CN220492095U - Battery pack - Google Patents

Abstract

The application discloses a battery pack. The battery pack comprises a box body assembly, wherein the box body assembly comprises a frame beam and a pressure release cover; the frame beam is surrounded to form a containing cavity, the frame beam is provided with an exhaust cavity, the frame beam is also provided with a first exhaust through hole and a second exhaust through hole which are communicated with the exhaust cavity, the exhaust cavity is communicated with the containing cavity through the first exhaust through hole, and the exhaust cavity is also communicated to the outside of the battery pack through the second exhaust through hole; the pressure release cover is movably connected with the frame beam, and seals the second exhaust through hole, and the pressure release cover can open the second exhaust through hole under the action of pressure difference between the exhaust cavity and the outside of the battery pack. The battery pack also comprises a single battery, and the single battery is accommodated in the accommodating cavity. The battery pack also includes an electrical module housed in the exhaust cavity. Through the mode, the risk of thermal runaway problem of battery package emergence can be reduced to this application to can effectively reduce the cost of battery package.

Description

Battery pack

Technical Field

The application relates to the technical field of batteries, in particular to a battery pack.

Background

With the growing maturity of lithium battery technology, electric automobiles play an increasingly important role in people's daily lives, but a plurality of potential safety hazards are also exposed at the same time. Among them, the thermal runaway problem of the battery pack is particularly remarkable. Through analysis, the thermal runaway problem of the battery pack is mainly because the heat generation rate in the battery pack is far greater than the heat dissipation rate, so that a large amount of high-temperature gas is accumulated in the battery pack, if the gas cannot be timely discharged from the battery pack, the thermal runaway problem of a single battery is very likely to be evolved into a plurality of thermal runaway problems of the whole battery pack, and the whole battery pack and even the whole vehicle are caused to have accidents such as fire or explosion.

When the thermal runaway problem occurs, ensuring the rapid discharge of high-temperature gas inside the battery pack is a key of safety design, preventing the thermal runaway problem of a single battery from further evolving into the thermal runaway problem of the whole battery pack to cause the ignition or explosion of the battery pack or the whole vehicle, and ensuring the life health and safety of drivers and passengers to a greater extent; meanwhile, the exhaust design with economy is beneficial to popularization and promotion of the electric automobile.

Disclosure of Invention

The application provides a battery pack, which can reduce the risk of thermal runaway problem of the battery pack and effectively reduce the cost of the battery pack.

The application provides a battery pack. The battery pack comprises a box body assembly, wherein the box body assembly comprises a frame beam and a pressure release cover; the frame beam is surrounded to form a containing cavity, the frame beam is provided with an exhaust cavity, the frame beam is also provided with a first exhaust through hole and a second exhaust through hole which are communicated with the exhaust cavity, the exhaust cavity is communicated with the containing cavity through the first exhaust through hole, and the exhaust cavity is also communicated to the outside of the battery pack through the second exhaust through hole; the pressure release cover is movably connected with the frame beam, and seals the second exhaust through hole, and the pressure release cover can open the second exhaust through hole under the action of pressure difference between the exhaust cavity and the outside of the battery pack. The battery pack also comprises a single battery, and the single battery is accommodated in the accommodating cavity. The battery pack also includes an electrical module housed in the exhaust cavity.

In an embodiment of the present application, the electrical module has a gap, or the electrical module has a gap between the electrical module and the frame beam, and the first exhaust through hole is in communication with the second exhaust through hole through the gap.

In an embodiment of the present application, the electrical module comprises a BDU module.

In an embodiment of the present application, the battery pack includes a preset direction, and the accommodating cavity and the second exhaust through hole are disposed opposite to each other along the preset direction; the box assembly further includes: the sliding rod is connected with the pressure release cover, the frame beam is also provided with a sliding groove extending along the preset direction, the sliding groove is mutually spaced from the exhaust cavity, and the sliding rod is movably embedded in the sliding groove; at least part of the venting cover can move in a direction away from the accommodating cavity to open the second venting through hole, and the sliding rod can move along a preset direction along with the movement of the venting cover.

In an embodiment of the application, the relief cap has relative first end and the second end that sets up, and first end and frame roof beam rotate to be connected, and the second end rotates with the slide bar to be connected, and the relief cap can rotate around first end and towards the direction of keeping away from the holding chamber to open the second exhaust through-hole.

In an embodiment of the present application, the case assembly further includes: and the connecting piece is respectively connected with the pressure release cover and the sliding rod in a rotating way.

In an embodiment of the present application, the number of the sliding rods is multiple, a part of the sliding rods are located at one side of the second exhaust through hole, the rest of the sliding rods are located at the other opposite side of the second exhaust through hole, and the pressure release cover is movably connected with the frame beam through each sliding rod.

In an embodiment of the present application, the case assembly further includes: the elastic piece is connected with the sliding rod and is used for driving the sliding rod to move so as to drive the pressure release cover to block the second exhaust through hole again.

In an embodiment of the present application, the sliding groove includes a first groove section and a second groove section that are mutually communicated, the first groove section is far away from the accommodating cavity relative to the second groove section, and the cross-sectional area of the first groove section is smaller than that of the second groove section, so as to form a step surface at the communication position of the first groove section and the second groove section; the sliding rod comprises a sliding part and an abutting part which are connected, the sliding part is connected with the pressure release cover, the sliding part is movably embedded in the first groove section, the abutting part is movably embedded in the second groove section, and the elastic piece is located between the step surface and the abutting part.

In an embodiment of the present application, the case assembly further includes: and the sealing piece is clamped between the pressure relief cover and the frame beam to seal the second exhaust through hole.

In an embodiment of the present application, the battery pack includes a preset direction, and the accommodating cavity and the second exhaust through hole are disposed opposite to each other along the preset direction; the first exhaust through hole and the second exhaust through hole are respectively positioned at two sides of the exhaust cavity in the preset direction.

The beneficial effects of this application are: unlike the prior art, the present application provides a battery pack. The frame beam of the battery pack is provided with an exhaust cavity and is also provided with a first exhaust through hole and a second exhaust through hole which are communicated with the exhaust cavity. The pressure release cover of the battery pack can open the second exhaust through hole under the action of the pressure difference between the exhaust cavity and the outside of the battery pack, so that high-temperature gas in the accommodating cavity is discharged through the first exhaust through hole, the exhaust cavity and the second exhaust through hole rapidly, and the risk of thermal runaway problem of the battery pack can be reduced. And, this application provides a simple and easy, efficient battery package exhaust design, compares with traditional explosion-proof valve and has lower cost, can effectively reduce the cost of battery package.

Further, the electrical module of the battery pack of the present application is accommodated in the exhaust cavity of the frame beam. In other words, the exhaust cavity of the battery pack can be reused as an installation bin of the electric module, so that the internal space of the battery pack can be saved, and the energy density of the battery pack can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an embodiment of a battery pack of the present application;

fig. 2 is a schematic view of an exploded structure of the battery pack shown in fig. 1;

FIG. 3 is a schematic view of an embodiment of a frame beam of the present application;

fig. 4 is a schematic cross-sectional structure of the battery pack shown in fig. 1;

fig. 5 is a schematic view of the structure of the battery pack a shown in fig. 4;

fig. 6 is a schematic view illustrating a structure of the battery pack of fig. 5 in another state;

FIG. 7 is a schematic view of another embodiment of a battery pack of the present application;

fig. 8 is an exploded view of the battery pack of fig. 7;

fig. 9 is a schematic cross-sectional structure of the battery pack shown in fig. 7;

fig. 10 is a schematic view of the structure of the battery pack B region shown in fig. 9;

fig. 11 is a schematic view of the structure of the battery pack of fig. 10 in another state;

fig. 12 is a schematic structural view of an embodiment of the connector of the present application.

Reference numerals illustrate:

10 battery packs; 11 an electrical module; 12 ventilation valves; 20 box components; a frame beam 21; 21a target beam; 211 exhaust chambers; 212 a first exhaust through hole; 213 a second exhaust through hole; 214 sliding grooves; 2141 a first trough section; 2142 a second trough section; 2143 step faces; 22, a pressure relief cover; 221 a first end; 222 a second end; 23 accommodation chambers; 24 sliding bar; 241 sliding part; 242 abutment; 25 connectors; an elastic member 26; 27 seals.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of the art without inventive effort. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper", "lower", "left" and "right" are generally used to refer to the directions of the drawings in which the device is actually used or in an operating state.

In the present application, unless explicitly specified and limited otherwise, the terms "connected," "stacked," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The present application provides a battery pack, which will be described in detail below. It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

In order to solve the technical problems of high risk of thermal runaway and high cost of a battery pack in the prior art, an embodiment of the present application provides a battery pack. The battery pack comprises a box body assembly, wherein the box body assembly comprises a frame beam and a pressure release cover; the frame beam is surrounded to form a containing cavity, the frame beam is provided with an exhaust cavity, the frame beam is also provided with a first exhaust through hole and a second exhaust through hole which are communicated with the exhaust cavity, the exhaust cavity is communicated with the containing cavity through the first exhaust through hole, and the exhaust cavity is also communicated to the outside of the battery pack through the second exhaust through hole; the pressure release cover is movably connected with the frame beam, and seals the second exhaust through hole, and the pressure release cover can open the second exhaust through hole under the action of pressure difference between the exhaust cavity and the outside of the battery pack. The battery pack also comprises a single battery, and the single battery is accommodated in the accommodating cavity. The battery pack also includes an electrical module housed in the exhaust cavity. As will be described in detail below.

Referring to fig. 1 and 2, fig. 1 is a schematic structural view of an embodiment of a battery pack according to the present application, and fig. 2 is a schematic exploded structural view of the battery pack shown in fig. 1.

In one embodiment, the power device includes a battery pack 10, and the battery pack 10 is a power supply of the power device. The battery pack 10 includes a case assembly 20 and a unit cell accommodated in the case assembly 20. The unit cell includes, but is not limited to, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, to which the embodiments of the present disclosure are not limited. The electric device can be a mobile phone, portable equipment, a notebook computer, a battery car, an electric automobile, a ship, a spacecraft, an electric toy, an electric tool and the like. For example, spacecraft include airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, electric planers, and the like.

The battery pack 10 further includes an electrical module 11, the electrical module 11 is accommodated in the case assembly 20, and the electrical module 11 is used for controlling the battery cells to be charged and/or discharged. In particular, the electrical module 11 may include a BDU (Battery energy Distribution Unit ) module. Of course, in other embodiments of the present application, the electrical module 11 is not limited to the BDU module, and the electrical module 11 may also be other electronic devices in the battery pack 10, which is not limited herein.

The case assembly 20 of the embodiment of the present application is explained below.

Referring to fig. 3 to 6, fig. 3 is a schematic structural diagram of an embodiment of a frame beam of the present application, fig. 4 is a schematic structural diagram of a section of the battery pack shown in fig. 1, fig. 5 is a schematic structural diagram of an area a of the battery pack shown in fig. 4, and fig. 6 is a schematic structural diagram of another state of the battery pack shown in fig. 5.

In one embodiment, the box assembly 20 includes a frame beam 21, and the frame beam 21 encloses a housing cavity 23, and the unit cells are housed in the housing cavity 23. For example, the frame beam 21 may include at least four beams, each of which is connected in sequence, and two adjacent beams are perpendicular to each other, and each of the beams cooperates to define the accommodating cavity 23. Of course, the box assembly 20 may further include an upper cover and a lower cover, where the upper cover is disposed on the top of the accommodating cavity 23, and the lower cover is disposed on the bottom of the accommodating cavity 23, so that the accommodating cavity 23 forms a relatively airtight space.

The frame beam 21 has an exhaust cavity 211, and the frame beam 21 is further provided with a first exhaust through hole 212 and a second exhaust through hole 213, and the first exhaust through hole 212 and the second exhaust through hole 213 are both communicated with the exhaust cavity 211. The exhaust chamber 211 communicates with the receiving chamber 23 through a first exhaust through hole 212, and the exhaust chamber 211 also communicates to the outside of the battery pack 10 through a second exhaust through hole 213. The first exhaust through hole 212 and the second exhaust through hole 213 may be located on the same beam of the frame beam 21, and the exhaust cavity 211 is correspondingly located in the beam where the first exhaust through hole 212 and the second exhaust through hole 213 are located; alternatively, the first exhaust through hole 212 and the second exhaust through hole 213 are respectively located on different beams of the frame beam 21, and at this time, a part of the exhaust chamber 211 is located in the beam where the first exhaust through hole 212 is located, and another part of the exhaust chamber 211 is located in the beam where the second exhaust through hole 213 is located. For example, the frame beam 21 includes a target beam 21a, and the exhaust chamber 211, the first exhaust through hole 212, and the second exhaust through hole 213 are all located on the target beam 21a. The battery pack 10 includes a preset direction (as shown by arrow X in fig. 5, the following is the same), the accommodating cavity 23 and the second exhaust through hole 213 are disposed opposite to each other along the preset direction, specifically, the accommodating cavity 23, the first exhaust through hole 212, the exhaust cavity 211, and the second exhaust through hole 213 are sequentially disposed along the preset direction, and the first exhaust through hole 212 and the second exhaust through hole 213 are respectively located at two sides of the exhaust cavity 211 in the preset direction.

The tank assembly 20 also includes a relief cap 22. The pressure release cover 22 is movably connected with the frame beam 21, specifically, the pressure release cover 22 is movably connected with the target beam 21a. The relief cap 22 blocks the second vent hole 213, and the relief cap 22 can open the second vent hole 213 under the pressure difference between the vent cavity 211 and the outside of the battery pack 10. When the thermal runaway problem occurs in the unit cell, the high-temperature gas in the accommodating cavity 23 is discharged into the exhaust cavity 211 through the first exhaust through hole 212, so that the air pressure in the exhaust cavity 211 is larger than the air pressure outside the battery pack 10, and at this time, under the action of the pressure difference between the exhaust cavity 211 and the outside of the battery pack 10, the pressure release cover 22 opens the second exhaust through hole 213, so that the high-temperature gas in the exhaust cavity 211 is rapidly discharged to the outside of the battery pack 10 through the second exhaust through hole 213, and then the temperature inside the battery pack 10 is rapidly reduced to play a role in preventing thermal diffusion. In other words, the present embodiment can reduce the risk of thermal runaway problems of the battery pack 10. In addition, the present embodiment provides a simple and efficient exhaust design of the battery pack 10, which has lower cost compared with the traditional explosion-proof valve, can simplify the structure of the battery pack 10, and effectively reduces the cost of the battery pack 10.

The electrical module 11 of the battery pack 10 is accommodated in the exhaust chamber 211. In other words, the exhaust chamber 211 of the present embodiment is also multiplexed as the installation cabin of the electrical module 11, so that the internal space of the battery pack 10 can be saved, thereby being beneficial to improving the energy density of the battery pack 10. Specifically, the electrical module 11 has a gap, or a gap between the electrical module 11 and the frame beam 21, through which the first exhaust through-hole 212 is in communication with the second exhaust through-hole 213, so that the high-temperature gas discharged into the exhaust chamber 211 can reach the second exhaust through-hole 213 through the gap, and then be discharged to the outside of the battery pack 10 through the second exhaust through-hole 213.

The frame beam 21 of the present embodiment has multiple functions. First, the frame beam 21 of the present embodiment may be made of a metal material such as an aluminum alloy, and the frame beam 21 is one of the main structures of the box assembly 20, and the frame beam 21 acts as a bearing force to bear external impact and extrusion. Next, the frame beam 21 of the present embodiment is also applied to the exhaust design of the battery pack 10, and the exhaust chamber 211, the first exhaust through hole 212, the second exhaust through hole 213, the exhaust cap 22, and other structures related to the exhaust design are located on the frame beam 21 (i.e., the target beam 21 a). Furthermore, the exhaust cavity 211 inside the frame beam 21 (i.e., the target beam 21 a) is also multiplexed as an installation bin of the electrical module 11 to save the internal space of the battery pack 10. The case assembly 20 further includes an air-permeable valve 12, and the air-permeable valve 12 is disposed on the frame beam 21, specifically, the target beam 21a. The ventilation valve 12 has a pressure balancing function, and a microporous membrane can be arranged in the valve, and can filter particles such as water, dust and the like without blocking free passage of gas molecules, so that the waterproof and ventilation effects can be well realized. Under normal pressure conditions, the internal and external pressure balance of the battery pack 10 is dynamically realized through the internal and external gas exchange of the battery pack 10, and the installation position and the number of the ventilation valves 12 can be adjusted according to requirements.

The following describes the manner of the movable connection between the pressure release cover 22 and the frame beam 21 according to the embodiment of the present application.

In one embodiment, the housing assembly 20 further includes a slide bar 24, the slide bar 24 being coupled to the pressure relief cap 22. The frame beam 21 further has a sliding groove 214 extending in a predetermined direction, and the sliding groove 214 is specifically located on the target beam 21a. The sliding groove 214 is spaced apart from the exhaust chamber 211. The slide bar 24 is movably embedded in the slide groove 214. At least part of the relief cap 22 is movable in a direction away from the accommodating chamber 23 to open the second vent through hole 213, and the slide rod 24 is movable in a preset direction along with the movement of the relief cap 22.

In an embodiment, the entire relief cap 22 is translatable away from the receiving cavity 23 such that the entire relief cap 22 is away from the target beam 21a, thereby opening the second vent through hole 213. Under the action of the pressure difference between the venting cavity 211 and the outside of the battery pack 10, the air pressure in the venting cavity 211 acts on the venting cover 22, so that the entire venting cover 22 moves away from the accommodating cavity 23 to open the second venting through hole 213, and the sliding rod 24 moves along the sliding groove 214 along with the movement of the venting cover 22.

Further, the number of the slide bars 24 is plural, a part of the slide bars 24 is located at one side of the second exhaust through hole 213, the rest of the slide bars 24 are located at the other side opposite to the second exhaust through hole 213, and the pressure release cover 22 is movably connected to the frame beam 21 through each slide bar 24. For example, part of the slide bars 24 are located at the upper side of the second exhaust through hole 213, and the rest of the slide bars 24 are located at the lower side of the second exhaust through hole 213, and the number and arrangement positions of the slide grooves 214 are in one-to-one correspondence with the slide bars 24.

In one embodiment, the sliding groove 214 includes a first groove section 2141 and a second groove section 2142 that are in communication with each other. The first trough section 2141 is remote from the receiving cavity 23 relative to the second trough section 2142. The cross-sectional area of the first slot segment 2141 is smaller than the cross-sectional area of the second slot segment 2142 to form a step surface 2143 at the communication of the first slot segment 2141 and the second slot segment 2142. It will be appreciated that the cross-section of the first slot segment 2141 and the cross-section of the second slot segment 2142 are cross-sections perpendicular to the above-mentioned predetermined direction.

The slide lever 24 includes a connected slide portion 241 and an abutment portion 242. The sliding portion 241 is connected to the relief cap 22, and the sliding portion 241 is movably embedded in the first groove section 2141. The abutting portion 242 is movably embedded in the second groove section 2142. During the movement of the entire relief cap 22 in a direction away from the accommodation chamber 23, the sliding portion 241 moves along the first groove section 2141, and the abutment portion 242 moves along the second groove section 2142. The step surface 2143 serves to limit the abutment 242 to prevent the slide bar 24 from being removed from the slide groove 214.

The end of the sliding portion 241 remote from the abutting portion 242 is provided with an axial threaded blind hole, and the relief cap 22 is locked to the end of the sliding portion 241 by a fastener such as a seal bolt. The sealing bolt can ensure the tightness of the joint of the pressure relief cover 22 and the sliding rod 24, thereby ensuring that the internal space of the battery pack 10 has good tightness.

In one embodiment, the housing assembly 20 further includes a resilient member 26. The elastic member 26 is connected to the sliding rod 24, and the elastic member 26 is used for driving the sliding rod 24 to move to drive the venting cover 22 to reseal the second venting through hole 213. Under the action of the pressure difference between the venting cavity 211 and the outside of the battery pack 10, the gas pressure applied to the pressure relief cover 22 overcomes the elastic restoring force of the elastic member 26, so that the whole pressure relief cover 22 moves in a direction away from the accommodating cavity 23 to open the second venting through hole 213, at this time, the sliding rod 24 moves along with the pressure relief cover 22 to drive the elastic member 26 to elastically deform, and then the elastic member 26 provides the elastic restoring force to drive the sliding rod 24 to reversely move, so as to drive the whole pressure relief cover 22 to move towards the accommodating cavity 23 to re-seal the second venting through hole 213. In other words, the venting design of the battery pack 10 of the present embodiment can be reused multiple times.

Specifically, the elastic member 26 is located between the step surface 2143 and the abutment 242. Under the action of the pressure difference between the venting cavity 211 and the outside of the battery pack 10, the gas pressure applied to the pressure relief cover 22 overcomes the elastic restoring force of the elastic member 26, so that the whole pressure relief cover 22 moves in a direction away from the accommodating cavity 23 to open the second venting through hole 213, at this time, the sliding rod 24 moves along with the pressure relief cover 22 to compress the elastic member 26, and then the elastic member 26 stretches to drive the sliding rod 24 to move reversely, so as to drive the whole pressure relief cover 22 to move towards the accommodating cavity 23 to reseal the second venting through hole 213. Alternatively, the elastic member 26 may be an elastic element such as a spring or rubber, the elastic member 26 is sleeved on the outer periphery of the sliding portion 241 of the sliding rod 24, and the elastic member 26 is sandwiched between the step surface 2143 and the abutment portion 242. The number of elastic members 26 may be the same as the number of slide bars 24, i.e., the elastic members 26 are in one-to-one correspondence with the slide bars 24.

Let P be the air pressure of the exhaust chamber 211, S be the effective pressure receiving area of the pressure release cover 22, K be the Hooke' S coefficient of the elastic member 26, ΔL be the length variation of the elastic member 26, satisfying: p=s=k×Δl. When a thermal runaway problem occurs in the unit cells in the battery pack 10, a large amount of high-temperature and high-pressure gas enters the gas discharge chamber 211 through the first gas discharge through-hole 212 on the target beam 21a, and the gas pressure acts on the gas discharge cap 22. When the pressure acting on the pressure release cover 22 is greater than the elastic force of the elastic member 26, the elastic member 26 starts to be compressed, the sliding rod 24 moves outward, the pressure release cover 22 moves outward along with the sliding rod 24 to open the second exhaust through hole 213, the high pressure gas can be discharged through the gap between the pressure release cover 22 and the target beam 21a, at this time, the gas pressure in the battery pack 10 is reduced, fig. 6 exemplarily shows a state in which the pressure release cover 22 opens the second exhaust through hole 213, and the gas flow direction is shown by the dotted arrow in fig. 6; when the pressure acting on the relief cap 22 is smaller than the elastic force of the elastic member 26, the relief cap 22 moves slowly inward with the slide rod 24. The outward and inward movement of the venting cap 22 reciprocally cycles to maintain dynamic balance until no more high temperature and pressure gas is generated within the battery pack 10. The venting design of the battery pack 10 of the present embodiment has good stability and valve opening performance, and the venting cover 22 can be stably opened to discharge high-temperature and high-pressure gas when the thermal runaway problem occurs in the unit battery in the battery pack 10, so that the risk of the thermal runaway problem occurring in the battery pack 10 can be reduced.

In one embodiment, the tank assembly 20 further includes a seal 27. The seal member 27 is interposed between the relief cap 22 and the frame beam 21 to seal the second vent through hole 213. The seal member 27 is provided around the outer periphery of the second exhaust through hole 213. When the problem of thermal runaway does not occur in the single battery in the battery pack 10, the pressure release cover 22 and the frame beam 21 cooperate to clamp the sealing piece 27 so as to form a seal, so that the space in the battery pack 10 is relatively airtight, and the battery pack has good tightness and stability, and can be suitable for various working conditions (including multi-dust working conditions and the like). And, the elastic restoring force provided by the elastic piece 26 enables the pressure release cover 22 to be matched with the frame beam 21 stably to clamp the sealing piece 27, so that the tightness of the internal space of the battery pack 10 can be further ensured.

Referring to fig. 7 to 11 together, fig. 7 is a schematic structural view of another embodiment of the battery pack of the present application, fig. 8 is a schematic exploded structural view of the battery pack of fig. 7, fig. 9 is a schematic sectional structural view of the battery pack of fig. 7, fig. 10 is a schematic structural view of the battery pack B region of fig. 9, and fig. 11 is a schematic structural view of another state of the battery pack of fig. 10.

In an alternative embodiment, the present embodiment is different from the above-described embodiment in that the pressure release cover 22 can be rotated in a direction away from the accommodating chamber 23, so that the pressure release cover 22 is away from the target beam 21a, thereby opening the second exhaust through hole 213. Specifically, the pressure release cover 22 has a first end 221 and a second end 222 opposite to each other, the first end 221 is rotatably connected to the frame beam 21, and the second end 222 is rotatably connected to the sliding rod 24. Under the action of the pressure difference between the venting cavity 211 and the outside of the battery pack 10, the air pressure in the venting cavity 211 acts on the venting cover 22, so that the venting cover 22 can rotate around the first end 221 and in a direction away from the accommodating cavity 23 to open the second venting through hole 213, and the sliding rod 24 moves along the sliding groove 214 along with the movement of the venting cover 22. Fig. 11 exemplarily shows a state in which the pressure release cover 22 opens the second exhaust through hole 213, and the gas flow direction is indicated by the dotted arrow in fig. 11.

The first end 221 and the second end 222 of the pressure relief cap 22 may be two ends of the pressure relief cap 22 in the vertical direction, or the first end 221 and the second end 222 may be two ends of the pressure relief cap 22 in the horizontal direction. Fig. 10 and 11 exemplarily show that the first end 221 and the second end 222 are two ends of the pressure relief cover 22 in the vertical direction, which is only needed for discussion, and is not limited thereto. The number of the sliding rods 24 may be plural, each sliding rod 24 is located at the lower side of the second exhaust through hole 213, and each sliding rod 24 is rotatably connected with the pressure release cover 22. The number and arrangement positions of the slide grooves 214 are in one-to-one correspondence with the slide bars 24.

Optionally, referring to fig. 12, the case assembly 20 further includes a connector 25. The connecting pieces 25 are respectively connected with the pressure release cover 22 and the sliding rod 24 in a rotating way. One end of the connecting piece 25 may be pinned with the pressure relief cover 22 by a pin to achieve a rotational connection between the connecting piece 25 and the pressure relief cover 22. Similarly, the other end of the connecting member 25 may be pinned to the slide bar 24 by a pin to achieve a rotational connection between the connecting member 25 and the slide bar 24. In the process of rotating the pressure release cover 22 in the direction away from the accommodating cavity 23, the connecting piece 25 and the pressure release cover 22 and/or the connecting piece 25 and the sliding rod 24 synchronously rotate to support the rotating action of the pressure release cover 22, so as to ensure that the pressure release cover 22 stably opens the second exhaust through hole 213.

In summary, the present application provides a battery pack. The frame beam of the battery pack is provided with an exhaust cavity and is also provided with a first exhaust through hole and a second exhaust through hole which are communicated with the exhaust cavity. The pressure release cover of the battery pack can open the second exhaust through hole under the action of the pressure difference between the exhaust cavity and the outside of the battery pack, so that high-temperature gas in the accommodating cavity is discharged through the first exhaust through hole, the exhaust cavity and the second exhaust through hole rapidly, and the risk of thermal runaway problem of the battery pack can be reduced. And, this application provides a simple and easy, efficient battery package exhaust design, compares with traditional explosion-proof valve and has lower cost, can effectively reduce the cost of battery package.

Further, the electrical module of the battery pack of the present application is accommodated in the exhaust cavity of the frame beam. In other words, the exhaust cavity of the battery pack can be reused as an installation bin of the electric module, so that the internal space of the battery pack can be saved, and the energy density of the battery pack can be improved.

The foregoing has outlined the detailed description of the battery pack provided herein, and the principles and embodiments of the present application have been described herein with the application of specific examples, the above examples being provided only to assist in the understanding of the method of the present application and the core ideas thereof; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims (11)

1. A battery pack, comprising:

the box body assembly comprises a frame beam and a pressure release cover; the frame beam is surrounded to form a containing cavity, the frame beam is provided with an exhaust cavity, the frame beam is further provided with a first exhaust through hole and a second exhaust through hole which are communicated with the exhaust cavity, the exhaust cavity is communicated with the containing cavity through the first exhaust through hole, and the exhaust cavity is further communicated to the outside of the battery pack through the second exhaust through hole; the pressure release cover is movably connected with the frame beam, the pressure release cover seals the second exhaust through hole, and the pressure release cover can open the second exhaust through hole under the action of pressure difference between the exhaust cavity and the outside of the battery pack;

the single battery is accommodated in the accommodating cavity; and

and the electrical module is accommodated in the exhaust cavity.

2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

the electric module is provided with a gap, or the electric module and the frame beam are provided with a gap, and the first exhaust through hole is communicated with the second exhaust through hole through the gap.

3. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

the electrical module includes a BDU module.

4. The battery pack according to any one of claim 1 to 3, wherein,

the battery pack comprises a preset direction, and the accommodating cavity and the second exhaust through hole are oppositely arranged along the preset direction;

the box assembly further includes:

the sliding rod is connected with the pressure release cover, the frame beam is further provided with a sliding groove extending along the preset direction, the sliding groove is mutually spaced from the exhaust cavity, and the sliding rod is movably embedded in the sliding groove; at least part of the pressure release cover can move towards the direction far away from the accommodating cavity to open the second exhaust through hole, and the sliding rod can move along the preset direction along with the movement of the pressure release cover.

5. The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,

the pressure release cover has relative first end and the second end that sets up, first end with the frame roof beam rotates to be connected, the second end with the slide bar rotates to be connected, the pressure release cover can wind first end and towards keeping away from the direction of holding chamber rotates, in order to open the second exhaust through-hole.

6. The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

the box assembly further includes:

and the connecting piece is respectively connected with the pressure release cover and the sliding rod in a rotating way.

7. The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,

the number of the sliding rods is multiple, part of the sliding rods are located on one side of the second exhaust through hole, the rest of the sliding rods are located on the other side opposite to the second exhaust through hole, and the pressure release cover is movably connected with the frame beam through the sliding rods.

8. The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,

the box assembly further includes:

the elastic piece is connected with the sliding rod and used for driving the sliding rod to move so as to drive the pressure release cover to block the second exhaust through hole again.

9. The battery pack of claim 8, wherein the battery pack comprises a plurality of battery cells,

the sliding groove comprises a first groove section and a second groove section which are communicated with each other, the first groove section is far away from the accommodating cavity relative to the second groove section, and the cross section area of the first groove section is smaller than that of the second groove section so as to form a step surface at the communication position of the first groove section and the second groove section;

the sliding rod comprises a sliding part and an abutting part which are connected, the sliding part is connected with the pressure release cover, the sliding part is movably embedded in the first groove section, the abutting part is movably embedded in the second groove section, and the elastic piece is located between the step surface and the abutting part.

10. The battery pack according to any one of claim 1 to 3, wherein,

the box assembly further includes:

and the sealing piece is clamped between the pressure release cover and the frame beam so as to seal the second exhaust through hole.

11. The battery pack according to any one of claim 1 to 3, wherein,

the battery pack comprises a preset direction, and the accommodating cavity and the second exhaust through hole are oppositely arranged along the preset direction;

the first exhaust through hole and the second exhaust through hole are respectively positioned at two sides of the exhaust cavity in the preset direction.