Battery device, power utilization device, energy storage device and battery monomer

Abstract

The embodiment of the utility model discloses a battery device, a power utilization device, an energy storage device and a battery cell. The battery device comprises at least two battery monomers, each battery monomer comprises a shell, the shell comprises a shell main body and a first shell wall connected with the shell main body, the first shell wall is located at the end of at least one side of the shell main body in the gravity direction, and the wall thickness of the first shell wall is larger than that of the shell wall of the shell main body; in the gravity direction, at least two battery cells are stacked, and the first shell wall abuts against the adjacent battery cell. According to the embodiment of the invention, the volume utilization rate of the battery device can be improved, and stable support can be formed among the battery monomers stacked along the gravity direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device, a power utilization device, an energy storage device and a battery cell. BACKGROUND

[0002] With the popularization and promotion of the concept of green development, new energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0003] In order to improve the energy of the battery device, the battery device usually includes a plurality of battery cells arranged. The arrangement of the battery cells has an influence on the volume utilization rate of the battery device. In addition, the industry continues to put forward higher requirements for the volume utilization rate and energy density of the battery device. Therefore, further optimizing the arrangement direction of the battery cells and improving the volume utilization rate of the battery device is one of the research topics. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the embodiments of the present application provide a battery device, a power utilization device, an energy storage device and a battery cell capable of improving the volume utilization rate.

[0005] In a first aspect, the embodiments of the present application provide a battery device, which includes at least two battery cells. Each battery cell includes: a shell including a shell main body and a first shell wall connected to the shell main body, the first shell wall being located at at least one side end of the shell main body in the direction of gravity, and the wall thickness of the first shell wall being greater than the wall thickness of the shell wall of the shell main body; and the at least two battery cells are stacked in the direction of gravity, and the first shell wall abuts against an adjacent battery cell.

[0006] In this way, the plurality of layers of battery cells can be arranged along the direction of gravity. In the case where the horizontal space for installing the battery device is limited, the plurality of layers of battery cells can be arranged to fully utilize the space in the direction of gravity, thereby improving the space utilization rate and the energy of the battery device. In addition, since the wall thickness of the first shell wall is greater than the wall thickness of the shell wall of the shell main body, the strength and rigidity of the first shell wall can be improved, thereby enabling stable support to be formed between the battery cells stacked in the direction of gravity, which is conducive to stacking the plurality of battery cells in the direction of gravity, and further improving the volume utilization rate of the battery device.

[0007] In some embodiments, the first shell wall is formed with a protruding portion, and the protruding portion abuts against an adjacent battery cell in the direction of gravity; each battery cell further includes an electrode terminal, which is arranged on the first shell wall and located at a position in the first shell wall where the protruding portion is not formed.

[0008] Since the first shell wall is formed with the protruding portion, the strength and rigidity of the first shell wall can be improved, thereby improving the support stability for the adjacent battery cells and facilitating stacking of the plurality of battery cells in the gravity direction. Moreover, since the electrode terminal is arranged at the first shell wall and at a position of the first shell wall where the protruding portion is not formed, the plurality of battery cells stacked in the gravity direction can occupy as little space as possible in the gravity direction, and the space in the gravity direction can be further fully utilized to arrange the plurality of battery cells in multiple layers, thereby improving the space utilization and the energy of the battery device.

[0009] In some embodiments, the wall thickness of the shell wall of the shell body is in the range of 0.1 mm to 2.0 mm, and the wall thickness of the first shell wall is in the range of 0.8 mm to 3.0 mm.

[0010] Since the shell wall of the shell body is at a suitable thickness, the rigidity and the volume utilization of the shell can be considered; since the first shell wall is at a suitable thickness, the rigidity and the strength of the first shell wall can be considered, and the multilayer stacking in the gravity direction can be achieved to improve the volume utilization.

[0011] In some embodiments, the wall thickness of the first shell wall is in the range of 1.5 mm to 2.5 mm.

[0012] Since the first shell wall is at a suitable thickness, the rigidity and the strength of the first shell wall can be further considered, and the multilayer stacking in the gravity direction can be achieved to improve the volume utilization.

[0013] In some embodiments, the plurality of battery cells form a plurality of battery cell groups, each battery cell group including n battery cells stacked in the gravity direction, n being a natural number greater than or equal to 2 and less than or equal to 10.

[0014] In this way, according to the height of the internal space of the battery device in the gravity direction, a suitable number of battery cells can be stacked to improve the volume utilization.

[0015] In some embodiments, n is 2, and the wall thickness of the first shell wall is in the range of 0.8 mm to 1.0 mm.

[0016] Since 2 battery cells are stacked in the gravity direction, and the wall thickness of the first shell wall is in the range of 0.8 mm to 1.0 mm, a suitable wall thickness of the first shell wall can be selected, the strength and the rigidity of the first shell wall can be satisfied, thereby enabling the battery cells stacked in the gravity direction to form stable support, facilitating saving of materials, and further improving the volume utilization of the battery device.

[0017] In some embodiments, n is 2 or 3, and the wall thickness of the first shell wall is in the range of 1.0 mm to 2.0 mm.

[0018] Since 2 or 3 battery monomers are stacked along the gravity direction, and the wall thickness of the first shell wall is in the range of 1.0mm to 2.0mm, a suitable wall thickness of the first shell wall can be selected, which not only meets the strength and rigidity of the first shell wall, so that stable support can be formed between the battery monomers stacked along the gravity direction, but also helps to save materials, and also improves the volume utilization of the battery device.

[0019] In some embodiments, n is 2 or 3 or 4, and the wall thickness of the first shell wall is in the range of 1.5mm to 2.5mm.

[0020] Since 2 or 3 or 4 battery monomers are stacked along the gravity direction, and the wall thickness of the first shell wall is in the range of 1.5mm to 2.5mm, a suitable wall thickness of the first shell wall can be selected, which not only meets the strength and rigidity of the first shell wall, so that stable support can be formed between the battery monomers stacked along the gravity direction, but also helps to save materials, and also improves the volume utilization of the battery device.

[0021] In some embodiments, n is greater than or equal to 5 and less than or equal to 10, and the wall thickness of the first shell wall is in the range of 1.5mm to 3.0mm.

[0022] Since 5 to 10 battery monomers are stacked along the gravity direction, and the wall thickness of the first shell wall is in the range of 1.5mm to 3.0mm, a suitable wall thickness of the first shell wall can be selected, which not only meets the strength and rigidity of the first shell wall, so that stable support can be formed between the battery monomers stacked along the gravity direction, but also helps to save materials, and also improves the volume utilization of the battery device.

[0023] In some embodiments, the battery monomer further comprises an electrode assembly, the shell has a containing space, the electrode assembly is received in the containing space, the shell body comprises two second shell walls oppositely arranged along a first direction, the first direction is perpendicular to the gravity direction and consistent with the length direction of the battery monomer, and along the first direction, the length of the electrode assembly is greater than 90% and less than 100% of the distance between the opposite wall surfaces of the two second shell walls.

[0024] In this way, not only can the battery monomer and even the battery device have a higher volume utilization, but also a certain supporting force can be provided by the electrode assembly to reduce the degree of bending deformation of the second shell wall along the first direction.

[0025] In some embodiments, the shell body further comprises two third shell walls oppositely arranged along a second direction, the second direction is perpendicular to the gravity direction and the first direction, and along the second direction, the width of the electrode assembly is greater than 90% and less than 100% of the distance between the opposite wall surfaces of the two third shell walls.

[0026] Therefore, not only can the battery monomer and even the battery device have a higher volume utilization rate, but also a certain supporting force can be provided by the electrode assembly to reduce the degree of deformation of the third shell wall in the second direction within a range close to the full length in the first direction.

[0027] In some embodiments, the battery monomer further includes an electrode assembly, the shell has a containing space, the electrode assembly is received in the containing space, the first shell wall is located at one side end of the shell main body in the direction of gravity, the shell main body includes a fourth shell wall arranged opposite to the first shell wall in the direction of gravity, and the height of the electrode assembly relative to the distance between the protruding portion in the first shell wall and the opposite wall surface of the fourth shell wall in the direction of gravity is greater than 80% and less than 100%.

[0028] Therefore, not only can the battery monomer and even the battery device have a higher volume utilization rate, but also a certain supporting force can be provided by the electrode assembly to reduce the degree of deformation of the third shell wall in the second direction within a range close to the full length in the first direction.

[0029] In some embodiments, the length of the first shell wall in the first direction is in a range of 120 mm to 1200 mm, and the first direction is perpendicular to the direction of gravity and consistent with the length direction of the battery monomer.

[0030] Therefore, the embodiments of the application can be applied to battery monomers of various length specifications according to actual conditions, and then battery devices with a matched installation space, a high volume utilization rate, and high energy can be made.

[0031] In some embodiments, the length of the first shell wall in the first direction is in a range of 120 mm to 600 mm.

[0032] Therefore, the embodiments of the application can be applied to battery monomers of various length specifications according to actual conditions, and then battery devices with a matched installation space, a high volume utilization rate, and high energy can be made.

[0033] In some embodiments, the length of the first shell wall in the first direction is in a range of 150 mm to 400 mm.

[0034] Therefore, the embodiments of the application can be applied to battery monomers of various length specifications according to actual conditions, and then battery devices with a matched installation space, a high volume utilization rate, and high energy can be made.

[0035] In some embodiments, the first shell wall is formed with a protrusion, and the protrusion abuts against an adjacent battery cell in the direction of gravity; the length of the protrusion in the first direction is greater than or equal to 50% and less than or equal to 98% of the length of the first shell wall in the first direction.

[0036] In this way, by designing the protrusion to be greater than or equal to 50% of the length of the first shell wall in the first direction, a contact surface large enough to provide support is provided, which is conducive to improving the stability of the stack in the direction of gravity.

[0037] In some embodiments, the width of the first shell wall in the second direction is in the range of 12mm to 90mm, wherein the first direction, the second direction, and the direction of gravity are perpendicular to each other.

[0038] In this way, the embodiments of the present application can be applied to battery cells of various width specifications according to actual conditions, and a battery device with a high volume utilization rate and high energy that matches the installation space of the battery device can be made.

[0039] In some embodiments, the width of the first shell wall in the second direction is in the range of 25mm to 45mm.

[0040] In this way, the embodiments of the present application can be applied to battery cells of various width specifications according to actual conditions, and a battery device with a high volume utilization rate and high energy that matches the installation space of the battery device can be made.

[0041] In some embodiments, the maximum height of the battery cell in the direction of gravity is in the range of 80mm to 250mm.

[0042] In this way, the embodiments of the present application can be applied to battery cells of various height specifications according to actual conditions, and a battery device with a high volume utilization rate and high energy that matches the installation space of the battery device can be made.

[0043] In some embodiments, the maximum height of the battery cell in the direction of gravity is in the range of 100mm to 200mm.

[0044] In this way, the embodiments of the present application can be applied to battery cells of various height specifications according to actual conditions, and a battery device with a high volume utilization rate and high energy that matches the installation space of the battery device can be made.

[0045] In some embodiments, the shell body includes two second shell walls oppositely arranged in the first direction, the first direction being perpendicular to the direction of gravity and consistent with the length direction of the battery cell, and the battery cell further includes a pressure relief component, the pressure relief component being provided on at least one second shell wall.

[0046] Since the pressure relief component is located on the second shell wall instead of the first shell wall where the electrode terminal is located, it is not necessary to leave a channel for discharging the pressure relief gas in the gravity direction, which is conducive to reducing the space occupied by the plurality of battery monomers stacked in the gravity direction, improving the volume utilization rate; moreover, it can reduce the probability of the eruption falling on the electrode terminal when the pressure relief component is relieved, realize the separation of electricity and gas, and reduce the risk of short circuit and even fire caused by thermal runaway of the battery monomer.

[0047] In some embodiments, the shell body further comprises two third shell walls oppositely arranged along the second direction, and the area of the first shell wall and the area of the second shell wall are smaller than the area of the third shell wall.

[0048] Therefore, since the pressure relief component is not formed on the third shell wall with a larger area, the space occupied by the channel for discharging the pressure relief gas can be reduced, further improving the space utilization rate in the battery device.

[0049] In some embodiments, the plurality of battery monomers form a plurality of battery monomer groups, each battery monomer group comprising a plurality of battery monomers stacked in the gravity direction, and the plurality of battery monomer groups comprise a first battery monomer group and a second battery monomer group, the first battery monomer group and the second battery monomer group are arranged along the first direction with an interval therebetween in the first direction, and at least part of the battery monomers in the first battery monomer group and / or at least part of the battery monomers in the second battery monomer group are arranged with the respective pressure relief component facing the interval.

[0050] Since the plurality of battery monomers form a plurality of battery monomer groups, each battery monomer group comprising a plurality of battery monomers stacked in the gravity direction, the battery device can include more battery monomers and provide higher energy; since at least part of the battery monomers in the first battery monomer group and / or at least part of the battery monomers in the second battery monomer group are arranged with the respective pressure relief component facing the interval, the first battery monomer group and the second battery monomer group can share the interval, which is conducive to improving the space utilization rate in the battery device; moreover, the pressure relief component of part of the battery monomers faces the interval, which is also conducive to flexibly designing the arrangement direction of the battery monomers.

[0051] In some embodiments, the first battery monomer group and the second battery monomer group are arranged such that the pressure relief component of each battery monomer in the first battery monomer group and the pressure relief component of each battery monomer in the second battery monomer group both face the interval.

[0052] Therefore, the first battery monomer group and the second battery monomer group share the interval, which is conducive to improving the space utilization rate in the battery device.

[0053] In some embodiments, the pressure relief components of the battery cells in the first battery cell group are staggered along the direction of gravity from the pressure relief components of the battery cells in the second battery cell group, and the projections of the pressure relief components of the battery cells in the first battery cell group do not overlap with the projections of the pressure relief components of the battery cells in the second battery cell group in the same projection plane perpendicular to the first direction.

[0054] In this way, since the pressure relief components of the battery cells are completely staggered along the direction of gravity, the probability of the eruption of the pressure relief components polluting or damaging the pressure relief components of the battery cells on the opposite side when the pressure relief components are relieved is reduced, and the risk of thermal diffusion in the first direction when the battery cells are in thermal runaway is reduced.

[0055] In some embodiments, the plurality of battery cell groups further includes a third battery cell group, the pressure relief components of the battery cells in the third battery cell group are oriented in the same direction as the pressure relief components of the battery cells in the first battery cell group in the first direction, and the second battery cell group is located between the first battery cell group and the third battery cell group along the first direction.

[0056] In this way, more battery cells can be arranged flexibly and efficiently. In addition, the third battery cell group is located on the side of the second battery cell group facing away from the first battery cell group in the first direction, and the pressure relief components are located on the side of the third battery cell group facing away from the second battery cell group, so that the second battery cell group and the third battery cell group can be arranged close to each other or even in contact with each other in the first direction, thereby further improving the space utilization and the energy of the battery device.

[0057] In some embodiments, the plurality of battery cells form a plurality of battery cell groups, each battery cell group includes a plurality of battery cells stacked along the direction of gravity, the plurality of battery cell groups includes a second battery cell group and a third battery cell group, the second battery cell group and the third battery cell group are arranged in the first direction, and the pressure relief components of the battery cells in the third battery cell group are oriented in the direction facing away from the second battery cell group in the first direction, and the pressure relief components of the battery cells in the second battery cell group are oriented in the direction facing away from the third battery cell group in the first direction.

[0058] In this way, the pressure relief components of the two battery cell groups can be further apart, greatly reducing the risk of thermal diffusion in the first direction when the battery cells are in thermal runaway, and the channels for discharging the gas erupted by the pressure relief components can be arranged on both sides of the two battery cell groups, which is conducive to the utilization of the space on both sides.

[0059] In some embodiments, the first shell wall is located at one end of the shell body along the gravity direction, the shell body comprises a fourth shell wall located opposite to the first shell wall along the gravity direction, and the plurality of battery cells form a plurality of battery cell groups, each battery cell group comprises a plurality of battery cells stacked along the gravity direction, and in the same battery cell group, the first shell wall of one of the two adjacent battery cells located below along the gravity direction abuts against the fourth shell wall of the other one located above, or in the same battery cell group, the first shell wall of one of the two adjacent battery cells located above along the gravity direction abuts against the fourth shell wall of the other one located below.

[0060] Therefore, the battery cells can be stacked in a direction with the first shell wall (electrode terminal) upward, or in a direction with the first shell wall (electrode terminal) downward, or in a mixed arrangement of the two directions, so that the arrangement flexibility of the orientation of the battery cells can be improved, and the relief components can be easily staggered by changing the orientation of the battery cells, so that two types of battery cells with different relief component positions do not need to be prepared, which is beneficial to simplify the manufacturing process of the battery cells, improve the production efficiency, and reduce the production cost.

[0061] In some embodiments, the plurality of battery cell groups comprise a plurality of first battery cell groups and a plurality of second battery cell groups, the plurality of first battery cell groups and the plurality of second battery cell groups are arranged along the second direction respectively, and each first battery cell group and each second battery cell group are arranged along the first direction in a manner of being spaced apart along the first direction, the space is communicated along the second direction to form a first channel, and the relief components of each battery cell in the first battery cell group and the relief components of each battery cell in the second battery cell group are all directed toward and communicated with the first channel along the first direction.

[0062] Therefore, the plurality of battery cell groups can be arranged along the first direction and the second direction respectively, so as to form an array of the battery cell groups, thereby being beneficial to improve the energy density and the total energy of the battery; and the first battery cell groups and the second battery cell groups share the first channel, thereby being beneficial to improve the space utilization in the battery device.

[0063] In some embodiments, the first channel comprises a first passage and a second passage, and the first passage and the second passage are separated in the first direction by a partition.

[0064] Therefore, the relief components opposite along the first direction can be reliably separated by the partition, so as to further reduce the risk of the battery cells along the first direction being affected by the thermal runaway of the battery cells, and further reduce the risk of the relief components of the battery cells along the first direction being polluted or damaged by the eruption of the battery cells.

[0065] In some embodiments, the plurality of battery cell groups further comprises a plurality of third battery cell groups, the plurality of third battery cell groups are arranged along a second direction, along the first direction, the second battery cell group is located between the first battery cell group and the third battery cell group; along the first direction, a first channel is formed on a side of the second battery cell group close to the first battery cell group, and a second channel is formed on a side of the third battery cell group away from the second battery cell group, the pressure relief components of the battery cells in the first battery cell group and the pressure relief components of the battery cells in the second battery cell group are directed towards and communicate with the first channel along the first direction, and the pressure relief components of the battery cells in the third battery cell group are directed towards and communicate with the second channel along the first direction.

[0066] In this way, the space utilization rate can be improved when more battery cells are arranged, and a pressure relief channel can be provided for each battery cell to reduce the risk of heat diffusion.

[0067] In some embodiments, the battery cell further comprises an electrode assembly, the shell has a containing space, the electrode assembly is received in the containing space, the electrode terminal comprises a first electrode terminal plate and a second electrode terminal plate, the first electrode terminal plate and the second electrode terminal plate are located on a side of the first shell wall away from the electrode assembly along the gravity direction, and the projection of the first electrode terminal plate and the projection of the second electrode terminal plate at least partially overlap in the same projection plane perpendicular to the second direction.

[0068] In this way, the first electrode terminal plate and the second electrode terminal plate can be arranged compactly along the first direction, reducing the position space occupied in the first direction, so that the protrusion can be designed to be larger, improving the support stability; moreover, designing the protrusion to be larger is conducive to improving the support area, thereby being conducive to improving the support strength and support rigidity, and being conducive to stacking more battery cells along the gravity direction.

[0069] In some embodiments, the first electrode terminal plates and the second electrode terminal plates of the battery cells located in the same layer along the gravity direction are arranged alternately along the second direction, the polarities of the first electrode terminal plates and the second electrode terminal plates are opposite, and the battery device further comprises a busbar, adjacent first electrode terminal plates and second electrode terminal plates in two adjacent battery cells along the second direction are connected by the busbar.

[0070] In this way, the electrical connection between adjacent battery cells along the second direction can be easily achieved.

[0071] In some embodiments, the first shell wall is formed with a protrusion, along the gravity direction, the protrusion abuts against an adjacent battery cell; along the gravity direction, the busbar does not protrude beyond the protrusion towards a side of the protrusion.

[0072] Therefore, the housings of the battery cells stacked along the gravity direction cannot be separated due to the arrangement of the busbar, and the size of each battery cell group along the gravity direction cannot be increased, thus improving the volume utilization.

[0073] In some embodiments, along the gravity direction, the battery device comprises a plurality of battery cell layers, each battery cell layer is stacked along the gravity direction, and each battery cell layer comprises a plurality of battery cells. The battery device further comprises a plurality of support plates, and the support plates are arranged between adjacent battery cell layers along the gravity direction, and the adjacent battery cell layers abut each other through the support plates.

[0074] Therefore, the pressure borne by the lower layer of battery cells can be dispersed, the stacking stability along the gravity direction can be improved, the number of stacked layers along the gravity direction can be increased, and the volume utilization and energy of the battery device can be improved.

[0075] In some embodiments, in the same battery cell layer, part or all of the plurality of battery cells arranged along the first direction abut the same support plate; and / or, in the same battery cell layer, part or all of the plurality of battery cells arranged along the second direction abut the same support plate; and / or, the support plate is at least the surface of the support plate is insulating; and / or, along the gravity direction, at least one side of the battery cell is bonded to the support plate.

[0076] Therefore, the pressure borne by the lower layer of battery cells can be dispersed, and the integrity of the battery cells in the same battery cell layer can be improved, and the stacking stability along the gravity direction can be further improved; and the insulating property of the support plate is conducive to reducing the risk of electric leakage.

[0077] In some embodiments, the battery device further comprises a box, and at least one end of the support plate is supported by the box wall of the box; and / or, the battery device further comprises a box and a beam member arranged in the box, and at least one end of the support plate is supported by the beam member.

[0078] Therefore, the pressure borne by the lower layer of battery cells can be dispersed through the support plate supported by the box wall or the beam member, the stacking stability along the gravity direction can be improved, the number of stacked layers along the gravity direction can be increased, and the volume utilization and energy of the battery device can be improved.

[0079] In some embodiments, the support plate comprises a thermal management component.

[0080] Therefore, the support plate not only improves the stacking stability of the battery cells as described above, but also can manage the heat of the battery cells, and improve the use reliability of the battery device; and no additional thermal management component is needed, thus improving the volume utilization.

[0081] In a second aspect, the embodiments of the present application further provide a power consuming device, which comprises the battery device provided in the first aspect of the embodiments of the present application, and the battery device is used for storing electric energy and powering the power consuming device.

[0082] As the battery device can improve the volume utilization rate and can form stable support between the battery cells stacked along the direction of gravity, the space occupied by the battery device in the power consuming device can be reduced, or the installation space of the battery device in the power consuming device can be fully utilized, the energy of the battery device can be improved, and the endurance of the power consuming device can be improved.

[0083] In a third aspect, the embodiments of the present application further provide an energy storage device, which comprises the battery device provided in the first aspect of the embodiments of the present application, and the battery device is used for storing electric energy and providing electric energy.

[0084] As the battery device can improve the volume utilization rate, the volume of the energy storage device can be reduced, or the storage energy of the energy storage device can be improved.

[0085] In a fourth aspect, the embodiments of the present application further provide a battery cell, which comprises: a shell comprising a shell main body and a first shell wall connected to the shell main body, the first shell wall being located at at least one side end of the shell main body along a third direction, and the wall thickness of the first shell wall being greater than the wall thickness of the shell wall of the shell main body, the third direction being consistent with the direction of gravity in the use state of the battery cell.

[0086] In this way, the strength and rigidity of the first shell wall can be improved, and multiple layers of battery cells can be stacked along the direction of gravity.

[0087] In some embodiments, the battery cell further comprises an electrode assembly and an electrode terminal, the shell has a receiving space, the electrode assembly is received in the receiving space, the first shell wall is formed with a protruding portion, the protruding portion protrudes in a direction away from the electrode assembly along the third direction; and the electrode terminal is arranged on the first shell wall and located at a position of the first shell wall where the protruding portion is not formed.

[0088] As the first shell wall is formed with the protruding portion, the strength and rigidity of the first shell wall can be improved, so that the support stability of the adjacent battery cell along the direction of gravity can be improved, and multiple battery cells can be stacked along the direction of gravity. Moreover, as the electrode terminal is arranged on the first shell wall and located at the position of the first shell wall where the protruding portion is not formed, the miniaturization degree of the battery cell in the group state can be improved.

[0089] In some embodiments, the wall thickness of the shell wall of the shell main body is in the range of 0.1 mm to 2.0 mm, and the wall thickness of the first shell wall is in the range of 0.8 mm to 3.0 mm.

[0090] Since the shell wall of the shell body is at a proper thickness, the rigidity and volume utilization of the shell can be considered; since the first shell wall is at a proper thickness, the rigidity and strength of the first shell wall can be considered, and multi-layer stacking in the direction of gravity can be realized, and the volume utilization is improved. BRIEF DESCRIPTION OF DRAWINGS

[0091] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is merely meant to teach a person of ordinary skill a way to make and use the application. It is not meant to put limitations on the scope of the application. Furthermore, in the entire description of the figures, the same reference numerals are intended to denote the same components. In the figures:

[0092] Figure 1 Structural schematic diagram of a vehicle provided for some embodiments of the application;

[0093] Figure 2 Structural schematic diagram of an energy storage device provided for some embodiments of the application;

[0094] Figure 3 Structural schematic diagram of a battery device provided for some embodiments of the application;

[0095] Figure 4 Exploded perspective schematic diagram of a battery cell provided for some embodiments of the application;

[0096] Figure 5 Perspective schematic diagram of a battery cell provided for some embodiments of the application;

[0097] Figure 6 Perspective schematic diagram of an electrically connected battery cell provided for some embodiments of the application;

[0098] Figure 7 Perspective schematic diagram of a battery cell provided for some other embodiments of the application;

[0099] Figure 8 Perspective schematic diagram of a battery cell provided for some other embodiments of the application;

[0100] Figure 9 Perspective schematic diagram of a battery cell provided for some other embodiments of the application;

[0101] Figure 10 Perspective schematic diagram of a battery cell provided for some embodiments of the application in an arrangement state;

[0102] Figure 11 Perspective schematic diagram of a battery cell provided for some embodiments of the application in a stacked and arranged state;

[0103] Figure 12A perspective view of battery cells in a stacked and arranged state is provided for further embodiments of the present application;

[0104] Figure 13 A perspective view of battery cells in a stacked and arranged state is provided for further embodiments of the present application;

[0105] Figure 14 A perspective view of battery cells in a stacked and arranged state is provided for further embodiments of the present application;

[0106] Figure 15 A perspective view of battery cells in a stacked and arranged state is provided for further embodiments of the present application; Figure 5 A-A cross-sectional view of the battery device 1000;

[0107] Figure 16 A perspective view of battery cells in a stacked and arranged state is provided for further embodiments of the present application;

[0108] Figure 17 A perspective view of battery cells in a stacked and arranged state is provided for further embodiments of the present application.

[0109] BRIEF DESCRIPTION OF DRAWINGS

[0110] 1000 vehicle; 100 battery device; 200 controller; 300 motor; 2000 energy storage device; 400 electrical cabin; 10 battery cell; 20 box body; 20A first box body; 20B second box body; 201 box body wall; 30 battery cell group; 301 first battery cell group; 302 second battery cell group; 303 third battery cell group; 304 fourth battery cell group; 305 fifth battery cell group; 306 sixth battery cell group; 1 housing; 15 housing main body; 11 first housing wall; 111 body portion; 112 protruding portion; 12 second housing wall; 13 third housing wall; 14 fourth housing wall; 2 electrode terminal; 21 first electrode terminal plate; 22 second electrode terminal plate; 3 pressure relief component; 4 interval; 41 first passage; 411 first passage way; 412 second passage way; 42 second passage; 5 tab; 6 electrode assembly; 7 busbar; 8 support plate; 9 partition; Z gravity direction; X first direction; Y second direction. DETAILED DESCRIPTION

[0111] It should be noted that the embodiments and technical features in the present application can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and illustration of the purpose of the present application, and should not be regarded as an improper limitation of the present application.

[0112] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0113] In the description of the application, the technical terms "first", "second", "third", "fourth", "fifth", "sixth" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the application, the meaning of "a plurality of" is more than two, unless otherwise explicitly and specifically limited.

[0114] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0115] In the description of the application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0116] In the description of the embodiments of the application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as limiting the embodiments of the application.

[0117] In the description of the present application, unless explicitly defined and limited otherwise, the technical terms "mount", "connect", "connect", "fix", and other terms should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0118] In the description of the present application, unless explicitly defined and limited otherwise, the technical term "contact" should be understood broadly, which can be direct contact or contact through an intermediate medium layer, and can be contact between two contacting objects without interaction force, or contact between two contacting objects with interaction force.

[0119] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical terms "parallel" and "vertical" allow a certain degree of tolerance and / or error, including approximately parallel and approximately vertical.

[0120] Next, the embodiments of the present application will be described in detail.

[0121] With the popularization and popularization of the concept of green development, new energy batteries are more and more widely used in life and industry, for example, new energy vehicles equipped with batteries have been widely used, in addition, batteries are also more and more widely used in energy storage fields and the like.

[0122] In order to improve the energy of the battery device, the battery device usually includes a plurality of battery monomers arranged, and the arrangement mode of the battery monomers has an influence on the volume utilization rate of the battery device. In addition, the industry continues to put forward higher requirements for the volume utilization rate and energy density of the battery device. Therefore, further optimizing the arrangement direction of the battery monomers and improving the volume utilization rate of the battery device is one of the research topics.

[0123] In order to improve the effective use of limited installation space, a technical concept of stacking multiple layers of battery monomers along the direction of gravity is proposed. However, the multiple layers of battery monomers stacked along the direction of gravity are prone to cause insufficient support force along the direction of gravity, causing deformation or damage of the battery monomers or unstable stacking.

[0124] It is found that, if the shell wall of the battery cell perpendicular to the gravity direction is thickened, the strength and rigidity of the shell wall perpendicular to the gravity direction can be improved, so that stable support can be formed between the battery cells stacked along the gravity direction, which is conducive to stacking multiple battery cells along the gravity direction, and further improves the volume utilization of the battery device. In particular, for the case where the horizontal installation space of the battery device is limited, it is beneficial to fully utilize the space in the gravity direction.

[0125] Based on such technical concept, the application provides a battery device, which comprises at least two battery cells, each battery cell comprising: a shell comprising a shell main body and a first shell wall connected to the shell main body, the first shell wall being located at at least one side end of the shell main body along the gravity direction, and the wall thickness of the first shell wall being greater than the wall thickness of the shell wall of the shell main body; and the at least two battery cells are stacked along the gravity direction, and the first shell wall abuts against the adjacent battery cell.

[0126] In this way, multiple layers of battery cells can be arranged along the gravity direction, and in the case where the horizontal space for installing the battery device is limited, multiple layers of battery cells can be arranged to fully utilize the space in the gravity direction, thereby improving the space utilization and the energy of the battery device. In addition, since the wall thickness of the first shell wall is greater than the wall thickness of the shell wall of the shell main body, the strength and rigidity of the first shell wall can be improved, so that stable support can be formed between the battery cells stacked along the gravity direction, which is conducive to stacking multiple battery cells along the gravity direction, and further improves the volume utilization of the battery device.

[0127] The battery device provided by the embodiments of the application can be used in, but is not limited to, an electric device such as an energy storage device, a vehicle, a ship or an aircraft.

[0128] The embodiments of the application also provide an electric device comprising the above battery device, which can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric aircraft toys, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0129] The embodiments of the application also provide an energy storage device comprising the above battery device, which includes an energy storage container, an energy storage cabinet, etc.

[0130] In addition, the embodiments of the application also provide a battery cell for the above battery device.

[0131] For the convenience of description, the electric device of an embodiment of the application is taken as a vehicle 1000 for example. The following will be described with reference to the accompanying drawings.

[0132] Figure 1 A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. As shown, the vehicle 1000 is internally provided with a battery apparatus 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery apparatus 100 can be used for power supply of the vehicle 1000, for example, the battery apparatus 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery apparatus 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving. Figure 1

[0133] In some embodiments of the present application, the battery apparatus 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0134] Figure 3 A structural schematic diagram of a battery apparatus is provided for some embodiments of the present application.

[0135] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 10 (see Figure 4 ), which are connected in series, in parallel, or in a mixed connection mode by busbars. The plurality of battery cells are electrically connected to form a power supply circuit, and connecting the motor 300 or other electrical appliances of the electric vehicle to the power supply circuit can form an electrical circuit.

[0136] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0137] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0138] In some embodiments, the battery apparatus can be a battery pack, which includes a box 20 and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0139] ​As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the case by fixing the battery module in the case.

[0140] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging the battery cell.

[0141] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0142] Next, the embodiments of the present application will be described in detail. Figures 3 to 17 The embodiments of the present application will be described in detail.

[0143] Figure 3 A structural schematic diagram of a battery device provided for some embodiments of the present application is shown in FIG. 1. Figure 4 An exploded perspective schematic diagram of a battery cell provided for some embodiments of the present application is shown in FIG. 2. Figure 5 A perspective schematic diagram of a battery cell provided for some embodiments of the present application is shown in FIG. 3. Figure 6 A perspective schematic diagram of an electrically connected battery cell provided for some embodiments of the present application is shown in FIG. 4. Figure 7 A perspective schematic diagram of a battery cell provided for some other embodiments of the present application is shown in FIG. 5. Figure 8 A perspective schematic diagram of a battery cell provided for some other embodiments of the present application is shown in FIG. 6. Figure 9 A perspective schematic diagram of a battery cell provided for some other embodiments of the present application is shown in FIG. 7. Figure 10 A perspective schematic diagram of a battery cell in an arrangement state provided for some embodiments of the present application is shown in FIG. 8. Figure 11 A perspective schematic diagram of a battery cell in a stacked and arranged state provided for some embodiments of the present application is shown in FIG. 9. Figure 12 A perspective schematic diagram of a battery cell in a stacked and arranged state provided for some other embodiments of the present application is shown in FIG. 10. Figure 13 A perspective schematic diagram of a battery cell in a stacked and arranged state provided for some other embodiments of the present application is shown in FIG. 11. Figure 14 A schematic diagram of a battery cell in a stacked and arranged state provided for some embodiments of the present application is shown in FIG. 12. Figure 15 A schematic diagram of a battery device provided for some embodiments of the present application is shown in FIG. 13. Figure 5 A schematic diagram of an A-A cross-sectional view of the battery device is shown in FIG. 14. Figure 16 A perspective schematic diagram of a battery cell in a stacked and arranged state provided for some other embodiments of the present application is shown in FIG. 15. Figure 17 A perspective schematic diagram of a battery cell in a stacked and arranged state provided for some other embodiments of the present application is shown in FIG. 16.

[0144] In the description of the embodiments of the present application, the direction in which the arrow X is located is referred to as the "first direction", the direction in which the arrow Y is located is referred to as the "second direction", and the direction in which the arrow Z is located is referred to as the "gravity direction" or the "third direction". It should be noted that the gravity direction herein is in the case that the battery device is generally horizontally placed.

[0145] The first aspect of the present application provides a battery device 100, as shown in Figure 3 The battery device 100 includes at least two battery monomers 10, as shown in Figures 4 to 9 , Figure 15 As shown in Figure 3 , Figures 11 to 14 , Figure 16 , Figure 17 At least two battery monomers 10 are stacked along the gravity direction Z, and the first shell wall 11 abuts against the adjacent battery monomer 10.

[0146] In some embodiments, as shown in Figures 4 to 9 The battery monomer includes a shell 1. The shell 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell 1), or an aluminum-plastic film, etc. The battery monomer generally also includes an electrode assembly 6. In some embodiments, the shell 1 can be a sealed structure or a non-sealed structure. As an example, when the shell 1 is a non-sealed structure, the shell 1 serves to protect the electrode assembly 6, and a sealing bag can be further included between the shell 1 and the electrode assembly 6, which is used to encapsulate the electrode assembly 6 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell 1 is a sealed structure, it is used to encapsulate the electrode assembly 6 and the electrolyte, etc.

[0147] In some embodiments, as shown in Figure 4 The battery monomer 10 includes an electrode assembly 6. The electrode assembly 6 includes a positive electrode sheet, a negative electrode sheet, and a separator. During the charging and discharging process of the battery monomer, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode sheet and the negative electrode sheet, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, allow the active ions to pass through. Figure 4 As the electrode assembly 6, two laminated jelly rolls formed by laminating and winding the positive electrode sheet, the negative electrode sheet, and the separator are shown in the embodiment shown in Figure 4 However, the electrode assembly 6 is not limited to the winding structure shown in

[0148] As an example, the battery cell 10 can be a prismatic battery cell or other shaped battery cell, including a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc. Figures 4 to 17 In the illustrated embodiment, for ease of illustration, a battery cell with a cuboid-shaped housing is taken as an example for illustration.

[0149] In some embodiments, as shown in the figure, the housing 1 includes a plurality of housing walls, a portion of which are connected to each other to form a housing main body 15 and enclose a space with an opening, which can be closed by another housing wall (e.g., the first housing wall 11) to form an accommodation space for accommodating the electrode assembly 6 and electrolyte and other substances. The housing 1 can be provided with one or more openings. The housing wall (e.g., the first housing wall 11) closing the opening can also be configured as a top cover. As an example, the housing main body 15 can be formed by bending and welding a sheet material; or can be formed by stamping; or can be formed by casting. Figure 4

[0150] In some embodiments, as shown in the figure, at least one end of at least one side of the housing main body 15 along the gravity direction Z is provided with a housing wall, which is named as the "first housing wall 11" for ease of description, and the first housing wall 11 can be a top wall and / or a bottom wall of the housing walls in the housing 1. Figure 4

[0151] In the embodiments of the present application, the first housing wall 11 mainly refers to the portion closing the accommodation space formed by the housing main body 15. In some specific embodiments, the top cover can further include a mounting flange (not shown in the figure) connected to the first housing wall 11, which can extend into the accommodation space. In the embodiments of the present application, the first housing wall 11 does not include a mounting flange. The top cover can be connected to other housing walls by means of adhesion and / or welding, etc.

[0152] In some embodiments, as shown in the figure, among the plurality of battery cells 10 stacked along the gravity direction Z, the first housing wall 11 abuts against the adjacent battery cell 10. Alternatively, the first housing wall 11 can abut against the first housing wall 11 of the adjacent battery cell 10 (not shown in the figure), or can abut against the housing wall (e.g., the fourth housing wall 14) of the adjacent battery cell 10 opposite to the first housing wall 11 along the gravity direction. Figures 11 to 16 In order to improve the rigidity of the first housing wall of the battery cell stacked along the gravity direction, improve the support stability, and increase the wall thickness of the first housing wall 11 as a support surface.

[0153] In some embodiments, as shown in the figure,

[0154] , Figure 4 , Figure 15 ​​As shown, along the gravity direction Z, the wall thickness H3 of the first housing wall 11 is greater than the wall thickness H4 of the housing wall of the housing body 15. It is to be noted that, in the present application, the wall thickness of the housing wall of the housing body 15 refers to the thickness of the housing wall of the housing body 15 which is not locally thickened or locally thinned. Figure 4 , Figure 15 As shown, the wall thickness H3 of the first housing wall 11 refers to the distance between the upper edge and the lower edge of the first housing wall 11 (the part of the first housing wall 11 which is not locally thickened or locally thinned) along the gravity direction Z. In addition, the first housing wall 11 and the housing body 15 can have slight changes in thickness due to the processing technology during the forming process (for example, slight changes in thickness of the bending part due to stamping or bending), which can be ignored in the present application unless otherwise specified.

[0155] For example, when the first housing wall 11 is a cuboid, the wall thickness H3 of the first housing wall refers to the distance between the two surfaces of the first housing wall 11 which are perpendicular to the gravity direction Z. The first housing wall includes a body part 111 and a protruding part 112 which protrudes away from the electrode assembly 6 (the upper side in the figure) along the gravity direction Z with respect to the body part 111, and the protruding part 112 and the body part 111 are achieved by locally bending the first housing wall, wherein the thickness of the body part 111 along the gravity direction and the thickness of the protruding part 112 along the gravity direction are both substantially greater than the wall thickness of the housing wall of the housing body 15. Of course, the first housing wall 11 can also be formed in other shapes.

[0156] In another embodiment, the protruding part 112 is formed in the first housing wall 11 by locally thickening (for example, additional thickening blocks) as shown in Figure 9 , in which case the thickness of the protruding part 112 is not included in the thickness of the first housing wall 11.

[0157] In addition, it is to be noted that the wall thickness of the housing wall of the housing body 15 refers to the thickness of the part of the housing wall of the housing body 15 which is not locally thickened or locally thinned. In addition, for example, the housing body 15 includes a second housing wall 12 which is arranged opposite and perpendicular to the first direction X, a third housing wall 13 which is arranged opposite and perpendicular to the second direction Y, and a fourth housing wall 14 which is arranged opposite and perpendicular to the gravity direction Z and to the first housing wall 11, and the wall thickness of the housing body 15 refers to the wall thickness of the second housing wall 12, the third housing wall 13 and the fourth housing wall 14. For the measurement of the thickness, the commonly used method, such as the vernier caliper, can be used.

[0158] Therefore, the plurality of battery cells can be arranged along the gravity direction Z, and in the case that the horizontal space for installing the battery device is limited, the space along the gravity direction Z can be fully utilized to arrange the plurality of battery cells, thereby improving the space utilization and the energy of the battery device. In addition, since the wall thickness H3 of the first shell wall 11 is greater than the wall thickness H4 of the shell wall of the shell body 15, the strength and rigidity of the first shell wall 11 can be improved, thereby enabling the battery cells 10 stacked along the gravity direction Z to form stable support between each other, which is conducive to stacking a plurality of battery cells along the gravity direction, thereby further improving the volume utilization of the battery device.

[0159] In some embodiments, the first shell wall 11 is formed with a protruding portion 112, and along the gravity direction Z, the protruding portion 112 abuts against the adjacent battery cell 10; each battery cell 10 further comprises an electrode terminal 2, which is arranged on the first shell wall 11 and located at a position of the first shell wall 11 where the protruding portion 112 is not formed.

[0160] In some embodiments, as shown in Figures 4 to 9 , the first shell wall 11 comprises a body portion 111 and a protruding portion 112 protruding away from the electrode assembly 6 (the upper side in the figure) along the gravity direction Z relative to the body portion 111. The shape of the body portion 111 and the protruding portion 112 is not limited in the present application, for example, the protruding portion 112 can be a cuboid or a cylinder, etc.

[0161] In some embodiments, for ease of understanding, as shown in Figure 4 , Figure 5 , Figure 7 , Figure 8 and Figure 9 , the body portion 111 is within the dashed box O1, and the protruding portion 112 is within the dashed box O2. It should be noted that the distinction by the dashed box is for ease of understanding and illustration, and for the first shell wall 11, the body portion 111 and the protruding portion 112 can be integrally connected.

[0162] The protruding portion 112 can be formed by bending the first shell wall 11 to have a concave-convex shape as shown in Figures 4 to 8 , or can be realized by thickening a local portion of the first shell wall 11 as shown in Figure 9 , wherein the wall thickness H3 of the first shell wall 11 does not include the thickness of the local thickening region.

[0163] In some embodiments, as shown in Figures 4 to 8As shown, the first housing wall 11 has a protrusion 112, which is formed by forming the first housing wall 11 into a concave-convex shape. Other housing walls connected to the first housing wall 11 have extensions extending in the direction of gravity, and the extensions are connected to the protrusion 112. Thus, the first housing wall 11 and other housing walls can form an accommodating space.

[0164] For example, in the first housing wall 11, a portion of the first housing wall 11 protrudes relative to the body portion 111 in a direction away from the electrode assembly 6 along the gravity direction Z to form a protrusion 112; alternatively, in the first housing wall 11, a portion of the first housing wall 11 is recessed in a direction close to the electrode assembly 6 along the gravity direction Z to form the body portion 111, and the protrusion relative to the body portion 111 along the gravity direction Z is the protrusion 112. The surface of the protrusion 112 on the side away from the electrode assembly 6 along the gravity direction Z serves as a support surface when supporting adjacent battery cells 10. In the first housing wall 11, the transition portion between the body portion 111 and the support surface (the transition portion can be considered as part of the protrusion 112) can extend along the gravity direction Z, or it can extend at a certain angle relative to the gravity direction Z. Of course, the first housing wall 11 may have other structures besides the body portion 111 and the protrusion 112.

[0165] Optionally, such as Figures 5 to 9 As shown, there can be one, two, or even three or more protrusions 112. Along the direction perpendicular to the direction of gravity Z, the protrusions 112 can be located near the end of the first housing wall 11 or in the general middle region of the first housing wall 11.

[0166] For example, when there is only one protrusion 112, such as Figure 7 As shown, along the first direction X, the protrusion 112 is located on one side of the body portion 111, and the protrusion 112 can extend along the first direction to one end of the first housing wall 11 along the first direction (e.g. Figure 7 The body portion 111 can extend along the first direction to the other end of the first housing wall 11 along the first direction (e.g., the right end shown), and the body portion 111 can extend along the first direction to the other end of the first housing wall 11 along the first direction (e.g., the right end shown). Figure 7 (as shown on the left end); or as shown Figure 8 As shown, along the first direction X, the main body 111 is located on both sides of the protrusion 112.

[0167] For example, when there are two protrusions 112, such as Figures 4 to 6 , Figure 9 As shown, along the first direction X, the main body 111 is located approximately in the middle of the first housing wall 11, and the protrusions 112 are located on both sides of the main body 111. The two protrusions 112 can extend along the first direction X to both ends of the first housing wall 11 (e.g., ...).Figure 5 As shown in FIG. 1, the protruding portion 112 is arranged on the first shell wall 11, and the body portion 111 is arranged on the second shell wall 12, the third shell wall 13 and the fourth shell wall 14. In some embodiments, the protruding portion 112 and the body portion 111 can be arranged on the same shell wall. For example, as shown in FIG. 2, the protruding portion 112 and the body portion 111 are arranged on the first shell wall 11. In some embodiments, the protruding portion 112 and the body portion 111 can be arranged on different shell walls. For example, as shown in FIG. 3, the protruding portion 112 is arranged on the first shell wall 11, and the body portion 111 is arranged on the second shell wall 12. In some embodiments, the protruding portion 112 and the body portion 111 can be arranged on all the shell walls. For example, as shown in FIG. 4, the protruding portion 112 and the body portion 111 are arranged on the first shell wall 11, the second shell wall 12, the third shell wall 13 and the fourth shell wall 14. Figure 9 As shown in FIG. 1, the protruding portion 112 is arranged on the first shell wall 11, and the body portion 111 is arranged on the second shell wall 12, the third shell wall 13 and the fourth shell wall 14. In some embodiments, the protruding portion 112 and the body portion 111 can be arranged on the same shell wall. For example, as shown in FIG. 2, the protruding portion 112 and the body portion 111 are arranged on the first shell wall 11. In some embodiments, the protruding portion 112 and the body portion 111 can be arranged on different shell walls. For example, as shown in FIG. 3, the protruding portion 112 is arranged on the first shell wall 11, and the body portion 111 is arranged on the second shell wall 12. In some embodiments, the protruding portion 112 and the body portion 111 can be arranged on all the shell walls. For example, as shown in FIG. 4, the protruding portion 112 and the body portion 111 are arranged on the first shell wall 11, the second shell wall 12, the third shell wall 13 and the fourth shell wall 14.

[0168] The above embodiments are only examples of the number and positional relationship of the protruding portion 112 and the body portion 111. The protruding portion 112 and the body portion 111 can have more numbers, and the protruding portion 112 and the body portion 111 can have other positional relationships, for example, the protruding portion 112 and the body portion 111 can be arranged along the second direction Y. Details are not described herein.

[0169] In some embodiments, the electrode assembly 6 includes a tab 5, and the electrode terminal 2 is electrically connected with the tab 5 to lead current in or out of the electrode assembly 6.

[0170] In some embodiments, the electrode terminal 2 is at least partially exposed to the body portion 111, and the electrode terminal 2 does not protrude beyond the protruding portion 112 along the gravity direction Z. “Exposed” includes being exposed to the body portion 111 but not protruding beyond the body portion 111 along the gravity direction Z, and also includes protruding beyond the body portion 111 along the gravity direction Z.

[0171] In some embodiments, as shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, the protruding portion 112 is arranged on the first shell wall 11, and the body portion 111 is arranged on the second shell wall 12, the third shell wall 13 and the fourth shell wall 14. Figures 11 to 14 , Figure 16 or Figure 17 In some embodiments, as shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, the protruding portion 112 is arranged on the first shell wall 11, and the body portion 111 is arranged on the second shell wall 12, the third shell wall 13 and the fourth shell wall 14.

[0172] Since the first shell wall 11 is formed with the protruding portion 112, the strength and rigidity of the first shell wall 11 can be improved, thereby improving the support stability of the adjacent battery monomer 10, which is conducive to stacking multiple battery monomers along the gravity direction Z. Moreover, since the electrode terminal 2 is arranged on the first shell wall 11 and located at a position of the first shell wall 11 where the protruding portion 112 is not formed, the multiple battery monomers stacked along the gravity direction Z can occupy as little space as possible along the gravity direction Z, and multiple layers of battery monomers can be arranged along the gravity direction to further fully utilize the space along the gravity direction, thereby improving the space utilization and the energy of the battery device.

[0173] In some embodiments, as shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, the protruding portion 112 is arranged on the first shell wall 11, and the body portion 111 is arranged on the second shell wall 12, the third shell wall 13 and the fourth shell wall 14. Figure 7 andFigure 8 As shown in FIG. 1, the first shell wall 11 includes a body portion 111 and a protruding portion 112, the body portion 111 and the protruding portion 112 are connected along the first direction X, the first shell wall 11 includes one protruding portion 112, the electrode terminal 2 is located on one side or both sides of the protruding portion 112 along the first direction X, and the first direction X is perpendicular to the direction of gravity Z.

[0174] In some embodiments, as shown in FIG. 1, the electrode assembly 6 includes a first tab and a second tab having opposite polarities, and the first tab and the second tab can conduct current out of the electrode assembly 6. One of the first tab and the second tab can be a positive tab, and the other can be a negative tab. Figure 4 In some embodiments, as shown in FIG. 1, the electrode terminal 2 includes a first electrode terminal and a second electrode terminal, the first electrode terminal is electrically connected to the first tab, and the second electrode terminal is electrically connected to the second tab to conduct current into or out of the electrode assembly 6.

[0175] Figure 4 In some embodiments, as shown in FIG. 1, the electrode terminal 2 includes a first electrode terminal and a second electrode terminal, the first electrode terminal is electrically connected to the first tab, and the second electrode terminal is electrically connected to the second tab to conduct current into or out of the electrode assembly 6.

[0176] In a specific embodiment, as shown in FIG. 1, along the first direction X, the protruding portion 112 is located at a substantially middle position of the first shell wall 11, and the first electrode terminal and the second electrode terminal are located on one side (e.g., the left side or the right side as shown in FIG. 1) of the protruding portion 112, or the first electrode terminal and the second electrode terminal are respectively located on both sides (e.g., the left side and the right side as shown in FIG. 1) of the protruding portion 112. Figure 8 Figure 8 In a specific embodiment, as shown in FIG. 1, along the first direction X, the protruding portion 112 is located at a substantially middle position of the first shell wall 11, and the first electrode terminal and the second electrode terminal are located on one side (e.g., the left side or the right side as shown in FIG. 1) of the protruding portion 112, or the first electrode terminal and the second electrode terminal are respectively located on both sides (e.g., the left side and the right side as shown in FIG. 1) of the protruding portion 112. Figure 8 In a specific embodiment, as shown in FIG. 1, along the first direction X, the protruding portion 112 is located at a substantially middle position of the first shell wall 11, and the first electrode terminal and the second electrode terminal are located on one side (e.g., the left side or the right side as shown in FIG. 1) of the protruding portion 112, or the first electrode terminal and the second electrode terminal are respectively located on both sides (e.g., the left side and the right side as shown in FIG. 1) of the protruding portion 112.

[0177] Figure 7 In a specific embodiment, as shown in FIG. 1, along the first direction X, the protruding portion 112 is located at a substantially middle position of the first shell wall 11, and the first electrode terminal and the second electrode terminal are located on one side (e.g., the left side or the right side as shown in FIG. 1) of the protruding portion 112, or the first electrode terminal and the second electrode terminal are respectively located on both sides (e.g., the left side and the right side as shown in FIG. 1) of the protruding portion 112. Figure 7 Figure 7 In a specific embodiment, as shown in FIG. 1, along the first direction X, the protruding portion 112 is located at a substantially middle position of the first shell wall 11, and the first electrode terminal and the second electrode terminal are located on one side (e.g., the left side or the right side as shown in FIG. 1) of the protruding portion 112, or the first electrode terminal and the second electrode terminal are respectively located on both sides (e.g., the left side and the right side as shown in FIG. 1) of the protruding portion 112.

[0178] In this way, the entire protruding portion 112 can be used to support the battery cells of the adjacent layer, which is conducive to improving the support stability, and the position of the electrode terminal can be flexibly designed.

[0179] In some embodiments, as shown in FIG. 1, the first shell wall 11 includes a body portion 111 and a protruding portion 112, the body portion 111 and the protruding portion 112 are connected along the first direction X, the first shell wall 11 includes at least two protruding portions 112, and the electrode terminal is located between the two protruding portions 112 adjacent along the first direction X, and the first direction X is perpendicular to the direction of gravity Z. Figure 5 Figure 9 In a specific embodiment, as shown in FIG. 1, the first shell wall 11 includes a body portion 111 and a protruding portion 112, the body portion 111 and the protruding portion 112 are connected along the first direction X, the first shell wall 11 includes at least two protruding portions 112, and the electrode terminal is located between the two protruding portions 112 adjacent along the first direction X, and the first direction X is perpendicular to the direction of gravity Z.

[0180] In a specific embodiment, as shown in FIG. 1, the first shell wall 11 includes a body portion 111 and a protruding portion 112, the body portion 111 and the protruding portion 112 are connected along the first direction X, the first shell wall 11 includes at least two protruding portions 112, and the electrode terminal is located between the two protruding portions 112 adjacent along the first direction X, and the first direction X is perpendicular to the direction of gravity Z. Figure 5 Figure 9 ​​​​​​As shown, along the first direction X, the two protrusions 112 are arranged in line along the first direction X, and the electrode terminal is located between the two protrusions 112. Among them, along the first direction X, the two protrusions 112 can respectively extend to the two ends of the first shell wall 11 along the first direction (for example Figure 5 As shown, the left end and the right end), or along the first direction X, the two protrusions can not extend to the two ends of the first shell wall 11 along the first direction (for example Figure 9 As shown, the left end and the right end).

[0181] In some embodiments, there can be three, four or more protrusions 112, for example, there can be three protrusions, and there is a body portion between each adjacent protrusion, and the electrode terminal is located in the body portion, and in the stacked state along the gravity direction Z, the three protrusions are all abutted to the adjacent battery monomers.

[0182] The position of the two or more protrusions is not particularly limited, but it is beneficial to improve the support stability to be arranged generally symmetrically.

[0183] Therefore, by abutting the at least two protrusions 112 to the adjacent battery monomers and locating the electrode terminal between the adjacent protrusions 112, the support stability in the gravity direction Z can be improved. Moreover, the position of the electrode terminal can be flexibly designed.

[0184] In some embodiments, as Figure 4 As shown, the wall thickness of the shell wall of the shell body 15 is in the range of 0.1mm to 2.0mm, and the wall thickness H3 of the first shell wall 11 is in the range of 0.8mm to 3.0mm.

[0185] In some embodiments, the wall thickness of the second shell wall 12 along the first direction X, the wall thickness of the third shell wall 13 along the second direction Y, and the wall thickness of the fourth shell wall 14 along the gravity direction Z are in the range of 0.1mm to 2.0mm. Alternatively, the wall thickness of the shell wall of the shell body 15 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, etc., and of course other values within the above range are also possible.

[0186] In some embodiments, the first shell wall 11 is a flat plate (not shown), and the wall thickness H3 of the first shell wall 11 is in the range of 0.8mm to 3.0mm. In other embodiments, as Figures 3 to 9As shown, the first shell wall 11 has a connected protruding portion 112 and a body portion 111, the wall thickness H3 of the protruding portion 112 and the body portion 111 is substantially the same and is in the range of 0.8mm to 3.0mm.

[0187] Optionally, the wall thickness H3 of the first shell wall 11 along the gravity direction Z can be 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, etc., and of course can also be other values within the above range.

[0188] For example: the wall thickness of the shell wall of the shell body 15 can be 0.2mm, the wall thickness H3 of the first shell wall 11 along the gravity direction Z can be 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, etc., and of course can also be other values within the above range. The wall thickness of the shell wall of the shell body 15 can be 1.9mm, the wall thickness H3 of the first shell wall 11 along the gravity direction Z can be 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, etc.

[0189] Since the shell wall of the shell body 15 is at a suitable thickness, the rigidity and volume utilization of the shell can be considered; since the first shell wall 11 is at a suitable thickness, the rigidity and strength of the first shell wall 11 can be considered, and multi-layer stacking along the gravity direction can be achieved, improving the volume utilization.

[0190] In some embodiments, the wall thickness of the first shell wall is in the range of 1.5mm to 2.5mm.

[0191] Optionally, the wall thickness H3 of the first shell wall 11 along the gravity direction Z can be 1.5mm, 1.55mm, 1.65mm, 1.75mm, 1.85mm, 1.95mm, 2.05mm, 2.15mm, 2.25mm, 2.35mm, 2.45mm, 2.5mm, etc., and of course can also be other values within the above range.

[0192] Since the first shell wall is at a proper thickness, the rigidity and strength of the first shell wall can be further considered, and multi-layer stacking in the gravity direction can be achieved, improving the volume utilization.

[0193] In some embodiments, the wall thickness H3 of the first shell wall 11 in the gravity direction Z can be adaptively adjusted according to the number of battery cells in the gravity direction Z of the battery device and the weight of the battery cells. When the number of battery cells in the gravity direction Z of the battery device is greater, the wall thickness H3 of the first shell wall 11 of the battery cells in the column is thicker, or when the number of battery cells in the gravity direction Z is the same, the weight of the individual battery cells is heavier, the wall thickness H3 of the first shell wall 11 of the battery cells below in the gravity direction Z is thicker, or the wall thickness H3 of the first shell wall 11 of the battery cells below in the gravity direction Z is thicker.

[0194] In some embodiments, as shown in Figures 11 to 14 , Figure 16 or Figure 17 , the plurality of battery cells 10 form a plurality of battery cell groups 30, each battery cell group 30 including n battery cells 10 stacked in the gravity direction, n being a natural number greater than or equal to 2 and less than or equal to 10.

[0195] The n battery cells 10 stacked in the gravity direction form a battery cell group 30, and the plurality of battery cell groups 30 are arranged in the first direction X and / or the second direction Y to form the battery device 100.

[0196] The number of battery cells 10 stacked in the gravity direction Z in each battery cell group 30 can be the same or different.

[0197] Optionally, each battery cell group 30 can stack 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 battery cells 10 in the gravity direction.

[0198] In this way, according to the height of the internal space of the battery device in the gravity direction, a proper number of battery cells can be stacked to improve the volume utilization.

[0199] The wall thickness H3 of the first shell wall 11 is described in detail below in the case where the number of battery cells 10 stacked in the gravity direction Z is different, in order to consider the rigidity requirement of the first shell wall 11 and improve the volume utilization of the battery device.

[0200] In some embodiments, n is 2, and the wall thickness of the first shell wall is in the range of 0.8mm to 1.0mm.

[0201] Each battery cell group 30 can stack 2 battery cells 10 along the gravity direction Z, and the first shell wall 11 of the battery cell 10 in the battery cell group 30 has a wall thickness H3 in the range of 0.8mm to 1.0mm. Alternatively, the wall thickness H3 of the first shell wall 11 can be 0.8mm, 0.9mm, or 1.0mm, or other values in the above range.

[0202] Since 2 battery cells are stacked along the gravity direction, and the wall thickness of the first shell wall 11 is in the range of 0.8mm to 1.0mm, a suitable wall thickness of the first shell wall 11 can be selected, which can satisfy the strength and rigidity of the first shell wall 11, so that stable support can be formed between the battery cells 10 stacked along the gravity direction Z, and the material can be saved, and the volume utilization of the battery device can be improved.

[0203] In some embodiments, n is 2 or 3, and the wall thickness of the first shell wall is in the range of 1.0mm to 2.0mm.

[0204] Each battery cell group 30 can stack 2 or 3 battery cells 10 along the gravity direction Z, and the first shell wall 11 of the battery cell 10 in the battery cell group 30 has a wall thickness H3 in the range of 1.0mm to 2.0mm. Alternatively, the wall thickness H3 of the first shell wall 11 can be 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, or other values in the above range.

[0205] Since 2 or 3 battery cells are stacked along the gravity direction, and the wall thickness of the first shell wall is in the range of 1.0mm to 2.0mm, a suitable wall thickness of the first shell wall can be selected, which can satisfy the strength and rigidity of the first shell wall, so that stable support can be formed between the battery cells stacked along the gravity direction, the material can be saved, and the volume utilization of the battery device can be improved.

[0206] In some embodiments, n is 2 or 3 or 4, and the wall thickness H3 of the first shell wall is in the range of 1.5mm to 2.5mm. For example, each battery cell group 30 stacks 4 battery cells 10 along the gravity direction, the wall thickness of the first shell wall 11 is 2.5mm, and the wall thickness of the shell body is 0.2mm.

[0207] Since 2, 3, or 4 battery cells are stacked along the direction of gravity, and the wall thickness H3 of the first housing wall is in the range of 1.5mm to 2.5mm, a suitable wall thickness of the first housing wall can be selected. This satisfies the strength and rigidity of the first housing wall, thereby enabling stable support between the battery cells stacked along the direction of gravity. It also helps to save materials and improve the volume utilization rate of the battery device.

[0208] In some embodiments, n is greater than or equal to 5 and less than or equal to 10, and the wall thickness H3 of the first housing wall is in the range of 1.5 mm to 3.0 mm.

[0209] Each battery cell group 30 can stack 5, 6, 7, 8, 9, or 10 battery cells 10 along the direction of gravity. The wall thickness H3 of the first housing wall 11 of the battery cell 10 in the battery cell group 30 is in the range of 1.5 mm to 3.0 mm. Optionally, the wall thickness H3 of the first housing wall 11 can be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, etc., or other values ​​within the above range.

[0210] Since 5 to 10 battery cells are stacked along the direction of gravity, and the thickness of the first housing wall is in the range of 1.5 mm to 3.0 mm, a suitable thickness of the first housing wall can be selected. This satisfies the strength and rigidity of the first housing wall, thereby enabling stable support between the battery cells stacked along the direction of gravity. It also helps to save materials and improves the volume utilization of the battery device.

[0211] In some embodiments, such as Figure 4 As shown, the battery cell 10 also includes an electrode assembly 6. The housing has a receiving space, and the electrode assembly 6 is housed in the receiving space. The housing body 15 includes two second housing walls 12 arranged opposite to each other along a first direction X. The first direction X is perpendicular to the gravity direction Z and is consistent with the length direction of the battery cell 10. Along the first direction X, the ratio of the length L6 of the electrode assembly 6 to the distance L7 between the opposite walls of the two second housing walls 12 is greater than 90% and less than 100%.

[0212] The length direction of a battery cell 10 refers to the direction in which the longest edge of the battery cell extends perpendicular to the direction of gravity. In some embodiments, it is the direction in which the longest edge among all the edges of the battery cell 10 extends. For example, when the battery cell 10 is a prismatic battery cell, the extension direction of the longest edge among all the edges in the prismatic battery cell is the length direction.

[0213] The ratio of the length L6 of the electrode assembly 6 to the distance L7 between the opposite wall surfaces of the two second housing walls 12 in the first direction X can be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%, or other values within the above range.

[0214] Thus, not only can the battery cell and even the battery device have a higher volume utilization rate, but also a certain supporting force can be provided by the electrode assembly 6 to reduce the degree of bending deformation of the second housing wall 12 in the first direction X.

[0215] In some embodiments, the shell body 15 further includes two third housing walls 13 oppositely arranged in a second direction Y, which is perpendicular to the gravity direction Z and the first direction X. In the second direction Y, the ratio of the width of the electrode assembly 6 to the distance between the opposite wall surfaces of the two third housing walls 13 is greater than 90% and less than 100%.

[0216] In the second direction Y, the width L8 of the electrode assembly 6 refers to the distance between the two edges of the electrode assembly 6 in the second direction Y, and the distance L9 between the opposite wall surfaces of the third housing wall 13 refers to the distance between the inner surfaces of the two third housing walls 13.

[0217] In the second direction Y, the ratio of the width L8 of the electrode assembly 6 to the distance L9 between the opposite wall surfaces of the two third housing walls 13 can be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%, or other values within the above range.

[0218] Thus, not only can the battery cell and even the battery device have a higher volume utilization rate, but also a certain supporting force can be provided by the electrode assembly 6 to reduce the degree of bending deformation of the third housing wall 13 in the second direction Y in the range close to the full length in the first direction X.

[0219] In some embodiments, the battery cell 10 further includes an electrode assembly 6, the shell 1 has a receiving space, the electrode assembly 6 is received in the receiving space, the first housing wall 11 is located at one side end of the shell body 15 in the gravity direction Z, the shell body 15 includes a fourth housing wall 14 oppositely arranged with the first housing wall 11 along the gravity direction Z, and in the gravity direction Z, the ratio of the height of the electrode assembly 6 to the distance between the opposite wall surfaces of the protruding portion 112 in the first housing wall 11 and the fourth housing wall 14 is greater than 80% and less than 100%.

[0220] Along the direction of gravity Z, the height of electrode assembly 6 refers to the distance between the two edges of electrode assembly 6 along the direction of gravity Z. In particular, along the direction of gravity Z, the height of electrode assembly 6 refers to the height of the laminate formed by the positive electrode and the negative electrode in the electrode assembly along the direction of gravity Z.

[0221] The distance between the opposing surfaces of the first housing wall 11 and the fourth housing wall 14 refers to the distance between the inner surface of the first housing wall 11 and the inner surface of the third housing wall 13.

[0222] Along the direction of gravity Z, the ratio of the height of the electrode assembly 6 to the distance between the protrusion 112 in the first housing wall 11 and the opposite wall surface of the fourth housing wall 14 can be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%, etc., or of course, other values ​​within the above range.

[0223] Therefore, not only can the battery cell and even the battery device have a high volume utilization rate, but the electrode assembly 6 can also provide a certain support force, reducing the degree of bending deformation of the first housing wall 11 along the gravity direction Z within a range close to the full length along the first direction X, and reducing the degree of bending deformation of the second housing wall 12 along the first direction X within a range close to the overall height along the gravity direction Z.

[0224] In some embodiments, such as Figure 5 and Figure 8 As shown, the length L1 of the first housing wall 11 along the first direction X is in the range of 120mm to 1200mm. The first direction X is perpendicular to the gravity direction Z and is consistent with the length direction of the battery cell 10.

[0225] The length L1 of the first housing wall 11 along the first direction X refers to the distance between the two edges of the first housing wall 11 along the first direction X.

[0226] Optionally, the length L1 of the first housing wall 11 along the first direction X can be 120mm, 150mm, 200mm, 250mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 1000mm, 1050mm, 1100mm, 1150mm, 1180mm or 1200mm, etc., or other values ​​within the above range.

[0227] Therefore, the embodiments of this application can be applied to battery cells of various lengths according to actual conditions, thereby producing a battery device that matches the installation space of the battery device and has high volume utilization and high energy.

[0228] In some embodiments, the length of the first housing wall 11 along the first direction X is in the range of 120mm to 600mm.

[0229] Optionally, the length L1 of the first housing wall 11 along the first direction X can be 120mm, 180mm, 220mm, 260mm, 320mm, 360mm, 420mm, 460mm, 520mm, 560mm or 600mm, etc., and of course, other values within the above range are also possible.

[0230] Thus, according to actual conditions, the embodiments of the present application can be applied to battery monomers of various length specifications, and thus a battery device with a high volume utilization rate and high energy that matches the installation space of the battery device can be made.

[0231] In some embodiments, the length of the first housing wall 11 along the first direction X is in the range of 150mm to 400mm.

[0232] Optionally, the length L1 of the first housing wall 11 along the first direction X can be 150mm, 160mm, 170mm, 210mm, 230mm, 270mm, 290mm, 310mm, 330mm, 370mm, 390mm or 400mm, etc., and of course, other values within the above range are also possible.

[0233] Thus, according to actual conditions, the embodiments of the present application can be applied to battery monomers of various length specifications, and thus a battery device with a high volume utilization rate and high energy that matches the installation space of the battery device can be made.

[0234] In some embodiments, as shown in Figs. 1 and 2, the first housing wall 11 is formed with a protruding portion 112 that abuts against the adjacent battery monomer 10 along the gravitational direction Z. Figure 5 and Figure 8 The length of the protruding portion 112 along the first direction X is in the range of 50% to 98% relative to the length of the first housing wall 11 along the first direction X.

[0235] The length of the protruding portion 112 along the first direction X refers to the distance between the two sides of the protruding portion 112 along the first direction X. Taking one protruding portion 112 as an example, the length of the protruding portion 112 along the first direction X is the length L2 as shown in Fig. 3; taking two protruding portions 112 as an example, the length of the protruding portion 112 along the first direction X is the sum of the length L3 and the length L4 as shown in Fig. 4; when there are more protruding portions 112, the length of the protruding portion 112 along the first direction X refers to the sum of the lengths of the protruding portions 112 along the first direction X. Figure 8 Figure 5 The length of the protruding portion 112 along the first direction X refers to the distance between the two sides of the protruding portion 112 along the first direction X. Taking one protruding portion 112 as an example, the length of the protruding portion 112 along the first direction X is the length L2 as shown in Fig. 3; taking two protruding portions 112 as an example, the length of the protruding portion 112 along the first direction X is the sum of the length L3 and the length L4 as shown in Fig. 4; when there are more protruding portions 112, the length of the protruding portion 112 along the first direction X refers to the sum of the lengths of the protruding portions 112 along the first direction X.

[0236] ​The ratio of the length L2 or the sum of the lengths L3 and L4 of the protrusion 112 along the first direction X to the length L1 of the first housing wall 11 along the first direction X can be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 82%, 84%, 87%, 90%, 92%, 95%, or 98%, etc., or of course, other values ​​within the above range.

[0237] Therefore, by designing the protrusion 112 to exceed half the length of the first housing wall 11 along the first direction X, a sufficiently large contact surface is provided to support, which is beneficial to improving the stacking stability along the gravity direction Z.

[0238] In some embodiments, such as Figure 4 As shown, the width L5 of the first shell wall 11 along the second direction Y is in the range of 12mm to 90mm, wherein the first direction X, the second direction Y and the gravity direction Z are perpendicular to each other.

[0239] The width L5 of the first housing wall 11 along the second direction Y refers to the distance between the two edges of the first housing wall 11 along the second direction Y.

[0240] Optionally, the width L5 of the first housing wall 11 along the second direction Y can be 12mm, 15mm, 17mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 70mm, 75mm, 80mm, 85mm, 87mm or 90mm, etc., or other values ​​within the above range.

[0241] Therefore, the embodiments of this application can be applied to battery cells of various widths according to actual conditions, thereby producing a battery device that matches the installation space of the battery device and has high volume utilization and high energy.

[0242] In some embodiments, such as Figure 4 As shown, the width L5 of the first housing wall 11 along the second direction Y is in the range of 25mm to 45mm.

[0243] Optionally, the width L5 of the first housing wall 11 along the second direction Y can be 25mm, 27mm, 29mm, 31mm, 33mm, 37mm, 39mm, 41mm, 43mm or 45mm, etc., or other values ​​within the above range.

[0244] Therefore, the embodiments of this application can be applied to battery cells of various widths according to actual conditions, thereby producing a battery device that matches the installation space of the battery device and has high volume utilization and high energy.

[0245] In some embodiments, such as Figure 5As shown, the maximum height H2 of the battery cell 10 along the gravity direction Z is in the range of 80mm to 250mm.

[0246] The maximum height H2 of the battery cell along the gravity direction Z refers to the distance between the two edges of the battery cell along the gravity direction Z that are farthest apart (for example Figure 5 As shown, along the gravity direction Z, the distance between the outer surface of the fourth shell wall 14 and the upper surface of the protrusion 112.

[0247] Optionally, the maximum height H2 of the battery cell along the gravity direction Z can be 80mm, 90mm, 100mm, 150mm, 200mm, 210mm, 220mm, 230mm, 240mm or 250mm, etc., and of course, other values within the above range are also possible.

[0248] Therefore, according to actual conditions, the embodiments of the present application can be applied to battery cells of various height specifications, and thus a battery device with a high volume utilization rate and high energy that matches the installation space of the battery device can be produced.

[0249] In some embodiments, the maximum height of the battery cell 10 along the gravity direction Z is in the range of 100mm to 200mm.

[0250] The maximum height of the battery cell 10 along the gravity direction Z is, for example, the distance from the surface of the protrusion 112 in the first shell wall 11 (the surface outside the outer shell 1) to the surface of the fourth shell wall 14 (the surface outside the outer shell 1).

[0251] Optionally, the maximum height H2 of the battery cell 10 along the gravity direction Z can be 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 1700mm, 1800mm, 190mm or 200mm, etc., and of course, other values within the above range are also possible.

[0252] Therefore, according to actual conditions, the embodiments of the present application can be applied to battery cells of various height specifications, and thus a battery device with a high volume utilization rate and high energy that matches the installation space of the battery device can be produced.

[0253] In some embodiments, the shell body 15 includes two second shell walls 12 arranged opposite along a first direction X, the first direction X being perpendicular to the gravity direction Z and consistent with the length direction of the battery cell 10, and the battery cell 10 further includes a pressure relief component 3, the pressure relief component 3 being provided on at least one second shell wall 12.

[0254] In some embodiments, the battery cell further includes a pressure relief component 3, the pressure relief component 3 being configured to open to discharge the internal gas of the battery cell when the battery cell experiences thermal runaway.

[0255] As an example, the internal pressure or temperature of the battery cell reaches a predetermined threshold value, and the actuation is triggered to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches the predetermined threshold value, the pressure relief component 3 performs an action or a weak structure provided in the pressure relief component 3 is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to the design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell.

[0256] As an example, the pressure relief component 3 can be integrally formed with the shell body 15.

[0257] As an example, the pressure relief component 3 can also be provided separately from the shell body 15 and connected thereto.

[0258] The "actuation" mentioned in the present application refers to the pressure relief component 3 performing an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action performed by the pressure relief component 3 can include but is not limited to: a component in the pressure relief component 3 moving to form an exhaust passage, at least a part of the pressure relief component 3 breaking, shattering, being torn or opening, etc. When the pressure relief component 3 is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as exhaust. In this way, the battery cell can be released at a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0259] In some embodiments, when the shell 1 is a non-sealed structure, the pressure relief component 3 can be provided as a through hole for discharging the gas inside the battery cell.

[0260] The exhaust from the battery cell mentioned in the present application includes but is not limited to: electrolyte, dissolved or split positive and negative plates, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0261] In some embodiments, as shown in Figures 5 to 9 The first shell wall 11 is one or both of the two shell walls in the shell 1 along the direction of gravity; the second shell wall 12 is a side wall connected to the first shell wall 11. Optionally, the pressure relief component 3 can be provided on both second shell walls 12, or the pressure relief component 3 can be provided on one of the second shell walls 12. The number of pressure relief components 3 can be one, two or other suitable number. The structure of the pressure relief component 3 itself can adopt a known structure.

[0262] Since the pressure relief component 3 is located at the second housing wall 12 instead of the first housing wall 11 where the electrode terminal is located, it is not necessary to leave a passage for discharging the pressure relief gas in the gravity direction Z, which is advantageous for reducing the space occupied by the plurality of battery monomers stacked in the gravity direction Z in the gravity direction Z, improving the volume utilization rate; moreover, it can reduce the probability of the eruption falling on the electrode terminal when the pressure relief component 3 is relieved, realize the separation of electricity and gas, and reduce the risk of short circuit and even fire caused by thermal runaway of the battery monomer.

[0263] In some embodiments, as shown in Figures 5 to 9 The shell body 15 also includes two third housing walls 13 arranged opposite in the second direction Y, and the area of the first housing wall 11 and the second housing wall 12 is smaller than the area of the third housing wall 13.

[0264] In some embodiments, the third housing wall 13 is a large face in the side wall of the housing wall. The pressure relief component is formed on the second housing wall 12, which means that the pressure relief component is not arranged on the large face.

[0265] Here, by way of example, the area of the first housing wall 11 can be calculated by projection in the projection plane perpendicular to the gravity direction, the area of the second housing wall 12 can be calculated by projection in the projection plane perpendicular to the first direction X, and the area of the third housing wall 13 can be calculated by projection in the projection plane perpendicular to the second direction Y. Thus, since the pressure relief component 3 is not formed on the third housing wall 13 with a larger area, the space occupied by the passage for discharging the pressure relief gas can be reduced, further improving the space utilization rate in the battery device.

[0266] In some embodiments, as shown in Figures 11 to 17 The plurality of battery monomers 10 form a plurality of battery monomer groups 30, each battery monomer group 30 including a plurality of battery monomers 10 stacked in the gravity direction Z, and the plurality of battery monomer groups 30 include a first battery monomer group 301 and a second battery monomer group 302, the first battery monomer group 301 and the second battery monomer group 302 being arranged along the first direction X with an interval 4 therebetween, and at least some of the battery monomers 10 in the first battery monomer group 301 and / or at least some of the battery monomers 10 in the second battery monomer group 302 are arranged such that the respective pressure relief component 3 faces the interval 4.

[0267] The interval 4 is used to form a pressure relief space at least for containing the discharge from the pressure relief component 3; when there are more intervals 4 communicating with each other, a larger pressure relief space or pressure relief passage can be formed. Optionally, the pressure relief space or pressure relief passage can be communicated with the external space.

[0268] In some embodiments, a plurality of battery cells 10 are stacked along the gravity direction Z to form a battery cell group 30, and two, three, four or more battery cells 10 can be stacked along the gravity direction Z to form a battery cell group 30. The number of battery cells 10 in each battery cell group 30 can be determined according to the height of the accommodating space of the box of the battery device and the height of the battery cell 10 itself. The number of battery cells in each battery cell group can be the same or different.

[0269] In some embodiments, a plurality of battery cell groups 30 include a first battery cell group 301 and a second battery cell group 302, and the first battery cell group 301 and the second battery cell group 302 are arranged with a spacing 4 (see Figure 13 ) in the first direction X. The pressure relief components 3 of some battery cells in the first battery cell group 301 can be directed towards the spacing 4 (see Figure 11 , Figure 12 and Figure 16 ); the pressure relief components 3 of some battery cells 10 in the second battery cell group 302 can be directed towards the spacing 4 (see Figure 13 ), and the pressure relief components 3 of all battery cells 10 in the first battery cell group 301 can be directed towards the spacing 4 (see Figure 11 , Figure 12 and Figure 16 ).

[0270] It should be noted that for those pressure relief components 3 that are not directed towards the spacing 4, other spacings can be further provided to form pressure relief spaces for those pressure relief components 3.

[0271] Since a plurality of battery cells 10 form a plurality of battery cell groups 30, each battery cell group 30 includes a plurality of battery cells 10 stacked along the gravity direction Z, the battery device 100 can include more battery cells and be able to provide higher energy; since at least some battery cells in the first battery cell group 301 and / or at least some battery cells in the second battery cell group 302 are arranged with their respective pressure relief components 3 directed towards the spacing 4, the first battery cell group 301 and the second battery cell group 302 can share the spacing 4, which is conducive to improving the space utilization in the battery device; and the pressure relief components 3 of some battery cells can be directed towards the spacing 4, which is also conducive to flexibly designing the arrangement direction of the battery cells.

[0272] In some embodiments, as Figure 11 , Figure 12 and Figure 16As shown, the first battery cell group 301 and the second battery cell group 302 are arranged such that the pressure relief components 3 of the battery cells 10 in the first battery cell group 301 and the pressure relief components 3 of the battery cells 10 in the second battery cell group 302 are both directed towards the space 4.

[0273] The space 4 can be determined according to the size of the battery device, the size of the battery cells 10, the amount of discharge of the pressure relief components 3, and the like, and the width of the space 4 in the first direction X can also be considered from the perspective of inhibiting heat diffusion. Of course, a partition 9 can also be added to the space 4 for inhibiting heat diffusion. Here, heat diffusion refers to the phenomenon that the thermal runaway of one battery cell triggers the thermal runaway of the remaining battery cells in succession.

[0274] In the same projection plane perpendicular to the first direction X, the projections of the pressure relief components 3 of the battery cells 10 in the first battery cell group 301 and the projections of the pressure relief components 3 of the battery cells 10 in the second battery cell group 302 can partially overlap, or fully overlap, or not overlap at all. Alternatively, along the first direction X, the first battery cell group 301 and the second battery cell group 302 can have a partition 9 therebetween, and in the same projection plane perpendicular to the first direction X, the projections of the pressure relief components 3 of the battery cells 10 in the first battery cell group 301 are within the range of the projection of the partition 9, and the projections of the pressure relief components 3 of the battery cells 10 in the second battery cell group 302 are also within the range of the projection of the partition 9. Thus, the first battery cell group 301 and the second battery cell group 302 share the space 4, which is conducive to improving the space utilization in the battery device.

[0275] In some embodiments, as shown in FIG. 1, the pressure relief components 3 of the battery cells 10 in the first battery cell group 301 and the pressure relief components 3 of the battery cells 10 in the second battery cell group 302 are staggered along the direction of gravity Z, and in the same projection plane perpendicular to the first direction X, the projections of the pressure relief components 3 of the battery cells 10 in the first battery cell group 301 and the projections of the pressure relief components 3 of the battery cells 10 in the second battery cell group 302 do not overlap. Figure 12

[0276] In some embodiments, as shown in FIG. 1, the pressure relief components 3 of the battery cells 10 in the first battery cell group 301 and the pressure relief components 3 of the battery cells 10 in the second battery cell group 302 are staggered along the direction of gravity Z, and in the same projection plane perpendicular to the first direction X, the projections of the pressure relief components 3 of the battery cells 10 in the first battery cell group 301 and the projections of the pressure relief components 3 of the battery cells 10 in the second battery cell group 302 do not overlap. Figure 12 ​As shown, the pressure relief components 3 of each battery cell in the first battery cell group 301 and the pressure relief components 3 of each battery cell in the second battery cell group 302 are offset along the gravitational direction Z. That is, along the gravitational direction Z, the pressure relief components 3 of each battery cell in the first battery cell group 301 and the pressure relief components 3 of each battery cell in the second battery cell group 302 are not at the same height. Furthermore, in the same projection plane perpendicular to the first direction X, the projections of the pressure relief components 3 of each battery cell 10 in the first battery cell group 301 and the projections of the pressure relief components 3 of each battery cell 10 in the second battery cell group 302 are arranged along the gravitational direction Z and are completely offset (the two projections are separated from each other).

[0277] Therefore, since the pressure relief components 3 of the battery cells are completely offset along the direction of gravity Z, the probability of the ejected material from the pressure relief components 3 contaminating or damaging the pressure relief components 3 of the opposite battery cells can be effectively reduced, and the risk of thermal runaway of the battery cells along the first direction X can be further reduced.

[0278] Of course, they don't have to be completely offset. For example, in the same projection plane perpendicular to the first direction X, the projection of the pressure relief component 3 of each battery cell 10 in the first battery cell group 301 does not overlap with the projection of the pressure relief component 3 of each battery cell 10 in the second battery cell group 302.

[0279] In some embodiments, such as Figure 13 As shown, in the same battery cell group 30, the pressure relief component 3 of at least one battery cell 10 has a different orientation than the pressure relief components 3 of the other battery cells 10.

[0280] The direction in which the opening of the pressure relief component 3 faces is called the orientation of the pressure relief component.

[0281] Optionally, in the same battery cell group 30, the pressure relief components 3 of one, two, three or more battery cells may have different orientations than the pressure relief components 3 of other battery cells.

[0282] In a specific embodiment, such as Figure 13 As shown, in the same battery cell group 30, the pressure relief component 3 of a portion of the battery cells can be oriented to one side along the first direction X, while the pressure relief component 3 of another portion of the battery cells can be oriented to the other side along the first direction X.

[0283] Therefore, not only can the arrangement orientation of battery cells be flexibly designed, but also the probability of the ejected material from the pressure relief component 3 contaminating or damaging the pressure relief component 3 of the adjacent battery cells along the gravity direction Z can be reduced, thereby reducing the risk of thermal diffusion along the gravity direction Z when the battery cells experience thermal runaway.

[0284] In some embodiments, such as Figure 13As shown, in the same battery cell group 30, the pressure relief components 3 of the battery cells adjacent in the gravity direction Z are opposite in the orientation in the first direction X, and in the same layer, the pressure relief components 3 of the battery cells in the first battery cell group 301 and the second battery cell group 302 are the same in the orientation in the first direction X.

[0285] In the case where the battery device has a plurality of battery cell groups each including a plurality of battery cells stacked in the gravity direction Z, the battery cells at the same height can be referred to as a layer of battery cells, that is, the array of battery cells arranged by the plurality of battery cell groups can include a plurality of layers of battery cells. For example, Figure 13 For example, the battery cells in the same layer can be the battery cells 10 in the first battery cell group 301 and the battery cells 10 in the second battery cell group 302 in the first layer from the top, or the battery cells 10 in the first battery cell group 301 and the battery cells 10 in the second battery cell group 302 in the second layer or another layer from the top.

[0286] In one specific embodiment, in the first battery cell group 301, the pressure relief components 3 of the battery cells adjacent in the gravity direction Z are opposite in the orientation in the first direction X, for example, in adjacent battery cells, the pressure relief component 3 of one of the battery cells is oriented in the first direction X toward the second battery cell group 302, and the pressure relief component 3 of the other battery cell is oriented in the first direction X toward the side away from the second battery cell group 302.

[0287] In the same layer in the gravity direction Z, the pressure relief components 3 of the battery cells in the first battery cell group 301 and the second battery cell group 302 are the same in the orientation in the first direction X (for example Figure 13 As shown, all are oriented to the left or right side). For example, the pressure relief components 3 of the battery cells in the first battery cell group 301 and the second battery cell group 302 in the first layer from the top are all oriented to the left side of the figure, and the pressure relief components 3 of the battery cells in the first battery cell group 301 and the second battery cell group 302 in the second layer from the top are all oriented to the right side of the figure.

[0288] Thus, since the directions of the pressure relief components 3 of the battery cells adjacent in the gravity direction Z are opposite in the first direction X in the same battery cell group 30, the probability that the eruption of the pressure relief components 3 pollutes or damages the pressure relief components 3 of the battery cells adjacent in the gravity direction Z can be reduced; since the directions of the pressure relief components 3 of the battery cells are the same in the first direction X in the same layer, the eruption of the pressure relief components 3 hardly pollutes or damages the pressure relief components 3 of the battery cells on the opposite side. Therefore, the risk of thermal diffusion in the gravity direction Z and the risk of thermal diffusion in the first direction X can be reduced.

[0289] In some embodiments, the battery cells 10 in the first battery cell group 301 and the battery cells 10 in the second battery cell group 302 are arranged such that the directions of the pressure relief components 3 of the battery cells are the same (not shown).

[0290] It should be noted that, for the first battery cell group 301 and the second battery cell group 302 in which the directions of the pressure relief components 3 are the same, a pressure relief space (pressure relief channel) for containing the eruption of the pressure relief components 3 can be provided respectively.

[0291] Thus, since the directions of the pressure relief components 3 of the battery cells are the same, the eruption of the pressure relief components 3 hardly pollutes or damages the pressure relief components 3 of the battery cells on the opposite side in the first direction X, and the risk of thermal diffusion in the first direction X can be reduced; and the manufacturing and grouping of the battery cells are facilitated, and the assembly efficiency of the battery device is improved.

[0292] In some embodiments, as shown in Figure 14 , the plurality of battery cell groups 30 further includes a third battery cell group 303, and in combination with Figure 11 and Figure 12 , the directions of the pressure relief components 3 of the battery cells of the third battery cell group 303 in the first direction X are the same as the directions of the pressure relief components 3 of the battery cells of the first battery cell group 301 in the first direction X, and the second battery cell group 302 is located between the first battery cell group 301 and the third battery cell group 303 in the first direction X.

[0293] In a specific embodiment, in Figure 11 and Figure 14To illustrate with an example, the first battery cell group 301, the second battery cell group 302, and the third battery cell group 303 are arranged along the first direction X. The pressure relief components 3 of each battery cell in the third battery cell group 303 face the same direction along the first direction X as the pressure relief components 3 of each battery cell in the first battery cell group 301. For example, the pressure relief components 3 of each battery cell face the right side of its battery cell group, while the pressure relief components 3 of each battery cell in the second battery cell group 302 face the left side of its battery cell group. The second housing wall of the third battery cell group 303 and the second housing wall of the third battery cell group 303 can be close to or in contact with each other.

[0294] This allows for the flexible arrangement of more battery cells, resulting in high grouping efficiency. Furthermore, the third battery cell group 303 is located on the side of the second battery cell group 302 facing away from the first battery cell group 301 along the first direction X, and the pressure relief component 3 is located on the side of the third battery cell group 303 facing away from the second battery cell group 302. Therefore, the second battery cell group 302 and the third battery cell group 303 can be arranged close to or even in contact with each other along the first direction X, thereby further improving space utilization and the energy of the battery device.

[0295] In some embodiments, such as Figure 17 As shown, multiple battery cells 10 form multiple battery cell groups 30. Each battery cell group 30 includes multiple battery cells stacked along the gravitational direction Z. The multiple battery cell groups 30 include a second battery cell group 302 and a third battery cell group 303. The second battery cell group 302 and the third battery cell group 303 are arranged along a first direction X. The pressure relief components 3 of each battery cell in the third battery cell group 303 are oriented along the first direction X in a direction away from the second battery cell group 302, and the pressure relief components 3 of each battery cell in the second battery cell group 302 are oriented along the first direction X in a direction away from the third battery cell group 303. The second housing wall of the third battery cell group 303 facing the second battery cell group 302 and the second housing wall of the second battery cell group 302 facing the third battery cell group 303 can be close to or in contact with each other. This allows the pressure relief components 3 of the two battery cell groups to be further apart, significantly reducing the risk of thermal runaway of the battery cell along the first direction X. In addition, the channels for discharging the gas ejected by the pressure relief components 3 can be arranged on both sides of the two battery cell groups, which is beneficial for the utilization of the space on both sides.

[0296] The arrangement of the first battery cell group 301 and the second battery cell group 302, and the arrangement of the second battery cell group 302 and the third battery cell group 303 described above can be combined. For example, Figure 14The arrangement can be considered as a combination of the arrangement of the first battery cell group 301 and the second battery cell group 302, the arrangement of the second battery cell group 302 and the third battery cell group 303, and the arrangement of the first battery cell group 301 and the second battery cell group 302 (the arrangement of the third battery cell group 303 and the fourth battery cell group 304 is the same as the arrangement of the first battery cell group 301 and the second battery cell group 302).

[0297] In some embodiments, such as Figure 16 As shown, the first housing wall 11 is located at one end of the housing body 15 along the gravity direction Z. The housing body 15 includes a fourth housing wall 14 disposed opposite to the first housing wall 11 along the gravity direction Z. Multiple battery cells 10 form multiple battery cell groups 30. Each battery cell group 30 includes multiple battery cells 10 stacked along the gravity direction Z. In the same battery cell group 30, the first housing wall 11 of the lower one of two adjacent battery cells 10 along the gravity direction Z abuts against the fourth housing wall 14 of the upper one; or, in the same battery cell group 30, the first housing wall 11 of the upper one of two adjacent battery cells 10 along the gravity direction Z abuts against the fourth housing wall 14 of the lower one.

[0298] In some embodiments, along the gravity direction Z, the first housing wall 11 and the fourth housing wall 14 are located on opposite sides of the outer casing 1. If the first housing wall 11 being located above the gravity direction Z is referred to as "upright," then the fourth housing wall 14 being located above the gravity direction Z is referred to as "inverted." The individual battery cells 10 can be stacked upright, inverted, or a combination of both.

[0299] In some embodiments, with Figure 16 The orientation shown is illustrated by example. The first housing wall 11 can be located on the upper side of the outer shell 1, and the fourth housing wall 14 can be located on the lower side of the outer shell 1, as shown. Figure 16 In the fifth battery cell group 305 shown, in the same battery cell group, along the direction of gravity Z, the first shell wall 11 of the lower battery cell abuts against the fourth shell wall 14 of the upper battery cell. That is, in the fifth battery cell group 305, the battery cells 10 are stacked upright.

[0300] In some embodiments, with Figure 16 The orientation shown is illustrated by example. The first housing wall 11 can be located on the lower side of the outer shell 1, and the fourth housing wall 14 can be located on the upper side of the outer shell 1, as shown. Figure 16The sixth battery cell group 306 shown is one in which, in the same battery cell group, the first case wall 11 of the battery cell located above and the fourth case wall 14 of the battery cell located below abut in the gravitational direction Z. That is, in the sixth battery cell group 306, the battery cells 10 are stacked upside down.

[0301] Each battery cell group in the battery device can be either the fifth battery cell group 305 or the sixth battery cell group 306, and of course, the battery device can include both the fifth battery cell group 305 and the sixth battery cell group 306. In addition, the upright and upside-down placement of the battery cells can be combined with some or all of the first battery cell group 301, the second battery cell group 302, the third battery cell group 303, and the fourth battery cell group 304 described above. For example, the staggered arrangement of the pressure relief members 3 in adjacent battery cell groups can be achieved by stacking the battery cells 10 upright and upside down.

[0302] Thus, the battery cells can be stacked with the first case wall 11 (electrode terminal) facing upward, stacked with the first case wall 11 (electrode terminal) facing downward, or a mixture of the two. Therefore, not only is the flexibility of the arrangement of the orientation of the battery cells improved, but the pressure relief members 3 are easily staggered by changing the orientation of the battery cells, so that it is not necessary to prepare two types of battery cells with different positions of the pressure relief members 3, which is advantageous in simplifying the manufacturing process of the battery cells, improving production efficiency, and reducing production costs.

[0303] In some embodiments, as shown in FIG. 1A, the first case wall 11 of each battery cell 10 is located on the same side of the case 1 in the gravitational direction Z (e.g., the upper side or the lower side as shown in FIG. 1A). Figures 11 to 15 or Figure 17 In some embodiments, as shown in FIG. 1A, the first case wall 11 of each battery cell 10 is located on the same side of the case 1 in the gravitational direction Z (e.g., the upper side or the lower side as shown in FIG. 1A). Figure 11 That is, all of the battery cells 10 are upright or all are upside down.

[0304] Thus, all of the battery cells can be arranged in the same orientation in the gravitational direction Z, which is advantageous in simplifying the assembly process.

[0305] In some embodiments, as shown in FIG. 1A, the first case wall 11 of each battery cell 10 is located on the same side of the case 1 in the gravitational direction Z (e.g., the upper side or the lower side as shown in FIG. 1A). Figure 16 In some embodiments, as shown in FIG. 1A, the first case wall 11 of each battery cell 10 is located on the same side of the case 1 in the gravitational direction Z (e.g., the upper side or the lower side as shown in FIG. 1A). Thus, the battery cells can be stacked with the first case wall 11 (electrode terminal) facing upward, stacked with the first case wall 11 (electrode terminal) facing downward, or a mixture of the two. Therefore, not only is the flexibility of the arrangement of the orientation of the battery cells improved, but the pressure relief members 3 are easily staggered by changing the orientation of the battery cells, so that it is not necessary to prepare two types of battery cells with different positions of the pressure relief members 3, which is advantageous in simplifying the manufacturing process of the battery cells, improving production efficiency, and reducing production costs.

[0306] In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5). Figure 16 In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5). Figure 16 In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5). Figure 16 In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5).

[0307] In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5). Figure 16 In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5). Figure 16 In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5). Figure 3 In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5).

[0308] In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5).

[0309] In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5).

[0310] In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5). Figure 6 In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5). Figure 10 In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5). Figures 11 to 17 In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5).

[0311] In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5).

[0312] In one embodiment, the orientation is illustrated in FIG. 5, in which the first housing wall 11 of each battery cell is located on the first side of the case 1 along the gravity direction Z (e.g., the upper side as shown in FIG. 5), and the fourth housing wall 14 of each battery cell is located on the second side of the case 1 along the gravity direction Z (e.g., the lower side as shown in FIG. 5).

[0313] The arrangement in close proximity includes being arranged close to each other, being arranged in contact. In addition, optionally, a spacer can be arranged between the third shell walls 13 adjacent in the second direction Y, which spacer can be, for example, a heat insulation pad, a cushion, a heat conduction pad, etc.

[0314] Thus, the battery device can include more battery monomers, and therefore, the group efficiency can be improved, the space utilization can be improved, and the energy of the battery device can be improved.

[0315] In some embodiments, the shell 1 further includes two second shell walls 12 arranged opposite in the first direction X, and the pressure relief component 3 is arranged on at least one second shell wall 12, and the adjacent battery monomers 10 abut each other in the second direction Y.

[0316] Since the pressure relief component 3 is arranged on the second shell wall 12, it is not necessary to leave a pressure relief channel between the battery monomers arranged in the gravitational direction Z and the second direction Y, so that the space occupation in the gravitational direction Z and the second direction Y can be reduced, the space utilization can be improved, and the electrical and gas separation can be realized.

[0317] In some embodiments, as shown in Figure 13 , one side or both sides of each battery monomer group in the first direction X has a channel extending in the second direction Y, and the pressure relief port of the pressure relief component 3 faces the channel (for example, the first channel 41 or the second channel 42 shown in Figure 13 ) in the first direction X and communicates with the channel.

[0318] In some embodiments, along the first direction X, there is a gap 4 between adjacent battery monomer groups, and along the second direction Y, adjacent gaps 4 form a channel (for example, the first channel 41 or the second channel 42 shown in Figure 11 ), and the eruption material erupted when the battery monomer has thermal runaway can enter the channel.

[0319] In some specific embodiments, as shown in Figure 12 , Figure 16 , Figure 17 or Figure 11 , one side of each battery monomer group in the first direction X has a channel extending in the second direction Y, which is exemplified in the orientation shown in Figure 13 , there is a channel on the right side of the first battery monomer group 301, and there is a channel on the left side of the second battery monomer group 302.

[0320] In some specific embodiments, as shown in Figure 13 , both sides of each battery monomer group in the first direction X have a channel extending in the second direction Y, which is exemplified in the orientation shown in Figure 11 . Each of the left and right sides of the first battery monomer group 301 has a channel.

[0321] By designing the number and position of the channels and making the pressure relief ports of each battery cell face the channels, the eruption material erupted when any one battery cell experiences thermal runaway can enter the channels, reducing the impact of the eruption material on adjacent battery cells and the like, thereby reducing the risk of thermal propagation.

[0322] In some embodiments, as shown in Figure 12 and Figure 11 , the plurality of battery cell groups includes a plurality of first battery cell groups 301 and a plurality of second battery cell groups 302, the plurality of first battery cell groups 301 and the plurality of second battery cell groups 302 are arranged along the second direction Y respectively, and each first battery cell group 301 and each second battery cell group 302 are oppositely arranged along the first direction X at intervals, the intervals 4 are communicated along the second direction Y to form the first channel 41, and the pressure relief parts 3 of each battery cell in the first battery cell group 301 and the pressure relief parts 3 of each battery cell in the second battery cell group 302 all face and communicate with the first channel 41 along the first direction X.

[0323] In some embodiments, the plurality of first battery cell groups 301 are arranged along the second direction Y, the plurality of second battery cell groups 302 are arranged along the second direction Y, each first battery cell group 301 and each second battery cell group 302 are oppositely arranged along the first direction X at intervals, the intervals 4 are communicated along the second direction Y to form the first channel 41, and the pressure relief parts 3 of each battery cell in the first battery cell group 301 and the pressure relief parts 3 of each battery cell in the second battery cell group 302 all face and communicate with the first channel 41 along the first direction X.

[0324] Thus, the first battery cell group 301 and the second battery cell group 302 can share the first channel 41, which is conducive to improving the space utilization rate in the battery device.

[0325] In some embodiments, as shown in Figure 14 and Figure 14 , the first channel 41 includes a first passage 411 and a second passage 412, and the first passage 411 and the second passage 412 are separated in the first direction X by a partition 9.

[0326] In some embodiments, the first channel 41 has a partition 9, which separates the first channel 41 into a first passage 411 and a second passage 412 arranged along the first direction X, the pressure relief ports of the pressure relief parts 3 of the battery cells in the first battery cell group 301 communicate with the first passage 411, and the pressure relief ports of the pressure relief parts 3 of the battery cells in the second battery cell group 302 communicate with the second passage 412.

[0327] Thus, the pressure relief components 3 opposite along the first direction X can be reliably separated by the partition 9, so as to further reduce the risk of the pressure relief components 3 of the battery cells opposite along the first direction X being polluted or damaged by the eruption matter when the battery cells are in thermal runaway, and further reduce the risk of the battery cells along the first direction X being in thermal spread.

[0328] In some embodiments, as shown in Figure 14 the distance D2 between the second housing walls 12 facing the first channel 41 along the first direction X is in the range of 14mm to 20mm.

[0329] By having a suitable distance between the two second housing walls 12 opposite along the first direction X facing the first channel 41, both the space utilization and the risk of thermal spread can be considered.

[0330] In some embodiments, as shown in Figure 14 the distance D1 between the second housing walls 12 facing the first channel 41 along the first direction X and the partition 9 is in the range of 7mm to 10mm.

[0331] Thus, on the one hand, the pressure relief components 3 opposite along the first direction X are reliably separated by the partition 9, and on the other hand, a suitable pressure relief passage is left for the pressure relief components 3 on both sides of the partition 9, so as to both reduce the risk of the pressure relief components 3 of the battery cells opposite along the first direction X being polluted or damaged by the eruption matter when the battery cells are in thermal runaway, and reduce the risk of local overheating due to limited pressure relief space, which in turn leads to larger-scale thermal runaway and other adverse conditions.

[0332] In some embodiments, as shown in Figure 17 and Figure 14 the plurality of battery cell groups further comprises a plurality of third battery cell groups 303, the plurality of third battery cell groups 303 are arranged along the second direction Y, and along the first direction X, the second battery cell groups 302 are located between the first battery cell groups 301 and the third battery cell groups 303; along the first direction X, the first channel 41 is formed on the side of the second battery cell groups 302 close to the first battery cell groups 301, and the second channel 42 is formed on the side of the third battery cell groups 303 away from the second battery cell groups 302, and the pressure relief components 3 of the battery cells in the first battery cell groups 301 and the pressure relief components 3 of the battery cells in the second battery cell groups 302 are both along the first direction X towards the first channel 41 and communicate with the first channel 41, and the pressure relief components 3 of the battery cells in the third battery cell groups 303 are along the first direction X towards the second channel 42 and communicate with the second channel 42.

[0333] In a specific embodiment, as shown in Figure 17 and Figures 4 to 9As shown, the first battery cell group 301, the second battery cell group 302 and the third battery cell group 303 are arranged along the first direction X, wherein the first battery cell group 301 and the second battery cell group 302 are arranged at intervals along the first direction X, along the first direction X, the first channel 41 is located between the first battery cell group 301 and the second battery cell group 302, and the pressure relief components 3 of the battery cells in the first battery cell group 301 and the pressure relief components 3 of the battery cells in the second battery cell group 302 are both communicated with the first channel 41 towards the first channel 41; along the first direction X, the second battery cell group 302 and the third battery cell group 303 are arranged in close proximity, and the second channel 42 is located on the side of the third battery cell group 303 facing away from the second battery cell group 302, and the pressure relief components 3 of the battery cells in the third battery cell group 303 are communicated with the second channel 42 towards the second channel 42.

[0334] Thus, the space utilization can be improved in the case of arranging more battery cells, and a pressure relief channel can be provided for each battery cell to reduce the risk of heat diffusion.

[0335] In some embodiments, the plurality of battery cell groups 30 includes a plurality of first battery cell groups 301 and a plurality of second battery cell groups 302, the channel includes a first channel 41 and a second channel 42, the plurality of first battery cell groups 301 and the plurality of second battery cell groups 302 are arranged along the second direction Y respectively, and each first battery cell group 301 and each second battery cell group 302 are arranged along the first direction X at intervals of a spacing 4 along the first direction X, the spacing 4 is communicated along the second direction Y to form the first channel 41, along the first direction X, the first channel 41 is located on the side of the second battery cell group 302 close to the first battery cell group 301, and the second channel 42 is located on the side of the second battery cell group 302 facing away from the first battery cell group 301, the pressure relief components 3 of each battery cell in the first battery cell group 301 are communicated with the first channel 41 towards the first channel 41 along the first direction X, and the pressure relief components 3 of each battery cell in the second battery cell group 302 are communicated with the second channel 42 towards the second channel 42 along the first direction X.

[0336] In one specific embodiment, the first battery cell group 301 and the second battery cell group 302 are arranged at intervals along the first direction X, along the first direction X, the first channel 41 is located between the first battery cell group 301 and the second battery cell group 302, and the pressure relief components 3 of the battery cells in the first battery cell group 301 are communicated with the first channel 41 towards the first channel 41; along the first direction X, the second channel 42 is located on the side of the second battery cell group 302 facing away from the first battery cell group 301, and the pressure relief components 3 of the battery cells in the second battery cell group 302 are communicated with the second channel 42 towards the second channel 42.

[0337] Since the pressure relief component 3 of the first battery cell group 301 and the pressure relief component 3 of the second battery cell group 302 respectively relieve pressure through two pressure relief channels, the eruption of the pressure relief component 3 when relieving pressure will hardly contaminate or damage the pressure relief component 3 of the battery cell on the opposite side. It can be seen that the risk of thermal diffusion in the first direction X when the battery cell is in thermal runaway can be reliably reduced.

[0338] In some embodiments, as shown in Figure 6 The battery cell 10 further comprises an electrode assembly 6; the housing 1 has a receiving space, the electrode assembly 6 is received in the receiving space, the electrode terminal comprises a first electrode terminal plate 21 and a second electrode terminal plate 22, the first electrode terminal plate 21 and the second electrode terminal plate 22 are located on the side of the first shell wall 11 away from the electrode assembly 6 along the gravity direction Z, and the projection of the first electrode terminal plate 21 and the projection of the second electrode terminal plate 22 at least partially overlap in the same projection plane perpendicular to the second direction Y.

[0339] Optionally, the electrode terminal can be two, three, or four, etc., including electrode terminals with opposite polarities. When the electrode terminal is two, the polarities of the two electrode terminals can be opposite. The two electrode terminals can be one negative and the other positive.

[0340] Optionally, the electrode terminal plate can be a cuboid, a triangular prism, an "L" shape, or other irregular shapes, etc. The shapes of the first electrode terminal plate 21 and the second electrode terminal plate 22 can be the same or different.

[0341] The projection of the first electrode terminal plate 21 and the projection of the second electrode terminal plate 22 can partially or almost completely overlap in the same projection plane perpendicular to the second direction Y.

[0342] It should be noted that each electrode terminal, in addition to including an electrode terminal plate, can also include other constituent components, for example, it can also include an electrode terminal disc for connecting with the tab, and a connecting column for connecting the electrode terminal plate with the electrode terminal disc. In addition, an insulating member or the like can be further provided between the battery terminal and the first shell wall 11. The structure of the battery terminal can adopt the existing structure, which will not be traced here.

[0343] In this way, the first electrode terminal plate 21 and the second electrode terminal plate 22 can be arranged compactly along the first direction X, reducing the position space occupied in the first direction X, so that the protruding portion 112 can be designed larger, improving the support stability; moreover, designing the protruding portion 112 larger is conducive to improving the support area, thereby being conducive to improving the support strength and support rigidity, and being conducive to stacking more battery cells along the gravity direction Z.

[0344] In some embodiments, as shown in Figure 6As shown, the first electrode terminal plates 21 and the second electrode terminal plates 22 of the battery cells 10 located at the same layer along the gravity direction Z are alternately arranged along the second direction Y, the first electrode terminal plates 21 and the second electrode terminal plates 22 are opposite in polarity, and the battery device further comprises the busbar 7, the adjacent first electrode terminal plates 21 and the second electrode terminal plates 22 in the two battery cells adjacent along the second direction Y are connected by the busbar 7.

[0345] In the battery cells located at the same layer along the gravity direction Z and in the battery cells adjacent along the second direction Y, the electrode terminal plates located in different battery cells and close to each other along the second direction Y are opposite in polarity, thereby facilitating the electrical connection between the battery cells adjacent along the second direction Y by the busbar 7.

[0346] Therefore, the electrical connection between the battery cells adjacent along the second direction Y can be easily realized.

[0347] In some embodiments, as shown, Figure 6 The first housing wall 11 is formed with a protruding portion 112, the protruding portion 112 abuts against the adjacent battery cell 10 along the gravity direction Z, and the busbar 7 does not protrude beyond the protruding portion 112 along the gravity direction Z towards the side of the protruding portion 112.

[0348] Optionally, as exemplified in the Figure 3 direction shown, the busbar 7 can be substantially flush with the protruding portion 112 along the gravity direction Z towards the side of the protruding portion 112, and the busbar 7 can also be lower than the protruding portion 112.

[0349] Therefore, the dimension of the battery cell group along the gravity direction Z will not increase due to the arrangement of the busbar 7, and thus the volume utilization rate can be improved.

[0350] In some embodiments, as shown, Figure 10 and Figure 10 As shown, the battery device 100 comprises a plurality of battery cell layers along the gravity direction Z, each battery cell layer is stacked along the gravity direction Z, the same battery cell layer comprises a plurality of battery cells 10, and the battery device 100 further comprises a plurality of support plates 8 located between the battery cell layers adjacent along the gravity direction Z, and the adjacent battery cell layers abut against each other through the support plates 8.

[0351] It should be noted that, Figures 10 to 14 Only one battery cell layer is shown, and the battery cell layer can have multiple layers along the gravity direction Z.

[0352] In some embodiments, the same battery cell layer comprises a plurality of battery cells 10 arranged along the first direction X and / or along the second direction Y, and the support plate 8 is arranged between adjacent battery cell layers along the gravity direction Z, and the adjacent battery cell layers abut each other through the support plate 8.

[0353] In some embodiments, the shape of the support plate 8 is not limited in the present application. For example, the support plate 8 can be plate-shaped, thereby reducing the size of the support plate 8 along the gravity direction Z, and further reducing the height of the battery device.

[0354] In this way, the pressure borne by the lower layer of battery cells 10 can be dispersed, and the stacking stability along the gravity direction Z can be improved, which is conducive to increasing the number of stacked layers along the gravity direction Z, and improving the volume utilization and energy of the battery device.

[0355] In some embodiments, as shown in Figure 16 , Figure 17 or Figure 3 , in the same battery cell layer, part or all of the plurality of battery cells arranged along the first direction X abut the same support plate 8; and / or, in the same battery cell layer, part or all of the plurality of battery cells arranged along the second direction Y abut the same support plate 8; and / or, the support plate 8 is configured to be at least surface-insulating; and / or, along the gravity direction Z, the battery cell is at least one side bonded to the support plate 8.

[0356] In the same battery cell layer, at least part or all of the battery cells abut the same support plate 8, wherein part of the plurality of battery cells arranged along the first direction X abut the same support plate 8, and part of the plurality of battery cells arranged along the second direction Y abut the same support plate 8, thereby dispersing the pressure borne by the lower layer of battery cells, and improving the integrity of the battery cells in the same battery cell layer.

[0357] In some embodiments, the support plate 8 is configured to be at least surface-insulating. Optionally, the support plate 8 can be an insulating material, such as insulating resin; or the support plate 8 can be made of steel, aluminum, titanium, etc., wherein the outer surface of the support plate 8 has an insulating coating.

[0358] In some embodiments, along the gravity direction Z, the battery cell is at least one side bonded to the support plate 8, for example, by structural adhesive bonding.

[0359] In this way, the pressure borne by the lower layer of battery cells can be dispersed, and the integrity of the battery cells in the same battery cell layer can be improved, and the stacking stability along the gravity direction Z can be further improved; and the insulating property of the support plate 8 is conducive to reducing the risk of electric leakage.

[0360] In some embodiments, as shown in Figure 3As shown, the battery device 100 further comprises a box 20, at least one end of the support plate 8 is supported on a box wall 201 of the box; and / or, the battery device 100 further comprises a box 20 and a beam member (not shown) provided on the box, at least one end of the support plate 8 is supported on the beam member (not shown).

[0361] In some embodiments, as shown in Figure 3 The battery device comprises a box 20, which can comprise a first box 20A and a second box 20B. The first box 20A and the second box 20B are fastened so that an enclosed space is formed inside the box 20 to accommodate the battery cell group. Here, enclosed means covered or closed, which can be sealed or unsealed. The first box 20A can be a top cover or a bottom plate.

[0362] In some embodiments, at least one end of the support plate 8 is supported on the box wall 201 of the box, further, both ends of the support plate 8 along the first direction X are supported on the box wall 201 of the box, and both ends of the support plate 8 along the second direction Y can also be supported on the box wall 201 of the box.

[0363] In some embodiments, the box 20 can comprise a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that an enclosed space is formed inside the box to accommodate the battery cell group. The frame comprises a beam member (not shown), at least one end of the support plate 8 is supported on the beam member, further, both ends of the support plate 8 along the first direction X and / or the second direction Y are supported on the beam member.

[0364] As an example, the box can be part of the chassis structure of a vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0365] In this way, the pressure borne by the lower layer of battery cells can be dispersed by the support plate 8 supported on the box wall 201 or the beam member, the stacking stability along the gravity direction Z can be improved, the number of stacking layers along the gravity direction Z can be increased, and the volume utilization and energy of the battery device can be improved.

[0366] In some embodiments, as shown in Figures 11 to 14 、 Figure 16 、 Figure 17 、 Figure 10 The battery device 100 further comprises a heat exchange plate (not shown), which is located between the battery cells 10 adjacent along the second direction Y, the battery cells 10 adjacent along the second direction Y abut each other through the heat exchange plate, and the plurality of battery cells 10 arranged along the first direction X abut the same heat exchange plate.

[0367] Within the same projection plane perpendicular to the second direction Y, the projection of the battery cell lies within the range of the projection of the heat exchange plate it contacts.

[0368] Therefore, not only can the stacking stability be improved through the support plate 8, but also the thermal management of individual battery cells can be carried out, thereby improving the reliability of the battery device.

[0369] In some embodiments, such as Figure 10 As shown, the thickness H1 of the support plate 8 is in the range of 2 mm to 7 mm; and / or, the thickness H1 of the support plate 8 is in the range of 3 mm to 6 mm.

[0370] by Figure 4 The following example illustrates the orientation. The thickness H1 of the support plate 8 refers to the distance between the upper surface and the lower surface of the support plate 8.

[0371] Optionally, the thickness H1 of the support plate 8 can be 2mm, 3mm, 4mm, 5mm, 6mm or 7mm, or other values ​​within the above range.

[0372] Therefore, the support plate 8 with a suitable thickness is beneficial to both improving stacking stability and volume utilization; moreover, it provides design space for designing the support plate 8 as a thermal management component.

[0373] In some embodiments, the support plate 8 includes thermal management components.

[0374] For example, the support plate 8 can be a liquid cooling plate.

[0375] Therefore, the support plate 8 can not only improve the stacking stability of the battery cells as mentioned above, but also perform thermal management on the battery cells, thereby improving the reliability of the battery device; moreover, no additional thermal management components are required, thus improving volume utilization.

[0376] In some embodiments, such as Figure 3 As shown, the outer casing 1 includes at least one of a steel casing, an aluminum casing, and a titanium alloy casing; and / or, in the outer casing 1, at least the hardness of the casing body is in the range of Vickers hardness HV10 to HV400.

[0377] Therefore, since steel shell 1, aluminum shell 1, and titanium alloy shell 1 can be used, welding can be easily carried out. Moreover, even if common shell 1 materials are used, multi-layer stacking along the gravity direction Z can be achieved, improving volume utilization. Since the shell wall of shell 1 is of a suitable thickness, both rigidity and volume utilization of shell 1 can be taken into account. Since shell 1 has suitable hardness, both rigidity, volume utilization, and ease of processing of shell 1 can be taken into account.

[0378] In some embodiments, such asFigure 2 As shown, the battery device 100 further includes a case 20, a plurality of battery cell groups 30 formed by the plurality of battery cells 10, each battery cell group 30 including a plurality of battery cells 10 stacked along the gravity direction Z, and each battery cell group accommodated in the case 20, the case 20 having a top plate and a bottom plate opposite along the gravity direction Z, and each battery cell group abutting at least one of the top plate and the bottom plate.

[0379] Each battery cell group 30 can abut the top plate or the bottom plate, or can abut both the top plate and the bottom plate.

[0380] Thus, the stacking stability of the battery cell group 30 can be improved; in the case where each battery cell group 30 abuts both the top plate and the bottom plate (directly or indirectly), the stacking stability of the battery cell group can be further improved, and the space utilization can be further improved.

[0381] In a second aspect, the embodiments of the present application further provide a power consumption device, which includes the battery device 100 provided by the first aspect of the embodiments of the present application, and the battery device is used to store electric energy and supply power to the power consumption device.

[0382] Since the battery device can improve the volume utilization as above, and stable support can be formed between the battery cells stacked along the gravity direction, the space occupied by the battery device in the power consumption device can be reduced, or the battery device installation space in the power consumption device can be fully utilized, the energy of the battery device can be improved, and the endurance of the power consumption device can be improved.

[0383] In a third aspect, the embodiments of the present application further provide an energy storage device 2000, which includes the battery device 100 provided by the first aspect of the embodiments of the present application, and the battery device is used to store electric energy and supply electric energy.

[0384] Figure 4 The structural schematic diagram of the energy storage device 2000 provided by some embodiments of the present application is shown. The energy storage device 2000 includes one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device.

[0385] Since the battery device can improve the volume utilization as above, the volume of the energy storage device can be reduced, or the storage energy of the energy storage device can be improved.

[0386] In a fourth aspect, as Figures 3 to 17As shown, the battery cell 10 according to the embodiments of the present application further includes: a housing 1 including a shell main body 15 and a first shell wall 11 connected to the shell main body 15, the first shell wall 11 being located at at least one side end of the shell main body 15 along a third direction Z, the wall thickness of the first shell wall 11 being greater than the wall thickness of the shell wall of the shell main body 15, the third direction Z being consistent with the direction of gravity in the use state of the battery cell 10.

[0387] In this way, the strength and rigidity of the first shell wall 11 can be improved, and the battery cells can be stacked in multiple layers along the direction of gravity Z.

[0388] In some embodiments, the battery cell 10 further includes an electrode assembly 6 and an electrode terminal 2, the housing 1 has a receiving space, the electrode assembly 6 is received in the receiving space, the first shell wall 11 is formed with a protruding portion 112, the protruding portion 112 protrudes in a direction away from the electrode assembly 6 along the third direction Z; the electrode terminal 2 is arranged on the first shell wall 11 and located at a position of the first shell wall 11 where the protruding portion 112 is not formed.

[0389] Since the first shell wall 11 is formed with the protruding portion 112, the strength and rigidity of the first shell wall 11 can be improved, so that the support stability of the adjacent battery cell along the direction of gravity Z can be improved, which is beneficial for stacking multiple battery cells along the direction of gravity. Moreover, since the electrode terminal 2 is arranged on the first shell wall 11 and located at a position of the first shell wall where the protruding portion is not formed, the miniaturization degree of the battery cell can be improved.

[0390] In some embodiments, the wall thickness of the shell wall of the shell main body 15 is in the range of 0.1 mm to 2.0 mm, and the wall thickness H3 of the first shell wall 11 is in the range of 0.8 mm to 3.0 mm.

[0391] Since the shell wall of the shell main body is at a suitable thickness, the rigidity and volume utilization of the housing can be considered; since the first shell wall is at a suitable thickness, the rigidity and strength of the first shell wall can be considered, and the multi-layer stacking along the direction of gravity can be achieved, and the volume utilization can be improved.

[0392] Next, a specific example of the embodiments of the present application will be described.

[0393] In a specific embodiment, as shown, Figure 4 The battery cell 10 is stacked in the box 20, the stacking direction is the height direction of the battery cell, and the pressure relief member 3 is located at the side of the battery cell 10, so that the occupied space of the battery cell group 30 along the direction of gravity Z can be reduced, and the space utilization of the battery device can be improved.

[0394] In some embodiments, for single-layer battery cell 10, the battery cell 10 can be in close contact with the top plate of the box 20; for multi-layer battery cell 10, the shoulder of the first shell wall 11 of the battery cell 10 is in close contact with the bottom of the battery cell 10 of the layer above it, and the battery cell 10 bears the pressure, thereby enhancing the rigidity of the battery device.

[0395] In some embodiments, as shown in FIG. 1, the first shell wall 11 is concave in the middle (forming protrusions on both sides), and the electrode terminal is located in the groove, so that the highest point of the battery cell 10 is the part of the top cover, which can withstand a certain pressure. ​

[0396] In some embodiments, along the gravity direction Z, the electrode terminal 2 does not exceed the protrusion 112, so that the highest point of the battery cell 10 is the part of the top cover, which can withstand a certain pressure.

[0397] In some embodiments, the battery cells are stacked along the gravity direction Z, and the pressure relief component is located on the side of the battery cell, so that there is no exhaust gap in the height direction of the battery cell.

[0398] In some embodiments, along the first direction X, the length L6 of the electrode assembly 6 is greater than 90% and less than 100% of the distance L7 between the opposite wall surfaces of the two second shell walls 12; along the second direction Y, the width of the electrode assembly 6 is greater than 90% and less than 100% of the distance between the opposite wall surfaces of the two third shell walls 13; along the gravity direction Z, the height of the electrode assembly 6 is greater than 80% and less than 100% of the distance between the opposite wall surfaces of the protrusion 112 of the first shell wall 11 and the fourth shell wall 14, so that the electrode assembly 6 can provide support force together with the first shell wall 11, reduce the probability of bending deformation of the first shell wall 11, and further improve the rigidity of the entire battery device.

[0399] In some embodiments, the shell can be made of steel, aluminum, titanium, etc., which is convenient for welding.

[0400] In some embodiments, the thickness of the shell body 15 is in the range of 0.1mm to 0.8mm, which can meet the rigidity requirement and improve the space utilization.

[0401] ​In some embodiments, the Vickers hardness of the shell is in the range of HV10~400, which can meet the rigidity requirement and is beneficial to the molding of the shell. The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized by, comprise at least two battery cells, each of the battery cells comprises: a housing including a housing main body and a first housing wall connected to the housing main body, the first housing wall being located at at least one side end of the housing main body in a gravity direction, the first housing wall having a wall thickness greater than a wall thickness of a housing wall of the housing main body, the housing having a receiving space; an electrode assembly accommodated in the receiving space; in the gravity direction, the at least two battery cells are stacked, and the first housing wall abuts against an adjacent battery cell.

2. The battery device according to claim 1, wherein the first housing wall is formed with a protrusion portion, and in the gravity direction, the protrusion portion abuts against the adjacent battery cell; each of the battery cells further comprises an electrode terminal provided at the first housing wall and located at a position of the first housing wall where the protrusion portion is not formed.

3. The battery device according to claim 2, wherein the wall thickness of the housing wall of the housing main body is in a range of 0.1 mm to 2.0 mm, and the wall thickness of the first housing wall is in a range of 0.8 mm to 3.0 mm.

4. The battery device according to claim 3, wherein the wall thickness of the first housing wall is in a range of 1.5 mm to 2.5 mm.

5. The battery device according to claim 3, wherein a plurality of the battery cells form a plurality of battery cell groups, each of the battery cell groups including n battery cells stacked in the gravity direction, n being a natural number equal to or greater than 2 and equal to or less than 10.

6. The battery device according to claim 5, wherein n is 2, and the wall thickness of the first housing wall is in a range of 0.8 mm to 1.0 mm.

7. The battery device according to claim 5, wherein n is 2 or 3, and the wall thickness of the first housing wall is in a range of 1.0 mm to 2.0 mm.

8. The battery device according to claim 5, wherein n is 2 or 3 or 4, and the wall thickness of the first housing wall is in a range of 1.5 mm to 2.5 mm.

9. The battery device according to claim 5, wherein n is equal to or greater than 5 and equal to or less than 10, and the wall thickness of the first housing wall is in a range of 1.5 mm to 3.0 mm.

10. The battery device according to any one of claims 1 to 9, wherein the housing main body includes two second housing walls disposed opposite to each other in a first direction, the first direction being perpendicular to the gravity direction and coinciding with a length direction of the battery cells, in the first direction, a ratio of a length of the electrode assembly to a distance between opposite wall surfaces of the two second housing walls is greater than 90% and less than 100%.

11. The battery device according to claim 10, wherein the housing main body further includes two third housing walls disposed opposite to each other in a second direction, the second direction being perpendicular to the gravity direction and the first direction, in the second direction, a ratio of a width of the electrode assembly to a distance between opposite wall surfaces of the two third housing walls is greater than 90% and less than 100%.

12. The battery device according to claim 2, wherein the first housing wall is located at a side end of the housing main body in a direction of gravity, the housing main body includes a fourth housing wall disposed opposite to the first housing wall in the direction of gravity, a ratio of a height of the electrode assembly with respect to a distance between the protruding portion in the first housing wall and an opposite wall surface of the fourth housing wall in the direction of gravity is greater than 80% and less than 100%.

13. The battery device according to any one of claims 2 to 9, wherein a length of the first housing wall in a first direction perpendicular to the direction of gravity and coinciding with a length direction of the battery cell is in a range of 120 mm to 1200 mm.

14. The battery device according to claim 13, wherein the length of the first housing wall in the first direction is in a range of 120 mm to 600 mm.

15. The battery device according to claim 13, wherein the length of the first housing wall in the first direction is in a range of 150 mm to 400 mm.

16. The battery device according to claim 13, wherein the first housing wall is formed with a protruding portion abutting against an adjacent battery cell in the direction of gravity, a ratio of a length of the protruding portion in the first direction with respect to a length of the first housing wall in the first direction is in a range of 50% or more and 98% or less.

17. The battery device according to claim 13, wherein a width of the first housing wall in a second direction is in a range of 12 mm to 90 mm, wherein the first direction, the second direction, and the direction of gravity are perpendicular to each other.

18. The battery device according to claim 17, wherein the width of the first housing wall in the second direction is in a range of 25 mm to 45 mm.

19. The battery device according to any one of claims 1 to 9, wherein a maximum height of the battery cell in the direction of gravity is in a range of 80 mm to 250 mm.

20. The battery device according to claim 19, wherein the maximum height of the battery cell in the direction of gravity is in a range of 100 mm to 200 mm.

21. The battery device according to any one of claims 1 to 9, wherein the housing main body includes two second housing walls disposed opposite to each other in a first direction perpendicular to the direction of gravity and coinciding with a length direction of the battery cell, the battery cell further includes a pressure relief member provided to at least one of the second housing walls.

22. The battery device according to claim 21, wherein the housing main body further includes two third housing walls disposed opposite to each other in a second direction, and an area of the first housing wall and an area of the second housing wall are smaller than an area of the third housing wall.

23. The battery device according to claim 21, wherein a plurality of the battery cells form a plurality of battery cell groups, each of the battery cell groups including a plurality of the battery cells stacked in the direction of gravity, The plurality of battery cell groups includes a first battery cell group and a second battery cell group, The first battery cell group and the second battery cell group are arranged in a first direction at intervals in the first direction, and at least some of the battery cells in the first battery cell group and / or at least some of the battery cells in the second battery cell group are arranged such that the pressure relief components of each of the battery cells face the intervals.

24. The battery device according to claim 23, wherein The first battery cell group and the second battery cell group are arranged such that the pressure relief components of each of the battery cells in the first battery cell group and the pressure relief components of each of the battery cells in the second battery cell group both face the intervals.

25. The battery device according to claim 24, wherein The pressure relief components of each of the battery cells in the first battery cell group and the pressure relief components of each of the battery cells in the second battery cell group are arranged offset in a gravitational direction, and In the same projection plane perpendicular to the first direction, the projection of the pressure relief components of each of the battery cells in the first battery cell group and the projection of the pressure relief components of each of the battery cells in the second battery cell group do not overlap.

26. The battery device according to claim 24, wherein The plurality of battery cell groups includes a third battery cell group, the pressure relief components of each of the battery cells of the third battery cell group face in the same direction in the first direction as the pressure relief components of each of the battery cells of the first battery cell group, and the second battery cell group is positioned between the first battery cell group and the third battery cell group in the first direction.

27. The battery device according to claim 21, wherein The plurality of battery cell groups includes a second battery cell group and a third battery cell group, The second battery cell group and the third battery cell group are arranged in a first direction, and the pressure relief components of each of the battery cells in the third battery cell group face in the first direction away from the second battery cell group, and the pressure relief components of each of the battery cells in the second battery cell group face in the first direction away from the third battery cell group.

28. The battery device according to any one of claims 1 to 9, wherein The first housing wall is positioned at one end of the housing body in a gravitational direction, The housing body includes a fourth housing wall positioned opposite the first housing wall in the gravitational direction, The plurality of battery cell groups includes a second battery cell group and a third battery cell group, In the same battery cell group, the first housing wall of one of the adjacent battery cells positioned below in the gravitational direction abuts the fourth housing wall of the other battery cell positioned above; or In the same battery cell group, the first housing wall of one of the adjacent battery cells positioned above in the gravitational direction abuts the fourth housing wall of the other battery cell positioned below.

29. The battery device of claim 23, wherein: the plurality of cell groups comprises a plurality of first cell groups and a plurality of second cell groups, the plurality of first cell groups and the plurality of second cell groups are arranged along a second direction, and each of the first cell groups and each of the second cell groups are oppositely arranged along a first direction with a spacing along the first direction, the spacing being continuous along the second direction to form a first channel, a pressure relief component of each cell in the first cell groups and a pressure relief component of each cell in the second cell groups are both directed toward and continuous with the first channel along the first direction.

30. The battery device of claim 29, wherein: the first channel comprises a first passage and a second passage, the first passage and the second passage being separated by a partition along the first direction.

31. The battery device of claim 29, wherein: the plurality of cell groups further comprises a plurality of third cell groups, the plurality of third cell groups being arranged along the second direction, and along the first direction, the second cell groups being located between the first cell groups and the third cell groups, along the first direction, the first channel is formed on a side of the second cell groups proximate to the first cell groups, and a second channel is formed on a side of the third cell groups distal to the second cell groups, a pressure relief component of each cell in the first cell groups and a pressure relief component of each cell in the second cell groups are both directed toward and continuous with the first channel along the first direction, and a pressure relief component of each cell in the third cell groups is directed toward and continuous with the second channel along the first direction.

32. The battery device of claim 29, wherein: each of the cells further comprises an electrode terminal, the electrode terminal being disposed on the first housing wall, the electrode terminal comprising a first electrode terminal plate and a second electrode terminal plate, the first electrode terminal plate and the second electrode terminal plate being located on a side of the first housing wall distal to the electrode assembly along a direction of gravity, a projection of the first electrode terminal plate and a projection of the second electrode terminal plate at least partially overlap in a same projection plane perpendicular to the second direction.

33. The battery device of claim 32, wherein: the first electrode terminal plate and the second electrode terminal plate of each of the cells at a same level along the direction of gravity are alternately disposed along the second direction, the first electrode terminal plate and the second electrode terminal plate having opposite polarities, the battery device further comprises a busbar, adjacent ones of the first electrode terminal plate and the second electrode terminal plate in two adjacent ones of the cells along the second direction are connected by the busbar.

34. The battery device of claim 33, wherein: The first housing wall is formed with a protrusion, and the electrode terminal is located at a position in the first housing wall where the protrusion is not formed, and the protrusion abuts against an adjacent battery cell in a direction of gravity; In the direction of gravity, the busbar does not protrude beyond the protrusion on a side of the protrusion that protrudes.

35. The battery device according to any one of claims 1 to 9, wherein The battery device includes a plurality of battery cell layers in the direction of gravity, each of the battery cell layers is stacked in the direction of gravity, and each battery cell layer includes a plurality of battery cells, The battery device further includes a plurality of support plates, the support plates are located between adjacent battery cell layers in the direction of gravity, and the adjacent battery cell layers abut against each other via the support plates.

36. The battery device according to claim 35, wherein In the same battery cell layer, some or all of the battery cells arranged in the first direction abut against the same support plate; and / or In the same battery cell layer, some or all of the battery cells arranged in the second direction abut against the same support plate; and / or The support plate is configured to be at least partially insulated; and / or In the direction of gravity, at least one side of the battery cell is bonded to the support plate.

37. The battery device according to claim 35, wherein The battery device further includes a case, and at least one end of the support plate is supported by a case wall of the case; and / or The battery device further includes a case and a beam member provided in the case, and at least one end of the support plate is supported by the beam member.

38. The battery device according to claim 35, wherein The support plate includes a thermal management component.

39. An electrical device, comprising: The power consuming device includes the battery device according to any one of claims 1 to 38, and the battery device is configured to store electrical energy and supply power to the power consuming device.

40. An energy storage device, comprising: The energy storage device includes the battery device according to any one of claims 1 to 38, and the battery device is configured to store electrical energy and supply electrical energy.

41. A battery cell, characterized by Comprise: A housing having a receiving space, and an electrode assembly received in the receiving space, the housing including a housing main body and a first housing wall connected to the housing main body, the first housing wall being located at at least one side end of the housing main body in a third direction, the first housing wall having a wall thickness greater than a wall thickness of a housing wall of the housing main body, and the third direction being consistent with a direction of gravity in a use state of the battery cell.

42. The battery cell according to claim 41, wherein The battery cell further includes an electrode terminal, The first housing wall is formed with a protrusion, and the protrusion protrudes in the third direction away from the electrode assembly; The electrode terminal is provided at the first housing wall and at a position in the first housing wall where the protrusion is not formed.

43. The battery cell according to claim 41, wherein The wall thickness of the housing wall of the housing main body is in a range of 0.1 mm to 2.0 mm, and The wall thickness of the first housing wall is in a range of 0.8 mm to 3.0 mm.

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