Battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack and electric equipment, the battery pack comprises a frame, a first plate, a bottom protective plate, a cooling plate and a battery monomer, the frame is provided with a first sealing surface, a second sealing surface and a third sealing surface along a first direction; the first plate covers one end of the frame and is in circumferential sealing connection with the first sealing surface; the bottom protection plate covers the other end of the frame and is in circumferential sealing connection with the third sealing surface; the cooling plate is arranged between the first plate piece and the bottom protection plate, the cooling plate is in sealing connection with the second sealing face in the circumferential direction, and exhaust holes are formed in the cooling plate; the first plate, the frame and the cooling plate define an assembly space, the bottom protection plate, the frame and the cooling plate define an exhaust space, and the exhaust space communicates with the exhaust hole. And the battery monomers are assembled in the assembly space. Triple sealing of the battery pack is achieved through the frame structure, the thermoelectric separation function is guaranteed while sealing protection of the whole battery pack is guaranteed, and the integration level of the whole pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and electrical equipment. Background Art

[0002] As new energy technologies mature, new energy vehicles are gradually gaining popularity. For battery-powered vehicles, the stability and safety of the battery system directly impact the overall vehicle's performance. Currently, the battery system's overall thermal and sealing protection capabilities have become key safety indicators for industry competition. Furthermore, with the increasing diversity and complexity of vehicle operating environments and increasing user safety demands, IP protection (dust and water resistance) requirements for battery packs are also increasing.

[0003] Spontaneous combustion of electric vehicles is mainly caused by overheating of the single cells in the battery pack or damage due to external forces, resulting in thermal runaway, which then affects other cells and causes the thermal runaway to spread. The whole process is very rapid. In mild cases, the battery pack will leak and smoke, and in severe cases, the battery pack will catch fire or explode, causing the vehicle to spontaneously combust, seriously threatening personal safety, and even igniting other nearby vehicles, resulting in a secondary accident. Therefore, the protection of battery packs against thermal runaway has always been a topic that the industry has been constantly exploring. Currently, thermoelectric separation technology is mostly used to control the battery pack when the cell experiences thermal runaway, prevent heat spread, and ensure the safety of the entire pack. A key point in thermoelectric separation technology is to prevent the ejecta from the thermal runaway cell from entering the cell area and affecting other normal cells. Therefore, the sealing and isolation of the cell area is very important.

[0004] The battery pack has multiple sealing interfaces, including sealing the entire battery pack from the outside world and sealing the thermal and electrical separation within the battery pack. Currently, multiple components are generally used to achieve the sealing of the entire battery pack and the thermal and electrical separation within the battery pack. However, these multiple components occupy a large space within the battery pack, resulting in a reduction in the available space within the battery pack. Utility Model Content

[0005] The purpose of the present utility model is to provide a battery pack and electrical equipment, so as to reduce the parts required for sealing the battery pack, improve the integration of the battery pack, and increase the available space in the battery pack.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] One aspect of the present application is to provide a battery pack having a first direction, comprising:

[0008] a frame, provided with a first sealing surface, a second sealing surface and a third sealing surface along the first direction, wherein the second sealing surface is located between the first sealing surface and the third sealing surface in the first direction;

[0009] a first plate member, covering one end of the frame in the first direction, the first plate member being circumferentially sealed to the first sealing surface;

[0010] a bottom guard plate, covering the other end of the frame in the first direction, the bottom guard plate being circumferentially sealed to the third sealing surface;

[0011] a cooling plate disposed between the first plate and the bottom guard plate, the cooling plate being circumferentially sealed to the second sealing surface, and having an exhaust hole formed on the cooling plate; the first plate, the frame, and the cooling plate together form an assembly space, the bottom guard plate, the frame, and the cooling plate together form an exhaust space, and the exhaust space is in communication with the exhaust hole;

[0012] The battery cell is assembled in the assembly space.

[0013] In some embodiments, the orthographic projections of the second sealing surface and the third sealing surface along the first direction on a plane perpendicular to the first direction are staggered with each other, and the orthographic projection of the second sealing surface along the first direction on a plane perpendicular to the first direction is located on the side of the orthographic projection of the third sealing surface along the first direction on a plane perpendicular to the first direction close to the center of the bottom guard plate.

[0014] In some embodiments, sealing grooves are formed on the first sealing surface and the second sealing surface, and a first sealing member is embedded in the sealing groove. The first plate and the cooling plate respectively cover the corresponding sealing grooves and are connected to the frame.

[0015] In some embodiments, the battery pack further includes a fixing sleeve, a locking member and a second sealing member. The fixing sleeve is installed in the frame and protrudes from the third sealing surface along the first direction. The second sealing member is arranged on the third sealing surface. The bottom guard plate covers the second sealing member and the fixing sleeve. The locking member passes through the bottom guard plate along the first direction and is assembled in the fixing sleeve.

[0016] In some embodiments, the battery pack further includes a first explosion-proof valve, wherein the first explosion-proof valve is installed on the frame;

[0017] An exhaust cavity is provided in the frame. A first opening and a second opening are provided on the exhaust cavity. The first opening connects the exhaust cavity with the first explosion-proof valve, and the second opening connects the exhaust cavity with the exhaust space.

[0018] In some embodiments, a protrusion is provided on a side of the frame facing the assembly space, and the interior of the protrusion is hollow to form the exhaust cavity.

[0019] In some embodiments, an extension plate is provided on a side of the protrusion facing the assembly space, the extension plate extends into the assembly space, and the second sealing surface portion is provided on a side of the extension plate facing away from the assembly space in the first direction.

[0020] In some embodiments, a plurality of the first explosion-proof valves and the exhaust chambers are provided, and the first explosion-proof valves and the exhaust chambers are provided in one-to-one correspondence and are interconnected.

[0021] In some embodiments, the frame is provided with an installation cavity, the installation cavity is communicated with the first opening, and the first explosion-proof valve partially extends into the installation cavity.

[0022] In some embodiments, the battery pack further includes a protective cover, which is disposed on the first explosion-proof valve and is connected to the frame.

[0023] In some embodiments, a avoidance groove is provided at a connection edge between the cooling plate and the second sealing surface, and the avoidance groove is connected to the second opening to connect the exhaust space and the exhaust cavity.

[0024] In some embodiments, a plurality of grooves are provided on a side of the frame facing the assembly space, and the groove walls form a reinforcing rib structure.

[0025] In some embodiments, a second explosion-proof valve is provided on the side wall of the battery cell facing the cooling plate. In the first direction, the second explosion-proof valve is arranged opposite to the exhaust hole, and the orthographic projection of the second explosion-proof valve on the cooling plate along the first direction falls into the corresponding exhaust hole.

[0026] In some embodiments, a barrier and an adhesive layer are provided on the side of the cooling plate facing the battery cell, the barrier covers the exhaust hole, the side of the adhesive layer facing the battery cell is flush with the side of the barrier facing the battery cell, and the battery cell and the cooling plate are fixedly connected through the adhesive layer.

[0027] Another aspect of the present application is to provide an electrical device comprising the battery pack as described above.

[0028] Compared with the prior art, the battery pack and electrical equipment of the present invention have the following advantages:

[0029] The battery pack of the embodiment of the present invention is integrated with a first sealing surface, a second sealing surface and a third sealing surface on the frame. The first plate is sealed to the first sealing surface, the cooling plate is sealed to the second sealing surface, and the bottom guard plate is sealed to the third sealing surface, so that the first plate, the frame and the cooling plate together form an assembly space for assembling battery cells, and the bottom guard plate, the frame and the cooling plate together form an exhaust space. The sealed connection between the first plate, the bottom guard plate and the frame achieves sealed protection between the entire battery pack and the outside world, ensuring that the battery pack is protected from external environmental intrusions such as dust and water vapor; the sealed connection between the cooling plate and the frame separates the internal space of the battery pack into an assembly space and an exhaust space, achieving thermoelectric separation and improving the safety of the entire pack. Therefore, the present application achieves triple sealing of the battery pack through the frame structure itself, ensuring the thermoelectric separation function while ensuring the sealing protection of the entire battery pack, reducing the many components required for sealing, improving the integration of the entire pack, and increasing the available space in the battery pack.

[0030] The present application separates the assembly space and the exhaust space by a cooling plate. When a thermal runaway spray valve occurs in a battery cell in the assembly space, the ejected material can pass through the exhaust hole of the cooling plate and enter the exhaust space. When the high-temperature and high-pressure ejected material enters the exhaust space and diffuses, the cooling plate can cool the ejected material. The subsequently diluted and cooled gas is discharged to the outside of the battery pack through the exhaust space, actively reducing the temperature of the gas generated by thermal runaway, and preventing the combustible gas generated by thermal runaway from catching fire after being discharged outside the battery pack due to the still high temperature and contact with oxygen in the air meeting the ignition conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0032] Figure 2 is an exploded view of the battery pack described in an embodiment of the present application;

[0033] Figure 3 is a schematic top view of the battery pack according to an embodiment of the present application;

[0034] Figure 4 yes Figure 3 AA section view in the figure;

[0035] Figure 5 yes Figure 4 A magnified schematic diagram of middle B;

[0036] Figure 6 yes Figure 4 A magnified schematic diagram of middle C;

[0037] Figure 7 yes Figure 4 A magnified schematic diagram of D in the middle;

[0038] Figure 8 is a schematic top view of the battery pack described in an embodiment of the present application without the battery module;

[0039] Figure 9 yes Figure 8 EE section view in the figure;

[0040] Figure 10 yes Figure 9 Middle F is an enlarged schematic diagram;

[0041] Figure 11 This is a schematic structural diagram of a frame in an embodiment of the present application;

[0042] Figure 12 Schematic diagram of the structure of the barrier member and the adhesive layer in an embodiment of the present application;

[0043] Figure 13 Schematic diagram of the cooling plate in an embodiment of the present application.

[0044] Numbers in the figure:

[0045] 10. Frame; 101. Exhaust cavity; 1011. First opening; 1012. Second opening; 102. Recess; 103. Protrusion; 1031. Extension plate; 104. Mounting cavity; 11. First sealing surface; 111. Sealing groove; 112. First sealing member; 113. Fixing member; 114. Mounting hole; 12. Second sealing surface; 13. Third sealing surface; 131. Fixing sleeve; 132. Locking member; 133. Second sealing member;

[0046] 20. First plate;

[0047] 30. Bottom guard plate;

[0048] 40. Cooling plate; 401. Exhaust hole; 402. Avoidance groove; 403. Water inlet; 404. Water outlet; 41. Assembly space; 42. Exhaust space;

[0049] 50. Battery module; 51. Battery cell; 511. Second explosion-proof valve;

[0050] 60. Barriers;

[0051] 70. First explosion-proof valve; 71. Protective cover;

[0052] 80. Adhesive layer;

[0053] Z, first direction. DETAILED DESCRIPTION

[0054] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] In the description of this utility model, 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 connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0056] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0057] See Figure 1-Figure 2 、 Figure 7 、 Figure 9-10 As shown, the embodiment of the present invention provides a battery pack having a first direction Z, including a frame 10, a first plate 20, a bottom guard plate 30, a cooling plate 40 and a battery cell 51, the frame 10 is provided with a first sealing surface 11, a second sealing surface 12 and a third sealing surface 13 along the first direction Z, and in the first direction Z, the second sealing surface 12 is located between the first sealing surface 11 and the third sealing surface 13; the first plate 20 is covered at one end of the frame 10 in the first direction Z, and the first plate 20 is circumferentially sealed to the first sealing surface 11; the bottom guard plate 30 is covered at the other end of the frame 10 in the first direction Z, and the bottom guard plate 30 is circumferentially sealed to the third sealing surface 13; the cooling plate 40 is provided at the other end of the frame 10 in the first direction Z, and the bottom guard plate 30 is circumferentially sealed to the third sealing surface 13; 0 is arranged between the first plate 20 and the bottom guard plate 30, the cooling plate 40 is circumferentially sealed with the second sealing surface 12, and the cooling plate 40 is provided with an exhaust hole 401; the first plate 20, the frame 10, and the cooling plate 40 together form an assembly space 41, and the assembly space 41 is used to install the battery cell 51; the bottom guard plate 30, the frame 10, and the cooling plate 40 together form an exhaust space 42, and the exhaust space 42 is connected to the exhaust hole 401. The exhaust space 42 serves as an exhaust channel to exhaust and dissipate heat when the battery cell 51 thermally runs away and the explosion-proof valve explodes. The ejected matter of the battery cell 51 can pass through the exhaust hole 401 and enter the exhaust channel; the battery cell 51 is assembled in the assembly space 41.

[0058] A first sealing surface 11, a second sealing surface 12, and a third sealing surface 13 are integrated into the frame 10. The first plate 20 is sealed to the first sealing surface 11, the cooling plate 40 is sealed to the second sealing surface 12, and the bottom guard plate 30 is sealed to the third sealing surface 13. The first plate 20, the frame 10, and the cooling plate 40 together form an assembly space 41 for assembling the battery cells 51, and the bottom guard plate 30, the frame 10, and the cooling plate 40 together form an exhaust space 42. The sealed connection between the first plate 20, the bottom guard plate 30, and the frame 10 provides a sealed protection between the entire battery pack and the outside world, protecting the battery pack from external environmental intrusions such as dust and moisture. The sealed connection between the cooling plate 40 and the frame 10 separates the internal space of the battery pack into an assembly space 41 and an exhaust space 42, achieving thermal and electrical separation and enhancing the safety of the entire pack. Therefore, the present application realizes triple sealing of the battery pack through the structure of the frame 10 itself, which ensures the sealing protection of the entire battery pack while ensuring the thermal and electrical separation functions, reduces the many components required for sealing, improves the integration of the entire pack, and increases the available space in the battery pack.

[0059] The present application separates the assembly space 41 and the exhaust space 42 by a cooling plate 40. When a thermal runaway spray valve occurs in the battery cell 51 in the assembly space 41, the ejected material can pass through the exhaust hole 401 of the cooling plate 40 and enter the exhaust space 42. When the high-temperature and high-pressure ejected material enters the exhaust space 42 and diffuses, the cooling plate 40 can cool the ejected material. The subsequently diluted and cooled gas is discharged to the outside of the battery pack through the exhaust space 42, actively reducing the temperature of the gas generated by thermal runaway, and preventing the combustible gas generated by thermal runaway from catching fire after being discharged outside the battery pack due to the still high temperature and contact with oxygen in the air meeting the ignition conditions.

[0060] The first sealing surface 11, the second sealing surface 12, and the third sealing surface 13 are arranged in sequence along the first direction Z. The first sealing surface 11 and the third sealing surface 13 are located at both ends of the frame 10 in the first direction Z. A step extending toward the interior of the battery pack is provided on the frame 10, and the second sealing surface 12 is provided on the step. The side of the cooling plate 40 facing the assembly space 41 is sealed with the second sealing surface 12. There is a certain distance between the second sealing surface 12 and the third sealing surface 13 in the first direction Z. The distance between the two can accommodate the installation of the cooling plate 40, and the cooling plate 40 can separate an independent exhaust space 42 inside the battery pack to achieve thermal and electrical separation. The exhaust space 42 has a certain height so that the exhaust space 42 can accommodate the eruption and have a sufficient exhaust effect.

[0061] See Figure 11As shown, in some embodiments, the frame 10 includes a plurality of side beam monomers, and the plurality of side beam monomers are connected end to end in sequence to form a frame structure. The specific configuration of each side beam monomer can be the same or different. Each side beam monomer is provided with a first sealing surface 11, a second sealing surface 12 and a third sealing surface 13 along the first direction Z, and the first sealing surface 11 of each side beam monomer is on the same plane, the second sealing surface 12 of each side beam monomer is on the same plane, and the third sealing surface 13 of each side beam monomer is on the same plane, so as to better provide a connection plane for the sealing between the corresponding matching components (first plate 20, cooling plate 40, bottom guard plate 30) and the frame 10 to ensure the sealing effect, and the connection plane where each sealing surface is located is consistent with the pressure environment, so it is not easy to have unbalanced points, resulting in weak areas, affecting the sealing effect and service life. In other embodiments, the frame 10 can also be an integrated enclosed frame structure.

[0062] See 5- Figure 7 As shown, in some embodiments, the orthographic projections of the second sealing surface 12 and the third sealing surface 13 along the first direction Z on a plane perpendicular to the first direction Z are staggered, and the orthographic projection of the second sealing surface 12 along the first direction Z on a plane perpendicular to the first direction Z is located on a side of the orthographic projection of the third sealing surface 13 along the first direction Z on a plane perpendicular to the first direction Z that is closer to the center of the bottom guard plate 30. Staggering the second sealing surface 12 and the third sealing surface 13 in both height and plane avoids affecting the sealing assembly and sealing effect of the cooling plate 40, the bottom guard plate 30, and the corresponding sealing surfaces, and also prevents the simultaneous influence of factors that may affect the sealing on one sealing surface on the other sealing surface.

[0063] See Figure 5 and Figure 7As shown, in some embodiments, a sealing groove 111 is provided on both the first sealing surface 11 and the second sealing surface 12, and a first sealing member 112 is embedded in the sealing groove 111. The first plate 20 and the cooling plate 40 respectively cover the corresponding sealing grooves 111 and are connected to the frame 10. The frame 10 is provided with mounting holes 114 on the first sealing surface 11 and the second sealing surface 12. The fixing member 113 passes through the first plate 20 and the cooling plate 40 and is assembled in the mounting hole 114 to achieve connection with the frame 10, thereby achieving a sealing effect. The mounting holes 114 of the first sealing surface 11 and the second sealing surface 12 can be the same or different. For example, the mounting hole 114 provided on the first sealing surface 11 is a threaded hole, and the fixing member 113 is a locking screw. The locking screw is matched with the threaded hole to press the first plate 20 onto the first sealing surface 11 and fix it to the frame 10. The mounting hole 114 on the second sealing surface 12 is a through hole. Correspondingly, a corresponding through hole is formed on the cooling plate 40. The fixing member 113 is a blind rivet. The blind rivet passes through the through hole and rivets to achieve fixed connection between the cooling plate 40 and the frame 10.

[0064] The sealing grooves 111 extend along the circumference of the frame 10. Depending on the size of the sealing surface on which they are located, one or more sealing grooves 111 may be provided. For example, two sealing grooves 111 may be provided on the first sealing surface 11. Both sealing grooves 111 are annular and extend along the circumference of the frame 10. In this case, the mounting hole 114 may be provided between the two sealing grooves 111 to prevent the fixing member 113 and the mounting hole 114 from penetrating the first sealing member 112 within the sealing grooves 111. This, while maintaining a tight connection between the first plate 20 and the frame 10, enhances the sealing effect.

[0065] The first sealing member 112 can specifically be sealing foam, sealant, etc. When the first sealing member 112 is sealant, the sealing groove 111 is provided to facilitate the injection and placement of the sealant. The notch of the sealing groove 111 is in an open state, which is convenient for the glue filling operation, and the qualified rate of the sealing operation is high. When the first sealing member 112 is a compressible sealing member such as sealing foam, the compression amount of the compressible sealing member can be controlled by controlling the depth dimension of the sealing groove 111. The compressed height of the compressible sealing member in the maximum compressible state is the depth of the sealing groove 111, thereby ensuring that the compression rate of the compressible sealing member is within an appropriate range, ensuring the compression effect and improving the service life.

[0066] See Figure 6 and Figure 7As shown, in some embodiments, the battery pack further includes a fixing sleeve 131, a locking member 132, and a second sealing member 133. The fixing sleeve 131 is installed within the frame 10 and protrudes from the third sealing surface 13 along the first direction Z. The second sealing member 133 is disposed on the third sealing surface 13. The bottom guard plate 30 is disposed over the second sealing member 133 and the fixing sleeve 131. The locking member 132 passes through the bottom guard plate 30 along the first direction Z and is assembled within the fixing sleeve 131. The third sealing surface 13 is a planar seal. The opposing surfaces of the second sealing member 133 respectively mate with the bottom guard plate 30 and the third sealing surface 13. The locking member 132 cooperates with the fixing sleeve 131 to securely connect the bottom guard plate 30 to the frame 10. The fixing sleeve 131 is embedded within the frame 10 and partially protrudes from the third sealing surface 13. The protruding portion of the fixing sleeve 131 provides a support surface for locking and fixation, while also controlling the compression dimension of the second sealing member 133. The locking member 132 is a screw, and the fixing sleeve 131 is a threaded sleeve.

[0067] See Figure 9 and Figure 10 As shown, in some embodiments, the battery pack further includes a first explosion-proof valve 70, which is mounted on the frame 10. A vent cavity 101 is defined within the frame 10, and the vent cavity 101 is provided with a first opening 1011 and a second opening 1012. The first opening 1011 connects the vent cavity 101 with the first explosion-proof valve 70, and the second opening 1012 connects the vent cavity 101 with the vent space 42. The first opening 1011 and the second opening 1012 connect the vent cavity 101 with the vent space 42, the vent cavity 101, and the first explosion-proof valve 70 in sequence. After the ejected matter from the battery cell 51 enters the vent space 42, it can enter the vent cavity 101 through the second opening 1012, then enter the first explosion-proof valve 70 through the first opening 1011, and be discharged to the outside of the battery pack through the first explosion-proof valve 70. Multiple first explosion-proof valves 70 and multiple exhaust cavities 101 are provided, and the positions of the exhaust cavities 101 correspond to the positions of the first explosion-proof valves 70, and the exhaust cavities 101 are connected to the corresponding first explosion-proof valves 70. In this embodiment, two first explosion-proof valves 70 and two exhaust cavities 101 are provided.

[0068] The exhaust cavity 101 is directly set in the frame 10 to form the required exhaust space part, which can avoid setting a cover outside the frame 10 to form the exhaust space, thereby improving the integration of components. It should be noted that when the space inside the frame 10 is not enough to form the required size of the exhaust cavity 101, the frame 10 can be appropriately protruded toward the center of the battery pack, and the exhaust cavity 101 is formed by the protruding portion, and the protruding portion can also be used to install sensors or serve as a fixing platform for other components in the battery pack. In some embodiments, a protrusion 103 is provided on the side of the frame 10 facing the assembly space 41, and the interior of the protrusion 103 is hollow to form the exhaust cavity 101. The exhaust cavity 101 is formed by the protrusion 103 and can be used to install sensors or serve as a fixing platform for other components in the battery pack. The first opening 1011 and the second opening 1012 are both opened on the protrusion 103. An extension plate 1031 is provided on the side of the protrusion 103 facing the assembly space 41. The extension plate 1031 extends into the assembly space 41. The second sealing surface 12 is partially provided on a side of the extension plate 1031 facing away from the assembly space 41 in the first direction Z. The extension plate 1031 serves as a supporting plate for the second sealing surface 12, thereby preventing the second opening (1012) of the protrusion 103 from being blocked when the cooling plate 40 is connected to the second sealing surface 12.

[0069] In some embodiments, the frame 10 is provided with an installation cavity 104, which is in communication with the first opening 1011, and the first explosion-proof valve 70 partially extends into the installation cavity 104. The installation cavity 104 provides sufficient installation space for the first explosion-proof valve 70, and the installation cavity 104 serves as a transition space between the first opening 1011 and the first explosion-proof valve 70, thereby reducing the opening size requirement of the first opening 1011.

[0070] See Figure 9 and Figure 10 As shown, in some embodiments, the battery pack further includes a protective cover 71 , which is disposed outside the first explosion-proof valve 70 and connected to the frame 10 to provide protection for the first explosion-proof valve 71 .

[0071] In some embodiments, the exhaust chamber 101 is further provided with a third opening, which may be multiple, and is configured to accommodate a temperature sensor and / or a pressure sensor inserted into the third opening. The temperature sensor can detect the temperature of the gas flowing into the exhaust chamber 101, and the pressure sensor can detect the pressure of the gas flowing into the exhaust chamber 101.

[0072] See Figure 13As shown, in some embodiments, a relief groove 402 is formed at the connecting edge of the cooling plate 40 and the second sealing surface 12. The relief groove 402 is connected to the second opening 1012 to connect the exhaust space 42 with the exhaust cavity 101. The relief groove 402 provides a communication channel between the exhaust space 42 and the exhaust cavity 101, allowing the spray valve material in the exhaust space 42 to pass through the relief groove 402 and the second opening 1012 into the exhaust cavity 101. The provision of the relief groove 402 facilitates the communication between the exhaust space 42 and the exhaust cavity 101.

[0073] See Figure 11 As shown, in some embodiments, a plurality of grooves 102 are provided on a side of the frame 10 facing the assembly space 41. The walls of the grooves 102 form a reinforcing rib structure, which can reduce weight while ensuring sufficient strength of the frame 10. The notches of the grooves 102 are arranged toward the assembly space 41. The grooves 102 can be provided on the side of the frame 10 where the exhaust cavity 101 is provided.

[0074] In some embodiments, the cooling plate 40 is a liquid-cooled plate. A cooling pipe is provided on the side of the cooling plate 40 facing the exhaust space 42. One end of the cooling plate 40 is provided with a water inlet 403 and a water outlet 404 connected to the cooling pipe, allowing cooling water to flow into the cooling pipe. The cooling water entering the cooling pipe achieves a cooling effect. An avoidance groove 402 is provided at the other end of the cooling plate 40. Multiple exhaust holes 401 are provided, arranged in a row on the cooling plate 40, avoiding the installation of the cooling pipe.

[0075] See Figure 4 and Figure 7As shown, in some embodiments, multiple battery cells 51 are provided. These multiple battery cells 51 are sequentially arranged within the assembly space 41 and connected to form a battery module 50. A second explosion-proof valve 511 is provided on the side wall of the battery cell 51 facing the cooling plate 40. In the first direction Z, the second explosion-proof valve 511 is positioned opposite the exhaust hole 401, and its orthographic projection along the first direction Z falls within the corresponding exhaust hole 401. The second explosion-proof valve 511 protects the battery cell 51 from excessive internal pressure. When the internal pressure of the battery cell 51 reaches a certain level, the second explosion-proof valve 511 activates, releasing explosives to balance the internal pressure of the battery cell 51, thereby preventing explosion and ensuring the safety of the battery cell 51. Positioning the second explosion-proof valve 511 on the side wall of the battery cell 51 facing the cooling plate 40 keeps it away from the first plate 20, and therefore away from the passenger compartment. This prevents explosives from directly erupting into the passenger compartment during an explosion, improving safety and reducing potential damage to the passenger compartment. The orthographic projection of the second explosion-proof valve 511 along the first direction Z falls within the corresponding exhaust hole 401. The cross-sectional area of ​​the second explosion-proof valve 511 is smaller than the area of ​​the exhaust hole 401, preventing the second explosion-proof valve 511 from being blocked by the cooling plate 40, thereby providing an unobstructed exhaust path. When a battery cell 51 is opened, the material released from the second explosion-proof valve 511 can be discharged smoothly through the exhaust hole 401, preventing obstruction of the second explosion-proof valve 511 and the resulting explosion hazard. If multiple battery cells 51 are provided, multiple exhaust holes 401 are provided accordingly, with the second explosion-proof valves 511 on each battery cell 51 corresponding to the exhaust holes 401.

[0076] See Figure 2 and Figure 12As shown, in some embodiments, a barrier 60 and an adhesive layer 80 are provided on the side of the cooling plate 40 facing the battery cell 51. The barrier 60 is provided to cover the vent 401, and the side of the adhesive layer 80 facing the battery cell 51 is flush with the side of the barrier 60 facing the battery cell 51. The battery cell 51 is fixedly connected to the cooling plate 40 via the adhesive layer 80. The barrier 60 seals the vent 401, so that when the battery cell 51 is operating normally, the assembly space 41 and the exhaust space 42 are each relatively independent and enclosed spaces, achieving a sealed isolation between the assembly space 41 and the exhaust space 42. When a battery cell 51 experiences thermal runaway and erupts, the erupted material passes through the barrier 60 into the vent 401, and then into the exhaust space 42 through the vent 401. An adhesive layer 80 is also provided between the battery cell 51 and the cooling plate 40. The adhesive layer 80 is coplanar with the barrier 60 and occupies the space between the battery cell 51 and the cooling plate 40. The adhesive layer 80 not only secures the battery cells 51 and the cooling plate 40, ensuring a tight connection, but also fills the gap between the battery cells 51 and the cooling plate 40, preventing ejected material from the battery cells 51 from spreading laterally along the side of the cooling plate 40 facing the battery cells 51 and preventing it from entering the vents 401. If multiple vents 401 are provided, the barrier 60 is positioned one-to-one with each vent 401. The barrier 60 may be a mica plate.

[0077] In the present application, when a thermal runaway explosion occurs in the battery cell 51, the discharge path of the eruptive material is as follows: after the eruptive material is ejected through the second explosion-proof valve 511, it breaks through the barrier 60 and enters the exhaust hole 401, enters the exhaust space 42 through the exhaust hole 401, and then enters the exhaust cavity 101 through the avoidance groove 402 and the second opening 1012, and then enters the first explosion-proof valve 70 through the first opening 1011 of the exhaust cavity 101, and is discharged to the outside of the battery pack through the first explosion-proof valve 70.

[0078] The present application also provides an electrical device comprising the battery pack described above.

[0079] In summary, the embodiments of the present invention provide a battery pack and electrical equipment, which achieves sealed protection between the entire battery pack and the outside world through the sealed connection between the first plate 20, the bottom guard plate 30 and the frame 10, ensuring that the battery pack is protected from external environmental intrusions such as dust, water vapor, etc.; through the sealed connection between the cooling plate 40 and the frame 10, the internal space of the battery pack is divided into an assembly space 41 and an exhaust space 42, achieving thermal and electrical separation, and improving the safety of the entire pack. The triple sealing of the battery pack is achieved through the frame structure itself, which ensures the thermal and electrical separation function while ensuring the sealed protection of the entire battery pack, reducing the number of components required for sealing, improving the integration of the entire pack, and increasing the available space in the battery pack.

[0080] The assembly space 41 and the exhaust space 42 are separated by the cooling plate 40. When a thermal runaway spray valve occurs in the battery cell 51 in the assembly space 41, the ejected material can pass through the exhaust hole 401 of the cooling plate 40 and enter the exhaust space 42. When the high-temperature and high-pressure ejected material enters the exhaust space 42 and diffuses, the cooling plate 40 can cool the ejected material. The subsequently diluted and cooled gas is discharged to the outside of the battery pack through the exhaust space 42, actively reducing the temperature of the gas generated by thermal runaway, and preventing the combustible gas generated by thermal runaway from catching fire after being discharged outside the battery pack due to the still high temperature and contact with oxygen in the air meeting the ignition conditions.

[0081] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A battery pack having a first direction (Z), characterized in that: include: A frame (10) is provided with a first sealing surface (11), a second sealing surface (12), and a third sealing surface (13) along the first direction (Z), wherein the second sealing surface (12) is located between the first sealing surface (11) and the third sealing surface (13) in the first direction (Z); a first plate (20) covering one end of the frame (10) in the first direction (Z), the first plate (20) being circumferentially sealed to the first sealing surface (11); a bottom guard plate (30) covering the other end of the frame (10) in the first direction (Z), the bottom guard plate (30) being circumferentially sealedly connected to the third sealing surface (13); A cooling plate (40) is provided between the first plate (20) and the bottom guard plate (30), the cooling plate (40) is circumferentially sealed to the second sealing surface (12), and an exhaust hole (401) is provided on the cooling plate (40); the first plate (20), the frame (10), and the cooling plate (40) together form an assembly space (41), the bottom guard plate (30), the frame (10), and the cooling plate (40) together form an exhaust space (42), and the exhaust space (42) is communicated with the exhaust hole (401); A battery cell (51) is assembled in the assembly space (41).

2. The battery pack according to claim 1, wherein: The orthographic projections of the second sealing surface (12) and the third sealing surface (13) along the first direction (Z) on a plane perpendicular to the first direction (Z) are staggered with each other, and the orthographic projection of the second sealing surface (12) along the first direction (Z) on a plane perpendicular to the first direction (Z) is located on a side of the orthographic projection of the third sealing surface (13) along the first direction (Z) on a plane perpendicular to the first direction (Z) close to the center of the bottom guard plate (30).

3. The battery pack according to claim 1, wherein: A sealing groove (111) is provided on the first sealing surface (11) and the second sealing surface (12), a first sealing member (112) is embedded in the sealing groove (111), and the first plate (20) and the cooling plate (40) respectively cover the corresponding sealing groove (111) and are connected to the frame (10).

4. The battery pack according to claim 1, wherein: The battery pack further comprises a fixing sleeve (131), a locking member (132) and a second sealing member (133); the fixing sleeve (131) is installed in the frame (10) and protrudes from the third sealing surface (13) along the first direction (Z); the second sealing member (133) is arranged on the third sealing surface (13); the bottom guard plate (30) covers the second sealing member (133) and the fixing sleeve (131); the locking member (132) passes through the bottom guard plate (30) along the first direction (Z) and is assembled in the fixing sleeve (131).

5. The battery pack according to claim 1, wherein: The battery pack further includes a first explosion-proof valve (70), and the first explosion-proof valve (70) is installed on the frame (10); An exhaust cavity (101) is provided in the frame (10), and a first opening (1011) and a second opening (1012) are provided on the exhaust cavity (101), wherein the first opening (1011) connects the exhaust cavity (101) with the first explosion-proof valve (70), and the second opening (1012) connects the exhaust cavity (101) with the exhaust space (42).

6. The battery pack according to claim 5, characterized in that: A protrusion (103) is provided on one side of the frame (10) facing the assembly space (41), and the interior of the protrusion (103) is hollow to form the exhaust cavity (101).

7. The battery pack according to claim 6, characterized in that: An extension plate (1031) is provided on a side of the protrusion (103) facing the assembly space (41), and the extension plate (1031) is extended into the assembly space (41). The second sealing surface (12) is partially provided on a side of the extension plate (1031) facing away from the assembly space (41) in the first direction (Z).

8. The battery pack according to claim 5, characterized in that: A plurality of the first explosion-proof valves (70) and the exhaust chambers (101) are provided, and the first explosion-proof valves (70) and the exhaust chambers (101) are provided in a one-to-one correspondence and are communicated with each other.

9. The battery pack according to claim 5, characterized in that: The frame (10) is provided with a mounting cavity (104), the mounting cavity (104) is in communication with the first opening (1011), and the first explosion-proof valve (70) partially extends into the mounting cavity (104).

10. The battery pack according to claim 5, characterized in that: The battery pack further comprises a protective cover (71), wherein the protective cover (71) is provided on the first explosion-proof valve (70), and the protective cover (71) is connected to the frame (10).

11. The battery pack according to claim 5, characterized in that: An avoidance groove (402) is provided at the connection edge between the cooling plate (40) and the second sealing surface (12), and the avoidance groove (402) is connected to the second opening (1012) to connect the exhaust space (42) and the exhaust cavity (101).

12. The battery pack according to claim 1, wherein: A plurality of grooves (102) are provided on a side of the frame (10) facing the assembly space (41), and the groove walls of the grooves (102) form a reinforcing rib structure.

13. The battery pack according to claim 1, wherein: A second explosion-proof valve (511) is provided on the side wall of the battery cell (51) facing the cooling plate (40); in the first direction (Z), the second explosion-proof valve (511) is arranged opposite to the exhaust hole (401), and the orthographic projection of the second explosion-proof valve (511) on the cooling plate (40) along the first direction (Z) falls into the corresponding exhaust hole (401).

14. The battery pack according to claim 1, wherein: A barrier (60) and an adhesive layer (80) are provided on one side of the cooling plate (40) facing the battery cell (51); the barrier (60) is arranged to cover the exhaust hole (401); the side of the adhesive layer (80) facing the battery cell (51) is flush with the side of the barrier (60) facing the battery cell (51); and the battery cell (51) and the cooling plate (40) are fixedly connected via the adhesive layer (80).

15. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 14.

Images