High-power-density flame-proof motor

Abstract

The invention relates to the technical field of motors, in particular to a high-power-density flame-proof motor which comprises a motor body, the motor body is sleeved with a pressure covering film, a fixing ring is fixedly installed on the motor body, and the pressure covering film is fixedly connected with the fixing ring. The motor body is provided with a pressure covering film, the pressure covering film is provided with a pressure relief seam, the pressure relief seam is arranged at the part, not opposite to the battery pack, of the pressure covering film, the motor body is sleeved with a guide sleeve, the motor body is fixedly provided with a fixing ring, and the guide sleeve is arranged on the fixing ring; the pressure covering film is arranged on the outer side of the guide sleeve in a sleeving mode, a guide groove is formed in the guide sleeve, the guide sleeve comprises a plurality of guide rings and a plurality of elastic bands, and the multiple guide rings are sequentially arranged on the motor body in a sleeving mode. The problem that the vehicle-mounted battery pack is affected when the motor of the electric vehicle explodes is solved, and the safety performance of the electric vehicle is improved.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, specifically to a high power density explosion-proof electric motor. Background Technology

[0002] Electric motors are the core power components in various electric drive devices, playing a crucial role, especially in industrial and special applications requiring high power density and compact layout. For example, the technical document with publication number CN105680612A, entitled "Low-Noise Permanent Magnet Motor for New Energy Vehicles," showcases one such motor type.

[0003] In high-power-density motor design, to meet the requirements of system miniaturization and lightweighting, the motor is usually tightly arranged with other electrical components in a limited space. While this compact installation method increases the overall power density of the system, it also increases safety hazards. Specifically, when an internal short circuit occurs in the motor due to aging, vibration, or other factors, the fault point may generate a high-temperature arc within a very short time, accompanied by a sudden increase in local pressure. This can ignite the surrounding insulating medium, cooling oil, or other flammable materials, and may even cause a local deflagration, posing a direct threat to the structural integrity of the motor itself and adjacent equipment.

[0004] Currently, most common motor designs rely on external electrical system monitoring and protection to handle such faults. However, at the motor's structural level, there is a lack of protective mechanisms to actively divert pressure and high-temperature flames when a fault occurs. Especially in high-power-density integrated layouts, the absence of such structural protection may lead to a wider range of fault impact, resulting in more severe equipment damage. Therefore, how to improve the self-protection capability of motors under extreme electrical faults and prevent fault propagation from the perspective of motor design has become a pressing technical problem that needs to be solved in the field of motor structural design.

[0005] Therefore, a high power density explosion-proof electric motor is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a high power density explosion-proof electric motor to solve the problem that the electric motor of an electric vehicle may affect the vehicle battery pack in the event of an explosion, thereby improving the safety performance of electric vehicles.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A high power density explosion-proof electric motor includes a motor body, a pressure diaphragm fitted on the motor body, a fixing ring fixedly installed on the motor body, and the pressure diaphragm being fixedly connected to the fixing ring; a pressure relief seam is provided on the pressure diaphragm, and the pressure relief seam is located on the part of the pressure diaphragm that is not opposite to the battery pack.

[0008] Based on this design, when the motor body is operating normally, the pressure liner adheres tightly to the motor body, minimizing its impact on the design volume of the electric vehicle's motor. However, in the event of an explosion, the resulting pressure shock and flames are initially contained within the pressure liner. The liner then expands under pressure, creating a gap between it and the motor body. The pressurized gas and flames flow along this gap and are guided to a pressure relief vent located at a specific position, finally bursting through the vent and being released outwards. Since the pressure relief vent is located away from the battery pack, the released pressure and flames do not propagate towards the battery pack, preventing impact or damage from the explosion and protecting the battery pack from the blast wave, thus improving the safety of the electric vehicle.

[0009] Preferably, a guide sleeve is fitted onto the motor body, a fixing ring is fixedly installed on the motor body, and the guide sleeve is disposed on the fixing ring; the pressure diaphragm is fitted onto the outside of the guide sleeve, and a guide groove is provided on the guide sleeve.

[0010] With this configuration, the pressurized gas generated during the motor explosion will contact the pressure membrane under the guidance of the guide groove. During this process, the guide groove can change the direction of movement of the pressurized gas, thereby changing the velocity direction of the pressurized gas to a direction parallel to the surface of the pressure membrane. Thus, at the point of contact with the pressure membrane, the pressurized gas has a force component along the normal direction of the pressure membrane and a force component along the surface direction of the pressure membrane. The force component along the surface direction of the pressure membrane helps to change the direction of the pressurized gas and the flame, allowing the pressurized gas to smoothly change its direction of travel and reach the pressure relief seam along the guide of the pressure membrane to complete the pressure relief. Furthermore, this also reduces the direct impact of the pressurized gas generated during the motor explosion on the pressure membrane in the normal direction, thereby helping to avoid damage to the pressure membrane caused by excessive local pressure impact, thus improving the service life of the pressure membrane and enhancing the reliability of the invention, helping to ensure the successful implementation of the invention's functions.

[0011] Preferably, the guide sleeve includes multiple guide rings and multiple elastic bands. The multiple guide rings are sequentially sleeved on the motor body, and adjacent guide rings are connected by elastic bands; the gap between adjacent guide rings forms a guide groove.

[0012] This design, utilizing the elasticity of the elastic band, gives the guide sleeve a certain degree of flexibility. Therefore, when the motor explodes, the pressurized gas generated during the explosion will first cause the guide sleeve to deform, widening the gap between the guide sleeve and the motor body. This allows the pressurized gas to move along this widened gap. Consequently, the pressurized gas and flame, which were originally concentrated in one guide slot, can diffuse outwards along this gap, allowing more guide slots to be used for guiding and releasing this pressurized gas. This helps reduce the working pressure of a single guide slot, improves the efficiency of guiding flames and pressurized gas, facilitates rapid pressure relief to reduce the workload of the pressure diaphragm, and protects the pressure diaphragm from damage during operation. This ensures that the impact and flame generated during the motor explosion can be guided by the pressure diaphragm to the specific location of the pressure relief seam for release, thus improving the reliability of the invention.

[0013] Preferably, the guide ring is provided with a protrusion and a recess, and the protrusion on one guide ring is used to cooperate with the recess on another adjacent guide ring to form a guide groove; the protrusion protrudes in the direction of the output shaft of the motor body, and the recess is recessed in the direction of the output shaft of the motor body.

[0014] This design, utilizing adjacent protrusions and recesses to form a guide groove, allows the guide groove to have an arc shape. This ensures that the pressure gas and flame do not only change direction upon entering the guide groove, but also change direction as they move within it. Therefore, the space within the guide groove can be fully utilized to allow for a greater angle of change in the velocity direction of the pressure gas and flame. This allows the velocity direction to be changed more parallel to the surface of the pressure coating, further reducing the direct impact of the pressure gas generated during an explosion on the pressure coating in the normal direction. This helps prevent damage to the pressure coating caused by excessive localized pressure impact, thus extending the service life of the pressure coating and improving the reliability of the invention, ensuring the successful implementation of its functions.

[0015] Preferably, the elastic band includes a first connecting part, a second connecting part, and an elastic part; the first connecting part is fixedly installed on the recess of a guide ring, the second connecting part is fixedly installed on the protrusion of an adjacent guide ring, and the elastic part is connected to the first connecting part and the second connecting part respectively; the first connecting part is away from the motor body, and the second connecting part is close to the motor body.

[0016] With this configuration, the elastic bands will be positioned at an angle between two adjacent guide rings, and the two elastic bands on a single guide ring will apply force at different points. When the pressurized gas generated by the motor explosion impacts the guide ring, the elasticity of the pressure diaphragm and the elasticity of the elastic rope will work together to attempt to balance the impact force of the pressurized gas. At this time, the impacted guide ring is pushed outward, and because the two elastic bands apply force at different points, the guide ring will flip to achieve a balanced state, thereby causing the guide ring to open outward within the allowable range of elasticity. Specifically, the gap between the concave portion of the guide ring and the protrusion of the corresponding, adjacent guide ring is widened, i.e., the width of the guide groove is increased. Therefore, the pressurized gas and flames accumulated at the impacted local location can be guided and discharged more quickly, improving the response speed of the invention.

[0017] Preferably, a connecting groove is formed on the inner wall of the pressure diaphragm, and the connecting groove is arranged along the axial direction of the output shaft of the motor body.

[0018] This design allows for a stable communication space between the pressure diaphragm and the motor body, facilitating the rapid flow of pressurized gas to the pressure relief seam in the event of a motor explosion. Furthermore, when the guide ring flips under the impact of pressurized gas, the tightness of the contact between the guide ring and the pressure diaphragm increases, making it more difficult for gas to pass through the gap between them, potentially hindering the smooth flow of pressurized gas within the pressure diaphragm. However, by providing the communication channel, a gas flow path is always maintained between the guide ring and the pressure diaphragm, thus ensuring the directional release of pressurized gas function of this invention.

[0019] Preferably, the pressure membrane is provided with an end cap, and the pressure relief seam is opened on the end cap; multiple pressure relief seams are evenly and symmetrically opened on the end cap, and the multiple pressure relief seams are arranged in a star-shaped pattern with the center of the end cap as the center.

[0020] This design allows the pressure relief seam to extend to the connection between the motor body end cover and the side plate via a star-shaped, diverging arrangement. At this connection, there is a large-angle bend, resulting in high resistance to gas flow and making it difficult for pressurized gas to escape in a timely manner. This leads to increased pressure buildup inside the pressure diaphragm, potentially causing it to rupture under excessive pressure. This could result in gas leakage at the rupture point, which could still affect the battery pack. This new design, however, allows the pressure relief seam to extend directly to the connection between the motor body end cover and the side plate. Therefore, pressurized gas will escape directly through the seam at this point, preventing accumulation and allowing for timely pressure release within the pressure diaphragm. This helps prevent damage to the pressure diaphragm during operation and improves the reliability of the invention.

[0021] Preferably, the pressure relief joint is provided with an auxiliary part, which is located on the outward diverging end of the star-shaped pressure relief joint.

[0022] With this design, the overall shape of the pressure relief slot is T-shaped, with two corresponding petal-like structures. When pressurized gas attempts to breach the pressure relief slot, the two petal-like structures open outwards at the intersection of the T-shape, allowing the pressurized gas to more easily pass through the slot, thus achieving rapid pressure release and preventing damage to the pressure diaphragm due to excessive internal pressure. Simultaneously, when the motor body is operating normally without an explosion, the petal-like structures of the pressure relief slot remain closed to prevent external debris from entering the area where the motor body is located, thereby extending the lifespan of the motor body.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, when the motor body explodes, utilizes the guiding effect of the pressure diaphragm to direct the pressurized gas and flames generated by the explosion to a pressure relief seam located at a specific position, ultimately releasing them outwards through the seam. Since the pressure relief seam is located in a part not opposite to the battery pack, the released pressure and flames will not spread towards the electric vehicle's battery pack, thus preventing the pressure and flames generated during the motor explosion from impacting or damaging the battery pack. This helps protect the battery pack from the blast wave of the motor, thereby improving the safety of the electric vehicle.

[0024] 2. By setting up a guide sleeve and a guide groove, the pressurized gas generated during the motor explosion will come into contact with the pressure diaphragm under the guidance of the guide groove. This allows the pressurized gas to smoothly change its direction of travel and reach the pressure relief seam along the pressure diaphragm to complete the pressure relief. Furthermore, this also reduces the direct impact of the pressurized gas generated during the motor explosion on the pressure diaphragm in the normal direction, thus helping to avoid damage to the pressure diaphragm caused by excessive local pressure impact. This, in turn, helps to improve the service life of the pressure diaphragm and enhances the reliability of the invention, contributing to the successful realization of its functions.

[0025] 3. By incorporating guide rings and elastic bands, the overall structure of the guide sleeve possesses a certain degree of flexibility. Therefore, when the motor explodes, the pressurized gas and flames, originally concentrated in one guide slot, can diffuse to the surrounding area through the elastic deformation of the guide sleeve. This allows more guide slots to be used for guiding and releasing these pressurized gases. This helps reduce the working pressure of a single guide slot, improves the guiding efficiency of the invention, facilitates rapid pressure relief to reduce the workload of the pressure membrane, and thus helps protect the pressure membrane from damage during operation, improving the reliability of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Rear view diagram; Figure 3 for Figure 2 A magnified view of part A in the middle; Figure 4 for Figure 3 A structural diagram showing the pressure relief joint in the open position; Figure 5 This is a schematic diagram of the planar cross-section structure of the present invention; Figure 6 for Figure 5 A magnified view of part B in the middle section; Figure 7 for Figure 6 A schematic diagram showing the state of the guide ring when it is pushed and flipped by pressurized gas. Figure 8 This is a schematic diagram showing the relationship between the surface orientation of the pressure coating and the guiding direction of the guide groove.

[0027] In the diagram: 1. Motor body; 2. Pressure diaphragm; 3. Fixing ring; 4. Guide sleeve; 5. Crack caused by motor explosion; 6. Surface direction of pressure diaphragm; 7. Guiding direction of guide groove; 21. Pressure relief seam; 22. Auxiliary part; 23. Connecting groove; 24. End cap part; 41. Guide groove; 42. Guide ring; 43. Elastic band; 44. Fixing ring; 421. Protrusion; 422. Recess; 431. Connecting part one; 432. Connecting part two; 433. Elastic part. Detailed Implementation

[0028] The following description, with the aid of the accompanying drawings listed in the foregoing "Description of Drawings", will clearly illustrate the specific embodiments of the present invention, in order to enable readers to have a more complete and objective understanding of the working principle and corresponding technical effects of the present invention.

[0029] like Figures 1 to 8The figure illustrates a specific embodiment of the present invention. Several points need to be explained beforehand: First, the dimensions of the components are exaggerated in the accompanying drawings to highlight technical features. In actual application, to ensure the guide ring 42 has sufficient elasticity to deform during operation, it can be made into a thin sheet. Second, connecting components such as flanges can be fixedly installed at both ends of the motor body 1 to meet the connection requirements between the present invention and other components. Third, the output shaft of the electric vehicle motor is parallel to the axle; therefore, the pressure relief seam 21 is located at the rear of the motor body 1. Thus, the pressurized gas and flame discharged from the pressure relief seam 21 will be parallel to the axle, preventing them from affecting the vehicle battery pack. Fourth, the pressure diaphragm 2 needs to be elastic and able to withstand the high temperature of the flame for a certain period; therefore, it can be made of rubber.

[0030] When installing this invention, first remove the motor body 1, and then fit a pressure diaphragm 2 onto the motor body 1. A fixing ring 3 is fixedly installed on the motor body 1, and the pressure diaphragm 2 is fixedly connected to the fixing ring 3. A pressure relief slit 21 is provided on the pressure diaphragm 2, and the pressure relief slit 21 is located on the part of the pressure diaphragm 2 that is not opposite to the battery pack. A guide sleeve 4 is fitted onto the motor body 1, and a fixing ring 44 is fixedly installed on the motor body 1. The guide sleeve 4 is placed on the fixing ring 44. The pressure diaphragm 2 is fitted on the outside of the guide sleeve 4, and the guide sleeve 4 is provided with a guide groove 41.

[0031] The guide sleeve 4 includes multiple guide rings 42 and multiple elastic bands 43. The guide rings 42 are sequentially sleeved on the motor body 1, and adjacent guide rings 42 are connected by elastic bands 43. The gap between two adjacent guide rings 42 forms a guide groove 41. The guide rings 42 are provided with protrusions 421 and recesses 422. The protrusions 421 on one guide ring 42 are used to cooperate with the recesses 422 on another adjacent guide ring 42 to form the guide groove 41. The protrusions 421 protrude towards the output shaft of the motor body 1, and the recesses 422 are recessed towards the output shaft of the motor body 1.

[0032] The elastic band 43 includes a first connecting part 431, a second connecting part 432, and an elastic part 433. The first connecting part 431 is fixedly installed on the recess 422 of a guide ring 42, and the second connecting part 432 is fixedly installed on the protrusion 421 of another adjacent guide ring 42. The elastic part 433 is connected to the first connecting part 431 and the second connecting part 432 respectively. The first connecting part 431 is away from the motor body 1, and the second connecting part 432 is close to the motor body 1.

[0033] In addition, a connecting groove 23 is provided on the inner wall of the pressure diaphragm 2, and the connecting groove 23 is arranged along the axis of the output shaft of the motor body 1. An end cap 24 is provided on the pressure diaphragm 2, and a pressure relief slit 21 is provided on the end cap 24; multiple pressure relief slits 21 are evenly and symmetrically provided on the end cap 24, and the multiple pressure relief slits 21 are arranged in a star-shaped divergence with the center of the end cap 24 as the center. An auxiliary part 22 is provided on the pressure relief slit 21, and the auxiliary part 22 is provided on the outward diverging end of the star-shaped diverging pressure relief slit 21.

[0034] When this invention is in operation, if the motor body 1 is functioning normally, the pressure diaphragm 2 adheres tightly to the motor body 1, thereby minimizing the impact of the pressure diaphragm 2 on the design volume of the electric vehicle's motor. However, when the motor body 1 explodes, the resulting pressure shock and flames are initially contained within the pressure diaphragm 2. Subsequently, the pressure diaphragm 2 expands under pressure, creating a gap between the pressure diaphragm 2 and the motor body 1. The pressurized gas and flames generated by the explosion flow along this gap and are guided to the pressure relief slit 21 located at a specific position, finally breaking through the slit 21 and being released outwards. Since the pressure relief slit 21 is located in a part not opposite to the battery pack, the released pressure and flames will not diffuse towards the electric vehicle's battery pack, thus preventing the pressure and flames generated during the motor explosion from impacting or damaging the battery pack. This helps protect the battery pack from the blast wave of the motor, thereby improving the safety of the electric vehicle.

[0035] Through the guide sleeve 4 and guide groove 41, the pressurized gas generated during the motor explosion will come into contact with the pressure membrane 2 under the guidance of the guide groove 41. During this process, the guide groove 41 can change the movement direction of the pressurized gas, thereby changing the velocity direction of the pressurized gas to a direction parallel to the surface direction of the pressure membrane 2. Thus, at the contact point with the pressure membrane 2, the pressurized gas has a component force along the normal direction of the pressure membrane 2 and a component force along the surface direction of the pressure membrane 2. Among them, the component force along the surface direction of the pressure membrane 2 will help the pressurized gas and the flame change direction, thereby enabling the pressurized gas to smoothly change its direction of travel and reach the pressure relief seam 21 along the guidance of the pressure membrane 2 to complete the pressure relief. In addition, this can also reduce the direct impact of the pressurized gas generated during the motor explosion on the pressure membrane 2 in the normal direction, thereby helping to avoid damage to the pressure membrane 2 caused by excessive local pressure impact, thus improving the service life of the pressure membrane 2, and also improving the reliability of the invention, helping to ensure the smooth realization of the function of the invention.

[0036] It is worth noting that, in the guide sleeve 4, the elasticity of the elastic band 43 gives the overall structure of the guide sleeve 4 a certain degree of flexibility. Therefore, when the motor explodes, the pressurized gas generated during the explosion will first push the guide sleeve 4 to deform, thereby widening the gap between the guide sleeve 4 and the motor body 1, allowing the pressurized gas to move along this widened gap. Thus, the pressurized gas and flame, which were originally concentrated in one guide slot 41, can diffuse outwards along this gap, allowing more guide slots 41 to be used for guiding and releasing these pressurized gases. This helps reduce the working pressure of a single guide slot 41, improves the guiding efficiency of the flame and pressurized gas, facilitates rapid pressure relief to reduce the workload of the pressure diaphragm 2, and helps protect the pressure diaphragm 2 from damage during operation. This ensures that the impact and flame generated during the motor explosion can be guided by the pressure diaphragm 2 to a specific location in the pressure relief seam 21 for release, improving the reliability of the invention.

[0037] Furthermore, by utilizing the protrusions 421 and recesses 422 of adjacent guide rings 42 to form the guide groove 41, the guide groove 41 can possess an arc-shaped shape. This ensures that the pressure gas and flame do not only change direction upon entering the guide groove 41, but also change direction during their movement within the guide groove 41. Consequently, the space within the guide groove 41 can be fully utilized to allow for a greater angle change in the velocity direction of the pressure gas and flame. This allows the velocity direction to be changed more parallel to the surface direction of the pressure coating 2, further reducing the direct impact of the pressure gas generated during the motor explosion on the pressure coating 2 in the normal direction. This helps prevent damage to the pressure coating 2 caused by excessive local pressure impact, thereby increasing the service life of the pressure coating 2 and improving the reliability of the invention, thus ensuring the successful implementation of the invention's functions.

[0038] Additionally, see Figure 7The elastic band 43 is positioned at an angle between two adjacent guide rings 42, and the two elastic bands 43 on a single guide ring 42 apply force to the guide ring 42 at different points. When the pressurized gas generated by the motor explosion impacts the guide ring 42, the elasticity of the pressure diaphragm 2 and the elasticity of the elastic rope work together to try to balance the impact force of the pressurized gas. At this time, the guide ring 42 is pushed outward by the pressurized gas and flame ejected from the crack 5 generated by the motor explosion. Because the two elastic bands 43 apply force to the guide ring 42 at different points, the guide ring 42 will flip in order to achieve a balanced state, thereby causing the guide ring 42 to open outward within the elastic allowable range. Specifically, the gap between the recessed portion 422 of the guide ring 42 and the protrusion 421 of the corresponding adjacent guide ring 42 is widened, that is, the width of the guide groove 41 is increased. Therefore, the pressurized gas and flame accumulated at the impacted local location can be guided and discharged more quickly, improving the response speed of the present invention.

[0039] It should be emphasized that, based on the content described above, although the beneficial effects of the present invention have been explained in detail and corresponding specific embodiments have been provided, those skilled in the art can still achieve the same technical effects by making conventional substitutions, modifications, or other alterations to the given technical solutions without creative effort, provided they fully understand the working principle of the present invention. However, such modifications should not be considered as exceeding the scope of the present invention. Specifically, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high power density explosion-proof electric motor, comprising a motor body (1), characterized in that, A pressure diaphragm (2) is fitted on the motor body (1), and a fixing ring (3) is fixedly installed on the motor body (1). The pressure diaphragm (2) is fixedly connected to the fixing ring (3). A pressure relief seam (21) is provided on the pressure diaphragm (2), and the pressure relief seam (21) is located on the part of the pressure diaphragm (2) that is not opposite to the battery pack.

2. The high power density explosion-proof electric motor according to claim 1, characterized in that, The motor body (1) is fitted with a guide sleeve (4), and a fixing ring (44) is fixedly installed on the motor body (1). The guide sleeve (4) is set on the fixing ring (44). The pressure membrane (2) is fitted on the outside of the guide sleeve (4), and a guide groove (41) is provided on the guide sleeve (4).

3. A high power density explosion-proof electric motor according to claim 2, characterized in that, The guide sleeve (4) includes multiple guide rings (42) and multiple elastic bands (43). The multiple guide rings (42) are sequentially sleeved on the motor body (1), and two adjacent guide rings (42) are connected by elastic bands (43). The gap between two adjacent guide rings (42) forms a guide groove (41).

4. A high power density explosion-proof electric motor according to claim 3, characterized in that, The guide ring (42) is provided with a protrusion (421) and a recess (422). The protrusion (421) on one guide ring (42) is used to cooperate with the recess (422) on the adjacent guide ring (42) to form a guide groove (41). The protrusion (421) protrudes towards the output shaft of the motor body (1), and the recess (422) is recessed towards the output shaft of the motor body (1).

5. A high power density explosion-proof electric motor according to claim 4, characterized in that, The elastic band (43) includes a first connecting part (431), a second connecting part (432), and an elastic part (433); the first connecting part (431) is fixedly installed on the recess (422) of a guide ring (42), the second connecting part (432) is fixedly installed on the protrusion (421) of another adjacent guide ring (42), and the elastic part (433) is connected to the first connecting part (431) and the second connecting part (432) respectively; the first connecting part (431) is away from the motor body (1), and the second connecting part (432) is close to the motor body (1).

6. A high power density explosion-proof electric motor according to claim 5, characterized in that, A connecting groove (23) is provided on the inner wall of the pressure membrane (2), and the connecting groove (23) is arranged along the axial direction of the output shaft of the motor body (1).

7. A high power density explosion-proof electric motor according to claim 1, characterized in that, The pressure membrane (2) is provided with an end cap (24), and the pressure relief seam (21) is opened on the end cap (24); multiple pressure relief seams (21) are evenly and symmetrically opened on the end cap (24), and the multiple pressure relief seams (21) are arranged in a star-shaped divergence with the center of the end cap (24) as the center.

8. A high power density explosion-proof electric motor according to claim 7, characterized in that, An auxiliary part (22) is provided on the pressure relief seam (21), and the auxiliary part (22) is provided on the outward diverging end of the star-shaped pressure relief seam (21).

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