Energy storage device

Abstract

The invention provides an energy storage device. The energy storage equipment comprises a shell, an exhaust part, at least one battery pack, a first flow guide piece and a first channel. The shell comprises a first wall and a second wall which are oppositely arranged in the first direction. The exhaust part is arranged on the first wall. The battery pack is arranged in the shell. The battery pack includes a pressure relief portion. The pressure relief part is arranged on one side of the battery pack close to the first wall. The first flow guide piece is arranged in the shell. The first flow guide piece comprises a base part and a flow guide part connected with the base part. And the flow guide part faces the pressure relief part. The first channel is located between the base and the first wall. The base and the first wall serve as at least partial members forming the first channel. The flow guide part is located in the first channel. The exhaust portion is configured to exhaust gas within the first passage out of the housing. The base includes a diversion opening. The flow guide opening communicates with the first channel. The pressure relief part is exposed out of the flow guide opening. Observed in the first direction, the flow guide part is at least partially located in the flow guide opening.

Description

Technical Field

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

[0002] Energy storage technology is a type of energy storage technology. Energy storage technology can convert electrical energy into other forms of energy for storage, and then when electrical energy is needed, other forms of energy can be converted back into electrical energy. Energy storage equipment is a device used to store electrical energy. In the development of energy storage technology, how to ensure the safety of energy storage equipment is one of the research directions in energy storage technology. Summary of the invention

[0003] In view of the above problems, the present application provides an energy storage device, which can improve the safety of the energy storage device.

[0004] The present application provides an energy storage device, which includes a housing, an exhaust portion, at least one battery pack, a first flow guide, and a first channel.

[0005] The housing includes a first wall and a second wall arranged opposite to each other along a first direction. The exhaust portion is arranged on the first wall. The battery pack is arranged in the housing. The battery pack includes a pressure relief portion. The pressure relief portion is arranged on a side of the battery pack close to the first wall. The first flow guide is arranged in the housing. The first flow guide includes a base and a flow guide connected to the base. The flow guide faces the pressure relief portion. The first channel is located between the base and the first wall. The base and the first wall serve as at least partial components for forming the first channel. The flow guide is located in the first channel. The exhaust portion is configured to discharge the gas in the first channel out of the housing. The base includes a flow guide opening. The flow guide opening is connected to the first channel. The pressure relief portion is exposed in the flow guide opening. When viewed along the first direction, at least part of the flow guide is located in the flow guide opening.

[0006] The energy storage device of the embodiment of the present application, the housing can provide a mounting base for the battery pack. The housing can protect the battery pack and reduce the possibility of structural damage to the battery pack due to collision. The battery pack is used to store electrical energy. When the energy storage device needs to discharge externally, the battery pack can output electrical energy. The battery pack is a device that can convert electrical energy into chemical energy, and can also convert chemical energy into electrical energy.

[0007] When thermal runaway occurs in the battery pack, the internal pressure of the battery pack increases. The pressure relief part of the battery pack is configured to open in response to the internal pressure of the battery pack rising to the pressure threshold of the pressure relief part to release the internal pressure of the battery pack, reduce the possibility of continuous increase in the internal pressure of the battery pack and explosion, and improve the safety of the battery pack.

[0008] When the battery pack has thermal runaway and the pressure relief part opens to relieve pressure, the pressure relief part sprays out high-temperature gas. The gas contacts the flow guide part after passing through the flow guide opening. The flow guide part is configured to guide the flow of gas. The gas enters the first channel under the guidance of the flow guide part. The gas in the first channel can be discharged outside the housing through the exhaust part. The pressure relief part reduces the accumulation of gas in the housing, reduces the possibility of high-temperature damage to other structural parts in the housing caused by high-temperature gas, and improves the safety of the energy storage device.

[0009] In one or more of the above optional embodiments, when viewed along the first direction, the flow guide portion covers the pressure relief portion.

[0010] When thermal runaway occurs in the battery pack and the pressure relief portion opens and sprays gas, the gas sprayed from the pressure relief portion can be blocked by the flow guide portion, so that the gas can change its flow direction under the guidance of the flow guide portion.

[0011] In one or more of the above optional embodiments, the guide portion includes an inclined portion connected to the base, and the inclined portion and the base form an obtuse angle.

[0012] When the gas ejected from the pressure relief portion encounters the inclined portion of the flow guide portion, the inclined portion can guide the flow direction of the gas. The inclined portion and the base form an obtuse angle, and the force of the gas ejected from the pressure relief portion acting on the inclined portion in the first direction is relatively small, reducing the possibility that the inclined portion loses its flow guide ability due to deformation.

[0013] In one or more optional embodiments above, the guide portion includes a flat portion, the flat portion is connected to the inclined portion, the flat portion faces the guide opening, the flat portion and the first wall form a first gap, and the inclined portion and the first wall form a second gap.

[0014] A second gap is formed between the inclined portion and the first wall. After the gas ejected from the pressure relief portion is guided by the inclined portion, the flow direction of the gas changes. The gas with the changed flow direction can enter the first channel under the further guidance of the flat portion. After the gas ejected from the pressure relief portion is further guided by the flat portion, the flow direction of the gas tends to be stable, reducing the possibility of turbulence in the gas and reducing the gas flow rate.

[0015] In one or more of the above optional embodiments, when viewed along the first direction, both the flat portion and the inclined portion are located within the flow guide opening.

[0016] After the gas ejected from the pressure relief portion passes through the guide opening of the base, the entire guide portion can be used to guide the gas, thereby facilitating improving the guide effect.

[0017] In one or more optional embodiments above, the housing includes a bottom and a top relatively arranged along the second direction, the first direction is perpendicular to the second direction; along the second direction, the flat portion is closer to the exhaust portion than the inclined portion.

[0018] After the gas ejected from the pressure relief portion passes through the flow guide opening of the base, the inclined portion first guides the gas to change its flow direction. Then, the flat portion of the flow guide portion can guide the gas to flow toward the exhaust portion, which is conducive to the gas flowing to the exhaust portion faster. The inclined portion has the function of blocking the gas from flowing back to the exhaust portion, reducing the possibility that the gas fails to flow toward the exhaust portion after passing through the flow guide opening of the base, which is conducive to the gas flowing to the exhaust portion in time and discharging the pressure through the exhaust portion.

[0019] In one or more of the above optional embodiments, the base includes a bottom wall, a side wall surrounding the bottom wall and an extension portion extending from the side wall, the guide opening is provided in the bottom wall, and the guide portion is connected to the bottom wall.

[0020] In one or more of the above optional embodiments, along a direction opposite to the first direction, the guide portion is lower than the extension portion.

[0021] In one or more of the above optional embodiments, the extension portion is sealed to the first wall, which helps to reduce the possibility of gas leakage from between the extension portion of the base and the first wall of the housing.

[0022] In one or more optional embodiments above, the energy storage device includes a second flow guide member connected to the flow guide opening, and the second flow guide member is sealed and connected to the base. When viewed along the first direction, the second flow guide member is arranged around the outside of the pressure relief portion, and the pressure relief portion is located inside the second flow guide member. The battery pack includes a box body, the pressure relief portion is arranged in the box body, and the second flow guide member is sealed and connected to the box body.

[0023] The second guide member can be configured to guide the gas flow ejected from the pressure relief portion to the guide opening, and the pressure relief portion is conducive to increasing the flow rate of the gas. The box body and the base of the first guide member are each sealed and connected to the second guide member, reducing the outflow of gas from between the second guide member and the box body and between the second guide member and the base.

[0024] In one or more of the above optional embodiments, one end of the second flow guide member abuts against the box body, and the other end of the second flow guide member abuts against the base.

[0025] The second flow guide member and the box body are sealed by a close fitting contact. The second flow guide member and the base are sealed by a close fitting contact. This is beneficial to reducing the number of parts and reducing assembly procedures.

[0026] In one or more of the above optional embodiments, the second flow guide member is arranged around the flow guide opening.

[0027] The gas guided by the second guide member enters the guide opening. Under the guidance and restraint of the second guide member, the guided gas accumulates toward the guide opening and quickly passes through the guide opening, thereby increasing the gas flow rate.

[0028] In one or more optional embodiments above, the housing includes a bottom and a top arranged opposite to each other along the second direction. The exhaust portion includes a first opening penetrating the first wall, the first opening is connected to the first channel, and along the second direction, the first opening is closer to the top than the guide portion. The exhaust portion faces the bottom wall.

[0029] The first channel is connected to the external environment of the shell through the exhaust part. When the shell is in normal use, the first channel can maintain pressure balance with the external environment of the shell. When the battery pack has thermal runaway and the pressure relief part sprays gas, the gas enters the first channel through the guide opening, then flows toward the exhaust part in the first channel, and finally is discharged from the exhaust part to the external environment of the shell. The gas in the first channel of the exhaust part can be discharged directly from the first opening, and the exhaust part is conducive to improving the gas discharge efficiency.

[0030] In one or more optional embodiments above, the housing includes a bottom and a top arranged relatively along the second direction. The housing includes a plurality of second openings arranged on the first wall. The second openings penetrate the first wall. The first channel is connected to the second openings. Along the second direction, the second openings are closer to the bottom than the guide portion.

[0031] In one or more of the above optional embodiments, the guide portion is a cantilever structure.

[0032] The connection point between the guide part and the base is relatively small, which is beneficial to reducing the flow resistance of the guide part to the gas and facilitating the gas to quickly pass through the gap between the guide part and the base.

[0033] In one or more of the above optional embodiments, when viewed along the first direction, there is a third gap between both sides of the guide portion and the guide opening along the third direction.

[0034] After the gas ejected from the pressure relief part passes through the guide opening, part of the gas flows through the third gap between the guide part and the base and enters the first channel. There are third gaps between both sides of the guide part and the guide opening, which is conducive to the guide part guiding the gas to quickly enter the first channel.

[0035] In one or more of the above optional embodiments, when viewed along the first direction, there is a fourth gap between the guide portion and the guide opening along the third direction.

[0036] After the gas ejected from the pressure relief portion passes through the guide opening, the gas flows through the fourth gap and enters the first channel, which is beneficial for the guide portion to guide the gas to quickly enter the first channel.

[0037] In one or more optional embodiments above, the energy storage device includes a plurality of battery packs arranged in the housing along the second direction, the flow guide includes a plurality of flow guide openings and a plurality of flow guide portions, and one flow guide opening corresponds to one pressure relief portion.

[0038] In multiple battery packs, when a battery pack experiences thermal runaway, the gas ejected from the pressure relief portion of the battery pack experiencing thermal runaway can enter the first channel through the corresponding guide openings and guide portions, which is beneficial for the flow direction of the gas ejected from each battery pack experiencing thermal runaway to become stable, thereby facilitating the gas to flow quickly to the exhaust portion for discharge.

[0039] In one or more optional embodiments above, at least part of the second opening and the base are arranged opposite to each other, and when viewed along the first direction, part of the side wall and part of the extension are located in the same second opening along the second direction.

[0040] The liquid entering the base can be discharged from the second opening, further reducing the possibility of liquid accumulation and overflowing from the diversion opening, thereby improving the safety of the energy storage device.

[0041] In one or more of the above optional embodiments, the side wall and the extension portion form an obtuse angle.

[0042] The obtuse angle formed between the side wall of the base and the extension portion is beneficial to improving the liquid discharge efficiency.

[0043] In one or more optional embodiments above, the energy storage device includes a partition plate and an electrical device, both of which are arranged in the housing, and along the second direction, the battery pack is arranged above the partition plate, and the electrical device is arranged below the partition plate.

[0044] The partition plate can separate the internal space of the housing into different spaces. The partition plate can separate the battery pack and the electrical device. When the battery pack has thermal runaway, the partition plate blocks high-pressure gas or high-temperature substances from entering the space where the electrical device is located, which helps to reduce the possibility of damage to the electrical device caused by high-pressure gas or high-temperature substances and improve the safety of the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0046] Figure 1 is a schematic diagram of the structure of a housing provided by an embodiment of the present application;

[0047] Figure 2 It is a partial structural schematic diagram of a housing provided in one embodiment of the present application;

[0048] Figure 3 for Figure 2 The enlarged schematic diagram of M in FIG.

[0049] Figure 4 is a schematic structural diagram of a battery pack provided in one embodiment of the present application;

[0050] Figure 5 is a schematic diagram of a partial cross-sectional structure of a housing provided in an embodiment of the present application;

[0051] Figure 6 for Figure 5 The enlarged schematic diagram at W in FIG.

[0052] Figure 7 is a schematic structural diagram of a flow guide member provided in an embodiment of the present application;

[0053] Figure 8 for Figure 5 The enlarged schematic diagram of P in FIG.

[0054] Fig. 9 This is a schematic diagram of the connection structure between a battery pack and an annular body guide provided in one embodiment of the present application;

[0055] Fig.10 This is a schematic structural diagram of an annular body guide provided in one embodiment of the present application;

[0056] Fig.11 is a schematic structural diagram of a flow guide member provided in an embodiment of the present application;

[0057] Fig.12 It is a schematic diagram of the connection structure of the flow guide member and the annular flow guide body provided in one embodiment of the present application.

[0058] Description of reference numerals:

[0059] 10. Energy storage equipment;

[0060] 20. housing; 201. first wall; 202. second wall; 203. second opening; 21. bottom; 22. top;

[0061] 30. exhaust portion; 301. first opening;

[0062] 40. battery pack; 401. pressure relief unit; 41. box body;

[0063] 50, first flow guide; 50a, third gap; 50b, fourth gap;

[0064] 51, base; 501, diversion opening; 511, bottom wall; 512, side wall; 513, extension part;

[0065] 52, guide portion; 521, inclined portion; 522, flat portion;

[0066] 60. A second flow guide;

[0067] 70. Divider plate;

[0068] 80. Electrical installations;

[0069] 100, first channel;

[0070] X, first direction;

[0071] Y, second direction;

[0072] Z. The third direction. DETAILED DESCRIPTION

[0073] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0074] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0075] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0076] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0077] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0078] Figure 1 The structure of the housing 20 is schematically shown. Figure 2A partial structure of the housing 20 is schematically shown. Figure 3 for Figure 2 Enlarged view of point M in . Figure 4 The structure of the battery pack 40 is schematically shown. Figure 5 The partial cross-sectional structure of the housing 20 is schematically shown. Figure 6 for Figure 5 Enlarged view of point W in the figure. Figure 7 The structure of the first flow guide 50 is schematically shown. Figure 8 for Figure 5 Enlarged view of point P in . Fig. 9 The connection structure between the battery pack 40 and the second guide member 60 is schematically shown. Fig.10 The structure of the second flow guide 60 is schematically shown. Fig.11 The structure of the first flow guide 50 is schematically shown. Fig.12 The connection structure of the first flow guide member 50 and the second flow guide member 60 is schematically shown.

[0079] See also Figures 1 to 7 As shown, an embodiment of the present application provides an energy storage device 10, which includes a housing 20, an exhaust portion 30, and at least one battery pack 40, and the battery pack 40 is located in the housing 20. The housing 20 includes a first wall 201 and a second wall 202 that are arranged opposite to each other along a first direction X. The exhaust portion 30 is arranged on the first wall 201. The battery pack 40 includes a pressure relief portion 401. The pressure relief portion 401 is arranged on a side of the battery pack 40 close to the first wall 201.

[0080] In some achievable embodiments, the energy storage device 10 includes a first flow guide 50 and a first channel 100. The first flow guide 50 is disposed in the housing 20. The first flow guide 50 includes a base 51 and a flow guide 52 connected to the base 51. The first channel 100 is located between the base 51 and the first wall 201. The flow guide 52 is located in the first channel 100. The flow guide 52 and the pressure relief portion 401 are arranged opposite to each other. The exhaust portion 30 is configured to discharge the gas in the first channel 100 out of the housing 20. The base 51 includes a flow guide opening 501. The flow guide opening 501 is connected to the first channel 100. The pressure relief portion 401 is exposed at the flow guide opening 501.

[0081] In some achievable embodiments, the base 51 and the first wall 201 serve as at least a part of the components forming the first channel 100. Optionally, the first flow guide 50 and the first wall 201 are in contact and connected to form the first channel 100. Optionally, the first flow guide 50 and the first wall 201 are connected by a sealing member, and the first flow guide 50, the first wall 201 and the sealing member together form the first channel 100, and the sealing member includes but is not limited to an adhesive member, a sealing ring, etc. Optionally, there is a gap between the first flow guide 505 and the first wall 201, and the first flow guide 50, the first wall 201 and the gap together form the first channel 100.

[0082] See also Figure 7 As shown, when viewed along the first direction X, at least part of the guide portion 52 is located in the guide opening 501. Optionally, when viewed along the first direction X, part of the guide portion 52 is located in the guide opening 501. Optionally, when viewed along the first direction X, all of the guide portion 52 is located in the guide opening 501.

[0083] The energy storage device 10 of the embodiment of the present application, the housing 20 can provide an installation base for the battery pack 40. The housing 20 can protect the battery pack 40 and reduce the possibility of structural damage to the battery pack 40 due to collision. The battery pack 40 is used to store electrical energy. When the energy storage device 10 needs to discharge externally, the battery pack 40 can output electrical energy. The battery pack 40 is a device that can convert electrical energy into chemical energy, and can also convert chemical energy into electrical energy.

[0084] When thermal runaway occurs in the battery pack 40, the internal pressure of the battery pack 40 increases. The pressure relief portion 401 of the battery pack 40 is configured to open in response to the internal pressure of the battery pack 40 rising to the pressure threshold of the pressure relief portion 401 to release the internal pressure of the battery pack 40, reduce the possibility of continuous increase in the internal pressure of the battery pack 40 and explosion, and improve the safety of the battery pack 40.

[0085] When thermal runaway occurs in the battery pack 40 and the pressure relief part 401 opens to relieve pressure, the pressure relief part 401 ejects high-temperature gas. After passing through the guide opening 501, the gas contacts the guide part 52. The guide part 52 is configured to guide the flow of gas. The gas enters the first channel 100 under the guidance of the guide part 52. The gas in the first channel 100 can be discharged from the outer shell 20 through the exhaust part 30. The pressure relief part 401 reduces the accumulation of gas in the outer shell 20, reduces the possibility of high-temperature gas causing high-temperature damage to other structural parts in the outer shell 20, and improves the safety of the energy storage device 10.

[0086] In some achievable ways, the exhaust portion 30 and the housing 20 can each be a separately manufactured component. The exhaust portion 30 can be assembled with the first wall 201 of the housing 20 by mechanical connection. In some examples, the exhaust portion 30 can be a pressure relief valve assembly.

[0087] In some practicable embodiments, the exhaust portion 30 may be a part of the first wall 201, that is, the exhaust portion 30 and the first wall 201 are an integrally formed structure. The housing 20 that has been processed and formed has both the first wall 201 and the exhaust portion 30.

[0088] In some possible implementations, see Figure 2 , Figure 5 and Figure 7As shown, the energy storage device 10 includes a plurality of battery packs 40 disposed in the housing 20 along the second direction Y. The first flow guide 50 includes a plurality of flow guide openings 501 and a plurality of flow guide portions 52. One flow guide opening 501 corresponds to one pressure relief portion 401.

[0089] Among multiple battery packs 40, when a battery pack 40 experiences thermal runaway, the gas ejected from the pressure relief portion 401 of the battery pack 40 experiencing thermal runaway can enter the first channel 100 through the corresponding guide openings 501 and the guide portion 52, which is beneficial for the flow direction of the gas ejected from each battery pack 40 experiencing thermal runaway to become stable, thereby facilitating the gas to quickly flow to the exhaust portion 30 for discharge.

[0090] In some possible implementations, see Figure 2 As shown, when viewed along the first direction X, the guide portion 52 of the first guide member 50 covers the pressure relief portion 401. When viewed along the first direction X, the pressure relief portion 401 of the battery pack 40 is blocked by the guide portion 52 and the pressure relief portion 401 cannot be observed. When the battery pack 40 has thermal runaway and the pressure relief portion 401 opens and ejects gas, the gas ejected from the pressure relief portion 401 can be blocked by the guide portion 52, so that the gas can change the flow direction under the guidance of the guide portion 52.

[0091] In some possible implementations, see Figures 5 to 8 As shown, the guide portion 52 includes an inclined portion 521 connected to the base 51. The inclined portion 521 and the base 51 form an obtuse angle K1. When the gas ejected from the pressure relief portion 401 encounters the inclined portion 521 of the guide portion 52, the inclined portion 521 can guide the flow direction of the gas. The inclined portion 521 and the base 51 form an obtuse angle K1, and the component of the force of the gas ejected from the pressure relief portion 401 acting on the inclined portion 521 in the first direction X is relatively small, which reduces the possibility that the inclined portion 521 is deformed and causes the inclined portion 521 to lose its guiding ability.

[0092] In some achievable embodiments, 120°≤K1≤175°.

[0093] In some possible implementations, see Figures 5 to 8As shown, the guide portion 52 includes a flat portion 522. The flat portion 522 is connected to the inclined portion 521. The flat portion 522 faces the guide opening 501. A first gap L1 is formed between the flat portion 522 and the first wall 201 of the housing 20. A second gap L2 is formed between the inclined portion 521 and the first wall 201. After the gas ejected from the pressure relief portion 401 is guided by the inclined portion 521, the flow direction of the gas changes. The gas with changed flow direction can enter the first channel 100 under the further guiding effect of the flat portion 522. After the gas ejected from the pressure relief portion 401 is further guided by the flat portion 522, the flow direction of the gas tends to be stable, reducing the possibility of gas turbulence and reducing the gas flow rate.

[0094] In some examples, the first gap L1 has a value ranging from 1 mm to 3 mm, and the second gap L2 has a value ranging from 8 mm to 20 mm.

[0095] In some possible implementations, see Figure 7 As shown, viewed along the first direction X, the flat portion 522 and the inclined portion 521 are both located in the guide opening 501 of the base 51. After the gas ejected from the pressure relief portion 401 passes through the guide opening 501 of the base 51, the entire guide portion 52 can be used to guide the gas, thereby facilitating improving the guide effect.

[0096] In some possible implementations, see Fig.12 As shown, when viewed along the first direction X, the area of ​​the guide opening 501 is larger than the area of ​​the guide portion 52 . When viewed along a direction opposite to the first direction X, the entire guide portion 52 can be viewed through the guide opening 501 of the base 51 .

[0097] In some examples, the guide part 52 and the base 51 may be integrally formed. For example, the blank used to process the first guide member 50 may be partially stamped, and a partial area is stamped to form the guide opening 501 on the base 51, and the stamped partial area simultaneously forms the guide part 52. The integrally formed manner of the guide part 52 and the base 51 is conducive to improving the connection strength between the guide part 52 and the base 51. For example, the blank used to process the first guide member 50 may be a plate. The material of the plate may include but is not limited to steel, iron, and aluminum.

[0098] In some examples, the inclined portion 521 and the flat portion 522 of the air guide portion 52 are both plate-shaped structures.

[0099] In some possible implementations, see Figure 3 and Figure 7As shown, the guide portion 52 is a cantilever structure. The guide portion 52 is connected to the base 51 only through the inclined portion 521. The flat portion 522 is not directly connected to the base 51. The connection point between the guide portion 52 and the base 51 is relatively small, which is conducive to reducing the flow resistance of the guide portion 52 to the gas and facilitating the gas to quickly pass through the gap between the guide portion 52 and the base 51.

[0100] For some examples, see Figure 8 As shown, an obtuse angle K2 is formed between the flat portion 522 and the inclined portion 521 of the guide portion 52. After the gas ejected from the pressure relief portion 401 is guided by the inclined portion 521, the flow direction of the gas changes. The flow resistance generated by the flat portion 522 to the gas whose flow direction changes is relatively small. The gas whose flow direction changes can flow smoothly from the inclined portion 521 to the flat portion 522.

[0101] In some achievable embodiments, 120°≤K2≤175°.

[0102] In some possible implementations, see Figure 2 , Figure 5 and Figure 6 As shown, the housing 20 includes a bottom 21 and a top 22 arranged relatively along a second direction Y. The second direction Y refers to a direction from the bottom 21 to the top 22. The first direction X and the second direction Y may be perpendicular to each other. When the housing 20 is placed on a support platform, the bottom 21 of the housing 20 is closer to the support platform than the top 22. Along the second direction Y, the flat portion 522 of the guide portion 52 is closer to the exhaust portion 30 than the inclined portion 521.

[0103] After the gas ejected from the pressure relief portion 401 passes through the guide opening 501 of the base 51, the inclined portion 521 first guides the gas to change its flow direction. Then, the flat portion 522 of the guide portion 52 can guide the gas to flow toward the exhaust portion 30, which is conducive to the gas flowing to the exhaust portion 30 faster. The inclined portion 521 has the function of blocking the gas from flowing back to the exhaust portion 30, reducing the possibility that the gas fails to flow toward the exhaust portion 30 after passing through the guide opening 501 of the base 51, which is conducive to the gas flowing to the exhaust portion 30 in time and discharging the pressure through the exhaust portion 30.

[0104] In some examples, along the second direction Y, the flat portion 522 of each guide portion 52 is closer to the exhaust portion 30 than the inclined portion 521. Among the multiple battery packs 40, when the battery pack 40 located at the bottom has thermal runaway, the gas ejected from the pressure relief portion 401 of the battery pack 40 at the bottom can enter the first channel 100 through the corresponding guide opening 501 and the guide portion 52. After the gas ejected from the battery pack 40 at the bottom enters the first channel 100, it can flow toward the first guide member 50 at the top. The flat portion 522 of the guide portion 52 is arranged closer to the exhaust portion 30 than the inclined portion 521, and the upper inclined portion 521 can have the function of dispersing the airflow at the bottom, reducing the influence of the gas ejected from the battery pack 40 at the bottom on the gas ejected from the battery pack 40 at the top, and reducing the possibility that the gas ejected from the battery pack 40 at the top is affected by the pressure of the gas ejected from the battery at the bottom and is not easy to enter the first channel 100 smoothly. When thermal runaway occurs in multiple battery packs 40 , the gas ejected from each battery pack 40 can enter the first channel 100 through the corresponding guide openings 501 and guide portions 52 , which is beneficial to improving exhaust efficiency.

[0105] For some examples, see Figure 4 As shown, a battery pack 40 includes a pressure relief portion 401 .

[0106] For some examples, see Figure 5 As shown, the housing 20 includes four battery packs 40. The first flow guide 50 includes four flow guide openings 501 and four flow guide portions 52. The four flow guide openings 501 are all connected to a first channel 100. The four flow guide portions 52 are all located in a first channel 100.

[0107] In some possible implementations, see Figure 7 As shown, when viewed along the first direction X, along the third direction Z, there are third gaps 50a between both sides of the guide portion 52 and the guide opening 501. Figure 7 As shown, when viewed along the first direction X, along the third direction Z, the two sides of the inclined portion 521 are separated from the base 51 , and the flat portion 522 is separated from the guide opening of the base 51 .

[0108] After the gas ejected from the pressure relief portion 401 passes through the guide opening 501, part of the gas flows through the third gap 50a between the guide portion 52 and the base 51 and enters the first channel 100. There are third gaps 50a on both sides of the guide portion 52 and between the guide opening 501, which is conducive to the guide portion 52 guiding the gas to quickly enter the first channel 100.

[0109] For some examples, see Figure 7 As shown, the guide portion 52 is rectangular as a whole when viewed along the first direction X. The guide opening 501 is rectangular in shape.

[0110] For example, see Figure 7 As shown, when viewed along the first direction X, the inclined portion 521 and the flat portion 522 of the air guide portion 52 are each rectangular.

[0111] In some feasible embodiments, when observed along the first direction X, the shape of the guide opening 501 can be triangular, trapezoidal, pentagonal, or circular, and the guide portion 52 as a whole is triangular, trapezoidal, pentagonal, or circular, which is not specifically limited in the embodiments of the present application.

[0112] In some possible implementations, see Figure 7 As shown, when viewed along the first direction X, along the third direction Z, there is a fourth gap 50 b between the guide portion 52 and the guide opening 501 .

[0113] After the gas ejected from the pressure relief portion 401 passes through the guide opening 501 , the gas flows through the fourth gap 50 b and enters the first channel 100 , which helps the guide portion 52 to guide the gas to quickly enter the first channel 100 .

[0114] In some possible implementations, see Figure 7 As shown, the base 51 includes a bottom wall 511, a side wall 512 surrounding the bottom wall 511, and an extension portion 513 extending from the side wall 512. The flow guide opening 501 is provided on the bottom wall 511, and passes through the bottom wall 511 along the first direction X. The flow guide portion 52 is connected to the bottom wall 511.

[0115] In some examples, the extension portion 513 extends from the side wall 512 in a direction away from the guide portion 52. The extension portion 513 may be connected to the first wall 201 of the housing 20. For example, the extension portion 513 of the base 51 may be detachably connected to the first wall 201 of the housing 20 by fasteners such as screws.

[0116] In some examples, the extension portion 513 of the base 51 is an annular structure that completely surrounds the side wall 512 .

[0117] In some achievable embodiments, the extension portion 513 is sealedly connected to the first wall 201 , which helps to reduce the possibility of gas leakage between the extension portion 513 of the base 51 and the first wall 201 of the housing 20 .

[0118] In some examples, an adhesive is provided between the extension 513 and the first wall 201. The adhesive bonds the extension 513 to the first wall 201. The extension 513 and the first wall 201 are sealed by the adhesive, which helps to reduce the possibility of gas leakage from the extension 513 and the first wall 201. Exemplarily, the adhesive may include but is not limited to glue or double-sided tape. The extension 513 and the first wall 201 are connected by the adhesive, and the first flow guide 50, the first wall 201 and the adhesive together form the first channel 100.

[0119] In some examples, a sealing ring may be provided between the extension portion 513 and the first wall 201. The extension portion 513 and the first wall 201 may co-extrude the sealing ring. The sealing ring is used to seal the extension portion 513 and the first wall 201, which is conducive to reducing the possibility of gas leakage from between the extension portion 513 and the first wall 201.

[0120] The extension portion 513 and the first wall 201 are connected via a sealing ring, and the first flow guide member 50 , the first wall 201 and the sealing ring together form a first channel 100 .

[0121] In some examples, the extension 513 is in contact with the first wall 201, and the extension 513 and the first wall 201 are sealed by close contact, which helps to reduce the possibility of gas leakage between the extension 513 and the first wall 201. The first flow guide 50 and the first wall 201 form a first channel 100.

[0122] In some achievable embodiments, a small gap may be formed between the extension portion 513 and the first wall 201. In some examples, along the first direction X, the gap between the extension portion 513 and the first wall 201 is less than 2 millimeters (mm).

[0123] In some achievable embodiments, the guide portion 52 is lower than the extension portion 513 in a direction opposite to the first direction X. A gap may be formed between the guide portion 52 and the first wall 201. The guide portion 52 and the first wall 201 are in a non-contact state, thereby reducing interference between the first wall 201 and the guide portion 52. Exemplarily, a first gap L1 is formed between the flat portion 522 and the first wall 201, and a second gap L2 is formed between the inclined portion 521 and the first wall 201.

[0124] In some possible implementations, see Figures 8 to 12 As shown, the energy storage device 10 includes a second flow guide 60 connected to the flow guide opening 501. One second flow guide 60 is provided on one battery pack 40. Fig. 9 As shown, when viewed along the first direction X, the second guide member 60 is disposed around the pressure relief portion 401. The pressure relief portion 401 is located inside the second guide member 60. The second guide member 60 is connected to the guide opening 501 of the base 51. The battery pack 40 includes a box body 41. The pressure relief portion 401 is disposed in the box body 41.

[0125] In some examples, the pressure relief portion 401 may be a pressure relief valve assembly. The second flow guide 60 is sealedly connected to the box body 41. The second flow guide 60 is sealedly connected to the base 51.

[0126] The second guide member 60 is a hollow structure. The second guide member 60 can be configured to guide the gas flow ejected from the pressure relief portion 401 to the guide opening 501, and the pressure relief portion 401 is conducive to increasing the flow rate of the gas. The box body 41 and the base 51 of the first guide member 50 are each sealed and connected to the second guide member 60, reducing the outflow of gas from between the second guide member 60 and the box body 41 and between the second guide member 60 and the base 51.

[0127] In some examples, an adhesive may be provided between the second flow guide 60 and the box body 41. The adhesive bonds the second flow guide 60 to the box body 41. The second flow guide 60 and the box body 41 are sealed by the adhesive, which helps to reduce the possibility of gas leakage from between the second flow guide 60 and the box body 41.

[0128] In some examples, a sealing ring may be provided between the second flow guide 60 and the box body 41. The second flow guide 60 and the box body 41 jointly squeeze the sealing ring. The second flow guide 60 and the box body 41 are sealed by the sealing ring, which is conducive to reducing the possibility of gas leakage from the second flow guide 60 and the box body 41.

[0129] In some examples, the second flow guide 60 is directly abutted against the box body 41 , and the second flow guide 60 and the box body 41 are sealed by close fitting contact, which helps to reduce the possibility of gas leakage between the second flow guide 60 and the box body 41 .

[0130] In some examples, an adhesive may be provided between the second guide member 60 and the base 51. The adhesive bonds the second guide member 60 to the base 51. The second guide member 60 and the base 51 are sealed by the adhesive, which helps to reduce the possibility of gas leakage from between the second guide member 60 and the base 51.

[0131] In some examples, a sealing ring may be provided between the second flow guide 60 and the base 51. The second flow guide 60 and the base 51 jointly extrude the sealing ring. The second flow guide 60 and the base 51 are sealed by the sealing ring, which helps to reduce the possibility of gas leakage from between the second flow guide 60 and the base 51.

[0132] In some examples, the second guide member 60 directly abuts against the base 51 , so that the second guide member 60 and the base 51 are sealed by close fitting contact, which helps to reduce the possibility of gas leakage between the second guide member 60 and the base 51 .

[0133] In some examples, the second guide member 60 may be an elastic body. The second guide member 60 may be compressed and deformed by being squeezed. When the second guide member 60 is disposed between the box body 41 and the first guide member 50, the box body 41 and the first guide member 50 may jointly squeeze the second guide member 60, so that the second guide member 60 may be pressed more tightly against the box body 41 and the base 51 of the first guide member 50 under the action of its own elastic force.

[0134] In some examples, the material of the second flow guide 60 may include, but is not limited to, rubber.

[0135] In some possible implementations, see Figure 8 and Fig. 9 As shown, one end of the second guide member 60 abuts against the box body 41. The other end of the second guide member 60 abuts against the base 51. The second guide member 60 and the box body 41 are sealed by a close fit. The second guide member 60 and the base 51 are sealed by a close fit. This is beneficial to reducing the number of parts and reducing assembly processes.

[0136] In some possible implementations, see Figure 8 As shown, the second guide member 60 is disposed around the guide opening 501. The gas guided by the second guide member 60 enters the guide opening 501. Under the guidance and restraint of the second guide member 60, the guided gas accumulates toward the guide opening 501 and quickly passes through the guide opening 501, thereby increasing the gas flow rate. Figure 6 or Figure 8 As shown, along the second direction Y, the lowest point D1 on the inner wall of the second flow guide 60 may be flush with the lower edge of the flow guide opening 501. When liquid (such as water) enters the second flow guide 60 through the flow guide opening, the liquid in the second flow guide 60 may be discharged into the first channel 100 through the flow guide opening 501, thereby reducing the liquid remaining in the second flow guide 60.

[0137] In some examples, along the second direction Y, the lowest point D1 on the inner wall of the second flow guide 60 is located above the lower edge of the flow guide opening 501. When liquid enters the second flow guide 60, the liquid in the second flow guide 60 can be discharged into the first channel 100 through the flow guide opening 501, thereby reducing the liquid from being retained in the second flow guide 60.

[0138] In some possible implementations, see Figure 5 and Figure 6As shown, the housing 20 includes a bottom 21 and a top 22 that are arranged opposite to each other along the second direction Y. The exhaust portion 30 includes a first opening 301 that passes through the first wall 201. The first opening 301 is connected to the first channel 100. Along the second direction Y, the first opening 301 is closer to the top 22 than the guide portion 52. The exhaust portion 30 faces the bottom wall 511.

[0139] The first channel 100 is connected to the external environment of the housing 20 through the exhaust portion 30. When the housing 20 is in normal use, the first channel 100 can maintain pressure balance with the external environment of the housing 20. When the battery pack 40 has thermal runaway and the pressure relief portion 401 ejects gas, the gas enters the first channel 100 through the guide opening 501, then flows toward the exhaust portion 30 in the first channel 100, and finally is discharged from the exhaust portion 30 to the external environment of the housing 20. The gas in the first channel 100 of the exhaust portion can be discharged directly from the first opening 301, and the exhaust portion 30 is conducive to improving the gas discharge efficiency.

[0140] In some examples, the exhaust portion 30 may include a plurality of first openings 301 .

[0141] In some possible implementations, see Figure 5 and Figure 6 As shown, the exhaust portion 30 and the base portion 51 are disposed opposite to each other. The exhaust portion 30 is disposed closer to the bottom 21 of the housing 20 than the extension portion 513 .

[0142] After the liquid outside the exhaust housing 20 enters the housing 20 from the first opening 301, the liquid can be blocked by the base 51, limiting the liquid from flowing to the battery pack 40 or other electrical devices 80, thereby reducing the battery pack 40 or other electrical devices 80 from being affected by the liquid and causing a short circuit or failure. For example, when the housing 20 is used outdoors, rainwater can enter the housing 20 from the first opening 301. The rainwater entering the housing 20 can be blocked by the base 51 and converged to flow into the first channel 100.

[0143] In some possible implementations, see Figure 5 and Figure 8 As shown, the housing 20 includes a plurality of second openings 203 disposed on the first wall 201. Along the first direction X, the second openings 203 penetrate the first wall 201. The first channel 100 is connected to the second openings 203. Along the second direction Y, the second openings 203 are closer to the bottom 21 of the housing 20 than the guide portion 52.

[0144] In some achievable embodiments, the direction opposite to the second direction Y is the direction of gravity. After the liquid outside the housing 20 enters the housing 20 from the first opening 301, the liquid can be blocked by the base 51, and the liquid can flow toward the bottom 21 in the first channel 100. The liquid flowing to the second opening 203 can be discharged from the housing 20 through the second opening 203, reducing the retention of liquid in the first channel 100, diverting the opening, and improving the safety of the energy storage device 10.

[0145] In some examples, the first flow guide 50 includes a plurality of flow guide portions 52 . The second opening 203 is located on a side of all the flow guide portions 52 close to the bottom 21 .

[0146] In some possible implementations, see Figure 8 As shown, at least part of the second opening 203 and the base 51 are arranged opposite to each other. When viewed along the first direction X, part of the side wall 512 and part of the extension 513 are located in the same second opening 203. The liquid entering the base 51 can be discharged from the second opening 203, further reducing the possibility of liquid accumulation and overflow from the diversion opening 501, thereby improving the safety of the energy storage device 10.

[0147] For some examples, see Figure 6 As shown, the side wall 512 and the extension 513 form an obtuse angle K3. 120°≤K3≤175°. The side wall 512 of the base 51 is an inclined surface. When the liquid entering the base 51 flows onto the side wall 512, the liquid can flow along the side wall 512 to the second opening 203 under the action of its own gravity and be discharged from the second opening 203. The way that the side wall 512 and the extension 513 of the base 51 form an obtuse angle K3 is conducive to improving the liquid discharge efficiency.

[0148] In some possible implementations, see Figure 2 and Figure 5 As shown, the energy storage device 10 includes a partition plate 70 and an electrical device 80. The partition plate 70 and the electrical device 80 are both disposed in the housing 20. Along the second direction Y, the battery pack 40 is disposed above the partition plate 70. The electrical device 80 is disposed below the partition plate 70.

[0149] The partition plate 70 can separate the internal space of the housing 20 into different spaces. The partition plate 70 can separate the battery pack 40 from the electrical device 80. When the battery pack 40 has thermal runaway, the partition plate 70 blocks high-pressure gas or high-temperature substances from entering the space where the electrical device 80 is located, which helps to reduce the possibility of damage to the electrical device 80 caused by the high-pressure gas or high-temperature substances, and improves the safety of the housing 20.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An energy storage device, characterized in that: include: The housing comprises a first wall and a second wall arranged opposite to each other along a first direction; an exhaust portion, disposed on the first wall; At least one battery pack is disposed in the housing, the battery pack comprising a pressure relief portion, and the pressure relief portion is disposed on a side of the battery pack close to the first wall; A first flow guide member, disposed in the housing, comprising a base and a flow guide portion connected to the base, the flow guide portion facing the pressure relief portion; a first channel, located between the base and the first wall, the base and the first wall serving as at least partial components forming the first channel, the flow guide being located in the first channel, and the exhaust portion being configured to discharge gas in the first channel out of the housing; The base includes a flow guide opening, the flow guide opening is communicated with the first channel, and the pressure relief portion is exposed in the flow guide opening; When viewed along the first direction, at least a portion of the flow guide portion is located within the flow guide opening.

2. The energy storage device according to claim 1, characterized in that: When viewed along the first direction, the flow guide portion covers the pressure relief portion.

3. The energy storage device according to claim 1 or 2, characterized in that: The guide portion includes an inclined portion connected to the base portion, and the inclined portion and the base portion form an obtuse angle.

4. The energy storage device according to claim 3, characterized in that: The guide portion includes a flat portion, the flat portion is connected to the inclined portion, the flat portion faces the guide opening, the flat portion and the first wall form a first gap, and the inclined portion and the first wall form a second gap.

5. The energy storage device according to claim 4, characterized in that: The housing comprises a bottom and a top arranged opposite to each other along a second direction, the first direction being perpendicular to the second direction; Along the second direction, the flat portion is closer to the exhaust portion than the inclined portion.

6. The energy storage device according to any one of claims 1 to 5, characterized in that: The base comprises a bottom wall, a side wall surrounding the bottom wall and an extension portion extending from the side wall. The flow guide opening is arranged on the bottom wall, and the flow guide portion is connected to the bottom wall.

7. The energy storage device according to claim 6, characterized in that: Along a direction opposite to the first direction, the guide portion is lower than the extending portion.

8. The energy storage device according to claim 6 or 7, characterized in that: The extension portion is sealingly connected to the first wall.

9. The energy storage device according to any one of claims 6 to 8, characterized in that: The housing comprises a bottom and a top arranged opposite to each other along a second direction; The exhaust portion includes a first opening penetrating through the first wall, the first opening is connected to the first channel, and along the second direction, the first opening is closer to the top than the guide portion; The exhaust portion faces the bottom wall.

10. The energy storage device according to any one of claims 1 to 9, characterized in that: The energy storage device comprises a second flow guide member in communication with the flow guide opening, and the second flow guide member is sealedly connected to the base; When viewed along the first direction, the second flow guide is disposed around the outside of the pressure relief portion, and the pressure relief portion is located inside the second flow guide; The battery pack includes a box body, the pressure relief portion is arranged in the box body, and the second flow guide is sealed and connected to the box body.

11. The energy storage device according to claim 10, characterized in that: One end of the second flow guide member abuts against the box body, and the other end of the second flow guide member abuts against the base.

12. The energy storage device according to claim 10 or 11, characterized in that: The second flow guide member is disposed around the flow guide opening.

13. The energy storage device according to any one of claims 1 to 12, characterized in that: The housing comprises a bottom and a top arranged opposite to each other along a second direction; The housing includes a plurality of second openings disposed on the first wall, the second openings penetrate the first wall, the first channel is communicated with the second openings, and along the second direction, the second openings are closer to the bottom than the guide portion.

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