Battery box body, battery and electric device

Abstract

The utility model provides a battery box body, a battery and a power utilization device. The battery box body comprises a box body, partition plates and supporting pieces, the box body comprises a bottom plate and a cavity located on the bottom plate, the partition plates are located in the cavity and arranged on the bottom plate at intervals in the first direction so as to divide the cavity into an electrical cavity and an exhaust cavity, and the electrical cavity is located on the side, away from the bottom plate, of the partition plates and used for containing single batteries; the exhaust cavity is located on the side, facing the bottom plate, of the partition plate and used for collecting emissions of the single batteries, a supporting piece is arranged in the exhaust cavity, and the supporting piece is supported on the bottom plate and / or the partition plate in the first direction so that the deformation resistance of the partition plate can be improved, and the situation that when the batteries are in thermal runaway, under the pressure effect is improved. The problem that the volume of the exhaust cavity is reduced due to bending deformation of the partition plate, so that part of high-temperature ejected objects do not enter the exhaust cavity, and other single batteries are damaged is solved, and the reliability of the battery box body is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box, a battery and an electrical device. Background Art

[0002] Lithium-ion power batteries have the properties of high operating voltage, high specific energy, small size, light weight, long cycle life, low self-discharge rate, no memory effect, and no pollution, so they are used by many power equipment manufacturers. With the vigorous development of lithium batteries, the safety of batteries has also received widespread attention.

[0003] In a lithium battery system, when some battery cells thermally run away, in order to reduce the damage of the runaway battery cells to other normal battery cells, a receiving chamber is usually provided in the battery box to contain the high-temperature ejecta ejected from the runaway battery cells.

[0004] However, the storage capacity of the accommodating chamber in the prior art for high-temperature ejecta is insufficient, and its reliability still needs to be improved. Utility Model Content

[0005] In view of the above problems, the present application provides a battery case, a battery and an electrical device, which can improve the capacity of the accommodating cavity in the battery case to accommodate high-temperature ejecta and increase the service life of the battery.

[0006] In a first aspect, the present application provides a battery box, comprising: a box body, comprising a bottom plate and a chamber located on the bottom plate; a partition, the partition is located in the chamber and is arranged on the bottom plate at intervals along a first direction to divide the chamber into an electrical chamber and an exhaust chamber, the electrical chamber is located on the side of the partition away from the bottom plate, the electrical chamber is used to accommodate battery cells, and the exhaust chamber is used to collect emissions from the battery cells; a support member, located in the exhaust chamber, the support member is supported on the bottom plate and / or the partition along the first direction.

[0007] In the scheme of the embodiment of the present application, the battery box includes a box body, a partition and a support member. The box body includes a bottom plate and a chamber located on the bottom plate. The partition is located in the chamber and is arranged on the bottom plate at intervals along a first direction to divide the chamber into an electrical chamber and an exhaust chamber. The electrical chamber is located on the side of the partition away from the bottom plate, and the electrical chamber is used to accommodate battery cells. The exhaust chamber is located on the side of the partition facing the bottom plate, and the exhaust chamber is used to collect emissions from the battery cells. A support member is arranged in the exhaust chamber. The support member is supported on the bottom plate and / or the partition along the first direction to improve the deformation resistance of the partition, so as to improve the problem that when the battery is thermally runaway, the partition bends and deforms under pressure to reduce the volume of the exhaust chamber, so that some high-temperature ejecta do not enter the exhaust chamber, while other battery cells are damaged, thereby improving the reliability of the battery box.

[0008] In some embodiments, the partition is provided with a pressure relief portion, the support member has an avoidance portion, and the avoidance portion and the pressure relief portion are arranged opposite to each other along the first direction.

[0009] In the scheme of the embodiment of the present application, the partition is provided with a pressure relief portion, which is used to correspond to the pressure relief structure of the battery cell, and the avoidance portion and the pressure relief portion are arranged relative to each other along a first direction, so that the battery discharge can enter the exhaust chamber through the pressure relief portion and the avoidance portion. Therefore, the avoidance portion and the pressure relief portion of the support member are arranged relative to each other along the first direction. When the pressure relief portion is not operating, the support member improves the deformation resistance of the partition near the pressure relief portion, and when the pressure relief portion is operating, the discharge can quickly enter the exhaust chamber through the avoidance portion, thereby improving the reliability of the battery case.

[0010] In some embodiments, the avoidance portion is a first through hole, one end of the first through hole is arranged toward the pressure relief portion, and / or the avoidance portion is a meltable channel.

[0011] In the solution of the embodiment of the present application, the avoidance portion is a first through hole, so that the battery discharge passes through the pressure relief portion through the first through hole into the exhaust cavity, thereby increasing the pressure relief speed and improving the reliability of the battery case, and / or the avoidance portion is a meltable channel, so that the battery discharge passes through the pressure relief portion to melt the avoidance portion to enter the exhaust cavity, so that when the avoidance portion is not melted, the support portion provides a better support effect for the partition.

[0012] In some embodiments, the partition is provided with a pressure relief portion, and along the first direction, the support member and the pressure relief portion are staggered in projection.

[0013] In the solution of the embodiment of the present application, the partition is provided with a pressure relief portion so that the exhaust of the battery cell can enter the exhaust chamber through the pressure relief portion, and the support member and the pressure relief portion are staggered along the projection of the first direction to reduce the risk of the support member interfering with the pressure relief portion, resulting in reduced pressure relief efficiency of the battery.

[0014] In some embodiments, the pressure relief portion includes a pressure relief hole and / or a weak structure.

[0015] In the scheme of the embodiment of the present application, the pressure relief portion includes a pressure relief hole to increase the pressure relief rate of the battery, and / or the pressure relief portion includes a weak structure. When the weak structure is in operation, the battery discharge can quickly enter the exhaust chamber through the pressure relief portion, and the weak structure can improve the integrity of the electrical chamber when it is not in operation.

[0016] In some embodiments, the support member includes a second through hole extending along the second direction or the third direction, and a plane formed by the second direction and the third direction is perpendicular to the first direction.

[0017] In the solution of the embodiment of the present application, the support member includes a second through hole that runs through the second direction or the third direction, which can reduce the weight of the support member and save the material cost of the support member, and facilitate the passage of gas through the support member to quickly equalize the gas pressure in the exhaust chamber, thereby improving the exhaust chamber's ability to accommodate battery exhaust.

[0018] In some embodiments, there are multiple support members, and the multiple support members are arranged at intervals.

[0019] In the solution of the embodiment of the present application, multiple support members are arranged at intervals to reduce the interference of the support members on the gas in the exhaust chamber, facilitate rapid equalization of the gas pressure in the exhaust chamber, and reduce the risk of exhaust overflowing into the electrical chamber due to excessive pressure inside the exhaust chamber.

[0020] In some embodiments, a plurality of pressure relief holes are arranged in an array along the second direction and / or the third direction on the partition, the first direction, the second direction and the third direction intersect each other, and the support member is disposed between adjacent pressure relief holes in the second direction or the third direction.

[0021] In the scheme of the embodiment of the present application, a plurality of pressure relief holes are arranged in an array along the second direction and / or the third direction on the partition, and a support member is disposed between adjacent pressure relief holes in the second direction or the third direction. The pressure relief holes of the out-of-control battery cells and the pressure relief holes of the normal battery cells are separated by the support member to reduce the influence of the out-of-control battery cells on the normal battery cells.

[0022] In some embodiments, the box body further includes a connecting plate, and at least two support members are connected via the connecting plate.

[0023] In the solution of the embodiment of the present application, the box body also includes a connecting plate, and at least two support members are connected by the connecting plate. The connecting plate integrates and supports the support members to facilitate the installation and removal of the support members.

[0024] In some embodiments, the battery further includes a side plate connected to the bottom plate, and the support member is connected to at least one of the bottom plate, the partition plate, and the side plate.

[0025] In the solution of the embodiment of the present application, the battery also includes a side plate, which is connected to the bottom plate. By connecting the support member to at least one of the bottom plate, the partition and the side plate, the support member can enhance the structural strength of the box body and / or the partition.

[0026] In the second aspect, an embodiment of the present application provides a battery, including a battery cell and a battery case of the first aspect embodiment, the battery cell is arranged in an electrical cavity, the partition is provided with a pressure relief portion, and the pressure relief structure of the battery cell and the pressure relief portion are relatively arranged along the thickness direction of the partition.

[0027] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery as in the embodiment of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0029] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;

[0030] Figure 2 An exploded schematic diagram of a battery provided in one embodiment of the present application;

[0031] Figure 3 A schematic diagram of the structure of a battery module in a battery provided in an embodiment of the present application;

[0032] Figure 4 A cross-sectional view of a battery provided in an embodiment of the present application;

[0033] Figure 5 A cross-sectional view of a battery provided in another embodiment of the present application;

[0034] Figure 6 A schematic diagram of the structure of the support member of the battery box provided in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of a portion of the structure of a battery box provided in an embodiment of the present application;

[0036] Figure 8 A schematic diagram of a portion of the structure of a battery box provided in an embodiment of the present application;

[0037] Fig. 9 A schematic diagram of a portion of the structure of a battery box provided in an embodiment of the present application;

[0038] Fig.10 A schematic diagram of the partial structure of the battery case provided in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 1. Vehicle; 2. Battery; 101. Motor; 102. Controller; 201. Battery module; 3. Battery cell; 4. Battery case; 41. Case body; 411. First case; 412. Second case; 413. Electrical chamber; 414. Exhaust chamber; 415. Bottom plate; 417. Chamber;

[0041] 42. partition; 421. pressure relief part;

[0042] 43. Support member; 431. Avoidance portion; 432. Second through hole; 434. Air vent;

[0043] 44. Connecting plate. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0045] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0046] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0047] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0050] In the present application, the battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells, etc., and the embodiments of the present application are not limited to this.

[0051] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0052] Lithium-ion power batteries have the properties of high operating voltage, high specific energy, small size, light weight, long cycle life, low self-discharge rate, no memory effect, and no pollution, so they are used by many power equipment manufacturers. With the vigorous development of lithium batteries, battery safety issues have also received widespread attention. In lithium battery systems, partitions can be used to separate the battery box into an electrical cavity and a storage cavity for accommodating battery cells. When a battery cell thermally runs away, high-temperature ejecta will enter the storage cavity through several pressure reliefs, reducing the impact of high-temperature ejecta on other battery cells and other functional components in the electrical cavity. However, in some batteries, when a battery cell thermally runs away, the high-temperature ejecta cannot be completely contained in the exhaust cavity.

[0053] The above problems are caused by the fact that when the battery cell thermally runs away, the shell of the battery cell deforms and severely squeezes the partition; or the high-temperature ejected material impacts the partition, causing the partition to deform, resulting in insufficient storage space in the storage cavity, and the high-temperature ejected material spreads to the electrical cavity and damages other battery cells.

[0054] Based on the above problems, the present application provides a battery case, which includes a case body, a partition and a support member. The case body includes a bottom plate and a chamber located on the bottom plate. The partition is located in the chamber and is arranged on the bottom plate at intervals along a first direction to divide the chamber into an electrical chamber and an exhaust chamber. The electrical chamber is located on the side of the partition away from the bottom plate, and the electrical chamber is used to accommodate battery cells. The exhaust chamber is located on the side of the partition facing the bottom plate, and the exhaust chamber is used to collect emissions from the battery cells. A support member is arranged in the exhaust chamber. The support member is supported on the bottom plate and / or the partition along the first direction to improve the deformation resistance of the partition, so as to improve the problem that when the battery thermal runaway occurs, the partition bends and deforms under pressure to reduce the volume of the exhaust chamber, so that some high-temperature ejecta do not enter the exhaust chamber, and other battery cells are damaged, thereby improving the reliability of the battery case.

[0055] The technical solution described in the embodiments of the present application is applicable to electrical devices using batteries.

[0056] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0057] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including a box and electrical equipment using the battery. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0058] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided for some embodiments of the present application. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 2 is provided inside the vehicle 1, and the battery may be provided at the bottom, head or tail of the vehicle 1. Battery 2 may be used to power the vehicle 1, for example, battery 2 may be used as an operating power source for the vehicle 1. Vehicle 1 may also include a controller 102 and a motor 101, and the controller 102 is used to control the battery to power the motor 101, for example, for starting, navigating and operating power requirements of the vehicle 1 during driving.

[0059] In some embodiments of the present application, the battery can be used not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0060] In order to meet different power requirements, the battery 2 may include a plurality of battery cells, and a battery cell refers to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells can be connected in series and / or in parallel via electrode terminals for use in various applications. The battery 2 mentioned in the present application includes a battery module or a battery pack. Among them, a plurality of battery cells can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series and parallel connection. In the embodiments of the present application, a plurality of battery cells can directly constitute a battery pack, or they can first constitute a battery module, and then the battery module constitutes a battery pack.

[0061] Figure 2 A schematic structural diagram of a battery 2 according to an embodiment of the present application is shown.

[0062] like Figure 2 As shown, the battery includes a battery case (not shown) and a battery cell (not shown), and the battery cell is accommodated in a case body 41 of the battery case.

[0063] The box body 41 can be a simple three-dimensional structure such as a single cuboid, a cylinder or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The box body 41 can be made of alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam plastic, or composite materials such as glass fiber and epoxy resin.

[0064] The box body 41 is used to accommodate battery cells, and the box body 41 can be a variety of structures. In some embodiments, the box body 41 can include a second box body 412 and a first box body 411, and the second box body 412 and the first box body 411 cover each other, and the second box body 412 and the first box body 411 jointly define a storage space for accommodating the battery cell 3. The first box body 411 can be a hollow structure with one end open, and the second box body 412 is a plate-like structure. The second box body 412 covers the open side of the first box body 411 to form a box body 41 with a storage space; the second box body 412 and the first box body 411 can also be a hollow structure with one side open, and the open side of the second box body 412 covers the open side of the first box body 411 to form a box body 41 with a storage space. Of course, the second box body 412 and the first box body 411 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0065] In order to improve the sealing performance after the second box body 412 is connected to the first box body 411 , a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the second box body 412 and the first box body 411 .

[0066] Assuming that the second box body 412 covers the top of the first box body 411 , the second box body 412 can also be referred to as an upper box cover, and the first box body 411 can also be referred to as a lower box cover.

[0067] In the battery 2, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells are both connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells can be accommodated in the box body 41; of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module 201, and the multiple battery modules 201 can be connected in series, in parallel, or in mixed connection to form a whole, and then accommodated in the box body 41.

[0068] Figure 3 A schematic structural diagram of a battery module 201 according to an embodiment of the present application is shown.

[0069] In some embodiments, Figure 2 and Figure 3 As shown, there are multiple battery cells 3, and the multiple battery cells 3 are first connected in series, parallel or mixed to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel or mixed to form a whole, and are accommodated in the battery box 4.

[0070] The multiple battery cells 3 in the battery module 201 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 3 in the battery module 201 .

[0071] In the present application, the battery cell 3 may include a lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the present embodiment is not limited thereto. The battery cell 3 is cylindrical in shape. The following embodiments are all described by taking a cylindrical battery cell as an example.

[0072] See also Figure 4 , Figure 4 A cross-sectional view of a battery provided in an embodiment of the present application.

[0073] First, as Figure 4As shown, the present application provides a battery box 4, which includes a box body 41, a partition 42 and a support member 43. The box body 41 includes a bottom plate 415 and a chamber 417 located on the bottom plate 415; the partition 42 is located in the chamber 417 and is arranged on the bottom plate 415 at intervals along a first direction X to divide the chamber 417 into an electrical chamber 413 and an exhaust chamber 414. The electrical chamber 413 is located on a side of the partition 42 away from the bottom plate 415. The electrical chamber 413 is used to accommodate a battery cell 3, and the exhaust chamber 414 is used to collect emissions from the battery cell 3; the support member 43 is located in the exhaust chamber 414, and the support member 43 is supported on the bottom plate 415 and / or the partition 42 along the first direction X.

[0074] In the scheme of the embodiment of the present application, the battery box 4 includes a box body 41, a partition 42 and a support member 43, the box body 41 includes a bottom plate 415 and a chamber 417 located on the bottom plate 415, the partition 42 is located in the chamber 417 and is arranged on the bottom plate 415 at intervals along the first direction X to divide the chamber 417 into an electrical chamber 413 and an exhaust chamber 414, the electrical chamber 413 is located on the side of the partition 42 away from the bottom plate 415, the electrical chamber 413 is used to accommodate the battery cell 3, and the exhaust chamber 414 is located on the side of the partition 42 facing the bottom plate 415. On one side of the bottom plate 415, the exhaust cavity 414 is used to collect emissions from the battery cells 3. A support member 43 is arranged in the exhaust cavity 414. The support member 43 is supported on the bottom plate 415 and / or the partition 42 along the first direction X to improve the deformation resistance of the partition 42. This improves the problem that when the battery 2 is thermally out of control, the partition 42 bends and deforms under pressure, thereby reducing the volume of the exhaust cavity, so that part of the high-temperature ejecta does not enter the exhaust cavity, causing other battery cells 3 to be damaged. This improves the reliability of the battery box 4.

[0075] The battery cell 3 is provided with a pressure relief mechanism so that the internal pressure and substances can be released to the outside through the pressure relief mechanism when the battery cell 3 is in thermal runaway. The bottom plate 415 does not specifically refer to the wall plate arranged on the gravity side of the battery box 4. After the battery cell 3 is placed in the box body 41, the bottom plate 415 is a wall plate arranged opposite to the pressure relief mechanism of the battery cell 3.

[0076] Optionally, the box body 41 further includes a top plate and side plates. The top plate and the bottom plate 415 are arranged opposite to each other, and the side plates are connected to the top plate and the bottom plate 415 . The top plate, the bottom plate 415 and the side plates enclose a chamber 417 .

[0077] The partition 42 is disposed in the chamber 417, and the partition 42 and the bottom plate 415 are spaced apart along the first direction X. The partition 42 divides the chamber 417 into an electrical chamber 413 and an exhaust chamber 414 along the first direction X. The specific shapes and volumes of the electrical chamber 413 and the exhaust chamber 414 can be flexibly designed. The electrical chamber 413 is used to accommodate the battery cell 3. When the battery cell 3 is in thermal runaway, the substances inside the battery cell 3 enter the exhaust chamber 414 through the pressure relief mechanism and the partition 42.

[0078] A support member 43 is also provided in the exhaust cavity 414, and the support member 43 is supported on the bottom plate 415 and / or the partition 42 along the first direction X. The support member 43 is used to provide support for the partition 42 when the battery cell 3 thermally runs away, causing the partition 42 to bend toward the exhaust cavity 414, so as to reduce the risk of the exhaust height of the exhaust cavity 414 being reduced due to the bending of the partition 42 toward the exhaust cavity 414, and the exhaust of the battery cell 3 overflowing into the electrical cavity 413.

[0079] Specifically, the support member 43 includes a first end and a second end that are arranged opposite to each other along the first direction X. The first end of the support member 43 is connected to the bottom plate 415, and the second end extends toward the partition 42 along the first direction X, so that when the partition 42 bends toward the exhaust chamber 414, the support member 43 can provide support for the partition 42 through the second end. Optionally, the second end abuts against the partition 42 to improve the supporting effect of the support member 43 on the partition 42. Alternatively, the first end of the support member 43 is connected to the partition 42, and the second end extends toward the bottom plate 415 along the first direction X, so that when the partition 42 bends toward the exhaust chamber 414, the bottom plate 415 supports the partition 42 through the support member 43. Optionally, the second end abuts against the bottom plate 415 to improve the supporting effect of the support member 43 on the partition 42. Alternatively, the first end of the support member 43 is connected to the bottom plate 415, and the second end of the support member 43 is connected to the partition 42 to improve the supporting effect of the support member 43 on the partition 42.

[0080] Optionally, the partition plate 42 and / or the bottom plate 415 and the support member 43 may be connected by welding, bonding, clamping, bolting, riveting, etc.

[0081] Optionally, a plurality of support members 43 are disposed in the exhaust cavity 414 to enhance the supporting effect of the support members 43 on the partition 42 .

[0082] Optionally, the shape of the support member 43 can be flexibly designed. Exemplarily, the support member 43 is in a cubic shape.

[0083] In some embodiments, Figure 4 As shown, the partition plate 42 is provided with a pressure relief portion 421 , and the support member 43 has an avoidance portion 431 , and the avoidance portion 431 is arranged along the first direction X opposite to the pressure relief portion 421 .

[0084] In these embodiments, the partition 42 is provided with a pressure relief portion 421, and the pressure relief portion 421 is used to correspond to the pressure relief structure of the battery cell 3. The avoidance portion 431 is arranged relative to the pressure relief portion 421 along the first direction X, so that the discharge of the battery 2 can enter the exhaust chamber 414 through the pressure relief portion 421 and the avoidance portion 431. Therefore, the avoidance portion 431 of the support member 43 is arranged relative to the pressure relief portion 421 along the first direction X. When the pressure relief portion 421 is not operating, the support member 43 improves the deformation resistance of the partition 42 near the pressure relief portion 421, and when the pressure relief portion 421 is operating, the discharge can quickly enter the exhaust chamber 414 through the avoidance portion 431, thereby improving the reliability of the battery box 4.

[0085] The partition plate 42 is provided with a pressure relief portion 421 . After the battery cell 3 experiences heat loss, the exhaust of the battery cell 3 enters the exhaust chamber 414 through the pressure relief portion 421 .

[0086] The area of ​​the partition 42 where the pressure relief portion 421 is set has a lower structural strength than other areas, so that when the battery cell 3 is working normally or in thermal runaway, the pressure relief portion 421 is more likely to bend under pressure. Therefore, the support member 43 and the pressure relief portion 421 area are arranged to face each other, so that the support member 43 can provide a better support effect for the partition 42 and reduce the probability of the partition 42 bending and deforming in the pressure relief portion 421 area; at the same time, in order to reduce the interference of the support member 43 with the pressure relief process of the pressure relief portion 421, an avoidance portion 431 is arranged at the position corresponding to the support member 43 and the pressure relief portion 421, so that the exhaust can smoothly pass through the avoidance portion 431 into the exhaust chamber 414.

[0087] Optionally, the support member 43 includes a supporting portion and an avoiding portion 431 connected to each other, the avoiding portion 431 and the pressure relief portion 421 are arranged opposite to each other in the first direction X, and the supporting portion is used to provide support to the partition 42 when the battery cell 3 is working normally and the pressure relief portion 421 is operating.

[0088] In other embodiments, Figure 4 As shown, the avoidance portion 431 is a first through hole, one end of the first through hole is arranged toward the pressure relief portion 421, and / or the avoidance portion 431 is a meltable channel.

[0089] In these embodiments, the avoidance portion 431 is a first through hole, so that the discharge of the battery 2 enters the exhaust chamber 414 through the first through hole via the pressure relief portion 421, thereby increasing the pressure relief speed and improving the reliability of the battery case 4, and / or the avoidance portion 431 is a fusible channel, so that the discharge of the battery 2 enters the exhaust chamber 414 through the pressure relief portion 421 to melt the avoidance portion 431, so that when the avoidance portion 431 is not melted, the support portion provides a better support effect for the partition 42.

[0090] The avoidance portion 431 is a first through hole, one end of which is arranged toward the pressure relief portion 421, and the other end of the first through hole is arranged on the side surface of the support member 43, so that the discharge of the battery cell 3 is released to the exhaust cavity 414 through the pressure relief portion 421 and the through hole. The shape of the first through hole can be flexibly set, and illustratively, the through hole is a circular hole. Optionally, the support member 43 is made of flame-retardant and high-temperature resistant material to improve the support effect of the support member 43 on the partition 42.

[0091] Alternatively, the avoidance portion 431 is a fusible channel, and the melting temperature of the material of the avoidance portion 431 is lower than the temperature of the discharge. When the battery cell 3 is in thermal runaway, the high-temperature discharge passes through the pressure relief portion 421, which causes the avoidance portion 431 to melt, thereby connecting the pressure relief portion 421 and the exhaust chamber 414. Exemplary materials of the fusible channel are PP (Polypropylene), PS (Polystyrene), PVC (Polyvinyl chloride), PA (Polyamide), etc.

[0092] Alternatively, the support member 43 includes a high temperature resistant support portion and an escape portion 431, and the escape portion 431 includes a through hole and a fusible material filled in the through hole, so that the high temperature exhaust melts the fusible material and enters the exhaust cavity 414 through the through hole. The through hole is used to reasonably plan the pressure relief channel of the exhaust, so that the support member 43 provides a good support effect on the partition 42 when the battery 2 is thermally runaway, and the exhaust is quickly released into the exhaust cavity 414 through the through hole.

[0093] See also Figure 5 , Figure 5 A cross-sectional view of a battery provided according to another embodiment of the present application.

[0094] In some embodiments, Figure 5 As shown, the partition 42 is provided with a pressure relief portion 421 , and along the first direction X, the support member 43 and the pressure relief portion 421 are projected and staggered.

[0095] In these embodiments, the partition 42 is provided with a pressure relief portion 421 so that the exhaust of the battery cell 3 can enter the exhaust chamber 414 through the pressure relief portion 421, and the support member 43 and the pressure relief portion 421 are staggered along the projection of the first direction X to reduce the risk of the support member 43 interfering with the pressure relief portion 421, resulting in a decrease in the pressure relief efficiency of the battery 2.

[0096] Optionally, the support member 43 and the pressure relief portion 421 are staggered, and the support member 43 will not be melted by the high-temperature exhaust released into the exhaust chamber 414 , so as to ensure the supporting effect of the support member 43 on the partition 42 .

[0097] In some embodiments, Figure 5As shown, the pressure relief portion 421 includes a pressure relief hole and / or a weak structure.

[0098] In these embodiments, the pressure relief portion 421 includes a pressure relief hole to increase the pressure relief rate of the battery 2, and / or the pressure relief portion 421 includes a weak structure, when the weak structure is in operation, the discharge from the battery 2 can quickly enter the exhaust chamber 414 through the pressure relief portion 421, and the weak structure can improve the integrity of the electrical chamber 413 when it is not in operation.

[0099] The pressure relief portion 421 is a pressure relief hole. The pressure relief mechanism of the battery cell 3 and the pressure relief hole are correspondingly arranged so that when the battery 2 is in thermal runaway, the exhaust enters the exhaust chamber 414 through the pressure relief hole. The pressure relief portion 421 in the form of a through hole can accelerate the pressure relief speed of the battery 2.

[0100] The pressure relief portion 421 is a weak structure. Specifically, a pressure relief area corresponding to the pressure relief structure of the battery cell 3 is provided on the partition 42. The weak structure means that the thickness of the partition 42 in the pressure relief area is less than the thickness of the partition 42 in other areas, or a weakened groove is opened in the pressure relief area, or a through hole is opened in the pressure relief area. The weak structure is a cover plate welded or bonded to the through hole, so that when the battery cell 3 thermally runs away, the exhaust can break through the weak structure and enter the exhaust chamber 414.

[0101] See also Figure 6 , Figure 6 A schematic diagram of the structure of the support member of the battery box provided in an embodiment of the present application.

[0102] In some embodiments, Figure 5 and Figure 6 As shown, the support member 43 includes a second through hole 432 that penetrates along the second direction Y or the third direction Z, and the plane formed by the second direction Y and the third direction Z is perpendicular to the first direction X.

[0103] In these embodiments, the support member 43 includes a second through hole 432 that passes through along the second direction Y or the third direction Z, which can reduce the weight of the support member 43 and save the material cost of the support member 43, and facilitate the passage of gas through the support member 43 to quickly balance the gas pressure in the exhaust chamber 414, thereby improving the exhaust chamber 414's ability to contain the exhaust from the battery 2.

[0104] The support member 43 extends along the second direction Y, and a second through hole 432 is provided on the support member 43 along the third direction Z, and / or the support member 43 extends along the third direction Z, and a second through hole 432 is provided on the support member 43 along the second direction Y. Through the second through hole 432 on the support member 43, after the exhaust enters the exhaust cavity 414, it can diffuse to the surrounding area through the second through hole 432, thereby reducing the interference of the support member 43 with the exhaust.

[0105] Optionally, the shape of the second through hole 432 can be flexibly designed, and the exemplary second through hole 432 is rectangular or circular. The shapes and sizes of the second through holes 432 located in one support member 43 can be the same or different.

[0106] Optionally, the extension direction and length of each support member 43 are the same, and the second through holes 432 on each support member 43 are evenly arranged, so that the support member 43 is subjected to uniform force at all locations, thereby increasing the service life of the support member 43 .

[0107] See also Figure 7 and Figure 8 , Figure 7 A schematic diagram of a portion of the structure of a battery box provided in an embodiment of the present application; Figure 8 A schematic diagram of the partial structure of the battery case provided in an embodiment of the present application.

[0108] In some embodiments, Figure 5 , Figure 7 and Figure 8 As shown, there are a plurality of support members 43 , and the plurality of support members 43 are arranged at intervals.

[0109] In these embodiments, multiple support members 43 are arranged at intervals to reduce the interference effect of the support members 43 on the gas in the exhaust chamber 414, facilitate rapid equalization of the gas pressure in the exhaust chamber 414, and reduce the risk of exhaust overflowing into the electrical chamber 413 due to excessive pressure inside the exhaust chamber 414.

[0110] Optionally, the shape of the support member 43 can be flexibly designed. Exemplarily, the support member 43 is in a columnar or cubic shape.

[0111] Optionally, the support members 43 are arranged at equal intervals so that the discharge can be evenly diffused through the gaps between the support members 43 .

[0112] See also Fig. 9 and Fig.10 , Fig. 9 A schematic diagram of a portion of the structure of a battery box provided in an embodiment of the present application; Fig.10 A schematic diagram of the partial structure of the battery case provided in an embodiment of the present application.

[0113] In some embodiments, Figure 5 , Fig. 9 and Fig.10 As shown, a plurality of pressure relief holes are arranged in an array along the second direction Y and / or the third direction Z on the partition 42, the first direction X, the second direction Y and the third direction Z intersect each other, and the support member 43 is arranged between adjacent pressure relief holes in the second direction Y or the third direction Z.

[0114] In these embodiments, a plurality of pressure relief holes are arranged in an array along the second direction Y and / or the third direction Z on the partition 42, and the support member 43 is disposed between adjacent pressure relief holes in the second direction Y or the third direction Z. The pressure relief holes of the out-of-control battery cells 3 and the pressure relief holes of the normal battery cells 3 are separated by the support member 43 to reduce the influence of the out-of-control battery cells 3 on the normal battery cells 3.

[0115] The pressure relief hole in this embodiment is the pressure relief portion 421 in the above embodiment.

[0116] A plurality of pressure relief holes are arranged in an array along the second direction Y and / or the third direction Z on the partition 42, and each pressure relief hole is correspondingly arranged to the pressure relief mechanism of the battery cell 3, so that when the battery cell 3 thermally runs away, the exhaust of the battery cell 3 enters the exhaust chamber 414 through the pressure relief hole.

[0117] The support member 43 is arranged between adjacent pressure relief holes so that when some of the battery cells 3 are in thermal runaway, the support member 43 can separate the discharge of the faulty battery cells 3 from the normal battery cells 3, thereby reducing the risk of damage to the normal battery 2 and causing the thermal runaway inside the battery 2 to spread and intensify.

[0118] Optionally, the pressure relief holes are arranged at intervals along the second direction Y and the third direction Z, and the support member 43 is arranged between adjacent pressure relief holes in the second direction Y or the third direction Z, so that after the exhaust enters the exhaust chamber 414, the support member 43 blocks the exhaust from affecting the normal battery 2 in one of the second direction Y or the third direction Z, and the exhaust diffuses in the exhaust chamber 414 along the other of the second direction Y or the third direction Z.

[0119] Optional, such as Fig.10 As shown, the pressure relief holes are arranged at intervals along the second direction Y or the third direction Z, and the support members 43 are arranged between adjacent pressure relief holes along the second direction Y or the third direction Z, wherein air holes 434 are provided on the support members 43 arranged in the second direction Y or the third direction Z, so that the pressure in the exhaust chamber 414 can diffuse to other areas through the air holes 434.

[0120] In some embodiments, Figure 5 and Fig. 9 As shown, the box body 41 further includes a connecting plate 44 , and at least two supporting members 43 are connected via the connecting plate 44 .

[0121] In these embodiments, the box body 41 further includes a connecting plate 44 , and at least two support members 43 are connected via the connecting plate 44 . The connecting plate 44 integrates and supports the support members 43 to facilitate installation and removal of the support members 43 .

[0122] At least two support members 43 are connected to the connecting plate 44, and the connecting plate 44 is connected to the bottom plate 415, so that the support member 43 is connected to the box body 41 through the connecting plate 44, and the projection of the support member 43 in the first direction X is located inside the connecting plate 44, and the connecting plate 44 is used to improve the connection reliability between the support member 43 and the bottom plate 415.

[0123] Through the integration of the support member 43, the assembly steps of the support member 43 and the box body 41 are simplified, and the assembly time is reduced.

[0124] In some embodiments, Figure 5 As shown, the battery 2 further includes a side plate, which is connected to the bottom plate 415 , and the support member 43 is connected to at least one of the bottom plate 415 , the partition plate 42 , and the side plate.

[0125] In these embodiments, the battery 2 also includes a side plate connected to the bottom plate 415. By connecting the support member 43 to at least one of the bottom plate 415, the partition 42, and the side plate, the support member 43 serves to enhance the structural strength of the box body 41 and / or the partition 42.

[0126] The support member 43 may also be connected to the bottom plate 415 or the side plate, so that the support member 43 can support the bottom plate 415 or the side plate, thereby reducing the risk of deformation of the bottom plate 415 or the side plate under the action of external force.

[0127] Specifically, the support member 43 extends in the exhaust cavity 414 , and the support member 43 is connected to the bottom plate 415 , the side plate and the partition plate 42 .

[0128] In the second aspect, an embodiment of the present application provides a battery, including a battery cell and a battery case of the first aspect embodiment, the battery cell is arranged in an electrical cavity, the partition is provided with a pressure relief portion, and the pressure relief structure of the battery cell and the pressure relief portion are relatively arranged along the thickness direction of the partition.

[0129] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery as in the embodiment of the second aspect.

[0130] In some embodiments, Figures 1 to 10As shown, the present application provides a battery box 4, the battery box 4 includes a box body 41, a partition 42, a support member 43 and a connecting plate 44, the box body 41 includes a bottom plate 415 and a chamber 417 located on the bottom plate 415; the partition 42 is located in the chamber 417 and is arranged on the bottom plate 415 at intervals along a first direction X to divide the chamber 417 into an electrical chamber 413 and an exhaust chamber 414, the electrical chamber 413 is located on the side of the partition 42 away from the bottom plate 415, the electrical chamber 413 is used to accommodate a battery cell 3, and the exhaust chamber 414 is used to collect emissions from the battery cell 3; the support member 43 is located in the exhaust chamber 414, a plurality of support members 43 are arranged at intervals, and the support member 43 supports the exhaust chamber 414 along the first direction X. Supported on the bottom plate 415 and / or the partition 42, the partition 42 is provided with a pressure relief portion 421, the pressure relief portion 421 includes a pressure relief hole, along the first direction X, the support member 43 and the pressure relief portion 421 projection are staggered, the support member 43 includes a through hole passing through along the second direction Y or the third direction Z, the plane formed by the second direction Y and the third direction Z is perpendicular to the first direction X, or, the partition 42 is provided with a plurality of pressure relief holes arranged in an array along the second direction Y and / or the third direction Z, the first direction X, the second direction Y and the third direction Z intersect each other, the support member 43 is arranged between adjacent pressure relief holes in the second direction Y or the third direction Z, and at least two support members 43 are connected by a connecting plate 44.

[0131] In the scheme of the embodiment of the present application, the battery box 4 includes a box body 41, a partition 42 and a support member 43, the box body 41 includes a bottom plate 415 and a chamber 417 located on the bottom plate 415, the partition 42 is located in the chamber 417 and is arranged on the bottom plate 415 at intervals along the first direction X to divide the chamber 417 into an electrical chamber 413 and an exhaust chamber 414, the electrical chamber 413 is located on the side of the partition 42 away from the bottom plate 415, the electrical chamber 413 is used to accommodate the battery cell 3, and the exhaust chamber 414 is located on the side of the partition 42 facing the bottom plate 415. On one side of the bottom plate 415, the exhaust cavity 414 is used to collect emissions from the battery cells 3. A support member 43 is arranged in the exhaust cavity 414. The support member 43 is supported on the bottom plate 415 and / or the partition 42 along the first direction X to improve the deformation resistance of the partition 42. This improves the problem that when the battery 2 is thermally out of control, the partition 42 bends and deforms under pressure, thereby reducing the volume of the exhaust cavity, so that part of the high-temperature ejecta does not enter the exhaust cavity, causing other battery cells 3 to be damaged. This improves the reliability of the battery box 4.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery box, characterized in that: include: A box body, comprising a bottom plate and a chamber located on the bottom plate; a partition, the partition being located in the chamber and spaced apart from the bottom plate along a first direction to divide the chamber into an electrical chamber and an exhaust chamber, the electrical chamber being located on a side of the partition away from the bottom plate, the electrical chamber being used to accommodate a battery cell, and the exhaust chamber being used to collect exhaust from the battery cell; A support member is located in the exhaust cavity, and the support member is supported on the bottom plate and / or the partition along the first direction.

2. The battery box according to claim 1, characterized in that: The partition is provided with a pressure relief portion, and the support member has an escape portion, and the escape portion and the pressure relief portion are arranged opposite to each other along the first direction.

3. The battery box according to claim 2, characterized in that: The avoidance portion is a first through hole, one end of the through hole is arranged toward the pressure relief portion, and / or the avoidance portion is a meltable channel.

4. The battery box according to claim 1, characterized in that: The partition is provided with a pressure relief portion, and along the first direction, the support member and the pressure relief portion are projected and staggered.

5. The battery case according to any one of claims 2 to 4, characterized in that: The pressure relief portion includes a pressure relief hole and / or a weak structure.

6. The battery box according to claim 1, characterized in that: The support member includes a second through hole penetrating along a second direction or a third direction, and a plane formed by the second direction and the third direction is perpendicular to the first direction.

7. The battery box according to claim 1, characterized in that: There are a plurality of support members, and the plurality of support members are arranged at intervals.

8. The battery case according to claim 7, characterized in that: The partition plate has a plurality of pressure relief holes arranged in an array along the second direction and / or the third direction, and the first direction, the second direction and the third direction intersect each other. The support member is disposed between the pressure relief holes that are adjacent to each other in the second direction or the third direction.

9. The battery case according to claim 8, characterized in that: The box body further comprises a connecting plate, and at least two of the supporting members are connected via the connecting plate.

10. The battery box according to claim 1, characterized in that: The battery further includes a side plate connected to the bottom plate, and the support member is connected to at least one of the bottom plate, the partition plate, and the side plate.

11. A battery, characterized in that: It comprises a battery cell and a battery case as claimed in any one of claims 1 to 10, wherein the battery cell is arranged in the electrical cavity, the partition is provided with a pressure relief portion, and the pressure relief structure of the battery cell and the pressure relief portion are arranged relatively to each other along the thickness direction of the partition.

12. An electrical device, characterized in that: The battery comprising the battery as claimed in claim 11 above.

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