. This simplifies the structure of the battery housing 10, reduces the weight of the battery pack using the battery housing 10, and consequently improves the energy density of the battery pack 100.

[0095] To facilitate the installation of the first breathing device 20 on the separator 12, in some possible embodiments, such as Figure 8 As shown, the first breathing device 20 also includes a mounting frame 22, which includes a support rod 221 and at least one connecting rod 222. The at least one connecting rod 222 spans across the first hole 123 and / or the second hole 124 and is connected to the separator 12. The support rod 221 is connected to the connecting rod 222 and extends along a first direction. The sealing member 21 is movably sleeved on the support rod 221 along the first direction to seal the first hole 123 or the second hole 124.

[0096] The support rod 221, which spans across the first hole 123 and / or the second hole 124 and is connected to the separator 12, can fix the connecting rod 222 on the separator 12.

[0097] Furthermore, the support rod 221 extending along the first direction can match the moving direction of the sealing member 21 and the spacing direction of the first hole 123 and the second hole 124. Thus, when the sealing member 21 moves along the first direction on the support rod 221, the sealing member 21 can connect or disconnect the two adjacent battery compartments 13.

[0098] In some possible implementations, such as Figure 8 As shown, there are two connecting rods 222, which are respectively straddling the first hole 123 and the second hole 124. The separator 12 is disposed between the two connecting rods 222, and both ends of the separator 12 are connected to the two connecting rods 222 respectively.

[0099] In other words, the support rod 221 can be connected to the partition 12 through two connecting rods 222, and the support rod 221 is reliably fixed on the partition 12, making it less likely to shake or fall off.

[0100] In addition, the two connecting rods 222 respectively set at both ends of the support rod 221 can also limit the sealing member 21 in the first direction, effectively preventing the sealing member 21 from falling off from the first hole 123 or the second hole 124 due to excessive pressure difference between the two adjacent battery compartments 13. In the event of thermal runaway of the battery module 40 in one of the battery compartments 13, the sealing member 21 will be unable to disconnect between the two battery compartments 13, further improving the reliability of the first breathing device 20.

[0101] In order to enable the sealing element 21 to move on the support rod 221, in some possible embodiments, such as Figures 3 to 6 As shown, the sealing component 21 includes a sealing disc 212, which has a through hole 211 so that the sealing disc 212 can be movably fitted onto the support rod 221.

[0102] In this way, the sealing component 21 can move on the support rod 221, but it is not easy to fall off the support rod 221.

[0103] In addition, the sealing disc 212 can be adapted to the shape and size of the first hole 123 and the second hole 124, which is conducive to sealing the first hole 123 or the second hole 124 in the second state.

[0104] To improve the sealing effect of the first breathing device 20 on the first hole 123 or the second hole 124, in some possible embodiments, such as Figures 3 to 6 As shown, the first breathing device 20 also includes at least one sealing element 23, which is connected to the plugging element 21 and is used to seal the gap between the plugging element 21 and the first hole 123 or the second hole 124.

[0105] By providing at least one sealing element 23 on the sealing element 21, the sealing element 23 can fill the gap between the sealing element 21 and the first hole 123 or the second hole 124 when the first breathing device 20 is in the second state. This is beneficial to improving the sealing effect of the sealing element 21 on the first hole 123 or the second hole 124. The gas that is thermally runaway is not easy to flow through the gap between the sealing element 21 and the first hole 123 or the second hole 124, which is beneficial to further improve the isolation effect between the two adjacent battery compartments 13 when thermal runaway occurs in one of the two adjacent battery compartments 13.

[0106] In some possible implementations, such as Figures 3 to 6 As shown, there are two seals 23, which are respectively disposed on both sides of the sealing member 21 in the axial direction. For example, the two seals 23 can be disposed on opposite sides of the sealing member 21 in the first direction.

[0107] The two sealing elements 23 disposed on both sides of the sealing element 21 along the axial direction can respectively seal the gap between the sealing element 21 and the first hole 123 and between the sealing element 21 and the second hole 124. In this way, when either of the two adjacent battery compartments 13 on both sides of the separator 12 experiences thermal runaway, the sealing element 21 and either the first hole 123 and the second hole 124 can have a good sealing effect, which is conducive to further improving the separation effect between the two adjacent battery compartments 13.

[0108] This disclosure does not limit the specific type of the seal 23; the seal 23 can be any seal 23 suitable for being disposed on the sealing member 21.

[0109] As one embodiment of this disclosure, the seal 23 is configured to expand when heated.

[0110] Thus, when one of the two adjacent battery compartments 13 experiences thermal runaway, the sealing element 23 can rapidly expand under the action of the high-temperature and high-pressure thermal runaway gas, filling the gap between the sealing element 21 and the first hole 123 or the second hole 124 and the channel 125 provided inside the separator 12, further improving the isolation effect between the two adjacent battery compartments 13.

[0111] For example, in an embodiment where the separator 12 has a first sidewall 121 and a second sidewall 122 disposed opposite to each other, the first sidewall 121 is provided with a first hole 123, the second sidewall 122 is provided with a second hole 124, and the separator 12 has a channel 125 disposed inside, when one of the two adjacent battery compartments 13 experiences thermal runaway, the two sealing elements 23 disposed on both sides of the sealing element 21 in the axial direction can rapidly expand. At this time, the two sealing elements 23 can be used to seal the sealing element 21 and the first hole 123 respectively. The gap between the sealing member 21 and the second hole 124, that is, the sealing member 21 and the sealing member 23 cooperate with each other to simultaneously seal the two side walls (i.e. the first side wall 121 and the second side wall 122) provided on the separator 12. That is, the sealing member 21 can simultaneously seal the first hole 123 on the first side wall 121 and the second hole 124 on the second side wall 122. The isolation effect of the two adjacent battery compartments 13 separated by the two side walls is better, which is conducive to further reducing the spread rate of thermal runaway of the two adjacent battery compartments 13.

[0112] When the battery pack 100 is in normal use, that is, when the first breathing device 20 is in the first state, the sealing member 21 and the sealing member 23 can also have gaps with the first hole 123 and the second hole 124, so as to achieve pressure balance between the two adjacent battery compartments 13 and between the battery compartment 13 and the external environment.

[0113] Alternatively, in an embodiment where the separator 12 is provided with a first plate 126, a second plate 127, and a third plate 128 spaced apart along a first direction, and the second plate 127 is provided with a connecting hole 211 for connecting the first hole 123 and the second hole 124, when one of the two adjacent battery compartments 13 experiences thermal runaway, the two sealing members 23 provided on both sides of the sealing member 21 in the axial direction can rapidly expand. At this time, the two sealing members 23 can be used to seal the sealing member 21 and the sealing member 24 respectively. The gap between the connecting hole 211 and the sealing member 21 and the first hole 123 or the second hole 124, that is, the sealing member 21 and the sealing member 23 cooperate with each other to simultaneously seal the two plates set in the separator 12. That is, the sealing member 21 can simultaneously seal the first plate 126 and the third plate 128 or the third plate 128 and the second plate 127. The isolation effect of the two adjacent battery compartments 13 separated by the two plates is better, which is conducive to further reducing the spread rate of thermal runaway of the two adjacent battery compartments 13.

[0114] When the battery pack 100 is in normal use, that is, when the first breathing device 20 is in the first state, there can be gaps between the sealing member 21 and the sealing member 23 and the first hole 123 and the connecting hole 211, as well as between the sealing member 21 and the sealing member 23 and the second hole 124 and the connecting hole 211, so as to achieve pressure balance between the two adjacent battery compartments 13 and between the battery compartment 13 and the external environment.

[0115] In some possible implementations, the seal 23 may be made of an expandable graphite plate.

[0116] Alternatively, in other embodiments provided in this disclosure, the seal 23 may also be made of materials such as fluororubber or silicone rubber, and this disclosure does not limit this.

[0117] In some possible implementations, such as Figure 5 As shown, in the embodiment provided with at least one separator 12 and at least one seal 23, the thickness of the sealing member 21 in the first direction is A, the minimum dimension of the channel 125 in the first direction is B, and the thickness of the at least one seal 23 in the first direction after thermal expansion is C. A, B, and C satisfy: A+C≥B, so that the at least one seal 23 can seal the channel 125 together with the sealing member 21 after thermal expansion.

[0118] Here, it should be noted that the thickness C of the sealing element 23 in the first direction refers to the overall thickness C of the sealing element 23 in the first direction. For example, in an embodiment where there are two seals, and the two seals 23 are respectively disposed on both sides of the sealing element 21, the thickness C of the sealing element 23 in the first direction is the sum of the thicknesses of the two seals 23 in the first direction. Figure 6 As shown, the thickness of both seals 23 in the second direction is C2, where C = C2 + C2. However, when the sealing element 21 and seal 23, which have a larger overall size in the first direction, are installed in channel 125, refer to... Figure 5 As shown, the seal 23 is subjected to the pushing and squeezing action of the first plate 126 and the second plate 127, and will undergo a certain deformation, thereby being tightly clamped between the first side wall 121 and the second side wall 122.

[0119] Thus, in such Figure 5 In the embodiment shown, when one of the two adjacent battery compartments 13 experiences thermal runaway, in the first direction, the overall thickness of the seal 23 and the plug 21 can be greater than the dimension of the channel 125 in the first direction, and the seal 23 and the plug 21 can be tightly clamped between the first sidewall 121 and the second sidewall 122, thereby simultaneously sealing the first hole 123 on the first sidewall 121 and the second hole 124 on the second sidewall 122.

[0120] Here, it can be understood that, in the embodiment where the separator 12 is provided with a first plate 126, a second plate 127 and a third plate 128 arranged at intervals along the first direction, the third plate 128 is located in the middle of the first plate 126 and the second plate 127, and the second plate 127 is provided with a connecting hole 211 for connecting the first hole 123 and the second hole 124, the thickness of the sealing member 21 in the first direction is A, the minimum dimension of the channel 125 in the first direction is B, and the thickness of the sealing member 23 in the first direction is C after the sealing member 23 is heated and expanded. A, B and C can also satisfy: A+C≥1 / 2B.

[0121] Thus, when thermal runaway occurs in one of the two adjacent battery compartments 13, the overall thickness of the seal 23 and the plug 21 in the first direction can be greater than half the dimension of the channel 125 in the first direction. That is, in the first direction, the overall thickness of the seal 23 and the plug 21 can be greater than the distance between the first plate 126 and the third plate 128 or the third plate 128 and the second plate 127. The seal 23 and the plug 21 can be tightly clamped between the first plate 126 and the third plate 128 or the third plate 128 and the second plate 127, thereby simultaneously achieving the sealing of the first plate 126 and the third plate 128 or the third plate 128 and the second plate 127.

[0122] To ensure that the other parts of the two battery compartments 13 separated by the separator 12 are sealed to each other, optionally, such as Figure 10 As shown, the housing 11 includes a tray 111, a top cover 112 and a housing seal 113. The top cover 112 is connected to the tray 111 and at least one partition 12 through the housing seal 113, so that the corresponding adjacent battery compartments 13 are connected only through the first breathing device 20.

[0123] The housing seal 113 can seal the gap between the top cover 112, the partition 12, and the tray 111, thereby enabling two adjacent battery compartments 13 to be connected only through the first breathing device 20, which can meet the sealing requirements between two adjacent battery compartments 13.

[0124] Furthermore, in an embodiment where the first breathing device 20 is configured to disconnect the connection between two adjacent battery compartments 13 when thermal runaway occurs in the battery pack 100, when thermal runaway occurs in the battery pack 100, the runaway gas can also be prevented from flowing to another battery compartment 13 through other locations between the two adjacent battery compartments 13, which helps to improve the effect of preventing the spread of thermal runaway and preventing the expansion of thermal runaway.

[0125] As mentioned above, in the battery housing 10 mentioned in this disclosure, any number of partitions 12 and battery compartments 13 can be provided inside the shell 11 of the battery housing 10, and this disclosure does not limit this. As an exemplary embodiment of this disclosure, such as Figure 1 , Figure 2 , Figure 9 as well as Figure 10 As shown, multiple battery compartments 13 are arranged at intervals along a first direction, and each partition 12 extends along a second direction. The first breathing device 20 is located in the middle of the partition 12 in the second direction, and the second direction intersects with the first direction.

[0126] For example, such as Figure 1 , Figure 2 , Figure 9 as well as Figure 10 As shown, there can be two battery compartments 13, which are arranged at intervals along the first direction and located on both sides of the partition 12 extending along the second direction.

[0127] Multiple battery compartments 13 spaced apart along the first direction can meet the requirement of distributed arrangement of battery modules 40 within the battery pack 100.

[0128] In addition, the first breathing device 20 located in the middle of the separator 12 in the second direction also helps to improve the pressure balance between the two adjacent battery compartments 13.

[0129] To achieve communication between the battery compartment 13 and the external environment of the battery pack 100, in some possible implementations, such as Figures 2 to 5 as well as Figure 8 As shown, the interior of the partition 12 is provided with a channel 125, and the first breathing device 20 and the second breathing device 30 are connected to the channel 125.

[0130] The aforementioned second breathing device 30 can be a breathing valve with explosion-proof function. In this way, the second breathing device 30 can not only achieve pressure balance between the battery compartment 13 and the external environment, but also have high safety when the gas is discharged in thermal runaway.

[0131] Since both the first breathing device 20 and the second breathing device 30 can be connected to the channel 125 in the partition 12, the first breathing device 20 and the channel 125 can connect the two adjacent battery compartments 13. The first breathing device 20, the channel 125 and the second breathing device 30 can also indirectly connect the battery compartment 13 to the external environment of the battery pack 100, thereby achieving pressure balance between the two adjacent battery compartments 13 and between the battery compartment 13 and the external environment.

[0132] Here, it can be understood that, in the embodiment where the separator 12 is provided with a first plate 126, a second plate 127, and a third plate 128 arranged at intervals along a first direction, and the second plate 127 is provided with a connecting hole 211 for connecting the first hole 123 and the second hole 124, the second breathing device 30 can be provided correspondingly to the third plate 128, and the portion of the channel 125 located between the first plate 126 and the third plate 128 and the portion of the channel 125 located between the second plate 127 and the third plate 128 can be simultaneously connected to the second breathing device 30.

[0133] In the battery pack 100 provided in this disclosure, the second breathing device 30 can be disposed at any position on the housing 11 of the battery box 10, and this disclosure does not limit this. As one embodiment of this disclosure, such as... Figure 1 , Figure 2 as well as Figure 9 As shown, the second breathing device 30 is disposed on the housing 11 corresponding to the partition 12.

[0134] By setting the second breathing device 30 on the housing 11 at the corresponding position of the separator 12, that is, by setting the second breathing device 30 on the housing 11 at a position with higher strength where the separator 12 is provided, it is beneficial to reduce the impact of setting the second breathing device 30 on the strength of the housing 11, thereby further improving the overall strength of the battery pack 100.

[0135] Furthermore, by placing the second breathing device 30 on the housing 11 at the corresponding position to the separator 12, it is also beneficial to shorten the distance between the second breathing device 30 and the channel 125. On the one hand, the shorter distance between the second breathing device 30 and the channel 125 is conducive to achieving pressure balance between the multiple battery compartments 13 and the external environment of the battery pack 100. On the other hand, when the battery module 40 in the battery compartment 13 experiences thermal runaway, the shorter distance between the second breathing device 30 and the channel 125 can also increase the discharge speed of the thermal runaway gas.

[0136] In some possible embodiments, the second breathing device 30 may communicate with both parts of the channel 125 simultaneously. The third plate 128 is capable of dividing the channel 125 located between the first plate 126 and the second plate 127 of the separator 12 into two parts. In the embodiment where the separator 12 includes a first plate 126, a second plate 127 and a third plate 128 arranged at intervals along a first direction, the third plate 128 may divide the channel 125 between the first plate 126 and the second plate 127 of the separator 12 into two parts.

[0137] The second breathing device 30, which is connected to both parts of the channel 125, facilitates ventilation between the two adjacent battery compartments 13. The airflow does not need to flow between the two parts of the channel 125, allowing the airflow to have a shorter path within the channel 125. This is beneficial for further improving the pressure balance between the two adjacent battery compartments 13 and the external environment of the battery pack 100, and also helps to improve the efficiency of exhausting gases in case of thermal runaway.

[0138] According to a second aspect of this disclosure, a battery pack is provided, including a battery housing 10 as described above and a plurality of battery modules 40, wherein each battery compartment 13 is provided with a battery module 40.

[0139] The battery pack 100 has all the beneficial effects of the battery housing 10 described above, which will not be repeated here.

[0140] According to a third aspect of this disclosure, an electrical device is provided, including a device body and a battery pack 100 as described above, the battery pack 100 being used to supply power to the device body.

[0141] This electrical device has all the beneficial effects of the aforementioned battery pack 100, which will not be elaborated here.

[0142] It should be noted that this disclosure does not limit the specific type of electrical equipment. The aforementioned electrical equipment can be a vehicle or any other electrical equipment suitable for using the aforementioned battery pack 100, and this disclosure does not limit it in this regard.

[0143] In one embodiment of this disclosure, the electrical equipment may be a vehicle. In this case, the main body of the equipment may be any part of the vehicle other than the battery pack 100. For example, the main body of the equipment may be a motor or the like on the vehicle.

[0144] In an implementation where the electrical equipment is a vehicle and the vehicle type is a range-extended vehicle, the second breathing device 30 may be disposed on the side of the battery housing 10 housing 11 away from the range extender of the vehicle.

[0145] In this way, during use, the second breathing device 30 is less susceptible to interference from the high temperature and vibration of the range extender, which helps to extend the service life of the second breathing device 30.

[0146] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0147] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A battery housing, characterized in that, It includes a housing, a first breathing device, a second breathing device, and at least one partition disposed within the housing; At least one of the separators is used to divide the cavity within the housing into multiple battery compartments for accommodating battery modules; At least one of the partitions is provided with the first breathing device, and two adjacent battery compartments are connected only through the first breathing device. The second breathing device is disposed in the housing, and at least one of the two adjacent battery compartments is in communication with the external environment of the battery pack through the second breathing device.

2. The battery housing according to claim 1, characterized in that, The first breathing device is also configured to disconnect the connection between two adjacent battery compartments in the event of thermal runaway of the battery pack.

3. The battery housing according to claim 2, characterized in that, Each of the partitions has opposing first and second sidewalls; The first sidewall is provided with a first hole, the second sidewall is provided with a second hole, and the interior of the separator is provided with a channel, and both the first hole and the second hole are connected to the channel; The first breathing device includes a sealing member movably disposed within the partition, so that the first breathing device has a first state and a second state; In the first state, the first hole is connected to the second hole through the channel, so that the corresponding adjacent battery compartments can be connected through the corresponding first breathing device; In the second state, the sealing member is configured to block the first hole or the second hole so that the connection between the corresponding two adjacent battery compartments can be disconnected through the first breathing device.

4. The battery housing according to claim 3, characterized in that, The separator includes a first plate, a second plate, and a third plate arranged at intervals along a first direction; The first plate and the third plate are both connected to the housing at both ends in the second direction. The side wall of the first plate away from the second plate is the first side wall, and the side wall of the third plate away from the second plate is the second side wall. The second direction intersects with the first direction. The first plate, the second plate, the third plate, and the housing together define the channel; The second plate is provided with a connecting hole, which is used to connect the first hole and the second hole. In the first state, there is a gap between the sealing member and the connecting hole, the first hole and the second hole.

5. The battery housing according to claim 3, characterized in that, The first breathing device is configured to switch between the first state and the second state under the pressure difference between the two battery compartments on both sides of the corresponding separator.

6. The battery housing according to claim 3, characterized in that, The first breathing device also includes a mounting bracket; The mounting bracket includes a support rod and at least one connecting rod, the at least one connecting rod spanning the first hole and / or the second hole and connected to the separator; The support rod is connected to the connecting rod and extends along a first direction. The sealing member is movably sleeved on the support rod along the first direction to seal the first hole or the second hole.

7. The battery housing according to claim 3, characterized in that, The first breathing device further includes at least one sealing element connected to the plugging element, the sealing element being used to seal the gap between the plugging element and the first or second hole.

8. The battery housing according to claim 7, characterized in that, The number of the sealing elements is two, and the two sealing elements are respectively disposed on both sides of the sealing element in the axial direction.

9. The battery housing according to claim 7, characterized in that, The seal is constructed to expand when heated.

10. The battery housing according to any one of claims 2-9, characterized in that, At least one of the separators is provided with a channel for connecting two corresponding adjacent battery compartments; The first breathing device includes a sealing element and at least one sealing element disposed on the sealing element; The thickness of the sealing element in the first direction is A; The minimum dimension of the channel in the first direction is B; The at least one seal is configured such that, when heated and expanded, its thickness in the first direction is C; A, B, and C satisfy: A+C≥B, so that the at least one sealing element can seal the channel together with the sealing element after thermal expansion.

11. The battery housing according to any one of claims 1-9, characterized in that, The plurality of battery compartments are arranged at intervals along a first direction, each of the partitions extends along a second direction, and the first breathing device is located at the middle of the partition in the second direction, the second direction intersecting the first direction.

12. The battery housing according to any one of claims 1-9, characterized in that, The partition has a channel inside, and both the first breathing device and the second breathing device are connected to the channel.

13. The battery housing according to any one of claims 1-9, characterized in that, The second breathing device is disposed on the housing corresponding to the partition.

14. The battery housing according to any one of claims 1-9, characterized in that, The housing includes a tray, a top cover, and a housing seal; The top cover is connected to the tray and the at least one separator via the housing seal, so that the corresponding adjacent battery compartments are connected only through the first breathing device.

15. A battery pack, characterized in that, Includes a battery housing and a plurality of battery modules according to any one of claims 1-14; Each of the battery compartments is equipped with the battery module.

16. An electrical appliance, characterized in that, Includes the main body of the device and the battery pack according to claim 15; The battery pack is used to supply power to the main body of the device.

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