Cover plate assembly, battery pack box body, battery pack and electric equipment

Abstract

The invention discloses a cover plate assembly, a battery pack box body, a battery pack and electric equipment.The battery pack box body comprises a main box body, the main box body is provided with a mounting cavity for containing battery cells, the cover plate assembly covers the main box body and is used for sealing the mounting cavity, and the cover plate assembly comprises a base plate and an upper cover plate; the base plate is provided with an air vent communicated with the mounting cavity; the upper cover plate is arranged on the side, away from the main box body, of the base plate, a flow passing channel is defined between the upper cover plate and the base plate, at least one of the base plate and the upper cover plate is provided with an exhaust port, and the ventilation port is communicated with the exhaust port through the flow passing channel. Therefore, the problem of high-pressure arc discharge caused by high-temperature and high-pressure gas can be avoided, the thermal safety is improved, and compared with a compact exhaust space in the battery pack box body, the cover plate assembly can be internally provided with a flow passage with a larger volume, so that the exhaust efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a cover plate assembly, a battery pack box, a battery pack and an electrical device. Background Art

[0002] Safety accidents involving new energy vehicles are primarily caused by thermal runaway of the vehicle's power battery. Under the influence of abnormal operating factors such as heat, overcharging, or short circuits, the battery can experience thermal runaway, leading to a series of uncontrollable reactions. When thermal runaway occurs, the battery pack of an electric vehicle releases large amounts of high-temperature fumes, which can cause a sharp increase in pressure within the battery pack and trigger an explosion, posing a serious threat to the safety of drivers and passengers. In related technologies, the battery pack is equipped with an exhaust duct, which is used to discharge the high-temperature fumes to the outside of the battery pack to reduce temperature and pressure. The exhaust duct is primarily arranged on the battery tray or between adjacent battery modules. This arrangement can easily affect the high-voltage electrical circuit within the battery pack, and the exhaust duct is limited in size, leaving room for improvement. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a cover assembly for a battery pack case, in which a larger flow channel can be arranged to improve exhaust efficiency.

[0004] According to the cover assembly of the battery pack case of an embodiment of the present invention, the battery pack case includes a main case, the main case is provided with a mounting cavity for accommodating battery cells, the cover assembly is covered on the main case and is used to seal the mounting cavity, the cover assembly includes: a substrate, the substrate is provided with a vent connected to the mounting cavity; an upper cover, the upper cover is provided on a side of the substrate away from the main case, a flow channel is defined between the upper cover and the substrate, at least one of the substrate and the upper cover is provided with an exhaust port, and the flow channel connects the vent with the exhaust port.

[0005] According to the cover assembly of the battery pack case in an embodiment of the present invention, the high-temperature and high-pressure gas flowing into the flow channel can be separated from the high-voltage electrical circuit by arranging the flow channel in the cover assembly, thereby avoiding the high-voltage arcing problem caused by the high-temperature and high-pressure gas and improving thermal safety. Moreover, compared with the compact exhaust space inside the battery pack case, a larger flow channel can be arranged in the cover assembly, which is conducive to improving the exhaust efficiency and enhancing the reliability of the cover assembly.

[0006] According to the cover plate assembly of the battery pack case in some embodiments of the present invention, a molding groove is provided on the side of the upper cover plate facing the substrate, and the substrate and the upper cover plate define the flow channel at the molding groove.

[0007] According to the cover assembly of the battery pack case of some embodiments of the present invention, the current flow channel includes a first channel and a second channel, the first channel extends along a first direction, the second channel extends along a second direction and is connected to the first channel, and the first direction and the second direction intersect.

[0008] According to the cover assembly of the battery pack case of some embodiments of the present invention, the first channels and the second channels are multiple and spaced apart in parallel, and the multiple first channels and the multiple second channels are staggered.

[0009] According to the cover assembly of the battery pack case in some embodiments of the present invention, the exhaust port is located on one side of the upper cover along the first direction, and the exhaust port is directly connected to one of the first channels.

[0010] According to the cover assembly of the battery pack case of some embodiments of the present invention, the number of the first channels is greater than the number of the second channels.

[0011] According to the cover assembly of the battery pack case of some embodiments of the present invention, there are multiple vents, and the multiple vents are spaced apart along the first direction and / or the second direction.

[0012] According to the cover plate assembly of the battery pack case of some embodiments of the present invention, the base plate is provided with the exhaust port that is open in a direction away from the upper cover plate.

[0013] According to the cover plate assembly of the battery pack case in some embodiments of the present invention, the base plate includes a plate body and a protrusion, the plate body is covered on the main case and is provided with the vent, the protrusion is provided on one side edge of the plate body and protrudes in a direction away from the upper cover plate, an exhaust channel is provided in the protrusion, and the exhaust port is formed at the end of the exhaust channel.

[0014] According to the cover assembly of the battery pack case of some embodiments of the present invention, the protrusions are multiple and arranged at intervals, and each of the protrusions is formed with the exhaust port.

[0015] According to the cover plate assembly of the battery pack case in some embodiments of the present invention, the base plate and the upper cover plate are welded together.

[0016] According to the cover assembly of the battery pack case of some embodiments of the present invention, an explosion-proof structure is provided in the exhaust port, and the explosion-proof structure is configured to connect the exhaust port with the outside of the battery pack case when a preset pressure is reached.

[0017] According to the cover assembly of the battery pack case of some embodiments of the present invention, the explosion-proof structure is a one-way explosion-proof valve.

[0018] The present invention also provides a battery pack case.

[0019] According to an embodiment of the present invention, the battery pack case includes: a main case, which is provided with an installation cavity for accommodating battery cells; a cover assembly, which is the cover assembly according to any of the above embodiments, and is covered on the main case and used to seal the installation cavity.

[0020] According to the battery pack case of the embodiment of the present invention, the cover plate assembly has high exhaust efficiency, thereby improving the overall performance of the battery pack case.

[0021] According to the battery pack case of some embodiments of the present invention, the exhaust port is communicated with the outside of the installation cavity.

[0022] The present invention further provides a battery pack.

[0023] A battery pack according to an embodiment of the present invention includes: a battery pack case according to any of the above embodiments.

[0024] According to the battery pack of the embodiment of the present invention, the cover plate assembly has high exhaust efficiency, which improves the overall performance of the battery pack case and improves the thermal safety of the battery pack.

[0025] The present invention further provides an electrical device.

[0026] An electric device according to an embodiment of the present invention includes: a battery pack according to any of the above embodiments.

[0027] According to the electrical equipment of the embodiment of the present invention, the cover plate assembly has high exhaust efficiency, which improves the overall performance of the battery pack case, improves the thermal safety of the battery pack, and enhances the product competitiveness of the electrical equipment.

[0028] According to some embodiments of the present invention, the electrical equipment is a vehicle, the vehicle includes a chassis, and the cover plate assembly is a part of the chassis.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0031] Figure 1 is a schematic diagram of a battery pack case according to an embodiment of the present invention;

[0032] Figure 2 is an exploded view of a battery pack case according to an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of an upper cover plate according to an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of a substrate according to an embodiment of the present invention;

[0035] Figure 5 is a schematic diagram of a cover plate assembly according to another embodiment of the present invention;

[0036] Figure 6 is a schematic diagram of a cover plate assembly according to another embodiment of the present invention.

[0037] Reference numerals:

[0038] Battery pack housing 100; first direction F1; second direction F2;

[0039] Cover plate assembly 1; base plate 11; plate body 111; protrusion 112; vent 113; exhaust port 114;

[0040] Upper cover plate 12; forming groove 121;

[0041] Flow passage 13, first passage 131; second passage 132; one-way explosion-proof valve 14;

[0042] Main box 2; mounting cavity 21; fastener 3. DETAILED DESCRIPTION

[0043] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0046] Hereinafter, with reference to the accompanying drawings, a cover plate assembly 1 of a battery pack case according to an embodiment of the present invention will be described.

[0047] It should be noted that if Figure 1-Figure 2 As shown, the battery pack case 100 includes a main case 2 and a cover assembly 1. The main case 2 is provided with an installation cavity 21, which is used to accommodate battery cells. The cover assembly 1 is covered on the main case 2 and is used to seal the installation cavity 21 to seal the battery cells in the battery pack case 100.

[0048] like Figures 1-6 As shown, the cover assembly 1 of the battery pack case according to an embodiment of the present invention includes: a substrate 11 and an upper cover 12, the substrate 11 is provided with a vent 113 connected to the mounting cavity 21; the upper cover 12 is provided on the side of the substrate 11 away from the main box body 2, and a flow channel 13 is defined between the upper cover 12 and the substrate 11, and at least one of the substrate 11 and the upper cover 12 is provided with an exhaust port 114, and the flow channel 13 connects the vent 113 with the exhaust port 114.

[0049] For example, refer to Figure 1-Figure 4 As shown, the cover plate assembly 1 includes a base plate 11 and an upper cover plate 12. The base plate 11 is provided with a vent 113, which passes through the base plate 11 along the thickness direction and is connected to the mounting cavity 21. The upper cover plate 12 is provided on the side of the base plate 11 facing away from the main box body 2 and is connected to the base plate 11. A flow channel 13 is defined between the upper cover plate 12 and the base plate 11. At least one of the base plate 11 and the upper cover plate 12 is provided with an exhaust port 114. The flow channel 13 is used to connect the vent 113 with the exhaust port 114, and the exhaust port 114 is connected to the space outside the battery pack box 100.

[0050] Illustratively, the exhaust port 114 may be provided on the substrate 11 ; or, the exhaust port 114 may be provided on the upper cover plate 12 ; or, the exhaust port 114 may be provided on both the substrate 11 and the upper cover plate 12 , which is not limited in the present invention.

[0051] During the specific working process, when the battery cell in the installation cavity 21 experiences thermal runaway, the battery cell explosion-proof valve opens, and the battery cell passes high-temperature and high-pressure gas into the installation cavity 21 through the battery cell explosion-proof valve. The high-temperature and high-pressure gas can flow into the flow channel 13 from the vent 113, and the high-temperature and high-pressure gas can flow along the flow channel 13 to the exhaust port 114, and be discharged in a direction to the outside of the battery pack box 100 through the exhaust port 114.

[0052] It can be understood that the flow channel 13 is located outside the installation cavity 21. When high-temperature and high-pressure gas flows into the flow channel 13, the high-temperature and high-pressure gas can be separated from the high-voltage electrical circuit, avoiding the high-voltage arcing problem caused by high-temperature and high-pressure gas and improving thermal safety. The structure of the cover assembly 1 has little impact on the arrangement of battery cells, and the flow channel 13 is subject to fewer design restrictions, which helps to reduce the design difficulty. Compared with the compact exhaust space inside the battery pack body 100, the aspect ratio of the flow channel 13 can be adjusted to arrange a larger volume of the flow channel 13 in the cover assembly 1 to improve the exhaust efficiency of the cover assembly 1.

[0053] In addition, by providing a flow channel 13 in the cover assembly 1, the structural strength of the cover assembly 1 can be enhanced, which is conducive to reducing the probability of deformation of the cover assembly 1, and can increase the insulation space and reduce the transfer of heat to the interior of the passenger compartment.

[0054] According to the cover plate assembly 1 of the battery pack case in an embodiment of the present invention, by arranging the flow channel 13 in the cover plate assembly 1, the high-temperature and high-pressure gas flowing into the flow channel 13 can be separated from the high-voltage electrical circuit, thereby avoiding the high-voltage arcing problem caused by the high-temperature and high-pressure gas and improving thermal safety. Moreover, compared with the compact exhaust space inside the battery pack case 100, a larger flow channel 13 can be arranged in the cover plate assembly 1, which is conducive to improving the exhaust efficiency and enhancing the reliability of the cover plate assembly 1.

[0055] In some embodiments of the present invention, Figure 2-Figure 3 As shown, a molding groove 121 can be provided on the side of the upper cover plate 12 facing the base plate 11. The base plate 11 and the upper cover plate 12 define a flow channel 13 at the molding groove 121. This arrangement can reduce the difficulty of molding the cover plate assembly 1 and reduce processing costs. In addition, the molding groove 121 does not encroach on the space within the mounting cavity 21, which is conducive to fully utilizing the space within the mounting cavity 21 and improving the energy density of the battery pack.

[0056] Of course, the present invention is not limited to this. The forming groove 121 may be provided on the side of the base plate 11 facing the upper cover plate 12; or the forming groove 121 may be provided on the side of the upper cover plate 12 facing the base plate 11, and the forming groove 121 may be provided on the side of the base plate 11 facing the upper cover plate 12, with the forming groove 121 on the upper cover plate 12 being arranged opposite to the forming groove 121 on the base plate 11. This facilitates meeting different design requirements.

[0057] In some embodiments of the present invention, Figure 2-Figure 3 As shown, the flow channel 13 includes a first channel 131 and a second channel 132. The first channel 131 extends along a first direction F1, and the second channel 132 extends along a second direction F2 and communicates with the first channel 131. The first direction F1 and the second direction F2 intersect. For example, the first direction F1 can be set as Figure 1 The front-back direction shown, and the second direction F2 is set Figure 2 Left and right directions shown.

[0058] Through the above-mentioned setting, the flow channel 13 can effectively cover the installation cavity 21, which is conducive to eliminating exhaust dead corners so that high-temperature and high-pressure gas can be discharged in time, thereby improving the thermal safety of the battery pack, and simplifying the structure of the flow channel 13, reducing the difficulty of forming the cover assembly 1.

[0059] In some embodiments of the present invention, Figure 3 As shown, the first channels 131 and the second channels 132 can be provided as a plurality of parallel and spaced apart channels, with the plurality of first channels 131 and the plurality of second channels 132 being arranged in a staggered manner to form the flow channel 13 in a grid-like pattern. This fully covers the mounting cavity 21, greatly improving exhaust efficiency and enhancing the thermal safety of the battery pack.

[0060] In some embodiments of the present invention, Figure 1 As shown, exhaust port 114 can be positioned on one side of the upper cover plate 12 along the first direction F1, with exhaust port 114 directly communicating with one of the first channels 131. In this way, when thermal runaway occurs in the battery cell, high-temperature, high-pressure gas can flow directly into exhaust port 114 along the first channel 131 and out of the battery pack case 100. This arrangement simplifies the flow path, reduces flow resistance, improves exhaust efficiency, and enhances the design rationality of the cover plate assembly 1.

[0061] Preferably, the first direction F1 can be set as the front-to-back direction, and the exhaust port 114 is set behind the upper cover plate 12, so that the exhaust port 114 can be located at the rear of the vehicle body, reducing the impact of high-temperature and high-pressure gas ejection on personal safety.

[0062] Of course, the present invention is not limited thereto, and the exhaust port 114 may be provided on one side of the upper cover plate 12 along the second direction F2; or, the exhaust port 114 may be provided on either side of the upper cover plate 12 along the first direction F1 and the second direction F2. This facilitates meeting different design requirements.

[0063] In some embodiments of the present invention, Figure 3 As shown, the number of first channels 131 can be greater than the number of second channels 132. It is understandable that because the exhaust port 114 is located on one side of the upper cover plate 12 along the first direction F1, the high-temperature and high-pressure gas flowing from the other side of the upper cover plate 12 along the first direction F1 into the flow channel 13 has a longer flow path. By providing a larger number of first channels 131, the flow rate of the high-temperature and high-pressure gas in the first direction F1 can be increased, which is conducive to improving exhaust efficiency and enhancing the practicality of the cover plate assembly 1.

[0064] In some embodiments of the present invention, the number of the second channels 132 is positively correlated with the number of cells arranged along the first direction F1 in the battery pack. Figure 3 As shown, three battery cells can be arranged along the first direction F1, and four second channels 132 can be provided. The four second channels 132 are spaced apart along the first direction F1, so that a second channel 132 is provided at both ends of each battery cell along the first direction F1. This can improve exhaust efficiency and enhance the design rationality of the cover plate assembly 1.

[0065] In some embodiments of the present invention, Figure 4 As shown, there are a plurality of vents 113 , and the plurality of vents 113 are spaced apart along the first direction F1 and / or the second direction F2 .

[0066] For example, a group of vents 113 may be provided on both sides of the cover plate assembly 1 along the first direction F1, with the multiple vents 113 in each group spaced apart along the second direction F2. Alternatively, a group of vents 113 may be provided on both sides of the cover plate assembly 1 along the second direction F2, with the multiple vents 113 in each group spaced apart along the first direction F1. Alternatively, a group of vents 113 may be provided on both sides of the cover plate assembly 1 along the second direction F2, and a group of vents 113 may be provided on both sides of the cover plate assembly 1 along the second direction F2, with the multiple vents 113 in each group spaced apart along the edge of the cover plate assembly 1. This allows high-temperature and high-pressure gas to be introduced into the flow channel 13 more quickly, thereby improving the exhaust efficiency of the cover plate assembly 1.

[0067] In the actual arrangement, the more first channels 131 there are, the more vents 113 there are on both sides of the cover assembly 1 along the first direction F1; the more second channels 132 there are, the more vents 113 there are on both sides of the cover assembly 1 along the second direction F2; the vents 113 located on one side of the cover assembly 1 along the first direction F1 can be arranged to overlap with the first channels 131, so that the position of the vents 113 in the second direction F2 is not restricted, which helps to reduce the design difficulty.

[0068] In some embodiments of the present invention, the vent 113 may be provided near the battery cell explosion-proof valve, thereby timely directing high-temperature and high-pressure gas discharged from the battery cell into the flow channel 13 , thereby improving the exhaust efficiency of the cover plate assembly 1 .

[0069] In some embodiments of the present invention, Figure 1 and Figure 4 As shown, an exhaust port 114 can be provided on the base plate 11, with the exhaust port 114 open in a direction away from the upper cover plate 12, that is, the exhaust port 114 is open downward. This allows the high-temperature, high-pressure gas to be ejected directly downward onto the ground, preventing it from directly spraying onto the passenger compartment or the front and rear compartments, which are more susceptible to ignition, thereby reducing the extent of burn damage to the vehicle body.

[0070] In some embodiments of the present invention, the substrate 11 includes a plate body 111 and a protrusion 112. The plate body 111 is covered on the main box body 2 and is provided with a vent 113. The protrusion 112 is provided on one side edge of the plate body 111 and protrudes in a direction away from the upper cover plate 12. An exhaust channel is provided in the protrusion 112, and an exhaust port 114 is formed at the end of the exhaust channel.

[0071] For example, refer to Figure 4 As shown, the base plate 11 includes a plate body 111 and a protrusion 112. The plate body 111 is matched with the main housing 2 and is used to cover the main housing 2 to seal the installation cavity 21. The plate body 111 is provided with a vent 113, which is connected to the installation cavity 21. The protrusion 112 is provided on a side edge of the plate body 111 and protrudes in a direction away from the upper cover 12. An exhaust channel is provided in the protrusion 112, and an exhaust port 114 is formed at the end of the exhaust channel. The exhaust channel is used to guide high-temperature and high-pressure gas to improve the discharge accuracy of the high-temperature and high-pressure gas.

[0072] Through the above arrangement, the difficulty of forming the exhaust port 114 can be reduced, and the area of ​​the substrate 11 can be reduced, which is beneficial to saving material costs and reducing the space occupied by the cover assembly 1.

[0073] In some embodiments of the present invention, Figure 4As shown, a plurality of protrusions 112 can be provided, and the plurality of protrusions 112 are arranged at intervals, and each protrusion 112 is formed with an exhaust port 114. This can improve the exhaust efficiency of the cover assembly 1, and can disperse the high-temperature and high-pressure gas, thereby avoiding excessive local temperature rise in the vehicle body and improving the safety of the battery pack.

[0074] In some embodiments of the present invention, Figure 2 As shown, the base plate 11 and the upper cover plate 12 are formed separately, and the base plate 11 and the upper cover plate 12 can be welded together, such as by laser welding, penetration welding, etc. Thus, the connection stability between the base plate 11 and the upper cover plate 12 can be ensured, thereby improving the structural stability of the cover plate assembly 1.

[0075] Of course, the present invention is not limited thereto, and the base plate 11 and the upper cover plate 12 may also be connected by gluing or hot pressing, thereby meeting different design requirements.

[0076] In other embodiments of the present invention, the cover plate assembly 1 may be formed in one piece, thereby improving the sealing performance of the flow channel 13 .

[0077] In other embodiments of the present invention, the battery pack case 100 further includes a plurality of fasteners 3, which are spaced apart along the edge of the base plate 11 and are used to securely connect the cover plate assembly 1 and the main case 2. This improves the installation stability of the cover plate assembly 1.

[0078] In some embodiments of the present invention, a separation device can be installed within vent 113 to separate liquid and solid particles carried by high-temperature, high-pressure gas, thereby intercepting the liquid and solid particles. This prevents blockage of flow channel 13, improves the reliability of cover plate assembly 1, and makes thermal runaway invisible, reducing the likelihood of customer perception and eliminating negative impacts.

[0079] In some embodiments of the present invention, a one-way valve may be provided within the vent 113 to direct high-temperature, high-pressure gas in a single direction into the flow channel 13. This prevents the high-temperature, high-pressure gas within the flow channel 13 from flowing back through the vent 113 into the mounting cavity 21, thereby protecting other battery cells and delaying thermal runaway of the battery pack.

[0080] In some embodiments of the present invention, the base plate 11 and the upper cover plate 12 may be integrally die-cast, thereby achieving rapid molding and improving the structural reliability of the cover plate assembly 1 .

[0081] In some embodiments of the present invention, the base plate 11 and the upper cover plate 12 may be made of any one of metal aluminum, steel, and alloys thereof, thereby improving the structural reliability of the cover plate assembly 1 .

[0082] In some embodiments of the present invention, Figure 2 、 Figure 5 and Figure 6 As shown, the cross section of the flow channel 13 can be configured as a cone, rectangle, semicircle, trapezoid, semi-ellipse, etc. This helps to meet different design requirements.

[0083] In some embodiments of the present invention, Figure 6 As shown, when the exhaust port 114 is located on one side of the upper cover plate 12 along the first direction F1 and a second channel 132 is provided on the other side of the upper cover plate 12 along the first direction F1, the second channel 132 located on the other side of the upper cover plate 12 along the first direction F1 can be divided into multiple sub-channels, each of which is used to connect adjacent first channels 131. In this way, the high-temperature and high-pressure gas flowing into the second channel 132 can be prevented from flowing too long along the second direction F2, so that the high-temperature and high-pressure gas can be discharged out of the battery pack case 100 more quickly. As a result, the design rationality of the cover plate assembly 1 is improved.

[0084] In some embodiments of the present invention, Figure 1 As shown, an explosion-proof structure may be provided in the exhaust port 114 , and the explosion-proof structure is configured to connect the exhaust port 114 to the outside of the battery pack case 100 when a preset pressure is reached.

[0085] Specifically, when thermal runaway occurs in the battery cell, the battery cell explosion-proof valve opens, and the battery cell introduces high-temperature gas into the installation cavity 21 through the battery cell explosion-proof valve. The high-temperature and high-pressure gas can flow into the flow channel 13 from the vent 113, and the high-temperature and high-pressure gas flows along the flow channel 13 to the exhaust port 114. The pressure at the exhaust port 114 increases. When the preset pressure is reached, the explosion-proof structure connects the exhaust port 114 with the outside of the battery pack case 100, so that the high-temperature and high-pressure gas can be discharged to the outside of the battery pack case 100 through the exhaust port 114.

[0086] Through the above arrangement, the sealing performance of the battery pack case 100 under normal working conditions can be ensured, the reliability of the battery pack is improved, and the practicality of the cover assembly 1 is improved.

[0087] In some embodiments of the present invention, Figure 1 As shown, the explosion-proof structure can be constructed as a one-way explosion-proof valve 14, which includes a valve body, an elastic member and a partition. The valve body is connected to the exhaust port 114 and has an air outlet. The elastic member is connected to the valve body and the partition respectively. The elastic member is used to apply elastic force to the partition to support the partition on the side wall of the valve body provided with the air outlet, thereby sealing the air outlet.

[0088] During operation, when a battery cell experiences thermal runaway and the pressure at the exhaust port 114 reaches a preset pressure, the elastic member deforms, and the diaphragm of the one-way explosion-proof valve 14 opens the exhaust port, connecting the exhaust port 114 to the outside of the battery pack case 100. When the pressure at the exhaust port 114 falls below the preset pressure, the elastic member returns to its original shape, and the diaphragm of the one-way explosion-proof valve 14 closes the exhaust port, disconnecting the exhaust port 114 from the outside of the battery pack case 100. This isolates the battery cell from air to a certain extent, delaying its explosion, giving passengers more time to escape, and minimizing damage to the battery pack.

[0089] In other embodiments of the present invention, a sealing cover may be provided at the end of the exhaust port 114, and a weak portion may be formed on the sealing cover by etching to form an explosion-proof structure. This can reduce costs and improve the practicality of the cover assembly 1.

[0090] The present invention also provides a battery pack case 100 .

[0091] like Figure 1-Figure 2 As shown, the battery pack case 100 according to an embodiment of the present invention includes: a main case 2 and a cover assembly 1, the main case 2 is provided with an installation cavity 21 for accommodating battery cells; the cover assembly 1 is a cover assembly 1 according to any of the above embodiments, the cover assembly 1 is covered on the main case 2 and is used to seal the installation cavity 21.

[0092] According to the battery pack case 100 of the embodiment of the present invention, the cover plate assembly 1 has high exhaust efficiency, thereby improving the overall performance of the battery pack case 100 .

[0093] In some embodiments of the present invention, Figure 1 As shown, an exhaust port 114 can be provided to communicate with the outside of the mounting cavity 21. Thus, the exhaust port 114 can discharge high-temperature and high-pressure gas directly to the outside of the battery pack case 100, thereby preventing the accumulation of high-temperature and high-pressure gas in the mounting cavity 21 and causing combustion and explosion, thereby improving the safety of the battery pack.

[0094] The present invention further provides a battery pack.

[0095] A battery pack according to an embodiment of the present invention includes: a battery pack case 100 according to any of the above embodiments.

[0096] According to the battery pack of the embodiment of the present invention, the cover plate assembly 1 has high exhaust efficiency, which improves the overall performance of the battery pack case 100 and improves the thermal safety of the battery pack.

[0097] The present invention further provides an electrical device.

[0098] An electric device according to an embodiment of the present invention includes: a battery pack according to any of the above embodiments. It should be noted that the electric device may be an aircraft, a new energy vehicle, a hybrid vehicle, etc.

[0099] According to the electrical equipment of the embodiment of the present invention, the cover plate assembly 1 has high exhaust efficiency, which improves the overall performance of the battery pack box 100, improves the thermal safety of the battery pack, and enhances the product competitiveness of the electrical equipment.

[0100] In some embodiments of the present invention, the electrical device can be a vehicle, which includes a chassis, with the cover plate assembly 1 being a portion of the chassis, i.e., CTC technology or CTB technology. It will be appreciated that the cover plate assembly 1 can enhance the structural strength of the chassis and improve the structural stability of the vehicle. Furthermore, the cover plate assembly 1 can increase thermal insulation space, reducing heat transfer into the passenger compartment, thereby minimizing passenger injuries.

[0101] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0102] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A cover plate assembly (1) of a battery pack box, characterized in that: The battery pack case (100) comprises a main case (2), the main case (2) being provided with an installation cavity (21) for accommodating a battery cell, the cover plate assembly (1) being provided on the main case (2) and being used for sealing the installation cavity (21), the cover plate assembly (1) comprising: A base plate (11), the base plate (11) being provided with a vent (113) communicating with the mounting cavity (21); An upper cover plate (12) is provided on a side of the base plate (11) facing away from the main box body (2), a flow passage (13) is defined between the upper cover plate (12) and the base plate (11), at least one of the base plate (11) and the upper cover plate (12) is provided with an exhaust port (114), and the flow passage (13) connects the vent (113) with the exhaust port (114).

2. The cover plate assembly (1) of the battery pack box according to claim 1, characterized in that: A molding groove (121) is provided on a side of the upper cover plate (12) facing the base plate (11), and the base plate (11) and the upper cover plate (12) define the flow passage (13) at the molding groove (121).

3. The cover plate assembly (1) of the battery pack box according to claim 1, characterized in that: The flow passage (13) comprises a first passage (131) and a second passage (132), wherein the first passage (131) extends along a first direction (F1), and the second passage (132) extends along a second direction (F2) and is connected to the first passage (131), and the first direction (F1) and the second direction (F2) intersect.

4. The cover plate assembly (1) of the battery pack box according to claim 3, characterized in that: The first channels (131) and the second channels (132) are both multiple and spaced apart in parallel, and the multiple first channels (131) and the multiple second channels (132) are arranged in a staggered manner.

5. The cover plate assembly (1) of the battery pack box according to claim 4, characterized in that: The exhaust port (114) is located on one side of the upper cover plate (12) along the first direction (F1), and the exhaust port (114) is directly connected to one of the first channels (131).

6. The cover plate assembly (1) of the battery pack box according to claim 5, characterized in that: The number of the first channels (131) is greater than the number of the second channels (132).

7. The cover plate assembly (1) of the battery pack box according to claim 3, characterized in that: There are a plurality of vents (113), and the plurality of vents (113) are spaced apart and arranged along the first direction (F1) and / or the second direction (F2).

8. The cover plate assembly (1) of the battery pack box according to claim 1, characterized in that: The base plate (11) is provided with the exhaust port (114) which is open in a direction away from the upper cover plate (12).

9. The cover plate assembly (1) of the battery pack box according to claim 8, characterized in that: The base plate (11) comprises a plate body (111) and a protruding portion (112); the plate body (111) is covered on the main box body (2) and is provided with the vent (113); the protruding portion (112) is provided on a side edge of the plate body (111) and protrudes in a direction away from the upper cover plate (12); an exhaust channel is provided in the protruding portion (112), and the exhaust port (114) is formed at the end of the exhaust channel.

10. The cover plate assembly (1) of the battery pack box according to claim 9, characterized in that: The protrusions (112) are multiple and arranged at intervals, and each protrusion (112) is formed with the exhaust channel.

11. The cover plate assembly (1) of the battery pack box according to claim 1, characterized in that: The base plate (11) and the upper cover plate (12) are connected by welding.

12. The cover plate assembly (1) of the battery pack box according to any one of claims 1 to 11, characterized in that: An explosion-proof structure is provided in the exhaust port (114), and the explosion-proof structure is configured to connect the exhaust port (114) with the outside of the battery pack case (100) when a preset pressure is reached.

13. The cover plate assembly (1) of the battery pack box according to claim 12, characterized in that: The explosion-proof structure is a one-way explosion-proof valve (14).

14. A battery pack box (100), characterized in that: include: A main box (2), wherein the main box (2) is provided with a mounting cavity (21) for accommodating a battery cell; A cover assembly (1), wherein the cover assembly (1) is the cover assembly (1) according to any one of claims 1 to 13, and the cover assembly (1) is covered on the main box body (2) and is used to seal the installation cavity (21).

15. The battery pack case (100) according to claim 14, characterized in that: The exhaust port (114) is in communication with the outside of the installation cavity (21).

16. A battery pack, characterized in that: include: The battery pack case (100) according to claim 14 or 15.

17. An electrical device, characterized in that: include: The battery pack according to claim 16.

18. The electrical equipment according to claim 17, characterized in that: The electrical equipment is a vehicle, the vehicle comprises a chassis, and the cover assembly (1) is a part of the chassis.

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