Battery pack box and battery pack

Abstract

Battery pack box comprising: a base plate (3) comprising an upper plate (31), a lower plate (32) and several connecting projections (33), wherein the several connecting projections (33) are spaced apart between the upper plate (31) and the lower plate (32) to form a pressure relief cavity (34) between the upper plate (31) and the lower plate (32), wherein the upper plate (31) serves to support several batteries (100) and is provided with pressure relief holes (311) which are uniquely assigned to explosion protection valves on the individual batteries (100), wherein the pressure relief holes (311) are connected to the pressure relief cavity (34); a box housing (1), wherein the base plate (3) is connected to one side of the box housing (1) and inside the box housing (1) a buffer cavity (11) which is connected to the pressure relief cavity (34) A connection is in place, is planned;at least one pressure relief valve (5) arranged on the box housing (1) and connected to the buffer cavity (11); a top cover plate (2) connected to the other side of the box housing (1) and interacting with the bottom protection plate (3) to form a receiving cavity for receiving the multiple batteries (100).

Description

FIELD OF APPLICATIONThe present application relates to the technical field of batteries, specifically, to a battery pack box and a battery pack.PRIOR ARTAs the demand for power supply is increasing, a plurality of batteries are generally combined to increase power supply efficiency, and thereby power is supplied using a battery pack. After prolonged use of the battery cells, the temperature rises, not only impairing the power supply efficiency of the battery cells, but also causing the risk of explosion at too high a pressure due to the generation of a pressurized gas inside the batteries. Therefore, by providing an explosion protection valve on the individual battery cell, it is achieved that, in the case of too high a pressure within the respective battery, gas which results from a thermal runaway breaks through the respective explosion protection valve, whereby pressure relief and protection of the interior of the battery are achieved.A battery pack represents a closed environment. In addition to a plurality of battery cells connected to one another, an electrical module for management is also provided therein. If, at too high a pressure within one of the battery cells, gas resulting from the thermal runaway breaks through the respective explosion protection valve, then the gas resulting from the thermal runaway flows around in the battery pack, thereby damaging other battery cells and the electrical module for management.SUMMARYAccording to a first aspect, an embodiment of the present application provides a battery pack box including:a bottom protection panel comprising an upper panel, a lower panel and a plurality of connecting protrusions, the plurality of connecting protrusions being spacedly disposed between the upper panel and the lower panel to form a pressure relief cavity between the upper panel and the lower panel, the upper panel for supporting a plurality of batteries and being provided with pressure relief holes uniquely associated with explosion protection valves on the individual batteries, the pressure relief holes communicating with the pressure relief cavity;a box housing, wherein the bottom protection plate is connected to one side of the box housing, and a buffer cavity communicating with the pressure relief cavity is provided inside the box housing;at least one pressure relief valve disposed on the box housing and in communication with the buffer cavity;an upper lid plate connected to the other side of the case case and cooperating with the bottom protection plate to form a receiving cavity for receiving the plurality of batteries.According to a second aspect, an embodiment of the present application provides a battery pack including the above-described battery pack box.The present application provides a battery pack box. By providing a plurality of connecting protrusions between the upper plate and the lower plate, the pressure relief cavity communicating with the pressure relief holes in the upper plate is formed between the upper plate and the lower plate. By providing the box housing with the buffer cavity communicating with the pressure relief cavity and providing the box housing with at least one pressure relief valve communicating with the buffer cavity, gas resulting from the thermal runaway enters the respective battery after the respective explosion protection valve is broken sequentially into the pressure relief cavity and the buffer cavity via the pressure relief holes, and is finally discharged via the pressure relief valve connected to the box housing. Thus, on the one hand, pressurized gas can be released from the battery and, on the other hand, the pressure release path for gas resulting from the thermal runaway is defined to prevent the gas resulting from the thermal runaway from flowing around and damage to internal components caused thereby, and thus achieve good protection capability and high safety.The present application further provides a battery pack that controls gas resulting from the thermal runaway by using the above-described battery pack box to avoid damage to the components inside the battery pack due to impact by gas resulting from the thermal runaway, thus enhancing protection for internal components of the battery pack and thus extending the life of the battery pack.SPECIFICATION OF THE APPLICATIONFIG. 1 is a structural view of the battery pack according to the present application in disassembled state; FIG. 2 is a sectional view of the battery pack according to the present application; FIG. 3 is an exploded structural view of the bottom protection plate in the battery pack case according to the present application; FIG. 4 is a structural view of the upper plate constituting the bottom protection plate in the battery pack case according to the present application; FIG. 5 is a structural view of the bottom plate constituting the bottom protection plate in the battery pack case according to the present application; FIG. 6 is a schematic structural view of the top cover plate in the battery pack case according to the present application; FIG. 7 is a schematic structural view of the mounting bracket in the battery pack case according to the present application; FIG. 8 is a sectional view taken along the line A--A of FIG. 7.Reference Number:100. Battery; 1. case case; 11. buffer cavity; 12. first pressure relief window; 13. side plate; 14. restriction protrusion; 2. top cover plate; 21. second connection protrusion; 3. bottom protection plate; 31. top plate; 311. Pressure relief hole; 312. Second pressure relief window; 313. Weld through hole; 32nd Bottom plate; 321. Receiving recess; 322. First connection fold; 323. Positioning hole; 33th Connecting protrusion; 34th Pressure relief cavity; 35th Restriction recess; 4th Mounting bracket; 41st Placement hole; 42th Insertion protrusion; 5th Pressure relief valve.CONCRETE EMBODIMENTSIn order to reduce undesirable influences of gas resulting from thermal runaway and improve protection and safety of internal components of the battery pack, the present embodiment provides a battery pack box.As shown in FIGS. 1 to 8, the battery pack box includes a box case 1, an upper lid plate 2, a bottom protection plate 3, and at least one pressure relief valve 5. the bottom protection plate 3 includes an upper plate 31, a lower plate 32, and a plurality of connection protrusions 33. the plurality of connection protrusions 33 are spacedly disposed between the upper plate 31 and the lower plate 32 to form a pressure relief cavity 34 between the upper plate 31 and the lower plate 32. The top plate 31 serves to support a plurality of batteries 100, and is provided with pressure relief holes 311 associated with explosion-proof valves on the individual batteries 100 one by one. The pressure relief holes 311 communicate with the pressure relief cavity 34. The bottom protection plate 3 is connected to one side of the box case 1, and inside the box case 1, a buffer cavity 11 communicating with the pressure relief cavity 34 is provided. At least one pressure relief valve 5 is disposed on the case 1 and communicates with the buffer cavity 11, and the top cover plate 2 is connected to the other side of the case 1 and cooperates with the bottom protection plate 3 to form a receiving cavity for receiving the plurality of batteries 100.By providing a plurality of connecting protrusions 33 between the upper plate 31 and the lower plate 32, the pressure relief cavity 34 communicating with the pressure relief holes 311 in the upper plate 31 is formed between the upper plate 31 and the lower plate 32. By providing the box housing 1 with the buffer cavity 11 communicating with the pressure relief cavity 34, and providing the box housing 1 with at least one pressure relief valve 5 communicating with the buffer cavity 11, gas resulting from the thermal runaway enters the respective battery 100 after the respective explosion-proof valve has broken sequentially into the pressure relief cavity 34 and the buffer cavity 11 via the pressure relief holes 311, and is finally discharged via the pressure relief valve 5 connected to the box housing 1. Thus, on the one hand, pressurized gas can be released from the battery 100, and on the other hand, the pressure release path for gas resulting from the thermal runaway is defined to prevent the gas resulting from the thermal runaway from flowing around and damage to internal components caused thereby, and thus achieve good protection capability and high safety.The battery pack box may serve to store the batteries 100 of a plurality of types. In the present exemplary embodiment, it serves primarily for storing large cylindrical batteries. Each of the upper plate 31 and the lower plate 32 is a metal plate. In assembling the floor protection panel 3, first, the plurality of connection protrusions 33 are fixedly connected to provided positions on the lower panel 32 by welding, and then the upper panel 31 is connected to the plurality of connection protrusions 33 by welding, so that the lower panel 32, the connection protrusions 33, and the upper panel 31 are integrally connected, thus increasing the structural strength of the floor protection panel 3.As shown in FIG. 2, the box body 1 includes four side plates 13 connected to each other at the ends. Each of the side plates 13 has the buffer cavity 11 provided therein, and the buffer cavities 11 in the four side plates 13 communicate with each other. At least one of the pressure relief valves 5 is connected to any one of the side plates 13 and communicates with its associated buffer cavity 11. By providing the buffer cavities 11 communicating with each other in the side plates 13 constituting the box body 1, the volume of the buffer cavities 11 is increased and high buffering ability is obtained.As can be seen from FIGS. 2 and 4, a first pressure relief window 12 which communicates with the respective buffer cavity 11 is provided on each of the side plates 13, and second pressure relief windows 312 which are assigned one-to-one to the first pressure relief windows 12 and are connected thereto are provided on the upper plate 31. The second pressure relief windows 312 communicate with the pressure relief cavity 34. By providing the side plates 13 with the first pressure relief windows 12 communicating with the buffer cavities 11 and the upper plate 31 with the second pressure relief windows 312, respectively, the pressure relief cavity 34 is communicated with the buffer cavities 11. In the present embodiment, a first pressure relief window 12 is provided on each of the side plates 13, so that four second pressure relief windows 312 which are uniquely associated with the first pressure relief windows are formed on the upper plate 31. Thus, gas resulting from the thermal runaway flows more quickly into the buffer cavities 11 via the pressure relief cavity 34.As shown in FIGS. 3 and 5, the lower plate 32 is provided with a receiving recess 321 in which the plurality of connection protrusions 33 are disposed. The upper plate 31 is connected to the plurality of connection protrusions 33. The outer periphery of the top plate 31 abuts the wall of the receiving recess 321 to close the receiving recess 321 and form the pressure relief cavity 34. By providing the accommodation recess 321 on the lower plate 32, the placement of the plurality of connection protrusions 33 on the one hand and the formation of the pressure relief cavity 34 together with the upper plate 31 disposed in the accommodation recess 321 on the other hand are facilitated. Further, in the present embodiment, in order to facilitate the determination of the positions of the connection projections 33 in the receiving recess 321, positioning holes 323 located in the receiving recess 321 are formed on the lower plate 32, and the connection projections 33 are fixedly connected to the insides of the respective positioning holes 323.As is apparent from FIG. 5, the lower plate 32 is further provided with a first connecting flange 322 disposed around the receiving recess 321, and the first connecting flange 322 is for connecting to the case case 1, and by providing the first connecting flange 322 to the lower plate 32, the contact area of the bottom protection plate 3 and the case case 1 is increased, thus facilitating, on the one hand, the connection of the bottom protection plate 3 to the case case 1 and, on the other hand, securing sufficient strength of the connection of the case case 1 to the bottom protection plate 3 after the connection is made. In the present embodiment, the first connecting fold 322 may be fixedly connected to the box case 1 by welding or alternatively may be detachably connected to the box case 1 by bolt connection.As shown in FIGS. 1 to 4, the top plate 31 has a first surface facing the batteries 100, and the first connection fold 322 has a second surface facing the case case case 1. The first surface of the upper plate 31 located in the receiving recess 321 is lower than the second surface in terms of the horizontal height to form a restricting recess 35 on the bottom protection plate 3. The case case 1 is provided on a side facing the floor protection panel 3 with a limiting protrusion 14 inserted into the limiting protrusion 35. By forming the restricting recess 35 on the bottom protection plate 3, providing the restricting recess 14 on the case body 1, and inserting the restricting recess 14 into the restricting recess 35, the case body 1 and the bottom protection plate 3 are positioned relative to each other, thereby not only achieving more accurate connection position of the two members but also increasing the structural strength of the case body 1 and the bottom protection plate 3 in the connected state.As can be seen from FIGS. 7 and 8, the battery pack box further includes a mounting bracket 4 provided with a plurality of placement holes 41 for supporting the batteries 100. The placement holes 41 are uniquely associated with and in communication with the pressure relief holes 311. By providing the mounting bracket 4 and forming the placement holes 41 on the mounting bracket 4, the batteries 100 are fixed and limited. Further, the placement holes 41 are uniquely associated with the pressure relief holes 311, thereby ensuring the alignment of the explosion-proof valves of the batteries 100 with the respective pressure relief holes 311. In the present embodiment, the mounting bracket 4 is a plastic bracket and thus has a certain elasticity, thus achieving better compatibility with the batteries 100 and better protection thereof, and avoiding damage to the batteries 100 in the case of a too hard material of the mounting bracket 4.As shown in FIG. 8, the mounting bracket 4 is provided, on a side facing the top plate 31, with insertion protrusions 42 circumferentially arranged around the respective placement holes 41. The insertion protrusions 42 are inserted into the respective pressure relief holes 311. By providing the mounting bracket 4 with fitting recesses 42 circumferentially arranged around the respective placement holes 41 on the side facing the upper plate 31, the mounting bracket 4 is restricted by fitting the fitting recesses 42 into the respective pressure relief holes 311 to prevent the mounting bracket 4 from being displaced relative to the upper plate 31 to cause the batteries 100 to be misaligned and to make it impossible to align the explosion-proof valves with the respective pressure relief holes 311.As is apparent from FIG. 4, in the upper plate 31, a plurality of welding through holes 313 are further formed which are uniquely associated with the plurality of connecting protrusions 33. By providing the welding through holes 313, which are uniquely associated with the plurality of connection protrusions 33, in the upper plate 31, welding of the connection protrusions 33 to the upper plate 31 is facilitated, which provides easier welding work.As shown in FIG. 6, the top cover plate 2 is provided with a second connecting fold 21 for connecting to the box case 1. By providing the second connecting fold 21 on the top cover plate 2, on the one hand, the connection of the top cover plate 2 to the box housing 1 is facilitated and, on the other hand, a sufficient strength of the connection of the box housing 1 to the top cover plate 2 is ensured after the connection has been established. In the present embodiment, the second connecting fold 21 can be fixedly connected to the box housing 1 by welding or alternatively can be detachably connected to the box housing 1 by bolt connection.In the present embodiment, a battery pack including the above-described battery pack box is further provided. By using the above-described battery pack box, the battery pack controls gas resulting from the thermal runaway to avoid damage to the components inside the battery pack due to impact by gas resulting from the thermal runaway, thus enhancing protection for internal components of the battery pack and thus extending the life of the battery pack.

Claims

A battery pack case comprising: a bottom protection plate (3) comprising an upper plate (31), a lower plate (32), and a plurality of connection protrusions (33), the plurality of connection protrusions (33) being spacedly disposed between the upper plate (31) and the lower plate (32) to form a pressure relief cavity (34) between the upper plate (31) and the lower plate (32), the upper plate (31) for supporting a plurality of batteries (100) and being provided with pressure relief holes (311) uniquely associated with explosion protection valves on the individual batteries (100), the pressure relief holes (311) communicating with the pressure relief cavity (34); a box case (1), wherein the bottom protection plate (3) is connected to one side of the box case (1) and a buffer cavity (11) communicating with the pressure relief cavity (34) is provided inside the box case (1); at least one pressure relief valve (5) disposed on the box case (1) and communicating with the buffer cavity (11); an upper lid plate (2) connected to the other side of the box case (1) and cooperating with the bottom protection plate (3) to form a receiving cavity for receiving the plurality of batteries (100).The battery pack case according to claim 1, wherein the case case (1) comprises four side plates (13) connected to each other at the ends, wherein each of the side plates (13) has the buffer cavity (11) provided therein, and the buffer cavities (11) in the four side plates (13) communicate with each other, wherein at least one of the pressure relief valves (5) is connected to and communicates with an associated buffer cavity (11).The battery pack case according to claim 2, wherein each of the side plates (13) is provided with a first pressure relief window (12) communicating with the respective buffer cavity (11), and the top plate (31) is provided with second pressure relief windows (312) uniquely associated with and communicating with the first pressure relief windows (12), the second pressure relief windows (312) communicating with the pressure relief cavity (34).The battery pack case according to claim 3, wherein the lower plate (32) is provided with a receiving recess (321) in which the plurality of connecting protrusions (33) are disposed, the upper plate (31) being connected to the plurality of connecting protrusions (33), the outer periphery of the upper plate (31) abutting against the wall of the receiving recess (321) to close the receiving recess (321) and form the pressure relief cavity (34).The battery pack case according to claim 4, wherein the lower plate (32) is further provided with a first connection fold (322) disposed around the receiving recess (321), the first connection fold (322) for connecting to the case case case (1).The battery pack case according to claim 5, wherein the top plate (31) has a first surface facing the batteries (100), and the first connection fold (322) has a second surface facing the case case (1), wherein the first surface of the top plate (31) located in the receiving recess (321) is lower than the second surface in horizontal height to form a limiting recess (35) on the bottom protection plate (3), wherein the case case (1) is provided with a limiting fold (14) inserted into the limiting recess (35) on a side facing the bottom protection plate (3).The battery pack case according to claim 1, further comprising a mounting bracket (4) provided with a plurality of placement holes (41) for supporting the batteries (100), the placement holes (41) being uniquely associated with and communicating with the pressure relief holes (311).The battery pack case according to claim 7, wherein the fixing bracket (4) is provided, on a side facing the top plate (31), with insertion protrusions (42) circumferentially arranged around the respective placement holes (41), the insertion protrusions (42) being inserted into the respective pressure relief holes (311).The battery pack case according to claim 1, wherein the upper plate (31) further has a plurality of welding through holes (313) uniquely associated with the plurality of connection protrusions (33) formed therein.The battery pack case according to claim 1, wherein a second connecting fold (21) is provided on the top cover plate (2) to be connected to the case case (1).A battery pack comprising a battery pack box according to any one of claims 1 to 10.

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