Battery box body, battery pack and electric equipment

Abstract

The invention relates to a battery box body, a battery pack and electric equipment, the battery box body comprises a bottom plate structure used for installing a battery cell, the bottom plate structure comprises a supporting plate, a bottom protection plate and a connecting piece, an exhaust channel is arranged between the supporting plate and the bottom protection plate, the exhaust channel is used for exhausting gas from an explosion-proof valve of the battery cell, the connecting piece is located in the exhaust channel, and the connecting piece is connected with the bottom protection plate. And the connecting piece is used for connecting the supporting plate and the bottom protection plate and is arranged to be capable of disconnecting at least partial positions between the supporting plate and the bottom protection plate when the battery pack is subjected to thermal runaway. When the battery pack is in a normal use state, the connecting piece can prevent the bottom protection plate from falling due to the action of gravity, and the overall rigidity of the battery pack is improved. When the battery pack is subjected to thermal runaway, the connecting piece can disconnect at least part of the position between the supporting plate and the bottom protection plate, gas is allowed to expand the exhaust space of the exhaust channel, the battery pack subjected to thermal runaway can be better exhausted, and thermal runaway waste blockage and continuous temperature accumulation in the battery pack can be avoided.

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 such equipment. When thermal runaway occurs during the use of a power battery, a large amount of gas is generated within the battery pack and needs to be expelled from the cells. In related technologies, the venting channels of the battery pack are not ideal for venting gas during thermal runaway. Summary of the Invention

[0003] The purpose of this disclosure is to provide a battery enclosure, battery pack, and electrical device to at least partially solve the technical problems existing in the related art.

[0004] To achieve the above objectives, this disclosure provides a battery housing, including a base plate structure for mounting battery cells; The base plate structure includes a base plate, a support plate, and connectors; There is an exhaust channel between the support plate and the bottom protective plate, which is used to discharge gas from the explosion-proof valve of the battery cell; The connector is located inside the exhaust channel and is used to connect the support plate and the bottom protective plate; The connector is configured to disconnect the connection between the support plate and the bottom protective plate at least partially in the event of thermal runaway of the battery pack.

[0005] Optionally, the connector includes a support portion and an elastic portion; The support portion is used to provide support for the support plate and the bottom protective plate; When the battery pack is in normal use, the elastic part is in a compressed state, and the elastic part is used to provide a force that moves at least a portion of the support plate and the bottom cover away from each other.

[0006] Optionally, the two ends of the support are respectively connected to the support plate and the bottom protective plate; The two ends of the elastic part are respectively connected to the support plate and the bottom protective plate.

[0007] Optionally, the number of the support portions is multiple, and the multiple support portions are arranged at intervals between the support plate and the bottom protective plate; and / or, The number of elastic parts is multiple, and the multiple elastic parts are arranged at intervals between the support plate and the bottom protective plate; The supporting portion and the elastic portion are arranged at intervals.

[0008] Optionally, the elastic part includes a spring, which is sleeved on the outside of the support part.

[0009] Optionally, the support portion and the elastic portion are fitted together.

[0010] Optionally, the support portion has an internal receiving groove, and the elastic portion is embedded in the receiving groove.

[0011] Optionally, the first end face of the support portion is adapted to be connected to the support plate, and the second end face of the support portion is adapted to be connected to the bottom protective plate, with the first end face and the second end face facing each other; One end of the receiving groove penetrates the first end face, and the other end of the receiving groove penetrates the second end face.

[0012] Optionally, the connector may further include straps; The support portion and the elastic portion are arranged between the support plate and the bottom protective plate along the height direction of the battery pack; The strap is used to bind the support part and the elastic part together; Furthermore, the strap is configured to melt under the temperature effect during thermal runaway of the battery pack, or the strap is configured to melt due to a chemical reaction during thermal runaway of the battery pack.

[0013] Optionally, the number of the support parts is two, one of the two support parts is connected to the support plate, and the other of the two support parts is connected to the bottom protective plate; The elastic portion is provided between the two support portions.

[0014] Optionally, the two ends of the connector are respectively bonded to the support plate and the bottom protective plate, and the connector is configured to detach from at least one of the support plate and the bottom protective plate in the event of thermal runaway of the battery pack.

[0015] Optionally, the connector is configured to disconnect into at least two parts in the event of thermal runaway of the battery pack.

[0016] Optionally, the connector includes a support portion and a removable portion; The support portion and the fusible portion are arranged between the support plate and the bottom protective plate along the height direction of the battery pack; The fusible portion is configured to melt under the temperature conditions during thermal runaway of the battery pack, or the fusible portion is configured to undergo a chemical reaction and melt during thermal runaway of the battery pack.

[0017] Optionally, the number of the support portions is two; One of the two support parts is connected to the support plate, and the other of the two support parts is connected to the bottom protective plate; The two support portions are connected by the fusible portion.

[0018] Optionally, the number of the scalable parts is two; One of the two fusible parts is connected to the support plate, and the other of the two fusible parts is connected to the bottom protective plate; The two convertible parts are connected by the support.

[0019] Optionally, the connector is configured to support the connection between the support plate and the bottom cover plate at the temperature during normal use of the battery pack; Furthermore, the connector is configured to soften or melt under the temperature effects during thermal runaway of the battery pack.

[0020] Optionally, the support plate has a central region located at its own geometric center, and the number of connectors is multiple, including at least one connector whose projection in the height direction of the battery box is located within the central region.

[0021] Optionally, the support plate includes a flow channel plate and a mounting plate, the mounting plate being used to mount the battery cell, and the mounting plate and the flow channel plate being aligned and connected along the height direction of the battery box.

[0022] According to a second aspect of this disclosure, a battery pack is provided, including a battery cell and a battery housing, the battery housing having a receiving space, the battery cell being located within the receiving space, the bottom of the battery cell being mounted on a support plate, and the explosion-proof valve of the battery cell venting air through the venting channel.

[0023] According to a third aspect of this disclosure, an electrical device is provided, including the battery pack described above, the battery pack being used to supply power to the electrical device.

[0024] Through the above technical solution, the connector is located within the exhaust channel. When the battery pack is in normal use, the connector connects the support plate and the bottom protective plate, preventing the bottom protective plate from falling due to gravity. This prevents the bottom protective plate from being impacted due to insufficient ground clearance, thus protecting both the bottom protective plate and the battery pack. Furthermore, when the battery pack is in normal use, the connector also connects the support plate and the bottom protective plate, improving the overall rigidity of the battery pack.

[0025] When thermal runaway occurs in the battery pack, the connector can disconnect the connection between the support plate and the bottom cover plate at least partially, allowing the gas to expand the exhaust space of the exhaust channel. This allows the thermally runaway battery pack to vent better, which helps to avoid blockage of thermal runaway waste. This can prevent problems such as explosions caused by the inability to vent large amounts of gas during thermal runaway, as is the case in related technologies. Moreover, by increasing the space of the exhaust channel, the internal temperature of the battery pack can be reduced, preventing the continuous accumulation of internal temperature and thus avoiding excessively high internal temperatures.

[0026] Other features and advantages of this disclosure will be described in detail in the following illustrative section. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the various components of the base plate structure provided in an exemplary embodiment of the present disclosure, wherein the base frame is also shown; Figure 2 This is a schematic diagram of a support plate with connecting members arranged according to an exemplary embodiment of the present disclosure; Figure 3 This is a schematic diagram showing the disassembled components of a battery pack provided in an exemplary embodiment of this disclosure. Figure 4 This is a top view of a battery pack provided in an exemplary embodiment of this disclosure; Figure 5 yes Figure 4 Sectional view of AA; Figure 6 yes Figure 5 Enlarged schematic diagram of part B; Figure 7 This is a front view schematic diagram of a connector provided in an exemplary embodiment of the present disclosure; Figure 8 This is a front view schematic diagram of another connector provided in an exemplary embodiment of this disclosure; Figure 9 This is a front view schematic diagram of another connector provided in an exemplary embodiment of this disclosure; Figure 10 This is a front view schematic diagram of another connector provided in an exemplary embodiment of the present disclosure.

[0028] Explanation of reference numerals in the attached figures 100. Battery pack; 101. Battery housing; 102. Central area; 1. Base plate structure; 10. Bottom protective plate; 20. Support plate; 21. Through hole; 22. Flow channel plate; 23. Mounting plate; 30. Connector; 31. Support part; 311. Receiving groove; 32. Elastic part; 33. Chemical part; 34. Strap; 40. Venting channel; 50. Battery cell; 60. Structural adhesive; 70. Bottom frame; 80. Encapsulating adhesive; 90. Top cover. Detailed Implementation

[0029] The specific embodiments of this disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0030] It should be understood in this disclosure that, unless otherwise stated, directional terms such as "upper" and "lower" indicate orientation or positional relationships based on the drawing directions shown in the corresponding figures. These terms are used solely for ease of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational construction and operation. Therefore, they should not be construed as limitations on this disclosure. The terms "inner" and "outer" can refer to the inside or outside of the corresponding structural outline. Furthermore, it should be noted that terms such as "first," "second," and "third" are used to distinguish one element from another and do not have sequential or importance implications. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same element.

[0031] 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.

[0032] like Figures 1 to 10As shown, a battery housing 101 is provided, including a base plate structure 1 for mounting battery cells 50. The base plate structure 1 includes a bottom protective plate 10, a support plate 20, and a connector 30. An exhaust channel 40 is provided between the support plate 20 and the bottom protective plate 10. The exhaust channel 40 is used to discharge gas from the explosion-proof valve of the battery cell 50. The connector 30 is located in the exhaust channel 40 and is used to connect the support plate 20 and the bottom protective plate 10. The connector 30 is configured to disconnect the connection between the support plate 20 and the bottom protective plate 10 at least partially when thermal runaway occurs in the battery pack 100, so that the space of the exhaust channel 40 can be expanded. For example, under the action of gas in the exhaust channel 40, the support plate 20 and / or the bottom protective plate 10 deform, thereby expanding the space of the exhaust channel 40. As an example, in the embodiment where the two ends of the support portion 31 are respectively connected to the support plate 20 and the bottom protective plate 10, and the two ends of the elastic portion 32 are respectively connected to the support plate 20 and the bottom protective plate 10, the phrase "disconnecting the connection between the support plate 20 and the bottom protective plate 10 at least partially" can refer to at least disconnecting the connection between the support plate 20 and the bottom protective plate 10 achieved through the support portion 31.

[0033] It is understandable that the gas from the explosion-proof valve of cell 50 can be a mixture of gaseous and solid substances.

[0034] In addition, a suitable structure can be provided on the support plate 20 to connect the explosion-proof valve of the battery cell 50 with the exhaust channel 40. For example, a through hole 21 can be provided, or a fusible part with a relatively low melting point that can melt under the thermal runaway temperature of the battery pack 100 can be provided, or a weak part that can be opened under the action of thermal runaway gas can be provided. The exhaust channel 40 and the explosion-proof valve of the battery cell 50 can be connected through the above structure to complete the exhaust of the explosion-proof valve of the battery cell 50.

[0035] It is understandable that disconnecting the support plate 20 and the bottom protective plate 10 here could be: In at least a portion of the exhaust passage 40, the connector 30 is detached from at least one of the support plate 20 and the bottom guard plate 10, or a portion of the connector 30 itself is disassembled so that the connector 30 is disassembled into different parts, which is not limited in this disclosure.

[0036] In this disclosure, the space formed between the support plate 20 and the bottom protective plate 10 serves as an exhaust channel 40 for the explosion-proof valve of the power supply core 50. The connector 30 is disposed within the exhaust channel 40. When the battery pack 100 is in normal use, the connector 30 connects the support plate 20 and the bottom protective plate 10, limiting the distance between them. This limits the dimension of the exhaust channel 40 in the height direction of the battery pack 100, preventing the bottom protective plate 10 from falling due to gravity and avoiding impacts due to insufficient ground clearance, thus protecting both the bottom protective plate 10 and the battery pack 100. Furthermore, when the battery pack 100 is in normal use, the connector 30 connects the support plate 20 and the bottom protective plate 10, improving the overall rigidity of the battery pack 100.

[0037] When the battery pack 100 experiences thermal runaway, the connector 30 can disconnect the connection between the support plate 20 and the bottom protective plate 10 at least partially. That is, the support plate 20 and the bottom protective plate 10 are not connected by a restrictive structure in at least part of the exhaust channel 40. When the thermal runaway gas from the battery pack 100 rushes into the exhaust channel 40, the gas is allowed to expand the exhaust space of the exhaust channel 40, thereby allowing the thermally runaway battery pack 100 to exhaust better. This helps to avoid blockage by thermal runaway waste, thus avoiding problems such as explosions caused by the inability to exhaust large amounts of thermally runaway gas in related technologies. Moreover, by increasing the space of the exhaust channel 40, the internal temperature of the battery pack 100 can be reduced, preventing the continuous accumulation of internal temperature and thus avoiding excessively high internal temperatures of the battery pack 100.

[0038] When the connection between the support plate 20 and the bottom guard plate 10 at the exhaust channel 40 is disconnected, the connector 30 may be disconnected from the support plate 20 alone, or from the bottom guard plate 10 alone, or from both the support plate 20 and the bottom guard plate 10 simultaneously. This disclosure does not limit this.

[0039] Among them, the battery cell 50 can be any number of battery cells assembled together, or it can be a battery module composed of multiple battery cells or other suitable structures.

[0040] In some embodiments, the connection between the connector 30 and the support plate 20 and the bottom protective plate 10 can be a suitable connection method such as bonding, hot-melt connection or welding, wherein the connection method is configured such that the gas in the event of thermal runaway of the battery pack 100 can at least cause the connector 30 to detach from one of the support plate 20 and the bottom protective plate 10.

[0041] In this disclosure, the battery pack 100 can have two states: a first state is the normal use state of the battery pack 100, and a second state is the thermal runaway state of the battery pack 100. In the first state, the bottom protective plate 10 and the support plate 20 are connected by a connector 30; in the second state, the bottom protective plate 10 and the support plate 20 are disconnected at the portion corresponding to the exhaust channel 40.

[0042] In some embodiments of this disclosure, such as Figure 2 , Figure 6 and Figure 7 As shown, the connector 30 may include a support portion 31 and an elastic portion 32. The support portion 31 provides support for the support plate 20 and the bottom protective plate 10. When the battery pack 100 is in normal use, the elastic portion 32 is in a compressed state. The elastic portion 32 provides a force that moves at least a portion of the support plate 20 and the bottom protective plate 10 away from each other, that is, at least a portion of the support plate 20 corresponding to the bottom protective plate 10 can deform in this moving away direction under the action of the elastic portion 32. With this configuration, in the normal use state, the support portion 31 connects the support plate 20 and the bottom protective plate 10, defines the distance between them in the height direction of the battery pack 100, and ensures the stability of the connection between the support plate 20 and the bottom protective plate 10. The elastic portion 32 is compressed between the support plate 20 and the bottom protective plate 10. When the battery pack 100 is in a thermal runaway state, the connector 30 is disengaged from at least one of the support plate 20 and the bottom protective plate 10, or the connector 30 itself is disconnected. Then there is no restrictive structure between the support plate 20 and the bottom protective plate 10. The compressed elastic part 32 releases its elastic force and pushes the support plate 20 and the bottom protective plate 10 in the exhaust channel 40 in a direction away from each other, so as to expand the exhaust channel 40 and ensure the gas is discharged when the battery pack 100 is in thermal runaway.

[0043] The elastic part 32 is in a compressed state because the support part 31 limits the distance between the support plate 20 and the bottom protective plate 10 in the height direction of the battery pack 100. In this state, the elastic part 32 stores potential energy. When the limitation is removed, the elastic part 32 will try to return to its original length, thereby releasing the stored energy.

[0044] In this disclosure, such as Figure 6 The two ends of the support portion 31 shown can be connected to the support plate 20 and the bottom protective plate 10 respectively, and the two ends of the elastic portion 32 can be connected to the support plate 20 and the bottom protective plate 10 respectively. This arrangement facilitates the arrangement of the support portion 31 and the elastic portion 32. At the same time, since the two ends of the support portion 31 and the elastic portion 32 are respectively connected to the support plate 20 and the bottom protective plate 10, the reliability of the support portion 31 and the elastic portion 32 installed between the support plate 20 and the bottom protective plate 10 can be guaranteed.

[0045] In this disclosure, such as Figure 2 As shown, there can be multiple support portions 31, which are spaced apart between the support plate 20 and the bottom cover plate 10. Similarly, there can be multiple elastic portions 32, also spaced apart between the support plate 20 and the bottom cover plate 10. The connecting portion 31 and the elastic portion 32 are also spaced apart, meaning they are laid flat between the bottom cover plate 10 and the support plate 20. This ensures both the supporting effect of the connecting portion 30 and the expanding effect of the elastic portion 32, thereby enlarging the exhaust passage 40. Furthermore, separating the support portions 31 and the elastic portion 32 facilitates the selection of the elastic component based on the force required to expand the exhaust passage 40 using the support plate 20 and the bottom cover plate 10.

[0046] In some embodiments, the multiple support portions 31 are arranged at equal intervals, the multiple elastic portions 32 are arranged at equal intervals, or the multiple support portions 31 and the multiple elastic portions 32 are arranged at equal intervals, so as to ensure that the elastic portions 32 and the support portions 31 are subjected to uniform force.

[0047] In this disclosure, the elastic part 32 may include a spring, which is sleeved on the outside of the support part 31. In this case, the support part 31 serves as a mounting member for the elastic part 32 and may be constructed as a columnar member. This facilitates the installation of the elastic part 32 and the support part 31 without affecting the elastic effect of the elastic part 32.

[0048] In this disclosure, such as Figure 7 As shown, the support part 31 and the elastic part 32 can be fitted together. This arrangement allows the relative position between the two to be determined, which is beneficial for their installation.

[0049] This disclosure specifies the arrangement of the mounting positions of the support portion 31 and the elastic portion 32, such as... Figure 7 As shown, in some embodiments of this disclosure, the support portion 31 may have a receiving groove 311 inside, and the elastic portion 32 is embedded in the receiving groove 311. This arrangement, with the elastic portion 32 placed inside the receiving groove 311, facilitates the installation of both components and reduces the connection process. That is, it allows for direct placement of the elastic portion 32 using the receiving groove 311 without the need for adhesive bonding or other connections.

[0050] In this disclosure, such as Figure 7 As shown, the first end face of the support portion 31 is adapted to be connected to the support plate 20, and the second end face of the support portion 31 is adapted to be connected to the bottom protective plate 10. The first end face and the second end face are opposite to each other. One end of the receiving groove 311 passes through the first end face, and the other end of the receiving groove 311 passes through the second end face. That is, the receiving groove 311 is set as a through groove that passes through the support portion 31. In this way, the elastic portion 32 can be directly connected between the support plate 20 and the bottom protective plate 10, ensuring the support effect of the elastic portion 32.

[0051] In some other embodiments, the receiving groove 311 can also be configured as a blind hole groove, so that the elastic part 32 and the support part 31 can be installed before being installed on the support plate 20 and the bottom guard plate 10, preventing the elastic part 32 from falling out of the receiving groove 311.

[0052] In this disclosure, the two ends of the connector 30 can be respectively bonded to the support plate 20 and the bottom protective plate 10, and the support portion 31 is configured to detach from at least one of the support plate 20 and the bottom protective plate 10 when the battery pack 100 experiences thermal runaway. For example, a suitable adhesive can be selected such that when the battery pack 100 is in normal use, the adhesive strength allows the two ends of the connector 30 to be normally connected to the support plate 20 and the bottom protective plate 10, respectively. However, during thermal runaway, the adhesive strength fails or decreases, for example, due to the influence of high temperature, thereby enabling the connector 30 to detach from at least one of the support plate 20 and the bottom protective plate 10.

[0053] In this disclosure, such as Figure 8 As shown, the connector 30 may further include a strap 34. The support portion 31 and the elastic portion 32 are arranged between the support plate 20 and the bottom protective plate 10 along the height direction of the battery pack 100. The strap 34 is used to bind the support portion 31 and the elastic portion 32 together. Furthermore, the strap 34 is configured to melt under the temperature reached during thermal runaway of the battery pack 100, or the strap 34 is configured to undergo a chemical reaction and melt during thermal runaway of the battery pack 100, that is, at this time the connector 30 itself breaks into different parts. With this configuration, when the battery pack 100 is in normal use, the support portion 31 connects the support plate 20 and the bottom protective plate 10, limiting the distance between them in the height direction of the battery pack 100, ensuring the stability of the connection between the two, and the elastic portion 32 is compressed between them. When the battery pack 100 is in a state of thermal runaway, the strap 34 melts or breaks, and the compressed elastic part 32 releases its elastic force, pushing the support plate 20 and the bottom guard plate 10 in the exhaust channel 40 in a direction away from each other, so as to expand the exhaust channel 40.

[0054] In this disclosure, such as Figure 8 As shown, the number of support parts 31 can be set to two. One of the two support parts 31 is connected to the support plate 20, and the other of the two support parts 31 is connected to the bottom protective plate 10. An elastic part 32 is provided between the two support parts 31. This arrangement ensures the reliability of the connection between the support parts 31 and the elastic part 32. When the battery pack 100 is in a thermal runaway state, the strap 34 melts or breaks, and the compressed elastic part 32 releases its elastic force, pushing the two support parts 31. The two support parts 31 are respectively connected to the support plate 20 and the bottom protective plate 10. The movement of the two support parts 31 can push the support plate 20 and the bottom protective plate 10 in the exhaust channel 40 in a direction away from each other, so as to expand the exhaust channel 40.

[0055] In this disclosure, the connector 30 can be configured to disconnect itself into at least two parts in the event of thermal runaway of the battery pack 100. This allows the connector 30 to disconnect the connection between the support plate 20 and the bottom cover plate 10 even without detaching from it, meaning that the connection force requirements at the connection point between the connector and the support plate 20 or the bottom cover plate 10 are not stringent.

[0056] In this disclosure, such as Figure 9 and Figure 10 As shown, the connector 30 may include a support portion 31 and a meltable portion 33. The support portion 31 and the meltable portion 33 are arranged between the support plate 20 and the bottom protective plate 10 along the height direction of the battery pack 100. The meltable portion 33 is configured to melt under the temperature effect during thermal runaway of the battery pack 100, or the meltable portion 33 is configured to melt through a chemical reaction during thermal runaway of the battery pack 100. That is, when the battery pack 100 is in normal use, the meltable portion 33 remains rigid, and the connector 30 as a whole remains rigid to connect the support plate 20 and the bottom protective plate 10, limiting the distance between the two in the height direction of the battery pack 100 and ensuring the stability of the connection between the two. When the battery pack 100 is in a thermal runaway state, the fusible part 33 melts or breaks, that is, the connector 30 breaks itself. Since the connector 30 is arranged between the support plate 20 and the bottom protective plate 10 along the height direction of the battery pack 100, the connection between the connector 30 and the support plate 20 and the bottom protective plate 10 at the exhaust channel 40 position, that is, the support plate 20 and the bottom protective plate 10 at least part of the exhaust channel 40 do not have a restrictive structure for mutual connection. Therefore, the gas of the thermal runaway battery pack 100 can expand the size of the exhaust channel 40, so that the thermal runaway battery pack 100 can exhaust better, thereby expanding the exhaust channel 40.

[0057] In this disclosure, such as Figure 8 As shown, the number of support parts 31 can be set to two. One of the two support parts 31 is connected to the support plate 20, and the other of the two support parts 31 is connected to the bottom protective plate 10. The two support parts 31 are connected by a flexible part 33. This arrangement can ensure the rigidity of the connector 30 under normal use of the battery pack 100.

[0058] That is, when the battery pack 100 is in normal use, the convertible part 33 remains rigid, and the connector 30 as a whole remains rigid to connect the support plate 20 and the bottom protective plate 10. The two support parts 31 are respectively connected to the support plate 20 and the bottom protective plate 10 to ensure the stability of the connection between the support plate 20 and the bottom protective plate 10. When the battery pack 100 is in a thermal runaway state, the convertible part 33 melts or breaks, that is, the connection restriction between the support plate 20 and the bottom protective plate 10 is removed. At this time, the two support parts 31 are respectively connected between the support plate 20 and the bottom protective plate 10, and the two support parts 31 are disengaged to complete the separation between the support plate 20 and the bottom protective plate 10.

[0059] In this disclosure, the number of fusible parts 33 can be set to two. One of the two fusible parts 33 is connected to the support plate 20, and the other of the two fusible parts 33 is connected to the bottom protective plate 10. The two fusible parts 33 are connected by the support part 31. This arrangement can ensure the reliability of the connector 30 in the event of its own breakage.

[0060] That is, when the battery pack 100 is in its first state, the malleable portion 33 remains rigid, and the connector 30 as a whole remains rigid to connect the support plate 20 and the bottom protective plate 10. The two malleable portions 33 are respectively connected to the support plate 20 and the bottom protective plate 10, ensuring the stability of the connection between the support plate 20 and the bottom protective plate 10. When the battery pack 100 is in a thermal runaway state, the malleable portion 33 melts or breaks, that is, the connection restriction between the support plate 20 and the bottom protective plate 10 is removed. At this time, the two malleable portions 33 are respectively detached from the support plate 20 and the bottom protective plate 10, thereby completing the detachment between the support plate 20 and the bottom protective plate 10.

[0061] In this disclosure, the connector 30 can be configured to support and connect the support plate 20 and the bottom protective plate 10 at the temperature when the battery pack 100 is in normal use, and the connector 30 can be configured to soften or melt under the temperature effect of thermal runaway of the battery pack 100. That is, the entire connector 30 can be constructed of a material that can melt or break under high temperature or chemical reaction. That is, when the battery pack 100 is in normal use, the connector 30 has a rigid state and can connect the support plate 20 and the bottom protective plate 10. When the battery pack 100 is in thermal runaway, it melts or breaks to separate the support plate 20 and the bottom protective plate 10.

[0062] The strap 34, the fusible part 33, or the entire connector 30 can be made of a high-temperature fusible material. This material can be, for example, a substance that remains rigid within a temperature range of 80 degrees Celsius to -40 degrees Celsius, has a certain energy absorption capacity under compression (i.e., can absorb energy when compressed), and softens or melts rapidly at temperatures greater than or equal to 200 degrees Celsius. Suitable materials include closed-cell foam, polyurethane foam, polyethylene foam, thermoplastic elastomers, polyester elastomers, and EVA foam. Alternatively, it can be a material that can undergo a chemical reaction with substances emitted during thermal runaway of the battery pack 100, causing it to melt, break, or soften.

[0063] In this disclosure, such as Figure 2 As shown, the support plate 20 has a central region 102 located at its geometric center, and a plurality of connectors 30 are provided. Among the plurality of connectors 30, the projected portion of the battery pack 100 along its height direction is located within the central region 102. Connectors 30 that can connect to the support plate 20 and the bottom protective plate 10 during normal use of the battery pack 100, and detach from the support plate 20 and the bottom protective plate 10 during thermal runaway of the battery pack 100, are positioned in the central region 102 at the geometric center of the support plate 20. This allows for expansion of the support plate 20 and the bottom protective plate 10 at their intermediate positions, while minimizing the impact on the connection at the edges of the support plate 20 and the bottom protective plate 10.

[0064] In some embodiments, an elastic element 32 (e.g., a spring) can be arranged in the middle 1 / 3 area of ​​the large surface of the bottom guard plate 10. The springs are evenly arranged like the support parts 31. The greater the spring compression and rebound force, the better the effect of expanding the support plate 20 and the bottom guard plate 10. That is, when the support part 31 is blown open by the high temperature and high pressure of thermal runaway, the spring will expand the bottom guard plate 10 to the maximum, ensuring the maximization of the thermal runaway exhaust channel 40, which helps to avoid the risk of thermal runaway waste blockage and temperature accumulation.

[0065] In this disclosure, such as Figure 3 and Figure 4 As shown, the support plate 20 may include a flow channel plate 22 and a mounting plate 23. The mounting plate 23 is used to mount the battery cell 50, and the mounting plate 23 and the flow channel plate 22 are aligned and connected along the height direction of the battery pack. This facilitates the installation of the internal structure of the battery pack 100. That is, the support plate 20 can be constructed as a liquid cooling plate.

[0066] The support plate 20 can be provided with a through hole 21 to connect the explosion-proof valve of the battery cell 50 and the exhaust channel 40. For example, the through hole 21 may include a first through hole located on the mounting plate 23 and a second through hole located on the flow channel plate. The second through hole and the first through hole are arranged to form a through hole 21, which is used to exhaust the battery cell 50 through the explosion-proof valve.

[0067] According to the second aspect of this disclosure, such as Figure 3 and Figure 4 As shown, a battery pack 100 is provided, which may include a battery cell 50 and a battery housing 101. The battery housing has a receiving space, and the battery cell 50 is located within the receiving space. The bottom of the battery cell 50 is mounted on a support plate 20. The explosion-proof valve of the battery cell 50 vents gas through an exhaust channel 40. For example, the explosion-proof valve of the battery cell 50 can be connected to the exhaust channel through the aforementioned through hole 21, thereby realizing the venting through the exhaust channel 40. When the battery pack 100 is in a thermal runaway state, a large amount of gas ejected from the explosion-proof valve can pass through the enlarged exhaust channel 40.

[0068] In this disclosure, the support plate 20 may include or be configured as a liquid cooling plate, thereby ensuring the heat exchange effect of the battery pack 100.

[0069] The battery housing 101 also includes a bottom frame 70 and a top cover 90. The bottom frame 70 is connected to the base plate structure 1, and the top cover 90 is disposed at the upper end of the bottom frame 70. The bottom frame 70, the base plate structure 1, and the top cover 90 together define a space for installing the battery cell 50.

[0070] In some embodiments, the battery pack 100 may further include structural adhesive 60, and the support plate 20 has a through hole 21 communicating with the exhaust channel 40. The through hole 21 allows gas from the explosion-proof valve of the battery cell 50 to pass through, and the battery cell 50 is connected to the support plate 20 by the structural adhesive 60. The battery pack 100 may also include potting compound 80 and a top cover 90. The top cover 90 covers the upper part of the receiving space, and the potting compound 80 fills the receiving space and connects to the top cover 90.

[0071] The top cover 90 of the battery pack 100 can be made of suitable materials such as sheet metal, liquid cooling plate, or composite materials. The structural adhesive 60 can effectively fill the narrow spaces inside the battery pack, increasing the high-voltage creepage distance and improving the overall pack's pressure resistance. The potting compound 80 connects the internal structural components of the battery pack 100 with the external components and the high-strength structure such as the top cover 90 into a whole, improving the overall pack's rigidity.

[0072] According to a third aspect of this disclosure, an electrical device is provided, including a battery pack 100 for supplying power to the main body of the electrical device. Here, the electrical device may be a vehicle or any other device suitable for using the battery pack 100, and this disclosure does not limit it.

[0073] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0074] 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.

[0075] 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, Including the base plate structure for mounting the battery cells; The base plate structure includes a base plate, a support plate, and connectors; There is an exhaust channel between the support plate and the bottom protective plate, which is used to discharge gas from the explosion-proof valve of the battery cell; The connector is located inside the exhaust channel and is used to connect the support plate and the bottom protective plate; The connector is configured to disconnect the connection between the support plate and the bottom protective plate at least partially in the event of thermal runaway of the battery pack.

2. The battery housing according to claim 1, characterized in that, The connector includes a support portion and an elastic portion; The support portion is used to provide support for the support plate and the bottom protective plate; When the battery pack is in normal use, the elastic part is in a compressed state, and the elastic part is used to provide a force that moves at least a portion of the support plate and the bottom cover away from each other.

3. The battery housing according to claim 2, characterized in that, The two ends of the support are respectively connected to the support plate and the bottom protective plate; The two ends of the elastic part are respectively connected to the support plate and the bottom protective plate.

4. The battery housing according to claim 3, characterized in that, The number of the support parts is multiple, and the multiple support parts are arranged at intervals between the support plate and the bottom protective plate; and / or, The number of elastic parts is multiple, and the multiple elastic parts are arranged at intervals between the support plate and the bottom protective plate; The supporting portion and the elastic portion are arranged at intervals.

5. The battery housing according to claim 3, characterized in that, The elastic part includes a spring, which is sleeved on the outside of the support part.

6. The battery housing according to claim 2, characterized in that, The support portion and the elastic portion are fitted together.

7. The battery housing according to claim 6, characterized in that, The support portion has an internal receiving groove, and the elastic portion is embedded in the receiving groove.

8. The battery housing according to claim 7, characterized in that, The first end face of the support portion is adapted to be connected to the support plate, and the second end face of the support portion is adapted to be connected to the bottom protective plate, with the first end face and the second end face facing each other; One end of the receiving groove penetrates the first end face, and the other end of the receiving groove penetrates the second end face.

9. The battery housing according to claim 2, characterized in that, The connector also includes straps; The support portion and the elastic portion are arranged between the support plate and the bottom protective plate along the height direction of the battery pack; The strap is used to bind the support part and the elastic part together; Furthermore, the strap is configured to melt under the temperature effect during thermal runaway of the battery pack, or the strap is configured to melt due to a chemical reaction during thermal runaway of the battery pack.

10. The battery housing according to claim 9, characterized in that, The number of the support parts is two, one of the two support parts is connected to the support plate, and the other of the two support parts is connected to the bottom protective plate; The elastic portion is provided between the two support portions.

11. The battery housing according to claim 1, characterized in that, The two ends of the connector are respectively bonded to the support plate and the bottom protective plate, and the connector is configured to detach from at least one of the support plate and the bottom protective plate in the event of thermal runaway of the battery pack.

12. The battery housing according to claim 1, characterized in that, The connector is configured to break itself into at least two parts in the event of thermal runaway of the battery pack.

13. The battery housing according to claim 12, characterized in that, The connector includes a support portion and a flexible portion; The support portion and the fusible portion are arranged between the support plate and the bottom protective plate along the height direction of the battery pack; The fusible portion is configured to melt under the temperature conditions during thermal runaway of the battery pack, or the fusible portion is configured to undergo a chemical reaction and melt during thermal runaway of the battery pack.

14. The battery housing according to claim 13, characterized in that, The number of the support components is two; One of the two support parts is connected to the support plate, and the other of the two support parts is connected to the bottom protective plate; The two support portions are connected by the fusible portion.

15. The battery housing according to claim 13, characterized in that, The number of the fusible parts is two; One of the two fusible parts is connected to the support plate, and the other of the two fusible parts is connected to the bottom protective plate; The two convertible parts are connected by the support.

16. The battery housing according to claim 1, characterized in that, The connector is configured to support the connection between the support plate and the bottom protective plate at the temperature when the battery pack is in normal use. Furthermore, the connector is configured to soften or melt under the temperature effects during thermal runaway of the battery pack.

17. The battery housing according to any one of claims 1-16, characterized in that, The support plate has a central region located at its geometric center, and there are multiple connectors, including at least one connector whose projection in the height direction of the battery box is located within the central region.

18. The battery housing according to any one of claims 1-16, characterized in that, The support plate includes a flow channel plate and a mounting plate. The mounting plate is used to mount the battery cells, and the mounting plate and the flow channel plate are aligned and connected along the height direction of the battery box.

19. A battery pack, characterized in that, The battery includes a battery cell and a battery housing according to any one of claims 1-18, the battery housing having a receiving space, the battery cell being located within the receiving space, the bottom of the battery cell being mounted on the support plate, and the explosion-proof valve of the battery cell venting through the venting channel.

20. An electrical appliance, characterized in that, Includes the battery pack according to claim 19.

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