Shell and electricity storage device

Abstract

The utility model discloses a shell, which comprises a shell part, a shell cover, a shell cover and a shell cover, a containing cavity is formed in the shell part, and the outer wall surface of the shell part is provided with an exhaust port communicated with the containing cavity; an exhaust channel is formed in the first pipe part, one end of the exhaust channel communicates with the exhaust port, and the other end communicates with the external space; the diaphragm covers the exhaust port; the multiple baffles are arranged in the exhaust channel at intervals in the length direction of the exhaust channel; on a projection plane perpendicular to the length direction of the exhaust channel, the orthographic projection of the multiple baffles covers the orthographic projection of the exhaust port, and the orthographic projection of each baffle covers a part of the exhaust port. The beneficial effects of the utility model are that the plurality of baffle plates smaller than the exhaust port are arranged in the exhaust pipe, so that the plurality of baffle plates can not only resist water or water vapor rushing into the housing from the outside; and meanwhile, outward exhaust of the exhaust port is not influenced, and the use safety of the electricity storage device is further ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery cell, specifically, relate to a shell and power storage device. BACKGROUND

[0002] The battery cell will produce gas in the circulation process, in order to ensure the safety in the use process of power storage device, will set up the exhaust port on its shell, the gas in the power storage device is promptly excluded, avoids the security accident due to gas accumulation expansion. But because the exhaust port is communicated with the outside, often will cause the moisture in the external environment to enter the inside of power storage device.

[0003] Especially the secondary battery used in new energy automobile, it is placed on the automobile chassis, often there is the situation that the sewage on the road rushes into the shell inside, causes the security risk. UTILITY MODEL CONTENTS

[0004] In order to solve the above problems, the utility model provides a shell and power storage device.

[0005] Firstly, the utility model provides a shell, the shell includes:

[0006] Shell portion, the inside is formed with the cavity, the outer wall surface of the shell body is equipped with the exhaust port communicated with the cavity;

[0007] First pipe portion, the inside is formed with the exhaust passage, one end of the exhaust passage is communicated with the exhaust port, the other end is communicated with the outside space;

[0008] Diaphragm, covers the exhaust port, and

[0009] Multiple baffles, the multiple baffles are arranged in the exhaust passage along the length direction of the exhaust passage, in the projection plane perpendicular to the length direction of the exhaust passage, the multiple baffles cover the exhaust port, and the projection of each baffle covers a part of the exhaust port.

[0010] As one embodiment of the utility model, the baffle close to the exhaust port is provided with a puncture part towards one side of the exhaust port.

[0011] As one embodiment of the utility model, the projection of any two baffles on the plane where the exhaust port is located does not overlap each other.

[0012] As one embodiment of the utility model, the multiple baffles include first plate body and second plate body, the first plate body is located at one end of the exhaust passage away from the exhaust port, and the puncture part is arranged on the second plate body.

[0013] As an embodiment of the present application, the first plate body is located above the second plate body in the direction of gravity.

[0014] As an embodiment of the present application, the plurality of baffles comprises a third plate body and a fourth plate body, the third plate body comprises two first fan-shaped portions arranged diagonally, and the fourth plate body comprises two second fan-shaped portions arranged diagonally.

[0015] As an embodiment of the present application, the third plate body is located at one end of the exhaust passage away from the exhaust port, and the area of the third plate body is greater than the area of the fourth plate body.

[0016] As an embodiment of the present application, the second tube portion is further connected to the outer wall surface of the shell portion, the second tube portion is sleeved on the outside of the first tube portion, a gap A exists between the outer side wall of the first tube portion and the inner side wall of the second tube portion, and the gap A satisfies 5mm≥A≥1.2mm.

[0017] As an embodiment of the present application, a plurality of water baffle strips are arranged on the inner wall of the second tube portion, the plurality of water baffle strips are arranged uniformly around the second tube portion, and the plurality of water baffle strips are located on the side of the plurality of baffles away from the exhaust port.

[0018] In a second aspect, the present application further provides a power storage device, which comprises a plurality of battery cells and the above-mentioned shell, and the plurality of battery cells are accommodated in the shell.

[0019] The present application has the following beneficial effects: by arranging a plurality of baffles smaller than the exhaust port in the exhaust pipe, the projections of the plurality of baffles in the exhaust passage cover the exhaust port, and the plurality of baffles are located at different positions in the exhaust passage; the external space is connected to the exhaust port, the gas at the exhaust port can flow normally, the plurality of baffles can jointly block the water vapor or impurities from the outside into the cavity, and the safety of the power storage device is further ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0021] Figure 1 The structural schematic diagram of the shell according to the embodiments of the present application;

[0022] Figure 2 The structural schematic diagram of the shell according to the embodiments of the present application;Figure 1 a transverse sectional view of

[0023] Figure 3 a longitudinal sectional view of Figure 1

[0024] Figure 4 a front view of Figure 1

[0025] Figure 5 a C-C sectional view of Figure 4

[0026] Figure 6 a left view of Figure 1

[0027] Figure 7 is an enlarged view of an exemplary baffle plate of the present application;

[0028] Figure 8 is an enlarged view of another exemplary baffle plate of the present application.

[0029] In the drawings,

[0030] 10, shell part; 20, tube part; 21, first tube part; 211, baffle plate; 2111, puncture part; 22, second tube part; 221, water blocking strip. DETAILED DESCRIPTION

[0031] It is known that, during the circulation process, gas is generated along with the chemical reaction between active material and electrolyte, and the pressure inside the power storage device increases. In order to ensure the safety of the power storage device during the circulation process, an exhaust port is arranged on the shell of the power storage device in the related art, so that the gas generated during the circulation process of the power storage device is discharged in time, and the risk of explosion caused by excessive gas pressure in the power storage device is avoided.

[0032] However, although the exhaust port can realize the timely discharge of the gas in the power storage device, and maintain the gas pressure in the power storage device within a safe range, water vapor in the external environment can also enter the power storage device through the exhaust port. When the water vapor accumulates to a certain amount in the power storage device, the risk of short circuit in the power storage device is caused.

[0033] ​​​​As an attempt to solve the above problems, in the related art, a waterproof and breathable film is arranged on the exhaust port, so that not only the gas in the circulation process of the battery cell can be discharged in time, and the air pressure in the shell is maintained within a safe range, but also the external water vapor and the like can be blocked from entering the inside of the power storage device. The inventors have found that in some use scenarios, the waterproof and breathable film can have good use effect; but in some use scenarios, the use of the waterproof and breathable film cannot achieve some expected use effect. For example, when the power storage device is used on a new energy vehicle, the power storage device is usually installed on the chassis of the vehicle, and when there is sewage on the driving surface, a large amount of sewage will flow into the exhaust passage. The waterproof and breathable film will be damaged due to a large impact force, causing the sewage to enter the inside of the power storage device from the exhaust port, affecting the normal use of the power storage device.

[0034] In order to solve the above problems existing in the related art, the utility model provides a kind of shell and the power storage device with the shell described above.The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0035] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, in the description of the present application, the terms used are only for the purpose of illustration, and are not intended to limit the scope of the present application. The terms "include" and / or "contain" are used to specify the presence of the elements, steps, operations and / or components, but do not exclude the presence or addition of one or more other elements, steps, operations and / or components. The terms "first", "second" and the like can be used to describe various elements, which do not represent the order and do not limit the elements. In addition, in the description of the present application, unless otherwise stated, the meaning of "multiple" is two and more than two. These terms are only used to distinguish one element from another. These and / or other aspects become apparent from the following drawings, and the skilled person can more easily understand the description of the embodiments described in the present application. The drawings are used to depict the embodiments described in the present application for illustrative purposes. The skilled person will easily realize from the following description that alternative embodiments of the structures and methods shown in the present application can be used without departing from the principles of the present application.

[0037] The shell of the present application comprises a shell, a tube, a diaphragm and a plurality of baffles, wherein:

[0038] The shell 10 is provided with a cavity and an exhaust port; the tube 20 comprises a first tube 21 and a second tube 22, the second tube 22 being sleeved on the outside of the first tube 21; the first tube 21 is provided with an exhaust passage, the diaphragm covers the exhaust port, thereby separating the cavity and the exhaust passage; a plurality of baffles 211 are arranged in the exhaust passage in the length direction of the exhaust passage; in the projection plane perpendicular to the length direction of the exhaust passage, the orthographic projection of the plurality of baffles 211 covers the orthographic projection of the exhaust port, and the orthographic projection of each baffle 211 covers a part of the exhaust port.

[0039] Referring to Figures 1-3 The shell of the present application comprises a shell, a tube, a diaphragm and a plurality of baffles, wherein: The shell 10 is provided with a cavity and an exhaust port; the tube 20 comprises a first tube 21 and a second tube 22, the second tube 22 being sleeved on the outside of the first tube 21; the first tube 21 is provided with an exhaust passage, the diaphragm covers the exhaust port, thereby separating the cavity and the exhaust passage; a plurality of baffles 211 are arranged in the exhaust passage in the length direction of the exhaust passage; in the projection plane perpendicular to the length direction of the exhaust passage, the orthographic projection of the plurality of baffles 211 covers the orthographic projection of the exhaust port, and the orthographic projection of each baffle 211 covers a part of the exhaust port.

[0040] It can be understood that one end of the inner tube is communicated with the cavity of the lower shell through the exhaust port, and the other end of the inner tube extends to the outside of the lower shell, so that the space defined by the inner tube forms an exhaust passage. The diaphragm covers the exhaust port and separates the cavity of the lower shell and the exhaust passage. The diaphragm is, for example, a waterproof and breathable film such as polytetrafluoroethylene. The gas and heat generated by the battery during the circulation process pass through the diaphragm on the exhaust port and are discharged to the outside of the shell under the guidance of the exhaust passage, so that the gas pressure and heat inside the power storage device are maintained within a safe range.

[0041] Continuing to refer to Figures 1-3 In the exhaust passage formed by the inner tube, a plurality of baffles 211 are arranged at intervals along the length direction of the exhaust passage. The orthographic projection of the plurality of baffles 211 on the projection plane perpendicular to the length direction covers the exhaust port, and the orthographic projection of each baffle 211 covers only a part of the exhaust port.

[0042] That is, the area of each baffle 211 in the plurality of baffles 211 is smaller than the area of the exhaust port, and the sum of the areas of the plurality of baffles 211 is greater than or equal to the area of the exhaust port.

[0043] Preferably, the sum of the areas of the plurality of baffles 211 can be slightly greater than the area of the exhaust port; more preferably, the sum of the areas of the plurality of baffles 211 is equal to the area of the exhaust port. In this way, the plurality of baffles 211 located in the exhaust passage not only effectively block the water or water vapor flowing into the inner tube from the outside, avoiding the diaphragm being damaged due to a large impact force; at the same time, the area of each baffle 211 is smaller than the area of the exhaust port, and there is a gap between any two adjacent baffles 211, so that the gas or heat in the shell cannot be discharged from the exhaust passage.

[0044] For example, the plurality of baffles 211 are not only arranged at different positions in the length direction of the exhaust passage, but also are arranged in a staggered manner in the circumferential direction of the exhaust passage. Thus, it can be ensured that the sum of the areas of the plurality of baffles 211 is sufficient to cover the exhaust port, that is, the plurality of baffles 211 can effectively block the water or water vapor flowing into the exhaust passage, and the diaphragm will not be damaged due to a large impact force of the water vapor; in addition, it can also be ensured that there is a gap between the plurality of baffles 211 for the gas to pass through. The use limitation of the waterproof and breathable film in a specific use scenario is effectively solved.

[0045] It should be noted that the two ends of the exhaust passage, i.e. the two tube openings of the inner tube, also belong to the part of the exhaust passage. That is, the baffles 211 can also be arranged at the ends of the exhaust passage, for example, the baffles 211 can be arranged at one end of the exhaust passage away from the shell part 10.

[0046] Optionally, the number of baffles 211 can be 2, 3, 4 or 5, etc., which can be determined according to the length and pipe diameter of the exhaust passage, and the like, and the number of baffles 211 is not limited in the present application. In addition, the pipe portion 20 and the shell portion 10 can also be a split structure, and the pipe portion 20 and the shell portion 10 are connected by a suitable connecting member, which is not limited in the present application.

[0047] In an optional embodiment, the baffle 211 near the exhaust port is provided with a puncture portion 2111 on the side facing the exhaust port.

[0048] Referring to Figures 3-5 , still taking the shell of the battery cell as an example: the puncture portion 2111 is arranged on the baffle 211 near the exhaust port, and the puncture portion 2111 is located on the surface of the side of the baffle 211 facing the exhaust port. Thus, when the battery cell in the cavity has problems such as overheating and gas production, causing the internal gas pressure of the shell to rise sharply. The diaphragm is affected by the high internal gas pressure of the shell and expands, and the diaphragm will come into contact with the puncture portion 2111. As the diaphragm continues to expand, the puncture portion 2111 will pierce the diaphragm, causing the internal gas pressure of the shell to drop rapidly, thereby avoiding the occurrence of thermal runaway accidents. At the same time, by arranging the puncture portion 2111 on the baffle 211, it is not necessary to use an additional puncture portion 2111 fixing structure, which to some extent reduces the mass and volume of the shell, and in the first place is conducive to improving the energy density.

[0049] Specifically, the puncture portion 2111 can be a sharp structure similar to a needle, so that it can timely and effectively pierce the expanded diaphragm. As can be easily understood, the puncture portion 2111 includes a sharp end and a non-sharp end. The puncture portion 2111 is fixed to the baffle 211 near the exhaust port through the non-sharp end, and the sharp end faces the diaphragm. Preferably, the sharp end or needle tip of the puncture portion 2111 is aligned with the center position of the diaphragm, so that when the diaphragm expands, the puncture portion 2111 can pierce the diaphragm at the position where the diaphragm deforms the most, and it is easier to pierce the diaphragm, so as to quickly reduce the internal gas pressure of the shell.

[0050] Optionally, the puncture portion 2111 can be integrally formed with the baffle 211 near the exhaust port, so as to improve the stability between the puncture portion 2111 and the baffle 211. The puncture portion 2111 and the baffle 211 near the exhaust port can also adopt a split structure, and the puncture portion 2111 is fixed to the baffle 211 by a suitable fixing method. In use, the fixing method between the puncture portion 2111 and the baffle 211 can be determined according to the material and size of the baffle 211, and the like, which is not limited in the present application.

[0051] In one optional implementation, the orthographic projections of any two baffles 211 onto the plane of the exhaust port do not overlap, meaning the sum of the areas of the baffles 211 is equal to the area of ​​the exhaust port. Furthermore, the baffles 211 are staggered circumferentially in the exhaust channel, meaning there is no overlap between any two baffles 211 in the circumferential direction of the exhaust channel. This not only effectively blocks external water vapor from entering the exhaust channel, but also prevents additional resistance to gas discharge from the casing due to overlapping portions between the baffles 211, and can also reduce the mass of the casing to some extent.

[0052] Preferably, the plurality of baffles 211 include a first plate and a second plate, both of which are semi-circular. The first plate is located at the end of the exhaust channel away from the exhaust port; and in the direction of gravity, the first plate is located above the second plate.

[0053] like Figures 6-7 As shown, a semi-circular first plate and a second plate are spaced apart along the length of the exhaust channel. The end of the exhaust channel near the exhaust port is, for example, its air inlet, and the end away from the exhaust port is, for example, its air outlet. The first plate is positioned, for example, at the air outlet of the exhaust channel, thus immediately blocking external water vapor and minimizing its entry into the exhaust channel. Simultaneously, in the direction of gravity, the first plate is positioned higher than the second plate. That is, both the semi-circular first and second plates are connected to the inner wall of the first pipe section 21 through their curved edges, and the diameters of both the first and second plates are parallel to the horizontal plane within the exhaust channel. Therefore, even if some water vapor "escapes" from the first plate into the exhaust channel, it will be blocked by the second plate, ensuring that the water vapor remains on the side of the second plate away from the exhaust port. Consequently, the water vapor flows under external force, and the first plate, positioned above the second plate, does not obstruct this flow. Ultimately, this portion of water vapor gradually flows out of the exhaust channel, preventing water vapor accumulation within the exhaust channel.

[0054] The second plate is positioned, for example, near the air inlet of the exhaust channel, and the puncture part 2111 is located on the side of the second plate facing the exhaust port. It is understood that a certain gap needs to be maintained between the second plate and the exhaust port to provide sufficient expansion space for the diaphragm. For example, when the diaphragm expands within a safe pressure range, the puncture part 2111 will not contact the diaphragm; or, even if the puncture part 2111 contacts the diaphragm, it will not puncture the diaphragm and cause it to fail. The size of this gap can be determined comprehensively based on the safe pressure value of the outer casing and the deformation properties of the diaphragm itself, as long as it ensures that the diaphragm can be punctured in time in the event of thermal runaway of the outer casing; this application does not impose specific limitations on it.

[0055] Alternatively, the plurality of baffles 211 includes a third plate body and a fourth plate body, the third plate body includes two first sector-shaped portions arranged diagonally, and the fourth plate body includes two second sector-shaped portions arranged diagonally; and the third plate body is located at an end of the exhaust passage away from the exhaust port, and the area of the third plate body is greater than the area of the fourth plate body.

[0056] As shown in FIG. 1, the third plate body and the fourth plate body are arranged in the exhaust passage along the length direction of the exhaust passage. Figure 8 As shown in FIG. 1, the third plate body and the fourth plate body are arranged in the exhaust passage along the length direction of the exhaust passage. Figure 4 As shown in FIG. 1, the third plate body and the fourth plate body are arranged in the exhaust passage along the length direction of the exhaust passage.

[0057] The end of the exhaust passage close to the exhaust port is, for example, the air inlet thereof, and the end of the exhaust passage away from the exhaust port is, for example, the air outlet thereof. The third plate body is located at the position of the air outlet of the exhaust passage, and the water vapor from the outside is first blocked by the third plate body. Preferably, the area of the third plate body can be greater than the area of the fourth plate body, that is, the sum of the areas of the sector-shaped plate I and the sector-shaped plate II is greater than the sum of the areas of the sector-shaped plate III and the sector-shaped plate IV. Thus, the third plate body can block as much water vapor as possible from the outside to prevent the water vapor from entering the exhaust passage. Alternatively, the areas of the sector-shaped plate I and the sector-shaped plate II in the third plate body can be the same or different, which can be selected according to the situation in use, and the present application does not make specific limitations thereto.

[0058] The fourth plate body is located at a position close to the air inlet of the exhaust passage, and the puncture portion 2111 is arranged on the surface of the fourth plate body facing the exhaust port. It is easy to understand that there is a certain gap between the fourth plate body and the diaphragm to provide a certain deformation space for the expansion of the diaphragm. For example, when the diaphragm expands within the safe air pressure range, at this time, the puncture portion 2111 does not contact the diaphragm; or even if the puncture portion 2111 contacts the diaphragm, it does not pierce the diaphragm to make the diaphragm ineffective. The size of the gap can be determined comprehensively according to the safe air pressure value of the shell and the deformation performance of the diaphragm, etc., as long as the diaphragm can be pierced in time when the shell is in thermal runaway, and the present application does not make specific limitations thereto.

[0059] Preferably, the sector III and the sector IV in the fourth plate body are equal in area, i.e. the sector III and the sector IV are centrally symmetrical in the exhaust passage, the end of the puncture part 2111 away from the diaphragm is connected with the fourth plate body, and the end of the puncture part 2111 close to the diaphragm (the sharp end of the puncture part 2111) is opposite to the central position of the diaphragm. This can not only puncture the diaphragm at the position where the diaphragm deforms most, but also ensure that the puncture part 2111 is uniformly stressed, so that the puncture part 2111 will not be inclined due to uneven stress, and thus the puncture part 2111 cannot puncture the diaphragm in time and effectively.

[0060] An alternative embodiment further comprises a second tube part 22 connected to the shell part 10, the second tube part 22 is sleeved outside the first tube part 21, and a gap A exists between the outer wall of the first tube part 21 and the inner wall of the second tube part 22, and the gap A satisfies: 5mm≥A≥1.2mm.

[0061] Referring to Figure 1 The second tube part 22 is sleeved outside the first tube part 21. As described above, the space defined by the first tube part 21 forms an exhaust passage, and other heat and gas in the shell can be discharged to the outside under the guidance of the exhaust passage. However, due to the limitations of use scenarios, shell installation space, processing technology and other factors, it is often necessary to limit the length and size of the tube diameter of the first tube part 21. By providing the second tube part 22 outside the first tube part 21, a flexible pipe for guiding gas discharge can be sleeved outside the second tube part 22, which not only overcomes the limitations of the processing technology, but also increases the flow rate of gas discharge, which is beneficial to the rapid discharge of gas in the shell.

[0062] In addition, due to the surface tension of the liquid, if A is less than 1.2mm, it is not conducive to the flow of the liquid remaining in the gap A, and if A is greater than 5mm, it will cause a large amount of water vapor to accumulate in the gap A, affecting the electrical safety. Therefore, by setting the gap A in this range, the rapid flow and volatilization of water vapor can be ensured, and the safety of the power storage device can also be ensured.

[0063] Exemplarily, taking the start-stop battery pack as an example, a flexible hose can be connected to the second tube part 22, which can extend to the lower part of the automobile chassis, so as to guide the gas or heat in the shell to be discharged to the external environment. In addition, the radial size of the exhaust passage formed by the flexible hose is larger than the size of the exhaust passage formed by the first tube part 21, which also improves the speed of gas discharge in the shell to a certain extent.

[0064] Optionally, if the connection method between the first tube 21 and the shell 10 is the same, the second tube 22 and the shell 10 can be integrally formed or have a separate structure, and then connected to the shell 10 by a specific connector. This application uses the integral forming of the second tube 22 and the shell 10 as an example: the first tube 21, the second tube 22 and the shell 10 are, for example, integrally injection molded, and the materials of the three are, for example, a mixture of nylon and glass fiber.

[0065] like Figure 1 As shown, there is a gap A between the outer wall of the first pipe section 21 and the inner wall of the second pipe section 22. The size of the gap A is, for example, the radial distance between the outer wall of the first pipe section and the inner wall of the second pipe section in the exhaust channel. The value of A ranges from, for example, 1.2 mm to 5 mm. When A is greater than or equal to 1.2 mm, a buffer space can be formed between the first pipe section 21 and the second pipe section 22 to block water vapor from entering. At the same time, when A is less than or equal to 5 mm, while maintaining a certain buffer space between the first pipe section 21 and the second pipe section 22, the radial dimension of the first pipe section 21 can be relatively small and the radial dimension of the second pipe section 22 can be relatively large. The first pipe section 21 can effectively prevent water vapor from entering, and the second pipe section 22 can quickly discharge gas or heat from the shell section 10.

[0066] Preferably, the value range of A is, for example, 1.5-4.5mm, 1.8-3.6mm, 2.0-3.5mm, 2.2-3.0mm, or 2.5-2.8mm. In addition to the aforementioned effects, a gap A within the above range ensures that, during injection molding, the wall thickness of the first tube 21 and the second tube 22 can be made sufficiently small while still meeting strength requirements. Furthermore, it prevents the radial dimension of the first tube 21 from being too small, affecting gas discharge from the shell 10, while also preventing the radial dimension of the second tube 22 from being too large, resulting in an excessively large external flexible hose.

[0067] Optionally, the gap A between the outer wall of the first tube 21 and the inner wall of the second tube 22 can be 1.6 mm, 2.1 mm, 2.6 mm, 3.1 mm, 3.2 mm, 3.8 mm, 4.0 mm, or 4.2 mm, etc. The value of A can be determined according to the adaptability of the size of the shell 10 during use; this application does not impose a specific limitation on it.

[0068] In one optional embodiment, a plurality of water-blocking strips 221 are provided on the inner wall of the second pipe section 22, and the plurality of water-blocking strips 221 are evenly arranged around the second pipe section 22; the plurality of water-blocking strips 221 are located on the side of the plurality of baffles 211 away from the exhaust port.

[0069] SeeFigures 2-3 and Figure 7 or Figure 8 The length of the second tube portion 22 is greater than that of the first tube portion 21, i.e. the second tube portion 22 extends further outside the shell than the first tube portion 21, and the second tube portion 22 is the first to be contacted by the external water vapor when the water vapor rushes in. For example, a plurality of water blocking strips 221 can be arranged around the inner wall of the portion of the second tube portion 22 that extends beyond the first tube portion 21. When the amount of water vapor that rushes in is small, the plurality of water blocking strips 221 can block the portion of the water vapor and prevent the portion of the water vapor from entering the exhaust passage. The water blocking strips 221 are, for example, protrusions or ribs protruding from the inner wall of the second tube portion 22. The number of the water blocking strips 221 can be, for example, 2, 3, or 4, and can be determined according to the length of the first tube portion 21 and the second tube portion 22, or the use environment of the shell, and the like, which are not limited in the present application.

[0070] The power storage device described in the embodiment includes a plurality of battery cells and the shell as described above. The plurality of battery cells are accommodated in the shell, and the tabs of the plurality of battery cells are arranged toward the exhaust port. The power storage device can be, for example, a power storage device capable of repeated charging and discharging, and can be, for example, a start-stop battery pack, an energy storage battery pack, or a power battery pack. The power storage device further includes an upper shell that is provided on the shell and is in a sealed connection with the shell to encapsulate the plurality of battery cells in a cavity formed by the upper shell and the shell.

[0071] The battery cell can be interpreted as a concept of a secondary battery. The battery cell described in the present application can include a lithium ion secondary battery, a sodium ion secondary battery, a nickel-hydrogen battery, and the like.

[0072] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order to not obscure the understanding of this description.

[0073] Also, it is understood that the features of the different embodiments can be combined with each other, as the skilled person will appreciate that the combination of features of different embodiments means within the scope of the application and forms different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0074] Those skilled in the art will appreciate that, although the present application has been described in relation to the exemplary embodiments, various modifications can be made without departing from the scope of the application and that equivalent elements can be substituted for those elements illustrated and described herein. In addition, a number of modifications can be made to adapt a particular situation or material to the teachings of the application without departing from the central scope thereof. Therefore, the present application is not limited to the particular embodiments disclosed, but includes all embodiments falling within the scope of the appended claims.

Claims

1. A housing, characterized in that, The shell portion has an outer wall surface provided with an exhaust port communicating with the accommodation cavity. The first tube portion has an exhaust passage formed therein, one end of the exhaust passage communicating with the exhaust port and the other end communicating with an external space. The diaphragm covers the exhaust port. A plurality of baffles are arranged in the exhaust passage at intervals along the length direction of the exhaust passage. The plurality of baffles cover the exhaust port in a plan view perpendicular to the length direction of the exhaust passage, and the plan view of each baffle covers a portion of the exhaust port. The baffle close to the exhaust port is provided with a puncture portion on the side facing the exhaust port. The plan view of any two baffles on the plane where the exhaust port is located does not overlap.

2. The housing of claim 1, wherein The plurality of baffles include a first plate body and a second plate body, both of which are semicircular, the first plate body is located at one end of the exhaust passage away from the exhaust port, and the puncture portion is provided on the second plate body.

3. The housing of claim 1, wherein In the direction of gravity, the first plate body is located above the second plate body.

4. The housing of claim 2, wherein The plurality of baffles include a third plate body and a fourth plate body, the third plate body includes two first fan-shaped portions arranged diagonally, and the fourth plate body includes two second fan-shaped portions arranged diagonally.

5. The housing of claim 4, wherein, The third plate body is located at one end of the exhaust passage away from the exhaust port, and the area of the third plate body is greater than that of the fourth plate body.

6. The enclosure of claim 2, wherein, Further comprising a second tube portion connected to the outer wall surface of the shell portion, the second tube portion is sleeved on the outside of the first tube portion, there is a gap A between the outer wall of the first tube portion and the inner wall of the second tube portion, and the gap A satisfies: 5mm≥A≥1.2mm.

7. The housing of claim 6, wherein The inner wall of the second tube portion is provided with a plurality of water retaining strips, the plurality of water retaining strips are arranged uniformly around the second tube portion; the plurality of water retaining strips are located on the side of the plurality of baffles away from the exhaust port.

8. The enclosure of claim 1, wherein, The plurality of electric cores and the shell as claimed in any one of claims 1-9 are included.

9. The housing of claim 8, wherein, The plurality of electric cores are accommodated in the shell.

10. An electrical energy storage device, characterized by ​ ​

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