Battery pack and electric equipment

Abstract

The battery pack comprises single batteries, a lower box body, an upper cover and an anti-explosion valve core, the lower box body and the upper cover are connected to form a mounting cavity, the single batteries are arranged in the mounting cavity, the lower box body or the upper cover is provided with a mounting hole, the mounting hole is communicated with the mounting cavity, the anti-explosion valve core is arranged in the mounting hole, and the anti-explosion valve core is arranged in the mounting hole. The anti-explosion valve element can move in the axis direction of the mounting hole so that the anti-explosion valve element can seal the mounting hole or conduct the mounting hole. The explosion-proof valve element comprises a cover body and a piston rod, the cover body and the piston rod are distributed in the mounting hole in the direction from the exterior of the mounting cavity to the interior of the mounting cavity, the piston rod is provided with a first end and a second end which are opposite in the axial direction of the mounting hole, the first end of the piston rod is connected with the cover body, and the second end of the piston rod faces the interior of the mounting cavity. The piston rod can move in the axis direction of the mounting hole so that the cover body can seal the mounting hole or conduct the mounting hole.

Description

Technical Field

[0001] The present application belongs to the field of battery manufacturing technology, and specifically relates to a battery pack and electrical equipment. Background Art

[0002] With the development and popularization of new energy vehicles, the energy density requirements of vehicle power battery systems are getting higher and higher, and the energy of single batteries is getting higher and higher. This leads to a large amount of gas and instantaneous pressure generated when the battery pack is thermally runaway. If it cannot be discharged in time, it will cause the entire battery pack box or cover to explode. Therefore, the explosion-proof function is a function that cannot be ignored in the battery pack. The current common practice in the market is to install an independent explosion-proof valve on the battery pack box. When the pressure in the box rises to the calibrated value, the explosion-proof valve opens to release the pressure. However, in this way of setting the explosion-proof valve on the battery pack box, the integration of the battery pack is reduced, and it is easy to cause problems with poor installation. Utility Model Content

[0003] The embodiments of the utility model provide a battery pack and an electrical device to solve the problem in the related art that the setting of the explosion-proof valve reduces the integration of the battery pack and is prone to poor installation.

[0004] In order to solve the above technical problems, the utility model is achieved as follows:

[0005] In a first aspect, an embodiment of the utility model provides a battery pack, the battery pack comprising a single battery, a lower box, an upper cover and an explosion-proof valve core, the lower box and the upper cover are connected to form a mounting cavity, the single battery is arranged in the mounting cavity, the lower box or the upper cover is provided with a mounting hole, the mounting hole is connected to the mounting cavity, the explosion-proof valve core is arranged in the mounting hole, and the explosion-proof valve core can move along the axial direction of the mounting hole, so that the explosion-proof valve core closes the mounting hole or conducts the mounting hole;

[0006] The explosion-proof valve core includes a cover body and a piston rod, and the cover body and the piston rod are distributed in the mounting hole along the direction from the outside of the mounting cavity to the inside of the mounting cavity. In the axial direction of the mounting hole, the piston rod has a first end and a second end relative to each other, the first end of the piston rod is connected to the cover body, and the second end of the piston rod faces the inside of the mounting cavity. The piston rod can move along the axial direction of the mounting hole so that the cover body closes the mounting hole or conducts the mounting hole.

[0007] Optionally, the explosion-proof valve core also includes a driving member, which is arranged in the mounting hole and connected to the piston rod and the hole wall of the mounting hole. The driving member is used to drive the piston rod to move so that the cover body closes the mounting hole or connects the mounting hole.

[0008] Optionally, the driving member is an elastic member, a blocking member is provided on the hole wall of the mounting hole, a fixing member is provided on the second end of the piston rod, the driving member is sleeved on the piston rod, the driving member is located between the fixing member and the blocking member, the driving member abuts against the fixing member and the blocking member, the fixing member is close to the mounting cavity, and the blocking member is far away from the mounting cavity;

[0009] When the elastic member is extended or retracted, the driving member moves to drive the piston rod to move, so that the cover body closes the mounting hole or opens the mounting hole.

[0010] Optionally, in the axial direction of the mounting hole, the cover body has a first end facing the piston rod, a connecting hole is provided on the first end of the cover body, the first end of the piston rod is located in the connecting hole and connected to the hole wall of the connecting hole.

[0011] Optionally, a vent hole is provided on the cover body, a first through hole is provided on the piston rod, the first through hole penetrates the piston rod along the axial direction of the piston rod, the vent hole is connected to the first through hole, and a waterproof breathable membrane is also provided on the cover body, and the waterproof breathable membrane covers the vent hole.

[0012] Optionally, a mounting groove is further provided on the cover body, the vent hole passes through the bottom of the mounting groove, the waterproof breathable membrane is provided in the mounting groove, and the waterproof breathable membrane covers the vent hole.

[0013] Optionally, the explosion-proof valve core also includes a pressure plate and a pressure ring, wherein the pressure ring is connected to the cover body and protrudes from the cover body, the surface of the pressure ring facing away from the cover body is connected to the pressure plate, and a preset space is provided between the pressure plate and the cover body, and the part of the pressure ring protruding from the cover body is provided with an exhaust hole, the exhaust hole penetrates the pressure ring along the radial direction of the pressure ring, and the preset space is connected to the exhaust hole.

[0014] Optionally, the blocking member is a block connected to the hole wall of the mounting hole, and in the axial direction of the mounting hole, a projection of the block on the surface of the cover body facing the piston rod and a projection of the elastic member on the surface of the cover body facing the piston rod at least partially overlap, and a projection of the block on the surface of the cover body facing the piston rod and a projection of the piston rod on the surface of the cover body facing the piston rod do not overlap;

[0015] Alternatively, the blocking member is a retaining ring, a avoidance hole is arranged inside the retaining ring, the retaining ring is connected to the hole wall of the mounting hole, the piston rod is passed through the avoidance hole, and in the axial direction of the mounting hole, the projection of the retaining ring on the surface of the cover body facing the piston rod and the projection of the elastic member on the surface of the cover body facing the piston rod at least partially overlap, and the projection of the retaining ring on the surface of the cover body facing the piston rod and the projection of the piston rod on the surface of the cover body facing the piston rod do not overlap.

[0016] Optionally, a countersunk hole is provided on the surface of the upper cover or the lower box body facing away from the mounting cavity, a second through hole is provided at the bottom of the countersunk hole, the countersunk hole and the second through hole form the mounting hole, the cover body is provided in the countersunk hole, and the surface of the cover body facing the piston rod abuts against the bottom of the countersunk hole, and the blocking member is provided in the second through hole and connected to the hole wall of the second through hole.

[0017] Optionally, a groove is provided at the bottom of the counterbore, a sealing member is provided in the groove, and the sealing member abuts against a surface of the cover body facing the piston rod.

[0018] In a second aspect, an embodiment of the utility model further proposes an electrical device, wherein the electrical device comprises a battery pack as described in any one of the first aspects above.

[0019] The battery pack includes a single cell, a lower box, an upper cover and an explosion-proof valve core, wherein the lower box can be connected to the upper cover to form an installation cavity, and the installation cavity can provide an installation space for the single cell. A mounting hole is provided on the lower box or the upper cover, and the mounting hole is connected to the mounting cavity, so that the gas in the mounting cavity can exchange gas with the outside through the mounting hole. The explosion-proof valve core is arranged in the mounting hole, and the explosion-proof valve core can move along the axial direction of the mounting hole, so that the explosion-proof valve core can close the mounting hole or conduct the mounting hole. When the battery pack is working normally, the explosion-proof valve core can close the mounting hole, and the mounting cavity can exchange gas with the outside through the explosion-proof valve core, and the explosion-proof valve core plays a breathing role at this time; in the case of thermal runaway of the battery pack, the explosion-proof valve core can move to make the mounting hole in a conducting state, at this time, the mounting cavity can be directly connected to the outside through the mounting hole, and the gas in the mounting cavity can flow out through the mounting hole, so that the pressure in the mounting cavity can be quickly reduced to prevent the mounting cavity from exploding, and the explosion-proof valve core plays an explosion-proof role at this time. Specifically, the explosion-proof valve core in the installation cavity includes a cover body and a piston rod, and the cover body and the piston rod are distributed in the installation hole along the direction from the outside of the installation cavity to the inside of the installation cavity, that is, the piston rod is located on a side close to the installation cavity, and the cover body is located on a side away from the installation cavity. The first end of the piston rod can be connected to the cover body, that is, the piston rod and the cover body are connected to each other and can move synchronously in the installation hole, so that the cover body can close the installation hole to realize the breathing effect of the explosion-proof valve core, or conduct the installation hole to realize the explosion-proof effect of the explosion-proof valve core.

[0020] In an embodiment of the utility model, a mounting hole is provided on the lower box body or the upper cover, and the explosion-proof valve core is directly arranged in the mounting hole. The mounting hole can provide an installation position for the explosion-proof valve core. The lower box body or the upper cover can serve as a shell of the explosion-proof valve core. The explosion-proof valve core is integrated into the lower box body or the upper cover to realize the integration of the box body and the explosion-proof valve system, which can improve the battery pack molding efficiency, reduce assembly defects, and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0022] Figure 2 is a cross-sectional view of a battery pack provided in an embodiment of the present application;

[0023] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0024] Figure 4 It is a schematic diagram of the installation of the explosion-proof valve core provided by the embodiment of the utility model;

[0025] Figure 5 This is one of the cross-sectional views of the explosion-proof valve core provided by the embodiment of the utility model;

[0026] Figure 6 This is the second cross-sectional view of the explosion-proof valve core provided by the embodiment of the utility model;

[0027] Figure 7 It is a schematic diagram of a cover body provided by an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 100: battery pack; 10: lower box body; 20: upper cover; 30: explosion-proof valve core; 40: installation cavity; 101: installation hole; 102: blocking member; 311: cover body; 312: piston rod; 313: driving member; 3121: fixing member; 3111: connecting hole; 3112: vent hole; 3122: first through hole; 3113: installation groove; 314: waterproof breathable membrane; 315: pressure ring; 316: pressure plate; 3151: exhaust hole; 1021: stopper; 1022: retaining ring; 1023: avoidance hole; 1011: countersunk hole; 1012: second through hole; 1013: slot; 1014: sealing member; 50: preset space. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0032] like Figures 1 to 7As shown, the battery pack 100 includes a single battery, a lower box body 10, an upper cover 20 and an explosion-proof valve core 30. The lower box body 10 is connected to the upper cover 20 to form a mounting cavity 40. The single battery is arranged in the mounting cavity 40. The lower box body 10 or the upper cover 20 is provided with a mounting hole 101, and the mounting hole 101 is connected to the mounting cavity 40. The explosion-proof valve core 30 is arranged in the mounting hole 101, and the explosion-proof valve core 30 can move along the axial direction of the mounting hole 101, so that the explosion-proof valve core 30 closes the mounting hole 101 or conducts the mounting hole 101; the explosion-proof valve core 30 includes a cover The body 311 and the piston rod 312, the cover body 311 and the piston rod 312 are distributed in the mounting hole 101 along the direction from the outside of the mounting cavity 40 to the inside of the mounting cavity 40. In the axial direction of the mounting hole 101, the piston rod 312 has a first end and a second end relative to each other. The first end of the piston rod 312 is connected to the cover body 311, and the second end of the piston rod 312 faces the inside of the mounting cavity 40. The piston rod 312 and the cover body 311 can both move along the axial direction of the mounting hole 101, and the cover body 311 can close the mounting hole 101 or connect the mounting hole 101.

[0033] The battery pack 100 includes a single battery, a lower box 10, an upper cover 20, and an explosion-proof valve core 30, wherein the lower box 10 can be connected to the upper cover 20 to form a mounting cavity 40, and the mounting cavity 40 can provide a mounting space for the single battery. A mounting hole 101 is provided on the lower box 10 or the upper cover 20, and the mounting hole 101 is connected to the mounting cavity 40, so that the gas in the mounting cavity 40 can exchange gas with the outside through the mounting hole 101. The explosion-proof valve core 30 is arranged in the mounting hole 101, and the explosion-proof valve core 30 can move along the axial direction of the mounting hole 101, so that the explosion-proof valve core 30 can close the mounting hole 101 or connect the mounting hole 101. When the battery pack 100 is working normally, the explosion-proof valve core 30 can close the mounting hole 101, and the mounting cavity 40 can exchange gas with the outside through the explosion-proof valve core 30. At this time, the explosion-proof valve core 30 plays a breathing role; in the case of thermal runaway of the battery pack 100, the explosion-proof valve core 30 can move to make the mounting hole 101 in a conducting state. At this time, the mounting cavity 40 can be directly connected to the outside through the mounting hole 101, and the gas in the mounting cavity 40 can flow out through the mounting hole 101, thereby quickly reducing the pressure in the mounting cavity 40 to prevent the mounting cavity 40 from exploding. At this time, the explosion-proof valve core 30 plays an explosion-proof role. Specifically, the explosion-proof valve core 30 in the installation cavity 40 includes a cover body 311 and a piston rod 312, and the cover body 311 and the piston rod 312 are distributed in the installation hole 101 along the direction from the outside of the installation cavity 40 to the inside of the installation cavity 40, that is, the piston rod 312 is located on a side close to the installation cavity 40, and the cover body 311 is located on a side away from the installation cavity 40. The first end of the piston rod 312 can be connected to the cover body 311, that is, the piston rod 312 and the cover body 311 are connected to each other and can move synchronously in the installation hole 101, so that the cover body 311 can close the installation hole 101 to realize the breathing effect of the explosion-proof valve core 30, or conduct the installation hole 101 to realize the explosion-proof effect of the explosion-proof valve core 30.

[0034] In the embodiment of the utility model, a mounting hole 101 is provided on the lower box body 10 or the upper cover 20, and the explosion-proof valve core 30 is directly arranged in the mounting hole 101. The mounting hole 101 can provide a mounting position for the explosion-proof valve core 30. The lower box body 10 or the upper cover 20 can serve as a shell of the explosion-proof valve core 30. The explosion-proof valve core 30 is integrated into the lower box body 10 or the upper cover 20 to realize the integration of the box body and the explosion-proof valve system, which can improve the molding efficiency of the battery pack 100, reduce assembly defects, and reduce costs.

[0035] In addition, in some embodiments, a connecting hole 3111 may be provided at one end of the cover body 311 facing the piston rod 312 , and the end of the piston rod 312 facing the cover body 311 is located in the connecting hole 3111 and connected to the hole wall of the connecting hole 3111 .

[0036] The cover body 311 is provided with a connection hole 3111 at one end facing the piston rod 312, and the piston rod 312 can be connected to the cover body 311 through the connection hole 3111, so that the cover body 311 and the piston rod 312 can move in the mounting hole 101 to achieve a breathing effect or an explosion-proof effect. Specifically, the end of the piston rod 312 facing the cover body 311 can extend into the connection hole 3111 and be connected to the hole wall of the connection hole 3111.

[0037] In addition, in some embodiments, the explosion-proof valve core 30 may further include a driving member 313, which is disposed in the mounting hole 101 and is connected to the piston rod 312 and the hole wall of the mounting hole 101. The driving member 313 is used to drive the piston rod 312 to move so that the cover body 311 closes the mounting hole 101 or connects the mounting hole 101.

[0038] The explosion-proof valve core 30 also includes a driving member 313, which is arranged in the mounting hole 101 and is connected to the piston rod 312 and the hole wall of the mounting hole 101. The driving member 313 can drive the piston rod 312 to move, and the piston rod 312 is connected to the cover body 311. Therefore, when the driving member 313 works to move the piston rod 312, the piston rod 312 can drive the cover body 311 to move, so that the cover body 311 closes the mounting hole 101 or connects the mounting hole 101, so that the battery pack 100 can breathe or relieve pressure through the explosion-proof valve core 30.

[0039] In addition, in some embodiments, the driving member 313 is an elastic member, a blocking member 102 may be provided on the hole wall of the mounting hole 101, a fixing member 3121 is provided on the second end of the piston rod 312, the driving member 313 is sleeved on the piston rod 312, the driving member 313 is located between the fixing member 3121 and the blocking member 102, the driving member 313 is in contact with the fixing member 3121 and the blocking member 102, the fixing member 3121 is close to the mounting cavity 40, and the blocking member 102 is away from the mounting cavity 40; when the elastic member is extended or retracted, the driving member 313 moves to drive the piston rod 312 to move, so that the cover body 311 closes the mounting hole 101 or connects the mounting hole 101.

[0040] The second end of the piston rod 312 is provided with a fixing member 3121. Therefore, when the explosion-proof valve core 30 moves in the mounting hole 101, the fixing member 3121 at the second end of the piston rod 312 also moves in the mounting hole 101. A blocking member 102 is provided on the hole wall of the mounting hole 101. The blocking member 102 is farther away from the mounting cavity 40 than the fixing member 3121. An elastic member is sleeved on the piston rod 312. Since the driving member 313 is located between the fixing member 3121 and the blocking member 102, and the driving member 313 abuts against the fixing member 3121 and the blocking member 102, when the fixing member 3121 moves, the fixing member 3121 can apply force to the driving member 313, so that the state of the driving member 313 changes. Specifically, when the battery pack 100 experiences thermal runaway and the pressure in the mounting cavity 40 is relatively high, the gas in the mounting cavity 40 can work on the piston rod 312 and / or the cover body 311, so that the piston rod 312 and the cover body 311 can move away from the mounting cavity 40. At this time, the fixing member 3121 is close to the blocking member 102, so that the elastic member can be compressed. At the same time, the movement of the cover body 311 can make the mounting hole 101 conductive, and the gas in the mounting cavity 40 can flow out through the explosion-proof valve core 30 and the mounting hole 101, thereby achieving rapid pressure relief. When the pressure in the installation cavity 40 reaches a normal state after the pressure relief is completed, the gas in the installation cavity 40 has no thrust on the piston rod 312 and the cover body 311. At this time, the elastic member can restore at least part of its deformation, work on the fixing member 3121, and push the fixing member 3121 toward the installation cavity 40, so that the piston rod 312 and the cover body 311 can move toward the installation cavity 40 and block the installation hole 101. At this time, the installation cavity 40 can exchange gas with the outside through the explosion-proof valve core 30, so that the air pressure inside and outside the battery pack 100 is balanced and normal breathing is performed.

[0041] It should be noted that the elastic member may be a spring, or may be a hollow structure made of an elastic material, or of course, may be a spring sheet, etc. The present invention does not specifically limit the specific type of the elastic member.

[0042] In addition, in addition to the elastic member, the driving member 313 can also be other components, such as linear motors and other components that can perform linear motion, as long as they can drive the piston rod 312 to move in the mounting hole 101. In the case where the driving member 313 is a linear motor, a controller can also be provided in the battery pack 100, and the controller can be connected to the linear motor. The controller is integrated with a pressure detection device, and the pressure detection device can detect the pressure in the mounting cavity 40. For example, in the case of thermal runaway of the battery pack 100, the pressure detection device detects that the pressure is too high. At this time, the controller can control the linear motor to work to drive the piston rod 312 to move.

[0043] In addition, in some embodiments, a vent hole 3112 may be provided on the cover body 311, and a first through hole 3122 may be provided on the piston rod 312. The first through hole 3122 penetrates the piston rod 312 along the axial direction of the piston rod 312. The first through hole 3122 is connected to the vent hole 3112 and the installation cavity 40. A waterproof and breathable membrane 314 is also provided on the cover body 311, and the waterproof and breathable membrane 314 covers the vent hole 3112.

[0044] The piston rod 312 is provided with a first through hole 3122, which penetrates the piston rod 312 along the axial direction of the piston rod 312, and the cover body 311 is provided with a vent hole 3112. Since the first through hole 3122 is connected to the vent hole 3112 and the mounting cavity 40, when the pressure in the mounting cavity 40 is normal, the gas in the mounting cavity 40 can flow to the vent hole 3112 through the first through hole 3122 in the piston rod 312, and then flow outward, so as to achieve a normal breathing process. Of course, when the battery pack 100 has thermal runaway and the pressure in the mounting cavity 40 is abnormal, in addition to flowing outward through the mounting hole 101, part of the gas can also flow outward through the first through hole 3122 and the vent hole 3112. Since the piston rod 312 and the cover body 311 are installed in the mounting hole 101, even after the explosion-proof valve core 30 moves to the position connecting to the mounting hole 101, part of the piston rod 312 or the cover body 311 may still be inside the mounting hole 101, affecting the space available for gas flow in the mounting hole 101. Therefore, the gas flows outward through the first through hole 3122 and the vent hole 3112, which can make the pressure release speed faster and improve the safety of the battery pack 100.

[0045] In the embodiment of the utility model, a waterproof breathable membrane 314 may also be provided on the cover body 311. Since the waterproof breathable membrane 314 covers the vent hole 3112, gas can flow normally through the waterproof breathable membrane 314, thereby maintaining the consistency of the internal and external pressures of the battery pack 100, and preventing external water and other liquids from entering the installation cavity 40 through the vent hole 3112 and the first through hole 3122, thereby preventing the occurrence of damage to the single battery and other parts in the installation cavity 40.

[0046] In addition, in some embodiments, a mounting groove 3113 may be further provided on the cover body 311 , the vent hole 3112 passes through the bottom of the mounting groove 3113 , the waterproof breathable membrane 314 is provided in the mounting groove 3113 , and the waterproof breathable membrane 314 covers the vent hole 3112 .

[0047] The cover body 311 is also provided with a mounting groove 3113, and the vent hole 3112 runs through the bottom of the mounting groove 3113, so that the mounting groove 3113 can be connected with the first through hole 3122, so that the gas can reach the mounting groove 3113 through the first through hole 3122 and the vent hole 3112 and be discharged outward. In addition, the setting of the mounting groove 3113 can also provide an installation space for the waterproof breathable membrane 314, and the waterproof breathable membrane 314 can be set in the mounting groove 3113 to facilitate the installation of the waterproof breathable membrane 314. Since the waterproof breathable membrane 314 covers the vent hole 3112, the gas entering the vent hole 3112 can first pass through the waterproof breathable membrane 314, thereby preventing liquid from entering the vent hole 3112, and further preventing the problem of liquid entering the installation cavity 40 and damaging the components in the installation cavity 40.

[0048] Specifically, the connecting hole 3111 can be located at one end of the cover body 311 close to the installation cavity 40, the installation groove 3113 can be located at one end of the cover body 311 away from the installation cavity 40, and the vent hole 3112 can be set at the bottom of the installation groove 3113, and the installation groove 3113 is connected with the connecting hole 3111, so that the gas in the installation cavity 40 can pass through the first through hole 3122, the connecting hole 3111, and the vent hole 3112 in sequence to reach the installation groove 3113, and be discharged outward through the installation groove 3113 to perform gas exchange.

[0049] When installing the waterproof breathable membrane 314 , the waterproof breathable membrane 314 may be connected to the groove wall of the installation groove 3113 , and / or the waterproof breathable membrane 314 may be connected to the groove bottom of the installation groove 3113 .

[0050] In addition, in some embodiments, the explosion-proof valve core 30 may further include a pressure plate 316 and a pressure ring 315, the pressure ring 315 is connected to the cover body 311, and the pressure ring 315 protrudes from the cover body 311, the surface of the pressure ring 315 facing away from the cover body 311 is connected to the pressure plate 316, and a preset space 50 is provided between the pressure plate 316 and the cover body 311, and the part of the pressure ring 315 protruding from the cover body 311 is provided with an exhaust hole 3151, the exhaust hole 3151 penetrates the pressure ring 315 along the radial direction of the pressure ring 315, and the preset space 50 is connected to the exhaust hole 3151.

[0051] The explosion-proof valve core 30 further includes a pressing plate 316 and a pressing ring 315, wherein the pressing ring 315 is connected to the cover body 311, and the surface of the pressing ring 315 facing away from the cover body 311 is connected to the pressing plate 316. Since the pressing ring 315 protrudes from the cover body 311, there is a distance between the surface of the pressing ring 315 facing away from the cover body 311 and the pressing plate 316, and the pressing ring 315 will extend outward from the cover body 311, and there may be a preset space 50 between the pressing plate 316 and the cover body 311. An exhaust hole 3151 is provided on the portion of the pressing ring 315 protruding from the cover body 311. Since the exhaust hole 3151 penetrates the pressing ring 315 in the radial direction of the pressing ring 315, the exhaust hole 3151 can connect the space inside the pressing ring 315 with the preset space 50, and the gas passing through the cover body 311 can enter the interior of the pressing ring 315, and flow to the preset space 50 through the exhaust hole 3151, and finally flow out through the preset space 50.

[0052] It should be noted that, when the cover body 311 is also provided with a mounting groove 3113 and a vent hole 3112, the pressure ring 315 can be arranged in the mounting groove 3113, and the internal space of the pressure ring 315 is connected to the vent hole 3112, so that the gas in the mounting cavity 40 can flow out of the vent hole 3112, enter the interior of the pressure ring 315, and then flow out through the exhaust hole 3151.

[0053] In addition, in some embodiments, the blocking member 102 may have different configurations, and the following two configurations are specifically described as examples:

[0054] Method 1: If Figure 6 As shown, the blocking member 102 is a block 1021, which is connected to the hole wall of the mounting hole 101. In the axial direction of the mounting hole 101, the projection of the block 1021 on the surface of the cover body 311 facing the piston rod 312 and the projection of the elastic member on the surface of the cover body 311 facing the piston rod 312 at least partially overlap, and the projection of the block 1021 on the surface of the cover body 311 facing the piston rod 312 and the projection of the piston rod 312 on the surface of the cover body 311 facing the piston rod 312 do not overlap.

[0055] The blocking member 102 is a block 1021, and the block 1021 is connected to the hole wall of the mounting hole 101 so that the block 1021 is fixed in the mounting hole 101. Since the projection of the block 1021 on the surface of the cover body 311 facing the piston rod 312 overlaps with at least part of the projection of the elastic member, the block 1021 can abut against the elastic member to support the elastic member, which can avoid the problem that the elastic member cannot abut against the block 1021 due to the small size of the block 1021, and then the elastic member cannot be installed. Since the projection of the block 1021 does not overlap with the projection of the piston rod 312, when the piston rod 312 moves, there will be no interference between the piston rod 312 and the block 1021, which can avoid the problem that the setting of the block 1021 affects the movement of the piston rod 312.

[0056] Method 2: The blocking member 102 is a retaining ring 1022, and an avoidance hole 1023 is arranged inside the retaining ring 1022. The retaining ring 1022 is connected to the hole wall of the mounting hole 101, and the piston rod 312 is penetrated through the avoidance hole 1023. In the axial direction of the mounting hole 101, the projection of the retaining ring 1022 on the surface of the cover body 311 facing the piston rod 312 and the projection of the elastic member on the surface of the cover body 311 facing the piston rod 312 at least partially overlap, and the projection of the retaining ring 1022 on the surface of the cover body 311 facing the piston rod 312 and the projection of the piston rod 312 on the surface of the cover body 311 facing the piston rod 312 do not overlap.

[0057] The blocking member 102 is a retaining ring 1022, and a avoidance hole 1023 is arranged inside the retaining ring 1022. The outer wall of the retaining ring 1022 can be connected to the hole wall of the mounting hole 101, and the piston rod 312 is penetrated through the avoidance hole 1023, so that when the piston rod 312 moves in the mounting hole 101, the piston rod 312 can also move in the avoidance hole 1023, which can prevent the retaining ring 1022 from affecting the normal operation of the explosion-proof valve core 30. Since the projection of the retaining ring 1022 on the surface of the cover body 311 facing the piston rod 312 coincides with at least part of the projection of the elastic member, the retaining ring 1022 can abut against the elastic member and play a supporting role for the elastic member, which can prevent the avoidance hole 1023 from being too large, resulting in the elastic member and the retaining ring 1022 being unable to abut, and then the elastic member cannot be installed. Since the projection of the retaining ring 1022 does not overlap with the projection of the piston rod 312, when the piston rod 312 moves, there will be no interference between the piston rod 312 and the retaining ring 1022, thereby avoiding the problem that the setting of the retaining ring 1022 affects the movement of the piston rod 312.

[0058] In addition, the setting of the stopper 1021 makes the blocking member 102 have less influence on the gas flow. Specifically, the stopper 1022 is an annular structure. After the stopper 1022 is installed in the mounting hole 101, the outer wall of the stopper 1022 is connected to the inner wall of the mounting hole 101, so that the stopper 1022 is in the space between the mounting hole 101 and the piston rod 312, and blocks the gas flow space all around the piston rod 312, resulting in a smaller gas flow space, with only part of the space between the avoidance hole 1023 and the piston rod 312. However, the stopper 1021 is only connected to part of the interior of the mounting hole 101, and can only block the gas flow space at part of the piston rod 312, while at the position where the stopper 1021 is not set, the gas can flow normally, which can make the gas flow space larger and facilitate rapid pressure relief.

[0059] In order to reduce the influence of the setting of the retaining ring 1022 on the pressure relief speed, some through holes for gas circulation can be set on the retaining ring. On the surface of the cover body 311 facing the piston rod 312, the projection of the through holes is located between the projection of the piston rod 312 and the projection of the inner wall of the mounting hole 101.

[0060] In addition, in some embodiments, a countersunk hole 1011 may be provided on the surface of the upper cover 20 or the lower box body 10 facing away from the installation cavity 40, and a second through hole 1012 may be provided at the bottom of the countersunk hole 1011. The countersunk hole 1011 and the second through hole 1012 form a mounting hole 101, and the cover body 311 is disposed in the countersunk hole 1011, and the surface of the cover body 311 facing the piston rod 312 abuts against the bottom of the countersunk hole 1011, and the blocking member 102 is disposed in the second through hole 1012 and connected to the hole wall of the second through hole 1012.

[0061] A counterbore 1011 is provided on the surface of the upper cover 20 or the lower box body 10 facing away from the installation cavity 40, and a second through hole 1012 is provided at the bottom of the counterbore 1011. The counterbore 1011 and the second through hole 1012 can form a mounting hole 101 to provide a mounting space for the piston rod 312 and the cover body 311. Specifically, the cover body 311 can be disposed in the counterbore 1011, and the piston rod 312 can be located in the second through hole 1012, so that the cover body 311 and the piston rod 312 can be distributed in the mounting hole 101 along the direction from the outside of the installation cavity 40 to the inside of the installation cavity 40. In addition, the countersunk hole 1011 can also be used to fix the installation of the explosion-proof valve core 30. Specifically, the elastic member can be in a pre-stressing device, and the surface of the cover body 311 facing the piston rod 312 abuts against the bottom of the countersunk hole 1011. Since the elastic member is located between the fixing member 3121 and the blocking member 102, the elastic member can apply a force to the fixing member 3121 in the direction close to the installation cavity 40 under the action of its own elastic potential energy, so that the cover body 311 will also have a tendency to move toward the installation cavity 40, so that the cover body 311 can abut well against the bottom of the countersunk hole 1011, thereby fixing the explosion-proof valve core 30.

[0062] In addition, in some embodiments, a groove 1013 may be provided at the bottom of the counterbore 1011 , a seal 1014 is provided in the groove 1013 , and the seal 1014 abuts against the surface of the cover body 311 facing the piston rod 312 .

[0063] A groove 1013 is provided at the bottom of the counterbore 1011, and a seal 1014 can be provided in the groove 1013, and the seal 1014 is made to abut against the surface of the cover body 311 facing the piston rod 312, so that the space between the cover body 311 and the bottom of the counterbore 1011 can be sealed, thereby preventing gas from flowing through the gap between the cover body 311 and the counterbore 1011, thereby causing the explosion-proof valve core 30 to lose its function.

[0064] The battery pack 100 includes a single battery, a lower box 10, an upper cover 20, and an explosion-proof valve core 30, wherein the lower box 10 can be connected to the upper cover 20 to form a mounting cavity 40, and the mounting cavity 40 can provide a mounting space for the single battery. A mounting hole 101 is provided on the lower box 10 or the upper cover 20, and the mounting hole 101 is connected to the mounting cavity 40, so that the gas in the mounting cavity 40 can exchange gas with the outside through the mounting hole 101. The explosion-proof valve core 30 is arranged in the mounting hole 101, and the explosion-proof valve core 30 can move along the axial direction of the mounting hole 101, so that the explosion-proof valve core 30 can close the mounting hole 101 or connect the mounting hole 101. When the battery pack 100 is working normally, the explosion-proof valve core 30 can close the mounting hole 101, and the mounting cavity 40 can exchange gas with the outside through the explosion-proof valve core 30. At this time, the explosion-proof valve core 30 plays a breathing role; in the case of thermal runaway of the battery pack 100, the explosion-proof valve core 30 can move to make the mounting hole 101 in a conducting state. At this time, the mounting cavity 40 can be directly connected to the outside through the mounting hole 101, and the gas in the mounting cavity 40 can flow out through the mounting hole 101, thereby quickly reducing the pressure in the mounting cavity 40 to prevent the mounting cavity 40 from exploding. At this time, the explosion-proof valve core 30 plays an explosion-proof role. Specifically, the explosion-proof valve core 30 in the installation cavity 40 includes a cover body 311 and a piston rod 312, and the cover body 311 and the piston rod 312 are distributed in the installation hole 101 along the direction from the outside of the installation cavity 40 to the inside of the installation cavity 40, that is, the piston rod 312 is located on a side close to the installation cavity 40, and the cover body 311 is located on a side away from the installation cavity 40. The first end of the piston rod 312 can be connected to the cover body 311, that is, the piston rod 312 and the cover body 311 are connected to each other and can move synchronously in the installation hole 101, so that the cover body 311 can close the installation hole 101 to realize the breathing effect of the explosion-proof valve core 30, or conduct the installation hole 101 to realize the explosion-proof effect of the explosion-proof valve core 30.

[0065] In the embodiment of the utility model, a mounting hole 101 is provided on the lower box body 10 or the upper cover 20, and the explosion-proof valve core 30 is directly arranged in the mounting hole 101. The mounting hole 101 can provide a mounting position for the explosion-proof valve core 30. The lower box body 10 or the upper cover 20 can serve as a shell of the explosion-proof valve core 30. The explosion-proof valve core 30 is integrated into the lower box body 10 or the upper cover 20 to realize the integration of the box body and the explosion-proof valve system, which can improve the molding efficiency of the battery pack 100, reduce assembly defects, and reduce costs.

[0066] In addition, an embodiment of the utility model further provides an electric device, which includes the battery pack 100 in any one of the above embodiments.

[0067] The electrical equipment proposed in the embodiment of the present utility model is provided with the above-mentioned battery pack 100. In the battery pack 100, the explosion-proof valve core 30 is directly integrated on the lower box body 10 or the upper cover 20. The lower box body 10 or the upper cover 20 can serve as the shell of the explosion-proof valve core 30, and the box body and the explosion-proof valve system can be integrated, thereby achieving the effect of improving the molding efficiency of the battery pack 100, reducing assembly defects, reducing costs, and improving the safety of the electrical equipment.

[0068] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0069] Although the optional embodiments of the utility model embodiments have been described, those skilled in the art, once knowing the basic creative concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications falling within the scope of the utility model embodiments.

[0070] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0071] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack (100), characterized in that: The battery pack (100) comprises a single battery, a lower box (10), an upper cover (20) and an explosion-proof valve core (30); the lower box (10) and the upper cover (20) are connected to form a mounting cavity (40); the single battery is arranged in the mounting cavity (40); a mounting hole (101) is arranged on the lower box (10) or the upper cover (20); the mounting hole (101) is connected to the mounting cavity (40); the explosion-proof valve core (30) is arranged in the mounting hole (101), and the explosion-proof valve core (30) can move along the axial direction of the mounting hole (101) so that the explosion-proof valve core (30) closes the mounting hole (101) or opens the mounting hole (101); The explosion-proof valve core (30) comprises a cover body (311) and a piston rod (312). The cover body (311) and the piston rod (312) are distributed in the mounting hole (101) along the direction from the outside of the mounting cavity (40) to the inside of the mounting cavity (40). In the axial direction of the mounting hole (101), the piston rod (312) has a first end and a second end opposite to each other. The first end of the piston rod (312) is connected to the cover body (311), and the second end of the piston rod (312) faces the inside of the mounting cavity (40). The piston rod (312) and the cover body (311) can both move along the axial direction of the mounting hole (101), and the cover body (311) can close the mounting hole (101) or open the mounting hole (101).

2. The battery pack (100) according to claim 1, characterized in that: The explosion-proof valve core (30) further comprises a driving member (313), wherein the driving member (313) is arranged in the mounting hole (101), and the driving member (313) is connected to the piston rod (312) and the hole wall of the mounting hole (101), and the driving member (313) is used to drive the piston rod (312) to move so that the cover body (311) closes the mounting hole (101) or opens the mounting hole (101).

3. The battery pack (100) according to claim 2, characterized in that: The driving member (313) is an elastic member, a blocking member (102) is provided on the hole wall of the mounting hole (101), a fixing member (3121) is provided on the second end of the piston rod (312), the driving member (313) is sleeved on the piston rod (312), the driving member (313) is located between the fixing member (3121) and the blocking member (102), the driving member (313) is in contact with the fixing member (3121) and the blocking member (102), the fixing member (3121) is close to the mounting cavity (40), and the blocking member (102) is far away from the mounting cavity (40); When the elastic member is extended or retracted, the driving member (313) moves to drive the piston rod (312) to move, so that the cover body (311) closes the mounting hole (101) or opens the mounting hole (101).

4. The battery pack (100) according to claim 3, characterized in that: The cover body (311) is provided with a vent hole (3112), and the piston rod (312) is provided with a first through hole (3122), the first through hole (3122) penetrates the piston rod (312) along the axial direction of the piston rod (312), the first through hole (3122) is connected with the vent hole (3112) and the mounting cavity (40), and the cover body (311) is also provided with a waterproof and breathable membrane (314), and the waterproof and breathable membrane (314) covers the vent hole (3112).

5. The battery pack (100) according to claim 4, characterized in that: The cover body (311) is also provided with a mounting groove (3113), the vent hole (3112) runs through the bottom of the mounting groove (3113), the waterproof breathable membrane (314) is arranged in the mounting groove (3113), and the waterproof breathable membrane (314) covers the vent hole (3112).

6. The battery pack (100) according to claim 3, characterized in that: The explosion-proof valve core (30) further comprises a pressure plate (316) and a pressure ring (315), wherein the pressure ring (315) is connected to the cover body (311) and the pressure ring (315) protrudes from the cover body (311), the surface of the pressure ring (315) facing away from the cover body (311) is connected to the pressure plate (316), and a preset space (50) is provided between the pressure plate (316) and the cover body (311), and the portion of the pressure ring (315) protruding from the cover body (311) is provided with an exhaust hole (3151), and the exhaust hole (3151) penetrates the pressure ring (315) along the radial direction of the pressure ring (315), and the preset space (50) is communicated with the exhaust hole (3151).

7. The battery pack (100) according to claim 3, characterized in that: The blocking member (102) is a stopper (1021), and the stopper (1021) is connected to the hole wall of the mounting hole (101); in the axial direction of the mounting hole (101), a projection of the stopper (1021) on the surface of the cover body (311) facing the piston rod (312) and a projection of the elastic member on the surface of the cover body (311) facing the piston rod (312) at least partially overlap, and a projection of the stopper (1021) on the surface of the cover body (311) facing the piston rod (312) and a projection of the piston rod (312) on the surface of the cover body (311) facing the piston rod (312) do not overlap; Alternatively, the blocking member (102) is a retaining ring (1022), an avoidance hole (1023) is arranged inside the retaining ring (1022), the retaining ring (1022) is connected to the hole wall of the mounting hole (101), the piston rod (312) is passed through the avoidance hole (1023), and in the axial direction of the mounting hole (101), the projection of the retaining ring (1022) on the surface of the cover body (311) facing the piston rod (312) and the projection of the elastic member on the surface of the cover body (311) facing the piston rod (312) at least partially overlap, and the projection of the retaining ring (1022) on the surface of the cover body (311) facing the piston rod (312) and the projection of the piston rod (312) on the surface of the cover body (311) facing the piston rod (312) do not overlap.

8. The battery pack (100) according to claim 3, characterized in that: A countersunk hole (1011) is provided on the surface of the upper cover (20) or the lower box body (10) facing away from the installation cavity (40); a second through hole (1012) is provided at the bottom of the countersunk hole (1011); the countersunk hole (1011) and the second through hole (1012) form the installation hole (101); the cover body (311) is arranged in the countersunk hole (1011), and the surface of the cover body (311) facing the piston rod (312) abuts against the bottom of the countersunk hole (1011); the blocking member (102) is arranged in the second through hole (1012) and is connected to the hole wall of the second through hole (1012).

9. The battery pack (100) according to claim 8, characterized in that: A groove (1013) is provided at the bottom of the counterbore (1011), a sealing member (1014) is provided in the groove (1013), and the sealing member (1014) abuts against the surface of the cover body (311) facing the piston rod (312).

10. An electrical device, characterized in that: The electrical equipment comprises the battery pack (100) according to any one of claims 1 to 9.

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