Battery cells, batteries and electrical devices

Abstract

The present application discloses a battery cell, a battery, and an electric device, in which the battery cell includes an outer casing, an electrode assembly, and an exhaust structure, the outer casing having an internal cavity and a first wall, the electrode assembly disposed in the internal cavity, the exhaust structure disposed between the first wall and the electrode assembly, and a fluid passage disposed in the exhaust structure. In an example of the present application, by disposing the exhaust structure in the internal cavity and attaching the exhaust structure between the electrode assembly and the first wall of the outer casing, the fluid passage in the exhaust structure can be used as a passage for airflow, reducing the obstruction of airflow caused by the exhaust structure disposed between the first wall and the electrode assembly, thereby allowing airflow to flow to a predetermined position through the fluid passage, improving the reliability of the battery cell.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese Patent Application No. 202310341097.1, entitled "Battery Cell, Battery and Electrical Device," filed on March 31, 2023, the entire contents of which are incorporated herein by reference. [Technical Field]

[0002] This application relates to the field of batteries, and more particularly to battery cells, batteries and electrical devices. [Background technology]

[0003] Batteries are widely used in various fields of production and daily life. A battery includes a battery cell with an outer casing and a pressure release mechanism installed in the outer casing. If the battery cell experiences thermal runaway, the pressure release mechanism will open. Improving the timeliness of the pressure release mechanism opening is very important for the reliability of the battery cell. Summary of the Invention [Problem to be solved by the invention]

[0004] The main object of the present application is to propose a battery cell for improving the airflow flow performance within the battery cell and thereby improving the reliability of the battery cell. [Means for solving the problem]

[0005] In order to achieve the above object, the battery cell proposed by the present application comprises: an outer casing having an interior cavity and a first wall; an electrode assembly disposed in the internal cavity; and an exhaust structure disposed between the first wall and the electrode assembly, the exhaust structure having a fluid passageway therethrough.

[0006] In the example of the present application, an exhaust structure is installed in the internal cavity, the exhaust structure is attached between the electrode assembly and the first wall of the outer casing, and the fluid passage on the exhaust structure is used as a passage for airflow, thereby reducing the obstruction of airflow caused by the exhaust structure provided between the first wall and the electrode assembly, and thereby allowing airflow to flow to a predetermined position through the fluid passage, improving the reliability of the battery cell.

[0007] In some examples, the fluid passage communicates with an edge of the exhaust structure in a first direction, the first direction intersecting a thickness direction of the first wall.

[0008] In this example, the first direction intersects with the thickness direction of the first wall, and by connecting the fluid passage to the edge of the exhaust structure in the first direction, the airflow outside the edge of the exhaust structure in the first direction can enter the fluid passage and flow to a predetermined position.

[0009] In some examples, the exterior casing includes a second wall, a first gap is formed between the outer circumferential surface of the electrode assembly and the second wall, and the fluid passage communicates with the first gap.

[0010] In this example, the fluid passage communicates with the first gap formed between the outer circumferential surface of the electrode assembly and the second wall, and the fluid passage can be used as a passage that connects the first gap to a predetermined position. This allows airflow in the first gap to flow to the predetermined position, further increasing the flow of air between the outer circumferential surface of the electrode assembly and different positions inside the battery cell. This can also improve the reliability of the battery cell, and furthermore, it can guide and disperse heat from the outer circumferential surface of the electrode assembly to a predetermined position inside the battery cell, reducing the problem of local overheating of the outer circumferential surface of the electrode assembly.

[0011] In some examples, a second gap is formed between the outer peripheral surface of the exhaust structure and a second wall of the outer casing, and the fluid passage communicates with the second gap.

[0012] The fluid passage in this example communicates with the second gap between the outer circumferential surface of the exhaust structure and the second wall, and the fluid passage can be used as a passage that connects the second gap to a predetermined position, thereby allowing the airflow in the second gap to flow to the predetermined position and increasing the flow of airflow between the outer circumferential surface of the exhaust structure and different positions inside the battery cell.

[0013] In some examples, the outer casing includes a second wall, a first gap is formed between the outer peripheral surface of the electrode assembly and the second wall, the fluid passage is in communication with the first gap, and a second gap is formed between the outer peripheral surface of the exhaust structure and the second wall of the outer casing, the fluid passage is in communication with the second gap.

[0014] In this example, the fluid passage communicates with the first gap and the second gap, which facilitates directing the airflow from the outer surface of the electrode assembly to a predetermined position in the battery cell, thereby improving the reliability of the battery cell. Also, directing the airflow from the outer surface of the exhaust structure to a predetermined position in the battery cell improves the fluidity of the airflow inside the battery cell and reduces the problem of local overheating inside the battery cell.

[0015] In some examples, the exhaust structure includes a plate body including a first surface disposed along a thickness of the plate body, the fluid passage being disposed on the first surface.

[0016] In this embodiment, the first surface is the surface in the thickness direction of the plate body, so the fluid passage is located on the first surface, which can increase the total area of ​​the fluid passage path, thereby providing more space for the airflow inside the battery cell and further improving the fluidity of the airflow.

[0017] In some examples, a support block is placed on the first surface and a fluid passageway is formed around the support block.

[0018] In this example, the support block allows the size of the fluid passage to be easily designed according to needs, and the support block also increases the overall thickness of the exhaust structure, further increasing the gap distance between the electrode assembly and the first wall and reducing the possibility of the electrode assembly contacting the first wall.

[0019] In some examples, a plurality of support blocks are disposed on the first surface, and fluid passages are formed between the plurality of support blocks.

[0020] In this embodiment, the installation of multiple support blocks can distribute the force acting on the first wall of the electrode assembly, which helps reduce deformation of the plate body due to stress concentration. In addition, the formation of fluid passages between the multiple support blocks allows full utilization of the space between the support blocks, improving the structural strength of the exhaust structure and facilitating the formation of the fluid passages.

[0021] In some examples, the plurality of support blocks comprises: A plurality of support blocks are arranged in an array; A plurality of support blocks are arranged along the width direction of the plate body; A plurality of support blocks are arranged along the length of the plate body; The support block satisfies at least one of the following conditions: that it is a rectangular block or a cylinder.

[0022] In this example, when a plurality of support blocks are arranged in an array, it is helpful to simplify the molding die for the plurality of support blocks, and it is possible to facilitate molding of the entire exhaust structure.

[0023] In this example, when multiple support blocks are arranged along the width or length of the plate body, the support blocks can be easily attached or shaped along the length or width of the plate body. When the support blocks are installed separately from the plate body, the shaping equipment for the support blocks and the plate body can be simplified. When the support blocks and the plate body are connected and fixed, the corresponding equipment can be controlled to move along a fixed path relative to each other, further simplifying the control of the processing equipment for the support blocks and the plate body. When the support blocks are installed integrally with the plate body, the shaping equipment can be simplified, thereby improving the production efficiency of the exhaust structure.

[0024] In this example, if the support block is rectangular or cylindrical, the support block can be easily formed, and the contact area between the support block and the external structure can be increased, thereby improving the stability of the exhaust structure.

[0025] In some examples, a through hole is provided in the plate body, the through hole penetrates the plate body along the thickness direction of the plate body, and the through hole communicates with the fluid passage.

[0026] In this example, the through holes are arranged to penetrate along the thickness direction of the plate body, so that the through holes are used to direct the airflow between the two surfaces in the thickness direction of the plate body, further guiding more airflow into the fluid passage, thereby improving the airflow performance.

[0027] In some examples, at least a portion of the through holes are interleaved with the support blocks.

[0028] In this example, by arranging at least some of the through holes alternately with the support blocks, when the support blocks come into contact with an external structure, the through holes are not blocked by the external structure, and the through holes can maintain a better penetration state.

[0029] In some examples, the support blocks have multiple rows, with through holes located between two adjacent rows of support blocks.

[0030] In this example, the use of multiple rows of support blocks can reduce the problem of stress concentration on the plate body and further reduce the possibility of deformation of the plate body. In addition, by installing through holes between two adjacent rows of support blocks, the through holes can communicate with the fluid passage between the adjacent support blocks, further improving the flow of air on the two surfaces in the thickness direction of the plate body.

[0031] In some examples, the first surface faces the first wall.

[0032] In this example, a support block is installed on the first surface, and the first surface is installed facing the first wall, thereby reducing the force acting on the electrode assembly by the support block and reducing the possibility of damage to the electrode assembly due to stress concentration. Also, by installing a fluid passage between the plate body and the first wall, the airflow can be more quickly guided to a predetermined position on the first wall.

[0033] In some examples, the battery cell further includes an insulating film wrapped around the outer periphery of the electrode assembly, the insulating film having a first communication hole, the exhaust structure being disposed between the insulating film and the first wall, and the exhaust structure having a second communication hole facing the first communication hole.

[0034] In this example, the insulating film is wrapped around the outer periphery of the electrode assembly and is used to provide insulation between the electrode assembly and the outer casing. In this example, a first communication hole is provided in the insulating film, a second communication hole is provided in the exhaust structure, and the first communication hole and the second communication hole are provided opposite each other, which makes it easy to position and install the insulating film and the exhaust structure.

[0035] In some examples, the second communication hole is located in the support block.

[0036] In this example, the second communication hole can be easily blocked by placing the second communication hole in the support block.

[0037] In some examples, the support block is a hollow structure that protrudes opposite to the plate body, the second communication hole is located in a bottom wall of the support block, and the bottom wall of the support block abuts against the first wall.

[0038] In this example, the support block has a hollow structure, which reduces the weight of the exhaust structure and improves the energy density of the battery cell. Furthermore, the bottom wall of the support block abuts against the first wall, which improves the stability of the exhaust structure within the battery cell. Furthermore, the second communication hole is located in the bottom wall of the support block, which makes it easy to block the second communication hole when the support block abuts against the first wall.

[0039] In some examples, the battery cell further includes an insulating sheet including a first portion, at least a portion of which is located on one side of the exhaust structure away from the electrode assembly and covers the second communication hole.

[0040] In this example, at least a portion of the insulating sheet shields the second communication hole, thereby reducing the probability that powder of the electrode assembly passes through the second communication hole.

[0041] In some examples, the first portion is sealed to the opening of the second communication hole.

[0042] In this example, the first portion of the insulating sheet is in close contact with the opening of the second communicating hole, thereby sealing the opening of the second communicating hole and preventing powder from passing through the second communicating hole.

[0043] In some examples, there is a predetermined distance in the width direction of the plate body between the first portion and at least one edge in the width direction of the plate body.

[0044] In this example, by providing a predetermined distance between the first portion of the insulating sheet and the edge of the plate body, the blockage of the fluid passage at the edge of the plate body of the insulating sheet is reduced, improving the airflow performance.

[0045] In some examples, there is a preset distance between the support block and at least one edge of the plate body in the width direction.

[0046] In this example, by providing a predetermined distance between the support block and the edge of the plate body in the width direction, the edge position of the plate body in the width direction has a fluid passage, so that the exhaust structure has better exhaust performance.

[0047] In some examples, there is a predetermined distance between the support block and at least one edge of the plate body in the width direction, and there is a predetermined distance between the first portion and at least one edge of the plate body in the width direction.

[0048] In this example, the support block insulating sheet and the support block are both spaced a predetermined distance from the widthwise edge of the plate body, so that the support block and the insulating sheet do not completely block the fluid passage at the widthwise edge of the plate body, thereby providing better exhaust performance to the exhaust structure.

[0049] In some examples, the insulating film is folded and wrapped around the electrode assembly, forming a first folded edge and a second folded edge that overlap each other on the sides of the electrode assembly, and the insulating sheet further includes a second portion connected to the first portion, and the second portion secures the first folded edge and the second folded edge.

[0050] In this example, the insulating film is folded and wrapped around the electrode assembly, providing insulating protection for the outer surface of the electrode assembly. By forming first and second overlapping folds of the insulating film, the insulating sheet is wrapped around the side edges of the electrode assembly, reducing the possibility of the electrode assembly coming into contact with the outer casing. By securing the first and second folds, the insulating sheet can be used to secure the insulating film. Furthermore, because the insulating sheet is connected to the side of the exhaust structure that faces away from the electrode assembly, the insulating sheet can be used to connect the insulating film and the exhaust structure to each other, improving the stability of the exhaust structure inside the battery cell.

[0051] In some examples, the support block is installed separately from the plate body, and the second communication hole passes through the support block and the plate body.

[0052] In this example, the second through-holes penetrate the support block and the plate body. The second through-holes position the support block and the plate body, facilitating connection between the support block and the plate body. The second through-holes also position the support block, the plate body, and the insulating film, facilitating connection between these three.

[0053] In some examples, the support block is installed separately from the plate body, and the plate body is connected to the insulating film.

[0054] In this embodiment, by connecting the plate body to the insulating film, the exhaust structure can be connected and fixed to the insulating film, which can improve the stability of the plate body.

[0055] In some examples, the support block is installed separately from the plate body, and the support block, the plate body, and the insulating film are connected together.

[0056] In this example, the support block is connected to the plate body, and the plate body is connected to the insulating film, so that the support block, the plate body, and the insulating film can form an overall structure, which further improves the stability of the internal structure of the battery cell and reduces the possibility of the internal structure of the battery cell shifting.

[0057] In some examples, the center of the second communication hole is located on one side of the centerline in the longitudinal direction of the plate body.

[0058] In this example, the center of the second communicating hole does not overlap with the center line of the plate body in the longitudinal direction, so the second communicating hole is installed eccentrically with respect to the center line of the plate body in the longitudinal direction, making it easier to position and recognize when installing the exhaust structure and reducing the possibility of incorrect installation.

[0059] In some examples, the center of the second communication hole is located on one side of the centerline in the width direction of the plate body.

[0060] In this example, the center of the second communicating hole does not overlap with the center line of the plate body in the width direction, so the second through hole is installed eccentrically with respect to the center line of the plate body in the width direction, making it easier to position and recognize when installing the exhaust structure and reducing the possibility of incorrect installation.

[0061] In some examples, the exhaust structure includes a plurality of second communication holes, the plurality of second communication holes being located on either side of a center line in the longitudinal direction of the plate body, and the plurality of second communication holes being asymmetric with respect to the center line in the longitudinal direction of the plate body.

[0062] In this example, second communication holes are provided on both sides of the center line in the longitudinal direction of the plate body, and the second communication holes on both sides in the longitudinal direction of the plate body are provided asymmetrically with respect to the center line in the longitudinal direction of the plate body, making it easier to recognize the exhaust structure by the second communication holes when installing the exhaust structure and reducing the possibility of incorrect installation.

[0063] In some examples, the exhaust structure includes a plurality of second communication holes, the plurality of second communication holes being located on either side of a center line in the width direction of the plate body, and the plurality of second communication holes being asymmetric with respect to the center line in the width direction of the plate body.

[0064] In this example, second communication holes are provided on both sides of the center line in the width direction of the plate body, and the second communication holes on both sides in the width direction of the plate body are provided asymmetrically with respect to the center line in the width direction of the plate body, making it easier to recognize the exhaust structure by the second communication holes when installing the exhaust structure and reducing the possibility of incorrect installation.

[0065] In some examples, the exhaust structure includes a plurality of support blocks, each of which has a second communication hole disposed therein.

[0066] In this example, by providing second communication holes in each of the multiple support blocks, it is possible to easily mold the support blocks as a single unit, simplify the molding equipment for the support blocks, and reduce the cost of molding the support blocks. It is also possible to reduce the risk of incorrect installation of different support blocks.

[0067] In some instances, the support block is mounted integrally with the plate body.

[0068] In this example, by integrating the support block with the plate body, it is possible to easily form the plate body and the support block, and improve the processing performance of the exhaust structure.

[0069] In some examples, the plate body includes a second surface facing the first surface along the thickness direction of the plate body, and a recess is formed in the second surface at a position facing the support block.

[0070] In this example, the second surface is installed opposite the first wall, and the recesses on the second surface are used to direct the airflow on one side of the second surface, which can further increase the airflow space and improve the airflow flow within the battery cell.

[0071] In some instances, the recess extends to the edge of the plate body.

[0072] The recesses in this example extend to the edge of the plate body, so that the airflow at the edge of the plate body can flow into the recesses.

[0073] In some examples, the support block includes a bottom wall that abuts against the first wall, and a side wall that has a first through hole that communicates with the recess.

[0074] In this example, the first through hole can be used to form a passage that penetrates the side wall of the support block, so that the airflow on one side of the second surface can flow along the first through hole to one side of the first surface, and the airflow on both sides of the plate body can flow directly along the first through hole, further improving the airflow circulation performance within the battery cell.

[0075] In some examples, a pressure relief mechanism is disposed in the first wall, and the first through-hole communicates with the recess and the pressure relief mechanism.

[0076] The pressure release mechanism in this example can be used to release pressure in a battery cell, and since the first through hole is connected to the recess and the pressure release mechanism, the airflow on one side of the second surface of the plate body can be easily guided to the pressure release mechanism, thereby improving the pressure release performance of the battery cell.

[0077] In some examples, the support blocks include edge support blocks mounted on edges of the plate body.

[0078] In this example, the edge support block structure is adopted, which can provide a support effect to the edge of the plate body, which helps to improve the structural strength of the edge portion of the plate body, thereby reducing deformation of the edge of the plate body.

[0079] In some examples, a recess is formed in the second surface at a location opposite the edge support block, and the recess extends along at least the edge of the plate body in the width direction.

[0080] In this example, by forming a recess at a position corresponding to the edge support block, the recess creates a space for airflow, further increasing the airflow space within the battery cell and improving the airflow performance within the battery cell.

[0081] In some examples, a second through-hole is provided in the edge support block, the second through-hole passing through the edge support block in a direction transverse to the thickness of the first wall.

[0082] In this example, the second through-holes communicate with the fluid passages, so that the airflow in the edge support block can be guided to the fluid passages, improving the fluidity of the airflow in the edge portion of the plate body.

[0083] In some examples, the second through-hole is located opposite the pressure relief mechanism.

[0084] In this example, the second through-hole is located opposite the pressure release mechanism, and after the airflow passes through the second through-hole, it can quickly reach the pressure release mechanism and open the pressure release mechanism in a timely manner.

[0085] In some examples, the support block is installed separately from the plate body, and the support block is fixed to the plate body.

[0086] In this example, the support block is installed separately from the plate body, so the support block and the plate body can be easily molded separately, thereby simplifying the molding equipment for the support block and the plate body. By fixing the support block to the plate body, the relative shift between the support block and the plate body can be reduced, thereby improving the structural stability of the exhaust structure.

[0087] In some examples, the edge of the support block and the edge of the plate body have a preset distance.

[0088] In this example, by providing a predetermined distance between the support block and the edge of the plate body, the support block can form a space for airflow on the outer surface of the support block without completely blocking the edge position in the longitudinal direction of the plate body, thereby improving the airflow circulation performance.

[0089] In some examples, there is a preset distance between the edge of the support block and the edge of the plate body in the width direction of the plate body.

[0090] In this example, by providing a predetermined distance between the support block and the edge of the plate body, the support block can form a space on the outer surface of the support block for airflow to flow without completely blocking the edge position in the width direction of the plate body, thereby improving the airflow circulation performance.

[0091] In some instances, the support blocks are hot melted to the plate body.

[0092] In this example, the hot melt connection facilitates quick connection between the support block and the plate body, and the welding marks formed by the hot melt connect and fix the support block and the plate body to each other, which helps to increase the connection area between the support block and the plate body and improve the connection strength between the support block and the plate body.

[0093] In some examples, multiple support blocks are installed, and multiple welds are formed on each support block and plate body.

[0094] In this example, by forming multiple weld marks, the connection points between the support block and the plate body can be relatively dispersed, thereby reducing the problem of the local temperature of the plate body becoming excessively high due to a single weld mark, and further reducing the problem of large-area penetration and melting of the plate body.

[0095] In some instances, the hot melt weld marks on the support blocks are exposed on the surface of the plate body away from the support blocks.

[0096] In this example, the welding marks are exposed on the surface of the plate body away from the support block, which makes it easy to melt and weld the plate body and the support block together, and the plate body is fixed to the plate body, increasing the contact area of ​​the welding between the support block and the plate body, thereby improving the structural strength of the plate body and the support block.

[0097] In some instances, the thickness of the plate body is less than the thickness of the support block.

[0098] In this example, the thickness of the plate body is smaller than that of the support block, thereby reducing the overall thickness of the exhaust structure, and since it is hot-melted to one side of the relatively thin plate body, the required equipment power is relatively low, thereby saving costs.

[0099] In some examples, the battery cell further includes a pressure relief mechanism disposed in the first wall, and the fluid passage is used to direct airflow in the internal cavity to the pressure relief mechanism.

[0100] The pressure release mechanism in this example is used to release the airflow inside the battery cell to the outside of the battery cell. The fluid passage allows the airflow inside the battery cell to pass through the exhaust structure and reach the pressure release mechanism, so that the pressure release mechanism can release the pressure in a timely manner, thereby improving the reliability of the battery cell.

[0101] In some examples, the exhaust structure includes a plate body and a support block, the support block is installed on one side of the plate body facing the first wall, a fluid passage is formed around the support block, and a projection of the support block on the first wall does not overlap with the pressure release mechanism.

[0102] In this example, by placing the support block on one side of the plate body facing the first wall, the support block can act on the first wall, and the plate body is used to support the electrode assembly, further reducing damage to the electrode assembly due to stress concentration. By forming a fluid passage around the support block, airflow can flow along the fluid passage toward the pressure release mechanism. Furthermore, since the projection of the support block on the first wall does not overlap with the pressure release mechanism, the support block is offset from at least a portion of the pressure release mechanism, further reducing the possibility of deformation of the pressure release mechanism due to pressure from the support block.

[0103] In some examples, a reinforcing rib is provided on the plate body at a location opposite the pressure release mechanism.

[0104] In this example, the installation of reinforcing ribs on the plate body helps to improve the structural strength of the portion of the plate body corresponding to the pressure release mechanism, and reduces the possibility of deformation of the portion of the plate body corresponding to the pressure release mechanism.

[0105] In some examples, the reinforcing rib is located on one side of the plate body facing the first wall.

[0106] In this example, the reinforcing rib corresponds to the position of the pressure release mechanism, and the reinforcing rib is installed facing the first wall, so that the reinforcing rib provides a barrier between the plate body and the pressure release mechanism, reducing the possibility that the plate body will press against the pressure release mechanism.

[0107] In some instances, the reinforcing ribs extend to the edges of the plate body.

[0108] The reinforcing ribs in this example extend to the edges of the plate body, thereby increasing the length of the reinforcing ribs and improving the strength of the exhaust structure.

[0109] In some instances, the reinforcing ribs extend to adjacent support blocks.

[0110] In this example, the reinforcing ribs extend to adjacent support blocks, allowing them to fit together, thereby improving the structural strength of the reinforcing ribs and further helping to improve the strength of the overall structure of the exhaust structure.

[0111] In some instances, the reinforcing ribs extend to the edges of the plate body and into the adjacent support blocks.

[0112] In this example, the reinforcing ribs extend to the edge of the plate body, thereby improving the structural strength of the edge of the plate body, and the reinforcing ribs are connected to adjacent support blocks, thereby improving the strength of the reinforcing ribs and further improving the deformation resistance of the plate body.

[0113] In some examples, the height of the reinforcing ribs is less than the height of the support blocks across the thickness of the first wall.

[0114] By making the height of the reinforcing ribs in this example smaller than the height of the support blocks, the reinforcing ribs can improve the structural strength of the plate body and reduce the possibility of the reinforcing ribs coming into contact with the explosion-proof valve, thereby reducing damage to the explosion-proof valve caused by the reinforcing ribs.

[0115] In some instances, the reinforcing ribs are integral with the plate body.

[0116] In this example, the reinforcing rib is provided integrally with the plate body, which facilitates molding of the reinforcing rib and improves the structural strength of the reinforcing rib and the plate body.

[0117] In some examples, the reinforcing ribs are separate from the plate body and are connected to each other.

[0118] In this example, the reinforcing rib is connected and fixed to the plate body, thereby reducing the possibility of the reinforcing rib falling off and further improving the stability of the reinforcing rib.

[0119] In some examples, the exhaust structure includes a plate body including a first surface disposed along a thickness direction of the plate body, and the fluid passage is a groove disposed in the first surface.

[0120] The fluid passage in this example is a recessed groove opened in the first surface, which makes it easy to form the fluid passage.

[0121] In some examples, the exhaust structure includes a plurality of spaced apart sub-exhaust structures, with fluid passageways formed between adjacent sub-exhaust structures.

[0122] In this example, multiple sub-exhaust structures are combined to form an exhaust structure having a fluid passage, which makes it easy to determine the placement and installation method of the sub-exhaust structures according to the placement of the internal space of the battery cell after the multiple sub-exhaust structures are molded separately, and further improves the circulation performance of the internal airflow of the battery cell while making it easier to place the exhaust structure.

[0123] In some examples, the battery cell further includes an insulating film wrapped around the outer periphery of the electrode assembly, and the insulating film is connected to the sub-exhaust structure.

[0124] In this embodiment, the insulating film is provided to isolate the electrode assembly from the outer casing, thereby reducing contact between the electrode assembly and the outer casing, and is connected to the sub-exhaust structure to fix the sub-exhaust structure to the insulating film, thereby further improving the structural stability of the exhaust structure.

[0125] In some examples, the outer casing includes a second wall, and the second wall includes a second sub-wall on which the electrode terminal is located.

[0126] In this example, the installation of the electrode terminals facilitates charging and discharging of the battery cells, and by installing the electrode terminals on the second sub-wall, the electrode terminals are offset from the first wall, further reducing interference between the electrode terminals and the pressure release mechanism on the first wall.

[0127] In some instances, the second sub-wall faces the first wall.

[0128] In this example, the second sub-wall faces the first wall, so that the electrode terminal and the pressure release mechanism can be located on two opposing wall surfaces of the outer casing, respectively, further reducing the possibility of interference between the electrode terminal and the explosion-proof valve.

[0129] In some instances, the second sub-wall is connected to the first wall.

[0130] In this example, the second sub-wall is connected to the first wall, so that the second sub-wall can be offset from the first wall, and further, the electrode terminal and the explosion-proof valve face different directions of the battery cell, reducing the possibility of interference between the electrode terminal and the explosion-proof valve.

[0131] In some examples, the electrode assembly includes a tab facing the second sub-wall.

[0132] The tab in this example is used for electrical connection with the electrode terminal, and by having the tab face the second sub-wall, electrical connection between the tab and the electrode terminal can be facilitated.

[0133] In some instances, the second sub-wall is an end cap.

[0134] In this example, the second sub-wall is used as an end cap, which makes it easy to attach electrode terminals.

[0135] In some examples, the exhaust structure includes a plate body and a support block, the plate body including a first surface disposed along a thickness direction of the plate body, the support block disposed on the first surface, a fluid passage formed around the periphery of the support block, and a dimension of the support block: The support block is elongated, the length of the plate body is L0, the length of the support block is L1, and the length L1 of the support block is 0.25L0 or more; The thickness H0 of the support block along the thickness direction of the plate body is 0.1 mm or more and 5 mm or less. At least one of the following conditions is satisfied: the support block is elongated, the width of the plate body is A0, and the overall width of the support block is 0.2A0 or more and 0.8A0 or less.

[0136] In this example, when the length L1 of the support block and the plate body is 0.25L0 or more, the length of the support block matches the length of the plate body, and the support block can provide support for the plate body. Furthermore, the airflow passage formed around the support block is not too small, and the exhaust structure has relatively good structural strength and relatively excellent exhaust performance.

[0137] In this example, if the thickness of the support block is greater than or equal to 0.1 mm and less than or equal to 5 mm, the support block has relatively good structural strength, the space occupied by the support block is relatively appropriate, and the impact on the energy density of the battery cell is relatively small.

[0138] In this example, when the width A2 of the support block is greater than or equal to 0.2A0 and less than or equal to 0.8A0, a fluid passage can be formed around the outer periphery of the support block in the width direction of the plate body, which results in a relatively good exhaust performance of the exhaust structure. In addition, the support block provides better support to the plate body, which helps to improve the structural strength of the exhaust structure.

[0139] The present application further proposes an example of a battery including the battery cell of any one of the above examples.

[0140] The battery in this example includes the battery cell in the above example, and the exhaust structure in the battery cell improves the airflow flow performance in the battery cell, which can help improve the reliability of the battery cell.

[0141] The present application further proposes an example of an electrical device including a battery cell according to any one of the above examples or a battery according to any one of the above examples. [Brief explanation of the drawings]

[0142] In order to more clearly explain the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to the structures shown in these drawings without any creative work. [Figure 1] 1 is a structural schematic diagram of an example of an electrical device of the present application; [Figure 2] 1 is a structural schematic diagram of an example of a battery according to the present application. [Figure 3]1 is a structural schematic diagram of an example of a battery cell according to the present application. [Figure 4] 1 is a local cross-sectional view of an example of an installation state of an exhaust structure of the present application within a battery cell. [Figure 5] FIG. 4 is a locally enlarged view of region 4A in FIG. [Figure 6] FIG. 2 is a structural schematic diagram of another example of a battery cell according to the present application. [Figure 7] 1 is a structural schematic diagram of an example of an exhaust structure of the present application in which a support block is installed on the second surface. [Figure 8] 1 is a structural schematic diagram of an example of an exhaust structure of the present application in which a support block is installed on a first surface. [Figure 9] 1 is a structural schematic diagram of an example of an exhaust structure in which support blocks are installed on both the second surface and the first surface of the present application. [Figure 10] FIG. 10 is a structural schematic diagram of another example of an exhaust structure of the present application in which a support block is installed on a first surface. [Figure 11] FIG. 1 is a structural schematic diagram of an example when the support blocks of the present application are distributed along the length direction of the bottom support plate. [Figure 12] FIG. 10 is a structural schematic diagram of another example when the support blocks of the present application are distributed along the width direction of the bottom support plate. [Figure 13] FIG. 10 is a structural schematic diagram of another example when the support blocks of the present application are distributed along the length direction of the bottom support plate. [Figure 14] FIG. 2 is a schematic exploded view of a further example of a battery cell according to the present application. [Figure 15] FIG. 15 is a top view of FIG. [Figure 16] FIG. 15 is a cross-sectional view taken along line 15A-15A in FIG. [Figure 17] FIG. 16 is a locally enlarged view of region 16A in FIG. [Figure 18] FIG. 15 is a structural schematic diagram of an example of the exhaust structure in FIG. 14. [Figure 19] FIG. 19 is a top view of FIG. [Figure 20] FIG. 20 is a cross-sectional view taken along line 19A-19A in FIG. [Figure 21] FIG. 20 is a locally enlarged view of a portion 20A in FIG. [Figure 22] 10 is a structural schematic diagram of an example of an exhaust structure when a second communication hole of the present invention is provided in a support block. FIG. [Figure 23] FIG. 22 is a locally enlarged view of the region 22A in FIG. [Figure 24] 10 is a structural schematic diagram of another example of an exhaust structure when a second communication hole of the present invention is installed in a support block. FIG. [Figure 25] 1 is a schematic exploded view showing an example of an interlocking state of an insulating film, an insulating sheet, and an exhaust structure according to the present invention; [Figure 26] 1 is a structural schematic diagram of an example of a fitted state of an insulating film and an exhaust structure of the present application. [Figure 27] FIG. 27 is a top view of FIG. 26. [Figure 28] FIG. 27 is a bottom view of FIG. 26. [Figure 29] FIG. 10 is a bottom view of another example of a fitted state of the insulating film and the exhaust structure of the present application. [Figure 30] 1 is a structural schematic diagram of an example of the positional relationship between a support block and a plate body of the present application. FIG. [Figure 31] 1 is a schematic structural diagram of an example of a support block, a plate body, and an insulating film in a hot-melt connection state according to the present invention; [Figure 32] 1 is a structural schematic diagram of an example of a reinforcing rib of the present application. [Figure 33] FIG. 10 is a structural schematic diagram of another example of a reinforcing rib of the present application. [Figure 34] 4 is a schematic diagram illustrating an example of the positional relationship between a reinforcing rib and a support block when the exhaust structure of the present application is installed. FIG. [Figure 35] 1 is a structural schematic diagram of an example of an exhaust structure in a state in which a recessed groove of the present invention forms a fluid passage. [Figure 36] The present invention relates to an exhaust system including a sub-exhaust structure, a fuel tank, a fuel tank cover ... DETAILED DESCRIPTION OF THE INVENTION

[0143] The technical solutions in the embodiments of the present application will be explained clearly and completely below with reference to the drawings in the embodiments of the present application, but it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments, and all other embodiments obtained based on the embodiments of the present application without the need for creative work by those skilled in the art fall within the scope of protection of the present application.

[0144] It should be noted that in the embodiments of the present application, when directional indications (up, down, left, right, front, back, etc.) are mentioned, the directional indications are merely for interpreting the relative positional relationships, movement situations, etc. between each component in a certain position (as shown in the drawings), and when the certain position changes, the directional indications also change correspondingly.

[0145] Furthermore, when the embodiments of the present application refer to descriptions such as "first" and "second," the descriptions "first" and "second" are for explanatory purposes only and should not be understood as indicating or implying the relative importance or the number of the designated technical features. Therefore, a feature defined by "first" or "second" may explicitly or implicitly include at least one of the designated feature. Furthermore, technical solutions in each embodiment may be combined with each other, but this must be feasible by a person skilled in the art. If the combination of technical solutions is mutually inconsistent or infeasible, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0146] As used herein, a plurality refers to at least two, inclusive.

[0147] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be continuously used after being discharged by activating the active material through charging.

[0148] The battery cells may be lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel metal hydride batteries, nickel cadmium batteries, lead acid batteries, etc., and examples of the present application are not limited thereto.

[0149] A battery cell generally includes an electrode assembly, which includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are repeatedly inserted and removed between the positive electrode and the negative electrode. The separator, located between the positive electrode and the negative electrode, prevents short circuits between the positive electrode and the negative electrode and allows the active ions to pass through.

[0150] In some embodiments, the positive electrode may be a positive electrode strip that may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0151] As an example, the positive electrode current collector has two surfaces that face each other in the thickness direction of the positive electrode current collector, and the positive electrode active material is disposed on one or both of the two facing surfaces of the positive electrode current collector.

[0152] For example, the positive electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector is formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymeric material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0153] As an example, the positive electrode active material may include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of a battery may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (also abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0154] In some embodiments, the positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When a metal foam is used as the positive electrode, a positive electrode active material may or may not be provided on the surface of the metal foam. For example, a lithium source material, such as potassium metal or sodium metal, may be filled and / or deposited in the metal foam, and the lithium source material may be lithium metal and / or a lithium-rich material.

[0155] In some embodiments, the negative electrode may be a negative electrode strip, which may include a negative electrode current collector.

[0156] For example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, the metal foil may be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymeric material base layer and a metal layer. The metal foam may be nickel foam, copper foam, aluminum foam, an alloy foam, or carbon foam. The composite current collector is constructed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymeric material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene). For example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector is constructed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0157] As an example, the negative electrode piece can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0158] As an example, the negative electrode current collector has two surfaces that face each other in the thickness direction of the negative electrode current collector, and the negative electrode active material is disposed on either one or both of the two facing surfaces of the negative electrode current collector.

[0159] For example, the negative electrode active material may be any negative electrode active material known in the art for use in battery cells, and may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0160] In some embodiments, the negative electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When a metal foam is used as the negative electrode piece, the negative electrode active material may or may not be applied to the surface of the metal foam.

[0161] As an example, a lithium source material, potassium metal or sodium metal may be loaded or / and deposited in the negative electrode current collector, where the lithium source material is lithium metal and / or a lithium-rich material.

[0162] In some embodiments, the material of the positive current collector may be aluminum and the material of the negative current collector may be copper.

[0163] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0164] In some embodiments, the separator is a separator film. The present application does not particularly limit the type of separator film, but any separator film having a known porous structure and good chemical and mechanical stability can be selected.

[0165] For example, the main material of the separator film may be at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0166] In some embodiments, the separator is a solid electrolyte that is disposed between the positive and negative electrodes and serves to transport ions and separate the positive and negative electrodes.

[0167] In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive electrode and the negative electrode. The present application does not specifically limit the type of electrolyte, and the electrolyte can be selected according to needs. The electrolyte may be in a liquid state, a gel state, or a solid state.

[0168] In some embodiments, the electrode assembly is a wound structure, in which the positive electrode piece and the negative electrode piece are wound into the wound structure.

[0169] In some embodiments, the electrode assembly is a laminate structure.

[0170] For example, a plurality of positive electrode pieces and a plurality of negative electrode pieces can be provided, and the plurality of positive electrode pieces and the plurality of negative electrode pieces are provided in an alternating stack.

[0171] As an example, multiple positive electrode pieces can be installed, and the negative electrode pieces can be folded to form multiple folded tiers that are installed in a stack, with one positive electrode piece sandwiched between adjacent folded tiers.

[0172] In one example, both the positive and negative electrode pieces are folded to form a plurality of folds arranged in a stacked manner.

[0173] For example, a plurality of separators may be provided, each disposed between any adjacent positive and negative electrode pieces.

[0174] As an example, the separator can be placed continuously and folded or wound between any adjacent positive and negative electrode pieces.

[0175] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, polygonal, or the like.

[0176] In some embodiments, the electrode assembly is provided with tabs through which electrical current can be conducted from the electrode assembly, including a positive electrode tab and a negative electrode tab.

[0177] In some embodiments, the battery cell may include an exterior casing. The exterior casing is used to enclose components such as the electrode assembly and the electrolyte. The exterior casing may be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite exterior casing), an aluminum-plastic film, or the like.

[0178] As an example, the battery cells may be cylindrical battery cells, prismatic battery cells, soft-pack battery cells, or battery cells of other shapes, and prismatic battery cells include polygonal prismatic batteries such as rectangular battery cells, blade-shaped battery cells, and hexagonal battery cells, and are not particularly limited in this application.

[0179] In some embodiments, the exterior casing includes an end cap that closes the opening to form a sealed space for containing materials such as the electrode assembly and the electrolyte, and a casing having an opening. One or more openings may be provided in the casing. One or more end caps may be provided.

[0180] In some embodiments, at least one electrode terminal is provided on the exterior casing and electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting component. The electrode terminal may be provided on the end cap or on the casing.

[0181] In some embodiments, the exterior casing is provided with a pressure release mechanism, which is used to release the internal pressure of the battery cells.

[0182] For example, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure release mechanism is activated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure release mechanism is activated or a frangible structure within the pressure release mechanism is broken, thereby forming an opening or passage for releasing the internal pressure or temperature. The design of the threshold varies depending on the design requirements. The threshold can depend on one or more materials of the positive electrode piece, the negative electrode piece, the electrolyte, and the separator in the battery cell.

[0183] As an example, the pressure relief mechanism may be integrally molded with the outer casing.

[0184] As an example, the pressure release mechanism may be installed separately from and connected to the outer casing.

[0185] The term "activation" as used herein refers to the pressure relief mechanism generating an action or being activated to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The action generated by the pressure relief mechanism can include, but is not limited to, a member in the pressure relief mechanism moving to form an exhaust passage, or at least a portion of the pressure relief mechanism rupturing, crushing, tearing, or opening. When the pressure relief mechanism is activated, the high-temperature, high-pressure material inside the battery cell is discharged to the outside through the activated portion as a discharge. In this way, pressure and temperature relief of the battery cell can be achieved at a controllable pressure or temperature, thereby avoiding the occurrence of potentially more serious accidents.

[0186] The emissions from battery cells referred to in this application include, but are not limited to, electrolyte, dissolved or separated positive and negative electrode pieces, separator fragments, high temperature and pressure gases produced by reactions, flames, etc.

[0187] The battery referred to in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or series-parallel via a bus member.

[0188] In some embodiments, the battery may be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0189] In some embodiments, the battery may be a battery pack including a case and battery cells, with the battery cells or modules housed within the case.

[0190] In some embodiments, the case may be used as part of a chassis structure of a vehicle, for example, a portion of the case may be at least a portion of a base plate of the vehicle, or a portion of the case may be at least a portion of a cross member and a side member of the vehicle.

[0191] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage electrical cabinet, or the like.

[0192] In recent years, new energy vehicles have made great strides in development, and in the field of electric vehicles, power batteries play an irreplaceable and important role as the power source for electric vehicles. A battery consists of a case and a number of battery cells housed within the case. As a core component of new energy vehicles, batteries have relatively high requirements in terms of both safety and cycle life.

[0193] In related designs, a pressure release mechanism is typically installed in the exterior casing of a battery cell to improve the reliability of the battery cell. At the same time, an insulating plate is typically installed between the electrode assembly and the exterior casing to protect the electrode assembly or to insulate the electrode assembly from the exterior casing. The insulating plate blocks the flow of gas inside the battery cell. If the battery cell experiences thermal runaway, the insulating plate may block the space between the electrode assembly and the exterior casing, impairing the flow of gas and causing the pressure release mechanism to open inappropriately, resulting in reduced reliability of the battery cell. This problem is particularly pronounced when the insulating plate is installed to cover the pressure release mechanism.

[0194] To address the above-mentioned problems, the present application proposes a battery cell including an exterior casing, an electrode assembly, and an exhaust structure. The exterior casing has an internal cavity, and both the electrode assembly and the exhaust structure are disposed in the internal cavity. The exterior casing has a first wall, and the exhaust structure is disposed between the electrode assembly and the first wall. A fluid passage is disposed in the exhaust structure, and the fluid passage is used to form a path for airflow in the internal cavity. This allows airflow to flow between the first wall and the electrode assembly, reducing airflow blockage due to the electrode assembly or the first wall. Furthermore, airflow can flow to a predetermined position along the fluid passage, further improving the airflow flow performance inside the battery cell, facilitating timely pressure relief for thermal runaway battery cells, and improving the reliability of the battery cell.

[0195] The battery cell in the example of the present application can be used in a battery, and the battery can include a case in which the battery cell is mounted. One or more battery cells can be mounted in the case. When multiple battery cells are mounted in the case, the multiple battery cells can be connected to each other in series, parallel, or a mixed series-parallel connection. By adopting the above battery cell in the battery of the example, the airflow inside the battery cell can be improved, thereby improving the reliability of the battery cell and further improving the reliability of the battery composed of the battery cell.

[0196] The batteries in the examples of this application can be used in electrical devices, including, but not limited to, mobile phones, handheld devices, laptops, electric scooters, electric vehicles, boats, spacecraft, electric toys, and power tools. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships. Electric toys include stationary or mobile electric toys, such as game consoles, electric toy cars, electric toy boats, and electric toy airplanes. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as power drills, power grinders, power wrenches, power screwdrivers, power hammers, impact drills, concrete vibrators, and power planers.

[0197] 1 and 2 , for ease of explanation, the vehicle in this example is an electric device 1000. The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extender vehicle. A drive mechanism 300, a control mechanism 200, and a battery 100 may be installed inside the vehicle. The drive mechanism 300 may be a motor, etc. The control mechanism 200 is used to control the battery 100 to supply power to the drive mechanism 300. For example, the battery 100 may be installed at the bottom, front, or rear of the vehicle. The battery 100 may also be used to power other devices in the vehicle. For example, the battery 100 may be used as an operating power source for the vehicle to meet the operating power needs of the vehicle's circuit systems, such as vehicle startup, navigation, and driving. In another example of the present application, the battery 100 may not only be the operating power source for the vehicle, but also provide driving power to the vehicle by fully or partially replacing fuel or natural gas as the vehicle's driving power source. The vehicle in this example employs the battery 100 described above, and improving the reliability of the battery 100 can help improve the reliability of the electric device 1000 .

[0198] 3 to 5, some examples of the present application disclose a battery cell 110 including an exterior casing 120, an electrode assembly 130, and an exhaust structure 160. The exterior casing 120 has an internal cavity and a first wall 121. The electrode assembly 130 is provided in the internal cavity, and the exhaust structure 160 provided between the first wall 121 and the electrode assembly 130 has a fluid passage 164.

[0199] The exterior casing 120 forms an outer casing structure for the battery cell 110. The exterior casing 120 is hollow at least partially to form an internal cavity. The exterior casing 120 has an opening 123 that communicates with the internal cavity. The exterior casing 120 has a first wall 121 that is one of the walls of the exterior casing 120. The first wall 121 may be at least one of the bottom wall, top wall, or side wall of the exterior casing 120. The exterior casing 120 may be an aluminum casing or other material.

[0200] The electrode assembly 130 is attached to the internal cavity. The electrode assembly 130 may have a wound structure or a stacked structure. The electrode assembly 130 may be inserted into the internal cavity of the outer casing 120 through the opening 123 of the outer casing 120.

[0201] The exhaust structure 160 is attached to the internal cavity and is located between the electrode assembly 130 and the first wall 121. The exhaust structure 160 is used to isolate the first wall 121 from the electrode assembly 130 so that the electrode assembly 130 does not come into contact with the first wall 121. The fluid passage 164 is an airflow passage installed in the exhaust structure 160 and is used to allow airflow in the internal cavity. Because the exhaust structure 160 is installed between the electrode assembly 130 and the first wall 121, the fluid passage 164 in the exhaust structure 160 can be used to allow airflow to flow between the first wall 121 and the electrode assembly 130.

[0202] The exhaust structure 160 may be made of insulating material such as plastic, polypropylene, or the like.

[0203] The exhaust structure 160 in this example can be used to provide insulation between the electrode assembly 130 and the first wall 121 of the exterior casing 120, further reducing the possibility of a short circuit in the electrode assembly 130 and helping to improve the reliability of the battery cell 110. Due to the insulation provided by the exhaust structure 160, even if a certain amount of deformation occurs in the exterior casing 120, the exhaust structure 160 can isolate the first wall 121 from the electrode assembly 130, further reducing problems such as a short circuit caused by contact between the electrode assembly 130 and the first wall 121.

[0204] In this example, the fluid passage 164 of the exhaust structure 160 is used to form a passage for the airflow. Since the exhaust structure 160 is installed between the first wall 121 and the electrode assembly 130, the fluid passage 164 is used to allow the airflow between the first wall 121 and the electrode assembly 130, further improving the airflow performance between the first wall 121 and the electrode assembly 130.

[0205] The fluid passage 164 in this example allows the airflow to flow to a predetermined location. For example, the first wall 121 can be used to mount the pressure relief mechanism 140. The exhaust structure 160 can also isolate the first wall 121 and the electrode assembly 130 from each other, thereby reducing the possibility that the electrode assembly 130 will block the pressure relief mechanism 140. The fluid passage 164 is also installed in the exhaust structure 160, forming a path for the airflow to flow to the pressure relief mechanism, which can further facilitate the airflow to flow to the pressure relief mechanism 140, thereby improving the performance of the pressure relief mechanism 140.

[0206] 6, the first wall 121 in this example may be any one wall surface of the outer casing 120, or may be multiple wall surfaces of the outer casing 120. When the first wall 121 is multiple wall surfaces of the outer casing 120, an exhaust structure 160 may be installed between each first wall 121 and the electrode assembly 130.

[0207] Referring to FIG. 6, the exterior casing 120 includes two first walls 121, and one exhaust structure 160 is provided corresponding to each of the first walls.

[0208] The exhaust structure 160 can isolate the electrode assembly 130 from the first wall 121, thereby reducing the possibility of contact between the electrode assembly 130 and the outer casing 120 and further improving the reliability of the battery cell 110. In addition, the fluid passage 164 of the exhaust structure 160 can improve the airflow flow performance at different positions inside the battery cell 110, so that the airflow at different positions inside the battery cell 110 can flow to a predetermined position along the fluid passage 164. Furthermore, the pressure release mechanism 140 can control the pressure release of the airflow, thereby improving the pressure release effect of the pressure release mechanism 140 when there is a risk of thermal runaway in the battery cell 110.

[0209] The fluid passage 164 in this example is used to allow the airflow to flow. In some examples, the fluid passage 164 is a passage for allowing the airflow to flow, which is installed on the surface of the exhaust structure 160. In some examples, the fluid passage 164 is a passage drilled inside the exhaust structure 160, and an end of the passage communicates with the surface of the exhaust structure 160. In some examples, a portion of the fluid passage 164 is drilled inside the exhaust structure 160, and a portion is installed on the surface of the exhaust structure 160.

[0210] In this example, the number of fluid passages 164 may be one, or may be multiple. When the exhaust structure 160 has multiple fluid passages 164, the multiple fluid passages 164 may be installed independently of each other, or the multiple fluid passages 164 may be in communication with each other.

[0211] In some examples, the length of the exhaust structure 160 is less than or equal to the length of the first wall 121, and the width of the exhaust structure 160 is less than or equal to the width of the first wall 121, thereby providing a barrier between the first wall 121 and the electrode assembly 130.

[0212] In the example of the present application, an exhaust structure 160 is installed in the internal cavity, and the exhaust structure 160 is attached between the electrode assembly 130 and the first wall 121 of the exterior casing. The fluid passage 164 in the exhaust structure 160 is used as a passage for airflow, thereby reducing the obstruction of airflow caused by the exhaust structure 160 between the first wall 121 and the electrode assembly. This allows the airflow to flow to a predetermined position through the fluid passage 164, thereby improving the reliability of the battery cell.

[0213] In some examples, the fluid passage 164 communicates with an edge of the exhaust structure 160 in a first direction 4B, the first direction intersecting the thickness direction of the first wall 121.

[0214] 4 and 5, the thickness direction of the first wall 121 in this example may be direction 4C in Fig. 4. In this example, the fact that the first direction 4B intersects with the thickness direction of the first wall 121 means that the first direction 4B is not parallel to the thickness direction of the first wall 121; alternatively, the first direction 4B may be perpendicular to the thickness direction of the first wall 121.

[0215] The edge of the exhaust structure 160 in the first direction 4B may be any edge in the first direction 4B of the exhaust structure 160. In some examples, the exhaust structure 160 is a rectangular plate, and the exhaust structure 160 has a length direction and a width direction, and the edge of the exhaust structure 160 in the first direction 4B may refer to at least one edge of the exhaust structure 160 in the length direction or the width direction.

[0216] Referring to Figure 6, the fluid passage 164 communicating with the edge portion of the exhaust structure 160 in the first direction 4B means that the fluid passage 164 has at least two openings, at least one opening of the fluid passage 164 communicating with the edge portion of the exhaust structure 160 in the first direction 4B, and at least one opening of the fluid passage 164 being offset from the edge portion of the exhaust structure 160 in the first direction 4B.

[0217] In this example, by connecting the fluid passage 164 to the edge of the exhaust structure 160 in the first direction 4B, it is possible to facilitate the airflow outside the edge of the exhaust structure 160 in the first direction 4B to flow along the fluid passage 164, thereby allowing the airflow outside the edge of the exhaust structure 160 in the first direction 4B to flow to a predetermined position along the fluid passage 164. In this example, the airflow at the edge position of the exhaust structure 160 in the first direction 4B can be guided to a predetermined position along the fluid passage 164, thereby reducing the problem of local temperature rise due to blockage of the airflow at the edge position of the exhaust structure 160 in the first direction 4B.

[0218] In some embodiments, the first direction 4B intersects the thickness direction of the first wall 121, and the fluid passage 164 is connected to the edge of the exhaust structure 160 in the first direction 4B, so that airflow outside the edge of the exhaust structure 160 in the first direction 4B can enter the fluid passage 164 and flow to a predetermined position.

[0219] Referring to Figures 4 and 5, in some examples, the outer casing 120 includes a second wall 122, a first gap 132 is formed between the outer peripheral surface of the electrode assembly 130 and the second wall 122, and the fluid passage 164 is in communication with the first gap 132.

[0220] In this example, the second wall 122 may be any wall surface other than the first wall 121 of the outer casing 120. For example, the first wall 121 is the bottom wall of the outer casing 120, and the second wall 122 may be the side wall or top wall of the outer casing 120.

[0221] In some embodiments, the second wall 122 may be a wall directly connected to the first wall 121 .

[0222] In this example, the outer peripheral surface of the electrode assembly 130 refers to the surface of the electrode assembly 130 that faces the second wall 122. A first gap 132 is formed between the outer peripheral surface of the electrode assembly 130 and the second wall 122 to allow airflow therethrough.

[0223] The fluid passage 164 being connected to the first gap 132 means that at least one opening of the fluid passage 164 is connected to the first gap 132, and the airflow within the first gap 132 can flow along the fluid passage 164 to a predetermined position.

[0224] In this example, by forming the first gap 132, a space for airflow can be formed on the outer peripheral surface of the electrode assembly 130, and during the airflow process, the airflow can guide heat generated in the outer peripheral surface of the electrode assembly 130 to the fluid passage 164, thereby improving the temperature reduction performance of the outer peripheral surface of the electrode assembly 130 and reducing the possibility of local temperature increases occurring at the outer peripheral surface of the electrode assembly 130. Furthermore, as the airflow flows from the first gap 132 to the fluid passage 164, the airflow can reduce the temperature of the second wall 122 adjacent to the outer peripheral surface of the electrode assembly 130, thereby reducing the possibility of deformation of the second wall 122 in the portion adjacent to the outer periphery of the electrode assembly 130.

[0225] In this example, the first gap 132 may be in communication with the fluid passage 164 , and in some examples, multiple fluid passages 164 of the exhaust structure 160 are in communication with the first gap 132 .

[0226] Referring to Figures 4 and 5, in some examples, the outer casing 120 includes a second wall 122, and a second gap 161c is formed between the outer peripheral surface of the exhaust structure 160 and the second wall 122 of the outer casing 120, and the fluid passage 164 is connected to the second gap 161c.

[0227] The second wall 122 in this example may be the same as the second wall 122 described in the previous example, or the second wall 122 in this example may be in a different position than the wall in the previous example.

[0228] The outer peripheral surface of the exhaust structure 160 in this example refers to the surface of the exhaust structure 160 that faces the second wall 122. The outer peripheral surface of the exhaust structure 160 may be the outer peripheral surface in the first direction described in any one of the above examples. A second gap 161c is formed between the outer peripheral surface of the exhaust structure 160 and the second wall 122 so that at least a portion of the surface of the exhaust structure 160 that faces the corresponding second wall 122 does not contact the second wall 122. In some embodiments, the surface of the exhaust structure 160 that faces the corresponding second wall 122 is installed with a gap between it and the second wall 122.

[0229] In this example, the fluid passage 164 is connected to the second gap 161c, which means that at least one opening of the fluid passage 164 is connected to the second gap 161c, and the airflow in the second gap 161c can flow along the fluid passage 164 to a predetermined position, which can further improve the airflow circulation performance within the battery cell 110.

[0230] In this example, by forming the second gap 161c, the airflow can flow along the second gap 161c to the fluid passage 164, and the flow of the airflow further reduces the temperature of the second wall 122 adjacent to the outer peripheral surface of the exhaust structure 160, and further reduces the possibility of deformation of the second wall 122 adjacent to the outer peripheral surface of the exhaust structure 160.

[0231] Referring to Figures 4 and 5, in some examples, the outer casing 120 includes a second wall 122, a first gap 132 is formed between the outer peripheral surface of the electrode assembly 130 and the second wall 122, and the fluid passage 164 is connected to the first gap 132, and a second gap 161c is formed between the outer peripheral surface of the exhaust structure 160 and the second wall 122 of the outer casing 120, and the fluid passage 164 is connected to the second gap 161c.

[0232] In this example, the second gap 161c and the first gap 132 may be simultaneously connected through the same fluid passage 164, or in this example, the second gap 161c and the first gap 132 may be respectively connected through different fluid passages 164.

[0233] The exhaust structure 160 is installed between the electrode assembly 130 and the first wall 121. Therefore, by providing the first gap 132 and the second gap 161c, the airflow on the outer circumferential surface of the electrode assembly 130 can flow along the fluid passage 164 toward the first wall 121, and further, the airflow on the outer circumferential surface of the electrode assembly 130 can easily flow to a predetermined position, thereby improving the airflow circulation performance inside the battery cell 110.

[0234] 4 to 13, in some examples, the exhaust structure 160 includes a plate body 161 including a first surface 161b disposed along the thickness direction of the plate body 161, and the fluid passage 164 is disposed on the first surface 161b.

[0235] The plate body 161 serves as the main structure of the exhaust structure 160 and is attached between the first wall 121 and the electrode assembly 130. The first surface 161b is the surface of the plate body 161 in the thickness direction.

[0236] In this example, by installing the fluid passage 164 on the first surface 161b, the surface in the thickness direction of the plate body 161 can be fully utilized, thereby increasing the total area of ​​the fluid passage 164 of the exhaust structure 160, increasing the airflow flow space, and improving the airflow flow performance.

[0237] The thickness direction of the plate body 161 in this example may be set perpendicular to the first direction described in any one of the above examples.

[0238] In this example, the thickness direction of the plate body 161 is the same as the thickness direction of the first wall 121 .

[0239] In order to allow the airflow on one side of the plate body 161 facing the first wall 121 to flow to a predetermined position, the first surface 161b in this example may be installed facing the first wall 121, and the fluid passage 164 is provided on the one side of the plate body 161 facing the first wall 121. In order to allow the airflow on one side of the plate body 161 facing the electrode assembly 130 to flow to a predetermined position, the first surface 161b in this example may be installed facing the electrode assembly 130.

[0240] 4 and 5 , in some examples, the thickness of the plate body 161 along the thickness direction 4C of the plate body 161 is H, where H is 0.05 mm or more and 1.0 mm or less. In this example, if the thickness H is too small, the structural strength of the plate body 161 will be correspondingly reduced, and the plate body 161 will be more susceptible to deformation or breakage. If the thickness H of the plate body 161 is too large, the space occupied by the exhaust structure 160 inside the battery cell 110 will be too large, the volume of the electrode assembly 130 will be correspondingly reduced, and the energy density of the battery cell 110 will be more likely to decrease. Alternatively, H may be selected to be 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, or 1.0 mm, or H may be selected to be any value within the above range. More optionally, in some examples, H is equal to or greater than 0.2 mm and equal to or less than 0.4 mm.

[0241] In some examples, the depth of the fluid passage 164 along the thickness direction of the plate body 161 is H0, and the depth H0 of the fluid passage 164 is greater than or equal to 0.1 mm and less than or equal to 5 mm. If the depth H0 of the fluid passage 164 is too small, the effective ventilation area of ​​the fluid passage 164 is relatively small, resulting in a decrease in the ventilation performance of the fluid passage 164. If the depth H0 of the fluid passage 164 is too large, the structure of the plate body 161 will be weakened. To ensure the structural strength of the plate body 161, the thickness of the plate body 161 will need to be correspondingly increased, which will further increase the occupied space of the exhaust structure 160 and may reduce the energy density of the battery cell 110. In this example, H0 may be selected to be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.6 mm, 2.5 mm, 4 mm, 5 mm, or any other value within the above range. Optionally, in some examples, the depth of H0 is greater than or equal to 0.2 mm and less than or equal to 0.8 mm.

[0242] In some examples, a support block 163 is mounted on the first surface 161b, and a fluid passage 164 is formed around the support block 163.

[0243] The support block 163 is provided on the first surface 161b, and the support block 163 may be fixedly connected to the plate body 161, or the support block 163 may not be fixed to the plate body 161. The support block 163 is used to form a fluid passage 164 on one side of the first surface 161b of the plate body 161, so that the airflow flows along the fluid passage 164 to a predetermined position.

[0244] In this example, since the exhaust structure 160 is installed between the first wall 121 and the electrode assembly 130, the support block 163 installed on the first surface 161b can be used to increase the overall thickness of the exhaust structure 160. This increases the distance between the electrode assembly 130 and the first wall 121, further increasing the space between the electrode assembly 130 and the first wall 121, and improving the airflow performance.

[0245] In this example, a fluid passage 164 is formed around the support block 163. The shape of the support block 163 can be selected according to specific circumstances, and the support block 163 may be a rectangular parallelepiped, a cylindrical body, an annular body, or a combination of various shapes. A flow passage for airflow is formed between the outer surface of the support block 163 and the first surface 161b.

[0246] 9 and 10, in some examples, a plurality of support blocks 163 are provided on the first surface 161b, and fluid passages 164 are formed between the plurality of support blocks 163.

[0247] In this example, by installing multiple support blocks 163, multiple support positions are formed on the first surface 161b, which can distribute the force applied to the plate body 161 and further reduce deformation of the plate body 161 due to stress concentration. By forming fluid passages 164 between the multiple support blocks 163, the space between the support blocks 163 can be fully utilized, which improves the structural strength of the exhaust structure 160 and makes it easier to form the fluid passages 164.

[0248] In this example, at least two of the support blocks 163 have gaps between them to form fluid passages 164. Optionally, the support blocks 163 are installed at intervals from one another on the first surface 161b, thereby forming the fluid passages 164 on the first surface 161b and improving the exhaust performance of the exhaust structure 160.

[0249] In this example, the plurality of support blocks 163 may be arranged on the first surface 161b in a regular arrangement. The regular arrangement means that the plurality of support blocks 163 are regularly distributed along a predetermined direction, which can further form relatively regular fluid passages 164 on the first surface 161b. In this example, the plurality of support blocks 163 may be irregularly distributed to form irregular fluid passages 164 on the first surface 161b.

[0250] In some examples, the plurality of support blocks 163 are arranged in an array. In this example, the plurality of support blocks 163 may be distributed in a matrix, the plurality of support blocks 163 may form a circular array, or the plurality of support blocks 163 may form a linear array following a predetermined trajectory.

[0251] The array-like arrangement makes it easy to attach or form the plurality of support blocks 163 on the plate body 161 according to a predetermined rule, and the regular distribution simplifies the forming equipment for the support blocks 163, thereby improving the forming efficiency of the support blocks 163. In addition, because the plurality of support blocks 163 are arranged in an array, the distribution of the force on the plate body 161 becomes relatively more uniform, which helps to improve the strength of the exhaust structure 160 and reduce the possibility of deformation of the plate body 161.

[0252] In some examples, the plurality of support blocks 163 are arranged along the width direction of the plate body 161. In this example, the plurality of support blocks 163 can be distributed along the length direction of the plate body 161 to form a plurality of columns. The plurality of support blocks 163 can also be arranged in a plurality of rows extending along the length direction of the plate body 161, which makes the distribution of the bearing force in the length direction of the plate body 161 relatively more uniform and further reduces deformation of the plate body 161 in the length direction.

[0253] In some examples, the plurality of support blocks 163 are arranged along the length of the plate body 161. In this example, the plurality of support blocks 163 can be distributed along the width of the plate body 161 to form a plurality of columns. The plurality of support blocks 163 can also be arranged in a plurality of rows extending along the width of the plate body 161, which makes the distribution of the bearing force in the width of the plate body 161 relatively more uniform and further reduces deformation of the plate body 161 in the width direction.

[0254] In some examples, the support block 163 is a rectangular block or a cylinder. When the support block 163 in this example is a rectangular block, the length direction of the support block 163 may be parallel to the length direction of the plate body 161. When the support block 163 in this example is a cylinder, one axial end of the support block 163 is connected to the first surface 161b, and the other axial end of the support block 163 is located away from the first surface 161b. By making the support block 163 a rectangular block or a cylinder block, the adoption of a regular shape makes it easier to form the support block 163 and further simplifies the forming equipment for the support block 163, thereby improving the production efficiency of the exhaust structure 160.

[0255] 9, the plate body 161 has a second surface 161a disposed opposite the first surface 161b along the thickness direction of the plate body 161, and fluid passages 164 are disposed on both the first surface 161b and the second surface 161a. The configuration of the fluid passages 164 on the first surface 161b may be the same as or different from the configuration of the fluid passages 164 on the second surface 161a. By disposing the fluid passages 164 on both the first surface 161b and the second surface 161a, the area through which the fluid passages 164 can flow can be increased.

[0256] In some examples, a through hole 162 is provided in the plate body 161 , the through hole 162 penetrates the plate body 161 along the thickness direction of the plate body 161 , and the through hole 162 communicates with the fluid passage 164 .

[0257] The through-holes 162 are communicating holes that pass through the plate body 161 and are used to communicate two surfaces of the plate body 161 in the thickness direction.

[0258] The through holes 162 in this example connect two surfaces in the thickness direction of the plate body 161, allowing airflow between the two surfaces in the thickness direction of the plate body 161. The through holes 162 in this example are used to connect the fluid passages 164, allowing airflow to flow to the fluid passages 164 along the thickness direction of the plate body 161, further increasing the airflow flow path within the battery cell 110 and thereby improving the airflow flow performance within the battery cell 110.

[0259] In this example, the fluid passage 164 is disposed on the first surface 161b of the plate body 161. The plate body 161 has a second surface 161a disposed opposite the first surface 161b along the thickness direction of the plate body 161. One end of the through hole 162 communicates with the fluid passage 164, and the other end of the through hole 162 penetrates the second surface 161a, so that the airflow on the second surface 161a can flow to one side of the first surface 161b. As a result, the airflow on one side of the second surface 161a can flow to a predetermined position by passing through the through hole 162 and the fluid passage 164 in order.

[0260] In this example, the number of through holes 162 may be one, or multiple. When multiple through holes 162 are provided in the plate body 161, the multiple through holes 162 may be distributed at intervals to form passages for allowing airflow to flow along the thickness direction of the plate body 161 at multiple locations on the plate body 161. When multiple through holes 162 are provided, the multiple through holes 162 may communicate with the same fluid passage 164, or the multiple through holes 162 may communicate with different fluid passages 164.

[0261] In this example, the through holes 162 may have a circular, elliptical, or polygonal hole structure. When multiple through holes 162 are installed in the plate body 161, the multiple through holes 162 may have the same shape and / or size, or the shapes and / or sizes of the through holes 162 at different positions on the plate body 161 may be different.

[0262] Referring to FIG. 5 , in some examples, the diameter of the through hole 162 is P, and P is 0.5 mm or more and 10 mm or less. If the diameter of the through hole 162 is greater than 10 mm, the structural strength of the plate body 161 decreases and the powder material of the electrode assembly 130 is more likely to move toward the first wall 121 through the through hole 162. If the diameter of the through hole 162 is less than 0.5 mm, the exhaust effect of the through hole 162 decreases. In this example, the inner diameter of the through hole 162 may be 0.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, or any other value within the above diameter range may be selected. Optionally, in this example, the inner diameter of the through hole 162 is 2 mm or more and 4 mm or less.

[0263] The powdered material of the electrode assembly 130 may be a positive electrode active material or a negative electrode active material.

[0264] Several communication holes may be provided on the wall surface of the insulating film facing the exhaust structure 160, thereby increasing the number of paths for the electrolyte to flow. The communication holes in the insulating film may be positioned offset from the through holes 162 in the plate body 161.

[0265] 4 and 5, in some examples, at least a portion of the through holes 162 are interleaved with the support blocks 163.

[0266] In this example, the through holes 162 communicate with the fluid passages 164, forming a passage for airflow to flow to the fluid passages 164. By arranging at least some of the through holes 162 alternately with the support blocks 163, the support blocks 163 are not able to completely block the through holes 162, and the through holes 162 can be maintained in a relatively good state of penetration, thereby improving the airflow performance. Optionally, in some examples, the through holes 162 are arranged completely offset from the support blocks 163, and the support blocks 163 do not block the through holes 162, and the airflow space can be further increased.

[0267] 7 to 13, in some examples, the support blocks 163 have multiple rows, and a through hole 162 is provided between two adjacent rows of the support blocks 163. In this example, the support blocks 163 may be multiple rows arranged along the length direction of the plate body 161, or multiple rows arranged along the width direction of the plate body 161. A fluid passage 164 is formed between two adjacent rows of the support blocks 163, and the through hole 162 can be used to communicate with the fluid passage 164, thereby improving the airflow performance within the battery cell 110.

[0268] In this example, one or more through holes 162 may be installed between two adjacent rows of support blocks 163, and the number of through holes 162 can be determined depending on factors such as the distance between the two adjacent rows of support blocks 163, the shape of the through holes 162, and the dimensions of the through holes 162.

[0269] In some examples, with reference to FIGS. 10-13, the through holes 162 may be arranged in multiple rows, with one or more through holes 162 arranged in each row.

[0270] In this example, the fluid passages 164 between two adjacent rows of support blocks 163 may communicate with each other, or the fluid passages 164 between two adjacent rows of support blocks 163 may not communicate with each other.

[0271] In this example, the use of multiple rows of support blocks 163 can reduce deformation of the plate body 161 due to stress concentration. The placement of through holes 162 between two adjacent rows of support blocks 163 can improve the airflow performance on both sides of the plate body 161 in the thickness direction, and further improve the temperature unevenness on both sides of the plate body 161 in the thickness direction due to the airflow, thereby reducing the problem of deformation of the plate body 161 due to uneven heat received.

[0272] 4, in some examples, the first surface 161b faces the first wall 121. In this example, the support block 163 is installed on the first surface 161b, and the first surface 161b is installed facing away from the electrode assembly 130, and a fluid passage 164 formed on the outer periphery of the support block 163 can be used to guide airflow to one side of the first wall 121. If thermal runaway occurs in the battery cell 110, the airflow can flow quickly to a predetermined position along one side of the first wall 121.

[0273] The support block 163 in this example can further be used to bridge the plate body 161 over the outside of the first wall 121, and the plate body 161 can be used to support the electrode assembly 130 and reduce damage to the electrode assembly 130 due to stress concentration.

[0274] 14 to 17 , in some examples, the battery cell 110 further includes an insulating film 150 wrapped around the outer periphery of the electrode assembly 130, and a first communication hole 151 is provided in the insulating film 150. An exhaust structure 160 is installed between the insulating film 150 and the first wall 121. A second communication hole 165 is provided in the exhaust structure 160, and the second communication hole 165 faces the first communication hole 151.

[0275] In this example, the insulating film 150 has a wall surface facing the exhaust structure 160. The first communication hole 151 is opened in the wall surface of the insulating film 150 facing the exhaust structure 160.

[0276] In this example, the first communication hole 151 and the second communication hole 165 may have the same shape and dimensions, or the shape and dimensions of the first communication hole 151 and the second communication hole 165 may be determined according to specific circumstances.

[0277] The first communication hole 151 and the second communication hole 165 may have a circular hole, an elliptical hole, or a polygonal hole structure.

[0278] The second communication hole 165 may be partially opposed to the first communication hole 151 or may be opposed to the first communication hole 151 completely.

[0279] The insulating film 150 is placed on the outside of the electrode assembly 130, and at least a portion of the insulating film 150 is wrapped around the electrode assembly 130 to isolate the electrode assembly 130 from the outer casing 120 and reduce contact between the electrode assembly 130 and the outer casing 120.

[0280] The exhaust structure 160 is installed between the insulating film 150 and the first wall 121, i.e., the exhaust structure 160 is located outside the insulating film 150, thereby the exhaust structure 160 is used to form isolation between the insulating film 150 and the first wall 121.

[0281] In some examples, a protective film 124 is installed on the outside of the exterior casing 120, and the protective film 124 may be made of an insulating film.

[0282] 17 , a first communication hole 151 is provided in the insulating film 150, and a second communication hole 165 is provided in the exhaust structure 160. The first communication hole 151 is located opposite the second communication hole 165. The first communication hole 151 and the second communication hole 165 can be used for mutual positioning, so that when the insulating film 150 and the exhaust structure 160 are installed, they can be installed according to a predetermined position, and further, the insulating film 150 and the exhaust structure 160 can be maintained at a predetermined installation position and installation state within the battery cell 110, improving the stability of the internal structure of the battery cell 110.

[0283] 18 to 22, in some examples, the second communication hole 165 is installed in the support block 163. Because the support block 163 is a boss that protrudes from the surface of the plate body 161, when the second communication hole 165 is installed in the support block 163, it is easy to block the second communication hole 165, thereby reducing the migration of powder along the second communication hole 165 in a direction away from the electrode assembly 130 and further helping to improve the reliability of the battery cell 110.

[0284] In some examples, the support block 163 has a hollow structure that protrudes opposite to the plate body 161. The second communication hole 165 is located in a bottom wall 163a of the support block 163, and the bottom wall 163a of the support block 163 abuts against the first wall 121.

[0285] By making the support block 163 in this example hollow, the overall weight of the exhaust structure 160 can be reduced and the energy density of the battery cell 110 can be improved. Furthermore, when the support block 163 is opened, the length of the second communication hole 165 can be relatively reduced, facilitating processing. Furthermore, because the bottom wall 163a of the support block 163 abuts against the first wall 121, it is easy to close the second communication hole 165. In this example, the insulating member closes the second communication hole 165, and the first wall 121 provides support and positioning for the support block 163. This allows the support block 163 and the plate body 161 to be maintained at a predetermined position within the battery cell 110, further improving the structural stability of the battery cell 110.

[0286] Referring to FIG. 24, the diameter of the second communication hole 165 in this example is set to be smaller than the width of the support block 163, so that the second communication hole 165 is formed in the bottom wall 163a of the support block 163.

[0287] 24, when a plurality of support blocks 163 are installed on the plate body 161, for example, the support blocks 163 are installed at intervals along the width direction of the plate body 161, and an airflow passage is formed between two adjacent support blocks 163. For example, when two rows of support blocks 163 are installed along the width direction of the first surface 161b of the plate body 161, the plate body 161 and the support blocks 163 are projected onto a plane parallel to the first surface 161b, the total width of the plate body 161 along the width direction of the plate body 161 is A0, and the distance between the support blocks 163 located at the width direction edge positions of the plate body 161 and the edge of the plate body 161 is A1. The width direction of the plate body 161 in this example may be direction 24A in FIG. 24. In the width direction of the plate body 161, the width of each support block 163 is A2, the distance between the opposing end faces of two support blocks 163 is A3, and the distance between the opposing surfaces of two support blocks 163 is A4.

[0288] Furthermore, in some examples, A1 is greater than or equal to 0.5 mm and less than or equal to 300 mm, where A1 may be 0.5 mm, 10 mm, 50 mm, 90 mm, 150 mm, 190 mm, 240 mm, 300 mm, or any value within the above range. If the value of A1 is too large, the distance between the support block 163 and the widthwise edge of the plate body 161 becomes too large, causing the support block 163 to be relatively closer to the widthwise center of the plate body 161, which is likely to cause stress concentration in the plate body 161 and further reduce the structural strength of the reduced plate body 161. If the value of A1 is too small, the gap between the edge of the support block 163 and the widthwise edge of the plate body 161 becomes too small, which may cause the airflow passage on one side of the edge of the support block 163 to be too small, further reducing the airflow rate on one side of the edge of the support block 163. Alternatively, A1 is greater than or equal to 0.5 mm and less than or equal to 90 mm.

[0289] In some examples, A2 is greater than or equal to 0.5 mm and less than or equal to 300 mm, and may be 0.5 mm, 10 mm, 50 mm, 100 mm, 150 mm, 190 mm, 240 mm, 300 mm, or any value within the above range. If the value of A2 is too large, assuming that the width of the plate body 161 is constant, the width of the fluid passage 164 located around the periphery of the support block 163 will be reduced, which may further reduce the exhaust performance of the exhaust structure 160. If the value of A2 is too small, the structural strength of the support block 163 will be relatively low, which will affect the overall strength of the exhaust structure 160. When the support block 163 and the plate body 161 are connected and fixed to each other, the support block 163 will also be easily deformed, which will further affect product quality. In some examples, the plate body 161 is provided with a through-hole 162 as described in any one of the above examples. If the value of A2 is set too small, the distance between adjacent support blocks 163 becomes too small, which may increase the difficulty of opening the through holes 162. Alternatively, by setting A2 to 0.5 mm or more, the support blocks 163 are less likely to deform when attached and fixed to the plate body 161, which further improves the structural strength of the exhaust structure 160. Furthermore, by setting A2 to 90 mm or less, attachment and fixing is easier.

[0290] In some examples, A3 is 0.5 mm or more and 300 mm or less. In this example, A3 may be 0.5 mm, 10 mm, 50 mm, 100 mm, 150 mm, 190 mm, 240 mm, 300 mm, or any value within the above range. Assuming the width of the plate body 161 is constant, if A3 is set too small, the width of the fluid passage 164 formed between the support blocks 163 will be too small, which may reduce the airflow performance within the battery cell 110. If A3 is set too large, the width of the corresponding support block 163 will be reduced to ensure the distance between adjacent support blocks 163, which may further reduce the structural strength of the support block 163. Alternatively, by setting A3 to 0.5 mm or more and 90 mm or less, the fluid passage 164 between adjacent support blocks 163 will have relatively good fluid flow performance, the width of the support block 163 will be suitable for processing, and the exhaust structure 160 will have relatively high structural strength, provided that it has relatively good exhaust performance.

[0291] In some examples, A4 is less than A0, and A4 is greater than or equal to 1 mm and less than or equal to 300 mm. In this example, A4 may be 1 mm, 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, or any other value within the above range. If A4 is set too small, the overall width of the adjacent support blocks 163 will be relatively small, further reducing the strength of the overall structure of the support blocks 163. When the support blocks 163 are installed and fastened, the connection between the support blocks 163 and the plate body 161 will be more likely to break or melt. If A4 is set too large, assuming the overall width of the plate body 161 is constant, the distance A1 between the support blocks 163 and the edges of the plate body 161 in the width direction will also be relatively small, further affecting the airflow performance of the airflow passages at the edges of the support blocks 163. Optionally, by setting A4 to be 1 mm or more and 200 mm or less, the support block 163 can be adapted to the dimensions of the plate body 161, and at the same time, the fluid passage 164 can have relatively good ventilation performance.

[0292] In some examples, the difference between A0 and A4 is -50 mm or more and 50 mm or less. In this example, the support block 163 can partially protrude outward in the width direction of the plate body 161, and a fluid passage 164 is formed between one end face of the support block 163 facing the plate body 161 and a side wall 163b of the edge in the width direction of the plate body 161. Alternatively, by making the difference between A0 and A4 greater than 0 and 10 mm or less, the support block 163 can be better fitted to the plate body 161, and the fluid passage 164 is formed on the outer periphery of the support block 163.

[0293] In some examples, referring to Figures 25 to 27, the battery cell 110 further includes an insulating sheet 152 including a first portion 152a, at least a portion of which is located on one side of the exhaust structure 160 away from the electrode assembly 130 and covers the second communication hole 165.

[0294] One or more insulating sheets 152 may be installed. As shown in Fig. 25 , two insulating sheets 152 may be installed, one at each end of the exhaust structure, to close two second communication holes 165 of the exhaust structure 160, respectively.

[0295] The first portion 152a covering the second communication hole 165 means that the projections of the first portion 152a and the second communication hole 165 overlap. The first portion 152a may be directly attached to the edge of the opening of the second communication hole 165, or may be spaced a certain distance from the second communication hole 165 in the thickness direction of the first wall.

[0296] In this embodiment, at least a portion of the insulating sheet 152 provides insulation between the exhaust structure 160 and the first wall 121. At least a portion of the insulating sheet 152 covers the second communication hole 165, thereby reducing the probability that powder on one side of the electrode assembly 130 will pass through the second communication hole 165, and further improving the reliability of the battery cell 110.

[0297] The shape of the insulating sheet 152 in this example may be the same as the shape of the exhaust structure 160. For example, if the plate body 161 has a rectangular parallelepiped structure, the insulating sheet 152 may have a rectangular sheet structure. In this example, the first portion 152a of the insulating sheet 152 may be a local structure connected to the exhaust structure 160 of the insulating sheet 152.

[0298] When the exhaust structure 160 includes multiple support blocks 163, multiple insulating sheets 152 may be installed on the battery cell 110. For example, in the case where two support blocks 163 are installed at both ends of the plate body in the longitudinal direction, insulating sheets 152 may be installed at both ends of the plate body in the longitudinal direction, with first portions 152a of the insulating sheets 152 insulating the support blocks 163 from the first wall 121, and at least a part of the first portions 152a of the insulating sheets 152 blocking the second communication holes 165.

[0299] The insulating sheet 152 in this example is adhesive tape or may be made of other materials that perform insulating effects.

[0300] In some examples, the first portion 152a is tightly fitted to the opening of the second communication hole 165. In this example, the first portion 152a of the insulating sheet 152 can be used to block the opening of the second communication hole 165, thereby blocking the powder of the electrode assembly 130 from moving through the second communication hole 165 toward the first wall 121.

[0301] Referring to FIG. 28, in some examples, there is a preset distance between the first portion 152a and at least one edge of the plate body 161 in the width direction.

[0302] In this example, the plate body 161 and the first portion 152a of the insulating sheet 152 are projected onto a plane parallel to the first surface 161b. A gap is formed between the first portion 152a of the insulating sheet 152 and at least one edge in the width direction of the plate body 161, and the width of the gap is the predetermined distance described above. In this example, there may be a predetermined distance between the first portion 152a and one edge in the width direction of the plate body 161, or there may be a predetermined distance between the first portion 152a and two corresponding edges in the width direction of the plate body 161. When there are predetermined distances between the first portion 152a and two corresponding edges in the width direction of the plate body 161, the predetermined distances between the first portion 152a and the two corresponding edges in the width direction of the plate body 161 may or may not be equal. In some examples, the predetermined distance between the first portion 152a and the edge in the width direction of the plate body 161 may be A1 as described in the above example.

[0303] In this example, by having a predetermined distance between the first portion 152a and at least one edge portion in the width direction of the plate body 161, the first portion 152a can further improve the exhaust performance of the exhaust structure 160 without completely blocking the air flow passage at the edge position in the width direction of the plate body 161.

[0304] In some examples, there is a preset distance between the support block 163 and at least one edge of the plate body 161 in the width direction.

[0305] In this example, when the plate body 161 and the support block 163 are projected onto a plane parallel to the first surface 161b, a gap is formed between the support block 163 and at least one edge of the plate body 161 in the width direction, and the width of the gap is the predetermined distance described above. In this example, there may be a predetermined distance between the support block 163 and one edge of the plate body 161 in the width direction, or there may be a predetermined distance between the support block 163 and two corresponding edges of the plate body 161 in the width direction. When there are predetermined distances between the support block 163 and two corresponding edges of the plate body 161 in the width direction, the predetermined distances between the support block 163 and the two corresponding edges of the plate body 161 in the width direction may or may not be equal. In some examples, the predetermined distance between the support block 163 and the edge of the plate body 161 in the width direction may be A1 described in the above example.

[0306] In this example, by having a predetermined distance between the support block 163 and at least one edge of the plate body 161 in the width direction, the support block 163 can further improve the exhaust performance of the exhaust structure 160 without completely blocking the air flow passage at the edge position in the width direction of the plate body 161.

[0307] In some examples, there is a predetermined distance between the first portion 152a and at least one edge of the plate body 161 in the width direction, and there is a predetermined distance between the support block 163 and at least one edge of the plate body 161 in the width direction.

[0308] 29 , in this example, the plate body 161, the first portion 152a, and the support block 163 are projected onto a plane parallel to the first surface 161b, and a first gap is formed between the first portion 152a and at least one edge of the plate body 161 in the width direction, with the width of the first gap being d1. A second gap is formed between the support block 163 and an edge of the plate body 161 in the width direction, with the width of the second gap being d2. The first gap and the second gap may be located on the same side of the plate body 161 in the width direction, or may be located on different sides of the plate body 161 in the width direction. The widths of the first gap and the second gap may be equal or unequal. Taking the example where the first gap and the second gap are located on the same side of the plate body 161 and are equal in width, the gaps formed between the support block 163 and the edge of the plate body 161 and the first portion 152a can be used as fluid passages 164 for airflow, further maintaining relatively good exhaust performance of the exhaust structure 160. The width of the first gap and / or the second gap in this example may be equal to A1 described in the above example.

[0309] 14 and 25, in some examples, the insulating film 150 is folded and wrapped around the electrode assembly 130, forming a first folded edge 150a and a second folded edge 150b that overlap each other on the sides of the electrode assembly 130. The insulating sheet 152 further includes a second portion 152b connected to the first portion 152a, and the second portion 152b secures the first folded edge 150a and the second folded edge 150b.

[0310] In this example, the second portion 152b may be installed integrally with the first portion 152a, or the second portion 152b may be installed separately from the first portion 152a and connected and fixed to the first portion 152a.

[0311] The insulating film 150 is folded and wrapped around the side edges of the electrode assembly 130, forming a first folded edge 150a and a second folded edge 150b at the edge portions of the insulating film 150. The first folded edge 150a and the second folded edge 150b overlap each other and are wrapped around the surfaces of the side edges of the electrode assembly 130 in corresponding portions. The second portion 152b of the insulating sheet 152 is used to connect the first folded edge 150a and the second folded edge 150b, thereby connecting and fixing the first folded edge 150a and the second folded edge 150b to each other and further reducing warping or deformation in the areas of the first folded edge 150a and the second folded edge 150b.

[0312] Referring to FIG. 31, in some examples, the support block 163 is installed separately from the plate body 161, and the second communication hole 165 passes through the support block 163 and the plate body 161.

[0313] The second communication hole 165 passing through the support block 163 and the plate body 161 means that holes are provided in the support block 163 and the plate body 161, respectively, and the hole in the support block 163 and the hole in the plate body 161 together form the second communication hole 165. In this example, when positioning the support block 163 and the plate body 161, the second communication hole 165 can be used to position the support block 163 and the plate body 161, thereby facilitating the positioning and installation of the support block 163 and the plate body 161.

[0314] In this example, the second communication hole 165 faces the first communication hole 151, so when the exhaust structure 160 and the insulating film 150 are positioned and attached to each other, the second communication hole 165 and the first communication hole 151 can be used to position and attach the insulating film 150, the plate body 161, and the support block 163, further improving the attachment performance of the exhaust structure 160.

[0315] In some examples, the support block 163 is installed separately from the plate body 161, and the plate body 161 is connected to the insulating film 150. Connecting the insulating film 150 and the plate body 161 to each other can improve the structural stability of the insulating film 150 and the plate body 161 within the battery cell 110. In this example, the plate body 161 may be connected and fixed to the insulating film 150 by hot melt, adhesive, engagement, or other methods.

[0316] 31 , in some examples, the support block 163 is installed separately from the plate body 161, and the three components of the support block 163, the plate body 161, and the insulating film 150 are connected to each other. In this example, the support block 163 may be connected to the plate body 161 by hot melt, adhesive, engagement, or other methods, and the plate body 161 may be connected and fixed to the insulating film 150 by hot melt, adhesive, engagement, or other methods. This connects the three components of the support block 163, the plate body 161, and the insulating film 150 to form an integrated structure, which further reduces shifting of the exhaust structure 160 and the insulating film 150 inside the battery cell 110 and helps improve the stability of the internal structure of the battery cell 110. In some examples, the support block 163 is hot melt connected to the plate body by a first weld mark 171. The number of first weld marks 171 may be one or more. Optionally, when the support block 163 is hot-melt connected to the plate body by a plurality of first weld marks 171, the plurality of first weld marks 171 are spaced apart, thereby reducing problems of penetration and deformation of the plate body due to the concentration of welding heat. In some examples, the insulating film 150 is hot-melt connected to the plate body 161 by a second weld mark 172. Optionally, the number of second weld marks 172 may be one or more. When the insulating film is hot-melt connected to the plate body by a plurality of second weld marks 172, the plurality of second weld marks 172 are spaced apart, thereby reducing problems of penetration and deformation of the plate body due to the concentration of welding heat.

[0317] In some cases, the support block 163 and the plate body 161 may be hot-melt connected to the insulating film 150 at the same position, which results in higher processing efficiency.

[0318] In some examples, the center of the second communication hole 165 is located on one side of the longitudinal centerline of the plate body 161. Correspondingly, the center of the first communication hole 151 of the insulating film 150 is also located on one side of the longitudinal centerline of the plate body 161. In this example, the second communication hole 165 may have a circular, elliptical, or polygonal hole structure. The plate body 161 has a longitudinal centerline. Because the geometric center of the second communication hole 165 does not overlap with the longitudinal centerline of the plate body 161, the center of the second communication hole 165 does not coincide with the longitudinal centerline of the plate body 161, which further facilitates identification and positioning of the plate body 161 during installation. This allows the second communication hole 165 to provide a mistake-proofing effect and reduce the possibility of incorrect installation.

[0319] When the second communication hole 165 is opened in the bottom wall 163a of the support block 163, the number of support blocks 163 in this example may be multiple, and at least one second communication hole 165 is installed in the bottom wall 163a of each support block 163.

[0320] In some examples, the center of the second communication hole 165 is located on one side of the centerline in the width direction of the plate body 161.

[0321] Correspondingly, the center of the first through hole 151 of the insulating film 150 is also located on one side of the center line in the width direction of the plate body 161 .

[0322] In this example, the plate body 161 has a centerline in the width direction. Because the geometric center of the second communication hole 165 does not overlap with the centerline of the plate body 161 in the width direction, the center of the second communication hole 165 is not located on the centerline of the plate body 161 in the width direction, which further facilitates recognition and positioning of the plate body 161 during installation. As a result, the second communication hole 165 provides a mistake-proofing effect and reduces the possibility of incorrect installation. When the second communication hole 165 is opened in the bottom wall 163a of the support block 163 in this example, there may be multiple support blocks 163, and at least one second communication hole 165 is provided in the bottom wall 163a of each support block 163.

[0323] In some examples, the exhaust structure 160 includes a plurality of second communication holes 165 that are disposed on both sides of the center line in the length direction of the plate body 161 and are asymmetric with respect to the center line in the length direction of the plate body 161.

[0324] Correspondingly, the centers of the plurality of first communication holes 151 of the insulating film 150 are also asymmetric with respect to the center line of the plate body 161 in the longitudinal direction.

[0325] In this example, the exhaust structure 160 has a centerline in the longitudinal direction. Of the multiple second communication holes 165, at least two second communication holes 165 are located on both sides of the centerline in the longitudinal direction of the plate body 161, and the second communication holes 165 located on both sides of the centerline in the longitudinal direction of the plate body 161 are asymmetric with respect to the centerline in the longitudinal direction of the plate body 161. This makes it easier to recognize the plate body 161, provides a poka-yoke effect when installing the plate body 161, and reduces the possibility of incorrect installation. In some examples, the number of second communication holes 165 on both sides of the centerline in the longitudinal direction of the plate body 161 may be equal, and the second communication holes 165 located on both sides of the centerline in the longitudinal direction of the plate body 161 may all be asymmetric with respect to the centerline in the longitudinal direction of the plate body 161, or some of the second communication holes 165 may be asymmetric with respect to the centerline in the longitudinal direction of the plate body 161.

[0326] In some examples, the exhaust structure 160 includes a plurality of second communication holes 165 that are disposed on both sides of the center line in the width direction of the plate body 161 and are asymmetric with respect to the center line in the width direction of the plate body 161.

[0327] Correspondingly, the centers of the plurality of first communication holes 151 of the insulating film 150 are also asymmetric with respect to the center line of the plate body 161 in the width direction.

[0328] In this example, the exhaust structure 160 has a center line in the width direction, and at least two of the multiple second communication holes 165 are located on both sides of the center line in the width direction of the plate body 161, and the second communication holes 165 located on both sides of the center line in the width direction of the plate body 161 are asymmetric with respect to the center line in the width direction of the plate body 161. This makes it easier to recognize the plate body 161, provides a poka-yoke effect when installing the plate body 161, and reduces the possibility of incorrect installation. In some examples, the number of second communication holes 165 on both sides of the center line in the width direction of the plate body 161 may be equal, and all of the second communication holes 165 located on both sides of the center line in the width direction of the plate body 161 may be asymmetric with respect to the center line in the width direction of the plate body 161, or some of the second communication holes 165 may be asymmetric with respect to the center line in the width direction of the plate body 161.

[0329] Referring to FIG. 31, in some examples, the exhaust structure 160 includes a plurality of support blocks 163, and each support block 163 has a second communication hole 165 provided therein.

[0330] In this example, the second communication holes 165 are installed in each of the multiple support blocks 163, and the support blocks 163 can be formed using an integrated mold, which further simplifies the molding mold for the support blocks 163 and reduces the molding costs of the support blocks 163.

[0331] In this example, a second communication hole 165 is installed in each of the multiple support blocks 163, so that the support blocks 163 can be identified by the second communication hole 165, and further, when installing, the possibility of installing a different support block 163 in the wrong position is reduced.

[0332] Referring to Figure 31, taking the example of a single support block 163 being elongated, a second communicating hole 165 is installed in the support block 163, and the center of the second communicating hole 165 is installed on one side of the center line of the support block 163 in the longitudinal direction.

[0333] 25 and 31, in this example, the plurality of support blocks 163 are all provided with second communication holes 165, and the number of first communication holes 151 in the insulating film 150 is smaller than the number of support blocks 163. For example, in a case where the exhaust structure 160 has four support blocks 163, the four support blocks 163 are arranged in two rows and two columns on the plate body 161, and the number of first communication holes 151 in the insulating film 150 may be two, and the positions of the two first communication holes 151 may correspond to the positions of the second communication holes 165 in two of the support blocks 163. In this way, it is possible to prevent the exhaust structure 160 from being installed backwards.

[0334] In some examples, the support block 163 is mounted integrally with the plate body 161 .

[0335] The term "integrally disposed" as used herein may include the support block 163 and the plate body 161 being integrally molded, or may include the support block 163 and the plate body 161 being connected and fixed to each other using an intermediate connector. In this example, when the support block 163 and the plate body 161 are integrally molded, the support block 163 and the plate body 161 can be formed using the same mold, thereby reducing the processing time for the exhaust structure 160 and further improving the processing efficiency of the exhaust structure 160. In this example, when the support block 163 and the plate body 161 are fixed to each other using an intermediate connector to form an integral structure, the intermediate connector is simultaneously connected to the support block 163 and the plate body 161, indirectly connecting the support block 163 and the plate body 161. This allows the support block 163 and the plate body 161 to support and limit each other's positions, thereby improving the structural strength of both.

[0336] In some embodiments, the support block 163 and the plate body 161 can be injection molded as a single unit, which is highly efficient in processing.

[0337] 18 to 22, in some examples, the plate body 161 includes a second surface 161a facing the first surface 161b along the thickness direction of the plate body 161, and a recess 166 is formed on the second surface 161a at a position facing the support block 163.

[0338] In this example, the first surface 161b and the second surface 161a are two opposing surfaces in the thickness direction of the plate body 161, and the first surface 161b may or may not be parallel to the second surface 161a.

[0339] The position of the recess 166 corresponds to the position of the support block 163. This means that when the recess 166 and the support block 163 are projected onto a plane parallel to the second surface 161a, the projections of the recess 166 and the support block 163 at least partially overlap. The recess 166 is an internal recess formed on the second surface 161a. The internal recess forms a recessed space within the plate body 161 on the second surface 161a. This allows airflow on one side of the second surface 161a to flow along the space formed by the internal recess, further increasing the airflow flow area and thereby improving the airflow performance within the battery cell 110. The recess 166 corresponds to the position of the support block 163. The support block 163 provides support for the position of the recess 166 in the thickness direction of the plate body 161, further alleviating the problem of a reduction in the structural strength of the plate body 161 due to the presence of the recess 166. This improves the overall pressure resistance of the plate body 161, reducing the possibility of deformation of the exhaust structure 160 on the premise that the exhaust structure 160 has better exhaust performance.

[0340] The shape and dimensions of the recess 166 in this example may match the shape and dimensions of the support block 163 at the corresponding position, or the shape and dimensions of the recess 166 may not match the shape and dimensions of the support block 163 at the corresponding position, and the depth, dimensions and position of the recess 166 can be determined according to the overall shape of the plate body 161.

[0341] In some examples, the recess 166 extends to the edge of the plate body 161 .

[0342] The recess 166 extending to the edge of the plate body 161 means that the recess 166 has an opening opened at the edge position of the plate body 161, which allows the recess 166 to communicate with the outside of the edge of the plate body 161, so that the airflow outside the edge of the plate body 161 can flow along the passage formed by the recess 166, and the airflow on one side of the second surface 161a of the plate body 161 can also flow along the recess 166 to the edge position of the plate body 161, further increasing the airflow circulation space and improving the airflow circulation performance within the battery cell 110.

[0343] In this example, the recess 166 extending to the edge of the plate body 161 may mean that the recess 166 extends to at least one of the edge in the width direction and the edge in the length direction of the plate body 161. Optionally, the recess 166 may be in communication with the edge in the width direction and the edge position in the length direction of the plate body 161 simultaneously, so that the airflow at the edge position in the length direction of the plate body 161 and the airflow at the edge position in the width direction can flow in opposite directions.

[0344] In this example, optionally, the exterior casing 120 further includes the second wall 122 described in any one of the examples above, and the second gap 161c described in any one of the examples above is formed between the edge in the length direction and the edge in the width direction of the plate body 161 and the second wall 122, and by connecting the recess 166 to the edge position of the plate body 161, the airflow in the recess 166 can flow into the second gap 161c. As a result, the airflow on one side of the second surface 161a of the plate body 161 flows to a predetermined position by passing through the recess 166, the second gap 161c, and the fluid passage 164 in order.

[0345] In this embodiment, the through-hole 162 described in any one of the above embodiments is optionally formed in the plate body 161. The fluid passage 164 is installed on the first surface 161b of the plate body 161, with one end of the through-hole 162 communicating with the recess 166 and the other end of the through-hole 162 communicating with the fluid passage 164. This allows the airflow on one side of the second surface 161a to flow sequentially along the recess 166, the through-hole 162, and the fluid passage 164 to a predetermined position.

[0346] Referring to Figures 18 and 21, in some examples, the support block 163 includes a bottom wall 163a that abuts the first wall 121 and a side wall 163b that has a first through hole 167 that communicates with the recess 166.

[0347] The side walls 163b of the support block 163 are connected to the plate body 161, and the bottom wall 163a of the support block 163 is installed opposite the plate body 161. The bottom wall 163a of the support block 163 abuts against the first wall 121, and is used to provide support for the plate body 161 by the first wall 121 and the support block 163.

[0348] In this example, the bottom wall 163a abuts against the first wall 121, and any wall surface between the bottom wall 163a and the plate body 161 may be a side wall 163b, and the side wall 163b may be a wall surface along the length direction of the support block 163, or may be a wall surface along the width direction of the support block 163.

[0349] The first through-hole 167 is a communicating hole that penetrates the side wall 163b, one end of the first through-hole 167 communicating with the recess 166, and the other end of the first through-hole 167 indirectly communicating with the fluid passage 164 formed by the outer periphery of the support block 163. The recess 166 can form a space for airflow, and therefore the first through-hole 167 in this example can be used to direct the airflow in the recess 166 to the fluid passage 164, and further increase the airflow flow space, thereby improving the airflow flow efficiency within the battery cell 110. Because the recess 166 is provided on the second surface 161a of the plate body 161, when the temperature of one end of the electrode assembly 130 adjacent to the plate body 161 rises, the airflow on the second surface 161a can guide the high-temperature gas at the first end adjacent to the plate body 161 of the electrode assembly 130 to a predetermined position, and the airflow can further reduce the temperature of the one end of the electrode assembly 130 adjacent to the plate body 161. As the temperature of one side of the second surface 161a of the plate body 161 decreases, the possibility of deformation of the one side of the second surface 161a of the plate body 161 can be reduced.

[0350] In this example, the side wall 163b may be disposed perpendicular to the first surface 161b of the plate body 161, or the side wall 163b may be disposed at an angle to the first surface 161b of the plate body 161. The first through hole 167 may be disposed parallel to the first surface 161b of the plate body 161, or the first through hole 167 may be disposed at an angle to the first surface 161b. In this example, the first through hole 167 may be a linear hole, or may have a communicating hole structure such as a tapered hole.

[0351] In this example, the bottom wall 163a may be in direct contact with the first wall 121, or may be indirectly in contact with the first wall 121 via another member such as an insulating sheet 152, so that the first wall 121 is used to provide support for the bottom wall 163a.

[0352] In some examples, the pressure release mechanism 140 is installed in the first wall 121 , and the first through-hole 167 communicates with the recess 166 and the pressure release mechanism 140 .

[0353] The pressure release mechanism 140 is used to release pressure when the pressure inside the battery cell 110 reaches a predetermined value. The pressure release mechanism 140 in this example may be an explosion-proof valve or any other structure that can release pressure when the internal air pressure of the battery cell 110 reaches a predetermined value.

[0354] The first through-holes 167 communicate with the recesses 166 and the pressure release mechanism 140, so that airflow on one side of the second surface 161a of the plate body 161 can flow sequentially along the recesses 166 and the first through-holes 167 toward the pressure release mechanism 140. Optionally, the recesses 166 in this example communicate with at least one of the edges in the length and width directions of the plate body 161, so that airflow at the edge of the plate body 161 can flow along the recesses 166 and the first through-holes 167 toward the pressure release mechanism 140. Optionally, the first through-holes 167 communicate with the fluid passages 164, and the fluid passages 164 communicate with the pressure release mechanism 140, so that airflow within the battery cells 110 can flow toward the pressure release mechanism 140.

[0355] 18 and 21 to 23, in some examples, the support block 163 includes an edge support block 168 mounted on the edge of the plate body 161.

[0356] The edge support blocks 168 may be located at the edges in the length direction of the plate body 161 or at the edges in the width direction of the plate body 161. By installing the edge support blocks 168, the edge positions of the plate body 161 can be supported, thereby reducing the possibility of warping, bending or breaking at the edge positions of the plate body 161, and further improving the structural strength of the edge positions of the plate body 161.

[0357] The shape and dimensions of the edge support block 168 in this example may be the same as the shape and dimensions of the support block 163 described in any one of the above examples, or may be determined according to the shape and dimensions of the plate body 161, so that the edge support block 168 can provide a relatively good support effect for the plate body 161. Optionally, the edge of the plate body 161 is bent toward the surface to form the edge support block 168, and the edge support block 168 may be perpendicular to the first surface 161b of the plate body 161, or may be installed at an angle to the first surface 161b of the plate body 161.

[0358] In some examples, referring to FIG. 22, a recess 166 is formed in the second surface 161a at a position facing the edge support block 168, and the recess 166 extends to at least the edge of the plate body 161 in the width direction.

[0359] In this example, the recess 166 is provided at an edge position of the second surface 161a close to the plate body 161, and the recess 166 also corresponds to the position of the edge support block 168, so that the airflow at the position corresponding to the edge support block 168 of the plate body 161 can flow along the recess 166, further improving the gas flow performance at the edge position of the plate body 161.

[0360] The recesses 166 in this example extend along the edges of the plate body 161 in the width direction, and allow the airflow at the edge positions in the width direction of the plate body 161 to flow along the recesses 166 to a preset position.

[0361] The recesses 166 may extend along the longitudinal edges of the plate body 161 .

[0362] Referring to FIG. 21, in some examples, a second through hole 168a is opened in the edge support block 168, and the second through hole 168a penetrates the edge support block 168 along a direction intersecting the thickness direction of the first wall 121.

[0363] The second through hole 168a is a through hole that penetrates the edge support block 168 and is used to communicate with the recess 166 corresponding to the position of the edge support block 168, so that the air flow at the position corresponding to the edge support block 168 can flow along the second through hole 168a to a predetermined position.

[0364] In some examples, an edge of the plate body 161 is bent toward the first surface 161b to form an edge support block 168. The edge support block 168 includes a first support portion 168b and a second support portion 168c connected to the first support portion 168b, where the first support portion 168b is connected to the plate body 161 and the second support portion 168c is connected to an end of the first support portion 168b that is remote from the plate body 161. Optionally, a second through-hole 168a is formed in the first support portion 168b. The second through-hole 168a in the first support portion 168b can correspond to the location of the pressure release mechanism 140.

[0365] In this example, the second through-holes 168a can be used to form airflow passages at the edges of the plate body 161, thereby improving the airflow efficiency at the edge areas of the plate body 161.

[0366] In this example, the extension direction of the second through hole 168a intersects with the thickness direction of the first wall 121, i.e., the extension direction of the second through hole 168a is not parallel to the thickness direction of the first wall 121. Optionally, the extension direction of the second through hole 168a is set perpendicular to the thickness direction of the first wall 121.

[0367] Furthermore, in some examples, an air flow passage is formed on the outer periphery of the edge support block 168, and the second through hole 168a is connected to the air flow passage, so that the air flow on one side of the second surface 161a of the plate body 161 can flow sequentially along the recess 166, the second through hole 168a, and the air flow passage to a predetermined position.

[0368] In some examples, the pressure relief mechanism 140 is installed on the first wall 121 and the second through-hole 168 a is installed opposite the pressure relief mechanism 140 .

[0369] The second through-hole 168a being arranged opposite the pressure release mechanism 140 may mean that the second through-hole 168a is arranged opposite the pressure release mechanism 140 in the width direction of the first wall.

[0370] In this example, the second through-hole 168a is disposed opposite the pressure relief mechanism 140, so that airflow can flow toward the pressure relief mechanism 140 through the second through-hole 168a.

[0371] Optionally, an airflow passage is formed on the outer periphery of the edge support block 168, and the second through-hole 168a communicates with the airflow passage, so that the airflow on one side of the second surface 161a of the plate body 161 can flow sequentially through the recess 166, the second through-hole 168a, and the airflow passage to the pressure release mechanism 140. This improves the gas flow performance of the battery cell 110, and further allows the battery cell 110 to release pressure when necessary, thereby improving the reliability of the battery cell 110.

[0372] In some examples, referring to FIG. 24, the support block 163 is installed separately from the plate body 161, and the support block 163 is fixed to the plate body 161.

[0373] The support block 163 being installed separately from the plate body 161 means that the support block 163 and the plate body 161 may be formed separately. The support block 163 being fixed to the plate body 161 means that the support block 163 is directly connected to the plate body 161, or that the support block 163 and the plate body 161 are connected and fixed to each other via an intermediate connecting member.

[0374] In this example, the support block 163 is installed separately from the plate body 161, which makes it easy to form the support block 163 and the plate body 161, and thereby simplifies the forming process of the support block 163 and the plate body 161. In addition, the support block 163 is fixed to the plate body 161 and is prevented from moving relative to the plate body 161, so that the support block 163 provides a support effect for the plate body 161 in a predetermined manner, which further allows the plate body 161 to maintain a predetermined structural stability and reduces the possibility of deformation of the plate body 161.

[0375] Furthermore, the support block 163 and the plate body 161 are separately installed, which can meet different needs, for example, a relatively thin plate body 161 or a relatively thick support block 163 can be manufactured.

[0376] Referring to FIG. 24, in some examples, the edge of the support block 163 and the edge of the plate body 161 have a preset distance.

[0377] In this example, the fact that the support block 163 and the edge of the plate body 161 have a predetermined distance means that the support block 163 and the plate body 161 are projected onto a plane parallel to the first surface 161b of the plate body 161, and there is a gap between the edge position of the support block 163 and the corresponding edge position of the plate body 161, so that the edge of the support block 163 and the edge of the plate body 161 have a predetermined distance.

[0378] In this example, by forming a predetermined distance between the edge of the support block 163 and the edge of the plate body 161, a fluid passage 164 for circulating air can be formed in the gap between the edge of the support block 163 and the edge of the plate body 161, and the gas flow performance at the edge position of the exhaust structure 160 can be further improved.

[0379] In this example, the specific width of the preset distance between the edge of the support block 163 and the edge of the plate body 161 can be determined according to the specific dimensions, shapes, and relative positions of the plate body 161 and the support blocks 163. When multiple rows and columns of support blocks 163 are installed on the plate body 161, the support blocks 163 and the plate body 161 are projected onto a plane parallel to the first surface 161b, and the gap between the edge of the support block 163 and the edge of the plate body 161 refers to the gap formed between the support block 163 and the edge position of the adjacent plate body 161. The edge of the plate body 161 may be an edge in the width direction of the plate body 161 or an edge in the length direction of the plate body 161.

[0380] Referring to FIG. 30, in some examples, the edge of the support block 163 and the edge of the plate body 161 have a preset distance in the width direction of the plate body 161 .

[0381] The fact that the edge of the support block 163 and the edge of the plate body 161 have a predetermined distance in the width direction of the plate body 161 means that when the plate body 161 and the support block 163 are projected onto a plane parallel to the first surface 161b of the plate body 161, there is a gap between the edge of the support block 163 and the corresponding edge of the plate body 161, and this gap can be used to form an airflow passage, so that the air flows to a predetermined position along the edge position in the width direction of the plate body 161, further improving the gas flow performance within the battery cell 110.

[0382] In this example, the size of the distance between the edge of the support block 163 and the edge of the plate body 161 on the corresponding side in the width direction of the plate body 161 can be determined according to the specific conditions of the plate body 161 and the support block 163. 4 and 30 , the support block 163 has an elongated shape, and the longitudinal direction of the support block 163 may be parallel to the longitudinal direction of the plate body. The length of the plate body is L0, and the length of the support block 163 is L1. In this example, L1 is equal to or greater than 0.25L0, the length of the first wall 121 is L, and the width of the plate body 161 in this example is A0, where L0≦L. By making the width of the plate body 161 equal to or less than the width of the first wall 121, the plate body 161 can isolate the first wall 121 from the electrode assembly 130. In this example, if the length L1 of the support block 163 is too small, the length of the support block 163 becomes too small, which is likely to cause stress concentration in the plate body 161 and further reduces the structural strength of the exhaust structure 160. When the exhaust structure 160 supports the electrode assembly 130, the plate body 161 is likely to deform. For example, L1 may be 0.3L0, 0.4L0, 0.5L0, 0.6L0, 0.7L0, 0.8L0, 0.9L0, L0. Optionally, the length L1 of the support block 163 in this example is equal to or greater than 0.3L0.

[0383] Optionally, the length L1 of the support block 163 is set to 0.4L0 or less to reduce the occupancy of the flow passage.

[0384] In some embodiments, the length of the support block 163 is parallel to the length of the plate body.

[0385] Further optionally, a pressure release mechanism 140 as described in any one of the above examples is installed on the first wall 121, and in this example, the support block 163 and the pressure release mechanism 140 are installed offset from each other so that the support block 163 does not occupy the space of the pressure release mechanism 140, thereby reducing the possibility that the support block 163 will press against the pressure release mechanism 140.

[0386] Optionally, four support blocks 163 are installed on one side of the first surface 161b of the plate body 161, and the lengths of the four support blocks 163 are L1, L2, L3, and L4, respectively. The lengths of the four support blocks 163 may be equal or unequal. The four support blocks 163 may be arranged in two rows and two columns on the plate body 161, and the four support blocks 163 and the pressure release structure are offset from each other. Optionally, two of the support blocks 163 are installed at both ends in the longitudinal direction of the plate body 161, thereby reducing the possibility of edge deformation of the plate body 161 in the longitudinal direction and providing support for the electrode assembly 130, thereby reducing edge deformation of the electrode assembly 130.

[0387] In some examples, referring to FIG. 30, the width of the plate body 161 is A0, and the overall width of the support block 163 along the width direction of the plate body 161 is not less than 0.2A0 and not more than 0.8A0.

[0388] For example, the overall width of the support block 163 is 0.2A0, 0.3A0, 0.4A0, 0.5A0, 0.6A0, 0.7A0, 0.8A0.

[0389] If the overall width of the support block 163 is made too small, the contact surface between the plate body 161 and the support block 163 becomes narrow, and stress concentration makes the plate body 161 more likely to deform. If the overall width of the support block 163 is made too large, the width of the fluid passage 164 formed by the outer periphery of the support block 163 becomes relatively small, which may further reduce the exhaust performance of the exhaust structure 160. Optionally, in this example, the overall width of the support block 163 is 0.3 A or more and 0.6 A or less.

[0390] When there is one support block 163 along the width direction of the plate body 161, the overall width of the support block 163 is the width of the support block 163.

[0391] Referring to FIG. 30 , in some examples, the number of support blocks 163 is multiple, and the multiple support blocks 163 are spaced apart along the width direction of the plate body 161. In this example, the total width of the support blocks 163 is greater than or equal to 0.2A and less than or equal to 0.8A, and may be 0.2A, 0.5A, 0.6A, 0.8A, or any other value within the above range. Furthermore, the total width of the support blocks 163 is greater than or equal to 0.3A and less than or equal to 0.6A. In this example, the total width of the support blocks 163 is the sum of the widths of the multiple support blocks 163 along the width direction of the plate body 161. For example, for two support blocks 163, the widths of both support blocks 163 may be A2, and the total width of the support blocks 163 is 2A2. Optionally, the widths of the multiple support blocks 163 in this example may not be equal.

[0392] Alternatively, the distance between the two support blocks 163 is A3, the distance between the edge of one of the support blocks 163 and the edge of the corresponding side of the plate body 161 is A1, and the distance between the edge of the other support block 163 and the edge of the corresponding side of the plate body 161 is A5.

[0393] Referring to FIG. 31, in some examples, the support block 163 is hot melted to the plate body 161.

[0394] In this example, the support block 163 is connected to the plate body 161 using hot melt, which facilitates quick connection between the support block 163 and the plate body 161. The weld marks 170 formed by hot melt are used to form the support block 163 and the plate body 161 into an integral structure, which helps to improve the structural strength of the exhaust structure 160.

[0395] In this example, the entire end surface of one side of the support block 163 facing the plate body 161 may be hot melt connected to the corresponding position on the plate body 161, or multiple portions may be selected from the end surface of one side of the support block 163 facing the plate body 161 and welded respectively to form multiple weld marks 170.

[0396] In some examples, a plurality of support blocks 163 are installed, and a plurality of weld marks 170 are formed on each support block 163 and the plate body 161 .

[0397] In this example, by using multiple welds 170 to connect the support block 163 to the plate body 161, the connection locations between the support block 163 and the plate body 161 are relatively dispersed, and when welding, the positions of the weld points between the support block 163 and the plate body 161 are dispersed, reducing the problem of excessively high local temperatures in the support block 163 and the plate body 161 due to excessive concentration of weld points and further reducing penetration deformation of the plate body 161 and the support block 163. In this example, the multiple welds 170 may be spaced apart along the length of the support block 163, thereby improving the structural strength of the connection location between the support block 163 and the plate body 161 and making full use of the space in the length of the support block 163.

[0398] In some examples, the hot melt welding marks 170 of the support block 163 are exposed on the surface of the plate body 161 away from the support block 163, and the ends of the support block 163 are completely hot melt welded to the plate body 161, thereby increasing the contact area between the support block 163 and the plate body 161 and improving the connection strength between the support block 163 and the plate body 161. In this example, when the support block 163 is provided on one side of the first surface 161b of the plate body 161, the hot melt welding marks 170 of the support block 163 are exposed on one side of the second surface 161a of the plate body 161.

[0399] In some examples, the thickness of the plate body 161 is made smaller than the thickness of the support block 163, thereby reducing the overall thickness of the exhaust structure 160. Reducing the overall thickness of the exhaust structure 160 can help reduce the space occupied by the exhaust structure 160 inside the battery cell 110, and can further facilitate improving the energy density of the battery cell 110.

[0400] In this example, by making the thickness of the plate body 161 smaller than the thickness of the support block 163, hot melt can be easily applied to one side of the plate body 161, which has a relatively small thickness. Since the thickness of the plate body 161 is small, the equipment power required for hot melting is reduced, which helps to reduce processing costs.

[0401] Referring to FIG. 21 , in this example, the thicknesses of the plate body 161 and the support block 163 can be selected according to a specific scenario. The thickness of the support block 163 in this example may be equal to the depth of the fluid passage 164 described in any one of the above examples. Optionally, the thickness of the plate body 161 is H, and H is 0.05 mm or more and 1.0 mm or less along the thickness direction of the plate body 161. In some examples, H is 0.2 mm or more and 0.4 mm or less. The thickness H0 of the support block 163 may be the depth H0 of the fluid passage. In some examples, the thickness H0 of the support block 163 is 0.1 mm or more and 5 mm or less. Optionally, in some examples, H0 is 0.2 mm or more and 0.8 mm or less.

[0402] Referring to FIG. 3, in some examples, the battery cell 110 further includes a pressure relief mechanism 140 provided in the first wall 121, and the fluid passage 164 is used to allow airflow in the internal cavity to flow to the pressure relief mechanism 140.

[0403] The pressure release mechanism 140 in this example is used to release pressure to the outside when the air pressure inside the battery cell 110 reaches a predetermined value. The pressure release mechanism 140 may be an explosion-proof valve. The pressure release mechanism 140 is attached to the first wall 121, so that the battery cell 110 can release pressure through one side of the first wall 121.

[0404] The pressure release mechanism 140 and the first wall 121 may be an integral structure or may be separate structures. When the pressure release mechanism 140 and the first wall 121 are an integral structure, the pressure release mechanism 140 may be a thinned area in the thickness of the first wall 121 or a notch provided in the first wall 121. When the pressure release mechanism 140 and the first wall 121 are separate structures, a hole is provided in the first wall 121, and the pressure release mechanism 140 is connected to the first wall 121 by welding or the like to cover the hole.

[0405] The exhaust structure 160 in this example is installed between the first wall 121 and the electrode assembly 130. A fluid passage 164 is installed in the exhaust structure 160, and the fluid passage 164 forms a space for gas flow. This allows the gas to flow along the fluid passage 164 to the pressure release mechanism 140, and further allows the battery cell 110 to release pressure in a timely manner when necessary.

[0406] Referring to Figures 4, 32 and 33, in some examples, the exhaust structure 160 includes a plate body 161 and a support block 163 installed on one side of the plate body 161 facing the first wall 121, wherein a fluid passage 164 is formed around the support block 163, and the projection of the support block 163 on the first wall 121 does not overlap with the pressure release mechanism 140.

[0407] In this example, the plate body 161 serves as the main structure of the exhaust structure 160 and separates the first wall 121 from the electrode assembly 130. The plate body 161 has a first surface 161b facing the first wall 121 and a second surface 161a facing the electrode assembly 130. A support block 163 is installed on one side of the first surface 161b of the plate body 161. The support block 163 may be installed integrally with the plate body 161 or may be installed separately from the plate body 161. When the support block 163 is installed separately from the plate body 161, the support block 163 may be connected to and fixed to the plate body 161, or may not be connected to and fixed to the plate body 161.

[0408] The fact that the projection of the support block 163 on the first wall 121 does not overlap with the pressure release mechanism 140 means that the projection of the support block 163 on the first wall 121 is offset from the pressure release mechanism 140, thereby reducing the pressure on the pressure release mechanism 140 by the support block 163.

[0409] The support block 163 spans the plate body 161 on one side of the first wall 121 facing the electrode assembly 130, and a fluid passage 164 is formed around the support block 163, allowing gas to flow between the plate body 161 and the first wall 121. Because the pressure release mechanism 140 is installed in the first wall 121, when the air pressure inside the battery cell 110 reaches a predetermined value, air can flow through the fluid passage 164 toward the pressure release mechanism, and the pressure in the battery cell 110 can be released in a timely manner, thereby improving the reliability of the battery cell 110.

[0410] In this example, the number of support blocks 163 may be one, and the fluid passage 164 may be formed on the outer periphery of the support block 163. In this example, the number of support blocks 163 may be multiple, and the fluid passage 164 may be formed between adjacent support blocks 163.

[0411] 4, 32 and 33, in some examples, a reinforcing rib 180 is provided on the plate body 161 at a position opposite the pressure release mechanism 140.

[0412] The presence of the reinforcing rib 180 at a position on the plate body 161 facing the pressure release mechanism 140 means that when the plate body 161 is projected onto the first wall 121, the reinforcing rib 180 overlaps with at least a portion of the pressure release mechanism 140. In this example, the reinforcing rib 180 may be a convex rib provided on at least one of the first surface 161b and the second surface 161a of the plate body 161, and the shape of the reinforcing rib 180 may be substantially cross-shaped or may have other shapes. In this example, the provision of the reinforcing rib 180 can improve the structural strength of the position of the plate body 161 corresponding to the pressure release mechanism 140, and further improve the deformation resistance of the plate body 161.

[0413] 4, 32 and 33, in some examples, the reinforcing rib 180 is located on one side of the plate body 161 facing the first wall 121.

[0414] In this example, the reinforcing ribs 180 are provided on the first surface 161b of the plate body 161. The second surface 161a of the plate body 161 faces the electrode assembly 130, and the reinforcing ribs 180 are used to provide a reinforcement effect to the plate body 161. At the same time, the reinforcing ribs 180 are installed away from the electrode assembly 130, so that the reinforcing ribs 180 do not generate any acting force on the electrode assembly 130, thereby reducing damage to the electrode assembly 130 due to the reinforcing ribs 180 pressing against the electrode assembly 130.

[0415] 33 , in some examples, the reinforcing ribs 180 extend to the edges of the plate body 161, thereby allowing the reinforcing ribs 180 to have a reinforcing effect at the edge positions of the plate body 161. In this example, the reinforcing ribs 180 may extend to the edge positions in the width direction of the plate body 161, or may extend to the edge positions in the length direction of the plate body 161.

[0416] Referring to FIG. 33, in some examples, the reinforcing rib 180 extends to an adjacent support block 163, forming the entire structure between the reinforcing rib 180 and the adjacent support block 163, and further allowing the reinforcing rib 180 and the support block 163 to have a supporting effect on each other, thereby improving the overall strength of the exhaust structure 160.

[0417] In some examples, the reinforcing ribs 180 extend to the edges of the plate body 161, and the reinforcing ribs 180 extend to the adjacent support blocks 163, thereby improving the overall structural strength of the exhaust structure 160, making it easier to integrally mold the reinforcing ribs 180, the support blocks 163, and the plate body 161 during molding, and further simplifying the molding equipment and process for the exhaust structure 160. Optionally, in this example, the support blocks 163 are located on both sides of the reinforcing ribs 180 in the length direction of the plate body 161, and the extending portions of the reinforcing ribs 180 along the length direction of the plate body 161 can extend to the positions of the support blocks 163 on both sides, and the extending portions of the reinforcing ribs 180 along the width direction of the plate body 161 can extend to the edge positions in the width direction of the plate body 161.

[0418] 34 , in some examples, the height of the reinforcing rib 180 in the thickness direction of the first wall 121 can be made smaller than the height of the support block 163, so that the reinforcing rib 180 does not contact the first wall 121 when the exhaust structure 160 is in a normal state. The reinforcing rib 180 is installed corresponding to the pressure release mechanism 140, so that the support block 163 can abut against the first wall 121. When the height of the reinforcing rib 180 is smaller than the height of the support block 163, the reinforcing rib 180 does not press the pressure release mechanism 140, thereby reducing the risk of the pressure release mechanism 140 falling off due to the force of the reinforcing rib 180 acting on the pressure release mechanism 140.

[0419] In some examples, by arranging the reinforcing ribs 180 integrally with the plate body 161, the reinforcing ribs 180 can be molded integrally with the plate body 161, further improving the processing performance of the exhaust structure 160. By arranging them integrally, the connection strength of the connection portion between the reinforcing ribs 180 and the plate body 161 can be improved, and the structural strength of the exhaust structure 160 can be improved.

[0420] In some examples, the reinforcing rib 180 is provided separately from the plate body 161 and then connected to each other. In this example, the reinforcing rib 180 and the plate body 161 may be formed separately, and the reinforcing rib 180 and the plate body 161 may be connected and fixed to each other. The reinforcing rib 180 and the plate body 161 may be connected to each other by welding or engagement, or an intermediate connecting member such as a bolt or a pin may be used to connect and fix the reinforcing rib 180 and the plate body 161 to each other, or any other structure that can connect and fix the reinforcing rib 180 and the plate body 161 to each other may be used as the intermediate connecting member.

[0421] Referring to FIG. 35, in some examples, the exhaust structure 160 includes a plate body 161 including a first surface 161b disposed along the thickness direction of the plate body 161, and the fluid passage 164 is a groove 169 disposed in the first surface 161b.

[0422] In this example, the fluid passage 164 may be one or more grooves 169 recessed in the first surface 161b, and the fluid passage 164 is used to form a space for airflow on one side of the first surface 161b of the exhaust structure 160. The fluid passage 164 in this example can communicate with the edge of the plate body 161 in the first direction, and the first direction and the thickness direction of the first wall 121 are arranged at an angle, and optionally, the first direction is arranged perpendicular to the thickness direction of the first wall 121.

[0423] In this example, the fluid passage 164 formed by the groove 169 is used, which facilitates processing and forming of the fluid passage 164, thereby improving the processing performance of the exhaust structure 160. Optionally, in some examples, the plate body 161 further has a second surface 161a disposed opposite to the first surface 161b, and a through hole 162 is formed in the plate body 161 along the thickness direction of the plate body 161. The through hole 162 is used to communicate with the second surface 161a of the plate body 161 and the fluid passage 164, so that the airflow on one side of the second surface 161a of the plate body 161 flows to one side of the first surface 161b.

[0424] Referring to FIG. 36, in some examples, the exhaust structure 160 includes a plurality of spaced apart sub-exhaust structures 1601, with fluid passages 164 formed between adjacent sub-exhaust structures 1601.

[0425] In this example, the multiple sub-exhaust structures 1601 are arranged and combined to form the exhaust structure 160, and the multiple sub-exhaust structures 1601 may have the same shape and size, or may have different shapes and sizes. Fluid passages 164 for guiding airflow may be formed between adjacent sub-exhaust structures 1601. In this example, combining the multiple sub-exhaust structures 1601 to form the exhaust structure 160 makes it easy to form the exhaust structure 160 by splicing and combining them according to the specific shape and size of the battery cell 110. In addition, the multiple sub-exhaust structures 1601 can be molded separately, thereby improving the processability of the sub-exhaust structures 1601.

[0426] In this example, the plurality of sub-exhaust structures 1601 may be installed independently of each other, or the plurality of sub-exhaust structures 1601 may be connected and fixed to each other by connecting members.

[0427] In some examples, the battery cell 110 further includes an insulating film 150 wrapped around the outer periphery of the electrode assembly 130, and the insulating film 150 is connected to the sub-exhaust structure 1601.

[0428] The insulating film 150 is used to provide isolation between the electrode assembly 130 and the exterior casing 120, thereby reducing contact between the electrode assembly 130 and the exterior casing 120. The insulating film 150 is connected to the sub-exhaust structure 1601 and provides a positional restriction for the sub-exhaust structure 1601, so that the sub-exhaust structure 1601 can be fixed in a preset position.

[0429] The insulating film 150 in this example can be connected and fixed to the sub-exhaust structure 1601 by hot melt or other methods.

[0430] 3, 6 and 14, in some examples, the exterior casing 120 includes a second wall 122 that includes a second sub-wall 122a on which an electrode terminal 122b is located.

[0431] In this example, the second wall 122 is a wall surface of the exterior casing 120 other than the first wall 121. The second sub-wall 122a is a portion of the wall surface of the second wall 122. The second sub-wall 122a may be a wall surface installed opposite the first wall 121, or the second sub-wall 122a may be a wall surface installed adjacent to the first wall 121. For example, if the first wall 121 is the bottom wall 163a of the exterior casing 120, the second wall 122 may be a side wall or a top wall of the exterior casing 120.

[0432] The electrode terminal 122b in this example is used to electrically connect to the electrode assembly 130 and may be used for charging and discharging operations of the battery cell 110. By placing the electrode terminal 122b on the second sub-wall 122a, it is easy to offset the electrode terminal 122b and the pressure release mechanism 140 from each other, and further reduce mutual interference between the electrode terminal 122b and the pressure release mechanism 140. Optionally, the electrode terminal 122b in this example can be connected to the tab 131 by a current collecting part 133.

[0433] In some examples, the second sub-wall 122a faces the first wall 121, and the electrode terminal 122b and the pressure release mechanism 140 are located on two opposing walls of the exterior casing 120, respectively, to completely offset the electrode terminal 122b and the pressure release mechanism 140, thereby reducing mutual interference between them. In this example, the second sub-wall 122a and the first wall 121 may be the upper and lower two walls of the exterior casing 120, respectively, or the second sub-wall 122a and the first wall 121 may be other walls of the exterior casing 120, respectively.

[0434] In some examples, the second sub-wall 122a is connected to the first wall 121, and the second sub-wall 122a is disposed adjacent to the first wall 121. The electrode terminal 122b disposed on the second sub-wall 122a and the pressure release mechanism 140 disposed on the first wall 121 face different directions of the battery cell 110, thereby reducing mutual interference between the electrode terminal 122b and the pressure release mechanism 140.

[0435] In some examples, the electrode assembly 130 includes a tab 131 facing the second sub-wall 122a. The tab 131 in this example is used to connect to the electrode terminal 122b, and is thereby used for charging and discharging the battery cell 110.

[0436] Since the second sub-wall 122a and the first wall 121 are offset from each other, mutual interference between the tab 131 and the pressure release mechanism 140 can be reduced and it becomes easier to connect the tab 131 to the adjacent electrode terminal 122b.

[0437] In some examples, the second sub-wall 122a is an end cap. In this example, using the second sub-wall 122a as an end cap makes it easier to attach the electrode terminal 122b. The end cap may be a top wall or a side wall of the battery cell 110. Two end caps may be provided, and as shown in FIG. 6, two end caps are attached to the positive electrode terminal and the negative electrode terminal, respectively. One end cap may also be provided, and as shown in FIG. 3, the positive electrode terminal and the negative electrode terminal may be attached to one end cap.

[0438] The present application further proposes an example of the battery 100 based on the above battery cell 110. The battery 100 includes the battery cell 110 described in any one of the above examples.

[0439] The battery 100 in this example may include a case 190, and the battery cells 110 are mounted in the case 190. The battery 100 may include one battery cell 110 or multiple battery cells 110. When multiple battery cells 110 are installed in the battery 100, the multiple battery cells 110 may be arranged according to a preset rule. The multiple battery cells 110 may be arranged in one row and multiple columns, or multiple rows and multiple columns. The multiple battery cells 110 may be connected to each other in series, parallel, or a mixed series-parallel connection.

[0440] This example merely describes the battery 100 including the battery cell 110, and it is understood that the battery 100 may further include other functional components, the description of which will be omitted.

[0441] The example of the battery 100 in this application is an example based on the above battery cell 110, and the example of the battery 100 includes all the technical effects of the example of the above battery cell 110, and the description thereof will be omitted.

[0442] In some examples, an example of an electrical device 1000 is disclosed, where the electrical device 1000 includes a battery cell 110 as described in any one of the examples above, or a battery 100 as described in any one of the examples above.

[0443] The electric device 1000 in this example includes, but is not limited to, a mobile phone, a portable device, a laptop, an electric scooter, an electric vehicle, a boat, a spacecraft, an electric toy, and an electric tool, and the electric device 1000 may be equipped with the battery cell 110 described in any one of the above examples alone, or the electric device 1000 may be equipped with the battery 100 described above.

[0444] The example of the electric device 1000 in this application is an example based on the above battery cell 110 or battery 100, and the example of the electric device 1000 includes all the technical effects of the example of the above battery cell 110 or battery 100, and the description thereof will be omitted.

[0445] In one example of the present application, a battery cell 110 is disclosed that includes an exterior casing 120, an electrode assembly 130 installed in the exterior casing 120, and an exhaust structure 160. The exterior casing 120 has a first wall 121 in which a pressure release mechanism 140 is installed. The exhaust structure 160 is provided between the first wall 121 and the electrode assembly 130, bridges the electrode assembly 130 to the outside of the first wall 121, and is used to block movement from the electrode assembly 130 in the direction of the first wall 121. The exhaust structure 160 is provided with a fluid passage 164 that communicates with the pressure release structure, thereby allowing gas inside the battery cell 110 to flow in the direction of the pressure release mechanism 140. In this example, by installing the exhaust structure 160, when the battery cell 110 experiences thermal runaway, the airflow inside the battery cell 110 can flow along the fluid passage 164 toward the pressure release mechanism 140, which can then be opened in a timely manner to release pressure on the battery cell 110, thereby reducing the risk of the battery cell 110 exploding due to thermal runaway. The fluid passage 164 in this example is connected to the outer periphery of the electrode assembly 130 and the pressure release mechanism 140, allowing the airflow outside the electrode assembly 130 to flow toward the pressure release mechanism 140, thereby reducing the temperature of the outer periphery of the electrode assembly 130. The fluid passage 164 is further used to connect the outer periphery of the exhaust structure 160 and the pressure release mechanism 140, allowing the airflow around the outer periphery of the exhaust structure 160 to flow along the fluid passage 164 to the pressure release mechanism 140. Optionally, the exhaust structure 160 in this example includes a plate body 161 and a support block 163, of which the plate body 161 is disposed between the electrode assembly 130 and the first wall 121, the support block 163 may be disposed on one side of the plate body 161 facing the first wall 121, and the fluid passage 164 may be formed on the outer periphery of the support block 163, thereby forming a space for gas flow on the one side of the plate body 161 facing the first wall 121. The plate body 161 in this example may further include a through hole 162 that penetrates the plate body 161 and communicates with the fluid passage 164 and the one side of the plate body 161 facing the electrode assembly 130.The battery cell 110 in this example may further include an insulating film 150 wrapped around the electrode assembly 130, thereby providing insulation between the electrode assembly 130 and the outer casing 120. The insulating film 150 may be connected to a plate body 161, thereby allowing the exhaust structure 160 and the insulating film 150 to be maintained in a predetermined position. To facilitate installation, in this example, a first communication hole 151 is provided in the insulating film 150, a second communication hole 165 is provided in the exhaust structure 160, and the first communication hole 151 and the second communication hole 165 are arranged opposite each other, thereby allowing the insulating film 150 and the exhaust structure 160 to be positioned. When the second communication hole 165 is installed in the support block 163 of the exhaust structure 160, the battery cell 110 may further include an insulating sheet 152, which blocks the second communication hole 165 and thereby prevents powder from moving to the second communication hole 165.

[0446] The above description is merely a selection of examples of the present application and does not limit the scope of the claims of the present application. Equivalent structural transformations made using the contents of the specification and drawings of the present application under the concept of the present invention, or those directly or indirectly applied to other related technical fields, are all within the scope of the claims of the present application.

Claims

1. A battery cell, an outer casing having an interior cavity and a first wall; an electrode assembly disposed in the internal cavity; an exhaust structure disposed between the first wall and the electrode assembly, the exhaust structure having a fluid passage therethrough; Battery cell.

2. the fluid passage communicates with an edge of the exhaust structure in a first direction, the first direction intersecting a thickness direction of the first wall; The battery cell according to claim 1 .

3. the outer casing includes a second wall, a first gap is formed between an outer circumferential surface of the electrode assembly and the second wall, and the fluid passage communicates with the first gap; and / or a second gap is formed between an outer circumferential surface of the exhaust structure and the second wall of the outer casing, and the fluid passage communicates with the second gap. The battery cell according to claim 2 .

4. The exhaust structure includes a plate body, the plate body including a first surface disposed along a thickness direction of the plate body, and the fluid passage is disposed on the first surface. The battery cell according to claim 2 or 3.

5. a support block is provided on the first surface, and the fluid passage is formed around the support block; The battery cell according to claim 4 .

6. A plurality of support blocks are provided on the first surface, and the fluid passage is formed between the plurality of support blocks. The battery cell according to claim 5 .

7. The plurality of support blocks include: a plurality of the support blocks are arranged in an array; a plurality of the support blocks are arranged along the width direction of the plate body; a plurality of the support blocks are arranged along the length direction of the plate body; The support block is a rectangular block or a cylindrical block. The battery cell according to claim 6 .

8. a through hole is provided in the plate body, the through hole penetrates the plate body along the thickness direction of the plate body and communicates with the fluid passage; The battery cell according to any one of claims 5 to 7.

9. At least some of the through holes are arranged alternately with the support blocks. The battery cell of claim 8 .

10. The support blocks have a plurality of rows, and the through holes are disposed between two adjacent rows of the support blocks. The battery cell of claim 9 .

11. the first surface faces the first wall; The battery cell according to any one of claims 5 to 10.

12. The battery cell further includes an insulating film wrapped around the outer periphery of the electrode assembly, the insulating film having a first communication hole, the exhaust structure being disposed between the insulating film and the first wall, and the exhaust structure having a second communication hole facing the first communication hole. The battery cell of claim 11 .

13. The second communication hole is installed in the support block. The battery cell of claim 12.

14. the support block has a hollow structure protruding opposite to the plate body, the second communication hole is provided in a bottom wall of the support block, and the bottom wall of the support block abuts against the first wall; The battery cell of claim 13 .

15. The battery cell further includes an insulating sheet, the insulating sheet including a first portion, at least a portion of which is disposed on one side of the exhaust structure away from the electrode assembly and covers the second communication hole. The battery cell according to any one of claims 12 to 14.

16. the first portion is in close contact with the opening of the second communication hole; The battery cell of claim 15.

17. a predetermined distance between the first portion and at least one edge of the plate body in the width direction; and / or a predetermined distance is provided between the support block and at least one edge of the plate body in the width direction of the plate body; The battery cell according to claim 15 or 16.

18. the insulating film is folded and wrapped around the electrode assembly, and a first folded edge and a second folded edge that overlap each other are formed on sides of the electrode assembly; the insulating sheet further includes a second portion, the second portion being connected to the first portion and fixing the first folded edge and the second folded edge; The battery cell according to any one of claims 15 to 17.

19. the support block is installed separately from the plate body, and the second communication hole penetrates the support block and the plate body. The battery cell according to any one of claims 12 to 18.

20. The support block is installed separately from the plate body, the plate body is connected to the insulating film, or the support block, the plate body and the insulating film are connected to each other; The battery cell according to any one of claims 15 to 18.

21. The center of the second communication hole is located on one side of the center line in the longitudinal direction of the plate body, or The center of the second communication hole is located on one side of the center line in the width direction of the plate body, or The exhaust structure includes a plurality of the second communication holes, the plurality of second communication holes are respectively installed on both sides of a center line in the longitudinal direction of the plate body, and the plurality of second communication holes are asymmetric with respect to the center line in the longitudinal direction of the plate body, or The exhaust structure includes a plurality of the second communication holes, the plurality of second communication holes being disposed on both sides of a center line in the width direction of the plate body, and the plurality of second communication holes being asymmetric with respect to the center line in the width direction of the plate body. The battery cell according to any one of claims 12 to 20.

22. the exhaust structure includes a plurality of the support blocks, and each of the support blocks is provided with the second communication hole. The battery cell according to any one of claims 12 to 21.

23. The support block is integrally installed with the plate body. The battery cell according to any one of claims 11 to 18.

24. the plate body includes a second surface facing the first surface along a thickness direction of the plate body, and a recess is formed on the second surface at a position facing the support block.

24. The battery cell of claim 23.

25. The recess extends to an edge of the plate body.

25. The battery cell of claim 24.

26. the support block includes a bottom wall abutting against the first wall and a side wall provided with a first through hole communicating with the recess.

26. The battery cell according to claim 24 or 25.

27. a pressure release mechanism is provided on the first wall, and the first through-hole communicates with the recess and the pressure release mechanism; 27. The battery cell of claim 26.

28. The support blocks include edge support blocks, and the edge support blocks are installed on the edges of the plate body. The battery cell according to any one of claims 24 to 27.

29. The recess is formed on the second surface at a position facing the edge support block, and the recess extends to at least the edge of the plate body in the width direction.

29. The battery cell of claim 28.

30. a second through-hole is formed in the edge support block, the second through-hole penetrating the edge support block in a direction intersecting the thickness direction of the first wall; 30. The battery cell of claim 28 or 29.

31. a pressure release mechanism is provided on the first wall, and the second through-hole is provided to face the pressure release mechanism; 31. The battery cell of claim 30.

32. The support block is installed separately from the plate body, and the support block is fixed to the plate body. The battery cell according to any one of claims 11 to 22.

33. The edge of the support block and the edge of the plate body have a predetermined distance.

33. The battery cell of claim 32.

34. In the width direction of the plate body, the edge of the support block and the edge of the plate body have a predetermined distance.

34. The battery cell of claim 33.

35. The support block is hot-melted to the plate body. The battery cell according to any one of claims 32 to 34.

36. A plurality of the support blocks are installed, and a plurality of welding marks are formed on each of the support blocks and the plate body.

36. The battery cell of claim 35.

37. The hot melt welding marks of the support block are exposed on a surface of the plate body that faces away from the support block.

37. The battery cell of claim 35 or 36.

38. The thickness of the plate body is smaller than the thickness of the support block. The battery cell according to any one of claims 32 to 37.

39. The battery cell further includes a pressure release mechanism, the pressure release mechanism being provided in the first wall, and the fluid passage being used to allow airflow in the internal cavity to flow to the pressure release mechanism. The battery cell according to any one of claims 1 to 38.

40. the exhaust structure includes a plate body and a support block, the support block is installed on one side of the plate body facing the first wall, the fluid passage is formed around the support block, and a projection of the support block on the first wall does not overlap with the pressure release mechanism; 40. The battery cell of claim 39.

41. a reinforcing rib is provided on the plate body at a position facing the pressure release mechanism; 41. The battery cell of claim 40.

42. The reinforcing rib is installed on one side of the plate body facing the first wall; 42. The battery cell of claim 41.

43. The reinforcing ribs extend to the edges of the plate body, and / or the reinforcing ribs extend to the adjacent support blocks.

43. The battery cell of claim 42.

44. In the thickness direction of the first wall, the height of the reinforcing rib is smaller than the height of the support block.

44. The battery cell of claim 42 or 43.

45. The reinforcing ribs are integrally formed with the plate body, or the reinforcing ribs are formed separately from the plate body and connected to each other. The battery cell according to any one of claims 41 to 44.

46. The exhaust structure includes a plate body, the plate body including a first surface disposed along a thickness direction of the plate body, and the fluid passage is a groove disposed on the first surface. The battery cell according to any one of claims 1 to 4 and 39.

47. the exhaust structure includes a plurality of sub-exhaust structures disposed at intervals, and the fluid passage is formed between adjacent sub-exhaust structures; The battery cell according to any one of claims 1 to 4 and 39.

48. The battery cell further includes an insulating film, the insulating film being wrapped around the outer periphery of the electrode assembly and connected to the sub-exhaust structure.

48. The battery cell of claim 47.

49. the outer casing includes a second wall, the second wall includes a second sub-wall, and an electrode terminal is installed on the second sub-wall; The battery cell according to any one of claims 39 to 48.

50. The second sub-wall faces the first wall, or the second sub-wall is connected to the first wall.

50. The battery cell of claim 49.

51. the electrode assembly includes a tab facing the second sub-wall; 51. The battery cell of claim 49 or 50.

52. the second sub-wall is an end cap; The battery cell according to any one of claims 49 to 51.

53. The exhaust structure includes a plate body and a support block, the plate body includes a first surface disposed along a thickness direction of the plate body, the support block is disposed on the first surface, the fluid passage is formed around the support block, and the dimensions of the support block are: The support block has an elongated shape, the length of the plate body is L0, the length of the support block is L1, and the length L1 of the support block is 0.25L0 or more; The thickness H0 of the support block along the thickness direction of the plate body is 0.1 mm or more and 5 mm or less. The support block has an elongated shape, the width of the plate body is A0, and the total width of the support block is 0.2A0 or more and 0.8A0 or less. The battery cell according to any one of claims 1 to 45.

54. A battery cell according to any one of claims 1 to 53. battery.

55. A battery cell according to any one of claims 1 to 53 or a battery according to claim 54. Electrical equipment.

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