Thermal runaway prevention and control device, battery pack and electric equipment

Abstract

The application provides a thermal runaway prevention and control device, a battery pack and an electric device. The thermal runaway prevention and control device is suitable for being installed in a shell of the battery pack, and comprises a shell and a gas generation assembly. The shell has a containing cavity and a first communication hole in communication with the containing cavity. The gas generation assembly is arranged in the containing cavity and is suitable for being triggered to form inert gas when the battery pack is in a preset condition. The inert gas enters the shell of the battery pack through the first communication hole to dilute and / or flame-retardant thermal runaway products in the shell. The application can reduce or even avoid the risk of deflagration of the thermal runaway products, and improves the safety performance of the battery pack.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of energy storage, and in particular to a thermal runaway prevention and control device, a battery pack and an electrical equipment. BACKGROUND

[0002] With the wide application of new energy vehicles, batteries are widely used in new energy vehicles as power output devices. However, the thermal stability problem of the battery is increasingly prominent, which is easy to form thermal runaway. During the thermal runaway process, thermal runaway products (for example, high-temperature combustible gas and / or flame) will accumulate inside the battery. The thermal runaway products are released into the box of the battery pack through the explosion-proof valve of the battery.

[0003] However, the thermal runaway products will accumulate in the shell of the battery pack, greatly increasing the possibility of deflagration and reducing the safety performance of the battery pack. SUMMARY

[0004] In view of the above problems, embodiments of the present application provide a thermal runaway prevention and control device, a battery pack and an electrical equipment, which can reduce or even avoid the risk of deflagration of thermal runaway products and improve the safety performance of the battery pack.

[0005] To achieve the above-mentioned purpose, embodiments of the present application provide the following technical solutions:

[0006] In a first aspect, embodiments of the present application provide a thermal runaway prevention and control device adapted to be installed in the shell of a battery pack, comprising:

[0007] a shell, the shell having a containing chamber and a first communication hole in communication with the containing chamber;

[0008] a gas generating assembly, the gas generating assembly being arranged in the containing chamber and being adapted to be triggered to form inert gas when the battery pack is in a preset condition; wherein the inert gas enters the shell of the battery pack through the first communication hole to dilute and / or extinguish the thermal runaway products in the shell.

[0009] In a possible implementation, the gas generating assembly is arranged on the inner wall of the shell.

[0010] In a possible implementation, the thermal runaway prevention and control device further comprises a support, the support being connected with the shell and located in the containing chamber.

[0011] In the thickness direction of the support, the gas generating assembly is arranged on at least one side of the support.

[0012] In a possible implementation, the support member has a circuit slot and a notch in communication with the circuit slot, the circuit slot is adapted to allow a connection harness to pass therethrough, and one end of the connection harness is electrically connected to the gas generating assembly through the notch.

[0013] In a possible implementation, the support member is further provided with a plurality of fifth communication holes for communicating the accommodating cavities on both sides of the support member.

[0014] In a possible implementation, the gas generating assembly comprises a main body and a gas generating agent heating portion, the main body has a reaction chamber and a second communication hole in communication with the reaction chamber, and the reaction chamber has a gas generating agent therein;

[0015] The gas generating agent heating portion is arranged in the reaction chamber and in contact with the gas generating agent;

[0016] When the battery pack is in a preset condition, the heating portion is triggered to generate heat, so that the gas generating agent generates inert gas at a preset temperature.

[0017] In a possible implementation, two ends of the heating portion are connected to the inner wall of the main body and pass through the gas generating agent.

[0018] In a possible implementation, the gas generating agent comprises nitro guanidine or guanidine nitrate, or the gas generating agent comprises cyclotrimethylene trinitramine.

[0019] In a possible implementation, the gas generating assembly further comprises a protective cover, the protective cover is arranged outside the main body and connected to the main body;

[0020] The protective cover is provided with a third communication hole for communicating the area between the protective cover and the main body with the accommodating cavities.

[0021] In a possible implementation, the gas generating assembly further comprises a constraint member, the constraint member is arranged between the protective cover and the main body and connected to the protective cover and the main body respectively.

[0022] In a possible implementation, the constraint member comprises an arc-shaped portion, a first folded portion and a second folded portion; in the direction in which the protective cover points to the main body, the first folded portion and the second folded portion are connected to two ends of the arc-shaped portion respectively and extend in the direction away from the center of the arc-shaped portion;

[0023] The first folded portion is connected to the main body, and the second folded portion is connected to the protective cover.

[0024] In a possible implementation, the gas generating assembly further comprises a fairing, the fairing is sleeved on the protective cover, and a plurality of fourth communication holes are arranged on the fairing in a spaced manner.

[0025] In a possible implementation, the shell comprises a frame body, a first end plate and a second end plate, the frame body has two ends open in the thickness direction of the frame body, and the first end plate and the second end plate are connected with the frame body and cover the corresponding openings respectively.

[0026] The first communication holes are arranged on the frame body.

[0027] In a possible implementation, the frame body is a rectangular frame body, and the number of the first communication holes comprises a plurality.

[0028] The frame body comprises a first side plate and a second side plate arranged oppositely along the length direction of the frame body, a part of the first communication holes are arranged on the first side plate, and the remaining first communication holes are arranged on the second side plate.

[0029] In a possible implementation, at least one of the first side plate and the second side plate is provided with a reinforcing chamber, and a reinforcing plate is arranged in the reinforcing chamber.

[0030] In a possible implementation, the reinforcing plate comprises a reinforcing frame and a plurality of reinforcing ribs arranged in the reinforcing frame, and the reinforcing ribs are arranged in sequence in the thickness direction of the frame body.

[0031] Each of the reinforcing ribs comprises a plurality of arc segments connected with each other, and the arc segment of one of the reinforcing ribs is located between the two arc segments of the other reinforcing rib.

[0032] In a possible implementation, the shell further comprises at least one protective plate, the at least one protective plate is arranged on at least one side of the frame body in the width direction, and the at least one protective plate and the frame body form a protective cavity.

[0033] The protective cavity is provided with buffer foam.

[0034] In a second aspect, the embodiments of the present application provide a battery pack, comprising a battery cell group and the thermal runaway prevention and control device of the first aspect, the battery cell group comprises a plurality of battery cells arranged in sequence in a first direction.

[0035] The thermal runaway prevention and control device is located on at least one side of the battery cell group in the first direction and is arranged in close contact with the battery cell group, or one thermal runaway prevention and control device is arranged between at least two adjacent battery cells.

[0036] In a possible implementation, the thermal runaway prevention and control device comprises a frame and a first communication hole arranged on the frame, the first communication hole being used for the inert gas generated by the thermal runaway prevention and control device to pass through.

[0037] The side plate where the first communication hole is located intersects the first direction.

[0038] In a possible implementation, the battery pack further comprises a shell and a pressure relief channel, the shell comprises a bottom plate and at least two side beams, the at least two side beams are arranged along the first direction and connected with the bottom plate to enclose a cavity, and the cavity is adapted to accommodate the group of battery cells.

[0039] The pressure relief channel is arranged on the shell and communicates the cavity with an external space.

[0040] In a possible implementation, the battery pack further comprises a controller and a detection component connected with the controller, the detection component is adapted to detect a parameter in the shell, and the detection component comprises at least one of a temperature sensor, a gas sensor and a pressure sensor.

[0041] The controller is further connected with the gas generating assembly, and is used to control the working state of the gas generating assembly according to the parameter.

[0042] In a third aspect, the embodiments of the present application provide a power consumption device, which comprises a power consumption apparatus and the battery pack of the second aspect, the battery pack is electrically connected with the power consumption apparatus, and is used to provide electric energy for the power consumption apparatus.

[0043] In the thermal runaway prevention and control device, the battery pack and the power consumption device provided in the embodiments of the present application, the thermal runaway prevention and control device is arranged in the shell of the battery pack, the thermal runaway prevention and control device comprises a shell and a gas generating assembly, the gas generating assembly is arranged in a cavity and is adapted to be triggered to form inert gas when the battery pack is in a preset condition; the inert gas enters the shell of the battery pack through the communication hole of the shell, so as to dilute and / or extinguish the thermal runaway product in the shell, which can avoid the accumulation of the thermal runaway product in the shell, reduce or even avoid the possibility of deflagration, and improve the safety performance of the battery pack.

[0044] In addition to the technical problems solved by the embodiments of the present application, the technical features constituting the technical solutions and the beneficial effects brought by the technical features, other technical problems solved by the thermal runaway prevention and control device, the battery pack and the power consumption device provided by the embodiments of the present application, other technical features included in the technical solutions and the beneficial effects brought by the technical features will be further described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A perspective view of the thermal runaway prevention device provided in the embodiments of this application;

[0047] Figure 2 Three-dimensional view of a portion of the structure of the thermal failure prevention device provided in the embodiments of this application. Figure 1 ;

[0048] Figure 3 for Figure 2 The main view;

[0049] Figure 4 Three-dimensional view of a portion of the structure of the thermal failure prevention device provided in the embodiments of this application. Figure 2 ;

[0050] Figure 5 for Figure 4 The main view;

[0051] Figure 6 For along Figure 5 A cross-sectional view along the AA direction;

[0052] Figure 7 A schematic diagram of the housing provided in an embodiment of this application;

[0053] Figure 8 for Figure 7 The main view;

[0054] Figure 9 For along Figure 8 Cross-sectional view along the BB direction;

[0055] Figure 10 A perspective view of the gas generating assembly provided in an embodiment of this application;

[0056] Figure 11 for Figure 10 The main view;

[0057] Figure 12 A schematic diagram of the reinforcing plate provided in an embodiment of this application;

[0058] Figure 13 for Figure 12 The main view;

[0059] Figure 14 A schematic diagram of the battery pack provided in the embodiments of this application.Figure 1 ;

[0060] Figure 15 Schematic diagram of battery pack provided for embodiments of the present application Figure 2 ;

[0061] Figure 1 Control logic diagram of battery pack provided for embodiments of the present application

[0062] BRIEF DESCRIPTION OF DRAWINGS

[0063] 1: battery pack;

[0064] 10: thermal runaway prevention and control device;

[0065] 100: housing; 110: accommodation chamber; 120: first communication hole; 130: frame; 131: first side plate; 132: second side plate; 133: reinforcing chamber; 140: first end plate; 150: reinforcing plate; 151: reinforcing frame; 152: reinforcing rib; 1521: arc segment; 160: protective plate; 170: buffer foam; 180: triangular reinforcing rib;

[0066] 200: gas generating assembly; 210: main body; 211: second communication hole; 220: gas generating agent; 230: heating part; 240: protective cover; 241: third communication hole; 250: restraint; 251: arc part; 252: first folding part; 253: second folding part; 260: fairing; 261: fourth communication hole;

[0067] 300: support; 310: circuit slot; 320: notch; 330: fifth communication hole;

[0068] 20: cell group; 21: cell;

[0069] 30: shell; 31: bottom plate; 32: edge beam;

[0070] 40: controller;

[0071] 50: temperature sensor;

[0072] 60: gas sensor;

[0073] 70: pressure sensor. DETAILED DESCRIPTION

[0074] The high temperature, high oxygen content and high concentration of combustible material caused by thermal runaway of the battery will cause the battery to explode seriously if no corresponding measures are taken. In the related art, a heat insulation component is usually arranged between adjacent battery cells, wherein the heat insulation component is internally provided with a gas generating device. The gas enables an expansion part arranged to expand, so that the target object and the heat insulation target part are spaced apart, thereby avoiding the target object from being in contact with the heat insulation target part after thermal runaway, and reducing the spread of thermal runaway.

[0075] This heat insulation structure design effectively utilizes the bulging feature of the battery cell before failure, and reduces the reaction heat of the battery cell out of control by extruding the battery cell with an external force to make it open the valve as soon as possible and spray the electrolyte outward, thereby reducing the influence of heat spread. However, the expansion part of the heat insulation component discharges the thermal runaway products formed by the battery cell failure into the shell of the battery pack, causing the thermal runaway products to accumulate in the shell, greatly increasing the possibility of explosion, and reducing the safety performance of the battery pack.

[0076] To solve the above technical problems, the embodiments of the present application provide a thermal runaway prevention and control device, a battery pack and an electrical equipment. The thermal runaway prevention and control device is arranged in the shell of the battery pack. The thermal runaway prevention and control device comprises a shell and a gas generating assembly. The gas generating assembly is arranged in the accommodating cavity and is adapted to be triggered to form inert gas under a preset condition of the battery pack. The inert gas enters the shell of the battery pack through the communication hole of the shell to dilute and / or flame retard the thermal runaway products in the shell. In this way, the accumulation of the thermal runaway products in the shell can be avoided, the possibility of explosion can be reduced or even avoided, and the safety performance of the battery pack is improved.

[0077] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0078] For reference Figure 1 The embodiments of the present application provide a thermal runaway prevention and control device which is suitable for being installed in the shell of a battery pack to prevent the battery pack from exploding and improve the safety performance of the battery pack.

[0079] The thermal runaway prevention and control device comprises a shell 100 which is used as a main part of the thermal runaway prevention and control device and provides a support carrier for the gas generating assembly 200 or other components.

[0080] For reference Figure 1 and Figure 14, the shell 100 comprises a frame 130, a first end plate 140 and a second end plate (not shown in the figure). In the thickness direction of the frame 130, the frame 130 has two ends of the opposite opening, the first end plate 140 and the second end plate are connected with the frame 130 respectively, and cover the corresponding opening. The following embodiments are taken as the rectangular frame 130, the length direction of the frame 130 is Figure 15 the DL direction, the width direction of the frame 130 is Figure 2 the DW direction, and the thickness direction of the frame 130 is Figure 3 the DH direction.

[0081] The frame 130, the first end plate 140 and the second end plate are connected with each other to form the accommodating chamber 110 of the shell 100, wherein the frame 130 and the first end plate 140 can be welded, and the frame 130 and the second end plate can be welded to improve the structural strength of the shell 100.

[0082] The shell 100 further has a first communication hole 120, and the first communication hole 120 is in communication with the accommodating chamber 110. When the shell 100 comprises the frame 130, the first communication hole 120 can be arranged on the frame 130.

[0083] In the embodiment, the first end plate 140 and the second end plate are flat structures, and no other structures are arranged on the first end plate 140 and the second end plate. Thus, when the thermal runaway prevention and control device 10 is installed on the battery pack 1 (please refer to Figure 4 and Figure 5 ), the first end plate 140 and the second end plate can be better in contact with the installation plane, and the installation stability of the thermal runaway prevention and control device 10 and the shell 30 of the battery pack 1 is improved.

[0084] Please continue to refer to Figure 6 to Figure 9 and Figure 7 , the thermal runaway prevention and control device provided in the embodiment further comprises a gas generating assembly 200, the gas generating assembly 200 is arranged in the accommodating chamber 110, and is suitable for being triggered to form inert gas under a preset condition of the battery pack 1; wherein the inert gas enters the shell of the battery pack 1 through the first communication hole 120 to dilute and / or extinguish the thermal runaway product in the shell, so that the accumulation of the thermal runaway product in the shell can be avoided, the possibility of deflagration is reduced or even avoided, and the safety performance of the battery pack is improved.

[0085] It should be noted that the preset condition in the embodiment can be understood as a critical judgment standard for the battery pack to produce deflagration. The preset condition can be that the concentration of the flammable gas of the battery pack is greater than a safety critical value, or the temperature of the battery pack is greater than a safety critical value, or the pressure of the battery pack is greater than a safety critical value.

[0086] The gas generating assembly 200 can be arranged in the housing 100 in various manners. In some embodiments, the gas generating assembly 200 is arranged on the inner wall of the housing 100, and the gas outlet of the gas generating assembly 200 can be directed to the center of the housing 100, so that the arrangement position of the gas generating assembly 200 can be freely arranged according to the structure of the battery pack.

[0087] In some other embodiments, the gas generating assembly 200 can also be arranged in the housing 100 through other components. For example, referring to Figure 8 and Figure 10 The thermal runaway prevention and control device further comprises a support 300 connected with the housing 100 and arranged in the accommodation chamber 110.

[0088] The support 300 can be connected with the two side plates opposite to the frame 130, for example, the support 300 can be connected with the two side plates in the length direction of the frame 130, or can be connected with the two side plates in the width direction of the frame 130, and the specific connection manner can be freely arranged according to actual needs.

[0089] In the thickness direction of the support 300, the gas generating assembly 200 is arranged on at least one side of the support 300. That is, the number of the gas generating assembly 200 can be one or two. When the number of the gas generating assembly 200 is one, the gas generating assembly 200 can be arranged on any one side of the support 300 in the thickness direction of the support 300. When the number of the gas generating assembly 200 is two, the two gas generating assemblies 200 are arranged on the two sides of the support 300 in the thickness direction of the support 300 and arranged along the thickness direction of the support 300. In this way, the arrangement of the support 300 can facilitate the installation of the gas generating assembly 200 and simplify the installation and disassembly of the gas generating assembly 200.

[0090] In some embodiments, referring to Figure 11 The support 300 provided by the embodiments of the present application has a circuit slot 310 and a notch 320. The circuit slot 310 extends along the width direction of the frame 130, and the size of the circuit slot 310 in the width direction of the frame 130 can be equal to half of the width of the frame 130.

[0091] The notch 320 and the circuit slot 310 are in communication with each other. The circuit slot 310 is adapted to pass through a connection wire harness (not shown in the figure), and one end of the connection wire harness is electrically connected with the heating part 230 through the notch 320, so as to provide electric energy or other control signals for the heating part 230.

[0092] The embodiment avoids the disordered winding and distribution of the connection wire harness by installing the connection wire harness in the circuit slot 310, greatly improving the rationality and standardization of the line layout. At the same time, the gap 320 and the circuit slot 310 are in communication with each other, so that one end of the connection wire harness can be conveniently electrically connected with the heating part 230 through the gap 320.

[0093] It should be noted that the circuit slot 310 can also pass through the support 300, so that the support 300 is provided with an arc-shaped plate which can cover the opening of the circuit slot 310 in the thickness direction of the frame 130, so as to increase the area of the circuit slot 310 and facilitate the layout of the connection wire harness.

[0094] Please continue to refer to Figure 2 and Figure 3 The support 300 is also provided with a plurality of fifth communication holes 330 for communicating the accommodation chambers 110 on both sides of the support 300. The plurality of fifth communication holes 330 are used to balance the pressure of the accommodation chambers 110 on both sides of the support 300, so as to avoid excessive explosion during the triggering of the gas generation process, and ensure the effective connection of the connection wire harness in the circuit slot 310 and the gas generation assembly 200.

[0095] Please refer to Figure 7 to Figure 8 and Figure 7 The gas generation assembly 200 provided by the embodiment includes a main body part 210 and a heating part 230. The main body part 210 has a reaction chamber and a second communication hole 211. The second communication hole 211 is arranged on the main body part 210 and in communication with the reaction chamber. It should be noted that the number of second communication holes 211 can include a plurality of second communication holes 211 which can be arranged in a circumferential direction of the main body part 210.

[0096] The gas generation agent 220 is arranged in the reaction chamber, and the heating part 230 is arranged in the reaction chamber and in contact with the gas generation agent 220. When the battery pack is in a preset condition, the heating part 230 is triggered to generate heat, so that the gas generation agent 220 generates inert gas at a preset temperature. The heating part 230 can be a heating wire.

[0097] The gas generation agent 220 includes nitro guanidine or guanidine nitrate, or the gas generation agent 220 includes cyclotrimethylene trinitramine. Hereinafter, the gas generation agent 220 will be described mainly as an example of a gas generation agent which is nitro guanidine.

[0098] Nitroguanidine is an organic compound with the chemical formula C2H6N4O2, which is a white hygroscopic crystal, odorless or slightly special odor. Under the condition of heating or mechanical impact, the gas generating agent dominated by nitroguanidine and the oxidant (nitrate or metal oxide) will decompose at high temperature and release nitrogen and a small amount of carbon dioxide and other inert gases.

[0099] After that, the inert gas is discharged into the shell of the battery pack through the second communication hole 211 of the main body 210, so that the inert gas can dilute and / or flame retard the thermal runaway products in the shell, so that the accumulation of thermal runaway products in the shell can be avoided, the possibility of deflagration is reduced or even avoided, and the safety performance of the battery pack is improved.

[0100] In addition, under one atmosphere, the nitrogen yield of each gram of nitroguanidine is 0.431L / g, and the carbon dioxide yield is 0.215L / g. For a battery pack, the volume of the gap in the battery pack is about 40L, so for a whole battery pack, the amount of nitroguanidine is about 100g. The amount of inert gas can be reasonably set so that the battery structure will not be damaged due to excessive internal pressure of the battery pack, and the effective dilution and protection effect cannot be achieved due to too little inert gas, ensuring the structural integrity and performance stability of the battery pack under normal working and abnormal conditions.

[0101] It should be noted that the main body 210 can include a cylinder and a cover plate arranged in the cylinder, the top surface of the cover plate is lower than the top surface of the cylinder, and the gas generating agent 220 is arranged in the space surrounded by the cover plate and the cylinder. At this time, the second communication hole 211 can be arranged on the cylinder and / or the cover plate.

[0102] In some embodiments, the two ends of the heating part 230 are respectively connected with the inner wall of the main body 210 and pass through the gas generating agent 220, or in other words, the heating part 230 is embedded in the gas generating agent 220. In this way, the contact area of the heating part 230 and the gas generating agent 220 can be improved, and when the heating part 230 works, the heat can be transferred to the gas generating agent 220 more quickly and uniformly, so that the gas generating agent 220 reaches the required reaction temperature in a shorter time, thereby accelerating the rate of the gas generating reaction and improving the gas generating efficiency.

[0103] In some embodiments, the gas generating assembly 200 further includes a protective cover 240, and the protective cover 240 covers the main body 210 and is connected with the main body 210. Alternatively, the protective cover 240 can also be fixedly connected with the support 300. It should be noted that the protective cover 240 can have a cylindrical structure with two open ends. The shape of the protective cover 240 can be circular, or it can have other structures.

[0104] The protective cover 240 is provided with a third communication hole 241 for communicating the area between the protective cover 240 and the main body 210 with the accommodation chamber 110. The protective cover 240 is provided in this embodiment to protect the gas generating assembly 200, thereby improving the safety of the gas generating assembly 200.

[0105] It should be noted that the protective cover 240 and the main body 210 can be directly connected or indirectly connected. For example, the gas generating assembly 200 further comprises a constraint member 250 arranged between the protective cover 240 and the main body 210 and connected with the protective cover 240 and the main body 210, respectively.

[0106] The constraint member 250 can buffer the shock effect of the inert gas generated by the gas generating assembly 200. On the one hand, it can avoid loosening or even breaking the connection between the protective cover 240 and the main body 210, so that the protective cover 240 can better protect the gas generating assembly 200. On the other hand, it can avoid damage to the internal structure of the main body 210 caused by strong shock impact, such as component displacement and deformation, thereby improving the gas generation efficiency and stability of the gas generating assembly 200.

[0107] As a possible implementation of the constraint member 250, the constraint member 250 comprises an arc-shaped portion 251, a first folded portion and a second folded portion. In the direction in which the protective cover points to the main body, the first folded portion 252 and the second folded portion 253 are respectively connected with both ends of the arc-shaped portion 251 and extend in a direction away from the center of the arc-shaped portion 251. The first folded portion 252 is connected with the main body 210, and the second folded portion 253 is connected with the protective cover 240.

[0108] In this way, the constraint member 250 is a semicircular structure with an opening. The semicircular constraint member 250 has considered its failure mode, i.e. if under a large impact, the semicircular constraint member 250 will stretch, bend, break, etc. to disperse and absorb the huge energy generated by the shock, thereby avoiding the shock energy directly acting on other key components of the gas generating assembly 200, greatly reducing the risk of damage to other components due to direct impact, and providing reliable safety buffer protection for the entire assembly.

[0109] It should be noted that the number of constraint members 250 can be one or more. When the number of constraint members 250 is more than one, the plurality of constraint members 250 are arranged at intervals along the circumference of the main body 210, so that the constraint ability of the constraint member 250 is maximized, thereby improving the stable operation of the gas generating assembly 200.

[0110] Please refer to Figure 8 and Figure 12The gas generating assembly 200 provided by the embodiments of the present application further comprises a fairing 260, the fairing 260 is sleeved on the protective cover 240, and a plurality of fourth communication holes 261 are arranged on the fairing 260. The fairing 260 comprises a cover body and a cover, the cover body is fixedly connected with the support 300, and the cover is connected with the end of the cover body away from the support 300, so that the cover and the cover body enclose the inner cavity of the protective cover 240.

[0111] The plurality of fourth communication holes 261 of the fairing 260 can also cooperate with the restraint 250 to more effectively buffer the explosion formed during the gas generation of the gas generating assembly 200.

[0112] The gas generating assembly 200 is prone to explosion when the gas generating agent 220 generates gas rapidly, and the semicircular restraint 250 is designed on the periphery of the main body 210 and is connected and fixed with the protective cover 240. This structure plays a role in fixing the main body 210 when the gas generating assembly 200 does not work. After the gas generating assembly 200 works, the restraint 250 cooperates with the protective cover 240 and the fairing 260 to buffer the explosion of the gas generating assembly 200.

[0113] Please refer to Figure 13 In some embodiments, the rectangular frame of the frame 130 comprises a first side plate 131 and a second side plate 132, and the first side plate 131 and the second side plate 132 are oppositely arranged along the length direction of the frame 130.

[0114] The number of the first communication holes 120 comprises a plurality of first communication holes 120, and a part of the first communication holes 120 are arranged on the first side plate 131 and penetrate the first side plate 131. The remaining first communication holes 120 are arranged on the second side plate 132 and penetrate the second side plate 132.

[0115] In this way, the accommodation chamber 110 can be in communication with the outer shell on both sides of the length direction of the frame 130, and the smoothness of the circulation of the inert gas generated by the gas generating assembly 200 is improved.

[0116] Please refer to Figure 13 , Figure 6 , Figure 9 and Figure 14 At least one of the first side plate 131 and the second side plate 132 is provided with a reinforcing chamber 133, and the reinforcing plate 150 is arranged in the reinforcing chamber 133.

[0117] The reinforcing plate 150 comprises a reinforcing frame 151 and a plurality of reinforcing ribs 152. The reinforcing frame 151 is a rectangular frame, and the plurality of reinforcing ribs 152 are arranged in the reinforcing frame 151 and arranged in the thickness direction of the frame 130 in sequence.

[0118] Each reinforcing rib 152 comprises a plurality of arc segments 1521 connected to each other, and the arc segments 1521 of one of the two adjacent reinforcing ribs 152 are located between the two arc segments 1521 of the other reinforcing rib 152. Among them, Figure 15 The components in the dashed box are reinforcing ribs 152.

[0119] In this way, the reinforcing plate 150 can be used to resist the extrusion in the width direction DW of the frame 130, so as to avoid being extruded and failed by the swelling of the battery cell. In addition, each reinforcing rib 152 is composed of a plurality of arc segments 1521 connected to each other, which can better disperse stress when bearing extrusion. The arc segment 1521 has good flexibility and anti-deformation ability, and when extruded, the arc segment 1521 can elastically deform to a certain extent, dispersing the concentrated stress to the entire arc structure, thereby avoiding local stress too large to cause the reinforcing rib 152 to break or be damaged.

[0120] It should be noted that the frame 130 located at the corner position in the accommodating cavity 110 is also provided with a triangular reinforcing rib 180, so as to prevent the frame 130 from being severely deformed in the length direction DL and the height direction DH.

[0121] Please refer to Figure 16 and ​ The shell 100 further comprises at least one protective plate 160, the at least one protective plate 160 is arranged on at least one side of the frame 130 in the width direction, and the at least one protective plate 160 and the frame 130 enclose a protection cavity; the protection cavity is provided with a buffer foam 170.

[0122] In this way, the buffer foam 170 fills the protection cavity between the protective plate 160 and the frame 130, which can not only protect the circuit, but also buffer the impact from the bottom, prevent the structure from failing after being impacted, and improve the stability of the thermal runaway control device 10.

[0123] It should be noted that the frame 130 further comprises a third side plate and a fourth side plate arranged at intervals along the width direction thereof, and the third side plate and the fourth side plate are used to connect the first side plate and the second side plate to form the frame. The at least one protective plate 160 can cover at least one of the third side plate and the fourth side plate. Among them, the cross-sectional shape of the protective plate 160 can be a U-shaped structure, so that the protective plate 160 can form a cavity with the corresponding side plate.

[0124] Please refer to ​ and ​ The application further provides a battery pack 1, comprising a battery cell group 20 and the thermal runaway control device 10 described in any of the above embodiments. Among them, the battery cell group 20 comprises a plurality of battery cells 21 arranged in a first direction.

[0125] The thermal runaway prevention and control device 10 is located on at least one side of the battery cell group 20 in the first direction and is arranged in contact with the battery cell group 20. Alternatively, at least two adjacent battery cells 21 are provided with one thermal runaway prevention and control device 10.

[0126] In this way, the inert gas formed by the thermal runaway prevention and control device 10 can dilute or extinguish the thermal runaway products in the battery pack, avoid the accumulation of thermal runaway products in the shell, reduce or even avoid the possibility of deflagration, and improve the safety performance of the battery pack.

[0127] In some embodiments, the thermal runaway prevention and control device 10 includes a frame 130 and a first communication hole 120 arranged on the frame 130, the first communication hole 120 being used for the inert gas generated by the thermal runaway prevention and control device 10 to pass through. The first communication hole 120 is arranged on the side plate of the frame 130. For example, the frame 130 includes a first side plate 131 and a second side plate 132 arranged opposite to each other, and the first communication hole 120 can be arranged on at least one of the first side plate 131 and the second side plate 132. That is, in some embodiments, the first communication hole 120 can be arranged on the first side plate 131 alone or on the second side plate 132 alone. In other embodiments, part of the first communication hole 120 is arranged on the first side plate 131, and part of the first communication hole 120 is arranged on the second side plate 132.

[0128] The side plate where the first communication hole 120 is arranged intersects the first direction, for example, the side plate where the first communication hole 120 is arranged is perpendicular to the first direction. In this way, the large surface of the frame 130 is in contact with the large surface of the battery cell 21, which can improve the contact area between the frame 130 and the battery cell 21, and further improve the connection strength between the frame 130 and the battery cell 21. At the same time, the inert gas formed by the thermal runaway prevention and control device 10 can be more smoothly discharged into the shell of the battery pack through the first communication hole 120, so as to better dilute and / or extinguish the thermal runaway products in the shell.

[0129] In some embodiments, the battery pack 1 further includes a shell 30, the shell 30 including a bottom plate 31 and at least two edge beams 32, the at least two edge beams 32 being arranged in a spaced manner along the first direction and connected with the bottom plate 31 to enclose a cavity, the cavity being adapted to accommodate the battery cell group 20.

[0130] The battery pack 1 further includes a pressure relief channel (not shown in the figure), the pressure relief channel being arranged on the shell 30 and communicating the cavity of the shell 30 with the external space, so that a convection is formed between the cavity of the shell 30 and the external space, reducing the internal temperature of the battery pack and further reducing the ignition point.

[0131] It should be noted that the pressure relief channel of the embodiment of the present application can be a channel arranged on the shell, a scraping bottom bevel or a scraping bottom opening on the bottom plate 31. The scraping bottom bevel can be a break formed by the battery pack being scraped by a sharp object during use. After the foreign matter (stones or other sharp objects) in the scraping bottom of the battery pack is extracted, the high-pressure inert gas generated in the battery pack forms a low-oxygen and low-temperature atmosphere at the break, preventing the occurrence of fire and explosion in the battery pack.

[0132] Please refer to ​ In some embodiments, the battery pack 1 further comprises a controller 40 and a detection component connected to the controller 40, the detection component being adapted to detect a parameter in the shell, the detection component comprising at least one of a temperature sensor 50, a gas sensor 60 and a pressure sensor 70.

[0133] The controller 40 is further connected to the gas generating assembly 200 for controlling the working state of the gas generating assembly 200 according to the parameter.

[0134] The detection component can be arranged on the shell 30, and the detection end of the detection component can be located in the shell 30, so that the parameter in the shell can be better detected. The parameter detected by any one of the temperature sensor 50, the gas sensor 60 and the pressure sensor 70 is transmitted to the controller 40, and the controller 40 controls the working state of the gas generating assembly 200 according to the above-mentioned parameter.

[0135] It should be understood that when any one of the parameters detected by any one of the temperature sensor 50, the gas sensor 60 and the pressure sensor 70 is abnormal, the controller 40 controls the gas generating assembly 200 to start working, so that the gas generating assembly 200 forms inert gas.

[0136] Taking the temperature sensor 50 as an example, the temperature sensor 50 is used to detect the real-time temperature in the shell and transmit the real-time temperature to the controller 40. The controller 40 can compare the real-time temperature with a preset threshold value. If the real-time temperature is greater than the preset threshold value, the controller 40 can control the gas generating assembly 200 to start working.

[0137] After the gas generating assembly 200 is triggered to generate inert gas for the first time, the combustible gas generated by the out-of-control battery cell increases, and the internal temperature of the battery pack 1 rises. At this time, there is not enough oxygen and other combustion-supporting agents, so that "smoldering" occurs in the inside of the battery pack. At this time, only the addition of combustion-supporting agents will cause explosion. In order to prevent this situation from occurring, the embodiment of the present application can use the controller to control and realize batch triggering of inert gas (for example, triggering once every preset time period and generating inert gas), so as to maintain the atmosphere of nitrogen and other fire-retardant gases in the battery pack, prevent the accumulation of combustible gas and the increase of temperature and the "backflow" of combustion-supporting agents, and realize the "active safety" of the battery pack.

[0138] The embodiment of the present application provides a kind of electric equipment, including electric device and the battery pack 1 described in any embodiment, battery pack 1 is electrically connected with electric device, for providing electric energy for electric device.

[0139] The electric equipment in the embodiment of the present application can be a vehicle, for example: the vehicle can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle etc.Correspondingly, the electric device can be the driving mechanism of the vehicle, or the control system of the vehicle.In addition, the electric equipment can also be other energy storage devices, such as energy storage power station.

[0140] Since the electric equipment in the embodiment includes the battery pack described in any embodiment, the structure and advantages of the electric equipment including the battery pack are not repeated here.

[0141] Each embodiment or implementation in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between each embodiment can be referred to each other.

[0142] It should be pointed out that in the specification, "one embodiment", "embodiment", "exemplary embodiment", "some embodiments" and the like mean that the described embodiment can include a specific feature, structure or property, but not necessarily every embodiment includes the specific feature, structure or property.In addition, such phrases do not necessarily refer to the same embodiment.In addition, when a specific feature, structure or property is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or property in combination with other embodiments described explicitly or implicitly.

[0143] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them;Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features thereof;And these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A thermal runaway prevention and control device (10), characterized in that, The thermal runaway prevention device (10) is adapted to be installed inside the housing (30) of the battery pack (1), and includes: The housing (100) has a receiving chamber (110) and a first communicating hole (120) communicating with the receiving chamber (110). A gas generating assembly (200) is disposed within the receiving chamber (110) and is adapted to be triggered by the battery pack (1) under preset conditions to form an inert gas; wherein the inert gas enters the outer casing (30) of the battery pack (1) through the first connecting hole (120) to dilute and / or retard thermal runaway products within the outer casing (30); The gas generating assembly (200) includes a main body (210) and a heating part (230); the main body (210) has a reaction chamber and a second communication hole (211) communicating with the reaction chamber, and a gas generating agent (220) is provided in the reaction chamber; the heating part (230) is disposed in the reaction chamber and is in contact with the gas generating agent (220); When the battery pack (1) is under preset conditions, the heating part (230) is triggered to generate heat so that the gas generating agent (220) generates inert gas at a preset temperature; The gas generating assembly (200) further includes a protective cover (240), which covers the main body (210) and is connected to the main body (210); The protective cover (240) is provided with a third connecting hole (241), which is used to connect the area between the protective cover (240) and the main body (210) with the receiving chamber (110). The gas generating assembly (200) further includes a constraint member (250), which is disposed between the protective cover (240) and the main body (210) and is connected to the protective cover (240) and the main body (210) respectively; The constraint member (250) includes an arc-shaped portion (251), a first folded portion (252), and a second folded portion (253); in the direction from the protective cover (240) to the main body portion (210), the first folded portion (252) and the second folded portion (253) are respectively connected to the two ends of the arc-shaped portion (251); The first folding part (252) is connected to the main body part (210), and the second folding part (253) is connected to the protective cover (240).

2. The thermal runaway prevention device (10) according to claim 1, characterized in that, The gas generating assembly (200) is disposed on the inner wall of the housing (100).

3. The thermal runaway prevention device (10) according to claim 1, characterized in that, The thermal runaway prevention device (10) further includes a support member (300), which is connected to the housing (100) and located in the receiving chamber (110); In the thickness direction of the support member (300), the gas generating assembly (200) is disposed on at least one side of the support member (300).

4. The thermal runaway prevention device (10) according to claim 3, characterized in that, The support member (300) has a circuit groove (310) and a notch (320) communicating with the circuit groove (310). The circuit groove (310) is adapted to allow a connecting wire harness to pass through, and one end of the connecting wire harness is electrically connected to the gas generating assembly (200) through the notch (320).

5. The thermal runaway prevention device (10) according to claim 4, characterized in that, The support member (300) is also provided with a plurality of fifth connecting holes (330), which are used to connect the receiving chambers located on both sides of the support member (300).

6. The thermal runaway prevention device (10) according to any one of claims 1-5, characterized in that, The two ends of the heating part (230) are respectively connected to the inner wall of the main body part (210) and the gas generating agent (220) is inserted through it.

7. The thermal runaway prevention device (10) according to claim 6, characterized in that, The gas-generating agent includes nitroguanidine or guanidine nitrate, or the gas-generating agent includes cyclotrimethylenetrinitramine.

8. The thermal runaway prevention device (10) according to any one of claims 1-5, characterized in that, The gas generating assembly (200) further includes a shroud (260), which is fitted onto the protective cover (240), and the shroud (260) is provided with a plurality of spaced fourth connecting holes (261).

9. The thermal runaway prevention device (10) according to any one of claims 1-5, characterized in that, The housing (100) includes a frame (130), a first end plate (140), and a second end plate. In the thickness direction of the frame (130), the frame (130) has openings at opposite ends. The first end plate (140) and the second end plate are respectively connected to the frame (130) and cover the corresponding openings. The first connecting hole (120) is disposed on the frame (130).

10. The thermal runaway prevention device (10) according to claim 9, characterized in that, The frame (130) is a rectangular frame, and the number of the first connecting holes (120) includes multiple; The frame (130) includes a first side plate (131) and a second side plate (132) arranged opposite to each other along its length direction. A portion of the first connecting holes (120) are disposed on the first side plate (131), and the remaining portion of the first connecting holes (120) are disposed on the second side plate (132).

11. The thermal runaway prevention device (10) according to claim 10, characterized in that, At least one of the first side plate (131) and the second side plate (132) is provided with a reinforcing chamber (133), and a reinforcing plate (150) is provided in the reinforcing chamber (133).

12. The thermal runaway prevention device (10) according to claim 11, characterized in that, The reinforcing plate (150) includes a reinforcing frame (151) and a plurality of reinforcing ribs (152) disposed within the reinforcing frame (151), the plurality of reinforcing ribs (152) being arranged sequentially along the thickness direction of the frame; Each of the reinforcing ribs (152) includes a plurality of interconnected arc segments (1521), and in two adjacent reinforcing ribs (152), the arc segment (1521) of one of the reinforcing ribs (152) is located between two arc segments (1521) of the other reinforcing rib (152).

13. The thermal runaway prevention device (10) according to claim 12, characterized in that, The housing (100) further includes at least one protective plate (160), which is disposed on at least one side of the frame (130) in the width direction, and the at least one protective plate (160) and the frame (130) enclose a protective cavity, and a cushioning foam (170) is disposed in the protective cavity.

14. A battery pack (1), characterized in that, Includes a battery cell assembly (20) and a thermal runaway prevention device (10) according to any one of claims 1-13, wherein the battery cell assembly (20) includes a plurality of battery cells (21) arranged sequentially in a first direction. The thermal runaway prevention device (10) is located on at least one side of the battery cell assembly (20) in the first direction and is attached to the battery cell assembly (20); or, a thermal runaway prevention device (10) is provided between at least two adjacent battery cells (21).

15. The battery pack (1) according to claim 14, characterized in that, The thermal runaway prevention device (10) includes a frame (130) and a first connecting hole (120) disposed in the frame (130). The first connecting hole (120) is used for the inert gas generated by the thermal runaway prevention device (10) to pass through. The side plate where the first connecting hole (120) is located intersects with the first direction.

16. The battery pack (1) according to claim 15, characterized in that, The battery pack (1) also includes a housing (30) and a pressure relief channel. The housing (30) includes a base plate (31) and at least two side beams (32). The at least two side beams (32) are spaced apart along the first direction and connected to the base plate (31) to form a cavity. The cavity is adapted to accommodate the battery cell assembly (20). The pressure relief channel is located in the outer shell (30) and connects the cavity with the external space.

17. The battery pack (1) according to any one of claims 14-16, characterized in that, The battery pack (1) further includes a controller (40) and a detection component connected to the controller (40), the detection component being adapted to detect parameters within the housing, the detection component including at least one of a temperature sensor (50), a gas sensor (60) and a pressure sensor (70); The controller (40) is also connected to the gas generating component (200) and is used to control the working state of the gas generating component (200) according to the parameters.

18. An electrical appliance, characterized in that, It includes an electrical device and a battery pack (1) as described in any one of claims 14-17, wherein the battery pack (1) is electrically connected to the electrical device and is used to provide electrical energy to the electrical device.

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