A battery box, a battery box plate, and a battery pack

Abstract

This application discloses a battery box panel, a battery box, and a battery pack. The battery box (1) is configured to house a battery (2), and the panel (10) is configured to form at least one side of the battery box (1). The panel (10) includes a panel body (101), at least one cooling structure (102) connected to a first side (1011) of the panel body (101), and at least one support structure (103) connected to a second side (1021) of the cooling structure (102). The second side (1021) is disposed on a side away from the first side (1011) along the Z direction, where the Z direction is the thickness direction of the panel (10). The number of support structures (103) is at least two, and at least two support structures (103) have gaps between them to form airflow channels (104) along the X and / or Y directions, where the X direction is the length direction of the panel (10) and the Y direction is the width direction of the panel (10). This application improves the high-temperature resistance and impact resistance of the panel in the event of thermal runaway.

Description

Technical Field

[0001] This application relates to the field of battery box technology, and in particular to a battery box panel, a battery box, and a battery pack. Background Technology

[0002] In the field of power batteries, high-energy-density cells, such as ternary lithium battery cells, are widely used. However, precisely because of the enormous energy contained in the cells, the internal chemical reactions are exceptionally violent and energy is released rapidly during thermal runaway. This high-energy, high-intensity runaway reaction instantly generates a large amount of high-temperature, high-pressure gas and incompletely combusted substances.

[0003] When thermal runaway occurs inside the battery pack, the high-temperature, high-pressure gases and unburned materials violently impact the battery box. This massive energy impact can easily cause the battery box structure to bulge and deform; in more severe cases, the high temperature carried by the unburned materials is enough to ignite the battery box or surrounding components, and may even burn through the battery box, creating a vent. Once the battery box protection fails, the leakage of flames and high-temperature materials will rapidly trigger a chain reaction of thermal runaway. This chain reaction of thermal runaway is irreversible and may ultimately lead to catastrophic safety accidents such as fires and explosions of the entire battery pack and even the vehicle equipped with it.

[0004] Therefore, given the characteristics of ternary lithium batteries, such as their enormous energy and extremely violent thermal runaway reactions, how to effectively improve the thermal runaway protection capability of the battery pack is a key challenge and a core issue that urgently needs to be addressed to ensure the safety of power battery systems. Utility Model Content

[0005] To address the problems of the prior art, this application provides a battery box panel, a battery box, and a battery pack to solve one or more technical problems existing in the prior art.

[0006] In a first aspect, this application provides a battery box panel, the battery box being configured to house a battery, the panel being configured to form at least one side of the battery box; the panel includes a panel body, at least one cooling structure connected to a first side of the panel body for cooling the panel body, and at least one support structure connected to a second side of the cooling structure for supporting the cooling structure; the second side is disposed on a side away from the first side along the Z direction, the Z direction being the thickness direction of the panel; the number of the support structures is at least two, and the at least two support structures have gaps between them, forming airflow channels for airflow in at least one direction of the second side through the gaps.

[0007] In an optional embodiment, the cooling structure includes at least one of a heat insulation plate and a heat spreader plate; The heat insulation board includes a mica board; and / or, the support structure includes support foam; the support structure is bonded to the cooling structure.

[0008] In an optional embodiment, the mica board comprises at least two layers of stacked mica paper.

[0009] In an optional embodiment, the supporting foam is silicone foam.

[0010] In an optional embodiment, the compression ratio of the supporting foam is 20% to 30%.

[0011] In an optional embodiment, a groove is provided on the first surface of the box plate body, and a first position corresponding to the groove is provided on the second surface of the cooling structure. The thickness of the support structure provided at the first position is greater than the thickness of the support structure provided at the second position other than the first position.

[0012] In an optional embodiment, at least two of the support structures are arranged in an array to form an array of gaps, through which airflow channels are formed in two mutually perpendicular directions on the second surface.

[0013] In an optional embodiment, at least a portion of the support structure is provided with dovetail grooves.

[0014] In an alternative embodiment, at least some of the support structures have different dimensions.

[0015] In an optional embodiment, an electrophoretic layer is provided on the first surface of the box panel body and / or an explosion-proof valve is provided on the box panel body and / or the box panel is a box cover.

[0016] A second aspect of this application provides a battery case configured to house a battery, and the battery case includes at least one panel as described in any of the first aspects.

[0017] A third aspect of this application provides a battery pack, the battery pack including a battery box as described in the second aspect and a battery disposed within the battery box, the support structure being disposed on one side of the battery along the Z direction.

[0018] In an optional embodiment, the battery includes at least two cells and at least two pads, each pad being used to electrically connect adjacent cells; the casing body, the cooling structure, the support structure, the pads, and the cells are arranged in sequence; at least one of the support structures is in contact with at least two adjacent pads.

[0019] In an optional embodiment, the battery pack further includes a hollow central beam extending between two opposing side plates of the battery box to separate the different battery cells; at least one of the support structures is disposed on the second surface of the cooling structure at a position corresponding to the end of the central beam to form an airflow barrier between the second surface and the end of the central beam.

[0020] The above-described technical solutions of this application have at least one or more of the following beneficial effects: This application provides a box panel with a three-layer structure arranged sequentially: a box panel body, a cooling structure, and a support structure. On the one hand, the cooling structure isolates or disperses heat, reducing the temperature of the box panel body during thermal runaway of the battery cell and protecting the box panel body. In particular, it reduces the possibility of the flammable box panel body burning due to excessive temperature, thus reducing the risk of heat spread. On the other hand, the support structure provides support to the cooling structure, preventing the cooling structure from falling off under long-term vibration and bumps, and improving the durability and reliability of the cooling structure. Furthermore, the multiple support structures are spaced apart to form airflow channels, promoting the dispersion of airflow generated by thermal runaway to other locations and reducing the occurrence of local pressure concentration.

[0021] Furthermore, this application uses mica plates, heat-dissipating plates, or silicone foam, which are low-cost and readily available materials.

[0022] Furthermore, the support structure is rationally configured and positioned between adjacent panels to avoid inconsistent stress on the support structure due to differences in panel height.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein: Figure 1 This is a schematic diagram of the structure of the box panel provided in Embodiment 1 of this application; Figure 2 This is a schematic diagram of another type of box panel provided in Embodiment 1 of this application. Figure 2 The supporting structure in it is different from Figure 1 Support structure; Figure 3 This is an exploded view of the box panel; Figure 4 This is a cross-sectional diagram of the box panel along its own thickness direction; Figure 5 This is a schematic diagram of the battery box provided in Embodiment 2 of this application; Figure 6 This is an exploded view of the battery pack provided in Embodiment 3 of this application; Figure 7 This is a schematic diagram of the internal structure of the battery pack provided in Embodiment 3 of this application after removing the main body of the casing and some components; Figure 8 yes Figure 7 Enlarged view of point A in the middle circle. Detailed Implementation

[0025] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other. To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] Furthermore, the terms "X direction," "Y direction," and "Z direction" are used only to indicate relative spatial relationships unless otherwise specified, and are not absolute restrictions.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Example 1 Embodiment 1 of this application provides a battery box panel. The battery box 1 is configured to accommodate a battery 2, and the panel 10 is configured to form one or more sides of the battery box 1.

[0034] Please see Figures 1 to 4 The box panel 10 includes a box panel body 101, a cooling structure 102, and a support structure 103.

[0035] The box panel body 101 constitutes the basic structural layer of the box panel 10, and has a first surface 1011. When the box panel 10 forms the battery box 1, the first surface 1011 is configured to face the battery 2 inside the battery box 1.

[0036] In one embodiment, the panel body 101 can be made of metal. To ensure its mechanical properties, cold-rolled steel sheet or steel with equivalent mechanical properties can be selected and formed by stamping. It mainly provides the main structure for the panel 10 and ensures strength and sealing function.

[0037] Further reference Figure 3 , 4 As shown, in one embodiment, a groove 1012 may be provided on the first surface 1011 of the box panel body 101, and a reinforcing rib is formed between adjacent grooves 1012 in order to enhance the rigidity of the box panel 10.

[0038] In one embodiment, an explosion-proof valve (not shown in the figure) may also be provided on the battery box body 101. When the internal pressure of the battery box 1 exceeds a set threshold, the explosion-proof valve can be opened to release pressure and prevent the battery box 1 from bursting.

[0039] To improve corrosion resistance, in one embodiment, at least a portion of the surface of the panel body 101 is subjected to electrophoretic treatment to form an electrophoretic layer. However, the electrophoretic layer is flammable at high temperatures of approximately 500°C, which poses a safety hazard in the event of thermal runaway.

[0040] Considering the insufficient high-temperature resistance or high-temperature flammability of the casing body 101 (as in the aforementioned electrophoretic layer), this application further provides a cooling structure 102. The cooling structure 102 is connected to the first surface 1011 of the casing body 101, and its main function is to insulate and cool the casing body 101. Since the first surface 1011 is configured to face the battery 2 inside the battery box 1, the cooling structure 102 can reduce or slow down the transfer of high temperature from the battery 2 to the casing body 101 to a certain extent. In embodiments where an electrophoretic layer is provided, the cooling structure 102 can reduce the probability of high-temperature combustion of the electrophoretic layer.

[0041] In this embodiment, the cooling structure 102 can be connected and disposed on the first surface 1011 of the box panel body 101 in any feasible manner. As an example, and not a limitation, in this embodiment, the cooling structure 102 can be bonded to the first surface 1011 of the box panel body 101 using a high-temperature resistant adhesive. In alternative embodiments, the cooling structure 102 can also be connected and disposed on the first surface 1011 of the box panel body 101 using a mechanical connection structure such as a snap-fit.

[0042] In this embodiment, the cooling structure 102 can achieve the cooling function through heat insulation. Specifically, the cooling structure 102 can be a heat insulation plate with heat insulation function, so as to reduce the temperature of the box panel body 10 by isolating heat, that is, blocking heat from being transferred from the battery 2 to the box panel body 101.

[0043] In this embodiment, any feasible material or structure can be selected to form the insulation board. As one feasible approach, the insulation board uses mica sheet. Mica sheet possesses excellent high-temperature resistance (typically able to withstand temperatures above 800°C), high insulation, impact resistance, and a certain degree of flexibility. In one embodiment, the mica sheet is formed by impregnating multiple layers of mica paper with silicone rubber and then laminating them together using a hot-pressing process. This multi-layered mica paper structure further enhances the insulation effect and mechanical strength of the insulation board.

[0044] It should be noted that the heat insulation board or heat insulation function mentioned in this application does not require complete heat insulation, as long as it can meet the user's heat insulation needs.

[0045] In an alternative embodiment, the cooling structure 102 can achieve cooling by means of heat equalization. Specifically, the cooling structure 102 can be a heat equalization plate with heat equalization function. It is clear that when the battery experiences thermal runaway, heat may concentrate in a certain area and be concentratedly transferred to a certain area of ​​the casing body 101, causing the heat in this area to concentrate and rise rapidly. To this end, a heat equalization plate can be provided. When the heat from the battery 2 is concentrated and transferred to the heat equalization plate, the heat equalization plate can evenly transfer the heat to various places, thereby reducing the heat concentration and transfer to a certain area of ​​the casing body 101, and thus reducing the risk of rapid local temperature rise in the casing body 101.

[0046] In this embodiment, any feasible material or structure can be selected to form the heat distribution plate. As a feasible approach, a VC (Vapor Chamber) heat distribution plate can be specifically used. The VC heat distribution plate has extremely high thermal conductivity, and heat is rapidly transferred internally through the phase change (evaporation-condensation) of the working fluid. When a high-temperature flame or gas flow generated by thermal runaway is sprayed onto it, the VC heat distribution plate can rapidly and evenly diffuse a large amount of heat from the local hot spot to the entire plate area, achieving efficient temperature uniformity, avoiding heat accumulation, and thus rapidly reducing the local temperature. This further reduces the risk of high temperature rapidly spreading to local areas of the box plate 101.

[0047] The connection force between the cooling structure 102 and the box panel body 101 may decrease due to various possible factors, causing the cooling structure 102 to detach from the box panel body. For example, long-term vibration or prolonged high-temperature environment can reduce the connection force between the cooling structure 102 and the box panel body 101. Alternatively, if the cooling structure 102 itself is a multi-layered structure (such as the aforementioned layered mica paper structure), the cooling structure 102 itself may delaminate and detach due to various possible factors such as long-term vibration or prolonged high-temperature environment. To address this, a support structure 103 is further provided in this embodiment. The support structure 103 is connected and disposed on the second side 1021 of the cooling structure 102 facing away from the box panel body 101. Its main function is to provide support and fixation for the cooling structure 102 towards the box panel body 101, preventing the cooling structure 102 from delaminating or detaching from the box panel body 101 side. The first surface 1011 and the second surface 1021 are surfaces located away from the Z-direction (not shown in the figure), i.e., the thickness direction of the box plate 10. The corresponding second surface 1021 is a surface in the XY direction. (Refer to...) Figure 1 , 2 3. In the specific embodiments of this application, the X direction is the length direction of the box panel 10, and the Y direction is the width direction of the box panel 10.

[0048] In this embodiment, any feasible material or structure can be selected as the support structure 103. As an example, and not a limitation, in one embodiment of this application, the support structure 103 can be made of foam material, i.e., forming support foam as the support structure 103. In a specific embodiment, the support foam can be made of silicone material foamed into silicone foam. Silicone foam has the characteristics of good elasticity, resistance to high and low temperatures, excellent aging performance, and good flame retardancy. It can not only play a supporting role but also work with other structures to cope with the high temperature and high pressure during thermal runaway.

[0049] In this embodiment, the properties of the supporting foam can be selected and set according to specific needs. In one specific embodiment, the compression ratio of the supporting foam is pre-designed and controlled within the range of 20% to 30%. This design ensures that: firstly, when the housing 10 is installed in place, the supporting foam contacts and compresses with the battery 2 inside the battery box 1, providing continuous and stable elastic support to the cooling structure 102; secondly, the rebound force is controlled within a safe range to avoid the housing 10 bulging and deforming due to excessive rebound force, or causing compression damage to the battery 2 inside the battery box 1.

[0050] In this embodiment, the support structure 103 can be connected and disposed on the second surface 1021 of the cooling structure 102 away from the box plate body 101 in any feasible manner. As an example, and not a limitation, in this embodiment, the support structure 103 can be bonded to the second surface 1021 of the cooling structure 102 away from the box plate body 101 using a high-temperature resistant adhesive, pressure-sensitive adhesive, etc.

[0051] This application does not impose any restrictions on the number, arrangement, or size of the support structures 103. In specific embodiments, they can be selected and set according to requirements.

[0052] As an example, and not a limitation, the area of ​​the support structure 103 may be configured to cover half or more of the area of ​​the cooling structure 102 to provide better support. In an alternative embodiment, the area of ​​the support structure 103 may cover only a small portion of the area of ​​the cooling structure 102.

[0053] As an example, and not a limitation, the number of support structures 103 can be one. In alternative embodiments, such as... Figure 1 , 2 As shown in Figure 3, there are at least two support structures 103. Furthermore, at least some of the adjacent support structures 103 are spaced apart to form an airflow channel 104 for airflow. When the high-temperature and high-pressure airflow generated by the battery thermal runaway impacts the casing 10, the airflow channel 104 can diffuse the high-temperature and high-pressure airflow, avoiding the rapid accumulation of pressure in a local area, thereby effectively preventing the casing 10 from bulging and deforming.

[0054] The number of airflow channels 104 can be set as needed. By way of example, and not limitation, the number of airflow channels 104 is at least two. In an alternative embodiment, the number of airflow channels 104 may also be one.

[0055] In this embodiment of the application, all airflow channels 104 may be connected or only some airflow channels 104 may be connected.

[0056] In this embodiment, the extension direction of the airflow channel 104 can be set as needed. By way of example and not limitation, the extension direction of the airflow channel 104 can be set to extend along the X direction within the second surface 1021, or it can be set to extend along the Y direction within the second surface 1021, or it can extend along a direction inclined to the X and Y directions within the second surface 1021.

[0057] In the embodiments of this application, the airflow channel 104 can be a straight airflow channel or an arc-shaped airflow channel, such as an S-shaped airflow channel. This application does not impose specific limitations on this.

[0058] In this embodiment, at least some of the airflow channels 104 extend in the same direction within the second surface 1021. For example, multiple airflow channels 104 each extend in the X direction and are spaced apart from each other in the Y direction. Or, multiple airflow channels 104 each extend in the Y direction and are spaced apart from each other in the X direction.

[0059] In this embodiment, at least a portion of the airflow channel 104 may extend in different directions within the second surface 1021. By way of example and not limitation, at least a portion of the airflow channel 104 extends in mutually perpendicular directions within the second surface 1021. (See reference...) Figure 1 , 2 As shown, at least a portion of the airflow channels 104 extend within the second surface 1021 along mutually perpendicular X and Y directions. In an alternative embodiment, at least a portion of the airflow channels 104 may extend within the second surface 1021 in non-perpendicular directions, such as parallel directions or inclined directions at 45° angles to each other. When the high-pressure airflow generated by battery thermal runaway impacts the casing 10, the airflow channels 104 extending in different directions enable the high-pressure airflow to rapidly diffuse and flow in multiple directions, preventing a rapid accumulation of pressure in a localized area, thereby effectively preventing the casing 10 from bulging and deforming.

[0060] The multiple support structures 103 can be distributed in a suitable manner according to requirements; this application does not impose specific restrictions in this regard. (See reference...) Figure 1 , 2As shown, and by way of example rather than limitation, in one embodiment of this application, at least two of the support structures 103 are arranged in an array to form an array of gaps, through which a crisscrossing network of airflow channels 104 is formed on the second surface 1021. When the high-pressure airflow generated by battery thermal runaway impacts the inner surface of the cover, the network of airflow channels 104 enables the high-pressure airflow to rapidly diffuse and flow in all directions, avoiding a sharp accumulation of pressure in a local area, thereby further effectively preventing the cover plate 10 from bulging and deforming.

[0061] In this embodiment, the shape of the support structure 103 can be set according to requirements, and this application does not impose specific limitations on it. As an example, and not a limitation, at least a portion of the peripheral sidewalls of the support structure 103 are machined with groove structures. This groove design brings two advantages: first, it provides additional buffer space to temporarily accommodate high-temperature, high-pressure gas; second, it generates vortices by changing the airflow direction, consuming airflow kinetic energy and playing a damping and attenuation role. As a specific example of a groove structure, see [reference needed]. Figure 2 As shown, the groove structure is specifically configured as a dovetail groove 1031 formed on the peripheral wall of the support structure 103. More specifically, dovetail grooves 1031 can be formed on all four peripheral walls of the support structure 103 to increase the buffering and damping effect on high-temperature and high-pressure gases in multiple directions.

[0062] In this embodiment, the dimensions of the support structure 103 can be set according to requirements, and this application does not impose specific limitations on this. The dimensions of the support structure 103 may include its thickness, width, and length. In this embodiment, at least some of the support structures 103 have different dimensions. In alternative embodiments, at least some of the support structures 103 have the same dimensions.

[0063] As an example and not a limitation, at least some of the support structures 103 have different thicknesses. In one embodiment, the thickness of the support structure 103 is adapted to the structure of the box panel body 101. Specifically, as Figure 3 , 4As shown, a groove 1012 is provided on the first surface 1011 of the box panel body 101. The second surface 1021 of the cooling structure 102 includes a first position 1022 corresponding to the groove 1012 and a second position 1023 corresponding to the ungrooved area on the first surface 1011. The original thickness of the support structure 103 provided at the first position 1022 is greater than the original thickness of the support structure 103 provided at the second position 1023. This ensures that after installation, the compression ratio of the support structure 103 in all areas is similar, thereby providing uniform support force to all parts of the cooling structure 102. It should be noted that the first position 1022 corresponding to the groove 1012 mentioned above can mean that the projection of the first position 1022 on the first surface 1011 coincides with or approximately coincides with the groove 1012; the second position 1023 corresponding to the ungrooved area can mean that the projection of the second position 1023 on the first surface 1011 coincides with or approximately coincides with the ungrooved area.

[0064] In the above embodiment, the stacked arrangement of the three parts forms a composite protective structure of "box body - cooling structure - support structure". This structure brings significant benefits: First, the cooling structure 102 directly addresses the high temperature generated by the thermal runaway of the battery 2 inside the battery box 1, protecting the box body 101 from high temperature damage; Second, the support structure 103 ensures that the cooling structure 102 is reliably and fixedly connected to the box body 101 throughout the entire product life cycle, preventing it from disintegrating or falling off due to vibration or other factors; Third, the three-layer structure works together to provide a better synergistic solution for dealing with the high temperature and high pressure impact during thermal runaway.

[0065] Example 2 Embodiment 2 of this application provides a battery box configured to house batteries.

[0066] Figure 5 This is a schematic diagram of the battery box provided in Embodiment 2 of this application. Please refer to... Figure 5 The battery box 1 includes at least one box panel 10, and the box panel 10 is the same as or similar to the box panel 10 described in Embodiment 1.

[0067] In this embodiment, the battery box 1 typically includes a lower box body and an upper box cover, with a receiving space formed between the lower box body and the upper box cover for accommodating the battery 2. The upper box cover and the lower box body can be connected by fasteners such as bolts and sealed by a sealing ring. The upper box cover forms the top surface of the box, and the lower box body generally forms the bottom surface and multiple side surfaces of the box.

[0068] In this application embodiment, the box plate 10 can be used to form any one or more surfaces of the battery box 1, such as the top surface and / or the bottom surface and / or the side surface of the box, and this application does not impose specific limitations on this. Considering that the top cover is usually subjected to the most direct and greatest impact during battery thermal runaway, in this application, by way of example rather than limitation, the box plate 10 can be used to form at least the top surface of the battery box 1, in other words, the box plate 10 is the top cover.

[0069] Considering that the surface of the battery box with the explosion-proof valve needs to withstand a large pressure impact in the event of battery thermal runaway, in this embodiment of the application, at least one surface of the battery box 1 is provided with an explosion-proof valve, and the box plate 10 is used to form at least one surface with the explosion-proof valve.

[0070] Because the battery box 1 uses a box plate 10 with excellent thermal runaway protection capabilities, its overall safety, especially its resistance to impact, fire and deformation when dealing with internal battery thermal runaway, is significantly improved.

[0071] Example 3 Embodiment 3 of this application provides a battery pack. Figure 6 This is a schematic diagram of the internal structure of the battery pack after removing the main body of the casing, as provided in Embodiment 3 of this application; Figure 7 This is a schematic diagram of the internal structure of the battery pack provided in Embodiment 3 of this application after removing the main body of the casing and some components; Figure 8 yes Figure 7 Enlarged view of point A in the middle circle.

[0072] See Figures 6 to 8 The battery pack 3 includes a battery box and batteries 2 disposed inside the battery box. The battery box may be the same as or similar to the battery box 1 described in Embodiment 2 above.

[0073] Further reading Figures 6 to 8 The battery 2 includes multiple cells 21 and tabs 22 for electrically connecting adjacent cells 21. When the housing 10 is installed, the support structure 103 is arranged in the Z direction relative to the side of the housing body 101 facing the battery 2.

[0074] In this application, the positions of the various parts of the battery pack 3 can be selected as needed. As an example, and not a limitation, in one embodiment of this application, the box body 101, cooling structure 102, support structure 103, pad 22, and battery 21 are stacked sequentially along the Z direction, i.e., the thickness direction of the box 10 / battery box 1.

[0075] As the component closest to the battery 2 and related structures within the battery pack 3, the arrangement of the support structure 103 should be coordinated with other structures of the battery pack 3 as much as possible. By way of example, and not limitation, the same support structure 103 can be arranged to abut against at least one tab 22, i.e., the support structure 103 can correspond one-to-one with a tab 22 to provide support and isolation for the tab 22. In this embodiment, the support structure 103 abuts against at least two adjacent tabs 22 simultaneously, such as... Figure 6 As shown, this avoids the height difference between adjacent panels 22 caused by the support structure 103 only abutting against a single panel 22, which could lead to unstable support or uneven stress. It also avoids the support structure 103 being too large, making it difficult to install and increasing costs.

[0076] In some embodiments of this application, a central beam 11 is provided inside the battery box 1. The central beam 11 is typically used for structural reinforcement of the battery box 1 and for isolation between the battery cells 21 inside the battery box 1. In this application, the number, size, shape, or position of the central beams 11 can be selected as needed. See also, as an example and not a limitation. Figure 7 , 8 As shown, the central beam 11 extends between the two side plates inside the battery box 1, and the same or approximately the same number of battery cells 21 are arranged on each side of the central beam 11. In this embodiment, at least a portion of the interior of the central beam 11 is a hollow structure, and its end 111 is usually provided with an opening communicating with the hollow structure. This allows airflow to flow into the hollow structure of the central beam 11 through the opening at the end 11. It is clear that once the battery cell 21 experiences thermal runaway, the high-temperature and high-pressure airflow enters the hollow structure of the central beam 11, and the temperature of the battery cell 21 near the central beam 11 will rise sharply and spread uncontrollably to more battery cells 21 along with the hollow structure. For this purpose, see [reference needed]. Figure 7 , 8 In this embodiment, at least one support structure 103 is provided on the second surface 1021 of the cooling structure 102 at a position corresponding to the end 111 of the middle beam 11 to form an airflow barrier 1032. This airflow barrier 1032 effectively fills the gap between the box plate 10, especially the second surface 1021, and the end 111 of the middle beam 11, preventing or reducing the inflow of high-temperature, high-pressure airflow, especially from the second surface 1021, into the hollow structure of the middle beam 11 after thermal runaway of the battery cell 21, thus suppressing the spread of thermal runaway.

[0077] In this embodiment, the shape, size, etc. of the airflow barrier 1032 can be selected and set according to requirements. This is an example, not a limitation; further reference is encouraged. Figure 8 In a specific embodiment of this application, the airflow barrier 1032 may be designed as a long strip.

[0078] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

[0079] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0080] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. The technical solutions provided by this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application; at the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. In summary, the content of this specification should not be construed as a limitation of this application.

Claims

1. A case plate of a battery case, characterized by, The battery box (1) is configured to accommodate a battery (2), and the box plate (10) is configured to form at least one side of the battery box (1); The box panel (10) includes a box panel body (101), at least one cooling structure (102) connected to a first surface (1011) of the box panel body (101) for cooling the box panel body (101), and at least one support structure (103) connected to a second surface (1021) of the cooling structure (102) for supporting the cooling structure (102); the second surface (1021) is disposed on a side away from the first surface (1011) along the Z direction, and the Z direction is the thickness direction of the box panel (10); The number of the support structures (103) is at least two and at least two of the support structures (103) have gaps between them, through which airflow channels (104) are formed in at least one direction of the second surface (1021) for airflow to pass through.

2. A boxboard according to claim 1, characterised in that The cooling structure (102) includes at least one of a heat insulation plate and a heat dissipation plate; The insulation board includes a mica board; and / or, the support structure (103) includes support foam; The support structure (103) is bonded to the cooling structure (102).

3. The box panel according to claim 2, characterized in that, The mica board comprises at least two layers of stacked mica paper; and / or, the supporting foam is silicone foam; and / or, the compression ratio of the supporting foam is 20%~30%.

4. A boxboard according to any one of claims 1 to 3, c h a r a c t e r i s e d in that The first side (1011) of the box plate body (101) is provided with a groove (1012), and the second side (1021) of the cooling structure (102) is provided with a first position (1022) corresponding to the position of the groove (1012). The thickness of the support structure (103) provided at the first position (1022) is greater than the thickness of the support structure (103) provided at the second position (1023) other than the first position (1022).

5. The box panel according to any one of claims 1 to 3, characterized in that, At least two of the support structures (103) are arranged in an array to form an array of gaps, through which airflow channels (104) are formed in two mutually perpendicular directions on the second surface (1021). or, At least part of the support structure (103) is provided with a dovetail groove (1031); or, At least some of the support structures (103) have different dimensions.

6. A boxboard according to any one of claims 1 to 3, c h a r a c t e r i s e d in that An electrophoretic layer is provided on the first surface (1011) of the box panel body (101) and / or an explosion-proof valve is provided on the box panel body (101) and / or the box panel (10) is a box cover.

7. A battery box characterized by The battery box (1) is configured to house the battery (2), and the battery box (1) includes at least one panel (10) as described in any one of claims 1-6.

8. A battery pack, characterized by, The battery pack (3) includes the battery box (1) as described in claim 7 and the battery (2) disposed in the battery box, and the support structure (103) is disposed on one side of the battery (2) along the Z direction.

9. The battery pack according to claim 8, characterized in that, The battery (2) includes at least two cells (21) and at least two tabs (22), each tab (22) being used to electrically connect adjacent cells (21). The box panel body (101), the cooling structure (102), the support structure (103), the battery plate (22), and the battery cell (21) are arranged in sequence; At least one of the support structures (103) is in contact with at least two adjacent plates (22).

10. The battery pack of claim 9, wherein, The battery pack (3) also includes a hollow central beam (11) extending between two opposite side plates of the battery box (1) to separate the different cells (21). At least one of the support structures (103) is disposed on the second surface (1021) of the cooling structure (102) at a position corresponding to the end (111) of the middle beam (11) to form an airflow barrier (1032) between the second surface (1021) and the end (111) of the middle beam (11).

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