Battery pack

Abstract

The application discloses a battery pack, which comprises a shell, a module and a flow guide cover. The shell is provided with a pressure relief valve on one side along a first direction. The module is arranged in the shell and comprises a plurality of battery cells arranged along a second direction. Each battery cell is provided with an explosion-proof valve on the side facing the pressure relief valve along the first direction. The first direction is perpendicular to the second direction. The flow guide cover is arranged in the shell and located on the side of the module facing the pressure relief valve along the first direction. The flow guide cover has a flow guide groove and an exhaust hole. The flow guide groove is located on the side of the flow guide cover facing the module and extends along the second direction. The explosion-proof valve of each battery cell is oppositely arranged with the flow guide groove along the first direction. The exhaust hole is in communication with the flow guide groove and oppositely arranged with the pressure relief valve along the first direction. According to the battery pack, the thermal and electrical separation can be realized through the physical isolation mechanism, the secondary discharge phenomenon can be avoided, the possibility of the battery pack on fire can be reduced, and the safety performance can be improved.

Description

Technical Field

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

[0002] In related technologies, during thermal safety testing of energy storage battery packs, blade batteries and cylindrical batteries often use cell explosion-proof valves that are positioned opposite the cell terminals to prevent the high-temperature gases emitted from the cell explosion-proof valves from affecting electrical components such as wiring harnesses and copper / aluminum busbars connected to the cell terminals. However, square lithium iron phosphate batteries mostly use cell explosion-proof valves that are positioned in the same direction as the cell terminals. During battery pack safety testing of square lithium iron phosphate batteries, the high-temperature thermal runaway gases emitted from the cell explosion-proof valves are corrosive, and some of the thermal runaway ejected material may fall back onto electrical components such as wiring harnesses and copper / aluminum busbars connected to the cell terminals, causing short circuits or arcing discharges in the wiring harnesses, which in turn can lead to a fire in the battery pack. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a battery pack that can effectively separate thermal runaway ejecta from electrical components through a physical isolation mechanism, avoiding secondary discharge phenomena such as wiring harness short circuits or arcing, reducing the possibility of battery pack fire, and improving the safety performance of the battery pack.

[0004] According to an embodiment of the present invention, a battery pack includes: a housing, wherein a pressure relief valve is provided on one side of the housing along a first direction; a module, wherein the module is disposed within the housing and includes a plurality of battery cells arranged along a second direction, wherein an explosion-proof valve is provided on the side of the battery cells facing the pressure relief valve along the first direction, the first direction being perpendicular to the second direction; and a flow guide, wherein the flow guide is disposed within the housing and is located on the side of the module facing the pressure relief valve along the first direction, the flow guide having a flow guide groove and an exhaust port, the flow guide groove being located on the side of the flow guide shroud facing the module and extending along the second direction, wherein the explosion-proof valve of each battery cell of the module is disposed opposite to the flow guide groove in the first direction, and the exhaust port is connected to the flow guide groove and disposed opposite to the pressure relief valve in the first direction.

[0005] According to embodiments of the present invention, the battery pack is equipped with a flow guide shroud, and the flow guide shroud is provided with flow guide grooves opposite to the explosion-proof valves of multiple battery cells. This allows for the directional discharge of thermal runaway gas from the battery pack. Through a physical isolation mechanism, the thermal runaway ejected material can be effectively separated from electrical components, avoiding secondary discharge phenomena such as short circuits or arcing caused by the thermal runaway ejected material. This reduces the possibility of battery pack fire, significantly improves the pass rate of battery pack thermal safety tests, enhances the safety performance of the battery pack, and provides a necessary safety guarantee foundation for subsequent higher energy density battery systems.

[0006] In addition, the battery pack according to the present invention may also have the following additional technical features: In some embodiments, the flow guide includes a plate body and a flow guide ring, the flow guide ring being connected to the side of the plate body facing the module, and the flow guide ring defining the flow guide groove.

[0007] In some embodiments, the flow guide is a one-piece molded part; and / or, the flow guide is an SMC part; and / or, the two ends of the flow guide along the second direction are fixed to the end plate of the module.

[0008] In some embodiments, the battery pack further includes a CCS bracket, which is disposed within the housing and located between the module and the air guide. The CCS bracket extends along the second direction and has a plurality of clearance holes, which are respectively configured to correspond to the explosion-proof valves of the plurality of battery cells.

[0009] In some embodiments, the CCS bracket has a plurality of guide protrusions on the side facing the flow guide cover, and the plurality of guide protrusions correspond one-to-one with the plurality of clearance holes. The guide protrusions surround the clearance holes, and at least a portion of the guide protrusions extends into the flow guide groove. The end face of the guide protrusions facing away from the module is spaced apart from the wall surface of the flow guide groove away from the module.

[0010] In some embodiments, the guide protrusion has a locking hole, and the inner wall of the flow channel has a plurality of locking protrusions that correspond one-to-one with and cooperate with the plurality of locking holes.

[0011] In some embodiments, each of the guide protrusions has a locking hole on both walls along a third direction, the third direction being perpendicular to the first direction and the second direction; and / or, in the direction from the fixed end to the free end of the locking protrusion, the side surface of the locking protrusion facing the module is inclined in a direction away from the module.

[0012] In some embodiments, the housing has a mounting hole, which is disposed opposite to the vent hole. The pressure relief valve includes: a valve body, which passes through the mounting hole and the vent hole, and has a guide hole that extends through the valve body along the axial direction of the mounting hole; and a valve cover, which is disposed on the valve body to block the guide hole, and the valve cover and the valve body have an attractive force between them.

[0013] In some embodiments, a first sealing ring is provided between the outer peripheral wall of the valve body and the inner peripheral wall of the exhaust port, the first sealing ring extending along the circumferential direction of the exhaust port; and / or, a second sealing ring is provided between the valve body and the housing, the second sealing ring surrounding the mounting hole.

[0014] In some embodiments, the modules are multiple modules arranged along a third direction, and the guide groove, the exhaust port and the pressure relief valve are multiple modules that correspond one-to-one with the multiple modules. The third direction is perpendicular to the first direction and the second direction.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of a battery pack according to an embodiment of the present invention; Figure 2 This is a top view of a battery pack according to an embodiment of the present invention; Figure 3 It is along Figure 2 Sectional view of line AA in the middle; Figure 4 yes Figure 3 Enlarged view of point B in the middle; Figure 5 This is a perspective view of a battery pack according to an embodiment of the present invention, wherein the cover and the air deflector are not shown; Figure 6 yes Figure 5 Enlarged view of point C in the middle; Figure 7 This is a perspective view of the air guide cover of the battery pack according to an embodiment of the present invention; Figure 8 yes Figure 7 Enlarged view of point D in the middle; Figure 9 This is a bottom view of the fairing of the battery pack according to an embodiment of the present invention; Figure 10 yes Figure 9 Enlarged view at point E in the middle; Figure 11 This is a perspective view of the pressure relief valve of the battery pack according to an embodiment of the present invention; Figure 12 This is a perspective view of the pressure relief valve of the battery pack according to an embodiment of the present invention from another angle; Figure 13This is a left view of the pressure relief valve of the battery pack according to an embodiment of the present invention; Figure 14 It is along Figure 13 A cross-sectional view of the FF line.

[0017] Figure label: 100. Battery pack; 1. Housing; 11. Box body; 12. Box cover; 13. Pressure relief valve; 131. Valve body; 1311. Guide hole; 1312. Valve seat; 1313. Guide section; 1314. Weight reduction hole; 132. Valve cover; 14. Mounting hole; 15. First sealing ring; 16. Second sealing ring; 2. Module; 21. Battery cell; 22. Explosion-proof valve; 3. Draft shield; 31. Plate body; 32. Draft guide ring; 33. Draft guide groove; 331. Draft protrusion; 34. Exhaust port; 4. CCS bracket; 41. Clearance hole; 42. Guide protrusion; 421. Locking hole; 43. Connecting piece. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] A battery pack 100 according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0023] like Figure 1 , Figure 3 and Figure 4 As shown, the battery pack 100 according to an embodiment of the present invention includes a housing 1, a module 2, and a flow guide 3.

[0024] Specifically, see the attached document. Figure 1 Appendix Figure 2 and attached Figure 3 As shown, housing 1 is along the first direction (e.g.) Figure 1 A pressure relief valve 13 is provided on one side of the housing 1 (as shown). The pressure relief valve 13 is used to discharge the thermal runaway gas inside the housing 1. The module 2 is disposed inside the housing 1 and includes components along the second direction (such as...). Figure 3 As shown, multiple battery cells 21 are arranged in a row. Each battery cell 21 is provided with an explosion-proof valve 22 on the side of the battery cell 21 facing the pressure relief valve 13 along the first direction. The first direction is perpendicular to the second direction. When the battery cell 21 experiences thermal runaway, the high temperature, conductive and corrosive ejected material generated by the thermal runaway can be discharged into the housing 1 through the explosion-proof valve 22.

[0025] Further, see attached document. Figure 4 As shown, in conjunction with the reference appendix Figure 7 and attached Figure 9 The flow guide shroud 3 is disposed inside the housing 1, and the flow guide shroud 3 is located on the side of the module 2 facing the pressure relief valve 13 along the first direction. The flow guide shroud 3 has a flow guide groove 33 and an exhaust port 34. The flow guide groove 33 is located on the side of the flow guide shroud 3 facing the module 2, and the flow guide groove 33 extends along the second direction. The explosion-proof valve 22 of each cell 21 of the module 2 is arranged opposite to the flow guide groove 33 in the first direction. The exhaust port 34 is connected to the flow guide groove 33 and is arranged opposite to the pressure relief valve 13 in the first direction.

[0026] Understandably, during the thermal safety test of the battery pack 100, the high-temperature and high-pressure gas generated by the thermal runaway of the cell 21 can be discharged into the guide channel 33 through the explosion-proof valve 22. The thermal runaway gas gathers in the guide channel 33, flows along the guide channel 33 to the exhaust port 34, and is discharged from the pressure relief valve 13 to the outside of the battery pack 100 through the exhaust port 34.

[0027] In related technologies, during thermal safety testing of energy storage battery packs, the high-temperature, conductive, and corrosive ejecta generated by thermal runaway of the battery cells can damage the insulation protection sleeves of high and low voltage electrical components, causing secondary discharge phenomena such as short circuits or arcing of wiring harnesses, which in turn can form ignition points and lead to fires.

[0028] This application, by providing a flow guide shroud 3 and a flow guide groove 33 on the flow guide shroud 3 that is opposite to the explosion-proof valve 22 of multiple battery cells 21, directs the thermal runaway gas of the battery pack 100 to be discharged. It can effectively separate the thermal runaway ejected material from the electrical components through a physical isolation mechanism, avoid secondary discharge phenomena such as short circuits or arcing caused by the thermal runaway ejected material, thereby reducing the possibility of the battery pack 100 catching fire, significantly improving the thermal safety test pass rate of the battery pack 100, improving the safety performance of the battery pack 100, and providing the necessary safety guarantee foundation for subsequent higher energy density battery systems.

[0029] It should be noted that the battery cell 21 in this application is a square-shell battery cell, and the module 2 is a 1P26S module. The terminals and explosion-proof valves 22 of the battery cell 21 are both located on the side of the battery cell 21 facing the pressure relief valve 13 along the first direction. On the projection plane perpendicular to the first direction, the explosion-proof valves 22 of each battery cell 21 are located inside the flow guide groove 33, and the terminals are located outside the flow guide groove 33. The explosion-proof valves 22 and terminals of the battery cell 21 can be separated by the flow guide cover 3 to achieve thermoelectric separation.

[0030] According to an embodiment of the present invention, the battery pack 100 is provided with a flow guide shroud 3 and a flow guide groove 33 on the flow guide shroud 3 opposite to the explosion-proof valves 22 of the multiple battery cells 21. This allows for the directional discharge of thermal runaway gas from the battery pack 100. Through a physical isolation mechanism, the thermal runaway ejected material can be effectively separated from electrical components, avoiding secondary discharge phenomena such as short circuits or arcing caused by the thermal runaway ejected material. This reduces the possibility of the battery pack 100 catching fire, significantly improves the thermal safety test pass rate of the battery pack 100, enhances the safety performance of the battery pack 100, and provides a necessary safety guarantee foundation for subsequent higher energy density battery systems.

[0031] In some embodiments of the present invention, reference is made to the appendix. Figure 4 and attached Figure 7 As shown, the flow guide shroud 3 includes a plate body 31 and a flow guide ring 32. The plate body 31 can protect the module 2, connecting piece 43, wire harness, etc. from the side of the module 2 facing the pressure relief valve 13. The flow guide ring 32 is connected to the side of the plate body 31 facing the module 2. The flow guide ring 32 defines a flow guide groove 33. The flow guide groove 33 can be defined with as little material as possible, which can reduce the material usage of the flow guide shroud 3 and reduce the manufacturing cost of the flow guide shroud 3.

[0032] Optionally, the thickness of the plate body 31 in the first direction is 2mm-4mm. The uniform thickness of the plate body 31 can minimize the amount of the flow guide 3 used while meeting the requirements, thereby reducing the manufacturing cost of the flow guide 3. The thickness of the flow guide ring 32 in the first direction can be specifically designed according to the total height of the battery pack 100, and no further restrictions are imposed here.

[0033] In some embodiments of the present invention, reference is made to the appendix. Figure 7 As shown, the fairing 3 is an integrally molded part. The fairing 3 is molded by high temperature and high pressure, which can reduce the number of parts of the battery pack 100, simplify the assembly process of the battery pack 100, and reduce the assembly difficulty of the battery pack 100.

[0034] In some embodiments of the present invention, the air guide 3 is an SMC (Sheet Molding Compound) part. SMC composite material is a sheet thermosetting material composed of unsaturated polyester resin, glass fiber, filler and various additives. It has the characteristics of being lightweight and high-strength, resistant to chemical corrosion, heat-resistant, flame-retardant and electrically insulating. By making the air guide 3 an SMC part, the air guide 3 covers the module 2, which can realize the insulation between the connecting piece 43, wire harness and the metal box cover 12, and ensure the safety performance of the battery pack 100.

[0035] In some embodiments of the present invention, the two ends of the flow guide 3 along the second direction are fixed to the end plate of the module 2, which can realize the installation and fixation of the flow guide 3, prevent the flow guide 3 from falling off due to the impact of thermal runaway gas after assembly, ensure the stability of the flow guide 3, and improve the reliability of the battery pack 100.

[0036] In some embodiments of the present invention, reference is made to the appendix. Figure 5 and attached Figure 6 As shown, the battery pack 100 also includes a CCS (Cell Connection System) bracket 4. The CCS bracket 4 is located inside the housing 1 and between the module 2 and the flow guide 3. The CCS bracket 4 extends along the second direction and has multiple clearance holes 41. The multiple clearance holes 41 are configured to correspond one-to-one with the explosion-proof valves 22 of the multiple cells 21.

[0037] It should be noted that the CCS integrated wiring harness with connecting piece 43 is connected to the terminal of each battery cell 21 by laser welding. The CCS bracket 4 is an injection molded part used to fix the battery cell 21, support the connecting piece 43 and the CCS integrated wiring harness, and also serves as insulation. By providing a clearance hole 41 on the CCS bracket 4, it can be used to avoid the explosion-proof valve 22. In the event of thermal runaway of the battery cell 21, the thermal runaway ejected material can be smoothly ejected from the explosion-proof valve 22 and enter the guide groove 33 through the clearance hole 41, thus achieving normal discharge of the thermal runaway ejected material.

[0038] In a further embodiment of the invention, reference is made to the appendix. Figure 5 and attached Figure 6 As shown, the CCS bracket 4 has multiple guide protrusions 42 on the side facing the flow guide shroud 3. The multiple guide protrusions 42 correspond one-to-one with multiple clearance holes 41. The guide protrusions 42 surround the clearance holes 41. At least a portion of the guide protrusions 42 extends into the flow guide groove 33, and the end face of the guide protrusions 42 facing away from the module 2 is spaced apart from the wall surface of the flow guide groove 33 away from the module 2.

[0039] Understandably, when thermal runaway occurs in cell 21, the thermal runaway ejected material is ejected from the explosion-proof valve 22 and enters the guide protrusion 42. The guide protrusion 42 can guide the thermal runaway ejected material, allowing it to flow directly into the guide channel 33 in the first direction and then flow along the guide channel 33 towards the exhaust port 34. Furthermore, since one guide channel 33 is connected to multiple clearance holes 41 simultaneously, the presence of the guide protrusion 42 can reduce the possibility of the thermal runaway ejected material in the guide channel 33 flowing to the clearance holes 41 of other non-runaway cells 21, thereby improving the safety of the battery pack 100 to a certain extent.

[0040] By separating the end face of the guide protrusion 42 away from the module 2 from the wall face of the guide groove 33 away from the module 2, it can be ensured that the thermal runaway ejected material in the guide protrusion 42 can enter the guide groove 33, avoiding the accumulation of a large amount of thermal runaway ejected material in the guide protrusion 42, which can improve the safety of the battery pack 100 to a certain extent.

[0041] In a further embodiment of the invention, in conjunction with reference to the appendix... Figure 6 and attached Figure 8 As shown, the guide protrusion 42 has a locking hole 421, and the inner wall of the flow channel 33 has a plurality of locking protrusions 331 that correspond one-to-one with and cooperate with the multiple locking holes 421. Through the cooperation of the locking holes 421 and the locking protrusions 331, the fixed connection between the flow guide 3 and the CCS bracket 4 can be realized, so as to prevent the flow guide 3 from falling off due to the impact of thermal runaway gas after assembly, thus ensuring the stability of the flow guide 3 and improving the reliability of the battery pack 100.

[0042] Furthermore, the engagement method of the card hole 421 and the card protrusion 331 is simple in structure and easy to install. It can realize the detachable connection between the fairing 3 and the CCS bracket 4, reduce the assembly and disassembly difficulty between the fairing 3 and the CCS bracket 4, shorten the assembly and disassembly time between the fairing 3 and the CCS bracket 4, and reduce the assembly and maintenance costs between the fairing 3 and the CCS bracket 4.

[0043] Furthermore, since each cell 21 in the same module 2 corresponds to a guide protrusion 42, and each guide protrusion 42 has a locking hole 421, it can cooperate with the locking protrusion 331 of the guide shroud 3 at multiple intervals along the second direction, thereby realizing multiple cooperation between the guide shroud 3 and the CCS bracket 4, further improving the reliability of the connection between the guide shroud 3 and the CCS bracket 4, preventing the guide shroud 3 from coming off due to the impact of thermal runaway gas after assembly, ensuring the installation stability of the guide shroud 3, and improving the reliability of the battery pack 100.

[0044] In a further embodiment of the invention, in conjunction with reference to the appendix... Figure 6 and attached Figure 10 As shown, each guide protrusion 42 is along a third direction (e.g. Figure 10 The guide duct 33 has a locking hole 421 on both walls, with the third direction perpendicular to the first and second directions. This allows the guide duct 33 to engage with the guide protrusion 42 on both walls along the third direction. This enables the guide protrusion 42 to engage with the guide duct 3 from both sides along the third direction, further improving the reliability of the connection between the guide duct 3 and the CCS bracket 4. This prevents the guide duct 3 from coming off due to the impact of thermal runaway gas after assembly, ensuring the installation stability of the guide duct 3 and improving the reliability of the battery pack 100.

[0045] In a further embodiment of the invention, reference is made to the appendix. Figure 8 As shown, in the direction from the fixed end to the free end of the protrusion 331, the surface of the protrusion 331 facing the module 2 is inclined away from the module 2. When the flow guide 3 is assembled onto the CCS bracket 4, the inclined surface of the protrusion 331 can play a guiding role, which facilitates the cooperation between the protrusion 331 and the hole 421, reduces the difficulty of the connection between the flow guide 3 and the guide protrusion 42, and ensures the smooth connection between the flow guide 3 and the CCS bracket 4.

[0046] In some embodiments of the present invention, reference is made to the appendix. Figure 4 As shown, in conjunction with the reference appendix Figure 11 Appendix Figure 12 Appendix Figure 13 and attached Figure 14The housing 1 has a mounting hole 14, which is opposite to the vent hole 34. The pressure relief valve 13 includes a valve body 131 and a valve cover 132. The valve body 131 passes through the mounting hole 14 and the vent hole 34. The valve body 131 has a guide hole 1311, which is along the axial direction of the mounting hole 14 (see attached figure). Figure 4 The valve body 131 is penetrated in the first direction shown. The valve cover 132 is placed on the valve body 131 to block the guide hole 1311. There is an attraction between the valve cover 132 and the valve body 131.

[0047] Understandably, under normal operating conditions, the attraction between the valve cover 132 and the valve body 131 causes the valve cover 132 to be tightly sealed onto the valve body 131, blocking the guide hole 1311 of the valve body 131. When thermal runaway occurs in the battery pack 100, the internal pressure of the battery pack 100 increases, and the pressure overcomes the attraction between the valve cover 132 and the valve body 131, causing the valve cover 132 to be pushed open. The thermal runaway gas inside the battery pack 100 can then be discharged to the outside of the battery pack 100 through the guide hole 1311. When the internal pressure of the battery pack 100 decreases, the attraction between the valve cover 132 and the valve body 131 pulls the valve cover 132 back to the closed state, and the valve cover 132 blocks the guide hole 1311 again.

[0048] It should be noted that the pressure relief valve 13 is a magnetic explosion-proof valve. Magnets are installed in both the valve body 131 and the valve cover 132. Except for the magnets, the parts of the valve body 131 and the valve cover 132 are made of aluminum alloy. The magnetic force of the magnetic explosion-proof valve is stable, which can improve the reliability and stability of the pressure relief valve 13, ensure that the battery pack 100 still has the pressure relief function after long-term use, and extend the service life of the battery pack 100.

[0049] Specifically, such as Figure 1 and Figure 4 As shown, the housing 1 includes a box body 11 and a box cover 12 connected to each other. The module 2, the flow guide 3, the CCS bracket 4, etc. are all located inside the box body 11. The box body 11 is open on one side along the first direction. The box cover 12 is placed on the open side of the box body 11. The mounting hole 14 is provided on the box cover 12. The valve body 131 is detachably connected to the box cover 12.

[0050] Furthermore, the cover 12 is made of SGCC (hot-dip galvanized steel sheet), which has high hardness and good corrosion resistance, ensuring the reliability and stability of the cover 12. The thickness of the cover 12 can be adjusted appropriately based on cost considerations. In a specific example, the cover 12 is 0.8mm thick. Due to the thinness of the cover 12, a screw and nut locking method is required to fix the pressure relief valve 13 to the cover 12.

[0051] Furthermore, see the attached document. Figure 4 Appendix Figure 11 and attached Figure 12 As shown, the valve body 131 includes a valve seat 1312 and a guide section 1313. The guide section 1313 passes through the mounting hole 14 and the vent hole 34. The guide hole 1311 is formed on the guide section 1313 and passes through the guide section 1313. The valve seat 1312 is sleeved on the outside of the guide section 1313. The valve seat 1312 is located on the side of the cover 12 away from the cover 11 and is connected to the cover 12 by fasteners.

[0052] Preferably, such as Figure 12 As shown, the valve seat 1312 is provided with a weight reduction hole 1314. The weight reduction hole 1314 is located on the radial outer side of the guide section 1313 and extends along the circumferential direction of the guide section 1313. There are multiple weight reduction holes 1314, which are spaced apart in the circumferential direction of the guide section 1313. The setting of the weight reduction hole 1314 can reduce the weight of the pressure relief valve 13 as much as possible without affecting the normal discharge of thermal runaway gas, which is beneficial to the lightweight design of the battery pack 100.

[0053] In a further embodiment of the invention, reference is made to the appendix. Figure 12 and attached Figure 14 As shown, in conjunction with the reference appendix Figure 4 A first sealing ring 15 is provided between the outer peripheral wall of the valve body 131 and the inner peripheral wall of the exhaust port 34. The first sealing ring 15 extends along the circumferential direction of the exhaust port 34. The first sealing ring 15 can ensure the sealing between the outer peripheral wall of the valve body 131 and the inner peripheral wall of the exhaust port 34, preventing thermal runaway gas from flowing from the gap between the outer peripheral wall of the valve body 131 and the inner peripheral wall of the exhaust port 34 to the side of the guide shroud 3 away from the module 2. This ensures that the thermal runaway gas can be discharged directly to the outside of the housing 1 through the guide hole 1311 according to the planned path, preventing the accumulation of a large amount of thermal runaway gas in the battery pack 100 and ensuring the safety performance of the battery pack 100. Optionally, the first sealing ring 15 is a fluororubber sealing ring.

[0054] In a further embodiment of the invention, reference is made to the appendix. Figure 12 and attached Figure 14 As shown, in conjunction with the reference appendix Figure 4 A second sealing ring 16 is provided between the valve body 131 and the housing 1, surrounding the mounting hole 14. The second sealing ring 16 ensures the sealing between the valve body 131 and the housing 1, preventing thermal runaway gas from flowing out from the gap between the valve body 131 and the housing 1, and ensuring that thermal runaway gas can flow out from the pressure relief valve 13, thus ensuring the safety performance of the battery pack 100. Optionally, the second sealing ring 16 is a fluororubber sealing ring.

[0055] Specifically, such as Figure 4As shown, the valve body 131 includes a valve seat 1312 and a guide section 1313. The guide section 1313 passes through the mounting hole 14 and the vent hole 34. A guide hole 1311 is formed on and passes through the guide section 1313. The valve seat 1312 is sleeved on the outside of the guide section 1313. The valve seat 1312 is located on the side of the cover 12 opposite to the housing 11 and is connected to the cover 12 by fasteners. The second sealing ring 16 is disposed between the surface of the cover 12 opposite to the housing 11 and the surface of the valve seat 1312 facing the cover 12. Of course, this application is not limited to this. The second sealing ring 16 may also be disposed between the outer peripheral wall of the valve body 131 and the inner peripheral wall of the mounting hole 14.

[0056] In some embodiments of the present invention, in conjunction with reference to the appendix Figure 1 and attached Figure 5 As shown, multiple modules 2 are arranged along a third direction. The guide grooves 33, vent holes 34, and pressure relief valves 13 are all corresponding to multiple modules 2. The third direction is perpendicular to the first and second directions. The arrangement of multiple modules 2 can increase the energy storage capacity of the battery pack 100. Multiple cells 21 within the same module 2 correspond to the same guide groove 33. Each guide groove 33 is connected to a vent hole 34. The housing 1 is provided with pressure relief valves 13 corresponding to and connected to the multiple vent holes 34, making the venting paths of the multiple modules 2 independent, reducing thermal runaway interference between modules 2, and minimizing the impact of thermal runaway on the remaining cells 21. For example, the number of modules 2 can be two, three, four, or five, and the guide grooves 33, vent holes 34, and pressure relief valves 13 are all corresponding to multiple modules 2 in two, three, four, or five ways.

[0057] In a specific example, referring to the appendix Figure 1 and attached Figure 7 As shown, there are four modules 2 arranged along the third direction. The flow guide 3 includes a plate body 31 and four flow guide protrusions 32. Each flow guide protrusion 32 defines a flow guide groove 33. The flow guide grooves 33 correspond one-to-one with the modules 2. The flow guide 3 is provided with four exhaust holes 34, and the housing 1 is provided with four pressure relief valves 13.

[0058] Other configurations and operations of the battery pack 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions 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 one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: Housing (1), wherein a pressure relief valve (13) is provided on one side along the first direction; Module (2), the module (2) is disposed in the housing (1) and includes a plurality of battery cells (21) arranged along the second direction, the battery cells (21) are provided with an explosion-proof valve (22) on the side of the pressure relief valve (13) along the first direction, the first direction and the second direction are perpendicular to each other; A flow guide (3) is disposed inside the housing (1) and the flow guide (3) is located on the side of the module (2) facing the pressure relief valve (13) along the first direction. The flow guide (3) has a flow guide groove (33) and an exhaust port (34). The flow guide groove (33) is located on the side of the flow guide (3) facing the module (2) and the flow guide groove (33) extends along the second direction. The explosion-proof valve (22) of each cell (21) of the module (2) is disposed opposite to the flow guide groove (33) in the first direction. The exhaust port (34) communicates with the flow guide groove (33) and is disposed opposite to the pressure relief valve (13) in the first direction.

2. The battery pack according to claim 1, characterized in that, The flow guide shroud (3) includes a plate body (31) and a flow guide ring (32). The flow guide ring (32) is connected to the side of the plate body (31) facing the module (2), and the flow guide groove (33) is defined inside the flow guide ring (32).

3. The battery pack according to claim 1, characterized in that, The flow guide (3) is a one-piece molded part; And / or, the flow deflector (3) is an SMC component; And / or, the two ends of the flow guide (3) along the second direction are fixed to the end plate of the module (2).

4. The battery pack according to claim 1, characterized in that, Also includes: CCS bracket (4) is disposed inside the housing (1) and is located between the module (2) and the flow guide (3). The CCS bracket (4) extends along the second direction and has a plurality of clearance holes (41). The plurality of clearance holes (41) are corresponding to the explosion-proof valves (22) of the plurality of cells (21).

5. The battery pack according to claim 4, characterized in that, The CCS bracket (4) has a plurality of guide protrusions (42) on the side facing the flow guide (3). The plurality of guide protrusions (42) correspond one-to-one with the plurality of clearance holes (41). The guide protrusions (42) surround the clearance holes (41). At least a portion of the guide protrusions (42) extends into the flow guide groove (33), and the end face of the guide protrusions (42) facing away from the module (2) is spaced apart from the wall surface of the flow guide groove (33) away from the module (2).

6. The battery pack according to claim 5, characterized in that, The guide protrusion (42) has a locking hole (421), and the inner wall of the flow channel (33) has a plurality of locking protrusions (331) that correspond one-to-one with and cooperate with the plurality of locking holes (421).

7. The battery pack according to claim 6, characterized in that, Each of the guide protrusions (42) has a locking hole (421) on both walls along a third direction, the third direction being perpendicular to the first direction and the second direction; And / or, in the direction from the fixed end to the free end of the protrusion (331), the side surface of the protrusion (331) facing the module (2) is inclined in a direction away from the module (2).

8. The battery pack according to claim 1, characterized in that, The housing (1) has a mounting hole (14) which is opposite to the vent hole (34). The pressure relief valve (13) includes: A valve body (131) is provided in the mounting hole (14) and the exhaust hole (34). The valve body (131) has a guide hole (1311) which passes through the valve body (131) along the axial direction of the mounting hole (14). A valve cover (132) is disposed on the valve body (131) for sealing the guide hole (1311), and there is an attraction between the valve cover (132) and the valve body (131).

9. The battery pack according to claim 8, characterized in that, A first sealing ring (15) is provided between the outer peripheral wall of the valve body (131) and the inner peripheral wall of the exhaust hole (34), and the first sealing ring (15) extends along the circumferential direction of the exhaust hole (34). And / or, a second sealing ring (16) is provided between the valve body (131) and the housing (1), the second sealing ring (16) surrounding the mounting hole (14).

10. The battery pack according to any one of claims 1-9, characterized in that, The module (2) consists of multiple units arranged along a third direction. The guide groove (33), the exhaust port (34), and the pressure relief valve (13) are all multiple units corresponding to the multiple modules (2). The third direction is perpendicular to the first direction and the second direction.

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