CN116742264A - Battery pack and electric equipment - Google Patents

Abstract

The application relates to a battery pack and electric equipment. The battery pack comprises a battery box body and a battery module, wherein the battery box body comprises a box body and an explosion-proof valve. The explosion-proof valve comprises an explosion-proof membrane structure and a shell, wherein the explosion-proof membrane structure is arranged on the outer surface of the box body and comprises an explosion-proof layer, a water absorption layer and a protection layer, and the explosion-proof layer covers the pressure relief hole in the box body. The casing sets up in the surface of box main part, and shroud rupture membrane structure. The explosion-proof layer and the protective layer are both breathable explosion-proof films, and the water absorbing layer is used for absorbing water vapor in gas flowing through.

Description

Battery pack and electric equipment

Technical Field

The application relates to the technical field of energy storage, in particular to a battery pack and electric equipment.

Background

An explosion-proof valve is arranged on a box body of the battery Pack (Pack), and mainly plays two roles, on one hand, the explosion-proof valve can realize the exchange balance of air pressure inside and outside the box body through a built-in explosion-proof film (polymer film) and simultaneously prevent water drops, dust, scraps and the like from entering the box body to generate risks; on the other hand, when thermal runaway occurs inside the case body to cause abrupt increase of the internal pressure, the explosion-proof film is preferentially broken in order to prevent explosion of the entire battery pack, thereby playing a role of pressure relief.

The explosion-proof membrane can play waterproof dirt-proof effect to through its self hole, realize inside and outside atmospheric pressure exchange, however, the unable vapor that prevents in the air completely enters into the battery package inside, and the vapor that gets into in the battery package can condense into the comdenstion water when meetting cooling system during operation, and the comdenstion water has the potential risk that leads to the inside short circuit of battery package.

Disclosure of Invention

Based on this, it is necessary to provide a battery pack and electric equipment for the problem that water vapor in the air can enter the inside of the battery pack through the rupture membrane of the explosion-proof valve.

The utility model provides a battery package, includes the battery box with set up in battery module in the battery box, the battery box includes box main part and explosion-proof valve, set up the pressure release hole in the box main part, the explosion-proof valve includes:

the explosion-proof membrane structure is arranged on the outer surface of the box body and comprises an explosion-proof layer, a water absorption layer and a protective layer which are sequentially stacked, and the explosion-proof layer covers the pressure relief hole; and

the shell is arranged on the outer surface of the box body, covers the explosion-proof membrane structure, and is provided with at least one ventilation hole communicated with the inside and the outside;

wherein, the explosion-proof layer and the protective layer are both breathable explosion-proof films, and the water absorbing layer is used for absorbing water vapor in the gas flowing through; the explosion-proof layer is provided with a thinning area, the thickness of the thinning area is T0, and the thickness of the explosion-proof layer is T1, wherein 2/3T1 is more than T0 and more than 1/3T1.

In one embodiment, the explosion-proof layer, the water-absorbing layer, and the protective layer are stacked with their edges aligned.

In one embodiment, the thickness of the water-absorbing layer is T2, wherein 6T1 > T2 > 2.5T1.

In one embodiment, the thickness of the protective layer is T3, where T1 > T3.

In one embodiment, the edge portion of the explosion-proof layer surrounds a part of the side surface of the water absorbing layer, the edge portion of the protective layer surrounds the other part of the side surface of the water absorbing layer, and the edge of the explosion-proof layer is connected with the edge of the protective layer to seal the water absorbing layer; the anti-explosion layer covers the side face of the water absorption layer, the edge of the anti-explosion layer is connected with the edge of the protection layer, and the water absorption layer is sealed; or the protective layer coats the side face of the water absorption layer, and the edge of the protective layer is connected with the edge of the explosion-proof layer to seal the water absorption layer.

In one embodiment, the thinned region has an inner edge and an outer edge, and the perimeter of the pressure relief aperture is located between the inner edge and the outer edge.

In one embodiment, the shell is cylindrical, the outer side surface of the shell is provided with a ring groove, and the plurality of ventilation holes are formed in the bottom of the ring groove.

In one embodiment, the explosion proof layer is adhered to the outer surface of the case body.

In one embodiment, the rupture disc structure is fabricated by lamination.

An electrical consumer comprising a load and a battery pack as in any one of the embodiments above, the load being electrically connected to the battery pack.

Drawings

Fig. 1 is a schematic view illustrating a structure of a battery pack according to an embodiment of the present application.

Fig. 2 is a schematic view illustrating a structure of the battery pack of fig. 1 at another view angle.

Fig. 3 is a schematic view of the structure of the panel bracket and the explosion-proof valve of the battery case of the battery pack of fig. 1.

Fig. 4 is a partial cross-sectional view of the structure shown in fig. 3.

Fig. 5 is a partial enlarged view of region a of the structure shown in fig. 4.

Fig. 6 is a bottom view of the rupture disc structure of the rupture valve of fig. 3.

Fig. 7 is a cross-sectional view of the rupture disc structure of fig. 6.

Fig. 8 is an exploded view of the rupture disc structure of fig. 6.

Fig. 9 is a bottom view of an explosion-proof membrane structure of an explosion-proof valve of a battery case of a battery pack according to another embodiment of the present application.

Fig. 10 is a cross-sectional view of the rupture disc structure of fig. 9.

Fig. 11 is an exploded view of the rupture disc structure of fig. 9.

Fig. 12 is an exploded view of an explosion proof membrane structure of an explosion proof valve of a battery case of a battery pack according to still another embodiment of the present application.

Fig. 13 is a block diagram of a powered device according to an embodiment of the application.

Reference numerals illustrate:

100-battery pack; 110-a battery box; 112-a box body; 113-a pressure relief vent; 114-cooling plates; 116-case cover; 118-panel bracket;

200-explosion-proof valve; 220-a housing; 222-ventilation holes; 224-ring groove; 230-a fastener;

300-rupture membrane structure; 310-explosion-proof layer; 311-thinning region; 312-grooves; 313-inboard edge; 314-outer edges; 315-a first lamination portion; 316—a first surround; 320-a water-absorbing layer; 330-a protective layer; 332-a second lamination portion; 334-a second surrounding portion; 336-ventilation holes;

400-electric equipment; 410-load.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1 to 3, fig. 1 shows a schematic structure of a battery pack according to an embodiment of the present application, fig. 2 shows a schematic structure of another view of the battery pack according to fig. 1, fig. 3 shows a schematic structure of a panel bracket and an explosion-proof valve of a battery case of the battery pack according to fig. 1, and an embodiment of the present application provides a battery pack 100 including a battery case 110 and a battery module (not shown), wherein the battery module is disposed in the battery case 110. The battery case 110 includes a case body 112 and an explosion-proof valve 200, and a pressure release hole 113 is formed in the case body 112. The explosion-proof valve 200 is disposed on the outer surface of the case body 112 and corresponds to the pressure relief hole 113, thereby balancing the air pressure inside and outside the case body 112 and relieving pressure and preventing explosion.

In this embodiment, the case body 112 includes a cooling plate 114, a case cover 116, and a panel bracket 118, and the case cover 116 is covered on the cooling plate 114 to form an inner space of the case body 112, in which the battery module is located. An opening (not shown) is provided on one side of the case cover 116, a panel bracket 118 is mounted on the inside of the case cover 116, and a part of the structure of the panel bracket 118 protrudes from the side of the case cover 116 through the opening. The pressure release hole 113 is formed on the panel bracket 118 and is communicated with the internal space of the battery case 110. The explosion-proof valve 200 is provided on the outer surface of the panel bracket 118. Further, connectors and various connectors (not numbered) are also mounted to the outer surface of the panel bracket 118. It should be noted that, in other embodiments, the case body 112 may include a case base and a cover plate, where the cover plate covers the case base to form an internal space of the case body 112, the liquid cooling plate is disposed in the case base, and the battery module is disposed in the case base and is located on the liquid cooling plate, where the explosion-proof valve 200 may be disposed on a side surface of the case base or on the cover plate.

Referring to fig. 4 and 5, in conjunction with fig. 3, fig. 4 shows a partial cross-sectional view of a panel bracket and an explosion-proof valve of a battery case of the battery pack according to the present embodiment, fig. 5 shows a partial enlarged view of a region a of the structure shown in fig. 4, and the explosion-proof valve 200 includes a case 220 and an explosion-proof membrane structure 300, wherein the explosion-proof membrane structure 300 is disposed on an outer surface of the panel bracket 118 and covers the pressure relief hole 113. The casing 220 is disposed on the panel bracket 118, and covers the rupture disk structure 300, and at least one ventilation hole 222 is formed in the casing 220, and the ventilation hole 222 is used for exchanging with external air.

Further, the rupture structure 300 may be fixedly connected to the surface of the panel bracket 118 by glue coated on the panel bracket 118, so as to fix the rupture structure 300 on the panel bracket 118 and cover the pressure release hole 113, and a connection area is formed at the connection position of the rupture structure 300 and the panel bracket 118. It will be appreciated that in other embodiments, where the glue has sufficient adhesion, the rupture disc structure 300 may be applied first and then the rupture disc structure 300 may be adhered to the surface of the panel bracket 118 to cover the pressure relief vent 113.

In this embodiment, the panel support 118 is a plate body, the housing 220 and the rupture disc structure 300 are both disposed thereon, and the panel support 118 is substantially larger than the housing 220. The panel bracket 118, which is a part of the structure of the case body 112, encloses the cooling plate 114 and the case cover 116 together to form an inner space of the case body 112, and the inner space of the case body 112 communicates with the outside through the explosion-proof valve 200. It should be noted that, in other embodiments, the explosion-proof valve 200 may include a valve body and an explosion-proof membrane structure 300 disposed in the valve body, where the valve body may be fixed on the case body 112 through a sealing ring, so as to be capable of communicating with the internal space of the case body 112 and the external environment.

In this embodiment, the casing 220 is cylindrical, the outer side surface of the casing is provided with the annular groove 224, the plurality of ventilation holes 222 are formed at the bottom of the annular groove 224, and the annular groove 224 can reduce the blocking probability of the ventilation holes 222, wherein the diameter of the ventilation holes 222 is less than or equal to 0.8mm.

In this embodiment, the housing 220 is fixed to the panel bracket 118 of the case body 112 by a plurality of fasteners 230, and the fasteners 230 penetrate the panel bracket 118 of the case body 112 and are inserted into the end surface of the housing 220 to achieve a fixed connection. The fastener 230 penetrates the panel bracket 118 from inside to outside and then is inserted into the housing 220, so that the structure of the housing 220 is simplified and the fixing effect is good compared with the fixing mode from outside to inside. The fastener 230 may be, but not limited to, a screw, a pin, etc.

Referring to fig. 6 to 8, fig. 6 shows a bottom view of an explosion-proof membrane structure of an explosion-proof valve of a battery case of a battery pack in the present embodiment, fig. 7 shows a cross-sectional view of the explosion-proof membrane structure of fig. 6, and fig. 8 shows an exploded view of the explosion-proof membrane structure of fig. 6, the explosion-proof membrane structure 300 includes an explosion-proof layer 310, a water absorbing layer 320, and a protective layer 330, which are sequentially stacked. Wherein, the explosion-proof layer 310 is disposed on the outer surface of the panel support 118 and covers the pressure relief hole 113, the explosion-proof layer 310 and the protection layer 330 are both breathable explosion-proof films, and the water absorbing layer 320 is used for absorbing water vapor in the gas flowing through. The explosion-proof layer 310 is provided with a thinned region 311, the thickness of the thinned region 311 is T0, and the thickness of the explosion-proof layer 310 is T1, wherein 2/3T1 is more than T0 is more than 1/3T1.

By arranging the water-absorbing layer 320 between the explosion-proof layer 310 and the protective layer 330, the explosion-proof layer 310 and the protective layer 330 are both breathable explosion-proof films, the water-absorbing layer 320 can absorb water vapor in the gas flowing through, the explosion-proof layer 310 can play a role in pressure relief and explosion prevention, when external gas enters the inside of the box body of the battery pack through the explosion-proof film structure 300, the middle water-absorbing layer 320 can absorb water vapor in the external gas, so that the water vapor in the air is absorbed between the explosion-proof layer 310 and the protective layer 330, the effect of filtering the water vapor and drying the gas is achieved, the water vapor can be reduced or even prevented from entering the box body, and the risk of short circuit inside the battery pack caused by condensation of the water vapor in the box body is further reduced; the protection layer 330 cooperates with the explosion-proof layer 310 to clamp and fix the water-absorbing layer 320, and can protect the water-absorbing layer 320, reduce contact with excessive dust or water drops in the external environment, reduce influence of the outside on the moisture absorption effect of the water-absorbing layer 320, and prolong the service life of the water-absorbing layer 320. In addition, the protective layer 330 has good air permeability and waterproof performance, and can play a role in preventing water and dust, further reduce the influence of the external environment on the water absorption layer 320, and improve the protective effect of the protective layer 330.

Further, by controlling the thickness of the thinned region 311 of the explosion-proof layer 310, the thickness T0 of the thinned region 311 is greater than one third of the thickness T1 of the explosion-proof layer 310 and less than two thirds of the thickness T1 of the explosion-proof layer 310, when the explosion-proof layer 310 is exploded, the explosion can be preferentially started from the thinned region 311, and the influence of the arrangement of the water-absorbing layer 320 and the protective layer 330 on the timely pressure relief function of the explosion-proof layer 310 is reduced or avoided.

It should be noted that, when the explosion-proof membrane structure 300 is applied, it may be assembled in the valve body of the explosion-proof valve, and the valve body is assembled in the box body of the battery pack, so as to realize the functions of pressure relief, explosion prevention and water vapor absorption; or, the rupture membrane structure 300 can be directly adhered to the box body of the battery pack, so that the rupture layer 310 covers the pressure release hole formed in the box body, and the outer surface of the box body is provided with a shell structure for protecting the rupture membrane structure 300, so that the rupture membrane structure 300 can play roles of pressure release, explosion prevention and water vapor absorption.

In this embodiment, the edges of the explosion-proof layer 310, the water-absorbing layer 320 and the protective layer 330 are aligned and laminated, and the water-absorbing layer 320 is completely attached to the explosion-proof layer 310, so that the water-absorbing layer 320 can completely cover the pressure release hole 113, and the tightness of the vapor-proof effect is improved; the protective layer 330 is also completely attached to the water-absorbing layer 320, so that the influence of the external environment on the water-absorbing layer 320 can be reduced better; moreover, rupture disc structure 300 is capable of achieving material uniformity at the junction with panel support 118, reducing or avoiding the risk of stress concentrations leading to premature rupture of rupture disc 310. It will be appreciated that in other embodiments, the edges between the different layers may not overlap in alignment, e.g., the different layers may have different shapes such that the edges are staggered, the edges of the intermediate layer extend completely beyond the edges of the other layers, or the edges of the other layers extend completely beyond the edges of the intermediate layer.

Further, the rupture disc structure 300 is circular in shape and is disposed corresponding to the circular pressure relief hole 113. In other words, the explosion-proof layer 310, the water-absorbing layer 320 and the protection layer 330 are all circular, and have the same diameter and slightly larger than the diameter of the pressure relief hole 113, so as to completely cover the pressure relief hole 113. It should be noted that, the rupture disk structure 300 is not limited to a circular shape, and its shape depends on the shape of the pressure relief hole 113, and in other embodiments, the rupture disk structure 300 may be square, oval, or other polygonal shape.

It should be noted that, the explosion-proof layer 310 may be fixedly connected to the outer surface of the panel support 118 by glue coated on the panel support 118, so as to cover the pressure relief hole 113, and the connection between the explosion-proof layer 310 and the panel support 118 forms a connection area. Referring to fig. 5, the thinned region 311 is formed by providing a recess 312 in the surface of the explosion-proof layer 310. The thinning area 311 has an inner edge 313 and an outer edge 314, where the inner edge 313 may be disposed corresponding to the periphery of the pressure relief hole 113, or the periphery of the pressure relief hole 113 is located between the inner edge 313 and the outer edge 314 of the thinning area 311, i.e. a portion of the groove 312 is opened in the connection area and a portion of the groove 312 is opened in an area directly corresponding to the pressure relief hole 113, so that direct communication between the groove 312 and the pressure relief hole 113 can be achieved, and high-pressure gas directly enters the groove 312 through the pressure relief hole 113 during blasting, so that peripheral blasting is started from the thinning area 311, thereby being beneficial to improving the blasting effect. Obviously, at least part of the thinned region 311 is formed in the connection region, in this embodiment, the groove 312 is annular, and the thinned region 311 is an annular region below the surface.

In this embodiment, the thickness T0 of the thinned region 311 may be equal to half the thickness T1 of the explosion-proof layer 310, that is, the depth of the groove 312 is equal to half the thickness T1 of the explosion-proof layer 310, so as to ensure the timely pressure relief function of the explosion-proof membrane. Obviously, in other embodiments, T0 may be equal to 0.35T1, 0.4T1, 0.45T1, 0.55T1, 0.6T1 or 0.65T1.

In this embodiment, the explosion-proof layer 310 is an explosion-proof membrane made of polymer, i.e. a waterproof and breathable membrane, and the material of the explosion-proof membrane may be, but is not limited to, polytetrafluoroethylene membrane.

In order to prolong the service life of the water-absorbing layer 320 and improve the moisture absorption effect of the water-absorbing layer 320, the thickness of the water-absorbing layer 320 is T2, wherein T2 > T1, so as to avoid the failure of the water-absorbing layer 320 due to saturation of moisture absorption in a short time. Further, 6T1 > T2 > 2.5T1, thereby greatly improving the capacity of the water absorbing layer 320 for absorbing water vapor, further improving the service life of the water absorbing layer 320, and substantially controlling the water vapor to be absorbed by the water absorbing layer 320 even when the air humidity is high, so as to prevent the water vapor from entering the inside of the case.

In this embodiment, the thickness T2 of the water-absorbing layer 320 is equal to 3.5T1, which gives consideration to the service time, the moisture absorption capability and the timely pressure release performance of the rupture disk. Obviously, in other embodiments, the thickness T2 of the water-absorbing layer 320 may be equal to 3T1, 4T1, 4.5T1, 5T1 or 5.5T1.

In this embodiment, the material of the water-absorbing layer 320 may be, but is not limited to, porous graphene material or other porous polymer material with high water absorption, which has good air permeability and hydrophilicity.

In this embodiment, the thickness of the protection layer 330 is T3, where T1 > T3. When the explosion-proof layer 310 is broken by the larger air pressure, the strength of the protection layer 330 is not as good as that of the explosion-proof layer 310 due to the smaller thickness of the protection layer 330, and the protection layer 330 can be broken smoothly by the air pressure, so that the risk of untimely pressure relief is reduced or avoided. If the thickness of the explosion-proof layer 310 is less than or equal to the thickness of the protection layer 330, an untimely risk of pressure release may occur with respect to the original single-layer explosion-proof film, because after a part of the air pressure is used to break the explosion-proof layer 310, the remaining air pressure may not be able to break the protection layer 330 in time, and thus, it is necessary to ensure that T1 > T3. Wherein T3 may be specifically equal to 0.95T1, 0.9T1, 0.8T1 or less.

In this embodiment, the protection layer 330 is an explosion-proof film made of polymer, i.e. a waterproof and breathable film, and the material thereof may be, but is not limited to, polytetrafluoroethylene film.

In this embodiment, the rupture disc structure 300 is manufactured by lamination, that is, after the rupture disc 310, the water absorbing layer 320 and the protective layer 330 are stacked, the three-layer structure is pressed by lamination equipment, so that the layers are fixedly connected to each other, and then an integral structure is formed.

Referring to fig. 9 to 11, fig. 9 is a bottom view showing the rupture membrane structure of the rupture valve of the battery case of the battery pack according to another embodiment of the present application, fig. 10 is a cross-sectional view showing the rupture membrane structure of fig. 9, and fig. 11 is an exploded view showing the rupture membrane structure of fig. 9. In comparison with the arrangement in which the different layers of the rupture membrane structure 300 of the battery pack 100 are stacked in an edge-aligned manner, the edge portion of the rupture layer 310 of the rupture membrane structure 300 of the battery pack 100 is disposed around a portion of the side surface of the water-absorbing layer 320, the edge portion of the protective layer 330 is disposed around the remaining portion of the side surface of the water-absorbing layer 320, and the edge of the rupture layer 310 is connected with the edge of the protective layer 330, thereby closing the water-absorbing layer 320. When the rupture membrane structure 300 is prepared, the water absorbing layer 320 can be arranged between the rupture layer 310 and the protective layer 330 only by sealing and connecting the edge of the rupture layer 310 with the edge of the protective layer 330, so that the lamination process is simplified, the side surface of the water absorbing layer 320 is coated, and the protection effect of the water absorbing layer 320 is further improved. Moreover, the edges of the explosion-proof layer 310 and the edges of the protective layer 330 are corresponding, and the water-absorbing layer 320 is not provided with corresponding parts, i.e. most of the water-absorbing layer 320 is arranged corresponding to the central areas of the explosion-proof layer 310 and the protective layer 330, so that the whole thickness of the explosion-proof membrane structure 300 is thinner at the edges, and the pressure relief and explosion are more facilitated.

It should be noted that, in other embodiments, the explosion-proof layer 310 completely covers the side surface of the water-absorbing layer 320 or the protective layer 330 completely covers the side surface of the water-absorbing layer 320, and the edge of the explosion-proof layer 310 is in sealing connection with the edge of the protective layer 330, so as to seal the water-absorbing layer 320.

Further, the explosion-proof layer 310 includes a first lamination portion 315 and a first surrounding portion 316, and the first surrounding portion 316 is formed to protrude from an edge of the first lamination portion 315 toward the water-absorbing layer 320. The protective layer 330 includes a second lamination portion 332 and a second surrounding portion 334, the second surrounding portion 334 being formed to protrude from an edge of the second lamination portion 332 toward the water-absorbing layer 320. The end surfaces of the first surrounding portion 316 and the second surrounding portion 334 are connected in a sealed manner. When the rupture disc structure 300 is manufactured, only the end surfaces of the first surrounding part 316 and the second surrounding part 334 are connected by a hot pressing technology, and the integral lamination is not required, so that the lamination process is more simply and efficiently completed, and the connection is firmer.

As for other aspects of the battery pack 100 in this embodiment, the same as those of the battery pack 100 in the above embodiment, and the detailed description thereof will be omitted herein.

Referring to fig. 12, fig. 12 is an exploded view showing an explosion-proof membrane structure of an explosion-proof valve of a battery case of a battery pack according to another embodiment of the application, in which the protective layer 330 of the explosion-proof membrane structure 300 of the battery pack 100 is a top patch of a battery, rather than an explosion-proof membrane, and a plurality of ventilation holes 336 are formed in the top patch, and the ventilation holes 336 allow air to flow therethrough, so that air flow exchange is realized, and the top patch has a certain structural strength, so that the overall structural strength of the explosion-proof membrane structure can be increased. To reduce the influence of the external environment on the water-absorbing layer 320, the more the number of the ventilation holes 336, the smaller the pore size, the better.

In this embodiment, the top patch may be made of, but not limited to, polycarbonate (PC). Moreover, the patch is the same diameter as the water absorbing layer 320, and the edges are aligned.

As for other aspects of the battery pack 100 in this embodiment, the same as those of the battery pack 100 in the above embodiment, and the detailed description thereof will be omitted herein.

Referring to fig. 13, with reference to fig. 1 and fig. 2, fig. 13 is a block diagram illustrating a power consumption device according to an embodiment of the application, and a power consumption device 400 provided by an embodiment of the application includes a load 410 and a battery pack 100, where the load 410 is electrically connected with the battery pack 100. The specific structure of the battery pack 100 refers to the above embodiment, and since the electric device 400 of this embodiment adopts all the technical solutions of all the embodiments, the battery pack also has all the beneficial effects brought by the technical solutions of the embodiments, which are not described in detail herein. Wherein the battery pack 100 provides power to the load 410.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. The utility model provides a battery package (100), includes battery box (110) and set up in battery module in battery box (110), its characterized in that, battery box (110) include box main part (112) and explosion-proof valve (200), offer pressure release hole (113) on box main part (112), explosion-proof valve (200) include:

the explosion-proof membrane structure (300), the explosion-proof membrane structure (300) is arranged on the outer surface of the box body (112), the explosion-proof membrane structure (300) comprises an explosion-proof layer (310), a water absorption layer (320) and a protection layer (330) which are sequentially stacked, and the explosion-proof layer (310) covers the pressure relief hole (113); and

the shell (220) is arranged on the outer surface of the box body (112), and covers the explosion-proof membrane structure (300), and at least one ventilation hole (222) communicated with the inside and the outside is formed in the shell (220);

wherein the explosion-proof layer (310) and the protective layer (330) are both breathable explosion-proof films, and the water absorbing layer (320) is used for absorbing water vapor in the gas flowing through; the explosion-proof layer (310) is provided with a thinning region (311), the thickness of the thinning region (311) is T0, and the thickness of the explosion-proof layer (310) is T1, wherein 2/3T1 is more than T0 and more than 1/3T1.

2. The battery pack (100) of claim 1, wherein the explosion-proof layer (310), the water absorbing layer (320), and the protective layer (330) are stacked in edge alignment.

3. The battery pack (100) of claim 1, wherein the water absorbing layer (320) has a thickness T2, wherein 6T1 > T2 > 2.5T1.

4. The battery pack (100) of claim 1, wherein the protective layer (330) has a thickness T3, wherein T1 > T3.

5. The battery pack (100) according to any one of claims 1 to 4, wherein,

the edge part of the explosion-proof layer (310) surrounds part of the side surface of the water absorbing layer (320), the edge part of the protective layer (330) surrounds the other part of the side surface of the water absorbing layer (320), and the edge of the explosion-proof layer (310) is connected with the edge of the protective layer (330) to seal the water absorbing layer (320);

the explosion-proof layer (310) coats the side surface of the water absorption layer (320), and the edge of the explosion-proof layer (310) is connected with the edge of the protection layer (330) to seal the water absorption layer (320); or alternatively

The protective layer (330) covers the side surface of the water absorbing layer (320), and the edge of the protective layer (330) is connected with the edge of the explosion-proof layer (310) to seal the water absorbing layer (320).

6. The battery pack (100) according to any one of claims 1 to 4, wherein the thinned region (311) has an inner edge (313) and an outer edge (314), the periphery of the pressure relief hole (113) being located between the inner edge (313) and the outer edge (314).

7. The battery pack (100) according to any one of claims 1 to 4, wherein the housing (220) is cylindrical, a ring groove (224) is formed in an outer side surface of the housing (220), and the plurality of ventilation holes (222) are formed in a bottom of the ring groove (224).

8. The battery pack (100) of any one of claims 1 to 4, wherein the explosion-proof layer (310) is bonded to an outer surface of the case body (112).

9. The battery pack (100) according to any one of claims 1 to 4, wherein the rupture membrane structure (300) is manufactured by lamination.

10. A powered device (400) comprising a load (410) and a battery pack (100), the load (410) being electrically connected to the battery pack (100), characterized in that the battery pack (100) is a battery pack (100) according to any one of claims 1 to 9.