Explosion-proof system of battery pack

Abstract

The invention discloses an explosion-proof system of a battery pack. The explosion-proof system comprises a battery cell, a cell tray, a fixed shell, a heat insulation assembly and a flow guide assembly, the fixed shell is arranged at the bottom of the battery cell tray, and a gap is formed between the fixed shell and the battery cell tray; the flow guide assembly comprises a flow guide table and a flow guide channel, the flow guide table is arranged at the bottom of the through hole, the fixed shell is arranged at the bottom of the battery cell tray, and the flow guide channel is formed between the fixed shell and the battery cell tray and is communicated with the through hole and the flow guide table respectively; the heat insulation assembly comprises arc-shaped blocking fins which are uniformly arranged at the bottom of the battery cell tray at intervals. According to the invention, secondary damage of high-temperature sprayed objects to other parts such as pipelines on two sides of the battery pack can be prevented, meanwhile, the situation that the high-temperature sprayed objects are close to a passenger compartment bottom plate, so that the temperature of the passenger compartment bottom plate is increased too quickly, and people in a vehicle are hurt is prevented, and the high-temperature sprayed objects are isolated and guided through the arc-shaped barrier fins, so that the service life of the vehicle is prolonged. And the condition of heat diffusion is prevented.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and more specifically, to an explosion-proof system for a battery pack. Background Art

[0002] The safety of new energy vehicles is receiving more and more attention. In addition to meeting the requirements of GB 38031 standard such as no fire and no explosion, and passing the national standard mandatory inspection and certification, many manufacturers have put forward higher safety requirements for the development of new products, such as requiring zero diffusion in the event of thermal runaway, and will use the satisfaction of such requirements as a highlight of the promotion of new products when they are launched. Existing battery cells can be divided into square shell battery cells, soft pack battery cells and cylindrical battery cells according to their structural form. Cylindrical battery cells have the advantages of mature technology, low cost and stable structure. In order to meet the requirements of pure electric range of vehicles and increase the battery pack power in a limited space, large-size high-nickel cylindrical battery cells came into being.

[0003] The battery pack structure of the existing technology is simple. When thermal runaway occurs, the ejected material is easy to gather and affect the surrounding cells. In addition, for large-sized high-nickel cylindrical cells, the single cell energy is high, the ejected material temperature is high, and the ejected material is large, which is easy to cause heat diffusion, resulting in endangerment of the safety of the entire vehicle and failing to meet safety requirements.

[0004] Therefore, how to provide an explosion-proof system for a battery pack has become a technical problem that urgently needs to be solved in this field. Summary of the invention

[0005] An object of the present invention is to provide a new technical solution for an explosion-proof system of a battery pack.

[0006] According to a first aspect of the present invention, there is provided an explosion-proof system for a battery pack, comprising: a battery cell, a cell tray, a fixed housing, a heat insulation component and a flow guide component;

[0007] The battery tray is provided with a plurality of through holes for installing battery cells; the fixed shell is arranged at the bottom of the battery tray, and there is a gap between the fixed shell and the battery tray;

[0008] The flow guide component is used to guide the high-temperature ejected matter in the through hole to the outside of the fixed shell; the flow guide component includes a flow guide platform and a flow guide channel, the flow guide platform is arranged at the bottom of the through hole, the fixed shell is arranged at the bottom of the battery tray, the flow guide channel is formed between the fixed shell and the battery tray, and the flow guide channel is communicated with the through hole and the flow guide platform respectively;

[0009] The heat insulation component is arranged at the bottom of the battery cell tray to separate the battery cells; the heat insulation component includes arc-shaped barrier fins, and the arc-shaped barrier fins are evenly spaced and arranged at the bottom of the battery cell tray.

[0010] Optionally, the guide platform is a circular ring structure, and the guide platform extends from the bottom of the through hole to the guide channel;

[0011] The inner wall of the guide platform is inclined, and the angle between the inner wall of the guide platform and the axis of the through hole is 5 to 20 degrees.

[0012] Optionally, an anti-slip groove is further provided inside the through hole, the anti-slip groove is located above the guide platform, and the inner diameter of the anti-slip groove is smaller than the inner diameter of the through hole, the inner diameter of the anti-slip groove is larger than the inner diameter of the guide platform, and the bottom of the battery cell abuts against the top of the anti-slip groove.

[0013] Optionally, the flow guide assembly further includes a flow guide cover, which is arranged on the side wall of the fixed shell and is inclined toward the ground, and the flow guide channel is respectively connected with the through hole, the flow guide platform and the flow guide cover;

[0014] The first end of the air guide cover is connected to the fixed shell, and an air guide hole is arranged inside the air guide cover. The air guide hole is a trapezoidal structure, and the aperture of the air guide hole gradually increases from the first end of the air guide cover to the second end of the air guide cover.

[0015] Optionally, the arc-shaped barrier fins are extended along the width direction of the battery cell tray, the length of the arc-shaped barrier fins is less than or equal to the width of the battery cell tray, and the arc-shaped barrier fins are evenly spaced along the length direction of the battery cell tray.

[0016] Optionally, a middle fixed beam and a fixed frame are provided on the fixed shell, the middle fixed beam is located in the middle of the fixed shell, the fixed frame is located on the side wall of the fixed shell, and the middle fixed beam and the fixed frame are both connected to the bottom of the battery tray;

[0017] The fixing frame is provided with a connecting hole, and the connecting hole is communicated with the guide channel.

[0018] Optionally, the thermal insulation assembly further includes a mica thermal insulation sheet, which is respectively connected to the middle fixed beam and the fixed frame, and the mica thermal insulation sheet blocks the connection hole.

[0019] Optionally, the explosion-proof device of the battery cell further includes an explosion-proof vent valve, and the explosion-proof vent valve is arranged in the connecting hole.

[0020] Optionally, a heat insulating member is poured into the through hole, and the heat insulating member wraps the battery cell.

[0021] Optionally, the explosion-proof system of the battery pack further includes a control component, the control component including a plurality of aluminum wires, a sensor, a controller and an alarm, the aluminum wires extending along the length direction of the battery tray and coinciding with the centers of the plurality of through holes, the plurality of aluminum wires being sequentially arranged on the through holes along the width direction of the battery tray; the sensor being electrically connected to the aluminum wires for detecting current or voltage changes of the aluminum wires;

[0022] The controller is connected to the sensor and the alarm respectively, and is used to receive data information transmitted by the sensor and control the alarm to sound an alarm.

[0023] The beneficial effects of the present invention are:

[0024] The present invention sets a plurality of through holes on the battery tray, sets a fixed shell at the bottom of the battery tray, and there is a gap between the fixed shell and the battery tray; sets a guide platform at the bottom of the through hole, sets a fixed shell at the bottom of the battery tray, and forms a guide channel between the fixed shell and the battery tray, and the guide channel is connected to the through hole and the guide platform respectively. When thermal runaway occurs, high-temperature ejecta containing solids and gases are ejected downward from the through hole under the action of violent explosion force, and are introduced into the guide channel from the guide platform to prevent the high-temperature ejecta from gathering in the same direction and causing other battery cells in the local area to be too high in temperature, thereby causing the problem of heat diffusion; then, the high-temperature ejecta is sprayed to the ground through the guide channel to diffuse the high-temperature ejecta away from the vehicle body. The present invention prevents the high-temperature ejecta from causing secondary damage to other components such as pipelines on both sides of the battery pack, and at the same time prevents the high-temperature ejecta from being close to the bottom plate of the passenger compartment, causing the bottom plate of the passenger compartment to heat up too quickly, causing damage to the people in the vehicle.

[0025] Moreover, the present invention arranges arc-shaped barrier fins at uniform intervals at the bottom of the battery cell tray, isolates and guides high-temperature ejecta through the arc-shaped barrier fins, prevents heat diffusion, and detects thermal runaway of the battery cell through a control component to issue an alarm in time, effectively improving the safety of the driver and passengers.

[0026] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0028] Figure 1 It is a structural diagram of the explosion-proof system of the battery pack of the present invention;

[0029] Figure 2is a structural diagram of the flow guide assembly of the present invention;

[0030] Figure 3 It is a structural diagram of the arc-shaped barrier fin of the present invention;

[0031] Figure 4 It is a structural diagram of the battery tray of the present invention;

[0032] Figure 5 This is a structural diagram of the explosion-proof vent valve of the present invention installed on a fixed frame;

[0033] Figure 6 It is a structural diagram of the fixed frame of the present invention;

[0034] Figure 7 It is a structural diagram of the air deflector of the present invention;

[0035] Figure 8 It is a structural diagram of the fixed housing of the present invention;

[0036] Fig. 9 is a structural diagram of the thermal insulation member of the present invention;

[0037] Fig.10 It is a structural diagram of the intermediate fixed beam of the present invention.

[0038] The markings in the figure are as follows: 1. Fixed shell; 11. Middle fixed beam; 12. Fixed frame; 13. Connection hole; 14. Diversion hole; 2. Battery cell tray; 21. Through hole; 22. Anti-slip groove; 3. Diversion assembly; 31. Diversion platform; 32. Diversion channel; 33. Diversion cover; 34. Diversion hole; 4. Thermal insulation assembly; 41. Arc-shaped barrier fin; 42. Mica thermal insulation sheet; 5. Aluminum wire; 6. Explosion-proof air valve; 7. Fixed block; 8. Battery cell; 9. Thermal insulation. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0042] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] like Figures 1 to 10 As shown, an embodiment of the present invention provides an explosion-proof system for a battery pack, comprising: a battery cell 8, a cell tray 2, a fixed shell 1, a heat insulation component 4 and a flow guide component 3.

[0044] The cell tray 2 is provided with a plurality of through holes 21 for mounting the battery cells 8 ; the fixed shell 1 is arranged at the bottom of the cell tray 2 , and there is a gap between the fixed shell 1 and the cell tray 2 .

[0045] Specifically, the diameter of the battery cell 8 is 35-55 mm, and the height is 70-150 mm. The material of the battery cell 8 is NCM, and the Ni content is above 50%.

[0046] The through holes 21 are evenly spaced along the length and width directions of the battery tray 2, so that the multiple battery cells 8 are respectively arranged inside the multiple through holes 21, so that the multiple battery cells 8 are separated. Even if a certain battery cell 8 has quality problems such as excessive pressure difference and excessive internal resistance, the manufacturer can only peel off and replace the abnormal battery cell 8, which is convenient for the subsequent return of the battery cell 8 system to the factory for repair, greatly reducing the maintenance cost.

[0047] The guide component 3 is used to guide the high-temperature ejecta in the through hole 21 to the outside of the fixed shell 1; the guide component 3 includes a guide platform 31 and a guide channel 32, the guide platform 31 is arranged at the bottom of the through hole 21, the fixed shell 1 is arranged at the bottom of the battery cell tray 2, and the guide channel 32 is formed between the fixed shell 1 and the battery cell tray 2, and the guide channel 32 is connected to the through hole 21 and the guide platform 31 respectively.

[0048] Specifically, the height of the guide channel 32 is 8 mm to 20 mm. The guide channel 32 between the bottom of the battery cell 8 and the fixed shell 1 meets certain height requirements, which reduces the pressure inside the battery pack during thermal runaway to a certain extent, and is also conducive to reducing the internal temperature and reducing the risk of heat diffusion to a certain extent.

[0049] The heat insulation component 4 is arranged at the bottom of the battery tray 2 to separate the battery cells 8 ; the heat insulation component 4 includes arc-shaped barrier fins 41 , which are evenly spaced and arranged at the bottom of the battery tray 2 .

[0050] Specifically, the through holes 21 include a first column and a second column arranged in sequence along the length direction of the cell tray 2, and the projection of the midpoint between two adjacent through holes 21 in the first column coincides with the center of the through holes 21 in the second column; the arc-shaped barrier fin 41 sequentially connects the midpoint between two adjacent through holes 21 in the first column and the midpoint between two adjacent through holes 21 in the second column to form an arc-shaped structure. The through holes 21 are evenly spaced along the length direction and the width direction of the cell tray 2, that is, the through holes 21 arranged along the length direction of the cell tray 2 are divided into the first column and the second column, and the first column and the second column are arranged in sequence.

[0051] The spacing between two adjacent arc-shaped barrier fins 41 is greater than the diameter of the through hole 21, and less than 1.5 times the diameter of the through hole 21. Specifically, the arc-shaped barrier fins 41 are sequentially arranged between the two through holes 21 in the length direction of the battery tray 2, so that the two arc-shaped barrier fins 41 can form multiple conveying channels in the width direction of the battery tray 2. When a battery cell 8 has thermal runaway, except for the battery cells 8 in the same row in the width direction of the battery tray 2, other battery cells 8 are not affected by the high-temperature gas, thereby avoiding the occurrence of heat diffusion.

[0052] In addition, an explosion-proof valve is also provided at the bottom of the battery cell 8. When a battery cell 8 experiences thermal runaway, the explosion-proof valve at the bottom of the battery cell 8 opens, and the high-temperature ejecta causes the pressure in the through hole 21 to increase. At this time, the high-temperature ejecta containing solids and gases are ejected downward under the action of the violent explosion force, enter the guide platform 31 from the through hole 21, and are guided into the guide channel 32 under the guidance of the guide platform 31. The arc-shaped barrier fins 41 isolate the high-temperature ejecta so that the high-temperature ejecta will not diffuse into the entire battery pack, thereby preventing the occurrence of thermal diffusion; and the arc-shaped barrier fins 41 also guide the movement of the high-temperature ejecta so that the high-temperature ejecta can be quickly guided to the outside of the battery pack and sprayed to the ground, so that the high-temperature ejecta diffuses away from the vehicle body.

[0053] Furthermore, the explosion-proof system of the battery pack of the present invention further includes a control component, which is used to detect whether the battery cell 8 has thermal runaway. When a battery cell 8 has thermal runaway, the control component can detect that the battery cell 8 has thermal runaway. At this time, the control component promptly issues an alarm to remind the driver and passengers, thus solving the problems of slow alarm and alarm failure in traditional battery packs using smoke sensors.

[0054] The present invention arranges a plurality of through holes 21 on the cell tray 2, the fixed shell 1 is arranged at the bottom of the cell tray 2, and a gap exists between the fixed shell 1 and the cell tray 2; and arranges a guide platform 31 at the bottom of the through holes 21, the fixed shell 1 is arranged at the bottom of the cell tray 2, a guide channel 32 is formed between the fixed shell 1 and the cell tray 2, and the guide channel 32 is respectively connected to the through holes 21 and the guide platform 31. When thermal runaway occurs, high-temperature ejecta containing solids and gases are ejected downward from the through hole 21 under the action of severe explosion force, and are introduced into the guide channel 32 from the guide platform 31, so as to prevent the high-temperature ejecta from gathering in the same direction and causing the temperature of other battery cells in the local area to be too high, thereby causing the problem of heat diffusion; then, the high-temperature ejecta is sprayed to the ground through the guide channel 32, so that the high-temperature ejecta is diffused away from the vehicle body. The present invention prevents the high-temperature ejecta from causing secondary damage to other components such as pipelines on both sides of the battery pack, and at the same time prevents the high-temperature ejecta from being close to the bottom plate of the passenger compartment, causing the bottom plate of the passenger compartment to heat up too quickly, causing harm to the people in the vehicle.

[0055] Furthermore, the present invention arranges arc-shaped barrier fins 41 at even intervals at the bottom of the cell tray 2 , and isolates and guides the high-temperature ejected matter through the arc-shaped barrier fins 41 , thereby preventing heat diffusion.

[0056] In one embodiment of the explosion-proof system of the battery pack of the present invention, Figure 2 As shown, the guide platform 31 is a circular ring structure, and the guide platform 31 extends from the bottom of the through hole 21 to the guide channel 32.

[0057] The inner wall of the guide platform 31 is inclined, and the angle between the inner wall of the guide platform 31 and the axis of the through hole 21 is 5-20 degrees.

[0058] Specifically, the guide platform 31 extends from the bottom of the through hole 21 in the direction of the guide channel 32, and the inner wall of the guide platform 31 is inclined. The angle between the inner wall of the guide platform 31 and the axis of the through hole 21 is 5 to 20 degrees. Under the guidance of the guide platform 31, the high-temperature ejecta can be diffused in all directions after being introduced into the guide channel 32, thereby avoiding the problem of high-temperature ejecta gathering in the same direction when being ejected into the guide channel 32. The battery pack explosion-proof guide device of the present invention has higher safety performance and can meet the requirement of zero diffusion during thermal runaway.

[0059] In one embodiment of the explosion-proof system of the battery pack of the present invention, Figure 2 As shown, an anti-slip groove 22 is also provided inside the through hole 21. The anti-slip groove 22 is located above the guide platform 31, and the inner diameter of the anti-slip groove 22 is smaller than the inner diameter of the through hole 21. The inner diameter of the anti-slip groove 22 is larger than the inner diameter of the guide platform 31, and the bottom of the battery cell 8 abuts against the top of the anti-slip groove 22.

[0060] The present invention positions the anti-slip groove 22 above the guide platform 31, and the inner diameter of the anti-slip groove 22 is smaller than the inner diameter of the through hole 21, and the inner diameter of the anti-slip groove 22 is larger than the inner diameter of the guide platform 31. The bottom of the battery cell 8 abuts against the top of the anti-slip groove 22, so that the anti-slip groove 22 can provide support for the battery cell 8, avoid the problem of the heat insulation component 9 falling off, and improve safety and reliability.

[0061] In one embodiment of the explosion-proof system of the battery pack of the present invention, Figures 1 to 8 As shown, the flow guide assembly 3 also includes a flow guide cover 33, which is arranged on the side wall of the fixed shell 1 and is inclined toward the ground. The flow guide channel 32 is connected to the through hole 21, the flow guide platform 31 and the flow guide cover 33 respectively.

[0062] The first end of the air guide cover 33 is connected to the fixed shell 1, and an air guide hole 34 is arranged inside the air guide cover 33. The air guide hole 34 is a trapezoidal structure, and the aperture of the air guide hole 34 gradually increases from the first end of the air guide cover 33 to the second end of the air guide cover 33.

[0063] The present invention connects the first end of the air deflector 33 to the fixed shell 1, and sets a guide hole 34 inside the air deflector 33. The guide hole 34 is a trapezoidal structure, and the aperture of the guide hole 34 is gradually increased from the first end of the air deflector 33 to the second end of the air deflector 33, so that the air deflector 33 and the guide hole 34 are both in the shape of a trumpet mouth, so that the high-temperature ejected matter is guided out of the battery pack from the guide hole 34 and guided to the ground through the air deflector 33, thereby preventing the high-temperature ejected matter from causing secondary damage to other components such as the pipelines on both sides of the battery pack, and at the same time preventing the ejected matter from being close to the bottom plate of the passenger compartment, causing the bottom plate of the passenger compartment to heat up too quickly and cause harm to the people in the vehicle.

[0064] In one embodiment of the explosion-proof system of the battery pack of the present invention, in order to improve the heat insulation and guiding effects of the arc-shaped barrier fins 41, the arc-shaped barrier fins 41 are extended along the width direction of the battery cell tray 2, the length of the arc-shaped barrier fins 41 is less than or equal to the width of the battery cell tray 2, and the arc-shaped barrier fins 41 are evenly spaced along the length direction of the battery cell tray 2.

[0065] In one embodiment of the explosion-proof system of the battery pack of the present invention, Figures 1 to 10 As shown, an intermediate fixed beam 11 and a fixed frame 12 are provided on the fixed shell 1, the intermediate fixed beam 11 is located in the middle of the fixed shell 1, the fixed frame 12 is located on the side wall of the fixed shell 1, and the intermediate fixed beam 11 and the fixed frame 12 are both connected to the bottom of the battery cell tray 2.

[0066] The fixing frame 12 is provided with a connecting hole 13 , which is communicated with the guide channel 32 .

[0067] Specifically, there are a plurality of air guide covers 33 , and the plurality of air guide covers 33 are respectively arranged at intervals along the width of the fixing frame 12 .

[0068] The present invention positions the middle fixed beam 11 in the middle of the fixed shell 1, positions the fixed frame 12 on the side wall of the fixed shell 1, and connects the middle fixed beam 11 and the fixed frame 12 to the bottom of the battery cell tray 2, and connects the connecting hole 13 to the guide channel 32, so that the high-temperature ejecta is discharged from the connecting hole 13 through the guide channel 32. While ensuring the installation stability of the middle fixed beam 11 and the fixed frame 12, the rate of leading out the high-temperature ejecta is improved.

[0069] Furthermore, a guide hole 14 is correspondingly provided on the middle fixed beam 11 , and the high-temperature ejected matter can also be introduced into the outside of the fixed shell 1 through the guide hole 14 , further improving the rate of leading out the high-temperature ejected matter.

[0070] In addition, a fixing block 7 is provided on the outer peripheral wall of the fixing frame 12 , and the fixing block 7 is provided with a threaded hole, and the housing 1 is fixed by installing a fastening bolt on the threaded hole.

[0071] Specifically, the fixing blocks 7 are arranged at intervals along the width direction of the fixing frame 12 , and the fixing blocks 7 and the air guide covers 33 are arranged alternately in sequence.

[0072] In one embodiment of the explosion-proof system of the battery pack of the present invention, Figure 1 As shown, the heat insulation assembly 4 further includes a mica heat insulation sheet 42, which is respectively connected to the middle fixed beam 11 and the fixed frame 12, and the mica heat insulation sheet 42 blocks the connection hole 13. Since the mica heat insulation sheet 42 is resistant to high temperatures, it can effectively prevent heat diffusion.

[0073] In one embodiment of the explosion-proof system of the battery pack of the present invention, Figures 1 to 8 As shown, the explosion-proof device of the battery cell 8 further includes an explosion-proof vent valve 6 , which is disposed in the connecting hole 13 .

[0074] When the pressure of the explosion-proof vent valve 6 is high, the explosion-proof vent valve 6 is pushed open, and the high-temperature ejection enters the connecting hole 13 from the guide channel 32 and is ejected from the connecting hole 13 to the ground, so that the high-temperature ejection is diffused away from the vehicle body.

[0075] In one embodiment of the explosion-proof system of the battery pack of the present invention, Fig. 9 As shown, a heat insulating member 9 is poured into the through hole 21 , and the heat insulating member 9 wraps the battery cell 8 .

[0076] Specifically, the thermal insulation 9 can be realized by pouring thermal insulation glue, or it can be directly assembled with mica sheets, aerogels and other components. It mainly provides thermal insulation and short-circuit protection for the bottom of the battery cell 8. The thermal insulation is resistant to high temperatures and not resistant to impact. It will be broken under the impact force and has certain insulation properties.

[0077] In one embodiment of the explosion-proof system of the battery pack of the present invention, Figures 1 to 8 As shown, the control component includes multiple aluminum wires 5, sensors, controllers and alarms. The aluminum wires 5 are extended along the length direction of the battery cell tray 2 and coincide with the centers of multiple through holes 21. The multiple aluminum wires 5 are sequentially arranged on the through holes 21 along the width direction of the battery cell tray 2; the sensors are electrically connected to the aluminum wires 5 for detecting current or voltage changes of the aluminum wires 5.

[0078] The controller is connected to the sensor and the alarm respectively. The controller is used to receive data information transmitted by the sensor and control the alarm to sound an alarm.

[0079] It should be noted that the sensor and alarm of the present invention are common devices in the prior art and will not be described here.

[0080] Since the battery pack using large-size, high-nickel cylindrical cells has high energy, the risk of harm when thermal runaway occurs is high. In order to monitor thermal runaway as soon as possible and provide reliable signals, an aluminum wire 5 is arranged at the bottom of the battery cell 8. When thermal runaway occurs, the temperature of the high-temperature ejecta is high and will melt the aluminum wire 5. At this time, the controller can quickly detect changes in the voltage or current of the aluminum wire 5 and transmit the data signal to the controller. The controller controls the alarm to sound an alarm to remind the driver and passengers, which solves the problems of slow alarm and alarm failure caused by smoke sensors in traditional battery packs, and effectively improves the safety of the driver and passengers.

[0081] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An explosion-proof system for a battery pack, characterized in that: include: Battery cells, cell trays, fixed housings, thermal insulation components and flow guide components; The battery tray is provided with a plurality of through holes for installing battery cells; the fixed shell is arranged at the bottom of the battery tray, and there is a gap between the fixed shell and the battery tray; The flow guide component is used to guide the high-temperature ejected matter in the through hole to the outside of the fixed shell; the flow guide component includes a flow guide platform and a flow guide channel, the flow guide platform is arranged at the bottom of the through hole, the fixed shell is arranged at the bottom of the battery tray, the flow guide channel is formed between the fixed shell and the battery tray, and the flow guide channel is communicated with the through hole and the flow guide platform respectively; The heat insulation component is arranged at the bottom of the battery cell tray to separate the battery cells; the heat insulation component includes arc-shaped barrier fins, and the arc-shaped barrier fins are evenly spaced and arranged at the bottom of the battery cell tray.

2. The explosion-proof system of the battery pack according to claim 1, characterized in that: The guide platform is a circular ring structure, and the guide platform extends from the bottom of the through hole to the guide channel; The inner wall of the guide platform is inclined, and the angle between the inner wall of the guide platform and the axis of the through hole is 5 to 20 degrees.

3. The explosion-proof system of the battery pack according to claim 1, characterized in that: An anti-slip groove is also provided inside the through hole, the anti-slip groove is located above the guide platform, and the inner diameter of the anti-slip groove is smaller than the inner diameter of the through hole, and the inner diameter of the anti-slip groove is larger than the inner diameter of the guide platform, and the bottom of the battery cell abuts against the top of the anti-slip groove.

4. The explosion-proof system of the battery pack according to claim 1, characterized in that: The flow guide assembly further includes a flow guide cover, which is arranged on the side wall of the fixed shell and is arranged to be inclined toward the ground, and the flow guide channel is respectively connected with the through hole, the flow guide platform and the flow guide cover; The first end of the air guide cover is connected to the fixed shell, and an air guide hole is arranged inside the air guide cover. The air guide hole is a trapezoidal structure, and the aperture of the air guide hole gradually increases from the first end of the air guide cover to the second end of the air guide cover.

5. The explosion-proof system of the battery pack according to claim 1, characterized in that: The arc-shaped barrier fins are extended along the width direction of the battery cell tray, the length of the arc-shaped barrier fins is less than or equal to the width of the battery cell tray, and the arc-shaped barrier fins are evenly spaced along the length direction of the battery cell tray.

6. The explosion-proof system of the battery pack according to claim 1, characterized in that: The fixed shell is provided with an intermediate fixed beam and a fixed frame, wherein the intermediate fixed beam is located in the middle of the fixed shell, the fixed frame is located on the side wall of the fixed shell, and the intermediate fixed beam and the fixed frame are both connected to the bottom of the battery tray; The fixing frame is provided with a connecting hole, and the connecting hole is communicated with the guide channel.

7. The explosion-proof system of the battery pack according to claim 6, characterized in that: The thermal insulation assembly also includes a mica thermal insulation sheet, which is respectively connected to the middle fixed beam and the fixed frame, and the mica thermal insulation sheet blocks the connection hole.

8. The explosion-proof system of the battery pack according to claim 7, characterized in that: The explosion-proof device of the battery cell further comprises an explosion-proof vent valve, and the explosion-proof vent valve is arranged in the connecting hole.

9. The explosion-proof system of the battery pack according to claim 1, characterized in that: A heat insulating member is poured into the through hole, and the heat insulating member wraps the battery core.

10. The explosion-proof system of the battery pack according to claim 1, characterized in that: The explosion-proof system of the battery pack further includes a control component, which includes a plurality of aluminum wires, a sensor, a controller and an alarm, wherein the aluminum wires are extended along the length direction of the battery tray and coincide with the centers of the plurality of through holes, and the plurality of aluminum wires are sequentially arranged on the through holes along the width direction of the battery tray; the sensor is electrically connected to the aluminum wire and is used to detect current or voltage changes of the aluminum wire; The controller is connected to the sensor and the alarm respectively, and is used to receive data information transmitted by the sensor and control the alarm to sound an alarm.

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