Patent Description:
Devices such as an inverter, a lithium battery product, an on-board charger (On Board Charger, OBC for short), and a motor control unit (Motor Control Unit, MCU for short) all have enclosed boxes, and devices such as a capacitor and/or an electrochemical cell are disposed in the boxes.

During use of a capacitor or an electrochemical cell, the capacitor may fail, or a valve of the electrochemical cell may be turned on. When the capacitor fails or the valve of the electrochemical cell is turned on, flammable gas is released. When the capacitor and/or the electrochemical cell are located in an enclosed box, the flammable gas released when the capacitor fails or the valve of the electrochemical cell is turned on is retained in the enclosed box. The flammable gas retained in the enclosed box may cause an explosion when encountering a fire source. The explosion may cause partial cracking (including an opening at a junction) of the box. In addition, when the explosion causes partial cracking of the box, fragments of the box that are generated due to the explosion and components such as screws on the box may fly around, causing personal injury.

In the related technology, a box structure is usually strengthened to prevent cracking of a box or cracking of a small opening when an explosion occurs inside the box, so as to prevent fragments of the box that are generated due to the explosion and components such as screws on the box from flying around.

However, the explosion inside the box may still cause large-area cracking of the box when the box structure is strengthened. <CIT> discloses a housing for a power electronic device comprises a tray for accommodating power electronic components and a cover for placing on the tray so that a closed housing is formed. The cover is fixed to the tray with a plurality of screws, wherein at least one of the screws is guided through a sleeve with deformation structures. <CIT> discloses an anti-explosion cell box, which comprises a box body and a cover body, wherein the upper end of the box body is opened; the cover body is matched with the open end of the box body; the cover body is arranged on the open end of the box body; the anti-explosion cell box further comprises an anti-explosion pressure relief mechanism; the anti-explosion pressure relief mechanism comprises a plurality of guide pillars respectively arranged on the sidewall of the box body along the vertical direction.

The present invention provides an inverter comprising a box and an electronic component according to claim <NUM>. Embodiments of the invention are set forth with the appended dependent claims. The invention as set forth with the appended claims addresses a technical problem that an explosion inside a box may still cause large-area cracking of the box when a box structure is strengthened.

To resolve the foregoing technical problem, embodiments of this application provide the following technical solutions.

An embodiment of this application provides a box suitable for housing an electronic component.

Beneficial effects of this embodiment of this application are as follows: The box provided in this embodiment of this application includes the box body and the cover for sealing the box body. The cover is fastened to the box body through the fastener of each explosion venting assembly. The sleeve covers the fastener of each explosion venting assembly. The sleeve has a linear buckling property, that is, the sleeve has the critical buckling load. When external load applied to the sleeve is greater than the critical buckling load of the sleeve, the sleeve is subject to buckling, and a bearing capacity of the sleeve decreases sharply. To be specific, rigidity of the sleeve decreases sharply, and deformation of the sleeve increases sharply. When the deformation of the sleeve is still in an unstable region (that is, the deformation of the sleeve is still in an elastic deformation stage), the sleeve can be restored if the external load applied to the sleeve is removed or the external load applied to the sleeve is reduced to be less than the critical buckling load of the sleeve. In this case, the rigidity of the sleeve increases sharply.

The explosion venting assemblies of the box provided in this embodiment of this application utilize the linear buckling property of the sleeves. When the cover is subject to an impact force from the inside of the box body, the impact force is transferred to the sleeves. When a force applied to a sleeve is greater than critical buckling load of the sleeve, the sleeve is compressed and deformed. When the impact force causes forces applied to some sleeves to exceed critical buckling load of the sleeves, the sleeves subject to the forces greater than the critical buckling load are compressed and deformed. Therefore, the cover in regions corresponding to the sleeves is separated from the box body. To be specific, an opening is formed between the box body and the cover in the regions corresponding to the sleeves. When the impact force causes forces applied to all sleeves to exceed critical buckling load of the sleeves, all the sleeves are compressed and deformed, so that the entire cover is separated from the box body. Because the entire cover is separated from the box body, relative deformation at all locations on the cover is small, so that overall deformation of the cover is small. Based on the linear buckling property of the sleeves, when the sleeve that is compressed and deformed due to the force is still in an elastic deformation stage, the impact force applied to the cover decreases, and a force transferred to the sleeve also decreases, and when a force applied to the sleeve is less than the critical buckling load of the sleeve, the sleeve that is compressed and deformed due to the force is restored, so that the cover separated from the box body re-seals the box body.

A case in which the cover is subject to an impact force from the inside of the box body is that an explosion occurs inside the box. When the explosion occurs at a location in an edge region inside the box body and the explosion is minor, an impact force caused by the explosion to the cover may cause only forces applied to some sleeves to exceed critical buckling load of the sleeves. In this case, the cover in regions corresponding to the sleeves is separated from the box body, so that an opening is formed in a local region between the cover and the box body to release high-pressure gas inside the box body. This implements timely explosion venting for the box, and reduces damage to the box when an explosion occurs inside the box. When the explosion is severe, the cover is subject to a large impact force, and forces applied to all sleeves are greater than critical buckling load of the sleeves. In this case, the entire cover is separated from the box body, so that a large opening is formed between the cover and the box body to quickly release high-pressure gas inside the box body. This implements timely explosion venting for the box, and reduces damage to the box when an explosion occurs inside the box. Based on the timely explosion venting for the box, the impact force caused by the explosion to the cover sharply decreases, and therefore external load applied to a sleeve when deformation of the sleeve is still in an unstable region (that is, the deformation of the sleeve is still in an elastic deformation stage) is reduced to be less than critical buckling load of the sleeve, so that the sleeve can be restored, and the cover re-seals the opening of the box body under the action of the restoration of the sleeve.

In the foregoing process, in an early stage of the explosion, the opening is formed between the cover and the box body for timely explosion venting, and in a late stage of the explosion, the impact force applied to the cover decreases sharply, the sleeve that is compressed and deformed due to the force is restored, and the cover re-seals the box body under the action of the sleeve. Therefore, after the explosion occurs inside the box, deformation of the cover and the box body is small, and there is no opening or only a quite small opening between the cover and the box body after the cover re-seals the box body. This improves explosion-proof performance of the box, reduces a probability of personal injury when the box experiences an explosion, and improves safety of using the box. In addition, when the box provided in this embodiment of this application experiences an explosion, after the cover is separated from the box body for explosion venting, the opening of the box body can be re-sealed, so that there is no opening or only a quite small opening between the cover and the box body, and the box can still be used after experiencing the explosion. This reduces replacement costs of the box. In addition, a design of the box is convenient. In comparison with a design of an explosion-proof box structure in the related technology, a large amount of costs and time of proofing and testing can be saved according to the box provided in this embodiment of this application.

In a possible implementation, a side wall of the sleeve protrudes outward along a radial direction of the sleeve, and a protrusion degree of the side wall gradually decreases from a middle part of the sleeve to two ends of the sleeve along an axial direction of the sleeve.

In a possible implementation, a plurality of load reduction holes are provided on the side wall of the sleeve.

In a possible implementation, the load reduction holes are strip-shaped holes, length directions of the strip-shaped holes are the same as an axial direction of the sleeve, and the load reduction holes are evenly distributed along a circumferential direction of the sleeve.

In a possible implementation, at least some of the explosion venting assemblies further include a deformation limiting part, and the deformation limiting part includes a pad and a deformation limiting cylinder connected to the pad; and
in each explosion venting assembly including the deformation limiting part, the pad is sleeved on the fastener, the pad is attached to an end of the sleeve along an axial direction of the sleeve, the deformation limiting cylinder surrounds the sleeve, and an inner wall of the deformation limiting cylinder forms the blocking wall.

In a possible implementation, the cover or the box body is provided with n countersunk holes, and n is a positive integer less than or equal to a quantity of explosion venting assemblies;.

In a possible implementation, the critical buckling load of the sleeve is an axial pressing force applied to the sleeve plus <NUM> N to <NUM> N, and the axial pressing force applied to the sleeve is a pressing force applied to the sleeve when the fastener fits with the box body and the cover to press against the sleeve.

In a possible implementation, a flange is provided at the edge of the opening of the box body; and
the plurality of explosion venting assemblies are separately connected to the cover and the flange, and the plurality of explosion venting assemblies are disposed at spacings along a circumferential direction of the flange.

In a possible implementation, a plurality of connecting posts are provided on a surface of the cover that faces the flange, each connecting post is provided with a threaded hole along an axial direction of the connecting post, a quantity of connecting posts is the same as a quantity of explosion venting assemblies, and the connecting posts are in a one-to-one correspondence with the explosion venting assemblies;.

In a possible implementation, a spring washer is disposed between the press head and the sleeve.

An embodiment of this application further provides an electronic device in accordance with appended claim <NUM>.

Beneficial effects of the electronic device provided in this embodiment of this application are the same as those of the foregoing box.

The accompanying drawings herein are incorporated into the specification as a part of the specification. They show embodiments that conform to this application, and are used to explain principles of this application together with the specification.

The foregoing accompanying drawings show specific embodiments of this application, and more detailed descriptions are provided below. The accompanying drawings and text descriptions are intended to describe the concept of this application to a person skilled in the art with reference to specific embodiments.

In the related technology, a box structure is usually strengthened to prevent cracking of a box or cracking of a small opening when an explosion occurs inside the box, so as to prevent fragments of the box that are generated due to the explosion and components such as screws on the box from flying around. However, in the manner in which a box structure is strengthened, gas pressure inside a box cannot be released when an explosion occurs inside the box. This manner may be able to provide protection when a minor explosion occurs inside the box. However, when a severe explosion occurs inside the box, the box structure may be subject to irreparable large-area cracking, seriously affecting personal safety of a user.

In view of this, a linear buckling property of a sleeve is utilized in embodiments of this application. The sleeve covers a fastener configured to fasten a box body and a cover. In this way, when an explosion occurs inside a box, in an early stage of the explosion, the sleeve is compressed, and an opening is formed between the cover and the box body to release high-pressure gas inside the box body, so as to implement timely explosion venting for the box; and in a late stage of the explosion, the sleeve is restored, so that the cover can re-seal the box body under the action of the sleeve. Therefore, after the explosion occurs inside the box, deformation of the cover and the box body is small, and there is no opening or only a quite small opening between the cover and the box body after the cover re-seals the box body. This improves explosion-proof performance of the box.

The following clearly and completely describes technical solutions in embodiments of this application with reference to accompanying drawings in embodiments of this application. Clearly, the described embodiments are merely some but not all of embodiments of this application. All other embodiments obtained by a person of ordinary skill in the art based on embodiments of this application without creative efforts shall fall within the protection scope of this application.

As shown in <FIG>, a box provided in an embodiment of this application includes a box body <NUM>, a cover <NUM>, and a plurality of explosion venting assemblies <NUM>. The box body <NUM> has an opening. The cover <NUM> seals the opening of the box body <NUM>, so that enclosed space is formed inside the box body <NUM>.

As shown in <FIG>, the plurality of explosion venting assemblies <NUM> are disposed at spacings in a circumferential direction along an edge of the opening of the box body <NUM>. Each explosion venting assembly <NUM> includes a fastener <NUM> and a sleeve <NUM> covering the fastener <NUM>. The fastener <NUM> is configured to fasten the cover <NUM> and the box body <NUM>, and fit with the box body <NUM> and the cover <NUM> to press against the sleeve <NUM>. The sleeve <NUM> has a linear buckling property. <FIG> is a line graph of a buckling process of the sleeve <NUM>. Based on the linear buckling property of the sleeve <NUM>, the sleeve <NUM> has critical buckling load. An extreme point A in <FIG> is the critical buckling load of the sleeve <NUM>. When external load applied to the sleeve <NUM> is greater than the critical buckling load of the sleeve <NUM>, the sleeve <NUM> is subject to buckling, and a bearing capacity of the sleeve <NUM> decreases sharply. To be specific, rigidity of the sleeve <NUM> decreases sharply, and deformation of the sleeve <NUM> increases sharply. When the deformation of the sleeve <NUM> is still in an unstable region (that is, the deformation of the sleeve <NUM> is still in an elastic deformation stage), the sleeve <NUM> can be restored if the external load applied to the sleeve <NUM> is removed or the external load applied to the sleeve <NUM> is reduced to be less than the critical buckling load of the sleeve <NUM>. In this case, the rigidity of the sleeve <NUM> increases sharply.

Based on the linear buckling property of the sleeve <NUM>, the sleeve <NUM> is configured in a manner in which when the cover <NUM> is subject to an impact force from the inside of the box body <NUM>, the impact force is transferred to the sleeve <NUM>, and when a force applied to the sleeve <NUM> is greater than the critical buckling load of the sleeve <NUM>, the sleeve <NUM> is compressed and deformed, so that the cover <NUM> is separated from the box body <NUM> in a region corresponding to the sleeve <NUM>. When the sleeve <NUM> is in an elastic deformation stage, the impact force applied to the cover <NUM> decreases, and a force transferred to the sleeve <NUM> also decreases, and when a force applied to the sleeve <NUM> is less than the critical buckling load of the sleeve <NUM>, the sleeve <NUM> that is compressed and deformed due to the force is restored, so that the cover <NUM> re-seals the opening of the box body <NUM>. To be specific, the explosion venting assemblies <NUM> of the box provided in this embodiment of this application utilize the linear buckling property of the sleeves <NUM>, and the sleeves <NUM> cover the fasteners <NUM> configured to fasten the box body <NUM> and the cover <NUM>. When the cover <NUM> is subject to an impact force from the inside of the box body, the impact force is transferred to the sleeves <NUM>. When the impact force causes forces applied to some sleeves <NUM> to exceed critical buckling load of the sleeves <NUM>, the sleeves <NUM> subject to the forces greater than the critical buckling load are compressed and deformed. Therefore, the cover <NUM> in regions corresponding to the sleeves <NUM> is separated from the box body <NUM>. To be specific, an opening is formed between the box body <NUM> and the cover <NUM> in the regions corresponding to the sleeves <NUM>. When the impact force causes forces applied to all sleeves <NUM> to exceed critical buckling load of the sleeves <NUM>, all the sleeves <NUM> are compressed and deformed, so that the entire cover <NUM> is separated from the box body <NUM>. Because the entire cover <NUM> is separated from the box body <NUM>, relative deformation at all locations on the cover <NUM> is small, so that overall deformation of the cover <NUM> is small. Based on the linear buckling property of the sleeves <NUM>, when the sleeves <NUM> that are compressed and deformed due to the forces are still in an elastic deformation stage, the impact force applied to the cover <NUM> decreases, and forces transferred to the sleeves <NUM> also decrease, and when forces applied to the sleeves <NUM> are less than the critical buckling load of the sleeves <NUM>, the sleeves <NUM> that are compressed and deformed due to the forces are restored, so that the cover <NUM> separated from the box body <NUM> re-seals the box body <NUM>.

A case in which the cover <NUM> is subject to an impact force from the inside of the box body <NUM> is that an explosion occurs inside the box. When the explosion occurs at a location in an edge region inside the box body <NUM> and the explosion is minor, an impact force caused by the explosion to the cover <NUM> may cause only forces applied to some sleeves <NUM> to exceed critical buckling load of the sleeves <NUM>. In this case, the cover <NUM> in regions corresponding to the sleeves <NUM> is separated from the box body <NUM>, so that an opening is formed in a local region between the cover <NUM> and the box body <NUM> to release high-pressure gas inside the box body <NUM>. This implements timely explosion venting for the box, and reduces damage to the box when an explosion occurs inside the box. When the explosion is severe, the cover <NUM> is subject to a large impact force, and forces applied to all sleeves <NUM> are greater than critical buckling load of the sleeves <NUM>. In this case, the entire cover <NUM> is separated from the box body <NUM>, so that a large opening is formed between the cover <NUM> and the box body <NUM> to quickly release high-pressure gas inside the box body <NUM>. This implements timely explosion venting for the box, and reduces damage to the box when an explosion occurs inside the box. Due to the timely explosion venting for the box, the impact force caused by the explosion to the cover <NUM> sharply decreases, and therefore external load applied to a sleeve <NUM> when deformation of the sleeve <NUM> is still in an unstable region (that is, the deformation of the sleeve <NUM> is still in an elastic deformation stage) is reduced to be less than critical buckling load of the sleeve <NUM>, so that the sleeve <NUM> can be restored, the cover <NUM> can move in a direction toward the box body <NUM> under the action of the sleeve <NUM>, and the cover <NUM> re-seals the box body <NUM>. Therefore, after the explosion occurs inside the box, deformation of the cover <NUM> and the box body <NUM> is small, and there is no opening or only a quite small opening between the cover <NUM> and the box after the cover <NUM> re-seals the box body <NUM>. This improves explosion-proof performance of the box, reduces a probability of personal injury when the box experiences an explosion, and improves safety of using the box. In addition, when the box provided in this embodiment of this application experiences an explosion, after the cover <NUM> is separated from the box body <NUM> for explosion venting, the opening of the box body <NUM> can be re-sealed, so that there is no opening or only a quite small opening between the cover <NUM> and the box, and the box can still be used after experiencing the explosion. This reduces replacement costs of the box. In addition, a design of the box is convenient. In comparison with a design of an explosion-proof box structure in the related technology, a large amount of costs and time of proofing and testing can be saved according to the box provided in this embodiment of this application.

In this embodiment of this application, to ensure that the sleeve <NUM> is not subject to buckling (that is, not deformed) and ensure airtightness of the box when the box vibrates, the critical buckling load of the sleeve <NUM> should be greater than a pressing force applied to the sleeve <NUM> when the fastener <NUM>, the box body <NUM>, and the cover <NUM> fit with each other to press against the sleeve <NUM>, and a specific margin is reserved. The margin needs to be greater than a force applied to the sleeve <NUM> when the box is subject to vibration impact. Therefore, in this embodiment of this application, the critical buckling load of the sleeve <NUM> is designed based on the pressing force applied to the sleeve <NUM> when the fastener <NUM>, the box body <NUM>, and the cover <NUM> fit with each other to press against the sleeve <NUM>, and the force caused by the vibration impact to the sleeve <NUM> when the box is subject to the vibration impact.

Optionally, a designed critical buckling load of the sleeve <NUM> may be an axial pressing force applied to the sleeve <NUM> plus <NUM> N to <NUM> N, and the axial pressing force applied to the sleeve <NUM> is the pressing force applied to the sleeve <NUM> when the fastener <NUM>, the box body <NUM>, and the cover <NUM> fit with each other to press against the sleeve <NUM>. A small value may be used for a box with small mass, and a large value may be used for a box with large mass.

In this embodiment of this application, to make the critical buckling load of the sleeve <NUM> equal to the designed critical buckling load, the sleeve <NUM> needs to be designed based on the designed critical buckling load of the sleeve <NUM>. The sleeve <NUM> may be designed based on a formula for calculating critical buckling load for linear buckling. The formula for calculating critical buckling load for linear buckling is as follows: <MAT> where
Fcr is the critical buckling load (N) for linear buckling, E is an elastic modulus (MPa) of a material corresponding to a buckling structure, I is a cross-sectional inertia moment (mm<NUM>) of the buckling structure, µ is a length coefficient (a length coefficient in a typical constraint form), and l is a length or a height (mm) of the buckling structure, where the buckling structure is the sleeve <NUM> in this embodiment of this application, and the length coefficient in a typical constraint form is shown in Table <NUM>.

It can be learned from the foregoing formula that a cross-sectional shape and size, a length, an elastic modulus of a material, and a constraint form of the sleeve <NUM> all affect the critical buckling load for linear buckling of the sleeve <NUM>. Therefore, the cross-sectional shape, the cross-sectional size, the length, and the like of the sleeve <NUM> may be designed to make the sleeve <NUM> meet a requirement of the designed critical buckling load.

Optionally, to enable the critical buckling load of the sleeve <NUM> to meet the requirement, a plurality of load reduction holes <NUM> are provided on a side wall of the sleeve <NUM>. After the load reduction holes <NUM> are provided on the side wall of the sleeve <NUM>, the critical buckling load of the sleeve <NUM> can be reduced. During selection of the sleeve <NUM> for the box, a material of the sleeve <NUM> and a shape and a size of the sleeve <NUM> may be determined first, and then the load reduction holes <NUM> are provided on the side wall of the sleeve <NUM> based on a specified critical buckling load, so that the critical buckling load of the sleeve <NUM> is the same as the specified critical buckling load, and the sleeve <NUM> meets the requirement of the designed critical buckling load. In this arrangement manner, sleeves <NUM> can be quickly determined for different boxes. This manner is simple and convenient.

Optionally, the load reduction holes <NUM> are strip-shaped holes, length directions of the strip-shaped holes are the same as an axial direction of the sleeve <NUM>, and the load reduction holes <NUM> are evenly distributed along a circumferential direction of the sleeve <NUM>. In this arrangement, two end faces along the axial direction of the sleeve <NUM> can remain basically parallel without deflection when the sleeve <NUM> is compressed and deformed, so that deformation of the cover <NUM> is reduced.

According to the box provided in this embodiment of this application, in an early stage of an explosion, an opening is formed between the cover <NUM> and the box body <NUM> for timely explosion venting, and in a late stage of the explosion, an impact force applied to the cover <NUM> decreases sharply, a sleeve <NUM> that is compressed and deformed due to a force is restored, and the cover <NUM> re-seals the box body <NUM> under the action of the sleeve <NUM>. Therefore, after an explosion occurs inside the box, deformation of the cover and the box body is small, and there is no opening or only a quite small opening between the cover and the box body after the cover re-seals the box body. This improves explosion-proof performance of the box, reduces a probability of personal injury when the box experiences an explosion, and improves safety of using the box. In addition, the sleeve <NUM> of the box is pre-designed based on the pressing force applied to the sleeve <NUM> when the fastener <NUM>, the box body <NUM>, and the cover <NUM> fit with each other to press against the sleeve <NUM>, and the force caused by the vibration impact to the sleeve <NUM> when the box is subject to the vibration impact. Therefore, the box provided in this embodiment of this application usually needs to undergo only one explosion-proof test. However, in the related technology, a box usually needs to undergo three or four rounds or even five or six rounds of design iterations. Therefore, according to the box provided in this embodiment of this application, costs and time of at least <NUM> times of proofing and testing can be saved. In addition, in the related technology, a box structure is strengthened to achieve explosion resistance, and therefore a design of the box structure is redundant. According to the box provided in this embodiment of this application, when an explosion occurs inside the box, timely explosion venting can be implemented, so that a risk of cracking of the box is low, and deformation of the cover <NUM> is small. Therefore, according to the box provided in this embodiment of this application, a structure of the cover <NUM> or even the box body <NUM> can be weakened. This reduces material costs.

In some embodiments of this application, as shown in <FIG>, to guide a compression and deformation direction of the sleeve <NUM>, the side wall of the sleeve <NUM> protrudes outward along a radial direction of the sleeve <NUM>, and a protrusion degree of the side wall gradually decreases from a middle part of the sleeve <NUM> to two ends of the sleeve <NUM> along an axial direction of the sleeve <NUM>.

In some embodiments of this application, to avoid irreversible deformation of the sleeve <NUM> caused when a deformation amount of the sleeve <NUM> exceeds a preset deformation amount, the box further includes a plurality of blocking walls. The plurality of blocking walls are in a one-to-one correspondence with a plurality of sleeves <NUM>. For the blocking wall and the sleeve <NUM> that correspond to each other, the blocking wall surrounds the sleeve <NUM>, there is a spacing between the blocking wall and an outer wall of the sleeve <NUM>, and the blocking wall is configured to prevent the deformation amount of the sleeve <NUM> from exceeding the preset deformation amount. The preset deformation amount is a deformation amount of the sleeve <NUM> when the sleeve <NUM> reaches irreversible deformation. This arrangement can ensure that the sleeve <NUM> can be restored after deformation, and ensure that the cover <NUM> can re-seal the box body <NUM> after explosion venting is implemented for the box.

In this embodiment of this application, the blocking wall may be arranged in a plurality of manners. For example, the blocking wall may be arranged in the following two manners.

In a first arrangement manner for the blocking wall, refer to both <FIG> and <FIG>. At least some of the explosion venting assemblies <NUM> further include a deformation limiting part <NUM>. The deformation limiting part <NUM> includes a pad and a deformation limiting cylinder connected to the pad. In each explosion venting assembly including the deformation limiting part <NUM>, the pad is sleeved on the fastener <NUM>, the pad is attached to an end of the sleeve <NUM> along an axial direction of the sleeve <NUM>, the deformation limiting cylinder surrounds the sleeve <NUM>, and an inner wall of the deformation limiting cylinder forms the blocking wall. To be specific, the pad is located at an end of the sleeve <NUM> along the axial direction of the sleeve <NUM>; the fastener <NUM> fits with the box body <NUM> and the cover <NUM> to press against the sleeve <NUM> and also press against the pad, so that a location of the deformation limiting cylinder is fixed; the deformation limiting cylinder surrounds the sleeve <NUM>; and the deformation limiting cylinder is configured to prevent the deformation amount of the sleeve <NUM> from exceeding the preset deformation amount, that is, the inner wall of the deformation limiting cylinder forms the blocking wall.

The deformation limiting part is a structure for preventing the deformation amount of the sleeve <NUM> from exceeding the preset deformation amount. That at least some of the explosion venting assemblies <NUM> further include a deformation limiting part <NUM> may mean that some of the explosion venting assemblies <NUM> include the deformation limiting part <NUM> and some of the explosion venting assemblies <NUM> do not include the deformation limiting part <NUM>, or may mean that all of the explosion venting assemblies include the deformation limiting part <NUM>. To be specific, all structures for preventing the deformation amount of the sleeve <NUM> from exceeding the preset deformation amount may be the deformation limiting part <NUM>, or some of the structures may be the deformation limiting part <NUM>, and others may be another structure, for example, a countersunk hole structure in the following descriptions. Certainly, a structure for preventing the deformation amount of the sleeve <NUM> from exceeding the preset deformation amount may alternatively be another structure arranged around the sleeve <NUM>. This is not specifically limited herein.

Optionally, the pad may be a gasket disposed at an end of the sleeve <NUM>. Optionally, a second gasket <NUM> is disposed at an end of the sleeve <NUM> that is away from the pad.

In a second arrangement manner for the blocking wall, the cover <NUM> or the box body <NUM> is provided with n countersunk holes, and n is a positive integer less than or equal to a quantity of explosion venting assemblies. Each countersunk hole includes a first hole and a second hole that are coaxial and connected. A hole diameter of the first hole is greater than a hole diameter of the second hole. A hole-wall end face of the second hole that is close to the first hole forms a stepped surface. n explosion venting assemblies of the plurality of explosion venting assemblies are in a one-to-one correspondence with the n countersunk holes, and for the explosion venting assembly and the countersunk hole that correspond to each other, the sleeve of the explosion venting assembly is placed in the first hole, an inner wall of the first hole forms the blocking wall, an end of the fastener of the explosion venting assembly has a press head, and the fastener presses against the sleeve between the press head and the stepped surface.

The countersunk hole is another structure for preventing the deformation amount of the sleeve <NUM> from exceeding the preset deformation amount. The cover <NUM> or the box body <NUM> is provided with n countersunk holes. n explosion venting assemblies of the plurality of explosion venting assemblies are in a one-to-one correspondence with the n countersunk holes. To be specific, all structures for preventing the deformation amount of the sleeve <NUM> from exceeding the preset deformation amount may be the countersunk hole structure, or some of the structures may be the countersunk hole structure, and others may be another structure, for example, the structure with the deformation limiting part <NUM> in the foregoing descriptions. Certainly, a structure for preventing the deformation amount of the sleeve <NUM> from exceeding the preset deformation amount may alternatively be another structure arranged around the sleeve <NUM>. This is not specifically limited herein.

Optionally, in the second arrangement manner for the blocking wall, gaskets are respectively disposed at two ends of the sleeve <NUM> along the axial direction of the sleeve <NUM>.

In some embodiments of this application, refer to both <FIG>. A flange <NUM> is provided at the edge of the opening of the box body <NUM>, the plurality of explosion venting assemblies <NUM> are separately connected to the cover <NUM> and the flange <NUM>, and the plurality of explosion venting assemblies <NUM> are disposed at spacings along a circumferential direction of the flange <NUM>. In this arrangement, the cover <NUM> can be more securely fastened to the box body <NUM>, and airtightness in the box body <NUM> is improved. In addition, the plurality of explosion venting assemblies <NUM> are disposed at spacings along the circumferential direction of the flange <NUM>. In this way, when a severe explosion occurs inside the box, sleeves <NUM> of the explosion venting assemblies <NUM> disposed at spacings along the circumferential direction of the flange <NUM> are all compressed and deformed, so that the entire cover <NUM> moves in a direction away from the box body <NUM>, and a sufficiently large opening is formed between the cover <NUM> and the box body <NUM> to fully release gas pressure inside the box body <NUM>. Because the cover <NUM> moves as a whole, relative deformation at all locations on the cover <NUM> is small, so that overall deformation of the cover <NUM> is quite small.

When the plurality of explosion venting assemblies <NUM> are disposed at spacings along the circumferential direction of the flange <NUM>, an example manner of fastening the cover <NUM> to the box body <NUM> is as follows: Still refer to <FIG>. A plurality of connecting posts <NUM> are provided on a surface of the cover <NUM> that faces the flange <NUM>. Each connecting post <NUM> is provided with a threaded hole along an axial direction of the connecting post <NUM>. A quantity of connecting posts <NUM> is the same as a quantity of explosion venting assemblies <NUM>, and the connecting posts <NUM> are in a one-to-one correspondence with the explosion venting assemblies <NUM>. One end of the fastener <NUM> has a press head, and the other end of the fastener <NUM> has external threads. The end of the fastener <NUM> that has the external threads extends into the threaded hole through the flange <NUM>. The sleeve <NUM> is pressed against between the press head and the flange <NUM>.

Optionally, the fastener <NUM> is a bolt or a screw.

In an example manner of a fastening the cover <NUM> to the box body <NUM>, a spring washer <NUM> is disposed between the press head and the sleeve <NUM>, and the spring washer <NUM> is configured to prevent the fastener <NUM> from loosening, so as to improve stability of explosion venting for the box.

In an example manner of fastening the cover <NUM> to the box body <NUM>, in the first arrangement manner for the blocking wall, the pad is pressed against between the sleeve <NUM> and the flange <NUM>, and the second gasket <NUM> is disposed between the sleeve <NUM> and the spring washer <NUM>, that is, the spring washer <NUM> is disposed between the second gasket <NUM> and the press head of the fastener <NUM>.

Claim 1:
An inverter, comprising:
a box and an electronic component disposed in the box, wherein the box comprises:
a box body (<NUM>), having an opening;
a cover (<NUM>), sealing the opening of the box body (<NUM>), so that enclosed space is formed inside the box body (<NUM>) ; and
a plurality of explosion venting assemblies (<NUM>), disposed at spacings in a circumferential direction along an edge of the opening of the box body (<NUM>),
wherein each explosion venting assembly (<NUM>) comprises a fastener (<NUM>) and a sleeve (<NUM>) covering the fastener (<NUM>),
the fastener (<NUM>) is configured to fasten the cover (<NUM>) to the box body (<NUM>), and fit with the box body (<NUM>) and the cover (<NUM>) to press against the sleeve (<NUM>),
the sleeve (<NUM>) has critical buckling load, the sleeve (<NUM>) is configured in a manner in which when the cover (<NUM>) is subject to an impact force from the inside of the box body (<NUM>), the impact force is transferred to the sleeve (<NUM>), and when a force applied to the sleeve (<NUM>) is greater than the critical buckling load of the sleeve (<NUM>),
the sleeve (<NUM>) is compressed and deformed, so that the cover (<NUM>) in a region corresponding to the sleeve (<NUM>) is separated from the box body (<NUM>), characterised in that:
the box further comprises a plurality of blocking walls, the plurality of blocking walls are in a one-to-one correspondence with a plurality of sleeves (<NUM>), and for the blocking wall and the sleeve (<NUM>) that correspond to each other, the blocking wall surrounds the sleeve (<NUM>), there is a spacing between the blocking wall and an outer wall of the sleeve (<NUM>), and the blocking wall is configured to prevent a deformation amount of the sleeve (<NUM>) from exceeding a preset deformation amount.