Energy storage device

Abstract

The utility model relates to the technical field of energy storage, and particularly discloses energy storage equipment. The energy storage equipment comprises a battery pack, a first shell, an anti-explosion valve and a second shell, wherein the battery pack comprises a battery cell; the first shell is provided with a closed cavity, and the closed cavity is used for accommodating a battery pack; a pressure relief hole is formed in the first shell and is communicated with the closed cavity; the anti-explosion valve is arranged on the first shell; and the explosion-proof valve is configured to block the pressure relief hole and can open the pressure relief hole under the pressure generated when the battery cell sprays the valve. A pressure relief space is formed between the second shell and the side, provided with the pressure relief hole, of the first shell, and the pressure relief space is configured to be communicated with the closed cavity through the pressure relief hole when the pressure relief hole is opened; the second shell is provided with a first exhaust port and a second exhaust port which are oppositely arranged, the first exhaust port and the second exhaust port are located on the two opposite sides of the anti-explosion valve, and airflow in the pressure relief space is exhausted out of the energy storage equipment through the first exhaust port and the second exhaust port. According to the energy storage equipment, pressure relief of the battery cell under the thermal runaway condition can be facilitated, and the waterproofness of the energy storage equipment can also be improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage device. Background Art

[0002] Portable mobile energy storage devices are increasingly used in people's outdoor camping, leisure, work and home emergency power backup scenarios. In order to reduce the explosion of battery cells during thermal runaway, energy storage devices are usually equipped with exposed exhaust channels. However, in rainy days and other scenarios, energy storage devices are prone to water ingress from the exhaust channels. After water enters the energy storage device, it may cause the battery cells in its internal battery pack to short-circuit, thereby causing safety problems such as equipment leakage. Therefore, in the related art, energy storage devices have the problem that pressure relief and exhaust and waterproof performance cannot be taken into account at the same time when the battery cells are thermally runaway. Utility Model Content

[0003] In view of this, the present application provides an energy storage device, which can improve the waterproofness of the energy storage device while facilitating pressure relief when the battery cell has thermal runaway.

[0004] An embodiment of the present application provides an energy storage device, including a battery pack, a first shell, an explosion-proof valve and a second shell, wherein the battery pack includes a battery cell. The first shell has a closed cavity, which is used to accommodate the battery pack; the first shell is provided with a pressure relief hole, which is connected to the closed cavity; the explosion-proof valve is provided in the first shell; the explosion-proof valve is configured to block the pressure relief hole and can open the pressure relief hole under the pressure generated when the battery cell sprays the valve. A pressure relief space is formed between the second shell and a side of the first shell having the pressure relief hole, and the pressure relief space is configured to connect to the closed cavity through the pressure relief hole when the pressure relief hole is opened; the second shell has a first exhaust port and a second exhaust port which are arranged opposite to each other, and the first exhaust port and the second exhaust port are located on opposite sides of the explosion-proof valve, and the airflow in the pressure relief space is discharged to the outside of the energy storage device.

[0005] In the above energy storage device, on the one hand, the first shell and the explosion-proof valve can isolate the battery pack from the external environment, so that external water vapor is not easy to enter the battery pack, thereby improving the waterproofness of the energy storage device, and the heat generated by the battery pack during operation can also be discharged to the outside of the closed cavity through the explosion-proof valve, which is beneficial to the heat dissipation of the battery pack; on the other hand, when the battery cell of the battery pack is sprayed, the pressure of the closed cavity can be quickly increased. Under this pressure, the explosion-proof valve can be broken or opened to open the pressure relief hole, and then the airflow in the closed cavity can enter the pressure relief space through the pressure relief hole. The airflow entering the pressure relief space can flow in opposite directions to the first exhaust port and the second exhaust port, and a part of it is discharged from the first exhaust port to the outside of the energy storage device, and a part of it is discharged from the second exhaust port to the outside of the energy storage device, so as to reduce the pressure in the closed cavity and achieve the purpose of pressure relief of the battery cell. The above energy storage device can not only facilitate the pressure relief of the battery cell in the case of thermal runaway, but also improve the waterproofness of the energy storage device.

[0006] In at least one embodiment, the direction of the pressure relief hole toward the second shell is defined as a first direction, the first exhaust port and the second exhaust port are arranged opposite to each other in the second direction, the first exhaust port includes a plurality of first through holes, and the first direction is perpendicular to the second direction.

[0007] In the above-mentioned embodiment, after the airflow is discharged from the pressure relief hole to the pressure relief space, part of the airflow flowing toward the first exhaust port can be discharged to the outside of the energy storage device through the multiple first through holes. Discharging the airflow through the multiple first through holes is conducive to the airflow flowing toward the first exhaust port to quickly discharge the pressure relief space.

[0008] In at least one embodiment, the plurality of first through holes are sequentially arranged along a third direction, the second exhaust port includes a plurality of second through holes, the plurality of second through holes are sequentially arranged along a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0009] In the above energy storage device, part of the airflow flowing toward the second exhaust port can be discharged to the outside of the energy storage device through the plurality of second through holes. The provision of the plurality of second through holes is conducive to the airflow flowing toward the second exhaust port to be quickly discharged from the pressure relief space. The plurality of first through holes and the plurality of second through holes are arranged in sequence along the third direction, which is conducive to further dispersing the airflow and facilitating rapid pressure relief of the pressure relief space.

[0010] In at least one embodiment, the explosion-proof valve includes a brittle waterproof breathable membrane, which is configured to be breathable and waterproof; the direction of the pressure relief hole toward the second shell is defined as a first direction, and the brittle waterproof breathable membrane is configured to be breathable along the first direction.

[0011] In the above-mentioned embodiment, the brittle waterproof breathable membrane can prevent water from entering the closed cavity, making the battery pack less likely to come into contact with water vapor and less susceptible to moisture, thereby making the battery pack less likely to be damaged and improving the safety of the energy storage device. The brittle waterproof breathable membrane is also breathable, so that when the battery pack is working, the hot air flow generated by the battery cell can pass through the brittle waterproof breathable membrane into the pressure relief space and then be discharged out of the energy storage device to facilitate heat dissipation of the energy storage device. The brittle texture of the brittle waterproof breathable membrane is conducive to breaking through the brittle waterproof breathable membrane when the battery cell spray valve is opened, making it easier to quickly open the pressure relief hole.

[0012] In at least one embodiment, the first shell includes an outer shell portion, an enclosure portion and a sealing plate, the enclosure portion and the sealing plate are arranged in the outer shell portion, the enclosure portion, the sealing plate and part of the outer shell portion are enclosed to form a closed cavity, the enclosure portion is provided with a pressure relief hole, and the second shell is connected to the outer shell portion and is arranged on a side of the enclosure portion where the pressure relief hole is provided.

[0013] In the above-mentioned embodiment, the outer shell can further isolate the closed cavity from the external environment, so that external water vapor is not easy to enter the closed cavity, and the structural strength of the first shell is improved.

[0014] In at least one embodiment, an exhaust space is formed between the outer shell portion and the enclosure portion, and the exhaust space is communicated with the pressure relief space.

[0015] In the above embodiments, part of the airflow entering the pressure relief space can enter the exhaust space, and the exhaust space helps to disperse the airflow pressure in the pressure relief space, so that the pressure relief space and the closed cavity are not prone to explosion due to excessive air pressure.

[0016] In at least one embodiment, the outer shell is provided with an exhaust port, and the exhaust port is communicated with the exhaust space.

[0017] In the above embodiment, the airflow in the pressure relief space can enter the airflow in the exhaust space and be discharged to the outside of the energy storage device through the exhaust port. The provision of the exhaust port increases the exhaust path of the gas in the pressure relief space, which is more conducive to the rapid pressure relief of the energy storage device.

[0018] In at least one embodiment, the outer shell has a receiving cavity, and a sealing plate separates the receiving cavity and the closed cavity; the energy storage device also includes an inverter module, which is electrically connected to the battery pack, and the inverter module is located in the receiving cavity and is arranged on the sealing plate, and the sealing plate supports the inverter module.

[0019] In the above-mentioned embodiment, the setting of the inverter module enables the energy storage device to directly supply the electrical device. The sealing plate can separate the inverter module from the battery pack, so that the airflow generated when the battery cell spray valve is not easy to escape directly into the receiving cavity, reducing the influence of the battery cell spray valve on the inverter module.

[0020] In at least one embodiment, the outer shell includes an air inlet and an air outlet that are relatively arranged, and the inverter module is located between the air inlet and the air outlet; the air inlet and the air outlet are respectively connected to the receiving cavity, and the receiving cavity is connected to the pressure relief space.

[0021] In the above embodiment, the air inlet allows external air to enter the receiving cavity, and the air outlet facilitates the air in the receiving cavity to be discharged to dissipate heat from the inverter module. The air in the pressure relief space can also be discharged through the air inlet and the air outlet, which is conducive to increasing the pressure relief speed.

[0022] In at least one embodiment, the energy storage device further includes a fan, which is disposed in the receiving chamber and configured to introduce external airflow from an air inlet.

[0023] In the above-mentioned embodiment, the fan can introduce external airflow into the receiving cavity, which is beneficial to the airflow in the receiving cavity, thereby improving the heat dissipation effect on the inverter module.

[0024] In at least one embodiment, the first shell includes a first buckling portion, and the second shell includes a second buckling portion, and the first buckling portion is detachably connected to the second buckling portion.

[0025] In the above-mentioned embodiment, the detachable connection between the first buckling portion and the second buckling portion can realize the detachable connection between the first shell and the second shell, thereby facilitating the assembly and disassembly of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope.

[0027] Figure 1 A three-dimensional diagram of an energy storage device provided in one embodiment of the present application.

[0028] Figure 2 for Figure 1 Exploded view of the energy storage device.

[0029] Figure 3 It is a three-dimensional view of the second shell at an angle in one embodiment of the present application.

[0030] Figure 4 for Figure 1 Cross-sectional view of the energy storage device.

[0031] Figure 5 This is an exploded view of the first shell and the battery pack in one embodiment of the present application.

[0032] Figure 6 It is a three-dimensional diagram of the first shell in one embodiment of the present application.

[0033] Figure 7 It is a three-dimensional diagram of the bottom shell in one embodiment of the present application.

[0034] Figure 8 It is a three-dimensional view of the second shell at another angle in one embodiment of the present application.

[0035] Fig. 9 for Figure 7 Enlarged view of part IX.

[0036] Main component symbols

[0037] 1000-energy storage device 100-first shell 10-enclosed cavity

[0038] 20-pressure relief hole 30-pressure relief space 40-shell

[0039] 41-cover 411-air outlet 412-air inlet

[0040] 42- bottom shell 50- enclosure 51- side wall

[0041] 60-sealing plate 70-exhaust space 80-accommodation chamber

[0042] 90-first buckling portion 91-slot 200-second housing

[0043] 201-first exhaust port 2011-first through hole 202-second exhaust port

[0044] 2021- second through hole 203- second buckling portion 300- battery pack

[0045] 301-battery cell 400-inverter module 500-external interface

[0046] 600-explosion-proof valve601-brittle waterproof breathable membrane602-bracket

[0047] 700-Fan X-First direction Y-Second direction

[0048] Z-third direction DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0051] Portable mobile energy storage devices are increasingly used in people's outdoor camping, leisure, work and home emergency power backup scenarios. In order to reduce the explosion of battery cells during thermal runaway, energy storage devices are usually equipped with exposed exhaust channels. However, in rainy days and other scenarios, energy storage devices are prone to water ingress from the exhaust channels. After water enters the energy storage device, it may cause the battery cells in its internal battery pack to short-circuit, thereby causing safety problems such as equipment leakage. Therefore, in the related art, energy storage devices have the problem that pressure relief and exhaust and waterproof performance cannot be taken into account at the same time when the battery cells are thermally runaway.

[0052] An embodiment of the present application provides an energy storage device, including a battery pack, a first shell, a waterproof breathable membrane and a second shell, wherein the battery pack includes a battery cell. The shell has a closed cavity, which is used to accommodate the battery pack; the first shell is provided with a pressure relief hole, which is connected to the closed cavity; the explosion-proof valve is provided in the first shell; the explosion-proof valve is configured to block the pressure relief hole and can open the pressure relief hole under the pressure generated when the battery cell sprays the valve. A pressure relief space is formed between the second shell and the side of the first shell having the pressure relief hole, and the pressure relief space is configured to connect to the closed cavity through the pressure relief hole when the pressure relief hole is opened; the second shell has a first exhaust port and a second exhaust port arranged opposite to each other, and the first exhaust port and the second exhaust port are located on opposite sides of the explosion-proof valve, and the airflow in the pressure relief space is discharged to the outside of the energy storage device.

[0053] In the above energy storage device, on the one hand, the first shell and the explosion-proof valve can isolate the battery pack from the external environment, so that external water vapor is not easy to enter the battery pack, thereby improving the waterproofness of the energy storage device, and the heat generated by the battery pack during operation can also be discharged to the outside of the closed cavity through the explosion-proof valve, which is beneficial to the heat dissipation of the battery pack; on the other hand, when the battery cell of the battery pack is sprayed, the pressure of the closed cavity can be quickly increased. Under this pressure, the explosion-proof valve can be broken or opened to open the pressure relief hole, and then the airflow in the closed cavity can enter the pressure relief space through the pressure relief hole. The airflow entering the pressure relief space can flow in opposite directions to the first exhaust port and the second exhaust port, and a part of it is discharged from the first exhaust port to the outside of the energy storage device, and a part of it is discharged from the second exhaust port to the outside of the energy storage device, so as to reduce the pressure in the closed cavity and achieve the purpose of pressure relief of the battery cell. The above energy storage device can not only facilitate the pressure relief of the battery cell in the case of thermal runaway, but also improve the waterproofness of the energy storage device.

[0054] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0055] See also Figures 1 to 4 An embodiment of the present application provides an energy storage device 1000, which includes a first shell 100, a second shell 200 and a battery pack 300. The first shell 100 has a closed cavity 10, which is used to accommodate the battery pack 300. The battery pack 300 includes a plurality of battery cells 301, and the battery cells 301 have safety valves (not shown) to discharge the gas generated by the battery cells 301 when the battery cells 301 work abnormally. The energy storage device 1000 can be a household or industrial and commercial energy storage power source, or a portable mobile power source, etc.

[0056] See also Figure 2 and Figure 4In some embodiments, the energy storage device 1000 further includes an inverter module 400, which is electrically connected to the battery pack 300 and is located in the first housing 100. The energy storage device 1000 can be used in conjunction with a backup power supply. The energy storage device 1000 has an external interface 500, and the charging cable of the backup power supply is connected to the energy storage device 1000 through the external interface 500 of the energy storage device 1000, so that the backup power supply can charge the energy storage device 1000.

[0057] See also Figures 2 to 6 In some embodiments, the energy storage device 1000 further includes an explosion-proof valve 600, which is disposed on the first shell 100. The first shell 100 is provided with a pressure relief hole 20, which is connected to the closed cavity 10. The explosion-proof valve 600 is configured to block the pressure relief hole 20 and can open the pressure relief hole 20 under the pressure generated when the battery cell 301 sprays the valve. A pressure relief space 30 is formed between the second shell 200 and the side of the first shell 100 having the pressure relief hole 20, and the pressure relief space 30 is configured to be connected to the closed cavity 10 through the pressure relief hole 20 when the pressure relief hole 20 is opened; the second shell 200 has a first exhaust port 201 and a second exhaust port 202 arranged opposite to each other, and the first exhaust port 201 and the second exhaust port 202 are located on opposite sides of the explosion-proof valve 600, and the airflow in the pressure relief space 30 is discharged to the outside of the energy storage device 1000.

[0058] On the one hand, the first shell 100 and the explosion-proof valve 600 can isolate the battery pack 300 from the external environment, so that external water vapor is not easy to enter the battery pack 300, thereby improving the waterproofness of the energy storage device 1000, and the heat generated by the battery pack 300 during operation can also be discharged to the outside of the closed cavity 10 through the explosion-proof valve 600, which is beneficial to the heat dissipation of the battery pack 300; on the other hand, when the battery cell 301 of the battery pack 300 is sprayed, the pressure of the closed cavity 10 can be quickly increased. Under this pressure, the explosion-proof valve 600 can be broken or opened to open the pressure relief hole 20, and then the airflow in the closed cavity 10 can enter the pressure relief space 30 through the pressure relief hole 20. The airflow entering the pressure relief space 30 can flow in opposite directions to the first exhaust port 201 and the second exhaust port 202, and a part of it is discharged from the first exhaust port 201 to the outside of the energy storage device 1000, and a part of it is discharged from the second exhaust port 202 to the outside of the energy storage device 1000, so as to reduce the pressure in the closed cavity 10 and achieve the purpose of pressure relief of the battery cell 301. The above energy storage device 1000 can not only facilitate the pressure relief of the battery cell 301 in the event of thermal runaway, but also improve the waterproofness of the energy storage device 1000 .

[0059] See also Figures 4 to 6In some embodiments, the first housing 100 includes a housing portion 40, a baffle portion 50 and a sealing plate 60, the baffle portion 50 and the sealing plate 60 are disposed in the housing portion 40, the baffle portion 50, the sealing plate 60 and part of the housing portion 40 enclose a closed cavity 10, the baffle portion 50 is provided with a pressure relief hole 20, and the second housing 200 is connected to the housing portion 40 and is disposed on one side of the baffle portion 50 provided with the pressure relief hole 20. Exemplarily, the baffle portion 50 includes four side walls 51 connected in sequence, and the four side walls 51 are connected between the sealing plate 60 and the bottom of the housing portion 40 to form a closed cavity 10.

[0060] The outer shell 40 can further isolate the closed cavity 10 from the external environment, so that external water vapor is not easy to enter the closed cavity 10, and the structural strength of the first shell 100 is improved.

[0061] See also Figure 3 , Figure 4 and Figure 7 In some embodiments, an exhaust space 70 is formed between the outer shell 40 and the enclosure 50, and the exhaust space 70 is connected to the pressure relief space 30. A portion of the airflow entering the pressure relief space 30 can enter the exhaust space 70, and the exhaust space 70 helps to disperse the airflow pressure of the pressure relief space 30, so that the pressure relief space 30 and the closed cavity 10 are not easily exploded due to excessive air pressure.

[0062] For example, one of the side walls 51 of the enclosure is used to cooperate with the second shell 200 to form a pressure relief space 30, and the pressure relief hole 20 is provided on the side wall 51; the other three side walls 51 and the side of the outer shell 40 form an exhaust space 70. When the pressure is released, the airflow that cannot be directly discharged from the first exhaust port 201 and the second exhaust port 202 can first enter the exhaust space 70 to reduce the airflow pressure in the pressure relief space 30.

[0063] See also Figure 2 , Figure 3 , Figure 4 and Figure 8 In some embodiments, the direction of the pressure relief hole 20 toward the second housing 200 is defined as the first direction, the first exhaust port 201 and the second exhaust port 202 are arranged opposite to each other in the second direction, the first exhaust port 201 includes a plurality of first through holes 2011, and the first direction is perpendicular to the second direction. The first direction is the X-axis direction shown in the figure, and the second direction is the Y-axis direction shown in the figure. For ease of understanding, the following uses "first direction X" to represent the first direction, and "second direction Y" to represent the second direction.

[0064] After the airflow is discharged from the pressure relief hole 20 to the pressure relief space 30, part of the airflow flowing toward the first exhaust port 201 can be discharged to the outside of the energy storage device 1000 through the multiple first through holes 2011. Discharging the airflow through the multiple first through holes 2011 is conducive to the airflow flowing toward the first exhaust port 201 to quickly discharge the pressure relief space 30.

[0065] See also Figure 2 , Figure 3 and Figure 8 In some embodiments, the plurality of first through holes 2011 are sequentially arranged along the third direction, the second exhaust port 202 includes a plurality of second through holes 2021, and the plurality of second through holes 2021 are sequentially arranged along the third direction, and the third direction is perpendicular to the first direction X and the second direction Y. The third direction is the Z-axis direction shown in the figure, and for ease of understanding, the third direction is referred to as "third direction Z" hereinafter.

[0066] Part of the airflow flowing toward the second exhaust port 202 can be discharged to the outside of the energy storage device 1000 through the plurality of second through holes 2021. The provision of the plurality of second through holes 2021 is conducive to the airflow flowing toward the second exhaust port 202 to be quickly discharged from the pressure relief space 30. The plurality of first through holes 2011 and the plurality of second through holes 2021 are arranged in sequence along the third direction Z, which is conducive to further dispersing the airflow and facilitating rapid pressure relief of the pressure relief space 30.

[0067] See also Figure 4 , Figure 7 and Fig. 9 In some embodiments, the explosion-proof valve 600 includes a brittle waterproof breathable membrane 601, which is configured to be breathable and waterproof, and is configured to be breathable along a first direction X. The airflow pressure value in the closed cavity 10 to which the brittle waterproof breathable membrane 601 is subjected when the brittle waterproof breathable membrane 601 is ruptured is defined as a critical pressure value.

[0068] The brittle waterproof breathable membrane 601 can prevent water from entering the closed cavity 10, making it difficult for the battery pack 300 to come into contact with water vapor and be damp, thereby making the battery pack 300 less susceptible to damage and improving the safety of the energy storage device 1000. The brittle waterproof breathable membrane 601 is also breathable, so that when the battery pack 300 is working, the hot air flow generated by the battery cell 301 can pass through the brittle waterproof breathable membrane 601 and enter the pressure relief space 30, and then be discharged outside the energy storage device 1000, so as to facilitate the heat dissipation of the energy storage device 1000. The brittle texture of the brittle waterproof breathable membrane 601 is conducive to reducing the toughness of the brittle waterproof breathable membrane 601, so that when the battery cell 301 sprays the valve, the brittle waterproof breathable membrane 601 is subjected to the critical pressure value and ruptures, so as to facilitate the rapid opening of the pressure relief hole 20.

[0069] In some embodiments, the brittle waterproof breathable membrane 601 is a poly(p-phenylene ether sulfone) film. The main component of the poly(p-phenylene ether sulfone) film is poly(p-phenylene ether sulfone), which is a polymer material. The poly(p-phenylene ether sulfone) film has good hardness and is easy to break when subjected to a pressure of a critical pressure value, thereby facilitating the opening of the pressure relief hole 20.

[0070] In some embodiments, the thickness of the brittle waterproof breathable membrane 601 satisfies the following relationship: 0.10 mm≤D≤0.20 mm, where D represents the thickness of the brittle waterproof breathable membrane 601 .

[0071] By configuring the thickness of the brittle waterproof breathable membrane 601 to be between 0.10 mm and 0.20 mm, it is advantageous for the brittle waterproof breathable membrane 601 to be stably ruptured when subjected to a pressure reaching a critical pressure value, so as to open the pressure relief hole 20 .

[0072] See also Figure 4 , Figure 7 and Fig. 9 In some embodiments, the explosion-proof valve 600 further includes a bracket 602. The bracket 602 is sealed and arranged at a position of the enclosure corresponding to the pressure relief hole 20. The outer peripheral edge of the brittle waterproof and breathable membrane 601 is attached to the bracket 602.

[0073] The brittle waterproof breathable membrane 601 is sealed and fixed to the enclosure 50 by a bracket 602. The bracket 602 helps to reduce the flatness difference between the pressure relief hole 20 and the brittle waterproof breathable membrane 601, so that the brittle waterproof breathable membrane 601 is packaged to the pressure relief hole 20 in a flat state. On the one hand, the sealing effect of the brittle waterproof breathable membrane 601 is improved, and on the other hand, it is easy for the brittle waterproof breathable membrane 601 to rupture when it is subjected to a critical pressure value.

[0074] In some embodiments, the bracket 602 is arranged between the brittle waterproof breathable membrane 601 and the enclosure 50, the brittle waterproof breathable membrane 601 is adhered to the bracket 602 by glue or double-sided tape, and the bracket 602 is adhered to the enclosure 50 by glue or double-sided tape.

[0075] In some embodiments, the brittle waterproof breathable membrane 601 is arranged between the bracket 602 and the enclosure 50, and the brittle waterproof breathable membrane 601 is adhered to the enclosure 50 by glue or double-sided tape, and the bracket 602 is adhered to the side of the brittle waterproof breathable membrane 601 away from the enclosure 50 by glue or double-sided tape.

[0076] See also Figure 7 and Fig. 9In some embodiments, the support 602 is an annular structure, which is conducive to fixing the brittle waterproof breathable membrane 601 and opening the pressure relief hole 20 after the brittle waterproof breathable membrane 601 is broken, so that the closed cavity 10 is connected with the pressure relief space 30. Exemplarily, the annular shape of the support 602 includes a circular ring, an elliptical ring, a polygonal ring, etc.

[0077] See also Figure 2 and Figure 4 In some embodiments, the outer shell 40 includes a cover 41 and a bottom shell 42, and the cover 41 and the bottom shell 42 are split structures and are detachably connected. By setting the outer shell 40 as a split cover 41 and bottom shell 42, it is convenient to install the battery pack 300 and other structures in the outer shell 40.

[0078] See also Figure 2 and Figure 4 In some embodiments, the housing 40 is provided with an exhaust port 411, which is in communication with the exhaust space 70. Exemplarily, the exhaust port 411 is provided on the cover 41. The airflow of the pressure relief space 30 can enter the airflow of the exhaust space 70 and be discharged to the outside of the energy storage device 1000 through the exhaust port 411. The provision of the exhaust port 411 increases the exhaust path of the gas in the pressure relief space 30, which is more conducive to the rapid pressure relief of the energy storage device 1000.

[0079] See also Figure 2 and Figure 4 In some embodiments, the housing 40 has a receiving cavity 80, the sealing plate 60 separates the receiving cavity 80 from the closed cavity 10, the inverter module 400 is disposed on the sealing plate 60, and the sealing plate 60 supports the inverter module 400. Exemplarily, the receiving cavity 80 is enclosed by the sealing plate 60 and the cover 41. The sealing plate 60 can separate the inverter module 400 from the battery pack 300, so that the airflow generated when the battery cell 301 sprays the valve is not easy to escape directly to the receiving cavity 80, reducing the influence of the battery cell 301 spraying the valve on the inverter module 400.

[0080] See also Figure 2 and Figure 4 In some embodiments, the housing 40 further includes an air inlet 412, which is arranged opposite to the air outlet 411. The inverter module 400 is located between the air inlet 412 and the air outlet 411; the air inlet 412 and the air outlet 411 are respectively connected to the receiving cavity 80, and the receiving cavity 80 is connected to the pressure relief space 30. Exemplarily, the air inlet 412 is arranged on the cover 41, and the receiving cavity 80 is connected to the pressure relief space 30 through the exhaust space 70.

[0081] The air inlet 412 allows external air to enter the receiving cavity 80, and the air outlet 411 facilitates the air in the receiving cavity 80 to be discharged to dissipate heat from the inverter module 400. The air in the pressure relief space 30 can also be discharged through the air inlet 412 and the air outlet 411, which is conducive to increasing the pressure relief speed.

[0082] See also Figure 2 and Figure 4 In some embodiments, the energy storage device 1000 further includes a fan 700, which is disposed in the receiving chamber 80 and configured to introduce external airflow from the air inlet 412. The fan 700 can introduce external airflow into the receiving chamber 80, which is beneficial to the airflow in the receiving chamber 80, thereby improving the heat dissipation effect of the inverter module 400.

[0083] See also Figure 2 , Figure 8 and Fig. 9 In some embodiments, the first housing 100 includes a first buckling portion 90, and the second housing 200 includes a second buckling portion 203, and the first buckling portion 90 is detachably connected to the second buckling portion 203. Exemplarily, the first buckling portion 90 has a slot 91, and the second buckling portion 203 is detachably assembled in the slot 91.

[0084] Through the detachable connection between the first buckling portion 90 and the second buckling portion 203 , the detachable connection between the first shell 100 and the second shell 200 can be achieved, thereby facilitating the assembly and disassembly of the energy storage device 1000 .

[0085] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. An energy storage device, comprising a battery pack, wherein the battery pack comprises a battery cell, characterized in that: include: A first shell, the first shell having a closed cavity, the closed cavity is used to accommodate the battery pack; The first shell is provided with a pressure relief hole, and the pressure relief hole is connected to the closed cavity; An explosion-proof valve, arranged in the first shell; The explosion-proof valve is configured to block the pressure relief hole and can open the pressure relief hole under the pressure generated when the battery core sprays the valve; A second shell, a pressure relief space is formed between the second shell and a side of the first shell having the pressure relief hole, and the pressure relief space is configured to be connected to the closed cavity through the pressure relief hole when the pressure relief hole is opened; the second shell has a first exhaust port and a second exhaust port that are relatively arranged, the first exhaust port and the second exhaust port are located on two opposite sides of the explosion-proof valve, and are used for the airflow in the pressure relief space to be discharged to the outside of the energy storage device.

2. The energy storage device according to claim 1, characterized in that: The direction of the pressure relief hole toward the second shell is defined as a first direction, the first exhaust port and the second exhaust port are arranged opposite to each other in the second direction, the first exhaust port includes a plurality of first through holes, and the first direction is perpendicular to the second direction.

3. The energy storage device according to claim 2, characterized in that: The plurality of first through holes are sequentially arranged along a third direction, the second exhaust port includes a plurality of second through holes, and the plurality of second through holes are sequentially arranged along the third direction, and the third direction is perpendicular to the first direction and the second direction.

4. The energy storage device according to claim 1, characterized in that: The explosion-proof valve comprises a brittle waterproof breathable membrane, which is configured to be breathable and waterproof; the direction of the pressure relief hole toward the second shell is defined as a first direction, and the brittle waterproof breathable membrane is configured to be breathable along the first direction.

5. The energy storage device according to any one of claims 1 to 4, characterized in that: The first shell includes an outer shell portion, an enclosure portion and a sealing plate, the enclosure portion and the sealing plate are arranged in the outer shell portion, the enclosure portion, the sealing plate and part of the outer shell portion are combined to form the closed cavity, the enclosure portion is provided with the pressure relief hole, and the second shell is connected to the outer shell portion and is arranged on a side of the enclosure portion where the pressure relief hole is provided.

6. The energy storage device according to claim 5, characterized in that: An exhaust space is formed between the outer shell and the enclosure, and the exhaust space is communicated with the pressure relief space.

7. The energy storage device according to claim 6, characterized in that: The shell portion is provided with an air outlet, and the air outlet is communicated with the exhaust space.

8. The energy storage device according to claim 5, characterized in that: The outer shell has a receiving cavity, and the sealing plate separates the receiving cavity from the closed cavity; the energy storage device also includes an inverter module, which is electrically connected to the battery pack, located in the receiving cavity and arranged on the sealing plate, and the sealing plate supports the inverter module.

9. The energy storage device according to claim 8, characterized in that: The shell portion includes an air inlet and an air outlet arranged opposite to each other, and the inverter module is located between the air inlet and the air outlet; the air inlet and the air outlet are respectively connected to the receiving cavity, and the receiving cavity is connected to the pressure relief space.

10. The energy storage device according to claim 9, characterized in that: The energy storage device further includes a fan, which is disposed in the receiving chamber and configured to introduce external airflow from the air inlet.

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