CN220753666U - Battery pack and electricity utilization device - Google Patents

Abstract

The application relates to the technical field of batteries and provides a battery pack and an electric device. According to the battery pack provided by the application, utilize apron and the bottom plate clamp battery cell of casing, with the bottom in battery cell of closely laminating of elastic heat insulating part, and then with the second pressure release portion that corresponds battery cell's explosion-proof valve setting on the elastic heat insulating part closely laminate in battery cell's bottom, make between the explosion-proof valve of second pressure release portion and battery cell in first direction zero clearance, and because in the first direction, the projection of explosion-proof valve is located corresponding second pressure release portion, when the explosion-proof valve is opened, the material that erupts in the battery cell can flow into the pressure release passageway in the bottom plate through first pressure release portion on second pressure release portion and the bottom plate, and leak between these materials can not follow second pressure release portion and the explosion-proof valve of battery cell, thereby avoid these materials to cause other battery cells in the accommodation space to take place thermal runaway, the security performance of battery pack has been improved.

Description

Battery pack and electricity utilization device

Technical Field

The present disclosure relates to battery technology, and more particularly, to a battery pack and an electric device.

Background

In the prior art, when the explosion-proof valve is broken through due to thermal runaway of the single battery in the battery pack, electrolyte in the single battery can be sprayed into the box body of the battery pack, the sprayed electrolyte is high in temperature, and if other single batteries are touched, the thermal runaway of the other single batteries can be caused.

Therefore, a pressure release channel can be arranged in the box body of the battery pack, and the sprayed electrolyte is collected by the pressure release channel. However, in practical application, the single battery is usually fixed on the bottom plate of the box body by adopting structural adhesive, and the structural adhesive needs to avoid the explosion-proof valve, for the sake of simple process, the structural adhesive is usually only adhered on two opposite sides of the explosion-proof valve, and because the structural adhesive has a certain height, a gap is formed between the single battery and the bottom plate in the height direction of the battery pack, that is, a gap is formed between the explosion-proof valve of the single battery and the pressure release channel, when the electrolyte is sprayed out, the electrolyte may leak from the gap, and then flows to other single batteries to cause thermal runaway of other single batteries, so that potential safety hazards exist.

Disclosure of Invention

In view of the above, the present application provides a battery pack and an electric device, and aims to solve the above technical problems.

A first aspect of the present application provides a battery pack comprising:

the shell comprises a cover plate, a frame body and a bottom plate, wherein the cover plate and the bottom plate are respectively connected to two opposite ends of the frame body, and the cover plate, the bottom plate and the frame body enclose to form an accommodating space;

the single battery is arranged in the accommodating space, the battery pack is provided with a first direction, the single battery is provided with a top and a bottom which are oppositely arranged along the first direction, the cover plate is attached to the top, and the bottom plate is attached to the bottom so as to fix the single battery;

the elastic heat insulation piece is arranged between the single battery and the bottom plate, and the cover plate and the bottom plate compress the elastic heat insulation piece on the bottom;

the bottom is provided with an explosion-proof valve, a pressure relief channel is arranged in the bottom plate, a first pressure relief part communicated with the pressure relief channel is arranged at the position of the bottom plate corresponding to the explosion-proof valve, the elastic heat insulation piece corresponds to the explosion-proof valve, a second pressure relief part is arranged on the explosion-proof valve, the projection of the explosion-proof valve on the elastic heat insulation piece is positioned in the second pressure relief part in the first direction, and the projection of the second pressure relief part on the bottom plate is positioned in the first pressure relief part.

Optionally, the bottom plate has a first connecting portion, the first pressure release portion is located in the first connecting portion, the elastic heat insulating piece has a second connecting portion, the second pressure release portion is located in the second connecting portion, the second connecting portion with the first connecting portion corresponds, the second connecting portion closely laminate in the bottom, just the first connecting portion closely laminate in the second connecting portion.

Optionally, the battery pack further includes a circlip, where the circlip is disposed on the second connection portion and surrounds the second pressure relief portion, and one end of the circlip is abutted to the bottom and the other end of the circlip is abutted to the elastic heat insulation member along the first direction.

Optionally, the first connecting portion is towards the protruding first bellying that forms of bottom, the second connecting portion is towards the protruding second bellying that forms of bottom and in the elastic heat-proof element is towards the one end of bottom plate corresponds the formation depressed part, first bellying peg graft in the depressed part, the second bellying laminate in the bottom.

Optionally, the single battery is further provided with a pole, the single battery is further provided with a side part positioned between the top part and the bottom part, and the pole is positioned on the side part; or alternatively

The pole is located at the top, and the cover plate is connected to the pole.

Optionally, a heat exchange cavity is further arranged in the bottom plate, and the heat exchange cavities are arranged at intervals on one side of the pressure relief channel.

Optionally, a buffer cavity is further arranged in the bottom plate, and in the first direction, the buffer cavities are arranged at intervals at the bottom of the heat exchange cavity.

Optionally, the battery pack further includes an adhesive layer, the adhesive layer is located between the single battery and the elastic heat insulating member, and between the elastic heat insulating member and the bottom plate, the single battery, the elastic heat insulating member, and the bottom plate are fixed by the adhesive layer, and the adhesive layer avoids the first connection portion and the second connection portion.

A second aspect of the present application provides an electrical device comprising a battery pack as described above.

This application is provided with the pressure release passageway inside the bottom plate to set up first pressure release portion in the position that the bottom plate corresponds the explosion-proof valve of battery cell, the elastic heat insulating piece corresponds the explosion-proof valve and is equipped with second pressure release portion, and the explosion-proof valve can be through first pressure release portion and second pressure release portion and pressure release passageway intercommunication, when battery cell takes place thermal runaway, in can getting into the pressure release passageway through first pressure release portion and second pressure release portion from explosion-proof valve spun material like electrolyte, collects the electrolyte through the pressure release passageway, in order to avoid causing the thermal runaway and then lead to other battery cells to take place thermal runaway, improves the security performance. And in the first direction, the projection of the explosion-proof valve on the elastic heat insulation piece is positioned in the second pressure relief part, and the projection of the second pressure relief part on the bottom plate is positioned in the first pressure relief part, so that electrolyte sprayed out of the explosion-proof valve can enter the second pressure relief part from the first pressure relief part, and finally enter the pressure relief channel.

The utility model provides a still compress tightly elastic heat insulating piece in the bottom of battery cell through apron and bottom plate, compare and have the clearance between explosion-proof valve and the pressure release passageway of battery cell among the prior art, between explosion-proof valve and the elastic heat insulating piece of battery cell and between elastic heat insulating piece and the pressure release passageway gapless in this application, therefore can not leak from the clearance from explosion-proof valve spun electrolyte, and then reduce the electrolyte leakage and cause other battery cells to take place thermal runaway's risk, improve the security performance.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural view of a battery pack provided according to an embodiment of the present application;

fig. 2 shows a schematic diagram of an exploded view of a battery pack provided according to an embodiment of the present application;

FIG. 3 illustrates a schematic diagram of a top view of a bottom of a battery pack provided in accordance with an embodiment of the present application;

fig. 4 is a schematic view showing an arrangement of unit cells of a battery pack according to an embodiment of the present application;

fig. 5 shows a schematic diagram of a cross-sectional view of a battery pack provided according to an embodiment of the present application;

fig. 6 shows a schematic diagram of yet another cross-sectional view of a battery pack provided according to an embodiment of the present application.

Reference numerals:

10-a housing; 12-accommodation space; 14-a bottom plate; 16-a first pressure relief portion; 18-cover plate; 20-a frame; 22-single battery; 24-explosion-proof valve; 26-pole; 28-elastic insulation; 30-a second pressure relief portion; 32-a heat exchange cavity; 34-a pressure relief channel; z-first direction.

Detailed Description

The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.

According to a first aspect of embodiments of the present application, a battery pack is provided, and a structure and an operation principle of the battery pack will be described in detail with reference to fig. 1 to 6.

A battery pack according to an embodiment of the present application includes a housing 10, a battery cell 22, and an elastic heat insulator 28. The casing 10 includes a cover 18, a frame 20, and a bottom plate 14, where the cover 18 and the bottom plate 14 are respectively connected to opposite ends of the frame 20, and the cover 18, the bottom plate 14, and the frame 20 enclose an accommodating space 12. The unit battery 22 is disposed in the accommodating space 12, the battery pack has a first direction Z, the unit battery 22 has a top and a bottom disposed opposite to each other along the first direction Z, the cover 18 is attached to the top, and the bottom plate 14 is attached to the bottom to fix the unit battery 22. The elastic heat insulating piece 28, the elastic heat insulating piece 28 is arranged between the single battery 22 and the bottom plate 14, and the cover plate 18 and the bottom plate 14 compress the elastic heat insulating piece 28 at the bottom. The bottom is provided with an explosion-proof valve 24, a pressure relief channel 34 is arranged in the bottom plate 14, a first pressure relief part 16 communicated with the pressure relief channel 34 is arranged on the bottom plate 14 at a position corresponding to the explosion-proof valve 24, a second pressure relief part 30 is arranged on the elastic heat insulation piece 28 corresponding to the explosion-proof valve 24, the projection of the explosion-proof valve 24 on the elastic heat insulation piece 28 is positioned in the second pressure relief part 30 in the first direction Z, and the projection of the second pressure relief part 30 on the bottom plate 14 is positioned in the first pressure relief part 16.

In the present embodiment, the cover 18 is attached to the top, the bottom plate 14 is attached to the bottom, so as to fix the unit battery 22, specifically, the cover 18 is abutted to the top, the bottom plate 14 is abutted to the bottom, and the unit battery 22 is sandwiched between the cover 18 and the bottom plate 14 to fix the unit battery 22.

This application is provided with pressure release passageway 34 inside bottom plate 14 to set up first pressure release portion 16 in the position of bottom plate 14 corresponding explosion-proof valve 24 of battery cell 22, elastic heat insulating piece 28 corresponds explosion-proof valve 24 and is equipped with second pressure release portion 30, and explosion-proof valve 24 can be through first pressure release portion 16 and second pressure release portion 30 and pressure release passageway 34 intercommunication, when battery cell 22 takes place thermal runaway, in the material such as electrolyte from explosion-proof valve 24 can get into pressure release passageway 34 through first pressure release portion 16 and second pressure release portion 30, collect the electrolyte through pressure release passageway 34, so as to avoid causing the thermal runaway and then leading to other battery cells 22 to take place thermal runaway, improve the security performance. In the first direction, the projection of the explosion-proof valve 24 on the elastic heat insulating member 28 is located in the second pressure relief portion 30, and the projection of the second pressure relief portion 30 on the bottom plate 14 is located in the first pressure relief portion 16, so that electrolyte sprayed from the explosion-proof valve 24 can enter the second pressure relief portion 30 from the first pressure relief portion 16, and finally enter the pressure relief channel 34.

The application still compresses tightly elastic heat insulating piece 28 in the bottom of battery cell 22 through apron 18 and bottom plate 14, has the clearance between the explosion-proof valve of battery cell 22 and pressure release passageway 34 in the prior art, and no clearance between explosion-proof valve and elastic heat insulating piece 28 and between elastic heat insulating piece 28 and the pressure release passageway 34 in this application, therefore from explosion-proof valve 24 spun electrolyte can not leak in the clearance, and then reduces the electrolyte leakage and causes the risk that other battery cells 22 take place thermal runaway, improves the security performance.

It should be noted that, the purpose of pressing the elastic heat insulating member 28 against the bottom by the cover plate 18 and the bottom plate 14 is to prevent the electrolyte from leaking from the gap between the explosion-proof valve and the pressure release channel 34 of the unit cell 22, and the no gap is not meant to mean that there is no gap at all, but means that the no gap is attached to prevent the liquid from passing through, and in practical application, a small gap may be provided between the explosion-proof valve and the pressure release channel 34 of the unit cell 22, so long as the electrolyte is guaranteed not to leak from the gap.

In an embodiment, the elastic heat insulating member 28 may be a high-temperature resistant heat insulating cotton, which has the advantages of strong high-temperature stability, good elasticity, outstanding heat insulating effect, excellent corrosion resistance, and the like. By providing the resilient thermal barrier 28, the cell 22 is separated from the base plate 14, which is advantageous for further avoiding the cell 22 from being affected by heat from the material erupted by the explosion-proof valve 24 of a portion of the cell 22, thereby reducing the risk of thermal runaway of the cell 22.

In an embodiment, the inner part of the bottom plate 14 may be hollow to form the pressure release channel 34, and the hollow part may be communicated with each first pressure release part 16, so as to collect substances which are introduced by the first pressure release parts 16 and are sprayed from the explosion-proof valve 24, so as to avoid secondary damage to the single batteries 22 in the accommodating space 12 of the shell 10 and the external environment of the shell 10, and in an embodiment, the hollow part may also be communicated with the external environment of the shell 10, so as to accommodate a part of substances and guide the other part out of the shell 10, and the substances may also be stored through the hollow part.

In the exemplary embodiment, the first direction is to be understood as a direction defined by the top and bottom of the battery cells 22, or by the cover 18 and the base 14 of the housing 10, in other words, the top and bottom of the battery cells 22 are opposite one another in the first direction, and the cover 18 and the base 14 of the housing 10 are opposite one another in the first direction. Thus, in the case where, for example, the side of the bottom plate 14 facing the unit cells 22 (i.e., the side of the bottom plate 14 for defining the accommodation space 12) is a plane perpendicular to the first direction, the projection of the first pressure relief portion 16 along the first direction is substantially an orthographic projection on the plane. In addition, it should be noted that, in the embodiment, when the cover plate 18 of the housing 10 is located above and the bottom plate 14 is located below, the first direction is a vertical direction.

In an embodiment, in the first direction Z, the projection of the explosion proof valve 24 onto the resilient thermal insulation 28 is located within the second pressure relief portion 30, and the projection of the second pressure relief portion 30 onto the bottom plate 14 is located within the first pressure relief portion 16, it being understood that, as viewed along the first direction, the explosion proof valve 24 is located within the second pressure relief portion 30, and the second pressure relief portion 30 is located within the first pressure relief portion 16. This is advantageous in ensuring that the substance ejected from the explosion-proof valve 24 can be discharged to the outside of the accommodating space 12 via the first pressure relief portion 16. In the case where the explosion protection valve 24 is facing the first pressure relief portion 16, that is, in the case where the aforementioned projection is an orthographic projection of the explosion protection valve 24, the explosion protection valve 24 may have an external dimension smaller than or equal to the first pressure relief portion 16.

In an embodiment, a plurality of unit cells 22 may be disposed in the accommodating space 12, and the plurality of unit cells 22 may be arranged in an array in the accommodating space 12 in the manner of fig. 2 and 4, for example, wherein each unit cell 22 is clamped between the cover plate 18 and the bottom plate 14.

Further, in the embodiment, the housing 10 may have a box shape such as a rectangular parallelepiped shape, in other words, a rectangular parallelepiped shape box is formed by the cover plate 18, the bottom plate 14, and the frame 20 together.

The bottom plate 14 is further provided with a first connecting portion, the first pressure release portion 16 is located in the first connecting portion, the elastic heat insulation member 28 is provided with a second connecting portion, the second pressure release portion 30 is located in the second connecting portion, the second connecting portion corresponds to the first connecting portion, the second connecting portion is tightly attached to the bottom, the first connecting portion is tightly attached to the second connecting portion, and therefore electrolyte is effectively prevented from leaking between the explosion-proof valve of the single battery 22 and the pressure release channel 34. The structure of the second connection part may be the same as that of the first connection part.

Specifically, the bottom plate 14 is provided with a first connection portion corresponding to the explosion-proof valve 24 of each single battery 22, the elastic heat insulation member 28 is provided with a second connection portion corresponding to the explosion-proof valve 24 of each single battery 22, the first connection portion is tightly attached to the second connection portion, and the second connection portion is tightly attached to the bottom of the single battery 22, so that no gap exists between the explosion-proof valve of the single battery 22 and the pressure release channel 34. Therefore, in the embodiment, when the explosion-proof valve 24 of a part of the unit battery 22 is opened to spray out the substances, the substances are discharged out of the accommodating space 12 by the first pressure relief portion 16 and the second pressure relief portion 30, so that the thermal runaway of the rest of the unit battery 22 caused by the substances is avoided.

In an alternative embodiment, the battery pack further includes a circlip disposed on the second connection portion and surrounding the second pressure relief portion 30, and one end of the circlip abuts against the bottom portion along the first direction Z, and the other end abuts against the elastic heat insulation member 28.

In this embodiment, by adding the elastic retainer ring, for example, the sealing rubber ring, the elastic retainer ring is disposed around the second pressure relief portion 30 and also disposed around the explosion-proof valve 24, and two ends of the elastic retainer ring are respectively abutted against the bottom of the unit cell 22 and the elastic heat insulation member 28, so as to realize the circumferential sealing of the explosion-proof valve 24, and further effectively prevent the electrolyte from leaking between the explosion-proof valve of the unit cell 22 and the elastic heat insulation member 28. In some embodiments, circlips may be integrated onto the elastomeric insulation 28 to facilitate installation. In some embodiments, the circlip surrounds the second pressure relief portion 30, and when the structural adhesive is poured to form an adhesive layer, the elastic ring can prevent the structural adhesive from blocking the second pressure relief portion 30 and the explosion-proof valve 24, and the adhesive layer surrounds the second pressure relief portion 30 and the explosion-proof valve 24 to form a second seal, so that electrolyte is effectively prevented from leaking between the explosion-proof valve of the single battery 22 and the elastic heat insulating member 28.

In some embodiments, a circlip may be further disposed between the resilient thermal insulation 28 and the base plate 14, and the structure and principle thereof are the same as those of the above embodiments, and will not be described herein.

In an alternative embodiment, the first connection portion protrudes toward the bottom to form a first protruding portion, the second connection portion protrudes toward the bottom to form a second protruding portion, and a recess is correspondingly formed at an end of the elastic heat insulating member 28 toward the bottom plate 14, and the first protruding portion is inserted into the recess, and the second protruding portion is attached to the bottom.

When the cover plate 18 and the bottom plate 14 compress the elastic heat insulating member 28 to the bottom of the single battery 22, the first protruding portion is beneficial to realizing the close fitting of the elastic heat insulating member 28 to the bottom of the single battery 22, and the second protruding portion is beneficial to realizing the close fitting of the elastic heat insulating member 28 to the bottom plate 14, so as to ensure no gap between the explosion-proof valve and the pressure release channel 34 of the single battery 22. Meanwhile, through the arrangement of the first protruding portion and the insertion concave portion in an insertion fit mode, the installation and positioning of the elastic heat insulation piece 28 are facilitated, and meanwhile the first pressure relief portion 16 and the second pressure relief portion 30 are correspondingly arranged.

Further, the battery pack further includes an adhesive layer between the unit battery 22 and the elastic heat insulating member 28, and between the elastic heat insulating member 28 and the bottom plate 14, where the unit battery 22, the elastic heat insulating member 28, and the bottom plate 14 are fixed by the adhesive layer, and the adhesive layer avoids the first connection portion and the second connection portion. Specifically, the bonding layer surrounds first bellying and second bellying setting, set up the bellying and can prevent that the bonding layer shutoff explosion-proof valve 24, first pressure release portion 16 and second pressure release portion 30, reduce the degree of difficulty of encapsulating technology, and do benefit to when pressing from both sides through apron 18 and bottom plate 14 and establish battery cell 22, the second connecting portion can closely laminate the bottom of battery cell 22 and constitute first layer seal, the bonding layer surrounds the second connecting portion and constitutes second layer seal, and then effectively prevent leakage between explosion-proof valve and the pressure release passageway 34 of electrolyte from battery cell 22.

In an alternative embodiment, the battery cells 22 may also be provided with posts 26, the posts 26 may be positioned on top (i.e., with the posts 26 facing upward when the top is above and the bottom is below), and the cover 18 may be attached to the posts 26. For example, the battery pack also has a busbar assembly welded to the post 26 of each cell 22 to electrically connect the plurality of cells 22, where the cover 18 may be connected to an end of the busbar assembly facing away from the post 26; alternatively, the cover 18 may be attached to the top of the cell, such as by providing a buffer foam between the cover 18 and the top, through which the cover 18 compresses the cell 22.

In an alternative embodiment, the post 26 may be positioned on the bottom and on one side of the explosion proof valve 24 (i.e., with the post 26 facing downward when the top is above and the bottom is below), the bottom plate 14 may be connected to the post 26, e.g., the battery pack may also have a buss bar assembly welded to the post 26 of each cell 22 to electrically connect the plurality of cells 22, in which case the bottom plate 14 may be connected to the end of the buss bar assembly facing away from the post 26; alternatively, the base plate 14 may be attached to the bottom of the cell, such as by providing a buffer foam between the base plate 14 and the top, and the cover plate 18 compresses the cell 22 with the buffer foam.

In addition, in the embodiment, the first connection portion of the bottom plate 14 and the second connection portion of the elastic heat insulating member 28 avoid the pole 26, so as to avoid the pole 26 from affecting the close fitting between the first connection portion and the second connection portion and the bottom of the unit cell 22, which is more beneficial to ensure that the substance sprayed by the explosion-proof valve 24 can be completely discharged into the pressure release channel 34.

In an alternative embodiment, the bottom plate 14 may be further provided with a relief groove, and the elastic heat insulating member 28 may be correspondingly provided with a relief hole, where the relief groove and the relief hole may be disposed corresponding to the pole 26, for accommodating the pole 26. In this way, the space is provided by the avoidance groove and the avoidance hole to avoid the protruding pole 26, so that the bottom plate 14 and the bottom of the single battery 22 can be better attached.

In an alternative embodiment, the cell 22 may also have sides between the top and bottom, that is, in this example, the posts 26 of the cell 22 are in the form of side-out, the cover 18 fits over the top of the cell 22, the base 14 fits over the bottom of the cell 22, and the cover 18 sandwiches the cell 22 with the base 14 to effect the securement.

In an alternative embodiment, a heat exchange chamber 32 is also provided within the base plate 14, the heat exchange chamber 32 being spaced apart on one side of the pressure relief channel 34. As shown in fig. 6, the heat exchange chamber 32 and the pressure release channel 34 are at the same level, and the heat exchange chamber 32 is disposed at two opposite sides of the pressure release channel 34, it can be understood that when the single battery 22 is out of control, the temperature of the substance, such as the electrolyte, sprayed from the explosion-proof valve 24 is high, and the substance needs to be cooled. After the electrolyte enters the pressure release channel 34, the heat exchange cavity 32 can cool the electrolyte, and the electrolyte can directly contact the side wall of the heat exchange cavity 32, so that the cooling effect is good.

In an alternative embodiment, a buffer chamber (not shown) is also provided in the bottom plate 14, the buffer chamber being spaced apart from the bottom of the heat exchange chamber 32 in the first direction (Z). The buffer cavity is used for buffering bottom ball hits, and it can be understood that the buffer cavity interval sets up in the bottom of heat transfer cavity 32, avoids influencing the heat transfer function of heat transfer cavity 32 when receiving the ball hits and cause the damage in the bottom of bottom plate 14, improves the security performance of battery package.

In an alternative embodiment, the first pressure relief portion 16 and the second pressure relief portion 30 may be at least one of an explosion-proof film, a through hole, a weak portion, or a hot melt portion capable of melting and forming a channel at a set temperature. It will be appreciated that when thermal runaway occurs in the cell 22, substances such as electrolyte may be ejected through the explosion valve 24, which may have some kinetic energy to break the rupture membrane or the frangible portion into the pressure relief channel 34, and may be at a higher temperature to melt the hot melt portion into the pressure relief channel 34. Preferably, the first pressure release portion 16 and the second pressure release portion 30 are rupture membranes, weak portions or hot melt portions, and in a normal state, the first pressure release portion 16 and the second pressure release portion 30 are both closed, so that the air tightness of the battery pack is improved.

In an embodiment, as an example, the first pressure relief portion 16 and the second pressure relief portion 30 may each function as an explosion-proof membrane. For example, a through hole may be provided in the bottom plate 14, and the through hole may be closed with an explosion-proof film as the first pressure relief portion 16, and similarly, a through hole may be provided in the elastic heat insulating material 28, and the through hole may be closed with an explosion-proof film as the second pressure relief portion 30.

In an embodiment, as an example, the first pressure relief portion 16 and the second pressure relief portion 30 may be weak portions, for example, a portion with a smaller thickness is provided on the bottom plate 14 to serve as the weak portion, and when the corresponding explosion-proof valve 24 bursts, the weak portion is broken and opened under impact, and similarly, a portion with a smaller thickness may be provided on the elastic heat insulating member 28 to serve as the weak portion.

In addition, the weak portion may be separated from the surrounding material by a recessed groove portion, for example, a weak portion defined by a major arc-shaped groove portion may be provided on the bottom plate 14, and when the corresponding explosion-proof valve 24 is ejected, the weak portion defined by the major arc-shaped groove portion is separated from a portion other than the groove portion by a break at the groove portion, and similarly, the second pressure relief portion 30 may be provided. Further, the groove portion may be formed as a substantial score.

In an embodiment, the weak portion may also be a heat-fused portion, which may close a previously provided through hole, such as a through hole provided on the base plate 14 or a through hole provided on the elastic heat insulating member 28, as an example. In an embodiment, the heat-fusible parts may close the corresponding through holes, for example by means of glue bonding, and the heat-fusible parts may be formed of a phase change material, for example.

According to a second aspect of the embodiments of the present application, an electrical device is provided, where the electrical device may include a battery pack as described above, and also includes the above beneficial effects, which are not described herein again.

The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the present application, but rather, the present application is intended to cover any variations of the equivalent structures described herein or shown in the drawings, or the direct/indirect application of the present application to other related technical fields.

Claims (10)

1. A battery pack, the battery pack comprising:

the shell (10), the shell (10) comprises a cover plate (18), a frame body (20) and a bottom plate (14), the cover plate (18) and the bottom plate (14) are respectively connected to two opposite ends of the frame body (20), and the cover plate (18), the bottom plate (14) and the frame body (20) enclose to form an accommodating space (12);

a single battery (22) disposed in the accommodating space (12), wherein the battery pack has a first direction (Z), the single battery (22) has a top and a bottom disposed opposite to each other along the first direction (Z), the cover plate (18) is attached to the top, and the bottom plate (14) is attached to the bottom to fix the single battery (22);

an elastic heat insulating member (28), wherein the elastic heat insulating member (28) is arranged between the single battery (22) and the bottom plate (14), and the cover plate (18) and the bottom plate (14) compress the elastic heat insulating member (28) on the bottom;

the bottom is provided with an explosion-proof valve (24), a pressure release channel (34) is arranged in the bottom plate (14), a first pressure release part (16) communicated with the pressure release channel (34) is arranged at a position of the bottom plate (14) corresponding to the explosion-proof valve (24), a second pressure release part (30) is arranged on the elastic heat insulation part (28) corresponding to the explosion-proof valve (24), the projection of the explosion-proof valve (24) on the elastic heat insulation part (28) is positioned in the second pressure release part (30), and the projection of the second pressure release part (30) on the bottom plate (14) is positioned in the first pressure release part (16).

2. The battery pack according to claim 1, wherein the bottom plate (14) has a first connection portion, the first pressure release portion (16) is located in the first connection portion, the elastic heat insulating member (28) has a second connection portion, the second pressure release portion (30) is located in the second connection portion, the second connection portion corresponds to the first connection portion, the second connection portion is tightly attached to the bottom portion, and the first connection portion is tightly attached to the second connection portion.

3. The battery pack according to claim 2, further comprising a circlip provided at the second connection portion and surrounding the second pressure relief portion (30), one end of the circlip abutting the bottom portion in the first direction (Z) and the other end abutting the elastic heat insulating member (28).

4. The battery pack according to claim 2, wherein the first connection portion protrudes toward the bottom to form a first protruding portion, the second connection portion protrudes toward the bottom to form a second protruding portion, and a recess portion is formed at an end of the elastic heat insulating member (28) toward the bottom plate (14), the first protruding portion is inserted into the recess portion, and the second protruding portion is attached to the bottom.

5. The battery pack according to any one of claims 2-4, wherein the battery cell (22) is further provided with a post (26), the battery cell (22) further having a side portion located between the top portion and the bottom portion, the post (26) being located at the side portion; or alternatively

The pole (26) is located at the top, and the cover plate (18) is connected to the pole (26).

6. The battery pack according to claim 1, wherein a heat exchange cavity (32) is further arranged in the bottom plate (14), and the heat exchange cavities (32) are arranged at one side of the pressure release channel (34) at intervals.

7. The battery pack according to claim 6, wherein a buffer chamber is further provided in the bottom plate (14), and the buffer chamber is disposed at a bottom of the heat exchange chamber (32) at intervals in the first direction (Z).

8. The battery pack according to claim 2, further comprising an adhesive layer between the unit cell (22) and the elastic heat insulating member (28), and between the elastic heat insulating member (28) and the bottom plate (14), wherein the unit cell (22), the elastic heat insulating member (28), and the bottom plate (14) are fixed by the adhesive layer, and the adhesive layer evades the first connection portion and the second connection portion.

9. The battery pack according to claim 1, wherein the first pressure relief portion (16) and the second pressure relief portion (30) are at least one of an explosion-proof film, a through hole, a weak portion, or a hot-melt portion that can melt and form a channel at a set temperature.

10. An electrical device comprising the battery pack of any one of claims 1 to 9.